JP3014489B2 - Wire feeding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire feeding device for smoothly feeding a wire as one electrode from a wire bobbin in a wire electric discharge machine.

[0002]

2. Description of the Related Art As shown in FIG. 3, a wire feeding device 1 in a wire electric discharge machine includes a wire bobbin 2, a first roller 3, and a second roller 4, and a wire 5 drawn from the wire bobbin 2 is wound around the first roller 3. Wrap around,
Further, it is wound around the grooved second roller 4 and FIG. 3 (b)
, That is, to the next roller such as a tension roller. The first roller 3 turns the path of the wire 5 so that the wire bobbin 2
And the length of the second roller 4 as long as possible, and the influence of the position of the wire 5 unwound from the wire bobbin 2 moving back and forth (from the machine frame 6 side to the near side) within the winding width a is considered. Try to reduce it. This effect is caused by the fine wire tension caused by the wire 5 sent to the second roller 4 being swung back and forth, rising to the groove wall 7 of the second roller 4 and dropping into the groove bottom 8 (FIG. 4). It is a great change (chatter).

However, even in this case, the first roller 3
Needs to have a width b, so that chatter similar to the above occurs at the location of the second roller 4. The width b of the first roller 3 corresponds to the width of the wire bobbin 2 and the second roller 4 .
If the distance of the first roller 3 is increased, the distance becomes shorter. However, this distance cannot be unnecessarily increased on the wire electric discharge machine.

[0004] If the wire 5 is chattered, a streak is formed on the cut surface of the product, and the wire is easily broken. Further, when the wire moves up and down the groove wall 8 of the second roller, a scratch mark may be formed on the surface of the wire, which may cause disconnection of the wire.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wire feeding device that does not cause chatter on the wire.

[0006]

In a wire feeding device of a wire electric discharge machine, a second roller is rotatably supported on a supporting member . Part where the support member protrudes from the machine frame surface
It is supported by a rocking shaft on the material . The oscillating shaft is disposed rearward with respect to the feed direction of the wire with respect to the second roller, and forms a tangent to the groove bottom circle of the second roller, which coincides with the traveling direction of the wire sent from the second roller to the next roller. It is a rotation axis. The support member is configured such that the weight of the support member is equal to the weight of the second roller .

When the overall center of gravity of the second roller and the support member is close to the lower part of the swing shaft, and when there is no winding of the wire, the rotation surface of the second roller is moved from the center of the width of the winding portion of the first roller. The position is set to a plane including a line connecting the centers of the swing axes.

[0008]

When the second roller rotates, the wire from the first roller is turned back to guide the wire in the traveling direction, and by swinging, the wire is prevented from rising to the groove wall.

The weight of the supporting member is determined by the second roller and the supporting portion.
The center of gravity with the material is brought closer to the swing axis so that the swing of the second roller can be performed with a light force, and the neutral position for the swing of the second roller is set to the neutral position of the wire path from the first roller to the second roller. Set at the center of the fluctuation range.

[0010]

FIG. 1 shows the relationship between the first roller 3 and the second roller 4, and FIG. 2 shows the structure of the second roller 4. These rollers 3, including the wire bobbin 2,
The arrangement relationship of the wire 4 is the same as that of the conventional case shown in FIG. 3B, and the wire 5 pulled out from the wire bobbin 2 is the first wire.
The sheet is folded by the roller 3 to reach the second roller 4, further folded by the second roller 4 and sent to the next roller. The wire bobbin 2 is normally provided with a braking force to prevent idle rotation, whereby a slight back tension acts on the wire 5 of the wire feeding device 1.

As shown in FIG. 2, the second roller 4 is a grooved roller, and is rotatably supported by a rotating shaft 10 at the tip of a support frame 9. The support frame 9 is an L fixed to the machine frame 6.
The protruding portion of the character-shaped member 11 is pivotally supported by a swing shaft 12 so as to be swingable in the front-rear direction (machine frame side-front side). The swinging shaft 12 is moved relative to the second roller 4 as shown in FIG.
One of the tangents (tangent c) of the circle formed by the groove bottom 8 of the second roller 4 is disposed behind the wire 5 in the sending direction P, and is used as a rotation axis. Further, when the second roller 4 is attached to the machine frame 6 via the support frame 9, the rotation surface thereof is parallel to the machine frame surface as shown in the figure, the swing shaft 12 is higher than the rotation shaft 10, and The tangent line c is attached so as to coincide with the traveling direction P of the wire 5. Accordingly, when the second roller 4 in this state is viewed from the sending direction P of the wire 5 (FIG. 1), the second roller 4 moves back and forth like A, B, and C around the upper end P0 of the groove bottom 8. Swingable.

The support frame 9 further includes a counterweight 13 on the side opposite to the second roller 4 with respect to the swing shaft 12, that is, above the swing shaft 12, and the support frame 9 and the counterway.
And a support member for the second roller 4.
The quantity is adapted to counter the weight of the second roller.
That is, the weight and arrangement of the counterweight 13 is such that the total center of gravity G of the second roller 4, the support frame 9 and the counterweight 13 approaches the lower part of the swing shaft 12 as shown in FIG. When the wire is not wound, a line Q0 connecting the rotation surface of the second roller 4 to the center of the swing shaft 12 from the center of the winding width b of the first roller 3
(A wire path). Therefore, in this embodiment, the second wire 5 is not wound.
The roller 4 is stabilized in an inclined state in which the lower portion is on the near side.

Reference numeral 14 denotes a presser brush, which is attached to the front end of the counterweight 13 which projects forward.
It is urged toward the groove bottom 8 of the roller 4.

Wire 5 pulled out from wire bobbin 2
Is folded by the first roller 3 and reaches the second roller 4. At this time, the direction of the wire 5 from the first roller 3 to the second roller 4 changes within the range of the winding width b from Q0 to Q3. However, since the second roller 4 is swingable about the point P0, when the direction of the wire 5 and the angle of the rotating surface of the second roller 4 do not match, the center of gravity G about the point P0 is used. It is oscillated arbitrarily by the moment or the component of the back tension of the wire 5. As a result, the second roller 4 inclines its rotating surface in accordance with the direction in which the wire 5 enters, as shown in states A, B, and C in FIG. become. Therefore, even if the wire 5 reaches the second roller 4 at any angle from the first roller 3, the wire 5 does not rise to the groove wall 7.

At this time, since the position of the center of gravity G of the portion including the second roller 4, the support frame 9 and the counterweight 13 is close to the center of the pivot shaft 12 of the hemorrhoid frame 9, the second
The swing of the roller 4 is performed with a very light force (about 1 to 2 g), and the operation of swinging the second roller 4 hardly affects the wire tension. Also, the first
The wire 5 traveling from the roller 3 to the second roller 4 is hardly bent or scraped. And
The rotation surface of the second roller 4 is determined by the center of gravity G,
In a state where the wire 5 is not wound, the first roller 3
Since the position of the plane including the line Q0 connecting the center of the swing shaft 12 from the center of the winding width b is set to the neutral position, the direction of the wire 5 in FIG. As described above, the second roller 4 can be swung in both directions with the same light force. Further, the swing of the second roller 4 eventually causes the tangent line c that coincides with the sent wire 5 to be the rotation axis (center P0), so that the position of the wire 5 changes with respect to the next roller. Nothing.

The above is one embodiment. The structures of the support frame 9, the stay 11, and the counterweight 13 are arbitrary, and the position of the counterweight 13 can be adjusted.
A structure in which the position of the center of gravity G can be adjusted according to the wire tension or the like can also be adopted.

[0017]

As described above, since the wire is always in contact with the groove bottom of the second roller and is turned, there is no chatter in the fed wire. As a result, a product with a clean processed surface can be obtained. In addition, inconvenience such as disconnection due to damage to the wire is reduced.

[Brief description of the drawings]

FIG. 1 is a side view for explaining an operation.

2A is a plan view, FIG. 2B is a front view, and FIG. 2C is a side view.

3A is a plan view of a conventional example, and FIG. 3B is a plan view of a conventional example.
Simplified front view

FIG. 4 is a diagram for explaining an operation state of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Wire feeding device 2 Wire bobbin 3 First roller 4 Second
Roller 5 Wire 8 Groove bottom 9 Support frame 10 Rotary shaft 11 Member 12 Swing shaft 13 Counter weight

Claims (1)

(57) [Claims] 1. A wire bobbin, a first roller, and a second roller are provided along a machine frame surface of a wire electric discharge machine, and a wire drawn from the wire bobbin is wound around the first roller, turned back, and further provided with a grooved second roller. A wire feeding device that feeds the next roller to the next roller.
As the support member, relative to the second roller to a tangent to the groove bottom circle in the second roller is arranged behind relates dispensing direction of the wire second from the roller follows the roller as well as rotatably supporting the roller to the support member A pivot shaft having a tangent line that coincides with the traveling direction of the wire sent out to the member is pivotally supported on a member protruding from the machine frame surface, and the weight of the support member opposes the weight of the second roller. Yo
Uni the support member constitutes a comprehensive center of gravity of the second roller and the supporting member, as well as close to the lower portion of the swing axis, the winding of the wire of the first roller rotation surface of the second roller when no winding width A wire sending device, which is located at a position including a line connecting the center of the swing axis from the center of the wire.