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Method for operating a recording device powered by at least one rechargeable accumulator
| Details |
Inventors: Pham, Ngoc Q.; Eiler, Walter; Drees, Friedrich-Wilhelm; Al-Khatib, Mohamed; Pekruhn, Wolfgang;
Assignee: Eastman Kodak Company (Rochester, NY)
Primary Examiner: Wiecking; David A.
Assistant Examiner: Kelley; Steven S.
Attorney, Agent or Firm: Kenyon & Kenyon
In order to reduce the power requirement of the recording device (1) and thereby to achieve long operating readiness, the recording device (1) is placed in a stand-by state (Z3) during phases when recording is inactive, in which state its control electronics (22) function in power-saving mode. When a charger (3) is connected, the accumulator (2) is charged. The recording device (1) is placed into an operative state (Z4), if the accumulator (4) has a sufficient charge. To further reduce the power requirement, the recording device (1), from the stand-by state (Z3, is separated from the accumulator (2) by opening an electric switch (12), if it has remained in the stand-by state for a certain period of time. The state of charge of the accumulator (2) is monitored, and if it falls below a certain level and the charger (3) is disconnected, the recording device (1) is placed into the electrically shut off state (2), and if the charger (3) is connected, it is placed into the stand-by state (Z3). |
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DETAILED DESCRIPTION According to FIG.
1, a recording device 1 is powered by rechargeable accumulators 2.
A charger 3 can be attached at a connection point 4 for charging the accumulators 2, and can therefore be connected and disconnected.
The accumulators 2 may be connected with the recording device 1 via a main switch 5.
A monitoring circuit 10 of the recording device 1 has the essential components of a flip-flop 11, a SIPMOS field effect transistor as an electric switch 12, a voltage converter 13, a comparator 14, a voltage divider 17, the center switch point 18 of which is passed to an input of an analog/digital converter 20, and a control 22.
The control 22 applies control signals to a print head 23, based on characters to be printed.
At an input 25 of the comparator 14, a reference voltage dropping at a Zener diode is applied, while another input 26 of the comparator 14 is connected with a center switch point 27 of another voltage divider 28.
The A/D converter 20 is activated with a selection signal 31 generated by the control 22.
The digital output signal of the A/D converter 20 is passed to the control 22 via an 8 bit data line 32.
An activation signal is generated in the control 22 when the main switch 5 is activated, and data DATA (recording or control data) arrives at a data interface 35 of the control 22 if--as described below--the state of charge of the accumulators 2 exceeds a predetermined limit (output voltage).
A control output of the control 22 is provided to a cycle input of the flip-flop 11 via a control line 36.
The control 22 receives status signals regarding the: position of the main switch 5 and regarding whether the charger 3 is connected or disconnected, via signal lines 38 and 39.
After the main switch 5 is closed, the electric switch 12 is closed or placed into the conductive state via the flip-flop 11, so that a voltage (between 3.
14 and 4 V) proportional to the output voltage of the accumulators 2 of 16.
5 to 21 V occurs at the input 26 of the comparator 14, via the voltage divider 28
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Electrical and Wave 
