JP3233471U - Paper feed mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper feed mechanism capable of correcting a paper misalignment with only one drive motor. SOLUTION: A paper feed passage 10, a drive motor 20 for controllingly outputting reverse and forward drive forces, a unidirectional drive mechanism 50 connected to the drive motor, and a unidirectional drive mechanism are connected. The unidirectional drive is provided with at least one paper stop roller 60, a bidirectional drive mechanism 30 connected to the drive motor, and at least one paper feed roller 40 connected to the bidirectional drive mechanism. When the drive motor outputs a driving force in the reverse direction, the mechanism transmits a driving force in the forward direction to the paper stop roller, and when the drive motor outputs a driving force in the forward direction, the mechanism transmits the driving force in the forward direction to the paper stop roller. The bidirectional drive mechanism does not transmit the driving force, and the bidirectional drive mechanism transmits the drive force in the forward direction to the paper feed roller regardless of whether the drive motor outputs the drive force in the reverse direction or the forward direction. .. [Selection diagram] Fig. 1

Description

The present invention relates to a paper feed mechanism, and more particularly to a paper feed mechanism capable of correcting a paper misalignment with only one drive motor.

Paper misalignment means that the leading edge of the paper is not parallel to the axial direction of the paper feed roller in the process of feeding the paper. When paper misalignment occurs, it tends to cause a paper jam and affect the image quality of image scanning or printing. Therefore, the conventional paper feed mechanism is provided with a misalignment correction roller for correcting the paper misalignment. Was there. See FIG. The conventional displacement correction roller 70 is provided in the paper feed passage and is located on the downstream side of the paper removal roller 72. Since the deviation correction roller 70 is interlocked with the individually provided control motor 71, the rotation time and direction do not depend on the paper removing roller 72.

See FIGS. 7 and 8. When the paper removing roller 72 starts feeding paper, the deviation correction roller 70 maintains a stationary state. Therefore, when the displaced paper is fed to the position of the correction roller 70 by the paper removing roller 70, it is in front of the paper. The edge is blocked by the misalignment correction roller 70 and becomes parallel to the axial direction of the roller 70. After the misalignment of the paper is corrected, the misalignment correction roller 70 returns to the rotating state and feeds the paper to the downstream side.

However, since the manufacturing cost increases when the individual control motors are added in this way, it is necessary to provide a paper feed mechanism capable of correcting the paper misalignment with only one drive motor.

An object of the present invention is to provide a paper feed mechanism capable of correcting a paper misalignment with only one drive motor.

In order to realize the above object, the paper feed mechanism of the present invention is connected to a paper feed passage, a drive motor that outputs a controllable drive force in the reverse direction and the forward direction, and a drive force by being connected to the drive motor. A bidirectional drive mechanism that transmits The drive motor includes a directional drive mechanism and at least one paper stop roller that is mounted in the paper feed passage and is provided at a position downstream of the paper feed roller and is connected to the unidirectional drive mechanism. When outputting the driving force in the reverse direction, the bidirectional driving mechanism transmits the driving force in the forward direction to the paper feed roller, and the unidirectional driving mechanism transmits the driving force in the forward direction to the paper stop roller. When the drive motor outputs a positive drive force, the bidirectional drive mechanism transmits the positive drive force to the paper feed roller, and the unidirectional drive mechanism does not transmit the drive force to the paper stop roller. ..

In a preferred embodiment, the unidirectional drive mechanism rotatably covers the drive shaft, which transmits a driving force by being connected to the drive motor, and is connected to the paper stop roller. The drive shaft has a roller shaft and a torsion spring whose fixed end is connected to the drive shaft and whose free end covers the outer peripheral side of the roller shaft, and the torsion spring has a positive winding direction. Rotates in the positive direction, the inner diameter of the torsion spring contracts due to frictional force.

In a preferred embodiment, the drive shaft is provided with a blind hole, the fixed end is provided with a hook, and the hook is inserted into the blind hole so that the torsion spring is formed together with the drive shaft. Rotate.

In a preferred embodiment, the bidirectional drive mechanism includes an input gear that transmits a driving force by being connected to the drive motor, a forward swing arm coaxially supported by the input gear, and the input gear. A reverse swing arm coaxially supported by the gear, a forward gear set that moves together by being provided on the forward swing arm and transmits a driving force by being connected to the input gear, and the above. A reverse gear set that moves together by being provided on the reverse swing arm and transmits a driving force by being connected to the input gear, and swing of the forward swing arm and the reverse swing arm. When the forward gear set has an output gear set provided at an intersecting position of the path and connected to the paper feed roller and the positive direction gear set transmits the driving force, the direction of the driving force is reversed and the driving motor moves. When the driving force in the reverse direction is output, the forward swing arm swings to the output gear set to transmit the driving force to the output gear set via the forward gear set, and the reverse gear set causes the reverse gear set. When transmitting the driving force, the direction of the driving force is maintained, and when the driving motor outputs the driving force in the forward direction, the reverse swing arm swings to the output gear set to reverse the driving force. It is transmitted to the output gear set via the directional gear set.

In a preferred embodiment, the forward swing arm and the reverse swing arm are integrally molded.

In a preferred embodiment, the output gear set meshes with the relay gear provided at the intersection of the swing paths of the forward swing arm and the reverse swing arm, and is connected to the paper feed roller. Has an output gear, which is

In a preferred embodiment, the reverse gear set has an odd number of reverse gears that mesh with each other and an odd number of compression springs that are attached between the reverse gear and the reverse swing arm.

In a preferred embodiment, the positive gear set has an even number of positive gears that mesh with each other and an even number of compression springs that are attached between the positive gear and the positive swing arm.

It is a figure which shows the cross section of the paper feed mechanism which concerns on this invention. It is an exploded view of the paper feed mechanism which concerns on this invention. It is an exploded view of the unidirectional drive mechanism which concerns on this invention. It is a figure which shows the operation when the drive motor outputs the driving force in the reverse direction of the paper feed mechanism which concerns on this invention. It is a figure which shows the operation when the drive motor outputs the driving force in the positive direction of the paper feed mechanism which concerns on this invention. It is a figure which shows the cross section of the conventional paper feed mechanism. It is a figure which shows the paper misalignment. It is a figure which shows the correction of a paper misalignment.

Hereinafter, the technical content, structure and features of the present invention, the purpose to be achieved, and the effect to be achieved will be described in detail with reference to the drawings with examples.

In practice, there are many types of drive structure arrangement types, and examples cannot be given one by one. Therefore, for convenience of explanation, in this specification, the rotation direction of the paper feed roller is used when explaining the rotation direction of the element and the driving force. Is the standard. Therefore, the forward direction is the rotation direction in which the paper feed roller feeds the paper to the downstream side of the paper feed passage, and the reverse direction is the rotation direction in which the paper feed roller feeds the paper to the upstream side of the paper feed passage. be.

See FIGS. 1 to 3. In order to realize the above object, the paper feed mechanism 100 of the present invention is connected to the paper feed passage 10, the drive motor 20 that outputs the driving force in the reverse direction and the forward direction in a controllable manner, and the drive motor 20. This means that the bidirectional drive mechanism 30 that transmits the driving force, at least one paper feed roller 40 that is installed in the paper feed passage 10 and is connected to the bidirectional drive mechanism 30, and the drive motor 20 are connected to each other. A unidirectional drive mechanism 50 that transmits the driving force, and at least one paper that is installed in the paper feed passage 10 and is provided at a position on the downstream side of the paper feed roller 40 and is connected to the unidirectional drive mechanism 50. A stop roller 60 and a stop roller 60 are provided.

In this way, when the drive motor 20 outputs a drive force in the forward direction, the bidirectional drive mechanism 30 transmits the drive force in the forward direction to the paper feed roller 40, and the unidirectional drive mechanism 50 is said. The driving force is not transmitted to the paper stop roller 60. At this time, the paper advances to the downstream side by the drive of the paper feed roller 40, and after the leading edge comes into contact with the paper stop roller 60, it is blocked by the roller 60 and becomes parallel to the axial direction of the roller 60. The deviation is corrected. On the other hand, when the drive motor 20 outputs a drive force in the opposite direction, the bidirectional drive mechanism 30 transmits a drive force in the forward direction to the paper feed roller 40, and the unidirectional drive mechanism 50 uses the paper stop roller. Since the driving force in the positive direction is transmitted to the 60, the misaligned paper is sent further to the downstream side.

In the embodiments shown in FIGS. 2 and 3, the bidirectional drive mechanism 30 is connected to the drive motor 20 via the unidirectional drive mechanism 50 in order to further simplify the overall structure. The unidirectional drive mechanism 50 is connected to each other by two symmetrically provided paper stop rollers 60, and is connected to the drive motor 20 to transmit a driving force and has two blind holes. A drive shaft 51 provided with 54, two roller shafts 52 rotatably covering the drive shaft 51 and connected to the two paper stopper rollers 60, and hooks 55 are provided at their fixed ends, respectively. The free ends of the two roller shafts 52 cover the outer peripheral side of the two roller shafts 52, and the hooks 55 are inserted into the blind holes 54 to be fixed and connected to the drive shafts 51 and to rotate together with the coaxial 51. It has a torsion spring 53 and. Since the two torsion springs 53 rotate in the positive direction, when the drive shaft 51 rotates in the positive direction, the two torsion springs 53 are further tightened by the frictional force received from the coaxial 51 and the inner diameter is reduced. Tighten each of the roller shafts 52. On the other hand, when the drive shaft 51 rotates in the opposite direction, the two torsion springs 53 are loosened by the frictional force received from the coaxial 51, and are in an idle state.

The bidirectional drive mechanism 30 is integrally formed with an input gear 31 that transmits a driving force by being connected to the drive motor 20 via the drive shaft 51 and coaxially supported by the input gear 31. A forward gear set that moves together with the forward swing arm 32 and the reverse swing arm 33 by being provided on the forward swing arm 32 and transmits a driving force by being connected to the input gear 31. 34, a reverse gear set 35 that moves together by being provided on the reverse swing arm 33 and transmits a driving force by being connected to the input gear 31, the forward swing arm 32 and the said. The intersection position of the swing path of the reverse swing arm 33 (the locus drawn by the center point of the forward gear on the outside of the forward swing arm rotating around the drive shaft, and the locus on the outside of the reverse swing arm 33. It has an output gear set 37 which is provided at an intersection with a locus drawn by rotating the center point of the reverse gear around the drive shaft) and is connected to the paper feed roller 40. In this embodiment and the drawings, the number of gears included in the forward gear set 34, the reverse gear set 35, and the output gear set 37 is the connection order, the motor installation position, and the deceleration when actually designing. It can be adjusted by factors such as ratio, and is omitted so as not to enumerate all.

See again FIGS. 2, 4 and 5. In the present embodiment, the output gear set 37 meshes with the relay gear 371 provided at the intersection of the swing paths of the forward swing arm 32 and the reverse swing arm 33 and the relay gear 371. It has an output gear 372 connected to a paper feed roller 40.

Since the reverse gear set 35 has a reverse gear 351 and a compression spring 36 attached between the reverse gear 351 and the reverse swing arm 33, the reverse gear set 35 is driven when a driving force is transmitted. The direction of force will be reversed. Since the spring urges the reverse gear 351 with a reaction force, when the drive motor 20 outputs a drive force in the reverse direction, the reverse gear 351 drives the gear 31 by driving the input gear 31. It rotates in the opposite direction to the center, and the reverse swing arm 33 swings to the relay gear 371. Then, the driving force in the reverse direction is transmitted to the relay gear 371 after being reversed by the reverse gear set 35, and is transmitted to the output gear after being reversed by the relay gear 371. In this way, the output gear 372 rotates in the positive direction.

Since the positive direction gear set 34 has two positive direction gears 341 that mesh with each other and two compression springs 36 that are attached between the positive direction gear 341 and the positive direction swing arm 32, a driving force is provided. Will maintain the direction of the driving force when transmitting. Since the spring urges the positive direction gear 341 with a reaction force, when the drive motor 20 outputs a positive direction driving force, the positive direction gear 341 drives the gear 31 by driving the input gear 31. It rotates in the positive direction about the center, and the forward swing arm 32 swings to the relay gear 371. Then, the driving force in the positive direction is directly transmitted to the relay gear 371 via the positive direction gear set 34, reversed by the relay gear 371, and then transmitted to the output gear. In this way, the output gear 372 rotates in the positive direction.

100 Paper feed mechanism 10 Paper feed passage 20 Drive motor 30 Bidirectional drive mechanism 31 Input gear 32 Forward swing arm 33 Reverse swing arm 34 Forward gear set 341 Forward gear 351 Reverse gear 36 Compression spring 37 Output gear Set 371 Relay gear 372 Output gear 40 Paper feed roller 50 Unidirectional drive mechanism 51 Drive shaft 52 Roller shaft 53 Twisting spring 54 Blind hole 55 Hook 60 Paper stop roller 70 Misalignment correction roller 71 Control motor 72 Paper removal roller

Claims (8)

Paper feed passage and
A drive motor that outputs controllable driving force in the reverse and forward directions,
A bidirectional drive mechanism that transmits driving force by being connected to the drive motor,
With at least one paper feed roller mounted in the paper feed passage and connected to the bidirectional drive mechanism.
A unidirectional drive mechanism that transmits driving force by being connected to the drive motor,
At least one paper stop roller that is installed in the paper feed passage and is provided at a position downstream of the paper feed roller and is connected to the unidirectional drive mechanism.
With
When the drive motor outputs a drive force in the opposite direction, the bidirectional drive mechanism transmits the drive force in the forward direction to the paper feed roller, and the unidirectional drive mechanism transmits the drive force in the forward direction to the paper stop roller. Communicate,
When the drive motor outputs a positive driving force, the bidirectional driving mechanism transmits the positive driving force to the paper feed roller, and the unidirectional driving mechanism does not transmit the driving force to the paper stop roller. ,
A paper feed mechanism characterized by this. The unidirectional drive mechanism
A drive shaft that transmits driving force by being connected to the drive motor,
A roller shaft that rotatably covers the drive shaft and is connected to the paper stop roller.
A torsion spring whose fixed end is connected to the drive shaft and whose free end covers the outer peripheral side of the roller shaft.
Have,
Since the torsion spring has a positive winding direction, the inner diameter of the torsion spring contracts due to frictional force when the drive shaft rotates in the positive direction.
The paper feed mechanism according to claim 1. The drive shaft is provided with a blind hole, and the fixed end is provided with a hook.
When the hook is inserted into the blind hole, the torsion spring rotates together with the drive shaft.
The paper feed mechanism according to claim 2, wherein the paper feed mechanism is characterized by this. The bidirectional drive mechanism
An input gear that transmits driving force by being connected to the drive motor,
A positive swing arm coaxially supported by the input gear,
A reverse swing arm coaxially supported by the input gear and
A positive gear set that moves together by being provided on the positive swing arm and transmits a driving force by being connected to the input gear.
A reverse gear set that moves together by being provided on the reverse swing arm and transmits a driving force by being connected to the input gear.
An output gear set provided at an intersection of the swing paths of the forward swing arm and the reverse swing arm and connected to the paper feed roller.
Have,
When the forward gear set transmits a driving force, the direction of the driving force is reversed, and when the drive motor outputs a driving force in the opposite direction, the forward swing arm swings to the output gear set. The driving force is transmitted to the output gear set via the positive direction gear set.
When the reverse gear set transmits the driving force, the direction of the driving force is maintained, and when the drive motor outputs the driving force in the forward direction, the reverse swing arm swings to the output gear set. The driving force is transmitted to the output gear set via the reverse gear set.
The paper feed mechanism according to claim 1. The forward swing arm and the reverse swing arm are integrally molded.
The paper feed mechanism according to claim 4, wherein the paper feed mechanism is characterized. The output gear set is
A relay gear provided at an intersection of the swing paths of the forward swing arm and the reverse swing arm,
An output gear that meshes with the relay gear and is connected to the paper feed roller,
Have,
The paper feed mechanism according to claim 4, wherein the paper feed mechanism is characterized. The reverse gear set is
Odd reverse gears that mesh with each other,
An odd number of compression springs mounted between the reverse gear and the reverse swing arm,
Have,
The paper feed mechanism according to claim 6, wherein the paper feed mechanism is characterized by this. The positive gear set is
Even-numbered positive gears that mesh with each other,
An even number of compression springs mounted between the positive gear and the positive swing arm,
Have,
The paper feed mechanism according to claim 6, wherein the paper feed mechanism is characterized by this.

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