JP2760238B2 - Self-propelled print head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-propelled print head, and more particularly, to a self-propelled print head which self-propelled on a printing paper.

[0002]

2. Description of the Related Art FIG. 3 is a structural view showing an example of a conventional printing mechanism. Referring to FIG. 3, the print head 211 fixed to the circular belt 221 includes a circular belt 221.
Are moved in the horizontal direction by the rotation of the step motor 222, and the position in the horizontal direction is determined by the number of pulses given to the motor 222. The print head 211 is a steel shaft 2 for moving the print head 241 in parallel with the printing surface of the printing paper 241.
23. The roller 231 around which the printing paper 241 is wound moves the printing paper 241 in the vertical direction by a step motor 232 to which a pulse is applied.

At this time, in the dot impact system and the thermal transfer system, the printing pressure is determined by the interval between the print head 211 and the printing paper 241. In the system in which the ink particles are blown out, printing is performed using a plurality of fan-shaped ink pipes. The print target paper 241 is placed at a predetermined position of the head 211.
Is a factor that greatly affects the print quality. Further, since the support position is provided at both ends of the maximum size of the print-receiving paper 241 that is equal to or larger than the width, the guide shaft 2
The parallelism and the uniformity of the distance between the center line 201 of the roller 23 and the center line 202 of the roller 231 affect the printing pressure and printing quality during printing. For example, in the case of horizontal printing on A3 paper, the distance between the support positions of the guide shaft 223 is about 40.
cm, and the guide shaft 223 needs a weight to secure strength for maintaining parallelism. Also,
The surface processing accuracy causes play between the print head 211 and print quality. The same applies to the roller 231 and the surface processing accuracy of the outer periphery of the roller 231. These factors become disadvantageous as the size of the paper handled increases.

[0004]

In this conventional printing mechanism, it is necessary to have a heavy structure in order to keep the interval between the print head and the printing paper constant. Is required, which results in high manufacturing costs.

[0005]

SUMMARY OF THE INVENTION A self-propelled print head according to the present invention has a printing means for printing on a paper to be printed placed on a two-dimensional plane, and a variable suction strength for changing the printing pressure of the printing means. Control means, and moving means for self-propelling the printing means and the control means on the two-dimensional plane.

Further, the self-propelled print head of the present invention is characterized in that it prints on the printing target paper placed horizontally.

Further, the self-propelled print head of the present invention is characterized in that the control means is a flat suctioned means provided on the back of the printing paper.

Further, the self-propelled print head according to the present invention is characterized in that the printing means is a printing means which scans horizontally or vertically when printing one character.

Further, in the self-propelled print head according to the present invention, the moving means may be arranged so that the moving means is moved in both directions with respect to the first direction of the two-dimensional plane and is moved with respect to a direction perpendicular to the first direction of the two-dimensional plane. It is movable in the direction.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a conceptual diagram showing the operation of one embodiment of the present invention, and FIG. 2 is a structural view of the self-propelled print head of this embodiment viewed from below.

Referring to FIG. 1, a self-propelled print head 100 according to this embodiment includes a printing paper 141 placed on a flexible mat 171 having a structure in which a material attracted by a magnetic field, for example, soft iron is adhered to the surface. It is put on.
The self-propelled print head 100 has a structure that runs around the print target paper 141.

