Patent US3771399A successfully refreshed from Google Patents.
US3771399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shear cut perforator
Assignee: FMC Corp
•
Filing: 1970-10-06
•
Granted: 1973-11-13
•
Expires: 1990-10-06
Abstract
Abstract This disclosure relates to a web perforating apparatus. Essentially the apparatus includes an unwind stand for supporting and unwinding a web of material, whether it be paper, foil or plastic, which is fed over a large rotating roll carrying circumferentially spaced rows of knives or blades which extend beyond the surface of the roll. A stationary rigid beam, coextensive with and adjacent the roll, support blocks mounting anvil blades or knives embedded in or surrounded by elastomeric material. The anvil knives make contact with the roll knives to effect perforation of the web.
Inventors
- 👤 J Aterianus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:23
CPC Classifications
B; B26; B26F; B26F1/00; B26F1/18; B26F1/20; B26D; B26D7/00; B26D7/26; B26D7/2628; B26D2007/2685; Y; Y10; Y10T; Y10T83/00; Y10T83/465; Y10T83/4766; Y10T83/4795; Y10T83/483; Y10T83/4844; Y10T83/929; Y10T83/9372; Y10T83/9396; Y10T83/9399
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
215 words
An apparatus for perforating thin, flexible sheet material such as paper, plastic or foil, said apparatus being of the type comprising a normally stationary anvil, means for mounting an anvil blade on said anvil, a bed roll mounting a rotary blade disposed at an acute angle to a radius of the roll so that only the leading edge of said rotary blade makes contact with an edge of said anvil blade, means for adjusting one of said blades to establish a predetermined amount of interference between said contacting blade edges, said means for mounting the anvil blade on said anvil comprising means forming an elongate slot in said anvil, and a body of elastomeric material in said slot for resiliently supporting two faces of said anvil blade, at least one face of said body of elastomeric material being unconfined along the extent of said blade in order to accommodate sidewise displacement of said anvil blade relative to said anvil when said rotary blade makes contact with said anvil blade; the improvement wherein there is no metal to metal contact between said anvil and said anvil blade on the side of the anvil blade that is urged sidewise toward the opposed wall of said anvil slot when said anvil blade is contacted by said rotary blade.
Claim 2
Independent Claim
215 words
An apparatus for perforating thin, flexible sheet material such as paper, plastic or foil, said apparatus being of the type comprising a normally stationary anvil, means for mounting an anvil blade on said anvil, a bed roll mounting a rotary blade disposed at an acute angle to a radius of the roll so that only the leading edge of said rotary blade makes contact with an edge of said anvil blade, means for adjusting one of said blades to establish a predetermined amount of interference between said contacting blade edges, said means for mounting the anvil blade on said anvil comprising means forming an elongate slot in said anvil, and a body of elastomeric material in said slot for resiliently supporting two faces of said anvil blade, at least one face of said body of elastomeric material being unconfined along the extent of said blade in order to accommodate sidewise displacement of said anvil blade relative to said anvil when said rotary blade makes contact with said anvil blade; the improvement wherein there is no metal to metal contact between said anvil and said anvil blade on the side of the anvil blade that is urged sidewise toward the opposed wall of said anvil slot when said anvil blade is contacted by said rotary blade.
Claim 3
Dependent Claim
22 words
The apparatus of claim 1, wherein said body of elastomeric material comprises a rubber member formed to releasably retain said anvil blade.
Claim 4
Independent Claim
144 words
An apparatus for performing thin flexible sheet material such as paper, plastic or foil of the type comprising a normally stationary anvil block having a slit therein, means mounting an anvil blade in said anvil block slot, a rotary blade having one of its edges located to make contact with an edge of said anvil blade, and means for adjusting one of said blades to establish a predetermined amount of interference between the edges thereof; the improvement comprising means supporting said anvil blade on an elastomeric foundation for causing biased multidirectional displacement of said anvil blade when its edge is contacted by the edge of the rotary blade to thereby maintain said edges in forceable engagement thereby effecting perforation of the sheet material, said anvil blade mounting means comprising a U-shaped rubber insert in said slot formed to receive and retain said anvil blade.
Claim 5
Independent Claim
144 words
An apparatus for performing thin flexible sheet material such as paper, plastic or foil of the type comprising a normally stationary anvil block having a slit therein, means mounting an anvil blade in said anvil block slot, a rotary blade having one of its edges located to make contact with an edge of said anvil blade, and means for adjusting one of said blades to establish a predetermined amount of interference between the edges thereof; the improvement comprising means supporting said anvil blade on an elastomeric foundation for causing biased multidirectional displacement of said anvil blade when its edge is contacted by the edge of the rotary blade to thereby maintain said edges in forceable engagement thereby effecting perforation of the sheet material, said anvil blade mounting means comprising a U-shaped rubber insert in said slot formed to receive and retain said anvil blade.
Claim 6
Dependent Claim
16 words
The apparatus of claim 3, wherein said rubber insert is bonded in said anvil block slot.
References Cited (Backward Citations)
US844171A
Cited
US1977283A
Cited
US2341503A
Cited
US2986058A
Cited
US3196724A
Cited
US3521514A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |