JPH041151Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to a paper feeder that separates and feeds stacked sheets one by one, such as a document feeder of a copying machine or a copy paper feeder.

[Conventional technology]

Conventionally, as shown in FIG. 7, a paper feeding device such as a document feeding device of a copying machine separates stacked sheets of paper A on a paper feeding table using a paper feeding means such as a paper feeding roller B and a separation roller C, which are in pressure contact with each other. The paper is separated and fed one by one using a means. A plurality of pairs of these paper feed rollers and separation rollers are provided at predetermined intervals so that even large-sized paper can be reliably separated and fed.

[Problem that the invention attempts to solve]

With such paper feeding devices, when feeding large size paper, it is necessary to use all pairs of rollers, so there is no problem, but when feeding small size paper, they are not used. Laura comes out. When paper is not interposed between a pair of rollers, the paper feed roller and separation roller are pressed against each other, rotate in opposite directions, and are prone to wear due to friction because their surfaces are made of rubber. It also makes a lot of noise due to friction. Furthermore, the load torque applied to the drive mechanism increases. Skew is also likely to occur due to uneven frictional resistance between a pair of rollers that are always used and a pair of rollers that are rarely used. In view of the above points, this invention has been developed to reduce the friction between the paper feeding means and the separation means, which do not involve paper, when feeding small-sized paper, reduce friction noise and wear, and reduce the load torque. An object of the present invention is to obtain a paper feeding device in which skew is less likely to occur.

[Means to solve the problem]

In other words, the paper feeding device of this invention separates stacked sheets of paper on a paper feed tray one by one using a plurality of paper feeding means and separating means, which are provided in the paper width direction and are in pressure contact with each other, and at least one of which is driven. In a paper feeding device that feeds the paper, transmission of driving force to the paper feeding means and/or separation means located outside the paper width depending on the size of the paper is achieved in a state in which the paper feeding means and the separating means are in pressure contact with each other. The invention is characterized in that it is equipped with a means for cutting.

【Example】

An embodiment of the paper feeding device of this invention will be described below with reference to the drawings. First, as shown in FIG. 1, a conveying means 2 is provided on a document setting surface 1 of a copying machine. This conveyance means 2 is constructed by, for example, an endless belt 5 stretched between pulleys 3 and 4 disposed at both left and right ends of the document setting surface 1. 6. At one end of this conveying means 2 is a supply table 7 for the original 6.
However, a reversing path 8 for the original 6 is connected to the other end. The supply table 7 for the original 6 includes an original stacker 9, a cutout roller 10, a presser plate 11, and a paper feed roller 1.
2, separation roller 13 and feed roller 14,
15, which separates the originals 6 on the original stacker 9 one by one and sends them to the conveyance means 2. The reversing path 8 includes a stopper 16, an entry/exit detection sensor 17, feed rollers 18, 19, a reversing member 21 that rotates around a shaft 20, a conveyance roller 22 attached to this reversing member 21, and a conveyor roller 22 that rotates around the shaft 20. A reversing roller 23, an auxiliary roller 24 facing the transport roller 22, an auxiliary roller 25 facing the reversing roller 23, a cage lever 27 rotating around a shaft 26, and a transport guide 2 rotating around a shaft 28.
9. An auxiliary roller 30 is attached to the conveyance guide 29 and faces the conveyance roller 22. Further, a storage stacker 31 is provided below the gate lever 27 to store the original 6 that has been copied. In the above configuration, the drive mechanism for the paper feed roller 12 and separation roller 13 is as shown in FIGS. 2 and 3. First, three paper feed rollers 12 and three separation rollers 13 are provided, and as shown in FIG.
They are distinguished as 3A, 13B, and 13C. Note that the paper feed rollers 12A to 12C are one-way rollers that allow rotation only in the paper feeding direction. Also, the paper feed rollers 12A and 12B are common for small size and large size paper, and the paper feed roller 12C
is a large size paper. The paper feed rollers 12A and 12B use the shaft 32 as a rotation axis. This shaft 32 has both ends attached to the bracket 3.
3 and 34, and a gear 35 is provided at the end of the bracket 34. This gear 35 has gear 3
6 are engaged. Further, a shaft 39 supported by brackets 37 and 38 is attached to the gear 36. A gear 40 is attached to the end of the shaft 39 on the side of the bracket 38, and this gear 40 is connected to a motor 42 via a transmission mechanism 41. On the other hand, a shaft 43 is attached to the paper feed roller 12C, and this shaft 43 is supported by brackets 44 and 45. An electromagnetic clutch 46 is connected to the shaft 43 so that the drive of the motor 42 is transmitted thereto. The electromagnetic clutch 46 is controlled so that it is turned on when feeding large size paper and turned off when feeding small size paper. The separation rollers 13A to 13C are supported on a shaft 53 via brackets 47 to 52 as shown in FIG.
3 rotational force is transmitted. Note that axis 5
3 is supported by brackets 57 and 58 as shown in FIG. 3, and is connected to the motor 42 via a transmission mechanism 59.

[Effect]

In such a configuration, the document 6 is conveyed by first feeding the document 6 on the document stacker 9 by the notched roller 10 and then by the paper feed roller 12 and the separation roller 13.
The pieces are separated one by one. The document 6 is then fed to the conveying means 2 via feed rollers 14 and 15, and conveyed on the document setting surface 1 until the document 6 contacts a stopper 16. Then, copying of the original 6 is performed, and when the copying is completed, the stopper 16 is rotated to release the stoppage of the original 6, and the original 6 is sent to the reversing path by the belt 5. The document 6 is placed between the feed rollers 18 and 19, between the transport roller 22 and the auxiliary roller 24, and between the transport roller 2
3 and the auxiliary roller 25, the gate lever 27, the conveyance guide 29, the conveyance roller 22 and the auxiliary roller 30.
The document is conveyed again onto the document setting surface 1 through the gap. Then, the document 6 is moved back and stopped by the stopper 16. Then, the back side of the original 6 is copied. When copying is completed, the document is reversed again on the reversing path 8 and conveyed to the document setting surface 1 again. As a result, the original 6 is placed in the same state as when it was placed on the original stacker 9. This document 6 is supplied to the reversing path 8 again and again. At this time, the gate lever 27 is rotated to the left, and the gate to the storage stacker 31 is opened. Therefore,
The document 6 that has entered the reversing path 8 is changed course from the auxiliary roller 25 to the storage stacker 31 side and is stored therein. This completes duplex copying of one sheet of original 6. Note that when the document 6 is jammed in the reversing path 8, the conveyance guide 29 and the reversing member 21 are moved to the shaft 2.
Rotate around 8 and 20 for processing. In the above description, the operations of the paper feed roller and separation roller are as follows. First, when it is detected that the size of the document 6 to be conveyed is small, for example, by the position of a paper regulating plate (not shown) that moves in the width direction of the paper and regulates the sides of the paper, the electromagnetic sensor shown in FIG. Clutch 46 remains off. In this state, the motor 42
When the is operated, the transmission mechanism 41, gear 40, shaft 3
9. Paper feed rollers 12A and 12B rotate in the paper feeding direction via gears 36 and 35 and shaft 32. At this time, since the electromagnetic clutch 46 is turned off, the driving force of the paper feed motor 42 is not transmitted to the shaft 43 that drives the paper feed roller 12C. Therefore, the paper feed roller 12 is not rotated by the driving force of the motor 42. On the other hand, the shaft 53 is operated by the rotation of the motor 42, and the separation rollers 13A to 13C are rotated in the separation direction, thereby performing a separation operation. At this time, since the electromagnetic clutch 46 is disengaged, the shaft 43 is in a free state. Therefore, in a state where the separation roller 13C and paper feed roller 12C are in pressure contact, the separation roller 13C
As the paper rotates, the paper feed roller 12C rotates. Next, when it is detected that the document 6 has been switched to a larger size document by the operation of the paper regulating plate, the electromagnetic clutch 46 is turned on, and the motor 42 is driven while the separation roller 13C and paper feed roller 12C are in pressure contact. The force is also transmitted to the paper feed roller 12C. As a result, all of the paper feed rollers 12A to 12C operate, and paper is fed and separated. According to the above embodiment, when the document 6 is a small size, the paper feed roller 12C is in pressure contact with the separating roller 13C and left free, and only when the document 6 is a large size, the paper feed roller 12C is driven by the motor 42. Therefore, when the document size is small, the feed roller 12C rotates with the rotational force of the separation roller 13C without intervening the document 6. Therefore, the paper feed roller 12C and the separation roller 13C do not rotate in a direction in which they repel each other as in the prior art, so noises caused by friction and wear of the rollers are reduced. In addition, the load torque becomes smaller, and the motor 42
Therefore, it can be made smaller. Furthermore, paper feed roller 1
Since a large deviating force no longer acts only between the separation roller 2C and the separation roller 13C, the fed document 6 is less likely to skew. Although one embodiment of this invention has been described above, this invention is not limited to the above embodiment. For example, the paper feeding device of this invention is applicable not only to a copy document feeding device but also to a copy paper feeding device, a paper feeding device of a printer, and the like. Furthermore, separate drive sources may be used for the paper feeding means common to large and small paper and the paper feeding means used only for large size paper. Alternatively, a driving method as shown in FIG. 4 may be used. In this example, 61 is a motor, 62A and 62B are gears, 63 is a clutch, 64A and 6
4B is a gear, 65A to 65C are paper feed rollers,
66 is a rotary shaft coupled to the motor 61, gear 62A, and paper feed rollers 65A, 65B; 67 is attached with gear 64A and paper feed roller 65C;
It is a shaft pipe that is rotatable about the rotating shaft 66. Further, in the embodiment, the sheet feeding means side is divided into two parts and driven, but the separating means side may be divided and driven. Furthermore, in the above embodiment, as shown in FIG. 5, the document 6 is set on one side, but it may be set on the center as shown in FIG. In this case, when the document 6 is small in size, the driving of the paper feeding means or separating means at both ends is stopped. The paper feeding means is not limited to a roller, but may be a belt or the like. Further, the separating means is not limited to a reversing roller, but may also be a belt, a non-rotating roller, a patch, or the like. In the above embodiment, the paper feed roller is divided into two types, large size and small size, and the drive of the feed roller is performed in two stages, but it may be further divided if there is a large difference between the minimum size and maximum size. .

