JPS5649687A - Protecting device for electric sewing machine - Google Patents
Protecting device for electric sewing machineInfo
- 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
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.
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4863214A (en) * | 1971-12-09 | 1973-09-03 |
-
1980
- 1980-09-29 JP JP13438180A patent/JPS5649687A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4863214A (en) * | 1971-12-09 | 1973-09-03 |
Cited By (5)
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 |
JPS6248515B2 (en) * | 1982-01-20 | 1987-10-14 | Mitsubishi Electric Corp | |
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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