Wireworking – Crimping
Patent
1980-08-18
1983-01-25
Goldberg, Howard N.
Wireworking
Crimping
295663, B21F 100
Patent
active
043698190
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an apparatus for bending the lead wires of electric parts and forming them into the shape of a staple, the electric parts having a body member and a pair of the lead wires extending coaxially in opposite directions from the body member and being, for example, previously arrayed on a tape at equal intervals therealong.
BACKGROUND ART
Prior lead wire forming methods of this type may be divided into two types. According to the first method as shown in FIG. 1, the lead wires of an electric part 1 is pushed by a pushing means 2 in a direction indicated by arrow A, so that they are forced into a pair of lead wire grooves 3a and 3b of the forming means 3 and formed and held therein. According to the second method as shown in FIG. 2, a pushing means 2 moves in a direction indicated by arrow B, so that the lead wires of an electric part are forced into lead wire grooves 3a and 3b in a chucking manner between a lever 4 and the pushing means 2 and formed and held therein. Since such methods, however, are forming methods based on the dimensions of the lead wires, in order to bend the lead wires as shown in FIG. 3, an additional length corresponding to the widths W of the contact portions of the pushing means must be provided in addition to the length L of a body member of an electric parts to reach the overall length of the part, thereby increasing the insertion pitch P on a printed circuit board. Therefore, the space required for each part when it is mounted on a printed circuit board must include the widths W, thereby making the printed circuit board larger and more costly than if such widths could be eliminated. Moreover the lead wires may be damaged by chucking between the pushing means 2 and the forming means 3.
BRIEF DESCRIPTION OF THE INVENTION
This invention, in order to solve the above described problems, provides a lead forming apparatus for electric part which depends on a method based on the dimension of the body member of an electric parts and in which the forming guide relatively moves for chucking the body member while the lead wires are formed into a staple-shape, thereby reducing the insertion pitch so as to make it possible to shorten a printed circuit board and eliminate the damage brought about by bending the lead wires of electric parts.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in greater detail in connection with the accompanying drawings, in which:
FIG. 1 and FIG. 2 are fragmentary perspective views of a prior art forming apparatus,
FIG. 3 shows a front view of an electrical part bent thereby;
FIG. 4 and FIG. 5 are horizontal sectional views of the principal portion of a forming apparatus according to one embodiment of this invention;
FIG. 6 is a vertical sectional view thereof; and
FIG. 7 is an enlarged sectional view thereof.
BEST MODE FOR CARRYING OUT THE INVENTION
Referring to FIGS. 4-7, a piston 5 is provided which is slidable in the direction indicated by arrow C in FIG. 4 and to the top portion of which forming guides 6 are attached. Cutters 7 which are provided with cutter blades 7a, are slidably mounted on both exterior walls of the forming guides 6 and slide relative to stationary cutters 8 located on the outer side thereof to cut off the lead wires. The cutters 7 are guided by the stationary cutters 8. Balls 9 are fitted into holes 7b formed in the cutters 7 and engage in recesses 6a in guides 6 so that the forming guides 6 and cutters 7 will move together. Cutting blades 8b are formed on the outer end of the stationary cutters 8. A pusher 10 is slidably mounted in the forming guides 6 for lengthwise movement therein. A soft member 11 is attached to the front or outer end thereof and the pusher 10 is coupled through a compression spring 19 to the piston 5. Guide grooves 12 are formed in the interior walls of the forming guides 6 for receiving and the lead wires therein and guiding them. Another soft member 13 is spaced forward of or outwardly of and opposed to the soft member 11. The two soft members 1
REFERENCES:
patent: 3267716 (1966-08-01), Hales
patent: 3692069 (1972-09-01), Clendennen et al.
patent: 3738398 (1973-06-01), Galloway
patent: 3993108 (1976-11-01), Kirschenman et al.
Kinoshita Hiromi
Maeda Yoshinobu
Tanno Tadashi
Goldberg Howard N.
Matsushita Electric - Industrial Co., Ltd.
Silverberg Fred A.
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