Patent Publication Number: US-9411317-B2

Title: Timepiece

Description:
BACKGROUND 
     1. Technical Field 
     The present invention relates to a timepiece. 
     2. Related Art 
     Wristwatches are so designed that a common movement, which is a basic component, is incorporated in a timepiece case that varies in terms of size and exterior appearance by using a casing ring for both cost reduction and an increase in exterior appearance variation, whereby a plurality of kinds of timepiece having different sizes and exterior appearances are configured (see JP-A-2001-13268, for example). 
     In JP-A-2001-13268, the casing ring (support member) is positioned in the in-plane direction by allowing protrusions formed at a plurality of locations along the outer circumferential surface of the casing ring to come into contact with the inner circumferential surface of an exterior case. 
     On the other hand, the casing ring is positioned in the thickness direction (height direction) of the timepiece by pressing the front surface of the periphery of a dial against the exterior case via a receiving ring (dial receiving member) supported by the casing ring. That is, the dial, the receiving ring, and the casing ring are sequentially disposed between the exterior case and the case back in the direction from the front side to the rear side of the timepiece, and push-up protrusions of the case back press the casing ring toward the front side of the timepiece for the positioning in the height direction. 
     In JP-A-2001-13268 described above, the front surface of the casing ring is not in direct contact with the case, but the lifted casing ring is positioned in the height direction by causing the dial to come into contact with the case via the receiving ring. In this configuration, if the dimensions of the dial, the receiving ring, and the casing ring are not precise enough and have errors, the positions of the casing ring and the receiving ring in the height direction are affected by an accumulated value of the errors. The height position of the movement held by the receiving ring could therefore undesirably vary. 
     SUMMARY 
     An advantage of some aspects of the invention is to provide a timepiece that allows a plurality of kinds of timepiece having different case sizes to be configured at low cost and a movement to be positioned with improved precision. 
     A timepiece according to an aspect of the invention includes a case that accommodates a movement and has a protruding section that protrudes from an inner circumferential surface of the case, a case back attached to the case, a dial receiving ring attached to the movement, a dial disposed on a front surface side of the dial receiving ring, a restriction section that comes into contact with a front surface of the dial to restrict a position of the dial, and a casing ring disposed around an outer circumference of the dial receiving ring. The casing ring includes a casing-ring-side contact section that comes into contact with the inner circumferential surface of the case to position the casing ring in an in-plane direction, a front-surface-side contact section that comes into contact with the protruding section of the case to position the casing ring in a timepiece front surface direction, a casing ring spring section that is formed to be elastically deformable in a thickness direction of the timepiece and comes into contact with the case back, and a support section that protrudes from an inner circumferential surface of the casing ring. The dial receiving ring includes a ring-side contact section that comes into contact with the inner circumferential surface of the casing ring to position the dial receiving ring in the in-plane direction, a ring front-surface-side contact section that comes into contact with a rear surface of the dial, and a ring spring section that is formed to be elastically deformable in the thickness direction of the timepiece and comes into contact with the support section of the casing ring. 
     In the aspect of the invention, the dial, the movement, the dial receiving ring, and the casing ring are accommodated in the case, and the case back is attached to the case. The timepiece is thus assembled. In this process, the casing ring spring section of the casing ring comes into contact with the case back and the casing ring spring section is then elastically deformed, so that the casing ring is pushed up toward the front surface side of the timepiece, and the front-surface-side contact section of the casing ring comes into contact with the protruding section of the case. That is, the casing ring is sandwiched between the case and the case back, and spring force resulting from the elastic deformation of the casing ring spring section presses the casing ring toward the front surface side of the timepiece. As a result, the height position of the casing ring is precisely set in a position where the front-surface-side contact section of the casing ring comes into contact with the protruding section of the case. 
     Further, the ring spring section comes into contact with the casing ring having been in direct contact with the case and hence positioned in the height direction and the ring spring section is then elastically deformed, so that the dial receiving ring is pushed up toward the front surface side of the timepiece, and the ring front-surface-side contact section comes into contact with the rear surface of the dial. That is, the dial receiving ring is sandwiched between the dial and the casing ring, and spring force resulting from the elastic deformation of the ring spring section presses the dial receiving ring toward the front surface side of the timepiece. It is noted that the height-direction position of the dial, the front surface of which comes into contact with the restriction section, for example, a barrel or a bezel of the case or a dial ring, is precisely set with reference to the case. The height position of the dial receiving ring is therefore also precisely set in a position where the ring front-surface-side contact section comes into contact with the dial. As a result, the height position of the movement held by the dial receiving ring can also be precisely set. 
     Further, the in-plane position of the movement can be precisely set because the in-plane position is set when the ring-side contact section of the dial receiving ring comes into contact with the inner circumferential surface of the casing ring and the casing-ring-side contact section of the casing ring comes into contact with the inner circumferential surface of the case. 
     The movement can therefore be positioned with improved precision in the height direction (timepiece thickness direction) and the in-plane direction. Further, when the size of the case is changed, the casing ring only needs to be so changed that the casing-ring-side contact section has a different protruding dimension, whereby the same dial receiving ring and movement can be used as common parts. Therefore, when a plurality of types of timepiece having different case sizes are configured, the common movement and dial receiving ring can be used, whereby the number of types of part can be reduced and cost reduction can therefore be achieved. 
     In the timepiece according to the aspect of the invention, it is preferable that the ring spring section is formed of a plurality of ring spring sections provided along a circumferential direction of the dial receiving ring. 
     The plurality of ring spring sections allow the entire dial receiving ring to be urged toward the dial in a stable manner. 
     In the timepiece according to the aspect of the invention, it is preferable that the ring spring section includes two column sections and a beam section that extends between the column sections, that a hook section that holds the movement is formed on an inner circumferential surface of each of the column sections, and that a push-up protrusion that comes into contact with the support section of the casing ring is formed on a bottom surface of the beam section. 
     When the structure of the ring spring section is primarily formed of two column sections and a beam section that extends between the column sections, the spring force can be increased as compared, for example, with a case where the beam section is supported as a cantilever. Further, when a push-up protrusion is formed on the bottom surface of the beam section, the amount of deflection of the beam section can be increased and the ring spring section can be simply configured with an increase in the magnitude of the spring force. 
     Further, the hook section formed on each of the column sections allows the column sections to deflect when the movement is pressed in, whereby the movement can be readily attached. 
     In the timepiece according to the aspect of the invention, it is preferable that the casing ring spring section is formed of a plurality of casing ring spring sections provided along a circumferential direction of the casing ring. 
     The plurality of casing ring spring sections allow the entire casing ring to be urged toward the protruding section of the case in a stable manner. 
     In the timepiece according to the aspect of the invention, it is preferable that the casing ring spring section has two column sections and a beam section that extends between the column sections, and that a push-up protrusion that comes into contact with the case back is formed on a bottom surface of the beam section. 
     When the structure of the casing ring spring section is primarily formed of two column sections and a beam section that extends between the column sections, the spring force can be increased as compared, for example, with a case where the beam section is supported as a cantilever. Further, when a push-up protrusion is formed on the bottom surface of the beam section, the amount of deflection of the beam section can be increased and the casing ring spring section can be simply configured with an increase in the magnitude of the spring force. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements. 
         FIG. 1  is a front view showing a timepiece according to an embodiment of the invention. 
         FIG. 2  is a schematic cross-sectional view taken along the line II-II in  FIG. 1 . 
         FIG. 3  is an exploded perspective view of key portions of the timepiece. 
         FIG. 4  is an exploded perspective view showing a dial receiving ring and a casing ring of the timepiece. 
         FIG. 5  is another exploded perspective view showing the dial receiving ring and the casing ring of the timepiece. 
         FIG. 6  is an enlarged cross-sectional view of key portions of the timepiece. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     A timepiece (wristwatch)  1  according to an embodiment of the invention will be described below with reference to  FIGS. 1 to 5 .  FIG. 2  is a cross-sectional view taken along the line II-II in  FIG. 1 . In  FIG. 2 , the left half shows a cross section of part of the timepiece, the portion from the six-o&#39;clock position to the shaft of indicating hands, and the right half shows a cross section of part of the timepiece, the portion from the shaft of the indicating hands to the three-o&#39;clock position. In the description of each component of the timepiece  1 , the surface of the component on the side facing the front surface of the timepiece  1  (the side facing a cover glass plate  5 ) is called a front surface or an upper surface, and the surface of the component on the side facing a case back  4  is called a rear surface, a bottom surface, or a lower surface in some cases. 
     The timepiece  1  includes an exterior case  2 , which accommodates a movement, which will be described later, and other components. The exterior case  2  has a case body  3  and the case back  4 . The case body  3  has a cylindrical barrel  11  and a bezel  12  provided on the front surface side of the barrel  11 . 
     The barrel  11  is provided with a crown  30 . A roughly annular protruding section  111  is formed along the inner circumferential surface of the barrel  11  and continuously extends along the circumferential direction of the inner circumferential surface, as shown in  FIGS. 2 and 3 . 
     The bezel  12  is formed in a ring shape. The bezel  12  and the barrel  11  are connected to each other by using a fitting structure in which a protrusion formed on one of surfaces of the bezel and barrel that face each other is fit into a recess formed in the other or by using a double-sided adhesive tape, an adhesive, or any other bonding means. The bezel  12  may be attached to the barrel  11  in a rotatable manner. 
     The cover glass plate  5 , which is held by the bezel  12 , is so attached to the bezel  12  that the cover glass plate  5  is located inside the bezel  12 . Further, a roughly annular protruding section  121  is formed along the inner circumferential surface of the bezel  12  and continuously extends along the circumferential direction of the inner circumferential surface. 
     The case back  4 , which has a disk shape and closes the rear-surface-side opening of the case body  3 , is provided on the rear surface side of the case body  3 . The case back  4  is screwed into the barrel  11  of the case body  3 . 
     The barrel  11 , the bezel  12  and the case back  4  are made of BS (brass), SUS (stainless steel), a titanium alloy, or any other metal material. 
     Internal Structure of Timepiece 
     A description will next be made of an internal structure built in the exterior case  2  of the timepiece  1 . 
     In the exterior case  2  are accommodated a movement  6 , a dial  15 , a dial ring  16 , which is disposed along the outer circumferential edge of the dial  15 , a dial receiving ring  70 , and a casing ring  75 , as shown in  FIGS. 2 and 3 . 
     The movement  6  is attached to the inner circumference of the dial receiving ring  70 . The dial  15  is in contact with the front surface of the dial receiving ring  70  and so attached that the dial  15  is located on the timepiece front surface side of the movement  6  (the side facing the cover glass plate  5 ). 
     Movement 
     The movement  6  can be a movement having been used in a timepiece of related art. In the present embodiment, the movement  6  includes a power generator that generates electric power by rotation of a rotating weight  68 , a secondary battery charged by the electric power generated by the power generator, and a motor driven by the electric power from the secondary battery. 
     The movement  6  may instead be a movement for a typical quartz timepiece in which a button-shaped primary battery drives a stepper motor or a movement including a power generator that generates electric power by use of a mainspring as a drive source, a secondary battery charged by the electric power generated by the power generator, and a motor driven by the electric power from the secondary battery. The movement  6  may still instead be a movement for a mechanical timepiece in which drive force produced by a mainspring rotates train wheels and a speed controller performs speed control. 
     The movement  6  in the present embodiment drives an hour hand  61 , a minute hand  62 , and a second hand  63  shown in  FIG. 1  via a stepper motor and train wheels. The movement  6  further drives a date indicator  65  via the stepper motor and the train wheels. A date indicator maintaining plate  66  is disposed on the front surface side of the date indicator  65 . The layout, the number, the type, and other attributes of the indicating hands and the date indicator are not limited to those shown in  FIG. 1 . 
     Further, a winding stem  31  is disposed in the movement  6 , and the crown  30  is attached to an end portion of the winding stem  31 . 
     Dial Receiving Ring 
     The dial receiving ring  70  is made of a polyacetal resin or any other synthetic resin and includes an upper surface section  71 , which is formed in an annular shape, ring spring sections  72 , which extend from the upper surface section  71  toward the casing ring  75 , and sidewall sections  73 , which extend from the upper surface section  71  toward the casing ring  75  and are disposed between the ring spring sections  72 , as shown in  FIGS. 4 and 5 . 
     The upper surface section  71  has three recesses  711  formed therein, and the portions between the recesses  711  form ring front-surface-side contact sections  712 , which protrude toward the front surface side, that is, the dial  15 . 
     The recesses  711  are dial removal grooves used when the dial  15  is removed from a main plate of the movement  6 . The ring front-surface-side contact sections  712  are sections that are in contact with the rear surface of the dial  15  and receive the dial  15 . 
     The ring spring sections  72 , the number of which is four, are formed in the circumferential direction of the upper surface section  71 . Among them, two ring spring sections  72 A and  72 B are formed in the same position as those of two of the recesses  711 . The ring spring section  72 A is formed roughly in the two-o&#39;clock in-plane position of the dial  15 , and the ring spring section  72 B is formed roughly in the seven-o&#39;clock in-plane position of the dial  15 . 
     The other two ring spring sections  72 C and  72 D are formed as follows: the ring spring section  72 D is formed in the twelve-o&#39;clock in-plane position of the dial  15 ; and the ring spring section  72 C is so formed that the position thereof in the circumferential direction of the upper surface section  71  is the middle position between the ring spring section  72 B and the ring spring section  72 D (roughly nine-o&#39;clock position of the dial  15 ). 
     Each of the ring spring sections  72  ( 72 A to  72 D) includes two column sections  721 , which continuously extend from the upper surface section  71 , and a beam section  722 , which extends between the column sections  721 . A push-up protrusion  723  is formed on the bottom surface of the beam section  722  in the middle position thereof. A space present above the front surface of each of the beam sections  722  allows, when force toward the upper surface section  71  acts on the push-up protrusions  723 , the beam sections  722  to deflect toward the upper surface section  71 , and the spring resultant force urges the dial receiving ring  70  toward the dial  15 . 
     Hook sections  724  for holding the movement  6  are formed on the inner circumferential surfaces of the column sections  721 . 
     Play prevention protrusions  725  and  735 , which come into contact with a support section  79  of the casing ring  75 , which will be described later, to prevent “play” of the dial receiving ring  70  in the height direction, are formed on the bottom surfaces (lower surfaces) of the ring spring sections  72  and the sidewall sections  73 . 
     The play prevention protrusions  725  provided on each of the ring spring sections  72  are formed on the lower surface of the beam section  722  at two locations, and the push-up protrusion  723  is formed therebetween. 
     The play prevention protrusion  735  provided on each of the sidewall sections  73  is formed on the lower surface thereof roughly at the middle position in the circumferential direction. 
     Ring-side contact sections  74 , which come into contact with the inner circumferential surface of the casing ring  75  to position the dial receiving ring  70  in the in-plane direction, are formed along the outer circumferential surface of the dial receiving ring  70 . The ring-side contact sections  74  are so formed that they protrude from lower end portions of the outer circumferential surfaces of the ring spring sections  72  and the sidewall sections  73 . 
     In the present embodiment, play prevention protrusions  741 , which prevent play of the dial receiving ring  70  relative to the casing ring  75  in the in-plane direction, are formed on the outer circumferential surfaces of the ring-side contact sections  74  and in the positions corresponding to the play prevention protrusions  725  and  735 . 
     Casing Ring 
     The casing ring  75  is made of a polyacetal resin or any other synthetic resin as the dial receiving ring  70  and includes a body section  76 , which is formed in an annular shape, casing ring spring sections  77 , which extend from the inner circumferential edge of the body section  76  toward the case back  4 , and sidewall sections  78 , which extend from the body section  76  toward the case back  4  and are disposed between the casing ring spring sections  77 , as shown in  FIGS. 4 and 5 . 
     The upper surface of the body section  76  functions as a front-surface-side contact section  761 , which comes into contact with the protruding section  111  of the barrel  11  described above. The outer circumferential surface of the body section  76  functions as a casing-ring-side contact section  762 , which comes into contact with the inner circumferential surface of the barrel  11  to position the casing ring  75  in the in-plane direction. 
     The casing ring spring sections  77 , the number of which is four, are formed in the circumferential direction of the body section  76 . The positions of the four casing ring spring sections  77  formed in the circumferential direction of the body section  76  are the middle position between the twelve-o&#39;clock and three-o&#39;clock positions, the middle position between the three-o&#39;clock and six-o&#39;clock positions, the middle position between the six-o&#39;clock and nine-o&#39;clock positions, and the middle position between the nine-o&#39;clock and twelve-o&#39;clock positions of the dial  15 . 
     Each of the casing ring spring sections  77  includes two column sections  771 , which continuously extend from the body section  76 , and a beam section  772 , which extends between the column sections  771 . 
     A push-up protrusion  773  is formed on the bottom surface of each of the beam sections  772 . The push-up protrusion  773  is formed at the middle position of the beam section  772 . A space present above the front surface of each of the beam sections  772  allows, when the push-up protrusions  773  come into contact with the case back  4  so that force toward the body section  76  acts on the beam sections  772 , the beam sections  772  to deflect toward the body section  76 , and the resultant spring force urges the casing ring  75  toward the dial receiving ring  70 . 
     Play prevention protrusions  785 , which come into contact with the case back  4  to prevent “play” of the casing ring  75  in the thickness direction of the timepiece, are formed on the bottom surfaces of the sidewall sections  78 . 
     The support section  79  protrudes from the inner circumferential surface of the casing ring  75 . The support section  79  is a ring-shaped protruding section continuously formed along the inner circumferential surfaces of the casing ring spring sections  77  and the sidewall sections  78 . The dial receiving ring  70  described above is placed on the upper surface of the support section  79 . 
     Dial 
     The dial  15  is formed of a plate made, for example, of stainless steel or any other metal material or a plastic material, and legs protruding from the bottom surface of the dial  15  are press-fit into the main plate of the movement  6 , whereby the dial  15  is so attached that it is located on the front surface side of the movement  6 . In this process, the rear surface of the dial  15  comes into contact with the dial receiving ring  70 , whereby the height position of the dial  15  relative to the movement  6  is defined. As a result, a predetermined space is formed between the dial  15  and the main plate of the movement  6 , and the date indicator  65  and the date indicator maintaining plate  66  are disposed in the space. 
     The dial ring  16  is disposed at the outer circumferential edge of the dial  15 . The upper surface of the dial ring  16  is in contact with the lower surface of the protruding section  121  of the bezel  12 . Therefore, in the present embodiment, the dial ring  16  forms a restriction section that comes into contact with the front surface of the dial  15  to restrict the position of the dial  15  in the height direction. 
     Structure for Positioning Casing Ring in in-Plane-Direction 
     In the thus configured timepiece  1 , the dial ring  16 , the dial  15 , the dial receiving ring  70 , the casing ring  75 , and the movement  6  are disposed in the case body  3 . In this process, the casing-ring-side contact section  762  of the casing ring  75  comes into contact with the inner circumferential surface of the barrel  11 , as shown in  FIG. 6 . The casing ring  75  is thus positioned in the in-plane direction. 
     Structure for Positioning Casing Ring in Height-Direction 
     When the case back  4  is screwed into the barrel  11 , the casing ring  75 , specifically, the front-surface-side contact section  761  of the body section  76  comes into contact with the lower surface of the protruding section  111  of the barrel  11 , and the case back  4  presses the push-up protrusions  773  on the beam sections  772  of the casing ring spring sections  77  to deflect the beam sections  772 . The amount of deflection of the beam sections  772  is the dimension H 1  shown in  FIG. 6 . 
     The deflection of the beam sections  772  produces spring force, and reaction of the spring force urges the casing ring  75  toward the front surface side of the timepiece  1 , whereby the casing ring  75  is positioned in a position where the front-surface-side contact section  761  comes into contact with the protruding section  111 . That is, the casing ring  75  is sandwiched between the protruding section  111  of the barrel  11  and the case back  4 . 
     As a result, the casing ring  75  is positioned in the height direction (timepiece thickness direction) relative to the case body  3 , and the support section  79  of the casing ring  75  is also positioned in the height direction (timepiece thickness direction) relative to the case body  3 . 
     Structure for Positioning Dial Receiving Ring and Movement in in-Plane Direction 
     The ring-side contact sections  74  of the dial receiving ring  70  come into contact with the inner circumferential surface of the casing ring  75 . The dial receiving ring  70  is thus positioned in the in-plane direction. Therefore, with reference to the inner circumferential surface of the barrel  11  of the exterior case  2 , the casing ring  75  and the dial receiving ring  70  are positioned, and the movement  6 , which is supported by the dial receiving ring  70 , is also positioned in the in-plane direction. 
     Structure for Positioning Dial Receiving Ring and Movement in Height-Direction 
     The ring front-surface-side contact sections  712  of the dial receiving ring  70  come into contact with the dial  15 . Since the dial ring  16  comes into contact with the protruding section  121  of the bezel  12 , the dial  15  is positioned in the height direction relative to the case body  3 . 
