Obara Corporation

Shigeru Umeda

Tsuyoshi Takatori

Toshihiro Nishiwaki

An X type electric welding machine with an electrode pressing force that is not susceptible to the wear of electrodes or variation of deflection of gun arms which varies every pressing force. An accurate electrode pressing force can be obtained for an electrode pressing force set by a simple controller. The X type electric welding machine includes at least two gun arms each having electrodes at tip ends thereof which oppose each other. The gun arms are connected to each other at a connection part on which at least one gun arm is rotatably pivoted. A reduction gear is disposed separately from the connection part of the gun arms and a motor is connected to the reduction gear. A power transmission mechanism is provided at an output side of the reduction gear for rotating one of the gun arms, wherein the power transmission mechanism includes a swing arm fixed to an output shaft of the reduction gear and a link formed between the swing arm and one of the gun arms. The swing arm and the link are connected to each other so that an output from a shaft of the motor and an electrode pressing force applied by one of the electrodes that is transmitted to the one of the electrodes from a tip end of the swing arm by way of the link, have a substantially linear proportional relation.

X type electric welding machine

A stopper device in a welding robot gun is capable of increasing the amount of movement of the upper arm and reducing the amount of movement of the lower arm or vice versa by adjusting the protruding amount of the stopper bolt from the rear wall of the stopper cylinder inside the stopper cylinder and of preventing the upper and lower arms from moving unstably from the state where the welding gun is open to the state where a pressure cylinder supplies fluid under pressure. The stopper device comprises a cradle, a stopper cylinder having a rod fixed to the cradle, a tip end of the rod connected to a rear end of the upper arm by way of a link wherein the stopper cylinder has a front chamber provided with a fluid supply and discharge port and a rear wall into which an adjustable stopper bolt is screwed so as to protrude deep or slight therefrom inside the stopper cylinder.

Stopper device in a welding robot gun

A chip holder fixing device comprising an arm having a circular hole defined therein into which a rear portion of a chi8p holder is inserted. The chip holder is fastened to the arm by way of a bolt. The arrangement assures the positioning of the chip holder relative to the arm and the prevention of the chip holder from turning.

Chip holder fixing device

The welding robot gun connecting device comprises a cradle having a hollow frame, a connecting plate fixed to a rear plate thereof and a U-shaped connecting member fixed to a tip end of a robot wrist wherein the connecting plate is inserted into and fixed to the U-shaped connecting member by bolts from outside portion of the U-shaped connecting member in order to miniaturize the device and make the fixing operation easier utilizing the hollow frame of the cradle.

Welding robot gun connecting device

A C-type welding robot gun holding apparatus having a pressure cylinder which is short in the longitudinal direction thereof and a welding robot gun which is low in height. The C-type welding robot gun holding apparatus comprises an L-shaped bracket fixed to a tip end of a robot wrist and having a projection, a fixing cylinder disposed over the pressure cylinder having a rod which is disposed in confronting relation with a front surface of the projection at a tip end of the rod and a stopper provided at a stopper holding member protruding from the rear end of the pressure cylinder being directed toward a rear surface of the projection.

C-type welding gun robot holding apparatus

A water cooling piping system for welding robot gun comprising first to third cooling water supply pipes and first to fourth cooling discharge pipes for cooling an electrical transformer and other elements and capable of improving the efficiency of the welding operation reducing the bulkiness and weight of the conventional piping system by way of eliminating the manifold and simplifying the piping.

Cooling water piping system for welding robot gun

A welding transformer in a welding gun for robot capable of lightening the weight thereof as a whole and of reducing the assembling and disassembling process of the constituents thereof. The welding transformer is disposed within a cradle composed of a hollow frame and has a core fixed to the cradle by fastening members so as to be integrated with the cradle.

Welding transformer in a welding gun for robot

The present invention provides a welding gun for robot provided with a cradle formed of a hollow frame. The cradle has side plates serving also as stopper receivers for receiving stoppers of the welding gun arms, thereby eliminating an extra member for receiving the stoppers and laborious working for attachment of such extra member. A space to be occupied by the extra member is omitted and can be effectively utilized for holding a welding transformer.

Welding gun for robot

A connection member in a welding gun for a robot having a cradle of the welding gun generates less stress by directly connecting the cradle with a robot wrist, whereby the welding gun is positioned as close as possible to the robot wrist. The welding gun for robot can be shortened by accommodating a welding transformer inside a hollow frame defined in the cradle.

Connection member in a welding gun for robot

A welding gun comprises a base having a stopper at the tip end thereof and a vertical axis at the inside thereof, an arm having an electrode at the upper end thereof and a lower end slidably engaged with the vertical axis, cylinder integrated with the arm 1 and having a cylinder rod, a movable arm having an electrode at the tip end thereof and pivotally connected to the tip end of the cylinder rod at the rear end thereof by a pin, a link for pivotally connecting the arm with the movable arm at the middle portions thereof by pins, the link having an engaging portion at the lower end thereof extending toward the stopper and a spring provided in a space between the lower end of the vertical axis and the lower end of the arm. The arm, as opposing the movable arm, can be equalized with ease.

Welding gun having equalizing function

A welding gun comprises a fixed arm having an electrode at an end thereof and integrated with a cylinder at the other end thereof and a pin at the middle portion of the fixed arm for swingably mounting the fixed arm on a base, the cylinder having a piston provided with a rod at the distal end thereof; a movable arm having an electrode at an end thereof opposite to the electrode of the fixed arm, a pin at the other end thereof for connecting the movable arm to the rod of the piston, and a pin at the middle portion of the movable arm; and a link connecting the pins respectively provided at the middle portions of the fixed arm and the mocable arm for pivotally connecting the fixed arm to the movable arm.

Growing community of inventors

Tokyo, Japan

Shigeru Umeda