Abstract: An electronic control arrangement for a sewing machine with a frame having access openings at the top and bottom thereof and supporting therein functional mechanical and electromechanical and electrical sewing machine components. The electronic control arrangement includes a control panel disposed over a portion of the top access opening and interconnected with printed circuit boards having electronic components thereon for regulation of the electromechanical sewing machine components, the entire arrangement being organized to be removable as a whole for replacement or substitution from the top access opening. Means are provided accessible from the bottom access opening to removably support the control arrangement at the bottom thereof and provide a heat sink therefor.

Abstract: A heat sink arrangement for a circuit board in a sewing machine which supports the circuit board for ready disassembly therefrom, and makes use of the sewing machine frame as an additional heat sink. The circuit board is riveted to an aluminum heat sink member which carrys the power transistors in a manner to provide good thermal conductivity thereto but electrically isolated therefrom by mica laminae. An aluminum bracket firmly affixed to the sewing machine frame for good thermal conductivity has a large area planar surface thereof contiguous a similar large area planar surface of the heat sink member. A clamp member which extends through a slot in the bracket has a pair of upstanding arms with reentrant angles which touch the surface of the heat sink member opposite the large planar surface. The surface of the bracket opposite the large planar surface is formed with a cylindrical surface at an angle to coact with a cone pointed screw carried by the clamp member.