TW201431707A - Transmitting device for automatic document feeder - Google Patents

Abstract

A Transmission device for an automatic document feeder located between a pickup device, transmitting rollers and a discharge device includes a driving gear set; a one-way gear set driven by the driving gear set to keep transmitting rollers rotating in the same direction; a first swing arm connected with a first roller set and swings between a first position and a second position to make the first roller set contact with the pickup device or the discharge device; and a second swing arm connected with a second roller set which swings between a third position and a fourth position to make the second roller set contact with the pickup device or the discharge device; wherein, when the first swing arm swings to the first position, the second swing arm will swing to the fourth position; and when the first arm swings to the second position, the second swing arm will swing to the third position.

Description

Automatic feeder drive

The invention relates to a power transmission device, in particular to a transmission device applied to an automatic paper feeder.

In order to improve the efficiency of a large number of scanning and to achieve automatic double-sided scanning, many scanner machines are equipped with an automatic paper feeder.

Referring now to Figure 1, there is shown a schematic view of a conventional automatic paper feeder having a passage for conveying paper from upstream to downstream, respectively, a tray 14, a paper feed passage 13 The scanning area 17, the paper exit passage 15, and the paper discharge tray 16 are disposed between the paper feed passage 13 and the paper discharge passage 15 and are provided with a turning passage 18.

In order to transport the documents through the above-mentioned respective channels, a plurality of different transmission devices are respectively arranged along the respective channels. For example, the paper take-up device 10 disposed at the entrance end of the paper feed path 13, the plurality of paper feed rollers 11 disposed along the paper feed path 13 and the paper discharge path 15, and the paper discharge device 12 disposed at the exit of the paper discharge path 15 .

When the user scans the document, the paper picking device 10 in the automatic paper feeder presses the document in the paper feed cassette 14 and starts feeding the document into the paper feed path 13 of the automatic paper feeder; After the paper path 13 reaches the paper feed roller 11, the paper take-up device 10 is reversed again to avoid repeated paper feed.

After the document enters the paper feed path 13, the paper feed roller 11 disposed along the paper feed path 13 and the paper discharge path 15 is fixedly rotated in the same direction to convey the document to the scanning area 17 by the scanning unit below the scanning area 17. To read the image and send the scanned file to the output tray 16.

The paper discharge device 12 located at the exit of the paper exit passage 15 is provided with a roller 121 and a movable pressure wheel 123; generally, the single-sided scanning pressure roller 123 continuously presses the roller 121 and applies force to the document, but if When the document needs to be scanned on both sides of the file, when the document finishes scanning on the first side and is about to leave the paper exit path 15, the paper discharge device 12 will reverse and return the document to the reverse channel 18 in turn. The document of the face channel 18 will return to the paper feed path 13 again and the document will be turned over. And after the document is turned over, the pressure wheel 123 will be lowered to be separated from the roller 121 in order to prevent the two sides of the document from being staggered at the position of the paper discharge device 12 when the document is staggered and jammed.

As apparent from the above, the paper take-up device 10, the paper feed roller 11 and the paper discharge device 12 have considerable differences in the timing of the operation and the direction of the rotation. The paper feed roller 11 basically continues to rotate in the same direction, and the paper take-up device 10 and the paper discharge device 12 need to change the rotation direction according to the position of the document, and the roller 121 of the paper discharge device 12 and the pressure roller 123 are appropriate. It must be opened again. Therefore, in the conventional automatic paper feeder, at least two motors or a device such as a clutch or a solenoid valve are used, and the paper take-up device 10, the paper feed roller 11 and the paper discharge device 12 are respectively driven, but more motors are arranged. This means that the manufacturing cost is higher and the volume is not easily miniaturized.

In order to solve the above drawbacks, it is necessary to improve the existing automatic paper feeder and the transmission therein.

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a transmission device that simultaneously drives a paper take-up device, a paper feed roller, and a paper discharge device with a single drive motor to achieve cost reduction and reduce the volume of the automatic paper feeder.

In order to achieve the above object, the transmission device of the automatic paper feeder of the present invention is disposed between the paper taking device, the paper feed roller and the paper discharge device to transmit the driving torque of the drive motor, which comprises:

a drive gear set disposed between the paper take-up device and the paper discharge device and driven by the drive motor;

a first swing arm is driven by the drive gear set and connected with a first roller set that moves with the first swing arm; the first swing arm swings in a first position or a according to a different direction of rotation of the drive gear set a second position, the first roller set is brought into contact with the paper take-up device and the transmission torque is transmitted to the paper take-up device; or the first roller set is brought into contact with the paper discharge device and the transmission torque is transmitted to the paper discharge device;

a second swing arm is driven by the driving gear set and connected with a second roller set that moves with the second swing arm; the second swing arm swings in a third position or according to a different rotation direction of the driving gear set a fourth position, the second roller set is brought into contact with the paper take-up device and the transmission torque is transmitted to the paper take-up device; or the second roller set is brought into contact with the paper discharge device and the transmission torque is transmitted to the paper discharge device;

a one-way gear set, driven by the drive gear set, and transmitting the same direction of transmission torque to the paper feed roller regardless of whether the drive gear set rotates in any direction;

Wherein, 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 to the third position.

In a preferred embodiment, the drive gear set includes a first drive gear driven by the drive motor, a reverse gear set that meshes with the first drive gear, and a second drive gear that meshes with the reverse gear set; The first swing arm and the first roller set are coupled to the first drive gear and driven by the first drive gear, and the second swing arm and the second roller set are coupled to the second drive gear and driven by the second drive gear.

In a preferred embodiment, the first roller set includes at least a first actuating gear and a torque limiter. The first actuating gear meshes with the drive gear set and is pivotally coupled to the first swing arm via a torque limiter. The second roller 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 coupled to the second swing arm by a torque limiter.

In a preferred embodiment, the second swing arm has a first free end and a second free end, and the second roller set includes a second actuating gear and a reverse gear set; wherein, the second The actuating gear meshes with the second drive gear and is pivotally connected to the first free end, and the reverse gear set meshes with the second drive gear and is pivotally connected to the second free end, when the second swing arm is in the third position, The second actuating gear is in meshing engagement with the paper take-up device to transmit the transmission torque to the paper take-up device; when the second swing arm is in the fourth position, the reverse gear set is in meshing engagement with the paper discharge device to transmit the transmission torque to the paper discharge Device.

In a preferred embodiment, the one-way gear set includes a third drive gear, a third swing arm pivotally coupled to the third drive gear, a third actuating gear pivotally coupled to the third swing arm, and a fourth a moving gear, an output wheel coupled to the paper feed roller, and a second reverse gear set coupled to the output wheel; wherein the third swing arm is pivotally coupled to the third drive gear and has two free ends, a third actuating gear and The fourth actuating gears are respectively meshed with the third driving gears and respectively pivotally connected to the two free ends of the third swing arm via a torque limiter; the third swing arm swings according to the different rotating directions of the third driving gears. a fifth position or a sixth position, causing the third actuating gear to contact the output wheel and transmitting the transmission torque to the paper feed roller; or contacting the fourth actuating gear with the second reverse gear set and transmitting the transmission torque to The paper feed roller ensures that the drive torque delivered to the paper feed roller is always in the same direction.

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

In a preferred embodiment, the paper discharge device includes a roller, a pressure wheel opening and closing arm opposite to the roller, and a cam is disposed on a side of the pressure wheel opening and closing arm, and a tooth is disposed coaxially with the cam. a gear, and a pressure wheel controlled by the pressure wheel opening and closing swing arm; when the first swing arm swings to the second position, the first roller set meshes with the missing tooth gear and drives the paper discharge device; and when the second swing arm swings to In the fourth position, the second roller group is engaged with the spur gear and drives the paper discharge device; and when the spur gear rotates, the cam that is coaxially disposed with the spur gear is synchronously driven to rotate, and then the force wheel is opened and closed. The swing arm swings, and the missing tooth gear is provided with a missing tooth portion. Therefore, when the first roller set and the second roller set drive the missing tooth gear to rotate, the position of the missing tooth portion is stopped.

In a preferred embodiment, the shaft of the missing gear is provided with a resistance spring that applies resistance to the missing gear to ensure that the missing gear is turned to the missing portion and will stop.

In summary, the present invention is characterized in that a plurality of swing arms are provided, and the transmission torque is alternately conveyed to the paper take-up device, the paper discharge device and the paper feed roller by using the interactive swing generated by different swing arms in different rotational directions of the drive gears. The output time of the transmission torque is controlled by the time difference between the swing arms swinging back and forth. Therefore, it is only necessary to use one motor and it is not necessary to install an additional controller, which can effectively reduce the volume of the automatic paper feeder and the production cost.

10. . . Paper take-up device

11. . . Paper feed roller

12. . . Paper exit device

121. . . Wheel

122. . . Pressure wheel opening and closing arm

123. . . Pressure wheel

124. . . Cam

125. . . Missing gear

126. . . compressed spring

127. . . Missing tooth

13. . . Paper feed channel

14. . . Paper feed

15. . . Paper exit

16. . . Paper output

17. . . Scanning area

18. . . Flip channel

19. . . Drive motor

20. . . transmission

twenty one. . . Drive gear set

211. . . First drive gear

212. . . Second drive gear

213. . . Reverse gear

twenty two. . . First swing arm

221. . . Free end

twenty three. . . First roller set

twenty four. . . First moving gear

25. . . Second swing arm

251. . . First free end

252. . . Second free end

26. . . Second wheel set

27. . . Reverse gear set

28. . . Second actuating gear

30. . . One-way gear set

31. . . Third drive gear

32. . . Third actuating gear

33. . . Fourth actuating gear

34. . . Third swing arm

341. . . Third free end

342. . . Fourth head

35. . . Output wheel

36. . . Second reverse gear set

40. . . compressed spring

41. . . Screw

Figure 1 is a cross-sectional view of a conventional automatic paper feeder.
Fig. 2 is a perspective view of the transmission device, the paper take-up device, the paper discharge device, and the paper feed roller in the present creation.
Figure 3 is a perspective view of the transmission in the present creation.
4A is a schematic view showing the operation of the first swing arm of the transmission device being swung in the second position and the second swing arm being swung in the third position.
4B is a schematic view showing the action of the first swing arm of the transmission device being swung in the first position and the second swing arm being swung in the fourth position.
Figure 5 is a perspective view of the one-way gear set and the paper feed roller in the present creation.
Fig. 6A is a schematic view showing the operation of the third swing arm of the one-way gear set being swung in the sixth position.
Fig. 6B is a schematic view showing the operation of the third swing arm of the one-way gear set swinging in the fifth position.
Figure 7A is a combination of torque limiters.
Figure 7B is a cross-sectional view of the torque limiter.
Figure 8A is a schematic diagram of the action of the automatic paper feeder in the present creation.
Figure 8B is a schematic view of the operation of the automatic paper feeder in the present creation.
Figure 9A is a schematic diagram of the action of the automatic paper feeder in the present creation.
Figure 9B is a schematic diagram of the action of the automatic paper feeder in the present creation.
Figure 10A is a schematic diagram of the action of the automatic paper feeder in the present creation.
Figure 10B is a schematic diagram of the operation of the automatic paper feeder in the present creation.
Figure 11 is a schematic diagram of the action of the automatic paper feeder in this creation.
Figure 12 is a combination of the paper discharge devices in this creation.

In order to explain the technical content, structural features, objectives and effects of the present invention in detail, the following detailed description is given by way of example.

