US3630468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film handling apparatus
Assignee: Kalvar Corp
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Filing: 1970-07-27
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Granted: 1971-12-28
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Expires: 1990-07-27
Abstract
Abstract A sensing switch, when opened, provides a signal to stop the film threading operation and when closed provides a signal to unlatch a supply reel. A single-pole, single-throw switch is mounted adjacent a takeup reel and is opened by the forced motion of a movable flange on the takeup reel, such forced motion resulting from a film leader, whose width is larger than the biased dimension between the movable flange and a fixed flange being driven between them by a drive-out roller. Opening the switch causes a solenoid to be deenergized which allows the drive-out roller to move away from the leader. When the leader is removed from the takeup reel because of a rewind operation, the switch is closed, activating a solenoid which removes a latch from a plate upon which the supply reel is mounted, permitting the reel to be removed.
Inventors
- 👤 William K Christoffersen
- 👤 James L Keely
- 👤 William T Owens Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:53
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/56
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
257 words
In a machine having a supply reel wound with a filmstrip, a leader attached to the free end of the filmstrip, a takeup reel wherein the takeup reel has a hub and a pair of parallel flanges at least one of which is axially movable, means defining a minimum spacing between the flanges which is less than the width of the leader, biasing means urging the movable flange to a position of minimum spacing, first means for rotating the takeup reel in a forward direction, second means for rotating the supply reel in a rewind direction, a predetermined path for the filmstrip and the leader to traverse between the reels and means for driving the leader over the predetermined path to the takeup reel, the movable flange being moved axially against the biasing means to permit entry of the leader between the flanges, and to exert a frictional force on the edges of the leader so that it is propelled toward the hub when the first rotating means causes the takeup reel to rotate in the forward direction thereby causing the filmstrip to be wound on the takeup reel, the improvement comprising: a. sensing means, actuated by the axial movement of the movable flange against the biasing means, b. first disengaging means for disengaging the driving means, the first disengaging means being responsive to the sensing means and c. first connecting means connecting the sensing means to the first disengaging means so that when the sensing means is actuated the first disengaging means disengages the driving means.
Claim 2
Dependent Claim
257 words
In a machine having a supply reel wound with a filmstrip, a leader attached to the free end of the filmstrip, a takeup reel wherein the takeup reel has a hub and a pair of parallel flanges at least one of which is axially movable, means defining a minimum spacing between the flanges which is less than the width of the leader, biasing means urging the movable flange to a position of minimum spacing, first means for rotating the takeup reel in a forward direction, second means for rotating the supply reel in a rewind direction, a predetermined path for the filmstrip and the leader to traverse between the reels and means for driving the leader over the predetermined path to the takeup reel, the movable flange being moved axially against the biasing means to permit entry of the leader between the flanges, and to exert a frictional force on the edges of the leader so that it is propelled toward the hub when the first rotating means causes the takeup reel to rotate in the forward direction thereby causing the filmstrip to be wound on the takeup reel, the improvement comprising: a. sensing means, actuated by the axial movement of the movable flange against the biasing means, b. first disengaging means for disengaging the driving means, the first disengaging means being responsive to the sensing means and c. first connecting means connecting the sensing means to the first disengaging means so that when the sensing means is actuated the first disengaging means disengages the driving means.
Claim 3
Dependent Claim
34 words
The improvement of claim 1 wherein the surface of the movable flange facing the other flange is tapered outwarDly to the edge of the movable flange to permit a smooth entry of the leader.
Claim 4
Dependent Claim
63 words
The improvement of claim 1 wherein the sensing means includes a single-pole, single-throw switch, the first connecting means includes an electrical conductor, and the first disengaging means includes a solenoid whose movable member is attached to the driving means, permitting the driving means to move away from the tape when the switch is actuated, and whose coil is connected to the electrical conductor.
Claim 5
Dependent Claim
131 words
The improvement of claim 1 further comprising: a. a mounting plate upon which the supply reel is rotatably mounted, the mounting plate having an aperture, b. latching means engaging the mounting plate through the aperture to firmly hold the mounting plate, c. second disengaging means movably attached to the latching means for disengaging the latching means, the second disengaging means responsive to the sensing means when the sensing means is actuated in the opposite direction, and d. second connecting means connecting the sensing means to the second engaging means so that when the supply reel is rotated in the rewind direction by the second rotation means, withdrawing the leader from the takeup reel and returning the sensing means to its oppositely actuated state, the second disengaging means disengages the latching means.
Claim 6
Dependent Claim
34 words
The improvement of claim 4 wherein the surface of the movable flange facing the other flange is tapered outwardly to the edge of the movable flange to permit a smooth entry of the leader.
Claim 7
Dependent Claim
77 words
The improvement of claim 4 wherein the latching means includes a lever, pivotally mounted, one end of which is biased toward an edge of the mounting plate surrounding the aperture, the second disengaging means includes a solenoid whose movable member is movably linked to the other end of the lever causing the biased end of the lever to move away from the edge when the solenoid is actuated, and the second connecting means includes an electrical conductor.
Claim 8
Dependent Claim
34 words
The improvement of claim 6 wherein the surface of the movable flange facing the other flange is tapered outwardly to the edge of the movable flange to permit a smooth entry of the leader.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |