Sheet punching device featuring selectively usable punch trains
AssigneeCanon Kabushiki Kaisha
InventorsNoriyoshi Ueda, Nobutaka Uto
Life of this patent
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Abstract
A sheet punching device cuts holes in a sheet while punches are entering die holes. The sheet punching device includes, a plurality of punch trains, each of which includes a plurality of the punches axially aligned on a rotating shaft and projecting in a radial direction of the. The plurality of punch trains is disposed in a rotation direction of the rotating shaft relative to one another, and the die holes are disposed in correspondence with the plurality of punches. One of the plurality of punch trains is selectively used in cutting holes in the sheet.
Claims10
A sheet punching device for cutting holes in a sheet while punches are entering die holes, said sheet punching device comprising:
- two punch trains, each of which includes a plurality of said punches axially aligned on a rotary shaft and projecting in a radial direction of said shaft,
- wherein said two punch trains are disposed in a rotation direction of said shaft relative to one another, and said die holes are disposed in correspondence with said plurality of punches,
- wherein said two punch trains are disposed on said shaft at an angle of approximately 180° with respect to each other in the rotation direction,
- wherein a number of said plurality of punches in one punch train of said two punch trains is two, and
- wherein a number of said plurality of punches in the other punch train of said two punch trains is three;
- and
- means for selecting only one of said two punch trains to cut holes in the sheet.
A sheet punching device for cutting holes in a sheet while punches are entering die holes, said sheet punching device comprising:
- a plurality of punch trains, each of which includes a plurality of said punches axially aligned on a rotary shaft and projecting in a radial direction of said shaft,
- wherein a number of said plurality of punches in each of said plurality of punch trains is different,
- wherein said plurality of punch trains are disposed in a rotation direction of said shaft relative to one another, and said die holes are disposed in correspondence with said plurality of punches, and
- wherein said die holes are formed in dies and are arranged into two trains of die holes;
- means for rotating only said plurality of punches and said die holes rotate in synchronism with each other to cut holes in the sheet and means for selectively only using one of said plurality of punch trains to cut holes in the sheets.
A sheet punching device for cutting holes in a sheet while punches are entering die holes, said sheet punching device comprising:
- a plurality of punch trains, each of which includes a plurality of said punches axially aligned on a rotary shaft and projecting in a radial direction of said shaft,
- wherein a number of said plurality of punches in each of said plurality of punch trains is different,
- wherein said plurality of punch trains are disposed in a rotation direction of said shaft relative to another, and said die holes are disposed in correspondence with said plurality of punches,
- wherein said die holes are formed in at least one die and are arranged into a train of die holes,
- means for selecting only one punch train of said plurality of punch trains to cut holes in the sheet, and
- wherein said plurality of punch trains rotate through a given angle to position said plurality of punches of said selected punch train relative to said at least one punch train of die holes so that said plurality of punches of the selected one punch train cut holes in the sheet while reciprocating.
Dependencies are inferred from the claim text.