JPH02238302A - Method for measuring length of coated electric wire - Google Patents

Abstract

PURPOSE:To accurately measure the length of an electric wire by grasping the coated electric wire corrected by a correction device by a pair of feed-in rollers and reversing both rollers to pull back the coated electric wire. CONSTITUTION:A correction device 1 removes the habit of the electric wire L passing between the correction rollers 2 of said correction device 1 to correct said electric wire L into a straight line shape. A feed-in roller 4 and a drawing- out roller 8 advance the electric wire L grasped therebetween by forward rotation or retract the same by a reversal. Both rollers 4, 8 are respectively driven rotationally by pulse motors not shown in a drawing to select the feed direction of the electric wire L by the forward and reversal rotation of the motors and the feed quantity of the electric wire L is measured on the basis of the rotary quantities of the respective motors. By this method, the length of a coated electric wire can be accurately measured and treatment can be performed by inexpensive equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for measuring the length of coated wires used for wiring in various electrical devices.

[Prior Art] Conventionally, this type of sub-length method involves sandwiching a covered wire between a pair of feed rollers rotationally driven by a pulse motor.
These rollers are simply rotated in the normal direction to feed the wire, and the length of the wire is measured based on the rotational speed of the rollers. Many of the coated wires whose length is to be measured have curls, and the wires are held and straightened in a complex manner between a number of straightening rollers of a straightener before being measured in length by a feeding row.

[Problems to be Solved by the Invention] However, in the above-mentioned length measuring method, the feed roller needs to pull out the covered wire against the resistance of the straightener and increase its length. When the infeed roller starts up, slippage may occur between the opening roller and the wire. In this case, even though the feed roller is rotated by a predetermined amount, the wire is not actually fed by the corresponding amount, making it difficult to accurately measure the length of the covered wire. The problem arises that it cannot be done.

Therefore, in order to prevent slippage between the feed roller and the covered wire, it is conceivable to loosen the supporting force of each of the straightening rollers to make it easier to pull out the wire from the straightener. It becomes impossible to correct the problem adequately. It is also conceivable to increase the pressure with which the feed roller supports the covered wire for the same purpose, but if this is done, the wire will be crushed.

On the other hand, a pull-out device for pulling out the covered wire from the straightener is provided between the straightener and the feed roller, and the feed roller only plays the role of feeding the loosened wire that has been pulled out by the pull-out device to the cutting blade. Sometimes it is done. However, by providing the pull-out device, there arises a problem that the installation cost for carrying out the series of processes described above becomes high, and the product price of the covered electric wire becomes high.

The purpose of the present invention is to prevent slippage between the covered wire and the feed roller, to accurately measure the length of the covered wire, and to
It is an object of the present invention to provide a method for sub-lengthing a covered electric wire, which allows this process to be carried out using inexpensive equipment.

[Means for Solving the Problems] The present invention supports a wire to be ril that has been straightened by a straightener with a pair of feed rollers, and also reverses the double-ended rollers to pull back the coated wire and connects the wire with the feed roller. The process of loosening the wire between the straightening device and the step of rotating the feed roller in the normal direction and measuring the length of the covered wire based on the rotating suspension of the feed roller. The gist is the length measurement method.

[Function] Since slack is formed in the coated wire between the feed roller and the straightener in advance, there is no need to pull out the wire from the straightener during sub-lengthening. Therefore, there is no slippage between the feed roller and the wire due to resistance when pulling out the covered wire from the straightener, and the length of the wire can be measured accurately.

[Embodiments] Hereinafter, embodiments embodying the present invention will be described with reference to the drawings.

First, a cutting/stripping device for carrying out the method for measuring the length of a covered electric wire according to the present embodiment and the state of the covered electric wire preset in the device will be explained. This cutting/stripping device sequentially measures the length of N long electric wires L wound around a winding wheel (not shown) and cuts them to a predetermined length, and also measures the lengths of both ends of each electric wire L in the same manner and peels them. , the terminal t is crimped onto one of the exposed core wires C.

As shown in FIG. 1.2, the coated wire from the winding wheel is supported by a number of straightening rollers 2 of the straightener 1, and its front end passes through the first guide tube 3 and then passes through the feed roller 4. is supported by The front end of the covered wire L passes through the second guide tube 5 and is inserted between a pair of cutting blades 6, and the front end of the wire L passes through the third guide tube 7 and is inserted into the feed roller 4. It is supported by a pair of pull-out rollers 8.

