Patent US3703841A successfully refreshed from Google Patents.
US3703841A
Expired / Lapsed
US
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Rotary shear for wrapping machines
Assignee: FMC Corp
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Filing: 1970-02-02
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Granted: 1972-11-28
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Expires: 1990-02-02
Abstract
Abstract A wrapping machine cutting head of the rotary shear type wherein the lateral contact force between the shearing blades is effected by a camming surface, integral with one of the shearing blades, to laterally flex a resiliently flexible blade against a rigid blade as the two blades move into shearing relation with each other and with the web material intermediate two interconnected packages wrapped and sealed in the web.
Inventors
- 👤 Donald C Crawford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:09
CPC Classifications
B; B26; B26D; B26D1/00; B26D1/0006; B26D1/56; B26D1/62; B26D1/626; B65; B65B; B65B61/00; B65B61/04; B65B61/06; B65B61/08; B26D2001/006; B26D2001/0066; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C65/24; B29C65/30; B29C65/305; B29C65/74; B29C65/745; B29C65/7461; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/4312; B29C66/80; B29C66/81; B29C66/814; B29C66/8141; B29C66/81411; B29C66/81421; B29C66/81422; B29C66/816; B29C66/8161; B29C66/83; B29C66/834; B29C66/8351; B29C66/83511; B29C66/83513; B29C66/84; B29C66/849; Y; Y10; Y10T; Y10T83/00; Y10T83/465; Y10T83/4766; Y10T83/4795; Y10T83/4824; Y10T83/483; Y10T83/4836; Y10T83/4844; Y10T83/929; Y10T83/9372; Y10T83/9396; Y10T83/9399
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
159 words
In a wrapping machine, a progressive-cut web shear mechanism comprising: a flat, resilient shearing blade, a rigid rectilinear shearing blade, rotatable shaft means rigidly mounting said resilient blade therein substantially radially thereof in flat and normally unstressed relation with the major portion of said blade exposed for resilient flexure, rotatable shaft means rigidly mounting said rigid blade therein substantially radially thereof for cooperation with said resilient blade, means for cyclically driving said rotatable shaft means and thereby said blades into and out of overlapping shearing engagement, and, a camming surface on one of said blades for laterally stressing and flexing one end portion of said resilient blade as the blades initially overlap, said stressing establishing a predetermined and localized shearing force between said blades adjacent said camming surface, continued shearing movement of said blades causing progressive lateral localized flexure of said resilient blade to maintain a uniform shearing force for severing a web of wrapping material intermediate said blades.
Claim 2
Dependent Claim
159 words
In a wrapping machine, a progressive-cut web shear mechanism comprising: a flat, resilient shearing blade, a rigid rectilinear shearing blade, rotatable shaft means rigidly mounting said resilient blade therein substantially radially thereof in flat and normally unstressed relation with the major portion of said blade exposed for resilient flexure, rotatable shaft means rigidly mounting said rigid blade therein substantially radially thereof for cooperation with said resilient blade, means for cyclically driving said rotatable shaft means and thereby said blades into and out of overlapping shearing engagement, and, a camming surface on one of said blades for laterally stressing and flexing one end portion of said resilient blade as the blades initially overlap, said stressing establishing a predetermined and localized shearing force between said blades adjacent said camming surface, continued shearing movement of said blades causing progressive lateral localized flexure of said resilient blade to maintain a uniform shearing force for severing a web of wrapping material intermediate said blades.
Claim 3
Dependent Claim
16 words
The wrapping machine of claim 1 wherein said camming surface is formed on said rigid blade.
Claim 4
Dependent Claim
16 words
The wrapping machine of claim 1 wherein said camming surface is formed on said resilient blade.
Claim 5
Dependent Claim
26 words
The wrapping machine of claim 1 wherein said resilient blade leads said rigid blade in the direction of movement of the interposed web of wrapping material.
Claim 6
Dependent Claim
26 words
The wrapping machine of claim 1 wherein said resilient blade trails said rigid blade in the direction of movement of the interposed web of wrapping material.
Claim 7
Dependent Claim
74 words
The wrapping machine of claim 1 wherein there is a gear mounted on each said shaft means and meshed with the gear of the other shaft means to provide counterrotation of said shafts, and wherein said blades following intersecting circular paths, so that the two blades overlap with one blade trailing the other, and wherein said camming surface extends beyond the pitch line of its associated gear for interference contact with the leading blade.
References Cited (Backward Citations)
US1398474A
Cited
US2125939A
Cited
US2478240A
Cited
US2640539A
Cited
US2738842A
Cited
US3084582A
Cited
US3086416A
Cited
US3224311A
Cited
US3247746A
Cited
US3507573A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |