摘要:
Disclosed is an optical disk handling system (24), called an autochanger, having two control systems (150Y, l50Z) to provide the six motions necessary to move optical disk cartridges from storage holding cells to an optical drive. The system uses shaft encoders (62, 72) on two motors (60, 70) of the two control systems, and current or voltage feedback from the motors, for all positioning, and for detecting the location of the mechanisms during, and at the end of, moves. The shaft encoders (62, 72) are used to position a mechanism close to the eventual move location, then motor current or voltage feedback is used to determine the opposition to the movement of the mechanism, which tells the control system whether the mechanism has reached its destination. A human operator can enter a cartridge into the system through a mailslot (41), which is rotatable to properly receive or eject cartridges. The control systems use a flip assembly (49) in the autochanger to turn the cartridge over, allowing either side of the disk to be arranged for reading or writing by the optical drive. The control systems use a lateral displacement assembly (51) to move a cartridge from a cell in one of the two columns of the autochanger to a cell in the other column, or to move a cartridge between the optical drive, which is located in one of the columns, to a cell in the other column. The control systems use a cartridge engaging assembly (45) to attach to an exposed end portion of a cartridge positioned in a cell or the optical drive. A longitudinal displacement assembly (47) is used by the control systems to move the cartridge, after attachment, out of the cell or optical drive. After positioning the cartridge vertically and laterally, the longitudinal displacement assembly (47) is then used to move the cartridge into a cell or the optical drive, where the engaging assembly (45) releases the cartridge. An important aspect of the invention is that the longitudinal displacement assembly (47), the flip assembly (49), the lateral displacement assembly (51), the engagement assembly (45), and the mailslot assembly (41) are operated by one of the two control systems. The other of the two control systems is used for vertical displacement of the cartridge.
摘要:
A robot controller enables the robot to hold a work by a robot hand and to stack it on a predetermined place or take it down. The robot controller has memory means (3) for storing a plurality of approaching patterns in relation to the movement of the hand. This controller can arbitrarily set a path pattern from stacking the work from a position where the robot hand starts to move to a poistion where the work is taken down, as well as a path from the point of operation to the position where the robot hand ceases to move, depending upon the kind of work and the position of operation. The controller can also change the attitude of the robot hand at a position of operation.
摘要:
A numerical controller which gives an instruction to a machine tool that uses a main shaft motor (5) to return to the origin, in order to control the position of a tool. The main shaft can be returned to the origin by simply giving an instruction for returning to origin to a main shaft amplifier (SPA) that drives the main shaft motor (5). Prior to CNC-operating the machine tool according to the invention, the grid shifting amount (P 2 ) determined by a relationship of the main shaft motor (5) and the object to be controlled is set to the side of the spindle amplifier (SPA), and position data (P 3 ) corresponding to a distance from the origin of machine to a machining starting point transferred prior to a predetermined position stop instruction and the grid shifting amount (P 2 ) are added up together. Therefore, when the instruction for returning to origin is produced from the numerical controller to the spindle amplifier, the position control is automatically assumed, and the moving operation is started with respect to a desired position.
摘要:
A hybrid sample rate servo motor employing rate feedback compensation is disclosed. The system employs a shaft encoder (55) having a predetermined resolution to provide position data which are pulses indicating the shaft has moved another resolution unit. Under high motor velocity conditions the rate compensation feedback loop (60) is operated at a conventional constant sample rate. Under low velocity conditions, the sample rate at which the rate compensation feedback loop is operated is modified so that rate samples are taken and calculated only when new position data are available from the motor encoder. Rate quantization error is substantially reduced, thereby leading to more robust controller operation.
摘要:
In an injection molding machine employing a servo motor as a source for driving the injection axle to drive the screw in the axial direction, a method is provided to smoothly shift the dwelling step to the metering/kneading step, in order to prevent the error register in the servo circuit from overflowing and to prevent the injection molding machine from coming into halt. When the dwelling step is finished, the error register is followed up (steps S6 to S8) such that the error quantity stored in the error register of the servo circuit that drives the servo motor for injection axle becomes zero. Then, a torque limit value to be applied to the servo motor is switched from a setpoint value for dwelling to a setpoint value for metering and kneading (step S11). The error register is then followed up again over a predetermined period of time from when the torque limit value is switched (step S13), and the step is shifted to the metering/kneading step (step S14).
摘要:
After a deceleration limit switch (29) has been restored in performing the control for returning to origin, a position of lattice point at which a one-turn signal (RTS) is generated from the rotary encoder (24) for the first time is set to be the origin. In an origin return mode (ZRN = 1) in which a mechanical moving part returns to the origin, a numerical control unit (21) regards a position at which a rotary encoder (24) generates the one-turn signal (RTS) as zero, and monitors an instructed position REF0 until a next one-turn signal is generated for every predetermined period of time, and repeats the monitoring of such an instructed position until the moving part reaches near the origin. When the moving part approaches the origin and the deceleration limit switch (29) is restored, the instructed position REF0 at the first time is found for every DELTAT, and a distance (N - REF0) from the instructed position to a position at which a next one-turn signal is generated is sent as a final instructed moving amount to a digital servo circuit (22), so that the moving part returns to the origin. Here, N represents a distance between the lattice points.
摘要:
In order to compensate for errors in the positioning of a tool by a servo motor (4) resulting from mechanical inaccuracies in the machine tool slides (2) and drive (3), an analogue error compensation signal (12) is generated by a compensation unit (1) in which is stored calibration data relating to the components of the positioning error. The error compensation signal (12) is summed by a summation unit (14) with the uncompensated analogue position error signal (7) generated at the output of a CNC controller (5), and the resulting signal (15), as modified by the usual velocity feedback signal 10′ from the servo motor (4), is used to drive the servo motor (4). The resolution of the error compensation signal (12) is arranged to be greater than that of the position error signal (7), which is generally limited by the number of bits of the digital to analogue converter in the output stage of the controller (5). As the demand position is closely approached the servo (4) is driven substantially by the error compensation signal (12).
摘要:
A numerical control device comprising means (9) having a table/function which represents the motor current of a servo motor, in a servo mechanism (2) for servo-controlling a mechanical movable part, which is detected at a given time instant and the corresponding amount of lost motion correction. The position error caused by the lost motion can be correctd with high accuracy.
摘要:
A novel closed loop direct position feedback control method and recording apparatus for producing on a recording medium a plurality of successive print lines or otherwise component images. An appendant demarcation device provide for the proper abutting and spacing of each independent print character to prevent or minimize any perceived "banding" in the printed image. The apparatus includes a device for transporting the medium along a path orthogonal to the print head, a recording station in the path and having a translating head for inking, pring, or otherwise suitable device, for producing single lines or swaths of print in conjunction with the indexed advance of the medium relative to the print head. The transport device is operative to advance a first print line or swath through the recording station to form a first print line, to identify and store the position coordinates of each print line or swath, and to advance the recording medium for successive line or swath printing. The direct position feedback control apparatus also includes demarcation sensing and printing device for relative positioning, whereby the distance between the location of any sensed or printed demarcation reference and the next successive print line is controlled such that each print line will neglect the positioning error in any previous print line or swath.