JPH09182878A - Hand winding type spring driving unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the exposure and overwinding of a spring. SOLUTION: In this hand winding type spring driving unit for winding the spring 5 housed inside a frame by manually rotating a winding shaft connected to the center side end of the spring 5, a peripheral wall 2a provided on a first frame 2 for surrounding the spring 5 over the entire periphery from a radial direction, a recessed part 8 formed on the peripheral wall 2a and an outward anchor projection part 9 provided on the outer side end of the spring 5 for locking the end part on an outer side of the spring 5 by being fitted to the recessed part 8 by the elastic force of the spring 5 are provided, and at the time of the excessive winding of the spring 5, the anchor projection part 9 is detached from the recessed part 8 and moved along the peripheral wall 2a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manual winding type mainspring drive unit for manually winding a mainspring.

[0002]

2. Description of the Related Art A conventional manual winding type mainspring drive unit using a mainspring as a power source has a winding shaft arranged at the center of a mainspring housed in a frame together with a speed-up gear train and an output shaft. It is provided such that the end portion is wound around the winding shaft and the outer end portion is projected to the outside of the frame and locked to the frame. For example, by bending the outer end of the mainspring into an L shape and disposing this L-shaped end on the outside of the frame, the outer end of the mainspring is wound when the winding shaft is manually rotated to wind up the mainspring. It was prevented from being drawn into the frame.

[0003]

However, in the conventional manual winding type mainspring drive unit, when the winding shaft is mistakenly rotated in the opposite direction, the end of the mainspring hooked on the frame is in the opposite direction to the winding. Will be pushed out of the frame. Therefore, when the toy is not housed in the toy and is used in the exposed state, the mainspring end may touch the user's hand or the like.

Further, in the manual winding type mainspring drive unit, since the winding shaft is pinched and rotated by the fingertip, the completion of winding the mainspring can be sensed by the rotation resistance of the winding shaft, but the winding shaft is rotated vigorously. In some cases, the mainspring may be damaged due to excessive winding before the rotation resistance is sensed.

It is an object of the present invention to provide a manual winding type mainspring drive unit capable of preventing the end portion of the mainspring from jumping out of the frame and preventing overwinding thereof.

[0006]

In order to achieve such an object, the present invention provides a mainspring in a frame which is a power source for rotating an output shaft through a speed increasing gear train, at an inner end of the mainspring. In a manual winding type mainspring drive unit for manually rotating a wound winding shaft to wind the mainspring, the peripheral wall surrounding the mainspring in the radial direction and having at least one recess is provided on the frame, while the outer end of the mainspring is provided. Further, an outward mooring convex portion which is fitted into the concave portion and locked by the elastic force of the mainspring is provided, and when the mainspring is excessively wound, the mooring convex portion moves over the concave portion and moves along the peripheral wall.

Therefore, when the mainspring is wound up too much, the mooring convex portion at the outer end of the wound mainspring gets over the concave portion and moves along the peripheral wall, and the entire mainspring rotates in the same direction as the winding shaft. I can't wind up any more. When the winding shaft is rotated in the direction opposite to the winding direction, it can rotate freely to some extent while rotating the gear train and output shaft, but the spring that gradually expands toward the outer diameter is pressed against the peripheral wall and the mainspring moves. To prevent the winding shaft from rotating.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail based on the best mode shown in the drawings.

1 to 3 show an example of an embodiment of a manual winding type mainspring drive unit according to the present invention. The manual winding type mainspring drive unit (hereinafter, simply referred to as a mainspring drive unit) 1 includes a mainspring 5 serving as a power source,
The winding shaft 6 that winds up the mainspring 5, the speed increasing gear train that transmits the rotation of the winding shaft 6 to the output shaft 7, the constant speed mechanism that keeps the rotation of the output shaft 7 constant, and the frame that houses them. It is configured. The frame is composed of a separable first frame 2 and a separable third frame 4 and a second frame 3 partitioning them, and they are separably connected to each other by press fitting a pin 18 into a hole 19.

The mainspring 5 is housed in the space between the first frame 2 and the second frame 3. First frame 2
The peripheral wall 2 that surrounds the mainspring 5 from the radial direction to the entire circumference.
a is provided by integral molding. At least one recess 8 is formed in the peripheral wall 2a. The recesses 8 are preferably provided at equal intervals, for example, at four locations along the circumferential direction of the peripheral wall 2a. As is clear from FIG. 3, the recesses 8 are formed at the four corners of a square occupying half of the first frame 2 having a substantially rectangular planar shape. In this case, the size of the peripheral wall 2a can be made as large as possible with respect to the size of the first frame 2. Each recess 8
Stands up at a relatively acute angle in the winding direction of the mainspring 5, and is connected to the inner peripheral wall surface of the peripheral wall 2a at a gentle angle in the opposite direction without a step.

At the outer end of the mainspring 5, a circular or triangular mooring convex portion 9 is formed outward with its end folded back. The mooring convex portion 9 is constantly pushed outward in the radial direction by the elastic force of the mainspring 5 and fits into the concave portion 8, and the outer end of the mainspring 5 is locked to the peripheral wall 2a by frictional force.

The end of the mainspring 5 is wound around the mainspring stop claw 20 of the winding shaft 6 and is wound by the rotation of the winding shaft 6. The winding shaft 6 and the first gear 11 on the winding shaft 6 that transmits the rotation of the winding shaft 6 to the gear train are connected via a clutch 10.
The clutch 10 includes, for example, an S-shaped arm 10a fixed to the winding shaft 6 by press fitting, and a serrated inner tooth 11a that engages when the arm 10a rotates in a direction opposite to the winding direction of the mainspring 5. First gear 1 having
And 1. Therefore, the clutch 10
When the mainspring is wound up, it is in a disconnected state to interrupt the transmission of rotational force to the first gear 11, while when the mainspring is released, is in a connected state to transmit rotational force to the first gear 11.
In the case of the present embodiment, the S-shaped arm 10a and the mainspring stop claw 20 are integrally molded by a plastic molded product.

A pinion 12a, which constitutes a speed-up gear train with the first gear 11, is provided coaxially with the output shaft 7, and the rotation transmitted to the first gear 11 via the clutch 10 is speeded up. Is transmitted to the output shaft 7. Here, a large-diameter gear 12b is provided on the output shaft 7, and the pinion 12a, the large-diameter gear 12b, and the output shaft 7 are integrally molded to form the second gear 12. Further, the rotation of the second gear 12 is simultaneously transmitted to the star gear 14b via the large diameter gear 12b → the pinion 13a of the third gear 13 → the large diameter gear 13b → the pinion 14a of the fourth gear 14. Next to the star gear 14b,
The second 15 is arranged. This second 15
The two pins 21, 21 of the bifurcated portion are alternately applied to the teeth of the star gear 14b to swing around the pin 22. The star gear 14b is provided so as to rotate only while the second 15 swings. That is, since the rotation of the star gear 14b is governed by the swing of the second 15, the rotation speed of the output shaft 7 is maintained at a constant speed.

Here, the star gear 14b of the present embodiment is formed in a star shape by setting the amount of transition to the plus side to the limit and making the tooth shape sharp. By doing so, it is possible to manufacture a die for the star gear 14b by a hobbing machine, and manufacture a certain quality product without being affected by the skill level of the operator and without using a large-scale device. It is also possible to perform maintenance easily. In this case, since the pressure angle is set to 20 degrees, the rotation of the star gear 14b and the swing of the seconds 15 are smooth.

Reference numeral 16 in FIG. 1 is a crank for moving the legs of the mainspring drive unit 1 back and forth when the mainspring drive unit 1 is used as, for example, a walking doll toy.

In the mainspring drive unit 1 thus constructed, the mainspring 5 is wound up as follows.

When the mainspring 5 is excessively wound up, the mainspring 5 is tightened so as to separate the mainspring 5 from the peripheral wall 2a, so that the mooring convex portion 9 at the outer end fitted to the concave portion 8 is deformed inward. It becomes possible, and the power to wind the mainspring 5 is passed over the concave portion 8 to move along the peripheral wall 2a. Therefore, the mainspring 5 rotates together with the winding shaft 6 to prevent further winding. That is,
Prevents the mainspring 5 from being overwound. The mooring convex portion 9 climbs over each concave portion 8 one by one while the winding is excessive, and the spring 5
It is provided so that the slip stops in a state in which the power (torsion force) stored in is sufficiently retained.

When the winding of the mainspring 5 is in a normal range, the mooring convex portion 9 fits into the concave portion 8 by the elastic force of the mainspring 5, and the outer end portion of the mainspring 5 is locked by the frictional force.

When the winding shaft 6 is rotated in the direction opposite to the winding direction, a force for spreading the mainspring 5 to the outside acts. The outermost layer of the mainspring 5 is the peripheral wall 2.
When pressed against a, the inner layer further spreads and presses it from the inside, so that most of the mainspring is prevented from further rotation in such a manner as to be in close contact with the peripheral wall 2a. Even in this case, the mainspring 5 does not project outside the frame 2 because the entire peripheral surface of the mainspring 5 is surrounded by the peripheral wall 2a.

The above-mentioned embodiment is an example of the preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. For example, in the above description, the concave portions 8 are provided at four places and the concave portions 8 are connected to each other by the arcuate peripheral wall surface, but the number is not limited to this.

[0021]

As described above, according to the manual winding type mainspring drive unit of the present invention, the mainspring in the frame serving as a power source for rotating the output shaft through the speed increasing gear train is moved to the inner end of the mainspring. In a manual winding type mainspring drive unit for manually rotating a winding shaft wound around a portion, the mainspring is surrounded from the radial direction over the entire circumference and a peripheral wall having at least one recess is provided on the frame, while the outside of the mainspring is provided. An outward mooring projection is provided at the end that is locked in the recess by the elastic force of the mainspring.When the spring is excessively wound, the mooring projection moves over the recess and moves along the peripheral wall. If is wound up too much, the convex portion of the outer spring end moves over the concave portion and moves along the peripheral wall to prevent excessive winding. That is, since the convex portion at the end of the mainspring slides along the peripheral wall and allows the mainspring to rotate, damage to the mainspring due to excessive winding can be prevented. In addition, the mainspring is completely surrounded on the outside by the peripheral wall, and even if the winding shaft is rotated in the direction opposite to the winding direction, the mainspring will only be pushed out toward the peripheral wall, so the outside edge of the mainspring will be outside the frame. The part is not exposed and the safety is improved.

[Brief description of the drawings]

FIG. 1 is a development view of a gear train showing an example of an embodiment of a manual winding type mainspring drive unit according to the present invention.

FIG. 2 is a side view showing a gear train of the manual winding type mainspring drive unit of FIG. 1 excluding a front frame.

FIG. 3 is a view showing the inside of the first frame of the manual winding type mainspring drive unit of FIG. 1;

[Explanation of symbols]

 1 Manual winding type mainspring drive unit 2 to 4 frame 2a peripheral wall 5 mainspring 6 winding shaft 7 output shaft 8 concave portion 9 holding convex portion

Claims (1)

[Claims] 1. A hand-wound mainspring that winds up a mainspring in a frame, which is a power source for rotating an output shaft via a speed-increasing gear train, by manually rotating a winding shaft wound around an inner end of the mainspring. In the drive unit, the frame is provided with a peripheral wall that surrounds the mainspring from the entire circumference in the radial direction and has at least one recess, while the outer end of the mainspring is fitted into the recess by the elastic force of the mainspring. A hand-wound mainspring drive unit, characterized in that an outward mooring convex portion is provided to be locked with, and when the mainspring is excessively wound up, the mooring convex portion moves over the concave portion and moves along the peripheral wall.