JPH0212023B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a wire feeding device that automatically feeds ultra-fine gold wire or aluminum wire in a wire bonding device.

Structure of the conventional example and its problems As shown in a specific example in FIG. 1, the conventional wire feeding device has a wire reel 2 around which a wire 1 is wound, which is detachably fixed to a reel base 3, and a wire guide 4. The wire tube 5 was fixed to the wire reel 2 in an easily attachable and detachable manner, and the wire tube 5 was fixed to the wire guide 4 in an easily attachable and detachable manner.
In such a configuration, the force for withdrawing the wire 1 is generated external to the wire feeding device, so that
wire 1, wire tube 5, wire guide 4,
There are many accidents where the wire 1 is cut or damaged due to friction or catching with the wire cover 6, etc. Also, when changing the wire, the wire 1 must be passed through the wire tube 5, which makes the work difficult. I had a bad problem.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and provides a wire feeder with a wire feeding function to ensure stable wire supply and simplify wire replacement work.

Composition of the Invention The present invention fixes a wire reel to a rotatable drum with ease, connects the drum to a motor, connects the drum and a wire drive shaft with a belt, and connects a wire pressing roller to the wire drive shaft. The motors are in contact with each other and are configured to be able to rotate with each other via wires, and two detectors for instructing the motor to start and stop rotation are arranged below. Furthermore, the detector that commands the start of rotation of the motor has a swing-like shape in which two shafts are connected by two thin conductive wires, and when the wires come into contact, the lower shaft deflects due to the springiness of the two wires. The detector is configured so that when the wire slackens beyond a certain level, electrical continuity is created between the wire and the detector to indicate rotation stop. has been done.
In this configuration, in order to maintain a certain range of slack between the wire supply device and the wire bonder, when the slack in the wire becomes small, the wire comes into contact with a detector designated to start rotation, and the motor rotates, keeping the slack constant. If it becomes larger than that, the wire will come into contact with the rotation stop detector and the motor will stop. In such a configuration, the slack of the wire can be maintained within a certain range between the wire supply device and the wire bonder, and the wire will not be cut or bent when it contacts the detector, and the wire This is extremely advantageous in terms of supply stability.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. In FIG. 2, 7 is a drum, 8 is a wire reel, 9 is a motor that rotates the motor, 10 is a wire feeding roller, 11 is a wire press roller 12 is a belt that transmits rotation between the drum and the wire feeding roller, and 13 is a wire A bracket for holding the presser roller, 14 is a wire guide, 15 is a wire guide mounting plate, 16 is a detection mounting shaft, 17 is a detection shaft hanging wire, 18 is a detection shaft, 19 is a stop detection plate, and 20 is from an electrical insulator. 21 is a wire, 22 is a DC power source, 23 is a galvanometer with a contact for issuing a rotation start command, 24 is a galvanometer with a contact for issuing a rotation stop command, and 25 is an electric conductor. . Next, referring to FIG. 3, the structure of an embodiment of the drum and wire feeding roller will be explained.
The drum 1 is rotatably held on the main body base by two bearings 26, and is held on the circumference by a wire reel 8 having a wire 21 wound around the circumference so as to be easily attached and detached. On the other hand, the wire feeding roller 10 is
It is rotatably held by a wire feed-out roller shaft 28 via two bearings 7, and the shaft 28 is fixed to a base 20 made of an insulator by a retaining ring 29, and is electrically insulated from other parts. .

In FIG. 2, the wire presser roller 11 is attached to a bracket 1 fixed to a base 20 made of an insulator.
The rollers 11 and 13 are in contact with the wire 21, and the belt 12 transmits the rotation of the drum. The wire guide 14 is fixed to a wire guide mounting plate 15,
The wire guide mounting plate 15 is fixed to the base 20. The wire rotation command is detected by a wire attachment shaft 16, a detection shaft hanging wire 17, and a detection shaft 18. The detection shaft 18 is soldered to one end of two detection shaft suspension wires 17, and the other end of the two detection shaft suspension wires 17 is soldered to a wire attachment shaft 16 fixed to a base 20 made of an insulator. The two hanging wires 17 are suitably copper wires with a diameter of 0.1 to 0.2 mm, and are arranged so that they first come into contact with the detection shaft 18 when the wires 21 are no longer slack. When the wire 21 comes into contact with the detection shaft 18, the detection shaft hanging wire 17 is bent and the wire 21 is bent, so that detection can be performed without causing damage such as scratches.

At this time, if the lengths of the two hanging wires 17 are equal, the wire 21 always contacts the detection shaft 18 at point A as shown in FIG. If there is dust, dirt, etc. on the detection shaft 18 at point A and there is no electrical continuity, the wire will be bent or bent. However, if two hanging wires with different lengths are used as shown in Fig. 5, if there is dust or dirt on the detection shaft 18 at point B and there is no electrical continuity, the wires will move to the right. slip on,
Electrical continuity can be established at point c, and the wire does not bend or bend. The appropriate inclination θ of the detection shaft 18 in FIG. 5 is 15° to 30°.

On the other hand, in FIG. 2, the stop detection plate 19 is arranged below the detection shaft 18 and fixed to a base 20 made of an insulator.

Next, an example of control used for detection will be described based on FIGS. 2 and 3. DC power supply 2
The + side of 2 is wire feeding roller shaft 28
Connect to. This shaft 28 is the bearing 2
7 and the wire 21 via the wire feed-out roller 10 to have electrical continuity. The negative side of the DC power supply 22 is divided into two parts, one of which is connected to the motor 9.
The other end is connected to the wire attachment shaft 16 through a galvanometer 23 having a contact point for issuing a command to start rotation of the motor 9, and the other end is connected to the wire attachment shaft 16 through a galvanometer 24 having a contact point for issuing a command to stop rotation of the motor 9. It is connected to the detection plate 19. Each detection point is fixed to a base 20 made of an insulator,
electrically isolated from each other. The wire 21 is passed from the wire reel 8, between the wire feed roller 10 and the wire presser roller 11, between the two wire guides 14, and between the wire detection shaft 18 and the stop detection plate 19 to the wire bonding device. Supplied. When the motor 9 is rotated, the drum 7, wire reel 8, and wire feed roller 10 are rotated, and the wire 21 is supplied.
The wire is consumed in the bonding equipment and wire 2
1, the wire 21 comes into contact with the wire detection shaft 18, and at this time, in the control circuit, from the contact point A on the wire feeding roller shaft 28, the wire 21, the wire 21, the detection shaft 18, the hanging wire 17, and the attachment are connected. A current flows through the galvanometer 23 through the contact B on the shaft 16, actuating a contact provided on the galvanometer 23 that issues a motor rotation command, rotates the motor 9, and supplies the wire 21. The wire 21 continues to be supplied, and the wire 21
When the motor contacts the stop detection plate 19, current flows from the contact A through the wire 21, the stop detection plate 19, and the contact C to the galvanometer 24, which activates a contact provided in the galvanometer 24 that issues a motor stop command. to stop the rotation of the motor 9.

Effects of the Invention As described above, the present invention provides the wire feeding device with the following features:
Suspend the wire detection shaft with two hanging wires,
By creating a structure in which the detection shaft escapes when the wire comes into contact with the detection shaft, the wire can be bent.
It is possible to maintain the slack of the wire within a certain range without causing damage such as scratches, and is extremely advantageous in terms of stable wire supply.

[Brief explanation of drawings]

Figure 1 is a sectional view of a conventional wire feeding device, Figure 2 is a sectional view of a conventional wire feeding device;
The figure is a perspective view of a wire feeding device according to an embodiment of the present invention, FIG. 3 is a sectional view taken along the line X-X in FIG. 2, FIG. 4 is a front view of a conventional detection shaft, and FIG.
The figure is a front view of a detection shaft in an embodiment of the present invention. 7...Drum, 9...Motor, 12...Wire reel, 16...Wire mounting shaft, 17...
Detection shaft hanging wire, 18...Detection shaft, 19...Stop detection plate, 21...Wire.

Claims (1)

[Claims] 1. A drum that holds a wire reel wound with a wire and is rotatably supported, a motor that drives the drum, a wire detection means for detecting the wire, and a signal from the wire detection means. and a control circuit for controlling the motor, and the wire detecting means has a first shaft arranged horizontally, and a lower part suspended from the first shaft at an angle via two wires of different lengths. A wire feeding device that detects contact with the wire at the second shaft of the wire by electrical continuity. 2. The wire feeding device according to claim 1, wherein the second shaft has an inclination of 15° to 30°.