WO1986000347A1 - Method and apparatus for detecting knit/woven fibers - Google Patents

Abstract

The brightness of knit/woven fibers in a direction crossing at right angles the moving direction of the moving knit/woven fibers is converted to electric pulse signals by radiating light from a light source through an optical magnifier and a photodetector, and the pulse signals are counted. Texture pitches are memorized, and are multiplied by the number of signals of a counter using an operation circuit in order to calculate the moving distance of the fibers. This invention relates also to a method and apparatus for detecting knit/woven fibers which can detect not only the moving distance but also the existence of the knit/woven fiber.

Description

 Specification

 [Title of Invention]

 Knitting · Fabric detection method and device

 〔Technical field〕

 The present invention relates to a detection method and a device for detecting the amount of movement of a knit or woven fabric, the presence or absence thereof, and the like.

 (Background technology)

 As a conventional technique of this kind, for example, a technique for detecting the amount of movement of the fabric, as described in Japanese Patent Publication No. 53-6891, a measuring wheel is elastically brought into contact with a moving cloth. Then, the measuring wheel is rotated with the movement of the cloth, for example, when the cloth moves one step and the measuring wheel rotates, one pulse is generated, the pulse is generated, and the number of pulses is counted. One that detects the amount of cloth movement is known.

 However, this conventional movement amount detecting means is configured such that the measuring wheel rotates in contact with the cloth, so that a slight slip occurs between the cloth and the measuring wheel, or the measurement based on a change in the moving speed of the cloth. Due to the influence of the rotational inertia of the wheel, etc., an error occurs between the actual movement amount of the cloth and the measurement movement amount by the measuring wheel, and there is a disadvantage that the accurate movement amount cannot be measured.

In addition, in the method of measuring the amount of movement by the measuring wheel, since the measuring wheel rotates in conjunction with the movement of the cloth fed by the cloth feeding mechanism of the machine, the cloth feeding direction by the sewing machine is reversed. When the cloth moves in the opposite direction, the measuring wheel does not rotate, and therefore the amount of movement can be measured only when the cloth moves in one direction. There are drawbacks that cannot be made.

 In addition, when the sewing machine is stopped and the cloth is turned around the needle when the sewing machine is stopped during sewing, because the measuring wheel is in contact with the cloth in front of the needle, the cloth is moved to the side. There was a drawback that these could not be sewn because the work was not possible.

 [Disclosure of the Invention]

 SUMMARY OF THE INVENTION It is an object of the present invention to accurately detect the movement amount or presence or absence of a knit or woven fabric without contacting the knit or woven fabric with a means for detecting the movement amount or the presence or absence of a knit or woven fabric.

 [Brief description of drawings]

 FIG. 1 is a schematic front view of the apparatus, FIG. 2 is a block diagram showing the first embodiment, FIG. 3 is an image of a cloth formed on an image forming surface, and FIG. 4 is a second embodiment. FIG. 5 is a time chart for measuring the distance of one pitch of a stitch of a cloth, and FIG. 6 is a block diagram showing a third embodiment.

 [Best mode for carrying out the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

 (Example1)

 Reference numeral 1 denotes a sewing machine frame. The needle bar 4 having a needle 3 having a needle 3 at a lower end thereof is moved up and down in conjunction with rotation of a metal 2 and a main shaft (not shown) which always receives a downward pressing force E. And a feed dog 6 for moving the cloth 5 to the left in FIG.

Reference numeral 7 denotes a light shield for eliminating the influence of extraneous light. (Right side in Fig. 1) and place it above the cloth, and form an imaging surface 8 on the upper surface.

Reference numeral 9 denotes an optical magnifier, which is disposed below the light shield and expands the reflected light of the light emitted from the light source 10 placed on the cloth to the cloth 5 as shown in FIG. An image is formed on the image plane 8.

 An optical guide 11 has one end connected to the upper end of the image plane 8 and the other end connected to a light receiving element 12 as a detecting means.

 FIG. 2 is a block diagram for processing a signal from the light receiving element 12, 13 is an amplification circuit, and 14 is a peak detector for judging the level of light. Reference numeral 15 denotes an AND circuit, which is connected to a peak detector 14 on one side of the input side and outputs an output signal only when the output signal of the light receiving element 12 is required on the other side of the input side. Connect the sequence circuit 16 that generates When an output signal is input from the peak detector 14 and the sequence circuit 16, the AND circuit 15 opens the AND circuit and outputs the output from the peak detector 14. Let it pass. Is an example of a processing circuit. Reference numeral 17 denotes a power counter, which counts an output signal from the AND circuit 15.

