Apparatus for changing the length of envelope blanks cut from a

Details Apparatus for changing the length of envelope blanks cut from a Apparatus for changing the length of envelope blanks cut from a

1977-06-06

1979-01-30

Coan, James F.

Cutting

Cutter with timed stroke relative to moving work

Uniform periodic tool actuation

83911, 93 63R, B31B 116

Patent

active

041365917

ABSTRACT:
A drive shaft of the gumming and folding section of an envelope machine rotates at a preselected speed and is drivingly connected through meshing gears to the input shaft of a variable speed drive mechanism. The input shaft is connected to an output shaft through a differential transmission so that the output shaft is driven at a preselected ratio relative to the speed of the input shaft. The output shaft is drivingly connected to a web feeding apparatus that conveys a continuous web of material from a supply roll at a preselected speed. Thus, the web feeding apparatus is driven at a predetermined ratio relative to the speed of the drive shaft. A web cutting apparatus is drivingly connected to the input shaft so that a cut off knife is rotated at a fixed speed relative to the drive shaft to cut the continuous web at preselected intervals to form envelope blanks having a bottom flap connected to a closure flap. The variable speed drive mechanism is operable to change the speed of the output shaft relative to the input shaft to change the length of the envelope blank.

REFERENCES:
patent: 1851061 (1932-03-01), Poppe
patent: 2054832 (1936-09-01), Potdevin
patent: 3128662 (1964-04-01), Obenshain
patent: 4020722 (1977-05-01), Byrt et al.

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