US3779440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Form run-out and jam detector for printer
Assignee: International Business Machines Corp
•
Filing: 1972-04-20
•
Granted: 1973-12-18
•
Expires: 1992-04-20
Abstract
Abstract An error counter counts the lines moved by a continuous form tractor. The error counter is reset by pulses generated by a detector connected to detect feed holes in the form as they pass. If the form jams, a form run-out occurs, or forms shingling occurs with multiple forms, the feed hole pulses are interrupted and the error counter advances to a predetermined error count, producing an error output signal to stop the machine and/or activate an error indicator.
Inventors
- 👤 G Schreck
- 👤 E Tomassini
- 👤 W Casale
- 👤 F Saltz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:17
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/02; G03B27/04; G03B27/08; B; B41; B41J; B41J29/00; B41J29/46; B41J29/48; G03B21/00; G03B21/14; G03B21/32; G03B21/43
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
147 words
Error detection means for form feeding means having drive means with a plurality of projecting pins spaced to fit in a plurality of uniformly spaced feed holes in a form comprising, an error counter producing an error output in response to a predetermined count, means to detect said holes as said form moves past connected to said error counter to reset said error counter, a line indicator counter having a plurality of outputs operated by said drive means and having at least one of said outputs connected to said error counter to advance said error counter one count each time said form feed means advances said form one line, and means including an emitter driven by said form feed means to produce output pulses for each predetermined increment of form feed means advance connected to operate said line indicator counter each time said form advances one line.
Claim 2
Dependent Claim
147 words
Error detection means for form feeding means having drive means with a plurality of projecting pins spaced to fit in a plurality of uniformly spaced feed holes in a form comprising, an error counter producing an error output in response to a predetermined count, means to detect said holes as said form moves past connected to said error counter to reset said error counter, a line indicator counter having a plurality of outputs operated by said drive means and having at least one of said outputs connected to said error counter to advance said error counter one count each time said form feed means advances said form one line, and means including an emitter driven by said form feed means to produce output pulses for each predetermined increment of form feed means advance connected to operate said line indicator counter each time said form advances one line.
Claim 3
Dependent Claim
52 words
The invention as defined in claim 1 characterized by said means for detecting holes comprising a light source and a photo-transistor positioned on the same side of said form in alignment with said holes to operate in response to interruption of light reflected from said form due to passage of said holes.
Claim 4
Dependent Claim
49 words
The invention as defined in claim 1 characterized by said line indicator counter having gate means selectively connecting different ones of said plurality of outputs to said error counter to advance said error counter one count for each line advance of the form for different values of line pitch.
Claim 5
Dependent Claim
44 words
The invention as defined in claim 3 characterized by said error counter having a plurality of outputs and gate means selectively responsive to different line pitch values connecting said outputs to provide an error signal when said error counter reaches a predetermined error count.
References Cited (Backward Citations)
US2983357A
Cited
US3414671A
Cited
US3370286A
Cited
US3499516A
Cited
US3558862A
Cited
US3659081A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |