US3826442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling the tension on web material
Assignee: FL Smithe Machine Co Inc
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Filing: 1973-01-30
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Granted: 1974-07-30
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Expires: 1993-01-30
Abstract
Abstract Web material is unwound from a roll and supplied to a web unwind unit having a tension sensing mechanism mechanically connected thereto. The web material having a desired tension is drawn by an envelope machine drive at a first preselected linear speed through the web unwind unit into abutting contact with the tension sensing mechanism. The tension sensing mechanism includes a tension sensing roll arranged for rotation with an eccentrically supported shaft by a pair of tension arms. The tension sensing roll is arranged to apply a preselected pressure upon the web material so that the tension sensing roll responds to an increase in web tension by rotating with the tension arms in clockwise direction about the eccentrically supported shaft. The eccentrically supported shaft revolves in clockwise direction to move a pressure roll rotatably supported thereon toward a feed roll urging the web material into frictional engagement therebetween. The web material is fed by the pressure roll and the feed roll at an increased preselected linear speed to decrease the web tension. The tension sensing roll responds to a decrease in tension by rotating in counterclockwise direction with the tension arms. The eccentrically supported shaft also revolves in counterclockwise direction to release the web material from frictional engagement between the feed roll and the pressure roll restoring the web material to the slower preselected linear speed as provided by the envelope machine drive.
Inventors
- 👤 E Bethke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:02
CPC Classifications
B; B65; B65H; B65H23/00; B65H23/04; B65H23/18; B65H23/188; B65H23/1888; B65H2511/00; B65H2511/10; B65H2511/11; B65H2511/112
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
250 words
Apparatus for controlling the tension on web material comprising, a roll of web material rotatably supported to permit continuous unwinding of the web material from said roll, apparatus for further processing the web material in which the web material is arranged to move at a first preselected linear speed, an unwind means for intermittently feeding the web material at a second preselected linear speed to said apparatus for further processing the web material, said unwind means positioned adjacent said roll of web material so that the web material is supplied to said unwind means, said second preselected linear speed being higher than said first preselected linear speed, said unwind means includes a feed roll and a pressure roll positioned adjacent thereto, at least one of said rolls being driven at said second preselected linear speed, a tension sensing means for sensing the tension in a segment of the web material between said unwind means and said apparatus for further processing the web material, said tension sensing means positioned adjacent said pressure roll and operably connected thereto for moving the pressure roll toward and away from said feed roll so that said web material is frictionally engaged between said feed roll and said pressure roll so that said web material is fed to said apparatus for further processing the web material at said second preselected linear speed thereby maintaining desired tension in a segment of the web material between said unwind means and said apparatus for further processing the web material.
Claim 2
Dependent Claim
250 words
Apparatus for controlling the tension on web material comprising, a roll of web material rotatably supported to permit continuous unwinding of the web material from said roll, apparatus for further processing the web material in which the web material is arranged to move at a first preselected linear speed, an unwind means for intermittently feeding the web material at a second preselected linear speed to said apparatus for further processing the web material, said unwind means positioned adjacent said roll of web material so that the web material is supplied to said unwind means, said second preselected linear speed being higher than said first preselected linear speed, said unwind means includes a feed roll and a pressure roll positioned adjacent thereto, at least one of said rolls being driven at said second preselected linear speed, a tension sensing means for sensing the tension in a segment of the web material between said unwind means and said apparatus for further processing the web material, said tension sensing means positioned adjacent said pressure roll and operably connected thereto for moving the pressure roll toward and away from said feed roll so that said web material is frictionally engaged between said feed roll and said pressure roll so that said web material is fed to said apparatus for further processing the web material at said second preselected linear speed thereby maintaining desired tension in a segment of the web material between said unwind means and said apparatus for further processing the web material.
Claim 3
Dependent Claim
56 words
Apparatus for controlling the tension on web material as set forth in claim 1 in which, said tension sensing means positioned in abutting relation with said web material between said unwind means and said apparatus for further processing the web material so that said web material continuously exerts an opposing force upon said tension sensing means.
Claim 4
Dependent Claim
110 words
Apparatus for controlling the tension on web material as set forth in claim 1 in which said tension sensing means includes, a tension sensing roll having a central bore therethrough and positioned in abutting relation with said web material between said unwind means and said apparatus for further processing the web material so that said web material continuously exerts a predetermined opposing force upon said tension sensing roll, said tension sensing roll is mechanically connected to said pressure roll for rotational movement about The longitudinal axis of said pressure roll so that upon rotation of said tension sensing roll said pressure roll moves toward and away from said feed roll.
Claim 5
Dependent Claim
62 words
Apparatus for controlling the tension on web material as set forth in claim 1 in which said tension sensing means includes, a tension sensing roll mechanically connected to said feed roll for rotational movement about the longitudinal axis of said feed roll so that upon rotation of said tension sensing roll said feed roll moves toward and away from said pressure roll.
Claim 6
Dependent Claim
180 words
Apparatus for controlling the tension on web material as set forth in claim 1 which includes, a pair of bushings nonrotatably mounted in a frame portion adjacent said unwind means and below said tension sensing roll, said bushings coaxially aligned on a common central axis passing therethrough, a first shaft member rotatably supported by said bushings, said first shaft member having an axis of rotation in said bushings eccentrically displaced from the common central axis of said bushings so that the axis of rotation of said first shaft member revolves about the common central axis of said bushings upon rotation of said first shaft member, a second shaft member positioned in the central bore of said tension sensing roll to permit rotation of said tension sensing roll relative to said second shaft member, a pair of tension arms nonrotatably secured at one end in spaced parallel relation to the ends of said second shaft member and extending substantially vertically downwardly therefrom for connection at said tension arms other end to the ends of said first shaft member for rotation therewith.
Claim 7
Dependent Claim
59 words
Apparatus for controlling the tension on web material as set forth in claim 5 wherein, said tension sensing roll positioned to continuously apply a predetermined pressure upon said web material and operable to rotate with said tension arms in clockwise and counterclockwise direction for maintaining a predetermined pressure upon said web material as the tension thereon increases and decreases.
Claim 8
Dependent Claim
96 words
Apparatus for controlling the tension on web material as set forth in claim 1 in which, said pressure roll is supported for relative rotation upon said first shaft member and positioned thereon between said pair of tension arms, said feed roll rotatably supported in said frame portion adjacent said pressure roll and positioned in abutting relation with the web material, means for rotating said first shaft member to thereby urge said pressure roll into abutting relation with the web material so that the web material is frictionally engaged between said pressure roll and said feed roll.
Claim 9
Dependent Claim
112 words
Apparatus for controlling the tension on web material as set forth in claim 1 in which, said tension sensing roll rotates with said tension arms in clockwise direction about said first shaft member in response to an increase in tension on a segment of the web material between the unwind means and the apparatus for further processing the web material to thereby urge said pressure roll toward said feed roll into abutting relation with the web material so that the web material is thereby frictionally engaged between the feed roll and the pressure roll and is fed to the apparatus for further processing the web material at said second preselected linear speed.
Claim 10
Dependent Claim
101 words
Apparatus for controlling the tension on web material as set forth in claim 1 in which, said tension sensing roll rotates with said tension arms in counterclockwise direction about said first shaft member in response to a decrease in tension on a segment of the web material between the unwind means and the apparatus for further processing the web material to thereby urge said pressure roll away from said feed roll out of abutting relation with the web material so that the web material is pulled through the apparatus for further processing the web material at said first preselected linear speed.
Claim 11
Dependent Claim
34 words
Apparatus for controlling the tension on web materIal as set forth in claim 1 in which, said second preselected linear speed is higher than said first preselected linear speed by a factor of 1.05.
Claim 12
Dependent Claim
97 words
Apparatus for controlling the tension on web material as set forth in claim 1 which includes, a wraparound roll rotatably supported in said frame portion adjacent said feed roll, said wraparound roll positioned in abutting relation with said web material, means drivingly connecting said wraparound roll to said feed roll to said pressure roll for transmitting rotation from said wraparound roll to said feed roll so that the web material passing between said feed roll and said pressure roll if fed upwardly therefrom into abutting relation with said tension sensing roll at said second preselected linear speed.
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) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |