Patent US3737159A successfully refreshed from Google Patents.
US3737159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for preventing successive jamming of copy sheets in copying apparatus
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1971-06-01
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Granted: 1973-06-05
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Expires: 1991-06-01
Abstract
Abstract Apparatus for preventing successive jamming of copy sheets in copying apparatus including a detecting machine generating a first signal in response to delivery of a copy sheet at the initial nip of a forwarding mechanism of the copying apparatus by a copy sheet feeding mechanism, another detecting mechanism generating a second signal in response to the arrival of a copy sheet at a discharge nip of the forwarding mechanism, and a control switch mechanism responsive to the first and second signals to inhibit operation of the copy sheet feeding mechanism when in a first state responsive to the first signal and to enable operation of the copy sheet feeding mechanism in response to the second signal such that the copy sheet feeding mechanism is inhibited when a copy sheet is in a forwarding passage of the copying apparatus to prevent successive jamming of the copy sheets. The control switch mechanism is essentially a bistable circuit switching states in response to the first and second signals and various control mechanism are disclosed utilizing relays, semi-conductor devices, gas tubes and combinations thereof.
Inventors
- 👤 T Washio
- 👤 T Aizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:09
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/70
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
211 words
In copying apparatus including a treatment zone for forming a visible image on a copy sheet, a forwarding mechanism for moving a copy sheet along a forwarding passage through the treatment zone from an initial nip to a discharge nip, and a copy sheet feeding mechanism for delivering single copy sheets to the initial nip of the forwarding mechanism, the improvement comprising: first detecting means generating a first signal in response to delivery of a copy sheet at the initial nip of the forwarding mechanism; second detecting means generating a second signal in response to arrival of a copy sheet at the discharge nip of the forwarding mechanism; and control means for controlling the copy sheet feeding mechanism having a first state inhibiting operation of the copy sheet feeding mechanism and a second state enabling operation of the copy sheet feeding mechanism, said control means being placed in said first state in response to said first signal and being placed in said second state in response to said second signal whereby said control means is in said first state when a copy sheet is in the forwarding passage to inhibit the feeding of another copy sheet to the initial nip of the forwarding mechanism and prevent successive jamming of copy sheets.
Claim 2
Dependent Claim
211 words
In copying apparatus including a treatment zone for forming a visible image on a copy sheet, a forwarding mechanism for moving a copy sheet along a forwarding passage through the treatment zone from an initial nip to a discharge nip, and a copy sheet feeding mechanism for delivering single copy sheets to the initial nip of the forwarding mechanism, the improvement comprising: first detecting means generating a first signal in response to delivery of a copy sheet at the initial nip of the forwarding mechanism; second detecting means generating a second signal in response to arrival of a copy sheet at the discharge nip of the forwarding mechanism; and control means for controlling the copy sheet feeding mechanism having a first state inhibiting operation of the copy sheet feeding mechanism and a second state enabling operation of the copy sheet feeding mechanism, said control means being placed in said first state in response to said first signal and being placed in said second state in response to said second signal whereby said control means is in said first state when a copy sheet is in the forwarding passage to inhibit the feeding of another copy sheet to the initial nip of the forwarding mechanism and prevent successive jamming of copy sheets.
Claim 3
Dependent Claim
48 words
The improvement as recited in claim 1 wherein said control means includes normally closed contact means connected in series with actuating means for the copy sheet feeding mechanism, said control means being opened when said control means is in said first state in response to said first signal.
Claim 4
Dependent Claim
96 words
The improvement as recited in claim 1 wherein said control means includes actuating means for operating the copy sheet feeding mechanism, double throw switch means having first contact means connected in series with said actuating means and second contact means, and alarm means connected in series with said second contact means, said first contact means being open and said second contact means being closed when said control means is in said first state and said first contact means being closed and said second contact means being open when said control means is in said second state.
Claim 5
Dependent Claim
60 words
The improvement as recited in claim 3 wherein said control means includes alarm switch means connected in series with said second contact means and said alarm means, said alarm switch means being closed after completion of a copying cycle to energize said alarm means if said control means is not in said second state in response to said second signal.
Claim 6
Dependent Claim
121 words
The improvement as recited in claim 1 wherein said control means includes actuating means for operating the copy sheet feeding mechanism and relay means having hold-in contact means and contact mEans normally closed when said control means is in said second state and connected with said actuating means, said first detecting means includes normally open switch means generating said first signal when closed and connected to energize said relay means when closed to open said normally closed contact means to prevent energizing of said actuating means, and said second detecting means includes normally closed switch means generating said second signal when opened to deenergize said relay means and close said normally closed contact means to permit energization of said actuating means.
Claim 7
Dependent Claim
106 words
The improvement as recited in claim 1 wherein said control means includes a bistable circuit having input means and output means, switch means responsive to said output means, and actuating means for operating the copy sheet feeding mechanism connected with said switch means, said bistable circuit receiving said first and second signals at said input means and being responsive to said first signal to provide a signal at said output means opening said switch means to deenergize said actuating means and being responsive to said second signal to provide a signal at said output means closing said switch means to permit energization of said actuating means.
Claim 8
Dependent Claim
60 words
The improvement as recited in claim 6 wherein said switch means includes a relay having a winding connected with said bistable circuit output means and controlling contact means in series with said actuating means, said contact means being open when said control means is in said first state and being closed when said control means is in said second state.
Claim 9
Dependent Claim
143 words
The improvement as recited in claim 1 wherein said control means includes actuating means for operating the copy sheet feeding mechanism, a controlled rectifier having an anode-cathode circuit and a control electrode, and relay means having a winding connected in said anode-cathode circuit and controlling contact means connected in series with said actuating means, said first detecting means includes normally open switch means connected with said control electrode and closed to generate said first signal to trigger said controlled rectifier and energize said winding to open said contact means to inhibit energization of said actuating means, and said second detecting means includes normally closed switch means connected in said anode-cathode circuit of controlled rectifier and opened to generate said second signal to render said controlled rectifier non-conductive and deenergize said winding to close said contact means to permit energization of said actuating means.
Claim 10
Dependent Claim
31 words
The improvement as recited in claim 1 wherein said first and second detecting means each includes switch means disposed in the forwarding passage and actuated by contact with a copy sheet.
Claim 11
Dependent Claim
45 words
The improvement as recited in claim 1 wherein said first and second detecting means each includes an optical detector having a light source directing light across the forwarding passage and a light responsive circuit actuated when a copy sheet intercepts light across the forwarding passage.
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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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |