JPH0547962B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a chip type variable resistor whose resistance value can be adjusted.

[Conventional technology]

In general, this type of chip type variable resistor is described in, for example, Japanese Utility Model Application Publication No. 58-44305, and
As shown in FIGS. 1 to 3, a resistive film 3 is formed in an arc shape centered on the through hole 2 on the upper surface of a substrate 1 having a through hole 2 in the center, while A hollow shaft 5 that fits into the through hole 2 is integrally formed on the center terminal plate 4 disposed on the lower surface of the terminal plate 1,
Furthermore, after a rotor member 6 equipped with a swing terminal 6a that is in sliding contact with the resistive film 3 is rotatably fitted onto the upper end of the hollow shaft 5, the upper end of the hollow shaft 5 is caulked (this caulking portion is , indicated by reference numeral 7), the rotor member 6 is rotatably mounted. Note that numerals 8 and 9 indicate terminals for both ends of the resistive film 3.

Conventionally, this chip type variable resistor has been manufactured using the following method.

That is, as shown in FIGS. 8, 9, and 10, a plurality of central terminal plates 4 with hollow shafts 5 are integrally formed so as to protrude from one longitudinal side at appropriate intervals. Two belt-shaped frames are used, a first belt-shaped frame a and a second belt-shaped frame b integrally formed with the rotor member 6 at appropriate intervals, and the first belt-shaped frame a is During the transfer, first, the resistive film 3 is placed on the upper surface of each center terminal plate 4 at the position ().
The board 1 with terminals 8 and 9 formed thereon is assembled so as to fit over the hollow shaft 5 of the center terminal plate 4, and then, at the () position, the rotor member 6 of the second strip-shaped frame b is assembled. When the second strip-shaped frame b and the first strip-shaped frame a are adsorbed by a vacuum suction type collet c that reciprocates between the second strip-shaped frame b and the first strip-shaped frame a, the second strip-shaped frame b is cut.
By moving the collet c above the first belt-shaped frame a, the rotor member 6 is assembled onto the upper surface of the substrate 1 so as to fit onto the hollow shaft 5, and at position (), hollow shaft 5
After the tip of the hollow shaft 5 is caulked by pushing a punch d formed into a conical tip into the tip of the center terminal plate 4, each center terminal plate 4 is cut away from the first strip-shaped frame a. .

[Problem to be solved by the invention]

However, in this conventional manufacturing method, the rotor member 6 in the second strip frame b is
When cutting the rotor member 6 from the second belt-shaped frame b while it is being sucked by the collet c, and when releasing the rotor member 6 from being sucked by the collet c, the rotor member 6 is
rotates around the hollow shaft 5, and the rotor member 6
In addition to the fact that the phase direction of the sliding terminal 6a is shifted, when the hollow shaft 5 on which the rotor member 6 is fitted is caulked by pushing the punch d, the rotor member 6 is not rotated around the hollow shaft 5. As the rotor member 6 rotates, the phase direction of the sliding terminal 6a in the rotor member 6 is shifted.

As a result, as shown in FIG. 11, the rotor member 6 is assembled with its phase direction shifted relative to the substrate 1, and the initial resistance values of each chip type variable resistor vary. Therefore, after the caulking process of the hollow shaft 5, a correction process must be added to align the rotor member 6 in a certain phase direction, which raises the problem that the manufacturing cost increases considerably. Ta.

The present invention aims to provide a method that solves this problem.

[Means to solve the problem]

To achieve this object, the present invention provides a first strip-shaped frame in which a plurality of center terminal plates with hollow shafts in a chip type variable resistor are integrally formed to protrude from one longitudinal side at appropriate intervals. , and a second strip-shaped frame integrally formed with the rotor members of the chip-type variable resistor at appropriate intervals, and while the first strip-shaped frame is transferred in its longitudinal direction, each center terminal plate is moved. The substrate of the chip-type variable resistor is assembled so as to be fitted onto the hollow shaft, and then the rotor member of the second band-shaped frame is fitted onto the hollow shaft with respect to each substrate. In the method for manufacturing a chip-type variable resistor, the upper end of each hollow shaft is caulked, and each center terminal plate is separated from the first strip-shaped frame. Between at least two rotor members of each rotor member in the frame,
At least two rotor members connected by a tie bar are connected at a portion opposite to the first belt-like frame, and are cut from the second belt-like frame while being connected by the tie bar. Assemble to each board,
After caulking each hollow shaft, the tie bar was cut from each rotor member.

[Effect]

As described above, the present invention provides for cutting from the second strip frame, releasing the collection from adsorption, and removing the collection from the second strip frame while keeping at least two rotor members of each rotor member in the second strip frame connected by the tie bar. , caulking is performed at the tip of each hollow shaft, and when cutting from the second strip frame, releasing suction, and caulking the hollow shaft, each rotor member is attached to the tie bar with respect to each other. Since the rotor members are connected together so that they do not rotate around the hollow shaft, it is possible to ensure that the phase directions of each rotor member are accurately aligned in a fixed direction.

In this way, when connecting each rotor member with a tie bar, if this tie bar is located on the first strip frame side, when cutting this tie bar after caulking the hollow shaft, the lower part of the tie bar will be removed. Since the first strip frame located on the side becomes an obstacle, the work efficiency of cutting the tie bar from the rotor member is significantly reduced.

In contrast, in the present invention, the tie bars that connect the rotor members to each other are disposed on the opposite side of the first strip frame, so that when the tie bars are cut from each rotor member, Since the first belt-shaped frame does not get in the way, it is possible to avoid a decrease in the workability of cutting the first belt-shaped frame.

〔Effect of the invention〕

Therefore, according to the present invention, when manufacturing chip-type variable resistors, the process for aligning the phase directions of the rotor members in each chip-type variable resistor to a constant level is not necessary, resulting in a decrease in work efficiency in other processes. Since it can be omitted, the manufacturing process is simplified, the manufacturing speed can be improved, and manufacturing costs can be significantly reduced.

〔Example〕

Hereinafter, embodiments of the present invention will be explained with reference to FIGS. 5 to 7. In the drawings, reference numeral A indicates the center terminal plate 4 with the hollow shaft 5 in the chip type variable resistor shown in FIGS. 1 to 3. , indicating a first strip-shaped frame integrally formed so as to protrude from one side in the longitudinal direction at an appropriate interval P, while the first strip-shaped frame A is being transported along the longitudinal direction. At the () position, each center terminal plate 4
In contrast, the substrate 1 with the resistive film 3 of the chip type variable resistor shown in FIGS. 1 to 3 is assembled so as to be fitted onto the hollow shaft 5. In this case, the substrate 1 and the center terminal plate 4 will not be misaligned because the center terminal plate 4 fits into the recess on the lower surface of the substrate 1.

Reference numeral B designates a second strip-shaped frame for forming the rotor member 6 with the sliding terminal 6a in the chip type variable resistor shown in FIGS. 1 to 3, and this second strip-shaped frame B includes: The rotor member 6 with the sliding terminal 6a is formed in two rows along the longitudinal direction, and the interval S between the two rows is set to the first
In addition, two rotor members 6 arranged in a direction perpendicular to the longitudinal direction of the second strip frame B, which are equal to the interval P between the center terminal plates 4 in the strip frame A, are attached to the first strip frame A. and a portion on the opposite side are connected to each other by a tie bar B1.

Then, at a position ( ) along the longitudinal direction of the first strip frame A, the rotor member 6 in the second strip frame B is moved back and forth between the second strip frame B and the first strip frame A. While being adsorbed by the moving vacuum adsorption type collet C,
When cutting from the second strip frame B, the collet C moves above the first strip frame A, so that the rotor member 6 is fitted onto the hollow shaft 5 on the upper surface of the substrate 1. Assemble.

In this case, the second strip frame B
Without cutting each of the rotor members 6 one by one, the two rotor members 6 connected to the tie bar B1 are cut from the second strip frame B while being connected by the tie bar B1. Each of the base bodies 1 previously assembled to the two center terminal plates 4 in the first strip-shaped frame A is assembled so as to fit onto the hollow shaft 5, and in this way, the two rotor members 6 By cutting the two rotor members 6 from the second belt-shaped frame B while they are still connected by the tie bar B1, it is possible to prevent the two rotor members 6 from rotating around the hollow shaft 5 during this cutting, and also to prevent the collet C from rotating around the hollow shaft 5. When releasing the suction caused by this, it is possible to prevent the two rotor members 6 from rotating around the hollow shaft 5.

Next, at a position ( ) along the longitudinal direction of the first band-shaped frame A, a punch D formed in a conical shape is pushed into the tip of the hollow shaft 5 in each center terminal plate 4 , thereby punching the hollow shaft 5 . Caulk the tip. Even during this caulking, the two rotor members 6 do not rotate around the hollow shaft 5 because they are connected to each other by the tie bar B1.

After the tie bar B1 is cut at the () position after caulking at the () position, the product chip type variable resistor is cut away from the first band-shaped frame A.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of a chip type variable resistor, Fig. 2 is a plan view of Fig. 1, and Fig. 3 is a - of Fig. 1.
4 is an exploded view of a chip type variable resistor, FIGS. 5 to 7 show embodiments of the present invention, FIG. 5 is a plan view, and FIG. 6 is a perspective view of FIG. 5. The cross-sectional view, FIG. 7 is a cross-sectional view of FIG. 5, and FIG.
Fig. 10 shows the conventional method, Fig. 8 is a plan view,
9 is a cross-sectional view taken from the side of FIG. 8, FIG. 10 is a cross-sectional view taken from the side of FIG. 8, and FIG. 11 is a plan view of a chip type variable resistor manufactured by a conventional method. 1...Substrate, 2...Through hole, 3...Resistive film, 4
...Center terminal plate, 5...Hollow shaft, 6...Rotor member, 6a...Sliding terminal, A...First strip-shaped frame, B...Second strip-shaped frame, B1...Tie bar, C... ...Collection, D...Ponchi.

Claims (1)

[Claims] 1. A first belt-shaped frame in which a plurality of center terminal plates with hollow shafts in a chip-type variable resistor are integrally formed so as to protrude from one side in the longitudinal direction at appropriate intervals, and a rotor in the chip-type variable resistor. A second band-shaped frame integrally formed with members at appropriate intervals is used, and while the first band-shaped frame is transferred in its longitudinal direction, the chip-type variable resistor is attached to the center terminal plate. The substrates are assembled so as to fit on the hollow shafts, and then the rotor members of the second band-shaped frame are assembled to each substrate so as to fit on the hollow shafts, and then In the method for manufacturing a chip type variable resistor, the upper end is caulked, and each center terminal plate is separated from a first strip-shaped frame, wherein at least two of each rotor member in the second strip-shaped frame are separated from each other. The rotor members are connected by a tie bar at a portion opposite to the first band-shaped frame, and the at least two rotor members connected by the tie bar are connected to each other by the tie bar while the second band-shaped frame is connected. A method for manufacturing a chip-type variable resistor, characterized in that the tie bar is cut from each rotor member, assembled to each substrate, and after each hollow shaft is caulked, the tie bar is cut from each rotor member.