Disk driving device for a disk cartridge

A disk driving device for causing information to be written into and read out of a disk cartridge when the disk cartridge is loaded in a body of the device, comprising:

• a cartridge holder having a cartridge guide member made of resin and having a plurality of openings formed therein and a frame wherein first and second guide rollers are provided at each of opposite sides of said guide member for admitting the guide member into said frame with said guide member being fixed within the plane of said frame;
• a base member of said body;
• a plurality of guide pins positioned on said base member and which respectively are received in said openings of said guide member;
• a slide plate mounted on said base and having means for biasing said slide plate in a direction opposite an intended direction of insertion of the disk cartridge, said slide plate having guide slots formed in said slide plate at opposite sides thereof and in which the rollers are engaged in one-to-one correspondence for supporting said frame and guide members, each of said guide slots having a first portion positioned a predetermined distance from said base member and from side portions of said cartridge holder, a second portion positioned upstream of said first portion with respect to a direction of insertion of the disk cartridge and positioned between said first portion and said base member, and a slanted member connecting said first and second portions to each other whereby respective movement of said guide member and said slide plate permits proper registration of said guide member and said slide plate for operation upon insertion of said disk cartridge;
• and
• a latch provided on the base member such that, upon movement of said slide base in the direction of insertion of the disk cartridge, the slide plate is latched to prevent the slide plate from return movement opposite said direction of insertion and, when the disk cartridge is inserted into the cartridge holder, the slide plate is unlatched.