US3825201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for controlling the launching of a reel of web in an unwinder with automatic reel change
Assignee: Individual
•
Filing: 1973-05-22
•
Granted: 1974-07-23
•
Expires: 1993-05-22
Abstract
Abstract An automatic reel change unwinder wherein the reel holder arms are controlled by a change motor stopped by a detecting device, and a signal generator produces a signal depending on the stop position of the said arms for generating, in a computer, a signal suitable for controlling a launching motor which accelerates a new reel intended to replace an exhausted one.
Inventors
- 👤 F Osta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:07
CPC Classifications
B; B65; B65H; B65H19/00; B65H19/10; B65H19/18; B65H19/1857; B65H19/1868; B65H19/1805; B65H19/181; B65H19/1815; B65H2511/00; B65H2511/20; B65H2511/21; B65H2511/23
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
261 words
An automatic reel change unwinder for connecting a web from a new reel to a web in course of unwinding from an exhausted reel, comprising a stationary structure, reel holder arms rotatably mounted on said structure, a change motor connected to said reel holder arms for controllably rotating said arms, a detecting device operating at a stationary predetermined point for detecting without physical contact when the periphery of a reel carried by said reel holder arms reaches said predetermined point during rotation of said arms, a connection between said detecting device and said change motor for stopping said change motor upon operation of said detecting device, signal generator means connected to said arms for generating a signal depending upon the angular position of said arms in the stopped condition, a tachometric signal generator supplying a signal depending upon the linear speed of the web in course of unwinding, a computer connected to both said signal generators for receiving said signals and for generating from said received signals an output signal depending upon the relation between said signal of angular position of said arms and said signal of linear speed of the web, a launching motor connected to and controlled by said computer and connected to said new reel for accelerating the same up to a peripheral speed depending upon said output signal generated by said computer that corresponds, within a predetermined tolerance, to the linear speed of the web in course of unwinding, and a cutting and splicing mechanism operable when said peripheral speed of the new reel has been attained.
Claim 2
Dependent Claim
261 words
An automatic reel change unwinder for connecting a web from a new reel to a web in course of unwinding from an exhausted reel, comprising a stationary structure, reel holder arms rotatably mounted on said structure, a change motor connected to said reel holder arms for controllably rotating said arms, a detecting device operating at a stationary predetermined point for detecting without physical contact when the periphery of a reel carried by said reel holder arms reaches said predetermined point during rotation of said arms, a connection between said detecting device and said change motor for stopping said change motor upon operation of said detecting device, signal generator means connected to said arms for generating a signal depending upon the angular position of said arms in the stopped condition, a tachometric signal generator supplying a signal depending upon the linear speed of the web in course of unwinding, a computer connected to both said signal generators for receiving said signals and for generating from said received signals an output signal depending upon the relation between said signal of angular position of said arms and said signal of linear speed of the web, a launching motor connected to and controlled by said computer and connected to said new reel for accelerating the same up to a peripheral speed depending upon said output signal generated by said computer that corresponds, within a predetermined tolerance, to the linear speed of the web in course of unwinding, and a cutting and splicing mechanism operable when said peripheral speed of the new reel has been attained.
Claim 3
Dependent Claim
59 words
An unwinder as set forth in claim 1, wherein a shaft is journalled on said stationary structure, said reel holder arms are mounted on said shaft and said signal generator means comprise a cam connected to said shaft, a cam follower displaceable by said cam, and a signal generator electric circuit connected to and controlled by said cam follower.
Claim 4
Dependent Claim
53 words
An unwinder as set forth in claim 1, wherein both said signal generators are of mechanical electrical nature, the signals generated thereby are of electrical nature, and said computer is an electronic computer of the type producing an electric signal corresponding to the ratio between the electric signals received from said signal generators.
Claim 5
Dependent Claim
132 words
An unwinder as set forth in claim 1, wherein said detecting device comprises a lamp, said lamp being directed to send a beam of light intersecting at said point the path followed by said new reel during rotation of said arms, a photoelectric cell disposed in the path of said beam of light on the side of said path of the reel which is opposite said lamp so as to be struck by the beam of light of said lamp when said beam is not interrupted by the presence of said new reel, and a feeding circuit being connected to and controlled by said photoelectric cell in order to switch off said change motor when the periphery of said new reel, by reaching its predetermined stop position, interrupts said beam of light.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |