| 摘要 |
PROBLEM TO BE SOLVED: To make adjustable the lowering driving force, elevating driving force, etc., of a cartridge holder even when the slide quantity of a slide plate is made small. SOLUTION: Four tilt guide grooves 76 in total of a slide plate 57 which drives four guide pins 75 in total of a cartridge holder 56 upward and downward are constituted to two stages of angles in a slanting direction; and, for example, an upper-end side 76A has a large angle and a lower-end side 76b has a small angle.
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