JPS62161679A - Sheet transfer device - Google Patents

Abstract

PURPOSE:To easily compensate the oblique motion of a sheet by driving not less than two transfer rollers provided in the direction perpendicular to the advance direction of a sheet by means of a one-way clutch and providing a stopper for making the sheet push against in a sheet transfer passage. CONSTITUTION:Plural transfer rollers 29, 29' are provided in the direction perpendicular to the transfer direction Y of a sheet S. Likewise pressing rollers 30, 30' corresponding to them are provided to nip the sheet S between them. Further the transfer rollers 29, 29' are driven by one-way clutch to prevent a reverse rotation. Stoppers 21, 21' are provided in a sheet transfer passage for making the sheet transferred push against. For example, when the sheet S pushes against the stopper 21 the transfer roller 29 gets idled but the transfer roller 29' transfers the sheet S to make contact with the stopper 21'. If the pressure of the pressing rollers 30, 30' is strenghened the sheet S generates buckling to fold itself S into two. Hereby the oblique motion of the sheet is easily compensated and its folding is executed.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to sheet conveying devices, particularly image forming devices such as copying machines, printing machines, and recording machines, and folding processing of sheets discharged from the image forming devices. The present invention relates to a sheet conveyance device suitable for use in a sheet folding device, and more particularly to a device for aligning the traveling direction of sheets in a sheet feeding section of these devices.

(B) Conventional technology Conventionally, in order to position the image leading edge of a sheet in the sheet feeding section of an image forming device and a folding device, that is, to align the sheet in the traveling direction, the sheet conveying path is A pair of register rollers are installed in a perpendicular direction, and the tips near both ends of the sheet member are brought into contact with the nip of the register rollers. After synchronization is achieved, the register rollers are operated, and the sheet member is moved in the direction of travel. were being harmonized.

←→ Problems to be Solved by the Invention However, the above-described apparatus requires a space for absorbing sheet loops in the sheet 1 conveyance path located downstream of the register rollers, or requires an electrical clutch. It was necessary to control the operation of the register roller by turning it on and off, which resulted in an increase in cost. Moreover, in order to correspond to the switching means having a high sheet conveyance speed, it is necessary to perform the response of the clutch with high precision.

(b) Means for Solving the Problems The present invention aims to solve the above-mentioned problems, and provides a stopper member for abutting the leading edge of a sheet against a sheet conveyance path, and this stopper member. A conveyance roller is provided for feeding the sheet up to the point where the sheet is conveyed, and the conveyance roller is a unidirectional roller provided at least two or more in a direction perpendicular to the sheet traveling direction and with a one-way clutch interposed therebetween. That is.

By adopting the above-mentioned means, when the leading edge of the sheet that is fed diagonally into the sheet conveyance path hits the brim, the unidirectional conveyance rollers provided at least two A difference occurs in the respective rotation rates, and the trailing sheet +4Q portion hits the stopper, thereby correcting the skew of the sheet.

(F) Embodiments Hereinafter, embodiments embodying the present invention will be described with reference to the drawings, taking as an example a folding device incorporating a skew correction device for a sheet 1 of the present invention.

As shown in FIG. 2, a sheet inlet 6 is provided at the top of the folding device body 5 in contact with the ejection roller 2.3 of the copying machine 1, and a pair of inlet rollers 7, 9 face the inlet 6. Further, on the downstream side of the pair of carry-in rollers 7°9, an entry lobe lifter 10 is disposed so as to be switchable in two directions, allowing the sheet S sent from the carry-in port 6 to pass through the conveyance path 1.
1 or to the folding tu feed path 12. Furthermore, a pair of discharge rollers 13 and 15 are disposed at the downstream end of the passing conveyance path 11, and a sheet discharge port 16 is provided downstream of the pair of discharge rollers 13 and 15. It is specified to be at the same horizontal level as the loading entrance 6. Further, a first folding roller 17 is disposed on the downstream side of the folding conveyance path 12, and a second folding roller 17 is arranged adjacent to the folding roller 17.
A folding roller 19 is arranged. Further, on the downstream side of the first folding roller 17, a first folding position regulating conveyance #
I20 is provided, and a fixed stopper member 21 is provided downstream of the first folding position regulating conveyance path 20. Further, a first stage folding roller pair 17 consisting of a first folding roller 17 and a second folding roller 19,
On the downstream side of the folding roller pair 19, the sheet S conveyed from the first stage folding roller pair 17.
The sheet is conveyed to a pair of folding rollers 19 and 23 at the second stage, which is a third folding roller 23 adjacent to the second stage. A fixed stopper member 25 is disposed on the downstream side of the second folding position regulating conveyance path 22. Further, a folding end conveyance path 26 is formed downstream of the pair of folding rollers 19 and 23 at the second stage, and the downstream side of the conveyance path 26 merges with the passing conveyance path 11 to form a pair of discharge rollers 13 and 15. It is communicated.

