JPS6352724A - Method and device for forming spring - Google Patents

Abstract

PURPOSE:To enable a complicated bending by one piece of a tool by making a piece of a forming tool rotatable around a quill shaft line and rotatable within the face including the quill shaft center at the forming position of the quill front face and the retreating position. CONSTITUTION:the coil part, the circular arc of a hook, bending part, etc., are formed by abutting the wire rod fed out of a quill 12 via a feeding out roller 14 and pressing roller 15 to the forming tool fitted to the tip of a forming device 40. The forming tool fitted to the forming device 40 is rotatable with the axial line of the quill 12 as the center and rotatable within the face including the axial line of the quill 12 to the forming position and retreating position of the quill 12 front face. The wire rod fed out of the quill 12 is subjected to various complicated bendings based on the command of the NC device by the forming tool advanced to the quill front face from the bend part B of a 1st hook to a linear part C, bend part D, linear part E and coil body part, and after the forming the wire rod is cut by the cutting tool CT advanced to the front face of the quill 12.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a spring forming method and apparatus for forming a coil portion, an arc of a hook, or a bent portion by colliding a fed wire rod with a forming tool.

BACKGROUND ART Conventionally, this type of spring molding involves, for example, a circular arc portion of a first hook portion in molding a torsion coil spring.

The bending part from the first hook part to the coil part, the body part of the coil, and further the rising part of the second hook part.

The shaping of the arcuate portion of the second hook portion, etc. has been carried out separately using a plurality of shaping tools arranged radially so as to be movable forward and backward.

Problems to be Solved by the Invention For this reason, a large number of forming tools are required, each having a unit structure, which increases the price, and the mounting of the front plate is restricted by the position and the number of wood is controlled, making it complicated. There were problems in that molding could not be performed in some cases and the mechanism became complicated.

Another way to solve the problem is to bend the wire in multiple directions using a single tool by rotating the forming surface Ta of one forming tool T that abuts the wire being sent out so that it faces the bending direction of the wire. It's a method. Further, the forming tool T is provided so as to be rotatably positioned around the axis of the quill 12 and within a plane including the axis of the quill 12, and the first drive means 5.57. 53 and 51, and a second driving means 4 for rotating the quill 12 in a plane including the axis thereof.
, 68, 69° 70 are provided, and the first driving means and the second driving means are associated with each other so that they act in the same order on the wire bending.

Embodiments of the present invention will be described below based on the drawings.

Embodiment 1 In FIGS. 1 to 9, a frame 2 and a box frame 3 behind it are provided for mounting tools on the machine stand 1, and a frame 2 is provided for mounting tools.
A large gear 5 for rotating the forming tool and a large gear 4 for rotating the cam that swings the forming tool are each rotatably and concentrically supported. The box frame 3 includes a reducer 6 that rotates the large gear 4, a servo motor 7 that drives it, a reducer 8 that rotates the large gear 5, a servo motor 9 that drives it, and a reducer 10 that rotates the delivery roller. A servo motor 11 is built in to drive it. These servo motors are controlled by an NC control device (not shown).

The tool is attached to the front of the frame 2 with a quill 12 whose tip is positioned on the center line of the large gear 4.5 and which guides the wire rod.
3, and a feed roller 14 is disposed at a position below the quill center line on the rear side, and a press roller 15 is disposed at a position above the quill center line. Feeding roller 1
4 has a groove on its circumference, and is rotatably supported on a base 13 and rotated by a servo motor II with a speed reducer 0. The holding roller 15 is rotatably supported on a block that is vertically movably supported on the base 13, and is mounted on the base 13.
The feed roller 14 is pressed against the feed roller 14 by a spring 17 interposed between the spring support 1G and a spring receiver 1G provided so as to be able to adjust the amount of compression. The wire wound around the hoop is then held between upper and lower rollers and sent out from the quill 12.

Further, a cutting device 2o for cutting the wire fed from the quill 12 at a required position is attached in a radial direction toward the center of the large gear 4.5. That is, a sliding body 22 is fitted into a guide stand 21 mounted radially toward the center, and a tool holder 23 is provided in a radial groove of this sliding body 22 so that its position in the radial direction can be adjusted. Tool holder 2
A cutting tool CT whose cutting surface matches the surface of the quill 12 is replaceably provided at the inner end of the quill 3 . A cam follower 25 is pivotally supported at the outer end of the sliding body 22, and two spring tension pins 26 are installed.

For mounting the tool, a cam 24 is fixed to the shaft of a small gear which is supported by the frame 2 and meshes with the large gear 5, and this cam 24 is brought into contact with a cam follower 25 of the cutting device 20. A spring 30 is stretched between a pin 26 installed on the sliding body 22 for contacting the cam follower 25 and two wooden pins 29 installed on the front side of the frame 2 for mounting tools.

Further, the forming device 40, which is the key point of the present invention, is installed on the same line as the front quill 12 of the frame 2, so that the tool is attached thereto. The molding device 40 is formed into a unit, and the unit base 41 has a sliding guide surface 41a in the radial direction, and a tool operating table 42 is slidably provided on the sliding guide surface 4-1a. There is.

This tool operation table 42 has a center line aligned with the center line of the quill 12, and a groove 4.5 cut in the diametrical direction at the tip of the quill.
2 is formed, a tool holder 43 is inserted into the groove, and an operating cylinder 45, which is pivoted about the center line 2 by a support shaft 44, is rotatably supported by a bearing. An operating rod 46 is fitted into the center hole 4.5b of the operating tube 45 via a sliding bearing so as to be rotatable and movable in the axial direction. This operating lever 4
The L-shaped layered curved portion 46a at the tip of the quill side of No. 6 and the tool holder 43
are each pivotally connected to the bins 4,8,49 such that their ends are pivotally connected by a connecting plate 47. The other end of the tool holder 43 has a forming tool T replaceably attached to the engagement groove 4.3a. The forming tool T has a forming surface Ta inclined with respect to the axis on the surface facing the quill.

The operating rod 46 has a central part supported by a bracket l-50 attached to the tool operating table 42, and a rear end with a square bar 46C cut out, and a male thread 46b following the square bar 46c. is engraved. A worm gear 51 having a square hole is fitted into the square bar 46c so as to be relatively movable, and the worm gear 51 is rotatably supported by a bearing on a bracket 52 fastened to the frame 2 for mounting tools. A worm 53 that meshes with the worm gear 51 is keyed to a shaft 54 that is rotatably supported on a bracket 52 by a bearing, and a pulley 55 is keyed to the end of the shaft 54 that projects from the bracket 52. and large gear 5
A small gear 56 is keyed and the tool is mounted in such a way that a pulley 55 is rotated via a belt from a pulley 58 at the end of a shaft 57 which is supported by a bearing in the frame 2.

Directly below the threaded portion 4.6b of the operating rod 46, a follower mounting plate 62, which rotatably supports a cam follower 60 with a small shaft 61 perpendicular to the operating rod 46, is installed, and the axial position is adjustable. It is provided to be relatively rotatable. When mounting the follower, the base 62 is supported at both ends by the unit base 41 and the bracket 52, and is guided by guide rods 63 arranged on both sides parallel to the operating rod 46.

Furthermore, the tool operation table 42 has a cam follower 65 with a small shaft 64 perpendicular to the operation rod 46 on the side opposite to the cam follower 6o.
is pivotally supported, and the large gear 4 along with the cam follower 60
controlled by a cam that is rotated by That is, the mounting between the cam followers 60 and 65 between the tool operating table 42 and the bracket 52 is concentric with the position window 2a, and the tool is mounted on the bracket 66 fastened to the surface of the frame 2, and the mounting is perpendicular to the surface. That is, a gear shaft 67 is rotatably supported on a bearing in a direction perpendicular to the sliding direction of the tool operating table 42, and a gear 68 keyed to the lower end of this shaft meshes with the large gear 4.

Further, a disc cam 69 is keyed to the upper end of this gear shaft 67 and comes into contact with the cam follower 65, and a disc cam 70 concentrically fastened to the boss portion of the disc cam 69 comes into contact with the cam follower 60. There is. The follower is mounted so that the disk cam 69.70 and the cam follower 65.60 are always in contact with each other by means of springs (not shown) on the plate 62 and the tool operating table 42, respectively.

Manufacturing of the torsion coil spring as shown in FIG. 9 will be explained with reference to FIG. 7 showing an action control diagram and FIG. 8 showing each stroke. The feed roller 14 is rotated by the servo motor 1 by a command from an NC device (not shown), and the hook end straight portion of the spring is rotated by the servo motor 1.
b) is sent out.

Next, the small gear 6 is rotated by the large gear 4 rotated by the servo motor 7 in response to a command from the NC device, and the cam surface of the disk cam 69 rotates via the gear shaft 67. As shown in FIG. 7, it acts first to advance the tool operating table 42 toward the quill 12 via the cam follower 65. By this advancement, the operation cylinder 45 is advanced together with the forming tool T from the forming preparation position to the forming standby position. The disc cam 70 acts with a delay, and when the cam follower 60 is attached to the follower, the plate 62 is retracted and the operating rod 46 is retracted. Therefore, the connecting plate 47 rotates the tool holder 43 around the support shaft 44, and the forming tool T in the retracted position (imaginary line in FIG. (Fig. 8A)
), the forming surface Ta collides with the wire to be sent out to form the bent part (b) of the first hook, and after forming the 1/4 circle, the disc cam 70 is made inactive, and the operating rod 46 is advanced to move the forming tool T. Turn around and return to the evacuation position. At this time, the cam operating surface of the disk cam 69 is in the operating position because it has a wide width.

Next, the large gear 5 is activated by the servo motor 9 according to a command from the NC device.
Rotate the small gear 56. Axis 57. Pulley 58/55
．． The worm gear 51 is rotated by 90° via the worm 53. With this 90° rotation, the operating barrel 45 is rotated by the operating rod 46.
rotates 90 degrees and the tool holder 43. The forming tool T is rotated 906 around the quill axis (FIG. 8B). Further, the feed roller 14 is rotated by the servo motor 11 to feed out the wire to form a straight portion (c) of the engaging portion of the first hook.

The servo motor 7 is reversed, the large gear 4 is reversed, and the disc cam 69 returns on the cam action surface and continues to contact the cam follower 65, keeping the tool operating table 42 in the forward waiting position, and the disc cam 70 returns to the cam action surface again and the cam follower 60. The operating rod 4G is moved backward via the connecting plate 62.

For this reason, the tool holder 43 and the forming tool T are rotated and advanced to the front of the quill 12 from a direction deviated by 90 degrees from the previous direction, colliding with the wire being sent out and forming a bent part (d). ), after the 1/4 circle is formed, the disc cam 70 becomes inactive, the operating rod 46 is advanced, and the forming tool T is rotated in the opposite direction about the support shaft 44 to the retracted position.

The disc cam 69 continues to be located on the cam active surface.

The servo motor 9 is rotated, the large gear 5 is rotated, and the worm gear 51 is similarly turned further by 90 degrees.

As a result, the operation tube 45. The forming tool T is further rotated by 90° about the quill axis (FIG. 8D). Further, the feed roller I4 is rotated by the servo motor 11, and the wire is fed out to form the straight part (E) of the leg of the first hook.

The servo motor 7 rotates forward and the large gear 4 rotates the small gear 68.
1 disc cams 69 and 70 are rotated. The cam action surface of the disc cam 70 returns to the normal rotation direction, and the disc cam 69 returns the cam action surface 2 to the normal rotation direction, and the operating rod 4G is moved back to a position where the forming tool T has been rotated 90'. The quill 12 is rotated to the front of the quill 12 about the support shaft 44. The servo motor 11 is rotated to rotate the feed roller 14 and the quill 12 is rotated.
The stranded wire is sent out and brought into contact with the forming surface Ta of the forming tool T to form the coil body portion (FIG. 8E). If the coil body portion is long, the rotation of the servo motor 7 is stopped as necessary to maintain the disk cams 69, 70 at the working surface position. When the required number of coil turns is formed, the disk force 1.
70 becomes inactive and advances the operating rod 46 to move the tool boulder 43. The forming tool T is rotated to the retracted position. The disc cam 69 continues to be located on the cam active surface.

The servo motor 9 is rotated by the worm gear 5 from the large gear 5.
1 further rotated 90 degrees around the quill axis, and the operating rod 46
．． Tool holder 43. The forming tool T is further pivoted 90' around the quill axis (FIG. 8F).

During this time, the feed roller 14 is rotated by the rotation of the servo motor 11, thereby creating a straight part (G) of the leg of the second hook.

The servo motor 7 is rotated in the reverse direction and the disc cam 69 is connected to the large gear 4.
．． Turn 70 in the opposite direction. The cam action surface of the disc cam 70 is returned, the disc cam 69 returns to the action surface, the operating rod 46 is retracted, the forming tool T is advanced to the front of the quill 12, and the quill 1 is
1/4 arc (ヂ) by colliding with the wire rod sent out from 2.
is made, the disc cam 70 is made inactive, and the forming tool T is placed in the retracted position (FIG. 8G). No. - rotate the motor 9,
The worm gear 51 is further rotated 906 degrees around the quill shaft from the large gear 5, and the forming tool T is rotated 906 degrees around the quill shaft.
°Turn in the opposite direction (Fig. 8H).

The servo motor 11 is rotated to rotate the feed roller 4 to feed the wire from the quill 12 to form a straight line at the hooking portion of the second hook.

By rotating the servo motor 7 in the forward direction, the large gear 4 rotates the disc cam 6.
9. Rotate 70. The disc cam 69 continues to be a cam action surface, and the disc cam 70 is a cam action surface, and the operating rod 4
6 is moved back, and the forming tool T is rotated around the support shaft 44, advanced to the front of the quill 12, and collides with the wire being sent out.]/4 arc is formed, and the disc cam 70 is inactivated. position (Fig. 8 I).

The servo motor 7 rotates in the forward direction to rotate the disk cams 69 and 70, making both of them non-active surfaces. As the servo motor 11 rotates, the feed roller I4 feeds out the wire to form a straight portion at the end of the second hook.

Even when the servo motor 7 continues to rotate, the disc cam is 69°70
maintains the cam inactive position.

On the other hand, a disc cam 24 attached to a small gear (not shown) meshing with the large gear 4 pushes the cam follower 25 toward the center, and as the sliding body 22 advances, the cutting tool CT advances to the front of the quill 12 to cut the wire. Cut (Figure 8J). The disk cam 24 rotates to the cam non-action position and returns to its initial position, and the disk cams 69, 70 also return to their initial positions. The forming tool T is also retracted and returned to the ready position. One torsion coil spring is formed by one rotation of the pinion 56.68.

Example 2 FIG. 10 to FIG. 14 will be explained.

The molding device 81 is attached at a position opposite to that of the first embodiment on the frame 2''. Components that are the same as those in the previous embodiment are given the same reference numerals and explanations will be omitted. The holding roller 15 is pressed by the action of an air cylinder via the piston rod. When the diameter of the wire is small, it is pressed by the spring force interposed between the piston rods. When the diameter of the wire is large, this spring is killed and the holding roller 15 is pressed directly. wear.

