US 9,896,298 B2Granted

Apparatus and method for cutting sheet

AssigneeCanon Kabushiki Kaisha

InventorsMasahito Yoshida, Tetsuhiro Nitta, Kota Uchida, Takayuki Okamoto

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Abstract

A sheet is cut between a first conveying unit and a second conveying unit in a state in which the first and second conveying units halt and in which an upstream conveying unit conveys the sheet at a first speed; after the sheet is cut, the first conveying unit conveys the sheet at a second speed higher than the first speed to reduce a slack formed during the halting; after the sheet is cut, the second conveying unit conveys the downstream-side sheet at a third speed higher than the first speed; if the third conveying unit is nipping the sheet during cutting, the third conveying unit conveys the sheet at the third speed; and if the third conveying unit is not nipping the sheet, the third conveying unit conveys the sheet at the third speed or a fourth speed after the detecting unit detects the sheet.

Claims14

Dependent claims

A sheet cutting apparatus comprising:

a first conveying unit that conveys a sheet;
an upstream conveying unit that is disposed upstream of the first conveying unit in a conveying direction and that conveys the sheet at a first conveying speed;
a cutting unit that is disposed downstream of the first conveying unit in the conveying direction and that cuts the sheet;
a second conveying unit that is disposed downstream of the cutting unit in the conveying direction and that conveys the sheet;
a third conveying unit that is disposed downstream of the second conveying unit and that conveys the sheet;
a detecting unit that is disposed between the second conveying unit and the third conveying unit and that detects the sheet;
and
a determination unit configured to determine whether the third conveying unit is nipping the sheet during cutting of the sheet,
wherein the first conveying unit and the second conveying unit convey the sheet at the first conveying speed before the sheet reaches a cutting position;
wherein, the cutting unit cuts the sheet into a downstream part and an upstream part in a state in which the first conveying unit and the second conveying unit are stopped and the upstream conveying unit is conveying the sheet at the first conveying speed;
and
wherein, after the sheet is cut, the second conveying unit conveys the downstream part of the sheet at a second conveying speed higher than the first conveying speed, after the sheet is cut, the first conveying unit conveys the upstream part of the sheet at a conveying speed higher than the first conveying speed to reduce the slack of the upstream part of the sheet, formed between the upstream conveying unit and the first conveying unit during a state in which the first conveying unit and the second conveying unit are stopped;
and
in a case where the determination unit determines that the third conveying unit is nipping the sheet during cutting of the sheet, after the detecting unit detects the sheet and before the cutting unit cuts the sheet, the third conveying unit conveys the sheet at the first conveying speed, and after the cutting unit cuts the sheet, the third conveying unit conveys the downstream part of the sheet at the second conveying speed higher than the first conveying speed, and
in a case where the determination unit determines that the third conveying unit is not nipping the sheet during cutting of the sheet, after the detecting unit detects the sheet, the third conveying unit does not convey the sheet at the first speed, but conveys the sheet at the second speed wherein said sheet cutting apparatus further comprises a second cutting unit between the second conveying unit and the third conveying unit, wherein a portion to be discharged of the downstream part of the sheet that is cut by the cutting unit is cut by the second cutting unit.

12 more elements

A sheet cutting method for controlling an apparatus comprising a first conveying unit that conveys a sheet;

an upstream conveying unit that is disposed upstream of the first conveying unit in a conveying direction and that conveys the sheet at a first conveying speed;
a cutting unit that is disposed downstream of the first conveying unit in the conveying direction and that cuts the sheet;
a second conveying unit that is disposed downstream of the cutting unit in the conveying direction and that conveys the sheet;
a third conveying unit that is disposed downstream of the second conveying unit and that conveys the sheet;
a detecting unit that is disposed between the second conveying unit and the third conveying unit and that detects the sheet;
and a determination unit configured to determine whether the third conveying unit is nipping the sheet during cutting of the sheet, the sheet cutting method comprising:
causing the first conveying unit and the second conveying unit to convey the sheet at the first conveying speed before the sheet reaches a cutting position;
causing the cutting unit to cut the sheet into a downstream part and an upstream part in a state in which the first conveying unit and the second conveying unit are stopped and the upstream conveying unit is conveying the sheet at the first conveying speed;
and
after the sheet is cut, causing the second conveying unit to convey the downstream part of the sheet at a second conveying speed higher than the first conveying speed,
after the sheet is cut, causing the first conveying unit to convey the upstream part of the sheet at a conveying speed higher than the first conveying speed to reduce the slack of the upstream part of the sheet, formed between the upstream conveying unit and the first conveying unit during a state in which the first conveying unit and the second conveying unit are stopped;
and
in a case where the determination unit determines that the third conveying unit is nipping the sheet during cutting of the sheet, after the detecting unit detects the sheet and before the cutting unit cuts the sheet, causing the third conveying unit to convey the sheet at the first conveying speed, and after the cutting unit cuts the sheet, causing the third conveying unit to convey the downstream part of the sheet at the second conveying speed higher than the first conveying speed, and
in a case where the determination unit determines that the third conveying unit is not nipping the sheet during cutting of the sheet, after the detecting unit detects the sheet, causing the third conveying unit not to convey the sheet at the first speed, but to convey the sheet at the second speed wherein said apparatus further comprises a second cutting unit between the second conveying unit and the third conveying unit, wherein a portion to be discharged of the downstream part of the sheet that is cut by the cutting unit is cut by the second cutting unit.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/927,234Filed 29 Oct 2015 · division
Priority: JP 2010-0878926 Apr 2010
Published: US 2016/0046459 A118 Feb 2016
Granted: 20 Feb 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification18 codes

B65H 35/06
From or with transverse cutters or perforators: from or with blade, e.g. shear-blade, cutters or perforators
B26D 1/085
Of the guillotine type: for thin material, e.g. for sheets, strips or the like
B26D 5/28
Wherein control means on the work feed means renders the cutting member operative: the control means being responsive to presence or absence of work
B26D 7/08
Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting: means for treating…