JPS6045097B2 - Paper reversal conveyance device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper reversal conveyance device used in a copying machine or the like.

Copy paper that has been copied by a copying machine is normally ejected with the image side facing up, so when copying a document consisting of multiple sheets, the ejected copy paper is directly conveyed to a collator and collated, or When stacked in the output tray,
Later copies are stacked on top of each other with the front side facing up, and the order of the stack of copy sheets on the tray is reversed to the order of the originals.

Manually rearranging the sheets in the correct order takes time and effort, which not only impedes work efficiency but also causes misprints. Therefore, if the fixed copy sheets are turned over one by one and then discharged to a collator or a paper discharge/tray, the documents will be automatically collated in the original order. Typical examples of sheet reversing conveyance devices that have been conventionally used or proposed for this purpose are as shown in FIGS. 1 to 3.
As shown in the figure, a gate 20 having a guide surface for deflecting the paper is provided in the middle of the paper conveyance path, and during normal conveyance, the paper conveyance path is as shown by solid lines in FIGS. The paper is held in a position where it is not obstructed, and the paper is fed in the direction of the solid arrow, and is discharged to the next process by the conveyance roller 23. 5
When reversing, the gate 20 is moved to a position that blocks the conveyance path as shown by the broken line, and the conveyed paper is deflected toward the reversing section along the guide surface of the gate 20, and then the drive belt provided at the reversing section 21, rollers 24, etc., or push back the front end of the paper with the stopper 22, and push the paper back into the conveyance path with the trailing edge first, as shown by the chain line.
We are trying to discharge it by this method. In conventional devices, as shown in the example above, the reversing section and the transport section are separated, and switching between reversing and non-reversing is done by changing the position of a gate provided on the paper transport path, which saves space. This increases the size of the copying machine itself. Furthermore, with the push-back mechanism described above, the next sheet cannot enter the reversing section until the previous sheet has completely escaped from the reversing section. Moreover, it is unsuitable for applications in which paper is fed at high speed. In addition, in the case where the end of the reversed paper is pushed back with a stopper, as in the example shown in FIG. It is possible to feed the paper, but since it uses the stiffness of the paper itself, there is a drawback that the push-back operation becomes uncertain if the paper is thin or if the paper is rolling due to high humidity. be. In view of the above-mentioned drawbacks of conventional devices, the present invention has been devised to convey paper that is continuously discharged at a high speed at small intervals, while reliably reversing the front and back, and to switch between reversing and non-reversing. The objective is to provide a reversing conveyance device that requires less space than the other devices.

This invention will be explained based on FIGS. 4 and 5 showing an embodiment of the invention. In the path of the paper sent out from the fixing section of the copying machine, there is a reversing drive roller 6 and a shaft on the axis of the reversing drive roller 6, respectively. two driven rollers 4, front and rear, which are each supported pivotally near the ends of the two supported arms 4a, 5a, and are pressed against the reversing drive roller 6 by coil springs 4b, 5b;
5 is provided.

Each of the arms 4a and 5a has one camshaft 13.
The cams 9a, 9b are engaged with the cams 9a, 9b fixed to the cams 9a, 9b.
As a result of the displacement, the driven rollers 4 and 5 are displaced along the outer periphery of the reversing drive roller 6. In the normal mode (when the paper is transported without reversing it), the driven rollers 4 and 5 are held in close (intersecting) positions as shown in FIG. case), the driven rollers 4 and 5 are held at positions spaced apart from each other, as shown in FIG. In the above reversal mode, the traveling direction of the paper discharged from the front driven roller 4 and the driving roller 6 (the direction of the cutting line at the contact point of the two rollers) is formed between the pair of guide plates 14 and 15. reversing section 1
It is facing the entrance of 6. The lower part of the guide plate 15 is curved forward, and forms a guide surface that guides the paper between the rear driven roller 5 and the drive roller 6 when the paper is pushed back by the return roller 1, which will be described later. The return roller 1, which pinches the paper path of the reversing unit 16 and rotates in the direction of pushing back the paper at all times, is provided with a pressure applied to the return roller 1 by a return roller pressure solenoid 3 at a position opposite thereto. A pressure roller 2 is provided.

0n-0ff of the above return roller pressure solenoid 3 is as follows:
As shown in FIG. 5, it is controlled by a microswitch (not shown) activated by a paper detection feeler 7 whose tip protrudes into the paper path immediately after the contact point between the front driven roller 4 and the drive roller 6. When the refiller 7 is passing over the tip of the refiller 7 and pushing down the upper end of the refiller 7, the return roller pressure solenoid 3 becomes 0ff, and the pressure roller 2 remains retracted to the outside of the guide plate 15. . In addition, when there is no paper on the upper end of the paper detection feeler 7 and the feeler 7 protrudes into the paper path, the return roller pressure solenoid 3 becomes 0n, the arm 17 rotates, and the pressure roller 2 It comes into pressure contact with the return roller 1 and follows it.
A reversal set solenoid 11 is provided to displace cams 9a and 9b for switching the positions of the driven rollers 4 and 5 between the normal mode and the reversal mode. One end of the reverse set release lever 10 is engaged.

The other end of the reverse set release lever 10 is provided with claws 10a and 10b facing each other. It has the function of engaging and disengaging the spring clutch by fitting into and disengaging a groove provided on the outer surface of the sleeve (not shown). Immediately after the pair of conveyance rollers formed by the drive roller 6 and the rear driven roller 5, there is a route switch for switching the paper conveyance path to either the path 18 to the collator or the path 19 to the paper discharge tray. A gate 12 is provided. Now, when using the apparatus configured as described above to transport paper without reversing it in the normal mode, the route switching gate 12 should be moved to either the collator side or the paper output tray side as desired. , and the inversion set solenoid 11 remains at 0ff.

If the reverse set solenoid was previously used in the reverse mode, the suction force of the solenoid is removed by turning off the reverse set solenoid, and the reverse set release lever 10, which is in the position shown in Fig. 5, is turned clockwise. The camshaft 13 rotates and is displaced to the position shown in FIG. 4, and the pawl 10b comes out of the groove on the outer periphery of the sleeve of the spring clutch (not shown), and the spring clutch enters and the camshaft 13 becomes integrated with the constantly rotating drive shaft. Rotate. However, at the same time, the other pawl 10a comes into pressure contact with the outer peripheral surface of the sleeve of the spring clutch and slips, so when the sleeve rotates together with the camshaft 13 and the aforementioned groove reaches the position of the pawl 10a, the pawl 10a fits into the groove. The rotation of the sleeve is restricted and the spring clutch is disengaged.
The rotation of the camshaft 13 is stopped, and the cams 9a and 9b are held at the positions shown in FIG. are displaced and maintained at the closely intersecting position shown in FIG. As mentioned above, by using a spring clutch and appropriately setting the distance between the two pawls 10a and 10b of the reverse set release lever 10 (the distance measured along the outer circumferential surface of the sleeve), the driven rollers 4 and 5 can be moved. It becomes possible to easily and accurately switch between the normal mode and the reverse mode. In this state, the leading edge of the paper fed from the fixing section is held by the driving roller 6 and the front driven roller 4, and immediately after being fed out, it is held by the driving roller 6 and the rear driven roller 5, and the route is switched. The paper is sent out to either the path 18 to the collator selected by the gate 12 or the path 19 to the discharge tray without being turned over. In this case, as shown in FIG. 4, the actuator 8 of the paper detection filler 7 is pushed by the cam 9a, and the upper end of the feeler 7 is held in a position that does not protrude from the outer peripheral surface of the drive roller 6, so that the paper is not detected. Accidents such as jams caused by this can be prevented. Next, when switching from the normal mode shown in FIG. 4 to the reverse mode shown in FIG.
0 rotates counterclockwise from the position shown in FIG.
At the position shown in the figure, the pawl 10a escapes from the groove of the sleeve of the spring clutch, and at the same time the pawl 10b abuts against the surface of the sleeve. Therefore, in exactly the same way as in the case of switching from the reverse mode to the normal mode, the cams 9a, 9
b is displaced and maintained at the position shown in FIG. 5, and accordingly, the driven rollers 4 and 5 are also displaced and maintained at positions spaced apart from each other as shown in FIG. Also, by displacing the cam 9a, the actuator 8 of the feeler 7, which was being held down by the cam 9a, becomes free, and the upper end of the feeler 7 enters the paper path at a position immediately after the contact point between the driven roller 4 and the drive roller 6. stand out. In this state, the leading edge of the paper sent out by the front driven roller 4 and the driving roller 6 obliquely hits the guide plate 15 and then returns along the guide plate 15 into the reversing passage 16 to the roller 1.
Proceed towards.

At this time, until the paper leaves the driven roller 4, the paper detection feeler 7 is pressed down by the paper, and the microswitch that controls the energization of the return roller pressure solenoid 3 is activated so that the solenoid 3 is turned off. However, the return roller pressure solenoid 2 maintains the retracted position outside the guide plate 15 as shown in FIG. 4, and does not prevent the paper from moving forward between the return roller 1 and the pressure roller 2. do not have. However, when the trailing edge of the paper leaves the front driven roller 4 and the driving roller 6, the paper, which had been forcibly curved by the guide plate 15 and the rollers 4 and 6, is bent by its own stiffness to the trailing edge. is displaced so that it faces between the rear driven roller 5 and the driving roller 6. At the same time, the paper detection feeler 7 returns to its original protruding position, so that the return roller pressure solenoid 3 is energized and presses the pressure roller 2 against the return roller 1 via the lever 17. As a result, the paper that was advancing in the reversing section passage 16 is pushed back in the opposite direction by the return roller 1, and is inserted from the rear end along the guide plate 15 between the rear driven roller 5 and the drive roller 6. It is transported to the next process with its front and back sides converted. 9 When paper is continuously fed from the fixing unit at short intervals, the paper detection feeler 7 is activated as soon as the leading edge of the next paper is gripped by the front driven roller 4 and the drive roller 6 and fed out. operates,
Since the return roller pressure solenoid 3 becomes 0ff and the pressure roller 2 separates from the return roller 1, the next sheet is already being conveyed by being held between the rear driven roller 5 and the drive roller 6 at that point. The paper moves forward between the previous paper and the guide plate 14 in the direction opposite to the advancing direction of the previous paper. When the trailing edge of the paper leaves the paper detection feeler 7, the pressure roller 2 again presses against the return roller 1 and pushes the paper back toward the rear driven roller 5. In this way, even when sheets are fed one after another at short intervals, they can be reliably turned over without delay and sent to the next process.
As described above, according to the present invention, it is possible to switch between reversal conveyance and normal conveyance of paper simply by displacing the positions of the two driven rollers along the outer periphery of the drive roller. It requires less space and the entire machine can be made smaller.

In the reversing mode, the paper is forcibly pushed back until it is gripped by the rear driven roller by a constantly rotating return roller and a pressure roller that presses it for the required time when pushing the paper back. Not only does the conveying operation become reliable, but it also becomes possible to reversely convey sheets that are successively conveyed at short intervals without delay, and a remarkable effect can be obtained in improving work efficiency.

[Brief explanation of the drawing]

1 to 3 are side views showing an example of a conventional sheet reversing conveyance device, and FIGS. 4 and 5 are side views showing the state of the apparatus according to the embodiment of the present invention in normal mode and reversing mode, respectively. It is. 1... Return roller, 2... Return roller pressure roller, 3
... Return roller pressure solenoid, 4... Front driven roller, 5... Rear driven roller, 6... Reversing drive roller, 7... Paper detection feeler, 9a, 9b... Reversing set Cam, 10...Reverse set release lever, 1
1...Reverse set solenoid.

Claims (1)

[Claims] 1. It has a drive roller that always rotates in one direction and two driven rollers that are in pressure contact with the drive roller, and the two driven rollers can be in a non-inverted state in which they are close to each other and in a non-inverted state in which they are separated from each other. 2 of the inverted state
at least one driven roller is displaceable along the outer periphery of the drive roller so as to be able to assume two states;
1. A paper reversing conveyance device comprising: a reversing section path extending from between both driven rollers to temporarily guide the paper for reversal when both driven rollers are in a reversed state. 2. The sheet reversing conveyance device according to claim 1, wherein the displacement of the driven roller is performed by a cam controlled by a spring clutch. 3. During reversal conveyance, a return roller that constantly rotates in the push-back direction and a pressure roller that can come into contact with and separate from the return roller are provided as means for pushing back the paper guided into the reversing section path in the opposite direction. The sheet reversing conveyance device according to claim 1 or 2, characterized in that the sheet is displaced by a solenoid controlled by a sheet detection feeler provided at a position immediately after passing the first driven roller. . 4. The sheet reversing conveyance device according to claim 3, wherein the sheet detecting feeler is displaced and held at a position where it does not protrude into the sheet path during non-reversing conveyance.