JPH0131379Y2 - - Google Patents

Description

[Detailed description of the invention] a. Purpose of the invention (industrial application field) The printed circuit board lead wire end trimming device according to this invention is a resistor assembled on the top surface of a printed circuit board used in various electrical appliances and devices. It is used to trim the ends of lead wires attached to semiconductors and other electrical components that protrude from the bottom surface of the printed circuit board.

(Prior 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, 4 are attached to the upper surface of the board 1, a large number of lead wires 5, 5 protrude from the lower surface of the substrate 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 bottom surface of the substrate 1 are not cut short, the adjacent lead wires 5, 5 may contact each other and shoot, or the ends of the lead wires may The printed circuit board gets in the way and makes it impossible to attach the printed circuit board to the electrical appliance. Therefore, the large number of lead wires 5, 5 protruding from the bottom surface of the substrate 1 has a protrusion amount of 0.8 to 1.5 m from the bottom surface.
However, it is extremely troublesome to manually cut the ends of a large number of lead wires using tools such as nippers.
A rotary blade is used to cut the ends of the many lead wires into short lengths. That is, as shown in FIG. 8, a large number of electrical components 4, 4 are attached to a carrier 7 which is provided horizontally movably along a guide rail 6, and a board 1 is mounted on which a large number of lead wires 5, 5 are protruded from the bottom surface. 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 placing the substrate 1, the carrier 7 is moved back and forth again to trim the lead wires.

(Problems to be Solved by the Invention) 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. 8, while rotating the rotary blade 9, the carrier 7 is moved to the left to trim the ends of a large number of lead wires 5, 5.
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 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.

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.

b. Structure of the invention (Means for solving the problem) The printed circuit board lead wire end trimming device of the invention slides one side edge of the carrier against a horizontal guide rod provided on one side of the carrier. The carrier is equipped with wheels that roll on the upper surface of a horizontal guide rail on the lower surface of the other side edge of the carrier. Further, both ends of the guide rod are supported by a pair of elevating members supported by a guide so as to be movable up and down, so that the guide rod can be moved up and down while remaining horizontal. Further, a roller is supported at the lower end of each of the pair of elevating members, and this roller abuts the upper surface of a cam rod disposed below the guide rod. A pair of protrusions are formed on the upper surface of this cam rod at the same intervals as the above-mentioned pair of elevating members, and both ends of this cam rod are connected to the lower ends of a pair of levers whose intermediate portions are pivoted. It is locked in. The upper end of this lever has a fixed part facing the carrier, and when the carrier moves to the end of the guide rail and guide rod, the upper end of one of the pair of levers is pushed. That's what I do.

(Function) 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 move the roller at the lower end of the lifting member to the cam rod. The protrusion on the upper surface is brought into contact with the removed part, and the carrier is moved with the guide rod lowered to cut the many lead wires into short lengths. When all the lead wires were cut and the carrier moved to one end of the guide rod, the part fixed to the carrier pushed the upper end of one of the levers, causing this lever to rotate and lock onto the lower end of the lever. The cam rod is moved in parallel, the roller at the lower end of the elevating member rides on the protrusion, and the guide rod is raised. As this guide rod rises, the lower end surfaces of all the lead wires are positioned higher than the top surface of the rotary blade, so the carrier can be returned to its original position without the lower end surfaces of the lead wires coming into contact with the top surface of the rotary blade. can be returned to position. When the carrier returns to its original position, the part fixed to the carrier pushes the top end of the other lever and moves the cam rod in the opposite direction to the above case, disengaging the roller at the bottom of the lifting member from the protrusion and lowering the guide rod. and prepare for the next trimming of the lead wire ends.

(Example) Next, the present invention will be explained in more detail by explaining the illustrated embodiment.

Figures 1 to 5 show an embodiment of the printed circuit board lead wire end trimming device of the present invention. Figure 1 is a side view when the carrier is lowered, Figure 2 is a similar side view when the carrier is raised, and Figure 2 is a side view when the carrier is raised. Figure 3 is a perspective view of the guide rail side viewed from the direction of arrow A in Figure 5, and Figure 4 is a perspective view of the guide rail side.
5 is a perspective view of the carrier. First, the structure of the carrier 7 will be explained. Supports 11, 11 are fixed to the upper surface of the four corners of the square frame 10, and a total of four rods 12, 13, 14, 15 are hung between the adjacent supports. It has been passed. Four pieces 10 of the above square frame 10
Support members 16, 16 each having an L-shaped cross section and a horizontal portion of the lower end protruding inward are fixed to the lower inner peripheral edges of the two adjacent pieces 10a, 10d among the pieces a, 10b, 10c, and 10d. On the other hand, the pillar 11,
Four rods 12-15 spanned between 11
Of these, elongated holes 19, 19 are bored in three places in the plate 18, which is stretched over sliding bearings 17, 17, which are slidably attached to the rods 12 and 14, which are parallel to each other. long holes 19, 19
The supporting member 2 is shaped like a crank and has a horizontal portion at the lower end protruding inward by screws 20, 20 inserted through the nuts and a nut.
1 and 21 are installed. The plate 18 can be moved parallel to the rods 13, 15 by sliding the sliding bearings 17, 17 against the rods 12, 14, and the length of the printed circuit board to be mounted on the carrier 7 can be adjusted. In addition, the above support material 1
Adjust the spacing between 6 and 21. After adjusting this interval, the screws 22 screwed into both ends of the plate material 18,
22, and connect the pieces 23, 23 provided at the lower ends of the screws 22, 22 to the rods 12, 14, respectively.
The movement of the plate material 18 is suppressed by pressing against the upper surface of the plate material 18.
Further, a cross section L is formed below the inner edge of the plate material 25 which is stretched over sliding bearings 24, 24 which are slidably attached to the two rods 13, 15 which are parallel to each other and are perpendicular to the rods 12, 14, respectively. A support member 26 is provided which is shaped like a letter and whose horizontal portion at the lower end projects inward.
The plate material 25 can be moved while remaining parallel to the rods 12 and 14, and the supports 16 and 25 can be moved in parallel with the rods 12 and 14, and the supporting materials 16 and 25 can be moved in parallel with the rods 12 and 14.
Adjust the spacing. If you adjust this interval,
Rotate the screw 27 screwed into one end of the plate material 25,
The piece 28 is pressed against the rod 13 to suppress the movement of the plate 25. The printed circuit board is supported at its four peripheries by the horizontal portions of the lower ends of the supporting members 16, 21, 26 of the carrier 7 constructed in this manner, and is supported by restraining plates attached to the upper surfaces of the adjacent columns 11, 11 by hinges or the like. The top surface can be suppressed.

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 is inserted through these sliding bearings 29, 29. On the other hand, the above side 10
As shown in FIG. 3, below the side 10c opposite to a, there is a bracket 31 fixed to the bottom surface of the side 10c.
The wheels 32 are supported by. This wheel 32
can freely roll on the upper surface of the horizontal guide rail 33. 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 sliding and swingable manner, are connected to the first to second ends.
As shown in the figure, the guide 3 fixed to the frame etc.
Lifting members 35, 3 provided on 4, 34 so as to be movable up and down
It is supported at the upper end of 5. Guides 34, 34
A pair of left and right lifting members 35, 35 projecting downward.
The lower ends support rollers 36, 36, respectively, and each roller 36, 36 comes into contact with the upper surface of a cam rod 38 that is movable in the horizontal direction guided by rollers 37, 37 provided on the upper surface of the frame, etc. I'm letting you touch me. The pins 39, 39 protruding from the side surfaces of both ends of the cam rod 38 are connected to a pair of left and right levers 40, respectively.
40 is engaged with elongated holes 41, 41 bored at the lower end. The levers 40, 40 are pivotally supported at their intermediate portions by shafts 42, 42 provided on a frame or the like, and their upper ends protrude above the guide rod 30 for guiding the carrier. Guide rod 3 like this
Nuts 43, 43 are fixed to the side surfaces of the supports 11, 11 of the carrier 7, which are opposite to the upper ends of the levers 40, 40 that protrude upward from the levers 40, 40. They are screwed together. This bolt 44, the head 45 of 44,
45, when the carrier 7 moves to the end of the guide rod 30, comes into contact with the upper end of one of the pair of levers 40, 40, and rotates this lever 40 about the shaft 42. . On the upper surface of the cam rod 38, the pair of elevating members 35, 3 are provided.
A pair of protrusions 46, 46 are formed at the same interval as the interval 5, and as the cam rod 38 moves horizontally, the rollers 36, 36 provided at the lower ends of the elevating members 35, 35
are opposed to the protrusions 46, 46 at the same time, so that the left and right lifting members 35, 35 are raised and lowered by the same height at the same time.

Because of this configuration, the left and right pair of levers 40, 40 are rotated about the shafts 42, 42, the cam rod 38 is horizontally moved in the left and right direction, and the rollers 36, 36 at the lower ends of the elevating members 35, 35, 36 is opposed to the protrusions 46, 46 on the upper surface of the cam rod, the pair of left and right elevating members 35, 35 can be raised.
As both lifting members rise, the guide rod 30 supporting one side of the carrier 7 rises, and this carrier 7
As shown in FIG. 4, it swings upward about the wheels 32. 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. 36 to cam rod 3
With the protrusions 46, 46 of 8 in contact with the removed portion and the guide rod 30 lowered, this carrier 7
A board with uncut lead wires is placed on the board, and 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 board. When all the lead wires 5, 5 are trimmed and the carrier 7 is moved to the left end of the guide rod 30 as shown in FIG. 2, the head 45 of the left bolt 44 pushes the upper end of the left lever 40. Each lever 4
0 and 40 in the counterclockwise direction, and move the cam rod 38 to the right in FIGS.
The guide rod 30 is raised to swing the carrier 7 into the state shown in FIG. 4. Thereafter, the carrier 7 is moved to the right, moved to the right end of the guide rod 30, and then the board with the lead wires cut and aligned is taken out. At this time, 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, which may accelerate wear on the upper surface of the rotary blade 9 or cause vibration to the board. It never gets across. When the carrier 7 moves to the right end, the levers 40, 40 are rotated clockwise again and the guide rod 30 is lowered to prepare for the next lead wire end trimming.

In the illustrated embodiment, the spacing between the supporting members 16, 21, 26 of the carrier 7 is adjustable;
This carrier 7 is designed to allow substrates of various sizes to be placed on it, but the gist of the present invention is that the lower end surface of the lead wires after being trimmed by the rotary blade is aligned with the upper surface of the rotary blade when the carrier is returned to its original position. The structure of the carrier is not particularly limited. 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.

c. Effects of the invention The device for trimming and aligning lead wire ends for printed circuit boards of the present invention is configured and operates as described above, so that the end of the lead wire after trimming comes into contact with the rotary blade, causing wear of the rotary blade and damage to the board. It is possible to completely prevent vibration transmission, which not only extends the life of the rotary blade but also prevents printed circuit board failures. or,
Because no noise-generating devices such as solenoids or air cylinders are used to raise and lower the carrier, the work environment inside the room is not degraded, and unlike when using hydraulic cylinders, the movement is slow and equipment is not damaged. It doesn't get bigger.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the printed circuit board lead wire end trimming device of the present invention. Figure 1 is a side view when the carrier is lowered, Figure 2 is a similar side view when the carrier is raised, and Figure 2 is a side view when the carrier is raised. Figure 3 is a perspective view of the guide rail side viewed from the direction of arrow A in Figure 5, and Figure 4 is a perspective view of the guide rail side.
BB sectional view in the figure, Figure 5 is a perspective view of the carrier,
Figure 6 is an enlarged perspective view showing the part where electrical component lead wires are soldered to a printed circuit board, Figure 7 is a side view of the printed circuit board with electrical components attached, and Figure 8 is a conventional lead wire end trimming device. FIG. 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: Guide, 3
5: Lifting member, 36: Roller: 37: Roller, 3
8: Cam rod, 39: Pin, 40: Lever, 41:
Long hole, 42: shaft, 43: nut, 44: bolt,
45: head, 46: protrusion.

Claims (1)

[Scope of utility model registration request] One side of a carrier on which a printed circuit board with many electrical parts soldered and many lead wires protruding from its underside is mounted is slidably and swingably supported on a guide rod, and the other side of the carrier is mounted. A rotary blade that rotates slightly below the bottom surface of the printed circuit board placed on the carrier is provided between the guide rod and the guide rail, and both ends of the guide rod are mounted on the guide rail. The roller is supported by a pair of elevating members that are vertically movably supported on the roller, and the roller supported at the lower end of the elevating member has a pair of protrusions formed on its upper surface at the same interval as the spacing between the pair of elevating members. The upper end portions of a pair of left and right levers are brought into contact with the upper surface of the cam rod, the middle portion is fixed to the shaft, and the lower end is locked to both ends of the cam rod, and the portion fixed to the carrier is opposed to the portion fixed to the carrier. A device for trimming and aligning lead wire ends for a printed circuit board, wherein the fixed portion pushes the upper end of one of the levers when the device moves to both ends.