Abstract:
To provide a residual wound quantity display mechanism of a timepiece, in which it is possible to change a way of a display without changing a basic structure, and a timepiece with the mechanism concerned. A residual wound quantity display mechanism of a mechanical timepiece has an output gearwheel rotating in compliance with a change in a residual wound quantity of a mainspring; a drive lever possessing monolithically a fan-shaped gearwheel part meshing with the output gearwheel, and an arm part extending from a rotation center of the fan-shaped gearwheel part in a direction different from a fan-shaped portion of the fan-shaped gearwheel part; a display member possessing a drive gearwheel part rotatably supported to a tip part of the arm part of the drive lever, and a display arbor formed monolithically in the drive gearwheel part in a site separated from a rotation center of the drive gearwheel part; and a fixation gearwheel possessing a fixation tooth part with which a tooth part of the drive gearwheel part of the display member meshes. Typically the fixation gearwheel adopts a form of the internally-toothed gearwheel.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a residual wound quantity display mechanism of a timepiece, and a timepiece with the residual wound quantity display mechanism. 
         [0003]    2. Description of the Related Art 
         [0004]    In a timepiece in which at least one part of a drive source is a mainspring, there is proposed an attempt conceiving an idea in a display of a residual wound quantity or a power reserve quantity (residual mainspring-wound quantity or residual mainspring quantity) (e.g., Patent Documents JP-A-2005-214655 Gazette, JP-A-2006-234432 Gazette and JP-A-2006-234433 Gazette). 
         [0005]    JP-A-2005-214655 discloses about a residual wound quantity display mechanism made so as to display the residual mainspring quantity by driving a winding display wheel in a place separated from an output gearwheel rotating in compliance with a change in the residual wound quantity of the mainspring by using a gearwheel (here, called a segment gearwheel) possessing monolithically plural segments or sector gearwheel parts (fan-shaped gearwheel parts). 
         [0006]    By this, although a display region can be selected, a display itself is not different from a conventional arc-like or fan-shaped display and, from the fact that a center of the arc or fan in the display concerned exists in a range of a spread of the timepiece, it is difficult to cause a user who can see only an external appearance to feel a change (idea). 
         [0007]    Although JP-A-2006-234432 is one having a novelty in the display in a point that there is performed a display like a straight line, it is one in which a male thread and a female thread are combined for the display like the straight line, so that a display in a form other than the straight line is actually impossible. 
         [0008]    Although JP-A-2006-234433 differs from a conventional, general display in a point that there are performed both of a display of a 10-hour unit and a display of a time interval smaller than the former, there is no difference from the conventional, general display in a point that display hands are rotated about each center. 
       SUMMARY OF THE INVENTION 
       [0009]    It is an aspect of the present invention to provide a residual wound quantity display mechanism of a timepiece, in which it is possible to change a way of the display without changing a basic structure, and a timepiece with the mechanism concerned. 
         [0010]    In order to achieve the above aspect, a residual wound quantity display mechanism of a timepiece of the present invention has an output gearwheel rotating in compliance with a change in a residual wound quantity of a mainspring; a drive lever possessing monolithically a fan-shaped gearwheel part meshing with the output gearwheel, and an arm part extending from a rotation center of the fan-shaped gearwheel part in a direction different from a fan-shaped portion of the fan-shaped gearwheel part; a display member possessing a drive gearwheel part rotatably supported to the arm part of the drive lever, and a display arbor formed monolithically in the drive gearwheel part in a site separated from a rotation center of the drive gearwheel part; and a fixation gearwheel possessing a fixation tooth part with which a tooth part of the drive gearwheel part of the display member meshes. 
         [0011]    In the residual wound quantity display mechanism of the timepiece of the present invention, by having the above structure or constitution, a rotation of the output gearwheel, which complies with a change in the residual wound quantity of the mainspring, is converted into a rotation of the drive lever, which complies with the former rotation, further the rotation of the drive lever is converted into a rotation of the drive gearwheel part, and additionally the rotation of the drive gearwheel part is displayed finally as a locus of a display arbor. 
         [0012]    Incidentally, typically, the display arbor protrudes to a front face side of a dial while penetrating through a slit (shape of the locus) formed in the dial, and displays the residual wound quantity (mainspring residual quantity or power reserve quantity) in regard to a residual quantity display graduation formed along the slit concerned in the dial. Typically, a residual wound quantity display plate is attached to a protruded end of the display arbor. 
         [0013]    In such a residual wound quantity display mechanism of the timepiece of the present invention as mentioned above, the locus of the display arbor is a cycloid or trochoid in abroad sense. In a case where the fixation gearwheel is like a convex, i.e., an externally-toothed gearwheel, the locus of the display arbor becomes an external trochoid (epitrochoid) and, in a case where the fixation gearwheel is like a concave, i.e., an internally-toothed gearwheel (internal gearwheel), the locus of the display arbor becomes an internal trochoid (hypotrochoid) In a case where a distance from the display arbor till the rotation center of the drive gearwheel part coincides with a radius of a pitch circle of the drive gearwheel part, the external trochoid and the internal trochoid become respectively an external cycloid (epicycloid) and an internal cycloid (hypocycloid). In a case where the fixation gearwheel is a rack tooth like a straight line, the locus of the display arbor becomes a cycloid in a narrow sense. 
         [0014]    Accordingly, by setting the distance from the display arbor till the rotation center of the drive gearwheel part to a desired dimension different from the radius of the pitch circle of the drive gearwheel part, it becomes possible that the locus of the display arbor can be made not only like a curve which is convex outward in regard to the timepiece as the prior art for instance, but also like the straight line or also like a curve which is convex inward in regard to the timepiece, and further it becomes also possible to change a radius of curvature of the arc-like curve. Here, “arc-like” may be curve-like (pseudo-arc-like) approximating to an arc when seen roughly, instead of a strict arc whose radius of curvature is constant. Incidentally, from the fact that the display arbor suffices if it expresses a locus of one portion among the above-mentioned loci, in a case where, e.g., the hypotrochoid has a portion capable of being approximated to the straight line not under a condition becoming strictly the straight line, it is also possible to perform a straight-line-like display by utilizing that portion. 
         [0015]    Incidentally, in the above, as to the above arm part of the drive lever, the fact that a direction is “different from a fan-shaped portion of the fan-shaped gearwheel part” means the fact that the above arm part of the drive lever is formed separately from an arm part comprising the fan-shaped portion of the fan-shaped gearwheel. Further, in the drive gearwheel part, although one part of the arc becomes typically an arm part for attaching the display arbor not a complete circle, if desired, it may be the complete circle. In that case, the arm part for attaching the display arbor is provided protrusively from the drive gear part like an S-shape for instance, and formed in a position deviated in a thickness direction of the drive gearwheel part. 
         [0016]    In a residual wound quantity display mechanism of a timepiece of the present invention, the fixation gearwheel typically comprises an internally-toothed gearwheel (internal gearwheel). By this, a novel display, such as the straight-line display (there may a pseudo-straight-line-like display) or a display like a curve internally convex when seen from a dial side of the timepiece, becomes possible. However, in the residual wound quantity display mechanism of the timepiece of the present invention, if desired, the fixation gearwheel may be an externally-toothed gearwheel (external gearwheel). 
         [0017]    Further, in a residual wound quantity display mechanism of a timepiece of the present invention, a distance from the display arbor till the rotation center of the drive gearwheel part is, e.g., smaller than a radius of a pitch circle of the drive gearwheel part. 
         [0018]    In that case, it is possible to give the novel display in comparison with the prior art. That is, e.g., such a display is possible that the locus (display by the display arbor) of the display arbor is like a pseudo-straight line, or that a center of the arc (pseudo-arc), which is internally convex and whose radius of curvature is comparatively large, is placed in an outside than the timepiece or a movement. 
         [0019]    Further, in a residual wound quantity display mechanism of a timepiece of the present invention, a distance from the display arbor till the rotation center of the drive gearwheel part may be, e..g., larger than a radius of a pitch circle of the drive gearwheel part. 
         [0020]    In that case, it is liable to become the novel display in comparison with the prior art and, for example, the locus formed by the display arbor is like the arc, and such a display is possible that the center of the arc is placed in the outside than the timepiece or the movement. 
         [0021]    If prescribed in another viewpoint, in the residual-wound quantity display mechanism of the timepiece of the present invention, by changing a ratio between the radius of the pitch circle of the drive gearwheel part and a radius of a pitch circle of the fixation gearwheel part, the locus can be altered to a desired form. 
         [0022]    For example, in the residual wound quantity display mechanism of the timepiece of the present invention, the radius of the pitch circle of the drive gearwheel part is ½ of the radius of the pitch circle of the fixation gearwheel part, and the distance from the display arbor till the rotation center of the drive gearwheel part is equal to the radius of the pitch circle of the drive gearwheel part. In that case, the locus of the display arbor becomes literally the straight line. 
         [0023]    Further, in a residual wound quantity display mechanism of a timepiece of the present invention, typically, a rotation center of the drive lever exists inside a region prescribed by a line connecting the fixation gearwheel and the output gearwheel. In that case, the locus of the display arbor is displayed in a side in a diameter direction, which is approximately reverse to a position of the output gearwheel. 
         [0024]    However, instead of it, in a residual wound quantity display mechanism of a timepiece of the present invention, a rotation center of the drive lever may exist outside a region prescribed by a line connecting the fixation gearwheel and the output gearwheel. In that case, the locus of the display arbor is displayed laterally (e.g., such a position as being different by about 90 degrees) in regard to the position of the output gearwheel. 
         [0025]    In the above, in order to lengthen a length of the arm part of the drive lever etc., at its maximum, the drive lever is disposed such that its rotation center is placed typically in a center of the timepiece or the movement, or its vicinity. However, in order to cause a component concerning the residual wound quantity display mechanism to locally exist in a region of one part of the timepiece or the movement or give a change in a direction of the display, the rotation center of the drive lever may be provided in a place separated from the center of the timepiece or the movement. Similarly, in a case where the fixation gearwheel comprises the internally-toothed gearwheel (internal gearwheel), typically, although the fixation gearwheel is disposed near an outer periphery of the timepiece or the movement, if desired, it may be disposed in a center part of the timepiece or the movement. 
         [0026]    Further, in the above, typically, the drive lever and the fixation gearwheel are supported by a stationary support body of a main plate or other. However, if desired, in order to indicate at least one between the drive lever and the fixation gearwheel, an exclusive stationary support body may be provided. Here, the stationary support body means one supporting a timepiece component while being disposed stationary in regard to a case of the timepiece, like the main plate. 
         [0027]    In order to achieve the above aspect, a timepiece with a residual wound quantity display mechanism of the present invention possesses the residual wound quantity display mechanism like the above. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0028]      FIG. 1  is an explanatory plan view of a mechanical timepiece possessing a residual wound quantity display mechanism of one desirable embodiment of the present invention. 
           [0029]      FIG. 2  is an explanatory sectional view showing linkages among a barrel drum and a planetary unit as well as a drive lever of the residual wound quantity display mechanism within the mechanical timepiece of  FIG. 1 . 
           [0030]      FIG. 3  is an explanatory sectional view showing mainly a portion of the residual wound quantity display mechanism of the mechanical timepiece of  FIG. 1 . 
           [0031]      FIG. 4  is a partially enlarged explanatory plan view of the residual wound quantity display mechanism existing in an initial state, which shows an operation state of the residual wound quantity display mechanism of  FIG. 1 . 
           [0032]      FIG. 5  is a partially enlarged explanatory plan view similar to  FIG. 4 , about the residual wound quantity display mechanism of  FIG. 1 , which exists under a state in which one part of a mainspring was unwound. 
           [0033]      FIG. 6  is a partially enlarged explanatory plan view similar to  FIG. 4 , about the residual wound quantity display mechanism of  FIG. 1 , which exists under a state in which a half degree of the mainspring was unwound. 
           [0034]      FIG. 7  is a partially enlarged explanatory plan view similar to  FIG. 4 , about the residual wound quantity display mechanism of  FIG. 1 , which exists under a state in which a majority of the mainspring was unwound. 
           [0035]      FIG. 8  is a partially enlarged explanatory plan view similar to  FIG. 4 , about the residual wound quantity display mechanism of  FIG. 1 , which exists under a state in which the mainspring was completely unwound. 
           [0036]      FIG. 9  is an explanatory plan view in which the mechanical timepiece of  FIG. 1  was seen from a dial side. 
           [0037]      FIG. 10  is an explanatory plan view similar to  FIG. 1 , about a mechanical timepiece possessing a residual wound quantity display mechanism of one another, desirable embodiment of the present invention. 
           [0038]      FIG. 11  is an explanatory sectional view similar to  FIG. 3 , about the mechanical timepiece of  FIG. 10 . 
           [0039]      FIG. 12  is an explanatory plan view similar to  FIG. 9 , about the mechanical timepiece of  FIG. 10 . 
           [0040]      FIG. 13  is an explanatory plan view similar to  FIG. 1 , about a mechanical timepiece possessing a residual wound quantity display mechanism of one still another, desirable embodiment of the present invention. 
           [0041]      FIG. 14  is an explanatory plan view similar to  FIG. 9 , about the mechanical timepiece of  FIG. 13 . 
           [0042]      FIG. 15  is an explanatory plan view similar to  FIG. 1 , about a mechanical timepiece possessing a residual wound quantity display mechanism of one still another, desirable embodiment of the present invention. 
           [0043]      FIG. 16  is an explanatory plan view similar to  FIG. 9 , about the mechanical timepiece of  FIG. 15 . 
           [0044]      FIG. 17  is an explanatory plan view similar to  FIG. 1 , about a mechanical timepiece possessing a residual wound quantity display mechanism of one still another, desirable embodiment of the present invention. 
           [0045]      FIG. 18  is a partially enlarged explanatory plan view similar to FIG.  4 .- FIG. 8 , about an operation state of the residual wound quantity display mechanism of  FIG. 17 . 
           [0046]      FIG. 19  is an explanatory sectional view similar to  FIG. 3 , about the mechanical timepiece of  FIG. 17 . 
           [0047]      FIG. 20  is an explanatory sectional view similar to  FIG. 9 , about the mechanical timepiece of  FIG. 17 . 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0048]    Some of desirable implementation modes of the present invention are explained on the basis of desirable embodiments shown in the appended drawings. 
       Embodiment 1 
       [0049]    In  FIG. 1-FIG .  3 , there is shown a main body part or a movement  3  of a mechanical timepiece  2  possessing a residual wound quantity display mechanism  1  of one desirable embodiment of the present invention. 
         [0050]    As shown in  FIG. 2 , the movement  3  of the timepiece  2  possesses a barrel drum  10  and, as understood from  FIG. 1 , the residual wound quantity display mechanism  1  has a planetary wheel mechanism or a planetary unit  100  and a residual wound quantity display mechanism main body part  5 . In this example, the movement  3  includes, as stationary support bodies, a main plate  21 , a barrel bridge  22 , and main plate  23 , a 2nd train wheel bridge  24 , a center wheel bridge  25  ( FIG. 3 ), and the like. 
         [0051]    The barrel drum  10  possesses in its inside a mainspring  11 , and the mainspring  11  is wound in compliance with a rotation of a ratchet wheel  14  fixed to a barrel arbor  13  by a ratchet wheel screw  12 . When winding the mainspring  11 , a barrel arbor pinion  15  attached to the barrel arbor  13  is rotated and, when unwinding the mainspring  11 , a barrel pinion  16  is rotated together with a barrel gearwheel  17 . 
         [0052]    The planetary unit  100  has a 1st sun wheel  110  possessing a 1st sun gearwheel  111  meshing with the barrel pinion  16  and a 1st sun pinion  112 ; a 2nd sun wheel  120  which possesses a 2nd sun gearwheel  121  and a 2nd sun pinion  122  and is coaxial with the 1st sun wheel  110 ; a planetary intermediate wheel  130  which possesses a planetary intermediate gearwheel  131  and spacers  132 ,  132  ( FIG. 1 ) and is coaxial with the 1st and 2nd sun wheels  110 ,  120 ; and a planetary wheel  140  comprising a 1st planetary gearwheel  141  meshed with the 1st sun pinion  112  and rotatably supported to the planetary intermediate wheel  130 , and a 2nd planetary gearwheel  142  which is meshed with the 2nd sun pinion  122 , coaxial with the 1st planetary gearwheel  141 , and whose diameter is smaller than the 1st planetary gearwheel. The planetary intermediate gearwheel  131  is meshed with the barrel arbor pinion  15  through a planetary transmission wheel  150 . The planetary transmission wheel  150  comprises a planetary transmission gearwheel  151  meshed with the planetary intermediate gearwheel  131 , and a planetary transmission pinion  152  monolithic with the planetary intermediate gearwheel. 
         [0053]    Accordingly, in compliance with an A-direction rotation of the barrel arbor pinion  15 , which follows upon the winding of the mainspring  11 , the 2nd sun gearwheel  121  of the planetary unit  100  is rotated in a B 2 -direction and, in compliance with the A-direction rotation of the barrel pinion  16 , which follows upon the unwinding of the mainspring  11 , the 2nd sun gearwheel  121  of the planetary unit  100  is rotated in a B 1 -direction. Here, the 2nd sun gearwheel  121  of the planetary unit  100  acts as an output gearwheel of the residual wound quantity display mechanism  1 . So long as the output gearwheel of the residual wound quantity display mechanism  1  is rotated in reverse directions in compliance with the winding and the unwinding of the mainspring  11 , there may be any other one instead of the 2nd sum wheel  121  of the planetary unit  100 . 
         [0054]    Incidentally, as shown in  FIG. 3 , the movement  3  of the mechanical timepiece  2  possesses coaxially an hour wheel  31 , a cannon pinion  37 , a center wheel &amp; pinion  32  and a second wheel &amp; pinion  33 , and an hour hand  34 , a minute hand  35  and a second hand  36  are attached respectively to the wheels  31 ,  32  and  37 . Accordingly, in compliance with the unwinding of the mainspring. 11 , the hour wheel  31 , the center wheel &amp; pinion  32  and the second wheel &amp; pinion  33  are rotated through a train wheel (not shown in the drawing) including the cannon pinion  37 , and a time instant is displayed by the hour hand  34 , the minute hand  35  and the second hand  36 , which rotate in a front face of a dial  7 . 
         [0055]    As understood mainly from  FIG. 1 , the main body part  5  of the residual wound quantity display mechanism  1  possesses a drive lever  40  supported to the 2nd main plate  23  ( FIG. 3 ) so as to be rotatable in D 1 - and D 2 -directions about a rotation axle  41 , a display member  50  supported to the drive lever  40  so as to be rotatable in E 1 - and E 2 -directions about a rotation axle  51 , and a fixation gearwheel  70  fixed to the 2nd main plate.  23  ( FIG. 3 ). Hereunder, a rotation center axis of the rotation axle  41  is denoted by D, and a rotation center axis of the rotation axle  51  is denoted by E. 
         [0056]    The drive lever  40  possesses a short arm part  42  in one side of the rotation axle  41 , and possesses a long arm part  43  in an approximately diameter direction reverse side (in more detail, a direction slanting by about 150 degrees-170 degrees in regard to the arm part  42 ) in regard to the arm part  42 . In this example, the drive lever  40  is made rotatable about the center axis D in regard to the 2nd main plate  23  by being fitted in a rotation axle reception hole  47  to the rotation axle  41  formed by an annular convex part of the 2nd main plate  23 . By this, a center of the mechanical timepiece  2  can be made the rotation center axis D of the drive lever  40 . However, in a case where the drive lever  40  is disposed in a place deviated from the center of the timepiece  2 , if desired, the rotation axle  41  of the drive lever  40  may be made an axle part monolithic with the arms  42 ,  43  and the like, and a hole part rotatably supporting the axle part may be previously formed in the stationary support body. Further, in this example, the 2nd main plate  23  has a concave part  26  rotatably receiving the drive lever  40 . In an end edge of the short arm part  42 , there is formed a fan-shaped gearwheel part (i.e., a sector gearwheel part or a segment gearwheel part)  44  meshing with the 2nd sun gearwheel  121  as an output gearwheel. In a vicinity of a tip part of the long arm part  43 , the display member  50  is rotatably supported through the rotation axle  51 . Incidentally, an angle determination pin  45  implanted to the 2nd main plate  23  regulates a rotation range of the drive lever  40  in the D 2 -direction, thereby prescribing an initial position of the drive lever  40 . 
         [0057]    In this example, the fixation gearwheel  70  comprises an arc-like internally-toothed gearwheel (internal gearwheel)  71  in which a radius of a pitch circle is R 1 . A center of the pitch circle of the fixation gearwheel  71  coincides with the rotation center axis D. 
         [0058]    The display member  50  has a drive gearwheel part  52  possessing an arc-like pitch circle of a radius R 2  with the rotation center axis E being made a center, and a display arbor  55  attached to a tip part  54  of a display arm part  53  extending in a diameter direction reverse direction in regard to the drive gearwheel part  52  from a place of the rotation axle  51  of the drive gearwheel part  52 . In this example, the 2nd main plate  23  possesses an arc-like groove part  27  receiving a protruded end part of the rotation axle  51  of the drive gearwheel part  52  and allowing an arc-like movement of the protruded end part. 
         [0059]    A distance between a center F of the display arbor  55  and the rotation center axis E is R 3 . In more detail, as understood from  FIG. 3 , in this example, the display member  50  has display arbor attachment holes  57 ,  57 A in the arm part  53 . The display arbor attachment hole  57 A is placed near the rotation center axis E, and the display arbor attachment hole  57  exists in a place separated from the rotation center axis E than the hole  57 A. In the example of  FIG. 1-FIG .  3 , the display arbor  55  is fitted to the display arbor attachment hole  57 . In the dial  7 , there is formed a slit  56  along a locus of the center F of the display armor  55 , and the display armor  55  extends in a thickness direction of the timepiece  2  while penetrating through the slit  56  of the dial  7 . A residual quantity display plate  61  is attached to an end part extending to a front face, side of the dial  7  within the display armor  55 . 
         [0060]    The center axes D, E, F are all perpendicular to a main face of the timepiece  2  or an extending face of the dial  7 . In this example, there is made R 3 &gt;R 2 . 
         [0061]    In the main body part  5  of the residual wound quantity display mechanism  1  constituted like the above, a locus of the center, i.e., the motion point F, of the display arbor  55  becomes the internal trochoid (hypotrochoid). Here, the radius of a constant circle is R 1 , the radius of a motion circle is R 2 , and the distance from the motion point F till the rotation center E is R 3 . 
         [0062]    Under a full wound state S 1  in which the mainspring  11  is fully wound, the residual wound quantity display mechanism  1  constituted like the above takes an initial state shown in  FIG. 1 . Under this initial state or full wound state, as to the drive lever  40 , its side edge  46  of the short arm part  42  butts against the angle butting pin  45 , thereby adopting a position P 1  in Which a D 2 -direction rotation more than it is prohibited. As understood from  FIG. 1  and  FIG. 4  in which one part of the former is shown while being enlarged, under this full wound state S 1 , the display member  50  adopts, as an initial position Q 1 , a D 2 -direction extreme position in which its drive gearwheel part  52  meshes with a D 2 -direction end part  73  of the fixation gearwheel  70 , the arm part  53  of the display member  50  topples in the E 2 -direction, and the center F of the display arbor  55  adopts a G 2 -direction extreme position as an initial position U 1 . 
