US3774486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Feeding and cutting device
Assignee: Svenska Rotor Maskiner AB
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Filing: 1972-05-02
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Granted: 1973-11-27
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Expires: 1992-05-02
Abstract
Abstract A machine for cutting superposed layers of sheet material to successively form element plates of substantially continuously varying width for heat exchangers and for collecting said plates in stacked relationship, said machine including reciprocatable means for intermittently feeding desired lengths of superposed strips of sheet material to and beyond the shears of a shearing machine in timed relationship to the strokes of the shearing machine and means for stepwise varying the lengths of strips of sheet material fed to the shearing machine for each successive shearing operation.
Inventors
- 👤 B Johnsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:50
CPC Classifications
B; B21; B21D; B21D43/00; B21D43/28; B21D43/287; B21D43/02; B21D43/04; B21D43/10; B21D43/11; B21D53/00; B21D53/02; B21D53/04; Y; Y10; Y10T; Y10T83/00; Y10T83/444; Y10T83/4534; Y10T83/463; Y10T83/4632
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
148 words
A machine for cutting superposed layers of sheet material to successively form element plates of substantially continuously varying width for heat exchangers and for collecting the element plates thus formed into stacked relationship comprising: a shearing machine having shears, means for intermittently feeding superposed strips of sheet material in a substantially horizontal plane to and beyond the shears of said shearing machine in timed relationship to the strokes of said shears, said feeding means including a reciprocatable gripping device movable between an adjustable pick-up position and a fixed release position, means for step-wise varying the pick-up position of the reciprocatable gripping device for each successive shearing operation, and a stationary clamping device located between said release position of said gripping device and the shears of the shearing machine and adapted to hold said strips firmly during the shearing operation and during the return stroke of said gripping device.
Claim 2
Dependent Claim
148 words
A machine for cutting superposed layers of sheet material to successively form element plates of substantially continuously varying width for heat exchangers and for collecting the element plates thus formed into stacked relationship comprising: a shearing machine having shears, means for intermittently feeding superposed strips of sheet material in a substantially horizontal plane to and beyond the shears of said shearing machine in timed relationship to the strokes of said shears, said feeding means including a reciprocatable gripping device movable between an adjustable pick-up position and a fixed release position, means for step-wise varying the pick-up position of the reciprocatable gripping device for each successive shearing operation, and a stationary clamping device located between said release position of said gripping device and the shears of the shearing machine and adapted to hold said strips firmly during the shearing operation and during the return stroke of said gripping device.
Claim 3
Dependent Claim
23 words
A machine according to claim 1 wherein said fixed release position of said reciprocatable gripping device is defined by a fixed stop member.
Claim 4
Dependent Claim
99 words
A machine according to claim 1 wherein: said machine includes a stationary support membEr, said feeding means comprises a reciprocating slidable member carrying said gripping device and connected to one member of a servo motor, and an abutment member connected to the other member of said servo motor, said abutment member being adjustably connected to said stationary support member of the machine, and said means for step wise varying the pick-up position of the gripping means includes means for step wise varying the position of said abutment member relative to said stationary support member for each successive shearing operation.
Claim 5
Dependent Claim
40 words
A machine according to claim 3 wherein said step wide varying means includes a rotatable shaft coupling said abutment member to said stationary support member and means for turning said shaft by a given angle for each successive shearing operation.
Claim 6
Dependent Claim
72 words
A machine according to claim 4 wherein said rotatable shaft is rotatably journalled to said stationary support member, a first gear means connected to said rotatable shaft, and a second gear means coupled to said abutment member and in engagement with said first gear means, such that rotation of said first gear means, caused by rotation of said rotatable shaft, causes relative movement between said abutment member and said stationary support member.
Claim 7
Dependent Claim
62 words
A machine according to claim 4 wherein said step wide varying means includes a ratchet and pawl mechanism coupled to said rotatable shaft, said ratchet being fixed to said shaft and said pawl mechanism being operable to selectively allow rotation of said ratchet by a given angle dependent upon the pitch of the teeth of said ratchet for each successive shearing operation.
Claim 8
Dependent Claim
72 words
A machine according to claim 6 wherein said rotatable shaft is rotatably journalled to said stationary support member, a first gear means connected to said rotatable shaft, and a second gear means coupled to said abutment member and in engagement with said first gear means, such that rotation of said first gear means, caused by rotation of said rotatable shaft, causes relative movement between said abutment member and said stationary support member.
Claim 9
Dependent Claim
48 words
A machine according to claim 6 wherein said ratchet is a ratchet wheel, and wherein said pawl is disengaged from said ratchet wheel when said gripping device is in its fixed release position to enable said ratchet wheel to rotate by an amount corresponding to one tooth thereof.
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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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |