公开(公告)号：US3921971A

公开(公告)日：1975-11-25

申请号：US48445274

申请日：1974-06-28

Applicant: POLYGRAPH LEIPZIG

Inventor： VOLLRATH KARL-HANS

IPC: B41F21/06 ,  B65H3/08

CPC classification number: B65H3/0883

Abstract: The suction device includes a pneumatic cylinder and a hollow piston in the cylinder movable between a retracted and a nonretracted position and comprised of axially adjacent first and second portions, at least a part of the circumferential periphery of each of the two portions being spaced from and out of contact with the inner periphery of the cylinder to define therewith respective first and second spaces. The piston unit includes a sheet-engaging portion having a suction opening which communicates with the ambient atmosphere and constitutes the end of the hollow interior of the piston unit, the hollow interior communicating with the second space via the first space. The cylinder is provided with a suction port opening into the second space to form a path for the flow of ambient air into the suction opening and out through the suction port, the flow cross section of the first space being smaller than that of the second space so that the first space constitutes a flow restriction in such path.

Abstract translation: 抽吸装置包括气缸和缸中的中空活塞，可在缩回位置和非缩回位置之间移动并且包括轴向相邻的第一和第二部分，两个部分中的每一个的周向周边的至少一部分间隔开 与气缸的内周接触和脱离接触，以与其相应地限定第一和第二空间。 活塞单元包括具有吸入开口的片接合部，吸入口与环境大气连通并构成活塞单元的中空内部的端部，中空内部经由第一空间与第二空间连通。 气缸设有一吸入口，该抽吸口通向第二空间，以形成用于使周围空气流入吸入口的通道，并通过抽吸口流出，第一空间的流动横截面小于第二空间 使得第一空间在该路径中构成流量限制。