Abstract: A digital signal processing apparatus including: an arithmetic circuit that performs first digital signal processing on an input signal SA sampled at a first sampling frequency f1 and second digital signal processing on a result of the first digital signal processing; a timing control circuit that controls and causes the arithmetic circuit to perform the first and second digital signal processing; and a control circuit that monitors in real-time at least one of an amount of data subjected to the second digital signal processing and an amount of data to be transmitted by the input signal SA, and which controls the timing control circuit when the monitored data amount reaches a predetermined value.

Abstract: A digital signal processing apparatus including: an arithmetic circuit that performs first digital signal processing on an input signal SA sampled at a first sampling frequency f1 and second digital signal processing on a result of the first digital signal processing; a timing control circuit that controls and causes the arithmetic circuit to perform the first and second digital signal processing; and a control circuit that monitors in real-time at least one of an amount of data subjected to the second digital signal processing and an amount of data to be transmitted by the input signal SA, and which controls the timing control circuit when the monitored data amount reaches a predetermined value.

Abstract: A pipe joint is made up of a hollow cylindrical joint body made of an elastic material with a prescribed length, a circular flange embedded into each of the ends of the joint body, through holes provided axially at prescribed intervals in the direction of the circumference of the flanges and the joint body, and both flanges connected to the joint body with a connecting appliance penetrating into these through holes.

Abstract: This pipe joint comprises a hollow cylindrical joint body made of elastic material such as heat-resistant rubber with a prescribed length, and a circular flange for connecting piping attached to the both sides of the joint body, on the side of the inner circumference of the joint body is provided a bellows metal pipe closely contacted with the joint body, and the thickness of the joint body is at least larger than the size of the summit or the trough of bellows of the metal pipe.

Abstract: This pipe joint comprises a hollow cylindrical joint body made of elastic material such as heat-resistant rubber with a prescribed length, and a circular flange for connecting piping attached to the both sides of the joint body, on the side of the inner circumference of the joint body is provided a bellows metal pipe closely contacted with the joint body, and the thickness of the joint body is at least larger than the size of the summit or the trough of bellows of the metal pipe.

Abstract: This pipe joint comprises a hollow cylindrical joint body made of elastic material with a prescribed length, a circular flange is embedded into each of the both ends of the joint body, a plurality of through holes are provided communicating axially at prescribed intervals in the direction of the circumference of said flanges and the joint body, and said both flanges are connected to the joint body with a connecting appliance penetrated into these through holes.

Abstract: A vibration isolation spring mount is disclosed. A compression coil spring is inserted between an inner sleeve and an outer sleeve and a pair of pads are disposed on the inner sleeve and the outer sleeve. Outwardly extending blades disposed on the open end of the inner sleeve are inserted into the spaces defined by inwardly extending teeth disposed on the open end of the outer sleeve, then the blades are rotated relative to the teeth until the teeth and the blades impingingly engage due to the compressed compression coil spring biasing the teeth against the blades.

Abstract: A vibration isolation spring mount is disclosed. A compression coil spring is inserted between an inner sleeve and an outer sleeve and a pair of pads are disposed on the inner sleeve and the outer sleeve. Outwardly extending blades disposed on the open end of the inner sleeve are inserted into the spaces defined by inwardly extending teeth disposed on the open end of the outer sleeve, then the blades are rotated relative to the teeth until the teeth and the blades impingingly engage due to the compressed compression coil spring biasing the teeth against the blades.

Abstract: A slide-type potentiometer for speed control of electric motors under control of a foot-pedal actuator mechanism comprising an actuating rod reciprocatably movable in the longitudinal directions thereof, a spring member for urging the actuating rod in one of the longitudinal directions, a contact supporting member having an electrical contact secured thereto and mounted on the actuating rod so as to be movable in the longitudinal directions along with the actuating rod, a resistor element positioned such that the electrical contact member is slidably moved on the resistor element upon movement of the actuating rod, and a housing for enclosing the contact supporting member and the resistor element, the housing has a through-hole through which one end portion of the actuating rod extends outwardly.

Abstract: There is provided a DC motor speed control system comprising a main motor circuit which supplies a motor current from an AC source through a full-wave rectifying circuit and a semiconductor element having a control electrode to a DC motor, a manually variable voltage setting means which is connected with the full-wave rectifying circuit, a charging circuit which is connected with the manually variable voltage setting means, a switching element having a control element which is connected with the charging circuit and, when the charged voltage in the charging circuit reaches a predetermined value, is made conductive to discharge the charging circuit thereby to supply a discharge current to the semiconductor element as a triggen current, a constant voltage element which is connected with the full-wave rectifying circuit, and a detecting means which detects the counter electromotive force induced in the motor.

Abstract: A speed control circuit arrangement for controlling a rotational speed of an AC commutator motor by an AC controlled rectifier element. The speed control circuit arrangement comprises a pulse transformer which is connected at the secondary winding to the control electrode of the AC controlled rectifier element and one of two main electrodes of the controlled rectifier element and supplies a trigger pulse to the control electrode, a variable resistor for adjusting the rotational speed of the motor, a first capacitor connected at one end through the variable resistor to the other main electrode and at the other end to one end of an AC power source, a pulse generating element connected across said first capacitor with the primary winding of the pulse transformer intervening therebetween, and a first resistor connected at one end to the one main electrode and at the other end to the other end of the AC power source through the first capacitor.

Abstract: A motor speed control apparatus for an electrically-driven sewing machine capable of effecting single stitch comprises a main motor circuit for supplying a motor current to a motor from an AC power supply through a main switch and a semiconductor element with a controlled electrode, a first control means for controlling the semiconductor element in order to effect normal operation, a controller adapted to change between its first and second state so as to control the speed of the motor continuously when the first control means is energized, a second control means for controlling the semiconductor element for effecting single stitch, and a change-over means for changing over the operation between the first and second control means. The second control means includes means for setting the trigger voltage for conducting the semiconductor element, a switching element coupled with the trigger-voltage setting means, a bias means for energizing the switching element, and a charge-discharge circuit.

Abstract: A motor control apparatus for driving a power sewing machine comprises a main motor circuit for supplying a motor current to a DC motor from an AC power supply through a main switch and a semiconductor element with a control electrode, a controller for controlling the speed of the motor, a first control means for effecting normal stitching by controlling the conduction state of the semiconductor element, a second control means for effecting a single stitch by controlling the conduction state of the semiconductor element, and a means for switching the operation between the first and second control means. The second control means includes a needle position detector means for detecting the needle to reach predetermined positions, a switching means connected in series to the needle position detector means, a trigger voltage supply means for applying a trigger voltage to the control electrode of the semiconductor element, and a switch-operating means.