Patent US3722773A successfully refreshed from Google Patents.
US3722773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jam detector
Assignee: Individual
•
Filing: 1972-06-19
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Granted: 1973-03-27
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Expires: 1992-06-19
Abstract
Abstract A jam detector for use in bag-making machines having a pair of opposed draw rollers with circumferential recesses formed therein comprising a plurality of stationary fingers mounted for alignment with the recesses formed in one roller for guiding stock material, a plurality of fingers mounted for pivotal movement into and out of the recesses formed in the other roller, and limit switch means operatively connected to said pivotallymounted fingers for stopping said draw rollers within a cycle upon jamming of said stock.
Inventors
- 👤 G Plate
- 👤 N Hattem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:22
CPC Classifications
B; B31; B31B; B31B70/00; B31B70/006; B31B2160/00; B31B2160/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
A jam detector for use in a bag-making machine having a pair of opposed draw rollers for engaging and advancing stock material therethrough comprising a plurality of circumferential recesses formed along the lengths of said rollers, a plurality of stationary fingers rigidly mounted in alignment with said recesses in one roller for guiding said stock material between said rollers, a plurality of fingers mounted on a common support journaled for pivotal movement whereby said latter fingers are normally biased out of but are free to pivot into recesses formed in the second roller, and a limit switch operatively connected to said pivotally mounted fingers for actuation of said switch to stop said draw rollers by pivotal movement of said fingers into the recesses upon jamming of said stock.
Claim 2
Dependent Claim
128 words
A jam detector for use in a bag-making machine having a pair of opposed draw rollers for engaging and advancing stock material therethrough comprising a plurality of circumferential recesses formed along the lengths of said rollers, a plurality of stationary fingers rigidly mounted in alignment with said recesses in one roller for guiding said stock material between said rollers, a plurality of fingers mounted on a common support journaled for pivotal movement whereby said latter fingers are normally biased out of but are free to pivot into recesses formed in the second roller, and a limit switch operatively connected to said pivotally mounted fingers for actuation of said switch to stop said draw rollers by pivotal movement of said fingers into the recesses upon jamming of said stock.
Claim 3
Dependent Claim
19 words
A jam detector as claimed in claim 1, in which said pivotally-mounted fingers are opposed to said stationary fingers.
Claim 4
Dependent Claim
93 words
A jam detector as claimed in claim 1, wherein said draw rollers are arranged one above the other and said draw rollers have a plurality of corresponding opposed peripheral recesses formed therein, said stationary fingers being disposed in recesses formed in the lowermost draw roller and said pivotally mounted fingers being disposed for pivotal movement into the recesses formed in the uppermost draw roller, wherein stock material travelling between the rollers will displace the pivotally mounted fingers upwards upon jamming of stock material between the draw rollers for actuation of the limit switch.
Claim 5
Dependent Claim
25 words
A jam detector as claimed in claim 3, in which said pivotally-mounted fingers are biased out of said recesses by the weight of the fingers.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |