JP2010018368A - Recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To further improve throughput in a recording device provided with a power transmission switching means switching ON/OFF of power transmission from a conveying roller to a feeding roller. <P>SOLUTION: A power transmission switching device 30 switches ON/OFF of power transmission from a first rotating body 31 normally rotating according to rotation of a PF motor 20 to a second rotating body 32 connected to the feeding roller 4 by switching engagement/disengagement of a tooth part 33a and a clutch gear part 31b according to oscillation of a clutch member 33. A plunger 39 provided in a solenoid device 35 can be engaged/disengaged to/from a clutch engaging part 33b of the clutch member 33. By an advancing/retreating operation of the plunger 39, ON/OFF of power transmission is switched. The solenoid device 35 is constituted to be independent from a driving system by the PF motor 20. The ON/OFF of power transmission of the power transmission switching device 30 is switched without interposing a reversing operation of the PF motor 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a recording apparatus that performs recording on a recording medium, and more particularly to a recording apparatus that includes a power transmission switching unit that performs on / off switching of power transmission from a conveyance roller to a feeding roller.

  A printer as an example of a recording apparatus includes a feeding device that feeds a recording sheet to a downstream conveyance roller by a feeding roller. In such a printer, the power of the drive motor may be configured to be transmitted to the feeding roller via the transport roller, that is, the power source may be shared to reduce the cost of the apparatus.

However, even after the feeding operation of the recording paper is completed, if the feeding roller rotates, double feeding of the recording paper is caused. Therefore, the feeding roller needs to be selectively driven only when necessary. Patent Documents 1 and 2 describe a power transmission switching device (clutch) that performs such power transmission on / off switching.
JP 2004-17580 A JP 2003-267567 A

  In the above conventional power transmission switching device (clutch), the power transmission is switched on and off through the rotation direction switching of the motor as a drive source. That is, when the power transmission from the transport roller to the feed roller is turned off, if the transport roller is switched from forward rotation to reverse rotation, the power transmission is switched on and the feed roller is fed along with the forward rotation of the transport roller. The roller is in a normal rotation state. When the feeding roller makes one rotation in the forward rotation direction, the power transmission from the transport roller is switched off. Such an operation results from the fact that the trigger means that forms the trigger for switching on / off the power transmission is constituted by a lever member that swings with the rotation of the transport roller.

  However, in recent years, a further improvement in throughput is desired in the recording apparatus, and in the power transmission switching device configured as described above, it is necessary to interpose a reverse rotation of the conveying roller when feeding the paper. This is an obstacle to improving throughput.

  Therefore, the present invention has been made in view of such a situation, and an object of the present invention is to provide a recording apparatus including power transmission switching means for switching on / off power transmission from the conveying roller to the feeding roller. The purpose is to improve throughput.

  In order to solve the above problems, a recording apparatus according to a first aspect of the present invention includes a recording unit that performs recording on a recording medium, a conveying roller that conveys the recording medium, and a drive source of the conveying roller. A drive motor that feeds the recording medium to the transport roller by receiving power from the drive motor via the transport roller, and power transmission from the transport roller to the feed roller Power transmission switching means for performing on / off switching of the power transmission switching means, wherein in the power transmission switching means, trigger means for forming a trigger for on / off switching of the power transmission is configured independently of a drive system driven by the drive motor It is characterized by being.

  According to this aspect, in the power transmission switching means, the trigger means for forming the trigger for switching on / off of power transmission is configured independently of the drive system driven by the drive motor. The power transmission can be switched on and off without intervening the reverse operation of the (conveying roller), and thus further throughput improvement can be achieved.

  The recording apparatus according to a second aspect of the present invention is the recording apparatus according to the first aspect, wherein the power transmission switching means includes a clutch gear that always rotates as the conveying roller rotates, and a tooth portion that can mesh with the clutch gear. And a clutch member that switches between a power transmission on state in which the tooth portion meshes with the clutch gear and a power transmission off state in which the tooth portion separates from the clutch gear. The clutch member is swingably supported and when the clutch member is in the power transmission on state, power is transmitted from the clutch gear via the clutch member to the feeding roller. A transmitted member that transmits rotational torque, and the clutch member together with the clutch member, the clutch member being engaged with the clutch gear. Urging means for urging in the direction to be engaged, and a constrained portion provided in the clutch member can be engaged and disengaged. By engaging with the constrained portion, the clutch member transmits the power. A trigger member that constitutes the trigger means, and holds the clutch member from the power transmission on state to the power transmission off state by engaging the trigger member with the constrained portion. The clutch member is configured to switch from the power transmission off state to the power transmission on state when the trigger member is disengaged from the restrained portion.

  According to this aspect, the power transmission switching means can be simplified in structure and reduced in cost by the clutch gear, the clutch member, the transmitted member, the urging means, and the trigger member. .

  A recording apparatus according to a third aspect of the present invention is the recording apparatus according to the second aspect, further comprising a plunger constituting the trigger member, wherein the trigger means moves forward and backward in accordance with switching between energization and deenergization of the electromagnetic coil. And a regulated member provided on the plunger when the plunger operates from the advance position to the retract position. The solenoid includes a solenoid configured and a support member formed of a resin material that supports the solenoid. The retracted position restricting portion for restricting the retracted position of the plunger in contact with the plunger is integrally provided with a resin material on the support member.

  According to this aspect, the trigger means is constituted by a solenoid provided with a plunger, and when the plunger operates from the advance position toward the retreat position, the plunger comes into contact with the regulated portion provided on the plunger. Since the retraction position restricting part that restricts the retreat position of the solenoid is integrally provided with the support member that supports the solenoid by a resin material, by disposing the solenoid on the support member, undesirable metal noise generated when the plunger is retracted is reduced. Or the silencing structure for prevention will be comprised, and the said silencing structure can be arrange | positioned at low cost.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. Here, FIG. 1 is a side sectional view of an ink jet printer (hereinafter referred to as “printer”) 1 which is an embodiment of a recording apparatus according to the present invention, and FIG. 2 shows power from the conveyance drive roller 11 to the power transmission switching device 30. FIGS. 3A and 3B are plan views (operation explanatory diagrams) of the power transmission switching device 30, and FIGS. 4 and 5 are perspective views (operation explanatory diagrams) of the solenoid device 35. is there.

In the following, first, the configuration of the printer 1 will be outlined with reference to FIG. In the following description, the left direction (front side of the printer) in FIG. 1 is referred to as “downstream side” of the paper transport path, and the right direction in FIG. 1 is referred to as “upstream side”.
The printer 1 is provided with a feeding device 2 capable of setting recording paper (mainly cut sheet paper: hereinafter referred to as “paper P”) as an example of a “recording medium” in an inclined posture at the rear portion. 2 includes a hopper 3, a feeding roller 4, and a retard roller 6.

  The hopper 3 is provided so as to be able to oscillate about an upper oscillating fulcrum (not shown). By oscillating, the sheet P supported in an inclined attitude on the hopper 3 is pressed against the feeding roller 4. Then, the posture of separating from the feeding roller 4 is switched. The feeding roller 4 has a substantially D shape when viewed from the side, and feeds the uppermost sheet P pressed by the arc portion to the downstream side. The feed roller 4 is provided on the feed roller shaft 5, and this feed roller shaft 5 is driven by the power transmission switching device 30 as power transmission switching means described later from the downstream drive driving roller 11. Is selectively driven, that is, it is driven to rotate only when paper is fed.

  The retard roller 6 is provided so as to be able to come into pressure contact with the arc portion of the feeding roller 4 and is provided with a predetermined rotational resistance (torque), and forms a pressure contact with the feeding roller 4. By doing so, the uppermost sheet P to be fed and the subsequent sheet P are separated.

  Next, on the downstream side of the feeding device 2, a conveyance driving roller (conveyance roller) 11 that is driven forward / reversely by a PF motor 20 and a downstream end portion of the paper guide top 10 are rotatably supported. A conveying means is provided that includes a conveyance driven roller 12 that is in pressure contact with the conveyance driving roller 11 and is driven to rotate.

The paper P that has reached the transport means is sub-scanned downstream (below the recording head 15) by the forward rotation of the transport drive roller 11 while being nipped by the transport drive roller 11 and the transport driven roller 12. Sent.
On the downstream side of the transport drive roller 11, a recording head 15 that discharges ink to the paper P and a paper guide front 16 that defines the gap between the paper P and the recording head 15 by supporting the paper P. Are arranged opposite to each other. The recording head 15 is provided at the bottom of the carriage 13, and the carriage 13 is reciprocated in the main scanning direction by the CR motor 21 while being guided by a carriage guide shaft 14 extending in the main scanning direction (the front and back direction in FIG. 1). Driven by. The carriage 13 is equipped with independent ink cartridges (not shown) for each of a plurality of colors, and supplies ink to the recording head 15.

  On the downstream side of the recording head 15, a discharge drive roller 17 to which the rotational torque of the transport drive roller 11 is transmitted via a toothed wheel train (not shown), and a discharge driven roller 18 that is driven to rotate in contact with the discharge drive roller 17. , A discharge means configured to include the above is provided. The paper P on which recording has been performed by the recording head 15 is driven forward by the discharge driving roller 17 while being nipped by the discharge driving roller 17 and the discharge driven roller 18 to the front of the apparatus (not shown). Discharged.

In FIG. 1, reference numeral 22 denotes a drive control unit that controls the PF motor 20, CR motor 21, and solenoid 37 (described later).
The above is the general configuration of the printer 1, and the power transmission switching device 30 according to the present invention will be described in detail below with reference to FIGS.

  The power transmission switching device 30 acquires the power of the PF motor 20 via the transport drive roller 35 and transmits this power to the feed roller shaft 5 only when the paper is fed. The tooth wheel train shown in FIG. Is for transmitting power from the conveyance drive roller 11 to the power transmission switching device 30.

  The transport driving roller 11 is a metal shaft body that is long in the paper width direction (main scanning direction: front and back direction in FIG. 2). Reference numeral 23 denotes an 80 digit side shaft end of the transport driving roller 11 (back side direction shaft end in FIG. 2). The gear 23 is rotationally driven by the PF motor 20.

  Reference numeral 24 denotes a gear attached to the first digit side shaft end (the shaft end in the paper surface side direction in FIG. 2) of the transport driving roller 11. From this gear 24, the gear 25, the gear 26, the gear 27a, the gear 27b, the gear Power is transmitted in the order of 28a and gear 28b, and power is transmitted to the first rotating body 31 (outer peripheral gear portion 31a) provided in the power transmission switching device 30. In FIG. 2, the gear 27 a and the gear 27 b are compound gears that are integrally formed. Similarly, the gear 28 a and the gear 28 b are also compound gears that are integrally formed.

  As shown in FIG. 3, the power transmission switching device 30 is roughly configured by a first rotating body 31, a second rotating body 32, a clutch member 33, a coil spring 34, and a solenoid device 35. The first rotating body 31 is a rotating body that rotates forward / reversely with the forward / reverse rotation of the transport driving roller 11 as described above. That is, the first rotating body 31 is a rotating body that always rotates when the transport driving roller 11 rotates. The gear part 31a and the clutch gear part 31b (FIG. 3) are integrally provided.

  The first rotating body 31 is a compound gear in which an outer peripheral gear portion 31a and a clutch gear portion 31b are integrally formed. In FIG. 3, only the clutch gear portion 31b is drawn with a solid line, and the outer peripheral gear portion 31a is a virtual line. Is shown.

  The second rotating body 32 as a member to which power is selectively transmitted by switching on / off of power transmission is fixed to the shaft end of the feeding roller shaft 5 and is disposed opposite to the first rotating body 31. At the same time, the first rotating body 31 is provided so as to be rotatable. The second rotating body 32 is provided with an annular clutch member 33 and a coil spring 34 that surround the clutch gear portion 31b.

  A tooth portion 33a that protrudes toward the clutch gear portion 31b is formed on the inner periphery of the clutch member 33, and a clutch engagement portion 33b that is a "constrained portion" that protrudes in the radial direction is formed on the outer periphery. The second rotating body 32 is supported by the second rotating body 32 so as to be swingable via a swinging shaft 32 a provided on the second rotating body 32. The clutch member 33 swings about the swing shaft 32a, whereby the tooth portion 33a is engaged with the clutch gear portion 31b (FIG. 3B), and the tooth portion 33a is the clutch gear portion. The power transmission OFF state (FIG. 3A) that is separated from 31b is switched.

  The clutch gear portion 31b is a ratchet gear, and is engaged with the tooth portion 33a of the clutch member 33 only when rotating in the clockwise direction of FIG. Further, the tooth portion 33a of the clutch member 33 is also formed in a direction along the teeth of the clutch gear portion 31b.

  The coil spring 34 as an urging means has one end locked to a spring locking portion 32b provided on the second rotating body 32 and the other end locked to a spring locking portion 33c provided on the clutch member 33. The clutch member 33 is biased by the spring force so that the power transmission is turned on (in the direction in which the tooth portion 33a meshes with the clutch gear portion 31b).

  As described above, when the clutch member 33 is in the power transmission ON state, the clutch gear portion 31b (first rotating body 31), the clutch member 33, the coil spring 34, and the second rotating body 32 can rotate together. Then, the power transmission from the first rotating body 31 to the second rotating body 32 is turned on, and the feeding roller shaft 5 (feeding roller 4) is rotationally driven.

  On the other hand, at a position facing the outer periphery of the clutch member 33, a plunger 39 as a trigger member, which constitutes a solenoid device 35, which will be described in detail later, can be engaged and disengaged with the clutch engaging portion 33b by moving forward and backward. Is arranged.

  When the plunger 39 engages with the clutch engaging portion 33b, the clutch member 33 resists the urging force of the coil spring 34 as shown in FIG. The meshing release posture (power transmission off state) is maintained.

  Next, when the plunger 39 moves backward from the power transmission OFF state shown in FIG. 3A and disengages from the clutch engaging portion 33b, the clutch member 33 is moved to the coil spring 34 as shown in FIG. With the urging force, the tooth portion 33a and the clutch gear portion 31b are swung in the meshing direction, and the meshing state (power transmission ON state) between the tooth portion 33a and the clutch gear portion 31b is maintained.

  Therefore, the power transmission ON state of FIG. 3B is maintained until the plunger 39 moves forward again and becomes engageable with the clutch engaging portion 33b, and the transport driving roller 11 and the feeding roller 4 are synchronized. Then rotate. And if the plunger 39 advances again, the clutch member 33 will return to the attitude | position of FIG. 3 (A), and will switch to a power transmission OFF state.

  Next, the solenoid device 35 including the plunger 39 will be described in detail with reference to FIGS. 4 and 5. Reference numeral 2a denotes a frame formed of a resin material that constitutes the base of the feeding device 2, and the above-described tooth wheel train and the power transmission switching device 30 are provided in the frame 2a.

  The solenoid device 35 provided in the frame 2a includes a support member 36 and a solenoid 37. The solenoid 37 further includes a base 37a, a case member 37b, an electromagnetic coil 38, a plunger 39, and a stopper. A ring 40 and a coil spring 41 are provided.

  A support 2b is integrally provided on the frame 2a by resin molding, and a support member 36 made of a resin material is attached to the support 2b. A hole 2c is formed in the support portion 2b, and the tip of the plunger 39 constituting the solenoid 37 is provided so as to protrude from the hole 2c to the power transmission switching device 30 side.

  The solenoid 37 supported by the support member 36 accommodates an electromagnetic coil 38 in a case member 37b, and a rod-shaped plunger 39 is provided so as to be able to advance and retreat relative to the case member 37b. A stopper ring 40 is attached to the plunger 39. A coil spring 41 is disposed between the stopper ring 40 and a base 37a constituting the base body of the solenoid 37, and the stopper ring 40 (ie, the plunger 39) is advanced. Energizing towards the position.

  The solenoid 37 is under the control of the drive control unit 22 (FIG. 1), and the plunger 39 moves forward and backward by switching between energization and deenergization of the electromagnetic coil 38. For example, when the energization of the electromagnetic coil 38 is stopped, the plunger 39 has advanced to the forward position by the spring force of the coil spring 41 (FIG. 4). The plunger 39 is pulled by the force and retracts to the retracted position (FIG. 5).

  As described above, when the plunger 39 advances to the forward movement position in FIG. 4, the plunger 39 and the clutch engaging portion 33 b are engaged, and the power transmission switching device 30 enters the power transmission off state. Further, when the plunger 39 is retracted to the retracted position in FIG. 5, the engagement between the plunger 39 and the clutch engaging portion 33b is released, and the power transmission switching device 30 enters the power transmission on state. In this way, the solenoid device 35 constitutes trigger means for forming a trigger for switching on / off the power transmission of the power transmission switching device 30.

  In this way, the solenoid device 35 that forms the trigger for switching on / off of power transmission is configured independently of the drive system (drive system shown in FIG. 2) by the PF motor 20, and is separate from the drive system by the PF motor 20. Independently, the power transmission of the power transmission switching device 30 can be switched on and off freely at a desired timing. For this reason, the power transmission switching of the power transmission switching device 30 can be switched on and off without interposing the reverse rotation operation of the PF motor 20, and the throughput is not reduced during the on / off switching.

  Subsequently, in the solenoid device 35, a retreat position restricting portion 36a is integrally formed with the support member 36 by resin molding on the support member 36 that supports the solenoid 37. When the plunger 39 moves from the forward position to the backward position, the stopper ring 40 as the “restricted portion” provided in the plunger 39 moves backward before the rear end of the plunger 39 and the electromagnetic coil 38 come into contact with each other. The retracted position of the plunger 39 is regulated in contact with the position regulating part 36a.

  Therefore, when the plunger 39 moves from the forward movement position toward the backward movement position, undesirable metal noise due to the contact between the plunger 39 and the electromagnetic coil 38 is prevented. Since such a silencing structure is integrally provided with a resin material on the support member 36 that supports the solenoid 37, the silencing structure does not have to be provided separately, and the silencing structure can be reduced by reducing the number of assembly steps. The structure can be arranged at low cost.

  Further, the advance position of the plunger 39 is regulated by the contact between the stopper ring 40 and the support part 2b as the advance position regulating part. Thus, since the stopper ring 40 constitutes both a means for restricting the forward movement position of the plunger 39 and a means for restricting the backward movement position, the cost of the apparatus can be increased by sharing the constituent members. In addition, since the support portion 2b is integrally formed of the frame 2 and the resin material, undesirable collision noise can be reduced or prevented even when the plunger 39 moves forward.

  In either one or both of the stopper ring 40 and the rear end position restricting portion 36a, the contact surface that contacts the other side is formed in an uneven shape (for example, a plurality of protrusions are formed), so that the contact surface The area can be reduced, and thereby the sound generated at the time of contact can be further reduced. This is the same between the stopper ring 40 and the support portion 2b as the advance position restricting portion.

1 is a side sectional view of a printer according to the present invention. The front view of the drive system which transmits motive power from a conveyance drive roller to a power transmission switching device. (A), (B) is a top view (operation explanatory drawing) of a power transmission switching device. The perspective view (operation explanatory drawing) of a solenoid device. The perspective view (operation explanatory drawing) of a solenoid device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inkjet printer, 2 feeder, 2a frame, 2b support part, 2c hole, 3 hopper, 4 feed roller, 5 feed roller axis, 6 retard roller, 10 on paper guide, 11 transport drive roller, 12 transport driven Roller, 13 Carriage, 14 Carriage guide shaft, 15 Recording head, 16 Before paper guidance, 17 Ejection drive roller, 18 Ejection driven roller, 20 PF motor, 21 CR motor, 22 Drive control unit, 23-26, 27a, 27b, 28a, 28b gear, 30 power transmission switching device, 31 first rotating body, 31a outer peripheral gear portion, 31b clutch gear portion, 32 second rotating body, 32a swing shaft, 32b spring locking portion, 33 clutch member, 33a tooth Part, 33b clutch engaging part, 33c spring locking part, 34 coil spring, 35 solenoid device, 36 support member, 37 so Renoid,
38 Electromagnetic coil, 39 Plunger, 40 Stopper ring, 41 Coil spring, P Recording paper

Claims (3)

Recording means for recording on a recording medium;
A transport roller for transporting the recording medium;
A drive motor constituting a drive source of the transport roller;
A feeding roller that feeds a recording medium to the conveyance roller by receiving power of the drive motor via the conveyance roller;
Power transmission switching means for performing on / off switching of power transmission from the conveying roller to the feeding roller,
In the power transmission switching means, trigger means for forming a trigger for switching on / off the power transmission is configured independently of a drive system driven by the drive motor,
A recording apparatus. The recording apparatus according to claim 1, wherein the power transmission switching unit includes a clutch gear that constantly rotates with the rotation of the transport roller;
A toothed portion that can mesh with the clutch gear, and swinging to turn the toothed portion in mesh with the clutch gear; and a power transmitting off state in which the toothed portion is separated from the clutch gear. A clutch member for switching between,
The feed roller is provided rotatably and supports the clutch member in a swingable manner, and when the clutch member is in the power transmission on state, power is transmitted from the clutch gear via the clutch member. A transmitted member for transmitting rotational torque to the
An urging means provided on the transmitted member together with the clutch member, for urging the clutch member in a direction in which the tooth portion meshes with the clutch gear;
The trigger means is configured to be engaged and disengaged with a restricted portion provided in the clutch member, and to hold the clutch member in the power transmission off state by engaging with the restricted portion. A trigger member,
When the trigger member engages with the restrained portion, the clutch member switches from the power transmission on state to the power transmission off state, and when the trigger member disengages from the restrained portion, The clutch member switches from the power transmission off state to the power transmission on state;
A recording apparatus. The recording apparatus according to claim 2, wherein the trigger means includes a plunger that constitutes the trigger member that moves forward and backward with switching between energization and deenergization of the electromagnetic coil, and
A support member formed of a resin material that supports the solenoid;
When the plunger moves from the forward movement position toward the backward movement position, a retraction position restricting portion that contacts a restricted portion provided on the plunger to restrict the retraction position of the plunger is integrated with the support member by a resin material. Provided,
A recording apparatus.

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