US2479975A - Control device for turntables - Google Patents

Description

Aug. 23, 1949. J. J. SHIVELY CONTROL DEVICE FOR TURNTABLES 5 Sheets-Sheet 2 Filed March 2, 1944 Tami.

- INVENTOR. .J/LT: \I 571 i'a'e CONTROL DEVICE FOR TURNTABLES Filed March 2, 1944 3 Sheets-Sheet 5 .1? i for)? 965 Patented Aug. 23, 1949 UNITED STATES PATENT OFFICE CONTROL DEVICE FOR TURNTABLES John J. Shively, New York, N. Y.

Application March 2, 1944, Serial No. 524,764

4 Claims.

The present invention pertains to improvements in control devices.

In Patent No. 2,261,420 and Application Serial No. 383,904, filed March 18, 1941, now Patent Number 2,340,147, are described and claimed telephone answering and recording devices in which the various functions are controlled cyclically by a cooperative group of cams and switches.

An object of the present invention is to provide improved means to carry out a cyclic operation A further object is to provide means of the above characteristics in which releasing clutches, and the like, are eliminated.

A further object is to provide means of the above type in which a gradual braking effect is applied to the motor to shorten the latters coasting period.

Another object is to provide means of the above type in which the torque transmission between the motor and control elements is limited, whereby both are protected against injury in case of any interference with operation of the control elements.

A still further object is to provide apparatus of the above nature which is simple, cheap, and easily manufactured.

Other objects and advantages of the invention will become evident during the course of the following description in connection with the accompanying drawings, in which E Figure 1 is a longitudinal view taken partly in section through the plane of the worm and turntable shaft axis;

Figure 2 is a longitudinal view in section in the plane of the control shaft;

Figure 3 is a front elevation;

Figure 4 is a rear view of the rear cam and stop pin; and

Figure 5 is an electrical diagram illustrating typical connections of the motor, release solenoid and their respective switches.

Referring to Figure 1, the numeral l0 denotes a vertical shaft journalled in a casing l l and carrying a worm l2 meshing with a worm-wheel 83. A record turntable I4 is secured on the upper end of the shaft l0 and is adapted to be 2 rim-driven by a motor I 5, Figure 3, via a resilient idler pulley or roller l6. As the details of such roller drives are well known in the art and form, in themselves, no part of the present invention, no further description is necessary herein.

Referring to Figure 2, the worm-wheel i3 is secured to a sleeve l1 journalled in the casing I l. A horizontal shaft I8 is rotatably mounted in the sleeve ll. Secured on the front end of the shaft I8 is a flanged hub l9 carrying a plurality of cams 20, 20 20 and 20 Obviously, the cams can be made in a Single piece, but in the present embodiment they are made individually, preferably as stampings, spaced apart by phenolic washers 2| and all secured to the flanged hub 19 by bolts 22. The cams 20, 20 etc. are adapted to control switches 23, 23 23, 23, and 23 of any suitable type, herein illustrated as the type well known in the art as microswitches.

The rear end of the sleeve l1 carries a driving flange 24. A driven disc 25 is secured to the rear end of the shaft l8, and a resilient friction washer 26, preferably of spring bronze or the like, is disposed in compression between the driving flange 24 and the driven disc 25. A small pin 21 is fixed in and protrudes from the rear face 28 of the disc 25. The disc 25 may have peripheral cam surfaces 29 and 30 engaging tappet levers 3i and 32, Figure 1, these levers being adapted to perform any desired functions in the device to be controlled by the present invention and being shown herein for purposes of illustration.

The main casing l l is secured to an upper supporting plate 33, from which also depends a bracket 34 carrying a solenoid 35. A fiat bellcrank 36 is pivoted to the bracket 34, the horizontal arm 31 of the crank being articulated to the plunger 38 of the solenoid 35. When the solenoid is deenergized, as in Figure 1, the relatively vertical arm 39 of the bell-crank 36 rides against the rear face 28 of the driven disc 25 and is adapted to be laterally engaged by the pin 21, thus acting as a detent.

Figure 5 illustrates typical electrical connections by which the cyclic operations of a device embodying the invention may be controlled. Referring to that figure, numerals 40 and 4| denote conductors of a source of current. A multiple contact relay 42 is connected on one side via a wire 43, a momentary contact switch 44 and a wire 45 to the supply conductor 40. The other side of relay 42 is connected via wires 46 and 41 and cam switch 23 with the second supply conductor 4|. The switch 23 is normally held closed by the notched cam 20*, the apparatus being ly referred to.

3 illustrated in normal or stop position of the cyclic operation.

One normally open contact 48 of the relay 42 is connected on one side to the wire 43 and on the other via leads 49 and 50 to the conductor 45. The lead 50 is also connected to one side of the normally open cam switch 23, the latter being controllable by the notched cam The other side of switch 23 is connected via leads 5| and 52 to a second normally open contactor 53 of relay 42, thence via a wire 54 to the conductor 40.

The lead 52 is also connected to the motor l5 and the solenoid 35. The motor I5 has a return connection 55 to conductor 4|, while solenoid normally has a return connection to conductor 4| via leads 56, 51, and the normally closed cam switch 23. It will be noted that the cam 25 has a short lobe 58 adapted to hold the switch 23 closed only in a short arc of revolution including stop position and a short rotary travel from that position. It will also be noted that the cam 29 has a short notch 59 which allows the switch 23 to open near the end of a cyclic operation and just prior to closure of switch '23 by cam lobe 58.

The relay 42 may have any desired number and character of contacts for controlling various circuits of the device requiring cyclic operation, such as the telephone recording devices previous Similarly, the cam switches 23 and 23 may control any desired circuits, being included herein to illustrate the fact that the present invention is applicable to any required number and combination of cyclic circuit control means.

A typical operation is as follows:

When the switch 44 is momentarily closed, either manually or by any suitable relay means, the relay 4 2 is energized through its connections previously described. As relay 42 closes, its contactor 48 completes a holding circuit from conductor via leads 5!] and 49 to wire 43, this circuit being parallel to switch 44 and therefore adapted to hold the relay energized when the switch 44 is opened Closure of relay 42 also completes a circuit from conductor 40 via lead 54, contactor 53 and lead 52 to the motor 5, thence through return lead 55 to supply conductor 4|. At the same time the solenoid 35 receives current via lead 52, the solenoid circuit being completed through leads 56, 51 and cam switch 23.

As the motor I5 starts, it drives the turn-table l4, Figures 1, 2 and 3, and through the latter the shaft l0, worm l2, worm-gear I3, sleeve l1, and

driving flange 24. As the solenoid 35 is energized,

it raises the plunger 38, withdrawing the bellcrank detent 39 from the stop-pin 21 and allowing the disc 25 to be rotated. The driving hub 24 drives the disc 25 through the medium of the friction washer 25, thus revolving the shaft I8 and its attached cams.

Referring to Figure 5, when the cam 20 has been rotated a few degrees in the cyclic or clockwise direction, the lobe 58 allows switch 23 to open, deenergizing the solenoid 35. This allows the plunger 38 to drop, carrying the detent 39 again against the disc 25 as shown, but as the pin 21 has been moved forward past the detent 39, the cam assembly continues to revolve without interference throughout the cycle.

Near the end of one complete revolution the cam 20 allows the switch .23 to open momentarily, breaking the return connection from relay 42 to conductor 4| and causing the relay 42 to open.

However, the cam 2|! holds the switch 23 closed at this point, thus maintaining the motor circuit independently ,of the relay 42. Shortly thereafter the notch 59 in cam 2i! allows the switch 23 to open, deenergizing the motor I5. Immediately thereafter the pin 21, carried by the momentum of the motor 5 and other rotating parts, engages the bell-crank arm 39 and is stopped thereby, causing the entire cam assembly to be stopped accurately in normal position. Meanwhile, the friction washer 25 allows the driving disc 24, worm gearing, shaft 5 and motor l5 to revolve until their momentum is absorbed, thus avoiding any sudden shock to these parts.

The washer 26 is so proportioned that its frictional effect is sufiicient to prevent rotary slip between the driving flange '24 and driven disc 25 during normal operation of the various switches, cams, etc., associated with the shaft I8, so that during the cyclic operation of the device the cam and switch operation takes place in positive relation. When the pin 2'! has engaged the arm or detent 39, however, subsequent rotation of the driving parts is resiliently decelerated by the frictional braking action of the washer 25. The washer 26 thus allows precision stopping of the control cam and switch combination precisely at the end of a complete revolution, and also acts as a brake to bring the driving motor and connected parts to rest in minimum time following the completion of an operating cycle. The latter function is advantageous in many applications, for instance, in the case of an automatic telephone answering and recording device, in which completion of one telephone recording may be followed quickly by another.

From the foregoing it is evident that the apparatus described provides a precision onerevolution control device, without releasing clutches or similar complicated apparatus, while at the same time providing means to brake the motor and driving parts to rest without shock at the conclusion of the operative cycle.

While the device has been set forth in preferred form and applied to a certain control combination for purposes of illustration, it will be understood that the invention is not limited to the exact apparatus and application described, as various modifications may be made without departing from the scope of the appended claims.

What is claimed is:

1. In a device of the character described, in combination, a rotary driving member, power means operatively connected to said driving member, said power means includin means to accumulate a substantial momentum additive to that of said driving member, a rotary driven member, control means positively connected to said driven member, means between said members to frictionally transmit motion from said driving member to said driven member, and normally engaged means controllable by said control means to positively stop said driven member after a predetermined rotation of said driven member, said frictional member allowing limited rotation of said driving member subsequent to said stoppage of said driven member, means to energize said power means, and means controllable by said control means to de-energize said power means whereby said predetermined rotation is completed by said momentums.

2. In a recording device, in combination, a plurality of switches adapted to control operative functions of said device, a shaft, means on said shaft to actuate said switches in cyclic succession, a motor, frictional driving means operatively disposed between said motor and said shaft whereby said motor may drive said shaft and said actuat ing means throughout a predetermined rotative cycle, stop means to hold said shaft stationary against the urge of said frictional driving means in a predetermined rotative position of said shaft, electrical means to disable said stop means, and means to complete a circuit through one of said switches to said motor and a second circuit through another of said switches to said disabling means, said actuating means being adapted to open said second switch shortly after the start of said cycle and to open said first switch prior to completion of said cycle.

3. In a recording device, in combination, a rotary drivin member, a motor adapted to rotate said member, a rotary driven member, frictional driving means operatively disposed in permanent relation between said members, means to normally hold said driven member in a predetermined rotative position, electro-magnetic means to disable said holding means, a source of current, means to simultaneously energize said motor and said disabling means whereby said driven member may be rotated out of said predetermined position, means to de-energize said disabling means immediately after rotation of said driven member out of said stop position, and means to de-energize said motor immediately prior to rotation of said driven member again into said stop position, the momentum of said motor operating through said driving means to complete rotation of said driven member into said stop position.

4. The combination claimed in claim 3 wherein said energizing means includes a relay and wherein said first and second de-energizing means include breakers operable by said driven member independently of said relay.

JOHN J. SHIVELY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,930,159 Crilly Oct. 10, 1933 1,974,207 Ellinger Sept. 18, 1934 2,013,649 Colman Sept. 10, 1935 2,079,837 Buckley May 11, 1937 2,085,442 Newell June 29, 1937 2,094,777 Ellinger Oct. 5, 1937 2,334,965 Thacker Nov. 23, 1943

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