Lock setting changing unit

In a locking system constituted by a housing, a slider provided in said housing and having a plurality of opened grooves into which magnetic lock pins are inserted, and a pair of plates provided in said housing so that a magnetic card key can be inserted between said plates, said system being further constituted by;

• a lock setting changing unit for changing lock setting of said locking system comprising:
• a rotatable disc;
• a sliding member provided in a closed-end hole crossing a middle of said rotatable disc while being urged outward by a spring;
• and
• a cut-off shoulder formed in said sliding member on one side thereof which is perpendicular to a direction along which a groove is opened in said sliding member,
• wherein a setting tool is inserted into a center hole of said disc so that an engagement groove of said setting tool is engaged with said groove of said sliding member, said disc is rotated by said setting tool so that magnetic lock setting can be changed into a new magnetic lock setting position, and then a top end head portion of said sliding member is urged by a spring so as to be inserted into one of corresponding engagement grooves in a circuit recess portion, so that said setting tool is allowed to be relieved from said groove of said sliding member.