Claims
- 1. 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.
- 2. The device according to claim 1, characterized in that said application means (10) is bounded by the part of a surface of the cylinder which the plate is brought against and includes, throughout the length of edges of said plate, a groove (11) which accommodates a seal (12) and, said orifices are a short distance from said seal, and said orifices are within said seal.
- 3. The device according to claim 2 further comprising a plurality of like-constructed arms and a plurality of like-constructed flange supports and wherein on a side opposite to the flange supports (23), the hubs (21) include counterweights (24) which, when the plate (3) is positioned away from the cylinder surface, balance the weight of the assembly formed by the arms (22), the flange supports (23) and said plate (3).
- 4. The device according to claim 2 wherein the arm (22) comprises a lift cylinder supplied with pressurized fluid through a circuit (25) controlled by a directional control valve (20).
- 5. The device according to claim 4 wherein said lift cylinder has an elastic element (27) which continuously pulls the support and, thus, the plate toward the cylinder.
- 6. The device according to claim 4 wherein the directional control valve (26) connected in the control circuit (25) of the adjustable arm (22) and the directional control valve (20) connected to the circuit (15) of the vacuum pump are connected by means (28) for ensuring the coexistence of:
- the placing under atmospheric pressure of the plate bottom and the pressurization of the lift cylinder for the separation of the plate, as well as
- the expulsion of the control fluid of the lift cylinder that separate the plate and of the application of suction to the plate bottom.
- 7. The device according to claim 1 wherein on a side opposite to the flange support (23), the hubs (21) include counterweights (24) which, when the plate (3) is positioned away from the cylinder surface (22), balance the weight of the assembly formed by the arms, the flange supports (23) and said plate (3).
- 8. The device according to claim 1 wherein the arms (22) comprise cylinders supplied with pressurized fluid through a circuit (25) controlled by a directional control valve.
- 9. 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.
- 10. Apparatus as defined by claim 9 further comprising a groove (11) which accommodates a sealing ring (12) provided along the edges of the support zone portion and wherein the bores (13) are distributed along the seal (12) and discharge into a peripheral groove (16).
- 11. Apparatus as defined by claim 9, wherein the means for controlling the variation in the length of the arms (22) include springs (27) which are operable to press the plate against said support zone portion.
Priority Claims (1)
Number |
Date |
Country |
Kind |
82 09702 |
May 1982 |
FRX |
|
Parent Case Info
This is a continuation of application Ser. No. 496,582, filed on May 20, 1983, now abandoned.
US Referenced Citations (8)
Non-Patent Literature Citations (1)
Entry |
Hydraulics-FOS Fundementals of Service Deere & Co. Moline, Ill. 3rd Ed. 1979, pp. 3-6, 3-7. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
496582 |
May 1983 |
|