JPH045035Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an alarm setting mechanism for a clock or the like.

(Prior art) In the conventional technology, the alarm setting knob and the alarm setting pinion are frictionally connected, and a click spring, one end of which is fixed to a support plate, is latched to a ratchet cam provided on the alarm setting pinion. are doing. For this reason, when rotating the alarm setting knob in the forward direction, the alarm setting knob bends over the click spring and rotates as a result, but when rotating the alarm setting knob in the opposite direction, the click spring bends. It locks onto the ratchet cam in the alarm setting position without bending, so
The alarm setting pin cannot be rotated and slips between the alarm setting pin and the alarm setting knob. In this way, unidirectional rotation is achieved.

(Problems to be solved by the invention) According to the above-mentioned conventional technology, the click or reverse prevention spring is required as a separate part, which increases the number of parts, takes time to manufacture and assemble, and increases costs. invite

Therefore, the purpose of this invention is to reduce the number of parts,
Easily manufacture and assemble to reduce costs,
This allows for an overall compact design.

(Means for Solving the Problems) The present invention is characterized in that the alarm setting pin has a ratchet cam at its upper part, and a spring piece that applies a spring force in the axial direction is integrally formed on the outer periphery of the lower part. , is rotatably fitted into a pillar installed on the support plate. The needle driving shaft has a ratchet cam on its tip surface that engages with the ratchet cam, and a needle driving pinion is provided on its outer peripheral surface.A hole is drilled in the axial direction on the tip surface of the needle driving shaft, and this hole is connected to the tip of the column. It is fitted into the section and supported so as to be slidable in the axial direction. When the bottom of the hole and the top of the column come into contact,
This is where the needle rotation axis is restricted from moving in the direction of the alarm setting.

(Function) When setting an alarm, rotate the needle rotating shaft while pressing it with the pad of your thumb, for example. The bottom of the hole and the top of the column come into contact with the needle rotating shaft, and further movement in the direction of the alarm setting pin is restricted. The rotation is transmitted and the alarm setting is made, but when the needle rotation shaft is rotating in the opposite direction, the alarm setting cam moves away from the needle rotation shaft by both ratchet cams against the spring force of its spring piece. For this reason, both ratchet cams are disengaged, so reverse rotation is not transmitted.

(Example) An embodiment of the present invention will be described with reference to the drawings.

A pillar 2 is erected on the lower plate of the watch, which is a support plate 1. An alarm setting pinion 3 is rotatably fitted into this pillar 2. Alarm setting kana 3 is the second,
3, it fits into the pillar 2 through the center hole 3a, has a recess 3b on its upper surface concentrically with the center hole, and has a ratchet cam 3c on the upper surface of this recess. Spring pieces 3d, 3e, and 3f extend along the outer peripheral surface of the lower part of the alarm setting pinion 3. Each tip of the spring piece is bent downward. When the lower surfaces of the tips of the spring pieces 3d, 3e, and 3f are brought into contact with the upper surface 1a of the support plate 1, and the alarm setting pinion 3 is fitted to the pillar 2, the spring pieces can be bent in the alarm setting pinion 3. A spring force is applied in the axial direction. The needle rotating shaft 4 has an axial hole 4a formed in its distal end surface, and is fitted into the distal end of the column 2 so as to be slidable in the axial direction. The bottom surface 4b of the hole 4a and the upper end surface 2a of the column 2 come into contact with the needle rotating shaft 4, so that movement of the needle rotating shaft in the direction of the alarm setting pin 3 is restricted. A ratchet cam 4c is provided on the distal end surface of the needle rotating shaft 4, and meshes with a ratchet cam 3c of the alarm setting pinion 3. A needle turning pinion 4d is formed on the outer peripheral surface of the tip of the needle turning shaft 4. The middle part of the needle rotation shaft 4 is supported by a bearing part 5a of the middle plate 5, and the upper end passes through the upper plate 6, and a needle rotation knob 8, which also serves as an alarm setting, is fixed to the upper end of the needle rotation shaft 4, which protrudes from the outer case 7. There is. An alarm transmission wheel 9 meshes with the alarm setting pinion 3, and the alarm transmission wheel 9 passes through a through hole 1b formed in the lower plate 1 and is rotatably supported. At a position where the needle driving shaft 4 slides upward and the needle driving pinion 4d comes into contact with the lower surface of the bearing portion 5a, the needle driving pinion can be engaged with the minute wheel 10.

With this configuration, the position shown by the solid line in FIG. 1 is the state in which the needle drive shaft 4 is pushed in, and the bottom surface 4b of the hole 4a is in contact with the top surface 2a of the column 2, and its downward movement is restricted. There is. In this state, the alarm setting pinion 3 can be moved in the axial direction by the spring force of the spring pieces 3d to 3f. Then, when the needle turning knob 8 is rotated in the forward direction, that is, in the direction of arrow a in FIG. Alarm settings are made by rotating it. When the needle turning knob 8 is rotated in the opposite direction, that is, in the direction of arrow b in Fig. 4,
Ratchet cam 3c on the back side of ratchet cam 4c.
However, by setting a large frictional load between the alarm transmission wheel 9 that engages with the alarm setting pinion 3 and the support plate 1, the alarm setting pinion 3 is rotated. It is not possible to transmit enough force from the needle rotating shaft 4 to do so. For this reason, a force in the direction of arrow c is applied to the alarm setting pinion 3 so as to separate it from the needle rotation shaft 4, and the alarm setting pinion 3 moves downward against the spring force of the spring pieces 3d to 3f. For this purpose, the ratchet cam 3c,
4c is disengaged, rotation in the opposite direction is not transmitted from the needle rotation shaft 4 to the alarm setting pinion 3. When adjusting the pointer, pull up the needle rotation knob 8 and move the needle rotation shaft 4 to the position shown by the chain line in FIG.
is engaged with the hour wheel 10, so the needle turning knob 8
By rotating in a predetermined direction, the sun wheel 1
By rotating 0, you can advance or delay the pointer.

(Effects of the invention) Since the present invention has the above configuration, the alarm setting pin and the spring piece are integrated, and the number of parts can be reduced. The alarm setting pinion and needle rotating shaft fit into the pillars set up on the support plate and have a concentric structure, making the overall structure compact and easy to manufacture and assemble, which is extremely effective in reducing costs. .

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1 is a sectional view of the main parts, Fig. 2 is a plan view of the alarm setting pin, Fig. 3 is a sectional view taken along the line of Fig. 2, and Fig. 4 is a cross-sectional view of the main part. FIG. 3 is a developed cross-sectional view showing the meshing of the ratchet cams. DESCRIPTION OF SYMBOLS 1...Support plate, 2...Column, 2a...Top end surface of column, 3...Alarm setting pin, 3c, 4c...Ratchet cam, 3d, 3e, 3f...Spring piece, 4
...Needle rotating shaft, 4a...hole, 4b...bottom of hole,
4d...Needle turning kana.

Claims (1)

[Scope of Claim for Utility Model Registration] An alarm setting pinion is rotatably fitted into a pillar installed on a support plate, and the alarm setting pinion has a ratchet cam at its upper part, and a spring force applied to the outer periphery of the lower part in the axial direction. A spring piece is integrally formed to bias the needle drive shaft, and a hole is drilled in the axial direction on the tip surface of the needle drive shaft, and this hole is fitted to the tip of the pillar to rotate the needle drive shaft in the axial direction. The needle rotating shaft has a ratchet cam on its distal end surface that engages with the ratchet cam, and
A needle rotation pinion is provided on the outer peripheral surface, and movement of the needle rotation pin in the direction of the alarm setting pinion is restricted by contact between the bottom surface of the hole and the upper end surface of the column. An alarm setting mechanism characterized by: