Barrel wheel, movement and timepiece

Abstract

The present application provides a barrel wheel, a movement, and a timepiece, capable of suppressing the increase in size. A barrel wheel (1000) rotates with a mainspring (30) as a power source, and includes a barrel shaft having a rotation axis (J), a barrel (100) that houses the mainspring (30), and a barrel cover (200) that is attached to the barrel (100) to form a housing space (200A) that houses the mainspring (30). The barrel cover (200) has a flat portion (210) that extends along a first direction intersecting an axial direction along the rotation axis (J), and a side portion (220) that extends from an end portion of the flat portion (210) along a second direction intersecting the first direction. The side portion (220) has a second engaging portion (230) that fixes the barrel cover (200) to the barrel (100) by engaging with a first engaging portion (110) formed in the barrel (100). A first groove (240) that absorbs stress is formed in the side portion (220).

Description

Technical Field

[0001] This invention relates to barrel wheels, movements, and watches. Background Technology

[0002] Patent Document 1 discloses a canister wheel structure in which a mainspring is housed in a space formed by fitting the outer peripheral wall of a canister cover with claws into the outer peripheral wall of a canister gear. When the canister cover is fitted into the outer peripheral wall of the canister gear, it expands to avoid the claws, and therefore sometimes deforms. If the canister cover deforms, it comes into contact with components near the canister wheel; therefore, to suppress deformation of the canister cover, its thickness is sometimes increased.

[0003] Patent Document 1: Japanese Patent Application Publication No. 11-174162

[0004] However, in the previous structure, when the thickness of the barrel cover was increased, the barrel wheel became thicker, which raised the issue of increasing the size of the movement and thus the watch. Summary of the Invention

[0005] A barrel wheel is a barrel wheel that rotates using a mainspring as a power source. It has: a barrel shaft having a rotation axis; a barrel for storing the mainspring; and a barrel cover mounted on the barrel to form a storage space for storing the mainspring. The barrel cover has: a flat portion extending along a first direction that intersects an axial direction along the rotation axis; and a side portion extending from the end of the flat portion along a second direction intersecting the first direction. The side portion has a second engaging portion that secures the barrel cover to the barrel by engaging with a first engaging portion formed on the barrel. A first groove for cushioning stress is formed on the side portion.

[0006] The movement includes: the barrel wheel described above; a wheel train driven by the barrel wheel; a base plate on which the barrel wheel is disposed; and a wheel train clamp plate that, together with the base plate, supports the barrel wheel and the wheel train.

[0007] The watch has the movement described above and a case housing the movement. Attached Figure Description

[0008] Figure 1 This is a top view showing the structure of the dial side of a clock.

[0009] Figure 2 This is a top view showing the structure of the back cover of the clock.

[0010] Figure 3 This is a top view showing the structure of the dial side of the movement.

[0011] Figure 4 This is a top view showing the structure of the back cover side of the movement.

[0012] Figure 5 It is a cross-sectional view showing the structure of the main parts of the movement.

[0013] Figure 6 It is a cross-sectional view showing the structure of the main parts of the movement.

[0014] Figure 7 It is a cross-sectional view showing the structure of the main parts of the movement.

[0015] Figure 8 It is a three-dimensional diagram showing the structure of the main parts of the movement.

[0016] Figure 9 It is a three-dimensional diagram showing the structure of the main parts of the movement.

[0017] Figure 10 This is a cross-sectional view showing the structure of the carton wheel in this embodiment.

[0018] Figure 11 This is a cross-sectional view showing the structure of the carton wheel in modified example 1.

[0019] Figure 12 This is a cross-sectional view showing the structure of the carton wheel in variation example 2.

[0020] Figure 13 This is a cross-sectional view showing the structure of the carton wheel in variation example 3.

[0021] Figure 14 This is a cross-sectional view showing the structure of the carton wheel in variation example 4.

[0022] Figure 15 This is a cross-sectional view showing the structure of the carton wheel in variation 5.

[0023] Figure 16 This is a cross-sectional view showing the structure of the carton wheel in variation 6.

[0024] Figure 17 This is a cross-sectional view showing the structure of the carton wheel in variation 7.

[0025] Figure 18 This is a cross-sectional view showing the structure of the carton wheel in variation 8.

[0026] Figure 19A This is a cross-sectional view showing the structure of a conventional carton wheel.

[0027] Figure 19B This is a cross-sectional view showing the structure of a conventional carton lid.

[0028] Label Explanation

[0029] 1… Clock; 2… Outer case; 3… Dial; 3A… Date window; 3B… Hour marker; 4A… Hour hand; 4B… Minute hand; 4C… Second hand; 5… Power reserve hand; 6… Date wheel; 8… Case back; 8A… Bezel; 8B… Case back glass; 10…Movement; 11…Baseplate; 13…Second bridge plate; 14…Gear train bridge plate; 14A…Graduation section; 20…First mainspring; 21…First barrel wheel; 22…First barrel; 23…First barrel axle; 24…First mainspring wheel; 27…Barrel intermediate wheel; 30…Second mainspring (as mainspring); 31…Second barrel wheel (as barrel wheel); 32…Second barrel; 33…Second barrel axle (as barrel axle); 34…Second mainspring wheel; 40…Manual winding mechanism; 41…Handle pinion; 42…Clutch wheel; 43…Standing wheel; 44…Small steel wheel; 45…First drive wheel of the large steel wheel; 46…Second drive wheel of the large steel wheel; 47…Third drive wheel of the large steel wheel; 50…Automatic winding mechanism; 51…Pendant; 52…Bearing; 53…Eccentric wheel; 54…Pawl lever; 55…Drive wheel; 80…Generator; 81…Rotor; 81A…Rotor magnet; 81C…Rotor inertia plate; 82; 83…Coil block; 90…Display gear train as a gear train; 92…Gear No. 2; 93…Gear No. 3; 94…Gear No. 4; 95…Gear No. 5; 96…Gear No. 6; 97…Hour wheel; 100…Bar box; 110…First engaging part; 200…Bar box cover; 200A…Storage space; 210…Flat part; 220…Side part; 221…Outer side; 222…Inner side; 223…End face; 230…Second engaging part; 240, 240A, 240B, 240C, 240D, 240E, 240F, 240G, 240H…First groove; 240D1…First inclined part; 240D2…Second inclined part; 240E2…Second extension; 240E3…Arc portion; 240E1…First extension portion; 240G2…Second groove; 240G1…First groove; 241…First inclined portion; 242…Second inclined portion; 243…Bottom; 511…Flag; 512…Hammer body; 512A…Opening; 521…Pendulum gear; 531…Eccentric gear; 532…Eccentric shaft component; 551…Transmission wheel shaft; 552…First transmission gear; 553…Second transmission gear; 941…Second hand shaft; 942…Fourth gear; 943…Fourth pinion; 1000, 1000A, 1000B, 1000C, 1000D, 1000E, 1000F, 1000G, 1000H…Carton wheel. Detailed Implementation

[0030] The structure of the barrel wheel 1000, movement 10, and watch 1 will be described below with reference to the accompanying drawings. In the following figures, top view refers to the view taken along the direction of the first axis 23 and the second axis 33, which will be described later, that is, the direction orthogonal to the dial 3, while sectional view refers to the view taken from the direction perpendicular to the first axis 23 and the second axis 33.

[0031] First, refer to Figure 1 and Figure 2 The structure of clock 1 will be explained.

[0032] like Figure 1 and Figure 2 As shown, clock 1 is a wristwatch worn on a user's wrist, having a cylindrical outer casing 2 as its housing, and a dial 3 disposed on the inner circumference of the outer casing 2. In this embodiment, clock 1 is a skeletonized clock with the energy storage hand 5 visible from the back side of clock 1.

[0033] Watch 1 is a wristwatch worn on a user's wrist, having a cylindrical outer case 2, with a dial 3 arranged on the inner circumference of the outer case 2. The front opening of the outer case 2 is closed by a glass cover, and the back opening is closed by a back cover 8. The back cover 8 consists of an annular frame 8A and a back cover glass 8B mounted on the frame 8A.

[0034] Clock 1 has: a movement 10 housed within an outer casing 2 (see reference) Figure 3 and Figure 4 ); hour hand 4A, minute hand 4B, second hand 4C indicating time information; and mainsprings 20 and 30 (see reference). Figure 5 and Figure 6 The remaining energy storage needle 5 of the upper bar.

[0035] A calendar window 3A is provided on dial 3, through which the date wheel 6 can be viewed. In addition, hour markers 3B are provided on dial 3 to indicate the time.

[0036] like Figure 2 As shown, an opening 512A is formed in the hammer body 512 of the pendulum 51, which reduces the likelihood that the energy storage needle 5 cannot be visually seen depending on the position of the pendulum 51. A fan-shaped scale portion 14A is provided on the back of the gear train clamp plate 14. By indicating this scale portion 14A with the energy storage needle 5, the remaining winding amount of the mainspring 20 and 30 can be displayed.

[0037] A crown 7 is provided on the side of the outer casing 2. The crown 7 can be moved from the 0th position, which is pressed in toward the center of the clock 1, to the 1st and 2nd positions.

[0038] When the crown 7 is rotated at position 0, the mainsprings 20 and 30 installed in the movement 10 can be wound. The energy storage needle 5 moves in conjunction with the winding of the mainsprings 20 and 30.

[0039] When the crown 7 is pulled to position 1 and rotated, the date wheel 6 moves to calibrate the date. When the crown 7 is pulled to position 2, the second hand 4C stops. When the crown 7 is rotated at position 2, the hour hand 4A and minute hand 4B move to calibrate the time.

[0040] Next, refer to Figures 3-9 The structure of movement 10 will be explained.

[0041] like Figures 3-9 As shown, the movement 10 has a first barrel wheel 21 for housing the first mainspring 20 and a second barrel wheel 31 for housing the second mainspring 30. Hour hand 4A, minute hand 4B, second hand 4C (see reference). Figure 1 They are respectively installed on the hour wheel 97 of the movement 10 (refer to) Figure 3 ), 921 (refer to) Figure 7 ), Second hand axis 941 (reference) Figure 4 , Figure 7 It is driven by the first mainspring 20 and the second mainspring 30 of the movement 10.

[0042] Movement 10 has a base plate 11 (see reference) Figure 6 , Figure 7 ), No. 2 plywood 13 (refer to) Figure 7 ) and wheel train clamp 14 (refer to Figures 5-7 ).

[0043] like Figure 5 and Figure 6 As shown, between the base plate 11 and the wheel train clamp plate 14 are arranged: a first barrel wheel 21 that houses the first mainspring 20; a second barrel wheel 31 that houses the second mainspring 30; and a manual winding mechanism 40 and an automatic winding mechanism 50 for winding the first mainspring 20 and the second mainspring 30 (see reference). Figure 4 ).

[0044] Between the base plate 11, the second clamping plate 13, and the wheel system clamping plate 14, there is an energy storage and display mechanism that displays the remaining winding amount of the mainsprings 20 and 30; and a wheel system 90 (see reference) that serves as a display for the wheel system. Figure 7 ), which transmits the torque of the springs 20 and 30; and the generator 80 (refer to Figure 4 It is driven by torque transmitted via the display gear train 90.

[0045] Next, refer to Figure 8 and Figure 9 The structure of the first mainspring 20 and the first barrel wheel 21 will be described.

[0046] The first barrel wheel 21 has a first mainspring 20, a first barrel 22, and a first barrel shaft 23. For example... Figure 8 As shown, a first large steel wheel 24 is mounted on the first shaft 23 and rotates integrally with the first shaft 23.

[0047] Next, refer to Figure 4 and Figure 8 Explain the structure of the manual winding mechanism 40.

[0048] like Figure 4 and Figure 8 As shown, the manual winding mechanism 40 has a handle shaft 41 with a handle head 7 mounted on it, a clutch wheel 42, a vertical wheel 43, a small steel wheel 44, a first transmission wheel 45 of a large steel wheel, a second transmission wheel 46 of a large steel wheel, and a third transmission wheel 47 of a large steel wheel. The third transmission wheel 47 of the large steel wheel meshes with the first large steel wheel 24.

[0049] When the user rotates the operating handle 7 in the 0 position, the handle shaft 41 and clutch wheel 42 rotate. With the handle 7 in the 0 position, clutch wheel 42 engages with the vertical wheel 43, and the rotation of clutch wheel 42 is transmitted sequentially from the vertical wheel 43 to the small steel wheel 44, the first transmission wheel 45 of the large steel wheel, the second transmission wheel 46 of the large steel wheel, and the third transmission wheel 47 of the large steel wheel. Therefore, the first large steel wheel 24 and the first shaft 23 rotate, and the first mainspring 20 is wound.

[0050] Furthermore, the second drive wheel 46 of the mainspring is a wheel with a flathead screw. By inserting a flathead screwdriver or the like into the flathead screw and rotating it, the first mainspring 20 can be wound. Therefore, the first mainspring 20 can be wound when assembling the movement 10, resulting in a structure that does not compromise convenience even without the mainspring screw.

[0051] Next, refer to Figure 2 , Figures 4-6 The structure of the automatic winding mechanism 50 is described.

[0052] like Figure 2 , Figures 4-6 As shown, the automatic winding mechanism 50 has a pendulum 51, a bearing 52, an eccentric wheel 53 that meshes with the pendulum gear 521 on the outer ring of the bearing 52, a ratchet bar 54, and a drive wheel 55.

[0053] The pendulum 51 has a weight 511 and a hammer body 512. The bearing 52 rotatably supports the pendulum 51, and the outer ring has a pendulum gear 521 that rotates integrally with the pendulum 51.

[0054] like Figure 6As shown, the eccentric wheel 53 includes an eccentric shaft component 532 and an eccentric gear 531. The eccentric shaft component 532 is supported on the base plate 11 and the gear train clamping plate 14. Furthermore, the eccentric shaft component 532 has an eccentric shaft portion that is eccentrically positioned from the axis of rotation. The eccentric gear 531 meshes with the pendulum gear 521 of the bearing 52. Thus, the eccentric wheel 53 and the pendulum 51 rotate in conjunction in both forward and reverse directions.

[0055] like Figure 4 and Figure 6 As shown, the pawl 54 is rotatably mounted on the eccentric shaft portion of the eccentric shaft component 532 of the eccentric wheel 53. When the eccentric wheel 53 rotates in conjunction with the pendulum 51, the pawl 54 mounted on the eccentric wheel 53 moves back and forth in the direction of approaching and moving away from the transmission wheel 55, causing the transmission wheel 55 to rotate in one direction.

[0056] like Figure 6 As shown, the transmission wheel 55 includes a transmission wheel shaft 551, a first transmission gear 552, and a second transmission gear 553. The transmission wheel shaft 551 is supported on the base plate 11 and the gear train clamping plate 14. The pawl lever 54 engages with the first transmission gear 552, and the forward and backward movements of the transmission wheel 55 and the pawl lever 54 are linked to rotate in one direction. Furthermore, the second transmission gear 553 meshes with the first large steel wheel 24.

[0057] Thus, the first large steel wheel 24 rotates in conjunction with the rotation of the transmission wheel 55. When the first large steel wheel 24 rotates, the first shaft 23 rotates integrally with the first large steel wheel 24, and the first mainspring 20 is wound. Therefore, the clock 1 of this embodiment can wind the first mainspring 20 by both manual winding based on the operating crown 7 and automatic winding based on rotating the pendulum 51. The transmission wheel 55 is the winding wheel that meshes with the first large steel wheel 24 in the automatic winding mechanism 50.

[0058] Next, refer to Figure 4 and Figure 5 The structure of the second mainspring 30 and the second barrel wheel 31 will be described.

[0059] like Figure 4 and Figure 5 As shown, the second mainspring 30 is housed in the second barrel wheel 31. The second barrel wheel 31 has a second barrel 32 and a second shaft 33. The second shaft 33 is capable of rotating integrally with the second large steel wheel 34.

[0060] The second mainspring 30 is wound by the first mainspring 20. That is, when the first mainspring 20 is wound and accumulates torque sufficient to wind the second mainspring 30, the first barrel 22 of the first barrel wheel 21 rotates. The first barrel 22 engages with the second large steel wheel 34 of the second barrel wheel 31 via the barrel intermediate wheel 27. When the first barrel 22 rotates, the second large steel wheel 34 and the second shaft 33 rotate, and the second mainspring 30 is wound.

[0061] Therefore, in the clock 1 of this embodiment, the first mainspring 20 and the second mainspring 30 can be wound by either the manual winding mechanism 40 or the automatic winding mechanism 50. Alternatively, the clock 1 may also be provided with only one of the manual winding mechanism 40 and the automatic winding mechanism 50.

[0062] Next, refer to Figure 4 Explain the structure of generator 80.

[0063] like Figure 4 As shown, the generator 80 is configured to include a rotor 81 and coil blocks 82 and 83. The rotor 81 includes a rotor magnet 81A, a rotor pinion 81B, and a rotor inertia plate 81C. The rotor inertia plate 81C reduces the rotational speed variation of the rotor 81 relative to the driving torque variation from the second housing 32. The coil blocks 82 and 83 are configured by winding coils on each iron core.

[0064] Therefore, when the rotor 81 rotates due to external torque, the generator 80 can generate induced power through coil blocks 82 and 83, output electrical energy and supply it to ICs, etc. In addition, by short-circuiting the coils, braking can be applied to the rotor 81, and by controlling the braking force, the rotational cycle of the rotor 81 can be adjusted to a constant speed.

[0065] Next, refer to Figure 4 , Figure 7 , Figure 8 as well as Figure 9 The gear train 90 is described below.

[0066] like Figure 4 , Figure 7 , Figure 8 as well as Figure 9 As shown, the display gear train 90 drives the hour hand 4A, minute hand 4B, and second hand 4C via mechanical energy from the first mainspring 20 and the second mainspring 30. The display gear train 90 has a second wheel 92, a third wheel 93, a fourth wheel 94, a fifth wheel 95, and a sixth wheel 96. The rotation of the second barrel 32, after being transmitted to the second wheel 92, is sequentially accelerated to the third wheel 93, the fourth wheel 94, the fifth wheel 95, and the sixth wheel 96, and is then transmitted to the rotor 81.

[0067] The minute hand 4B is fixed to the second wheel 92 via the minute wheel 921. The fourth wheel 94 includes a second hand shaft 941 on which the second hand 4C is fixed, a fourth gear 942 that meshes with the fifth wheel 95, and a fourth pinion 943 that meshes with the third wheel 93. In this embodiment, the second hand shaft 941 of the fourth wheel 94 is supported by the gear train clamp 14 and by the base plate 11 via the minute wheel 921. An hour wheel 97 (not shown) is connected to the minute wheel 921 via a cross wheel, and the hour hand 4A is fixed to the hour wheel 97.

[0068] Next, refer to Figure 8 The structure of the second barrel wheel 31, which serves as the barrel wheel, will be described below. Hereinafter, the second barrel wheel 31 will be referred to as the barrel wheel 1000, the second mainspring 30 as the mainspring 30, and the second barrel shaft 33 as the barrel shaft 33.

[0069] The barrel wheel 1000 rotates using the mainspring 30 as a power source. The barrel wheel 1000 has: a barrel shaft 33 having a rotation axis J; a barrel 100 for storing the mainspring 30; and a barrel cover 200 mounted on the barrel 100.

[0070] Specifically, such as Figure 10 As shown, the canister wheel 1000 forms a storage space 200A for storing the spring 30 through the canister 100 and the canister cover 200 installed on the canister 100.

[0071] The carton cover 200 has a flat portion 210 extending along a first direction, which intersects the axial direction along the rotation axis J. Additionally, the carton cover 200 has a side portion 220 extending from the end of the flat portion 210 along a second direction intersecting the first direction. In this embodiment, the first direction is orthogonal to the axial direction along the rotation axis J, and the second direction is orthogonal to the first direction.

[0072] A concave first engaging portion 110 is formed at the end of the carton 100. A convex second engaging portion 230 is formed at the end of the side portion 220 of the carton cover 200. The second engaging portion 230 functions as a latch. That is, the carton cover 200 is fixed to the carton 100 by engaging the second engaging portion 230 with the first engaging portion 110.

[0073] Furthermore, a first groove 240 is formed on the side portion 220 to alleviate stress. Specifically, the first groove 240 is provided all around the circumference of the side portion 220. In addition, the first groove 240 is arranged radially at a right angle relative to the axis of rotation J.

[0074] The shape of the first groove 240, for example, when viewed in cross-section of the side portion 220 from a first direction, includes a first inclined portion 241 that is inclined toward the planar portion 210 relative to the outer side 221 and extends toward the inner side 222, a second inclined portion 242 that is inclined toward the side opposite to the planar portion 210 relative to the outer side 221 and extends toward the inner side 222, and a bottom 243 connecting the first inclined portion 241 and the second inclined portion 242. In other words, when viewed in cross-section of the side portion 220 including the rotation axis J of the bar shaft 33, the first groove 240 becomes trapezoidal in shape.

[0075] also, Figure 10 The first direction shown indicates the left side from the right side of the paper, but as mentioned above, since it is a direction intersecting the axis along the rotation axis J, therefore... Figure 10 The image observed in the middle can also be an image observed from the first direction.

[0076] Thus, since a first groove 240 is formed on the side portion 220 of the carton cover 200, during assembly, when the carton cover 200 is installed on the carton 100, when the side portion 220 of the carton cover 200 is expanded to engage the first engaging portion 110 with the second engaging portion 230 (see reference...) Figure 19A , Figure 19B The first groove 240 allows the side portion 220 to deform relative to the force applied from the inner side 222 of the barrel cover 200, and can mitigate the force applied to the side portion 220 by means of the first groove 240. Therefore, when the first engaging portion 110 engages with the second engaging portion 230, the shape of the expanded side portion 220 of the barrel cover 200 can be restored to its original shape, and warping of the barrel cover 200 can be suppressed. Thus, for example, it is possible to prevent the barrel cover 200 from being thickened in order to increase the rigidity of the barrel cover 200, and to suppress the enlargement of the barrel wheel 1000, the movement 10, and the watch 1.

[0077] Furthermore, since the first groove 240 is trapezoidal, a portion of the side portion 220 can be thinned, reducing the rigidity of the side portion 220. Deformation can occur at the thinned portion, thus alleviating the stress applied to the side portion 220 around the second engaging portion 230, specifically the pressure applied from the inner side surface 222 to the outer side surface 221 of the side portion 220. Therefore, when the first engaging portion 110 engages with the second engaging portion 230, the shape of the expanded side portion 220 of the carton cover 200 can be restored to its original shape.

[0078] As described above, the barrel wheel 1000 of this embodiment is a barrel wheel 1000 that rotates using the mainspring 30 as a power source. It has: a second barrel shaft 33 having a rotation axis J; a barrel 100 for storing the mainspring 30; and a barrel cover 200, which is mounted on the barrel 100 to form a storage space 200A for storing the mainspring 30. The barrel cover 200 has: a flat portion 210 extending along a first direction that intersects the axial direction along the rotation axis J; and a side portion 220 extending from the end of the flat portion 210 along a second direction that intersects the first direction. The side portion 220 has a second engaging portion 230, which engages with a first engaging portion 110 formed on the barrel 100 to fix the barrel cover 200 to the barrel 100. A first groove 240 for buffering stress is formed in the side portion 220.

[0079] According to this structure, a first groove 240 is formed around the entire circumference of the side portion 220 of the carton cover 200. Specifically, the first groove 240 is formed near the second engaging portion 230. Therefore, during assembly, when the carton cover 200 is installed on the carton 100, and the side portion 220 of the carton cover 200 is expanded to engage the first engaging portion 110 with the second engaging portion 230, the force applied to the side portion 220 relative to the force applied from the inner side surface 222 of the carton cover 200 can be mitigated by the first groove 240. Therefore, when the first engaging portion 110 engages with the second engaging portion 230, the shape of the expanded side portion 220 of the carton cover 200 can be restored to its original shape, and warping of the carton cover 200 can be suppressed. Therefore, for example, the thickness of the barrel cover 200 can be increased without increasing the rigidity of the barrel cover 200, thus preventing the barrel wheel 1000, movement 10, and watch 1 from becoming too large.

[0080] Alternatively, the overall thickness of the side portion 220 of the barrel cover 200 could be reduced. However, by reducing the overall thickness of the side portion 220, it would be difficult to remove the barrel cover 200 when repairing the watch 1, potentially reducing the operability of after-sales service. However, as in this embodiment, by providing a first groove 240 in a portion of the side portion 220, the operability of after-sales service can be ensured, and the warping of the barrel wheel 1000 can be suppressed.

[0081] Furthermore, in the carton wheel 1000 of this embodiment, it is preferable that, when the cross-section of the side portion 220 is viewed from a first direction, the first groove 240 has: a first inclined portion 241, which is inclined toward the planar portion 210 and extends toward the inner side portion 222 relative to the outer side portion 221; a second inclined portion 242, which is inclined toward the side opposite to the planar portion 210 and extends toward the inner side portion 222 relative to the outer side portion 221; and a bottom 243, which connects the first inclined portion 241 and the second inclined portion 242. According to this structure, the first groove 240 has the first inclined portion 241, the second inclined portion 242, and the bottom 243, thus allowing a portion of the side portion 220 to be thinned, thereby reducing the rigidity of the side portion 220. Therefore, during assembly, deformation can occur at the thinned portion to alleviate the stress on the side portion 220 applied to the periphery of the second engaging portion 230, specifically the pressure applied from the inner side portion 222 to the outer side portion 221. Therefore, when the first engaging part 110 engages with the second engaging part 230, the shape of the expanded side part 220 of the carton cover 200 can be restored to its original shape.

[0082] Furthermore, the movement 10 of this embodiment includes: the barrel wheel 1000 described above; a display gear train 90 driven by the barrel wheel 1000; a base plate 11 on which the barrel wheel 1000 is disposed; and a gear train clamping plate 14, which, together with the base plate 11, supports the barrel wheel 1000 and the display gear train 90. According to this structure, since the barrel wheel 1000 is included, a movement 10 that minimizes the need for large-scale operation can be provided.

[0083] Furthermore, the clock 1 of this embodiment includes the movement 10 described above and an outer casing 2 for housing the movement 10. With this structure, since the movement 10 is included, a clock 1 that minimizes its size can be provided.

[0084] Hereinafter, variations of the above-described embodiments will be described.

[0085] As mentioned above, the shape of the first groove 240 is not limited to a trapezoidal shape, but can also be... Figure 11 The shape shown. (As shown) Figure 11 As shown, in the carton wheel 1000A of Modified Example 1, when observing the cross section of the side portion 220 including the axis of rotation J, the shape of the first groove 240A is quadrilateral. Specifically, the first groove 240A is provided on the outer side surface 221 of the side portion 220 and extends radially from the outer side surface 221 toward the inner side surface 222.

[0086] Thus, the first groove 240A is radially disposed on the outer side surface 221 of the side portion 220, thereby making a portion of the side portion 220 thinner and reducing the rigidity of the side portion 220. Therefore, deformation can occur at the thinned side portion 220 to alleviate the stress applied to the periphery of the side portion 220 around the second engaging portion 230, specifically the pressure applied from the inner side surface 222 of the side portion 220 to the outer side surface 221. As a result, when the first engaging portion 110 engages with the second engaging portion 230, the shape of the expanded side portion 220 of the carton cover 200 can be restored to its original shape.

[0087] Alternatively, the shape of the first groove 240 can also be Figure 12 The shape shown. (As shown) Figure 12 As shown, in the carton wheel 1000B of Modified Example 2, when observing the cross-section of the side portion 220 including the rotation axis J, the shape of the first groove 240B is rectangular from the end face 223 toward the thrust direction. Specifically, the first groove 240B is provided on the end face 223 of the side portion 220 and extends parallel to the rotation axis J from the end face 223 toward the flat portion 210.

[0088] Thus, the first groove 240B extends from the end face 223 toward the flat portion 210, in other words, it extends in the direction of thrust, thereby thinning a portion of the side portion 220 and reducing the rigidity of the side portion 220. Therefore, during assembly, deformation can occur at the thinned side portion 220 to alleviate the stress applied to the side portion 220 around the second engaging portion 230, specifically the pressure applied from the inner side surface 222 to the outer side surface 221 of the side portion 220. As a result, when the first engaging portion 110 engages with the second engaging portion 230, the shape of the expanded side portion 220 of the carton cover 200 can be restored to its original shape. Furthermore, since the first groove 240B is formed closer to the second engaging portion 230, the pressure applied to the side portion 220 can be further alleviated.

[0089] In addition, the shape of the first groove 240 can also be Figure 13 The shape shown. (As shown) Figure 13 As shown, in the carton wheel 1000C of Modified Example 3, when observing the cross-section of the side portion 220 including the axis of rotation J, the shape of the first groove 240C is rectangular, extending obliquely downward from the outer side portion 221. Specifically, the first groove 240C is inclined relative to the outer side portion 221 and extends to the side opposite to the plane portion 210.

[0090] Thus, the first groove 240C extends obliquely from the outer side surface 221 towards the side opposite to the flat surface 210, thereby thinning a portion of the side surface 220 and reducing its rigidity. Therefore, during assembly, deformation can occur at the thinned side surface 220, easing the stress applied to the periphery of the second engaging portion 230 on the side surface 220, specifically the pressure applied from the inner side surface 222 to the outer side surface 221 of the side surface 220. Consequently, when the first engaging portion 110 engages with the second engaging portion 230, the expanded side surface 220 of the carton cover 200 can be restored to its original shape.

[0091] Alternatively, the shape of the first groove 240 can also be Figure 14 The shape shown. (As shown) Figure 14 As shown, in the carton wheel 1000D of Modified Example 4, when observing the cross-section of the side portion 220 including the axis of rotation J, the shape of the first groove 240D is formed as a V-shape. Specifically, the first groove 240D has: a first inclined portion 240D1, which is inclined toward the planar portion 210 relative to the outer side 221 and extends toward the inner side 222; and a second inclined portion 240D2, which is inclined toward the side opposite to the planar portion 210 relative to the outer side 221 and extends toward the inner side 222, the second inclined portion 240D2 being connected to the first inclined portion 240D1.

[0092] Thus, the first groove 240D is formed into a V-shape, which allows a portion of the side portion 220 to become thinner, thereby reducing the rigidity of the side portion 220. Therefore, during assembly, deformation can occur at the thinned side portion 220 to alleviate the stress applied to the side portion 220 around the second engaging portion 230, specifically the pressure applied from the inner side surface 222 to the outer side surface 221 of the side portion 220. Consequently, when the first engaging portion 110 engages with the second engaging portion 230, the shape of the expanded side portion 220 of the carton cover 200 can be restored to its original shape.

[0093] Alternatively, the shape of the first groove 240 can also be Figure 15 The shape shown. (As shown) Figure 15 As shown, in the carton wheel 1000E of Modified Example 5, when observing the cross-section of the side portion 220 including the axis of rotation J, the shape of the first groove 240E is formed into a U-shape. Specifically, the first groove 240E has: a first extension 240E1 that extends from the outer side 221 to the inner side 222; a second extension 240E2 that extends from the outer side 221 to the inner side 222; and an arc portion 240E3 that connects the first extension 240E1 and the second extension 240E2 and includes an arc shape. In addition, the arc is not limited to a perfect circle, but can also be a non-perfect circle.

[0094] Thus, the first groove 240E is formed into a U-shape, which allows a portion of the side portion 220 to be thinned, thereby reducing the rigidity of the side portion 220. Therefore, during assembly, the thinned surface of the side portion 220 can be used to disperse the force and alleviate the stress applied to the side portion 220 around the second engaging portion 230, specifically the pressure applied from the inner side surface 222 to the outer side surface 221 of the side portion 220. As a result, when the first engaging portion 110 engages with the second engaging portion 230, the shape of the expanded side portion 220 of the carton cover 200 can be restored to its original shape.

[0095] Alternatively, the shape of the first groove 240 can also be Figure 16 The shape shown. (As shown) Figure 16 As shown, in the carton wheel 1000F of Modified Example 6, when observing the cross-section of the side portion 220 including the axis of rotation J, the shape of the first groove 240F has an arc shape with an opening on the outer side portion 221. Furthermore, the arc is not limited to a perfect circle; it can also be a non-perfect circle.

[0096] Thus, the first groove 240F is formed into an arc shape, which allows a portion of the side portion 220 to be thinned, thereby reducing the rigidity of the side portion 220. Therefore, during assembly, the thinned surface of the side portion 220 can be used to disperse the force and alleviate the stress applied to the side portion 220 around the second engaging portion 230, specifically the pressure applied from the inner side surface 222 to the outer side surface 221 of the side portion 220. As a result, when the first engaging portion 110 engages with the second engaging portion 230, the shape of the expanded side portion 220 of the carton cover 200 can be restored to its original shape.

[0097] In addition, the shape of the first groove 240 can also be Figure 17 The shape shown. (As shown) Figure 17 As shown, in the carton wheel 1000G of Modified Example 7, when observing the cross-section of the side portion 220 including the axis of rotation J, a first groove 240G1 and a second groove 240G2 are formed in the side portion 220. In Modified Example 7, the first groove 240G1 is formed, for example, in a quadrilateral shape. The second groove 240G2 is formed, for example, in a V-shape. Furthermore, the shapes of the first groove 240G1 and the second groove 240G2 can also be combined with any of the shapes of the first grooves 240, 240A, 240C to 240F described above. In addition, a first groove 240B that is rectangular from the end face 223 of the side portion 220 toward the thrust direction can also be formed. Furthermore, it is not limited to two grooves 240G1 and 240G2; three or more grooves can also be formed.

[0098] Thus, because the first groove 240G1 and the second groove 240G2 are formed on the side portion 220, a portion of the side portion 220 can be made thinner, thereby reducing the rigidity of the side portion 220. Therefore, during assembly, the stress applied to the periphery of the side portion 220 around the second engaging portion 230, specifically the pressure applied from the inner side surface 222 to the outer side surface 221 of the side portion 220, can be mitigated by the dispersion of the two grooves 240G1 and 240G2. As a result, when the first engaging portion 110 engages with the second engaging portion 230, the shape of the expanded side portion 220 of the carton cover 200 can be restored to its original shape.

[0099] In addition, the shape of the first groove 240 can also be Figure 18 The shape shown. (As shown) Figure 18 As shown, in the carton wheel 1000H of Modified Example 8, when observing the cross-section of the side portion 220 including the axis of rotation J, a first groove 240H is provided on the inner side surface 222 of the side portion 220. Specifically, the first groove 240H extends in a quadrilateral shape from the inner side surface 222 of the side portion 220 toward the outer side surface 221. Furthermore, the shape of the first groove 240H can be any of the shapes described above for the first grooves 240, 240C to 240F.

[0100] Thus, since the first groove 240H is formed on the inner side surface 222 of the side portion 220, a portion of the side portion 220 can be thinned, thereby reducing the rigidity of the side portion 220. Therefore, during assembly, the thinned side portion 220 can disperse and alleviate the stress applied to the periphery of the side portion 220 around the second engaging portion 230, specifically the pressure applied from the inner side surface 222 to the outer side surface 221 of the side portion 220. Consequently, when the first engaging portion 110 engages with the second engaging portion 230, the shape of the expanded side portion 220 of the carton cover 200 can be restored to its original shape.

[0101] Furthermore, as mentioned above, the first groove 240 is not limited to being formed around the entire circumference of the side portion 220 of the carton cover 200; it may also be formed partially or interrupted. The same applies to the second groove 240G2.

[0102] As described above, the second carton wheel 31 has been described as the carton wheel 1000 in this embodiment, but it is not limited thereto, and the first carton wheel 21 may also be used as the carton wheel 1000.

[0103] As described above, the first engaging portion 110 is described as a recess and the second engaging portion 230 as a protrusion, but this is not a limitation. The first engaging portion 110 may be a protrusion and the second engaging portion 230 may be a recess. In addition, as long as the carton cover 200 is fixed to the carton 100, the first engaging portion 110 and the second engaging portion 230 may adopt various structures.

Claims

1. A barrel wheel that rotates using a mainspring as a power source. The carton wheel has: A bar shaft, which has an axis of rotation; A barrel holder that holds the mainspring; as well as A barrel cover, which is installed on the barrel, forms a storage space for storing the mainspring. The carton lid has: a planar portion extending along a first direction that intersects an axial direction along the axis of rotation; and a side portion extending from an end of the planar portion along a second direction that intersects the first direction. The side portion has a second engaging portion that secures the carton lid to the carton by engaging with a first engaging portion formed on the carton. A first groove for buffering stress is formed on the side surface.

2. The carton wheel according to claim 1, wherein, The first groove is disposed on the end face of the side portion. When observing the cross-section of the side portion containing the axis of rotation, the first groove extends from the end face toward the flat portion parallel to the axis of rotation.

3. The carton wheel according to claim 1, wherein, The first groove is disposed on the inner side of the side portion. When observing the cross-section of the side portion including the axis of rotation, the first groove extends from the inner side to the outer side.

4. The carton wheel according to claim 1, wherein, The first groove is disposed on the outer side of the side portion. When observing the cross-section of the side portion including the axis of rotation, the first groove extends from the outer side towards the inner side.

5. The carton wheel according to claim 4, wherein, When the cross-section is observed, the first groove has: a first inclined portion that is inclined relative to the outer side of the planar portion and extends toward the inner side; a second inclined portion that is inclined relative to the outer side of the planar portion and extends toward the inner side; and a bottom that connects the first inclined portion and the second inclined portion.

6. The carton wheel according to claim 4, wherein, When the cross-section is observed, the first groove is inclined relative to the outer side surface and extends to the side opposite to the planar portion side.

7. The carton wheel according to claim 4, wherein, When the cross-section is observed, the first groove has: a first inclined portion that is inclined relative to the outer side of the planar portion and extends toward the inner side; and a second inclined portion that is inclined relative to the outer side of the planar portion and extends toward the inner side, the second inclined portion being connected to the first inclined portion.

8. The carton wheel according to claim 4, wherein, When the cross-section is observed, the first groove has an arcuate shape that opens on the outer side.

9. The carton wheel according to claim 4, wherein, When the cross-section is observed, the first groove has: a first extension extending from the outer side to the inner side; a second extension extending from the outer side to the inner side; and an arcuate portion connecting the first extension and the second extension, and having an arcuate shape.

10. The carton wheel according to any one of claims 4-9, wherein, A second groove is formed at a position on the side surface that is different from the position where the first groove is formed.

11. A movement comprising: The carton wheel according to any one of claims 1-10; A gear train, driven by the carton wheels; The base plate on which the carton wheels are mounted; as well as A wheel train clamp, which, together with the base plate, supports the carton wheel and the wheel train.

12. A clock, comprising: The movement as claimed in claim 11; and A housing for the movement.

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