JPS5733362A - Detector for revolution defect - Google Patents

Detector for revolution defect

Info

Publication number
JPS5733362A
JPS5733362A JP10736880A JP10736880A JPS5733362A JP S5733362 A JPS5733362 A JP S5733362A JP 10736880 A JP10736880 A JP 10736880A JP 10736880 A JP10736880 A JP 10736880A JP S5733362 A JPS5733362 A JP S5733362A
Authority
JP
Japan
Prior art keywords
rotating speed
signal
cam shaft
main motor
revolution
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
JP10736880A
Other languages
Japanese (ja)
Inventor
Toshio Yajima
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.)
Komatsu Ltd
Original Assignee
Komatsu 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 Komatsu Ltd filed Critical Komatsu Ltd
Priority to JP10736880A priority Critical patent/JPS5733362A/en
Publication of JPS5733362A publication Critical patent/JPS5733362A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/56—Devices characterised by the use of electric or magnetic means for comparing two speeds
    • G01P3/58—Devices characterised by the use of electric or magnetic means for comparing two speeds by measuring or comparing amplitudes of generated currents or voltage

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Presses (AREA)

Abstract

PURPOSE:To accurately detect the revolution defect of a cam shaft despite the change in the rotating speed of a main motor by respectively detecting the rotating speed of the main motor and cam shaft of a press machine, and comparing the ratio between both with a preset threshold value. CONSTITUTION:A tachometer generator 1 detects the rotating speed of the main motor of a press machine and outputs a detection signal Vm. A tachometer generator 2 detects the rotating speed of its cam shaft and outputs a detection signal Vc. Thence, an analog divider 5 operates Vc/Vm and emits a signal Vk. The value of the signal Vk remains constant in spite of a change in the rotating speed of the main motor and when anormality occurs in the cam shaft and the signal Vc changes, said signal changes accordingly. Hence, by comparing the signal Vk and the threshold value Vk by a comparator 6, the revolution defect of the cam shaft is accurately detected without degrading the accuracy of detection despite the change in the rotating speed of the main motor.
JP10736880A 1980-08-05 1980-08-05 Detector for revolution defect Pending JPS5733362A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10736880A JPS5733362A (en) 1980-08-05 1980-08-05 Detector for revolution defect

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10736880A JPS5733362A (en) 1980-08-05 1980-08-05 Detector for revolution defect

Publications (1)

Publication Number Publication Date
JPS5733362A true JPS5733362A (en) 1982-02-23

Family

ID=14457313

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10736880A Pending JPS5733362A (en) 1980-08-05 1980-08-05 Detector for revolution defect

Country Status (1)

Country Link
JP (1) JPS5733362A (en)

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