US3668343A - Sound playback device with improved coil spring pick-up arm - Google Patents

Sound playback device with improved coil spring pick-up arm Download PDF

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Publication number
US3668343A
US3668343A US7181A US3668343DA US3668343A US 3668343 A US3668343 A US 3668343A US 7181 A US7181 A US 7181A US 3668343D A US3668343D A US 3668343DA US 3668343 A US3668343 A US 3668343A
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US
United States
Prior art keywords
contact
arm
pick
sound playback
playback device
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Expired - Lifetime
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US7181A
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English (en)
Inventor
Corrado Raffaeli
Guiliana Somigli
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Individual
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Individual
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
    • G11B33/06—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon combined with other apparatus having a different main function
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S200/00—Electricity: circuit makers and breakers
    • Y10S200/34—Recording and reproducing

Definitions

  • ABSTRACT A phonograph has a pivoted pick-up arm and a switch comprising a first contact member protruding from said arm and arcuately movable over at least one second contact member. Operation of said switch actuates circuits for the function of auxiliary devices during playback.
  • This invention provides a sound playback device comprising a pivoted pick-up arm and a switch, said switch comprising a first contact member on said arm and arcuately movable over at least one fixed second contact member.
  • the invention is particularly advantageous where it is desired to operate another electrically operated device for all or part of the time during sound playback.
  • the switch according to the present invention may serve, for example, to periodically control the movement of the movable eyes and tongue, as disclosed in Applicants copending US. Pat. application, No. 823,769.
  • the spacing relationship of the contacting parts of the fixed contact member(s), can be varied to provide particular effects.
  • timing pf the playing of the sound playback machine and the operation of auxiliary devices connected thereto is provided in a simple manner.
  • FIG. I is a schematic plan view of a mechanical amplifying sound playback machine having a pointer switch and printed circuit contacting member according to the present invention
  • FIG. 2 is a schematic front view of FIG. 1
  • F IG. 3 is a schematic side view of FIG. 1 and FIG. 4 is an enlarged partly sectional view of the contact pointer of FIG. 1.
  • the sound playback machine comprises amovable arm 1 pivoted at 4 and provided at the upper part of its free end with a cone 6 (FIG. 2). Vibrations picked up by a stylus 11 on an extension 10 of arm 1 are transferred to an arm pivoted at 3 and carrying a hom-type loud-speaker 9.
  • the apex of cone 6 contacts arm 5 (FIGS. 2 and 3) and during sound playback of a conventional grooved record disc 2 described a circular path 14 in the direction of the arrow in FIG. 1.
  • the vibrations picked up by stylus 11 are mechanically amplified since for the third class lever comprising fulcrum 3,
  • a pointer contact 7 is connected to the free end of playback arm 1, a lead 12 being welded to contact 7, through a hole within arm 1 and connected to a pole of battery P; the other battery pole is connected to a driven device C the other end of which is connected to a contacting member 8 in a printed circuit.
  • Contacting member 8 has a plurality of copper strips a of a certain width and spaced apart by spacings b. In the circuit of FIG. 1, whenever pointer 7 passes on a metal strip a, the circuit is closed and a current pulse passes to the driven device C During the intervals of time when said pointer 7 is over a non-conducting space b, the circuit is open.
  • the driven device C is connected in parallel with a driving device C said device C being connected to a contact 0 separated from the other contact strips 0 of member 8 so that the movement of metal pointer 7 along contacting member 8 successively operates the two devices.
  • the driven device C comprises, for example, a small electromagnet which is operated when pointer 7 contacts the last contact c of member 8. Electromagnet C may be used, for example, to restart the sound playback of record 2.
  • the pointer 7 should have particular features in order not to disturb the operation of the sound playback machine.
  • the pressure exerted by pointer 7 on contacting member 8 should be just sufficient to ensure a good electrical contact but not to create an excessive mechanical load on the driving motor for record 2 which would tend to change the revolution speed of the latter with resulting distortion in sound playback.
  • metal pointer 7 comprises a wire coil 13 (FIG. 4); the coil is internally hollow, so that pointer 7 has a tubular cross-section.
  • Such a pointer is extremely flexible, but resilient and gives a good electrical contact with minimum load for the motor of the sound playback machine.
  • a pick-up arm having one end pivotally mounted on said device and having its other end disposed adjacent a rotatable record, a vibration pick-up head connected to said other end of said arm for contacting the record, sound reproducing means mounted in contact with said other end of said arm for producing sound in response to vibration of said pick-up head, a switch including a first contact fixed to said pick-up arm and a fixed second contact disposed for engagement by said first contact, a series connected load and potential source connected to said first and second contacts, whereby arcuate movement of said first contact upon pivotal movement of said pick-up arm during the playing of the record closes a circuit for said source and load when said first contact engages said second contact.
  • said first contact comprises a closely wound conductive wire coil connected at one end to said pick-up arm and having a free end for making resilient contact with said second contact member.
  • a plurality of additional fixed contacts arranged in an arcuate path with said second contact and electrically connected thereto for successive engagement by said arcuately movable first contact.

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  • Toys (AREA)
  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)
  • Switches With Compound Operations (AREA)
US7181A 1969-05-03 1970-01-30 Sound playback device with improved coil spring pick-up arm Expired - Lifetime US3668343A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT3688869 1969-05-03

Publications (1)

Publication Number Publication Date
US3668343A true US3668343A (en) 1972-06-06

Family

ID=11245834

Family Applications (1)

Application Number Title Priority Date Filing Date
US7181A Expired - Lifetime US3668343A (en) 1969-05-03 1970-01-30 Sound playback device with improved coil spring pick-up arm

Country Status (5)

Country Link
US (1) US3668343A (enrdf_load_stackoverflow)
DE (1) DE1959099B2 (enrdf_load_stackoverflow)
ES (1) ES374538A1 (enrdf_load_stackoverflow)
FR (1) FR2046071A5 (enrdf_load_stackoverflow)
GB (1) GB1296101A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4622658A (en) * 1983-01-27 1986-11-11 Ozen Corporation Simplified sound reproducing device having switchable circuits

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2104692C3 (de) * 1971-02-02 1981-10-29 Braun Ag, 6000 Frankfurt Schaltungsanordnung zum automatischen Steuern der Bewgungen eines Tonarms
GB1519642A (en) * 1974-07-06 1978-08-02 Aiwa Co Information and recording apparatus

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1975928A (en) * 1929-09-28 1934-10-09 Rca Corp Method and means for making sound records
US2347735A (en) * 1942-09-19 1944-05-02 Bell Telephone Labor Inc Switching mechanism
US2494622A (en) * 1948-02-06 1950-01-17 Weston Electrical Instr Corp Contact arm for self-resetting magnetic contact relays
US2564416A (en) * 1949-03-14 1951-08-14 William A Wildhack Mechanoelectric transducer
US2874237A (en) * 1957-12-03 1959-02-17 Jr Bernard Edward Shlesinger Multiple contact switch
US3081383A (en) * 1959-10-30 1963-03-12 Panayotis C Dimitracopoulos Method and means for variable resistance recording
US3089923A (en) * 1959-06-15 1963-05-14 Endevco Corp Sectional digital switch
US3226495A (en) * 1962-10-04 1965-12-28 Fujitsu Ltd Rotary switch structure with saddleshaped insulator and two-legged contact brush

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1975928A (en) * 1929-09-28 1934-10-09 Rca Corp Method and means for making sound records
US2347735A (en) * 1942-09-19 1944-05-02 Bell Telephone Labor Inc Switching mechanism
US2494622A (en) * 1948-02-06 1950-01-17 Weston Electrical Instr Corp Contact arm for self-resetting magnetic contact relays
US2564416A (en) * 1949-03-14 1951-08-14 William A Wildhack Mechanoelectric transducer
US2874237A (en) * 1957-12-03 1959-02-17 Jr Bernard Edward Shlesinger Multiple contact switch
US3089923A (en) * 1959-06-15 1963-05-14 Endevco Corp Sectional digital switch
US3081383A (en) * 1959-10-30 1963-03-12 Panayotis C Dimitracopoulos Method and means for variable resistance recording
US3226495A (en) * 1962-10-04 1965-12-28 Fujitsu Ltd Rotary switch structure with saddleshaped insulator and two-legged contact brush

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4622658A (en) * 1983-01-27 1986-11-11 Ozen Corporation Simplified sound reproducing device having switchable circuits

Also Published As

Publication number Publication date
ES374538A1 (es) 1972-01-01
DE1959099A1 (de) 1970-11-12
DE1959099B2 (de) 1978-05-18
GB1296101A (enrdf_load_stackoverflow) 1972-11-15
FR2046071A5 (enrdf_load_stackoverflow) 1971-03-05
DE1959099C3 (enrdf_load_stackoverflow) 1979-01-25

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