JP2555149Y2 - Clock train structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel train structure of a multi-time display clock of a hand display type.

[0002]

2. Description of the Related Art Conventionally, there has been a multi-time display clock capable of displaying other times in addition to a normal time, such as a world clock display which is found on a part of a digital clock. As is well known, the display is switched by a push button operation or the like to display a time other than the home time. Similarly, in a hand-held timepiece, a watch capable of displaying multiple times recently has come to be seen. That is, in addition to displaying the local local time as the home time, the time of another area as the local time is displayed directly, or by switching and displaying by push button operation etc. like a clock with a time difference display function added Some display the time in another area.

[0003] The structure of the movement of the pointer-type timepiece, in which the multiple times are displayed by multiple hands as described above, is based on the use of a plurality of small completed movements commonly used for bracelet watches and the like, which are carried by women. It is stored in a predetermined position of a concave portion provided in a resin middle frame, fixed to a watch case, and a dial or a pointer is attached to each movement to display multiple times with multiple hands. Since the multi-time display hand clock having such a structure has the same number of time display units as the plurality of clock movements, the user can freely set the home time display and the local time display among the plurality of time display units. Can be selected and used.

In order to correct the time of such a timepiece, a crown as an external operation member is provided on an extension line connecting the center of the timepiece and the center of each time display part. A plurality of times can be set by pulling out the crown that matches with.
In the case of a multi-timepiece having a plurality of crowns, when the crown comes directly above or below and overlaps the band, a watch with a special design in which the crown is arranged near the band stopper has also appeared.

[0005] Another example of the structure of a movement of a pointer-type timepiece with a multi-time, multi-hand display is Japanese Utility Model Laid-Open No. 1-129684.
There are also those described in Japanese Unexamined Patent Publication No. According to this publication,
A wheel train is formed in four directions from an hour wheel and a plurality of display wheels are arranged on concentric circles to display multiple times with multiple hands.

[0006] Further, as a timepiece having a time difference display function added to an ordinary hand-displaying three-hand timepiece or the like, see Japanese Patent Application Laid-Open No. 55-30 / 1979.
There is a planetary wheel system proposed in the embodiment of Japanese Patent Publication No. 676, which is composed of a sun wheel with position-restricted 11 teeth, a planetary wheel, and an hour wheel with 12 teeth for fixing the hour hand. Then 6
In this system, the planetary car rotates around the sun wheel with the rotation of the second wheel, which makes one rotation in 0 minutes, and the hour wheel rotates at a reduction ratio of 1/12.

[0007]

[Problems to be Solved by the Invention] However, in the former multi-clock with hands display, since a plurality of small movements are mounted in the recessed storage portion of the middle frame, it is difficult to position the movements between the movements. Interference or displacement with the relief hole of the hour wheel fixing hour wheel attachment provided tends to cause chopping or poor appearance.

Further, since a multi-time display is constituted by a plurality of small movements, the number of man-hours for assembling is large, and the number of parts is large, so that the timepiece movement becomes considerably high in cost, resulting in an expensive wristwatch. The size of the clock is quite large compared to the others.

Further, the hand setting of the multi-time display unit must be corrected individually for each of the plurality of display units. For example, when the time display unit is directly above or below the clock, the crown operation is not performed. This makes it very difficult for the user to perform the needle setting operation, and the plurality of display units are driven independently of each other, which may cause a reading error due to a wrong crown operation by the user.

[0010] The following Japanese Utility Model Laid-Open Publication No.
In the pointer-display-type multi-time clock shown in FIG. 1 of the Japanese Unexamined Patent Publication, a wheel train must be formed in multiple directions from an hour wheel, and the rotation directions of the hands and the display hands are the same as in FIG. In addition, since an intermediate wheel (referred to as a planetary wheel in this publication) is arranged as a pair in one display wheel, it takes a lot of man-hours to process a wheel train and assemble a timepiece movement, thereby increasing costs. On the other hand, in the other embodiment shown in FIG. 4, for example, when an attempt is made to make a hands display type multi-time clock, the hand movement direction of the local time display hand is opposite to the rotation direction of the home time hands. Therefore, there is a danger that a minute reading difference may occur with respect to the hour character, which is not practical.

Further, JP-A-55-30676 mentioned last.
In the time difference correction clock proposed in the official gazette, when the local time of another area is viewed, the time for displaying the normal time of the home time is corrected, so the hour hand moves and the time of the home time switches, so the local time is changed. Time becomes difficult to understand.

An object of the present invention is to reduce the cost of a timepiece movement and to provide a low-cost multi-time display timepiece that is easy for a user to use and that is easy to operate.

[0013]

In order to achieve the above object, the present invention has the following arrangement. A pointer-driven vehicle that drives a pointer substantially at the center of the display unit, and a transmission wheel that meshes with the pointer-driven vehicle; the transmission wheel includes a plurality of auxiliary needle-driven vehicles that can display at least two or more different times. It is characterized by being engaged.

Further, the pointer-driven vehicle is a minute wheel, and the transmission wheel constitutes a second minute wheel that transmits the rotation of the minute wheel to the hour wheel.

Further, the auxiliary needle driving wheel is a dual second wheel, and the dual second wheel constitutes a planetary wheel for driving a dual hour wheel rotating concentrically with the rotation center of the auxiliary needle driving wheel. It is characterized by being.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an external view of a timepiece according to an embodiment of the present invention, FIG.
Is a plan view of the left half seen from the back cover side of the clock movement,
3 is a plan view of the right half as viewed from the back cover side of the watch movement, FIG. 4 is a plan view of a left half as viewed from the hands side of the watch movement, and FIG. 5 is a right half as viewed from the hands side of the watch movement. FIGS. 6, 7 and 8 are cross-sectional views of essential parts showing the wheel train mechanism of the timepiece shown in FIG. 1 to 8, the same numbers indicate the same components. In FIG. 1, reference numeral 1 denotes an hour hand which rotates one time in 12 hours around a substantially central portion of the timepiece, 2 denotes a minute hand which is coaxial with the hour hand 1 and makes one rotation in 60 minutes, and 3 denotes a hour hand which is also coaxial with the hour hand 1 and takes 60 seconds. The rotating second hand,
These guidelines indicate the local normal time. Reference numeral 4 denotes a first time difference display unit that represents a first time difference time, 5 denotes a second time difference time display unit that represents a second time difference time, 6 denotes a third time difference time display unit that represents a third time difference time, Each time difference time display section 4,
Reference numerals 5 and 6 are arranged in three directions at a substantially equal distance from a substantially central portion of the timepiece. The time difference display units 4, 5, and 6 include a local time hour hand (hereinafter abbreviated as an LT hour hand) 4a, 5a, 6a that makes one rotation in 12 hours,
The local time minute hand (hereinafter abbreviated as the LT minute hand) 4b, 5b, and 6b, which makes one rotation in 60 minutes, displays the time difference time using two hands. Reference numeral 7 denotes a calendar display and a date hand 7
The date a is represented by “a” making one reciprocation in a one-month cycle by the oscillating drive.

Reference numeral 8 denotes a crown as an external operation member. The number of external switching pull-out stages can be set to two stages. In a normal use state, the crown is used at the most depressed position (0-stage position). When the clock is rotated clockwise, the date can be quickly corrected, and when the second hand is further pulled down, the second hand stops at an arbitrary position, and when the crown 8 is rotated left and right, the hour hand 1 and the minute hand 2 rotate to the current time. Needle adjustment can be performed. 9, 10 and 11 are push buttons (hereinafter abbreviated as PB) (1) which are external operation members for correcting the hands of the LT hour hands 4a, 5a and 6a.
(2) and (3), each time the button is pressed once
(1) First time difference display section 4 at 9, second time difference display section 5 at PB (2) 10, third time difference display section 6 at PB (3) 11.
LT hour hands 4a, 5a, 6a can be corrected in hourly units. This hand correction is always possible by operating each of the PBs 9, 10 and 11 irrespective of the position of the number of steps of pulling out the crown 8.

Next, the basic structure of the timepiece movement will be described. In the watch movement of FIGS. 2 and 3,
(A) shows a large-scale mass-produced small three-hand module (hereinafter referred to as a basic module) with hatching attached to the approximate center of the timepiece movement. Is being planned.

Referring to FIG. 7 or FIG. 8, the timepiece movement structure of the present invention has the basic module (A) disposed on the back cover side with the main plate 12 serving as the base of the basic module (A) interposed therebetween. Dial 12 and dial 13 on the dial side
And a two-layer structure in which a local time display wheel train 15 and a calendar display wheel train 16 based on the underlay 14 are disposed in the hollow section of the cross section of the base plate 12 and the underlay 14 at one place. (See FIG. 5) to stabilize parts that are temporarily assembled.

The basic module (A) includes a rotor 21, a fifth wheel 22, which constitutes a step motor 20 as an electromechanical converter, which is supported by a main plate 12, a train wheel bridge 18, a middle bridge 19, and the like. A pointer wheel train mechanism including a 4th wheel 23, a 3rd wheel 24 or a center wheel 25, an external operation switching mechanism including a winding stem 26 for fixing the crown 8 as a component, and a battery 27 which is a power source of an electronic timepiece. , IC
A circuit block 28 having a chip 28a and a crystal unit 28b mounted thereon is provided.

The fourth wheel & pinion 23, which is disposed substantially at the center of the basic module (A) and has the second hand 3 fixed thereto, is driven by the rotor 21 via the fifth wheel & pinion 22. Further, the rotation of the fourth wheel & pinion 23 is performed by the center wheel &
It is told to. The center wheel 25 has a well-known slip structure including a center gear 25a and a minute pinion 25b. The minute wheel 25b is engaged with a minute wheel 29 for driving a local time display wheel train 15 to be described later.
Drive at a rate of one revolution per minute.

The center wheel 25 constitutes a hand wheel train and meshes with a minute wheel 30 on the first day constituting a back wheel train for correcting hands at normal time (see FIG. 3). The minute wheel 30 of the first day
Drives the center wheel 25 in conjunction with the rotation of the ratchet wheel 31 which rotates by engaging with the winding stem 26. That is, when the crown is pulled in two steps to adjust the hands, the mandrel 32 and the kannuki 33 which constitute an external operation switching mechanism are well known.
The pinion wheel 31 linked to the winding stem 26 moves to a position where it engages with the small wheel wheel 34, and in conjunction with the rotation operation of the crown 8, the small wheel wheel 34 → the minute transmission wheel 35 → the first day minute wheel 30 Rotational force is transmitted along the path.

Next, the local time display wheel train 15 and the calendar display wheel train 16 will be described with reference to FIGS.
Referring to FIG. 6, the center wheel 25 engaged with the center wheel 25 disposed in the basic module (A) has a center hole engaged with the outer diameter of the intermediate body 25c of the center pin 25b, and The projection 29a provided on the transmission wheel 29 is formed so as to mesh with a part of the tooth profile 25d left on the intermediate body 25c in a planar manner. The engagement of the convex portion 29a with the tooth shape 25d in this manner ensures that the rotational force transmitted to the center wheel 25 is transmitted to the next wheel. Therefore, according to the embodiment of the present invention, the transmission wheel 29 is attached to the center wheel 25 in comparison with the fixing structure in which the transmission wheel made of synthetic resin is press-fitted and fixed to the middle body of the center wheel as seen in some watches. When applying or removing, it is less likely to apply an excessive load to other components, so that components can be stably incorporated without damage.

Referring to FIG. 4 and FIG.
The second rotational force is arranged so that the rotational force of No. 9 does not overlap in a planar manner.
It is transmitted to both the minute wheel 36 and the third minute wheel 37.
The former minute wheel 36 on the second day is a dual second wheel (1) 38 of the first time difference display unit 4, a dual second wheel (2) 39 of the second time difference display unit 5, and the minute indicator 29. It is disposed substantially at the center of the substantially delta-shaped plane space formed by the above, and is formed by a gear portion (1) 36a, a gear portion (2) 36b, and a pinion portion 36c. And the gear part (1) 36
a meshes with the transmission wheel 29, and the gear portion (2) 36b is a dual second gear (1) 38a forming a dual second wheel (1) 38 and a dual second gear forming a dual second wheel (2) 39. The pinion portion 36c meshes with the gear (2) 39a, and further meshes with the hour wheel 40 to which the hour hand 1 for displaying the normal time is fixed, and the respective meshing portions are arranged so as not to overlap with each other in cross section.

The gear (1) 36a and the gear (2) 3
Reference numeral 6b denotes an idler wheel for transmitting the rotation of the transmission wheel 29 and the rotation of the dual second gears (1), (2) 38a, 39a so that they rotate simply at the same speed.
As shown in FIG. 2, the meshing cross-sectional arrangement is made into two layers so as to mesh with two pairs of the gear portion (1) 36a and the gear portion (2) 36b. You can now choose freely for the train wheel. Therefore, the dividing wheel 29 and the dual second gear (1) 3
The number of teeth of the 8a and the dual second gear (2) 39a may be different even if they are not common. In particular, the dual second wheel (1) adapted to the planar arrangement of the time difference time display unit in consideration of the design of the timepiece. 38 and the dual second wheel & pinion (2) 39 can be disposed at appropriate positions where they engage with each other.

As shown in FIG. 5, the second minute wheel 37 engages with the dual second gear (3) 41a of the dual second wheel (3) 41 forming the third time difference display section 6, and Like the minute wheel 36 on the second day, the rotation of the minute transmission wheel 29 is transmitted at the same speed.

The LT hour hands 4a, 5a, 6a and the LT minute hand 4b, which are constituent elements of the time difference time display sections 4, 5, 6 described above,
The local time display wheel train 15 for fixing and rotating the wheels 5b and 6b is driven by the following wheel train configuration. That is, the first time difference display section 4, the second time difference display section 5,
Each wheel train configuration of the third time difference display unit 6 is the same wheel train configuration from the minute wheel 29 to the minute wheel 36 of the second day or the minute wheel 37 of the third day. Only the wheel train configuration at the center of the first time difference display unit 4 will be described with reference to FIGS.

The center portion of the train wheel constituting the first time difference time display section 4 employs a so-called planetary car system and has the following structure. That is, the center shaft 14a is
A dual wheel (1) 43 and a dual second wheel (1) 38 are engaged with the central shaft 14a, and a dual hour wheel (1) 46 is engaged with the dual second wheel (1) 38. Are engaged. The dual wheel (1) 43 is formed with 11 teeth, and its rotation is regulated by the dual jump control spring 42. The dual second wheel (1) 38 is a dual second gear (1) 38a that meshes with the second minute wheel 36, and the planetary wheel (1) provided up and down via the dual second gear (1) 38a. , (2) 44, 45. The planetary wheel (2) 45 passes through the rotary hole 38b provided in the dual second gear (1) 38a and is concentric with the planetary wheel (1) 44.
Are integrally formed. The dual hour wheel (1) 46 has the LT hour hand (1) 4a fixed thereto and is formed with 12 teeth. The dual hour wheel (1) 46 meshes with the planetary wheel (2) 45 and has the dual wheel (1) 43 and the dual second wheel ( 1) It is arranged coaxially with 38. And, the dual hour wheel (1) 46, the dual second wheel (1) 38,
The dual wheel (1) 43 is always supported by the lower support 1 due to the reaction force of the spring of the dual needle seat (1) 47 having a spring property disposed in the hollow section of the dial 13 and the dual hour wheel (1) 46 in cross section.
It is pressed to the 4 side.

The dual second wheel (1) 38, which rotates at the same speed as the center wheel 25 via the minute wheel 36 on the second day, is configured to make one rotation in the clockwise direction in 60 minutes. The planetary wheel (1) 44 meshing with the dual wheel (1) 43 with the rotation of the dual second wheel (1) 38 moves along the locus of the tooth profile 43a of the dual wheel (1) 43 whose position is regulated. While sliding, it rotates clockwise about a rotary hole 38b provided in the dual second gear (1) 38a. Further planetary cars (2) 4
5 is a dual hour wheel (1) 4 that rotates in the same direction in synchronization with the planet wheel (1) 44 and meshes with the planet wheel (2) 45.
6 is the dual second wheel (1) 3 because the pressing force from the tooth profile of the planet wheel (2) 45 overcomes the frictional force between the dual needle seat (1) 47 and the dual hour wheel (1) 46.
8 and at a speed of 1/12 reduction ratio and rotates clockwise in the same manner as the dual second wheel (1) 38. Regarding the driving method of the dual second wheel (1) 38 and the dual hour wheel (1) 46, the same rotation operation is performed not only at the time of normal hand operation but also at the time of hand adjustment.

Next, LT for displaying the local time
The correction of the time difference of the hour hand will be described with reference to FIGS.
A dual correction lever (1) 49, which is disposed near the dual wheel (1) 43 and operates around a boss 48a integrally formed with a calender plate 48 made of synthetic resin, is a PB (1) 9 as an external operation member. Each time the PB (1) 9 is pushed once in conjunction with the control, the dual wheel (1) 43 engaged with the tooth profile 43a is fast-forwarded by one hour. When the PB (1) 9 is released, the dual correction lever (1) 49 is always stopped at a predetermined position by a return spring 50 disposed on the outer peripheral side of the timepiece movement.

Although the hand setting and the correction mechanism of the first time difference time display unit 4 have been described above, other time difference time display units 5 and 6 have been described.
Has basically the same mechanism. In particular, the second time difference display unit 5 is connected to the dual correction lever (1) 49 in order to interlock with the PB (2) 10 arranged at 2 o'clock in order to improve the operability at the time difference correction. In comparison, the external shape of the dual correction lever (2) 51 is different, but the operation direction at the time of correction and the action of the return spring are the same.

As described above, since the normal time display wheel train and the time difference time display wheel train are interlocked, the time difference time display unit can be simultaneously set at least by setting the normal time hands. Since the time difference correction can be set by the one-touch operation of the push button described above, the operation method is easy to understand, and the user does not easily perform an erroneous operation, and it is possible to prevent a conventional display alignment error.

Next, a calendar mechanism in which the date hand 7a swings and drives in a one-month cycle will be described with reference to FIGS. The hour wheel 40 having the cylindrical portion 40a which meshes with the pinion 36c of the second minute wheel 36 described above and fixes the hour hand 1 for displaying the normal time is attached to the cylindrical portion 4a with respect to the cylindrical gear 40b.
0a has a date transmission gear 40c on the surface on the opposite side, and the date transmission gear 40c rotates once in 12 hours,
The rotational force is transmitted to the date wheel 52, which is the next gear.

The date wheel 52 is a date transmission gear 40c.
, And makes one rotation in 24 hours. Further, the date wheel 52 is integrally formed with a date nail 52a for transmitting rotation to a date intermediate wheel (2) 53 constituting a cam device for swinging and moving the date hand 7a in a one-month cycle. The date nail 52a is a middle day wheel (2) 5
3 and once every 24 hours,
At the same time as rotating 31 times, the rotation force is transmitted to the date wheel 55 and the date wheel 56 to which the date hand 7a is fixed via the date intermediate wheel (1) 54.

The date wheel 52 is rotated around the date axle 14b implanted in the support 14, but when the date hand 7a described later is quickly corrected, the date intermediate wheel (2) 53 and the date nail are used. When the 52a interferes, the rotary hole 52b that engages with the date turning axle 14b is elongated so as not to damage the parts,
For example, when an external force is applied to the date intermediate wheel (2) 53 via the external operating member, the rotational force from the date intermediate wheel (2) 53 is rotated by the date rotating claw 52a by the elongated rotary hole 52b. Although transmitted to the car 52, the date driving wheel 52 is separated from the meshing position by the rotational force of the date intermediate wheel (2) 53, so that there is no problem.

The cam device for swinging and moving the date hand 7a includes a cam 53a integrally formed with the date intermediate wheel (2) 53, and a tooth profile 54a meshed with the date wheel 55 with respect to the rotation center of the date intermediate wheel (1) 54. A lever 54b provided on the side opposite to
The lever portion 54b of the date intermediate wheel (1) 54 is always pressed to the cam 53a side via the cam and the date reversing wheel 56 provided for reliably operating the lever portion 54b along the trajectory of the cam 53a.
And a date return spring 57a. The contour of the cam 53a is formed such that the date intermediate wheel (1) 54 is driven at a constant speed, and as a result, the date hand 7a moves in the clockwise direction at equal intervals. The Japan-China car (2)
53 is positioned by a jump control spring 57b integrated with the back plate 57, stabilizes the static positions of the cam 53a and the lever 54b to prevent the date hand 7a from swaying in the plane direction, and also sets the date hook 52a. And a quick-correction lever 58 that constitutes a quick-correction mechanism for the date hand 7a
And the engagement with it.

Referring to FIG. 8, a mechanism for quickly correcting the date hand 7a will be described. The quick correction of the date hand 7a is performed by the quick correction claw 5 attached to the pinion wheel 31 which engages in the axial direction of the winding stem 26 constituting the external operation switching mechanism mounted on the basic module.
9 and the boss 4 integrally formed with the calendar plate 48
When the crown 8 is rotated in the one-step pulling state of the winding stem 26, the quick adjusting claw 59 rotates together with the knob 31 in conjunction with the rotation of the winding stem 26. Then, the quick correction lever 58 is rotated about the boss 48b by engaging with the shape of the convex portion 58a provided on the quick correction lever 58. A return spring 58b is integrated with the quick-correction lever 58 so that a rotational force is always applied so that when the engagement between the quick-correction claw 59 and the shape of the convex portion 58a is released, the quick-return lever 58 returns to the rest position before operation. Have been. The return spring 58b is connected to the rotation center portion 58c of the quick correction lever 58.
And is integrally formed with a quick-correction lever body 58d having a shape substantially including the above, and constantly comes into contact with a stopper wall 48c (shown in FIG. 4) provided on the calendar plate 48 to obtain a return force. Further, the quick-correction lever 58 includes a feed pawl 58e for rotating the date intermediate wheel (2) 53 at least by 1/31 at a time in the above-mentioned fast-corrected state, and the feed pawl 58e is brought into a rest position before operation when the correction is completed. On the way back, Japan-China car (2) 5
A spring portion 58f is formed integrally with the feed claw 58e so as to have an elastic force so that the feed claw 58e does not reverse due to interference with the third claw 3.

The local time display wheel train 15 and the calendar mechanism described above are screwed together with the underlay 14 and the calendar plate 48 to the base plate 12 of the basic module via the back plate 57 having a shape substantially equivalent to the profile of the clock movement. By tightening at 60, the cross-sectional position is regulated.

[0039]

[Effects of the Invention] As described above, according to the present invention, the number of parts of the movement can be reduced, and the number of assembly steps can be reduced, thereby lowering the cost of the movement and realizing a lower price. The frame can be simplified, and as a result, the diameter of the watch size can be prevented from increasing, and interference between the escape hole of the hour wheel and the hour wheel provided on the dial, which has often been a problem in the past, and thread, etc. Therefore, a highly reliable multi-time display clock can be obtained.

Further, unlike the conventional multi-time display timepiece incorporating a plurality of movements, the position of the external operation member with respect to the position of the time difference display section is not restricted, so that a timepiece with good design can be obtained. At the same time, the hands for home time are longer than other time zones, so that a very effective effect was obtained, such as a display that is easy to see like a normal three-hand clock.

[Brief description of the drawings]

FIG. 1 is an external view of a timepiece showing an embodiment of the present invention.

FIG. 2 is a plan view of the left half of the timepiece movement showing the embodiment of the present invention as viewed from the back cover side.

FIG. 3 is a plan view of the right half of the timepiece movement showing the embodiment of the present invention as viewed from the back cover side.

FIG. 4 is a plan view of the left half of the timepiece movement showing the embodiment of the present invention, as viewed from the hands.

FIG. 5 is a plan view of the right half of the timepiece movement, showing the embodiment of the present invention, as viewed from the hands.

FIG. 6 is a sectional view of a main part of the wheel train mechanism of the timepiece of FIG. 1 according to the embodiment of the present invention;

FIG. 7 is a sectional view of a main part of the wheel train mechanism of the timepiece of FIG. 1 according to the embodiment of the present invention;

FIG. 8 is a sectional view of a main part of the wheel train mechanism of the timepiece of FIG. 1 according to the embodiment of the present invention;

[Explanation of symbols]

 1 hour hand 2 minute hand 3 second hand 4,5,6 Time difference display 4a, 5a, 6a Local time hour hand 4b, 5a, 6a Local time minute hand 8 Crown 9,10,11 Push button 25 Center car 29 minute notification wheel 36 Second Day wheel 36a Gear portion (1) 36b Gear portion (2) 36c Kana portion 37 Third day wheel 38 Dual second wheel (1) 39 Dual second wheel (2) 43 Dual wheel (1) 44, 45 Planetary wheel 46 Dual cylinder wheel (1) 49, 51 Dual correction lever 50 Return spring 52 Day wheel 55 Day wheel

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-251690 (JP, A) JP-A-60-70390 (JP, A) JP-A-62-255888 (JP, A) 118867 (JP, A) JP-A-53-33655 (JP, A) JP-A 63-58777 (JP, U) JP-A 50-74966 (JP, U) JP-A 58-30884 (JP, U)

Claims (3)

(57) [Scope of request for utility model registration] 1. A handwheel for driving said central hand in a wheel train structure of a timepiece capable of displaying multiple times by means of a hand substantially at the center of a display part and a secondary hand around said hand. A wheel train structure for a timepiece, comprising: a transmission wheel meshing with a vehicle, wherein the transmission wheel is meshed with a plurality of auxiliary hand drive vehicles capable of displaying at least two or more different times. 2. The hand wheel is a minute wheel, and the transmission wheel constitutes a second minute wheel that transmits the rotation of the minute wheel to the hour wheel. Item 2. The timepiece wheel train structure according to Item 1. 3. The secondary needle drive wheel is a dual second wheel, and constitutes a planetary gear for driving a dual hour wheel that rotates concentrically with the rotation center of the auxiliary needle drive wheel. The wheel train structure according to claim 1.