JPS6143336Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying machine that detects an optical signal from an image of a subject to be copied using a line sensor and records the output on recording paper wound on a rotating drum.

Conventionally, electrostatic electrophotography has been used to copy three-dimensional images of objects such as books. This method allows for high-speed and clear recording, and is currently widely used for office purposes.

However, this electrostatic electrophotography method requires complicated, large-scale, and expensive equipment, and is not suitable for personal use such as home use or portable use.

The present invention provides a small, inexpensive copying device suitable for home use and portable use. This will be explained in detail below using the drawings.

Figure 1 shows an example of the configuration of a conventional small-sized home-use copying device. It consists of a plate 2A and a detector 2B. 3 is a line sensor, 4 is a motor, 5 is a lens, 6 is a subject, 7 is an amplifier, 8 is a recording needle, and 9 is a sub-scanning system consisting of a lead screw 9A and a nut 9B.

The recording rotary drum 1 (hereinafter referred to as drum) and the disk 2A are coaxially rotated by a motor 4.
A recording paper 1A is wound around the drum 1. The line sensor 3 is a sensor with a linear configuration of optical signals, and its scanning is performed by clock pulses. The recording paper 1A wound around the drum 1 is, for example, an electrically conductive thermosensitive recording paper. A recording needle 8 in contact with this surface is attached to a nut 9B of a scanning system 9, and is moved in the vertical direction of the drum 1 by rotation of a lead screw 9A. The line sensor 3 linearly detects the image of the subject 6 using the lens 5. The output signal of the line sensor 3 is scanned by a clock pulse, sequentially applied to an amplifier 7, amplified, and applied to a recording needle 8. When the drum 1 is rotated by the motor 4, coloring occurs on the recording paper 1A in accordance with the voltage applied to the recording needle 8, and recording is performed. On the other hand, the pulse generating mechanism 2 also rotates at the same time, and pulses corresponding to the rotation of the drum 1 are generated from the detector 2B. Disk 2
For example, let A be colored in black and white around the periphery.
For example, a reflective photo sensor may be used as the detector 2B. When this pulse is applied to the line sensor 3, the line sensor 3 performs linear scanning, and its output is applied to the amplifier 7. Subject 6
is usually a two-dimensional object like a document, so scanning is done in two steps.
It has to be done in dimension. Among these, the first dimension is performed by linear scanning of the line sensor 3 mentioned above.
The remaining dimensions are determined by moving the position of the line sensor 3. Specifically, the installation position of the line sensor 3 is moved orthogonally to the linear scanning direction. This may also move the lens 5,
Furthermore, the line sensor 3 and the lens 5 may be moved together with respect to the object. The recording needle B corresponds to the scanning caused by the positional movement of the line sensor 3.
A sub-scanning system 9 is used to vary the height position of the
The rotation of the lead screw 9A of the scanning system 9 and the movement of the line sensor position are linked.

When the line sensor 3 is moved while the lens 5 and the subject 6 are fixed, its optical path plane is sequentially moved and the entire surface of the subject 6 can be scanned. Since the movement of the line sensor 3 and the movement of the recording needle 8 are configured to be linked, an image similar to the subject 6 can be recorded on the recording paper 1A. In other words, you can make copies.

However, in this copying device, in order to synchronize the line sensor 3 and the rotating drum 1, a mechanical mechanism (pulse generation disk 2A) is required to generate a start pulse, and it is also easy to wind the recording paper. It wasn't.

The present invention provides a novel copying apparatus that eliminates such mechanical complexity and difficulty in paper winding.

An embodiment of the present invention will be described in detail below with reference to FIG.

In the figure, reference numeral 1 denotes a recording rotating drum, which is rotated by a motor 4 at a constant speed. Recording paper 1A is wound around the recording rotary drum 1. Recording paper 1A
There is a recording needle 8 in contact with the lead screw 9A.
moves upwards as it rotates. line sensor 3
An object 6 is imaged by a lens 5, and a linear optical signal sequentially scanned by an internal clock is converted into an electric signal and applied to an amplifier 7. Amplifier 7
The output is applied to the recording needle 8, and a recording proportional to the voltage is produced on the recording paper 1A. A reflective photo sensor 2B detects reflected light from the recording paper surface and converts it into an electrical signal. When the recording paper 1A is wrapped around the cylinder 1, an overlap 1B on the edge appears on the cylinder surface, which causes an output to appear on the photo sensor 2B as a change in brightness, and if this is used to reset the scanning of the line sensor 3, the recording paper It is automatically possible to match the cut with the licensor's start. The above-mentioned reflective photo sensor is suitable for detecting changes in brightness on the surface of recording paper, but as shown in FIG. A structure in which a photodetector 102 is provided opposite thereto may also be used. In this case, a decrease in transmittance due to partial overlap of the winding ends of the recording paper is detected. Furthermore, in the above embodiment, it has been described that the recording paper is used without any processing at the edges, but the effect of the present invention is particularly effective when recording paper with processing applied to both ends of the paper is used as shown in Fig. 4. becomes even more obvious. In other words, a recording paper having colored printed lines, conductive printed lines, non-conductive printed lines, etc. applied to the edge of the recording paper is used. For colored printing, use the photo sensor described above,
A photodetector may be used, or in the case of a conductive or non-conductive printed line, a contact point as shown in FIG. 5 may be used. In conventional copying machines that do not have the configuration of the present invention, the winding end of the paper cannot be arbitrarily set, and it is necessary to align the winding end with the position determined by the mechanical mechanism for issuing the start pulse of the line sensor 3. It was difficult and cumbersome to operate. On the other hand, according to the present invention, this difficulty is solved and the end of the paper roll can be placed at any position, making the operation extremely easy.
The practical effects are great.

The mounting height position of each of the above-mentioned sensors may be any position on the same cylinder, but if it is set at the height at which the recording needle scans, there is a risk of generating false signals due to the coloring of the recorded characters (the height position of the photo sensor and photo detector) In the case of contacts), there is also the risk of creating minute scratches on the recording paper, reducing the quality of the recording results (in the case of contacts). Therefore, it is desirable to provide it at the top or bottom of the cylinder, which is outside the scanning range of the recording needle.

[Brief explanation of drawings]

FIG. 1 is a principle diagram of a conventional copying machine, FIG. 2 is a perspective view of a copying machine according to an embodiment of the present invention, and FIG. 3 is a sectional view of main parts showing another embodiment of the copying machine of the present invention.
FIG. 4 is a diagram showing an example of recording paper used in the copying machine of the present invention, and FIG. 5 is a perspective view of essential parts of another embodiment of the copying machine of the present invention. 1...Rotating drum for recording, 2...Pulse generation mechanism, 3...Line sensor, 4...Motor, 5...
Lens, 6... Subject, 8... Record, 1A... Recording paper, 1B... Stamp, 2B... Detector (photo sensor).

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A rotating drum for recording, a line sensor that linearly detects signals from a copy, and a device driven by the output of the line sensor and arranged opposite to the rotating drum for recording. a sensor provided close to the rotary recording drum for detecting the edge of the recording paper wound around the rotary recording drum, and moving the line sensor and the recording means in conjunction with each other. and means for resetting the scanning of the line sensor based on the output of the sensor for detecting the edge of the paper. (2) The copying machine according to claim 1, wherein the sensor is a reflective or transmissive photo sensor and detects overlapping or coloring of the edges of recording paper. (3) The copying machine according to claim 1, wherein the sensor is a conductivity measurement sensor and detects a conductive portion formed at the edge of the recording paper. (4) The copying machine according to claim 1 of the utility model registration claim, in which the sensor is installed outside the movement range of the recording needle.