JPS6137052B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for inserting a terminal pin into a board such as a printed circuit, and more specifically, the notch portion is so formed that the sheared pin has a tapered end and no burr. The present invention relates to an apparatus for implanting terminal pins using a chain-like pin formed and continuous in the length direction.

When manufacturing electrical products, it is often necessary to implant a large number of upright terminal pins onto a printed circuit board. For example, terminals to which external lead wires are connected must be implanted on the printed circuit board. Various types of devices are known that use continuous wire to feed, shear, and drive terminal pins into substrates. However, such conventional devices and the terminal pins inserted therewith have a drawback that the terminal pins that are sheared and inserted into the board have a flat sheared surface at their terminal ends.

In particular, when wire wrapping work is performed to electrically connect lead wires from the outside to terminal pins, the terminal pins inserted and implanted using conventional equipment have flat sheared surfaces as described above. Undesirable. In fact, many manufacturers who must make electrical connections to printed circuit boards using wire wrap methods do not use terminal pins that do not have tapered ends. Indeed, if the terminal pins are not tapered, it is difficult to perform wire wrap operations to make electrical connections to printed circuits.

Another problem with conventional devices for inserting and implanting terminal pins into printed circuit boards, which is somewhat related to the fact that the ends of the insertion pins are flat sheared surfaces, is that
During the shearing operations required to form the individual pins, undesirable debris remains on the sheared pins. The thicker the wire, the more difficult it is to perform the shearing operation and, furthermore, significantly larger burrs are produced.

According to the present invention, a notch portion is formed at a location corresponding to the length of the terminal pin to prevent burrs from appearing when sheared, and a chain-shaped pin that is continuous in the length direction is used. a reciprocating motion feeding mechanism that has a feed pawl that engages with the notch portion and sequentially advances the chain pin toward the board, and inserts the terminal pin sheared at the notch portion into the opening of the board; In an apparatus for inserting a terminal pin into a board, the device includes a shearing mechanism for shearing one of the terminal pins from the pin at the notch portion, wherein the shearing mechanism moves together with the feed pawl, and the cutting edge of the shearing blade of the shearing mechanism is set at a certain distance from the feed claw,
The device is characterized in that the certain distance is an integral multiple of the length of the one terminal pin, and further, the reciprocating feeding mechanism has a pin holding mechanism for press-fitting the sheared terminal pin. provide.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings in which embodiments thereof are shown.

In the drawings, like reference numerals are used to designate like parts, and the illustrated device 10 according to the invention has a frame, generally designated 12, within which the motor 1 is mounted.
4 are installed. Shaft 16 is pulley 18
, whose rotation is transmitted to the main shaft 22 by a V-belt 20 through an intermediate and selective mechanical element, generally designated 24, of a conventional solenoid operated single rotation clutch. The main shaft 22 is rotatably supported by bearings 25 and 26 supported by the frame 12. At the leftmost end of the main shaft 22 (in FIG. 1),
A crank 28 exhibiting a pin 30 is supported. A pin 30 and a sliding member 3 that reciprocates in the vertical direction
A member 32, which is a pin 34, is interposed between the two members 6 to convert rotational motion into reciprocating motion. A block 38 is secured to the slide member 36 and supports a feeding mechanism, generally designated 40, a shearing mechanism, generally designated 42, and a retaining mechanism, generally designated 44. will further elaborate on the details of all these mechanisms.

The eccentric cam 46 is keyed to rotate with the main shaft 22, the cam surface moves the follower 48 up and down, and the lower end 50 of the follower passes through the frame 12 and is pivoted to the frame by a pivot shaft 56. bell crank rod 5
4 at the rightmost end 52 (in FIG. 1). The bell crank rod 54 is normally pressed counterclockwise about its pivot axis 56. However, follower 4
8 is pushed by the eccentric cam 46, the bellcrank rod 54 rotates clockwise and drives the cutter actuating plunger 58 to the left as viewed in FIG. Shear the book terminal pin LP from the chained pin SS (4th
(See Figures), compression spring 62 normally biases shear plunger 60 into its non-shear position (to the right as viewed in Figure 1).

As shown in the drawing, in the chain pin SS, the terminal pin 64 is made of a conductive wire continuous in the length direction,
As shown in FIG. 1, it is housed in a coil 65 and is successively advanced by reciprocating feed mechanism 40 in the manner described with reference to FIGS. 2-4. As shown, each of the terminal pins 64 has a tapered end 6
6 and corresponds to a notch portion before the terminal pin 64 is sheared.

In one embodiment of the invention, as shown in FIG. 5, the terminal pin 64 has a rectangular or square cross section so that the tapered end has a prismatic shape. In embodiments where the terminal pins are rectangular or square in cross-section, the largest dimension shown at 68 in FIG. By doing so, an interference fit is obtained.

In another embodiment of the invention, as shown in FIG. 6, the chain pin is formed of a wire having a circular cross section. In this embodiment, the diameter of the terminal pin, designated 74 in FIG. 6, is smaller than the diameter of the opening 70 in the substrate 72 into which the pin is inserted. Therefore,
In this embodiment, by forming an enlarged portion along the length of each terminal pin, as shown at 76 in FIG. is obtained.

The chained pins used in the device according to the invention are:
A conductive wire with a rectangular, rectangular, or circular cross section is passed through a notch mold of an appropriate shape, and the raw material is cut out to form a notch portion, which is continuous in the length direction. If the raw material is circular, each terminal pin is further swaged to form an extension as shown at 76 in FIG.

In FIG. 2, the reciprocating feed mechanism 40 has a feed pawl 80 pivotably mounted around a rotation shaft 82 supported by a guide block 84. As shown in FIG. A slot 86 is drilled in the guide block 84 and a screw 88 is inserted into the guide block 84.
It is fixed to the block 38 by the screw hole 8.
8, the position of the guide block 84, and thus the position of the feed pawl 80, can be changed along the length of the block 38 within the slot 86.

The feed pawl 80 is normally pressed by a small spring 90 to rotate clockwise about the rotation shaft 82 . An end 92 of the feed pawl 80 is shaped to enter and engage a notch 94 formed between one terminal pin 64 and an adjacent terminal pin 64.
Therefore, when the sliding member 36 and the block 38 move from the state shown in FIGS. 1 and 2 toward the substrate as shown in FIG.
The end portion 92 of the feed pawl 80 is pressed and engaged with 4.
The chained pin SS is advanced toward the substrate 72 by. Next, when moving in the direction away from the substrate, the feed pawl 80 is moved generally at 96 in FIG.
The chain pin is held stationary by an anti-return ratchet device, as shown in FIG.
2 moves on chain pin SS.

The backlash prevention ratchet device 96 has a rotation shaft 100.
The rotating shaft 100 has a retaining pawl 98 pivotably attached to the rotating shaft 100 and is supported by another guide block 102 fixed to the front surface 104 of the frame 12. This second guide block 102 likewise has a slot 106 through which a screw 108 passes to secure the guide block 102 to the front face 104 of the frame. By loosening the screw 108, the guide block 102 or pawl 98 can be adjusted in position. Detent pawl 9 is secured by a small compression spring 110 housed in guide block 102.
8 is pressed clockwise. End 1 of retaining pawl 98
12 engages with the notch portion 94 to prevent the chain pin SS from returning together and toward the supply coil 65 when the block 38 and the feed pawl 80 are moving away from the board. ing.

To describe the timing of the machine, which is adjusted in advance by the eccentric cam 46, the feed claw 8 is moved toward the board.
0 moves the chain pin the length of one terminal pin, the shear plunger 60 is actuated to the left as shown in FIG. The terminal pin LP is separated from the remaining chained pin SS by . During shearing operation, the terminal pin LP is as shown in Figure 4.
It is displaced laterally to the left and placed under the holding shoulder 116, after which the pin is driven into the board. During movement toward the board, the terminal pin LP is held in position under the retaining shoulder 116 by a spring-loaded plunger 118 supported on the block 38 below the cutter plunger 60.

As can be seen from the above, there must be certain spatial relationships between the various elements. For example, the distance between the end 92 of the feed pawl 80 and the cutting edge of the shearing blade 114 must be equal to or an integral multiple of the exact length of one of the terminal pins 64. Only with this arrangement is the shearing blade capable of shearing the terminal pin LP from the chain pin SS at the notch 94 of the chain pin. This ensures that the ultimately inserted pin has tapered ends at both ends, which is very advantageous when used in the wire wrap method. At the same time, since the notch 94 is sheared at the midpoint, a pointed portion is formed on the terminal pin, eliminating the possibility of undesirable burrs remaining.

Note that when using chain pins formed to obtain terminal pins of different lengths, the position of the guide block 84 is adjusted so that the end 92 of the feed pawl 80 and the shearing blade 114 of the shearing plunger 60 are aligned. It is only necessary to make the distance between the tip and the cutting edge equal to or an integral multiple of the length of one terminal pin 64. Similarly, when the length of the terminal pin 64 is different, by adjusting the position of the guide block 102 and changing the distance from the guide block 84, the end 1
12 and the end 92 of the feed pawl 80 is equal to or an integral multiple of the length of the terminal pin 64.

The present invention has been described above with some specificity, but
This description is exemplary only, and those skilled in the art will recognize that many other embodiments may be made without departing from the spirit and scope of the invention as claimed.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of a device according to the invention;
FIG. 2 is a partially sectional front view showing the reciprocating feed mechanism engaged with the chain pin; FIG. 3 is a front view similar to FIG. 2 showing the reciprocating feed mechanism approaching the substrate; FIG. 4 is a partially sectional side view of the mechanism shown in FIG. 3, FIG. 5 is a front view of a terminal pin implanted by the device of the present invention, and FIG. 6 is a front view of another embodiment of the terminal pin. 7 are cross-sectional views of terminal pins made according to still another embodiment. 12... Frame, 14... Motor, 20... V-belt, 24... Clutch, 30, 34... Pin, 3
6...Sliding member, 40...Reciprocating feed mechanism, 42
... Shearing mechanism, 44 ... Holding mechanism, 46 ... Eccentric cam, 58 ... Cutting action plunger, 60 ...
...Shear plunger, 64...Terminal pin, 68...
...Tapered end, 80... Feed claw, 84, 102...
Guide block, 94...notch portion, 118...spring pressing plunger.

Claims (1)

[Claims] 1. A notch is formed at a location corresponding to the length of the terminal pin to prevent burrs from appearing when sheared,
The chain pins are sequentially advanced toward the board by having a feeding claw that engages with the notch portions of the chain pins that are continuous in the length direction, and the terminal pins sheared at the notch portions are inserted into the openings of the board. In an apparatus for inserting a terminal pin into a board, the shearing mechanism is equipped with a reciprocating feeding mechanism, and a shearing mechanism that shears one terminal pin from the chain pins at the notch portion. The cutting edge of the shearing blade 114 of the shearing mechanism is set at a certain distance from the feed claw, and the certain distance is set at a certain distance from the feeding claw.
The device is an integral multiple of the length of a real terminal pin 64, and further characterized in that the reciprocating feed mechanism 40 has a pin holding mechanism 44 for press-fitting the sheared terminal pin. 2. The feed pawl 80 is rotatably pivotally mounted, and the end portion 92 is pressed to engage the notch portion of the chain pin SS, so that when the reciprocating feed mechanism 40 moves in the direction away from the substrate, Claim 1, characterized in that the feed pawl 80 rotates slightly in a direction opposite to the direction in which it engages the notch portion, and the end portion 92 slides on the chain pin SS. The device described in. 3 Adjust the position of the feeding claw 80 to the shearing mechanism 42
Claims 1 or 2, characterized in that the device is capable of accepting chain pins of different lengths by providing an adjustment mechanism for the cutting edge of the shearing blade 114. equipment. 4 The terminal pin 64 sheared by the shearing mechanism 42 is displaced to be held by the holding mechanism, and the shearing mechanism 42
furthermore, when the plunger 60 moves in the opposite direction to the shearing direction, the spring pressing plunger 118 moves the terminal pin 6 after shearing.
4. The apparatus according to any one of claims 1 to 3, characterized in that the holding mechanism 44 holds the holding mechanism 44.