US3916742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet cutting
Assignee: Individual
•
Filing: 1973-12-17
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Granted: 1975-11-04
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Expires: 1993-12-17
Abstract
Abstract A method of and apparatus for cutting a sheet into sections of predetermined length. The cutting means is a cross cutting shears disposed upstream of a tilting table which is longitudinally displaceable. In a first feed step, a sheet to be cut is fed between the shears so that a sheet length preferably slightly less than the predetermined length extends upstream of the shears. This actual length of sheet is then compared with the predetermined length and in the event of an error signal the sheet is clamped on to the tilting table and the latter displaced longitudinally away from the shears until the actual sheet length coincides with the predetermined sheet length whereupon the shears are operated.
Inventors
- 👤 Oskar Karl Biernot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:08
CPC Classifications
B; B21; B21D; B21D43/00; B21D43/28; Y; Y10; Y10T; Y10T83/00; Y10T83/04; Y10T83/0448; Y10T83/0467; Y10T83/141; Y10T83/148; Y10T83/202; Y10T83/2074; Y10T83/2081; Y10T83/2092; Y10T83/2198; Y10T83/444; Y10T83/4564; Y10T83/4567; Y10T83/463; Y10T83/525; Y10T83/531
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
121 words
A method of cutting a sheet into sections of predetermined length, comprising advancing the sheet longitudinally between cross cutting shears until and actual length of sheet not greater than said predetermined length is located downstream of said shears and rests on a longitudinally displaceable tilting table, automatically comparing said predetermined and actual lengths to produce an error signal in the event of the actual length being less than the predetermined length, and, on occurrence of an error signal, clamping the sheet on the tilting table and displacing the tilting table longitudinally away from the cross cutting shears until the actual length coincides with the predetermined length whereupon the shears are operated to cut the section of predetermined length from the sheet.
Claim 2
Independent Claim
121 words
A method of cutting a sheet into sections of predetermined length, comprising advancing the sheet longitudinally between cross cutting shears until and actual length of sheet not greater than said predetermined length is located downstream of said shears and rests on a longitudinally displaceable tilting table, automatically comparing said predetermined and actual lengths to produce an error signal in the event of the actual length being less than the predetermined length, and, on occurrence of an error signal, clamping the sheet on the tilting table and displacing the tilting table longitudinally away from the cross cutting shears until the actual length coincides with the predetermined length whereupon the shears are operated to cut the section of predetermined length from the sheet.
Claim 3
Dependent Claim
131 words
Apparatus for cutting a sheet into sections of predetermined length, comprising a pair of cross cutting shears, a longitudinally displaceable tilting table downstream of said shears, a bed of driven rollers on said table, drive means for advancing said sheet between said shears and onto said table in a first feed step, means for measuring the actual length of sheet extending downstream of the shears after said first feed step, comparison means for comparing the measured actual length with said predetermined length, clamping means for clamping the sheet onto said table in the event of an error signal from said comparison means, and drive means for displacing the table longitudinally so as to perform a second feed step of the sheet after which said actual length coincides with the predetermined length.
Claim 4
Dependent Claim
131 words
Apparatus for cutting a sheet into sections of predetermined length, comprising a pair of cross cutting shears, a longitudinally displaceable tilting table downstream of said shears, a bed of driven rollers on said table, drive means for advancing said sheet between said shears and onto said table in a first feed step, means for measuring the actual length of sheet extending downstream of the shears after said first feed step, comparison means for comparing the measured actual length with said predetermined length, clamping means for clamping the sheet onto said table in the event of an error signal from said comparison means, and drive means for displacing the table longitudinally so as to perform a second feed step of the sheet after which said actual length coincides with the predetermined length.
Claim 5
Dependent Claim
60 words
Apparatus as claimed in claim 2, wherein first actual length measuring means are provided upstream of the shears and second actual length measuring means are provided downstream of the shears for completing the measurement of said actual length in the event of the sheet leaving the vicinity of said first measuring means before the end of said first feed step.
Claim 6
Dependent Claim
26 words
Apparatus as claimed in claim 2, wherein the clamping means comprises a magnet mounted for application the lower surface of the sheet on the tilting table.
Claim 7
Dependent Claim
59 words
Apparatus according to Claim 2 with a hydraulic displacement drive for the tilting table with which is associated a hydraulic control circuit for the reversible actuation of the displacement drive over the entire displacement, and the supply or discharge of pressure medium being automatically closed off when a zero comparison between the desired and actual feed length is achieved.
References Cited (Backward Citations)
US3600992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |