JPH0139680B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for mounting lead wires on a printed circuit board.

[Background technology]

Conventionally, the method of mounting lead wires on printed circuit boards used a single-head lead wire insertion device, which made it impossible to adjust the length of the lead wires to be mounted, making it difficult to change the length. had to replace the head.

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a lead wire mounting method that allows lead wires of arbitrary length to be mounted on a printed circuit board.

[Disclosure of the invention]

The inventors have made extensive studies to achieve the above objectives. As a result, two heads for inserting the lead wires were fixed in front of the opening of the lead wire supply unit, and after one head inserted the starting end of the lead wires onto the printed circuit board, the lead wires were inserted while moving the board. If the wire is fed and moved to the lead termination insertion point, then the other head inserts the lead termination onto the board.
It has been discovered that the above-mentioned drawbacks can be overcome and good results can be obtained, and the present invention has now been completed.

Therefore, the present invention provides a lead wire mounting method in which a lead wire pulled out from a lead wire supply unit is chucked by a head, subjected to strip forming, and then inserted into a printed circuit board. Two heads are fixed in front of the opening of the lead wire supply unit, one of which inserts the starting end of the lead wire into the printed circuit board, and the other which inserts the terminal end of the lead wire into the printed circuit board. A lead wire mounting method characterized in that the starting end insertion point and the ending end insertion point of the lead wire on the board are brought to a position of an opening of a lead wire supply unit by moving the board. This is the summary. Hereinafter, this will be explained in detail based on drawings showing examples thereof.

FIG. 1 is a diagram illustrating an embodiment of a device used in the lead wire mounting method according to the present invention, and FIG.
The figure is a partially cutaway sectional view showing the head that makes up the device shown in FIG. 1, and FIG. 3 is a sectional view showing the tip of the head and the tip of the lead wire supply unit that make up the device shown in FIG. . As shown in FIG. 1, a printed circuit board 1 is placed on an X-Y table 2 that allows movement in all directions on a plane. Above the printed circuit board 1, there are two heads 4a and 4b for inserting lead wires into the circuit board 1.
They are positioned so that their respective tips are directed toward the substrate 1. Lead wires 3 coming from a lead wire supply unit (not shown) are fed into the tips of these heads 4a, 4b. These heads 4a, 4b move downward, and their tips insert the ends of the lead wires 3 into the substrate 1. The lead wire supply unit (not shown) is equipped with a drive means 12 such as a feed roll, and is configured to send out the lead wire 3 by the rotational force of the drive means 12. As shown in FIG. 2, the tip of the head 4 has an extension piece 5 that extends downward in an inverted L shape, and above the tip protrusion 6 of the extension piece 5.
Round notch 8 at the tip to accept the lead wire
It has a rectangular piece 7 having a shape. In the figure, reference numeral 9 denotes a blade adjacent to the rectangular piece for cutting off the coating of the lead wire (not shown). As shown in FIG. 3, the blade adjacent to this rectangular piece has a recess 10 extending upward from the tip on the surface in contact with the rectangular piece 7, and one side and the lower surface of the recess 10 are open. This depression 10 is
The blade 9 is provided to cut off only the coating of the lead wire 3 and to prevent the inner wire from being cut as well. The rectangular pieces 7, 7 of the two heads 4a, 4b face each other on the inside between the two heads 4a, 4b, and the blades 9, 9 are located on the outside between the two heads 4a, 4b. These rectangular pieces 7, 7 and blades 9, 9 are adapted to move downward independently. The supply unit 11 for feeding out the lead wire has a lead wire cutting blade 13 at the lower part of its tip. The lead wire cutting blade 13 cuts the lead wire 3 in such a way as to cut off the opening of the lead wire supply unit 11 while rising upward.

Next, the operation of inserting the lead wire into the printed circuit board will be explained based on FIGS. 4 to 11. As shown in FIG. 4, when the lead wire 3 is sent out from the lead wire supply unit 11 to the first head 4a located far away from the lead wire supply unit 11, the first head 4a
The rectangular piece 7 moves downward and catches the lead wire between a notch (not shown) at its tip and the tip protrusion 6 of the inverted L-shaped extension piece. In the diagram, 4
b represents the second head. Next, as shown in FIG. 5, the blade 9 of the first head 4a descends and strips off the coating of the lead wire 3 (strip forming), forming an inverted L-shape in the recess 10 of the blade 9. The bare wire of the lead wire 3 is sandwiched between the protrusion piece and the side surface of the tip protrusion part 6. As shown in Figure 6, the first
The head 4a descends onto the printed circuit board 1 while holding the bare wire of the lead wire 3. Then, the bare wire of the lead wire 3 held by the first head 4a is inserted into the starting end insertion hole 14 of the printed circuit board 1. first head 4
When the wire a descends downward, the lead wire 3 is fed out from the lead wire supply unit 11 at the same time. The starting end of the lead wire 3 inserted into the insertion hole 14 of the substrate 1 is clinched as shown in FIG. As shown in FIG. 8, the board 1 moves with the starting end of the lead wire 3 clinched, and the terminal end of the lead wire 3 is inserted directly under the second head 4b near the lead wire supply unit 11. Hole 15
position. Next, as shown in FIG. 9, the second head 4b connects the lead wire 3 between the notch (not shown) at the lower end of the rectangular piece 7 and the tip protrusion 6 of the inverted L-shaped extension piece. to catch (chatsuku).
Then, the lead wire cutting blade 13 located above the opening of the lead wire supply unit 11 cuts the lead wire 3 from the opening.
cut. The cut end of the lead wire 3 is connected to the second head 4 as shown in FIG.
The coating is removed by the blade 9 of b (strip forming), and the blade 9 is removed in the recess 10 of the blade 9.
and the side surface of the tip protrusion 6 of the inverted L-shaped extension piece. The terminal end of the sandwiched lead wire 3 is connected to the 11th
As shown in the figure, it is inserted into the insertion hole 15 on the printed circuit board 1 directly below it. In this way, the lead wires are mounted on the printed circuit board.

In addition, in the embodiment, the method of checking the lead wire was to insert it between the protrusion at the tip of the inverted L-shaped extension piece and the round notch at the tip of the rectangular piece. There is no particular restriction on the shape of the cut, and there is no need to provide a cut.

In the embodiment, rotation of the drive roll is used as a method for sending out the lead wire, but the method is not limited to this.

FIG. 12 is a diagram showing an NC control mechanism used in another embodiment of the lead wire mounting method according to the present invention. In the above-mentioned embodiment, when the lead wire moves from the starting end insertion point to the end insertion point on the board by following the shortest straight path, there is not much margin in the length of the lead wire.
The lead wire was easily strained. Therefore, in this embodiment, the X-Y table for moving the printed circuit board and the lead wire supply unit are operated using NC control so that the lead wires are sent out with sufficient margin. That is, in the NC control mechanism used in this embodiment, as shown in FIG. 12, when the lead wire insertion position on the board is input to the data input section, the input data is
It is sent to the trajectory calculation section. The NC locus calculation section calculates the locus to be drawn at each point on the substrate directly below the opening position P of the lead wire supply unit based on the data. From the determined trajectory, the path of movement of the printed circuit board and the length of the lead wire to be used are further determined. The set command value regarding the movement path of the printed circuit board is sent to the X-Y axis NC unit that controls the movement of the X-Y table, and the command value regarding the lead wire length controls the drive motor of the lead wire supply unit. It is sent to the lead wire supply NC section. In this way, based on the command values sent to the X-Y axis NC section and the lead wire supply NC section,
The drive motors of the table and lead wire supply unit each drive the table and the lead wire supply unit.

Next, the calculation method performed in the NC trajectory calculation section regarding the trajectory drawn by each point on the substrate directly below the opening position P of the lead wire supply unit and the operations based thereon will be explained. As shown in Figure 13,
The starting end of the lead wire is placed on the substrate directly below the opening position P of the lead wire supply unit, with reference to the line segment l passing directly under the opening position P of the lead wire supply unit and perpendicular to the lead wire discharge direction h of the lead wire supply unit. (insertion point a). If the point on the board where the end of the lead wire is to be inserted is point b below line segment l, an arc ab whose center is the intersection m of the perpendicular bisector of straight line ab and line segment l. Find ⌒. X
- The operation of the Y table is such that each point on the board directly below the opening position P of the lead wire supply unit is an arc ab⌒
All you have to do is perform circular interpolation in the direction of the arrow so that If the point where the end of the lead wire is to be inserted is point c above line segment l, the point between c', which is perpendicular to line segment l from c, and point a where the start end of the lead wire is inserted is Find a semicircle ac⌒' centered at point n. Based on the semicircle ac⌒′ and line segment c′c obtained in this way,
-The Y table may be interpolated in the direction of the arrow. At this time, each point on the board directly below the opening position P of the lead wire supply unit first draws a semicircle ac⌒',
Next, draw a straight line c′c.

FIGS. 14 and 15 are diagrams showing another aspect of the calculation method regarding the trajectory drawn by each point on the substrate directly below the opening position P of the lead wire supply unit. FIG. 14 shows a case where passing points on the trajectory are specified. The starting end of the lead wire is placed on the substrate directly below the opening position P of the lead wire supply unit, based on a line segment l that passes directly under the opening position P of the lead wire supply unit and is perpendicular to the lead wire discharge direction h of the lead wire supply unit. (insertion point a). First, a passing point a′ of the trajectory to be drawn is set. This results in
Point f where the end of the lead wire should be inserted on the board and the passing point
The line segment a′f between a′ and a′ is found. Furthermore, the starting end insertion point a of the lead wire is centered on one point on the line segment l.
Calculate the circle that passes through both points and passing point a′, and calculate the arc
Find a′a⌒. In operation of the X-Y table, each point on the board directly below the opening position P of the lead wire supply unit initially draws an arc aa⌒', then a straight line a'f
All you have to do is interpolate to draw . FIG. 15 shows a case where the radius of the circular arc serving as the locus is specified. The starting end of the lead wire is placed on the substrate directly below the opening position P of the lead wire supply unit, based on a line segment l that passes directly under the opening position P of the lead wire supply unit and is perpendicular to the lead wire discharge direction h of the lead wire supply unit. (insertion point a). First, the radius r of the arc that constitutes the trajectory to be drawn is set. Then, a circle having a radius r that is centered on a point on the line segment l and passes through the starting end insertion point a of the lead wire is calculated. As a result, a tangent line ga'' that touches the circle of radius r from the point g where the end of the lead wire should be inserted on the board is found.Furthermore, from the point of contact a'' on the calculated circle to the insertion point a of the starting end of the lead wire, a The arc a″a⌒ up to
Next, interpolate to draw a straight line a″g.

The calculation method for the locus drawn by each point on the board directly below the opening position P of the lead wire supply unit is as follows.
In this embodiment, the method of determining the circular arc is used, but the method is not limited to this.At least initially, when the lead wire starting end insertion point a on the board is directly below the opening position P of the lead wire supply unit, the It is sufficient to find a trajectory that deviates from the straight line connecting the starting and ending insertion points of the line.

〔Effect of the invention〕

As described above, the lead wire mounting method according to the present invention is such that two heads for inserting the lead wire are provided and fixed in front of the opening of the lead wire supply unit, and one head is used to insert the starting end of the lead wire. After that, while moving the printed circuit board, the lead wire is supplied and moved to the lead wire termination insertion point, and the other head inserts the end of the lead wire onto the circuit board, so any length can be achieved. This allows the lead wires to be mounted on the board. In addition, the
If control is performed and the supply path of the lead wire is made into an arcuate path, the lead wire is sent out with a sag, so that the terminal end of the lead wire can be inserted onto the substrate with a margin. Furthermore, when calculating the locus drawn by each point on the board that comes directly under the opening position P of the lead wire supply unit, which is the lead wire supply route, we also calculate the radius of one passing point on the locus and the radius of circular interpolation. If you use a calculation method that arbitrarily specifies It can be inserted onto the board over a short distance and in a short time. Furthermore, even if discrete components are mounted on the board, the intermediate route of the lead wire can be specified so as to avoid such components.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating an embodiment of a device used in the lead wire mounting method according to the present invention, and FIG.
The figure is a partially cutaway partial sectional view showing the head constituting the device shown in FIG. 1, FIG. 3 is a partial sectional view showing the device shown in FIG. 1, and FIGS. 4 to 11 are according to the present invention. FIG. 12 is a partial sectional view illustrating an embodiment of the lead wire mounting method; FIG. 12 is a diagram illustrating an NC control mechanism used in another embodiment of the lead wire mounting method according to the present invention;
14 and 15 are diagrams for explaining a lead wire supply route calculation method using the NC control mechanism of FIG. 12. 1...Printed circuit board, 2...X-Y table,
3... Lead wire, 4, 4a, 4b... Head, 1
1...Lead wire supply unit, a... Lead wire starting end insertion point on the board, b, c, f, g...
The terminal insertion point of the lead wire on the board.

Claims (1)

[Scope of Claims] 1. A lead wire mounting method in which a lead wire pulled out from a lead wire supply unit is chucked by a head, subjected to strip forming, and inserted into a printed circuit board, comprising: Two heads are fixed in front of the opening of the lead wire supply unit, one of which inserts the starting end of the lead wire into the printed circuit board, and the other which inserts the terminal end of the lead wire into the printed circuit board. 1. A method for mounting lead wires, the method comprising: moving the lead wires so that the starting and ending insertion points of the lead wires on the board are located at the opening of the lead wire supply unit. 2. The lead wire mounting method according to claim 1, wherein the length of the lead wire drawn out from the lead wire supply unit and the movement of the printed circuit board are instructed by NC control. 3. The starting end insertion point of the lead wire on the board is away from directly below the opening position P of the lead wire supply unit,
The movement of the board for the point where the end of the lead wire is to be inserted to approach directly below the position P is such that the locus drawn by each point on the board that comes directly below the position P is such that at least initially, the starting end insertion point is at the position P. 3. The method of mounting a lead wire according to claim 1, wherein when the lead wire is directly below the lead wire, the lead wire deviates from the straight line connecting this point and the terminal insertion point. 4. The locus drawn by each point on the substrate directly below the position P is an arc whose center is on a line segment l perpendicular to the lead wire discharge direction of the lead wire supply unit. A method for mounting a lead wire according to item 2 or 3. 5. The locus drawn by each point on the substrate directly below the position P initially draws a circular arc with its center on the line segment l perpendicular to the lead wire discharge direction of the lead wire supply unit, and then The lead wire mounting method according to claim 1, 2, or 3, wherein the lead wire is along a straight line that crosses a circular arc and heads toward a terminal insertion point. 6 The locus drawn by each point on the board directly below position P initially draws a circular arc whose center is on a line segment l perpendicular to the lead wire discharge direction of the lead wire supply unit, and then a tangent line tangent to this arc. The lead wire mounting method according to claim 1, 2, or 3, wherein the lead wire is mounted along a straight line toward the terminal insertion point.