The folding path 12 is provided with a sensor 27 for detecting the passage of paper and a plurality of unidirectional conveyance rollers 29 and 29' driven by a drive system (not shown). Further, pressure rollers 30, 30' are placed in positions facing the unidirectional conveyance rollers 29, 29' across the sheet conveyance path.
, 29' are installed. These pressure rollers 30, 30' are folded as shown in FIGS. 2 and 3.
a support plate 32 fixed to a guide plate 31 for forming a feeding path;
The unidirectional conveyance roller 2 is rotatably supported by both side plates 32' and 32' of the support plate 32, and is supported by a tension spring 33.
It is supported by the main body of the apparatus via a rotating plate 35 to which a rotational force is applied to the 9, 29' sides, and plate springs 36 and 36 connecting this rotating plate 35 and the pressurizing rod 30p30'. The rotary plate 35 is configured such that a pressure solenoid 37 supported by the fixed plate 32 also applies rotational force to the unidirectional rollers 29 and 29'. Further, as shown in FIG. 1, two unidirectional conveyance rollers 29, 29'+ are provided at a predetermined interval apart, and are supported by a roller shaft 39 via a unidirectional clutch (not shown). has been done. Therefore, the unidirectional openings 29, 29' are connected to the roller shaft 39.
When rotating at a rotational speed higher than the rotational speed of the roller shaft 39, the clutch is not locked and can rotate freely, but in the normal case of transmitting rotation from the roller shaft 39, the clutch is locked and the roller shaft 39 is transmitted to the unidirectional rollers 29, 29'. Note that the feed roller pair of the unidirectional rollers 29, 29' and the pressure rollers 30, 30' will be simply referred to as the skew correction roller pair 29°30.
and 29', 30'.

Since this embodiment has the above configuration, copying + JI
The sheet S discharged from the sheet discharge port t1 is conveyed from the sheet inlet 6 of the folding device 5 to the inlet defrester 10 by rotation of a pair of rollers 7°9, and a through-pass mode in which the sheet S is not folded is selected. If
The entrance deflector 1o is switched to the passing conveyance path 11 side, and the sheet 1-S is conveyed to the passing conveyance path 11, and the sheet S is folded twice and conveyed to the sheet discharge port 16 by the rotation of the pair of discharge rollers 13 and 15. When the mode is selected, the input load defrester 1o is switched to the folding and conveying path 21 side, and the sheet S is sent to the folding and conveying path 12. The feed continues until the tip of S hits the stopper 21. At this time, the pressure roller 30, 30' is the tension spring 3
3, it is pressed against the unidirectional roller 29, 29' with a weak force (experimentally, one side is 35g, and the total conveying force is 70g)
Therefore, even after the tip of the sea j/s hits the stopper 21ζ, the skew correction roller pairs 29, 30 and 29', 3
0' continues to rotate, but as shown in Figure 1, the sheet S
The skew correction roller pairs 29, 30 and 29'
, 30' and fold conveyance #112. At this time, when the sheet s is conveyed diagonally and the leading edge of the sheet hits the stopper 21 on the right side of FIG. If the distance in the direction perpendicular to the traveling direction is 1, the unidirectional conveying roller 29 on the side where the sheet is in contact tries to further convey the sheet, so that a moment Wl acts on the sheet.

Due to this rotational moment, the sheet tries to move in the direction of correcting the skew (in the direction of arrow X in the figure), so the other unidirectional conveyance roller 29'
9' one-way clutch is unlocked and the seat is
The leading edge of the trailing sheet moves until it comes into contact with the stopper 21 without being hindered by the movement in the direction ζ, and the skew is corrected. In this way, the tip of the sheet hS a that has been corrected for skew hits the stopper 21, and after a certain period of time has elapsed, that is, after a certain period of time M has passed since the sensor 27 detected the tip of the sheet S, the pressure solenoid 37 is activated. Attraction and pressure rollers 3o, 30'
through the leaf springs 36, 36' to the directional roller 29.2
9' should be pressed with a strong force (experimentally (300~300 on one side)
5ooog1 total 600~1ooog tl feeding force). As a result, the seat S, which had been staying in place without bending down until now, now only sits in the 1/4th part from the tip, and the loop space is reduced to 40.
A loop is formed within. Note that in order to prevent loops from being formed when a weak sheet s is transported with a weak transport force, a loop-suppressing mylar seam 41 may be provided on the transport guide plate 31.

Furthermore, when the sheet S is conveyed with a strong conveyance force, the loop amount of the sheet S cannot be absorbed within the loop space of 4 degrees, and the loop is caught between the pair of folding rollers 17 and 19, and the first fold is folded. It is formed. Further, the sheet S on which the first fold has been formed is conveyed to the second folding position regulating conveyance path 22, and when the leading edge of the sheet abuts the fixed stopper 25 and a loop is formed, the second folding roller pair 19 , 23, the second fold of the Z-fold is formed, the second fold of the two-fold is formed, the two-fold is completed, and the folding end conveyance path 2 is formed.
6 and is then discharged by a pair of discharge rollers 13 and 15.

In addition, in this embodiment, the sheet 1-
Although we have described an example in which the skew correction device is applied to the folding device 5 of an S, the present skew correction device is not limited to this, and it goes without saying that it can be applied to skew correction in all types of devices having sheet conveyance mechanisms. Nor.

(G) As described in detail, according to the present invention, a plurality of unidirectional conveyance rollers are used as the stopper for abutting the leading end of the sheet member and the conveyance roller for conveying the sheet to this stopper. Therefore, it is possible to provide an inexpensive sheet skew correction device that does not require the use of a high-precision control device or the installation of extra members.

[Brief explanation of drawings]

FIG. 1 (a+ is a diagram showing the sheet skew correction mechanism in the 1yR feeding path as seen from the direction of arrow B in FIG. 2, and FIG. 1 (bl is a side view thereof. 3 is a sectional view of a sheet folding device to which the present invention is applied, and FIG. 3 is a front view of a pressure roller seen from the direction of arrow A in FIG. 1. 5. Folding device, 2. Folding ta feed path, 2゜25-stopper, 29.29'・unidirectional cola
, 30.30' Pressure roller.

Claims (3)

[Claims] (1) In a sheet conveyance device equipped with a stopper member for abutting the leading edge of the sheet against the sheet conveyance path, and a conveyance roller for feeding the sheet to this stopper member, the conveyance roller is perpendicular to the sheet traveling direction. A sheet conveying device characterized in that the sheet conveying device comprises at least two unidirectional rollers provided in one direction and driven via a one-way clutch. (2) The sheet conveyance device includes a pair of folding rollers that clamps a curved portion in the middle of the sheet, which is caused when the forcibly conveyed sheet hits the stopper member, in a conveyance path intermediate between the conveyance roller and the stopper member. 2. A sheet conveying device according to claim 1, which is a sheet conveying device in a sheet folding device which is provided with a pair of sheet folding rollers for performing folding processing. (3) Sheet conveyance according to claim 2, wherein the conveyance force of the conveyance roller is variable in two or more stages, and the skew correction of the sheet is performed when the conveyance force is weak, and the sheet is folded when the conveyance force is strong. Device.