Patent US3746228A successfully refreshed from Google Patents.
US3746228A
Expired / Lapsed
US
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Tractor feeding device for marginally perforated webs
Assignee: International Business Machines Corp
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Filing: 1972-05-25
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Granted: 1973-07-17
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Expires: 1992-05-25
Abstract
Abstract A feeding device for marginally perforated webs of material in which pins for engaging the perforations are spaced about the periphery of an endless, toothed belt supported for rotation by a pair of toothed feed wheels rotating on parallel axes. The web is led over a cylindrically shaped guide surface in the area of engagement with the pins and the bridge supporting the belt is also cylindrically shaped. The radius (R1) of the guide surface in relation to the radius (R2) of the pitch circle of the belt corresponds to the relation of the perforation spacing (T1) of the web to the pitch (T2) of the pins on the belt (R1/R2 equal T1/T2). Also, the circumference of the circles with the radii R1 and R2 amounts to an integral multiple of the pitch T3 of the feed wheels (2 pi R1 X.T3 and 2 pi R2 X2.T3).
Inventors
- 👤 S Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:34
CPC Classifications
B; B65; B65H; B65H20/00; B65H20/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
123 words
In a device for feeding a web of material with marginal perforations of spacing T1 in which feeding is effected by pins engaging said perforations, said pins being spaced with a predetermined pitch T2 about the periphery of a toothed, flexible, endless belt supported between a pair of toothed feed wheels, the combination comprising: a member positioned between said feed wheels having a guide surface for said web, at least a portion of said guide surface being curved having a radius R1; a support element adjacent said member for supporting said belt with said pins and having a correspondingly curved portion aligned with said curved portion of said member with a radius R2; and said radii being in the relationship of R1/R2 T1/T2.
Claim 2
Dependent Claim
123 words
In a device for feeding a web of material with marginal perforations of spacing T1 in which feeding is effected by pins engaging said perforations, said pins being spaced with a predetermined pitch T2 about the periphery of a toothed, flexible, endless belt supported between a pair of toothed feed wheels, the combination comprising: a member positioned between said feed wheels having a guide surface for said web, at least a portion of said guide surface being curved having a radius R1; a support element adjacent said member for supporting said belt with said pins and having a correspondingly curved portion aligned with said curved portion of said member with a radius R2; and said radii being in the relationship of R1/R2 T1/T2.
Claim 3
Dependent Claim
31 words
The device as described in claim 1 wherein the circumferences of the circles with said radii R1 and R2 amount to an integral multiple of piTch T3 of said feed wheels.
Claim 4
Dependent Claim
33 words
A device as described in claim 1 wherein the curved portion of said member extends substantially the distance between said drive wheels and has a constant radius R1 over said entire curved portion.
Claim 5
Dependent Claim
34 words
A device as described in claim 3 wherein the curved portion of said support element parallels the curved portion of said member and also has a constant radius R2 that is less than R1.
Claim 6
Independent Claim
131 words
A device for feeding a web of material with marginal perforations of spacing T1 in which feeding is effected by pins engaging said perforations, comprising: a pair of rotable spaced, toothed feed wheels; an endless toothed belt on said feed wheels having pins extending therefrom to engage said perforations, said pins having a pitch T2 about said belt; a guide member between said wheels for supporting said web and having a cylindrically shaped surface of radius R1, said member having a slot therein; an element for supporting said belt adjacent said member so that said pins extend through said slot into said perforations, said element having a cylindrically curved support surface of radius T2 and being parallel to said member surface; and said radii being in the relationship of R1/R2 T1/T2.
Claim 7
Independent Claim
131 words
A device for feeding a web of material with marginal perforations of spacing T1 in which feeding is effected by pins engaging said perforations, comprising: a pair of rotable spaced, toothed feed wheels; an endless toothed belt on said feed wheels having pins extending therefrom to engage said perforations, said pins having a pitch T2 about said belt; a guide member between said wheels for supporting said web and having a cylindrically shaped surface of radius R1, said member having a slot therein; an element for supporting said belt adjacent said member so that said pins extend through said slot into said perforations, said element having a cylindrically curved support surface of radius T2 and being parallel to said member surface; and said radii being in the relationship of R1/R2 T1/T2.
Claim 8
Dependent Claim
30 words
A device as described in claim 5 wherein theteeth on said belt are on the interior major surface thereof and extend transversely of said belt less than the width thereof.
Claim 9
Dependent Claim
20 words
A device as described in claim 5 wherein said element surface diverges from said member adjacent each said feed wheel.
References Cited (Backward Citations)
US3347433A
Cited
US3688959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |