摘要:
In order to provide a forklift capable of performing an inching control suitable for a specific work and a running operation of the forklift and an inching control method of the forklift, an inching ratio calculating unit calculates an inching ratio, a target engine speed calculating unit calculates a target engine speed, a modulation control unit sets a time constant of the inching ratio in response to a speed difference between the target engine speed and an actual engine speed and outputs a correction inching ratio having the time constant set thereto, a multiplication unit outputs a correction absorption torque obtained by multiplying the correction inching ratio by a target absorption torque, and a HST pump electromagnetic proportional control output current converting unit outputs a current instruction value to a pump capacity setting unit.
摘要:
In an engine-overrun-preventing control device, if an engine speed exceeds a maximum speed, a minimum value of an inching rate is set such that higher the actual engine speed results in a higher minimum value of an inching rate. The hydraulic pump displacement is adjusted to obtain a higher inching rate between the minimum value of the inching rate and an inching rate set based on a brake stroke. If the engine speed exceeds a commanded speed and a pressure time-rate-of-change at the pump intake exceeds a prescribed value, the minimum value of the inching rate is set such that the higher the pressure time-rate-of-change, the higher the minimum value of the inching rate. The pump displacement is adjusted to obtain a higher inching rate between the minimum value of the inching rate set based on the pressure time-rate-of-change and the inching rate set based on the brake stroke.
摘要:
An electrostatic encoder comprising receiving coupling electrodes formed on a scale, and extending in a predetermined direction, transmitting coupling electrodes provided on a sensor head, and located to face the receiving coupling electrodes, digital electrodes provided on the scale to extend from the receiving coupling electrodes in a direction perpendicular to the predetermined direction, and arranged at a predetermined pitch, two pairs of interdigital electrodes provided on the sensor head, and located to face the digital electrodes, a voltage applying portion configured to apply an alternating voltage to the transmitting coupling electrodes, and a potential difference detecting portion configured to detect a potential difference between the interdigital electrodes of each of the two pairs of interdigital electrodes. The two pairs of interdigital electrodes are arranged at the same pitch, and the each pair of interdigital electrodes are spaced apart from each other by a predetermined distance in the predetermined direction.
摘要:
A potential difference is applied between a movable electrode disposed a facing surface of a movable member, which the facing surface confronts a substrate extended in a predetermined direction or a vibrating member supported on the substrate vibratably in the predetermined direction, and a counter electrode disposed on the substrate or the vibrating member so as to confront the movable electrode. The applied potential difference causes an electrostatic force to act such that an apparent friction between the vibrating member and the movable member is greater than an apparent friction between the substrate and the movable member when displacing the vibrating member in a desired direction relatively on the substrate by vibrating in the predetermined direction, and thereby the movable member is relatively moved in the desired direction on the substrate.
摘要:
A current detector detects a driving current Im flowing through a light emitting device (laser diode); a temperature sensor is arranged in the vicinity of the light emitting device; a microcomputer is supplied with the outputs of the current detector and temperature sensor; a temperature correction coefficient specific to the light emitting device, obtained based on a driving current value IT1 at a temperature T1 and a driving current value IT2 at a temperature T2 (>T1), is stored in memory; a deterioration threshold current Id for a detected temperature Ti is calculated; and when the deterioration threshold current Id for the detected temperature Ti is exceeded by the detected current, a driver is controlled so as to inhibit the supply of the driving current to the light emitting device. Since the operating temperature also is taken into consideration, deterioration of the light emitting device can be accurately estimated, thereby preventing erroneous recording/reproduction of data.
摘要:
A main memory stores a signal reproduced from a recording medium with a time base error, and a read clock generator and phase modulator generates a read clock signal of variable phase for reading out the signal from the main memory. A velocity compensating circuit generates first discrete signals representative of the velocity error of the reproduced signal at designated sample points of a current field and second discrete signals representative of a velocity error of the reproduced signal at sample points of a previous field respectively corresponding to the designated points and interleaves the first and second discrete signals to produce a combined signal having a sampling frequency greater than that of either the first or second discrete signals. The combined signal constitutes a nonlinear approximation of the time base error, and the read clock generator and phase modulator is responsive to the combined signal for controlling the readout of the reproduced signal from the main memory in such a manner as substantially to eliminate the time base error.
摘要:
A ball joint including a socket member having a recess therein for rockingly receiving a ball end of a ball member, and a retaining ring for retaining the ball end in the recess. The socket member is made of synthetic resin, and an annular plate member formed of metal is fitted in the recess for transmitting the force acting on the retaining ring from the ball member to the socket member.
摘要:
A white level clipping circuit has an impedance element through which a video signal is supplied from an input terminal to an output terminal, the emitter of a PNP-type transistor is connected to the output side of the impedance element and the collector thereof is grounded while the base of the transistor is supplied with a constant bias voltage to effect white level clipping of the video signal derived at the output terminal. This clipping circuit carries out positive clipping operation with no frequency characteristics and hence avoids possible overmodulation when the clipped video signal is frequency-modulated for the recording thereof.
摘要:
An engine-powered forklift truck including a work device which is hydraulically driven by an oil hydraulic pump whose driving source is an engine, and including a load handling interlock mechanism which brings a work device operation into a locked state by turning a key switch off or turning a seat switch off, includes: a release control apparatus configured to, when the locked state exists, release the locked state on condition that the key switch is ON, the seat switch is ON, and the engine is rotated under a predetermined engine speed or more.
摘要:
A shutter device comprising a fixed member which has a plurality of electrodes arranged on a surface, a light-transmitting region which is provided in the fixed member, a light-shielding member which is able to move between two positions where the light-transmitting region is closed and opened, respectively, and which have a plurality of electret parts, and a drive circuit which periodically applies a voltage to the electrodes provided on the fixed member, thereby to generate an electrostatic force acting on the electret parts of the light-shielding member and to drive the light-shielding member.