The molding device 81, which has a particularly modified configuration, is similarly constructed as a unit, and the tool attachment is mounted on the frame 2. A gear shaft 83 is rotatably supported on a bearing portion 82a of the unit base 82 in a direction perpendicular to the raised surface. A small gear 56 that meshes with the large gear 5 as in the previous embodiment is keyed to the protruding end of the gear shaft 83, and a bevel gear 8 is attached to the other end of the gear shaft 83.
4 is keyed.

A gear shaft 85 is rotatably supported on the unit base 82 by a bearing so as to be perpendicular to the gear shaft 83 and parallel to the surface thereof, and a bevel gear 86 that meshes with the bevel gear 84 is attached to the end of the gear shaft 85 as a key. A wide gear 87 is also attached to the key. Further, a guide surface 82b parallel to the gear shaft 85 is formed on the upper surface of the unit stand 82, and a tool operating table 88 is slidably mounted on the guide surface 82b. Tool operation table 8
An upper stage part 88a is formed on the quill side of 8, and a stepped operation tube 89 whose rotation axis is the sliding direction of the tool operation base 88 is formed on this upper stage part 88a. It is rotatably supported by a radial ball bearing and a sliding bearing so that the axis coincides with the quill axis when the tool is rotated, and a thrust bearing receives the reaction force applied to the tool. A gear 90 is keyed to the small diameter portion 89a of the stepped operating barrel 89, and a window is bored at the position of the tool operating table 88 relative to the gear 90.
An intermediate gear 91 that meshes with the gear 90.87 is attached to the support shaft 9.
2 is rotatably supported. A center hole 89b is bored in the small diameter portion 89a of the stepped operation tube 89, and a deep groove 89d is cut out in the large diameter portion 89c with a width equal to the diameter of the center hole 89b, leaving only one surface in the diametrical direction.

An operating rod 93 is rotatably and axially movably supported in the small diameter hole 89b via a sliding bearing. Stepped operation tube 8
9 groove 89cl has #89d from the axis of the operating rod 93.
A tool holder 95 that slides into the deep groove 89d is pivotally supported by a support shaft 94 near the inlet toward the bottom side of the tool holder.

This tool holder 95 has a forming surface Ta on the axis of the operating rod 93.
A forming tool T having a molding tool T is opposite to the quill 12 and is replaceably attached on a line parallel to the axis of the operating rod 93 passing through the supporting shaft 94. The tool holder end on the opposite side and the L end of the operating rod 93 are connected by a connecting plate 97. At the rear end of the tool operating table 88, a cam follower 98 is attached to a shaft 99 perpendicular to the sliding direction.
A bracket 88b is provided between the cam follower 98 and the intermediate gear 91, and an air cylinder 100 having an axis parallel to the operating rod 93 is fixed thereto.

A connecting piece 102 fixed to the piston rod 101 of the air cylinder 100 is connected to the rear end of the operating rod 93 by a needle bearing and a thrust bearing so as to be able to rotate integrally in the axial direction. A stopper 96 is provided on the large diameter portion 89c of the stepped operating barrel 89, which rotates the tool holder 95 as the operating rod 93 moves forward and positions the forming tool T at a predetermined position in front of the quill 12.

Furthermore, the camshaft 1 is attached by a bearing to the bearing housing 103, which is attached to the hole 2a next to the frame 2.
04 is rotatably supported in parallel with the gear shaft 83, a small gear 68 that meshes with the large gear 4 is keyed at the tip on the same side as the small gear 56, and is keyed to the small gear 68 that meshes with the large gear 4 as in the first embodiment, and two cams are attached to the other end. Board 10
5a and 105b are fixed in a phase-adjustable manner. A composite cam 105 is formed by these two cam plates.

Furthermore, for tool mounting, a lever shaft 106 is mounted on the frame 2 between the unit base 82 and the composite cam 105, and a lever 107 for transmitting the amount of displacement of the composite cam 105 to the cam follower 98 is pivotally supported. A spring 10 keeps the connection surfaces of the cam follower 98 and the lever 107, and the cam follower 108 of the lever 107 and the composite cam 105 in contact at all times.
9 is stretched between the tool operation table 88 and the tool mounting pin on the frame 2. The unit of the molding apparatus constructed in this manner is mounted on the frame 2, as shown in FIG. 10, with the tool positioned at a radius of 2'2 with pins 110 so as to face the quill.

Manufacturing of the torsion coil spring as shown in FIG. 9 will be explained with reference to FIG. 15 which shows the action control '+B diagram and FIG. 8 which shows each stroke. The feed roller 14 is rotated by the servo motor 11 in response to a command from an NC device (not shown), and the straight hook end portion (A) of the spring is fed out.

Next, the small gear 68 is rotated by the large gear 4 rotated by the servo motor 7 in response to a command from the NC device, and the composite cam 105 of the camshaft 104 is rotated. The cam surface of the composite cam 105 rotates the lever 107 to advance the tool operating table 88 toward the cutting wheel 71 and the cutting 2 side via the cam follower 98. By this advancement, the operating cylinder 89 is advanced together with the forming tool T from the forming preparation position to the forming standby position. When the camshaft 104 rotates by a required angle according to the rotation command, pressurized air is sent to the rear chamber of the air cylinder 100 and the piston condo 101. The connecting piece 102 is advanced and the operating rod 93 is advanced. Therefore, the connecting plate 97 rotates the tool holder 95 around the support shaft 94, and the forming tool T in the retracted position (imaginary line in FIG. let (8th
In Figure A), the forming surface Ta collides with the wire being sent out to form the bent part (B) of the first hook, and after forming the 1/4 circle, the pressurized air of the air cylinder 100 is switched to the front chamber of the piston rod 1.
01. The connecting piece 102 is retracted, the operating rod 93 is retracted, and the forming tool T is reversely rotated and returned to the retracted position.

At this time, the cam action surface of the composite cam 105 is in the action position because it has a wide width.

Next, the large gear 5 is activated by the servo motor 9 according to a command from the NC device.
Rotate the small gear 56. Gear shaft 83° Bevel gear 84・
86. Gear shaft 85. Gear 90 is set to 9 by gears 87 and 91.
Rotate 0°. With this 90° rotation, the operating rod 93 is rotated 90° by the operating barrel 89, and the tool holder 95. Molding tool T
is rotated 906 times around the quill axis (Fig. 8B)
. Further, the feed roller 14 is rotated by the servo motor 11 to feed out the wire to form the straight portion (c) of the holding portion of the first f-7.

The servo motor 7 is reversed, the large gear 4 is reversed, the composite cam 105 returns on the cam action surface, and the lever 107 continues to be in contact with the cam follower 98, keeping the tool operating table 88 in the forward waiting position, and the cam At a predetermined rotational position of the shaft 104, the pressure air of the air cylinder 100 is switched to the rear chamber again, and the piston condo 101. The connecting piece 102 and the operating rod 93 are moved forward. Therefore, the tool holder 95, the forming tool T, is rotated and advances to the front of the quill 12 from a direction deviated by 90 degrees from the previous direction, colliding with the wire being fed out and forming a bent portion (d).
Figure 8C), 1. /4 After forming the circle, the pressurized air in the air cylinder 100 is switched, the operating rod 93 is moved back, and the forming tool T is rotated in the opposite direction about the support shaft 94 to the retracted position. The composite cam 105 continues to be located on the cam action surface.

The servo motor 9 is rotated, the large gear 5 is rotated, and the small gear 56 . Bevel gears 84 and 86. The gear 90 is further rotated by 90 degrees by the gears 87 and 9. With this, I
Operation tube 89. Operation rod 93. The forming tool T is further pivoted 906 about the quill axis (FIG. 8D). Further, the feed roller 14 is rotated by the servo motor 1 and the wire is fed out to form a straight leg portion (Po) of the first leg.

The servo motor 7 rotates forward and the large gear 4 rotates the small gear 68.
2 composite cam 105 is rotated. The composite cam 105 moves the cam action surface t back in the forward rotation direction, and the cam shaft 104
At a predetermined rotational position of
From the position where it has turned six times, it is turned to the front of the quill 12 about the support shaft 94. The servo motor 11 is rotated to rotate the feed roller 14, and the wire is fed out from the quill 12 so that it collides with the forming surface Ta of the forming tool T, and is sent to the coil body part.
(Fig. 8E). If the coil body becomes longer, the rotation of the servo motor 7 is stopped as necessary, and the composite cam 1
05 is kept in the working surface position. When the required number of coil turns has been formed, the pressurized air in the air cylinder 100 is switched to the front chamber, the operating rod 93 is retracted, and the tool holder 95.
The forming tool T is rotated to the retracted position. Synthetic cam 105
continues to be located on the cam action surface.

The revo motor 9 is rotated, and the stepped operation tube 89 is further turned 90' around the quill shaft by the large gear 5 via the gear group, and the operation rod 93. Tool holder 95. The forming tool T is further rotated by 90° around the quill axis (FIG. 8F). During this time, the feed roller 14 is rotated by the rotation of the servo motor 11, thereby creating a straight part (G) of the leg of the second hook.

The servo motor 7 is rotated in the reverse direction and the synthetic cam 10 is driven by the large gear 4.
Rotate 5 in the opposite direction. The composite cam 105 returns to its working surface, and at a predetermined rotational position of the cam shaft 104, the pressurized air of the air cylinder 100 is switched to the rear chamber, and the operating rod 93 is advanced to advance the forming tool T to the front of the quill 12, where it is sent out from the quill 12. The wire is brought into contact with the wire rod to form a 1/4 arc, the pressurized air of the air cylinder 100 is switched to the front chamber, and the forming tool T is rotated to the retracted position. (Figure 8G). Rotate the servo motor 9 to rotate the large gear 5. The stepped operation tube 89 is further moved around the quill shaft by the small gear 56 via the gear group.
The forming tool T is rotated by 90° around the quill axis (Fig. 8H). The servo motor 11 is rotated to rotate the feed roller 14 to feed the wire from the quill 12 to form a straight line at the hook of the second hook.

By rotating the servo motor 7 in the forward direction, the composite cam 1 is rotated from the large gear 4.
Rotate 05. The composite cam 105 continues to maintain the cam action surface and rotates the air cylinder 100 by a predetermined rotation of the camshaft 104.
The pressurized air is switched to the rear chamber, the operating rod 93 is advanced, and the forming tool T is rotated around the support shaft 94, advanced to the front of the quill 12, and collides with the wire being sent out to form a 1/4 arc (nu). After forming, the pressurized air of the air cylinder 100 is switched to the front chamber, and the operating rod 93 is moved back to bring the forming tool T to the retracted position.

(Figure 8 I).

The servo motor 7 rotates in the forward direction to rotate the composite cam 105, making it a cam non-active surface. As the servo motor 11 rotates, the feed roller 14 feeds out the wire to the straight section at the end of the second hook (
(Le) Even when the servo motor 7 continues to rotate, the composite cam 105 maintains the cam non-action position.

On the other hand, a disc cam 24 attached to a small gear (not shown) meshing with the large gear 4 pushes the cam follower 25 toward the center, and as the sliding body 22 advances, the cutting tool CT advances to the front of the quill 12 to cut the wire. Cut (Figure 8J). The disc cam 24 rotates to the cam non-action position and returns to its initial position, and the composite cam 105 also returns to its initial position. The forming tool T is also retracted and returned to the ready position. 1 rotation of small gear 56.68
torsion coil springs are formed.

Embodiment 3 In FIGS. 16 and 17 showing a cam drive instead of the air cylinder 100 of the molding device 81, the same related parts are given the same reference numerals and the changed parts will be explained.

A roller holder 112 with a cam follower 111 pivotally supported on the rear end of the operating rod 93 is connected to the tool operating table 8 so as to be integrally rotatable in the axial direction by means of a needle bearing and a thrust bearing.
8 so as to be slidable thereon. Further, a similar synthetic cam 113 is attached to the upper part of the camshaft 104 in a predetermined phase with the synthetic cam 105. Furthermore, the lever shaft 10
A lever 115 that pivotally supports a cam follower 114 that comes into contact with the cam follower 111 of the roller holder 112 and comes into contact with the composite cam 113 is pivotally supported on the lever 6 . Therefore, the movement of the operating rod 93 by the action of the air cylinder 100 is now carried out by the composite cam 113, and the camshaft 104
The cam follower performs the same function as the cam follower of the first embodiment in normal and reverse rotation.

Effects As detailed above, the present invention allows one forming tool to rotate around the quill axis, and also allows the forming tool to rotate in a plane that includes the quill axis between the forming position and the retracted position on the front surface of the quill. , one tool can function as a variety of tools, making it possible to perform a variety of complex bending operations, and easily adapting to changes in the shape of torsion coil springs.

[Brief explanation of drawings]

Fig. 1 is a front explanatory view of the spring forming device of the present invention, Fig. 2 is a partially cross-sectional side explanatory view, Fig. 3 is a longitudinal cross-sectional view of the forming member, Fig. 4 is a plan view thereof, and Fig. 5 is an explanatory side view of the spring forming device of the present invention. Figure 3 is a cross-sectional view taken along the line A-A, Figure 6 is a diagram showing the intermediate shaft from the large gear, Figure 7 is a diagram showing time juggling such as cam line feeding, and Figure 8 is a diagram showing the spring forming process. , FIG. 9 is a diagram of an embodiment of a torsion coil spring, (a) is a front view, (b) is a side view, FIG. 10 is a front explanatory diagram of the spring forming apparatus of the second embodiment of the present invention, and FIG. The figure is an explanatory view of the same side, Figure 12 is a sectional view of the molding device, and Figure 13 is a sectional view of the molding device.
The figure is a BB view, Fig. 14 is a plan explanatory diagram showing the tool installation in the frame and the timing is arranged, Fig. 15 is a diagram showing time juggling of cams, line feeds, air cylinders, etc., Fig. 16 17 is a sectional view of the third embodiment of the molding device, and FIG. 17 is a sectional view of the cam and lever. 2...Tool installation is frame 4,5...Large gear 7.9
．． 11... Servo motor 12... Quill 14...
Feeding roller 15...Press roller 20...Cutting device 40.81...Forming device 42.88...
・Tool operation table 43.95・・Tool boulder 45.89
・・Operation cylinder 46.93 ・・Operation rod 51 ・・Worm gear 100 ・・Air cylinder 69.70 ・
・Disc cam 1.05,113...Synthetic cam 25.60
,65,98,108,114...Cam follower T
・Forming tool CT・Cutting tool Fig. 1 Fig. 2

Claims (3)

[Claims] (1) In a method of manufacturing a coil spring by advancing a forming tool in front of a wire rod fed out from a quill, by rotating one forming tool so that the direction of the forming surface faces the direction in which the wire rod is formed. A spring forming method characterized by forming a hook portion and forming a coil portion. (2) In a spring forming device in which a forming tool advances to the front of a wire rod fed out from a quill and abuts the wire rods to form a coil portion or a hook portion, the forming tool can be rotated and positioned about the axis of the quill. and provided so as to be rotatable and positionable within a plane including the quill axis, a first driving means for rotating the quill axis about the quill axis, and a second driving means for rotating the quill axis within a plane including the quill axis;
A spring forming device characterized in that the first drive means and the second drive means are associated so as to act in synchronization with wire feeding. (3) The spring forming device according to claim 2, wherein the forming tool is movable in the quill axis direction.