US3904145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for stepwise transport of webs in photographic copying machines or the like
Assignee: Agfa Gevaert AG
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Filing: 1973-05-25
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Granted: 1975-09-09
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Expires: 1993-05-25
Abstract
Abstract Apparatus for transporting webs of photosensitive material in a copying machine has a driven takeup reel which collects exposed material and intermittently driven advancing rolls which withdraw the material from a supply reel in stepwise fashion. A mechanical or electromagnetic friction brake is interposed between the advancing rolls and the takeup reel to abruptly interrupt the transport of material toward the takeup reel, either in response to completed transport of the material by a step or during transport of material by the advancing rolls. The mechanical brake employs an idler roll or a tensioning roll which changes its position in response to changing tension of the material. The electromagnetic brake has an armature which biases the material against a stationary back support in response to energization of the electromagnet which latter is energized when the motor for the takeup reel is idle of vice versa.
Inventors
- 👤 Siegfried Steinberger
- 👤 Erich Nagel
- 👤 Ernst Biedermann
- 👤 Mathias Pflugbeil
- 👤 Karl Dreher
- 👤 Adolf Fleck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:44
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/58; G03B27/587
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
248 words
Apparatus for tightly packing the convolutions of elongated web material, comprising a source of web material, said web material having a leader; rotary takeup means connected with said leader; means for rotating said takeup means in a direction to collect and convolute the web material on said takeup means; advancing means actuatable to transport the web material stepwise along a predetermined path extending from said source to said takeup means; a friction brake for braking the web material intermediate said advancing means and said takeup means in response to an interruption of actuation of said advancing means while said takeup means continues to rotate in said direction whereby said takeup means packs the convoluted web material as a result of further rotation of said takeup means in said direction upon application of said brake, said brake comprising first and second braking members disposed at the opposite sides of said path; means for looping the web material intermediate said advancing means and said brake during actuation of said advancing means; and means for applying said brake in response to a reduction of the length of looped web material as a result of collection of web material by said takeup means following an interruption of actuation of said advancing means, including a device for moving one of said braking members toward the other of said braking members to thereby bias the web material against said other braking member in response to said reduction of the length of looped web material.
Claim 2
Dependent Claim
248 words
Apparatus for tightly packing the convolutions of elongated web material, comprising a source of web material, said web material having a leader; rotary takeup means connected with said leader; means for rotating said takeup means in a direction to collect and convolute the web material on said takeup means; advancing means actuatable to transport the web material stepwise along a predetermined path extending from said source to said takeup means; a friction brake for braking the web material intermediate said advancing means and said takeup means in response to an interruption of actuation of said advancing means while said takeup means continues to rotate in said direction whereby said takeup means packs the convoluted web material as a result of further rotation of said takeup means in said direction upon application of said brake, said brake comprising first and second braking members disposed at the opposite sides of said path; means for looping the web material intermediate said advancing means and said brake during actuation of said advancing means; and means for applying said brake in response to a reduction of the length of looped web material as a result of collection of web material by said takeup means following an interruption of actuation of said advancing means, including a device for moving one of said braking members toward the other of said braking members to thereby bias the web material against said other braking member in response to said reduction of the length of looped web material.
Claim 3
Dependent Claim
41 words
Apparatus as defined in claim 1, wherein said first braking member has a surface with a high coefficient of friction which engages the web material at least in response to movement of said one braking member toward said other braking member.
Claim 4
Dependent Claim
25 words
Apparatus as defined in claim 2, wherein said other braking member is a fixed cylinder and said surface is the peripheral surface of said cylinder.
Claim 5
Dependent Claim
24 words
Apparatus as defined in claim 3 wherein the web material contacts the periphery of said cylinder along an arc of at least 60 degrees.
Claim 6
Dependent Claim
110 words
Apparatus as defined in claim 5, wherein said one braking member is an idler roll and said looping means comprises a second roll engaging the web material intermediate said idler roll and said advancing means and means for yieldably urging said second roll in direction to loop the web material about said second roll ahead of said idler roll and to simultaneously urge said idler roll away from said cylinder through the medium of said web material, said device comprising means for biasing said idler roll toward said cylinder with a force which suffices to apply said brake in response to said reduction of the length of looped web material.
Claim 7
Dependent Claim
82 words
Apparatus as defined in claim 1, wherein said looping means comprises a tensioning element engaging the web material intermediate said braking members and said advancing means, said tensioning element being movable by web material in a predetermined direction in response to rotation of said takeup means between successive actuations of said advancing means and said device comprising means for biasing said one braking membEr toward said other braking member in response to movement of said tensioning element in said last mentioned direction.
Claim 8
Dependent Claim
68 words
Apparatus as defined in claim 1, wherein said looping means comprises a magazine for the storage of a supply of web material intermediate said advancing means and said brake, said device including a scanning element for monitoring the quantity of the material in said supply and for producing signals in response to detection of a predetermined quantity, and means for applying said brake in response to said signals.
Claim 9
Dependent Claim
20 words
Apparatus as defined in claim 7, wherein said scanning element includes a photosensitive detector comprising a source of non-actinic light.
Claim 10
Dependent Claim
22 words
Apparatus as defined in claim 8, wherein said device comprises an electromagnet having a movable armature which constitutes said one braking member.
Claim 11
Dependent Claim
70 words
Apparatus as defined in claim 9, wherein said armature moves toward said other braking member in response to energization of said electromagnet and said means for rotating said takeup means comprises an electric motor, said device further comprising control means for alternately energizing said electromagnet and starting said motor so that said armature biases said web material against said other braking member while said motor is idle and vice versa.
Claim 12
Dependent Claim
72 words
Apparatus as defined in claim 6, wherein said looping means comprises a magazine for storage of a supply of web material intermediate said brake and said advancing means and said device further comprises a scanning element for monitoring the quantity of web material in said supply and for producing signals in response to detection of a predetermined minimum quantity, said control means being responsive to said signals to thereby energize said electromagnet.
Claim 13
Dependent Claim
72 words
Apparatus as defined in claim 3, wherein said looping means comprises a magazine for storage of a supply of web material intermediate said brake and said advancing means and said device further comprises a scanning element for monitoring the quantity of web material of said supply and for producing signals in response to detection of a predetermined maximum quantity, said control means being responsive to said signals to thereby deenergize said electromagnet.
Claim 14
Dependent Claim
13 words
Apparatus as defined in claim 10 wherein said control means comprises a flip-flop.
Claim 15
Dependent Claim
268 words
Apparatus for tightly packing the convolutions of elongated web material, comprising a source of web material, said web material having a leader; rotary takeup means connected with said leader; means for rotating said takeup means in a direction to collect and convolute the web material on said takeup means; advancing means actuatable to transport the web material stepwise along a predetermined path extending from said source to said takeup means; a friction brake for braking the web material intermediate said advancing means and said takeup means in response to an interruption of actuation of said advancing means while said takeup means continues to rotate in said direction whereby said takeup means packs the convoluted web material as a result of further rotation of said takeup means in said direction upon application of said brake, said brake comprising first and second braking members disposed at the opposite sides of said path, one of said braking members being movable toward and away from the other of said braking members to thereby bias the web material against said other braking member in response to movement of said one braking member toward said other braking member, the web material being trained over said one braking member; and means for looping the web material, including means for yieldably biasing said one braking member away from said other braking member, said one braking member being moved by the web material toward said other braking member in response to continued rotation of said takeup means following an interruption of actuation of said advancing means whereby the web material overcomes the resistance of said biasing means.
Claim 16
Dependent Claim
268 words
Apparatus for tightly packing the convolutions of elongated web material, comprising a source of web material, said web material having a leader; rotary takeup means connected with said leader; means for rotating said takeup means in a direction to collect and convolute the web material on said takeup means; advancing means actuatable to transport the web material stepwise along a predetermined path extending from said source to said takeup means; a friction brake for braking the web material intermediate said advancing means and said takeup means in response to an interruption of actuation of said advancing means while said takeup means continues to rotate in said direction whereby said takeup means packs the convoluted web material as a result of further rotation of said takeup means in said direction upon application of said brake, said brake comprising first and second braking members disposed at the opposite sides of said path, one of said braking members being movable toward and away from the other of said braking members to thereby bias the web material against said other braking member in response to movement of said one braking member toward said other braking member, the web material being trained over said one braking member; and means for looping the web material, including means for yieldably biasing said one braking member away from said other braking member, said one braking member being moved by the web material toward said other braking member in response to continued rotation of said takeup means following an interruption of actuation of said advancing means whereby the web material overcomes the resistance of said biasing means.
Claim 17
Dependent Claim
41 words
Apparatus as Defined in claim 14, wherein said first braking member has a surface with a high coefficient of friction which engages the web material at least in response to movement of said one braking member toward said other braking member.
Claim 18
Dependent Claim
25 words
Apparatus as defined in claim 15, wherein said other braking member is a fixed cylinder and said surface is the peripheral surface of said cylinder.
Claim 19
Dependent Claim
15 words
Apparatus as defined in claim 16, wherein said one braking member is an idler roll.
Claim 20
Dependent Claim
20 words
Apparatus as defined in claim 15, wherein the web material contacts said cylinder along an arc of at least 60*.
Claim 21
Dependent Claim
187 words
Apparatus as defined in claim 14, wherein said other braking member is a cylinder and said one braking member is a roll, said looping means further comprising a lever pivotable about a predetermined axis and supporting said roll, said biasing means being arranged to pivot said lever in a first dirction to move said roll away from said cylinder and said lever pivoting in a second direction to move said roll toward said cylinder when the tension of web material increases as a result of rotation of said takeup means following an interruption of actutation of said advancing means, the axes of said cylinder and said roll being parallel to said predetermined axis and the axis of said roll approaching the line which connects the axis of said cylinder with said predetermined axis when said lever is pivoted against the opposition of said biasing means so that said roll presses the web material against said cylinder with a substantial force as soon as the roll moves sufficiently close to said cylinder to bear against a portion of web material which is simultaneously in contact with said cylinder.
Claim 22
Dependent Claim
47 words
Apparatus as defined in claim 14, further comprising a roller located between said brake and said takeup means, the web material being trained over said roller and contacting said other braking member only in response to movement of said one braking member toward said other braking member.
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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |