JPH0422821B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field of the Invention] The present invention relates to a recording paper state detection device that automatically recognizes the size and near end of recording paper in a facsimile machine. [Prior art and problems] The recording paper used in facsimile machines is A4 size recording paper and B4 size recording paper, and various automatic recognition methods have been proposed and put into practical use to enable mixed use of each size recording paper. has been done. In addition, to recognize the remaining amount of recording paper of each size,
Generally, a method is adopted in which a black line is printed on the side of each size of recording paper up to a position several meters from the end, and the black line is detected by a sensor (during recording, if the near end is detected, the (The recorded image will not be readable at any other position, as it will be treated as a valid message.) By the way, the methods for size recognition and near-end recognition for each size of recording paper mentioned above are independent. A method is adopted in which a sensor 11 detects the position of the spool flange 10 (the solid line indicates B4 size recording paper, the dotted line indicates A4 size recording paper). Therefore, the spool flange 10 may come off from the sensor 11 due to spool movement, etc., and as a result, it becomes impossible to accurately recognize A4 size recording paper and B4 size recording paper, resulting in erroneous recognition. There is. (b) Near-end recognition of B4 size recording paper or A4 size recording paper is as shown in Figure 2.
Since the positions of the black line near-end marks 12a, 13a printed on the sides of the size recording paper 12 or the A4 size recording paper 13 are different, they are arranged in parallel corresponding to each near-end mark 12a, 13a. , and detect by providing two sensors 14 and 15 that are aligned by moving along the long hole, or by one sensor 1.
4, 15 are provided, and each size recording paper 12, 13 is provided.
Each time the sensors 14 and 15 are reloaded, they are moved along the long holes of the sensors 14 and 15 to set the detection position. Therefore, if two sensors 14, 15 are provided, the cost will be high due to the number of parts, and if one sensor 14, 15 is provided, it will be necessary to reload each size of recording paper 12, 13. The operation of moving the sensors 14 and 15 associated with this is troublesome, and if the operation is forgotten, it becomes impossible to recognize the near end. As described above, conventional recording paper of various sizes and near-end state detection devices have the drawbacks of high cost and inability to effectively utilize the functions of each sensor. [Object of the Invention] It is an object of the present invention to solve the above-mentioned problems by simultaneously detecting the size of the loaded recording paper using sensors arranged corresponding to the near-end marks of each size of recording paper. [Structure of the Invention] In a facsimile machine that uses a plurality of types of recording paper of different widths and is provided with a near-end mark that foretells the end of the recording paper near the side edge of the trailing end, the recording paper of a wide width is loaded. It is provided at a position opposite to the near-end mark provided on the recording paper, and outputs a signal when the background color of the recording paper is present, and detects the near-end mark when there is no recording paper. Sometimes there is a first optical sensor that does not output the above-mentioned signal, and when a narrow-width recording paper is loaded, a base color of the recording paper is provided at a position opposite to the near-end mark provided on this recording paper. output a signal when
The second signal does not output the above signal when there is no recording paper or when a near-end mark is detected.
and a first storage means that is set when signals from both the first and second optical sensors are generated to output a wide signal representing the loading of a wide recording paper; a second storage means that is set when there is no signal from the first photosensor and a signal from the second photosensor is generated, and outputs a narrow width signal representing loading of narrow width recording paper; When the signal from the first photosensor is blocked by detection of a near-end mark when the signal is present, and when the signal from the second photosensor is present when the narrow signal is present, the signal from the second photosensor is near-end. A detection logic circuit is provided, and a third storage means is set to output a signal indicating the end of recording paper when the detection is interrupted by the detection of a mark. [Embodiment of the invention] In Fig. 3, 1 is B4 size recording paper,
A black near-end mark 1a is printed on the side of the end of the B4 size recording paper 1. 2 is A4 size recording paper, and a black near end mark 2a is printed on the side of the end of the A4 size recording paper 2, and the near end mark 2a does not overlap with the above near end mark 1a. in position. 3 is a recording rubber roller that feeds the loaded B4 size recording paper 1 or A4 size recording paper 2 while facing the recording electrode 4; 5 is a sensor disposed corresponding to the near end mark 1a of the B4 size recording paper 1; 6 is a sensor placed opposite the near end mark 2a of A4 size recording paper 2,
Each sensor 5, 6 is constructed as a light reflection type having a light projector and a light receiver. Since the sensors 5 and 6 are arranged corresponding to the near-end marks 1a and 2a of each size of recording paper 1 and 2,
It is also used for size detection, and its operation mode during detection is as shown in the table below, details of which will be described later. Note that the paper running system of each size recording paper 1, 2 through which the sensors 5, 6 pass is painted black.

〔Effect of the invention〕

Since the size of each size of recording paper is detected at the same time by a sensor placed opposite to the near-end mark of each size of recording paper, the number of sensors is reduced compared to the conventional method, resulting in cost reduction and The size and near end of each size recording paper can be automatically and accurately recognized without the trouble of moving the sensor every time the size recording paper is loaded.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the size detection principle of conventional recording paper of each size, FIG. 2 is a diagram showing the near-end detection principle of conventional recording paper of each size, and FIG. 3 is a diagram showing the principle of near-end detection of conventional recording paper of each size. FIG. 4 is a diagram showing an example of a state detection device, and FIG. 4 is a diagram showing an example of a detection logic circuit. 1...B4 size recording paper, 2...A4 size recording paper, 1a, 2a...near end mark, 5, 6
...Sensor, 7...Signal distribution gate, SW5,
SW6...Switch, R1, R2...Resistance, INV
1, INV2...Inverter circuit, FF1 to FF3...
…Flip-flop, AND1, AND2, AND
3...AND circuit, OR...OR circuit.

Claims (1)

[Scope of Claims] 1. In a facsimile machine that uses multiple types of recording paper of different widths, each of which is provided with a near-end mark near the side edge of the trailing edge to foretell the end of the recording paper, the wide width of the recording paper is It is provided at a position opposite to the near-end mark provided on this recording paper when loaded, and outputs a signal when the background color of the recording paper is present, and outputs a signal when there is no recording paper and the near-end mark. A first optical sensor 5 which does not output the signal when detected, and a first optical sensor 5 which is provided at a position opposite to the near-end mark provided on the recording paper when narrow width recording paper is loaded, and which detects the bottom of the recording paper. a second optical sensor 6 that outputs a signal when a color is present and does not output the signal when no recording paper is present or when a near-end mark is detected; and both the first and second optical sensors. a first memory means FF1 which is set when a signal of 1 is generated and outputs a wide signal representing loading of a wide width recording paper; a second memory means FF2 which is set when the signal is generated and outputs a narrow width signal representing the loading of narrow width recording paper; When the signal from the second optical sensor is interrupted by the detection of the near-end mark and when the narrow width signal is present, the recording paper is set when the signal from the second optical sensor is interrupted by the detection of the near-end mark. a detection logic circuit comprising a third storage means FF3 that outputs a signal indicating the end of the process;
A recording paper state detection device comprising: