JPH07236931A - Device for switching operation of pitch tool for coiling machine - Google Patents

Abstract

PURPOSE:To carry out the changeover of operation without detaching a pitch tool by switching, to a specific forward or backward position, a pressing rod with an extruding pitch tool attached. CONSTITUTION:An extruding pitch tool 9A, 9B is attached to the forward end of a pressing rod 11A, 11B, and made movable forwards and backwards in the forming direction of a coil spring S. A switching rod 25A, 25B which are movable forwards and backwards and rotatable is provided with a switching piece 29A, 29B, and a pressing rod 11A, 11B is advanced. A switching lever 21A, 21B is provided in the switching rod 25A, 25B in a state capable of positioning. Pressing lever 32A, 32B is abutted on the switching piece 29A, 29B so as to pressurize the switching rod 25A, 25B. Then, the switching piece 29A, 29B of the switching rod 25A, 25B is positioned by the switching lever 21A, 21B to a position capable or incapable of abutting on the pressing lever 32A, 32B; and thus the pressing rod 11A, 11B with the extruding pitch tool 9A, 9B attached is changed over to a specific forward or backward position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pitch tool operation switching device for a coiling machine, and more specifically, a wedge-shaped pitch tool operation section commonly used for right-handed and left-handed coil springs and a right-handed coil spring. Extruding pitch tool operating part of, and an extruding pitch tool operating part for a left-handed coil spring, each of the pitch tools is independently advanced to the coil forming part of the coil spring, or operated to form the pitch of the coil spring, Alternatively, the wedge-shaped pitch tool and the extrusion pitch tool for the right-handed coil spring or the extrusion pitch tool for the left-handed coil spring are advanced to the coil forming part of the coil spring to operate in cooperation with the formation of the pitch of the coil spring. The present invention relates to a pitch tool operation switching device of a coiling machine for performing the operation.

[0002]

2. Description of the Related Art Conventionally, when a wedge-shaped pitch tool is operated in forming a pitch of a coil spring, a part of an operating mechanism for advancing an extrusion pitch tool for a right-handed coil spring and an extrusion pitch tool for a left-handed coil spring. Or the respective extrusion pitch tool was removed. When operating the extrusion pitch tool for right-handed coil springs or left-handed coil springs, remove a part of the operating mechanism that advances the other extrusion pitch tool that is not activated, or remove the other extrusion pitch tool. While removing the wedge-shaped pitch tool, the operation mechanism for advancing the wedge-shaped pitch tool that is not operated is retracted, or the wedge-shaped pitch tool is removed.

[0003]

As described above, the pitch tool operation switching device for the coiling machine according to the prior art removes a part of each operation mechanism for advancing the pitch tool which is not operated for forming the pitch of the coil spring. Or, since each pitch tool that is not operated has been removed, the removal work for switching the operation is complicated, and it takes a certain amount of time for removal and attachment, and the production efficiency of coil spring forming processing is poor. There was a problem.

Further, since the respective pitch tools which are not operated to form the pitch of the coil spring have been removed, when the removed pitch tools are mounted next time, the mounting position needs to be adjusted, and the coil spring forming process is performed. Had a problem of poor productivity.

The present invention has been made in view of the above problems, and an object thereof is to remove a part of each operating mechanism for advancing a pitch tool which is not operated for pitch formation of a coil spring. It is an object of the present invention to provide a pitch tool operation switching device for a coiling machine that can perform operation switching without removing and removing each pitch tool that is not operated.

[0006]

In order to achieve the above-mentioned object, the pitch tool operation switching device of the coiling machine according to the present invention is capable of advancing and retracting in the coil spring forming direction by attaching the extrusion pitch tool to the front end. A pressing rod and a switching rod that is provided with a switching element that projects orthogonally to the axis and that is capable of advancing and retracting and moving the pressing rod forward; and a switching rod that can be attached to one end of the switching rod to rotate the switching rod. And a switching lever that can be positioned in two in the turning direction,
The servo actuator or the coil spring forming operation mechanism is rotated through a transmission mechanism such as a cam, and the rotation causes the switching rod to come into contact with a protruding switch rod to press the switching rod. The protruding switching element is positioned at a position where it can contact or cannot contact the pressing lever, and the pressing rod to which the extrusion pitch tool is attached is switched to a predetermined forward position or backward position.

Further, two conical holes are bored in the end surface at the same radius and at a right angle position from the shaft center so that one end of the switching rod can rotate with the outer circumference of the switching rod and can move forward and backward together with the switching rod. A sliding cylinder is provided, and the switching lever attached to one end of the switching rod is urged by a spring and a spherical body by a spring at a position having the same radius as the two conical holes of the sliding cylinder from the axis of the switching rod. The conical slanted surface of each conical hole is engageably enclosed, and the switching lever is swung to engage the sphere with one of the two conical holes so that the switching lever is positioned in two swiveling directions. It is a thing.

[0008]

The operation of the present invention constructed as described above will be described as follows.

By the switching lever, the position of the switching element protruding from the switching rod in the turning direction can be brought into contact with or abut against the pressing lever which is turned from the servo actuator or the coil spring forming drive mechanism via a transmission mechanism such as a cam. The pressing rod having the push-out pitch tool attached thereto is switched to a predetermined forward or backward position by positioning the push rod with the switching rod.

Further, in one of two conical holes formed in the end face at the same radius and at the right angle position from the axis of the sliding cylinder,
When the sphere enclosed with the spring is engaged with the switching lever at the same radius as the two conical holes of the sliding cylinder by the turning operation of the switching lever, the sphere is urged by the spring and the cone of the conical hole is conical. The spherical body stays in the conical hole in contact with the inclined surface and acts as two positions in the turning direction of the switching lever.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 7 showing the configuration and FIG. 8 showing the operation. The pitch tool operation switching device for a coiling machine according to the present invention is configured for right-handed coil springs and left-handed coil springs, and has the same configuration and operation other than the disposition position. Symbols indicating the respective parts for the spiral coil springs are suffixed with "A", symbols indicating respective parts for the left spiral coil springs are suffixed with "B", and as a general rule, right spiral coil springs are added. The configuration and operation for use will be described as a representative.

FIG. 1 is a front view showing the whole of the coiling machine. A guide hole is provided between the left end of the front surface of the front plate 2 standing on the machine stand 1 and approximately the central portion, and the wire W is inserted therethrough. And guide the wire guides 4a, 4b, 4b, 4c in a horizontal straight line, and attach the wire guides 4a, ..., 4c by pressing them against each other, and A plurality of pairs of feed rollers 5 and 5 for feeding the wire W, which is rotatable in the tangential direction of the delivery, to the outlet of the line guide 4a to the outlet of the line guide 4c are attached.

In front of the wire guide 4c, there are a first forming tool 6F and a second forming tool 6S capable of advancing and retreating toward the substantial coil center of the coil C which abuts the wire W and forms the coil C having a predetermined curvature. , A D-shaped semi-cylindrical core 7 that can be inscribed in the coil C, and a D-shaped core 7 for cutting the wire W in cooperation with the core 7 by providing a cutting blade at the tip. A cutting tool 6C capable of advancing and retreating toward the outside of the linear portion, and a tip formed in a wedge shape to form a predetermined pitch of a coil spring capable of advancing and retracting toward the axis of the coil C at a position substantially facing the cutting tool 6C. Attach the wedge-shaped pitch tool 8.

Then, near the upper front of the line guide 4c,
Extrusion pitch tool 9A that forms a predetermined pitch of the right-handed coil spring, which can be pressed against the rear surface of the wire W that is being formed into the coil C by the forming tools 6F and 6S.
2 is attached to the advancing / retracting push rod 11A shown in FIG. 2, and the pushing pitch tool 9B for forming a predetermined pitch of the left-handed coil spring is shown in FIG.
Attach to 1B. Note that FIG. 1 shows a configuration for forming a right-handed coil spring, and when forming a left-handed coil spring, the left and right coil springs are formed at symmetrical positions in FIG. 1 with respect to the axes of the line guides 4a, ..., 4c. Extrusion Pitch Tool 9A, 9B
Each element member other than is attached and configured.

Next, in FIG. 2, the push rod 11A for advancing and retracting the push-pitch tool 9A for the right-hand coil spring and the axial center of the push rod 11A for advancing and retracting the push-pitch tool 9B for the left-hand coil spring are attachable and retractable. On the vertical line with the axis of the pressing rod 11B, the pressing rod 11A moves forward and the pushing pitch tool 9A comes into contact with the coil spring S to perform a pressing operation, and the other pressing rod 11B waits at the backward end. It is each longitudinal cross-sectional view showing the inside form, and the front plate 2 and the rear plate 3 are erected on the machine base 1 shown in FIG.
The front plate 2 and the rear plate 3 are connected and locked by a connecting rod (not shown).

The pressing rods 11A and 11B have their front end portions protruding in the vicinity of the tip of the line guide 4c shown in FIG. The pressing rod 11A for the coil spring has a bearing 2a having a front end side press-fitted into the front plate 2 and a rear end side bearing 2a.
a protruding portion engaging with the push-out pitch tool 9A at the front end and a push-out pitch tool 9A. A female screw to be attached is provided, and an extrusion pitch tool 9A is screwed to the front end surface of the pressing rod 11A by a bolt 11a, and the pin hole 11 is located at a position slightly rightward from the central portion.
b and a pin hole 11c at the front position of the rear plate 3 to the right of the pin hole 11b.

The pressing rod 11A has a stepped portion substantially in the center with the front end side having a large diameter, the spring 13A is inserted through the large diameter portion inside the front plate 2, and the small diameter portion of the pressing rod 11A is joined. Fit into one hole 14a formed in 14A to form the joint 1
A retaining ring 1 in which 4A is brought into contact with the stepped portion and a pin hole is formed therein
After fitting 5 into the small-diameter portion, the stop pin 15a is press fit into the pin hole of the stop ring 15 and the pin hole 11b of the pressing rod 11A at a position where the joint 14A can be locked in the axial direction. A retaining ring 16A having a pin hole is fitted in the vicinity of the inside of the rear plate 3 of the pressing rod 11A, and then the retaining pin 1A is inserted.
6a is press-fitted into the pin hole of the retaining ring 16A and the pin hole 11c of the pressing rod 11A so that the retaining ring 16A is brought into contact with the inside of the rear plate 3 when the pressing rod 11A is retracted, and the retracting is performed. Position the ends.

The switching rods 25A, 25B of the operation switching components 20A, 20B are located on the same vertical line as the pressing rods 11A, 11B, and the switching rod 25A for the right-handed coil spring has the front plate 2 on the front end side. A bearing 2b which is press-fitted in and a bearing 3b whose rear end side is press-fitted in a rear plate 3 at a position opposite to the bearing 2b via a sliding cylinder 22A so as to be movable back and forth and rotatable. A pin hole 25a at a position on the left side of the central portion, and a pin hole 25b at a substantially central portion,
A rear end surface shown in FIG. 4 in which an axis connecting the internal thread 25c for screwing the switching lever 21A to the rear end surface and the axis of the internal thread 25c and the axis of the pin hole to be bored is perpendicular to the axis of the pin hole 25a. And a pin hole 25d for positioning the switching lever 21A on the switching rod 25A.

The switching rod 25A has approximately 1 from the front end side.
The first stage of / 4 has a smaller diameter, the second stage of the next approximately 1/4 has a slightly larger diameter than the first stage, and the third stage of the next approximately 1/4 has the second stage. The diameter is made slightly larger than that of the third step, and the next fourth step, which is about 1/4, is formed to have the maximum diameter, which is slightly larger than the third step. At the second step of the switching rod 25A, the other hole 14b bored in the joint 14A is fitted and brought into contact with the second step portion, and the stop ring 17 having a pin hole is fitted in the second step. After doing the fitting 1
4A is axially restrained, and at the position where the switching rod 25A is rotatable, the stop pin 17a is press-fitted into the pin hole of the stop ring 17 and the pin hole 25b of the switching rod 25A so as to be engageable with each other.

At the first stage of the switching rod 25A, a switching ring 28A having a pin hole is fitted and then the switching element 2 is inserted.
9A is press-fitted into the pin hole of the switching ring 28A and the pin hole 25a of the switching rod 25A so as to be engageable. Switching rod 2
In the fourth stage of 5A, a sliding cylinder 22A having a collar 22a formed at the rear end is inserted, and the switching rod 25A is connected to the sliding cylinder 22A.
The lever 22A formed in a rectangular parallelepiped is formed on the rear end surface of the switching rod 25A by the bolt 21a and the female screw 25c shown in FIG. While being screwed, the positioning pin 21b is press-fitted into the pin holes 21c and 25d so that the positioning pin 21b can be engaged with the switching rod 25A and the switching lever 21A. Then, together with the switching rod 25A, the sliding cylinder 22
A can be moved forward and backward to and from the bearing 3b shown in FIG. 2, the switching rod 25A is at the most forward end, and the collar 22a is the locking piece 23A.
It is configured so as not to come into contact with.

The pressing rod 11A for the right-handed coil spring is urged by the spring 13A when the pitch of the right-handed coil spring is formed by interlocking the switching rod 25A with which the pressing rod 11A can move forward and backward by the joint 14A. By a predetermined amount, the extrusion pitch tool 9 is advanced as shown in FIG.
A contacts the rear surface of the right-handed coil spring and presses it to form a predetermined pitch. At the time of retreating without actuating to form the pitch of the right-handed coil spring, the coil 13 is urged by the spring 13A and retreats together with the switching rod 25A. At the time of stand-by in which no operation is performed for pitch formation during the forming process of the left-handed coil spring, the spring 13A is energized to retreat together with the switching rod 25A, and the stop ring 16A waits at the retreat end where it abuts the rear plate 3.

A pressing rod 1 for a left-handed coil spring
1B, the push rod 11B is interlocked with the switching rod 25B that can be moved forward and backward by the joint 14B, and when the pitch of the left-handed coil spring is formed, the push-pitch tool 9B moves forward by a predetermined amount against the bias of the spring 13B. The left-handed coil spring (not shown) is brought into contact with and pressed against the rear surface to form a predetermined pitch. At the time of retreating without making the pitch of the left-handed coil spring act, the spring 13B urges it to retreat together with the switching rod 25B. During the waiting time in which the pitch formation is not performed at the time of forming the right-handed coil spring, the switching rod 25 is biased by the spring 13B.
It retreats together with B, and stands by at the retracted end where the retaining ring 16B abuts the rear plate 3 as shown in FIG.

Next, FIG. 3 (a) is an operation switching component 20A for switching the operation or non-operation of the pushing pitch tool 9A for the right-handed coil spring, and FIG. 3 (b) is the extrusion for the left-handed coil spring. FIG. 4 is a front view of the operation switching component 20B for switching between operation and non-operation of the pitch tool 9B as seen from the rear surface side of the rear plate 3, and FIG. 4 is a longitudinal section of the operation switching component 20A for the right-handed coil spring. FIG. 2 is a plan view showing an operation switching component 2 for a right-handed coil spring
The cutouts 22b, 22 are provided on both outer side surfaces of the sliding cylinder 22A.
b is formed, the sliding cylinder 22A is prevented from rotating, and
The sliding cylinder 22A includes the switching rod 25A and the switching lever 2.
Notch 22 of sliding cylinder 22A that can move forward and backward together with 1A
Betches 22A and 23A on the rear surface of the rear plate 3 shown in FIG. 2 in sliding contact with b and 22b. The detent pieces 23A and 23A are formed into a rectangular parallelepiped and have holes for inserting bolts at both ends. .

The sliding cylinder 22A has a disk-shaped brim 2 formed therein.
2a on the same radius from the axis of the end face, near the outer circumference,
One has a conical hole 22c having a diameter slightly smaller than the diameter of the spherical body 26 at a position on the vertical line passing through the axis of the sliding cylinder 22A and parallel to the cutouts 22b, 22b. A conical hole 22cc having a diameter slightly smaller than the diameter of the sphere 26 is bored at a position on the horizontal line passing through the axis of the cylinder 22A and at a right angle to the notches 22b, 22b. In the switching lever 21A, a spring hole 21e that movably encloses the spring 27 and the sphere 26 is bolted to the surface that contacts the sliding cylinder 22A at the same radius as the conical holes 22c and 22cc from the axis of the bolt hole 21d. The holes are formed in parallel with the holes 21d.

In the switching lever 21A, a spring 27 and a sphere 26 are enclosed in a spring hole 21e, and the sphere 26 is biased by the spring 27 so that it can come into contact with the end face of the flange 22a of the sliding cylinder 22A. A switching lever 21A is fixed to the rear end surface by a bolt 21a and a positioning pin 21b. With the spherical body 26 enclosed in the spring hole 21e engaged with the conical hole 22c on the upper side, the switching rod 25A
And the switching rod 29A press-fitted into the switching ring 28A at a horizontal position and the spherical body 26 enclosed in the spring hole 21e engaged with the left conical hole 22cc. The switch 29A is press-fitted into the switch 28A, and the switch 29A can be positioned in two positions with respect to a vertical position.

In the sliding cylinder 22A, an auxiliary pin hole is formed at the position where the inner periphery of the hole to be formed on the right side surface of the switching lever 21A is close to the end surface of the collar 22a with the spherical body 26 engaged with the conical hole 22c. 22d, and the auxiliary pin hole 22dd at a position where the inner circumference of the hole to be bored on the left side surface of the switching lever 21A is close to the conical holes 22c and 22cc when the spherical body 26 is engaged with the conical hole 22cc. Drilling with the same radius, each auxiliary pin hole 22d, 22dd
Then, the auxiliary pins 24p and 24pp are projected from the end surface of the collar 22a and press-fitted.

When the switching lever 21A is turned, the operation switching component 20A having the above-described structure rotates the switching rod 25A and the switching element 29A together to rotate the same angle, and when the switching lever 21A is in the neutral position. , The sphere 26 is biased by the spring 27 to come into contact with the end face of the collar 22a of the sliding cylinder 22A, and its turning is free, but the sphere 26 enclosed in the spring hole 21e of the switching lever 21A has the conical hole 22c or 22cc. In the position where it is engaged with
The switching lever 29A of the switching rod 25A is positioned in two positions on the horizontal line or the vertical line by being urged by 7 to come into contact with and engage with the conical inclined surface of the conical hole 22c or 22cc to prevent the switching lever 21A from turning. .

In the operation switching component 20A for the right-handed coil spring, the sliding cylinder 22A has cutouts 22b, 2 formed therein.
Since the rotation is restrained by the 2b and the stop pieces 23A, 23A, when the switching lever 21A is swung clockwise from an arbitrary position, the sphere 26 enclosed in the spring hole 21e of the switching lever 21A becomes a spring. The switching lever 21A is restrained from turning and the shaft center of the switching element 29A of the switching rod 25A is positioned on the horizontal line by being biased by 27 and abutting and engaging with the conical inclined surface of the conical hole 22c. , FIG. 6 (a)
(The operable position of the extrusion pitch tool 9A, which will be described later). When the switching lever 21A is further swung clockwise, the right side surface of the switching lever 21A comes into contact with the auxiliary pin 24p and becomes the turning end in the clockwise direction.

When the switching lever 21A is swung counterclockwise from an arbitrary position, the sphere 26 is biased by the spring 27 and abuts and engages with the conical slope surface of the conical hole 22cc, so that the switching lever 21A swivels. Is suppressed, switching rod 25A
The axis of the switching element 29A is positioned on the vertical line (this position is shown in FIG. 6B, which is a cross-sectional view of the rod driving component 30B for the left-handed coil spring, and will be described later. Inoperable position). When the switching lever 21A is further swung counterclockwise, the left side surface of the switching lever 21A contacts the auxiliary pin 24pp and becomes the counterclockwise swiveling end.

Further, the spherical body 26 enclosed in the spring hole 21e of the switching lever 21A is rotated counterclockwise from the position where it is engaged with the conical hole 22c, or the conical hole 22cc.
When rotated clockwise from the position in which the sphere 26 is engaged with the sphere 26, the sphere 26 resists the bias of the spring 27 due to the wedge action.
Crawling up along the conical slope of c or 22cc, and the contact point of the spherical body 26 reaches the flat portion of the end surface of the flange 22a of the sliding cylinder 22A, and becomes the neutral position.

The operation switching component 20B for the left-handed coil spring also operates in the same manner as the operation switching component 20A for the right-handed coil spring, and the axis of the switching element 29B of the switching rod 25B is switched by the switching lever 21B. The core
It can be positioned on the horizontal line or the vertical line.

Next, FIGS. 5 and 6 (a) drive the rod drive component 30A for driving the switching rod 25A for the right-handed coil spring, and FIG. 6 (b) drive the switching rod 25B for the left-handed coil spring. Rod drive component 3
0B is a vertical cross-sectional view showing a rod drive component 30A for a right-handed coil spring, which has a shaft hole 37a orthogonal to the axis of the switching rod 25A near the upper part of the switching element 29A shown in FIG.
The pivotal support 37A having the hole formed therein is attached to the inside of the front plate 2 above the switching rod 25A, and the shaft hole 3 of the pivotal support 37A is attached.
The pressing drive shaft 31A for transmitting the rotation of the driving lever 33A to the pressing lever 32A is formed in the bearing 31c press-fitted in 7a, and the step portion and the key groove into which the keys 31a, 31b are fitted are formed at both ends of the shaft. It is formed and inserted, both ends of the shaft are projected and pivotally supported so as to be rotatable.

The push drive shaft 31A has a push lever 32A for pushing the switching rod 25A in the forward direction by turning on one end and a push lever 32A for turning on the other end via the push drive shaft 31A. Drive lever 33A
Key 31a or 31b, stop lid 34a or 34b,
In addition, it is keyed so as to be rotatable by the bolts 34c or 34d.

The pressing lever 32A has a U-shaped bifurcated portion 32a at its tip end, and the inner width is larger than the outer diameter of the switching ring 28A.
The outer width is formed to be substantially the same as the length of the switching element 29A, and the U-shaped bifurcation 32a is inserted into the second step from the front end side of the switching rod 25A, and the pressing lever 32A is swung in the forward direction to move U. The bifurcated character 32a is keyed to one end of the pressing drive shaft 31A so that the switching element 29A can be pressed. The drive lever 33A is provided with a bolt hole 33a at a tip end thereof and a universal joint 35A is screwed thereto, so that the universal joint 35A and the universal joint 35A shown in FIGS.
By the connecting rod 36A screwed to the universal joint 45A shown in FIG. 2, the turning of the turning lever 42A shown in FIGS. 2 and 7 is keyed to the other end of the pressing drive shaft 31A so that the turning can be transmitted to the drive lever 33A.

Then, the rod driving component 30A for the right-handed coil spring is connected to the connecting rod 36A through the connecting rod 36A as shown in FIGS.
The rotation from the turning lever 42A shown in (1) is transmitted from the driving lever 33A to the pressing lever 32A via the pressing drive shaft 31A,
When forming the pitch of the right-handed coil spring, as shown in FIGS. 2 and 6 (a), the U-shaped fork 3 of the pressing lever 32A is formed.
The switching element 29A is pressed by the front end surface of 2a.

Further, the rod driving component 30B for the left-handed coil spring has the same action as the rod driving component 30A for the right-handed coil spring, and when the pitch of the left-handed coil spring is formed, the U of the pressing lever 32B is U. The switching element 29B is pressed by the front end surface of the character-shaped bifurcation 32a.

Next, FIG. 7 is a vertical cross-sectional view of the swivel drive component 40A for the right-handed coil spring, with the swivel drive shaft 41A in front at the lowest position shown in FIG. 2 facing the rod drive component 30A. The plate 2 and the rear plate 3 are rotatably supported, and the turning drive shaft 41A is keyed with the turning lever 42A by the key 41a and coaxially with the cam lever 43A by the key 41b.

A bolt hole (not shown) is bored at the tip of the swiveling lever 42A, and a universal joint 45A is screwed onto the swiveling lever 42A. The connecting rod 3 is screwed onto the universal joint 45A and the above-mentioned universal joint 35A.
6A enables the turning of the turning lever 42A to be transmitted to the drive lever 33A described above.
Put on key A. A bolt hole (not shown) is bored at the tip of the cam lever 43A, and a cam follower 44A having a rotatable roller is screwed into the cam lever 43A. The cam follower 44A is pressed against the cam 47A by a spring (not shown) to come into contact therewith. The turning of the cam lever 43A obtained by the displacement can be transmitted to the turning lever 42A via the turning drive shaft 41A.
The cam lever 43A is keyed to the turning drive shaft 41A.

The cam 47A pivotally supports the cam shaft 46A in parallel with the swivel drive shaft 41A between the front plate 2 and the rear plate 3 and is keyed to the cam shaft 46A by the key 46a. Therefore, on the outer circumference of the cam 47A, a cam curved surface 47a whose curvature radius changes sequentially is formed.
Attaches the cam 47A to the cam shaft 46A by a key so that the cam can contact the cam follower 44A. The cam shaft 46A is an N (not shown).
The actuator is rotated by a predetermined angle, for example, by an actuator such as a servo motor (not shown) that is controlled by the C control device or the like and that can control the speed and the rotation angle.

The turning drive component 40A for the right-handed coil spring is driven by a servo motor (not shown).
The cam shaft 46A is rotated by a predetermined angle corresponding to the desired pitch of the coil spring, and the cam follower 4 is rotated by the cam 47A.
The cam lever 43A is swung by displacing the shaft center of 4A, and the swivel is transmitted to the above-mentioned drive lever 33A via the swivel drive shaft 41A, swivel lever 42A, universal joint 45A, connecting rod 36A and universal joint 35A. .

The turning drive component 40B for the left-handed coil spring is the turning drive component 40B for the right-handed coil spring.
The same operation as A is performed, and the swing drive shaft 41B shown in FIG.
It is transmitted to the drive lever 33B via the turning lever 42B, the universal joint 45B, and the connecting rod 36B.

Next, the operation of the present invention constructed as described above will be described as follows.

In the coiling machine according to the present embodiment, in order to form the pitch of the coil spring, a wedge-shaped pitch tool 8 which is commonly used for right-handed and left-handed coil springs, an extruding pitch tool 9A for right-handed coil springs, and a left-handed coil spring. A push-out pitch tool 9B for the coil springs, which normally operate each independently to form the pitch of the coil spring, but a wedge-shaped pitch tool 8 and an extruding pitch tool 9A or In some cases, it may be operated in cooperation with 9B.

First, when the pitch of the coil spring is formed by the wedge-shaped pitch tool 8, the switching levers 21A and 21B shown in FIGS. 3 and 4 are turned counterclockwise to move the respective spherical bodies 26 into the sliding cylinder 22A. , 22B are engaged with the respective conical holes 22cc, and as shown in FIG. 6B, the axes of the respective switching elements 29A, 29B press-fitted into the switching rods 25A, 25B are positioned on the vertical line, The switching elements 29A, 29B are pressing levers 32A, 3
2B, each of the U-shaped bifurcations 32a cannot be contacted with each other, and even if there is a pivotal motion transmitted from the pivotal drive components 40A, 40B to the respective rod drive components 30A, 30B shown in FIG. The action of pressing 25A and 25B is blocked.

The pressing rods 11A and 11B are urged by the respective springs 13A and 13B, the respective retaining rings 16A and 16B come into contact with the rear plate 3, and stand by at the retracted end together with the switching rods 25A and 25B. So Figure 8
As shown in (b), only the wedge-shaped pitch tool 8 has the coil C.
Of the wedge-shaped pitch tool 8 to form a predetermined pitch P and lead angle θ in the coil spring S.

Then, when the pitch is formed on the coil spring by the push-out pitch tool, the wedge-shaped pitch tool 8 is removed in advance or is made to stand by at the retracted position in advance, for example, when forming a right-handed coil spring. As shown in FIG. 3 (a), one of the right-handed coil spring switching levers 21A is turned clockwise to engage the spherical body 26 with the conical hole 22c of the sliding cylinder 22A. Switching element 29A press-fitted into switching rod 25A as shown in FIG.
The axis of the shaft is positioned on the horizontal line so that the switching element 29A can come into contact with the U-shaped fork 32a of the pressing lever 32A, and by the turning of a predetermined angle transmitted from the turning drive component 40A to the rod drive component 30A. The switching element 29A is pushed forward by the pushing lever 32A. Further, the other left-handed coil spring switching lever 21B is operated at the retreat end by performing the operation as described in the description of forming the pitch by the wedge-shaped pitch tool 8 described above.

Then, the pressing rod 11A for the right-handed coil spring advances from the switching element 29A shown in FIG. 2 through the switching rod 25A and the joint 14A by a predetermined amount, and the pressing rod 11A shown in FIG.
As shown in (a), the front surface of the push-pitch tool 9A for the right-handed coil spring attached to the forward end abuts on the rear surface of the coil C to be wound, and is fed out from the wire guide 4c. A predetermined pitch P and a lead angle θ are formed by the action of pushing the path of the wire W formed in the coil C forward in the forming direction of the coil spring S.

When forming a pitch on the left-handed coil spring by the push-out pitch tool 9B, the switching levers 21A and 21B are operated to the right side by operating the switching levers 21A and 21B on the opposite sides to the case where the pitch is formed on the right-handed coil spring. The pressing rod 11A for the spiral coil spring is made to stand by at the retracted end, and the pressing rod 11B for the spiral coil spring is
Is set in a state capable of advancing and retreating, and a predetermined pitch P and a lead angle θ of the left-handed coil spring are formed.

Further, when the wedge-shaped pitch tool 8 and the extrusion pitch tool 9A or 9B are operated in cooperation with each other, a combined operation is performed by the respective operations described above, and, for example, in FIG. 8 (b). The extrusion pitch tool 9A is advanced as shown in FIG. 8A, and the pitch formation of the coil spring by the wedge-shaped pitch tool 8 is assisted by the extrusion pitch tool 9A or 9B.

[0050]

Since the present invention is configured as described above, it has the following effects.

It is not necessary to remove a part of each operating mechanism for advancing the pitch tool which is not operated, and
It is not necessary to remove each pitch tool that is not operated, and since the operation can be switched only by the switching operation of the switching lever, it is easy to work for switching the pitch tool to operate or not to operate, and for a short time. It is possible to change the speed by pressing, and it is possible to improve the production efficiency of the coil spring forming process.

Since it is not necessary to remove each pitch tool which is not operated, it is not necessary to adjust the mounting position when the pitch tools which are not operated are operated next time. The non-operation can be switched in a short time, and the production efficiency of the coil spring forming process can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a configuration of a coiling machine and is a front view thereof.

FIG. 2 is an explanatory view showing the configuration of the pitch tool operation switching device, and is a cross-sectional view taken along the line AA shown in FIG. 1 on the vertical line of the pressing rods for the right-handed coil spring and the left-handed coil spring.

3A and 3B are explanatory views showing a configuration of an operation switching component of the pitch tool, in which FIG. 3A is a view on arrow B shown in FIG. 2, and FIG.
FIG. 3 is a view on arrow C shown in FIG. 2.

4 is an explanatory view showing a configuration of an operation switching component of the pitch tool, and is a cross-sectional view taken along the line D-D shown in FIG.

5 is an explanatory diagram showing a configuration of a rod driving structure portion of the pitch tool, and is a cross-sectional view taken along the line GG shown in FIG.

6A and 6B are explanatory views showing a configuration of a rod driving component of the pitch tool, in which FIG. 6A is a sectional view taken along line EE shown in FIG. 2, and FIG. 6B is a view taken along line FF shown in FIG. FIG.

7 is an explanatory view showing the structure of a turning drive structure portion of the pitch tool, and is a cross-sectional view taken along the line HH shown in FIG.

8A and 8B are explanatory views of the action of forming a pitch in a coil spring, FIG. 8A is a partial view of forming a pitch by an extrusion pitch tool, and FIG. 8B is a partial view of forming a pitch by a wedge-shaped pitch tool. .

[Explanation of symbols]

 8 wedge-shaped pitch tool 9A, 9B push-out pitch tool 11A, 11B pressing rod 20A, 20B operation switching component 21A, 21B switching lever 22A, 22B sliding cylinder 25A, 25B switching rod 29A, 29B selector 30A, 30B rod drive component 32A , 32B Push lever 33A, 33B Drive lever 40A, 40B Swing drive component 42A, 42B Swing lever θ Lead angle C Coil P Pitch S Coil spring W Wire rod

Claims (2)

[Claims] 1. A pitch tool operation switching device for a coiling machine, comprising: a plurality of pitch tool operation parts for forming a pitch of a coil spring; and selecting a desired pitch tool to switch its operation. A pressing rod that is attached to the front end and is capable of advancing and retracting in the molding direction of the coil spring; and an advancing and retracting and rotating switching rod that is provided with a switching element that projects orthogonally to the axis and that moves the pressing rod forward. A switching lever that is attached to one end of the switching rod and that can rotate the switching rod, and that can position the switching rod in two positions, and a servo actuator or a coil spring forming operation mechanism that turns via a transmission mechanism such as a cam. And a pressing lever that comes into contact with a protruding switching element of the switching rod and presses the switching rod by its turning. The lever is used to position the protruding switching element of the switching rod at a position where it can or cannot contact the pressing lever, and the pressing rod with the extrusion pitch tool is switched to a predetermined forward or backward position. A pitch tool operation switching device for a coiling machine, which is characterized in that 2. A conical hole having the same radius and at a right angle from the shaft center is provided with two conical holes so that one end of the switching rod can rotate with the outer periphery of the switching rod and can move forward and backward together with the switching rod. A sliding cylinder is provided so that the switching lever attached to one end of the switching rod is provided with a spring and a spherical body at the same radius as the two conical holes of the sliding cylinder from the axis of the switching rod. The switching lever is urged by the spring so as to be engaged with the conical slopes of the two conical holes, and the switching lever is swung to engage the sphere with one of the two conical holes. 2. The pitch tool operation switching device of the coiling machine according to claim 1, wherein the positioning is performed in two turning directions.