Metal working – Means to assemble or disassemble – Means to assemble electrical device
Patent
1995-01-25
1996-09-24
Vo, Peter
Metal working
Means to assemble or disassemble
Means to assemble electrical device
29744, 81125, 221212, B23P 1904, B23Q 315
Patent
active
055578411
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a parts feeding device of the type utilized in a field where a feed rod is received in a guide tube so that it can be advanced and retracted and parts held in the feed rod are fed to an intended place for insertion into a receiving hole in a mating member.
This type of parts feeding device is disclosed in Japanese Patent Kokai No. 270075/92. It Is of the type in which a feed rod is received in a guide tube so that it can be advanced and retracted and parts held in the feed rod are fed to an intended place for insertion into a receiving hole in a mating member, wherein a parts feeding tube for feeding parts to the feed rod and the guide rod are joined together by a bracket having an air cylinder fixed thereto, said air cylinder being firmly joined to a stationary member. A part fed from the parts feeding tube to the feed rod and held at the front end of the feed rod is positioned immediately below a movable electrode which is a mating member by the air cylinder. Thereafter, the air cylinder is operated to move the part to the movable electrode, whereby the part is inserted in the receiving hole in the movable electrode.
In the arrangement in which the piston rod of the air cylinder is connected to the bracket which is used to join the guide tube and the parts feeding tube together, as described above, the load acting on the piston rod becomes imbalanced, preventing smooth operation of the air cylinder. That is, when the guide tube is heavier than the parts feeding tube, a bending load acts on said vertically disposed piston rod, making it difficult for the piston rod to slide smoothly. Particularly, since a part has to be inserted in the receiving hole in the movable electrode, said bending load impedes the correct relative positioning between the part and the receiving hole, making it impossible to insert the part. Even if the bending load on the piston rod is removed by joining the stationary member and the movable member by a guide groove, an abnormal force acts on the guide groove, thereby making it impossible to attain a smooth guide slide movement.
SUMMARY OF THE INVENTION
The present invention has been provided to solve these problems. Claim 1 is directed to a parts feeding device of the type in which a feed rod is received in a guide tube so that it can be advanced and retracted and parts held in the feed rod are fed to an intended place for insertion into a receiving hole in a mating member. The guide tube is joined to the lower side of a base plate and an air cylinder is fixed to the upper side of the base plate, said air cylinder being supported by a stationary member, such that the stroke of said air cylinder effects insertion of a part into said receiving hole. The combined weight of the guide tube itself and member integral therewith acts on the stationary member through the upper and lower sides and air cylinder.
Claim 2 directed to a parts feeding device as set forth in claim 1, wherein an air cylinder for advancing and retracting the feed rod is joined to one end of the guide tube and a parts feed control unit for feeding parts to a holding member installed at the front end of the feed rod; thus, weight including that of said air cylinder and parts feed control unit acts on the stationary member as in claim 1.
Claim 3 is directed to a parts feeding device as set forth in claim 1, wherein a shim member is interposed between the lower side of the base plate and the guide tube and the clearance thus defined between the lower side of the base plate and the guide tube serves as an air hose passage space; thus, the air hose is disposed in the clearance is free to move in said clearance.
Claim 4 is a parts feeding device as set forth in claim 1, wherein an air passage is formed in the feed rod, said air passage having an air hose connected thereto through a joint, said guide tube being formed with an elongated opening for passing said joint therethrough; thus, when the feed rod is advanced and retracted, said joint passes through the elonga
REFERENCES:
patent: 3550484 (1970-12-01), Pecoraro
patent: 3864804 (1975-02-01), Kawaguchi
patent: 3898833 (1975-08-01), Richardson
patent: 4515005 (1985-05-01), Klein
patent: 5191691 (1993-03-01), Aoyama
patent: 5205456 (1993-04-01), Ohuchi et al.
patent: 5230141 (1993-07-01), Aoyama
patent: 5359171 (1994-10-01), Aoyama
patent: 5390524 (1995-02-01), Higgs
Aoyama Shoji
Aoyama Yoshitaka
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