JP3036728B2 - Wire cutting device and wire cutting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire cutting apparatus and an electric wire cutting method for surely and quickly cutting a press-bonded electric wire between press-connecting terminals.

[0002]

2. Description of the Related Art FIG. 12 shows a conventional electric wire cutting apparatus described in Japanese Patent Application Laid-Open No. 57-53083.
The device 72 includes a template 74 having a wire receiving groove 73 partially penetrated therein, and a carrier plate 76 having a flat blade-shaped cutter 75 which can enter the wire receiving groove 73.
And a protruding plate 78 having an electric wire pushing pin 77 which can enter the electric wire accommodating groove 73 from the back side of the template 74.

The electric wires 79 routed on the template 74
Is cut by the cutter 75 by joining the carrier plate 76, and divided into a plurality of connection wires 79 '(see FIG. 13). The connection electric wire 79 'is pushed by the electric wire push-out pin 77 of the protruding plate 78, and as shown in FIG.
Is press-connected to the press-contact terminal 81 to form a press-contact circuit body 82.

[0004]

However, in the above-described conventional electric wire cutting apparatus, when the electric wire is displaced in the longitudinal direction in the housing groove at the time of cutting, the variation of the cutting width becomes large. It can take a lot of work time with caution. In addition, there is a problem that only one kind of electric wire can be handled because the electric wire is held in the accommodation groove. Further, there is another problem that the cut surface is likely to become messy because the electric wire is cut off vertically by a cutter.

SUMMARY OF THE INVENTION In view of the above, the present invention provides an electric wire cutting apparatus and an electric wire cutting method which can cut an electric wire accurately, surely and quickly with a constant cutting width, a clean cut surface, and no electric wire cutting residue. The purpose is to provide.

[0006]

In order to achieve the above object, the present invention relates to a nipper having a pair of inclined blades perpendicular to an electric wire, and a reciprocating means such as a cylinder connected to the nipper and moving the nipper up and down. A rotating shaft for inverting the nipper,
And a driving means for driving the rotating shaft. Here, a structure is also possible in which the nipper is slidably engaged with the inclined table, the advance / retreat means is fixed to the inclined table, and the rotating shaft is connected to the inclined table.

Also, a nipper having a pair of inclined blades orthogonal to the electric wire, an inclined table for slidably engaging the nipper, and forward / backward means such as a cylinder fixed to the inclined table and connected to the nipper, A first electric wire cutting device including a rotating shaft for inverting the inclined table and a driving unit for driving the rotating shaft, and a pair of inclined blades orthogonal to the electric wire, each having an inward symmetry with each other A second wire cutting device comprising a pair of nippers inclined to each other and an advancing / retracting means such as a cylinder connected to the pair of nippers and capable of moving the pair of inclined blades crosswise with respect to the electric wire is adopted. .

Further, the wire is cut in the orthogonal direction by a pair of inclined blades of the inclined nipper, and the nipper or the table holding the electric wire is turned 180 °, and then the electric wire is cut by the inclined blade. A first electric wire cutting method for cutting at a fixed interval from a location, and the pair of inclined nippers having a pair of inclined blades each orthogonal to the electric wire by alternately crossing the pair of inclined blades. A second electric wire cutting method for cutting electric wires at regular intervals is also adopted.

In the first and second electric wire cutting methods, after the electric wire is cut a second time by the inclined blade, the inclined blade is closed with respect to the electric wire cutting tip remaining between the two cuts. The third method to remove the tip by retracting from the wire cutting position in the state where the wire is cut, or moving the wire in the direction orthogonal to the wire tip with the inclined blade closed, and retreating by opening the inclined blade at the wire cutting position Then, a fourth electric wire cutting method is employed in which the inclined blade is closed again and the electric wire cutting tip is advanced toward the electric wire cutting tip, or the tip removing member is advanced toward the electric wire cutting chip by the driving means to remove the electric wire cutting chip.

[0010]

In the first electric wire cutting device, the nipper is first advanced toward the electric wire by the advancing / retreating means, and the electric wire is cut at one place by the opening and closing operation of the pair of inclined blades. Next, the rotating shaft and the nipper are integrally turned 180 ° by the driving means, and the pair of inclined blades move to the symmetric position. Then, the electric wire is cut again by the pair of inclined blades at a predetermined interval from the cut portion. The first wire cutting device corresponds to the first wire cutting method.

In the second electric wire cutting device, first, the inclined blade of one of the nippers cuts the electric wire, and the one of the nippers is retracted by the advance / retreat means, and then the other nipper is advanced.
The cutting blade of the other nipper cuts the wire at regular intervals. The second wire cutting device corresponds to the above-described second wire cutting method.

In the third method, immediately after cutting the electric wire, the inclined blade is retracted in a closed state or moves in a direction perpendicular to the electric wire in a state where the inclined blade is closed, so that the cutting tip remaining after the cutting is cut. Is removed.

In the fourth method, the cutting tip is removed by moving the nipper forward with the inclined blade being closed and hitting the electric wire cutting tip with the inclined blade, or by the tip removing member driven by the driving means. .

[0014]

FIG. 1 shows a first embodiment of an electric wire cutting apparatus according to the present invention. This electric wire cutting device 1 is disclosed in
As described in JP-A-172908, an electric wire 4 pre-pressed to a press contact terminal 3 in an electric connection box 2 is cut by an air nipper 5, and the air nipper 5 is a pneumatic rotary actuator 6 as a driving means. Is supported by being inclined with respect to the vertical rotation shaft 7 of the air cylinder 8 and can be turned 180 °, and is connected to a telescopic rod 9 of an air cylinder 8 which is a reciprocating means, and can move up and down with respect to the electric wire 4.

A rotary shaft 7 of the rotary actuator 6 has an intermediate portion supported by a bearing 10, and a tilt base 11 is fixed to a tip of the rotary shaft 7, and is formed on a tilt surface 11 a of the tilt base 11. The air nipper 5 is slidably engaged with the guide rail 11c. The air cylinder 8 is mounted on the inclined table 1.
1 is fixed to the bottom 11b. The air nipper 5 may be inverted using an electric motor (not shown) and a reduction gear as driving means instead of the rotary actuator 6.

The air nipper 5 is preferably made of Muromoto MS3 or the like. As shown in FIG. 2, a box-shaped air nipper main body 12 and a support shaft 13 in the air nipper main body 12 support the air nipper 5 so that air pressure and It is constituted by a pair of inclined blades 14 and 14 driven to open and close by a return spring (not shown). The inclined blade surface 14a of the inclined blade 14 is positioned orthogonal to the electric wire 4 as shown in FIGS. 1 and 3 (top view), and cuts the electric wire 4 vertically.

As shown in FIG. 3A, the back side of the inclined blade 14 is tapered (1) toward the outside with respect to the inclined blade surface 14a.
4b), the inner cut surface 4b facing the outer cut surface 4a of the electric wire 4 as shown in FIG.
It is easy to be stripped. Therefore, the air nipper 5 is turned 180 ° after the electric wire is cut as shown in FIG.
As shown in (c), the inclined blade 14 is symmetrically positioned around the center 7a of the rotating shaft 7 in FIG.
Is cut off in the neighborhood 4c.

Thus, the cut surfaces 4a, 4c of the electric wires are clean.
Is obtained, and at the same time, the electric wire 4 is cut at a certain interval L. The distance L prevents the wires 4 from contacting each other, so that the wires 4 can be reliably shut off between the press contact terminals 3 and 3, and the wire circuit 4 is reliably divided.

Instead of reversing the air nipper 5, the table 15 holding the electric wires 4, that is, the electric connection box 2 in FIG. 1, may be reversed. In this case, the table 15 can be rotated around the rotating shaft 7 of the electric wire cutting device 1 by using, for example, a rotary driving means (rotary actuator) 16 described later in the embodiment of FIG.

