US1850755A

US1850755A - Take-up device

Info

Publication number: US1850755A
Application number: US403768A
Authority: US
Inventors: Kindelmann Albert; Boecking Ewald
Original assignee: International Projector Corp
Current assignee: International Projector Corp
Priority date: 1929-10-31
Filing date: 1929-10-31
Publication date: 1932-03-22
Anticipated expiration: 1949-03-22

Description

A. KINDELMANN ET AL March 22, 1932.

'IAKE-UP DEVICE Filed 06*,- 31, 1929 2 sheets -sheet 1 w U. WW

I @M. HEB b B ATTORNEY Patented Mar. 1932 UNITED STATES PATENT OFFICE ALBERT KINDELMANN, 0F FLORAL PARK, AND EWALD IBOECKING, OF BBOOEYN, NEW YORK, ASSIGNORS '20 INTERNATIONAL PROJECTOR CORFOBA'IION, 0] NEW YORK,

N. Y., A CORPORATION OF DELAWARE Application fled October 81, 1929. Serial No. 408,768.

This invention relates to reeling devices and more particularly to a frictional takeup mechanism adapted to apply a substantially uniform tension to the material on a reel.

The invention relates more "specifically to a reel for a motion picture projection machine in which the film in fed at a constant speed and at a substantially uniform tens1on. The invention may, however, be. applied to other types of reels and winding apparatus as will be apparent to a person skilled in the art.

An object of the invention is to provide a frictional device which is ca able of frictionally exerting an operating orce on a reel which is dependent upon the weight of the material carried thereon.

Another object is to provide a frictional reeling device which is capable of maintainin the material supported by the reel at a substantially uniform tension regardless of the diameter of the material so carried.

A further object of the invention is to so vary the frictional force applied to a reel with respect to the speed of rotation of the reel and the diameter of the material carried thereon that a substantially uniform tension is applied to said material in reeling and unreeling.

Still another object is to provide a variable frictionaltake-up device for a reel and means for controlling ,the friction thereof for causing said device to act as a variable drive.

A feature of the invention is a frictional clutch for exerting a force on a reel which is determined by the weight of the material on the reel and the speed of rotation thereof.

Other objects and features of the invention will be apparent as the nature of the inven- Fig. 3 is a section ta en on the line 3-3 v of Fig. 2.

Like reference characters denote like parts in the several figures of the drawings.

In the following description and in the claims parts will be identified by specific names for convenience, but they are intended to be as generic in their application to similar parts as the art will permit.

Referring to the drawings more in detail,

the present invention is shown in Fig. 1 as applied to a reel for projection machines which includes a housing 10 having a shaft 11 mounted therein. Housing 10 is provided with an upstanding flange 12 to which a casing 13 maybe secured. Said casing forms a closure for the film magazine and may have door 14 associated therewith in any convenient manner. Housing 10 is provided with a bore 15 which is larger in diameter than shaft 11 and carries bearlng 16in which shaft 11 is journaled. i

- Brake collar 20 is secured to shaft 11 by suitable means such as pin 21 cooperating with an elongated slot 22 formed therein.

Nut 23 is carried on shaft 11 and serves to holdcollar 20 in its desired position. Thrust member 25 is journaled on shaft 11 and is provided with a spherical surface 26 which fits in a complementary surface formed on housing 10. Member 25 is revented from turning with respect to housing 10 by means of key 27 which is seated therein and cooperates with a keyway 28 formed in said housing. Friction disk 29 is journaled on shaft 11 between member 25 and break collar 20.

Shaft 11 is provided with a shoulder 30 which bears against thrust bearing 16 and preverits longitudinal movement of said shaft. Said shaft is also provided with a collar 31 havin a pin 32 which cooperates with a suitable s ot 33 in film reel 34 for positively securing the same to said shaft.

Reel 34 may be of any standard construction and accordingly will not be described in detail. It may be held against collar 31 by any convenient means such as lever 35 which is pivoted by pin 36 t0 the end of shaft 11 and is provided with cam surface 37 which cooperates with a lunger 38 seated in a bore in said shaft and eld against said cam surface by spring 39. Shaft 11 may be lubricated by suitable means such as oil cup 40 which is threaded into housing-1O and communicates with bore 15.

In the operation of the above described reel the shaft 11 is free to rotate in bearing 16 and is also free to pivot a slight amount therein. This pivotal movement is caused by the weight of the film carried on the reel at any particular time and produces a force which tends to raise thrust member 25 in housing 10. As said thrust member is raised in housing 10 the surfaces on the thrust member and the housing operate as wedges and cause said thrust member to exert transverse pressure on friction disk 29. The friction between disk 29 and break collar 20, which is determined by the pressure exerted on said friction disk, is accordingly varied in accord-- ance with the weight of the reel and a braking action is developed which is proportional to the diameter of the film on the reel.

The maximum amount of friction will be applied when a full reel is ositioned on shaft- 11 and this friction wil be progressively decreased as the film is unwound. Since the film travels at a constant speed the reel must rotate at a speed which is dependent upon the diameter of the film wh1ch is carried thereon. This is accom lished by decreasing the friction on bra e collar 20 as the weight of the reel decreases thereby permitting the reel to rotate at a faster speed.

Referring to the form of the invention shown in F1 2, parts identical with those in Fig. 1 have Iieen given corresponding reference numerals. It is to be noted that the invention illustrated in Fig. 2 comprises a driving mechanism for a reel and is particularly applicable to the lower film magazine of a motion picture projection apparatus. The reel 34 is shown mounted on shaft 11 which is journaled' in bearing 16 in the manner pointed out in connection with Fig. 1. Thrust member 25 is loosely journaled on shaft 11 and is held against rotation by pin 27 which is secured in said thrust member and seated in keyway 28 formed in said housing. Driving pulley 50 is loosely journaled on shaft 11 and is associated with thrust member 25 by means of a thrust bearing 51.

Collar 52 is secured to shaft 11 by suitable means, such as pin 53, which coo erates with an elongated slot 54 therein. pring 55 is coiled around collar 52 and seated between said collar and split nut 56 which is threaded on the end of shaft 11. Nut 56 may be locked on shaft 11 by suitable means such as set screw 57. Friction disk 29 is journaled on shaft 11 between pulley 50 and collar 52.

In the operation of the device illustrated in Fig. 2, a driving force is applied to pulle 50 by any suitable means (not shown). Pu ley 50, however, is normally free to rotate about shaft 11 and to slide longitudinally thereon.

The weight of the material on reel 34 causes shaft 11 to pivot about bearing 16, thereby raising thrust member 25 in housing 10. This movement causes the cooperating surfaces of the thrust member and housing to act as wedges whereby a longitudinal thrust is obtained which tends to move driving pulley 50 against friction disk 29. The friction exerted by said disk between pulley 50 and collar 52 causes a driving force to be transmitted from said disk to shaft 11 which is proportional to the weight of the material on reel 34. Since the diameter of the reel is directly proportional to the weight of the material thereon, the driving force wi ll be maintained such that a constant tension is applied to the material carried by the reel.

Although the cooperating surfaces between thrust member 25 and housing 10 have been illustrated as conical in form, it is obvious that various other configurations may be employed to obtain the desired wedging action. The force exerted through the friction member may be regulated by adjustment of nut 23 of Fig. 1 and of nut 56 of Fig. 2, the adjustment being such that the desired tension is maintained upon the film.

The invention has been described as applied to the upper and lower film magazines of a motion picture projection apparatus but it is not to be limited thereto. It may also be applied in various other devices in which a constant reeling tension is required.

While certain novel features of the invention have been shown and described and are pointed out in the annexed claims, it will be understood that various omissions. substitutions and changes in the forms and details of the device illustrated and in its operation may be made by those skilled in the art without departing from the spirit of the invention.

7 What is claimed is:

1. In a reeling device, a rotatable shaft, means for supporting said shaft for rotational and pivotal movement and for preventing longitudinal movement thereof, a friction member associated with said shaft, a second friction member loosely mounted on said shaft and adapted to move longitudinally thereof and a means controlled by the pivotal position of said shaft for causing longitudinal movement of said second member on the shaft proportional to the extent of said ivotal movement for varying the frictiona force transmitted from said second member to said shaft.

2. In a reeling device, a shaft, means for rotatably and pivotally mounting said shaft and for preventing longitudinal movement thereof, a clutch member associated with said shaft and movable longitudinally thereof and means controlled by the pivotal movement of said shaft for causing longitudinal movement of said clutchmember on said shaft proportional to the extent of said pivotal movement.

