JPH0228589A - Mechanical body for timepiece - Google Patents

Abstract

PURPOSE:To automate and speed up connection and to improve the reliability of connection by providing hole parts into which electrode rods for spot welding can be inserted to an upper plate and a lower plate so as to face each other. CONSTITUTION:Constituting element groups such as a battery contact piece 6, a lead frame 4 and timepiece wheel train are first assembled to the lower plate 2 and the upper plate 1 is connected to the lower plate 2 at the time of assembling the machine body. Since connecting ends 4b, 6b are superposed in the state of pressing the tips of respective cylindrical parts 1b, 2b to said ends opposite to the hole parts 1a, 2a of the upper plate 2 and the lower plate 3, the positions of the connecting ends 4b, 6b are maintained in the state of connecting the upper plate 1 and the lower plate 2. The connecting ends 4b, 6b can be instantaneously spot welded by inserting the electrode rods 10, 11 from the hole parts 1a, 2a in the final stage of assembly. The cylindrical parts 1b, 2b shut off the inside and outside of the machine part and, therefore, the infiltration of a welding gas into the machine body is obviated at the time of welding. The connection is automated and speeded up and the reliability of the welding is improved in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a timepiece machine body comprising a plurality of conductor pieces to be interconnected.

(Prior art) In the conventional technology, for example, the connection between a battery contact piece and a predetermined circuit pattern on a circuit board is achieved by providing a groove in the battery contact piece, sandwiching the circuit board between the grooves, and making elastic contact with the circuit pattern on the board. This is accomplished by bending the battery contact piece, providing a spring part and press-fitting it into a groove provided in the watch case to bring it into elastic contact with the circuit pattern, or by soldering both.

(Problems to be Solved by the Invention) In the first conventional technique, the contact becomes unstable due to the cutting of the circuit board, and precision of the parts on the contacting side is required. Further, in the second type, the pressing force becomes insufficient over time due to creep in the spring portion, and the contact becomes unstable. Therefore, in order to maintain the contact force, tightening with screws may be required, and in this case, the number of parts increases. Furthermore, the third type has high conductivity reliability and stability, but has problems such as a long assembly cycle time because it takes time for the solder to solidify.

An object of the present invention is to automate and speed up the connection, and at the same time improve the reliability of the connection.

(Means for Solving the Problems) In the watch mechanical body according to the present invention, the upper plate and the lower plate are provided oppositely with holes into which electrode rods for spot welding can be inserted, and two conductor A piece is characterized in that a part thereof is provided so as to overlap in a plane at a position facing both holes, and both conductor pieces are spot welded by an electrode rod inserted from both holes. It is.

(Function) Parts of the two conductor pieces overlap and face the holes in the upper and lower plates of the watch, so by inserting an electrode rod through these holes and spot welding, electrical Moreover, the mechanical connection can be made instantaneously and reliably.

(Embodiment) As shown in FIG. 1, a group of components 3, such as a watch wheel train, is housed between an upper plate 1 and a lower plate 2. A lead frame 4 formed of a thin metal plate is provided on one side (lower side) of the lower plate 2.
is arranged and forms part of the drive circuit unit. A battery storage section 5 is provided on the other side (right side) of the lower plate 2, and a positive battery contact section 4a extending from the lead frame 4 is provided at one end (lower end) of the battery storage section 5. is arranged. At the other end (upper end) of the battery storage section 5, one end 6a of a negative battery contact piece 6 is disposed.

The other end of the battery contact piece 6 is bent and stretched into an L-shape and consists of the lead frame 4 and a connecting end 6b made of a conductor piece. As shown in the third diagram, the lead frame 4 is provided with a connection end 4b formed by layering one conductor piece.
b and 6b overlap in a plane.

On the other hand, the upper plate 1 and the lower plate 2 have holes 1a as shown in FIG.
, 2a are provided in a protruding manner to face each other. Then, the connecting end 4b is sandwiched between the tips of the cylindrical parts 1b and 2b at positions facing the holes 1b and 2b, respectively.
and 6b overlap. A coil bobbin 7 of a drive coil (not shown) is attached to the lead frame 4, and an integrated circuit 8. Circuit elements such as a crystal oscillator 9 are connected.

When assembling the watch mechanism, first attach the battery contacts 6 to the lower plate 2. A lead frame 42 is assembled with the component group 3 such as a clock train, and the upper plate 1 is connected to the lower plate 2. Connecting end portion 4b, with the tips of cylindrical portions 1b and 2b in contact with holes 1a and 2a of upper plate 1 and lower plate 2, respectively;
6b overlap, the positions of the connecting ends 4b and 6b are maintained in a state where the upper plate 1 and the lower plate 2 are connected. Therefore, in the final step of assembly, the electrode rods 10.11 are inserted through the holes 1a, 2a, and the connecting ends 4b are inserted.

6b can be spot welded, instantly connecting end 4
b and 6b are stably connected, and assembly can be automated easily.

Further, the cylindrical portion 1b that is in contact with the connection terminals 4b and 6b,
2b isolates the inside of the watch machine from the outside, so that welding gas generated during welding does not enter the watch machine. Therefore, it contributes to stabilization of quality and also has excellent dust resistance after assembly.

Note that the conductor piece is not limited to lead frames and battery contact pieces, but can also be applied to alarm springs and the like.

(Effects of the Invention) The present invention has the above-described configuration, and the two conductor pieces to be connected are partially overlapped at positions facing the holes provided in the upper plate and the lower plate. It is possible to spot weld both conductor pieces during the final assembly of the machine body. Furthermore, automation of the connection becomes easy, and the connection between both conductor pieces becomes fast, reliable, and highly reliable. Further, since a cylindrical portion is provided around the hole, and the tip end surface of this cylindrical portion is in contact with a part of the conductor piece, excellent dustproof properties can be obtained.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a partially cutaway plan view, Fig. 2 is an enlarged sectional view taken along the line n-tt of Fig. 1, and Fig. 3 shows one conductor piece. FIG. 3 is an enlarged front view of the lead frame. 1. Upper plate, 2. Lower plate, la, 2a... Hole portion, lb, 2b... Cylindrical portion, 4b, 6b... Conductor piece, 10.11... Electrode rod. Applicant Seikosha Co., Ltd.

Claims (2)

[Claims] (1) Holes into which electrode rods can be inserted are provided oppositely in the upper and lower plates, and parts of the two conductor pieces are provided so as to overlap two-dimensionally at positions facing both the holes. A timepiece machine body, wherein both of the conductor pieces are spot-welded by electrode rods inserted from both of the holes. (2) In claim 1, the two holes are bored in a cylindrical part integrally formed with the upper plate and the lower plate, and the tip of each cylindrical part is A timepiece mechanical body, characterized in that a surface is in contact with the part of the conductor piece.