JPH11261200A - Pattern cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pattern cutter with which a pattern can be easily cut, without requiring skills. SOLUTION: A transparent conical dust cover 6A is provided at the end of a chuck 2 at the end of a drill body 1 via a coil spring 8 and its upper portion is supported on the shaft portion 3a of a cutter grinder 3, with a pin 25 inserted in a boss 6a located at the inner top portion of the dust cover 6A. Four supports 9A are provided in a cross shape at an intermediate portion on the inner wall of the dust cover 6A, and a sliding ring 10 is provided on the insides of those supports 9A. The shaft portion 3a of the cutter grinder 3 is put through the sliding ring 10, above which a stopper 21 is provided. Four aiming rods 7 are provided at the lower end of the dust cover 6A, and a guide ring 7a in which the grinder 3b is fitted freely is provided on the insides of the aiming rods 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pattern cutter for partially removing a pattern printed on a printed circuit board.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view showing an example of a conventional pattern cutter and the usage of the pattern cutter, and shows an example in which the pattern cutter is used for a conductor pattern formed on a printed circuit board.
In FIG. 7, a chuck 2 is provided at the lower end of the drill body 1, and the chuck 2 has a shaft 3 of a cutter grindstone 3.
The upper part of a is inserted and supported. A grindstone 3b is fixed to the lower end of the cutter grindstone 3.

[0003] A dry battery (not shown) is housed in the upper part of the drill body 1, and a drive unit for driving the shaft 3 a of the cutter grindstone 3 is housed below the dry battery. A switch (not shown) for turning on and off the driving unit is attached to a side surface of the drill body 1.

[0004] The pattern cutter is used, for example, when a part of a conductor pattern 5 applied to a printed board 4 is cut due to a change in specifications of a device into which the printed board 4 is incorporated.

In this case, the upper part of the drill body 1 is gripped, the switch is turned on, and the grindstone 3b at the lower end is connected to the conductor pattern 5.
And the pattern 5 is partially scraped off.

FIG. 8 shows an example of a pattern cutter different from that shown in FIG. 7, in which a steel rod 12 is embedded in advance in the axis of a grip 11 made of resin, and a blade 12a is brazed to the tip of the steel rod 12. . In this pattern cutter, the tip of the blade 12a is pressed against the conductor pattern and cut, and then the portion to be cut is peeled off.

[0007]

[Problems to be solved by the invention]
In the pattern cutter shown in FIG. 7, the shaft portion 3 is formed by the reaction force of the grindstone pressed against the conductor pattern 5 while rotating.
Not only is there a risk that the position of the tip of “a” will shift, but if the grinding stone 3b contacts an adjacent pattern, this pattern may also be scraped off.

For this reason, a method of reducing the reaction force of the grindstone by reducing the force of pressing the grindstone against the pattern to prevent displacement is conceivable. However, the time required for cutting the pattern becomes longer, and the efficiency is reduced. Therefore, labor and skill are required to correct a mass-produced printed circuit board with an appropriate pressing force. Further, when the cut portion is covered with the powder of the pattern scattered by the grindstone, the position to be cut cannot be seen, so that the work efficiency may be reduced.

On the other hand, in the pattern cutter shown in FIG.
An increase in the number of printed circuit boards causes fatigue, which may damage adjacent patterns, and this pattern cutter also requires skill. Therefore, an object of the present invention is to provide a pattern cutter which does not require any skill and can easily cut a pattern.

[0010]

According to a first aspect of the present invention, there is provided a pattern cutter for guiding an axis of a cutter grindstone to one side of a drill in which a driving unit for driving a cutter grindstone protruding from one side is incorporated. A transparent cover provided with a guide portion is provided, and an aiming portion is provided, in which a cutter grindstone protruding from a tip of the transparent cover by a pressing operation of a drill is loosely fitted to a fitting portion.

In the pattern cutter according to the present invention, an intermediate portion is supported by the guide portion, one end is pivotally supported on one side of the transparent cover, and the other end is formed on the other side of the transparent cover. An operating rod protruding from the window is provided.

The pattern cutter according to the third aspect of the present invention has an elasticity that is compressed by a drill pressing operation between one side of the drill and the base end of the transparent cover or against the tip of the transparent cover. It is characterized by having a body.

[0013] The pattern cutter of the invention according to claim 4 is characterized in that a magnifying mirror for magnifying and visually recognizing a grindstone loosely fitted to the fitting portion is provided through the transparent cover. Also,
In particular, a pattern cutter according to a fifth aspect of the present invention is characterized in that a disk-shaped cutter that is driven to rotate by the rotation of the axis of the grindstone is provided at the tip of the grindstone.

Furthermore, the pattern cutter of the invention according to claim 6 is characterized in that the front end face of the transparent cover is inclined with respect to a plane orthogonal to the axis of the grindstone. In the invention corresponding to claim 1, one side of the drill pressed against the printed board is held by the transparent cover by such means, and the cutter grindstone is positioned by the aiming portion.

[0015] In the invention corresponding to claim 2 in particular,
The pressing force and the pressing position of the grindstone pressed by the pattern are finely adjusted by the operation rod, and in particular, in the invention corresponding to claim 3,
The elastic body is bent by the pressing force of the drill, and the grindstone is pressed against the portion to be cut.

[0016] In the invention corresponding to claim 4,
6. The visibility of the portion to be resected is increased by a magnifying glass.
In the invention corresponding to (1), the portion to be cut is cut along the disk-shaped outer periphery. In particular, in the invention corresponding to claim 6, the restriction on the angle at which the portion to be cut is seen is reduced, and the visibility of the portion to be cut is increased.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the pattern cutter according to the present invention will be described below with reference to the drawings. FIG. 1 (a)
FIG. 8 is a perspective view showing a first embodiment of a pattern cutter according to the present invention, and is a view corresponding to FIG. 7 shown in the related art. FIG. 1C is an enlarged vertical sectional view of a portion A in FIG. 1A.

FIGS. 1A and 1C are different from FIG. 7 shown in the prior art in that a cutter grindstone holding mechanism constituted by a dust cover 6 described below is provided on the lower end of the chuck 2. That is the provision.

That is, a coil spring 8 is previously loosely fitted to the lower end surface of the chuck 2 of the cutter 1 from below via a spring receiver 8a shown in FIG.
A spring receiver 8a is loosely fitted to the lower end of the spring.

The upper end of a transparent acrylic resin dust cover 6 having a trapezoidal vertical section is inserted into the lower surface of the lower spring receiver 8a. This dust cover 6
The narrow groove (not shown) formed at the lower end of the
26 is inserted and fixed with adhesive. Dust cover 6
Is supported by the shaft 3a of the cutter grindstone 3 by a pin 25 inserted through a boss 6a joined to the lower surface of the upper end as shown in FIG. 1 (c). As a result, the coil spring 8 is slightly compressed.

An annular stopper 21 is provided at an intermediate portion of the shaft portion 3a.
The stopper 21 is fixed to the shaft portion 3a by a set screw 22 screwed to a side surface of the stopper 21. A sliding ring having the same shape as the stopper 21 is provided below the stopper 21.
10 is inserted, and the outside of this sliding ring 10 is radially 90 °.
One side of the support 9 arranged at intervals is joined, and this support 9
The other side is joined to the inner periphery of the dust cover 6 described above.

On the inner periphery of the lower end of the dust cover 6, a thin 4
One side of the sighting rod 7 is fixed at 90 ° intervals, and the other side of the sighting rod 7 is joined to the outer circumference of a guide ring 7a whose inner diameter is slightly larger than the outer diameter of the grindstone 3b.

When the operator partially cuts the pattern formed on the printed circuit board with such a pattern cutter, a pair of aiming rods 7 on the same straight line among the aiming rods 7 at the lower end of the dust cover 6 are used. The lower end of the dust cover 6 is placed on the printed circuit board 6 such that the cut portion comes on the line connecting the 7 and the line is orthogonal to the pattern. In this state, by moving the pair of sighting rods 7 on the other side so as to overlap the center of the pattern, the center of the guide ring 7a is positioned in accordance with the center position of the cutout.

Next, the drill body 1 is gripped, the switch is turned on, the switch is pressed down, the coil spring 8 is compressed, and the lower surface of the stopper 21 is brought into contact with the slide ring 10 to lower the grindstone 3b inside the guide ring 7a. To perform a pattern cutting operation.

In the pattern cutter constructed as described above, the positioning of the grindstone 3b with respect to the cut portion is not only facilitated by the aiming rod 7 and the guide ring 7a at the lower end of the dust cover 6, but also after the positioning, The rubber 26 at the lower end of 6 can also prevent displacement and damage to adjacent patterns caused by the displacement.

Therefore, during the cutting operation, only the pressing force needs to be paid attention, so that the operation becomes easy, and there is no possibility that the grinding wheel 7a swings by the guide ring 7a. Can be.

FIG. 1B is a perspective view showing a second embodiment of the pattern cutter of the present invention, and corresponds to FIG. 1A shown in the first embodiment. FIG. 1 (b)
In FIG. 1, the first embodiment shown in FIG.
The difference from (a) and (c) is the shape of the sliding ring and the guide ring, and the other points are the same as in FIGS. 1 (a) and (c). Therefore, the same portions as those in FIGS. 1A and 1C are denoted by the same reference numerals and description thereof will be omitted.

That is, the sliding ring 23 shown in FIG.
As shown in FIG. 1 (d) showing an enlarged view of the sliding ring 23, a convex portion 23 a is formed at an upper end of a center portion in a substantially arrow shape,
When viewed from above, a narrow oval hole 23b is formed in the front-rear direction. Similarly, the guide tube 7b is also formed in an oblong shape in which the front-back direction is narrow and the left-right direction is long.

The pattern cutter having the sliding ring 23 and the guide ring 7b is applied to the case where a wide pattern formed in the front-rear direction in FIG. 1B is partially cut.

That is, by gripping the drill body 1 and swinging the drill body 1 in the left-right direction in FIG. 1B, the shaft portion 3a of the cutter grindstone 3 is moved through the oblong hole of the sliding ring 23. And press to cut the pattern in a narrow width.

Also in this case, the method of positioning the dust cover 6 is the same as that shown in FIG. 1A shown in the first embodiment, but the pressing force is slightly reduced as it moves to both sides in the width direction of the pattern. To increase.

FIG. 2 is a perspective view showing a third embodiment of the pattern cutter of the present invention, and is a view corresponding to FIGS. 1A and 1B shown in the above-described embodiment, and FIG. FIG. 4 is an enlarged right side view of a portion B of FIG.

FIGS. 2 and 3 are different from FIGS. 1 (b) and 1 (d) shown in the above-described embodiment in that the structure for supporting the cutter grindstone 3 on the chuck 2 and the structure for swinging the cutter grindstone 3 are described. And the structure of the dust cover. That is, the cutter grindstone 3 shown in FIG.
The upper end of the connecting shaft 16A is supported by the chuck 2.

A square hole 6a shown in the enlarged view of FIG. 3 is formed on the right side of the intermediate portion in FIG. 3 of the dust cover 6B, and an L-shape is formed on the left side of the dust cover 6B in a plan view (not shown). One side of the support is bonded with an adhesive.

One end of a support pin 14 is fixed to the other side of the support, and the left end of the operating rod 9C is swingably connected to the other side of the support pin 14 via a rod end bearing (not shown). ing.

The right end of the operating rod 9C is connected to the dust cover 6
B penetrates a square hole 6a formed on the right side of B. An intermediate portion of the operation rod 9C is fixed to a side surface of the sliding ring 10, and a knob 13 is screwed to a right end of the operation rod 9C and fixed with a double nut.

In the pattern cutter constructed as described above, when the cover 6B is positioned, for example, the drill body 1 is held with the left hand, and the knob 13 is moved with the right hand forward and backward as indicated by an arrow C1, as indicated by an arrow C2. By operating vertically, the position of the pattern removal target portion and the pressing force of the grindstone 3b can be simultaneously controlled. Therefore, there is an advantage suitable for a pattern requiring fine removal work.

FIG. 4 shows a fourth embodiment of the pattern cutter according to the present invention corresponding to FIGS. 1A, 1B and 2 described above, and corresponds to claim 6. FIG. 4 differs from FIG. 1A shown in the first embodiment in the shape of the lower end of the dust cover.
This is the same as (a) and (c). That is, the dust cover 6C is formed so that the lower end surface thereof is not perpendicular to the axis of the shaft portion 3a of the cutter grindstone 3, but is inclined at, for example, 45 ° C.

In this case, not only is the holding of the drill body 1 easy, but also the position of the grindstone 3b is adjusted with the dust cover 6C.
Can be seen from the orthogonal direction of the lower part, so that the positioning work can be further facilitated, and the contact state of the cutter with the pattern of the grindstone can be seen more clearly, so that a finer removing work can be performed.

FIG. 5 is a partial perspective view showing a fifth embodiment of the pattern cutter according to the present invention, which corresponds to claim 5 and differs from the above-described embodiment in that a disk-shaped rotating member is used instead of a grindstone. Therefore, the drive transmission mechanism of this cutter is also different.

That is, the dust cover 6D shown in FIG.
An upper end of an annular cushion seat 18 made of a chloroprene rubber foam material is joined to the lower end of the base with an adhesive. Inside the aiming rod 7 whose outer end is supported at the upper end of the cushion seat 18, a hexagonal guide in which the interval between one set of two parallel sides is narrowed out of three sets of two parallel sides is provided. The ring 7d is fixed.

On the other hand, the connecting shaft 16B suspended from the chuck 2
Has a lower end which penetrates an upper end of a gear box 17 whose left and right are supported by left and right supports 9D, and a bevel gear (not shown) is fixed to the lower end.

The gear box 17 accommodates a bevel gear (not shown) that meshes with a bevel gear fixed to the connection shaft 16B. A disk-shaped cutter 19 is press-fitted into the portion via a key (not shown).

In the pattern cutter configured as described above, after positioning the dust cover 6D, the cushion body 18 is bent by pushing the drill body downward, thereby bringing the cutter 19 into contact with the pattern.

In this case, the cushion seat 18 is
The coil spring 8 is used instead of the coil spring 8 shown in FIGS. This pattern cutter can also be used for cutting a printed circuit board itself.

FIG. 6 is a perspective view showing a pattern cutter according to a sixth embodiment of the present invention, and corresponds to claim 4. In FIG. 6, FIG. 1A shown in the first embodiment
The difference from this is that a magnifying glass 27 is inserted into the dust cover 6E via a substantially convex presser 27a.
Is set at the center of the guide ring 7a.

A suction nozzle 24 extends through the dust cover 6E from the right side.
a to the right of a. The right end of this suction nozzle 24
Connected to the factory vacuum pump.

In this case, it is possible to cope with a fine pattern. By sucking the cutting powder by the grindstone with the suction nozzle 24, the visibility can be prevented from lowering and the work efficiency can be improved.

[0049]

As described above, according to the invention corresponding to the first aspect, the guide portion for guiding the axis of the cutter grindstone is provided to one side of the drill in which the driving portion for driving the cutter grindstone protruding from one side is incorporated. A transparent cover is provided, and a cutter whetstone protruding by the pressing operation of the drill against the tip of the transparent cover is provided with an aiming portion for loosely fitting into the fitting portion, so that one side of the drill pressing on the printed circuit board is covered with the transparent cover. In addition, since the cutter grindstone is positioned by the aiming unit, it is possible to obtain a pattern cutter that does not require skill and that can easily cut the pattern.

Further, according to the invention corresponding to claim 2, the intermediate portion is supported by the guide portion, one end is pivotally supported on one side of the transparent cover, and the other end is formed on the other side of the transparent cover. By providing an operating rod protruding from the part, the pressing force and pressing position of the grindstone pressed by the pattern can be finely adjusted by the operating rod, so a pattern cutter that does not require skill and can easily cut off the pattern Obtainable.

Further, according to the invention corresponding to claim 3, an elastic body which is compressed by a pressing operation of the drill is provided between one side of the drill and the base end of the transparent cover or at the tip of the transparent cover. Then, bend the elastic body with the pressing force of the drill,
Since the grindstone is pressed against the portion to be cut, a pattern cutter which does not require skill and can easily cut the pattern can be obtained.

In addition, according to the invention corresponding to claim 4, a magnifying mirror for magnifying and visually recognizing the grindstone loosely fitted to the fitting portion is provided through the transparent cover, so that the visibility of the portion to be cut is magnified. Therefore, it is possible to obtain a pattern cutter which does not require any skill and can easily remove the pattern.

In addition, according to the invention corresponding to claim 5, a disk-shaped cutter which is rotationally driven by the rotation of the axis of the grinding stone is provided at the tip of the grinding stone, so that the object to be cut off at the disk-shaped outer periphery is provided. Since the part is cut, a pattern cutter which does not require skill and can easily cut off the pattern can be obtained.

Furthermore, according to the invention corresponding to claim 6, the tip of the transparent cover is inclined with respect to the plane perpendicular to the axis of the grindstone to reduce the restriction on the angle at which the part to be cut is viewed. As the visibility of the part to be resected was improved,
It is possible to obtain a pattern cutter that requires no skill and can easily cut off a pattern.

[Brief description of the drawings]

1A is a diagram showing a first embodiment of the pattern cutter of the present invention, FIG. 1B is a diagram showing a second embodiment of the pattern cutter of the present invention, and FIG. (A) is an enlarged vertical sectional view of a portion A, and (c) is a partially enlarged detailed view of (b).

FIG. 2 is a diagram showing a third embodiment of the pattern cutter of the present invention.

FIG. 3 is an enlarged right side detailed view of a portion B in FIG. 2;

FIG. 4 is a partial longitudinal sectional view showing a fourth embodiment of the pattern cutter of the present invention.

FIG. 5 is a partial longitudinal sectional view showing a fifth embodiment of the pattern cutter of the present invention.

FIG. 6 is a perspective view showing a pattern cutter according to a sixth embodiment of the present invention.

FIG. 7 is a diagram showing a conventional pattern cutter and an example of its use.

FIG. 8 is a diagram showing an example of a conventional pattern cutter different from FIG. 7;

[Explanation of symbols]

1. Drill body, 2. Chuck, 3. Cutter whetstone, 3a
... Shaft part, 3b ... Whetstone, 4 ... Printed circuit board, 5 ... Conductor pattern, 6A, 6B, 6C, 6D, 6E ... Dust cover,
6a: boss, 7: aiming rod, 7a, 7b, 7c: guide ring,
8 ... Coil spring, 9A, 9B, 9C, 9D ... Support, 10,
23 ... sliding ring, 11 ... grip, 12 ... blade, 13 ... knob, 14 ...
Support pin, 15: Flexible joint, 16A, 16B: Connection shaft, 17: Gear box, 18: Cushion seat, 19: Cutter, 20: Shaft, 21: Stopper, 22: Set screw, 24: Suction nozzle, 25 ... Pin, 26
... rubber, 27 ... magnifier.

Claims (6)

[Claims] A drill incorporating a drive unit for driving a cutter wheel protruding from one side; a transparent cover provided on one side of the drill and provided with a guide unit for guiding the axis of the cutter wheel; A pattern cutter provided at an end of a transparent cover, wherein the cutter whetstone protruded by the pressing operation of the drill is loosely fitted to a fitting portion. 2. An operation rod which is supported at an intermediate portion by the guide portion, has one end pivotally supported on one side of the transparent cover, and has the other end protruding from a window formed on the other side of the transparent cover. The pattern cutter according to claim 1, wherein: 3. An elastic body which is compressed by a pressing operation of the drill is provided between one side of the drill and a base end of the transparent cover or at a front end of the transparent cover. The pattern cutter according to claim 1 or 2. 4. The pattern cutter according to claim 1, wherein a magnifying mirror for visually recognizing the whetstone loosely fitted to the fitting portion is provided through the transparent cover. 5. The pattern cutter according to claim 1, wherein a disk-shaped cutter rotatably driven by rotation of a shaft of the grindstone is provided at a tip of the grindstone. 6. The pattern cutter according to claim 1, wherein a front end surface of the transparent cover is inclined with respect to a plane orthogonal to an axis of the grindstone.