JPH0223389Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a mold indexing device that can appropriately select and index a mold on a rotary table to a mold clamping position in a rotary injection molding machine. It is something.

(Prior art) Conventionally, in a rotary injection molding machine, a plurality of detected parts corresponding to each mold mounting part are provided around the rotary table, and the detected parts are arranged around the rotary table as the table rotates. A detector is provided to sequentially detect the detection signal, and each time a detection signal is input, the table driving device is stopped and the molds on the rotary table are sequentially sent to the mold clamping position (Japanese Patent Laid-Open No. 59-199223). (see official bulletin).

(Problem that the invention aims to solve) However, with this intermittent table rotation method, even if the mold to start the first mold clamping is determined, the operator must set it each time.
It takes time to set up the work. Also, even if you try to use only a part of all the molds, as mentioned above, the first mold to be used cannot be automatically set, so the amount of table rotation is used to distinguish whether or not the mold is used. Therefore, there was an inconvenience that selective use of molds was impossible.

(Means for Solving the Problems) A mold indexing device for a rotary injection molding machine according to the present invention has a rotary table having a plurality of rotatably supported mold mounting portions. A plurality of detection parts corresponding to the mold placement part and one or more auxiliary detection parts for selecting a predetermined detection part from among the detection parts are provided, and a detection part is provided around the rotary table. A main detector and an auxiliary detector are arranged to detect the detected part and the auxiliary detected part so that the mold on the mold mounting part corresponding to the detected part is located at the mold clamping position. In addition, an AND circuit is provided which calculates the AND of the detection signals input from both detectors and outputs a stop signal for the table drive device.With this configuration, the first mold to be used This makes it possible to reliably perform the indexing of the molds that enables the determination of the molds and the selective use of the molds.

(Example) The present invention will be described below with reference to an illustrated example in which the present invention is applied to a vertical rotary injection molding machine.

In the figure, reference numeral 1 denotes a fixed platen supported and fixed on a frame 2, and the platen 1 has a plurality of tie bars 4 (three in the embodiment) whose lower ends are connected by a mold clamping plate 3.
A mold clamping drive device 5 (cylinder in the embodiment) is installed, which is vertically slidably penetrated through the mold clamping plate 3 and has one end connected to the mold clamping plate 3.

A movable platen 6 is attached to the upper end of the tie bar 4, and an upper mold 7 is attached to the lower surface of the platen 6.

A rotary table 8 is rotatably fitted to one of the tie bars 4, rotatably supported on the fixed platen 1 via a bearing 9, and is driven by a table drive device 10 as shown in FIG. It can be rotated in the direction of the arrow. On this rotary table 8, there are a plurality of mold placement parts 12 (in the example, four places at 90° intervals) on which the lower mold 11 can be placed.
is provided.

A piston 13 is fitted into the fixed platen 1 so as to be able to move up and down.
A ram 14 (pressure receiving part) protruding from the upper surface of the fixed platen 1 is integrally connected. By this cylinder type mold clamping force support device, the rotary table 8 is supported from the side opposite to the upper mold 7 during mold clamping.

Reference numeral 15 denotes a detected part (dog in the embodiment) such as a notch or a dog, and a plurality of detection parts (dog in the embodiment) are arranged around the rotary table 8 in correspondence with each mold mounting part 12.
(1) provided. In FIG. 2, the correspondence relationships are shown as P, Q, R, S and p, q, r, s.

Reference numeral 16 denotes auxiliary detected parts (dogs in the embodiment) such as notches and dogs, and one or more (two in the embodiment) are arranged around the circumference of the rotary table 8, each of which is attached to a predetermined detected part of the detected parts 15. part (p in the example,
r) is provided in a removable manner.
In the example of FIG. 2, the combinations are shown as p and e, and r and f.

Reference numeral 17 denotes a main detector such as a limit switch or a proximity switch (proximity switch in the embodiment) used to detect each detected portion 15, and a mold corresponding to the detected portion 15(p) detected thereby. It is arranged at a position around the rotary table where the mounting part 12(P) can be placed at the mold clamping position.

Reference numeral 18 denotes an auxiliary detection section (proximity switch in the embodiment) such as a limit switch or a proximity switch used to detect the auxiliary detected section 16, when the main detector 17 detects the detected section 15(p). It is arranged at a position around the rotary table where the auxiliary detected part 16(e) can be detected at the same time.

Reference numeral 19 denotes an AND circuit for use when the auxiliary detected part 16 is used, and the input terminals A and B of this circuit 19 are connected to the main detector 17 and the auxiliary detector 18, respectively, and the output terminal F is connected to an injection molded A control device (not shown) that controls each operation of the machine is connected.

This AND circuit 19 includes the detection units 17 and 18.
The logical product of detection signals A and B input from (F=A,
B) and the stop signal F of the table driving device 10.
It is not used when the auxiliary detected part 16 is not attached. When the AND circuit 19 is not used, as shown in FIG. The stop signal is input directly to the control device, and the rotary injection molding machine is operated in the same manner as before.

(Function) When the rotary table 8 is rotated in the direction of the arrow shown in FIG. 2 by the table drive device 10, the main detector 17 and the auxiliary detector 18
5(p, r) and the auxiliary detected portion 16(e, f) are detected simultaneously, and detection signals A and B are output. The AND circuit 19 calculates the logical product and outputs a stop signal F for the table driving device 10. When this signal F is input to the control device, the table drive device 10 is stopped according to instructions from the control device, and the rotary table 8
rotation is stopped, and the mold 11 on the mold mounting portion P or R of the table 8 is indexed to the mold clamping position. On the other hand, where the auxiliary detected part 16 is not combined with the detected part 15, the detected part 15 (s, q)
are sequentially detected by the main detector 17 and the auxiliary detector 18, and only the detection signal A or B is output.
A stop signal is never output.

Therefore, the rotary table 8 moves from mold rest P to R, from R to P, and from mold rest S and Q on the way.
The molds 11 on the mold rests P and R are quickly indexed to the mold clamping position because the molds 11 on the mold mounting parts P and R are rotated without stopping at the mold clamping position, and the rotation in 90° increments is switched to the rotation in 180° increments. It can be done. The mold clamping operation is performed after positioning the rotary table 8 by driving positioning pins into holes (not shown) provided in the rotary table 8.

Furthermore, if one auxiliary detected part 16 is provided, the mold to be clamped first can be determined, and then the auxiliary detected part 16 is removed and the AND circuit 19 is not used and the same method as before is used. It can also be activated.

(Effects of the invention) As described above, the present invention has a simple configuration that includes an auxiliary detected part, an auxiliary detection part, and an AND circuit, and can quickly index and place a predetermined mold at the mold clamping position. The injection molding machine can be adapted to various usage conditions and its operability and productivity can be improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a plan sectional view taken along the line .about. in FIG. 1... Fixed platen, 3... Mold clamping plate, 4... Tie bar, 5... Mold clamping drive device, 6... Movable platen, 7...
Upper mold, 8... Rotary table, 10... Table drive device, 11... Lower mold, 15... Detected part, 16
... Auxiliary detected part, 17... Main detector, 18... Auxiliary detector, 19... AND circuit.

Claims (1)

[Scope of utility model registration request] A rotary table having a plurality of rotatably supported mold mounting parts has a plurality of detected parts corresponding to each mold mounting part, and a predetermined detected part among the detected parts. One or more auxiliary detected parts are provided around the rotary table so that the mold on the mold mounting part corresponding to the detected detected part is located at the mold clamping position. , a main detector and an auxiliary detector are provided to detect the detected part and the auxiliary detected part, and a stop signal for the table driving device is output by calculating the AND of the detection signals input from both detectors. A mold indexing device for a rotary injection molding machine, characterized by having an AND circuit.