JPH0340442Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is based on a coil spring manufacturing machine that continuously manufactures coil springs with hooks at both ends in one cycle of the machine. This invention relates to a device for aligning hooks in a coil spring manufacturing machine to align them in a constant relationship and prevent variations in opposing positions.

Coil springs with hooks at both ends manufactured using coil spring manufacturing machines generally have slight variations in the diameter of the formed coil spring due to uneven diameters of the materials used, wear of forming tools, etc., and slight errors in the material feed length. arise,
Even if the opposing position is initially set to a predetermined value,
There is a drawback that the opposed positions of the coil springs produced gradually vary over time.

However, in recent years, various dimensions of precision springs used in precision industrial equipment require high precision, and high precision is also required for the opposing positions of the hooks at both ends. Without it, the finished product is often not viable. For this reason, even though a machine has appeared that can form both end hooks and the coil body in one process, one hook and the coil body are made by machine, and the other hooks are made by hand using tools. At present, the opposing positions are made uniform by a method. In view of the above, the applicant has proposed a method for winding a coil spring by extruding a wire from a wire guide quill, pressing the wire into various forming tools, and winding the wire into a coil body using a coil body forming tool. A sensor that generates a signal when it comes into contact with the first hook of the coil spring is provided in front of the coil spring being wound during forming, and the sensor generates a signal. He developed a device that created a second hook by replacing it with a second hook forming tool and aligned the opposing positions (for example, the
-35032) The present invention relates to an improvement for more reliably operating the device for aligning the opposing positions.

First, a conventional method for manufacturing a coil spring will be outlined with reference to FIG. 1, which is a schematic diagram of the device. The forming tools are shown as one set of coil body forming tools (other forming tools are omitted), and the gear 10 is connected to the drive source _M1.
Gears and the like located intermediate from the driving source M ₂ to the cams 24 and 26 are omitted. Drive force is now transmitted from the drive source _M1 according to a command from the control device 12, and the gears 10 are engaged with each other.
When the gear 14 rotates, the coaxial material feed rollers 16 and 18 are also rotated in opposite directions, and the rotational force causes the force to forcefully eject the wire W forward through the hole of the wire guide quill 20. Become. In addition, the drive source is controlled by a command from the control device 12.
Driving force is transmitted from _M2 , and as the cam 24 rotates, the coil body forming tool 22, which has a U-groove cut in front of the quill 20, moves the wire W to an inclined position. When held at that position, the wire W fed out from the quill 20 is moved to the coil body forming tool 22.
It comes into contact with the coil and is formed into a coil shape. The first hook, coil body, and second hook are formed by appropriately positioning various forming tools in front of the quill 20 in the same manner as described above. (FIG. 1 shows a state in which a first hook is formed with a first hook forming tool and then a coil body is formed with a coil body forming tool). In the spring forming process described above, the wire is continued to be fed in the state shown in FIG. 1 until the coil body is wound up to the desired number of coil turns. Here, when the coil body is wound a little before the predetermined number of coil turns, the cam 26
The signal sends an operation command to the solenoid 30 of the detector 28, and the detection rod 32 is advanced to a position in front of the first hook in the direction of movement of the first hook, which moves forward while rotating laterally from the quill part during coil body forming, and waits to stop. Then, as the detection rod 32 comes into contact with the first hook, the position of the first hook portion is detected, and at that point, the wire feed is stopped by a signal from the detection rod 32.
This is to obtain the opposing position of the setting. Note that after the wire is stopped, if the second hook is formed using a normal coil spring forming method, a coil spring with aligned facing positions can always be wound. put it here,
The conventional mechanism described above has the following drawbacks because the cam 26 determines the timing of the operation of the detection rod 32. FIG. 5 is a view of the coil spring while the coil body is being formed, as seen from the first hook side. Because the detection rod 32 comes into contact with the first hook, its tip reaches inside the coil body when viewed from the side. Since the detection rod 32 moves forward, the position of the first hook during molding of the coil body can be adjusted so that the center of the movement is centered at the point ○A shown here. It is clear that whatever position the first hook is located, the first hook will eventually be able to rotate and come into contact with the detection rod 32. Therefore, when adjusting the mounting position of the cam 26, the operator attempts to locate the center of the dispersion at this point, but this work relies solely on the operator's intuition. Therefore, this positioning depends on the skill and dexterity of the worker, and since it is necessary to increase the rotation speed of the spring manufacturing machine to increase the number of pieces produced, it is necessary to set the variation within the range of ○○○ above. It is extremely difficult to position the first hook during forming the coil body, as shown in Figure 6, which shows the coil spring during forming the coil body as seen from the first hook side. If there is a variation in the setting, and if the variation occurs in the range marked with ○ in Figure 6, the detection rod 32 will be off by half a turn when detecting the first hook, and this will occur during spring manufacturing. A spring whose opposing position of the hook part is shifted by half a turn is mixed in with the product, and it is virtually impossible to judge whether these are good or bad, and all manufactured products are treated as defective. Something happened.

The present invention has been developed in view of the above-mentioned drawbacks, and an embodiment of the present invention will be described with reference to an enlarged view of the detector 28 in FIG. The present invention uses this device to confirm contact between the first hook and the detection rod 32 at a scheduled time, and will be described in detail below. Two parallel support plates 34, 34 and lower plate 3
The solenoid 30 is mounted on the lower plate 36 of a U-shaped holding frame 38 consisting of 6, and the detection rod 32 is fixed to the tip of the operating shaft 40 of the solenoid 30. Then, electrical wiring is performed from the detection rod 32 to the control device 12, and the drive source M ₁ is activated by this electrical signal.
The configuration is such that it transmits a stop signal. The above operating axis 4
0 is made to be able to move forward and backward by passing through a hole 42 in the support plate 34, and a stop plate 44 that comes into contact with the support plate 34 when moved forward by the action of the solenoid 30 is fixed to the central part of the support plate 34. 34 and stop plate 44
The detection rod 32 is positioned in front of the first hook of the coil spring that is being wound in the direction of movement. Further, a contact plate 46 is fixed above the stop plate 44, and is opposed to a compression spring 52 having a weak elastic force, which is installed on a mounting plate 50 fixed above the support plate 34 of the holding frame 38 via an insulator 48. . FIG. 2 shows a state in which the detection rod 32 is retracted, and when the operating shaft 40 is retracted, the contact plate 46 and the compression spring 52 are separated.

On the other hand, the operating shaft 40 advances due to the action of the solenoid 30, and just before the detection rod 32 is positioned forward by the contact between the stop plate 44 and the support plate 34,
The abutment plate 46 contacts the compression spring 52 and further presses the compression spring 52 in the forward direction of the operating shaft 40. However, since the compression spring 52 has a weak elastic force, it is only compressed and cannot perform a positioning action. has no effect. Here, electrical connections are made from the mounting plate 50 to the control device 12 as shown in the block diagram of FIG. 3, which shows an example of the control device. Therefore, just before the detection rod 32 moves forward under the action of the solenoid 30 and the stop plate 44 comes into contact with the support plate 34, the contact plate 46 and the compression spring 52 come into contact with each other.
The contact signal is transmitted from the contact plate to the arithmetic circuit via the mounting plate 50. From the time when this signal is received until the detection rod 32 comes into contact with the first hook of the coil spring being wound, the wire feed amount from the quill 20 is determined by a pulse generator provided on a shaft synchronized with the feed rollers 16 and 18, for example. count as the number of pulses.
FIG. 4 is a diagram showing the relationship between the line feed and the timing of the detector 28. Now, the coaxial material feeding feed roller 1 is rotated by the wire feed cam rotated by the driving force from the drive source M ₁ in response to a command from the control device 12.
6 and 18 are turned in opposite directions, and the rotational force causes the wire W to be rotated in the wire guide quill 20.
It is emitted forcefully forward through the hole. In addition, driving force is transmitted from the drive source M ₂ according to a command from the control device 12, and as the cam rotates, various forming tools having a U-groove cut in front of the quill 20 are appropriately moved to a position inclined to the wire W. do. At that position, first
When the hook forming tool is held, the wire rod W sent out from the quill 20 comes into contact with the first hook forming tool, and the curve of the first hook is formed (area a shown in Fig. 4).Subsequently, the first hook forming By replacing the tool with the coil body forming tool and positioning it in front of the quill 20 in the same manner as described above, the coil body following the first hook is formed. In the process of forming the coil body shown above, the drive source M ₁ initially feeds the wire W from the quill 20 at high speed in response to a command from the control device 12 instead of the wire feed cam (b shown in FIG. 4).
Region) Then, by feeding the wire W from the quill 20 at a low speed (region c shown in FIG. 4), the coil body is wound in sequence. Here, when the coil body is wound to a point just before the predetermined number of coil turns, a signal from the sensor actuation cam 26 that is timed at that time sends an operation command to the solenoid 30 of the detector 28, and the coil The first part moves forward while rotating laterally from the quill part while forming the body part.
The detection rod 32 is advanced to the forward position in the direction of movement of the hook, and at the same time as the detection rod 32 is stopped and waiting, measurement of the line feed pulse amount is started by the contact between the contact plate and the compression spring, and the detection rod 32 eventually comes into contact with the first hook. detects the position of the first hook part, and at that point, the wire feed is stopped by a signal from the detection rod 32, and at the same time as the set facing position is obtained, the measurement of the wire feed is stopped and the detection rod 32 is moved forward. The amount of feed of the wire from when it comes into contact with the spring until it comes into contact with the first hook is measured, and this counted amount is sent to the comparison circuit, and this count amount is set as the upper limit of the number of wire feed amount counts predetermined by the setting device. A comparator circuit compares whether the value is between the lower limit and the lower limit, and if it is within the set value, the signal is taken out as a non-defective signal. Furthermore, if the count amount is larger than the upper limit when compared by the comparison circuit, it means that the detection rod 32 has come into contact with the first hook in a state where the coil body is overwound due to too large a wire feed amount, and the opposite position This is because the free length of the wound coil spring with the lines aligned is longer than planned, and on the other hand, if the count amount is less than the lower limit value as compared by the comparison circuit, then the detection rod 32 is 1 hook, and the free length of the wound coil spring with opposing positions aligned was wound in a state shorter than planned, and both signals were taken out as a defective signal, and when the coil spring was wound. It is possible to detect abnormalities in moreover,
Even if a defective coil spring is wound due to a timing shift in the movement of various forming tools toward the front of the quill arranged on a plane perpendicular to the material feeding direction, the wire feed count may exceed the upper limit of the set value. Since the signal does not fall within the lower limit, it is possible to extract the signal as a defective signal. After stopping the wire rod, replace the coil body forming tool and position the second hook forming tool in front of the quill 20.
The coaxial material feed rollers 16 and 18 are rotated in opposite directions by the wire feed cam to feed the wire W from the quill 20 and form the second hook. (Area d shown in FIG. 4) As a result, a coil spring with aligned opposing positions can be wound. As a result, as shown in FIG. 7, after the detection rod 32 advances to the standby position where it comes into contact with the first hook, the wire rod in the coil body is fed by the number of pulses corresponding to By outputting a non-defective signal only for those products that come into contact with the detection rod 32 after the test, products that correspond to this signal are treated as non-defective products, and products outside this range are a mixture of defective and non-defective products, but are considered defective. When a non-defective product signal is issued, products corresponding to this signal are discharged, so that coil springs with the same number of turns and facing positions on the coil body can be detected and produced. As explained above, according to the device of the present invention, in a device for aligning opposing positions of a coil spring manufacturing machine, positional deviation occurs when the number of turns of the coil body deviates by half a turn from the planned number of turns due to poor contact of the detection rod. In addition to the above, it is also possible to detect molding abnormalities in coil springs at the same time, and when these abnormalities occur, the signals extracted as defective signals are used to extract only good products with aligned facing positions from the manufacturing machine. Therefore, it is possible to effectively manufacture coil springs in which the facing positions are aligned.

[Brief explanation of drawings]

Fig. 1 is a skeleton diagram outlining the conventional manufacturing method for coil springs, Fig. 2 is an enlarged view of the detector, Fig. 3 is a block diagram showing an example of the control device, and Fig. 4 is wire feeding and detection. FIGS. 5, 6, and 7 are diagrams showing the timing with respect to the coil body 28, as viewed from the first hook side. 12...control device, 20...quill, 28...
Detector, 30... solenoid, 32... detection rod,
46...Packing plate, 52...Compression spring.

Claims (1)

[Scope of utility model registration request] A coil spring manufacturing machine with a hook that manufactures coil springs using a plurality of forming tools that are arranged on a plane perpendicular to the material feeding direction and operate so as to move toward the material, and the coil body forming tool is used to produce coil springs. In front of the coiled spring in the direction of movement,
In a device that is provided with a detection rod that generates a signal by contacting the first hook of the coil spring that is being wound up, a compression spring that detects the movement of the detection rod by contact with the first hook, and a contact between the compression spring and A calculation circuit that calculates the line feed amount from contact detection to the contact signal with the first hook with the detection rod, and a comparison that compares the line feed amount from the calculation circuit with the set value with upper and lower limits set in advance. A defect detection device for a hook portion alignment device of a coil spring, which has a circuit and detects an abnormality by generating a good/bad signal through comparison in a comparison circuit.