Patent US3561655A successfully refreshed from Google Patents.
US3561655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Movie film feed control device
Assignee: Sankyo Kogaku Kogyo Co Ltd
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Filing: 1969-05-15
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Granted: 1971-02-09
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Expires: 1989-05-15
Abstract
Abstract A movie film feed control device comprising a friction wheel positioned between a light transmitting window for projection or picture taking and a film supply reel, means for yieldably pressing against the inner side of a loop of film formed between said friction wheel and said light transmitting window, and a contact member positioned between said yieldable pressing means and said friction wheel and adapted to be contacted by the film. The device permits to correct the shape of the loop of film and feed the film accurately at all times by varying the force with which the film presses against the friction wheel by the interaction of said yieldable pressing means and said contact member.
Inventors
- 👤 Yukio Yasukawa
- 👤 Yasuyuki Nakahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:06
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/42
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
301 words
A device for use in movie projectors and movie cameras which comprises a film supply reel and a film gate wherein the device feeds movie film between the supply reel and the film gate without using a sprocket wheel for engaging the perforations in the film and feeding the film, wherein the improvement comprises a film feed friction wheel positioned between said supply reel and said film gate, film guide means positioned between said friction wheel and said gate and defining a space therebetween, said film guide means comprising a wall having an arcuate surface within said space for forming a loop of film as the film passes through said space between said friction wheel and film gate so that by means of the loop intermittent motion can be imparted to the film without resistance to such motion, wall means forming in combination with said friction wheel a film passage around a portion of the circumferential periphery of said friction wheel and said film passage opening at one end to said space and the other end arranged for receiving film unwound from said supply reel for guiding the film over a portion of the circumferential periphery of said friction wheel, a resilient member located within said space and spaced from said arcuate surface therein for contacting the film when the loop of film in said space is reduced in size and recedes from said arcuate surface and thereby tensioning the film in said film passage and pressing it against the circumferential periphery of said friction wheel and when the loop of film in said space is increased and contacts said arcuate surface the film in said film passage is released from engagement with the circumferenTial periphery of said friction wheel for maintaining the proper size of the loop within said space.
Claim 2
Independent Claim
301 words
A device for use in movie projectors and movie cameras which comprises a film supply reel and a film gate wherein the device feeds movie film between the supply reel and the film gate without using a sprocket wheel for engaging the perforations in the film and feeding the film, wherein the improvement comprises a film feed friction wheel positioned between said supply reel and said film gate, film guide means positioned between said friction wheel and said gate and defining a space therebetween, said film guide means comprising a wall having an arcuate surface within said space for forming a loop of film as the film passes through said space between said friction wheel and film gate so that by means of the loop intermittent motion can be imparted to the film without resistance to such motion, wall means forming in combination with said friction wheel a film passage around a portion of the circumferential periphery of said friction wheel and said film passage opening at one end to said space and the other end arranged for receiving film unwound from said supply reel for guiding the film over a portion of the circumferential periphery of said friction wheel, a resilient member located within said space and spaced from said arcuate surface therein for contacting the film when the loop of film in said space is reduced in size and recedes from said arcuate surface and thereby tensioning the film in said film passage and pressing it against the circumferential periphery of said friction wheel and when the loop of film in said space is increased and contacts said arcuate surface the film in said film passage is released from engagement with the circumferenTial periphery of said friction wheel for maintaining the proper size of the loop within said space.
Claim 3
Dependent Claim
58 words
A device, as set forth in claim 1, wherein means are arranged for rotating said friction wheel at a peripheral speed slightly higher than the average rate of the intermittent movement of the film passing through said film gate for restoring the film loop to its normal size as soon as the film loop is reduced in size.
Claim 4
Dependent Claim
90 words
A device, as set forth in claim 2, wherein said means for rotating said friction wheel comprising a shaft secured to and extending axially from said friction wheel, a drive wheel rotatably mounted on said shaft at a position spaced from said friction wheel, and a clutch mounted on said shaft for rotating said shaft and said friction wheel when the film is passed from said film passage to said space and for disconnecting said drive wheel from said shaft when said drive wheel is rotated in the opposite direction.
Claim 5
Dependent Claim
204 words
A device, as set forth in claim 3, wherein said clutch comprising a pawl plate having an elongated slot formed therein, a section formed on said shaft and arranged to receive said pawl plate so that said pawl plate is movable on said section only in a direction normal to the axis of said shaft, a pair of pawl surfaces extending outwardly from the periphery of said pawl plate, said drive wheel mounted on said shaft adjacent said pawl plate, said drive wheel having projections thereon extending laterally from said drive wheel into the path of said pawl plate, whereby when said drive wheel rotates in the direction of normal feed of the film from said friction wheel to said film gate the projections on said drive wheel engage the pawl surfaces on said pawl plate causing said pawl plate and said shaft to rotate and when said drive wheel rotates in the opposite direction said projections ride on the periphery of said pawl plate without engaging said pawl surfaces and causing said pawl plate to be displaced normally to the axis of said shaft on said shaft so that the rotational movement of said drive wheel is not transmitted to said friction wheel.
Claim 6
Dependent Claim
58 words
A device, as set forth in claim 1, wherein said friction wheel has a pair of spaced surfaces each extending about one of the circumferential edges of said friction wheel and disposed radially outwardly from the surface of said wheel between said edge surfaces, and the outer surface of said edge surfaces being coated with a friction material.
Claim 7
Dependent Claim
95 words
A device, as set forth in claim 1, wherein a pressure roller having an axis disposed in parallel relationship with the axis of said friction wheel located at the entrance to said film passage around said friction wheel, said pressure roller pivotally mounted relative to the circumferential periphery of said friction wheel so said pressure roller can be selectively urged against said friction wheel and when the film loop in said space increases in size and contacts the arcuate surface therein the force of the film displaces said pressure roller away from said friction wheel.
Claim 8
Dependent Claim
50 words
A device, as set forth in claim 6, wherein said wall means forming the film passage comprising a rotatably mounted supporting plate, said pressure roller rotatably mounted on said supporting plate, and said supporting plate being arranged for varying the force for urging said pressure roller against said friction wheel.
Claim 9
Independent Claim
393 words
A device, for use in movie projectors and movie cameras which comprises a film supply reel and a film gate wherein the device feeds movie film between the supply reel and the film gate without using a sprocket wheel for engaging perforations in the film for feeding the film, wherein the improvement comprises a film feed friction wheel positioned between said supply reel and said film gate, film guide means positioned between said friction wheel and film gate and defining a space therebetween, said film guide means comprising a wall having an arcuate surface within said space for forming a loop of film as the film passes through said space between said frIction wheel and film gate so that intermittent motion can be imparted to the film without resistance to such motion, all means forming a film passage around a portion of the circumferential periphery of said friction wheel an opening at one end of the passage to said space and at the other end for receiving film unwound from said supply reel for guiding the film over a portion of the circumferential periphery of said friction wheel, a resilient member located within said space and spaced from said arcuate surface therein for contacting the film when the loop of film in said space is reduced in size and recedes from said arcuate surface, means for rotating said friction wheel in a direction for feeding film from said supply reel to said film gate so that the peripheral speed of said friction wheel is slightly higher than the average rate of intermittent movement of the film passing through said film gate, and means for regulating the rotation of said friction wheel for passing the film from said film gate to said supply reel so that the peripheral speed of said friction wheel is maintained slightly lower than average rate of intermittent movement of the film passing through said film gate toward said supply reel, whereby when the loop of film in said space is reduced in size and recedes away from said arcuate surface the film in said film passage presses against the circumferential periphery of said friction wheel and when the loop of film in said space is increased in contact said arcuate surface the film in said film passage is released from engagement with the circumferential periphery of said friction wheel.
Claim 10
Independent Claim
393 words
A device, for use in movie projectors and movie cameras which comprises a film supply reel and a film gate wherein the device feeds movie film between the supply reel and the film gate without using a sprocket wheel for engaging perforations in the film for feeding the film, wherein the improvement comprises a film feed friction wheel positioned between said supply reel and said film gate, film guide means positioned between said friction wheel and film gate and defining a space therebetween, said film guide means comprising a wall having an arcuate surface within said space for forming a loop of film as the film passes through said space between said frIction wheel and film gate so that intermittent motion can be imparted to the film without resistance to such motion, all means forming a film passage around a portion of the circumferential periphery of said friction wheel an opening at one end of the passage to said space and at the other end for receiving film unwound from said supply reel for guiding the film over a portion of the circumferential periphery of said friction wheel, a resilient member located within said space and spaced from said arcuate surface therein for contacting the film when the loop of film in said space is reduced in size and recedes from said arcuate surface, means for rotating said friction wheel in a direction for feeding film from said supply reel to said film gate so that the peripheral speed of said friction wheel is slightly higher than the average rate of intermittent movement of the film passing through said film gate, and means for regulating the rotation of said friction wheel for passing the film from said film gate to said supply reel so that the peripheral speed of said friction wheel is maintained slightly lower than average rate of intermittent movement of the film passing through said film gate toward said supply reel, whereby when the loop of film in said space is reduced in size and recedes away from said arcuate surface the film in said film passage presses against the circumferential periphery of said friction wheel and when the loop of film in said space is increased in contact said arcuate surface the film in said film passage is released from engagement with the circumferential periphery of said friction wheel.
Claim 11
Dependent Claim
170 words
A device, as set forth in claim 8, wherein a drive shaft securely fixed to and extending axially from said friction wheel, pawl means mounted on said shaft and spaced from said friction wheel, a first drive wheel and a second drive wheel mounted adjacent the end of said shaft and arranged to engage said pawl means when said first and second drive wheels are rotated, and means for rotating said first and second drive wheels, whereby when the film is to be fed in the normal direction from said supply reel to said film gate said first drive wheel drives said shaft through said pawl means, and when the direction of the film feed is reversed said second drive wheel through said pawl means acts as a brake on said shaft for regulating the rotational speed of said friction wheel so that it is slightly lower than the average rate of intermittent movement of the film passing through said film passage from said film gate to said supply reel.
Claim 12
Dependent Claim
63 words
A device, as set forth in claim 9, wherein said first drive wheel has a smaller diameter than said second drive wheel and said means for rotating said first and second drive wheels comprises shutter shaft means and gear means in meshed engagement with said shutter shaft means and said first and second drive wheels for driving said first and second drive wheels.
References Cited (Backward Citations)
US2345656A
Cited
US3225989A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |