JPH02215570A - printing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a printing device.

2. Description of the Related Art Conventionally, many printing devices have been used in which printing is performed by scanning a carriage from side to side along a sheet of paper with a carriage equipped with printing means such as a dot impact head or a thermal head.

A conventional printing device will be explained below.

FIG. 5 is an exploded perspective view of the main parts of a conventional printing device, where ■ is a rear frame provided with a hole 1a and has an L-shaped cross section;
3 is a front frame, 3 is a right side plate, and 4 is a left side plate, and the rear toolem 1, front frame 2, right side plate 3, and left side plate 4 are fixed to each other by caulking. 5 is a wire row 16 by a carriage motor (omitted in the figure).
7 is a driven pulley; 8 is a threaded portion 8a; the pulley mounting member that is held on the left side plate 4 and rotatably holds the driven pulley 7; 9 is a member at both ends of the wire rope 6; The fixing member 9 is fixed to a carriage (not shown) on which a printing means (not shown) is mounted. Reference numeral 10 designates a shaft that is fixed in the hole 1a and supports the drum gear 5 rotatably in a cantilever manner, and 11 is a nut that is screwed into the screw 8a.

The assembly of the conventional printing device configured as described above will be described below.

First, with the rear frame 1, front frame 2, right side plate 3, and left side plate 4 fixed by caulking, the drum gear 5 on which the wire rope 6 is wound in advance is fixed to the rear frame 1 by the shaft 10, and then the wire rope 6 is hung on the driven pulley 7, and the member 8 holding the driven pulley 7 is fixed to the left side plate 4 with a nut 11. Then, with both ends of the wire lobe 6 fixed to the fixing member 9 and the wire row 16 stretched as shown in FIG. 6, the fixing member 9 is attached to the carriage.

Problems to be Solved by the Invention However, in the above conventional configuration, the drum gear 5 is held cantilevered by the rear frame 1, and the pulley holding member 8
is held on the left side plate 4, but the wire lobe 6 is normally only under tension. ,
A bending load is applied between the rear frame 1 and the left side plate 4 each time the carriage moves back and forth, which may cause distortion. In addition, in this conventional example, it is necessary to assemble the drive system after fixing the rear frame, front frame, right side plate, and left side plate, but in this case, since the frame has already been assembled as a large frame, the orientation of the frame must be adjusted at the time of assembly. It is difficult to change it frequently and has the problem of poor workability.

Means for Solving the Problems The present invention includes a subframe having a U-shaped cross section and consisting of two side plates and a top plate. It is equipped with an elastic member that holds the plate, holds the driven pulley by the plate, and urges the plate outward.

Operation With the above configuration, the drive pulley is supported on both sides by the side plates, and is supported on the inside of the U-shaped frame together with the driven pulley.

Embodiment FIG. 1 is an exploded perspective view of a printing device according to an embodiment of the present invention, in which 5 is a drum gear, 6 is a wire lobe, 7 is a driven pulley, and 9 is a fixed member, which have the same structure as the conventional example. belongs to. 20 is a top plate 20a and a side plate 20b
, 20c, and is a U-shaped subframe that supports the drive system of the carriage (omitted in the figure). Hook groove 20f
A slide groove 20g is formed in each of the first side plates 20b and 20c, and a hook 20h is formed at one end. 21 is a pulley holding member formed with hooks 21a and 21b, which is rotatably held on the top plate 20a by hooking the hook 21a into the hook groove 20f, and rotatably holds the driven pulley 7; 22 is the hook 20h and the hook; The spring 23 is attached between the wire ropes 21b and 21b and applies tension to the wire rope 6. As shown in more detail in FIG. The shaft 24, which is pulled outwardly by the lever 22 and rotatably holds the driven pulley 7, is attached to the holes 20d and 20e as shown in more detail in FIG. a shaft 2 that is held in a state where it is held on both sides and rotatably holds the drum gear 5;
A carriage motor 5 is fixed to the side plate 20b and drives the drum gear 5.

FIG. 4 is a perspective view of the main parts of the printing device of this embodiment, and 26
27 is a carriage, 27 is a printing hammer mounted on the carriage 26, 28 is a platen that supports paper (not shown) from the back side, 29 and 30 are side plates, and 31 is a front frame.

Regarding the printing device of this embodiment configured as described above,
The assembly will be explained below.

First, the drum gear 5 on which the wire rope 16 is wound in advance is fixed to the subframe 20 by attaching the shaft 24 to the holes 20d and 20e, and then the driven pulley 7 on which the wire rope 6 is hung is attached to the slide groove 20 by the shaft 23.
g, and by attaching the hook 20a to the hook groove 2Of, the pulley holding member 21 is attached to the subframe 20.
Rotatably attach to. Then, both ends of the wire rope 6 are fixed to the fixing member 9, and finally the spring 22 is attached to the hook 21b.
and 20b. In this state, as shown in FIG. 2, the drive system of the carriage 26 is completely assembled, and by assembling the rear side plates 29 and 30 and the front frame 31, the frame is completed.

Effects of the Invention The present invention is provided with a subframe having a U-shaped cross section and consisting of two side plates and a top plate, and a drive pulley is supported by both side plates. The drive pulley is supported on both sides by both side plates, and the drive pulley and the driven pulley have the above-mentioned U-shaped cross section. Because it is supported inside the subframe of the mold, the drive pulley does not tilt due to the tension generated when the carriage reciprocates, and even when the carriage reciprocates, no bending load is applied between the side plate and the subframe. In addition, since the drive system is all built into the subframe, it is not only easy to handle during assembly and has good workability, but also minimizes assembly errors and achieves high positioning accuracy. be able to.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a main part of a printing device in an embodiment of the invention, FIG. 2 is a perspective view of the main part, FIG. 3(a) is a perspective view of the main part, and FIG. 3(b) is a perspective view of the main part. 4 is a perspective view of the same, FIG. 5 is an exploded perspective view of the main part of a conventional printing device, and FIG. 6 is a perspective view of the main part. 5... Drum gear, 6... Wire rope, 7...
Driven pulley, 9... Fixed member, 20... Subframe, 20a... Top plate, 20b, 20c = bond plate, 20d
, 20e...hole, 2Of...hook, 20g...
Slide groove, 20h...Hook, 21...Pulley holding member, 21, a, 2 l b-...Hook, 2
2- Spring, 23 Shaft, 24 Shaft, 25 Carriage motor, 26 Carriage, 27 Printing hammer, 28 Platen, 29.30. ...Side plate, 31...Front frame q-
mχi'P mark L---Pupuf L-4 2-・-Large version 22-IX'f1 Name of agent Patent attorney Shigetaka Awano and 1 other person 5-! Lamuia G---Wire Robe 7-fk Kuraka Futsu 2S---Ichigo Yari-/! ;Dehitta 2C--1↑Yarit C 27---India Hasomar 28--Purapower 29, 30-11 flight j Ma 10. -Sumaru Fray 4 Irr-・2-・Liquid size 7L-4 3・-145Isan 11J Tsugu: 1-1・8111! 5-NiuAia9,--Hyakusei-sho-da fO--da? 7th

Claims (1)

[Claims] A sub-frame is provided with a U-shaped cross section consisting of two side plates and a top plate, and has a width exceeding the printing area, a carriage motor is fixed to one end of the sub-frame, and a drive pulley is driven by the carriage motor. is supported between the side plates in a dual support structure, a plate is held at the other end of the subframe so as to be displaceable in the longitudinal direction of the subframe, a driven pulley is rotatably held by the plate, and the plate is An elastic member that is biased in a direction away from the carriage motor is attached to the subframe, a rope is wound between the drive pulley and the driven pulley, and the carriage is equipped with a printing means and is slidable in the longitudinal direction of the subframe. A printing device, characterized in that the rope is fixed to.