US3721375A Expired / Lapsed US ⏱️ 0.0 years remaining

Web feed mechanism for wrapping machines

Assignee: Package Machinery Co

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Filing: 1971-02-01

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Granted: 1973-03-20

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Expires: 1991-02-01

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Abstract

Abstract An apparatus for feeding a web of material, such as a plastic film or paper, from a supply roll and for cutting it into sheets of desired length to be used in a package wrapping machine or the like. The apparatus utilizes driven opposed rolls to withdraw the web from the supply roll and to advance the leading section of the web onto the end of a driven conveyor which retains the section by vacuum. A cutter mechanism is driven in timed relationship to the web movement to slash the web transversely as it passes from the rolls onto the conveyor. The transverse slashing provides a serrated cut, leaving tabs which connect the leading section on the conveyor with the remainder of the web. Then, in further travel, opposed high speed rollers engage the leading section on the conveyor to tear the tabs and thus separate the leading section as a wrapper sheet of required length.

Inventors

👤 F Roberts
👤 J Groom

Bibliographic Details

Application Number —

Jurisdiction US

Data Source google_patents

Last Synchronized 2026-11-09 09:28

CPC Classifications

B; B65; B65B; B65B61/00; B65B61/04; B65B61/06; B65B61/08; B26; B26D; B26D1/00; B26D1/01; B26D1/12; B26D1/25; B26D1/34; B26D1/38; B26D1/385; Y; Y10; Y10T; Y10T225/00; Y10T225/30; Y10T225/307; Y10T225/321; Y10T225/35; Y10T83/00; Y10T83/202; Y10T83/2092; Y10T83/2183; Y10T83/2185; Y10T83/465; Y10T83/4714

Claims Analysis

Total Claims: 5

Claim 1

Independent Claim 264 words

Apparatus for feeding a web of material and separating it into sheets for a wrapping machine or the like comprising a first driven means engaging the web to withdraw it from a supply roll or the like to advance it at a predetermined rate, a driven conveyor means spaced from said first means and arranged to receive and convey the leading section of the advancing web, a cutter mechanism disposed between said first means and said conveyor means to intermittently engage and slash the advancing web transversely thereof except for spaced apart tabs which connect the leading section of the web on the conveyor means to the following portion of the web, said cutter mechanism comprising a bed blade mounted in a pivoted support on one side of the web and transversely thereof, a shear blade retained in a rotary mount on the other side of the web, drive means for the cutter mechanism operable in timed relationship with said first means and conveyor means to rotate said shear blade mount and to move said bed blade toward and away from the web so that said shear blade and bed blade cooperate to slash said web only once during a selected number of revolutions of the shear blade mount, and second driven means supported for movement into brief engagement with the leading section of the web on the conveyor means, said second driven means tending to advance said leading section at a speed greater than said rate, whereby to tear said tabs and separate said leading section from the web as a wrapper sheet.

Claim 2

Dependent Claim 264 words

Claim 3

Dependent Claim 51 words

The apparatus of claim 1 wherein said first driven means comprises a pair of opposed rolls which engage the web therebetween, and said conveyor means comprises at least one endless perforate belt through which a vacuum is drawn to retain and convey the leading section of the web on said belt.

Claim 4

Dependent Claim 86 words

The apparatus of claim 1 wherein said first driven means comprises a pair of opposed rolls which engage the web therebetween, and said second driven means comprises at least one pair of opposed rollers driven at a higher peripheral speed than said opposed rolls, at least one of said rollers in a pair being movable relative to the other and to the leading section of the web and movable toward said other roller to engage the said leading section briefly between the rollers in a pair.

Claim 5

Dependent Claim 135 words

The apparatus of claim 1 wherein said first driven means comprises a pair of opposed rolls which engage the web therebetween, said driven conveyor means comprises a plurality of transversely spaced endless perforate belts through which a vacuum is drawn to retain the leading section of the web on the belts, and said second driven means comprises a plurality of pairs of opposed rollers which are spaced transversely in pairs, each pair being driven at a higher peripheral speed than said rolls, at least one roller in each pair being movable relative to the other and to the leading section of the web, all of said one rollers in the pairs being movable together toward the other rollers to engage the leading section of the web briefly but simultaneously between the rollers in the pairs.

References Cited (Backward Citations)

US2268190A Cited

US2456699A Cited

US2639772A Cited

US2956484A Cited

US3101164A Cited

US3269235A Cited

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USPTO Annuity & Maintenance Windows

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1976-03-19	1976-09-18	1977-03-20	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1980-03-19	1980-09-18	1981-03-20	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1984-03-19	1984-09-18	1985-03-20	$7700.00	Window Closed / Lapsed

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