JPS635824B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a floppy disk device.

A floppy disk device records a large number of concentric magnetic tracks on a thin disc-shaped medium that is held in a thin square diskette and has a circular opening in the center. The medium is rotated by a driving device that is loaded and engaged with a circular opening of the medium, and a desired recording/playback is performed by a recording/playback head that is opposed to or in contact with both sides of the medium through an opening provided at a predetermined position of the diskette. In such conventional floppy disk devices, the recording/reproducing head is moved against the medium of the floppy disk which is held in the operating position by the locking operation of the operating member by the locking device. If you accidentally release the floppy disk while the recording/playback operation is in progress and release the locking operation of the operating member by the locking device, there is a risk of damaging the recording/playback head and the floppy disk. In order to prevent such malfunctions, an electromagnetic device such as a plunger has been specifically provided to lock the locking device and prevent accidental unlocking of the operating member. As a result, the mechanical parts were complicated and expensive.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned drawbacks, provide a floppy disk device that is simple in structure, inexpensive to manufacture, and reliable in operation.

A feature of the present invention is that the recording/playback head is held in the recording/playing position by the actuation of the electromagnetic device used to hold the recording/playing head in the recording/playing position by the operation of the recording/playback switch. During this period, the release operation of the locking member that locks the operating button in the locked position is prevented through the operating plate operated by the electromagnetic device.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a plan view showing the main parts of a floppy disk device incorporating the present invention, and to explain its overall operation, the floppy disk is inserted into the front plate 2 attached to the front of the machine frame 1. Slit 3 (second
Insert the floppy disk from the floppy disk (see figure) and guide both edges of the floppy disk using the guide grooves formed in the guide members 4 and 5 provided on both sides of the machine frame 1 to release the media in the diskette of the floppy disk. When the operating button 7 is pushed into the position where the central circular opening matches the cylinder 6 (Fig. 6) for rotating the media, the control groove provided in the operating button 7 and the The locking member 8 that swings together locks the operating button 7 in the pushed-in locking position, and thereby the connecting member 9 that swings in conjunction with the operating button 7 extends downward. Part 9
a (FIG. 3), the setting member 11, which is normally biased upwardly by the leaf spring 10 and swingably attached to the machine frame 1, swings downward and becomes rotatable to the setting member 11. The lower tapered portion 12a of the collet 12 is concentric with the cylinder 6 supported by the cylinder 6.
(Fig. 3) is fitted into the cylinder 6, and the circular opening at the center of the floppy disk medium is concentrically held between them, and the medium is rotated by the cylinder 6. For driving, the cylinder 6 and one large diameter pulley 6a are interlocked with the pulley 14 of the DC motor 13 by a belt 6b, and the cylinder 6 is rotationally driven by the DC motor 13. The speed of the DC motor 13 is controlled to a predetermined speed by a strobe disk 15 that rotates integrally with the DC motor 13, thereby keeping the rotational speed of the floppy disk medium constant.

On the other hand, the lower surface of the media exposed through an elongated opening 16 formed at a predetermined position in the diskette of the loaded floppy disk has a pair of parallel guide rods 1.
sliding carriage 1 slidably guided in 7, 18;
Operation of the stepper motor 20, which cooperates with a lower recording head (not shown) attached to the recording head 9 and is controlled by a control computer as described below, causes a carriage drive pulley fixed to the shaft of the stepper motor 20. The sliding carriage 19 is stepped a predetermined amount via a drive metal band 22 wrapped around the magnetic head 21 and attached at both ends to the sliding carriage 19 to switch the lower recording/playback head between predetermined magnetic tracks on the media. Do it like this.

Note that when the central opening of the media of the floppy disk is pushed into the recording/reproducing operating position concentric with the cylinder 6, the lower surface of the diskette rests on the upper surface of the guide protrusion 7a formed in the operation button 7 and raised upward. The projection 7b (FIG. 5) formed on the lower surface of the operating button 7 slides on the bottom plate 1a of the machine frame 1 until the operating button 7 is pushed from the release position to the locking position. The button 7 is positioned slightly upward, so that the floppy disk guided on the guide protrusion 7a is held at a slight distance from the lower recording head attached to the sliding carriage 19, so that the floppy disk can be moved slightly upwardly. There is no risk of damaging the floppy disk or the lower recording/playback head during the pressing operation, and at the final stage of pressing the operation button 7, the projection 7b on the lower surface of the operation button 7 forms a recording/playback recess 1b formed in the bottom plate 1a. The lower surface of the media is moved to the lowered position where the lower surface of the operating button 7 is in close contact with the bottom plate 1a, and the guide projection 7a is also slightly lowered and the floppy disk supported by it is also lowered. is lowered into position to properly cooperate with the lower recording/playback head. When the operation button 7 is released, the protrusion 7b similarly escapes from the recess 1b and lifts the operation button 7 and therefore the floppy disk supported thereby, so that no damage to the lower recording/reproducing head or the floppy disk occurs.

The oscillating carriage 23 is mounted with an upper recording head (not shown) that cooperates with the upper surface of the media in a position opposite the lower recording head, and is supported by a weak leaf spring 24.
It is swingably attached to the sliding carriage 19 by a weak leaf spring 25, and is biased downward by a weak leaf spring 25, as will be described later. An actuating plate 27 (FIG. 3) which is integral with the driven electromagnetic plunger 26 is pushed upward together with the plunger 26 by a compression spring 28 which is stronger than the leaf spring 25 when the plunger 26 is deenergized. When the protrusion 23a provided on the swing carriage 23 comes into contact with the upper surface of the actuating plate 27, the compression spring 28
, the swing carriage 23 is swung upward against the action of the weak leaf spring 25, and the upper recording/reproducing head attached thereto is separated from the upper surface of the floppy disk medium to be loaded. It is kept in the recording/playback disabled position. When the floppy disk is pushed into the recording/playback operating position, the operating button 7 is pushed in and locked by the locking member 8, and the media is being held and rotated by the cylinder 6 and the collet 12, the operating switch is turned on. When the electromagnetic plunger 26 is closed, the electromagnetic plunger 26 is energized, and the actuating plate 27 moves the plunger 2 against the action of the compression spring 28.
6, the projection 23a of the swinging carriage 23 can freely descend, and the action of the leaf spring 25 swings the swinging carriage 23 downward, so that the upper recording head is placed on the upper surface of the media. The recording/playback position is then moved toward the recording/playback position so that selective recording/playback of desired tracks on the top or bottom side of the media can be effected by operation of the control computer.

The above is a description of the overall operation, and next, the structure of each mechanical part will be explained in detail.

Cylinder Drive Mechanism As described above, the cylinder 6 and one large-diameter pulley 6a are interlocked via the belt 12 by the pulley 14 fixed to the shaft of the DC motor 13, for example.
The cylinder 6 is rotated by the rotation of the DC motor 13, but the speed of the DC motor 13 and therefore the speed of the cylinder 6 is kept constant by the strobe disk 15 integrated with the shaft of the DC motor 13.

Operation Button Lock Mechanism The operation button 7 is movable in the vertical direction in FIG. 1 along the machine frame 1 between a release position protruding from the position shown in the figure and a locking position pushed in as shown. , is normally biased to the protruding release position by a tension spring 30 stretched between a pin 29 provided on the machine frame 1 and a protrusion 7c provided on the operation button 7. As shown in FIG. 7, a roughly heart-shaped lock operation control groove 7d is formed into which a pin 8a implanted at one end of the lock member 8 is slidably fitted. The upper horizontal portion has U-shaped bent portions 7g, 7h, 7i, and 7j between both ends 7e and 7f, and the lower end has a V-shaped portion 7k that protrudes downward. However, the depth of the lower end 7l of the left groove of this V-shaped converging portion is deeper than the depth of the right groove 7m. The lock member 8 itself is the machine frame 1.
The lock member 8 is mounted on a pivot shaft 31 that freely moves in a long groove (not shown) of the operation button 7, and the coiled portion at the center is wound around the shaft 31 between the washer 32a and the lock member 8. The upper free end of a torsion compression coil spring 32 that presses the locking member 8 downward is attached to the upper free end of the locking member 8;
The lower free end is engaged with the guide member 5 so that the locking member 8 is pushed clockwise.
Therefore, the pin 8a of the locking member 8 is in the control groove 7d.
When the operating button 7 is in the protruding release position, the pin 8a is relatively located in the groove 7k at the lower end of the control groove 7d in FIG.
Because there is a difference in the depth of the bottom of the button 7, the operation button 7 is pushed downward to the locked position as shown by the solid line arrow, and when the pin 8a moves relatively upward, the solid line arrow shown in the groove always moves. The pin slides in the groove on the left side of the control groove 7d and is swung counterclockwise until it reaches the groove 7e.The pin immediately reaches the groove 7g due to the urging of the locking member 8 in the clockwise direction by the spring 32, and is not operated. When the button 7 is released, the operation button 7 is pushed back slightly by the action of the spring 30 as shown by the broken line arrow, and the pin 8a is pushed back.
is relative to the groove part 7 as indicated by the dashed arrow shown in the groove.
h, and is locked in the groove 7i, and at this position, the return of the operating button 7 is restricted, and the operating button 7 is locked in the locked position by the locking member 8. As mentioned above and will be described in detail below, when the operating button 7 is in this locked position, the setting member 11 is swung downward.
A collet 12 attached to the collet 1 engages with the cylinder 6, clamps the medium of the floppy disk between them, and rotates the medium as the cylinder 6 rotates.

Turn the operation button 7 into the seventh lock position as described above.
When the pin 8a is pushed in as shown by the dashed-dotted arrow in the figure, the pin 8a moves from the groove 7i through the groove 7j as shown by the dashed-dotted arrow in the groove, causing the lock member 8 to swing clockwise by the spring 32. reaches the groove 7f,
The operation button 7 is allowed to return to the release position in the direction of the arrow indicated by the two-dot chain line due to the action of the spring 30;
The pin 8a slides in the groove on the right side to the groove 7m as shown by the two-dot chain arrow in the groove, and is locked in the groove 7k by the final return movement of the operating button 7. Operation button 7
The above-mentioned cycle is repeated by pressing .

Collet Drive Mechanism An elongated notch 33 is formed in the operation button 7, and a recess (not shown) for swingably receiving the connecting member 9 is formed below the notch 33 of the operation button 7. , a rising bent portion 9b formed at the free end of the arm extending to the right in FIG. 1 of the connecting member 9 protrudes upward through the notch 33;
The other end of the compression spring 34, one end of which is locked to b, is locked to a pin 7n formed on the operation button 7, and the bent portion 9b of the connecting member 9 is cut out downward in the notch 33 in FIG.
It is energized so that it comes into elastic contact with the lower edge 33a of. The connecting member 9 itself is pivotally fixed to a pivot shaft 35 implanted in the machine frame 1. The previously described bent portion 9a (FIG. 3) of the connecting member 9 is a bent portion 11a (FIG. 3) extending downward at the center of the base of the set member 11.
When the operation button 7 is in the protruding release position, the connecting member 9 is swung counterclockwise, and the bending portion 9
a indicates the bent portion 1 of the set member 11 to the right in FIG.
Since it moves in the direction away from 1a, the setting member 11 is swung upward by the action of the leaf spring 10, and the collet 12 attached thereto is moved into the cylinder 6.
The floppy disk can be inserted freely.

When the operating button 7 is pushed in with the floppy disk inserted in the recording/reproducing position, the operating button 7 is locked in the locking position by the locking member 8 as described above, and in conjunction with this, the spring is released. 34, the connecting member 9 is swung clockwise, and the bending part 9a pushes the bending part 11a of the setting member 11, so that the setting member 11 moves downward against the action of the leaf spring 10. The collet 12 is swung, and the collet 12 is pressed toward the cylinder 6, holding the floppy disk medium in the middle, and causing the cylinder 6 to rotate the medium at a predetermined speed. When the operation button 7 is pressed again, the operation button 7 is returned to the release position as described above, so the interlocking member 9 is returned counterclockwise, the set member 11 is released and swung upward, and the collection 1
2 is separated from the cylinder 6, the media is released, and the floppy disk is automatically released by the action of the spring, as will be described later.

Recording/Reproducing Head Drive Mechanism As described above, the sliding carriage 19 supporting the lower recording/reproducing head is slidably supported by the guide rods 17, 18, and the swinging carriage 2 supporting the upper recording/reproducing head.
3 is swingably supported by the sliding carriage 19 by a weak leaf spring 24, and is lightly biased downward by a weak leaf spring 25.
The actuating plate 27 is normally pushed up by the compression spring 28 (Fig. 3) provided at 6, and the protrusion 23a provided on the swinging carriage 23 rests on this actuating plate 27, so that the swinging does not occur. The carriage 23 is swung upwardly by the action of the compression spring 28 against the action of the leaf spring 25 to move the upper recording head away from its cooperating position with the lower recording head.

The guide rods 17 and 18 are attached to the bottom plate 1a of the machine frame 1 and have a bent portion 36a extending upward from the support frame member 36.
The locking edges 37a, 37b in the opposing compression direction formed on the zigzag-shaped leaf spring washer 37 are fitted into the opposing guide rod receiving recesses 36b, 36c formed in FIG. 11, respectively. , 18, the guide rods 17 and 18 are respectively inserted into the guide rod receiving recess 3.
6b, 36c to ensure correct positioning. The opposite ends of the guide rods 17, 18 are held in exactly the same way. This method of fixing the guide rods 17 and 18 is extremely simple and suitable for automation. Already mentioned plunger 2
The upper end of the mounting support frame member 36 is slidably guided by a hole formed in an inverted L-shaped bent portion 36d extending upward from one side of the mounting support frame member 36.

A raised edge 19b is formed on the left side of the sliding carriage 19 in FIG. Although it is spaced apart from the circumference of the driving pulley 21 of 20, the pulley 2
1 is a guide rod 1 passing through the circular arc protrusion 19a in FIG.
The arrangement relationship is such that a straight line parallel to 7 is approximately in contact with the circumference of the pulley 21.

A J-shaped adjustment member 38 is attached to a portion 19c of the sliding carriage 19 outwardly from the raised edge 19b on the side where the arcuate protrusion 19a is located so that the tightening amount can be adjusted with an adjustment screw 39. Edge 1
An outer portion 19d opposite to the portion 19c of 9b
A thin leaf spring 40 having an arcuate curved portion 40a is shown in FIG.
is fixed by a set screw 41, and the above-mentioned pulley 2
The metal band 22, which is wound around the sliding carriage 19 and attached at both ends to the sliding carriage 19, has a shape as shown in FIG. The metal band 22 is fixed to the pulley 21 by screwing in a set screw 43, and as shown in FIG. The end portion 22c, which is wound and extended to the left and has a hole beyond the arcuate protrusion 19a, is held between the J-shaped adjustment member 38 and the portion 19c of the sliding carriage 19, and is tightened with the adjustment screw 39. Adjustable and fixed. The adjustment member 38 has a positioning hole 38a to prevent the position from shifting, into which a projection formed on the portion 19c of the sliding carriage 19 is fitted, or a separate fixing member is inserted to fix the position. It's getting old.

The part on the opposite side of the metal band 22 is a thin part 22
Two thin strips 2 are created by a long groove that is wider than b.
2d, and the pulley 21 is formed as shown in FIG.
The end portion 22e having a hole rotates to the right around the belt portion 22b, extends to the right so as not to interfere with the band portion 22b, and extends around the arcuate curved portion 40a of the leaf spring 40.
is sandwiched between the leaf spring 40 and the portion 19d of the sliding carriage 19 and fixed by a screw 41, and the elasticity of the leaf spring 40 applies appropriate tension to the metal band 22. The metal band 22 stretched between the arcuate projection 19a and the arcuate curved portion 40a of the leaf spring 40 is parallel to the guide groove 17.

Therefore, when the stepper motor 20 is rotated by a predetermined angle according to a command from the control computer, this rotational movement is caused by the raised edge 19b of the metal band 22.
The sliding carriage 19, together with the swinging carriage 23, is moved along the guide rods 17, 18 to switch the recording/reproducing head between desired tracks of the media.

In this case, depending on the conditions of the assembly operation at the desired initial position of the stepper motor 20, the recording/reproducing head may not be properly aligned with the predetermined track of the loaded media, and an adjustment operation is required to correct this. For this purpose, the desired adjustment can be made very easily by adjusting the degree of tightening of the J-shaped adjustment member 38 by the adjustment screw 39.

That is, in FIG. 9, when the pulley 21 is kept stationary at a predetermined position and the adjustment screw 39 is tightened, the band-shaped portion 22b is pulled in the direction of the adjustment member 38 beyond the arcuate protrusion 19a;
b itself remains stationary due to the pulley 21, so that the sliding carriage 19 is moved to the right relative to the recording/reproducing head so that it can be adjusted outward in the radial direction of the media and properly aligned with the desired track. By loosening the adjusting screw 39, adjustment can be made in the opposite direction.

In this case, since tension is applied to the metal band 22 by the leaf spring 40, the metal band 22 will not loosen even if the adjustment member 38 is adjusted to some extent, and correct track switching operation can be performed.

Now, the floppy disk is inserted into the correct loading position and is locked in the locking position by pressing the operation button 7, and the media is pressed and held against the cylinder 6 by the collector 12 and rotated, and then the floppy disk is operated. When the switch is closed to start the recording/reproducing operation, the plunger 26 is energized and the actuating plate 27 is activated.
is lowered against the action of the spring 28, and the protrusion 23a of the swinging carriage 23 is allowed to descend, so the swinging carriage 23 is swung downward by the action of the leaf spring 25, and the upper recording head is moved downward. The lower recording/reproducing head is disposed adjacent to and opposed to the lower recording/reproducing head, and is placed in a recording/reproducing operating position relative to the media to be clamped. At this time, a pad 27a (FIG. 5) provided on the lower surface of the operating plate 27 lightly presses the diskette of the floppy disk, thereby preventing vibration of the floppy disk and ensuring stable recording/reproducing operation.

Operation button lock release control mechanism The operation button 7 is locked in the locked position, the media of the floppy disk is rotated, the plunger 26 is energized by closing the operating switch, and the recording/playback head is placed in the recording/playback operating position relative to the media. If the operating button 7 is pressed in by mistake while the button is being moved, the locking action will be released and the operating button 7 will return to the release position.
Along with this, the set member 11 is released, the collet 12 is separated from the cylinder 6, and the floppy disk can be freely released, so that even though the recording/playing head is still in the recording/playing operation position, the floppy disk does not move as described above. is released by the action of the release spring,
This may damage the recording/playback head or floppy disk.

In order to prevent this, when the floppy disk is loaded, the operation button 7 is in the lock position, the plunger 26 is energized, and the recording/playback head is in the recording/playback operating position, even if the operation button 7 is pressed. A lock release control mechanism is provided in conjunction with the floppy disk release spring to reliably prevent the release operation.

1 and 8, the floppy disk release spring 44 is provided around the guide rod 18 in the form of a compression coil spring, and one end 44a is attached to the machine frame 1.
The other end 44b is engaged with the protrusion 45a of the lock control member 45 slidably guided on the guide rod 18, and presses the lock control member 45 in the direction of arrow A in FIG. It is energized clockwise around the guide rod 18 in the direction of arrow B. This lock control member 45 is formed with a lock control tongue 45b that extends above the lock member 8, and this lock control tongue 45b comes into contact when the actuating plate 27 is lowered by the urging force of the plunger 26. The plunger 2 has an abutting edge 45c that abuts to prevent the lock control tongue 45b from swinging counterclockwise.
When the lock control member 6 is deenergized, the actuating plate 27 rises, allowing the lock control member 45 to swing freely in the counterclockwise direction. This lock control tongue 45
b is in the chain line position in Figure 1 when the floppy disk is not inserted, and is pushed by the diskette of the floppy disk to the solid line in Figure 1 when the floppy disk is inserted and moved to the recording/playback operating position. At this position, an inclined cam edge 45d is formed which is engaged with a step 8b on the edge of the locking member 8 opposite to the pin 8a.

