US1753505A

US1753505A - Driving mechanism for turntables of talking machines

Info

Publication number: US1753505A
Application number: US332480A
Authority: US
Inventors: John W Dyer
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-01-14
Filing date: 1929-01-14
Publication date: 1930-04-08
Anticipated expiration: 1947-04-08

Description

J. W. DYER April 8, 1930.

DRIVING IECHANISM FOR TURNTABLES OF TALKING MACHINES Filed Jan. 14, 1929 w MWL mw m. M WW a W23 M m M M 4 I .9 MW a I H j 1 M! H./, I Q, W11! H r U y w M m m a m m m INVENTQW ATTORNEY 4 z a W &

a .m w 4 wman wiwrvw z 5| FLIP QM Patented Apr. 8, 1930 1 UNITED STATES JOHN W. DYER, OF EAST ORANGE, NEW JERSEY DRIVING MECHANISM FOR TURNTABLES F TALKING MACHINES Application filed January 14, 1929. Serial No. 332,480.

My invention relates to improved mechanism for driving the turntables of talking machines and preferably where such talking machines are utilized in connection with motion pictures where it is necessary that the sound record and the film shall operate in synchronism.

In an application of Frank L. Dyer. Apparatus for reproducing sound records, filed January 2, 1929, Serial No. 329,800, there is shown an apparatus including two turntables adapted to be operated alternately, the driving mechanism being intended to actuate either turntable at a speed which shall correspond to and be in synchronism with the projected film and providing means also by which either turntable may be operated at a slightly higher speed and preferably at a slightly lower speed whereby the sound record may be brought into synchronism with the film, when for any reason the two become non-synchronous.

' My invention provides driving mechanism which is somewhat simpler in construction than that disclosed in said application and wherein the use of ratchets and pawls is dispensed with.

Broadly stated, my invention comprises a turntable which is normally driven by means of a friction drive in combination with gear ing and also in providing for a somewhat higher speed. which when brought into action, will cause the turntable shaft to turn slightly faster than and with respect to said friction drive. The invention also preferably utilizes a second gearing, which when brought into action will slightly retard the turntable shaft with respect to said friction drive. 40 In order that the invention may be better understood, attention is directed to the accompanying drawing forming part of this specification, and in which- Figure 1 is. a vertical elevation, partly in section, of driving mechanism embodying my improvements.

Figure 2 is a vertical section through the turntable shaft and driving elements thereon. Figure 3 is a section on the line 3-3 of Figure 1.

In the drawings, corresponding parts are represented by the same reference numerals. I here show only a single turntable 1, although preferably two turntables will be employed as disclosed in said application, operated in alternation whereby when the sounds recorded on one have been reproduced, the other may be immediately started to thus provide continuous sound reproduction. The

turntable 1 is carried by shaft 2 mounted in meshing with gear 14 loose on the driven or turntable shaft 2. The latter shaft is driven from gear 14 through

friction disks

15, 15 splined on the turntable shaft 2 and held frictionally in engagement with the surfaces of said gear by adjustable springs 16, as shown particularly in Figure 2. This provides for the normal or synchronous speed of the turntable 1.

In order to provide for a slightly higher speed, I make use of a gear 17 keyed to shaft 12 and meshing with gear 18 loose on the turntable shaft 2. The gear ratio between 17 and 18 provides for a slightly higher speed than between gears 13 and 14. In order to connect the gear 18 with the turntable shaft 2, I may employ a toothed ring 19 on the gear 18 adapted to be engagedby a toothed ring 20 on a collar splined to the shaft 2. This collar may be actuated bya yoke 21 and hand lever 22. Whenthe rings 19 and 20.are engaged together, it will be seen that the gear 18 will turn the shaft 2 at a slightly higher speed, causing the

friction disks

15, 15 to advance in respect to the gear 14; I

To provide for a slightly lower speed I employ a gear 23 keyed on driving shaft 12 meshing with gear 24 loose on the turntable shaft. The gear 24 may be connected to the turntable shaft 2 through

toothed rings

25 and 26 corresponding with the

rings

19 and 20. The

rings

20 and 26 considered together, constitute a collar 27 before referred to. By operating the lever 22, the

toothed rings

25 and 26 will be engaged whereby the turntable shaft will be rotated at a slightly lower speed than normal through the operation of the

friction disks

15, 15 which w1ll slide slowly in a rearward direction with respect to the gear 14. In other words, the low speed gearing acts in effect as a brake devlce to bring about a somewhat lower speed than that normally effected by the gearings 13 and 14. Normally the lever 22 may be held in a central position by a double spring 28, as shown.

Any suitable mechanism may be substituted for connecting the turntable shaft 2 with either gear 20 or 24: and if desired, electric mechanism may be employed for the pur pose, as disclosed in said application.

Having now described my invention, what I claim as new therein and desire to secure by Letters Patent, is as follows:

1. The combination with a turntable and a driven shaft connected therewith, of a driving shaft, friction means between the shafts for rotating the driven shaft, normally disconnected gearing between said shafts, and means for connecting said gearing whereby the driven shaft will be turned at a slightly higher speed with respectto said friction means.

2. The combination with a turntable and a. shaft connected therewith, of a driving shaft, friction means between said shafts for driving thedriven shaft, normally disconnected gearing between said shafts providing for a slightly higher speed, and clutch mechanism for connecting said gearing with the driven shaft.

3. The combination with a turntable and a shaft connected therewith, of a driving shaft, friction means between said shafts for driving the driven shaft at normal speed, normally disconnected gearing between said shafts, and means for connecting said gearing with the driven shaft whereby the driven shaft will be retarded and caused to be driven at a slightly lower speed.

4;. The combination with a turntable and a driven shaft connected therewith, of a driving shaft,,friction means between said shafts for driving the driven shaft at normal speed, normally disconnected gearing between said shafts, and clutch mechanism for connecting said gearing with the driven shaft whereby said shaft will retarded and be driven at a slightly reduced speed.

5. The combination with a turntable and a shaft connected therewith, of a driving shaft, friction means between said shafts driving the driven shaft at normal speed,

gearing between said shafts providing for a slightly higher speed, a second gearing between said shafts providing for a slightly JOHN W. DYER.