JPS63172676A - 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 integrating bearings into bearing parts of a main body of a carriage formed by press working, by an outsert forming. CONSTITUTION:A flat plate form main body 50 of a carriage is blanked in the state of being not provided with members shown at shaded parts, and a bead 53 is formed by press working. Next, bearings 54 are fixed in bearing parts 51 by outsert forming, and supporters 55 and 56 are fixed respectively in a flat part and a guide part 52 by insertion. Then, the bearing parts 51 and the guide part 52 are bent, and ribs 57, 58 and 59 are formed. A guide rail 6 is passed through the bearings 54, and a vibration-preventive guide shaft 60 or the like is disposed between the supports 55 and 66. Thus, variations in shape due to temperature variations or the like are minimized, dimensional stability is enhanced, a lighter weight can be contrived through a reduction in the amount of material for the main body, and printing speed can be enhanced.

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.

[Prior Art] Serial printers print plain paper on a line-by-line basis via a thermal transfer ribbon or ink ribbon while moving a thermal head or a wire dot head using a carriage in a direction perpendicular to the conveying direction of recording paper. shall be recorded.

5 to 9 show the configuration of a conventional serial printer. Fig. 5 is a perspective view showing the external appearance, Fig. 6 is a sectional view taken along the line Vl-Vl in Fig. 5, Fig. 7 is a plan view of the plink shown in Fig. 6, and Fig. 8 shows the configuration of a conventional carriage. The perspective view and FIG. 9 are perspective views showing other structures of the carriage.

In FIG. 5, the casing of the printer consists of a lower case 11, an upper case 2, and a front case 3, and has a printing mechanism incorporated therein. 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 multi-purpose cover that is rotatable for setting 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 1O shown in FIG. 6 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. 6 and 7, the print head 5 is constructed as a wire don't head and is mounted on a carriage 8 slidably provided on two guide rails 6. The printing hand 5 prints on the printing 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 10, which are rotatably pressed against the outer circumferential surface of the platen 7. The platen 7 is driven by the pulse motor 19 when feeding the paper, and the gears 20, 21, heald 25, and boot 1J2 are driven by the pulse motor 19.
6 in the six printing directions shown in FIG.

As the recording paper, fanfold paper 14, roll paper 17, or cut paper 18 can be used. In the case of fanfold paper I4 and roll paper 17,
A tractor 12 with pins 12a protruding from the outer peripheral surface at predetermined intervals.
is conveyed by rotating in the direction of arrow B. 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 the rotating shaft 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. still,
A printed circuit board 23 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 lO, 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, for the carriage 8, a die-cast molded product shown in FIG. 8 or a molded product shown in FIG. 9 is generally used.

In FIG. 8, 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 - side. The bearing 41 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. 9, a U-shaped guide holding part 44 is integrally molded on 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 for fixing the print head 5 is provided at the upper part of the bearing part 43. 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.

In addition, when using Guicast, 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.

〔the purpose〕

The purpose of the present invention is to provide a thermal printer that can solve the problems of the prior art, minimize the MN and size, minimize the effects of shape changes due to temperature, etc., and achieve dimensional stability. It is to provide a carriage.

[Means for solving problems]

The present invention achieves the above objects by producing a carriage main body by press working and integrally processing a bearing on the bearing part by an outsert method, thereby preventing an increase in weight and enabling high-speed printing. It is.

[Effect]

According to the above means, the press-formed carriage body contributes to weight reduction, and the bearing that is out-nourished to the shaft portion can meet the strength required for the bearing, so the bearing is press-fitted into the bearing portion or bonded. , a carriage for a serial printer can be constructed without using means such as thermal welding.

〔Example〕

The present invention will be specifically described below with reference to FIGS. 1 to 4.

FIG. 1 is a perspective view showing an embodiment of a carriage according to the present invention, and FIGS. 2, 3, and 4 are a developed plan view, a front view, and a side view of the embodiment of FIG. 1.

In FIG. 1, a carriage body 50 has a bearing portion 51 formed at both ends of one longitudinal side, and a guide portion 51 on the other side.
2 is formed. Furthermore, a bead 53 is formed in the center to provide a predetermined strength. Bearing part 5
1 has a hole of a predetermined diameter, and a bearing 54 is fitted into each of the holes. A supporter 55 for steadying is provided on the flat part near the guide part 52, and
A supporter 56 is provided at a portion of the guide portion 52 that faces the supporter 55 .

The bearing portion 51 is bent at right angles to the plane portion, and a rib 57 is formed at the bent portion to provide a predetermined strength. Further, the guide portion 52 is bent into an L-shape, and ribs 58 and 59 are also formed on each of the bent portions.

The carriage body 50 is a 5pc
A rolled material such as C can be used. Further, the bearing 54 is made of polybutylene terephthalate (in some cases, glass fiber or the like is mixed in to further increase the strength), Teflon,
It is made using a material with excellent oil and wear resistance such as polyimide, and its shape is determined by the effects of the head temperature rising during driving, the effects of heat caused by friction between the guide rail and the bearing 54, and the surrounding environment. Because it is affected by changes in environmental conditions such as temperature and humidity, it is necessary to minimize these effects.

The manufacturing process for the above configuration will be explained next.

First, as shown in FIG. 2, a flat carriage body 50 without the members shown in the shaded areas is punched out, and at the same time, the beads 53 are pressed.

Next, the bearing 54 is fixed to the bearing part 51 by an outsert molding method, and the supports 55 and 56 are fixed to the flat part and the guide part 52 by insert processing. Next, the bearing part 51 and the guide part 52 are bent by a press as shown in FIGS. 1 and 3, and ribs 57, 58 and 59 are formed.

In the carriage assembled as described above, the guide rail 6 is inserted into the bearing 54 as shown in FIG. 4, and a steady rest guide shaft 60 and the like are disposed between the supports 55 and 56.

The bearing forming means described above can be widely used not only for carriages but also for mounting bearings and the like as separate parts on plate members.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the bearing is integrated into the shaft portion of the carriage body by press working by outsert molding, so that the amount of deformation of the shape due to temperature changes etc. is minimized, and the size Provided is a serial printer carriage that can increase stability, reduce weight by reducing the amount of material used in the main body, and enable faster printing.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the carriage according to the present invention, FIGS. 2, 3, and 4 are developed plan views, front views, and side views of the embodiment of FIG. 1, and FIG. FIG. 6 is a cross-sectional view of the printer shown in FIG. 5 taken along the V[-Vl arrow, FIG. 7 is a plan view of the printer shown in FIG. 6, and FIG. 8 is a conventional carriage. FIG. 9 is a perspective view showing the structure of another conventional carriage. 5------Print head, 6---Guide rail, 50-- Carriage body, 51--
−・・−・−・・Bearing portion, 52 −− Guide portion, 5
3-...--Bead, 54--One bearing, 55.56-...-Supporter, 57.58.
59・----・−・ Rib. Agent Patent Attorney Yasushi Oto Grain cylinder Fig. 1 Fig. 3 Fig. 4 Fig. 5

Claims (1)

[Claims] (1) In a serial printer that prints while moving the print head along a guide rail or the like using a carriage in a direction perpendicular to the conveying direction of the recording paper, at least a bearing section and a space for mounting the print head are formed by press working. What is claimed is: 1. A carriage for a serial printer, comprising: a carriage main body; and a bearing that is outsert-molded on the bearing portion and pivotally supports the guide rail, etc.