US1231431A - Driving mechanism for talking-machines. - Google Patents

Description

H. ROSENBAUM.

DRIVING MECHANISM FOR TALKING MACHINES.

APPLICATION FILED OCT. 2-], 1916.

Patented June 26, 1917.

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APPLICATION FILED OCT. 21.1916.

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Patented June 26, 1917.

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HELLMUTI-I ROSENBAUM, OF BROOKLYN, NEW YORK.

DRIVING MECHANISM FOR TALKING-MACHINES.

Specification of Letters Patent.

Patented June 26, 1217.

Application filed October 21, 1916. Serial No. 126,986.

To all whom it may concern:

Be it known that I, HELLMUTH ROSEN- BAUM, a citizen of Germany, and resident of the borough of Brooklyn, county of Kings, and State of New York, have invented certain new and useful Improvements in DrivingMechanisms for Talking- Machines, of which the following is a full, clear, and complete specification, being had to the accompanying drawings, wherein- Figure 1 is a sectional view on line 11, indicated in Fig. 2, showing the driving mechanism in front elevation;

Fig. 2 is a sectional view on line 22, indicated in Fig. 1, showing the, driving mechanism in side elevation;

Fig.3.is a fractional top view of a. talking machine;

Fig. 4 is a sectional view on line 44, in .dicated in Fig. 1, and showing a top view of the driving mechanism;

Fig. 5 is a fractional sectional view on line 55, indicated in Fig. 3, detail (drawn on an enlarged scale) showing the indicator, and the braking mechanism combined therewith.

The springactuated mechanisms for driving the record disk of a talking machine are subject to the defect, that notwithstanding the means provided for regulating the speed, there is always a variation in the speed, resulting from the variation in the propulsive forceof the spring, which the regulating devices are not capable of overcoming. By reason thereof the speed of the disk is noticeably greater at the start and correspondingly diminished toward the end, as the spring is more and more unwound. While this variation of speed does not very seriously afiect the reproduction of the ordinary songs or musical renditions, the reproductions of finer instrumental music, for'instance, instrumental solos, are detrimentally affected thereby.

The object of my invention is to eliminate this defect, and to provide a driving mechanism having a constant speed, slower or faster, as the mechanism may be adjusted, from the start to the end. The further object of my invention is to provide a driving mechanism for talking machines, which ismore capable of being regulated according to the requirements of the song or musical composition, or instrumental rendition. To this end, my inven reference tion consists of the driving mechanism, in which a suspended weight is utilized for its motive force, and means are provided for maintaining a' constant speed, whether slower or faster, as the rendition of a song, or of instrumental music, may require.

Referring to the drawings, illustrating an embodiment of my invention, the numeral 7 designates the main shaft, whereon a gearwheel 8 is loosely mounted, the tape or rope pulley 11, and the ratchet wheel 9, being fixed thereto. Shaft T is journaled in bearings 10, provided in, or aflixed to, one in the front wall 12, and the other in the partition wall 13,- of the box of the talking machine, the two walls, in conjunction with the top plate 14 and the bottom plate 15, forming a casing, in which the driving mechanism is inclosed. An intermediate shaft 16 is similarly mounted in bearings set also in the front wall 12 and the partition wall 13 of the box of the machine, and the pinion 17, meshing with the cog-wheel 8, and the cog-wheel 18 meshing with the pinion 19, are fixed thereto. Pinion 19 is fixed to the driven shaft 20, having one end mounted in a bearing set in the front wall 12 of the machine, and the other, inner end, in the bearing 21 secured to the top plate 14 of the machine, as shown in Fig. 2. A bevel gear 22 is afiixed to this inner end of the shaft 20. This gear meshes with the bevel gear 28, fixed to the inwardly projecting end of the stud or vertical shaft 24, rotatably mounted in the bearing 25, fixed in the top plate 14 of the box of the machine. The plate 26, supporting the record disk 27 is affixed to the upwardly projecting end of the stud 24, and means are provided for fixing the record plate thereon.

The. weight 28, actuating the driving mechanism is connected by tape 29 with the pulley 11, and a crank 30, having a handle 31 afiixed to its free end, is fitted upon the squared end of the shaft 7 to enable this shaft to be turned so as to raise the weight 28 preparatory to starting the driving mechanism in action. Instead of squaring the end of shaft 7, and providing a correspond ing bore in the hub of the crank 30, the shaft may be left round and a pin set thereon to engage with a recessor cam, pro vided on the hub of the crank 30. to enable the shaft 7 to be rotated by moving the crank in one direction, id cat, when the tape 29 is to be wound up on the pulley 11,

and to permit its reverse rotating when the weight 28 is unwinding the tape in driving the mechanism, while the crank stands still.

The ratchet wheel 9 with the pawl 32, pivoted to the cog-wheel 8, and pressed against the ratchet wheel 9 by the spring 331, constitute the coupling, whereby the cog-wheel 8 is made to rotate with the shaft 7, when the driving mechanism operates, as hereinbefore ex lained. This cog-wheel 8 meshes with the pinion 17 fixed on the shaft 16, whereon also the cog-wheel 18 is fixe l. The latter meshes with the pinion 19, fixed on the driving shaft 20, and thereby this driving shaft is rotated. The bevel gear 22, meshing with the bevel gear 23, transmits this rotary motion of the shaft 20 to the plate 26, whereon the record disk 27 is fixed. The several parts of the driving mechanism are so proportioned to each other, that four turns of the shaft 7 produce three hundred revolutions of the shaft 20 (and of the plate 26 and disk 27) which is considered sufficient for theplaying of all records of the ordinary size.

The speed. regulating device is shown in Figs. 2 and 4, and is constructed as follows:

A stationary collar 33 is fixed to the shaft 20, and a sliding collar 34, connected to the stationary collar 33 by flexible links 35,

made of tempered springs or in the form of toggle joints, is slidably mounted on the flanged stationary sleeve 37. The weights 36 are secured to-the links 35 approximately midway between their ends, or in the apexes of their pivotal joints. The extent of the sliding motion of the collar 34 is limited by the flange 38 on the stationary sleeve 37, with which the collar 34 comes in frictional contact when, by the rotating of the shaft 20 and the centrifugal force thus on the weights 28, the joints of the links 35 are drawn out.

For varying the tempo in playing diverse records a brake mechanism is connected with the indicator 39, mounted on the top plate of the box of the machine. This brake mechanism is shown in enlarged detail in Fig. 5, and comprises the flanged pulley 40, fixed to the shaft 20, the screw-threaded stem 41, .to which the brake arms 42 are connected as shown in the aforementioned Fig. 5, and the interiorly screw-threaded sleeve 43,

which is rotatably set in the plate 44, se-

cured to the top plate 14 of the box of the machine, and is held by.it against vertical movement. The pointer 39 is integral with the sleeve 43, or rigidly fixed thereto, and, by turniiig the sleeve 43, the stem 41, which is in screw-tln'eaded engagement therewith, but held against turning by the engagement of the brake arms 42 between the flanges of the brake pulley 40, is raised or lowered correspondingly, according to in which direction the sleeve 43 is turned. For better convenience a knob 45 is formed on the upper end of the sleeve 43, and the letters S and F are engraved on the plate 44 indicating slow and fast respectively, and the pointer 39 shows in which direction the sleeve 43 (or knob 45) is to be turned, when slower or faster playing is desired. The brake arms 42 contact with the face of the brake pulley 40, more so when the sleeve 43 is turned to the left (toward the letter S) the stem 41 being thereby projected from the sleeve, to exert a stronger braking action. lVhen the sleeve 43 is turned to the right (toward the letter F) the stem 41- is receded into the sleeve 43, and the pressure of the brake arms 42 on the pulley 40 is released.

The mechanism for stopping the plate 26 (and the record disk 27 fixed thereon) when the record is played out, is devised for the purpose of effecting a gradual stopping of the mechanism, and to prevent a shock and the attendant vibration, which would otherwise occur in consequence of abruptly stopping its motion. This stopping mechanism is constructed as follows:

A crank lever 46 is pivoted on stud 47, secured to the top plate 14 of the box of the machine, as shown in Fig. 3. One arm of this lever 46 is shaped to receive the frictional block 48, preferably made of rubber, and the arm is shaped, and thepivot 47 so located, that the frictional block 48 may be moved to and from the periphery of the plate 26 by a comparatively short motion of the other arm of the crank lever 46. A second bell crank lever 49 is pivoted at 50 in the lug 51, affixed to the underside of the plate 14, and one arm of this lever 49 projects through the slot 52, provided in the plate 1.4, and also in the top plate 53 (see Fig. 3). This arm of lever 49 contacts with the longer arm of lever 46, as shown in Figs. 1 and 3. The other, horizontally disposed arm of the lever 49 is pivotally connected with the rod 54, (see Fig. 1) terminating into a treadle or abutment 56. Rod 54 passes through the bore 55 of the weight 23, and when the weight 28, sliding on the rod 54, comes in contact with the treadle 56 at the end of its descent, it acts on the treadle 56 and then the rod 54 pulls down the horizontal arm of the bell crank lever 49 against the resistance of the spring 57. Thereby the vertical arm of the lever 49, projecting through the slot 52, pushes against the longer arm of lever 46 and the frictional block 48 is moved toward, and pressed against, the periphery of the disk 26. The

extent, before the treadle 56 is depressed to the level of the partition 15 of the box, and consequently, also the pressure of the friction block 48 on the periphery of the disk 26. Thereby a gradual and complete stopping of the actuating mechanism and of the disk 26 is effected before the motor is run down entirely.| Springs 57 (see Fig. 1) and 58, connecting respectively the arms of the levers 49 and &6 to the fixed pins 60 and (51, maintain also the lever 46 in the position shown in Fig. 3 (away from the periphery of the plate 26) and raise the treadle 56 from the bottom plate 15 of the box of the machine, when the driving mechanism is again wound up, as explained above. The springs 57 and 58 counteract, to a sufiicient extent, the action ofthe weight 28 upon the treadle 56, whereby the retarding action of the friction block 48 upon the periphery of the plate 26 is graduated. They thus assist in effecting the above explained purpose of the stopping device. \Vhen the Weight 28 is raised from the treadle 56, the springs 57 and 58 raise the treadle 56 and return the bell crank levers 46 and 4:9 to their normal position, withdrawing the friction block 48 from the periphery of the disk 26, which is then free again to rotate, when the driving mechanism is set inoperation, as above described.

I claim as my invention 1. A driving mechanism for talking machines, comprising a motor'operated by a weight; a stud rotatably mounted in the top plate of the box of the talking machine, means operatively connecting the stud with the motor, and a support for securing a record disk thereto; a stopping device mounted on the top plate of the box in position to engage the support of the record disk, and means for operating the stopping device by the weight which actuates the driving mechanism before the motor is run down; substantially as herein shown and described.

2. A. driving mechanism for talking machines, comprising a motor operated by a a weight; a stud rotatably mounted in the top plate of the box of the talking machine; a plate fixed thereon; a bell crank lever fulcrumed on the to plate of the box in position to engage the plateaflixed to the stud; means for yieldingly holding the lever away from the plate, and automatic means, actuated by the weight operating the motor, for moving the lever and pressing it against the edge of the plate mounted on the stud, immediately before the motor is run down; substantially as herein shown and described.

3. The combination with the driving mechanism for talking machines, designed to be actuated by a weight, of stop mechanism for the rotatable support of the disk, the stop mechanism comprising a bell crank lever pivoted to the top plate of the box of the machine in proximity to the rotatable support, whereon the record is secured; a frictional block secured to one arm of the bell crank lever; a slot in the top plate of the box, a lug aflixed to the underside of the top plate adjoining the slot; a bell crank lever pivoted in the lug and having one arm projecting through the slot to engage the other armof the bell crank lever mounted on the top plate; a rod pivotally connected to the other arm of the bell crank lever; an abutment on the other end of the rod, in position to be engaged by the weight, and springs connected to the arms of the levers and set to draw the levers into their normal position, in which the friction block is withdrawn from contact with the rotatable disk support, when the weight acting on the abutment is raised; substantially as herein shown and described.

HELLMUTH ROSENBAUM.

Witnesses PAULA Barns, LoUIsE KELLER.

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