US1881967A

US1881967A - Phonograph

Info

Publication number: US1881967A
Application number: US386247A
Authority: US
Inventors: Thomas E Piazze
Original assignee: Technidyne Corp
Current assignee: Technidyne Corp
Priority date: 1929-08-16
Filing date: 1929-08-16
Publication date: 1932-10-11
Anticipated expiration: 1949-10-11

Description

T. E. PIAZZE Oct. 11, 1932.

PHONOGRAPH Filed Aug. 16, 1929 3 Sheets-Sheet l H l l l l l H Hhl H lH l l l l lfll lll AI miiiimini INVENTOR Thomas E. Pmzze I T ATTORNEYS T. E. PIAZZE Oct. 11, 1932.

PHONOGRAPH Filed Aug. 16, 1929 3 Sheets-Sheet 2 INVENTOR Thomas E. Pmzze ATTORNEYS T. E. PIAZZE PHONOGRAPH Filed Aug. 16 1929 3 SheetsSheet 5 2 Q m F 8 m 6 D4. am W m I, IV. I m ma v re A: m; m

INVENTQR Thomas E. P1022:

BY j ATTORNEYS Patented Oct. 11, 1932 UNITED STATES PATENT OFFICE THOMAS E. PIAZZE, OF BROOKLYN, NEW YORK, ASSIGNOR TO TECHNIDYNE CORPORA- TION, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK PHONOGRAPH Application filed August 18, 1929. Serial No. 888,247.

This invention relates to phonographs, and more particularly to an automatic trip for stopping or for initiating the record changing or record repeating operations in a phonograph.

The primary object of the present invention is to provide an automatic trip mechanism for phonographs the action of which will not require a preliminary setting to determine the stopping point, and yet which will be entirely reliable and uniform in its operation.

Phonograph records at the present time" terminate in a variety of ways, some having a terminating groove which is eccentric, others having concentric terminating grooves interconnected with the last sound groove by a :relatively high pitch spiral, while many records have no special form of terminating groove. One object of the present invention is to provide an automatic trip the operation of which will be accurately and reliably responsive to any of these various types of rec ords. In the case of those records having eccentric or spiral terminating grooves there is an acceleration of the reproducer at the end of the record, and in the case of records without a special terminating groove there is a dwell period in which the reproducer assumes a stationary condition. In either case there is a change in the reproducer movement at the end ofthe record, and in accordance with my invention this change in the motion of the 'reproducer is taken advantage of ,to initiate the desired operation of the phonograph trip mechanism.

Only a relatively slight amount of energy is available from the movement of the reproducer in the record grooves, and a further object of my invention is to make available a moderate or more substantial amount of trip energy which is merely controlled rather than developed by the change in movement of the reproducer,.and to this end I utilizemotor energy, and preferably the rotation of the record turn table during the playing of the ,record, to store up trip energy, preferably by tensioning a resilient means. The storing or energizing relation between the turn table and the resilient means driven thereby may be initiated in response to the normal reproducer travel during the playing of the record, and at the end of the record the .change in the rate of reproducer movement already described is utilized to release the purpose a trip impulse amplifying meanswhich makes it possible to obtain a trigger action of rather considerable force. My invention has as further objects, first, to improve the trip impulse amplifying mean. there disclosed, and second, to arrange for the effectual combination of such an amplifying means with the tripping means of in present invention. To this end the method of operation of my automatic phonograph trigger includesstoring upample or sufiicient trigger energy under the influence of a driving motor, preferably the phonograph driving motor during a record changing operation, thereafter storing up a moderate amount of trip impulse energy also under the influence of a driving motor, preferably through the rotation of the record turn table during the playing of the record, then utilizing a change in the reproducer movement at the end of the record to release the trip impulse energy, and finally utilizing the trip the trap copen ing application, Ser. No. 357,444, filed 7 A ril 23,1929.

o the accomplishment of the foregoing and numerous other objects which will hereinafter appear my invention consists in the tripping method, the trip mechanism and its elements, and their relation one to the other, as hereinafter are more particularly described in the specification and sought to be defined in the claims. The specification is accompanied by drawings in which: I

Fig. 1 is a broken plan view of automatic phonograph mechanism embodying my invention;

Fig. 2 is a perspective view of the trigger mechanism;

Figs. 3, 4, 5, and 6 illustrate successive. phases in the operation of the automatic trip means;

Fig. 7 is a sectional elevation through the gle breaking and resettin mechanism;

ig. 8 is a plan view 0 an alternative and preferred form of my invention;

Fig. 9 is a detail of the follower thereof; Fig. 10 is a fragmentary section taken in the plane of the line 1010 in Fig. 8; and

Fig. 11 is a sectional elevation taken through the toggle breaking and resetting mechanism.

Referring to the drawings, the automatic phonograph trip comprises a. trip means A which is reciprocable, .and which is preferably moved by rotation'of the motor driven record turn table B at a rate commensurate with the reproducer motion when the latter is traveling in the record sound grooves. The trip further comprises follower means C which is moved in direct response to the travel of the reproducer D across the record. Additional means, preferably in the form of an extension or lever E on trip means A, is provided for disengaging the trip means A from the turn table B when the reproducer experiences a change in rate of movement, for such a change is detected by the relative movement of the follower C and the lever E, and releases the trip impulse energy reviously stored up by the motor driven turn table B in a resilient means F. When trip means A is released the resulting trip impulse may be used directly, or, if desired, may be used to break the toggle of a trip impulse amplifying means G in order to obtain a still more powerful trigger movement for operating, for example, a clutch H to initiate a record changing operation.

Considering the arrangement in Figs. 1 through 7 more in detail, the trip means A preferably consists of a block 2 formed integrally with a sleeve 4 which is freely reci rocable upon a rotatable shaft 6, a ortion 0 which is threaded, as at 8. The blocii 2 carries a lever 10 pivotally mounted thereon which is operatively connected with movable teeth 12, preferably by forming the teeth directly on a portion of the lever 10. The teeth 12 are of proper pitch to mate with the thread 8, and the pivot 14 of the lever 10 is so located that when the teeth- 12 engage the thread 8 they tend .to remain in engagement. However, this tendency is limited, and the pivot 14 is kept quite close to the thread in order that it may be kept very slight so that a very light touch will release the teeth 12 from the thread 8. A very li ht spring 16 also tends to turn lever 10 cloc wise, and so to bring the teeth 12 into engagement with the thread 8.

The turn table B, which has been cut away to illustrate some of the mechanism located therebeneath, carries a record 20 provided with sound grooves beginning with the groove 22 and ending with the groove 24. The particular record here shown is terminated with an eccentric terminating groove 26 into which the reproducer D rides at the end of the record. The reproducer is carried by an oscillatable reproducer arm 30, mount ed on a vertical sleeve 32, which at a level below that of the turn table, carries an arm 34 fitted with a pivoted finger 36, urged to the illustrated out-stretched position by a spring 38, this assemblage constituting the follower mechanism generally designated C. Finger 36 is pivoted as shown to permit the reproducer to be swung to its outermost position for beginning a new record, without arm 34 being stopped by striking block 2.

The arrangement is such that after the reproducer D is brought into motion by the playing grooves of the record,.an'd preferably only after the record has been partially played, say after the passage of-150 grooves of a 10inch record, the finger 36 bears against the block 2 and presses it slightly toward the right. There is but little resistance to movement at this time because the coil spring F is almost completely expanded. Upon a slight movement of block 2 the teeth 12 come opposite the beginning of the thread 8 and spring 16 brings them into engagement, after which the threaded shaft 6 takes up the movement of block 2 and continues moving it in order to store up trip impulse energy by compressing the coil spring F.

Shaft 6 is power driven, preferably by the regular motor of the phonograph, and in the present case is rotated through the turn table shaft 40, driven by a motor, not shown in the drawings. Shaft carries a worm 42 meshing with a worm gear 44 which rotates a gear 46 meshing with an intermediate gear 48, the latter rotating a pinion 50 which drives a gear 52 on the threaded shaft 6. The gear ratio and the pitch of the thread 8 are so selected that the tripping means A is moved at a rate coinciding with the normal rate of movement of the follower means C. This feature presents no difficulty because the pitch of the playing grooves in most of the makes of disc records is standard, being very close to 98 threads per inch.

As the record is played there is a change in the rate of transverse movement of the tip of finger 36 relative to the edge of lever 10, owing to the increasing angularity of the follower lever 34, and the trailing edge of lever 10 is therefore properly curved so that the finger 36 will closely follow it with very little clearance throughout the playing of the record.

This is best illustrated in connection with Figs. 3, 4, and 5, referring to which it will be observed that in Fig. 3 finger 36 has just moved block 2 sufficiently to brin teeth 12 into engagement with thread 8. he movement of trip means A is thereupon taken up by the thread, as is illustrated in Figs. 4 and 5, and finger 36 follows the trailing edge of lever 10 very closely throughout the playing of the record.

When the reproducer D enters the terminating groove of a record having a special terminating groove, such as a spiral of high pitch, or an eccentric groove like the groove 26 shown in Fig. 1, the reproducer is accelerated and consequently moves the follower means C at a rate faster than the movement of trip means A, the latter continuing to move its normal amount, proportional to the rotation of the turn table. Finger 36 therefore presses against lever 10 and moves it about pivot 14 so as to disengage teeth 12 from thread 8. The action is sensitive, and

almost instantaneously trip means A is reciprocated to the left by the compressed spring F. The trippin movement of trip means A is not hampered by lever 10, which may pivot as far as necessary to permit it to slide for a portion of its length freely past the end of finger 36, as is illustrated in Fig. 6, which shows trip means A reciprocated entirely to the left and in contact with bearing 7 of shaft 6.

In this embodiment of my invention the thread 8 is terminated at a point along shaft 6 corresponding-to the smallest usual diameter of the sound grooves in the various makes of records, and at the termination of the thread the shaft is made to again assume its full diameter. In consequence of this, when trip means A is carried by the thread and reaches the end thereof without having been tripped by reproducer acceleration in a special terminating groove, the teeth 12 ride out of the thread and the stored up trip energy is released. Hence a record not provided with a special terminating oove is nevertheless automatically stopp Also, should the reproducer fail to enter the special terminating groove of a record the phonograph trip will nevertheless be actuated after the passage of a short interval of time.

In general, it is obvious that myform of trip may be made exceedingly sensitive, for but very slight load is placed upon the reroducer for initiating the trip impulse.

he energy for the trip impulse is in reality supplied b the phonograph motor, and is stored up during the p aying of the record. In order that the trip impulse may be uniform re ardless of slight differences in the travel 0 the trip means A it is referable that the spring F be made relative y long, so that there is only a slight variation in its compression when the trip means is released at different points.

In order to strengthen the trip impulse, and to make it perfectly uniform regardless of the time of trip ing, I may use the trip means so far descri ed with a trip impulse amplifying means G. This arrangement consists of a main trigger for actuating clutch H, and a relatively stifl' s ring 62 tending to operate the trigger 60. he sprin 62 is opposed by any suitable barrier, pre erably in the form of a tog le consisting of a toggle arm 64 pivoted to tie trigger shaft 66, a toggle arm 68 pivoted on a fixed ivot 70, an extension 72 of toggle arm 64 or looking the toggle at slightly beyond dead center, and a bell crank extension 74 on toggle arm 68 arran ed in the path of movement of pin 76 on bloc 2 for breakin the toggle in order to release spring 62 ant? so to actuate trigger 60.

The arrangement as here illustrated is applied to the automatic record changing phonograph of Lester L. Jones described in the copending applications already referred to, the said phonograph employing an (soillatable record turn table for the discharge and loading of records. To this end the turn table mechanism includes and is mounted upon a plate 80 which is journalled in fixed bearings 82, the table being oscillated about the axis of the bearings 82 by a crank 84 and connecting rod 86, one end of which is carried on the crank pin of crank 84, and the other end of which is anchored in a fixed bearmg.

The trigger energy is stored up under motor drive, and is preferably stored up during the record changing operation.

The manner in which this is done, and the toggle reset, is best illustrated in connection with Figs. 2 and 7. Referring to Fig. 2 it will be observed that there is a fixed cam surface 90 which is so positioned relative to the location of the extension 72 of the toggle in position.

the parts 0 arm 64 that when the toggle is broken and the turn table is tilted the extension 72 bears against cam surface 90 and is reset thereby. In Fig. 6 the pin 76 is shown to have just struck the bell crank extension 74 on to gle arm 68 and thereby broken the toggle, w do in Fig. 7 extension 72 on toggle arm 64 has come into contact with the cam surface 90. Obviously the radius of the cam surface 90 is diminished relative to the position of the toggle extension 72, so that during the oscillation of the turn table. the extension 72 is forced past dead center back into contact with fixed pivot the toggle then locking itself pring 62 has meanwhile been tensioned by the resetting of the toggle.

Fig. 2 also illustrates a fixed cam 92 the function of which will next be explained. The automatic phonograph is preferably equipped with re ect means or manually operable means for stopping or initiatin a record changing operation at any time uring the playlng of a record. In such case the turn table may be oscillated and a record changed without trip means A having been released to its initial position and, of course,

it will then be tripped at an inopportune time during the playing of the next record. It is therefore desirable to insure that whenever the turn table is oscillated for the discharge of a record the trip means he released, regardless of what caused the oscillation of the turn table, and this is the function of cam 92, the edge 94 of which is so shaped that when the turn table is oscillated the lever 10 comes in contact therewith and is thereby moved in the proper direction to disengage the teeth 12 from the thread 8, and thus release spring F and trip means A to the starting position.

It will also be observed in Fig. 2 that arm 34 is preferabl made relatively flexible and that the back e ge 35 of finger 36 is preferably sloped as shown in the drawings. This arrangement revents jamming or breaking of f the mechanism 1n case someone should so interfere with its automatic operation as to succeed in having the turn table re-- stored to its playin position while the reproducer arm is hel inwardly instead of being swung outwardly to the beginning of the record, in which case finger 36 might be found located inside instead of outside of lever 10. \Vith the arrangement as here shown it then is still possible to swing the reproducer outi wardly to its initial playing position, for finger 36 will oscillate about its pivot and sloping surface 35 will cause flexible arm 34 to yield downwardly as the reproducer arm is swung outwardly.

The foregoin trip mechanism functions very reliably with any type of record, and functions with extreme sensitiveness for records having special terminating grooves, but has a relatively sluggish response in the case of records having no special terminating groove. A noticeable and somewhat undesirable period of time elapses before trip means A travels the full length of thread 8, because to prevent premature trip ing this thread must be carried along sha 6 to a point corresponding to the smallest customar diameter of sound oove.

o overcome this di culty I may provide instead of or in addition to the means so far described for operation with records having no special terminating groove additional means which operates promptly regardless of the diameter of the last record groove and which preferably operates in response to relative movement of the follower means and the trip means, just as in the case of records having a special terminating groove. When the reproducer enters the last oove of a record having no special terminating groove the reproducer dwells or becomes stationary, and in such case the trip means moves relative to the follower means instead of the follower means moving relative to the trip means, as is the case when the reproducer enters a special terminating groove. I so modify the trip mechanism already described that relative movement of the follower and the trip means, regardless of which moves faster than the other, will operate to disengage the trip means from its driving means an so release the stored up trip impulse energy.

Such an arrangement is illustrated in Fig. 8 of the drawings, referring to which it will be observed that trip means A is in this case provided with two extensions or

arms

10 and 110, and that pin or finger 136 of follower means C is adapted to move between the

arms

10 and 110, as at 110'. Am 10 is pivoted on a pivot 14 and is urged in a clockwise direction by a light spring 16, thereby tending to cause engagement of teeth 12 with thread 8 on drivin shaft 6. Lever 110 is pivoted at 114 an carries an extending finger 96 which is arranged to bear against a finger 98 on lever 10 so that clockwise movement of lever 110 causes counter clockwise movement of lever 10 and release of trip means A. The range of motion of lever 110 is defined by stops 100 on block 2.

Lever 134 of follower C carries at its outer extremity a pivoted finger or extension 135, which after the reproducer has been moved a suitable distance in playin contact with the record, say 150 grooves o a 10" record, bears against a lower shoulder 102 on block 2 and serves to move the block slightl to the right. The finger 135 is pivoted as s own to permit the finger to yield slightly during the return movement of the reproducer preparatory to playing a new record. After the preliminary motion of block 2 the teeth 12 are brought into en agement with thread 8 by spring 16 and ereupon the movement of tri means A is taken up by shaft 6.

' eanwhile pin 136 has ocated itself being shaft 6 with tri means A, and the downward movement 0 arms lO and 110 is arrested b a downwardly extendin pm 260 fixed to block 2 of trip means A w ich, asis best shown in Fig. 10, rests against the edge 202 of the bed plate 80 of the oscillatable phonograph mechanism. At the time this action first takes place levers IQ and 110 are relatively widely separated, as 1s illustrated in Fig. 8, but the moment the thread takes up the drive of trip means A levers 10 and 110 are brought together by the operation of spring 16 and b the engagement of the teeth with the threa so that the levers are then positioned closely to the pin in the manner illustrated in Fi 9, lever 10 resting in a recess in pin 136 or a reason subsequently to be described.

In operation it will be understood that when the reproducer enters a special terml- 3:) nating groove the motion thereof causes pin 136 to move lever 10 counter clockwise, thereby disengaging teeth 12 from-thread 8 and releasing the stored up trip impulse ener On the other hand, should the record not equipped with a special terminating groove,

when the reproducer enters the last oove thereof it will remain stationary and t e pm 136 will dwell. However, the rotation of the turn table B willcontinue to move trip means A and with it lever 110, and the resulting impulse energy. And

clockwise motion of lever 110 will, throug fingers 96 and 98, move lever 10 counter clockwise, and so disengage teeth 12 from thread 8, thereby releasin the stored up tri nally, if desire thread 8 instead of being carried indefinitely may be terminated at a desired minimum, playing radius so that tripping will always be caused at this radius regardless of whether or not the

levers

10 or 110 have been actuated.

The modification illustrated in Figs. 8 through 11 differs from that illustrated in Figs. 1 through 5 in several other ways which perhaps may best be described by considering the changes in one relative to the other. In place of the cam 92 in Fig. 2 there is used merely the inconspicuous cam surface 210, best shown in Figs. 9 and 10 of the drawings. Reflection will show that should the record changing operations be initiated manually, the movement of lever 10 past cam surface 210 due to the oscillation of the entire turn table mechanism about the axis of bear- ,13 in g 212 will cause lever 10 to be moved slight- -eter 242. When the ly counter clockwise, and trip mechanism A will thereby be released.

The trip impulseamphffiigg means G is somewhat similar to that ady described except that in this case the extension 72 on the toggle arm 64 is used solely to lock the toggle at dead center, and not for resetting purposes. The toggle arm 68 is formed integrally with a sleeve 214 fixed to a shaft 216 carried in bearings 218. The shaft 216, at theend adjacent the trip means A, carries an upwardly extending pin 220 which is of suflicient length to be ged by pin 76 on block 2 in order to break the toggle. The remote and of shaft 216 carries a downwardly extending pin 222 which is in alinement with a manually movable plunger 224, movgment of which serves also to break the tog e.

o reset the toggle and to store energy in the to e spring 62 a fixed flat cam 230 is provi e an edge 232 of which is engaged by pin 220 after the toggle has been broken and during the resulting oscillation of the turn table mechanism about bearing 212. The movement of pin 220 along cam edge 232 restores the pin from the position shown in dotted lines m Fig. 8 to a vertical position, which at the same time resets the toggle and compresses spring 62.

The embodiment shown in Fi 8 also differs slightly in the spring F, w ich is here shown as having a portion of smaller diameter 240, and a portion of larger diamrem'oducer first begins to move trip means A the resistance encountered is only that of portion 242, and is very slight indeed due to the increased diameter of the coils. After the motor drive begins to take up the movement of trip means A the end of sleeve 4 of the trip means bears against the end of sprin portion 240 and thus serves to compress t e portion of the spring which has greater resistance.

The correct gear ratio and rate of travel of trip means A is here obtained by the use of on y a single set of gears, consistin of gear 246 meshing with gear 252 mounte on shaft 6, gear 246 corresponding to gear 46 in the arrangement shown in Fig. 1.

The mode of operation and constructionand the advantages of my automatic trip will for the most part be apparent from the foregoing description thereof. It is obvious that a trip means is provided which is responsive to any type of record regardless of the form of special terminating oove which it has, and regardless of whet r or not it has any special terminating groove. It also will be apparent that while movement of the reproducer is used to initiate the desired tri impulse, the actual trip impulse energy is stored up from motor driven means, and if desired, as in the case of a record changing phonograph, this storing up of energy may be in several stages so as to ultimately obtain as powerful and as uniform a trip or trigger im ulse as may be desired.

t will be apparent that while I have shown and described my invention in the preferred form, many changes and modifications may be made in the method and structure dis.- closed without departing from the spirit of the invention, defined in the following claims.

I claim:

1. An automatic phonograph tri comprising motor driven means to provi e trip energy, and means responsive to a change in the rate of uni-directional movement of the reproducer at the end of the record to release the trip energy. a

2. An automatic phonograph trip system comprising a motor, means driven thereby to store u trip energy, means responsive to the repro ucer movement during the playing of a record to initiate the storing up of trip energy by the motor, and means responsive to a change in the movement of the reproducer to release the stored up trip energy.

3. An automatic phonograph trip comprising means driven by rotation of the record turn table to provide trip energy during the, playing of a record, and means responsive to a change in the movement of the reproducer at the end of the record to release the trip enerah 4. automatic phonograph trigger system comprising a motor, means driven thereby to store up relatively powerful trigger energy, means driven b the motor to pro- ,vide moderate trip im pu se energy, means responsive to a change in the movement of the reproducer at the end of the record to release the trip impulse energy, and means responsive to the trip impulse to release the trigger ener 5. an automatic phonograph trigger system comprising a motor, means driven thereby to store up trigger'energy, means driven by rotation of the'record turntable for providin trip impulse energy during the play ing 0 a record, means responsive to a change in the movement of the re roducer at the end of the record to release t e trip impulse ener and means responsive to the trip im- P so to release the trigger energy.

6. Trigger mechanism for an automatic record changing phonograph comprising means to store up trigger energy during the record changingoperation, means driven by rotation of the record turn table to provide trip impulse energy during the playing of a record, means responsive to a change in the movement of the reproducer at the end of the record to release the trip impulse energy, and means responsive to the trip impulse to release the trigger ener in order to initiate the next record changing operation.

7. An automatic phono aph trip comprising driven means actuate by rotation of the turn table for provi trip impulse ene follower means mo in response to t e travel of the reproducer across the record, and means for disengaging the driven means in order to release the trip im ulse energy when the relative speeds of the 'ven means and the follower means substantially difier.

8. An automatic phonograph trip comprising driven means actuate by rotation of the turn table for providin trip impulse energy, follower means move in response to the travel of the reproducer across the record, means for disengaging the driven means in order to release t e trip impulse energy when the relative speeds of the driven means and the follower means substantially difl'er, as atthe end of a record, and additional manually operable means for releasing the tri impulse energy at any time during the playing of the record.

9. An automatic phonograph trip comprising driven means actuated by rotation of the turn table for providi trip impulse energy, follower means move in response to the travel of the reproducer across the record, and means for disengaging the driven means in order to release the trip impulse energy when the speed of the follower means exceeds that of the driven means.

10. An automatic phonogra h trip comprising driven means actuated y rotation of the turn table for trip impulse energy, follower means moved in response to the travel of the reproducer across the record, and means for disengaging the driven means in order to release the trip impulse energy when the speed of the driven means exceeds that of the follower means.

11. An automatic phonograph trip comprising reci rocable trip means moved by rotation of t e record turn table against resilient means tending to move the trip means in the opposite direction, follower means movin in response to the travel of the reproducer or following the trip means during the playing of a record, and means to release the tri means from actuation by the turntable, sai release means being responsive to relative movement of the follower means and trip means so as to release th trip means from the turn table in order to obtain the desired trip impulse from the resilient means when the reproducer rides in the last groove in the record.

12. An automatic phonograph trip com prising reciprocable trip means moved by rotation of t e record turntable against resilient means tending to move the trip means in the opposite direction, follower means moving in response to the travel of the reproducer for following the trip means during the playing of a record, and means to release the trip means from actuation by the turntable, said release means being responsive to relative movement of the follower means and trip means so as to release the trip means from the turntable in order to obtain the desired trip impulse from the resilient means when the reproducer is either accelerated or stationary, so as to be responsive to records having various terminating ves.

13. An automatic phonograph trip comprising reciprocable trip means, resilient means tending to move the trip means in one direction, means driven by the record. turntable for moving the trip means in the opposite direction against the force of the resillent means, follower means moving in response to the travel of the reproducer for followin the trip means during th playing of a recor and means to release the trip means from the driven means, said release means being responsive to relative movement of the follower means and trip means so as to release the trip means from the driven means in order to obtain the desired trip impulse from the resilient means when the reproducer is accelerated, as by riding in an eccentric or spiral terminating groove in a record.

14. An automatic phonograph trip comprising reciprocable trip means, resilient means tending to move the trip means in one direction, means driven by the record turntable for moving the trip means in the opposite direction, followermeans moving in response to the travel of the'reproducer for following the trip means during the playing of a record, and means to release the trip means from the driven means, said release means being responsive to relative movement of the follower means andtrip means so as to release the trip means from the driven means in order to obtain the desired trip impulse from the resilient means when the reproducer is stationary, as by riding in the last groove of a record having no s ecial terminating groove.

15. An automatlc phonograph trip comprising reciprocable trip means, resilient means tending to move the trip means in one direction, means driven by the record turntable for moving the trip means in the opposite direction against the force of the resilient means, follower means moving in response-to the travel of the reproducer for following the trip means during the playing of a record, and means to release the trip means from the driven means said release means being responsive to relative movement of the follower means and trip means so as to release the trip means from the driven means in order to obtain the desired trip impulse from the resilient means when the reproducer is accelerated, as by riding in an eccentric or spiral terminating groove in a record, or when the reproducer is stationary, as by riding in the last groove of a record having no special tenninating groove.

16. An. automatic phonograph trip comprising reciprocable trip means, resilient means tending to move the trip means in one direction, means driven by the record turntable for moving the trip means in the opposite direction against the force of the resilient means, and means for releasing the trip means from the driven means at a point corresponding to the smallest customary sound groove diameter, in order to obtain the desired trip impulse from the resilient means.

17. An automatic phonograph trip comprising reciprocable trip means, resilient means tending to move the trip means in one direction, means driven by the record turntable for moving the trip means in the opposite direction against the force of the resilient means, follower means moving in response to the travel of the reproducer for following the trip means during the playing of a record, and means to release the trip means from the driven means, said release means being responsive to relative movement of the follower means and trip means so as to release the trip means from the driven means when the reproducer rides in an eccentric or spiral terminating groove in the record, and means for releasing the trip means from the driving means at a point corresponding to the smallest customary sound groove diameter, in order to obtain the desired trip impulse, whether or not the record has a special terminating groove.

18. An automatic phonograph trip comprising reciprocable trip means, resilient means tending to move the trip means in one direction, means driven by the record turntable for moving the trip means in the opposite direction, follower means moving in response to the travel of the reproducer for following the trip means during the playing of a record, and means to release the trip means from the driven means, said release means being responsive to relative'movement of the follower means and trip means so as to release the trip means from the driven means when the reproduceris either accelerated or stationary, and means for releasing the trip means from the driving means at a point corresponding to the smallest customary sound groove diameter, in order to obtain the desired trip impulse, whether or not the record has a special terminating groove.

19. An automatic phonograph trip comprising reciprocable trip means carr ing a pivoted lever operatively connected with movable teeth, a threaded shaft driven by the record turntable for moving the trip means when the teeth are engaged in the thread, rcsilient means for moving the trip means in the opposite direction when the teeth are disengaged from the thread, follower means moving adjacent the lever in response to the travel of the reproducer, whereby dwell of the follower caused by the reproducer reaching the last groove of a record moves the lever and disen gas the teeth a... the thread, in order to o tain a trip impulse.

20. An automatic phonograph tnp comprisingl reciprocable trip means car g a pivote lever operatively connecte with movable teeth, a t readed shaft driven by the record turntable for moving the trip means, when the teeth are engaged in the thread, against resilient means tendin to move the trip means in the opposite irection, follower means moving ad] acent the lever 1n response to the travel of the reproducer whereby acceleration of the follower caused by the reproducer reaching an eccentric or spiral terminating groove moves the lever and disengages the teeth from the thread, in order to obtain a trip impulse.

21. An automatic phonograph trip comprising reciprocable tri means carrying a pivoted lever operative y connected with movable teeth a threaded shaft driven by the record turntable for movin the trip means when the teeth are engagedm the thread, resilient means for moving the tri means in the opposite direction in order to o tain a trip impulse when the teeth are disengaged from the thread, follower means moving ad'acent the lever in response to the travel of t e reproducer, whereb acceleration of the follower caused hy t e reproducer reaching an eccentric or s iral tenmnating groove moves the lever an disengages the teeth from the thread, said thread terminating at a point corrrespondin to the smallest customary sound groove diameter, so that the teeth are disengaged from the thread even if the record has no/special terminating groove.

22. An automatic phonograph trip comprising reciprocable trip means carrying an extension operatively connected with movable teeth, a threaded shaft driven by the record turntable for movin the tri means when the teeth are engage in the t read, resilient means for movingthe trip means in the opposite direction when the teeth are disengaged from the thread, and follower means moving along with the extension in response to the travel of the reproducer, said follower means and extension being so operatively related that relative movement in either direction of the follower and the extension disengages in the teeth from the thread, in order to obtain a trip impulse at the end of any type of record. v t

23. An automatic phonograph trip comprising reciprocable trip means carrying an extension operatively connected with movable teeth, a threaded shaft driven by the record turntable for moving the trip means when the teeth are engaged in the thread, resilient means for moving the trip means in the opposite direction when the teeth are disengaged from the thread in order to obtain a trip impulse, follower means moving along with the extension in response to the travel of the reproducer, said follower means and ex tension being so operatively related that relative movement in either direction of the follower and the extension, as at the end of a record, disengages the teeth from the thread,

and additional manually o rable means for disengaging the teeth and t read at any time during the playing the record.

24. An automatic phonograph trip comprising reciprocable trip means carrying a space pair of pivoted levers operative y connected with movable teeth, a threaded shaft driven by the record turntable for moving the trip means when the teeth are engaged in the thread, resilient means for moving the trip means in the opposite direction when the teeth are disengaged from the thread, follower means moving between the levers in response to the travel of the reproducer, whereby acceleration of the follower, as by the reproducer reaching an eccentric or spiral terminating groove, moves one of the levers and disen ges the teeth thereon from the thread, and well of the follower, as by the reproducer reaching the last groove of a record having no special terminating groove, moves the other lever and disengages the teeth from the thread, in order to obtain a trip impulse at the end of any type of record.

25. An automatic phonograph tri ger comprising reciprocable trip means, resi ient means tending to move the trip means in one direction, means driven by the record turntable for moving the trip means in the opposite direction against the force of the resilient means, follower means moving in response to the travel of the reproducer for following the trip means during the laying of a record, and means to release t e trip means from the driven means, said release means being responsiye to relative movement of the follower means and trip means so as to release the trip means from the driven means in order to obtain a trip impulse when the reproducer rides in the terminating groove of a record, and tri impulse amplifying means comprlsing a trigger, resilient means tending to actuate the trigger, and means responsive to movement of the trip means for permitting the resilient means to actuate the trigger.

26. An automatic phonograph trigger comprising reciprocable trip means, resilient means tending to move the trip means in one direction, means driven by the record turntable for moving the trip means in the opposite direction, follower means moving in response to the travel of the reproducer for following the trip means during the playing of a record, and means to release the trip means fromthe driven means said release means being responsive to relative movement of the follower means andtrip means so as to release the trip means from the driven means in order to obtain a trip impulse in response to relative movement in either direction caused when the reproducer either accelerates or dwells, and trlp impulse amplifying means comprising a trigger, resilient means tending to actuate the trigger, a barrier preventing actuation of the trigger, and means responsive to movement of the trip means for releasing the barrier and permitting actuation of the trigger.

27. An automatic phonograph trigger comprising reciprocable trip means, relatively light resilient means tending to move the trip means in one direction, means driven by the record turntable for moving the trip means in the opposite direction, follower means moving in response to the travel of the reproducer for following the trip means during the playing of a record, and means to release the trip means from the driven means said release means being responsive to relative movement of the follower means and trip means so as to release the-trip means from the driven means in order to obtain a trip impulse when the reproducer rides in the terminating groove of a record, and trip impulse amplifying means comprising a trigger, relatively heavy resilient means tending to actuate the trigger, a toggle barrier preventing actuation of the trigger, and means responsive to movement of the trip means for breaking the toggle and permitting actuation of the trigger.

28. An automatic record changing phonograph trig er comprising reciprocable trip means, resi ient means tending to move the trip means in one direction, means driven by the record turn table for moving the trip means in the opposite direction, follower means moved in response to the travel of the reproducer for following the trip means during the playing of the record, and means to release the trip means from the driven means, said release means being responsive to relative movement of the follower means and trip means so as to release thetrip means from the driven means in order to obtain a trip impulse when the reproducer rides in the terminating groove of a record, and trip impulse amplifying means comprising a trigger, resilient means tending to actuate the trigger, a toggle barrier preventing actuation of the trigger, means responsive to movement of the trip means for breaking the toggle and permitting actuation of the trigger in order to initiate a record changing operation, and additional means responsive to the record changing operation for resetting the toggle.

29. An automatic phonograph trigger system comprising a motor, means driven thereby to store up trigger energy, means respon- "sive to a change in the rate of uni-directional movement of the reproducer at the end of the record to release the trigger energy, and

manually operable means to release the trig- V ger energy at any time during the playing of the record.

30. An automatic phonograph trigger system comprising a motor, means driven thereby to store up trigger energy, means driven thereby for providing trip impulse energy, means responsive to a change in the movement of the reproducer at the end of the record to release the trip impulse energy, means responsive to the tri impulse to release the trigger energy, and manually operable means to release the trigger energy at any time during the playing of the record.

Signed at New York in the county of New York and State of New York this 13th day of August A. D. 1929.

THOMAS E. PIAZZE.