JPS5837014Y2 - External operation parts for watches - Google Patents

Description

[Detailed description of the invention] The present invention is a joint for an external operating member for a watch consisting of three parts, which allows the center of the external operating member placed on the outer periphery of the watch case to be set at any position in the thickness direction of the case. This concerns the intermediate shaft.

FIG. 1 shows an external operating member consisting of three parts that allows the thickness direction position 4 of an external operating member 3 attached to the outer periphery of an exterior case 2 to be set regardless of the external operating member center position 1 of the clock movement mounted on the tower. An example of usage is shown.

In FIG. 1, the pushing, pulling, and rotating motions of the first shaft 3 to which the crown 5 is attached are transmitted to the second shaft 7 via the joint intermediate shaft 6, which has joint portions at both ends. , the movement is operated.

2 and 3 show the operation of the external operating member consisting of three members. One end of the first shaft 3 has a cut-in portion 9 parallel to the axis 8 of the shaft, and a cut-out portion 9 perpendicular to the axis, and the interrupt section 9
It has a joint part consisting of a joint retaining hole 10 parallel to the second
A joint portion having the same shape as the shaft 3 is also formed at one end of the shaft 7.

A joint intermediate shaft 6 is disposed between the two shafts 3 and 7 and is engaged with the joint portion of the first shaft 3 and the second shaft 7.
The joint retaining hole 1 of the first shaft 3 is opened by the rotation of the first shaft 3.
0 and the joint retaining hole 10a of the second shaft 7.
The rotation is transmitted to the second shaft 7 while moving in the direction of 11a.

Figure 4 shows the joint intermediate shaft of the present invention, and the first slope 12 functions as a guide when assembling the shaft 3 (see Figure 3) by strongly pressing it in the axial direction, and also functions as a guide for movement operation. A shape suitable for transmitting the pushing motion of the shaft 3 to the shaft 7 (see FIG. 3) is provided.

The maximum middle part 13 has a width such that it can withstand a force of 3 kg when the shaft 3 is pulled, and does not come off.
The length 14 of 3 is such that the shaft 3 does not cause excessive looseness during pushing and pulling operations, and also prevents the joint retaining hole 10 from forming during rotating operations.
, 10 a (see Figures 2 and 3).

The second slope 15 provides a shape suitable for transmitting the pulling motion of the shaft 3 to the shaft 7, but for reasons described later, the second slope 15
It is formed at almost the same angle as the slope 12 of.

On the opposite side of the collar portion 16, a structure 12 of the joint portion is provided.
, 13, 14 and 15 are made to face each other with a phase difference of 90°.

This can be easily understood by referring to FIGS. 5 and 6.

Conventional joint intermediate shafts have been made using a rotary station machine or the like through the steps shown in FIGS. 7 to 11.

To explain this according to the drawings, Fig. 7 shows a material 18, which has been sized in advance to the total length 17a of the joint intermediate shaft (also not referred to in Fig. 5), to the three-split chuck 1 of the first spindle.
9 is fixed, and a first milling 21 (portion shown by a thick line) is performed using a first full-form carter 20.

Next, the first spindle with the raw material 18 fixed thereon moves to the second station, and second milling 21a (the part shown by the thick line) is performed on the opposite side of the first milling 21 by the second general cutter 22.

(See Fig. 8 for the above) When the second milling is finished, move to the third station, open the three-split chuck 19 as shown in Fig. 9, and remove the raw material 18a, which has a joint part formed on one side, from the ejector. It is pushed out by the bottle 23.

The spindle then moves to the fourth station and the first
, the raw materials 18 are aligned in advance so that the finished portions of the second milling rings 21 and 21a can be fixed.
Chuck a again and move to the 5th station.

Then, the third milling 2 is performed by the third general cutter 24.
5 (portion shown by thick lines), and then the machine moves to the sixth station, where fourth milling 25a is performed by the fourth overall cutter 26, and all machining is completed.

(See Figures 10 and 11 for the above) The accuracy of this series of milling processes is closely related to the smooth operation of the external operating members when operating the movement, so it must be performed with as much precision as possible. .

However, in reality, there are various error factors that are unavoidable in processing, such as the accuracy of the cutter used and the accuracy of inches.

Errors caused by the precision of the cutter used are shown in Figure 7~
Four full-form cutters 20°22.24. shown in FIG.
The problem is that the shape error when 26 was manufactured remains as a processing error in the joint part.

In particular, the first cutter 20, the second cutter 22, and
The third cutter 24 and the fourth cutter 26 are each paired to form the shape of the joint part, and only when the shapes of the cutters combined in the pair are exactly the same, the first milling 2
Although the shapes of the first milling ring 21 and the second milling 21a and the third milling 25 and the fourth milling 25a are symmetrical, such a situation cannot be expected in reality.

For this reason, a slight shape error always exists in the parts important for ensuring smooth operation, such as the maximum middle part 13 and the maximum middle part length 14 (see FIG. 4).

Furthermore, variations due to index accuracy occur during re-chucking performed between the second milling and the third milling.

When re-chucking, the raw material 18a is moved to the milled part 21.21a by the guide 27 shown in FIG. 12 (the guide is provided deep in the hole of the three-piece chuck 19).
However, the maximum middle part 13 and the guide width 13a
This requires a slight clearance, and an index error with the maximum value of θ occurs.

