JPH03121875A - Recording apparatus - Google Patents

Abstract

PURPOSE:To prevent the damage of a heating resistor by covering the heating resistor with a protective cover at a time other than the operating time thereof to protect the same. CONSTITUTION:In such a state that a platen roller l is in contact with a thermal head 2, the lock pin 15 of an opening and closing body 13 is engaged with the hook part 14a of a lock lever 14 and the opening and closing body 13 is in a closed state and an operating part 13a pushes the loft upper end part of a protective cover 7 to rotate the protective cover 7 in a clockwise direction and a heating resistor 6 receives the elastic force of an energizing spring 10 to come into contact with the platen roller 1 through recording paper 11a. When the engagement of the lock pin 15 and the hook part 14a is released, the operating part 13a rises by the revolution of the opening and closing body 13. Whereupon, the platen roller 1 and the thermal head 2 are separated each other and the protective cover 7 is rotated in the clockwise direction by the tensile force of a tensile spring 9 and comes into contact with the left lower end of an Al support 3 to stop its rotation. In this state, the protective cover 7 covers the leading end part of the thermal head 2 containing the heating resistor 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a recording apparatus equipped with a thermal head provided with a heating resistor at its end.

(Prior Art) FIG. 6 is a side view showing a conventional end-type thermal head in which a heating resistor is provided at the end or near the end.
21 is an aluminum (A12) support, 21 is a ceramic substrate, 22 is a heating resistor provided at the left end of the ceramic substrate 21, 23 is a printed circuit board, and 24 is an electrical connection between the ceramic substrate 21 and the printed circuit board 23. The wire bonding section 25 is a head cover that covers the printed circuit board 23, the wire bonding section 24, and a part of the ceramic substrate 21.

FIG. 7 is a side view showing a conventional planar thermal head in which a heating resistor is provided on the flat surface, and members corresponding to those explained in FIG. 6 are given the same reference numerals. 22 is provided approximately at the center of the plane of the ceramic substrate 21.

In FIGS. 6 and 7, the row-shaped heating resistors 22 selectively generate heat based on data input to the printed circuit board 23 to perform a recording operation on recording paper (not shown).

In recent years, edge-type thermal heads have come into use because they have the advantages of improved image quality, lower cost, and smaller size than planar thermal heads.

(Problem to be Solved by the Invention) However, in a flat thermal head, since the heating resistor 22 is provided on the flat part of the ceramic substrate 21,
As long as the heating resistor 22 is not damaged by a sharp object, the heating resistor 22 will not be damaged even if it is handled roughly. If it comes into contact with an object, it may be easily damaged.

An object of the present invention is to provide a recording device that can protect a heating resistor and prevent damage to the heating resistor.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a thermal head that records on a recording paper by generating heat from a heating resistor provided at an end, and a thermal head that is pressed into contact with the thermal head. In a recording apparatus equipped with a platen roller that conveys the recording paper, the heating resistor is coated near the heating resistor when the thermal head and the platen roller are separated, and the heating resistor is coated near the heating resistor when the thermal head and the platen roller are separated. It is characterized in that a protective cover is provided so as to release the covering of the heating resistor when the heating resistor is pressed into contact with the heating resistor.

(Function) Since the above means is adopted, the protective cover covers and protects the heating resistor except when the heating resistor is activated.

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

1(,) to (C) are sectional views showing each operating state of the first embodiment of the recording apparatus of the present invention, and FIG. 2 is a perspective view showing the thermal head used in the first embodiment. 1 is a platen roller, 2 is an AI2 support 3° and a ceramic substrate 4
．． A thermal head 6 consisting of a head cover 5 etc.
A heating resistor 7 provided at the end of the ceramic substrate 4 or an end near the end (upper left end in this embodiment) is an Aff
An abbreviated protection force bar 9 has one end rotatably provided on a receiving part 8 provided on the lower side of the support 3 and the other end covers the heating resistor 6; 10 is a spring that urges the thermal head 2 in the direction of contact with the platen roller 1; 11 is a roll made of thermal recording paper 11a; 12 is the thermal head 2;
13 is an opening/closing body that supports the platen roller 1 and is rotatably provided on the substrate 12;
13a is an actuating part that is provided on the lower side of the opening/closing body 13 and comes into contact with one end of the protective cover 7; 14 is a lock lever that is rotatably provided on the base plate 12 and has a hook part 14a at its tip; 15 is a lock pin that is fixed to the opening/closing body 13 and is detachable from the hook portion 14a of the lock lever 14; I6 is a spring that acts to maintain the engagement between the lock pin 15 and the hook portion 14a. .

FIG. 1(a) shows a state in which the platen roller 1 and the thermal head 2 are in contact with each other, and the lock pin 15 of the opening/closing body 13 is shown in FIG.
is engaged with the hook portion 14a of the lock lever 14, the opening/closing body 13 is in the closed state, and the actuating portion 13a pushes the upper left end of the protective cover 7 to rotate the protective cover 7 clockwise, and the heating resistor 6 is in contact with the platen roller 1 via the recording paper 11a under the elastic force of the biasing spring 10. In this state, one heating resistor 6 selectively generates heat to perform recording on the recording paper 11a.

FIG. 1(b) shows the state when the lock pin 15 and the lock lever 14 are unlocked. In order to replace the roll 11 or remove jammed paper, the lock lever 14 is pushed against the spring 16 by an appropriate means. When the lock pin 15 and the hook portion 14a are rotated clockwise to release the engagement between the lock pin 15 and the hook portion 14a, the opening/closing body 13 can be rotated clockwise, and the rotation of the opening/closing body 13 causes the actuating portion 1.3a to be activated. Rise. Then, the platen roller 1 and the thermal head 2 are separated, and the protective cover 7 is rotated clockwise by the tensile force of the tension spring 9 and stops rotating when it comes into contact with the bobbin thread end of the A(i support 3). In this state, the protective cover 7 covers the tip of the thermal head 2 including the heating resistor 6.

FIG. 1(c) shows the open state of the opening/closing body 13. In this state, the roll 11 is replaced and the jammed paper is removed, and the thermal head 2 is exposed to the outside, but the heating resistor 6 is Since it is covered and protected by the protective cover 7, no damage will occur.

After the above-mentioned replacement and removal work is completed, rotate the opening/closing body 13 counterclockwise to release the hook portion 14 of the lock lever 14.
When a is engaged with the lock pin 15, the actuating portion 1.3a
contacts the upper left end of the protective cover 7, pulls the protective cover 7 and rotates it counterclockwise against the elastic force of the spring 9, and the heating resistor 6 is uncovered as shown in FIG. 1 (2). ]).

3(a) and 3(b) are side views showing the operation of another embodiment of the protective cover 7, in which a lock groove 8a is formed in a part of the circumferential side of the receiving part 8 provided on the thermal head 2. A long hole 8b is formed in the center of the side wall to support the rotating shaft 7a of the protective cover 7.
It has a configuration in which a locking protrusion 7b is provided on a part of the protective cover 7.

FIG. 3(a) shows the locked state of the protective cover 7, in which the locking protrusion 7b of the protective cover 7 engages with the locking groove 8a of the receiving part 8, and this engagement is held by the tension spring 9. There is. In this state, the heating resistor 6 is covered with the tip of the protective cover 7.

FIG. 3(b) shows the state in which the heating resistor 6 is used.
First, in the state shown in FIG. 3(a), pull the protective cover 7 in the direction of arrow A to release the engagement between the locking protrusion 87b and the lock groove 8a, and then remove the protective cover 7 as shown in FIG. 3(b). Push in the direction of arrow B and rotate counterclockwise around the rotating shaft 7a to release the protective cover 7 from covering the heating resistor 6.

When the pressing force indicated by arrow B is removed, the protective cover 7 rotates clockwise around the rotating shaft 7a due to the tensile force of the tension spring 9, returning to the locked state shown in FIG. 3(a).

FIG. 4 is a side view showing a second embodiment of the recording apparatus. In this second embodiment, the operating part 13a of the opening/closing body 13 is not used, and when the platen roller 1 and the thermal head 2 come into contact, the The curved tip 7c of the cover 7 is brought into contact with a platen roller with the recording paper 11a interposed therebetween. The tip 7c of the protective cover 7 that comes into contact with the platen roller 1 is made of a material with a small friction coefficient and excellent friction resistance, and this contact causes the thermal head 2 and the tip 7c to
− minutes, the conveyance force is applied to the recording paper 11a by the platen roller 1.

2, the contact area with the platen roller 1 is small, but if the contact force is increased in order to apply a conveying force to the recording paper 11a, there is a problem that the platen roller 1 becomes easily deformed. It will happen. However, as shown in FIG. 4, if a part of the protective cover 7 is brought into contact with the platen roller 1 to obtain a conveyance force from the platen roller 1 to the recording paper 11a, the thermal head 2 and the platen roller 1 can be The contact force of the platen roller 1 can be reduced, and deformation of the platen roller 1 can be prevented.

FIG. 5 is a sectional view showing a third embodiment of the recording apparatus. In this third embodiment, plain paper is used as the recording paper 11a, and an ink sheet 17 for thermal transfer is used for recording. In the figure, 18a is a supply side ink sheet roll, 18b is a take-up side ink sheet roll, and 19 is a guide roller.

In the third embodiment described above, when the platen roller 1 and the multi-head 2 come into contact with each other, the curved tip 7 of the protective cover 7
c is brought into contact with the lower surface of the ink sheet 17 at a position that does not come into contact with the platen roller 1 and is close to the take-up side ink sheet roll 18b, and the end portion 7d is brought into contact with the lower surface of the ink sheet 17 at a position that does not come into contact with the platen roller 1.
The protective cover 7 comes into contact with the Aff support 3 and restricts the counterclockwise rotation of the protective cover 7.

The tip portion 7c is made of a material with a small friction coefficient and excellent abrasion resistance, and guides the conveyance of the ink sheet 17 and abruptly changes the conveyance direction of the ink sheet 17, so that the recording paper 1. 1. The separation between the ink sheet 17 and the recording paper 11 and a is improved by preventing the ink sheet 17 from following the conveyance.

In the embodiments shown in FIGS. 4 and 5 above, the thermal head 2
When the heating resistor 6 is separated from the platen roller 1, the heating resistor 6 is covered with the protective cover 7, as in the first embodiment.

In addition, in the first embodiment, the platen roller]-opening/closing body 1
3, the thermal head 2 is provided with the substrate 12, but the platen roller 1 is provided with the substrate 12, and the thermal head 2 is provided with the opening/closing body 1.
The present invention can also be applied to the configuration provided in No. 3.

(Effects of the Invention) According to the present invention, it is possible to provide a recording device that can prevent damage to the heating resistor by covering and protecting the heating resistor with the protective cover at times other than when the heating resistor is in operation.

[Brief explanation of drawings]

FIGS. 1(a), (b), and (C) are sectional views showing each operating state of the first embodiment of the recording device of the present invention, and FIG.
Third perspective view showing the thermal head used in the example
Figures (a) and (b) are side views showing the operation of other embodiments of the protective cover, Figure 4 is a side view showing the second embodiment of the recording device of the present invention, and Figure 5 is the recording device of the present invention. A side view showing a third embodiment of the apparatus, and FIGS. 6 and 7 are side views showing a conventional thermal head. 1...Platen roller, 2...Thermal head, 3...AI2 support, 4...Ceramic substrate, 5...Head cover, 6...Heating resistor, 7...Protective cover 8... Ukebe, 9...
Tension spring, 10...Biasing spring, 11...Roll,
lla...recording paper, 12...board, 13...opening/closing body, 13a...operating part, 14...lock lever 14a...hook part, 15...lock pin, 16...spring, 17... Ink sheet, 1
9...Guide roller.

Claims (1)

[Claims] In a recording apparatus that includes a thermal head that records on recording paper by generating heat from a heating resistor provided at an end thereof, and a platen roller that conveys the recording paper by being in pressure contact with the thermal head, the heating resistor A protective cover is installed near the heating resistor to cover the heating resistor when the thermal head and platen roller are apart, and to release the covering of the heating resistor when the thermal head and platen roller come into contact. Characteristic recording device.