JPS6238055B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing springs used for pine tresses, bottom pine tresses, and the like.

For example, the structure described below is known as a spring unit used in the bottom mattress of a bed. That is, a main spring is formed from a single wire rod, and includes a straight section and a pair of spring sections whose upper ends are continuous to both ends of the straight section. Then, the linear portions of a large number of main springs are arranged in a grid pattern on a rectangular plate-shaped base.
A lower end of the spring portion located at a peripheral portion of the base body is fixed to the base body.

Furthermore, the linear portions of the main springs arranged in a lattice pattern are reinforced by intermediate support springs. This intermediate support spring, like the main spring described above, consists of a straight part and a pair of spring parts whose upper ends are continuous with both ends of this straight part. The intermediate support spring has an upper end connected to the straight part of the main spring, and a lower end fixed to the base body.

Conventionally, in the spring unit configured as described above, the spring portions of the main spring and the intermediate support spring have been formed as torsion bar spring portions. The torsion bar spring portion has a small amount of deformation under compressive load. In other words, while it has the hardness to reliably support the user, it also has the ability to withstand repeated compressive loads.
Permanent distortion is likely to occur. Therefore, the spring unit has the disadvantage that it quickly loses its elasticity.

Therefore, it has been considered to make the spring part a helical spring part as a spring to eliminate such defects. If the above spring part is made into a spiral spring part,
Since the torsion bar spring part is less prone to deterioration, the elasticity of the spring unit can be maintained well over a long period of time. however,
Since no manufacturing equipment has been developed to mass-produce springs in which spiral spring parts are continuously molded at both ends of a straight part, it is not possible to use such springs to form spring units for bottom pinerests, etc. Ta.

This invention was made based on the above-mentioned circumstances, and its purpose is to mass-produce a spring in which a straight portion and a spiral spring portion are continuously formed at both ends of the straight portion using a single wire rod. The purpose of the present invention is to provide a spring manufacturing device that can perform the following steps.

An embodiment of this invention will be described below with reference to FIGS. 1 to 23.
This will be explained with reference to the figures. The spring manufacturing apparatus shown in FIGS. 1 and 2 includes a main body 1. The spring manufacturing apparatus shown in FIGS. A wire rod accumulation section 5 shown in FIGS. 2 to 4 is provided on the upper surface of the main body 1. This accumulation section 5 is constructed as follows. In other words, three mounting members 7 are provided on the upper surface of the main body 1 and are tilted low toward the front side of the main body 1. On the upper surface side of the pair of mounting members 7 located at both ends of the main body 1 in the longitudinal direction, a presser member 9 is arranged at a predetermined distance from the upper surface. In addition, a notch 13 of the transfer plate 11 is provided on the top surface of the distal end of the mounting member 7.
One end portion where is formed is fixed. Further, a recess 15 is formed at the tip of the holding member 9 corresponding to the notch 13 . The other end of the delivery plate 11 is connected to the upper surface of the main body 1 by the mounting member 7.
It is located on the upper surface of a rectangular receiving plate 17 that is inclined at approximately the same angle as , and is disposed at a lower position than the mounting member 7 . In addition, the notch 13 of the delivery plate 11
An ejecting cylinder 19 is arranged on the lower surface side corresponding to the lower surface side. A push-up body 25 having a tapered surface 23 is fixed to the rod 21 of the cylinder 19. Further, in the gap between the mounting member 7 and the holding member 9, a large number of wire rods 27 of a predetermined length are accumulated in a freely rolling manner. The wire rod 27 located at the tip is in contact with the end surface of the transfer plate 11. Therefore, when the ejecting cylinder 19 operates and the rod 21 rises, the wire rod 27 located at the most distal end comes out of contact with the transfer plate 11, rolls on the transfer plate 11, and moves to the receiving plate. It reaches 17. Note that guide plates 29 are provided outside both sides of the pair of mounting members 7 on the upper surface of the main body 1 to prevent the wire rod 27 from shifting in the axial direction.

The wire rod 27 that has rolled onto the receiving plate 17 is moved to a first stopper 3 provided at the center of the upper surface of the main body 1.
1 and second stoppers 33 provided at both ends, and its rolling is prevented. Above receiving plate 1
As shown in FIG.
7 is provided. As shown in FIGS. 6 and 7, this movable plate 37 is connected to a rod 41 of a drive cylinder 39 provided on the lower surface of the receiving plate 17, and is driven by this cylinder 39 in the direction shown by the arrow in FIG. That is, it is driven along the axial direction of the wire rod 27. A positioning cylinder 43 is provided on the upper surface of the movable plate 37, and this rod 45 is attached to the push plate 4.
7 is provided. A through hole 49 is formed in the movable plate 37, and a rotary plate 51 is rotatably provided in the through hole 49 flush with the receiving plate 17. A rod 55 of a first rotating cylinder 53 held by the movable plate 37 is connected to the lower surface of the rotating plate 51. This rod 55 is adapted to rotate by a predetermined angle, for example 90 degrees, when the cylinder 53 is actuated. Further, a center pin 57 is provided on the upper surface of the rotary plate 51 at the center of rotation.
is provided protrudingly, and a bearing 59 is provided at a position offset from the center at a predetermined distance from the center pin 57. Then, the wire rod 27 is rolled by the push-up cylinder 19 and the receiving plate 17 is rotated.
When it comes to the top, the end of the wire 27 enters between the center pin 57 of the rotating plate 51 and the bearing 59.
In this state, the positioning cylinder 43 operates to press both ends of the wire 27 with the push plate 47, thereby positioning the wire 27 in the axial direction. Next, a gripping arm 61 (to be described later) clamps the middle part of the wire 27, and the rotating cylinder 53 is operated to rotate the rotary plate 51 by 90 degrees. depending on the second
A bent portion 27a shown in FIG. 2 is formed. and,
After the rotary plate 51 returns to its original position, the drive cylinder 39 is operated to drive the movable plate 37, and the center pin 57 is moved from the bent portion 27a of the wire 27 to the center pin 57.
leaves.

In this way, the wire rod 27 with the bent portions 27a formed at both ends is taken out from the upper surface of the main body 1 by a pair of gripping arms 61, which are a taking-out mechanism.
That is, as shown in FIG. 2, on the front end side of the upper surface of the main body 1, a mounting shaft 63 is rotatably supported along the longitudinal direction of the main body 1 by a plurality of bearings 65. A rod 69 of a second rotating cylinder 67 is connected to one end of this mounting shaft 63. and,
The mounting shaft 63 is configured to be rotated by a second rotating cylinder 67 through a predetermined angle, for example, within a range of approximately 270 degrees. The pair of gripping arms 61 are connected to a midway portion of the mounting shaft 63. In other words, the gripping arm 61 is
As shown in the figure, a base 71 having one end fixed to the mounting shaft 63, a drive cylinder 73 provided at the other end of the base 71, and a hook 77 pivotally attached to a rod 75 of the drive cylinder 73. The sleeve 79 is fitted onto the rod 75 and fixed to the cylinder 73. A groove 80 is formed at the tip of this sleeve 79, and the hook 77 is inserted into this groove 80, and a pin 82 protruding into this groove 80 is inserted into a guide hole 84 formed in the hook 77. is inserted into. Therefore, when the rod 75 of the drive cylinder 73 is operated in the retracting direction, the hook 77 rotates in the direction of the arrow shown in FIG. The pair of gripping arms 61 are positioned on the upper surface side of the main body 1 until the movable plate 37 is driven by the actuation of the drive cylinder 39 and the center pin 57 is separated from the bent portion 27a of the wire 27. Therefore, the midway portion of the wire 27 that has been positioned by the operation of the positioning cylinder 43 engages between the hook 77 and the end surface of the sleeve 79, and the drive cylinder 73 is actuated to lock the hook 77.
is rotated, and the hook 77 and sleeve 79
It is held between the end faces of. Then, the drive cylinder 39 is operated, the movable plate 37 is driven, and the wire rod 27 is driven.
When the center pin 57 separates from the bent portion 27a,
The second rotary cylinder 67 operates to rotate the arm 6.
1 is rotated approximately 270 degrees. Then, the wire rod 27 is located opposite to the front surface of the main body 1.

As shown in FIG. 1, a channel-shaped horizontal member 81 is installed on the front surface of the main body 1 along its longitudinal direction. A pair of guide rails 83 are laid in parallel on the upper surface of this horizontal member 81, and a rack 85 is provided on the lower surface. The above guide rail 83
A pair of movable bodies 87 are provided so as to be freely movable. In other words, the movable body 87 is formed by integrally joining the lower housing 89 and the upper housing 91, and the lower housing 8
As shown in FIGS. 10 and 11, a pair of receivers 93 are provided on the inner surface of the upper portion of the guide rail 9 to slidably engage with the guide rail 83. As shown in FIGS. moreover,
A pair of first support shafts 95 are rotatably installed in the lower housing 89 in the front-rear direction. These first
A first gear 97 is fitted onto the support shaft 95 and meshes with the rack 85. In addition, the lower housing 89
The second support shaft 1 has a second gear 99 fitted therein.
01 is rotatably installed, and the second gear 99
is in mesh with one of the first gears 97. One end of the second support shaft 101 protrudes toward the back side of the lower housing 89, and a first sprocket 103 is fitted onto this protruding end. Further, a drive motor 105 is provided in the lower housing 89, and this rotating shaft 1
07 protrudes from the rear side of the lower housing 89, and a second sprocket 109 and a third sprocket 111 are fitted to the protruding ends. A first chain 113 is stretched between the first sprocket 103 and the second sprocket 109,
The rotation of the rotating shaft 107 of the drive motor 105 is transmitted to one of the first gears 97 via this chain 113 . Therefore, the movable body 87 is driven to travel along the pair of guide rails 83 by the rotation of the first gear 97.

On the other hand, the upper housing 91 rotatably supports a third support shaft 115 and a fourth support shaft 117 that penetrate in the front-rear direction. The upper housing 91
A fourth sprocket 119 and a fifth sprocket 121 are fitted onto one end of the third support shaft 115 that protrudes toward the rear side. A second chain 127 is stretched between the fourth sprocket 119 and the third sprocket 111. Furthermore, a third gear 129 and a fourth gear 131, which mesh with each other, are fitted into the middle of the third support shaft 115 and the fourth support shaft 117, respectively.
Furthermore, a holding roller 135 having a groove 133 formed on the outer circumferential surface is fitted to the other end of the third and fourth support shafts 115 and 117 that protrude toward the front side of the upper housing 91, respectively. The pair of holding rollers 135 are vertically spaced apart from each other at an interval larger than the diameter of the wire rod 27, and when the other end of the fourth support shaft 117 rotates upward, the pair of holding rollers 135 The interval between becomes narrower. In other words, the fourth support shaft 1
Both ends of 17 are swingably supported by self-aligning bearings 137 on the upper housing 91, and one self-aligning bearing 137 supports the other end.
is held by the slide body 139. As shown in FIG. 12, this slide body 139 is slidably inserted into a slide groove 141 formed along the vertical direction in the front plate 91a of the upper housing 91. A push-up cylinder 143 is disposed at the lower end of the slide groove 141. Receptacles 145 are provided on the rod (not shown) of this cylinder 143 and on the lower end surface of the slide body 139, respectively, and a compression spring 14 is provided between these receptacles 145.
7 is interposed. Therefore, when the push-up cylinder 143 operates and the compression spring 147 is compressed, the slide body 139 is raised by the restoring force of the compression spring 147, and the fourth support shaft 11
7 swings. The push-up cylinder 143 has the pair of gripping arms 61 connected to the second rotating cylinder 6.
7, the main body 1 is rotated 270 degrees from the upper surface to the front side, and then the main body 1 is activated. That is, when the gripping arm 61 rotates and both ends of the wire 27 are inserted between a pair of spaced apart holding rollers 135 of a pair of movable bodies 87, the lifting cylinder 143 is activated to hold the lower side. Raise the roller 135.
Therefore, both ends of the wire 27 are held by each pair of holding rollers 135 so as not to be pulled out from these grooves 133. In addition, at this time, the wire rod 27
The bent portions 27a formed at both ends face downward as shown in FIG.

Further, on the front plate 91a of the upper housing 91, an auxiliary guide body 14 is provided on the side of the holding roller 135.
8. An ejection pin 149, a guide body 151 and a forming roller 153 are provided in this order, and a pitch rod 155 is provided between the guide body 151 and the forming roller 153. As shown in FIG. 14, the ejecting pin 149 is connected to one end of a link 159 whose midway portion is pivoted to a bracket 157 provided on the inner surface of the front plate 91a of the upper housing 91. The other end of this link 159 is pivotally connected to a rod 163 of an actuating cylinder 161. Therefore, when the actuating cylinder 161 is actuated and the rod 163 is pulled in the direction of the arrow,
The ejecting pin 149 protrudes from the front plate 91a. Further, the guide body 151 is formed into a disk shape, and is eccentrically fixed to a rod 167 of a third rotating cylinder 165 disposed within the upper housing 91, as shown in FIGS. 15 and 16. There is. This guide body 151 has an insertion groove 169 formed therein. Then, the wire 27 is attached to a pair of holding rollers 135
When the wire rod 27 is fed between the two ends, both ends of the wire rod 27 are inserted into the insertion groove 169. Further, the guide body 151 is rotated by the third rotating cylinder 165 at an angle of approximately 90 degrees. The third rotary cylinder 165 operates after spiral spring portions 27b shown in FIG. 24 are formed on both ends of the wire 27, as will be described later. In addition, the forming roller 15
3 has a guide groove 17 on the outer peripheral surface as shown in FIG.
1 is formed and is movably provided on the front plate 91a as described later. Furthermore, the pitch rod 155 is provided at one end of a protruding shaft 175, as shown in FIGS. 17 to 19. This protruding shaft 175 has a rectangular cross section, and a receiver 177 disposed inside the upper housing 91
It is supported so that it can slide freely. A cam follower 179 is provided at the other end of this protruding shaft 175, and this cam follower 179 is in contact with a cam surface 183 of a cam 181. This cam 181 is fitted onto a fifth support shaft 185 rotatably supported by the receiver 177. In addition, the protruding shaft 17
A tension spring 187 is stretched between one end of the cam 5 and the receiving body 177, so that the cam follower 179 is pressed against the cam surface 183 of the cam 181. Further, a sixth sprocket 189 is fitted to the fifth support shaft 185, and a tenth sprocket is connected to the sixth sprocket 189 and the fifth sprocket 121 fitted to the third support shaft 115. As shown in the figure, a third chain 191 is stretched. Therefore, when the drive motor 105 is operated and the third support shaft 115 is rotated, the cam 181 is adapted to be interlocked with the rotation. The number of teeth of the fifth sprocket 121 and the sixth sprocket 189 is adjusted so that the fifth support shaft 185, that is, the cam 181 rotates once while the helical spring portion 27b is formed at the end of the wire 27. ratio is set.

On the other hand, the forming roller 153 is provided as shown in FIGS. 17 to 20. That is, a guide groove 205 is formed in the front plate 91a of the upper housing 91 of the movable body 87 along the width direction. A support body 207 is slidably provided in this guide groove 205. A mounting shaft 209 is provided through the support body 207 in the thickness direction. The forming roller 153 is fitted onto one end of the mounting shaft 209 that protrudes toward the front side, and the forming roller 153 is fitted into the housing 9.
A cam follower 211 is fitted to the other end located inside the cam follower 211 . Further, a sixth support shaft 213 is rotatably supported in parallel to the fifth support shaft 185 on a receiver 177 disposed within the upper housing 91 . A cam 215 is fitted to one end of this sixth support shaft 213. Further, the support body 207 is urged in the direction of the arrow by a tension spring 217, and a cam follower 211 provided on the support body 207 is in pressure contact with the outer peripheral surface of the cam 215. Further, pulleys 219 having the same number of teeth are fitted to the other ends of the sixth support shaft 213 and the fifth support shaft 185, and a chain 211 is stretched around these pulleys 219. Therefore, when the movable body 87 travels and the fifth support shaft 185 is rotated, the cam 215 rotates together with the sixth support shaft 213.
A support body 207 to which a forming roller 153 is attached by means 5 slides along a guide groove 205 .
That is, since the forming roller 153 is displaced according to the shape of the cam 215, the distance between the forming roller 153 and the guide body 151 shown in FIG. The diameter of the helix can be varied.

Further, as shown in FIG. 1, the horizontal member 81 installed on the main body 1 has a pair of first limit switches 193 at the center portion in the longitudinal direction and a pair of second limit switches 195 at both ends in the longitudinal direction. It is provided. These limit switches 193,
Reference numeral 195 is electrically connected to a drive motor 105 provided on the movable body 87, and regulates the travel range of the movable body 87. In other words, the pair of movable bodies 87
When the vehicle moves toward the vehicle, the vehicle is stopped by operating the first limit switch 193, and when the vehicle travels away from the vehicle, the vehicle is stopped by operating the second limit switch 195.

Next, the operation of manufacturing a spring using the above manufacturing apparatus will be explained. First, when a start switch on an operation panel (not shown) is turned on, the ejecting cylinder 19 is operated and one wire rod 27 is sent out from the collecting section 5. The wire rod 27 rolls on the transfer plate 11 and comes into contact with the first and second stoppers 31 and 33. Next, the positioning cylinder 43 is operated to position the wire rod 27 along the longitudinal direction of the main body 1, and then the drive cylinder 73 of the gripping arm 61 is operated and the hook 77 locks the wire rod 27 in the longitudinal direction.
The middle part of 7 is clamped. Then, the first rotating cylinder 53 operates to rotate the rotating plate 51 by 90 degrees, and the center pin 87 provided on the rotating plate 51
and bearings 59 form bent portions 27a at both ends of the wire 27.

Bent parts 27a are formed at both ends of the wire 27,
When the movable plate 37 is driven by the actuation of the drive cylinder 39, the second rotation cylinder 67 is actuated to rotate the gripping arm 61 approximately 270 degrees, and attach both ends of the wire 27 to each movable body 87. The holding roller 135 is inserted between the pair of holding rollers 135. Then, the push-up cylinder 143 provided on the movable body 87 operates to push up the lower holding roller 135, and both ends of the wire 27 are held by the grooves 133 of the pair of holding rollers 135. Also,
When the push-up cylinder 143 operates to hold both ends of the wire 27, the gripping arm 61 returns to its initial state.

Next, the drive motor 105 of the pair of movable bodies 87
is activated, the pair of holding rollers 135 rotate in the direction shown by the arrow in FIG. 1, pull in both ends of the wire rod 27, and the pair of movable bodies 87 move from the separated state shown in FIG. 1 to the direction toward each other. However, both ends of the wire rod 27 are relatively let out from between the pair of holding rollers 135. Therefore, the bent portions 27a formed at both ends of the wire 27 are connected to the forming roller 15.
Both ends of the wire rod 27 are bent into a spiral shape in contact with the outer circumferential surface of the wire rod 3 . At this time, since the bent portions 27a formed at both ends of the wire 27 face downward, both ends of the wire 27 are bent downward. The diameter of the spiral is determined by the distance D between the guide body 151 and the forming roller 153 as shown in FIG.
determined by. In this way, when one spiral is formed at both ends of the wire rod 27, the pitch rod 1
55 protrudes forward from the plate surface of the front plate 91a of the upper housing 91 and pushes up the spiral formed in the wire rod 27. In other words, as the movable body 87 moves, the fifth support shaft 185 to which the cam 181 is fitted
rotates, the cam surface 183 of the cam 181
The cam follower 179 in contact with moves from the bottom dead center to the top dead center, the ejection shaft 175 is displaced, and the pitch rod 155 is ejected. Therefore, after one spiral is formed at both ends of the wire 27,
The spiral formed sequentially as the pair of movable bodies 87 travel is formed with a pitch P shown in FIG. 24 that corresponds to the amount of protrusion of the pitch rod 155.
Then, when the pair of movable bodies 87 actuate the first limit switch 193 and stop moving, the forming of the helical spring portion 27b having a predetermined number of turns is completed. In other words, the wire rod 27
As shown in FIG. 24, a spring 197 is formed which includes a straight portion 27c and a spiral spring portion 27b whose upper end is continuous with both ends of the straight portion 27c. By the way, when the movable body 87 travels to form the spring 197, when the fifth support shaft 185 rotates, the sixth support shaft 213 also rotates. When the sixth support shaft 213 rotates, the cam follower 2
11 is provided with the guide groove 205.
Slide along. Therefore, since the distance between the forming roller 153 provided on the support body 207 and the guide body 151 provided on the rod 167 of the third rotating cylinder 165 changes, the wire 2
The diameter of the spiral formed at both ends of 7 changes.

In other words, as the sixth support shaft 213 rotates, the forming roller 153 moves toward the guide 1 as shown by A in FIG.
If the shape of the cam 215 is set so that the distance from the cam 51 changes, the shape of the helical spring portion 27b can be
As shown in Figure 4, it becomes a bundle shape. Moreover, if the above-mentioned interval is changed in the state shown in B, the helical spring part 27
b becomes an inverted conical shape as shown in FIG. 25, and if changed in the state shown in C, it becomes a conical shape as shown in FIG. 26. That is, the shape of the helical spring portion 27b can be arbitrarily changed by the cam 215 to form the spring 197 with desired performance.

When the helical spring portion 27b is formed in this way, the third rotating cylinder 165 is activated to move the guide body 151 in the direction indicated by the arrow in FIG.
Rotate 90 degrees. Then, both ends of the straight portion 27c inserted into the insertion groove 169 of the guide body 151 are bent at approximately 90 degrees, and the helical spring portion 27
A linear bent portion 27d continuous to the last spiral of b
is formed. This bent portion 27d is used to connect the frame lines 199 with clips 201 as shown in FIG. That is, a large number of springs 1
When a spring unit is formed by assembling these linear portions 27c in a lattice shape, the frame line 199 is provided around the periphery of the spring unit. In this case, since the frame line 199 and the straight portion 27d are connected by the clip 201 in a line-contact state, their connected state is ensured.

In this way, the straight portion 27c of the spring 197
When the bent portions 27d are formed at both ends, the urging of the lower holding roller 135 by the push-up cylinder 143 is released, and the pair of holding rollers 13
5 separates, the actuating cylinder 161 operates and the ejector pin 149 protrudes. Therefore, this ejecting pin 149 causes the spring 1 to
Since the straight portion 27d of the spring 197 is pressed, the spring 197 falls toward the front side of the main body 1.

When the spring 197 is dropped from between the pair of holding rollers 135, the pair of movable bodies 87 move in the direction of separation. And these movable bodies 87
When the second limit switch 195 is activated and stopped, the above-described process is repeated again to form the spring 197 from the wire 27.

As described above, according to the present invention, it is possible to provide an apparatus for mass producing springs in which a straight portion and spiral spring portions are continuously formed at both ends of the straight portion using a single wire rod. .
Furthermore, since this device allows the shape of the helical spring portion to be changed to a wrapper shape, a conical shape, an inverted conical shape, etc., a spring with desired performance can be obtained.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a front view of the device, FIG. 2 is a plan view, FIG. 3 is a plan view of the accumulation section, FIG. 4 is a side view, and FIG. FIG. 6 is a plan view of the portion where bent portions are formed at both ends of the wire sent out from the accumulation section, and FIG. 5-
7 is a sectional view taken along the line of FIG. 5, FIG. 8 is a plan view of the grip arm, FIG. 9 is a side view, and FIG. Figure 11 is a sectional view taken along line XI-XI in Figure 10,
13 is a plan view of the movable body, FIG. 14 is a plan view of the ejector pin mounting structure, and FIG. 15 is a sectional view of the guide body mounting structure. Fig. 16 is a sectional view taken along the line of Fig. 15, Fig. 17 is a plan view of the forming roller mounting structure, Fig. 18 is a front view, and Fig. 19 is a sectional view taken along the line of Fig. 15.
Figure - Sectional view along the line, Figure 20 is the 17th
Figure 21 is an enlarged view of the upper front surface of the movable body, Figure 22 is a plan view of the wire with a bent part formed at the end, and Figure 23 is a sectional view taken along the line. Explanatory diagrams showing various changes in the distance between the accompanying forming roller and the guide body, Figures 24 to 2
FIG. 6 is a perspective view of a spring formed according to the change in the spacing, and FIG. 27 is a plan view of the spring with a frame line connected to it. 1... Main body, 27... Wire rod, 83... Guide rail, 87... Movable body, 135... Holding roller (holding mechanism), 151... Guide body, 153... Forming roller, 155... Pitch rod, 215...Cam (drive mechanism).

Claims (1)

[Scope of Claims] 1. An apparatus main body, a guide rail provided substantially horizontally along the width direction of the main body, and a pair of movable bodies provided so as to be able to move toward and away from the guide rail, A holding mechanism is provided on each of the movable bodies and includes a pair of holding rollers that hold both ends of the wire supplied in a straight line. a forming roller that comes into contact with the end of the wire that is relatively fed out from the holding mechanism as the pair of movable bodies move in a direction approaching each other, and curves both ends of the wire into a spiral shape; An insertion groove is provided between the forming roller and the holding mechanism, into which the end of the wire is slidably inserted and held, and the diameter of the helix formed on the wire is determined by the distance from the forming roller. a guide body, and a drive mechanism that drives the forming roller according to the travel of the movable body and changes the distance between the forming roller and the guide body to control the diameter of the spiral formed at both ends of the wire rod. and a pitch rod provided between the guide body and the forming roller to determine the pitch of the spiral formed by the guide body and the forming roller. 2. The guide body is driven to rotate approximately 90 degrees at the time when the spiral spring portion is formed on both ends of the wire rod, and both ends of the straight portion of the wire rod continue to the last formed spiral of the spring portion. 2. The spring manufacturing apparatus according to claim 1, wherein the spring is bent at a substantially right angle.