JPS5649687A - Protecting device for electric sewing machine - Google Patents

Protecting device for electric sewing machine

Info

Publication number
JPS5649687A
JPS5649687A JP13438180A JP13438180A JPS5649687A JP S5649687 A JPS5649687 A JP S5649687A JP 13438180 A JP13438180 A JP 13438180A JP 13438180 A JP13438180 A JP 13438180A JP S5649687 A JPS5649687 A JP S5649687A
Authority
JP
Japan
Prior art keywords
coil
energized
transistor
voltage
case
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP13438180A
Other languages
Japanese (ja)
Inventor
Tadashi Takahashi
Shigeki Morinaga
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP13438180A priority Critical patent/JPS5649687A/en
Publication of JPS5649687A publication Critical patent/JPS5649687A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/093—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against increase beyond, or decrease below, a predetermined level of rotational speed

Landscapes

  • Sewing Machines And Sewing (AREA)
  • Stopping Of Electric Motors (AREA)

Abstract

PURPOSE:To prevent the burning of a motor or a clutch coil at the time of overload by comparing the speed command value and the speed of a machine shaft, and by disabling the driving mechanism in the case the output of the comparison is larger than the specified value for the specified period. CONSTITUTION:In the case the output of a tacho-generator TG is smaller than a command voltage SV, a clutch coil CL is energized through an operation amplifier OP and a transistor T3. In the case the machine speed in high, a braking coil BR is energized. When the machine is overloaded, a transistor T4 is turned on at the time the voltage of capacitor C1 becomes higher than the voltage of a constant voltage element ZD3, and the clutch coil CL is cut off. A monostable multivibrator MM is operated for a specified period, a transistor T1 is turned off, and a brake coil BR is energized. Therefore, the excitation of the clutch coil does not last long, and the motor and the like can be protected without fail.
JP13438180A 1980-09-29 1980-09-29 Protecting device for electric sewing machine Pending JPS5649687A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13438180A JPS5649687A (en) 1980-09-29 1980-09-29 Protecting device for electric sewing machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13438180A JPS5649687A (en) 1980-09-29 1980-09-29 Protecting device for electric sewing machine

Publications (1)

Publication Number Publication Date
JPS5649687A true JPS5649687A (en) 1981-05-06

Family

ID=15127056

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13438180A Pending JPS5649687A (en) 1980-09-29 1980-09-29 Protecting device for electric sewing machine

Country Status (1)

Country Link
JP (1) JPS5649687A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58124480A (en) * 1982-01-20 1983-07-25 三菱電機株式会社 Danger preventing apparatus of sewing machine
JP2010022630A (en) * 2008-07-22 2010-02-04 Juki Corp Controller for sewing machine
CH712287A1 (en) * 2016-03-22 2017-09-29 Bernina Int Ag Long-sleeve quilt and quilting machine arrangement.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4863214A (en) * 1971-12-09 1973-09-03

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4863214A (en) * 1971-12-09 1973-09-03

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58124480A (en) * 1982-01-20 1983-07-25 三菱電機株式会社 Danger preventing apparatus of sewing machine
JP2010022630A (en) * 2008-07-22 2010-02-04 Juki Corp Controller for sewing machine
CH712287A1 (en) * 2016-03-22 2017-09-29 Bernina Int Ag Long-sleeve quilt and quilting machine arrangement.
US10066328B2 (en) 2016-03-22 2018-09-04 Bernina International Ag Long arm quilt and lockstitch machine assembly

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