     Further, the support section  79  of the casing ring  75  presses the push-up protrusion  723  on the beam sections  722  of the dial receiving ring  70  to deflect the beam sections  772 . The deflection of the beam sections  722  produces spring force, and reaction of the spring force urges the dial receiving ring  70  toward the front surface side of the timepiece  1 , whereby the dial receiving ring  70  is positioned in a position where the ring front-surface-side contact section  712  comes into contact with the dial  15 . That is, the dial receiving ring  70  is sandwiched between the dial  15  and the support section  79  of the casing ring  75 . 
     As a result, the dial receiving ring  70  is positioned in the height direction (timepiece thickness direction) relative to the case body  3 , and the movement  6 , which is supported by the dial receiving ring  70 , is also positioned in the height direction (timepiece thickness direction) relative to the case body  3 . 
     Advantageous Effects of Present Embodiment 
     Since the casing ring  75  can be positioned relative to the case body  3  in the height direction and the in-plane direction, and the dial receiving ring  70  can be positioned with reference to the thus positioned casing ring  75  in the height direction and the in-plane direction, the movement  6  supported by the dial receiving ring  70  can be precisely positioned relative to the case body  3  in the height direction and the in-plane direction. 
     Further, when the size of the exterior case  2  of the timepiece  1  is changed, the casing ring  75  only needs to be so changed that the casing-ring-side contact section  762  has a different protruding dimension, whereby the same dial receiving ring  70  and movement  6  can be used as common parts. Therefore, when a plurality of types of timepiece  1  having different case sizes are configured, the common movement  6  and dial receiving ring  70  can be used, whereby the number of types of part can be reduced and cost reduction can therefore be achieved. 
     Comparison between the dial receiving ring  70  and the casing ring  75  shows that the dial receiving ring  70  is more complicated in terms of shape than the casing ring  75  because the dial receiving ring  70  has the hook sections  724  for engagement with the movement  6 , the ring spring sections  72 , the recesses  711  for removal of the dial  15 , and other components. Since the dial receiving ring  70  having the complicated shape is configured as a common part, and the casing ring  75 , which has a simpler shape than the dial receiving ring  70  and can thus be manufactured at lower cost, is prepared for each case size, the manufacturing cost can be lowered as compared with a case where the dial receiving ring  70  is manufactured for each case size. 
     Since the dial receiving ring  70  has a plurality of ring spring sections  72 , specifically, four ring spring sections  72 , the dial receiving ring  70  can be urged toward the dial  15  without inclination but in a stable manner. 
     Similarly, the casing ring  75  has a plurality of casing ring spring sections  77 , specifically, four casing ring spring sections  77 , the casing ring  75  can also be urged toward the protruding section  111  without inclination but in a stable manner. 
     The ring spring sections  72 , each of which includes the column section  721  and the beam section  722 , and the casing ring spring sections  77 , each of which includes the column section  771  and the beam section  772 , can be simply shaped and provide large spring force. 
     Further, since the push-up protrusions  723  and  773  are formed on the bottom surfaces of the beam sections  722  and  772 , each of the beam sections  722  and  772  can be deflected by a large amount. 
     Moreover, since the hook sections  724  are formed on the column sections  721  of the ring spring sections  72 , and the hook sections  724  hold the movement  6 , the movement  6  can be readily attached. 
     The invention is not limited to the embodiment described above and can be implemented in a variety of variations within the scope of the substance of the invention. 
     For example, the number of ring spring sections  72  and casing ring spring sections  77  is not limited to those in the embodiment described above. In particular, three or more spring sections are preferable because the ring spring sections  72  and the casing ring spring sections  77  can be stably urged. 
     Further, the ring spring sections  72  and the casing ring spring sections  77  are not necessarily configured as in the embodiment described above and only need to deflect to produce spring force when they come into contact with the case back  4  and the support section  79 . 
     The restriction section that restricts the position of the dial  15  in the height direction is not limited to the dial ring  16 . For example, when the dial  15  is directly allowed to come into contact with the bezel  12  or the barrel  11 , a section with which the dial  15  comes into contact is the restriction section. 
     The entire disclosure of Japanese Patent Application No. 2014-255170, filed Dec. 17, 2014 is expressly incorporated by reference herein.