[Effect of the idea]

As explained above, according to this invention, among the plurality of paper feeding means and separating means provided in the paper width direction and in pressure contact with each other, for separating and feeding the stacked paper sheets on the paper feeding table one by one, Since the transmission of the driving force to the paper feeding means and/or the separating means located outside the paper width is cut off depending on the size of the paper, the transmission of the driving force to the paper feeding means and/or separating means located outside the paper width is possible. The friction between the parts is reduced, friction noise and wear are reduced, and the load torque is also reduced.
Moreover, it is possible to obtain a paper feeding device in which skew is less likely to occur. Furthermore, since the transmission of the driving force to the paper feeding means and/or the separating means located outside the paper width is cut off while the paper feeding means and the separating means are in pressure contact with each other, opening and closing of the separating means can be performed easily. There is no need for a mechanism or space required to stop rotation.

[Brief explanation of the drawing]

1 to 6 are for explaining an embodiment of the paper feeding device of this invention, and FIG. 1 is a schematic diagram for explaining the general configuration of the paper feeding mechanism in the copy document feeding device; Figures 2 and 3 are plan and side views showing the drive mechanism for the paper feed roller and separation roller, Figure 4 is a schematic diagram showing another example of the drive system for the paper feed roller, and Figure 5 is a one-sided reference drive system. FIG. 6 is a schematic diagram showing a center-based paper feeding mechanism, and FIG. 7 is a schematic diagram showing a conventional drive mechanism for a paper feeding roller and separation roller. 6... Copy original, 12, 12A to 12C... Paper feed roller, 13, 13A to 13C... Separation roller, 42... Motor, 46... Electromagnetic clutch.

Claims (1)

[Scope of utility model registration request] In a paper feeding device that separates and feeds stacked sheets of paper on a paper feeding tray one by one using a plurality of paper feeding means and separating means provided in the width direction of the sheets and in pressure contact with each other and at least one of which is driven, the above-mentioned The present invention further includes a means for cutting off the transmission of driving force to the paper feeding means and/or the separating means located outside the paper width depending on the size of the paper while the paper feeding means and the separating means are in pressure contact with each other. Characteristic paper feeding device.