| 摘要 |
PROBLEM TO BE SOLVED: To make a control box compact and to improve cooling efficiency of a heating part by providing a plate-like frame member vertically extending, and installing an electric part on both surfaces of the member in the control box arranged under a sewing machine table and housing a sewing machine control electric part. SOLUTION: A frame 21 of a control box 20 of a sewing machine is made of metal, and is constituted in a cross-sectional view T shape out of the plate- like main frame part 21B extending in the vertical direction and the upper/lower frame parts 21A, 21C horizontally arranged above and below it. An electric part such as a motor drive circuit containing an inverter circuit for driving a power transformer 40 and a sewing machine motor is installed in the main frame part 21B. The opening parts 21h to 21k are formed in the main frame part 21 to improve weight reduction and gas permeability, the projecting parts 21d and 21e are arranged to receive heat radiation by contacting with a heating part containing the power transformer 40, and drive elements 41a, 44c are contacted with the respective projecting parts 21d, 21e.
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