Patent US3907275A successfully refreshed from Google Patents.
US3907275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control apparatus
Assignee: Masson Scott Thrissell Engineering Ltd
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Filing: 1974-04-01
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Granted: 1975-09-23
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Expires: 1994-04-01
Abstract
Abstract At the delivery end of a sheeter, the cut sheets are taken from a conveyor and propelled by final rolls onto a stack. The final rolls must rotate at or above a minimum speed, while the conveyor can go below this. Normally the two speeds are related. The conveyor speed is monitored and for normal running the final rolls are governed by the monitor signal. For low conveyor speeds, this is cut out electronically and a constant governing signal applied instead to cause the final rolls to maintain a minimum speed.
Inventors
- 👤 Walter Howard Bossons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:03
CPC Classifications
B; B65; B65H; B65H43/00; B65H7/00; H; H02; H02P; H02P5/00; H02P5/46; H02P5/50
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
152 words
Sheet feeding mechanism for web cutting machines including a conveyor for cut sheets, delivery means at the downstream end of the conveyor for receiving the sheets and delivering them to a layboy or the like, drive means for the conveyor and for the delivery means, and means for controlling the speed of the delivery means in accordance with the speed of the conveyor comprising means for producing a signal related to the speed of said conveyor, means for applying said signal as a control output to the drive means for the delivery means, thereby to drive the latter at a speed related to that of the conveyor, means for biasing said signal to produce a modified control output representing a speed different from that of said conveyor, and over-ride means for rendering said applying means ineffective for signals indicating speeds below a limiting speed and to apply instead a constant control output.
Claim 2
Dependent Claim
152 words
Sheet feeding mechanism for web cutting machines including a conveyor for cut sheets, delivery means at the downstream end of the conveyor for receiving the sheets and delivering them to a layboy or the like, drive means for the conveyor and for the delivery means, and means for controlling the speed of the delivery means in accordance with the speed of the conveyor comprising means for producing a signal related to the speed of said conveyor, means for applying said signal as a control output to the drive means for the delivery means, thereby to drive the latter at a speed related to that of the conveyor, means for biasing said signal to produce a modified control output representing a speed different from that of said conveyor, and over-ride means for rendering said applying means ineffective for signals indicating speeds below a limiting speed and to apply instead a constant control output.
Claim 3
Dependent Claim
19 words
A mechanism as claimed in claim 1, wherein said over-ride means is adjustable to give different, selected limiting speeds.
Claim 4
Dependent Claim
13 words
A mechanism as claimed in claim 1, wherein said biasing means is adjustable.
Claim 5
Dependent Claim
30 words
A mechanism as claimed in claim 3, wherein said biasing means enables the delivery means to run at speeds greater, equal to or less than the speed of said conveyor.
Claim 6
Dependent Claim
19 words
A mechanism as claimed in claim 1, wherein there are separate motors for the conveyor and the delivery means.
Claim 7
Dependent Claim
42 words
A mechanism as claimed in claim 1, wherein the drive means is a single drive motor and a variable transmission device, the motor driving one of the conveyor means and the delivery means directly and the other through said variable transmission device.
Claim 8
Dependent Claim
16 words
A mechanism as claimed in claim 6, wherein the variable transmission device is a magnetic coupling.
Claim 9
Dependent Claim
16 words
A mechanism as claimed in claim 6, wherein the variable transmission device is a hydraulic coupling.
Claim 10
Dependent Claim
34 words
A mechanism as claimed in claim 1, wherein the drive means for the delivery means is a D.C. motor with a constantly energised field and an armature current controlled in accordance with said output.
References Cited (Backward Citations)
US3542362A
Cited
US3527460A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |