JPH0347852Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a drive mechanism for a small-sized transfer molding device that can perform manual resin molding.

[Conventional technology and problems]

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

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, reference 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. This mold 4 is clamped by being sandwiched 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 further rotates, 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, and releases it from the spool 5. 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 elongated hole 1 of the shaft 15
The position of the pin 17 (axis center of the lever 11) inserted through the lever 6 is pushed down by rotating the adjustment 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.

Comparing this with a conventional molding device that uses hydraulic pressure, the overall size and weight can be significantly reduced by using a small motor. The drive mechanism for injecting the resin in the pot 3 into the mold still occupies a large amount of weight of the entire device.

As a countermeasure to this problem, a plunger drive mechanism using a lever as shown in FIG. 3 is the easiest to consider.

In the figure, 1' is the lever lever, 2' is the fulcrum of the lever, 4' is the main body of the device, and 3' is the lever lever 1'.
The plunger is engaged in the middle of the arm.

In the case where the plunger 3' is driven by the lever lever 1', the arm of the lever 1' becomes longer in the lateral direction, protrudes from the main body of the device, and the balance becomes worse. If the lever levers 1' are provided in a symmetrical cross-over manner in order to maintain balance, the levers will become even larger and the handleability will deteriorate. Further, although it is easy to apply a large force in the downward direction, it is difficult to apply a large force in the upward (pulling out) direction.

[Purpose of invention. composition〕

In accordance with the objective of downsizing and weight reduction, the present invention attempts to approach the above-mentioned objectives of downsizing and weight reduction by using a manual drive mechanism as the drive mechanism for injecting the resin into the mold using a plunger. The purpose is to provide a manual drive mechanism that is easy to handle and allows the plunger that extrudes resin to be lowered and raised easily during resin molding work. , an upper heating plate having resin pots is provided, a lower heating plate is provided at the inner lower part of the frame, and a guide plate is provided below the heating plate, a mold is placed on the lower heating plate and raised together with the guide plate, and the mold is placed on the lower heating plate and raised together with the guide plate; A transfer molding device that performs resin molding by injecting resin from a resin pot of the upper heating plate into the mold with a plunger while the mold is held down by an upper heating plate and a lower heating plate, A rotating shaft rod with a handle attached thereto is screwed into a guide cylinder fixed to the upper part of the cylindrical frame, and the tip of the rotating shaft rod is opposed to the head of a plunger that can move in the axial direction within the guide cylinder, and the plunger The head of the resin pot faces the resin pot.

The present invention will be explained below with reference to the 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 connected to the upper part of the cylindrical metal frame 21. The guide cylinder is fixed, 22' 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, 27 is a guide shaft cap, and the plunger guide shaft 26 is connected to 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, and a motor wire (not shown) is embedded therein; It has a recess. 34 is spring 3
5 is a guide plate placed under the lower heating plate 32 with 36 in between, and 36 is a guide shaft of the guide plate 34.
Further, 37 is a pin symmetrically attached to the lower part of the guide plate which is integral with the guide plate 34.

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 . The guide plate 34 is provided with 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. ing. The lower heating plate 32 is the mold 3
In order to make the zero clamping force uniform, it is preferable to avoid direct contact with the inner wall surface of the cylindrical metal frame 21. 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 the mold 33 is not shown, the door provided on the front of the cylindrical metal frame 21 is located below the heating plate 3 from the insertion part.
The 32' recess on 2 allows for positioning and placement. 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 25. At this time, the rotating shaft rod 2
The flange 24 at the tip of the plunger 25 lowers the plunger 25, but the plunger guide shaft 26, which is integrated with the plunger head 25', slides and lowers without rotating due to engagement with the guide cylinder 22. The plunger head 25' is guided 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, in the plunger drive mechanism for resin molding of the present invention, force is transmitted and driven by an extremely simple mechanism.

Since the driving force and driving speed are directly controlled manually, the controllability is unavoidably inferior to those using oil pressure, motors, etc. due to the use of other external energy, but since it is a rotary operation, the operation control is relatively constant. And it's easy. For example, the rotation operation can be easily performed in accordance with an appropriate molding start control signal such as a lamp or electronic sound from the control system.

The driving speed and driving force of the plunger can be appropriately selected by changing the pitch of the thread, and the thread efficiency can be adjusted by selecting the thread shape (for example, triangular thread, trapezoidal thread, square thread), along with workability and economic efficiency. The range of applications is wide because it only needs to be selected appropriately.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the invention partially in section. Figure 2 shows the previously proposed small transfer molding device, and Figure A is a front view of the device partially shown in section.
Figure B is a sectional view taken along line A-A in Figure A. FIG. 3 is an explanatory diagram of a plunger drive mechanism using a lever lever. 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...Pot for resin, 3
2...Lower heating plate, 33...Metal fittings, 34...Guide plate, 35...Spring, 36...Guide shaft, 37...
Pin, 38...Eccentric cam type 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 placed on the lower heating plate. A transfer that is raised together with the plate and presses the mold between an upper heating plate and a lower heating plate, and injects resin from the resin pot of the upper heating plate into the mold using a plunger to perform resin molding. In the molding device, a rotating shaft rod with a handle attached is screwed into a guide cylinder fixed to the upper part of a cylindrical frame, and a plunger that can move in the axial direction within the guide cylinder is opposed to the tip of the rotating shaft rod, A drive mechanism for a small transfer molding device in which the head of the plunger faces the resin pot.