JPS6425331A - Reel radius detecting circuit for magnetic tape device - Google Patents

Reel radius detecting circuit for magnetic tape device

Info

Publication number
JPS6425331A
JPS6425331A JP62179973A JP17997387A JPS6425331A JP S6425331 A JPS6425331 A JP S6425331A JP 62179973 A JP62179973 A JP 62179973A JP 17997387 A JP17997387 A JP 17997387A JP S6425331 A JPS6425331 A JP S6425331A
Authority
JP
Japan
Prior art keywords
reel
radius
winding
winding reel
motor
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
JP62179973A
Other languages
Japanese (ja)
Inventor
Kenji Toki
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 JP62179973A priority Critical patent/JPS6425331A/en
Publication of JPS6425331A publication Critical patent/JPS6425331A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To correctly detect the radius of both reels and to attain a high speed re-winding even after a power source is inputted again by detecting the radius ratio of a supply reel and a winding reel and the number of the rotations of the winding reel and calculating the radius of the winding reel and the supply reel. CONSTITUTION:The tachopulse of a supply reel motor 1, a winding reel motor 2 and tachometers 3 and 4 is inputted to a radius ratio detector 5, and the radius ratio of a supply reel 101 and a winding reel 102 is detected. The tachometer 4 of the winding reel motor 2 is sent to a rotation number detector 6 and the number of the rotations of the winding reel 102 is detected. The output of the radius ratio detector 5 and the rotation number detector 6 is sent to a radius computing element 7 and the radius of the supply reel 101 and the winding reel 102 is operated. After inertia computing elements 8 and 9 are passed, it is added with the output of a speed controller 14 and a tension controller 15 by current computing elements 10 and 11, and by motor driving circuits 12 and 13, the supply reel motor 1 and the winding reel motor 2 are driven and controlled. Thus, even after the power source is inputted again, the reel radius can be correctly detected, and the high speed re-winding can be executed.
JP62179973A 1987-07-21 1987-07-21 Reel radius detecting circuit for magnetic tape device Pending JPS6425331A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62179973A JPS6425331A (en) 1987-07-21 1987-07-21 Reel radius detecting circuit for magnetic tape device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62179973A JPS6425331A (en) 1987-07-21 1987-07-21 Reel radius detecting circuit for magnetic tape device

Publications (1)

Publication Number Publication Date
JPS6425331A true JPS6425331A (en) 1989-01-27

Family

ID=16075218

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62179973A Pending JPS6425331A (en) 1987-07-21 1987-07-21 Reel radius detecting circuit for magnetic tape device

Country Status (1)

Country Link
JP (1) JPS6425331A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6622113B2 (en) 2001-06-21 2003-09-16 International Business Machines Corporation Method and apparatus for detecting and computing tape reel radius using low-resolution angular position sensors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6622113B2 (en) 2001-06-21 2003-09-16 International Business Machines Corporation Method and apparatus for detecting and computing tape reel radius using low-resolution angular position sensors

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