Metal fusion bonding – Including means to move or guide applicator
Reexamination Certificate
2000-03-22
2001-05-01
Ryan, Patrick (Department: 1725)
Metal fusion bonding
Including means to move or guide applicator
C228S012000
Reexamination Certificate
active
06223971
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a driving unit of a welding equipment capable of converting a rotary output of a motor into reciprocating motion of a pressure application shaft so that the pressure application shaft can operate a gun arm or a welding jig.
2. Related Art
There is a conventional driving unit of a welding equipment, as disclosed, for example, in Japanese Patent Laid-Open Publication No. 11-197843. This driving unit of a welding equipment includes a pressure application shaft that is driven by a motor and has a portion to be pulled in the motor, a shaft of a rotor (rotary shaft) of the motor formed of a hollow shaft, a screw shaft fixed inside the rotary shaft at one end thereof, and a nut fixed to the end of the pressure application shaft and screwed with a screw provided in the screw shaft so that the pressure application shaft and the nut are movable on the inner peripheral surface of the rotary shaft.
However, in the conventional driving unit of a welding equipment, since the diameter of the nut fixed to the end of the pressure application shaft is larger than that of the pressure application shaft, the diameter of the rotary shaft or hollow shaft is larger than the diameter of the nut, so that the diameter of the motor becomes larger, and a difference in level is formed between the outer periphery of the pressure application shaft and that of the nut. As a result, bearings of the pressure application shaft can not slide on the portion close to the difference in level therebetween so that a part of the pressure application shaft is not utilized as a direct moving guide part, resulting in increasing the length of the pressure application shaft.
SUMMARY OF THE INVENTION
The invention has been made in view of the problems of the conventional driving unit of a welding equipment, and it is a first object of the invention to provide a driving unit of a welding equipment capable of reducing the inner diameter of a rotary shaft of a motor as much as possible so as to employ a small-sized motor, and also capable of reducing the entire length of the driving unit of the welding equipment.
It is a second object of the invention to provide a driving unit of a welding equipment capable of not only reducing the length of the pressure application shaft but also rendering the driving unit of the welding equipment to be reduced in length and small-sized in size by disposing a bearing of a direct moving guide part of the pressure application shaft on the front wall part of the motor so that the direct moving guide part of the pressure application shaft can slide on the inner surface of the bearing.
It is a third object of the invention to provide a driving unit of a welding equipment capable of easily fixing a screw shaft to a rotary shaft by use of fixed means utilizing a friction force without requiring a troublesome operation such as shrinkage fit or cold shrinkage fit.
It is a fourth object of the invention to provide a driving unit of a welding equipment capable of moving a pressure application shaft to a desired standby position when a motor is troubled by forming a machining part for manually turning the screw shaft at the rear end side of the screw shaft.
REFERENCES:
patent: 5549015 (1996-08-01), Aiso et al.
patent: 5966988 (1999-10-01), Aiso et al.
patent: 644 014 (1995-03-01), None
patent: 7-290251 (1995-11-01), None
patent: 9-144834 (1997-06-01), None
patent: 3042268 (1997-07-01), None
patent: 11-197843 (1999-07-01), None
Flynn ,Thiel, Boutell & Tanis, P.C.
Johnson Jonathan
Obara Corporation
Ryan Patrick
LandOfFree
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