US3923266A - Endless film winding or unwinding device - Google Patents

Endless film winding or unwinding device Download PDF

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US3923266A
US3923266A US423976A US42397673A US3923266A US 3923266 A US3923266 A US 3923266A US 423976 A US423976 A US 423976A US 42397673 A US42397673 A US 42397673A US 3923266 A US3923266 A US 3923266A
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reel
reels
band
arm
utilization device
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US423976A
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Jean Paul Boyer
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/32—Details specially adapted for motion-picture projection

Definitions

  • ABSTRACT An apparatus for the continuous winding and unwinding of an endless band adapted to be fed to a utilization device comprising simultaneously winding two lengths of the endless band in superposition on a first rotating reel while simultaneously unwinding two superposed lengths of the band from a second reel rotating in opposite direction.
  • One length of the band is passed from the second reel to the first reel while the second length of the band from the second reel is passed to the utilization device and the length of film traversing the utilization device is passed to the first reel.
  • the length of the band traveling from the utilization device to the first reel is displaced onto the hub of the second reel to form a loop so that the band can now be wound in two superposed lengths on the second reel while being unwound from the first reel, the direction of rotation of the reels being reversed.
  • the invention relates to apparatus for continuous winding and unwinding of an endless band.
  • the invention is applicable to cinematographic projective apparatus and to magnetic reading apparatus.
  • the objective of the invention is to permit cinematic projection or magnetic reading in continuous and automatic manner without it being necessary to reload the projector or the magnetic reader or to proceed with a rewinding of the film or bands.
  • the apparatus of the invention permit continuous and automatic feeding of an endless film or band of substantial length to a utilization or treatment apparatus.
  • suitable utilization apparatus to which the invention is applicable are sound reproducing equipment, apparatus for controlling the operations of work machines and all types of apparatus capable of being utilized with tape or film of great length.
  • the film whose extremities are joined to constitute a closed loop is wound in superposed turns on the middle of a hub.
  • One length of film is unwound from the interior of the hub and is fed to the projector and after passage therethrough is wound onto the outer periphery of the film on the hub.
  • An object of the invention is to provide an apparatus by which the disadvantages associated with the prior art are overcome.
  • a further object of the invention is to permit the mounting and projecting of a complete program, such as newsreels, cartoons, documentary film, commercial announcements and full-length feature film in succession on a single endless band having a substantial length of the order of 5,0006,000 meters or more without any risk to the film and under ideal conditions of winding and unwinding without any interruption of the projector.
  • the invention is characterized in that there is wound simultaneously two lengths of an endless band of film on a reel disposed in the interior of the endless band and on a reel disposed externally of the endless band, the film traveling along a path in which one length extends between the external reel and the downstream end of the projector at the time of feeding the interior reel when the latter is empty, and between the interior reel and the downstream end of the projector at the time of feeding the external reel when the latter is empty.
  • the invention comprises simultaneously winding two lengths of the endless band in superposition on a first rotating reel, while simultaneously unwinding two superposed lengths of said band from a second rotating reel, passing one length of the band from the second reel to the first reel while passing the second length of said band from the second reel to the utilization apparatus and passing the length of film traversing the utilization apparatus to said first'reel.
  • the band travels along a closed loop between the reels and the utilization apparatus, one reel being in the interior of the loop, the other reel being external thereof.
  • the invention further comprises diverting onto said second reel the length of the band traveling from the utilization apparatus to the first reel after said second reel is exhausted of band to form a loop so that the band can now be wound in two superposed lengths on said second reel while being unwound from the first reel, the direction of rotation of the reels being reversed.
  • the apparatus comprises a first rotatable supply reel and a second rotatable takeup reel, reversible drive means for said reels, said reels being arrayed with respect to the utilization device such that two lengths of the band are wound in superposition on both reels and extend between both reels and the utilization device, one length on said second reel extending to the first reel, the other length on said second reel extending to said utilization device and traversing the same, said first reel receiving the length of the band issuing from the utilization device, said band forming a closed travel loop between said reels and the utilization device, one of said reels being in the interior of said loop, the other reel being external thereof; and feed means for placing against the second reel the length of band extending between the utilization device and said first reel when said second reel is empty whereby by reversing the direction of rotation of the reels the first reel can now become the take-up reel and the second reel the supply reel.
  • said feed means comprises a feed arm pivotably mounted between said reels, and a retractable finger adjustably mounted on said arm for longitudinal displacement therealong and spring means acting on said arm and finger for urging said finger to a rest position out of contact with said band.
  • each reel includes a hub having a notch in the periphery thereof in which the band is introduced as a loop by said finger, and a cheek with a curved ramp positioned to guide the finger to the notch in said hub.
  • guide means including at least one movable guide roller at said inlet and outlet of the utilization device for forming respective loops of compensating and reserve amounts of said band.
  • a selector including control means for controlling the movement of said feed arm between a rest position between said reels and two active feed positions in contact with the respective reels, means for halting the drive means of the take-up reel and activating the drive means of the supply reel when the latter is empty, means for maintaining the arm in feed position on the hub of the take-up reel for a sufficient time to wind a number of turns of band in the take-up reel so that when the arm is removed the band will continue to be wound on the take-up reel, and means for rocking said feed arm and/or retracting said finger.
  • FIG. 1 is a diagrammatic side elevational view of the installation according to the invention
  • FIGS. 2 and 3 are schematic views intended to facilitate a comprehension of the operation of the installation
  • FIG. 4 is an elevation view of a reel used in the installation of the invention.
  • FIG. 5 is a diagrammatic elevation view showing the mounting of a microswitch in the hub of a reel
  • FIG. 6 shows a control lever of the microswitch
  • FIG. 7 is a schematic illustration in section of the rotatable support of the axle of a reel
  • FIG. 8 is a detail view partly broken away and in section showing the articulation support of a feed arm of the installation
  • FIG. 9 is a view similar to FIG. 1 in which certain elements have been omitted to reveal certain details of construction;
  • FIG. 10 is a perspective view of a selector apparatus controlling the operation of the installation
  • FIG. 11 is a diagrammatic illustration of the principal elements of the selector apparatus showing their connection in a circuit diagram
  • FIG. 12 is a front elevation view of the feed arm of the installation
  • FIG. 13 is a top plan of the arm
  • FIG. 14 is a rear elevation view of an extremity of the arm in partial section
  • FIG. 15 is a sectional view taken on line ll515 in FIG. 14;
  • FIG. 16 is an end view, partly in section, apparatus for interrupting the drive of the reels
  • FIG. 17 is a sectional view taken on line l7-17 in FIG. 16;
  • FIG. 18 is a top plan view, partly in section and on enlarged scale, of the apparatus shown in FIGS. 16 and 17;
  • FIG. 19 is a front elevation view diagrammatically illustrating a brake apparatus for the take-up reel utilizable in place of the apparatus in FIGS. 16-18;
  • FIG. 20 is a plan view of a movable assembly for a reserve loop of film at the exit of the film banding apparatus
  • FIG. 21 is an elevation view diagrammatically illustrating a means for braking rotation of the reels when they operate as supply reels;
  • FIGS. 22-27a are schematic views showing the apparatus in various stages of operation.
  • the installation comprises two reels 1 and 2 which in characteristic fashion according to the invention are disposed one above the other and are mounted on respective axle supports permitting them to be driven in rotation by means of any suitable electric drive motor.
  • the cinematographic film F is constituted as a closed loop and is fed from one reel to the other while traversing a projector P as will be explained more fully later.
  • the frames of the 'film constituting a complete program are arranged one following the other in their order of passage and the extremities of a band of great length, thus obtained, is assembled by a conventional adhesive.
  • the endless band formed by such a complete program can thus have a very substantial length, for example, of the order of 5,000 to 6,000 meters or more.
  • the winding hub of one of the reels is disposed in the interior of a closed loop which the film defines as it travels from one reel to the projector and back to the other reel as will be explained more fully later, while the winding hub of the second reel is external of the loop.
  • reel 1 which will be called the upper reel hereafter. This arrangement is best seen in FIG. 26.
  • the reel 2 which will be called the lower reel is disposed at the exterior ofthe loop as can be seen in FIG. 23.
  • the reels 1 and 2 each comprise a winding hub 3 of generally cylindrical form and two cheeks, of which one is a front cheek 4 and the other a rear cheek 5, both cheeks being solidly fixed to the winding hub.
  • the front check 4 has at least one notch 6 at the inner periphery thereof.
  • the notch 6 registers with a cylindrical notch 3a formed at the periphery of the hub 3; cylindrical notch 3a has an axis extending parallel to the axis of the hub.
  • the front cheek 4 of each reel comprises one or more blades and preferably, as seen in FIG. 4, three equally spaced blades 4a of particular form, this number suitably meeting conditions for mounting and utilization of the reels in the described application.
  • the front and rear edges of each blade constitute two ramps of opposite inclination which join to form an angle whose apex is at the free extremity 4f of the blade.
  • each blade With respect to the direction of rotation of the reels in their receiving function as the take-up reel, the front edge of each blade forms two ramps 4b and 4c of opposite inclination.
  • the exterior ramp 4c is rectilinear and forms an acute angle with respect to a line joining the extremity 4f of the blade and the axis of the reel.
  • the interior ramp 4b is of concave curved form and its internal extremity extends directly into notch 3a at the periphery of the winding hub 3 of the reel.
  • cavities or cells 3a which will be called loop cavities hereafter.
  • each blade is constituted by two rectilinear ramps 4d and 4e of opposite inclination, the exterior ramp 4e also forming an acute angle with the line joining the extremity 4f of the blade and the axis of the reel.
  • the interior ramp 4d has a length much greater than that of the exterior ramp 4e, and ramp 4d extends to the region of the hub 3 of the reel.
  • Ramp 4d also has an oblique disposition with respect to the line joining the axis of the reel and the extremity 4f of the blade and preferably is not sharp or capable of effecting a shearing function.
  • This conformation of the front cheek of each reel is effected, on the one hand, so that nothing opposes a feed arm 7 which will have just occupied the positions following alternative advance and start of the drive motors of the reels and on the other hand, to drive the film loop presented by a finger 7a of the feed arm to one of the loop cavities 3a.
  • the finger 7a is guided by the curved ramp 4b of one of the blades 4a, in a manner which will become apparent later.
  • the reels 1 and 2 are driven in rotation in opposite directions in their respective operating functions.
  • the curved ramp of the blades of the front cheek of one of the reels has an opposite disposition relative to the curved ramp of the blades of the other reel.
  • the portion of the length b (FIG. 2) of the film between the interior roller 10a of a group of rollers disposed at the entrance of the film handling apparatus and the tangent of winding T of this length on either one of the reels effects a minimal angular inclination with respect to the limit positions of the feed arm 7.
  • the finger 7a of the feed arm can thus easily occupy a rest or waiting position next to length b opposed to the side of the unwinding reel as will be seen hereafter.
  • the reels In their receiving operation as take-up reels, the reels roll on an imaginary plane passing through the pivot axis of the feed arm, in a direction away from said axis.
  • the apparatus comprises a means for alternately controlling the feed to wind the film on one or the other of reels 1 and 2.
  • this feed means is constituted by the pivoting arm 7, at the free extremity of which is retractable finger 7a.
  • the finger 7a is mounted for longitudinal adjustable movement with respect to shaft 8 which pivotably carries the arm 7.
  • the pivot axis of the arm is disposed at a level between the reels 1 and 2, at a judicious distance from a plane passing throughthe centers of said reels.
  • Two groups of guide rollers are disposed respectively at the exit and at the entrance of the projector and the roller group at the entrance includes at least one tension and compensator roller 9 while the roller group at the exit includes at least one tension and compensator roller 10.
  • the groups of rollers provide for reserve loops or film b and b downstream and upstream of the projector P or other utilization apparatus.
  • the group of rollers including the roller 9 serve for guiding the length of film b towards the projector P, while the group of rollers including the roller 10 guides the length of film b leaving said projector.
  • Other return and guide rollers 11 can be advantageously disposed in proximity to the periphery of the upper reel, notable to avoid contact of the lengths of the endless band traveling in opposite directions.
  • the means for control of the drive disposition of the arm 7 and of the drive motors of the reels are lodged in the hubs 3 of the reels.
  • These means comprise a microswitch 12 (FIG. 5) connected to a collector 13 (FIG. 7) disposed on the external face of the rear cheek 5 of the reel and on which rubs a brush carried by the frame of the installation, as will be explained hereafter.
  • the switch 12 of each reel is actuated when the last turn of the film leaves the reel as it is unwound.
  • Other suitable control apparatus could be lodged in the hub 3 of the reels, such as a photo-electric cell or the like.
  • Each reel is mounted on an axle l4 turning in bearings (not shown) which can be provided in vertical partition 16a of frame 16 of the installation.
  • This auxiliary reel has a winding capacity which is at least one-half of the winding capacity of reels 1 and 2.
  • the upper reel 1 (disposed at the interior of the closed loop) winds simultaneously two lengths of the film of which one length (b proceeds from the projector while the other is fed from the lower reel 2 (situated outside the closed loop). Reel 2 also unwinds length b, going to the projector P.
  • the lower reel is driven in rotation in a direction opposite to that when it served as the supply reel.
  • the lower reel When the upper reel is empty, the lower reel is freely rotated and the length b situated between the lower reel and the projector is fed (as shown in dotted lines in FIG. 3) by means of finger 7a on arm 7 against the hub of the upper reel which is now situated in the opposite direction.
  • the finger 7a introduces a small loop of film in the cavity 3a of the hub of the upper reel and as described previously, two lengths of film are simultaneously wound on this hub. One length comes from projector P while the other is fed from the lower reel which also unwinds length b, to the projector P.
  • the apparatus described it is understood that there are alternatively wound two lengths of the endless band on one of the reels while the second reel unwinds in continuous and automatic manner. Accordingly, the film travels via length b, in uninterrupted manner to the projector or other utilization apparatus.
  • a microswitch 12 is lodged in the winding hub 3 of each reel. This switch serves to send a signal to an electro-magnetic apparatus to effect displacement of the feed arm 7 and the control of the drive motors for the reels after the last winding of the film unwinds from the supply reel.
  • the switch has a control element of T shape with a vertical arm 12a and an upper horizontal branch 12c disposed parallel to the axis of the cylindrical hub 3.
  • the arm 12a is slidingly mounted in a radial bore 3b in the hub 3 and the control element is subjected to the action of a spring 12b urging the upper branch 12c outwardly from the bore as seen in FIG. 5.
  • the control element is lowered in the bore when the film is wound on the hub 3, and it is automatically raised as soon as the last winding is unwound from the hub.
  • the rotational drive of the reels is effected by means of a plate 18 secured on each shaft 14.
  • each plate 18 is provided with at least one entrainment spur 18a adapted to engage in a cavity 3c provided in the front face of the winding hub of the associated reel.
  • the rear face of the plate 18 comprises an insulating section carrying a conductive contact ring or collector 13 on which rubs a brush apparatus 28 which can be supported, for example, by the vertical partition 16a of the frame of the apparatus.
  • the electrical contact between the collector 13 and the switch 12 is realized via the engagement of the spur 18a in the cavity 3c, to which conductors are respectively connnected and led to the collector 13 and the switch 12 as seen in FIG. 5.
  • the finger 7a of the pivotal feed arm 7 is mounted for longitudinal displacement on the arm. Accordingly, as illustrated in FIGS. 12 to 15, the distance between the finger 7a and the pivot axis through shaft 8 is variable.
  • the shaft 8 is carried by the vertical partition 16a of the frame and permits pivoting movements of the feed arm 7 between a rest position and a feed position, for each reel 1 and 2.
  • the feed arm permits the introduction of a small loop of film into one of the loop cavities in the hub of one of the reels such that the rotation of this reel assures the simultaneous winding of two lengths of film on the hub.
  • the retractibility of the finger 7a of the feed arm can be effected by a displacement of this finger parallel to its axis, for example by means of a suitable electromagnetic apparatus.
  • the retractibility of the finger 7a is obtained by a lateral pivoting movement of arm 7 perpendicular to the direction of pivoting of arm 7 between the reels.
  • the arm 7 is pivotably connected at a suitable point remote from its free extremity, by means of pointed screws 19 (FIG. 8). These screws are secured to two opposed walls 20a of a tubular support 20; the support 20 is fixed to the shaft 8.
  • the pivoting of the arm 7 is controlled by an electromagnetic apparatus constituted by an electromagnet 21 carried by the support 20 and capable of applying an attraction force on the front extremity of the arm 7 when it is energized.
  • a spring 22 is interposed between the support 20 and particularly, between the edge of a solid member integral with said support and the arm 7 at a location rearwardly of the axis of articulation 19, to automatically return said arm to its normal rest position when the attraction force applied by the electromagnet 21 is terminated.
  • a screw 23 is mounted in the front wall of the support 20 and rests against the front face of the inner portion of the arm 7 to regulate the degree of pivoting of the arm. It is to be understood that arm 7 has sufficient lateral clearance in support 20 to enable arm 7 to undergo sufficient lateral displacement to withdraw the finger 7a from the loop cavities. To facilitate its extraction from loop cavities 3a, the finger 7a has a conical form. The finger is constituted by a roller mounted for free rotation on an axle 7j.
  • rollers each including at least one stretcher and compensator roller 9 or are disposed, respectively upstream and downstream of the projector P.
  • rollers serve the function of providing a reserve loop of a length of film sufficient to avoid tension between the film handling apparatus and the projector or for absorbing supplementary lengths fed by the projector or by the film handling apparatus.
  • the roller 10 in forming a compensating loop 11 of film avoids tension in the length b coming from the projector when the last winding of film is unwound by the supply reel, during the time necessary to stop the take-up reel and allow it to undergo free rotation in the opposite direction.
  • the roller 9 principally serves to absorb additional length of film resulting from the liberation of the last winding of film unwound by the supply reel in constituting a compensating loop or reserve of film [1,. (FIGS. 2 and 3)
  • a compensating loop or reserve of film [1,. (FIGS. 2 and 3)
  • the roller group disposed at the exit of the film handling apparatus and upstream of the projector comprises for example, three upper rollers 9a-9b-9c (FIG. 1) each mounted for free rotation on fixed axles supported by a bracket 16b fixed to the upper part of the frame 16 of the installation and two lower stretcher and compensator rollers 9-9.
  • rollers 9-9 are carried by a support 28 slidingly mounted on a guiding means, for example, constituted by two vertical columns 29, fixed at their opposite extremities, on the one hand to the bracket 16b and on the other hand to a solid foot of the base of the frame of the installation.
  • a guiding means for example, constituted by two vertical columns 29, fixed at their opposite extremities, on the one hand to the bracket 16b and on the other hand to a solid foot of the base of the frame of the installation.
  • the rollers 9-9 are coupled by a flexible member 30 advantageously constituted by a cable spring wound in a circulargroove constituting a pulley 31 at the rear portion of the rollers.
  • This arrangement permits braking the descent of the assembly of the support 28 and the rollers 9-9 at the time of liberation of the last winding from the supply or discharge reel.
  • the support 28 carries a bar or contact member 28a whose function will be explained later.
  • the axes of the upper fixed rollers 9a-9c preferably have an adjustable orientation.
  • the group of rollers disposed at the entrance of the filin handling apparatus and downstream of the projector comprises for example, four upper rollers l0a-10- b-10c-10d (FIG. 1) freely mounted for rotation on fixed axles carried by a bracket 16d fixed at the median part of the frame of the installation and three movable lower stretcher and compensator rollers l0-1010".
  • the installation is provided with means for braking the speed of winding of the take-up reel if the tension of the length of the band coming from the projector becomes too great.
  • Such means is controlled by the position of the stretcher and compensator rollers l0, 10', 10" disposed at the entrance of the film handling apparatus downstream of the projector.
  • one or more rollers 10, 10 and 10 are freely mounted for rotation at the extremity of a lever 24 (FIG. 19) of a braking apparatus for the film.
  • the lever 24 is pivotably connected at its opposite extremity on an axle 25 mounted in a vertical wall of the frame, as seen in FIG. 19.
  • a belt 27 is applied on a pulley fixed in rotation on the lower reel 2 and one extremity of the belt is secured to the wall of the frame and the other extremity to lever 24.
  • the belt permits the application of friction to the pulley 26 when the lever 24 is pivoted upwardly.
  • the ascending movement of the roller 10 corresponds to a pivoting movement of the lever 24 of the braking apparatus to apply a braking force on the pulley 26 to slow down the rotation of the lower reel 2.
  • This same apparatus provides for the application of a braking action on the upper reel when this becomes the take-up reel.
  • the length b, going to the projector is unwound from the lower reel which is now the supply reel, whereas the length b coming from the projector is wound on the upper reel 1.
  • a second length b unwinds from the lowerreel and is wound on the upper reel.
  • rollers -10-10 for the formation of the film loop b are carried by a pivoting lever which can act on a disconnecting apparatus for the drive means of each of the reels.
  • rollers l0-10-l0 are, for example, mounted at the extremity of a lever 32 pivotably connected to the frame of the installation, in proximity to the axle of the lower reel.
  • Such means is illustrated in FIGS. 16 to 18 and comprises for each of the reels, a pulley 33 mounted freely rotatable on the axle 14 of the reel and on which pulley a belt is wound coupled to the drive pulley of the motor for driving the reel.
  • a clutch plate 35 is fixed on the axle l4 and consequently the axle 14 is driven from the drive motor by the pressure of the pulley 33 on said clutch plate.
  • the cooperating faces of the pulley 33 and of the plate 35 are provided, in known manner, with a lining of any suitable type of frictional material.
  • the pressure of the pulley 33 against the plate 35 is obtained by means of a clutch member 36 comprising a socket 36a slidingly mounted on the shaft 14 and a plate 36b of U-shape in which is lodged an axially movable nut 37 fixed in rotation by the walls of plate 36b.
  • a ring 360 having a low coefficient of friction is advantageously interposed between the extremity of the socket 36a and the pulley 33.
  • the nut 37 is mounted on a screw 38 having a large pitch and axially fixed such that its rotation causes longitudinal movement of the nut.
  • the screws 38 and the axle 14 of the reels are, for example, rotatably mounted in a brace element 39 coupled to the vertical partition 16a of the frame of the installation, the brace element comprising a bearing 39a carrying the screw 38 and a bearing 39b for the axle l4.
  • Weak recall springs 40 are mounted on stems 41 and bear against an edge of the plate 36b and maintain the clutch member 36 in a position of equilibrium.
  • the plate member 36b slides on the shoulder of the element 39 carrying the bearings 39b.
  • the screw 38 is rigidly coupled to a lever 42 (lower reel) or 42' (upper reel) by being fixed at one of its extremities by a nut 43 on a carrier whose outer surface is smooth and rides in bearing 39a.
  • levers 42-42 are coupled to respective ends of an articulated connecting rod 44.
  • the lever 42 of the disengaging apparatus of the lower reel has a greater length than that of the lever 42' of the disengaging apparatus of the upper reel.
  • the free extremity of the lever 42 carries a laterally transported joint constituted by a roller 42a resting on lever 32. This roller is adapted to follow the lever 32 during ascending movements of lever 32.
  • the lever 32 can be advantageously freely articulated, on a shoulder constituted by the external surface of the bearing 39a.
  • rollers 9-9-9a9b-9c are disposed in a vertical plane situated at the rear of the vertical plane containing the rollers 10-10-ll0"1- 0a-10b-10c-10d.
  • the control of the drive motor (not shown in the drawings) of each of the reels and the pivoting movements of the feed arm 7 from a rest position to a feed position and vice versa is effected by the intermediary of a selector apparatus illustrated schematically in FIGS. 10 and 11.
  • the selector apparatus comprises an electric motor 45 which drives, via a reducer 46, a shaft 48 on which are mounted cams 49-50 cooperating with respective microswitches 51-52.
  • the carns 49 and 50 have an identical profile and an inverse disposition. They present on their peripheries, respective notches 49a-50a.
  • the means effecting the pivotal movement of the feed arm 7 from a rest position to a feed position and vice versa is constituted by a crank plate 53 secured on the shaft 48 and coupled, by the intermediary of a connecting rod 54 to the arm 7, preferably by means of a second crank plate 55 secured to the rear extremity of the shaft 8 of the feed arm.
  • the rod 54 is articulated at its opposite extremities on respective crank pins 53a and 55a on the crank plates 53 and 55.
  • a cam 56 is also secured on the shaft 48 and cooperates with a microswitch 57 to stop the motor 45 following the four positions A, B, C, D of the arm 7 as follows:

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US423976A 1972-12-12 1973-12-12 Endless film winding or unwinding device Expired - Lifetime US3923266A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3998398A (en) * 1975-11-19 1976-12-21 Didier Kressmann Apparatus winding endless bands of film on hubs of spools

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2368781A1 (fr) * 1976-10-22 1978-05-19 Lacoste Christian Dispositif pour le defilement sans interruption d'un element sans fin de grande longueur, notamment d'un film cinematographique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1308293A (en) * 1916-03-13 1919-07-01 Elisha E Maggard Motion-picture apparatus.
US3139240A (en) * 1962-06-26 1964-06-30 Howard Holmes Inc Winding apparatus for an endless web
US3592402A (en) * 1967-04-21 1971-07-13 Aga Ab Tape winding apparatus for recording and/or reproducing of information on an endless tape

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1308293A (en) * 1916-03-13 1919-07-01 Elisha E Maggard Motion-picture apparatus.
US3139240A (en) * 1962-06-26 1964-06-30 Howard Holmes Inc Winding apparatus for an endless web
US3592402A (en) * 1967-04-21 1971-07-13 Aga Ab Tape winding apparatus for recording and/or reproducing of information on an endless tape

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3998398A (en) * 1975-11-19 1976-12-21 Didier Kressmann Apparatus winding endless bands of film on hubs of spools

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