JPH0943363A - Setting gear train mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a setting gear train mechanism which can remove the loss of the rotational torque of movement, and can suppress the vibration noise by the backlash of the gear. SOLUTION: A setting gear train are always in gear with a setting pinion 46, and further shift in axial direction together with the setting pinion 46. This train 54 is usually out of gear with a hand correcting gear 60, being energized by an elastic member 56, and gear with the hand correcting gear 60 at the point of time when it shifts in the axial direction together with the setting pinion 46. Moreover, the train 54 is pressed, being energized by the elastic member 56.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrected train wheel gear mechanism for correcting the time of a table clock or an analog timepiece mounted on an automobile or the alarm time of an alarm clock.

[0002]

2. Description of the Related Art A conventional correction train wheel gear mechanism of this type is shown in FIG. That is, the cylindrical support portion 2a that supports the correction shaft 4 on the case 2 and the shaft portion 2 that supports the plurality of gears 6 to 10 forming the correction train wheel 12 respectively.
b-2d are provided, and gears 6-10 are provided on the shafts 2b-2d using washers 14-18 and screws 20-24.
Is rotatably attached. The gears 6 to 10 are successively meshed with each other, and the gear 10 at the final stage thereof is always meshed with the needle matching gear 26 of the movement. Also,
A correction pinion 28 is attached to the tip of the correction shaft 4 provided so as to pass through the support portion 2a, and is in a state of being rotatable with the correction shaft 4 and simultaneously movable in the axial direction. A coil spring 30 is externally fitted to the correction shaft 4, and axially biases the correction pinion 28 to move the correction pinion 28 to a position where it does not mesh with the gear 6. To correct the time in this correction train wheel gear mechanism, the correction shaft 4 is pulled upward to engage the correction pinion 28 with the gear 6 of the correction wheel train 12, and the correction shaft 4 is rotated to rotate the correction pinion 28 and the gear 6. By rotating. When the gear 6 is thus rotated, the gears 8 and 10 are sequentially rotated, the needle matching gear 26 meshing with the gear 10 is rotated, the pointer is rotated, and the time is corrected.

[0003]

In the above-mentioned conventional example, the correction train wheel 12 is always meshed with the movement through the needle matching gear 26. For this reason, the correction train wheel 12 always rotates not only during the correction operation, but the movement requires extra rotation torque.

In the above conventional example, the correction train wheel 1 is also used.
If 2 does not rotate smoothly at all times, the loss will be large. Therefore, the correction train wheel 12 is arranged with appropriate play in the axial direction or the meshing direction. For this reason, when the entire timepiece vibrates like a vehicle-mounted timepiece, or when each gear rotates, vibration noise (chattering noise) may occur due to the play of the gears.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to eliminate the loss of the rotational torque of the movement due to the constant rotation of the correction train wheel, and to suppress the vibration noise due to the play of the gears. (EN) Provided is a modified train wheel gear mechanism.

[0006]

The correction train wheel gear mechanism of the present invention is a timepiece in which the time is corrected by rotating the needle matching gear of the movement by externally operating the correction shaft and rotating with the correction shaft. An axially movable correction pinion, a correction wheel train that meshes with the correction pinion and moves axially by engagement to mesh with the needle matching gear when the correction pinion moves, and the correction wheel train. And an elastic member for urging the correction train wheel so that the needle matching gear is brought into a non-meshing state.

[0007]

In the correction train wheel gear mechanism of the present invention, the correction train wheel always meshes with the correction pinion and further moves in the axial direction together with the correction pinion. The correction train wheel is normally urged by the elastic member so as not to mesh with the needle matching gear, and meshes with the needle matching gear when it moves in the axial direction together with the correction pinion. For this reason, the correction train wheel is usually separated from the needle matching gear and does not impose an extra load on the movement. Further, since the correction train wheel is biased and pressed by the elastic member, vibration noise is not generated due to the play.

[0008]

1 is a cross-sectional view of essential parts showing a modified train wheel gear mechanism according to an embodiment of the present invention. In the figure, reference numeral 40 denotes a case that also serves as a main plate, and has a cylindrical support portion 40a that rotatably supports a correction shaft, which will be described later, and a shaft portion 40b that rotatably supports each gear of the correction train wheel, which will be described later. -40d are provided side by side. The shaft portions 40b, 40c are root portions 40g, 40 more than the tip portions 40e, 40f to which gears are attached.
The diameter of h is larger, and step portions 40i and 40j are formed at the boundary.

Reference numeral 42 denotes a correction shaft, which is rotatably supported through the supporting portion 40a and is movable in the axial direction. A correction knob 44, which also functions as a stopper, is attached to one end of the correction shaft 42, and the correction pin 4 is attached to the other end.
6 is fixed.

Reference numerals 48 to 52 are gears constituting the correction train wheel 54, and the gears 48 and 50 are attached to the tip portions 40e and 40f of the shaft portions 40b and 40c, respectively, so as to be rotatable and axially movable. Further, the gear 52 as a correction gear is attached to the shaft portion 40d in a rotatable and axially movable state. These gears 48, 50
Are flange portions 48a and 50a which both project annularly,
The first tooth portion 48 provided so as to sandwich this from the axial direction
b, 50b and second tooth portions 48c, 50c. The gears 48 constituting such a correction train wheel 54-
The gear 52, its gear 48 and the correction pinion 46 are arranged so as to always mesh with each other. That is, the correction pinion 46 meshes with the first tooth portion 48b of the adjacent gear 48, and the end surface 46a thereof is engaged with the flange portion 48a. Further, the gear 48 has the first tooth portion of the gear 50 to which the second tooth portion 48c is adjacent.
The end surface 48d is engaged with the tooth portion 50b, the end surface 48d is on the flange portion 50a, and the flange portion 48a is on the first tooth portion 50.
The end faces 50d of b are engaged with each other. Furthermore, the gear 5
0 means that the second tooth portion 50c meshes with the adjacent gear 52 and the flange portion 50a has the end surface 52a of the gear 52.
Is engaged. As described above, the correction pinion 46 is engaged with the gear 48 from the tip end direction of the shaft portion 40b, and the gear 5
Gears 48 and 50 are attached to shaft portions 40c and 4 of 0 and 52, respectively.
It is engaged from the tip direction of 0d. Therefore, the gear 48
˜52, once assembled, will not be removed from the shafts 40b to 40d. Further, the gears 48 to 52 in the present embodiment
The axial movement range of is from the position of the correction pinion 46 to the step portions 40i and 40j of the shaft portions 40b and 40c.

Reference numeral 56 denotes an elastic member made of a coil spring, rubber or the like, which is fitted on the shaft portion 40d and compressed between the case 40 and the gear 52 so that the gear 52 does not mesh with a needle matching gear described later. That is, it is urged downward in the figure.

Reference numeral 58 is a movement, and its needle matching gear 60 is arranged adjacent to the gear 52. The needle matching gear 60 is set so that the gear 52 meshes when the gear 52 moves in the axial direction.

Next, the operation of the modified train wheel gear mechanism having the above structure will be described. Normally, it is located near the tip of the shaft portion 40d so as not to mesh with the needle matching gear 60 by being biased by the elastic member 56 of the gear 52. Therefore, the flange portion 50a is pushed by the end surface 52a of the gear 52, and the gear 50 is also positioned near the tip of the shaft portion 40c. At this time, the end surface 48d or the flange portion 48a of the gear 48 is pushed by the flange portion 50a or the end surface 50d of the gear 50, so that the gear 48 is also positioned near the tip of the shaft portion 40b. Further, the correction pinion 46 is pushed by the flange portion 48a of the gear 48 so that the correction pinion 46 is
Is pushed into the back of the.

When the correction knob 44 is pulled upward in the figure, the correction shaft 42 and the correction pinion 46 are moved upward in the axial direction. At this time, the correction pinion 46 pushes the flange portion 48a of the gear 48 to move the gear 48 in the same direction, and the gear 48 pushes the flange portion 50a of the adjacent gear 50 to move the gear 50 in the same direction. Further, due to the movement of the gear 50, the gear 52 is pushed by the flange portion 50a and moves in the same direction so as to compress the elastic member 56. As a result, the gear 52 and the needle matching gear 60 mesh with each other. Correction knob 44 in this state
Is externally operated to rotate, the correction pinion 46 rotates via the correction shaft 42, and the rotation is transmitted to the needle matching gear 60 via the gears 48 to 52 which are always meshed. As a result, the hands are rotated and the time is corrected.

After that, when the external operation of the correction knob 44 is stopped and the hand is released, the gear 48 held by the correction pinion 46 is released, and the gears 50, 52 are also released in sequence. As a result, the gear 52 is pushed back downward in the figure by the elastic member 56, whereby the gears 50, 48 and the correction pinion 46 also return to their original positions. At this time, the meshing state of the gear 52 and the needle matching gear 60 is also released.
The correction pinion 46 and the gears 48 to 5 released as described above.
In No. 2, since the gear 52 is biased downward in the figure by the elastic member 56 and the downward movement in the figure is restricted by the correction pinion 46 or the adjacent gear, the gears 48 to 52 are shown.
Also, the correction pinion 46 is elastically pressed by the elastic member 56 even in the released state, so that play and vibration noise due to the play of the gear are not generated.

Although the correction train wheel 54 in this embodiment is composed of gears 48 to 52, the number of the gears can be increased or decreased as necessary.

FIG. 3 is a cross-sectional view of essential parts showing a modified train wheel gear mechanism according to another embodiment of the present invention. In this embodiment,
The correction shaft 142 supported by the cylindrical support portion 140a of the case 140 has a correction pinion 146 and a disk-shaped convex portion 1 on the correction shaft 142.
48 is fixed. In addition, the shaft portion 14 of the case 140
The correction gear 152, which is rotatably supported by 0b, has a gear portion 152b that meshes with the correction pinion 146 and a convex portion 148.
And a flange portion 152a that engages with. The gear portion 152b of the correction gear 152 moves in the axial direction when the convex portion 148 is pulled upward in the figure together with the correction pinion 146,
At this time, it meshes with the needle matching gear 160. Further, the correction gear 152 is normally biased by an elastic member 156 provided between the flange portion 152a and the case 40 so that the correction gear 152 does not mesh with the needle matching gear 160. As described above, according to the present embodiment, since it is not necessary to provide a plurality of gears between the correction pinion and the needle matching gear, the configuration can be simplified and the size can be reduced.

According to the present invention, since the correction train wheel rotates only during the correction operation and is normally separated from the movement, extra torque for rotating the correction train wheel is not required, and the movement torque loss is eliminated. Can be prevented.

Further, since the correction train wheel and the correction pinion are constantly pressed by the elastic member, generation of vibration noise due to play of the gear can be suppressed.

Further, since each gear is prevented from being pulled out by the adjacent gear, it is not necessary to fix each gear by using washers or screws, and the number of parts can be reduced. Mass productivity can also be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of essential parts showing a modified train wheel gear mechanism according to an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part showing a conventional modified train wheel gear mechanism.

FIG. 3 is a cross-sectional view of essential parts showing a modified train wheel gear mechanism according to another embodiment of the present invention.

[Explanation of symbols]

 40 Case 40b-40d Shaft part 42 Correcting shaft 46, 146 Correcting pinna 48-52 Gear wheels 48a, 50a Flange part 48b, 50b 1st tooth part 48c, 50c 2nd tooth part 54 Correcting wheel train 56, 156 Elastic member 58 Movement 60 , 160 Needle matching gear 148 Convex portion 152 Correcting gear

Claims (3)

[Claims] 1. A timepiece which adjusts the time by rotating a needle matching gear of a movement by externally operating a correction shaft, and a correction pinion that is rotatable with the correction shaft and is movable in the axial direction. A correction wheel train that meshes with the needle matching gear by moving in the axial direction due to engagement as the correction pinion moves, and the correction wheel train and the needle matching gear are brought into a non-meshing state. A modified train wheel gear mechanism, comprising: an elastic member that biases the train wheel. 2. The correction train wheel has a gear portion that meshes with the correction pinion and a flange portion that engages with an end surface of the correction pinion, and the flange portion is pushed when the correction pinion moves in the axial direction. And a gear that moves in the axial direction, meshes with the gear, and an end surface engages with the flange portion of the gear, and when the gear moves in the axial direction, the end surface is pushed and moves in the axial direction to mesh with the needle matching gear. The correction train wheel mechanism according to claim 1, further comprising a correction gear. 3. A timepiece which adjusts the time by rotating a hand-matching gear of a movement by externally operating a correction shaft, and a correction pinion that rotates together with the correction shaft and is movable in the axial direction. It has a fixed disk-shaped convex portion, a gear portion that meshes with the correction pinion, and a flange portion that engages with the convex portion, and moves in the axial direction as the convex portion moves to move the needle. A correction gear train gear mechanism comprising: a correction gear that meshes with a gear; and an elastic member that urges the correction gear so that the correction gear and the needle matching gear are in a non-meshing state.