US1455093A

US1455093A - Speed control

Info

Publication number: US1455093A
Application number: US388926A
Authority: US
Inventors: Alvah C Roebuck
Original assignee: Individual
Current assignee: Individual
Priority date: 1920-06-14
Filing date: 1920-06-14
Publication date: 1923-05-15
Anticipated expiration: 1940-05-15

Description

May 15, 19 23.

msmm A. C. ROEBUCK SPEED CONTROL FiledZJune 14 1920 .4 Sheets-Sheet 2 fzzz'ezzz orz- A. C. ROEBUCK May 15 1923.

SPEED CONTROL F'iled'ZJune 14, 1920 4 Sheets-Sheet 3 Jay 3.-

- L455fl3 A. C. ROEBUCK sPEEnflcoNTRoL FiledZJune 14, 1920 U 4 Sheets-Sheet 4 2a WEE;

Patented May 15, 1923.

I uurrso' "stares ALVAHC. 'ROEBUCK, OF CHIGAGO, ILLINOIS.

SPEED common.

Application filed June 14,

To all whom it may; concern:

:Be it known that I, ALvAH C, RonBUoK, a citizen of the United States, residing at Chicage, in the county-of Cook and. State of Illinois, have invented certain new and useful Improvements in Speed Controls, of which the following is a specification.

My invention relates to speed controls and has for one of its objects the provision of a simple and e'fiicient speed control mechanism.

Another obj ectis the provision of a simple and eiiicient speed control adapted for use in connection with motionpicture projectors, and the like.

A. further object is the provision of apair of normally spring-pressed friction gears with a cooperating wedge-shaped or tapering gear mounted between said friction gears with means for relative movement of the gears. i

A further object is the provision of. a drivin mechanism for motion picture apparatus which eliminates the use of belts.

v A still further object is the provision of meansffor quickly and easily throwing the driving and driven gears out of operative condition. I

Other objects will appear hereinafter. 1

An embodiment of my invention is illustrated in the accompanying drawings, forming a part of this specification, and in which I g r Fig. 1 is a fragmental side elevation of a motion picture. projecting device equipped with speed control mechanism embodying my. invention;

Fig. 2 is a rear view of the same;

Fig. 3 is a vertical section showing internal parts; i

Fig. 4is a'vi'ew partly in section and partly in elevation looking in the opposite direction of that indicated in Fig. 3;

. Fig. 5 is-a section taken on line 5+5 of Fig. 4; i

Fig. 6 is an enlarged section taken through a motor bracket used in the construction; and c Fig. 7 is a frag-mental section taken through line 7-7 of Fig. 5.

Referring more particularly to the drawings, I have indicated a housing 10 of a motion picture device having a take-up reel casing 11 at its lower portion.

My device is applicable to various forms of motion picture apparatus now on the 1920. Serial No. 388,926.

market and can be applied toboth new constructions and devices already in use.

l Vithin the reel casing below housing 10 is provided a pair of bearings 12 and 13 in which my improved motor bracket 14 is journaled. The bracket 14 may be journaled in any desirable manner in the bearings 12 and 13. I have indicated a pivot shaft 1.5 on the bracket 14 which is journaled in bearing 12. Clamped on shaft 15 is a sleeve 17 which is of a length equal to the distance between the bearings 12 and 13 so that the bearings 12 and 13 hold the sleeve 17 against endwise movement. The sleeve 17 has an opening 18 in one side which communicates with a hollow portion 16 of shaft 15. A motor cable 15 extends through the hollow shaft 15 and out through opening 18 into casing 11 and from thence to a suitable source of supply. The sleeve 17 may be attached to the shaft 15 in any desirable manner. I have inclicated cars 19 having a screw 20 extending through them for clamping the sleeve on the shaft 15.. As a convenient means for assembling the sleeve 17 I have indicated a pivot pini2l at one end thereof formed separately and secured thereto by screw 22. It will be apparent, however, that the pivot pin 21 may be attached to the sleeve in any desirable manner.

An arm 23 isprovided on sleeve ,17 and this arm may be integral or formed in any other desirable manner. On the outer end Qfarm 23 I provide a roller 24 which engage a slot or groove 25 in a cam 26. The cam 26 is mounted on ashaft 27 which is suitably journaled in a bearing 28 in casing 11. On the outer end of shaft 27 is a lever 29 having a handle 30] thereon. The cam 26 can be operated by moving lever 29 by means of handle 30. tions 31 on an enlargement or dial of the bearing 28, as clearly indicated in Fig. 2,-as

a guide in turning handle 30.

On the bracket 14 I mount a suitable motor 32. In the present instance motor 32 is: indicated as an electric motor, but it will 'be understood that any other suitable motive power may be used when so desired. The motor 32 is provided with the usual motor shaft 33 and on this shaft is fixed a friction gear 34. The gear 34 is preferably wedgeshaped or tapering from its hub to its pe riph'ery, as clearly indicated in Fig. 2.

In the housing 10 is an upstanding ear I preferably provide gradua and on the outer end of said sleeve is a frie 10 and mounted in said'ear is a bushing 35. Journaled in the bushing is a sleeve 36,

tion gear 37. This friction gear may be formed in any preferred construction. I have indicated the gear as having a facing 38 of fiber or other friction resisting material.

Mounted in the sleeve 36 is a shaft 39, and on the outer end of shaft39 is a gear similar in construction to the gear 37 and having a friction resisting material. 38 corresponding to the friction resisting material 38 of gear 37. The shaft 39 is splined to the sleeve 36 in any desirable manner. The construction I have indicated is a pin 41 extending through the shaft with its end engaging slots 42 in the sleeve. Fixed on the shaft 39 is a gear 43 which is one of the gears of a train for driving the picture projecting mechanism. T he housing 10 also has a bearing 44 against which the hub 45 of gear 43 engages. The hub 45 of gear 43 may be made separate in the form of a collar or as a part of the gear 43, as desired. On the sleeve 36 is fixed a collar 46 which engages bushing 35 and limits the movement of sleeve 36 and gear 37 away from the housing10. It is desirable that a slight space is maintained'between the friction surfaces of

gears

37 and 40 so that the pe-' riphery of gear 34 may enter between the having been disengaged. This is accomplished by extending the hubs on the friction gears 37 and 40'so that they normally engage each other, see Fig. 5. Between the end of sleeve 36 and gear 43 is a compression spring 47 which tends to movethe

gears

37 and 40 toward each other and

hubs

37 and 40 together and leave a slight space between hub 45 and bearing 44.

. I have indicated a pin 48 mountedfor longitudinal movement and at one end I provide a cam 49 operated by a lever 50. Upon movement of the lever 50 toward the left-hand side of Fig. 5 cam 49 and pin 48 would move shaft 39 and gear 40 away from housing 10, thereby freeing the taper gear 34 from operative engagement between the friction surfaces 38. This provides means for rendering the friction driving mechanism inoperative without changing; the lever 29 with relation to dial 28. "When an operator has his machine set for av desired speed and it is necessary to disconnect the motor for a short time he can do so by simply turning lever 50 to disconnect the; friction gears and then when ready to start again simply throw his lever back to its position indicated in Fig. 5 to place the device in condition to run at the same speed it was before. .lVhen cam 49 is operated the tension on spring 47 of course will be increased and this extra pressure tends to move gear 37 toward gear 34, but in the sleeve 51 is a bearing 53 in which is mounted a shaft 54. I have indicated screws 55 and a slot 56 in the lower portion of bearing 53 to provideadjustmentbetween the hearing 53 and sleeve 51 so that the bearing 53 will be held against movement on sleeve 51.

Journaled on the shaft 54 is a gear 57 which meshes with gear 43. The shaft 54 also carries a pinion 58 which meshes with a main gear 59 of the film-feeding mechanism of the device. Also, onshaft 54 may be provided a pulley 60 which can be connected with a film' take-up device, not shown, when so desired.

The ear 10 and bearings 44' and 52 are attachedto the stationary housing 10 and shaft 61 carrying gear 59 is mounted on a frame 62 which is mounted for vertical adjustment on shaft 63, see Figs. 3 and 4. To keep the

shafts

54 and 61 in proper relation during the adjustments of frame 62 I provide a link 64 which hasone end engaging shaft 54, seeFig. 5,and its otherend engaging a boss 66 around shaft 61, see Fig. 4. This maintains gears 58 and 59 in mesh regardless of the adjustment up and down of shaft 61.

The motor or the source of power supplying the motor may be rendered incapacitated for a short time and in such a case it is desirable to disconnect the motor driving mechanism so that shaft 61 can be operated by hand power or otherwise. In order to do this I have provided a helical slot 67 in .69 for manual operation. This mechanism is provided to move shaft 39 longitudinally to disconnect gear 43 from gear57. This leaves shaft 61 free for operation without driving the shaft 39 and the multiplied gearing between

shafts

54 and 39.

The parts are so designed that roller 24 engages end 25 of slot 25 to limit the movement of gear 34 out from between

gears

37 and 40. 'The parts may be so arranged that gear 34 may be entirely withdrawn from between

gears

37 and 40 or with a small portion of said gear 34 yet between gears 37 and40, as desired. It will be desirable, however, to arrange the parts so that when roller 24 engages end 2550f slot 25 that the driving connection between gear 3% and the two friction gears 37 and 40 will render the motor inoperative. Then upon moving the roller 24 around slot 25 toward the. other end of the slot the gear 34 will be moved into operative engagement with gears. 37 and 40. The farther gear 3.4: is moved in between gears 37 and 4.0 the slower will he the relative speed between said gears due to the fact that gears 37 and 40 will engage gear 34 nearer the axis oft-he latter.

claim 1. A speed control comprising a motor bracket pivotally mounted; an arm extending laterally from and rigidly attached to said motor bracket; a shaft disposed tangentially to the axis of the motor shaft; a cam on said shaft having a spiral cam groove therein engaging the free end of said arm; and manually operable means for rotating said shaft.

2. A speed control comprising a motor bracket pivotally mounted; an arm extending laterally from and rigidly attached to said motor bracket; a shaft disposed tangentially to the axis of the motor shaft; a cam on said shaft having a spiral cam groove therein engaging the free end of said arm; a dial disposed around said shaft; and a manually operable handle fixed on said shaft adjacent to and adapted to cooperate with said dial.

3. A speed control comprising a housing having bearings therein; a motor bracket; a pivot shaft rigidly attached tosaid bracket and journaled in one of said bearings; a sleeve journaled in another of said bearings and clamped on said pivot shaft; an arm on said sleeve; and manually operable means for controlling oscillatory movements of said bracket and sleeve.

4:. A speed control comprising a motor bracket having a pivot shaft attached thereto; bearings engaging said pivot shaft; an arm attached to. said bracket; rotary means operatively engaging said arm and adapted to swing the bracket on its pivot shaft and speed change gearing associated with said bracket.

5. A speed control comprising a motor bracket having a pivot shaft attached thereto; bearings engaging said pivot shaft; an arm attached to said bracket; a cam engaging the arm and adapted to swing the bracket on its pivot; and speed change gearing associated with the bracket so that swinging of the bracket changes relations of parts of the speed change. gearing.

6. A speed control comprising a bracket having a pivot shaft attached thereto, there being an opening through said shaft; a sleeve clamped on said pivot shaft with an opening therein registering with the open ing of said shaft; an arm on the sleeve; a

member pivotally mounted and having a spiral cam groove therein engaging said arm; and speed change gearing associated with the bracket. 1 i V 7., A speed control comprising a sleeve; a shaft journaled in the sleeve; means splining the sleeve on said shaft; driven gears on said sleeve and shaft; a spring exerting force on said shaft and sleeve tending to move the gears toward each other; a dri ing gear extending between said driven gears; and a cam operatively connected with said shaft for moving the latter longitudinally to spread said driven gears apart.

8. A speed control comprising two bean ings; a sleeve journaled in one of said bearings; a shaft journaled in the sleeve and said other bearing; friction gears on said sleeve and shaft; a pin and slot connection between the shaft and sleeve; a spring tending to hold-the friction gears together; a driving gear tapering toward its periphery extending between said friction gears; and manually operable means engaging the end of said shaft for moving the latter axially to disconnect the gears.

9. A speed control comprising two spaced bearings; a sleeve iournaled in one of the bearings; a shaft journaled in said sleeve and the other bearing; a spline locking the sleeve and shaft together; friction gears on the sleeve and shaft; a spring tending to move the gears toward each other; a pin mounted in the second mentioned bearing and engaging said shaft; and means for moving said pin against said shaft to separate said gears.

10. A speed control comprising a sleeve; a shaft journaled in the sleeve; means splining the sleeve on the shaft; friction gears on said sleeve and shaft: spring exerting force on said shaft and sleeve tending to hold the gears together; a gear extending between said friction gears; means asso ciated with the friction gears for moving the latter out of engagement with the gear extending between said friction gears; a pin engaging said shaft; and a cam engaging said pin adapted to disengage said friction gears from the gear extending between said friction gears.

11. A speed control comprising two bearings; a collar mounted in one of said bearings having a spiral groove therein; a screw in said bearing engaging said spiral groove; a sleeve journaled in said collar; a shaft journaled in said other bearing and splined in said sleeve; a pinion on said shaft; a compression spring around said shaft and bearing against an end of said sleeve and said pinion; friction gears on said shaft and sleeve; a pin engaging the end of said shaft; manually operable means engaging said pin for moving the latter axially against the end of said shaft; a lever fixed to said collar for rotating the latter; and a collar fixed-on said sleeve and engaging the first-mentioned collar.

andsleeve; and hubs on said friction gears holding the pressure of said spring on said collars from said bearings.

13. A speed control comprising a sleeve; a shaft extending through the sleeve; friction gears on the shaft and sleeve; aspring exerting force on the shaft and sleeve tending to hold the gears together; a gear extending between said friction gears; a pin engaging one end of said shaft; and a manually operable cam engaging said pin adapted to move said shaft to free said friction gear from the gear extending between said friction gears.

14. A speed control comprising an ear; a bushing mounted in said ear; a sleeve in the bushing; a bearing; a shaft mounted in the sleeve and bearing; a pinion on said shaft; a gear meshing with said pinion; and means associated with said bushing for moving said pinion longitudinally of said shaft out of mesh with said gear.

15. A speed control comprising an ear; a bushing mounted in said ear and having a spiral groove therein; a sleeve mounted in said bushing; a bearing; a shaft mounted in said sleeve and bearing; a pinion on said shaft; a gear meshing with said pinion; a screw threaded in the ear andengagingsaid spiral groove; and a handle on said bushin 16. A speed control comprising an ear; a bushing in said ear and having a spiral groove therein; a .pin mounted in said ear and extending into said groove; a sleeve journaled in the bushing; ashaft journaled in the sleeve; friction gears on said shaft and sleeve; means tending to move the friction gears toward each other; and a friction gear extending between the first mentioned friction gears.

17. A speed control comprising a housing; a motor bracket having a pivot shaft journaled in the housing; an arm on said pivot shaft in the housing; a hand operable shaft extending into said housing; a cam on the shaft engaging saidarm; a motor on the bracket having a friction wheel thereon; and

wheel engaging the friction wheel on said motor.

l9. A speed control comprising a motor bracket mounted for pivotal movement; a motor fixedon said bracket and having a gear thereon; a pair of gears resiliently pressed toward each other engaging opposite sides of the gear on said motor bracket; an arm on said bracket; and a rotary member having its axis tangential to the axis of the bracket and. having threads thereon engaging said arm for swinging the latter and said bracket on their axis.

20. A speed control comprising a motor bracket mounted for lateral movement; a motor fixed on said bracket and having a motor shaft; a friction gear fixed on said motor shaft; two springpressed friction gears engaging opposite sides of the gear on saidmotor shaft; means for moving said motor laterally; and means for spreading the spring-pressed friction gears out of engagement with the gear on said motor shaft.

21. A speed control comprising a sleeve; a shaftsplined in said sleeve; friction gears on said shaft and sleeve; a. .spring attached to the shaft and sleeve tending to move the friction gears toward each other; manually operable means connected with the shaft for moving the latter axially independently of the sleeve; and means for moving the sleeve axially independently of the shaft.

In testimony whereof I have signed my name to this specification on this 27th day of May A. D. 1920.

'ALVAH o. ROEBUCK.