JP2535911Y2 - Tip dresser - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a tip dresser for shaping a tip of an electrode tip into a predetermined shape by cutting the tip with a rotating blade.

[0002]

2. Description of the Related Art In recent years, automation of work by a robot or the like has been promoted at a production site for the purpose of reducing the manufacturing cost and the work load of an operator. There is no exception at a welding site where a welding operation is performed. For example, a work robot 30 as shown in FIG. 4 is performing a welding operation in place of an operator. Work robot 30 shown in FIG.
Has an arm 31 movable in a three-dimensional direction, and an openable and closable hand unit 32 provided at the tip of the arm 31.
, A pair of electrode tips 33 serving as electrodes are held facing each other. In order to weld an object such as an outer plate of an automobile body, the hand part 32 is opened to separate the electrode tip 33 up and down, and the arm 31 is moved to join the electrode tip 33 between the two electrode tips 33. Position the part. Thereafter, the hand portion 32 is closed, the joint of the object is sandwiched between the two electrode tips 33, 33, and a large current flows between the electrode tips 33, 33 to weld the joint.

By the way, if such welding work is performed continuously, the tips of the electrode tips 33, 33 are worn or deformed, and the welding strength of the article to be joined is reduced. Therefore, it is necessary to periodically cut the tip of the electrode tips 33, 33 with a tip dresser 1 'to shape it into a predetermined shape. Then, in order to enable long-time unmanned work by the work robot 30 as described above, a tip dresser 1 'is installed within the work range of the work robot 30 as shown in FIG. Movement of the arm 31
The electrode tips 33, 33 held by the hand unit 32 are moved to the tip dresser 1 'so that cutting and shaping can be performed.

[0004]

However, there are cases where various obstacles exist in the area where the arm 31 of the working robot 30 can move, and the tip dresser 1 'cannot be installed in a suitable place. . For example, in an installation place as shown in FIG. 5, even if the tip dresser 1 'is to be installed at the most suitable place, the surrounding obstacles 22 to 2 may be located.
5 prevents the tip dresser 1 'from being installed. Therefore, in such a case, the operator must periodically replace the electrode tips 33, 33 or cut the electrode tips 33, 33 with a tip dresser 1 'provided at another location. There is a problem that long-time continuous unattended work cannot be performed. The present invention has been made to solve the above-mentioned problems, and can be installed by simply making a change even in a place where an obstacle exists, and a work robot or the like automatically installs an electrode chip. An object of the present invention is to provide a tip dresser that enables continuous unattended operation for a long time by enabling cutting.

[0005]

In order to solve the above-mentioned problems, a tip dresser of the present invention transmits the rotation of a rotating shaft driven by a driving source to a driven gear equipped with a cutting tool via a worm and a worm wheel. In the tip dresser configured to rotate the cutting tool together with the driven gear to cut the electrode tip, a drive source, and a worm and a worm wheel that are rotated via the rotation shaft by driving the drive source are provided. A tip dresser main body, a gear attached to a holder mounting portion formed on the tip dresser main body, which is detachable at a predetermined mounting angle with respect to the tip dresser main body, and which is rotated by rotation of the worm wheel, A holder that houses a driven gear that is rotated by the rotation of the gear; Mounting means for mounting to the tip dresser body at a mounting angle, wherein an output shaft rotated by rotation of the worm wheel is projected from a holder mounting portion of the tip dresser body, and the output shaft and the holder mounted on the holder are provided. The gear is engaged with the gear.

[0006]

The present invention is configured as described above and operates as follows. When the worm and the worm wheel housed in the tip dresser body are rotated by the driving of the drive source, the rotation of the worm wheel is transmitted to the gears in the holder via the output shaft. Due to the rotation of the gear, the driven gear is rotated via an intermediate gear and the like, and a cutting tool provided concentrically with the driven gear is rotated on the driven gear to cut the electrode tip. Since the gear and the output shaft are detachable, when the holder is removed from the holder mounting portion of the tip dresser body, the engagement between the gear and the output shaft is released. The holder is attached to the tip dresser main body by attaching means such as bolts in a state where the holder is turned at a predetermined angle, for example, any direction of 90 degrees. When the holder is mounted on the holder mounting portion, the gear and the output shaft are engaged with each other, so that the rotation of the worm wheel can be transmitted to the gear.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of the chip dresser of the present invention, in which main parts are cut away, and FIG. 2 is a side view of the chip dresser of FIG. 1 taken along the line II. The tip dresser 1 includes a tip dresser main body 2 in which a motor as a driving source is housed, and a holder 3 formed separately from the tip dresser main body 2. A blade 4 provided concentrically with the driven gear 17 on the driven gear 17 is rotatably and detachably attached to the tip end of the holder 3. The cutting tool 4 worn or the like by cutting the electrode tips 33, 33 (see FIG. 4) is replaced with a new one together with the driven gear 17.

A pinion 6a is provided at a tip end of a rotary shaft 6 of the motor, and the pinion 6a meshes with a gear 7 of a shaft 10 rotatably supported in the tip dresser body 2 by bearings 9,9. doing. Tip dresser body 2
A worm 11 formed in the middle of the shaft 10
And a worm wheel 8 that meshes with the worm 11. The worm wheel 8 is mounted on the shaft 10
And is rotatable with the output shaft 12. The output shaft 12 is supported by bearings 5a and 5b fitted in holes 18 of the tip dresser main body 2, and one end of the output shaft 12 has a holder mounting surface 2a formed by cutting out a part of the tip dresser main body 2. Projecting vertically upwards. This output shaft 10
Are inserted through the bearings 5a, 5b and the worm wheel 8 from the upper side of the holder mounting surface 2a to insert the tip dresser body 2
The snap ring 12b is externally fitted on the other end side to prevent slipping. A part of the bearing 5a fitted in the hole 18 protrudes from the holder mounting surface 2a, and can be fitted in the fitting hole 3a of the holder 3 having the same inner diameter as the outer diameter of the bearing 5a. I have. When the holder 3 is attached to the tip dresser main body 2, the fitting hole 3a and the bearing 5a are fitted, and the positioning of the holder 3 is performed.

The holder 3 has a gear 15 rotated by the rotation of the output shaft 12, an intermediate gear 16 meshed with the gear 15 and rotatably supported in the holder 3, and a driven gear meshed with the intermediate gear 16. A gear 17 is provided.
A key 14 is fitted between the gear 15 and the output shaft 12, the gear 15 can rotate integrally with the output shaft 12, and a snap ring 12 a is fitted on the tip of the output shaft 12 so that the gear 15 is It does not come off. Therefore, by removing the snap ring 12 a from the output shaft 12, the gear 15 can be attached to and detached from the output shaft 12. With the above configuration, when the driving source is driven and the output shaft 12 rotates, the rotation is transmitted to the driven gear 17 via the gear 15 and the intermediate gear 16, and the blade 4 rotates in the same direction as the rotation direction of the output shaft 12. Let it.

The holder 3 is provided with the tip dresser body 2.
Bolts 1 serving as mounting means on the holder mounting surface 2a
It is detachably attached by 3, 13, .... The bolt holes of the holder 3 through which the bolts 13 are inserted are arranged at equal intervals on a circumference centered on the rotation center of the gear 15, and the holder 3 is set at 90 degrees to the tip dresser main body 2. Holder mounting surface 2 even if the direction is changed left and right
It can be made to match with the screw hole formed in a. The bolts 13 are desirably provided outside the cutting edge circle of the gear 15 in order to improve workability when attaching and detaching the holder 3 to and from the tip dresser body 2. In the drawing, reference numeral 19 denotes a cover for the holder 3, which is attached to the holder 3 by a plurality of bolts 20, 20,.

The operation of the tip dresser 1 of the present invention having the above-described structure will be described. FIG. 3 is a schematic diagram illustrating the operation of the present invention. Obstacles 22 to 2 as shown in Fig. 3 (b) and Fig. 3 (c).
In order to dispose the tip dresser 1 at a place where the tip dresser 5 is located, the holder 3 is moved from the state shown in FIG.
In order to change the direction by 90 degrees, the following procedure is used. Loosen the bolt 20 of the cover 19 and remove the cover 19 from the holder 3. The snap ring 12a of the gear 15 is removed from the output shaft 12, and the gear 15 is removed from the output shaft 12. Loosen and remove bolts 13, 13
Is removed from the holder mounting surface 2a of the tip dresser body 2. With the holder 3 turned 90 degrees with respect to the tip dresser body 2, the fitting hole 3 a of the holder 3 is inserted into the bearing 5.
a, and the holder 3 is slightly rotated about the bearing 5a to align the bolt holes of the bolts 13, 13... with the screw holes of the tip dresser body 2. The bolts 13 are screwed and tightened to fix the holder 3 to the tip dresser body 2. The gear 15 is attached to the output shaft 12 with the key grooves aligned, and the snap ring 12 a is fitted to the output shaft 12. The cover 19 is closed, and the bolt 20 is tightened to fix the holder 3.

In this embodiment, if the gap between the stepped portion 2b provided on the tip dresser main body 2 and the holder 3 is made sufficiently wide, the holder 3 and the tip dresser main body 2 may interfere with each other. Instead of removing the gear 15 from the output shaft 12, the holder 3 can be rotated around the bearing 5a simply by removing the bolts 13, 13,... So that the direction can be easily changed. Become.
Further, the electrode tips 33, 33 (FIG.
When cutting is performed, a strong eccentric force acts on the holder 3 due to the cutting tool 4 rotating at a high speed and the electrode tips 33, 33 pressed against the cutting tool 4 at a high pressure, so that the holder 3 can be used for a long time. The positional relationship with the tip dresser main body 2 may be shifted. Also in this case, the bolts 13, 13
By using a reamer bolt, or by inserting a positioning member between the stepped portion 2b of the tip dresser main body 2 and the holder 3, displacement can be prevented.

Although the preferred embodiment of the present invention has been described, the present invention is not limited to this. For example,
In the above embodiment, the holder 3 has been described as being attachable to the tip dresser body 2 in a state where the direction of the tip dresser body 2 is turned 90 degrees left or right with respect to the tip dresser body 2. Needless to say, as long as it can be securely positioned and fixed, it can be attached to the tip dresser main body 2 in a state where an arbitrary angle direction is changed.

[0014]

[Effects of the Invention] Since the present invention is configured as described above, the following effects can be obtained. Since the holder for mounting the cutting tool and the tip dresser main body containing the drive source and the like are configured separately, and the holder is detachably configured in a state where the holder is turned at a predetermined angle with respect to the tip dresser main body, Even if there is an obstacle or the like in the place where the tip dresser is installed, the tip dresser can be easily installed. For this reason, the tip dresser can be installed in a place where it was conventionally difficult to install the tip dresser, and a long-term unmanned continuous operation by a working robot or the like becomes possible.

[Brief description of the drawings]

FIG. 1 is a sectional side view of the tip dresser of the present invention.

FIG. 2 is a side view of the chip dresser of the present invention, taken along the line II of FIG. 1;

FIGS. 3A and 3B are schematic views illustrating the operation of the tip dresser of the present invention, in which FIG. 3A shows the tip dresser in a normal state, and FIGS.
It is a figure showing the state where it turned to right and left.

FIG. 4 is an explanatory diagram showing a work robot at a welding site and a positional relationship between the work robot and a tip dresser.

FIG. 5 is a schematic diagram illustrating a problem in a conventional work site.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tip dresser 2 Tip dresser main body 2a Holder mounting surface (holder mounting portion) 2b Stepped portion 3 Holder 4 Cutting tool 5a, 5b, 9 Bearing 6 Rotating shaft 7 Gear 8 Worm 10 Shaft 11 Worm wheel 12 Output shaft 13 Bolt (Mounting means) ) 15 gears 16 intermediate gears 17 driven gears

Claims (1)

(57) [Scope of request for utility model registration] 1. A tip configured to transmit rotation of a rotating shaft by driving of a driving source to a driven gear equipped with a cutting tool via a worm and a worm wheel, and rotate the cutting tool together with the driven gear to cut an electrode tip. In the dresser, a tip dresser body containing a drive source, a worm and a worm wheel that are rotated via the rotation shaft by driving the drive source, and a holder mounting part formed on the tip dresser body, A holder which is detachable in a state where the direction of the predetermined angle is changed with respect to the tip dresser main body, and which holds a gear rotated by the rotation of the worm wheel and a driven gear rotated by the rotation of the gear, Mounting means for mounting the holder to the tip dresser body at the predetermined mounting angle; An output shaft rotated by rotation of the worm wheel is projected from a holder mounting portion of the tip dresser body, and the output shaft and the gear provided in the holder are engaged. Tip dresser.