JPS58108175A - Prevention of hot bonding of recording paper to heat-sensitive recorder - Google Patents

Abstract

PURPOSE:To prevent the hot bonding of a recording paper to a recording head by a method in which a heat-sensitive recording paper existing between a platen roller and a heat-sensitive recording head is moved, after the ending of recording operation, until the temperature of the head is lowered to belw the melting temperatures of a color forming agent binder. CONSTITUTION:A heat-sensitive recording paper 3 formed by providing a heat- sensitive layer 3d coated with a chromogenic agent 3b and a binder 3c on a base paper 3a is provided between a platen roller 1 and a heat-sensitive recording head 2, and recording is made. After the recording operation, the recording paper 3 is reciprocally moved by turning the platen roller 1, for example, during which the temperature of the recording head 2 is lowered to below the melting temperature of the binder 3c, whereby preventing the hot bonding between the recording paper 3 and the head 3 due to the melting of the binder 3c and also smoothening as well as speeding-up the start of the next recording operation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing recording paper fusing in a thermal recording apparatus.

The thermal recording method is used in facsimile machines, printers, and the like. This recording mechanism, as shown in Figure @1,
Thermal recording paper 3 is placed between the platen roller l and the thermal recording head 2.
The mosquito recording paper is conveyed by the platen roller 1 while printing is carried out on the recording paper 3 by the alignment head 2. Such a printing principle is based on the recording paper 3, which is a base paper 3a with a heat-sensitive layer of about 100 yen, for example, a coloring agent 3b consisting of an electron donating component and an electron accepting component, which is bonded and applied with a binder 3C. Using the formed recording paper 3, heat is applied to the recording paper 3 by the heating element 2a, thereby melting both the coloring agents 3b and causing an ion exchange type electron transfer reaction, thereby causing the corresponding portion to develop color. be.

In a thermal recording device employing such a printing principle and recording mechanism, the temperature of the recording head 3 gradually rises as the recording operation continues, and the body temperature does not immediately drop after the recording operation is completed. Therefore, if the temperature of the recording head 3 is equal to or higher than the melting temperature of the binder 3C after the recording operation is finished, that is, when the conveyance of the recording paper 3 is stopped, the binder 3C is melted, and as the temperature decreases, the binder 3C is melted. The recording head 2 and the recording paper 3 are in a bonded state, and at the start of the next recording operation, the recording paper 3 is rotated by the platen 21 as shown in FIGS. 2(a), (b), and (e). As a result, there is a possibility that the printer will be in a folded state and normal recording operation will not be possible.

In order to solve this problem, the present invention provides a method for preventing recording paper from fusing in a thermal recording device. After the recording operation is finished, remove the recording paper.
The purpose is to move the recording head until the mJ[ of the recording head becomes equal to or less than the melting of the binder on the recording paper.

The present invention will be described below with reference to embodiments shown in the drawings. The recording paper fusion prevention method in a thermal recording apparatus according to the present invention is such that the thermal recording paper 3 interposed between the platen roller 1 and the thermal recording head 2 is fixed to the temperature of the recording head 2 after the recording operation is completed. Melting im of binder 3c on recording paper 3
The purpose is to move the object until it becomes less than or equal to z. In the example,
A step motor 4 is used as a drive motor for the platen roller 1.
The motor is controlled by inputting the recording operation end signal a, for example, the DCN signal (line disconnection signal) to the fllJ control circuit 5, and outputting the forward rotation I# pulse signal or reverse rotation signal from the control circuit 5. step motor drive circuit 6
, thereby causing forward and reverse rotation. Therefore, the recording paper 3 on the platen roller 1 repeatedly moves forward and backward as the platen roller 1 rotates. This operation is performed by the control circuit 5
A timer is set in the recording head 2 for a certain period of time.
[1&] is continued for a sufficient period of time until the temperature falls below the melting temperature of the binder 3c on the recording paper 3, and then it is stopped.

As described above, in the method for preventing recording paper fusing in a thermal recording apparatus according to the present invention, the thermal recording paper interposed between the platen roller and the thermal recording head is heated to the temperature of the recording head after the recording operation is completed. Since the recording paper is moved until it becomes below the melting temperature of the binder, thereby preventing the recording paper and the recording head from fusing, for example, after the recording operation is completed, the recording head is separated from the recording paper and the recording paper is moved. Compared to methods that prevent fusion with the recording head, there is no need to keep a distance between the recording head and the recording paper, the apparatus becomes a conductor, and the next recording operation can be started quickly and smoothly.

[Brief explanation of drawings]

Fig. 1 is an enlarged sectional view of the main part conceptually showing recording St in a thermal recording device, Fig. 2 (older sister, (b), (C)
3 is an explanatory diagram showing an abnormal paper feeding operation in a conventional thermal recording apparatus, and FIG. 3 is a block diagram of a motor drive circuit for carrying out the method according to the present invention. 1...Platen roller, 2...Thermal recording head, 3
・・・Thermal recording paper, 3b ・・・Coloring agent, 3c-・
・Binder, 4...Step motor, 5-...Control circuit, 6...Step motor drive circuit, Hatake...Recording operation end signal, b...Forward rotation/f pulse signal, c...
Reverse nonalus signal.

Claims (1)

[Claims] (1) The thermal recording paper interposed between the platen roller and the thermal recording head is moved while the temperature of the recording head is appropriately cooled to mu after the recording operation is completed. A method for preventing recording paper fusing in a thermal recording device, characterized by: ■) The above recording paper was moved back and forth.
-** A method for preventing fusing of recording paper in a thermal recording apparatus according to claim (1). (3) The scope of claim 1 is that the recording paper is moved by rotation of a platen roller! (1) Stacking or folding (Method for preventing recording paper from fusing in a thermal recording device described in 4 tombs. (Ship) The movement of the recording paper was started by a recording operation end signal and stopped after a certain period of time by a timer. Claims U) or C) or Claims characterized in that