Boots – shoes – and leggings
Patent
1986-06-30
1988-09-27
Lastova, John R.
Boots, shoes, and leggings
364188, 364558, 425149, 425150, 425170, 425171, 264 405, G06F 1546
Patent
active
047746750
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a monitor device of an injection molding machine for monitoring a relationship between the screw position and the internal die pressure.
In conventional injection molding machines, the screw is moved in the axial direction using hydraulic pressure to perform injection. The screw position is detected by a potentiometer or the like in the injection step, the resin pressure within the die is detected by a sensor, and the relationship between the screw position and the internal die pressure is monitored as a reference for changing injection conditions, such as injection speed, of the next injection.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an injection molding machine which uses a servo motor as a drive source for an injecting operation, which is controlled by numerical control, and which allows the type of monitoring described above.
In order to achieve the above object, according to the present invention, there is provided a monitor device used in an injection molding machine which performs injection by moving a screw along the axial direction using a servo motor. The monitor device comprises a detector for detecting a screw position, a counter for counting pulses from the detector, a first memory for storing the count of the counter, an internal die pressure sensor for detecting a pressure in a die, an analog/digital converter for converting a pressure detection signal from the internal die pressure sensor into a digital signal, a second memory for storing an output from the analog/digital converter, an address switching circuit for switching an address for accessing the first and second memories in accordance with write and read modes, an address generator for generating a sequentially updated address, and a display unit. During injection, the count of the counter and the output from the analog/digital converter are sequentially stored at addresses in the first and second memories which are sequentially designated by the output from the address generator supplied through the address switching circuit. The counts stored in the first and second memories are read out in response to a monitor command through the address switching circuit which has performed switching, and a relationship between the screw position and the internal die pressure is displayed on the display unit.
In this manner, according to the present invention, in an injection molding machine using a servo motor for moving the screw in the axial direction so as to perform injection, the screw position and the internal die pressure are sequentially updated and stored upon injection, so that the relationship between the screw position and the internal die pressure can be monitored whenever it is necessary. The screw position is detected by a detector, such as a pulse coder, provided on the servo motor which moves the screw. Therefore, an exact screw position can be detected with a simple structure.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1, 1a, and 1b are block diagrams of a monitor device according to an embodiment of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIGS. 1a and 1b are block diagrams showing an embodiment of the present invention. A numerical controller 10 controls the injection molding machine. Only the part of the numerical controller 10 which is concerned with the present invention is shown. A central processing unit 11 controls the injection molding machine in accordance with a control program stored in a memory (not shown). A CRT control circuit 12 displays the relationship between a screw position and an internal die pressure, to be described later, on a CRT display unit 25. A pulse distributor 13 supplies pulses to a servo circuit 26 in order to drive a servo motor 27 and move a screw 29 of the injection molding machine in the axial direction, thereby injecting an injection material within a heating cylinder 32 into a die 30. Note that the servo circuit 26 receives feedback pulses from a position detec
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Fanuc Ltd
Lastova John R.
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