JPS6125154Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a range switching device for an electronic timer.

Conventionally, as shown in FIG. 1, a rotary shaft 4 of a time setting variable resistor is rotatably protruded from the top surface of a box 2 containing an electronic timer circuit, and an opening 5 for inserting the rotary shaft is provided. A set time display scale plate 6 is prepared in the number corresponding to the range of the electronic timer, and when changing the range of the electronic timer, the scale plate is replaced and the changeover switch 10 provided on the top surface of the box 2 is set to the scale. There was an electronic timer that switched by setting the range to correspond to the plate. However, in such a method, it is necessary to replace the scale plate 6 and set the changeover switch 10, which is relatively time-consuming, and has the disadvantage that if the switch 10 is set incorrectly, it will not correspond with the scale plate 6. It was hot. Further, as shown in the embodiment shown in FIG. 2, two micro switches 12, 12 are built inside the box, and the range can be controlled by inserting any of the four types of claw-like bodies 11 through the hole 13 provided on the top surface of the box. There was also an electronic timer that could be switched. However, in such a system, although the status of the time setting range of the electronic timer is obvious at a glance, it has the disadvantage that it is easy to make mistakes in setting the time because the scale plate 6 must be shared between different ranges. .

The purpose of the present invention is to eliminate such drawbacks of the conventional example and to provide a range switching device that can automatically switch the time setting range by simply replacing the scale plate 6 without any switch operation. It is something to do.

The configuration of the present invention will be described below with reference to an embodiment. As shown in FIG. 4, a rotary shaft 4 of a time setting variable resistor 3 is rotatably protruded from the top surface of a box 2 containing an electronic timer circuit 1. together with the third
As shown in Figure a, in an electronic timer in which a set time display scale plate 6 having an opening 5 into which the rotating shaft 4 is inserted is disposed on the top surface of the box, it is close to the bottom surface of the top plate of the box. In addition to arranging a plurality of magnetically sensitive switches 9, a scale plate 6 made of a magnetic plate is removably attached to the top surface of the box, and each magnetically sensitive switch is arranged on the back surface of each scale plate, which displays different time display ranges. As shown in FIG. 3B, a plurality of positions corresponding to 9 are selectively magnetized, and the time setting range is changed by the magnetically sensitive switch 9. Here,
As the magnetically sensitive switch 9, an element such as a reed switch or a Hall element that can detect the presence or absence of magnetism at a nearby position is used.
In addition, the top plate of box 2 of the electronic timer is made of a non-magnetic plate to allow magnetic lines of force to pass in and out, and the other surfaces of the box are made of magnetic plates to prevent malfunctions, providing magnetic shielding. This is desirable.

When using the electronic timer according to the present invention, first select the range corresponding to the required setting time, and place the scale plate 6 corresponding to the range on the upper plate of the box 2. At this time, the back surface of the scale plate 6 made of a magnetic material is selectively magnetized at the location corresponding to the range of the scale plate, as shown in FIG. 3b. A specific one of the sensitive switches 9 detects the magnetized portion,
The time setting range of the electronic timer circuit 1 is switched to the range corresponding to the scale plate 6. Therefore, by rotating the grip 7 provided on the box 2 and setting the variable resistor 3 so that the set time on the scale plate 6 becomes the desired value, the operator can easily perform range switching operations. You can set the electronic timer without having to do so.

According to such a system, as in the conventional example shown in FIG.
There is an advantage that it does not require the trouble of resetting 0, and since there is a one-to-one correspondence between the dial and the set time range, mistakes in setting the range cannot occur. Furthermore, since the scale plate 6 is replaced for each range, there is no possibility of erroneous reading of the scale plate as in the conventional example shown in FIG. Furthermore, in the range switching device according to the present invention, there is no need to mechanically switch the range, and the range can be switched using a magnetically sensitive switch, which is a non-contact type switch. Since there is no need to make holes in the upper plate of the switch, the switch has a dust-proof structure and has the advantage of increasing the reliability of the changeover switch.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of a conventional example, FIG. 2 is a schematic perspective view of another conventional example, FIG. 3 a is a schematic perspective view of an embodiment of the present invention, and FIG. figure,
FIG. 4 is a schematic sectional view of the same as above. 1 is an electronic timer circuit, 2 is a box, 3 is a variable resistor, 4 is a shaft, 5 is an aperture, 6 is a scale plate, 7 is a gripping portion, 8 is a magnetized portion, and 9 is a magnetically sensitive switch.

Claims (1)

[Scope of utility model registration request] A rotary shaft of a variable resistor for time setting is rotatably protruded from the top surface of the box containing the electronic timer circuit, and a scale plate for displaying the set time having an opening for fitting the rotary shaft is provided on the top surface of the box. In the electronic timer, a plurality of magnetically sensitive switches are arranged close to the bottom surface of the top plate of the box, and a scale plate made of a magnetic plate is removably attached to the top surface of the box, allowing for different time settings. A range switching device for an electronic timer, which is configured by selectively magnetizing a plurality of positions corresponding to the magnetically sensitive switch on the back side of each scale plate displaying the range, and switching the time setting range by the switch.