JP2002011517A - Wire chucking apparatus for wire drawing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus capable of increasing a holding action of a wire and facilitating a relaxing work for wire holding. SOLUTION: The apparatus consists of a chuck main body 10 fixed to a coiling drum D via a pulling chain 11, a wedge part 9 freely inserting/detaching insertable/retractable with respect to a frame body 17 of the chuck main body from a coiling drum side and a compression type coil spring 12 energizing the wedge part in a die direction, a beginning end of a wire W is held by the chuck main body and the wedge part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire chucking device for a wire drawing device, and more particularly, to a chucking device for fixing a starting end of a wire to a winding drum of a drawing wire drawing device.

[0002]

2. Description of the Related Art As shown in FIG.
The wire W fed out from the supply device A is passed through the straightening roller B and the die box C and wound by the winding drum D. The winding drum D is used to reduce the surface of the wire W by the die box C. Has a required pulling force. Then, the wire W ₁ which has been withdrawn is wound onto the carrier F through the bending roller E.

FIG. 6 is an explanatory view of an essential part at the time of starting the drawing of the wire W. First, the starting end of the wire W is pre-processed (die C).
Subjected to thin to) the following _first diameter, this tipping portion Wa is passed through a die C _1, then is nipped by the take-up drum D to be fixed through a towing chain G the chucking device H. Then, pull the wire W by rotating the winding drum D, and drawing by pulling out the wire W from the die C _1.

FIG. 7 and FIG. 8 show a conventional chucking device. The chucking device H comprises a wedge portion 32 and a chuck body 33.
33 and a structure in which the leading end Wa of the wire W is sandwiched. Here, the wedge portion 32 has a lower surface 3
2a is formed in a horizontal plane, and the upper surface 32b is formed as an inclined surface which descends at a predetermined angle from the rear end 32c toward the front end 32d.

The chuck body 33 comprises a base portion 34 and a frame portion 35 fixed on the base portion 34, and the base portion 34 is attached to the wedge portion 32.
The upper surface 34a and the lower surface 34
b is a rectangular shape parallel to each other.

[0006] On the other hand, the frame 35 is formed by the left and right side walls 3.
6, 36 and an upper surface wall 37 inclined at the same angle as the inclined surface of the wedge portion 32, and lower edges of the left and right side walls 36 are fixed to the side surfaces of the base portion 34, respectively. Accordingly, the frame 35 has a large opening area at the rear end 35a and a small opening area at the front end 35b. When the wedge portion 32 is completely inserted into the frame portion 35, the rear end 32c and the front end 32d of the wedge portion 32
Are set to have such lengths as to slightly protrude from the rear end 35a and the front end 35b of the frame portion 35, respectively.

Next, the operation of the chucking device H will be described with reference to FIG. 8. The wedge portion 32 inserted into the frame portion 35 from the rear end 35a is slightly pulled out to the left in the drawing. A gap is formed between the lower surface 32a of the wedge portion 32 and the upper surface 34a of the base portion 34, and the leading end Wa of the wire W is inserted into the gap from the right in the drawing to the vicinity of the rear end of the base portion 34.

Next, after the wedge portion 32 is slid to the right in the direction opposite to the insertion direction of the tip attaching portion Wa,
If the rear end 32c of the wedge portion 32 is lightly hammered into the frame portion 35 with a hammer or the like, the wedge effect is generated between the upper surface 34a of the base portion 34 and the lower surface 32a of the wedge portion 32. At the same time, the wedge portion 32 maintains the current state (the state of holding and holding the wire) due to the frictional resistance between the upper surface 34a of the base portion 34 and the back surface of the upper surface wall 37 of the frame portion 35. Have been. Thus, if the right in the figure rotates the winding drum D, the chucking apparatus H by pulling the wire W is moved leftward in pullout force of more pull-out resistance of the die C _1, drawing of the wire W It can be performed.

[0009]

However, if the chucking device H does not have a wedge effect that can withstand the pulling force, the leading end Wa of the wire W will fall out of the chucking device H. Therefore, the wedge portion 32 is driven with a hammer or the like. If the driving force of the wedge portion 32 is too weak, the wedge effect is not effective, and the leading portion Wa comes off immediately, and conversely, the driving force of the wedge portion 32 is strong. If it is too good, it becomes difficult to remove the wedge portion 32 from the frame portion 35.

[0010] Further, the leading end W of the wire W once clamped.
The cause of a coming off from the chucking device H is the loosening of the tow chain G at the time of starting the drawing. That is, at the time of starting the drawing of the wire drawing, as shown in FIG. 6, the tow chain G is in a loose state, and only the chuck body 33 moves to the right from this state, and the wire W and the wedge portion 32 remain as they are. In the position of the chuck body 33
A gap may be generated between the wire W and the wedge 32, and the leading end Wa of the wire W may fall out of the chucking device H.

Therefore, in order to prevent the leading end Wa from coming off, at the beginning of the pulling of the wire W, the operator rotates the winding drum D while holding down the wedge portion 32 by hand so as not to be pulled out. I have. As a result, when the chucking device H is pulled in a state where the wire W is normally clamped,
Since the leftward tension acts on the chuck body 33 and the rightward tension acts on the wedge portion 32 and the wire W, the wedge effect is increased, and the leading end Wa of the wire W does not come off the chucking device H.

However, in this case, a hand is to be attached to the rotating winding drum D, so that a finger is caught between the winding drum D and the towing chain G, or the pressing of the hand is released. At that time, the wedge portion 32 and the chuck body 33 were dangerous because their hands and face were hit. Further, if the wedge portion 32 comes off, the work is redone, so that there is a problem that the work efficiency is reduced.

[0013]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and provides an elastic force to a wedge portion so as to enhance its function. While having a strong wire pinching effect by elastic force,
It is an object of the present invention to provide a device capable of easily releasing the pinching of a wire rod, and the gist of the invention is to rotate a wire rod held by a chucking device fixed to a winding drum from a die by rotating the winding drum. In a wire drawing device configured to be pulled out, a chuck body fixed to the winding drum via a pulling chain, and a wedge portion that can be inserted into and removed from the frame of the chuck body from the winding drum side. A compression-type coil spring for urging the wedge portion in the die direction, wherein the wedge portion urged by the coil spring and the chuck body are formed so as to clamp the starting end of the wire rod. In the wire chucking device of the wire device.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the embodiments shown in FIGS.
Is a chucking device that clamps and holds the starting end of the wire W. The chucking device 8 includes a wedge portion 9, a chuck body 10 that receives the wedge portion 9, and a pulling chain that pulls the chuck body 10. 11 mainly.

The wedge portion 9 has a lower surface 9a formed in a horizontal plane, while an upper surface 9b is formed as an inclined surface descending from a rear end 9c toward a front end 9d at a predetermined angle. Further, inside the wedge portion 9, there is formed a cylindrical hole 13 into which a compression coil spring 12 of a predetermined length is inserted from the rear end 9c to the vicinity of the front end 9d. On the walls 9e, 9e, an elongated hole 14 shorter than the cylindrical hole 13 is opened at a position parallel to the cylindrical hole 13. In the figure, reference numeral 15 denotes an operation knob protruding from the rear end 9c of the upper surface 9b of the wedge portion 9.

The chuck body 10 includes a base portion 16 slightly wider than the wedge portion 9 and longer than a longitudinal length thereof, and a gate-shaped frame portion 17 fixed on the base portion 16. It is configured. Here, the upper surface 16a of the base portion 16 is a horizontal surface, but the lower surface 16b is preferably formed in an arc shape so as to be in close contact with the outer peripheral surface of the winding drum D.

