JPH084177Y2 - Multi-layer coil spring forming device - Google Patents

Description

Description: TECHNICAL FIELD The present application relates to a forming apparatus for a multilayer spiral spring, and in particular, it is possible to prevent troubles when winding a material from a first roll to a second roll when winding a material using a core rod. It concerns a device that prevents it from happening.

2. Description of the Related Art Conventionally, the method of making a multilayer coil spring shown in FIG. 8 is to wind a material around a core rod and to wind the inner winding part of the multilayer coil spring in a row to make a first coil a, and then to In this case, the outer winding portion of the multi-layer spiral spring is wound in a line to wind the second winding rod. That is, as shown in FIGS. 3 to 7, for example, a wire feeding device is forcibly fed from a quill by using a material feeding device of a type in which a material is fed using a feed roller, and the tip of the quill is used to push the tip of the wire rod. The wire rod is bent into a U-shape by a known bending tool (not shown), and then the wire rod is further fed to a forming position as shown in FIG. 3 by using a feed roller, and then the core rod 1 and the presser foot 2 are moved as shown in FIG. The pin 3 provided on the core rod 1 is fitted into the U-shape formed at the tip of the material by advancing to the molding position and the core rod 1 is rotated, and subsequently, the core rod 1 is rotating and a little for the winding pitch. Each time the core rod 1 and the presser foot 2 move in the winding direction at the same time, the inner winding portion of the multi-layer winding spring is wound in one row as shown in FIG. 5 (making the first winding a), and the final winding of the first row is made. When you finish winding up When the presser foot 2 stops moving and only the core rod 1 is rotated, the side surface of the wire comes into contact with the rotary ring 4 provided rotatably at the tip of the presser foot 2 as shown in FIG. After making the transition part (c) from the first winding (a) to the second winding (b), the first winding start of the outer winding part of the multi-layer winding spring is piled up and wound thereon, and then the core rod 1 is rotated. However, the core rod 1 and the presser foot 2 are slightly moved in the opposite direction to the inner winding portion by the winding pitch to wind the outer winding portion of the multi-layer winding spring in a line as shown in FIG. 7 (second winding roll). Is created).

Problems to be Solved by the Invention When the multilayer coil spring shown in FIG.
Problems often occurred in the stacking process shown in FIG. That is, when the material is wound by the core rod 1, when the final winding of the inner winding portion of the multi-layer winding spring is rolled up (especially when the transitional portion C is formed), the presser foot 2 is pushed in the winding direction by the winding force, Due to the rotation of the core rod 1 and its pressing force, it is difficult for the material to enter between the core rod 1 and the presser foot 2 and the stacking may not be performed smoothly.

Embodiment FIG. 1 and FIG. 2 are views for explaining the structure of an embodiment of the present application. A core rod (12) is fixed to a holder (10) that can be rotated and moved back and forth by power from a drive source. The core rod 12 has a diameter in consideration of the spring back in the diameter of the multilayer winding spring to be manufactured, and a pin 14 for hooking the material is provided in the central vertical direction. On the other hand, a case 16 that moves back and forth in the direction of the holder 10 in synchronization with the holder 10 is provided, and a guide path 18 is provided in the holder 16 side of the case 16 in the vertical direction.
A fixed block 22 having a U-shape is attached to the slide 20 guided by. Reference numeral 23 is a lid for holding the slide 20 in the guide path 18. One side of the slide 20 is always pushed upward by a spring 25, one side of which is held by a spring receiver 24, and one side of the slide 20 is determined by contacting a stopper 27 provided on a stop holder 26 provided on the case 16. The lower part of the U-shaped fixed block 22 is a fork-shaped bifurcated shape 29 that matches the engaging groove 28 provided on the core rod 12, and the upper part of the fixed block 22 is rotatably supported by a rotating disk 30. It is supported and provided by the pin 32. Further, the distance between the rotating disk 30 and the bifurcated shape 29 is the same as the distance from the engaging groove 28 of the core rod 12 to the length of the tip end portion.

Action Now, a processing procedure for manufacturing the multilayer coil spring shown in FIG. 8 by using the device of the present invention will be described. First, a feed roller of a material feeding device is used to feed a wire rod whose tip is bent into a U-shape at its tip portion to a processing position for wire processing.
Then, as shown in FIG. 9, the core rod 12 fixed to the holder 10 moves forward with respect to the sent wire rod and the U
Move forward to the position where the letter-shaped part engages the pin 14
10 stops. At this time, as shown in FIG.
Alternatively, depending on the required shape of the tip of the wire rod, another engaging structure may be used, such as providing the through hole 15 in the core rod 12 and engaging the tip of the wire rod with the through hole 15. Then the tenth
As shown in FIG. 11 and FIG. 11, the case 16 to which the fixed block 22 is attached advances from the side, and the portion of the bifurcated shape 29 matches the engaging groove 28 of the core rod 12. At this time, the rotating disk 30 is in contact with the tip of the core rod 12 without any clearance. After that, the core rod 12 starts to rotate, the pin 14 engages with the U-shape at the tip of the wire rod, and further rotates to pull the wire rod from the quill and hold the holder 10.
, Each time the core rod 12 makes one rotation, the pitch is moved downward by one pitch as shown in FIG. 12 to sequentially wind the inner winding portion of the multilayer winding spring in a line. At this time, the slide 20 for fixing the core rod 12 moves downward along the guide path 18 against the spring 25. When the wire rod has finished winding up to the upper end position of the core rod 12, the slide 20 stops descending, and at that position the wire rod is piled up and wound on the inner wire rod, and at that time, the rotating plate 30 contacting the side surface of the wire rod together with the wire rod. By rotating with it, the stacking is done smoothly. Thereafter, as shown in FIG. 13, the core rod 12 further rotates, and each time the holder 10 makes one rotation of the core rod, the pitch shifts upward by one pitch, which is the outer side of the multilayer coil spring. Wind a certain amount of the winding part in a row,
When the winding is completed, the cutting tool cuts the wire on the front side of the quill by a known method.

Effect When a multi-layer winding spring is formed by the device of the present application, since the rotary disk 30 is held by using the U-shaped fixed block, the first winding having the inner winding wound in a row and the outer winding having a single row are wound. It is possible to smoothly create the overlapping part of the transition part that moves to the second volume, which does not involve biting. Therefore, continuous production of the multilayer spiral spring is continuously performed without any trouble, and the work efficiency in the production of the multilayer spiral spring is improved. Furthermore, since the rotating disc 30, fixed block 22, etc. are retracted from the tip of the core rod 12 except when the wire rod is wound around the core rod 12, it is possible to perform foot bending processing after winding processing and product discharging process. There is also an advantage that does not hinder its operation.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIGS.
FIG. 8 is an illustrative view of a multi-layer spiral spring, FIGS. 9 to 13 are explanatory views of a working process according to an embodiment of the present invention, and FIG. 14 is a view showing another embodiment of an engaging structure. 10 …… Holder 12 …… Core rod 14 …… Pin 20 …… Slide 22 …… Fixed block 30 …… Rotating disk

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. In a machine for forming a multi-layer spiral spring, a core rod around which a material is wound, an engaging structure for hooking a material having a bent portion formed at a tip end portion provided on the core rod, and an engagement provided on the core rod. The groove, the fixed block that fixes the core rod in the front-rear direction between the engaging groove and one end of the core rod, and the wall surface on which the material being wound around the core rod contacts one surface of the fixed block. It is composed of a rotating disc that can be freely rotated, and it is possible to wrap the material around the core rod and rotate the rotating disc with the material when transferring the material from the inner winding part to the outer winding part. An apparatus for forming a multi-layer spiral spring, characterized in that