JPH0218503Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field The present invention is a switch device for various instructions such as taring an electronic balance and changing the range. The present invention relates to a switch device for an electronic balance in which a switch push button is pressed from the outside through the cover.

(b) Prior art In a device in which a pushbutton switch attached to a printed circuit board is hermetically housed in a case, the switch is operated by pressing the pushbutton of the switch from above the dustproof and waterproof membrane attached to the case. However, in this case, the distance between the push button and the membrane cannot be adjusted while the case is covered.
At the request of the user, the case was removed, the number of adjustment shims was increased or decreased, and the feel of the switch and the degree of engagement were adjusted. For this reason, adjustment took time and there were many variations.

(C) Purpose The present invention aims to eliminate the drawbacks of the above-mentioned prior art, and to provide a switch device for an electronic balance that can provide the best feel of the pushbuttons without removing the main body from the case, and can be adjusted to eliminate variations in each pushbutton. purpose.

(D) Structure The present invention is an electronic balance switch device in which the entire switch is covered in a case to make it airtight, and the push button of the switch is pressed from the outside through the cover, in which the head is inside the cover. It has an abutting adjustment shaft and a holding arm that fixes the adjustment shaft so that it can move and adjust in the axial direction, and a part of the arm abuts or fixes the push button, and the adjustment shaft has a lower end surface thereof. This is a switch device for an electronic balance, characterized in that it is provided with a groove for fitting with a driver, and that the groove for fitting faces a hole for inserting the driver provided in the lower case of the balance.

(E) Embodiment FIG. 1 is a partial sectional view of the main part of the embodiment, and FIG. 2 is a perspective view of the holding arm. Further, FIGS. 3 and 4 each show other embodiments.

The embodiment shown in FIGS. 1 and 2 will be described. A printed circuit board 3 is fixed within an upper case 1 and a lower case 2 of an operating section of an electronic balance, and a switch 4 is provided on this printed circuit board 3. A holding arm 6 is provided so as to come into contact with a push button 5 which is a movable part of the switch 4. The holding arm 6 is a plate-like member having restoring force, and has a screw hole 7 vertically communicating with the U-shaped bent portion 6a on the distal end thereof.
7 is provided. The base end side of the holding arm 6 is bent 6b into a hook shape and fixed 8 to the substrate 3. This allows the holding arm 6 to be supported in a cantilevered manner. The holding arm 6 comes into contact with the push button on the back side of the plate midway between the U-shaped bent portion 6a and the hook-shaped bent portion 6b. Further, the side edges of the holding arm 6 may be bent to form reinforcing ribs 6c.

An adjustment shaft 9 passes through screw holes 7, 7 of the holding arm 6 and is fixed thereto by screws. The adjustment shaft 9 has its head 9
a comes into contact with the inside of a dustproof and waterproof membrane-like cover 10 attached to the upper case 1, and its lower end protrudes toward the lower case 2 side through the hole 11 of the board 3. A groove 9b formed on the lower end surface of the adjustment shaft 9 faces the driver insertion hole 12. Adjustment of the adjustment shaft 9 is carried out by inserting a screwdriver through the hole 12 of the lower case 2, fitting it into the groove 9b, and turning the screwdriver to move the adjustment shaft 9 in the axial direction. Looseness of the screw when fixing the adjustment shaft 9 to the holding arm 6,
The shaking is prevented by utilizing the restoring force of the U-shaped bent portion 6a of the holding arm 6. That is, the spacing between the two screw holes 7, 7 of the bent portion 6a will be in a state that is slightly different from the normal state when the adjustment shaft 9 is screwed, so a restoring force acts, and therefore the two screw holes 7 , 7 come into contact with the adjacent threads of the adjusting shaft 9 with pressing forces in opposite directions, thereby preventing the adjusting shaft 9 from loosening or rattling.

FIG. 3 shows a second embodiment, in which the holding arm 20
The base end of the switch 4 is directly fixed to the push button 5 of the switch 4. Other configurations are shown in Figures 1 and 2.
This is the same as in the embodiment.

FIG. 4 shows the embodiment of FIG.
0, the adjustment shaft 9 is screwed as it is to the holding arm 30 without adopting a structure like the U-shaped bent part in the first and second embodiments, and this holding arm 30 is directly connected to the push button of the switch 4. It is fixed at 5. Although this example has the problem of loosening and rattling of the adjustment shaft 9, it has the advantage of greatly simplifying the device.

In the present invention, the adjustment shaft 9 is connected to the holding arms 6, 2.
Although it is important to fix the adjustment shaft 9 with screws at 0 and 30, since it is necessary to both fix the adjustment shaft 9 and adjust its movement,
It is not limited to this. Other means by which the adjustment shaft 9 can be fixed to the holding arm 6, 20, 30 so as to be movable in the axial direction may be used. In addition, the cover 10 requires some elasticity in order to push down the push button 5 through it. It may be a member of In addition, adjust the position of the adjustment shaft 9 to the board 3.
The hole 11 in the substrate 3 is not required if the hole 11 is located away from the substrate 3.

(F) Effects With conventional devices where the switch is sealed inside the case for dustproofing and waterproofing, it is necessary to remove the case many times to adjust the feel and operation of the pushbuttons. The adjustment shaft that should be adjusted to a position that is in contact with or close to the cover of the
Since it has its own adjustment mechanism, it can be adjusted very easily. Moreover, a fitting groove is provided on the lower end surface of this adjustment shaft, which faces the driver insertion hole provided in the lower case.
To eliminate variations among push buttons by easily adjusting the feel of the push buttons from under the case without taking out the push button mechanism from the main body case.

Further, the switch adjustment time is shortened, variations in the feel of switch operation can be prevented, and no skill is required. In addition, if the holding arm is made of a plate-like member with restoring force, and the adjustment shaft is fixed with screws through two screw holes provided in the U-shaped bent portion of the holding arm, which communicate with each other vertically, rattling or loosening of the adjustment shaft can be prevented. , ensuring accurate switch operation feel.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a main part of an embodiment, FIG. 2 is a perspective view of a holding arm, and FIGS. 3 and 4 are partial sectional views of main parts of other embodiments. 1... Upper case, 2... Lower case, 3... Printed circuit board, 4... Switch, 5... Push button, 6
...Holding arm, 6a...U-shaped bent portion, 7...
...screw hole, 9...adjustment shaft, 9a...head of adjustment shaft, 9b...groove of adjustment shaft, 10...cover, 12...
...holes in the lower case, 20, 30...holding arm.

Claims (1)

[Claims for Utility Model Registration] (1) In a switch device for an electronic balance in which the entire switch is covered in a case to make it airtight, and a push button of the switch is pressed from the outside through the cover, has an adjustment shaft that abuts on the inside of the cover and a holding arm that fixes the adjustment shaft so that it can move and adjust in the axial direction, a part of the arm abuts or fixes the push button, and the adjustment shaft A switch device for an electronic balance, characterized in that a lower end face has a groove for fitting with a driver, and the groove for fitting faces a hole for inserting a driver provided in a lower case of the balance. (2) A utility model in which the holding arm is a plate-like member with restoring force, a screw hole is provided in the U-shaped bent part on the tip side that communicates vertically, and the adjustment shaft is screwed into the screw hole. A switch device for an electronic balance according to claim 1. (3) A switch device for an electronic balance according to claim 2, wherein the base end of the holding arm is fixed to a base plate and supported in a cantilever manner, and abuts on a push button at a midway position of the holding arm. (4) Claims 2 or 3 of the utility model registration in which the side edges of the holding arm are bent to form reinforcing ribs.
The electronic balance switch device described in Section 1.