摘要:
A disclosed multiple rotating absolute encoder comprises an encoding plate with a first pattern and a second pattern formed thereon, a first detection unit for reading the first pattern and outputting an information in one rotation of the encoding plate, a second detection unit for reading the second pattern and outputting a first rotation information of the encoding plate, a calculation unit for calculating a second rotation data based on the information in one rotation and the first rotation data, a selection unit for monitoring a rotation speed of the encoding plate and selecting either the first rotation data or the second rotation data in accordance with the rotation speed, and a data calculation unit for calculating rotation information of the encoding plate on the basis of either the first rotation data or the second rotation data selected by the selection unit and the information in one rotation.
摘要:
Each component of a modular encoder can be formed so as to be fixed to a rotary shaft of a rotating unit in a horizontal direction (a direction of a shaft line of a rotary shaft). Consequently, the modular encoder can easily be assembled and fixed, and reliability of fixation can be enhanced at the same time. In addition, the modular encoder has an elliptical shape so that a size thereof can be reduced in a direction in which a dimension should be decreased. Furthermore, if the holding member is rotatably fitted in the locking member in such a manner that the holding member can be rotated around the rotary shaft of the rotating unit, a sign plate can easily be aligned.
摘要:
An encoder includes a code plate, a detector, a transformer, and first and second calculators. The code plate is formed with an absolute pattern including a plurality of bit patterns, each bit pattern formed by a predetermined number of bits and representing one absolute position. The detector moves relatively with respect to the code plate, has a plurality of detecting elements arranged to be opposed to the predetermined number of bits, and reads the bit pattern from the absolute pattern to output a bit pattern signal representing the bit pattern. The transformer can transform only specific bit pattern signals corresponding to specific bit patterns out of a plurality of the bit pattern signals corresponding to the plurality of bit patterns, into the absolute positions. The first calculator calculates a relative, positional relation between the bit pattern corresponding to the bit pattern signal, read from the detector, and the specific bit pattern. The second calculator calculates information indicating a position of the code plate relative to the detector, based on the absolute position obtained by the transformer and the relative, positional relation obtained by the first calculator.
摘要:
An absolute encoder having a coder in which an incremental pattern and an absolute pattern are arranged in parallel and a detector including sensors for detecting the incremental pattern and the absolute pattern respectively. The absolute encoder comprises a discriminater to discriminate a relative phase position of the coder and the detector in one pitch of the incremental pattern from an output of the sensor for detecting the incremental pattern, and a signal generator to generate a synchronizing signal when a discriminated phase position coincides with a predetemined phase position by means of an electric circuit in one pitch of the incremental pattern. The absolute pattern is read on the basis of the synchronizing signal at a position except for the boundary region between the minimum reading units.
摘要:
An absolute position detection encoder includes a coder having a track provided with first graduations of an absolute pattern and second graduations of an incremental pattern, plural sensors movable relative to the coder along the longitudinal direction of the track, and a signal processing circuit for processing detection pulse trains, obtained upon reading the first graduations by the sensors, in synchronism with the time point corresponding to approximately the mid position of the minimum reading unit of the first graduation. The encoder outputs the relative position between the coder and the sensors in the form of parallel code signals as the absolute position read out from the absolute pattern graduations on the coder. By detecting the absolute pattern in synchronism with the time point corresponding to substantially the middle of the minimum reading unit of the first graduations, an absolute position detection signal of the correct code contents free of readout errors may be taken out for both the forward and reverse directions of the relative movement. On account of the signal selection function by the binary repetitive rectangular signal obtained from the incremental pattern reading results, the absolute position detection signal of the correct code contents may be taken out simultaneously with turn-on of the power source. The binary repetitive rectangular signal may also be used for generating a sub-scale signal for substantially improving the resolving power.
摘要:
An encoder system includes: a first single-rotation absolute encoder that outputs a first signal corresponding to an angular position of a first rotatable shaft; a power transmission device that transmits the power of the first shaft to a second rotatable shaft with a predetermined transmission ratio; a second single-rotation absolute encoder that outputs a second signal corresponding to an angular position of the second shaft; and a signal processing section that generates data related to the rotation count of the first shaft based on at least the first signal and the second signal.
摘要:
An encoder system includes: a first single-rotation absolute encoder that outputs a first signal corresponding to an angular position of a first rotatable shaft; a power transmission device that transmits the power of the first shaft to a second rotatable shaft with a predetermined transmission ratio; a second single-rotation absolute encoder that outputs a second signal corresponding to an angular position of the second shaft; and a signal processing section that generates data related to the rotation count of the first shaft based on at least the first signal and the second signal.