JPH08268579A - Paper feeding unit - Google Patents

Abstract

PURPOSE: To prevent a medium from coming outside of a cassette when the paper feeding cassette is pulled out. CONSTITUTION: A hole part 16 having a fan-shaped groove part 16a is arranged in a gear 14 to receive driving force of a motor 10, and a shaft 8 being a rotary shaft of a delivery roller 7 is inserted into this hole part 16. A pin 15 to enter the groove part 16a is installed on the shaft 8, and the shaft 8 is made freely rotatable to the gear 14 in a pin 15 rotatable range, and rotational directional play is applied to the delivery roller 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding unit such as a sheet feeding mechanism or a sheet feeding cassette mounted in a medium processing apparatus.

[0002]

2. Description of the Related Art In a conventional medium processing apparatus, a sheet feeding cassette for storing the medium is mounted so that it can be inserted into and pulled out of the apparatus. Inside the apparatus, the medium stored in the sheet feeding cassette is inserted. A medium feeding mechanism for feeding out is provided. This medium feeding mechanism is composed of a roller that comes into contact with the uppermost surface of the medium in the cassette when the sheet feeding cassette is inserted into the apparatus, and a driving unit such as a motor that drives this roller.

The paper feed cassette is provided with a vertically movable stage on which a medium is mounted. When the paper feed cassette is inserted into the apparatus, the stage is raised to bring the medium into contact with the roller, and the medium is moved. In addition to making it possible to extend
A mechanism is provided for preventing the medium from remaining in the apparatus by lowering the stage to prevent the medium and the roller from coming into contact with each other when the sheet cassette is pulled out.

[0004]

However, even if the stage is moved up and down in accordance with the insertion and the withdrawal of the paper feed cassette, the medium is warped, the paper feed cassette is inserted, and the like.
When the drawing is repeated, the medium may come out of the paper feeding cassette, and the medium may remain in the apparatus.

[0005]

In order to solve the above-mentioned problems, the present invention has a medium storage unit for storing a plurality of mediums in an overlapping manner, and a medium supply unit that can be inserted into and withdrawn from a medium processing apparatus. A paper cassette including a paper cassette, a feeding roller that comes into contact with the uppermost surface of the medium stored in the medium storage unit with the paper feeding cassette inserted in the medium processing device, and a motor that rotates the feeding roller. The paper unit is provided with means for providing play in the rotation direction of the feeding roller so that the feeding roller can freely rotate at a predetermined angle.

[0006]

According to the present invention having the above-described structure, when the paper feed cassette is inserted into the medium processing device, if the uppermost surface of the medium stored in the medium storing portion comes into contact with the feeding roller, the feeding roller is provided with play. It can be rotated by a certain angle. When the paper cassette is pulled out in this state, the feeding roller is rotated by the play angle when the paper cassette is inserted so that it can rotate in the direction opposite to the insertion direction. It is suspended and rotated to prevent the medium from remaining in the device.

[0007]

1 is a perspective view of a paper feeding unit showing a first embodiment of the present invention. In the figure, reference numeral 1 denotes a paper feed cassette, and the paper feed cassette 1 is mounted in a medium processing device (not shown) so that it can be inserted and pulled out. Reference numeral 2 denotes a medium storage unit, and the medium storage unit 2 is provided side by side in front of and behind the feeding direction of the medium 3 to be stored.
Two types of media can be stored. Reference numeral 4 denotes a stage on which the medium 3 is mounted, and the stage 4 is provided in each of the two medium storage units 2 so as to be vertically movable.

Reference numeral 5 denotes a separation base, 6 denotes a separation piece provided on the separation base 5, and the separation base 5 is attached to the front end of the medium accommodating portion 2 in the medium feeding direction so as to be vertically movable. Here, the stage 4 and the separation base 5
Is equipped with a mechanism that moves up and down independently of each other when the paper feed cassette 1 is inserted into or pulled out from the medium processing device. A feeding roller 7 is provided on the medium processing device side, and when the paper feed cassette 1 is mounted in the medium processing device, the feeding roller 7 moves the medium 3 stored in the medium storage unit 2. It is arranged so as to face the front end portion in the feeding direction and the separation base 5.

Reference numeral 8 is a shaft for transmitting a driving force to the feeding roller 7, and a one-way bearing 9 is mounted between the shaft 8 and the feeding roller 7. The one-way bearing 9 has a mechanism that transmits power to the payout roller 7 when the shaft 8 rotates in the direction of arrow A and does not transmit power to the payout roller 7 when the shaft 8 rotates in the direction of arrow B. Thus, when the force for rotating the payout roller 7 in the direction of arrow C is applied from the outside, the power is transmitted to the shaft 8, and when the force for rotating the payout roller 7 in the direction of the arrow D is applied from the outside, the power is applied to the shaft 8. It is a mechanism that does not convey.

Reference numeral 10 is a motor for driving the feeding roller 7, 11 is a gear attached to the rotating shaft of the motor 10, 12 is a reduction gear meshing with the gear 11, and 13 is rotation of the motor 10 meshing with the reduction gear 12. Is a gear for rotating the shaft 8. The gear 14 connected to the feeding roller 7 positioned forward in the medium feeding direction meshes with the idle gear 13 and the feeding positioned rearward in the medium feeding direction. A gear 14 connected to the roller 7 is engaged with the reduction gear 12.

FIG. 2 is a side view showing a connection structure between the gear 14 and the shaft 8, and 15 is a pin fixed to the shaft 8 so as to penetrate the shaft 8. Reference numeral 16 is a hole provided in the gear 14, and the shaft 8 is passed through the hole 16. Around the hole 16, there are two fan-shaped grooves 16a.
The pin 15 is provided at each of the grooves 16a.
The shaft 8 is attached to the gear 14 with play so that the pin 15 can freely rotate within the range in which the pin 15 can rotate in the groove 16a. There is. The shape of the fan-shaped groove 16a is determined so that the play angle of the shaft 8 with respect to the gear 14 is 90 degrees in this embodiment.

Here, in order to reduce the frictional resistance between the shaft 8 and the gear 14, it is preferable that the gear 14 is formed of plastic soaked with oil. The bearing portion (not shown) of the shaft 8 has low resistance so as not to hinder the rotation of the shaft 8 with respect to the gear 14.

FIG. 3 is an explanatory view showing the operation of the first embodiment, and the operation of the first embodiment will be described below. When the paper feed cassette 1 is attached to the medium processing device, the stage 4
Is urged upward by urging means (not shown), so that the medium 3 on the stage 4 is pressed against the feeding roller 7. When the sheet cassette 1 is pulled out of the apparatus from this state, the stage 4 is pushed down by the mechanism (not shown), for example, cam followers (not shown) provided at both ends of the stage 4 and cams (not shown) provided on the apparatus side. The pressing of the medium 3 against the feeding roller 7 is released.

When a force for rotating the feeding roller 7 in the direction of arrow C is applied from the outside, the feeding roller 7 and the shaft 8 are locked by the action of the one-way bearing 9, so that the feeding roller 7 rotates. Can not do it. As a result, a large frictional force is generated between the uppermost surface of the medium 3 and the feeding roller 7 at the initial stage of pulling out the sheet feeding cassette 1 in which the stage 4 does not descend sufficiently, and thus is shown in FIG. As described above, a deviation occurs between the second and subsequent media 3 and the first media 3 that are pulled out together with the paper feed cassette 1.

When the paper feed cassette 1 is inserted into the apparatus from this state, the stage 4 moves up and the uppermost surface of the medium 3 comes into contact with the feeding roller 7. Sheet cassette 1 as it is
When is inserted, first, the shaft 8 idles with respect to the gear 14, so that the payout roller 7 rotates in the direction of arrow D. In this embodiment, as described with reference to FIG.
On the other hand, since the shaft 8 is attached with a play angle of 90 degrees, the pay-out roller 7 rotates in the direction of arrow D due to the idling of the shaft 8 with respect to the gear 14 until the shaft 8 rotates by 90 degrees. Here, when a force for rotating the feeding roller 7 in the direction of the arrow D is applied from the outside, the feeding roller 7 and the shaft 8 become free by the action of the one-way bearing 9, and the feeding roller 7 can rotate. Since it is possible, the first medium 3
If the deviation is large and cannot be absorbed only by the idle rotation of the shaft 8, the payout roller 7 idles with respect to the shaft 8 and the payout roller 7 further rotates in the direction of arrow D.

As described above, in this embodiment, the one-way bearing 9 acts so that the pay-out roller 7 moves to the shaft 8.
On the other hand, the frictional force between the shaft 8 and the gear 14 is made smaller than the frictional force when the one-way bearing 9 idles so that the shaft 8 can idle with respect to the gear 14 before idling. As described above, when the paper feed cassette 1 is inserted into the apparatus with the first medium misaligned,
As shown in FIG. 3B, the feeding roller 7 idles, so that the paper feed cassette 1 is mounted with the deviation of the first medium being maintained. At this time, as the shaft 8 idles with respect to the gear 14, as shown in FIG. 3B, the shaft 8 has a play in which it can rotate in the arrow C direction.

As a result, when the paper feed cassette 1 is pulled out again, the feeding roller 7 can rotate in the direction of arrow C by the amount of play by the groove 16a, so that the first medium 3 and the second and subsequent mediums 3 can be rotated. The amount of deviation does not increase any further. As described above, according to the present embodiment, since the shaft 8 is attached to the gear 14 with a play in the rotational direction, the medium 3 is intended even if the sheet cassette 1 is repeatedly inserted and removed. Since it is not fed out from the paper feed cassette 1 without doing so, it is possible to suppress the medium damage, the breakage, and the remaining in the device due to the insertion and removal of the paper feed cassette 1.
As a result, even when the medium 3 is ticketed, the medium is not conveyed in a tilted manner, and it is possible to provide a device that does not cause a jam when the medium is conveyed, a magnetic encoding write inclination, and a print inclination.

FIG. 4 is an explanatory view of a sheet feeding unit showing a second embodiment of the present invention, FIG. 4 (a) is a side view and FIG. 4 (b) is a front view. In the second embodiment, a film 20 is added to the paper feed cassette 1 of the first embodiment,
The other mechanism is the same as that of the first embodiment, and the feeding roller 7 can be idled by attaching the shaft 8 to the gear 14 with a play in the rotational direction. Two films 20 are provided at the front end of the paper feed cassette 1 in the insertion direction, and come into contact with the feeding roller 7 when the paper feed cassette 1 is inserted and pulled out. Here, the film 20 is made of a material that is flexible and is not easily plastically deformed, such as a polyester film or a stainless thin plate.

FIG. 5 is an explanatory view showing the operation of the second embodiment, and the operation of the second embodiment will be described below. When the sheet cassette 1 is inserted into the medium processing device, the film 20 comes into contact with the feeding roller 7 as shown in FIG. When the sheet cassette 1 is further inserted from this state, the film 20 bends as shown in FIGS. 5B and 5C. Then, by further inserting the paper feed cassette 1, the bent film 20 is released,
By this force, the shaft 8 idles with respect to the gear 14, and the payout roller 7 rotates in the direction of arrow D. As a result, as shown in FIG. 3B, the shaft 8 is in a state in which there is a play in which the shaft 8 can rotate in the arrow C direction.

When the paper feed cassette 1 is pulled out again, the feeding roller 7 has an arrow C corresponding to the amount of play due to the groove 16a.
Since the first medium 3 and the second and subsequent mediums 3 can be rotated in any direction, no deviation occurs. As described above, according to the present embodiment, the shaft 8 is attached to the gear 14 with play in the rotational direction, and the film 20 for rotating the feeding roller 7 when the sheet cassette 1 is inserted is provided. Therefore, even if the paper feed cassette 1 is repeatedly inserted and removed, the medium 3 is prevented from being unintentionally drawn out from the paper feed cassette 1. Therefore, the medium is prevented from being damaged or broken due to the insertion and removal of the paper feed cassette 1, and remaining in the apparatus. It is possible,
As a result, even when the medium 3 is ticketed, the medium is not conveyed in a tilted manner, and it is possible to provide a device that does not cause a jam when the medium is conveyed, a magnetic encoding write inclination, and a print inclination.

Further, since the feeding roller 7 is rotated by the film 20, when the operation of pulling out the sheet cassette 1 and reinserting it is performed (when reconfirming the medium contained in the cassette). In addition, the delivery roller 7 can be surely rotated in the idle state, and the residual of the medium when the sheet feeding cassette 1 is pulled out again can be suppressed. Further, since the film 20 is made of a flexible material, the feeding roller 7 can be rotated without damaging the feeding roller 7, and there is no resistance when the sheet feeding cassette 1 is inserted or pulled out.

6A and 6B are explanatory views of a sheet feeding unit showing a third embodiment of the present invention. FIG. 6A is a side view and FIG. 6B is a front view. In the third embodiment, a rib 21 is added to the paper feed cassette 1 of the first embodiment or the paper feed cassette 1 of the second embodiment, and the other mechanism is the first.
This is the same as the embodiment described above, and the pay-out roller 7 can rotate idly by attaching the shaft 8 to the gear 14 with play in the rotational direction. The rib 21 is
The sheet feeding cassette 1 of the present embodiment is provided so as to be located in front of the medium storage portion 2 of the sheet feeding cassette 1 in the medium feeding direction and at the both ends and the center of the minimum width medium stored in the sheet feeding cassette 1. As described above, when there are two medium storage portions 2, the rib 21 is provided corresponding to each medium storage portion 2.

When the medium 3 is fed from the paper feed cassette 1, the medium 3 which is the next uppermost surface is fed to the position shown on the left side (front side in the insertion direction of the paper feed cassette 1) in FIG. 6A. Has been stopped. When the sheet cassette 1 is pulled out from the apparatus in this state, the uppermost surface of the medium 3 and the feeding roller 7 are in contact with each other until the stage 4 descends, and the feeding roller 7 moves in the direction of arrow C. Since it cannot rotate, if there is curl in the medium 3, the medium 3
Tries to remain on the device side. At this time, by providing the ribs 21, the medium 3 does not go over the ribs 21 and go out of the paper feed cassette 1, and the medium is prevented from being damaged or broken due to the insertion and removal of the paper feed cassette 1 and remaining in the apparatus. It is possible,
As a result, even when the medium 3 is ticketed, the medium is not conveyed in a tilted manner, and it is possible to provide a device that does not cause a jam when the medium is conveyed, a magnetic encoding write inclination, and a print inclination.

FIG. 7 is a block diagram of a paper feeding unit showing a fourth embodiment of the present invention. Note that the structure of the entire sheet feeding unit may be any of the above-described first embodiment, second embodiment, and third embodiment. 10 is a motor for driving the feeding roller 7 described in FIG. 1, 22 is a motor 10
Encoder unit for detecting the stop position of the motor, 23 is the motor 10
Is a control unit for controlling. FIG. 8 is a flow chart showing the operation of the fourth embodiment, and the operation of the fourth embodiment will be described below. When feeding the medium from the medium storage portion 2 located in the front in the insertion direction of the paper feed cassette 1, the control portion 23 rotates the motor 10 in the arrow E direction (S1). As a result, the shaft 8 corresponding to the medium storage portion 2 located forward of the sheet cassette 1 in the insertion direction rotates in the direction of arrow A, whereby the feeding roller 7 rotates in the direction of arrow D, and the medium 3
Is delivered. At this time, since the shaft 8 rotates in the direction of arrow B, the feeding roller 7 corresponding to the medium storage portion 2 located rearward of the sheet cassette 1 in the insertion direction does not transmit the driving force and does not rotate.

When the control section 23 detects from the output of the encoder section 22 that the medium 3 has been fed to a predetermined position (S2), it stops the driving of the motor 10 in the direction of arrow E. (S3) Next, the control unit 23 rotates the motor 10 in the direction of arrow F opposite to the above (S4). The amount of rotation at this time is such that the shaft 8 rotates 75 degrees. Motor 10 arrow F
When it is rotated in the direction, the gear 14 that transmits the driving force to the feeding roller 7 corresponding to the medium storage portion 2 located in the front in the insertion direction of the paper feed cassette 1 rotates in the arrow B direction. At this time, since a play in the rotational direction is provided between the gear 14 and the shaft 8, only the gear 14 rotates in the arrow B direction. Here, the reason why the reverse rotation amount of the motor 10 is set to 75 degrees is that the play angle between the gear 14 and the shaft 8 is 90 degrees, so that the motor 10 is stopped without exceeding the play angle, such as 60 degrees. , 90 degrees or less may be used.

Further, when the motor 10 is rotated in the direction of arrow F, the gear 14 for transmitting the driving force to the feeding roller 7 corresponding to the medium storage portion 2 located at the rear of the insertion direction of the paper feed cassette 1 is moved in the direction of arrow A. Rotate. At this time, the gear 14
Since a play in the rotation direction is provided between the shaft and the shaft 8, only the gear 14 does not rotate in the direction of the arrow A and the medium is not fed. When the control unit 23 rotates the motor 10 in the direction of the arrow F by a predetermined amount (S5), the motor 1
The rotation of 0 is stopped (S6). When there is a medium that is continuously fed (S7), the control unit 23 controls the above S1 to S.
The operations up to 6 are repeated. In this way, by rotating the motor 10 in the reverse direction after the medium feeding operation, the gear 14
By idling with respect to the shaft 8, as shown in FIG. 3B, the shaft 8 is in a state in which there is play that allows the shaft 8 to rotate in the arrow C direction.

As a result, when the paper feeding cassette 1 is pulled out, even when the paper feeding cassette 1 is pulled out for the first time after the medium feeding operation, the feeding roller 7 can be rotated in the direction of arrow C by the amount of play by the groove portion 16a. There is no deviation between the first medium 3 and the second and subsequent media 3, and the medium 3 will not unintentionally be drawn out of the paper cassette 1 even if the paper cassette 1 is repeatedly inserted and removed. It is possible to prevent the medium from being damaged or broken due to the insertion / removal of the paper feed cassette 1 and remaining in the apparatus.
It is possible to provide a device in which there is no tilt conveyance of the medium even when the ticket is issued, and there is no jam at the time of conveyance of the medium, inclination of writing of magnetic encode, and printing inclination. In the fourth embodiment, a case has been described in which the medium is fed from the medium storage portion 2 located forward of the insertion direction of the paper feed cassette 1, but
Medium storage unit 2 located behind the paper cassette 1 in the insertion direction
It can also be applied when feeding the medium from the.

Here, with respect to the medium accommodating portion 2 located in the front in the insertion direction of the paper feeding cassette 1 and the medium accommodating portion 2 in the rear in the insertion direction, the medium accommodating portion 2 located in the front in the insertion direction is the cassette drawer. Since there is a high possibility that the medium will remain at times, the control unit 23 may apply the above control only to the case where the medium is fed from the medium storage unit 2 located in the front in the insertion direction of the paper feed cassette 1. Easy to control. Further, in the fourth embodiment, the motor 10 is rotated in reverse every time one medium 3 is fed, but when a plurality of media 3 is fed, the last medium 3 is fed.
The motor 10 may be rotated in the reverse direction only after the feed is performed. In the above-mentioned first, second, third and fourth embodiments, one sheet cassette 1 is provided with two sets of medium accommodating portions 2 and two sets of feeding rollers 7 are provided correspondingly. The paper feeding unit has been described, but one paper feeding cassette 1 is provided with one set of medium storage units 2,
Correspondingly, the present invention can also be applied to a sheet feeding unit provided with one set of feeding rollers 7.

[0029]

As described above, according to the present invention, since the payout roller is provided with a play so that it can be freely rotated in the rotation direction by a predetermined angle, when the paper feed cassette is pulled out, the payout roller is loaded. Therefore, the medium is not pulled out of the paper feed cassette, and the paper feed cassette is mounted while the medium remains in the medium processing apparatus or the medium is out of the paper feed cassette. Thus, it is possible to prevent the medium from being damaged or causing a jam.

[Brief description of drawings]

FIG. 1 is a perspective view of a sheet feeding unit that represents a first exemplary embodiment of the present invention.

FIG. 2 is a side view showing a connection structure between a gear and a shaft.

FIG. 3 is an explanatory diagram showing an operation of the first embodiment.

FIG. 4 is an explanatory diagram of a paper feeding unit that represents a second embodiment of the present invention.

FIG. 5 is an explanatory diagram showing the operation of the second embodiment.

FIG. 6 is an explanatory diagram of a paper feeding unit that represents a third embodiment of the present invention.

FIG. 7 is a block diagram of a paper feeding unit representing a fourth embodiment of the present invention.

FIG. 8 is a flowchart showing an operation of the fourth embodiment.

[Explanation of symbols]

 1 Paper Feed Cassette 3 Medium 7 Feeding Roller 8 Shaft 10 Motor 14 Gear 15 Pin 16 Hole 16a Groove

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Hiroshi Ebata 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd.

Claims (4)

[Claims] 1. A sheet feeding cassette having a medium storing section for storing a plurality of sheets of medium in a stackable manner, the sheet feeding cassette being insertable into and removable from a medium processing apparatus, and the sheet feeding cassette inserted in the medium processing apparatus. In the state
In a paper feeding unit including a feeding roller that comes into contact with the uppermost surface of the medium stored in the medium storing unit and a motor that rotates the feeding roller, the feeding roller is configured to freely rotate at a predetermined angle. A paper feeding unit, characterized in that it is provided with a means for providing play in the direction of rotation of the rollers. 2. The sheet feeding unit according to claim 1, wherein a flexible film is attached to a front end of the sheet feeding cassette in the insertion direction so as to contact the feeding roller and rotate the feeding roller when the sheet feeding cassette is inserted. Characteristic paper feeding unit. 3. The paper feeding unit according to claim 1, further comprising a protrusion provided in front of the paper feeding direction of the paper feeding cassette to prevent the medium from coming out of the cassette. 4. The sheet feeding unit according to claim 1, further comprising a control unit that drives the motor to rotate a feeding roller to feed a medium and then reversely rotates the motor. Characteristic paper feeding unit.