JP2006246670A - Method of controlling printer and printer motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printer which can compute an appropriate pause time having reflected the actual internal temperature of a motor. <P>SOLUTION: The printer, which performs printing on the object of printing, is equipped with a CPU23 which serves as a load detection means for detecting the motor load of the CR motor 4, and a motor stopping means which computes the pause time from the motor load detected with the CPU23 and pauses the CR motor 4 in the process of printing to the object of printing. The motor stopping means is composed of a main driving circuit 22, the CPU23, and a memory such as a ROM24 or the like. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a printer and a method for controlling a printer motor.

  2. Description of the Related Art Conventionally, ink jet printers are equipped with a motor such as a carriage motor that drives a carriage having a print head and a paper feed motor that feeds printing paper or the like to be printed. Since these motors are frequently started and stopped for driving the carriage, feeding the paper, and the like, heat generated according to the power consumption when being driven is accumulated and is likely to be overheated. When the motor becomes overheated, problems such as burning of the winding coil, smoke generation or ignition occur. Therefore, in a printer equipped with these motors, in order to prevent overheating of the motor, motor pause control is performed in which the motor is paused for a predetermined time in the printing process on the print target (for example, Patent Documents). 1 to 3).

  In the printer described in Patent Document 1, the motor pause control of the carriage motor is performed as follows. First, a heat generation table in which a unit heat generation amount generated in the carriage motor in a one-pass conveyance process in which the carriage crosses the print target once is prepared in advance according to the carriage conveyance speed and the carriage conveyance time is prepared in advance. Has been. Each calorific value set in the heat generation table includes the reference current calculated in a preliminary experiment in which the conveyance speed and the conveyance time are variously changed while changing the carriage conveyance speed and the conveyance time, and the carriage conveyance speed. And a transport time for one pass calculated according to the transport distance and a predetermined calculation formula.

  When printing an object to be printed, the unit calorific value of the carriage motor for each printing operation of one pass is read from the heat generation table, the unit calorific value is integrated, and the heat dissipation amount corresponding to the carriage stop time is subtracted from the integrated value. Thus, the heat storage amount of the carriage motor is obtained. When the heat storage amount exceeds a specified value, the carriage motor is stopped for a predetermined time before the next one-pass printing operation. The rest time of the carriage motor is set on one rest time table prepared in advance according to the moving speed and the moving time of the carriage. Each pause time set on the pause time table is calculated in a preliminary experiment according to the amount of heat stored in the carriage motor. When the heat storage amount exceeds the specified value, a pause time corresponding to the unit heat generation amount of the carriage motor in the next one-pass printing operation is selected from the pause time table, and the carriage motor is paused during the pause time. ing.

  Further, in the printers described in Patent Documents 2 and 3, the motor internal temperature of the carriage motor is estimated from the heat storage amount calculated by the same method as the printer described in Patent Document 1. When the estimated motor internal temperature exceeds the specified temperature, the carriage motor is stopped for a predetermined time between the passes. As with the printer described in Patent Document 1, the carriage motor pause time is calculated in a preliminary experiment according to the amount of heat stored in the carriage motor and set on the pause time table. In the printers described in Patent Documents 2 and 3, as in the printer described in Patent Document 1, when the internal temperature of the motor exceeds a specified temperature, the carriage motor in the next one-pass printing operation is performed. A pause time corresponding to the unit calorific value is selected from the pause time table, and the carriage motor is paused during the pause time.

  In the printers described in Patent Documents 2 and 3, three specified temperatures from the first specified temperature to the third specified temperature are set as the specified temperatures. Then, two rest time tables are prepared: a rest time table that is applied when the internal temperature of the carriage motor exceeds the first specified temperature, and a rest table that is applied when the second specified temperature is exceeded. Yes. That is, even when the unit heat generation amount of the carriage motor in the next one-pass printing operation is the same, different pause times are selected depending on the internal temperature of the carriage motor. Further, the pause time when the internal temperature of the carriage motor exceeds the third specified temperature is a fixed time. As described above, in the printers described in Patent Documents 2 and 3, by setting three specified temperatures, the estimated internal temperature of the motor (that is, the amount of heat stored in the carriage motor) is taken into consideration in stages. You can select the time.

JP 2003-79186 A JP 2003-79178 A JP 2003-79179 A

  As described above, the motor pause control for the carriage motor or the like is performed in order to prevent the winding coil from being burned out by preventing the motor from overheating. However, in the printers described in Patent Documents 1 to 3, a pause time corresponding to a unit calorific value calculated based on a reference current or the like previously calculated in a preliminary experiment is selected from the pause time table. That is, the unit calorific value is an estimated value obtained from an experiment to the last, and the pause time corresponding to the unit calorific value is also an estimated value. Therefore, the pause time in the motor pause control does not reflect the actual heat storage amount or internal temperature of the motor. Therefore, if a large error occurs between the pause time required from the actual heat storage amount or the internal temperature of the motor and the pause time selected corresponding to the estimated unit heating value, the winding coil burns out, etc. Cannot be reliably prevented. In particular, when the motor is overheated due to unexpected load fluctuations of the motor, it is impossible to prevent the winding coil from being burned out.

  In order to avoid such a risk, that is, in order to prevent the motor from being overheated even if an error occurs between the selected pause time and the pause time required from the actual heat storage amount or the motor internal temperature, In general, a long pause time considering an error is set on the pause time table. Therefore, the motor may be stopped for a long time that is not actually required, and the motor stop time becomes longer than necessary. As a result, there is a problem that the printing time for the printing object becomes long and the printing time does not satisfy the specification value. Further, there may be a problem that the carriage is paused for a long time and the user feels uncomfortable.

  In addition, in the printers described in Patent Documents 1 to 3, since a pause time table in which a pause time corresponding to the amount of heat stored in the carriage motor is calculated in advance in a preliminary experiment must be prepared, the burden on the development stage becomes heavy. In particular, like the printers described in Patent Documents 2 and 3, two pause times tables must be prepared so that pause times can be selected in stages in consideration of the estimated motor internal temperature. If this is not the case, the burden for preparing the downtime table becomes even heavier.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a printer and a printer motor control method capable of calculating an appropriate pause time reflecting the actual internal motor temperature.

  In order to solve the above problems, the present invention provides a printer that performs printing while feeding an object to be printed, a load detection unit that detects a motor load of a mounted motor, and a pause from the motor load detected by the load detection unit. Motor stop means for calculating time and stopping the motor for the stop time in the process of printing on the printing object is provided.

  The printer of the present invention includes load detection means for detecting the motor load of the mounted motor. Therefore, the actual motor internal temperature can be grasped by detecting the motor load having a correlation with the motor internal temperature. That is, the motor load varies with the variation of the motor internal temperature. For example, if the motor internal temperature rises, the motor load increases, and if the motor internal temperature decreases, the motor load decreases. Therefore, the motor internal temperature can be grasped by detecting the motor load. Further, the downtime is calculated from the motor load detected by the load detecting means. Therefore, it is possible to calculate an appropriate pause time that reflects the actual motor internal temperature. As a result, it is possible to reliably prevent overheating of the motor and to prevent the winding coil from being burned out.

  In the present invention, the motor is preferably controlled by a PWM control method, and the load detection means preferably detects the duty value of the PWM drive signal supplied to the motor. When the motor is controlled by the PWM control method, the motor load is directly reflected in the duty value of the PWM drive signal. Therefore, by detecting the duty value of the PWM drive signal, it is possible to appropriately detect the motor load having a correlation with the motor internal temperature.

  In the present invention, it is preferable that the load detecting means detects an average value of duty values in a constant speed region where the motor is conveyed at a constant speed. As described above, when the duty value in the constant speed region is detected, the duty value can be easily detected as compared with the case where the duty value in the acceleration / deceleration region of the motor is calculated. Further, when the average value of the duty values is detected, the influence of disturbance can be eliminated, and an appropriate duty value can be detected.

  In the present invention, the pause time calculated by the motor pause means preferably increases or decreases exponentially with respect to the increase or decrease of the motor load detected by the load detection means. As the temperature around the motor rises as the heat is radiated from the inside of the motor, the amount of heat radiated from the motor per unit time decreases with time. Therefore, a more appropriate pause time can be obtained by calculating a pause time that increases and decreases exponentially with respect to the increase and decrease of the motor load. In addition, since the pause time increases and decreases exponentially, the pause time can be calculated seamlessly, and the pause time corresponding to the fluctuation can be calculated even if the fluctuation of the internal temperature of the motor is slight. . Therefore, it is possible to calculate the downtime more appropriately reflecting the motor internal temperature.

  In order to solve the above problems, the present invention is a printer that performs printing while feeding an object to be printed, and is detected by a motor temperature detecting unit that detects a motor internal temperature of a mounted motor, and a motor temperature detecting unit. Motor pause means for calculating a pause time from the internal temperature of the motor and stopping the motor for the pause time in the printing process on the printing object.

  The printer of the present invention includes motor temperature detection means for detecting the motor internal temperature of the mounted motor, and calculates the pause time from the motor internal temperature detected by the motor temperature detection means. Therefore, it is possible to calculate an appropriate pause time that reflects the actual motor internal temperature. As a result, it is possible to reliably prevent overheating of the motor and to prevent the winding coil from being burned out.

  In the present invention, the pause time calculated by the motor pause means preferably increases or decreases exponentially with respect to the increase or decrease of the motor internal temperature detected by the motor temperature detection means. As the temperature around the motor rises as the heat is radiated from the inside of the motor, the amount of heat radiated from the motor per unit time decreases with time. Therefore, a more appropriate pause time can be obtained by calculating a pause time that increases and decreases exponentially with respect to the increase and decrease of the motor internal temperature. In addition, since the pause time increases and decreases exponentially, the pause time can be calculated seamlessly, and the pause time corresponding to the fluctuation can be calculated even if the fluctuation of the internal temperature of the motor is slight. . Therefore, it is possible to calculate the downtime more appropriately reflecting the motor internal temperature.

  Furthermore, in order to solve the above-described problems, the present invention performs motor pause control that pauses a motor for a predetermined pause time in a printing process on a print object in order to prevent overheating of a motor mounted on the printer. In the printer motor control method, the motor load of the motor is detected, and the motor pause time is calculated from the motor load.

  In the printer motor control method of the present invention, the motor load of the motor mounted on the printer is detected, and the motor pause time is calculated from the motor load. By detecting the motor load having a correlation with the motor internal temperature, the actual motor internal temperature can be grasped. Further, by calculating the rest time from the motor load detected by the load detecting means, it is possible to calculate an appropriate rest time reflecting the actual motor internal temperature. As a result, it is possible to reliably prevent overheating of the motor and to prevent the winding coil from being burned out.

  In the present invention, the initial motor load of the motor is detected in the initial operation when the printer is turned on, and the motor load is a subtraction value obtained by subtracting the initial motor load from the print motor load during the printer printing operation. Is preferred. For example, in the case of an ink jet printer, the amount of ink in an ink cartridge mounted on a carriage is consumed every time printing is performed. Therefore, the weight of the carriage decreases every time printing is performed. Since the mechanical state fluctuates with time due to such a change in carriage weight, the conveyance load of the carriage changes with time. As a result, when calculating the downtime from the motor load, it may not be possible to calculate the downtime that appropriately reflects the internal temperature of the motor. Here, if the motor load is calculated by subtracting the initial motor load detected in the initial operation when the printer power is turned on from the print motor load during the printer printing operation, the motor with less influence of the mechanical state over time The load can be calculated. That is, it is possible to calculate the motor load that more appropriately reflects the fluctuation of the internal temperature of the motor between the initial operation and the printing operation. Therefore, by setting the subtraction value as the motor load, the internal temperature of the motor can be grasped more appropriately, and a more appropriate pause time can be calculated.

  Further, in order to solve the above-described problems, the present invention performs motor pause control that pauses a motor for a predetermined pause time in a printing process on a print object in order to prevent overheating of a motor mounted on the printer. In the printer motor control method, the motor internal temperature of the motor is detected, and the motor pause time is calculated from the motor internal temperature.

  In the control of the printer motor according to the present invention, the internal temperature of the motor mounted on the printer is detected, and the downtime is calculated from the internal temperature of the motor. Therefore, it is possible to calculate an appropriate pause time that reflects the actual motor internal temperature. As a result, it is possible to reliably prevent overheating of the motor and to prevent the winding coil from being burned out.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

[Embodiment 1]
(Schematic configuration of the printer)
FIG. 1 is a schematic perspective view showing a configuration of a main part of a printer 1 according to an embodiment of the present invention. FIG. 2 is a block diagram mainly illustrating the configuration of the control unit 21 of the printer 1 according to the first embodiment of the present invention.

  The printer 1 of this embodiment is an ink jet printer that performs printing by ejecting ink onto a printing paper P or the like that is a printing target. As shown in FIGS. 1 and 2, the printer 1 includes a carriage 3 on which a print head 2 that ejects ink droplets is mounted, a carriage motor (CR motor) 4 that drives the carriage 3 in the main scanning direction MS, A paper feed motor (PF motor) 5 for feeding the printing paper P in the sub-scanning direction SS, a PF drive roller 6 connected to the PF motor 5 directly or via a gear not shown, and a nozzle surface of the print head 2 ( And a platen 7 arranged to face the lower surface in FIG. The printer 1 of this embodiment is equipped with a direct current (DC) motor as the CR motor 4 and the PF motor 5.

  The carriage 3 is configured to be transportable in the main scanning direction MS by a guide shaft 9 supported by a support frame 8 and a timing belt 10. That is, a part of the timing belt 10 is fixed to the carriage 3 and is engaged with a pulley 11 attached to the output shaft of the CR motor 4 and a pulley 12 rotatably attached to the support frame 8. They are arranged to have a certain tension. The guide shaft 9 slidably holds the carriage 3 so as to guide the carriage 3 in the main scanning direction MS.

  In addition to the print head 2, the carriage 3 includes a black ink cartridge 13 that stores black ink supplied to the print head 2 and a color ink cartridge 14 that stores color ink supplied to the print head 2. Has been. The carriage 3 is attached with one end of a flexible printed board 15 that electrically connects the print head 2 and a control board (not shown).

  On the home position side (right end side in FIG. 1) of the carriage 3 in the support frame 8, a capping device 16 for sealing the nozzle surface of the print head 2 to prevent ink drying is provided. When the carriage 3 finishes printing on the printing paper P and reaches the home position, the capping device 16 is raised by an elevating mechanism (not shown) to seal the nozzle surface of the print head 2.

  Further, as shown in FIG. 2, the printer 1 includes a linear encoder 17 for detecting the rotational position of the CR motor 4 and the rotational speed of the CR motor 4 in the main scanning direction MS, and the printing paper P in the sub-scanning direction SS. And a rotary encoder 18 for detecting the position and speed. The linear encoder 17 includes a linear linear scale 19 attached to the support frame 8 in parallel with the main scanning direction, and a photosensor 20 attached to the carriage 3. The rotary encoder 18 is attached to the rotor of the PF motor 5 or one gear in the gear train connected to the rotor.

(Configuration of printer control unit)
As shown in FIG. 2, the control unit 21 of the printer 1 includes a main control circuit 22, a CPU 23, a ROM 24, a RAM 25, and an EEPROM 26. Various memories (ROM 24, RAM 25, and EEPROM 26) are buses. 27 is connected to the main control circuit 22 and the CPU 23. The control unit 21 includes an interface circuit 29 that transmits and receives signals to and from an external device such as a personal computer, a CR motor driving circuit 30, a head driving circuit 31, and a PF motor driving circuit 32. These circuits are connected to the main control circuit 22.

  The CR motor drive circuit 30 is configured to drive the CR motor 4 by supplying a PWM drive signal to the CR motor 4 by a PWM (Pulse Width Modulation) control method. The detailed configuration of the CR motor drive circuit 30 will be described later. The head drive circuit 31 is configured to drive nozzles (not shown) of the print head 2, and the nozzles driven by the head drive circuit 31 eject ink droplets toward the printing paper P. ing. The PF motor drive circuit 32 is configured to drive the PF motor 5 by supplying a PWM drive signal to the PF motor 5 by the PWM control method similar to that of the CR motor drive circuit 30.

  The main control circuit 22 has a function of supplying a control signal to each of the three drive circuits of the CR motor drive circuit 30, the head drive circuit 31, and the PF motor drive circuit 32. In addition, the interface circuit 29 has a function of decoding various print commands received and performing control related to adjustment of print data. Further, as shown in FIG. 2, the main control circuit 22 is configured to receive output signals from the linear encoder 17 and the rotary encoder 18, and has a monitoring function for various sensors. The main control circuit 22 includes a CR motor control circuit 36 that constitutes a drive control device 35 described later.

  The CPU 23 has various functions for assisting the main control circuit 22. For example, the CPU 23 performs arithmetic processing for executing a control program for the printer 1 recorded in the ROM 24, the EEPROM 26, or the like. Yes.

(Configuration of CR motor drive control device)
FIG. 3 is a block diagram showing a configuration of the drive control device 35 of the CR motor 4. FIG. 4 is a graph showing the current rotation speed signal Vc and the target rotation speed signal Vt in the one-pass conveyance process of the carriage 3. FIG. 5 is a diagram illustrating an example of the PWM drive signal Sdr supplied to the CR motor 4.

  As shown in FIG. 3, the drive control device 35 for the CR motor 4 in this embodiment includes a CR motor drive circuit 30 and a CR motor control circuit 36 that constitutes a part of the main control circuit 22.

  The CR motor control circuit 36 includes a position calculator 37, a speed calculator 38, a position deviation generator 39, a target speed generator 40, a speed deviation generator 41 including a speed deviation generator, and a proportional element 42. , An integration element 43, a differentiation element 44, and an addition operation unit 45. In other words, in this embodiment, as a control method of the CR motor 4, PID control is adopted in which proportional control, integral control, and differential control are combined to control the current rotational speed of the CR motor 4 to converge to the target rotational speed. Yes.

  The position calculation unit 37 and the speed calculation unit 38 are configured to receive the output signal Sen of the linear encoder 17. The position calculation unit 37 outputs a current rotational position signal Pc indicating the current rotational position of the CR motor 4 according to the output signal Sen from the linear encoder 17. Further, the speed calculation unit 38 outputs a current rotation speed signal Vc indicating the current rotation speed of the CR motor 4 according to the output signal Sen from the linear encoder 17.

  The position deviation generator 39 is configured to receive a target rotational position signal Pt indicating a target rotational position recorded in a memory such as the ROM 24 and a current rotational position signal Pc. 39 is configured to output a position difference signal ΔP which is a difference between the input current rotational position signal Pc and the target rotational position signal Pt.

  The target speed generating unit 40 is configured to receive a position difference signal ΔP, and the target speed generating unit 40 is configured so that the CR motor 4 according to the current rotational position signal Pc and the input position difference signal ΔP. A target rotation speed signal Vt indicating the target rotation speed is output. More specifically, the target speed generation unit 40 includes an initial target rotational speed signal Vt indicating the current rotational position signal Pc, the position difference signal ΔP, a predetermined gain, and the target rotational speed of the CR motor 4 at the start of driving. (0) is used to output a target rotational speed signal Vt having a change pattern as shown by the solid line in FIG. That is, from the acceleration region between the position 0 to the position P1 where the CR motor 4 accelerates, the constant velocity region from the position P1 to the position P2 where the CR motor 4 rotates at a constant speed, and the position P2 where the CR motor 4 decelerates A target rotational speed signal Vt having a deceleration region up to the position P3 is output. In FIG. 4, the horizontal axis indicates the rotational position of the CR motor 4, and the vertical axis indicates the rotational speed of the CR motor 4. FIG. 4 is a solid line showing the change pattern of the target rotational speed signal Vt in the one-pass conveyance process in which the carriage 3 crosses once from the one end side to the other end side of the printing paper P in the main scanning direction MS. A change pattern of the rotation speed signal Vc is indicated by a broken line.

  In the present embodiment, the target speed generation unit 40 starts driving the CR motor 4 that is in a stopped state in the acceleration region, and the target rotational speed signal Vt until the CR motor 4 reaches a predetermined rotational position Pa. The initial target rotation speed signal Vt (0), which is a constant value, is output. By doing so, the CR motor 4 can be appropriately accelerated by PID control even in a region where the rotational speed immediately after the start of driving is anxious.

  The speed deviation generator 41 is configured to receive the target rotational speed signal Vt and the current rotational speed signal Vc. The speed deviation generator 41 receives the input target rotational speed signal Vt and the current rotational speed. A speed difference signal ΔV, which is a difference from the signal Vc, is output.

  The speed difference signal ΔV output from the speed deviation generator 41 is configured to be input to the proportional element 42, the integral element 43, and the derivative element 44. The proportional element 42, the integral element 43, and the derivative element 44 output a proportional control value QP, an integral control value QI, and a derivative control value QD that are calculated based on the input speed difference signal ΔV, respectively. It has become.

  The addition calculation unit 45 is configured to receive the proportional control value QP, the integral control value QI, and the differential control value QD output from the proportional element 42, the integral element 43, and the derivative element 44, respectively. The addition operation unit 45 adds these control values QP, QI, and QD and outputs a PID control value ΣQ.

  The CR motor drive circuit 30 includes a DC-DC converter 47 configured by a transistor bridge and a base drive unit 48 including a base drive circuit. As described above, in this embodiment, PWM control is adopted as a control method of the CR motor 4, and the PWM drive signal Sdr is supplied from the CR motor drive circuit 30 to the CR motor 4. .

  The base drive unit 48 is configured to receive a PID control value ΣQ, and the base drive unit 48 outputs a base signal corresponding to the input PID control value ΣQ to the DC-DC converter 47. It is supposed to be. The DC-DC converter 47 supplies the PWM drive signal Sdr to the CR motor 4 in accordance with the base signal output from the base drive unit 48 and input to the base of each transistor.

  More specifically, as shown in FIG. 5, the PWM drive signal Sdr is a pulse signal that applies a voltage to the CR motor 4 only during the voltage application time ton during the switching cycle tp. The voltage application time ton is adjusted according to the signal. Here, in this specification, this voltage application time ton is defined as a duty value, and is expressed as a duty value ton below. The drive control device 35 of the present embodiment is configured such that the duty value ton increases as the PID control value ΣQ input to the base drive unit 48 increases, that is, as the speed difference signal ΔV increases. Yes.

(Motor pause control of CR motor)
FIG. 6 is a flowchart of motor pause control according to the first embodiment of the present invention. FIG. 7 is a graph showing the relationship between the duty value of the CR motor 4 and the pause time in the motor pause control.

  In the printer 1 configured as described above, the CR motor 4 moves on the printing paper P in the main scanning direction MS while the PF driving roller 6 rotated by the PF motor 5 feeds the printing paper P in the sub-scanning direction SS. The carriage 3 is reciprocated and conveyed repeatedly. When the carriage 3 is reciprocated, ink droplets are ejected from the print head 2 and printing on the printing paper P is performed.

  The CR motor 4 performs the current rotational speed by PID control based on the speed difference signal ΔV between the target rotational speed signal Vt output from the target speed generator 40 and the current rotational speed signal Vc output from the speed calculator 38. The signal Vc is controlled to converge to the target rotation speed signal Vt. That is, the CR motor 4 is PID-controlled so that the change pattern of the current rotation speed signal Vc indicated by the broken line in FIG. 4 converges on the change pattern of the target rotation speed signal Vt indicated by the solid line in FIG.

  Here, the CR motor 4 frequently starts and stops to repeatedly reciprocate the carriage 3 on the printing paper P in the main scanning direction MS. Therefore, the CR motor 4 is likely to be overheated because heat generated according to the power consumption when driven is accumulated. When the CR motor 4 is in an overheated state, problems such as burning of the winding coil, smoke generation or ignition occur. Therefore, in this embodiment, in order to prevent the CR motor 4 from being overheated, motor pause control is performed in which the CR motor 4 is paused for a predetermined pause time during printing on the printing paper P or the like.

  In the motor pause control, the motor load of the CR motor 4 is detected, the pause time is calculated from the motor load, and the CR motor 4 is paused in the process of printing on the printing paper P or the like. In the motor pause control of this embodiment, first, the duty value ton of the PWM drive signal Sdr corresponding to the motor load is detected. Then, when the detected duty value ton exceeds the specified value, the CR motor continues until the carriage 3 finishes the one-pass printing operation of crossing the printing paper P once and performs the next one-pass printing operation. 4 is paused for a predetermined time.

  More specifically, as shown in FIG. 6, first, when a print command is input from the external device to the interface circuit 29, a pre-printing preparatory operation for carrying the carriage 3 one pass without driving the printing paper P is performed. In the preliminary operation, the duty value ton of the PWM drive signal Sdr supplied to the CR motor 4 is detected (step S10). More specifically, an average value tav0 of the duty value ton in the entire constant speed region from the position P1 to the position P2 shown in FIG. 5 is calculated. The average value tav0 is calculated by the CPU 23. That is, in this embodiment, the CPU 23 is a load detection unit that detects the motor load of the CR motor 4.

  When the preliminary operation ends, it is determined whether or not the average value tav0 during the preliminary operation is equal to or less than a specified value (step S11). Here, as the winding coil of the CR motor 4, one having a heat resistant temperature of 155 ° C. or 180 ° C. is generally used. In this embodiment, it is assumed that a winding coil having a heat resistant temperature of 180 ° C. is used, and the allowable temperature of the winding coil is 155 ° C. That is, in the motor pause control of this embodiment, the CR motor 4 is controlled so that the winding coil does not exceed the allowable temperature 155 ° C., for example, the motor internal temperature is 130 ° C. (this temperature is set as the specified temperature). If it exceeds, the CR motor 4 is stopped. Therefore, a specified duty value ton11 corresponding to the specified temperature is set as the specified value. The specified duty value ton11 is obtained in advance by preliminary experiments or calculations from the relationship between the motor internal temperature and the duty value.

  If the calculated average value tav0 exceeds the prescribed duty value ton11, the CR motor 4 is suspended for a predetermined pause time before the carriage 3 performs a one-pass printing operation (step S12). Here, the rest time of the CR motor 4 is calculated from the average value tav0 by a predetermined calculation formula. In this embodiment, as shown in FIG. 7, when the average value tav0 exceeds the specified duty value ton11, an exponential function having a parameter (tav0−ton11) obtained by subtracting the specified duty value ton11 from the average value tav0. Is used to calculate the rest time of the CR motor 4. In FIG. 7, for example, an allowable duty value ton12 corresponding to the allowable temperature 155 ° C. of the winding coil is set as the allowable value of the average value tav0 so that the average value tav0 does not exceed the allowable duty value ton12. The CR motor 4 is stopped. This allowable duty value ton12 is also obtained in advance by preliminary experiments or calculations from the relationship between the motor internal temperature and the duty value.

  Here, even if the amount of heat generated inside the CR motor 4 is constant, the duty value ton varies due to variations in the voltage applied to the DC-DC converter 47, variations in the transport load of the carriage 3, and the like. Therefore, when obtaining the prescribed duty value ton11, consideration is given so that an appropriate pause time is calculated even under the worst conditions. More specifically, when obtaining the prescribed ton 11 by calculation, for example, the torque of the CR motor 4 is the maximum of the standard value, the internal resistance of the CR motor 4 is the minimum of the standard value, and is applied to the DC-DC converter 47. A specified duty value ton11 is determined such that the internal temperature of the motor becomes the specified temperature T11 under the condition that the duty value ton is minimum such that the voltage is the maximum of the standard value and the transport load of the carriage 3 is the minimum of the standard value. . In this way, by obtaining the specified duty value ton11 corresponding to the specified temperature under the condition that the duty value ton is minimized, the rest time of the CR motor 4 calculated by an exponential function using (tav0−ton11) as a parameter Becomes a downtime appropriately reflecting the specified temperature even under the worst conditions. Similarly, the allowable duty value ton12 corresponding to the allowable temperature is obtained under the condition that the duty value is minimized as described above.

  When the average value tav0 is equal to or less than the specified duty value ton11, or after the CR motor 4 has been stopped for a predetermined pause time, the CR motor 4 causes the carriage 3 to perform a one-pass printing operation, and the printing operation is performed. The duty value ton of the PWM drive signal Sdr supplied to the CR motor 4 is detected (step S13). Also here, the average value tav of the duty value ton in the entire constant speed region from the position P1 to the position P2 shown in FIG. 4 is calculated.

  When the average value tav is calculated, it is determined whether or not there is data to be continuously printed, that is, whether or not there is print data (step S14). If there is print data, the process returns to step S11 to determine whether the average value tav is equal to or less than the specified duty value ton11. When the average value tav exceeds the specified duty value ton11, a value (tav−ton11) obtained by subtracting the specified duty value ton11 from the average value tav using the average value tav calculated in step S14 is used as a parameter. The rest time of the CR motor 4 is calculated by an exponential function. Then, the CR motor 4 is paused before the calculated pause time and the printing operation for the next one pass (step S12). When the average value tav is equal to or less than the specified duty value ton11, or after the CR motor 4 is suspended for a predetermined rest time, the next one-pass printing operation is performed (step S13). If it is determined in step S14 that there is no print data, the printing operation for the printing paper P or the like is terminated.

  Note that the determination in step S11 and the processing in step S12 are performed by a memory such as the main drive circuit 22, the CPU 23, and the ROM 24. In other words, the main drive circuit 22, the CPU 23, and the memory such as the ROM 24 constitute a motor pause means that pauses the CR motor 4 for a predetermined pause time in the process of printing on the printing paper P or the like.

(Main effects of this form)
As described above, the printer 1 of this embodiment varies with the variation of the motor internal temperature of the CR motor 4, that is, has a correlation with the motor internal temperature (that is, reflects the motor internal temperature). The motor load is detected. Therefore, the actual motor internal temperature of the CR motor 4 can be grasped indirectly. Further, the rest time of the CR motor 4 is calculated from the motor load. Therefore, it is possible to calculate an appropriate pause time that reflects the actual motor internal temperature. As a result, it is possible to reliably prevent overheating of the motor and to prevent the winding coil from being burned out.

  In this embodiment, the CR motor 4 is controlled by the PWM control method, and detects the duty value ton of the PWM drive signal Sdr supplied to the CR motor 4 as the motor load. When the CR motor 4 is controlled by the PWM control method, the motor load is directly reflected in the duty value ton of the PWM drive signal Sdr. Therefore, by detecting the duty value ton of the PWM drive signal Sdr, it is possible to appropriately detect the motor load having a correlation with the motor internal temperature.

  In particular, in this embodiment, the average value tav of the duty value ton in the constant speed region where the CR motor 4 is conveyed at a constant speed is detected as the motor load. Since the duty value ton in the constant speed region is detected, it is easier to detect the duty value ton compared to the case where the duty value ton in the acceleration / deceleration region of the CR motor 4 is calculated. Further, since the average value tav of the duty value ton is detected, the influence of disturbance can be eliminated, and an appropriate motor load can be detected.

  In this embodiment, the resting time of the CR motor 4 is calculated by an exponential function using a value (tav−ton11) obtained by subtracting the specified duty value ton11 from the average value tav (or tav0) as a parameter. That is, the rest time of the CR motor 4 increases and decreases exponentially with respect to the increase and decrease of the average value tav. As the temperature around the CR motor 4 rises as heat is radiated from inside the CR motor 4, the amount of heat per unit time radiated from the CR motor 4 decreases with time. Therefore, the rest time of the CR motor 4 becomes more appropriate by setting the rest time to increase and decrease exponentially with respect to the increase and decrease of the average value tav. Further, as shown in FIG. 7, since the pause time increases and decreases exponentially, the pause time can be calculated seamlessly, and even if the fluctuation of the average value tav is slight, the pause time corresponding to the fluctuation Can be calculated. Therefore, it is possible to calculate the downtime more appropriately reflecting the motor internal temperature.

[Embodiment 2]
FIG. 8 is a block diagram mainly illustrating the configuration of the control unit 61 of the printer 1 according to the second embodiment of the present invention. FIG. 9 is a block diagram mainly showing the configuration of the coil resistance detection circuit 51. FIG. 10 is a flowchart of motor pause control according to the second embodiment of the present invention.

  The first embodiment and the second embodiment of the present invention are different in the motor pause control method. More specifically, the control unit 61 of the printer 1 includes a coil resistance detection circuit 51, and the point where the motor internal temperature is calculated from the coil resistance value detected by the coil resistance detection circuit 51, and the calculated motor internal The difference is that when the temperature exceeds the specified temperature, the CR motor 4 is stopped for a predetermined time. Hereinafter, the configuration of the control unit 61 and the motor pause control according to the present embodiment will be described with reference to FIGS. In the present embodiment, since the configuration other than the above configuration is the same as the configuration of the first embodiment, the common configurations are denoted by the same reference numerals and detailed description thereof is omitted.

(Configuration of printer control unit)
As shown in FIGS. 8 and 9, the control unit 61 of this embodiment detects the coil resistance value of the winding coil 50 (see FIG. 9) of the CR motor 4 in addition to the configuration of the control unit 21 of the first embodiment. A coil resistance detection circuit 51 is provided. The coil resistance detection circuit 51 is connected to the main control circuit 22. Further, the CPU 23 of the present embodiment is an internal temperature calculation unit that calculates the internal temperature of the CR motor 4 from the coil resistance value of the winding coil 50 of the CR motor 4 detected by the coil resistance detection circuit 51. In this embodiment, a motor temperature detection means for detecting the motor internal temperature of the CR motor 4 is constituted by the coil resistance detection circuit 51 and the CPU 23 as the internal temperature calculation means.

  As shown in FIG. 9, the coil resistance detection circuit 51 includes a measurement voltage generator 52 that applies a constant rated measurement voltage to the winding coil 50 of the CR motor 4, and a winding of the CR motor 4 when the rated measurement voltage is applied. A current detection unit 53 that detects a current flowing through the coil 50, and is electrically connected to the winding coil 50 of the CR motor 4. In this coil resistance detection circuit 51, the coil resistance value is calculated from the voltage value applied from the measurement voltage generation unit 52 and the current value detected by the current detection unit 53 and is output to the main control circuit 22. It is configured.

  The configuration of the coil resistance detection circuit 51 is not limited to the configuration shown in FIG. 9, and various configurations can be adopted as long as the coil resistance value can be detected. For example, the coil resistance detection circuit 51 includes a measurement current supply unit that supplies a constant rated measurement current to the winding coil 50 of the CR motor 4 and a voltage generated in the winding coil 50 of the CR motor 4 when the rated measurement current is supplied. You may comprise so that the voltage detection part to detect may be provided.

The CPU 23 as the internal temperature calculating means calculates the internal temperature of the CR motor 4 from the coil resistance value of the winding coil 50 of the CR motor 4 detected by the coil resistance detection circuit 51 by the resistance method. . More specifically, the motor internal temperature is calculated by the following equation.
T2 = R2 / R1 × (234.5 + T1) −234.5 (Expression 1)
R1: Coil resistance value before energization (Ω), R2: Coil resistance value after energization (Ω)
T1: Motor internal temperature (° C) before energization T2: Motor internal temperature (° C) after energization

(Motor pause control of CR motor)
In this embodiment, as shown in FIG. 10, first, when a print command is input from the external device to the interface circuit 29, a pre-printing preparatory operation for carrying the carriage 3 one pass without driving the printing paper P is performed. During the operation, the duty value ton of the PWM drive signal Sdr supplied to the CR motor 4 is detected (step S20). More specifically, the average value tav0 of the duty value ton in the entire constant speed region of the CR motor 4 is calculated as in the first embodiment.

  When the preliminary operation is completed, the motor internal temperature T2o is calculated (step S21). That is, the coil resistance detection circuit 51 calculates the coil resistance value R2o of the winding coil 50 of the CR motor 4 from the voltage value applied from the measurement voltage generator 52 and the current value detected by the current detector 53. The coil resistance value R2o is output to the main control circuit 22. The CPU 23 calculates the motor internal temperature T2o from the coil resistance value R2o input to the main control circuit 22 by the above-described equation (1). Here, the motor internal temperature T1 before energization and the coil resistance value R1 before energization in Equation (1) are obtained in advance by experiments. The motor internal temperature T1 before energization can be obtained, for example, by measuring the temperature of the case body of the CR motor 4 that has been left for a while without being energized, or from the room temperature at which the CR motor 4 is installed.

  When the motor internal temperature T2o after the preliminary operation is calculated, it is determined whether or not the motor internal temperature T2o is equal to or lower than a specified temperature (step S22). In this embodiment, the CR motor 4 is controlled so that the winding coil 50 does not exceed the allowable temperature of 155 ° C. as in the first embodiment described above, and 130 ° C. is set as the specified temperature.

  If the motor internal temperature T2o exceeds the specified temperature, the CR motor 4 is paused for a predetermined pause time before causing the carriage 3 to perform a one-pass printing operation (step S23). Here, the rest time of the CR motor 4 is calculated by a predetermined calculation formula from the average value tav0 of the duty value ton as in the first embodiment. That is, as shown in FIG. 7, when the average value tav0 exceeds the specified duty value ton11, an exponential function using a value (tav0−ton11) obtained by subtracting the specified duty value ton11 from the average value tav0 as a parameter, The rest time of the CR motor 4 is calculated.

  When the motor internal temperature T2o is equal to or lower than the specified temperature, or after the CR motor 4 is stopped for a predetermined stop time, the CR motor 4 causes the carriage 3 to perform a one-pass printing operation, and the printing operation is performed. The duty value ton of the PWM drive signal Sdr supplied to the CR motor 4 is detected (step S24). Also here, the average value tav of the duty value ton over the entire constant speed region of the CR motor 4 is calculated.

  When the printing operation for one pass is completed, the motor internal temperature T2 is calculated (step S25). The calculation of the motor internal temperature T2 is performed by the calculation method in step S21 described above. That is, the CPU 23 calculates the motor internal temperature T2 from the coil resistance value R2 detected by the coil resistance measurement circuit 51 according to the equation (1).

  When the motor internal temperature T2 is calculated, it is determined whether or not there is data to be continuously printed, that is, whether or not there is print data (step S26). If there is print data, the process returns to step S22 to determine whether or not the motor internal temperature T2 is equal to or lower than the specified temperature T11. When the motor internal temperature T2 exceeds the specified temperature T11, a value (tav−ton11) obtained by subtracting the specified duty value ton11 from the average value tav using the average value tav calculated in step S25 is used as a parameter. The rest time of the CR motor 4 is calculated by an exponential function. Then, the CR motor 4 is paused before the calculated pause time and the printing operation for the next one pass (step S23). When the motor internal temperature T2 is equal to or lower than the specified temperature T11, or after the CR motor 4 is stopped for a predetermined stop time, the next one-pass printing operation is performed (step S24). If it is determined in step S26 that there is no print data, the printing operation for the printing paper P or the like is terminated.

  In this embodiment as well, the determination in step S22 and the processing in step S23 are performed by a memory such as the main drive circuit 22, the CPU 23, and the ROM 24 that constitute the motor pause means. In addition, average values tav and tav0 corresponding to the motor load of the CR motor 4 are calculated by the CPU 23 serving as load detecting means.

(Main effects of this form)
As described above, in this embodiment, when the motor internal temperature calculated from the resistance value detected by the coil resistance detection circuit 51 exceeds the specified temperature, the CR motor 4 is suspended for a predetermined time. Therefore, it is possible to determine whether the CR motor 4 needs to be stopped based on the motor internal temperature that directly causes the winding coil 50 to burn out. Therefore, in addition to the effect of the first embodiment described above, the printer 1 of the present embodiment has an effect that the CR motor 4 can be more reliably prevented from overheating.

[Embodiment 3]
FIG. 11 is a flowchart of motor pause control according to the third embodiment of the present invention. FIG. 12 is a graph showing the relationship between the motor internal temperature of the CR motor 4 and the pause time in the motor pause control.

  In the third embodiment of the present invention, the control unit 61 of the printer 1 includes a coil resistance detection circuit 51, and the motor internal temperature is calculated from the coil resistance value detected by the coil resistance detection circuit 51. Most of the configurations are the same as those of the second embodiment, such as the CR motor 4 being stopped for a predetermined time when the motor internal temperature exceeds the specified temperature. The difference from the second embodiment is that the rest time of the CR motor 4 is calculated from the motor internal temperature. Hereinafter, the motor suspension control according to this embodiment will be described with reference to FIGS. 11 and 12. A detailed description of the configuration common to the second embodiment will be omitted.

  In this embodiment, as shown in FIG. 11, when a print command is input from the external device to the interface circuit 29, a pre-printing preparatory operation for carrying the carriage 3 one pass without driving the printing paper P is performed. After the operation is completed, the motor internal temperature T2o is calculated (step S30). The calculation of the motor internal temperature T2o is performed by the calculation method in step S21 of the second embodiment described above.

  When the motor internal temperature T2o after the preliminary operation is calculated, it is determined whether or not the motor internal temperature T2o is equal to or lower than a specified temperature (step S31). Also in this embodiment, as in the second embodiment, 130 ° C. is set as the specified temperature. In this embodiment, the specified temperature is set as the specified temperature T11.

  If the motor internal temperature T2o exceeds the specified temperature T11, the CR motor 4 is paused for a predetermined pause time before causing the carriage 3 to perform a one-pass printing operation (step S32). Here, the rest time of the CR motor 4 is calculated from the motor internal temperature T2o by a predetermined calculation formula. In this embodiment, as shown in FIG. 12, when the motor internal temperature T2o exceeds a specified temperature T11 (130 ° C. in this embodiment), a value obtained by subtracting the specified temperature T11 from the motor internal temperature T2o (T2o−T11). The rest time of the CR motor 4 is calculated by an exponential function with the parameter). A temperature T12 shown in FIG. 12 is an allowable temperature of the winding coil 50, and is 155 ° C. in this embodiment.

  When the motor internal temperature T2o is equal to or lower than the specified temperature T11, or after the CR motor 4 is suspended for a predetermined pause time, the CR motor 4 causes the carriage 3 to perform a one-pass printing operation. After the operation, the motor internal temperature T2 is calculated (step S33). The calculation of the motor internal temperature T2 is performed by the calculation method in step S21 of the second embodiment described above. That is, the CPU 23 calculates the motor internal temperature T2 from the coil resistance value R2 detected by the coil resistance measurement circuit 51 according to the equation (1).

  When the motor internal temperature T2 is calculated, it is determined whether there is data to be continuously printed, that is, whether there is print data (step S34). If there is print data, the process returns to step S31 to determine whether or not the motor internal temperature T2 is equal to or lower than the specified temperature T11. When the motor internal temperature T2 exceeds the specified temperature T11, the motor internal temperature T2 calculated in step S33 is used to subtract the specified temperature T11 from the motor internal temperature T2 (T2-T11) as a parameter. The rest time of the CR motor 4 is calculated by an exponential function. Then, the CR motor 4 is paused before the printing operation for the next one pass during the calculated pause time (step S32). When the motor internal temperature T2 is equal to or lower than the specified temperature T11, or after the CR motor 4 is suspended for a predetermined pause time, the next one-pass printing operation is performed (step S33). If it is determined in step S34 that there is no print data, the printing operation for the printing paper P or the like is terminated.

  In this embodiment as well, the determination in step S31 and the processing in step S32 are performed by a memory such as the main drive circuit 22, the CPU 23, and the ROM 24 that constitute the motor suspension unit.

  As described above, the printer 1 of this embodiment calculates the motor internal temperature from the coil resistance value detected by the coil resistance detection circuit 51, and calculates the rest time of the CR motor 4 from the calculated motor internal temperature. Yes. Therefore, it is possible to calculate an appropriate rest time that reflects the actual motor internal temperature of the CR motor 4. As a result, the CR motor 4 can be reliably prevented from overheating, and the winding coil 50 can be prevented from being burned out.

  In this embodiment, the rest time of the CR motor 4 is calculated by an exponential function having a value (T2−T11) obtained by subtracting the specified temperature T11 from the motor internal temperature T2 (or T2o) as a parameter. That is, the rest time of the CR motor 4 increases and decreases exponentially with respect to the increase and decrease of the motor internal temperature T2. Therefore, as in the first embodiment, the rest time of the CR motor 4 becomes more appropriate. Further, since the pause time can be calculated seamlessly, it is possible to calculate the pause time more appropriately reflecting the internal temperature of the motor.

[Other embodiments]
Each form mentioned above is an example of the suitable form of this invention, However, It is not limited to this, In the range which does not change the summary of this invention, various deformation | transformation are possible.

  For example, in the first and second embodiments described above, the average value tav of the duty value ton in the actual printing operation on the printing object such as the printing paper P (or the average value tav0 of the duty value in the preliminary operation) is used. Although the rest time of the CR motor 4 is calculated, the rest time may be calculated as follows. That is, first, an initial operation when the printer 1 is turned on is performed, and an initial average value tav01 of the duty value ton in the constant speed region in the initial operation is detected as the initial motor load of the CR motor 4. Then, a predetermined calculation may be performed by using a subtraction value obtained by subtracting the initial average value tav01 from the average value tav (or the average value tav0) serving as a printing motor load during the printing operation, and the rest time may be calculated.

