JPS6351513B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a motorized timer.

In the case of a motor-type timer in which the timer time is set by manually rotating the set dial, and the internal mechanism is driven by a motor to turn the switch on or off after the set time has elapsed, conventionally the set dial is used to set the timer time. A switch is provided inside to detect whether or not the motor is in the off position, and this switch starts and stops the motor.
According to this structure, when the set dial is turned to a position other than the off position (scale position), the motor starts immediately. In other words, the motor is already started while the set dial is being set, and during this time a load is applied to the motor and its rotation is interrupted by the slip mechanism.
Another drawback was that the battery was wasted. Furthermore, in this type of timer, since the set dial itself is rotationally driven, if a click mechanism is attached, it becomes a load, and it is actually difficult to attach a click mechanism.

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 written on the front surface of the 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. An operating portion 15 is integrally formed extending from the middle portion of the click lever 9, and this operating portion 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
is completely covered as shown in the first diagram. In addition,
From the operation display window 16, an operation display such as a blinking lamp 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 this 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 the cases 1 and 2, there is a printed circuit board 1.
9 is provided, and two contact pieces 20:21 are stacked vertically on this printed circuit board 19 to face each other.
The contact pieces 20 and 21 constitute the switch SW ₁ shown in FIG. 4, and are normally in contact with each other. and,
One contact piece 20 projects forward through the window hole 22 of the front case 1 and faces the tip of the click lever 9. Further, inside the cases 1 and 2, a motor M for driving a timer mechanism 3 and a sounding device S such as a buzzer for notifying when a set time has elapsed are provided. A drive circuit is configured on the printed circuit board 19. In FIG. 4, 23 is an integrated circuit, 24 is a crystal resonator, C ₁ and C ₂ are load capacitances thereof, R is a resistor, Tr is an amplification transistor, and E is a power supply. Further, the switch SW ₂ is attached to the timer mechanism 3 and is opened and closed by it, and is closed when a set time has elapsed, thereby causing an alarm to be output from the alarm output terminal AL ₀ of the integrated circuit 23. A signal is generated 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 25 formed in the front case 1 in FIG. 3, and is radiated forward.

Next, the operation will be explained. When the set dial 5 is in the OFF position, the click lever 9 is in the position shown in Fig. 3, the contact pieces 20 and 21 are in contact, and the switch SW ₁ in Fig. 4 is closed. . switch
By closing SW ₁ , the integrated circuit 23 is held in a reset state, and its crystal oscillator 24 and motor M are stopped. Then, turn the set dial 5 by hand to set the 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) Then, when the operating part 15 of the click lever 9 is pushed down with a fingertip, the spring force of the spring 14 rotates the click lever 9 clockwise when the pin 12 is displaced downward beyond the neutral line. Switch to energize,
The click lever 9 is held in a state in which it abuts against the pin 13 (FIG. 6). At this time, the tip of the click lever 9 pushes up the contact piece 20 to open the switch _SW1 . This allows integrated circuit 2
A signal is generated from the crystal drive terminal XT of No. 3, causing the crystal resonator 24 to oscillate, and the oscillation frequency is appropriately stepped down by the frequency dividing stage in the integrated circuit 24 and output from the motor output terminal OVT, OVT ₂ . A motor drive signal is sent, and motor M rotates at a predetermined speed. Further, due to the rotational displacement of the click lever 9, the claw portion 11 is disengaged from the click groove 8, so that the set dial 5 is released in an unrestrained state, and the operation display window 16, which has been hidden behind the operating section 15, is opened. is exposed and the operation display becomes visible. As time passes, the cylindrical portion 7 (set dial 5) rotates counterclockwise, and finally, when the set time has elapsed (Fig. 7)
The switch SW ₂ shown in FIG. 4 is closed, thereby generating an alarm signal from the alarm output terminal AL ₀ of the integrated circuit 23, and the sounding device S is activated via the transistor Tr, indicating that the set time has arrived. report the matter. 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 close to the off position, the pin 12 is displaced upward beyond the neutral line, and the click lever 9 receives a counterclockwise rotational force under the action of the spring 14 and is automatically turned off. The operation display window 16 is again hidden behind the operation section 15 and is no longer visible.
(Fig. 8) Also, when the click lever 9 returns to its original position, the engagement with the contact piece 20 is released and the switch is turned off.
SW ₁ is closed, thereby stopping the operation of the integrated circuit 23 and causing the oscillation of the crystal oscillator 24 and the motor M.
stops rotating.

In the actual embodiment, the click groove 8 is formed integrally with the set dial, but due to injection molding, a disc-shaped member separate from the set dial 5 is provided, and the click groove is formed in this member. The spindle 4
For example, it may be fixed at a position behind the set dial 5. Further, the drive circuit is not limited to the above embodiment, and the point is that the motor M is controlled by the switch _SW1 .
Any configuration is sufficient as long as it controls starting and stopping.

According to the present invention described in detail above, in a motor-type timer in which a timer time is set by manual rotation of a set dial and a switch is turned on or off after the set time has elapsed using a motor as a drive source, an internal Since the click mechanism can be attached without putting a load on the mechanism, the timer time can be set accurately. Moreover, since the switch for the motor is opened and closed using the position change of the click lever at that time, the click lever is also used as a starting switch lever, so the battery is not wasted during the set operation. As a result, the battery life is extended, and there is no need to apply a reverse load to the motor during the setting operation.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention,
Fig. 1 is a front view, Fig. 2 is a sectional view taken along the line of Fig. 1, Fig. 3 is a sectional view taken along the line of Fig. 2, Fig. 4 is a drive circuit diagram, and Figs. FIG. 3...Timer mechanism, 4...Main shaft, 5...Set dial, 8...Click groove, 9...Click lever, 14...Switching spring, 15...Operation unit, 17
...Protrusion, _SW1 , _SW2 ...Switch, M...Motor.

Claims (1)

[Claims] 1. In a timer that sets a timer time by manual rotation of a set dial and 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 regular intervals, a click lever that can be engaged with and disengaged from the click groove is rotatably supported, and the click lever is brought into elastic contact with the click groove when the set dial is set, and the set operation is performed. A switching spring is provided to hold the click lever in a position separated from the click groove when the click lever is manually rotated after completion of the setting, and after a set time has elapsed, the switch spring engages with a part of the click lever to release the click lever into the click groove. A restoring cam that rotates and returns to a position where it contacts the groove elastically is formed on either the set dial or the member,
A motor-type timer comprising a switch that is opened and closed by rotational displacement of the click lever to control starting and stopping of the motor.