JP2652982B2 - Timing belt for power transmission of serial printer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timing belt for transmitting a spacing power of a serial printer having a carriage on which a print head is mounted and performs printing while reciprocating along a platen. .

[Conventional technology]

A spacing power transmission device of a serial printer with a carriage that prints while performing reciprocating motion along a platen with a print head mounted is a stepping motor as a power source for reciprocating motion and fixed on the axis of this stepping motor And a driven pulley provided outside the range of movement of the carriage corresponding to the pulley. A timing belt is stretched between the pulley and the driven pulley. Is fixed to the carriage.

The conventional timing belt used for the spacing power transmission device of such a serial printer is provided with teeth having a trapezoidal cross section at regular intervals in a direction perpendicular to the length direction of the timing belt. The pulley meshing with the pulley has a structure having flanges at both ends.

[Problems to be solved by the invention]

In the conventional timing belt as described above, backlash occurs at the meshing portion between the pulley and the timing belt,
For this reason, there is a disadvantage that the positioning accuracy of the carriage is deteriorated and the print quality is reduced. Further, there is a disadvantage that vibration is generated at a meshing portion between the pulley and the timing belt, and noise is generated by the generated vibration. Furthermore, since the timing belt is likely to move in the width direction and come off the pulley, it is necessary to provide flanges on both side surfaces of the pulley to prevent the timing belt from coming off the pulley. There is also the disadvantage of becoming.

[Means for solving the problem]

A timing belt for transmitting a spacing power of a serial printer according to the present invention is provided with a trapezoidal section having a trapezoidal cross section at the center in the width direction continuously over the entire length. The tooth profile is a helical tooth having a predetermined angle of inclination with respect to the length direction.

Further, the timing belt for transmitting spacing power of the serial printer of the present invention has a trapezoidal section having a trapezoidal cross-section at the center in the width direction and is provided continuously over the entire length, and the tooth form is formed by the chevron part to the right and left. Divide into two,
The phases of the left and right tooth profiles are shifted from each other by half of their pitch.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

1 is a perspective view showing a first embodiment of the present invention, FIG. 2 is a perspective view showing a tooth shape of a drive pulley meshing with the embodiment of FIG. 1, and FIG. 3 is an embodiment of FIG. FIG. 2 is a perspective view illustrating an example of a spacing power transmission device of a serial printer used.

As shown in FIG. 3, the spacing power transmission device of the serial printer is provided with a stepping motor 7 for driving a carriage 3 that carries a print head 2 and performs printing while reciprocating along a platen 1. Have been. A drive pulley 8 is fixed to the shaft of the stepping motor 7, and a timing belt 6 is stretched between a tension pulley 9 provided opposite to the drive pulley 8 and the drive pulley 8. Part of the timing belt 6 is fixed to the carriage 3. Accordingly, the drive pulley 8 is driven by the rotation of the stepping motor 7, and the timing belt 6 is driven.
The carriage 3 is driven via. The carriage 3
It is guided by the guide shafts 4 and 5 and moves left and right.

As shown in FIG. 1, the timing belt 6 has a tooth shape 6a having a trapezoidal cross section and a mountain shape in plan view. The tooth profile 8a of the drive pulley 8 also has a mountain-shaped developed plane shape that matches the tooth profile 6a of the timing belt 6, as shown in FIG. The tension pulley 9 is exactly the same.

With the configuration described above, the backlash is removed and the timing belt 6 is prevented from coming off the pulley.

FIGS. 4A and 4B are a perspective view and a sectional view taken along line AA of a second embodiment of the present invention, and FIGS. 5A and 5B are meshed with the embodiment of FIG. It is the perspective view and BB sectional drawing which show the tooth profile of the drive pulley which fits.

As shown in FIG. 4, the timing belt 16 is provided with a chevron section 16b having a trapezoidal cross section at the center in the width direction continuously over the entire length. Is divided into two. Corresponding to this, the drive pulley 18 is provided with a groove 18a at the center thereof for fitting the chevron 16b of the timing belt 16, as shown in FIG. The same is true for the tension pulley.

By configuring as described above, the timing belt
The 16 chevron portions 16b fit into the grooves of the drive pulley 18 and the tension pulley and prevent the timing belt 16 from coming off the pulley.

6 (a) and 6 (b) are perspective views showing a third embodiment of the present invention and an enlarged perspective view of a tooth profile viewed from the direction of arrow C. FIG. 7 is a drive meshing with the embodiment of FIG. It is a perspective view which shows the tooth profile of a pulley.

In the present embodiment, at the center in the width direction of the timing belt 26, a chevron 26b having a cross section protruding in a trapezoidal shape is provided continuously over the entire length.
It is divided. The tooth profile 26a is a helical member having an inclination angle α with respect to the length direction. Correspondingly, the drive pulley 28 is provided with a groove 28a at the center thereof for fitting the chevron 26b of the timing belt 26, as shown in FIG. The same is true for the tension pulley.

By configuring as described above, the timing belt
The angled portion 26b of 26 fits into the groove of the drive pulley 28 and the tension pulley to prevent the timing belt 26 from coming off the pulley and to remove the backlash.

FIG. 8 is a perspective view showing a fourth embodiment of the present invention, and FIG. 9 is a perspective view showing the tooth profile of a drive pulley engaged with the embodiment of FIG.

The timing belt 36 of the embodiment of FIG. 8 has a trapezoidal section 36b having a trapezoidal cross-section at the center in the width direction and is continuously provided over the entire length. It was done. The phase of the left and right tooth profiles 36a is
They are shifted from each other by half (1 / 2P) of their pitch P. Correspondingly, the drive pulley 38 has, as shown in FIG.
There is provided a groove 38a into which 36b is inserted, and the right and left tooth shapes 38
The phase of b is also shifted by 1/2 pitch. The same is true for the tension pulley.

By configuring as described above, the timing belt
The chevron 36b of the 36 fits into the groove of the drive pulley 38 and the tension pulley, and prevents the timing belt 36 from coming off the pulley.

〔The invention's effect〕

As described above, the timing belt for transmitting spacing power of the serial printer of the present invention can improve the meshing state between the pulley and the timing belt, so that the vibration at the meshing portion between the pulley and the timing belt can be improved. Thus, there is an effect that generation of noise can be prevented and generation of noise can be reduced. In addition, there is an effect that the timing belt can be prevented from moving in the width direction to prevent the timing belt from coming off the pulley.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a first embodiment of the present invention, FIG. 2 is a perspective view showing a tooth shape of a drive pulley engaged with the embodiment of FIG. 1, and FIG. FIG. 1 is a perspective view showing an example of a spacing power transmission device of a serial printer using the embodiment of FIG. 1;
4 (a) and 4 (b) are perspective views and a sectional view taken along line AA of a second embodiment of the present invention, and FIGS. 5 (a) and 5 (b) mesh with the embodiment of FIG. FIGS. 6 (a) and 6 (b) are perspective views showing the tooth profile of the drive pulley and a sectional view taken along the line BB, and FIGS. 6 (a) and 6 (b) are perspective views showing the third embodiment of the present invention and an enlarged view of the tooth profile seen from the direction of arrow C. FIG. 7 is a perspective view showing the tooth profile of the drive pulley meshing with the embodiment of FIG. 6, FIG. 8 is a perspective view showing a fourth embodiment of the present invention, and FIG. 9 is a view of FIG. It is a perspective view which shows the tooth profile of the drive pulley which meshes with an Example. 1 ... Platen, 2 ... Print head, 3 ... Carriage, 4.5 ... Guide shaft ... 6, 16, 26, 36
…… Timing belt, 6a ・ 8a ・ 16a ・ 26a ・ 36a ・ 38b…
… Tooth profile, 16b / 26b / 36b …… angle section, 7 …… stepping motor, 8/18/28/38 …… drive pulley, 18a / 2
8a / 38a: Groove, 9: Tension pulley.

Claims (2)

(57) [Claims] An angled section having a trapezoidal cross section is provided continuously at the center in the width direction over the entire length, and the angled section divides the tooth profile into two parts on the left and right sides. A timing belt for transmitting a spacing power of a serial printer, wherein the timing belt has a slant angle. 2. A toothed section having a trapezoidal section in the center in the width direction is continuously provided over the entire length, and the toothed part is divided into two parts by the angled part. A timing belt for transmitting the spacing power of a serial printer, which is shifted by half of the above.