Therefore, an external operating member with the worst combination of these variations will not operate smoothly or will have excessive backlash, which will significantly impede the operability of the movement.

Poor machining accuracy of the joint intermediate shaft is thus harmful, and it is clear that the cause of this is the use of four cutters that have minute mutual errors, and the re-chucking that always causes errors. It is.

Therefore, in this invention, we replaced the conventional rotary station machine used to manufacture the joint intermediate shaft with a single-spindle automatic lathe with a moving main shaft, and in order to be able to perform all milling with a single general cutter,
As shown in FIG. 4, the first slope 12 and the second slope 15 have substantially the same shape.

Next, processing of the joint intermediate shaft of the present invention will be explained according to the drawings.

In FIG. 13, the material 28 is guided by a guide bushing 30 lined with a cemented carbide liner 29 and cut into a first cutter by a single general cutter 32 located immediately adjacent to an opening 31 in the bushing. Milling 33 (portion shown by thick lines) is performed, and after retracting the general cutter 32, the main shaft (not shown) that chucked the material 28 is accurately indexed by 180° by an indexing mechanism (not shown). Then, the general cutter moves forward again to perform the second milling 33a (portion shown by thick lines) shown in FIG.

After retracting the general cutter 32, the headstock (not shown) is moved by the required length 34 as shown in FIG.
As the material 28 is delivered, an indexing mechanism (not shown) provides accurate 90° indexing.

Next, the profile cutter 32 is advanced to perform a third milling 35 (portion shown in thick line), and after the profile cutter is retreated, the material 28 is removed by an indexing mechanism (not shown).
In this way, an accurate 180° inch is carried out, and the general cutter 32 moves forward again to carry out the fourth milling 35a (the part indicated by the thick line) shown in FIG.

When all milling is completed, the forming cutter retreats, and the spindle (not shown) is rotated for turning by a spindle rotation mechanism (not shown), and the required length 36
move only.

Next, the cut-off bit 37 moves forward, performs a cut-off 38 (portion shown by a thick line), cuts off the joint intermediate shaft 39 from the material 28, and completes the machining.

The material for a single-spindle automatic lathe is usually 2 m long, and even after the cut-off process is completed, the series of processes described above is automatically repeated to efficiently manufacture a joint intermediate shaft with extremely small processing errors.

As described above, by designing the first slope and the second slope of the joint intermediate shaft to have almost the same angle, it is possible to perform milling using only one full-form cutter, eliminate variations due to cutter manufacturing errors, and Continuous machining without re-chucking is performed using a single-spindle automatic lathe with a moving spindle, which is preferred by watch parts manufacturers due to its high accuracy. Indexing errors are kept to a minimum, resulting in smooth operation of the three-piece external operating member for watches. It has the effect of ensuring operation and improving the operability of the movement.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a timepiece that uses a three-piece external operating member for a timepiece. FIGS. 2 and 3 are detailed views of the operation of the three external operating members for a timepiece. 4, 5, and 6 are side, top, and front views of the joint intermediate shaft of the present invention. FIG. 7, FIG. 8, FIG. 9, FIG. 10, and FIG. 11 are detailed explanatory views of a method of processing a joint intermediate shaft using a rotary station machine. FIG. 12 is a diagram illustrating the causes of index errors during re-chucking. 13, 14, 15, 16, and 17 are detailed explanatory diagrams of machining the joint intermediate shaft of the present invention using a main-spindle moving type single-spindle automatic lathe. 1...The center position of the external operating member of the movement,
2...Exterior case, 3...First axis of the external operating member consisting of three bodies, 4...Thickness direction of the first axis of the external operating member consisting of three bodies position, 5...
・Crown, 6...Coupling intermediate shaft, 7...
・Second axis of external operation member consisting of three parts, 8...
Center of first axis, 9...Interruption part of first axis, 1
0,10 a...Joint engagement hole, 11,11 a
...Moving direction of joint intermediate shaft, 12...
First slope, 13... Maximum middle part, 13a...
... Width of guide, 14 ... Maximum medium length, 1
5...Second slope, 16...Brim portion,
17,17 a...Total length, 18...
Sized raw material, 18 a... Raw material for which the first and second milling has been completed, 19... Three-piece chuck, 20... First general cutter , 21...
...First milling part, 21a...Second
milling part, 22... second general cutter, 23... ejector bin, 24...
...Third general cutter, 25... Third milling member, 25 a... Fourth milling part, 26... Fourth general cutter, 27...
... Guide, 28 ... Material (2m material), 29
...Cemented carbide liner, 30...Guide bush, 31...Opening, 32...
General cutter, 33a...Second milling part, 34.36...Feeding length, 35...
...Third milling part, 37... Cutting off bite, 38... Cutting off part, 39...
...Joint intermediate axis after machining, θ... Maximum index error when re-chucking.

Claims (1)

[Scope of utility model registration request] Forming a retaining portion with another member that is slidable only in the cross-sectional direction with respect to one longitudinal end of the shaft, and another member that is slidable only in the cross-sectional direction at the other end with a phase angle of 90° with respect to the cross-sectional direction. An external operating member for a timepiece, comprising an operating shaft formed of at least three members, by forming a retaining portion with the end retaining portion, and providing an operating shaft that engages with each of the end retaining portions.