As described above, the lower surface 16b of the base portion 16
Is formed into an arc shape, more specifically, an arc shape having substantially the same curvature as the winding drum D, so that the lower surface 16b of the base portion 16 is in close contact with the outer peripheral surface of the winding drum D, and It is possible to prevent the chuck body 10 from rattling with the drum D and to prevent the holding state of the wire W from being carelessly released or broken.
However, the object of the present invention can be achieved even when the lower surface 16b of the base portion 16 has a planar shape parallel to the upper surface 16a.

On the other hand, the frame portion 17 has left and right side walls 17.
a, 17a, and an upper surface wall 17b inclined at the same angle as the inclined surface of the wedge portion 9;
The lower edges of 7a and 17a are fixed to the side surface of the base portion 16 in a horizontal state. Therefore, the frame portion 17 has a large opening area on the rear end 17c side, and the front end side 17d
Has a smaller opening area.

When the wedge portion 9 is completely inserted into the frame portion 17, the rear end 9c and the front end 9d of the wedge portion 9 are formed.
Are set to lengths slightly projecting from the rear end 17c and the front end 17d of the frame 17, respectively. Further, insertion holes 19 for inserting the stop pins 18 of the coil spring 12 are formed in the left and right side walls 17a, 17a of the frame portion 17. One end of the towed chain 11 is a rear end of the base portion 16, that is, a rear end 17c of the frame portion 17.
The other end is fixed to the peripheral surface of the winding drum D.

Next, the assembling of the chucking device 8 composed of the components shown in FIG. 2 will be described with reference to FIG. 3. First, as shown in FIG. The wedge portion 9 is inserted into the frame portion 17 from its front end 9d through a large opening on the rear end 17c side of 17. At this time, the compression coil spring 12 is inserted in the cylindrical hole 13 of the wedge portion 9 in advance. Next, as shown in FIG. 4B, the wedge portion 9 is inserted until the upper surface 9b of the wedge portion 9 comes into close contact with the back surface of the upper wall 17b of the frame portion 17.

As a result, the front end 9d of the wedge portion 9 projects from the small opening on the front end 17d side of the frame portion 17. The insertion holes 19 formed in the left and right side walls 17 a of the frame portion 17 correspond to the cylindrical holes 13 through the elongated holes 14 formed in the wedge portion 9. On this occasion,
The rear end of the coil spring 12 is located to the left from the position of the insertion hole 19 in the drawing.

Therefore, as shown in FIG. 3 (c), the rear end of the coil spring 12 installed in the cylindrical hole 13 of the wedge portion 9 is pressed forward from the position of the insertion hole 19 to be compressed. Thereafter, when the stop pin 18 is inserted into the insertion hole 19 to release the compressive force of the coil spring 12, the rear end of the restored coil spring 12 is locked by the stop pin 18, and the coil spring 12 is restored. The wedge portion 9 is always urged by the force in the direction of the small opening at the front end 17d of the frame portion 17, and is assembled in a state shown in FIG.

Next, the operation of the chucking device 8 will be described with reference to FIG. 4. First, as shown in FIG.
7, the coil spring 12 is compressed when a gap is formed between the lower surface 9a of the wedge portion 9 and the upper surface 16a of the base portion 16. Then, the leading end Wa of the wire W is inserted into the gap from the right side in the drawing to near the rear end of the base portion 16.

Next, as shown in FIG. 4B, when the wedge portion 9 is released from the knob 15 of the wedge portion 9 and the retraction force of the wedge portion 9 is released, the wedge portion 9 is released by the restoring force of the coil spring 12. The wire W is slid in the right direction opposite to the insertion direction of the wire W to automatically sandwich and hold the wire W between the upper surface 16a of the base portion 16 and the lower surface 9a of the wedge portion 9.

When the winding drum D is rotated right in the figure, the chuck body 10 moves to the left via the pulling chain 11. At this time, the wedge portion 9 is
Since the crimped retaining always wire W on the upper surface 16a of the base portion 16 by a wire rod W is divided pulled by pulling force of more pull-out resistance of the die C ₁ to perform the drawing.

Further, the wire W
In order to remove the front end Wa of the wedge portion, the knob 15 of the wedge portion 9 is lightly tapped with a hammer or the like in a reverse direction (toward the rear end 9c of the wedge portion 9), and then the wedge portion 9 is manually retracted to manually retract the wedge portion 9 9 to the upper surface 16a of the base portion 16.
If the wire W is further separated, the leading end portion Wa of the wire W can be easily pulled out. At this time, since the wedge portion 9 is not strongly driven, the wedge portion 9 can be easily retracted.

Further, when replacing the coil spring 12 according to the wire diameter and hardness of the wire W, it can be easily performed by removing the retaining pin 18. By selecting the wire diameter and the hardness of the coil spring 12, a reliable wedge effect can be given to a wire having any wire diameter. For example, by using a strong coil spring in the case of a thick wire and a weak coil spring in the case of a wire having a small diameter, an appropriate wedge effect according to the wire diameter of the wire can be provided. In the above-described embodiment, only one coil spring 12 is used, but two coil springs may be used in parallel to increase the compression force.

[0028]

Since the wire rod chucking device of the wire drawing apparatus according to the present invention has the above-described configuration, the wire rod inserted into the gap between the wedge portion and the chuck body has the wedge portion having a restoring force of the coil spring. , The wedge portion is firmly held by the wedge effect of the wedge portion on the chuck body, and at the same time, this holding state is maintained.
Therefore, the work of hammering the wedge portion with a hammer is not required, and it is not necessary to support the wedge portion by hand.
Dangerous work can be avoided, and when removing the pinched wire rod, the wedge portion can be easily removed because it is not hammered in with a hammer or the like, further improving work efficiency.

Further, the lower surface of the chuck body is formed in an arc shape that is in close contact with the outer peripheral surface of the winding drum, so that the lower surface of the chuck body is in close contact with the outer peripheral surface of the winding drum. The rattling of the chuck body with respect to the drum is eliminated. Therefore, there is an advantage that the holding state of the wire is not inadvertently released or the wire is disconnected, and it is possible to prevent a reduction in work efficiency due to a redo or the like.

[Brief description of the drawings]

FIG. 1 is a perspective view of a chucking device according to the present invention in a state where a wire is sandwiched.

FIG. 2 is an exploded perspective view of the chucking device.

FIG. 3 is an explanatory view for assembling the chucking device.

FIG. 4 is an operation explanatory view of the chucking device.

FIG. 5 is a schematic configuration diagram of a drawing and drawing apparatus.

FIG. 6 is an enlarged partial view of the drawing and drawing apparatus.

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

FIG. 8 is an operation explanatory side view in which a part of the chucking device is cut away.

[Explanation of symbols]

 Reference Signs List 8 chucking device 9 wedge portion 10 chuck body 11 towing chain 12 coil spring 16 base portion 16a lower surface 17 frame body D winding drum W wire rod Wa tipping portion

Continuation of the front page (72) Inventor Yutaka Nakata 3-10-15, Yawata-cho, Shinminato-shi, Toyama F-term (reference) 4N092 FA41 GA05 GA18

Claims (3)

[Claims] 1. A wire drawing device configured to pull out a wire material held by a chucking device fixed to a winding drum from a die by rotation of the winding drum. A chuck body fixed to the chuck body, a wedge portion that can be inserted into and removed from the frame body of the chuck body from the winding drum side, and a compression-type coil spring that biases the wedge portion in the die direction. A wire rod chucking device for a wire drawing device, wherein a starting end of a wire rod is formed between the wedge portion biased by a coil spring and the chuck body. 2. The wire rod chucking device for a wire drawing device according to claim 1, wherein the compression type coil spring is installed in a cylindrical hole of the wedge portion. 3. The wire rod chucking device for a wire drawing device according to claim 1, wherein a lower surface of the chuck body is formed in an arc shape that is in close contact with an outer peripheral surface of the winding drum.