US3721377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Web feeding apparatus
Assignee: Fujitsu Services Ltd
•
Filing: 1971-11-23
•
Granted: 1973-03-20
•
Expires: 1991-11-23
Abstract
Abstract For variation of the lateral positions of pairs of paper tractors, each tractor is slidable on a separate rack which is itself axially slidable. Coarse adjustment is according to preset positions of the tractors on the racks. Fine adjustment is by driving both racks of a pair of tractors together or driving only one of those racks.
Inventors
- 👤 C Atkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:09
CPC Classifications
B; B41; B41J; B41J11/00; B41J11/26; B41J11/32; B65; B65H; B65H20/00; B65H20/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
Web feeding apparatus comprising at least one pair of simultaneously drivable tractors for engaging opposite edges, respectively, of a web to be driven, each tractor being slidable on a different one of a pair of axially movable elongated members, means for locating each tractor at any one of a number of predetermined positions along its associated elongated member, and drive means including a first coupling for producing similar axial movement of both said members together and a second coupling for producing axial movement of one of said members separately.
Claim 2
Dependent Claim
89 words
Web feeding apparatus comprising at least one pair of simultaneously drivable tractors for engaging opposite edges, respectively, of a web to be driven, each tractor being slidable on a different one of a pair of axially movable elongated members, means for locating each tractor at any one of a number of predetermined positions along its associated elongated member, and drive means including a first coupling for producing similar axial movement of both said members together and a second coupling for producing axial movement of one of said members separately.
Claim 3
Dependent Claim
45 words
Apparatus according to claim 1, wherein the drive means includes a rotatable axially movable shaft of which a first portion has spaced circular grooves and a second portion has a spiral groove the portions meshing with a cooperatingly cut first pinion and second pinion, respectively.
Claim 4
Dependent Claim
18 words
Apparatus according to claim 2, comprising means for locking said shaft against axial movement when it is rotated.
Claim 5
Dependent Claim
27 words
Apparatus according to claim 3, wherein said means for locking comprises a geared drive coupling of predetermined inefficiency to a rotatable drive shaft bearing the second pinion.
Claim 6
Dependent Claim
38 words
Apparatus according to claim 4, wherein said drive shaft and another drive shaft bearing the first pinion each have a pinion meshing with a toothed rack portion of said other and said one of the elongated members, respectively.
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |