JPH0217700A - Shaft type automatic adjusting head - Google Patents

Abstract

PURPOSE:To eliminate the need for the replacement of heads by an insertion port and positioning with high accuracy by adjusting the discrete state of the insertion-side end section of a head element by the quantity of lowering of a cylindrical member and forming the head element of a flexible material. CONSTITUTION:The insertion-side end sections 4 of head elements 2 are inserted into the inserting hole of a trimmer part under the state in which the insertion- side end sections 4 are collected, a cylindrical member 7 is moved in the direction of a head 1, and the insertion-side end sections 4 are scattered, thus abutting the insertion-side end sections 4 against the inwall surface of the inserting hole of the trimmer part, then adjusting the revolution of the trimmer part under the state. Since the discrete state of the end sections 4 is changed by varying the movement of the cylindrical member 7 at that time, the head may not be exchanged to various inserting holes. Since the head elements 2 are formed of a flexible material, the elements 2 are deformed elastically and the inserting hole is not damaged even when the insertion-side end sections 4 are not inserted at normal positions, and the insertion-side end sections 4 are located at the normal positions when the head is turned, thus regulating the revolution of the trimmer part.

Description

[Detailed Description of the Invention] Summary This invention relates to a shaft-type automatic adjustment head used to adjust the rotation of a trimmer component mounted on a printed wiring board, eliminating the need to replace the head depending on the size of the insertion hole of the trimmer component. , aims to provide a shaft-type automatic adjustment head that does not require highly accurate positioning and adjustment of the rotational direction to insert the head into the insertion hole, and the head of the tool is inserted into the trimmer component on the printed wiring board and rotated. In the axial type automatic adjustment head for adjustment, the head is composed of a plurality of head elements, each of the plurality of head elements is swingably supported inside a support ring, and the head element is connected to the trimmer part. providing a biasing member that biases the head element in a direction in which the insertion side ends gather together, and bringing a rear end of the head element opposite to the insertion side end into contact with a tapered wall surface of the cylindrical member; By moving the cylindrical member up and down with respect to the head, the insertion side ends of the head elements are assembled and separated.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft-type automatic adjustment head used for rotationally adjusting a trimmer component mounted on a printed wiring board.

In the field of electronic device manufacturing, electronic circuits are constructed by mounting electronic components such as integrated circuits, resistors, and capacitors on printed wiring boards on which wiring patterns are formed, and then soldering the electronic components and wiring patterns. That's what I do. In order to eliminate variations in circuit characteristics due to variations in component constants, the circuit is equipped with a trimmer component that changes the constants, and this trimmer component is rotated and adjusted during the testing stage to obtain constant circuit characteristics. ing.

If the above adjustment is easy due to the circuit configuration,
This can be easily handled by manual work, but in cases where the circuit configuration requires complex adjustment of multiple interconnected parts, manual work requires many man-hours and requires accurate judgment by experts. Therefore, automation of adjustment is desired.

Conventional technology Trimmer components are usually mounted on a printed wiring board in the same way as other electronic components, and by inserting a driver-like head into the insertion hole of the trimmer component and rotating it, components such as resistance values can be determined. Constants are made variable. The head is supported by a tool of an automatic adjustment device, and by moving the tool, adjustments can be made to desired trimmer parts. A specific example of the prior art will be described below with reference to FIG. This example corresponds to the content of "Insertion state detection mechanism for shaft type automatic adjustment head" filed by the applicant on April 5, 1988. In the figure, 41 is a tool, 42 is its head, 43 is a trimmer component mounted on a printed wiring board 44, and 45 is a distance sensor that detects the distance between the tool 41 and the trimmer component 43.

The head 42 is supported so as to be able to make a predetermined displacement in the opposite direction to the final approach movement of the tool 41 toward the trimmer part 43, and the amount of displacement is detected by a displacement sensor 464, and the detected value and the distance sensor 464 detect the amount of displacement. The insertion state of the head 42 is detected from the detected value of 45.

Problems to be Solved by the Invention When implementing the above conventional detection mechanism, the following problems arise.

First of all, it is necessary to replace the head depending on the size or shape of the insertion hole of the trimmer component, resulting in lack of versatility.

Therefore, a first object of the present invention is to provide a shaft-type automatic adjustment head that does not require replacing the head depending on the size and shape of the insertion hole.

Second, since the tip of the head is driver-shaped, the head can only be inserted into the insertion hole at a specific position with respect to the direction of rotation of the head, and in practice, it is difficult to insert the head into the insertion hole. requires extremely high-precision alignment and adjustment of the rotational direction.

For example, if the head is rotated without sufficient adjustment of the rotational direction, there is a risk of destroying the insertion hole made of plastic material or the like.

Therefore, a second object of the present invention is to provide a shaft-type automatic adjustment head that does not require highly accurate positioning and rotational direction adjustment for inserting the head into an insertion hole.

Means to solve problems FIG. 1 is a diagram showing the principle of the present invention.

In this shaft-type automatic adjustment head, the head 1 of the tool is inserted into a trimmer component on a printed wiring board for rotational adjustment.

The head 1 is composed of a plurality of head elements 2.

The head elements 2 are each swingably supported inside a support ring 3.

Reference numeral 5 denotes a biasing member that biases the head element 2 in the direction in which the ends 4 of the head element 2 on the insertion side into the trimmer component come together.

A rear end 6 of the head element 2 on the side opposite to the insertion side end 4 is in contact with a tapered wall surface 8 of the cylindrical member 7 .

By moving the cylindrical member 7 up and down with respect to the head 1, the insertion side ends 4 of the head elements 2 are brought together and separated.

In addition, FIG. 1(a) is a partial cross-sectional side view when the insertion side ends 4 are assembled, and FIG. 1(b) is a view taken in the direction of arrow (b) in FIG. 1(a). (C) is a partial cross-sectional side view when the insertion side end portions 4 are separated, and (d) is a side view of the same figure (
The (d) direction arrow view in C) is shown, respectively.

Function According to the configuration of the present invention, the insertion side ends 4 of the head elements 2 are inserted into the insertion hole of the trimmer component in the assembled state, and the cylindrical member 7 is moved in the direction of the head 1. By moving and separating the insertion side end 4, the insertion side end 4
Since it comes into contact with the inner wall surface of the insertion hole of the trimmer component, the rotation of the trimmer component can be adjusted in this state. In this case, by adjusting the amount of movement of the cylindrical member 7 with respect to the head 1, the discrete state of the insertion side end 4 of the head element 2 can be changed, so that it can be adjusted to various sizes or shapes of the insertion hole. The insertion hole eliminates the need to replace the head.

This achieves the first objective.

Furthermore, by forming the head element 2 from a flexible material, even if the head is inserted into the insertion hole at a position other than the specific position where the head can be inserted, which is determined according to the shape of the insertion hole. However, since the head element is elastically deformed in this state, the insertion hole is less likely to be damaged. In this case, by rotating the head, the head element is elastically restored and inserted into the specific position, so that the trimmer component can be rotated and adjusted thereafter.

Example Embodiments of the present invention will be described below based on the drawings.

FIG. 2 is an embodiment of the present invention, showing a state (a) in which the insertion side ends of the heads are gathered together and a state (b) in which they are separated.
), and FIG. 3 is a top view (a), a front view (b), and a bottom view (
C) and FIG. 4 are a top view (a), a vertical sectional view (b), and a bottom view (C) of the cylindrical member 13 shown in FIG.

II is the main body housing of the tool; 12 is an external motor that rotates the main body housing 11;
A cylindrical member 13 is provided inside the cylindrical member 1 . 14.
15 is a stopper for preventing rotation of the cylindrical member 13 relative to the main body housing 11, and 16 is an internal motor fixed inside the main body housing 11. A shaft 17 of the internal motor 16 is threaded, and the shaft 17 is threaded into a threaded hole 13a formed along the central axis of the cylindrical member 13. Therefore, by driving the internal motor 16, the cylindrical member 13 can be moved up and down with respect to the main body housing 11. A tapered wall surface 18 is formed inside the cylindrical member 13, and the rear end portion of the head 19 is in contact with this tapered wall surface 18.

The head 19 includes a plurality of (four in this embodiment) head elements 20, 21, 22, and 23 that are circumscribed around a ball 25, and these head elements 20 to 23 are supported by the main body housing 11 via a support ring 24. It is configured. Reference numeral 26 denotes a biasing member that goes around the head elements 20 to 23 below the support ring 24, and when it contracts, it biases each element in the direction in which the insertion side ends of the head elements 20 to 23 come together. do.

FIG. 5 is a detailed sectional view showing the fixed part of the support ring 24;
FIG. 6 is a plan view of the support ring 24.

27 and 29 are holding plates fixed to the main body housing 11 by screws 31 and 32, respectively, and the support ring 2
4 is a bottle 28.30 protruding from the holding plate 27.29
are fixed to the main body housing 11 by engaging with the holes 24d and 24e of the support ring. The support ring 24 has a slit 24a in a part thereof, and has protrusions 24b and 24C on the inner side of the sleeve 24a and on the opposite side. The slit 24a is provided so that the support ring 24 can be easily engaged with the groove provided on the outer periphery of the head elements 20 to 23 by pushing and expanding the slit 24a.
b, 24C are provided to prevent each of the head elements 20 to 23 from rotating inside the support ring 24.

Below, the operation of each member in this example is shown in Figures 2 and 7.
This will be explained using figures. First, as shown in FIG. 2(a), with the insertion side ends of the head 19 assembled, the tool is moved to the center position of the insertion hole of the target trimmer component and inserted. Next, the internal motor 16 is rotated a predetermined number of revolutions to lower the cylindrical member 13 and separate the insertion side end of the head 19. At this time, as shown in FIG. 7, if the insertion hole 34 of the trimmer component 33 has a (+) groove shape and the position of each head element in the rotational direction matches the extraction groove, Insertion side ends 20 of head elements 20 to 23
a to 23a are stored in their respective grooves, and the trimmer parts 33
It becomes possible to perform 0 rotation adjustment. By making the insertion holes of the head element discrete in this way, it is made to correspond to the groove shape of the insertion holes, so that by adjusting the amount of descent of the cylindrical member, regardless of the shape or size of the insertion holes, The trimmer component can be rotated and adjusted.

Next, the advantages when each head element is formed from a flexible material such as a leaf spring material and a plastic resin will be explained with reference to FIG. Depending on the position of each head element in the rotational direction, as shown in the same figure, the insertion side end 20a~
Even if the ends 23a are separated, the ends may not be accommodated in the eight grooves of the insertion hole 34 in some cases. In such a case, if the head element is made of a flexible material, if the cylindrical member 13 is lowered by the same amount of descent as shown in FIG. 7 without adjusting the position of the head element in the rotational direction, Also, the head element can be elastically deformed to disperse the force applied to the trimmer part 33. Note that if the rotation adjustment operation of the trimmer component is started in this state, the insertion side end 20a of the head element
23a are naturally accommodated in the eight grooves of the insertion hole 34, so the rotation of the trimmer parts can be adjusted in the same manner as in FIG.

In the embodiment described above, the insertion hole of the trimmer component has a (+)-shaped groove shape, but by increasing the number of head elements, that is, the number of divisions of the head, For example, the same head can be used for both (+) type groove shape and (-) type groove shape.

Effects of the Invention As detailed above, according to the invention, the discrete state of the insertion side end of the head element can be adjusted by the amount of descent of the cylindrical member, so that the size or shape of various insertion holes can be adjusted. The insertion hole eliminates the need to replace the head.

In addition, by forming the head element from a flexible material,
This has the effect of eliminating the need for highly accurate positioning and rotational direction adjustment for inserting the head into the insertion hole.

[Brief explanation of the drawing]

FIG. 1 is a diagram of the principle of the present invention, and FIG. 2 is a diagram of an embodiment of the present invention, in which the entire tool is shown in a state (a) in which the insertion side ends of the head elements are assembled and in a state in which they are separated (b). The sectional view and FIG. 3 are illustrations of an embodiment of the present invention, and the top view (a), front view (b) and bottom view (C) of the head, and FIG. 4 are illustrations of an embodiment of the invention. , a plan view (a), a vertical cross-sectional view (b), and a bottom view (C) of the cylindrical member.
, FIG. 5 is an embodiment of the present invention, which is a detailed cross-sectional view of the fixed part of the support ring. FIG. 6 is an embodiment of the present invention, which is a plan view of the support ring. FIGS. 2A and 2B are cross-sectional views taken along line (a) and (b) (b), showing a state in which the insertion side end of the head element is accommodated in the 8 grooves of the insertion hole of the trimmer component; FIGS. (
b), FIG. 8 is an embodiment of the present invention, and is a plan view (A) and (B) showing a state in which the insertion side end of the head element is not accommodated in the groove of the insertion hole of the trimmer component. (B) A sectional view taken along line (B) and FIG. 9 are diagrams for explaining the prior art. 1.1 2.2 3.2 5.2 7.1 9... Head, 0.21,22° 4... Support ring, 6... Biasing member, 3... Cylindrical member. 23...Head element,

Claims (2)

[Claims] (1) In a shaft-type automatic adjustment head in which the head (1) of the tool is inserted into a trimmer component on a printed wiring board for rotational adjustment, the head (1) is composed of a plurality of head elements (2), The plurality of head elements (2) are each swingably supported inside a support ring (3), and the head elements (2) are arranged in the direction in which the ends (4) on the insertion side into the trimmer part gather together. A biasing member (5) for biasing the head element (2) is provided, and the rear end (6) on the side opposite to the insertion side end (4) of the head element (2) is connected to the cylindrical member (7). By bringing the cylindrical member (7) into contact with the tapered wall surface (8) and moving the cylindrical member (7) up and down relative to the head (1), the insertion side end (4) of the head element (2) can be assembled and assembled. A shaft-type automatic adjustment head characterized by a discrete adjustment head. 2. A shaft-type self-adjusting head according to claim 1, characterized in that said head element (2) is made of a flexible material.