JPH10236733A - Wire feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a deflection amount of a wire between rollers smaller. SOLUTION: A feed roller 1 for feeding a wire W by a prescribed length and a pre-feed roller 2 for supplying the wire W relating to this feed roller 1 are provided. Between both the rollers 1, 2, a wire pool part 3 deflecting the wire W is provided. In the pool part 3, an upper/lower limit sensor 4, 5 each corresponding to an upper/lower limit position of the lowest point of the wire W and an intermediate sensor 6 positioned between these sensors 4, 5 are arranged. When the wire W is fed, normally both the rollers 1, 2 are rotated at an equal peripheral speed, also in the case of the upper limit sensor 4 detecting the wire W, operation of both the rollers 1, 2 is stopped. In case of the intermediate sensor 6 detecting the wire W, a rotational speed of the pre-feed roller 2 is increased, in case of the lower limit sensor 5 detecting the wire W, a rotational speed of the pre-feed roller 2 is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire feeder provided with a feed roller for feeding electric wires by a predetermined length and a pre-feed roller for supplying electric wires to the feed rollers. The present invention relates to an electric wire feeder in which the control of the amount of electric wire deflection between both rollers is improved.

[0002]

2. Description of the Related Art For example, in an electric wire processing in which an electric wire is cut into a predetermined length, and an end portion of the electric wire is sequentially processed such as stripping or crimping of a terminal, an electric wire feeding device capable of feeding the electric wire with high precision. Is required.

[0003] As such an electric wire feeding device, generally,
The one provided with a pair of feed rollers and a pair of pre-feed rollers for feeding an electric wire by pinching and rotating the electric wire is used. Among these, the feed roller is for feeding the electric wire by a predetermined length, and the pre-feed roller is for supplying the electric wire to the feed roller.

[0004] In this case, if the resistance of the electric wire to the feed roller at the time of feeding is large, slippage of the feed roller causes a decrease in accuracy of the feed length of the electric wire. For this reason, an electric wire pool portion is provided between the feed roller and the pre-feed roller to bend the electric wire so as to minimize the pulling resistance of the electric wire.

FIG. 4 shows an example of such a conventional wire feeder. The conventional electric wire feeding device shown in FIG.
The electric wire processing apparatus M includes a pair of feed rollers 1 ′ provided at an electric wire introduction portion F of the electric wire processing device M and a pair of pre-feed rollers 2 ′ provided upstream of the electric wire W in the feed direction.
Further, between the feed roller 1 ′ and the pre-feed roller 2 ′, the above-described wire pool section 40 is provided.

In this electric wire feeder, the electric wire W drawn upward from the electric wire tobacco W 'is turned in the horizontal direction by the guide roller 8, passed through the strainer 24, and then pre-feeded. It is adapted to be introduced into the roller 2 '. Further, the electric wire W sent out from the pre-feed roller 2 ′ is once bent downward by the electric wire pool part 40, then turned in the horizontal direction again by the guide roller 9, and introduced into the feed roller 1 ′. It has become.

Here, the electric wire pool section 40 is provided with a weight roller R for applying a constant tension to the electric wire W to secure the electric wire W to be vertically movable. In order to detect the amount of bending of the electric wire W, the electric wire pool portion 40 includes an upper limit sensor 42 and a lower limit sensor 42 corresponding to the upper limit position and the lower limit position of the weight roller R (the lowest point of the electric wire W), respectively. 44 are provided.

In this electric wire feeding apparatus, when the electric wire is fed, first, the rotation of the feed roller 1 'causes the pool portion 4 to rotate.
The electric wire W is sent out from 0, and the weight roller R rises as the bending of the electric wire W in the pool portion 40 decreases. When the upper limit sensor 42 detects that the weight roller R has reached the upper limit position, the rotation of the pre-feed roller 2 'is started, and the weight roller R descends with the increase in the bending of the electric wire W in the pool portion 40. Go.
When the lower limit sensor 44 detects that the weight roller R has reached the lower limit position, the operation of the pre-feed roller 2 'is stopped.

[0009]

The above-mentioned conventional wire feeder has the following problems. First,
When the electric wire W is relatively thick and hard, the weight of the weight roller R is made relatively heavy, and when the electric wire W is relatively thin and soft, the weight of the weight roller R is made relatively light. It is necessary to adjust the weight of the weight roller R accordingly.

That is, if the weight of the weight roller R is too light, the weight roller R jumps up every time the electric wire W is sent by the feed roller 1 '. In some cases, the jumped-up weight roller R reaches the upper limit sensor 42, and the operation of the pre-feed roller 2 'causes the electric wire W to be supplied to the electric wire pool portion 40 more than necessary, causing the electric wire W to become entangled. It may be.

On the other hand, if the weight of the weight roller R is too heavy, the resistance of the electric wire W to the feed roller 1 'increases due to an increase in the tension of the electric wire W, and the feed roller 1'
The slippage of the wire W may cause a decrease in the precision of the feed length of the wire W, and the wire W may be bent by the weight roller R.

When a long wire is fed at a time, the amount of bending of the wire W during feeding is not reduced.
It is necessary to ensure the amount of bending of the electric wire W of the pool portion 40 as large as possible. Therefore, it is necessary to increase the size of the entire electric wire feeding device accordingly. The present invention has been made in view of such a point, so that the amount of bending of the electric wire between the feed roller and the pre-feed roller can be smaller than in the past, and the need to use a weight roller is eliminated. It is another object of the present invention to provide an electric wire feeding device capable of reducing the size of the entire device as compared with the related art.

[0013]

SUMMARY OF THE INVENTION The present invention relates to a pair of rollers for feeding an electric wire by pinching and rotating the electric wire, the feed roller for feeding the electric wire by a predetermined length, and a feed roller for feeding the electric wire. A pre-feed roller for supplying electric wires to the feed roller, and three sensors for detecting the amount of bending of the electric wire between the feed roller and the pre-feed roller, the upper limit position and the lower limit of the lowest point of the electric wire. Upper limit sensor and lower limit sensor disposed corresponding to each position, an intermediate sensor disposed between these upper limit sensor and lower limit sensor, and control for controlling the operation of the feed roller and the pre-feed roller Means, the control means, when feeding the electric wire, usually rotates the feed roller and the pre-feed roller at the same peripheral speed When the upper limit sensor detects an electric wire, the operation of the feed roller and the pre-feed roller is stopped, and when the intermediate sensor detects the electric wire, the rotation speed of the pre-feed roller is increased, and the lower limit sensor is An electric wire feeding device characterized in that when an electric wire is detected, the rotation speed of the pre-feed roller is reduced.

According to the present invention, even when the feed roller and the pre-feed roller are rotated at the same peripheral speed during the feeding of the electric wire, the slip due to the resistance of the electric wire is usually larger on the pre-feed roller side, so that The amount of deflection gradually decreases. However, according to the present invention, the decrease in the amount of bending of the electric wire can be quickly detected by the intermediate sensor, and the amount of bending of the electric wire can be compensated for by increasing the rotation speed of the pre-feed roller.

When the amount of deflection of the wire increases and the lowest point of the wire reaches its lower limit position and is detected by the lower limit sensor, the rotation speed of the pre-feed roller lowers and the lowest point of the wire moves to the lower limit position. Is prevented.

When the lowest point of the electric wire exceeds the position of the intermediate sensor for some reason and the upper limit sensor detects the electric wire, the operation of the feed roller and the pre-feed roller is stopped, so that the necessary bending of the electric wire is prevented. It is possible to prevent a situation in which the supply of the electric wire is performed while the electric wire is lost.

According to the above, the electric wire can be fed between the feed roller and the pre-feed roller while correcting the amount of the electric wire deflection. Regardless of the length of the wire to be fed, it is possible to feed the wire accurately and stably.

In the present invention, it is preferable that the control means activates only the pre-feed roller each time the feeding of the electric wire is completed, until the lower limit sensor detects the electric wire. By doing this,
The next wire feeding can be started from a state where the amount of bending of the wire is always replenished to the maximum.

In the present invention, there is provided an electric wire guide provided at an inlet side of the feed roller and an outlet side of the pre-feed roller, and having a guide hole for passing an electric wire,
It is preferable to further include an electric wire guide that can swing in accordance with the bending of the electric wire between the feed roller and the pre-feed roller. By doing so, it is possible to more smoothly feed the electric wire between the feed roller and the pre-feed roller.

[0020]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 3 are views showing an embodiment of an electric wire feeding device according to the present invention. In the embodiment of the present invention shown in FIGS. 1 to 3, the same components as those in the conventional example shown in FIG.

In FIG. 1, the electric wire feeding device includes a pair of feed rollers 1 and a pair of pre-feed rollers 2 for feeding the electric wire W by holding and rotating the electric wire W.
Among them, the feed roller 1 is for feeding the electric wire W to a processing device or the like by a predetermined length, and the pre-feed roller 2 is for supplying the electric wire W to the feed roller 1. Further, between the feed roller 1 and the pre-feed roller 2, an electric wire pool portion 3 for bending the electric wire W is provided.

In this electric wire feeding device, the electric wire W drawn upward from the electric wire tobacco W 'is turned in the horizontal direction by the guide roller 8 to correct the bending habit of the electric wire W. After passing through a strainer 24 composed of a plurality of rollers 26, it is introduced into a pre-feed roller 2 '. Also, a pre-feed roller 2 '
The wire W sent out of the pool 1 is once bent downward in the pool section 3 and then introduced into the feed roller 1.

Here, the electric wire pool portion 3 has an electric wire W
Slit plate 30 arranged substantially at right angles to the feed direction of
Is provided. The slit plate 30 has a vertically long slit 32 through which the electric wire W passes. In addition, the wire pool section 3 includes a feed roller 1
Three sets of sensors 4, 5, 6 for detecting the amount of bending of the electric wire W in the middle between the pre-feed roller 2 and
A pair of upper limit sensor 4, lower limit sensor 5, and intermediate sensor 6, which are opposed to each other with the slit 32 of the slit plate 30 interposed therebetween, are provided.

Among them, the upper limit sensor 4 and the lower limit sensor 5
Are arranged corresponding to the upper and lower limit positions of the lowest point of the electric wire W, respectively. Here, as the upper limit position of the lowest point of the electric wire W detected by the upper limit sensor 4, for example, as shown in FIG. 2, a position where the electric wire W becomes closer to a straight line is set. Further, the intermediate sensor 6 is provided between the upper limit sensor 4 and the lower limit sensor 5. In addition, each sensor 4, 5,
Reference numeral 6 denotes a light-transmitting sensor that detects the electric wire W by blocking the optical axis with the electric wire W, for example.

Next, as shown in FIGS. 1 and 2, electric wire guides 12, 22 having guide holes 13, 23 for passing electric wires W on the inlet side of the feed roller 1 and the outlet side of the pre-feed roller 2, respectively. Is provided. These electric wire guides 12 and 22 are attached to a base portion 10 supporting the feed roller 1 and a base portion 20 supporting the pre-feed roller 2 and the like so as to be vertically swingable.

Then, these wire guides 12 and 22
Are biased toward the positions as shown in FIG. 1 by their own weight or spring force, and swing in response to the bending of the electric wire W between the feed roller 1 and the pre-feed roller 2. It has become. That is, as shown in FIG. 2, when the electric wire W approaches a linear shape with a decrease in the bending thereof, the electric wire guides 12 and 22 also swing upward correspondingly to approach the horizontal position. ing.

Here, the electric wire feeding device is provided with control means (not shown) for controlling the operation, stop and rotation speed of the feed roller 1 and the pre-feed roller 2.
The control means normally rotates the feed roller 1 and the pre-feed roller 2 at the same peripheral speed (when the outer diameters of the two are equal, the same rotation speed) when feeding the electric wire W. At the same time, control as shown in the flowchart of FIG. 3 is performed.

In FIG. 3, first, in step 100, the operation of the feed roller 1 and the pre-feed roller 2 is started to feed the electric wire W (feed). Thereafter, the following control is performed until the feeding of the predetermined amount (length) of the electric wire W is completed in step 107.

That is, first, in step 101,
When the upper limit sensor 4 detects the electric wire W, it determines that there is an abnormality and stops the operation of the feed roller 1 and the pre-feed roller 2 (step 102). When the intermediate sensor 6 detects the electric wire W in step 103, the rotation speed of the pre-feed roller 2 is increased. Step 105
, When the lower limit sensor 5 detects the electric wire W, the rotation speed of the pre-feed roller 2 is reduced (step 1).
06).

Next, when the feeding of the predetermined amount of the electric wire W is completed in Step 107, the rotation of the feed roller 1 is stopped (Step 108), and the pre-feed roller is rotated until the lower limit sensor 5 detects the electric wire W (Step 110). Execute replenishment pre-feed that activates only 2 (step 1)
09). When the lower limit sensor 5 detects the electric wire W in step 110, the rotation of the pre-feed roller 2 is stopped (step 111).

The electric wire feeding device is configured to supply the electric wire W to the electric wire processing device or the like by a predetermined length while repeating the above control.

Next, the operation of the present embodiment having such a configuration will be described. In this embodiment, even when the feed roller 1 and the pre-feed roller 2 are rotated at the same peripheral speed during the feeding of the electric wire W, the slip due to the resistance of the electric wire W is usually larger on the pre-feed roller side, The amount of bending of the electric wire W gradually decreases. However,
According to the present embodiment, the decrease in the amount of bending of the electric wire W can be quickly detected by the intermediate sensor 6, and the amount of bending of the electric wire W can be compensated for by increasing the rotation speed of the pre-feed roller 2.

Then, the amount of bending of the electric wire W increases, and the electric wire W
Reaches the lower limit position and is detected by the lower limit sensor 5, the lowering of the rotation speed of the pre-feed roller 2 prevents the lowest point of the electric wire W from exceeding the lower limit position.

If the lowest point of the electric wire W exceeds the position of the intermediate sensor 6 and the upper limit sensor 4 detects the electric wire W for some reason, the operation of the feed roller 1 and the pre-feed roller 2 is stopped. Necessary electric wire W
Can be prevented from being supplied while the electric wire W is not bent.

As described above, the electric wire W can be fed between the feed roller 1 and the pre-feed roller 2 while correcting the amount of the electric wire W to be bent. At least, the electric wire W to be sent
Irrespective of the length of the wire W, accurate and stable feeding of the electric wire W can be performed.

Each time the feeding of the electric wire W is completed,
Until the lower limit sensor 5 detects the electric wire W, the replenishment pre-feed that operates only the pre-feed roller 8 is executed. You can start paying.

At the inlet side of the feed roller 1 and at the outlet side of the pre-feed roller 2, there are provided wire guides 12, 22 which can swing in response to the bending of the wire W between the rollers 1, 2. Provided, both rollers 1, 2
The feed of the electric wire W between them can be made smooth.

[0038]

As described above, according to the present invention,
Between the feed roller and the pre-feed roller,
Wires can be fed while correcting the amount of wire deflection, so even if the amount of wire deflection is smaller than before, regardless of the length of wires to be fed, accurate and stable wire feeding Can be performed. For this reason, it is not necessary to use a weight roller for securing the bending of the electric wire, and the size of the entire apparatus can be made smaller than before.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of an embodiment of an electric wire feeding device according to the present invention.

FIG. 2 is a diagram showing the electric wire feeding device shown in FIG. 1 in a state when an upper limit sensor is detected.

FIG. 3 is a flowchart showing the contents of operation control of the electric wire feeding device shown in FIG. 1;

FIG. 4 is a schematic view showing an example of a conventional electric wire feeding device.

[Explanation of symbols]

 W wire W 'wire tobacco 1 pair of feed rollers 2 pair of pre-feed rollers 3, 40 wire pool 4 upper limit sensor 5 lower limit sensor 6 intermediate sensor 12, 22 wire guide 24 strainer 30 slit plate 32 slit

Claims (3)

[Claims] 1. A pair of rollers for feeding an electric wire by pinching and rotating the electric wire, the feed roller feeding the electric wire by a predetermined length, and the feed roller feeding the electric wire to the feed roller. A pre-feed roller, and three sensors for detecting the amount of bending of the wire between the feed roller and the pre-feed roller, the sensors being provided corresponding to the upper limit position and the lower limit position of the lowest point of the wire, respectively. An upper limit sensor and a lower limit sensor, an intermediate sensor disposed between the upper limit sensor and the lower limit sensor, and control means for controlling the operation of the feed roller and the pre-feed roller. In feeding electric wires, usually, the feed roller and the pre-feed roller are rotated at the same peripheral speed, and the upper limit When the sensor detects the electric wire, the operation of the feed roller and the pre-feed roller is stopped, and when the intermediate sensor detects the electric wire, the rotation speed of the pre-feed roller is increased, and the lower limit sensor detects the electric wire. In this case, the rotation speed of the pre-feed roller is reduced. 2. The electric wire feeder according to claim 1, wherein the control means activates only the pre-feed roller until the lower limit sensor detects the electric wire each time the electric wire feeding is once completed. Feeding device. 3. An electric wire guide provided at an inlet side of the feed roller and an outlet side of the pre-feed roller and having a guide hole for passing an electric wire, wherein the electric wire guide is provided between the feed roller and the pre-feed roller. The electric wire feeding device according to claim 1 or 2, further comprising an electric wire guide capable of swinging in response to the bending of the electric wire in (1).