JPS64249Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a method for cutting excess lead wires protruding from the back side of a printed circuit board that has been soldered by moving them onto a cutter rotating at high speed. This invention relates to an improvement of a cutter device for printed circuit board lead wires.

[Prior art]

Conventionally, this type of cutting device for printed circuit board lead wires has been disclosed in, for example, Japanese Utility Model Publication No. 56-6256. This is a device in which both sides of a printed circuit board with electrical components mounted and soldered on the back side are inserted into the grooves of a guide rod with grooves formed on the opposite sides, and then transferred to the top of the cutter. It is.

[Problems to be solved by the invention] By the way, in the above method, at least the opposing side edges of the printed circuit board are inserted and guided into the grooves of the guide rod, so that it is possible to solve the problem with relatively small printed circuit boards. However, if it is a large printed circuit board, the flatness may be lost due to the heat of the solder bath when soldering to the back side, and the board may become curved. Therefore, if the lead wires of the curved printed circuit board are cut with a cutter, a problem arises in that the lead wires in the upwardly curved portion remain long. There were problems such as the lead wire coming into contact with the chassis etc. and causing a short circuit accident.

[Purpose of invention]

This idea was created by focusing on the points mentioned above.
The purpose of this is to flatten the curved part by pressing the pin from above the printed circuit board, and to easily move the pin to the optimum position on the printed circuit board, and to easily remove unnecessary pins. The present invention provides a cutter device for circuit board lead wires.

[Example of idea]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a perspective view of the lead wire cutter device excluding the printed circuit board transfer device, in which 1 is a casing, 2 is rotatably arranged on the upper surface of the casing 1, and spirals are formed in opposite directions from the center. A pair of threaded rods, 3 are guide rods arranged and fixed in parallel with each of the threaded rods 2, 4 is a guide rod 3 inserted through metal fittings 4b attached to both ends, and is movable in the front and back direction in the figure. A pair of guide rods are guided and screwed together with the threaded rod 2, and step portions 4a are formed on opposing surfaces. That is, as shown in FIG. 2, the stepped portion 4a is placed and guided on both sides of the printed circuit board 5, and its thickness _4a1 is equal to the lead wire 6a of the electrical component 6 inserted onto the printed circuit board 5.
The required cut length is, for example, 0.5 mm,
Further, the height _4a2 is approximately equal to the thickness of the printed circuit board 5, for example, 1.6 mm.

Note that a chain (not shown) is wound between the pair of threaded rods 2 described above, and one of the threaded rods 2
When the threaded rod 2 is rotated, the other threaded rod 2 is also rotated synchronously, so that the pair of guide rods 4 guided by the guide rod 3 and screwed onto the threaded rod 2 have a wide gap between them. It becomes rough and narrow. Therefore, the printed circuit board 5 can be placed and guided on the stepped portion 4a of the guide rod 4 while matching the size of the printed circuit board 5.

7 is a circular cutter that rotates at high speed to cut the lead wire 6a of the electrical component 6 of the printed circuit board 5 that is placed on the step 4a of the guide rod 4 and is being moved; 8 is a circular cutter that is placed on the outside of each of the guide rods 4; A printed circuit board transfer device is movably attached to a guide bar attached by a support column 8a parallel to the guide bar.

Next, the printed circuit board transfer device will be explained with reference to FIGS. 3 to 5.

Reference numeral 9 is a long beam with four mounting pieces 9a movably fitted into the guide bar 8 attached to the four corners, and a long hole _9b1 is formed in the rear piece 9b in the advancing direction. A pair of holding plates 10 are movably and fixedly attached to the elongated holes _9b1 by screws 11. In addition, a long hole 10a is formed in this holding plate 10, and a pulley-shaped holding shaft 12 having a groove 12a into which the rear edge of the printed circuit board 5 is inserted is movable and fixed with a screw. 13
installed by. In addition, 14 is a long beam 9
Use it as a push rod for the worker to move it, and insert the back piece 9.
It is fixed approximately at the center of b.

Reference numeral 15 denotes a support metal fitting fixed to the front piece 9c of the long beam 9 by means such as welding, and has a groove 15a into which the front edge of the printed circuit board 5 is inserted.

Then, the left and right side edges of the printed circuit board 5 are placed on the stepped portions 4a of the guide rod 4, the front edge of the printed circuit board 5 is placed in the groove 15a of the support fitting 15, and the rear edge is placed in the groove of the holding shaft 12. 12a to support it. As a result, the printed circuit board 5 is supported by the long beam 9 and guided by the stepped portion 4a of the guide rod 4.
It moves in the direction of the cutter 7 as the long beam 9 moves.

Reference numeral 16 denotes a band-shaped plate rotatably supported by an extension of the front piece 9c of the long beam 9, and a transparent plate 17 made of acrylic resin or the like is attached to this band-shaped plate. This transparent plate 17 has a pin extraction hole 17 at at least one end.
A large number of elongated holes 17b having a diameter a are formed. A pin 18 is inserted into the necessary elongated hole 17b. This pin 18 has a threaded portion 18a at the upper end,
A cut portion 18b is formed to have a thickness slightly smaller than the width of the elongated hole 17b, and a stepped portion 18 is formed to have a larger diameter than the cut portion 18b and to which a washer 19 is locked.
c, and a support column 18 whose tip is formed into a conical shape.
It is formed by d. 20 is a cap nut screwed onto the threaded portion 18a of the pin 18.

The pin 18 is inserted from the lower side of the pin removal hole 17a, and the cut portion 18b is inserted into the elongated hole 1.
When the pin 18 is moved into the elongated hole 17b in parallel to the slot 17b and the cap nut 20 is screwed onto the threaded portion 18a at a desired position and tightened, the pin 18 is secured to the transparent plate by the washer 19 and the cap nut 20. 17 is clamped and fixed. To remove the pin 18 from the transparent plate 17, loosen the cap nut 20 and insert the pin 18 into the pin removal hole 1.
When the washer 19 is moved to 7a and pulled up, the washer 19 also passes through the pin extraction hole 17a, so the cap nut 20
can be pulled out from the threaded portion 18a without completely removing it.

Note that 21 is a fixed plate fixed to the tip end side of the transparent plate 17, and both ends of this plate are supported by the side pieces of the long beam 9.

Next, the operation will be explained based on the above configuration.

First, hold the push rod 14 of the long beam 9 in your hand and move the long beam 9 to the right end in FIG. Next, the printed circuit board 5 is placed on the stepped portion 4a of the guide rod 4, and the front and rear edges of the printed circuit board 5 are inserted into the groove 12a of the presser shaft 12 provided on the long beam 9 and the groove 15a of the support fitting 15 to support it. .

Next, the cap nut 20 is loosened, the pin 18 is moved along the long hole 17b to a portion of the printed circuit board 5 where the electrical component 6 is not located, and the cap nut 20 is tightened. Then, hold the fixed plate 21 in your hand and press the transparent plate 17.
Fold it down as if to put a lid on it. As a result, the pins 18 come into contact with the parts of the printed circuit board 5 where the electrical components 6 are not located, and are pressed by the weight of the transparent plate 17, so that the printed circuit board 5 is not lifted up while being supported by the presser shaft 12 and the support metal fittings 15 described above. . (Figure 5).

Next, when the long beam 9 is moved to the left in FIG. 5 by holding the push rod 14, the lead wire 6a protruding from the back surface of the printed circuit board 5 is cut by the cutter 7 which is rotating at high speed. During this cutting, since the printed circuit board 5 does not lift up, the lead wire 6a can be cut to a constant length and can be cut to a very short protrusion length (for example, about 5 mm).

In addition, in the above-mentioned pressing of the pin 18, the unnecessary pin 18 can be removed by loosening the cap nut 20, moving the pin 18 to the pin removal hole 17a, and pulling it up, so that the pin 18 does not get in the way.

[Effect of idea]

As mentioned above, the present invention involves attaching a transparent plate to the long beam for transporting the printed circuit board guided by the guide rod so that it can be opened and closed, and also attaching a pin to this transparent plate, and using this pin to press the curved part of the printed circuit board. Since the printed circuit board is made flat, the cutter can cut the lead wires evenly, which prevents accidents such as short circuits when incorporating them into equipment. Since the pin can be moved and fixed freely, it is very easy to move the pin to the optimum position on the printed circuit board, and the unnecessary pin can be moved to the pin removal hole formed at the end of the long hole. Since the pin can be removed from the transparent plate by pulling up, the pin can be easily removed.

[Brief explanation of the drawing]

The figures show an embodiment of the cutter device for printed circuit board lead wires according to the present invention, FIG. 1 is a perspective view without the printed circuit board transfer device, FIG. 2 is a sectional view of the guide rod, and FIG. 3 is a cross-sectional view of the guide rod. FIG. 4 is a partially enlarged sectional perspective view of the transparent plate, and FIG. 5 is a perspective view of the transparent plate in FIG. 3 with it closed. 4...Guide rod, 5...Printed circuit board, 6...
Electrical parts, 6a...Lead wire, 7...Cutter,
8... Guide bar, 9... Long beam, 17... Transparent plate,
17a...Pin removal hole, 17b...Long hole, 18
……pin.

Claims (1)

[Scope of utility model registration request] In a printed circuit board lead wire cutter device that cuts electrical component lead wires protruding from the back side of a printed circuit board by moving on a cutter guided by a guide rod and rotating at high speed, a guide bar arranged parallel to the guide rod is used. Therefore, a long beam is provided for moving the printed circuit board, a transparent plate is attached to this long beam so that it can be freely opened and closed, and a long hole having a hole for removing pins is formed at the end of the transparent plate, and the printed circuit board can be moved freely through this long hole. A cutter device for printed circuit board lead wires, characterized in that a removable pin is attached in the pin extraction hole, and the pin presses a curved portion of the printed circuit board to make it flat.