JPS6277123A - Spiral spring production - Google Patents

Abstract

PURPOSE:To form the inner diameter of the front end part of an elastic material in the optimum small diameter by winding the elastic material with the winding shaft at the outer side by rotating the outer side winding shaft at the same speed as that of the inner side winding shaft, after rotating the inner side winding shaft which locks the front end of the elastic material more than one time under the non-rotation state of the outer side winding shaft. CONSTITUTION:The front end of an annealed elastic material 5 is locked to the locking groove 3 of the inner side winding shaft 2 via the opening part 8 of the outer side winding shaft 7. Thereafter the elastic material 5 is wound by the winding shaft 2 by rotating it only with the winding shaft 7 being made in non-rotating state. After rotating the winding shaft 2 more than one rotate the elastic material 5 is wound with the winding shaft 7 by rotating the winding shaft 7 in the same direction and at the same speed as those of the winding shaft 2. In case of this winding by the winding shaft 7, the spring back of the front end part of the elastic material 5 is blocked by the inner peripheral face of the side wall of the winding shaft 7. The front end part 5'a of the spiral 5' produced with this method becomes of the optimum small diameter centering around the front end.

Description

[Detailed description of the invention] (1) Industrial application field This invention relates to a method for manufacturing a mainspring.

(2) Prior art As shown in Fig. 4, the conventional mainspring manufacturing method involves locking a winding shaft 2 that is vertically disposed in a workbench (not shown) and has its tip protruding from the surface of the table l. The blunt front end of a flat elastic material 5 having a desired length, width, and thickness was locked to the 'ls 3, and the winding shaft 2 was rotated to wind up 58 pieces of elastic material on the winding shaft 2. .

(3) Problems to be Solved by the Invention By the way, in the case of the manufacturing method using the l-shaft as described above, the spring 5' of the elastic material 5 causes the mainspring 5' to be
As shown in FIG. 5, the diameter of the front end 5'a of the front end 5'a becomes large with the front end as the center, and it is very difficult to form the front end 5'a of the same diameter into an appropriate small diameter.

Therefore, after manufacturing and before making the final product, the front end 5'
It is necessary to manually correct the diameter so that it becomes a small diameter, or it is necessary to lengthen the blunt to the front end 5a so that the diameter becomes as small as possible, which increases the number of work steps and reduces work efficiency. there were.

Therefore, the technical object of the present invention is to make it possible to form the inner diameter of the front end portion of the elastic material into an appropriate small diameter in one work step.

(4) Means for Solving the Problems In order to solve the above-mentioned problems, the mainspring manufacturing method of the present invention includes a locking portion that locks the front end of a flat elastic material having a desired length, width, and thickness. , has an inner winding shaft arranged rotatably, and an opening for inserting the elastic material in the side wall, and is arranged rotatably with an annular gap formed on the outside of the inner winding shaft. After rotating the inner winding shaft, which has a cylindrical outer winding shaft and the front end of the elastic material is locked at the locking part, for one or more revolutions with the outer winding shaft not rotating, the outer winding shaft is attached to the inner winding shaft. The elastic material is rotated in the same direction and at the same speed, and the elastic material is wound on the outer winding shaft.

(5) Embodiment FIG. 1 shows an embodiment of the present invention. In this embodiment, the same parts as in the conventional one are given the same reference numerals and explanations are omitted, and different parts will be mainly explained. That's it.

Reference numeral 7 denotes a cylindrical winding shaft that is rotatably disposed with an annular gap formed on the outside of the winding shaft 2, and an elastic material 5 is attached to the side wall of the winding shaft 7.
An opening 8 is bored through which the holder is inserted. Inwardly tapered surfaces 9 are formed on both sides of the opening 8 and can guide the elastic material 5 wound around the winding shaft 7 without damaging it. Winding shaft 7
is arranged slightly eccentrically with respect to the winding shaft 2, but it may be arranged concentrically. Furthermore, although the planar shape of the side wall of the winding shaft 7 is approximately oval, it may be circular. and,
Like the winding shaft 2, the winding shaft 7 is connected to a drive mechanism provided in the workbench, and can be rotated by the drive mechanism in synchronization with the winding shaft 2 or separately, and the direction of rotation and The rotation speed is the same as that of the winding shaft 2.

Next, manufacturing of the mainspring will be explained with reference to FIG.

First, the blunted front end of the elastic material 5 is locked in the locking groove 3 of the winding shaft 2 through the opening 8 of the winding shaft 7 (A). After that, the winding shaft 7
is in a non-rotating state, only the winding shaft 2 is rotated, and the elastic material 5 is wound up on the winding shaft 2 (B). After the winding shaft 2 rotates once as shown in (C), the winding #17 is then rotated in the same direction and at the same speed as the winding shaft 2, and the elastic material 5 is wound up on the winding shaft 7 (D). This winding shaft 7
During winding, springback of the front end 5a of the elastic material 5 is suppressed by the inner circumferential surface of the side wall of the winding shaft 7. Therefore,
Front end 5' of mainspring 5' manufactured as described above
As shown in FIG. 3, a has an appropriate smaller diameter centered at the front end compared to the conventional one shown in FIG.

In the above description, the winding shaft 2 is rotated once before the winding shaft 7 is rotated, but this may be more than one revolution, such as two revolutions. Further, the embodiment merely shows a preferable example, and it goes without saying that the locking portion of the winding shaft 2 is not limited to the locking groove 3, and other designs having the same effect may be used.

(6) Effects of the Invention This invention is as described above, and has a locking part that locks the front end of a flat elastic material having a desired length, width, and thickness, and is rotatably arranged. The elastic material comprises an inner winding shaft and a cylindrical outer winding shaft which has an opening in the side wall into which the elastic material is inserted and is rotatably disposed with an annular gap formed outside the inner winding shaft. After rotating the inner winding shaft with the front end of the material locked at the locking part for more than one rotation with the outside winding shaft not rotating, the outside winding! 1) is rotated in the same direction and at the same speed as the inner winding shaft, and the elastic material is wound on the outer winding shaft, so that the inner diameter of the elastic material is appropriately formed into a small diameter at the front end of the winding. Can be done,
The molding phase change can be improved and the final product can be shipped as is.

Therefore, it is completely unnecessary to perform manual correction as in the past and to lengthen the front end of the blunt hem, which has the excellent effect of greatly improving work efficiency.

[Brief explanation of drawings]

Fig. 1 is a schematic plan view showing one embodiment of the present invention, Fig. 2 (A) CB) (C) CD) is a schematic plan view showing the same mainspring manufacturing process, and Fig. 3 is a schematic plan view showing the same mainspring manufacturing process. FIG. 4 is a schematic plan view showing a conventional example, and FIG. 5 is a plan view of the mainspring manufactured by the same method.

Claims (1)

[Claims] 1. An inner winding shaft rotatably disposed and having a locking portion that locks the front end of a flat elastic material having a desired length, width, and thickness;
It has an opening in the side wall for inserting the elastic material, and a cylindrical outer winding shaft that is rotatably disposed with an annular gap formed outside the inner winding shaft, and engages the front end of the elastic material. After the inner winding shaft, which is locked at the stop, is rotated one or more revolutions with the outer winding shaft not rotating, the outer winding shaft is rotated in the same direction and at the same speed as the inner winding shaft, and the elastic material is removed by the outer winding shaft. A mainspring manufacturing method characterized by winding a mainspring.