Perforation device and sheet post-processing device provided therewith

Patent metadata

Field	Value
Publication number	US-11952233-B2
Application number	US-202117553444-A
Country	US
Kind code	B2
Filing date	Dec 16, 2021
Priority date	Dec 24, 2020
Publication date	Apr 9, 2024
Grant date	Apr 9, 2024

Abstract

A perforation device includes a shaft, a perforation motor, at least a first perforation portion, at least a second perforation portion, at least a first cam for reciprocating a first perforation blade in the first perforation portion, at least a second cam for reciprocating a second perforation blade in the second perforation portion, a rotation speed detecting portion, a home position detecting portion, and a controller. In second perforation processing in which the shaft is rotated one turn to perform first perforation with the first perforation portion and second perforation with the second perforation portion in sequence, the controller senses, with the rotation speed detecting portion, the rotation speed of the shaft after the first perforation blade penetrates the sheet in the first perforation and, based on the rotation speed detecting, the controller determines the timing of starting braking control in the second perforation and performs braking control.

First claim

What is claimed is:

1. A perforation device comprising:
a shaft;
a perforation motor that rotates the shaft;
an eccentric cam fitted to the shaft;
a perforation portion having a perforation blade that perforates a sheet, the perforation portion reciprocating the perforation blade in directions toward and away from the sheet as the eccentric cam rotates;
a rotation speed detecting portion that senses a rotation speed of the shaft;
a home position detecting portion that detects whether the perforation blade is at a home position away from the sheet; and
a controller that controls driving of the perforation motor,
wherein
the perforation portion includes
at least one first perforation portion that performs first perforation on the sheet with a first perforation blade and
at least one second perforation portion that performs second perforation on the sheet with a second perforation blade,
the first and second perforation portion being disposed at positions away from each other in an axial direction with respect to the shaft,
the eccentric cam includes
at least a first cam that reciprocates the first perforation blade in the first perforation portion and
at least a second cam that reciprocates the second perforation blade in the second perforation portion,
the first and second cams being disposed at positions facing the first perforation portion and the second perforation portions respectively,
the second cam being disposed with a delay n phase of 180° from the first cam with respect to a first rotation direction of the shaft,
the controller performs
a first perforation processing to perform the first perforation with the first perforation portion by rotating the shaft through 180°,
a second perforation processing to perform the first perforation with the first perforation portion and the second perforation with the second perforation portion in sequence, and
braking control to brake the perforation motor such that the first and second perforation blades stop at the home position,
the controller detects with the rotation speed detecting portion the rotation speed of the shaft after the first perforation blade penetrates the sheet during the first perforation, and
based on the rotation speed detected by the rotation speed detecting portion, the controller determines timing of starting the braking control in the second perforation and performs the braking control,
in a case where a stop position of the perforation blade when the perforation motor is stopped is deviated from the home position, the controller rotates the perforation motor in the first rotation direction, or in a second rotation direction opposite from the first rotation direction at a lower speed than during perforation so as to move the perforation blade to the home position, wherein
the home position detecting portion detects whether a rotation angle of the first cam or the second cam is a reference angle, and

the home position is a range of position in which the perforation blade is located as the shaft is rotated in the first or second rotation direction after the home position detecting portion detects the first or second cam being at the reference angle until a number of the pulse signal outputs from the rotation speed detecting portion reaches a predefined positioning pulse count,
when in the braking control, the perforation motor is stopped before the perforation blade reaches the home position, the controller rotates the perforation motor in the first or second rotation direction so that, after the first or second cam reaches the reference angle, when the first or second cams rotated by the number of positioning pulses, the controller stops the perforation motor, and
when in the braking control, the perforation motor is stopped after the perforation blade passes the home position, the controller rotates the perforation motor in an opposite direction by a number of excess pulses by which, after the first or second cam reached the reference angle, the output of the rotation speed detecting portion is beyond the positioning pulse count.

2. The perforation device according to claim 1 , wherein
in the second perforation processing, the rotation speed of the shaft in the second perforation is higher than the rotation speed of the shaft in the first perforation.

3. The perforation device according to claim 1 , wherein
the rotation speed detecting portion includes
a first pulse plate that is fitted to the shaft and that has a plurality of slits formed at intervals of a predetermined angle in a rotation direction and
a first sensor portion that reads the slits of the first pulse plate to output a pulse signal in accordance with rotation of the first pulse plate, and
when a number of pulses read by the first sensor portion reaches a predetermined value from the home position, the controller starts the braking control.

4. The perforation device according to claim 3 , wherein
the controller changes the predetermined value in accordance with the rotation speed of the shaft after the first perforation blade penetrated the sheet in the first perforation.

5. The perforation device according to claim 3 , wherein
the rotation speed of the shaft is calculated from a time interval between a pulse occurring in the pulse signal when the first perforation blade reaches a low point in the first perforation and a next pulse in the pulse signal.

6. The perforation device according to claim 1 , wherein
the first perforation portion includes two of the first perforation portions,
the second perforation portion includes two of the second perforation portions,
two of the first perforation portions are provided at two places corresponding to a middle part of the sheet in a width direction thereof,
two of the second perforation portions are provided at two places corresponding to opposite end parts of the sheet in the width direction thereof,
as the first perforation processing, two-hole perforation is performed such that the sheet is perforated at two places in the middle part of the sheet in the width direction thereof, and
as the second perforation processing, four-hole perforation is performed such that the sheet is perforated at two places in the middle part of the sheet in the width direction thereof and at two places in the opposite end parts of the sheet in the width direction thereof.

7. The perforation device according to claim 1 , wherein
the controller performs the braking control by short-circuit braking.

8. A sheet post-processing device comprising the perforation device according to claim 1 .

Assignees

• Kyocera Document Solutions Inc

Inventors

• Okada Rina
• Miyazaki Masahiko

Classifications

• B65H35/0006 Primary

  Article or web delivery apparatus incorporating cutting or line-perforating devices · CPC title

• B65H2403/943

  Electronic shaft arrangement · CPC title

• B65H35/0086 Primary

  using movable cutting elements · CPC title

• B65H35/06 Primary

  from or with blade, e.g. shear-blade, cutters or perforators (from or with revolving blade B65H35/08) · CPC title

• B65H35/0073

  Details · CPC title