Method for producing repulsion magnetic circuit and its production system
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsRyoi Hamaguchi, Hiroshi Wada
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Abstract
The present invention provides a method of manufacture capable of manufacturing a repulsion magnetic circuit for a speaker with good production efficiency and in a stabilized manner and an apparatus for use in the manufacture. A position of abutment between first magnetic block circuit attached to lower jig (102) and second magnetic circuit block attached to upper jig (105) is detected by detection of a load current of servomotor (103). A pressing time for achieving adhesion is established by the number of pulses from encoder directly coupled with servomotor (103).
Claims6
A method of manufacturing a repulsion magnetic circuit, which has at least a first magnetic circuit block constituted of a yoke, a first magnet adhesive bonded to the yoke, and a plate adhesive bonded on to a top face of the first magnet and a second magnetic circuit block constituted of a second magnet adhesive bonded on to a top face of the plate such that its side and a side of the first magnet having identical polarity therewith confront each other,
- the method comprising the steps of:
- attaching the first magnetic circuit block constituted of the first magnet magnetized in advance to a lower jig;
- attaching the second magnetic circuit block constituted of the second magnet magnetized in advance to an upper jig;
- applying an adhesive to at least one of faces to be bonded together of the first magnetic circuit block attached to the lower jig and the second magnetic circuit block attached to the upper jig;
- detecting coming into abutment of the first magnetic circuit block with the second magnetic circuit block when at least one of the first magnetic circuit block attached to the lower jig and the second magnetic circuit block attached to the upper jig is shifted toward the other;
- and
- applying a predetermined pressing force.
An apparatus for manufacturing a repulsion magnetic circuit comprising:
- a lower jig for attaching a first magnetic circuit block thereto;
- an upper jig spaced apart from the lower jig and movable up-and-down for attaching a second magnetic circuit block thereto;
- a screw portion provided on the upper jig in mesh with a ball screw such that rotating movements of the ball screw are converted into up-and-down movements of the upper jig;
- an electric motor for rotating the ball screw in left-and-right directions;
- and
- a controller for giving the electric motor instructions to descend the upper jig for detecting an abutment between the first magnetic circuit block and the second magnetic circuit block, then to keep pressing for attaining adhesive bonding therebetween, and, after a predetermined time of pressing, to reverse rotation of the electric motor for ascending the upper jig to return to its original position.
Dependencies are inferred from the claim text.