JPS5828056B2 - Lead wire cutting/bending method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for cutting a lead wire of an electronic component inserted into a lead wire insertion hole of a printed circuit board into a predetermined length, bending it along the back surface of the printed circuit board, and fixing the lead wire. It is something.

Various techniques have been known to perform such lead wire cutting and bending work, but one type of technology is a stationary blade that is stationary near a predetermined position on the back side of a printed circuit board, and a technique that works with this stationary blade. Some devices use a movable blade that works to shear the lead wire and also bend the lead wire.

After the movable blade is moved forward to shear the lead wire between it and the stationary blade, the lead wire is bent by moving it further forward, and the work of cutting and bending the lead wire is done all at once by a device with a simple structure. It is often used to obtain

However, with conventional cutting and bending devices of this type, the shearing direction and bending direction of the lead wire are always the same in principle.
This has caused the following inconveniences in actual use.

In other words, when two lead wires of an electronic component are cut and bent at once using one stationary blade and one movable blade, the two bent parts are both on the plane determined by the two lead wires. Moreover, since the thickness of the printed circuit board is generally thin, the electronic components may fall over during handling before the soldering process (rotate approximately 90 degrees relative to the printed circuit board), and lead wires may be damaged. It is easy to cause a situation in which the product comes off from the printed circuit board.

If there are two stationary blades and two moving blades, and each set of stationary blades and moving blades are arranged opposite to each other, each lead wire can be cut and bent. The curved portion can be bent inwardly (rarely outwardly toward each other) within a plane determined by the two lead wires, thereby preventing the lead wires from coming off as described above. However, in this case, the distance between the two stationary blades and the movable blade is set to various pitches of the lead wire insertion holes (for example, 1.5, 2.0, 2.5).

5.0, 6. Various things such as Qmm are standardized.

), it is necessary to change it according to the target 1, 1-
Each time the pitch of the wire insertion hole changes, it becomes necessary to replace the stationary blade and the movable blade or adjust the interval.

The present invention was made with the aim of eliminating such drawbacks of the prior art, and its gist is to divide a movable blade into a plurality of small cutting blades by a dividing plane perpendicular to the cutting edge. Initially, these small cutting blades were cut simultaneously and in the same direction perpendicular to the straight line connecting the two lead wires to be cut when viewed from the direction perpendicular to the back side of the printed circuit board, as if they were one piece. Move it forward like a blade,
Simultaneously shears two lead wires between the stationary blade and
After that, while further advancing these small cutting blades, the distance between the small cutting blade that sheared one of the two lead wires and the small cutting blade that sheared the other lead wire is expanded or reduced. The point is to bend the printed circuit board so that it forms a V-shape when viewed from the direction perpendicular to the back side.

By doing this, the bent parts of the two lead wires will no longer be parallel to each other, so there will be no risk of the lead wires coming off the printed circuit board during handling before the soldering process.
Furthermore, it is possible to accommodate various lead wire insertion hole pitches without having to replace stationary blades, movable blades, etc. or adjust the intervals.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in more detail based on the drawings.

In FIG. 1, reference numeral 1 denotes a stationary blade, and the stationary blade 1 is fixed to the tip of a cutting blade holding bar 2 by bolting or other means.

The first cutting tool consisting of the stationary blade 1 and the cutting blade holding bar 2 is held by a guide block 4 fixed to the main body 3 of the device so as to be slidable in a direction inclined upward to the right.
It is moved (advanced and retracted) in the longitudinal direction by a first forward-backward movement device (not shown) via a lever 6 that is pivotally supported on a support shaft 5 fixed to the main body 3 of the device.

That is, a stationary blade means a cutting blade that performs a lead wire shearing action while stationary, and does not necessarily mean a completely fixed cutting blade.

As is clear from FIGS. 2 and 3, the movable blade that cooperates with the stationary blade 1 to shear the lead wire is ? L, 7C,
It is divided into three small cutting blades denoted by 7R, each having cutting blade holding bars 8L and 8C.

8R tip (fixed by conventional means such as bolt tightening).

These cutting blade holding bars 8L and 8C. 8R passes through a guide block 11 fixed to the main body 3 of the apparatus in an upwardly left-hand direction, and its distal end is pivotally attached to one movable member 9 to constitute a second measuring tool.

As shown in FIG. 2, the moving member 9 consists of a square column part 9a, a base part 9b, and a yoke part 9C, and the square column part 9a is slidably fitted into the guide hole 11b of the guide block 11. The yoke part 9c is connected to the lever 12, and the lever 12 is moved to the support shaft 13 by a second forward/backward movement device (not shown).
It is a member that is moved forward and backward in the longitudinal direction when rotated around the cutting blade holding bar 8L at its base 9b.
, 8C, 8R are pins 14L, 14C.

It is pivotally connected by 14R.

Moreover, the guide hole 11b provided in the guide block 11
As shown in Fig. 3, the cutting blade holding bar 8L has three widths.
, 8C, 8R.

8R can rotate slightly around the pins 14L, 14C, and 14R.

The guide block 11 is further provided with another guide hole 11c, and a substantially square columnar actuating rod 15 is slidably fitted into this guide hole 11c.

The operating rod 15 has a yoke portion 15a at its end connected to a lever 16, and is a member that is moved forward and backward in the longitudinal direction by a third advance/retreat actuator (not shown) via the lever 16. One end of the links 17, 18 of is pivotally connected by a pin 19.

The other ends of the links 17 and 18 are each a cutting blade holding bar 8L,
It is pivotally mounted near the tip (free end) of 8R by pins 21 and 22.

Three bottomed holes 8a, 8b are bored in the surfaces of the cutting blade holding bars 8L, 8R facing the same 8C. are slid together airtight to form an air cylinder.

The bottomed holes 8a and sb are connected to the passages 8c and 8d and the conduits 25 and 2.
6 is connected to a solenoid valve 27, and compressed air is selectively supplied from an air source 28 by switching the solenoid valve 27.

As shown in an enlarged view in FIG. 5, the stationary blade 1 described above is provided with a notch 1a on the lower surface of its tip, and the tip edge of the notch 1a is used as a cutting edge 1b.

In addition, small cutting blades 7L are provided on the hanging portions 1c on both sides of the notch 1a.
, '7 Inclined surface 1b to facilitate engagement with R
is formed.

On the other hand, a small cutting blade? As shown enlarged in FIG. 5, L, 7C, and 7R have surfaces 7a, 7b, and 7c parallel to the back surface pb of the printed circuit board P at their tips, and these planes are shown in FIG. V grooves A and B at the positions shown in .

Are C, D, E, F, G, H, J, and K small cutting edges? L.

It is carved in a direction perpendicular to the cutting edge of 7C and 7H.

In other words, 1.5 mm from the ■groove A carved on the small cutting edge 7L.
, 2.0 , 2.5 , 5.0 , 6.01117It
V-grooves C2D, B, J, and K are formed at the positions of 1.5, 2.0, 2.5, and 1.5, 2.0, 2.5,
V grooves H, G, F, B, A at 5.0 and 6.0 mm positions
are carved in accordance with the standard pitch of the lead wire insertion hole of the printed circuit board, and as a result, the small cutting edge 7
L, 7C.

The same number of ■-shaped notches are formed on the cutting edge of 7R.

The reason why the grooves are carved in two ways based on the small cutter blades 7L and 7R is because of the mechanism for inserting electronic components into the printed circuit board. This is to deal with being inserted.

Next, the operation will be explained.

As shown in FIG. 1, after the printed circuit board P is positioned at a predetermined position by a positioning device (not shown) and the lead wire of the electronic component W is inserted into the lead wire insertion hole Pa of the printed circuit board P, the cam is The lever 6 is rotated by a first advancing/retracting actuator (not shown), and the stationary blade 1 is advanced toward the back surface Pb of the printed circuit board P and positioned at a predetermined position.

Subsequently, the second and third advancing/retracting actuators including cams are operated simultaneously to rotate the levers 12 and 16, respectively.

As a result, the movable member 9 and the actuating rod 15 move forward together, and their distal ends are pivotally connected to the movable member 9, and their distal ends are connected to the links 17, 17.
Cutting blade holding bars 8L, 8 connected to the operating rod 15 by
C.

8R moves forward simultaneously and in the same direction.

In other words, when viewed from the direction perpendicular to the back surface of the printed circuit board P, cut in the direction perpendicular to the straight line connecting the two lead wires to be cut (the straight line perpendicular to the plane of the paper in Figure 1). Move forward.

Therefore, the cutting blade holding bar is 8L. Small cutting blade fixed to the tip of 8C, 8R? L, 7C.

7R approaches the back surface pb of the printed circuit board P from an oblique direction as if it were an integrated cutting blade, and shears the lead wire between it and the stationary blade 1 that is already stationary at a predetermined position. do.

Small cutting blade? Even after shearing the lead wires, L, 7C, and 7R
It enters the triangular gap formed between the printed circuit board P and the stationary blade 1 as shown in FIG. 5, and has the effect of bending the lead wire along the back surface Pb of the printed circuit board P. Since the actuating rod 15 is advanced at a higher speed than the moving member 9 by the third advance/retract actuator, the pin 21.2
2, the pin 19 advances relative to 2, the interval between the pins 21 and 22 is expanded, and the cutting blade holding bars 8L, 8
R are respectively rotated by the same angle in opposite directions around the pins 14L and 14R.

Now, if the pitch of the two lead wires is 5.0 mm and they are inserted to the left, the lead wire will be ■
It will be sheared at the same position J as the groove A, but in this case, the solenoid valve 27 has been switched in advance to the direction of supplying compressed air to the pipe line 25, so the cutting blade holding bar 8C is cut off by the piston 23. is pressed toward the cutting blade holding bar 8R side by
Therefore, when the cutting blade holding bars 8T, 8R rotate in opposite directions, the cutting blade holding bar 8C rotates in the same direction as the cutting blade holding bar 8R.

That is, the space between the cutting blade holding bars 8L and 8C is widened.

As a result, the small side blades 7C and 7R move to the right, and the small cutting blade 7L
moves to the left, the distance between ■Groove A and ■Groove J is expanded, and the lead wires guided by ■Groove A and V-Groove J are moved in the shear direction as shown in Figure 6. It is then bent in the direction of the angle θ, forming a V-shape.

Also, is this angle θ a small cutting edge? L, 7C,? It can be arbitrarily determined by changing the ratio between the forward speed of R and the expansion speed (moving speed in the direction perpendicular to the forward direction).

In addition, if the lead wire pitch is 1.5 mm and it is inserted to the right, the lead wire will be sheared at the V-groove H and V-groove positions, but in this case, Since the solenoid valve 27 is switched in advance to supply compressed air to the conduit 26, the space between the small cutting edge 7C and the small cutting edge 7R is widened, and the lead wire is also connected to the sixth Folded in the direction shown in the figure.

After the lead wire bending process is completed, the levers 6, 12, 16, cutting blade holding bar 2, movable member 9, operating rod 15, etc. are returned to their original positions by a return spring (not shown), and the stationary blade 1, small cutting blade ? L.

7C and 7R are separated from the back surface Pb of the printed circuit board P and -
Cycle operation is complete.

Although the embodiment described in detail above is one of the particularly preferred embodiments of the present invention, the present invention is not limited to the above embodiment, and various modifications are possible.

For example, the V grooves A, . It is also possible to carve at a certain angle with respect to the cutting edge as shown in Fig.
Even when bent almost parallel to

Furthermore, if the width of the small cutting blade is sufficiently wide, or if the angle θ between the bending direction of the lead wire and the shearing direction is relatively small, the strawberry such as v is not necessarily essential.

Further, the expansion mechanism for expanding the cutting blade holding bars 8L, 8C, and 8R is also the same as the operating rod 15 and the link 17 in the above embodiment.
18, etc., pistons 23, 24, and electromagnetic valve 27, etc.; for example, the object can be similarly achieved by the combination shown in FIG.

In the one shown in FIG. 8, cutting blade holding bars 8L, 8C, and 8R pass through guide holes 11b of guide block 11, and the end portions are connected to pins 14L.

It is pivotally connected to the moving member 9 by 14C and 14R,
It is the same as the previous embodiment in that it can be moved in the longitudinal direction together with the movable member 9, but there is no operating rod 15 and the cutting blade holding bars 8L, 8C, 8R are expanded by utilizing their forward movement. They differ in that they provide motion.

A tension spring 31 is tensioned between the tips of the cutting blade holding bars 8L and 8R to constantly bias them in the closing direction, and the cutting blade holding bars 8L, 8C, and By selectively fitting the wedges 34 and 35 into either one of the through holes 32 and 33 formed between the cutting blade holding bars 8C and 8R from the back side, the cutting blade holding bar The moving direction of 8L, 8C, and 8R is restricted.

The rollers 36L, 36C, and 36R pivotally attached to the upper necks of the cutting blade holding bars 8L, 8C, and 8R are
Move forward with L, 8C, and 8R and enter through hole 32 or 33.
When it comes into contact with the wedge body 34 or 35 that penetrates and projects upward, the area between the cutting blade holding bars 8L and 8C or between the cutting blade holding bars 8C and 8R is selectively expanded, and the small cutting edge 7
L, 7C.

7R is given the same motion as in the previous embodiment.

In order to selectively operate the wedge bodies 34, 35, a combination of an air cylinder and a solenoid valve, a combination of a spring and an electromagnet, etc. can be suitably used.

Also, if the pitch of the lead wire to be cut is one type,
Or, if the pitch changes in multiple types, but all of them are arranged in a distributed manner with respect to a single center line, it is sufficient to divide the movable blade into two parts, and the cutting blade holding bar 8
C, the pistons 23 and 24, the wedge bodies 34 and 35, etc. can be omitted, and the expansion mechanism becomes extremely simple.

Furthermore, if the pitch of the lead wires is wide, by moving the small cutting blades forward and bringing them closer together, it is also possible to bend the lead wires inward to form a V-shape as shown in Figure 9. This is also one of the embodiments of the present invention.

Furthermore, the movement of the cutting blade holding bar for moving the small cutting blades toward or away from each other is preferably a rotational movement in order to simplify the structure of the device, but it is also possible to use a parallel movement. It is desirable that the moving direction of the movable blade during wire bending be in a direction inclined with respect to the board surface of the printed circuit board as in each of the above embodiments in order to ensure the bending process of the lead wire. It is also possible to move it in a direction parallel to Ura-shiro.

An example thereof is shown in FIGS. 10 and 11.

In the figure, 41 is a stationary blade, which is fixed to an elevating member 43 that is moved up and down by an air cylinder 42.

Further, 44L and 44R are small cutting blades (moving blades), and rotating arms 47L and 47 are pivotally connected to moving members 46L and 46H that are moved left and right by air cylinders 45L and 45R.
It is fixed to the tip of R.

In this embodiment, the cutting blades 44L and 44R are rotary arms 47.
When L and 47R are rotated by air cylinders 48L and 48R, the lead wires are sheared in a direction substantially parallel to the back surface PI of printed circuit board P.

Even after shearing the lead wire, the small cutting blade is 44L. 44R further moves almost parallel to the back surface pb of the printed circuit board P and bends the lead wire, but at the same time, the moving member 46
Since L and 46R are separated from each other by the air cylinders 45L and 45R, the small cutting blades 44L and 44R are also separated from each other, and the lead wire is inclined outward at a constant angle with respect to the shearing direction. It will be bent.

In this case as well, the small cutting blade is 44L. 44R's slanted tip surface is provided with a groove, etc., or a material with a high friction coefficient is fixed to it so that the lead wire cannot easily slide on the tip surface of the small cutting blades 44L and 44R. It is effective to ensure that the bending direction of the lead wire is inclined with respect to the shearing direction.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view (I-1 sectional view in FIG. 2) showing one embodiment of the present invention. FIGS. 2 and 3 are n-ff in FIG.
A cross-sectional view and a river-]II cross-sectional view. FIG. 4 is an enlarged view of the ■ part in FIG. 3. FIG. 5 is an explanatory diagram showing the situation immediately before the lead wire is sheared by the apparatus shown in FIG. 1. FIG. 6 is an explanatory diagram showing the state of the lead wire folded by the apparatus shown in FIG. 1. FIG. 7 is a diagram corresponding to FIG. 4 in another embodiment of the present invention. Country 8 is a diagram corresponding to FIG. 3 showing still another embodiment of the present invention. FIG. 9 is an explanatory diagram showing how lead wires are bent in still another embodiment IZlj of the present invention. Country 10 is a side view showing still another embodiment of the present invention, and FIG. 11 is also a ↑F side view. 1: Stationary blade, 2: Cutting blade holding bar, 3: Device main body, 4 guide blocks, 5: Support shaft, 6: Lever, ? L, 7C,
7R: Small cutting blade (moving blade), 8L. 8C: 8R: Cutting blade holding bar, 9: Moving member, 11 Ni guide block, 12 Ni lever 13 = Support shaft, 15: Operating rod 1.16: Lever, 17, 18: Link, 23, 24:
Piston, 32, 33: Through hole, 34° 35: Wedge body,
36L, 36C, 36R: Roller, 41: Stationary blade, 44
L, 44R: Small cutting blade (moving blade).

Claims (1)

[Claims] 1. A method in which two lead wires of an electronic component inserted into a lead wire insertion hole of a printed circuit board, the portions protruding from the back surface of the printed circuit board are cut to a predetermined length and bent, at least two mutually independent movable blades at the same time, and
Move forward in the same direction perpendicular to the straight line connecting the two lead wires when viewed from a direction perpendicular to the back surface of the printed circuit board, and move any two of the moving blades to the vicinity of the back surface of the printed circuit board. a step of shearing each of the lead wires to a predetermined length with a stationary blade stationary at a predetermined position; and a step of moving each of the movable blades further forward after the shearing step is completed. while moving at least the two movable blades that have sheared the lead wire by the same distance in a direction substantially perpendicular to the direction of the forward motion, thereby expanding or reducing the distance between the two movable blades. , a step of bending the two lead wires cut to a predetermined length in the shearing step so that they form a V-shape when viewed from a direction perpendicular to the back surface of the printed circuit board. How to cut and bend wire. 2. The forward movement of the movable blade is a movement of approaching the back surface of the printed circuit board from a direction inclined with respect to the back surface of the printed circuit board, and the movable blade continues to move even after the lead wire is sheared to a predetermined length. 2. A method as claimed in claim 1, in which the movement further moves in a direction perpendicular to the direction of the approaching movement while approaching the back side of the printed circuit board. 3 A device that cuts and bends the part of the lead wire of an electronic component inserted into the lead wire insertion hole of the printed circuit board that protrudes from the back surface of the printed circuit board to a predetermined length, and at least during the cutting operation, close to the back surface of the printed circuit board. a first cutting tool having one cutting blade that is held stationary at a predetermined position; and a cutting blade that is to shear the two lead wires in cooperation with the cutting blade of the second cutting tool is approximately at a position relative to the cutting edge. It is constituted by an assembly of small cutting blades divided into a plurality of pieces on a perpendicular plane, and each of the small cutting blades is arranged approximately parallel to one movable member and independently within the rotor plane. a second cutting tool fixed to the free ends of a plurality of cutting blade holding bars pivotally connected to be able to rotate by a small angle; a holding member that is inclined at a predetermined angle with respect to the cutting blade holding bar and holds the cutting blade holding bar in a state in which it can move forward and backward in the longitudinal direction; a forward-backward movement device that gives forward and backward movement to the movable member of the second cutting tool; A cutting blade holding bar located on one side of the gap formed between the plurality of cutting blade holding bars and a cutting blade holding bar located on the other side of the gap formed between the plurality of cutting blade holding bars. The cutting blade holding bar is rotated in opposite directions and by approximately the same angle, and the distance between one group of small cutting blades fixed to the tip of the cutting blade holding bar and the other group is adjusted according to the forward and backward movement. 1. A lead wire cutting/bending device comprising: an expanding mechanism that expands the lead wire in a direction substantially perpendicular to the lead wire. 4. The expansion mechanism includes an operating rod that is moved forward and backward in a direction parallel to the direction of forward and backward movement of the movable member by a second forward and backward movement device that operates in conjunction with the forward and backward movement device; two links which are pivotally connected to the rod and whose other ends are pivotally connected near the respective free ends of the two outermost cutting blade holding bars; an air cylinder that is disposed between two adjacent cutting blade holding bars and operates in a direction to separate adjacent cutting blade holding bars from each other; an air supply device that supplies air, when the two links expand the two outermost cutting blade holding bars based on the relative movement of the operating rod with respect to the cutting blade holding bar; Claim 3, wherein the air cylinder is configured to selectively rotate a cutting blade holding bar other than the two cutting blade holding bars together with either of the two cutting blade holding bars. The equipment described in section.