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1. 发明专利

JPH04283807A SERVO CONTROLLER 失效
公开(公告)号：JPH04283807A
公开(公告)日：1992-10-08
申请号：JP7207391
申请日：1991-03-13
申请人： HITACHI SEIKO KK
发明人： KOBAYASHI TOSHIBUMI , YAMAWAKI YUJI , NAGAMORI KAZUHARU
IPC分类号： G05D3/12 , G05B19/416 , G05D19/02
摘要： PURPOSE:To prevent a vibration noise from being generated when a load is at a stop and to maintain silent environment by providing a data reducing means. CONSTITUTION:When the load moves, a gain switching decision part 9 sets the gain of a gain switching part 7 to '1' and the multiplication coefficient of a speed feedback switching part 8 to a specific value, and normal control is performed. When the load stops, the gain switching decision part 9 switches the gain of the gain switching part 7 and the multiplication coefficient of the speed feedback switching part 8 to specific lower values (or '0'). If the rotary shaft of a motor 17 turns between backlashes of a gear mechanism owing to disturbance during the stop of the load, position data Dp and speed data DF are outputted from a position detection part 2 and a speed detection part 3. The speed data DF is multiplied by the lower multiplication coefficient or '0' through a multiplication part 5a, so a value outputted to an addition part 5b becomes an extremely small valve outputted to an feedback gain is reduced, thereby suppressing the oscillation of the rotary shaft of the motor 1.

2. 发明专利

JPH0464499A APPARATUS FOR CONTROLLING VERTICAL MOVEMENT OF PEN OF AUTOMATIC DRAWING APPARATUS 失效
公开(公告)号：JPH0464499A
公开(公告)日：1992-02-28
申请号：JP17645690
申请日：1990-07-05
申请人： HITACHI SEIKO KK
发明人： NAGAMORI KAZUHARU , KOBAYASHI TOSHIBUMI
IPC分类号： B43L13/00
摘要： PURPOSE:To realize the soft landing of a pen, to increase the vertical moving speed of the pen and to carry out automatic drawing at high speed by providing an acceleration and deceleration signal generating circuit moving the pen to a desired height successively through acceleration, deceleration and constant-speed drivings when the pen is vertically moved. CONSTITUTION:When the output of an integration circuit 13 is -3V and an analogue switch H is turned ON, the signal obtained by adding the output of the integration circuit 13 and position output P through resistors R1a, R1b having the same resistance value is inputted to the input terminal of a phase compensation circuit 14. Therefore, a position servo is operated until the input of the phase compensation circuit 14 becomes 0V and, as a result, a pen 5 becomes stable at a position where the position output P becomes 3V. The output signal 30 of the integration circuit 13 is also applied to an acceleration and deceleration signal generating circuit 20 and the current command corresponding to an acceleration or deceleration current is added to the input of a constant current amplifier 2 by the change of the relative moving quantity of the pen at the time of the upward or downward movement of the pen 5. By appropriately adding acceleration and deceleration currents at the time of the vertical movement of the pen 5, the acceleration of the pen tip at the time of the contact with a recording medium 16 can be suppressed to the min. degree within a short time.

3. 发明专利

JPH01209196A DIGITIZER PLOTTER DEVICE 失效
公开(公告)号：JPH01209196A
公开(公告)日：1989-08-22
申请号：JP3411288
申请日：1988-02-18
申请人： HITACHI SEIKO KK
发明人： KOBAYASHI TOSHIBUMI
IPC分类号： B43L13/00 , G06F3/13
摘要： PURPOSE:To perform matching of a digitizer coordinate system and a plotter coordinate system to each other, adjustment of movements and expansive or contractive correction of coordinate planes easily and with high accuracy, by forming a mapping function between the digitizer coordinate system and the plotter coordinate system, converting read coordinate values in the digitizer coordinate system into coordinate values in the plotter coordinate system, and matching the two kinds of the coordinate values to each other. CONSTITUTION:A computer 5 sends instructions to a plotter controller 9 to drive a pen head 8, thereby positioning a coordinate indicator 12 in the pen head 8 to the origin A of a plotter coordinate system, a predetermined coordinate point B on an X-axis and a predetermined coordinate point C on a Y-axis, sends instructions to a coordinate reading signal generator 3 to generate a coordinate reading signal from the indicator 12, and causes a coordinate reading means 4 to read the coordinate values in a digitizer coordinate system for each of the points A-C. Based on the three known coordinate points A, B, C in the plotter coordi nate system and the coordinate values in the digitizer coordinate system, the computer 5 forms a function for mapping from the digitizer coordinate system onto the plotter coordinate system. Coordinate transformation for a designated coordinate value is conducted based on the mapping function, whereby the coordinate system of a digitizer device and that of the plotter device are matched with each other.

4. 发明专利

JPH01271300A AUTOMATIC DRAFTING DEVICE 失效
公开(公告)号：JPH01271300A
公开(公告)日：1989-10-30
申请号：JP10019888
申请日：1988-04-25
申请人： HITACHI SEIKO KK
发明人： KOBAYASHI TOSHIBUMI
IPC分类号： B43L13/00
摘要： PURPOSE:To remove a non-sensitive zone by providing an angle detector which detects the tilt angle, a means to calculate a correction value in accordance with the detected angle and the weight of a carrier and an amplifier which amplifies drawing data for output to a drive mechanism and at the same time, has its characteristics changed in response to said correction value. CONSTITUTION:A correction value arithmetic and logic operation means 15 receives the tilt angle theta of a drawing board 1 which is detected by an angle detector 14, calculates a specified correction value based on said angle theta and the known weight of a carrier 13, and outputs any voltage corresponding to the calculated correction value to an amplifier 11. Consequently, the characteristics of an X output voltage from the amplifier 11 change. If a voltage obtained by processing drawing data is entered to the amplifier 11 under a condition where the change of the X output voltage occurs, a drive voltage in accordance with the corrected characteristics of the amplifier 11 is output to the drive mechanism of the carrier 3. These corrected characteristics do not allow any non-sensitive zone to generate in the drive voltage. Therefore, a delayed response to the carrier 3 in its movement in a Y axis is prevented and the accuracy of bringing the carrier 3 to a stop position is maintained.

5. 发明专利

JPS63316108A DIGITAL CONTROLLER 失效
公开(公告)号：JPS63316108A
公开(公告)日：1988-12-23
申请号：JP15117087
申请日：1987-06-19
申请人： HITACHI SEIKO KK
发明人： KOBAYASHI TOSHIBUMI
IPC分类号： G05D3/12
摘要： PURPOSE:To eliminate and adjustable part by a variable resistor and to improve power efficiency by replacing an analog circuit by a digital circuit to suppress the power consumption of a power amplifier. CONSTITUTION:An adder 3 adds position error data DE and speed data DF. Since data is processed as digital data, it is possible to eliminate the adjustable part by replacing the analog circuit by the digital circuit. Also, a pulse width modulator 4 modulates the speed command value DM to pulse width at every period, and controls a motor 6 by the pulse string PM of the pulse width via a switching amplifier 5. In such a way, it is possible to replace the power amplifier used in a conventional device by the switching amplifier, and to reduce the power consumption.

6. 发明专利

JPH04312899A CONTROLLER FOR WRITING PRESSURE IN AUTOMATIC DRAFTING MACHINE 失效
公开(公告)号：JPH04312899A
公开(公告)日：1992-11-04
申请号：JP7895091
申请日：1991-04-11
申请人： HITACHI SEIKO KK
发明人： NAGAMORI KAZUHARU , KOBAYASHI TOSHIBUMI , OSAKA YOSHIHISA
IPC分类号： B43L13/00
摘要： PURPOSE:To draw high quality figures by removing irregularities in both a width and density of a drawn line. CONSTITUTION:A writing pressure feedback signal 110 based on an output of a strain gage 10 detecting writing pressure applied to a penholder and a writing pressure-setting signal 140 based on preliminarily set writing pressure are applied to a writing pressure control circuit 13. The writing pressure control circuit 13 compares the writing pressure feedback signal 110 with the writing pressure setting signal 140, generates such a current that their difference becomes zero, and applies said current to an actuator 2 to control the writing pressure.

7. 发明专利

JPH04285495A MOTOR DRIVE 失效
公开(公告)号：JPH04285495A
公开(公告)日：1992-10-09
申请号：JP4688391
申请日：1991-03-12
申请人： HITACHI SEIKO KK
发明人： NAGAMORI KAZUHARU , KOBAYASHI TOSHIBUMI
IPC分类号： H02P3/08 , H02P7/288
摘要： PURPOSE:To protect a switching element against damage upon occurrence of abnormal operation of motor. CONSTITUTION:The motor drive comprises means 70, 72 for producing driving signals according to a motor rotation command signal, switching means 50, 52, 54 for turning a motor 82 ON, OFF based on the driving signal, means 68 for detecting overcurrent flowing through the motor 82, a timer mean 78 for outputting an OFF command signal for a predetermined time based on a detection output from the overcurrent detecting means 68, and means 74, 76 for stopping production of the driving signal from the driving signal producing means 70, 72 during generation of the OFF command signal.

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