JPS5717004A - Safety device of industrial sewing machine - Google Patents

Safety device of industrial sewing machine

Info

Publication number
JPS5717004A
JPS5717004A JP9063080A JP9063080A JPS5717004A JP S5717004 A JPS5717004 A JP S5717004A JP 9063080 A JP9063080 A JP 9063080A JP 9063080 A JP9063080 A JP 9063080A JP S5717004 A JPS5717004 A JP S5717004A
Authority
JP
Japan
Prior art keywords
current
sewing machine
trm
transistors
industrial sewing
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
JP9063080A
Other languages
Japanese (ja)
Inventor
Kazuaki Takada
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 JP9063080A priority Critical patent/JPS5717004A/en
Publication of JPS5717004A publication Critical patent/JPS5717004A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
    • H03K17/0826—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in bipolar transistor switches

Landscapes

  • Sewing Machines And Sewing (AREA)
  • Safety Devices In Control Systems (AREA)

Abstract

PURPOSE:To ensure the protection of transistors and thus to increase the reliability of a control device, by detecting the current flowing to the transistor of a control circuit and then turning off immediately when the detected current exceeds a prescribed level. CONSTITUTION:An AC input 1 is charged to a capacitor CO after a full wave rectification carried out by diodes D1-D4, and all transistors TR1-TR6 are turned off when the power source is applied to a circuit. Thus no current is flowed to each of clutch coil CL- thread cutting solenoid TRM of an industrial sewing machine. When these CL-TRM are actuated when necessary, the TR1-TR6 are selected for conduction by the output of a signal control circuit CTR. In case when a fault arises at either one of the circuits, a current detection element CD detects this fault. This faulty current is compared with the reference voltage Vref by a comparator CM. Then logical circuits AD1-AD6 are controlled by the output of an FF11 to protect TR1-TR6.
JP9063080A 1980-07-04 1980-07-04 Safety device of industrial sewing machine Pending JPS5717004A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9063080A JPS5717004A (en) 1980-07-04 1980-07-04 Safety device of industrial sewing machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9063080A JPS5717004A (en) 1980-07-04 1980-07-04 Safety device of industrial sewing machine

Publications (1)

Publication Number Publication Date
JPS5717004A true JPS5717004A (en) 1982-01-28

Family

ID=14003799

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9063080A Pending JPS5717004A (en) 1980-07-04 1980-07-04 Safety device of industrial sewing machine

Country Status (1)

Country Link
JP (1) JPS5717004A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63186690A (en) * 1987-01-30 1988-08-02 三菱電機株式会社 Protective apparatus of multi-load drive control apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63186690A (en) * 1987-01-30 1988-08-02 三菱電機株式会社 Protective apparatus of multi-load drive control apparatus

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