JPH08217273A - Printer - Google Patents

Abstract

PURPOSE: To automatically change the position of a paper feeding roller according to the size change of paper sheets as well as to reduce the manufacturing cost by decreasing the number of parts. CONSTITUTION: In a printer, a paper sheet P1 is fed out from a paper sheet feeding holder 8 by respectively rotating and driving a paper sheet feeding roller 1, a paper sheet feeding roller 2 and paper sheet discharging rollers 3, and the paper sheet P1 is printed by a printing part 7 attached to a carriage 6 by reciprocating the carriage 6. The paper feeding roller 1 is so constituted as to be rotated together with a driving shaft 1a by being fitted around a paper feeding driving shaft 1a arranged in the direction perpendicular to the paper feeding direction A, and as to be moved along the axial direction of the driving shaft 1a, and the carriage 6 is supported by the paper feeding driving shaft 1a and a guide rail 5 parallel, to the paper feeding driving shaft 1a so as to be moved along the direction perpendicular to the paper feeding direction A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer such as an ink jet printer or a facsimile machine.

[0002]

2. Description of the Related Art Conventionally, as an example of an ink jet type printer, there is one shown in FIGS. This is the paper feed roller 1, the paper feed roller 2 along the paper feed direction A.
And paper discharge rollers 3 are arranged at predetermined intervals, the paper feed roller 1 is fixed to the paper feed drive shaft 1a so as to be movable in the axial direction, and the paper feed roller 2 is paper feed drive shaft 2a.
The paper discharge roller 3 is fixed to the paper discharge drive shaft 3a, and is supported by the guide rod 4 and the guide rail 5 between the paper feed roller 2 and the paper discharge roller to feed the paper in the paper feed direction A.
Carriage 6 reciprocally movable in a direction orthogonal to
An inkjet printing unit 7 is attached to the carriage 6, and a control unit for controlling the rollers 1, 2, 3, the carriage 6 and the printing unit 7 in response to a command from a printing command unit is provided. After the paper P1 is set in the paper feed holder 8, the rollers 1, 2 and 3 are rotated by the control unit which receives a command from the print command unit, and the paper P1 is sent out from the paper feed holder 8. The carriage 6 is reciprocated so that the printing unit 7 prints on the paper P1. In addition, 9 and 10 are pressing rollers.

[0003]

SUMMARY OF THE INVENTION In the above conventional configuration,
Since the supporting member for the sheet feeding roller 1 (feeding drive shaft 1a) and the supporting member for the carriage 6 (guide rod 4 and guide rail 5) are provided separately, the number of parts is large and the manufacturing cost is high. It has the drawback of being expensive.

Further, the paper feed roller 1 is manually moved in the axial direction, as shown by the solid line in FIG.
For example, as shown by a phantom line in FIG. 8, from a state where a sheet P1 of A4 standard size is set in the sheet feeding holder 8 and the position of the sheet feeding roller 1 is set according to the sheet P1.
When, for example, a B5 type small size (or B4 type large size) sheet P2 is set in the paper feed holder 8 and the size is changed, the sheet P2 is placed with respect to the center O1 of the sheet P1.
Since the center O2 of the sheet is deviated by a predetermined width α, there is a possibility that the sheet P2 may meander out from the sheet feeding holder 8 if the sheet feeding roller 1 is rotated without changing its position. However, there is a drawback in that the position of the paper feed roller 1 must be manually adjusted, and the position adjustment is troublesome and troublesome.

In view of the above conventional problems, the present invention can reduce the manufacturing cost by reducing the number of parts, and
An object of the present invention is to provide a printing device that can automatically change the position of a paper feed roller according to the size change of paper.

