JPS5968286A - Multicolor printing recorder - Google Patents

Abstract

PURPOSE:To prevent wrinkles from being generated and obtain a clear printed image, by imparting a fixed tension to a transfer ribbon by a brake gear, in a multicolor printing recorder using a transfer ribbon. CONSTITUTION:The transfer ribbon 6 wound around a ribbon holder 8 in a roll form is applied with a tension between the holder 8 and a thermal head 4 by the brake device 10 fitted to a left side surface of the holder 8. The brake gear 10 comprises a magnetic brake, an output shaft thereof is connected to a rotary shaft, and on the basis signals S1, S2, S3 fed in accordance with the feeding mode of the ribbon 6, namely either feeding of only a paper 1 or feeding of both the ribbon and the paper 1 (in printing) or feeding of only the ribbon, driving circuits 12, 13, 14 are turned ON or OFF, whereby the braking force of the brake gear 10 is controlled to be either of maximum, medium and minimum.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multicolor printing/recording device that forms a color image on printing paper using a transfer ribbon coated with a plurality of inks, and particularly relates to a multicolor printing and recording device that forms a color image on printing paper, and in particular, it is capable of producing clear printing without uneven transfer. This invention relates to a multicolor printing and recording device that can print and record in multiple colors.

FIG. 1 is a schematic diagram showing the configuration of a printing section of a conventional multicolor printing and recording apparatus, and in the figure, l represents a printing section (hereinafter abbreviated as paper). The paper 1 is conveyed via the guide sprocket 2 to the platen roller 8 provided on the left side of the figure, and is brought into contact with the lower outer circumferential surface of the platen roller 8 while passing through the gap formed between the platen roller 8 and the thermal head scratches. 5
and is carried out in the direction of arrow a in the figure. On the other hand, on the right side of the guide sprocket 2, a transfer ribbon 6 wound into a roll is provided. The transfer ribbon 6 is made of paper or resin paste on which ink of three colors yellow, magenta, and cyan is applied alternately in strips. 5, and at the point where it passes through gap 5, m paper l
It is separated and seen by the end-of-life m reel 7.

In such a configuration, when printing is started and a pulsed Inkihakugo (printing f-ta) is supplied to the thermal head, the thermal head scratch generates heat and melts the ink on the transfer ribbon 6, causing the paper to melt. Perform color transfer on l.

By the way, in the above-mentioned conventional multicolor printing and recording apparatus, in the process of dissolving the ink on the transfer ribbon 6,
Wrinkles occur on the ribbon due to thermal changes, and due to the effect of the wrinkles, the transfer ink is not transferred sufficiently, resulting in a small area α that cannot be transferred at all to the poem, which has the disadvantage that a clear image cannot be obtained.

Particularly when the printed image is circular or partially rolled, wrinkles occur significantly, degrading the image quality.

This invention has been made in view of the above circumstances, and provides a multicolor printing and recording device that can prevent wrinkles by applying a constant tension to a transfer ribbon, thereby obtaining a clear printed image. The purpose is to

Hereinafter, the present invention will be described in detail based on the drawings.

FIG. 2 is a schematic diagram showing the configuration of an embodiment of the present invention, and FIG. 3 is a view taken along the line III-IIT in FIG. In these figures, the same reference numerals are given to the parts corresponding to those in FIG. 1, and the explanation thereof will be omitted. In FIGS. 2 and 3, 8 is a ribbon holder that supports the rotating shaft 9 of the transfer ribbon 6 wound in a pull-like shape, and a brake device fR10 is attached to the left side of this ribbon holder 8. ing. The output shaft of this brake device [10] is connected to the rotation MJ9, and applies a constant tension to the transfer ribbon 6 stretched between the ribbon holder 8 and the thermal head scratch. As a result, the transfer ribbon 6 is stretched tightly, and wrinkles do not occur in the transfer ribbon 6 during printing. Therefore, the above-mentioned main portion is removed, and a clear printed image can be obtained.

Next, if an electromagnetic brake is used in the brake device 1O and the drive is controlled by the brake control circuit shown in FIG.

In other words, the conveyance mode of the transfer ribbon 6 is such that when the transfer ribbon 6 is conveyed together with paper m (during printing, etc.), when only the ribbon 6 is conveyed without falling (when the transfer ribbon 6 is aligned), ), stop the transfer ribbon 6 and place the paper 1
A toothpick that conveys only paper (such as when feeding paper 1)
However, when only mtCl is transported, the braking force of the brake device 10 is increased to prevent the transfer ribbon 6 from being carried along, while when only the transfer ribbon 6 is transported, the braking force of the brake device 10 is increased. It is desirable to weaken the power. The braking force of the brake device 10 is controlled in this way by the μth
The brake control circuit shown in the figure is an electromagnetic brake excitation coil 11, one end of which is connected to the supply end of the positive voltage Vcc, and the other end of the drive circuit 12.
18,141. Here drive circuit 1
2 consists of a transistor 12a, the drive circuit 18 consists of a series circuit of a diode 18ct resistor 18b) a transistor 18a, and the drive circuit 14 consists of a diode 18
It consists of a series circuit of a C1 resistor 18b, a diode 14C2 resistor 14b, and a transistor 14H. The base of the transistor 12a is connected to the base of the transistor 12a while only the paper 1 is being conveyed.
The signal S1 that becomes H level is connected to the base of the transistor 18a, and the signal S that becomes 1H'' level during printing.

However, a signal Ss which becomes "H" level while only the transfer ribbon 6 is being conveyed is supplied to the base of the transistor 14H, turning on the drive circuits 11, 18, and 14.

Turn off and turn on and off the excitation coil/I/11. Note that reference numeral 15 in Fig. 1 is a diode for absorbing back electromotive force generated when the excitation coil 11 is turned off. In such a configuration, when the drive circuits 12, 18, 14 are turned on, the currents 112, 112, . Ill
e I14, as can be easily seen from Fig.
> 11s > 114, the braking force of the magnetic brake is maximum while only 1 & 1 is being transported, medium during printing, and minimum while only transfer ribbon 6 is being transported.

As a result, it is possible to prevent the transfer ribbon 6 from being dragged along and wasted while the paper is being conveyed by 1 m. Furthermore, when only the transfer ribbon 6 is transported, its tension is weakened and winding is performed smoothly. By controlling the braking force of the electromagnetic brake in this way, the transfer ribbon 6
can be kept in good condition at all times. Also, the current 11
By controlling 2 to 114, power can be used more effectively and it is also useful for energy saving.

As explained above, in the present invention, since a constant tension is applied to the transfer ribbon by the brake device, it is possible to prevent the occurrence of wrinkles, and it is possible to perform clear printing by kneading. Further, since an electromagnetic brake is used as the brake device to apply an optimum tension depending on the transport mode of the transfer ribbon, wasteful feeding of the transfer ribbon can be prevented.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of the configuration of a conventional multicolor print/recording device, FIG. 2 is a schematic diagram showing an example of the configuration of an embodiment of the present invention, and FIG.
The figure is a view taken along the river-■ line in FIG. 2, and the figure is a circuit diagram showing the configuration of a brake control circuit that controls the current supplied to the electromagnetic brake. 6... Transfer ribbon, 9... Rotating shaft, l
O...Brake device.

Claims (1)

[Scope of Claims] Z A multicolor printing and recording device characterized in that an output shaft of a brake device is connected to the rotating shaft of a transfer ribbon wound into a roll to apply a constant tension to the transfer ribbon. flT. 2. The multi-color printing and recording device according to item 1 of the scope of claim 1, wherein the brake device is an electromagnetic brake. 3. A brake control circuit that changes the current supplied to the electromagnetic brake according to the transport mode of the transfer ribbon, thereby controlling the braking force of the electromagnetic brake. 2. The multicolor printing and recording device according to item 2.