JPS6224929Y2 - - Google Patents

Description

[Detailed description of the invention] This invention makes a bell ring simultaneously when a switch is turned off or on after a set time has elapsed, or rings a bell a desired amount of time earlier or later than when the switch is turned off or on. This relates to an alarm timer that emits a warning sound.

Various alarm timers of this type have been proposed in the past, but all of them are relatively complex, with a switch, a mechanism for turning it on and off, and a so-called bell-striking mechanism for ringing a bell being almost integrally incorporated. Therefore, not only is it expensive, but the switch or alarm operation is prone to failure, and there are also problems with durability. In addition, the vast majority of timers of this type use a clock device that uses a mainspring as a driving source, but this clock device is extremely sensitive to dirt and dust. If it gets inside the timer, there is a risk that the clock device will stop and the timer will not function properly.
Dust-proofing measures such as a case are essential. However, in the case of a timer that generates an alarm by ringing a bell, there is a problem in that it is difficult to completely cover the bell and the bell striking mechanism with a case or the like to prevent dust.

This idea was devised in view of the above points, and its purpose was to separate the switch, clock device, and bell and bell striking mechanism into units, connect and link them, and create a dust-proof case. The bell striking mechanism is placed outside to improve dustproofing without adversely affecting the sound, the switch is placed inside the case to improve electrical safety, and the bell striking mechanism is particularly simplified. It has been made possible to provide it at a low price. Another purpose of this invention is to have an alarm that can ring a bell at the same time as the switch is activated, or after a desired period of time or after the switch is activated, using an extremely simple configuration. The point is to get a timer.

The embodiment of this invention will be explained below with reference to the drawings. 1 is a main shaft (set shaft) supported by upper and lower mechanisms 2 and 3, 4 is a mainspring mounted on the main shaft 1, and 5 is a main shaft that can be slid on the main shaft 1. The main gear is connected to the clock device 6. 7 is a contact opening/closing cam mounted on the upper end of the main shaft 1, and 8 is a bell striking cam also mounted on the upper end of the main shaft 1.
Cutouts 9 and 10 (FIG. 3) are formed in each. S is the movable contact piece 11 and the fixed contact piece 12 (third
A movable contact piece 11 is linked to the contact opening/closing cam 7 and is turned off when it engages with the notch 9, and the switch S is fixed to the upper mechanism 2. Reference numeral 13 denotes a U-shaped lower cover, which supports the upper and lower mechanisms 2 and 3 that support the clock device 6.
It also serves as the substrate that supports the. 14 is a U-shaped upper cover, the lower part of which is fixed to the lower cover 13, and by overlapping the upper cover 14 and the lower cover 13, it is formed into a box shape (FIG. 4);
The clock device 6 and switch S are covered to provide a dust-proof structure. 15 is a bell fixed to the upper outer side of the upper cover 14, and 16 is the upper cover 1 as well.
One end is rotatably supported on the outside of the 4, and the other end is composed of three parts as shown in Fig. 2, one of which extends into an arm shape 17 and has a hitting ball 18 at the tip.
is fixed, the other one extends in the form of an arm 19, comes into contact with the side surface 20 of the lower cover 13, and has elasticity so as to always bias the entire striking lever 16. An engagement pin 21 (FIGS. 2 and 5) is implanted at one tip of the bell-striking cam 8 through the upper cover 14 and engaged with the notch 10. When the lever 16 hits the bell 1 due to the elasticity of the arm-shaped portion 19,
It is made to look like a single stroke of 5. Reference numeral 22 denotes a mounting plate fixed to the outside of the lower cover 13, through which the timer can be attached to an electric appliance such as a toaster oven. The upper cover 14 and the lower cover 13 are connected by three convex portions 2 formed on the upper cover 14.
3 (Fig. 3) is the hole 2 formed in the lower cover 13.
4, and the tips of the convex portions 23 are bent and fixed.

5 to 9 show the first embodiment of the cam mechanism, FIG. 5 is an exploded perspective view, and FIG. 6 is a view of the contact opening/closing cam 7 from the direction A in FIG. A perspective view, FIG. 7 is a perspective view of the bell-beating cam 8 from the direction B, FIG. 8 is an enlarged plan view showing the bell-beating cam 8 removed, and FIG. 9 is an enlarged plan view. It is. As shown in FIG. 5, a rotating pin 27 is installed in the upper part of the main shaft 1, and a drum-shaped recess 28 is bored into the rotating pin 27 on the lower surface of the contact opening/closing cam 7 shown in FIG. to loosely fit. Therefore, the eighth
As shown in the figure, the contact opening/closing cam 7 is given a free rotation range relative to the rotation pin 27 by an angle α with respect to the rotation direction of the main shaft 1. Further, a fan-shaped convex portion 30 (see FIG. 5) is formed in the upper surface hole 29 of the contact opening/closing cam 7, and a fan-shaped recess 31 (see FIG. ) is loosely fitted, and the width of the fan-shaped recess 31 is equal to the width of the contact opening/closing cam 7.
As shown in FIG. 9, the bell striking cam 8 can freely rotate by an angle β in the rotation direction with respect to the contact opening/closing cam 7. given a range.

FIG. 10 shows a second embodiment of the cam mechanism, in which a rotating piece 32 is fixed to the main shaft 1, and a contact opening/closing cam 7 and a bell striking cam 8 are connected to the rotating piece 32. Penetrating fan-shaped holes 33 formed in each body part
and 34 are loosely fitted to give the contact opening/closing cam 7 and the bell striking cam 8 different free rotation ranges relative to the main shaft 1.

To explain the operation in such a configuration, first, when the main shaft 1 is set in the direction of arrow a for a desired time, the contact opening/closing cam 7 and the bell striking cam 8 rotate and engage the notch 9. The rotary contact piece 11 is pushed up to turn on the switch S, and the notch 1 is
The engagement pin 21 of the striking lever 16 that was engaged with the
is pushed up, the striking lever 16 rotates in the direction of arrow c, and a repulsive force is stored in the arm-shaped portion 19, preparing for the bell striking operation. At the same time, the mainspring 4 is wound, and this repulsive force drives the timepiece device 6, and the main shaft 1 starts moving in the direction of arrow b at a constant rotation. When the set time has elapsed, the movable contact piece 11 quickly drops into the notch 9 of the contact opening/closing cam 7, and the engagement pin 21 of the striking lever 16 quickly drops into the notch 10 of the bell striking cam 8. When this happens, the switch S is turned off, which turns off the heater of a toaster oven, for example, and the hitting lever 16 suddenly rotates in the direction of the arrow d due to the repulsive force of the arm-shaped portion 19, causing the hitting ball 18 to hit the side of the bell 15. This alarm sounds a bell to indicate that the operation has ended, that is, in the case of a toaster oven, that the baking process has ended. Then, the protrusion 25 formed on the lower outer periphery of the contact opening/closing cam 7 comes into contact with a stopper pin 26 implanted in the upper mechanism 2, and the timer stops.

By the way, to further explain the above operation in detail regarding the first embodiment of the cam mechanism, when the main shaft 1 is rotated in the direction of arrow a during setting, the free rotation range angle α (FIG. 8) The rotation pin 28
idly rotates, and then the contact opening/closing cam 7 rotates to turn on the switch S. Subsequently, after waiting for the free rotation range angle β (Fig. 9), the bell striking cam 8 rotates. , the engagement pin 21 is pushed up and the striking lever 16 is ready for the bell striking action. Furthermore, after the set time has elapsed, the contact opening/closing cam 7 is retracted by the self-elasticity of the movable contact piece 11 of the switch S, and the contact opening/closing cam 7 rapidly rotates by the free rotation range angle α. S acts rapidly, and at the same time, the bell-beating cam 8 rapidly rotates by the angle β added to the free rotation range angle α to perform the bell-beating action.

Therefore, the free rotation range of the contact opening/closing cam 7 with respect to the main shaft 1 is only the angle α, but the bell striking cam 8 is given an angle α+β, and for example, the bell striking cam 8 can be struck at the same time as the switch S is turned off. When the bell striking cam 8 has a large free rotation range, it is possible to ensure simultaneous operation even if there are some large variations in dimensions of the striking lever 16, etc. In addition, since the free rotation range of the contact opening/closing cam 7 is made small during setting, the switch S can be turned on within a small setting angle range of the main shaft 1, and the switch S can be turned on reliably even at a small setting angle. The so-called fine angle setting that allows the switch S to be turned on is reduced, and there is a special effect that the timer operation is safe and reliable. Furthermore, after the timer is turned off, the protruding piece 25 of the contact opening/closing cam 7 comes into contact with the stopper pin 26 and the main shaft 1 stops.
By reducing the free rotation range angle α, unnecessary rotation of the main shaft 1 after the switch S is turned off can be reduced. This has the effect of being favorable in terms of the design of the scale display board of the timer.

In the above description of the bell-beating operation, the bell is struck once when the switch S is turned off. By appropriately setting the position and the free rotation range of each cam, the bell sound can be emitted before the switch S is turned off or with a delay after the switch S is turned off. Further, although the bell striking cam 8 has one cutout 10, by providing a plurality of cutouts as appropriate, it is possible to emit a bell sound several times at appropriate intervals while the switch S is on. .

As described above, in the alarm timer of this invention, the striking lever 16 is directly linked to the bell striking cam 8 mounted on the main shaft 1, and the alarm timer is stored in the arm-shaped part 19 of a part of the striking lever 16. Bell 1 due to repulsive force
5, so there is no error in the bell striking action and a reliable alarm can be issued. Also, the bell striking lever 1
One end of the ring 6 is simply constructed of arm-like parts 17 and 19 and an engaging pin 21, and the bell-striking action can be performed using the elasticity of the arm-like part 19, making it an extremely simple structure as a bell-striking mechanism. We can provide inexpensive alarm timers from. In addition, the clock device 6 and the switch S are separate units from the bell striking mechanism, and are housed in a box-like case consisting of a U-shaped upper cover 14 and a lower cover 13, so they have excellent dustproof effects. At the same time, the electrical safety of the switch S is improved, and since the bell striking mechanism is a separate unit from the clock device 6, etc., assembly is simple and productivity is improved. Furthermore, it is possible to obtain an alarm timer with a relatively simple configuration that can ring the bell 15 not only simultaneously with the operation of the switch S, but also ahead of or delayed from the time of the operation of the switch S by a desired length of time. In addition, the fine angle setting of switch S and the main axis 1 after switch S is turned off are possible.
There are various practical effects such as being able to make the operation smaller.

[Brief explanation of the drawing]

The drawing shows an embodiment of this invention.
The figure is a front view with a partial cross section, Figure 2 is a plan view, Figure 3 is an exploded perspective view, Figure 4 is a perspective view of the box, and Figures 5 to 9 are the first implementation of the cam mechanism part. Fig. 5 is an exploded perspective view of the example, Figs. 6 and 7 are perspective views in directions A and B in Fig. 5, Figs. 8 and 9 are explanatory views of the operation, and Fig. 10 is a perspective view of the FIG. 3 is an exploded perspective view showing a second embodiment. 1: Main shaft, 6: Clock device, 7: Contact opening/closing cam, 8: Bell striking cam, 13: Lower cover, 1
4: Upper cover, 16: Hitting lever, 18: Hitting ball, 19: Arm-shaped part, 21: Engagement pin, 27: Rotating pin, 28: Drum-shaped recessed part, 30: Fan-shaped convex part, 31:
Fan-shaped recess, 32: Rotating piece, 33, 34: Fan-shaped hole,
S: Switch.

Claims (1)

[Claims for Utility Model Registration] (1) A U-shaped upper cover and a lower cover are overlapped to form a box body, and inside the box body is a switch and a device for turning the switch on and off. It has a built-in clock device that constantly rotates a main shaft on which a contact opening/closing cam and a bell striking cam are mounted, and a striking lever having an elastic arm-shaped part and a striking ball at one end is mounted on the upper part of the upper cover. At the same time, the engaging pin of the striking lever passes through the upper cover and engages with the bell striking cam, and then a desired time is set using the main shaft and the switch is turned on or off, and when the set time elapses. An alarm timer characterized in that when the switch is subsequently turned off or on, the bell rings at the same time as the switch is turned off or on, or after a predetermined period of time or a delay. (2) A drum-shaped recess is formed on the lower surface of the contact opening/closing cam, and a fan-shaped convex portion is formed on the upper surface, and a fan-shaped recess is formed on the lower surface of the bell-beating cam, and the drum-shaped recess of the contact opening/closing cam is connected to the main axis. At the same time, the fan-shaped concave part of the bell-driving cam is loosely fitted into the fan-shaped convex part of the contact opening/closing cam in an overlapping manner, so that the contact opening/closing cam can freely rotate with respect to the main shaft. The alarm timer according to claim (1) of claim 1, wherein the alarm timer is characterized in that the bell striking cam is given a free rotation range with respect to the contact opening/closing cam. (3) A rotating piece is fixed to the main shaft, and the fan-shaped holes formed in the bodies of the contact opening/closing cam and the bell striking cam are loosely fitted into the rotating piece, respectively, and the contact opening/closing cam and the bell striking cam are loosely fitted into the rotating piece. 2. The alarm timer according to claim 1, wherein the striking cam and the striking cam are each given different free rotation ranges with respect to the main shaft.