  In the case of an inkjet printer such as the printer 1, the amount of ink in the black ink cartridge 13 and the color ink cartridge 14 mounted on the carriage 3 is consumed every time printing is performed. For this reason, the weight of the carriage 3 decreases every time printing is performed. In addition, some of the ink droplets ejected from the print head 2 become ink mist and adhere to the guide shaft 9. The transport load of the carriage 3 changes with time due to such changes in the mechanical state over time, such as a decrease in the weight of the carriage 3 and the influence of ink adhering to the guide shaft 9. Therefore, when calculating the rest time of the CR motor 4 using the average value tav, the rest time that appropriately reflects the motor internal temperature may not be calculated. As described above, when the initial average value tav01 in the initial operation is detected and the subtraction value obtained by subtracting the initial average value tav01 from the average value tav (or average value tav0) at the time of the printing operation is used, A motor load with less influence can be calculated. Therefore, the internal temperature of the CR motor 4 can be grasped more appropriately by the calculated subtraction value, and a more appropriate downtime can be calculated.

  In the first and second embodiments described above, the CR motor 4 is controlled by the PWM control method, and the duty value ton of the PWM drive signal Sdr is detected as the motor load. Control may be performed using a control method, and a current value may be calculated as a motor load. In this case, the rest time of the CR motor 4 may be calculated from the calculated current value by a predetermined calculation.

  Further, in Embodiments 1 and 2 described above, the average values tav and tav0 of the duty value ton in the entire constant speed region of the CR motor 4 are calculated as the motor load, but the duty value ton of a part of the constant speed region is calculated. The average values tav and tav0 may be detected. Further, the motor load of the CR motor 4 may be detected by detecting the duty value ton during one switching cycle tp. Further, the acceleration time of the CR motor 4 may be constant, and the duty value ton in the acceleration region of the CR motor 4 may be detected to obtain the motor load of the CR motor 4. Similarly, the duty in the deceleration region of the CR motor 4 may be detected. The value ton may be detected and used as the motor load of the CR motor 4.

  Furthermore, in each of the above-described embodiments, the rest time of the CR motor 4 is calculated from the motor internal temperatures T2, T2o and the average values tav, tav0 of the duty value ton, but the coil detected by the coil resistance detection circuit 51 The rest time of the CR motor 4 may be calculated from the resistance values R2 and R2o.

  In the motor pause control of the second and third embodiments described above, the coil resistance detection circuit 51 detects the coil resistance values R2 and R2o of the winding coil 50 after the preliminary operation or the one-pass printing operation. However, the coil resistance values R2 and R2o may be detected simultaneously with the preliminary operation or the printing operation.

  Furthermore, in Embodiments 2 and 3 described above, the internal temperature of the CR motor 4 is calculated from the resistance value of the winding coil 50 by the resistance method. However, a thermometer for measuring the internal temperature of the CR motor 4 may be provided as the motor temperature detecting means, and the downtime may be calculated from the internal temperature of the motor detected by the thermometer.

  Furthermore, in each embodiment described above, the CR motor 4 has been described as an example of a motor mounted on the printer 1. However, the motor suspension control of each embodiment described above is performed for the PF motor 5 and other motors in the printer 1. Can also be applied.

1 is a schematic perspective view showing a configuration of a main part of a printer according to an embodiment of the present invention. FIG. 2 is a block diagram mainly illustrating a configuration of a control unit of the printer according to the first embodiment. The block diagram which shows the structure of the drive control apparatus of CR motor. The graph which shows the present rotational speed signal and target rotational speed in the conveyance process of 1 pass of a carriage. The figure which shows an example of the PWM drive signal supplied to CR motor. 4 is a flowchart of motor suspension control according to the first embodiment. The graph which shows the relationship between the duty value of CR motor, and the rest time in motor rest control. FIG. 3 is a block diagram mainly illustrating a configuration of a control unit of the printer according to the second embodiment. The block diagram which mainly shows the structure of a coil resistance detection circuit. 10 is a flowchart of motor pause control according to the second embodiment. 10 is a flowchart of motor suspension control according to the third embodiment. The graph which shows the relationship between the motor internal temperature of CR motor, and the rest time in motor rest control.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Printer, 4 ... CR motor (carriage motor, motor), 22 ... Main drive circuit (a part of motor pause means), 23 ... CPU (a part of a load detection means, a motor temperature detection means, one of motor pause means) Part), 24... ROM (part of motor suspension means), 25... RAM (part of motor suspension means), 26... EEPROM (part of motor suspension means), 51... Coil resistance detection circuit (motor temperature detection means) Part), P ... printing paper (printing object), T2 / T2o ... motor internal temperature, Sdr ... PWM drive signal, ton ... duty value, tv.tav0 ... average value

Claims (9)

In a printer that prints on a print object,
Load detection means for detecting the motor load of the mounted motor;
A printer comprising: a motor pause unit that calculates a pause time from the motor load detected by the load detection unit and causes the motor to pause during the printing process on the print object.   The printer according to claim 1, wherein the motor is controlled by a PWM control method, and the load detection unit detects a duty value of a PWM drive signal supplied to the motor.   The printer according to claim 2, wherein the load detection unit detects an average value of duty values in a constant speed region in which the motor is conveyed at a constant speed.   4. The printer according to claim 1, wherein the pause time calculated by the motor pause means increases and decreases exponentially with respect to the increase and decrease of the motor load detected by the load detection means. In a printer that prints on a print object,
Motor temperature detection means for detecting the motor internal temperature of the mounted motor;
A printer comprising: a motor pause unit that calculates a pause time from the internal temperature of the motor detected by the motor temperature detector, and pauses the motor for the pause time in a printing process on the print object. .   6. The printer according to claim 5, wherein the pause time calculated by the motor pause means increases and decreases exponentially with respect to the increase and decrease of the motor internal temperature detected by the motor temperature detection means. In order to prevent overheating of the motor mounted on the printer, in the process of printing on the printing object, in the printer motor control method for performing motor pause control to pause the motor for a predetermined pause time,
A method for controlling a printer motor, comprising: detecting a motor load of the motor; and calculating a pause time of the motor from the motor load.   The initial motor load of the motor is detected by an initial operation when power is supplied to the printer, and the motor load is a subtraction value obtained by subtracting the initial motor load from the print motor load during the printing operation of the printer. The method for controlling a printer motor according to claim 6. In order to prevent overheating of the motor mounted on the printer, in the process of printing on the printing object, in the printer motor control method for performing motor pause control to pause the motor for a predetermined pause time,
A method for controlling a printer motor, comprising: detecting a motor internal temperature of the motor and calculating a pause time of the motor from the internal temperature of the motor.

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