JP2014165625A - Transmission device for automatic document feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission device for an automatic document feeder.SOLUTION: A transmission device 20 for an automatic document feeder, disposed between a pickup device 10, a feed roll 11, and an ejection device 12, includes: a unidirectional gear set 30; a first swing arm for making a first roll set contact to either the pickup device or the ejection device by connection to the first roll set; and a second swing arm for making a second roll set contact to either the pickup device or the ejection device by connection to the second roll set. When the first swing arm swings toward a first position, the second swing arm swings toward a fourth position. Also, when the first swing arm swings toward a second position, the second swing arm swings toward a third position.

Description

  The present invention relates to a kind of power transmission device, and more particularly to a kind of transmission device applied to an automatic document feeder.

  Many scanners are equipped with an automatic document feeder in order to increase the efficiency of mass scanning and realize the automatic duplex scanning function.

  Please refer to FIG. Shown in the figure is a display diagram of a known automatic document feeder. In the automatic document feeder, there is a channel for transporting a document, and the channels are respectively provided with a feed cartridge 14, a feed channel 13, a scanning region 17, a discharge channel 15, and a discharge cartridge 16 from the upstream to the downstream. A document flip channel 18 is connected between the channel 13 and the discharge channel 15.

  In order to transport the document and pass through each of the above-mentioned channels, each channel is provided with a number of different transmissions. For example, a pickup device 10 is installed at the inlet end of the feed channel 13, a plurality of feed rolls 11 are installed along the feed channel 13 and the discharge channel 15, and a discharge device is provided at the outlet portion of the discharge channel 15. 12 is installed.

  When a user scans a document, the pick-up device 10 in the automatic document feeder depresses the document in the feed cartridge 14 and starts feeding the document to the feed channel 13 of the automatic document feeder. However, after the document enters the feed channel 13 and reaches the feed roll 11, the pick-up device 10 can also be reversed and raised to prevent duplicate document feeds.

  After the document enters the feed channel 13, the feed roll 11 installed along the feed channel 13 and the discharge channel 15 is fixed and rotates in the same direction, and feeds the document to the scanning region 17, below the scanning region 17. The scanning unit reads the image, and sends the scanned document to the discharge cartridge 16.

  The discharge device 12 located at the outlet portion of the discharge channel 15 is provided with a roll 121 and a movable press roll 123. During general one-sided scanning, the press roll 123 continues to press the roll 121 and also presses the document in the forward direction. However, when a double-sided scan is required for the document, the discharge device 12 reverses and flips the document in the opposite direction when the first scan of the document is complete and needs to leave the discharge channel 15. Documents that are fed into channel 18 and pass through the flip channel 18 are returned again into the feed channel 13 as well as the document is flipped. In addition, after the document is turned over, the press roll 123 is lowered to prevent the document from being caught by the press roll 123 when the positions of the discharge device 12 on the two sides of the front edge and the rear edge of the document intersect. To separate from the roll 121.

  As can be seen from the above description, the pickup device 10, the feed roll 11, and the discharge device 12 are considerably different in any of the time point of operation and the direction of rotation. Basically, the feed roll 11 continuously rotates in the same direction, the pickup device 10 and the discharge device 12 change the rotation direction depending on the position of the document, and the roll 121 and the press roll 123 of the discharge device 12 are appropriate. You must leave at the right time. As a result, most known automatic document feeders employ a structure in which at least two motors or devices such as clutches or solenoid valves are used to drive the pickup device 10, feed roll 11 and discharge device 12, respectively. However, disposing more motors indicates that the manufacturing cost is increased, and it is difficult to reduce the volume.

  In order to solve the above-mentioned drawbacks, it is necessary to improve the existing automatic document feeder and the transmission device therein.

  The main object of the present invention is to provide a transmission device that drives a pickup device, a feed roll, and a discharge device with a single drive motor, thereby reducing the manufacturing cost and reducing the volume of the automatic document feeder. It is to achieve.

  In order to achieve the above object, the transmission device of the automatic document feeder of the present invention is mounted between the pickup device, the feed roll and the discharge device, and transmits the transmission torque of the drive motor, which includes the following.

  The drive gear set is installed between the pickup device and the discharge device, and is driven by a drive motor.

  The first swing arm is driven by a drive gear set, and is connected to a first roll set that moves with the first swing arm. The first swing arm is moved to a first position due to a difference in the rotation direction of the drive gear set. Alternatively, it swings to the second position, and the first roll set and the pickup device are brought into contact with each other to transmit the transmission torque to the pickup device, or the first roll set is brought into contact with the discharge device and transmitted. Torque is transmitted to the ejector.

  The second swing arm is driven by a drive gear set, and a second roll set that moves with the second swing arm is connected. The second swing arm is moved to a third position by a difference in the rotation direction of the drive gear set. Alternatively, it swings to the fourth position, and the second roll set and the pickup device are brought into contact with each other to transmit the transmission torque to the pickup device, or the second roll set is brought into contact with the discharge device and transmitted. Torque is transmitted to the ejector.

  The unidirectional gear set is driven by the drive gear set, and transmits the transmission torque in the same direction to the feed roll regardless of which direction the drive gear set rotates.

  Of these, when the first swing arm swings toward the first position, the second swing arm swings toward the fourth position, and when the first swing arm swings toward the second position. The second swing arm swings toward the third position.

  In a preferred embodiment, the drive gear set includes a first drive gear driven by a drive motor, a reverse gear set meshing with the first drive gear, and a second drive gear meshing with the reverse gear set. . The first swing arm and the first roll set are connected to and driven by the first drive gear, and the second swing arm and the second roll set are connected to the second drive gear. Connected and driven by the second drive gear.

  In a preferred embodiment, the first roll set includes at least a first actuate gear and a torque limiter, the first actuate gear and the drive gear set mesh, and the first swing arm via the torque limiter. It is pivoted with. The second roll set includes at least a second actuating gear and a torque limiter, the second actuating gear meshes with the drive gear set and is pivotally connected to the second swing arm by the torque limiter.

  In a preferred embodiment, the second swing arm comprises a first free end and a second free end, and the second roll set described above includes a second actuated gear and a reverse gear set. Among them, the second actuating gear and the second driving gear mesh with each other and are pivoted at the first free end, and the reverse gear set meshes with the second driving gear and pivoted at the second free end. Is in the third position, the second actuating gear contacts and meshes with the pickup device, and transmits the transmission torque to the pickup device. When the second swing arm is in the fourth position, the reverse gear set contacts and meshes with the discharging device, and transmits the transmission torque to the discharging device.

  In a preferred embodiment, the unidirectional gear set includes a third drive gear, a third swing arm pivoted on the third drive gear, a third actuated gear pivoted on the third swing arm, and a fourth actuator gear. And an export roll connected to the feed roll and a second reverse gear set meshed with the export roll. Among them, the third swing arm and the third drive gear are pivotally connected and have two free ends, and the third actuate gear and the fourth actuate gear both mesh with the third drive gear and are respectively connected via the torque limiter. It is pivotally connected to the two free ends of the 3 swingarm. The third swing arm swings to the fifth position or the sixth position depending on the rotation direction of the third drive gear, and contacts the third actuate gear and the export roll to transmit the transmission torque to the feed roll, or The fourth actuating gear and the second reverse gear set are brought into contact and the transmission torque is transmitted to the feed roll so that the transmission torque transported to the feed roll is maintained in the same direction throughout.

  In a preferred embodiment, the torque limiter is a compression spring, and both ends of the compression spring abut against the actuating gear and the swing arm, respectively.

  In a preferred embodiment, the discharge device includes a roll and a press roll separating swing arm installed so as to face the roll, and a cam is installed on one side of the press roll separating swing arm and coaxial with the cam. And a press roll that receives control of the press roll separating swing arm. When the first swing arm swings to the second position, the first roll set and the toothless gear mesh with each other and drive the discharge device. When the second swing arm swings to the fourth position, that is, the second roll set and the toothless gear mesh and drive the discharge device. When the missing gear rotates, the cam installed coaxially with the missing gear is driven and rotated, and the press roll separating swing arm is driven and swung by this. Therefore, when the first roll set and the second roll set drive and rotate the missing gear, they stop at the position of the missing tooth portion.

  In a preferred embodiment, a tension spring is provided on the axis of the missing tooth gear, and the tension spring applies a resistance force to the missing tooth gear to ensure that the missing tooth gear rotates to reach the missing tooth portion. To be stopped.

  Overall, the feature of the present invention is that a plurality of swing arms are installed, and different swing arms use alternating swings that occur when the rotation direction of the drive gear is different, and the transmission torque is circulated to pick up and discharge the pickup device. The transmission torque output time is controlled using the time difference between the swing arm and the reciprocal swing between the swing arm and the device. Thereby, the volume and production cost of the automatic document feeder can be effectively reduced without using one motor and attaching an extra controller.

It is sectional drawing of a known automatic document feeder. It is a three-dimensional view of a transmission device, a pickup device, a discharge device, and a feed roll in the present invention. It is a three-dimensional view of the transmission device in the present invention. It is an operation | movement display figure by which the 1st swing arm of the transmission of this invention rock | fluctuates to a 2nd position, and the 2nd swing arm rock | fluctuates to a 3rd position. It is an operation | movement display figure by which the 1st swing arm of the transmission of this invention rock | fluctuates to a 1st position, and a 2nd swing arm rock | fluctuates to a 4th position. It is a three-dimensional view of the unidirectional gear set and feed roll in the present invention. It is an operation | movement display figure which the 3rd swing arm of the unidirectional gear set in this invention rock | fluctuates to a 6th position. It is an operation | movement display figure which the 3rd swing arm of the unidirectional gear set in this invention rock | fluctuates to a 5th position. It is a combination diagram of a torque limiter in the present invention. It is sectional drawing of the torque limiter in this invention. It is an operation | movement display figure of the automatic document feeder in this invention. It is an operation | movement display figure of the automatic document feeder in this invention. It is an operation | movement display figure of the automatic document feeder in this invention. It is an operation | movement display figure of the automatic document feeder in this invention. It is an operation | movement display figure of the automatic document feeder in this invention. It is an operation | movement display figure of the automatic document feeder in this invention. It is an operation | movement display figure of the automatic document feeder in this invention. It is a combination figure of the discharge device in the present invention.

  In order to describe in detail the technical contents, structural features, and objects to be achieved of the present invention, examples will be described below in combination with the drawings.

  Please refer to FIG. 2 to FIG. The transmission device 20 of the present invention is applied to an automatic document feeder, and is attached between the pickup device 10, the feed roll 11 and the discharge device 12, so that the transmission torque of the drive motor 19 can be accurately measured. 11 and the discharging device 12.

  The transmission device 20 includes a drive gear set 21. The drive gear set 21 is installed between the pickup device 10 and the discharge device 12 and is driven by the drive motor 19. In this embodiment, the drive gear set 21 includes a first drive gear 211 and a second drive gear 212, and the roll 121 of the discharge device 12 is combined with the second drive gear 212. The first drive gear 211 and the second drive gear 212 are connected via a reverse gear 213, whereby the first drive gear 211 and the second drive gear 212 rotate in the same direction from start to finish. .

  The unidirectional gear set 30 is driven by the drive gear set 21, and the drive gear set 21 transmits the transmission torque in the same direction to the feed roll 11 via the unidirectional gear set 30 regardless of which direction the drive gear set 21 rotates.

  The first swing arm 22 is pivoted coaxially with the first drive gear 211 and on the free end 221 of the first swing arm 22, the first roll set 23 is pivoted, and in the first roll set 23, A first actuating gear 24 and a torque limiter are included, and the first actuating gear 24 meshes with the first drive gear 211 and is pivotally connected to the first swing arm 22 via the torque limiter.

