Patent US3857312A successfully refreshed from Google Patents.
US3857312A
Expired / Lapsed
US
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Low drag variable demand strip feed
Assignee: Cx Corp
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Filing: 1973-09-07
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Granted: 1974-12-31
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Expires: 1993-09-07
Abstract
Abstract Variable feed rate demand of a strip material receiving or utilization device is accommodated at low drag by drawing strip material from one side of a running slack loop thereof which is formed between a guide and an opposing continuously rotated frictional feed roll. Frictional driving contact of the opposite side of the running slack loop with the feed roll is established or increased when the receiving device pulls strip material from the loop, thereby shortening the loop and by the resultant resilient reaction of the loop material pressing the loop side against the feed roll and causing feed roll to draw additional material from the supply reel or other source, overcoming the effects thereof in terms of inertia, momentum and friction.
Inventors
- 👤 P Carlstedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:04
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/58; G03B27/587; G03B27/588; B; B65; B65H; B65H20/00; B65H20/02; B65H20/24; G03B21/00; G03B21/14; G03B21/32; G03B21/43; Y; Y10; Y10T; Y10T83/00; Y10T83/444; Y10T83/4529; Y10T83/647; Y10T83/6475; Y10T83/6579
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
289 words
Apparatus wherein strip material of resilient stiffness is supplied and received by progressive endwise movement of the strip, comprising supply means from which strip material may be forcibly drawn, strip receiving means operable to draw strip material to it at variable rate but operable with a drawing force below that required to draw the strip material from the supply means at such variable rate, and strip feed means acting on the strip material intermediate said supply and receiving means comprising a substantially constantly rotated first element having a peripheral portion frictionally engageable with one face of the sheet strip and by such engagement operable to draw sheet strip material forcibly from the supply means, and a second element stationed adjacent to the first element across a gap to permit forming a running slack loop of the strip with the sides of such loop passing between such elements and the width of the base of such loop exceeding the width of the gap, the first and second elements being so positionally related that incidence of the strip from the supply means to a first side of the loop requires deflection of the strip partially around the peripheral portion of the first element, and departure of the strip from the opposite side of the loop toward the receiving means moves it across the second element, whereby drawing of the strip from said opposite side of the loop toward the receiving means shortens the loop and as a result of such shortening together with the resilient stiffness of the loop forces the first side thereof into frictional engagement with the peripheral portion of the first element so as to draw more strip material from the supply means and thereby relengthen the loop.
Claim 2
Dependent Claim
289 words
Apparatus wherein strip material of resilient stiffness is supplied and received by progressive endwise movement of the strip, comprising supply means from which strip material may be forcibly drawn, strip receiving means operable to draw strip material to it at variable rate but operable with a drawing force below that required to draw the strip material from the supply means at such variable rate, and strip feed means acting on the strip material intermediate said supply and receiving means comprising a substantially constantly rotated first element having a peripheral portion frictionally engageable with one face of the sheet strip and by such engagement operable to draw sheet strip material forcibly from the supply means, and a second element stationed adjacent to the first element across a gap to permit forming a running slack loop of the strip with the sides of such loop passing between such elements and the width of the base of such loop exceeding the width of the gap, the first and second elements being so positionally related that incidence of the strip from the supply means to a first side of the loop requires deflection of the strip partially around the peripheral portion of the first element, and departure of the strip from the opposite side of the loop toward the receiving means moves it across the second element, whereby drawing of the strip from said opposite side of the loop toward the receiving means shortens the loop and as a result of such shortening together with the resilient stiffness of the loop forces the first side thereof into frictional engagement with the peripheral portion of the first element so as to draw more strip material from the supply means and thereby relengthen the loop.
Claim 3
Dependent Claim
29 words
The apparatus defined in claim 1 wherein the second element comprises a strip supporting guide table upon which rests said opposite side of the loop in generally horizontal position.
Claim 4
Dependent Claim
25 words
The appartus defined in Claim 2, wherein the first element comprises a power driven roller having a generally cylindrical peripheral portion with frictional means thereon.
Claim 5
Dependent Claim
48 words
The apparatus defined in claim 2, wherein the receiving means comprises a photoprint strip cutter mechanism generally aligned with said guide table and operable to draw strip material in successive intermittent movements, and the supply means comprises a rolled strip rotational support mounted generally above said guide table.
Claim 6
Dependent Claim
199 words
In strip feed apparatus, in combination with supply means to carry and deliver strip material having resilient stiffness and indefinite length, a first feed means operable to draw the strip material at variable rate, a second feed means preceding the first feed means and operable to draw strip material from the supply means in response to drawing of strip material by the first feed means, said second feed means forming a running slack loop of the strip material one side of which extends to the first feed means to be drawn freely thereby and the other side of which extends to the supply means, said second feed means comprising an independently driven rotative element and an opposing strip guide element so positionally related to the rotative element as to capture and hold said loop with the sides of the loop passing between the elements and the base of the loop maintained by its resilient stiffness wider than the spacing between said elements, the rotative element being frictionally engageable with the strip in reactive response to shortening of the loop by the first feed means so as to thereby draw strip material from the supply means to relengthen the loop.
Claim 7
Dependent Claim
199 words
In strip feed apparatus, in combination with supply means to carry and deliver strip material having resilient stiffness and indefinite length, a first feed means operable to draw the strip material at variable rate, a second feed means preceding the first feed means and operable to draw strip material from the supply means in response to drawing of strip material by the first feed means, said second feed means forming a running slack loop of the strip material one side of which extends to the first feed means to be drawn freely thereby and the other side of which extends to the supply means, said second feed means comprising an independently driven rotative element and an opposing strip guide element so positionally related to the rotative element as to capture and hold said loop with the sides of the loop passing between the elements and the base of the loop maintained by its resilient stiffness wider than the spacing between said elements, the rotative element being frictionally engageable with the strip in reactive response to shortening of the loop by the first feed means so as to thereby draw strip material from the supply means to relengthen the loop.
Claim 8
Dependent Claim
40 words
The apparatus defined in claim 5, wherein the strip guide element is a stationary element slidably engageable with the strip and the rotative element is positioned relatively to deflect the strip with a partial wrap around it into the loop.
Claim 9
Dependent Claim
169 words
In a strip feed apparatus, in combination with supply means to carry and deliver strip material having resilient stiffness and indefinite length, a first feed means operable to draw the strip material at variable rate, a second feed means preceding the first feed means and operable to draw strip material from the supply means in response to drawing of strip material by the first feed means, said second feed means including opposing elements forming a running slack loop of the strip material, one side of which extends to the first feed means to be drawn freely thereby and the other side of which extends to the supply means, one element of said second feed means comprising a continuously rotated friction roll slidably engageable with the strip on one side of the loop and operable in direct reactive response to shortening of the loop causing the strip to press more forcibly against said friction roll thereby to draw strip material from the supply means so as to relengthen the loop.
Claim 10
Dependent Claim
169 words
In a strip feed apparatus, in combination with supply means to carry and deliver strip material having resilient stiffness and indefinite length, a first feed means operable to draw the strip material at variable rate, a second feed means preceding the first feed means and operable to draw strip material from the supply means in response to drawing of strip material by the first feed means, said second feed means including opposing elements forming a running slack loop of the strip material, one side of which extends to the first feed means to be drawn freely thereby and the other side of which extends to the supply means, one element of said second feed means comprising a continuously rotated friction roll slidably engageable with the strip on one side of the loop and operable in direct reactive response to shortening of the loop causing the strip to press more forcibly against said friction roll thereby to draw strip material from the supply means so as to relengthen the loop.
Claim 11
Independent Claim
119 words
The method of feeding strip material at instantaneously variable rate with the strip drawn from a supply at a different instantaneous variable rate, comprising the steps of forming a slack running loop of the strip, guiding one side of the loop to be drawn at the variable rate thereby to shorten the loop, and frictionally engaging the strip with a continuously rotated friction surface in extending from the source into the opposite side of the loop, thereby to effect feeding of the strip into the loop by increased traction of said friction surface thereon in direct reactive response to such shortening of the loop so as to draw additional strip from the supply and thereby to relengthen the loop.
Claim 12
Independent Claim
119 words
The method of feeding strip material at instantaneously variable rate with the strip drawn from a supply at a different instantaneous variable rate, comprising the steps of forming a slack running loop of the strip, guiding one side of the loop to be drawn at the variable rate thereby to shorten the loop, and frictionally engaging the strip with a continuously rotated friction surface in extending from the source into the opposite side of the loop, thereby to effect feeding of the strip into the loop by increased traction of said friction surface thereon in direct reactive response to such shortening of the loop so as to draw additional strip from the supply and thereby to relengthen the loop.
Claim 13
Dependent Claim
63 words
The method defined in claim 8 wherein the frictional engagement in reactive response to shortening of the loop is derived by reacting the increasing resilient force of compression of shortening of the loop against a frictional feed element and an opposing low-friction guide surface spaced across a gap from such feed element narrower than the resiliently maintained base width of the shortened loop.
Claim 14
Dependent Claim
41 words
The method deFined in claim 9 wherein withdrawing of the loop through the gap is prevented by placing a relatively incompressible captive cylindrical element within the loop which is free to revolve and shift with shortening and lengthening of the loop.
Claim 15
Dependent Claim
199 words
In photoprint strip automatic feeding and print cutting apparatus and the like including first means to rotatively support a supply roll of processed photoprint strip from which the strip may be pulled, second means operable to feed the strip at a rapidly variable rate for the cutting of prints requiring strip acceleration rates of which the second means are substantially incapable if worked directly against the inertia and drag of the supply roll on the first means, and third means operatively interposed between the first and second means and maintaining a continuous running slack loop of the strip which is materially shortened as strip material is drawn from one side of the loop by the second means, said third means including opposing elements relatively positioned to bear against opposite sides of the loop and forming a gap of predetermined width substantially less than the width of the loop, one such element comprising a continuously rotated friction roll relatively disposed for partial enwrapment by the strip leading from the first means into one side of the loop, and the other such element being disposed to guide the opposite side of the loop as it is drawn by the second means.
Claim 16
Dependent Claim
199 words
In photoprint strip automatic feeding and print cutting apparatus and the like including first means to rotatively support a supply roll of processed photoprint strip from which the strip may be pulled, second means operable to feed the strip at a rapidly variable rate for the cutting of prints requiring strip acceleration rates of which the second means are substantially incapable if worked directly against the inertia and drag of the supply roll on the first means, and third means operatively interposed between the first and second means and maintaining a continuous running slack loop of the strip which is materially shortened as strip material is drawn from one side of the loop by the second means, said third means including opposing elements relatively positioned to bear against opposite sides of the loop and forming a gap of predetermined width substantially less than the width of the loop, one such element comprising a continuously rotated friction roll relatively disposed for partial enwrapment by the strip leading from the first means into one side of the loop, and the other such element being disposed to guide the opposite side of the loop as it is drawn by the second means.
Claim 17
Dependent Claim
37 words
The combination defined in claim 11, wherein the second element of the third means comprises a low-friction stationary guide means across which the strip on one side of the loop is drawn slidably by the second means.
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) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |