JPH0126782B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a lead wire cutter for cutting a large number of surplus lead wires protruding from the back surface of a printed circuit board to a fixed size.

<Prior Art> Conventionally, a cutter for cutting lead wires of a printed circuit board is placed on a rotating disc cutter supported horizontally, and is fed horizontally with the board from which the lead wires protrude facing downward, close to the cutting edge of the cutter. Generally, a device is used to cut the lead wire to a fixed size. This device is divided into two types: one is the so-called rail type, in which the board is inserted into the inner surface of a pair of rails arranged horizontally and parallelly on the cutter, and is guided so as to move straight; The carrier is guided by a guide rod and travels horizontally.
It is broadly divided into the carrier type, in which the substrate is fixedly placed and the substrate is pressed against the edge of the cutter by moving a carrier.

<Problems to be Solved by the Invention> However, the conventional rail-type type is not efficient in that it is possible to cut the lead wires of subsequent boards one by one by continuously feeding a large number of boards between the rails for boards of the same width. Although this has the above advantages, it is difficult to cut a small board or a thin board, and if the board 27 is warped upward or downward as shown in Fig. 5, it is necessary to cut the lead wires to the same length. There is a technical difficulty in cutting while correcting the distortion of the moving board, especially since there are electronic components on the front side and high-density lead wires of different lengths and thicknesses protruding from the back side. Difficult to correct mechanically. In addition, with the carrier type, the board is attached to the carrier itself, so even small and thin items can be installed, and items with upward curvature can be cut relatively easily as they can be held down from above avoiding the component position, but with downward curvature it is possible to cut them relatively easily. In addition, since the rail width and carrier width are fixed, a correspondingly large carrier is required for large boards, and when cutting, it is necessary to attach and hold the board to the carrier. This method requires six steps: setting up the device, cutting it, opening the holding device, and removing it, and it is inconvenient that it is not possible to continuously cut the lead wires of a large number of boards.

<Means for Solving the Problems> The printed circuit board lead wire cutter of the present invention has a table 3 that horizontally supports a disc cutter 2.
At the top, two horizontal rails 13 and 15 on which the board 27 is placed and which guides its movement in the front and back direction are provided so that the left and right positions can be adjusted and set freely. The vertical rods 51, 53 are attached so that the vertical rods 51, 53 run in the front-rear direction using the tracks 13 or 15, and one end is connected to the vertical rods 51, 53.
53, the other end is an open end, and inside thereof there are two bolts that are fastened and fixed to the other end of the vertical rods 51, 53 so as to be adjustable in left and right positions. Horizontal rods 55 and 57 are provided, and the vertical rods 51 and 53 and the horizontal rods 55 and 57 constitute a frame-shaped carrier 49. It is characterized in that an attachment 79 which is brought into contact with the ground at the end is provided so as to be fastened so as to be adjustable in left and right positions.

<Operation> The board 27 is placed on the board guide surface 23 of the rails 13, 15, and while the rails 13, 15 are brought together from both sides, the interval between the rails 13, 15 is determined, and the rails 13, 15 are placed at the position of the disc cutter 2. The rails are set by aligning them. During rail movement, the carrier 49 has its vertical rods 51 and 53 engaged with the rails 13 and 15, and both ends of one or both of the vertical rods 51 and 53 are engaged with the horizontal rods 55 and 5.
7, it slides in the engagement position, and when the rail position is determined, the engagement position is tightened and fixed, and the carrier 49 is fixed to the frame.

Next, the board guide surfaces 23 of the rails 13 and 15,
A board 27 of a fixed width is dropped into 23 from above, and the rear end is attached to the attachment 7 of the carrier 49.
9 comes into contact with each other, and by moving the carrier 49 straight forward, the board 27 slides on the board guide surface and moves straight, and at this time, the lead wire 29 protruding from the bottom surface of the board 27 is cut to a fixed size by the disc cutter 2. is cut off. Next, the next board 27 is dropped onto the board guide surfaces 23, 23, the carrier 49 is moved backward, and the lead wire of the next board 27 is cut by moving the carrier 49 again in the same manner as above, and this operation is repeated thereafter. , the lead wire is cut.

<Example> a Guide mechanism for substrate and carrier Figures 1 to 4 show various mechanisms on the operating table of the lead wire cutter, and the table 3 of the main body 1
A disc cutter 2 for cutting lead wires is rotatably supported at the upper center slightly toward the rear, and near the front and rear ends of the table 3 is fixedly mounted horizontally and parallelly on two sets of bearings 5. Two pivotally supported guide shafts 7 are provided. The guide shafts 7, 7 are each provided with two sleeve-shaped support guides 9, 9 which are fitted to the guide shafts 7, 7 so as to be slidable left and right.
9 has a structure in which the slide position can be set according to the width of the substrate 27 and the position of the disc cutter 2 using a set bolt 11 or the like. Further, the guide shaft 7 may have a square cross section or may be screwed in opposite left and right directions, and the support guide 9 may be correspondingly formed with internal threads.

Of the four support guides mentioned above, the ones on the left and right sides of each guide shaft 7, 7 form a set, and on each set of support guides 9, 9 there are two straight guides ( The left and right rails 13 and 15 are each fixedly mounted, and the rails 1
3 and 15 have a mechanism that allows them to move horizontally from side to side while maintaining a parallel state and adjust the interval between them, and their front and rear ends protrude from the front and rear of the table 3.

The rails 13 and 15 have a cross section formed in two steps on the upper surface, and the rail main body 21 is composed of a guide portion 17 projecting upward at the outer position and a running surface 19 forming a horizontal surface inside the guide portion 17.
and a board guide surface 23 which is fixed to the bottom surface of the rail body 21, whose inner ends protrude from the inner surface of the lower end of the rail body 21, and whose upper surface of the protrusion is straight through.
It is composed of a plate-shaped guide plate 25 that forms a.

Both ends of the board 27, on which printed wiring and parts are mounted, are placed on the guide surface 23, and are slid from the rear to the front while being guided by the inner surface of the rail body, and are moved by the disc cutter 2 along the way. Therefore, the lead wire 29 protruding from the lower surface is cut to a fixed size. In order to prevent the substrate 27 from moving in the vertical direction while moving forward during cutting, the following guide mechanism is provided on the disk cutter 2 and immediately after the substrate 27.

That is, each inner surface of the rail main body 21 at a position where the board 27 approaches the disc cutter 2 has a constant depth and a constant length in the front-rear direction, and the inner surface and the inner surface of the front and rear ends communicate at least upwardly. A facing guide accommodation recess 31 is formed, and the guide accommodation recess 31 has a thickness such that its side surface protrudes by a certain amount onto the substrate guide surface 23, and is fitted in contact with the inner surface of the front and rear ends of the guide accommodation recess 31. Key-shaped holding guide 3 having a length
3 are fitted to each other so as to be vertically slidable. This presser guide 33 has a long hole 3 in the vertical direction.
5, 35 are drilled in the front and back, and set screws 37, 3
At 7, it is fastened to the rail body 21 so that its vertical position can be freely adjusted.

The bottom surface of the holding guide 33 and the board guide surface 23
By adjusting the distance between the board 27 and the board 27 according to the thickness of the board 27 passing through this (the lead wire is to be cut), the board 27 is held from above and below and runs horizontally without vertical vibration and moves forward. . At this time, the rear end surface of the holding guide 33 is rounded or chamfered to a certain degree so that the substrate 27 can be smoothly guided between the bottom surface of the holding guide 33 and the substrate guide surface 23.

On the other hand, the bottom surface of each guide plate 25 corresponding to the disc cutter 2 has a size that can accommodate the rails 13 and 15 so that the rotation of the disc cutter 2 is not hindered even when the rails 13 and 15 are at the minimum spacing. A planar recess 39 is formed, and by forming this recess, the distance between the substrate guide surface 23 and the cutting edge of the disc cutter 2 during lead wire cutting is sandwiched, and the uncut dimension of the lead wire 29 is shortened accordingly.

b Safety cover A safety cover 41 made of a plate having a certain width and length in the front-rear direction protrudes horizontally from the outer surface of the rails 13, 15 at a position corresponding to the disc cutter 2, and extends horizontally to the outside of the rails 13, 15. It is fixed with screws 43 or the like so as to cover the top of the disc cutter 2 protruding from the outside. This safety cover 41 has an L inner end.
A fixed cover 41a that is bent into a shape and fixes the bent portion along the outer surface of the rail, and a movable cover 41 that is expanded and contracted further outward from the outer end along the upper or lower surface of the fixed cover 41a.
It is composed of b. In the illustrated example, slits 45 of the same pitch in the left and right directions are formed in the front and back positions of each cover 41a and 41b, and the movable cover 41b is placed under the fixed cover 41a to allow the covers 41a and 41b to be stacked up and down. The structure is such that a screw 47 penetrating through is passed through the overlapping slit 45, and the expansion/contraction length is adjusted and the screw 47 is tightened and fixed.

c. Carrier Device A carrier 49 as shown in FIG. 2 is placed on the rails 13, 15 so that it can freely run back and forth while being guided by the rails 13, 15. The carrier 49 is framed in a rectangular shape when assembled, and includes two vertical rods 51 and 53 that run in the same direction as the rails 13 and 15 and that fit into each rail 13 and 15 and travel straight in the front and rear direction.
Two horizontal rods 55, 57 with angular cross-sections whose ends are orthogonally fixed to the front or rear ends of 1, 53.
It forms a frame.

That is, the front horizontal rod 5 is attached to the front end of the left vertical rod 51.
5 and the right end of the rear horizontal rod 57 are integrally fixed to the rear end of the right vertical rod 53 to form L-shaped frame pieces 59 and 61,
A slit 63, 63 in the left and right direction is cut in the center of each side of each horizontal rod 55, 57 having an angular cross section, and correspondingly, the rear end of the vertical rod 51 and the front end of the vertical rod 53 are connected to the horizontal rod 55. or 57, and are fastened and fixed by set bolts 65 through the slits 63, 63, respectively, so that they can be freely attached and detached and their left and right positions can be adjusted.

d Running roller of the carrier device Brackets 67, 67 are attached to the bottom surface near the front and rear ends of each vertical rod 51, 53 so that the end portions protrude in the horizontal direction, and the left and right protruding ends of each bracket 67 Guide rollers 69, 69 made of a pair of bearings, etc. are supported at a constant interval in the vertical axis direction, and these guide rollers 69, 6
9, the left vertical rod 51 accommodates the guide portion 17 between the guide rollers 69, 69 so as to sandwich the guide portion 17 of the left rail 13 from both left and right sides, and 53
The guide portion 17 is accommodated from below between the guide rollers 69, 69 so as to circumscribe both sides of the guide portion 17 of the right rail 15. As a result, the vertical bars 51, 53 are determined to follow the spacing between the rails 13, 15, and after the spacing between the rails 13, 15 is determined by the set bolt 11, the vertical bars 51, 53 and the horizontal bar 55 are fixed by the set bolt 65. ,57
It has a mechanism to fix it with.

Further, on the bottom surfaces of the vertical rods 51 and 53 near the position where the guide roller 69 is provided (in the example shown, inside the longitudinal direction), a support roller 73 made of a bearing or the like is installed in the horizontal direction via a bracket 71. The support roller 73 is in contact with the upper surface of the running surface 19 of the rails 13 and 15 to support the carrier 49 itself so that it can freely move forward and backward on the rail. Rail 13, 15
A stopper 76 is attached to the end of the carrier 49 to prevent it from coming off the rail.

e Attachment for engaging the board On the inner surface of the horizontal rod 57 at the rear of the carrier 49, there is a bracket 7 whose upper and lower ends are bent into an L-shape.
5 is removably fastened so as to protrude downward by a set bolt 77 inserted through a slit 63 on the upper surface of the horizontal rod 57, and furthermore, an attachment 79 whose tip abuts the rear end of the board 27 is installed horizontally at its lower end. It is removably attached in the direction. This attachment 79 has a longitudinal slit 80 in its center, through which a bolt 82 is passed and is attached so that its longitudinal position can be adjusted.

The tip of the attachment 79 comes into contact with the rear end of the board 27 supported horizontally on the board guide surfaces 23, 23 from below, and by moving the carrier 49 forward, the board 27 It functions to move itself horizontally forward.

f Board straightening device Upward-facing brackets 81, 81 are attached to the front and rear ends of the outer surface of the right (or left) vertical rod 53, and the front and rear ends of the plate-shaped guide rod 83 parallel to the vertical rod 53 are attached to the front and rear ends of the vertical rod 53. The end is rotatably supported. A slider 85 that slides in the front-rear direction along the passage surface of the guide rod 83 is fitted to the guide rod 83 so that the position of the slide can be adjusted and detached. A slide arm 87 is slidably fitted, and this slide arm 8
7 is adjusted and set in position by a set bolt 89, and slides around the fulcrum of the guide rod 83 while abutting against the upper surface of a plate-shaped stopper 91 protruding from the opposing vertical rod 51. It will be stopped.

One or more rod holes 93 are protruded from the center of the slide arm 87.
The board 27 whose tip is at the bottom of the carrier 49
A presser rod hole 95 of such a length that it can reach and press the upper surface of the presser rod is fitted downwardly and in such a manner that its protruding length can be adjusted. By rotating the arm 87 downward, the upward warpage of the substrate 27 located below the arm 87 is corrected during lead wire cutting.

Further, the rod 95 is not brought into direct contact with the substrate 27, but is hollow inside and used as an air nozzle. High-pressure air is sent from the upper end of the rod and blown onto the upper surface of the substrate from the tip, and the air pressure directs the substrate 27 upward. It is also possible to temporarily correct warpage.

On the other hand, an upward air nozzle 97 is provided at a position near the rear edge of the disc cutter 2 so that its tip is located 30 to 40 mm below the cutting edge of the disc cutter 2. At the moment when the wire 29 is cut, compressed air of, for example, about 4 kg/cm ² is blown from the underside of the substrate 27 to temporarily correct the downward warpage. The air nozzle 97 is made of an L-shaped pipe, and is inserted into and supported by a nozzle holder 101 fitted to the rear guide shaft 7 so that rotation, left-right movement, and positioning sets are possible using set bolts 99 or the like. The nozzle holder 101 is provided with a chuck 103 that allows the position of the nozzle 97 to be set, providing a mechanism that allows the position and direction of the nozzle 97 to be freely adjusted.

In the above embodiment, the carrier 49 is connected to the vertical rod 5.
1, 53 and horizontal bars 55, 57 joined in an L shape, but either one of the vertical bars 51
Or, fix one end of the horizontal rods 55, 57 in parallel to both ends of the vertical rod 53, form a U-shape with the other end open, and connect both ends of the other vertical rod 53 or 51 between the horizontal rods 55, 57. The set bolt 65 can be accommodated in the left and right positions so that the left and right positions can be adjusted freely.
The function of the carrier 49 is completely the same as that of the illustrated example.

<Effects of the Invention> As a result of the present invention having the structure described above, it is possible to continuously supply and continuously cut substrates using a rail-type conventional lead wire cutter, and the cutting operation is efficient, and it is possible to cut large and thick substrates. In addition to being easy to cut, it is also easy to correct warping, which is an advantage of the carrier type, and it is relatively small, making it possible to process thin substrates and attaching equipment for that purpose, which is better than the conventional carrier type. This has advantages such as eliminating the need for processes such as mounting and removing the board, which are disadvantageous.

In particular, these effects are due to the fact that when the rail width is adjusted, the width of the carrier running on the rail can also be adjusted accordingly.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the overall structure of an operating table for a lead wire cutter according to the present invention, FIG. 2 is an exploded perspective view of a carrier mounted thereon, and FIG. 3 is a perspective view showing the structure of the operating table. 4 is a partially sectional front view, FIG. 4 is a partially sectional side view, and FIG. 5 is an explanatory front view showing a deformed state of the printed circuit board. 1: Main body, 2: Disk cutter, 3: Table,
5: bearing, 7: guide shaft, 9: support guide, 11: set bolt, 13, 15: rail, 17: guide section, 19: running surface, 21: rail body, 23: board guide surface, 25: guide plate,
27: Board, 29: Lead wire, 31: Guide housing recess, 33: Holding guide, 35: Long hole, 37:
Set screw, 39: Recess, 41: Safety cover, 41
a: Fixed cover, 41b: Movable cover, 43: Screw, 45: Slit, 47: Screw, 49: Carrier, 51, 53: Vertical rod, 55, 57: Horizontal rod, 5
9, 61: Frame piece, 63: Slit, 65:
Set bolt, 67: Bracket, 69: Guide roller, 71: Bracket, 73: Support roller,
75: Bracket, 76: Stopper, 77: Set bolt, 79: Attachment, 80: Slit, 82: Bolt, 83: Guide rod, 85: Slider, 87: Slide arm, 89: Set bolt, 91: Stopper, 93: Rod hole ,9
5: rod, 97: air nozzle, 99: set bolt, 101: nozzle holder, 103: chuck.

Claims (1)

[Scope of Claims] 1. Two horizontal rails 13 and 15 on which the board 27 is placed and which guides its movement in the front and back direction on the table 3 that horizontally supports the disc cutter 2.
The rails 13 and 15 are provided so that the left and right positions can be adjusted and set freely.
Alternatively, the vertical rods 51 and 53 are installed so that they run in the front and rear direction with 15 as a track, and one end is connected to the vertical rod 5.
1 and 53, and the other end is an open end, and the other end of the vertical rods 51 and 53 is fastened and fixed to the other end of the vertical rods 51 and 53 so that the left and right positions can be freely adjusted. Horizontal rods 55 and 57 are provided, and the vertical rods 51 and 53 and the horizontal rods 55 and 57 constitute a frame-shaped carrier 49. A lead wire cutter for a printed circuit board, which is provided to tighten an attachment 79 that is brought into contact with the rear end so as to be adjustable in left and right positions. 2. The rails 13, 15 have a guide portion 17 whose cross section protrudes upward on the outside so that the upper surface is formed in two or more stages, and a running surface 1 that forms a horizontal surface inside the guide portion 17.
9, and the rail body 2
A plate-shaped guide plate 2 that protrudes from the inner surface of the lower end of 1 and forms a substrate guide surface 23 through which the upper surface of the protrusion is straight.
5. A lead wire cutter for a printed circuit board according to claim 1, comprising: 3. The horizontal rods 55, 57 of the carrier 49 have an angular cross section with the inner surface fixed inward, and a slit 63 along the longitudinal direction is formed on at least one side of the angular cross section, and the set bolt 65 is inserted through the slit 63. The lead wire cutter for a printed circuit board according to claim 1 or 2, having a structure in which the end portions of the vertical rods 51 and 53 are fastened and fixed by inserting the cutter.