JPS6311115B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding device suitable for manufacturing a mesh structure of an image pickup tube.

The mesh structure for the image pickup tube consists of three objects to be welded. That is, an annular support 11 formed into a cylindrical shape around a hole bored in the center, a mesh body 12 formed into a disk shape, and an annular disk 13 bored in the center are sequentially loaded. , the mesh structure is formed by welding at multiple points at equal intervals around the circumference.

In order to assemble the mesh structure into the image pickup tube, it is necessary to ensure that the three objects to be welded are not eccentric, and to prevent distortion of the video screen, uniform welding must be performed at equal intervals to avoid sagging or wrinkles on the disk-shaped mesh body. This is required.

Conventionally, welding was performed by manually determining the angle of a jig on which the object to be welded was placed, making it impossible to obtain equal welding intervals or uniform welding.

The present invention relates to a welding device that eliminates the above-mentioned drawbacks and enables automatic welding, and will be described below based on embodiments with reference to the drawings.

As shown in FIGS. 1 and 2, the welding apparatus of the present invention includes a jig 1 for aligning and mounting objects to be welded and fixing one of the objects to be welded, and a welding interval by rotating the jig intermittently. A drive mechanism 2 for setting, a lift mechanism 3 for moving the jig 1 up and down to press the welding object against the welding electrode, and an electrode support mechanism for slidably supporting the welding electrode and generating the pressure contact force necessary for welding. Consists of 4.

That is, the jig 1 has three objects to be welded (an annular support 11, a disc-shaped mesh body 12, and an annular disc 1).
3) and a locking piece for locking the spring 15 and a claw 16 that is pressed against the side wall of the hole by a spring 15 at the bottom of a stepped hole 14a drilled in the center in order to align and place the parts on the jig body 14. 16a, and the cylindrical part of the annular support 11 placed in the hole 14a is attached to the hole side wall of the jig by the locking piece 16 with the claw 16.
a to secure it in place.

In the jig 1, a jig attachment/detachment knob 17 is fixed to a flat surface 14b provided by cutting a part of the outer cylindrical surface. A through hole is bored horizontally in the knob 17, and a compression spring 18 and a stopper 20 are slidably housed in the through hole. A ring-shaped notch is provided at the tip of the stopper 20, and a pin 19 is arranged in this notch so as to be freely engageable. That is, by pinching the pin 19 with fingers, the stopper 20 is moved out of the knob 17 and fixedly inserted into a jig insertion body 29 of the drive mechanism 2, which will be described later.

Next, the mechanism of the welding apparatus of the present invention will be explained with reference to FIGS. 3 to 5.

The drive mechanism 2 includes a motor 21a integrated with a reducer 21b fixed on a base 60 via a support 21, a bevel gear 22 attached to its output shaft 21c, and another bevel gear meshing with the bevel gear. Two bevel gears 23
a first shaft 24 to which the bevel gear 23 is fixed and rotatably supported; and a Geneva 25 fixed to the shaft 24.
, a Geneva gear 26 that meshes with the roller 25a of the Geneva gear 25, a second shaft 27 to which the Geneva gear 26 is fixed and rotatably supported, and a slide fixed above the second shaft 27 by a screw 28a. It consists of a key 28 and a jig insertion body 29 that fits into the key 28 and the second shaft 27 and is slidably attached. 60a is a support plate for bearings 24a and 27a, 60b is a bearing 24
b, 27b support plate. The rotation of the motor 21a is transmitted to the first shaft 24 via a pair of bevel gears 22 and 23, and is transmitted to the second shaft 27 through the meshing of the Geneva gear 26 through the Geneva gear 25 as intermittent rotation.

A cam 30 having a groove (not shown) carved at the start position is fixed below the second shaft 27, and a micro switch 31, for example, is fixed in contact with the cam 30.

When the start switch 46 is pressed, the motor 21a is started by an electric circuit (not shown), and when the second shaft 27 rotates once and welding is completed, the roller 31a enters the groove of the cam 30 to cut off the motor power and weld. Stop the device.

As shown in FIG. 4b, the jig insertion body 29 has a recess 29a carved in the center thereof into which the jig 1 shown in FIG. attaching and detaching. A jig guide 32 having a hole 32a into which the stopper 20 of the jig 1 is inserted is fixed to one of the openings of the recess 29a.
Insert the jig 1 on which parts 2 and 13 are placed.

Around the substrate 53, there is a container frame 54 between the base 51 and the base 51.
is assembled and fixed.

The lift mechanism 3 includes a cylindrical cam 33 fixed to the upper end of the first shaft 24, one end of which is in contact with a cam surface 33a of the cylindrical cam 33, and the other end of which is a groove carved below the jig insertion body 29. 29b and is pivotally connected to the bracket 51a via the support 53. While the second shaft 27 is stopped, the swinging lever 35 pressed down by the cylindrical cam 33 causes the lever 35 to
The jig insertion body 29 is pushed up according to a cam roller 35b rotatably disposed at the tip of the welding member 29, and the object to be welded is brought into pressure contact with the welding electrode 36. The manual lever 35a is
The roller 35 swings about a pin 53c pivoted to a support 53b attached to the bracket 52a, and the tip thereof is rotatably disposed on the swing lever 35.
The spring 3 is placed in contact with the
5d.

This manual lever 35a is used when the workpiece to be welded is warped and floats. That is, the manual lever 35a
When you press the lever 35a, the other end of the lever 35a moves to the roller 35c.
is pushed up to bring the workpiece to be welded into contact with a welding electrode 36, which will be described later, to perform temporary welding and stabilize, after which automatic welding can be performed. 53 is a bracket 52a,
52b and is arranged around the lower part of the jig insertion body 29. A lid body 56 is fixed on the substrate 53 to protect the jig insertion body 29 and to contribute to the extraction of a ground for electric welding, which will be described later.

The electrode support mechanism 4 supports objects to be welded 11, 12, 13.
The welding electrode 36 is supported almost perpendicularly to the welding electrode 36, the arm 37 supporting the welding electrode 36, and the arm 37 is fixed to a column 38 which is supported so as to be movable up and down. 39, a compression spring 41 that presses down the column 38, and a lower column support 4 that is fixed to the column 38.
The stopper ring 43 keeps the column 38 in the depressed position by contacting the workpiece 11,
12 and 13 are pushed up by the lift mechanism and come into contact with the welding electrode 36, and by pushing up the welding electrode further, the spring 41 is compressed to generate the pressure contact force necessary for welding. One or more pillars 38 are prepared, but in this embodiment, a case will be described in which one pillar is used. When the support column 38 is pushed up to the welding position, the switch 44 is fixed at a position where it comes into contact with the upper surface of the detent 40, and when the switch is operated, a welding current is supplied from a welding power supply controller (not shown), and the arm The terminal 45 fixed to the terminal 37 passes through the arm 37 and the welding electrode 36 to reach the object to be welded, and welding is performed. Note that the conductive jig 1 serves as a ground-side electrode.

Next, the operation of the apparatus of this embodiment having the above configuration will be explained.

When the jig 1 on which the objects to be welded 11, 12, and 13 are placed is inserted into the jig insertion body 29 and the start switch 46 attached to the top of the welding device is pressed, the motor 21a is started by an electric circuit (not shown). , the first shaft 24 is rotated, the swing lever 35 is pushed down by the cylindrical cam 33, the jig insertion body 29 is pushed up, the object to be welded and the welding electrode 36 are brought into pressure contact, and the detent 40 is turned off. 44 is activated, welding current is supplied, and the first welding is performed.

When the first welding is completed, the swing lever 35 is lifted by the cylindrical cam 33, the jig insertion body 29 is lowered, the workpiece and welding electrode are separated, the Geneva 25 meshes with the Geneva gear 26, and the second shaft 27 is rotated by a set angle, the Geneva gear 25 and Geneva gear 26 are disengaged and stopped.

Next, the first shaft 24 enters the second rotation and pushes up the jig insertion body 29 to perform the second welding.

This welding operation is repeated continuously for the number of heads of the Geneva gear, and when the second shaft 27 rotates once, the desired welding is completed and the switch 31
When the motor 21a is inserted into the groove, the power to the motor 21a is cut off and the motor 21a is stopped.

In the embodiment, the electrode support mechanism 4 is described in which the electrode 36 is installed at one location, but the electrodes 36 are installed at three locations as shown in FIG. a welding electrode was installed). Three points are welded at the same time in one welding process, and the objects to be welded 11, 12, 1
3 as a whole and the mesh body is shifted, it is possible to prevent wrinkles and at the same time reduce the number of welding operations and improve work efficiency.

Depending on the type of image pickup tube, especially the size of the mesh structure, the welding device may use an 8-head Geneva gear to perform spot welding at, for example, 8 to 24 points equally spaced on the circumference of the object to be welded, or a 12-head Geneva gear. However, it is also possible to perform spot welding at, for example, 12 to 36 locations at equal intervals on the circumference of the workpiece.

As described above, according to this embodiment, the welding interval is determined by the Geneva and the Geneva gear, so that the division accuracy is good, the reproducibility is excellent, and the welding interval is uniform.

Note that the ground for the welding current may be taken from the body of the welding device, but as in this example,
As shown in FIG.
An annular terminal 47 is fixed to the annular terminal 47, and a hollow disc-shaped lead 49, which is pressed down by a spring 48 and has a hole smaller than the outer diameter of the annular terminal, is attached at a distance above the annular terminal 47, and each mechanism of the welding device is attached. Electrolytic corrosion of members can be prevented.

That is, when the jig insertion body 29 is pushed up, the annular terminal 47 and the hollow disc-shaped lead 49 come into pressure contact, and when welding current is supplied, the welding electrode 36 and the workpiece 1
3, 12, 11, a method in which electricity is conducted to the outside from the terminal 50 connected to the hollow disc-shaped lead 49 via the jig 1, the jig insertion body 29, the annular terminal 47, and the hollow disc-shaped lead 49. be.

As is clear from the above description, in the welding apparatus of the present invention, a plurality of objects to be welded, for example, three objects, are properly aligned by using a jig, so there is no eccentricity, and the spacing between spot welds is determined by Geneva and Geneva gears. Therefore, the division accuracy is high, and uniform welding intervals can be obtained with excellent reproducibility.

Intermittent rotation by the Geneva gear has the advantage that slippage between the workpiece and the jig can be prevented because the speed is gradually reduced at the beginning and end of the rotation.

Since the pressure force between the workpiece and the welding electrode can be adjusted for each electrode, homogeneous spot welding can be performed without wrinkles or sagging on the mesh body. This method has the following effects and also enables automatic welding. By making two jigs, you can inspect the mesh structure welded with one jig while welding with another jig, and then align and place the workpiece on the jig in preparation for the next weld. This welding equipment has great benefits in industrial use, such as the ability to use work time more effectively.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a jig related to a welding apparatus according to an embodiment of the present invention, FIG. 2 a is a side view showing a part of FIG. 1 cut away, and FIG. 3 is a plan view showing an embodiment of the welding apparatus of the present invention; FIG. 4a is a side view showing a part of FIG. 3 cut away; FIG. 4 b is a perspective view showing a part of Fig. 4a, and Fig. 5 is a line A in Fig. 3.
It is a sectional view showing -A in the direction of the arrow. 1 ... Jig, 2 ... Drive mechanism, 3 ... Lift mechanism, 4 ... Electrode support mechanism, 11, 12, 13
...Object to be welded, 16...Claw, 21a...Motor,
25... Geneva, 26... Geneva Gear, 29...
Jig insertion body, 33... Cylindrical cam, 35... Rocking lever, 36... Welding electrode, 36, 38... Support column,
40...Stop rotation, 41...Spring.

Claims (1)

[Claims] 1. A conductive jig that fixes the workpiece to be welded, a drive mechanism that supports the jig and rotates it intermittently at equal angles to set the welding interval of the workpiece within the same plane, and a drive mechanism that supports the jig and rotates the jig intermittently at equal angles to set the welding interval of the workpiece within the same plane. a lift mechanism that presses the object to be welded against the welding electrode; and a lift mechanism that pushes up the jig to bring the welding electrode into contact with the object to be welded, and further pushes it up to apply the pressure contact force necessary for welding. A welding device comprising: an electrode support mechanism for generating electricity; and an electrode for applying electricity to a welded part.