CN110835809A - Stitch length detection method, stitch length detection device, computer device, and readable storage medium - Google Patents
Stitch length detection method, stitch length detection device, computer device, and readable storage medium Download PDFInfo
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- CN110835809A CN110835809A CN201911189897.6A CN201911189897A CN110835809A CN 110835809 A CN110835809 A CN 110835809A CN 201911189897 A CN201911189897 A CN 201911189897A CN 110835809 A CN110835809 A CN 110835809A
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B27/00—Work-feeding means
- D05B27/22—Work-feeding means with means for setting length of stitch
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B55/00—Needle holders; Needle bars
- D05B55/10—Needle bars for multiple-needle sewing machines
- D05B55/12—Needle bars for multiple-needle sewing machines with provision for varying the distance between the needles
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/20—Control devices responsive to the number of stitches made
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- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention provides a needle pitch detection method, which comprises the following steps: determining the movement direction of the cloth feeding assembly according to the relative position relation of the waveforms between the first signal and the second signal; calculating the movement distance of the cloth feeding assembly in one movement direction according to the number of the waveform periods of the first signal and the second signal; and determining the current needle pitch according to the movement distance of the cloth feeding assembly in one movement direction. According to the needle pitch detection method provided by the invention, the grating and the photoelectric sensor are matched to detect the needle pitch value, the grating or the photoelectric sensor is arranged on the cloth feeding assembly and moves along with the cloth feeding assembly, and the current needle pitch is obtained according to two grating signals with the same waveform period and different phase differences.
Description
Technical Field
The invention relates to the technical field of sewing machines, in particular to a needle pitch detection method, a needle pitch detection device, computer equipment and a readable storage medium.
Background
In the clothing processing process, the actual needle pitch value of the sewing machine during operation needs to be obtained for the purposes of controlling the length of the wire braid, automatically adjusting the needle pitch and the like. However, the current sewing machine has no device for detecting the needle pitch in real time, so that a user cannot obtain the current needle pitch information, and when the needle pitch needs to be adjusted, the user can only rely on experience or multiple tests, and the aim of quickly adjusting the needle pitch value cannot be achieved.
Disclosure of Invention
In view of the above, it is desirable to provide a method for detecting a needle pitch, a device for detecting a needle pitch, a computer device and a readable storage medium.
The invention provides a stitch length detection method, which is applied to a sewing machine and is characterized in that the sewing machine comprises a cloth feeding component, a grating and a photoelectric sensor, wherein one of the grating and the photoelectric sensor is arranged on the cloth feeding component and can move along with the cloth feeding component, and the other is arranged on a shell of the sewing machine; the photoelectric sensor is used for sensing the motion position of the grating and outputting a first signal and a second signal which have the same waveform period and different phase differences; the needle pitch detection method comprises the following steps:
determining the movement direction of the cloth feeding assembly according to the relative position relation of the waveforms between the first signal and the second signal;
calculating the movement distance of the cloth feeding assembly in one movement direction according to the number of waveform periods of the first signal and the second signal;
and determining the current needle pitch according to the movement distance of the cloth feeding assembly in one movement direction.
According to the needle pitch detection method provided by the invention, the grating and the photoelectric sensor are matched to detect the needle pitch value, the grating or the photoelectric sensor is arranged on the cloth feeding assembly and moves along with the cloth feeding assembly, and the current needle pitch is obtained according to two grating signals with the same waveform period and different phase differences.
In one embodiment of the present invention, the photosensor is configured to sense a movement position of the grating and output a first signal and a second signal having the same waveform period and different phase differences, and includes:
the photoelectric sensor is used for sensing the motion position of the grating and outputting a first signal and a second signal which have the same waveform period and 90-degree phase difference.
So set up, when the work feed subassembly turned to the second direction by the first direction, photoelectric sensor can judge the turn to opportunity and the distance of calculating work feed subassembly in the first direction motion of work feed subassembly more fast accurately, further improved the reliability that the gauge needle detected.
In one embodiment of the present invention, the photosensor is configured to sense a movement position of the grating and output a first signal and a second signal having the same waveform period and different phase differences, and includes:
the photoelectric sensor is used for sensing the movement position of the grating and outputting a first signal and a second signal, wherein the first signal and the second signal are rectangular wave signals with 90-degree phase difference and the same waveform period.
So set up, use the square wave as the wave form of first signal and second signal, the square wave only has two values of high level and low level, and photoelectric sensor is simpler when detecting, also can be more accurate.
In one embodiment of the present invention, the feed assembly is a feed shaft, and the needle pitch detection method further includes, before the step of determining the moving direction of the feed assembly based on the relative positional relationship of the waveforms between the first signal and the second signal:
fixedly arranging the grating on a cloth feeding shaft; alternatively, the first and second electrodes may be,
the cloth feeding component is a cloth feeding tooth frame, and the needle pitch detection method comprises the following steps before the step of determining the movement direction of the cloth feeding component according to the relative position relation of the waveform between the first signal and the second signal:
fixedly arranging the grating on the cloth feeding tooth frame; alternatively, the first and second electrodes may be,
the cloth feeding assembly is a cloth feeding crank, and the needle pitch detection method comprises the following steps before the step of determining the movement direction of the cloth feeding assembly according to the relative position relation of the waveforms between the first signal and the second signal:
the grating is fixedly arranged on the cloth feeding crank.
According to the arrangement, the grating is fixedly arranged on the cloth feeding shaft, the cloth feeding tooth frame or the cloth feeding crank, the three cloth feeding components and the distance between the three cloth feeding teeth for conveying the cloth to be processed have an accurate mechanical transmission relation, and the measured needle pitch has high precision and small error.
In one embodiment of the present invention, in order to locate the photoelectric sensor at a fixed position to measure an accurate needle pitch value, the sewing machine further comprises a housing, and the needle pitch detection method further comprises, before the step of determining the moving direction of the cloth feeding assembly according to the relative positional relationship of the waveforms between the first signal and the second signal:
and fixedly arranging the photoelectric sensor on the shell.
So set up, photoelectric sensor rigidity, the position variation that can accurate detection grating, the real-time gauge needle error that records is little, and the degree of accuracy is high.
In one embodiment of the present invention, one of the optical grating and the photoelectric sensor is disposed on the cloth feeding assembly and can move along with the cloth feeding assembly, and the other is disposed on a housing of the sewing machine, including:
one of the grating and the photoelectric sensor is detachably arranged on the cloth feeding assembly and can move along with the cloth feeding assembly, and the other one of the grating and the photoelectric sensor is arranged on a shell of the sewing machine.
So set up, grating and photoelectric sensor are detachable construction, are convenient for maintain and change.
In one embodiment of the present invention, the step of arranging the grating on the cloth feeding assembly and being capable of following the movement of the cloth feeding assembly further comprises:
the grating is arranged on the cloth feeding assembly and can move along with the cloth feeding assembly, and the number of the gratings is 100, 180, 360 or 720.
By the arrangement, the number of the grids of the grating can be selected according to different precision requirements, and the requirements of different users are met.
The invention also provides a needle pitch detection device, comprising:
the direction detection module is used for determining the movement direction of the cloth feeding assembly according to the relative position relation of the waveforms between the first signal and the second signal;
the distance detection module is used for calculating the movement distance of the cloth feeding assembly in one movement direction according to the number of waveform periods of the first signal and the second signal;
and the needle pitch calculation module is used for determining the current needle pitch according to the movement distance of the cloth feeding assembly in one movement direction.
The invention also provides a sewing machine, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of the method when executing the computer program.
The invention also provides a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method.
Drawings
FIG. 1 is a flow chart of a method of stitch length detection in one embodiment of the present invention;
FIG. 2 is a schematic view showing a structure of a sewing machine according to an embodiment of the present invention;
FIG. 3 is a schematic view of a cloth feeding assembly of the sewing machine shown in FIG. 2;
FIG. 4 is a schematic structural view of a portion of the sewing machine shown in FIG. 2;
FIG. 5 is an exploded view of a portion of the structure shown in FIG. 4;
FIG. 6 is a diagram illustrating a first signal and a second signal according to one embodiment of the present invention;
FIG. 7 is a schematic diagram of the movement of the feed beam;
fig. 8 is a block diagram of a needle pitch detecting apparatus according to the present invention.
