JPS61140425A - Double-face copying tray device of double-face copying machine - Google Patents

Abstract

PURPOSE:To prevent the clogging of succeeding sheets by correcting the rear end curl of sheets fed into the tray of a double-face copying tray device with a rear end curl presser and correcting the front end curl with a front end curl presser. CONSTITUTION:A front end curl presser 12 is provided movably up and down above the front end side of the tray 7 of a double-face copying tray device 6, and a rear end curl presser 14 is provided movably up and down alternately with the front end curl presser 12 and in conjunction with the front end curl presser 12 above the rear end side of the tray 7. When a sheet 23 is fed to the device 6 and a sensor 22 is turned on, the front end curl presser 12 starts to rise after a fixed time before the tip of the sheet 23 hits the front end curl presser 12. At the same time, the curl presser 14 starts to descent, and the rear of the sheet 23 is pressed. When the curl presser 14 is further lowered, the rear end of the sheet 23 enters the woven wool of a weight with woven wool at the tip of a sheet guide 10, and the curl at the rear end of the sheet is absorbed. Then, the curl presser 12 is lowered to press the front end of the sheet 23.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a two-sided copying machine having one-sided copying function.
The present invention relates to a double-sided copying tray device in which a sheet of paper copied on the front side is stored upside down and fed to the back side copying process in a stack.

A conventional double-sided copying tray device is shown in FIG. 6, and has a rear end of a tray b which is inclined with its tip facing a pair of paper handling rollers α.

A paper guide C whose inclination changes depending on the width of the tray b is provided, and a paper entrance path consisting of a paddle d and a guide plate is provided above the rear end of the tray 6.

And sensor f and static elimination bar on this approach path! 0 and in the conventional double-sided storage tray configured in this way, on the upper side of the leading end of tray b.

A leading edge curling presser is provided which rotates in synchronization with the paper entry cycle, and each sheet of paper is pressed down one by one by the leading edge curling presser.

Problems to be Solved by the Invention In the above-mentioned conventional example, curls at the leading edge of the sheet entering tray b are corrected by being held down by a leading edge curl presser, but curls at the trailing edge cannot be corrected. I couldn't do it.

For this reason, if the curl at the trailing edge is large, the leading edge of the following paper will hit this curl, causing a paper jam 9. Furthermore, even if paper jams do not occur, there is a problem in that the capacity is poor.

Means and Function for Solving the Problems The present invention has been made in view of the above-mentioned problems, and includes a tip curling press that is movable up and down above the tip side of the tray of a tray device for single-sided copying. The structure is such that a trailing edge curling press is provided above the trailing edge side, which moves with the leading curling press and moves up and down alternately with the leading edge curling presser. The rear end is held down by a curl presser K, and then the tip is held down by a tip curl presser.

Embodiment An embodiment of the present invention will be described based on FIGS. 1 to 5.

Figure 1 shows the paper path of a copying machine that has a double-sided copying function. Paper is fed one by one from paper tray 1, and after being copied onto the surface by photoreceptor 2, it is fixed by conveyance device *3. It is transported to the container 4.

Then, the sheet that has come out of the fixing device 4 is reversed by a reversing section 5 and stored in a tray 7 of a double-sided application tray device 6. After a predetermined number of sheets are stored in this tray 7, they are ejected one by one from this tray 7, and are copied on the back side by the primary photoreceptor 2.

The image is sent from the conveying device 3 to a fixing device 4, and is discharged from the fixing device 4 to a catch tray S facing outside the machine.

The double-sided copying tray device 6 is constructed as shown in FIG. 2, with reference numeral 9 a pair of separating rolls provided at the front end of the tray 7, and 10 a paper guide provided at the rear end of the tray 7.

The paper guide 10 is connected to the rear end of the tray 7 in such a manner that it is bent toward the front end of the tray 7, and its inclination angle is set to the rear end of the tray 7.
It is designed to change as the side guide 11 on the movable side moves.

That is, as shown in FIG.
4. B5. Depending on the position of B4, the one-sheet guide 10 can be changed to the position shown in FIG. 2, respectively.

12 is a tip curl presser, and this tip curl presser I2
is provided above the leading end of the tray 7, and rotates in synchronization with the cycle of paper entering the tray 7 to press the leading end from above. 13 is its driving device.

Reference numeral 14 denotes a trailing end curling holder located above the rear side of the tray 7. This trailing end curling holder 14 is rod-shaped, and its base end is connected to a link 15 whose intermediate portion is pivoted to the side guide 11 on the movable side. is fixed to the tip of. The link 15 is pivotally supported on the outside of the side guide II.
It passes through an arcuate long hole 16 provided in the tray 7 and extends above the tray 7. A groove 17 is provided at the base end of the link 15, and this groove 17 engages with a beyl& provided protruding from the side of the tip curl presser I2. Projection length t of the above bottle 1g
When the side guide 7 on the movable side is in the 85° A4 position, it engages with the link 15011117, and when the side guide 7 is in the B5 position, the groove 17 of this link I5 engages.
It is long enough to slip through.

A weight 19 with cilia is rotatably provided at the tip of the paper guide 10 provided at the rear end of the tray 7.

In addition, in FIG. 2, 20 is a paddle, 21 is a static elimination bar,
22 is a sensor that detects when the next sheet is sent. Further, the link 15 is biased by a spring in the direction in which the rear end curling presser 14 moves upward, and when the link 15 is disengaged from the link 18 of the tip curling presser 12, the rear end curling presser 14 always moves upward. The operation of the above configuration will be explained with reference to FIGS. 4(A) to 4(E).

When the paper 23 is sent to the double-sided copying tray device 6 and the sensor 22 is turned on [FIG. 4(A)], after a certain period of time,
Before the tip hits the tip curl presser 12,
The tip curl presser 12 starts to rise [Fig. 4 (B)]. At the same time, the trailing edge curl presser 14 starts to descend in conjunction with this, and the trailing edge portion of the paper 23 is pressed down by the trailing edge curling press t14, thereby suppressing the curl (FIG. 4(C)). When the trailing end curling presser 14 further descends, the trailing end of the paper 23 is moved by the cilia 19 of the cilia-equipped weight 19 provided at the tip of the paper guide lO.
α, and the curl at the trailing edge of the paper is absorbed.
Figure (D)].

Thereafter, the leading edge curl presser 12 is lowered to suppress the curling of the leading edge of the paper 23 (FIG. 4(E)).

The above operation is when the paper size is 85, (4),
When the paper 23 becomes B4, the movement of the movable side guide 11 at this time disengages the pin 1g of the leading edge curling holder 12 and the link 15 of the trailing edge curling holder 14, causing the trailing edge curling holder to disengage. 14 is retracted to a position above where it does not get in the way. Also, due to the movement of the side guide 11 at this time, the paper guide 10 rotates in the direction along the bottom surface of the tray 7, and the paper 23 that has entered the tray 7 is struck by the paddle 20 and pressed against the bottom of the paddle 20 ( Figure 5).

Effects of the Invention According to the present invention, the trailing edge of the paper 23 entering the tray 7 of the single-sided copying tray device 6 is curled by the trailing edge curl presser 14, and the leading edge side is curled by the tip curl presser I.
In step 2, each curl is pressed alternately and each curl is corrected.

Paper jams due to subsequent sheets colliding with sheets in the tray 7 are eliminated, and the ability to accommodate sheets in the tray 7 is improved.

[Brief explanation of drawings]

1 to 5 schematically show an embodiment of the present invention, in which FIG. 1 is a paper path diagram of a copying machine having a double-sided copying function, and FIG. 2 is a side view of the main parts. Figure 3 is a plan view of the main part, Figure 4 (/ri, (B),
(C). (D) and (E) are action explanatory diagrams, and the paper in Figure 5 is 84
FIG. 6 is a schematic configuration explanatory diagram showing a conventional example. 0 6 is a double-sided copying tray device, 7 is a tray, 12 is a leading end curl presser, and 14 is a rear end curl presser 0th. Figure 1 Figure 3 Figure 5 Figure 6

Claims (1)

[Claims] In a double-sided copying tray device of a copying machine having a double-sided copying function, a tip curl presser 12 is vertically movably provided above the leading end of the tray 7, and a tip curling presser 12 is provided above the rear end of the tray 7.
The tip curl presser 12 is interlocked with the tip curl presser 12, and the tip curl presser 12
A double-sided copying tray device for a double-sided copying machine, characterized in that a trailing end curl presser 14 is provided so as to move up and down alternately.