Suction-air control device for a sheet-transfer drum

Details Suction-air control device for a sheet-transfer drum Suction-air control device for a sheet-transfer drum

1994-05-10

1996-01-02

Skaggs, H. Grant

Sheet feeding or delivering

Feeding

By means to convey sheet

271108, 13762415, B65H 514

Patent

active

054801370

ABSTRACT:
A suction-air control device for a rotatable sheet-transfer drum having suction-type grippers disposed thereon and having a journal with a rotationally symmetrical surface, includes a rotary valve disposed on the journal of the sheet-transfer drum for connecting the suction-type grippers to a stationary suction-air source. A stationary housing is provided for the rotary valve. A device controls a supply of suction air from the suction-air source to the suction-type grippers with a time lead or a time lag as a function of the rotational speed of the sheet-transfer drum. At least one suction-air bore extends from the interior of the journal to the surface thereof. One suction-air bore is connectable to the suction-type grippers. The rotationally symmetrical surface of the journal forms a sealing surface of the rotary valve. At least one closing member formed with at least one air-passage opening disposed over a defined rotational-angle range connects the one suction-air bore formed in the journal with at least one connection hole formed in the housing of the rotary valve.

REFERENCES:
patent: 1921380 (1933-08-01), Barker, Jr.
patent: 2841391 (1958-07-01), Norton
patent: 3069025 (1962-12-01), Winkler et al.
patent: 3916790 (1975-11-01), Alix
patent: 4162066 (1979-07-01), McCain et al.

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