JPS635038Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a reference detection device for an analog display type alarm clock.

Conventionally, the guideline detection switch was activated by the falling motion of a cam mechanism using a protrusion and groove provided between detection wheels that corresponded to the hour hand wheel, which rotates once every 12 hours, and the minute hand wheel, which rotates once every hour. The reference device for operating electric sound alarm devices such as buzzers with high precision is
For example, Utility Model Publication No. 46-3263 and JP-A-53-
It is publicly known from Publication No. 118165 and the like. The shape of the conventional detection lever that detects the falling motion of the cam part of the hour and minute detection wheel to operate the switch is generally two-piece, with an arm part for minute detection and an arm part for hour detection. It is formed in a forked shape, and a minute wheel and a minute detection wheel or an hour hand and a minute detection wheel are arranged between the two forked arms, and each wheel and the arm overlap in a planar relationship. In addition, a pipe portion to which a pointer is attached is integrally formed on the hour hand wheel and the minute hand wheel. In addition, devices that detect hours and minutes must be assembled so that the phase relationship between each wheel, such as the hour and minute hand wheel and both detection wheels, is constant. It is necessary to assemble them sequentially in the axial direction of the clock train while maintaining the phase relationship.

Therefore, in the conventional high-accuracy guide device using a detection lever, since the wheel is placed between two pronged arms, it is impossible to assemble each wheel and the detection lever by inserting them from directly above, and moreover, it is time-consuming. - Since the minute wheel has a pipe portion, it is difficult to assemble, and has the disadvantage that it becomes an obstacle especially when performing automatic assembly using an automatic assembly machine. Further, although it is easy to separate the detection lever in order to improve the above-mentioned drawbacks, it is not preferable because the number of components increases and the cost increases.

Therefore, the present invention proposes a reference detection device for an alarm clock that solves the above-mentioned drawbacks.

In order to achieve the above object, the present invention detects that the phases of the cam mechanism are matched by the protrusions and grooves provided between the detection wheels corresponding to the hour hand wheel and the minute hand wheel. In the reference device for performing this, the hour detection wheel, the hour hand wheel, the minute detection wheel, and the minute hand wheel are arranged in this order on the lower case, and the hour detection wheel is placed between the lower case and the hour detection wheel. A movable contact piece is arranged so as to be biased toward the hour hand wheel side and is capable of coming into contact with and separating from the fixed contact piece, and a hole portion through which the minute hand wheel can pass from above is provided between the hour hand wheel and the minute detection wheel. The movable contact piece has an engaging part that can be engaged from above, and a detection lever that the detection wheel abuts from above is arranged, and the detection lever can be incorporated into the lower case from above and is swingable. The present invention is characterized in that a supporting portion is formed to support the components, thereby allowing each component to be inserted and assembled from above.

The embodiments shown in the drawings will be described below.

The case 1 is molded from a plastic material, and has a boss 1a having a screw hole at its left end, and holes for rotatably supporting an hour wheel 12 and a minute indicator wheel 20, which will be described later, on the lower surface, as well as a hole for rotatably supporting a day wheel 11. A shaft 1b that rotatably supports the reference setting wheel 18, and two support portions 1d having U grooves that rotatably support the detection lever 22 are formed. The middle plate 2 is also molded from a plastic material, and has a hole that rotatably supports an intermediate shaft 7, which will be described later, a shaft 2a that rotatably supports the day wheel 11, a shaft 2b that rotatably supports the minute indicator wheel 20, and a minute hand wheel. a boss 2c that rotatably supports the second hand wheel 9 and has a hole in the center through which the second hand wheel shaft 6 passes;
A boss 2d that rotatably supports the detection lever 22 together with the support portion 1d of the case, and a hole through which the shaft of the reference setting wheel 18 passes are formed. Reference numeral 3 denotes a cover, which is also made of plastic material, and has holes for rotatably supporting the intermediate shaft 7, the shaft 6 of the second hand wheel, and the shaft of the reference setting wheel 18. And the above middle plate 2
The cover 3 is placed on the boss 1a of the case, and each is fixed with a screw 4.

Next, the configuration of the gear train for time display will be explained.

The second hand wheel 5 is integrally formed with a pinion 5a,
It is fixed to a shaft 6, and this shaft 6 is rotatably supported by the cover 3, and the other end is rotatably supported while passing through the pipe 9b of the minute hand wheel, and the second hand 1 is attached to the tip of the shaft 6.
4 is installed. The second hand wheel 5 is driven by a motor (not shown). The intermediate shaft 7 is
A pinion 7a that meshes with the minute wheel 9, a groove 7b that rotatably supports the intermediate wheel 8 that meshes with the pinion 5a of the second hand wheel, and a knob 7c that penetrates the cover 3 and adjusts the time are integrally formed, and the intermediate plate 2 and is rotatably supported by the cover 3. Further, the intermediate wheel 8 is connected to the intermediate shaft 7.
They are slip-coupled in a known manner so as to rotate with a slip torque determined for the shaft. The minute wheel 9 that meshes with the pinion 7a of the intermediate shaft includes a pinion 9a, a pipe 9b, and a cam groove 9c to be described later.
The upper end of the pipe 9b is rotatably supported by a boss 2c on the middle plate, and the other end is rotatably supported by a pipe 12a of an hour wheel, which will be described later, passing through this, and a minute hand 10 is attached to its tip. . The hour wheel 11 that meshes with the pinion 9a of the minute wheel is integrally formed with the pinion 11a,
It is rotatably supported by a shaft 1b of the case and a shaft 2a of the middle plate. Hour wheel 12 meshing with the pinion 11a
A pipe 12a and a cam groove 12b, which will be described later, are integrally formed, and the inner diameter of the pipe 12a rotatably supports the pipe 9b of the minute hand wheel, and the outer diameter rotatably supports the pipe 9b of the minute hand wheel, and the hour hand is attached to the tip of the pipe 12a. 13
is installed.

Next, the gear train of the guide mechanism will be explained.

The minute detection wheel 16 is integrally formed with a protrusion 16a, which will be described later, and its center is rotatably supported by a pipe 9b of the minute wheel, and is disposed between the minute wheel 9 and the hour wheel 12. In addition, the hour detection wheel 17 is a protrusion 1 which will be described later.
It is formed integrally with the hour hand wheel 7a and is disposed below the hour hand wheel 12, and its center is rotatably supported by the hour hand wheel's pipe 12a. 18 is the standard set car, minute detection car 1
6, a gear 18a that meshes with a minute indication wheel 20, which will be described later, and a pinion 1 that meshes with an hour detection wheel 17.
8b and a knob 18c for setting the reference time is integrally formed at the tip passing through the middle plate 2 and the cover 3, and is rotatably supported by the shaft 1c of the case and a hole in the cover 3. Gear 18 of the guideline setting wheel above
The minute indicator wheel 20 that meshes with the hour indicator wheel 20 has a minute reference time mark 20a (for example, 00, 05,...55) displayed, and has an intermittent tooth 20b that meshes with the hour indicator wheel 21 and performs intermittent transmission. gear 20c
The marks 2
0a is configured to be click-stopped at a predetermined position. Further, the hour indication wheel 21 displays indication time marks (for example, 1, 2, . . . 12) in units of hours, and is rotated intermittently by the intermittent teeth 20b of the minute indication wheel. Next, the structure of the detection switch for detecting the reference time will be explained. The aforementioned minute wheel 9 is formed with a cam groove 9c, and the minute detection wheel 16 is provided with a protrusion 16a corresponding to the cam groove 9c.
c and the protrusion 16a match in phase, and the minute detection wheel 16 becomes movable in the axial direction. Similarly, a cam groove 12b is formed on the hour wheel 12, and a protrusion 17a is formed on the hour detection wheel 17 to correspond to the cam groove 12b.
is established, and for a specified period of time only once every 12 hours.
Two sets of cam mechanisms, well known as a guideline detection device, are constructed so that the phases of the cam groove 12b and the protrusion 17a match and the hour detection wheel 17 can move in the axial direction. cam groove 9
The relationship between c and 12b and the protrusions 16a and 17a of both detection wheels is as shown in FIG. A detection lever 22 that detects the axial movement of the minute detection wheel 16
is arranged between the minute detection wheel 16 and the hour wheel 12,
It is rotatably supported by the support part 1d of the case and the boss 2d of the middle plate, and has a pressing part 22a at one end that contacts a movable contact piece 23, which will be described later, and a pusher part 22a, which will be described later, which engages with a pin 25a of a squealing lever, which will be described later. , and a pin 22b that restricts the movement of the detection lever 22 are integrally formed.
The movable contact piece 23 is made of an elastic conductive material,
The hour indicator wheel 17 and the detection lever 2 are arranged between the hour indicator wheel 17 and the case 1, and the movable contact piece 23 connects the hour indicator wheel 17 and the detection lever 2.
Spring sliding properties are provided so as to move the minute detection wheel 16 upward through the minute detection wheel 1, and both detection wheels 1
6 and 17 have a contact portion 23a that comes into contact with a fixed contact piece 24 made of a conductive material to constitute a switch when moved in the vertical direction. Also, the fixed contact piece 24
is the click gear 20 of the minute indicator wheel mentioned above.
A click piece 24a that engages with c and performs a click action.
are integrally formed. Furthermore, when the cam groove 12b of the hour hand wheel and the protrusion 17a of the hour detection wheel do not match in phase, the spring force of the movable contact piece 23 is applied to the detection lever 2.
The amount of movement of the hour detecting wheel 17 and the minute detecting wheel 16 is set so that they do not act on the minute detecting wheel 16 through 2. Therefore, in normal times, the rotational load torque of the minute wheel 9 does not increase due to the cam action between the protrusion 16a of the minute detection wheel and the cam groove 9c of the minute wheel. On the other hand, the anti-squeal lever 25 is supported by the case 1 so as to be linearly movable, and has a pin 25a that engages with the pin 22b of the detection lever. The detection lever 22 can be operated in two positions, including the ON position, where the detection lever 22 does not match, and the detection lever 22 is prevented from rotating in the OFF position. In addition, the alarm circuit for operating the electric sound alarm device includes a movable contact piece 2
3 and a fixed contact piece 24, a power source E, and a buzzer B are connected in series.

In the above configuration, the assembly method is first case 1.
Assemble the switch parts of the movable contact piece 23 and the fixed contact piece 24, the chirp lever 25, the minute indicator wheel 20, and the hour indicator wheel 21. Next, assemble the wheels 17 and 12 so that the protrusion 17a of the hour detection wheel and the cam groove 12b of the hour hand wheel have a predetermined phase relationship, place the detection lever 22 thereon, and then set the hour detection wheel 17 and the hour hand as described above. Assemble the reference set wheel 18 and the minute detection wheel 16 so as not to change the phase of the wheel 12, assemble the minute wheel 9 so that the protrusion 16a of the minute detection wheel and the cam groove 9c of the minute wheel have a predetermined phase relationship, and then assemble the minute wheel 9 as described above. In order not to change the phase relationship of both the hour and minute, the hinoura wheel 11 and the middle plate 2
The lower wheel train is assembled by assembling. Then, an upper wheel train consisting of the second hand wheel 5, the intermediate wheel 8, a motor train (not shown), and the cover 3 is assembled. Furthermore, after turning the knob 18c on the guide set car to set the guide time marks on both guide display cars 20 and 21 to, for example, 12:00, turn the knob 7c on the intermediate shaft.
It is installed so that the hour hand 13 and minute hand 10 indicate 12:00 when the buzzer B starts sounding by turning the dial. Therefore, the parts inside the case are simply assembled by stacking them one after the other from above, which makes assembly easy and advantageous when assembled using an automatic assembly machine. The operation of the device constructed in this way will be explained below. First, set car knob 1 as a guide.
When 8c is rotated, the guide setting wheel gear 18a
The minute indicator wheel 20 is rotated, and the indicator time mark 20a on the indicator wheel changes sequentially in accordance with the click operation, and the indicator time mark 20a changes from 55 minutes to 55 minutes.
When changing to 00 minutes or from 00 to 55 minutes, the hour indication wheel 21 is activated by the intermittent teeth 20b of the minute indication wheel.
By turning by one-twelfth of a turn, the reference time mark on the hour reference display wheel 21 can be changed by one hour. In this manner, the user changes the reference time mark to set the desired reference time. On the other hand, the gear 18a of the reference setting wheel is engaged with the minute detection wheel 16, and the pinion 18b of the reference setting wheel is engaged with the hour detection wheel 17.
Therefore, when the knob 18c is turned, both detection wheels 16 and 17 are also changed.
Accordingly, with the setting of the reference time, the phases of the minute detection wheel protrusion 16a and the hour detection wheel protrusion 17a are determined. Next, the user operates the sound stop lever 25 in the ON direction so that the pin 22b of the detection lever and the pin 25a of the sound stop lever are disengaged.
At this time, the cam groove 9c of the minute hand wheel and the protrusion 1 of the minute detection wheel
6a and the cam groove 12b of the hour hand wheel and the protrusion 17a of the hour detection wheel are not in phase with each other. Contact is broken and buzzer B does not operate.

When the clock is set in this state, the gear train for the time display of the clock is driven by a motor, and the minute hand wheel 9 rotates once every hour, and the hour hand wheel 12 rotates once every 12 hours. At the same time, the cam groove 9c of the minute hand wheel and the cam groove 12b of the hour hand wheel also rotate at the same time. At this time, the minute hand wheel 9 and the hour hand wheel 12 rotate while contacting the detection wheels 16 and 17, respectively, so both detection wheels 16 and 17 receive rotational force, but this rotational force is applied to the click gear 20c of the minute indication wheel. Since it is held by the click spring 24a that acts on the
Both detection wheels 16 and 17 continue to stop at the set phase. While the minute wheel 9 is rotating, the cam groove 9c of the minute wheel and the protrusion 16a of the minute detection wheel match once every hour, and the minute detection wheel 16 is in a state where it can move upward. However, since the phases of the cam groove 12b of the hour hand wheel and the protrusion 17a of the hour detection wheel do not match, the movable contact piece 23 is pressed by the hour detection wheel 17, and the spring force of the movable contact piece 23 is applied to the detection lever 22. The movable contact piece 23 and the fixed contact piece 24 do not come into contact with each other.

Then, as time passes further, the phases of the cam groove 12b of the hour hand wheel and the protrusion 17a of the hour detection wheel first match, and the hour detection wheel 17 becomes able to move upward, but the cam groove 9c of the minute wheel and minute detection wheel protrusion 1
Since the phases of 6a do not match, the detection lever 22
The movable contact piece 23 is held down by the movable contact piece 2
3 and the fixed contact piece 24 do not contact each other. If time continues to pass with the cam groove 12b of the hour hand wheel and the protrusion 16a of the hour detection wheel in phase, the cam groove 12b of the minute wheel 9
c and the phase of the protrusion 16a of the minute detection wheel match. As a result, the phases of the two sets of cam mechanisms match, and the spring force of the movable contact piece 23 causes the hour detection wheel 17 to move upward, and the pushing part 22a of the detection lever is pushed by the movable contact piece 23, causing the second cam mechanism to move upward. In FIG. 3, the detection lever 22 rotates clockwise to move the minute detection wheel 16 upward, and the movable contact piece 23 and the fixed contact piece 24 come into contact. Therefore, since the path of the alarm circuit is made conductive, a current flows through the buzzer B and an alarm sound is emitted. The buzzer B continues to sound while the cam groove 9c of the minute hand wheel and the protrusion 16a of the minute detection wheel are in phase.
During this time, when the user operates the sound stop lever 25 in the OFF direction, the pin 25a of the sound stop lever and the pin 22b of the detection lever engage, and the detection lever 2
2 to the left, and press the detection lever pusher part 22.
Push down the movable contact piece 23 with a to break the contact between the movable contact piece 23 and the fixed contact piece 24, and the buzzer B will stop sounding.
This state continues when the sound stop lever 25 is in the OFF position. In addition, if the cam groove 9c of the minute wheel does not turn off, when the minute wheel 9 rotates as time passes from the state where the phase of the protrusion 16a of the minute detection wheel matches the cam groove 9c of the minute wheel, the slope formed in the cam groove 9c The minute detection wheel 16 is pushed down by the protrusion 16a, and as a result, the detection lever 2 in FIG.
2 to the left, and press the detection lever pusher part 22.
At step a, the movable contact piece 23 is pushed down to break the contact between the movable contact piece 23 and the fixed contact piece 24, and the buzzer B stops sounding. The time period during which the buzzer B continues to sound can be freely set, usually within 30 minutes, by selecting the length of the cam groove 9c of the minute hand wheel at the time of design.
Furthermore, the length of the cam groove 12b of the hour hand wheel is the same as that of the buzzer B.
A sufficient margin is provided for the ringing time in consideration of manufacturing errors of each part and backlash due to clearance, etc., and while the cam groove 12b of the hour hand wheel and the protrusion 17a of the hour detection wheel are engaged, the cam of the minute hand wheel is The fitting between the groove 9c and the projection 16a of the minute detection wheel starts and ends.

