CN114000271B - Active thread supply device, sewing machine and active thread supply method - Google Patents
Active thread supply device, sewing machine and active thread supply method Download PDFInfo
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- CN114000271B CN114000271B CN202010733611.2A CN202010733611A CN114000271B CN 114000271 B CN114000271 B CN 114000271B CN 202010733611 A CN202010733611 A CN 202010733611A CN 114000271 B CN114000271 B CN 114000271B
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
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- D05B47/00—Needle-thread tensioning devices; Applications of tensometers
- D05B47/04—Automatically-controlled tensioning devices
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Abstract
The invention provides a driving wire supply device which comprises a fixed seat, two wire supply wheels, a wire clamping gap and a driving source, wherein the two wire supply wheels are rotatably arranged on the fixed seat, the wire clamping gap is formed between the outer peripheral surfaces of the two wire supply wheels, and the driving source is arranged on the fixed seat, is connected with the wire supply wheels and drives the wire supply wheels to rotate. The active thread supply device can convey the thread to the machine needle when the sewing machine needs the thread, so that the thread supply amount of the thread is larger than the thread demand amount, the thread can still be in a loose state when a component in the sewing machine pulls the thread, the thread tension of the thread is low, the thread can easily slide from the surface of the component in the sewing machine in a state of lower thread tension instead of being pulled to forcibly drag the surface of the component in the sewing machine like the prior art, the thread is prevented from being damaged or even broken, the requirements on the surface smoothness and the installation accuracy of the thread passing component in direct contact with the thread in the sewing machine are reduced, and the manufacturing cost of the sewing machine is finally reduced.
Description
Technical Field
The invention relates to an active wire supply device.
The invention also relates to a sewing machine provided with the active thread supply device.
The invention also relates to an active thread supply method for the sewing machine.
Background
The sewing machine is generally provided with a thread clamping device and a thread take-up mechanism, and the upper thread penetrates through the thread clamping device and the thread take-up mechanism and then penetrates into a machine needle. The structure of the thread clamping device can participate in the thread clamping device disclosed in the Chinese utility model patent with the application number of 201920411036.7 or refer to the thread clamping device of the sewing machine disclosed in the Chinese invention patent application with the application number of 201810436759.2. The existing sewing machine controls the stitch by adjusting the tension of a thread clamping device, controls the thread supply length of each stitch to form the stitch, and can say that the thread tension of each thread is fixed.
When a sewing machine is used for sewing, such as a flat sewing machine, instantaneous tension is generated on a sewing thread in each stitch when a sewing needle with the sewing thread penetrates through a sewing material, when the sewing thread is hooked by a rotating shuttle, when the appearance of a shuttle frame in the rotating shuttle expands a thread loop, when a feeding mechanism pulls the sewing thread, and when a thread take-up mechanism takes up the sewing thread. Therefore, in the existing sewing machine, only when the action executed by the relevant mechanism in the sewing machine generates tension on the upper thread, the upper thread is pulled and moves for a certain distance along with the acting force, namely, the existing sewing machine can only supply the thread passively.
Furthermore, the above-mentioned action of pulling the upper thread for many times in the process of forming each stitch causes the tension of the upper thread to suddenly increase and change for many times. In addition, in the forming process of each stitch, the tension variation curve of the upper thread is not smooth like a parabolic curve of a thread supply curve and a thread demand curve, but the tension variation curve continuously changes suddenly with various actions of pulling the upper thread, each sudden change has a tension peak, and the peaks test the breaking strength of the upper thread. Or, the tension of the upper thread can be changed stably by one less action of pulling the upper thread, and the breakage probability of the upper thread is lower. However, in the conventional sewing machine, the action of pulling the upper thread for many times in the process of forming each stitch is indispensable and cannot be reduced.
Furthermore, when the thread is picked up by the thread picking mechanism in the sewing machine, the upper thread is taken up from the thread hooking mechanism below the needle plate, the stitch is loosened to be tightened, and the tension of the upper thread is gradually tightened by the thread passing pieces in the sewing machine in the process; when the feeding mechanism in the sewing machine finishes feeding, the take-up lever in the take-up mechanism reaches the highest point, the upper thread is tensioned by all the thread passing pieces, and the stitch reaches the optimal state. Above-mentioned in-process, each crosses the process that the line piece all once made upper thread tension increase to the take-up of upper thread, crosses the line piece more, and the line is said more complicated, and the number of times that upper thread tension changes is just more, and the resistance when the upper thread is received the line is just also big more, and the clamp fastener just need increase to the clamp force of upper thread to offset the resistance of receiving the line, tightens up the suture from this. However, the more thread passing members in the sewing machine, the more complicated the thread path, and the higher the probability of forming a defective stitch and breaking the thread.
Further, as is known, the surface of a solid body is always defective, and the conventional sewing machine expands the thread loop of the upper thread by the cooperation of the shape, contour, motion and the like of the parts, thereby pulling the upper thread to allow the upper thread to be passively fed and form a stitch. In the above process, the upper thread is forcibly passed through the surface of the part in a pulled state. When the surface of the part is burred, worn and even slightly uneven, when the upper thread wire ring is enlarged, the surface defects of the part can damage the upper thread, cause wire breakage and continuously damage the upper thread. Therefore, very high requirements are imposed on the surface finish, mounting accuracy, etc. of the thread passing member in direct contact with the thread in the sewing machine, and the processing cost of the thread passing member is increased. Such as: the highest rotating speed of the lower shaft and the rotating shuttle of the flat sewing machine is 10000 r/min, and the sewing thread is continuously dragged forcibly from the abrasion gap between the rotating shuttle and the shuttle frame guide rail, so the processing requirement of the sewing machine on the rotating shuttle is extremely high at present, the price of some rotating shuttles is as high as 1000 RMB/RMB, and the price is extremely expensive.
Furthermore, the suture is formed by twisting a plurality of strands of yarn in a left-hand or right-hand way; in the prior art, tension is provided by a wire clamping spring which is abutted against a wire clamping plate, the wire clamping plate clamps a suture, and the suture is forcibly pulled from between two wire clamping plates of the wire clamping device, so that the twist of the suture can be damaged, and the twist of the suture is uneven. When the suture is split due to fiber problems or uneven twist, thick, long and broken strands are pushed backwards along with the consumption of the suture, the twist of the suture is further damaged, untwisting and hard knots are formed, the hard knots jump over a wire clamp when accumulated to a certain degree, and the tension is suddenly increased; while the two ends of the suture are continuously threaded, and twisting is necessary when the twisting is released until the suture is broken. Namely: untwisting is carried out from the thread clamping device to the sewing thread of the needle section, and twisting is carried out from the thread clamping device to the sewing thread of the thread frame section. Therefore, when the machine stops each time the thread take-up mechanism picks up the thread, we see that the thread is necessarily damaged, and it is not only the thread passing piece that galling the thread, but also the thread gripper that damages the thread.
Twisting, untwisting, and unraveling of the suture to some extent, causing the loops to become unstable, biased forward or backward; when the thread hooking mechanism hooks the thread, the silk thread or the thick thread ring is easy to hook only one part of the thread, so that the thread is split; the thread ring of the fine cotton thread or the fine polyester thread can be distorted and deformed to cause the skipping stitch and the thread breakage; when the thread take-up lever takes up the thread, a butterfly-shaped stitch floating point can be formed after the twisted thread is twisted; the hard knots also cause floating points in the stitches, with a greater chance of direct breakage.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides an active thread feeding device, which can perform active thread feeding, avoid the damage of the suture thread and reduce the probability of thread breakage.
In order to achieve the purpose, the invention provides an active wire supply device which comprises a fixed seat, two wire supply wheels, a wire clamping gap and a driving source, wherein the two wire supply wheels are rotatably arranged on the fixed seat, the wire clamping gap is formed between the outer peripheral surfaces of the two wire supply wheels, and the driving source is arranged on the fixed seat and is connected with the wire supply wheels to drive the wire supply wheels to rotate.
Furthermore, two the line wheel that supplies is initiative line wheel and driven line wheel that supplies respectively, the driving source links to each other with initiative line wheel that supplies, drives initiative line wheel bidirectional rotation.
Further, the driving source is a motor, and the driving wire supply wheel is fixed on a motor shaft of the motor.
Further, the driving wire supply wheel comprises a wheel main body part and a wheel connecting part axially extending out of one end of the wheel main body part, the wheel connecting part is fixed with a motor shaft of the motor through a screw, and a wire clamping gap is formed between the wheel main body part and the outer peripheral surface of the driven wire supply wheel.
Further, the wheel main part includes wire clamping portion and the anticreep line portion of connection at wire clamping portion both ends, be formed with between the outer peripheral face of wire clamping portion and the outer peripheral face of driven wire feed wheel wire clamping gap, the external diameter of anticreep line portion is greater than the external diameter of wire clamping portion, two the anticreep line portion is located the outside at driven wire feed wheel both ends respectively, and anticreep line portion is close to driven wire feed wheel.
Further, the fixing seat comprises a first fixing plate and a second fixing plate which are connected, the driving source is fixed on the first fixing plate, and the driven wire supply wheel is rotatably installed on the second fixing plate.
Furthermore, a supporting shaft is fixed in the second fixing plate, the supporting shaft is parallel to the central axis of the driving wire supply wheel, and the driven wire supply wheel is rotatably arranged on the supporting shaft through a bearing.
The application also provides a sewing machine, including the casing with as above initiatively supply the line device, initiatively supply the fixing base of line device to install on the casing.
The present application further provides an active thread feeding method using the sewing machine as described above, comprising the steps of:
s1, connecting a driving source of an active thread supply device and a main motor in a sewing machine with an electronic control module of the sewing machine, wherein a thread supply angle area is stored in the electronic control module of the sewing machine and corresponds to a corner of the main motor in the sewing machine;
s2, starting the sewing machine to operate, wherein an electric control module of the sewing machine acquires a real-time corner of the main motor and judges whether the real-time corner of the main motor is in a thread supply angle area or not;
when the electronic control module of the sewing machine judges that the real-time corner of the main motor is in the thread supply angle area, the electronic control module of the sewing machine sends an instruction to the driving source of the active thread supply device, the driving source of the active thread supply device drives the thread supply wheel to rotate, so that the active thread supply device executes the thread supply state of conveying the thread to the machine needle, and the thread is in a loose state.
As described above, the active thread supplying apparatus, the sewing machine and the active thread supplying method according to the present invention have the following advantageous effects:
the active thread supply device in the application can be applied to supplying threads on the upper thread (upper thread), can also be applied to supplying threads on the looper thread (lower thread or bottom thread), and can also be independent of the sewing machine. The sewing machine can convey the thread to the machine needle when the thread is required to be supplied, so that the thread supply amount of the thread is larger than the thread demand amount, the thread can still be in a loose state when a component in the sewing machine pulls the thread, the thread tension of the thread is low, and the thread can easily slide from the surface of the component in the sewing machine in a state of lower thread tension instead of being pulled to forcibly drag the thread to the surface of the component in the sewing machine like the prior art, thereby avoiding the thread from being damaged or even broken, reducing the requirements on the surface smoothness and the installation accuracy of the thread passing component in the sewing machine in direct contact with the thread, and finally reducing the manufacturing cost of the sewing machine. Meanwhile, the active thread supply device can control the thread supply speed and the thread supply time, and the adjustment of the thread supply amount and the thread supply tension during sewing is met.
Drawings
Fig. 1 to 3 are schematic structural diagrams of the active wire supply device in the present application at different viewing angles.
(wherein the stitches are omitted in FIGS. 1 and 2.)
FIG. 4 is a diagram showing the relationship between the operation of the active thread supplying device and the operation of the sewing machine according to the present application.
Description of the element reference
10. Fixed seat
11. First fixing plate
12. Second fixing plate
20. Wire clamping gap
30. Driving source
40. Active wire supply wheel
41. Wheel body
411. Wire clamping part
412. Anti-drop wire part
42. Wheel connection
50. Driven wire feeding wheel
60. Supporting shaft
70. Limiting clamp spring
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, proportions, and dimensions shown in the drawings and described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims, but rather by the claims. In addition, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description only and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship thereof may be made without substantial technical changes and modifications.
The application provides a sewing machine, this sewing machine includes the casing and initiatively supplies the line device, initiatively supplies line device fixed mounting on the casing. Besides, the sewing machine also comprises an electric control module and a main motor for driving a main shaft in the sewing machine to operate, wherein the main motor is connected with the electric control module, and the electric control module can control the operation of the main motor and can obtain the real-time rotation angle of the main motor.
As shown in fig. 1 to 3, the active wire supply device according to the present application includes a fixed seat 10, two wire supply wheels rotatably mounted on the fixed seat 10, a wire clamping gap 20 formed between the outer circumferential surfaces of the two wire supply wheels, and a driving source 30 mounted on the fixed seat 10; the fixed seat 10 can be directly fixed on the sewing machine shell, and can also be fixed on the sewing machine shell through a bracket and the like, so that the fixed seat 10 is installed on the sewing machine shell, and the active thread supply device is integrally installed on the shell; the driving source 30 is connected with the wire feeding wheel and drives the wire feeding wheel to rotate.
Based on the sewing machine with the active thread supply device, the application also provides an active thread supply method, the active thread supply method uses the sewing machine with the active thread supply device, and the active thread supply method comprises the following steps:
s1, connecting a driving source 30 of an active thread supply device with an electric control module of a sewing machine, wherein a thread supply angle area is stored in the electric control module of the sewing machine in advance and corresponds to a corner of a main motor in the sewing machine;
s2, starting the sewing machine to operate, and acquiring a real-time corner of the main motor by an electric control module of the sewing machine and judging whether the real-time corner of the main motor is in a thread supply angle area or not; when the electronic control module of the sewing machine judges that the real-time corner of the main motor is in the thread supply angle area, the electronic control module of the sewing machine sends an instruction to the driving source 30 of the active thread supply device, the driving source 30 of the active thread supply device drives the thread supply wheel to rotate, so that the active thread supply device executes the thread supply state of conveying the thread to the machine needle, and the thread is in a loose state.
Therefore, the active thread supplying device in the application can be applied to supplying threads on the upper thread (upper thread) and supplying threads on the curved needle thread (lower thread or bottom thread). The sewing machine can convey the thread to the machine needle when the thread is required to be supplied, so that the thread supply amount of the thread is larger than the thread demand amount, the thread can still be in a loose state when a component in the sewing machine pulls the thread, the thread tension of the thread is low, and the thread can easily slide from the surface of the component in the sewing machine in a state of lower thread tension instead of being pulled to forcibly drag the thread to the surface of the component in the sewing machine like the prior art, thereby avoiding the thread from being damaged or even broken, reducing the requirements on the surface smoothness and the installation accuracy of the thread passing component in the sewing machine in direct contact with the thread, and finally reducing the manufacturing cost of the sewing machine.
Further, there are various structures for connecting the driving source 30 to the wire feeding wheel and driving the wire feeding wheel to rotate. Such as: the driving source 30 has two driving lines which respectively drive the two line-supplying lines to rotate, the rotating directions of the two line-supplying lines are opposite, and at the moment, the two line-supplying lines are both driving line-supplying lines 40. Alternatively, one of the driving sources 30 drives one of the two wire supply wheels to rotate, and the other wire supply wheel rotates along with the other wire supply wheel in a contact fit manner, wherein the two wire supply wheels are the driving wire supply wheel 40 and the driven wire supply wheel 50 respectively. In this embodiment, the two wire feeding wheels are a driving wire feeding wheel 40 and a driven wire feeding wheel 50 respectively, as shown in fig. 1 to fig. 3, the driving source 30 is a motor, the driving wire feeding wheel 40 is fixed on a motor shaft of the motor, the driving source 30 is connected with the driving wire feeding wheel 40, the driven wire feeding wheel 50 is rotatably mounted on the fixing seat 10, an outer circumferential surface of the driven wire feeding wheel 50 is in contact fit with an outer circumferential surface of the driving wire feeding wheel 40, and a wire clamping gap 20 is formed between the outer circumferential surface of the driven wire feeding wheel 50 and the outer circumferential surface of the driving wire feeding wheel 40.
Further, the motor shaft of the motor can rotate in both directions, taking the view angle shown in fig. 3 as an example: when the motor shaft of the motor rotates in the positive direction, the motor drives the driving wire supply wheel 40 to rotate clockwise, the driving wire supply wheel 40 drives the driven wire supply wheel 50 to rotate anticlockwise, the driving wire supply wheel and the driven wire supply wheel are matched to drive a suture to move leftwards, the suture is conveyed towards the direction close to the machine needle, and the driving wire supply device executes the action of driving wire supply. When the motor shaft of the motor rotates reversely, the motor drives the driving wire supply wheel 40 to rotate anticlockwise, the driving wire supply wheel 40 drives the driven wire supply wheel 50 to rotate clockwise, the driving wire supply wheel and the driven wire supply wheel are matched to drive the suture to move rightwards, the suture is conveyed in the direction far away from the machine needle, and the driving wire supply device executes the action of actively taking up the wire. Therefore, the active thread supply device can realize active thread supply and active thread take-up and can be well matched with actions of material pricking, thread hooking, feeding, thread picking and the like in a sewing machine. When the active thread supply device executes active thread take-up, the generated thread take-up amount can meet the thread take-up amount required by the sewing machine, the sewing machine can be not provided with a thread picking mechanism, namely, the sewing machine is only provided with the active thread supply device capable of actively supplying and actively taking up threads. When the active thread supplying device executes active thread taking-up, the produced thread taking-up amount can not meet the required thread taking-up amount of the sewing machine, a thread picking mechanism can be configured in the sewing machine, and the thread picking mechanism is provided with a plurality of thread passing pieces. In addition, because the active thread supply device has the functions of active thread supply and active thread take-up, the active thread supply device controls the feeding of the thread through the actions of the active thread supply and the active thread take-up, and finally controls the thread supply length of each stitch through setting the difference value between the thread supply amount and the thread take-up amount, instead of controlling the stitch through controlling the thread clamping force of the thread clamp in the prior art. Thus, the tension of the suture in this application need not be maintained at all times, i.e.: through the cooperative operation of all large mechanisms of the sewing machine, in an interval of a main shaft of the sewing machine rotating for 360 degrees for a circle, only in an interval needing to take up the thread, an electric control module of the sewing machine controls an active thread supply device to take up the thread actively, so that the thread is tensioned to finish the stitch, and the thread is in a loose state in other most angle intervals.
Further, as shown in fig. 1 to 3, the fixing base 10 includes a first fixing plate 11 and a second fixing plate 12 connected to each other, the driving source 30 is fixed to the first fixing plate 11, the driving wire feeding wheel 40 is fixed to an output shaft of the driving source 30, the driven wire feeding wheel 50 is rotatably mounted on the second fixing plate 12, and the arrangement between the first fixing plate 11 and the second fixing plate 12 is the same as the arrangement between the driving wire feeding wheel 40 and the driven wire feeding wheel 50. The connection structure between the driven wire supply wheel 50 and the second fixing plate 12 is as follows: a support shaft 60 is fixed in the second fixing plate 12, the support shaft 60 is parallel to the central axis of the driving wire-supplying wheel 40, and the driven wire-supplying wheel 50 is rotatably mounted on the support shaft 60 through a bearing. Preferably, the support shaft 60 is further fixed with a limit clamp spring 70, the limit clamp spring 70 is located at the end of the driven wire feeding wheel 50, and the limit clamp spring 70 axially limits the driven wire feeding wheel 50.
Further, as shown in fig. 1 and 2, the driving wire supplying wheel 40 includes a wheel main body 41 and a wheel connecting portion 42 axially extending from one end of the wheel main body 41 away from the first fixing plate 11, the wheel connecting portion 42 is fixed to the motor shaft of the motor by a screw, the wire clamping gap 20 is formed between the wheel main body 41 and the outer circumferential surface of the driven wire supplying wheel 50, and the outer diameter of the wheel connecting portion 42 is smaller than the outer diameter of the wheel main body 41. Preferably, the wheel main body 41 includes a wire clamping portion 411 and wire dropping prevention portions 412 connected to both ends of the wire clamping portion 411, the wire clamping portion 411 and the driven wire-feeding wheel 50 are both cylindrical, a wire clamping gap 20 is formed between an outer circumferential surface of the wire clamping portion 411 and an outer circumferential surface of the driven wire-feeding wheel 50, an outer diameter of the wire dropping prevention portions 412 is larger than an outer diameter of the wire clamping portion 411, the two wire dropping prevention portions 412 are respectively located outside both ends of the driven wire-feeding wheel 50, and the wire dropping prevention portions 412 are adjacent to the driven wire-feeding wheel 50, so that a suture can be prevented from dropping from the wire clamping gap 20.
Furthermore, the sewing machine equipped with the active thread supply device can be flat sewing machine, overedger, double-needle machine, other special machine types and the like, the active thread supply device has the functions of active thread supply and active thread take-up, can completely replace the original thread clamping assembly in the sewing machine, and can be used for both thread supply and thread supply. Under the condition that the active take-up quantity of the active take-up of the active thread supply device meets the condition, the active thread supply device can replace an original thread take-up mechanism in the sewing machine. Through the active thread supply device and the active thread supply action executed by the active thread supply device, thread paths are simplified, thread tension of the sewing threads is reduced, thread twist is protected from being damaged, thread breakage probability of the sewing threads is reduced, floating points are reduced, thread splitting probability of the sewing threads is reduced, the sewing threads are not easy to break on a worn thread hooking mechanism, and manufacturing cost of the sewing machine is reduced. The working principle of the active thread feeding device will be described in detail below by taking a lockstitch sewing machine as an example.
For example, the flat sewing machine comprises a machine shell, a main shaft driven by the main motor to rotate, a needle rod mechanism and a thread picking mechanism which are arranged at the left end of the main shaft, a lower shaft parallel to the main shaft, a transmission mechanism connected between the main shaft and the lower shaft, a rotating shuttle (namely a thread hooking mechanism) fixed at the left end of the lower shaft, a tooth rack, feeding teeth fixed on the tooth rack, a feeding mechanism connected between the main shaft and the tooth rack, the active thread supply device and an electric control module; the driving source 30 in the main motor and the active power supply device are connected with the electric control module; the main motor drives the main shaft to synchronously rotate, and the rotating angle of the main motor is the same as that of the main shaft; the needle bar mechanism, the thread picking mechanism and the feeding mechanism are driven by a main shaft to move, the main shaft drives a lower shaft to rotate through a transmission mechanism, the lower shaft drives a rotating shuttle to rotate, a machine needle in the needle bar mechanism reciprocates up and down and is matched with the rotating motion of the rotating shuttle to sew, and stitches are formed on sewing materials; the upper thread passes through the thread clamping gap 20 of the active thread supplying device.
In the process that the main motor drives the main shaft to synchronously rotate clockwise for 360 degrees for one turn to form a stitch, as shown in fig. 4, the area of the rotating angle of the main motor from 23 degrees to 157 degrees is a material piercing area W1, and a needle in the material piercing area W1 carries an upper thread to pierce downwards through a sewing material; the region of the rotation angle of the main motor which rotates clockwise from 117 degrees to 212 degrees is a thread hooking region W2, and the rotating shuttle hooks a thread ring formed by the upper thread in the thread hooking region W2; the region of the rotation angle of the main motor from 209 degrees to 335 degrees clockwise is a thread picking region W3, and a thread picking mechanism in the thread picking region W3 acts and tightens the upper thread; the area where the rotation angle of the main motor is clockwise changed from 201 degrees to 360 degrees and then clockwise changed to 23 degrees is a feeding area W4, and feeding teeth in the feeding area W4 upwards emerge from tooth grooves of the needle plate and upwards push up the sewing materials. Therefore, in the process that the main motor drives the main shaft to synchronously rotate clockwise for one circle 360 degrees, the upper thread needs to be supplied at least in the material pricking area W1, and the upper thread needs to be tightened at least in the thread taking-up area W3. Preferably, in this embodiment, the electronic control module of the sewing machine stores a thread supply angle area and a thread take-up angle area, the thread supply angle area is 0 to alpha and 335 to 360 degrees, the thread take-up angle area is 209 to 335 degrees, and alpha is any angle value in the interval of 157 to 209 degrees, that is, the thread supply angle area covers all the needle bar areas W1 and the front part thread hooking area W2, and the thread take-up angle area covers the rear part thread hooking area W2 and all the thread picking areas W3. When the electronic control module of the sewing machine judges that the real-time corner of the main motor is in the thread supply angle area in the operation process of the sewing machine, the electronic control module of the sewing machine controls the driving source 30 of the active thread supply device to rotate in the positive direction, and the active thread supply device executes the action of active thread supply; when the electronic control module of the sewing machine judges that the real-time corner of the main motor is in the take-up angle area, the electronic control module of the sewing machine controls the driving source 30 of the active thread supply device to rotate reversely, and the active thread supply device executes the active take-up action.
Specifically, as shown in fig. 4, when the main motor drives the main shaft to rotate clockwise from 0 °, the active thread feeding device feeds the upper thread and the active thread to the needle direction, and the upper thread is in a loose state. The main motor drives the main shaft to rotate to 117 degrees along with the continuous operation of the sewing machine, the rotating shuttle hooks a thread loop formed by the upper thread, at the moment, the active thread supplying device still executes the action of active thread supplying to supply more thread supplying amount, so that the thread supplying amount of the sewing machine is larger than the required thread supplying amount, and the action of the rotating shuttle hook generates tension to the upper thread and simultaneously the upper thread still keeps a loose state. The main motor drives the main shaft to rotate to alpha (namely any angle value in the range of 157-209 degrees), the active wire supply device starts to perform active wire take-up action, at the moment, the rotating shuttle is still in a wire hooking state, but before the rotating shuttle takes off the wire, the active wire take-up action of the active wire supply device can slightly tighten the wire loop, so that the stability of the wire loop during the wire take-off process is ensured; the active thread supply device executes the action of active thread take-up and tightens the stitches by matching with the feeding action of the feeding teeth. The main motor drives the main shaft to rotate to 335 degrees, and the active thread supply device starts to execute the active thread supply action to prepare for the circulation of the next stitch. When every stitch is formed and the rotating shuttle initially hooks the thread, the thread tension of the upper thread which keeps a loose state is extremely low, the upper thread slides easily from the surface of a part of the rotating shuttle and a gap, and the thread ring is enlarged, instead of the prior art that the upper thread is pulled to forcibly drag the surface of the part of the rotating shuttle and the gap, the influence of the surface quality of the part of the rotating shuttle on the upper thread is small, and the thread is not easy to break even if the surface of the part of the rotating shuttle is slightly burred. Therefore, the thread breakage probability of the sewing machine with active thread supply is greatly lower than that of the sewing machine with passive thread supply in the prior art, so that a low-cost thread hooking mechanism, such as a low-cost rotating shuttle, a low-cost curved needle and the like, can be used, and the manufacturing cost of the sewing machine is greatly reduced.
The active thread supply device can actively supply more thread supply amount, so that the thread hooking mechanism can complete thread hooking in the state that the upper thread is loose. The thread feeding amount and the thread receiving amount of the driving thread feeding device are realized by controlling the driving source 30 by the electric control module by adopting a certain rotating speed, the outer diameter of the thread clamping part 411 in the driving thread feeding wheel 40 and the outer diameter of the driven thread feeding wheel 50, so that the driving thread feeding device is independent of a main motor of the sewing machine, and the driving thread feeding device has any thread feeding time, thread feeding amount, thread receiving time and thread receiving amount. The electric control module of the sewing machine controls the rotation of the driving source 30 of the active thread supply device, the thread winding tension is generated only when the thread trace of the sewing machine needs to be tightened, the thread winding tension of the thread is very low in other times, and the thread winding time is controllable.
Further, the active thread supply device in this application is under the drive of motor, by the contact surface between active thread supply wheel 40 and the passive thread supply wheel roll and drive the suture and remove, realizes active thread supply and active receipts line, and it makes two thread clamps press from both sides the active thread supply device of tight suture with the thread clamp spring among the prior art, and this application can not destroy the degree of twist of suture. The thread supply length of each stitch is determined by an electric control module of the sewing machine, the thread supply lengths of the single threads of each stitch are equal, and stitch floating points cannot occur. In addition, the electric control module of the sewing machine can also accurately control the thread consumption of each stitch with different thickness and different stitch length, so that the sewing machine is ensured to perform sewing under low tension all the time.
In summary, the active thread supplying device and the sewing machine equipped with the active thread supplying device have the following advantages:
1. the thread is low in tension, and can provide a thread supply amount larger than a thread demand amount, so that when the thread hooking mechanism expands a thread ring, the thread is not tightened, the thread hooking mechanism can hook the thread in a loose state of the thread, and the tension of the thread is greatly reduced; moreover, low tension means low probability of breakage, better stitches, and more elastic stitches.
2. The sewing machine has the advantages of being free of any thread supply amount, any thread take-up amount, any thread supply time and any thread take-up time, having the parameters set through the electric control module of the sewing machine, and having extremely high degree of freedom.
3. The thread take-up mechanism can actively take up threads, has the same function as the thread take-up mechanism, can simplify the thread take-up mechanism and the thread path, and further reduces the thread tension and the friction force of the sewing machine.
4. The low-cost rotating shuttle and the low-cost thread hooking mechanism can be used, and the manufacturing cost of the sewing machine is reduced.
5. The twist of the suture cannot be damaged, the integrity of the supplied suture is kept, the stability of the wire loop is kept, and the probability of needle skipping, wire breakage and wire splitting is reduced.
6. The length of each thread formed by each stitch can be set and controlled, so as to reduce the floating point probability of lock stitch and beautify stitch.
Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (8)
1. An active wire supply device is characterized in that: the wire feeding device comprises a fixed seat (10), two wire feeding wheels which are rotatably arranged on the fixed seat (10), a wire clamping gap (20) formed between the outer peripheral surfaces of the two wire feeding wheels, and a driving source (30) arranged on the fixed seat (10), wherein the driving source (30) is connected with the wire feeding wheels and drives the wire feeding wheels to rotate; the two wire supply wheels are respectively a driving wire supply wheel (40) and a driven wire supply wheel (50), the driving source (30) is connected with the driving wire supply wheel (40) and drives the driving wire supply wheel (40) to rotate in two directions, and the suture is driven to be conveyed towards the direction close to the machine needle or is driven to be conveyed towards the direction far away from the machine needle.
2. The active wire supply device of claim 1, wherein: the driving source (30) is a motor, and the driving wire supply wheel (40) is fixed on a motor shaft of the motor.
3. The active wire supply device of claim 2, wherein: the driving wire supply wheel (40) comprises a wheel main body part (41) and a wheel connecting part (42) axially extending from one end of the wheel main body part (41), the wheel connecting part (42) is fixed with a motor shaft of a motor through a screw, and a wire clamping gap (20) is formed between the wheel main body part (41) and the outer peripheral surface of the driven wire supply wheel (50).
4. The active wire supply device of claim 3, wherein: wheel main part (41) are including pressing from both sides line portion (411) and connect anticreep portion (412) at pressing from both sides line portion (411) both ends, be formed with between the outer peripheral face of pressing from both sides line portion (411) and the outer peripheral face of driven wire feed wheel (50) press from both sides line clearance (20), the external diameter of anticreep portion (412) is greater than the external diameter of pressing from both sides line portion (411), two anticreep portion (412) are located the outside at driven wire feed wheel (50) both ends respectively, just anticreep portion (412) are close to driven wire feed wheel (50).
5. The active wire supply device of claim 1, wherein: the fixing seat (10) comprises a first fixing plate (11) and a second fixing plate (12) which are connected, the driving source (30) is fixed on the first fixing plate (11), and the driven wire feeding wheel (50) is rotatably installed on the second fixing plate (12).
6. The active wire supply device of claim 5, wherein: a supporting shaft (60) is fixed in the second fixing plate (12), the supporting shaft (60) is parallel to the central axis of the driving wire supply wheel (40), and the driven wire supply wheel (50) is rotatably arranged on the supporting shaft (60) through a bearing.
7. A sewing machine, includes casing, its characterized in that: further comprising an active thread supply device according to any one of claims 1 to 6, the holder (10) of which is mounted on the housing.
8. An active wire supply method is characterized in that: using the sewing machine of claim 7, the active thread supply method comprising the steps of:
s1, a driving source (30) of an active thread supply device and a main motor in a sewing machine are connected with an electric control module of the sewing machine, and a thread supply angle area is stored in the electric control module of the sewing machine and corresponds to a corner of the main motor in the sewing machine;
s2, starting the sewing machine to operate, wherein an electric control module of the sewing machine acquires a real-time corner of the main motor and judges whether the real-time corner of the main motor is in a thread supply angle area or not;
when the electronic control module of the sewing machine judges that the real-time corner of the main motor is in the thread supply angle area, the electronic control module of the sewing machine sends an instruction to the driving source (30) of the active thread supply device, the driving source (30) of the active thread supply device drives the thread supply wheel to rotate, so that the active thread supply device executes the thread supply state of conveying the thread to the machine needle, and the thread is in a loose state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010733611.2A CN114000271B (en) | 2020-07-27 | 2020-07-27 | Active thread supply device, sewing machine and active thread supply method |
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| CN202010733611.2A CN114000271B (en) | 2020-07-27 | 2020-07-27 | Active thread supply device, sewing machine and active thread supply method |
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| CN116536858B (en) * | 2022-12-19 | 2024-01-23 | 上海富山精密机械科技有限公司 | Wire tension self-balancing device, self-balancing method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4703706A (en) * | 1987-02-17 | 1987-11-03 | Denis Plante | Elastic band feeding and tensioning mechanism for a sewing machine |
| JP5339110B2 (en) * | 2005-11-17 | 2013-11-13 | ヤマトミシン製造株式会社 | Sewing thread supply device |
| BRPI1001249A2 (en) * | 2009-03-27 | 2016-02-16 | Zhejiang Champion Mechanical & Electrical Technology Co Ltd | supply device for spiral embroidery machine |
| CN201605438U (en) * | 2009-12-23 | 2010-10-13 | 浙江飞鹰缝制设备有限公司 | Computerized embroidery machine with tension adjusting belt embroidery |
| CN102061577B (en) * | 2011-01-21 | 2013-04-10 | 佛山市源田床具机械有限公司 | Turntable upper thread supply system of quilting embroidery machine |
| CN104120547B (en) * | 2014-08-06 | 2017-10-31 | 苏州市豪杰机械电子设备有限公司 | A kind of control method of the automatic thread handling system of sewing machine |
| JP2019166038A (en) * | 2018-03-23 | 2019-10-03 | ブラザー工業株式会社 | sewing machine |
| CN209456681U (en) * | 2019-01-07 | 2019-10-01 | 安徽杰羽制鞋机械科技有限公司 | A kind of tension force of facial suture stabilising arrangement on sewing machine |
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Address after: 318010 No. 1008, east section of Donghai Avenue, Sanjia, Jiaojiang District, Taizhou City, Zhejiang Province Applicant after: Jack Technology Co.,Ltd. Address before: 318010 No. 1008, east section of Donghai Avenue, Sanjia, Jiaojiang District, Taizhou City, Zhejiang Province Applicant before: JACK SEWING MACHINE Co.,Ltd. |
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