JP2503125Y2 - Knockout plate stroke adjustment mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an adjusting mechanism capable of adjusting a knockout plate stroke amount of an injection molding machine by power.

(Prior Art) FIG. 4 shows a side view of a platen device supporting one of the molds of a conventional injection molding machine and capable of opening / closing movement with the other mold supported by a die head, as seen from the rear side. 5 shows a sectional view taken along the line CC of FIG.

The platen device includes a platen body 2 that supports the mold 1,
A guide pin 3 attached to the platen body 2 and a cylinder attachment plate 4 attached to one end of the guide pin 3 are attached to a piston rod 5-1 of an ejector cylinder 5 attached to the cylinder attachment plate 4. Has a knockout plate 6 attached thereto, and the knockout plate 6 is slidable along the guide pin 3. That is, when the ejector cylinder 5 expands and contracts, the knockout plate 6 slides along the guide pin 3,
Moves closer to or farther from the platen body 2.

Further, an ejector rod 7 is attached to the knockout plate 6, and when the knockout plate 6 approaches the platen body 2 by the extension operation of the ejector cylinder 5, the resin molded product 8 molded in the mold 1 is ejected. The resin molded product 8 is taken out from the mold 1 by sticking out with the rod 7.

The amount of protrusion of the ejector rod 7 into the mold 1 is normally limited by detecting the position of the knockout plate 6 with the stroke sensor 9, but as a safety device against the error movement of the stroke sensor 9, The mechanical stopper mechanism 10 is attached to the knockout plate 6, and the mechanical stopper mechanism 10 strikes the platen body 2 to forcibly limit the amount of ejection of the ejector rod 7 into the mold 1.

By the way, since the protruding amount of the ejector rod 7 into the mold 1 is changed by the mold, the protruding amount of the mechanical stopper mechanism 10 from the knockout plate 6 is also
It needs to be adjusted each time.

Therefore, the mechanical stopper mechanism 10 is provided with a moving female screw 10-1 fixed to the knockout plate 6 as shown in the figure.
And the stroke adjusting bolt 10-2 fitted in it,
And a fixed nut 10-3 which meshes with this and sandwiches the knockout plate 6. Adjustment bolt 10-
When moving 2, the fixing nut 10-3 is loosened by manual rotation, the adjusting bolt 10-2 is manually rotated to move in the axial direction, and the fixing nut 10-3 is fixed by manual rotation at the set position. At the position where the tip of the adjusting bolt 10-2 hits the platen body 2, the position where the knockout plate 6 can approach the platen body 2 is limited, and as a result, the amount of protrusion of the tip of the ejector rod 7 into the mold 1 is limited. It

(Problems to be solved by the invention) In the conventional mechanical stopper mechanism 10, (1) a large tightening force is required for the fixing nut 10-3 to ensure the fixation of the stroke adjusting bolt 10-2, When tightening the lock nut 10-3 to lock it, or loosening the nut 10-3 to release the lock,
A large torque is required for both the rotation tightening torque and the rotation loosening torque of the fixed nut 10-3. (2) When the stroke adjusting bolt 10-2 is rotationally moved, the rotational torque is small but long stroke movement is required, so continuous rotation is required. Will be required.

However, torque tends to be insufficient when trying to rotate the fixed nut 10-3 driven by a motor, and it is difficult to drive the power. For this reason, the continuous rotation of (2) is forced to be done manually, and the stroke adjustment work of the knockout plate 6 at the time of exchanging the die 1 is all done manually, and the setup time becomes long.

Therefore, it is essential for the industry concerned in recent years to produce a wide variety of products in small quantities, by reducing the amount of manual work when changing molds, shortening the setup time, and improving productivity.Therefore, stroke adjustment of the mechanical stopper mechanism is essential. The demand for motivation of work is also increasing.

The present invention has been made in order to meet such a demand, and is intended to realize the power of the stroke adjusting work by adopting a simple mechanism.

(Means for Solving the Problem) In order to realize this, the present invention has a female screw for movement fixedly mounted on one surface of a knockout plate, and a fixing nut attached to the other surface side thereof, and the female screw and the fixing nut are rotated by power drive. A stroke adjusting mechanism for a knockout plate is constituted by interposing a stroke adjusting bolt for screwing, and a wedge mechanism that can be inserted / removed is interposed between the knockout plate and a fixing nut. It is what

(Operation) (1) In order to obtain and release a large tightening force, a wedge is interposed between the fixed nut and the knockout plate, and the inserting and pulling force is applied. In order to obtain a large tightening force, the wedge is inserted, and in order to release it, the wedge is pulled out. This utilizes the boosting effect of the wedge, and the wedge insertion and extraction forces may be small.

(2) After releasing the large tightening force, the stroke adjusting bolt can be rotated with a light torque.

(3) Use a hydraulic cylinder to insert and pull out the wedge,
By applying a motor to the continuous rotation of the adjusting bolt, the stroke adjusting operation of the mechanical stopper mechanism can be powered.

That is, the stroke adjustment bolt can be fixedly locked and unlocked by a wedge that is inserted / removed between the knockout plate (moving female screw) and the fixing nut when the hydraulic cylinder expands / contracts, and the stroke adjustment bolt is rotated by the sprocket (or gear). The stroke adjustment bolt can be easily moved in the axial direction by driving the stroke adjusting bolt.

(Embodiment) An embodiment of the present invention will be specifically described below with reference to the drawings.

FIG. 1 shows a stroke adjusting mechanism for a knockout plate according to the present invention, which replaces the conventional mechanical stopper mechanism 10 (FIG. 5). 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a view taken along the line BB of FIG.

The sprocket 21 (which may be a gear) is rotatably supported by the bearing portion of the sprocket support 20 attached to the knockout plate 6. A long key groove 24 extending in the axial direction is provided on the boss portion of the sprocket 21, and a key 23 is provided on the axial end of the stroke adjusting bolt 22. Then, the key 23 of the stroke adjusting bolt 22 is fitted into the key groove 24 of the sprocket 21, and the stroke adjusting bolt 22 is attached to the sprocket.
The shaft end of the stroke adjusting bolt 22 is passed through the boss hole of the sprocket 21 so that it can be rotated together with the sprocket 21 and can be slid in the boss hole of the sprocket 21 in the axial direction.

The other end of the stroke adjusting bolt 22 meshes with the moving female screw 10-1 fixed to the knockout plate 6.

A fixed nut 25 having a bottom inclined to the side opposite to the mounting surface of the female screw 10-1 for moving the knockout plate 6 is engaged with the stroke adjusting bolt 22, and the front surface is along the slope of the fixed nut 25, and the rear surface is a knockout surface. Plate 6
The wedge 26 formed so as to extend along the surface of the above is disposed between the fixed nut 25 and the knockout plate 6 so as to be slidable in the direction perpendicular to the axis of the stroke adjusting bolt 22. Also, the wedge 26
Is formed with a U-shaped groove so that the fixed nut 25 can be equally moved and equally moved, and can be slid with the stroke adjusting bolt 22 interposed therebetween. Further, the wedge 26 is connected to the rod of the hydraulic cylinder 28, and the wedge 26 is pulled out between the fixed nut 25 and the knockout plate 6 by the expansion and contraction operation of the hydraulic cylinder 28 to close the gap and generate a bracing force. The stroke adjusting bolt 22 is fixedly locked, or the fixed lock is released by making a gap to reduce the rotational force required to rotate the stroke adjusting bolt 22.

In addition, the fixing nut accompanying the rotation of the stroke adjusting bolt 22
A stopper frame 27 is attached to the rotating knockout plate 6 so that the fixing nut 25 can slide in a direction perpendicular to the axis of the stroke adjusting bolt 22 so as to prevent the wraparound of 25, and also serves as a guide for sliding the wedge 26.

That is, under such a configuration, (1) the wedge 26 is pulled out by the pulling operation of the hydraulic cylinder 28, the tension force between the fixed nut 25 and the knockout plate 6 or the moving female screw 10-1 is released, and the stroke adjustment is performed. Unlock the fixing lock of bolt 22.

(2) When the fixed lock of the stroke adjusting bolt 22 is released, the required torque for rotation of the stroke adjusting bolt 22 becomes lighter, and even if the sprocket 21 (or gear) is rotated by power, the stroke adjusting bolt 22 does not have the key 23 of the key 23. It works and rotates lightly. The stroke adjusting bolt 22 is a female screw 10-
The shaft end key 23 portion of the stroke adjusting bolt 22 slides along the key groove of the sprocket 23 and the boss inner diameter surface of the sprocket 21 as it rotates within 1.

(3) When the stroke adjustment bolt 22 reaches the set protrusion amount from the knockout plate 6 (predetermined stroke limit position of the knockout plate 6), the hydraulic cylinder 28 is extended and the wedge 26 is inserted between the fixing nut 25 and the knockout plate 6. The tensioning force is generated between the fixed nut 25 and the moving female screw 10-1 by the double action of the wedge when closing the gap, and the stroke adjusting bolt 22 is pulled to firmly lock it.

(Effect of the Invention) As described in detail above, according to the present invention, the stroke of the stroke adjusting bolt is adjusted by inserting and removing the wedge between the knockout plate (moving female screw) and the fixing nut 25 when the hydraulic cylinder expands and contracts. It is possible to lock and unlock the lock lever by using the wedge action, and when unlocking it, it is possible to rotate the stroke adjustment bolt with a light rotational force and realize the axial movement of the stroke adjustment bolt by power. This made it possible to release the stroke adjustment of the knockout plate from manual work and to power it.

Thus, labor can be saved by the stroke adjustment work of the knockout plate that is inevitable when the mold is replaced, and the speed can be increased, which facilitates the production of a wide variety of small quantities that meet the needs of the times.

[Brief description of drawings]

FIG. 1 is a sectional view of a mechanical stopper mechanism capable of stroke adjustment by power according to a typical embodiment of the present invention,
2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view taken along the line B- of FIG.
FIG. 4 is a rear side view of a conventional platen device, and FIG.
FIG. 5 is a sectional view taken along line CC of FIG. Explanation of main parts of figure 6 …… Knockout plate 10-1 …… Female screw for moving 22 …… Stroke adjusting bolt 25 …… Fixing nut 26 …… Wedge

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Shown 62-109918 (JP, U) Shown 63-144214 (JP, U) JP 37-16183 (JP, B1)

Claims (1)

(57) [Scope of utility model registration request] 1. A knockout plate is fixed to one surface with a female screw for moving, a fixing nut is attached to the other surface side, and a stroke adjusting bolt that is rotated by power drive is screwed onto the female screw and the fixing nut, and the knockout plate is also mounted. Stroke adjusting mechanism for knockout plate, characterized in that a wedge mechanism that can be inserted and removed is interposed between the fixing nut and the fixing nut.