JPH0546901Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an ejector device for an injection molding machine with a rotary table.

(Conventional technology) Conventionally, in an injection molding machine with a rotary table,
As shown in FIG. 6, since the table 1 moves,
The ejector rod 15 is inserted into the upper and lower through holes 8' by the ejector cylinder 13 with the ejector rods 15 aligned with the upper and lower through holes 8' provided in the mold mounting portion 7 of the table 1.
The molded product release mechanism attached to the upper mold is activated.

(Problems to be Solved by the Invention) However, in such a conventional ejector device, it is necessary to push out the ejector rod 15 by a distance L shown in FIG. There is a limit to how much time it takes to make a mold. Additionally, when adjusting the cylinder stroke (ejector stroke) for multiple molds using the molded product release mechanism attached to each mold, a special cylinder with a variable stroke function must be used. With,
When an accurate stroke is required, mechanical stroke adjustment must be performed, and stroke adjustment is not always easy.

The present invention was made to solve the above-mentioned conventional problems, and it is possible to easily obtain an accurate ejector stroke while using a general-purpose cylinder with a constant stroke, and also to The purpose is to obtain the optimum ejector stroke for each mold.

(Means for solving the problem) The ejector device of the injection molding machine according to the present invention has the following features:
In an injection molding machine with a rotary table, in which multiple molds are placed on the top surface of the rotary table,
Each mold placement portion of the table is provided with upper and lower through-holes into which an ejector rod can be inserted, and an ejector stroke adjusting member separate from the mold is inserted into each of the upper and lower through-holes. It is characterized by:

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 5 showing an injection molding machine with a rotary table.

In the figure, reference numeral 1 denotes a rotary table, which is rotatably fitted to one of a plurality of tie bars 2, rotatably supported on a fixed platen 3 via a bearing 4, and can be rotated by a table drive device 5. It's becoming like that. On this table 1, a plurality of mold placement parts 7 on which the lower mold 6 can be placed are provided, for example, at four locations at 90° intervals, and for each mold placement part 7 of the table 1, an upper mold placement part 7 is provided. Upper and lower through holes 8 are formed by expanding the diameter from the lower part.

The lower mold 6 is placed and fixed on a mold placement part 7 of the rotary table 1, and an opening 9 is provided at the bottom of the mold 6, through which a stroke adjustment member 12, which will be described later, can be moved upward. It is being

Reference numeral 10 denotes an ejector pin, whose upper end side is inserted into the lower mold 6 so as to be movable up and down, and whose lower end is
It is connected by an ejector plate 11 supported on the mold part around the opening 9.

Reference numeral 12 denotes a stepped cylindrical stroke adjusting member, which is formed separately from the lower mold 6 and is attached to the rotary table 1.
The rotary table 1 The length is the sum of the thickness of the opening 9 and the thickness of the mold portion around the opening 9.

Reference numeral 13 designates an ejector cylinder, which is mounted on a fixed frame 14 that supports a fixed platen 3, etc., so as to face the lower mold 6 from which the molded product is released, with the rotary table 1 in between.
can be moved upward by a certain stroke required to release the molded product beyond L1+L2 as shown in Figure 3.

The tie bar 2 passes through the fixed platen 3 in a vertically slidable manner, and the lower end of the tie bar 2 is attached to the mold clamping plate 1.
6, and the upper ends thereof are connected to each other by a movable platen 18 on which an upper mold 17 is mounted, and are integrally moved up and down by a mold clamping device 19 having one end connected to a mold clamping plate 16.

Reference numeral 20 denotes a mold clamping force support device, in which a piston 21 is fitted into the fixed platen 3 so as to be movable up and down, and a ram 22 protruding from the upper surface of the fixed platen 3 is integrally connected to the piston 21. .

(Function) When the ejector rod 15 is moved upward by L1+L2 shown in FIG.
The stroke adjusting member 1 is inserted into the hole 8.
2 onto the ejector plate 11, and move the plate 11 through the ejector stroke L1 shown in FIG.
Since the molded product is moved upward by the same amount, the molded product release process is performed with a cylinder stroke of L1+L2, which is smaller than the conventional one by the table thickness.

If the ejector stroke L1 is to be shortened by the lower mold 6, a stroke adjusting member 23 shorter than the table thickness may be inserted and used, as shown in FIG. Also, ejector stroke L1
If the length is longer than the table thickness, as shown in FIG.
If the spacer 24 is brought into contact with the ejector plate 11 and the lower mold 6 is mounted on the rotary table 1, a stroke adjustment member 25 having a length corresponding to the table thickness + spacer thickness is inserted and used. good.

(Effect of the invention) As described above, the present invention is such that the ejector stroke adjustment member is inserted into the vertical through hole provided in each mold placement part of the table so as to be movable up and down, and used in combination with the mold. While using a general-purpose cylinder with a constant stroke, it is possible to easily obtain an accurate ejector stroke by selectively using the ejector stroke adjustment member (adjusting the length) without requiring any processing on the mold side. The optimum ejector stroke can be easily obtained for each mold for a plurality of molds on the same table.

It goes without saying that the ejector device of the present invention can be applied to an injection molding machine with a slide table, a two-color molding machine with a reversing device, etc.

[Brief explanation of the drawing]

Figures 1 and 2 are longitudinal sectional views showing the state before the start of the molded product release process according to an embodiment of the present invention, an enlarged cross-sectional view of the main parts along the line ˜, and Figure 3 is the molded product release process Cross-sectional views of the same essential parts showing the intermediate state, Figures 4 and 5
The figure is a cross-sectional view showing a modification of the same essential part, and a cross-sectional view showing the conventional example shown in FIG. 1... Rotary table, 6... Lower mold, 7...
... Mold mounting part, 8 ... Up and down through hole, 9 ... Opening, 10 ... Ejector pin, 11 ... Ejector plate, 12, 23, 25 ... Stroke adjustment member, 13 ... Ejector cylinder, 15...
Ejiektarod.

Claims (1)

[Scope of utility model registration request] In an injection molding machine equipped with a rotary table in which a plurality of molds are placed on the top surface of the rotary table, each mold placement part of the table is provided with upper and lower through holes into which an EJEC rod can be inserted. An ejector device for an injection molding machine, characterized in that an ejector stroke adjustment member separate from a mold is inserted into a vertical through hole.