Therefore, the floppy disk is pushed into the recording/playback operating position, and the tongue 45 of the lock control member 45
b is pushed against the action of the spring 44 and the tongue piece 45
When the plunger 26 is not energized and the operating button 7 is pushed in and locked with the cam edge 45d of the locking member 8 being engaged with the stepped portion 8b of the locking member 8, the operating plate 27 is in the raised position. Since it is separated from the contact edge 45c of the tongue piece 45b, when the operation button 7 is pushed in to release the lock member 8, the lock member 8 is swung clockwise by the action of the control groove 7d. The tongue piece 45b can freely swing counterclockwise by the edge 45d, allowing the lock member 8 to swing clockwise, and the tongue piece 45b is released from the lock by the lock member 8 and can freely press the operation button. Once released by 7, the collet 12 can be released and the floppy disk can be released by the spring 44. However, when the plunger 26 is energized and the recording/reproducing operation is performed, the actuating plate 27 is lowered and the tongue piece is released. Contact edge 4 of 45b
5c to prevent the tongue piece 45b from swinging counterclockwise, the cam edge 45d will not move the step 8b even if the lock member 8 is to be rocked clockwise by releasing the operation button 7. This locks and prevents the lock member 8 from swinging clockwise, thereby preventing the release of the operation button 7, the release of the collet 12, and the release of the tongue piece 45b from the lock member 8. Ejection of the floppy disk is reliably prevented.

From the above description, the structure and operation of the floppy disk device of the present invention are clear, and it can be seen that a floppy disk device with a simple structure, reliable operation, and thin external dimensions has been provided.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the main parts of a floppy disk device incorporating the present invention. FIG. 2 is a side view taken in the direction of the arrow in FIG. 1. FIG. 3 is a side view of the main parts seen in the direction of the arrow in FIG. Fig. 4 is an enlarged view of the part surrounded by the chain line in Fig. 3. FIG. 5 is a side view of the main part in the direction of the arrow in FIG. 6 is a side view of the main part in the direction of the arrow in FIG. 1; FIG. FIG. 7 is an explanatory diagram of the control groove of the operation button. FIG. 8 is a perspective view of the lock control member. FIG. 9 is a perspective view showing a drive pulley of the stepper motor and a portion of the sliding carriage. Figure 10 is a developed view of the metal band. FIG. 11 is a side view showing a washer for fixing the guide rod. 1...Machine frame, 2...Bottom plate, 6...Cylinder,
7...Operation button, 8...Lock member, 11...Set member, 12...Collection, 13...DC motor, 17, 18...Guide rod, 19...Sliding carriage, 20...Stepper motor, 21... Drive pulley, 22... Metal band, 23... Rocking carriage, 26... Electromagnetic plunger, 27... Actuation plate, 38... Adjustment member, 39... Adjustment screw, 45
...Lock control member.

Claims (1)

[Claims] 1 By pressing the operation button in the release position,
The operating button is locked in a locking position that holds the floppy disk inserted in the recording/reproducing position in the recording/reproducing operating position, and the locking is performed by pushing the operating button in the locking position. a locking member that is swung in cooperation with a control groove provided in the operating button so as to release the operating button and return the operating button to the release position where the floppy disk can be ejected;
The floppy disk, which is energized by the operation of the recording/playing switch and held in the recording/playing position, is moved through an opening provided at a predetermined position in the diskette of the floppy disk to opposite sides of the media in the diskette and placed in the recording/playing disabled position. an electromagnetic device for activating the carriage to move and hold the supported recording/playback head in the recording/playback operative position, and for returning the carriage to the recording/playback inactive position of the recording/playback head by being deenergized. The floppy disk device includes a swingable lock control member that is brought into contact with the diskette of the floppy disk and moved to an engagement position with the lock member in conjunction with a loading operation of the floppy disk, and the lock control member The member is arranged such that when the electromagnetic device is energized, it is restrained by an actuating plate integrally provided to the electromagnetic device and prevented from swinging, and a cam edge is provided at the engaging portion with respect to the locking member. When the operating button is pressed in the locking position while the electromagnetic device is deenergized, the cam edge is moved when the locking member swings to release the operating button. The lock control member is swung by the lock control member to enable the release operation of the lock member, but when the operation button in the locking position is pressed while the electromagnetic device is energized, the operation plate is activated. Since the lock control member is prevented from swinging, the cam edge is configured to prevent the lock member from swinging to perform the release operation, thereby making the release operation impossible. A floppy disk device featuring: