JPH0244626A - Electronic timer device - Google Patents

Abstract

PURPOSE:To surely prevent malfunction in the position with dial graduation 0 by furnishing a dial graduation zero position sensing mechanism, which senses the position 0 on the dial graduation and sets the time limit of a time limit setting circuit to zero. CONSTITUTION:When it is desired to forcedly finish the time limiting motion for the purpose of maintenance or adjustment while a timer device is in service with a long time range, for ex. 100hr range, a dial 1 is returned to the position with graduation 0 on the indication scale, and now a cam 7 is driven together with a variable resistor 2, and a boss 8a on a follower piece 8 is fitted in a recess 7a of this cam 7 in the position with graduation 0 on the dial 1. Accordingly the follower piece 8 displaces, and a normally open fixed contact 9 is closed with a movable contact 10, and a time limit setting circuit 3 sets momentarily the time to 'zero'. Therefore, the time limit 'zero' is set certainly only with restitution of the dial 1 to graduation 'zero' position even though the resistance value does not become zero ohm precisely from the characteristic of the variable resistance 2.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electronic timer device suitable for multiple time specifications.

<Prior art and problems> The configuration of a conventional timer device of this type is shown in Fig. 4. In the figure, l is a dial for setting a time limit, 2 is a variable resistor operated by the dial 1, and 3 is a variable resistor. 4 is a relay driven by the output of the time setting circuit 3, and 5.6 is an output terminal that is opened and closed by the relay contact 4a of the relay 4.

In the above configuration, when the time limit setting operation dial l is operated to set the desired time limit, the time limit setting circuit 3 sets the time limit according to the resistance value of the variable resistor 2, and when the predetermined time comes, the relay 4 is activated. Driven.

In the above conventional device, the time setting circuit 3 converts the resistance value of the variable resistor 5 operated by the dial 1 into a time limit, so multiple time specifications, especially a long range such as the 100 hour range, are selected. Even if the dial l is set to the "0" position on the scale for maintenance or adjustment, the resistance value of the variable resistor 2 will not become zero ohm due to its characteristics, for example in the 100 hour range. , there is a problem where the timed operation continues for more than an hour.

<Object of the Invention> The present invention was made in order to solve the problems of the above-mentioned conventional ones, and its purpose is to provide an electronic timer device that can reliably prevent timed operation at the dial scale rQJ position. There is.

<Configuration and Effects of the Invention> The electronic timer device according to the present invention is such that a time limit is set by a time limit setting circuit according to the resistance value of a variable resistor driven by a time limit setting operation dial. A dial scale zero position detection mechanism is provided for detecting the "0" position of the dial scale and setting the time limit of the time limit setting circuit to zero.

According to this invention, when the dial scale is at the "0" position, the time limit is forcibly set to zero regardless of the resistance value of the variable resistor. It is possible to reliably prevent malfunctions in certain positions.

<Description of Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing an example of an electronic timer device according to the present invention, and parts that are the same as those of the conventional device shown in FIG.

In the figure, numeral 7 denotes a cam integrally formed with the dial 1, and a spring driven piece 8 whose base end is supported is in sliding contact with the circumferential surface of the cam. On the circumferential surface of the cam 7, there is a time display scale "0" shown in FIGS. 2 and 3.
A recess 7a is formed corresponding to the "0" position of the dial l, into which the protrusion 8a of the driven piece 8 is removably fitted. Reference numeral 9 denotes a normally open fixed contact inserted between the timed zero operation terminal 3a of the timed setting circuit 3 and the ground, and is set to be opened and closed by a movable contact 10 fixed to the tip of the driven piece 8. Together with the cam 7, driven piece 8, movable contact 10, etc., it constitutes a dial scale zero position detection mechanism 11.

In addition, in FIGS. 2 and 3, 22 is a window frame for displaying scale numbers, 23 is a pointer, 24 is a scale number changeover switch, 2
5 is a window frame for hourly display, 26 is a time-up display, 2
Reference numeral 7 designates an operational function changeover switch, 28 a window frame for operational function display, 29 a time unit changeover switch, 30 a case, and 31 a cover.

Next, the operation of the above configuration will be explained.

The basic operation of the timer device is the same as the conventional one, in which a desired time limit is set by operating the dial 1, and the relay 4 is activated after a predetermined period of time.

Now, if you want to forcibly end the timed operation for maintenance or adjustment while the timer device is being used in the long range, for example the 100 hour range, if you return the dial 1 to the "0" position on the display scale 21. The cam 7 is driven together with the variable resistor 2, and the protrusion 8a of the driven piece 8 fits into the recess 7a of the cam 7 when the scale of the dial 1 is at the "0" position. Therefore, the driven piece 8 is displaced and the normally open fixed contact 9 is closed by the movable contact 10, so that the time limit setting circuit 3 instantaneously sets the time limit to "zero". Therefore, at this time, even if the resistance value of the variable resistor 2 does not become exactly zero ohm due to its characteristics, if the dial 1 returns to the scale rQJ position, the timer 2 will definitely be set to ``timer zero''. Become. In other words, when the microwave oven is used for a long time, malfunctions such as timed operation at the "O" position of the scale of the dial 1 are prevented, and reliability is improved.

In addition, in the above example, since the protrusion 8a of the driven piece 8 is fitted into the recess 7a of the cam 7 at the scale rOJ position of the dial 1, incorrect setting of the dial 1 below the scale "0" position is prevented. At the same time, the setting of the dial 1 to the "0" position on the scale can be visually and tactually confirmed by the click feeling when the protrusion 8a is fitted into the recess 7a by the force of the driven piece 8, making it easy to use. It becomes easier.

Of course, the dial scale zero position detection mechanism 11 is not limited to the one using the cam 7 and the driven piece 8 as described in ``2'', but can adopt an appropriately modified structure.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an example of an electronic timer device according to the present invention, FIGS. 2 and 3 are a perspective view and a front view of the same device, respectively, and FIG. 4 is a diagram showing a conventional electronic timer device. This is a schematic configuration diagram shown below. ■...Dial for time limit setting operation, 2...Variable resistor, 3...Time limit setting circuit, 1...Dial scale zero position detection mechanism.

Claims (1)

[Claims] (1) In an electronic timer device equipped with a variable resistor driven by a dial for time setting operation, and a time limit setting circuit that sets a time limit according to the resistance value of the variable resistor, the scale of the dial is "0". An electronic timer device comprising a dial scale zero position detection mechanism that detects the position and sets the time limit of the time limit setting circuit to zero.