JPH07326505A - Breaking device of ceramic material board for electronic component - Google Patents

Abstract

PURPOSE:To decrease breaking of stick formed board at a mid part in short length at breaking of stick formed boards along breaking lines by feeding a ceramic material board between a small diameter roller with an elastic cover and a large diameter roller. CONSTITUTION:A large roller 12, of which length is shorter than the width of a ceramic material board A, is positioned at approximately the middle of the ceramic board A in the direction of width and the outer surface of the elastic plate 12a on the outer surface of the large roller 12 is formed center high like a barrel surface 12a'.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for breaking a ceramic material substrate for each chip substrate in the electronic component when manufacturing an electronic component such as a chip resistor.

[0002]

2. Description of the Related Art Generally, when manufacturing a chip resistor, as shown in FIG.
And a break line A2 in the lateral direction are engraved in a grid pattern, and a ceramic material substrate A is used.
After forming a resistance film on the surface of the ceramic material substrate A, the ceramic material substrate A is broken into rod-shaped substrate pieces A3 along break lines A1 in the respective vertical directions, and then the rod-shaped substrate pieces A3 are broken.
After the side surface terminal electrode film A4 is formed on both the left and right long side surfaces A3 ', A3 ", the rod-shaped substrate piece A3 is attached to each chip resistor A5 along each horizontal break line A2.
The manufacturing method of breaking each is adopted.

When the ceramic material substrate A is broken into the rod-shaped substrate pieces A3 along the break lines A1 in the vertical direction as described above, Japanese Patent Laid-Open No. 60-23014 discloses a prior art. , A break device as shown in FIGS. 7 to 9 is proposed. That is, the breaking device in this prior art is provided with an upper portion of the drive rotation type small diameter roller 1 in which an elastic plate 1a such as urethane is stretched on the outer peripheral surface,
The large-diameter roller 2 having the same length as the small-diameter roller 1 and having an elastic plate 2a made of urethane or the like stretched on the outer peripheral surface is arranged in parallel, while the small-diameter roller 1 and the small-diameter roller 1 are arranged in parallel. The pair of left and right endless belts 4 and 5 is wound around the guide roller 3, and the ceramic material substrate A is interposed between the small diameter roller 1 and the large diameter roller 2.
By sending a break line A2 in the vertical direction on the ceramic material substrate A in parallel with the axes of the rollers 1 and 2 and pinching the break lines A2 along the break lines A1 in the vertical direction. After breaking the bar-shaped substrate piece A3, the broken bar-shaped substrate piece A3 is sent while being placed on the upper surfaces of both endless belts 4 and 5.

[0004]

SUMMARY OF THE INVENTION In the breaking device of this prior art, all of the broken bar-shaped substrate pieces A3 that are broken at the break line A2 in the lateral direction and shortened in length are endless. Belt 4, 5
A bar-shaped substrate piece A that has fallen from the ground and has been broken to its full length
Although only 3 is lined up on the upper surfaces of both endless belts 4 and 5, there is an advantage that it can be sent to the next step, but on the other hand, there is a problem as described below.

That is, in the breaker according to this prior art, the ceramic material substrate A is sandwiched between the rollers 1 and 2 having the same length. , 2
Is in a state of line contact over the entire ceramic material substrate A, and the sandwiching force by both rollers acts on the entire width direction of the ceramic material substrate A. When the break line A1 in the vertical direction of the ceramic material substrate A is fed between the rollers 1 and 2 so as to be correctly parallel to the axes of the rollers 1 and 2, the rod-shaped substrate piece A having the full length is formed.
3 and the break surface along the break line in the vertical direction can be made substantially perpendicular to the expression on the rod-shaped substrate piece A3.

However, if the break line A1 in the vertical direction of the ceramic material substrate A is slightly inclined with respect to the axes of the rollers 1 and 2, the rod-shaped substrate piece A3 is laterally extended in the lengthwise direction. The breakable line A2 is broken at the location of the broken line A2, and when a chip or the like is caught between the ceramic material substrate A and the small-diameter roller 1, the rod-shaped substrate piece A3 has a length direction. Since it will be broken at the location of the break line A2 in the horizontal direction in the middle of, there is a low probability of breaking into the rod-shaped substrate piece A3 having the full length, and many rod-shaped substrate pieces shorter than the predetermined length are generated. There was a problem that the rod-shaped substrate with a short length had to be discarded.

According to the present invention, when a ceramic material substrate having a vertical break line and a horizontal break line engraved is broken into a rod-shaped substrate piece along the vertical direction, the ceramic material substrate is broken along the vertical break line. Under the condition that the broken fractured surface is almost perpendicular to the surface of the rod-shaped substrate piece,
It is a technical subject to improve the probability of breaking a rod-shaped substrate piece having a full length.

[0008]

In order to achieve this technical object, the present invention provides a "large-scaled elastic plate stretched on the outer peripheral surface above the driving rotary small-diameter roller having the elastic plate stretched on the outer peripheral surface. The diameter roller is arranged in parallel so as to sandwich the ceramic material substrate between the large diameter roller and the small diameter roller, and at least the left and right sides are arranged between the small diameter roller and the guide roller arranged in parallel with the small diameter roller. In a breaking device formed by winding a pair of endless belts, the large-diameter roller is
The length dimension thereof is shorter than the width dimension of the ceramic material substrate, and the ceramic material substrate is positioned at a substantially central portion in the width direction, and further, the outer peripheral surface of the elastic plate on the outer peripheral surface of the large diameter roller, Form on the middle and high drum surface. "."

[0009]

[Operation] In such a structure, by feeding the ceramic material plate between both rollers, the ceramic material substrate becomes a break line in the vertical direction due to the difference in the curvature radii at the clamping portions of the both rollers. It breaks along the rod-shaped substrate piece. Among the bar-shaped substrate pieces thus broken, the one that is not folded in the middle, that is, the bar-shaped substrate piece that has the full length is left on the upper surface of the pair of left and right endless belts. On the other hand, when it is sent out, when it is broken, it is broken on the way, that is, a bar-shaped substrate piece shorter than a predetermined length falls from the upper surfaces of the pair of left and right endless belts.

In this case, according to the present invention, the large-diameter roller in the upper portion is located at a substantially central portion in the width direction of the ceramic material substrate with its length dimension shorter than the width dimension of the ceramic material substrate. Further, by forming the outer peripheral surface of the elastic plate on the outer peripheral surface of the large-diameter roller into a medium-high drum surface, the contact of the large-diameter roller with the ceramic material substrate becomes a substantially point contact state. Since the clamping force can be concentrated and applied to the substantially central portion in the width direction of the ceramic material substrate, when the ceramic material substrate is fed between both rollers, the vertical direction of the ceramic material substrate is increased. If the break line is slightly inclined with respect to the axes of both rollers, or if cracks or the like are caught between the ceramic material substrate and the small diameter roller. In this case, the bar-shaped substrate piece that is broken along the break line in the vertical direction can be reliably reduced from breaking along the break line in the horizontal direction in the middle of the longitudinal direction thereof, as compared with the conventional case described above. Of.

Moreover, since the pressing force by both rollers can be concentrated and acted on the substantially central portion in the width direction of the ceramic material substrate, each rod-shaped substrate piece broken along the break line in the vertical direction. It is possible to make sure that the fracture surface at is almost at a right angle to the surface of the rod-shaped substrate piece.

[0012]

As described above, according to the present invention, when the ceramic material substrate is broken into the rod-shaped substrate pieces along the break lines in the vertical direction, the fracture surface of each rod-shaped substrate piece is surely secured to the surface thereof. Since it is possible to surely reduce the breakage into a short length in the middle under the condition of being substantially right angle, there is an effect that the probability of being able to break the length to a complete length and, consequently, the yield rate can be greatly improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings of FIGS. In this figure, reference numeral 11 indicates a small-diameter roller arranged in a substantially horizontal direction.
1 is rotationally driven in the direction of the arrow by a drive mechanism (not shown), and has an elastic plate 11a made of urethane or the like on its outer peripheral surface.
Is stretched.

Reference numeral 13 denotes a guide roller arranged in parallel with the small diameter roller 11 at an appropriate distance, and between the guide roller 13 and the small diameter roller 11, a pair of left and right endless belts 14, Fifteen is wrapped around. The endless belts 14 and 15 are configured to fit in grooves provided on the outer peripheral surfaces of the small diameter roller 11 and the guide roller 13 so as not to project from the outer peripheral surfaces of the small diameter roller 11 and the guide roller 13. .

Reference numeral 12 denotes a large-diameter roller arranged above the small-diameter roller 11 in parallel with the small-diameter roller 11. The large-diameter roller 12 is pressed against the small-diameter roller 11 by spring means or the like (not shown). According to the large diameter roller 1
The ceramic material substrate A fed between the small-diameter roller 11 and the small-diameter roller 11 is clamped. In this case, the length of the large-diameter roller 12 is set to be shorter than the width of the ceramic material substrate A, and the large-diameter roller 12 is positioned at a substantially central portion in the width direction of the ceramic material substrate A. An elastic plate 12a made of urethane or the like is stretched on the outer peripheral surface of the radial roller 12, and the outer peripheral surface of the elastic plate 12a is formed into a medium-high drum surface 12a 'having a radius R.

In this structure, the ceramic material plate A
Is fed between the rollers 11 and 12, the ceramic material substrate A moves along the break line A1 in the vertical direction due to the difference in the curvature radii of the pressing portions of the rollers 11 and 12. A3 breaks.
Among the bar-shaped substrate pieces A3 thus broken, the one that is not folded in the middle, that is, the bar-shaped substrate piece A3 having a complete length is placed on the upper surfaces of the pair of left and right endless belts 14 and 15. While being sent out as it is, what was broken in the middle of the break, that is,
The rod-shaped substrate piece shorter than a predetermined length drops from the upper surfaces of the pair of left and right endless belts 14 and 15.

In this case, as described above, the large-diameter roller 12 in the upper portion has its length dimension shorter than the width dimension of the ceramic material substrate A, and the substantially central portion in the width direction of the ceramic material substrate A. Further, since the outer peripheral surface of the elastic plate 12a on the outer peripheral surface of the large diameter roller 12 is formed into a medium-high drum surface 12a ', the contact of the large diameter roller 12 with the ceramic material substrate A is
In a substantially point contact state, the sandwiching force by the rollers 11 and 12 can be concentrated and acted on the substantially central portion of the ceramic material substrate A in the width direction. When the ceramic material substrate A is fed between the rollers 11 and 12, the vertical break line A1 is slightly inclined with respect to the axes of the rollers 11 and 12, or When chips or the like are caught in the small-diameter roller 11, the bar-shaped substrate piece A3 that is broken along the break line A3 in the vertical direction is broken along the break line A2 in the horizontal direction in the middle of the longitudinal direction. Breaking can be reduced more reliably than in the conventional case described above.

According to an experiment conducted by the present inventor, in the case of the conventional structure, the bar-shaped substrate piece A3 which is broken along the break line A3 in the vertical direction is a break line A2 in the horizontal direction in the middle of the longitudinal direction. 50% break along
However, the rate of breaking along the break line A2 in the lateral direction can be kept to 1% or less by configuring the present invention as described above.

Further, even when the large-diameter roller 12 is located at a substantially central portion in the width direction of the ceramic material substrate A with the length thereof being shorter than the width dimension of the ceramic material substrate A, When the outer peripheral surface of the elastic plate 12a of the large-diameter roller 12 is made parallel to the axis line without forming the drum surface 12a ', the broken surface of each rod-shaped substrate piece A3 broken along the break line A1 in the vertical direction. Bending angle θ with respect to the surface of the rod-shaped substrate piece A3
Was up to 7 to 8 degrees, but when the outer peripheral surface of the elastic plate 12a of the large-diameter roller 12 is formed into a medium-high drum surface 12a 'having a radius R as in the present invention, the folding The angle θ can be set to 5 degrees or less, and each rod-shaped substrate piece A
It was possible to make the fracture surface of No. 3 nearly perpendicular to the surface of the rod-shaped substrate piece A3.

Furthermore, the outer peripheral surface of the elastic plate 12a of the large-diameter roller 12 is not limited to the middle-high drum surface 12a 'having the radius R as in the above-described embodiment, but as shown in FIG. Needless to say, it may be formed on the mountain-shaped drum surface 12a ".

[Brief description of drawings]

FIG. 1 is a perspective view of a ceramic material substrate used for manufacturing a chip resistor.

FIG. 2 is a perspective view of a breaking device according to an exemplary embodiment of the present invention.

FIG. 3 is a front view of FIG.

FIG. 4 is a sectional view taken along line IV-IV of FIG.

5 is an enlarged sectional view taken along line VV of FIG.

FIG. 6 is a diagram showing another embodiment of the large diameter roller of the present invention.

FIG. 7 is a perspective view of a conventional breaking device.

8 is a front view of FIG. 7. FIG.

9 is a sectional view taken along line IX-IX in FIG.

[Explanation of symbols]

 11 Small-diameter roller 11a Elastic plate 12 Large-diameter roller 12a Elastic plate 12a ', 12a "Drum surface 13 Guide roller 14, 15 Endless belt A Ceramic material substrate A1 Vertical break line A2 Horizontal break line A3 Rod-shaped substrate piece

Claims (1)

[Claims] 1. A ceramic material substrate comprising a large diameter roller having an outer peripheral surface provided with an elastic plate, and a large diameter roller having an outer peripheral surface provided with an elastic plate. In the break device, at least a pair of left and right endless belts are wound between the small-diameter roller and a guide roller arranged in parallel with the large-diameter The roller has a length dimension shorter than the width dimension of the ceramic material substrate and is positioned at a substantially central portion in the width direction of the ceramic material substrate. Further, the outer periphery of the elastic plate on the outer peripheral surface of the large diameter roller. A breaker for a ceramic material substrate for electronic parts, characterized in that the surface is formed as a medium-high drum surface.