JPS62206807A - Winding method - Google Patents

Abstract

PURPOSE:To enable positioning precisely by gripping the tip side of an electric wire into V-shaped grooves for a pair of gripping pawls while positioning these gripping pawls to the hole of a core and leading the electric wire under the state of grip into the V-shaped grooves. CONSTITUTION:An electric wire 7 is lead out of a bobbin 9, passed through a C-shaped hook 11b by the linear motion of a pair of feed-pawls 10 through a guide body 11a and a clamper 12a, and held by a clamper 12b. Pairs of gripping pawls 13 and rollers 18 are shifted up to a section in the vicinity of the bobbin 9 under the state, and the tip section of the electric wire 7 is held loosely in V-shaped griping grooves 14 while a cutter 15 cuts the electric wire 7. A pair of the rollers 18 are turned only by a fixed quantity, and the electric wire 7 is lead into the gripping grooves 14. A pair of the gripping pawls 13 are retreated, and transferred in the rectilinear direction, moved to the other side from one side of a magnetic head 1, and forwarded again, thus guiding an inserting tip for the electric wire 7 up to approximately central position of a hole 8 for a core 4 and stopping it. Accordingly, the electric wire is not lengthened in size more than required, thus accurately positioning the electric wire.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a method for automatically winding thin electrical wires into small holes in a core.

Background of the Invention A head of a video tape recorder, a track slider of a magnetic disk, etc. has a plurality of cores. A small hole for attaching the voltage is formed in the core.
A thin electric wire with a diameter of about 0.03 mm is wound around this hole. This electric wire converts magnetic recording signals into electrical signals when tracing magnetic tapes, magnetic disks, etc.

BACKGROUND ART Conventionally, this wire winding work has been carried out manually while optically enlarging the hole in the core. Due to such manual labor, production efficiency is low and mass production is difficult, making the products extremely expensive. Under these circumstances, automation of this winding work is desired.

By the way, Japanese Unexamined Patent Application Publication No. 148812/1983 discloses that the tip of the electric wire is passed through the hole of the core along with the airflow. In that invention, when inserting the electric wire, the relative positioning of the insertion end of the electric wire and the hole in the core is performed using a TV camera, optical correction control, and numerical control technology. For this reason, the winding device has not yet been put into practical use because of its complicated configuration and high manufacturing cost.

On the other hand, the inventor has proposed, as an alternative to the above-mentioned technique, JP-A-59-48910, JP-A-59-195814, JP-A-59-195815, and JP-A-59-200409.
Completed the invention of No. 4491281 in the United States.
It has been patented as the No. In those inventions, a suction pipe performs vacuum suction from one side of the core to create an air flow in the direction of insertion of the electric wire into the hole in the core, and this air flow allows the insertion end of the electric wire to be inserted into the hole in the core. Then, by rotating the suction pipe together with the internal electric wire, the electric wire is wound around the hole in the core.

In such a winding means, when the amount of winding of the electric wire increases, the suction pipe becomes long, which slows down the rotation speed of the suction pipe, and also induces vibration due to its inertia when the suction pipe stops. There is a limit to speeding up the winding process.

In addition, the invention of International Publication No. WO34100077 is
By cutting the insertion end of the wire before inserting it into the core hole, variations in the tip are eliminated, making wire threading easier and at the same time ensuring recognition through image processing. However, according to the above technique, the wire becomes shorter each time it is wound, so that the length of the wire needs to be longer than the substantial amount of winding at the initial stage of winding. Similarly to the above, this is disadvantageous in terms of speeding up the winding and the wire winding operation.

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to enable accurate positioning of electric wires without cutting their ends.

Solution to the Invention Therefore, the present invention grips the tip side of the electric wire within the figure-7 groove of a pair of gripping claws, positions the gripping claws with respect to the hole in the core, and then removes the wire in the gripped state. By drawing the wire into the figure-7 groove, the insertion end of the wire is brought into exact alignment with approximately the center line of the hole in the core.

Therefore, in the present invention, accurate positioning is possible without making the wire longer than necessary, without cutting the inserted end of the wire, and without performing sophisticated image processing.

Structure of the Invention First, FIG. 1 shows the process sequence of the wire winding method of the present invention. This winding method consists of a positioning and guiding step, an insertion step, and a winding step, and these steps are successively performed for each winding.

Next, FIGS. 2 and 3 show a magnetic helad l to be wound. This magnetic head 1 is made of ultra-small ferrite as a whole, and has a smooth trace surface 2 on one surface, a positioning groove 3 on the other surface, and C on the side of the trace surface 2. It is integrally provided with a letter-shaped core 4.

This core 4 has a C-shape when viewed from the side, and is fixed near the tracing surface 2 by molten glass 6 while forming a gap 5 at the tip, and has a hole 8 for winding an electric wire 7. is forming.

The electric wire 7 is, for example, an enamel-coated wire, and is wound about 15 to 25 times around the outer circumference of the core 4 through the hole 8.
Converts electrical signals to magnetic signals, and vice versa. The actual dimensions of each part are
As shown in the drawing.

4 to 6 show each process.

First, in the first positioning guide step, as shown in FIG. 4, the electric wire 7 is pulled out from the bobbin 9, and
a and the clamper 12a, it is passed through the C-shaped hook llb by the linear movement of the pair of feed claws 10, and further held by the clamper 12b. In this state, the pair of gripping claws 13 and roller 18 move close to the bobbin 9 and approach each other, thereby loosely holding the tip portion of the electric wire 7 inside their V-shaped gripping grooves 14.

At the same time, the cutter 15 cuts the electric wire 7 and separates it from the electric wire 7 of the bobbin 9. In this way, the length of the electric wire 7 necessary for winding is ensured. At this point,
The cut end of the electric wire 7 protrudes from the gripping groove 14 and is not restrained within the length of the protrusion, so the position of the tip is uncertain due to bending or the like. Thereafter, the pair of rollers 18 rotate by a certain amount in the direction of the dotted line in FIG. As a result, the tip of the electric wire 7 on the cut end side protrudes from the inside of the gripping groove 14 by about 1 mm. In this way,
The cut end of the electric wire 7 is restrained by the gripping groove 14, and even if it is bent, it almost coincides with the center line of the hole 8 and is housed within a smaller range than the hole 8. The amount of rotation of the roller 18 at this time can be accurately regulated by a pulse motor or the like. Next, the pair of gripping claws 13 move back, move in a linear direction, move from one side of the magnetic head 1 to the other side, and move forward again to hold the cut or insertion end of the electric wire 7 into the core. 4 to approximately the center of the hole 8, and then stopped at a predetermined position. At this time, the pair of gripping claws 13
is accurately positioned with respect to the core 4, so that the gripped electric wire 7 is located inside the gripping groove 14 and approximately on the center line of the hole 8. Through such a process, the insertion side tip of the electric wire 7 is positioned inside the pair of grip grooves 14, and
is directed toward the center of borehole 8.

In addition, as shown in FIG. 10 and FIG.
It is supported by the head body 16 so as to be able to move forward and backward. Further, the magnetic head 1 is fixed to a rotary table 17, which will be described later, in a positioned manner.

In the subsequent insertion step, as shown in FIG. 5, the tip of the suction pipe 21 approaches the center position of the hole 8 from one side of the core 4 and stops near there. In this state, the suction pipe 21
Since the inside of the hole 8 is in a vacuum state, an air flow is generated in the hole 8 in the direction in which the electric wire 7 is inserted.

This air flow draws in the insertion side end of the electric wire 7, passes through the inside of the hole 8 together with the electric wire 7, and reaches the inside of the suction pipe 21. At this time, the pair of rollers 18 both rotate in the direction of solid lines in the first) figure, and send out the electric wire 7 in the direction in which it passes. During this suction, a hole 8 is inserted into one side of the core 4 from the periphery.
Due to the formation of an air flow that enters the end of the wire 7,
It only needs to be located near the borehole 8, and accurate positioning is not particularly required. In this way, the insertion end of the electric wire 7 passes through the hole 8 of the core 4 due to the airflow caused by vacuum suction. Thereafter, the suction pipe 21 retreats to a predetermined position and stops while the electric wire 7 is frictionally held by the pair of holders 19 at the distal end. During this retreat,
A pair of holders 19 squeeze the electric wire 7 to straighten its bends.

After this, the winding process begins. In this winding step, as shown in FIG.
rotates 360 degrees in the winding direction of the electric wire 7. At this time, the electric wire 7 is pulled completely around the hole 8 only once under moderate tension, as shown in FIGS. 7 to 9. During this winding process, when the rotary table 17 rotates 180 degrees, the wire presser 20 advances from the side of the core 4 and rotates together with the rotary table 17, as shown in FIG.
By holding the wire 7 in a wound state, it is prevented from shifting in that position and is held so as to be wound in an aligned manner. In addition, as the magnetic head 1 rotates 360 degrees, the electric wires 7 intersect and the annular portion interferes with other machine elements, so the electric wires 7 cross each other and interfere with other machine elements, so the electric wires 7 cross each other and interfere with other machine elements at their annular portions. Air is being blown out.

Therefore, the electric wire 7 is wound around the core 4 as shown in FIG. 9 while being blown away by the airflow in a direction that does not interfere with the mechanical elements.

In this way, one winding is completed.

Thereafter, the positioning and guiding process, the insertion process, and the winding process are repeated again in order by the required number of windings.

Incidentally, as such winding progresses, the winding allowance of the electric wire 7 becomes gradually shorter, so that the reciprocating linear motion of the head body 16 and the suction pipe 21 is set to be gradually smaller correspondingly.

Then, in the second and subsequent winding processes, the pair of gripping claws 13 move the pair of holding bodies 190 and the suction pipe 2 at the retreated position of the suction pipe 21 each time in the positioning and guiding process.
1. Grasp the insertion end of the electric vA7 that is held inside the vA7. After this, the pair of rollers 18 rotate in the direction of the dotted line in Figure 1) in the same way as the first time, and pull the insertion end of the electric wire 7 into the inside of the gripping groove 14 so that it is past the hole 8 of the core 4. It should be kept within a small range and aligned with the center line of the hole 8. As already described, the amount of rotation of the pair of rollers 18 and the amount of movement of the suction pipe 21 can be accurately controlled. on the other hand,
Although the length of the winding allowance for the wire 7 may not be as accurate as theoretically due to the winding condition of the wire 7 and fluctuations in the tension at that time, the variation in length inside the suction pipe 21 is usually kept to about ±IH. It will be done. Therefore, the insertion end of the electric wire 7 after being drawn in will protrude outside by a maximum of 1) weight from the surface of the gripping claw 13 facing the core 4 within a range of about ±1)1, or in other words, from that surface by a maximum of 1) weight, or Or, it is only pulled into the gripping groove 14 by a maximum of 1 mm from that surface. The range of variation of this 21) m is as follows: by inserting the insertion end of the electric vA7 with a diameter of 0°03 inches into the 0.8 dragon hole 8,
The accuracy is sufficient for 5 to 25 similar windings.

Incidentally, the pair of gripping claws 13, the feed roller 18, the rotary table 17, the suction pipe 21, the holder 19, the wire holder 20, etc. are connected to a dedicated drive source such as an electromagnetic solenoid or motor, a feed unit, and an endless feed. The linear reciprocating motion of the pair of gripping claws 13 and the suction pipe 21 can be controlled within the necessary stroke range by combining a feed screw mechanism and a stepping motor. Can be set accurately. In addition, the pair of holders 19 and the wire holder 20 can be moved to the rotary table 17 without using a drive source.
It is also possible to operate the cam mechanism in relation to the rotational movement of the suction pipe 21 or the forward and backward movement of the suction pipe 21, and synchronize with each movement. Of course, all movable parts are three-dimensionally arranged so as not to interfere with the electric wires 7 and other mechanical elements.

An example of such a specific driving means is the above-mentioned Japanese Patent Application Laid-open No. 5
It is described in detail in the publications of JP-A No. 9-195814, JP-A-59-195815, and JP-A-59-200409, as well as the above-mentioned US patents.

Modifications of the Invention In the above embodiment, the magnetic head 1 is rotated to wind the electric current m7 around the core 4.
As shown in the figure and FIG. 13, it can also be obtained by rotating the wire presser 20 through 90 degrees along the winding surface. Therefore, the rotational movement of the winding process is
It is sufficient if it is relative between the wire 7 and the electric wire 7.

Further, the pair of rollers 18 can be replaced with a retracting member other than rotational movement, such as a feed pawl.

Effect of the invention The present invention provides the following unique effects.

First, the insertion end of the wire is not cut before it is inserted into the hole, so the initial length of the wire is not longer than necessary, and therefore the amount of movement of the pair of gripping claws and the suction pipe is reduced. Can be made as small as possible.

This is extremely effective in increasing the speed of winding.

Secondly, since the electric wire is gripped inside the gripping groove and pulled into the gripping groove by a pair of rollers, the insertion end of the electric wire is determined by the relative positioning of the gripping groove and the hole in the core. Within the accuracy range, it is directed approximately into the hole tC,S&. Therefore, the present invention does not require sophisticated positioning image processing.

[Brief explanation of drawings]

Fig. 1 is a process diagram of the winding method of the present invention, Fig. 2 is a bottom view of the magnetic head to be wound, Fig. 3 is a side view of the electric head, and Figs. 4 to 6 are the winding method. Each process diagram, Figures 7 to 9 are enlarged plan views of the winding process,
FIGS. 10 and 1) are plan views of a pair of gripping bodies, and FIGS. 12 and 13 are enlarged plan views of the winding process in a modified example. 1... Magnetic head, 4... Core, 7... Electric wire, 8... Hole, 10... Feeding claw, 13... Gripping claw, 15... Cutter, I7... Rotating table, 18... Roller. 19...Holding body, 20...Wire holder, 21...Suction pipe. Fig. 7 Fig. 2 Fig. 3 Fig. 4'yB6 Fig. 72

Claims (2)

[Claims] (1) A positioning and guiding process in which the insertion end of the electric wire is held in the gripping groove of a pair of gripping claws and guided near the hole in the core, and after this positioning and guiding process, vacuum suction is applied from one side of the core using a suction pipe. An insertion process is performed in which an air flow is generated in the insertion direction of the electric wire through the hole in the core, and this air flow is used to insert the insertion end of the electric wire into the hole in the core from the other side of the core, and after this insertion process, the above-mentioned core and electric wire are inserted. and a winding step of winding the electric wire around the core by relatively rotating the wires in the winding direction, the gripping grooves of the pair of gripping claws are positioned on the center line of the hole in the core during the positioning and guiding step. and then pulling the gripped wire into the gripping groove to align the insertion end of the wire substantially with the center line of the hole in the core. (2) The above positioning step according to the number of windings of the electric wire,
The wire winding method according to claim 1, characterized in that the insertion step and the winding step are repeated.