JPS63172675A - Carriage for serial printer - Google Patents

Abstract

PURPOSE:To minimize weight and size, reduce the effects of variations in shape and contrive favorable dimensional stability, by inserting resin pipes into bearing parts, and connecting the resultant assembly to a main body of a carriage in a body. CONSTITUTION:Projected parts 38 of a pair of pipes 37 are fixed in a metallic mold for a carriage, then a resin is poured into the mold through recessed parts between the projected parts 38 to mold a main body 35 of the carriage, a printing head mounting part 33 and guides 39. A guide rail 6 is passed through the pipes 37, and the carriage is reciprocated along the guide rail 6 at the time of recording. Bearing parts can be provided with a required strength. The amount of a material having excellent abrasion resistance and a size matching the strength can be minimized. Therefore, it is possible to prevent significant changes in shape or size of the carriage from being generated, even upon a temperature rise due to frictional heat between a bearing and a shaft, a rise in the temperature of a head, the ambient temperature or humidity or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a carriage for a serial printer, which is equipped with a print head and moves back and forth along a guide rail.

[Conventional technology]

A serial printer records on plain paper, for example, line by line, via a thermal transfer ribbon or an ink ribbon, while moving a thermal head, wire dot head, or the like by a carriage in a direction perpendicular to the conveyance direction of the recording paper.

6 to 10 show the configuration of a conventional serial printer. Fig. 6 is a perspective view showing the external appearance, Fig. 7 is a cross-sectional view taken along arrows -■ in Fig. 6, Fig. 8 is a plan view of the printer shown in Fig. 7, and Fig. 9 shows the configuration of a conventional carriage. The perspective view and FIG. 10 are perspective views showing other structures of the carriage.

In FIG. 6, the casing of the printer consists of a lower case 1, an upper case 2, and a front case 3, and a printing mechanism is incorporated inside. On the front side of the upper case 2, a front cover 3 supporting a transparent plate 4 for viewing the inside of the printer is rotatably supported, and behind it is a rotatable multi-purpose cover for cents of printing paper, etc. A cover 30 is provided. An operating lever 11 is protruded from the upper part of the upper case 2 for separating the pinch roller 10 shown in FIG. 7 from the platen 7 when adjusting the width of the recording paper. Also, on the side of the upper case 2, a platen knob 1 for manually rotating the platen 7 is provided.
6 is provided.

In FIGS. 7 and 8, the printing head 5 is configured as a wire dot head and is mounted on a carriage 8 slidably provided on two guide rails 6. As shown in FIGS. The print head 5 prints the paper on the print paper on the platen 7 while being moved in the left-right direction in FIG.

Recording paper is wound around the outer peripheral surface of the platen 7 via a paper pressing roller 9 and a pinch roller 1O, which are rotatably pressed against the outer peripheral surface of the platen 7. The platen 7 is driven by a pulse motor 19 when feeding paper.
Driven by gear 20.21° heald 25 and pulley 2
6 in the direction of printing A shown in FIG.

As recording paper, fanfold paper 14, roll i
Either l'1E17 or cut paper 18 can be used. Fanfold paper 14 and roll paper 17
In this case, the tractor 12, which has pins 12a protruding from the outer peripheral surface at predetermined intervals, rotates in the direction of arrow B to transport the object. A paper presser 15 is provided to improve the adhesion between the recording paper 14 or 17 and the tractor 12. One or both of the pair of tractors 12 can be moved on a rotary shirt 13 in accordance with the spacing between feed holes formed at both ends of the recording paper (disposed continuously at regular intervals in the paper feeding direction). Further, an insertion opening 14 is formed on the transparent plate 4 side of the cover 30 for inserting the cut paper 18, and the tip of the cut paper 18 is configured to be able to be caught in the platen 7. Note that 23 is a printed circuit board that constitutes a control circuit that controls the entire printer.

In the above configuration, for example, when the recording paper is the fanfold paper 14, the cover 30 is opened, the leading edge of the fanfold paper 14 is caught between the platen 7 and the pinch roller 10, and both ends near the leading edge are held by the tractor 12. After aligning the hole position with , close the paper holder 15. In this state, the platen knob 16 is rotated to bring the fanfold paper 14 to the recording position. Thereafter, each time the carriage 8 reciprocates the print head 5, the pulse motor 19 rotates, the platen 7 rotates by a certain amount in the direction A, and the fanfold paper is conveyed by, for example, the line spacing.

By the way, the carry nozzle 8 is generally a die-cast molded product shown in FIG. 9 or a molded product shown in FIG. 10.

In FIG. 9, a carriage base 40 is formed into a predetermined shape using a material such as aluminum, and a bearing 41 that is fitted onto the guide rail 6 is provided on the negative side. The bearing 4° 1 is formed of a copper-based or iron-based sintered body containing lubricating oil, and is press-fitted and integrated into the carriage base 40. A female thread 42 for fixing the print head 5 is machined along the bearing 41.

In addition, in FIG. 1O, a U-shaped guide holding part 44 is integrally formed with the bearing part 43 that is externally fitted on the guide rail 6, and a U-shaped guide holding part 44 is attached to the top of the guide holding part 44 to restrict the whirling of the carriage. A guide 45 is formed. Furthermore, a female screw 46 is provided at the upper part of the bearing part 43 for fixing the print head 5 to the print. The material used for this mold is often a glass fiber-containing resin or a carbon fiber-containing resin that has excellent abrasion resistance, oil resistance, and heat resistance.

[Problem that the invention seeks to solve]

However, when conventional serial printer carriages are molded, not only is it necessary to use wear-resistant materials, but the higher the strength, the heavier the carriage becomes, which increases costs. As a result, the dimensions of each part become larger and more easily affected by temperature, resulting in reduced dimensional stability and difficulty in obtaining stable printing quality.

Furthermore, when die-casting is used, the number of parts and the number of work steps increase, and since the material is metal, the weight increases, making it unsuitable for high-speed printing and increasing costs. This problem also applies to press-formed carriages.

(Objective) The object of the present invention is to solve the problems of the prior art, to minimize the weight and size, to minimize the effects of changes in shape due to temperature, etc., and to achieve dimensional stability. An object of the present invention is to provide a carriage for a thermal printer.

[Means for solving problems]

The present invention prevents weight increase and enables high-speed printing by inserting a joint-pressure pipe or a resin pipe with a higher melting point and higher rigidity than the molded part into the bearing part and integrating it into the carriage body. , thereby achieving the above objective.

[Effect]

According to the above means, the carriage body is lightweight and wear-resistant.
By using a resin with excellent heat resistance and oil resistance, and using a material with excellent strength for the shaft, the dimensions commensurate with the strength,
In order to minimize the amount of material and prevent the shape from changing even if the frictional heat of the shaft or the temperature of the head rises, it is possible to press fit the bearing into the bearing part or use means such as gluing or heat welding. It is possible to configure a carriage for a serial printer without any need for a serial printer.

〔Example〕

Hereinafter, the present invention will be specifically explained with reference to FIGS. 1 to 5.

FIG. 1 is a perspective view showing an embodiment of a carriage according to the present invention. Figure 2 is a front view of the carriage in Figure 1;
The drawings are a sectional view taken along the line A-A of the carriage shown in FIG. 2, FIG. 4 is a left side view of the carriage shown in FIG. 2, and FIG. 5 is a perspective view of a pipe inserted into the shaft.

In FIG. 1, a shaft portion 36 is formed at the leg end of a U-shaped carriage body 35. As shown in FIG.

A pipe 37 is inserted into this shaft portion 36. As shown in FIG. 5, the pipe 37 is formed with a plurality of convex portions 38 for holding the pipe 37 in a mold during molding of the carriage body 35.

Note that 33 is a print head mounting section, and 39 is a guide for regulating the whirling of the carriage.

The carriage body 35 is made by molding a resin material with excellent wear resistance, heat resistance, and oil resistance. As this resin material, Teflon, polyimide, polybutylene terephthalate, etc. can be used. In addition,
In the case of polybutylene terephthalate +-+h resin, glass fiber may be mixed in to increase the strength.

On the other hand, the pipe 37 is made of metal such as iron, aluminum, copper, alloy, etc.
Alternatively, it is made using a resin having a higher melting point than the resin material of the carriage body 35.

In the above configuration, when manufacturing the carriage, first, the protrusions 38 of the pair of pipes 37 are fixed to the mold of the carriage, and then M fat is injected into the mold from the recesses between the protrusions 38 to form the carriage body. 35. Molding the print head mounting portion 33 and guide 39.

In the carriage thus manufactured, as shown in FIG. 2, a guide rail 6 is inserted between the pipes 37, and the carriage reciprocates along the guide rail 6 during recording.

With the above configuration, the required strength can be obtained in the bearing portion. It is possible to minimize the use of materials with dimensions commensurate with this strength and excellent wear resistance, and to prevent temperature rises due to frictional heat between the bearing and shaft, head temperature rises, and changes in ambient temperature and temperature. However, there is no problem with the shape and dimensions of the carriage.

Therefore, high strength and rigidity can be obtained without using methods such as press-fitting the bearing into the bearing portion, adhesion, heat welding, etc. as in the conventional method.

In the above example, reinforcing material using a pipe was inserted only in the shaft part, but metal members (pipes made of iron, aluminum, copper, alloy, etc., round bars, etc.) were inserted in the parts where rigidity is required. , square bar, steel strip, steel, etc.) or a resin having a higher melting point than the material of the resin used in the mold can be used.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, a pipe serving as a bearing is inserted into the shaft of the resin-molded carriage body, so the size of the carriage can be minimized while providing the necessary strength to the shaft. Provided is a serial printer carriage which can minimize dimensional changes due to frictional heat, environmental temperature, etc., thereby achieving dimensional stability and cost reduction.

[Brief explanation of the drawing]

1 is a perspective view showing an embodiment of the carriage according to the present invention, FIG. 2 is a front view of the carriage shown in FIG. 1, FIG. 3 is a cross-sectional view of the carriage taken along line A-A in FIG. 2, and FIG. is a left side view of the carriage shown in Fig. 2, Fig. 5 is a perspective view of the pipe inserted into the shaft, Fig. 6 is a perspective view showing the external appearance of a conventional serial printer, and Fig. 7 is the printer shown in Fig. 6. Fig. 8 is a plan view of the printer shown in Fig. 7, Fig. 9 is a perspective view showing the structure of a conventional carriage, and Fig. 10 is a perspective view showing the structure of another conventional carriage. It is a diagram. 5-・-・--1 print head, 6-----・-・
・・Guide rail, 35−・・−−−−−−−−Carriage body, 36−−・−・−・Shaft portion, 37−−−−−・
・・−・−Pipe, 38−・−・・−・−・Protrusion, 39
−・・・−・・−Guide. Agent Patent Attorney Yasushi Oto Grain cylinder Figure 1 Figure 2 Figure 3

Claims (3)

[Claims] (1) In a serial printer that prints while the print head is moved by a carriage in a direction perpendicular to the conveyance direction of recording paper, a pipe disposed in a bearing part whose axis is a guide rail or the like fixed to the printer; A serial printer carriage consisting of a resin-molded carriage body that is integrally formed with the pipe. (2) The serial printer carriage according to claim 1, wherein the pipe is made of a resin having a higher melting point and higher rigidity than the material of the carriage body. (3) The carriage for a serial printer according to claim 1, wherein the pipe is made of a metal material.