JPS6020104B2 - Position correction device for pitch tool in coil spring manufacturing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a position correction device for a pitch tool in a coil spring manufacturing machine, which measures the manufacturing length of a coil spring at an appropriate number of measurement points during the intermediate process of manufacturing the coil spring and before cutting the completed coil spring. This invention relates to a pitch tool position correcting device for a coil spring manufacturing machine, which measures the position of the pitch tool each time and corrects the position of the pitch tool so that the coil spring has a regular length.

Traditionally, coil spring manufacturing machines have been
As shown schematically in some of the figures, the spring wire 1
The spring wire rod 1 is forcibly fed out through the guide 4 by the feed rolls 2 and 3, and the spring wire rod 1 is brought into contact with the restrainer 5 and driven onto the winding rod 6.

When the coil spring 7 around which the spring wire rod 1 is wound is not tightly wound but wound around the coil spring 7, a variable pitch tool, usually called a pitch tool 8, is installed on the winding rod 6. During winding, the spring wire rod 1 being wound up is compressed in a direction transverse to its traveling direction, and when the spring wire rod 1 constituting the coil is driven into the winding rod 6, it is compressed against the adjacent wound spring wire rod 6. It is manufactured in such a way that it does not come into close contact with 1. However, when winding the coil spring 7 sparsely, the pitch of the coil changes even if the pitch tool 8 is kept at a constant position due to the winding tendency of the spring wire 1, surface roughness, scratches, and many other factors. This may cause differences in the overall length even if the number of turns is the same.

In such a case, product uniformity cannot be obtained, so when the coil spring 7 is configured with a specified number of turns, the pitch tool 8 should be retracted when the pitch becomes coarse and the overall length becomes longer than the specified dimension. However, when the coil spring 7 with the specified number of turns is constructed, if the pitch becomes thinner and the overall length becomes shorter than the specified value, the pitch tool 8 is pushed out to coarsen the pitch of the coil spring 7. . To make this pitch tool 8 appear,
Conventionally, the sensor 9 is installed on the end side of the coil spring 7, and when the coil spring 7 is completed and just before being cut, the tip of the coil spring 7 and the sensor 9 are connected.
This sensor 9 detects the capacitance existing between the
For example, if this capacitance is larger than a preset value, a signal is sent to the brass side to cause the pitch tool 8 to protrude, and if it is smaller than the preset value, a signal is sent to the negative side to cause the pitch tool 8 to protrude. What makes you withdrawn is
It exists as a so-called feedback method.

However, in the conventional feedback system described above, the capacitance is detected after the coil spring 7 is completed and immediately before cutting, and when the capacitance is not within a specific range, the pitch tool 8 is actuated, thereby controlling the next time. When manufacturing the coil spring 7, the coil spring 7 is manufactured with a pitch different from the previous one, and for this reason, the coil spring 7 whose capacitance is not within a specific range is produced as a so-called defective product. This resulted in an increase in the amount of defective products produced. Therefore, the present invention has been created in view of the above-mentioned points, etc., and its gist is that in a coil spring manufacturing machine, when the coil spring is wound, the winding start end moves forward.
A sensor is placed to measure the capacitance that exists between the winding start end and itself, and one or more sensors are installed at the passing position of the winding start end from when the coil spring starts to winding until it is completed. A measurement point is set at each cutting position, a set value of the capacitance existing between the winding start end and the sensor at each measurement point is set in advance, and this set value and each measurement point by the sensor are set in advance. Compare the actual measured value of capacitance at The invention consists in the provision of a detection control device which immediately moves the pitch tool of the coil spring manufacturing machine in response to the generated signal to correct the pitch of the coil spring. Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In the figure, reference numeral 1 denotes a spring wire rod, and as mentioned above, the coil spring 7 is manufactured by a coil spring manufacturing machine comprising feed rolls 2, 3, a guide 4, a restrainer 5, a winding rod 6, a pitch tool 8, etc. be.

In this case, the coil spring 7 shown in the figure is currently being manufactured or has been manufactured. In addition, 9 in the figure is a sensor placed in front of the movement of the winding start end of the coil spring 7.
The capacitance between the winding start end of the coil spring 7 and the sensor 9 is measured.

Further, 10 is a cutter, and by cutting the coil spring 7 from this cutter 1, the coil spring 7 is removed.
The entire manufacturing process is completed. That is, the period between the operation of the cutter 10 and the next operation is an intermediate manufacturing process, and the time when the cutter 10 is activated is the time when the coil spring 7 is completed. A cutter operating cam 12 is fixed to the base rotating shaft 11 for operating the cutter 10, a swinging body 17 holding the cutter 10, a lever bar 14,
The cutter 10 is actuated by the actuator 13 via the receiving roller 15 and the link 16.

That is, when the base rotating shaft 11 rotates at a constant speed and the operating portion 13 of the cutter operating cam 12 presses the receiving roller 15, the bar 14 operates, and the swinging body 17 rotates from the link 16, causing the cutter 10 to move. Step 3 is for cutting the coil spring 7, and this step is considered a final cutting step. The base rotation shaft 11 rotates once at a constant speed between the operation of the cutter 10 and the next operation, and also rotates as the coil spring is manufactured.

A rotational position detection board 18 is fixed to this base rotating shaft 11, and one movable contact 19 is provided protruding from the rotational position detection board 18. Further, around the rotational position detection plate 18, there are a first contact 20, a second contact 21, a third contact 22 at the positions where capacitance is to be measured in the manufacturing process of the coil spring 7, and as shown in FIG. The fourth contact 2 is located at the position where the capacitance is measured in the final cutting process in which the cutter 10 is operated.
3 will be provided. During the movement of the winding start end during the manufacture of a coil spring, the position at the moment when the movable contact 19 contacts the first dovetail point 20 to the third contact point 22 during movement is used as a measurement point to measure the coil spring 7 being manufactured. Determine the capacitance between the tip and the sensor 9.

This measured value and the first contact 20 to the third contact 22
When the movable pseudo point 19 contacts the first contact 20 to the third contact 22, the preset value is compared with the set value set in advance as the best condition for the capacitance at If the measured value differs from the actual value or is outside the set value range, calculate whether the difference or the value outside the set value range is positive or negative, and the amount of the difference. Based on this, the pitch tool 8 is moved in and out during the manufacturing process of the coil spring by feedback control, and the length of the coil spring during this manufacturing process is made to match the specified length each time. Then, during the completion cutting process, the movable contact 19 comes into contact with the fourth coin point 23, so that the total length of the completed coil spring matches the designated value, similar to the intermediate process described above. Note that the mounting positions of the movable contact 19 and the first to fourth contacts 23 may be reversed, or the movable contact may be used as a pusher and the contacts may be used as limit switches. Next, the configuration for operating the pitch tool based on the set values of each of the capacitances above and the actual values measured is briefly explained as follows with reference to FIGS. 3 and 4. It is.

First, in FIG. 4, reference numeral 24 denotes a measurement position detection device, which is comprised of the aforementioned rotational position detection plate 18, movable contact 19, first contact 20 to fourth contact 23, and the like.

Reference numeral 25 denotes a central processing unit composed of, for example, an integrated circuit or a large-scale integrated circuit, and is generally abbreviated as CPU.

26 is the first set value input, 27 is the second set value input, 28 is the third set value input, and 29 is the fourth set value input, and these set value inputs are the numerical values of the best condition set in advance. This setting value is equivalent to computer software, and is a digital value.

Further, 30 is an analog-to-digital converter that converts an analog display into a digital display, and although the capacitance measured by the sensor 9 is expressed in an analog display, it is difficult to input it to the CPU 25 as it is due to the presence of fractions. The measurement position detection device 24, CPU 25, analog-to-digital converter 30, etc. form a detection control device. In reality, if the moment when the movable contact 19 and the first contact 20 in the measurement position detection device 24 come into contact is defined as the first measurement point, the first measurement point during the coil spring manufacturing process
At the measurement point, the sensor 9 measures the capacitance between the coil spring and the coil spring that is being manufactured.

If the actual measured value of this capacitance is 102, and if the setting value of the first setting value input 26 is 100, then
This creates a difference of +2. Therefore, the CPU 25 generates, for example, a two-pulse signal to operate the pulse motor 32 that moves the pitch tool 8 in and out by an amount corresponding to this plus two. Even if this two-pulse signal is sent as is to the pulse motor 32, the amount of operation of the pulse motor 32 may become too small or too large. Therefore, a pulse converter 31 is interposed between the CPU 25 and the pulse motor 32, and this pulse converter 31 has a pulse multiple indicator 44.
is attached to adjust the amount that the pulse motor 32 rotates with one pulse, so that even if there are differences in the size of the coil spring to be processed, the thickness of the wire material, etc., one device can handle all of them. did. In the above, if the indicated multiple of the pulse multiple indicator 44 is, for example, 1M, when the pulse signal is +2, +20 pulses are sent to the pulse motor 32.
The pulse motor 32 rotates in the positive direction by 20 pulses. The mechanism by which the pitch tool 8 moves in and out through the rotation of the pulse motor 32 is illustrated in FIG. 3, and will be described later. Next, the movable contact 19 moves to the second contact 2.
1, the actual measured value is 132 and the set value of the second reference value input is 135, then the pulse motor 32 rotates in the negative direction by 30 pulses.

Furthermore, if the actual measurement value is 243 and the set value is 2 points at the third measurement point where the movable coin point 19 contacts the third contact point 22, the pulse motor 32 rotates in the positive direction by 50 pulses. .

After that, the final cutting process begins, and the movable contact 19 is brought into contact with the fourth contact 23 just before the cutter is moved at that position to set the fourth measurement point, and the actual measurement value at the fourth measurement point is 249. If the set value is 250, the pulse motor 32 will rotate in the negative direction by 10 pulses, and if the coil spring is completed immediately after this fourth measurement point, the next coil spring will be manufactured. starts when the pulse motor 32 rotates by 10 pulses in the negative direction.

On the other hand, a case where the set value has an appropriate range will be described below. That is, if the moment when the movable contact 19 and the first contact 20 to the fourth contact 23 come into contact is defined as the first to fourth measurement points in the same manner as described above, the actual measured value of the capacitance at the first measurement point is 102, and the setting range of the first setting value input 26 is 9.
If it is 8 to 100, up to this range it is plus 2
There is a difference.

However, in reality, the pitch of the coil spring is corrected by operating the difference of +3 up to 99, which is the intermediate value considered to be the safest value within the setting range, in the same manner as described above. And similarly,
The second measurement point and the third measurement point are each corrected, and the fourth measurement point in the completion cutting process is also corrected in the same manner to complete the process. In FIG. 3, 34 is a worm fixed to the rotating shaft of the pulse motor 32, which is connected to the machine base (not shown).
The tip of the threaded rod 36 engages with a worm gear 35 screwed onto the threaded part of a screw rod 36 which is rotatably and slidably attached to the machine base, and the tip of the screw rod 36 is attached to an L-shaped lever 38 which is swingably attached to the machine base with a support shaft 37. By connecting the end of the L-shaped lever 38 and the pitch tool 8 with the operating punch 39, the pulse motor
32, the pitch tool 8 appears and disappears when rotated in the forward and reverse directions.

The long slot holes 40 and 41 provided in the L-shaped lever 38 are connecting pins 41 that connect the L-shaped lever 38 to the threaded bran 36 inserted through the long slot holes. A screw punch 42 is partially attached so that it cannot swing but can rotate freely.
The position of the connecting pin 41 relative to the L-shaped lever 38 can be moved by rotating the knob 43 fixed to the threaded groove 42, thereby changing the amount of movement of the pitch tool 8 relative to the amount of rotation of the pulse motor 32. It is made so that it can be adjusted.

Moreover, if the apparatus of the present invention is equipped with the following mechanism that makes it easy to determine whether the product is good or bad, even better effects will be achieved.

This mechanism uses a program to predetermine a reference range at the time of product completion, and then compares the measured capacitance at the fourth measuring point with the preset range to measure the capacitance at the time of product completion. This makes it possible to distinguish between non-defective products, long products, and short products. In other words, if the capacitance range when the product is completed is set to, for example, 245 to 255, a value of 249 actually measured at the fourth measurement point in the fall will pass, but a coil spring with an actual value of less than 245 will pass. , when this value is obtained, damper 5 in Figure 8
The longest product that has fallen down the product chute 46 with a tilt of 0 is dropped into the longest product chute, and if the value exceeds 255, the damper 51 is tilted and the shortest product that has fallen down the product chute 46 is dropped into the longest product chute. The product falls into a short product chute 49, and only products within an appropriate range fall into an acceptable product chute 47. Reference numeral 45 in FIG. 4 is an operating mechanism for the product determining device and the dampers 50, 51. Furthermore, a program may be created to stop the machine when it produces rejected products several times in a row.

Note that the present invention is not limited to the number of measurement points, etc., and by increasing the number, it is possible to manufacture coil springs while performing various tricks and corrections.

Since the present invention is configured as described above, when manufacturing a coil spring, the capacitance is sequentially measured during the manufacturing process, and the actual measured value is compared with a preset value to determine if there is a difference. The pitch tool is moved in and out to make the total length of the final product coil spring as close to the set length as possible, which can minimize the production of defective products. It is.

That is, in a coil spring manufacturing machine, a sensor 9 for measuring the capacitance existing between the coil spring 7 and the winding start end is disposed in front of the movement of the coil spring 7 when the coil spring 7 is wound. One or more measurement points are set at the passing position and the completed cutting position during the movement process of the winding start end from the start of winding to the completion of the winding of the spring 7, and the relationship between the winding start end and the sensor 9 at each measurement point is set. A set value of the capacitance that exists between is set in advance, and this set value is compared with the actual measured value of the capacitance at each measurement point by the sensor 9, and whether the actual measured value is different from the set value or When the set value is out of the range, the difference between the measured value and the set value and its plus or minus is detected, and the detected signal is used to control the pitch tool 8 of the coil spring manufacturing machine.
By providing a detection control device that immediately appears and withdraws the pitch of the coil spring 7 to correct the pitch of the coil spring 7, one or more measurement points are provided at appropriate positions in the movement process of the winding end of the coil spring 7. The pitch of the coil spring is corrected each time, and the pitch is further corrected by setting a measurement point at the completed cutting position, making it possible to make very accurate corrections, and the correction is automatically performed by the detection control device. This makes it possible for anyone to manufacture coil springs with excellent dimensional accuracy without the need for experienced workers.

Since such correction control is performed on the pitch tool which is the key to determining the length of the coil spring in the coil spring manufacturing machine, it is possible to manufacture a coil spring with excellent precision. As explained above, according to the present invention, when manufacturing a coil spring whose total length is regulated, it is possible to automatically perform correction processing without requiring an expert, and as a result, it is possible to eliminate defective products. It is possible to significantly reduce the cost because the generation is kept to a minimum and it is suitable for mass production, and it is especially effective when the total length is regulated with long coil springs. It has various excellent effects.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIGS.
The figure is a front view of the main parts when a measuring position detection device is installed in a coil spring manufacturing machine, FIG. 3 is a schematic plan view of the main parts when a pitch tool retracting device is also installed, and FIG. 5 to 7 are schematic plan views showing the manufacturing process of the coil spring, and FIG. 8 is a schematic front cross-sectional view of the product sorting device. 1... Spring line village, 2, 3... Sending. -Rule, 4... Guide, 5... Holder, 6...
- Winding rod, 7...Coil spring, 8...Pitch tool, 9...Sensor, 10...Cutter, 11...
Base rotation axis, 12...cam for cutter operation, 13
...Actuation part, 14...Lever, 15...
・Ukekoro, 16...Link, 17...
Oscillating body, 18...Rotation position detection board, 19...
...Movable contact, 20...First contact, 21...
...Second point, 22...Third contact point, 23.
...Fourth contact, 24...Measurement position detection device,
25... CPU, 26... First set value input, 2
7... Second set value input, 28... Third set value input, 29... Fourth set value input, 30...
・Analog-digital converter, 31...Pulse converter, 32...Pulse motor, 33...
Pitch tool variable device, 34・'. ．．・Warm, 3
5...Worm gear, 36...Threaded rod, 3
7... Support shaft, 38... L-shaped lever, 3
9... Working punch, 40... Long slot, 41
......Connecting pin, 42...Screw punch, 43...Knob, 44...Pulse multiple indicator, 45...Product determiner, 46...Product chute, 47 ... Acceptable product chute, 48 ... Long product chute, 49
...Short product chute, 50, 51...
damper. Leopard 1 figure 2 figure 3 figure 5 figure 6 figure 7 leopard 8 figure

Claims (1)

[Claims] 1 In a coil spring manufacturing machine, a sensor is placed in front of the movement of the winding start end when winding the coil spring to measure the capacitance that exists between the winding start end and itself, and the coil spring is wound. Set one or more measurement points at appropriate positions during the movement process of the starting end of the winding from the beginning to the end of the winding, and at the completed cutting position,
A set value of the capacitance existing between the winding start end and the sensor at each measurement point is set in advance, and this set value is compared with the actual value of capacitance measured at each measurement point by the sensor. If the measured value differs from the set value or is out of the range of the set value, the difference between the measured value and the set value and its plus or minus is detected, and the pitch tool of the coil spring manufacturing machine is immediately activated using this detected signal. A position correction device for a pitch tool in a coil spring manufacturing machine, comprising a detection control device that corrects the pitch of a coil spring by moving it in and out.