JPH0321787Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is applied to a pitch mechanism of a coil spring manufacturing device that manufactures coil springs such as compression springs by bending and cutting a wire fed from a wire feeding mechanism. Regarding.

[Conventional technology]

In general, coil spring manufacturing equipment bends a coil spring wire material to a certain curvature to form a coil spring, which is wound onto a reel stand and straightened into a straight line by a strainer before being fed. It consists of a wire feeding mechanism that feeds the straightened wire, a coiling mechanism that bends the wire to a certain curvature, a cutting mechanism that cuts the coil, and a pitching mechanism that pitches the coil spring. Usually, these wire feeding mechanisms, coiling mechanisms (when manufacturing deformed springs such as conical or barrel-shaped springs),
The cutting mechanism and the pitching mechanism (for example, when forming a compression spring) are synchronized and interlocked from the same drive source during the manufacture of a coil spring. When manufacturing a coil spring, the winding diameter, wire diameter, pitch, etc. of the coil spring naturally vary depending on the characteristics that the coil spring should have, but various mechanisms are adjusted each time according to the various dimensions of the spring. This tends to cause variations in product accuracy, and furthermore, it is difficult to adjust each mechanism itself, and it takes a long time for adjustment. In particular, in a coil spring manufacturing apparatus, a large number of coil springs are manufactured per unit time, and a long adjustment time reduces the operating rate of the apparatus and makes manufacturing, work, etc. inefficient.

In order to solve these troubles, a coil spring manufacturing apparatus has been disclosed, for example, as described in Japanese Utility Model Publication No. 42583/1983. For this coil spring manufacturing equipment, in order to make it possible to form springs of different shapes and dimensions, several units with wire diameters, winding diameters, pitches, etc. set in advance are prepared, and the units can be changed as needed. Coil springs are formed by selecting a unit and setting it in the main body of the device.When forming springs of different shapes and dimensions, all you have to do is attach and detach the pre-adjusted unit, and stop the operation of the device. This only needs to be done when attaching/detaching/replacing the coil spring, reducing the time the equipment will be stopped due to changes in the specifications of the coil spring.
It is said that the time required for adjustment is short and there is no variation in products due to adjustment errors, however,
The specifically disclosed devices are as follows. Regarding this coil spring manufacturing device, the fourth
This will be explained in detail with reference to the drawings.

That is, as shown in FIG. 4, in this coil spring manufacturing apparatus 101, an arbor 103 for forming a coil spring is erected on one base 102 facing toward the front, and above the arbor 103 is an arbor 103 for forming a coil spring. A coiling pin 104 that allows a desired angle to be selected with respect to the arbor 103 is attached to a pin angle adjustment table 10.
5, and the pin angle adjustment table 105 is guided by a sliding plate guide 107 on the base 102, and is slid by an operating lever 108 on a lever 109 pivoted on the main body of the device. The coiling pin device 127 is configured by being attached to the top of the coiling pin device 127. In addition, on both left and right sides of the arbor 103, horizontal sliders 115 are provided which slide in the direction of the arbor 103 guided by horizontal slider guides 116 on the base 102, and a cutter 114 is installed at the tip of the slider 115. The cutter device 126 can be attached and detached freely.
It is said that Furthermore, below the arbor 103, a pair of feed rollers 121 are provided adjacent to each other at the front ends of two shafts passing through the base 102 back and forth.
The shaft rear end of the feed roller 121, that is, the base 10
A gear (not shown) is pivotally attached to the back surface of the feed roller 121, and a final wire guide 123 is attached above and below the adjacent portion of the feed roller 121, and a pressure adjustment screw 122 is provided to adjust the finger pressure of the feed roller 121. It constitutes an installed wire feeding device 128. The base 102 is connected to these cutter devices 12.
6. Coiling pin device 127 and wire feeding device 1
By attaching this unitized base 102 to the front of the device body, the operating rod 108 on the lever 109 pivotally mounted on the device body is placed on the sliding plate 106 of the coiling pin device 127. is in the connected state, and the groove 116 recessed in the outer end of the sliding plate 115 of the cutter device 126
A roller 117 at the tip of a swinging rod 118 pivotally mounted on the main body of the device is inserted into the inner part, and the cutter 114 slides in the direction of the arbor 103 by an appropriate movement from the movement mechanism. A roller provided at the end of a lever (not shown) pivotally mounted on the main body of the device comes into contact with the roller, which operates the pitch tool 111 by the operation from the pitch adjustment device, and also controls the rear axis of the feed roller 121 of the line feed device 128. These gears are configured to operate in series so that a gear (not shown) pivotally attached to the end meshes with a drive gear installed in the main body of the device to appropriately feed out the wire W to the arbor 103.

In this coil spring manufacturing apparatus 101, when attaching the unit base 102 to the apparatus main body, the gear at the rear end of the shaft of the feed roller 121 is engaged with the drive gear installed in the apparatus main body, and the cutter 114 A swinging rod 118 with a sliding plate 115 and a pitch tool 111 mounted on the main body.
In addition to fitting or contacting the upper roller 117 and the roller on the ramrod, the sliding plate 106 of the coiling pin 104 is also connected to the ramrod 10 on the main body of the apparatus in the same manner as above.
9 through an operating rod 108.

Next, with reference to FIG. 5, an example of the pitch mechanism 130 used in the coil spring manufacturing apparatus will be described.

The pitch mechanism 130 is necessary when manufacturing compression coil springs etc. as already mentioned.
The pitching process in the coil axis direction of the spring when forming a compression coil spring will be described later, but it can be adapted to the case where the pitch mechanism of the coil spring manufacturing apparatus according to this invention is applied to the coil spring manufacturing apparatus 1. This is done by pushing out the wire with the pitch tool 23 toward you in FIG. 2, that is, perpendicular to the plane of the paper. That is, the wire rod W sent from the wire feeding mechanism 5 and brought into contact with the coiling pin 15 and bent around the arbor 20 comes into contact with the pitch tool 23 at the side and is pushed out in the direction of the coil axis. Since this process is performed continuously on the wire rod W, a coil spring having a predetermined pitch is formed.

In the pitch mechanism 130 shown in FIG. 5, the pitch tool 129 is attached to the tip of a rod extending from the pitch block 131. The pitch block 131 is fixed to the lower end of a T-shaped bell crank 132 which is swingable by a shaft 133. A pitch stop screw 134 is attached to one upper end of the bell crank 132, and prevents the pitch tool 129 from returning further when it comes into contact with the device body (not shown). On the other side of the bell crank 132, the pitch adjustment knob 13
5 and a pull rod 137 via a spacer 136.
is engaged. A return rod 138 is fixed to the pitch block 131 in parallel with the rod to which the pitch tool 129 is attached.
A return spring 139 is wound around 38, and one end of the return spring 139 abuts against the device body (not shown) to bias the pitch tool 129 in the return direction. Therefore, when the pull rod 137 is pulled downward by the pitch cam mechanism described later, the bell crank 132 moves against the force of the return spring 139 via the pitch adjustment knob 135 and the spacer 136, and moves the shaft 1.
33 in the counterclockwise direction in the figure, thereby pushing out the pitch tool 129 to give the coil wire W a predetermined pitch. When the force to push down the pull rod 137 from the pitch cam mechanism disappears, the return spring 13 wound around the return rod 138
9 pushes the pitch block 131 and therefore the pitch tool 129 in the return direction, and tightens the pitch stop screw 1.
34 is returned until it comes into contact with the device main body (not shown).

The pitch cam 140 is a cam that pushes down the pull rod 137 to cause the pitch tool 129 to perform a desired pushing operation, and is clamped and fixed to a pitch cam holder 142 integrated with a pitch cam shaft 143 by a pitch cam presser 141. The pitch camshaft 143 rotates in synchronization with the wire feeding mechanism, and rotates once to form one coil.

A cam roller lever 145 is rotatably supported on a connecting rod 146 arranged parallel to the pitch camshaft 143.
45 has a cam roller 144 pivotally supported at its tip in parallel with the pitch cam shaft 143, and the cam roller 144 comes into contact with the cam peripheral surface of the pitch cam 140 and rolls. One end of a compound lever 148 having a rectangular cross section is rotatably supported on a shaft 150 parallel to the connecting rod 146. A lever block 147 is mounted on the tip side of the compound lever 148, and a lever block 147 is mounted near the center of rotation. A connector 151 with a pull rod 137 is provided. The lever block 147 is connected to the compound lever 148 by a lever block adjustment screw 149 provided at the tip of the compound lever 148.
The lever is configured to be adjustable in the axial direction,
It is configured so that the contact point with the cam roller lever 145 can be adjusted, that is, the ratio of each lever to the connecting rod 146 and the shaft 150 can be changed.
The upper surface of the lever block 147 is a smooth convex surface to reduce sliding friction with the cam roller lever 145. The connector 151 is integral with the pull rod 137 but is pivotally supported on the compound lever 148.

As is well known, the pitch cam 140 is composed of two cam plates divided in the axial direction, and by adjusting the relative cam phase of these two cam plates, the pitch cam 140 can be adjusted to The rise can be easily adjusted.

Since the pitch cam mechanism is configured as described above, when the portion corresponding to the peak of the pitch cam 140 comes into contact with the cam roller 144, the cam roller lever 145 and the compound lever 148 are pushed down, and the pitch tool is moved through the bell crank 132. 129 will be pushed out. When the portion of the pitch cam 140 corresponding to the valley rotates, the cam roller 144 follows the pitch cam 140 due to the return action of the return spring 139. In addition, in the figure, the reference numeral 147a indicates a cap screw.

Further, the relationship between the lever block 147 and the compound lever 148 may be configured as shown in FIGS. 6A and 6B. Parts that achieve the same function are given the same reference numerals, and explanations thereof will be omitted.

[The problem that the idea aims to solve]

In the case of the pitch mechanism 130 of such a conventional coil spring manufacturing apparatus, there is a large "variation" in the free length of the coil springs such as compression springs to be manufactured, and a large variation in the load-deflection characteristics, which is an important characteristic of coil springs, is said to be large. There was a problem.

If this "variation" in spring characteristics is large, defective products will occur frequently, and it will not be possible to meet the market demand for a smaller tolerance in load-deflection characteristics.
An important element that determines the free length of a coil spring is the pitch of the coil spring, but the pitch mechanism of the coil spring manufacturing equipment determines this pitch during spring manufacturing, which prevents "variations" in the pitch of the coil spring. The following points can be cited as factors that cause this to occur.

(1) The vibration resonance of the pull rod 137 during manufacturing of the coil spring is large.

(2) Poor followability between pitch cam 140 and cam roller 144 during coil spring manufacturing. and (3) The clearance of each lever from the pitch cam 140 to the pitch tool 129, that is, the connecting portions of the cam roller lever, compound lever, bell crank, etc., is large.

The purpose of this invention is to solve the above problem, and to create a structure that prevents "variations" in the pitch of the coil spring, and specifically, to accurately reflect the cam action of the pitch cam in the movement of the pitch tool. It is an object of the present invention to provide a pitch mechanism for a coil spring manufacturing apparatus that can perform the following steps.

[Means to solve the problem]

In order to achieve the above object, this invention is constructed as follows. That is, this invention consists of a pitch cam, a cam roller lever that swings following the pitch cam, a compound lever that swings in contact with and follows the cam roller lever, and one end of which is attached to the compound lever and the other end of which is a pitch tool. In a pitch mechanism of a coil spring manufacturing apparatus consisting of a pull rod linked to a mechanism that provides reciprocating motion, an air cylinder provided to maintain a follow-up response of the pitch tool to the pitch cam;
The present invention also relates to a pitch mechanism for a coil spring manufacturing apparatus having a pressure gauge provided to set the pressure of compressed air supplied to the air cylinder to a predetermined pressure.

[Effect]

The pitch mechanism of the coil spring manufacturing apparatus according to this invention is constructed as described above, and thus operates as follows. In other words, one spring is formed during one rotation of the pitch cam, but when the peak of the pitch cam with a large radius comes into contact with the cam roller lever, the compound lever is pushed down, and one end of the spring is attached to the compound lever. The pull rod to which the coil is attached is also lowered, and the pitch tool is finally moved to perform the end winding at the beginning of winding the coil and to pitch the spring wire being coiled. When the pitch cam moves from a peak with a large radius to a trough with a small radius, the pitch tool is returned to its initial position and the end winding of the coil is performed.
At this time, an air cylinder interposed between the compound lever and the main body of the device prevents vibration and resonance of the pull rod and ensures movement of the pitch tool following the cam shape of the pitch cam. For this reason,
Variations in the pitch of the coil springs formed can be suppressed to a small level.

〔Example〕

Hereinafter, one embodiment of the pitch mechanism of the coil spring manufacturing apparatus according to this invention will be described in detail with reference to the drawings.

FIG. 1 shows a coil spring manufacturing apparatus 1 incorporating a pitch mechanism according to this invention. This coil spring manufacturing apparatus 1 includes, in addition to a tool cassette 3, an apparatus main body 2, a strainer 4, and a wire feeding mechanism 5.
Contains. The coil spring wire W (see Fig. 2) wound on a reel stand (not shown) is
The wire is sent to the wire feeding mechanism 5 while the strainer 4 corrects the distortion. The coil spring wire W is sent to the tool cassette 3 by the wire feeding mechanism 5, and is formed into a coil having desired dimensions. As shown in FIGS. 1 and 2, this tool cassette 3 is attached to the upper part of the apparatus main body 2 so as to match with the outlet of the feed roller 6 of the line feeding mechanism 5.

An arbor holder mounting plate 19 is fixed to the line feed mechanism 5 side of the tool cassette 3. The arbor holder mounting plate 19 includes an arbor 20 that forms a coiling mechanism together with the coiling pin 15, and a wire guide 21 for guiding the coiled spring wire W.
is fixedly provided. Further, a block guide 22 and a pitch tool 23 constituting a pitch mechanism are attached to the arbor holder mounting plate 19. An arbor holder 24 that holds an arbor 20 is attached to the back surface of the arbor holder mounting plate 19, and a pitch tool shaft 25 for driving a pitch tool 23 passes through the rear surface of the arbor holder mounting plate 19. It is possible to reciprocate in the penetrating direction. When the tool cassette 3 is attached to the machine body 2, the arbor holder 24 is inserted into the machine body 2 at the same time as the base 7, so it is set by screwing in the holding bolt for the arbor holder 24 from the outside of the machine body 2, and the pitch tool shaft is If a predetermined timing measure is taken at 25, loading of the tool cassette 3 into the main body 2 of the apparatus is completed.

The pitch mechanism 30 of the coil spring manufacturing apparatus 1 is the third
It is shown in the figure and will now be described.

The air cylinder 52 used in the pitch mechanism of the coil spring manufacturing apparatus according to this invention is pivotally connected to the compound lever 48 at its upper end via a connecting fitting 53, and at its lower end to the apparatus main body 2.
It is configured to be pivotally connected to the clevis 54 by means of a clevis 54.

Since compressed air at a pressure set by the pressure gauge 55 is supplied into the air cylinder 52, the lever block 4 of the compound lever 48
7 is brought into pressure contact with the cam roller lever 45 so that there is no gap, and the cam roller lever 45
The roller 44 is pressed against the cam peripheral surface of the pitch cam 40 without any gaps.

One compression coil spring is manufactured by one rotation of the camshaft 43 clockwise in the figure, but when the ridge with a large radius on the periphery of the pitch cam 40 rotates to the cam roller 44, the cam roller The lever 45 is pushed down around the connecting rod 46, and the lower surface of the cam roller lever 45 pushes the compound lever 48 down around the shaft 50 via a lever block 47 whose setting position can be changed and fixed. As a result, the pull rod 37 is pulled downward, causing the bell crank 32 to swing and pushing the pitch tool 23 forward. Pitch tool 23
A predetermined pitch is applied to the coil spring wire W by the stroke displacement. When the peak of the pitch cam 40 becomes small, the pitch tool 23 is returned to its original position by the return spring 39.

During one rotation of the pitch cam 40, the air cylinder 52
The air cylinder 52 is constructed so that the cam roller 44 is always pressed into contact with the pitch cam 40 through the compound lever 48, lever block 47, cam roller lever 45, and cam roller 44 due to the action of compressed air supplied inside. cam roller 44 and both levers 45, 48 both when the pitch tool 23 moves forward and when it moves backward.
Good followability to the pitch cam 40. At the same time, the gap between the connecting parts of each component can be reduced in one direction. In addition, since the pull rod 37 is long, it is likely to cause vibration and, in some cases, resonance due to the reaction force transmitted from the coil spring wire W through the pitch tool 23 and the bell crank 32. Since such undesirable vibrations are alleviated and absorbed, the stroke position of the pitch tool 23 can be maintained well. Furthermore, the contact forces of the pitch cam 40, cam roller 44, and both levers 45, 47 can be easily adjusted by changing the set pressure of the pressure gauge 55. In addition, in the figure, the code 31 is a pitch block;
3 is a shaft, 34 is a pitch stop screw, 35 is a pitch adjustment knob, 36 is a spacer, 41 is a pitch cam retainer, 42 is a pitch cam holder, 47a is a retainer screw, 49 is a lever block adjustment screw, and 51 is a connector.

[Effect of idea]

Since the pitch mechanism of the coil spring manufacturing apparatus according to this invention is constructed as described above, it has the following effects. In other words, the pitch mechanism of this coil spring manufacturing device includes an air cylinder provided to maintain the follow-up response of the pitch tool to the pitch cam, and an air cylinder provided to set the pressure of compressed air supplied to the air cylinder to a predetermined pressure. Since the pressure gauge is provided, the pressing force of the pitch cam can be adjusted extremely easily and quickly by simply changing the settings of the pressure gauge.

Further, since the contact between the roller and the lever from the pitch cam to the compound lever is constantly pressurized and a gap is created, the responsiveness to the pitch cam is extremely good. Furthermore, since vibrations and resonances due to reaction from the pitch tool side to the long pull rod are relaxed and absorbed, the followability of the pitch tool to the pitch cam is also extremely good. As a result, it is possible to significantly reduce the "variation" in the stroke operation of the pitch tool, and the "dispersion" in the pitch of coil springs such as compression springs, which are products, and even in the free length of the coil springs. It can also fully meet the market demand for smaller deflection characteristic tolerances.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the entire coil spring manufacturing apparatus in which the pitch mechanism of the coil spring manufacturing apparatus according to this invention is implemented, and Fig. 2 shows the main parts of the coiling mechanism including the pitch tool of the pitch mechanism of Fig. 1. 3 is a perspective view showing the pitch mechanism of the coil spring manufacturing device according to this invention, FIG. 4 is a plan view showing an example of the conventional coil spring manufacturing device, and FIG.
The figure is a perspective view showing the pitch mechanism of the coil spring manufacturing device, FIG. 6A is a side view showing the relationship between the lever block, compound lever, and lever block adjusting screw in the pitch mechanism, and FIG. 6B is the same as in FIG. 6A. FIG. 1... Coil spring manufacturing device, 2... Device main body,
5... Line feeding mechanism, 15... Coiling pin, 2
0... Arbor, 23... Pitch tool, 24...
Arbor holder, 30...Pitch mechanism, 37...Pull rod, 40...Pitch cam, 43...Pitch cam shaft, 44...Cam roller, 45...Cam roller lever, 46...Connecting rod, 47...Lever block, 48 ...Compound lever, 50
...Shaft, 52...Air cylinder, 55...
Pressure gauge.

Claims (1)

[Scope of utility model registration request] A pitch cam, a cam roller lever that swings following the pitch cam, a compound lever that swings in contact with the cam roller lever, and a mechanism whose one end is attached to the compound lever and whose other end provides reciprocating motion to the pitch tool. In a pitch mechanism of a coil spring manufacturing apparatus consisting of a pull rod linked to a pitch cam, an air cylinder is provided to maintain the follow-up response of the pitch tool to the pitch cam, and the pressure of compressed air supplied to the air cylinder is maintained at a predetermined pressure. Pitch mechanism for coil spring manufacturing equipment with a pressure gauge provided for setting.