JP4838672B2 - Sweep hand clock - Google Patents

Description

  The present invention relates to a sweeping timepiece of a pointer display type that includes a two-pole step motor and has a pointer that sweeps smoothly, and more particularly to a configuration of a sweeping timepiece that performs simple sweeping.

  A sweeping hand of a timepiece display type timepiece having a two-pole step motor of a conventional timepiece has a structure in which a beard wheel to which a hairspring is elastically coupled, an oil rotor, and an idler are newly provided (see, for example, Patent Document 1). This is achieved by a structure (for example, see Non-Patent Document 1) or the like provided with a 3rd wheel that is elastically coupled with a coil spring and a 4th wheel that interposes grease.

Further, the conventional gear is manufactured by tooth splitting by pressing or cutting (see, for example, Patent Document 2), and is often used as a gear of a number wheel constituting a train wheel of a watch (for example, , See Patent Document 3).
Japanese Laid-Open Patent Publication No. 64-78187 (Figs. 1 and 3) Japanese Laid-Open Patent Publication No. 2003-194964 (page 3, FIG. 2) International Publication No. 01/009687 pamphlet (pages 8-9, FIG. 1) Japan Patent Office homepage, reference room, other reference information, standard technology collection, basic technology of new generation electronic watch and its extension (3-3-3-2 sweep rotation mechanism)

  However, the conventional problems described in Patent Document 1 and Non-Patent Document 1 still have the following problems. In other words, the sweep rotation mechanism of the pointer display type timepiece equipped with a two-pole step motor newly requires a wheel train exclusively for sweep operation of a spring wheel in which at least a fine spring is elastically coupled and a load intermediate wheel having a load torque of viscous fluid. There is a problem that is restricted by the watch size. Furthermore, the spring wheel requires a support member that supports both ends of the spring, and the load intermediate wheel requires a cavity for inserting a viscous fluid, which has a problem of being restricted by the watch thickness.

  As described above, in order to realize the sweep operation of the pointer display type timepiece equipped with the two-pole step motor, a dedicated wheel train is required, resulting in an increase in cost, which is not suitable for diverting an inexpensive timepiece. In addition, according to the method for manufacturing a timepiece component used in Patent Document 2 and Patent Document 3, it is difficult to process with a special shape, and there is a problem that bending and warping occur and dimensional accuracy decreases.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a simple sweep hand of a pointer display type timepiece having a two-pole step motor at a low cost without changing the size of the timepiece. That is.

In order to solve the above-mentioned problems, a sweep hand clock according to the present invention has a gear train mechanism composed of a plurality of gears for transmitting the rotation of a step motor, and is attached to some of the plurality of gears. and the sweep hand motion timepiece hands Ru smoothly is swept hand movement to a particular gear of the plurality of gears is formed in a wheel shape having a plurality of teeth on an outer peripheral portion, the rotation of the step motor A gear portion that receives and rotates, a base portion formed in the center portion of the gear on the same plane as the gear portion, and disposed between the base portion and the gear portion, and one end connected to the base portion coupled to said gear portion and the other end while being a spiral spring in which the gear unit is formed in a spiral shape in the direction of rotation to the other end from the one end, made from the gear unit is the step motor said of the Wherein by rotating undergoing rolling spiral spring is wound, by the base unit to rotate with the said restored when the spiral spring wound is restored, to relax the rotation from the step motor Then, the pointer is swept.

  That is, the rotor that rotates step by the two-pole step motor is transmitted to the fifth wheel and fourth wheel. The fifth gear rotates stepwise, but the fifth pinion is displaced in the rotational direction by a spiral spring in the fifth gear and restored to perform a simple sweep rotation (pick rotation). Further, the fourth gear rotates in a simple sweep (pick-up rotation). However, the fourth pinion or the fourth gear is displaced in the rotational direction by a spiral spring in the fourth gear and can be restored to perform a simple sweep rotation.

  In other words, the 5th gear and the 4th tooth have a fine spring that displaces in the rotational direction, making it easy to move the sweep hand.There is no need for a special train wheel for the swept hand movement. It becomes possible.

  Further, the fifth gear and the fourth gear are manufactured by high-precision transfer by photolithography.

  Since the electroforming material is deposited on the mold obtained based on the high-precision pattern drawn on the photomask, the dimensional system of parts is compared with the conventional technology manufactured through several processing steps. As well as improving, complex shapes can be manufactured.

  According to the present invention as described above, by using the displacement and restoration of the fifth gear and the fourth gear by the fine spiral spring, it is possible to easily perform the simple sweep hand movement of the pointer display type timepiece having the two-pole step motor. Become.

  According to the present invention, a simple sweep hand-operated timepiece can be obtained with a pointer display provided with a two-pole step motor, and the commercial value of the timepiece is improved. Furthermore, there is an effect that a simple sweep hand movement can be realized with low power consumption, time accuracy, downsizing and thinning equivalent to a step hand clock.

  A sweep hand clock according to the present invention is a quartz timepiece of a pointer display type, and is a two-pole stepping motor comprising a coil block 130 composed of a coil and a magnetic core, a stator 132, a rotor pinion 134a, and a rotor 134 composed of a rotor magnet 134b. A fifth wheel 140 driven by this two-pole stepping motor, a fourth wheel 142 in which rotation of the fifth wheel 140 is transmitted in order while decelerating, a third wheel 150, and a second wheel 152 to which a minute hand is attached. In each wheel, a train wheel is formed, and the pointer smoothly sweeps.

  The sweep hand-operated timepiece includes a winding stem 110, a switching device including a winding stem presser 166 that holds the winding stem 110 in a plurality of positions in the axial direction, and a switching lever 180, and the rotation of the winding stem 110 drawn out by the switching device. Are connected to the second wheel 152 and the hour wheel 160 to which the hour hand is attached.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an external view of a fourth wheel & pinion according to an embodiment of the present invention. The fourth wheel & pinion 142 includes a fourth pinion 142a and a fourth gear 142b, and includes a spiral spring 142c coupled from the center of the fourth gear 142b to the outer periphery of the fourth gear 142b. More specifically, the fourth gear 142b is formed in a wheel shape and has a plurality of teeth 142d on the outer periphery, and the gear 142e that rotates the teeth 142d in response to the rotation from the step motor ; A base part 142f formed on the same surface as the gear part and in the center part, and is arranged between the base part 142f and the gear part, and one end is connected to the base part and the other end is the gear part. 142e, and a spiral spring 142c spirally formed in the direction in which the gear portion rotates from the one end to the other end (the direction of the arrow in FIG. 1), and the gear portion 142e is wherein by rotating by receiving rotation from the step motor spiral spring 142c is wound, said base 142f when the spiral spring 142c wound is restored with the said restoration times By has a structure that is swept hand movement of the pointer by alleviating the rotation from the stepping motor.

On the other hand, FIG. 2 is an external view of the fifth wheel & pinion according to the embodiment of the present invention. The fifth wheel & pinion 140 is composed of a fifth pinion 140a and a fifth gear 140b, and includes a spiral spring 140c coupled from the center of the fifth gear 140b to the outer periphery of the fifth gear 140b. More specifically, the fifth gear 140b is also formed in a wheel shape, and has a plurality of teeth 140d on the outer peripheral portion, and the gear 140e that rotates the teeth 140d in response to the rotation from the step motor ; A base portion 140f formed on the same surface as the gear portion and formed in the center portion, and disposed between the base portion 140f and the gear portion, and one end is connected to the base portion and the other end is the gear portion. coupled to 140e, moreover a spiral spring 140c in which the gear unit to the other end from the one end is formed in a spiral shape in the direction of rotation (arrow direction in FIG. 2) consists, the gear portion 140e is the wherein by rotating by receiving rotation from the step motor spiral spring 142c is wound, said base 140f when the spiral spring 140c wound is restored along with the restore times By has a structure that is swept hand movement of the pointer by alleviating the rotation from the stepping motor.

  FIG. 3 is a plan view showing a schematic shape on the front side of the movement according to the embodiment of the present invention, and FIG. 4 is a cross-sectional view of FIG. 3 and 4, the movement (machine body) 100 of the timepiece has a main plate 102 and a train wheel bridge 112 that constitute a substrate of the movement.

  The rotor 134 step-rotated by the two-pole step motor is transmitted to the fifth wheel & pinion 140 and the fourth wheel & pinion 142 to which the second hand 144 is attached. The fifth gear 140b meshing with the rotor pinion 134a rotates stepwise, but the fifth pinion 140a is displaced in the rotational direction by the spiral spring 140c in the fifth gear 140b and restored to perform a simple sweep rotation (pick rotation).

  Further, the fourth gear 142b that meshes with the fifth pinion 140a rotates in a simple sweep (pick-up rotation). Rotate.

  The spiral spring 140c in the fifth gear 140b and the spiral spring 142c in the fourth gear 142b are electroformed materials having a fine structure formed based on a fine pattern of a photomask by using a photolithography technique. The electroformed material can be formed from any one of an alloy of Ni and Co, Ni simple substance, and Co simple substance.

  Therefore, since it is manufactured by high-precision transfer by photolithography, there is an advantage that it is suitable for mass production and can reduce the product unit price.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. The best configuration, method, and the like for carrying out the present invention have been disclosed above, but the present invention is not limited to this.

  In the above embodiment, a dedicated train wheel for the sweep hand movement is not required, and as a result, a simple sweep hand clock of a pointer display timepiece having a two-pole step motor at a low cost without changing the size of the watch. Is to provide. For example, it is needless to say that full-scale sweep operation is possible by adding a dedicated part and meshing a load intermediate wheel having a load torque of viscous fluid with one of the reduction gear trains from the rotor to the fourth wheel.

  Needless to say, the pointer is not limited to the pointer display type timepiece equipped with a two-pole step motor, and the needle can be swept more smoothly by forming a spiral microspring on a gear train, for example, the fourth gear. .

  That is, although the present invention has been illustrated and described with particular reference to particular embodiments, it will be appreciated that the embodiments described above are not limited in shape to the embodiments described above without departing from the scope of the technical idea and objects of the present invention. Various modifications can be made by those skilled in the art in other detailed configurations.

  Accordingly, the description of the shape and the like disclosed above is illustrative only for easy understanding of the present invention and does not limit the present invention. The description by the name of the member which removed the limitation of the part or the whole is included in the present invention.

1 is an external view of a fourth wheel & pinion according to an embodiment of the present invention. It is an external view of the fifth wheel & pinion which concerns on embodiment of this invention. It is a top view which shows the schematic shape of the front side of the movement which concerns on embodiment of this invention. FIG. 4 is a cross-sectional view of FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Movement 102 Base plate 108 Stitch wheel 110 Winding stem 112 Train wheel bridge 130 Coil block 132 Stator 134 Rotor 134a Rotor pinion 134b Rotor magnet 140 Fifth wheel 140a Fifth pinion 140b Fifth gear 140c Spiral spring 140d Teeth 140e Gear part 140f Base part 142 Second wheel 142a Fourth wheel 142b Fourth gear 142c Spiral spring 142d Teeth 142e Gear portion 142f Base 144 Second hand 152 Second wheel 150 Third wheel 160 Hour wheel 166 Winding presser 174 Day wheel 180 Switch lever

Claims (5)

Has a gear train mechanism comprising a plurality of gears for transmitting rotation of the step motor, the smooth sweep hand motion timepiece Ru is swept hand movement guidance attached to a portion of the gear of the plurality of gears,
A specific gear of the plurality of gears is
A gear portion that is formed in a wheel shape, has a plurality of teeth on the outer peripheral portion, and rotates by receiving the rotation from the step motor ;
A base formed on the same surface as the gear portion and at the center of the gear ;
It is arranged between the base and the gear part, and one end is connected to the base and the other end is connected to the gear part, and the gear part rotates in a direction rotating from the one end to the other end. A spiral spring formed in a spiral shape,
By said by the gear unit is rotated by the rotation of the step motor spiral spring is wound, the said base portion when said spiral spring wound restores rotating with the said recovery, sweep hand motion timepiece, characterized in that is swept hand movement of the pointer by relieving the rotation from the stepping motor.   2. The sweep according to claim 1, wherein the spiral spring is a microstructure spring made of an electroformed material having a microstructure formed based on a micropattern of a photomask by using a photolithography technique. Hand clock.   3. The sweep hand clock according to claim 2, wherein the electroformed material is made of any one of an alloy of Ni and Co, Ni simple substance, and Co simple substance. The sweep hand clock according to any one of claims 1 to 3 , wherein the base, the spiral spring, and the gear portion are integrally formed. The specific gear, a fifth gear that rotates by receiving the rotation from the step motor directly out of the fourth gear rotates by receiving rotation from the fifth gear directly, at least one gear The sweep hand-operated timepiece according to any one of claims 1 to 4, wherein the sweep hand-operated timepiece is provided.

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