JPH0346888Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a knock-out mechanism for a mold for knocking out a synthetic resin molded product, particularly a continuous molded product, using a mold.

[Background Art] When the molded product is such as a coil bobbin where a coil is wound around the outer periphery of the center body, if the knockout pin pushes the center body and knocks out, the knockout marks will remain on the center body. Fragments often cause the coil (wire diameter approximately 0.05mm) to break. For this reason, it is desirable to prevent the knockout pin from coming into contact with the center body of the coil bobbin.
If the coil bobbin has terminal blocks on both ends, it can be removed from the mold by pushing up both terminal blocks with a pair of knock-out pins. A side core is used to form the hole, and there is a problem of interference between this side core and the knockout pin, and in the case of continuous molding, there is also a problem with the separation of the knockout pin from the coil bobbin, which is a molded product. occurs.

[Purpose of the invention] The present invention was devised in view of these points, and its purpose is to be able to knock out a molded product without interfering with the side core, and to do so without leaving any marks or burrs. The object of the present invention is to provide a knockout mechanism for a molding die that can be used in a molding die.

[Disclosure of the invention] Accordingly, the present invention provides a first knockout pin that is in contact with the molded product, a second knockout pin that is separated from the molded product by interposing a side core between the molded product, and these knockout pins. and an ejector drive unit that knocks out a molded product by raising a pin, and the ejector drive unit includes an ejector plate to which a first knockout pin is attached, and a second knockout pin. It is characterized in that it consists of another ejector plate to which a pin is attached, and an interlocking member that raises the former ejector plate synchronously during an intermediate period excluding the early and late periods during which the latter ejector plate rises. It has the following.

The present invention will be described in detail below based on the illustrated embodiment.The embodiment shown in FIG. To explain, this is composed of an upper mold 20, a lower mold 21, and a side core 22 for forming a hole for inserting the iron core in the coil bobbin 10. When the upper and lower molds 20, 21 are opened, the side core 22 is It moves to the left in the figure by the inclined drive pin 23.

Two types of knockout pins are provided for knocking out the coil bobbin 10. The first knockout pin 1 is formed of a round pin, and its tip abuts against the lower surface of the terminal block portion 11 at one end of the coil bobbin 10, as shown in FIG. The second knockout pin 2 is formed of a pin with a square cross section, and its tip is located below the protrusion 12 formed at the other end of the coil bobbin 10 in relation to the side core 22. It's far from 10. Note that 15 in FIG. 3 is a hoop material in which a portion that will become a terminal pin is punched out.

On the other hand, below the mold plate 28 to which the lower mold 21 is attached, there are three ejector plates 31, 3.
2 and 33 are installed above and below. The uppermost ejector plate 33 is fixed to the lower end of the knockout pin 1, and the middle ejector plate 32 is the ejector plate 33.
The lower ejector plate 31 is suspended by a post 36 fixed to the lower ejector plate 31 to which the lower end of the ejector pin 8 is fixed.
The press ejector bar 35 is in contact with the lower surface of the press ejector bar 35. Further, a sleeve 38 is inserted through the upper and middle ejector plates 31 and 32, and the lower end of a lift pin 7 having a guide lifter 25 provided at the upper end is fixed to the middle ejector plate 32.

A spring 41 is connected between the template 28 and the middle ejector plate 32, and a spring 41 is connected between the middle ejector plate 32 and the upper ejector plate 3.
A spring 42 is disposed between the knockout pin 2 and the lower ejector plate 31, and a spring 43 is disposed between the lower end of the knockout pin 2, on which the sleeve 38 is disposed, and the lower ejector plate 31. ing. These springs 41, 42, 43 are provided to adjust the timing of the operation of each ejector plate 31, 32, 33 in order to obtain the operation of the knockout pins 1, 2, which will be described later.

After the molding of the coil bobbin 10, which is a molded product, is completed, the mold is opened as shown in FIG. However, at this initial stage, only the ejector plate 31 rises a little, so the knockout pin 2 and the ejector pin 8
is raised, and the ejector pin 8 is connected to the side core 22.
Projects forward in the mold clamping direction. The knockout pin 2 is connected to a protrusion 12 on the end surface of the coil bobbin 10.
touches the bottom surface of

Then, knockout pin 2 is connected to coil bobbin 1.
At the same time as the coil bobbin 10 contacts the lower surface of the protrusion 12 of the coil bobbin 1, the knockout pin 1 and the lift pin 7 start to rise together with the knockout pin 2, whereby the coil bobbin 10 is separated from the mold. Next, when the rise of both knockout pins 1 and 2 reaches a predetermined value, knockout pin 1 stops, but knockout pin 2 and lift pin 7 continue to rise, and coil bobbin 10 and knockout pin 1 Release the contact part with the tip surface. After this, the knockout pin 2 also stops, and only the lift pin 7 continues to rise, and the guide lifter 25, which receives the hoop material 15, holds the coil bobbin 10 in a floating state. The coil bobbin 10, which is a product, is fed and the next molding cycle begins. FIG. 2 shows an operation time chart of the knockout pins 1 and 2 and the lift pin 7.

The embodiment shown in FIG. 4 differs in the structure of the ejector plates 31, 32, and 33, and the ejector plate 33 is pulled up by a press. The same operation as in the example is performed, and the knockout pin 2 first comes into contact with the coil bobbin 10 as shown in FIG. After the coil bobbin 10 is removed from the mold and the knockout pin 2 is raised slightly, only the lift pin 7 is lifted, and the coil bobbin 10 is removed from the knockout pin 1. In addition, 45 in FIG. 4 is a stopper for regulating the amount of rise of the knockout pin 1.

[Effects of the invention] As described above, in the present invention, since the second knockout pin is installed apart from the molded product, there is no interference between the side core and the knockout pin even when a side core is used. In addition, the second knockout pin does not leave any marks on the molded product, and the molded product can be removed from the mold by raising the first and second knockout pins simultaneously. The molded product can be reliably removed from the knockout pin, and ultimately the molded product can also be removed from the first knockout pin by raising only the second knockout pin.

[Brief explanation of drawings]

Figures 1a, b, c, and d are cross-sectional views of an embodiment of the present invention; Figure 2 is a time chart showing the operation of the same;
FIGS. 3a and 3b are front and side views showing the contact position between the knockout pin and the molded product, and FIGS. 4a, b, c, and d are sectional views of other embodiments,
1 is a first knockout pin, 2 is a second knockout pin, 10 is a coil bobbin as a molded product, and 31, 32, and 33 are ejector plates.

Claims (1)

[Scope of utility model registration request] A first knockout pin that is in contact with the molded product, a second knockout pin that is separated from the molded product due to the interposition of a side core between the molded product, and a knockout pin that is separated from the molded product by raising these knockout pins. The ejector drive section includes an ejector plate to which a first knockout pin is attached, and another ejector plate to which a second knockout pin is attached. , and an interlocking member that raises the former ejector plate synchronously during an intermediate period excluding the early and late periods during which the latter ejector plate rises.