US4080856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary web chopper
Assignee: EIDP Inc
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Filing: 1976-05-24
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Granted: 1978-03-28
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Expires: 1996-05-24
Abstract
Abstract An apparatus for the high-speed transverse severing of equi-sized sheets from a running web utilizing interacting blades carried by power-driven counter-rotating shafts, with vacuum retention of the web on one shaft of the apparatus as carrier over substantially from the point of web input to the apparatus to at least the point of web severance.
Inventors
- 👤 Michael Hillas Shearon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:41
CPC Classifications
B; B26; B26D; B26D7/00; B26D7/01; B26D7/018; B26D1/00; B26D1/56; B26D1/62; B26D1/0006; B26D2001/002; B26D2001/0053; B26D2001/006; B26D2001/0066; Y; Y10; Y10T; Y10T83/00; Y10T83/202; Y10T83/2066; Y10T83/2068; Y10T83/207; Y10T83/465; Y10T83/4766; Y10T83/4795; Y10T83/483; Y10T83/4836; Y10T83/869; Y10T83/8789; Y10T83/8794; Y10T83/8795; Y10T83/929; Y10T83/9411; Y10T83/9447
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
196 words
A shear cutter for a running web comprising: a pair of axially co-parallel counter rotating shafts power driven in synchronism one with the other; said web being trained over said first shaft, said shafts having interacting blades for cutting said web, the first shaft of said pair being provided over a major expanse of its periphery with a multiplicity of web retaining vacuum ports and at least one peripheral inwardly extending recess within which is mounted a first of said blades, said first blade being a radially disposed straight edge blade having a cutting edge located near the outside perimeter of said first shaft; control means operating in a predetermined time sequence relative to the rotation of said shafts repetitively imposing preselected time durations for vacuum web retention; means mounted within said recess and responsive to said control means for effecting, in seriatim, vacuum retention of the leading edge of said web during and after severance thereof, followed by means relieving said vacuum retention proximal to said leading edge following each said cut, thereby to release said leading edge; and means stripping said leading edge at a preselected delivery point for severed sheets of said web.
Claim 2
Dependent Claim
196 words
A shear cutter for a running web comprising: a pair of axially co-parallel counter rotating shafts power driven in synchronism one with the other; said web being trained over said first shaft, said shafts having interacting blades for cutting said web, the first shaft of said pair being provided over a major expanse of its periphery with a multiplicity of web retaining vacuum ports and at least one peripheral inwardly extending recess within which is mounted a first of said blades, said first blade being a radially disposed straight edge blade having a cutting edge located near the outside perimeter of said first shaft; control means operating in a predetermined time sequence relative to the rotation of said shafts repetitively imposing preselected time durations for vacuum web retention; means mounted within said recess and responsive to said control means for effecting, in seriatim, vacuum retention of the leading edge of said web during and after severance thereof, followed by means relieving said vacuum retention proximal to said leading edge following each said cut, thereby to release said leading edge; and means stripping said leading edge at a preselected delivery point for severed sheets of said web.
Claim 3
Dependent Claim
31 words
The apparatus of claim 1 in which said control means further includes means for effecting the ejection of said running web from said first shaft following release of said running web.
Claim 4
Dependent Claim
45 words
A shear cutter for a running web according to claim 2 wherein said web ejection means comprises outwardly directed jets through which pressurized air is discharged against the underside of said web leading edge during a preselected portion of the rotational cycle of said shafts.
Claim 5
Dependent Claim
45 words
A shear cutter for a running web according to claim 1 in which said means for stripping said leading edge of said web at said preselected delivery point for severed sheets comprises air jets trained to direct air to the underside of said leading edge.
Claim 6
Dependent Claim
77 words
A shear cutter for a running web according to claim 2 wherein said means for effecting, in seriatim, said vacuum retention, release, and stripping of the leading edge of said web comprises a manifold disposed in each said first shaft recess opening into a plurality of orifices, the axes of said orifices being directed outward, with inlet and outlet ports aligned generally parallel to said straightedge blade cutting edge, and means supplying pressurized air to said manifold.
Claim 7
Dependent Claim
84 words
A shear cutter for a running web according to claim 5 in which said air jets additionally comprise a fixed air knife jet means located proximal to said first shaft periphery, in the vicinity of said delivery point, said knife being provided with a plurality of orifices aligned generally tangential to said first shaft periphery and directed opposite to the shaft sense of rotation, and means supplying pressurized air to said orifices to assist in lifting said severed leading web end from said periphery.
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) | 1981-03-27 | 1981-09-26 | 1982-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-27 | 1985-09-26 | 1986-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-27 | 1989-09-26 | 1990-03-28 | $7700.00 | Window Closed / Lapsed |