Electricity: motive power systems – Positional servo systems – Digital or numerical systems
Patent
1986-06-23
1987-12-01
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Digital or numerical systems
318318, G05B 1929
Patent
active
047106883
ABSTRACT:
In a sewing machine, a variable speed setting device generates a variable reference speed signal which is applied to a controller. A tachogenerator produces speed pulses at a frequency proportional to the speed of a motor which drives a needle armshaft. The speed pulses are counted during the interval between successive ones of low-frequency clock pulses and a first actual speed signal proportional to the speed of rotation of the motor is derived from the count. High-frequency clock pulses are counted during the interval between successive ones of the speed pulses and a second actual speed signal proportional to the speed of rotation of the motor is derived from the count. The first actual speed signal is enabled when the reference speed signal is higher than a predetermined value and the second actual speed signal enabled when the reference speed signal is lower than the predetermined value. The controller responds to the enabled signal by controlling the speed of the motor so that the enabled signal substantially equals the reference speed signal.
REFERENCES:
patent: 3953776 (1976-04-01), Wolf
patent: 4216418 (1980-08-01), Wagensonner et al.
patent: 4386301 (1983-05-01), Neki et al.
patent: 4556001 (1985-12-01), Neki et al.
Dohi Takashi
Neki Shigeo
Ohara Kenichi
Shibata Nobuho
Martin D.
Matsushita Electric - Industrial Co., Ltd.
Shoop Jr. William M.
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