         [0063]    If the 2nd sun gearwheel  121  is rotated in the B 1 -direction in accordance with an operation of the planetary unit  100  complying with the unwinding of the mainspring  11  and, if the drive lever  40  is rotated in the D 1 -direction as shown in  FIG. 5  in compliance with the B 1 -direction rotation-of the 2nd sun wheel  121  and arrives at a position P 2 , the drive gearwheel part  52  of the display member  50  rolls in the D 1 -direction along the fixation gearwheel  70  as shown in  FIG. 5  in compliance with the D 1 -direction rotation of the drive lever  40  and arrives at a position Q 2 . The display member  50  is rotated, on the occasion of its D 1 -direction rolling, in the E 1 -direction about the center axis E as shown in  FIG. 5 . As a result, as shown in  FIG. 5 , the center F of the display arbor  55  swings in a G 1 -direction along a locus G forming a hypotrochoidal curve and arrives at a position U 2 . 
         [0064]    As shown in  FIG. 6 , in compliance with an additional unwinding of the mainspring  11 , if the drive lever  40  arrives at a position P 3 , the drive gearwheel part  52  of the display member  50  arrives at a position Q 3 , and the center F of the display arbor  55  additionally swings in the G 1 -direction along the locus G forming the hypotrochoidal curve and arrives at a position U 3 . 
         [0065]    Additionally, as shown in  FIG. 7 , in compliance with the unwinding of the mainspring  11 , if the drive lever  40  arrives at a position P 4 , the drive gearwheel part  52  of the display member  50  arrives at a position Q 4 , and the center F of the display arbor  55  swings in the G 1 -direction along the locus G forming the hypotrochoidal curve and arrives at a position U 4 . 
         [0066]    As shown in  FIG. 8 , if the mainspring  11  is loosen by actually, completely performing the unwinding, the drive lever  40  arrives at a final position P 5 , the drive gearwheel part  52  of the display member  50  arrives at a final position Q 5 , and the center F of the display arbor  55  swings in the G 1 -direction along the locus G forming the hypotrochoidal curve and arrives at a final position U 5 . 
         [0067]    Accordingly, as understood from  FIG. 8 , in compliance with the unwinding of the mainspring  11 , the center F of the display arbor  55  moves from the position U 1  to the final position U 5  along the hypotrochoidal curve G while passing the positions U 2 , U 3 , U 4 . 
         [0068]    When winding the mainspring  11 , in compliance with the winding of the mainspring  11 , the center F of the display arbor  55  returns from the position U 5  to the initial position U 1  along the hypotrochoidal curve G while passing the positions U 4 , U 3 , U 2 . 
         [0069]    Accordingly, as shown in  FIG. 9 , the residual quantity display plate  61  moves in the G 1 - and G 2 -directions along the slit  56  in a form of the hypotrochoidal curve G, which is formed in the dial  7 . In  FIG. 9 , in the dial  7  there is applied a mainspring residual quantity graduation  62  along the slit  56  with the full wound position U 1  corresponding to the full wound state S 1  being made a 50-hour, and the residual quantity zero position U 5  corresponding to a state S 5  of a completely loosen residual quantity zero being made 0. A reference numeral  8  denotes a crown utilized in the winding of the mainspring  11 . Incidentally, the main spring  11  may possess an automatic winding mechanism (not shown in the drawing) as well and, further, there may be made so as to be wound only by the automatic winding mechanism. 
         [0070]    As understood from the movement slit  56  and the residual quantity graduation  62  of the residual quantity display plate  61  in the mechanical timepiece  2  of  FIG. 9  and the locus G of  FIG. 8 , in this mechanical timepiece  2 , the slit  56  has such an ark-like (In more detail, pseudo-arc-like or substantially arc-like) shape that its center exists outside the case  9  or outside the movement  3  of the timepiece  2 . 
         [0071]    Next, about a residual wound quantity display mechanism  1 A of a modified example of the present invention, in which there is made so as to be capable of performing a straight-line-like display instead of the arc-like display, and a mechanical timepiece  2 A possessing the mechanism  1 A concerned, there are explained on the basis of  FIG. 10-FIG .  12  and  FIG. 4-FIG .  8 . 
         [0072]    As understood from  FIG. 10 , the residual wound quantity display mechanism  1 A of this modified example has a display arbor  55 A in the vicinity of the rotation center E of the display member  50 . That is, in this example, the display arbor  55 A is fitted to a display arbor attachment hole  57 A placed in the vicinity of the rotation center E instead of the display arbor attachment hole  57  of the display member  50 . A distance (separated-center-length) R 3 A between a center FA of the display arbor  55 A and the rotation center E of the display member  50  is small in comparison with the radius R 2  of the pitch circle of the drive gearwheel  52  (R 3 A/R 2 &lt;&lt;1). 
         [0073]    Incidentally, in more detail, for example, the separated-center length R 3 A is selected such that a distance H (more strictly, one in which a ratio ((R 1 −R 2 )/R 1 ) between a distance (R 1 -R 2 ) from the center axis D till the center axis E and the radius R 1  of the pitch circle of the fixation gearwheel  70  is multiplied) between&lt;&lt;a virtual line V connecting a mesh position J 1  in which the drive gearwheel  52  meshes with the fixation gearwheel  70  when existing in the initial position Q as shown in  FIG. 10  and  FIG. 4  and a mesh position J 5  in which it meshes with the fixation gearwheel  70  when existing in an end point position Q 5  as shown in FIG.  8 &gt;&gt;and &lt;&lt;a mesh position J 3  in which it meshes with the fixation gearwheel  70  when existing in the intermediate position Q 3 &gt;&gt;becomes the same degree as a difference between “the separated-center length R 3 A of the display arbor  55 A” and “a distance K (where, a distance in a direction perpendicular to the above virtual line V) between a position U 1 A that a center FA of the display arbor  55 A takes when the drive gearwheel part  52  exists in the initial position Q 1  as shown in  FIG. 10  and  FIG. 4  and the rotation center E″. If denoted by an expression, 
         [0000]        H *( R 1 −R 2)/ R 1 ≅R 3 A−K    
         [0074]    However, here, there is supposed a case where the drive gearwheel part  52  adopts, in a case where it exists in the initial position Q 1  and a case where it exists in the end point position Q 5 , a state symmetrical to a virtual line which is perpendicular to the above virtual line V and passes the center D. 
         [0075]    In other words, by depicting a locus (not shown in the drawing) of the rotation center E of the display member  50 , and selecting the R 3 A such that a maximum distance (In different words, there may be said a distance between the F (FA) and the E in  FIG. 6  or a distance between the G and the E in a neutral position) from the line (G) connecting the U 1  and the U 5  so as to become equal to the R 3 A, a locus of pseudo-straight line is obtained. 
         [0076]    In  FIG. 10 ,  FIG. 11  and  FIG. 12 , the same reference numeral or sign is applied to a member or element similar to  FIG. 1 ,  FIG. 3  and  FIG. 9  and, as to a member or element in which there is an alteration, an annexed letter A is applied to a tail of the reference numeral or sign of a corresponding member or element. 
         [0077]    Like the above, in the residual wound quantity display  0 mechanism  1 A in which the display armor  55 A is attached to a hole  57 A of a display member  50 A and a residual quantity display plate  61 A is attached to a tip of the display arbor  55 A, in compliance with the E 1 -direction rotation of the drive gearwheel  52 , which complies with the D 1 -direction rotation, of drive lever  40 , following upon the unwinding of the mainspring  11 , the center FA of the display arbor  55 A displaces like the pseudo-straight line (practically like the straight line) in a GA 1  direction from, as shown in  FIG. 4  to  FIG. 8 , an initial position U 1 A ( FIG. 4 ) till a final position U 5 A ( FIG. 8 ) while passing a position U 2 A ( FIG. 5 ), a position U 3 A ( FIG. 6 ) and a position U 4 A ( FIG. 7 ) along a locus GA. When winding the mainspring  11 , there displaces like the pseudo-straight line to the positions U 5 A, U 4 A, U 3 A, U 2 A, U 1 A in a reverse direction GA 2  along the locus GA. 
         [0078]    Like this, only by altering the position in which the display arbor  55  or  55 A is attached in regard to the arm part  53  of the display member  50 , the locus that the display arbor  55  depicts can be altered from like the pseudo-arc to like the pseudo-straight line. 
         [0079]    Accordingly, as shown in  FIG. 12 , in the mechanical timepiece  2 A possessing this residual wound quantity display mechanism  1 A, it possesses a straight-line-like slit  56 A corresponding to the locus GA, and the display arbor  55 A and the residual quantity display plate  61 A are displaced practically like the straight line in the GA 1 - and GA 2 -directions along the straight-line-like slit  56 A in compliance with the unwinding and the winding of the mainspring  11 . 
         [0080]    Incidentally, in the wound quantity display mechanism  1 A of a movement  3 A in the mechanical timepiece  2 A of the embodiment shown in  FIG. 10-FIG .  12 , from the fact that the display arbor  55 A and the residual quantity display plate  61 A are displaced in a sufficiently small range in comparison with the radius R 1  of the pitch circle of the fixation gearwheel  70 , although that displacement can be approximated by the straight line, in order to make such that the display arbor  55 A and the residual quantity display plate  61 A are displaced like the straight line over a range of a considerable degree in comparison with the radius R 1  of the pitch circle of the fixation gearwheel  70 , there suffices if there is made such that two times of the radius R 2  of the pitch circle of the drive gearwheel part  52  coincide with the radius R 1  of the pitch circle of the fixation gearwheel  70  in accordance with a hypotrochoidal or hypocycloidal curve, and if the attachment hole  57 A of the display arbor  55 A is formed in the display member  50 A such that the center FA of the display arbor  55 A becomes a position separated from the center axis E by the distance R 2 . In that case, in order to make such that the slit  56 A is placed, as shown in  FIG. 12 , in an outer periphery vicinity of the dial  7  not in a center part of the dial  7 , there suffices if the rotation center axis D of the drive lever  40  is made a position (in mentioning about the example of  FIG. 12 , a position deviated to a side of 6 o&#39;clock from the center) deviated from the center of the timepiece case  9 . 
         [0081]    Incidentally, even in a case where a disposition of the planetary unit  100  is difficult to be altered by being regulated by dispositions of other components constituting the movement, a display position of the residual wound quantity by the residual quantity display plate can be altered. 
         [0082]    The example of  FIG. 1-FIG .  9  and the example of  FIG. 10-FIG .  12  are all examples of the hypotrochoid. Accordingly, generally, by considering a direction of the display arbor  55  in  FIG. 1  for instance, the locus G (X, Y) is denoted as 
         [0000]        X =( R 1 −R 2)cos θ− R 3 cos(( R 1 −R 2)θ/ R 2) 
         [0000]        Y =( R 1 −R 2)sin θ+ R 3 sin(( R 1 −R 2)θ/ R 2) 
         [0000]    Where, the X, Y are orthogonal coordinates with the rotation center of the drive lever  40  being made an origin as shown in  FIG. 1 , and a direction (in  FIG. 1 , a direction connecting the center D of the fixation lever  40  and a middle point (the position J 3  in  FIG. 10 ) of the fixation gear wheel  70 ) along which the arm part  43  extends in the position P 3  of  FIG. 6  corresponds to +X direction. The θ is a counterclockwise angle of the arm part  43  of the drive lever  40  and, when there exists in the position P 3  of  FIG. 6 , θ=0 degree. Further, as mentioned later, in a case where the fixation gearwheel comprises the externally-toothed gearwheel (external gearwheel), there suffices if there is differently read as R 1 −R 1  and X→−X and Y→−Y. 
         [0083]    In  FIG. 13  and  FIG. 14 , there is shown an example in which there is made such that, in a case where the planetary unit  100  exists in a 12 O&#39;clock position, the residual wound quantity is arc-like-displayed in a 9&#39;oclock position. That is, in a mechanical timepiece  2 B possessing a residual wound quantity display mechanism  1 B shown in  FIG. 13  and  FIG. 14 , it differs from the mechanical timepiece  2  possessing the residual wound quantity display mechanism  1  shown in  FIG. 1-FIG .  9  in a point that the arc-like display is performed in the 9 o&#39;clock position instead of the 6 o&#39;clock position and, in other points, there is constituted similarly to the mechanical timepiece  2  possessing the residual wound quantity display mechanism  1  shown in  FIG. 1-FIG .  9 . 
         [0084]    In  FIG. 13  and  FIG. 14 , the same reference numeral or sign is applied to a member or element which is the same as the member or element shown in  FIG. 1-FIG .  9  and, as to a member or element which corresponds although having a different point, an annexed letter B is applied to an end of the reference numeral or sign. 
         [0085]    In the residual wound quantity display mechanism  1 B of a movement  3 B of the mechanical timepiece  2 B, a drive lever  40 B has the short arm part  42 , and a long arm part  43 B forming an angle of about 75 degrees in regard to the arm part  42  concerned. In other words, the drive lever  40 B differs from the drive lever  40  in a point that the arm part  43 B exists in an angular position deviated clockwise by 90 degrees in regard to the arm part  43  of the drive lever  40  and, in other points, it is constituted actually the same as the drive lever  40 . That is, in this example, differing from the examples of  FIG. 1  to  FIG. 12 , in which the rotation center D of the drive lever  40  exists inside a region prescribed by a line connecting the fixation gearwheel  70  and the output gearwheel  121 , a rotation center of the drive lever  40 B exists outside the region prescribed by a line connecting a fixation gearwheel  70 B and the output gearwheel  121 . Incidentally, in this example, an angle of the drive lever  40 B and the arm part  43 B may be bent at an acute angle or bent at an obtuse angle instead of being bent by about 90 degrees, and a direction of the acute angle or the obtuse angle may exist in a 3 o&#39;clock side instead of a 9 o&#39;clock side. 
         [0086]    A relative position of a display member  50 B in regard to the long arm part  43 B of the drive lever  40 B is the same as a relative position of the display member  50  in regard to the long arm part  43  of the drive lever  40 . Accordingly, the display member  50 B differs from the display member  50  in a point that it exists in an angular position deviated clockwise by 90 degrees in regard to the display member  50  of  FIG. 1-FIG .  9  and, in other points, it is constituted actually the same as the display member  50 . Similarly, a relative position of the fixation gearwheel  70 B in regard to the long arm part  43 B of the drive lever  40 B is the same as a relative position of the fixation gearwheel  70  in regard to the long arm part  43  of the drive lever  40 . Accordingly, the fixation gearwheel  70 B differs from the fixation gearwheel  70  in a point that it exists in an angular position deviated clockwise by 90 degrees in regard to the fixation gearwheel  70  of  FIG. 1-FIG .  9  and, in other points, it is constituted actually the same as the fixation gearwheel  70 . 
         [0087]    Further, in comparison with the display arbor  55  or the slit  56  or the residual quantity display plate  61  of  FIG. 1-FIG .  9 , also a display arbor  55 B or a slit  56 B or a residual quantity display plate  61 B differs in a point that it exists in the angular position deviated clockwise by 90 degrees and, in other points, it is constituted actually the same. Incidentally, a point that also a residual quantity display graduation  62 B exists in an angular position deviated clockwise by 90 degrees in regard to the residual quantity display graduation  62 B is the same as other elements. However, in the residual quantity display graduation  62 B, numerical values of the graduation are applied in such a direction that it is easy to confirm visually an ordinary timepiece display in which the 6 o&#39;clock position becomes below and the 12 o&#39;clock position becomes above. 
         [0088]    In this mechanical timepiece  2 B, the residual wound quantity is displayed by the fact that the residual quantity display plate  61 B displaces in GB 1 - and GB 2 -directions along the inward arc-like slit  56 B extending along a locus GB in the 9 o&#39;clock position. 
         [0089]    In  FIG. 15  and  FIG. 16 , there is shown an example in which there is made such that, in a case where the planetary unit  100  exists in the 12 o&#39;clock position, the residual wound quantity is displayed like the straight line in the 9 o&#39;clock position. That is, in a mechanical timepiece  2 C possessing a residual wound quantity display mechanism  1 C shown in  FIG. 15  and  FIG. 16 , it differs from the mechanical timepiece  2 A possessing the residual wound quantity display mechanism  1 A shown in  FIG. 10-FIG .  12  in a point that the arc-like display is performed in the 9 o&#39;clock position instead of the 6 o&#39;clock position and, in other points, it is constituted similarly to the mechanical timepiece  2 A possessing the residual wound quantity display mechanism  1 A shown in  FIG. 10-FIG .  12 . Further, in the mechanical timepiece  2 C possessing the residual wound quantity display mechanism  1 C shown in  FIG. 15  and  FIG. 16 , it differs from the mechanical timepiece  2 B possessing the residual wound quantity display mechanism  1 B shown in  FIG. 13-FIG .  14  in a point that the straight-line-like display is performed and, in other points, it is constituted similarly to the mechanical timepiece  2 B possessing the residual wound quantity display mechanism  1 B shown in  FIG. 13-FIG .  14 . 
