JP2530698Y2 - Paper reversing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a sheet reversing device that enables a sheet conveyed in a sheet conveying path to be turned upside down. The driving direction of the reversing roller device provided on the chute is switched, and the reversing roller device provided on the chute can be driven only when the guiding direction by the gate is switched to the position for guiding the paper toward the invert chute. To a sheet reversing device.

2. Description of the Related Art Conventionally, in an automatic double-sided copying machine, a mechanism for reversing a single-sided copied sheet in the middle of a sheet conveying path, storing the sheet in an intermediate tray, and sending the sheet again toward a toner image transfer portion. In many cases, the paper transport device is used. When a reversing device having a similar mechanism is connected to a copying machine and a sorter is provided, it may be necessary to reverse and feed the reversal according to the characteristics of the sorter. In such an apparatus, an invert chute having a configuration as shown in FIG. 4 is generally used. In this invert chute, a reversing roller device 33 is provided inside the chute 32.

The three-roller device 31 provided at the entrance of the chute 32 is composed of a driving roller 35 at the center and driven rollers 36 and 37 disposed on both sides of the roller 35. Then, the paper is introduced into the chute 32 through the nip formed by the rollers 35 and 37, and the paper in the chute 32 is discharged through the nip formed by the rollers 35 and 36. Have been. Further, a reversing roller device 33 provided in the middle of the chute 32 carries in the paper introduced into the invert chute 32 from the entrance via the three-roller device 31, and thereafter, the roller device 33 Drive in the opposite direction,
The paper can be fed toward the paper transport path via a nip portion formed by 35 and 36.

(Problems to be Solved by the Invention) In the conventional device as described above, the reversing roller device is always rotated in either direction,
Even when the sheet is not reversed through the invert chute, the reversing roller in the invert chute is in a driven state. Therefore, since the holding portion always contacts the reversing roller and the nip roller, problems such as increased abrasion of the rollers, abrasion at the friction conducting portion, and noise are liable to occur.

In order to solve the above-mentioned problems, it is most appropriate to configure the reversing roller device to be driven by a single motor and to drive the reversing roller only when necessary. However, in the case of the above-described configuration, problems occur in the space and cost of the main body of the copying machine, the responsiveness of the transport device, and the like.

(Purpose of the Invention) The present invention solves the above-mentioned drawbacks of the conventionally used apparatus. A gate provided at an introduction portion of the invert chute is provided at a position where the paper is guided toward the invert chute. Only when it is operated, the reversing roller device is driven to perform reversal discharge of the sheet, and when the gate is positioned at a position where the sheet is not introduced into the chute, the reversing roller device is driven. It is an object of the present invention to provide an apparatus configured not to perform the above.

(Means and Actions for Solving the Problems) The present invention provides an invert chute that branches from the middle of the paper transport path, arranges a gate at a branch point to the invert chute, and inverts the paper in the paper transport path. The present invention relates to an apparatus having means for switching a sheet conveying direction so as to perform an operation of sending out a sheet without using it and an operation of inverting and sending out a sheet inserted into an invert chute. In the present invention, a reversing roller device composed of a roller arranged to face the invert chute so as to sandwich a sheet is provided, and a reversing pulley is provided on a shaft of the reversing roller device to correspond to the invert chute. By providing a pair of drive rollers that are rotated in opposite directions to each other, a driven pulley that transmits driving force between a reversing pulley and a driving roller provided on the shaft of the reversing roller,
When the gate is in a position to guide a sheet without using an inverting chute in conjunction with the moving means for making contact with one of the two drive rollers and the gate, the operation by the moving means is restricted. Holding means for holding the driven pulley at a position not in contact with any of the drive rollers.

Therefore, in the apparatus of the present invention, the driving of the reversing roller is performed only when reversing the sheet.
Unnecessary rotation of the roller device or the like is prevented, thereby making it possible to prevent an undesirable state such as abrasion of the roller or the like and generation of noise.

(Embodiment) The configuration of the sheet reversing device of the present invention will be described according to the illustrated embodiment.

As shown in FIG. 1, the paper reversing device 1 of the present invention
In the figure, an invert chute 5 is disposed in the middle of the paper transport path with respect to the paper transport path 3, and a gate 10 is disposed in a connection portion with the invert chute 5.
In the apparatus of the present invention, the guide surface of the gate 10 can form an insertion path 6 for introducing a sheet from the sheet transport path 3 to the invert chute 5 and a discharge path 7 from the invert chute 5. It has become.

The invert chute 5 of the present invention is provided with a reversing roller device 25 in the middle thereof in the same manner as a conventionally used chute, and this reversing roller device 25 is connected to a reversing roller as shown in FIG. 26 and a nip roller 27. In the case of a conventional inverter chute, the roller in the reversing roller device is generally a corrugation roller device formed by combining a roller provided with flanges on both sides and a normal type roller. In the case of the apparatus described above, a normal type roller apparatus having no flange is used without using the above-described apparatus.

The rollers are supported by shafts 26a and 27a, respectively.A reversing pulley 24 is provided at an end of the reversing roller shaft 26a, and rotation of the reversing pulley 24 is transmitted by a reversing roller driving device 20 as described later. By doing so, the sheet is transported in both the direction of insertion into the invert chute 5 and the direction of discharge. The nip roller 27 disposed opposite to the reversing roller 26 is applied with a constant pressing force by a spring or the like via a shaft support mechanism (not shown), and a nip pressure of a predetermined value is applied between the two rollers. It is arranged to be obtained. Then, with respect to the sheet nipped between the rollers, the rollers can be driven in the forward and reverse directions, that is, the direction in which the sheet is taken into the chute and the direction in which the sheet is ejected from the chute. Can be performed normally.

The gate 10 provided at the branch portion between the paper transport path and the invert chute of the present invention is supported by the gate shaft 11, and the position where the gate 10 protrudes toward the paper transport path, It is configured to be able to swing between a position where the chute entrance is closed. An arm 12 is fixed to a shaft 11 of the gate 10, and a link 13 provided with a locking means 13a at a lower portion is supported on the arm 12. The link 13 moves up and down following the swinging of the gate 10, but the locking means 13a provided below the link 13 is arranged below the solenoid 15 of the reversing roller driving device 20. When the solenoid 15 is in the off state, the engaging member 14 provided on the arm 16 is locked, so that the arm 16 can be prevented from descending by the force of the spring 18.

Therefore, in the reversing roller driving device 20 of the present invention, the reversing roller driving device is kept in a non-driving state when the gate 10 is set at the position where the sheet is directly fed (the position where the sheet is not guided to the invert chute 5). Is done. Further, in the present invention, only when the gate is set at a position where the sheet is guided to the invert chute 5, the reversing roller driving device 20 can perform the operation of conveying the sheet.

As shown in FIG. 1, the reversing roller driving device 20 of the present invention brings the driven pulley 23 into contact with two oppositely driven driving rollers 21 and 22 inside the copying machine main body.
The driven pulley 23 is in contact with a reversing pulley 24 provided on the reversing roller so that the driving force can be transmitted. The detailed mechanism of the reversing roller driving device 20 is as follows.
It is configured as shown in the figure. In the illustrated embodiment, the shaft of the driven pulley 23 is supported via the link 17 with respect to the shaft of the reversing pulley 24, and the driven pulley 23 is pressed by one of the two drive rollers 21 and 22. Such an operation is performed.

As a swinging means of the driven pulley 23, an inversion solenoid 15 is used, and an arm 16 of the inversion solenoid 15 is used.
A shaft of a driven pulley 23 is supported, and a spring 18 is provided on a link 17 that supports the shafts of the driven pulley and the reversing pulley, respectively.When the solenoid 15 is in an off state, the spring 18 The driven pulley 23 is set to be pressed toward the drive roller 22. However, in the device of the present invention, as shown in FIG. 1, the engaging member 14 is located at a predetermined position of the operating shaft of the reversing solenoid 15.
And the engaging member 14 is the locking member 13 of the link 13.
It is configured to be engaged with a. Therefore, in the device of the present invention, the gate 10 is swung, and the gate 10 is swung.
Is set to the position B, whereby the driven pulley 23 is moved by the spring 18 to the position where it contacts the drive roller 22 only when the link 13 is lowered via the arm 12 as shown by the dashed line. Becomes

That is, when the gate 10 is set at the position A and the link 13 is at the position shown by the solid line in the figure, the reversing solenoid 15 is turned off, and even if the link 17 is pulled by the spring 18, Since the joining member 14 is locked by the holding member 13a, the arm 16 does not descend, and therefore the driven pulley 23 does not come into contact with the drive roller 22. Only when the gate 10 is set at the position B where the paper is introduced into the invert chute 5, the reversing pulley 24 is driven by the drive roller 22 in the direction of drawing the paper, and the paper introduced from the paper transport path is inverted. Carry in.