Next, the operation of the minute hand 10 and hour hand 13 during correction will be explained.

First, when the knob 7c on the intermediate shaft is turned to the right or left, the minute wheel 9 is rotated by the pinion 7a. This rotation is transmitted to the hour hand wheel 12 via the hour hand wheel 11 in the same way as when driven by a motor. On the other hand, the intermediate wheel 8 which is slip-coupled to the intermediate shaft 7 engages with the pinion 5a of the second hand wheel and attempts to rotate the second hand wheel 5, but the force of the motor connected to the second hand wheel 5 causes the slip of the slip coupling portion to slip. Since the torque is greater than that, the intermediate wheel 8 second hand wheel 5 cannot be rotated. By turning the knob 7c in this manner, the user can arbitrarily set the time.

In the embodiment of the present invention, the indicator device is turned on and off using a sounding lever that can be operated in two positions, engaging and disengaging from the detection lever, but an open/close switch that can be operated from the outside is provided in the alarm circuit. You can.

As described above, according to the present invention, the above-mentioned drawbacks are improved, and the gear parts of the time display and reference mechanism, the detection switch parts, etc. can be assembled by simply stacking them, without reducing the accuracy of the reference time. Therefore, the phase alignment of each gear becomes easy, and a reference device with a simple structure and excellent assemblability is provided.

[Brief description of the drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a plan view, Figs. 2 and 3 are cross-sectional views of Fig. 1, and Fig. 4 is an operational diagram of the minute detection wheel and hour detection wheel. . 9... Minute wheel, 12... Hour hand wheel, 16... Minute detection wheel, 17... Hour detection wheel, 18... Reference set wheel, 22... Detection lever, 23... Movable contact piece, 2
4...Fixed contact piece.

Claims (1)

[Scope of Claim for Utility Model Registration] An hour hand wheel 12, a time detection wheel 17 provided coaxially with the hour hand wheel, a protrusion 17a provided on one of the hour hand wheel and the time detection wheel, and a protrusion 17a provided on the other. a first cam mechanism with a groove 12b, a minute wheel 9 provided coaxially with the hour hand wheel, a minute detection wheel 16 provided coaxially with the minute wheel, and a first cam mechanism with a groove 12b provided therein; Protrusion 16a provided on one side
and a second cam mechanism formed by a groove 9c provided on the other side, and detects that the phases of the protrusions and grooves of the two cam mechanisms match and makes a time signal, etc., on the lower case 1. , the above hour detection wheel, the above hour hand wheel,
The minute detection wheel and the minute hand wheel are arranged in this order, and between the lower case and the hour detection wheel there is a fixed contact piece 24 which is elastic and has a fixed contact piece 24 so as to bias the hour detection wheel toward the hour wheel. A movable contact piece 23 that can be moved toward and away from the hour hand wheel is disposed between the hour hand wheel and the minute detection wheel, and the minute hand wheel can engage with the hole portion through which the minute hand wheel can pass from above and the movable contact piece from above. A detection lever 22 having an engaging portion 22a and to which the detection wheel abuts from above is disposed, and the lower case includes a support portion 1 that allows the detection lever to be incorporated from above and is swingably supported.
d is formed, and when the phases of the first cam mechanism match, the operation of the movable contact piece is regulated by the engaging part of the detection lever, and in this state, when the second cam mechanism matches. A timepiece indicator device, characterized in that it is configured to release the restriction on the movable contact piece.