JPH0437559A - Attraction-type dot printing head - Google Patents

Abstract

PURPOSE:To ensure that each part is positioned in alignment and is assembled easily by holding the entire assembly collectively using a spring member after stacking each constituent part. CONSTITUTION:A guide frame 7 which positions and holds a printing wire 1, a printed circuit board 8 for connection of a magnet 6 and a core 18a of the magnet 6 are provided and a core base 18 with a recessed part 18b on the peripheral lateral surface, an insulating board 10 which insulates the core base 18 against a printed circuit board 8, a printing wire 1 and a guide member 12 which positions and holds an armature for driving the printing wire 1 are stacked. Then a protrusion 19a is allowed to engage with a recessed part 18a and the engaged part is clamped in such a manner that the whole assembly is held by a spring member 19 with a fulcrum present at a guide frame 7 side and the protrusion 19a provided on the lateral side. The printing wire 1 is introduced in the guide frame 7 and also the armature 5 is assembled.

Description

[Detailed Description of the Invention] [Summary] Regarding the structure of a suction type wire dot print head, the present invention aims to improve the assemblability of the print head and reduce costs on the premise of mass production, and to position and hold the print wire. guide frame,
A printed circuit board for connecting the electromagnet, a core base on which the core of the electromagnet is erected and a recess on the outer peripheral side, an insulating plate for insulating between the core base and the printed circuit board, and a printed wire provided on the core base. and a guide member for positioning and holding the armature that drives the printing wire, and the protrusions are held by a spring member having a fulcrum on the guide frame side and having a protrusion on the inside of the side surface. The printing wire is locked and clamped in the recess, and then the printing wire is inserted into the guide frame and the armature is assembled.Furthermore, the spring member is extended beyond the protrusion and provided with a hole at the tip, and the armature is inserted into the guide frame. a rear end positioning guide; a spring means for pressing the rear end of the armature;
A stopper that blocks the tip of the armature and a board that mounts and supports each component and has a convex portion on the outer circumferential side are stacked, and after abutting against the stacked parts body, the entire body is secured with a spring member. The convex part is engaged with the hole part to clamp it. Further, the spring member is configured by bringing the ground member of the printed circuit board into contact with the spring member.

[Industrial Field of Application] The present invention relates to the structure of a suction type wire dot print head.

Wire dot printers are becoming popular for personal use because they are easier to use and handle and have lower running costs than printers using other printing methods.

There is a demand for further reduction in price of these printers.

(Prior Art) As shown in the side view of FIG. 2(a), a suction type wire dot print head has a printing wire 1 and a spring member 2 that press the tip of the print head against a stopper 4 in the center of a substrate 3. It is composed of an armature 5 that impinges and an electromagnet 6 facing the armature 5. By attracting the armature 5 with the excitation of the magnet 6, the printing wire 1 is fixed to the tip of the armature 5.
is made to protrude from the guide frame 7 for printing.

The assembly of this print head consists of a guide frame 7 that positions and holds the print wire 1, and an i! A printed circuit board 8 for connecting the electromagnet, a core base 9 on which a plurality of cores 9a of the electromagnet 6 are installed, an insulating plate 10 for insulating between the core base 9 and the printed circuit board 8, and a printed circuit board provided on the core base 9. The wire 1 and the guide member 12 for positioning and holding the armature 5 that drives the printing wire 1 are overlapped, and as shown in the front view of the same figure and the same figure (b), a plurality of screws 13 are inserted from the guide frame 7 side. and a positioning guide 14 for positioning the armature 5, the rear end of the armature 5, and the armature 5, as shown in FIG.
A spring member 15 that presses the rear end, and a stopper 4 that is biased by the spring member 2 and blocks the tip of the armature 5.
and the substrate 3 that supports each of the above-mentioned parts, and abut against the assembled parts of the seven examples of guide frames assembled previously, and as shown in the rear view of the same figure and the same figure (C), the side of the substrate 3 is overlapped. It is fixed together with multiple screws 13'.

Finally, as shown in Figures (a) and (b), in order to ground the printed circuit board 8, insert the screw 13'' into the tapped hole of the core base 9, sandwiching a predetermined pattern on the printed circuit board 8. Screw it together to make it conductive.

[Problem to be solved by the invention] As explained above, assembly is mainly done by stacking each component and then fastening it using a large number of screws. There are problems in that it is expensive, requires a large number of man-hours for assembly, and is difficult to meet the demands of mass production.

The present invention aims to improve the assemblability and reduce costs of a print head on the premise of mass production.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a guide frame 7 for positioning and holding the printing wire 1, and a printed circuit board 8 for connecting the electromagnet 6, as shown in the side view of FIG.
Then, the core 18a of the electromagnet 6 is set upright, and the recess 1 is formed on the outer peripheral side surface.
8b, an insulating plate 10 that insulates between the core base 18 and the printed circuit board 8, and an armature 5 that is provided on the core base 18 and drives the printing wire 1 and the printing wire 1. The guide members 12 to be held are piled up and held by a spring member 19 having a fulcrum on the guide frame 7 side and a protrusion 19a on the inside of the side surface, and the protrusion 19a is locked in the recess 18b and clamped. After that, the printing wire 1 is inserted into the guide frame 7 and the armature 5 is assembled, and the spring member 19 is further extended beyond the protrusion 19a and has a hole 19b at the tip. A guide 20 for positioning the rear end of the armature 5, a spring means 21 for pressing the rear end of the armature 5, a stopper 4 for blocking the tip of the armature 5, and these components are mounted and supported. At the same time, the substrate 23 having the convex portion 23a on the outer circumferential side is stacked, and after abutting against the above-described stacked component body, the whole is held by the spring member 19 and the convex portion 23a is engaged with the hole 19b. The spring member 19 is then clamped, and the ground member 24 of the printed circuit board 8 is brought into contact with the spring member 19.

[Effect]

After stacking each component, the whole is held together by a spring member, so that each component can be positioned without shifting, and assembly is facilitated.

〔Example〕

FIG. 1 shows an embodiment of the present invention.

Identical parts are designated by the same reference numerals throughout the figures.

In the present invention, as shown in the side view of FIG. 1, in order to simplify assembly, fastening using screws is eliminated and a two-step clamping structure is adopted using a spring member.

That is, as in the prior art, a guide frame 7 for positioning and holding the printing wire 1, a connecting printed circuit board 8 for energizing the electromagnet 6, and a plurality of cores 18a of the electromagnet 6 are installed upright and the outer periphery thereof. Recessed part 18b on the side
an insulating plate 10 that is inserted between the core base 18 and the printed circuit board 8 to insulate them from each other; a printing wire l provided on the core base 18; and a printing wire 1 for driving the printing wire 1. The guide member 12 for positioning and holding the armature 5 is stacked on top of the guide member 12, which has a fulcrum on the guide frame 7 side and a protrusion 19a on the inner side of the side surface so as to bias it inward in the circumferential direction. It is held by a spring member 19 made of a stainless steel plate, for example.

Then, for example, three protrusions 19a of the spring member 19 are engaged with, for example, three recesses 18b of the core base 18 and clamped, thereby performing temporary assembly.

In this state, connect the plurality of printing wires 1 to the guide frame 7.
A series of operations such as insertion and adjustment of the armature 5 are performed.

After these operations are completed, a positioning guide 20 for positioning the rear end of the armature 5 and a spring means 2 consisting of a leaf spring or the like for pressing the rear end of the armature 5 are installed.
1, a stopper 4 which is biased by a spring means 21 to stop the tip of the armature 5, and a substrate 23 on which each of these components is mounted and supported, and which has a convex portion 23a on its outer peripheral side. Intussusception.

The stacked parts assembly in this way is butted against the previously assembled parts assembly.

Then, the protrusion 23a of the substrate 23 is engaged with the hole 19b at the tip of the spring member 19 and clamped, and the entire assembly is fixed to complete the assembly.

During this assembly, a clip-shaped grounding member 24 protruding from the grounding pattern of the printed circuit board 8 automatically comes into contact with the inner surface of the spring member 19, as shown in the figure, so that the spring member 19 can be grounded.

In the above embodiment, the spring member 19 and the substrate 23 are fixed by engaging the convex portion 23a of the substrate 23 with the hole 19b at the tip of the spring member 19. A convex portion may be provided on the substrate 23, and the convex portion may be engaged with a concave portion provided on the substrate 23.

[Effects of the Invention] According to the present invention, each part can be easily positioned and fixed during assembly, and assembly requires only the accumulation of parts and clamping using spring members, reducing man-hours and lowering costs. It has great economic and industrial effects, such as the ability to achieve

FIG. 2(C) is a rear view of FIG. 2(a).

In the figure, 1 is the printing wire, 5 is the armature, 7 is a guide frame, 10 is an insulating plate; 13.13', 13'' are screws, 18a is the core, 19 is a spring member; 19b is a hole; 21 is a spring means; 23a is a convex portion.

4 is a stopper 6 is an electromagnet, 8 is the board, 12 is a guide member; 18 is core base, 18b is a recess; 19a is a protrusion; 20 is a positioning guide; 23 is a board; 24 is a grounding member.

[Brief explanation of drawings]

FIG. 1 is a side view of the suction type wire dot print head of the present invention, FIG. 2(a) is a side view of a conventional suction type wire dot print head, and FIG. 2(b) is a front view of the same figure (a). I f'A/) O Ashiki type Fui A but to 7F Kou...don
4 β 1st possible 0 (θ ) Nsu 斥・Fuireto θ month n suction ゛ Wu two Wai? To do/to printing, l'/) Ishizuki σ white bar] No. 1 Front view of RO β Wako (Q) (b) L old (91)

Claims (3)

[Claims] (1) A guide frame (7) for positioning and holding the printing wire (1), a printed circuit board (8) for connecting the electromagnet (6), and a core (18a) of the electromagnet (6) are erected; A recess (
18b); an insulating plate (10) for insulating between the core base (18) and the printed circuit board (8); Wire (
1) and an armature (
5) and a guide member (12) for positioning and holding them, and this is held by a spring member (19) having a fulcrum on the guide frame (7) side and having a protrusion (19a) on the inside of the side surface. The protrusion (19a) is inserted into the recess (18b) in such a manner as to
and then clamp the printing wire (1) to the guide frame (
7) A suction type wire dot print head characterized in that the armature (5) is assembled at the same time as the suction type wire dot print head is inserted into the print head. (2) The spring member (19) is extended beyond the protrusion (19a) and has a hole (19b) at the tip, and the positioning guide (20) for the rear end of the armature (5) is provided.
), and spring means (
21), a stopper (4) for blocking the tip of the armature (5), and a substrate (23) for mounting and supporting each of the components and having a protrusion (23a) on the outer peripheral side surface. After the spring member (
19), and the convex portion (23a) is engaged with the hole portion (19b) to be clamped. (3) The suction type wire dot print head according to claim 1 or 2, characterized in that the spring member (19) is brought into contact with the grounding member (24) of the printed circuit board (8).