US3677059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithoplate bender
Assignee: Standard Register Co
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Filing: 1971-02-19
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Granted: 1972-07-18
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Expires: 1991-02-19
Abstract
Abstract A semiautomatic machine for simultaneously bending the leading and trailing edges of a lithographic printing plate. The plate bender has a ruggedly constructed frame which supports and guides a vertically movable plate supporting bed. The bed has a fixed anvil with a pair of spaced locating pins and an anvil which is movable relative to the fixed anvil to adapt the bender to bend different size printing plates. A fixed and movable pressure block are supported a short distance above the fixed and movable anvils, respectively. Each of the pressure blocks has a spring biased vertically movable gripping face and a cam operated horizontally movable forming block. An adapter is also provided to enable the bender to shape lithographic plates smaller than the adjustable range of the bender. In operation, a prepunched lithographic printing plate is positioned on the locating pins. The plate supporting bed is then driven vertically by a pneumatic cylinder to bring the plate and anvils into engagement with the pressure blocks. The bed continues to rise causing the pressure blocks to firmly grip the printing plate and to rise against the downward biasing force. As the pressure blocks move a camming slot at each end of the blocks acts upon a cam follower within the slot causing it to move in a horizontal direction relative to the pressure block. The cam followers draw the forming blocks inward toward the printing plate causing the leading and trailing edges of the plate to simultaneously bend inward against forming faces on the anvils. After the plate is bent the bed is lowered allowing the operator to slide the formed plate off of the anvils.
Inventors
- 👤 Leo H Miller
- 👤 James A Colegrove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:35
CPC Classifications
B; B41; B41F; B41F27/00; B41F27/12; B41F27/1287; B21; B21D; B21D5/00; B21D5/04; B21D5/045
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
123 words
A lithoplate bender comprising: a supporting frame, a pair of spaced biased pressure blocks mounted within said frame, a movable table within said frame which is adapted to move toward said pressure blocks, a pair of spaced anvil means on said table, said anvil means being adapted to move said pressure blocks when the table moves bringing said anvils into engagement with said pressure blocks, a forming block associated with each of said pressure blocks, a driving means on each of said pressure blocks, a driven means on each of said forming blocks which is adapted to move said forming block into engagement with the anvils on said table when said anvils move said pressure blocks, and a driving means for said table.
Claim 2
Dependent Claim
123 words
A lithoplate bender comprising: a supporting frame, a pair of spaced biased pressure blocks mounted within said frame, a movable table within said frame which is adapted to move toward said pressure blocks, a pair of spaced anvil means on said table, said anvil means being adapted to move said pressure blocks when the table moves bringing said anvils into engagement with said pressure blocks, a forming block associated with each of said pressure blocks, a driving means on each of said pressure blocks, a driven means on each of said forming blocks which is adapted to move said forming block into engagement with the anvils on said table when said anvils move said pressure blocks, and a driving means for said table.
Claim 3
Dependent Claim
26 words
A lithoplate bender as set forth in claim 1 wherein said pressure blocks are spring biased and are disposed near the top of said supporting frame.
Claim 4
Dependent Claim
27 words
A lithoplate bender as set forth in claim 1 wherein one of said pair of spaced biased pressure blocks is adjustable relative to the other pressure block.
Claim 5
Dependent Claim
26 words
A lithoplate bender as set forth in claim 1 wherein one of said pair of spaced anvil means is adjustable relative to the other anvil means.
Claim 6
Dependent Claim
19 words
A lithoplate bender as set forth in claim 1 wherein said spaced anvil means have plate bend forming surfaces.
Claim 7
Dependent Claim
31 words
A lithoplate bender as set forth in claim 1 wherein one of said anvil means has a pair of spaced pins for locating a lithographic printing plate on said spaced anvils.
Claim 8
Dependent Claim
35 words
A lithoplate bender as set forth in claim 5 wherein one of said spaced anvil means has approximately a 60* plate forming surface and the other anvil means has approximately a 45* plate forming surface.
Claim 9
Dependent Claim
29 words
A lithoplate bender as set forth in claim 1 wherein each of said forming blocks is shaped to mate with the plate forming surface on the cooperating anvil means.
Claim 10
Dependent Claim
23 words
A lithoplate bender as set forth in claim 1 wherein said driving means on each of said pressure blocks is a camming slot.
Claim 11
Dependent Claim
34 words
A lithoplate bender as set forth in claim 1 wherein said driven means on each of said forming blocks is a cam follower located within the camming slot on each of said pressure blocks.
Claim 12
Dependent Claim
37 words
A lithoplate bender as set forth in claim 1 wherein movement of said pressure blocks in a first direction results in movement of the associated forming block in a second direction substantially normal to said first direction.
Claim 13
Dependent Claim
51 words
A lithoplate bender as set forth in claim 1 wherein one of said anvil means produces a sharp bend in the printing plate to form an aligning edge while the other of said anvil means produces a smooth bend to provide for tightening of the printing plate on the press roll.
Claim 14
Dependent Claim
26 words
A lithoplate bender as set forth in claim 1 wherein an adapter is provided for mounting on one of said anvil means for bending small lithoplates.
Claim 15
Dependent Claim
21 words
A lithoplate bender as set forth in claim 13 wherein said adapter has a leading and a tail edge forming surface.
Claim 16
Dependent Claim
26 words
A lithoplate bender as set forth in claim 13 wherein said adapter has an approximately 60* leading edge and an approximately 45* tail edge forming surface.
Claim 17
Dependent Claim
28 words
A lithoplate bender as set forth in claim 13 wherein said adapter has a pair of spaced pins for locating a small lithographic printing plate on said adapter.
Claim 18
Dependent Claim
26 words
A lithoplate bender as set forth in claim 1 wherein the lithoplate bender has a limit switch to release said driving means for lowering said table.
Claim 19
Dependent Claim
175 words
A lithoplate bender comprising: a supporting frame, a movable table mounted within said frame, a pneumatic ram on said frame for moving said table, a fixed anvil having a plate forming surface disposed on said movable table, an adjustable anvil having a plate forming surface disposed on said table and movable relative to the fixed anvil, a spring biased pressure block movably supported by said frame for cooperating with said fixeD anvil, an adjustable spring biased pressure block movably supported by said frame for cooperating with said adjustable anvil, a pair of spaced camming slots on each of said pressure blocks, a movable forming block associated with each of said pressure blocks, and a pair of cam followers on each of said movable forming blocks which are guided within the camming slots on each pressure block, said table being adapted to move bringing the anvils into engagement with said pressure blocks, further movement of said table causing said pressure blocks to move camming the forming blocks into engagement with the forming surfaces on said anvils.
Claim 20
Dependent Claim
175 words
A lithoplate bender comprising: a supporting frame, a movable table mounted within said frame, a pneumatic ram on said frame for moving said table, a fixed anvil having a plate forming surface disposed on said movable table, an adjustable anvil having a plate forming surface disposed on said table and movable relative to the fixed anvil, a spring biased pressure block movably supported by said frame for cooperating with said fixeD anvil, an adjustable spring biased pressure block movably supported by said frame for cooperating with said adjustable anvil, a pair of spaced camming slots on each of said pressure blocks, a movable forming block associated with each of said pressure blocks, and a pair of cam followers on each of said movable forming blocks which are guided within the camming slots on each pressure block, said table being adapted to move bringing the anvils into engagement with said pressure blocks, further movement of said table causing said pressure blocks to move camming the forming blocks into engagement with the forming surfaces on said anvils.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |