JPS6127747Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carriage guide mechanism for a serial printer. Serial printers are known in which a print head having various type carriers, such as a wire dot print head, a petal-shaped print head, a ball-type print head, etc. is attached to a carriage, and printing is performed by moving the carriage one character at a time in the printing direction.
The carriage of this serial printer is guided by a carriage bar that extends in the direction of the print line.
It is driven in the row direction by a timing belt or the like. FIG. 1 is a perspective view showing a carriage of a petal-shaped serial printer. In the figure, 1
Reference numerals 2 and 2 are two carriage bars that extend in the printing line direction of the serial printer, and 3 is a carriage frame that carries a printing hammer, a plunger that drives the printing hammer, a petal-shaped type ring, etc. It also moves left and right along the carriage bars 1 and 2. 4 is a bearing attached to the frame 3, through which the carriage bar 1 passes. 5 is also the frame 3
The carriage bar 2 passes through the bearing. Reference numeral 6 denotes a printing hammer, which is not shown in the figure, but hits the type on the type wheel disposed in front. 7 is a hammer lever that drives the printing hammer.

By the way, the conventional carriage as described above uses a structure in which two parallel carriage bars are inserted through two cylindrical bearings provided on the carriage, so the spacing between the bearings and the spacing between the carriage bars are accurate. If they do not match, the carriage bar cannot be inserted into the carriage bearing. Therefore, normally one carriage bar is loosely attached to the serial printer's housing, and after carrying the carriage, the interval between the carriage bars is set to 2.
Assembling was complicated because the carriage bar had to be finally fixed to match the spacing between the two bearings.

Furthermore, if a serial printer is used for a long period of time, the bearings of the carriage bar will wear out, causing play. As a result, the position of the carriage becomes unstable, resulting in uneven positions of printed characters, and the printing pressure becomes uneven, resulting in uneven print density, resulting in poor print quality. Ta.

This invention is a new invention that improves the above-mentioned drawbacks of the conventional methods.The purpose of this invention is to guide the carriage smoothly over a long period of time without causing play in the carriage even after long-term use, and to make assembly easier. It is an object of the present invention to provide a carriage guiding mechanism that eliminates the need for complicated work such as adjusting the parallelism of a carriage bar.

Next, one embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 2, reference numeral 8 denotes a base mounted inside the top plate 3a of the frame 3, and an L-shaped support plate 9 is mounted on the base 8. 10 is a leaf spring attached to the support plate 9. leaf spring 10
Two bearing shafts 11 and 12 are provided upright, and rollers 13 and 14 are rotatably supported on each bearing shaft, respectively. Reference numeral 15 denotes a tension spring stretched between the tips of the bearing shafts 11 and 12.

In the configuration as described above, the tension spring 15 is
As clearly shown in FIG. 3, the tensile force pulls the bearing shafts 11 and 12 in the direction of arrow A, causing the leaf spring 10 to bend slightly. Therefore, the rollers 13 and 14 tend to slide on the peripheral surface 1a of the carriage bar 1 and move toward each other. Therefore, the bar 1 held between the rollers 13 and 14 is held without any play in the vertical direction. or,
Both rollers 13 and 14 are arranged so as to resist the elastic force of the plate spring 10 and come into contact with the circumferential surface of the bar 1 on the opposite side to the plate spring 10.
3 and 14 are always pulled in the direction of FIG.

As is clear from the above, the carriage frame 3
As long as the carriage bar 2 on one side is accurately positioned and held with the same configuration as before, the carriage bar 1 on the other side can be positioned even if the hole in the carriage frame 3 is provided with some dimensional margin. As described above, the bar 1 is held by both rollers 13 and 14 without any play in either the vertical or horizontal directions, and therefore, there is no play between the carriage and the bar 1 at all.

In the above embodiment, the carriage is guided by a bearing on the front carriage bar in the printing direction, and a bearing mechanism is placed on the rear carriage bar, but depending on the mechanism of the serial printer, this may be reversed. good.

As described in detail above, according to the present invention, the carriage is supported by the above-mentioned bearing mechanism on one of the carriage bars, and the carriage is supported on the other carriage bar by the bearing, so that two carriages can be mounted. Hold it precisely in the carriage bar of the
In addition, it is easy to insert and assemble. Therefore, the carriage is precisely positioned and held by the bearing for only one carriage bar, and is held for the other carriage bar by two rollers without play, so that the two The distance between the carriage bars and the parallelism management can be simplified, the assembly work efficiency is significantly improved, and some wear due to use over time can be tolerated.

In the above-described embodiment, only one holding mechanism was provided to prevent wobbling between the bar and the carriage, but this may be added if necessary.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional carriage guide mechanism seen from the rear, Fig. 2 is a perspective view of the carriage guide mechanism according to the present invention seen from the rear, and Fig. 3 is a side sectional view of the same essential parts. . In the figure, 1 and 2 are carriage bars, 1a is a peripheral surface, 3 is a frame body, 3a is a top plate, 4 and 5 are bearings,
6 is a printing hammer, 7 is a hammer lever, 8 is a base, 9 is a support plate, 10 is a leaf spring, 11 and 12 are bearing shafts, 13 and 14 are rollers, and 15 is a tension spring.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a carriage guide mechanism in which a carriage holding a printing head, etc. is pivoted on two carriage bars and moved in the row direction, a plate with one end fixed to the frame of the carriage. A spring, two bearing shafts erected parallel to each other on the leaf spring, a tension spring tensioned at the tips of these two bearing shafts, and a roller rotatably supported on each of the bearing shafts. This bearing mechanism supports the carriage on one of the carriage bars while pressing the rollers against the circumferential surface of the carriage bar. A guide mechanism for a carriage in a serial printer, characterized in that the carriage is pivotally supported through the carriage. (2) In a carriage guide mechanism in which a carriage holding a printing head, etc. is pivoted on two front and rear carriage bars in the printing direction and moved in the row direction, a bearing mechanism for the carriage is provided for the rear carriage bar. A carriage guide mechanism in a serial printer according to claim 1, characterized in that the carriage guide mechanism is configured as follows.