Referring now to FIGS. 2 to 4, the transmission device 20 of the present invention is applied to an automatic paper feeder, and is disposed between the paper take-up device 10, the paper feed roller 11, and the paper discharge device 12 to drive the motor 19 The transmission torque is correctly transmitted to the paper take-up device 10, the paper feed roller 11, and the paper discharge device 12.

The transmission device 20 includes a drive gear set 21 which is disposed between the paper take-up device 10 and the paper discharge device 12 and is driven by the drive motor 19. In this embodiment, the driving gear set 21 includes a first driving gear 211 and a second driving gear 212, and the roller 121 of the paper discharging device 12 is assembled with the second driving gear 212; The drive gear 211 and the second drive gear 212 are connected via a reverse gear 213 such that the first drive gear 211 and the second drive gear 212 are always rotated in the same direction.

A one-way gear set 30, driven by the drive gear set 21, transmits the same direction of transmission torque to the paper feed roller 11 via the one-way gear set 30, regardless of whether the drive gear set 21 is rotated in any direction.

A first swing arm 22 is coaxially pivotally connected to the first drive gear 211 and pivotally connected to the first end of the first swing arm 22 to provide a first roller set 23, and the first roller set 23 includes a first The moving gear 24 and a torque limiter are meshed with the first drive gear 211 and pivotally connected to the first swing arm 22 via a torque limiter.

The torque limiter has a maximum torque tolerance. If the torque acting between the first actuating gear 24 and the first swing arm 22 does not exceed the maximum torque tolerance, the first actuating gear 24 and the first swing arm 22 will not. Will produce relative rotation. Therefore, when the first driving gear 211 rotates, the first swing arm 22 will be driven in a first position (shown in FIG. 4B) and a second position (in FIG. 4A) as the first driving gear 211 rotates. Switch between the display). When the first swing arm 22 is in the first position, the first roller set 23 is in contact with the paper take-up device 10; and when the first swing arm 22 is in the second position, the first roller set 23 is in contact with the paper discharge device 12. When the first roller set 23 is in contact with the paper take-up device 10 or the paper discharge device 12 and cannot continue to swing, the first actuating gear 24 will rotate relative to the first swing arm 22 and transmit the rotational torque through the first roller. The group 23 is conveyed to the paper take-up device 10 or the paper discharge device 12.

A second swing arm 25 is coaxially coupled to the second drive gear 212 and has a first free end 251 and a second free end 252. The second swing arm 25 is pivotally connected to a second roller set 26. The second roller set 26 is provided with a second actuating gear 28, a torque limiter and a reverse gear set 27. The second actuating gear 28 meshes with the second drive gear 212 and is pivotally connected via a torque limiter. The first free end 251 of the second swing arm 25 is pivotally coupled to the second free end 252 and meshes with the drive gear set 21.

The torque limiter also has a maximum torque tolerance, so that when the second drive gear 212 rotates, the second swing arm 25 will be driven in a third position along with the direction in which the second drive gear 212 rotates (FIG. 4A). The display is switched between the display and a fourth position (shown in FIG. 4B). When the second swing arm 25 is in the third position, the second actuating gear 28 is in contact with the pick-up device 10 to lift the pick-up device 10 to return to the original position; when the second swing arm 25 is in the fourth position, the reverse The gear set 27 is brought into contact with the paper discharge device 12, and the pressure wheel 123 of the paper discharge device 12 is opened. When the second roller set 26 or the reverse gear set 27 is in contact with the paper take-up device 10 or the paper discharge device 12 so that the second swing arm 25 cannot continue to swing, the second roller set 26 transmits the rotational torque to the paper take-up device 10. Or the paper discharge device 12.

Wherein, 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 when the first swing arm 22 swings toward the second position, The second swing arm 25 is swung to the third position (shown in Fig. 4A).

