JPS641383B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a paper reversing/folding device for use in copying machines and the like for reversing and folding paper.

Prior Art As shown in FIG. 1, there is a roller mechanism consisting of first and second rollers 1 and 2 that are in pressure contact with each other, and a third roller 3 that is in pressure contact with the second roller 2, a folding stopper 4, and a reversing weight 5. , a guide plate 6, and guides the copy paper 8 discharged from the fixing roller 7 to the first and second
The rollers 1 and 2 feed the copy sheet 8 toward the guide plate 6, and the solenoid 9 causes the folding stopper 4 to protrude from the opening 6a of the guide plate 6, as shown in FIG. The second roller 2 and the third roller
Feed it into the nip with the third roller 3.
The copy paper 8 is folded by folding it in half with the second roller 2 and then being discharged, and the copy paper 8 is placed on the guide plate 6 without the folding stopper 4 protruding from the guide plate 6 as shown in FIG. The copy paper 8 continues to be sent out by pushing up the reversing weight 5 along the arcuate groove 6b of the guide plate 6, and when it leaves the nip section of the first and second rollers 1 and 2, the weight of the reversing weight 5 makes a copy. Paper 8 is transferred to the second and third rolls 2,
A paper reversing/folding device is known that reverses the front and back sides of the copy paper 8 by inserting it into the nip portion 3 and discharging the copy paper 8 after reversing the front and back sides.

However, since the above-mentioned paper reversing/folding device uses reverse force acting on the paper or loops caused by buckling to perform reversal or folding, different types of paper may have different stiffness, If the paper is fed in a curled state, the paper may jam, the fold position may be misaligned, or the paper may slip when turned over, causing the paper to be ejected at a different time.

For example, if paper is weak or curled, the paper may jam and the paper may not be turned over.

Further, the folding position of the paper is determined by the position of the folding stopper 4, and the folding position of the paper cannot be arbitrarily changed.

Purpose of the Invention Even if paper has different stiffness, curled paper may cause paper jams, the fold position may be misaligned, etc.
To enable reliable reversal or folding of paper without shifting the ejection timing during reversal, and to arbitrarily change the folding position.

Composition of the Invention A paper sheet that has passed through the roller mechanism is provided with a roller that applies a conveyance force in the opposite direction toward the roller mechanism after a predetermined period of time has elapsed, and a gate that feeds the sheet that has passed through the roller mechanism toward the roller mechanism.

Embodiment FIG. 4 is an overall front view, in which the first and second rollers 10 and 11 are in pressure contact, and the second roller 11 and third roller 12 are in pressure contact to constitute a roller mechanism. A guide 13 is provided on the delivery side of the second rollers 10 and 11, and fourth and fifth rollers 14 and 15 are disposed in pressure contact between the guide 13. , 15 are driven in forward and reverse directions by a drive source such as a motor (not shown).

Reference numeral 16 denotes a gate for switching the paper feeding direction, and is swung by a solenoid 17 between a first position shown by a solid line and a second position shown by a phantom line.

18 is a photo sensor serving as a paper detector;
the third roller 1 than the fourth and fifth rollers 14 and 15;
It is located on the opposite side of 2.

When the paper 20 is reversed and discharged, the paper 20 is transferred to the first and second rollers 10 and 1.
At the same time as shown in FIG. 5, the solenoid 17 moves the gate 16 to the second position above the guide 13,
The fifth rollers 14 and 15 are rotated normally (in the direction of the arrow) and the paper 20 is sent out in the direction of the arrow by the fourth and fifth rollers 14 and 15.

At this time, the leading edge 20a of the paper 20 is detected by the photo sensor 18, the detection signal is input to a control circuit (not shown), and the trailing edge 20b of the paper passes through the nip portion of the first and second rollers 10 and 11. When the time has elapsed, as shown in FIG. 6, the solenoid 17 moves the gate 16 to the first position and swings it downward from the guide 13.
Reverse the fourth and fifth rollers 14 and 15 (in the direction of the arrow)
The paper 20 is then reversely fed, sent out through the gate 16 toward the nip portion of the second and third rollers 11 and 12, turned over by the second and third rollers 11 and 12, and then discharged. do.

In this way, the fourth and fifth rollers 14 and 15 apply a conveying force in the opposite direction to the paper 20, and the paper 20 is transported in the reverse direction.
Since the paper is fed into the nip portion of the second and third rollers 11 and 12 at the gate 16, even paper with weak stiffness or curled paper can be reliably turned over without jamming, and the paper will not slip. It can be accurately reversed and discharged at a predetermined time.

Note that the fourth and fifth rollers 14 and 15 are kept apart at all times, and pressed into contact with each other at the time of reversing the paper 20 as described above.
You can send it back.

When folding paper, the paper 20 is fed in the same manner as described above, and after the leading edge 20a of the paper is detected by the photo sensor 18, the paper folding position 20' is moved to the second and third rollers as shown in FIG. 11,
After the time has elapsed, the solenoid 17 moves the gate 16 to the first position and the folding position 20' of the paper 20 to the second and second positions as shown in FIG. 3 rollers 11,
At the same time, the fourth and fifth rollers 14 and 15 are reversely rotated to reversely feed the paper 20, fold the paper 20 in half at the folding position 20', and discharge the paper 20.

In this way, the folding position 2 of the paper 20 at the gate 16 is
0' is bitten into the nip portions of the second and third rollers 11 and 12, so that the paper can always be folded in half at a predetermined folding position 20', and the folding position can always be kept constant regardless of the stiffness of the paper.

Furthermore, by changing the timing at which the gate 16 is set to the first position, the position of the sheet to be bitten into the nip portion of the second and third rollers 11 and 12 can be changed, so the sheet folding position can be changed arbitrarily.

Note that the fourth and fifth rollers 14 and 15 may be kept apart at all times and pressed against each other when the gate 16 is swung to the first position to reversely feed the paper 20.

Effects of the Invention By setting the gate 16 to the second position, the paper 20 fed into the nip portion of the first and second rollers 10 and 11 of the roller mechanism is transferred to the fourth and fifth rollers 14 and 1.
5, for example, the trailing edge 2 of the paper 20.
After the sheet 0b has passed through the nip portion, the sensor detects the leading edge 20a of the sheet 20. Based on the signal, the gate 16 is moved to the first position, and the fourth and fifth rollers 14 and 15 are driven. By applying a conveying force to the paper 20 toward the roller mechanism, the paper 20 is reversely fed by the fourth and fifth rollers 14 and 15, and the trailing edge 20b of the paper 20 is passed through the gate 16.
The paper 20 can be fed into the nip portion of the second and third rollers 11 and 12 using the guide as a guide, and the paper 20 can be reversed and discharged.

Therefore, the paper 20 that has passed through the nip portions of the first and second rollers 10 and 11 is transferred to the fourth and fifth rollers 1.
4 and 15 to ensure that the trailing edge 20b is fed into the nip portion of the second and third rollers 11 and 12, and even paper that is weak or curled can be reliably reversed without jamming. Can be discharged.

Further, the gate 1 is controlled by the timing of driving the fourth and fifth rollers 14 and 15 after the sensor detects the leading edge 20a of the paper and by the solenoid 17.
Since the timing at which the roller 6 is moved from the second position to the first position can be changed arbitrarily, the paper 20 can be moved between the nip portions of the first and second rollers 10 and 11 and the nip portions of the fourth and fifth rollers 14 and 15. If the gate 16 is moved from the second position to the first position and the third and fourth rollers 14 and 15 are driven in the state where the paper 20 is conveyed, the second and third rollers 11, Not only can it be fed into the nip section of 12, folded in two and discharged, but the timing of moving the gate 16 from the second position to the first position by the solenoid 17 and the timing of driving the fourth and fifth rollers 14 and 15 can be set arbitrarily. By changing this, the folding position of the paper 20 can be changed.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the conventional example, Figs. 2 and 3 are illustrations of folding and reversing operations, Fig. 4 is an overall explanatory view of the embodiment of the present invention, and Figs. 5 and 6 are during inversion. FIGS. 7 and 8 are explanatory diagrams of the operation during folding. 10, 11, 12 are first, second, third rollers,
14 and 15 are fourth and fifth rollers, 16 is a gate,
18 is a paper detector, and 20 is paper.

Claims (1)

[Claims] 1. The first roll 10 and the second roll 11 are brought into pressure contact, and the third roll 12 is brought into contact with the second roll 11, and the paper 20 is fed through the nip section between the first roll 10 and the second roll 11, and the paper 20 is 20 from the nip portion of the second roll 11 and the third roll 12, and
0 and the delivery side of the nip part of the second roll 11,
Fourth and fifth rollers 14 and 15 are provided to apply a conveying force to the paper 20 toward the roller mechanism, and
The paper 20 is placed on the transport path of the paper 20 on the delivery side from the nip portion of the first roll 10 and the second roll 11.
A sensor is provided to detect the tip edge 20a of the
A gate 16 is provided between the nip portion of the first and second rolls 10 and 11 and the third and fourth rolls 14 and 15.
is separated from the paper 20 and allows the paper 20 to be conveyed from the nip portions of the first and second rolls 10 and 11 toward the third and fourth rolls 14 and 15; , and a first position where the paper is fed toward the nip portion of the third rolls 11 and 12, by a solenoid 17, and the solenoid 17 is operated based on a detection signal of the leading edge 20a of the paper from the sensor. controlling the gate 16 to the second
the fourth and fifth rollers 14 and 15 based on the detection signal of the paper leading edge 20a of the sensor so as to apply a conveying force to the paper 20 toward the roller mechanism. A sheet reversing/folding apparatus characterized in that the solenoid 17 and the operation control timing of the fourth and fifth rollers 14 and 15 can be changed arbitrarily.