JPS60184865A - Electrothermal transfer recorder - Google Patents

Abstract

PURPOSE:To prevent the dangers of breakage through melting or generation of smokes of an ink film from occurring due to passage of an electric current at the time of an abnormal feeding, by a method wherein an ink film feeding system is provided with a mechanism and a sensor for confirming the feeding condition of an ink film, and a transfer recording action is stopped when the ink film is not fed. CONSTITUTION:A guide roller 7 is rotatably provided, and is rotated by the ink film 2 as the film 2 is fed. A detecting disk 8 fastened to the guide roller 7 is also rotated as the ink film 2 is fed, and each of slits provided in the disk 8 is detected by the sensor 9. In the condition wherein the ink film 2 is fed normally, a signal pulse is generated by the sensor 9 at a fixed time interval. When an abnormal condition is generated in feeding the ink film 2, the width of the signal pulse from the sensor 9 is enlarged. The change in the signal pulse width is read by a controlling part 12 such as a microprocessor, and supply of source power to a recording head 6 is interrupted by a switch 13.

Description

[Detailed Description of the Invention] <Field to which the invention pertains> The present invention relates to a current-carrying thermal transfer recording device, and particularly to a current-carrying thermal transfer recording device that ensures device protection and safety by checking the state of ink film transport during transport of the ink film. Regarding equipment.

<Prior Art> In an electric thermal transfer recording device, a recording head is brought into close contact with a conductive layer of an ink film, and electricity is applied to generate heat, melting the ink layer and transferring it onto recording paper to obtain a desired recording. Ink films are required to be as thin as several tens of micrometers in terms of thermal conductivity and resolution. In this way, the ink film generates heat when electricity is applied to the conductive layer, and since it is thin, if the same part of the ink film is continuously energized for more than a certain period of time, the ink film will partially become hot, melt, and even emit smoke. Although it is dangerous, it is necessary to carry out electrical thermal transfer recording under reliable transport conditions of the ink film. In conventional electrical thermal transfer recording apparatuses, there is no appropriate means for checking the conveyance state of the ink film during electrical thermal transfer recording, and there is a risk that the ink film may melt or emit smoke.

<Object of the Invention> The entire purpose of the present invention is to check the conveyance state of the ink film and to eliminate the danger of the ink film being fused and causing smoke due to the application of electricity to the ink film in the event of abnormal conveyance.

<Characteristics of the Invention> The present invention includes a mechanism and a sensor for checking the conveyance state of the ink film by engineering the ink film conveyance system.
However, if the ink film is not transported,
v11. The entire feature is that the thermal transfer recording stops working.

<Structure of the Invention> The present invention will be explained based on the drawings. FIG. 1 shows an embodiment of the present invention, in which 1 is an ink film supply roll;
2 is an ink film unraveled from the supply roll 1; 3 is a guide roller for guiding the ink film 20; 4 is a recording paper for forming characters or symbols by transfer on the opposite surface of the ink film 2; 5 is a recording paper A platen roller 4 also serves as a conveyance means, and a platen roller 6 carries the recording paper 4 and the ink film 2'? 7 is a guide roller for guiding the ink film 2, and 8 is a guide roller. 9 is a sensor for detecting the rotation of the detection disk 8, 10 is a winding roller for winding the entire ink film 2, and 11 is a recording paper. 4 to platen roller 5
This is a presser roller for pressure contact.

The ink film 2 loosened by the supply roller 1 is
The take-up roller 10 is guided by the guide rollers 3 and 7.
It is wound up and transported. The recording paper 4 is pressed against the presser roller 11 and the platen roller 5, and is conveyed by the rotational force of the platen roller 5.

Also, the recording paper 4 and the ink film 2 are connected to the platen roller 5.
The recording head 6 is held between the recording head 6 and conveyed in synchronization. In the above conveyance state, the recording head 6 applies electricity to the conductive layer formed on the side surface of the recording head 6 of the ink film 2 to generate heat, and the ink 1- on the side surface of the recording paper 4 of the ink film 2 is thermally melted and transferred onto the recording paper 4 to form the desired image. Records characters, symbols, etc. Electric thermal transfer recording is carried out as described above, and the guide roller 7 is rotatably provided and is rotated by the ink film as the paper towel/film 2 is conveyed. The detection disk 8, which is fixed to the guide roller 7, also rotates as the ink film is conveyed, and the sensor 9 detects each slit on the detection disk 8.

FIG. 2 is a block diagram of a control system in an embodiment of the present invention.

Now, when the ink film 2 is being transported normally, signal pulses from the sensor 9 are generated at regular time intervals, but if an abnormality occurs in the transport of the ink film 2, the signal pulse width becomes large.

This change in signal pulse width is read by a control unit 12 such as a microprocessor, and the power supply to the recording head 6 is cut off by a switch 13. 1, it may be used as a switch means such as a gate to cut off the signal application t' to the head driver 14 without completely cutting off the power supply.

<Effects> As explained above, by providing the ink film transport system with a simple mechanism for detecting ink film transport abnormality, it is possible to activate the current conduction heat transfer function in the event that an ink film transport abnormality occurs during current conduction thermal transfer recording. This prevents dangers such as melting of the ink film and smoke generation.

[Brief explanation of the drawing]

FIG. 1 is a side view of the main parts of an embodiment of the invention, and FIG. 2 is a block diagram of the invention.

Claims (1)

[Claims] A recording head having a current-carrying terminal is brought into close contact with a sheet-shaped ink film provided with a conductive layer and an ink layer, and electricity is selectively applied to the conductive layer to generate heat, thereby thermally melting the ink on the ink film and printing it on the recording paper. In an apparatus for recording required characters or symbols, etc., a guide roller that engages with the ink film and rotates as the ink film is transported;
1. An energization sensing device characterized by comprising: a means for converting the electric signal into a common sense, a control means for monitoring the electric signal, and a switch means for cutting off power supply or signal application to the recording head by the control means. Thermal transfer recording device.