US964684A

US964684A - Speed-regulating device for sound recording and reproducing machines.

Info

Publication number: US964684A
Application number: US47967009A
Authority: US
Inventors: George Culton; Charles Ablett; William Edward Lightfoot
Original assignee: Individual
Current assignee: Individual
Priority date: 1909-02-23
Filing date: 1909-02-23
Publication date: 1910-07-19
Anticipated expiration: 1927-07-19

Description

G. OULTON, G. ABLETTKL W. E. LIGHTFOOT. SPEED REGULATING DEVICE FOR SOUND RECORDING AND REPRODUGING MACHINES.

- APPLICATION PILD 113.23. 1909.

964,684, l"mamma Ju1y19,1910.`

lillllllli llllllIIIIIIIIIIEIIHIIIlm] Illllllllt M 15] Mw /M/ 772120722@ UNITED STAJIES4 PATENT OFFICE.

GEORGE OULTON, CHARLES ABLETT, AND WILLIAM EDWARD LIGI-ITFOOT, F LIVERPOOL, ENGLAND.

SEEED-REGULATING DEVIC FOR SOUND RECORDING AND IREIPRODTJ'CING MACHINES Patented July i9, i910.

Application led February 23, 1909. Serial No. 479,670.

To all whom it may concerm* Be it known that we, GEORGE OULroN,

CHARLES ABLETT, and WILLIAM EDWARD Liei-rrroo'r, subjects of the Kling of Great lritain and Ireland, residingat Liverpool, inthe county of Lancaster, ngland, have invented new and. useful Improvements in records and particularly to such machines' in which the speed of the motor can be continuously varied so that the relative linear speed between the record line and the stylus remains consta-nt, or otherwise stated, the angular speed of the motor increases or decreases according to whether the record commences at the periphery or near to the center of rotation.

TheV object of thisvinvention 'is to obtain the diilerential speed of the motor in ,a simple and eilicient *manner and dispense ,with any connection between the sound boX or carrier thereof and the speed controlling device, providing means at the saine time for indicating the proper position of the speed controlling device for records of different diameters.

The invention also provides that the motor can be r'un at a constant speed so that the ordinary or standard disk 'records'can be usedfat will.

Hitherto the speed of motors in recording and reproducing machines, has been Vcontrolled by a cam actuated by or with the sound box carrier, the cani bearing against the brake lever so Vas totconstantly vary its position, the sound -lbox carrier in some cases being traversed or.;v guided solely by the spiral record' groove or line through the stylus and in other cases a screw and nut being used to traverse the said carrier" and cam together, the latter moving across the brake. lever in contact therewith. In these two cases it is obvious that the sound box carrier being connected directly or indirectly to the speed changing device, the correctl starting speed would synchronize with the position of the stylus on the record disk.

According to our invention, the sound box .arm or carrier is'quite independent of the speed controlling device, and we employ a graduated scale and pointer to indicate the proper starting speed for dilerent sized records. z

The drawing attached hereunto, illustrates our invention applied to the ordinary speed controlling device used in sound re- `cording and reproducing machines.

In Figure 1 is represented an end elevation ot' the mechanism. Fig. 2 represents a plan of the same looking `from underneath. Fig. 3 represents a side elevation omitting some`of the parts for clearness sake.

Referring to the several views, 1 represents the motor shaft, 2 the base late of the mechanism, 3 theturntable or ast motion shaft, 4 the centrifugal speed controlling device and 5 the brake lever. The brake arm 7 of the brake lever, carrying the leather or like brake shoe 8 is fixed to a spindle 9' centered betweerivthe `base 2 and a bracket 10. The other arm 1]: of the brake lever,

is in the case illustrated approximately at iightV angles to the arm 7. A slideway consisting of a rod 12 fixed at one end in the bracket r13 is arranged alongside the arm 11 and upon this rod is a slide piece 14 carried at the end of .a tubular rod 15 into which the rod 12 telescopes. A handle such as a/milled disk 16 is fixed atv the end of the 4 rod 15 for the purpose of drawing it in and 'out and turning it partly round. f lhen the motor is Working, the brake disk 16 is drawn toward the brake arm 7 by the centrifugal action of the governor and keeps the arm 11 pressed against the slide piece 14. The inside :tace 17 of the arm 11 is approximately straight and when the nose 18 of the

slide piece

1,4 is in Contact with the arm toward its lower `end as seen in Fig. 2, the said face 17 lies" at an agle in relation to the slideway so that as the slidepiece is drawn out the. end of thearin 11. approaches the Slideway and the brakeshoe 8 recedes before theA governoidiskl. By this mea-ns, the motor can be setto run at any constant speed in the usual way by fixing. the position of the brake -arxn to accord with the desired speed, through the may also act as a stoppwhen the slide piece is pushed right down, by pressing hard upon the disk 16 when in its uppermost position. In order to automatically vary the speed of the shaft 3 as the motor is running down, by nieansoll the above described device, a fine *pitched screw 19 is mounted in bearings in the

brackets

13 and 20, parallel with the slide piece 14.2' The brake slideway 12. rlhis screw is turned continuously by the motor through the pinion 21 gearing with one of the wheels 22 of the motor. The slidepiece 14 isprovided with a pivoted arm 23 formed with a half nut 24: at its end, adapted to engage with the screw as shown, and by turning the milled disk 16, to be disengaged therewith. The finger 25 acts as a stop to the further turning of the slide piece when the nut is disengaged. The nose 18 of the slide piece is in the form of an arc as shown in Fig. 1, so that it remains in contact with the arm 11 when the milled disk 16 is turned either Way.

A convenient forni of indicator for setting the position of the slide piece increlation to the brake lever so that the correct starting speed can be obtained is shown in Fig. 3. The rod 15 is marked with a scale 26 representing thediifereiit diameters of records, and a pointer 27 is shown fixed to the base 1.

By disengaging the nutfrom 'the screw and pushing the rod 15 inward to its full extent, the .slide iece 14 forces the arm 11 away from the ideway and thereby jams the brake on vthe disk 16 preventing the inotorfrom working. By drawing the slide piece out the nut being still disengaged, the motor will run at a speed in accordance with the sensitiveness of the vernor and vvarying with'the position o the slide piece in relation to the fulcrum of the lever, in-

themanner generally used. By turning the rod 15 partly around and thereb 'engaging the nut with the screw, the latte revolving at a definite rat-e carries the slide piece along with it toward the fulcrum of the brake lever, assuming the nut was engaged toward the end of thearm 11, thereby causing the brake shoe 8 to gradually recede from thebrake disk when at rest, at a definite rate and controlling the brake pressure `applied through the centrifugal action of the governor.

Provision ismade for the nut to run 0H the threads of the screw by the clearance space 28.

What we claim as our .invention and'desire to secure by. Letters Patent of the United States isz-I 1. In machines for recordingand repro.- ducing sounds, in which disk records are employed, the combination with a motor having a centrifugal frictional speed'governor with a pivoted brake lever, of a slidable piece traversed by the motor along a slideway,an extending rod with handle and disengaging. means to set the slidable piece at any part of the slideway, an indicator to show the position of the slidable piece on the slideway, an arm on the brake lever iii a plane parallel' with the slideway, and means on the sliding piece and in connection with said arm so that as the sliding piece is moved eeaesa 2. In machines for recording and repro-4 ducing sounds, in which disk records are employed, the combinationlv with a motor having a centrifugal frictional speed governor with a pivoted brake lever,i offan arm fixed to the brake lever and having a straight edge, a slideway alongside said a/rin and in a plane parallel therewith, aslide piece on said slideway and having a sectoral face `to bear against the straightV edge of said arm,

said slide piece being adapted to turn angu- .larly on said slideway, a screw geared to the motor so as to turn therewith andparallel with the slideway, a half nut-fixed to said slide piece and adapted to engagewith or be disengaged from the screw when the'slide piece is turned, an extending rod xed to the slidepiece and provided with4 a handle'so that it can be. turned or drawn in--or out at will, and an indicator and scale for showing the longitudinal and engaging position of the slide piece and nut on the slideway for the 'purpose herein set forth.

3. In machines for recording and reproducing sounds, in which disk vrecords are employed, the combination with a-'motor having a frictional centrifugal speed governor with a pivoted brake lever, of a straight arm fixed to the brake lever, a round 4rod fixed alongside the said arm in a parallel plane, a screw geared to the motor so as to continuously rotate, and mounted in bearings so as to lie parallel with the said rod, a tube telescoped on said rod and having a handle at 'its outer end and a sectoralprojection'at its inner end adapted to bear against the straight side ofthe said arm of thel brake lever and remain in contact while being turned around, a stop to limit the angular movement of said tube, a half nut carried at the end of an arm iXed to the tube and said screw when the'tube is turned, a stationary pointer, and a scale marking on the said tube adapted to correspond with diiferent positions of sectoral projection, substantially as described and for the purpose herein set forth. i i 4. A speed regulating device for sound recording and reproducing machines comprising in combination, a governor for 'the machine provided with a braking member, a constant speed threaded rod operated by the machine, and a longitudinally and rotativel adjustable indicating member provided wit i.

a nut engaging said rod and a portion en:

of said machine.

5. A speed regulating device for sound recording and reproducing machines comprising in combination, a governor for the machine provided with a braking member, a

.adapted to engage with and disengage from A 'gaging said member for automatically and gradually reducing or increasing the speed 125,

const-ant speed threaded rod operated by the machine, a longitudinally and rotatively adjustable graduated indicating member provided with a nut engaging said rod and a portion engaging said member for automatically and gradually reducing or increasing the speed of said machine, and a pointer projecting abreast of the graduation on said indicating member.

6. A speed regulating device for sound recording-and reproducing machines comprising in combination, a. governor for the inachine provided with a braking member, a constant speed threaded rod operated by the machine, and a longitudinally and rotatively adjustable indica-ting member pio vided with a nut engaging said rod and an arcuate portion engaging said member for automatically and gradually reducing or increasing the speed of said machine, said arcuate member serving to maintain engage ment with said braking memberwhen said nu t is out of engagement with said rod.

A, speed regulating device for sound recording and reproducing machines comprising in con'ibination, a governor for the machine provided With a braking member having an extension, a constant speed threaded rod ope 'ated by tbc machine, and a. longitudinally and rrtatively adjustable indicating member provided with a mit engaging' said rod and a portion engaging .said meml #er for automatically and gradually reducing or increasing the speed of said machine, and a mounting for said indicator member for guiding the same abreast of said extension.

8. A speed regulating device for sound recording and reproducing machines comprising in combination, a governor for the machine provided with a braking member, a constant speed threaded element, and a 1ongitudinally and rotatively adjustable and movable indicating member having a portion engaging said braking member and a nut engaging Vsaid element, said indicating member when adjusted to disengage the nut from said element being adapted for longitudinal adjustment to stop the motor, allow it to run free under the governor, or retard the speed t0 a fixed rate, and serving when adjusted to engage the nut With said element to automatically increase or decrease the speed of the machine.

ln testimony whereof we have signed our names in the presence of two subscribing Witnesses.

GEORGE OUL'lON. CHARLES ABLETT. WILLIAM EDWARD LIGHTFOYI Witnesses WILLIAM Blier KENDRIGK, ltmLnY JAMES URQUI-IART.