Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Feed control of material en route to shaping area
Reexamination Certificate
2003-01-10
2004-07-13
Heitbrink, Tim (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Feed control of material en route to shaping area
C425S149000
Reexamination Certificate
active
06761552
ABSTRACT:
TECHNICAL FIELD
The present invention generally relates to injection molding machines, and more particularly, to an injection molding machine having a detector where a storage medium is installed.
BACKGROUND ART
In an injection molding machine, resin heated and melted in a heating cylinder is injected into a cavity of a mold apparatus under high pressure so that the cavity is filled with the molten resin. The molten resin is then cooled and solidified so as to obtain a molded article.
Because of this, a plurality of driving parts and driven parts are provided in the injection molding machine. In addition, detectors are provided for the driving parts and driven parts so as to detect a driven state of the driven parts such as speed or positions of the driven parts.
For example, in an electric injection molding machine, a plurality of motors such as a servo motor for injection, a servo motor for screw rotating, a servo motor for mold clamping, and others, are provided as the driving parts. Furthermore, a screw, a cross head and others are provided as the driven parts. Rotation detectors, such as rotary encoders, are provided for output shafts of these servo motors. For example, the rotation detector recognizes a number of rotations and an amount of rotation of the servo motor and outputs a detection signal representing the recognized number of rotations and the recognized amount of rotation of the servo motor. The detection signal is used as a signal for detecting the speed and the position of the driven part that is driven by the output shaft of the servo motor. In a case where speed control for the driven part is implemented, the controller receives the driven signal from the rotation detector. The controller controls the number of rotations and the amount of rotation of the servo motor based on the speed represented by the detection signal. That is, the controller controls the number of rotations and the amount of rotation of the servo motor so as to make the driven part have a designated speed.
FIG. 1
is a block diagram schematically showing a feed back control system of a servo motor of a conventional electric injection molding machine. This block diagram shows minimum structural elements in order to simplify the explanation of the feed back control system. However, an actual feed back control system has a more complex structure than the block diagram.
Referring to
FIG. 1
, a rotation detector
22
is provided at an output shaft
25
of a servo motor
21
. A detection signal from the rotation detector
22
is input to a controller
20
through an interface circuit
23
. The detection signal from the rotation detector
22
is converted to a signal suitable for a digital process at the controller
20
by the interface circuit
23
. The controller
20
controls the number of the rotations and the amount of the rotation of the servo motor
21
, based on information with regard to the number of the rotations and the amount of the rotation of the servo motor
21
that is detected by the rotation detector
22
.
Meanwhile, in a case where the rotation detector
22
is provided at the output shaft
25
of the servo motor
21
, it is necessary to measure an original point of the servo motor
21
and store the original point as original point position information. This is because it is necessary to recognize the number of the rotations and the amount of the rotation of the servo motor
21
by using the original point as a standard so as to control the number of the rotations and the amount of the rotation of the servo motor
21
.
Furthermore, detector information, in addition to the original point position information of the servo motor
21
, is stored in order to distinguish the rotation detector
22
. The detector information is defined as individual information to distinguish the rotation detector uniquely. Information represented by a numerical value or a character such as from the alphabet, for example “a model of the rotation detector”, “a serial number”, “a version number” or the like, is applicable to the detector information. The injection molding machine has one controller
20
. Generally, the controller
20
controls a plurality of the servo motors of the injection molding machine in parallel. Hence, a plurality of the detection signals are input from the rotation detector to the controller
20
. In this case, it is necessary to distinguish from which rotation detector the detection signal is input. In addition, it is necessary to distinguish whether or not the input detection signal is from a proper rotation detector.
Thus, in the conventional electric injection molding machine, the original point position information of the servo motor
21
is combined with the detector information regarding the rotation detector
22
provided at the output shaft
25
of the servo motor
21
, and stored in a memory
26
installed in the controller
20
after the rotation detector
22
is provided for the servo motor
21
. In a case where a memory is installed in the interface circuit
23
, the original point position information of the servo motor
21
and the detector information are stored in the memory.
However, in the above mentioned conventional injection molding machine, it is necessary to implement an operation for detection of the original point position of the injection molding machine and store the original point position information of the servo motor
21
and the detector information of the rotation detector
22
in the memory
26
, again, whenever the rotation detector
22
is exchanged. In this case, for example, if a setting operation to input the information of the original point position after the rotation detector is exchanged is missed or if the injection molding machine where an improper rotation detector is provided at the servo motor
21
in error is operated, the injection molding machine works incorrectly.
Furthermore, in the above mentioned conventional injection molding machine, the original point position information of the servo motor
21
and the detector information of the rotation detector
22
has to be stored, whenever the interface circuit
23
having the original point position information and the detector information or the controller
20
is exchanged, or the rotation detector
22
and the interface circuit
23
having the original point position information and the detector information or the controller
20
are exchanged. Hence, operation for exchanging the interface circuit
23
, the controller
20
, or the servo motor
21
is complicated. As a result of this, human support for maintenance is required inconveniently, whenever the interface circuit
23
, the controller
20
, or the servo motor
21
is exchanged.
DISCLOSURE OF INVENTION
Accordingly, it is a general object of the present invention is to provide a novel and useful injection molding machine having a detector where a storage medium is installed.
Another and more specific object of the present invention is to provide an injection molding machine, including a driving part, a driven part driven by the driving part, and a detector detecting a driven state of the driven part, wherein a storage medium is installed in the detector.
The storage medium may be a one chip microcomputer. The one chip microcomputer is suitable as the recording medium since the one chip microcomputer has a memory and is distributed at a low price.
Detector information or molding machine information to distinguish the detector may be stored in the storage medium. The detector information may include the model of the detector, a serial number, or a version number, of the detector. The molding machine information may include information with regard to a serial number of the injection molding machine and a driving apparatus. The molding machine information may further include information with regard to a plasticizing capacity or mold clamping force. The driving part may be a motor. The detector may be provided at an output shaft of the motor. The driving part may be operated by supplying hydraulic pressure. The injection
Heitbrink Tim
Squire Sanders & Dempsey L.L.P.
Sumitomo Heavy Industrie's, Ltd.
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