US 2478346 A
Description (OCR text may contain errors)
Aug, 9, 949 H, C. VAN DOQRN 4789343 STARTING PHONOGRAPH MOTORS STARTING DEVICE FOR NONSELF Filed July 5, 1946 Patented Aug. 9, 1949 STARTING-DEVICE FOR NON-SELF-START- ING PHONOGRAPH MOTGRS Herman Cornelis Van Doorn, lands, assignor to Hartford Trust Company, Hartford,
Application July 3, 194.
Ingthe Netherland Section 1, Public La Patent expire Eindhoven, Nether- National Bank and C onn., astrustee 6, Serial No. 681,393 s August 4, 1943.
w 690, August 8.19462 s August 4, 1963 Though non-sel'f-starting motors, for instance synchronous motors in phonograph installations, have advantages over-the other usual types, since they operate at a constant speed without special precautions and, particularly since their manufacture is much cheaper, theyfnaturally have inherent therein the drawback that they cannot start automatically. For; instance, the turntable has tobeset in motion initially-either directly by hand or by means of-V a special mechanism when starting operation ofthe phonograph.
Start-ingA devices for' synchronous motors are known. These may comprise a spring which is first stretched and whose energy is then released for driving the mechanism, by means of, which the turntabler is set in motion andthe electric circuit of the motor` is completed. The spring is stretched by means of an arm, which is moved by hand andi is-loc'ked automatically, for instance by means of a pawl, at the end off thestroke. Only after thisbperation is; the phonograph` ready for use. The phonograph is started up by pressing a knob, as a result of which the aforesaid arm and the spring connected thereto are released. Owing tothe aforesaid release of the spring, the mechanism and finallyv the motor are set into motion. After that, th 'groove-scanner'has to be placed on the` record.
The present'invention concerns asimilar starting device but has for its purpose the simplificat'on of the operations for starting`f up the motor. According to the invention, this is achieved by carrying out the required operations exclusively by means of the arm of the groove scanner.
The device according to the invention is preferably designed in such a manner that the stretching and release of the said spring takes place by one outward displacement of the groove scanner. In this case the operation of the phonograph takes place similarly to the common automatic talking machines having self-starting motors, in whch the scanner is slightly turned outwards to start up the motor. In this respect the use of a synchronous motor outwardly corresponds entirely to that of a self-starting motor.
In order that the invention may be clearly understood and readily carried into eect, it will now be explained more fully with reference to the accompanying drawing, given by way of example and representing one embodiment thereof.
The sole figure represents a starting device according to the invention and according to the last-mentioned executional example. When the arm of the groove scanner I is moved outwards and is thus turned on the base 2 in the direction ofthe arrow 3 which The toothed segment k5 is -loosely movable about the shaft 3. The pawl 6, however, engages the ratchet kwheel 4v and is mounted on the segment 5 at the centre ofrotalrion 'I, so, that the notyet engage the segment 5, as long as the rubber driving wheel l5 which is rigidly secured to the pinion mediary of the shaft I4; stands free from the turntable. v'Line-said engagement only takes place when the pin I0,V which is mounted on the segment 5, abuts aga-inst' the cam IiI. As a result thereofY a small displacement of the lever I2; in which isv journalledthe. shaft I4V with the pinion 9 and the wheel I5; allows the,4 drawspring, I6,l to turn the lever Ii.'` over` suc pushedv against the turntable. VUpon this engagement a further vsmall` angular displacement of segment 5 results in that ther `pawl abuts against the pinA I I at 6a, Qwing, to this the pawl is moved away from theA ratchet Wheel` and remains in this position under the action. of the plate spring 8- which permits a permanent active and inactive position of' the pawl., The plate spring 8; in effect, is secured with a pin 8a to the segment and has such a length that both in the active and in the inactive position no couple is exerted on the pawl in contradistinction to all intermediate positions.
After the segment 5 has been disengaged from the ratchet wheel 4, the draw spring I8 becomes -operative and withdraws the segment in a direction opposite to that of the arrow. This results in that the pinion 9 is made to rotate which in its turn drives the wheel I5 engaging the turntable I9, so that the turntable I9 is made to rotate in the direction of the arrow B. At the end of the stroke the returning segment 5 disengages the pinion 9, through the intermediary of the pin 2li which abuts against the cam II and at the same time the contact between the wheel I5 and the turntable I 9 is removed. A suitable stop (not represented) provides that the lever I2 cannot be moved back too far by the spring I6. Upon abutment of the pin 2l) against the cam II a further angular displacement of the segment results in that the xed pin 2I engages the side 6b of the phonograph comprising tric motor, a turntable operatively connected thereto, a grooveV scanner arm operatively associated with said turntable, first means for set- Vtingrsaid non-self-starting electric motor in mopawl 6, so that the pawl is made to engage the ratchet wheel 4 again. At the same time the contact springs 22 and 23 are interconnected through a locking member 24 which is secured on a block of insulating material to the segment 5. This results in that the main voltage is applied to the motor which is now capable of continuing the driving of the mechanically started turntable.
What I claim is:
1. A starting device for a non-seli-starting phonograph comprising a non-self-starting electric motor, a turntable operatively connected thereto, a groove scanner arm operatively associated with said turntable, means for setting said non-self-starting electric motor in motion, and other means for initiating operation of said iirst means, said other means being mechanically linked to and positively actuated by manual movement of said groove scanner arm.
2. A starting device for a nonself-starting a non-self-starting Velection, second means for initiating operation of said iirst means, said second means being mechanically linked to and positively actuated by manual movement of said groove scanner arm,
randswitch means for said non-self-starting electric motor which are closed by manual movement `of said groove scanner ar 3. A startingl device for a non-self-starting `phonograph comprising a non-self-starting electric motor, "a turntable operatively connected thereto, a groove scanner arm operatively associated with said turntable, spring means for set- ',ting said non-lself-starting electric motor in motion, pawl and ratchet means for placing tension on saidspring means, said pawl and ratchet means being mechanically linked to and positively actuated by manual movement of said groove scanner arm, abutment means for rendering said pawl and ratchet means inoperative, and switch means for said non-self-starting electric. motorwhich are closed by manual movement of said groove scanner arm.
4. AY starting device for a non-self-starting -phonograph comprising a non-self-starting electricrmotor, .a turntable operatively connected thereto, a groove scanner arm mounted on a rod as a pivot to permit operative association with said turntable, Va ratchet wheel fixedly mounted on said rod, a, plate segment mounted for pivotal movement and having gear teeth at the circumferential edge thereof, a pawl movably mounted on said plate segment;v and operatively associated with said ratchet wheel, a pivotal mounting, a pinion thereon, a wheel operatively associated with said pinion, said pivotal mounting movable to a first position wherein said pinion is in engagement with said gear teeth and said wheel is in engagement with said turntable and movable to a second position wherein said pinion is out of engagement with said gear teeth and said wheel is out of engagement with said turntable.
5. A starting device for a non-self-starting phonograph as in claim 4 wherein abutment means are provided on said plate segment for engaging said pivotal mounting whereby said pivotal mounting is moved to said rst position in one position of said'plate segment and to said second position in another position ofsaid plate segment, stop means are provided which are operatively associated with said pawl mounted on said plate segment for moving said pawl into operative engagement with said ratchet in said another position of said plate segment and out of operative engagement with said ratchet in said one position of said plate segment, switch means for said non-self-starting motor are provided on said plate segment, said switch means being closed when said segment is in said another position, and spring means are provided for biasing said plate segment to said another position.
HERMAN CORNELIS VAN DOORN.
REFERENCES CITED The following references are otrecord in the le of this patent:
UNITED STATES PATENTS Number Name Date 1,136,739 Tiffany Apr. 20, 1915 1,238,168 McNulty Aug. 28, 1917 1,415,270 Smith May 9, 1922 1,665,890 Michl Apr. 10, 1928 1,667,794 Michl May l, 1928 FOREIGN PATENTS Number Country Date 397,877 Great Britain Sept. 1, 1933 426,65() Great Britain Apr. 8, 1935