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US3830419A Expired / Lapsed US ⏱️ 0.0 years remaining

Tapered roller transport mechanism for web of photographic materials and the like

Assignee: Pako Corp
•
Filing: 1973-08-24
•
Granted: 1974-08-20
•
Expires: 1993-08-24
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Abstract

Abstract The tapered rollers of this web transport mechanism are specifically constructed and arranged to apply driving force to only the marginal edge portions of the web being transported to minimize the possibility of scratching and pressure marking of the central image-bearing sensitized surface of the web and also maintain frictional driving contact without close fitting tolerance between each pair of rollers. The mechanism includes a plurality of pairs of oppositely tapered rollers having opposed surfaces spaced apart a distance slightly greater than the thickness of the web to be transported, the rollers of adjacent pairs being oppositely tapered and arranged to alternately offset the marginal edge portions of the web path defined thereby and produce a zigzag, twisting action on the web to cause the frictional driving pressure to be exerted only on the marginal edge portions of said web and also permit a spacing wider than the web thickness be maintained between each pair of rollers.

Inventors

  • 👤 C Lee

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 12:04
CPC Classifications
B; B65; B65H; B65H20/00; B65H20/02; B65H23/00; B65H23/04; B65H23/26; G; G03; G03D; G03D3/00; G03D3/08; G03D3/13; G03D3/132; B65H2404/00; B65H2404/10; B65H2404/14; B65H2404/147

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 105 words
A transport mechanism for elongated webs of sheet material comprising a roller supporting structure, a plurality of pairs of tapered transport rollers mounted on said structure, the spacing between the rollers of each pair being greater than the thickness of the web being transported, the taper of each roller being opposite to its adjacent rollers and said rollers being oriented to produce a zigzag path for the marginal edge portions of a web of material being transported through said rollers, and means for driving said rollers to produce the movement of such web through the spacing between the respective pairs along the desired web path.
Claim 2
Dependent Claim 105 words
A transport mechanism for elongated webs of sheet material comprising a roller supporting structure, a plurality of pairs of tapered transport rollers mounted on said structure, the spacing between the rollers of each pair being greater than the thickness of the web being transported, the taper of each roller being opposite to its adjacent rollers and said rollers being oriented to produce a zigzag path for the marginal edge portions of a web of material being transported through said rollers, and means for driving said rollers to produce the movement of such web through the spacing between the respective pairs along the desired web path.
Claim 3
Dependent Claim 27 words
The structure set forth in claim 1 wherein the axes of rotation of the rollers are parallel and define the center line of desired web path therebetween.
Claim 4
Dependent Claim 34 words
The structure set forth in claim 2 and said web path having a number of U-shaped loops with an even number of pairs of rollers disposed at the closed curved portion of each loop.
Claim 5
Dependent Claim 49 words
The structure set forth in claim 2 and the number of pairs of rollers for all of the respective conditions encountered along the web path being an even number to avoid any tendency of the tapered rollers to move the web off the center line of its desired path.
Claim 6
Dependent Claim 46 words
The structure set forth in claim 1 and a number of liquid confining tanks through which the web is transported and a pair of soft yieldable squeegee rollers at the exit end of each tank to remove substantially all of the liquid from the web surfaces.
Claim 7
Dependent Claim 103 words
The structure set forth in claim 1 and adjacent pairs of rollers being oriented to produce a web path center portion through which a substantial central image-bearing area of the web is free from contact with said rollers, the web diagonally transversing the width of the space between each pair of rollers with the marginal edge portion of one side of the web in frictional driving contact with a larger portion of one of said rollers and the marginal edge portion of the other side of the web in frictional driving contact with a larger portion of the other roller of each pair.

References Cited (Backward Citations)

US2742143A Cited
US3520461A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-08-19 1978-02-18 1978-08-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-08-19 1982-02-18 1982-08-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-08-19 1986-02-18 1986-08-20 $7700.00 Window Closed / Lapsed

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