  The torque limiter has a maximum allowable torque value, and if the torque between the first actuated gear 24 and the first swing arm 22 does not exceed the maximum allowable torque value, The first swing arm 22 does not generate relative rotation. As a result, when the first drive gear 211 rotates, the first swing arm 22 moves in the first position (shown in FIG. 4B) and the second position (shown in FIG. 4A) as the first drive gear 211 rotates. Oscillates between and switches the position. When the first swing arm 22 is in the first position, the first roll set 23 and the pickup device 10 are in contact with each other. When the first swing arm 22 is in the second position, the first roll set 23 comes into contact with the discharge device 12. When the first roll set 23 comes into contact with the pickup device 10 or the discharge device 12 and cannot swing continuously, the first actuating gear 24 generates relative rotation with the first swing arm 22 and generates rotational torque. The data is transmitted to the pickup device 10 or the discharge device 12 through the first roll set 23.

  The second swing arm 25 is pivotally connected coaxially with the second drive gear 212 and includes a first free end 251 and a second free end 252, and a second roll set 26 is pivoted on the second swing arm 25. The second roll set 26 is provided with a second actuate gear 28, a torque limiter, and a reverse gear set 27. The second actuate gear 28 meshes with the second drive gear 212 and passes through the torque limiter. Pivoted to the first free end 251 of the second swing arm 25, the reverse gear set 27 is pivoted to the second free end 252 and meshes with the drive gear set 21.

  The torque limiter similarly has a maximum torque allowable value, so that when the second drive gear 212 rotates, the second swing arm 25 is driven, and the second drive gear 212 rotates in accordance with the direction of rotation. Swing and switch between the 3 position (shown in FIG. 4A) and the 4th position (shown in FIG. 4B). When the second swing arm 25 is in the third position, the second actuating gear 28 contacts and meshes with the pickup device 10 to return to the original position even when the pickup device 10 is raised. When the second swing arm 25 is in the fourth position, the reverse gear set 27 contacts and meshes with the discharge device 12, thereby opening the press roll 123 of the discharge device 12. When the second roll set 26 or the reverse gear set 27 is in contact with the pickup device 10 or the discharge device 12, and the second swing arm 25 subsequently cannot swing, the second roll set 26 picks up the rotational torque. The information is transmitted to the device 10 or the discharging device 12.

  Of these, when the first swing arm 22 swings toward the first position, the second swing arm 25 swings toward the fourth position (shown in FIG. 4B), and the first swing arm 22 moves to the first position. When swinging toward the second position, the second swing arm 25 swings toward the third position (shown in FIG. 4A).

  Please refer to FIG. 5 and FIG. The unidirectional gear set 30 in this embodiment includes a third drive gear 31, a third swing arm 34 pivoted on the third drive gear 31, and a third actuated gear pivoted on the third swing arm 34. 32, a fourth actuate gear 33, an export wheel 35 connected to the feed roll 11, and a second reverse gear set 36 meshed with the export wheel 35. Of these, the third swing arm 34 is pivotally connected to the third drive gear 31 and has a third free end 341 and a fourth free end 342. The third actuated gear 32 and the fourth actuated gear 33 are both provided. It meshes with the third drive gear 31 and is pivotally connected to the third free end 341 and the fourth free end 342 of the third swing arm 34 via torque limiters, respectively. The third swing arm 34 swings and switches between the fifth position and the sixth position according to the rotation direction of the third drive gear 31, and when the third swing arm 34 is in the fifth position (shown in FIG. 6B). ), The third drive gear 31 comes into contact with the export wheel 35 via the third actuate gear 32 and transmits the transmission torque to the feed roll 11. When the third swing arm 34 is in the sixth position (shown in FIG. 6A), the third drive gear 31 contacts the second reverse gear set 36 and the export wheel 35 via the fourth actuate gear 33, and The transmission torque is transmitted to the feed roll 11, so that the transmission torque in the same direction is transmitted to the feed roll 11 in any direction regardless of the direction in which the drive gear set 21 rotates, and the rotation direction of the feed roll 11 is matched. Can do.

  The torque limiter in this embodiment is a compression spring 40, which is fixed to swing arms 22, 25, 34, and both ends thereof are swing arms 22, 25, 34 and actuating gears 24, 28, respectively. , 32, 33 and increase the forward and frictional forces between the swing arms 22, 25, 34 and the actuating gears 24, 28, 32, 33. See FIGS. 7A and 7B. Taking the torque limiter between the first swing arm 22 and the first actuating gear 24 as an example, the first actuating gear 24 and the compression spring 40 are pivotally connected to the free end of the first swing arm 22 and coaxially, and The compression spring 40 is fixed by a screw 41 and applies a forward force to the first actuating gear 24. Thereby, when the transmission torque applied between the first swing arm 22 and the first actuating gear 24 is smaller than the frictional resistance, the first swing arm 22 and the first actuating gear 24 do not generate relative rotation, Relative rotation occurs between the first swing arm 22 and the first actuated gear 24 only after the transmission torque exceeds the maximum static friction force between them.

  Please refer to FIG. The discharge device 12 in this embodiment includes a roll 121, a press roll separation swing arm 122 installed so as to face the roll 121, and a cam 124 on one side of the press roll separation swing arm 122. A non-tooth gear 125 installed coaxially and a press roll 123 that receives control of the press roll separation swing arm 122 are installed. When the first swing arm 22 swings to the second position, the first roll set 23 and the toothless gear 125 engage with each other and drive the discharge device 12. When the second swing arm 25 swings to the fourth position, the second roll set 26 is switched so as to mesh with the toothless gear 125 and the discharge device 12 is driven. When the missing tooth gear 125 rotates, the cam 124 installed coaxially with the missing tooth gear 125 is driven and rotated synchronously, and thereby, a force is applied to the press roll separating swing arm 122 to swing, Since the missing tooth portion 127 is provided on the missing tooth gear 125, when the first roll set 23 and the second roll set 26 drive and rotate the missing tooth gear 125, at the position of the missing tooth portion 127. You can stop.

  As a result, when the second swing arm 25 swings to the fourth position (shown in FIG. 4B), the reverse gear set 27 is engaged with and connected to the toothless gear 125 and rotated in the clockwise direction. At this time, the missing tooth gear 125 drives the cam 124 and rotates 90 degrees together, and presses the press roll separating swing arm 122 to rotate the press roll 123 to the roll 121 and the missing tooth gear 125 to the missing tooth position 128. Until it is close. Refer now to FIG. 13A. At this time, the reverse gear set 27 continues to rotate, but the toothless gear 125 cannot continue to rotate. However, the press roll 123 has already stopped the roll 121 completely.

  On the other hand, when the first swing arm 22 swings to the second position (as shown in FIG. 4A), the first roll set 23 meshes with and is connected to the missing gear 125 and rotates clockwise. At this time, the missing tooth gear 125 drives the cam 124 to rotate 270 degrees and pushes the press roll separation swing arm 122 to rotate the press roll 123, and the missing tooth gear 125 rotates to the missing tooth position 128. Until the roll 121 is separated. See also FIG. 13B. At this time, the first roll set 23 continues to rotate, but the missing tooth gear 125 cannot continue to rotate, and the press roll 123 is already completely separated from the roll 121.

  In addition, a tension spring 126 is provided coaxially on the missing tooth gear 125, and the tension spring 126 applies a resistance force to the missing tooth gear 125, and the missing tooth gear 125 is reliably rotated to the missing tooth portion 127. Make sure to stop, and make sure that the rotation speed is not too fast.

  With the transmission device 20 and the automatic document feeder of the present invention, the operation flow when performing single-sided scanning is as follows.

  Refer now to FIG. 8A. The document is located in the feed cartridge 14 when the automatic document feeder starts operation. The drive motor 19 rotates in the clockwise direction, and the first drive gear 211 and the second drive gear 212 are rotated in the clockwise direction, the first swing arm 22 is moved toward the first position, and the transmission torque is picked up. Tell the device 10. At this time, the pickup device 10 applies pressure toward the feed cartridge 14 and feeds the document into the feed channel 13. At this time, the pickup device 10 continuously feeds the document into the feed channel 13, but the speed of the feed roll 11 is faster than that of the pickup device 10, whereby the document previously fed to the feed channel 13 and the feed channel 13 later. There is a distance and speed difference between the documents sent to, and they cannot overlap. The pickup device 10, the feed roll 11 and the discharge device 12 all rotate in the same direction, so that the document sequentially passes through the feed channel 13, the scanning region 17 and the discharge channel 15, and finally the discharge cartridge 16. Enter.

  The operation flow for performing double-sided scanning on a document is as follows.

  See FIG. 8A. The document is located in the feed cartridge 14 when the automatic document feeder begins operation. The drive motor 19 rotates in the clockwise direction, and the first drive gear 211 and the second drive gear 212 are rotated in the clockwise direction, the first swing arm 22 is moved toward the first position, and the transmission torque is picked up. Tell the device 10. At this time, the pickup device 10 applies pressure toward the feed cartridge 14 and feeds the document into the feed channel 13.

  See FIG. 8B. In order to prevent the document from passing through the discharge device 12 and entering the discharge cartridge 16, after the document has entered between the feed roll 11 and the scanning area 17, the drive motor 19 is switched to counterclockwise rotation. That is, the first drive gear 211 and the second drive gear 212 receive the drive of the drive motor 19 and rotate counterclockwise to swing the first swing arm 22 toward the second position, The swing arm 25 is swung toward the third position. At this time, the feed roll 11 is still maintained in the same rotational direction under the action of the unidirectional gear set 30, but the discharge device 12 is switched to rotate in the direction of transporting the document upstream. Thus, the document is prevented from being delivered to the discharge cartridge 16, and the pickup device 10 is lifted upward by the driving of the second roll set 26 to prevent contact with the document.

  Subsequently, the scanned document needs to be turned over, and in order to turn over the document, the rear end of the document needs to be completely separated from the scanning area 17, and then the document needs to be further fed into the inside-out channel 18. See FIGS. 9A and 9B. In order to move the trailing edge of the document away from the scanning area 17, the leading edge of the document must first pass through the ejection device 12. However, when the drive motor 19 rotates counterclockwise, the direction of the document transported by the discharge device 12 and the feed roll 11 is exactly opposite, so that after the document reaches the discharge device 12, the two directions simultaneously. Can be damaged by the power of In order to prevent the document from being damaged, the first roll set 23 comes into contact with the toothless gear of the discharge device 12 after the first swing arm 22 rotates around the second drive gear 212 and presses the discharge device 12. Separate the roll from the roll. As a result, the scanned document is smoothly passed through the discharge channel 15 and the discharge device 12 and is not obstructed by the discharge device 12. See also FIGS. 10A and 10B. After the document has completed scanning the first side and the trailing edge of the document has completely left the scanning area 17, the drive motor 19 switches to a clockwise rotation. At this time, the first drive gear 211 and the second drive gear 212 rotate in the clockwise direction, whereby the second swing arm 25 moves toward the fourth position and the second roll set 26 is moved to the toothless gear 125. The press roll 123 of the discharge device 12 is driven to the second roll set 26 and is restored to a position where it comes into contact with the roll 121. At this time, both the roll 121 and the feed roll 11 of the discharge device 12 rotate in the direction of transporting the document to the discharge cartridge 16 until the document completely enters the discharge channel 15.

  On the other hand, the first swing arm 22 also moves toward the first position. In the process of the document entering the discharge channel 15, the first swing arm 22 moves toward the first position, but does not yet contact the pickup device 10. After the document has fully entered the discharge channel 15, the drive motor 19 rotates counterclockwise, thereby rotating the roll 121 backward and pulling the document located in the discharge channel 15 back to the flip channel 18. At this time, the first swing arm 22 moves toward the second position, and when the document pulled back from the discharge device 12 passes through the inside-out channel 18, the first roll set 23 of the first swing arm 22 moves to the missing gear. Mesh with 125.

  The document pulled back from the discharge device 12 passes through the flip channel 18 and is turned over. At this time, the press roll 123 is already completely separated from the roll 121 and is kept open. At the same time, the document enters the scanning area 17 again and the second surface is scanned. At this time, the first swing arm 22 does not come into contact with the pickup device 10, and thus the pickup device 10 does not start document feeding.

  After the double-sided scanning is completed, the steps shown in FIGS. 10A to 10B described above may be further repeated, the document may be pulled back to the flip channel 18 again, the second turn may be performed, and the document may be returned to the front.

  Please refer to FIG. After the document is restored to the front side in the second flip, the drive motor 19 continues to rotate in the clockwise direction, and the document can be discharged to the discharge cartridge 16. The pickup device 10 simultaneously applies pressure to the document and continuously feeds the document. Returning to the step shown in FIG. 8A, a new document feed is started.

  Overall, the transmission device according to the present invention is characterized by the fact that a plurality of swing arms and toothless gears are installed, and the transmission torque is obtained by utilizing alternating swinging that occurs when different swing arms have different rotation directions. It circulates and is transported to the pickup device, the discharge device and the feed roll, and the output time of the transmission torque is controlled using the time difference of the reciprocating swing between the swing arms. In addition, when the missing gear rotates to reach the missing tooth portion, the press roll is opened and closed by utilizing the characteristic that it does not rotate any more. Thus, the volume and production cost of the automatic document feeder can be effectively reduced without using a single motor and installing an extra controller.

DESCRIPTION OF SYMBOLS 10 Pickup apparatus 11 Feed roll 12 Discharge apparatus 121 Roll 122 Press roll separation | swing swing arm 123 Press roll 124 Cam 125 Missing gear 126 Tension spring 127 Missing part 13 Feed channel 14 Feed cartridge 15 Ejection channel 16 Ejection cartridge 17 Scanning area 18 Reverse Channel 19 Drive motor 20 Transmission device 21 Drive gear set 211 First drive gear 212 Second drive gear 213 Reverse gear 22 First swing arm 221 Free end 23 First roll set 24 First actuated gear 25 Second swing arm 251 First free end 252 Second free end 26 Second roll set 27 Reverse gear set 28 Second actuated gear 30 Unidirectional gear set 31 Third drive gear 32 Third actuated gear 33 Fourth a Chuetogia 34 third swing arm 341 third free end 342 fourth free end 35 export wheels 36 second reverse gear set 40 a compression spring 41 screw

Claims (9)

In a transmission device of an automatic document feeder, the transmission device is mounted between a pickup device, a feed roll, and a discharge device, and transmits a transmission torque of a drive motor.
A drive gear set, which is installed between the pickup device and the discharge device and driven by the drive motor;
A first swing arm is connected to a first roll set driven by the drive gear set and moved along with the first swing arm, and the first swing arm depends on a difference in rotation direction of the drive gear set. Oscillate to the first position or the second position, contact the first roll set with the pickup device, and transmit the transmission torque to the pickup device, or contact the first roll set with the discharge device The first swing arm for transmitting a transmission torque to the discharging device,
A second swing arm that is driven by the drive gear set and is connected to a second roll set that moves with the second swing arm, and the second swing arm is driven by a difference in rotation direction of the drive gear set; Oscillate to the third position or the fourth position, bring the second roll set and the pickup device into contact, and transmit the transmission torque to the pickup device, or contact the second roll set with the discharge device And transmitting the transmission torque to the discharging device, the second swing arm,
A unidirectional gear set, wherein the unidirectional gear set is driven by the drive gear set and transmits a transmission torque in the same direction to the feed roll regardless of which direction the drive gear set rotates;
Including the above, when the first swing arm swings toward the first position, the second swing arm swings toward the fourth position, and the first swing arm swings toward the second position. The automatic document feeder transmission device, wherein the second swing arm swings toward the third position when swinging toward the third position.   2. The transmission device for an automatic document feeder according to claim 1, wherein the drive gear set includes a first drive gear driven by a drive motor, a reverse gear set meshing with the first drive gear, and the reverse gear set. An intermeshing second drive gear, wherein the first swing arm and the first roll set are connected to and driven by the first drive gear, the second swing arm and the second A transmission device for an automatic document feeder, wherein the roll set is connected to and driven by the second drive gear.   2. The automatic document feeder transmission according to claim 1, wherein the first roll set includes at least a first actuating gear and a torque limiter, the first actuating gear and the driving gear set are engaged, and the torque limiter. And the second roll set includes at least a second actuating gear and a torque limiter, the second actuating gear meshes with the drive gear set, and by the torque limiter An automatic document feeder transmission device characterized by being pivotally connected to a second swing arm.   4. The automatic document feeder transmission device according to claim 3, wherein the second swing arm includes a first free end and a second free end, and the second roll set includes a second actuated gear and a reverse gear set. Of which, the second actuated gear and the second drive gear mesh and are pivoted at the first free end, the reverse gear set meshes with the second drive gear and the second free end When the second swing arm is located at the third position, the second actuating gear contacts and meshes with the pickup device, and transmits a transmission torque to the pickup device. When in the fourth position, the reverse gear set contacts and meshes with the discharge device and transmits a transmission torque to the discharge device. Transmission of cement feeder.   5. The transmission device for an automatic document feeder according to claim 4, wherein the torque limiter is a compression spring, and two ends thereof abut against the actuate gear and the swing arm, respectively, so that the frictional force that inhibits the rotation of the actuate gear. A transmission device for an automatic document feeder, characterized by generating   2. The automatic document feeder transmission according to claim 1, wherein the unidirectional gear set includes a third drive gear, a third swing arm pivoted on the third drive gear, and a pivot on the third swing arm. A third actuating gear and a fourth actuating gear, and an export roll connected to the feed roll and a second reverse gear set meshingly connected to the export roll, wherein the third swing arm and the The third drive gear is pivotally connected and has two free ends, the third actuate gear and the fourth actuate gear both mesh with the third drive gear and the third swing arm via a torque limiter, respectively. The third swing arm swings to the fifth position or the sixth position depending on the rotation direction of the third drive gear. The third actuating gear and the export roll are brought into contact with each other to transmit transmission torque to the feeding roll, or the fourth actuating gear and the second reverse gear set are brought into contact with each other and transmission torque is transmitted to the feeding roll. A transmission device for an automatic document feeder, characterized in that the transmission torque transported to the feed roll is maintained in the same direction throughout.   7. The transmission device for an automatic document feeder according to claim 6, wherein the torque limiter is a compression spring, and two ends thereof abut against an actuating gear and a swing arm, respectively.   2. The transmission device for an automatic document feeder according to claim 1, wherein the discharge device includes a roll and a press roll separating swing arm installed so as to face the roll, and on one side of the press roll separating swing arm. A cam, a toothless gear installed coaxially with the cam, and a press roll that receives control of the press roll separating swing arm are provided, and when the first swing arm swings to the second position, The roll set and the toothless gear mesh and drive the discharge device. When the second swing arm swings to the fourth position, that is, when the second roll set and the missing gear engage and drive the discharge device, and the missing gear rotates, it is synchronized with the missing gear synchronously. Since the installed cam is driven and rotated, and the press roll separation swing arm is driven and swings, and the missing tooth portion is provided on the missing gear, the first roll set and the second roll An automatic document feeder transmission device, characterized in that when the two-roll set drives and rotates the missing gear, it stops at the position of the missing tooth portion.   9. The transmission device for an automatic document feeder according to claim 8, wherein a tension spring is provided coaxially with the toothless gear, the tension spring applies a resistance force to the toothless gear, and the toothless gear rotates. A transmission device for an automatic document feeder, which is surely stopped when it reaches a missing tooth portion.

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