The straightener 1 is used to straighten the electric wire L passing between the straightening opening and the wire 2 into a straight line by removing its curl. Also,
The feed roller 4 and the pull-out roller 8 move the supported lightning wire L forward as it rotates in the normal direction or retreat as it rotates in the reverse direction.

Both rollers 4 and 8 are rotationally driven by pulse motors (not shown), and the feeding direction of the electric wire L is selected by forward and reverse rotation of each motor, and the direction of feeding of the electric wire L is selected based on the amount of rotation of the motor. It is designed to measure the length of the send. Note that the first to third guide tubes 3
, 5.7 play the role of guiding the front end of the electric wire L, respectively.

Further, the cutting blade 6 can cut the covered wire L between them, as shown in FIG. 3(d), or make a cut without cutting the wire L, as shown in FIG. 3(a). You can add. Then, when the electric wire L cut by the cutting blade 6 is retreated by the feed roller 4, as shown in FIG.
As shown in C), the area is completely peeled to expose the inner core wire C, or as shown in Figure 3(b), only the middle part of the core wire C is exposed without being completely peeled off. You can

Further, as shown in FIG. 2, a crimping machine 9 is provided next to the cutting blade 6 for crimping a paneel t to the front end of the electric wire L, and a crimping machine 9 is provided next to the cutting blade 6, and a crimping machine 9 is provided for crimping the paneel t to the front end of the electric wire L. tube 3
．． 5 maintain their mutual positional relationship, and the cutting position is such that the front end of the second guide tube 3 faces the cutting blade 6, as shown by the solid line in FIG. As shown by the line, the front end of the second guide tube 3 is slid between two positions: a crimping position where the front end of the second guide tube 3 faces the pressure @II9.

Next, using the cutting and peeling device configured as above,
A covered electric wire with a length of 100mm and 3III1 core wires C exposed at both ends! l! The case where aL1 is manufactured from the electric wire L will be explained with reference to FIG. It is assumed that members such as the feed roller 4 are in the cutting position at the start of the work.

First, the coated wire L in the position shown in FIG. 4(a) is measured by a pulse motor and both rollers 4.8 are rotated in the normal direction, as shown in FIG.
advance. Thereafter, as shown in FIG. 4(C), when both the rollers 4 and 8 are reversed and the electric wire L is retreated by the same amount of <15 ml, a slack in the electric wire L is formed between the feeding roller 4 and the straightener 1. Ru. Next, close the cutting blade 6 and cut the M electric wire L.
, and the separated electric wire L on the front end side is used as a waste m.

Next, as shown in FIG. 4(d), the draw-out roller 8 is rotated in the normal direction to discharge the waste material m from the roller 8. At the same time, the feed roller 4 is rotated forward to advance the covered wire L, and its front end is inserted between the cutting blades 6 by 3 mm.
The cutting blade 6 bits the electric wire L to make a cut. When the covered electric wire L is advanced in this manner, there is a slack formed at the rear thereof, so there is no need to extend the electric wire L from the straightener 1. Then, as shown in FIG. 4(e), when the feed roller 4 is reversed to move the rIi electric wire L back by 3 mm while it is in the jammed state, the front end of the electric wire L is peeled and the core wire C inside it is stripped by 3 mm. can be exposed.

Thereafter, as shown in FIG. 4(f), the feed roller 4
When the wire is slid to the crimping position, the front end of the covered electric wire L faces the crimping machine 9. At this time, it is necessary for the feed roller 4 to feed the wire L by a predetermined length while measuring the length of the wire L for terminal crimping. There is no need to extract it from

Then, the terminal t is crimped onto the core wire C using the crimping machine 9, and the fourth
As shown in Figure (0), the feed roller 4 is again slid to the cutting position.

Next, as shown in FIG. 4(h), the feed roller 4 is rotated in the normal direction to advance the electric wire L to the draw-out port 8, and the electric wire L is rotated in the normal direction by the normal rotation of both rollers 4 and 8.
Advance 15lIIIl1. That is, the front end of the electric wire L will be 115 mm away from the cutting blade 6.

Then, as shown in FIG. 4 (+), both rollers 4.8 are reversed to move the electric wire L back by 15 ils, and this electric wire L is cut by the cutting blade 6 to cut the electric wire 100 mm long on the front end side into 11 ils. shall be. Next, as shown in FIG. 4(j), as in the case described above, the feed roller 4 is rotated in the normal direction to advance the covered electric wire [, and its front end is inserted between the cutting blades 6 by 3IIllIl, and Pull out the covered wire L1 on the front end side so as not to interfere with the forward movement of the roller 8.
3lillI1 or more at . In this case as well, as in the case described above, since slack is formed at the rear of the covered electric wire L when it is advanced, there is no need to pull out the electric wire L from the straightener 1. Then, a cut is made at the front end of the L portion of the covered wire using the cutting blade 6, as shown in Fig. 4-(k).
As shown in the figure, when the electric wire L is moved back by 3 mm, the front end of the electric wire L is peeled off, and the core wire C inside thereof can be exposed by 3 mm.

Thereafter, as explained in accordance with FIGS. 4(f) and (a), the feed roller 4 is slid to the crimping position, the terminal t is crimped onto the exposed core wire C with the pressure tube I19, and the feed roller 4 is moved again. Return to cutting position. On the other hand, while the terminal t is being crimped onto the insulated wire, as shown in FIG. 6
At the same time, the cutting blade 6 makes a cut, and as shown in FIG. to expose 3mm of the internal core wire C. Furthermore, this fourth
The reason why the front end of the covered wire L is shown broken in Figures ( ) and (m) is that this front end is in the crimping position for crimping the terminal t.

Next, as shown in FIG. 4(n), the covered wire L1 is advanced and discharged by the pull-out roller 8.

On the other hand, as described above, the feed roller 4 returns to the cutting position while holding the wire L to which the terminal t is crimped, and the entire apparatus returns to the state shown in FIG. 4(g).

4(g) to 4(n).
By repeating the steps up to this point, the electric wires L1 are sequentially manufactured from the covered electric wire L in the same manner as described above.

In this way, according to the method for measuring the length of a coated wire according to this embodiment, the feed roller 4 is reversed in advance, and the roller 4 and the straightener 1 are
Since a slack is formed in the electric wire L located between the wire and the wire, there is no need to pull out the electric wire L from the ship straightener 1 when moving the covered electric wire L forward while measuring the length with the feed roller 4. Therefore, it is possible to prevent slippage between the feed roller 4 and the covered electric wire L caused by the resistance of the straightener 1, and it is possible to accurately measure the length of the electric wire L to be measured. Therefore, it is possible to accurately expose the core wire C by a regular dimension, and to accurately crimp the terminal t at a regular position.

Further, the method of sub-lengthening the coated wire of this embodiment can be carried out using a conventional cutting and stripping device as described above. Therefore, it is possible to provide 11 coated wires at a low price.

In addition, in the method for measuring the length of a covered wire in this Miura example, the sub-length was performed for cutting and stripping the covered wire L and crimping the terminal T, but the purpose of length measurement is not limited to this, and can be used for any purpose. The sub-length method of the present invention can be applied to the length measurement of.

[Effects of the Invention] As detailed above, according to the method for measuring the length of a covered electric wire of the present invention, slippage between the covered electric wire and the feeding roller can be prevented, and the length of the covered electric wire can be accurately measured. Moreover, it has the excellent effect of being able to carry out this treatment with inexpensive equipment.

[Brief explanation of drawings]

FIG. 1 is a schematic partial front view showing the cutting/peeling device of this embodiment, FIG. 2 is a schematic partial plan view, and FIGS.
d) is a partially enlarged front view showing a state in which various processes have been applied to the electric wire by the cutting blade, and FIGS. 4(a) to 4(n) are explanatory diagrams showing the processing procedure of the electric wire by the cutting/stripping device. 1 is a straightener, 4 is a feed roller, and 4 is a covered electric wire. Patent applicant: Kodera Denshi Seisakusho Co., Ltd. Representative: Hironobu Onda, Patent attorney Voluntary procedure proceedings June 9, 1999

Claims (1)

[Claims] 1. The coated wire (L) that has been straightened by the straightener (1) is held between a pair of feed rollers (4), and both rollers (4) are reversely rotated to remove the coated wire (L). ) to loosen the electric wire (L) between the feed roller (4) and the straightener (1);
A method for measuring the length of a covered electric wire, comprising the step of measuring the length of the covered electric wire (L) based on the amount of rotation.