US3558077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Threading device for motion picture film or the like
Assignee: Agfa Gevaert AG
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Filing: 1968-08-22
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Granted: 1971-01-26
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Expires: 1988-08-22
Abstract
Abstract The housing of a motion picture projector defines a film path in which the film must advance toward the gate. The film is stored on a reel which is installed in a magazine and its leading end can be fully concealed in the interior of the magazine. The housing and the magazine accommodate portions of an automatic film threading device which causes the leading end of the film to enter the film path irrespective of the position of such leading end prior to threading. The threading device comprises a guide which is installed in the magazine to bear against the outermost convolution of convoluted film and can direct the leading end into the film path when the leading end is caused to assume a predetermined angular position with reference to the axis of the reel. A drive of the threading device can rotate the reel in a sense to pay out the film and to move the leading end to predetermined position in response to operation of the film transporting mechanism. This drive comprises an endless belt which is provided with external ribs adapted to engage and to entrain the leading end if the latter happens to be located between the belt and the guide when the threading operation is started. If the leading end is already located downstream of the belt, the reel is simply rotated until the leading end reaches the guide and is caused to enter the film path so as to move into the range of a driven member in the film transporting mechanism.
Inventors
- 👤 Hans Heinen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:00
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/56
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
150 words
In a cinematographic apparatus, particularly in a motion picture projector, a combination comprising a housing; a rotary reel carried by said housing and containing a supply of convoluted film having a leading end; confining means provided in said housing and defining a path wherein the film is conveyed lengthwise in response to unwinding of said supply from said reel, said confining means having an inlet at one end of said path; and threading means for introduction the leading end of said film into said inlet, comprising a drive for rotating said reel by way of said supply of convoluted film in a direction to unwind the film and to thereby place said leading into into a predetermined angular position with reference to the axis of said reel, said drive comprising an element operative to engage the outermost convolution of said supply and to thereby rotate the reel in said direction.
Claim 2
Dependent Claim
150 words
In a cinematographic apparatus, particularly in a motion picture projector, a combination comprising a housing; a rotary reel carried by said housing and containing a supply of convoluted film having a leading end; confining means provided in said housing and defining a path wherein the film is conveyed lengthwise in response to unwinding of said supply from said reel, said confining means having an inlet at one end of said path; and threading means for introduction the leading end of said film into said inlet, comprising a drive for rotating said reel by way of said supply of convoluted film in a direction to unwind the film and to thereby place said leading into into a predetermined angular position with reference to the axis of said reel, said drive comprising an element operative to engage the outermost convolution of said supply and to thereby rotate the reel in said direction.
Claim 3
Dependent Claim
19 words
A combination as defined in claim 1, wherein said element of said drive is an endless flexible element element.
Claim 4
Dependent Claim
15 words
A combination as defined in claim 2, wherein said flexible element consists of elastomeric material.
Claim 5
Dependent Claim
36 words
A combination as defined in claim 2, wherein sad said drive means further comprises at least one rotary mEmber, said flexible element being trained over said rotary member in the region where it engages said supply.
Claim 6
Dependent Claim
39 words
A combination as defined in claim 2, wherein said drive means further comprises a pair of pulleys having axes located in a common plane with the axis of said reel, a said flexible element being trained over said pulleys.
Claim 7
Dependent Claim
37 words
A combination as defined in claim 5, further comprising a support for said pulleys, said support being movable between first and second positions in which said flexible element respectively engages with and is disengaged from said supply.
Claim 8
Dependent Claim
61 words
A combination as defined in claim 6, further comprising a magazine accommodating said supply and said reel, a said housing having a first window and said magazine having a second window registering with said first window, said flexible element extending through said windows and into engagement with the supply of film in said magazine in the first position of said support.
Claim 9
Dependent Claim
40 words
A combination as defined in claim 7, further comprising mounting means detachably securing said magazine to said housing, said magazine having a mouth in registry with said inlet and said guide means being provide in the interior of said magazine.
Claim 10
Dependent Claim
20 words
A combination as defined in claim 6, wherein said support is pivotable about the axis of one of said pulleys.
Claim 11
Dependent Claim
19 words
A combination as defined in claim 6, further comprising means for biasing the support to a said first position.
Claim 12
Dependent Claim
233 words
In a cinematographic apparatus, particularly in a motion picture projector, a combination comprising a housing; a rotary reel carried by said housing and containing a supply of convoluted l film having a leading end; confining means provided in said housing and defining a path wherein the film is conveyed lengthwise in response to unwinding of said supply from said reel, said confining means having an inlet at one end of said path; film transporting means including a rotary sprocket having teeth extending into said path downstream of said inlet to engage and advance the leading end of said film when such leading end advances beyond said inlet; and threading means for introducing the leading end of said film into said inlet, comprising a drive for rotating said reel by way of said supply of convoluted film in a direction to unwind the film and to thereby place said leading end into a predetermined angular position with reference to the axis of said reel, and guide means for directing said leading end into said inlet in response to further rotation of the reel in said direction, said drive comprising an endless flexible element operative to engage the outermost convolution of said supply an to thereby rotate the reel in said direction, and means deriving motion from said film transporting means and arranged to move said flexible element at the peripheral speed of said sprocket.
Claim 13
Dependent Claim
233 words
In a cinematographic apparatus, particularly in a motion picture projector, a combination comprising a housing; a rotary reel carried by said housing and containing a supply of convoluted l film having a leading end; confining means provided in said housing and defining a path wherein the film is conveyed lengthwise in response to unwinding of said supply from said reel, said confining means having an inlet at one end of said path; film transporting means including a rotary sprocket having teeth extending into said path downstream of said inlet to engage and advance the leading end of said film when such leading end advances beyond said inlet; and threading means for introducing the leading end of said film into said inlet, comprising a drive for rotating said reel by way of said supply of convoluted film in a direction to unwind the film and to thereby place said leading end into a predetermined angular position with reference to the axis of said reel, and guide means for directing said leading end into said inlet in response to further rotation of the reel in said direction, said drive comprising an endless flexible element operative to engage the outermost convolution of said supply an to thereby rotate the reel in said direction, and means deriving motion from said film transporting means and arranged to move said flexible element at the peripheral speed of said sprocket.
Claim 14
Dependent Claim
266 words
In a cinematographic apparatus, particularly in a motion picture projector, a combination comprising a housing having a window; a rotary reel carried by said housing and containing a supply of convoluted film having a leading end and being outwardly adjacent to said window; confining means provided in said housing and defining a path for conveying the film lengthwise in response to unwinding of said supply from said reel, said confining means having an inlet at one end of said path; and threading means for introducing the leading end of said film into said inlet, comprising a drive for rotating said reel by way of said supply of convoluted film in a direction to unwind the film and to thereby place said leading end into a predetermined angular position with reference to the axis of said reel, and guide means for directing said leading end into said inlet in response to further rotation of the reel in said direction, said drive comprising a support provided in said housing, a pair of pulleys rotatably mounted on said support and having axes located in a common plane with the axis of said reel, and an endless flexible film-engaging element trainEd over said pulleys and arranged to by driven in a direction to unwind the film from said reel when such element engages the outermost convolution of said supply, said support being movable substantially radially of said reel to and from an operative position in which the support extends through said window and one of said pulleys maintains the flexible element in engagement with the outermost convolution of said supply.
Claim 15
Dependent Claim
266 words
In a cinematographic apparatus, particularly in a motion picture projector, a combination comprising a housing having a window; a rotary reel carried by said housing and containing a supply of convoluted film having a leading end and being outwardly adjacent to said window; confining means provided in said housing and defining a path for conveying the film lengthwise in response to unwinding of said supply from said reel, said confining means having an inlet at one end of said path; and threading means for introducing the leading end of said film into said inlet, comprising a drive for rotating said reel by way of said supply of convoluted film in a direction to unwind the film and to thereby place said leading end into a predetermined angular position with reference to the axis of said reel, and guide means for directing said leading end into said inlet in response to further rotation of the reel in said direction, said drive comprising a support provided in said housing, a pair of pulleys rotatably mounted on said support and having axes located in a common plane with the axis of said reel, and an endless flexible film-engaging element trainEd over said pulleys and arranged to by driven in a direction to unwind the film from said reel when such element engages the outermost convolution of said supply, said support being movable substantially radially of said reel to and from an operative position in which the support extends through said window and one of said pulleys maintains the flexible element in engagement with the outermost convolution of said supply.
References Cited (Backward Citations)
US3386675A
Cited
US3429518A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |