Classifications

• • 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
  • G03B21/43—Driving mechanisms
  • G03B21/44—Mechanisms transmitting motion to film-strip feed; Mechanical linking of shutter and intermittent feed
• • 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
  • G03B1/00—Film strip handling
  • G03B1/56—Threading; Loop forming
  • G03B1/58—Threading; Loop forming automatic

Definitions

• the invention relates to a film transport device of the type specified in the preamble of claim 1.
• DE-Al-31 27 778 describes a device for transporting and guiding a film in a film projector. knows, which has stationary on both sides of the image window arranged unwind and reel plates, each of which a drivable toothed roller is assigned.
• the two toothed rollers, a loop-forming device and a film pressure skid are arranged on a movable slide which can be moved on system-fixed rails parallel to the optical axis of the lens of the film projector between a freely accessible forward and rewind position and a presentation position.
• the film pressure skid is shifted against a film application rail opening / freezing the image window, the loop-forming device automatically forming a loop between the on-toothed roller and the film application rail and between the film application rail and the unwinding sprocket.
• the loop-forming device automatically forming a loop between the on-toothed roller and the film application rail and between the film application rail and the unwinding sprocket.
• a film transport device for a film camera which has two separate toothed drums for unwinding the unexposed film and for winding the exposed film onto a film take-up reel.
• Coupling devices for influencing the rotation of the toothed drums are provided between the drive system for the separate toothed drums and the toothed drums. Due to the continuous film transport through the toothed drums and the intermittent film transport in the area of the picture window, film loops must be provided before and after the picture window. which are formed by a relative rotation of the one film transport sprocket relative to the other film transport sprocket.
• the invention is based on the object of providing a film transport device which ensures only a short period of time for the full operational readiness of the projector and enables simple and quick start-up and loading and unloading of a film and also creates the conditions for this, that even partially unwound film spools can be removed from the film projector.
• the solution according to the invention creates a film transport device which enables simple and convenient operation of the projector during commissioning and when inserting and removing the film.
• To load the film all that is necessary is to place the film spool on an empty winding plate, insert the film into the wide-open film channel and fix the film end to the opposite empty core by means of a few turns.
• All further steps such as closing the film channel and forming loops, take place automatically within one to two seconds until fully operational.
• the film channel is opened again at the push of a button and the film can simply be removed without the risk of damage to the film.
• Figure 1 is a schematic perspective view of the film channel with the individual drive parts
• Figures 2 to 4 is a plan view of the film projector in various phases of film loop formation
• FIG. 5 shows a simplified block diagram of the automatic delivery control circuit.
• View of the essential drive parts of the film projector according to the invention shows the film transport device 2, the pre-winding and rewinding devices 3, 4, that of a common drive device 5 are driven, the winding and unwinding devices 6, 7 carrying the film reels and, in a simplified schematic perspective representation, the film loop channels 90, 100 used to hold the film loops on both sides of the image window 8.
• the film transport device 2 contains a main motor 21, which consists of a highly dynamic DC servo motor, which transmits its rotary movement to the film 1 via a directly driven film transport sprocket 22.
• the main motor 21 is fixedly connected via a shaft 23 to an angle encoder disk 24 of a sensor 26, which detects and transmits the exact position of the main motor 21 by means of an opto-electronic position sensing device 25.
• the pre-winding and post-winding devices 3, 4 contain a drive shaft 31, 41, which are firmly connected to a sprocket 32, 42 and continuously transport the inserted film.
• the drive shafts 31, 41 are connected via belts 56, 57 to drive rollers 52 of the drive device 5, which are rigidly coupled via a shaft to a drive motor 51, which consists of a regulated DC motor, the speed of which is proportional to the set frame rate is regulated.
• An angle encoder disk 53 which is fixedly connected to the motor shaft and which forms a sensor 55 together with an optoelectronic scanning device 54, is used to record the speed and direction of rotation of the drive motor 51.
• the winding and unwinding devices 6, 7 for receiving the film reels contain a winding plate 62, 72, which are each connected via a shaft to a winding motor 61, 71, which is designed as a DC motor.
• An angle encoder disk 63, 73 which is fixedly connected to the shaft of the respective winding motor 61, 71 and which, together with an optoelectronic scanning device 64, 74, forms a sensor device 65, 75, serves to record the speed and direction of rotation of the winding motors 61, 71.
• the film loop channels 90, 100 serve to receive the film loops formed on both sides of the picture window 8, in the present case only one loop measuring device 11 being arranged in the one on the left of the picture window 8 due to the special design of the control and regulating device Film loop channel 90 is provided.
• the loop measuring device 11 can consist of a reflection light barrier or a light-emitting diode in connection with an opposite phototransistor.
• An infeed carriage 19 mounted in corresponding guides is driven by an infeed motor 18 and carries the imaging optics, the film transport device 2 including a film stage with a film pressure plate, the winding or unwinding toothed rollers 32, 42, the swivel skid 33 and the drive device 5.
• FIG. 2 shows a top view of the film projector in a first phase of film loop formation.
• the winding plates 62, 72 serve to receive the film spools, the film optionally being from the left winding plate 62 unwound and can be moved through the film channel described below to the right winding plate 72 or vice versa.
• the film 1 can also be placed on the winding plates 62, 72 in any desired manner, which is indicated in FIG. 2 by the different film webs.
• the left winding plate 62 is followed by two deflection pins -34, 35, which guide the film 1 between the toothed rollers 32 of the one toothed roller 32 and a swivel head 33.
• two deflection pins 44, 45 are arranged in the vicinity of the right winding plate 72, which guide the film between the toothed roller 42 of the other pre-winding or post-winding device 4 and a pressing skid 43.
• the swivel runner 33 and the pressure runner 43 have inner surfaces which are adapted in their curvature to the diameter of the toothed rollers 32, -42, so that the film 1 lies tightly against the respective toothed roller 32, 42 in the clamped state.
• the image window 8 and the film transport device 2 with the film transport toothed roller 22 are arranged between the toothed rollers 32, 42.
• the image window 8 is part of a film guide rail 80 which has a curved film runner 81 in the region of the film transport sprocket 22, the curvature of which is also adapted to the diameter of the film transport sprocket 22.
• a pressing platform 85 which is resiliently mounted in a film stage, engages between the teeth of the film transport sprocket 22 and lies closely on the film channel when it is closed
• Film 1 and press it against the film guide 80, so that the film runs past the image window 8 without lateral deflections and a closed transition to the film transport sprocket 22 is ensured.
• a left film loop channel 90 is provided between the left toothed roller 32 and the image window 8 and is formed by parallel channel walls 91, 92.
• a right film loop channel 100 is formed, which is formed by two parallel channel walls 101, 102 which bear against the film transport sprocket 22 or the right sprocket 42.
• the film transport device 2 the film pressure plate 85, the pre-winding and rewinding devices 3, 4 and the film loop channel walls 101, 102 are arranged together with the imaging optics 13 on an infeed carriage 19 which, in the direction of the arrow, is shown by the arrow in FIG - Set feed motor 18 is moved to close the film channel.
• the feed carriage 19 is retracted so that the film channel is exposed and the film transport device 2 or the film transport sprocket 22 and the pre-winding and rewinding devices 3, 4 are retracted.
• a button "film channel OPEN / CLOSE" is pressed on the operating keyboard and then first the feed motor 18 is started, which drives the feed carriage 19 in the direction of the arrow via its drive. Shortly before the end position of the feed carriage 19 is reached, the loop construction begins.
• FIG. 3 illustrates the loop structure in a first phase and shows the film transport sprocket 22 lying against the film runner 81 and the sprocket 42 lying against the pressure runner 43.
• the toothed roller 22 of the film transport device 2 is brought into film engagement, while the film runs freely between the left-hand pre-or post-winding toothed roller 32 and the swivel runner 33, both of which were moved by the feed carriage 19 in the direction of the left, fixedly arranged film loop channel 9.
• the film transport device 2 is operated at a speed which is greater than that of the right pre and post winding spool 42 or the film transport device 2 rotates clockwise while the right pre or post spool 42 stands still. In this way, a certain film length is drawn off from the left winding plate 62 and a double loop length is drawn into the right film loop channel 100 to the right. Then, according to FIG. 4, the left pre-winding or post-winding sprocket 32 located on the left-most left film loop channel 90 is brought into film engagement by the swivel skid 33 engaging the left front or post-winding sprocket 32.
• the film projector generates a still image and is fully operational for all film projection and film transport functions.
• the film channel can be mechanically closed with the infeed movement, which additionally dampens any transport noise that may still be present.
• Figure 5 shows a simplified block diagram of the control and regulating device for the film transport parts.
• the higher-level control, regulating and monitoring system 15 is connected to an input keyboard 16 for entering desired film projector functions such as image transport with variable transport speed, search run, fast forward and backward run as well as "film channel OPEN / CLOSE" or the like . It preferably has a microprocessor which is connected to a memory for storing any functions of the film projector.
• the higher-level control, regulating and monitoring system 15 is connected on the output side to the electronic control and regulating devices 20, 50, 60, 70, 85 for the individual drive parts of the film projector.
• the outputs of the electronic control and regulating devices 20, 50, 60, 70 ,. 85 are via DC power amplifiers 200, 500, 600, 700, 86 with the main motor 21 of the film transport device 2, the drive motor 51 of the drive device 5 and the left winding motor 61 and right winding motor 71 of the two winding devices 6, 7 and the feed motor 18 connected.
• the sensors 26, 55, 65, 75 of the individual drive parts coupled to the motor shafts give corresponding position, speed and / or direction signals to the inputs of the assigned control and regulating devices 20, 50 and the higher-level control, regulating and Monitoring system 15.
• the outputs of the direct current power amplifiers 600, 700 are connected to an input of the associated control and regulating device 60, 70.
• the signal emitted by the loop measuring device 11 is applied to an input of the control, regulating and monitoring system 15 and to inputs of the control and regulating device 20 of the film transport device 2 and the control and regulating device 50 of the drive device 5.
• the main motor 21 preferably conveys a double film loop into the right film loop channel 100 when the drive motor 51 is at a standstill, this length being carried out by counting the pulses emitted by the scanning device, ie the corresponding rotation angle steps of the main motor 21 .
• part of the double loop length in the right film loop channel 100 is conveyed by correspondingly counting the pulses in the left film loop channel 90 with the drive motor 51 preferably stationary and the main motor 21 rotating in the opposite direction, so that in both film loop channels 90, 100 film loops of approximately the same length are conveyed are present at the end of the film loop construction.
• the embodiment of the invention is not limited to the preferred exemplary embodiment specified above. Rather, a number of variants are conceivable which make use of the solution shown, even in the case of fundamentally different types.
• the implementation is not limited to implementation with discrete logic modules, but is preferably implemented with programmed logic using a microprocessor.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Projection-Type Copiers In General (AREA)
• Advancing Webs (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6349422

Family Applications (1)

Country Status (5)

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• 1988
  • 1988-03-11 DE DE3808045A patent/DE3808045C1/de not_active Expired
• 1989
  • 1989-03-09 JP JP1502838A patent/JPH04501009A/ja active Pending
  • 1989-03-09 US US07/576,402 patent/US5121982A/en not_active Expired - Lifetime
  • 1989-03-09 EP EP89903103A patent/EP0406260A1/de not_active Ceased
  • 1989-03-09 WO PCT/DE1989/000157 patent/WO1989008866A1/de not_active Application Discontinuation

Non-Patent Citations (1)

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