JPS6359777B2 - - Google Patents

Description

Detailed Description of the Invention This invention relates to a coil spring manufacturing machine that continuously manufactures coil springs having straight, circular, or other hooks at both ends in one cycle of the machine. The present invention relates to an automatic alignment device for hooks at both ends of a coil spring, which aligns the opposing positions (hereinafter referred to as opposing positions) in a constant relationship and prevents variations in the opposing positions.

Coil springs with hooks at both ends manufactured using coil spring manufacturing machines generally suffer from minute changes in the diameter of the formed coil spring due to uneven diameters of the materials used, uneven surface treatment, wear of forming tools, etc. Even if the opposing position is initially set to a predetermined value due to a slight error in the material feed length, the opposing position of the coil spring manufactured over time will gradually change in the direction in which the number of turns increases (hereinafter referred to as the positive side). ) or the number of turns decreases (hereinafter referred to as the negative side),
The disadvantage is that it can vary. However, in recent years, precision springs used in precision industrial equipment are required to have high precision, and not only the relationship between elongation with respect to load and the lifespan varies, but also the opposing positions of the hooks at both ends have a high precision of within ±5°, preferably 0°. When using coil springs using thicker wire, when hooking both ends to various devices with hooks at both ends, if the opposite positions are misaligned, the hooks may be damaged. In some cases, it was no longer possible to twist and hook the hooks by hand, and the finished product would not work unless the hooks were placed in opposite positions. For this reason, although a machine has appeared that can form both end hooks and the coil part in one process, one hook and coil body are made by machine, and the other hooks are made by hand using tools. The current attempt to equalize the positions is inefficient. For this reason, the applicant developed a device for aligning the opposing positions in Japanese Patent Publication No. 52-11306 and Japanese Patent Publication No. 53-35032, but recently a machine that can produce coil springs with a longer coil body than before has been developed. In the technique disclosed in the above publication, as the number of turns of the set coil increases, the detection rod (detection A drawback has arisen that causes the inconvenience that the head) may detect the hook. In other words, when a coil spring is actually wound with a spring manufacturing machine, the relative angle between the hooks at both ends of the produced coil spring is 1.5 times the number of turns of the coil body of the coil spring formed around the initially set angle. The spring manufacturing machine produces coil springs by producing variations in the relative angles of the hooks at both ends within the angle range from the positive side to the negative side by the above angle. things happen. For example, when winding a coil spring with 40 turns in the coil body, 40 x 1.5 = 60 Therefore, as shown in the diagram of the coil body viewed from the hook of the coil spring with hooks at both ends shown in Figure 1. The hook part will vary within the range of ±60°.
(The position of the hook shown by the solid line is the first set position.) However, in this case, if the detection rod is operated within the detection rod operating range angle shown in Fig. 1 using the conventional device for aligning opposing positions, the position shown in Fig. 3 is Since the detection rod (detection head) is always in contact with, for example, the part a shown in the side view of the coil spring with hooks at both ends, it is possible to align the opposing positions.

Next, if we consider the case where the required coil body increases to a coil spring with 80 turns, 80 x 1.5 = 120 Therefore, as shown in Figure 2, the hook part should have variations within a range of ±120°. When detecting the hook part with a conventional device for aligning opposing positions, despite the setting of aligning the opposing positions by bringing the detection rod (detection head) into contact with part a shown in Fig. 3, due to variations, +
If it deviates by 120° or -120°, there will be a timing lag in which the detection rod (detection head) comes into contact with part b, and as a result, the hook will be deviated by half a turn (±180°) from the predetermined hook position, and the hook will be aligned. There will be times when you will have to put it away.

The present invention has been made in view of the above. That is, in the present invention, two or more detection rods (two locations) for detecting the hook position are provided, and the opposing positions are measured, the coil body is divided, and the coil body is wound while adjusting the number of turns each time. For example, when winding a coil spring with hooks at both ends with 80 coil turns, if the hook part is detected after winding the 40-turn coil body as shown in Figure 1, the hook part is detected. When doing so, it is possible to detect the hook position of a stable predetermined number of coil body turns, and therefore the next remaining hook position can be detected.
Even when winding a 40-turn coil body, since winding starts from a predetermined hook position, detection can be made at the hook position of the predetermined number of coil body turns.
Detection of the hook portion by the final detection rod after winding the coiled coil also makes it possible to obtain a stable coil spring with a predetermined number of turns and with the opposing positions of the hook portions aligned.

Hereinafter, an example of the present invention will be explained with reference to the drawings. FIG. 4 shows the material feed roller drive mechanism, in which the pulley 1 of the electric motor M is connected to the pulley 4 of the shaft 3 via the belt 2.
The gear on the shaft 3 meshes with the gear 7 on the shaft 6, and the gear 8 on the shaft 6 meshes with the crank gear 9. The crank gear 9 is fixed to a camshaft 10, and a crank pin 11 is eccentrically implanted at the outer end. The crank pin 11 is fitted into a guide groove 15 of an arm 14 projecting from one end of the segment gear 13 of the rocking shaft 12. That is, the crank gear 9 and the segment gear 13 constitute a crank mechanism, and the rotation of the crank gear 9 causes the segment gear 13 to swing. The segment gear 13 meshes with a clutch gear 16, which is secured to an index clutch 17;
The clutch shaft 18 is rotated by the amount by which the segment gear 13 swings in one direction. An electromagnetic clutch brake 19 is attached to the other end of the clutch shaft 18 as an example of a material feed control device, and the intermittent rotation of the clutch shaft 18 is controlled by an external "on" and "disconnect" electric signal.
Transmitted or blocked. The joint shaft 20 and the feed shaft 21 are connected by a pair of gears 22, and are connected by a pair of gears 23 having the same number of teeth on the pair of feed shafts 21, and the pair of material feed rollers 24 are moved in the same direction in opposite directions. Rotate at speed. Note that the material feed roller 24 is for pinching the material, and the material feed length can be adjusted arbitrarily by changing the eccentricity of the crank pin 11 of the crank gear 9 or by changing the ratio of the number of teeth between the pair of gears 22. can be selected. In addition, although an example has been shown in which a material feed control device is incorporated into the material feed roller drive mechanism, the material feed control device may be implemented using other methods as long as it controls the material feed.
A method of controlling by incorporating a device or a method of simply controlling the clamping pressure of a pair of material feed rollers may be used. On the other hand, the camshaft 10 is provided with a cutting cam 25, a timing cam 26, a helical gear 27, and a coil forming cam 28, and a camshaft 29 perpendicular to the camshaft 10 is provided with a first hook forming cam 28. A cam 30 and a second hook forming cam 31 are provided sandwiching a helical gear 32, and the two helical gears 27 and 32 mesh with the same number of teeth, and both cam shafts 1
0,29 rotate at the same speed. In addition, the timing cam 26 is connected to a limit switch 3 fixed to the machine frame.
3, the limit switch 33 connects and disconnects the electromagnetic clutch brake 19.

FIG. 5 shows the arrangement of a plurality of forming tool holders, and a structure 35 is installed in front of the front plate 34 of the machine frame that accommodates the material feed roller drive mechanism and various cam groups. Forming tool holders 36, 37, and 38 are pivotally supported on the structure 35 by support shafts 39, 40, and 41, respectively. Further, a gate-shaped support piece 42 is attached to the front plate 34 of the machine frame, and the support piece 42 supports a material cutting tool assembly and a detection section to be described later. Structure 35
A material guide 43 is removably provided in the center.
Each forming tool holder 36, 37, 38 is connected to the support shaft 3, respectively.
When viewed from 9, 40, and 41 and swung counterclockwise, the forming tool 44 fixed to the tip will move from right to left, the forming tool 45 will move from top to bottom, and the forming tool 46 will move from left to right. While drawing, cross in front of the material guide tool 43.

The forming tool 44 is used for forming the first hook, the forming tool 45 (FIG. 6) is used for forming the coil body, and the forming tool 46 is used for forming the second hook.

FIG. 7 is a perspective view of the detection unit (in this embodiment, two detection rods are attached), and shows the left and right gate-shaped support pieces 42.
A guide bar 48 is horizontally suspended through a guide 47, and a plurality of guide bars (first detection section and second detection section from the upper left in FIG. 7) are installed so that the guide bar surface can be slid.
The bases 49, 49' of the base blocks 50, 5
Retained by 0'. A solenoid 51, 51' is fixed on each base, and a connecting bar 52, 5
One end of 2' is connected to a plunger of a solenoid 51, 51', and a stopper 53, 53' is attached to the other end. Further, a bearing 54 fixed on the base,
The rear end portions of insulating sleeves 56, 56' which are slidable within the holders 55, 55' of 54' are fixed to the stoppers 53, 53'. Further, the insulating sleeves 56, 56' hold the detection rods 57, 57' via an insulator, and springs 59, 57' are provided between the stoppers 53, 53' and pins 58, 58' provided on the base.
9' will be constructed. As a result, the detection rods 57, 57' can be moved up and down by moving the base blocks 50, 50'.
It is possible to adjust the left and right positions in the front-rear direction by adjusting the mounting positions of the stoppers 53, 53' and the insulating sleeves 56, 56'. In addition, the solenoid 51,
51' and the detection rods 57, 57' to the control box, the electromagnetic clutch brake 1 is activated by an electric signal.
Turn 9 ON and OFF. On the other hand, as shown in FIG. 8, the coil spring to be formed is formed into a first hook by a first hook forming tool 44 (FIG. 8 A), and then a coil portion forming tool 45 is used to form a first hook against the axis of the material guide tool 43. The coil body is formed by bending it in an approximately orthogonal direction. (Figure 8B) At this time, each detection rod 5
The coil springs 7 and 57' are sequentially given an electric signal to the solenoids 51 and 51' just before the first hook portion comes to the front, and move forward from the bearings 54 and 54', eventually coming into contact with the first hook. Therefore, an electric signal is transmitted from the first hook to the detection rods 57, 57', and this signal stops the material feeding.
At 7', the hook position is adjusted. This adjusts the number of turns of the coil spring. (Figure 8 d, d)
Furthermore, by adjusting the position and angle of the detection head 57', it is possible to control the detection head 57' to a desired opposing position. Further, when the tip of the detection rod comes into contact with the coil spring, an electric signal is transmitted to operate the electromagnetic clutch brake 19. The detection rod may be one that contacts a coil spring to conduct electricity, a highly sensitive microswitch, or a phototube type.

Each forming tool holder 36, 37, 38 is connected to and controlled by a cam 30, 28, 31 via a link mechanism, respectively. This will be explained with reference to FIG. 6, taking as an example the forming tool holder 37 holding the coil portion forming tool 45.

As described above, the forming tool 45 of the coil portion is held at the tip of the forming tool holder 37, and the connecting rod 60 and the tension spring 61 are attached to the tail end. Connecting rod 60
is pin-coupled to one end of the push lever 62, and the other end of the tension spring 61 is attached to the rear wall of the machine frame. The push lever 62 can swing around a shaft 63, and the cam lever 64
can swing around the shaft 65. and push lever 6
2 and the cam lever 64 are connected by a member 66. A cam roller 67 is rotatably attached to the cam lever 64 and is pressed by a tension spring 61 onto the outer periphery of the cam 28 which rotates as the camshaft 10 rotates. Therefore, by the link mechanism, the forming tool holder 3
7 swings about a support shaft 40 by a cam 28. Similarly, the forming tool holder 3 is
6 is swung by a cam 30, and the forming tool holder 3
8 is oscillated by a cam 31.

Next, the operation of the present invention will be explained. First of all, the 9th
The diagram explains the operating timing of each part.
is the cam 3 of the forming tool 44 that forms the first hook portion.
0 operation is the forming tool 45 that forms the coil part.
The operation of the cam 28 is the operation of the cam 31 of the forming tool 46 for forming the second hook part, C is the operation of the material cutting tool by the cam 25, and F is the operation of the material feed roller 2.
4 indicates the operation, and T indicates the operation of the timing cam 26.

Crank gear 9 and camshaft 1 at the start of material feeding
The segment gear 13 is unidirectionally oscillated by the crank gear 9 and the camshaft 1, with the initial position of 0 and 29 being 0 degrees.
The rotation angle of 0,29 is performed between 0° and 270°,
Return quickly at the remaining 90° from 270° to 360°. Once the material begins to be fed, the forming tool 44 advances horizontally across the front surface of the material guide 43, pivots the material horizontally to form the first hook portion, and retreats to its original position. (See line) Subsequently, the forming tool 45 is lowered vertically across the front surface of the material guide 43 to swirl the material and form a coil portion. (See line) As the number of turns in the coil section increases, the first hook moves forward while pivoting, increasing the length of the coil section.

Shortly before the predetermined number of turns of the coil body of the front half is reached, an electric signal is sent to the solenoid 51 of the first detection section to actuate the connecting bar 52 against the spring 59. 54, and the first hook eventually comes into contact with the tip of the detection rod 57 held in the insulating sleeve. (FIG. 8C) At that moment, an electric signal is generated, the electromagnetic clutch brake 19 is cut off, the material feed roller 24 stops rotating, and material feeding is temporarily interrupted. At this time, the forming tool 45 for forming the coil portion is still in the forming state. (And see line F) Next, the electric signal of the solenoid 51 is cut off, the detection rod 57 moves backward by the force of the spring 59, and then the timing cam 26 pushes the limit switch 33, which emits an electric signal and the electromagnetic clutch brake 19 is activated again. Connection is made and material feeding is resumed. (See F and T lines)
Therefore, the second half of the coil body is formed, and just before reaching the predetermined number of turns, the solenoid 5 of the second detection section
An electric signal is sent to the detection rod 1', and it performs the same operation as the first detection part (Fig. 8D).
7', material feeding is interrupted. At this time,
The forming tool 45 for forming the coil portion is still in the forming state. Next, the electrical signal of solenoid 51' is cut off,
When the detection rod 57' moves backward, the cam roller 67 of the cam lever 64 moves toward the cam 2 due to the rotation of the cam shaft 10.
Immediately after the coil portion forming tool 45 starts to retreat, the second hook forming tool 46 advances horizontally across the front surface of the material guiding tool 43 by the cam 31, and horizontally turns the material being formed. , mold the second hook part.

Meanwhile, at the same time, the timing cam 26 pushes the limit switch 33 and issues an electric signal, and the electromagnetic clutch brake 19 is connected again, restarting material feeding (see lines , F and T). The timing to start winding the second half of the coil body after finishing winding the second half of the coil body and the material feeding are interrupted, and the forming tool 45 for coil forming is interrupted.
After retracting, the material feeding is started at the same time as the second hook forming tool 46 completes its advance.
When the second hook part forming is completed, the material feeding is also completed, and then the material cutting tool advances to the front of the material guiding tool 43 by the cam 25 and cuts the formed coil spring (see line C). In this way, one cycle of the spring forming process is completed. The position of the detection rods 57, 57' can be freely selected, and the position of contact with the first hook can be adjusted.

As explained above, according to the present invention, a plurality of detection rods are used to sequentially detect the hook portion of the coil spring being formed, so that when winding a coil spring with a long coil body, the attached coil There is no variation in the opposed positions of the hook parts due to the influence of minute changes in the spring diameter or the influence of minute errors in material feeding from the start of forming the first hook part to the end of forming the coil body. Therefore, it is possible to manufacture a uniform coil spring with a predetermined number of coil turns and less variation in the opposed positions of the hooks at both ends. Additionally, the position of the detection rod can be adjusted freely, making it easy to change the production of coil springs with different dimensions. Although the embodiment has been described using two detection rods, it goes without saying that three or more detection rods may be used depending on the manufactured coil spring.

[Brief explanation of drawings]

Figures 1 and 2 are views of the coil body seen from the hook part of the coil spring with hooks at both ends, Figure 3 is a side view of the coil spring with hooks at both ends, and Figures 4 to 9.
The figures show an embodiment of the present invention, Fig. 4 is a plan view showing the material feeding drive mechanism, Fig. 5 is a front view showing the arrangement of the spring forming tool holder, and Fig. 6 is the link between the spring forming tool and the cam. Fig. 7 is a side view showing the mechanism, Fig. 7 is a perspective view of the detection part showing the operating mechanism of the detection rod, Fig. 8 shows the molded state of the coil spring and the positional relationship with the detection rod, and A shows the position of the first hook. The molding state, B shows the molding state of the coil body, C and D show the molding state of the coil body and the positional relationship of the first detection section and the second detection section, and FIG. 9 is an operation timing diagram of each part. . 24...Material feed roller, 26...Timing cam, 33...Limit switch, 51...Solenoid, 56...Insulating sleeve, 57...Detection rod.

Claims (1)

[Claims] 1. In a coil spring manufacturing machine that manufactures a coil spring with hooks at both ends by operating a plurality of forming tools so as to approach the material sent out from the material guide, the coil body is formed by the coil body forming tool. A guide bar is installed in front of the material guide of the coil spring manufacturing machine in parallel with the axis of the body of the coil spring to be formed, and the coil body attached along the guide bar rotates during forming. The plurality of detection rods are composed of a plurality of detection rods that detect the first hook portion of the coil spring to be formed while moving, and a material feed interruption mechanism provided in the drive section for feeding the material from the material guide. A detection signal from the first hook portion of each of the detection rods is transmitted to the material feeding interrupting mechanism to temporarily interrupt the material feeding, and a timing signal in accordance with the driving of the plurality of forming tools is transmitted to the material feeding interrupting mechanism to stop the material feeding. By restarting the feeding, a long coil body is formed while adjusting the position of the first hook with respect to the coil body, and finally the relative positions of both end hooks of the coil spring having a long coil body are set at a constant position. An automatic alignment device that hooks both ends of a coil spring.