Claims
- 1. A plate cylinder for fastening a printing plate having a posterior end and an anterior end, the plate cylinder having a longitudinal axis of rotation, the plate cylinder comprising:
- an external surface, the plate cylinder having a longitudinal bore and a longitudinal slit, the longitudinal slit having a first mouth and a second mouth, the first mouth opening along the external surface of the plate cylinder and the second mouth opening along the longitudinal bore;
- the longitudinal slit defining a rear side and a front side, the rear side of the longitudinal slit connecting with the external surface of the printing plate to form a spur for fastening the anterior end of the printing plate;
- a leaf having a first end and a second end, the leaf located in the longitudinal slit and having a hook-forming rim at the first end facing rearwardly, the hook-forming rim for contacting the posterior end of the printing plate;
- a bar located at least partially in the longitudinal bore and connected to the leaf at the second end of the leaf, the bar moving the leaf between a first limiting position in which the leaf projects with respect to the external surface and a second limiting position in which the leaf is retracted into the longitudinal slit, the leaf being engageable and disengageable from the bar; and
- an elastic retaining element securing the leaf to the bar, the leaf being supported in its engaged position by a side wall.
- 2. The plate cylinder as recited in claim 1 wherein the leaf is a spring leaf.
- 3. The plate cylinder as recited in claim 1 wherein the bar is a longitudinal tension bar, the tension bar pivotable about a longitudinal pivot axis located between an axis of rotation of the plate cylinder and the longitudinal slit.
- 4. The plate cylinder as recited in claim 3 further comprising:
- a torsion bar coaxial with the tension bar for elastically urging the tension bar in a direction counter to the direction of rotation of the plate cylinder.
- 5. The plate cylinder as recited in claim 4 further comprising:
- a single-acting thrust cylinder urging the tension bar in a controlled manner towards a limiting orientation corresponding to the first limiting position of the leaf.
- 6. The plate cylinder as recited in claim 3 wherein the leaf is connected to the tension bar to the rear of the tension bar pivot axis.
- 7. The plate cylinder as recited in claim 6 wherein the tension bar has a longitudinal tension bar spur for contacting the leaf between the first end and the second end of the leaf.
- 8. The plate cylinder as recited in claim 1 wherein the first end of the leaf is offset towards the front with respect to the second end of the leaf.
- 9. The plate cylinder as recited in claim 1 wherein the first mouth of the slit is in front of the second mouth of the slit.
- 10. The plate cylinder as recited in claim 1 wherein the rear and front sides of the slit are approximately parallel.
- 11. A rotary printing press comprising:
- a frame;
- a plate cylinder rotatably supported in the frame and for fastening a printing plate having a posterior end and an anterior end, the plate cylinder having a longitudinal axis of rotation, the plate cylinder comprising:
- an external surface, the plate cylinder having a longitudinal bore and a longitudinal slit, the longitudinal slit having a first mouth and a second mouth, the first mouth opening along the external surface of the plate cylinder and the second mouth opening along the longitudinal bore;
- the longitudinal slit defining a rear side and a front side, the rear side of the longitudinal slit connecting with the external surface of the printing plate to form a spur for fastening the anterior end of the printing plate;
- a leaf having a first end and a second end, the leaf located in the longitudinal slit and having a hook-forming rim at the first end facing rearwardly, the hook-forming rim for contacting the posterior end of the printing plate;
- a bar located at least partially in the longitudinal bore and connected to the leaf at the second end of the leaf, the bar moving the leaf between a first limiting position and a second limiting position;
- the leaf projecting with respect to the external surface in the first limiting position and the leaf retracted into the longitudinal slit in the second limiting position slit, the leaf being engageable and disengageable from the bar; and
- an elastic retaining element securing the leaf to the bar, the leaf being supported in its engaged position by a side wall.
- 12. The printing press according to claim 11, further comprising:
- a pusher connected to the frame and juxtaposed with the external surface of the plate cylinder, the pusher for bearing on the plate as it is wound about the plate cylinder.
Priority Claims (1)
Number |
Date |
Country |
Kind |
93 10143 |
Aug 1993 |
FRX |
|
Parent Case Info
This application is a continuation of application Ser. No. 08/293,996, filed Aug. 22, 1994, now abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (4)
Number |
Date |
Country |
516260 |
Dec 1992 |
EPX |
2147482 |
Mar 1973 |
FRX |
2126941 |
Nov 1972 |
DEX |
58-138651 |
Aug 1983 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
293996 |
Aug 1994 |
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