Abstract: A silencer of the resonance absorption type in a motor-compressor for refrigerators in which the resonance chamber is formed by a blind cylindrical bore in the cylinder block and communicates with the refrigerant gas duct through an opening in the valve plate.

Abstract: A needle plate on the base of a sewing machine with a pin projecting from the plate lower surface. The pin is coil spring biassed upwardly to allow rotation of the plate about the pin and selection of one of two holes in the plate to cooperate with the needle. Flexure of a leaf spring, that engages the pin, will draw the needle plate into a fixed position on the base.

Abstract: A muffler for hermetically sealed compressors consisting of a body made of plastic material with two chambers separated by a wall and directly assembled on the compressor cylinder head by means of two lined up small tubes equipped with special sealing means. The danger that the muffler may break loose from the head and possibly rotate on its axis of vertical symmetry is thus avoided.

Abstract: A sewing machine (100) having a needle bar (120,122) and feed means (131,132,602,603) in which actuators (124,130) adjust the transverse position of the needle bar (120,122) and the positional displacement of the feed means (131,132,602,603) in response to control signals provided thereto, and a rotatable main shaft (104,204,205) operatively connected to the needle bar (120,122) for enabling transverse oscillation thereof which shaft (104) is driven by a main motor (201), includes an arrangement for generating synchronizing timing control signals to the actuators (124,130) and a stop control signal to the motor (201) to stop the shaft (104,204,205) in a predetermined arc of rotation in which a common magnet (208,508) mounted in a holder (207,507) for rotation with the shaft (104,204,205) interacts with a pair of spaced apart magnistors (211,213) to provide the timing control signals to the actuators (124,130) and a separate magnet means which may be either a single magnet (509) or a pair of spaced apart magne

Abstract: An improved household type sewing machine having a needle bar and a feed dog wherein an actuator adjusts the transverse position of the needle bar and the positional displacement of the feed dog in response to control signals provided thereto, in which a microcomputer integrated circuit is provided for controlling the machine in response to keyboard selectable pattern and control information stored in a static memory which is interchangeable with other memory configurations to provide different patterns, such as alphabetic stitch patterns. The keyboard contains a numeric display with each of the patterns having a corresponding numeric equivalent which is displayed on the keyboard to indicate which pattern is selected.

Abstract: The present invention is an improved electronic type sewing machine in which a microcomputer integrated circuit arrangement, such as a master/slave microprocessor configuration, is employed to effectuate stitch position coordinate servo control for both bight and feed through digitally closing the position servo control loop. The sewing machine includes actuator means for adjusting the transverse position of the needle bar means and the positional displacement of the feed means in response to control signals provided thereto and static memory means, such as a read-only-memory, for retrievably storing a plurality of different predetermined stitch patterns each having associated retrievably stored bight and feed data corresponding to predetermined positional coordinates of the needle bar and feed means for defining associated stitch position coordinates for the stitches comprising the stitch patterns.

Abstract: In a sewing machine with connectable and disconnectable needle bars driven by a motor for two needle stitching in different directions, a keyboard programmer and control device connected to the programmer to select the needle bar to be disconnected and the number of stitches to be sewn at low speed with only one needle, to shut down the sewing machine, to count the stitches number at the beginning of the sewing in the second direction to connect the needle for restarting the two-needle sewing and to switch the sewing machine back onto high speed. The device comprises two decade meters the first of which, at the end of the first stitches sewing counting, controls the machine shutdown and sends an advancing pulse to the second decade meter and, at the end of the second stitches counting, sends another pulse to the second decade meter which is switched to send a signal for the reconnecting of the needle bar and the de-energizing of the relay of the low speed.

Abstract: A device for automatic tension release in an upper thread tension adjusting assembly which includes a drive shaft, actuating the detachment of the tension disks of said adjusting device, characterized in that said drive member is built in the thread tension adjusting device and is made by an electromagnet placed in a circular crown arranged between the tension disks and the adjusting knob.

Abstract: An automatic sewing unit formed by a loading station, a mounting table, a transfer mechanism, two preparing stations, two sewing stations and a stacking station for sewn pieces in which the transfer mechanism is made from a mounting member sliding on a guide driven by a pneumatic motor and whereon are positioned a first group of kinematic members and their relative pneumatic actuators to obtain the lifting and lowering movements of a series of pressers provided for the intermittent conveyance of the fabric pieces to be sewn and a second group of kinematic members and their relative pneumatic actuators to vertically draw displacement of the fabric piece from a stack placed in the loading station. Progressive movement of the fabric pieces toward the following stations are made by the displacement of the mounting member along the guide.

Abstract: A sewing threads trimming device for sewing machines provided with a blade adapted to make, at the end of a sewing operation and in a suitable timing relation with the hook and needle movements, a first displacement over the hook during which a thread loop closes over the blade and thereafter a second movement in the opposite direction to bring the sewing threads into contact with a counterblade and cut them, including a cam of magnetizable material deriving its motion from the sewing machine main shaft and having a portion of little thickness and an arc-shaped front contour and a second portion diametrically opposed to the first having a particular contour to impart prescribed motion to the threads trimming blade and a cam follower comprised of a U-shaped member closed by a cylindrical portion adapted to couple with the cam and connected to a blade carrying shaft through a plate and crank mechanism.

Abstract: An improved household type sewing machine having a needle bar and a feed dog wherein an actuator adjusts the transverse position of the needle bar and the positional displacement of the feed dog in response to control signals provided thereto, in which a microcomputer integrated circuit is provided for controlling the machine in response to keyboard selectable pattern and control information stored in a static memory which is interchangeable with other memory configurations to provide different patterns, such as alphabetic stitch patterns. The keyboard contains a numeric display with each of the patterns having a corresponding numeric equivalent which is displayed on the keyboard to indicate which pattern is selected.