         [0090]    In  FIG. 15  and  FIG. 16 , the same reference numeral or sign is applied to the member or element shown in  FIG. 1-FIG .  9  or  FIG. 10-FIG .  12  or  FIG. 13-FIG .  14  and, to a member or element which corresponds although having a different point, an annexed letter C is applied to an end of the reference numeral or sign. 
         [0091]    In the residual wound quantity display mechanism  1 C of a movement  3 C of the mechanical timepiece  2 C, the drive lever  40 B has, similarly to the residual wound quantity display mechanism  1 B of the mechanical timepiece  2 B, the short arm part  42 , and the long arm part  43 B forming the angle of about 75 degrees in regard to the arm part  42  concerned. 
         [0092]    A relative position of a display member  50 C in regard to the long arm part  43 B of the drive lever  40 B is the same as a relative position of a display member  50 A in regard to the long arm part  43  of the drive lever  40  of the wound quantity display mechanism  1 A. Accordingly, the display member  50 C differs from the display member  50 A in a point that it exists in an angular position deviated clockwise by 90 degrees in regard to the display member  50 A of  FIG. 10-FIG .  12  and, in other points, it is constituted actually the same as the display member  50 A. Similarly, a relative position of the fixation gearwheel  70 B in regard to the long arm part  43 B of the drive lever  40 B is the same as a relative position of the fixation gearwheel  70  in regard to the long arm part  43  of the drive lever  40 . Accordingly, the fixation gear wheel  70 B differs from the fixation gearwheel  70  in the point that it exists in the angular position deviated clockwise by 90 degrees in regard to the fixation gearwheel  70  of  FIG. 10-FIG .  12  and, in other points, it is constituted actually the same as the fixation gearwheel  70 . 
         [0093]    Further, in comparison with the display arbor  55 A or the slit  56 A or the residual quantity display plate  61 A of  FIG. 10-FIG .  12 , also a display arbor  55 C or a slit  56 C or a residual quantity display plate  61 C differs in the point that it exists in the angular position deviated clockwise by 90 degrees and, in other points, it is constituted actually the same. Incidentally, a point that also a residual wound quantity display graduation  62 C exists in an angular position deviated clockwise by 90 degrees in regard to the residual quantity display graduation  62 A is the same as other elements. However, in the residual quantity display graduation  62 C, numerical values of the graduation are applied in such a direction that it is easy to confirm visually the ordinary timepiece display in which the 6 o&#39;clock position becomes below and the 12 o&#39;clock position becomes above. 
         [0094]    In this mechanical ‘timepiece’  2 C, the residual wound quantity is displayed by the fact that the residual quantity display plate  61 C displaces in GC 1 - and GC 2 -directions along the straight-line-like slit  56 C extending along a locus GC in the 9 o&#39;clock position. 
         [0095]    Although a kind of the locus of the display arbor becomes limitative, if desired, the fixation gearwheel may be an externally-toothed gearwheel (external gearwheel) instead of the internally-toothed gearwheel (internal gearwheel). 
         [0096]    In  FIG. 17-FIG .  20 , there is shown a mechanical timepiece  2 D having a residual wound quantity display mechanism  1 D possessing a fixation gearwheel  70 D in the form of an arc-like externally-toothed gearwheel, which forms one part of a spur gearwheel. 
         [0097]    In the mechanical timepiece  2 D having the residual wound quantity display mechanism  1 D, which is shown in  FIG. 17  to  FIG. 20 , the same reference numeral or sign is applied to a member or element which is the same as the member or element shown in  FIG. 1-FIG .  9  and, as to a member or element which corresponds although having a different point, an annexed letter D is applied to the end of the reference numeral or sign. 
         [0098]    As understood from  FIG. 19 , in the residual wound quantity display mechanism  1 D of a movement  3 D of the mechanical timepiece  2 D, the fixation gearwheel  70 D in the form of the arc-like external gearwheel  71 D is fixed to the 2nd main plate  23 , and a long arm part  43 D of a drive lever  40 D extends beyond the fixation gearwheel  70 D. A display member  50 D mounted to a tip part of the arm part  43 D so as to be rotatable in ED 1 - and ED 2 -directions about a center-axis ED meshes with the arc-like external gearwheel part  71 D of the fixation gearwheel  70 D by a drive gearwheel part  52 D. 
         [0099]    As shown in  FIG. 17 , in a display member  50 D, from the fact that its drive gearwheel part  52 D meshes with the arc-like external gearwheel part  71 D of the fixation gearwheel  70 D, a display arbor  55 D of the display member  50  is placed in an outer periphery side of the timepiece  2 D than the center axis ED, and it is constituted substantially similar to the display member  50  of the residual wound quantity display mechanism  1  of the mechanical timepiece  2  except a point rotating in the ED 1 - and ED 2 -directions. 
         [0100]    As understood from  FIG. 18 , in the residual wound quantity display mechanism  1 D of this mechanical timepiece  2 D, in compliance with the D 1 -direction rotation of the drive lever  40 D, which follows-upon the unwinding of the mainspring  11 , the drive gearwheel  52 D of the display member- 50 D rolls along the fixation gearwheel  70  in the form of the externally-toothed gearwheel  71 D while rotating in the ED 1 -direction. Accordingly, a display arbor  55 D which existed in an initial position U 1 D displaces in a GD 1  direction along an outwardly convex arc-like locus GD, and arrives at a final position U 5 D while passing an intermediate position U 3 D. Incidentally, when winding the mainspring  11 , in compliance with a D 2 -direction rotation of the drive lever  40 D, the display arbor  55 D returns to the initial position U 1 D from the position U 5 D along the locus GD while passing the intermediate position U 3 D. 
         [0101]    Accordingly, as shown in  FIG. 20 , in the mechanical timepiece  2 D, a residual quantity display plate  61 D displaces in the GD 1 - and GD 2 -directions along an outwardly convex arc-like slit  56 D formed so as to coincide with the outwardly convex arc-like locus GD, thereby displaying the residual wound quantity basing on a residual wound quantity display graduation  62 D shown in the dial  7 .