Patent US4029247A successfully refreshed from Google Patents.
US4029247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strip feeding mechanism
Assignee: Pako Corp
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Filing: 1975-08-25
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Granted: 1977-06-14
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Expires: 1995-08-25
Abstract
Abstract A feeding mechanism for supplying elongated strips of material, such as photographic print paper and the like, in a tension-free state by use of a slack loop of said material, the size of which varies in response to the demands of a processing machine. Said loop actuates a switch for energizing and deenergizing a drive mechanism for supplying said loop from a supply roll so that the size of the slack loop directly controls the supply mechanism.
Inventors
- 👤 Douglas M. Sakariason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:50
CPC Classifications
B; B65; B65H; B65H20/00; B65H20/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
221 words
A device for supplying a relatively stiff strip of photographic print paper from a roll in response to the demand of a machine for processing said strip comprising, a drive roller for withdrawing the strip of photographic print paper from the supply roll, a pressure roller for maintaining a positive driving connection between the strip and said drive roller, an electric motor connected to said drive roller, circuit means for supplying electric power to said motor, an electric switch in said circuit means for controlling the electric power to said motor, a generally U-shaped guide plate positively defining a loop guide path for said strip downstream from said drive roller to engage the strip from said drive roller and positively form a doubled back tension free slack loop downstream from drive roller, said plate having an opening therein, a loop sensing switch-actuating element extending through said plate opening and connected to said switch for controlling actuation thereof and mounted in said guide path for sensing the presence of said loop and positioned to close said switch when said loop becomes shorter than a predetermined length, and opening said switch when said loop becomes longer than a predetermined length, and means for receiving the tension free portion of the strip from said loop and guiding the portion into the machine for processing.
Claim 2
Independent Claim
221 words
A device for supplying a relatively stiff strip of photographic print paper from a roll in response to the demand of a machine for processing said strip comprising, a drive roller for withdrawing the strip of photographic print paper from the supply roll, a pressure roller for maintaining a positive driving connection between the strip and said drive roller, an electric motor connected to said drive roller, circuit means for supplying electric power to said motor, an electric switch in said circuit means for controlling the electric power to said motor, a generally U-shaped guide plate positively defining a loop guide path for said strip downstream from said drive roller to engage the strip from said drive roller and positively form a doubled back tension free slack loop downstream from drive roller, said plate having an opening therein, a loop sensing switch-actuating element extending through said plate opening and connected to said switch for controlling actuation thereof and mounted in said guide path for sensing the presence of said loop and positioned to close said switch when said loop becomes shorter than a predetermined length, and opening said switch when said loop becomes longer than a predetermined length, and means for receiving the tension free portion of the strip from said loop and guiding the portion into the machine for processing.
Claim 3
Dependent Claim
17 words
The apparatus set forth in claim 1 and said drive roller comprised of a high friction material.
Claim 4
Dependent Claim
61 words
The apparatus set forth in claim 2 and said means for maintaining a positive driving connection between the strip and said drive roller comprising a pressure roller positioned in generally opposed relation to said drive roller and resiliently urged towards the strip positioned between said drive and pressure rollers to maintain frictional drive contact of the strip by said drive roller.
Claim 5
Dependent Claim
48 words
The apparatus set forth in claim 3 and self-threading means comprising a threading guide plate positioned in downwardly sloping relation on the upstream side of said drive and pressure rollers to initially guide the leading end of the strip between said rollers and into said loop guide path.
Claim 6
Dependent Claim
43 words
The structure set forth in claim 3 and release means connected to said pressure roller for retracting the same against the resilient pressure applying force thereof and thereby permit the end of said strip to be initially fed through said loop guide path.
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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |