US3931498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutoff saw
Assignee: Black Clawson Co
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Filing: 1972-04-19
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Granted: 1976-01-06
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Expires: 1992-04-19
Abstract
Abstract Logs which are to be divided into standard length blocks are first measured and their total length is displayed visually on an electronic readout device. Based on this length measurement, an operator selects one of several standard lengths and causes the log to advance relative to a cutoff saw where it is then cut. Total length measurement is determined by presetting a counter with a count representing maximum possible log length, down counting the counter when the trailing edge is detected and stopping the count when the leading edge reaches a reference position. Movement of the log is obtained from a tachometer generator mounted to rotate with a conveyor drive and an electronic circuit converts the output of the tachometer generator into pulses each representing a predetermined and convenient unit of length measurement.
Inventors
- 👤 John F. Bowker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:26
CPC Classifications
B; B27; B27B; B27B1/00; B27B1/002; G; G06; G06M; G06M3/00; G06M3/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
189 words
Apparatus for converting pulses representing movement in one unit of measurement to pulses representing another unit of measurement, including means for generating pulses representing both distance and direction of movement, clock means for supplying clock pulses at a rate higher than the pulse rate of said pulse generating means, first and second adjustable counter means, means responsive to said first counter for supplying a predetermined number of clock pulses to said second counter for each pulse supplied by said pulse generating means, and gate means responsive to the pulse output of said pulse generating means for directing said predetermined number of pulses to cause said second counter to count either up or down, depending on the direction of movement of said pulse generating means, said second counter providing one of two outputs, depending upon the direction of movement of said pulse generating means, whenever the number of pulses supplied thereto obtains a predetermined value, whereby the output from said second counter means is determined by the pulses supplied from said pulse generating means as modified between ratio of the predetermined number preset into the first and second counter means.
Claim 2
Dependent Claim
189 words
Apparatus for converting pulses representing movement in one unit of measurement to pulses representing another unit of measurement, including means for generating pulses representing both distance and direction of movement, clock means for supplying clock pulses at a rate higher than the pulse rate of said pulse generating means, first and second adjustable counter means, means responsive to said first counter for supplying a predetermined number of clock pulses to said second counter for each pulse supplied by said pulse generating means, and gate means responsive to the pulse output of said pulse generating means for directing said predetermined number of pulses to cause said second counter to count either up or down, depending on the direction of movement of said pulse generating means, said second counter providing one of two outputs, depending upon the direction of movement of said pulse generating means, whenever the number of pulses supplied thereto obtains a predetermined value, whereby the output from said second counter means is determined by the pulses supplied from said pulse generating means as modified between ratio of the predetermined number preset into the first and second counter means.
Claim 3
Dependent Claim
74 words
The apparatus of claim 1 wherein said second counter means includes an up-down counter, said counter generating an output each time it down counts to zero, coincidence gates connected to the output of said up-down counter for generating an output each time said counter up counts to a predetermined number, and means for setting a preset number into said counter each time an output is generated by either said counter or said coincidence gates.
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) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |