JPS6147644B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a guide hole punching device for a printed circuit board.

Printed circuit boards have traditionally been widely used in various electronic and electrical devices. This printed circuit board is made of a copper-clad laminate made of phenol paper, epoxy paper, epoxy glass, etc., and the copper foil is printed on the required pattern parts according to the wiring pattern by etching or other methods using photography or screen printing. The copper foil from unnecessary parts was removed. Next, mounting holes for mounting elements such as ICs, transistors, resistors, and capacitors are drilled in the pattern section, and the leads of these elements are mounted through the mounting holes to form a mounting board, which is then soldered using an automatic soldering machine. Alternatively, it can be completed by manually soldering the element and the copper foil of the pattern part and cutting off the excess lead parts.

For large substrates, when screen printing is used, the screen extends in the direction of travel of the roll and in a direction perpendicular to it (for example, 500 mm).
(approximately 1/10 mm), the pattern on the substrate is eventually formed to be deviated from the intended pattern, and accordingly, the aforementioned mounting hole portion is also located at a location deviating from the designed dimension.

By the way, in order to improve productivity and ensure accuracy, the mounting holes of not only large boards but also small boards are of a convex type (upper type) with a large number of protruding pins. Corresponding concave mold (lower mold)
The holes are perforated by a press using a For this purpose, guide holes are formed in the substrate in advance, and
After the substrate is fixed and positioned by fitting guide pins provided on the lower die into the guide holes, the above-mentioned mounting holes are bored by a press. In short, before drilling the mounting holes, a preparatory step is required to drill guide holes for press positioning at predetermined positions (at least two locations) on the printed circuit board.

For this reason, guide hole punching devices have traditionally had a support bar with a long hole formed in it screwed onto the frame so as to be movable laterally.
It is known that a plurality of guide hole drilling drills are screwed into the elongated hole so as to be movable in the vertical direction.

However, in such a guide hole drilling device, in order to obtain alignment between the guide hole drilling position on the board and the center of each drill with an accuracy of about 5/100 mm, the support bar and the drill must be unscrewed one by one. However, there was a drawback in that the extremely troublesome work of re-screwing the screws was required to obtain the desired alignment by visual inspection.

Furthermore, even when the printed circuit board is replaced with a different type (pattern and size), manual alignment work is required each time, requiring great skill and fatigue. Ta.

Moreover, after aligning the center of the drill with the position of the guide hole, it is necessary to actually drill the guide hole and verify that the required alignment has been achieved, which wastes expensive boards in preparation work. This method has the disadvantage that the yield is low as a result of drilling a large number of substrates without noticing that the guide holes are not drilled at the predetermined positions.

In addition, in order to drill such printed circuit board guide holes, an NC multi-spindle drilling machine (Japanese Patent Laid-Open No. 51-134992
Although it is possible to use the method described in Japanese Patent Application Publication No. 2003-122003, it is not possible to roughly move the drill or make fine adjustments in the vertical and horizontal directions, and it is troublesome to align the center of the drill with the center of the guide hole. However, it is difficult to prevent the printed circuit board from bending or warping, and therefore the printed circuit board cannot be arranged horizontally.

The present invention has been made to solve the above-mentioned difficulties. Guide holes for drilling mounting holes can be quickly, accurately, and easily drilled at predetermined positions on various printed circuit boards, thereby improving work efficiency and reducing yield. To provide a guide hole drilling device for a printed circuit board, which can improve the performance of the guide holes and perform highly accurate drilling work without requiring a high degree of skill.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, the printed circuit board guide hole punching device according to the present invention includes a printed circuit board 10 (second
, 3, and 5) on which is placed, and a pair of parallel frames 14 supported so as to be vertically movable with respect to the base.

Necessary circuit pattern 16 on printed circuit board 10
(FIG. 2) is formed, and a mounting hole drilling portion 18 in which copper foil remains is provided for drilling a mounting hole for mounting an element. The mount hole is formed by press punching the mount hole perforation portion into a convex shape and a concave shape. The apparatus of the present invention has a predetermined guide hole 20 for positioning the substrate in the press die when performing the press operation.
(Fig. 3) and its guide hole perforation part 22 (Fig. 5)
It is to be drilled in the For press punching, prepare a convex mold (upper mold) and a concave mold (lower mold) corresponding to the mount hole punching part 18, and
By protruding a guide pin corresponding to 0 on the lower die of the press and fitting the guide hole 20 to this guide pin, the die and the mount hole perforation 18 are aligned, and the upper die and the lower die are connected. and drill the mounting hole.

Secured to the base 12 in the illustrated embodiment are four fluid motors (not shown) in which pistons 24 extend perpendicularly from the cylinder flange 26 and are attached to the frame 14. When the fluid motor is energized or deenergized, the piston 24 moves up and down, and the frame 14 moves up and down while maintaining a horizontal state.

A board 28 made of, for example, phenol resin is secured to the upper surface of the base 12 and is supported horizontally by a horizontal member (not shown). A large number of through holes 32 are bored in the board 28 (Fig. 3),
A chamber 34 located on the underside of the board 28 is connected via a pipe 36 to a blower (not shown). In this way, the printed circuit board 10 is placed on the board 28, and the through hole 32 drilled in the board is inserted.
By sucking the printed circuit board downward with a vacuum through the holder, bending or warping of the printed circuit board can be prevented, and the printed circuit board can be arranged horizontally.

This device is equipped with positioning means 40 for positioning the printed circuit board 10 on the base 12.

In the embodiment shown in FIG.
0 has an air motor 46 consisting of a cylinder 42 and a piston 44. Piston 44 is link 4
6', it is pivotally connected to an eccentric pin 52 of a rotatable shaft 50 in the bearing pipe 48. The bearing pipe 48 and cylinder 42 are fixed to the base 12 by a bracket 54. From the axis 50, the arm 5
6 protrudes, and a knife edge 58 is attached to its tip. Further, a tension spring 51 is hung between a pin 49 and a bracket 54, which are bored on the outer periphery of the pipe 48. In order to fix the printed circuit board 10 using the knife edge 58, it is preferable to form the positioning pattern 60 when forming the predetermined circuit pattern 16 of copper foil on the printed circuit board 10. As shown in FIG. 2b, this pattern 60 consists of side parts 62a, 62b where copper foil exists and a passage 64 without copper foil formed between them. is formed into a wedge shape. Therefore, knife edge 58
is positioned in the passage 64 and the printed circuit board is pushed in the direction of the arrow 66, the tip of the knife edge 58 is guided by the wedge-shaped portion and finally stops at the intersection point 68, and the printed circuit board 10 is pushed into the base 1.
2 is placed in place.

Alternatively, instead of providing such a pattern 60, an index is formed in advance at the location to be positioned, and the knife edge 58 is placed on this index.
The printed circuit board may be fixed by bringing them into contact with each other.

On the frame 14, there are
A moving bar 70 is mounted which can be coarsely adjusted in movement in one of the directions (lateral direction X in the illustrated embodiment). Each frame 14 has a rack 72 and a deformed dovetail groove 74 formed in its longitudinal direction.
On the other hand, the moving bar 70 has the rack 7 on the frame.
A pinion 76 (FIG. 4) meshing with the frame 2 and a slider (not shown) correspondingly engaging the dovetail groove 74 of the frame are formed. Therefore, when the knob 78 is rotated, the moving bar 70 always maintains a state perpendicular to the frame 14 and spirals in the vertical direction X. The knob 80 is screwed onto the end of the moving bar 70 so as to come into contact with the upper surface of the frame 14, and by screwing the knob, the dovetail groove 74 and the corresponding slider are engaged with each other. The movable bar 70 is fixed to the frame.