Referring to FIG. 5 and FIG. 6 , the one-way gear set 30 in this embodiment includes a third drive gear 31 , and a third swing arm 34 pivotally connected to the third drive gear 31 . The third actuating gear 32 and the fourth actuating gear 33 on the three-swing arm 34, an output wheel 35 connected to the paper feed roller 11, and a second reverse gear set 36 meshingly coupled to the output wheel 35. The third swing arm 34 is coaxially pivotally connected to the third drive gear 31 and has a third free end 341 and a fourth free end 342. The third actuating gear 32 and the fourth actuating gear 33 are both coupled to the third drive gear. 31 meshing and respectively pivotally connected to the third free end 341 and the fourth free end 342 of the third swing arm 34 via a torque limiter; the third swing arm 34 will be in accordance with the rotational direction of the third drive gear 31 The fifth position and the sixth position are swing-switched. When the third swing arm 34 is in the fifth position (shown in FIG. 6B), the third drive gear 31 is in contact with the output wheel 35 through the third actuating gear 32. The transmission torque is transmitted to the paper feed roller 11; when the second swing arm 25 is at the sixth position (shown in FIG. 6A), the third drive gear 31 passes through the fourth actuation gear 33 and the second reverse gear set 36. Contact with the output wheel 35 and transmit the transmission torque to the paper feed roller 11, so that the drive torque of the same direction can be transmitted to the paper feed roller regardless of the rotation of the drive gear set 21 in any direction. 11, so that the direction of rotation of the sheet supply roller 11 remains consistent.

The torque limiter in this embodiment is a compression spring 40 that is locked to the swing arms 22, 25, 34 and has its ends abut against the swing arms 22, 25, 34, respectively, and actuation. The gears 24, 28, 31 are placed to increase the positive and frictional forces between the swing arms 22, 25, 34 and the actuating gears 24, 28, 31. Referring to 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 coaxially pivoted to the first swing arm. The free end of 22, and the compression spring 40 is locked with a screw 41 to apply a positive force to the first actuating gear 24. Therefore, when the driving torque applied between the first swing arm 22 and the first actuating gear 24 is less than the frictional resistance, the first swing arm 22 and the first actuating gear 24 do not rotate relative to each other until the transmission torque exceeds two. The relative static rotation between the first swing arm 22 and the first actuating gear 24 occurs when the maximum static friction between the two is achieved.

Referring to FIG. 12, the paper discharge device 12 in this embodiment includes a roller 121, a pressure wheel opening and closing arm 122 disposed opposite the roller 121, and a cam on a side of the pressure wheel opening and closing arm 122. 124, a missing tooth gear 125 disposed coaxially with the cam 124, and a pressure wheel 123 controlled by the pressure wheel opening and closing swing arm 122; when the first swing arm 22 is swung to the second position, the first roller set 23 and the missing tooth The gear 125 meshes and drives the paper discharge device 12; when the second swing arm 25 swings to the fourth position, the second roller group 26 is engaged with the missing gear 125 and drives the paper discharge device 12; and the missing gear 125 rotates When the cam 124 disposed coaxially with the missing tooth gear 125 is synchronously driven to rotate, and then the force is applied to swing the pressure wheel opening and closing swing arm 122, the missing tooth gear 125 is provided with the missing tooth portion 127, so when the first roller set 23 When the second roller set 26 drives the spur gear 125 to rotate, the position of the edentulous portion 127 will be stopped.

Therefore, when the second swing arm 25 swings to the fourth position (as shown in FIG. 4B); the reverse gear set 27 will engage the connection missing tooth gear 125 for clockwise rotation, and the missing tooth gear 125 will drive The cam 124 rotates 90 degrees together and pushes the pressure wheel to open and close the swing arm 122 to bring the pressure wheel 123 closer to the roller 121 until the missing tooth gear 125 is turned to the missing tooth position 128. Referring now to Figure 13A, the reverse gear set 27 It continues to rotate but it is no longer possible to continue to rotate the missing tooth gear 125, but the pressure wheel 123 has been completely closed to press the roller 121.

