US2270972A - Recording and reproducing phonograph - Google Patents

Description

E. v. SCHNEIDER 2,270,972

I RECORDING AND REPRODUGING E HONOG RAPH 2 sheds-sheet 1 Filed Sept. 11, 1940 v through the pick up arm;

' line 6-4. Fig.2.

Patented Jan. 27, 1942 nncoan'me Arm nsrnonucmc rnonocmirn Emmor v. Schneider; Alliance, Ohio, assignor to Alliance Manufacturing Company, Ohio, a corporation of Ohio Application September 11, 1940, Serial No. 356,313

Claims.

The invention relates to phonographs and more particularly to a phonograph having a combination recording and play-back arm.

There is at present a considerable demand for combination recording and play-back phonographs for home use as a large number of people have become interested in making their own records and playing the same as well as playing the usual commercial records.

This demand has produced considerable business in themanufacture of combination instrumerits provided with one arm for carrying the cutting or recording needle with suitable tension and screw feeding means thereon for properly spacing the grooves and sound track and a second .arm for carrying the play-back needle by means of which the sound from the phonograph records may be reproduced.

The object of the present improvement is to provide a phonograph having a single arm adapted to carry either a substantially vertical recording needle or an inclined play-back needle and having a novel screw feeding and tension means for properly spacing the grooves or sound track when used .for recording and means for releasing the same when the arm is to be used to playback the records.

Another object is to provide a novel friction drive for moving the arm when recording.

A still further object is the provision of an improved spring hinge device for mounting the the improved phonograph in the manner illus-- trated in the accompanying drawings in which Figure 1 is a bottom plan view of the improved I phonograph mechanism;

Fig. 2, a longitudinal sectional view through the same taken on the line- 2-2, Figure 1';

Fig. 3, an enlarged longitudinal sectional view Fig. 4, an enlarged fragmentary elevation of the improved spring hinge means for the pick up arm:

Fig. 5,- a bottom plan view of the same; and

Fig. 6, a fragmentary sectional view of' the friction drive means for the pick up arm and the releasing mechanism therefor taken on the Similar numerals refer to similar parts throughout the several views. I I

The platform of a phonograph cabinet is indicated generally at In and the spindle ii for the turntable i2 is journaled through said platform and mounted in a suitable bearing bracket l3 connected to the under side of the platform as by screws l4.

As in usual practice the turntable may have the depending peripheral flange IS the inner side of which is engaged by the friction tire i6 upon the wheel I! which may be journaled upon a post l8 mounted upon the slidable plate iii.

The friction tire l6 upon the wheel li also engages the pulley upon the upper end of the shaft 2| of' a motor 22 by means of which the wheel I! is driven by the motor and in turn drives theturntable at the desired speed.

.The motor may be suspended as by the rods 23 .from a base plate 24 .secured to the under side of the platform it) as by the rubber grommets 25.

The slidable plate 19 carrying the post i8 for the wheel I? is slidably mounted upon the upper side of the base plate 24 and operates within an opening 26 in the platform I0.

The motor mounting itself forms no part of the present invention and no further explanation thereof is thought necessary.

-The low portion of the turntable spindle II has a worm screw 21 thereon meshing with the worm wheel 28 mounted upon a shaft 29 journaled transversely through the bearing bracket IS, the outer end of said shaft forming a friction pulley-30. r

The pick uparm indicated generally at 3| is mounted in a manner to be later described upon the shaft 32 journaled in a bearing 33 fixed upon the platform I. i

The shaft 32 extends some distance below the platform and has fixed thereto the hub 34 of a rocker arm 35 upon the free end of which is formed an'arcuate segment preferably having a strip of rubber or other friction material 31 attached thereto for contact with the friction One end of the segment 36 is turned down as at 38 forming a-stopfor' contact with the pulley 30 to limit movement of the arm in one direction. The other end of the segment is turned down at ll to limit movement of the arm in that direction and a cut out 40 is provided in the periphery of the segment for a purpose to be later described.

In order to cooperate with the friction roller 30 to frlctionally drive the segment of the rocker arm 35 in orderto move the pick up arm 3| across the face of the record, when cutting or recording, a roller 4| is provided to bear against the opposite side of the segment 36 from that contacting the friction roller 30; so as to hold the friction surface 31 of the segment in contact with the friction roller 30.

This roller 4| is loosely joumaled upon a spindle 42 carried by one arm 43 of a bell, crank lever pivoted as at 44 upon the bearing bracket iii, the other arm 45 of the bell crank lever having a spring 46 connected thereto and to a stationary portion of the device, such as the bearing bracket it in order to normally hold the roller 4i upon the segment 38 and force the same into frictional contact with the friction roller so.

. For the purpose of releasing the friction con tact upon the segment 36 when it is desired to play back a record a link 61 is pivoted at one end to the free end of the bell crank arm 45, as

.indicamd at 48, the other end of said link being pivoted as at 48 to the free end of the arm 50 of a bell crank pivoted as at El upon the platform iii.

The other arm 52 of this bell crank has a link 53 pivoted to its free end as at 54, the other end of the link 53 being pivoted as at 55 to a lever 56 pivoted as at 51 having an off set portion located through an arcuate slot 58.

By throwing the lever 56 from the full line positien toflhe broken line position shown in Fig. l, the link 53 is thrown over the center 51.

and through the linkage and leverage above described, the roller is raised from contact with the segment 36 and held in this position.

Another feature of the invention is the manner in which the reproducer i9 is mounted upon I the pick up arm 3!.

' against opposite sides of the flexible'strip ill at a pointspaced from the adjacent end of the reproducer.

The flexible strip 60 and clamp plates 62 are connected at their other ends to the depending" posts 64, in the pick up arm, as by screws 65.

a play back needle 11 when the device is being used to play back a record.

The usual set screws 1! are provided for clamping the needles in the sockets and for this purpose vertical slots 19 are formed inthe depending end wall 80 of the pick up arm to permit the required vertical movement of the reproducer upon its hinge.

For the purpose of mounting the pick up arm upon the oscillating post 32 a channel shaped bracket 83 is fixed upon the upper end of the post 32 and provided at its outer end with notches 84 to receive the headed studs 88 upon the depending side walls 88 of the pick up arm.

A pull spring 81 is connected at one end to a stud 88 at the upper rear end of the pick up arm and at its other end to a stud II on the bottom of the channel bracket 83 at the forward or inner end thereof.

An adjustable stop screw it depends from the pick up arm and is arranged to contact the ear 9! at-the forward or inner end of the channel bracket 83 when the pick up arm is in operative position. 1

When it is desired to raise the pick up arm from the record it is swung upwardly upon the pivot points 85 to the broken line positionshown in Fig. 3, the spring 81 throwing over center and holding the pick up arm in raised position until it lever 66 is thrown to the full line position shown With this construction the flexible strip will hinge at the point where the knife edges 63 contact the same and as the clamping plates 62 are outwardly curved adjacent to the knife edge portions, as shown at 66, the'flexible strip will have freedom of movement between the same as the strip'is flexed.

A pull spring 61 is connected at one end to an ear I at the hinged end of the reproducer, the

other end of said springbeing connected to a nut 8! upon an adjusting screw "located through the depending wall 1| of the recessed portion 12 'in the pick up arm.

with this construction the tension upon the spring 61 may beadjusted as desiredin Fig. 1 permitting the spring 46 to hold the roller 41 tightly against the upper surface of the segment 36 forcing the friction surface 31 thereof into frictional contact'with the friction roller 30. A blank record to be cut is placed upon the turntable l2, the motor 22 is started and the pick up arm lowered upon the record near the periphery thereof.

The turntable will be rotated at proper speed through the. friction drive from the motor and through the worm and gear drive from the tumtable spindle, the friction roller II will be driven at proper speed to frictionally drive the arm 35 moving the pick up arm at the desired speed to properly form the sound track upon the record.

As the pick up arm moves to the center of the record the roller 4| will drop into the notch 40 preventing further movement of the pick up arm.

When it is desired to use the device for play back of a record, the lever 50 is thrown to the broken line position shown in Fig. 1 raising the roller 4| out of contact with the segment 36 so that 'thepick up arm is free to move as the reproducing or play back needle 11 rides through v the sound track of the record.

cluding a friction pulley. searing connecting the The usual flexible electric cord 18 leads to the reproducer 59.

The reproducer I! is readily a combination reproducer and recorder and for this purpose is provided with a substantially vertical socket 14 pressing the other side thereof into frictional contact with the friction pulley for moving the pick up arm'at the proper speed to cut a sound track upon a record on the turntable, and means a for releasing said pressure means so that the pick up arm may swing freely upon its vertical pivot.

2. A,phonograph including a turntable, a pick up arm oscillatably'mounted at its rear end on a vertical pivot for movement across the turntable,

and feed mechanism located immediately beneath the turntable, said feed'mechanism including a friction pulley, gearing connecting the turntable and friction pulley for rotating the I pulley, a segment extending rearwardly from and moved by said friction pulley, the-rear end ofsaid segment being rigidly connected to'the vertical pivot of the arm for simultaneous horizontal movement with the arm, pressure means for bearing against one side of the segment and pressing the other side thereof into frictional contact with the friction pulley for moving the pick up arm at the proper speed to, cut a sound track upon a record on the turntable, and means for releasing said pressure means so that the pick up arm may swing freely upon its vertical pivot, and a horizontal pivot connecting the pick up arm to the vertical pivot so that the pick up arm may be raised and lowered independently of the segment.

3. A phonograph including a turntable, a pick up arm oscillatably mounted at its rear end on a vertical pivot for movement across the turntable,

and feed mechanism locatedimmediately beneath the turntable, said-feed mechanism including a friction pulley, gearing connecting the turntable and friction pulley for rotating the pu moved by said friction pulley,the rear end of said segment being rigidly connected to the vertical pivot of the arm for simultaneous horizontal movement. with the arm,- a pressure roller for hearing against one side of. the segment and preming the other side thereof into 'frictional contact with the friction pulley for moving'the pick up arm at the proper speed to cut a sound track upon a record on the turntable, and means for releasing said pressure roller so that the pick up arm may swing freely upon its vertical pivot.

4. A' phonograph including a turntable, a pick a segment extending rearwardly from and up arm oscillatably mounted at its rear end on a vertical pivot for movement across the turna table, and feed mechanism located immediately beneath the turntable, said feed mechanism including a friction pulley, gearing connecting the tumtable'and friction pulley for rotating the pulley, a segment extending rearwardly from and moved by the friction pulley, the rear end of said segment being rigidly connected to the vertical pivot of the arm for simultaneous horizontal movement with the arm, a lever pivoted adjacent to the segment, .a roller upon the lever, spring means associated with the lever for pressing the roller against the segment'and holding the segment in frictional contact with the friction pulley .for moving the pick up arm at the proper speed- Y to cut a sound track on a record on the turntable, and means operatively associated with the lever for moving the roller away from the se ment so that the pick up armv may swing freely upon its vertical pivot. a

5. A phonograph including a turntable, a pick -up arm oscillatably mounted at its rear end on a vertical pivot for movement across "the turntable, and feed mechanism located immediately beneath the turntable, said feed mechanism including a friction pulley, gearing connecting the turntable and friction pulley for rotating the pulley, a segment extending rearwardly from and.

'moved by the friction pulley, the rear end of said segment being rigidly connected to the vertical pivot of the arm for movement with the arm, a lever pivoted adjacent to the segment, a roller upon the lever, spring means associated with the lever for pressing the roller against the segment and holding the segment in frictional contact with the friction pulley for moving the pick up arm at the proper speed to cut a sound track ona record on the turntable,

and means operatively associated with the lever-- for moving the roller away from the segment so that the pick up arm may swing freely uponitsvertical pivot, and a horizontal pivot connecting the pick up arm to the vertical pivot so that the pick up arm may be raised and lowered inde-' pendently of the segment.

simultaneous horizontal on v. scmmman.

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