B - Operations – Transporting – 65 – H
Patent
B - Operations, Transporting
65
H
270/150
B65H 3/10 (2006.01) B65H 3/08 (2006.01)
Patent
CA 1116194
INVENTOR: WERNER GLATZ INVENTION: APPARATUS FOR ENGAGING AND MOVING INDIVIDUAL FLAT STRUCTURES, ESPECIALLY PAPER SHEETS OR PRINTED PRODUCTS ABSTRACT OF THE DISCLOSURE An apparatus for destacking a stack of flexible flat structures, especially paper sheets or printed products, compris- ing a suction head which can be moved, by means of a drive device along a closed path of travel. This suction head is periodically connected, by means of a valve arrangement, with a source of negative pressure, and thereafter is again disconnected from such source. This valve arrangement comprises a cylindrical valve body attached to a drive shaft of the drive device for the suction head. This valve body rotates in a valve housing having three housing connections which, viewed in the direction of rotation of the valve body, are arranged behind one another. The forwardmost housing connection, viewed in such rotational direction, is con- nected withthe negative pressure source, whereas the intermediate housing connection is connected with the suction head. The last housing connection serves for venting and is connected with the surroundings. The valve body has a recess extending over part of its circumference and opening in the direction of the circumfer- ential surface of the valve housing. During its rotation the valve body, by means of its recess initially connects the forward most housing connection with the intermediate housing connection, and thus, the suction head with the negative pressure source. During further rotation this connection is interrupted and there- after the intermediate housing connection is coupled, by means of the recess, with the last housing connection, so that the suction head is again exposed to atmospheric pressure. The valve arrangement is synchronized with the movement of the suction head so that at that point in time when the suction head engages with a flat structure this suction head is operatively coupled with the negative pressure source, whereas at the point in time of release of the engaged flat structure the suction head is con- nected with the atmosphere. The described valve arrangement, even at high rotational speeds of the valve body, allows for a faultless establishment of the requisite negative pressure or vacuum at the suction head. - 2 -
320584
Ferag Ag
Gowling Lafleur Henderson Llp
LandOfFree
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