JPS63218445A - Sheet feeding device - Google Patents

Abstract

PURPOSE:To prevent the duplicated feeding of the copying paper to a resist roller by providing a rotating direction restricting means blocking the third shaft from rotating in the opposite direction to the rotation of a sheet feeding roller on a middle gear. CONSTITUTION:A one-way clutch blocking the third shaft 11 from rotating in the opposite direction to the rotation of a sheet feeding roller 5 is fitted on a middle gear 7. Therefore, if the copying paper is fed to a resist roller and the transmission of the driving force to a sheet feeding device B is cut off and the feeding of the copying paper to a transfer section is started by the resist roller, the rotation in the driven direction of the third shaft 11 supporting a handling roller 13 is blocked, and the resistance can be applied to the rotation in the driven direction of the handling roller 13 by the copying paper. Accordingly, the duplicated feeding of the copying paper to the resist roller can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a roller that is installed in parallel with a registration roller that feeds paper to a transfer section near the surface of a photoreceptor drum of a copying machine, and for feeding copy paper to this registration roller. The present invention relates to a paper feeding device.

PRIOR ART Conventionally, as the above-mentioned paper feeding device, for example, A shown in FIG.
It has been known.

As shown in the figure, the paper feeding device A includes a paper feeding roller 5 attached to a first shaft (paper feeding roller shaft) 4 connected to a drive source (not shown) via a clutch 3; 1 axis 4
is connected to the clutch 3 on the side opposite to the drive source via a second gear (intermediate gear') 7, and is rotationally driven in the same direction (arrow 17) as the first shaft 4, which is rotationally driven in the direction of arrow 15. The paper feed roller 5 has a third shaft (shaft) 11 to which the sheet is held, and a sorting roller 13 is disposed on the third shaft 11 via a torque limiter 12, and is held between the paper feed roller 5 and the sorting roller 13. After the leading end of the fed copy paper 20 (see FIG. 5 fat) is fed to the registration rollers 21 and 22, the clutch 3 is turned off and the registration rollers 21 and 22
The sheet feed roller 5 and the sorting roller 13 are configured to rotate as a result of the copy sheet 20 moving in the feeding direction (arrow 14) with the rotation of the copy sheet 20 .

The paper feed roller 5 is connected to the output side rotating body 3. of the clutch 3. It is attached to a first shaft 4 connected to the first shaft 4 via a one-way clutch (not shown) so that it can rotate only in the direction of arrow 15 with respect to the first shaft 4.

The third gear 10 of the third shaft 11 that supports the sorting roller 13 via the torque limiter 12 is connected to the first gear 6 fixed to the first shaft 4 and inside the copying machine main body (not shown). It is connected to the side plate 9 of the main body via a second gear 7 which is rotatably supported by a second shaft 8.

The torque setting value of the torque limiter 12 is determined by the friction torque generated on the separating roller 13 when the outer circumferential surface of the rotatably driven paper feed roller 5 and the outer circumferential surface of the sorting roller 13 come into contact with each other, and the friction torque generated between the paper feeding roller 5 and the sorting roller. A sheet of copy paper 20 is held between the paper feed roller 5 and the separation roller 13, which is smaller than the friction torque generated on the separation roller 13 when the paper feed roller 5 is rotationally driven. The friction torque is set to be larger than the friction torque generated on the sorting roller 13 when the paper feed roller 5 is rotationally driven.

Therefore, in the paper feeder A, FIG. 4 fa),
(As shown in bl, tc+, registration rollers 21, 2
2 (see FIG. 5 fa))). On the outer circumferential surface of the paper feed roller 5, which is rotated in the direction of arrow 15,
When the outer peripheral surface of the sorting roller 13 is in direct contact with the paper, the sorting roller 13 is driven in the direction of the arrow 18 as the paper feed roller 5 rotates (see tar in FIG. 4).

Furthermore, when a sheet of copy paper 20 is held between the rotatably driven paper feed roller 5 and the separating roller 13, the separating roller 13 is driven in the direction of the arrow 18 in the same way as described above (see FIG. 4). (see bl).

On the other hand, when a plurality of copy sheets 20 are held between the paper feed roller 5 and the separation roller 13, which are rotationally driven, the separation roller 13 is rotated by the third shaft 11, which is rotationally driven in the direction of the arrow 17. , is rotationally driven in the direction of arrow 17, which is the same direction as this third shaft 11 (see FIG. 4 +c+).

Therefore, in this case, the first sheet of copy paper 20 at the top that directly contacts the paper feed roller 5 is fed in the direction of arrow 14 as the paper feed roller 5 rotates, but it also directly contacts the separating roller 13. The rotation of the sorting roller 13 prevents the second and subsequent sheets of copy paper 20 that come into contact with each other from being fed in the direction of arrow 14 . As a result, the plurality of copy sheets 20 are separated and only one copy sheet 20 is fed to the registration rollers 21, 22.

As shown in FIG. 5 (al), when the leading edge of the copy paper 20 is fed to the registration rollers 21 and 22, a part of the copy paper 20 is still attached to the paper feed roller 5 and the separation roller 1.
3, the clutch 3 is turned off and the copy paper 20 moved by the registration rollers 21 and 22 rotates the paper feed roller 5 and the separating roller 13, thereby removing the copy paper 20. The paper is fed to a transfer section near the surface of a photosensitive drum (not shown) in synchronization with the rotational speed of the registration rollers 21 and 22.

Problems with the Prior Art However, in the paper feeder A, when the leading end of the copy paper 20 is fed to the registration rollers 21 and 22 as described above, the driving force is transmitted to the paper feeder A by the clutch 3. When the copy paper 20 is turned off, the copy paper 20 is cut off by the moving copy paper 20, and the paper feed roller 5 and the separation roller 13 are also cut off.
Driven rotation in the feeding direction (arrow 18, see Figure 5 (al))
2, which is in contact with the outer circumferential surface of the sorting roller 13.
There is a problem in that the subsequent copy sheets 20 are consecutively fed to the registration rollers 21 and 22 in succession with the first copy sheet 20 (see FIG. 5 fb)).

Purpose of the Invention The present invention was devised in view of the above-mentioned circumstances, and the copy paper is fed to the registration roller, the transmission of driving force to the paper feeding device is cut off, and the copy paper is fed to the transfer unit by the registration roller. When the feeding of copy paper starts, the shaft supporting the separating roller is prevented from rotating in the driven direction, and the copy paper is prevented from rotating in the driven direction of the separating roller. It is an object of the present invention to provide a paper feeding device that can prevent double feeding to registration rollers.

Structure of the Invention In order to achieve the above object, the present application provides a paper feed roller attached to a paper feed roller shaft that is arranged in parallel with a registration roller and connected to a drive source via a clutch, and a paper feed roller that is attached to a paper feed roller shaft that is connected to a drive source via a clutch. The paper feeding roller has a shaft and a separating roller which is connected via an intermediate gear on the side opposite to the drive source of the clutch and is disposed via a torque limiter on a shaft which is rotationally driven in the same direction as the paper feeding roller shaft. After the leading edge of the copy paper that is being fed between the rollers and the sorting roller is fed to the registration roller, the clutch is turned off, and the paper feed roller is driven by the copy paper that is moved by the rotation of this registration roller. A rotating paper feeding device, wherein the intermediate gear is provided with a rotation direction regulating means for preventing the shaft from rotating in a direction opposite to the paper feeding roller.
Furthermore, the paper feed roller and the separation roller are supported so as to be able to come into pressure contact with each other and be separated from each other, so that when the clutch is turned on and the paper feed roller and the separation roller are driven, the paper feed roller and the separation roller are moved relative to each other. A paper feeding device is provided which is configured to be able to come into pressure contact with the paper feeder.

Effect In the paper feeding device having the above configuration, the rotation direction regulating means prevents the shaft supporting the sorting roller from rotating in the opposite direction to the paper feeding roller (copy paper feeding direction). The sorting roller does not rotate in the copy paper feeding direction unless a torque greater than the torque setting value of the torque limiter is applied. Further, the paper feed roller and the separation roller are supported so as to be able to be brought into pressure contact with each other and separated from each other, so that when the clutch is turned on and the paper feed roller and the separation roller are driven, the paper feed roller and the separation roller are moved relative to each other. By configuring the rollers so that they can come into pressure contact with each other, it is possible to weaken the force of clamping the copy paper between the paper feeding roller and the sorting roller when the copy paper is not being fed. As a result, the frictional torque generated by the contact between the copying paper, which is moved by the rotation of the registration roller, and the separating roller can be suppressed to a value considerably smaller than the torque setting value of the torque limiter.

EXAMPLES Hereinafter, examples embodying the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.

The following examples are examples embodying the present invention, and are not intended to limit the technical scope of the present invention.

Here, FIG. 1 is a perspective view of essential parts of a paper feeding device according to an embodiment of the present invention, and FIG. A front view showing the arrangement of gears in the same figure (bl is a developed side view taken in the direction of arrow C with a partial cross section taken in the same figure fat).

Further, the paper feeding device B according to this embodiment, which will be described using the same reference numerals for the same elements as the conventional paper feeding device A shown in FIG. The basic structure is almost the same as that of paper feeding device A.

In the paper feeding device B, the fans in FIGS. 1 and 2, (b
As shown in FIG. 1, the second gear (intermediate gear) 7 has a third gear.
The axis (axis) 11 is the rotation direction of the paper feed roller 5 (arrow 15)
One-way clutch (rotation direction regulating means) 24 (Fig. 2) for preventing rotation in the opposite direction (arrow 23)
+Reference) is installed.

The one-way clutch 24 is as shown in FIG.
It is installed between the outer circumferential surface of the second shaft 8 fixed to the side plate 9 and the inner circumferential surface of the second gear 7, and the second gear 7 is mounted in the direction of the arrow 29 with respect to the second shaft 8. Rotation is allowed and rotation in the direction of arrow 30 is prevented (see FIGS. 1 and 2 (al.
reference).

Therefore, in the paper feeding device B having the above configuration, when feeding the copy paper 20 to the registration rollers 21 and 22,
Similar to the conventional feeding device A (see Fig. 4 (bl, (C1) and Fig. 5 (a), ■), the action of the rotatably driven sheet feeding roller 5 and the drivenly rotating sorting roller 13, Copy sheets 20 are reliably fed one by one to registration rollers 21 and 22.

On the other hand, the copy paper 20 is fed to the registration rollers 21 and 22, and the transmission of the driving force to the paper feeding device B is cut off by the clutch 3 being turned off.
When the feeding of the copy paper 20 to a transfer section (not shown) is started (see FIG. 5 (at)), the rotation of the third shaft 11 supporting the sorting roller 13 in the driven direction (arrow 23, 1st
(see figure) is prevented by the one-way clutch 24, so that the sorting roller 13 can easily rotate in the driven direction (arrow 18, see FIG. 5 (al)) as the copy paper 20 moves. There isn't.

Note that when a torque larger than the torque setting value of the torque limiter 12 is applied to the separating roller 13, the separating roller 13 rotates as a result of the copy paper 20, but the paper feed roller 5 and the separating roller 13 As described above, the value of the frictional torque generated on the separating roller 13 when a plurality of copy sheets 20 are sandwiched between the
Since the torque is smaller than the torque setting value, the copy paper 20 is not driven to rotate as the copy paper 20 moves (therefore, the second copy paper 20 and subsequent copies are not fed to the registration rollers 21 and 22.

Therefore, in the paper feeding device B, the registration roller 2
When the copy paper 20 is fed at 1.22 and the transmission of the driving force to the paper feeding device B is cut off, the registration rollers 21 and 22 start feeding the copy paper 20 to the photosensitive drum. Also, double feeding of the copy paper 20 to the registration rollers 21 and 22 is prevented.

Furthermore, as shown in FIG. 1, the third shaft 11 is supported by a bracket 27 which is swingably supported by the side plate 9 with a fourth shaft 28, so that the sorting roller 13 is aligned parallel to the paper feed roller 5. And can swing in the directions of arrows 25 and 26 (can be pressed and separated)
The copy paper 2 is further supported on the registration rollers 21 and 22.
0, the second gear 7 is connected to the clutch 3 so that the sorting roller 13 can move in the direction in which the sorting roller 13 comes into pressure contact with the paper feed roller 5 (the sorting roller 13 swings in the direction of the arrow 25).
When the feed roller 5 and the sorting roller 13 are driven by turning on, the third gear 10 fixed to the third shaft 11 is placed in a position where it can engage the second gear 7. By doing so (as shown in FIG. 1), the clamping force between the paper feed roller 5 and the sorting roller 13 when the copy paper 20 is fed can be further strengthened.

Therefore, with the above configuration, when the clutch 3 is turned off and the transmission of driving force to the paper feed roller 5 and the separation roller 13 is cut off, the clamping force on the copy paper 20 by the paper feed roller 5 and the separation roller 13 is reduced. , it can be scratched to make it smaller.

As a result, the copy paper 20 is fed to the registration rollers 2122, the transmission of driving force to the paper feeding device B is cut off, and the registration rollers 21 and 22 start feeding the copy paper 20 to the transfer section. In this case, the frictional torque generated on the separating roller 13 can be suppressed to an extremely small value, and the effect of separating the copy sheets 20 by the separating roller 13 can be made even more effective.

In the above embodiment, a case has been described in which the sorting roller 13 is movably supported with respect to the paper feed roller 5, but it is also possible to configure the paper feed roller 5 to be movable with respect to the paper feed roller 13. It is.

Furthermore, a mechanism that presses the separating roller 13 against the paper feeding roller 5 forces the separating roller 13 into contact with the paper feeding roller 5.
It is also possible to use a fluid cylinder for applying pressure.

Effects of the Invention As described above, the present invention provides a paper feed roller attached to a paper feed roller shaft that is arranged in parallel with the registration roller and connected to a drive source via a clutch, and the paper feed roller shaft and the clutch. a separating roller connected via an intermediate gear on the side opposite to the drive source and disposed via a torque limiter on a shaft that is rotationally driven in the same direction as the paper feeding roller shaft, the paper feeding roller and the separating roller After the leading edge of the copy paper is fed while being pinched by the resist rollers, the clutch is turned off, and the paper feed roller is rotated as a result of the copy paper being moved by the rotation of the registration rollers. In the paper feed device, the intermediate gear is provided with a rotation direction regulating means for preventing the shaft from rotating in a direction opposite to the paper feed roller. When the copy paper is fed and the transmission of driving force to the paper feeding device is cut off, and the registration roller starts feeding the copy paper to the transfer section, the shaft supporting the sorting roller moves in the driven direction. This can provide resistance to rotation of the copy paper in the driven direction of the sorting roller.

Therefore, it is possible to prevent duplicate feeding of copy sheets to the registration rollers.

Furthermore, the paper feed roller and the separation roller are supported so as to be able to come into pressure contact with each other and be separated from each other, so that when the clutch is turned on and the paper feed roller and the separation roller are driven, the paper feed roller and the separation roller are moved relative to each other. Since this paper feeding device is characterized in that it is configured to be able to come into pressure contact with the separating roller, the friction torque generated by the contact between the copy paper and the separating roller, which are moved by the rotation of the registration rollers, is reduced when the copy paper is not being fed. , the torque can be held to a much smaller value than the torque setting value of the torque limiter. Therefore, it is possible to make it more difficult for the copy paper to rotate the separating roller in the driven direction, and the effect of preventing double feeding is further enhanced.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of essential parts of a paper feeding device according to an embodiment of the present invention, and FIG. FIG. 3 is a front view showing the arrangement, FIG. , To), and (C) are respectively explanatory diagrams of the operation of the paper feeding device, and FIG. 5 is +a+, (b
) are explanatory diagrams of the operation when a copy sheet is fed to a registration roller by the conventional paper feeding device. (Explanation of symbols) 3... Clutch 4... First shaft (paper feed roller shaft) 5... Paper feed roller 6... First gear 7... Second gear (intermediate gear) ) 8...Second shaft 9...Side plate 10...Third gear 11...Third shaft (shaft) 12...Torque limiter 13...Sorting roller 20...Copy Paper 21.22... Registration roller 24... One-way clutch (rotation direction regulating means) 27.
...Bracket 28...Fourth shaft B...Paper feeding device.

Claims (1)

[Claims] 1. A paper feed roller attached to a paper feed roller shaft that is arranged in parallel with the registration roller and connected to a drive source via a clutch, and a counter drive source for the paper feed roller shaft and the clutch. A separating roller is provided via a torque limiter on a shaft connected to the side via an intermediate gear and driven to rotate in the same direction as the paper feeding roller shaft, and the paper feeding roller is sandwiched between the paper feeding roller and the separating roller. In the paper feeding device, the clutch is turned off after the leading edge of the copy paper fed by the registration roller is fed to the registration roller, and the paper feed roller is driven to rotate by the copy paper moved by the rotation of the registration roller. A paper feeding device characterized in that the intermediate gear is provided with a rotation direction regulating means for preventing the shaft from rotating in a direction opposite to that of the paper feeding roller. 2. A paper feed roller attached to a paper feed roller shaft that is arranged in parallel with the registration roller and connected to a drive source via a clutch, and an intermediate gear between this paper feed roller shaft and the side opposite to the drive source of the clutch. A copying machine is provided with a separating roller disposed via a torque limiter on a shaft connected to the feed roller shaft and rotationally driven in the same direction as the paper feed roller shaft, and the copy is fed while being sandwiched between the paper feed roller and the separation roller. In a paper feeding device in which the clutch is turned off after the leading edge of the paper is fed to the registration roller, and the paper feed roller is driven to rotate by the copy paper moved by the rotation of the registration roller, the shaft is connected to the intermediate gear. A rotation direction regulating means is provided to prevent the paper feed roller from rotating in a direction opposite to that of the paper feed roller, and the paper feed roller and the sorting roller are supported so as to be able to press against and separate from each other, and when the clutch is turned on, the paper feed roller is A paper feeding device characterized in that the paper feeding roller and the separating roller are configured so that the paper feeding roller and the separating roller can come into relative pressure contact with each other when the paper roller and the separating roller are being driven.