Printing – Rolling contact machines – Rotary
Patent
1990-01-16
1991-12-03
Burr, Edgar S.
Printing
Rolling contact machines
Rotary
101246, B41F 504
Patent
active
050691260
ABSTRACT:
An electrical circuit-breaking device for protecting a clamping device of a sheet-guiding drum of a printing machine, wherein the clamping device has an actuating member formed with a thread and being turningly screwable therewith in axial direction over a first travel phase and a second travel phase between end positions, includes a switching member for an electrical switch connected in a power-supply circuit for driving the printing machine, the switching member being actuatable in the first travel phase of the actuating member, a device defining at least one friction surface on the sheet-guiding drum and at least one friction surface of a drum part adjustable on the drum in circumferential direction thereof, intermediate members for pressing the friction surfaces against one another, the intermediate members being actuatable in the second travel phase of the actuating member, a stop device effective in turning direction of the actuating member including a cam on the actuating member, and two cams on a machine part fixed against rotation, the two cams fixed against rotation being assigned, respectively, to each of the end positions and being spaced from one another in the axial direction of the actuating member a distance greater than a thread pitch of the thread formed in the actuating member, the cam on the actuating member having an area overlapping at the respective end positions with a respective area of each of the two cams on the machine part, the mutually overlapping areas being smaller in the axial direction then the thread pitch.
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patent: 4924988 (1990-05-01), Page
Burr Edgar S.
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Hilten John S.
Lerner Herbert L.
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