JPS60159757A - Carrying device of copy paper for copying machine - Google Patents

Abstract

PURPOSE:To improve the efficiency of double face copying by providing the second paper supply cassette with inverting rolls, which invert copy papers with pictures copied on one face and send them to the second paper supply cassette, and a placing plate which moves sent copy papers upward or downward as required. CONSTITUTION:A copy paper P which has one copied face turned down and is guided by guide plates 39 and 39' and is led to inverting rolls 40 and 40' has the front end part separated from inverting rolls by forward rotation of inverting rolls and has the rear end part held between inverting rolls. When inverting rolls 40 and 40' are rotated reverse in this stage, the copy paper P passes a transfer tray 44 of the second paper supply cassette 4 and is sent onto a placing plate 45. When a motor 47 is started after copy papers where pictures are copied on one faces are stored in a certain degree on the placing plate 45, the placing plate 45 is moved upward to the position of a paper supply claw 53 around a pivot 46a, and the copying operation of the other faces is started. Thus, the efficiency of double face copying in a small-sized machine is improved.

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.
In order to save copy paper, the need for double-sided copying has arisen 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 this double-sided copy, one side of the copy paper is copied and the copy paper that is ejected from the output port is artificially turned over.
This has the disadvantage of being inefficient because it is carried out using a complicated method of setting it in the inlet and copying again.

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 mechanism and requires a large amount of equipment. As a result, it was inconvenient that it could not be adapted to a small desktop type machine.

(Objective and Structure of the Invention) Therefore, the present invention provides copy paper p supplied from the first paper feed cassette 3, after an image has been transferred and fixed on one side.
a conveyance direction switching device 27 for conveying the information to either a first guide path toward the copy tray 5 or a second guide path branching from the first guide path based on a command signal; The second paper feed cassette is reversed so that the image is transferred to the copy paper side for a copying machine equipped with a return tool 33 that returns the paper toward the second paper feed cassette 4 by the conveyance direction switching device 27. It has reversing rollers 40, 40' that send the copy paper p to the reversing rollers 4. The main object of the present invention is to provide a copy paper transport device for a copy machine that can perform double-sided copying and improve copying efficiency.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a simplified sectional view of the copying machine showing the inverted state, and Fig. 2 is a sectional view of the copying machine in a simplified state showing the inverted state. FIG. In the figure, reference numeral 1 denotes the main machine frame of a copying machine, and a transparent plate 2 on which a document is placed horizontally is provided above the frame. The first paper feed cassette 3, which stores the copy paper p, is attached to the center shaft at the right end of the main machine frame 1, as shown in FIG. A 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 mounted on the main machine frame 1 in this way are not limited to the three stages of the first paper feed cassette 3 and the second paper feed cassette 4, which are installed side by side in the vertical direction. A large number of stacks, such as three stacks, may be arranged in a vertical direction to store copy sheets of various sizes.

Approximately in the center of the main engine frame l is the entire circumferential surface? A photosensitive drum 6 coated with a photosensitive layer (not shown) is rotatably mounted, and the light projected onto the document on the transparent plate 2 and reflected is transmitted through movable reflecting mirrors 7, 8 and an inlet. The image of the document is projected onto the photosensitive layer through the mirror lens 9 and the reflecting mirror 10 to form an electrostatic image on the photosensitive layer. Around the photosensitive drum 6, there is a photosensitive layer and a charging corona discharger 11 for charging.
A developing device 12 that visualizes the electrostatic latent image formed on the photosensitive layer to form a toner image, a transfer corona discharger 13 for transferring the toner image formed on the photosensitive layer onto copy paper, and a post-transfer system. A cleaning device 14 for removing toner remaining on the photosensitive layer is disposed. 15 is a paper feed roller that feeds the copy paper p stored in the first paper feed cassette 3 in order to transfer and fix it; 16 is a paper feed roller that feeds the copy paper p stored in the first paper feed cassette 3;
This is a lever that pushes up the copy paper p stored in the paper feed roller.

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

Reference numeral 23' designates a pair of transport rollers for transporting the copy paper p fed by the paper feed roller 15 for single-sided copying. Further, 17.17' is a guide plate provided between the paper feed roller 15 and the conveyance roller 1'8. and a pair of guide plates that guide the rollers between the rollers. Reference numeral 25 denotes a fixing device, and the copy paper heat-fixed here is sent out by delivery rollers 26, 26', passes through discharge rollers 43, 43', and goes to a first guide path toward the copy tray 5, and from this first guide path. It is conveyed along a second guide path that branches in the vertical direction and heads toward the return device 33. 24.24' is the transport roller 23 and the fixing device 2
This is a guide plate installed between 5 and 5.

and the discharge rollers 43, 43'.

This transport direction switching device 27 is pivoted by a pivot shaft 2'7a, and can be rotated about the pivot shaft 27a in response to a command signal, and when rotated in the horizontal direction as shown in FIG. The copy paper sent out from the delivery rollers 26, 26' passes over the conveyance direction switching device 27, and takes the first guide path toward the copy tray 5 via the discharge rollers 43, 43' according to the thread path shown by the imaginary line. . On the other hand, when the conveyance direction switching device 27 rotates upward as shown in FIG. The copied paper comes into contact with the conveying direction switching device 27 and is branched vertically downward to take a second guide path as shown by the imaginary line.

A pair of guide plates 28 are provided below the conveyance direction switching device 27.
．． 28' is disposed, and below the guide plate 28°28' are a pair of retraction rollers 29, 29 mounted on the auxiliary machine frame 30 which is integrally attached to the main machine frame 1.
' has been placed.

These pull-in rollers 29, 29' are connected to the transport direction switching device 2.
The copy paper branched downward in the vertical direction by 7 is sent to a return device 33 located below. The return belt 33, which is the return tool, is placed between the belt roller 31 located at the left end of the auxiliary machine frame 30 and the belt roller 32 located at its right end (strung between the belt rollers 32. The belt 33 is not limited to a belt,
A roller conveyor may also be used, as long as the copy paper can be placed on it and conveyed.

A belt roller 34 is disposed on the R seat roller 32, sandwiching a return route 33, and a belt roller 35 is provided obliquely above the route roller 34 and protrudes from the main machine frame l. An auxiliary belt 37 is provided below to hold the auxiliary belt 38, an auxiliary belt 36 is provided between the belt roller 34 and the iltro roller 35, and an auxiliary belt 36 is provided between the belt roller 32 and the iltro roller 37.
The belts 38 are stretched, and the copy paper conveyed by the return belt 33 is held between the auxiliary belts 36 and 38 and sent to the second paper feed cassette 4.

The structure of the second paper feed cassette 4 will be explained according to FIGS. 3 and 4. The second paper feed cassette 4 has a rectangular frame body, and the rear part of the bottom wall 52 is open. , a pair of guide plates 39 and 39' are attached, and this guide plate 39
, 3'9' are close to the rollers 35 and 37, and a pair of reversing rollers 40, 40 are located at the upper ends of the rollers 35 and 37.
' has been placed. This reversing roller 40, 40'
is held between the auxiliary guides 36 and 38, and the guide plate 3
9 and 39' so as to feed the copy paper into the second paper feed cassette 4 (hereinafter referred to as reverse rotation), or rotate the copy paper so as to separate it from the second paper feed cassette. (hereinafter referred to as forward rotation).

A transfer plate 44 is provided facing the reversing rollers 40, 40'.
, 40' are rotated in the reverse direction so that the copy paper p passes through this transfer plate 44 and is loaded onto the transfer plate 45. A loading plate 45 on which copy paper is loaded is pivotally attached to a side piece of the second paper feed cassette by a mounting piece 46, and is movable up and down about a pivot shaft 46a. To explain the mechanism for moving it up and down,
A motor 47 is disposed below the board 45, and a worm gear 48 is fixed to a drive shaft 49 of the motor 47.
A semicircular sprocket 50 is meshed with this worm gear 48. A push-up rod 51 is protruded from one end of the sprocket 50 in parallel with the mounting plate 45, and a push-up portion 51a formed at the tip of the push-up rod 51 comes into contact with the bottom wall 45a of the mounting plate 45. ing.

When the copy paper is fed from the reversing rollers 40, 40' to the mounting plate 45 via the transfer plate 44, the mounting plate 45 is positioned below as shown in FIG. After the required number of copies are stored on the loading plate 45, the motor 47 is started to rotate the drive shaft 49, as shown in FIG. The rotation of the drive shaft 49 causes the worm gear 48 fixedly attached to the drive shaft 49 to rotate, and the rotation of the worm gear 48 causes the sprocket 50 meshed with the worm gear to rotate in the direction of the arrow.

As the sprocket 50 rotates in the direction of the arrow, the push-up rod 51 is moved upward, and the push-up portion 51a moves upward as the push-up rod 51 moves upward, and as a result, the mounting plate 51 is pivoted. It rotates around the shaft 46a, is pushed upward to the position of the paper feed claw 53, and is placed on the mounting plate 45 by the paper feed roller 41 (FIG. 1) located directly above the paper feed claw 53. The copy paper that is currently in use is fed. Boarding board 45
After all copy sheets placed on the board have been fed, the motor 47 is rotated in the opposite direction to the direction of rotation of the motor for moving the mounting plate 45 upward. As the push-up lever 51 rotates downward, the mounting plate 45 rotates around the pivot shaft 46a and moves downward, as shown in FIG. Return to horizontal position. In this way, the second paper feed cassette 4 is provided with a mechanism for moving the loading plate 45 up and down as necessary, so as shown in FIG. A push-up lever for feeding copy paper is not required.

As a result, the push-up lever operates before the copy paper enters the paper feed cassette, and there is no problem with the copy paper entering. At the same time, the loading plate 45 can be moved up and down as desired, so that when the copy paper is stored on the loading plate 45, the loading plate 45 can be reliably lowered to a horizontal position. There is no problem in storing it on the board 45.

To explain double-sided copying of copy paper using the copy paper conveying device configured as described above, the first paper feed cassette 3 containing copy paper p whose both sides have not yet been copied, and the all-thermal copy paper An empty second paper feed cassette 4 is attached to the machine frame 1 of the copying machine as shown in the first diagram. At the same time, the mounting plate 45 provided in the second paper feed cassette 4 is held in the position shown in FIG. 3, that is, in a horizontal position. In this state, as shown in FIG. 1, the copy paper p, which has been pushed up by the lever 16 housed in the first paper feed cassette 3, is fed from the paper feed cassette 3 by the paper feed roller 15. The fed copy paper passes through a pair of guide plates 17, 17', transport rollers 18, 18', guide plates 19, 19', transport rollers 20, 20', and guide plates 21, 21', and then passes through a pair of transport rollers. 22, 22'
The photosensitive layer is transferred to the photosensitive layer of the photosensitive drum 6 facing the transfer corona discharger 13 so as to be brought into close contact with the photosensitive layer. After the transfer is completed, the copy paper is sent to the fixing device 25 via the guide plates 24 and 24' by the conveying rollers 23 and 23', and is fixed thereon.

The copy paper, which has been fixed by the fixing device 25 and has been transferred and fixed on one side, is sent out from the delivery rollers 26, 26'5 and comes into contact with the conveyance direction switching device 27. This conveyance direction switching device 2
7, as shown in FIG. 1, the upper part, i.e., the oblique side 27b, is rotated about the pivot shaft 27a in advance in a direction facing the feed-out roller 26° 26' by a command signal, so that the feed-out roller 26 , 26' in the horizontal direction comes into contact with the conveyance direction switching device 27 and is guided in the vertical direction, that is, the copy paper branches off from the first guide path heading toward the copy tray 5 and leads to the second guide path shown by the imaginary line. The guide path is taken, and the drawing roller 29 is guided by the guide plate 28, 28'.
By the rotation of 29', the return sheet is placed on the rotor 33, and at this stage the copy paper is turned over so that the image is transferred to the surface of the tray. 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 been copied is exposed.

As shown in FIG. 1, the copy paper placed on the return belt 33 is transported to the right by the movement of the belt 33.
Auxiliary (held by the root 36, 38 1, guide plate 39, 3
9' and fed into the second paper feed cassette 4. That is, the reversing roller 40 is guided by the guide plates 39 and 39'.
, 40', as shown in FIG.
, 40'. At this stage, the reversing roller 40
When the rotation angle 40' is reversed, the copy paper p passes through the transfer device 44 and is fed onto the loading plate 45. In this way, when the motor 47 is started after a sufficient amount of copy paper with one side copied is stored on the mounting plate 45, the drive shaft 49 rotates.
A sprocket 50, which is fixed to the drive shaft 49 and meshes with the worm gear 48, rotates in the direction of the arrow as shown in FIG. 4, and the rotation of the sprocket 50 in the direction of the arrow causes the push-up rod 51 to A push-up portion 51 that moves upward and is formed at the tip of the push-up rod 51 as a result.
a rotates the loading plate 45 around the pivot shaft 46a and the paper feed claw 53.
A kokichi is created that moves upward one step to the position of .

Next, in order to copy the other side that has not been copied yet,
In response to the command signal, the conveyance direction switching device 27 is rotated about the pivot shaft 27a in parallel to the direction of electric transmission of the copy paper. That is, it is displaced to the position shown in FIG. Then paper feed claw 5
The copy paper placed on the loading plate 45, which has moved upward to position 3, is fed from the second paper feed cassette 4 by the paper feed roller 41, as shown in FIG. The fed copy paper is guided by guide plates 42 and 42' and conveyed to conveyance rollers 20 and 20', where it is transferred and fixed via the aforementioned thread path and sent to feed rollers 26 and 26.
Then, as shown by the imaginary line in FIG. 2, the sheet passes over the conveyance direction switching device 27 and is sent into the copy tray 5 by the discharge rollers 43 and 43' along the first guide path toward the copy tray 5.

In this way, duplex copying of the copy paper is completed. Note that when all copy sheets placed on the loading plate 45 of the second paper feed cassette 4 have been fed, the motor 47 moves the loading plate 45 upward and stops rotating in the opposite direction. By rotating, the mounting plate 45 is lowered to the position shown in FIG. 3, and is at the same level as the transfer tray 44, in preparation for the introduction of the next copy sheet.

(Effects of the present invention) As detailed above, since the present invention has the above configuration, double-sided copying of copy paper, which has been difficult with conventional small desktop copying machines, is possible with a simple configuration.
As a result, copy paper can be saved and storage becomes efficient.

In addition, the loading plate can be moved up and down as necessary, so when the copy paper is fed by the reversing roller and stored on the loading plate, the loading plate can be lowered to a horizontal position. Therefore, there is no problem in storing copy paper on the board.

[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 a cross-sectional view of the second paper feed cassette showing the loading plate in a lowered state; FIG. 4 is a cross-sectional view of the second paper feed cassette showing the loading plate in a raised state; FIG. 3 is a cross-sectional view of the paper feed cassette. 1...First paper feed cassette, 4...Second paper feed cassette, 5...Copy tray, 27...Transportation direction switching device, Applicant Sanda Kogyo Co., Ltd. Agent Patent Attorney Junya Suzuki

Claims (1)

[Claims] The copy paper p supplied from the first paper feed cassette 3 and having an image transferred and fixed on one side is guided to the copy tray 5 based on a command signal through a first guide path; A conveyance direction switching device 27 that conveys paper to either one of the second guide paths branching from the guide path, and a return tool 33 that returns paper toward the second paper feed cassette 4 by this conveyance direction switching device 27. In a copy paper conveying device for a copying machine,
The second paper feed cassette 4 includes a reversing roller 40 that inverts the copy paper p returned by the return tool so that an image is transferred to the other side and feeds it into the second paper feed cassette 4. ，
40', and a loading plate 45 on which the copy paper p fed from the reversing rollers 40 and 40' is moved up and down as required.