JPH0147920B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves supplying a predetermined amount of a partially soldered continuous material, shaping it, cutting it, and then placing the shaped and cut wire material at a predetermined position on a printed circuit board. This invention relates to an automatic wire insertion machine.

Generally, in high jumper wires, the parts that are not inserted into the printed circuit board are covered with insulation, and
Since the part inserted into the printed circuit board is soldered, a material that is suitable for soldering is formed.
As shown in Figures 1 and 2, this high jumper wire is inserted into a printed circuit board.
In order to provide stray capacitance between the jumper wires 200, they must be inserted while floating at a certain height above the printed circuit board 202.

Conventionally, there was no device for automatically inserting this type of high jumper wire, and high jumper wires were manually inserted by humans, which could not meet the high speed insertion takt required for mass production.

Incidentally, as shown in FIG. 3, the general jumper wire 201 does not require an insulating part because it only needs to be connected from point to point and can be brought into close contact with the printed circuit board 202. Therefore, it is sufficient to use a wire with good solderability and a conductive material layer formed on the surface, cut it to a certain length, bend both ends, and insert it into the printed circuit board. In order to automate the work, devices such as those shown in Figures 4 and 5 were used. This conventional jumper wire insertion machine will be explained.

In FIG. 5, reference numeral 1 denotes a wire holder, and a hoop-shaped coated jumper wire 2 set on the wire holder 1 passes through a guide 3 and enters a strainer section 4 from a tension section 3, where the coated jumper wire The wire is removed from the wire and delivered to the insertion section 6 by the wire feeding section 5, where it is cut to size, coated, formed, and inserted.

This conventional device was unable to insert high jumper wires because it was not equipped with a supply unit that detected continuity and supplied wire at a constant pitch.

The present invention provides a conduction detection function in the wire feeding section,
It is possible to feed the wire in a way that absorbs variations and errors in the soldering process of high jumper wire.
Therefore, an apparatus is provided which enables automation up to the insertion into a printed circuit board, and one embodiment thereof will be described below with reference to FIGS. 6 to 21. Reference numeral 7 designates a bobbin around which a raw wire 7a is wound.The raw wire 7a is drawn out from this bobbin 7 and carried out by a supply reel 8. 9 is a tension lever, which is provided between the supply reel 8 and the bobbin 7;
It comes into contact with the original wire 7a and acts to apply a certain tension. 10 is a soldering device, which solders the raw wire 7a carried out from the bobbin 7 at a constant pitch;
While forming a conductive part, the wire is advanced a certain length by a fixed pitch feeding device 11, and the wire is wound onto a winding position regulating reel 12.
Then, adjust the position so that the winding can be properly wound onto the winding bobbin 13.

13 is a bobbin, 14 is a wire supply unit, 15
17 is a cutter unit, and 18 is an XY table that can freely move the printed circuit board 19 back and forth and left and right.

In the above configuration, the polyurethane coated wire is fed in one direction from the 8 supply reels to the soldering device 10 by the constant pitch supply device 11, heated to a predetermined temperature, and the solder spout width, solder flow rate, wire supply side tension,
After adjusting the wire feed pitch, winding torque, solder jet timing, etc., and soldering at a constant width and pitch, the wire is wound onto a bobbin 13 via a winding position regulating reel 12.

Next, the soldered wire is fed from one direction by the wire supply unit 14, the wire is formed by the vertical movement of the forming unit 15 by the cam 16, and cut and held by the cutter unit 17 to form the wire into the substrate 19.
It is moved to the top and inserted. The board 19 is
The table 18 moves back and forth and left and right.

The above is an overview of this automatic wire rod insertion machine, and each part will be explained in detail below.

In FIG. 9, 24 is a chuck member;
It is rotatable about a fulcrum 25, the distal end 24a has a wedge shape, and the rear end is provided with a U-shaped groove 24b. 24c is a pin, rotary solenoid 2
3 and the U-shaped groove 24b of the wedge-shaped rod are engageably connected.

In this configuration, the conductive part 20a and the insulating part 20
The wire rod 20 having the shape b is sandwiched between the wedge-shaped rod 24 and the chucking base 27, and
is pushed forward a certain length in one direction by the cylinder 26, which has a stroke longer than the wire feed pitch P, and when the rotary solenoid 23 rotates, the wedge-shaped rod 24 draws an arc and moves away from the wire 20, and the wire is no longer held. To be released.

FIG. 10 is an enlarged view of the main part of FIG. 9, and is a diagram for explaining a method of detecting a conductive portion of a wire.
In the figure, continuity is detected between the contact 28 and the base 29, and the conductive part 20 of the wire 20 is soldered.
An ON signal is generated at point a, and an OFF signal is generated at unsoldered insulating section 20b. FIG. 11 shows the above signal. Since the rotary solenoid 23 is rotated at the falling edge of this signal, the holding of the wire is released as described above. Since point A is the falling edge of the signal, the rotary solenoid 23 rotates and the wedge-shaped rod 24 separates from the wire 20 while the wire 20 is fed in the direction C only to the feed pitch P, that is, to point B. , the feeding of the wire rod 20 is stopped. In this way, the stroke of the cylinder 26 is set longer than the feeding pitch p of the wire 20, and in order to feed the wire 20 while detecting the boundary of the conductive part 20a, the soldering pitch p of the wire is set longer. Intermittent feeding of the wire rod is possible while absorbing the variation in the wire rod.

Next, the cutter unit 17 will be explained.

In Figures 11 to 14, 31 is the cylinder 3
A piston 34 having a molded piece 33 at its tip is housed in the cutter unit main body constituting the cutter unit 2 via a compression spring 35. A pair of U- or V-shaped grooves 36 are provided on the inner side of the tip of the molding element 33 to correspond to the insertion pitch of the printed circuit board 19 and are provided along the horizontal center line WW. A pusher 38 having a rod 37 at the rear that slides through the piston 34 abuts against and locks a stopper 40 of the molded member 33 via a compression spring 39. Also, a concave groove is provided on the outer side of the tip of the molding element 33, into which the male blade 41 is slid. Reference numeral 42 denotes a female blade fixed to the cutter unit main body 31, which holds the aforementioned male blade 41 between it and the molded member 33, and each forms a pair of cutters. 43 is a ball (steel ball) that is inscribed in the central hole of the male blade 41 and has a partially concave spherical surface in the outer groove of the molding element 33, as shown in the figure;
Usually, the molded member 33 and the male blade 41 are combined.
44 is a holding lever, and the cutter unit main body 31
The cutter unit body 31 is fixed to an arm shaft 45 which is rotatably supported by the arm shaft 45 and has an arm at one end, and is brought into contact with the cutter unit main body 31 at the bottom via a compression spring 46. Further, a pin 48 that pivotally supports a roller 47 is attached to this arm.

The above is the configuration of the cutter unit 17,
This operation will be explained next. At the wire cutting position, the supplied wire is set to be centered between the male and female blades.

In this state, if air is sent to the cylinder 32 via the air supply hose 49, the piston 34 and the molded member 33 move forward. At the same time, the pusher 38 inscribed in the molded member 33 is compressed by a compression spring 39.
Also, since the male blade 41 is connected by the ball 43, they move forward as one.

Eventually, the tip of the pusher 38 and the holding lever 44
The wire is held between the holding levers 4 and 4.
Since the force of the compression spring 46 of 4 overcomes the force of the compression spring 39 of the pusher 38,
In this state, the pusher 38 stops.

Then, the gap between the male blade 41 and the female blade 42 becomes zero and the wire is cut, and the stepped part 51 of the male blade 41 becomes the female blade 4.
2 until it hits the locking part 52. At this position, the ball 43 is configured to escape into the partially spherical hole 53 provided in the female blade 42, so the connection between the male blade 41 of the molded piece 33 is released, and only the molded piece 33 and the piston 34 are connected to the cylinder. Move forward until you reach the end.

The wire rod cut during this time is bent by the holding lever 44 and guided to the guide 36 of the molding element 33.

As described above, the cutter unit 17 can cut a wire of a fixed size from a supplied wire by sending air and hold the wire in a bent and formed state.

Also, when inserting (described later), if the arm 45 is rotated in the direction of arrow C, the pusher 38 and the holding lever 44
is released from the clamping state, and the pusher 38 moves forward by the compression spring 39 to push out the shaped wire.

Note that 54 is a mounting hole provided on the upper part of the cutter unit main body 31, and the insertion shaft 5 is connected with a screw 55.
It is fastened to the pinion shaft 57 of No. 6.

Next, a specific structure for inserting the wire into the substrate will be described with reference to FIGS. 15 to 19.

The insertion shaft 56 is pivotally supported by the insertion head main body 58 so as to be vertically slidable.

Reference numeral 59 designates a drive shaft whose shaft portion is pivotally supported in an inner hole of the insertion shaft 56 so as to be vertically slidable, and reference numeral 60 designates an adjustment nut attached to the central threaded portion of the insertion shaft 56. 61 is a compression spring interposed between the insertion head main body 58 and the adjustment nut 60. The insertion shaft 56 is pressed downward by the compression spring 61, but is stopped by the stepped portion 62 of the drive shaft 59.

63 is a spherical bearing attached to the tip of the head arm 64, and the inner race 65 of this spherical bearing 63
The drive shaft 59 and the head arm 64 are connected by fixing them with nuts 66 and 67.

57 is a pinion shaft for rotating the cutter unit main body 31. 68 is a flange that pivotally supports the shaft portion of the pinion shaft 57, and is located at the right end of the insertion shaft 56;
Make up the left part.

69 is a slide rack that meshes with the pinion shaft 57; 70 is a slide groove for sliding the slide rack 69; 64 is a compression spring interposed between the inside of the slide rack 69 and the bracket 88, which keeps the slide rack 69 upward at all times. Push up and insert head body 5
The right end of the insertion shaft 56 is always in contact with the lower surface 71 of the insertion shaft 56 .

A slider 72 slides in a groove 73 of a flange 68 of the insertion shaft 56, and is connected to the stepped portion 62 of the drive shaft 59 via a pin 74.

This slider 72 has a regulating block 75 that regulates the looseness of the cutter unit main body 31 during insertion (described later), and a release cam 76 that rotates the arm 45 of the holding lever 44 in the direction of arrow C to release the clamping of the wire rod. installed. A regulating lever 77 is attached to the shaft end of the pinion shaft 57, and is adjusted and fixed with a screw 80 so that it comes into contact with the abutment surface 79 of the aforementioned regulating block 75 when inserted.

Reference numeral 81 denotes a stopper that stops the rotation at the rear end 82 of the cutter unit body 31 when the cutter unit body 31 rotates and becomes vertically downward.

Reference numeral 83 denotes a feed shaft for vertically moving a unit 84 for forming a wire rod, and is pivotally supported by the insertion head main body 58 so as to be vertically slidable. A pin 85 connects the feed shaft 83 and the feed arm 86.

Reference numeral 87 is a compression spring interposed between the insertion head main body 58 and the feed shaft 83, which constantly pushes the feed shaft downward.

Next, a method for inserting the wire into the board will be explained.

In FIG. 15, the pinion shaft 57 supported by the tip flange 68 of the insertion shaft 56 has a slide rack 69 that engages with the pinion shaft 57 due to this rise and is in contact with the lower surface 71 of the head main body, so that the pinion shaft 57 is moved counterclockwise. rotation (arrow D) is applied, and as a result, the cutter unit 17 rotates counterclockwise,
When the wire fed from the wire supply unit 14 is cut off and held in the cutter unit 17, which molds and holds the wire, the drive shaft 59 begins to descend, and the insertion shaft 56, which is being pushed downward by the spring 61, also begins to descend at the same time.

When the slide rack 69 starts to descend, it is constantly pushed upward by the built-in compression spring as the slide rack 69 begins to move downward, so the pinion 57 that is meshed with the rack is pushed up relatively.
As a result, the cutter unit main body 31 also rotates clockwise, and the molded wire is positioned above the printed circuit board 19 at the rear end 31' of the cutter unit main body 31.
to the stopper 81 to prepare for insertion. From here, if you descend a certain amount in a vertical position, the adjustment nut 6
1 hits the insertion head main body 58 and stops the lowering of the insertion shaft 56. At this time, if the adjustment nut 61 is adjusted and fixed so that the tip of the molded piece of the cutter unit 17 contacts the top surface of the printed circuit board 18 at the position where the adjustment nut 61 contacts the insertion head main body 58, the printed circuit board 18 can be fixed.
The molded member's guide groove 36 can be brought into the insertion hole without applying any external force to the molded member 8.

Further, even after the insertion shaft 56 stops descending, the drive shaft 59 continues to descend independently, and the slider 72 connected by the pin 74 also descends along the groove 73 of the flange 68. Following this downward stroke, the regulating surface 19 of the regulating block 75 attached to the slider 72 and the regulating lever 78 immediately come into contact, locking the rotation of the cutter unit body 31, and furthermore, the cam surface 76' of the cam block 76 locks the arm shaft. 45
The holding lever 44 is rotated in the direction of arrow C via the roller 47 to release the clamped wire.

When the holding lever 44 releases the wire, the pusher 38 pushes the component downward by the force of the compression spring 39 and bends the wire into the guide 36 of the molding element which is already guiding the part into the insertion destination of the printed circuit board to be inserted. Drive shaft 5 to ensure extrusion
The stepped portion 62 of 9 pushes down the rear end of the rod of the pusher 37 until insertion is completed.

When the insertion is completed and the drive shaft 59 reaches the bottom dead center, the air sent to the cylinder 32 of the cutter unit body 31 is cut off and the piston 34 is returned to its original state.

After passing the bottom dead center, only the drive shaft 59 begins to rise, performing the reverse operation of the step part 62 mentioned above when lowering, and then locking the insertion shaft 56 with the step part 62 and moving it together as one body. It begins to rise. From here, the rack 69 comes into contact with the lower surface 71 of the head body again, and the pinion 5
7 and the cutter unit main body 31 rotate counterclockwise and return to the original position. The above is insertion operation 1
It's a cycle.

FIG. 20 is a diagram schematically showing the steps of winding the raw wire, soldering, forming, cutting, bending, and inserting.

In this embodiment, a polyurethane coated wire is used, but other coated wires may be used, as long as the conducting wire is coated with a resin that melts with soldering heat.

According to the above embodiment, since the wire feeding section is equipped with a continuity detection function, the configuration can be simplified, and the wire can be fed while absorbing variations and errors in the soldering process of the wire. It facilitates support for automatic mounting equipment in which the printed circuit board is inserted into a predetermined position, and is also advantageous in terms of component management and inspection.

As described above, according to the present invention, the process from processing the material to insertion can be performed by a series of automatic equipment without any manual effort, which is advantageous in reducing cost and time. In particular, by using a series of automatic mounting equipment, the insertion tact speed can be increased, the automatic insertion rate can also be improved, and the production capacity of the line can be improved by combining several equipment into a line.

[Brief explanation of drawings]

Figure 1 is a perspective view of a printed circuit board with high jumper wires, Figure 2 is an enlarged front view of high jumper wires, Figure 3 is a perspective view of a printed circuit board with jumper wires, and Figure 4 is a conventional FIG. 5 is a side view of the automatic jumper wire insertion machine, FIG. 6 is a front view of the soldering machine, and FIG. 7 is a diagram of the automatic wire insertion machine according to an embodiment of the present invention. 8 is a plan view of the wire supply unit, FIG. 9 is a side view of the same wire supply unit, FIG. 10 is an enlarged sectional view of the continuity detection section, FIG. 11 is a timing chart of continuity detection, and FIG. 12 is a side view of the wire supply unit. 13 is a side view of the cutter unit, FIG. 14 is a side sectional view of the cutter unit, FIG. 15 is an enlarged sectional view of the insertion head, and
6 is a side sectional view of the insertion head, and FIG. 17 is a side sectional view of the insertion head in the inserted state.
FIG. 18 is a front sectional view of the main part of the insertion head, FIG. 19 is a sectional view taken along the line N--N' in FIG. 17, and FIG. 20 is an explanatory view of the steps from the raw material to molding, cutting, and insertion. 20...Wire rod, 23...Rotary solenoid, 24...Wedge-shaped rod, 26...Cylinder,
27...Chatting base, 28...Contact piece,
29... Base, 33... Molding, 38... Pusher, 41... Male blade, 42... Female blade.

Claims (1)

[Claims] 1 A wire rod having a conductive portion and an insulating portion, a wire rod clamping device that clamps the wire rod, a conductive portion detection device that detects the conductive portion of the wire rod, and the wire rod clamping device are driven to intermittently hold the wire rod. a drive device that feeds out a fixed amount; a wire release device that releases the wire rod clamping device from the wire and stops feeding the wire according to a conductive portion detection signal of the conductive portion detection device; a cutting section located at the cutting section for cutting the wire; a molding device for molding the wire cut by the cutting section into a predetermined shape; and an insertion device for inserting the wire molded by the molding into a substrate. Automatic wire insertion device.