US3892153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for cutting pieces from a traveling strip of sheet material
Assignee: Mitsubishi Chemical Corp
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Filing: 1974-01-17
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Granted: 1975-07-01
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Expires: 1994-01-17
Abstract
Abstract Continuously cast plastic strip has interspaced marks or defects with lengths of unmarked usable strip therebetween. To obtain a maximum possible yield of sheets from such strip, the lengths of the portions between the marks or defects are measured and cut into sheets of two or more different lengths, the cutting being such as to produce the maximum yield of sheets of either or all lengths, singly or in combination, which can be obtained from the length cut. This procedure reduces the loss or waste due to the marks or defects, to a minimum. A special system is provided for this practice and for cutting out the marks or defects between the unmarked strip portions free from defects, with a minimum of loss or waste. Other features are involved.
Inventors
- 👤 Tetsuji Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:20
CPC Classifications
C; C03; C03B; C03B33/00; C03B33/02; C03B33/023; C03B33/037; B; B23; B23D; B23D36/00; B23D36/0008; B23D36/0016; B23D45/00; B23D45/18; B23D45/20; B26; B26D; B26D11/00; B27; B27B; B27B5/00; B27B5/02; B27B5/06; B27B5/063; C03B33/027; Y; Y02; Y02P; Y02P40/00; Y02P40/50; Y02P40/57; Y10; Y10T; Y10T83/00; Y10T83/242; Y10T83/465; Y10T83/4653; Y10T83/4656; Y10T83/4676; Y10T83/4679; Y10T83/4682; Y10T83/4705; Y10T83/4757; Y10T83/476; Y10T83/525; Y10T83/541; Y10T83/543
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
322 words
A system for cutting sheet pieces from a traveling strip of sheet material comprising: means for measuring a length of the traveling strip of sheet material, said measuring means emitting an electric signal in response to measurement of a length of the traveling strip; means for detecting a faulty portion in the traveling strip of sheet material, said detecting means emitting an electric signal upoN detection of a faulty portion; means for presetting into the system at least two different lengths for the sheet pieces to be cut from the traveling strip of the sheet material; computing means connected to the length measuring means, the faulty portion detecting means and the presetting means, said computing means carrying out a specified computation comprising confirming the position of each said faulty portion in the traveling strip in response to signals from said length measuring and faulty portion detecting means, detecting each length of each usable longitudinally extending portion between adjacent said confirmed positions of said faulty portion in the traveling strip or between said confirmed positions of said faulty portions and the immediately previous or subsequent severed end of the sheet material, and determining a ratio of numbers of sheet pieces of said at least two different lengths in said presetting means for obtaining an entire combined length which is closest to the length of each said usable sheet portion, said computing means further storing the ratio of numbers of sheet pieces for each said usable sheet portion of the traveling sheet and then sequentially emitting signals, each indicative of a command for initiation of severing of each of said different lengths of sheet pieces from each said usable sheet portion on the basis of said stored sheet number ratio; and severing means connected to said computing means for severing sheet pieces from the traveling strip of the sheet material in response to respective said sequential signals indicative of commands from said computing means.
Claim 2
Independent Claim
322 words
A system for cutting sheet pieces from a traveling strip of sheet material comprising: means for measuring a length of the traveling strip of sheet material, said measuring means emitting an electric signal in response to measurement of a length of the traveling strip; means for detecting a faulty portion in the traveling strip of sheet material, said detecting means emitting an electric signal upoN detection of a faulty portion; means for presetting into the system at least two different lengths for the sheet pieces to be cut from the traveling strip of the sheet material; computing means connected to the length measuring means, the faulty portion detecting means and the presetting means, said computing means carrying out a specified computation comprising confirming the position of each said faulty portion in the traveling strip in response to signals from said length measuring and faulty portion detecting means, detecting each length of each usable longitudinally extending portion between adjacent said confirmed positions of said faulty portion in the traveling strip or between said confirmed positions of said faulty portions and the immediately previous or subsequent severed end of the sheet material, and determining a ratio of numbers of sheet pieces of said at least two different lengths in said presetting means for obtaining an entire combined length which is closest to the length of each said usable sheet portion, said computing means further storing the ratio of numbers of sheet pieces for each said usable sheet portion of the traveling sheet and then sequentially emitting signals, each indicative of a command for initiation of severing of each of said different lengths of sheet pieces from each said usable sheet portion on the basis of said stored sheet number ratio; and severing means connected to said computing means for severing sheet pieces from the traveling strip of the sheet material in response to respective said sequential signals indicative of commands from said computing means.
Claim 3
Dependent Claim
65 words
A system for cutting sheet pieces from a traveling strip of sheet material as claimed in claim 1, wherein said length measuring means comprise a rotary wheel rotatable on the surface of said traveling sheet of the sheet material, and a pulse emitter associated with the rotary wheel for emitting an electric pulse in response to a predetermined number of revolutions of said rotary wheel.
Claim 4
Dependent Claim
57 words
A system for cutting sheet pieces from a traveling strip of sheet material as claimed in claim 1, wherein said faulty portion detecting means is provided with a plurality of detectors, each detecting defects formed in the traveling strip of the sheet material, and another detector detecting thickness imperfections in the traveling strip of the sheet material.
Claim 5
Dependent Claim
106 words
A system for cutting sheet pieces from a traveling strip of sheet material as claimed in claim 1, wherein said severing means comprise a plurality of severing apparatuses arranged at intervals in the longitudinal direction the same as and parallel to the strip''s traveling direction, each said severing apparatus being provided with a strip cutter, and means responsive to said command signals from said computing means for reciprocating said cutter through a cycle of a cutting stroke extending diagonally across the traveling strip to sever the traveling strip right angularly, and a return stroke returning the cutter to a position of readiness for a succeeding cycle.
Claim 6
Dependent Claim
146 words
A system for cutting sheet pieces from a traveling strip of sheet material as claimed in claim 4, in which said reciprocating means of each said severing apparatus comprises a frame means extending transversely over the traveling strip of the sheet material and being longitudinally reciprocative in parallel with the traveling strip, and carriage means mounted on the frame means to reciprocate at right angles to the traveling strip while carrying the strip cutter thereon, and wherein the system is further provided with means for forming conveying passageways extending over the spaces formed in the positions adjacent to the longitudinally fore and back ends of each said severing apparatus, each of said coveying passageways conveying a strip end approaching the severing means or severed strip ends cut by said strip cutter of each said severing apparatus and the neighboring strip portion, in the strip''s traveling direction.
Claim 7
Dependent Claim
119 words
A system fOr cutting sheet pieces from a traveling strip of sheet material as claimed in claim 5, wherein said conveying passageway means comprises at least a mechanism provided with a first group of roll members capable of moving integrally with the frame means of said severing apparatus during the longitudinal reciprocation, a second group of roll members rotatable at stationary positions in each said space, and at least a belt member running, under an appropriate tension applied thereto, among said first and second groups of roll members, at least one of said first and second groups of roll members being connected with a drive source for providing the running speed equal to strip''s traveling speed for said belt.
Claim 8
Dependent Claim
41 words
A system for cutting sheet pieces from a traveling strip of sheet material as claimed in claim 4, wherein each said severing apparatus is provided with means for covering the strip cutter and the sheet portion severed by said strip cutter.
Claim 9
Dependent Claim
40 words
A system for cutting sheet pieces from a traveling strip of sheet material as claimed in claim 7, wherein said covering means collects scraps or chips formed when the sheet material is severed by said strip cutter including rotary saws.
Claim 10
Dependent Claim
98 words
A system for cutting sheet pieces from a traveling strip of sheet material as claimed in claim 8, wherein said covering means comprise a pair of box-like casings, respectively arranged on opposite sides relative to the surfaces of the traveling strip of the sheet material, said casings forming a closed space when they come into contact with the opposite surfaces of the traveling strip by an actuation of a cylinder means, in which closed space said severing rotary saws carry out said cycle of the cutting and the return strokes to sever the traveling strip of sheet material.
Claim 11
Dependent Claim
73 words
A system for cutting sheet pieces from a traveling strip of sheet material as claimed in claim 9, wherein each said casing is provided with a brush member for absorbing the relative movement between each said casing and each said severing saw during said cycle of the cutting and return strokes, and supports attached to said casing for supporting the traveling sheet at the time of said cutting stroke of said severing saw.
Claim 12
Dependent Claim
48 words
A system for cutting sheet pieces from a traveling strip of sheet material as claimed in claim 9, wherein each said casing is provided with an opening for connecting said closed space to a vacuum line whereby said collected scraps and chips are sucked into the vacuum line.
Claim 13
Dependent Claim
207 words
A system for cutting sheet pieces from a traveling strip of sheet material as claimed in claim 1, in which said severing means comprises a severing apparatus provided with a frame means extending transversely over the traveling strip of the sheet material and being capable of reciprocating along guide means extending longitudinally on opposite sides and in parallel with the traveling strip of the sheet material, a carriage carrying a strip cutter thereon and being mounted on said frame means to reciprocate at right angles to the traveling strip, and control means responsive to said command signals of said computing means for controlling reciprocating motions of said frame means and carriage so that said cutter carries out a cutting stroke extending diagonally across the traveling strip to sever said strip right angularly, and a return stroke to a position of readiness for a succeeding cycle, and wherein said severing apparatus is provided with means for forming at least a conveying passageway extending over the space formed in the position adjacent to the longitudinally fore or back end of said frame means, said conveying passageways effectuating a smooth conveying of the strip portions approaching said severing apparatus or leaving from said severing apparatus in the strip''s traveling direction.
Claim 14
Dependent Claim
107 words
A system for cutting sheet pieces from a traveling strip of sheet material as claimed in claim 1, in which said severing means comprises a severing apparatus provided with a strip cutter, and control means respOnsive to said command signals from said computing means for reciprocating said cutter through a cycle of a cutting stroke extending diagonally across the traveling strip to sever the traveling strip right angularly, and a return stroke returning said cutter to a position of readiness for a succeeding cycle, and wherein said severing apparatus is provided with means for covering said strip cutter and the sheet portion severed by said strip cutter.
Claim 15
Dependent Claim
41 words
A system for cutting sheet pieces from a traveling strip of sheet material as claimed in claim 13, wherein said covering means collects scraps or chips formed when the sheet material is severed by said strip cutter consisting of rotary saws.
Claim 16
Dependent Claim
76 words
A system for cutting sheet pieces from a traveling strip of sheet material as claimed in claim 1, wherein said strip of sheet material is a strip of cast plastic formed by continuous casting using a casting space defined by opposing spans formed by endless belt loops of different lengths and each made of metal strip having ends welded together and forming joints which mark the strip to form at least some of said faulty portions.
References Cited (Backward Citations)
US3205740A
Cited
US3552252A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |