JPS632692B2 - - 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. However, the straight part is shorter than the main spring. The upper end of the spring portion of the intermediate support spring is connected to the straight portion of the main spring by a clip, and the lower end is 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, although it has the hardness to reliably support the user, permanent strain is likely to occur when subjected to repeated compressive loads. 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.

Further, the upper end of the spring portion of the intermediate support spring is connected to the straight portion of the main spring by a clip. However, since the spring part is curved and the straight part is straight, these two parts are connected in a point contact state, so the connection state is uncertain and may loosen with long-term use. There were cases where the straight portion of the main spring was not sufficiently reinforced.

The present invention has been made based on the above circumstances, and its object is to provide a main spring and an intermediate support 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. To provide a spring manufacturing device capable of mass-producing springs, and in the case of intermediate support springs, forming bent parts at both ends of the straight part that make line contact with the straight part of the main spring. be.

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show a first molding device, which comprises a main body 1. FIG.
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 structured as follows. In other words, body 1
Three mounting members 7 are provided on the upper surface of the main body 1 and are inclined low toward the front side of the main body 1. Main body 1
A presser member 9 is disposed on the upper surface side of the pair of mounting members 7 located at both ends in the longitudinal direction, spaced apart from the upper surface by a predetermined distance. Further, one end portion of the transfer plate 11 in which the notch 13 is formed is fixed to the upper surface of the distal end portion of the mounting member 7. Further, a recess 15 is formed at the tip of the holding member 9 corresponding to the notch 13 . The other end of the transfer plate 11 is connected to a rectangular receiving plate 17 that is inclined at approximately the same angle as the mounting member 7 and disposed at a lower position than the mounting member 7 on the upper surface of the main body 1. It is located on the top. Further, a protruding cylinder 1 is provided on the lower surface side corresponding to the notch 13 of the delivery plate 11.
9 is placed. 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 stopped by a first stopper 31 provided at the center of the upper surface of the main body 1 and a second stopper 33 provided at both ends.
The rolling contact is prevented by contacting the As shown in FIG. 5, the receiving plate 17 has an open notch 35 formed on its side end surface, and a movable plate 37 is provided in this notch 35. As shown in FIG. 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 rod 27 with the push plate 47, thereby positioning the wire rod 27 in the axial direction. Next, a gripping arm 61 (to be described later) grips the middle part of the wire 27, and the rotary cylinder 53 is activated to hold the rotary plate 5.
1 is rotated 90 degrees, and a 20th
A bent portion 27a shown in the figure is formed. After the rotary plate 51 returns to its original position, the drive cylinder 39 is operated to drive the movable plate 37,
The center pin 57 separates from the bent portion 27a of the wire 27.

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 the middle part of the mounting shaft 63. In other words, the gripping arms 61 have one end fixed to the mounting shaft 63 as shown in FIGS. 8 and 9. a drive cylinder 73 provided at the other end of the base 71; a hook 77 pivotally attached to a rod 75 of the drive cylinder 73;
5 and a sleeve 79 that is fitted onto the outside of the cylinder 73 and fixed to the cylinder 73. A groove 80 is formed at the tip of the sleeve 79, and the hook 7 is inserted into this groove 81.
7 is inserted, and a pin 82 protruding into this groove 80 is inserted into a guide hole 84 formed in the hook 77. 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
is located on the upper surface side of the main body 1 until the drive cylinder 39 is actuated to drive the movable plate 37 and the center pin 57 separates from the bent portion 27a of the wire 27. Therefore, the middle part of the wire rod 27 positioned by the operation of the positioning cylinder 43 is attached to the hook 77.
and the end surface of the sleeve 79, and the driving cylinder 73 is operated to rotate the hook 77, and the hook 77 is held between the hook 77 and the end surface of the sleeve 79. And the drive cylinder 39
When the movable plate 37 is activated and the center pin 57 is separated from the bent portion 27a of the wire 27, the second rotating cylinder 67 is activated and the arm 61 is rotated approximately 270 degrees. Then, the wire rod 27
are located opposite to the front part 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 shaft 115 and a fourth support shaft 117 that extend through the upper housing 91 in the front-rear direction. A fourth sprocket 119 and a fifth sprocket 121 are fitted to one end of the third support shaft 115 protruding toward the rear side of the upper housing 91. 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
17 are swingably supported by self-aligning bearings 137 of 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 117
sways. The push-up cylinder 143 has the pair of gripping arms 61 connected to the second rotating cylinder 67.
It operates after being rotated 270 degrees from the upper surface of the main body 1 to the front side by the . 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 that they do not come out of these grooves 133. At this time, the bent portions 27a formed at both ends of the wire 27 face downward as shown in FIG. 19.

Further, on the front plate 91a of the upper housing 91,
Auxiliary guide body 14 is placed 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 in a disk shape and is attached to the upper housing 9 as shown in FIGS. 15 and 16.
It is eccentrically fixed to a rod 167 of a third rotating cylinder 165 disposed within the cylinder 1. This guide body 151 has an insertion groove 169 formed therein.
When the wire 27 is fed between the pair of holding rollers 135, both ends of the wire 27 are inserted into the insertion groove 169. In addition, the guide body 15
1 is approximately rotated by the third rotating cylinder 165.
It is rotated at a 90 degree angle. The third rotary cylinder 165 operates after spiral spring portions 27b shown in FIG. 21 are formed on both ends of the wire 27, as will be described later. Further, as shown in FIG. 15, the forming roller 153 has a guide groove 171 formed on its outer peripheral surface, and a mounting shaft 17 on the front plate 91a.
3, it is rotatably supported. Furthermore, the pitch rod 155 is provided at one end of a protruding shaft 175, as shown in FIGS. 17 and 18.
This protruding shaft 175 has a rectangular cross section, and is slidably supported by a receiver 177 disposed within the upper housing 91. A cam follower 179 is provided at the other end of the roller 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.

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 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 19
3,195 is electrically connected to the drive motor 105 provided on the movable body 87, and
The driving range of 7 is restricted. That is, when the pair of movable bodies 87 move toward each other, they are stopped by actuating the first limit switch 193, and when the pair of movable bodies 87 move toward each other, the second limit switch 193 is stopped.
It is stopped by operating the limit switch 195.

Next, the operation of manufacturing a spring using the first molding device will be explained. First, when the start switch (not shown) on the operation panel is turned on, the ejecting cylinder 19 is operated and the wire 27 is removed from the collecting section 5.
Send out one. This wire rod 27 is connected to the delivery plate 11
The upper part of the ring rolls into contact with the first and second stoppers 31 and 33. Next, after the positioning cylinder 43 is operated to position the wire rod 27 along the longitudinal direction of the main body 1, the drive cylinder 73 of the gripping arm 61 is operated and the hook 77 is moved to the intermediate portion of the wire rod 27. is held. Then, the first rotating cylinder 53 operates to rotate the rotating plate 51 by 90 degrees, and the center pin 5 provided on the rotating plate 51
7 and the bearing 59 form bent portions 27a at both ends of the wire 27. Bent parts 27a are formed at both ends of the wire rod 27, and when the movable plate 37 is driven by the operation of the drive cylinder 39, the second rotation cylinder 67 is operated and the gripping arm 61 is almost moved.
The wire rod 27 is rotated 270 degrees and both ends of the wire rod 27 are inserted between a pair of holding rollers 135 provided on each movable body 87. 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. Further, when the push-up cylinder 143 is operated to hold both ends of the wire rod 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 surface of the front plate 91a of the casing 91 and pushes up the spiral formed in the wire 27. As the movable body 87 travels, the fifth support shaft 185 on which the cam 181 is fitted rotates, so that the cam follower 179 in contact with the cam surface 183 of the cam 181 moves from the bottom dead center to the top dead center. As a result, the ejecting shaft 175 is displaced, and the pitch rod 1
55 stands out. Therefore, after one spiral is formed at both ends of the wire rod 27, the spiral formed one after another as the pair of movable bodies 87 travel is shown in FIG. It will be formed with the pitch P shown. and,
The pair of movable bodies 87 are the first limit switch 1
By activating the spring 93 and stopping its running, the forming of the helical spring portion 27b made of a spiral with a predetermined number of turns is completed. In other words, the wire rod 27 is the 21st
As shown in the figure, the straight part 27c and this straight part 27
The spring 197 is formed into a spring 197 having a spiral spring portion 27b having a continuous upper end at both ends of the spring 197.

When the helical spring portion 27b is formed in this manner, 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 first bent portion 27d is formed which is continuous with the last spiral of b. This first bent portion 27d is used to connect the frame line 199 with a clip 201 as shown in FIG. 24 when the spring 197 is the main spring. In other words, when a spring unit is formed by assembling a large number of springs 197 in a lattice shape with these linear portions 27c, the frame line 1 is attached to the periphery of the spring unit.
99 is provided. In this case, the clip 20 is held in a state where the frame line 199 and the straight portion 27d are in line contact.
Since they are connected by 1, their connection state is certain.

In this way, the straight portion 27c of the spring 197
When the first bent portions 27d are formed at both ends of the
Next, the urging of the lower holding roller 135 by the push-up cylinder 143 is released, the pair of holding rollers 135 are separated, and the operating cylinder 161
is activated and the ejector pin 149 protrudes. Therefore, since the straight portion 27d of the spring 197 is pressed by the ejecting pin 149, 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.

Note that in the first molding device, the horizontal member 8
The first and second limit switches 1 provided in 1
By changing the mounting position of 93, 195, a pair of movable bodies 8
By adjusting the travel range of the spring 197, the straight portion 2 of the spring 197 formed by this first forming device can be adjusted.
The length of 7c can be changed. In other words, the spring 197 can be formed not only as a main spring but also as an intermediate support spring.

If the spring 197 molded by the first molding device is an intermediate support spring, the spring 197 dropped onto the front side of the main body 1 by the ejector pin 149 is transferred to the second molding device. . This second molding device includes a base body 231 as shown in FIGS. 25 and 26.
A pair of walls 233 having a substantially inverted U-shaped cross section are erected on the upper surface of the base body 231 and spaced apart from each other at a predetermined interval over the entire length in the longitudinal direction. These walls 2
A plurality of mounting shafts 237 are provided between the inner walls 235 of 33.
is rotatably supported by a bearing 239. Inner wall 235 and outer wall 24 of each mounting shaft 237
A sprocket 243 is fitted to each end portion located between the sprocket 1 and the sprocket 1. Endless conveyor chains 245 are stretched between sprockets 243 at both ends of each mounting shaft 237, respectively.
Each plate of this chain 245 has a tongue piece 247.
is installed protrudingly. Further, a receiving plate 249 is provided at one longitudinal end of the base body 231 so as to be inclined low toward the chain 245 . This receiving plate 2
At 49, the spring 197 molded by the first molding device is dropped. In other words,
The straight portion 27c of the spring 197 is connected to the receiving plate 2.
Received by 49. Further, an intermediate sprocket 251 is fitted into the center of the mounting shaft 237 located on the other end side of the base 231. The base body 231 corresponding to this intermediate sprocket 251
As shown in FIG. 27, a drive sprocket 253 is fitted onto a support shaft 255 which is rotatably supported by the base body 231 on the lower surface thereof. A drive chain 254 is stretched between this drive sprocket 253 and the intermediate sprocket 251. The drive sprocket 253 is a drive rotary cylinder 25.
7 intermittently rotates by a predetermined angle. That is, a drive plate 261 is fitted onto the rod 259 of the drive rotation cylinder 257 so as to be spaced apart from and face the drive sprocket 253. A mounting member 263 shown in FIGS. 28 and 29 is fixed to the plate surface of this drive plate 261. One end of this mounting member 263 is carved with a regulation groove 265 that is open on one side and one end surface, and this regulation groove 265
A locking rod 267 is rotatably supported at one end by a pin 269. The other end of the locking rod 267 projects radially outward from the regulating groove 265, and a tension spring 271 for biasing the locking rod 267 is tensioned between the other end and the mounting member 263. has been done. Furthermore, the driving sprocket 25
A pair of pins 273 are provided on the plate surface of No. 3 so as to protrude from each other by 180 degrees in the circumferential direction. Then, when the driving rotary cylinder 257 is operated and the rod 259 is rotated by a predetermined angle, for example, about 240 degrees in the direction of the arrow, and the driving plate 261 is interlocked with this rotation, the locking rod 267 is moved from one pin 269. to rotate the drive sprocket 253. When the drive plate 261 returns after rotating a predetermined angle, the locking rod 26
7 hits the other pin 269, but since the locking rod 267 rotates at this time, the drive plate 261 does not rotate. That is, since the drive plate 261 is intermittently rotated in one direction by a predetermined angle by the locking rod 267, the conveyance chain 245 moves endlessly in conjunction with this rotation. Therefore, the spring 197 supplied to the receiving plate 249
is transported with its straight portion 27c engaged with the tongue piece 247 of the transport chain 245.

On the other hand, the base body 231 is sequentially provided with a hardened portion 275, a coating portion 277, and a bent portion 279 along the direction of conveyance of the spring 197. The hardened portion 275 is shown in FIGS.
It is formed as shown in Figure 2. That is, a pair of horizontal rods 281 are installed on the upper surface of the base body 231 above the conveyance chain 245 along the width direction of the base body 231 . Horizontal cylinders 283 are disposed at both ends of the horizontal rod 281, with their rods 285 being horizontal. An upper conductor 287 is attached to this rod 285. This upper conductor 287 has a three-layer structure in which an upper current-carrying plate 291 is bonded to the lower surface of an insulating material 289, and a guide plate 293 is bonded to the upper surface.
3 are slidably inserted into guide grooves 294 formed in the horizontal rod 281. The upper conductor 287 is normally located above the wall 233, and when the horizontal cylinder 283 is operated and its rod 285 is retreated, the upper conductor 287 is connected to the wall 233.
Located above the outer surface of. In addition, a vertical cylinder 295 is located below the outer surface of the wall 233 and the rod 2 is connected to the vertical cylinder 295.
97 is arranged vertically. This rod 2
A lower conductor 299 is attached to 97 . The lower conductor 299 has a mounting body 301 fixed to the rod 297, and a lower current-carrying plate 305 bonded to the upper surface of the mounting body 301 via an insulating material 303. Further, the upper current-carrying plate 291 and the lower current-carrying plate 305 are connected to a power source (not shown). Furthermore, an insulating plate 307 is bonded to the outer surface of the outer wall 241 in the hardened portion 275 . Then, when the spring 197 is conveyed to the hardening section 275, the horizontal cylinder 283 and the vertical cylinder 295 are operated, and the helical spring section 275 of the spring 197 is activated.
The upper and lower end surfaces of 7b are held between the upper conductor 287 and the lower conductor 299. Therefore,
A current flows through the helical spring portion 27b to heat it.

The spring 197 heated in the hardening section 275 is conveyed to the coating section 277. This coating portion 277 is constructed as shown in FIGS. 33 to 35. In other words, a bottomed container 309 with an open upper surface is provided below the outside of the wall 233.
is installed. This container 309 contains powder 311 of synthetic resin such as polyethylene. Further, a cylinder 313 having an opening 312 formed in the lower end peripheral wall is provided upright within the container 309, and a screw shaft 314 is accommodated in the cylinder 313. The lower end of this screw shaft 314 protrudes from the bottom of the container 309 and bears a bearing 315.
It is rotatably supported by a driven pulley 317 at its end. Near this driven pulley 317 is a motor 321 with a rotating shaft 319 parallel to the screw shaft 314.
is installed. Rotating shaft 3 of this motor 321
A drive pulley 323 is fitted to the drive pulley 19, and a belt 325 is stretched between the pair of pulleys 317 and 323. Therefore, when the screw shaft 314 is rotationally driven by the motor 321, the cylindrical body 3
Powder 3 flowing into the inside from the opening 312 of 13
11 is pushed upward by the screw shaft 314 and flies upward from the upper end opening of the cylindrical body 313. Therefore, the powder 311 is welded to the heated helical spring portion 27b of the spring 197 passing above the cylinder 313. Further, above the wall body 233 of the coating portion 277, the base body 231
A bracket 327 is provided with one end secured to. A screw shaft 329 is provided on the bracket 327 so as to be movable up and down, and a mounting body 331 is elastically attached to the screw shaft 329 via a spring 333. One end of the mounting body 331 is pivotally connected to the base body 231 with a pin 335, and a mounting shaft 337 is provided rotatably and horizontally by a bearing 338. Push rollers 339 are fitted to both ends of the mounting shaft 337, and the push rollers 339 press the conveyance chain 245 to curve it downward. Therefore, the spring 1 conveyed by the conveyance chain 245
97 reaches the coating portion 277, the above-mentioned push roller 339 is moved along with the conveyance chain 245.
is displaced downward by. Therefore, since the lower end of the helical spring portion 27b of the spring 197 approaches the upper end opening of the cylinder 313, the powder 311 is easily welded to the lower end of the helical spring portion 27b. Note that the push roller 3 of the wall body 233
A recess 341 is formed in a portion corresponding to 39,
This recess 341 allows the spring 197 to be displaced downward together with the conveyance chain 245. That is, by welding the powder 311 to the lower end of the helical spring portion 27b of the spring 197, when a spring unit is formed using this spring 197, the squeak of the helical spring portion 27b can be reduced and the helical spring portion 27b When fixing to the base of the spring unit with a tack, the fixation can be performed reliably.

In this way, the spring 197 that has passed through the coating portion 277 reaches the bent portion 279. This bent portion 279 is shown in FIGS. 36 to 39.
It is formed as shown in the figure. In other words, wall 2
A pair of side push-up cylinders 343 are vertically disposed at the outer lower part of the wall body 33 , and a center push-up cylinder 345 is vertically disposed between the pair of wall bodies 233 . Above side push-up cylinder 3
43 rod 347 has a flat plate-shaped first support body 3.
49 is fixed. In addition, the rod 351 of the central push-up cylinder 345 has a Y-shaped receiving portion 3.
A second support 355 with 53 is fixed. The pair of first supports 349 are connected to the springs 1 conveyed by the conveyance chain 245.
97, the second support body 355 faces the lower end of the helical spring portion 27b, and the second support body 355 faces the straight portion 27d. Therefore, when each cylinder 343, 345 operates,
The spring 197 floats from the conveyance chain 245 with the helical spring portion 27b and straight portion 27d supported by the first and second support bodies 355. Additionally, a mounting body 35 is provided above each splinder 343, 345.
7 is disposed, and a pair of rotating cylinders 359 for bending are provided on this mounting body 357 with rods 361 facing downward. A rotating body 363 is fixed to the rod 361 of each cylinder 359. This rotating body 363 has a pin 365 near its center of rotation.
is provided protrudingly, and a roller 3 is provided near this pin 365.
67 is rotatably provided and spaced apart from the pin 365 by a predetermined distance. Then, the side push-up cylinder 343 and the center push-up cylinder 34
When the spring 197 is floated by the pin 365, both ends of the straight portion 27d of the spring 197
and roller 367. In addition, the mounting body 357 has the linear portion 27
A presser body 369 is provided on one side of both ends in opposite directions when the ends of d are engaged with the pin 365 and the roller 367. The bending rotary cylinder 359 operates after the side push-up cylinders 343 and the center push-up cylinder 345 operate, and rotates the rod 361 by a predetermined angle in the direction shown by the arrow in FIG. Therefore, the straight portion 27d of the spring 197 has first bent portions 27d at both ends as shown in FIG.
A second bent portion 27e continuous to the second bent portion 27e is formed parallel to the second bent portion 27e. When the main spring and the intermediate support spring form a spring unit, the first and second bent portions 27e are in line contact with the linear portions 27c of the main spring arranged in a lattice shape, and this contact portion are connected by clips 371.

Next, the operation of the second molding device will be explained. When the spring 197 formed by the first forming device is supplied to the receiving plate 249 of the second forming device, this spring 197 is attached to the straight rod portion 197.
is engaged with the tongue piece 247 of the conveyance chain 245 and conveyed. When the spring 197 conveyed by the conveyance chain 245 reaches the hardened part 275, the horizontal cylinder 283 is activated and the upper conductor 287 moves to the helical spring part 27 as shown in FIG.
facing the upper end of b. Next, the vertical cylinder 29
5 is activated and the lower conductor 299 rises. Therefore, the spring 197 is pushed up and its straight portion 197 floats up from the conveyance chain 245, and the helical spring portion 27b is attached to the pair of conductors 2.
87,299. Therefore, current flows through the helical spring portion 27b, so the helical spring portion 2
7b is heated and hardened.

When such hardening is carried out for a predetermined period of time, the horizontal cylinder 283 and the vertical cylinder 295 are returned to their original positions, and the spring 197 is applied to the conveyor chain 245.
transported again by And spring 1
When the powder 97 passes through the coating portion 277, the powder 311 thrown up from the upper end opening of the cylindrical body 313 by the screw shaft 314 is welded to the lower end portion of the helical spring portion 27b heated in the quenching portion 275. Therefore, the lower end of the helical spring portion 27b is coated with the powder 311.

Spring 1 passing through coating part 277
When the spring 97 reaches the bending portion 279, the pair of side push-up cylinders 343 and the center push-up cylinder 345 operate to raise the spring 197. Then, the straight part 2 of this spring 197
Both ends of 7c are connected to pins 36 of a rotary body 363 fixed to a rod 361 of a rotary bending cylinder 359.
5 and roller 367, respectively. Next, the bending rotation cylinder 359 is operated to rotate the rod 361 by a predetermined angle. Accordingly, second bent portions 27e are formed at both ends of the straight portion 27c so as to be continuous with the first bent portions 27d formed by the first forming device.

In this way, the straight portion 27 of the spring 197
When the second bent portions are formed at both ends of the ac, the side push-up cylinders 343 and the center push-up cylinder 345 are returned to their original positions, and the spring 197 is carried out from the second forming device by the conveyance chain 245. Further, the bending rotary cylinder 359 also returns to its original position.

The present invention is not limited to the above embodiment, and the forming roller 153 in the first forming apparatus may be provided as shown in FIGS. 41 and 42. That is, a guide groove 205 is formed along the width direction in the front plate 91a of the upper housing 91 of the movable body 87, and the support body 207 is slidably provided in the guide groove 205. A mounting shaft 209 is provided to pass through this support body 207 in the front-rear direction. A forming roller 153 is fitted to one end of the mounting shaft 209 protruding toward the front side, and a cam follower 211 is fitted to the other end located inside the upper housing 91. 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 a tension spring 21
7 in the direction of the arrow, this holding body 207
The cam follower 211 provided in the cam 21
Furthermore, a pulley 219 having the same number of teeth is fitted to the other end of the sixth support shaft 213 and the fifth support shaft 185, which are in pressure contact with the outer peripheral surface of the fifth support shaft 185. 211 is installed.

According to such a configuration, when the movable body 87 travels to form the spring 197 and the fifth support shaft 185 rotates, the sixth support shaft 213 also rotates. When the sixth support shaft 213 rotates, the support body 207 provided with the cam follower 211 slides along the guide groove 205 according to the shape of the cam 215 fitted on the support shaft 213. Therefore, the forming roller 1 provided on the support body 207
53 and the rod 16 of the third rotating cylinder 165
Since the distance from the guide body 151 provided at the wire rod 7 changes, the diameter of the spiral formed at both ends of the wire rod 27 can be changed.

That is, in response to the rotation of the sixth shaft 213, 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 changed to the fourth
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. 45, and if it is changed in the state shown in B, it becomes a conical shape as shown in FIG. 46. 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.

As described above, according to the present invention, it is possible to mass-produce a spring in which a straight portion and spiral spring portions are continuously formed at both ends of the straight portion using a single wire rod. Moreover, a first bent part and a second bent part can be formed at both ends of the straight part of the spring. Therefore, when this spring is connected to another spring, the first and second bent portions can be connected in line contact with the straight portion of the other spring, thereby making the connection stronger. be able to.

[Brief explanation of the drawing]

1 to 40 show an embodiment of the present invention, in which FIG. 1 is a front view of the first molding device, FIG. 2 is a plan view of the same, FIG. The figure is also a side view, Figure 5 is a plan view of the part forming the bent portion at both ends of the wire sent out from the above-mentioned accumulation section, Figure 6 is a side view along the line of Figure 5, and Figure 7 is a sectional view taken along the line in Figure 5, Figure 8 is a plan view of the gripping arm, Figure 9 is also a side view, and Figure 1 is a side view.
Figure 0 is a front view of the movable body, Figure 11 is Figure 10
12 is a sectional view of the mounting structure of the fourth support shaft, FIG. 13 is a plan view of the movable body,
Figure 4 is a plan view of the ejector pin mounting structure, No. 15
The figure is a sectional view of the mounting structure between the forming roller and the guide body, FIG. 16 is a sectional view taken along the line of FIG. 15, FIG. 17 is a plan view of the mounting structure of the pitch rod, and FIG. A sectional view along the line, FIG. 19 is an enlarged view of the upper front surface of the movable body, and FIG. 20 is a plan view of the wire with a bent part formed at the end.
FIG. 21 is a perspective view of the wire rod formed into a spring, FIG. 22 is a plan view thereof, FIG. 23 is a perspective view of the spring with bent portions formed at both ends of the straight portion, and FIG. 24 25 is a plan view of the second molding device, FIG. 26 is a side view of the second molding device, FIG. 27 is a front view of the mechanism that drives the conveyance chain of the second molding device, and FIG. The figure is a front view of the drive plate constituting this drive mechanism, FIG. 29 is an exploded perspective view of the mounting member and the latch, FIG. 30 is a plan view of the hardened part, FIG. 31 is a side view, and
Figure 2 is a side view of the operating state, Figure 33 is a plan view of the coating section, Figure 34 is a side view of the coating part,
FIG. 35 is a longitudinal sectional view, FIG. 36 is a longitudinal sectional view of the bending section, FIG. 37 is a plan view of a pair of rotating bodies constituting the bending section, and FIG. 38 is a side view of the central cylinder. FIG. 39 is a side view of the side cylinder, FIG. 40 is a plan view of the state in which the main spring and intermediate support spring are connected, and FIG. 41 is a molding device of the first molding device showing another embodiment of the present invention. A plan view of the roller mounting structure, FIG. 42 is a front view, FIG. 43 is an explanatory diagram showing various changes in the distance between the forming roller and the guide body as the cam rotates, and FIGS. 44 to 46. FIG. 2 is a perspective view of a spring formed by changing the above-mentioned spacing. 27... Wire rod, 27b... Spiral spring part, 27c
...Straight section, 27d...First bent section, 27e...
...Second bending part, 83...Guide rail, 135
...Holding roller (holding mechanism), 151 ... Guide body, 153 ... Forming roller, 155 ... Pitch rod, 165 ... Third rotating cylinder (first drive mechanism), 197 ... Spring, 245 ...Transportation chain (transportation mechanism), 363...Rotating body,
365... Pin (engaging part), 367... Roller (engaging part), 359... Rotating cylinder for bending (second
drive mechanism).

Claims (1)

[Claims] 1 A first molding device for molding a helical spring portion, and a second molding device to which a spring having a helical spring portion and a first bent portion formed by the first molding device is supplied. In the spring manufacturing device, the first forming device includes a guide rail provided substantially horizontally along the width direction of the first forming device, and a guide rail provided so as to be movable toward and away from the guide rail. A holding mechanism consisting of a pair of movable bodies, a pair of holding rollers provided on these movable bodies to hold both ends of the wire supplied in a straight line, and A pair of movable bodies are provided so as to be freely movable, and the pair of movable bodies travel in a direction approaching each other, thereby coming into contact with the ends of the wire that are relatively unwound from the holding mechanism, and bending both ends of the wire into a spiral shape. a forming roller, and an insertion groove provided between the forming roller and the holding mechanism into which the end of the wire is slidably inserted and held; a guide body that determines the diameter of the helix to be formed; a pitch rod that is provided between the guide body and the forming roller to determine the pitch of the helix formed by the guide body and the forming roller; and both ends of the wire rod. When the spiral spring part has been formed, the guide body is rotated by a predetermined angle to form first bent parts at both ends of the straight part of the wire rod that continues to the last formed spiral of the spring part. The second forming device includes a transport mechanism that transports the spring supplied here, and a transport mechanism that transports the springs at both ends of the straight portion of the spring that is transported by the transport mechanism. A pair of rotating bodies arranged at corresponding positions, an engaging part provided on these rotating bodies and engaging with both ends of the linear part, and both ends of the linear part engaged with the engaging part. a second bent portion that is actuated to rotate the rotating body by a predetermined angle and forms a second bent portion continuous to the first bent portion at both ends of the straight portion by the engaging portion; 1. A spring manufacturing device comprising: a drive mechanism;