JP2007302383A - Paper folding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably provide paper restriction positions and reduce an overall noise generated from a paper folding device including impact noise caused when paper collides with a stopper. <P>SOLUTION: This paper folding device comprises a paper feed roller 3, a buckle 5a having a position-adjustable position restriction stopper 6a for restricting the conveyed-in paper, and a pair of rollers 4a to 4e for pressingly holding forward the top part of the paper deflected at the entrance of the buckle 5a by the position restriction stopper 6a, and folding and feeding the paper. A paper detector 8a is installed on the entrance side of the buckle 5a apart a predetermined distance from the position restriction stopper 6a. The rotational speeds of the rollers 3, 4a to 4e for feeding paper when the paper detector 8a detects the paper are temporarily reduced, and when the speed of the paper is minimized, the head of the paper conveyed in is brought into contact with the position restriction stopper 6a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a paper folding apparatus.

  Insert the leading edge of one sheet sent out from the paper feeder into a buckle with a stopper positioned corresponding to the folding position of the sheet, and place the top two bending top positions of the sheet bent by the buckle. A paper folding apparatus that feeds between a pair of rollers and folds by pressing between the rollers is well known. Such a paper folding apparatus normally performs folding operation of 100 sheets or more per minute. In this case, each paper collides with the stopper at a speed of 900 mm / second. At this time, the collision sound and the sound that the paper bends in the buckle and hits the inner wall surface of the buckle and the folding sound are regarded as problems in the environment such as an office.

As a means for reducing this noise, there is a method in which an elastic member for reducing the impact of a collision is attached to the front surface of the stopper (Patent Document 1), or a position restricting stopper and a slide stopper having an elastic effect are combined (Patent Document 2). is there.
JP-A-11-106127 JP 2004-345773 A

  However, with the conventional means for reducing noise, the impact noise is mitigated, but the sound that the paper bends in the buckle and hits the inner wall of the buckle and the biting sound of the roller when it is folded cannot be reduced. There is a problem that the restriction position of the paper is likely to vary due to a problem that the sheet is high and a displacement of the elastic member and the astringent movement of the slide stopper.

  The problem to be solved by the present invention is that the regulation position of the paper can be stably obtained, and not only the collision sound when the paper collides with the stopper, but also the sound that the paper is bent in the buckle and hits the inner wall surface of the buckle. It is possible to reduce the overall noise generated by the paper folding device, such as the biting sound of the rollers when folding, and to solve such problems.

  According to the present invention, a paper feed roller, a buckle having a position-adjustable position regulating stopper that regulates the leading end position of the paper to be carried in, and the top position of the paper that is bent at the carry-in port of the buckle by the position regulating stopper are pinched at the head. A sheet detector that detects a sheet carried into the buckle at a position spaced a predetermined distance from the position restricting stopper toward the carry-in side of the buckle. When the paper detector detects the paper, the rotational speed of each roller is temporarily reduced based on the detection signal, and the leading edge of the paper that is carried in when the paper transport speed is reduced is used as the position regulating stopper. The main feature is that they come into contact with each other.

  In the present invention, a paper detector is disposed on the buckle carry-in entrance side at a predetermined distance from the position regulating stopper provided on the buckle, and when the paper detector detects the paper, the rotational speed of the roller for feeding the paper is temporarily set. When the paper is decelerated and the paper feed speed reaches its minimum, the leading edge of the paper to be brought into contact with the position restriction stopper, the collision noise between the paper and the position restriction stopper can be greatly reduced, and the rotation speed of the roller Due to the reduction of the sheet conveyance speed, the sound of the sheet being bent in the buckle and hitting the inner wall surface of the buckle and the noise of biting the roller when folded are greatly reduced. Further, since the leading edge of the sheet directly contacts the position restriction stopper, it can be always regulated to a stable position.

  Paper that can stably obtain the regulated position of the paper, and not only the collision sound when the paper collides with the stopper, but also the sound that the paper bends in the buckle and hits the inner wall of the buckle, and the biting sound of the roller when folded For the purpose of reducing the overall noise generated by the folding device, a paper detector for detecting paper carried into the buckle is provided on the carry-in side of the buckle at a predetermined distance from the position regulating stopper. When the paper detector detects the paper, the rotational speed of each roller that feeds the paper is temporarily reduced, and the leading edge of the paper to be brought into contact with the position restriction stopper when the paper speed becomes the minimum. It was realized.

Embodiments according to the present invention will be described below with reference to the drawings. FIG. 1 is a side view of the paper folding apparatus according to the embodiment, and FIG. 2 is an enlarged side view of the buckle portion shown in FIG. 1 and 2, 1 is a paper feed table, 2 is a paper feed roller, 3 is a feed roller, 4a to 4e are folding rollers, 5a is a first buckle, 5b is a second buckle, and 6a and 6b are position restriction stoppers. 7a and 7b are stopper moving belts, 8a and 8b are sheet detectors, 9 is a discharge belt, 10 is a discharge roller, 11 is a discharge tray, and P is a sheet.

The stopper moving belt 7a moves along the first buckle 5a, and a position regulating stopper 6a that regulates the leading end position of the paper carried into the first buckle 5a by the stopper moving belt 7a and the paper carried into the first buckle 5a. A paper detector 8a for detecting the leading end is fixed, and the paper detector 8a is located on the carry-in side of the first buckle 5a, which is separated from the position regulating stopper 6a by a predetermined distance. The stopper moving belt 7b moves along the second buckle 5b, and a position regulating stopper 6b that regulates the leading end position of the paper that is carried into the second buckle 5b and the paper that is carried into the second buckle 5b. A paper detector 8b for detecting the leading end is fixed, and the paper detector 8b is positioned on the carry-in side of the second buckle 5b spaced from the position restricting stopper 6b by a predetermined distance.

The positions of the position restricting stoppers 6a and 6b are determined according to the position where the paper P is folded. For example, if the paper P is folded at two positions where the paper P is equally divided, 2/3 of the paper P is carried into the first buckle 5a, and the stopper moving belt 7a is moved to a position corresponding to 2/3. Is positioned. Since half of the paper P folded at one place is carried into the second buckle 5b, the stopper moving belt 7b is moved to a position corresponding to the half of the paper P and positioned.

After this positioning, the uppermost sheet P stacked on the sheet feed table 1 is fed between the feed roller 3 and the folding roller 4a by the sheet feed roller 2, and the leading end of the delivered sheet P is Then, it is carried into the first buckle 5a through the folding rollers 4a and 4b. The leading edge of the paper P comes into contact with the position regulating stopper 6a, and the leading edge of the paper P stops. At this time, the rear 1/3 of the sheet P is sandwiched between the folding rollers 4a and 4b, and the feeding of the sheet P is continued by the folding rollers 4a and 4b. By this sending, the paper P is bent at the carry-in port of the first buckle 5a, and is sent out between the folding rollers 4b and 4c with the top of the bending as the tip, whereby one place of the paper P is folded.

Although it can be discharged by this folding, in the case of further folding, it is sent between the folding rollers 4c and 4d with the folding portion at the tip and carried into the second buckle 5b. The leading edge of the paper P with the folded portion at the leading edge comes into contact with the position regulating stopper 6b, and the leading edge of the paper P stops. At this time, the rear 1/3 of the sheet P is sandwiched between the folding rollers 4b and 4c, and the sheet P is continuously fed by the folding rollers 4b and 4c. By this feeding, the sheet P is bent at the carry-in port of the second buckle 5b, and is fed between the folding rollers 4d and 4e with the top of the bending as the leading end. As a result, the second portion of the sheet P is folded, and the discharge belt 9 Are discharged to the tray 11 by the discharge roller 10. As described above, this folding operation is normally performed 100 sheets or more per minute.

In this embodiment, the sheet detector for detecting the leading edge of the paper carried into each of the buckles 5a and 5b before the leading edge of the paper carried into the first buckle 5a and the second buckle 5b contacts the position regulating stoppers 6a and 6b. 8a and 8b are arranged, and when the paper detectors 8a and 8b detect the leading edge of the paper, the detection signals are sent to the motors for driving the feed roller 3 and the folding rollers 4a to 4e (one motor is used for these rollers). To the control circuit that controls the speed. When this detection signal is input, the control circuit outputs a deceleration signal to the motor drive circuit for a predetermined time as shown in FIGS. 3 and 4, and the rotation of the motor, that is, the rotation of each roller is smoothed by the signal. Then, the rotation of each roller smoothly returns to the original speed as the deceleration signal is released after a predetermined time has elapsed. When the rotation of each roller is decelerated most, the leading edge of the paper P carried into the buckle comes into contact with the position restriction stoppers 6a and 6b. That is, the predetermined time for outputting the deceleration signal is a time set so that the rotation of the motor is completed for deceleration immediately before the sheet collides with the stopper of the buckle.

As described above, since the sheet conveyance speed is reduced before the leading edge of the sheet contacts the position restriction stoppers 6a and 6b, the number of folding processes per time is reduced by that amount, but the conveyance speed can be increased as compared with the conventional technique. As a result, reduction in the number of folding processes can be avoided.

In the embodiment, the paper detector is linked with the position restriction stopper so that the same distance is maintained regardless of the position of the position restriction stopper. However, when the position restriction stopper is moved by a motor. Since the position of the position restricting stopper is determined in advance by a program, the paper detector is fixed and the number of rotations of the roller is detected or the amount of paper transport from the paper detector is calculated by time. You may make it decelerate by a result.

It is a side view of the paper folding apparatus which concerns on the Example of this invention. It is a side view which expands and shows the buckle part of the paper folding apparatus shown in FIG. It is a timing chart of folding operation | movement of the paper folding apparatus shown in FIG. It is a flowchart of folding operation | movement of the paper folding apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paper feed stand 2 Paper feed roller 3 Feed roller 4a-4e Folding roller 5a 1st buckle 5b 2nd buckle 6a, 6b Position control stopper 7a, 7b Stopper moving belt 8a, 8b Paper detector 9 Discharge belt 10 Discharge roller 11 Discharge tray

Claims (2)

A sheet feed roller, a buckle having a position-regulating position regulating stopper that regulates the leading end position of the sheet to be carried in, and a top position of the sheet that is bent at the carry-in entrance of the buckle by the position regulating stopper is clamped to the top and fed out 2 In the paper folding apparatus provided with a pair of rollers, a paper detector for detecting paper carried into the buckle is provided at a predetermined distance from the position regulating stopper toward the carry-in side of the buckle, and the paper When the detector detects the paper, the rotational speed of each roller is temporarily reduced based on the detection signal, and the leading edge of the paper to be brought in contact with the position restriction stopper when the paper transport speed is reduced. A paper folding device characterized by that. 2. The paper folding apparatus according to claim 1, wherein the paper detector is interlocked with the position restriction stopper at a predetermined distance.

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