JPH0118574B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire cutting device for cutting wires used as lead wires in electronic components such as resistors, capacitors, diodes, etc. when welding them.

For example, as shown in Fig. 1, in the case of resistor A, a wire B serving as a lead wire is electrically welded to a cap _a2 fitted on both sides of an insulator _a1 , and after welding, wire B is attached to a predetermined length. Cut into. After cutting, the wire B is advanced and the above operation is repeated to form a lead wire. In this way, the cut portion of the wire B is the welded portion with the cap _a2 , but conventional cutting devices are configured to cut the wire B in a direction perpendicular to its axis. Therefore, during electric welding, the welded portion of the wire B melts and protrudes on the outer surface of the cap _a2 to a point larger than the outer diameter of the wire as indicated by b, resulting in an unsightly appearance.

An object of the present invention is to provide a wire cutting device that can prevent the welded portion of a wire such as a lead wire for electronic components from protruding beyond its outer diameter during welding, thereby improving the appearance. This is what I am trying to do.

In order to achieve the above object, the present invention is provided with an insertion hole for wires such as lead wires for electronic components, and has sloped surfaces on both sides that gradually become narrower from the rear toward the axis of the insertion hole. a receiving cutter with a tip of the insertion hole opened laterally; a supply device that intermittently supplies wire to the insertion hole of the receiving cutter; It is provided with a guide groove that gradually becomes narrower from the open side to the bottom side so that it can move in a direction perpendicular to the
A cutter having a tip having a slope that gradually slopes backward from the open side of the guide groove to the bottom side, and a blade that gradually becomes narrower from the tip to the rear due to the guide groove and the slope, and this cutter. By moving the cutter forward relative to the receiver cutter, the wire inserted into the insertion hole of the receiver cutter is moved intermittently. It is characterized in that it is cut to have an inclined surface.

EMBODIMENT OF THE INVENTION Hereinafter, an example in which the cutting device of the present invention is used to cut a wire serving as a lead wire for a resistor will be specifically described with reference to the drawings. In Fig. 4, reference numeral 1 denotes a welding wheel that serves as an electrode, and has a number of grooves 2 formed on its outer periphery into which a part of the outer periphery of a resistance element A can be fitted, and is rotatably supported with respect to a machine frame (not shown). has been done.
This welding wheel 1 is intermittently rotated by a drive device (not shown), and a chute (not shown) is formed in the groove 2.
More resistive elements A are sequentially supplied. 3 is wire B
It is provided so that it can move forward and backward facing the welding wheel 1 using a chuck that serves as an electrode. Reference numeral 4 denotes a cutting device of the present invention, which is provided facing the outside of each chuck 3. To elaborate on this,
As shown in FIGS. 4 to 8, the receiving cutter 5 has an insertion hole 6 for the wire B formed in the axial direction thereof. The insertion hole 6 has a large diameter on the rear side and a small diameter on the front side, and the large diameter part and the small diameter part are continuous by a tapered part. The small diameter portion is formed to have approximately the same diameter as the outer diameter of the wire B, or a slightly larger diameter. The distal end of the receiving cutter 5 is formed with an inclined surface 7 on both left and right sides that gradually becomes narrower toward the axis of the insertion hole 6 as it reaches the distal end from the rear. is open to the public. In the illustrated example, the tips of both inclined surfaces 7 intersect at a perpendicular line passing through the axis of the insertion hole 6 . This receiver cutter 5 is fitted inside the tip of the receiver cutter shaft 8 and fixed with a screw 9, and the insertion hole 6 of the receiver cutter 5 is communicated with the insertion hole 10 of the wire B formed in the receiver cutter shaft 8. There is. This receiving cutter shaft 8 has a support plate 11
is inserted and fixed. The wire B is inserted into the receiving cutter shaft 8 and the insertion holes 10 and 6 of the receiving cutter 5 by a feeding device. In the feeding device, a pair of rollers 12 and 13 are arranged vertically in parallel and rotatably supported, and one roller 12 or 1
3 is linked to a motor (not shown). By driving the motor, the rollers 12 and 13 are rotated, and the wire B held between them can be advanced with respect to the receiving cutter shaft 8 and the receiving cutter 5.

The cutter 14 has a guide groove 1 in its longitudinal center.
5 is formed. The guide groove 15 is arranged along the inclined surface 7 of the receiving cutter 5 so that it can move in a direction orthogonal to the axis of the insertion hole 6, so that the width becomes gradually narrower from the open side to the bottom side, that is, the cross section V It is formed into a letter shape. An inclined surface 16 is formed at the tip of the cutter 14, and this inclined surface 16 is gradually inclined backward from the open side of the guide groove 15 to the bottom side. A blade 17 is formed which becomes gradually narrower toward the end, that is, becomes V-shaped. The cutter 14 is fixed at its rear side to a mounting member 19 with a screw 18. This mounting member 19 is fixed to the upper end of a vertical movable shaft 20 with a screw 21, and the movable shaft 20 is inserted and supported through a bearing member 23 fixed to the receiving cutter shaft 8 with a screw 22 so as to be movable up and down via a bearing 24. has been done. A support member 25 is fixed to the lower end of the movable shaft 20 with a screw 26, and a bearing 27 is attached to the end surface of the support member 25.
is rotatably supported by a screw 28. An intermediate portion of the swing lever 31 is swingably supported by a pin 32 on a support member 30 fixed to the support plate 29, and a bifurcated portion 33 formed at one end of the swing lever 31 is fitted into the bearing 27. A cam follower 34 is rotatably supported at the other end of the swing lever 31. Rotating shaft 35 supported on the machine frame
A disc 36 is attached on top, a cam groove 37 is formed in the disc 36, and the cam follower 34 is inserted into the cam groove 37. The rotating shaft 35 is linked to a motor (not shown). By driving the motor and rotating the rotating shaft 35 and the disc 36, the ridges 3 of the cam groove 37 of the disc 36 are removed.
7a, the cam follower 34 is intermittently lowered. Along with this, the swing lever 31 rotates counterclockwise to raise the movable shaft 20 via the bearing 27, the support member 25, etc., and as the movable shaft 20 rises, the cutter 14 is attached to the receiving cutter via the mounting member 19. 5 can be advanced.

Next, the operation of the present invention will be explained. The rollers 12 and 13 are rotated by the drive of the motor, and the wire B is advanced, and the disc 36 is rotated by the drive of the motor. Wire B is the receiving cutter 5
When the feed is stopped by stopping the motor and rollers 12 and 13, the ridge 37a of the cam groove 37 lowers the cam follower 34 as described above, and the cutter 14 advances relative to the receiving cutter 5. . At this time, the guide groove 15 of the cutter 14 moves forward along the inclined surface 7 of the receiving cutter 5, and the blade 17 of the cutter 14 gradually becomes narrower from the tip toward the rear due to the guide groove 15 and the inclined surface 16. The blade 17 is shaped like a letter and gradually slopes toward the front side of the insertion hole 6 from the tip to the rear, so that the blade 17 guides the wire B with sloped surfaces B that gradually become narrower toward the wire axis on both sides. ₁ (see Figures 2A and 3A). During this cutting, even if the diameter of the front small diameter part of the insertion hole 6 is larger than the outer diameter of the wire B, the blade 1
Since wire 7 is formed in a V-shape as described above, the wire B is brought together so that its axis is located on a line perpendicular to the axis of the insertion hole 6, so that it can be cut reliably. After cutting, the cam follower 34 moves to the valley of the cam groove 37, and the cutter 14 retreats with respect to the receiving cutter 5. Subsequently, the rollers 12 and 13 are rotated by driving the motor, and the wire B is advanced. Chuck 3 with wire B open
When inserted into the motor and rollers 12,1
3 stops. At the same time, the chuck 3 closes and moves forward, pressing the cut and welded part of the wire B to the center of the cap a ₂ on both sides of the resistor body on the welding wheel 1, as shown in FIGS. 2B and 3B. and electric welding. At this time, a recess a ₃ is formed in the center of the inside of the cap a ₂ as shown in FIG. As shown in Figure B, the wire B can be melted into the cap _a2 , and the amount of wire B can be absorbed by the recess _a3 to prevent it from protruding to the outside of the cap _a2 . In addition to the above, absorption can be achieved by forming a gap between the insulator _A1 and the cap _A2 , or by forming a recess in the insulator _A1 ). Furthermore _, even if no recess is formed in cap _a2 as shown in FIG. Since the amount is small, the protrusion to the outside of the cap can be reduced as shown in FIG. 3B.

As is clear from the above description, according to the present invention, the receiving cutter is provided with insertion holes for wires such as lead wires for electronic components on both sides, and gradually extends from the rear toward the axis of the insertion hole as it reaches the tip. The cutter is provided with a narrow sloped surface, the tip of the insertion hole is opened to the side, and the cutter is moved along the slope of the receiving cutter in a direction perpendicular to the axis of the insertion hole. It is equipped with a guide groove that gradually becomes narrower as it reaches the side, and has an inclined surface at the tip that gradually slopes backward as it reaches the bottom side from the open side of the guide groove, and as it reaches the rear from the tip due to the guide groove and slope. Since it is equipped with a blade that gradually becomes narrower, by moving this cutter intermittently, the wire that is intermittently supplied to the insertion hole of the receiving cutter is gradually narrowed toward the axis of the wire on both sides. It can be cut to have a narrow slope. Therefore, when electrically welding a cap or the like of an electronic component, the protrusion of the cap or the like to the outside can be minimized.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway enlarged plan view showing the state of welding the cap and lead wire in a conventional resistor, and Fig. 2A shows the state of the lead wire cut by the device of the present invention before being welded to the cap of the resistor. Fig. 2B is an enlarged partially cutaway plan view showing the state after welding, Fig. 3A is a partially cutaway enlarged plan view showing the state after welding, and Fig. 3A is a welding of the lead wire cut by the device of the present invention to the cap of the resistor. FIG. 3B is an enlarged partially cutaway plan view of another example showing the state before welding, FIG. 3B is an enlarged partially cutaway plan view showing the state after welding, and FIG. Partially cutaway side view shown, No. 5
The figure is a front view thereof, and FIGS. 6 to 8 are an enlarged plan view, an enlarged front view, and an enlarged side view of the receiving cutter and the cutter used in the present invention, respectively. A...Resistor, _a1 ...Insulator, _A2 ...Cap,
a ₃ ... recess, B ... lead wire (wire), 1 ...
Welding wheel, 3... Chack, 4... Cutting device of the present invention, 5... Receiver cutter, 6... Wire insertion hole, 7... Inclined surface, 8... Receiver cutter shaft, 1
2, 13... Roller (feeding device), 14... Cutter, 15... Guide groove, 16... Inclined surface, 17
...Blade, 20...Movable axis, 24...Bearing,
31... Swing lever, 34... Cam follower,
36...disc, 37...cam groove.

Claims (1)

[Claims] 1 Equipped with an insertion hole for wires such as lead wires for electronic components, and provided with inclined surfaces on both sides that gradually become narrower toward the axis of the insertion hole from the rear to the tip, and the tip of the insertion hole is located on the side. A receiving cutter opened to
A supply device that intermittently supplies the wire to the insertion hole of the receiver cutter, and the wire is gradually fed from the open side to the bottom side along the inclined surface of the receiver cutter so as to be able to move in a direction orthogonal to the axis of the insertion hole. It is equipped with a guide groove that becomes narrower in width, and has a sloped surface at the tip that gradually slopes backward from the open side of the guide groove to the bottom side, and the width gradually becomes narrower from the tip to the rear due to the guide groove and slope. A device for cutting wires such as lead wires for electronic components, comprising a cutter equipped with a blade and a moving device that moves the cutter intermittently.