JPH09199364A - Chuck mechanism of automatic winder and its work holding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a core from undergoing a large force even when a central axis of a chuck does not coincides with that of a core by a method wherein a work is lightly interposed and held at the instant that the work is received by the chuck. SOLUTION: When a work 60 is received and interposed by a chuck 20, after it is interposed temporarily by a weak force, it is interposed by a strong force. That is, its top end comprises the chuck 20 having an opening part 21 and a tapered face 22, a cylinder 50 which comes into contact with the tapered face 22 to close finely the opening part 21 when it is biased by a spring 32 to a top end part side of the chuck 20 and is moved to the top end part side of the chuck 20, and a pressing mechanism capable of pressing the cylinder 50 to a contraction direction of the spring 32, so that it is possible to switch at two strong and weak steps a pressing force applied to the cylinder 50 by the pressing mechanism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic winding machine used in a winding process of electronic parts such as coils and delay lines, and more particularly to a chuck mechanism for holding a work (part to be wound) and this chuck. The present invention relates to a method for holding a work by a mechanism.

[0002]

2. Description of the Related Art In the case of a high frequency coil in which a wire is wound around a magnetic core, in order to wind the core with an automatic winding machine, one end of the magnetic core is held by a chuck and the chuck is held. It's done by spinning. The chuck must hold the core securely to prevent the core from coming off when the chuck is rotating.

[0003]

When the core is mounted on the chuck, the central axes of the chuck and the core may not coincide with each other due to a dimensional error of the chuck and a variation in the dimensions of the core. In such a case, a biased strong force was applied to the core when the chuck was closed, and the core was sometimes broken. A magnetic core made of ferrite or the like is liable to be chipped or cracked, and in the past, about several percent of such core breakage defects occurred when the chuck was mounted. Therefore, the present invention aims to provide a chuck mechanism having a structure in which the core is not damaged and a method of holding the work.

[0004]

According to the present invention, when a chuck receives a workpiece such as an electronic component and clamps it, the chuck temporarily clamps it with a weak force and then clamps it with a strong force. That is, in the automatic winding machine of the present invention, in the chuck mechanism of the automatic winding machine having the chuck for sandwiching and holding the work in the opening portion of the tip that is divided into a plurality of pieces, the opening has an opening portion at the tip and is separated from the tip portion. A chuck having a taper surface that becomes thinner in accordance with the above, and it is covered by the chuck, is movable along the longitudinal direction of the chuck, and is biased by a spring in the direction of the tip of the chuck. A configuration is provided in which a cylindrical body that abuts and closes the opening narrowly and a pressing mechanism that can press the cylindrical body in the direction in which the spring contracts can switch the pressing force applied to the cylindrical body by the pressing mechanism in two levels of strength and weakness. Characterize. Further, the present invention provides a method for holding a work using such a chuck mechanism of an automatic winding machine, in which the work is inserted into the opening of the chuck after the work is inserted into the opening of the chuck while the pressing force of the pressing mechanism applied to the cylinder is strong. By making the pressure weak, the chuck which is slightly closed holds the work lightly, and by removing this pressing force, the chuck strongly holds the work.

[0005]

1 and 2 show an embodiment of a chuck mechanism in an automatic winding machine according to the present invention. FIG. 1 is a partially cutaway side view, and FIG. 2 is a front view. The support portion 30 of the chuck 20 and the driving portion 40 are fixed to the upper surface of the base 10. Cylindrical chuck 20 with a split tip has an opening at the tip.
21 and is attached to the support portion 30 via a ball bearing. The chuck 20 has its rear part driven to rotate by a driving part 40, so that the chuck 20 can rotate about a horizontal axis. The chuck 20 is provided with a tapered surface 22 near the tip and a flange 24 at the rear, which is tapered toward the tip.

The outer side of the chuck 20 is covered with a tubular body 50 which is movable along the longitudinal direction of the chuck 20. The cylindrical body 50 is formed with a brim-shaped engaging portion 52 and a brim 54. The cylinder 50 is a tsuba
A spring 32 mounted between 54 and the collar 24 of the chuck 20 urges it to the right in FIG. The cylindrical body 50 pushed by the spring 32 and advanced toward the tip of the chuck 20.
Has its tip abutted against the tapered surface 22 of the chuck 20,
It acts to close the opening 21 at the tip of the chuck 20 that is broken into three parts. When the tubular body 50 retracts, the opening 21 is elastically reopened, and has a size capable of receiving the work 60 such as the core of the high frequency coil. Then, the work 60 is sandwiched and held by the opening 21 at the tip of the chuck 20 that opens and closes.

Two air cylinders are provided on the bottom surface of the base 10.
70 and 80 are fixed, and at the end of the base 10, a rotating shaft 92
A lever 90 is attached which is rotatable around. Lever 90
The upper end is bifurcated, and the bifurcated portion abuts the engaging portion 52 so as to sandwich the tubular body 50, and the other end abuts the tip ends of the pistons 72, 82 of the air cylinders 70, 80. There is. The air cylinders 70 and 80 are provided with air supply ports 74 and 84 for supplying compressed air to the inside and exhaust ports 76 and 86 (FIG. 2) for discharging the compressed air from the cylinders, respectively.

FIG. 1 shows a state in which the opening 21 of the chuck 20 is opened. At this time, the two air cylinders 70, 80
Compressed air of the same pressure is fed from the respective air supply ports 74, 84 of the. Pistons 72 and 82 move forward and lever 90
Since the lever is rotated, the lever 90 that has rotated pushes the cylinder 50 backward at the upper end. As a result, the cylindrical body 50 pushes the spring 32, retracts it, and retracts, and the opening 21 of the chuck 20 opens. Two pistons 7
The force to push the lever 90 of 2, 82 is about the same, but
On the principle of leverage, the force of the piston 72 farther from the fulcrum (axis 92) of the lever 90 acts on the tip of the lever 90 more strongly than the force of the piston 82.

Next, the operation of this chuck mechanism will be described. First, in the state shown in FIG. 1, that is, in the state in which the cylinder body 50 is strongly pressed by the lever 90 to open the opening portion 21 to the maximum extent, the supply rod 65 holding the workpiece 60 at the tip is advanced toward the opening portion 21, One end of the work 60 is inserted into the opening 21. Next, the air supply to the air cylinder 70 farther from the fulcrum of the lever 90 is stopped and exhausted. Then, the force pushing the lower part of the lever 90 is greatly reduced by the force of only the other air cylinder 80 near the fulcrum. Accordingly, the force of pushing the tubular body 50 also weakens, and the upper end of the lever 90 is pushed back by the force of the spring 32 as shown in FIG. 3, and the tubular body 50 slightly moves toward the tip of the chuck 20. As a result, the opening 21 is partially closed and the workpiece
The end of 60 is lightly sandwiched.

When the supply rod 65 is retracted from the chuck 20 from this state, the work 60 is separated from the supply rod 65 and is lightly held by the opening 21 of the chuck 20. And
When the air supply of the other air cylinder 80 is also stopped and exhausted, both pistons 72 and 82 are separated from the lever 90 and the lever 90 becomes free as shown in FIG. At this time, the cylindrical body 50 released from the pressing force of the lever 90 is
The force of (FIG. 1) again moves to the right in FIG. 4 to strongly close the opening 21 of the chuck 20. As a result, the work 60 is firmly held on the tip of the chuck 20, and the work 60 is ready for the winding process.

In the above embodiment, two air cylinders are used, and the operation is stopped one by one with a time lag, so that the pressing force applied by the lever 90 to the tubular body 50 can be switched between strong and weak two steps. The same function can be obtained even if only one air cylinder is used and the pressure of the compressed air is changed in two steps of strength and weakness.

[0012]

According to the present invention, at the moment when the chuck receives the work, the work is lightly sandwiched and held. Therefore, even if the central axes of the chuck and the core do not coincide with each other, a large force may be applied to the core. Absent. Therefore, it is possible to very effectively prevent damage to the work such as the core of the high frequency coil. An experiment was conducted with a core made of a ferrite material having a diameter of the winding portion of 1.5 mm and a height of 3 mm.
It was confirmed that the failure of the core that had come out was no longer occurring.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of a chuck mechanism of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a partially cutaway side view of the chuck mechanism when a workpiece is inserted.

FIG. 4 is a partially cutaway side view of the chuck mechanism when the chuck is closed.

[Explanation of symbols]

 20 Chuck 21 Opening 22 Tapered surface 50 Cylindrical body

Claims (5)

[Claims] 1. A chuck mechanism of an automatic winding machine, comprising a chuck for holding a work by sandwiching it in an opening at the tip of a plurality of cracks, and having a tapered surface having an opening at the tip and becoming thinner as the distance from the tip is increased. A chuck that has, and that is covered by the chuck and is movable along the longitudinal direction of the chuck,
A cylindrical body that is biased by a spring in the direction of the tip of the chuck and abuts the tapered surface to close the opening when moving toward the tip of the chuck, and a press that can press the cylinder in the direction in which the spring contracts. The chuck mechanism of the automatic winding machine is characterized in that the pressing mechanism is capable of switching the pressing force applied to the cylindrical body in two steps, strength and weakness. 2. The pressing mechanism is composed of a rotatable lever and a drive member capable of pressing one end side of the lever, and the other end of the lever is brought into contact with an engaging portion formed on the cylindrical body. Chuck mechanism of automatic winding machine. 3. The automatic system according to claim 2, wherein the drive member is composed of two air cylinders, the levers can be pressed by the pistons of the respective air cylinders, and there is a time difference between the timings at which the operation of the two air cylinders is stopped. Winding machine chuck mechanism. 4. A chuck mechanism for an automatic winding machine according to claim 2, wherein the driving member is composed of one air cylinder that operates with compressed air of two levels of strength and strength, and the lever of the air cylinder can be pressed by the piston of the air cylinder. 5. The chuck, which is slightly closed, holds the work by inserting the work into the opening of the chuck with a strong pressing force of the pressing mechanism applied to the cylindrical body and then making the pressing force weak. A method for holding a work by a chuck mechanism of an automatic winding machine, characterized in that the work is held lightly and then the chuck strongly holds the work by removing the pressing force.