JPH0342981Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a plunger mechanism of a manual molding machine.

[Prior Art and Problems] As a method of directly connecting optical fibers using a connector on-site, a method of directly molding a connector onto the optical fiber has been considered.

Fig. 2 shows a plunger drive mechanism of a manual molding machine that performs molding using manual molding pressure, Fig. A is a side view including a partial cross section, and Fig. B is a rear view.

1 is a guide cylinder, 2 is a cylinder cap, 3 is a plunger head, 4 is a plunger guide shaft, 5 is a guide shaft cap, 6 is a bush, 7 is a rotating shaft rod, 8 is a handle, 9 is a steel ball, 1
0 is the grip of the handle, and 11 is the flange.

The figure shows a state in which the plunger head 3 fixed to the axis of the plunger guide shaft 4 is extended to its maximum stroke due to rotation of the handle 8. The rotating shaft rod 7 to which the handle 8 is attached is screwed into the center hole of the cylinder cap 2 by a screw formed on its surface, and the rotating shaft rod 7 has a flange 11 at its tip, and inside this flange 11, A guide shaft cap 5 screwed onto the other end of the plunger guide shaft 4 is held via a bush 6, and the flange 11 is centered on its outer side, and a steel ball is held at the center of the side end face of the plunger guide shaft 4. They face each other with 9 in between. By rotating the handle 8, the rotating shaft rod 7
rotates, and the flange 11 at its tip advances to the illustrated position. During this time, the flange 11 pushes the plunger guide shaft 4 through the steel ball 9, and the plunger head 3 advances. When the handle 8 is rotated in the opposite direction from the illustrated position, the back surface of the flange 11 rotates while pushing the end face of the guide shaft cap 5, and the plunger guide shaft 4 connected to the guide shaft cap 5 is moved backward. become.

By the way, when the plunger head 3 is moved forward or backward by manual rotation of the handle 8, the biggest problem is that the plunger head 3 is moved forward by the operation of the handle 8. , this is the stage of applying molding pressure to the resin.

Since the plunger head 3 is directly advanced by operating the handle, if there is even a slight change in the manual force, the direct molding speed and molding pressure will change, which may result in deviations from the conditions specified for resin molding. Therefore, it cannot be said that highly reliable molding is being performed.

[Means for solving the problem] In order to eliminate the above-mentioned drawbacks of manual molding machines, the present invention transmits the molding pressure applied to the resin via a spring, thereby avoiding manual force changes from directly affecting molding. It was devised in such a way.

The present invention will be explained below with reference to the embodiment shown in FIG. The same parts as in FIG. 2 are indicated by the same reference numerals.

In the figure, 1 is a guide cylinder, and 2 is a cylinder cap. Further, 3 is a plunger head, 4 is a plunger guide shaft made of a cylindrical body, and 5 is a ring-shaped guide shaft cap.

7 has a flange 11 in the middle, and the flange 11
The upper part is a rotating shaft rod with a thread formed on the outer circumferential surface, and a guide shaft cap 5 is held on the rotating shaft rod 7 via a bush 6 above the flange 11, and the guide cap 5 is made of a cylindrical body. It is screwed onto the upper inner peripheral surface of the plunger guide shaft 4.

Further, 12 is a coil spring, and 13 is a receiving plate placed on a steel ball 9 held at the center of the bottom surface of the plunger guide shaft 4 made of a cylindrical body.

Place the receiving plate 13 on the steel ball 9 of the cylindrical plunger guide shaft 4, insert the coil spring 12, and further insert the rotary shaft rod 7, and engage the bush 6 to the rotary shaft rod 7 in advance. The combined ring-shaped guide shaft cap 5 is passed through, and the guide shaft cap 5 is connected to the cylindrical inner peripheral surface of the plunger guide shaft 4, and this assembly is placed inside the guide cylinder 1.
The cylinder cap 2 is fitted in such a way that it slides, and the cylinder cap 2 is screwed into the center screw hole with the rotary shaft rod 7, and is then fixed in alignment with the upper flange of the guide cylinder 1. After that, move the handle 8 to the rotating shaft rod 7.
Attach at the end.

14 is a board that supports the plunger mechanism; 15 is a resin attached below the board 14;
For example, this is a heating section for resin pellets, and although not shown, a heater is installed around the heating section 15.
The center of the hole is aligned with the center of the plunger head 3, and the outer diameter of the plunger head 3 is made to approximately match the hole diameter of the heating section 15. Reference numeral 16 indicates a mold that can move up and down, and the figure shows a state in which it is in contact with the heating section 15.

Furthermore, although the figure shows the rotary shaft rod 7 in an upwardly raised state, by manually operating the handle 8, the rotary shaft rod 7 is lowered and the flange 11 of the rotary shaft rod 7 and the receiving plate 13 of the plunger guide shaft 4 are connected to each other. The plunger head 3 is compressed by compressing the coil spring 12 interposed therebetween.
applies molding pressure to the softened resin in the heating section 15. In this case, even if there is a slight change in the movement of the handle 8 turned by hand, the plunger head 3 will be driven with a balance between the molding pressure and the spring force because the coil spring 12 is used. This can avoid manual force changes directly affecting molding speed and molding pressure.

[Effects] As explained above, according to the present invention, changes in manual force do not directly affect molding speed and molding pressure, and therefore, variations in handle operating force and individual differences can affect molding. becomes smaller, resulting in improved molding quality.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the invention. FIG. 2 shows an example of a plunger mechanism of a conventional manual molding machine, in which A is a side view including a partial cross section, and B is a rear view. 1... Guide cylinder, 2... Cylinder cap, 3... Plunger head, 4... Plunger guide shaft, 5... Guide shaft cap, 6
...Button, 7 ... Rotating shaft rod, 8 ... Handle, 9 ... Steel ball, 11 ... Flange, 12 ... Coil spring, 13 ... Reception plate, 14 ... Board, 15 ... Heating part, 16...Type.

Claims (1)

[Scope of utility model registration request] In the plunger drive mechanism of a manual molding machine, a spring is interposed between the manually driven rotating shaft rod and the plunger guide shaft that holds the plunger head, and the molding pressure by the plunger head is balanced by the spring. A plunger mechanism for a manual molding machine that performs molding so that changes in manual force do not directly affect molding.