3. In a reeling device, a shaft, means for rotatably and pivotally mounting said shaft, a friction member loosely carried by said shaft and having a wedge surface, a stationary member cooperating with said wedge surface to cause longitudinal movement of said friction member with respect to said shaft and means whereby the longitudinal position of said friction member controls the frictional force transmitted to said shaft. I

4. In a reeling device, a shaft, a housing therefor, means for rotatably and pivotally mounting said shaft in said housing and for preventing longitudinal" movement thereof,

a friction collar secured to said shaft, a thrust member journaled on said shaft in frictional engagement with said collar and movable longitudinally thereof and means controlled by the pivotal movement of said shaft for caus ing longitudinal movement of said thrust member proportional to said pivotal movement whereby the force transmitted through saidfriction member to said collar is varied proportionally to the weight causing said pivotal movement.

5. In a reeling device, a shaft, a housing therefor, means for rotatably and pivotally mounting said shaft in said housing, a friction collar secured to said shaft, a thrust member journaled on said shaft in frictional engagement with said collar and having a wedge surface cooperating with a complementary surface of said housing, said'wedge surfaces being adapted to cause longitudinal movement of said thrust member proportional to the pivotal movement of said shaft whereby the force transmitted through said friction member to said shaft is varied.

6. In a reeling device, a shaft, a housing therefor, means for rotatably and pivotally mounting said shaft in said housing, a friction collar secured to said shaft, a thrust member journaled on said shaft and having a wedge surface cooperating with a complementary surface of said housing, friction means interposed between said collar and said thrust member, said wedge surfaces being adapted to cause longitudinal movement of said thrust member proportional to the pivotal movement of said shaft whereby the force transmitted through said friction member to said shaft is varied.

7. In a reeling device, a shaft, means for rotatably and pivotally mounting said shaft, a friction collar secured to said shaft, a thrust member journaled on said shaft and having a wedge surface cooperating with a complementary stationary surface, means for preventing rotational movement of said thrust member, friction means interposed between said collar and said thrust member, said wedge surfaces being adapted to cause longitudinal movement of said thrust member proportional to the pivotal movement of said shaft whereby the force transmitted through said friction member to said shaft is varied said thrust member, and friction means assdciated with said driving'pulley and cooperating with said collar for transmitting a force dependent upon thelongitudinal position of said pulley.

9. A take-up device comprising a shaft journaled for rotational and pivotal movement, a friction driving collar secured to said shaft, a thrust member journaled on said shaft and having a wedge surface, a housing having a complementar wedge surface adapted to cause longitu inal movement of,

said thrust member on said shaft in response to pivotal movement of said shaft, a driving i pulley loosely mounted on said shaft, a thrust bearing between said driving pulley and said thrust member whereby thelongitudinal position of said driving pulley is controlled and friction means interposed between said driving pulley and said collar whereby a force is transmitted from said driving pulley proportional to the extent of angular movement of said shaft. i

10. A take-updevice comprising a shaft journaled for rotational and pivotal movement, a friction collar secured to said shaft,

a thrust member journaled on said shaft and having a wedge surface, a housing having a complementary wedge surface adapted to cause longitudinal movement of said thrust member on said shaft in response to pivotal movement of said shaft, a driving pulley loosely mounted on saidshaft, a thrust hearing between said driving pulley and said thrust member whereby the longitudinal position of said driving pulley-is controlled by said member, friction means inter osed between said driving pulley and sai friction collar ada ted to transmit a force dependent upon the ongitudinal position of said ulley and resilient means for securing said rictlOIfi collar in engagement with said friction dis i 11. A take-up mechanism comprising a housing, a shaft journalled therein for pivotal and rotational movement, means for causing pivotal movement of said shaft in res onse to the weight of material carried t ereon, a friction member loosely mounted on said shaft, means controlled by the pivotal movement of said shaft for moving said friction member longitudinally with respect to said shaft and said housing, and means controlled by the longitudinal position of said friction member for determining the drag of said shaft. 4

12. A take-up device comprising a housing, a shaft journalled therein for pivotal and rotational movement, means for causing pivotal movement of said shaft in response to the weight of material carried thereon, a friction member looscly mounted on said shaft for longitudinal movement thereon, means associated with said housing and controlled by the pivotal movement of said shaft for causing longitudinal movement of said friction member with respect to both said housing and said shaft, and means controlled by the longitudinal position of said friction member for determinin the drag of said shaft.

A BERT KINDELMANN. EWALD BOECKING.