JPS6314978Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) The lead wire end trimming device for printed circuit boards according to this invention is suitable for use with resistors, semiconductors, and other electrical components assembled on the top surface of printed circuit boards used in various electrical appliances and devices. Used to trim the ends of the attached lead wires that protrude from the bottom surface of the printed circuit board.

(Background Art) Resistors, semiconductors, and many other electrical components are soldered to printed circuit boards used in various electrical appliances and devices. In order to solder various electrical components to such a printed circuit board, as shown in FIG. The lead wire 5 of the electrical component 4 is inserted into the small hole 3, and the lead wire 5 and the conductor 2 are soldered. The end of the lead wire 5 inserted through the small hole 3 is in a state of protruding from the lower surface of the substrate 1. Therefore, as shown in FIG.
When a large number of electrical components 4 and 5 are attached to the upper surface of the board 1, a large number of lead wires 5 and 5 protrude from the lower surface of the board 1. Each lead wire 5, 5
Since the lengths of the lead wires 5 and 5 are slightly different,
The amount by which 5 protrudes from the lower surface of the substrate 1 varies.

If the ends of the many lead wires 5, 5 protruding from the lower surface of the substrate 1 are not cut short, the adjacent lead wires 5, 5 may contact each other and shoot, or the lead wires may be shortened. The edges get in the way, making it impossible to attach the printed circuit board to an electrical appliance. Therefore, the large number of lead wires 5, 5 protruding from the bottom surface of the substrate 1 has a protruding amount of 0.8 to 1.5 m/cm from the bottom surface.
It is cut short to about m length. Since it is extremely troublesome work to manually cut the ends of a large number of lead wires using a tool such as a nipper, a rotary blade is used to cut the ends of the large number of lead wires into short lengths. There is. That is, as shown in FIG. 3, a large number of electrical components 4, 4 are attached to a carrier 7 which is horizontally movable along a guide rail 6, and a board 1 with a large number of lead wires 5, 5 protruding from the bottom surface is attached. The carrier 7 is moved manually or by a drive device (not shown) above a rotary blade 9 driven by a motor 8, and the numerous lead wires 5, 5 are shortened by the rotary blade 9. Trim. The carrier 7, on which the board 1 with the lead wires 5, 5 protruding from the bottom surface cut short, is returned to its original position, and then the board 1 with the lead wires cut is taken out and a new one with the lead wires not cut is removed. After the substrate 1 is mounted, the carrier 7 is moved back and forth again to trim and align the lead wires.

However, when trimming the ends of the lead wires of the printed circuit board as described above, the following disadvantages occur. That is, in FIG. 3, after cutting the ends of a large number of lead wires 5, 5 by moving the carrier 7 to the left while rotating the rotary blade 9,
If the carrier 7 is moved to the right, the lower end surfaces of the trimmed lead wires 5, 5 will come into contact with the upper surface of the rotary blade 9, which will not only accelerate the wear of the rotary blade but also damage the entire board 1. This is undesirable because the fine vibrations are added and have an adverse effect on the soldered parts between the lead wire and the conductor and on the electrical components.

(Purpose of the invention) In order to solve the above-mentioned inconveniences, this invention
To provide a lead wire end trimming device which prevents the lower end surface of the lead wire from coming into contact with a rotary blade when returning a carrier to its original position after trimming the lead wire.

(Structure of the invention) The lead wire end trimming device for printed circuit boards of the present invention is capable of sliding and slightly swinging one side edge of the carrier against a horizontal guide rod provided on one side of the carrier. A wheel is provided on the lower surface of the other side edge of the carrier to roll on the upper surface of a horizontal guide rail. Further, the guide rod is vertically movable while remaining horizontal.

When using the printed circuit board lead wire end trimming device of the present invention configured as described above, when trimming a large number of lead wires protruding from the bottom surface of the printed circuit board, first, the carrier 7 is lowered with the guide rod lowered. The guide rod is moved to cut the many lead wires into short lengths, and with all the lead wires cut, the guide rod is raised. As the guide rod rises, the lower end surfaces of all the lead wires are positioned higher than the upper surface of the rotary blade, so the carrier 7 can be moved back to its original position without bringing the lower end surfaces of the lead wires into contact with the upper surface of the rotary blade. can be returned to the position.

(Embodiments of the Invention) Next, the present invention will be explained in more detail by explaining the illustrated embodiments.

FIG. 4 shows an embodiment of a carrier incorporated in the printed circuit board lead wire end trimming device of the present invention. Supports 11, 11 are fixed to the upper surfaces of the four corners of the square frame 10, respectively, and a total of four rods 12, 13, 14, 15 are installed between the adjacent supports.
is being passed over. Among the four pieces 10a, 10b, 10c, and 10d of the square frame 10, two pieces 10a and 10d that are adjacent to each other are provided with a support member 16 that has an L-shaped cross section and has a horizontal portion that protrudes inward. , 16 are fixed. On the other hand, pillar 1
The four rods 12 stretched between 1 and 11
Among 15, rod 12 and rod 1 are parallel to each other.
The plate material 18 that spans the sliding bearings 17, 17 which are slidably attached to the 4 parts has elongated holes 19, 19 in three places.
are drilled, two of which are long holes 19,
Crank-shaped supports 21, 21 whose horizontal portions protrude inward at the lower ends are attached to the plate 18 by screws 20, 20 inserted through the holes 19, and nuts. Board material 1
8 connects the sliding bearings 17, 17 to the rods 12, 14.
By sliding the rods 13, 15 against
The distance between the supporting members 16 and 21 can be adjusted according to the length of the printed circuit board to be mounted on the carrier 7. After adjusting this distance, rotate the screws 22, 22 screwed into both ends of the plate material 18,
Pieces 23, 23 provided at the lower ends of the rods 2 are pressed against the upper surfaces of the rods 12, 14, respectively, to suppress the movement of the plate 18. In addition, two rods 1 that are perpendicular to the rods 12 and 14 and parallel to each other are provided.
Sliding bearings 24, 2 slidably attached to 3, 15
There is a cross section L below the inner edge of the plate material 25 that spans the
A support member 26 in the shape of a letter whose horizontal portion at the lower end protrudes inward.
has been established. The plate material 25 is the rods 12, 14
The space between the supports 16 and 26 can be adjusted in accordance with the width of the printed circuit board to be mounted on the carrier 7. Once this interval has been adjusted, the screw 2 screwed into one end of the plate material 25
7 is rotated to press the piece 28 against the rod 13 to suppress the movement of the plate material 25.
The support member 16 of the carrier 7 configured in this way,
The four peripheral edges are supported by the horizontal portions of the lower ends of the columns 21 and 26, and the upper surfaces are suppressed by restraining plates (not shown) attached to the upper surfaces of the adjacent columns 11 and 11 by hinges or the like.

Constructed as described above, a pair of sliding bearings 29, 29 are arranged at an interval on the lower surface of one side 10a of the square frame 10 of the carrier 7 on which the printed circuit board is placed.
are fixed, and a guide rod 30 extends slidably through these sliding bearings 29, 29. on the other hand,
Below the side 10c opposite to the side 10a is a fifth
As shown in the figure, a wheel 32 is supported by a bracket 31 fixed to the lower surface of the side 10c. This wheel 32 can roll freely on the upper surface of a horizontal rail 33 provided parallel to the side 10c. Therefore, the carrier 7 is movable along the guide rod 30 and the guide rail 33. Further, the heights of the guide rod 30 and the guide rail 33 are determined so that the substrate placed on the carrier 7 and the rotary blade are parallel to each other when the guide rod 30 is lowered to its lowest position, as will be described later.

On the other hand, both ends of the guide rod 30, which supports one side of the carrier 7 in a slidable and swingable manner, are connected to the upper ends of elevating members 35, 35 provided on the base 34 so as to be movable up and down, as shown in FIG. is supported by. A pair of left and right lifting members 35 protruding from the lower surface of the base 34,
The pins 36, 36 protruding from the lower end side of the
An elongated hole 3 bored at one end of the first bell cranks 38, 38, each of which swings about a shaft 37.
9 is engaged. Left and right bell cranks 38,3
The other ends of the rods 40, 40, which have one end pivotally connected to the other end of the rod 8, are respectively pivotally connected to one ends of a pair of left and right second bell cranks 41, 41. axis 4 respectively
A second bell crank 4 that can freely swing around 2
A long hole 43 is bored at the other end of each of the solenoid 44, and a pin 46 protruding from the side surface of the upper end of the tension rod 45 of the solenoid 44 is engaged with the long hole 43.

With this configuration, when the tension rod 45 is pulled downward by energizing the solenoid 44, the second bell cranks 41, 41 move in the direction of the arrow a.
The rods 40, 40 are each pulled in the direction of arrow b. As a result, the first bell cranks 38, 38 respectively rotate in the direction of the arrow c, and the pair of left and right lifting members 35, 35 are raised. 1 of carrier 7 by raising both lifting members.
The guide rods 30 supporting the sides rise, and the carrier 7 swings upwards about the wheels 32, as shown in FIG. Therefore, the lower end surfaces of the lead wires 5, 5 that protrude from the lower surface of the substrate 1 and are trimmed by the rotary blade 9 are located above the upper surface of the rotary blade 9, so that when the carrier 7 moves, the lead wires 5, 5 , 5 will not come into contact with the upper surface of the rotary blade 9.

Therefore, when trimming a large number of lead wires protruding from the bottom surface of the board, move the carrier 7 to the right in FIG. Then, the carrier 7 is moved to the left, and the rotary blade 9 trims the many lead wires protruding randomly from the bottom surface of the substrate. After all the lead wires 5, 5 are trimmed, the solenoid 44 is energized, the guide rod 30 is raised, the carrier 7 is swung to the state shown in FIG. 7, and the carrier 7 is moved to the right. After moving the carrier 7 to the right end of the guide rod 30, the board with the lead wires cut and aligned is taken out. At this time, since the lower end surfaces of the many trimmed lead wires 5, 5 do not come into contact with the upper surface of the rotary blade 9,
Wear on the upper surface of the rotary blade 9 is not accelerated or vibrations are not transmitted to the substrate.

In the illustrated embodiment, the spacing between the supporting members 16, 21, 26 of the carrier 7 is adjustable;
It is possible to place substrates of various sizes on this carrier 7. The structure of this carrier part was jointly devised by Yutaka Tsushima, the inventor of the present application, and Mutsuo Kudo, an employee of the same Koshin Seikosho Co., Ltd., but the gist of the invention is The structure of the carrier is not particularly limited, except that the lower end surface of the lead wire after being trimmed is prevented from coming into contact with the upper surface of the rotary blade when the carrier is returned to its original position. Therefore, when always trimming and aligning the lead wires of boards of the same size, the structure of the carrier can be made simpler than the illustrated example.
Further, the structure for raising the guide rod 30 may also be constructed by arranging two solenoids on the left and right instead of using one solenoid and a plurality of rods or bell cranks as shown in the figure. Furthermore, an air cylinder or the like can be used instead of a solenoid.

(Effects of the invention) The device for trimming and aligning lead wire ends for printed circuit boards of the present invention is constructed and operates as described above, so that the end of the lead wires after trimming comes into contact with the rotary blade, causing wear of the rotary blade, It is possible to completely prevent the transmission of vibration to the rotary blade, which not only extends the life of the rotary blade but also prevents failure of the printed circuit board.

[Brief explanation of drawings]

Figure 1 is an enlarged perspective view showing the part where the lead wires of electrical components are soldered to the printed circuit board, Figure 2 is a side view of the printed circuit board with the electrical components attached, and Figure 3 is an outline of the lead wire end trimming device. A side view, FIG. 4 and subsequent figures show an embodiment of the present invention. FIG. 4 is a perspective view of the carrier, FIG. 5 is a perspective view seen from the direction of arrow A in FIG. 4, and FIG. 6 is a guide rod. FIG. 7 is a partial longitudinal sectional side view showing the elevating mechanism, and FIG. 7 is a sectional view taken along line BB in FIG. 6. 1: Board, 2: Conductor, 3: Small hole, 4: Electrical component, 5: Lead wire, 6: Guide rail, 7: Carrier, 8: Motor, 9: Rotating blade, 10: Square frame, 1
0a, 10b, 10c, 10d: Side, 11: Support, 12, 13, 14, 15: Rod, 16: Support material, 17: Sliding bearing, 18: Plate material, 19: Long hole, 20: Screw, 21: Support Material, 22: Screw, 2
3: Piece of piece, 24: Plain bearing, 25: Plate material, 26:
Support material, 27: Screw, 28: Piece, 29: Sliding bearing, 30: Guide rod, 31: Bracket, 3
2: Wheel, 33: Guide rail, 34: Base, 3
5: Lifting member, 36: Pin, 37: Shaft, 38: First bell crank, 39: Long hole, 40: Rod,
41: second bell crank, 42: shaft, 43: long hole, 44: solenoid, 45: tension rod.

Claims (1)

[Scope of utility model registration request] One side of an open-bottomed carrier supporting the edge of a printed circuit board to which many electrical components are soldered and many lead wires protruding from the underside is slidably and swingably supported by a guide rod, A wheel provided on the other side of this carrier is placed on the top surface of a guide rail parallel to the guide rod, and a wheel slightly below the bottom surface of the printed circuit board placed on the carrier is placed between the guide rod and the guide rail. A device for trimming and aligning lead wire ends for printed circuit boards, which is provided with a rotating rotary blade, and both ends of a guide rod are supported by members that can be raised and lowered.