JPH0543658U - Equipment - Google Patents

Abstract

(57) [Summary] [Purpose] Two light emitting diodes and one phototransistor are used to determine the presence or absence of roll paper and the near end. [Structure] The first light-emitting diode 1 is arranged on the roll paper 10. The phototransistor 2 is arranged at a position where the light 8 emitted from the first light emitting diode 1 is reflected by the roll paper 10 and the reflected light is received. The presence or absence of light from the first light emitting diode 1 is detected by the phototransistor, and the detected signal is discriminated by the first discriminating unit 4 to output a near end signal. Second
The light emitting diode 3 is arranged under the roll paper, and the phototransistor receives the blinking light emitted by the second light emitting diode. The phototransistor detects the presence / absence of blinking light, and the second discriminating unit 5 discriminates the detection signal and outputs a signal indicating the presence / absence of paper.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile device, and more particularly to a device for detecting the presence / absence and near end of receiving roll paper with two light emitting diodes and one phototransistor.

[0002]

[Prior Art]

 Conventionally, a facsimile apparatus has been provided with a circuit for detecting the presence or absence of receiving roll paper by a microswitch or the like and determining the presence or absence of receiving roll paper. To detect the near end of the receiving roll paper, it was necessary to have a circuit that detects the near end mark printed on the receiving roll paper with a combination of a light emitting diode and a phototransistor and determines that the remaining amount of the receiving roll paper is low. Since such a conventional method requires two sets of detection circuits, the number of parts is required accordingly, and assembly is time-consuming and costly.

[0003]

[Problems to be solved by the device]

 The present invention has been made in view of the above-mentioned problems of the prior art. Two light emitting diodes and one phototransistor are used to determine the presence or absence of roll paper and the near end.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a first light emitting unit that irradiates the receiving roll paper with light for detecting the near end of the receiving roll paper, and a light receiving roll for detecting the presence or absence of the receiving roll paper. A second light emitting unit that irradiates the paper, a light receiving unit that receives the light from the first light emitting unit and the second light emitting unit, and a near end signal of the receiving roll paper is discriminated from the output signal of the light receiving unit and a near end signal is output. A first discriminating section, a drive section for sending a drive signal for driving the second light emitting section by the near end signal of the first discriminating section, and the output signal of the light receiving section for discriminating the presence or absence of the receiving roll paper and outputting a presence / absence signal. The present invention provides a facsimile machine characterized by comprising a second discriminating section for controlling the first discriminating section, a second discriminating section, and a control section for controlling the driving section.

[0005]

[Action]

 According to the above configuration, the light emitted from the first light emitting diode is reflected by the roll paper when there is roll paper and enters the phototransistor. If the roll paper has a near-end mark, the near-end mark absorbs the light and the light does not reach the phototransistor. At this time, the output signal of the first discriminating section discriminates the signal sent from the phototransistor and changes from a signal indicating that there is paper to a signal indicating near end. The driving unit sends an intermittent signal which is a driving signal for driving the second light emitting diode according to the near end signal of the first discriminating unit. The light emitted from the second light emitting diode is blocked by the paper when the roll paper is present and does not reach the phototransistor, but is incident on the phototransistor when the roll paper is exhausted. Then, the second discriminating unit outputs a signal indicating that the paper has run out.

[0006]

【Example】

 Embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing an embodiment of a fax machine of the present invention, and FIG. 2 is a cross-sectional view of essential parts of a detecting section of a facsimile machine of the present invention. In the figure, 1 is a first light emitting diode, which emits light 8. A second light emitting diode 3 emits light 8. A phototransistor 2 receives the light 8 emitted by the first and second light emitting diodes 1 and 3. A first discriminating unit 4 discriminates the output signal of the phototransistor 2 and outputs a signal indicating that there is paper or a near-end signal of paper. Reference numeral 7 denotes a drive unit, which sends an intermittent signal for driving the second light emitting diode 3 to blink the second light emitting diode 3 when the first determination unit 4 outputs a near end signal. A second discriminating unit 5 discriminates the output signal of the phototransistor 2 and outputs a signal indicating the presence or absence of paper. A control unit 6 controls the first determination unit 4, the second determination unit 5, and the drive unit 7. FIG. 2 is a cross-sectional view of an essential part of the paper detection unit, in which 1 is a first light emitting diode, 3 is a second light emitting diode, 2 is a phototransistor, and 8 is light. 10 is roll paper, and the light 8 of the first light emitting diode 1 is reflected on the surface of the roll paper 10 and is received by the phototransistor 2. A near end mark 9 is printed on a part of the surface of the end portion of the roll paper 10. The light 8 of the second light emitting diode 3 is blocked by the roll paper 10, but when the roll paper 10 is lost, the light 8 enters the phototransistor 2.

In the above configuration, when the roll paper 10 is sufficient, the light 8 of the first light emitting diode 1 is reflected on the white surface of the roll paper and is received by the phototransistor 2, and the output signal of the phototransistor 2 is It is sent to the first discriminating unit 4. The first discriminating unit 4 outputs a continuous signal indicating that the roll paper 10 is present. When the near end mark 9 appears on the roll paper 10 when the remaining amount of the roll paper 10 becomes low, the light 8 of the first light emitting diode 1 is reflected on the surface of the near end mark 9 (for example, a black near end mark is used) of the roll paper 10. Since it is absorbed, the phototransistor 2 does not receive light and the output signal of the phototransistor 2 disappears. Since the output signal of the phototransistor 2 disappears, the first discriminating unit 4 outputs a signal indicating that the roll paper 10 is near end. The driving unit 7 receives a signal indicating the near end of the roll paper 10 from the first discriminating unit 4 and outputs an intermittent signal for driving the second light emitting diode 3 to turn off the second light emitting diode 3. When the roll paper 10 is exhausted, the light (flashing light) 8 of the second light emitting diode 3 is received by the phototransistor 2 and the output signal of the phototransistor 2 is sent to the second discriminating unit 4. The second discriminating unit 4 outputs a signal indicating that the roll paper 10 is exhausted by the intermittent output signal of the phototransistor 2.

[0008]

[Effect of the device]

 As described above, in the present invention, the presence / absence of roll paper and the near end can be detected by the circuit composed of the light emitting element and the light receiving element. The number of parts is smaller than that in the case of the above, and the effects such as high reliability and cost reduction are great.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a facsimile apparatus of the present invention.

FIG. 2 is a cross-sectional view of a main part of a detection unit of the facsimile device of the present invention.

[Explanation of symbols]

 1 1st light emitting diode 2 Phototransistor 3 2nd light emitting diode 4 1st discrimination | determination part 5 2nd discrimination | determination part 6 Control part 7 Drive part 8 Light 9 Near end mark 10 Roll paper

Claims (1)

[Scope of utility model registration request] 1. A first light emitting unit for irradiating the receiving roll paper with light to detect the near end of the receiving roll paper, and a second light emitting unit for irradiating the receiving roll paper with light to detect the presence or absence of the receiving roll paper. Section, a light receiving section for receiving the light of the first light emitting section and the second light emitting section, a first determining section for determining the near end of the receiving roll paper by the output signal of the light receiving section, and outputting a near end signal, a first A driving unit for sending a driving signal for driving the second light emitting unit according to a near-end signal of the judging unit; 1 discriminator, 2nd
A facsimile device comprising a control unit that controls a discrimination unit and a drive unit.