Abstract: A printed circuit board is supported at its peripheral portion and is moved and positioned by a drive mechanism. During the drilling of a hole in the circuit board, the thrust of the drill acting upon the circuit board is born by a sliding contact surface on a stand disposed on the side of the board opposite the drill. Ultrasonic vibration is applied to the printed circuit board via the stand during the drilling operation to prevent the occurrence of expoxy smearing.

Abstract: An apparatus for holding a plurality of needle bars of an embroidery machine which includes a support upon which the needle bars are reciprocably mounted; a moving block connected to each of the needle bars for advancement and retraction thereof and including a stopper extending therefrom at a right angle to a direction of movement of the moving block; a driving band connected to the moving block and which includes a locating plate; and a plurality of L-shaped operating levers corresponding to the needle bars, each of the levers including an inclined surface positioned at a front portion thereof and supported on the support so as to be freely rotatable and which includes a mechanism for fixing the needles in an idle position. A plurality of solenoids are also provided which have operation bars attached thereto and which are respectively rotated by the solenoids.

Abstract: An embroidery lace machine is driven by electric signals. A plurality of selection plates control a jacquard and can move horizontally in response to control elements. A reset bar returns the selection plates to their original positions. In one embodiment, the control elements consist of plates aligned with the selection plates and biased into contact with the selection plates. Electrically actuated solenoids selectively prevent movement of selected ones of the control elements. In a second embodiment, the control elements are wires selectively engageable with a sliding plate. Electrically actuated solenoids are provided for selectively connecting the control elements with the sliding plate.

Abstract: A method and apparatus for feeding yarn during a single stitch of a needle such that the mean rotational frequency of a yarn feeding drum connected to a first and second driving member is changed during the single stitch of the needle so as to regulate and control the feeding of the yarn and provide a maximum and minimum yarn length in the resulting stitch or selectively provide a yarn length between the maximum or minimum length.