Device for fixing a plate on a cylinder
OwnerJean P. Cuir, Gerard Cuirinventors
Life of this patent
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Abstract
The invention relates to a device for fixing a plate on a cylinder, while permitting to quickly control, at certain instants, the application and fixation of this plate on a particular angular portion of this cylinder and, at other instants, the disengagement of this plate. It is characterized by the fact that, in addition to means (9) enabling the plate (3) to be brought against the cylinder or, on the contrary, separating it from its area of support, it comprises means (10) for fully applying on the cylinder both the median portion and the ends of the plate. Application to the mechanical construction industry and, more particularly, to rotary printing and cutting machines.
Claims11
A device for mounting a plate (3) on a cylinder (11), said device permitting the quick application and fixation of said plate (3) on a particular angular portion of said cylinder and, said device also permitting the disengagement of said plate from the cylinder (1), said device comprising two shaft ends (4) by which said cylinder (1) is guided and driven into rotation about an axis (5), said device including positioning means (9) operable to move the plate (3) toward the cylinder (1) and away from the cylinder (1), said positioning means comprising two hubs (21), each hub being mounted on one of the shaft ends (4) of the cylinder (1) and being free to rotate at least over an angular range relative to the cylinder, and at least one flange support (23) connected on one side to at least one of said hubs (21), through at least one arm (22) of adjustable length for securing one end of the plate (3), said device also including means (10) for fully applying on the cylinder both the median portion and the ends of the plate, said means for applying including a hollow cavity (18) within said cylinder forming a chamber disposed between orifices (13) formed in the cylinder and a circuit (14) of a vacuum pump (15), said circuit being equipped with a check valve (17) and connected to a directional control valve (20) which enables said circuit to discharge into the atmosphere.
Apparatus comprising a printing plate (3) fixable to an angular support zone portion (A) of a cylindrically curved surface (2) of a printing cylinder (1), wherein said support zone portion has holes (13) which are connected via a circuit (14) with a vacuum pump (15) and operatable to apply suction to the printing plate to press the printing plate securely upon the support zone portion, said cylinder being guided in rotation about its axis (5) by two shaft ends (4) provided on opposite ends of said cylinder, and further comprising:
- two hubs (21) each engaging one of the shaft ends (4) and which are free to rotate about the axis (5) of the cylinder, both with respect to the shaft ends (4) and with respect to the cylindrically curved surface (2) of the cylinder;
- two arms of variable length (22), each having a first end connected to one of the hubs (21);
- said arms (22) being operable to move the plate around and toward and away from said cylinder (1),
- a plate support (23) attached to a second end of each arm (22) and comprising means for removably securing the plate at said support, and
- means for controlling the variation in the length of the arms (22) both in the direction where they press the plate (3) against the support zone portion and in a direction where they separate the plate (3) from the support zone portion.
Dependencies are inferred from the claim text.