JPH04146171A - Thermal recorder - Google Patents

Abstract

PURPOSE:To uncurl a sheet reliably through a simple structure by providing a thermal head having small radius of curvature at the leading end and disposing a paper carrying belt, with respect to the thermal head, so that a curled paper can pass through. CONSTITUTION:A vertically movable thermal head 12 is provided with a heating element at the leading end part 12a having small radius of curvature, and a paper carrying belt 13 is disposed with respect to the thermal head 12 so that a paper 11 can pass through the thermal head 12. The paper 11 fed from a roll body 10 is fed between the thermal head 12 and the paper carrying belt 13 which then carries the paper 11 in the arrow direction. Consequently, the paper 11 is subjected to a pressing force from a receiving roller 17 and a print is made thereon with the thermal head 12 contacting tightly therewith.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a thermal recording device that performs writing and recording on paper whose end portion is wound into a roll, such as in a facsimile machine or a printer.

(Prior Art) In a conventional thermal recording device, writing is performed when a sheet of paper passes between a thermal head and a platen roller placed opposite to the thermal head.

In order to cope with the use of paper whose edges are wound in a roll, a curl is added to the paper upstream in the paper transport direction relative to the thermal head to remove the curl. It was equipped with a means of bending it at a sharp angle to the opposite direction.

FIG. 6 is a configuration diagram of a printer equipped with a conventional curl removing means, in which 1 is a roll body in which paper 2 is wound, 3 is a thermal head, 4 is a platen roller, and 5 is a pair of paper ejection rollers. , 6 is a substantially V-shaped curl removal portion formed by being bent at a steep angle in the paper conveyance path between the roll body 1 and the thermal head 3.

In the figure, the paper 2 pulled out from the roll body 1 is
The curl is removed by passing through the most acutely changing part of the curl removal section 6, printed between the thermal head 3 and the platen roller 4, and discharged to the outside by the pair of paper discharge rollers 5. Ru.

(Problems to be Solved by the Invention) In the conventional device described above, the writing section consisting of the thermal head 3 and the platen roller 4 and the curl removal section 6 are provided independently and only perform their respective functions. , took up a large amount of space within the device.

Moreover, since the paper 2 has a different curvature between the outermost part of the roll body 1 and the one near the core, the strength of the curl is different, and even if the paper 2 is always bent in the opposite direction with the same strength, - However, the curling curls were not completely removed, and it could not be said that the curling curls were sufficiently removed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a heat-sensitive recording device that can remove curls in paper with a simple structure and that can reliably remove curls.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a thermal head having a small radius of curvature at the tip end, and a thermal head having an end portion that allows paper wound into a roll to pass through. and a paper conveying belt installed against the roll portion of the paper, further comprising an outer diameter detecting means for detecting an outer diameter of the roll portion of the paper, and an outer diameter data detected by the outer diameter detecting means. The present invention is characterized by comprising an adjusting means for adjusting the relative positional relationship between the thermal head and the paper conveying belt based on the above.

(Function) According to the above means, the paper is bent at a steep angle at the tip of the thermal head, and curls in the paper are removed between the tip of the thermal head and the paper conveying belt. Furthermore, recording is performed on the paper in the same area, and by adjusting the relative positional relationship between the thermal head and the paper conveyance belt depending on the outer diameter of the paper roll, the angle at which the paper is bent can be adjusted to avoid curling. It changes depending on the size of the outer diameter of the roll portion, which is related to the strength, and the curl removal is performed according to the strength of the curl.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a block diagram of main parts of the embodiment of FIG. 1, and FIG. 3 is a block diagram showing adjustment means of the embodiment. A roll body in which paper 11 is wound into a roll; 12 is a vertically movable thermal head having a heat generating element in a portion with a small radius of curvature at the tip 12a; 13 is a vertically movable thermal head that
14.15.
Reference numeral 16 denotes three rollers provided to support and move the paper conveying belt 13. The tip 12a of the thermal head 12 is located between the two rollers 14 and 15, and the other One roller 16 is movable up and down and is located below facing the thermal head 12, and the three rollers 14 to 16 support the paper conveying belt 13 in a substantially triangular shape. Further, I7 is a roller that can move up and down to receive the tip 12a of the thermal head 12 via the paper conveying belt 13, 18 is a pair of discharge rollers, and 19 is a roller body for detecting the outer diameter of the roll body 10. The outer diameter detection means is composed of a rotating member 20 that comes into contact with the outside of the rotating member 10, and an angle sensor 21 that detects the rotation angle of this rotating member 20.

In FIG. 3, reference numeral 22 denotes a moving mechanism 23 which is an adjusting means for vertically moving the thermal head 12, the roller 16, and the bearing roller 17 to adjust their relative positional relationship.
is a servo motor driver that drives the moving mechanism 22;
Reference numeral 24 denotes an arithmetic processing unit that calculates the distance traveled by the moving mechanism 22 based on the detection data from the outer diameter detection means 19 and sends a control signal to the driver 23.

Next, the operation of the above embodiment will be explained.

The paper 11 pulled out from the roll body 1O is sent between the thermal head 12 and the paper conveyance belt 13, and is conveyed by the paper conveyance belt 13 in the direction of the arrow in FIG. Printing is performed while being in close contact with the thermal head 12 under pressure. At this time, the thermal head 12
The paper 11 is bent at a sharp angle in the direction opposite to the direction in which the curls are formed by the leading end portion 12a, thereby removing the curls.

FIG. 4(a) shows a state in which the outer diameter of the roll body 10 is large, and FIG. 4(b) shows a state in which the outer diameter of the roll body 10 is small. If the paper 11 has a weak curl and the outer diameter is small, the paper 11 will have a strong curl.

Therefore, in this embodiment, a change in the outer diameter of the roll body 10 is detected as a change in the rotation angle of the rotating member 20 by the angle sensor 21, and the arithmetic processing section 24 moves the thermal head 12 and the roller 16 to adjust their positions. A servo motor driver 23 that drives the mechanism 22 is controlled.

FIGS. 5(a) and 5(b) are explanatory diagrams of specific examples of position adjustment. When it is determined that the winding is weak as shown in FIG. 4(a), the The moving mechanism 22 is operated to increase the distance between the thermal head 12 and the roller 17, and the tip portion 12a of the thermal head 12 is moved.
and a paper conveyance belt 13 formed by the paper conveyance belt 13.
The bending angle θ is increased, and the curl removal force applied to the paper 11 is decreased.

Further, if it is determined that the winding curl is strong as shown in FIG. 4(b), the thermal head 12 and the receiver are moved by a moving mechanism to reduce the distance between them and the rollers 17 as shown in FIG. 5(b). 22 is operated to reduce the bending angle θ of the paper conveyance belt 13 formed by the tip 12a of the thermal head 12 and the paper conveyance belt 13, and to increase the curl removal force applied to the paper 11.

Therefore, the bending angle of the paper 11, which is bent in the opposite direction to the direction of the curl, can be changed depending on the strength of the curl of the paper 11, and proper curl removal can be performed.

Furthermore, the curl removal and printing of the paper 11 are performed in the same area, and space can be saved compared to the conventional apparatus.

(Effects of the Invention) As explained above, according to the present invention, paper curl removal and printing are performed between the thermal head and the paper conveyance belt, and the configuration is simplified and space is saved. Furthermore, since curling is removed according to the strength of curling of the paper, it is possible to provide a thermal recording device in which curling can be reliably removed.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the photosensitive recording apparatus of the present invention, FIG. 2 is a block diagram of main parts of the embodiment of FIG. 1, and FIG. 3 is a block diagram showing adjustment means of the embodiment. Figure 4 (a), (b
) is an explanatory diagram of changes in the outer diameter of the roll body, Fig. 5(a),
(b) is an explanatory diagram of position adjustment, and FIG. 6 is a configuration diagram of a printer equipped with a conventional curl removing means. DESCRIPTION OF SYMBOLS 10... Roll body, 11... Paper, 12... Thermal head, 12a... Tip part of the thermal head, 1
3...Paper conveyance belt, 19...Outer diameter soil stacking means, 2
2...Adjustment means. Patent applicant Rico Co., Ltd. −

Claims (2)

[Claims] (1) A thermal head having a small radius of curvature at its tip, and a paper conveyance belt installed in relation to the thermal head so that the end of the paper can be passed through. Heat-sensitive recording device. (2) Adjusting the relative positional relationship between the thermal head and the paper conveyance belt based on outer diameter detection means for detecting the outer diameter of the roll portion of the paper, and outer diameter data detected by the outer diameter detection means. 2. The heat-sensitive recording apparatus according to claim 1, further comprising an adjusting means for adjusting the temperature.