The moving bar 70 has a plurality of brackets 84 that are movable in the vertical direction X and the horizontal direction Y for fine adjustment.
(Fig. 1, Fig. 6) are individually attached.
As shown in FIG. 7, the bracket 84 is attached to the bridge member 9.
It is attached to the moving bar 70 via 8. A dovetail groove 100 is provided in the bridge member 98 in the lateral direction Y, and the dovetail groove 100 is fitted with a corresponding protrusion 102 of the moving bar to slide thereon. A rack 104 is formed on the lower surface of the protrusion 102 and meshes with a pinion 108 provided on the bridge member 98 and rotated by a knob 106. The pinion rack may be of the type with a spur gear and corresponding teeth extending in the longitudinal direction X, but it may also be of the type with a helical gear and corresponding teeth.

Furthermore, a dovetail groove 110 is provided in the bridge member 98 in the vertical direction X, and the corresponding protrusion 11 of the bracket 84
2 and slides. A screw 116 rotated by a knob 114 is attached to the bracket 84 and is connected to the bridge member 9.
A screw hole 118 is formed through the hole 8 and screwed into the hole 118 . Although the screw 116 can freely rotate relative to the bridge member, it is stopped by a stopper means (not shown) so that it does not move in the vertical direction X relative to the bridge member.

In this way, when the knob 106 is turned, the bridge member moves and the bracket 84 slides in the horizontal direction Y for fine adjustment.When the knob 114 is turned, the bracket moves and the bracket 84 is moved in the vertical direction After the drill 86 is adjusted in both the X and Y directions so that the drill 86 is centered on the guide hole drilling section 22, the bridge member and the bracket are locked by a locking means (not shown). Preferably, it is fixed.

An electric drill 86 for drilling the guide hole 20 can be detachably attached to each bracket 84. For this purpose, a hole 88 is bored in the bracket, and a cut 8 is made to reduce the diameter of this hole 88.
9 is provided. On the other hand, the support part 90 of the drill
is approximately equal to the inner diameter of the hole 88, and after fitting the support part of the drill into the hole 88, screw the screws 91 that are engaged with both ends of the slit into the drill 8.
6 to the bracket 84.

Furthermore, a magnifying glass 92 (FIG. 5) can be removably mounted on each bracket so that the drill 86 can be removed and the center of the drill can be aligned with the center of the guide hole punching section 22 and therefore the center of the guide hole 20. That is, Loupe 9
2 has an outer diameter equal to that of the hole 88 of the bracket 84, and a transparent plate 94 with, for example, a + mark for centering is attached therein.

The operator 96 places the magnifying glass 92 on the bracket 84, looks through it from above, and drills the center of the mark on the transparent plate 94 and the guide hole 2.
If the bracket 84 is moved so that the centers of the holes 2 and 2 coincide with each other, when the drill 86 is attached instead of the loupe 92, the center of the drill bit 98' and the center of the guide hole punching part 22 will be aligned. A desired guide hole 20 will be drilled.

In FIG. 1, 37a to 37c are switches such as a fluid motor, an air motor, an electric drill, a vacuum source, and a power source, and 37d is a counter.

In using the apparatus described above, the fluid motor is energized to raise the frame 14, and the air motor 46 of the positioning means 40 is energized to rotate the arm 56 to the state shown by the dotted line in FIG. Let it move. After operating the blower, remove printed circuit board 1.
0 is placed on the board 28 of the base 12, and the air motor 46 is deenergized, the piston 44 is retracted by the elasticity of the spring 51, the arm 56 becomes the state shown by the solid line in FIG.
The printed circuit board 10 is placed in the passage 64 of
By pushing in the direction of arrow 66, the printed circuit board is fixed on the base 12. 60 patterns like this
When the printed circuit board is not in use, the printed circuit board is fixed by bringing the knife edge 58 into contact with a mark previously formed at the location to be positioned.

Next, after rotating the knob 78 and roughly adjusting the position so that the bracket 84 of the moving bar 70 approaches the guide hole drilling section 22 to be drilled, the knob 8 is rotated.
0, the moving bar 70 is fixed to the frame 14.

Then, attach the magnifying glass 92 to the bracket 84, and when looking from above, align the center of the mark on the transparent plate 94 with the center of the guide hole perforation 22.
The knob allows fine adjustment of the position of the bracket 84 in the vertical and lateral directions. Next, when the two match, the magnifying glass is removed, the drill 86 is attached to the bracket 84, and the screw 91 is screwed in to fix the drill to the bracket.

After aligning the drills in accordance with the guide hole drilling portions 22 on the printed circuit board through the above operations, the fluid motor is deenergized and the frame 14 is lowered while rotating the drill bit 98'. , a desired centered guide hole 20 is bored in the guide hole drilling portion (FIG. 3). For the same type of printed circuit board, each drill is already centered on its respective guide hole drilling portion, so all that is required is to take the printed circuit board in and out, position the printed circuit board using the positioning means 40, and move the frame 14 up and down.
Guide holes can be drilled into a large number of printed circuit boards.

Note that if the distance between the center of the drill bit and the center of the adjacent drill bit is shorter than the distance between the center of the guide hole hole and the center of the guide hole hole closest to it, Since it is not possible to drill these holes, it is better to prepare two devices or to perform the work twice with one device.

As is clear from the above embodiments, according to the present invention, the frame that moves up and down with respect to the base has one
A moving bar that can be roughly adjusted in two directions is provided,
A plurality of brackets that can be finely adjusted in the vertical and horizontal directions are individually attached to this bar, and each bracket has a drill and a center point between the drill and the guide hole drilling part of the printed circuit board fixed on the base. By making it possible to selectively and removably attach a magnifying glass to obtain the desired results, it is now possible to center the drill with the predetermined guide hole drilling portion of various printed circuit boards, allowing for extremely accurate, quick and easy guidance. Holes can be drilled. As a result, workability has been significantly improved, yields have been improved, and highly accurate drilling work can be performed without the need for a high level of skill. It is extremely large. Also,
By providing a board that is fixed to the top surface of the base and has a large number of through holes, and by providing a chamber located below this board and connected to a blower, it is possible to prevent the printed circuit board from bending or warping. ,
Therefore, the printed circuit board can be arranged horizontally.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a guide hole punching device for a printed circuit board according to the present invention, FIG. Figure b is an explanatory diagram showing the pattern used for positioning, Figure 3 is an explanatory diagram showing the relationship between the base board, the printed circuit board placed on it, and the drill, and Figure 4 is an explanatory diagram showing the relationship between the base board and the printed circuit board placed on it, and the drill. FIG. 5 is an explanatory diagram showing the relationship between the frame and the moving bar used; FIG. 5 is an explanatory diagram showing the relationship between the magnifying glass mounted on the bracket used in the apparatus shown in FIG. 1 and the guide hole punching portion of the printed circuit board; Fig. 6 is an explanatory diagram showing the motor attached to the bracket used in the device shown in Fig. 1 and the fine adjustment part of the bracket, Fig. 7 is a partial perspective view showing the fine adjustment part, and Fig. 8 is a fine adjustment part. FIG. 10...Printed circuit board, 12...base, 14...
... Frame, 20 ... Guide hole, 22 ... Guide hole perforation part, 28 ... Board, 32 ... Through hole, 3
4...Chamber, 40...Positioning means, 70
...Movement bar, 84...Bracket, 86...Drill, 92...Magnifying glass, X...Vertical direction, Y...Horizontal direction.

Claims (1)

[Claims] 1. A base on which a printed circuit board is placed, which has a guide hole perforation section in which a predetermined guide hole is perforated, a board that is fixed to the upper surface of the base and has a large number of through holes, and a lower side of the board. a chamber located at and connected to the blower; a positioning means for positioning the printed circuit board on the base; a frame supported vertically and horizontally on the base; a movable bar that is coarsely adjustable in one of the directions; and a plurality of brackets that are individually attached to the bar and movable in a finely adjustable manner in the vertical and horizontal directions, each bracket A print characterized in that a drill for drilling a guide hole is detachably mounted, and when the drill is removed, a magnifying glass that aligns the center of the drill with the center of the guide hole can be detachably mounted. Board guide hole punching device.