Registers – Transfer mechanism – Traveling pawl
Patent
1975-09-05
1977-01-04
Wise, Edward J.
Registers
Transfer mechanism
Traveling pawl
235 92DN, G01P 350, H03K 2100
Patent
active
040015629
ABSTRACT:
A speed sensing device comprises two electronic counters fed with electric pulses from first and second sensors; the first sensor emits sensing pulses at a rate proportional to the speed of a member past said sensor, and the second sensor emits reference pulses at a rate proportional to that of a reference member past the second sensor. Each of the counters is adapted to emit an output signal whenever a respective preselected number of pulses has been received since the counter was last reset, and both said counters are arranged to be reset whenever either counter emits an output signal.
Such a device may be used in association with a web-consuming machine receiving web from a bobbin. The first and second sensors are then arranged respectively to sense the rotational speeds of the bobbin and of a reference member in the machine drive e.g. a drive shaft. As web is removed from the bobbin, its rotational speed increases (relative to the machine speed) due to the decreasing diameter of the bobbin. The preselected numbers at which the counters emit outputs may be so chosen that the second counter repeatedly emits an output signal to reset both counters until the quantity of web remaining on the bobbin is reduced to a chosen level, at which time the first counter emits an output signal to indicate that said chosen level of web remaining has been reached.
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patent: 3172208 (1965-03-01), Lowy
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patent: 3663806 (1972-05-01), Drankhan et al.
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patent: 3721809 (1973-03-01), Strandberg, Jr. et al.
patent: 3781532 (1973-12-01), Dorsman et al.
patent: 3834648 (1974-09-01), Rose, Jr. et al.
patent: 3898436 (1975-08-01), Pottebaum et al.
Molins Limited
Wise Edward J.
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