JPS60114874A - Copy paper carrying device of copying machine - Google Patents

Abstract

PURPOSE:To execute smoothly double face copying during the work by giving bend to the reverse side on the way of a course between the position, just after a copy paper passed through a fixing device is inverted and is carried while bending, and a circulating belt. CONSTITUTION:After fixing, the copy paper is brought into contact with a carrying direction switching plate 27 through feeding rolls 26 and 26' and is inverted and is led into a curl straightening device 29 while bending along a path of a surface of second degree downward in the vertical direction. When a driving roll 44 of the curl straightening device 29 is rotated, a curl straightening belt 45 is moved, and pressing rolls 42 and 43 are ratated, and the curled copy paper is led between a curl straightening roll 41 and the curl straightening belt 45 and is moved on the circumferential face of the curl straightening roll 41 and is pressed to the curl straightening belt 45 and is bent in the side opposite to the bend side in the path of the surface of second degree. As the result, curl is straightened, and the copy paper is so inverted that an image is transferred to the other face.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copy paper transport device for a copying machine, and more particularly to a copy paper transport device for a copy machine for copying both sides of a copy paper.

Conventionally, the copy paper used to copy materials such as manuscripts has only been copied on one side.
The need for double-sided copying has arisen in order to save copy paper, and because the amount of paper used is halved when copy paper is consumed, making it more efficient to store copy paper.

This double-sided copying is done by the complicated method of copying one side of the copy paper, artificially turning the copy paper upside down after it is ejected from the ejection port, and then loading it into the feed port and copying again. The drawback was that it was inefficient.

In order to eliminate these drawbacks, some large-scale copying machines have been developed that automatically flip the copy paper and make double-sided copying possible, or they require a complicated flipping mechanism and the equipment is also large. As a result, it was inconvenient that it could not be adapted to small desktop-type machines.

Therefore, in the present invention, one side of the main machine frame 1 is provided with a first paper feed force cell I/3 and a second paper feed cassette 4, and the other side of the main machine frame 1 is provided with a copy tray 5. In the process of conveying the copy paper A supplied from the first paper feed cassette 3 from one side of the main machine frame 1 to the other side, an image is copied on one side of the copy paper A, resulting in one-sided copying. When
5, the copy paper A is reversed and sent to the return belt 33.
In the copy paper conveyance device for a copying machine of the type in which paper is returned toward the second paper feed cassette 4 by
In the middle of the path between the return belt 33 and the position immediately after the copy paper A is conveyed while being curved along the quadratic curved path as it is reversed, By providing a copy paper conveyance device for a copy machine in which a curl correction device 29 is provided for giving the copy paper a curvature opposite to the curvature of the copy paper, double-sided copying can be performed with a simple structure and at low cost. The main object of the present invention is to provide a copy paper transport device for a copying machine that can transport copy paper smoothly and without any hindrance during double-sided copying work.

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 is a simplified cross-sectional view of the %4 aircraft in its inverted state.
FIG. 2 is a simplified cross-sectional view of a copying machine that copies the reversed side. In the figure, reference numeral 1 denotes a main machine frame, and a transparent plate 2 on which a document is placed horizontally is provided above the frame. A first paper feed cassette 3 for storing copy paper A is attached to the center shaft at the right end of the main machine frame 1 as shown in FIG. 1, and a second paper feed cassette 4 for copying the back side of the copy paper is provided below the first paper feed cassette 3, and the copy paper after copying is discharged onto a copy receptacle 5 provided at the left end in FIG.

Note that the paper feed cassettes installed in the main machine frame l in this way are not limited to two tiers of the first paper feed cassette 3 and the second paper feed cassette 4, which are installed vertically side by side; A large number of copy sheets of various sizes may be stored in multiple rows, such as three rows in the section direction.

A photosensitive drum 6 whose entire circumferential surface is coated with a photosensitive layer (not shown) is rotatably mounted approximately in the center of the main engine frame 1, and a photosensitive drum 6 is rotatably mounted on the entire circumferential surface of the photosensitive drum 6. The reflected light is projected onto the photosensitive layer via movable reflecting mirrors 7, 8, in-mirror lens 9, and reflecting mirror 10 to form an image of the document, forming an electrostatic image on the photosensitive layer. . A charging corona discharger 11 is provided around the photosensitive drum 6 to charge the photosensitive layer. The electrostatic latent image formed on the photosensitive layer is visualized to form a toner image.
A rubbing developing device 12, a transfer corona discharge device 13 for transferring the toner image formed on the photosensitive layer onto copy paper, and a cleaning device 14 for removing toner remaining on the photosensitive layer after transfer are arranged. has been done.

Reference numerals 18.18', 20.20', and 22.22' designate a pair of transport rollers for transporting the copy paper A that has been pushed up by the lever 16 and fed by the paper feed roller 15 for single-sided copying. . Further, 1 7 and 17' are guide plates provided between the paper feed roller ■5 and the conveyance roller 18°18'♂, and are 19.19'.

Reference numerals 21 and 21' designate a pair of guide plates, each of which is installed between the above-mentioned 4-R and guides the copy paper. Reference numeral 24 denotes a guide plate for conveying the copy paper transferred by the photosensitive drum 6 to the fixing device 25, and is stretched between the belt rollers 23 and 23'.

The first sheet that has been heat-fixed by the fixer 25 is fed out from the feed rollers 26, 26', and passes through the ejection rollers 49, 49' as shown by the phantom lines in FIG.
As shown in the imaginary line in Figure 1,
It is conveyed along the system path of the body 2 that branches from the first guide path in the vertical direction and heads toward the return belt 33 .

The copy paper is conveyed to either the first guide path or the second guide path branching from the first guide path using the feed direction switching plate 27, as shown in Fig. 1. As shown, the feed rollers 26, 26 are disposed in the main machine frame l.
' and discharge rollers 49, 49'. This conveyance direction switching plate 27 is pivoted by a pivot shaft 27a, and is rotated around the pivot shaft 27a in accordance with a command signal in FIG.
It is rotatable as shown in FIG. 2, and when it is rotated in the horizontal direction as shown in FIG.
The copy paper sent out from 6' passes over the conveyance direction switching plate 27, passes through discharge rollers 49 and 49', and reaches the copy tray 5.
Take the first guide route towards. The other conveyance direction switching plate 27
As shown in FIG. 1, when the oblique portion 27b rotates upward, that is, in the direction facing the feed rollers 26 and 26', the copy paper fed out from the feed rollers 26 and 26' moves in the conveying direction. The second guide path that comes into contact with the switching plate 27 and branches in the vertical direction is cut.

Below this conveyance direction switching plate 27 is a curling device 2.
9 is disposed, which draws in the single-sided copy paper that has been branched downward from the horizontal direction to the vertical direction by contacting the transport direction switching plate 27, and transfers it to the return paper located below the transport direction switching plate 27. The first sheet of paper is placed on the feed belt 33. At the same time, this curl correction device 29 is arranged such that, as the copy paper is reversed, it is curved along a quadratic curved path while being de-feeded, and immediately after it is once bent 45 degrees to the opposite side and sent onto the return belt 33. It plays the role of straightening curls.

This curl correction device will be described in more detail with reference to FIG. 3. The copy paper that has been transferred and fixed by the fixing device 25 is sent out in the horizontal direction by delivery rollers 26, 26'.
:"W contacts the curved oblique side 27b of the transport direction switching plate 27. When the copy paper comes into contact with this transport direction switching plate 27, the copy paper is reversed and the transport direction switching plate 27 is moved as shown in virtual BD A 1. The copy paper is drawn into the curl straightening device 29 in a state in which it is clearly curved along a quadratic curved path convex in the direction, and so-called curls have occurred.

This curl straightening device 29 has a curl straightening roller 41 (!
: Consisting of pressing rollers 42, 43 and a driving roller 44, the suppressing rollers 42 and 43 are curl rollers, and a positive roller 41.
45, and the pressing rows 42,
43 and the drive roller 44 is a curled belt 4.
5 is stretched, and this correction belt 45 is (+i pressure roller 4
2 and 43 are stretched over the circumferential surface of the curl correction roller 41, that is, the correction belt 45 is sandwiched between the correction roller 4 and the correction belt 45.
1 is in contact with pressing rollers 42 and 43, respectively. ,
As the drive roller 44 rotates, the curl correction belt 45 moves, and as the curl correction belt 45 moves, the pressure rollers 42 and 43 rotate, and the pressure roller 4 also rotates.
The curl correction roller 41, which is in contact with the rollers 2 and 43 via the correction belt 45, also rotates.

Then, the copy paper comes into contact with the conveyance direction switching plate 27 and is deflected vertically downward, and is curled along a quadratic curved path as shown by the virtual line A1.
1 and the curl correction belt l-45 (:1i, il j) are pulled in I'71, the copy set moving on the circumferential surface of the curl correction roller 41 is pressed by the curl correction belt 45, and the quadratic curved path is The opposite curvature is given, ie the curl is straightened, and it is fed onto the return belt 33 in a virtual %t,y A 2 condition.

As a result, the copy paper that is curled is on the way to the paper feeding route. 3 Paper jam caused by getting caught in the feed roller 1.:
It is possible to prevent trouble during the conveyance process, such as not being able to feed the copy paper four times, and the copy paper can be conveyed smoothly.

The curvature on the side opposite to the quadratic curved surface path of the copy paper can be corrected by using the curl correction belt 45, or the curvature on the side opposite to the quadratic curved surface path can be corrected by using only the curl straightening iF roller without using the belt. It can also be given to

As shown in FIG.
It is stretched between a belt roller 31 located at the left end of the separate frame 30 and a belt roller 32 located at its right end. Note that this return belt 33 is simply a bell H.
The present invention is not limited to this, and a roller conveyor may be used as long as the copy paper can be placed thereon and conveyed.

There is a return bell on the belt roller 32!・A belt roller 34 is disposed to sandwich the belt 1-roller 33, and a belt roller 35 is provided diagonally above the belt roller 34 to protrude from the main machine frame 1. An auxiliary belt 36 is sandwiched below the belt roller 35. Further, an auxiliary belt 1-36 is provided between the belt rollers 34 and 35, and an auxiliary belt 38 is provided between the belt roller 32 and the belt roller 37.
are stretched, and the cut sheets conveyed by the return belt 33 are held by the auxiliary belts 36 and 38 and fed to the guide plates 39 and 39'. Guidance '39,
39' is attached to the second paper feed cassette 4, and a pair of reversing rollers 40 and 40' are provided at one end thereof. These reversing rollers 40, 40' are connected to the guide plate 39°3.
It rotates (hereinafter referred to as reverse rotation) so as to feed the paper sheet guided by 9' into the second paper feed cassette 4,
It can rotate in a direction away from the second paper feed cassette 4 (hereinafter referred to as normal rotation).

To explain how to use the first copy paper conveyance unit for a slow copying machine with the above configuration, as shown in FIG. Copy paper A that has not been copied is stored therein, and the second paper feed cassette 4 is an empty cassette in which no copy paper is fully stored. In this state, the copy paper A, which has been pushed up by a lever 16 disposed on the main machine frame, is fed from the paper feed cassette 3 by a paper feed roller 15. This fed copy paper is
A pair of guide plates 17, 17', high speed rollers 18, 18
'Guide plates 19, 19', conveyance rollers 20, 20',
A pair of conveyance rollers 22 , via guide plates 21 , 21 ′
22', the image is transferred so as to be brought into close contact with the photosensitive layer of the photosensitive drum 6 facing the transfer corona discharger 13. After the transfer is completed, the copy paper is sent to the fixing device 25 by the guide plates 24 and 24' and is fixed thereon.

The fixed copy paper passes through the delivery ports 26 and 26' and comes into contact with the conveyance direction switching plate 27. As shown in FIG. 3, this conveyance direction switching plate 27 is rotated in advance by a command signal around the pivot 11iIb 27a in a direction in which the two halves, that is, the oblique sides 27b, face the feed rollers 26 and 26'. Therefore, the copy paper fed out horizontally from feedout 1 cola 26.26' is.

The curl correction device 29 is in contact with the conveyance direction switching plate 27, and as it is reversed, the virtual IJA1 is curved vertically downward along a quadratic curved path, that is, curls have occurred in the paper. be drawn into. And curl correction device 29
The rotation of the drive roller 44 causes the curl correction belt 45 to move, and the movement of the curl correction belt 45 causes the suppression rollers 42 and 43 to rotate. As the curl correction roller 41 that is in contact with the curl correction roller 41 also rotates, the curled copy paper is drawn between the curl pressure roller 41 and the curl correction belt 45, and the curl correction roller 41
moves on the circumferential surface of and is pressed by the curl correction bell 1.45,
A curvature opposite to the quadratic path is provided.

As a result, the curl is corrected, and the copy paper is fed and placed on the return belt 33 in the state of the imaginary line A2, and at this stage the copy paper is reversed so that the image is transferred to the other side. That is, one side on which the image has been transferred is in contact with the return belt 33, and the other side on which the image has not yet been copied is exposed. This return belt 33
The copy paper placed on top is transferred to the return belt 3 as shown in Figure 1.
3 is transported to the right by the movement of 3, and the auxiliary bell 1-36.3
8, is guided by guides 39, 39' attached to the second paper feed cassette 4, and guided to a pair of reversing rollers 40, 40'.

By the forward rotation of the pair of reversing rollers 40 and 40', the front end of the loincloth paper is projected from the reversing rollers 40 and 40', and at the stage where the rear end is still being held between the reversing rollers 40 and 40', The reversing rollers 40.degree. and 40' are reversely rotated by a command signal, and the copy paper is fed into the second paper feed cassette 4 with one side that has not yet been reversed facing up.

Next, in order to copy this one side that has not been copied yet, the conveying direction switching plate 27 is rotated about the pivot shaft 27a in parallel to the conveying direction of the copy paper in response to a command signal. That is, the second
Displace it to the position shown in the figure. Then, the copy paper that has been pushed upward by the lever 47 is transferred to the paper feed roller 4.
6, the paper is fed from the second paper feed cassette 4. The fed copy paper is guided by guide plates 48, 48' and led to conveyance rollers 20, 20', and then transferred through the above-mentioned path to be transferred to delivery rollers 26, 2G'.
, passes over the current feeding direction switching plate 27 and reaches the discharge roller 4.
9 and 49', it is fed into the copy tray 5 along the first guide path toward the copy tray 5. In this way, duplex copying of the copy paper is completed.

As detailed above, since the present invention has the above configuration, double-sided copying of copy paper, which was difficult in the past, is possible with a simple configuration, and as a result, copy paper can be saved and storage is also efficient. It became.

In addition, the copy paper after passing through the fixing device is reversed and curved along a quadratic curved path, and the curl correction is performed between the position immediately after being conveyed and the return belt. Since the device is installed, curls that occur in the copy paper can be corrected, and there are advantages such as smooth conveyance without the paper getting caught on the conveyance roller during general conveyance and causing paper jams that hinder conveyance.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which FIG. 1 is a simplified cross-sectional view of the copying machine in a reversed state, and FIG. 2 is a state in which the copying machine is reversed and the other side on which no image has been transferred is being copied. A simplified sectional view, FIG. 3 is an enlarged view of the main part of FIG. 1. 1...Main machine frame, 3...First paper feed cassette, 4...Second paper feed cassette, 25...Fuser unit, 30. ... Curl straightening device, 33... River/return belt, 41... Curl straightening roller. 45... Curl correction belt. Applicant Sanda Kogyo Co., Ltd. Agent Patent Attorney Junya Suzuki

Claims (1)

[Claims] On one side of the main machine frame 1 are a first paper feed cassette 3 and a second paper cassette 3.
A copy tray 5 is provided on the other side of the main machine frame 1, and the copy paper A supplied from the first paper feed cassette 3 is transferred from one side of the main machine frame 1 to the other side. An image is copied on one side of the copy paper A in the process of being conveyed to the copy paper A,
During double-sided copying, the copy paper A after passing through the fixing device 25
In a copy paper conveyance device for a copying machine in which the copy paper A is reversed and returned to the second paper feed cassette 4 by the return belt 33, the copy paper A after passing through the fixing device 25 is reversed. θQj +Il j
, a curl correction device 29 is disposed in the middle of the path between the position immediately after the copy paper is transported and the return belt 33 for giving the copy paper a curvature opposite to the curvature of the quadratic curved path. Copy paper conveyance device for the copier installed.