US 8,031,038 B2Granted

Magnetic fixing device

AssigneePascal Engineering Corporation

InventorSeiji Kimura

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Abstract

The magnetic fixing device comprises a clamping plate having a fixing surface to which a clamping object is fixed and plural magnetic force generation mechanisms. The magnetic force generation mechanisms each comprise a magnetic material member facing the fixing surface, plural permanent magnets arranged around the outer periphery of the magnetic material member, a first Alnico magnet placed on the back of the magnetic material member, and a first coil for switching the polarity of the first Alnico magnet, and can be switched between the absorption state in which the clamping object is adsorbed and the non-absorption state in which the clamping object is not adsorbed. An operation state indication mechanism capable of presenting an indicator indicating that the plural magnetic force generation mechanisms are in the absorption state or in the non-absorption state is provided on the fixing surface or outer periphery of the clamping plate.

Claims14

Dependent claims

A magnetic fixing device comprising a clamping plate having a fixing surface for fixing a clamping object such as a mold and plural magnetic force generation mechanisms installed in the clamping plate for fixing the clamping object to the fixing surface by magnetic force,

wherein each of said magnetic force generation mechanisms comprises a magnetic material member facing said fixing surface, plural permanent magnets arranged around an outer periphery of said magnetic material member, a first Alnico magnet provided on a back of said magnetic material member, and a first coil for switching a polarity of said first Alnico magnet, and can be switched between an absorption state in which the clamping object is adsorbed and a non-absorption state in which the clamping object is not adsorbed,
an operation state indication mechanism capable of presenting an indicator indicating that said plural magnetic force generation mechanisms are in the adsorption state or in the non-adsorption state is provided on the fixing surface or outer periphery of said clamping plate and comprises a second Alnico magnet, a second coil electrically connected to said first coil in parallel wound around said second Alnico magnet, and a movable indication member made from a permanent magnet, and
an energizing circuit that energizes said second coil only while said first coils of said plural magnetic force generation mechanisms are energized is provided.

A magnetic fixing device comprising:

a clamping plate having a fixing surface for fixing a clamping object such as a mold;
plural magnetic force generation mechanisms installed in the clamping plate for fixing the clamping object to the fixing surface by magnetic force;
an operation state indication mechanism;
and
an energizing circuit;
wherein each of said magnetic force generation mechanisms comprises:
a magnetic material member facing said fixing surface;
plural permanent magnets arranged around an outer periphery of said magnetic material member;
a first Alnico magnet provided on a back of said magnetic material member;
and
a first coil for switching a polarity of said first Alnico magnet;
wherein each of the magnetic force generation mechanisms can be switched between an absorption state in which the clamping object is adsorbed and a non-absorption state in which the clamping object is not adsorbed;
wherein said operation state indication mechanism is capable of presenting an indicator indicating that said plural magnetic force generation mechanisms are in the adsorption state or in the non-adsorption state, and is provided on the fixing surface or outer periphery of said clamping plate;
wherein said operation state indication mechanism comprises:
a casing member installed in said clamping plate;
a transparent cover member closing a front of the casing member;
a first housing pit formed in said casing member;
a second Alnico magnet housed in the first housing pit;
a second coil wound around the second Alnico magnet;
and
a movable indication member consisting of a permanent magnet housed in a second housing pit formed in said casing member on a front side of the first housing pit;
and
wherein the energizing circuit energizes the second coil only while the plural first coils of said plural magnetic force generation mechanisms are energized.

20 more elements

Dependencies are inferred from the claim text.