JP4464320B2 - Intermittent rotation drive device for printer and intermittent rotation drive device - Google Patents

Description

  The present invention relates to an intermittent rotation drive device and an intermittent rotation drive device for a printer, and more specifically, an intermittent rotation drive device and an intermittent rotation drive for a printer provided with a pickup roll that intermittently rotates to pick up sheets one by one from a sheet stocker. Relates to the device.

  The printer includes a pick-up roll that picks up one sheet from a large number of sheets stacked on a sheet stocker and sends it to a printing unit such as an ink jet. This pick-up roll is connected to an intermittent rotation driving device, and a roll main body having a D shape in a side view is intermittently rotated. Pick up.

  For example, the toothless gear connected to the shaft of the pick-up roll is meshed and driven by the drive gear, and the locking member that advances and retreats by the solenoid engages the claw portion formed on the toothless gear, whereby the rotation of the toothless gear is temporarily performed. There is known an apparatus in which the pickup roll is intermittently rotated (see, for example, Patent Document 1 to Patent Document 3).

  Further, there is known a clutch device in which a finger hook portion is formed on the locking lever so that the locking lever can be manually moved when the locking lever that engages the toothless gear is not attracted well by the solenoid ( For example, see Patent Document 4).

JP 2000-310311 A JP 7-228368 A JP-A-6-50406 JP 2001-65598 A

  As described above, the intermittent rotation drive device for intermittently rotating the pick-up roll often uses a combination of a drive gear and a missing gear, and meshes when the missing tooth portion of the missing gear reaches the drive gear position. Is removed, and the rotation of the pickup roll is stopped.

  In order to resume the rotation of the pick-up roll that has been once disengaged and stopped, it is necessary to forcibly rotate the missing gear, and a clutch device that uses the spring force of the spring is used as a device for that purpose. It is done.

  For example, in the devices described in Patent Literature 1 and Patent Literature 4, a cam portion is formed integrally with the toothless gear, a pressing lever extending from the fixed (housing) side is brought into contact with the cam portion, and the pressing lever The toothless gear is configured to rotate by an urging force. In other words, while the toothless gear and the drive gear are engaged, the amount of bending of the pressing lever is increased by the cam portion by rotating the toothless gear, but the toothless portion of the toothless gear is brought to the drive gear position. When it reaches and the state where both mesh with each other is released, the pressing lever cancels the bending, pushes back the cam portion, and forcibly rotates the toothless gear. The start timing of forced rotation of the toothless gear by the pressing lever is taken by releasing the locking by the locking member.

  On the other hand, as shown in FIGS. 5 and 6, another segmented gear (second segmented gear) 52 is provided coaxially with the shaft 51s of the segmented gear (first segmented gear) 51. There has been known a clutch device that uses the elastic force of a spring 50 provided between the toothless gears to restart the rotation of the first toothless gear 51 that has been temporarily stopped.

  That is, this clutch device is provided with a second toothless gear 52 that is rotatable with respect to the first toothless gear 51, both of the toothless gears mesh with the drive gear 53, and these toothless sections 51a, 52a. Is the phase advanced in the missing tooth section 52a of the second missing gear than in the missing tooth section 51a of the first missing gear, and in the direction of the missing tooth section 52a of the second missing gear. Are combined with a phase difference so as to reach the position of the drive gear 53 early. The second toothless gear 52 is forcibly stopped by a locking claw 54 that is engaged and disengaged by a solenoid when the toothless section 52a reaches the position of the drive gear 53, and the first toothless gear 52 51 continues to rotate while reducing the phase difference even after the second toothless gear 52 is stopped, so that when the toothless section 51a reaches the position of the drive gear 53, the mesh is disengaged and stopped. It is configured. The drive gear 53 rotates in the direction of arrow Ra, and the first and second toothless gears 51 and 52 rotate in the direction of arrow Rb.

  Between the first and second toothless gears 51 and 52, there is provided a compression spring 50 that is compressed in the process of reducing the phase difference and accumulates the elastic force. When the rotation of the toothed gear 51 is resumed, first, the locking claw 54 is disengaged and the second segmented gear 52 is freed, the elastic force accumulated in the compression spring 50 is released, and the second segmented tooth is released. The gear 52 rotates and resumes meshing with the drive gear 53, catches up with the first toothless gear 51 and presses the first toothless gear 51 in the forward rotation direction (drive of the first toothless gear 51). Engagement with the gear 53 is promoted). In FIG. 6, the second side gear 52 on the near side is omitted.

  In the clutch device described above, compared to the devices described in Patent Document 1 and Patent Document 4, it is necessary to form a precise cam portion in the missing gear (first missing gear) 51 itself, or a fixed (chassis). There is no restriction that a pressing lever has to be provided on the body) side, and there is an advantage that it is suitable for a printer device with a small space, but on the other hand, there are the following problems.

  That is, the elastic force of the compression spring 50 compressed in the process of reducing the phase difference between the first and second toothless gears 51 and 52 is shown in FIG. It applies in the direction B, and the first partial gear 51 is applied in the direction of arrow A in FIG. Here, since the second toothless gear 52 is locked by the locking claw 54, it is also reliably stopped (fixed) by the elastic force in the direction of arrow B. However, since the first partial gear 51 is not supported by other members, the following trouble occurs when the elastic force in the direction of arrow A is applied.

  That is, since the force (arrow A) in the direction opposite to the rotation direction (arrow Rb) by the drive gear 53 is acting on the first toothless gear 51, When the tooth section 51a reaches the position of the drive gear 53, the tooth 51t immediately before the missing tooth section 51a and the tooth of the drive gear 53 may interfere with each other and generate noise (FIG. 6).

  In view of this, the present invention provides another segmented gear (second segmented gear) coaxially with the axis of a segmented gear (first segmented gear) for outputting intermittent rotational driving force, In an intermittent rotation drive device that uses a spring force provided between gears to resume rotation of a first intermittent gear that has been stopped, the teeth of the first intermittent gear and the teeth of the drive gear It is an object of the present invention to provide an intermittent rotation driving device and an intermittent rotation driving device for a printer that can prevent occurrence of abnormal noise without causing interference with the printer.

  In order to achieve the above-mentioned object, the invention of claim 1 comprises a drive gear, a first intermittent gear meshed with the drive gear, the rotation shaft of which is connected to the shaft of a paper pick-up roll, Engaged with the drive gear, is rotatable about the same rotation axis as the rotation axis of the first toothless gear, and the missing tooth section is advanced from the missing tooth section of the first missing gear. A second toothless gear combined with a phase difference so as to be in phase, and a compression provided between the first and second toothless gears and compressed by the reduction of the phase difference to accumulate an elastic force A spring and rotation stop means for selectively stopping or releasing the rotation of the second toothless gear by being engaged with or disengaged from the second toothless gear; Forced by the rotation stop means when the tooth section reaches the drive gear position The first toothless gear continues to rotate while reducing the phase difference even after the second toothless gear stops, and the toothless section reaches the drive gear position. It is configured so that the engagement is sometimes released and stopped, the stop by the rotation stopping means is released, and the second partial gear is rotated by releasing the elastic force of the compression spring, so that the phase difference is restored. When the phase difference of the second partial gear returns to the first partial gear, the second partial gear abuts against the first partial gear and rotates the stopped first partial gear, A printer configured to resume meshing with the drive gear, rotating the drive gear, and controlling the engagement and disengagement of the rotation stop means with the second intermittent gear to intermittently rotate the pickup roll In the intermittent rotation drive device, the drive A large-diameter cylindrical portion is formed coaxially and integrally with the vehicle, and has elasticity in the direction of opening toward the outer periphery in the vicinity of the tooth-missing section on the side surface of the first tooth-missing gear. A leaf spring portion in contact therewith, and when the first toothless gear is rotated by the drive gear and the toothless section reaches the drive gear position, the leaf spring portion contacts the cylindrical portion; The first toothless gear is rotated forward by elasticity, the tooth immediately before the tooth missing section of the first toothless gear and the tooth of the driving gear are separated, and the interference between the two is prevented. It is characterized by that.

According to a second aspect of the present invention, there is provided a drive gear, a first intermittent gear meshed with the drive gear, the rotation shaft of which is an intermittent rotation output shaft, meshed with the drive gear, and the first gear. It is made rotatable about the same rotation axis as the rotation axis of the missing gear, and is combined with a phase difference so that the missing tooth section has a phase advanced from the missing tooth section of the first missing gear. A second partial gear, a compression spring provided between the first and second partial gears, which is compressed by the reduction of the phase difference and accumulates an elastic force, and the second partial gear Rotation stop means for selectively stopping or canceling the rotation of the second gear, and the second partial gear is forcibly stopped by the rotation stop means when the partial tooth section reaches the drive gear position. And the first segmented gear after the second segmented gear is stopped Wherein continue to rotate while reducing the phase difference, the meshing when the toothless section has reached the drive gear position is configured to stop off also,
When the stop by the rotation stopping means is released and the second segmented gear is rotated by releasing the elastic force of the compression spring, the phase difference returns to the original phase difference. A toothed gear abuts on the first segmented gear, and the stationary first segmented gear is rotated in the forward direction so that the meshing between the first segmented gear and the drive gear is resumed. And an intermittent rotation drive device that rotates the drive gear and intermittently rotates the rotation shaft of the first partial gear by selectively stopping or releasing the second partial gear by the rotation stopping means. The driving gear is provided with a cylindrical portion coaxially and integrally, the first segmented gear is provided with an elastic member having elasticity in the outer peripheral direction and the tip of which is in contact with the cylindrical portion, 1 toothless gear is rotated by the drive gear, When the tooth section reaches the drive gear position, the elastic member comes into contact with the cylindrical portion, and the elastic force of the elastic member causes the first segmented gear to rotate forward, and the segmented section of the first segmented gear. The tooth immediately before is separated from the teeth of the drive gear.

  According to a third aspect of the present invention, in the second aspect of the present invention, the elastic member is made of a synthetic resin formed integrally and projecting from a side surface of the first partial gear.

  According to the first aspect of the present invention, another segmented gear (second segmented gear) is coaxial with the axis of the segmented gear (first segmented gear) for outputting the intermittent rotational driving force of the pickup roll. A first segmented gear that is temporarily stopped using the elastic force of a spring provided between the segmented gears. In the intermittent rotation drive device of the printer that causes the rotation to be restarted, the interference between the teeth of the first partial gear and the teeth of the drive gear does not occur, and the generation of abnormal noise can be prevented.

  According to the second and third aspects of the present invention, another segmented gear (second segmented gear) is coaxial with the axis of the segmented gear (first segmented gear) for outputting intermittent rotational driving force. ), Combining them so that the phases of the tooth missing sections of the both tooth missing gears are different, and using the elastic force of the spring provided between the two tooth missing gears, the first tooth missing once stopped In the intermittent rotation drive device for resuming the rotation of the gear, the interference between the teeth of the first partial gear and the teeth of the drive gear does not occur, and the generation of abnormal noise can be prevented.

  Hereinafter, a printer and an intermittent rotation driving device for a pickup roll thereof according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. As shown in FIG. 1, the printer 1 according to the present embodiment is an ink jet printer including an ink jet printing device 2, and includes a paper supply device 3, a feed roller device 4, and the like from the upstream side of the printing device 2. In addition, a sheet of paper P supplied from the paper supply device 3 is sent to the printing device 2 through the feed roller device 4 and printed.

  The paper supply device 3 includes a paper stocker 5 on which a large number of papers P are stacked, and a pickup roll 6 that picks up the uppermost sheet from the paper in the paper stocker 5. The pickup roll 6 will be described in detail later. The roll main body 7 which is connected to the intermittent rotation driving device and has a D-shaped side view is rotated intermittently in the direction of the arrow. The roll main body 7 contacts the surface of the paper, and the uppermost paper is fed one by one. It is designed to send it forward.

  The intermittent rotation drive device 8 will be described with reference to FIGS. The intermittent rotation drive device 8 is engaged with a drive gear 10 driven by a motor (not shown), and a first toothless gear 11 having a rotation shaft 11 s connected to the shaft of the pickup roll 6. And a second partial gear 12 that is rotatable about the same rotational axis as the rotational axis 11 s of the first partial gear 11 and meshed with the drive gear 10, and a second partial gear 12. And a rotation stop device 13 that selectively engages or disengages the rotation of the second toothless gear 12 with respect to the cam portion 12c. The drive gear 10 rotates in the direction of arrow Ra, and the first and second toothless gears 11 and 12 rotate in the direction of arrow Rb.

  When the first and second partial gears 11 and 12 are rotated by the drive gear 10, the partial tooth section 12 a of the second partial gear 12 is in the partial section of the first partial gear 11. They are combined with a phase difference so as to reach the position of the drive gear 10 earlier than 11a. The amount of the phase difference changes with the progress of the intermittent rotation driving operation. Specifically, it will be described in detail later in the explanation of the operation.

  The rotation stopping device 13 includes a locking claw 15 biased in a direction to engage with the cam portion 12c by a spring 14 and a solenoid 16 that attracts the locking claw 15, and the solenoid 16 is excited at an appropriate timing. Then, the locking claw 15 is attracted to the solenoid 16 so that the engagement with the cam portion 12c is released.

  The second segmented gear 12 is forcibly stopped by the rotation stopping device 13 when the segmented section 12a reaches the position of the drive gear 10, and the first segmented gear 11 is a second segmented tooth. Even after the gear 12 is stopped, the rotation is continued while reducing the phase difference, and when the missing tooth section 11a reaches the position of the drive gear 10, the engagement is disengaged and the gear 12 is stopped.

  Then, between the first and second toothless gears 11 and 12, one end is fixed to the first toothless gear 11 side, the other end is fixed to the second toothless gear 12 side, and the phase difference A compression spring 17 is provided which is compressed by reduction. The first and second partial gears 11 and 12 have a second partial gear 12 side when the phase difference is reduced and then returned (when the compression spring 17 changes from reduction to extension). Contact members 11d and 12d that contact the first toothless gear 11 side from the first side.

  Here, with reference to FIG. 4, operation | movement of the 1st and 2nd part-tooth gear 11 and 12 by the drive gearwheel 10 is demonstrated. FIG. 4A to FIG. 4D show the states of the first segmented gear 11 and the second segmented gear 12 at the same time point, respectively.

  In the state shown in FIG. 4A in which the first and second partial gears 11 and 12 are both meshed with the drive gear 10, both the first and second partial gears 11 and 12 rotate at a constant speed. The pickup roll 6 connected to the shaft of the first partial gear 11 rotates to feed the paper P forward.

  Then, when the missing tooth section 12a of the second toothless gear 12 having advanced phase reaches the position of the drive gear 10, the locking claw 15 of the rotation stopping device 13 is locked to the cam portion 12c, and the second missing tooth gear 12c. The rotation of the tooth gear 12 is stopped (FIG. 4B). At this time, the missing tooth section 11a of the first missing gear 11 has not yet reached the position of the drive gear 10, so that the first missing gear 11 continues to rotate.

  As the rotation of the first toothless gear 11 continues, the phase difference between the two toothless gears is reduced, and the compression spring 17 is compressed accordingly, and the elastic force is accumulated (FIG. 4C). The first segmented gear 11 is disengaged and stopped when the segmented section 11a reaches the position of the drive gear 10. The pickup roll 6 is also stopped when the first toothless gear 11 is stopped, and the sheet pickup operation is stopped.

  After that, when the locking claw 15 of the rotation stop device 13 is disengaged from the cam portion 12c and the second partial gear 12 becomes free, the second partial gear 12 is moved by the elastic force accumulated in the compression spring 17. Energized in the forward rotation direction, the meshing of the second partial gear 12 and the drive gear 10 is resumed, and the second partial gear 12 starts to rotate again (FIG. 4 (d)). Then, the contact member 12d on the second toothless gear 12 side catches up with the contact member 11d on the first toothless gear 11 side, and the first toothless gear 11 is moved in the forward rotation direction. Then, the first partial gear 11 is engaged with the drive gear 10 again, and the rotation is resumed.

  The operation of the first and second toothless gears 11 and 12 by the drive gear 10 is as described above, and when the compression spring 17 is contracted (FIG. 4C), the toothless section 11a becomes the drive gear. A force in the reverse rotation direction (arrow A) is applied to the first toothless gear 11 that has reached the position 10 by an elastic force of the compression spring 17. As a result, interference is likely to occur between the tooth 11t immediately before the toothless section 11a of the first toothless gear 11 and the tooth of the drive gear 10, but in the present embodiment, the following structure is provided. Therefore, the interference is prevented.

  As shown in the rear view in FIG. 3, a large-diameter cylindrical portion 21 is formed coaxially and integrally with the drive gear 10, and in the vicinity of the missing tooth section 11 a on the side surface of the first missing gear 11, A leaf spring portion 22 is formed which has elasticity in a direction to open to the outer periphery and a tip 22 a of which contacts the cylindrical portion 21. The first partial gear 11 and the leaf spring portion 22 are both made of synthetic resin and formed integrally. The distal end 22 a side of the leaf spring portion 22 is curved so as to smoothly come into contact with the cylindrical portion 21.

  Next, the operation of the cylindrical portion 21 and the leaf spring portion 22 will be described with reference to FIGS. 3 and 4. That is, when the first partial gear 11 is further rotated from the state shown in FIG. 4B, the tip of the leaf spring portion 22 approaches the cylindrical portion 21 and comes into contact therewith. At this time, the leaf spring portion 22 is slightly bent in the inner circumferential direction and accumulates elasticity. When the first toothless gear 11 is further rotated, the toothless section 11a reaches the position of the drive gear 10, the meshing is disengaged, and at the same time the tip 22a of the leaf spring part 22 exceeds the cylindrical part 21, The leaf spring portion 22 tries to open in the outer circumferential direction due to its elasticity (arrow r in FIG. 4C). The reaction force thereby acts as a rotational force in the forward rotation direction on the first toothless gear 11, and between the tooth 11 t immediately before the toothless section 11 a of the first toothless gear 11 and the tooth of the driving gear 10. An interval is generated and interference between the two is prevented.

  In the present embodiment, the first segmented gear 11 and the leaf spring portion 22 are both made of synthetic resin and formed integrally, so that the production is easy, and the leaf spring portion 22 for the first segmented gear 11 is easy. If the formation position is accurately manufactured, the timing at which the leaf spring portion 22 causes the rotation action of the first partial gear 11 in the normal rotation direction can be easily and accurately performed.

  That is, the timing at which the rotation action in the forward rotation direction is applied to the first toothless gear 11 is the position where the toothless section 11a of the first toothless gear 11 is located at the position of the drive gear 10, as shown in FIG. However, in this embodiment, since the leaf spring portion 22 is integrally molded with the first toothless gear 11, the leaf spring is required. If the portion 22 is provided at a predetermined position in the vicinity of the missing tooth section 11a, the leaf spring portion 22 inevitably acts on the cylindrical portion 21 at the correct timing, and the first missing gear 11 is rotated in the forward rotation direction. give.

  In the present embodiment, the elastic member that acts on the cylindrical portion 21 of the drive gear 10 is configured by the leaf spring portion 22. However, as another embodiment, other shapes such as a coil spring are used instead of the leaf spring portion 22. May be used.

  In any case, in the intermittent rotation driving device of the present invention, when the missing tooth section 11a of the missing gear (first missing gear) 11 reaches the position of the driving gear 10 and is disengaged, the first Due to the resilient force of the compression spring 17 acting on the partial gear 11, a force in the reverse direction acts on the first partial gear 11, and the tooth 11 t immediately before the partial gear section 11 a and the drive gear 10. It is possible to prevent teeth from interfering with each other.

1 is a schematic side view of a printer including an intermittent rotation driving device according to an embodiment of the present invention. The side view of the intermittent rotation drive device. The perspective view which looked at the intermittent rotation drive device from the back. Explanatory drawing which shows operation | movement of the intermittent rotation drive device. The perspective view which shows the conventional intermittent rotation drive device. The front view which shows the operation state of the conventional intermittent rotation drive device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Printer 6 Pickup roll 8 Intermittent rotation drive device 10 Drive gear 11 1st missing tooth gear 11a Tooth missing section 11s Rotating shaft 11t Teeth immediately before the missing tooth section 12 Second missing tooth gear 12a Notched tooth section 12c Cam part 13 Rotation Stop Device 15 Locking Claw 17 Compression Spring 21 Cylindrical Part 22 Leaf Spring Part 22a Tip

Claims (3)

A drive gear,
A first intermittent gear meshed with the drive gear, the rotation shaft of which is connected to the shaft of a paper pickup roll;
Engaged with the drive gear, is rotatable about the same rotation axis as the rotation axis of the first toothless gear, and the tooth missing section is ahead of the tooth missing section of the first tooth missing gear. A second toothless gear combined with a phase difference so as to be in phase,
A compression spring provided between the first and second toothless gears, which is compressed by the reduction of the phase difference and accumulates an elastic force;
A rotation stopping means that engages with and disengages from the second toothless gear, and selectively stops or releases the rotation of the second toothless gear;
The second segmented gear is forcibly stopped by the rotation stopping means when the segmented section reaches the drive gear position, and the first segmented gear is the second segmented gear. The rotation is continued while reducing the phase difference even after stopping, and when the missing tooth section reaches the drive gear position, the engagement is disengaged and stopped.
When the stop by the rotation stopping means is released and the second segmented gear is rotated by releasing the elastic force of the compression spring, the phase difference returns to the original phase difference. The toothed gear abuts on the first segmented gear, rotates the stationary first segmented gear, and resumes meshing between the first segmented gear and the drive gear. ,
In the intermittent rotation driving device of the printer that rotates the drive gear and controls the engagement and disengagement of the rotation stop unit with the second intermittent gear to intermittently rotate the pickup roll.
A large-diameter cylindrical portion is formed coaxially and integrally with the drive gear,
In the vicinity of the toothless section on the side surface of the first toothless gear, there is provided a leaf spring portion that has elasticity in the direction to open to the outer periphery, and the tip of which contacts the cylindrical portion,
When the first segmented gear is rotated by the drive gear and the segmented section reaches the position of the drive gear, the leaf spring portion abuts on the cylindrical portion, and the elastic force causes the first segmented gear. A printer configured to prevent the interference between both teeth by rotating a tooth gear forward, separating a tooth immediately before a tooth missing section of the first toothless gear and a tooth of the driving gear. Intermittent drive device. A drive gear,
A first intermittent gear meshed with the drive gear, the rotation shaft of which is an intermittent rotation output shaft;
Engaged with the drive gear, is rotatable about the same rotation axis as the rotation axis of the first toothless gear, and the tooth missing section is ahead of the tooth missing section of the first tooth missing gear. A second toothless gear combined with a phase difference so as to be in phase,
A compression spring provided between the first and second toothless gears, which is compressed by the reduction of the phase difference and accumulates an elastic force;
Rotation stopping means for selectively stopping or releasing the rotation of the second partial gear,
The second segmented gear is forcibly stopped by the rotation stopping means when the segmented section reaches the drive gear position, and the first segmented gear is the second segmented gear. The rotation is continued while reducing the phase difference even after stopping, and when the missing tooth section reaches the drive gear position, the engagement is disengaged and stopped.
When the stop by the rotation stopping means is released and the second segmented gear is rotated by releasing the elastic force of the compression spring, the phase difference returns to the original phase difference. A toothed gear abuts on the first segmented gear, and the stationary first segmented gear is rotated in the forward direction so that the meshing between the first segmented gear and the drive gear is resumed. And
In the intermittent rotation drive device that rotates the drive gear and selectively stops or cancels the second segmented gear by the rotation stopping means to intermittently rotate the rotation shaft of the first segmented gear,
A cylindrical portion is provided coaxially and integrally with the drive gear,
The first segmented gear has an elastic member that has elasticity in the outer peripheral direction and whose tip abuts against the cylindrical portion;
When the first toothless gear is rotated by the driving gear and the toothless section reaches the position of the driving gear, the elastic member comes into contact with the cylindrical portion, and the elastic force causes the first toothless tooth. An intermittent rotation driving device characterized in that a gear is rotated forward so that a tooth immediately before a tooth missing section of the first toothless gear is separated from a tooth of the driving gear.   3. The intermittent rotation drive device according to claim 2, wherein the elastic member is made of a synthetic resin integrally protruding from a side surface of the first toothless gear.

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