JPH0377788B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a color copying apparatus that copies an image such as a cathode ray tube screen onto a recording paper using a transfer paper having a dye that is transferred by applying heat.

Conventional configuration and its problems In this type of transfer type color hard copy device,
In order to obtain a single color record, a method is adopted in which transfer paper having a plurality of pigments, such as magenta, cyan, and yellow, is used to sequentially transfer the pigments. In this case, in order to match the starting edge of each color with respect to the image receiving paper, a method is adopted in which a marking is placed near the starting edge of the color on the transfer paper and this is read by a sensor provided near the thermal head.

FIG. 1 shows a conventional copying device of this type. 1
3 is a drum around which the image receiving paper 2 is wound, 3 is a transfer paper, 4 is its supply reel, 5 is a take-up reel, and 6 is a thermal head. to transfer the dye from the transfer paper to the receiver paper.

7 and 8 are sensors provided at a position away from the recording paper 9, and with these sensors,
The markings on the transfer paper 3 are read and the starting edges of a plurality of colors are made to match.

In a conventional device with such a configuration, as the drum 1 becomes larger, the sensors 7 and 8 have to be moved away from the drum. It also has the disadvantage of being a big deal.

OBJECTS OF THE INVENTION An object of the present invention is to eliminate these drawbacks and provide a compact color hard copy device by devising means for detecting the starting edge of transfer paper.

Structure of the Invention The present invention involves holding the leading edge of an image-receiving paper by a holding part provided on a part of the outer periphery of a drum, and sequentially winding the image-receiving paper around the drum from the leading edge, and applying a plurality of pigments sequentially to each surface. the color recording material is pressed against a thermal head through a transferred transfer paper, and the dye on the transfer paper is transferred to the image receiving paper multiple times to obtain a color record;
a light guide path passing through a non-wound portion of the image receiving paper on the outer periphery of the drum, which is sandwiched between the holding portion and a terminal end of the image receiving paper;
and a light detection means fixedly provided near the drum, and when the drum is at a predetermined rotational position, the light detection means passes through the light guide path to a point at which the color of the transfer paper changes or at a predetermined location. This color copying device is characterized in that it detects a cue mark.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows an outline of a transfer type color hard copy apparatus according to the present invention.

10 is a drum that holds the leading edge 12' of the image-receiving paper 12 by a holder 11, and 13 is a roller that presses the image-receiving paper against the drum. When the drum 10 rotates in the direction of the arrow in the figure, the holder 11 passes through the pressing roller 13. The following image-receiving paper 12 is tightly attached to the outer periphery of the drum by a pressing roller 13 and reaches a recording section to be described later.

14 is a transfer paper, 15 is a supply reel thereof, 16 is a take-up reel, and the image receiving paper is driven by the reel 16. 17 is a thermal head, and while this is retreating to the position indicated by the broken line in the figure, the holder 11
passes between the thermal head 17 and the drum.

When the drum 10 and the transfer paper 14 come to the recording start position, the thermal head 17 is pressed by a pressing mechanism (not shown) at the position shown by the solid line, and recording of the first color starts from here. A predetermined length of recording is continued on the image receiving paper, and the recording of the first color is completed. Thereafter, the thermal head 17 is moved back to the position indicated by the broken line, and recording is performed in several colors in the same manner as the first color, thereby completing the color recording.

As shown in FIGS. 2 and 3, an image-receiving paper 12 is held by a holder 11 and wound around the outer periphery of the drum 10, and the outer periphery of the drum 10 is slightly longer than the total length of the image-receiving paper 12. Therefore, there is a portion 10' on the outer periphery of the drum where the image receiving paper is not wound. Cutouts 18 and 18' serving as light guide paths are provided at both ends of this portion. Fourth
The drawing is a right side view of FIG. 3, and the drum 10, image receiving paper 12, and transfer paper 14 have approximately the same width. 1
9 and 19' are light emitting diodes fixed on the chassis near the thermal head 17;
0' is a photo sensor fixed on the chassis at a position where light from light emitting diodes 19, 19' enters through notches 18, 18'. The base paper of the transfer paper 14 is semitransparent and transmits light. Further, marks 21 and 21' for locating the beginning of each color are provided above it, as shown in FIG. In Figure 4, these marks 21 and 21' are located at both ends of the transfer paper.
This mark 21 or 21' is the light emitting diode 19
Alternatively, the photo sensor 20 or 20' is operated by blocking the light of 19' or by transmitting the light, and the take-up reel 16 is controlled to move the transfer paper of a predetermined color to the recording position. Set.

Also, the drum 10 is used as the third drum for detecting marks on the transfer paper.
This is done when the image receiving paper 12 is in the position shown in the figure and does not interfere with the space between the light emitting diode and the photo sensor.

In the embodiment, notches are provided at both ends of the drum 10,
Although marks are detected using each as a light guiding path, it is also possible to make the notch only on one side of the drum and detect two series of marks. Further, as shown in FIG. 6, a part of the notch can be made into a reflective surface 22, and the light from the light emitting diode can be input to the photodiode through the reflective surface 22.

In addition, in the example, the light guide path was made into a notch shape, but
A light guide path may be formed by a transparent fiber 23 as shown in FIG. 7, or a light guide path may be formed by two intersecting holes 24 and 25 and a mirror 26 provided at the intersection, as shown in FIG. It's okay.

In the embodiment, a light emitting diode is provided on the thermal head side, but a photo sensor may be provided instead. Further, although the light emitting diode is fixed to the chassis, it may be attached to the end of the thermal head 10.

Effects of the Invention As described above, in the present invention, the sensor for detecting the beginning of each color of the transfer paper on the drum is arranged through the notch at the end of the drum, so there is no obstacle in the travel path of the transfer paper. Therefore, since the take-up reel and supply reel required for the transfer paper can be placed as close as possible, the entire device can be made smaller, and along with this, it is easier to achieve precision between the two reels. It also has the advantage that the cartridge can be made smaller when used.

[Brief explanation of drawings]

FIG. 1 is a principle diagram of a color hard copy device in a conventional example, FIGS. 2 and 3 are principle diagrams of a color hard copy device in an embodiment of the present invention, and FIG.
The figure is a side view of the main part showing a part of the device in cross section, FIG. 5 is a plan view of the markings on the transfer paper used in the device, and FIGS. FIG. 2 is a side view showing a portion of the color hard copy device in cross section. 10...Drum, 11...Holder, 12...
Image receiving paper, 14...Transfer paper, 17...Thermal head, 10'...Unwound portion of image receiving paper, 18, 18'...
Notch, 19, 19'... Light emitting diode, 20,
20'...Photo sensor.

Claims (1)

[Claims] 1. The leading edge of the image receiving paper is held by a holding part provided on a part of the outer periphery of the drum, and the image receiving paper is sequentially wound around the drum starting from the leading edge. Alternatively, the thermal head is pressed through a transfer paper having a mark indicating the position of a specific color, and the dye on the transfer paper is transferred to the image receiving paper multiple times to obtain a color record, and the holding section and the image receiving paper are connected to each other. a light guide path passing through a non-wound portion of the image receiving paper on the outer periphery of the drum sandwiched between the end of the paper; and a light guide path fixedly provided near the drum and provided via the light guide path and a part of the recording paper. and a light detection means, wherein the light detection means detects the position of the mark on the transfer paper via the light guide path when the drum is at a predetermined rotational position. Device.