US2323066A

US2323066A - Apparatus for the picking up and reproduction of sounds

Info

Publication number: US2323066A
Application number: US362436A
Authority: US
Inventors: May Alajos
Original assignee: Individual
Current assignee: Individual
Priority date: 1939-10-24
Filing date: 1940-10-23
Publication date: 1943-06-29
Anticipated expiration: 1960-06-29

Description

June 29, 1943. MAY 2,323,066

APPARATUS FOR THE PICKING UP AND REPRODUCTION OF SOUND Filed Oct. 23, 1940 2 Sheets-Sheet 1 1 1 I I l' I L 1 "5 I. L I 34 I l IPTTU M E I! 16 I 6 h A20 H w w v A. MAY

June 29, 1943.

APPARATUS FOR THE PICKING UP AND REPRODUCTION OF SOUND Filed Oct. 23, 1940 2 Sheets-Sheet 2 Patented June 29, 1943 APPARATUS FOR THE PICKING UP AND REPRODUCTION OF SOUNDS Alajos May, Ssekesfehervar, El a"; vested in the Alien Property Custodian Application October 23, 1940, Serial him-362,436- In Hungary October 24,1939

1'. Claims.

The invention relates to apparatus for theo! the endless sound trace carrier, the sound trace carrier becoming wound-up on the outermost turn of the coil and being drawn-oi! from the innermost turn. r

This method of guiding the sound trace carrier ensures the substantial advantage of enabling sound trace carriers of practically unlimitfit ed length to be employed in a set for the picking-up and reproduction of sounds which possesses the usual dimensions. Another advantage obtained by this arrangement as compared to the arrangementsknown up to now which comprise an endless sound trace carrier and in which the sound trace carrier ribbon forms a simple loop, is

that sound trace carriers of greatly diflering' lengths may be employed in the same set.

Observation revealed the surprising fact that the smooth and uniform running 01 the sound trace carrier is not influenced by the loose coil formed in its path 01 travel. It is particularly in those cases that the unhindered winding-up and unwinding of the sound trace carrier as well as its quiet running can be assured in a satisfactory manner, in which that surface or those surfaces of the supporting member which are supporting the turns of the sound trace carrier are situated in an inclined position relatively to the path of travel of the sound trace carrier, i. e., obliquely, particularly if the said supporting member is inclined towards the interior of the loop, 1. e., in the direction of the section of ribbon leaving the coil.

The guiding according to the invention of the sound trace carrier enables lengths of ribbon of 1 to 10 metres and even ribbons of substantially greater length to be employed without any difllculty, which fact will in case of the employment of a ribbon of 25 mm. width render possible an uninterrupted picking-up or reproduction of 2 to 3 minutes per metre.

By way of sound trace carrier it is preferable to employ ordinary cinema film, the sound trace being cut into the rear face, devoid of emulsion, of the film.

In order to enable, in the case of the ribbon carriers oi diiierent lengths to be cut on the same set otpick-up and reproduction apparatus, the sound-box (pick-up) employed for cutting, is, according to the invention, being displaced by a special device, at a-velocity amenable to control, transversely to'the direction of travel oi the sound trace carrier.

Further details of the invention will be explained with referenoeto the drawings showing two embodiments o! the device for the picking-up and reproduction of sounds.

.l'ig. 1 is a front elevation,

Fig. 2 a planview of one embodiment of the apparatus for the picking-up and reproduction of sounds,

Fig. 3 is a section drawn to a greater scale through the driving gear of the pick-up in the case of the apparatus according to Figs. 1 to 2,

Fig. 4 is a plan view of another embodiment of this driving gear.

In the case of the embodiment according to Figs. 1 and 2, It is the sound carrier film and 8 is the toothed drum, driven by the motor 46 through the shaft 34 and the flywheel l2 and effecting the propulsion oi the sound trace carrier. The sound is picked-up by the sound' carrier above the. support I by mean of the pick-up It.

On the sound carrier glides a filing collector brush 53 which is pivotable around the pivot 22 and which occupies the position shown on Figs. 1 and 2-only when cutting the sound trace, whereas during sound reproduction it is swung out from this position. Behind this brush the sound trace carrier I 8 forms a loose coil it which is wound around the three rung-like fingers ll. These rungs are inclined relatively to the plane determined by those sections of the sound trace carrier which are running along straight-lined paths, the fingers being inclined in the direction of that section of the sound trace carrier which is running-off from the coil It. The sound tracevcarrier running-off from the roller 8 becomes wound on the outermost turn of the coil is and is again 7 being drawn-oil from the interior of the coil i6.

guiding according to the invention, sound trace 56 Following this the sound trace carrier it passes to the deflecting roller 6 and following that again to the support I.

The pick-up It comprises, as usual, an arm 23 pivotable around the pivot 25. On the arm 23 the pick-up I9 is arranged so as-to be pivotable around the joint H, the arrangement being such as to enable the pick-up to move in a direction perpendicular on the surface of the sound trace carrier. The arm 23 of the pick-up is supported in a guiding member I, the resilient wings ll of It is by means of a coupling composed of the

parts

65 and 56, that the spindle 9 is connected with the shaft It, a wormwheel 2| being fixed on that end of this shaft which is situated behind the board 20. The coupling part 55 carries a pivot 51 which in the operative position of the coupling engages into the recess 58 of the other coupling part 66. On the coupling part 55 a ring 58 is provided which is fixed to the said coupling part by means of a peg 60 and assures the axial position of the shaft ii, the ring 69 being supported on that front surface of the bearing 6| which faces the other coupling part 56. The part haltiiis'sup'ported on the one hand in the hearing. 62; and on the-other hand in the extension piece 63of't'he arm- I02 Between the extension on the shaft part 65 likewise, a compression spring" 66' beingprovided between the said ring and the extension piece '63. Thesprlng 66 tends to bring'the couplingj'ii, 561 into the operative position. A serratedwheel aiiis fixed on that end of the shaft part"'65 which projectsi'rom serves for re-setting the guiding member Mzinto the initial position. For this purpose the serrated wheel 35 is moved'in the'direction of the arrow 6;! and rotated in the corresponding sense,

carrier running over the drum 38 towards the pick-upefl'ects the rotation of the drum 38. On that end of the shaft ID of the drum' 38 which is situated behind the board 20, a screw spindle II is provided which through the worm-wheel 42 drives the screw-spindle 43, which latter drives the screw-spindle 9, as shown on Fig. 3, through the worm-wheel M and the shaft 45. As appears from Fig. 3, the said screw-spindle 9 carries the guiding member l4 comprising the wings l5. In the case of this arrangement the mechanical connection shown on Figs. 2 and 3 between the driving motor 46 and the spindle 9 is not reformed by the screw-spindle 9 and the coupling: 29

quired, nor is it necessary that the parts of the driving gear should, as shown on Figs. '1 to 3, be displaceable in the direction of the sound trace carrier; The adaptation of the transverse velocity of the pick-up to the actual length of the sound trace carrier is effected in the case of this arrangement in a simple manner by constructing the drum 88 "as an exchangeable drum'and providing, for each set of apparatus, a number of toothed drums 38 having different diameters. In

'piece63'and'thescrew-spindle9 a'ring' is fixed meachlcase'a"toothedldmm of Such diameter and accordingly of such number of teeth as corresponds to the length of sound trace carrier in- "the extension piece 53. 'lh e'ldevice described ,serted in the particular case is mounted on the 'shaftdll. .v

The supporting member for the loose coil oi support. r

During the displacement of the carrier 29 in the I slot 32 the arm i0 likewise moves in a slot 33 provided in the board 20 and extending in parallel to the sound trace carrier.

The screw 3i carries a pointer 36 which, during the motion of the screw 3| in the slot 32, moves along a metre scale 31. Before cutting the sound trace carrier, 1. e., before taking a sound record or before playing a sound trace carrier carrying a record cut into it, the pointer 36 is first of all adjusted on the metre scale 31 in accordance with the length of the sound trace carrier and secured in this position by means of the wheel 3b,

' the wings i5 together with the guiding member of the pick up arm in which the pick-up is moved transversely to the direction of the sound traces by. the motion of the sound trace carrier itself. In this case there is employed in place of the smooth. deflecting roller 6 a toothed drum 38 the teeth of which are engaging into the perforations of the sound trace carrier so that the sound trace Instead .of the-worm-gears shown in the figures it is of course also possible to employ any other desired kinds'of driving gear.

WhatI claim is:

1. In apparatus for the picking-up and reproduction of sounds for endless ribbon-shaped sound trace carriers a series of smooth obliquely inclined horizontally positioned fixed pins for supporting saidsound trace carrier and causing it to coil, a propelling drum for the sound trace carrier, a motor for driving this propelling drum, a guiding roller for the sound trace carrier, a pick-up for the picking-up and reproduction of sounds, arranged on a pivotable carrying arm-and a guiding member driven by the'running sound trace carrier for displacing the pick-up transversely to the sound trace.

2. In apparatus for the picking-up and reproduction of sounds for endless ribbon-shaped sound trace carriers a series of smooth-obliquely inclined horizontally positioned fixed pins for supporting said sound trace carrier and causing it to coil, a propelling drum for the sound trace carrier, a motor for driving this propelling drum, 2. toothed guiding roller for the sound trace carrier, a pick-up for th picking-up and reproduction of sounds, arranged on a pivotable carrying arm, a guiding member for displacing the pick-up transversely to the direction of the sound trace, and a transmission gear between the toothed guiding roller driven by the running sound trace carrier and the guiding member of the pick-up.

3. In apparatus for sound reproduction, a surT- port for a coil formed in an endless ribbon comprising a series of smooth pins fixed in horizontal positionsto enter and support the coil said pins being arranged obliquely relatively to the plane of the path of travel of the ribbon, whereby the running off direction of the ribbon is from the interior of the coil, an idler spaced from the coil support to have a loop of the ribbon extend from the inside of the coil beneath and around the idler to the outside 01' the coil, a ribbon driving mechanism over which the ribbon extending from the idler to the outside of the coil passes, an arm mounted at one end to swing on a vertical axis, a. pick-up carried by th free end of said arm to engage the ribbon between the driving mechanism and idler, means @ctuated from said driving mechanism engaging said arm and causing slow swinging movement of the arm and pickup as the ribbon passes beneath the pick-up, said means including a screw actuating the arm and detachably coupled to the driving mechanism, and means acting to uncouple said screw upon termination of the swing of the arm in one direction.

ALAJ OS MAY.