US1400638A

US1400638A - Automatic phonograph-stop

Info

Publication number: US1400638A
Application number: US381847A
Authority: US
Inventors: Charles H Taylor
Original assignee: Individual
Current assignee: Individual
Priority date: 1920-05-17
Filing date: 1920-05-17
Publication date: 1921-12-20
Anticipated expiration: 1938-12-20

Description

C. H. TAYLOR.

AUTOMATIC PHONOGRAPH STOP. APPLICATION FILED MAY17,1920.

1,400,638, Patented 1090. 20, 1921.

a. liar CHARLES H. TAYLOR, 0'15 CROSBY, MINNESOTA.

AUTOMATIC PHONOGRAPH-SJIOP.

ousse.

application filed may 37,

To all whom it may concern.

Be it known that l, Crmnnns ll. TAYLOR, a citizen of the United States, and a resident of Crosby, in the county of Crow Wing, State of Minnesota, have invented a new and useful Improvement in Automatic Phon'ograph-Stops, of which the following is a full, clear, and exactdescription.

My invention relates to improvements in automatic phonograph stops, and it consists in the combinations, constructions, and arrangements herein described and claimed.

An object of my invention is to provide a stop for a phonograph or like sound repro ducing machine which is adapted to be automatically operated to stop the rotation of. the turntable when the direction of movement of the tone arm of the machine to which the stop is applied has been reversed.

A further object of my invention is to provide a device of the type described in which a disk record provided with an inner eccentric groove is employed to effect the reversal in direction of movement of the tone arm, whereby the device is operated to stop the sound reproducing machine.

A further object of my invention is to provide a device of the type described that will positively and instantly stop the operation of the sound reproducing machine to which applied when a needle carried by the tone arm reaches a predetermined point on the record.

A further object of my invention is to provide a device of the type described that normally prevents rotation of the turntable of the machine when the tone arm is out of operative position.

A further object of my invention is to provide a device of the type described that is relatively simple in construction and operation, not likely to get out of order easily, and thoroughly practical commercially.

Other objects and advantages will appear in the following specification, and the novel features of the invention will be particularly pointed out in the appended claims.

N y invention is illustrated in the accompanying drawings, forming part of this application, in which Figure 1 is a plan view of a portion of a sound reproducing machine showing the device applied, a portion of the parts shown being broken away,

Fig. 2 is a side view of the mechanism shown in Fig. 1.

Sp e cificati on of Letters Patent.

1920. Serial No. 381,847.

in carrying out my invention, 1 makeuse of a phonograph or like sound reproducing machine, a portion of the casing of which is denoted in the accompanying drawings by 1. A turntable 2 is mounted for rotation on the casing 1, a post 8 projecting above the central portion thereof. it tone arm l has a swivel connection at 5 with a supporting collar 6 which is secured to the casing 1 in an ordinary manner. The parts described so far are ordinary in construction and form no part of my invention, enceptin so far as they cooperate with the parts about to be described.

1 provide an arm '7 which is bent upwardly at 8 and then bent at 9 parallel to the main portion thereof. A bar 10 is rigidly secured to the upper portion in any suitable manner, as by welding, and cooperates with the end of the arm 7, which is bent at 9, to form a clamp. A horizontally extending-portion 11 of a bracket 12, which is secured by screws 13 to the tone arm 4, is received and clamped between the bar 10 and the end of the arm 7 which is bent at 9. 1-1 bolt or pin 14 extends through the bar 10, the horizontally extending portion 11, and the upper end of the arm 7. A nut 16 is screwed'on the end of the pin 14. A spring 15 is disposed between the nut 16 and the upper end of the arm 7., thereby exerting a tension against the latter which tends to prevent the arm 7 being pivotally moved about the pin 14. The tension of the spring 15 may be lessened or increased by operation of the nut 16. -it is to be noted that the arm 7 has a pivotal connection with the bracket 12, but that the free movement about its pivot is prevented by the clamping means described and by the provision of the spring 15. Consequently the arm 7 can be moved about its pivot only when a pressure has been applied at the free end thereof.

The free end of the arm 7 is formed with a slot 17. A stud 18, which is carried on the end of the lever 19, is disposed within the slot 17. A post 20, which is preferably covered with leather or a like material, is mounted upon the lever 19 adjacent its outer end in position to frictionally engage the edge of the turntable 2 when the device is in the po sition pictured in the accompanying drawings. The extreme outer end 21 of the lever 19 is formed, as pictured in the drawings, for convenience when it is desired to move the lever 19 by hand. A guide member 22 1 by means of screws 24.

The lever 19 has a pivotal connection at 26 with a bar 25, as best seen in Fig. 1. The

other end of the bar 25 is pivoted at 27 to a fixed member 28. The latter is rigidly secured to the casing 1 in the position p1ctured in the drawings by means of screws 29. A coil spring 34 has one end secured to the bar 25 adjacent its pivotal connection with the lever 19. The other end of the coil spring 3 1 is secured to the adjacent end of the fixed member 28, whereby tension is exerted by the coil spring to draw the bar 25 .in the direction of the fixed member 28, thereby tending to hold the post 20 against the edge of the turntable 2. A bumper 32, which is formed with an upwardlybent end 33 which is adapted to engage the side edge of the bar 25, is adjustably secured to the fixed member 28 by means of a set screw 30 which is disposed within a slot 31. The slot 31 extends substantially the entire length of the bumper 32 and permits adjustment of the same with respect to the bar 25, whereby the normal position of the post 20 may be regulated to positively prevent rotation of the turntable 2 when in the position illustrated.

From the foregoing description of the various parts of the device, the operation thereof may be readily understood. A disk record 35 is placed upon the turntable 2. The end 21 of the lever 19 is moved in the direction indicated by the arrow in Fig. 1. Since the lever 19 is located at one side of the center of the turn table 2 and is fulcrumed at 26, the movement of the end 21 of the lever 19 in the direction of the arrow will move the post 20 out of engagement with the edge of the turntable 2 and will also move cthe end of the arm 7 toward the center o1 the turntable againstthe influence of the clamping member 10 and the spring 15. The bumper 32 is secured in adjusted position by operation of the set screw 30, wherefore the movement of the bar 25 on account of the tension of the spring 34, is limited and the stop 20 is prevented from engaging the turntable 2 when moved in the direction of the arrow and is permitted to engage the turntable 2 when in initial position as shown. A needle (not shown) carried by the tone arm 1 is placed in position in the groove mto reproduce sound. While this needle is traversing the groove between 00 and y, the tone arm 1 will be moved in the direction of the center of the machine. The stud 18 will slide in the slot 17. Consequently, pressure will be exerted by the arm 7 against the stud 18 to maintain the inner end of the lever 19 in its position nearest the center of the turntable 2 during the entire time the tone arm 4. is being moved toward the center of the turntable 2. When the needle has traversed the groove y, it is diverted into an eccentric groove 36, which has been scribed in the record 35 in the position shown. The tone arm at will be moved to an extreme central position. The direction of its movement will thenbe reversed as the needle traverses the eccentric groove 36 and approaches the junction of the eccentric groove 36 with the groove 2 It is obvious that when the reversal in the direction of movement of the tone arm 41 occurs, pressure will be exerted by the arm against the stud 18 to move the inner end of the lever 19 away from the center of the turntable 2. Consequently the outer end 21 of the lever 19 will be moved into the position pictured in the accompanying drawings. The post 20 will trictionally engage the edge of the turntable 2, instantly and positively stopping the rotation of the same and will be maintained in operative engagement therewith by the tension of the spring 34.

Many adaptations and modifications of the form of the device pictured in the accompanying drawings may obviously be provided without departing from the spirit and scope of the invention as set forth in the foregoing disclosure and outlined more particularly in the appended claims. I there fore consider such adaptations and modifications as my own.

I claim:

1. The combination with a sound reproducing machine including a turntable and a tone arm, the free end of the tone arm being arranged to be moved in one direction when the turntable is being rotated, of a lever fulcrumed on the casing of the sound reproducing machine, one end of th lever being arranged to extend beyond the outer edge of the turntable, means carried by said lever adjacent its outer end forfrictionally engaging the turntable to prevent the rotation thereof, means for normally holding said first named means in engagement with the turntable, means operated by the move- 115 ment of the tone arm in one direction for maintaining said first named means out of engagement with said turntable and operated by the movement of the tone arm in the direction opposite to that first men- 120 tioned for moving said first named means into engagement with said turntable, whereby the rotation of the latter is stopped, and means for effecting a reversal in the direction 01" movement of said tone arm.

2. The combination with a sound reproducing machine including a turntable and a tone arm, the free end of the tone arm being arranged to be moved in one direction when the turntable is being rotated, of a 130 lever fulcrumed on the casin of the sound reproducing machine, one enc of the lever being arranged to extend beyond the outer edge of the turntable, means carried by said lever adjacent its outer end for frictionally engaging the turntable to prevent the rotation thereof, adjustable means for normally holding said first named means in engagement with the turntable, means operated by the movement of the tone arm in one direction for maintaining said first named means out of engagement with said turntable and operated by the movement of the tone arm in the direction opposite to that first mentioned for moving said first named means into engagement with said turntable, whereby the rotation of the latter is stopped, and means for effecting a reversal in the direction of movement of said tone arm.

8. The combination with a sound reproducing machine including a turntable and a tone arm, the free end of the tone arm being arranged to be moved in one direction when the turntable is being rotated, of a lever fulcruined on the casing of the sound reproducing machine, one end of the lever being arranged to extend beyond the outer edge of the turntable, means carried by said lever adjacent its outer end for frictionally engaging the turntable to prevent the rotation thereof, adjustable means for normally holding said first named means in engagement with the turntable, means operated by the movement of the tone arm in one direction for maintaining said first named means out of engagement with said turntable and operated by the movement of the tone arm in the direction opposite to that first mentioned for moving said first named means into engagement with said turntable, whereby the rotation of the latter is stopped, and means for efiecting a reversal in the direction of movement of said tone arm, said last named means including a disk record disposed on said turntable to rotate therewith, said record having an inner groove eccentrically arranged with respect to the center of the turntable.

CHARLES H. TAYLOR