US3633718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission and brake for stopping conveyors
Assignee: Boewe Boehler and Weber KG
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Filing: 1969-11-04
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Granted: 1972-01-11
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Expires: 1989-11-04
Abstract
Abstract A drive shaft of an intermittently movable conveyor is alternately entrainable, via respective slipping clutches, by a high-speed and a low-speed input shaft, the switchover to low speed occuring shortly before the arresting of the drive shaft at the end of an operating cycle. A pulse counter excited by the drive shaft measures a braking interval in the final phase of each operating cycle and, at the inception of that interval, triggers a generator of progressively increasing voltage whose output causes the switchover upon reaching a reference value registered in a storage circuit. Depending upon the length of time required for the drive shaft speed to reach its lower limit, the stored reference voltage is either increased or reduced to delay or advance the switchover point to a predetermined instant slightly preceding the end of the cycle.
Inventors
- 👤 Rudolf Wanner
- 👤 Berthold Mader
- 👤 Theodor Mayr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:15
CPC Classifications
B; B23; B23D; B23D33/00; B23D33/006
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
377 words
A system for intermittently driving a load in repetitive operating cycles, comprising: a driven member connected with the load to be driven; continuously operable drive means switchable between a high and a low speed level, said drive means being operatively connected with said driven member and including a yieldable coupling effective at least at said low speed level whereby said driven member is progressively decelerated upon a switching to said low speed level and is arrestable on being entrained at low speed; switchover means for said drive means having a high-speed and a low-speed position; path-length-measuring means responsive to the displacement of said driven member for emitting a first signal upon the attainment of a predetermined intermediate point of a working stroke and for emitting a second signal upon the approach of a terminal point of said working stroke; generator means effective in the high-speed position of said switchover means and controlled by said path-length-measuring means for starting the generation of a progressively changing variable upon the occurrence of said first signal; a source of a reference magnitude for said variable; comparator means connected to said generator means and to said source for determining the arrival of said variable at a value bearing a predetermined relationship with said reference magnitude, said comparator means on ascertaining said relationship providing an output signal controlling said switchover means for changing same to said low-speed position whereby said driven member is subjected to progressive deceleration; speed-sensing means controlled by said driven member for determining the arrival thereof at a critical speed close to said low speed level; timing means jointly controlled by said speed-sensing means and said path-length-measuring means for determining the relative time position of the instant of arrival at said critical speed and the emission of said second signal, said source being responsive to said timing means for altering said reference magnitude in a sense shifting the point of change of said switchover means during a subsequent operating cycle to terminate the deceleration of said driven member at an instant closer to the emission of said second signal; and stop means controlled by said path-length-measuring means for momentarily arresting said drIven member upon its arrival at said terminal point and for restoring said switchover means to said high-speed position.
Claim 2
Independent Claim
377 words
A system for intermittently driving a load in repetitive operating cycles, comprising: a driven member connected with the load to be driven; continuously operable drive means switchable between a high and a low speed level, said drive means being operatively connected with said driven member and including a yieldable coupling effective at least at said low speed level whereby said driven member is progressively decelerated upon a switching to said low speed level and is arrestable on being entrained at low speed; switchover means for said drive means having a high-speed and a low-speed position; path-length-measuring means responsive to the displacement of said driven member for emitting a first signal upon the attainment of a predetermined intermediate point of a working stroke and for emitting a second signal upon the approach of a terminal point of said working stroke; generator means effective in the high-speed position of said switchover means and controlled by said path-length-measuring means for starting the generation of a progressively changing variable upon the occurrence of said first signal; a source of a reference magnitude for said variable; comparator means connected to said generator means and to said source for determining the arrival of said variable at a value bearing a predetermined relationship with said reference magnitude, said comparator means on ascertaining said relationship providing an output signal controlling said switchover means for changing same to said low-speed position whereby said driven member is subjected to progressive deceleration; speed-sensing means controlled by said driven member for determining the arrival thereof at a critical speed close to said low speed level; timing means jointly controlled by said speed-sensing means and said path-length-measuring means for determining the relative time position of the instant of arrival at said critical speed and the emission of said second signal, said source being responsive to said timing means for altering said reference magnitude in a sense shifting the point of change of said switchover means during a subsequent operating cycle to terminate the deceleration of said driven member at an instant closer to the emission of said second signal; and stop means controlled by said path-length-measuring means for momentarily arresting said drIven member upon its arrival at said terminal point and for restoring said switchover means to said high-speed position.
Claim 3
Dependent Claim
26 words
A system as defined in claim 1 wherein said path-length-measuring means comprises a pulse generator and a pulse counter receiving the output of said pulse generator.
Claim 4
Dependent Claim
32 words
A system as defined in claim 2 wherein said driven member is a shaft, said pulse generator including a toothed wheel on said shaft and electromagnetic pick up means adjacent said wheel.
Claim 5
Dependent Claim
39 words
A system as defined in claim 2 wherein said speed-sensing means comprises a sawtooth-voltage generator triggerable by the output of said pulse generator and threshold means for comparing the output of said sawtooth-voltage generator with a predetermined amplitude level.
Claim 6
Dependent Claim
32 words
A system as defined in claim 1 wherein said generator means comprises a voltage generator with a substantially linearly varying output voltage, said source being a storage circuit for an electrical charge.
Claim 7
Dependent Claim
120 words
A system as defined in claim 5 wherein said timing means comprises a bistable element settable by said speed-sensing means and resettable by said comparator means, a first coincidence circuit jointly controlled by said bistable element and said path-length-measuring means for causing a progressive increase in the charge of said storage circuit during a period beginning with said output signal and ending with said second signal, upon said output signal preceding said second signal, and a second coincidence circuit jointly controlled by said bistable element and by said path-length-measuring means for causing a progressive decrease in said charge during a period beginning with said second signal and ending with said output signal, upon said second signal preceding said output signal.
Claim 8
Dependent Claim
39 words
A system as defined in claim 6 wherein said first and second coincidence circuits comprise a pair of AND-gates with respective inputs connected in parallel to an output of said bistable element, one of said inputs including an inverter.
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |