US3733949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise reduction strip for shear cut perforator
Assignee: Paper Converting Machine Co
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Filing: 1971-06-21
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Granted: 1973-05-22
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Expires: 1991-06-21
Abstract
Abstract A shear cut perforator having an axially recessed bedroll equipped with resilient roll blades for engagement with and flexing by an anvil blade is provided with a resilient, compressible pad behind the flexing portion of the roll blade to reduce the noise level of the perforator.
Inventors
- 👤 J Bradley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:28
CPC Classifications
B; B26; B26D; B26D1/00; B26D1/01; B26D1/12; B26D1/25; B26D1/34; B26D1/38; B26D1/385; B23; B23Q; B23Q11/00; B23Q11/0078; B23Q11/0096; Y; Y10; Y10T; Y10T83/00; Y10T83/465; Y10T83/4766; Y10T83/4795; Y10T83/483; Y10T83/4844; Y10T83/4847; Y10T83/929; Y10T83/9372; Y10T83/9408
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
159 words
In a web perforating apparatus having a frame, a cutting bedroll mounted for rotation in the frame, and an anvil blade having a cutting edge mounted on the frame adjacent the bedroll, the bedroll having an axially extending recess in the surface thereof and a rigid bearing surface within the recess, a resilient roll blade rigidly supported on the bearing surface and having an inclined outwardly extending free portion provided with a cutting edge, the bedroll being provided with a further recess adjacent the outwardly extending free blade portion for relieving said free blade portion for flexing, and a resilient compressible pad within said further recess adjacent the roll blade, the cutting edge of tHe anvil blade being positioned radially inwardly of the path of travel of the cutting edge of the roll blade to bring the edges of the blades into engagement during rotation of the bedroll whereby the roll blade is flexed and the pad is compressed.
Claim 2
Dependent Claim
159 words
In a web perforating apparatus having a frame, a cutting bedroll mounted for rotation in the frame, and an anvil blade having a cutting edge mounted on the frame adjacent the bedroll, the bedroll having an axially extending recess in the surface thereof and a rigid bearing surface within the recess, a resilient roll blade rigidly supported on the bearing surface and having an inclined outwardly extending free portion provided with a cutting edge, the bedroll being provided with a further recess adjacent the outwardly extending free blade portion for relieving said free blade portion for flexing, and a resilient compressible pad within said further recess adjacent the roll blade, the cutting edge of tHe anvil blade being positioned radially inwardly of the path of travel of the cutting edge of the roll blade to bring the edges of the blades into engagement during rotation of the bedroll whereby the roll blade is flexed and the pad is compressed.
Claim 3
Dependent Claim
21 words
The apparatus of claim 1 in which the pad is substantially coextensive with the free blade portion of the roll blade.
Claim 4
Dependent Claim
19 words
The apparatus of claim 1 in which the roll blade and the pad are of approximately the same thickness.
Claim 5
Dependent Claim
33 words
The apparatus of claim 1 in which the depth of the further recess in a direction normal to the plane of the roll blade is slightly greater than the thickness of the pad.
Claim 6
Dependent Claim
47 words
The apparatus of claim 4 in which the difference between the depth of the further recess and the thickness of the pad is about one-half of the distance through which the cutting edge of the roll blade is flexed into the further recess by the anvil blade.
Claim 7
Dependent Claim
29 words
The apparatus of claim 1 in which the pad is compressed by about 10 percent to about 30 percent of its thickness by the flexing of the roll blade.
Claim 8
Dependent Claim
36 words
The apparatus of claim 1 in which the said further recess has a depth normal to the plane of the roll blade of about 0.040 inch and the pad has a thickness of about 0.035 inch.
Claim 9
Dependent Claim
33 words
The apparatus of claim 7 in which the cutting edge of the roll blade is flexed by the anvil blade a distance of about 0.010 inch from the plane of the roll blade.
Claim 10
Dependent Claim
21 words
The apparatus of claim 1 in which the anvil blade extends at an angle of about 2.8* to the roll blade.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |