JPH0424633Y2 - - Google Patents

Description

[Detailed description of the invention] {Purpose} (Field of industrial application) This invention relates to a molding fixture, more specifically a molding fixture for high voltage connectors with built-in fixed resistors for office equipment such as copying machines and facsimile machines. Regarding ingredients.

(Prior art) For example, a connector for a power cord of a copying machine, etc.
Because high voltages of tens of thousands of volts are applied, they must be manufactured to be robust. In order to protect the copying machine body and the power cord connector, it is conceivable to integrally mold a fixed resistor connected to the power supply lead wire inside the connector.

(Problem to be solved by the invention) In the high voltage connector 1, the power supply lead wire 4 is connected to the arrayed fixed resistors 2 by soldering, and the high voltage is guided into the mold for molding. When injection molding a connector, it is difficult to position and fix it, and the molten plastic is heated at high temperature (approximately 300℃) and high pressure (approximately 70℃).
Kg/1cm ² ), the fixed resistor 2 is affected by heat and pressure, and the resistance value changes or decreases due to soldering heat, molding heat, and molding pressure, which is required by safety standards. If a resistance value cannot be obtained, the connector may become unusable, or the main body of the copying machine may be adversely affected.

Furthermore, there are multiple fixed resistors 2 in the connector 1 body.
When arranging the fixed resistors in parallel, unless the fixed resistors are arranged with a certain distance between them, the heat generated from each fixed resistor tends to affect each other.

Therefore, as shown in FIG. 9, in the high voltage connector 1, the fixed resistor 2 to be soldered to the power supply lead wire 4 is coated with a heat-resistant tube 6, guided into a mold, and fused with molten synthetic resin. A method has also been proposed in which the resistor is injected and molded, but it is difficult to position and fix the resistor with a certain distance between it and the resistor to be built in. Moreover, compression due to high temperature and high pressure causes the resistor to move away from the specified position. They often moved and affected adjacent resistors and other parts, causing their resistance to deteriorate and become unusable.

(Means for Solving the Problems) This invention aims to eliminate the above-mentioned drawbacks, and its gist is that the periphery of the lower end of the sleeve-shaped body is used as a threaded part to fit into the threaded hole in the inner bottom of the lower mold. A fixture for molding a high-voltage connector with a built-in fixed resistor, which is screwable and is formed by fitting and fixing an insulated heat-resistant tube housing a fixed resistor into a fitting part formed in the head of the main body, It is molded directly into the connector.

{Structure} (Example) The fixture 10 for molding a high voltage connector with a built-in fixed resistor according to the present invention will be described with reference to an example shown in the drawings. 1 to 4, a sleeve-shaped body 12 made of hard synthetic resin has a threaded portion 14 around its lower part, and a fixed resistor fitting portion 18 is provided on the head 16 of the body.

After the fixed resistor 2 (not shown) is housed in the insulated heat-resistant tube 6, it can be fitted into the fitting part 18.

{Embodiment} In FIGS. 5 to 7, a cylindrical projection 16a is formed at the center of the upper surface of the head 16 of the sleeve-shaped main body 12. A through hole 22 into which the cylindrical projection 16a fits is formed at one end of the fixed plate 20 having a predetermined length and width, and a fixed resistor fitting part 24 is formed at the other end.
The cylindrical projection 16a is fitted into the through hole 22 of the fixing plate 20 to form the configuration shown in FIG.

{Function} In the fixture for molding a high-voltage connector with a built-in fixed resistor having the above-described configuration, the lead wire 2a of the fixed resistor 2 housed in the insulated heat-resistant tube 6 is connected to the lead wire 32 of the high-voltage cord 30. After connecting one end by soldering, the fixed resistor 2 is fitted into the fitting part 18 of the fixture, and fixed by slightly caulking inward, and the fixture is inserted into the lower mold 40 for molding. The mold 40 is guided into a cavity 42 having a desired shape, and the threaded portion 14 at its lower end 12 is threaded into the threaded hole 44 in the inner bottom of the mold 40 and fixed.

The upper mold 50 is integrated with the lower mold 40, and molten synthetic resin is injected into the gears of the molds. After the synthetic resin hardens, the mold is removed and a high voltage built-in fixed resistor is formed. Obtain connector 1.

{Effect} As mentioned above, in the cavity, the molding fixture 1
0 can be accurately positioned, and the fixed resistors 2 can be easily fixed, and each fixed resistor 2 is arranged with a certain distance between each other, and with a predetermined distance between adjacent devices. The wall thickness between each fixed resistor 2 is also constant, and is not affected by each fixed resistor at all.

In the embodiment section, if the fixing plate 20 having an appropriate length is selected according to the shape of the connector to be molded, and the protrusion 16a is fitted into the through hole 22 of the fixing plate, the mold 40 , 50, the resistor 2 can be fixed at a predetermined position within the cavity.

[Brief explanation of drawings]

Fig. 1 is a front view of the fixing device for molding a high-voltage connector with a built-in fixed resistor according to the present invention, Fig. 2 is a side view thereof, and Fig. 3 is a lead wire of the high-voltage cord. A fixed resistor with one end connected is housed in an insulated heat-resistant tube, and the fixed resistor is fitted into the fitting part of the high voltage connector molding jig shown in Figures 1 and 2. Figure 4 is a partial perspective view of the fixed resistor. Front view of the vessel, No. 5
The figure is a front view of the fixing device for connector molding in the embodiment section, FIG. 6 is a plan view of the connector molding fixture of FIG. 5, and FIG. A fixed resistor with one end connected is housed in an insulated heat-resistant tube and is fitted into the fitting part of the high-voltage connector molding jig shown in Figures 5 and 6. FIG. 9, a schematic vertical cross-sectional view of the mold, is a partially cutaway perspective view of a fixed resistor covered with a heat-resistant tube. DESCRIPTION OF SYMBOLS 10... Molding fixture, 12... Sleeve-shaped main body, 14... Threaded portion, 16... Head, 16a...
Lead wire, 18...Fixed resistor fitting part, 20...
Cylindrical projection, 22...Through holes 22, 24...Fixed resistor fitting portion.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An insulated heat-resistant product in which a fixed resistor is housed in a cylindrical fixed resistor fitting part formed on the top surface of the head of the main body, with a threaded part around the lower part of the sleeve-shaped main body. A fixing device for molding a high voltage connector with a built-in fixed resistor, which is made by fitting and fixing a sex tube. (2) The cylindrical fitting part is an elongated fixing plate, a fixed resistor fitting part is formed at one end of the fixing plate, and a through hole is bored at the other end into which the protrusion formed at the center of the top surface of the head is fitted. A fixing device for molding a high voltage connector with built-in fixed resistor according to claim 1, which is integrally formed by fitting the protrusion at the center of the upper surface of the head of the main body into the through hole.