US3744804A - Retaining means for adjustably securing the head of a magnetic recording-reproducing means to a supporting cover plate - Google Patents

Retaining means for adjustably securing the head of a magnetic recording-reproducing means to a supporting cover plate Download PDF

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Publication number
US3744804A
US3744804A US00245309A US3744804DA US3744804A US 3744804 A US3744804 A US 3744804A US 00245309 A US00245309 A US 00245309A US 3744804D A US3744804D A US 3744804DA US 3744804 A US3744804 A US 3744804A
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US
United States
Prior art keywords
cover plate
head
nut
pinion
plate
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.)
Expired - Lifetime
Application number
US00245309A
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English (en)
Inventor
S Kudelski
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Individual
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Individual
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Publication date
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Publication of US3744804A publication Critical patent/US3744804A/en
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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed

Definitions

  • a high-performance magnetophone or recordingreproducing magnetic means
  • Fixing by bearing on the heads gives poor results since, first it generates stresses in the cover plate and second, the friction on the head produces a considerable control hysteresis.
  • Fixing by central pull is effected by means of a screw integral with the head and passing through the support disc and cover plate, this screw being secured by a nut under the cover plate and bearing upon it via a spring.
  • This latter method certainly provides a pressure without stress or control hysteresis but is extremely inconvenient for removing or slewing the heads since this demands access underneath the-cover plate. Such access requires a long, complicated, and delicate operation due to the fact that the mechanism of the apparatus, housed under the cover plate, is positioned directly beneath the heads.
  • the present invention relates to a device for securing the heads of a magnetophone whereby each head is secured directly on the cover plate by the pull of a rod, integral with the head.
  • the rod passes through the cover plate and engages a retaining device placed thereunder, bearing thereon via the intermediary of an elastic element.
  • the retaining device is coupled to a control member, one part of which passes through the cover plate so as to be accessible from outside the latter, while the retaining device, elastic element and control member are retained permanently in place underneath the said cover plate.
  • FIGURE comprised by this drawing is a schematical sectional view.
  • 1 is the cover plate of a magnetophone while 2 denotes one of the heads of the apparatus whose other parts are not described since they do not form part of the invention.
  • the head 2 comprises, in conventional fashion, a fixing screw 3 passing through a support disc 4 upon which the head 2 is seated, the said disc being rotatably mounted in a housing recessed for the purpose in the cover plate 1 and furnished with suitable means, not shown in the drawing, whereby it can be pivoted.
  • the screw 3 passes through the cover plate 1 and engages in a nut 6 having a peripheral gear rim.
  • a nut 6 having a peripheral gear rim.
  • dish-shaped springs 5 secured to the screw 3.
  • the gear rim 7 of the screw 6 meshes with a pinion 8 having an underturned intermediate cylinder 9 bearing on the cover plate 1 and a second cylinder 10 rotatably joumalled in the said plate and rising above the plate surface.
  • the cylinder 10 has a hex socket for taking a corresponding hex-head key 12.
  • the nut 6 and pinion 8 are retained in place beneath the cover plate by an appropriately shaped bridge plate 13 secured to the cover plate 1 by screws 14.
  • the said bridge plate 13 is provided with a hole 15 for passage of the screw 3.
  • the device here shown is used as follows:
  • the head 2 is normally secured to the cover plate 1 and in order to release it for turning or removal all that is necessary is to insert the key 12 into the hex socket of cylinder 10 and turn the latter anticlockwise.
  • cylinder 10 turns pinion 8 which, acting via the gear rim 7, in turn rotates nut 6 which can thereby be unscrewed to whatever extent desired, thereby easing or completely freeing screw 3 and hence the magnetic head 2 which is integral with it. If the head 2 is re moved, nut 6 and pinion 8 will be retained in place by the bridge plate 13 so that when the head 2 is replaced, the screw 3 can be engaged in the nut 6 without any difficulty.
  • the head is fixed on the support disc 4 because of a centreline axial pull, so that no stresses are imposed on the cover plate, and that the fixation thus provided permits exertion of a strong elastic pressure while at the same time being releasable at will so as ultimately to release the head for removal, and this without any need to strive for access through the mechanism arranged beneath the cover plate 1. Adjustment or removal of the head can thus be effected from above the cover plate without having to open up the apparatus. Rigidity is more important than easy access to the magnetic tape assured by reason of the head being fixed directly on the cover plate and not partly screened by a bridge. Fi-
  • gear-rimmed nut 6 can be replaced by a suitable coupling, such as a bayonet joint, in which case the screw 3 will be substituted by a rod provided with the necessary lugs.
  • the pinion 8 is replaced by, for example, a bell-crank lever integral with with the head, passing through the cover plate; a-
  • a device according to claim 1 wherein said shaft extends above the upper surface of the cover plate and is formed with a shaped axial hole for actuation by a tool.
  • a device according to claim 1 wherein said shaft is formed with a transverse slot for actuation by a screwdriver bit.
  • a device according to claim 1 wherein said threaded rod extends through a hole formed in the bridge plate.
  • a device according to claim 1 wherein said bridge plate is formed with a turned-up flange which retains the threaded nut and the pinion in their operating positions even though the threaded rod may be removed from the cover plate.

Landscapes

  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
US00245309A 1971-04-22 1972-04-19 Retaining means for adjustably securing the head of a magnetic recording-reproducing means to a supporting cover plate Expired - Lifetime US3744804A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH585571A CH537071A (fr) 1971-04-22 1971-04-22 Dispositif de fixation des têtes d'un magnétophone

Publications (1)

Publication Number Publication Date
US3744804A true US3744804A (en) 1973-07-10

Family

ID=4300430

Family Applications (1)

Application Number Title Priority Date Filing Date
US00245309A Expired - Lifetime US3744804A (en) 1971-04-22 1972-04-19 Retaining means for adjustably securing the head of a magnetic recording-reproducing means to a supporting cover plate

Country Status (10)

Country Link
US (1) US3744804A (fr)
JP (1) JPS52167910U (fr)
AT (1) AT312957B (fr)
CH (1) CH537071A (fr)
DE (1) DE2218304C3 (fr)
DK (1) DK132198C (fr)
FR (1) FR2134008B1 (fr)
GB (1) GB1386273A (fr)
IT (1) IT954649B (fr)
NL (1) NL158954B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4316226A (en) * 1978-12-26 1982-02-16 Nakamichi Corporation Head adjustment means for a tape recorder

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2199802A (en) * 1938-10-07 1940-05-07 Leitz Ernst Gmbh Adjusting device for adjacent parts of machinery
US2704426A (en) * 1954-11-15 1955-03-22 John G Macaulay Fastening device
GB794974A (en) * 1955-05-03 1958-05-14 Emi Ltd Improvements in or relating to mounting arrangements for magnetic transducing heads in magnetic recording or reproducing apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB839517A (en) * 1958-03-05 1960-06-29 Vickers Electrical Co Ltd Improvements relating to magnetic storage devices

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2199802A (en) * 1938-10-07 1940-05-07 Leitz Ernst Gmbh Adjusting device for adjacent parts of machinery
US2704426A (en) * 1954-11-15 1955-03-22 John G Macaulay Fastening device
GB794974A (en) * 1955-05-03 1958-05-14 Emi Ltd Improvements in or relating to mounting arrangements for magnetic transducing heads in magnetic recording or reproducing apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4316226A (en) * 1978-12-26 1982-02-16 Nakamichi Corporation Head adjustment means for a tape recorder

Also Published As

Publication number Publication date
FR2134008A1 (fr) 1972-12-01
FR2134008B1 (fr) 1976-06-11
CH537071A (fr) 1973-05-15
IT954649B (it) 1973-09-15
DE2218304C3 (de) 1975-11-06
DK132198B (da) 1975-11-03
NL7205004A (fr) 1972-10-24
AT312957B (de) 1974-01-25
JPS52167910U (fr) 1977-12-20
NL158954B (nl) 1978-12-15
DK132198C (da) 1976-04-26
DE2218304A1 (de) 1972-11-02
GB1386273A (en) 1975-03-05
DE2218304B2 (de) 1975-03-27

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