When a predetermined time elapses according to the length of the sheet after the reversing roller starts the operation of loading the sheet, and the rear end of the sheet is introduced into the invert chute, the reversing solenoid is used. 15 turns on, driven pulley
The sheet 23 is raised and brought into contact with the driving roller 21, the reversing roller is rotated in reverse by the driving roller 21, and the sheet is inverted and discharged from the invert chute 5 to the sheet conveying path through the discharge path 7. . As described above, after discharging the paper, the gate 10 is returned to the original position to open the paper conveyance path, and at the same time, the reversing solenoid 15 is turned off, but the link 13 is in the raised position. Therefore, the driven pulley 23 is stopped at an intermediate position between the driving rollers 21 and 22, and is stopped so as not to rotate the reversing roller. Further, the paper reversing device of the present invention can perform the reversing operation favorably when used for reversing one-sided copied paper in an automatic duplex copying machine. It can be simplified.

Note that the paper reversing device of the present invention is not limited to being provided in the automatic document feeder as described above. In addition, the paper reversing device is provided on a paper transport path for reversing a copy and discharging the copy to a sorter. For example, it can be used for reversing a sheet in a sheet conveying path of a general copying machine and for reversing a sheet in a sheet handling device other than the copying machine.

(Effect of the Invention) Since the paper reversing device of the present invention has the above-described configuration, by providing drive switching means for the reversing roller device in the invert chute,
Since the driving direction can be easily set,
The drive mechanism of the reversing roller device can be simplified. Also, in the paper reversing device of the present invention, the reversing roller driving device is regulated by the gate driving device, so that the reversing roller device of the reversing roller driving device is driven only when paper is introduced into the invert chute. It is. Therefore, when the gate is positioned so that the sheet is directly discharged, the extra drive of the reversing roller device is not performed, and the abrasion of the roller members and the occurrence of the drive due to the rotation are reduced. Can be done.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing the configuration of a paper reversing device of the present invention, FIG. 2 is an explanatory diagram of a driving mechanism of the present invention, FIG. 3 is a plan view of a reversing roller device, FIG. FIG. 1 is an explanatory diagram showing a configuration of a conventional invert chute. Reference numeral 1 in the drawing: paper reversing device, 3: paper transport path, 5: invert chute, 6: insertion path, 7: discharge path, 10: gate, 11: gate shaft, 12 ... Arm, 13 ... link,
13a: locking portion, 15: reversing solenoid, 16: arm, 17: link, 18: spring, 20: reversing roller driving device, 21/22: driving roller, 23: driven pulley , 24 ... reversing pulley, 25 ... reversing roller device, 26 ...
Reversing roller, 27 ... Nip roller.

Claims (1)

(57) [Scope of request for utility model registration] 1. An invert chute that branches from the middle of a paper transport path, a gate is disposed at a branch point with respect to the invert chute, and the sheet is fed out without using the invert chute in the paper transport path, and inserted into the invert chute. A means for switching the sheet conveyance direction so as to perform a function of inverting and sending out the set sheet, comprising a roller arranged to face the invert chute so as to sandwich the sheet. Providing a reversing roller device, providing a reversing pulley on the shaft of the reversing roller device, providing a pair of drive rollers that are rotated in opposite directions to each other in correspondence with the invert chute, and a reversing pulley provided on the shaft of the reversing roller. A driven pulley for transmitting a driving force between the driving rollers is connected to one of the two driving rollers. When the gate is in a position to guide the paper without using an inverting chute in conjunction with the moving means to be brought into contact with the gate, the operation by the moving means is regulated to move the driven pulley to any of the driving rollers. And a holding means for holding the sheet at a position where the sheet is not in contact with the sheet.