JPH0524651U - Paper reversing device - Google Patents

Abstract

(57) [Abstract] [Purpose] In a paper reversing device that reverses paper in the process of switching back and sending out sheet-like paper on the vertical transport path in the vertical direction, it eliminates skew and is advantageous in terms of space and cost. To provide a sheet reversing device. [Structure] A pair of conveying rollers 3a, 3 provided on a vertical conveying path
b, a pair of return rollers 4 and 11 provided on the vertical conveyance path below the conveyance roller for returning the sheet conveyed downward by the conveyance roller to the upper side, and the return roller on the vertical conveyance path. A pressing member 8 provided below the rollers for pressing and fixing the lower end portion of the sheet conveyed downward, and a slack portion of the sheet formed between the pressing member and the return roller on the vertical conveyance path to escape. Opening 1
Must have 00.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sheet reversing device, and more particularly, to a sheet reversing device applicable to a copying machine, a printer, a fax machine and the like.

[0002]

[Prior Art]

 There is a technique shown in FIG. 7 as a sheet reversing device for reversing a sheet in the process of switching back and feeding the sheet of paper on a vertical conveying path in the vertical direction.

This sheet reversing device includes a pair of conveying rollers 2000 and 3000 that conveys the sheet S downward to a vertical conveying path 1000 that conveys the sheet S in the vertical direction, and a return roller unit 5000 that can be reversed below the conveying rollers 2000 and 3000. The sheet S is conveyed downward in the vertical conveyance path 1000 by the conveyance rollers 2000 and 3000 and the return rollers 9000 and 1500 of the return roller unit 5000, and is returned after the upper end of the sheet passes the branching section 4000. The roller 9000 is reversely rotated in the direction of arrow A to reversely convey it, and the sheet S is provided with the branching section 4000 and is branched by the branching claw that is switched to the rotation position shown by the chain double-dashed line. It is guided to 7000 and discharged by the conveying force of the conveying rollers 2000 and 8000.

Further, there is a technique shown in FIG. 8 as a sheet reversing device for reversing a sheet in the process of switch-cutting a cut sheet-like sheet on a vertical conveying path in the vertical direction and sending it out. In this paper reversing device, the paper S is fed from the entrance 1800 while the branch claw 6000 and the contact / separation roller 1700 are retracted from the conveyance path in advance as indicated by the solid line.

After the upper end of the sheet has passed through the nip portion of the transport rollers 2000 and 3000, after a predetermined time has elapsed, the contact / separation roller 1700 makes contact with the return roller 1500 that is normally rotating, and the sheet S that falls by its own weight At the same time, the branch claw 6000 is switched to the position shown by the chain double-dashed line. Therefore, the sheet S is turned over and exits from the exit 1900.

[0006]

[Problems to be solved by the device]

 In the above-mentioned conventional technique, since a roller capable of rotating in the forward and reverse directions is used, there is a problem that it requires a space and becomes expensive.

In the above-mentioned conventional technique, since the rotation direction of the roller is not switched during the operation, the problem in the above-mentioned conventional technique is solved, but since the process includes the step of free-falling the paper for a moment, this free-fall At this time, the paper becomes skewed due to the difference in resistance on the surface of the guide member, etc., and this condition is not corrected until the time of reversal paper ejection, which causes jams and stack misalignment.

Therefore, an object of the present invention is to provide a sheet reversing device which eliminates skew and is advantageous in terms of space and cost.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, a pair of conveying rollers provided on a vertical conveying path, and a sheet provided below the conveying rollers on the vertical conveying path and conveyed downward by the conveying rollers are returned upward. A pair of return rollers that can be brought into contact with and separated from each other, a holding member that is provided below the return roller on the vertical conveyance path and presses and fixes the lower end portion of the sheet conveyed downward, and the pressing member and the return roller on the vertical conveyance path. It is decided to have an opening for letting out the slack part of the paper that can be created between the sheets.

Further, a pair of conveying rollers provided on the vertical conveying path and a pair of return rollers which are provided below the conveying rollers on the vertical conveying path and which return the sheet conveyed downward by the conveying rollers to the upper side. A roller, a horizontal bottom portion provided below the return roller on the vertical conveyance path and in contact with the lower end of the sheet, and an opening for slackening the sheet formed between the bottom portion on the vertical conveyance path and the return roller. It is also possible to adopt a configuration having a part.

[0011]

[Action]

 The trailing edge of the paper is pressed by the pressing member, and there is no moment when the paper falls freely, and it is not necessary to switch the roller between forward and reverse rotation.

[0012]

【Example】

 1. Embodiment corresponding to claim 1 (see FIGS. 1 to 5) First, the configuration will be described. In FIG. 1, reference numerals 3a and 3b denote a pair of conveyance rollers provided at the lower end portions of the guides 1a and 1b on the sheet entrance side, and are always rotating in the direction of feeding the sheet downward.

Below the pair of conveying rollers, a pair of return rollers 4 and 11 for returning the paper S upward is provided.

Guides 12 a and 12 b on the sheet exit side are provided between the conveying rollers 3 a and 3 b and the return rollers 4 and 11. The return roller 4 is movable in and out of contact with the return roller 4 whose position does not change, and is rotatably provided on the upper end of a lever 5 which swings around the fulcrum 2. The other end of the lever 5 is connected to a solenoid 9, and when the solenoid 9 is turned on, the return roller 4 comes into contact with the return roller 11 and when the solenoid 9 is turned off, the return roller 4 is separated to open the conveyance path. ..

Guides 6a and 6b are provided below the return rollers 4 and 11, and a window 6b1 is formed in a part of the guide 6b. A pressing member that goes in and out of the vertical conveyance path through the window. There is 8. The holding member 8 is pivotally attached to the lower end of a lever 21 supported by a fulcrum 20, and specifically, as shown in FIG. 5, the leading end of the holding member 8 facilitates fixing of paper. Is provided with a tip member 8a made of a high friction elastic member such as rubber.

When the solenoid 19 is turned on, the lever 21 is rotated to bring the leading end member 18a into close contact with the guide 6a and fix the paper, if any. If it is off, the pressing member 8 is pulled by the spring and retracts to the outside of the guide 6b.

An opening 100 is formed between the return roller 11 and the pressing member 8. This opening portion 100 is for letting out a slack portion of the sheet as described later.

Further, a sensor 10 that emits a signal for controlling the time when the solenoid 9 is turned on, that is, the timing of bringing the return roller 4 into contact with the return roller 11 is arranged immediately before the transport roller 3b. .. The sensor 7 is also provided at the facing portion of the pressing member 8, and this sensor is for controlling the time when the solenoid 19 is activated, that is, the time when the pressing member 8 is pressed. All of these sensors detect the passage of the leading edge or the trailing edge of the sheet, and a detection signal equivalent to the detection signal of the sensor 7 can be obtained from the detection signal of the sensor 10 and the speed of the sheet. In that case, the sensor 7 is not necessary, and the sensor 10 also has that function.

In the above description, all of the guides 1a, 1b, 6a, 6b, 12a, 12b, etc. are oriented in the vertical direction, and all form a vertical transport path.

Next, the operation of reversing the paper will be described. As shown in FIG. 1, the paper S sent from between the guides 1a and 1b is sent downward by the carrying rollers 3a and 3b, guided further by the lever 5 and sent further below the guides 6a and 6b. Go to.

After the leading edge of the sheet S has passed the sensor 7 and T ₁ pulse has passed, the lower end of the sheet S has sufficiently passed the pressing member 8, and then the pressing member 8 is moved to the leading edge of the sheet S as shown in FIG. Is pressed against the guide 6a to fix the inside of the leading edge of the paper. Along with this, the central portion and the rear end portion of the sheet fed by the transport rollers 3a and 3b swell into the opening 100 and escape.

Then, as shown in FIG. 3, when the trailing edge of the sheet S passes through the sensor 10 and after T ₂ pulse, the trailing edge of the sheet passes through the nip portion of the transport roller 3a3, the solenoid 9 is activated. When the return roller 4 is turned on, the return roller 4 is pressed against the return roller 11 that is normally rotating in the feeding direction, and the upper end of the sheet S is positioned between the guide plates 12a and 12b on the exit side.

As a result, the return rollers 4 and 11 feed the sheet between the guide plates 12a and 12b, so that the swelling due to the slack in the center of the sheet, which occurs in FIG. 2, is gradually reduced, and in this process the solenoid 8 Is turned off, and as shown in FIG. 4, the lower end of the sheet S becomes free, and is fed while being reversed.

In this example, since the sheet is fixed by the pressing member 8, there is no skew, and jams and stack misalignment are eliminated. Further, since the return roller 11 is normally rotated in one direction and a forward / reverse rotation mechanism is unnecessary, it does not take up a space and is advantageous in cost.

2. Example corresponding to claim 2 (see FIG. 6) In this example, as shown in FIG. 6, the pressing member 8 and the sensor 7 in the example 1 are omitted, and the guides 6a and 6b are provided with a horizontal bottom portion 101. Is.

In the present example, the lower end of the paper S is pressed by the pressing member 8 in the above example, but instead, the lower end is brought into contact with the bottom 101. The slack of the paper accompanying this is released from the opening 100. Others are the same as in Example 1 above.

In the present example, in order to secure the conveyance of the paper, the distance l from the contact portion between the return rollers 11 and 4 to the bottom 101 is the smallest size among the papers of various sizes used in the paper reversing device. It should be set smaller than the length of the paper in the transport direction.

Note that the same thing can be said in the first example, and in the first example, the distance from the contact portion of the return rollers 11 and 4 to the pressing member 8 is used in the sheet reversing device. It should be set smaller than the length of the smallest size paper in the transport direction.

[0029]

[Effect of the device]

 According to the present invention, it is possible to provide a sheet reversing device that eliminates skew and is advantageous in terms of space and cost.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a reversing process of a paper reversing device according to the present invention.

FIG. 2 is a diagram illustrating a reversing process of the paper reversing device according to the present invention.

FIG. 3 is a diagram illustrating a reversing process of the sheet reversing device according to the present invention.

FIG. 4 is a diagram illustrating a reversing process of the paper reversing device according to the present invention.

FIG. 5 is a perspective view of a pressing member of the paper reversing device according to the present invention.

FIG. 6 is a diagram illustrating another configuration example of the sheet reversing device according to the present invention.

FIG. 7 is a diagram illustrating a configuration of a conventional sheet reversing device.

FIG. 8 is a diagram illustrating the configuration of another conventional sheet reversing device.

[Explanation of symbols]

 3a Conveyor Roller 3b Conveyor Roller 4 Return Roller 8 Holding Member 11 Return Roller 100 Opening 101 Bottom

Claims (2)

[Scope of utility model registration request] 1. A sheet reversing device for reversing a sheet in the process of switching back and feeding a sheet of paper on a vertical conveying path in the vertical direction, wherein a pair of conveying rollers provided on the vertical conveying path, and a pair of conveying rollers on the vertical conveying path. A pair of return rollers, which are provided below the conveying rollers and can return the sheet conveyed downward by the conveying rollers to the upper side, and a pair of return rollers which are provided below the returning rollers on the vertical conveying path and convey downward. A sheet reversing device having a pressing member for pressing and fixing the lower end of the formed sheet, and an opening for allowing a slack portion of the sheet formed between the pressing member and the return roller on the vertical conveyance path to escape. . 2. A sheet reversing device for reversing a sheet of paper in a process of switching back and feeding the sheet up and down on a vertical conveyance path, wherein a pair of conveyance rollers provided on the vertical conveyance path and the vertical conveyance path. A pair of return rollers, which are provided below the conveying rollers and can return the sheet conveyed downward by the conveying rollers to the upper side, and a pair of return rollers, which are provided below the returning rollers on the vertical conveying path, contact a lower end of the sheet. A sheet reversing device having a horizontal bottom portion in contact with the bottom portion and an opening for letting out a slack portion of the sheet formed between the bottom portion on the vertical conveyance path and the return roller.