摘要:
The pressing machine includes a pressing ram, a drive arrangement for moving the ram from a starting position to an end-of-stroke position and back to the starting position and includes an electric drive motor. A control arrangement establishes the end-of-stroke position for the ram. The control arrangement includes a direction-reversing circuit connected to the drive arrangement for reversing the direction in which the drive arrangement moves the ram and includes a direction-reversing relay arrangement having a current path for activating current. A controllable electronic switch is connected to the activating current path for controlling the activation of the direction-reversing relay arrangement. A control-signal-generating circuit controls the conductivity of the electronic switch by generating and applying to the control input of the electronic switch a control signal dependent at least upon the loading of the drive motor.
摘要:
A welding device for welding together at least two superimposed foils of thermoplastic synthetic material includes an electrically heated temperature-controlled sealing roller and a counterpressure organ cooperating with roller to form a heated zone in which the foils are tightly welded while pressure is applied thereto. The sealing roller comprises a circular disk-like PTC (positive temperature coefficient) resistor which serves as the heating element and the temperature control, with the PTC resistor having a resistance characteristic which rises steeply in the range of the operating temperature of the sealing roller. The PTC resistor serving as the heating element comprises the effective part of the sealing roller which acts directly on the foils to be welded and has axially opposite electrically conductive end faces each provide with a disk-like metallic contact surface rotatable with the resistor and in electrical contact with the axial end faces. The welding device includes means for supplying electric heating current to the disk-like resistor through the axial end faces thereof via the contact surfaces.
摘要:
Variable-speed electric motor drive includes a universal motor having a power supply line wherein a thyristor is connected and operated in a phase gating circuit, a firing circuit for the thyristor, a variable first resistance connected to the firing circuit of the thyristor for varying the rotary speed of the motor, and a temperature-dependent second resistance associated with the firing circuit and thermally coupled to the thyristor.
摘要:
Household garbage compactor, including a press or stamper for executing a piston stroke for given short periods of time in a container disposed in a frame holding garbage to be compacted, a pressure plate for compacting the garbage, and a device for easily releasably holding and re-attaching the pressure plate to the press means.