CN105887371B - Sewing machine bottom line detection system and detection method - Google Patents
Sewing machine bottom line detection system and detection method Download PDFInfo
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- CN105887371B CN105887371B CN201610446174.XA CN201610446174A CN105887371B CN 105887371 B CN105887371 B CN 105887371B CN 201610446174 A CN201610446174 A CN 201610446174A CN 105887371 B CN105887371 B CN 105887371B
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- bobbin
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B59/00—Applications of bobbin-winding or -changing devices; Indicating or control devices associated therewith
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
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- Sewing Machines And Sewing (AREA)
Abstract
The invention provides a bobbin thread amount detection system of a sewing machine, which has a simple structure and can detect whether a bobbin thread runs out or not in time, and comprises a bottom plate, a rotating shuttle and an electric control module, wherein the rotating shuttle is provided with a bobbin case and a bobbin, and the bobbin comprises a winding post and two flanges; the flange is made of hard reflective material; the outer surface of at least one of the two flanges is provided with an inclined part which is inclined towards the outer edge of the flange, and the inclined part is provided with a concave groove; the outer wall of the bobbin case is provided with a light transmission hole, and the inclined part or the groove is exposed out of the light transmission hole; the sensor comprises a transmitter and a receiver, the receiver and the transmitter of the sensor are opposite to the groove, the angles of the reflected light rays of the groove and the inclined part are different, the groove can reflect the light rays back into the receiver, and the inclined part cannot reflect the light rays back into the receiver; the sensor is connected with a signal processing module, and the signal processing module is connected with the electric control module.
Description
Technical Field
The invention belongs to the technical field of sewing machines, and particularly relates to a sewing machine bottom line detection system and a detection method.
Background
Modern sewing machines are available in various types, and are used in households and various special industrial production, but the basic principle is not changed, and all the sewing machines have a sewing needle which reciprocates up and down and carries a needle thread to penetrate through a sewing object, and the sewing object is fixed by interlocking with a bottom thread carried by a rotating shuttle (a swinging shuttle) which rotates (swings) below the sewing object.
At present, rotating shuttles are arranged in a bottom plate and are positioned below a needle plate, and a user cannot well judge whether a bottom thread is used up or not in the process of sewing fabrics by a sewing machine, and generally, the user observes whether the bottom thread is used up or not by naked eyes. Because people's reaction time limits, when the user sees the bottom line and uses up, in fact the sewing machine aircraft nose drives the eedle and has run for a period of time empty, can make the surface fabric appear one row of not having the cavity of stitch seam like this, and then cause frequent reworking phenomenon, greatly reduced sewing efficiency. If the fabric is expensive leather or other precious materials, the fabric can be wasted irreversibly.
Therefore, the chinese utility model patent CN104018298B discloses a sewing machine bottom thread detection device, wherein the bobbin is rotatably disposed in the bobbin case, the flange of the bobbin is provided with a first surface portion and a second surface portion, the first surface portion is made of light-absorbing material, the second surface portion is made of light-reflecting material, and the light-absorbing material and the light-reflecting material are both adhered to the surface of the flange. The receiver and the transmitter of the sensor are each directed towards the first or second surface portion exposed at the light-transmitting aperture. In the running process of the bobbin, the bobbin rubs with the bobbin case, and the reflective material and the light-absorbing material adhered to the surface of the flange are scraped or even separated, so that the accuracy of bottom line detection is influenced.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a bottom thread amount detection system of a sewing machine, which has a simple structure and long service life and can detect whether bottom threads run out or not in time.
