JP2005066078A - Nippers - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems that, when a wire is cut with nippers in an assembling process of an electronic apparatus, falling or dispersion of cut chips in the electronic apparatus may cause malfunction and the nippers which cannot be miniaturized cannot be used for minute work. <P>SOLUTION: The nippers are integrally provided with a pair of opposed cutting blades 6 and a retaining part 5 retaining the cut chips 8 cut by the cutting blades 6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a nipper having a function of cutting a thin wire or a planar body such as a fine lead wire of an electronic device and holding the cut piece at the same time as cutting.

  Conventionally used cutting tools include a paper cutter and a cutting machine, and a hair cutter as shown in Patent Document 1. Among them, cutting tools as shown in Patent Documents 2 and 3 have been proposed as cutting tools having a function of preventing and retaining the falling and scattering of cutting pieces that occur simultaneously with cutting.

  Patent Document 2 proposes a cutting tool such as a nipper that prevents scattering of the cut pieces of the wire rod, provided with means for sandwiching the cut pieces on the blade portion. In this nipper, clamping means made of wear-resistant resin such as urethane rubber is fixed with screws to the slope of the blade portion, and while the clamping means is cutting the wire, the wire comes into contact with only the cutting blade and the wire is cut. Then, it is provided to be retracted outward from the cutting blade so that the cutting piece is clamped almost simultaneously, so that no repulsive force due to deflection of the clamping means is generated at the time of cutting, and scattering of the wire can be prevented. Yes.

Further, in Patent Document 3, a tweezer arm with a shark function is presented. For example, when pinching or cutting a fishing bait, You can work without changing the bag.
Japanese Utility Model Publication No. 6-24677 JP-A-8-117457 Registered Utility Model No. 3093092

  However, since the means shown in Patent Document 1 does not have a function of holding the cut piece, there is a problem that the cut piece falls and scatters around. For example, even when cutting the bundled wires, for example, when cutting the wires in the assembly process of the electronic device, there is a problem that if the cut pieces are dropped or scattered in the electronic device, a malfunction may be caused.

  Further, in the means shown in Patent Document 2, it is possible to prevent the cutting piece from dropping or scattering, but since the joining structure of the blade part and the clamping means is complicated, a particularly fine lead wire for electronic parts is used. It has been difficult to reduce the size of the nippers used for cutting operations such as the above and to adjust the interval between the clamping means.

  Further, in the means shown in Patent Document 3, the blade plate is fixed to face the middle part of the arm of the tweezers so as to face each other, and when the tweezers are pressed, the blade plate rubs against each other to add a cutting action as a ridge However, it is difficult to hold the cut piece simultaneously with the cutting because the function of pinching the tip of the tweezers and the function of cutting the blade plate are independent of each other.

  The nipper of the present invention is characterized in that a pair of opposed cutting blades and a holding portion for holding a cut piece cut by the cutting blade are integrally provided with each cutting blade.

  Moreover, the nipper of the present invention is characterized in that the holding part is composed of a convex part provided continuously to the cutting blade.

  Furthermore, the nipper of the present invention is characterized in that an angle formed by the at least one cutting blade and the holding portion is 80 ° to 170 °.

  Still further, the nipper of the present invention is characterized in that a flat portion is provided at the cutting edge of the at least one cutting blade.

  Furthermore, the nipper of the present invention is characterized in that each cutting edge is displaced when the cutting blades are engaged with each other.

  Furthermore, the nipper of the present invention is characterized in that the amount of deviation of the blade edge is 30 μm or less.

  Further, the nipper of the present invention is characterized in that a groove for storing the cutting edge of the other cutting blade in a non-contact manner is provided at the boundary between at least one of the cutting blades and the holding portion.

  Furthermore, the nipper of the present invention is characterized in that the cutting blade and the holding part are made of ceramics.

  Furthermore, the nipper of the present invention is characterized in that the ceramic is semiconductive.

  According to the nipper of the present invention, since a pair of opposed cutting blades and a holding portion for holding a cut piece cut by the cutting blade are provided integrally with each cutting blade, a fine linear body or planar shape is provided. An object to be cut such as a body can be cut and the resulting cut piece can be held without dropping. For example, when cutting the wiring of an electrical product, there is an effect of preventing adverse effects such as deterioration of the surrounding environment and malfunction of the electronic device due to a piece of the wiring falling around the wiring. In addition, since the cutting portion is small, even a nipper that is difficult to add by adding a separately prepared holding portion member with a screw or the like can be manufactured relatively easily.

  Further, according to the nipper of the present invention, the angle between the cutting blade and the holding portion is set to 80 ° or more, so that the cutting edge can be easily processed and a flank when the cutting edges intersect can be secured. Become. By setting the angle between the cutting blade and the holding portion to 170 ° or less, the cutting edge can be kept sharp.

  Furthermore, according to the nipper of the present invention, by making the cutting edge of at least one of the cutting blades a flat portion, it is possible to reduce the problem that the cutting edge is chipped when the ridgelines of the opposing cutting edges come into contact with each other. Furthermore, in a nipper of a type in which the edge line of the blade edge matches at the time of cutting, it is possible to reduce the burden of fine work that is assembled so that the narrow edge lines of the opposed blade edges match each other.

  Furthermore, according to the nipper of the present invention, when the cutting blades are engaged with each other, shearing force is generated on the workpiece by shifting the cutting edges, and the nippers of the type with which the cutting edges match make the material difficult to cut. Can also be applied.

  Furthermore, according to the nipper of the present invention, by setting the amount of deviation of the blade edge to 30 μm or less, the above-described shearing force can be effectively generated in the workpiece, and the cutting can be smoothly performed.

  Further, according to the nipper of the present invention, when the cutting blades are engaged with each other, in the nipper of the type in which each cutting edge is shifted, the cutting edge of the other cutting blade is not at the boundary between at least one cutting blade and the holding portion. By providing a groove that is accommodated by contact, it is possible to protect the cutting edge from the impact force that occurs when one blade edge comes into contact with the opposing clamping portion with the momentum after cutting, and to prevent the cutting edge from becoming chipped. .

  Furthermore, according to the nipper of the present invention, the cutting blade and the holding portion are made of ceramic, so that the wear resistance and chemical resistance are improved as compared with those made of metal, and the nipper is used over a long period of time. be able to. In particular, by making the ceramics semiconductive, rapid discharge of static electricity generated between the nipper and the workpiece can be prevented. For example, when cutting a lead wire of an electrical product, the adverse effect that static electricity accumulated on the cutting operator on the electronic components arranged around the cutting portion gives a sudden electric load through the cutting blade is prevented. be able to.

  Next, the best mode for carrying out the present invention will be described.

  FIG. 1 (a) shows a cross-sectional view in the length direction of the nipper of the present invention. This nipper 1 is attached to the other end side of the grip portion 2 (2a, 2b) connected on one end side. The holding part 4 (4a, 4b) which has a pair of cutting blade 6 which consists of the cutting blades 6a and 6b which oppose in order to cut | disconnect the cut material 9 is comprised, The said holding part 2 and the holding part 4 are the fixing | fixed part 3 (3a, 3b).

  The grip portion 2 is made of stainless steel, resin, ceramics, or the like, and is connected mainly by welding, adhesion, or screwing. Also, when special functions such as chemical resistance and heat resistance are required for the gripping part, zirconia, which is relatively elastic among ceramics, may be used. In that case, a cap is put on the connection part. It is fixed by the method.

  Further, the sandwiching portion 4 is made of ceramics such as alumina, zirconia, silicon carbide, silicon nitride, cermet / hard metal mainly composed of titanium carbide, titanium nitride, tungsten carbide, hardened steel, stainless steel, etc. It consists of a metal material, and selection of these materials is suitably selected according to the material to be cut. In particular, from the viewpoint of wear of the cutting edges 60a and 60b of the cutting blade 6, it is preferable to use ceramics, and it is particularly preferable to use a zirconia-based material that is relatively tough and hardly chipped among ceramics.

