JP2814859B2 - Recording mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording mechanism used in facsimile machines, copiers and the like.

[0002]

2. Description of the Related Art A conventional recording mechanism will be described with reference to the drawings.

FIG. 6 is a sectional view of a conventional recording mechanism. The printing roller 2 is pressed against the printing position 11 of the thermal head 1. The printing roller 2 is connected to a motor 5 by a driving system 4 such as a gear train. When the motor 5 rotates, the print roller 2 also rotates, and conveys the recording paper 3 in the sub-scanning direction. At this time, if the rotation speed of the motor 5 is synchronized with the printing speed of the photoelectric conversion unit of the thermal head 1, an image can be printed on recording paper.

[0004]

As described above, the conventional recording mechanism has a problem that a large space is required for conveying the recording paper by rotating the roller using a drive system.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a novel recording mechanism capable of solving the above-mentioned problems inherent in the prior art. It is in.

[0006]

In order to achieve the above object, a recording mechanism according to a first aspect of the present invention comprises a plurality of recording electrodes arranged in a main scanning direction, and a thermosensitive recording paper closely contacted at a printing position. A thermal head that prints on the adhered recording paper, a vibrator having a convex central portion and a length substantially equal to the print width of the thermal head, and a central convex portion of the vibrator interposed therebetween. A piezoelectric ceramic adhered to a target position; and a high frequency power supply for applying a high frequency voltage having a phase shift of 90 degrees to the piezoelectric ceramic, and a vertex of a central convex portion of the vibrator at a printing position of the thermal head. Is located.

A recording mechanism according to a second aspect of the present invention includes a thermal head for arranging a plurality of recording electrodes in a main scanning direction, closely contacting a thermosensitive recording paper at a printing position, and printing on the closely adhered recording paper. A vibrator whose portion is convex and whose length is shorter than the printing width of the thermal head, a piezoelectric ceramic bonded to a target position across a central convex portion of the vibrator, and a cross-sectional shape A recording paper pressing block having substantially the same length as the vibrator but having the same length as the portion without the vibrator in the print width, and a high-frequency power supply for applying a high-frequency voltage having a phase shift of 90 degrees to the piezoelectric ceramic. The vibrator and the pressing block are arranged at the printing position of the thermal head with the apex of the central convex portion of the pressing block, and the vibrator and the pressing block are arranged side by side in the main scanning direction without any gap.

Further, a recording mechanism according to a third aspect of the present invention is a thermal head in which a plurality of recording electrodes are arranged in the main scanning direction, a thermosensitive recording paper is brought into close contact at a printing position, and printing is performed on the closely adhered recording paper. A vibrator whose central portion is convex and whose length is shorter than the printing width of the thermal head, a piezoelectric ceramic bonded to a target position across the central convex portion of the vibrator, A vibrator block including the vibrator and the piezoelectric ceramic and having a cross-sectional shape substantially the same as the vibrator and having a length equal to or greater than a printing width, and simultaneously formed integrally with an injection-molded plastic; A high-frequency power supply for applying a high-frequency voltage out of phase, wherein a vertex of a central convex portion of the vibrator block is located at a printing position of the thermal head.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a preferred embodiment of the present invention.

FIG. 1 is a sectional view showing an embodiment of the first invention.

Referring to FIG. 1, a thermal head 1 records an image on a recording sheet 3 closely attached to a printing position 11. The vibrator 6 has a central portion 61 protruding in a convex shape, and the length in the main scanning direction is substantially equal to or longer than the printing width of the thermal head 1. The piezoelectric ceramics 71 and 72 are bonded to the vibrator at target positions with the vibrator center convex portion 61 interposed therebetween.
The piezoelectric ceramics 71 and 72 are applied with a high-frequency voltage having a phase difference of 90 degrees as shown in FIG.

The vibrator 6 can print on the recording paper 3 sandwiched between the vibrator 6 and the thermal head 1 if the vertex of the central convex portion 61 is positioned so as to coincide with the printing position 11 of the thermal head 1. it can.

At this time, when sine voltages having phases shifted by 90 degrees from each other are applied to the piezoelectric ceramics 71 and 72, the apex of the central portion 61 of the vibrator performs an elliptic motion. This movement will be described with reference to the drawings.

When a voltage 90 degrees out of phase is applied to the piezoelectric ceramics 71 and 72 as shown in FIG.
As shown in FIG. 5, it receives forces of f11 to f14 and f21 to f24. For this reason, at time t1, it is compressed from both sides and the vertex of the vibrator center part 61 is displaced in the A direction. Similarly, at time t2, it is displaced in the B direction, at time t3, in the C direction, and at time t4, it is displaced in the D direction to perform an elliptic motion. A similar motion can be obtained with a sine wave for the voltage waveform, and a smoother elliptical motion occurs with the sine wave. Due to the elliptical motion, the recording paper 3 in contact with the vertex of the vibrator central portion 61 obtains a driving force via frictional force and is conveyed in the direction E in FIG.

The transport speed of the recording paper 3 is set at the center 61 of the vibrator.
The magnitude of the elliptical motion depends on the voltage. Therefore, correct printing can be performed by adjusting the voltage so that the transport speed of the recording paper 3 is synchronized with the printing speed of the thermal head 1.

The shape of the center portion 61 of the vibrator may be any shape such as a trapezoid, an arc, an ellipse, and a sine wave as long as elliptical vibration is easily generated. Also, the vibrator center portion 61
Can be realized with a height of about 3 to 5 mm.

FIGS. 2A to 2C are views showing an embodiment of the second invention.

FIG. 2A is a sectional view showing one embodiment of the vibrator portion of the second invention.

Referring to FIG. 2A, the thermal head 1 records an image on a recording sheet 3 closely attached to a printing position 11. The vibrator 6 has a central portion 61 protruding in a convex shape, and the piezoelectric ceramics 71 and 72 are bonded to the vibrator 6 at target positions with the vibrator central convex portion 61 interposed therebetween. The piezoelectric ceramics 71 and 72 are mutually 90
High-frequency voltages that are out of phase can be applied.

FIG. 1B is a sectional view of a pressing block portion according to the second invention. The cross-sectional shape of the pressing block 9 is substantially the same as that of the vibrator 6, and the pressing block 9 is pressed against the thermal head 1 by springs 91 and 92 having weak forces.

FIG. 1C is a plan view of the second invention.
The length of the vibrator 6 in the main scanning direction is the thermal head 1.
, And a plurality of print widths are arranged in the main scanning direction. The pressing blocks 9 are arranged in a portion other than the vibrator 6 without any gap.

If the vibrator 6 and the pressing block 9 are placed so that the apex of the central convex portion coincides with the printing position 11 of the thermal head 1, an image is formed on the recording paper 3 sandwiched between the vibrator 6 and the thermal head 1. Can be recorded.

At this time, when a sine voltage having a phase shift of 90 degrees is applied to the piezoelectric ceramics 71 and 72, the apex of the vibrator central portion 61 performs an elliptic motion. This movement will be described with reference to the drawings.

As shown in FIG. 4, when a voltage having a phase difference of 90 degrees is applied to the piezoelectric ceramics 71 and 72, the vibrator 6
Are f11 to f14 and f21 to f2 as shown in FIG.
Receive 4 forces. For this reason, at time t1, it is compressed from both sides and the vertex of the vibrator center part 61 is displaced in the A direction. Similarly, it is displaced in the B direction at time t2, in the C direction at time t3, and in the D direction at time t4, and performs an elliptic motion. A similar motion can be obtained with a sine wave for the voltage waveform, and a smoother elliptical motion occurs with the sine wave. Due to this elliptical motion, the recording paper 3 in contact with the vertex of the transducer central portion 61
Obtains a driving force via a frictional force, and is conveyed in a direction E in FIG.

The conveyance speed of the recording paper 3 is set at the center 61 of the vibrator.
The magnitude of the elliptical motion depends on the voltage. Therefore, correct printing can be performed by adjusting the voltage so that the transport speed of the recording paper 3 is synchronized with the printing speed of the thermal head 1.

The shape of the central portion 61 of the vibrator may be any shape such as a trapezoid, an arc, an ellipse, and a sine wave as long as the elliptical vibration is easily generated, and the number may be one. Further, the height of the vibrator center portion 61 can be realized at about 3 to 5 mm.

FIGS. 3A to 3C are views showing an embodiment of the third invention.

FIG. 3A is a sectional view showing an embodiment of the vibrator portion according to the third invention.

Referring to FIG. 3A, the thermal head 1 prints an image on the recording paper 3 closely contacted with the print position 11. The vibrator 6 has a central portion 61 protruding in a convex shape, and the piezoelectric ceramics 71 and 72 are bonded to the vibrator at target positions with the vibrator central convex portion 61 interposed therebetween. Further, the piezoelectric ceramics 71 and 72 are applied with high frequency voltages having phases shifted by 90 degrees from each other by the high frequency power supply 8.

FIG. 3B is a sectional view of an injection-molded plastic part of the vibrator block 10 according to the third invention. The cross-sectional shape of the vibrator block 10 made of injection-molded plastic is substantially the same as that of the vibrator 6.

FIG. 3C is a perspective view of the vibrator block 10 according to the third invention. The length of the vibrator 6 in the main scanning direction is shorter than the printing width of the thermal head 1, and a plurality of the vibrators 6 are arranged in the main scanning direction. Parts other than the vibrator 6 are formed of injection-molded plastic (vibrator block) 10, that is, the vibrator 6 is embedded in the vibrator block 10. Vibrator 6, piezoelectric ceramics 71, 72,
The injection molded plastic 10 is simultaneously and integrally molded.

When the vibrator block 10 is placed so that the apex of the central convex portion coincides with the printing position 11 of the thermal head 1, an image is printed on the recording paper 3 sandwiched between the vibrator block 10 and the thermal head 1. can do. At this time, when a sine voltage having a phase shift of 90 degrees is applied to the piezoelectric ceramics 71 and 72, the apex of the vibrator center portion 61 performs an elliptic motion. This movement will be described with reference to the drawings.

When a voltage having a phase shift of 90 degrees is applied to the piezoelectric ceramics 71 and 72 as shown in FIG.
As shown in FIG. 5, it receives forces of f11 to f14 and f21 to f24. For this reason, at time t1, it is compressed from both sides and the vertex of the vibrator center part 61 is displaced in the A direction. Similarly, at time t2, it is displaced in the B direction, at time t3, in the C direction, and at time t4, it is displaced in the D direction to perform an elliptic motion. A similar motion can be obtained with a sine wave for the voltage waveform, and a smoother elliptical motion occurs with the sine wave. Due to this elliptical motion, the recording paper 3 in contact with the vertex of the transducer central portion 61 is
The driving force is obtained via the frictional force, and the sheet is conveyed in the direction E in FIG.

The transport speed of the recording paper 3 is set at the center 61 of the vibrator.
The magnitude of the elliptical motion depends on the voltage. Therefore, correct printing can be performed by adjusting the voltage so that the transport speed of the recording paper 3 is synchronized with the printing speed of the thermal head 1.

The shape of the vibrator central portion 61 may be any shape such as a trapezoidal shape, an arc type, an elliptical shape, and a sine wave type as long as elliptical vibration is easily generated. One is acceptable. Also, the height of the vibrator center part 61 is 3
５5 mm.

[0036]

As described above, according to the first aspect of the invention, by combining a thermal head and a vibrator having a convex central portion to which a piezoelectric ceramic is bonded, a thin and thin paper can be conveyed and recorded. A recording mechanism that can perform the recording.

According to the second aspect of the present invention, the combination of the vibrator and the pressing block having a convex central portion in which the thermal head and the piezoelectric ceramic are bonded to each other makes it possible to convey and record paper in a thin shape. And a recording mechanism that requires only a small piezoelectric ceramic can be provided.

According to the third aspect of the present invention, the thermal head is combined with a vibrator block integrally formed with a vibrator having a convex central portion to which a piezoelectric ceramic is adhered, thereby achieving a thin, paper transport and recording. And a recording mechanism that requires only a small piezoelectric ceramic can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the first invention.

2A is a cross-sectional view showing one embodiment of a vibrator portion according to the second invention, FIG. 2B is a cross-sectional view showing a pressing block portion,
(C) is a plan view.

3A is a cross-sectional view showing one embodiment of a vibrator part according to the third invention, FIG. 3B is a cross-sectional view of an injection-molded plastic part of a vibrator block, and FIG. 3C is a perspective view.

FIG. 4 is a diagram showing an example of a high-frequency voltage waveform.

FIG. 5 is a diagram showing a motion of a vibrator.

FIG. 6 is a sectional view of a conventional recording mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Thermal head 2 ... Roller 3 ... Thermal recording paper 4 ... Deceleration mechanism 5 ... Motor 6 ... Vibrator 8 ... High frequency power supply 9 ... Press block 10 ... Vibrator block 11 ... Printing position 61 ... Vibrator center part 71, 72 ... Piezoelectric ceramic 91, 92 ... spring

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) B41J 2/32-2/325 B41J 11/00-11/02 B41J 13/00 B65H 5/00

Claims (3)

(57) [Claims] 1. A thermal head, in which a plurality of recording electrodes are arranged in a main scanning direction, a thermosensitive recording paper is brought into close contact at a printing position, and a thermal head for printing on the closely adhered recording paper is provided. A vibrator having a length substantially the same as the printing width of the thermal head, a piezoelectric ceramic bonded to a target position across a central convex portion of the vibrator, and 9
And a high-frequency power supply for applying a high-frequency voltage having a phase shift of 0 degrees, wherein a vertex of a central convex portion of the vibrator is located at a printing position of the thermal head. 2. A thermal head in which a plurality of recording electrodes are arranged in a main scanning direction, a thermosensitive recording paper is brought into close contact at a printing position, and a thermal head for printing on the adhered recording paper is provided. A vibrator having a length shorter than the printing width of the thermal head, a piezoelectric ceramic bonded to a target position across a central convex portion of the vibrator, and a cross-sectional shape substantially equal to the vibrator in length; Has a recording paper pressing block of the same length as the portion without the vibrator in the printing width, and a high-frequency power supply for applying a high-frequency voltage having a phase shift of 90 degrees to the piezoelectric ceramic, and a printing position of the thermal head. A vertex of a central protruding portion of the vibrator and the pressing block, and the vibrator and the pressing block are arranged side by side in the main scanning direction without a gap. 3. A thermal head in which a plurality of recording electrodes are arranged in the main scanning direction, a thermosensitive recording paper is brought into close contact at a printing position, and a thermal head for printing on the adhered recording paper is provided. A vibrator having a length shorter than a printing width of the thermal head, a piezoelectric ceramic bonded to a target position across a central convex portion of the vibrator, and a cross-sectional shape including the vibrator and the piezoelectric ceramic A vibrator block simultaneously molded integrally with out-molded plastic so that the length is substantially the same as the vibrator and the length is equal to or greater than the printing width; And a vertex of a central convex portion of the vibrator block is positioned at a printing position of the thermal head.