JPS6262410B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motor-type timer in which a timer time is set by manual rotation of a set dial, and which is driven by a motor to turn on or off a switch after the set time has elapsed.

Some clocks with a reference mechanism are equipped with a click mechanism so that the reference time can be set accurately, but in the case of the above-mentioned timers, the set dial itself is rotationally driven, so the click mechanism is not required. The disadvantage of attaching it was that it added a load.

The present invention has been made in view of the above-mentioned circumstances, and one embodiment thereof will be described below.

1 and 2, a well-known timer mechanism 3 is disposed inside a front case 1 and a rear case 2, and its main shaft 4 projects forward through the front case 1. A disc-shaped set dial 5 is attached to the protruding end of the main shaft 4, and a timer time scale 6 is marked on the front surface of the disc-shaped set dial 5. By manually turning the set dial 5 clockwise, the desired timer can be set. You can set the time. A cylindrical portion 7 is formed concentrically on the inner side surface of the set dial 5, and knurled click grooves 8 are carved on the outer circumferential surface of the set dial 5 in correspondence with the time scales, as shown in the third figure. The click lever 9 is rotatably supported by a shaft portion 10 protruding from the front surface of the front case 1, and a claw portion 11 at the tip thereof can be engaged with the click groove 8.
A switching spring 14 is stretched between a pin 12 protruding from the rear end of the click lever 9 and a pin 13 protruding from the front surface of the front case 1, and the rotation of the click lever 9 caused by the spring 14 is The direction of the force varies depending on the position of the pin 12 with respect to the straight line (neutral line) connecting the shaft 10 and the pin 13. In the state shown in FIG.
1 is elastically engaged with the click groove 8. A shielding plate 15 is integrally formed extending from the middle part of the click lever 9, and this shielding plate 15 extends toward an operation display window 16 provided on the front surface of the front case 1.
In the state shown in FIG. 3, in which the click lever 9 is in the elastic contact position with respect to the click groove 8, the operation display window 16
as shown in the first figure. In addition,
From the operation display window 16, an operation display such as a flashing lamp or the like can be seen from the front of the case while the timer is operating. Furthermore, a protrusion 17 is formed from the upper surface of the rear end of the click lever 9 toward the cylindrical portion 7, and when the set dial 5 is in the OFF position, the restoring cam 18 facing the protrusion 17 is moved toward the cylindrical portion. 7 (on the left side of the click groove 8 in FIG. 2). The functions of the protruding portion 17 and the restoring cam 18 will become clearer from the explanation of the operation described below.

Also, inside both cases 1 and 2, there is a timer mechanism 3.
A motor M for driving a motor M and a sounding device S such as a buzzer for notifying when a set time has elapsed are provided, and are controlled via a well-known drive circuit shown in FIG. In FIG. 4, 19 is an integrated circuit, 2
0 is the crystal oscillator, C ₁ and C ₂ are its load capacitance,
R is a resistor, Tr is an amplification transistor, E is a power supply, and SW ₁ and SW ₂ are switches opened and closed by the timer mechanism 3. Switch SW ₁ closes only when the set dial 5 is in the off position, keeping the integrated circuit 19 in the reset state and closing the switch SW 1.
_SW2 is closed when the set time has elapsed, so that the integrated circuit 19 generates an alarm signal from the alarm output terminal _AL0 , and the sounding device S is activated via the transistor Tr. Note that the sound from the sound generating device S passes through the gap between the front case 1 and the set dial 5 through an opening 21 formed in the front case 1 in FIG. 3, and is radiated forward.

Next, the operation will be explained. First, as shown in FIG. 1, the set dial 5 is turned by hand to set a desired time, for example, 10 minutes. At this time, the claw portion 11 of the click lever 9 engages with exactly the tenth groove of the click groove 8, and the set dial 5 is accurately positioned (FIG. 5). At this time, switch SW ₁ in Figure 4
is opened, the reset hold of the integrated circuit 19 is released, a motor drive signal is generated from the output terminals OVT ₁ and OVT ₂ , and the motor M is started. Then, when the shielding plate 15 of the click lever 9 is pushed down with a fingertip, when the pin 12 crosses the neutral line and is located below, the spring 14 is switched to bias the click lever 9 to rotate clockwise. Crit lever 9
is kept in contact with the pin 13 (FIG. 6). As a result, the operation display window 16, which has been hidden behind the shielding plate 15, is exposed and the operation display can be viewed. The cylindrical portion 7 rotates counterclockwise as time passes, and when the set time has finally elapsed (Fig. 7), the switch SW ₂ shown in Fig. 4 is closed, and the sounding device S is thereby activated. to notify that the set time has arrived. At this time, the restoring cam 18 has moved close to the protruding part 17, and the cylindrical part 7 continues to rotate for a while, until finally the restoring cam 18 comes into contact with the protruding part 17 and begins to push it up. Then, when the set dial 5 is near the off position as shown in the first figure, the pin 1
2 is displaced upward beyond the neutral line, and as a result, the click lever 9 is automatically returned to its original position by receiving a counterclockwise rotation force by the action of the spring 14, and the operation display window 16 is again covered. It is hidden behind the plate 15 and becomes invisible (Fig. 9). Also, at this time, the switch SW ₁ is closed and the output terminals OVT ₁ and OVT ₂ of the integrated circuit 19 are closed.
The motor drive signal from the motor M is interrupted and the motor M stops.

In the above embodiment, the click groove 8 was formed in a part (cylindrical part 7) integrated with the set dial 5, but the click groove was formed in a disc-shaped member separated from the set dial 5, and this member was connected to the main shaft 4. It is also possible to fix it, for example, at a position behind the set dial 5.

As described above, according to the present invention, in the motor-type timer, the timer time is set by manual rotation of the set dial, and the load switch is turned on or off after the set time has elapsed by being driven by the motor. Even if a mechanism is attached, it does not become a load, so not only can the timer time be set accurately, but also low torque driving is possible. Also, since the click lever automatically returns, there is no need to make any operational mistakes when setting the timer. Moreover, since a shielding plate is provided integrally with the click lever so that the operation display window is covered or exposed, it is possible to accurately confirm whether or not the click lever is in operation.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention,
Figure 1 is a front view, Figure 2 is a cross-sectional view taken along the line in Figure 1, Figure 3 is a cross-sectional view taken along Figure 2, Figure 4 is a drive circuit diagram, and Figures 5 to 8 are clickable. FIG. 6 is an operating state diagram showing the relationship among the lever, click groove, restoring cam, and operation display window. 5... Set dial, 7... Cylindrical portion, 8... Click groove, 9... Click lever, 14... Switching spring, 15... Shielding plate, 16... Operation display window, 1
7... Protrusion, 18... Restoration cam, SW ₁ , SW ₂ ...
...Switch, M...Motor.

Claims (1)

[Scope of Claims] 1. A timer that sets a timer time by manual rotation of a set dial and is driven by a motor to turn on or off a switch after the set time has elapsed; A large number of click grooves are formed at equal intervals on a member that rotates together, and a click lever that can be engaged and detached from the click groove is rotatably supported, and the click lever is inserted into the click groove when the set dial is set. A switching spring is provided which brings the click lever into elastic contact and holds the click lever in a detached position from the click groove when the click lever is manually rotated after the completion of the setting operation, and which engages with a portion of the click lever after the set time has elapsed. A timer characterized in that a restoring cam is formed on either the set dial or the member for rotationally returning the click lever to a position where it comes into elastic contact with the click groove. 2. In a timer whose timer time is set by manual rotation of a set dial and which is driven by a motor to turn the switch on or off after the set time has elapsed, a part of the set dial or a member that rotates together with the timer is A large number of click grooves are formed at equal intervals, a click lever that can be engaged with the click groove is rotatably supported, and the click lever is brought into elastic contact with the click groove during a setting operation by manual rotation of the set dial. A switching spring is provided to hold the click lever in a position where it is removed from the click groove by manually rotating the click lever after the completion of the setting operation, and after the set time has elapsed, the switching spring engages with a part of the click lever to A restoring cam for rotationally returning the click lever to a position where it contacts the click groove elastically is formed on either the set dial or the member, and a shielding plate is formed integrally extending from the click lever, and the shielding plate includes: The timer is characterized in that the operation display window is covered when the click lever is in a position in elastic contact with the click groove, and the operation display window is exposed when the click lever is in a position away from the click groove. .