JPH088096Y2 - Differential extrusion mechanism of injection molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a differential extrusion mechanism of an injection molding apparatus.

(Prior Art) As a differential extrusion mechanism of a conventional injection molding apparatus, there is a differential extrusion mechanism shown in FIGS. 4 to 6. FIG. 4 shows a differential extrusion mechanism before product extrusion. With this differential extrusion mechanism,
When the extrusion assist rod 12 is pushed upward, the eject plate 3 moves upward, and the eject plate 3
The eject pin 1 and the eject block 2 move upward in conjunction with the above, and the injection-molded product 5 is pushed out. FIG. 5 is a side view seen from the direction of the arrow in FIG. As shown in FIG. 5, the spring 14 arranged on the eject plate 3 biases and holds the holding pin 16 arranged on the plate 15 from the lateral direction to hold the eject plate 3 and the plate 15. I am letting you.

The eject distance of the eject pin 1 is equal to the eject block 2
It is set shorter than the extrusion distance of. That is, when the eject plate 3 pushes out a desired distance, the stop pin 13 which is interlocked with the eject pin 1 and the plate 15 comes into contact with the movable die 4 to prevent the eject pin 1 from being pushed out further. After that, when the eject plate 3 continues to push out, the force of the eject plate 3 moving upward overcomes the force of laterally urging the holding pin 16 of the spring 14 to hold the spring 14 and the holding pin. 16 leaves (Fig. 6). In this way, the eject plate 3 and the plate 15 are separated from each other, and only the eject block 2 continues to extrude, so that the product 5 is extruded.

(Problems to be solved by the invention) However, in the above-mentioned device, there is a limit to the force with which the spring urges and holds the holding pin 16, and if a larger urging and holding force is used by the spring, the component itself becomes larger. In addition, since the stop pin is provided, the eject plate itself becomes large, which causes a problem when the die itself takes up space.

Therefore, the technical problem of the present invention is to downsize the holding component,
Another object is to provide the eject pin itself with the function of the stop pin to provide a downsized differential pushing mechanism.

[Constitution of device]

(Means for Solving the Problem) The technical solution provided in the present invention for solving the above-mentioned problems is an eject block provided so that one end thereof is projected at an arbitrary position of a movable mold of an injection molding apparatus. An eject pin having an abutting means for contacting the movable die, the eject plate disposed at the other end of the movable die, an eject plate disposed at the other end of the eject block, and the eject pin. An eject plate disposed at the other end of the eject plate, and an eject plate holding means disposed in the eject plate for biasing and holding the eject plate, wherein the eject plate holding means is a resin biasing means and It is a differential extrusion mechanism of an injection molding apparatus characterized by comprising biasing force adjusting means for adjusting the biasing force of a resinous biasing means.

(Operation) The above technical problem operates as follows. That is, since the eject plate is held by the side surface of the resin instead of being held at one point by the tip of the spring, the holding force is strong, and the eject plate can be held by a small component. Further, since the eject pin itself has the contact means, it is not necessary to dispose the stop pin.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 shows a differential extrusion mechanism before product extrusion. In this differential extrusion mechanism, when the eject plate 3 is pushed out in the direction of the arrow in the figure, the eject pin 1 and the eject block 2 move upward in conjunction with the eject plate 3 to move the injection molded product 5. It is pushed out from the mold 4. A resin component 7 for urging and holding the eject plate is disposed on the lower surface of the eject plate 3. FIG. 2 shows an enlarged view of part A of FIG. As shown in FIG. 2, an adjusting block 8 and a taper bolt 9 are arranged on the eject plate 3, and the taper bolt 9 is a resin component 7.
Located in the center of. In this way, the resin component 7 is arranged on the lower surface of the eject plate 3. Further resin parts 7
Is abutted against the concave portion 6a of the eject plate 6 arranged at the lower end of the eject pin 1, and biases and holds the eject plate 6.

A hexagonal bolt hole (not shown) is provided on the lower surface of the taper bolt 9, and the resin component 7 is axially compressed by tightening the bolt hole, so that the resin component 7 and the eject plate 6 are And the resin component 7 urges and holds the eject plate 6 more strongly. Further, by fixing the position of the adjustment block 8 to a fixed position in advance, the tightening of the taper bolt 9 can be restricted.

In this embodiment, two resin parts 7 are arranged,
At least one resin component may be provided, and the number can be increased. Further, as the resin component, a resin having excellent wear resistance such as 6,6 nylon can be used, and the wear resistance can be further improved by coating the resin surface with a coating.

Thus, when the eject plate 3 moves in the direction of the arrow in the figure, the eject block 2, the eject plate 6 and the eject pin 1 held by the biasing force of the resin component 7 are held.
Move in the direction of the arrow shown in the figure. Edgeect pin 1
Has a step portion 10 that comes into contact with the movable die 4, and when the eject pin 1 continues to push out, the step portion 10 comes into contact with the step portion 11 of the opposing movable die 4 and the movement of the eject pin 1 is hindered. After that, when the eject plate 3 continues to push out, the pushing force overcomes the force of the resin component 7 for biasing and holding the eject plate 6, and the eject plate 6 and the resin component 7 separate (FIG. 3). In this way, the extrusion of the eject pin 1 is completed, and only the eject block 2 continues to extrude and extrudes the product 5.

As described above, since the eject plate 6 is biased and held by the entire side surface of the resin component 7, even if the resin component 7 itself, which is the eject plate retaining means, is small, a large holding force can be exerted, and the eject plate retaining member can be retained. The means can be miniaturized. Further, by fixing and adjusting the adjusting block 8 at a fixed position, the tightening degree of the taper bolt 9 can be limited, so that it is possible to prevent the eject plate 6 from being separated due to excessive tightening. That is, if the adjustment block 8 is adjusted in advance, the taper bolt 9 can be fully tightened to obtain a desired bias holding force.

Further, the stepped portion 10 provided on the eject pin 1 contacts the stepped portion 11 of the movable die 4 to stop the advance of the eject pin 1. Therefore, it is not necessary to dispose a stop pin newly, and the device can be downsized by the space of the stop pin.

[Effect of device]

According to the present invention, since the eject plate is biased and held by the entire side surface of the resin part, even if the resin part itself which is the eject plate holding means is small, a large holding force can be provided, and the eject plate holding means can be provided. It can be miniaturized.

Further, the contact means provided on the eject pin stops the advance of the eject pin. Therefore, it is not necessary to dispose a stop pin newly, and the device can be downsized by the space of the stop pin.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, which is a sectional view of a differential extrusion mechanism of an injection molding apparatus in a state before the eject plate and the resin component are separated from each other, and FIG. FIG. 3 is an enlarged view of part A, and FIG. 3 is a cross-sectional view of the differential extrusion mechanism of the injection molding apparatus after the product is extruded. FIG. 4 shows a conventional differential pushing mechanism,
FIG. 5 is a cross-sectional view of the differential extrusion mechanism of the injection molding apparatus before the product is extruded, FIG. 5 is a side view seen from the direction of the arrow in FIG. 4, and FIG. 6 is the injection molding after the product is extruded. Figure 3 shows a cross-sectional view of the differential extrusion mechanism of the device. Explanation of symbols 1 ... Eject pin, 2 ... Eject block, 3
…… Eject plate, 4 …… Movable type, 6 …… Eject plate, 7 …… Resin parts, 8 …… Adjustment block, 9 ……
Taper bolt, 10 …… Abutting part.

Claims (1)

[Scope of utility model registration request] 1. An eject block having one end projecting at an arbitrary position of a movable mold of an injection molding apparatus, and an movable block having an end projecting at an arbitrary position of the movable mold. An eject pin having a contact means, an eject plate disposed at the other end of the eject block, an eject plate disposed at the other end of the eject pin, and the eject plate disposed at the eject plate. An eject plate holding means for biasing and holding the plate, wherein the eject plate holding means comprises a resin biasing means and a biasing force adjusting means for adjusting the biasing force of the resin biasing means. Differential injection mechanism of injection molding equipment.