Conversely, when the first swing arm 22 swings to the second position (as shown in FIG. 4A); the first roller set 23 will engage and connect the missing tooth gear 125 and rotate clockwise, and the missing gear 125 will drive The cam 124 rotates 270 degrees together and pushes the pressure wheel to open and close the swing arm 122 to separate the pressure wheel 123 from the roller 121 until the missing tooth gear 125 is turned to the missing tooth position 128. Referring again to Figure 13B, the first roller set 23 continues to rotate but the idling gear 125 is no longer able to continue, but the pressure wheel 123 has completely left the roller 121.

A resistance spring 126 is coaxially disposed on the missing gear 125. The resistance spring 126 applies a resistance to the missing gear 125 to ensure that the missing tooth gear 125 is stopped when it is turned to the missing tooth portion 127, and does not turn over because the rotational speed is too fast.

The operation flow of the single-sided scanning by the transmission device 20 and the automatic paper feeder of the present invention is as follows:

Referring now to Figure 8A, the manuscript is placed in the tray 14 when the automatic document feeder begins to operate. The drive motor 19 rotates in the clockwise direction and rotates the first and second drive gears 211, 212 clockwise, moving the first swing arm 22 to the first position and transmitting the transmission torque to the pickup device 10. At this time, the paper picking device 10 will be pressed toward the paper feed cassette 14, and the document is fed into the paper feed path 13. At this time, although the document continued by the paper picking device 10 is fed into the paper feed path 13, the speed of the paper feed roller 11 is faster than that of the paper picking device 10. Therefore, there is a difference in distance and speed between the documents fed into the paper feed path 13 and the late feed path 13 without overlapping. Further, the paper take-up device 10, the paper feed roller 11, and the paper discharge device 12 are all rotated in the same direction, so that the document will sequentially pass through the paper feed path 13, the scanning area 17, and the paper discharge path 15, and finally enter the paper discharge tray 16.

The process of double-sided scanning of a manuscript is as follows:

Referring now to Figure 8A, the manuscript is placed in the tray 14 when the automatic document feeder begins to operate. The drive motor 19 rotates in the clockwise direction and rotates the first and second drive gears 211, 212 clockwise, moving the first swing arm 22 to the first position and transmitting the transmission torque to the pickup device 10. At this time, the paper picking device 10 will be pressed toward the paper feed cassette 14, and the document is fed into the paper feed path 13.

Referring again to Fig. 8B, in order to prevent the document from entering the paper discharge tray 16 through the paper discharge device 12, when the document enters between the paper feed roller 11 and the scanning area 17, the drive motor 19 is rotated in the counterclockwise direction. Then, the first and second drive gears 211, 212 are rotated in the counterclockwise direction by the drive motor 19 to swing the first swing arm 22 to the second position, and the second swing arm 25 swings to the third position. At this time, the paper feed roller 11 maintains the same rotation direction by the action of the one-way gear set 30, but the paper discharge device 12 rotates the paper in the upstream direction to avoid feeding the document to the paper discharge tray 16, Moreover, the paper taking device 10 is also lifted up by the second roller set 26 to avoid contact with the manuscript.

Next, the scanned document is turned over. In order to turn the document over, the trailing end of the document needs to be completely separated from the scanning area 17, and then the document is fed back into the turning channel 18. Referring to FIGS. 9A and 9B, in order to leave the trailing end of the document away from the scanning area 17, the leading end of the document must first pass through the paper discharge device 12, but the paper discharge device 12 and the paper feed roller 11 are rotated due to the reverse rotation of the drive motor 19. The direction in which the document is conveyed is exactly the opposite, so that after the document reaches the paper discharge device 12, it will be damaged by the force in both directions. In order to avoid damage to the document, the first roller set 23 will contact the missing gear of the paper discharge device 12 after the first swing arm 22 makes a turn around the second drive gear 212, and drive the pressure wheel of the paper discharge device 12 The rollers are separated. Therefore, the scanned document can be smoothly passed through the paper exit path 15 and the paper discharge device 12 without being hindered by the paper discharge device 12. Referring again to FIGS. 10A and 10B, when the document completes the scanning of the first side and the end of the document has completely left the scanning area 17, the drive motor 19 is rotated in the clockwise direction. At this time, the first and second driving gears 211, 212 are rotated in the clockwise direction, the second swing arm 25 is moved toward the fourth position, and the second roller set 26 is brought into contact with the missing gear 125, and the pressure wheel of the paper discharge device 12 123 is returned to the position in contact with the roller 121 by the second roller set 26. At this time, the roller 121 of the paper discharge device 12 and the paper feed roller 11 are both rotated in the direction in which the document is conveyed to the paper discharge tray 16 until the document member completely enters the paper discharge path 15.

On the other hand, the first swing arm 22 also moves to the first position. During the entry of the document into the paper exit path 15, although the first swing arm 22 is moved toward the first position, the paper take-up device 10 is not touched. When the document has completely entered the paper exit path 15, the drive motor 19 will be rotated in the counterclockwise direction to reverse the roller 121 and pull the document located in the paper exit path 15 back to the flip path 18. The first swing arm 22 is now moved toward the second position. When the document pulled back by the paper discharge device 12 passes through the turning passage 18, the first roller set 23 of the first swing arm 22 is meshed with the missing tooth gear 125.

When the document pulled back by the paper discharge device 12 passes through the turning passage 18, the turning is completed, at which time the pressure roller 123 has completely left the roller 121 and remains open. At the same time, the manuscript will re-enter the scanning area 17 for the second side scanning. At this time, the first swing arm 22 is not in contact with the paper take-up device 10, so the paper take-up device 10 does not start feeding.

After the double-sided scanning is completed, the steps shown in the above 10A to 10B may be repeated, and the document is again pulled back to the turning channel 18 for the second turning rotation, and the manuscript is turned back to the front.

Referring to Fig. 11, after the second flipping causes the document to return to the front side, the drive motor 19 continues to rotate in the clockwise direction to discharge the document to the paper discharge tray 16; the pickup device 10 simultaneously presses down the document to continue feeding the document. . And return to the stage shown in Figure 8A to restart the paper feed.

In summary, the transmission device of the present invention is characterized in that a plurality of swing arms and missing gears are provided, and the transmission torque is alternately conveyed to the paper take-up device by using the interactive swing generated by different swing arms when the driving gears rotate in different directions. The paper discharge device and the paper feed roller, and the output time of the transmission torque is controlled by the time difference between the swing arms swinging back and forth. And the use of the edentulous gear to the no-toothed portion will not rotate, to do the action of the pressure wheel switch. Therefore, it is only necessary to use one motor and it is not necessary to install an additional controller, which can effectively reduce the volume of the automatic paper feeder and the production cost.

10. . . Paper take-up device

11. . . Paper feed roller

12. . . Paper exit device

19. . . Drive motor

20. . . transmission

30. . . One-way gear set

Claims (9)

