JP2505392B2 - Actuator of pitch tool provided for spring making machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator for a pitch tool (used for manufacturing a spring having a large pitch such as a compression spring) provided for a spring manufacturing machine.

[0002]

2. Description of the Related Art Conventionally, the following spring manufacturing machines are known as this kind of spring manufacturing machine. That is, as shown in FIG. 7, the wire rod feeding device 2 for sequentially sending the wire rod 10 toward the wire rod processing space 7, and the wire rod 10 sent to the wire rod processing space 7 are brought into contact with each other and the wire rod 10 is spiraled as indicated by a chain double-dashed line. Bending die 3 in the shape of a wire, and the wire rod 1 which is becoming spiral in this way
The spring manufacturing machine 1 includes a pitch tool 4 that presses the side surface of 0 in a direction (front side) perpendicular to the paper surface of FIG. 7. As shown in FIG. 8, the pitch tool 4 has a mounting slide rod 5 which is provided so as to penetrate the upright substrate 6 of the spring manufacturing machine 1 at a right angle.
And is slidable forward and backward in the front direction. Therefore, the pitch of the manufactured spring can be increased or decreased by varying the amount of forward / backward sliding of the pitch tool 4 (degree of pressing the wire rod 10). It is also possible to manufacture a tension-dedicated spring having a wire diameter equal to that of the wire 10. In addition to this, the pitch tool 4 is used when the tip of the wire rod 10 first comes into contact with the bending die 3 and starts to form a spiral shape (usually within one turn),
By varying the advancing speed until the wire rod 10 is pressed to a predetermined amount, the seated shape of the end turn portion formed on both ends of the spring can be operated. For example, if the advancing speed of the pitch tool 4 is slowed, a coiled part having a large winding angle can be formed, and conversely, if the advancing speed is increased, a coiled part having a small coiling angle can be formed. The forward / backward sliding of the pitch tool 4 is performed by an operating device using a cam device (not shown). Therefore, the magnitude of the amount of advance and retreat of the pitch tool 4 and the method of setting the timing greatly depend on the shape of the rotary cam included in the cam device. Reference numeral 8 in FIG. 7 is a mandrel that is used when the wire 10 is cut, but the illustration thereof is omitted in FIG.

[0003]

[Disadvantages of conventional spring manufacturing machines] There are various springs having various shapes depending on the place of use and the purpose of use. For example, in the spring body part, not only those with a different pitch between the parts near the ends and the center part, but also those in which the seated shape of the end turn part is completely the same before and after it, or intentionally different Etc. However, in order to manufacture a spring having such a special shape, the pitch tool 4
It is necessary to change the advancing / retreating sliding pattern of 2 to a complicated one in two steps, or to make the advancing / retreating sliding pattern of the advancing sliding and the retracting sliding different from each other. Therefore, the rotary cam (not shown) of the above-described cam device must be removed once and then ground into a special shape using a grinder, or replaced with a rotary cam that is manufactured in a predetermined shape in advance. It was Therefore, the setting was very troublesome.

[0004]

The present invention employs the following means in order to solve the above-mentioned drawbacks. That is, in a pitch tool actuating device provided for a spring manufacturing machine, two cam devices are connected to a mounting rod of the pitch tool via a power transmission mechanism, and each of the cam devices is a rotary cam. A first rocking lever having a cam follower that rocks with the rotation of the rotary cam, a second rocking lever fitted to the rotary shaft of the power transmission mechanism, and a first rocking lever. And a slide piece adapted to be fixed at a desired position while being guided by both the long radial guide provided and the long radial guide provided on the second swing lever. The rotary cams of the two cam devices have arcuate cam lobes, and the cam followers of the first rocking levers of the two cam devices are in the middle of the arcuate cam lobes of the rotary cams. Riding at the same time In this state, the slide guides of the first swing lever and the second swing lever are parallel to each other, and the mounting slide rod is in the most advanced state. .

[0005]

The present invention has the following functions. Since two cam devices are provided, each of them can be adjusted individually. Moreover, at the time of performing the adjustment, both cam devices are
The posture relationship of the first and second rocking levers with respect to the cam lobes of the rotating cam is in a predetermined state (parallel state between slide guides)
It is designed to be. Therefore, even if the position of the slide pieces guided by both slide guides is adjusted in this state, it is possible to adjust only the seated shape in the front and rear end turn portions without adversely affecting the pitch of the spring to be manufactured. Has become. Thus, for example, one cam device may be used to form the front coiled portion of the spring into the desired seated shape and the other cam device may be used to form the rear coiled portion of the spring into the desired seated shape.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in the drawings. As shown in FIG. 1, the mounting slide bar 5 that holds the pitch tool 4 on the front surface of the standing board 6 has sliding guides 11 and 1 on the inner side of the standing board 6.
2, L-shaped lever 13, vertical shaft 14, universal joint 1
5, a power transmission mechanism 17 having a bracket 16 and one rotating shaft 18 (shown by a chain line) is connected.
In addition, the mounting slide bar 5 (and the slide guide 11) has a retracting bias that causes the rotatable roller 57 attached to the slide guide 12 to always contact the hanging arm portion of the L-shaped lever 13. The spring 9 is fitted. Two cam devices 20, 20 are connected to the rotary shaft 18 of the power transmission mechanism 17.

Each of these cam devices 20 and 20 has a rotary cam 23, a first swing lever 21 which swings as the rotary cam 23 rotates, and a swing of the first swing lever 21. And a second swing lever 22 that swings in a cross shape in relation to the movement. Then, the second swing lever 22
The portion serving as the fulcrum of swinging corresponds to the rotating shaft 18 of the power transmission mechanism 17 described above. It should be noted that both of these cam devices 20 and 20 have their respective rotary cams 2
The camshafts 24 and 3 are held by one cam shaft 24 and are synchronously driven to rotate. A cam follower 54 that abuts the outer circumference of the rotary cam 23 is rotatably held at the tip of the first swing lever 21.

As shown in FIG. 2, the first swing lever 21 is formed with a long hole 25 penetrating the front and back sides thereof (FIG. 1).
reference). Inside the elongated hole 25, the first swing lever 21
Along the radial direction (longitudinal direction of the first rocking lever 21) with respect to the rocking state of the first rocking lever 21.
A round bar-shaped slide guide 26 is provided so as to penetrate through the end of the swing central shaft 19 side and project outward. A portion of the slide guide 26 that faces the inside of the elongated hole 25 is a screw, and a knob portion 27 is provided at a portion that projects outward from the first swing lever 21. And
A slide piece 28 is screwed to the screw portion of the slide guide 26. A rotatable bearing 31 that projects toward the second swing lever 22 is attached to the slide piece 28, and a tightening screw 29 that projects toward the opposite side is provided. A shifter lever 30 is screwed into the tightening screw 29. Therefore, if the knob 27 is turned with the shifter lever 30 loosened, the slide piece 2
8 can be guided and moved along the longitudinal direction of the first swing lever 21, and by tightening the shifter lever 30, the slide piece 28 can be fixed according to the position at that time.

On the other hand, the second rocking lever 22 has a groove shape along the radial direction (longitudinal direction of the second rocking lever 22) with respect to the rocking state with respect to the surface facing the first rocking lever 21. The slide guide 32 is formed. The bearing 31 of the above-mentioned slide piece 28 is fitted in and guided by the slide guide 32.

The slide guide 26 of the first swing lever 21 and the slide guide 32 of the second swing lever 22 are arranged such that the cam follower 54 of the first swing lever 21 is a circle of the rotary cam 23 as shown in FIG. It is assembled so as to be parallel to each other while riding on the arc-shaped cam mountain.
Then, this state can occur simultaneously in both of the two cam devices 20, 20. In such a state, the first swing lever 21 will not swing higher than this, so at this point the pitch tool 4
It is obvious that the mounting slide bar 5 of No. 1 corresponds to the most advanced state. Even if the slide piece 28 is aligned in this state, there is no possibility that the degree of advance of the pitch tool 4 is adversely affected when the rotary cam 23 is rotated thereafter. In the two cam devices 20, 20, whichever slide piece 28, 28 is positioned, the advantage is obtained that it does not lead to disturbing the pitch of the spring (not shown) to be manufactured. Become. Positioning of the slide piece 28 is an operation for variously changing the seated shapes of the front coiled portion and the rear coiled portion of the manufactured spring (not shown), and details of this point will be described later.

One of the cam devices 20, 20 shown in FIG.
The individual (for example, 20 (A)) is the first swing lever 21.
It is provided so that the swing center shaft 19 of can be moved up and down. That is, this vertical movement is performed when the cam follower 54 of the first swing lever 21 rides on the cam crest of the rotary cam 23 and the slide guide 2
6 (see FIG. 2) and the slide guide 32 of the second swing lever 22 are prevented from being parallel to each other. As a specific structure for realizing this, as shown in FIG. 2, a fulcrum holding piece 33 for holding the swing center shaft 19 on the back side of the first swing lever 21 is attached to the base frame 40 and the like. Bracket 34
In contrast, the bolt 36 is held by a bolt 36, and the bolt 36 can move up and down along a long hole 35 formed long in a direction perpendicular to the paper surface of FIG. is there. In this way, the vertically moving structure of the swing center shaft 19 adopted in the cam device 20 (A) has the pitch of the spring (not shown) to be manufactured on the other cam device 20.
It is used in the case of setting the pitch in (B) and roughening the pitch only in a desired part of it, but details regarding this point will be described later.

By the way, the power transmission mechanism 17 shown in FIG.
The vertical shaft 14 has a pitch adjusting handle 41 at the top thereof. The pitch adjusting handle 41 is screw-fitted to the vertical movement shaft 14, and when the cam devices 20 and 20 are stopped, the pitch adjustment handle 41 moves vertically when the cam devices 20 and 20 are rotated clockwise. The sleeve 42 externally inserted on the upper side of the shaft 14 pushes the horizontal arm portion of the L-shaped lever 13 downward,
The pitch tool 4 is moved forward in the front direction of the standing substrate 6. On the contrary, when the pitch adjusting handle 41 is rotated counterclockwise, the pitch tool 4 is moved in and out in the opposite direction. With such a structure, when the cam devices 20 and 20 operate, the pitch tool 4 can be adjusted to the most advanced state, that is, how much the side surface of the wire 10 (see FIG. 8) is pressed. Therefore, in the end, the pitch of the manufactured spring is adjusted.

Reference numeral 50 in FIG. 1 is a stopper adjusting handle. The stopper adjusting handle 50 is provided with a stopper 51 for preventing the sliding in the retracting direction from being performed more than necessary when the cam devices 20 and 20 operate and the pitch tool 4 repeats forward and backward sliding. The position of can be adjusted. As a result, unnecessary movement of the pitch tool 4 can be omitted.

[0014]

Next, the operation of the embodiment apparatus will be described.
When manufacturing a spring (not shown) in which the front end winding portion and the rear end winding portion have different seating shapes, the following is performed. First,
As shown in FIG. 1, in the cam devices 20 (A) and 20 (B), the relative mounting angles of the rotary cams 23, 23 with respect to the cam shaft 24 are set so as to be slightly shifted. In the figure, when the cam shaft 24 is rotated in the arrow direction, the cam device 20 (A) precedes the timing at which the cam follower 54 of the first swing lever 21 rides on the cam crest of the rotary cam 23. I am doing it. Therefore, the first swing lever 2
The cam device 20 (B) is delayed in the timing at which the first cam follower 54 descends from the cam mountain. However, in both cam devices 20 (A) and 20 (B), the second swing levers 22 and 22 that swing in association with the first swing levers 21 and 21 move the rotary shaft 18 It oscillates in a synchronous manner via the oscillating pattern, and its oscillating pattern is
In addition, as shown by the broken lines from X1, X2 to Y3, Y4, they are integrated. That is, in this swing pattern, X1 to X2 are controlled by the cam device 20 (A), and X2 to Y3 are both cam devices 20 (A),
20 (B), and Y3 to Y4 are controlled by the cam device 20 (B). Therefore, the pitch tool 4 causes forward sliding based on the cam device 20 (A) to form a front end wound portion of a spring (not shown), and causes forward / backward sliding based on the cam device 20 (B). A rear winding part of a spring (not shown) is formed. Note that X3 to X4 and Y1 to Y2 shown in FIG. 4 are the second swing levers 2 of the cam devices 20 (A) and 20 (B).
Reference numerals 2 and 22 show swing timings when the swing relations with the other ones are disregarded and they are independently operated, and such swing does not actually occur. Absent.

Next, each cam device 20 (A), 2
At 0 (B), the shape of the spring (not shown) to be manufactured in the front end portion and the rear end portion is separately adjusted. To make this adjustment, both cam devices 20 must be
In (A) and 20 (B), the cam follower 54 of the first swing lever 21 rides on the cam mountain of the rotating cam 23,
Slide guides 26 and 32 of both levers 21 and 22
(See FIG. 2) should be parallel to each other. FIG. 3 shows the second swing with respect to the swing of the first swing lever 21.
FIG. 7 is an operation diagram schematically showing a situation in which the swing lever 22 swings in relation to each other. As in the cam device 20 (A) shown in FIG. 1, when the slide piece 28 (A) is positioned at a position closer to the swing center axis 19 of the first swing lever 21, the second swing lever 22 ( The swing angle α in A) is small, so that
The vertical movement of the vertical shaft 14 and the L-shaped lever 1
Since the swing angle of 3 is also small, the amount of forward / backward sliding of the pitch tool 4 is also small. That is, the cam device 20 (A)
While the rotary cam 23 rotates at a constant speed, the sliding amount of the pitch tool 4 is small, so the time required for the sliding is slow. Therefore, the cam device 20 (A)
The front end portion of the spring (not shown) formed by
As shown by m in the figure, the number of end-turn portions increases. On the contrary, like the other cam device 20 (B) shown in FIG. 1, the slide piece 28 (B) is positioned at a position distant from the swing center shaft 19 of the first swing lever 21. In this case, since the swing angle β of the second swing lever 22 (B) becomes large, the amount of forward / backward sliding of the pitch tool 4 becomes large this time.
Therefore, the pitch tool 4 can be slid quickly,
A spring (not shown) formed by the cam device 20 (B)
The rear end turn portion has a smaller end turn portion as indicated by n in FIG. As described above, in the spring (not shown) manufactured by the device of this embodiment, the front end winding portion has a seating shape with a large winding angle, and the rear end winding portion has a seating shape with a small winding angle.

In the case of manufacturing a spring (not shown) in which the pitch is coarser in the central portion than in the portions near the both ends of the spring body, the following is done. Of the two cam devices 20 (A) and 20 (B) shown in FIG. 1, the cam device 2 having the vertical movement structure of the swing center shaft 19 as described above.
0 (A) has a predetermined effect when the pitch of the spring (not shown) to be manufactured is roughened at a desired portion thereof. Therefore, first, a spring (not shown) to be manufactured by a cam device 20 (B) other than this.
Starting from the operation of setting the reference pitch (the finer pitch to be formed at the portions near both ends of the spring body) throughout the whole.

This setting operation is performed by the pitch adjusting handle 41.
Is operated to adjust the degree of advancement of the mounting slide bar 5 holding the pitch tool 4 when it is most advanced. To make this adjustment, at least the cam device 2
At 0 (B), the cam follower 54 of the first swing lever 21 rides on the cam ridge of the rotary cam 23, and the slide guides 26, 3 of both levers 21 and 22 are set.
2 (see FIG. 2) must be parallel. At this time, the shifter lever 30 is operated to operate both levers 21 and 2.
The swing relationship with 2 (the shape of the front and rear end turn portions with respect to the spring) is also adjusted. In the cam device 20 (B) for which these settings and adjustments have been completed, by rotating the cam shaft 24, the second rocking lever 22 of the cam device 24 (X 1) shown in FIG.
It draws a broken line extending over 2, X3, and X4 to swing.

Next, regarding the cam device 20 (A) having the vertical movement structure of the swing center shaft 19 as shown in FIG. 5, the arc length of the cam crest 23a of the rotary cam 23 is the spring to be manufactured. (Not shown) is adjusted to have a length required to form the central portion (portion where the pitch is to be made coarse) of the spring body. This adjustment is made by the rotary cam 2
3 is performed by increasing the degree of superposition when the two cam plates 55 and 56 are superposed. Then, in the rotary cam 23, the center of the arc length of the cam crest 23a faces straight up, and in the rotary cam 23 of the cam device 20 (B), the center of the arc length of the cam crest 23b faces straight up. The relative mounting angles of the rotary cams 23, 23 with respect to the cam shaft 24 are set so that the state and the state match each other.

At the time when the rotary cams 23, 23 are aligned as described above, the cam follower 54 of the first swing lever 21 is rotated by the cam follower 54 of the first swing lever 21 as shown by the chain double-dashed line in the cam device 20 (B). It is in a state of riding on the cam mountain 23b. Although not shown in the drawing, this is the same in the cam device 20 (A). Therefore, even if the rotary cams 23, 23 are rotated, the first swing levers 21, 21 and the second swing levers 22, 22 are rotated.
(All of which are shown by two-dot chain lines) do not oscillate any higher, so that the mounting slide bar 5 (see FIG. 1) holding the pitch tool 4 is in the most advanced state at this point. Therefore, next, the swing center shaft 19 of the first swing lever 21 in the cam device 20 (A) is moved upward. Along with this movement, the second swing lever 22 having a correlation is also moved via the slide piece 28 so that the upper end of the swing region becomes higher. Therefore, as is apparent from FIG. 1, the rotary shaft 18 and the bracket 16 are rotated in the clockwise direction, and the vertical shaft 14 and the L-shaped lever 1 are rotated.
The horizontal arm portion 3 is pulled down, and the pitch tool 4, which was in the most advanced state as described above, is further moved forward. That is, in the cam device 20 (B), after the cam follower 54 of the first swing lever 21 rides on the cam crest 23b and positions the second swing lever 22 at the upper end of the swing region (two points in FIG. 5). Even in the chain line state, in the cam device 20 (A), when the cam follower 54 of the first swing lever 21 rides on the cam crest 23a, the second swing lever 22 is swung further upward. (The second swing lever 22 of the cam device 20 (B) is also synchronized), so that the mounting slide rod 5 for holding the pitch tool 4 carries out two-stage advancing slide. . Of course, when the mounting slide rod 5 retracts, two-step sliding is performed as in the above case.

After all, the sliding driving force along the polygonal line extending along X1, X2, P1, Z2, Z3, P2, X3 and X4 shown in FIG. 6 is transmitted to the pitch tool 4. In this case, the polygonal line extending from Z1 to Z4 separates the second swing lever 22 of the cam device 20 (A) from each other (see the swing relationship with the second swing lever 22 of the cam device 20 (B). It is the rocking situation when it is operated (ignoring). The spring (not shown) manufactured in this manner has a fine pitch at the portions near both ends of the spring body and a coarse pitch at the central portion.

[0021]

The present invention has the above-mentioned structure.
The following effects are achieved. At least two cam devices for sliding the pitch tool forward and backward are provided, and these cam devices can be adjusted individually. Therefore, depending on the method of adjustment, the springs may have different pitches between the spring body portion near the ends and the center portion, or the seated shape of the end turn portion may be exactly the same before and after, or intentionally. It is easy to manufacture different springs without having to grind or replace the rotating cams of the cam device one by one.

[Brief description of drawings]

FIG. 1 is a schematic side sectional view showing an actuator for a pitch tool according to the present invention.

FIG. 2 is an enlarged plan sectional view taken along line III-III of FIG.

FIG. 3 is an operation diagram schematically showing a situation in which a second swing lever swings relative to a swing of a first swing lever.

FIG. 4 is a diagram that clearly shows a situation in which each of the second swing levers swings when each rotary cam makes one rotation in the state of FIG. 1.

FIG. 5 is a diagram for explaining an example of an adjusting method for two cam devices.

FIG. 6 is a diagram that clearly shows a situation in which each of the second swing levers swings when each rotary cam makes one rotation in the state of FIG. 5;

FIG. 7 is a schematic front view showing a conventional spring manufacturing machine.

FIG. 8 is an enlarged plan sectional view taken along line II-II of FIG.

[Explanation of symbols]

 1 Spring Making Machine (Conventional) 2 Wire Rod Feeding Device 3 Bending Die 4 Pitch Tool 7 Wire Rod Processing Space 10 Wire Rod 17 Power Transmission Mechanism 19 Swing Center Shaft 20 Cam Device 21 First Swing Lever 22 Second Swing Lever 23 Rotating Cam 23a cam crest 23b cam crest 26 slide guide (first swing lever) 28 slide piece 32 slide guide (second swing lever)

Claims (2)

(57) [Claims] 1. A wire rod feeding device for sequentially feeding wire rods into a wire rod working space, a bending die for abutting the wire rods fed into the wire rod working space to make the wire rod spiral, and sliding forward when necessary. A pitch tool actuating device provided for a spring manufacturing machine having a pitch tool that slides in and out at the same time by pressing a side surface of a wire rod that is becoming spiral, and at the same time, mounting and sliding the pitch tool. Two cam devices are connected to the rod via a power transmission mechanism, and each of the cam devices is a rotating cam and a first swing lever having a cam follower that swings with the rotation of the rotating cam. A second swing lever fitted to the rotary shaft of the power transmission mechanism, a slide guide provided on the first swing lever in the radial direction and a long slide guide provided on the second swing lever in the radial direction. Su And a slide piece adapted to be fixed at a desired position while being guided by both the ride guides, and the rotary cams of the two cam devices have arcuate cam lobes, The cam followers of the first rocking levers of the two cam devices are designed to ride up simultaneously in the middle of the arcuate cam lobes of the rotary cams. In this state, the slide guides of the first rocking lever and the second rocking lever are arranged. Is an actuator for a pitch tool provided for a spring manufacturing machine in which the mounting slide bar is in the most advanced state. 2. The first swing at the position where the swing center axis of the first swing lever of the one cam device is mounted on the arc-shaped cam lobe of the rotary cam by the cam follower of the first swing lever. 2. The pitch tool actuating device provided for the spring manufacturing machine according to claim 1, wherein the lever and the slide guides of the second swing lever are movable up and down so as to break the parallelism.