FIGS. 4 and 5 show a second embodiment of the electric wire cutting apparatus according to the present invention. This wire cutting device 17
Is connected to the air cylinders 20 and 21 as advancing / retracting means in a state where the pair of air nippers 18 and 19 are inclined symmetrically, and the inclined blades 22 and 23 of the air nippers 18 and 19 are positioned so as to cross each other. Things. Each air nipper 1
8, 19 are rods 24, 25 of air cylinders 20, 21.
To the rod 2 via brackets 26 and 27.
It is possible to advance and retreat with respect to the electric wire 4 by expansion and contraction of 4, 25.
Each air nipper main body 28, 29 is located parallel to the rods 24, 25, and each air cylinder 20, 21 is fixed to the apparatus main body 30.

After the electric wire 4 is vertically cut by the inclined blade 22 of one air nipper 18 as shown in FIG. 4, the one air nipper 18 is retracted by the compression operation of the rod 24 of the cylinder 20 as shown in FIG. Is advanced by the extension operation of the rod 25 of the cylinder 21, and the other air nipper 1
The 9 inclined blades 23 vertically cut the opposing position 4c at a slight distance from the wire cutting surface 4a of the one air nipper 18. Here, the inclined blades 22 and 23 intersect each other as shown in FIG.

According to the electric wire cutting device 17, the electric wire 4 can be cut quickly without the reversing operation of the air nipper 5 or the table 15 as in the first embodiment. Further, since the cutting width L is mechanically determined by the alternating operation of the pair of air nippers 18, 19, the repetition accuracy of the cutting width L is high (this is the same when the air nipper 5 is inverted in the first embodiment). . The cut surfaces 4a and 4c of the electric wire 4 are inclined surfaces 22a and 2 of the two inclined blades 22 and 23 orthogonal to the electric wire 4 as in the previous example.
3a makes it easy to clean.

FIG. 6 shows an electric wire cutting device 17 according to the second embodiment.
This shows an application example of the rotary actuator 1.
The pair of air nippers 18 and 19 are installed so as to face the electric connection box 2 ′ fixed to the end of the rotation shaft 31 of the sixth motor 6.
The electric connection box 2 ′ is pressed and fixed to the table 33 by the opposed horizontal cylinders 32, 32, and the rotary actuator 16 is connected to a moving mechanism (34) (not shown).
It can be moved in the Y direction, and the wire pressing process, the wire transfer process, and the wire laying process in the previous process (for details, see
172908) are sequentially transported while holding the electrical junction box 2 '.

The pair of air nippers 18 and 19 are respectively
Guide rails 36 fixed to a vertical board 35 of the apparatus main body,
37 are slidably engaged with each other, and can be alternately advanced and retracted with respect to the electric wires 4 in the electric connection box 2 ′ by the air cylinders 21 and 21 fixed to the vertical board 35.

FIGS. 7 and 8 show a detailed structure of an electric wire cutting device 39 similar to the second embodiment. In FIG. 7, a pair of air nippers 4 inclining inwardly and symmetrically.
8, 0 and 41, the air nipper main bodies 42 and 43 are fixed to vertically long connecting members 44 and 45, and the connecting members 44 and 45 pass through the oblong long holes 47 and 48 of the vertical substrate 46, as shown in FIG. It communicates with the back side and is slidably engaged with guide rails 51 and 52 of guide members 49 and 50 fixed to the vertical board 46. The connecting members 44, 45 are connected to the distal ends of the rods 55, 56 of the air cylinders 53, 54,
The air cylinders 53 and 54 are fixed to a vertical board 46. By driving the air cylinders 53, 54, the inclined blades 57, 58 of the pair of air nippers 42, 43 are moved to the device frame 5
9 protrudes in a cross toward the electric wire 4.

In this device 39, one connecting member 44
The blow tube 60 is fixed to the
Can be blown off. Further, one guide member 49 is engaged with a guide rail 61 in the orthogonal direction, connects the orthogonal plate portion 62 to the horizontal cylinder 63, and
Can be moved horizontally.

Further, the vertical substrate 46 is fixed to a parallel base substrate 64 via a screw shaft 65, and the position of the vertical substrate 46 can be finely adjusted vertically by rotating the screw shaft 65. Each air nipper 40, 41 and air cylinder 53,
The piping to the horizontal cylinder 63 and the blow pipe 60 is performed via a plurality of solenoids 67 fixed to a manifold 66 on a bottom plate portion 64a of the base substrate 64. The base substrate 64 is connected to linear guides 68 and 69 in the XY directions and is movable in two-dimensional directions.

A series of operations when the inclined blade 14 of the air nipper 5 cuts the electric wire 4 is as follows. First, before the electric wire is cut, the inclined blade 14 is open with the telescopic rod 9 retracted. Next, the air nipper 5 is advanced by the telescopic rod 9 with the inclined blade 14 kept open, and the inclined blade 14 is closed to cut the electric wire 4. After the electric wire is cut, the inclined blade 14 is opened while the air nipper 5 is advanced by the telescopic rod 9. And
The air nipper 5 is retracted from the position where the electric wire 4 is cut by the telescopic rod 9 with the inclined blade 14 kept open.

Immediately after the electric wire is cut, the inclined blade 1 of the air nipper 5
Since the wire 4 is opened at the position where the wire 4 is cut, the wire cutting tip 4e is left between the press contact terminals 3 as shown in FIGS. In the electric wire cutting device of the second embodiment, in order to remove the electric wire cutting tip 4e, after cutting the inclined blade 14 on the crossed side (the side cut for the second time), the inclined blade 14 is not opened and remains closed. Then, the wire 4 is retracted from the cut position. That is, the inclined blade 14 is retracted in a closed state. Alternatively, after cutting the wire as shown in FIGS. 11A to 11D, the air nipper 5 on the crossed side is connected to the wire cutting tip 4.
e, the air nipper 5 and the inclined blade 14 perform a series of operations of opening the inclined blade 14 in a direction perpendicular to the direction e, so that after cutting the electric wire, about 1.4 mm between the two cuts.
The wire cutting tip 4e remaining in the narrow place is removed.

Alternatively, instead of moving the air nipper, a method of removing the wire cutting tip by moving the entire device 39 laterally on the linear guide 69 in FIG. 8 and advancing the air nipper may be used. Note that the angle of the air nipper may be changed so as to hit the wire cutting tip.

Further, in the electric wire cutting device of the first embodiment, in order to remove the electric wire cutting tip 4e, after cutting the electric wire, the air nipper 5 is retracted from the position where the electric wire 4 was cut by the telescopic rod 9 and opened. The tilted blade 14 is closed again. In FIG. 1, the table 15 is
, The air nipper 5 is advanced by the telescopic rod 9, and the closed inclined blade 14 is brought into contact with the center of the cutting tip 4e. Alternatively, the entire device 1 may be moved in the lateral direction. As a result, the wire cutting tip 4e remaining between the two cuts in a narrow space of about 1.4 mm after the wire cutting is removed.

Instead of hitting the inclined blade, the tip removing member (not shown) may be advanced toward the tip by a driving means such as an air cylinder to remove the tip. For example,
A rod-shaped member or the like attached to an air cylinder is used.

[0033]

As described above, according to the present invention, one inclined air nipper or the table on the wire holding side is inverted (claims 1, 2 and 4), or a pair of inclined air nippers is alternately arranged. By driving and crossing the inclined blades (claims 3 and 5) to cut the wires, the wires are cut at predetermined intervals, and a plurality of wire circuits are formed without short circuit. Thereby, for example, the electric wire between the press contact terminals is reliably cut, and a highly reliable electric connection box is produced.

In particular, by alternately moving the pair of air nippers alternately, it is possible to perform a cutting operation quickly and with a high accuracy in the repetition of the cutting width, thereby achieving a tact-up in a production line such as an electric junction box. Further, since the electric wire is cut orthogonally by the pair of inclined blade surfaces, the cut surface of the electric wire is clean, and there is no fear of short-circuit due to fraying of the wire, and the commercial value of the electric connection box and the like is increased. In addition, for example, by cutting the electric wire held by the press contact terminal with a pair of inclined blades, electric wires of any diameter can be cut.

Further, after the electric wire is cut, the nipper and the tip removing member move so as to hit the electric wire cutting tip (claim 7), or the nipper retreats with the inclined blade closed, or moves in a direction perpendicular to the electric wire. According to claim 6, the wire cutting tip remaining between the two cuts is removed. Thus, since the wire cutting tip does not remain between the wires, the troublesome work of removing the cutting tip is not required, and the problem of short-circuiting of the wire does not occur.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of an electric wire cutting device according to the present invention.

FIG. 2 is a perspective view showing an air nipper.

3A is a plan view showing a state in which the electric wire is cut, FIG. 3B is a plan view showing a state in which the electric wire is cut, and FIG. 3C is a plan view showing a state in which the electric wire is cut by inverting the nipper.

FIG. 4 is a front view showing a second embodiment of the electric wire cutting device according to the present invention.

FIG. 5 is a front view of the same electric wire in a cut state.

FIG. 6 is a front view showing a specific configuration (application example) of the second embodiment.

FIG. 7 is a front view showing a detailed configuration of an electric wire cutting device similar to the second embodiment.

FIG. 8 is a rear view of the same.

FIG. 9 is a plan view showing a state after cutting the electric wire.

FIG. 10 is a side view showing a state after cutting the electric wire.

11A and 11B are side views showing the movement of the nipper before cutting the electric wire, FIG. 11A is a side view before cutting, FIG. 11B is a side view when cutting, and FIG. And (d) is a side view in a state where the nipper is retracted.

FIG. 12 is an exploded perspective view showing a conventional example.

FIG. 13 is a perspective view showing the completed press-contact circuit body.

[Explanation of symbols]

1,17,39 Wire cutting device 4 Wire 4e Wire cutting chip 5,18,19,40,41 Air nipper 6 Rotary actuator 7 Rotating shaft 8,20,21,53,54 Air cylinder 11 Inclined table 14,22,23 , 57,58 Inclined blade L interval

Continuation of front page (72) Inventor Yoshiaki Nomoto 206-1 Nunobikihara, Haibara-cho, Haibara-gun, Shizuoka Prefecture Inside Yazaki Parts Co., Ltd. (56) References JP-A-4-200215 (JP, A) JP-A-6-77415 (JP, U) JP-A-1-157520 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01R 43/00-43/02

Claims (7)

(57) [Claims] 1. A nipper having a pair of inclined blades orthogonal to an electric wire, an advancing / retreating means such as a cylinder connected to the nipper and elevating the nipper, and a rotating shaft for inverting the nipper;
An electric wire cutting device comprising: a driving means for driving the rotating shaft. 2. The electric wire cutting device according to claim 1, wherein the nipper is slidably engaged with the inclined table, the advance / retreat means is fixed to the inclined table, and the rotating shaft is connected to the inclined table. . 3. It has a pair of inclined blades orthogonal to the electric wire,
A pair of nippers inclined inwardly and symmetrically with each other, and advancing / retreating means such as a cylinder connected to the pair of nippers and capable of moving the pair of inclined blades crosswise with respect to the electric wire. Wire cutting device. 4. An electric wire is cut in the orthogonal direction by a pair of inclined blades of an inclined nipper, and after the nipper or a table holding the electric wire is turned 180 °, the electric wire is cut by the inclined blade. An electric wire cutting method characterized by cutting at a certain interval from a location. 5. A pair of inclined nippers having a pair of inclined blades orthogonal to the electric wire, wherein the pair of inclined blades are alternately crossed to cut the electric wire at a constant interval. How to cut wires. 6. After the electric wire is cut for the second time by the inclined blade, the electric wire cutting tip remaining between the two cuts is retracted from the electric wire cutting position in a state where the inclined blade is closed, 6. The wire cutting method according to claim 4, wherein the wire cutting tip is removed by moving the wire cutting tip in a direction perpendicular to the wire cutting tip with the inclined blade closed. 7. After the electric wire is cut for the second time by the inclined blade, the inclined blade is opened and retracted at the electric wire cutting position with respect to the electric wire cutting tip remaining between the two cuts, and the inclined surface is again cut. Close the blade and advance toward the wire cutting tip,
6. The wire cutting method according to claim 4, wherein the tip removing member is advanced by the driving means toward the wire cutting tip to remove the wire cutting tip.