The purpose of the invention is realized as follows:
a bobbin thread detection system of a sewing machine comprises a bottom plate, a rotating shuttle and an electric control module, wherein the rotating shuttle is installed in the bottom plate, the electric control module is used for controlling a motor, a bobbin case and a bobbin core accommodated in the bobbin case are arranged on the rotating shuttle, and the bobbin core comprises a winding post and flanges arranged at two ends of the winding post; the flange is made of hard reflective materials; the outer surface of at least one of the two flanges is provided with an inclined part which is inclined towards the outer edge of the flange, and the inclined part is provided with a concave groove; the outer wall of the bobbin case is provided with a light transmitting hole, and the inclined part or the groove is exposed out of the light transmitting hole; the sensor comprises a transmitter for transmitting light and a receiver for receiving light, the receiver and the transmitter of the sensor are opposite to the groove exposed out of the light-transmitting hole, the angles of the reflected light of the groove and the inclined part are different, the groove can reflect the light back into the receiver, and the inclined part cannot reflect the light back into the receiver; the sensor is connected with a signal processing module, and the signal processing module is connected with the electric control module.
The invention is further configured to: the inclined portion forms an included angle of 5-30 degrees with the outer surface of the flange.
The invention is further configured to: the outer surfaces of the two flanges are provided with the inclined portion and the groove.
The invention is further configured to: the grooves on the outer surfaces of the two flanges are oppositely arranged.
The invention is further configured to: the groove is provided at an outer edge of the flange.
The invention is further configured to: the winding post and the two flanges are integrally arranged and are I-shaped, and a shaft hole is formed in the center of the winding post.
The invention is further configured to: the receiver and the transmitter are integrally arranged.
The invention is further configured to: the signal processing module is integrated on a circuit board, and the circuit board is fixed on the sensor.
A method for detecting the quantity of the bottom thread of a sewing machine comprises the system for detecting the quantity of the bottom thread of the sewing machine, and the method for detecting the quantity of the bottom thread of the sewing machine sequentially comprises the following steps:
A. the electric control module judges whether the sewing machine is in a sewing state, and if the sewing machine is in the sewing state, the step B is carried out;
B. the emitter of the sensor emits light to the inclined part or the groove exposed out of the light-transmitting hole, and the receiver of the sensor only receives the emitted light reflected from the groove exposed out of the light-transmitting hole;
C. the signal processing module receives and processes the signal from the sensor receiver and then outputs a result signal, and the electric control module receives the result signal and controls whether the motor rotates or not according to the result signal.
When the signal transmitted to the signal processing module by the sensor receiver is a pulse signal formed by high levels and low levels which are distributed at intervals, and the result signal is the motion state of the shuttle peg, the electronic control module judges that the bobbin thread is not used up and controls the motor to continue rotating;
when the signal transmitted to the signal processing module by the sensor receiver is a linear signal formed by a high level or a low level, and the result signal is in a 'bobbin static state', the electronic control module judges that the bobbin thread is used up and controls the motor to stop rotating.
Compared with the prior art, the invention has the outstanding and beneficial technical effects that:
in the bobbin thread amount detection method for the sewing machine, the sensor is arranged on the bottom plate and faces the groove, so that the receiver of the sensor can timely receive reflected light rays from the groove, the signal processing module outputs a result signal according to a signal output by the receiver of the sensor, namely a signal whether a bobbin has a bobbin thread or not is output, and the electronic control module determines whether the bobbin needs to be replaced or not according to the result signal, so that the detection method can timely detect whether the bobbin thread is used up or not in real time, the waste and reworking frequency of fabrics is avoided, and the sewing efficiency and the sewing quality are improved.
Meanwhile, the original path reflection of the light emitted by the emitter is realized through the arrangement of the groove, so that the receiver can timely receive the reflected light from the groove, and the inclined part can reflect the light emitted by the emitter at a certain angle, so that the receiver of the sensor cannot receive the reflected signal; therefore, the arrangement of a reflective material or a light absorption material is not needed, the production processes are reduced, the influence of the performance of the reflective material or the light absorption material is avoided, and the use is convenient.
Drawings
FIG. 1 is a schematic view of the construction of the bobbin case of the present invention;
FIG. 2 is a schematic view of the construction of the bobbin of the present invention;
FIG. 3 is a cross-sectional view of the bobbin of the present invention;
FIG. 4 is a schematic view of a bobbin thread amount detecting system of the sewing machine according to the present invention;
FIG. 5 is a flowchart of a method for detecting the amount of lower thread in the sewing machine according to the present invention;
FIG. 6 is a signal output by the sensor receiver when the bobbin thread is not used up in the present invention;
FIG. 7 is a signal output by the sensor receiver when the bobbin thread is used up in the present invention;
fig. 8 is a schematic diagram of the signal processing circuit of the present invention.
The reference numbers in the figures mean:
1-bobbin case; 11-light hole; 2-a bobbin; 21-a flange; 22-a winding post; 23-an inclined portion; 24-a groove; 25-shaft hole.
Detailed Description
The invention is further described in the following by way of specific embodiments in conjunction with the following drawings:
referring to fig. 1 to 8, a bobbin thread detecting system for a sewing machine includes a base plate, a rotating shuttle installed in the base plate, and an electric control module for controlling a motor, wherein the rotating shuttle is provided with a bobbin case 1 and a bobbin 2 accommodated in the bobbin case 1, and the bobbin 2 includes a winding post 22 and flanges 21 provided at both ends of the winding post 22; the flange 21 is made of hard reflective materials; an inclined part 23 which is inclined towards the outer edge of the flange 21 is arranged on the outer surface of at least one flange 21 of the two flanges 21, and a concave groove 24 which is inwards concave is arranged on the inclined part 23; the outer wall of the bobbin case 1 is provided with a light hole 11, and the inclined part 23 or the groove 24 is exposed out of the light hole 11; the sensor comprises a transmitter for transmitting light and a receiver for receiving light, wherein the receiver and the transmitter of the sensor are opposite to the groove 24 exposed out of the light hole 11, the angles of the reflected light of the groove 24 and the inclined part 23 are different, the groove 24 can reflect the light back into the receiver, and the inclined part 23 cannot reflect the light back into the receiver; the sensor is connected with a signal processing module, and the signal processing module is connected with the electric control module; the arrangement of the groove 24 realizes the original path reflection of the light emitted by the emitter, so that the receiver can timely receive the reflected light from the groove 24, and the arrangement of the inclined part 23 can realize the reflection of the light emitted by the emitter at a certain angle, so that the receiver of the sensor can not receive the reflected signal; therefore, the arrangement of a reflective material or a light absorption material is not needed, the production processes are reduced, the influence of the performance of the reflective material or the light absorption material is avoided, and the use is convenient.
Further setting the following steps: the included angle a between the inclined part 23 and the outer surface of the flange 21 is 5-30 degrees, so that after the signal of the reflector is reflected, the receiver does not receive the signal any more, meanwhile, the contact abrasion between the flange 21 and the bobbin case 1 is reduced, and the service life is further prolonged; while the height H of the inclined portion 23 is 1/2 of the height H of the flange 21; this increases the structural strength of the flange 21 while avoiding the formation of a knife edge due to the thickness of the flange 21 being too thin after the provision of the inclined portion 23, which could damage the thread on the bobbin 2 and thus protect it.
Further setting the following steps: the outer surfaces of the two flanges 21 are provided with the inclined portion 23 and the groove 24, so that the speed of installing the bobbin 2 can be increased, the surfaces of the groove 24 and the inclined portion 23 are not required to be considered during installation, and the two surfaces are universal.
Further setting as follows: the grooves 24 on the outer surface of the two flanges 21 are arranged opposite to each other, so that the centrifugal force of the flanges 21 when the bobbin 2 rotates can be reduced, and the stability of the rotation of the bobbin 2 can be increased.
Further setting the following steps: the groove 24 is formed in the outer edge of the flange 21, and the cross section of the groove 24 is a minor arc in this embodiment, so that the bobbin 2 and the bobbin case 1 can be conveniently mounted, the bobbin 2 can conveniently rotate in the bobbin case 1, and the light-transmitting hole 11 of the bobbin case 1 does not need to be specially formed, so that the production and the processing are convenient.
Further setting the following steps: wrapping post 22 and two flange 21 an organic whole set up and be the I shape, wrapping post 22's center is equipped with shaft hole 25, in this embodiment wrapping post 22 and two flange 21 are the aluminium material and make, are convenient for production and processing like this, and the aluminium material quality is lighter, and sound construction, reflection of light nature is good, and the machine-shaping of being convenient for.
Further setting the following steps: the receiver and the transmitter are integrally arranged to reduce the size of the sensor, so that the sensor can be conveniently installed in the limited space of the sewing machine. In addition, the receiver is an infrared receiver, and the emitter is an infrared emitter. The receiver and transmitter may be of a split construction, as the mounting conditions permit.
Further setting the following steps: the signal processing module is integrated on a circuit board, and the circuit board is fixed on the sensor.
A method for detecting the quantity of bottom thread of a sewing machine comprises the system for detecting the quantity of bottom thread of the sewing machine, and the method for detecting the quantity of bottom thread of the sewing machine sequentially comprises the following steps:
A. the electric control module judges whether the sewing machine is in a sewing state, and if the sewing machine is in the sewing state, the step B is carried out;
B. the emitter of the sensor emits light to the inclined part 23 or the groove 24 exposed from the light-transmitting hole 11, and the receiver of the sensor receives only the emitted light reflected from the groove 24 exposed from the light-transmitting hole 11;
C. the signal processing module receives and processes the signal from the sensor receiver and then outputs a result signal, and the electric control module receives the result signal and controls whether the motor rotates or not according to the result signal.
When the signal transmitted to the signal processing module by the sensor receiver is a pulse signal formed by high levels and low levels which are distributed at intervals, and the result signal is the motion state of the shuttle peg 2, the electric control module judges that the bobbin thread is not used up and controls the motor to continue to rotate;
when the signal transmitted to the signal processing module by the sensor receiver is a linear signal formed by a high level or a low level, and the result signal is in a 'bobbin 2 static state', the electronic control module judges that the bobbin thread is used up and controls the motor to stop rotating.
In the sewing process of the sewing machine, if the bottom thread wound on the shuttle peg 2 is not used up, the upper thread and the bottom thread are interwoven to finish the sewing work and form a stitch on the fabric, at the moment, the bottom thread pulls the shuttle peg 2 to rotate under the traction of the upper thread, namely the shuttle peg 2 is in a moving state; if the bobbin thread wound on the bobbin 2 is used up, it is equivalent to the bobbin thread being disengaged from the bobbin 2, so that the bobbin 2 is no longer pulled by the bobbin thread to rotate, i.e., the bobbin 2 is in a stationary state. Therefore, in the bobbin thread amount detecting system and method of the sewing machine according to the present invention, it is determined whether the bobbin 2 is used up or not by determining whether the bobbin 2 is in a moving state or in a stationary state during the sewing. Specifically, during the sewing process, the sensor continuously emits a light signal to the surface of the bobbin 2 exposed out of the light hole 11, if the bobbin 2 is not used up, the bobbin 2 is in a moving state, at the moment, the inclined part 23 and the groove 24 continuously pass through the light hole 11 at intervals, because the reflection angles of the inclined part 23 and the groove 24 to the light emitted by the sensor emitter are different, the groove 24 can reflect the light back to a receiver for receiving, the inclined part 23 reflects the light to another angle to make the receiver incapable of receiving, the light received by the sensor receiver is in a rule of existence, nonexistence, existence and nonexistence …, and the final output signal of the sensor is a pulse signal; if the bobbin 2 is in a stationary state, only the groove 24 or the inclined portion 23 is exposed from the light hole 11, so that the light received by the sensor receiver is a linear signal. The signal processing module receives and processes the signal from the sensor receiver and outputs a result signal according to whether the signal is a pulse signal or a linear signal, and the electric control template controls whether the motor needs to be stopped according to the result signal output by the signal processing template.
In the above-mentioned bobbin thread quantity detecting system and detecting method, the launcher and receiver of the sensor are faced the recess 24 exposed from the light hole 11 of the bobbin case 1, the sensor and recess 24 are mutually cooperated with one another with good ability, the sensor can receive the light reflected by the recess 24 in time and really, its reaction rate is fast, the degree of sensitivity is high, the electric control template can control the motor to stop rotating in the first time when the bobbin thread is used up, make the sewing machine stop sewing, change the bobbin thread in time, thus guarantee can not appear a row of holes without stitch on the facing material, and then greatly reduce the rework caused by not finding out the bobbin thread is used up in time, the phenomenon that the facing material is wasted, finally guarantee sewing efficiency and sewing quality.
Preferably, the user can also set the number of movement turns of the bobbin 2 in advance, and when the number of movement turns of the bobbin 2 reaches the set value, the sewing machine cuts the thread and stops the movement. Precisely, the number of turns of the bobbin 2 can be set in advance, and in the sewing process of the sewing machine, the bobbin 2 is pulled by the bottom thread to rotate under the traction of the upper thread, namely the bobbin 2 is in a motion state; specifically, during the sewing process, the sensor continuously emits light signals to the surface of the bobbin 2 exposed out of the light hole 11, at the moment, the inclined part 23 and the groove 24 continuously pass through the light hole 11 at intervals, the groove 24 can reflect the light back to a receiver to receive the light due to different reflection angles of the inclined part 23 and the groove 24 to the light emitted by the sensor emitter, the inclined part 23 reflects the light to another angle to prevent the receiver from receiving the light, and the light received by the sensor receiver is in a rule of existence, nonexistence, existence and nonexistence …, the existence is a period, or the nonexistence is a period, and the period is a circle of the bobbin; the signal processing module receives and processes the signal from the sensor receiver, and when the signal received by the signal processing module is consistent with the set number of turns of the shuttle peg, the electric control template controls the motor to stop according to a result signal output by the signal processing template.
Preferably, as shown in fig. 8, the signal processing module includes an amplifying circuit template, a filter plate conditioning circuit module and a processor module, the signal finally acquired by the sensor belongs to a weak small signal, and the weak small signal is amplified by the amplifying circuit module to be an enhanced signal; the filtering and conditioning circuit module receives the enhanced signal from the amplifying circuit template and carries out filtering processing on the enhanced signal, so that the output waveform is very stable and pure, and the accuracy and the reliability of the subsequent processor for processing the signal are improved; the processor receives the signal from the filtering and conditioning circuit template, judges whether the signal is a pulse signal or a linear signal and outputs a result signal, and the electric control module controls whether the motor operates according to the result signal, namely whether the sewing machine stops or continues to work.
In addition, in the method for detecting the amount of thread of the bottom thread of the sewing machine related to the invention, as shown in fig. 5, the signal processing module processes the signal collected by the sensor on the premise that the sewing machine is in a sewing state, if the processor in the signal processing module judges that the sewing machine is in sewing work, the signal processing module sends a PWM signal to drive the sensor to work, and simultaneously carries out real-time sampling judgment on the returned sensor signal, and then outputs a result signal which considers that the bobbin 2 is in a moving state or a static state; in fig. 5, an output result signal 1 is a result signal of "bobbin moving state", and an output result signal 2 is a result signal of "bobbin stationary state".
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. A bobbin thread detection system of a sewing machine comprises a bottom plate, a rotating shuttle and an electric control module, wherein the rotating shuttle is installed in the bottom plate, the electric control module is used for controlling a motor, a bobbin case and a bobbin core accommodated in the bobbin case are arranged on the rotating shuttle, and the bobbin core comprises a winding post and flanges arranged at two ends of the winding post; the method is characterized in that: the flange is made of hard reflective materials; the outer surface of at least one of the two flanges is provided with an inclined part which is inclined towards the outer edge of the flange, and the inclined part is provided with a concave groove; the outer wall of the bobbin case is provided with a light transmitting hole, and the inclined part or the groove is exposed out of the light transmitting hole; the sensor comprises a transmitter for transmitting light and a receiver for receiving light, the receiver and the transmitter of the sensor are opposite to the groove exposed out of the light-transmitting hole, the angles of the reflected light of the groove and the inclined part are different, the groove can reflect the light back into the receiver, and the inclined part cannot reflect the light back into the receiver; the sensor is connected with a signal processing module, and the signal processing module is connected with the electric control module.
2. The sewing machine bobbin thread detecting system according to claim 1, wherein: the inclined portion forms an angle of 5-30 degrees with the outer surface of the flange.
3. The sewing machine bobbin thread detecting system according to claim 1 or 2, wherein: the outer surfaces of the two flanges are provided with the inclined portion and the groove.
4. The sewing machine bottom line detection system according to claim 3, wherein: the grooves on the outer surfaces of the two flanges are oppositely arranged.
5. The sewing machine bottom line detecting system according to claim 1, 2 or 4, wherein: the groove is provided at an outer edge of the flange.
6. The sewing machine bottom line detection system according to claim 1, 2 or 4, wherein: the wrapping post and the two flanges are integrally arranged and are I-shaped, and a shaft hole is formed in the center of the wrapping post.
7. The sewing machine bottom line detection system according to claim 1, 2 or 4, wherein: the receiver and the transmitter are integrally arranged.
8. The sewing machine bobbin thread detecting system according to claim 7, wherein: the signal processing module is integrated on a circuit board, and the circuit board is fixed on the sensor.
9. A method for detecting the amount of thread on the bottom line of a sewing machine is characterized in that: the sewing machine bottom thread detecting system comprising the sewing machine bottom thread detecting method as claimed in claim 1, 2, 4 or 8, comprising the steps of:
A. the electric control module judges whether the sewing machine is in a sewing state, and if the sewing machine is in the sewing state, the step B is carried out;
B. the emitter of the sensor emits light to the inclined part or the groove exposed out of the light-transmitting hole, and the receiver of the sensor only receives the emitted light reflected from the groove exposed out of the light-transmitting hole;
C. the signal processing module receives and processes the signal from the sensor receiver and then outputs a result signal, and the electric control module receives the result signal and controls whether the motor rotates or not according to the result signal.
10. The thread amount detecting method of a sewing machine bobbin thread according to claim 9, wherein: when the signal transmitted to the signal processing module by the sensor receiver is a pulse signal formed by high levels and low levels which are distributed at intervals, and the result signal is the motion state of the shuttle peg, the electronic control module judges that the bobbin thread is not used up and controls the motor to continue rotating; when the signal transmitted to the signal processing module by the sensor receiver is a linear signal formed by a high level or a low level, and the result signal is in a 'bobbin static state', the electronic control module judges that the bobbin thread is used up and controls the motor to stop rotating.
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| CN201610446174.XA CN105887371B (en) | 2016-06-17 | 2016-06-17 | Sewing machine bottom line detection system and detection method |
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| CN201610446174.XA CN105887371B (en) | 2016-06-17 | 2016-06-17 | Sewing machine bottom line detection system and detection method |
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| CN107099949B (en) * | 2017-05-25 | 2022-11-18 | 杭州琦星机器人科技有限公司 | Bobbin thread detection device, bobbin thread detection method, and sewing machine |
| CN107151873A (en) * | 2017-07-12 | 2017-09-12 | 杰克缝纫机股份有限公司 | Bottom line detection method, system, device and control device for industrial sewing machine |
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