JPH0716872A - Pin-shaped insert molding method - Google Patents

Abstract

(57) [Summary] [Purpose] The present invention relates to an insert molding method for a pin-shaped body in which a plurality of pin-shaped bodies having different lengths to the tip are planted in a resin substrate by the insert molding method.
It is intended to eliminate the problem of damaging the mold by erroneously arranging the positions of the pin-shaped bodies in the mold when arranging them in the mold. [Structure] A plurality of pin-shaped bodies 5a, 5b, 5c of the same shape in which notches 7 and 8 are formed at predetermined positions in advance are simultaneously implanted in a resin substrate 6 by an insert molding method, and after the molding, the pins are formed. Of the strips 5a, 5b, 5c, only predetermined pin strips are selectively cut and separated at the notches 7 or 8 to obtain a plurality of pin strips having different lengths.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pin-shaped insert molding method for implanting pin-shaped bodies having different lengths to the tip thereof into a resin substrate by insert molding.

[0002]

2. Description of the Related Art Conventionally, as means for detecting the remaining amount of a conductive liquid such as ink, as shown in FIG. 3, a plurality of electrode pins having different lengths to the tips are provided on the inner upper surface of the ink tank 1. A base 3 on which 2a, 2b, 2c are planted is installed, and whether or not these electrode pins 2a, 2b, 2c are in contact with the ink 4 in the grounded state is determined by each electrode pin and the ink. There is a method of detecting the remaining amount of ink by checking the presence or absence of electrical continuity between them.

Conventionally, when a plurality of pin-shaped bodies having different lengths are planted on a base by an insert molding method, they are cut into a plurality of predetermined lengths having different lengths. The electrode pins 2a, 2b and 2c were prepared, these electrode pins were respectively arranged at predetermined positions of the molding die, and then the molding resin was injected.

[0004]

However, when arranging a plurality of types of pin-shaped bodies having different lengths at predetermined positions of the mold, mass production is performed by an automatic machine. However, in the production of a small lot, it is general that the operation is performed manually by an operator in terms of equipment and productivity.

As described above, when it is manually performed, the positions of plural kinds of pin-shaped bodies having different lengths may be mistaken, resulting in damage to the mold.

The present invention is intended to provide a method in which the mold is not damaged by such a mistake of the operator.

[0007]

According to the insert molding method for a pin-shaped body of the present invention, a plurality of pin-shaped bodies having the same shape and having a notch formed in advance at a predetermined position are simultaneously formed on a resin substrate by the insert molding method. It is characterized in that after the molding is performed, only a predetermined pin-shaped body is selectively cut and separated at the cut portion after the molding.

[0008]

According to the above method, when the pin-shaped bodies are arranged in the mold, all the pin-shaped bodies have the same length, so that the pin-shaped bodies can be arranged correctly. As described above, the mold is not damaged due to the incorrect insertion.

Further, since each pin-shaped body is preliminarily formed with a notch, an excessive load is not applied to the base portion and the base is not damaged at the time of cutting after molding.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the drawings, in which three pin-shaped members 5a, 5b and 5c having different lengths are respectively connected to a base portion to form L1, L2, L3 (L1 <L2 <L3 ) Will be explained as an example of the case where the plant is planted so as to project.

First, three pin-shaped bodies 5a, 5b, 5c of the same shape having annular cuts 7, 8 formed at positions (L3-L2) and (L3-L1) from the tip are prepared, The pin-shaped bodies 5a, 5b and 5c are planted on the base 6 by insert molding so that the tips of the pin-shaped bodies 5a, 5b and 5c are L3 from the surface of the base 6, as shown in FIG.

Then, as shown in FIG.
a is the position of the notch 7, the pin-shaped body 5b is broken at the position of the notch 8 using pliers or the like, and the pin-shaped body 5a is left as it is, so that L1, L2, Three pin-shaped bodies 5a, 5 having a length of L3
b, 5c can be obtained.

The notches 7 and 8 do not easily bend or break during the work, but they can be easily cut by a jig such as pliers.

[0014]

As described above, according to the present invention, since the pin-shaped bodies arranged in the mold during insert molding have the same shape, when the pin-shaped bodies are arranged, their positions are erroneously set.
The problem of damaging the mold is gone. In addition, since the pin-shaped body has a cut formed in advance at a position where it can be broken, an excessive load is applied to the molded product during breaking,
The molded product is not damaged.

[Brief description of drawings]

FIG. 1 is a perspective view showing a molded product molded by an embodiment of a pin-shaped body insert molding method of the present invention.

FIG. 2 is a perspective view showing a molded product in an intermediate step of the same embodiment.

FIG. 3 is a side sectional view showing an example of a conventional liquid remaining amount detecting device.

[Explanation of symbols]

 5a, 5b, 5c Pin-shaped body 6 Base part 7, 8 Notch

Claims (1)

[Claims] 1. A plurality of pin-shaped bodies of the same shape, each having a notch formed in advance at a predetermined position, are simultaneously implanted in a resin substrate by an insert molding method, and after the molding, only a predetermined pin-shaped body is selected. A method for insert-molding a pin-shaped body, which is characterized by cutting and separating at the cut portion.