Referring to FIG. 2, a self-propelled print head 100 of this embodiment is entirely housed in a frame 103, and a print head 111 is disposed on a printed circuit board 161 including control ICs 162 and 163. And X
A step motor 122 for directional drive, a step motor 132 for Y direction drive, rollers 121 and 131 having a structure in which the print head 111 is moved in contact with the printing target paper by a frictional force and rotated left and right around the shafts 101 and 102; A motor 142 for driving a rod 143 for applying force;
It comprises balls 120 and 130 that rotate in any direction, and electromagnets 151 and 152 that can control a magnetic field generated by a current flowing through the coil. FIG. 2 shows the motor 1
42 shows a state in which the rod 143 is pressed, and the rotation of the Y-direction stepping motor 132 causes the rotation of the roller 131 in contact with the shaft, thereby causing the frame 103 to rotate.
Moves in the Y direction. At this time, the roller 12 freely rotates.
The print head 111 supported by the print head 111 and the balls 120 and 130 has an electromagnet 151 that can control the strength of the magnetic field acting on the mat 171 by the strength of the current in order to maintain a predetermined distance from the print target paper 141 in FIG. 152. When the self-propelled print head 100 is too heavy, the printing pressure can be reduced by operating the electromagnets 151 and 152 by forming the mat 171 as a mat including a polar permanent magnet in the vertical direction. In order to move the frame 103 in the X direction, first, the motor 142 is operated, the rod 143 is pulled, the roller 131 is rotated with respect to the shaft 102, and the frame is pulled off from the shaft of the Y-direction driving step motor 132. At this time, the roller 121 also rotates at the same time and contacts the drive shaft of the step motor 122 for driving in the X direction.
The rotation of the motor 122 allows the frame 103 to move in the X direction on the printing paper.

In this embodiment, it is possible to secure the printing and secure the printing quality by the above-mentioned suction means even when the print-receiving paper is placed horizontally, and also for a slight inclination. In a thermal transfer system and an ink jetting head which does not require much printing pressure itself, for example, the above-mentioned mat 171 may not be required for adsorbing on paper, and an electrostatic printing paper adsorbing means may be used. In order to speed up printing, in a normal printer, the print head prints one character, and the width and height of the basic character are represented by 24 to 22 dots. Therefore, the print head has the same number of print elements as the number of dots and scans horizontally or vertically. Is also necessary in this embodiment. In addition, the movement in the Y direction can sufficiently function in one direction in order to reduce the cost. Further, a printer usually has a mechanism for changing the orientation of characters to be printed without changing the orientation of the print head when the print target paper is used in portrait or landscape orientation. There is a feature that this mechanism becomes unnecessary because the direction can be freely set in the vertical and horizontal directions.

[0014]

As described above, according to the present invention,
It prints on paper to be printed placed on a two-dimensional plane, varies the suction strength to change the printing pressure, and has a print head that runs on the two-dimensional plane to provide a long, highly accurate guide shaft. It is possible to provide a printer device that does not require a high-precision roller and has an extremely small width and depth than the printing target paper. Furthermore, the support point with the print target paper is located very close to the print head, and the space between the print target paper and the print target paper can be realized with an inexpensive and lightweight structure. This also enables printing on a larger sheet of paper while maintaining print quality. Further, since a mechanism for changing the direction of characters for printing is not required for both portrait and landscape paper, an inexpensive apparatus can be provided.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing the operation of one embodiment of the present invention.

FIG. 2 is a structural view of the self-propelled print head of FIG. 1 as viewed from below.

FIG. 3 is a diagram showing a conventional printing structure.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Self-propelled print head 101, 102 Roller rotating shaft 103 Frame 111 Print head 120, 130 Ball 121, 131 Roller 122 Step motor for X-direction drive 132 Step motor for Y-direction drive 141 Paper to be printed 142 Motor 143 Rod 151, 152 Electromagnet 161 Printed circuit board 162, 163 Control IC

Claims (5)

(57) [Claims] 1. A printing means for printing on a print-receiving sheet placed on a two-dimensional plane, a control means capable of changing a suction intensity for changing a printing pressure of the printing means, the printing means and the control means, A self-propelled print head, comprising: a moving unit that self-propelled in the two-dimensional plane. 2. The self-propelled print head according to claim 1, wherein printing is performed on the print target paper placed horizontally. 3. The apparatus according to claim 1, wherein said control means is a flat attracting means disposed on a back surface of said printing paper.
Self-propelled print head as described. 4. The self-propelled print head according to claim 1, wherein said printing means is a printing means which scans horizontally or vertically when printing one character. 5. The moving means is capable of moving in both directions with respect to a first direction of the two-dimensional plane and in one direction with respect to a direction perpendicular to the first direction of the two-dimensional plane. The self-propelled print head according to claim 1.