Web bending fixture
AssigneeChesley F. Carlson Company
InventorRoger Klukow
Life of this patent
Estimating the term…
Abstract
A web bending fixture to bend lithographic plates used in web offset printing and production. Precise bends are created by a precision machine tool fixture. The fixture utilizes continuously supported eccentric camming members, one on each end of the fixture, each supported by a plurality of split bearings within which the camming members rotate. After the lithographic plate is precisely aligned with unique registration means and immobilized, the camming members, are moved into position and, rotating within the bearings, form the leading and trailing edges of the plate around precisely positioned and fixed anvils.
Claims27
A web bending fixture for bending plates of metal having a leading edge and a trailing edge comprising:
- a bed to support the plate to be bent;
- at least one anvil having a bending radius at the edge of the bed;
- at least one eccentric camming member having a bending surface positioned relative to the anvil to bend one of the edges of the plate around the bending radius of the anvil;
- a full bearing supporting each end of the eccentric camming member for rotation;
- a plurality of additional bearings intermediate the ends of the eccentric camming member within which the eccentric camming member is rotatably contained during rotation, the additional bearings being spaced along the length of the eccentric camming member to radially support the eccentric camming member throughout its length;
- and
- means for rotating the eccentric camming member around the bending radius of the anvil, the closest point on the bending surface of the eccentric camming member being spaced from the anvil at all times during rotation a distance equivalent to the thickness of the plate being bent.
The web bending fixture of claim further comprising:
- an end plate on each end of the eccentric camming member;
- a header bar secured between the end plates;
- a plurality of upper split bearing mounts having upper bearing surfaces secured to the header bar;
- a plurality of lower split bearing mounts having lower bearing surfaces secured to the bed;
- means for slidably attaching the end plates to the bed of the web bending fixture;
- clamp means operatively secured to the header bar;
- first motive means connected to the end plates to slide the clamp means into engagement with the plate to clamp the plate to the bed of the web bending fixture and to slide the upper split bearing mounts into a secured engagement with the lower split bearing mounts to provide the plurality of additional bearings and so that a plurality of continuous bearing surfaces are provided to support the eccentric camming member during rotation;
- and
- second motive means connected to the means for rotating the eccentric camming member so that a bend is formed in the edge of the plate.
A web bending fixture for bending plates of metal having an image thereon and a leading edge and a trialing edge comprising:
- a bed to support the plate to be bent;
- two anvils at opposing ends of the bed, each having a bending radius at the edge of the bed;
- a set of two eccentric camming members, one associated with each anvil, each eccentric camming member having a bending surface positioned relative to the adjacent anvil to bend one of the edges of the plate around the bending radius of the anvil;
- two sets of end plates, one set associated with each eccentric camming member to provide an end plate on each end of each of the eccentric camming members, each end plate having a full bearing mounted therein for supporting the end of the eccentric camming member with which it is associated for rotation;
- a header bar secured between each of the two sets of end plates;
- a plurality of upper split bearing mounts having upper bearing surfaces secured to each header bar;
- a plurality of lower split bearing mounts having lower bearing surfaces secured to the bed below each header bar;
- means for slidably attaching the end plates to the bed of the web bending fixture in a manner that they can be moved upwardly and downwardly;
- means for positioning a plate on the bed;
- means for aligning the plate on the bed so that the image on the plate is in registration with the bends to be formed in the plate;
- clamp means operatively secured to each header bar;
- a first set of four cylinders, one connected to each end plate to vertically move the end plates downwardly so that the clamp means clamp the leading edge and trailing edge of the plate to the bed of the web bending fixture and so that the upper split bearing mounts are moved into a secured engagement with the lower split bearing mounts to provide a plurality of additional bearings intermediate the ends of each of the eccentric camming members each of the plurality of additional bearings having a continuous bearing surface when secured together to support each eccentric camming member throughout its length during rotation;
- means for rotating each of the eccentric camming members around the bending radius of the adjacent anvil so that the closest point on the bending surface of each eccentric camming member is spaced from the adjacent anvil at all times during rotation a distance equivalent to the thickness of the plate being bent, said means for rotating the eccentric camming member comprising:
- a rack and pinion gear associated with each end of each eccentric camming member;
- and
- a second set of four cylinders, one on each end plate and connected to the racks to slidably move each rack in a downward direction so that the associated pinion gears rotate the eccentric camming members so that a bend is formed in the leading edge and the trailing edge of the plate;
- and means for removing the formed plate from the fixture.
Dependencies are inferred from the claim text.