An automatic paper feeder transmission device is disposed between the paper take-up device, the paper feed roller and the paper discharge device to transmit the driving torque of the drive motor, which comprises:
a drive gear set disposed between the paper take-up device and the paper discharge device and driven by the drive motor;
a first swing arm is driven by the drive gear set and connected with a first roller set that moves with the first swing arm; the first swing arm swings in a first position or a according to a different direction of rotation of the drive gear set a second position, the first roller set is brought into contact with the paper take-up device and the transmission torque is transmitted to the paper take-up device, or the first roller set is brought into contact with the paper discharge device and the transmission torque is transmitted to the paper discharge device;
a second swing arm is driven by the driving gear set and connected with a second roller set that moves with the second swing arm; the second swing arm swings in a third position or according to a different rotation direction of the driving gear set a fourth position, the second roller set is brought into contact with the paper take-up device and the transmission torque is transmitted to the paper take-up device, or the second roller set is brought into contact with the paper discharge device and the transmission torque is transmitted to the paper discharge device;
a one-way gear set, driven by the drive gear set, and transmitting the same direction of transmission torque to the paper feed roller regardless of whether the drive gear set rotates in any direction;
Wherein, 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 to the third position. The transmission device of the automatic document feeder of claim 1, wherein the driving gear set comprises a first driving gear driven by the driving motor, a reverse gear set meshing with the first driving gear, and a counter a second drive gear meshing with the gear set; wherein the first swing arm and the first roller set are coupled to the first drive gear and driven by the first drive gear, and the second swing arm and the second roller set are coupled to the second drive gear and Driven by the second drive gear. The transmission device of the automatic document feeder of claim 1, wherein the first roller set includes at least a first actuating gear and a torque limiter, the first actuating gear meshes with the first drive gear and The first swing arm is pivotally connected via the torque limiter; the second roller set includes at least a second actuating gear and a torque limiter, and the second actuating gear meshes with the second drive gear and is limited by torque The device is pivotally connected to the second swing arm. The transmission device of the automatic document feeder of claim 3, wherein the second swing arm has a first free end and a second free end, and the second roller set includes a second actuating gear and a reverse gear set; wherein the second actuating gear meshes with the second drive gear and is pivotally connected to the first free end, and the reverse gear set meshes with the second drive gear and is pivotally connected to the second free end, then When the second swing arm is in the third position, the second actuating gear meshes with the paper take-up device to transmit the transmission torque to the paper take-up device; when the second swing arm is in the fourth position, the reverse gear set meshes with the paper discharge device To transmit the transmission torque to the paper exit device. The transmission device of the automatic document feeder of claim 4, wherein the torque limiter is a compression spring and has its two ends abut against the actuating gear and the swing arm respectively to generate a rotation of the actuating gear. Friction. The transmission device of the automatic document feeder according to claim 1, wherein the one-way gear set includes a third driving gear, and the third swing arm pivotally connected to the third driving gear is pivotally connected to the third swing arm. a third actuating gear and a fourth actuating gear, an output wheel coupled to the paper feed roller, and a second reverse gear set coupled to the output wheel; wherein the third swing arm is pivotally coupled to the third drive gear Having two free ends, the third actuating gear and the fourth actuating gear are both meshed with the third drive gear and respectively pivotally connected to the two free ends of the third swing arm via a torque limiter; the third swing arm is The three driving gears rotate in a different direction and swing in a fifth position or a sixth position, so that the third actuating gear contacts the output wheel and transmits the transmission torque to the paper feeding roller, or the fourth actuating gear and the second The reverse gear set contacts and transmits the transmission torque to the paper feed roller, thereby ensuring that the transmission torque delivered to the finger roller always maintains the same direction. The transmission device of the automatic document feeder according to claim 6, wherein the torque limiter is a compression spring, and both ends of the compression spring abut against the actuating gear and the swing arm, respectively. The transmission device of the automatic document feeder according to claim 1, wherein the paper discharge device comprises a roller, the pressure wheel is disposed opposite to the roller, and the swing arm is disposed on a side of the pressure wheel opening and closing arm a cam, a missing tooth gear coaxially disposed with the cam, and a pressure wheel controlled by the pressure wheel opening and closing swing arm; when the first swing arm swings to the second position, the first roller set meshes with the missing tooth gear and drives out When the second swing arm is swung to the fourth position, the second roller set is engaged with the missing gear and drives the paper discharge device; and when the missing gear rotates, the cam coaxially disposed with the missing gear is synchronously driven Rotating, and then applying force to swing the pressure wheel opening and closing arm, the toothless gear is provided with a missing tooth portion, so when the first roller group and the second roller group drive the missing gear to rotate, the tooth will stop at the missing tooth The location of the part. The transmission device of the automatic paper feeder according to claim 8, wherein the toothless gear is coaxially provided with a resistance spring, and the resistance spring applies resistance to the missing gear to ensure that the missing gear is turned to the missing tooth portion. stop.