Cutting – Means to drive or to guide tool – With simple rectilinear reciprocating motion only
Reexamination Certificate
1999-11-12
2001-05-15
Bray, W. Donald (Department: 3725)
Cutting
Means to drive or to guide tool
With simple rectilinear reciprocating motion only
C083S622000
Reexamination Certificate
active
06230599
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to the provision of means for automatically punching sheets of paper as they are fed, one by one, into a sheet post processing machine from a printing or copying machine.
BACKGROUND OF THE INVENTION
The art of punching sheets of paper for assembly into booklets or binders is highly developed.
Examples in the prior art include Glaeser patent U.S. Pat. No. 1,739,572, granted Dec. 10, 1929 in which a pair of holes or three holes can be punched into a sheet or plurality of sheets by manually depressing cylindrical punches, which are spring loaded to an upward position, to force the punches into a die plate so as to form punched holes in the paper.
Particularly, in recent years, with the advent of sheet post processing devices which are employed in association with printers and copiers for feeding sheets of paper serially to form sets of paper, it has become the practice to include automatic means for punching the sheet with two or more holes, as the sheet is moved into the post processing unit from the printer or copier.
Such a post processing machine, for example, is shown in Muramatu et al patent U.S. Pat. No. 4,988,030 granted Jan. 29, 1991 wherein a photocopying machine supplies sheets which are punched and stapled before delivery to a paper receiving tray.
Shigemura et al patent U.S. Pat. No. 5,253,030 granted Oct. 12, 1993 shows another form of apparatus as the sheets are post processed. As disclosed in this patent, a number of punches are arranged transversely of the sheet path between a plate which defines a guide for the punches and a second plate which defines a die for each of the punches. The punches are cam actuated and individually spring loaded to an upper position. Also in this construction, the punch actuating cams are mounted upon a common shaft and sequentially cause the punches to be driven through the paper and into the respective die holes thereby delaying the timing of the punching action of the punches to relieve the load on the drive system.
Various other punching systems are known enabling the sheet to be punched on the fly between opposed rotary dies and punches, by moving the punch assembly along with the sheet or by temporarily halting movement of the sheet in the punch assembly.
SUMMARY OF THE INVENTION
The present invention relates to a punch construction in which the sheets of paper are delivered from a copier or printer between a pair of pressure applying and die plates by a pair of cams mounted on a common drive shaft which moves a pair of cam followers disposed in spaced relation and wherein the shaft is spring loaded to retract the punches as permitted by the camming action and wherein the punches are of different lengths so as to reduce the load on the drive system during the punching operation.
An object of the invention is to provide simple punching structure, including sheet infeeding means and sheet outfeeding drive rolls, wherein the rolls can be temporarily halted, causing the sheet of paper to momentarily buckle upstream of the feed direction during the punching operations as the forward motion of the sheet is temporarily halted.
Other objects and advantages of the invention will be recognized or will be described in the following description of the drawings forming a part of this application.
REFERENCES:
patent: 4065990 (1978-01-01), Edhlund
patent: 5253030 (1993-10-01), Shigemura et al.
Coombs Peter M.
Seay James R
Bray W. Donald
Gradco (Japan) Ltd.
Lee, Jr. Newton H.
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