JP5014037B2 - Paper feeder - Google Patents

Description

  The present invention relates to a sheet feeding device that is mounted on a sheet processing apparatus such as an image forming apparatus that forms an image on a sheet and feeds the sheet one by one.

  In a sheet processing apparatus such as an image forming apparatus, a sheet conveyance path is formed via a processing unit, and a sheet feeding apparatus that feeds sheets one by one to the sheet conveyance path is mounted. The sheet is subjected to a predetermined process in the processing unit while being conveyed through the sheet conveyance path.

  Some sheet feeding devices include a pressing plate, a sheet feeding roller, and an elastic member, and are mounted on the back surface of the sheet processing device. The pressing plate is swingably supported with the upper end side as a fulcrum in an inclined state with the upstream side in the sheet feeding direction upward, and a plurality of sheets can be stacked and accommodated on the upper surface. A lower end portion of the pressing plate is connected to an upstream end portion of the sheet conveyance path. The paper feed roller is rotatably supported on the lower end side of the pressing plate. The elastic member biases the lower end side of the pressing plate toward the paper feed roller by elastic force.

  The paper accommodated in the pressing plate is sandwiched between the upper surface of the pressing plate and the paper feeding roller at the downstream end in the feeding direction, and is fed into the paper conveyance path by the rotation of the paper feeding roller.

  When the sheet is stored in the pressing plate, the pressing plate is placed so that the upper surface of the pressing plate is separated from the feeding roller so as to provide a space for inserting the sheet between the upper surface of the pressing plate and the feeding roller. It is necessary to oscillate against the elastic force of the elastic member.

  The sheet feeding device includes a stopper that holds the pressing plate at a position where the upper surface of the pressing plate is separated from the sheet feeding roller. When the upper surface of the pressing plate is swung in a direction away from the paper feeding roller and the distance between the upper surface of the pressing plate and the paper feeding roller reaches a predetermined length, the stopper prohibits the rocking of the pressing plate. The operator does not need to manually hold the state where the upper surface of the pressing plate is separated from the paper feed roller when the sheet is accommodated in the pressing plate.

  In a state in which the pressing plate is prohibited from swinging by the stopper, the paper feed roller does not contact the upper surface of the paper stored in the press plate, and the paper is not fed out even if the paper feed roller is rotated. For this reason, after the sheet is stored in the pressing plate, it is necessary to cancel the prohibition of the swinging of the pressing plate by the stopper before the sheet processing operation is started in the sheet processing apparatus.

  Therefore, some conventional paper feeders include a pressing plate, a pressing plate operating member, a stopper, and a stopper operating member (see, for example, Patent Document 1). The pressing plate is swingably supported between an upper limit position contacting the paper feed roller and a lower limit position spaced from the paper feed roller. The pressing plate operating member is pivotally supported between the operating position and the non-operating position, and moves the pressing plate from the upper limit position to the lower limit position by the swing operation from the non-operating position to the operating position. The stopper restricts the movement of the pressing plate to the upper limit position by moving from the release position to the locking position when the pressing plate moves from the upper limit position to the lower limit position. The stopper operating member moves the stopper from the lock position to the release position as the paper feed roller rotates.

When the paper feed roller starts rotating at the start of the paper processing operation in the paper processing apparatus, the stopper operating member moves the stopper to the release position, and the movement of the pressing plate from the lower limit position to the upper limit position is not restricted. Even if the operator neglects the operation of moving the stopper from the lock position to the release position and starts the sheet processing operation, the sheet can be reliably fed out from the sheet feeding device.
JP 2001-139159 A

  However, the configuration described in Patent Document 1 has a problem that the pressing plate cannot be selectively fixed at the lower limit position by the stopper.

  That is, the stopper of Patent Document 1 swings from the release position to the lock position by its own weight when the pressing plate swings from the upper limit position toward the lower limit position by the operation of the pressing plate operating member. In order to restrict the movement of the pressing plate toward the upper limit position only by the stopper, the stopper needs to be accurately orthogonal to the upper surface of the pressing plate at the lock position. For this reason, the dimensional accuracy of the stopper and the accuracy of the mounting position must be strictly defined.However, the stopper is displaced from the appropriate position with respect to the pressing plate at the locking position due to errors and time-dependent deformation that occur during manufacturing, and the pressing plate is There is a possibility that it cannot be fixed at the lower limit position.

