JPS60154302A - Improved manufacturing method for video head wiring fittings - Google Patents

Abstract

PURPOSE:To attain accurate insert forming by forming a prescribed projection strip and concaved slot to a small column of a metallic die so as to attain insert forming of a long and thin piece thereby arranging each lead wire of the long and thin piece in a correct parallel pitch. CONSTITUTION:Three projected strips 4a, 4b, 4c are provided to the metallic die d2 in the small column dies d1, d2 of the metallic dies D1, D2 for insert forming of the long and thin piece into the small column part 9 of a wiring jig main body (a). The two lead wires b, b of the long and thin piece are inserted respectively into the two concaved strip slots 5a, 5b formed by them so as to attain insert forming. The lead wires b, b are arranged in a correct parallel pitch in this way, accurate insert forming is conducted and the connection of the lead wires b, b in mistake is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The applicant of this application previously filed patent application No. 162391 filed in 1982.
, Title of the invention [Wiring tool for video head and method for manufacturing the same]
The applicant filed an application for an invention for the structure and manufacturing method of a wiring tool used for wiring the head portion of a video tape recorder, but the claimed invention is an improvement on a part of the manufacturing method related to the earlier application. be.

In other words, all the wiring for the head section of conventional video tape recorders uses ordinary covered wires cut to a set length as lead wires, and these are soldered to the head printed circuit board and relay printed circuit board in extremely narrow positions. The previous application stopped using one lead wire using the above-mentioned covered wire and soldering it because the workability was extremely poor and high precision could not be expected because of the connection. , developed a wiring tool with a configuration in which the required number of lead wires are fixedly arranged to match the target position, and by using this wiring tool, the wiring connection between the head and the relay printed circuit board can be made extremely easily. The present invention has been developed to enable high-efficiency and high-precision manufacturing, and has developed a manufacturing method for easily mass-producing the wiring fittings with high efficiency and high precision. With some improvements to the law,
When insert molding a strip into a small column, by adding a special configuration to a part of the small column mold in the mold, each lead wire portion of the strip can be inserted into the small column with accurate parallel spacing. It is designed so that it can be placed in the correct shape and then insert molded.

Hereinafter, an improvement in the manufacturing method of the wiring fitting according to the present invention will be described. A thin plate of an appropriate conductive metal (e.g., luminous metal, copper, etc.) is press-formed, and slits 6 are made in the longitudinal direction.
The elongated strips 7 with the left and right sides serving as lead wire portions are arranged radially (in four directions in the illustrated example) in accordance with the number of henots (usually 2 to 5 heads, 4 heads in the illustrated example) (see Fig. 3). of(
a)) or individually (four illustrated examples) ((a)' in Fig. 3), each strip 7 is bent into one shape (b), (b)
However, shaping can also be done after the injection molding process. ), the curved part is placed on the upper surface of the ring-shaped part according to the number and position of the henots in the boot 111, and the small pillars 9 (four in the illustrated example) are attached.
is set in the trabecular mold dum, d2 of the mold pi, l) 2 for molding the wiring fitting main body a having a structure in which the wiring fitting main body a is vertically protruded, and the wiring fitting main body a is formed by the mold. When molding is performed using insulating plastic, the curved elongated piece 7 is inserted into the small column part 9 at the same time. Next, the molded product ((...), (...)') is Cut the upper and lower ends of the strip 7 exposed from the upper and lower ends of the small pillar part 9.
Then, each lead wire B is separated into individual lead wires B, and the upper and lower ends of the lead wires B are slightly exposed in the small pillar part 9 of the wiring tool body a, which consists of a ring-shaped part and a small pillar part 9. In the method for manufacturing a wiring fitting for a video head according to the previous application, in which a wiring fitting A having a configuration in which the wiring fitting A is buried in Sudame mold [)l, D2 trabecular mold d1%d
Three protrusions 41-a%ψ of set length on one mold d2 of 2
b, ψC protrude in parallel, and the protrusions q, a, ψb, ψC
The two lead wire portions S and B of the elongated piece 7 are inserted and positioned separately into the two groove grooves 3a and Sb formed between them by insert molding, thereby forming the mold. The lead wire portion b is on the side surface of the small pillar portion 9, and b is the convex strip ta.
, vb, grooves /3a, /3b' formed by ψC
,/, :? Insert molding is performed in a parallel state with accurate compartmentalization separated by C.

Note that there is a groove/3a in the small pillar portion 9 of the wiring fitting main body a.

6 sales of mold d2 forming 13b%/3c≠a1Q-b
%11 c ij All three grooves 13a, /,? b. Even if the 13 pins are protruded long enough to be formed, as shown in the example shown, the central protrusion t/-b is still long, and the left and right protrusions/7a%φC are close to the ring-shaped part. It is optional to protrude only the lead wires d2, and in short, it is acceptable as long as the protruding structure of the mold d2 has a length that allows insert molding to be carried out while holding the lead wires a and b in a parallel state.

Thus, the wiring fitting A manufactured as described above, that is, the wiring fitting main body a consisting of the ring-shaped portion and the small pillar portion 9 made of insulating plastic.
The wiring fitting A is formed by burying the lead wire B in the small pillar portion 9 with its upper and lower ends slightly exposed.
The small pillar part 9 is inserted into the hole 1/ drilled in advance in the hole 1, and the boot 11 is inserted.
1, and connect the ends of each lead wire B to a predetermined position of the printed circuit board 2', etc. on the henotoko side, and the relay printed circuit board 3 by soldering C, and connect both 2.
．． This completes the wiring between the three. In addition, at this time, it is also possible to bend the lead wire B in the vertical direction and pierce it through the printed circuit board. Reference numeral 12 designates a positioning dowel for determining the orientation (with respect to the head) of the wiring fitting A when inserting the small column portion of the wiring fitting A into the hole 1ivc.

As described above, by insert-molding the lead wire portions A and B of the elongated piece 7 into the small pillar portion 9 of the wiring main body A, an effect similar to a missing portion is produced.

That is, when the insert 1 is molded according to the manufacturing method of the previous application, the strip 7 (e.g., made of a thin plate of luminium, copper, etc.)
The lead wire portion l) is extremely thin (for example, diameter 0.3
O, s tmn ), the distance between the two parallel wires is narrow (e.g., 0.7 mm), and the distance between them is relatively long (e.g., 15 mm).
~20 questions) During handling before inserting the mold, or when inserting the mold into the mold, the lead wires A and B may bend or bend and come into contact with each other. Also, as mentioned above, the lead wire part b% b is long and thin.
Because of the narrow parallel spacing, during injection molding, the 1J-wire parts S and B are often deformed by the plastic injection pressure, and as a result, the lead wire parts S and B may come into contact with each other. However, there was a risk that a part of the small column part 9 would be exposed on the outer circumferential surface of the small column part 9, and come into contact with the inner surface of the hole of the pulley 7, causing a short circuit. According to the above-mentioned manufacturing method improved by the present invention, during insert molding, the lead wire portions S and B are connected to one mold d2.
The 11-wire g is inserted into the concave groove Ja, 5b.
(The parallel state of ibl b is forcibly maintained. Since plastic injection molding is performed, the lead wire part is
Deformation etc. before setting into the mold of b is a concave groove,! ia, jb
It is corrected when it is bent, and it is held in the four-striped grooves 3a and 3b during injection so that it will never be misaligned or deformed due to injection pressure, etc., so that after releasing the mold, the lead wire part b,
b is convex! a, Ilb, (groove formed by 1-c/3
As /3b, /3c are separated by insert molding with accurate parallel spacing, so the lead wire 1gIX
An excellent method that can completely eliminate the risk of insert molding with parts b and b erroneously in contact with each other, or insert molding with a part of lead b1b exposed on the outer peripheral surface of the small column part 9. It can demonstrate its characteristics.

[Brief explanation of the drawing]

(a), (a)', (o), (b)', (c) in Figure 1
, (c)' and (d) are explanatory diagrams showing the manufacturing method 11 (L1 order) of the present invention, and Fig. 2 shows wiring using an example of the wiring tool according to the present invention in a pulley with a head and relay printed circuit board attached. A partially cutaway front view, a top view, and a bottom view showing the condition, and Fig. 3 are partially enlarged views of an example of the wiring device, (a) is a plan view, (b) is a left side view, (... lj: A of (b)
'-A'' cut-away view, FIG. 4 is an explanatory diagram showing the sequence of insert molding a lead wire part into a small column part using the improved mold according to the present invention, and FIG. It is an explanatory view of insert molding a lead wire part in a small column part by a mold. Numbers, A... Wiring tool for a video head manufactured by the method of the present invention, a... Wiring tool body, B... Lead line,
b... Lead wire part, C... Soldering, DI, D2
... Mold, dl, dl... Small pillar part mold, L... Pulley, Co... Head, Yu' - Its printed circuit board, 3...
Relay printed circuit board, l/-a, ψb, l/-c...Convex strip,! a1! ;b...concave groove, 6...s) 1 throat, 7
...Groove. Figure 1 Figure 1 Procedural amendment (method) 1Mi Jl+ 59i "May 221" 1988 Special
Relation to Case 7 of Patent Application No. 8988 Patent applicant 4, agent (1), on the fourth off line of the specification, it says "Figure 3".
In the 8th line of the same letter, does it say "(i)' in Fig. 3" and "(i) in Fig. 1"? ttiEL,, in the 9th line of the fourth o, ``(b)
``1'' has been amended to ``(ro),'' and in the 19th line, ``(c)'1 has been amended to ``(ha) J.'' (2), Statement 1 From the 75th line of the 9th stroke to the 6th line of the O, “(i,), (i)′, (b), (b)′, ()・), ()・
)′” is replaced with “(i), (i), (b), (ro),
(Ha), (ha),” Neko says. (3), as shown in the attached sheet, the subdivision numbers in Figure 1 are (a)', (
Delete the words ``b)'' and ``(...)'' and replace them with (i) respectively.
, (ro), (ha) and 1IIIE.

Claims (1)

[Scope of Claims] 1) A suitable metal thin plate is press-molded, and slits are formed in the longitudinal direction, and elongated pieces with lead wire portions on the left and right sides are provided radially according to the number of heads, or Alternatively, each strip is provided individually, and each of the strips is used as a small column part mold of a spare mold to form a wiring device body having a configuration in which small column parts are vertically protruded from the top surface of the ring-shaped part in accordance with the number and position of the heads. When the wire fitting main body is molded from insulating plastic using the mold, the strip is simultaneously insert-molded into the small pillar part, and then the small pillar part of the molded product is molded. Cut the upper and lower ends of the strips exposed from the upper and lower ends of the part, separate each lead wire part as each lead wire, and insert the lead wire into the small pillar part of the wiring fitting body, which consists of a ring part and a small pillar part. In a method of manufacturing a wiring fitting for a video head, in which wiring fittings are provided with the wiring fittings buried with the upper and lower ends slightly exposed, a small pillar part mold is used for insert molding each of the above-mentioned strips into the small pillar part. On one of the molds, ←≠ Myo ridges of a set length are protruded in parallel, and in the ≠ Gyu-red concave grooves formed by the ridges,
Insert molding is performed with the needles of the elongated piece ≠ the lead wire parts inserted and inserted separately, so that the lead wire parts are insert-molded in an accurate parallel state to the side surface of the molded small column part. An improvement in the manufacturing method of a wiring fitting for a video head, characterized by the following.