JPH0347851Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a transfer molding device.

[Conventional technology and problems]

There is a need for a portable, small, lightweight, and inexpensive transfer molding device suitable for molding optical fiber connectors and the like.

Aiming at such a portable type, we proposed a transfer molding device that is a smaller version of the conventionally used transfer molding device. (Special request 1986
−106433. "Transfer molding device") The outline of this device is as follows. That is, FIG. 2A is a partially sectional front view of the device, and FIG. 2B is a sectional view taken along line A--A in FIG.

In the drawings, numerals 1 and 2 indicate upper and lower heating plates each having a heater therein, and the upper heating plate 1 is provided with a resin pot 3 that fits into the head of a plunger 6.
4 is a mold equipped with a spool 5. Clamping of this mold 4 is performed by sandwiching it between the upper and lower heating plates 1 and 2, and the clamping force is determined by compression provided on both sides of the lower part of the lower heating plate 2. This is caused by a spring 9, and by moving the heating plate 2 up and down, the clamp of the mold 4 can be opened and closed. As shown in Figure A, the structure is as follows: By tilting the eccentric cam type lever levers 11 90 degrees, which are located on the axis of the compression springs 9 on both sides of the lower part of the lower heating plate 2, By compressing the compression spring 9 provided at the bottom, it is possible to attach and detach the mold 4. At this time, by designing the tangent of the cam to be horizontal, the position can be adjusted without the generation of component force. It is now possible to maintain it naturally. When the eccentric cam type lever 11 is made vertical, the opposite operation to that described above occurs, and the compression spring 9 causes the lower hot platen 2 to rise and clamp the mold 4 between it and the upper hot platen 1.

Further, the lower heating plate 2 is provided with a grooved guide portion 8, which allows the spool 5 of the mold 4 and the upper heating plate 1 to be connected.
The resin pot 3 can be stably positioned, and dirt can also be naturally removed by the groove.
In particular, by providing a hole deep in the groove, garbage will naturally fall through the hole.

Furthermore, a hole for a thermocouple is provided at the back of the mold, and by inserting the mold 4 along the grooved guide part 8, it can be attached to this hole between the upper and lower heating plates 1 and 2. The temperature detection terminal 13 is inserted, and the mold temperature can be automatically detected.

The plunger 6 is loaded with tension by tension springs 7 installed on both sides of the upper and lower heating plates 1 and 2, and a cam attached to the shaft of an electric motor 10 installed at the bottom of the lower heating plate 2. 12 rotates,
During molding, the cam 12 rotates in the opposite direction, and the plunger 6 pressurizes the resin in the pot 3 according to the accumulated tension by lowering the guide shaft 14 in contact with the cam 12. From mold 4
Inject resin inside. Note that the cam surface of the cam 12 before molding is positioned substantially horizontally and is configured not to receive partial pressure.

Normally, when putting in and taking out the mold 4, the stroke of the vertical movement of the lower heating plate 2 due to the tilt of the eccentric cam type lever 11 described above is a small stroke that does not cause any trouble, but in the unlikely event that the mold The stroke may be modified so that the mold can be easily removed. Specifically, the long hole 1 of the shaft 15
The position of the pin 17 (axis center of the lever 11) inserted into the lever 6 is pushed down by rotating the adjusting screw 18, and the mold stand 19 is lowered against the compression force of the compression spring 9, thereby lowering the heat. The configuration may be such that the stroke of the board 2 is adjusted.

In order to more evenly transmit the clamping force to the entire surface of the mold 4, a spring 20 or a pivot (not shown) may be interposed between the lower heating platen 2 and the mold stand 19.

As is clear from the above explanation, in this device, the heating elements of the upper heating plate, lower heating plate, and mold are in a situation where heat is freely radiated from the outside, and heat is conducted downward by springs and other metal objects. There is also heat radiation, and the temperature distribution and heating efficiency of the mold are never good.

The quality of molding is greatly influenced by the temperature uniformity of the mold, but under the heat dissipation conditions described above, a larger heating power supply capacity is required.

[Purpose of invention. composition〕

In order to reduce the weight, which is one of the original purposes of a simple transfer molding device, the present invention eliminates the use of a motor for injecting resin into the mold as described above, and uses manual labor to inject the resin into the mold. , the upper and lower heating plates, etc. are housed and supported within a cylindrical frame, and are constructed with the aim of suppressing heat radiation from the upper and lower heating plates and the mold, particularly by using the cylindrical frame and heat insulating material. The inner upper part of the cylindrical frame is provided with an upper heating plate having resin pots, the inner lower part of the frame is provided with a lower heating plate and the lower guide plate, and the mold is placed on the lower heating plate. In a transfer molding device that performs resin molding by injecting resin from a resin pot of the upper heating plate into the mold with the mold raised together with a guide plate and pressed by an upper heating plate and a lower heating plate. , the upper heating plate is fixed to the cylindrical frame via a heat insulating material to the ceiling of the frame without bringing the outer periphery of the upper heating plate into contact with the inner wall surface of the frame, and the lower heating plate is fixed to the ceiling of the frame via a spring. It is characterized in that it is held on a guide plate.

The present invention will be explained below with reference to an embodiment shown in FIG.

In the figure, 21 is a cylindrical metal frame.
The inner wall of the cylindrical metal frame 21 may be plated with nickel or chrome, or made of stainless steel to provide a heat-reflecting surface.The mold insertion portion may be provided with a door, excluding openings for wiring, etc., after assembly. It is designed to be kept in a sealed state. 22 is a cylindrical metal frame 2
A guide cylinder connected and fixed to the upper part of 1, 2
2' is a cap of the guide cylinder, 23 is a rotating shaft rod, and 24 is a flange protruding from one end of the rotating shaft rod 23.

Further, 25 is a plunger, 25' is a plunger head, 26 is a plunger guide shaft integrally connected to the plunger 25 by a screw, and 27 is a guide shaft cap, which connects the plunger guide shaft 26.
It is connected with screws.

The surface of the rotary shaft rod 23 is threaded, and is screwed into the threaded hole provided in the center of the cap 22' of the guide cylinder 22, and a drive handle 28 is attached to one end of the rotary shaft rod 23 in a detachable manner, for example. By rotating, the flange 24 can be moved up and down.

On the other hand, the plunger guide shaft 26, which is integrated with the plunger 25 by a screw, has an engaging portion formed on its outer circumferential surface, such as a key, which is connected to the guide cylinder 22.
It may be configured such that it engages with an axial groove provided on the inner circumferential surface of the rotary shaft rod 23 and is guided by sliding without rotating vertically by the driving force from the rotary shaft rod 23. , instead of the engagement between the key and the groove, the plunger 25 holds the steel ball 29 at the center of the axis of the rotating shaft rod 23 on the side facing the flange 24, and its low frictional resistance allows the plunger 25 to hold the steel ball 29 at the center of the shaft of the rotating shaft rod 23. It may be configured such that only the driving force in the vertical direction is transmitted to the plunger 25 without transmitting the rotational force thereof. The point is that the plunger 25 may be configured to slide without being rotated in the vertical direction by the driving force from the rotating shaft rod 23.
Note that the steel ball 29 may be configured to hold its position by a groove formed in the flange 29 and the plunger 25.

30 is an upper heating plate having a resin pot 31 at its center. The upper heating plate 30 has a hole 42 for installing a heater wire therein, and although not shown, the heater wire is embedded therein. Reference numeral 40 denotes a heat insulating material stretched over the upper surface of the upper heating plate 30 except for the pots, and the cylindrical metal frame 2
The upper heating plate 3 is placed on the ceiling side of 1 through this heat insulating material 40.
0 is fixed. The outer periphery of the upper heating plate 30 does not come into direct contact with the inner wall surface of the cylindrical metal frame 21, except for a small part such as the part fixed to the ceiling and the wiring from the outside for the heater wire. Designed.

32 is a lower heating plate, which, like the upper heating plate 30, has a hole 42' for installing a heater wire, in which a heater wire (not shown) is embedded, and on its upper surface, a hole 42' for holding the mold 33 in a fixed position is provided. It has a recess. 34 is spring 3
5 is a guide plate disposed below the lower heating plate 32, 36 is a guide shaft of the guide plate 34, and 37 is a guide plate symmetrically attached to the lower part of the guide plate integral with the guide plate 34. It's a pin.

38 is the lower part of the cylindrical metal frame 21,
Two eccentric cam type lever levers are centrally symmetrically supported on the frame 21 so as to be rotatable by a shaft 39, the ends thereof have a cam surface, and are located below the guide plate 34, It is bent at a substantially right angle beyond the attachment position by the shaft 39 and extends upward along the cylindrical metal frame 21 . Note that the guide plate 34 has an engaging portion formed on the inner wall surface that protrudes and engages with a guide groove, for example, so that the guide plate 34 can be moved up and down in a straight line along the inner wall surface of the cylindrical metal frame 21. We are prepared. Preferably, the lower heating plate 32 does not come into direct contact with the inner wall surface of the cylindrical metal frame 21 in order to make the clamping force of the mold 30 uniform. Reference numeral 43 denotes a dust fall prevention plate provided to prevent dust from falling from between the lower heating plate 32 and the frame 21.

Although not shown, the mold 33 is inserted into the lower heating plate 3 from an insertion part with a door provided on the front side of the cylindrical metal frame 21.
It can be positioned and placed by the recess 32' on 2. The mold 33 has a resin injecting spool centered on the upper resin pot 31 at the center of its upper surface.

〔motion〕

While the device is in operation, the mold 33 is placed in a predetermined position on the lower heating plate 32, and the two eccentric cam type lever levers 3
8 is tilted to the left or right in the figure, the lower surface of the guide plate 34 is lifted, and the upper heating plate 30 and lower heating plate 32 clamp the mold 33 in the shape of a sanderch. At this time, some of the cam surfaces 41 are just above the shaft 39,
The interposition of the spring 35 located horizontally and symmetrically thereto makes the clamping force stable and reliable in this position. When the mold 33 is clamped, the molding resin is inserted into the pot 31, and the molding conditions are set, the control system (not shown) displays (instructs) to start molding, and the drive handle 28
is manually rotated, and the rotating shaft rod 23 is screwed to lower the plunger head 25'. At this time, the flange 24 at the tip of the rotating shaft rod 23 lowers the plunger 25, but the plunger guide shaft 26, which is integrated with the plunger 25, slides without rotating due to engagement with the guide cylinder 22. and lowers to guide the plunger head 25' in a sliding manner into the opposite pot 31. The plunger head 25' is further lowered and the manual rotation of the drive handle 28 is stopped while the resin in the pot 31 is delivered to the mold 33.

After molding in the mold 33 is completed, when the drive handle 28 is reversely rotated in accordance with the completion display (instruction) of the control system (not shown), the plunger guide shaft 26 is attached to the flange 24 as the rotating shaft rod 23 rises.
The guide shaft cap 27 engages and pulls the plunger 25 upward.

After the extrusion system is restored in this way, when the eccentric cam type lever 38 is pulled up, the lower side of the end of the lever 38, which is rotated by the shaft 39, engages with the pin 37 on the lower side. Then, the guide plate 34 integrated with the pin 37 is lowered, and the lower heating plate 32 on the upper side is lowered via the spring 35.
is lowered and returned together with the guide plate 34, and the mold 33 can be taken out.

[Effect. effect〕

As explained above, this device operates, but the cylindrical metal frame 21 is connected to the insertion part of the mold 33 (during work, the door provided is closed to cut off outside air) and the upper and lower heat. It is a cylindrical heat insulating body that forms a wall surface all around the top and bottom except for the minimum openings necessary for wiring and adjustment for the panels 30 and 32, and the upper heating panel 30, the lower heating panel 32, and the metal inside. Type 33 also has a guide section,
There is no contact with the wall surface except for the spring 35, and there is no insulation material,
Since it is mounted in isolation by an air barrier layer, the cylindrical metal frame 21 exhibits a very effective heat retention effect. As a result, uniform heating of the mold 33 is effectively performed, heating efficiency is improved, and power supply capacity can be reduced.

Since the cylindrical metal frame according to the present invention only needs to be formed into a cylindrical shape, the inner surface may have the same cylindrical shape, and the entire frame can be machined by turning, so it has good workability.

The cylindrical metal frame itself is used to fix or support the heat insulating wall and each part to the interior, thereby reducing the overall weight.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the invention partially in section. Fig. 2 shows a previously proposed small-sized transfer, Fig. A is a partially sectional front view of the device, and Fig. B is a sectional view taken along the line A-A in Fig. 21...Tubular metal frame, 22...Guide cylinder, 22'...Guide cylinder cap, 2
3... Rotating shaft rod, 24... Flange, 25... Plunger, 25'... Plunger head, 2
6... Plunger guide shaft, 27... Guide shaft cap, 28... Drive handle, 29... Steel ball, 30... Top heating plate, 31... Resin pot, 3
2...Lower heating plate, 33...Metal fittings, 34...Guide plate, 35...Spring, 36...Guide shaft, 37...
Pin, 38... Eccentric cam lever lever, 39...
Shaft on cylindrical metal frame, 40...Insulating material, 41
...Some cam surfaces.

Claims (1)

[Scope of utility model registration request] The inner upper part of the cylindrical frame is provided with an upper heating plate having resin pots, the inner lower part of the frame is provided with a lower heating plate and the lower guide plate, and a mold is placed on the lower heating plate and the guide plate is provided. In a transfer molding device that performs resin molding by injecting resin from a resin pot of the upper heating plate into the mold with the mold raised together with the plate and pressed by an upper heating plate and a lower heating plate. , the upper heating plate is fixed to the cylindrical frame via a heat insulating material to the ceiling of the frame without bringing the outer periphery of the upper heating plate into contact with the inner wall surface of the frame, and the lower heating plate is fixed to the ceiling of the frame via a spring. A transfer molding device characterized by being held on a guide plate.