JPS6158785B2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a digital watch.

Conventionally, in a drum display type digital watch, as a means for giving a click feeling when rotating the display drum when setting the time, the method shown in Figs. 18 to 2 is used.
Various structures shown in Figure 4 have been adopted.
In the one shown in FIG. 18, a notch 74 is provided in the display drum 73, and a lever 76 biased by a torsion coil spring 75 is engaged with the notch 74. In the one shown in FIG. 19, a cam 77 is provided on a display drum 73, and a metal plate spring 78 is engaged with the cam 77. In the one shown in FIG. 20, a lever 80 of the display drum 73 is urged by a spring 81 against a fixed cam 79. However, these figures 18 to 2
In the structure shown in Figure 0, both springs 75 and 7
There is a problem in that the biasing forces of 8 and 81 become a load on the motor, and the motor cannot be driven by a low-power motor such as that used in a battery-powered watch. Note that if the pressing force of the springs 75, 78, and 81 is reduced to the extent that the springs 75, 78, and 81 can be driven, adjustment during assembly will be difficult, and even after completion, the click feeling during operation will not be clear, and furthermore, the position may be misaligned due to vibration, etc. A problem arises.

On the other hand, as structures that do not impose a load on the motor, those shown in Figs. 22 and 23 and those shown in Figs.
There are the ones shown in the figure, the one shown in Fig. 24, etc. In the one shown in FIG. 22, a torsion coil spring 84 attached to a pin 83 of a driven gear 82 is engaged with a locking piece 85 of a display drum 73. However, this device has a problem that it has many parts and is difficult to assemble. In addition, the locking piece 84 and the spring 83
Due to the structure in which the display drum 73 is engaged with the display drum 73, the dimension l of the display drum 73 becomes large, which has the disadvantage that it is not suitable for making the movement thinner. The one in FIGS. 21 and 24 shows an arm 86 provided on the driven gear 82.
The ratchet pawls 87 of the display wheel 73 are engaged with external or internal ratchet teeth 88 and 89, respectively. Although this device requires fewer parts, it has the disadvantage that the number of ratchet teeth 88, 89 on the display drum 73 must be increased, and the rotation pitch of the display on the display drum 73 does not match. This is because the arm 86 provided integrally with the driven gear 82 is made of a molded product.
This is because if the number of ratchet teeth 88, 89 is equal to the number shown, the amount of deflection will increase and the arm 86 will not be able to withstand the strength. Furthermore, if the height of the ratchet teeth 88, 89 is lowered to ensure strength, it becomes possible to stop at positions other than the teeth, which impairs the click feeling. In addition, the arm 86 of the molded product must be kept in a bent state at all times, and as a result, it is vulnerable to aging and thermal environments, resulting in poor reliability.

Therefore, an object of the present invention is to provide a digital clock that can provide a reliable click feeling when setting the time without imposing a load on the motor, and that has a compact and simple structure and is easy to assemble. be.

An alarm clock that forms the basis of this invention is shown in FIGS. 1 to 11. First, the watch movement section will be explained. In FIGS. 1 to 3, reference numerals 1 and 2 are a base plate and a top plate that are provided facing each other. In FIG. 2, for convenience of illustration, the upper plate 2 is shown separated into a flat plate-shaped portion 2a and a card guide 2b integrally provided on the lower surface of the flat plate-shaped portion 2a. A minute indicator wheel 3, a ten minute indicator wheel 4, an hour indicator wheel 5, an AM/PM indicator wheel 6, and other gear wheels are provided between the base plate 1 and the upper plate 2. Minute indicator 3, 10 minute indicator 4 and hour indicator 5
are a pair of disc parts 3a, 3 which are vertically separated from each other.
b, 4a, 4b, 5a, 5b and shaft portions 3c, 4c,
5c, and vertically protruding shaft ends 3c', 4c',
5c' (FIG. 2), it is rotatably supported by bearings 7 to 12 of the upper plate 2 and the lower plate 1. The minute display wheel 3 has five minute cards 13 attached to the upper and lower discs 13a (Fig. 2) provided at the center of the upper and lower edges.
It is rotatably attached by loosely fitting into the card support holes 14 of a and 3b. These five minute cards 13 each have time numbers 1 and 6 on the front and back.
2 and 7, 3 and 8, 4 and 9, 5 and 10 are printed. 10 minute display car 4 also has 3 10 minute cards 1
5 is rotatably attached to the card support hole 16 by loosely fitting it into the card support hole 16 with protrusions (not shown) on its upper and lower edges.
Time numbers 1 and 4, 2 and 5, and 3 and 0 are printed on the front and back of each of the three 10-minute cards 15, respectively.
Similarly, six hour cards 17 are rotatably attached to the hour display wheel 5 by loosely fitting them into the card support holes 18 with protrusions (not shown) on the upper and lower edges. On each hour card 17, time numbers 1 and 7, 2 and 8, 3 and 9, 4 and 10, 5 and 11, and 6 and 12 are printed on the front and back sides, respectively. The AM/PM display wheel 6 is a cylindrical drum, and the letters AM, AM, PM, and PM indicating AM or PM are printed vertically in four places on the outer peripheral surface in the circumferential direction. The AM/PM display wheel 6 is supported by bearings 6a and 6b with shaft portions protruding from the upper and lower ends. This timepiece movement displays the time using the four display wheels 3-6.

The transmission relationship between the motor 19, which is a drive source, and each of the display wheels 3 to 6 will be explained. The motor 19 is fixed to the upper base plate 2. A No. 1 pinion 21 is integrally formed on the rotor 20 of the motor 19, and this rotation is transmitted to the No. 2 gear 22.
The second pinion 22a integrally formed with the second pinion 22a transmits rotation to the minute driven gear 23 of the minute display wheel 3. In addition, 2
The number gear 22 has upper and lower shaft portions 22b integrally formed therein, and a bearing 24 of the base plate 1 and an auxiliary base plate piece 25.
It is rotatably loosely fitted and supported in a bearing hole 26 (FIG. 2). The motor 19 is a step motor that rotates intermittently for several seconds every minute, and moves the minute indicator wheel 3 one pitch (72
The rotation speed is set to rotate by ゜).

Five minute cards 1 supported on minute wheel 3
3 rotates while its both side edges 13b (FIGS. 2 and 4) are inscribed in the card guide 27 provided on the upper plate 2 and the card guide 28 provided on the base plate 1. . The card guide 27 of the upper base plate 2 is provided with a notch at one location in the circumferential direction, and reversing blades 29 are formed on both sides of the notch. The inner end of the reversing blade 29 protrudes slightly inward from the inner diameter of the minute card guide 27, and the minute card 13 is scooped out of the notch by the reversing blade 29 as the minute indicator wheel 3 rotates (counterclockwise). It can be done. Then, as the rotation progresses further, the minute card 13 is reversed so that the time numerals, which had been facing inward, now face outward. In this way, the five minute cards 13 display the minute numbers 0 to 9 every minute. The reason why the reversing blades 29 are provided on both sides of the notch is that the minute card 1 can also be used when reversing the minute indicator wheel 3 when setting the time.
This is to invert 3. Note that the reversing blade 29 is formed continuously with the inner peripheral surface of the minute card guide 27 in a smooth curve. In addition, there is a minute card guide 27 on the upper base plate 2 and a minute card guide 28 on the base plate 1.
and are provided so that they partially overlap each other in the circumferential direction so that the minute card 13 will not get caught at the boundary between them.

