Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Mold motion or position control
Patent
1985-07-08
1987-09-29
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Mold motion or position control
264 405, 425162, 425167, 425171, 425590, 4254512, B29C 4580
Patent
active
046966323
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a mold opening/closing speed control device in an injection molding apparatus and, more particularly, to a mold opening/closing speed control device wherein a carrier acceleration/deceleration position, determined by a mold clamping mechanism for opening/closing molds, is numerically taught and stored in the control device.
In mold opening/closing speed control of a mold clamping mechanism in a conventional injection molding apparatus, a limit switch, a proximity switch, or the like is arranged at an acceleration/deceleration position to control a mold opening/closing speed. For this reason, the position of the limit switch, the proximity switch or the like must be precisely adjusted. As a result, reliability of such a switch determines the reliability of the control device itself, resulting in inconvenience.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to solve the conventional problem and provide a mold opening/closing speed control device which does not employ a switch such as a limit switch, and which is used in an injection molding apparatus.
It is another object of the present invention to provide a mold opening/closing control device in an injection molding apparatus, wherein an acceleration/deceleration position of a mold opening/closing speed can be numerically taught.
In order to achieve the above objects of the present invention, there is provided a mold opening/closing speed control device in an injection molding apparatus, comprising teaching/operation mode selecting means for selecting one of a teaching mode for teaching an acceleration/deceleration position of a mold opening/closing speed and an operation mode for opening/closing molds; teaching means for instructing the acceleration/deceleration position; memory means for storing the acceleration/deceleration position; mold driving means for moving the molds; and position detecting means for detecting a moving position of the molds; and control means for, in the teaching mode, causing the mold driving means to move the molds at a low speed and storing in the memory means a mold position detected by the position detecting means in response to an instruction from the teaching means, and for, in the operation mode, changing the opening/closing speed of the molds in accordance with the mold position stored in the memory means.
According to the present invention, the acceleration/deceleration position of the opening/closing speed of the molds can be arbitrarily taught, and a position for changing the mold opening/closing speed can be easily set even if the molds are replaced with other molds, thereby providing optimal mold opening/closing speed control for the corresponding molds. Unlike the conventional control device, an installation position of the limit switch or the like need not be adjusted, and operation can be simplified.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of a mold opening/closing speed control device according to an embodiment of the present invention; and
FIGS. 2(a), 2(b) and 2(c) are flow charts for explaining the operation of the device of FIG. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows a mold opening/closing speed control device according to an embodiment of the present invention. Reference numerals 1 and 3 denote bases; and 2, a carrier. Molds 8 and 9 are mounted on the base 1 and the carrier 2, respectively. A ball screw 4 is fixed on the carrier 2. A nut 5 threadably engaged with the ball screw 4, a gear 6 integrally formed with the nut 5, a gear 7 meshed with the gear 6, and a servo motor M for driving the gear 7 constitute a mold driving means. The carrier 2 is moved by the mold driving means in the right-and-left direction of FIG. 1.
Reference numerals 10 and 10' denote tie bars. Reference symbol PC denotes a position sensor serving as a position detecting means for detecting a rotati
REFERENCES:
patent: 3616495 (1971-11-01), Lemelson
patent: 3857658 (1974-12-01), Muzsnay
patent: 4540359 (1985-09-01), Yamazaki
Fanuc Ltd
Heitbrink Timothy W.
Woo Jay H.
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