JPS60181757A - Copy paper conveying device for copying machine - Google Patents

Abstract

PURPOSE:To take a both-surface copy by setting previously the operation interval of a paper feeding mechanism for copy paper so that the interval is longer when conveyance direction control rollers reverse longer than when the control rollers rotate normally. CONSTITUTION:When the conveyance direction control rollers 29 and 29' rotate forward according to a command signal, copy paper A is sent in a circulating feed tool 35 and when the control rollers 29 and 29' reverse according to the command signal, the copy paper A is sent in a copy receiving tray 5 without being sent to the circulating feed tool 35. The operation interval of the paper feeding mechanism is set previously so that the paper feeding interval of the paper feeding mechanism which feeds the copying paper is set longer when the control rollers 29 and 29' reverse than when the rollers 29 and 29' rotate forward, and the copy paper conveying device which takes a both-surface copy and aligns the copy paper is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a copy paper conveyance device for a copying machine, and more particularly to a copy paper conveyance device for a copying machine that can copy both sides of a copy paper.

(Prior Art) Conventionally, copy paper used to copy objects such as manuscripts has been copied only on one side.
The necessity of double-sided copying has arisen in order to save copy paper, and because when a large amount of copy paper is consumed, the amount of paper used can be halved and copy paper can be stored more efficiently. In order to make double-sided copies, a complicated method is used in which one side of the copy paper is copied, the paper is ejected from the ejection port, the paper is then manually turned over, and the paper is placed in the feed port and copied again. It had the disadvantage of being efficient.

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, but this requires a complicated flipping mechanism and requires equipment. It also became larger, and as a result it could not be adapted to small desktop machines.

(Purpose and Structure of the Invention) The present invention was invented in view of the above-mentioned circumstances. Conveyance direction control rollers 29, 29' that guide copy paper A in a commanded direction based on a command signal;
29' and a return tool 35 for returning the copy paper A fed by the second paper feed cassette 4;
a reversing device 42, 42' that feeds the copy paper A fed through the paper feed cassette 4 into the second paper feed cassette 4 in an inverted state so that the image is transferred to the other side; and the paper feed cassette 3 . Copy paper conveying device for a copying machine in which the copy paper A is sent to the copy tray 5 without being sent to the return tool 35 when the conveyance direction control rollers 29, 29' reversely rotate according to the command signal. In this case, when the conveyance direction control rollers 29, 29' rotate in the reverse direction, the paper feeding interval of the paper feeding mechanism that feeds the copy paper becomes longer than when the conveyance direction control rollers 29, 29' rotate in the normal direction. Provided is a copy paper conveying device for a copying machine in which an operation interval of the paper feeding mechanism is set in advance,
The main object of the present invention is to provide a copy paper conveying device for a copying machine that is capable of double-sided copying and page alignment.

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

FIG. 1 is a sectional view showing a simplified state of the copying machine in an inverted state, and FIG. 2 is a sectional view of the copying machine that makes copies on the other side of the inverted state. 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. Copy paper A
The first paper feed cassette 3, which stores the copy paper A, is removably attached to the center shaft at the right end of the main machine frame 1, as shown in FIG. A paper cassette 4 is provided below the first paper feed cassette 3, and the copy paper after copying is discharged to a copy tray 5 provided at the left end in FIG. Note that the paper feed cassettes detachably attached to the main machine frame 1 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. Instead, a large number of copy sheets of various sizes may be stored in multiple tiers, such as three tiers, in the vertical direction.

A photosensitive drum 6 whose entire circumferential surface is coated with a photosensitive layer (not shown) is rotatably mounted approximately at the center of the main machine frame 1. The reflected light is projected onto the photosensitive layer via movable reflecting mirrors 7 and 8° in-mirror lens 92 and reflecting mirror 10 to form an image of the original,
An electrostatic image is formed on the photosensitive layer. Around the photosensitive drum 6, there is a charging corona discharger 11 that charges the photosensitive layer, a developing device 12 that visualizes the electrostatic latent image formed on the photosensitive layer and converts it into a toner image, and a toner image formed on the photosensitive layer. A transfer corona discharger 13 is provided to transfer the toner image onto copy paper, and a cleaning device 14 is provided to remove toner remaining on the photosensitive layer after transfer.

18 , 18', 20, 20', 22, 22'
, 23.

Reference numeral 23' designates a pair of transport rollers for transporting the copy paper A that is pushed up by the lever 16 and fed by the paper feed roller 15 serving as a paper feed mechanism for single-sided copying. Further, 1 7 and 17' are guide plates provided between the paper feed roller 15 and the transport rollers 18 and 18', and 19.19', 21°21', and 24.24' are guide plates installed between the rollers. and a pair of guide plates for guiding the copy paper between the rollers. 25 is a fixing device, and the copy paper heat-fixed here is delivered to feed rollers 26, 26'.
a first guide path that is sent out by the printer and goes to the copy tray 5 via discharge rollers 46 and 46'; and a return tool 35 that branches vertically from the first guide path
It is conveyed along the second guide path toward.

A substantially triangular transport direction switching plate 27 branches the copy paper into these two guide paths, and feed rollers 26, 26'
and the discharge rollers 46, 46'.

This conveyance direction switching plate 27 is pivoted by a pivot shaft 27a, and can be rotated about the pivot shaft 27a in response to a command signal, and as shown in FIG. The copy paper sent out from 26, 26' passes over the conveyance direction switching plate 27, follows the thread path shown by the imaginary line, passes through the discharge rollers 46, 46', and reaches the copy tray 5.
Take the first guide route towards. The other conveyance direction switching plate 27
However, as shown in FIG.
When 7b rotates in the direction opposite to the feed rollers 26, 26/, the copy paper fed out from the feed rollers 26, 26' comes into contact with the conveyance direction switching plate 27 and is branched in the vertical direction as shown by the imaginary line. Take the second guide route.

A pair of guide plates 28 are provided below the conveyance direction switching plate 27.
28' is arranged, and below this guide plate 28.28' is an auxiliary machine frame 3 that is integrally attached to the main machine frame 1.
A pair of conveyance direction control rollers 29, 2 attached to
9' is provided.

The conveyance direction control rollers 29, 29' are branched by the conveyance direction switching plate 27, and the copy paper guided by the guide plates 28, 28' is directed to the return route 35 located below by a command signal. A discharge roller 46 that rotates as if feeding (hereinafter referred to as forward rotation) or is located in a cubic manner,
It is also possible to rotate (hereinafter referred to as "reverse rotation") so as to feed the copy tray 5 through 46'.

Between the conveyance direction control rollers 29, 29' and the return belt 35 located below the conveyance direction control rollers 29, 29', there are conveyance direction control rollers 29, 29'.
The copy paper fed by the conveyance belt is returned (guided to the route 35, or the copy paper fed by the conveyance direction control rollers 29, 29' is returned to the auxiliary machine frame 3 in the direction away from the return belt.
A return direction switching device 30 is provided for guiding the vehicle to one return direction guide path 31 provided in the second direction.

The sliding R route 35 is arranged at the left end of the auxiliary machine frame 32 as shown in FIG. The paper sheet 35 is not limited to a paper sheet, and a roller conveyor may be used as long as the copy paper can be placed thereon and conveyed.

A return roller 36 is disposed on the return roller 34 and holds a return route 35, and a route roller 37 is provided diagonally above the route roller 36 and protrudes from the main engine frame 1. Auxiliary at the bottom x Le 1-40
An auxiliary roller 38 is provided between the rollers 36 and 37, and an auxiliary roller 40 is provided between the rollers 34 and 39. The copy paper conveyed by the return belt 35 is held between the auxiliary belts 38 and 40 and fed to the guide plates 41 and 41'.

The guide plates 41, 41' are attached to the second paper feed cassette 4, and a pair of reversing rollers 42, 42', which are reversing devices, are provided at their rear ends.

These reversing rollers 42 and 42' rotate (hereinafter referred to as reverse rotation) so as to send the single-sided copy paper that has been guided between the guide plates 41 and 41' to the second paper feed cassette 4. , and can be rotated in a direction away from the second paper feed cassette 4 (hereinafter referred to as normal rotation). Note that the reversing devices 42 and 42' are not limited to rollers, but may be of any type as long as they can feed the reversed, one-sided copy paper into the second cassette 4 in an inverted state.

Reference numeral 43 denotes a paper feed roller which is a paper feed mechanism that feeds the copy paper fed into the second paper feed cassette 4, which has already been copied on one side, to the transfer mechanism in order to copy the other side as well. The copy paper fed by the paper feed roller 43 is guided to the transport roller 20.degree. 20' via the guide plate 45, 45'.

To explain double-sided copying of copy paper using the copy paper conveying device with the above configuration, as shown in FIG.
The paper feed cassette 3 stores the copy paper A whose both sides have not been copied yet, and the second paper feed cassette 4 is an empty cassette in which the copy paper has not been completely stored. In this state, the first
The copy paper A stored in the first paper feed cassette 3 and pushed up by the lever 16 is fed from the first paper feed cassette 3 by the paper feed roller 15. This fed copy paper is transported by a pair of guide plates 17, 17ζ conveying rollers 18°18',
After passing through the guide plates 19 and 19', the conveyance rollers 20 and 2oz guide plates 21 and 21', a pair of conveyance rollers 22゜22
', the photosensitive layer of the photosensitive drum 6 facing the transfer corona discharger 13 is fed into close contact with the photosensitive layer and transferred. After the transfer is completed, the copy paper is sent to a fixing device 25 by conveyance rollers 23, 23' and is fixed thereon.

The fixed copy paper passes through the 1tdei rollers 26, 26' and comes into contact with the conveyance direction switching plate 27. In this case, as shown in FIG. 3, the conveyance direction switching plate 27 is moved upwardly about the pivot shaft 27a, that is, at the oblique side 27b, in response to a command signal in advance.
Since the rollers 26 and 26' are rotated in the direction opposite to the rollers 26 and 26', the copy paper fed out horizontally by the rollers 26 and 26' is moved in the direction of conveyance as shown by the imaginary line. It comes into contact with the plate 27, branches and is guided vertically downward, is guided by the guide plate 28, 28', and the return belt 35 is guided by the forward rotation of the conveyance direction control rollers 29, 29'.
placed on top. In this case, the conveyance direction control roller 29°2
The return direction switching device 30 provided between the return R route 35 (!:) commands the return direction to the right about the pivot shaft 30a, that is, to the direction of the route 35 as shown by the solid line ?ζ. Since it is rotated by the signal, the conveyance direction control rollers 29, 2
By the forward rotation 9', the copy paper on which one side has been transferred is smoothly placed on the return route 35 via the return direction switching device 30. At this stage, the copy paper is reversed. That is, one side that has been copied is in contact with the return belt 35, and one side that has not yet been copied is exposed. As shown in FIG. 1, the copy paper placed on this return belt 35 is
The sheet is conveyed to the right by the movement of the sheet, is held between the auxiliary belts 38 and 40, is guided to the guide plates 41 and 41' attached to the second paper feed cassette 4, and is then conveyed to the pair of reversing rollers 42 and 42'. be guided.

Due to the forward rotation of the pair of reversing rollers 42, 42', the leading end of the copy sheet A is projected from the reversing rollers 42, 42', and the rear end thereof is still attached to the reversing rollers 42, 42.
' At the stage where the reversing rollers 42, 42'
is reversely rotated by a command signal, and the copy paper A is fed into the second paper feed cassette 4 with one side that has not yet been copied facing up.

Next, in order to copy the other side that has not been copied, the conveying direction switching plate 27 is rotated in parallel to the conveying direction of the copy paper in response to a command signal. That is, it is displaced to the position shown in FIG. Then, the paper feed roller 43 feeds the copy paper A, which has been pushed upward by the lever 44, from the second paper feed cassette 4. This fed copy paper is placed on the guide plate 4.
5.45' and is guided to the conveying rollers 20, 20', and is transferred and fixed through the yarn path described above.
H'so-ra 26, 26', as shown by the imaginary line in FIG.
6' into the copy tray 5. In this way, double-sided copying can be completed.

In this manner, during double-sided copying work, there are cases where, for example, when the barges of a book or the like are aligned in sequence, the copying may end at the odd-numbered page. In this case, the final copy can be made on only one side, but it becomes necessary to invert and align the pages on the copy tray 5.

Then, in order to reverse the paper, the copy paper that has been copied on one side is fed into the second paper feed cassette 4 by the return route (route 35) in the auxiliary machine frame 32. Copying must be performed, which is time consuming and troublesome.In order to avoid such trouble, a method as shown in FIG. 4 is used.First, the conveyance direction control rollers 29, 29
In response to a command signal, the return direction switching tool 30 provided between the The feed direction switching tool 30 is connected to the return direction guide path 31.

Then, the copy paper fed from the first paper feed cassette 3 and having one side copied is pulled out as shown by the imaginary line by the conveyance rollers 26 and 26', comes into contact with the conveyance direction switching plate 27, and is guided downward. and conveyance direction control rollers 29, 29
The forward rotation of the copy paper leads the copy paper to the return direction switching guide path 31 as shown by the imaginary line via the return direction switching device 30, but the leading edge of the copy sheet separates from the transport direction control rollers 29 and 29' and is returned. Although the conveyance direction switching guide path 31 is in contact with the conveyance direction control rollers 29 and 29 at the stage where the rear end portion is still held between the conveyance direction control rollers 29 and 29', the conveyance direction control rollers 29 and 29
' by rotating the transport direction control roller 29 in the opposite direction.
, 29', the copy sheets are guided to discharge rollers 46, 46', and if they are fed into the copy tray 5 in an inverted state, they can be aligned in one line.

By the way, in this case, the conveyance direction control roller 29°29'
By rotating the paper in the reverse direction, the reversed copy paper is sent to the second paper feed cassette 4, and immediately placed in the copy tray 5 without being jammed.
However, although the leading edge of the copy paper is separated from the conveyance direction control rollers 29, 29' and is in contact with the return direction switching guide path 31, the rear end of the copy sheet is still attached to the conveyance direction control rollers 29, 29'. If the conveyance direction control rollers 29, 29' are rotated in the reverse direction while the paper is being held between the paper trays 5 and 5, the next copy paper on which the image has been transferred will be placed in the 4th standard. (It is pulled out from the rollers 26, 26' and comes into contact with the conveyance direction switching plate 27, and the guide plates 28, 2
8', conveyance direction control rollers 29, 29'
may be guided by. As a result, due to the reverse rotation of the conveyance direction control rollers 29 and 29', the copy paper heading upward to the copy tray 5 is pulled out from the conveyance rollers 26 and 26', comes into contact with the conveyance direction switching plate 27, and is transferred downward to the conveyance direction. A troublesome problem arises in that the next copy sheet heading toward the control rollers 29, 29' collides with each other, resulting in a paper jam phenomenon. This is particularly a problem for models that perform medium to high speed continuous copying.

Therefore, when the conveyance direction control rollers 29, 29' are rotated in the reverse direction to feed the copy paper to the copy tray 5, the next copy paper is fed from the first paper feed cassette 3 to the paper feed roller 15 which is the paper feed mechanism. The distance between the conveyance direction control rollers 29, 29
If the setting is longer than the normal rotation of the transport direction control rollers 29 and 29', the copy paper will be delivered to the copy tray 5 by the reverse rotation of the transport direction control rollers 29 and 29', and then the next copy paper will be transferred to the transport rollers 26 and 2.
Since the sheet is pulled out from the sheet 6', contacts the conveyance direction switching plate 27, branches downward, and is guided to the conveyance direction control rollers 29, 29', the paper jam phenomenon does not occur and the above-mentioned disadvantages are eliminated. The paper feeding interval is set in advance, for example, at a feeding interval of 40 sheets per minute when the first general feed direction control rollers 29, 29' are rotating in the forward direction, and at a feeding interval of 20 sheets per minute when rotating in the reverse direction. However, the paper feed roller 15 may be operated using a timer or the like.

(Effects of the Invention) As detailed above, since the present invention has the above configuration, it is possible to perform double-sided copying of copy paper, which was difficult in the past, and as a result, copy paper can be saved and storage is efficient. becomes.

Furthermore, since the conveyance direction control roller can be rotated in forward and reverse directions, it is possible to reverse the copy paper after one-sided copying without returning it to the second paper feed cassette, which is effective for easy alignment.

Further, when the transport direction control roller rotates in the reverse direction, the paper feed mechanism operates so that the paper feeding interval of the paper feed mechanism that feeds the copy paper becomes longer than when the transport direction control roller 2!9, 29' rotates forward. Since the intervals are set in advance, paper jams will not occur, making copying operations smoother and improving copying efficiency.

[Brief explanation of the drawing]

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 cross-sectional view of the copying machine, FIG. 3 is an explanatory diagram of the conveyance direction control roller in a normal rotation state, and FIG. 4 is an explanatory diagram of the conveyance direction control roller in a reverse rotation state. 3...First paper feed cassette, 4...Second paper feed cassette, 5...
Copy tray, 15...Paper feed roller, 29.29'...Conveyance direction control roller. Applicant: Junya Suzuki, Patent Attorney, Mita Kogyo Co., Ltd. Figure 4

Claims (1)

[Claims] Conveying direction control rollers 29, 2 that convey copy paper A supplied from the first paper feed cassette 3 and having an image transferred and fixed on one side in a commanded direction based on a command signal.
9', and a return device 35 for returning the copy paper A fed by the conveyance direction control rollers 29, 29' toward the second paper feed cassette 4; a reversing device 42, 42' that feeds the copy paper A, which has been printed, into the second paper feed cassette 4 in a state where it is inverted so that the image is transferred to the other side; and the paper feed cassette 3°4.
and a paper feeding mechanism for feeding the copy paper A to the transfer mechanism, and when the conveyance direction control rollers 29, 29' rotate forward in accordance with the command signal, the copy paper A is sent to the return device 35. , the conveyance direction control roller 29,
29' reversely rotates according to the command signal, the copy paper A is sent to the copy tray 5 without being sent to the return device 35. In the copy paper transport device for a copying machine, the transport direction control rollers 29, 29 When ' rotates in the reverse direction, the operation interval of the paper feed mechanism that feeds the copy paper is set in advance so that the paper feed interval of the paper feed mechanism that feeds the copy paper is longer than when the transport direction control rollers 29, 29' rotate forward. Copy paper transport device for the copier being set.