Patent US4739230A successfully refreshed from Google Patents.
US4739230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control device for controlling motor speed without hunting
Assignee: Canon Inc
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Filing: 1986-11-12
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Granted: 1988-04-19
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Expires: 2006-11-12
Abstract
Abstract A control device for use in maintaining a constant driving speed in various rotational objects such as a photosensitive drum, etc. for an electrophotographic reproduction apparatus, the control device being constructed with a driving device; a detecting device to sense a driving condition of the driving device; first and second control devices to drive control the driving device; and a change-over device to change the drive-control of the driving device from the first control device over to the second control device in accordance with an output from the detecting device, thereby quickly bringing the driving condition of the rotating object back to its original controlled condition, even under abrupt variations in the load imposed thereon.
Inventors
- 👤 Hiraku Sonobe
- 👤 Ken Miyagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:28
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/18; H02P23/186; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/904; Y10S388/907; Y10S388/91; Y10S388/915; Y10S388/916; Y10S388/921
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
177 words
A motor control device comprising: a motor; speed detection means for detecting the rotating speed of said motor; variation detecting means for detecting whether or not variation in the speed of said motor is out of predetermined range on driving said motor in a steady state; first drive means responsive to the detection output from said speed detection means for drivng said motor to regulate the speed of said motor when said variation detecting means detects that the variation in the speed of said motor is within the predetermined range; and second drive means having means for generating a predetermined pattern signal; wherein said variation detecting means detects whether or not variation in the speed of motor is out of the predetermined range utilizing an output from said first drive means; and said second drive means provides a predetermined output to said motor in accordance with said predetermined pattern signal during resumption of a steady state in the speed of said motor when said variation detecting means detects that the variation is out of the predetermined range.
Claim 2
Dependent Claim
177 words
A motor control device comprising: a motor; speed detection means for detecting the rotating speed of said motor; variation detecting means for detecting whether or not variation in the speed of said motor is out of predetermined range on driving said motor in a steady state; first drive means responsive to the detection output from said speed detection means for drivng said motor to regulate the speed of said motor when said variation detecting means detects that the variation in the speed of said motor is within the predetermined range; and second drive means having means for generating a predetermined pattern signal; wherein said variation detecting means detects whether or not variation in the speed of motor is out of the predetermined range utilizing an output from said first drive means; and said second drive means provides a predetermined output to said motor in accordance with said predetermined pattern signal during resumption of a steady state in the speed of said motor when said variation detecting means detects that the variation is out of the predetermined range.
Claim 3
Dependent Claim
55 words
A motor control device according to claim 1, further comprising reference signal forming means for forming a reference signal, wherein said first drive means compares a phase of the reference signal from said reference signal forming means and a phase of the detection output from said detection means, thereby effecting the drive-control of said motor.
Claim 4
Dependent Claim
74 words
A motor control device according to claim 2, wherein said detection means includes pulse signal generating means to generate pulse signals following the driving of said motor, and said first drive means detects a difference in phase between the reference pulse signal generated from said reference signal forming means and the pulse signal generated from said pulse signal generating means so as to drive said motor in accordance with the phase difference as detected.
Claim 5
Dependent Claim
53 words
A motor control device according to claim 3, wherein said variation detection means includes change-rate detection means for detecting a rate of change of the output from said first drive means within a predetermined time, and changes over said first drive means to said second drive means in accordance with a detected change-rate.
Claim 6
Dependent Claim
51 words
A motor control device according to claim 1 wherein said pattern signal generating means is arranged to form a plurality of kinds of pattern signals and said second drive means selects one of said plurality of kinds of pattern signals in accordance with a detection output from said variation detecting means.
Claim 7
Dependent Claim
27 words
A motor control device according to claim 5, wherein said second drive means includes a timer for producing said pattern signal output for a predetermined time period.
Claim 8
Dependent Claim
23 words
A motor control device according to claim 1, wherein said motor is a DC motor for driving a photosensitive drum for image formation.
Claim 9
Dependent Claim
194 words
A motor control device comprising: a motor; speed detection means for detecting the rotating speed of said motor; variation detecting means for detecting whether or not variation in the speed of said motor is out of a predetermined range on driving said motor in a steady state; and drive means, having first and second modes, for driving said motor to regulate the speed of said motor, said drive means including pattern signal generating means for generating a predetermined pattern signal, wherein said variation detecting means detects whether or not variation in the speed of said motor is out of the predetermined range utilizing an output from said drive means, and wherein said first mode is provided for driving said motor in accordance with the detection output from said speed detection means when said variation detecting means detects that the variation in the speed of said motor is within the predetermined range, and said second mode is provided for driving said motor by using a predetermined output in accordance with said predetermined pattern signal, when said variation detecting means detects that the variation in the speed of said motor is out of the predetermined range.
Claim 10
Dependent Claim
194 words
A motor control device comprising: a motor; speed detection means for detecting the rotating speed of said motor; variation detecting means for detecting whether or not variation in the speed of said motor is out of a predetermined range on driving said motor in a steady state; and drive means, having first and second modes, for driving said motor to regulate the speed of said motor, said drive means including pattern signal generating means for generating a predetermined pattern signal, wherein said variation detecting means detects whether or not variation in the speed of said motor is out of the predetermined range utilizing an output from said drive means, and wherein said first mode is provided for driving said motor in accordance with the detection output from said speed detection means when said variation detecting means detects that the variation in the speed of said motor is within the predetermined range, and said second mode is provided for driving said motor by using a predetermined output in accordance with said predetermined pattern signal, when said variation detecting means detects that the variation in the speed of said motor is out of the predetermined range.
Claim 11
Dependent Claim
41 words
A motor control device according to claim 8, wherein said pattern signal generating means is arranged to form a plurality of types of pattern signals and select one of said plurality of the pattern signals so as to drive said motor.
Claim 12
Dependent Claim
60 words
A motor control device according to claim 9, further comprising reference signal forming means for forming a reference signal, wherein in said first control mode said drive means compares a phase of the reference signal from said reference signal forming means and a phase of the detection output from said detection means, thereby effecting the drive control of said motor.
Claim 13
Dependent Claim
31 words
A motor pattern device according to claim 10, wherein in said second control mode said drive means includes a timer for producing said selected control signal for a predetermined time period.
Claim 14
Dependent Claim
23 words
A motor control device according to claim 8, wherein said motor is a DC motor for driving a photosensitive drum for image formation.
References Cited (Backward Citations)
US3176208A
Cited
US3309597A
Cited
US3706020A
Cited
US3943421A
Cited
US3942084A
Cited
US3836833A
Cited
US3906319A
Cited
US3953776A
Cited
US3917989A
Cited
US4088932A
Cited
US4193020A
Cited
US4311949A
Cited
US4250435A
Cited
US4406981A
Cited
US4605884A
Cited
US4514672A
Cited
US4473783A
Cited
US4572995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |