JP2011110564A - Device for manufacturing coil spring and method for manufacturing coil spring - Google Patents

Abstract

The position of the first and second molding tools can be controlled by simple arithmetic processing, and the positions of the first and second molding tools can be easily adjusted by manual operation. A coil spring manufacturing apparatus and a coil spring manufacturing method are provided.
In a coil spring manufacturing apparatus according to the present invention, first and second slide drive shafts for driving first and second forming tools 21 and 22 can be moved up and down by a third slide drive shaft. The intersection of the first and second collision reference lines V1 and V2 extending from the first and second collision points 21P and 22P is defined as an origin 10P, and the first collision from the origin 10P to the first collision point 21P. Position control is performed so that the total distance L1, the second collision distance L2 to the second collision point 22P, and the supply start point distance L3 obtained by adding the radius of the wire 90 to the distance to the wire rod supply start point 12P are the same. Is going.
[Selection] Figure 2

Description

  The present invention relates to a coil spring manufacturing apparatus and a coil spring manufacturing method for forming a coil spring from a wire by sequentially abutting a wire supplied in a horizontal direction from a wire guide with a first and a second forming tool.

  Conventionally, as a coil spring manufacturing apparatus of this type, a vertical drive shaft and a horizontal drive shaft for moving the first and second forming tools to arbitrary positions in the vertical and horizontal directions with respect to the wire rod guide, There is known one that is provided separately for each of the two molding tools and includes a total of four molding tool drive shafts (see, for example, Patent Document 1).

JP-A-11-197775 (FIGS. 5, 6, 10A to 10E)

  By the way, the wire supply start point, which is the center point of the end exit of the wire guide, the first contact point, which is the contact point between the first forming tool and the wire, and the second contact point, which is the contact point between the second forming tool and the wire material. A congruent point has a certain relationship described below. That is, assuming that the portion from the wire supply start point to the first and second abutting points of the coil spring has an arc shape with a uniform diameter, from the center point of the arc to the first and second abutting points. Each distance has a theoretical relationship that the distance obtained by adding the radius of the wire to the distance from the center point to the wire supply start point is the same. However, in order to control the position of the wire supply starting point and the first and second abutting points at a position satisfying such a theoretical relationship, a conventional coil spring having the above four forming tool drive shafts is manufactured. In the apparatus, there is a problem that complicated calculation processing is necessary, and when adjustment is performed in consideration of springback or the like, the degree of freedom of adjustment is too high, and adjustment by manual operation requires skill.

  The present invention has been made in view of the above circumstances. The first and second molding tools can be position-controlled by simple arithmetic processing, and the first and second molding tools can be manually operated. An object of the present invention is to provide a coil spring manufacturing apparatus and a coil spring manufacturing method capable of easily adjusting the position of the coil spring.

  The coil spring manufacturing apparatus according to the invention of claim 1 made to achieve the above object includes a wire guide having a guide hole for guiding the wire in the horizontal direction, and extends downward at an angle of 45 degrees on the front side with respect to the wire guide. A first slide drive shaft for positioning the first molding tool at an arbitrary position along the first guide rail, and a second molding tool along the second guide rail extending obliquely upward 45 degrees forward with respect to the wire guide. And a second slide drive shaft for positioning the wire spring at an arbitrary position, and a coil spring manufacturing apparatus for forming a coil spring from the wire by bringing the first forming tool and the second forming tool into contact with the wire fed from the wire guide A third slide drive shaft capable of positioning the movable base at an arbitrary position along the third guide rail extending in the vertical direction, and the first guide rail and the second guide rail. Is mounted on the movable base, and the first abutting reference line extending in the guide direction of the first guide rail from the first abutting point where the wire abuts among the first forming tools and the wire among the second forming tools The intersection of the second abutting reference line extending in the guiding direction of the second guide rail from the mating second abutting point includes the wire supply start point that is the center point of the guide hole outlet and is perpendicular to the axis of the guide hole The first collision distance from the origin to the first collision point, the second collision distance from the origin to the second collision point, and the distance from the origin to the wire supply start point It has a feature in that it includes slide control means for controlling the first slide drive shaft, the second slide drive shaft, and the third slide drive shaft so that the supply starting point distance obtained by adding the radius of the wire to each other becomes the same. .

  According to a second aspect of the present invention, in the coil spring manufacturing apparatus according to the first aspect, there is provided an introduction data setting means for setting the coil diameter of the coil spring and the wire diameter of the wire, and is set by the introduction data setting means. When the coil diameter is D and the wire diameter is d, the slide control means moves the first collision position to the command position where the first collision distance, the second collision distance, and the supply starting point distance are all (D + d) / 2. It is characterized in that the first slide drive shaft, the second slide drive shaft, and the third slide drive shaft are controlled so that the meeting point, the second meeting point, and the wire supply start point are arranged.

  According to a third aspect of the present invention, in the coil spring manufacturing apparatus according to the second aspect, the coil spring manufacturing apparatus can be switched between an automatic drive mode and a manual drive mode. The slide control means controls the first slide drive shaft, the second slide drive shaft, and the third slide drive shaft so that the joining point and the wire supply start point are arranged at the command position. In the manual drive mode, the first slide drive is performed. The shaft, the second slide drive shaft, and the third slide drive shaft can be individually operated.

  According to a fourth aspect of the present invention, there is provided the coil spring manufacturing apparatus according to the third aspect, wherein a cutting stand-by tool that is fixed above or below the wire guide and is disposed inside the coil spring, and usually a cutting stand-by tool. A cutting movable tool that is arranged above or below the wire rod guide and moves directly to the wire rod guide side when cutting the coil spring and cuts the coil spring from the subsequent wire rod with the cutting stand-by tool. The cutting stand-by tool and the cutting movable tool are arranged so that the cutting plane of the wire is included in the reference vertical plane.

  A coil spring manufacturing method according to a fifth aspect of the present invention is the coil spring manufacturing method for manufacturing a coil spring using the coil spring manufacturing apparatus according to the fourth aspect, wherein the first and second contact points are set in the automatic drive mode. Then, after positioning the wire supply start point at the command position, the mode is switched to the manual drive mode, and the third slide drive shaft is stopped and operated with the first slide drive shaft or the second slide drive shaft. The position of the first collision point or the second collision point is adjusted so as to be arranged in the reference vertical plane.

  The coil spring manufacturing apparatus according to claim 1 controls the position of the first and second forming tools by the first, second and third slide drive shafts, so that the drive shaft for the forming tool is compared with the conventional one. The number is reduced and the cost is reduced. According to the configuration of the coil spring manufacturing apparatus of the present invention, the first abutting distance from the origin to the first abutting point can be changed only by the first slide drive shaft, and the origin to the second abutting point can be changed. The second collision distance can be changed only by the second slide drive shaft, and the distance from the origin to the wire supply start point can be changed only by the third slide drive shaft. This simplifies the calculation processing of position control in which the first and second molding tools are just brought into contact with the coil springs centered on the origin, and each of the first and second molding tools by manual operation is simplified. Position adjustment is also facilitated. Specifically, the distance obtained by adding the radius of the wire to the distance from the origin to the wire supply start point is the supply start point distance, the coil diameter is D, and the wire diameter is d. The theoretical command position where the first and second forming tools are just brought into contact with the coil spring centered on the origin, and the first collision distance, the second collision distance, and the supply starting point distance are all (D + d) / 2. It can be easily calculated as a position to become.

  The coil spring manufacturing apparatus according to claim 3 is set to the automatic drive mode, and the first contact point, the second contact point, and the wire supply start point are automatically arranged at the command position and then switched to the manual drive mode. By individually operating the slide drive shaft, the second slide drive shaft, and the third slide drive shaft, the actual coil spring can be brought closer to the shape as designed.

  In the coil spring manufacturing apparatus according to the fourth aspect, the cut surface of the wire rod by the cutting stand-by tool and the cutting movable tool is included in the reference vertical plane including the origin (that is, the center point of the coil spring). Therefore, in the automatic drive mode, the first contact point, the second contact point, and the wire supply start point are simply placed at the command position, and the cut surface of the wire can be made substantially perpendicular to the axis of the wire. it can. At this time, if the center of the actual coil spring is deviated from the reference vertical plane, the cut surface of the wire is inclined with respect to the axis of the wire. In such a case, the command positions of the first contact point, the second contact point, and the wire supply start point may be corrected by manual operation so that the actual center of the coil spring is disposed within the reference vertical plane.

  In the coil spring manufacturing method according to claim 5, the first spring contact point, the second contact point, and the wire supply start point are positioned at the command position in the automatic drive mode using the coil spring manufacturing apparatus according to claim 4, and then manually operated. Switch to the drive mode and operate with the first slide drive shaft or the second slide drive shaft in a state where the third slide drive shaft is stopped, so that the center of the coil spring is arranged in the reference vertical plane. Since the position of the collision point or the second collision point is adjusted, the number of axes operated by manual operation is reduced as compared with the conventional coil spring manufacturing apparatus, and adjustment by manual operation becomes possible without requiring skill.

The front view of the coil spring manufacturing apparatus concerning one embodiment of the present invention. Partially enlarged front view of coil spring manufacturing equipment Perspective view of first and second molding tools Conceptual diagram of controller for coil spring manufacturing equipment

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. The coil spring manufacturing apparatus 10 according to the present embodiment includes a wire guide 12 fixed to a vertical main surface 11S of a main base 11 standing vertically from a floor surface of a factory or the like. The wire guide 12 is formed with a guide hole 12 </ b> A extending in parallel and horizontally with the vertical main surface 11 </ b> S of the main base 11. In addition, a pair of feeding rollers 12R and 12R are arranged symmetrically on the upper and lower sides of the rear extension line of the guide hole 12A so as to sandwich the wire 90. Then, the wire rod 90 is fed forward from the wire rod guide 12 by the pair of feed rollers 12R and 12R rotating symmetrically. As shown in FIG. 2, the tip surface 12B of the wire guide 12 is a flat surface, and the center point of the outlet of the guide hole 12A in the tip surface 12B is the wire supply start point 12P according to the present invention. Yes.

  A cutting standby tool 15 is provided above the front end of the wire guide 12. The cutting stand-by tool 15 has a structure in which a cylinder is divided into two vertically and protrudes from the vertical main surface 11S of the main base 11 in the vertical direction. Further, the flat surface 15A corresponding to the divided surface of the cylinder of the cutting standby tool 15 is directed in the horizontal direction opposite to the tip surface 12B of the wire guide 12, and the flat surface 15A of the cutting standby tool 15 and the wire guide. 12 are arranged substantially flush with the front end surface 12B. Further, the cutting standby tool 15 can be moved to a position below the front end portion of the wire guide 12 by a vertical drive mechanism (not shown).

  Cutting movable tools 16 and 16 are provided above and below the cutting standby tool 15, respectively, and are moved up and down by a vertical drive shaft (not shown). Each cutting movable tool 16 has, for example, a prismatic shape extending in the vertical direction, and one side surface thereof is arranged flush with the flat surface 15 </ b> A of the cutting standby tool 15. In a state where the cutting standby tool 15 is disposed above the front end of the wire guide 12, the upper cutting movable tool 16 descends and a part of the coil spring 91 formed around the cutting standby tool 15. Is cut with the cutting stand-by tool 15, and in a state where the cutting stand-by tool 15 is disposed below the front end portion of the wire guide 12, the lower cutting movable tool 16 is lifted, and the cutting stand-by tool A part of the coil spring 91 formed around 15 is cut with the cutting standby tool 15.

  As shown in FIG. 1, a movable base 34 is attached to a side position of the cutting standby tool 15 on the vertical main surface 11 </ b> S of the main base 11. The movable base 34 has a vertically long plate shape parallel to the vertical main surface 11S of the main base 11, and is movable up and down by engaging with a pair of third guide rails 33G and 33G fixed to the vertical main surface 11S. It is supported. In addition, a third ball spiral mechanism 33K is provided between the movable base 34 and the main base 11, and a third servo motor 33M is provided as a drive source in the third ball spiral mechanism 33K. A third slide drive shaft 33 is configured.

  A first guide rail 31G and a second guide rail 32G are mounted on the main mounting surface 34S of the movable base 34 opposite to the main base 11. The first guide rail 31G extends obliquely downward 45 degrees forward with respect to the wire guide 12, and the slider 31S engages with the first guide rail 31G and moves directly in the first guide direction H1. . Further, the first forming tool 21 according to the present invention is fixed to the slider 31S. A first ball spiral mechanism 31K is provided between the slider 31S and the first guide rail 31G, and the first servomotor 31M is provided as a drive source in the first ball spiral mechanism 31K. The first slide drive shaft 31 is configured.

  On the other hand, the second guide rail 32G extends obliquely upward 45 degrees to the front side with respect to the wire guide 12, and the slider 32S engages with the second guide rail 32G and moves in the second guide direction H2. Yes. The second molding tool 22 according to the present invention is fixed to the slider 32S. A second ball spiral mechanism 32K is provided between the slider 32S and the second guide rail 32G, and a second servo motor 32M is provided as a drive source in the second ball spiral mechanism 32K. The second slide drive shaft 32 is configured.

  As shown in FIG. 3, the first molding tool 21 has a prismatic shape, and a first abutting surface 21 </ b> F having a first guide direction H <b> 1 as a normal line is provided at a tip portion thereof. Similarly, the second forming tool 22 has a prismatic shape, and a tip end portion thereof is provided with a second abutting surface 22F having the second guide direction H2 as a normal line. In addition, arc grooves 21M and 22M are formed in the first and second abutting surfaces 21F and 22F, respectively. The arc groove 21M of the first abutting surface 21F extends along the up-and-down inclination direction of the first abutting surface 21F, and the arc-shaped groove 22M of the second abutting surface 22F is inclined up and down of the second abutting surface 22F. It extends along the direction. Then, the linear wire 90 fed from the wire guide 12 is bent upward and slidably contacts the inner surface of the arc groove 21M of the first abutting surface 21F, and then the arc groove 22M of the second abutting surface 22F. The coil spring 91 is formed by sliding in contact with the inner surface and plastically deforming into an arc shape.

  Here, the inner diameters of the arc grooves 21 </ b> M and 22 </ b> M are larger than the outer diameter of the wire 90. Theoretically, the wire 90 is in sliding contact with one point on the bottom surface of the arc grooves 21M and 22M. In this embodiment, as shown in FIG. 2, the theoretical sliding contact with the wire 90 in the arc groove 21M becomes the first contact point 21P according to the present invention, and the theoretical contact with the wire 90 in the arc groove 22M. The upper sliding contact is the second contact point 22P according to the present invention.

  In the present embodiment, the first contact reference line V1 extending in the first guide direction H1 (the guide direction by the first guide rail 31G) from the first contact point 21P and the second guide direction from the second contact point 22P. A reference vertical plane 10K where the intersection with the second abutting reference line V2 extending in H2 (guide direction by the second guide rail 32G) includes the wire supply start point 12P of the wire guide 12 and is perpendicular to the axis of the guide hole 12A Is placed inside. Then, the control described later is performed with the intersection point of the first and second collision reference lines V1, V2 as the origin point 10P.

  FIG. 4 conceptually shows the controller 50 provided in the coil spring manufacturing apparatus 10. The controller 50 includes servo amplifiers 51, 52, 53 corresponding to the first to third servo motors 31M, 32M, 33M. The servo amplifiers 51, 52, 53 are connected to a main control circuit 54 (corresponding to “slide control means” of the present invention), and a console 55 (“introduction data setting means” of the present invention) is connected to the main control circuit 54. ), A storage device 56, a monitor 57, and the like are connected. And using the console 55, the coil diameter of the coil spring 91 manufactured with the coil spring manufacturing apparatus 10 and the wire diameter of the wire 90 can be input. Further, by operating the console 55, the coil spring manufacturing apparatus 10 can be switched between the automatic drive mode and the manual drive mode.

  In the following description, as shown in FIG. 2, the first collision distance from the origin 10P to the first collision point 21P is L1, and the second collision distance from the origin 10P to the second collision point 22P is L2. The supply start point distance obtained by adding the radius of the wire 90 to the distance from the origin 10P to the wire supply start point 12P is appropriately referred to as L3, the coil diameter D, and the wire diameter d. The position where the intersection of the first and second collision reference lines V1 and V2 and the first collision point 21P coincide with each other is called the zero point of the first collision point 21P. The position at which the intersection of the two collision reference lines V1 and V2 and the second collision point 22P coincide with each other is called the zero point of the second collision point 22P, and the first and second collision reference lines V1 and V2 The position at which the intersection of the wire and the wire supply start point 12P coincides is referred to as the 0 point of the wire supply start point 12P.

  When the coil spring manufacturing apparatus 10 is set to the automatic drive mode, the main control circuit 54 uses the position command for the first servo motor 31M to place the first abutting point 21P at a position separated from the 0 point by (D + d) / 2. Generating data, generating position command data for the second servomotor 32M for disposing the second abutting point 22P at a position separated from the 0 point by (D + d) / 2, and further, generating the first and second Position command data for the third servomotor 33M for arranging the intersection of the collision reference lines V1 and V2 at a position separated by D / 2 from the wire supply start point 12P is generated. When the first to third servo motors 31M, 32M, and 33M are driven based on these position command data, the first collision distance L1, the second collision distance L2, and the supply starting point distance L3 are all ( The positioning of the first molding tool 21, the second molding tool 22, and the movable base 34 is controlled so that D + d) / 2. Thereby, the 1st and 2nd shaping | molding tools 21 and 22 can just be made to contact the coil spring 91 centering on the origin 10P.

  When the coil spring manufacturing apparatus 10 is switched to the manual drive mode, the first slide drive shaft 31, the second slide drive shaft 32, and the third slide drive shaft 33 are individually operated by three manual operation switches provided in the console 55. It becomes possible.

  The description regarding the structure of the coil spring manufacturing apparatus 10 of this embodiment is above. The coil spring manufacturing apparatus 10 of the present embodiment controls the position of the first and second forming tools 21 and 22 with the first, second and third slide drive shafts 31, 32 and 33. Compared to the above, the number of drive shafts for the molding tool is reduced, thereby reducing the cost. Further, according to the configuration of the coil spring manufacturing apparatus 10 of the present embodiment, the first abutting distance L1 from the origin 10P to the first abutting point 21P can be changed only by the first slide drive shaft 31, and the origin 10P. The second abutting distance L2 from the first abutting point 22P to the second abutting point 22P can be changed only by the second slide drive shaft 32, and the distance from the origin 10P to the wire rod supply start point 12P can be changed only by the third slide driving shaft 33. Can be changed. This simplifies the calculation processing of position control in which the first and second forming tools 21 and 22 are just brought into contact with the coil spring 91 centered on the origin 10P, and the first and second manual operations are performed. Adjustment of the position for each molding tool 21, 22 is also facilitated. Specifically, a first abutting point 21P, a second abutting point 22P, and a wire supply start point 12P for bringing the first and second forming tools 21 and 22 into contact with the coil spring 91 centered on the origin 10P. The command position can be easily calculated as a position where the first collision distance L1, the second collision distance L2, and the supply starting point distance L3 are all (D + d) / 2.

  Moreover, in the coil spring manufacturing apparatus 10 of this embodiment, the reference | standard perpendicular | vertical in which the cutting | disconnection surface of the wire 90 by the cutting stand-by tool 15 and the cutting movable tool 16 contains the above-mentioned origin 10P (namely, center point of a coil spring) is included. Since the first contact point 21P, the second contact point 22P, and the wire supply start point 12P are disposed at the command position in the automatic drive mode, the cut surface of the coil spring 91 is changed to the wire 90. It can be in a state of being substantially orthogonal to the axis.

  Furthermore, in the coil spring manufacturing apparatus 10 of the present embodiment, the automatic drive mode is set, and the first drive point 21P, the second contact point 22P, and the wire supply start point 12P are automatically arranged at the command position, and then the manual drive mode. By switching to, and individually operating the first to third slide drive shafts 31, 32, and 33, the actual coil spring 91 can be made closer to the shape as designed.

  Specifically, if the center of the actual coil spring 91 is deviated from the reference vertical plane 10K, or if the actual coil diameter of the coil spring 91 is different from the designed coil diameter due to springback, the first to first By individually operating the third slide drive shafts 31, 32, and 33, the first abutting point 21P, the second abutting point 22P, and the wire rod supply starting point 12P are set so that the actual coil spring 91 approaches the shape as designed. The command position may be corrected and the corrected command position data may be stored in the storage device 56. Then, by operating the coil spring manufacturing apparatus 10 using the command position data stored in the storage device 56 by the teaching playback method, the actual coil spring 91 can be brought closer to the shape as designed. it can. Further, in the adjustment work for correcting the command position, since the number of forming tool drive shafts to be operated is smaller than that of the conventional coil spring manufacturing apparatus, it can be easily adjusted without requiring skill. .

  Further, the cutting standby tool 15 is moved below the wire guide 12, and the wire 90 supplied from the wire guide 12 is abutted in the order of the second forming tool 22 and the first forming tool 21 to form the coil spring 91. You can also

  In addition, this invention is not limited to the said embodiment, In the range which does not deviate from a summary other than the above, it can change and implement variously.

DESCRIPTION OF SYMBOLS 10 Coil spring manufacturing apparatus 10K Reference | standard vertical surface 10P Origin 12 Wire rod guide 12A Guide hole 12B Tip surface 12P Wire rod supply starting point 15 Cutting stand-by tool 16 Cutting movable tool 21 First forming tool 21F First abutting surface 21P First abutting point 22 Second forming tool 22F Second abutting surface 22P Second abutting point 31 First slide drive shaft 31G First guide rail 32 Second slide drive shaft 32G Second guide rail 33 Third slide drive shaft 33G Third guide rail 34 Movable Base 54 Main control circuit (slide control means)
55 Console (Introduction data setting means)
56 Storage Device 90 Wire Material 91 Coil Spring L1 First Contact Distance L2 Second Contact Distance L3 Supply Start Point Distance V1 First Contact Reference Line V2 Second Contact Reference Line

Claims (5)

A first positioning tool is positioned at an arbitrary position along a wire guide having a guide hole for guiding the wire in a horizontal direction and a first guide rail extending obliquely downward 45 degrees forward with respect to the wire guide. A slide drive shaft, and a second slide drive shaft for positioning the second molding tool at an arbitrary position along a second guide rail extending obliquely forward 45 degrees forward with respect to the wire guide, from the wire guide In the coil spring manufacturing apparatus for forming a coil spring from the wire by bringing the first forming tool and the second forming tool into contact with the fed wire,
Providing a third slide drive shaft capable of positioning the movable base at an arbitrary position along the third guide rail extending in the vertical direction, and mounting the first guide rail and the second guide rail on the movable base;
The first abutting reference line extending in the guide direction of the first guide rail from the first abutting point where the wire rod abuts in the first forming tool and the wire abutting out of the second forming tool. An intersection with a second abutting reference line extending from the second abutting point in the guide direction of the second guide rail includes a wire supply start point that is a center point of the outlet of the guide hole and is in the axis of the guide hole Place it in the vertical reference vertical plane as the origin,
The radius of the wire is set to a first collision distance from the origin to the first collision point, a second collision distance from the origin to the second collision point, and a distance from the origin to the wire supply start point. A coil spring comprising slide control means for controlling the first slide drive shaft, the second slide drive shaft, and the third slide drive shaft so that the added supply starting point distances are the same. Manufacturing equipment.   Introducing the data diameter setting means for setting the coil diameter of the coil spring and the wire diameter of the wire, when the coil diameter set in the introduction data setting means is D, and the wire diameter is d, The slide control means includes the first contact point, the second contact point, and the wire rod at command positions where the first contact distance, the second contact distance, and the supply starting point distance are all (D + d) / 2. The coil spring manufacturing apparatus according to claim 1, wherein the first slide drive shaft, the second slide drive shaft, and the third slide drive shaft are controlled so that a supply start point is arranged.   The coil spring manufacturing apparatus can be switched between an automatic drive mode and a manual drive mode, and in the automatic drive mode, the first contact point, the second contact point, and the wire supply start point are arranged at the command position. The slide control means controls the first slide drive shaft, the second slide drive shaft, and the third slide drive shaft, and in the manual drive mode, the first slide drive shaft and the second slide drive shaft. The coil spring manufacturing apparatus according to claim 2, wherein the third slide drive shaft can be individually operated.   A cutting stand-by tool fixed above or below the wire guide and arranged inside the coil spring, and usually arranged above or below the wire guide from the cutting stand-by tool, A cutting movable tool that linearly moves toward the wire guide side when cutting the coil spring and cuts the coil spring from the subsequent wire with the cutting stand-by tool, and the cutting surface of the wire is the The coil spring manufacturing apparatus according to claim 3, wherein the cutting standby tool and the cutting movable tool are disposed so as to be included in a reference vertical plane.   5. The coil spring manufacturing method for manufacturing a coil spring using the coil spring manufacturing apparatus according to claim 4, wherein the first contact point, the second contact point, and the wire supply start point are set to the command position in the automatic drive mode. After the positioning, the mode is switched to the manual drive mode, and the third slide drive shaft is stopped and operated with the first slide drive shaft or the second slide drive shaft. A method of manufacturing a coil spring, comprising adjusting a position of the first collision point or the second collision point so as to be disposed in a vertical plane.

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