US3568595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making letterpress plates
Assignee: Mccall Corp
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Filing: 1967-08-28
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Granted: 1971-03-09
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Expires: 1987-08-28
Abstract
Abstract A hydraulic press supporting a lower press member including a center and end sections each having an internal passageway and with an engraved master plate mounted on the center section, an automatically controlled system for circulating cooling fluid through the passageways in the end sections and alternately circulating cooling and heating fluid through the passageway in the center section for preheating and cooling the plates, a thermoplastic sheet of material pressed against the preheated plate by an upper press member having a resilient blanket and held until the plate and sheet are cooled, and a frame slidably mounted on the lower press member for shifting the sheet a predetermined distance to form a flexible mat having a pair of identical impressions in precise registration for use in producing a two-on plate for a letterpress.
Inventors
- 👤 Charles W Bunting
- 👤 David P Groeber
- 👤 Louis W Pettlo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:04
CPC Classifications
B; B41; B41C; B41C3/00; B41C3/08; B41C3/06; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1028; Y10T156/1033; Y10T156/1039; Y10T156/1052; Y10T156/108
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
181 words
Apparatus for use in making a multiple impression plate for a letterpress, comprising a first press member having a surface for receiving a master plate with a predetermined face, a frame member slidably mounted on said first press member and having means for engaging a sheet of thermoplastic material, stop means effecting precise predetermined movement of said frame member relative to said first press member to provide for selective shifting of said sheet between first and second positions to locate first and second portions of said sheet over said face of said master plate, means for preheating each of the sheet portions disposed over said face, a second press member spaced from said first press member, press means providing relative linear movement between said first and second press members for pressing each portion of the sheet against said face to mold an impression within each portion of the sheet, and means for cooling each portion of the sheet to form a mat having two identical impressions each conforming to said face of said master plate and arranged in precise predetermined registration.
Claim 2
Dependent Claim
181 words
Apparatus for use in making a multiple impression plate for a letterpress, comprising a first press member having a surface for receiving a master plate with a predetermined face, a frame member slidably mounted on said first press member and having means for engaging a sheet of thermoplastic material, stop means effecting precise predetermined movement of said frame member relative to said first press member to provide for selective shifting of said sheet between first and second positions to locate first and second portions of said sheet over said face of said master plate, means for preheating each of the sheet portions disposed over said face, a second press member spaced from said first press member, press means providing relative linear movement between said first and second press members for pressing each portion of the sheet against said face to mold an impression within each portion of the sheet, and means for cooling each portion of the sheet to form a mat having two identical impressions each conforming to said face of said master plate and arranged in precise predetermined registration.
Claim 3
Dependent Claim
80 words
Apparatus as defined in claim 1 including means defining a fluid passageway within said first press member in close spaced relation to said surface, automatic control means for alternately circulating heating and cooling fluid through said passageway to effect said heating and cooling of each portion of the sheet, and means for sensing the temperature of said first press member to provide for switching between heating and cooling fluid in response to predetermined temperature of said master plate said sheet.
Claim 4
Dependent Claim
55 words
Apparatus as defined in claim 1 wherein said frame includes parallel spaced legs, means defining parallel spaced slots within said first press member and receiving said legs, and a pin projecting upwardly from each said leg for receiving a corresponding hole formed within said sheet to locate said sheet in fixed relation to said frame.
Claim 5
Dependent Claim
105 words
Apparatus as defined in claim 1 wherein said first press member includes a center section between opposite end sections, said center section having said surface for receiving said master plate and including means defining a fluid passageway, means defining a separate fluid passageway within each said end section of said press member, said frame member being effective to position selectively each portion of the sheet over said center section and over one of said end sections, means for selectively circulating heating and cooling fluid through said passageway within said center section, and means for circulating cooling fluid through said passageway within each said end section.
Claim 6
Dependent Claim
40 words
ApparatuS as defined in claim 4 wherein said passageway within each said section has a serpentinelike configuration to direct fluid in such a manner to provide uniform heating and cooling of the corresponding said section of said first press member.
Claim 7
Dependent Claim
27 words
Apparatus as defined in claim 4 including means defining a slot within said first press member between adjacent said sections to minimize heat transfer between said sections.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |