US3877333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet locating device
Assignee: Ilford Imaging UK Ltd
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Filing: 1973-11-06
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Granted: 1975-04-15
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Expires: 1993-11-06
Abstract
Abstract Method of performing a cross cutting operation on a travelling flexible web of material to form discrete sheets of material followed by an operation on the trailing edge of the thus formed severed sheet of material, which method comprises moving the leading edge of the web to a clamping station, clamping the leading edge of the web, cross cutting the web to form a severed sheet of the flexible web material, causing the middle of the severed sheet to bow in a pre-determined curvature whilst maintaining the trailing edge of the sheet parallel to the position in which it was cross cut, thus causing the trailing edge of the sheet to move towards the leading edge of the sheet by a pre-determined distance and then performing the operation on the trailing edge of the severed sheet.
Inventors
- 👤 Edward Albert Erne Illingworth
- 👤 Eric Stone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:27
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/765; G03D; G03D15/00; G03D15/04; G03D15/043; G03D15/046; Y; Y10; Y10T; Y10T83/00; Y10T83/04; Y10T83/0405; Y10T83/0419; Y10T83/0443; Y10T83/0505; Y10T83/0524; Y10T83/444; Y10T83/4564; Y10T83/4567; Y10T83/4645; Y10T83/647; Y10T83/6572
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
137 words
A method of performing a cross cutting operation on a travelling flexible web of material to form discrete sheets of material followed by an operation on the trailing edge of the thus formed severed sheet of material, which method comprises moving the leading edge of the web to a clamping station, clamping the leading edge of the web, cross cutting the web to form a severed sheet of the flexible web material, causing the middle of the severed sheet to bow in a pre-determined curvature whilst maintaining the trailing edge of the sheet parallel to the position in which it was cross cut, thus causing the trailing edge of the sheet to move towards the leading edge of the sheet by a pre-determined distance and then performing the operation on the trailing edge of the severed sheet.
Claim 2
Independent Claim
137 words
A method of performing a cross cutting operation on a travelling flexible web of material to form discrete sheets of material followed by an operation on the trailing edge of the thus formed severed sheet of material, which method comprises moving the leading edge of the web to a clamping station, clamping the leading edge of the web, cross cutting the web to form a severed sheet of the flexible web material, causing the middle of the severed sheet to bow in a pre-determined curvature whilst maintaining the trailing edge of the sheet parallel to the position in which it was cross cut, thus causing the trailing edge of the sheet to move towards the leading edge of the sheet by a pre-determined distance and then performing the operation on the trailing edge of the severed sheet.
Claim 3
Dependent Claim
43 words
A method according to claim 1 wherein the middle of the severed sheet of flexible web material is caused to bow by means of air pressure forcing the middle of the severed sheet into a space located on one side of the sheet.
Claim 4
Dependent Claim
28 words
A method according to claim 1 wherein the middle of the severed sheet is caused to bow by making it conform to the shape of a concave block.
Claim 5
Dependent Claim
52 words
A method according to claim 3 wherein the sheet is made to conform to the shape of a concave block by means of a convex block which is of the same curvature as the said concave block and which forces the middle of the sheet into the middle of the concave block.
Claim 6
Dependent Claim
57 words
A method according to claim 4 wherein the convex block has a flat shoulder member which clamps the severed sheet to a flat portion of the platform holding its free end flat and parallel to the position in which it was cross-cut after the convex blocks forces the middle of the severed sheet into the concave block.
Claim 7
Dependent Claim
49 words
A method according to claim 4 wherein a clamp clamps the severed sheet to a flat portion of the platform holding its free end flat and parallel in the position in which it was cross-cut, after the convex block forces the middle of the sheet into the concave blocks.
Claim 8
Dependent Claim
20 words
A method according to claim 4 wherein both the convex block and the concave block are covered with protective material.
Claim 9
Dependent Claim
14 words
A method according to claim 7 wherein the protective material is looped nylon velvet.
Claim 10
Independent Claim
121 words
A method of preparing round-cornered photosensitive film sheets from a web of photosensitive film material, which method comprises moving the leading edge of the web to a clamping station, clamping the leading edge of the web, removing the corners of the leading edge of the web, cross-cutting the web to form a severed sheet of film, causing the middle of the severed sheet to bow in a predetermined curvature whilst maintaining the trailing edge of the severed sheet parallel to the position in which it was cross-cut, thus causing the trailing edge of the sheet to move towards the leading edge of the sheet by a pre-determined amount and then removing the corners from the trailing edge of the severed sheet.
Claim 11
Independent Claim
121 words
A method of preparing round-cornered photosensitive film sheets from a web of photosensitive film material, which method comprises moving the leading edge of the web to a clamping station, clamping the leading edge of the web, removing the corners of the leading edge of the web, cross-cutting the web to form a severed sheet of film, causing the middle of the severed sheet to bow in a predetermined curvature whilst maintaining the trailing edge of the severed sheet parallel to the position in which it was cross-cut, thus causing the trailing edge of the sheet to move towards the leading edge of the sheet by a pre-determined amount and then removing the corners from the trailing edge of the severed sheet.
Claim 12
Dependent Claim
21 words
A method according to claim 9 wherEin the four corners of the sheet of film are removed by a punching operation.
Claim 13
Dependent Claim
40 words
A method according to claim 9 wherein the middle of the severed sheet is caused to bow in a predetermined curvature by a convex block which forces the middle of the sheet into a concave block of the same curvature.
Claim 14
Dependent Claim
19 words
A method according to claim 11 wherein both the convex and the concave blocks are covered with protective material.
Claim 15
Dependent Claim
14 words
A method according to claim 12 wherein the protective material is looped nylon velvet.
Claim 16
Dependent Claim
42 words
A method according to claim 1 wherein the middle of the severed sheet of flexible web material is caused to bow by means of suction forcing the middle of the severed sheet into a space located on one side of the sheet.
Claim 17
Dependent Claim
42 words
A method according to claim 1 wherein the middle of the severed sheet of flexible web material is caused to bow by a mechanical means forcing the middle of the severed sheet into a space located on one side of the sheet.
Claim 18
Independent Claim
183 words
An apparatus for cross-cutting and round-cornering webs of flexible material into discrete sheets each of which have round corners, which apparatus comprises a platform over which a travelling web of material is caused to move, a clamping means located on the platform for clamping the leading edge of the flexible web material, a web cross cutting means, a concave shaped block located on one side of the path of the web between the said clamping means and the said cross cutting means, and on the reverse side of the web from the said concave block a convex block having the same curvature as the concave block and which is located in register with the said concave block, and means to enable the convex block to locate in the concave block thereby causing a sheet of web therebetween to bow in a pre-determined curvature, there being provided clamping means which, in operation, serve to clamp the film holding it flat and parallel to the position in which it is cut, together with punching means for round-cornering each of the four corners of the sheet.
Claim 19
Independent Claim
183 words
An apparatus for cross-cutting and round-cornering webs of flexible material into discrete sheets each of which have round corners, which apparatus comprises a platform over which a travelling web of material is caused to move, a clamping means located on the platform for clamping the leading edge of the flexible web material, a web cross cutting means, a concave shaped block located on one side of the path of the web between the said clamping means and the said cross cutting means, and on the reverse side of the web from the said concave block a convex block having the same curvature as the concave block and which is located in register with the said concave block, and means to enable the convex block to locate in the concave block thereby causing a sheet of web therebetween to bow in a pre-determined curvature, there being provided clamping means which, in operation, serve to clamp the film holding it flat and parallel to the position in which it is cut, together with punching means for round-cornering each of the four corners of the sheet.
Claim 20
Dependent Claim
19 words
Apparatus according to claim 16 wherein both the concave block and the convex block are covered with protective material.
Claim 21
Dependent Claim
14 words
Apparatus according to claim 16 which further comprises a pair of driven nip rollers.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |