JPS6227902Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a clock such as a wall clock or table clock.

Conventionally, in a watch in which the coil and rotor of a motor for driving clock hands are separately assembled into a case, the lead wire of the coil winding is soldered to a printed circuit board of a circuit block for driving the motor. As a result, failures such as wire breakage may occur due to vibrations, etc., and the need for soldering makes assembly difficult.

The purpose of this invention is to provide a timepiece that is free from the problem of wire breakage in the connection system between the coil and the circuit block and is easy to assemble.

In the clock of this invention, a U-shaped coil connection terminal is arranged on the end face of the coil of the coil block, and is held by being clamped by an end plate. A pair of opposing pieces of the coil connection terminal are pressed into contact with opposing surfaces of the watch case and the printed circuit board of the motor drive coil block, respectively.

In this way, since the coil and the printed circuit board are connected by pressing the coil connection terminal to the printed circuit board, unlike the case where, for example, the lead wire of the coil winding is soldered to the printed circuit board, it is possible to connect the coil and the printed circuit board by pressing the coil connection terminal to the printed circuit board. Also, there are no problems such as wire breakage. Furthermore, since it is formed as a coil block with coil connection terminals, there is no need for soldering when assembling it into a watch case, and the assembly work is excellent in workability. Furthermore, since the coil connecting terminal is U-shaped and its opposing piece is sandwiched between the printed circuit board and the case, the contact pressure between the opposing piece and the printed circuit board is stabilized. Further, since the coil connecting terminal passes through the iron core and is inserted between the opposing piece thereof, the end plate passing through the iron core, and the end face of the coil, it is easy to attach the coil connecting terminal to the coil block.

An embodiment of this invention is shown in FIGS. 1 to 19. In FIGS. 1 to 3, 1 is a back case of the main body, and 2 is a front case of the main body. A dial 3 and a solar cell 4 are attached to the surface of the back case 1 of the main body. The dial plate 3 is positioned with respect to the main body back case 1 by a positioning dowel 5. Main body case 2
A transparent front cover 6 is fitted in the center, and light receiving windows 7 are provided at the corners to expose the solar cells 4. The main body front case 2 has a screw boss 8 on the back side.
and the main body back case 1 are connected. At this time, the case fixing protrusion 10 of the main body front case 2 fits into the case fixing recess 11 of the main body back case 1. A slit 12 provided along the case fixing protrusion 10 on the back case 1 of the main body allows the case fixing protrusion 10 to be inserted into the case when combined.
This is to give elasticity to. A movement 13 is fitted in the center of the back surface of the main body back case 1, and a battery cover 14 for a secondary battery is provided below the movement 13, and a wall hanging hole 15 is provided above. A minute hand shaft 1 protrudes from the movement 13 onto the surface of the dial 3.
6 (FIGS. 3 and 12), a minute hand 18 is attached via a minute hand bushing 17 that serves as the shaft head. The base of the hour hand 19 is located below the minute hand bush 17. The minute hand bushing 17 protrudes slightly from the surface of the minute hand 18, and the inner surface of the front cover 6 is thinner at the center and thinner toward the outer periphery so that there is sufficient clearance between the minute hand bushing 17 and the inside of the front cover 6. It has a spherical concave curved surface that becomes thicker. The outer surface of the front cover 6 is formed into a flat surface.

Since the inner surface of the front cover 6 is made into a concave curved surface in this way, the front cover 6 can be brought close to the dial 3 without hitting the minute hand bush 17, and the thickness of the entire timepiece can be reduced. Further, since the entire inner surface of the front cover 6 is formed into a concave curved surface, there is no problem of pressing the minute hand 18 even if it bends inward to some extent. Furthermore, since the outer peripheral portion of the front cover 6 is gradually thickened, even if the central portion is thin, the front cover 6 will not lack strength. Furthermore, if the inner surface of the front cover is far away from the dial as in the conventional case, the minute hand may move back and forth, but in this embodiment, the minute hand 18 is
Since it is regulated by the thickened outer periphery, there is no problem of it moving back and forth.

The movement 13 will be explained. This movement 13 is activated by a signal from a crystal oscillator.
It is equipped with a step motor that rotates half a revolution every second, and is constructed as shown in FIGS. 4 to 17. That is, as shown in FIGS. 4 and 6, the iron core 22 constituting the step motor 21
(Fig. 6, Fig. 8) is formed into a substantially annular shape, and magnetic poles 22 are formed at both ends of this iron core 22 and surround the rotor 23.
a, 22b, and magnetic poles 22a, 2 of the iron core 22.
A motor coil 28 is wound around the parts other than 2b, a gear mechanism 24 and a circuit block 25 are arranged in the space inside the iron core 22, and these are housed between an upper case 26 and a lower case 27. iron core 2
2 is made of a magnetic material such as permalloy or an electromagnetic soft iron rod. One magnetic pole 22a of the iron core 22 is formed by an extended portion having the same curvature as the intermediate portion, and the other magnetic pole 22b is formed by being bent in a V-shape. The distances A, B, and C (FIG. 8) between the rotor 23 and each part of the magnetic poles 22a, 22b are such that A<B<C. The coil 28 is connected to the upper and lower cases 26 and 27.
It is installed in a receiving groove 29 with a substantially semicircular cross section provided therein. The rotor 23 is a shaft body 30 (Fig. 7)
The shaft body 30 has both ends attached to the lower case 27.
The upper case 26 is rotatably supported by a hole 23' and a pin 23' of the upper case 26. In addition, the shaft body 3 of the rotor 23
0 is provided with an output gear 30a. The rotor 23 has a cross section passing through the axis as shown in Fig. 8 (broken line l).
It has two poles so that the magnetic poles are different on both sides. The gear mechanism 24 includes a second wheel 31 that meshes with the output gear 30a of the rotor 23, a minute wheel 18', and the like. The second wheel 31 is attached to a boss 31' of the upper case 26. In FIG. 5, 32 is a needle turning knob.

The circuit block 25 drives the motor 21, is provided on a printed circuit board 33 (FIG. 5), and has a circuit configuration as shown in FIG. 14. That is, 34 is an inverter, 35 is a crystal resonator,
36 is a capacitor, 37 is a trimmer capacitor, 3
8 is a frequency dividing circuit, 39 is a waveform shaping circuit, and 40 is a drive circuit. Output terminals 41a, 4 of drive circuit 40
1b is connected to the connection terminal 64 of the coil 28. The inverter 34, the frequency dividing circuit 38, the waveform shaping circuit 39, and the drive circuit 40 are composed of one-chip integrated circuits (hereinafter referred to as chip ICs). The power supply voltage of the circuit block 25 is the solar cell 4.
(Figure 1) from a secondary battery that is charged. To explain the printed circuit board 33, the outer circumferential shape is formed into a substantially circular shape smaller than the motor coil 28, and a circular cutout 33a is provided inside so that the output gear 23 and the second wheel 31 do not come into contact with each other. Resin flow prevention frame 42 to prevent resin sealing the chip IC (not shown) from flowing.
(FIG. 5) is constructed on a chip IC on a printed circuit board 33, and the chip IC is sealed. A trimmer capacitor 37 and a crystal oscillator 35 are then placed above it. Note that a positioning notch is provided in the resin flow prevention frame 42 to position the trimmer capacitor 37 and the crystal resonator 35. Furthermore, a reset terminal 43 is arranged on the printed circuit board 33,
By pressing the reset button 44, the reset terminal 43 comes into contact with the pattern on the printed circuit board 33, and the second count is reset. The reset button 44 is located in the hole 4 of the lower case 27.
It is inserted into 5. 36' is a capacitor, 3
6″ is a terminal.

The rotor 23 of the motor 21 rotates 1/2 at intervals of 30 seconds. If the reduction ratio from the rotor 23 to the minute wheel 31 is set to 1/60, the minute wheel 31 will rotate 1/120 times in 30 seconds. The minute wheel 31 is press-fitted into the center of the minute hand shaft 16 passing through the upper case 26, as shown in FIGS. 4, 7, and 12.
The minute hand shaft 16 is loosely fitted into the hole 46 of the upper case 26, and a minute hand bush 17 is press-fitted into one end of the minute hand shaft 16. A needle turning knob 32 is press-fitted to the other end of the minute hand shaft 16. Upper case 2
A fixed gear 47 having 11 teeth is integrally formed on the surface of the
figure). 48 is an internal gear integrally provided on the back side of the base of the hour hand 19, and has 12 teeth. Reference numeral 49 designates an eccentric cam that is provided integrally with the minute hand bush 17, and is fitted into a center hole 50 (FIGS. 12 and 13) provided at the base of the hour hand 19. The minute hand 18 has a notch 18a and is loosely connected to a protrusion 17a of the minute hand bushing 17.

When assembling the upper and lower movement cases 26 and 27, insert the coil 28 into the lower case 27,
The rotor 23, minute wheel 31, and second wheel 31 are inserted, and then the printed circuit board 33 is assembled by aligning the positioning hole 52 with the positioning boss 51 (FIG. 4) of the lower case 27. Then, the upper case 26 is stacked on the lower case 27 so that the anti-rotation protrusion 53 (FIG. 5) on the periphery of the upper case 26 fits into the anti-rotation recess 54 (FIG. 4) of the lower case 27. After that, the screw 56 inserted through the hole 54 of the upper case 26 and the hole 55 of the printed circuit board 33 is inserted into the screw hole 57 of the lower case 27.
Screw into. Furthermore, other holes 58 of the upper case 26
Screw the screw 59 inserted into the hole 60 of the lower case 27.

10 and 11 are detailed views of the connection terminal portion of the motor coil 28. In the figure, 61 is a disk-shaped coil end plate, and the core insertion hole 6
2 and a terminal insertion slit 63. 64
is a coil connection terminal, which is formed into a substantially U-shape. The coil connection terminal 64 has two contacts 65,
66 at the tip and a terminal piece 67 at the base. The end of the winding of the coil 28 is soldered to the terminal piece 67. 68 is an iron core insertion hole.
These coil connection terminals 64 and coil end plates 61 are connected to the motor coil 2 as shown in FIG.
8 and is assembled into the iron core 22 in contact with the end portion of the iron core 22. Then, the motor coil 28 is assembled into the lower case 27,
By incorporating the printed circuit board 33 of the circuit block 25, the contacts 65 press against the printed circuit board 33, and the coil connection terminals 64 and the circuit block 25 are connected. Further, the contact 66 is pressed against the lower case 27. Therefore, the coil connecting terminal 64 is clamped from above and below, the forces are balanced, the coil end plate 61 is positioned, and the contact pressure is maintained constant.

In this way, since the motor coil 28 and the printed circuit board 33 are connected by pressing the coil connection terminal 64 to the printed circuit board 33, unlike the case where the lead wire of the coil winding is soldered to the printed circuit board, for example, Failures such as wire breakage do not occur even due to vibrations, etc. Moreover, since it is formed as a coil block with a coil connection terminal 64, there is no need for soldering when assembling it to the movement case, and the workability of the assembly work is excellent. Furthermore, since the coil connecting terminal 64 is U-shaped and is sandwiched between the printed circuit board 33 and the case 27, the contact pressure is stabilized as described above. Further, the coil connection terminal 64 passes through the iron core 22, and the opposing piece and the end plate 61 and the motor coil 28 pass through the iron core 22.
Since it is sandwiched between the end face of the coil connecting terminal 6
Installation to the coil block 4 is also easy.

FIGS. 9A and 9B show the electrode 22 of the motor coil 28.
Fig. 3 shows the positioning means for a and 22b. That is, a generally fan-shaped fall prevention protrusion 70 having a loose fitting hole 69 for the rotor 23, protrusions 71 and 72 parallel to both sides of the fall prevention protrusion 70, and a Opposing protrusions 73 are provided on the lower case 27, and these toppling prevention protrusions 70 and each of the protrusions 71 to 73
The electrode 22 of the iron core 22 is placed in the groove formed between the
a and 22b are inserted. The fall prevention protrusion 70 prevents the rotor 23 from falling during assembly.
The loose fitting hole 69 is formed into a circular hole that is slightly larger than the rotor 23. On the other hand, the upper case 26 has an iron core 22
a pressing protrusion 74 facing the electrodes 22a, 22b;
75 is provided, and by attaching the upper case 26 to the lower case 27, the electrodes 22a and 22b are held down by the holding projections 74 and 75.

The operation of the movement 13 will be explained. An output waveform as shown in FIG. 15 is applied from the circuit block 25 to the coil 28 of the motor 21, and current flows alternately at 30 second intervals. Therefore, the magnetic poles 22a and 22b at both ends of the iron core 22 are alternately magnetized.
On the other hand, the rotor 23 is magnetized into two poles as described above, and the distance between the magnetic poles 22a and 22b is A<
Since B<C, the rotor 23 is oriented in a magnetically balanced direction (in the direction of arrow P in FIG. 8). Therefore, as the magnetic poles 22a and 22b are alternately magnetized as described above, the rotor 23 rotates in one direction (the direction of arrow M in FIG. 8). The rotation of the rotor 23 is transmitted to the second wheel 31' and the minute hand wheel 18', and the rotation of the minute hand wheel 18' is transmitted to the minute hand bush 17 press-fitted into the minute hand shaft 16, thereby displaying the minutes. The minute hand bush 17 is connected via an eccentric cam 49.
An internal gear 48 integrated with the hour hand 19 is driven. Since the internal gear 48 meshes with a fixed gear 47 that is integrated with the upper case 26, one of the eccentric cams 49
In other words, one revolution of the minute hand 18 causes the hour hand 19 to rotate 1/12 of a revolution, and the hour can be displayed.

Distance A between the electrodes 22a, 22b and the rotor 23,
B and C have a large influence on the characteristics of the motor 21, but the electrodes 22a and 22b are fitted between the anti-falling protrusion 70 and each of the protrusions 71 to 73, so that their positions can be fixed in the lateral direction. The position is fixed in the vertical direction by being held down by the holding projections 74 and 75 of the upper case 26. Therefore,
Variations in the characteristics of the motor 21 are reduced. Moreover, in this way, the electrode 22 is placed between each of the protrusions 70 to 73.
Since the parts a and 22b are fitted, there is no need to worry about positioning during assembly, making assembly easier. Also,
By providing the fall prevention protrusion 70,
Assembling the rotor 23 becomes easier.

The time is set by forcibly turning the hand turning knob 32, which is integrated with the minute hand wheel 18' and the minute hand shaft 16, from the outside. At this time, the rotor 23 is also rotated, but there is no particular adverse effect. Note that the hand turning knob 32 is housed in a recess 32' of the lower movement case 27 and is flush with the surface of the lower case 27, but because of the radial unevenness of the surface, it can be easily turned with a fingertip. . Since the needle turning knob 32 is housed in the recess 32' in this way,
Can be made thinner.

The hour and minute hands 18 and 19 are driven in this way, but the shape of the iron core 22, that is, the coil 28
Since the shape is approximately circular, the effective coil length becomes longer and the finished coil diameter can be reduced. Therefore,
The thickness of the movement 13 can be reduced accordingly. In addition, a gear mechanism 2 is provided inside the coil 28.
4 and the circuit block 25, the movement 13 can be made smaller.

The attachment of the movement 13 to the back case 1 of the main body will be explained. Locking protrusions 77 are provided at three locations on the inner periphery of the movement fitting hole 76 (FIG. 16) on the back case 1 of the main body, and engagement recesses 78 into which each of the locking protrusions 77 engages are provided on the upper movement case 26. It is being The engagement recess 78 is formed in the shape of a groove in which the locking projection 77 can slide in the circumferential direction of the movement, and has an insertion notch 79 into which the locking projection 77 is inserted.
have. In addition, an elastic locking beam 80 is provided at one location in the circumferential direction of the movement insertion hole 76 on the back case 1 of the main body.
A V-shaped detent projection 81 is provided at the center of the elastic locking beam 80. The elastic locking beam 80 is integrally formed with the main body back case 1, and is formed in the shape of a beam fixed at both ends. On the other hand, the upper movement case 26 has an elastic locking beam 8.
Two engaging notches 82 and 83 (FIG. 17) that can be engaged with the rotation stopper projection 81 of 0 are formed slightly apart from each other in the circumferential direction.

When installing the movement 13,
First, the first engaging notch 8 of the movement 13 is inserted into the detent protrusion 81 of the elastic locking beam 80 on the back case 1 of the main body.
Match 2. As a result, the insertion notch 79 of the locking recess 78 of the movement 13 and the main body back case 1
The circumferential position of the locking protrusion 77 coincides with that of the locking protrusion 77 . In this state, the movement 13 is pushed into the movement insertion hole 76 of the main body back case 1, and the locking protrusion 77 is inserted into the engagement recess 78 from the insertion notch 79. Then, the movement 13 is rotated in the direction of arrow N in FIG. As a result, the elastic engagement beam 80 is deflected as shown by the chain line in FIG. 17, and the detent projection 83 moves from the first engagement notch 82 to the second engagement notch 83. Further, each locking protrusion 77 engages with an engagement recess 78 . The installation is completed in this way, but since the thickness of the locking protrusion 77 and the width of the engagement recess 78 are approximately the same, the movement 13 is fixed without moving up and down. Furthermore, the movement 13 is prevented from rotating by engaging the rotation prevention protrusion 81 with the second engagement notch 83.

When assembling the watch body, after fixing the movement 13 to the back case 1 of the watch body, position the dial 3 with the positioning dowel 5 (Fig. 1), and set the hour hand 1.
9. Attach the minute hand 18 and minute hand bushing 17, and connect the main body front case 2 and the main body back case 1. Then, the main body front case 2 and the main body back case 1 are completely connected using four screws 9. A secondary battery (not shown) is housed in the back case 1 of the main body and held by the battery cover 14. The solar cell 4 is fixed to the back case 1 of the main body with double-sided tape or the like.

I will explain the hanging tool for hanging the clock on the wall.
Figure 2, Figure 18, and Figure 1 are shown on the back case 1 of the main unit.
As shown in FIG. 9, a wall-hanging hole 15 is provided, and the device is hung on a wall 85 (FIG. 3) in the room via a hanging tool 84 that engages with this wall-hanging hole 15. The hanging tool 84 is formed in the shape of a two-stage stepped disc, and has a central hole 86.
It is fixed to the wall 85 with wood screws 87 inserted into the wall 85. The thickness t ₁ of the small diameter portion 84 a of the hanging tool 84 is approximately the same as the thickness s ₁ of the back surface portion of the main body back case 1 . The thickness t ₁ of the large diameter portion 84b is approximately the same thickness as the gap s ₂ between the main body back case 1 and the main body front case 2. The wall hanging hole 15 is a small diameter semicircular hole 1
5a and a large diameter semicircular hole 15b are vertically connected. The inner diameter d of the small diameter semicircular hole portion 15a is larger than the outer diameter _D2 of the large diameter portion 84b of the hanging tool 84. Further, the wall hanging hole 84 has a notch 88 extending upward, and the hanging tool 84 has two points 88a at the entrance of the notch 88 at the small diameter part 84a.
engage with.

In this way, since the watch body is hung via the hanger 84, there is no need to adjust the length of the wooden screw 87 protruding from the wall 85 for hanging the watch body, and wall hanging is easy. That is, it is sufficient to screw in the wood screws 87 until the hanger 84 comes into contact with the wall 85, thereby allowing the watch body to be hung in an appropriate state. Furthermore, since the thickness t ₁ of the hanging tool 84 is the same as the thickness s ₁ of the main body back case 1, the watch main body can be hung closely against the wall 85, and therefore the watch main body can be made to look thin. Also,
Since the hanger 84 contacts two points of the entrance portion 88a of the notch 88 of the wall hanging hole 15, the watch body is stably supported against horizontal shaking. Therefore, when designing a watch, the weight balance does not necessarily need to be symmetrical, making the design easier.

FIG. 20 shows a modification of the hanging device. That is,
The wall side of the large diameter portion 84b' of the hanger 84' is formed into a tapered surface 84c. The thickness s′ ₁ of the back surface of the main body back case 1 is the thickness of the small diameter portion 84a′ of the hanging tool 84′.
Slightly thicker than t ₁ , with a small diameter part 84a' and a tapered surface 84
The value is smaller than the sum of the thickness of part c. With this configuration, the weight of the watch body is supported by the tapered surface 84c of the hanger 84'.
This causes the clock body to move closer to the wall. Therefore, the watch body is tightly pressed against the wall 85, making it difficult for the watch body to tilt after being hung. Therefore, even in this case, even if the weight of the watch is slightly uneven, the watch can be hung correctly. Others are the same as those shown in FIGS. 3 and 18.

As described above, the clock of this invention connects the coil and the printed circuit board by pressing the coil connection terminal to the printed circuit board. In contrast, failures such as wire breakage do not occur due to vibration or the like. Furthermore, since it is formed as a coil block with coil connection terminals, there is no need for soldering when assembling it into a watch case, and the assembly work is excellent in workability. Furthermore, since the coil connecting terminal is U-shaped and its opposing piece is sandwiched between the printed circuit board and the case, the contact pressure between the opposing piece and the printed circuit board is stabilized. In addition, since the coil connecting terminal passes through the iron core and is inserted between the opposing piece, the end plate passing through the iron core, and the end face of the coil, it is easy to attach the coil connecting terminal to the coil block. .

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the main body case of an embodiment of this invention, Fig. 2 is an exploded perspective view of the main case shown from the back side, and Fig. 3 is a partial vertical sectional view of the main body case in a wall-hanging state. Fig. 4 is an exploded perspective view of the movement, Fig. 5 is an exploded perspective view of the movement from the back side, Fig. 6 is a plan view of the inside of the movement, and Fig. 7 is an exploded perspective view of the movement.
The figure is a sectional view of the movement, FIG. 8 is an enlarged plan view of the electrodes of the motor, FIGS. 9A and B are exploded perspective views and sectional views showing the fixing structure of the electrodes of the motor, and FIG. 10 is a cross-sectional view of the movement. and the first
Figure 1 is an exploded perspective view and an assembled cross-sectional view showing the coil connection terminal of the motor, Figure 12 is an exploded perspective view of the gear mechanism of the movement, and Figure 13 is an exploded perspective view of the base end of the watch. The bottom view, FIG. 14 is an explanatory diagram of the motor drive circuit block, FIG. 15 is an output waveform diagram of the motor drive circuit block, and FIGS. 16 and 17 are the movement and the back case of the main body. FIGS. 18 and 19 are a perspective view and a front view of the wall hanging hole and the hanger on the back case of the main body, and FIG. 20 is a longitudinal section of another embodiment. It is a diagram. 1... Main body back case, 2... Main unit front case, 3
... Dial plate, 4 ... Solar cell, 6 ... Front cover, 13 ... Movement, 15 ... Wall hanging hole, 16 ... Minute hand shaft, 17 ... Minute hand button (shaft head), 18 ... Minute hand, 18'...Minute wheel, 19...
Hour hand, 21...step motor, 22...iron core,
22a, 22b...Magnetic pole, 23...Rotor, 24
... Gear mechanism, 25 ... Circuit block, 26 ...
Upper case of movement, 27...lower case, 2
8... Coil, 30a... Output gear, 31'...
2nd wheel, 33... Printed circuit board, 35... Crystal resonator, 47... Fixed gear, 48... Internal gear, 4
9... Eccentric cam, 50... Center hole, 76... Movement insertion hole, 84... Hanging tool, 85... Wall.

Claims (1)

[Scope of utility model registration request] A timepiece in which a coil is wound around a substantially annular iron core having magnetic poles at both ends to form a coil block, and a motor for driving clock hands is constituted by this coil block and a rotor disposed between the magnetic poles. A U-shaped coil connection terminal through which the iron core penetrates the web portion is disposed in contact with the end surface of the coil, and has a terminal insertion slit and an iron core insertion hole through which the pair of opposing pieces of the coil connection terminal and the iron core are respectively penetrated. An end plate is placed on the end face of the coil by sandwiching the web portion of the coil connecting terminal, and the pair of opposing pieces of the coil connecting terminal are placed on the opposing faces of the watch case and the printed circuit board of the motor drive coil block. A clock characterized by being pressed into contact with each other.