Patent US4426123A successfully refreshed from Google Patents.
US3607550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making plastic bags
Assignee: EIDP Inc
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Filing: 1968-11-22
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Granted: 1971-09-21
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Expires: 1988-11-22
Abstract
Abstract Disclosed herein is an apparatus for effecting longitudinally spaced apart transverse seals with a high degree of linear accuracy in a continuous web of plastic material having a plurality of layers. The apparatus comprises two sets of dual sealer drive rollers for advancing the web past the sealer, and a means for accurately controlling the operation of the sealer and drive rolls. This control means comprises a digital converter operatively in contact with the drive rollers, adapted to convert the angle through which the roller has rotated into a train of electrical pulses. A counter is operatively connected to the converter and is responsive to the train of pulses so that when a predetermined number of these pulses are recorded, an electrical signal is emitted that activates a brake to stop the drive rolls and concomitantly activates a sealer.
Inventors
- 👤 Thomas Cass Ballanger
- 👤 Jake Schoonderwoerd
- 👤 John H Oldham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:00
CPC Classifications
B; B31; B31B; B31B70/00; B31B70/02; B31B70/10; B31B2160/00; B31B2160/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
97 words
An apparatus for conveying and intermittently sealing portions of an indefinite length of plastic comprising: a. a draw roll means spaced apart from a sealer means; b. drive means for driving said drive roll in the absence of a predetermined electrical signal; c. pulse means contacting said draw roll for converting revolutions of said draw roll into electrical pulses; and d. counter means in electrical contact with said pulse means adapted to generate said predetermined electrical signal upon recording a predetermined number of pulses, wherein said counter contains means for erasing pulses previously recorded by said counter.
Claim 2
Dependent Claim
29 words
An apparatus as defined in claim 2, wherein said sealer is adapted to activate said means for erAsing pulses previously recorded by the counter upon reaching a nonsealing position.
Claim 3
Independent Claim
133 words
An apparatus for conveying and intermittently sealing portions of an indefinite length of plastic comprising: a. draw rolls disposed on both sides of and spaced apart from a reciprocating means for sealing plastic material; b. drive means for driving said drive rolls in the absence of a predetermined signal; c. pulse means contacting said draw rolls, for converting revolutions of said draw roll into electrical pulses; and, d. counter means in electrical contact with said pulse means for counting pulses generated by said pulse means and adapted to generate a predetermined electrical signal upon recording a predetermined number of said pulses, said electrical signal being adapted to activate means to (1) disengage said drive means from a drive disengageably (2) brake said drive shaft to a halt; and (3) operate said sealer means.
Claim 4
Dependent Claim
20 words
An apparatus as defined in claim 4, wherein said counter contains means for erasing pulses previously recorded by said counter.
Claim 5
Dependent Claim
29 words
An apparatus as defined in claim 5, wherein said sealer is adapted to activate said means for erasing pulses previously recorded by the counter upon reaching a nonsealing position.
Claim 6
Dependent Claim
64 words
An apparatus as defined in claim 4, wherein a pair of coacting draw rolls are disposed on both sides of said sealer means adapted to traverse a web of plastic material in an S-shaped path through each path in order that there be sufficient frictional forces between said web and said pair of draw rolls to prohibit slippage between the web and draw rolls.
Claim 7
Independent Claim
126 words
An apparatus for effecting longitudinally spaced-apart transverse seals in a continuous web of plastic material having a plurality of layers, comprising means for producing said seals, drive roller means for advancing said web past said seal-producing means and control means for controlling operation of said seal-producing means, said control means comprising a digital converter operatively connected to said drive roller means for producing a train of electrical pulses, which represent in number the angle through which said roller means is rotated and means operatively connected to said converter and being responsive to the production of a predetermined number of pulses for rendering said drive roller means inoperative to advance said web, and for activating said seal-producing means for transversely welding the layers in said web together.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |