JPS56114151A - Drum device - Google Patents

Drum device

Info

Publication number
JPS56114151A
JPS56114151A JP1806980A JP1806980A JPS56114151A JP S56114151 A JPS56114151 A JP S56114151A JP 1806980 A JP1806980 A JP 1806980A JP 1806980 A JP1806980 A JP 1806980A JP S56114151 A JPS56114151 A JP S56114151A
Authority
JP
Japan
Prior art keywords
drum
magnetic tape
upper drum
reciprocatively
squeal
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
JP1806980A
Other languages
Japanese (ja)
Inventor
Noboru Kamijo
Kazuto Naganuma
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP1806980A priority Critical patent/JPS56114151A/en
Priority to DE19803027351 priority patent/DE3027351A1/en
Publication of JPS56114151A publication Critical patent/JPS56114151A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)

Abstract

PURPOSE:To prevent phenomena such as squeal and sticking of the magnetic tape, by finely oscillating one drum of the drum device of the VTR or the like reciprocatively in the rotation direction. CONSTITUTION:In the so-called propeller type drum device where magnetic head 4 interposed between upper drum 2 and lower drum 3 is rotated, upper drum 2 is mounted through a pair of upper and lower bearings 5a and 5b rotatably, and cam support 10 of a T-form section is oppositely allowed to contact with the side part of lower drum 3. Cam follower 23 mounted to the upper face of upper drum 2 is oppositely allowed to contact with off-center cam 14 to which rotation force of motor 18 is transferred, and upper drum 2 is rotated reciprocatively by power supply to motor 18. Since the frictional coefficient between the magnetic tape and upper drum 2 is lowered practically by this reciprocative rotation, phenomena such as squeal and sticking of the magnetic tape are prevented.
JP1806980A 1979-07-19 1980-02-15 Drum device Pending JPS56114151A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP1806980A JPS56114151A (en) 1980-02-15 1980-02-15 Drum device
DE19803027351 DE3027351A1 (en) 1979-07-19 1980-07-18 Permanent magnet operated linear actuator for valve - has operating plunger inside non magnetic sleeve and magnet movable on outside

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1806980A JPS56114151A (en) 1980-02-15 1980-02-15 Drum device

Publications (1)

Publication Number Publication Date
JPS56114151A true JPS56114151A (en) 1981-09-08

Family

ID=11961368

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1806980A Pending JPS56114151A (en) 1979-07-19 1980-02-15 Drum device

Country Status (1)

Country Link
JP (1) JPS56114151A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0599630A2 (en) * 1992-11-25 1994-06-01 Nippon Hoso Kyokai Head drum apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0599630A2 (en) * 1992-11-25 1994-06-01 Nippon Hoso Kyokai Head drum apparatus
EP0599630A3 (en) * 1992-11-25 1995-01-11 Japan Broadcasting Corp Head drum apparatus.
US5463506A (en) * 1992-11-25 1995-10-31 Nippon Hoso Kyokai Head drum apparatus

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