| 摘要 |
PROBLEM TO BE SOLVED: To prevent a working cassette 5, where a hollow needle 80 is revealable/retractable, from carelessly coming off the rocking arm 40 of a sewing machine main body. SOLUTION: A horizontal U shape engagement groove 86 formed at the tip part of the outer periphery of the storing case 86 of the working cassette 5 is fitted to an engagement pin 42 which is horizontally projected at the tip part of the rocking arm 40. The tip of a nearly Z shape engagement member 44a arranged in the rocking arm 40 so as to be rotatable is engaged with an engagement part at a rear end side so that a posture is kept. Setting is performed with proper separation so that the rear end of the engagement member 44a comes close to be touchable the tip of an operation member 44b in the posture where the tip side of an arm part 40a is rotated upward in the rocking arm 40 and, then, the rear end part of the engagement member 44a is separated to be untouchable the tip part of the operation member 44b in the posture where the tip side of the arm part 40a is rotated downward in the rocking arm 40 (a sewing work posture with the largely projected hollow needle 80).
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