  And the main structure of the clamping part 4 consists of the fixed part 3 with the cutting blade 6, the holding | maintenance part 5 of the cutting piece 8, and the holding part 2, and these are integrally formed.

  Further, the cutting blade 6 provided at the tip of the sandwiching portion 4 is formed in a triangular shape, a convex shape, or the like, and is formed continuously with the holding portion 5.

  The gripping part 2 and the clamping part 4 are coupled by an adhesive, a screw, a rivet, etc. However, considering the trouble of replacing when the clamping part 4 is damaged, a coupling means that can be freely attached and detached like a screw is used. It is preferable to use it.

  And in order to cut | disconnect the to-be-cut | disconnected object 9 using the nipper 1 of this invention, as shown in FIG.1 (b), the holding parts 4a and 4b mutually hold by holding the holding part 2 and pressing it. The cutting blade 6 cuts the workpiece 9 by approaching, the cutting blade 6 coming into contact with the portion of the workpiece 9 to be cut, and further pressing the grip 2.

  Here, the nipper 1 of the present invention is characterized in that the pair of cutting blades 6 and the holding portion 5 that holds the cut piece 8 cut by the cutting blade 6 are integrally provided.

  Thus, when the workpiece 9 is cut, the cut piece 8 is supported by the holding unit 5, and the cut piece 8 is removed while the nipper 1 is pressed without being scattered even after cutting. Therefore, it is possible to effectively prevent, for example, deterioration of the surrounding environment and malfunction of the electronic device due to the electric wire cutting piece 8 dropping around the electric wire. In addition, when cutting yarn or hair, it is possible to prevent the appearance and environment from deteriorating due to them falling to the periphery.

  Moreover, by integrally forming the cutting blade 6 and the holding portion 5, it is possible to increase the cutting accuracy and the rigidity at the time of cutting, reduce the force for pressing the grip portion 2 when cutting, and repeat Even cutting work can be used without getting tired. Further, the need for troublesome screwing or the like is eliminated, the structure is simplified, a smaller nipper 1 can be provided, and the fine workpiece 9 can be cut.

  The holding portion 5 is preferably formed of a convex portion, has a sufficient area for holding the cut piece 8, and a contact surface with the cut piece 8 is a rectangle, a parallelogram, a trapezoid, a triangle, an ellipse. Since the cut piece 8 is easily scattered to the periphery when it is formed away from the cutting blade 6 and formed from an irregular shape, etc., as shown in FIG. It is preferable to become. This is because the holding portion 5 and the cutting blade 6 are close to each other, so that the outer edge of the cutting piece 8 held by the gap between the pair of cutting blades 6a and the cutting blade 6 and the holding portion 5 engaged with the cutting blade 6b. This is because the size can be determined and a large amount of nippers having the same cutting accuracy can be easily produced.

  By these, it becomes easier to hold the cutting piece 8 and the cutting blade 6 and the holding part 5 can be provided close to each other, so that the cutting piece 8 is scattered by the pressure generated when the workpiece 9 is cut. Can be prevented.

  Moreover, when the holding | maintenance part 5 is formed by the convex part, the distance at the time of engaging the cutting blade 6 shall be the range of about 60 to 100% with respect to the thickness of the to-be-cut object 9, but this value is a to-be-cut object. 9 and the amount of deformation of the sandwiching part and the gripping part are preferably taken into account for the design, and the scattering of the cut piece 8 can be reliably prevented.

  Furthermore, it is preferable that the surface of the holding portion 5 that contacts the cut piece 8 is a flat surface, in order to hold the held cut piece 8 with certainty. The plane may be a mirror surface or a rough surface, but is preferably as rough as possible in order to reliably hold the cut piece 8, and the surface roughness is particularly Ra 0.1 μm or more. It is preferable. Further, a plurality of grooves may be formed.

  Furthermore, it is preferable that an angle α formed by at least one of the cutting blades 6a and 6b and the holding portion 5 is 80 to 170 °.

  As shown in the partial perspective view of FIG. 2, the angle α indicates, for example, an angle α formed between the upper surface of the holding unit 5 and the side surface 7 of the cutting blade 6, and the angle α is set to 80 to 170 °. This is necessary to prevent the cutting blade 6 from being damaged when the opposing cutting blades 6a and 6b come into contact with each other after the workpiece 9 is cut, and to realize a frictional mechanism of the cutting blade 6 described later in detail. is there.

  This is because if the angle α is less than 80 °, it is difficult to process the cutting blades 6a and 6b. If the angle α exceeds 170 °, the blade edge angle becomes too large and the sharpness at the time of cutting deteriorates.

  Further, the angle α is more preferably 90 to 150 °, the cutting blade can be easily processed, and excellent sharpness can be secured at the time of cutting.

  Further, the effect can be exhibited if the angle α is satisfied by at least one of the cutting blades 6, but it is more preferable that both of the cutting blades 6a and 6b satisfy this range.

  Moreover, as shown in FIG. 3, it is preferable to provide the flat part 10 in the blade edge | tips 60a and 60b of at least one cutting blade 6 among the said cutting blades 6a and 6b.

  The flat portion 10 can prevent chipping even when the edge lines of the cutting edges 60a and 60b of the cutting blades 6a and 6b come into contact with each other during cutting. This is to prevent the cutting edges from coming into contact with each other with force after cutting the workpiece 9 when both the cutting edges 60a and 60b facing each other are sharpened. In particular, this method is effective when a brittle material such as ceramics is used. In addition, when the ridgeline of the blade edges 60a and 60b of the cutting blades 6a and 6b is in contact with the cutting blades 6a and 6b, it is preferable that the flat portion 10 formed on at least one of the cutting blades 6 has a width H of 10 to 50 μm. When the ridgelines of the cutting edges 60a and 60b of the cutting blades 6a and 6b are not in contact, it is most preferable that the angle formed by the flat portions 10 is 0 °.

  Moreover, the flat part 10 does not necessarily need to be symmetrical with each other. For example, the width H of one flat part 10 may be more than twice the other, and the cutting blade 6 is formed on one of the clamping parts 4. It is also possible to use only the plane 7 of the holding part 5 without using it. The flat portion 10 can be formed by lapping, grinding, or the like, but it can be said that those formed in a slightly curved shape by barrel processing are within the scope of the present invention.

  Moreover, as shown in FIG. 4, when the said cutting blade 6 mesh | engages each cutting blade 6a, 6b, it is preferable that the blade edge | tips 60a, 60b slip | deviate.

  Thereby, the cutting edges 6a and 60b of the cutting blade 6 can be protected, and even when the cutting edges 6a and 60b of the cutting blade 6 become sharp, when the cutting blades 6 come into contact with each other or after the cutting blade 6 contacts the holding part 5, the cutting edge It can prevent that 60a and 60b are partially damaged.

  FIG. 4 (a) shows that when the cutting blades 6a and 6b are matched, the cutting edge 60a of the cutting blade 6a contacts the upper surface of the holding portion 5 formed integrally with the cutting blade 6b. In this case, since the contact surfaces of the cutting blades 6a and 6b are formed perpendicular to the holding portion 5, it is possible to cut the blades 60a and 60b without damaging each other.

  4 (b) and 4 (c) are provided with a groove 30 for storing the cutting edge 6a of the cutting blade 6a in a non-contact manner at the boundary between the cutting blade 6b and the holding portion 5. After cutting, the cutting edge 60a of the cutting blade 6 enters the groove 30, so that the cutting edge 60a hits the holding portion 5 and can be prevented from being damaged.

  The groove 30 may be provided at the boundary between at least one of the cutting blades 6 and the holding portion 5, and may be provided at the boundary between the cutting blade 6 a and the holding portion 5. More preferably, the groove 30 should be on the inside of the outer blade.

  Furthermore, as shown in FIG. 5, it is preferable that the deviation 61 between the cutting edges 60a and 60b of the cutting blades 6a and 6b is 30 μm or less.

  In the case of FIG. 5, the displacement 61 is very small, but if the displacement 61 exceeds 30 μm, the shearing force generated in the workpiece 9 becomes insufficient, the cut surface of the workpiece 9 is bent, There is a problem that can not be cut. Further, the shift amount 61 is more preferably 20 μm or less, and the cutting can be performed more smoothly.

  Further, the ridgelines of the cutting edges 60a, 60b of the cutting blades 6a, 6b are continuously formed at an angle of ± 45 ° with respect to the plane of the holding portion 5, and the cutting edges of the cutting blade 6 that face each other at the time of cutting. 60a and 60b are preferably matched. This is because, in the manufacturing process of electrical products, when an operator cuts a lead wire, etc., by preparing a nipper with a different angle of the cutting blade 6, consideration has been given so that complicated wiring cutting work can be easily performed. is there. The angle range is set to ± 45 °. If the angle range exceeds 45 °, the horizontal component force acting on the cutting blade 6 when cutting is greater than the component force in the cutting direction, and the loss of force applied during cutting is large. It is to become.

  Furthermore, a specific function can be added to the clamping unit 4 by coating the clamping unit 4 having the cutting blade 6 and the holding unit 5. For example, it is possible to improve the wear resistance of the tip by applying ceramic coating or DLC. In addition, when electrostatic discharge with the nipper 1 becomes a problem during the wiring cutting operation of the electronic circuit, not only the above-described coating but also a coating such as glass or resin is applied, and the surface resistivity of the sandwiching portion 4 is within a predetermined range. It is also possible to adjust to. However, if the material itself of the sandwiching portion 4 has a predetermined surface resistivity and can have semiconductivity, these measures against discharge are not required.

  Such a nipper 1 is preferably used when cutting the wiring of an electronic circuit. In this case, it is preferable to form the holding part 4 having the cutting blade 6 and the holding part 5 with semiconductive ceramics.

  That is, when the operator or the workpiece 9 is charged, if the nipper 1 is brought close to the wiring, electrostatic discharge may occur between the two and the surrounding electronic components may be defective. By forming the film, electrostatic discharge is suppressed as much as possible.

Further, the volume resistivity of the ceramics may be in the range of 10 ³ to 10 ¹² Ω · cm, more preferably 10 ⁵ to 10 ¹⁰ Ω · cm, although it depends on the usage environment of the nipper 1 and the material of the wiring. It is in the range of cm.

  Examples of such semiconductive ceramics include zirconia with one or more transition metal oxides added as a conductivity-imparting material, and other non-metal oxides such as zinc oxide and tin oxide. Alternatively, zirconia heat-treated in a reducing atmosphere can be used.

  Further, the nipper 1 is a tweezers type as shown in FIG. 1 in addition to a general bag type, so that the tip portion is inserted into a small gap inside the electronic device to cut the workpiece 9 and at the same time the cut piece 8 It becomes possible to pinch and collect. As a result, it is possible to prevent the cut piece 8 from causing a malfunction of the device inside the electronic circuit.

  Examples of the present invention will be described below.

  A tweezer type nipper as shown in FIG. 1 was produced.

  Here, the material of the sandwiching part 4 was made of zirconia and the material of the gripping part 2 was made of stainless steel, and the sandwiching part 4 and the gripping part 2 were joined to each other at the fixing part 3 using screws.

  As shown in FIG. 6, the shape of the clamping part 4 is such that the height 70 of the cutting blade 6 is 0.04 mm, the length 71 of the edge of the cutting edge is 2 mm, and the cutting blades 6 a and 6 b are as shown in Table 1. .

  Then, a flexible cable having a thickness of 0.08 mm and a fishing line No. 3 (standard diameter 0.285 mm) in which electric wiring is formed on a bendable resin film frequently used in electronic equipment as an object to be cut.

  As an evaluation of each nipper, the sharpness can be confirmed by checking that when the operator cuts 50 flexible cables, the number of smooth cuts is 45 to 50, and 30 to 45 is Δ. The following were marked with x.

  Confirmation of the retention of the cut piece was evaluated as “◯” when the cut piece was held, and “X” when the cut piece was not held. Furthermore, the chip of the cutting blade was confirmed with a microscope after the test was completed.

Table 1 summarizes the test results of Example 1.

  From Table 1, the angle (alpha) of the blade edge | tip of a cutting blade is 80-170 degrees, the deviation | shift amount of a blade edge | tip is 30 micrometers or less, the blade edge | tip has a flat part with a width | variety of 20 micrometers, and the sample which has a flat part in a blade edge | tip (No. 2-7, 9-11, 13, 14), it was confirmed that cutting was possible reliably, the cutting edge was not chipped, and the cut piece could be held securely.

  On the other hand, in the sample (No. 1) having an angle α of the blade edge of less than 80 °, chipping occurred even with a sharp edge. In addition, the sharpness of the sample (No. 15) having a blade edge angle α as large as 180 ° was lowered.

  Similarly, in the sample (No. 8) in which the amount of deviation of the blade edge was 0, chipping occurred in the blade edge after cutting. Moreover, cutting was impossible when the deviation amount was 50 μm. This is because if the amount of deviation of the blade edge exceeds 30 μm, the shearing force is less likely to act on the workpiece 9.

It is sectional drawing which shows one Embodiment of the nipper of this invention. It is a partial expansion perspective view which shows the front-end | tip part of the nipper of this invention. It is a partial expansion perspective view which shows the front-end | tip part in other embodiment of the nipper of this invention. (A), (b) is a fragmentary sectional view of the front-end | tip part which shows a mode that the cutting blade in the various nippers of this invention was meshed, (c) is the fragmentary perspective view of the figure (b). It is a fragmentary sectional view of the front-end | tip part which shows a mode that the cutting blade in the nipper of this invention was meshed | engaged. It is a fragmentary perspective view explaining the front-end | tip shape of the nipper of Example 1. FIG.

Explanation of symbols

1 ··········· Nippers 2, 2 a, 2 b... Gripping portions 3, 3 a, 3 b... Fixed portions 4, 4 a, 4 b. 6, 6 a, 6 b .. Cutting blade 7... Side surface of the cutting blade 8... Cutting piece 9. 10 ... Flat part 30 ... Grooves 60a, 60b ... Cutting edge 61 of cutting blade ... ... Deviation amount 70 of cutting edge ...・ ・ ・ Cutting blade height 71 ・ ・ ・ ・ ・ ・ ・ ・ Lead edge ridge length 90 ・ ・ ・ ・ ・ ・ ・ ・ Groove depth

Claims (9)

A nipper characterized by integrally including a pair of opposing cutting blades and a holding portion for holding a cut piece cut by the cutting blade. The nipper according to claim 1, wherein the holding portion includes a convex portion provided continuously to the cutting blade. The nipper according to claim 1 or 2, wherein an angle between the at least one cutting blade and the holding portion is 80 to 170 °. 4. The nipper according to claim 1, wherein a flat portion is provided at a cutting edge of the at least one cutting blade. The nipper according to any one of claims 1 to 4, wherein each cutting edge is displaced when the cutting blades are engaged with each other. The nipper according to claim 5, wherein the amount of deviation of the blade edge is 30 μm or less. The nipper according to any one of claims 1 to 7, wherein a groove for storing the cutting edge of the other cutting blade in a non-contact manner is provided at a boundary between at least one of the cutting blades and the holding portion. The nipper according to any one of claims 1 to 7, wherein the cutting blade and the holding portion are made of ceramics. The nipper according to claim 8, wherein the ceramic is semiconductive.

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