  It is also conceivable that the pressing plate is supplementarily held at the lower limit position by the pressing plate operating member moved to the operating position. However, the pressing plate operating member is not interlocked with the stopper, and the pressing plate remains held at the lower limit position by the pressing plate operating member even if the stopper moves from the lock position to the release position when the paper feed roller rotates. there is a possibility.

  An object of the present invention is to move a stopper that selectively regulates the swing of the pressing plate by transmitting the rotation operation of the operation member and the rotation of the sheet feeding roller, and the pressing plate is moved according to the sheet feeding situation. Another object of the present invention is to provide a paper feeding device that can be reliably positioned at a predetermined position.

The sheet feeding device of the present invention includes a pressing plate, a sheet feeding roller, a first elastic member, a stopper, an operation member, and a transmission member. The pressing plate is swingably supported with the upper end portion as a fulcrum, and a plurality of sheets can be stacked and accommodated on the upper surface. The paper feed roller is supported so as to be rotatable around an axis parallel to the swing axis of the pressing plate above the lower end portion of the pressing plate. The first elastic member biases the lower end portion of the pressing plate toward an upper limit position where the lower end portion comes into contact with the paper feed roller. The stopper displaces the pressing plate toward the lower limit position that is separated from the paper feeding roller by a predetermined distance while rotating from the release position to the locking position around an axis parallel to the rocking axis of the pressing plate above the pressing plate. Then, it stops at the locked position by engagement with the pressing plate. The operating member is rotatably disposed around an axis parallel to the swinging axis of the pressing plate above the pressing plate, and rotates the stopper from the release position to the locking position while rotating from the stop position to the operating position. The transmission member selectively transmits the rotation of the drive shaft to the paper feed roller, and releases the engagement between the stopper and the pressing plate when the paper feed roller rotates.
The transmission member includes a lever and a second elastic member. The lever is an intermediate gear that meshes with the drive gear attached to the drive shaft and the paper feed roller gear attached to the paper feed roller, and includes an intermediate gear having ribs protruding in the radial direction, and a retraction position and an operation position. There is a first end that is pivotably supported between the ribs and abuts against the rib by rotation of the intermediate gear at the retracted position, and a second end that rotates the stopper to the release position at the operating position. The second elastic member biases the lever toward the retracted position.
The lever swings from the retracted position to the operating position when the rib contacts the first end by the rotation of the intermediate gear. The lever has a shape in which the distance from the contact position with the first end in the radial direction of the intermediate gear to the axis of the intermediate gear gradually decreases along the rotation direction of the intermediate gear.

With this configuration, when the operation member is rotated from the stop position toward the operation position, the stopper rotates from the release position toward the lock position, and the pressing plate swings toward the lower limit position separated from the paper feed roller by a predetermined distance. Move. When the stopper reaches the lock position, it engages with the pressing plate at the lower limit position and stops. Therefore, when the operation member is rotated from the stop position to the operation position, the pressing plate is fixed to the lower limit position via the stopper, and a predetermined gap for inserting paper is formed between the pressing plate and the paper feed roller. The The predetermined distance at which the pressing plate is separated from the paper feed roller is set according to the thickness of the number of sheets that can be accommodated by the pressing plate.
Further, when the intermediate gear transmits the rotation of the drive shaft to the paper feed roller, the rib abuts against the first end of the lever, so that the lever swings from the retracted position to the operating position, and the lever first The end of 2 rotates the stopper to the release position, and the fixing of the pressing plate at the lower limit position by the stopper is released. Thereafter, the lever swings from the operating position to the retracted position by the elastic force of the second elastic member. At this time, the distance from the contact position between the rib and the first end in the radial direction of the intermediate gear to the axial center of the intermediate gear gradually decreases along the rotation direction of the intermediate gear, and the lever It is decelerated by friction and goes to the retracted position. For this reason, the impact at the time of contact of the member that restricts the swing of the lever at the retracted position and the lever is alleviated. Even when the pressing plate is not in the lower limit position, the lever swings from the retracted position to the retracted position and then swings from the retracted position to the retracted position each time the paper is fed by the rotation of the paper feed roller. It is possible to prevent the lever from generating an impact sound.

  The transmission member releases the engagement between the stopper and the pressing plate when transmitting the rotation of the drive shaft to the paper feed roller. When the paper feed roller is rotated to feed the paper on the pressing plate, the stopper does not fix the pressing plate at the lower limit position, and the pressing plate swings toward the upper limit position by the elastic force of the first elastic member. Then, the sheet abuts against the sheet feeding roller.

  When the operating member is rotated from the stop position to the operating position, the elastic force of the first elastic member acts as a reaction force via the stopper. By rotating the operation member against the elastic force of the first elastic member, the stopper moves from the release position to the lock position. The stopper is held by engagement with the pressing plate at the lower end position at the lock position, and reliably stops at the lock position. The stopper is automatically disengaged from the pressing plate by the transmission member when the paper feed roller rotates, and moves to the release position by the elastic force of the first elastic member.

  By providing the pressing plate with a recess that engages the stopper at the lower limit position, the stopper can be reliably stopped at the lock position.

  By rotating the operation member in synchronization with the stopper, the rotation of the operation member can be reliably transmitted to the stopper, and the stopper can be interlocked with the operation member.

  The intermediate gear is formed by coaxially forming a first chipped gear that selectively meshes with the drive gear and a second chipped gear that selectively meshes with the paper feed roller gear. Also good. In this case, a rotation restricting member and a third elastic member can be further provided. The rotation restricting member selectively restricts the rotation of the intermediate gear at a position where the first chipped gear and the second chipped gear do not mesh with the drive gear and the paper feed roller gear, respectively. The third elastic member biases the intermediate gear in the rotational direction transmitted from the drive gear to the first chipped gear.

  By operating the rotation restricting member every time the intermediate gear makes one rotation, the first chipped gear and the second chipped gear are selectively meshed with the drive gear and the feed roller gear, respectively, and the drive shaft is rotated. It can be transmitted intermittently to the paper feed roller one rotation at a time.

  Hereinafter, a paper feeding device according to the best embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an external view of a facsimile apparatus as a paper processing apparatus to which a paper feeding apparatus according to an embodiment of the present invention is applied. The facsimile apparatus 100 transmits / receives image information to / from other facsimile apparatuses via a public telephone line and transmits / receives audio signals to / from other telephones. The facsimile apparatus 100 includes an image forming section as a paper processing section that records image information received from another facsimile apparatus on paper.

  The facsimile apparatus 100 includes a sheet feeding device 1 together with an operation unit 101 and a receiver 102. The operation unit 101 is disposed on the front side of the upper surface of the facsimile machine 100 and includes a key switch 111 and a display 112. The key switch 111 accepts an input operation or the like of a communication destination or a telephone number of a call destination. The display 112 displays the operating state of the facsimile machine 100 and the like. The handset 102 is used for input / output of audio signals transmitted / received to / from other telephones.

  The paper feeding device 1 is mounted on the back surface of the facsimile machine 100 with the paper tray 11 tilted backward. The sheet feeding device 1 feeds the sheets stored in the sheet tray 11 one by one toward the sheet conveyance path in the facsimile apparatus 100. Inside the facsimile machine 100, a paper conveyance path is formed from the back side to the paper discharge port 103 opened to the upper surface via the image forming unit. The sheet fed from the sheet feeding device 1 is discharged onto the upper surface of the facsimile apparatus 100 from the sheet discharge port 103 after image information is recorded by the image forming unit.

  FIG. 2 is an external view of the sheet feeding device according to the embodiment of the present invention. 3 and 4 are side views of the sheet feeding device in a state where the operation member is in the operating position. FIG. 5 is a side view of the transmission member of the sheet feeding device on the side opposite to FIG. In FIG. 2, the paper tray 11 is omitted. In FIG. 3, the transmission member is omitted. In FIG. 4, the paper feed roller is omitted.

  The sheet feeding device 1 includes a pressing plate 2, a sheet feeding roller 3, a coil spring 4, a stopper 5, an operation member 6, a transmission member 7, and a guide plate 8.

  The pressing plate 2 is supported in a swingable manner from the upper limit position to the lower limit position with a hole 21 formed in the upper end portion of the side walls 12 and 13 as a fulcrum, and a predetermined number of sheets are stacked on the upper surface and accommodated. Has been made possible. The upper surface of the pressing plate 2 is brought into contact with the sheet feeding roller 3 at the upper limit position, and the pressing plate 2 is separated from the sheet feeding roller 3 with a predetermined gap at the lower limit position. Concave portions 22 are formed in the vicinity of the side walls 12 and 13 on the upper surface of the pressing plate 2.

  The paper feed roller 3 is supported above the lower end portion of the pressing plate 2 so as to be rotatable around an axis parallel to the swing axis of the pressing plate 2. The paper feed roller 3 feeds the sheets placed on the upper surface of the pressing plate 2 one by one along the upper surface of the guide plate 8. On the upper surface of the guide plate 8, a separating member 81 for preventing multiple feeding of sheets is attached.

  The coil spring 4 is a first elastic member of the present invention, and biases the lower end portion of the pressing plate 2 in the direction of arrow A toward the upper limit position. In addition, the coil spring 4 is arrange | positioned between the press board 2 and the backplate 14, and does not appear in FIG.

  The stopper 5 is supported above the pressing plate 2 by the side walls 12 and 13 so as to be rotatable around an axis parallel to the swing axis of the pressing plate 2 from the release position to the lock position. The stopper 5 includes a gear portion 51 exposed outside the side walls 12 and 13, and a stopper piece 52 that contacts the upper surface of the pressing plate 2 inside the side walls 12 and 13. The stopper 5 displaces the pressing plate 2 from the upper limit position to the lower limit position while rotating from the release position to the locking position, and stops at the locking position by engagement with the recess 22 of the pressing plate 2. In FIG. 2, the stopper 5 on the side wall 12 side is omitted. The stopper 5 can be provided only on one of the side walls 12 and 13.

  The operating member 6 is supported above the pressing plate 2 by the side walls 12 and 13 so as to be rotatable around an axis parallel to the swing axis of the pressing plate 2 from the stop position to the operating position. The operation member 6 includes a gear portion 61 that meshes with the gear portion 51 outside the side walls 12 and 13. The operation member 6 rotates the stopper 5 from the release position to the lock position while rotating from the stop position to the operation position. The rotation of the operation member 6 is transmitted in synchronization with the stopper 5 by the engagement of the gear portion 51 and the gear portion 61. The operating member 6 is disposed above the pressing plate 2 and across the entire width of the pressing plate 2 along the Y axis perpendicular to the paper feeding direction X, and is close to the upper surface of the pressing plate 2. Thus, the sheet placed on the pressing plate 2 is prevented from tilting to the front side.

  As shown in FIGS. 4 and 5, the transmission member 7 includes an intermediate gear 71, a lever 72, a spring 73, a spring 74, and a solenoid 75.

  The intermediate gear 71 selectively meshes with the first chipped gear 711 that selectively meshes with the drive gear 91 attached to the drive shaft 9 and the second gear that selectively meshes with the paper feed roller gear 31 attached to the paper feed roller 3. And a rib 713 projecting in the radial direction. The intermediate gear 71 rotates in the direction of arrow C by the rotational force transmitted from the drive shaft 9. Although a one-way clutch can be used instead of the intermediate gear 71, there is a high possibility that the apparatus will be increased in size due to a complicated configuration.

  The lever 72 is substantially L-shaped, and the intermediate portion is pivotally supported by the side walls 12 and 13 so as to be swingable between the retracted position and the operating position, and the rib 713 contacts the rotation of the intermediate gear 71 at the retracted position. It has a first end 721 and a second end 722 that rotates the stopper 5 to the release position in the operating position. The lever 72 swings in the arrow B ′ direction from the retracted position to the operating position when the rib 713 contacts the first end 721 by the rotation of the intermediate gear 71.

  The spring 73 is a second elastic member of the present invention, and biases the lever 72 in the direction of arrow B toward the retracted position. The spring 74 is a third elastic member of the present invention, and biases the intermediate gear 71 in the direction of arrow C toward the rotational direction transmitted from the drive gear 91 to the first chipped portion 711.

  The solenoid 75 is a rotation restricting member of the present invention, and includes an armature 751 that selectively engages with a step portion 714 of the intermediate gear 71. The solenoid 75 retracts the armature 751 to a position where it does not engage with the stepped portion 714 during driving. By controlling the driving state of the solenoid 75, the rotation of the intermediate gear 71 is selectively performed at a position where the first chipped gear 711 and the second chipped gear 712 do not mesh with the drive gear 91 and the paper feed roller gear 31, respectively. regulate. In addition, it can replace with the solenoid 75 as a rotation control member of this invention, and can also provide the mechanism which uses a motor as a drive source.

  6 and 7 are side views of the sheet feeding device in a state where the operation member is at the stop position. In FIG. 6, the paper feed roller is omitted, and in FIG. 7, the transmission member is omitted. When the operation member 6 is in the stop position, the stopper piece 52 of the stopper 5 is in the release position and does not press the pressing plate 2. For this reason, the pressing plate 2 can swing in the direction of arrow A toward the upper limit position by the elastic force of the spring 4, and abuts against the paper feed roller 3 with the paper placed on the upper surface interposed therebetween.

  When the operation member 6 is rotated in the direction of arrow D from the stop position shown in FIGS. 6 and 7 to the operation position shown in FIGS. 3 and 4, the stopper 5 is moved to the release position by the meshing of the gear portion 51 and the gear portion 61. Rotate in the direction of arrow E toward the lock position. At this time, the stopper piece 52 swings the pressing plate 2 in the arrow A ′ direction from the upper limit position toward the lower limit position against the elastic force of the spring 4. When the operation member 6 rotates to the operation position shown in FIGS. 3 and 4, the stopper 5 reaches the lock position, and the stopper piece 52 engages with the recess 22.

  When the operation member 6 is rotated from the stop position to the operation position, the elastic force of the coil spring 4 acts as a reaction force through the stopper 5 from the middle. By rotating the operation member 6 with a force larger than the elastic force of the coil spring 4, the stopper 5 can be reliably moved from the release position to the lock position in synchronization with the rotation of the operation member 6. When the stopper 5 reaches the lock position, the stopper 5 can be reliably stopped at the lock position by the engagement between the stopper piece 52 and the recess 22 of the press plate 2, and the press plate 2 can be reliably fixed at the lower limit position. .

  FIG. 8 is a side view of the sheet feeding device in a state before sheet feeding. FIG. 9 is a side view of the transmission member of the sheet feeding device on the side opposite to FIG. When paper is not being fed, the armature 751 of the solenoid 75 in the non-driven state is engaged with the step portion 714, and the first missing tooth gear 711 and the second missing tooth gear 712 of the intermediate gear 71 are driven gear 91. And the paper feed roller gear 31 are not engaged with each other.

  When the operation member 6 is rotated to the operating position and the sheet is accommodated on the upper surface of the pressing plate 2, when a paper feeding operation is instructed, the drive shaft 9 is rotated by the rotation of a motor (not shown), and the solenoid 75 is driven. The When the armature 751 is retracted by driving the solenoid 75 and is not engaged with the stepped portion 714, the intermediate gear 71 is rotated in the direction of arrow C by the elastic force of the spring 74. After meshing with the drive gear 91 of the first chipped gear 711, the rotation of the drive shaft 9 is transmitted to the intermediate gear 71, and the intermediate gear 71 continues to rotate in the direction of arrow C. As a result, as shown in FIG. 4, the rib 713 contacts the first end 721 of the arm 72, and the arm 72 swings in the direction of the arrow B ′ against the elastic force of the spring 73.

  As the arm 72 swings in the direction of arrow B ′, the second end 722 contacts the protrusion 53 of the stopper 5 and rotates the stopper 5 in the direction of arrow E ′ toward the release position. As the stopper 5 rotates in the direction of arrow E ′, the stopper piece 52 does not engage with the recess 22, and the pressing plate 2 swings in the direction of arrow A toward the upper limit position by the elastic force of the spring 4.

  At this time, the second chipped gear 712 meshes with the paper feed roller gear 31 and the paper feed roller 3 starts to rotate, and the paper placed on the pressing plate 2 is fed out.

  The drive of the solenoid 75 is stopped immediately after the intermediate gear 71 starts to rotate in the arrow C direction. When the sheet feed roller 3 makes one rotation, the armature 751 engages with the stepped portion 714, and the rotation of the intermediate gear 71 stops at a rotation position where the first chipped gear 711 does not mesh with the drive gear 91. At the same time, the rotation of the paper feed roller 3 is also stopped.

  As described above, the rotation of the drive shaft 9 is transmitted to the lever 72 via the intermediate gear 71 immediately before the rotation of the paper feed roller 3 is started. Fixing of the pressing member 2 at the lower limit position by the stopper 5 is canceled, and the paper stored in the pressing plate 2 can be reliably fed out by the paper feed roller 3.

  By driving the solenoid 75 each time the intermediate gear 71 makes one rotation, the first chipped gear 711 and the second chipped gear 712 are selectively meshed with the drive gear 91 and the paper feed roller gear 31, respectively, and driven. The rotation of the shaft 9 can be intermittently transmitted to the sheet feed roller 3 by one rotation.

  In FIG. 4, after the pressing plate 2 swings toward the upper limit position, the lever 72 swings from the operating position to the retracted position by the elastic force of the spring 73. At this time, the first end portion 721 contacts a contact portion 713 </ b> A formed continuously with the rib 713. Regarding the radial direction of the intermediate gear 71, the distance from the contact position between the rib 713 including the contact portion 713A and the first end 721 to the axis of the intermediate gear 71 is the rotational direction of the intermediate gear 71 in the arrow C direction. Along gradually along. The lever 72 is decelerated by friction with the contact portion 713A and moves toward the retracted position. For this reason, the impact at the time of contact of the member that restricts the swing of the lever 72 at the retracted position and the lever 72 is alleviated.

  Even when the pressing plate 2 is not in the lower limit position, the lever 72 swings from the operating position to the retracted position after swinging from the retracted position to the operating position each time the sheet is fed by the rotation of the paper feed roller 3. It is possible to prevent the lever 72 that has reached 1 from generating an impact sound. In addition, although the contact part 713A was comprised with the plane, it can also comprise with a circular arc surface.

  Further, after the paper feed roller 3 makes one rotation, the rotation of the intermediate gear 71 stops at a rotational position where the second chipped gear 712 does not mesh with the paper feed roller gear 31, so that the paper feed roller 3 can be freely and independently operated. It can be rotated. For this reason, the operator inserts his / her finger between the upper surface of the pressing plate 2 and the sheet feeding roller 3 with the pressing plate 2 stopped at the lower limit position during the cleaning operation of the sheet feeding roller 3. The stopper 5 does not move from the lock position to the release position even if it is rotated. Thereby, the cleaning operation of the paper feed roller 3 can be easily performed.

  If a clutch is interposed between the paper feed roller 3 and the intermediate gear 71 so that the paper feed roller 3 can be freely rotated in a state where no rotational force is supplied to the paper feed roller 3, the apparatus Increase in size and cost. By using the intermediate gear 71 provided with the chipped gear 712, it is possible to reduce the size and cost of the device.

  FIG. 10 is an enlarged view of the main part of FIG. 9, and is a side view of the second chipped gear and the sheet feeding roller gear in the sheet feeding device. The second chipped gear 712 has the tooth height of the tooth 712A that first meshes with the paper feed roller gear 31 by the rotation of the intermediate gear 71 in the direction of arrow C to be about ½ of the other teeth. Thus, the second chipped gear 712 can be smoothly meshed with the paper feed roller gear 31, and an impact sound can be prevented from being generated when the paper feed roller 3 starts to rotate.

  The intermediate gear 71 including the second chipped gear 712 is made of resin. Inside the second chipped gear 712, an arc-shaped slit 712B extends from the teeth 712A toward the upstream side in the direction of arrow C. Is formed. The teeth 712 </ b> A can be elastically deformed toward the center of the second chipped gear 712 when meshed with the paper feed roller gear 31. Also by this, the second chipped gear 712 can be smoothly meshed with the paper feed roller gear 31.

  The first chipped gear 711 also has a first tooth height that is meshed with the drive gear 91 by rotation of the intermediate gear 71 in the direction of arrow C, so that the first missing gear 711 is about ½ of the other teeth. The chipped gear 711 may be smoothly meshed with the drive gear 91. Moreover, you may form the slit similar to the slit 712B also in the 1st chipped gear 711.

  Finally, the description of the above-described embodiment is to be considered in all respects as illustrative and not restrictive. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

1 is an external view of a facsimile apparatus as a paper processing apparatus to which a paper feeding apparatus according to an embodiment of the present invention is applied. 1 is an external view of a sheet feeding device according to an embodiment of the present invention. FIG. 6 is a side view in which a transmission member of the sheet feeding device in a state where an operation member is in an operating position is omitted. FIG. 6 is a side view in which a sheet feeding roller of the sheet feeding device in a state where an operation member is in an operating position is omitted. It is a side view on the opposite side to FIG. 4 of the transmission member of the paper feeder. FIG. 6 is a side view in which a sheet feeding roller of the sheet feeding device in a state where an operation member is at a stop position is omitted. FIG. 6 is a side view in which a transmission member of the sheet feeding device in a state where an operation member is at a stop position is omitted. FIG. 3 is a side view of the sheet feeding device in a state before feeding. FIG. 9 is a side view of the transmission member of the sheet feeding device on the side opposite to FIG. 8. It is a side view of the 2nd chipped gear and paper feed roller gear in the paper feed device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paper feeder 2 Pressure plate 3 Paper feed roller 4 Coil spring (1st elastic member)
5 Stopper 6 Operation member 7 Transmission member 9 Drive shaft 71 Intermediate gear 72 Lever 73 Spring (second elastic member)
74 Spring (third elastic member)
75 Solenoid (Rotation restricting member)
100-facsimile machine

Claims (4)

A pressing plate supported swingably with the upper end as a fulcrum, and capable of accommodating a plurality of sheets stacked on the upper surface;
A paper feed roller rotatably supported around an axis parallel to the swing axis of the pressing plate above the lower end of the pressing plate;
A first elastic member that urges the lower end of the pressing plate toward an upper limit position in contact with the paper feed roller;
Above the pressing plate, the pressing plate is displaced toward a lower limit position separated from the paper feeding roller by a predetermined distance while rotating from the release position to the locking position around an axis parallel to the swinging axis of the pressing plate. And a stopper that stops at the lock position by engagement with the pressing plate;
Operation to rotate the stopper from the release position to the lock position while rotating from the stop position to the operating position while being rotated freely around the axis parallel to the rocking axis of the pressure plate above the pressure plate. Members,
A transmission member that selectively transmits the rotation of the drive shaft to the paper feed roller, the transmission member releasing the engagement between the stopper and the pressing plate when the paper feed roller rotates;
Equipped with a,
The transmission member is
An intermediate gear that meshes with a drive gear attached to the drive shaft and a paper feed roller gear attached to the paper feed roller, and has a radially projecting rib;
A first end that is pivotally supported between a retracted position and an operating position and is in contact with the rib by rotation of the intermediate gear at the retracted position, and the stopper is moved to the release position at the operating position. A lever having a second end to rotate;
A second elastic member for urging the lever toward the retracted position;
With
The lever swings from the retracted position to the operating position when the rib contacts the first end by rotation of the intermediate gear,
The rib has a shape in which a distance from a contact position with the first end portion in the radial direction of the intermediate gear to a shaft center of the intermediate gear is gradually shortened along a rotation direction of the intermediate gear. Paper feeder.   The sheet feeding device according to claim 1, wherein the pressing plate includes a recess with which the stopper is engaged at the lower limit position.   The sheet feeding device according to claim 1, wherein the operation member rotates in synchronization with the stopper. The intermediate gear integrally and coaxially fixes a first chipped gear that selectively meshes with the drive gear and a second chipped gear that selectively meshes with the paper feed roller gear. Formed,
A rotation restricting member that selectively restricts rotation of the intermediate gear at a position where the first chipped gear and the second chipped gear do not mesh with the drive gear and the paper feed roller gear, respectively.
A third elastic member that urges the intermediate gear in a rotational direction transmitted from the drive gear to the first chipped portion;
Sheet feeding apparatus according to still one of claims 1 to 3 comprising a.

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