In this way, the minute indicator wheel 3 rotates once every 5 minutes, but a part-tooth gear 2 is attached to a part of its outer periphery in the circumferential direction (within an angular range smaller than the rotation angle of 72° for 1 minute).
3b (FIGS. 2, 3, and 5) are integrally formed, and the driven gear 30 of the first pinion 30 (FIG. 6)
It meshes with a. The number of teeth of the first pinion driven gear 30a and the partially toothed gear 23b is selected so that the first pinion 30 rotates half a rotation for each revolution of the minute display wheel 3. Rotating shaft 3 of first pinion 30
3 is rotatably fitted into bearings 31, 32 (FIG. 3) of the upper base plate 2 and base plate 1. Until the partial tooth gear 23b of the minute display wheel 3 comes to the position where the driven gear 30a of the first pinion 30 is sent, the locking disc 23c, which is integrally formed with the minute display wheel 3, prevents the first pinion driven gear 30a from moving. rotation is inhibited. That is, the first pinion driven gear 30a has two short teeth 30 at symmetrical positions with respect to the rotation axis.
a' (FIG. 6), and a portion of the locking disc 23c is located above this low tooth 30a'. In this way, the locking disk 23c
The rotation of the first pinion driven gear 30a is suppressed by contacting the teeth on both sides of the lower tooth 30a'. In this state, when the minute display wheel 3 continues to rotate and the partially toothed gear 23b comes, the short tooth 30
The first pinion 30 starts to mesh with a', and the first pinion 30 is rotated. When the minute wheel 3 rotates through an angle of one pitch of 72°, the first pinion 30 rotates through 180°, so that the opposite lower tooth 30a' goes under the locking disc 23c and the first pinion 30 rotates through an angle of 72°.
0 is locked.

A toothless drive gear 30b formed integrally with the driven gear 31a of the first pinion 30 meshes with a 10-minute display driven gear 34 attached to the shaft portion 4c of the 10-minute display wheel 4. This first pinion drive gear 30b with missing teeth is a driven gear 3 that indicates 10 minutes per rotation.
The number of teeth is selected so that the 10 minute display wheel 4 rotates by 1 pitch (=120 degrees), and the 10 minute display wheel 4 is intermittently advanced by 1 pitch every 10 minutes. 10 minute display driven gears 34 and 10
Although it may be provided integrally with the minute display wheel 4, in this embodiment it is provided separately, and the 10 minute display is displayed in a cutout of a cylindrical projecting wall 35 (FIG. 2) protruding from the upper surface of the 10 minute display driven gear 34. By engaging a protrusion (not shown) provided on the lower surface of the wheel 4, the 10 minute display driven gear 34 and 10
Rotation transmission with the minute display wheel 4 is possible. The 10 minute display driven gear 34 has a missing 10 minute display drive gear 3.
4a is integrally provided, and the second pinion 36
The driven gear 36a is meshed with the driven gear 36a. The driven gear 36 of the second pinion 36 is transferred half a turn in one revolution of the ten minute indicator wheel 4. The second pinion 36 has a driven gear 36a and a toothless drive gear 36b integrally provided with the driven gear 36a.
One rotation (60 minutes) of the second pinion 36 moves the hour display driven gear 37 of the hour display wheel 5 by one pitch (=60 minutes).
゜) Rotate. A shaft 36c of the second pinion 36 is rotatably supported by bearings 36d and 36e. An hourly gear 38 is provided on a part of the outer circumference of the hour display wheel 5 within an angular range of one pitch.
The driven gear 3 of the AM/PM display wheel 6 per revolution of
9 is transferred 1/4 times. It should be noted that the gears 30b, 34a, 36b, and 38 each have a locking disk like the partially toothed gear 23b of the minute display wheel 3.
7 and 39 have short teeth similar to the teeth 30a' of the first pinion 30.

The reversal of the hour card 17 of the hour display wheel 5 is performed by a reversing blade 42 provided in a part of the hour card guide 41, as in the case of the minute card 13.
12 hours are displayed on card 17. 43 in FIGS. 2 and 4 is a card guide when provided on the base plate.

The method for displaying 10 minutes is different from the method for displaying hours and minutes as follows. That is, as shown in FIG.
Minute card 1 in a position perpendicular to the front edge 1' of
3 to display the time. On the other hand, the 10-minute indicator 4 displays the time at a position where the radial direction passing through the card support hole 16 is inclined toward the minute indicator 3 with respect to the front edge 1' of the base plate 1 (approximately 30° angle). Let's do it. Since the display position of the 10-minute card 15 is moved closer to the display position of the minute card 13 in this way, it is avoided that both displays give the viewer an unnatural feeling of being open. Also, 10 minute card information 4 for 10 minute card 15
4 and 45 are provided with notches at three locations, and card reversing blades 46 to 4 are provided on both sides of each notch.
8 is provided. Therefore, every time the 10-minute display wheel 4 rotates one pitch, three 10-minute cards 15 are simultaneously reversed by the respective reversing blades 46 to 48. Since the inverted locations are odd locations, 10
When the minute display wheel 4 rotates once, for example, the 10 minute card 15 that initially displayed the numbers on the front side will now display the numbers on the back side. By inverting it at three places in this way, it is possible to avoid the 10 minute card 15 from interfering with the minute display wheel 3, making it even more effective.
The display positions of the 10-minute card 15 and the minute card 13 can be brought closer to each other. The reversing blades 46-4
8, the reversing blade 46a at the display position also serves as a contact member for stabilizing the 10-minute card 15 at an appropriate display position. A wire spring 49 for pressing the 10-minute card 15 against the reversing blade 46a, which also serves as a contact member, is attached to the base plate 1 by a fixed boss 49a. Note that since both side edges of the minute card 13 and the hour card 17 touch the minute card guides 27, 28 and the hour card guides 41, 43, respectively, there is no problem of instability in the display position.

The means for setting the time will be explained. That is,
A time setting knob 50 is integrally formed with the minute display wheel 3, and by rotating the time setting knob 50, the display on the minute display wheel 3 can be set. In addition, a time setting knob 51 is also provided on the hour display wheel 5.
is fixed thereto, and by rotating this time setting knob 51, the display on the hour display wheel 5 can be set. These time setting knobs 50,
Reference numeral 51 indicates holes 52 and 53 (second
(Figure) and can be operated from the outside. A slip mechanism is provided between the hour driven gear 37 and the hour display wheel 5. That is, the hour driven gear 37 is rotatably press-fitted to the shaft portion 5c of the hour display wheel 5, so that the second pinion 36
Even when the hour display wheel 5 is in the locked state, the time can be set by sliding between the hour driven gear 37 and the shaft portion 5c. Normally, rotation is transmitted due to friction between the hour driven gear 37 and the shaft portion 5cc. The shaft portion 5c of the hour display wheel 5 is provided with means (not shown) for giving a click feeling each time the display rotates one pitch in order to quickly set the time. Note that when rotating the minute display wheel 3 with the time setting knob 50, the minute display wheel 3 and 2
The number gear 22 and the rotor 20 of the motor 19 also rotate. The transmission of this rotation increases the speed, so the resistance to the rotation of the time setting knob 50 becomes large, but if it becomes too large and interferes with operation, the minute driven gear of the time setting knob 50 and the minute indicator wheel 3 23
It is desirable to provide a slip mechanism similar to that of the hour indicator wheel 5 between the second gear 22 and the second pinion 22a.

Next, the guideline mechanism will be explained. Two support shafts 54 and 55 are protruded from the upper surface of the top plate 2, and a minute switch wheel 56 and a minute guide setting wheel 57 are rotatably fitted to one of the support shafts 54. The other spindle 5
An hour switch wheel 58 and an hour reference setting wheel 59 are rotatably fitted to the wheel 5. The minute guide setting wheel 57 has numbers 0, 5, 10, ...55 (7th
) is printed. The hour guide setting wheel 59 has guide numbers 1 to 24 printed on its surface. Further, the minute switch wheel 56 and the hour switch wheel 58 have driven gear portions 56a and 58a on their outer peripheries. On the other hand, a minute small gear 60 is integrally formed at the upper end of the minute display wheel 3 of the timepiece movement section, and meshes with the reference transmission gear 61 at a notch formed in the minute display wheel bearing 8 of the upper base plate 2. The reference transmission gear 61 has an integrally formed pinion 61a, and meshes with the gear portion 56a of the minute switch wheel 56 at the pinion 61a. The reference transmission gear 61 is rotatably attached to the upper base plate 2. Further, an hour pinion 62 is integrally formed at the upper end of the hour display wheel 5 of the timepiece movement, and is directly connected to the gear portion 58a of the hour switch wheel 58 through a notch provided in the hour display bearing 12 of the upper base plate 2. It meshes with the. minute switch car 5
The number of meshing teeth is selected so that the clock 6 rotates once every hour, and the hour switch wheel 58 rotates once every 24 hours.

Ring-shaped fixed contacts 63 and 64 are provided on the upper surface of the upper plate 2 concentrically with the support shafts 54 and 55 of the minute switch wheel 56 and the hour switch wheel 58, respectively. These fixed contacts 63 and 64 are connected to an alarm circuit via integrally provided electrodes 63a and 64a. A contact spring 65 having two sliding contact pieces 65a and 65b projecting upward and downward is fixed to the minute switch wheel 56. The downwardly protruding sliding contact piece 65b is always in sliding contact with the minute fixed contact 63. On the other hand, a ring-shaped minute setting contact 66 is fixed to the lower surface of the minute guide setting wheel 57, and a portion of the minute setting contact 66 is provided with a minute detecting protrusion 66a that projects inward. The shaded area in FIG. 10 indicates the minute setting contact 66.
The sliding contact piece 65a above the minute switch wheel 56 slides on the lower surface of the minute guide setting wheel 57 at a radial position so as to be able to contact the minute detecting protrusion 66a. A contact spring 67 is similarly fixed to the hour switch wheel 58, and a sliding contact piece 67a projecting downward from the contact spring 67 is always in sliding contact with the hour fixed contact 64. The upwardly protruding sliding contact piece 67a is connected to the hour detection protrusion 68 of the ring-shaped hour setting contact 68 provided on the lower surface of the hour reference setting wheel 59.
Hour reference setting wheel 59 at a radial position where it can be contacted with a.
Slide on the underside of the. Minute setting contact 66 of minute setting wheel 57 and hour setting contact 68 of hour setting wheel 59
are always in sliding contact with the contact pieces 69a at both ends of the transmission spring 69. The transmission spring 69 is fixed to the upper base plate 2. In addition, the minute guide setting wheel 57 and hour guide setting wheel 59 have 1 minute increments and 1 minute increments on the outer periphery, respectively.
It has uneven portions 70 and 71 arranged in time increments, and two click springs 69b integrally formed with the transmission spring 69 come into elastic contact with the uneven portions 70 and 71, respectively.

In this way, from the fixed contact 63 to the sliding contact 65
b. The sliding contact piece 65a, the minute detection protrusion 66a, the ring-shaped part of the minute setting contact 66, which constitutes the minute switch along the path to the transmission spring 69, and the ring-shaped part of the hour setting contact 68 from the transmission spring 69; Time detection protrusion 6
8a, the sliding contact piece 67a, the sliding contact piece 97b, and the path leading to the hour fixed contact 64 constitute a time switch.
Then, when both the minute switch and the hour switch are closed, an alarm sound is generated from the speaker of the alarm control circuit provided between the electrodes 63a and 64a. That is, the minute guide setting wheel 57 and the hour guide setting wheel 5
9 is set at an arbitrary angle, and the sliding contact pieces 65a, 67a of the switch wheels 56, 58 come into contact with the detection protrusions 66a, 68a whose positions are determined thereby, and the alarm sound is emitted. Occur.

FIG. 11 is a block diagram of the guide mechanism. In the figure, 70' is a crystal oscillation circuit of a timepiece movement, 71' is a drive circuit for driving the motor 19 (FIG. 2), and 72 is a drive mechanism including the motor 19 and the like. Minute display wheel 3, 1st pinion 30, 10 minute display wheel 4, 2nd pinion 36, hour display wheel 5, AM・
The PM display wheel 6, reference transmission gear 61, minute switch wheel 56, hour switch wheel 58, etc. are given the same reference numerals as in each of the figures up to FIG. 73 is an alarm control circuit, 74 is a speaker drive circuit, and 75 is a speaker. The sliding contact piece 66 above the minute switch wheel 56 is the detection contact 6 of the minute indicator setting wheel 57 (Fig. 2).
6a once every 60 minutes. The sliding contact piece 67a above the hour switch wheel 58 contacts the detection contact 68b of the hour reference setting wheel 59 once every 24 hours.

In this way, the operation of the clock movement and the operation of the reference mechanism can be obtained, but the minute display wheel 3 and the hour display wheel 5 of the clock movement are arranged side by side so as to be rotatable around the vertical axis, and these minutes are displayed. Since the minute switch wheel 56 and the hour switch wheel 57 of the indicator mechanism are arranged above the wheel 3 and the hour display wheel 5, there is an advantage that the rotation can be easily transmitted to the minute switch wheel 56 and the hour switch wheel 57. . In other words, the distance between the minute switch wheel 56 and the minute display wheel 3, which is the driving source, and the distance between the hour switch wheel 58 and the hour indicator wheel 5, which is the driving source, can be shortened, so that the distance between the minute switch wheel 56 and the hour indicator wheel 5, which is the driving source, can be shortened. Rotation can be transmitted using a simpler gear mechanism than in the case of transmitting rotation. Furthermore, the entire watch can be made smaller and thinner.

Note that the clock movement section and the guide mechanism section are housed in a case (not shown), and the hour guide setting wheel 5 is housed in a case (not shown).
9 and the displayed numerals of the minute indicator setting wheel 57 are exposed through a window provided in the case. Further, part of the outer periphery of the hour guide setting wheel 59 and the minute guide setting wheel 57 is exposed outside the case, and the rotation operation is performed using this exposed portion.

Next, an embodiment of the present invention is shown in FIGS. 12 to 15. Note that the same parts as those of the timepiece shown in FIGS. 1 to 11 are designated by the same reference numerals, and the explanation thereof will be omitted. That is, in this digital watch, a polygonal cam 90 is provided protruding from the lower surface of the lower disc portion 5b of the hour display wheel 5, and a U-shaped spring 91 that elastically clamps the polygonal cam 90 is attached to the hour driven gear 37. This is what I did. As mentioned above, the hour display wheel 5 is intermittently driven by a motor 19 (FIG. 3) via a gear train, and is driven by six hour cards 17.
(Fig. 1) is rotated for each pitch of each card support hole 18 to which it is attached. The number of corners of the polygonal cam 90 corresponds to the number of hour cards 17 of the hour display wheel 5, and is formed into a hexagonal shape. The hour driven gear 37 is rotatably engaged with the shaft portion 5c'' of the hour display wheel 5, and is intermittently driven by the second pinion drive gear 36b (FIG. 3) serving as a lower gear as described above. U
The letter-shaped spring 91 is made of a wire spring, and its opposing pieces are parallel to the opposite side of the polygonal cam 90 and are slightly narrower than the width of the opposite side. The U-shaped spring 91 is attached to the hour driven gear 37 using three hook-shaped mounting claws 92 protruding from the hour driven gear 37.
94. The spacing between the mounting claws 92 and 93 is made slightly narrower than the width of the U-shaped spring 91 in its natural state. Note that in order to facilitate the work of press-fitting the polygonal cam 90 between the U-shaped springs 91 when fitting the hour driven gear 37 to the shaft portion 5c'' of the hour display wheel 5, the ridgeline portion of the polygonal cam 90 is It is formed into a tapered surface or chamfered. Also, if the hour driven gear 37 is loosely engaged with the shaft portion 5c'' of the hour display wheel 5, the hour driven gear 37 may tilt or come off in the axial direction. Since the slip-off ring 95 is press-fitted and fixed to the shaft portion 5'' because it slides on the base plate 1 and the load increases.This prevents the hour driven gear 37 from coming off in the axial direction. This eliminates the vibration caused by the tilt of the 37.

Next, the operation of this digital clock will be explained.
The time driven gear 37 is the lower first pinion drive wheel 3
It is locked so that it cannot rotate by a locking disk portion 6b (FIG. 2), and is rotated by one step by the first pinion drive gear 36b, which has missing teeth, only when it is on the lift. Accompanying this rotation, the hour display wheel 5 is rotated by one step via the clamping pressure portion of the polygonal cam 90 and the U-shaped spring 91. When setting the time on the hour display wheel 5, the shaft portion 5c of the hour display wheel 5 is rotated by hand. At this time, even if the hour driven gear 37 remains unrotatably locked, the corners of the polygonal cam 90 bend the linear U-shaped springs 91 as shown in FIGS. 15A to 15C. It is possible to rotate between opposite sides of the U-shaped spring 91 to the next stable position. Further, since the U-shaped spring 91 is bent at the corner of the polygonal cam 90 in this way, a click feeling can be obtained. In this way, the time is set and the rotation is transmitted, but since the rotation is transmitted to the hour display wheel 5 via the U-shaped spring 91 to provide a click feeling, the U-shaped spring 91 is used to control the motor 19. It does not become a burden. In addition, since the structure is such that the U-shaped spring 91 is simply fitted to the polygonal cam 90, the structure is simple and can be downsized, and there is no need for troublesome adjustment work, resulting in good assemblability.

FIG. 16 shows another embodiment. That is, a retaining pin 96 is provided protruding from the hour driven gear 37 with a gap equal to the wire diameter d of the U-shaped spring 91 on both sides of the mounting claw 94. If the U-shaped spring 91 is supported only by the hook-shaped support claws 92 to 94, the front, rear, left, and right positions of the U-shaped spring 91 cannot be determined, and there is a risk that the U-shaped spring 91 will fall off when being carried. 96 prevents the U-shaped spring 91 from falling off in the left-right direction and forward as shown in FIG. 16, so that the U-shaped spring 91 is positioned in the front, back, right, and left directions, and does not fall off.
When installing the U-shaped spring 91, refer to Figures 17 A to D.
As shown in , first, the U-shaped spring 91 is stood vertically to the driven gear 37, inserted into the gap _d1 between the mounting claw 94 and the retaining pin 96, and then the U-shaped spring 91 is vertically erected. Rotate it 90 degrees and pass through the other gap d ₂ . Thereafter, the U-shaped spring 91 is moved to a position where it straddles both pins 96, and then the U-shaped spring 91 is folded down and the tip of the U-shaped spring 91 is hooked on another attachment claw 92, 93 while being bent.

In the above embodiment, a click mechanism consisting of a polygonal cam 90 and a U-shaped spring 91 was provided for the hour indicator wheel 5, but the same mechanism can be provided for the minute indicator wheel 3 as well. In the case of the minute display wheel 3, the number of minute cards 13 is five, so the polygonal cam is a pentagon.

Further, in the above embodiment, the hour display wheel 17 is provided with a polygonal cam 90, and the hour driven gear 37 is provided with a U-shaped spring 91.
However, conversely, a polygonal cam may be provided on the hour driven gear 37 and a U-shaped spring may be attached to the hour display wheel 5.

As described above, in the digital watch of the present invention, a polygonal cam is provided on one side of the opposing surface of the display wheel and the driven gear that transmits rotation thereto, and a U-shaped spring that sandwiches the polygonal cam is provided on the other side. Because of this, when the display wheel is rotated to set the time, the polygonal cam rotates within the U-shaped spring while bending this spring, thereby providing a click sensation. Furthermore, since the rotation of the motor is transmitted to the display wheel via this U-shaped spring, the U-shaped spring does not become a load on the motor. Furthermore, since the structure is just a U-shaped spring and a polygonal cam, the structure is simple and compact, and there is no need for troublesome adjustments, making assembly easy. .

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the timepiece movement that is the basis of this invention, Fig. 2 is an exploded perspective view of the entire movement,
FIG. 3 is a cross-sectional view of the entire staircase, FIG. 4 is a cross-sectional plan view of the timepiece movement, FIG. 5 is a schematic plan view of the gear train of the timepiece movement, and FIG. 6 is a cross-sectional view of the timepiece movement. 1 pinion, FIG. 7 is a partially exploded perspective view of the guide mechanism, FIG. 8 is an exploded perspective view of the switch wheel, and FIGS. 9 and 10 are the guide setting wheels. 11 is a block diagram of the reference mechanism, FIG. 12 is a partially exploded perspective view of an embodiment of the present invention, FIG. 13 is a sectional view thereof, and FIG. A perspective view of the gear, Fig. 15 is also an explanatory diagram of its operation, Fig. 16
The figure is a perspective view of the time driven gear in another embodiment, FIG. 17 is an explanatory diagram of the installation work of the U-shaped spring, and
8 to 21 and 24 are respectively perspective views of a conventional display drum click mechanism of a timepiece, and FIGS. 22 and 23 are a side view and a sectional view of the conventional display drum click mechanism. 1...Base plate, 2...Top plate, 3...Minute display wheel, 4...10 minute display wheel, 5...Hour display wheel, 6...
AM/PM display car, 13... minute card, 15...
10 minute card, 17...hour card, 19...motor, 27, 28...minute card guide, 29...reversing blade, 36...2nd pinion, 37...hour driven gear, 41...hour card guide , 43... hour card information, 44, 45... 10 minute card information, 56...
...Minute switch car, 57...Minute guide setting car, 58...
...Hour switch car, 59...Hour reference setting car, 60...
...Minute pinion gear, 61...Standard transmission gear, 65a, 6
5b...Sliding contact piece, 66...Minute setting contact, 67
a, 67b...Sliding contact piece, 90...Polygonal cam,
91...U-shaped spring, 92-94...Mounting claw, 9
6...Retaining pin.

Claims (1)

[Scope of Claims] 1. A display wheel that is rotatably supported and has time displays at regular intervals in the circumferential direction, and a display wheel that is rotatably provided coaxially with the display wheel and is intermittently driven to rotate by a drive mechanism. a driven vehicle; a polygonal cam protruding from one of opposing surfaces of the display vehicle and the driven vehicle and having the same number of corners as the number of time display positions of the display vehicle; and the display vehicle. and a U-shaped spring member that is attached to the other of the opposing surfaces of the driven vehicle and elastically clamps the polygonal cam. 2. A means for attaching the U-shaped spring to the mutually opposing surfaces of the display vehicle and the driven vehicle is provided protrudingly from one of the opposing surfaces so as to face each other, and is attached to opposing side portions of the U-shaped spring. a pair of hook-shaped end mounting claws that lock the ends, a hook-shaped center mounting claw that protrudes from the opposing surfaces of the ends and locks the portions between opposing sides of the U-shaped spring; A pair of retaining pins are provided on opposing side portions of the U-shaped spring and protruding from the opposing surface, respectively, and sandwiching the portion between the opposing sides of the U-shaped spring with the central mounting claw. A digital watch according to claim 1.