100. A sewing machine; 10. a housing; 20. a main shaft; 30. a cloth feeding assembly; 40. a grating; 50. a photosensor; 31. an eccentric wheel; 32. a cloth feeding connecting rod; 321. positioning pins; 33. a cloth feeding shaft; 34. a differential feed crank; 35. a crank sliding sleeve; 36. a tooth lifting slide block; 37. an eccentric shaft; 38. a first slider; 39. a second slider; 301. feed dog frame.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 and 3, fig. 1 is a flowchart illustrating a needle pitch detection method according to an embodiment of the invention; FIG. 2 is a schematic view of a sewing machine 100 according to an embodiment of the present invention; fig. 3 is a schematic view showing a structure of the cloth feeding assembly 30 in the sewing machine 100 shown in fig. 2.
The invention provides a sewing machine 100 which is used for sewing fabrics such as cotton, hemp, silk, wool, artificial fiber and the like and products such as leather, plastics, paper and the like, and the sewn stitches are neat, beautiful, flat and firm, the sewing speed is high, and the use is simple and convenient. The sewing machine 100 of the present invention is an overlock machine. It is understood that in other embodiments, the sewing machine 100 may be a flat-bed sewing machine, a double-needle sewing machine, a buttonhole sewing machine, or other uses of the sewing machine 100.
The sewing machine 100 provided by the invention comprises a shell 10, a main shaft 20, a cloth feeding component 30, a presser foot mechanism (not shown) and a machine head (not shown), wherein the main shaft 20 is arranged inside the shell 10 and is connected with the cloth feeding component 30 and the machine head, the cloth feeding component 30, the presser foot mechanism and the machine head are all arranged on the shell 10, and the presser foot mechanism is opposite to the cloth feeding component 30 and is arranged close to the machine head.
The shell 10 is used for bearing a main shaft 20, a presser foot mechanism, a cloth feeding assembly 30 and a machine head, wherein the main shaft 20 is connected to a power source (not shown) and can drive the presser foot mechanism, the cloth feeding assembly 30 and the machine head to operate under the driving of the power source, the presser foot mechanism is used for pressing cloth conveyed by the cloth feeding assembly 30 so as to improve the quality of sewing, the cloth feeding assembly 30 is used for conveying the cloth to be processed, and the machine head is used for sewing the cloth conveyed by the cloth feeding assembly 30. The main shaft 20 drives the cloth feeding assembly 30 to convey cloth in a reciprocating mode, and then the press foot mechanism appropriately tensions the cloth, so that the machine head can sew the cloth in a good tensioning state, and the sewing and overlocking process of the overedger is completed.
Of course, in addition to the above-mentioned housing 10, the main shaft 20, the presser foot mechanism, the cloth feeding assembly 30 and the machine head, the sewing machine 100 may further include auxiliary mechanisms such as a thread passing mechanism (not shown) and a lubricating mechanism (not shown) to smoothly complete the sewing process, which is not described herein again.
The cloth feeding assembly 30 comprises an eccentric wheel 31, a cloth feeding connecting rod 32, a cloth feeding shaft 33, a differential cloth feeding crank 34, a crank sliding sleeve 35, a feed lifting slide block 36, an eccentric shaft 37, a first slide block 38, a second slide block 39 and a cloth feeding tooth rack 301. Wherein, the eccentric wheel 31 is sleeved on the main shaft 20 and rotates together with the main shaft 20. One end of the cloth feeding connecting rod 32 is connected with the main shaft 20, and the other end is connected with the cloth feeding shaft 33; preferably, the cloth feeding link 32 is connected to the cloth feeding shaft 33 by a positioning pin 321. The differential cloth feeding crank 34 is fixed on the cloth feeding shaft 33; preferably, the differential feed crank 34 is fixed to the feed shaft 33 by screws. The crank runner 35 is connected to the differential feed crank 34. The feed dog slider 36 is sleeved on the main shaft 20 and rotates together with the main shaft 20. The eccentric shaft 37 is fixed to the housing 10. The first slider 38 is provided on the eccentric shaft 37, and the first slider 38 group is attached to the tip of the feed dog 301. The second slider 39 is connected to the feed dog 301 and is hinged to the crank runner 35. The feed dog carrier 301 includes differential dogs, and the object to be sewn is conveyed by the movement of the differential dogs.
The motion principle is that when the main shaft 20 moves, the eccentric wheel 31 moves along with the main shaft, and the tooth lifting slide block 36 on the main shaft 20 slides in the corresponding sliding groove on the feed dog frame 301. Because the main shaft 20 is eccentric, when the main shaft 20 rotates, the feed dog slide block 36 is driven to move up and down, and the feed dog frame 301 is driven to move up and down. The eccentric wheel 31, the cloth feeding connecting rod 32 and the differential cloth feeding crank 34 form a crank rocker motion. When the eccentric 31 rotates with the main shaft 20, the differential feed crank 34 is driven to perform a reciprocating oscillating motion. The guide rod on the differential cloth feeding crank 34 and the crank sliding sleeve 35 form a moving pair, the second sliding block 39 and the sliding groove on the cloth feeding tooth rack 301 form a moving pair, and the crank sliding sleeve 35 and the second sliding block 39 are hinged at the center. The eccentric shaft 37 is provided with a first slide block 38, and the tail end of the feed dog holder 301 and the first slide block 38 form a moving pair. The eccentric wheel 31 drives the cloth feeding tooth rack 301 to perform left and right cloth feeding movement through the structure. In summary, the feed dog frame 301 moves up and down and moves left and right, and can convey the sewn object to and fro after synthesis, and because the sources for driving the feed dog frame 301 to move up and down and move left and right are the main shafts 20, the time difference can not occur, the distance and the time interval for conveying the sewn object to and fro by the feed dog frame 301 each time are the same, and therefore, the needle pitch values are also the same.
In the garment manufacturing process, it is necessary to obtain an actual needle pitch value of the sewing machine 100 during operation for the purpose of controlling the braid length, automatically adjusting the needle pitch, and the like. However, the current sewing machine 100 has no device for detecting the needle pitch in real time, so that the user cannot obtain the current needle pitch information, and when the needle pitch needs to be adjusted, the user can only rely on experience or multiple tests, and cannot achieve the purpose of quickly adjusting the needle pitch value.
Referring to fig. 4 and 5, fig. 4 is a schematic structural view of a portion of the sewing machine 100 shown in fig. 2; fig. 5 is an exploded view of a portion of the structure shown in fig. 4.
The invention provides a stitch length detection method, which is applied to a sewing machine 100, wherein the sewing machine 100 comprises a cloth feeding component 30, a grating 40 and a photoelectric sensor 50, one of the grating 40 and the photoelectric sensor 50 is arranged on the cloth feeding component 30 and can move along with the cloth feeding component 30, and the other is arranged on a shell of the sewing machine 100; the photoelectric sensor 50 is used for sensing the movement position of the grating 40 and outputting a first signal and a second signal which have the same waveform period and different phase differences; the needle pitch detection method comprises the following steps:
determining the movement direction of the cloth feeding assembly 30 according to the relative position relationship of the waveforms between the first signal and the second signal;
calculating a movement distance of the cloth feeding assembly 30 in one movement direction according to the number of waveform periods of the first signal and the second signal;
the current gauge is determined based on the distance traveled by the feed assembly 30 in one direction of travel.
According to the needle pitch detection method provided by the invention, the grating 40 and the photoelectric sensor 50 are matched to detect the needle pitch value, and the relative motion between the grating 40 and the photoelectric sensor 50 is realized according to the principle that the cloth feeding component 30 has reciprocating motion in the cloth feeding process, so that the needle pitch can be detected in real time. The invention uses the grating 40 and the photoelectric sensor 50 to obtain the current needle pitch according to the signals of the two gratings 40 with the same waveform period but different phase differences, and the grating 40 and the photoelectric sensor 50 have the advantages of high response speed, electromagnetic interference resistance, small size, light weight, good temperature resistance, strong multiplexing capability, long transmission distance, corrosion resistance, high sensitivity, passive devices and the like.
It is understood that the sewing machine 100 may be mounted on the housing 10 or may be disposed in a chamber formed by the housing 10.
In one embodiment of the present invention, the photo sensor 50 is used for sensing a movement position of the grating 40 and outputting a first signal and a second signal having the same waveform period and different phase differences, and includes:
the photoelectric sensor 50 is used for sensing the movement position of the grating 40 and outputting a first signal and a second signal with the same waveform period and a phase difference of 90 degrees.
With such an arrangement, when the cloth feeding assembly 30 turns from the first direction to the second direction, the photoelectric sensor 50 can more rapidly and accurately judge the turning timing of the cloth feeding assembly 30 and calculate the moving distance of the cloth feeding assembly 30 in the first direction, thereby further improving the reliability of the needle pitch detection.
It is understood that the phase difference between the first signal and the second signal may be other than 90 degrees, as long as the difference between the two can be realized, and the moving direction and the moving distance of the cloth feeding assembly 30 can be detected.
Referring to fig. 6 and 7 together, fig. 6 is a schematic diagram illustrating a first signal and a second signal according to an embodiment of the invention; fig. 7 is a schematic view of the movement of the feed beam 33.
In one embodiment of the present invention, the photo sensor 50 is used for sensing a movement position of the grating 40 and outputting a first signal and a second signal having the same waveform period and different phase differences, and includes:
the photoelectric sensor 50 is configured to sense a movement position of the grating 40 and output a first signal and a second signal, where the first signal and the second signal are rectangular wave signals having a phase difference of 90 degrees and the same waveform period.
So set up, use the square wave as the wave form of first signal and second signal, the square wave only has two values of high level and low level, and photoelectric sensor 50 is simpler when detecting, also can be more accurate.
It is understood that the phase difference between the first signal and the second signal may be not a rectangular wave but other waveforms such as a sine wave, a cosine wave, a triangular wave, a sawtooth wave, etc., as long as there is a certain waveform period and the moving direction and the moving distance of the cloth feeding assembly 30 can be detected.
In one embodiment of the present invention, the cloth feeding assembly 30 is a cloth feeding shaft 33, and the needle pitch detection method further comprises, before the step of determining the moving direction of the cloth feeding assembly 30 according to the relative position relationship of the waveforms between the first signal and the second signal:
the grating 40 is fixedly arranged on the cloth feeding shaft 33; alternatively, the first and second electrodes may be,
the cloth feeding assembly 30 is a cloth feeding tooth rack 301, and the needle pitch detection method comprises the following steps before the step of determining the movement direction of the cloth feeding assembly 30 according to the relative position relation of the wave forms between the first signal and the second signal:
the grating 40 is fixedly arranged on the feed dog frame 301; alternatively, the first and second electrodes may be,
the cloth feeding assembly 30 is a cloth feeding crank, and the needle pitch detection method comprises the following steps before the step of determining the motion direction of the cloth feeding assembly 30 according to the relative position relation of the wave forms between the first signal and the second signal:
the grating 40 is fixed on the cloth feeding crank.
By the arrangement, the grating 40 is fixedly arranged on the cloth feeding shaft 33, the cloth feeding tooth rack 301 or the cloth feeding crank, the distances between the three cloth feeding assemblies 30 and the cloth to be processed conveyed by the cloth feeding teeth have accurate mechanical transmission relation, and the measured needle pitch has high precision and small error.
It is understood that the light barrier 40 and the photoelectric sensor 50 can be mounted on other cloth feeding assemblies 30 besides the cloth feeding shaft 33, the cloth feeding gripper 301 and the cloth feeding crank, such as the cloth feeding connecting rod 32, etc., as long as the transmission of the cloth feeding assembly 30 in the sewing machine 100 is not affected and the corresponding needle pitch value can be measured by regular reciprocating motion.
