US1304404A - Alfred j - Google Patents

Description

A. .l. swme. TALKING MACHINE. APPUCATION FILED JULY 28. l91G- Patented May 20, I919.

ALFRED J. SWING, OE CINCINNATI, OHIO.

TALKING-MACHIN E.

Specification of Letters Patent.

Patented May 20, 1919.

Application filed July 2a, 1916. Serial No. 111,932.

of Ohio, have invented certain new and. usetalking machines.

ful Improvements in Talking-Machines, of which the following is a specification.

My invention relates to improvements in One of its objects is to provide improved tone arm and reproducing apparatus to adjust the reproducing apparatus into and out of .operative relation with the record. Anotherobject is to attain in an adjustable mechanism a more direct and nearly straight path for the sound vibrations from the reproducing mechanism to the megaphone. Another object is to provide for the protection of the reproducing mechanism in its inoperative position, and

to enable a shallow lid or cover'to be employed.

Another object is to attain improved angular positions of the stylus with reference to therecord for either lateral or hill and dale types of record and for adjustments to both positions. Another object is to provide an improved pivotal mounting and adjustment for the tone arm to facilitate the travel of the reproducer across the face of the record. My invention also comprises certain details of form, combination and arrangement,-all of which will be fully set forth in the description of the accompanying drawings in which:

Figurel is a plan view of a talking machine record an tone arm embodying my improvements, with the reproducer in operative position.

Fig. 2 is a side elevation partly in vertical trating the position of the reproducer and stylus with reference to the hill and dale type of records. I

Fig. 6 is an enlarged sectional detail on line/v 'v of Fi 3, illustrating the pivotal mounting for t e stylus.

The accompanying drawings illustrate the preferred embodiment of my invention in which A represents the record. B represents the major section of the tone arm which is rotatably mounted upon a substantially vertical axis, and D is the minor tone arm section which is rotatably mounted upon and with reference to the tone arm section B so as to turn relative to the section B upon. the

axis indicated by the dotted line ZZ. At the free end of the tone arm section D is a face plate 2 to which the reproducer casing 3 L's-attached so as to be rotatably adjusted to a limited extent. The casing 3 is provided with the usual diaphragm and with outwardly projecting rigid ears 4 which are internally threaded to receive screws 5 having conical points or inner ends. A shaft 6 has cups or ball race-ways 7 at opposite ends, and balls 8, preferably three in'number in each cup, travel in said race-ways and are centrally engaged by the conical ends of the screws 5 which thus provide journal bearings at opposite ends for the shaft 6, which bearings'are capable of great accuracy and delicacy of adjustment to provide for rota tive vibration. of said shaft with a minimum of lost motion or lateral vibration. Lock nuts 9 serve to lock the screws 5 to their adjusted positions. The shaft 6 is provided .by means of a set screw 12.

The face plate 2 is seated at its periphery in an annular channel 14 in the casing 3, and a screw 15 tapped into the casing 3 has a reduced point 16 which enters'a groove 17 in the periphery of. plate 2 to limit the movement of casing 3 rotatively relative to plate 2. The groove 17 extends about one fourth around the circumference of plate 2 and hence enables the casing 3 to be adjusted to bring the shaft 6 and stylus to either the full line position of Fig. 3 to engage laterally out records, or to the dotted line position of Fig. 3 to engage the hill and dale type of records.

The tone arm section B has a conical face or raceway 18 to engage a Series of balls 19 which-travel in a raceway 20 in an annular plate 21. As illustrated the plate 21 is sea series of wood screws 22.

cured to the top of the casing E by means of By introducing a filling piece 24 under one edge of the plate 21 said. plate is given a slightly inclined depth to be employed.

position, and the section B being delicately journaled upon the balls 19 has more or less te dency to travel or swing toward the cen- -ter of the record, depending upon the thickness of the filler piece 24. This adjustment of plate 21 together with the ball bearing support for section B enables practically all lateral strain upon the stylus incident to propelling the tone arm :.,,ross the record to be relieved, since the inclination of plate 21 may be so adjusted as to practically overcome the inertia of the tone arm in "the direction of its feed across the face of the record. A plate 25 screwed to plate locks the balls 19 in place.

The sections B and D have each a shor straight section 26 and 27 at their meeting ends and the section 27 telescopes closely in section 26. A slot 28 in the section 27 engaged by the reduced end of a screw '29 threaded into section '26 to limit the rotative movement of section D with reference to section B. In Fig. 1 the operative position of section D illustrated in full line and its idle or inoperative position is illustrated in dotted line. As illustrated in Fig. 2 it will be noted that when the section D is in inoperative position the casing 3 and stylus ll occupy a position in a horizontal plane lower than the top of section B and alongside of. section B which serves to protect them from accidental injury, and that the tone arm and transmitting apparatus 00* cupy relatively less space vertically than where the transmitting apparatus rests upon the tone arm, thus permitting a lid K of less The manner in which the section D is movably mounted relative to section B also provides for a relatively greater distance between the axis 2 and the casing. 3, causing casing 3 to move throughan are of longer radius which provides for securing the desired angular position of casing 3 and its stylus With reference to the record, and rovides for adjusting the stylus circum erentially about casing 3 without materially disturbing or departing from the desired angular position of the casing and stylus. The mounting of the section I) upon section B also obviates any sharp or pronounced bend in the path to be traveled through said sections and provides for a nearly straight and direct and ample pill/ll for the sound vibra tions direct from the transmitter diaphragm .along the sections D and Bto the megaphone section F, which results in a superior tone and greater volume of sound.

The apparatus herein lllustrated and described is capable of considerable modifica- Elli:

tion without departing from the principle of larly adjust the axis of rotation of said tone arm to counterbalance the weight of the tone arm against its inertia to movement under the guiding influence of the stylus.

2. In a talking machine a tone arm rotatably mounted upon asubstantially vertical axis at one end and provided at its opposite end with a stylus to engage a record and by traversing the record groove to guide v said tone arm in a substantially horizontal direction across the face of the record, the axis of rotation of said tone arm being inclined from the vertical to substantially counterbalance the Weight of the tone arm against its. inertia to movement under the guidance by said stylus.

3. In a talking machine a tone arm rotatably mounted by means of a stationarily mounted race way a rotatably movable race way. and interposed rolling members upon a substantially vertical axis a stylus at the opposite end of said tone arm to engage a record and by traversing the record groove to guide said tone arm in a substantially horizontal direction across the face of the record, said stationarily mounted race Way being'inclined so as to predispose said tone arm to travel in the desired direction under the guidance of said stylus.

In testimony whereof I have affixed my I

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