US2267198A

US2267198A - Sound recording and reproducing machine

Info

Publication number: US2267198A
Application number: US339751A
Authority: US
Inventors: Harris Edward Robert
Original assignee: Individual
Current assignee: Individual
Priority date: 1940-06-10
Filing date: 1940-06-10
Publication date: 1941-12-23
Anticipated expiration: 1958-12-23

Description

Dec. 23, 1941, E. R. HARRIS ,2 7, 9

SOUND RECORDING AND REPRODUCING MACHINE Fil ed June 10, 1940 5 Sheets-Sheet 1 MICROPHONE MENTOR EEPRODUCING HEA T BY Arroe/ws 5/.

- Edward'R Harris Dec. 23, 1941. v E. R. HARRIS SOUND RECORDING AND REPRODUCING MACHINE 5 Sheets-Sheet 2 Filed June 10. 1940 nil-mum INVENTOR. Edward R. Harris 19 TTORNE y.

Dec. 23, 1941. R. HARRIS SOUND RECOR DING AND REPRODUCING MACHINE 5 Sheets-Sheet 3 lfiled June 1 0. 1940 1 3 9.5.

mm mm l8 ,M/ a w INVENTOR. Edward 1?. Harris BY Wm 'M J M NEZ Dec.23, 1941.- E HARRIS 2,267,198

SOUND RECORDING AND REPRODUGING MACHINE Filed June 10, 1940 5 Sheets-Sheet 4 E'dward E Harris Dec, 23, 1941. E. R. HARRIS, 2,267,198

SOUND RECORDING AND REPRODUCING MACHINE Filed June 10, 1940 5 Sheets-Sheet 5 ATTORNEY.

Patented Dec. 23,- 1941 UNITED STATES PATENT OFFICE- SOUND nscon gl aeraonucmc v I t ricwarc Robert Harris, I... Angeles, Calif.

Application June 10, 1940, No. 839,751

6 Claims.

My invention relates to sound recording and reproducing machines wherein the records are made on disks, flat strips or cylinders of material wherein the sound record is made by a stylus excavating a sound groove in the material of a record holding body.

The constructions here shown are applied to a disk record body. Certain functional units of mechanism, relating chiefly to the stylus mounting herein shown, can be adapted to be used on flat strip record bodies and also on cylindrical bodies.

An object of my invention is to provide a' compact, portable unit complete in itself which is adapted to record and reproduce and to play back the standard, commonly used form of sound records of the disk type, known asvariable, rotational speed records, useable with the ordinary phonographs which are out in service.

In addition to what is set forth above a further object of my invention is to provide means for making and usingdisk sound records wherein the sound groove is uniform as to the length of speed of travel of the sound groove under the stylus on any portion of the record body.

with the common disk record the sound groove travel under the stylus is much faster at the margin of the disk than at the central small diameter of the record.

with myinvention there is mechanism for producing a differential rotary speed imparted to the revolution speed of the disk.

A prime object of my invention is to provide ahighly efficient, light weight, simple and low cost instrument which may be used successfully by any one, being as nearly as possible a fool proof instrument.

A further object of myinvention'is to provide mechanism which may be easily and quickly adjusted to play back either ofthe above described types of sound groove records as relates to disk records and to do this without changes which require any special tools.

A further object of my invention is to provide special electrical mechanisms for rotating the turn table on whichthe record disks are carried.

Another object of my invention is to provides special emcient recording and play back stylus holding mechan sms which are adapted to produce and play back sound grooves of the highest;

quality.' 7,

Another object of my mwnaaais to provide Fig. 1 is a plan across below the turn table on line l'l ofFig. 6 with parts broken away fo cleamess of illustration.

Fig. 1a shows a wiring diagram of the electrical conductor wiring as relates tothe wiring from the stylus head.

Fig. 1b is a plan of the rocker frame member or carriage on which the mechanisms for revolv ing the turn table are can'ied.' I

Fig. 2 is an elevation partly in sectionon line 2-2 of Fig. 1.

Fig. 3 is an elevation on line 3-3 of Fig. 1 showing details of gearing.

Fig. 4 is a sectional elevation on line 4-4- of Fig. 1. I

Fig. 2a is a sectional elevation on line 2a-2a of Fig. 1.

Fig. 5 is a sectional elevation on line 5-5 of Fig. 1.

- Fig. 6 is a sectional elevation on line 86 of Figl 9 is a plan sectional detail on line 8-9 of Fig. 6.

Fig. 10 is a longitudinal, vertical, central, partially sectional elevation through the stylus hold-j ing mechanisms.

a Fig. 11 is a plan of what. is shown in Fig. 10

with the enclosure box and parts in section.

Fig. 12' is a-vertical section on line .l2-l2 of Fig. 10..

Fig. 13 is a left end view looking from the left toward the right of Figs. '10 and 11 with parts broken away. I

Fig. 14 1s a left side elevation of the machine. Fig. 15 is a front elevation of the machine.= In the drawings a disk .recordD is indicated in outline by dotted lines in Fig. i. In Fig. 6 the disk is shown as a central portion in vertical section. The disk is supported on a turn table '1 of suitable diameter in relation to the disk which it supports.

The turn table T is mounted on a tubular shaft 2 and is fixed to this shaft through the medium of a separate hub I26 having a flange l 21 fastened by screws to the disk, see Fig. 6. This hub I28 is secured to the'shaft 2 in any suitable manner and is here shown by a set screw 3. On shait 2 there is a collar 4 over which the central aperture of disk D is mounted. The tubular shaft 2 is supported within a tubular post 5. On top of this post I there is a spacer collar 8 which different thicknesses for t its lower end with a lug I which is fastened by a bolt I .to a block I forms the general base of thet'iri'achine. On the inside of the shaft 2 there is a shaft I! which is connected to revolve with shaft- 2 by means of a pin l3 fixed in shaft l2 and with its end extending into an aperture l4 in shaftif. On the bottom shaft If there is loosely mounted a small gear I! g as an idler on shaft l2 and small collar I! on the screw cap it by suitable When cap Ii is scl ewdl fiowh tightly-?it lifts shaft ll, thus drawing the gear ilupfighfly to the end of shaft f iini'frictional-i'contact the gear II to rotate with the shaft 2 actuated by turn table T "on the table by the fixed on a cross bar It on the baseboard II which memes I provide that the wheel 35 be adjusted to the pinion It to take up wear of those friction surfaces without having to renew the parts.

A suitable electric motor for driving the aforesaid gearing is indicated by 4. which is mounted in a suitable motor frame 3| by means of self aligning bearings 4|.

The motor frame 3| is provided with stud projections 31 on the inside of the frame and over which there are tubular rubber bushings 31a on which are mounted bearings 42 of a rocker frame carriage member 45 which is shown in plan in Fig. 1b. The bearings 42 are on studs 44 on carriage 45 and these studs have bearing seats 43 in which are carried the rubber bushings 310, which are to prevent the transmission of vibratory motion to the frame of the machine and also acts as a rotatable cushion permitting a small amount of up and down movement of distances being uniform rate of travel speed of the-stylus on'the' record sound groove, the gear It is clamped tightly by the screw cap it to revolve a ums with the turn table T. The gear shaft lf with its gear ll drives a horizontal transversescrew threaded shaft II by any suitable means which is here shown as beingcomposedbyagear I! which is mounted on a short vertical shaft 20 on which there is also mounted swarm -gear 2| which engages and drives a gear Hon the aforementioned threaded shaft -l8.*'"'1h'e vertical shaft 2. is mounted at its bottom end in a bearing in or on the cross a 'I'hetopofshaft 20 is supported by a bracket, 23 The threaded shaft is mounted at. itsends'in bearings on

posts

24 and 25.

The turn table T is revolved by a friction wheel 28 which" iitactsjhe under side of the table 21.*Thiswheel 28"is provided on its outside with along hub is, see Fig. 1, mounted to revolve; V I 3!; [On the insidejoflfriction wheel ll there is fixed onits inside hub agear II, see Fig. 3, which revolves with wheel, 28. An idle-gear 32 is "studsliaft2! fixed in a motor frame m stache a stud fixed to the motor frame a 3i and is engaged by, a gear ll which in turn nsasesa. pinion I! mounted on a shaft 34 also fixed intojth "motor frame ll. Pinion 33 is thehub of a friction wheel 35 and 'revolves w til it on a; shaft :4, see Figs. 1, 2 and 2d, andf engaged and driven by a friction pinion vflljonfans'electric motor shaft :9. m

drive wheel 28 and connected motor frame work. thereby absorbing any small variation in the plane of rotation 01' the turn table. This feature of self adjustment by the rubber tube bushings is highly important in accommodating the revolving parts to automatically balance to their own centers and thereby preventing vibrations of the parts.

The motor frame 3| carries as a unit the aforementioned gear driving train which drives the friction wheel 28 which drives by frictional contact the under surface 21 of turn table T.

A spring 48 connected at the top of motor frame 3| and extending down and connected to rocker frame carriage 45 holds the friction wheel I always in elastic contact with the bottom surface 21 of turn table T by a rocking motion of motor frame 3| about the bearings 42 on the studs 44' of rocker frame carriage 45.

This carriage 45 is mounted at 41 to rock and slide along a transverse shaft 48 which is supported by angle blocks 48 on the base ll of the machine. The carriage 45 is provided with an extension end 54 broken away in Fig. 1 and integral in Fig. 2. On this end-50 there is fixed a pin II on which is mounted a spring 52, see Fig. 2, which spring is connected by an arm II fixed on a cross bar. This bar 54 is mounted to reel and slide along a shaft 55 fixed at its ends by angle brackets 56 which are mounted on a cross block 51 on the base board II.

The rocking, tilting and transverse movement of rocker frame carriage 45 on shaft 48 acts also to rock and move transversely the cross bar 84 on its supporting shaft 55 through the medium of spring If and arm I3.

On cross bar I4 there is fixed the upright tubular post I over which there is mounted a tubular post if a set screw 82 on post I! clamps it against rotation or allows it to rotate as desired. The

post It carries the tubular arm .4 ,on which stylus head I is mounted.

The weight of the front end of carriage 4! together with the weight of the motor 40 located on this end of the carriage 48 which are on the front side of shaft shown on the left side of there is fixed a counterbalancing spring 84, see Fig. 7. This spring 84 in service contacts a cross rod 85, being a part of a crank shaft 8|. to counterbalance inpart the weight of the weight of the arm 88 and stylus head 8| from pressing down on the sound grooves of the records. This The rocking motion of carriage 45 on shaft 48 is produced through the mechanism of aroller 88 on a pin 88 fixed into the carriage frame 48 together-with a fiat bar 18 on which the roller 88 is always in contact, which contact is produced by the weight of this end of the carriage 48 and the weight thereon of the motor 48 and its frame 8|. These always keep the roller 88 in contact with the fiat bar 18.

While the roller 88 is a desirable construction,

depending somewhat, as relates to the roller alone in relation to the load on these parts, as whenthe load is light it may be carried by the pin 88 alone or by a suitable substitute for the pin in the form of a projection on the end'portion of the carriage 45 or the end of the carriage itself.

The fiat bar 18 is mounted at its ends in trun nions II at the left and 12 on the right; For the purposes herein shown I prefer to use the fiat bar I8 mentioned; which is'of simple construction and is intended tomean wherever used herein,- to cover' equivalent constructions of ec-,

centric form. These trunnions are mounted in angle brackets 18 fixed to the frame base II. On trunnion 12 there is mounted a gear 14 which meshes with a gear 15 mounted on an upright shaft I8, on top of which there is a hand hold knob 11.

By turning knob 11 in either direction the fiat bar 18 may be made to revolve ninety degrees from the fiat position shown in Figs. 1, 2 and 4 to an upright, vertical position shown in Figs.

14 and 15 which then raises roller 88 from po-.

sition of full lines to the dotted position shown in Fig. 4.

The fiat position of bar 18 in Figs. 1, 2, 4 and 8 is that in which the half nut 81 is free from contact with threaded shaft l8. In this position mounted and carrying a small gear 88 which en gages a larger gear 8| mounted on the vertical portion of a crank arm 82, see Fig. 1, which is connected to a link 83 on apin 84 on the carriage member 45, whereby the knob 18 will move carriage laterally and carry withit the motor drive 48 which revolves the turn table T and also the bar 54 on which the stylus arm post 58 is mounted.

The lateral movement of carriage 45 produced by the revolution of the threaded shaft I8 is the situation when the machine is used to record and play back the sound groove of equal units of length.

When common or constant rotational speed records are played then the carriage 45 is locked against lateral movement as previously described.

The vertical shaft 18 and crank arm 82 are supported to base II by the plate 85 supported on a block secured to the'plate 81 on base H, see Fig. 4.

The vertical shaft 18 is mounted at its bottom in bearing I28 fixed to base H, see Fig. 4 and Fig. 15. At the upper ends the vertical shafts "l8 and 18 are supported in any suitable manner and here are shown as supported in a cross beam |28 suitably fixed to the enclosure box in which the machine'is mounted for service. This box is not shown in these drawings.

On trunnion ll of fiat bar 18 there is mounted a crank arm 88 to which is attached a rod 88. On the other end of rod 88 it is connected to a crank arm 88 mounted on a crank shaft 8|.

This shaft has an offset rod portion 85 and is mounted lnbrackets 82 on the base l the inside edge of fiat bar 18 is revolved to bethe carriage is free to slide laterally or cross-- wise of the machine along the shaft 48.

When fiat bar I8 is set on edge, see Figs. 14 and 15, then the half nut 81 contacts the threaded shaft l8. This results in locking carriage 45 to be moved laterallyor crosswise only by the revolving of. shaft l8. This lateral or crosswise movement of 45' by shaft I8 is produced only when the cap nut I8 is screwed down as previously described when gear I5 is clamped to re-- valve with shaft l2 and it by the revolving of turn table T. e

, When-gear l! is not clamped to shaft l2 then the half nut 81 locks the carriage 45 from lateral come the top of the bar in contact with the roller 88. This movement swings crank arm 88 to push rod 88 to swing arm 88 to revolve the shaft 8| as indicated in Figs. 5, 7, 14. and 15. This brings the rod portion of shaft 8| to contact the spring 54 and thereby act as a counterbalance as before mentioned. When knob 11 is revolved clockwise it causes the flat bar 18 to move its front edge to the top in contact with roller 88 and causes'a reverse movementof shaft 8| by a right swing of the arms 88 and rod 88. This movement of shaft 8| causes the rod portion 85 to fall away downward in relation to counterbalancing spring 84 to relieve its pressure in counterbalancing of stylus arm 88 and head 8| to allow the stylus more weight to act in recording contact witha record on turn table T.

An electrical switch 83 of any suitable construction is provided, seeFigs. 1 and 5, having a central pin or axis 84 about which contact

arms

85 and 88 are mounted and switch shifting the electrical current flow as indicated by the diagram in Fig. 1a; in which these contact arms are'shown closing the electric circuit C, thus putting a microphone in service to actuate the recording stylus to make a recording soun'd. When the

arms

85 and 88 are switched over to

contacts

88 and 81 this puts in service the circult E which then becomes the electric circuit from the reproducing stylus head to the loud speaker.

While the electric switch may be of any suitportion 85. This shaft 8| when moved by the counterclockwisemov'ement of knob IT-actuends of a horse shoe magnet I2I.

block I22 of nonmagnetic metal is mounted onthe motor frame 3| to contact a friction arm.

I04 on the motor frame 3|. Lead wires I00 extend from the motor 00 to a suitable electric power supply.

The stylus head 0|, see Figs. to 13 inclusive, is provided with a stylus point I00 mounted in a radius block I01, and secured therein by a set screw I08. The radius block I0! is fixed to a stylus shaft I00 which is carried in bearings H0 and III. These bearings are split on one side through which there passes the clamping screws II2. This provides means for holding the shaft in these hearings preventing chatter of the shaft. At the right end of shaft I00 there is fixed a flat link H3 which is secured at its right end to a block Ill. Thus there is prevented endwise movement of shaft I00. 0n stylus shaft I00 there is fixed a cross vibrator armature block II 0 having its ends extending through the central regions of magnet coils H0 and II! located over the stylus shaft I00 and around which coils there are mounted magnetblocks having vertical portions I I0 and transverse top .and bottom ends I10 extending over at the top and bottom of the coils.

Screw bolts I fasten these magnet blocks to the bottom of the housing enclosure of the head.

The magnet blocks IIO are connected by the A transverse the top of the magnet blocks and coils by the screw bolts I20. This transverse block I22 is slotted across its'width in which slot there extends the upper end of vibrator block Ill. The

upper end of block H0 is connected on each side by rubber tip ends of adjusting screws I20. These screws provide accurate means for conthrough the tubular post 00' and to the switch '00,

for service in relation to the electrical actions involved with the stylus I00. A suflicient amount of slack conductor wire extends from the bottom of post 00 over to the switch 00 to allow for the transverse movement of the stylus across the machine. Suitable wires I20 extend from motor 00 tocarry the electric current thereto.

A very important featureof my invention is the fact, that while sound recording and reproduction of a very high quality can be produced by the machine herein described, a very high degree of efficiency at a very low cost is also easily obtainable. resulting in a most inviting sales position.

A special feature of low cost and high efficiency is the mounting of the turn table T on a separate hub I20 having'the flange I21 suitably fixed to the shaft 2. This is performed by providing the shaft 2 as a unit, then applying and securing to the shaft by any suitable means, a hub m hav-' a ing a flange I21, then turning for facing this flange, while fixed to the shaft, to accurate relationship with the shaft. When this is done and the disk turn table T is truly machined it is then mounted on the flange I2I.by any suitable means and is here shown fixed by screws. This construction obviates slight variations that are impossible to-avoid in fitting shafts to hubs of turn tables T in place of hubs which are an integral part of the turn tables. Even slight variations in these parts result in obiectional vibrations in service of this type of machinery.

' The rubber bushings 01a on which the motor frame 0| is mounted in bearings 42 of the carriage 40, are a low cost feature of construction and are of great value in reducing vibration in the operation of a machine of this service. This provides, as it were, means for the parts to automatically adjust their own centers of activity wherein there is the least vibration in the operations involved.

Other inventions in relation to low cost constructions are involved in the base frame member The fiat board base or other and its mountings. low cost fiat base II with its bracket and stud mountings of the operative parts is a highly valuable construction of low cost in a machine of this class.

My vibrating armature block H0 on stylus shaft I09 is provided with electrical coils H0 and III through which the ends of armature block IIO enter and extend through the central region of these coils. The stylus shaft I00 on which armature block III is mounted passes between the coils. This arrangement provides a balancing effect on each'side of the stylus shaft I00 which is a great desideratum in the operation of the armature block 0. The resilient tips of screws I20 substantially dampen the vibration in contacting the armature block H0, and by limiting the movement of the armature block ends the result is obtained, as it were, to help overcome the inertia of the return stroke or' return vibration inthe opposite direction. I compare the feature of saving inertia loss to what occurs in handling a hammer successively when pounding on anything that results in a rebound of the hammer at once after the contact. The old saying being.-catch your hammer on the up stroke with the rebound. thus conserving the inertia of the movement. However quickly the armature block may respond to the magnetic impulses there is inert .a from the reverse movement and these resilient tip contacts are the most efficient and least objectionable of any feature. of this kind I have yet discovered. a

The special arrangement of coils H0 and III in arrangement with the magnets as shown is highly efficient and of low cost construction.

The adjustable bearings I I0 for the stylus shaft I00 allows the stylus shaft I00 to vibrate but not chatter in these bearings which is. a great desid speeddiskreoords may be cut or' played back.

. that of the variable speed may be brought about by turning a single knob being that of the screw cap l5. 2 2

When the screw cap-I5 is not clamped down on the disk of the turntable then the motor driving unit is adapted to drive and revolve the table at a constant rate of speed. When the screw cap is screwed down tightly clamping the disk record onto the table then the driving mechanisms for the table will revolve it at a variable speed. In either case the revolution of the table by the motor driving unit takes place only when it contacts the underside of the table and this is always the case when the front end of the rocking carriage in which the motor driving unit is carried is held upwardly by having its front end supported on either edge of the fiat transverse bar 10. The movement of this bar from edge position and vice versa is brought about by revolving knob 11 in either direction. when the knob 11 is revolved to revolve the flat bar ID to flat position this is required only at intervals of time when the motor drive is free from driving the turntable and the half nut 67 is also free from the screw threaded shaft l8.

In this situation the front end of the carriage 45 is in its lower position and'thus the friction contact of the motor drive with theturntabie is free from the turntable. Further when the front end of the carriage 45 is in its lower position supported on the flat side of the bar I0 its outer end 50 of the carriage 45 is lifted upwardly and this movement rocks upward the cross bar 54 on which the stylus head is supported and thereby lifts the stylus from the record. Thus the lower position of the front end of the carriage 45 is the situation for the exchange of records on the turntable as then the turntable is at rest and is also the situation for the adjustment of the stylus at any point on the record. Further this is the situation whenthe carriage 45 is manually moved transversely to return the'carriage with its motor drive when the machine is used for variable speed driving of the turntable.-

This manual operation may be made directly by the hand contacting the carriage 45 but a knob 14 is provided on a shaft 19 which is-geared to move a crank arm 82 connected by a link 83 to the carriage 45 and thus by revolving theknob ll the said carriage 45 and its connected parts may be adjusted to any position desired.

Thus the machine may be adjusted as desired for any of its uses by revolving the three knobs being the screw cap it, knobs l1 and 18. Thus instructions for adjusting the machine need necessarily extend only beyond imparting the information as to how to turn the aforesaid three knobs.

As to the knob 11 which is geared to revolve the flat bar 1.0 in either direction of, the revolution of said knob 90 degrees thus bringing either edge of said flat bar to the upward position which position not only produces the contact of the motor. driving'unit to revolve the turntable but is connected to mechanism extending back to the rear of the machine which raises and lowers the stylus head and also switches the electric current from situations involved at one time in cutting a record and at other times in playing back a record the latter situations are controlled in the switching operations by the direction or the revolution ofthe knob II as described and shown in the specification and drawings.

Thus. it is clearly shown that whatever use is made of the machine a knowledge required for operating it is required only as to an understanding of how to revolve the aforesaid three knobs.

This is a great. desideratum particularly-so in relation to the use of the machine by blind persons and many others.

The above described knobs are located in the case of the machine above the main mechanisms thereof which permits coverage above these mechanisms leaving only the knobs. the turntable and the stylus head and its mountings about the coverage of the lower mech of the machine.

In addition to the above described operative advantages of the machine the mechanical constructions generally involved in this machine provide accuracy of movement and freedom from injurious vibrating features which are serious interferences in the performances of a machine of this class. The mountings of the motor driving unit having the elastic trunnion connection which allow as it were a self centering action of the revolutions of the'electric motor aid in providing a smooth operation and thereby prevent vibrations which might injure the recording and play back sound productions. I 1

What I claim is:

1. In a machine of the class described, a turntable on which a record body is mounted, a motor driving unit contacting the under side of the turntable in driving the same, a friction wheel mounted in the said driving unit for contacting the said turntable, a rocking carriage on which said driving unit is mounted, trunnions in the said driving unit, hearings in the 'said carriage said carriage is mounted, the mounting of said carriage on said transverse shaft being located near the middle length of the said carriage and in form to rock on the said shaft and to slide lengthwise on the said shaft, a base frame member on which the said, transverse shaft is mounted, a transverse screw threaded shaft mounted parallel with the said transverse shaft and. supported on the said base member and losince one of the trunnions of the said flat bar cated below the said carriage and between the front end of-said carriage and the transverse shaft on which the said carriage is mounted, a threaded half nut mounted on said carriage. in position to contact the said threaded shaft as and when the front end of said carriage is rocked upwardly, the said turntable on its underside being provided with a vertical supporting shaft, supported in bearings on the base member of the machine, this shaft of the said turntable connected by gearing to the said transverse screw shaft whereby the latter may be revolved by the rotation of the said turntable, said gearing adapted to be connected and disconnected in relation to driving the said transverse screw threaded shaft whereby the latter may be revoived by the, rotation of the said turntable, said gearing adapted to be connected and disconnected in relation to driving the said transverse screw shaft by the revolution of the said tumtable, a transverse bar of eccentric form located in the front region of the said rocking carriage, trunnions on the said bar being supported by bearings on the said base frame, means for revolving the said bar from a vertical raised position to a lower position in relation to the said base member, a roller mounted on the front end of the said carriage and contacting the said bar, the position of the said half nut which contacts the said transverse threaded shaft being located on the said rocking carriage whereby the front end of the said rocking carriage is supported upwardly on the edge of said bar through the means of the said roller the said half nut contacts the said transverse threaded shaft, when the front end of said rocking carriage is lowered to a position where the said roller contacts the said side of said bar then the said half nut is free of the said threaded shaft.

2. In a machine of the class described. a tumtable on which the record body is mounted, a motor driving unit adapted to contact the underside of the turntable in driving the same, this motor unit adapted to rock slightly in relation to its position to the said rocking carriage, a spring connection from the said motor unit to the said rocking carriage adapted to hold the said motor unit in elastic rocking position as relates to motion on its trunnions supports in the said rocking carriage, a transverse supporting shaft mounted across the base member of the machine, bearings on the said rocking carriage located approximately at the middle length of the said carriage, said bearings mounted on the said transverse shaft and adapted to rock thereon and slide along the said shaft, a transverse screw threaded shaft supported in bearings from the base member of the machine and located parallel with the aforementioned transverse shaft and this location being on the side toward the front end of the said rocking carriage as relates to the said transverse supporting shaft, a threaded half nut mounted on said rocking carriage and located beneath the position of the said transverse screw threaded shaft and adapted to contact the said threaded shaft as the front end of the, said rocking carriage is rocked upwardly, the said turntable provided with a vertical supporting shaft beneath the table and supported in bearings on the base member of the machine,'gearing adapted to connect between the said vertical shaft of the said turntable and the said trans-' verse screw threaded shaft, said gearing adapted to be connected and disconnected in 'rela tion'"to.

across and in'association withv the front end of the said rocking carriage and adapted to contact the front endof the said rocking carriage .and

of said rocking carriage adapted to rest'on the flat'surface and on the edge of the said flat bar, means adapted to revolve the said bar from a flat position to a vertical edgewise position and thereby to raise and lower the front end of said rocking carriage to'rock about its support on the said transverse supporting shaft and thereby raise and lower the said motor driving unit to contact the underside and revolve the said tumtable and to raise and lower the said half nut to contact and be free from the said transverse' threaded shaft; in combination with means for revolving the said flat bar on its trunnions.

3. In a machine of the class described, a turntable on which the record body is mounted, a motor driving unit adapted to contact the underside of the turntable in driving the same, this motor unit provided with a friction wheel for contacting the turntable, a rocking carriage on which the said motor driving unit is mounted,

the said motor driving unit being supported in the said rocking carriage by means of trunnions in bearings in the said rocking carriage, the location of these trunnions and bearings in the said carriage being at the frontend of the said carriage, the said motor unit adapted to rock slightly in relation to its position to. the said rocking carriage, a spring connection from the said motor unit to the said rocking carriage adapted to hold the said motor unit in elastic rocking position as relates to motion on its trunnions, supports in the said rocking carriage, a transverse supporting shaft mounted acrossthe base member of the machine, bearings on the said rocking carriage located approximately at the middle length of the said carriage, said bearings mounted on the said transverse shaft and adapted to rock thereon and slide along the said shaft, a transverse screwthreaded shaft supported in bearings from the base member of the machine and located parallel with the aforementioned transverse shaft and this location being on the side toward the front end of the said rocking carriage as relates to the said transverse supporting shaft, a threaded half nut mounted on said rocking carriage and located beneath the connected in relation to the rotation of the said screw threaded shaft by the. revolution of the said turntable, a transverse flat bar provided with trunnions on its end, bearings supporting the said trunnions on the base member of the machine and this flat bar located at thev front end I of the machine and across and in association raise and lower the same by means. of a portion with the front end of said rocking carriage and adapted to contact the front end of said rocking I carriage and raise and lower the same by means of a portion of said rocking carriage adapted to.

rest on the flat surface and on the edge of the said flat bar, means adapted to revolve the said bar from a flat position to a vertical edgewise position and thereby to raise and lower the front end of said rocking carriage to rock about its support on the said transverse supporting shaft and thereby raise and lower the said motordriving unit to contact the under side and revolve the said turntable and to raise. and lower the said half nut to contact and be free from the said transverse threaded shaft, with means for revolving the said flat bar on its trunnions; in combination with a stylus head and means for supporting the same over a record position on the said turntable.

4. In a machine of the class described, a turntable on which is mounted a sound record body, a power unit adapted to revolve said tumtable, a rocking carriage on which said power unit is mounted, said rocking carriage mounted on a transverse shaft supported on the base member of the machine, said rocking carriage adapted to rock on the said shaft and slide along thereon, said power unit mounted on the front end of said rocking carriage, a transverse flat bar supported in trunnions on the base, member of the machine and across in front of the front end of the said rocking carriage and this end of the said carriage supported by the said flat bar, a transverse screw threaded shaft mounted across the base member of the machine in parallel relation to the said transverse shaft, means for revolving the screw threaded shaft by a revolving movement of the said turntable, this means adapted to be connected and disconnected in relation to revolving the said screw threaded shaft, a half nut connected to the said rocking carriage in position to engage the said transverse screw shaft and be actuated thereby to move the said rocking carriage when the front end of the said carriage is in its upward position and be disconnected from the said screw threaded shaft when the said front end of said carriage is in its lower position, means for revolving the said flat transverse bar from a flat position whereat it supports the front end of said carriage at its lower position whereat the said half nut is free from the said screw shaft, to its edge position whereat the front end of said carriage is in its upward position at which the said half nut is contacted by the said screw threaded shaft.

5. In a machine .of the class described, .a turntable on which is mounted a sound record body, a power unit adapted to revolve said turntable, a rocking carriage on which said power unit is mounted, said rocking carriage mounted on a transverse shaft supported on the base member of' the machine, said rocking carriage adaptedto rock on the said shaft and slide along thereon, said power: unit-mounted on the front transverse bar from a flat position whereat it supports the front end of said carriage at its lower position whereat the said half nut is free from the said screw shaft, to its edgewise position whereat the front end of saidcarriage is in its upward position at which the said half nut is contacted by the said screw shaft, gearing con- 'nected to one of the said trunnions of the said a rocking carriage on which said power unit is mounted, said rocking carriage mounted on a transverse shaft supported on the base member of the machine, said rocking carriage adapted to rock on the said shaft and slide transversely along thereon, said power unit mounted on the front end of said rocking carriage, -a transverse flat bar supported in trunnions on the base member' of the machine and across in front of the front end of the said rocking carriage supported by the said flat bar, a transverse screw threaded shaft mounted across the base member of the machine in parallel relation to the said transverse shaft, means for revolving the screw threaded shaft by a revolving movement of said turntable, this means adapted to be connected and disconnected in relation to revolving the said screw threaded shaft, 9. half nut connected to the said rocking carriage in position to engage the said transverse screw shaft and be actuated thereby to move the said rocking carriage when the front end of the said carriage is in its upward position and be disconnected from the said screw threaded shaft when the said front end ofsaid carriage is in its lower position, means for revolving the said fiat transverse bar from a flat position whereat it supports the front end of said carriage at its lower position whereat the end of said rocking carriage, a transverse flat bar supported by trunnions on the base member of the'machine and across and in front of the front end of the said rocking carriage and this end of the said carriagesupported by the said flat bar, a transverse screw threaded shaft mounted across the-base member of the machine in relation to revolving the said screw threaded shaft, a'half nut connected to the said rocking carriage in position to engage the said transverse screw shaft and be actuated thereby to move the said half nut is free from the said screw shaft to its edge position whereat the front end of said carriage is in its upward position at which said half nut is contacted by the said screw shaft, gearing connected to one of the said tnmnions of the said flat bar whereby the said bar maybe revolved from flat to vertical positions; in combination with a rear transverse shaft mounted across the rear of the base frame member, a

rocking sliding block on said rear transverse counterbalancing spring, a crank arm on said crank rod, said arm connected by a connecting said rocking carriage when the front end of the said carriage is in its upward position and be disconnected from the said screw threaded shaft when the said front end of said carriage is in its turntable.

lower position, a means for revolving the said flat .rod to a crank lever fixed on one of the trunnion crank rod upward or, downward in contact with the said counterbalancing spring thus becoming a counterbalance in relation to the support of the said stylus head over. a record body on said EDWARD ROBERT