[0006]

In order to achieve the above-mentioned object, the invention according to claim 1 includes a paper feed roller, a paper feed roller and a paper discharge roller which are arranged at predetermined intervals along the paper feed direction. Printing by feeding the paper from the paper feed holder by rotating it and moving the carriage back and forth along the direction orthogonal to the paper feeding direction so that the printing unit attached to the carriage prints on the paper. In the apparatus, the paper feed roller is externally fitted to a paper feed drive shaft arranged in a direction orthogonal to the paper feed direction, and is configured to be rotatable integrally with the drive shaft. The carriage is supported by the paper feed drive shaft and a guide rail parallel to the drive shaft so as to be movable along a direction orthogonal to the paper feed direction. hand It is characterized in Rukoto.

A second aspect of the invention is characterized in that, in the first aspect of the invention, the paper feed roller is rotatably held by a carriage.

The invention according to claim 3 is the invention according to claim 1 or 2.
In the invention described above, a pair of left and right paper feed rollers are provided on both sides of the carriage, and both paper feed rollers are rotatably connected to the carriage.

According to a fourth aspect of the present invention, there is provided a control unit for controlling a paper feed roller, a paper feed roller and a paper discharge roller arranged at predetermined intervals along the paper feed direction, and a carriage having a printing unit. The controller rotates the rollers to feed the paper from the paper feed holder, and the carriage reciprocates in the direction orthogonal to the paper feed direction to print on the paper by the printing unit. In the printing apparatus configured as described above, the paper feed roller is rotatably connected to the carriage, and the control unit receives the instruction from the paper size setting unit and the print command unit and controls the paper feed roller via the carriage. It is characterized in that it is configured to be moved to the central portion of the paper.

[0010]

According to the present invention, the paper is set in the paper feed holder, and the paper feed roller, the paper feed roller, and the paper discharge roller are driven to rotate, whereby the paper is fed out from the paper feed holder. Further, the carriage is reciprocally moved, and the printing unit attached to the carriage can print on the paper.

In this case, since the supporting member of the sheet feeding roller (feeding drive shaft) also serves as the supporting member of the carriage, the number of parts is smaller, the manufacturing cost is lower, and the space saving is smaller than the conventional one. Is possible.

According to the second aspect of the invention, since the paper feed roller is rotatably sandwiched by the carriage, the paper is set in the paper feed holder and then the carriage is moved to the center of the paper. The paper feed roller can also be automatically moved to the central portion of the paper, whereby the paper can be linearly sent out from the paper feed holder without meandering.

According to the third aspect of the invention, the pair of left and right paper feed rollers are provided on both sides of the carriage, and both paper feed rollers are rotatably connected to the carriage.
Similarly to the invention according to claim 2, the both paper feed rollers can be automatically moved to the central portion of the paper, and the width of the both paper feed rollers is wide, so that the paper feed holder can move the paper from the paper feed holder. Can be sent out more reliably in a straight line.

According to the fourth aspect of the present invention, for example, B5 type small size (or B4 type large size) sheets are set in the sheet feeding holder from the state where A4 type standard size sheets are set in the sheet feeding holder. Even when the size is set and the size is changed, the control unit that receives commands from the paper size setting unit and print command unit automatically moves the paper feed roller to the center of the resized paper via the carriage. Can be made.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an inkjet type printer according to a first embodiment of the present invention, in which a feed drive shaft 1a has a substantially oval cross section in which both sides of a circular shaft are flat. Is formed on the paper feed roller 1, and the paper feed drive shaft 1 is attached to the paper feed roller 1.
The paper feed roller 1 is formed with a through hole having the same shape as a.
Is externally fitted to the paper feed drive shaft 1a, the paper feed roller 1 is configured to be rotatable integrally with the paper feed drive shaft 1a, and is arranged along the axial direction of the paper feed drive shaft 1a. It is configured to be movable.

A flat surface portion 1A is formed by partially cutting off the outer peripheral surface of the paper feeding roller 1, and the flat surface portion 1A is made to face a paper P1 of standard size A4 set in a paper feeding holder 8. From this state, by rotating the paper feed roller 1 once, the paper P1 can be sent out from the paper feed holder 8.

One end of the carriage 6 is slidably supported by the guide rail 5, and a circular through hole 12 penetratingly provided at the other end is rotatably fitted on the paper feed drive shaft 1a. In this case, since the supporting member of the sheet feeding roller 1 (feeding drive shaft 1a) also serves as the supporting member of the carriage 6, the number of parts is smaller, the manufacturing cost is lower, and the space is smaller than the conventional one. This enables miniaturization.

Since the paper feed roller 1 is rotatably sandwiched by the carriage 6, as shown by the solid line in FIG. 3, the paper feed roller 1 is also moved by moving the carriage 6 to the central portion of the paper P1. The sheet P1 can be automatically moved to the central portion of the sheet P1, and thus the sheet P1 can be linearly sent out from the sheet feed holder 8 without meandering.

In FIG. 4, reference numeral 14 denotes a control unit of the printing apparatus, which is composed of a microcomputer and has a paper size setting unit 1
5 and a command signal from the print command unit 16 to control the carriage drive unit 6A, the paper feed roller drive unit 1A, the paper feed roller drive unit 2A, the paper discharge roller drive unit 3A, and the print unit 7, respectively. The rollers 6 are rotated and the carriage 6 is reciprocated, and the printing unit 7
Is controlled to print on the paper P1. It should be noted that, in the configuration other than the above, the same parts as those in the conventional example shown in FIGS.

The operation of the control unit 14 will be described with reference to the flowchart of FIG. 5. First, the paper P1 is set in the paper feed holder 8, and the paper size setting unit 15 sets the size of the paper P1 (A4 standard size). (S1), and the print command unit 16 issues a print command (S2). Next, if the print command signal and the detection signal of the detector that detects that the paper P1 is set in the paper feed holder 8 are output, it is determined that the paper P1 is set in the paper feed holder 8. Judgment (S3), the carriage 6 is moved from the standby position to the paper P1.
Of the paper feed roller 1
Is also moved from the standby position to the center of the sheet P1 (S
4). After a lapse of a predetermined time from the output of the print command signal, the paper feed roller drive unit 1A, the paper feed roller drive unit 2A and the paper discharge roller drive unit 3A are operated to rotate the paper feed roller 1 once (S5). The paper feed roller 2 and the paper discharge roller 3 are rotated (S6), and the paper P1 is sent out from the paper feed holder 8. The leading end of the fed paper P1 is detected by the paper feed detection sensor, and the carriage drive unit 6A and the printing unit 7 are driven based on the detection signal to start printing (S7). When the printing is completed (S
8) Based on the detection signal, the carriage 6 is returned to the original standby position, and at the same time, the paper feed roller 1 is also returned to the original standby position (S9).

In the above structure, as shown by the phantom line in FIG. 3, the A4 standard size paper P1 set in the paper feed holder 8 is changed to, for example, the B5 small size paper (or the B4 large size paper) P2. In case of paper P1
The center O2 of the paper P2 is displaced from the center O1 of the paper P2 by a predetermined width α, but the paper P2 in which the paper feed roller 1 is resized via the carriage 6 by the control unit 14 that has received the instruction from the paper size setting unit 15 described above. The sheet P2 can be automatically moved to the central portion of the sheet, and the sheet P2 can be linearly fed out without causing the sheet P2 to meander.

FIG. 6 shows a second embodiment of the present invention. A pair of left and right paper feed rollers 1 are provided on both sides of a carriage 6, and both paper feed rollers 1 are rotatably connected to the carriage 6. Has been done. Since the configuration other than the above is almost the same as that of the first embodiment, the same reference numerals are given to the same portions and the description thereof will be omitted.

According to the above construction, as in the first embodiment, both paper feed rollers 1 can be automatically moved to the central portion of the paper P1 and the width H of both paper feed rollers 1 can be moved.
Since the width is wide, the paper P1 can be more reliably linearly fed from the paper feed holder 8.

[0024]

According to the first aspect of the invention, since the supporting member (feeding drive shaft) of the sheet feeding roller also serves as the supporting member of the carriage, the number of parts is smaller than in the conventional case,
The manufacturing cost is low and space saving and miniaturization are possible.

According to the second aspect of the present invention, since the paper feed roller is rotatably sandwiched by the carriage, after the paper is set in the paper feed holder, the carriage is moved to the central portion of the paper. The paper feed roller can be automatically moved to the central portion of the paper, whereby the paper can be linearly sent out from the paper feed holder without meandering.

According to the third aspect of the invention, the pair of left and right paper feed rollers are provided on both sides of the carriage, and both paper feed rollers are rotatably connected to the carriage.
Similarly to the invention according to claim 2, the both paper feed rollers can be automatically moved to the central portion of the paper, and the width of the both paper feed rollers is wide, so that the paper feed holder can move the paper from the paper feed holder. Can be sent out more reliably in a straight line.

According to the fourth aspect of the present invention, for example, B5 type small size (or B4 type large size) sheets are set in the sheet feeding holder from the state where A4 type standard size sheets are set in the sheet feeding holder. Even when the size is set and the size is changed, the control unit that receives commands from the paper size setting unit and print command unit automatically moves the paper feed roller to the center of the resized paper via the carriage. The position can be adjusted more quickly than in the conventional case where the position of the paper feed roller is adjusted manually.

[Brief description of drawings]

FIG. 1 is a perspective view showing an ink jet type printer according to a first embodiment of the present invention.

FIG. 2 is a schematic side view of the same.

FIG. 3 is a schematic plan view of the same.

FIG. 4 is a block diagram illustrating a drive control mechanism used in the printing apparatus.

FIG. 5 is a flowchart illustrating an operation of the drive control mechanism.

FIG. 6 is a perspective view showing an ink jet type printer according to a second embodiment of the present invention.

FIG. 7 is a schematic side view showing a conventional example.

FIG. 8 is a schematic plan view of the same.

[Explanation of symbols]

 1 Paper Feed Roller 1a Paper Feed Drive Shaft 2 Paper Feed Roller 3 Paper Ejection Roller 5 Guide Rail 6 Carriage 7 Printing Section 8 Paper Feed Holder 14 Control Section 15 Paper Size Setting Section 16 Print Command Section A Paper Feed Direction P1 Paper P2 Paper

Claims (4)

[Claims] 1. A paper is fed from a paper feed holder by rotationally driving a paper feed roller, a paper feed roller, and a paper discharge roller arranged at predetermined intervals along the paper feed direction. In a printing device in which a carriage is reciprocally moved in a direction orthogonal to each other to print on the paper by a printing unit attached to the carriage, the paper feed roller is arranged in a direction orthogonal to the paper feed direction. The carriage is configured to be fitted onto an established paper feed drive shaft so as to be rotatable integrally with the drive shaft and movable along the axial direction of the drive shaft. A printing apparatus, which is supported by a paper drive shaft and a guide rail parallel to the drive shaft so as to be movable in a direction orthogonal to the paper feed direction. 2. The printer according to claim 1, wherein the paper feed roller is rotatably held by a carriage. 3. The printer according to claim 1, wherein a pair of left and right paper feed rollers are provided on both sides of the carriage, and both paper feed rollers are rotatably connected to the carriage. 4. A control unit for controlling a paper feed roller, a paper feed roller and a paper discharge roller arranged at predetermined intervals in the paper feed direction, and a carriage having a printing unit attached thereto is provided by the control unit. A printing device in which each of the rollers is rotationally driven to feed a sheet from a sheet feeding holder, and the carriage is reciprocated in a direction orthogonal to a sheet feeding direction to print on the sheet by the printing unit. The paper feed roller is rotatably connected to the carriage, and the control unit receives the command from the paper size setting unit and the print command unit and moves the paper feed roller to the central portion of the paper via the carriage. A printing device, which is configured to perform.