In one embodiment, the grating 40 is disposed on the feed shaft 33, and the photosensor 50 is matched to the grating 40 and is used for outputting the first signal and the second signal. As shown in fig. 5 and 6, the first signal and the second signal are both rectangular waves, and the phase difference between the two signals is 90 degrees. When the cloth feeding assembly 30 moves counterclockwise from the point a to the point B, the interval in which the photoelectric sensor correspondingly outputs the first signal and the second signal is T0 to T2, at the time of T1, the first signal is at the high level, and the second signal changes from the high level to the low level; when the cloth feeding assembly 30 moves to the point B, the corresponding interval of the first signal and the second signal output by the photoelectric sensor is T2 to T3, at this time, the first signal is continuously at the high level, and the second signal changes from the low level to the high level and then to the low level; when the cloth feeding assembly 30 moves clockwise from the point B to the point a, the interval in which the photoelectric sensor outputs the first signal and the second signal is T3 to T5, at the time T4, the first signal is at a high level, and the second signal changes from a low level to a high level. As can be seen, the photoelectric sensors output different signals when the cloth feeding assembly 30 moves clockwise and counterclockwise, and thus, the moving direction of the cloth feeding assembly 30 can be determined. Further, when the cloth feeding shaft 33 moves in a certain direction, the photoelectric sensor counts the edges of the first signal and/or the second signal in an accumulated manner, so that the moving distance of the cloth feeding shaft 33 in a certain direction can be determined. Further, since the feed shaft 33 is mechanically connected to the feed dog 301, the moving distance of the feed shaft 33 corresponds to the gauge value, and thus the current gauge value can be determined.
In one embodiment of the present invention, in order to locate the photoelectric sensor 50 at a fixed position to measure an accurate needle pitch value, the sewing machine 100 further includes a housing 10, and the needle pitch detection method further includes, before the step of determining the moving direction of the cloth feeding assembly 30 according to the relative positional relationship of the waveforms between the first signal and the second signal:
the photoelectric sensor 50 is fixedly mounted on the housing 10.
So set up, photoelectric sensor 50 rigidity, the position change that can accurate detection grating 40, the real-time gauge needle error that records is little, and the degree of accuracy is high.
In one embodiment of the present invention, one of the light barrier 40 and the photoelectric sensor 50 is disposed on the cloth feeding assembly 30 and can move along with the cloth feeding assembly 30, and the other is disposed on a housing of the sewing machine 100, including:
one of the light barrier 40 and the photoelectric sensor 50 is detachably provided on the cloth feeding assembly 30 and can move following the cloth feeding assembly 30, and the other is provided on the housing of the sewing machine 100.
So set up, grating 40 and photoelectric sensor 50 are detachable construction, are convenient for maintain and change. It can be understood that the detachable structure can be in a manner of screw connection, snap connection, fastening, etc., which is not described herein in detail.
In one embodiment of the present invention, the step of disposing the grating 40 on the cloth feed assembly 30 and being capable of following the movement of the cloth feed assembly 30 further comprises:
the grating 40 is disposed on the cloth feeding assembly 30 and can move along with the cloth feeding assembly 30, and the number of the gratings 40 is 100, 180, 360 or 720.
By the arrangement, the number of the gratings 40 can be selected according to different precision requirements, and the requirements of different users are met.
In one embodiment, the distance between the grating 40 and the photosensor 50 is no greater than 8 mm.
So set up, neither influence the motion of work feed subassembly 30, photoelectric sensor 50 can more accurate detection grating 40's change again to output different gauge needle values.
In one embodiment, the sewing machine 100 further comprises a threaded fastener 41, the photoelectric sensor 50 is mounted on the housing 10 by the threaded fastener 41, and the light barrier 40 is fixed on the feed shaft 33 by gluing, clipping or threaded fastener 41.
So set up, grating 40 and photoelectric sensor 50's fixed effectual, photoelectric sensor 50 response precision when the response is high, and the gauge needle value of surveying is accurate. It is understood that in other embodiments, the photoelectric sensor 50 can be fixed on the housing 10 or be embedded in the cavity inside the housing 10 by other means, such as gluing, clipping, riveting, welding, etc.; the grating 40 may also be fixed to the feed beam 33 by other means, such as riveting, welding, etc.
Referring to fig. 8, fig. 8 is a block diagram of a needle pitch detecting device according to the present invention.
The invention also provides a needle pitch detection device, which comprises:
a direction detection module for determining the movement direction of the cloth feeding assembly 30 according to the relative position relationship of the waveforms between the first signal and the second signal;
a distance detection module for calculating a movement distance of the cloth feeding assembly 30 in one movement direction according to the number of waveform periods of the first signal and the second signal;
and a stitch length calculating module for determining a current stitch length according to a moving distance of the cloth feeding assembly 30 in one moving direction.
The invention also provides a sewing machine 100 comprising a memory and a processor, the memory storing a computer program, the processor implementing the steps of the method when executing the computer program.
The invention also provides a computer-readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of the above-mentioned method.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that suitable changes and modifications of the above embodiments are within the scope of the claimed invention as long as they are within the spirit and scope of the present invention.
Claims (10)
1. A stitch length detection method is applied to a sewing machine and is characterized in that the sewing machine comprises a cloth feeding component, a grating and a photoelectric sensor, wherein one of the grating and the photoelectric sensor is arranged on the cloth feeding component and can move along with the cloth feeding component, and the other one is arranged on a shell of the sewing machine; the photoelectric sensor is used for sensing the motion position of the grating and outputting a first signal and a second signal which have the same waveform period and different phase differences; the needle pitch detection method comprises the following steps:
determining the movement direction of the cloth feeding assembly according to the relative position relation of the waveforms between the first signal and the second signal;
calculating the movement distance of the cloth feeding assembly in one movement direction according to the number of waveform periods of the first signal and the second signal;
and determining the current needle pitch according to the movement distance of the cloth feeding assembly in one movement direction.
2. The needle pitch detecting method according to claim 1, wherein the photoelectric sensor is used for sensing a moving position of the grating and outputting a first signal and a second signal having the same waveform period and different phase differences, and comprises:
the photoelectric sensor is used for sensing the motion position of the grating and outputting a first signal and a second signal which have the same waveform period and 90-degree phase difference.
3. The needle pitch detecting method according to claim 2, wherein the photoelectric sensor is used for sensing a moving position of the grating and outputting a first signal and a second signal having the same waveform period and different phase differences, and comprises:
the photoelectric sensor is used for sensing the movement position of the grating and outputting a first signal and a second signal, wherein the first signal and the second signal are rectangular wave signals with 90-degree phase difference and the same waveform period.
4. The gauge detection method of claim 1, wherein the feed assembly is a feed shaft, and the gauge detection method further comprises, before the step of determining the moving direction of the feed assembly based on the relative positional relationship of the waveforms between the first signal and the second signal:
fixedly arranging the grating on a cloth feeding shaft; alternatively, the first and second electrodes may be,
the cloth feeding component is a cloth feeding tooth frame, and the needle pitch detection method comprises the following steps before the step of determining the movement direction of the cloth feeding component according to the relative position relation of the waveform between the first signal and the second signal:
fixedly arranging the grating on the cloth feeding tooth frame; alternatively, the first and second electrodes may be,
the cloth feeding assembly is a cloth feeding crank, and the needle pitch detection method comprises the following steps before the step of determining the movement direction of the cloth feeding assembly according to the relative position relation of the waveforms between the first signal and the second signal:
the grating is fixedly arranged on the cloth feeding crank.
5. The needle space detecting method according to claim 1, wherein the sewing machine further includes a housing, and the needle space detecting method further includes, before the step of determining the moving direction of the cloth feeding assembly based on the relative positional relationship of the waveform between the first signal and the second signal:
and fixedly arranging the photoelectric sensor on the shell.
6. The stitch length detecting method according to claim 1, wherein one of the optical grating and the photoelectric sensor is provided on the cloth feeding assembly and can move along with the cloth feeding assembly, and the other is provided on the sewing machine, and the method comprises:
one of the grating and the photoelectric sensor is detachably arranged on the cloth feeding assembly and can move along with the cloth feeding assembly, and the other one of the grating and the photoelectric sensor is arranged on the sewing machine.
7. The gauge detection method of claim 1, wherein the step of the grating being disposed on the feed assembly and being capable of following the feed assembly further comprises:
the grating is arranged on the cloth feeding assembly and can move along with the cloth feeding assembly, and the number of the gratings is 100, 180, 360 or 720.
8. A gauge detection apparatus, the apparatus comprising:
the direction detection module is used for determining the movement direction of the cloth feeding assembly according to the relative position relation of the waveforms between the first signal and the second signal;
the distance detection module is used for calculating the movement distance of the cloth feeding assembly in one movement direction according to the number of waveform periods of the first signal and the second signal;
and the needle pitch calculation module is used for determining the current needle pitch according to the movement distance of the cloth feeding assembly in one movement direction.
9. A sewing machine comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, carries out the steps of the method according to any one of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
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