JPH0258009B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a marking device for detecting a portion of a traveling material to be marked and applying a marking to that portion, regardless of the traveling speed of the traveling material. The present invention relates to a mark position control device that enables accurate marking.

In order to clarify the position of a running material such as a wire rod by marking the defective position, etc., the part to be marked is detected and marked. A mark position detection device that outputs a signal, a moving distance detection device that detects the moving distance of the traveling material and outputs a distance signal of the number of pulses corresponding to the moving distance, and is arranged at a downstream position of the mark position detection device. A marking device is provided, which includes a marking means for marking the traveling material. As a mark position control device suitable for such an apparatus, a mark signal is transmitted so that a mark is applied to a portion of the traveling material to be marked regardless of the separation distance between the marking means and the mark position detection device. A mark position control device has been proposed that includes a shift register that holds the traveling material until it moves a predetermined distance and then outputs the output, and causes a marking means to perform marking by outputting a mark signal from the shift register. However, this device performs marking in accordance with the travel distance regardless of speed fluctuations of the traveling material, and compared to previous analog mark position control devices, it is capable of marking signals that overlap even if the mark signals are generated close to each other. There is an advantage in that it is possible to receive a later signal of the mark signal and mark the part of the traveling material at the position corresponding to the subsequent signal, but as the traveling speed of the traveling material increases, the accuracy of the mark position decreases. However, there were disadvantages in that the traveling speed of the traveling material was limited.

That is, the shift register is provided with a fixed number of storage locations corresponding to the separation distance between the mark position detection device and the marking means, and outputs the mark signal shifted by the number of storage locations according to the distance signal. Therefore, in such a device, the period from when the mark position is detected until the mark signal is output, and from the time the signal is supplied to the marking means until the mark is actually placed on the traveling material. ,
Also, it takes a certain amount of time from the time when the signal supply to the marking means is stopped until the marking is actually completed, so this is not a problem as long as the traveling speed of the traveling material is low, but when the traveling material As the traveling speed increases, the distance traveled by the traveling material in these times becomes progressively larger until it becomes non-negligible, thereby determining which parts of the traveling material should be marked and which are actually marked. The position will become significantly different.
Therefore, in this type of conventional apparatus, the maximum speed of the traveling material had to be limited so that such deviations were within a practically acceptable range.

The present invention has been made against the background of the above circumstances, and an object thereof is to provide a mark position control device that controls mark position with high accuracy even during high-speed running.

In order to achieve such an object, the present invention provides a mark position detection device that detects a portion of a traveling material to be marked that is made to travel at a predetermined speed and outputs a mark signal, and a mark position detection device that detects the distance traveled by the traveling material. a moving distance detecting device that outputs a distance signal with a number of pulses corresponding to the distance; and a moving distance detecting device disposed downstream of the mark position detecting device in the traveling direction,
A marking device comprising a marking means for marking the traveling material, the mark position control device causing the marking means to mark a portion to be marked based on the mark signal and the distance signal, (1) a reference signal generator that outputs a reference pulse signal of a predetermined constant frequency; (2) a series of storage locations for storing signals associated with the generation of the mark signal and for storing the distance signal; a shift register that causes the marking means to perform marking by sequentially shifting the storage location of the stored signal in synchronization with and outputting the stored signal after a predetermined number of storage locations have passed; (3) The moving speed of the traveling material is detected based on the reference pulse signal and the distance signal, and as the moving speed increases, the number of shifts required until the signal stored in the storage location of the shift register is output. and an adjustment circuit that reduces the

In this way, as the moving speed of the traveling material increases, the number of shifts required until the signal stored in the memory location of the shift register is output is reduced, so that the part to be marked is detected and then marked. The moving distance of the traveling material corresponding to a certain delay time such as the detection time until the signal is output and the marking time from when the signal is supplied to the marking means until the mark is actually placed on the traveling material is the distance traveled by the traveling material. Even if it is expanded by increasing movement speed,
Corresponding to the increased travel distance, the signal from the shift register is output faster, allowing marking to be performed with high precision. Therefore, marking work can be performed at high speed, and the throughput of the marking device is greatly improved. According to experiments conducted by the present inventors, marking with sufficient accuracy can be obtained even at traveling speeds of 500 m/min or more, whereas conventionally 300 m/min was the practical limit, and the processing capacity is at least 66%. This can be improved even more.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below based on the drawings.

In FIG. 1, a traveling material 10 such as a wire or tube material that has been drawn out from a container (not shown) such as a feeding cage is first passed through a straightener 12 to straighten its bends and then run in a straight line. At a downstream position of the straightener 12, there is a fixed length roll 14 whose outer peripheral surface contacts the running material 10 and is rotated as the running material 10 moves, and a fixed length roll 14 which is connected to the shaft of this fixed length roll 14 and rotates the fixed length roll 14. A moving distance detecting device 18 consisting of a rotary encoder 16 that outputs a distance signal SD with a number of pulses corresponding to the corner is provided, so that the moving distance of the traveling material 10 can be detected.

At a downstream position of the moving distance detection device 18, there is a flaw detection device 20 through which the traveling material 10 passes, and this flaw detection device 2.
A spray device 22 is disposed further away from 0 by a certain distance L. The flaw detection device 20 detects flaws in the traveling material 10 and at the same time sends a mark signal SM.
This is a normal device that outputs a mark, and forms a mark position detection device that detects the flaw position on the traveling material 10, which is the part to be marked. Further, the spray device 22 forms a marking means that sprays paint onto the traveling material 10 at the same time as the mark activation signal SA is supplied.

In order to accurately mark the flaw position on the traveling material 10, the mark signal SM is detected after a predetermined period of time from the generation of the mark signal SM based on the distance signal SD.
A mark position control device 24 is provided which outputs a mark activation signal SA to the SM.

As shown in FIG. 2, the mark position control device 24 includes a shift register 26 and a reference signal generator 2.
8, an adjustment circuit 30, a mark width adjustment circuit 32, etc.

The reference signal generator 28 outputs a reference pulse signal SP having a predetermined time width and period as shown in FIG. 3 to an AND circuit 34, a counter 36,
and is supplied to the latch circuit 38. AND circuit 3
4 is supplied with the distance signal SD, and the AND circuit 34 supplies the distance signal SD to the counter 36 only while the reference pulse signal SP is rising. The counter 36 has its contents cleared every time the reference pulse signal SP rises, counts the output signal of the AND circuit 34, and supplies a speed signal SV representing the counted contents to the latch circuit 38. Here, since the count of the counter 36 corresponds to the distance of the traveling material 10 within a certain pulse width of the reference pulse signal SP, the speed signal SV represents the moving speed of the traveling material 10. At the same time as the reference pulse signal SP falls, the latch circuit 38 temporarily stores the speed signal SV until the next fall, and supplies the stored contents to the decoder 40 and the mark width speed correction circuit 42. Decoder 4
0, has a plurality of output terminals connected to the parallel input terminals of the shift register 26, and outputs a signal to one of the output terminals, and the position of the terminal where the signal is output increases as the speed signal SV increases. It is adapted to be shifted in the shift direction of the shift register 26.

The shift register 26 includes a plurality of series of memory locations, parallel input terminals corresponding to the memory locations and connected to the output terminal of the decoder 40, and a parallel output terminal, and a parallel output terminal connected to the load terminal L thereof. The signal supplied to the parallel input terminal according to the mark signal SM is stored in a storage location corresponding to the input terminal, and the signal is stored in synchronization with the distance signal SD supplied to the shift terminal T. is sequentially shifted, and furthermore, the stored signal is output from the parallel output terminal corresponding to the storage location.

Therefore, the AND circuit 34 and the counter 3
6. The latch circuit 38 and the decoder 40 shift the storage location of the signal stored in the shift register 26 in relation to the generation of the mark signal SM in the shift direction as the speed of the traveling material 10 increases, so that the signal remains constant. A regulating circuit 30 is formed to reduce the number of shifts from the storage location to the output.

The parallel output terminals of the shift register 26 are connected to an output selection circuit 44 configured by an alternatively selected switch, etc., and the parallel output terminals of the shift register 26 are is alternatively selected, and the signal reaching the memory location corresponding to the selected output terminal is supplied to the load terminal L of the subtraction counter 46. In addition,
This output selection circuit 44 determines the number of memory locations used in the shift register 26 by the flaw detection device 20 and the spray device 2.
2, and the selection operation is performed in advance in accordance with the separation distance.

On the other hand, the mark width speed correction circuit 42 includes a decoder and receives a mark width setting signal SS from a mark width setter 43 configured by a digital switch or the like.
is corrected based on the speed signal SV supplied thereto so that it becomes smaller as the traveling speed increases, and a corrected mark width signal SE representing the result is supplied to the subtraction counter 46. In addition, the zero detection circuit 4 described later
AND circuit 5 which is opened when the content of the input signal to 8 is not zero and its output is at "H" level.
0, the distance signal SD is applied to the clock input terminal CK of the subtraction counter 46.

The subtraction counter 46 loads the corrected mark width signal SE by the signal from the output selection circuit 44, and also loads the corrected mark width signal SE in synchronization with the distance signal SD supplied to its clock input terminal CK.
The numerical value represented by SE is subtracted, and a signal representing the result of the subtraction is sequentially supplied to the zero detection circuit 48. The zero detection circuit 48 determines whether the content of the signal supplied thereto is zero or not, and if it is not zero, it supplies the mark activation signal SA of "H" level to the AND circuit 50, and also outputs the AND circuit 52. is supplied to the spray device 22 via the spray device 22.

That is, mark width speed correction circuit 42, mark width setter 43, subtraction counter 46, zero detection circuit 4
8. The AND circuit 50 supplies the mark actuation signal SA to the spray device 22 simultaneously with the signal output from the shift register 26, and causes the traveling material 10 to move a distance corresponding to the value supplied from the mark width speed correction circuit 42. By holding the output of the mark actuation signal SA until the mark operation signal SA is turned on, a mark width adjustment circuit 32 is formed that applies a marking of a constant width to the traveling material 10 regardless of speed fluctuations of the traveling material.

A stop detection circuit 54 is provided which outputs an "L" level stop signal ST to the AND circuit 52 when the pulse signal that is the content of the distance signal SD does not exist within a certain period of time. If the spray device 22 is stopped due to this, a mark activation signal SA is sent to the spray device 22 to prevent paint from being sprayed continuously.

The operation of this embodiment will be explained below.

For example, when a flaw in the traveling material 10 is detected by the flaw detector 20 at point A in FIG.
is supplied as a load signal to the flaw detector 20.
During a certain detection time until the mark signal SM is output, such as the response time of , the activation time of its output relay, etc., the part to be marked with a flaw moves to point B.

A mark signal SM is supplied to a shift register 26 to select one of the running material 10 of its series of storage locations.
A signal "1" related to the generation of the mark signal SM is stored in a memory location determined by the decoder 40 corresponding to the speed of In synchronization, the signal "1" is sequentially shifted. By shifting n times, the signal “1” is output to the output selection circuit 44.
When the memory location determined by
A corrected mark width signal SE, for example "7", from the mark width speed correction circuit 42 is loaded into the signal 6.
Therefore, the mark activation signal SA of "H" level is immediately output from the zero detection circuit 48, and
The movement signal SD is supplied to the subtraction counter 46 via the AND circuit 50, and subtraction of the loaded value is started. At the same time, the mark activation signal SA is supplied to the spray device 22 via the AND circuit 52,
Paint begins to be sprayed from the spray device 22 toward the traveling material 10 . Point C in FIG. 4 indicates the flaw position in this state. However, after the mark activation signal SA is supplied to the spray device 22, the paint is applied to the traveling material 1.
0, the spray device 22
A certain marking time is required, such as the operating time of the machine itself and the flight time of the paint, and the flaw position further moves to point D within that time.

That is, when the traveling material 10 is driven at high speed as shown between points A and B and between points C and D in FIG. 4, the above-mentioned detection time, marking time, etc. Since the traveling distance of the traveling material 10 within a certain delay time is large, the number of shifts n corresponding to the moving distance obtained by subtracting the traveling distance from the distance L between the flaw detection device 20 and the spray device 22 is determined. .

Then, at the same time as the flaw position reaches point D, paint is applied to the flaw position and a marking is applied. Thereafter, when the content of the subtraction counter 46 reaches zero as the traveling material 10 travels, the output of the mark activation signal SA from the zero detection circuit 48 is stopped, the operation of the spray device 22 is stopped, and the subtraction counter 46 is stopped. The supply of the distance signal SD to the counter 46 is blocked by the AND circuit 50, so that the content of the subtraction counter 46 is maintained at zero.
As a result, when the flaw position reaches point E in Figure 4,
The spraying of the spray device 22 is stopped, and at the same time as the point F is reached, the deposition of the in-flight paint sprayed from the spray device 22 is completed.
Therefore, the numerical value loaded from the mark width speed correction circuit 42 to the subtraction counter 46 is the numerical value that determines the width (length) of the marking after being corrected by the traveling speed, and the subtraction counter 46 is a numerical value that determines the width (length) of the marking after being corrected by the traveling speed.
Since the output period of the mark activation signal SA is adjusted based on SD, a marking with a constant width (length) determined by the numerical value is applied regardless of changes in the traveling speed of the traveling material 10. Even if the above operation occurs even if the mark signals SM overlap in close proximity,
This is done for each mark signal SM.

Next, if the traveling speed of the traveling material 10 is changed, for example, in an increasing direction, the detection time is increased as shown between points A and B and between points C and D in FIG. The traveling distance of the traveling material 10 within a certain delay time such as the marking time or marking time increases as the traveling speed increases. Therefore, in a conventional control device in which the number of shifts from when a signal is stored in the shift register 26 until it is output is constant, the change in the travel distance of the traveling material 10 corresponding to the above-mentioned constant delay time is This results in a positional shift between the part to be marked and the part actually marked.

On the other hand, according to this embodiment, the traveling material 10
Decoder 4 according to the speed signal SV representing the speed of
Since the output signal output from 0 is output from the output terminal shifted in the shift direction of the shift register 26 among the plurality of output terminals, the mark signal
The storage location of the shift register 26 that stores the output signal of the decoder 40 by the SM is shifted in the shift direction depending on the speed of the traveling material 10, for example, two locations are shifted compared to the case of FIG. 4 described above. considered a place. As a result, the signal stored in the shift register 26 is shifted (n-2) times and output, and the same marking as described above is applied. That is, the number of times the signal is shifted in the shift register 26 is reduced by two times compared to the case described above.
Since the signal is outputted from the shift register 26 at an early stage corresponding to the number of two shifts, the marking of the traveling material 10 is applied regardless of the increase in the travel distance of the traveling material 10 corresponding to the certain delay time. Marking begins to be done accurately at the desired flaw location. Since the flight time of the paint at the end of the operation of the spray device 22 is longer than that at the start of marking, the value loaded from the mark width speed correction circuit 42 to the subtraction counter 46 is reduced to, for example, "5". Therefore, when the flaw reaches point E in FIG. At this point, the paint application is complete and a certain length of marking is applied.

Although the embodiment of the present invention has been described above based on the drawings, the present invention can also be applied to other aspects.

For example, the flaw detection device 20 may be of various types, such as an electromagnetic type or a reflective photoelectric type, and the marking means may be not only the spray device 22 but also a device that marks the traveling material 10 by direct contact. be.

The regulating circuit 30 in the embodiment described above is a speed signal.
The memory location input to the shift register 26 is shifted in the shift direction as the SV increases. The storage location of the signal output to the subtraction counter 46 may be shifted in the counter-shift direction and selected as the speed signal SV increases.

Further, in the above-mentioned embodiment, marking is applied from the flaw position on the traveling material 10, but the number of shifts of the shift register 26 is determined in advance so that the flaw position is located at the center of the marking width. It's okay to stay.

Furthermore, the mark position control device 24 in FIG.
Needless to say, the microcomputer can be replaced by a so-called microcomputer equipped with a program equivalent to its functions.

As detailed above, according to the mark position control device of the present invention, as the moving speed of the traveling material increases, the number of shifts until the signal stored in the storage location of the shift register is output is reduced. ,
Regardless of the increase in the moving distance of the traveling material corresponding to a certain delay time such as the detection time or the marking time, markings are accurately placed at the locations to be marked. Therefore, the traveling speed of the traveling material can be increased, and the throughput of the marking device can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a marking device including an embodiment of the present invention. FIG. 2 is a block diagram showing the embodiment of FIG. 1. FIG. 3 is a time chart explaining the operation of FIG. 2. 4 and 5 are diagrams each explaining the operation of the embodiment of FIG. 1. FIG. 10: Traveling material, 18: Traveling distance detection device, 2
0: flaw detection device (mark position detection device), 22: spray device (marking means), 24: mark position control device, 26: shift register, 28: reference signal generator, 30: adjustment circuit.

Claims (1)

[Claims] 1. A mark position detection device that detects a portion of a traveling material to be marked and outputs a mark signal, which is made to travel at a predetermined speed; a moving distance detecting device that outputs a distance signal with a corresponding number of pulses; and a moving distance detecting device disposed downstream of the mark position detecting device in the traveling direction,
A marking device comprising a marking means for marking the traveling material, the mark position control device causing the marking means to mark a portion to be marked based on the mark signal and the distance signal, a reference signal generator for outputting a reference pulse signal of a predetermined constant frequency; and a series of storage locations for storing signals associated with the generation of the mark signal and for storing the signals in synchronization with the distance signal. a shift register that causes the marking means to perform marking by sequentially shifting the storage locations of the stored signals and outputting the stored signals after passing through a predetermined number of storage locations; and the reference pulse signal and the distance. an adjustment circuit that detects the moving speed of the traveling material based on the signal, and decreases the number of shifts until the signal stored in the storage location of the shift register is output as the moving speed increases. A mark position control device for a marking device, characterized in that: