JPS62130731A - Forming device for zigzag spring - Google Patents

Abstract

PURPOSE:To form a fish mouth by only bending a torque bar part, by forming zigzag by driving a supporting and turning device and a bending device by a computer. CONSTITUTION:A motor 30 rotates a screw rod 28, a bending device 16 is moved to the right and left outside ends of a wire lever 8, and they are inserted and held by right and left inserting and holding pieces 19, 19 of a fixed supporting body 18, and a roller 21 and 22 of a bending part 20. Subsequently, the bending part 20 is rotated and the wire lever 8 is bent by 90 deg., and a torque bar part is formed. When the bending part 20 is rotated and the wire lever 8 is bend, subsequently, the motor 30 is conducted electrically, the bending device 16 is moved to the inside and the next inserting and holding part of the wire lever 8 is inserted and held by right and left inserting and holding pieces 9, 9. The motor 23 is conducted electrically again, and by a rotation of the bending part 20, a loop part is formed. In this case, the torque bar part and a loop part become an L type, and subsequently, bent by a rotation of the bending part 20, but before that, a rotating body 9 is rotated by a motor 14, the wire lever 8 is rotated by 45 deg., and that which has twisted the loop part and the torque bar part by 45 deg. is obtained. In this way, a fish mouth is formed.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a zigzag spring forming device.

(Prior Art) A conventional zigzag spring A (see Fig. 1), in which a loop part B and a torque bar part E are continuously formed, has a fish mouth part F formed at the end thereof.

In this known device, a loop portion B near both ends of a zigzag spring A is held between a twist jaw C and a fixed jaw D from both sides,
The structure was obtained by twisting the torque bar part E by rotating the twist jaw C to a predetermined angle about the torque bar part E as an axis.

(Problems to be Solved by the Invention) In the above-mentioned known device, a fish mouth is formed by twisting the torque bar part E, but the amount of springback due to the twisting process is 0 when the bending angle is 1.

Since it varies considerably depending on the length of a portion of the torque bar and the wire diameter d of the zigzag spring A, the springback amount θ had to be experimentally estimated and set each time these changed.

(Means for Solving the Problem) Therefore, the present invention provides a method of forming a fish mouth by simply bending the torque bar part E, instead of a method of twisting the torque bar part E to form a fish mouth. At the upper center position of the frame l placed on the floor,
A support rotation device M3 having a support shaft 6 that supports the center portion of the wire rod 8 cut to a certain length and a rotating body 9 that rotates the wire rod 8 around the axis is provided, and the support rotation device 3 A bending device M16.16 is provided on both sides of the wire rod 8 for simultaneously bending both ends of the wire rod 8 by the predetermined dimensions. The motor 14 that rotates the rotating body 9 of the support rotation device 3, and the bending device! 6
A motor 23 and a moving motor recess of the bending device 16 are provided. The molding equipment is closed.

(Embodiment) To explain one embodiment of the present invention with the drawings, l is a frame, which is formed long in the direction of movement of a bending device 16, 16 to be described later, and is supported on the floor by supporting legs 2, 2 provided at desired positions. will be placed on.

A support rotation device 3 is provided at the upper center of the frame l. The support and rotation device 3 supports and fixes the zigzag spring cutting wire rod 8, and rotates the wire rod 8 in a direction around the axis. Support frames 4.4 having an SN-shaped shape in the longitudinal direction of the frame 1 are fixed on the vertical rods 5 of the frame 1 at predetermined intervals in the longitudinal direction of the frame 1. The support frame 4
, 4, the support shaft 6 is attached so that it can only rotate freely. Support shaft 6
A fitting groove 7 is formed in the length direction on the outer peripheral surface of the fitting groove 7.
The wire rod 8 is fitted from above.

A zero-rotating body 9 for fixing a rotary body 9 perpendicular to the linear rod 8 at a substantially central position of the support shaft 6 is formed in the shape of a disk, and has a fixing groove lO formed in a part of its outer periphery. The center part of the wire rod 8 is formed into an n-type in the left/right direction LP, and is connected to the fixing groove l.
A toothed surface is formed on the outer circumferential surface of the rotary body 9 to be fitted into the rotor 9, an intermediate gear 13 is meshed with the toothed surface, and a drive gear 15 of a motor 14 is meshed with the intermediate gear 13.

The bending device 16 is provided on both left and right sides of the support rotation device 3. Reference numeral 17 denotes an n-type frame extending in the front-rear direction S-N, and a fixed support 18 is provided on the upper surface of the frame 17. Left and right holding pieces 19 and 19 are formed on the upper part of the fixed support body 18 to hold both left and right ends of the wire rod 8.

A bent portion 20 is provided near the outside of the fixed support 18 . A roller 21, n is provided on the upper part of the bending part 20.

The rollers 21.22 have approximately the same height as the left and right gripping pieces 19.19, so that the gap between the rollers 21.22 matches the gap between the left and right gripping pieces 19.19. The rollers 21, 22 rotate horizontally together with the folds.

23 is a motor that horizontally rotates the bending portion 20 together with the rollers 21 and 22, and 24 is a gear box that transmits the rotation of the motor 23.

Reference numeral 5 denotes a moving table on which the frame 17, the bending portion 20, the motor n, and the gear box 24 are placed, and is mounted on a rail 26 provided on the vertical rod 5 of the frame 1. The upper end of a downwardly projecting mounting plate n is fixed to the outer edge of the movable table 25. A threaded rod 28 is screwed into the mounting plate n. The threaded rod 28 is connected within the motor and gear spokes and rotates to move the movable table δ in the left and right direction.

The motor 14, motor 23, and motor Tatsumi are connected to a computer 32 via an interface 31, and the rotations of the motor 14, motor n, and motor (2) are controlled.

33 is a long steel wire or the like which is the raw material of the wire rod 8, and 33 is a zigzag spring, A is a loop part of a zigzag spring U, A is a part of a torque bar, 37 is a fish mouth part, and 38 is a center part.

(effect) Next, we will discuss the effect.

A long steel wire rod, which is a raw material, is cut into a predetermined size T using a cutting device to obtain eight groups of cut wire rods for zigzag springs of a constant length (FIG. 2).

The central bent portion l of the wire rod 8! The rotating body 9 of the supporting rotation device 3
, and the left and right horizontal portions of the central bent portion 11 are fitted into the fitting grooves 7 of the support shaft 6 from above.

In this state, when the main switch is turned on, the motor (9) rotates the threaded rod 28 for a certain period of time, and the bending device 1
6.16 are simultaneously moved to the left and right outer ends of the wire rod 8, and the left and right gripping pieces 19.19 and the roller 2 of the bent portion 4 are fixedly supported and rested.
1 and roller n (Fig. 3).

That is, a is the outer end of the wire rod 8, and b is the bent part.

If C is a clamping part, the rollers 21 and 22 clamp the bent part, and the left and right clamping pieces 19 and 19 clamp the clamping part C (
Figure 4).

In this state, the motor 23 is energized and the bending portion 20 is
Since it is rotated in the 0° direction, the wire rod 8 is bent at 90 degrees from the bending point, forming a part of the torque bar (
Figure 5).

When the bending portion rotates and bends the wire rod 8, the CPU 32
The motor is then energized to rotate the threaded rod and move the bending device 16 inward by a predetermined distance as shown in FIG. Then, the next clamping part C point of the wire rod 8 is clamped by the left and right clamping pieces 9.

In this state, the motor 23 is energized again and the 7th r! 4
Rotate the bent 11B2O by 90'' to form a black loop.

In this case, the loop portion 35 after a portion of the torque bar becomes L-shaped, and then the motor J is energized and the bent portion JI of a predetermined dimension is
Move the LLS inward (figure fJSg) and rotate the bent #B20 in the direction A again using the motor n to bend it. However, before that, the motor 14 is energized to rotate the rotating body 9 and the wire rod 8 is bent. Rotate it about 45 degrees toward the mouth as shown in Figure 8.

As shown in Figure 9, there is a part of the torque bar after the loop part (45
@You get something twisted. Therefore, if these steps are combined and repeated a desired number of times while being controlled by a computer, what is shown in FIG. 11 can be easily obtained and the fish mouth portion U can be formed.

Also, by changing the amount of rotation of the bending portion 20 and the amount of rotation of the wire rod 8 in the direction around the axis.

By changing the length of each torque bar part and the loop part 35, the fish mouth part 4 can be formed into various shapes.

(Effects) As described above, a conventional zigzag spring A (FIG. 12) in which a loop portion B and a torque bar portion E are continuously formed has a fishmouth portion F formed at the end thereof. In this known method, a loop portion B near both ends of a zigzag spring A is held between a twist jaw C and a fixed jaw D, and the twist jaw C is rotated to a predetermined angle around a torque bar portion E as an axis. It had a structure obtained by twisting part E of the torque bar. However, in the known device, the fish mouth is formed by twisting the torque bar part E, but the springback amount θ due to the twisting process is determined by the bending angle α, the length of the torque bar part, and the wire diameter of the zigzag spring A. d-, so the springback amount θ had to be experimentally estimated and set each time these changed.

However, in the present invention, the fish mouth is formed by simply bending the torque bar part E, instead of the method of twisting the torque bar part E to form the fish mouth. A support shaft 6 that supports the center part of a wire rod 8 cut to a certain length is placed at the upper center of the frame l.
and a rotary body 9 for rotating the wire rod 8 around its axis, and a support rotation device 3 having both ends of the wire rod 8 with a predetermined size on both sides of the support rotation device 3. A folding device 116.16 capable of folding is provided, the folding device 16.16
is provided so as to be movable in the length direction of the wire rod, and the support rotating device is provided!
The motor 14 that rotates the rotating body 9 of No. 3, the motor name of the bending device 16, and the bending device! 6 moving motors are provided, and the motor I4 and the motor n are separately connected to a computer via an interface 31 to form a zigzag spring forming device so that a zigzag spring of a desired shape is formed. .

B. Since the known example is formed by twisting the torque bar part E,
The amount of springback θ due to twisting is determined by the bending angle α,
Since it varies considerably depending on the length of a part of the torque bar and the wire diameter d of the zigzag spring A, the springback amount θ had to be experimentally estimated and set each time these changes. Instead of twisting the wire rod 8,
Since it is a simple bending process, there is no need for experimental estimation or setting.

As mentioned above, in the known example, the torque bar part E is twisted and formed, so the strength of the product is low. However, since the present invention is formed by two-dimensional bending, the durability of the zigzag spring is extremely high.

C. By changing the amount of rotation of the bent portion and the amount of rotation of the wire rod 8 in the direction around the axis, fish mouth portions of various shapes can be formed very easily. This effect cannot be expected at all in known examples.

This effect is achieved.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the entire device, FIGS. 2 to 9 are working state diagrams, FIG. 1θ is a block diagram, FIG. U is a perspective view of the zigzag spring of the present application, and FIG. 1st
3A, 3B and 3C are manufacturing drawings of each known example, FIG. 14 is a partial front view of a zigzag spring, and FIG. 15 is a state diagram of springback. Explanation of symbols

Claims (1)

[Claims] At the upper central position of the frame 1 placed on the floor, there is provided a support shaft 6 that supports the center portion of a wire rod 8 cut to a certain length, and a rotating body 9 that rotates the wire rod 8 around its axis. A support rotation device 3 is provided, and bending devices 16, 16 are provided on both sides of the support rotation device 3, which can simultaneously bend both ends of the wire rod 8 by a predetermined size. The rotating body 9 of the support rotation device 3 is provided so as to be movable in the length direction of the wire rod.
A motor 14 for rotating the folding device 14, a motor 23 for the folding device 16, and a movement motor 30 for the folding device 16 are provided, and the motor 14, the motor 23, and the motor 30 are provided.
is a zigzag spring forming device connected to a computer 32 via an interface 31 so that a zigzag spring of a desired shape is formed.