 Reference numeral 18 denotes a storage circuit, which stores the characteristics of the cloth, for example, the distance between adjacent yarns, that is, the weave pitch, calculated from the number of yarns to be driven or the number of braids per unit length of fiber.

 Reference numeral 19 denotes an arithmetic circuit, which multiplies the number of signals from the counter '-17 by the characteristic of the cloth 5 from the storage circuit 18, that is, the distance between adjacent wefts X, and moves the cloth 5 Is calculated.

The first embodiment has the above configuration, and the operation will be described next. First, the characteristics of the cloth 5 used, for example, the length of the weave pitch of the cloth 5 used are stored in the storage circuit 18.

 From this state, the sewing machine is driven after the cloth 5 to be used is arranged below the presser foot 2 of the sewing machine as shown in FIG.

 Thereby, the cloth 5 moves to the left in FIG. 1 by the cooperation of the four movements of the feed dog 6 and the presser foot 2, the needle 3 moves up and down, and the cloth 5 is sewn.

 As the cloth 5 is moved by the sewing machine, the texture of the cloth 5 is enlarged as shown in FIG. Then, when the image formed on the image plane 8 moves, light and dark signals of light are input to the input side of the light receiving element 12 via the light guide 11 at every eye pitch, and the light receiving element 12 From the output side, high-level and low-level power signals corresponding to light brightness and darkness are output alternately. After this voltage signal is amplified by the amplifier circuit 13, the peak detector 14 determines the high or low level of the voltage, and outputs only one level, for example, only the high level signal. Output as signal and input to one input terminal of AND circuit 15. Further, when a signal is required from the sequence circuit 15, for example, when the sewing machine starts driving, a drive signal is generated and input to the other terminal of the AND circuit 15. When two signals, an input signal from the peak detector 14 and an input signal from the sequence circuit 15, are input to the AND circuit 15, the AND circuit 15 outputs the signal. Generates an output signal for each weave pitch of the cloth 5.

The output signal from the AND circuit 15 is counted by the counter 17 and the counted value is input to the arithmetic circuit. And act β

The arithmetic circuit 19 multiplies the count value from the counter 17 by the length of the first pitch stored in the memory circuit 18 to calculate the moving distance of the cloth 5, and then calculates the moving distance electrically. Controls cloth feeding based on information.

 (Example 2)

 FIG. 4 shows a second embodiment. Reference numeral 20 denotes an image sensor (solid-state imaging device) which receives a signal from the light guide 11 shown in FIG. Reference numeral 21 denotes an amplification circuit, and reference numeral 14 denotes a peak detector. As shown in FIG. 5, of the high and low level outputs output from the amplification circuit 21 at every pitch of the weave, Generates a pulse corresponding to one of the high output peak and the low output peak.

 15 and 25 are end circuits, 26 is an OR circuit, 17 is a counter, 19 is an arithmetic circuit, and 1S is a sequence circuit similar to that in Fig. 1. An output signal is generated only when the output signal from the detector 14 is required. Reference numeral 23 denotes a pulse generation circuit for generating a pulse for driving the image sensor 20. The pulse and the output of the image element of the image sensor 20 have a one-to-one correspondence. Reference numeral 27 denotes a storage circuit, which stores a value of one pitch (distance) of a pixel element unique to the image sensor, for example, one pitch 14 «πι.

This embodiment has the above configuration. In this embodiment, in order to detect the amount of movement of the cloth 5, the cloth pitch of the cloth is measured before the detection and the numerical value is recorded. 'That is, the cloth whose movement amount is to be detected is e

 After placing it down, a signal is sent from sequence circuit 16 to the input of AND circuit 25, and the gate of AND circuit 25 is opened.

 From this state, as shown in Fig. 5, the output of the peak detector 14 passes through the optical magnifier 9, the image sensor 20 and the amplification circuit 21. The pulse of the pulse generator 23, which is proportional to, passes through the AND circuit 25 and the OR circuit 26, and the number of the pulses is counted by the counter 17. Since the output of the image sensor 20 and the pulse of the pulse generator 23 correspond one-to-one as described above, the number of pulses counted by the counter 17 and the above-mentioned image The arithmetic circuit 19 calculates the distance of one pitch (for example, 14 tfm) of the image element of the sensor-, calculates the distance of one pitch of the cloth texture, and stores the numerical value. : Remember the circuit.

Next, in order to detect the movement amount of the cloth, first, an i signal is sent from the sequence circuit 16 to the input of the AND circuit 15, the gate of the AND circuit 15 is opened, and the AND circuit is opened. Close circuit 25. When the cloth moves below the optical magnifier 9 from this state, light and dark signals of light are alternately input to the image sensor 20 at every stitch pitch of the cloth, and this signal is transmitted through the amplification circuit 21. As shown in FIG. 5, the peak detector 14 generates an output signal by detecting only a signal, for example, as shown in FIG. It is counted by the counter 17 through the circuit 15 and the calculated value and the distance between the nip of the cloth weave measured in advance and stored in the storage circuit 27 are calculated by a calculation circuit. Thus, the amount of movement of the cloth can be detected. T

 (Example 3)

 FIG. 6 shows a third embodiment. Reference numeral 28 denotes a light receiving element such as a phototransistor, a photo diode, or a image sensor for receiving a signal from the optical guide 11 shown in FIG. 21 is an amplifier, 14 is a peak detector, 15 is an AND circuit, 16 is a sequence circuit, and 29 is a pulse detector.

 In this embodiment, when the cloth 5 moves in the same manner as in the first embodiment, the brightness of the light is input to the light receiving element 28 at every pitch of the weave, and a high level f is output from the light receiving element 28. A low level electrical signal is output. This signal is amplified by the amplifier 21 and the peak detector 14 generates a pulse corresponding to only one of the high level signal and the low level signal in the same manner as in FIG. And output it to AND circuit 15. For example, if an output signal is output from the sequence circuit 16- at the same time that the cloth 5 starts moving, for example, the AND circuit is opened by the output signal from the sequence circuit 16 and the output of the peak detector 22 is turned on. Through the AND circuit 15, signals of 5 ″,..., £ detected by the peak detector are output alternately.

 The output signal from the AND circuit 15 is output at time intervals corresponding to the moving speed of the cloth 5 while the cloth 5 is moving under the optical magnifier 9 shown in FIG. You.

 When the end of the cloth 5 has passed below the optical magnifiers 9..., The output signal with an arbitrary time interval from the AND circuit 15 disappears.

The output signal with a fixed time interval from the above AND circuit 15 Five

The presence or absence of a signal is detected by the pulse detector 29, whereby the end of the moving cloth 5 can be detected, and a stop signal of the mechanism can be obtained.

 In the above embodiment, the case of detecting the movement amount and presence / absence of the woven cloth has been described.However, even when the knitted fabric is moved below the optical magnifier, bright and dark signals are generated alternately. The movement amount and the presence or absence of the knitted fabric can also be detected.

 [Industrial applicability]

 As described above, the present invention has a configuration in which the lightness and darkness of a knitting / woven fabric in a direction intersecting with the moving direction of a moving knitting / woven fabric are detected, and the movement amount and presence / absence of the knitting / woven fabric are detected. Since moving knitting can be detected in a non-contact state with the fabric, the knitting is always accurate without being affected by changes in the moving speed or moving direction of the knitting. Is effective in detecting

 Also, since the detecting means can detect the knitting and woven fabric in a non-contact state, it is necessary to stop the sewing machine in the middle of sewing and turn the knitting and woven fabric around the needle. Since it can rotate smoothly without being hindered, it also has the effect of excellent workability.

Claims

 $  The scope of the claims  1) Moving knitting • Knitting in the direction that intersects the moving direction of the woven fabric • Knitting that detects the amount of movement of the woven fabric by detecting the brightness of the woven fiber, and the woven fabric.  2) a light source for illuminating the cloth surface,  A light magnifier that magnifies the light from the cloth surface to form an image, and a knitting optical detector that detects the brightness of the image plane as the fabric moves and generates a signal.  A knitting and woven fabric detection device equipped with an output device that processes signals from the detector and outputs information on the amount of movement of the woven fabric and the absence of the woven fabric.