US3726458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the intermittent feed of a width of material
Assignee: Akkumulatorenfabrik Dr Leopold Jungfer
•
Filing: 1971-07-12
•
Granted: 1973-04-10
•
Expires: 1991-07-12
Abstract
Abstract A feed device for strip material has a reciprocable arm which is moved in a feed direction by a first pneumatic ram and in a return direction by a second pneumatic ram. The arm has a clamp for holding the material during feed movement and a further clamp located at the end of the feed movement of the arm to hold the material during return movement of the ram. The first ram has a stop for limiting the feed movement and the second ram has both a stop for limiting return movement and a device for braking movement of the member towards the end of the return movement.
Inventors
- 👤 R Rabl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:30
CPC Classifications
B; B26; B26D; B26D1/00; B21; B21D; B21D43/00; B21D43/02; B21D43/04; B21D43/10; B21D43/11; B26D1/01; B26D1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
263 words
A device for the intermittent feed of a width of material, for use in connection with a machine tool, comprising an entrainment member reciprocable between an initial position and a feed position, a first clamping device mounted on the entrainment member for clamping the material against the entrainment member during movement of the entrainment member towards the feed position, a second clamping device, means to mount the second clamping device adjacent the feed position of the entrainment device for clamping the material during the return movement of the entrainment member, a first pneumatic ram connected to the membeR for moving the member towards the feed position, the ram having stop means for stopping the member at the feed position and a second pneumatic ram connected to the entrainment member, the second ram having means to brake movement of the member towards the initial position and stop means to stop the member at the initial position and a device for adjusting the relative position of the two rams whereby feed travel of the member can be varied, a control circuit of the machine tool provided with a pneumatically actuated step-by-step switch which switch is arranged between an air impulse valve and a reversing valve for the operation and return movement of the machine tool, which switch, with each air impulse arriving via the air impulse valve, is indexed by a predetermined amount and is ready to actuate the control circuit of the reversing valve for the purpose of initiating a working stroke, after a predetermined or selectable number of air impulses have been received.
Claim 2
Independent Claim
263 words
A device for the intermittent feed of a width of material, for use in connection with a machine tool, comprising an entrainment member reciprocable between an initial position and a feed position, a first clamping device mounted on the entrainment member for clamping the material against the entrainment member during movement of the entrainment member towards the feed position, a second clamping device, means to mount the second clamping device adjacent the feed position of the entrainment device for clamping the material during the return movement of the entrainment member, a first pneumatic ram connected to the membeR for moving the member towards the feed position, the ram having stop means for stopping the member at the feed position and a second pneumatic ram connected to the entrainment member, the second ram having means to brake movement of the member towards the initial position and stop means to stop the member at the initial position and a device for adjusting the relative position of the two rams whereby feed travel of the member can be varied, a control circuit of the machine tool provided with a pneumatically actuated step-by-step switch which switch is arranged between an air impulse valve and a reversing valve for the operation and return movement of the machine tool, which switch, with each air impulse arriving via the air impulse valve, is indexed by a predetermined amount and is ready to actuate the control circuit of the reversing valve for the purpose of initiating a working stroke, after a predetermined or selectable number of air impulses have been received.
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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |