CN110093722B - Control method and control system for automatically switching sewing modes in sewing machine - Google Patents
Control method and control system for automatically switching sewing modes in sewing machine Download PDFInfo
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- CN110093722B CN110093722B CN201910487937.9A CN201910487937A CN110093722B CN 110093722 B CN110093722 B CN 110093722B CN 201910487937 A CN201910487937 A CN 201910487937A CN 110093722 B CN110093722 B CN 110093722B
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B19/00—Programme-controlled sewing machines
- D05B19/02—Sewing machines having electronic memory or microprocessor control unit
- D05B19/12—Sewing machines having electronic memory or microprocessor control unit characterised by control of operation of machine
- D05B19/16—Control of workpiece movement, e.g. modulation of travel of feed dog
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B27/00—Work-feeding means
- D05B27/02—Work-feeding means with feed dogs having horizontal and vertical movements
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
- D05D2207/00—Use of special elements
- D05D2207/05—Magnetic devices
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
- D05D2305/00—Operations on the work before or after sewing
- D05D2305/32—Measuring
Abstract
The invention provides a control method and a control system for automatically switching sewing modes in a sewing machine, which are characterized in that when sewing, the current thickness value of a sewing material at a needle is obtained in real time, and the sewing material is judged to be positioned in the nth sewing material thickness interval of N sewing material thickness intervals according to the current thickness value; meanwhile, the current angle value of the main shaft of the sewing machine is obtained, the current angle value of the main shaft of the sewing machine is compared with the angle value of the nth main shaft, and normal sewing is performed if the current angle value of the main shaft of the sewing machine is the same as the angle value of the nth main shaft; if the current angle value of the sewing machine main shaft is the same as the nth positioning angle value, the clutch mechanism is controlled to act to lock the feeding eccentric wheel and the sewing machine main shaft, and sewing is executed. The invention greatly enhances the adaptability of the sewing machine to different fabrics.
Description
Technical Field
The invention relates to the technical field of sewing machines, in particular to a control system and a control method for automatically switching sewing modes in a sewing machine.
Background
In the cloth feeding mechanism of the existing sewing machine, the cloth feeding eccentric wheel is an integrated structure, as shown in figure 1, the cloth feeding eccentric wheel 11 comprises a cloth feeding eccentric part and a feed lifting teeth eccentric part, the whole cloth feeding eccentric wheel 11 is fixed on a main shaft 14, the position and the angle can not be adjusted, a cloth feeding connecting rod 12 is matched on the cloth feeding eccentric part 0, and a feed lifting teeth connecting rod 13 is matched on the feed lifting teeth eccentric part. The eccentric part of the feed lifting tooth transmits power to the feed lifting tooth crank 15 through the connecting rod transmission structure, the eccentric part of the feed feeding tooth transmits power to the tooth holder seat 16 through the connecting rod transmission structure, as shown in fig. 2, the swing of the tooth holder seat 16 mainly affects the displacement S of the feed feeding tooth 17 in the X directionXThe swing of the feed dog crank 15 mainly affects the displacement S of the feed dog 17 in the Y directionY,SXAnd SYThe curve of the rotation angle phi as a function of the spindle 14 is shown in fig. 3.
As shown in FIG. 4, point t1 is the point when the feed dog 17 goes out of the needle plate 18, point t2 is the point when the feed dog 17 goes down the needle plate 18, and the position angle of the existing feed cam 11 relative to the main shaft 14 is not adjustable, so that the position angle is S in FIG. 3XAnd SYIn the function curve of the rotation angle Φ with respect to the main shaft 14, the main shaft rotation angles Φ corresponding to t1 and t2 are fixed.
In the actual sewing process, the mounting angle of the cloth feeding eccentric wheel corresponding to the standard mounting process is suitable for sewing the sewing material with medium thickness, and the adaptability to thick materials and thin materials is relatively poor.
Therefore, a control system and a control method for real-time adjustment of sewing mode according to the thickness of the sewing material are needed.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a control method and a control system for automatically switching a sewing mode in a sewing machine, so as to solve the problem that the sewing machine in the prior art cannot switch the sewing mode of a take-up speed according to a thickness of a cloth.
In order to achieve the above and other related objects, the present invention provides a control method for automatically switching a sewing mode in a sewing machine, the sewing machine including a sewing machine main shaft and a cloth feeding feed dog mechanism, a feed eccentric wheel in the cloth feeding dog mechanism being connected to the sewing machine main shaft through a clutch mechanism, adjusting the clutch mechanism to relatively separate the feed eccentric wheel from the sewing machine main shaft, and changing a cloth feeding timing sequence by rotating the sewing machine main shaft to change a positioning angle between the feed eccentric wheel and the sewing machine main shaft during separation, the control method comprising:
1) presetting N sewing material thickness intervals and N main shaft angle values in a controller of a sewing machine, wherein N is a natural number more than 1; the corresponding relation between the sewing material thickness interval and the main shaft angle value is as follows: each sewing material thickness interval corresponds to a spindle angle value, namely the nth sewing material thickness interval corresponds to the nth spindle angle value, and N is a natural number less than or equal to N;
2) when sewing, acquiring the current thickness value of the sewing material at the needle in real time, and judging that the sewing material is positioned in the nth sewing material thickness interval of the N sewing material thickness intervals according to the current thickness value; meanwhile, the current angle value of the main shaft of the sewing machine is obtained, the current angle value of the main shaft of the sewing machine is compared with the angle value of the nth main shaft, and normal sewing is performed if the current angle value of the main shaft of the sewing machine is the same as the angle value of the nth main shaft; if the current angle value of the sewing machine main shaft is the same as the nth positioning angle value, the clutch mechanism is controlled to act to lock the feeding eccentric wheel and the sewing machine main shaft, and sewing is executed.
Preferably, N sewing modes are further arranged in the controller, and the N sewing modes correspond to the N sewing material thickness intervals one by one; when the current thickness value is judged to be in the nth sewing material thickness interval during sewing, a command of displaying the nth sewing mode corresponding to the nth sewing material thickness interval is output.
Preferably, in the step 2), the specific process of acquiring the current thickness value of the sewing material at the needle in real time is as follows: and acquiring the height change value of a presser bar in the sewing machine in real time, and taking the height change value of the presser bar as the current thickness value of the sewing material.
Preferably, the obtained height change value of the presser bar is obtained by filtering a raised height value of the presser bar, and the filtering is specifically to filter a part caused by a height change of a feed dog of the sewing machine.
Preferably, when the feeding eccentric wheel and the sewing machine spindle are relatively separated and the sewing machine spindle is driven to rotate, the current angle value of the sewing machine spindle is acquired in real time through an angle sensor, the current angle value of the sewing machine spindle is compared with the nth positioning angle value, and if the current angle value of the sewing machine spindle is the same as the nth positioning angle value, the rotation of the sewing machine spindle is stopped; if the two are different, the main shaft of the sewing machine continues to rotate until the two are the same.
The invention also provides a control system for automatically switching sewing modes in a sewing machine, wherein the sewing machine comprises a sewing machine main shaft and a cloth feeding feed lifting tooth mechanism, a feeding eccentric wheel in the cloth feeding feed lifting tooth mechanism is connected with the sewing machine main shaft through a clutch mechanism, and the control system comprises: the first driving piece is connected with the clutch mechanism and used for controlling the clutch mechanism to be locked or unlocked with the sewing machine spindle;
the height detection mechanism is used for acquiring the height change value of the presser foot bar of the sewing machine in real time;
the second driving mechanism is connected with the sewing machine main shaft and is used for driving the sewing machine main shaft to rotate;
and the first driving part, the height detection mechanism and the second driving mechanism are all connected with the controller, and the controller is used for executing the control method for automatically switching the sewing mode in the sewing machine.
Preferably, the second driving mechanism is provided with an angle acquisition module for directly acquiring the current angle value of the main shaft of the sewing machine.
Preferably, the height detection mechanism comprises a fixedly arranged sensor and a sensed element which is arranged on the presser bar and ascends and descends along with the presser bar.
Preferably, the first driving member comprises an electromagnet and an adjusting rod connected with the electromagnet; the clutch mechanism comprises a ratchet wheel, a sliding block and a fixed seat, wherein the fixed seat is provided with a sliding chute, and the sliding block is arranged in the sliding chute in a sliding manner and is provided with a clamping tooth part meshed with the ratchet wheel; the ratchet wheel and the fixed seat are respectively and fixedly connected with one of the feeding eccentric wheel and the sewing machine main shaft; when the electromagnet does not act, the sliding block is kept meshed with the ratchet wheel through the clamping tooth part under the action of the retaining piece, so that the feeding eccentric wheel and the sewing machine spindle are locked; when the electromagnet acts, the adjusting rod drives the sliding block to slide, and the meshing between the tooth clamping part and the ratchet wheel is removed, so that the sewing machine main shaft and the feeding eccentric wheel are relatively separated.
As described above, the control method and the control system for automatically switching the sewing mode in the sewing machine according to the present invention have the following advantages: the current thickness value of the sewing material at the needle position is obtained in real time, and the angle value of the nth main shaft corresponding to the current thickness value is judged and determined through the current thickness value, namely the angle value corresponding to the main shaft of the current sewing machine is determined; meanwhile, the current angle value of the main shaft of the sewing machine is obtained and compared with the angle value of the nth main shaft, and normal sewing is performed if the current angle value is the same as the angle value of the nth main shaft; if the angle values are different, the clutch mechanism is controlled to act to unlock the feeding eccentric wheel and the sewing machine main shaft, the sewing machine main shaft is rotated until the current angle value is the same as the angle value of the nth main shaft, and then the feeding eccentric wheel is used for feedingAnd the sewing machine spindle is unlocked, and the function S of the displacement of the feed dog in the X direction is completedX- Φ "and Y-direction displacement function" SYThe variation of the rotation time sequence of phi' relative to the main shaft greatly enhances the adaptability of the sewing machine to different cloth materials.
Drawings
Fig. 1 is a schematic view of a cloth feeding mechanism of a sewing machine in the prior art.
Fig. 2 is a schematic view of a feed dog actuator in the prior art.
FIG. 3 is a diagram showing the relationship between the X-direction and Y-direction movement displacements of the feed dog and the main shaft of the sewing machine.
Fig. 4 shows a diagram of a prior art feed dog trajectory.
FIG. 5 is a schematic view of a cloth feeding mechanism of the sewing machine according to the present invention.
Fig. 6 shows an exploded view of the clutch mechanism of fig. 5.
Fig. 7 shows a schematic view of the presser foot mechanism of the present invention.
Fig. 8 is a schematic view of the presser foot of the present invention pressing the sewing material.
Fig. 9 is a graph showing the change in height of the presser foot of the present invention over time.
FIG. 10 is a flowchart of a control method for automatically switching sewing modes in the sewing machine according to the present invention.
FIG. 11 is a diagram showing the relationship between the X-direction and Y-direction movement displacements of the feed dog and the main shaft of the sewing machine according to the present invention.
FIG. 12 is a diagram showing the take-up timing of the take-up lever and the cloth feeding timing.
Description of the element reference numerals
1 electromagnet
2 sliding block
201 latch part
3 ratchet wheel
4 fixed seat
401 chute
5 feeding eccentric wheel
6 feeding connecting rod
7 lifting tooth connecting rod
8 Main shaft of sewing machine
17 feed dog
18 needle board
21 adjusting nut
22 pressure spring
23 sensed element
24 inductor
25 connecting seat
26 presser foot bar sleeve
27 presser foot bar
28 presser foot
100 sewing material
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.
Please refer to fig. 1 to 12. It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions that the present disclosure can be implemented, so that the present disclosure is not limited to the technical essence, and any structural modifications, ratio changes, or size adjustments should still fall within the scope of the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
The invention provides a control method for automatically switching sewing modes in a sewing machine, the sewing machine in the embodiment comprises a sewing machine main shaft 8 and a cloth feeding feed lifting tooth mechanism, a feeding eccentric wheel 5 in the cloth feeding feed lifting tooth mechanism is connected with the sewing machine main shaft 8 through a clutch mechanism, the clutch mechanism is adjusted to enable the feeding eccentric wheel 5 and the sewing machine main shaft 8 to be relatively separated, and the positioning angle between the feeding eccentric wheel 5 and the sewing machine main shaft 8 is changed by rotating the main shaft 8 during separation so as to change the cloth feeding time sequence, the control method comprises the following steps: as shown in figure 10 of the drawings,
1) presetting N sewing material thickness intervals and N main shaft angle values in a controller of a sewing machine, wherein N is a natural number more than 1; the corresponding relation between the sewing material thickness interval and the main shaft angle value is as follows: each sewing material thickness interval corresponds to a spindle angle value, namely the nth sewing material thickness interval corresponds to the nth spindle angle value, and N is a natural number less than or equal to N;
2) during sewing, as shown in fig. 7, the current thickness value of the sewing material 100 at the needle position is obtained in real time, and the controller judges that the sewing material is positioned in the nth sewing material thickness interval of the N sewing material thickness intervals according to the current thickness value so as to determine that the main shaft 8 of the sewing machine is positioned at the nth main shaft angle value currently; meanwhile, the current angle value of the sewing machine main shaft 8 is obtained, the controller compares the current angle value of the sewing machine main shaft 8 with the nth main shaft angle value, and normal sewing is performed if the current angle value is the same as the nth main shaft angle value; if the angle values are different, the controller controls the clutch mechanism to act to enable the feeding eccentric wheel 5 and the sewing machine main shaft 8 to be relatively separated, the sewing machine main shaft 8 is driven to rotate, the current angle value of the sewing machine main shaft 8 is obtained in real time until the current angle value of the sewing machine main shaft 8 is the same as the nth positioning angle value, and then the clutch mechanism is controlled to act to enable the feeding eccentric wheel 5 and the sewing machine main shaft 8 to be locked to execute sewing.
The method comprises the steps of obtaining the current thickness value of the sewing material 100 at the needle in real time, judging and determining the nth main shaft angle value corresponding to the current thickness value, namely determining the angle value corresponding to the main shaft of the current sewing machine; simultaneously obtaining the current angle value of the main shaft 8 of the sewing machine and the angle value of the nth main shaft for comparison, if so, obtaining the current angle value of the main shaft 8 of the sewing machine and comparing the current angle value with the angle value of the nth main shaftSewing normally if the sewing is the same; if the angle values are different, the clutch mechanism is controlled to act to unlock the feeding eccentric wheel 5 and the sewing machine main shaft 8, the sewing machine main shaft 8 is rotated until the current angle value is the same as the angle value of the nth main shaft, then the feeding eccentric wheel 5 and the sewing machine main shaft 8 are unlocked, and the X-direction displacement function S of the feed dog is completedX- Φ "and Y-direction displacement function" SYThe variation of the rotation time sequence of phi' relative to the main shaft greatly enhances the adaptability of the sewing machine to different cloth materials.
The specific working principle of the invention is as follows:
as shown in FIG. 11, the function "S" of the displacement of the feed dog 17 in the X direction before and after the operation of the clutch mechanism is controlledXPhi is the curve S1, the displacement function in the Y direction SYΦ "is curve L1; the clutch mechanism is adjusted to unlock the sewing machine main shaft 8 and the feeding eccentric wheel 5, the sewing machine main shaft 8 is rotated to enlarge the positioning angle between the sewing machine main shaft 8 and the feeding eccentric wheel 5, and the X-direction displacement function S of the feed dog 17X- Φ "and Y-direction shift function" SYPhi' are both translated to the right in the drawing sheet on which fig. 11 is located, i.e. the X-direction displacement function "S" of the feed dog 17XPhi 'becomes the curve S3, Y-direction displacement function' SYWhen phi' is changed into a curve L2, the needle plate outlet time t1 and the needle plate inlet time t2 of the feed dog are delayed, namely, the feed operation is delayed; when the clutch mechanism is adjusted to unlock the sewing machine main shaft 8 and the feeding eccentric wheel 5, the sewing machine main shaft 8 is controlled to rotate to reduce the positioning angle between the sewing machine main shaft 8 and the feeding eccentric wheel 5, and the X-direction displacement function S of the feed dog 17X- Φ "and Y-direction shift function" SYPhi' are both translated to the left of the drawing sheet on which fig. 11 is located, i.e. the X-direction displacement function "S" of the feed dog 17XPhi 'becomes the curve S2, Y-direction displacement function' SYWhen Φ "becomes the curve L3, the feed dog advances both at the needle plate exit time t1 and at the needle plate entry time t2, i.e., the feed operation advances.
As shown in fig. 12, after the cloth feeding action is delayed, the thread is not clamped by the sewing material 100 and the needle plate 18 when the take-up lever starts to take up the thread (the left side of fig. 12), the take-up resistance of the take-up lever is small, so that the thread is more easily tightened and is suitable for the thick fabric; when the cloth feeding action is advanced, part of the stitches are clamped by the sewing material 100 and the needle plate 18 when the take-up lever starts to take up the stitches (the right side drawing of fig. 12), so that the take-up resistance of the take-up lever is increased, the stitches are not easy to tighten, and the cloth feeding device is suitable for sewing materials which are thin in thickness and easy to wrinkle.
For convenience of control, N sewing modes are further arranged in the controller, and the N sewing modes correspond to the N sewing material thickness intervals one by one; when sewing, when judging that the current thickness value is in the nth sewing material thickness interval, outputting a command for displaying the nth sewing mode corresponding to the nth sewing material thickness interval; the automatic sewing machine is convenient for operators to check in real time and confirm that the automatic sewing mode of the sewing machine corresponds to the thickness of the sewing material. Namely, each sewing material thickness interval corresponds to a sewing mode, different sewing modes correspond to different positioning angles between the feeding eccentric wheel and the sewing machine main shaft, the positioning angle between the feeding eccentric wheel and the sewing machine main shaft is represented by a main shaft angle value, namely, the nth sewing material thickness interval corresponds to the nth sewing mode, the nth sewing mode corresponds to the nth main shaft angle value, and N is a natural number less than or equal to N.
In the step 2), the specific process of acquiring the current thickness value of the sewing material 100 at the needle in real time is as follows: the height change value of the presser bar 27 in the sewing machine is obtained in real time, and the height change value of the presser bar 27 is used as the current thickness value of the sewing material 100. Preferably, the obtained height variation value of the presser bar 27 is obtained by filtering the raised height value of the presser bar 27, and the filtering is specifically to filter out a part caused by the height variation of the feed dog of the sewing machine.
In this embodiment, as shown in fig. 7, by fixing the sensed element 23 on the presser bar 27 and fixing a sensor 24 on the housing or other fixed device, the sensor 24 can monitor the height change of the sensed element 23 in real time when the sensed element 23 moves up and down along with the presser bar 27. As shown in fig. 8, in operation, the sewing material 100 is placed between the presser foot 28 and the needle plate 18, and after the feed dog 17 starts feeding, the height of the presser foot 28 changes along with the up-and-down motion of the feed dog 17, that is, the real-time presser foot height h monitored by the sensor 24 is a variable.
The current thickness of the sewing material can be obtained by other methods, such as arranging a detecting sensor capable of sensing the thickness of the cloth at the needle plate, and the obtaining of the thickness of the sewing material is the prior art and is not described in detail herein.
Fig. 9 shows a variation of the presser foot height h with respect to time T, where h0 is the thickness of the sewing material, h is the real-time height of the presser foot 28, hmax is the maximum value of the presser foot height, h is h0 when the feed dog 17 is below the needle plate 18, and the presser foot height h varies with the height variation of the feed dog 17 when the feed dog 17 is above the needle plate 18, so that the presser foot height h monitored in real time needs to be filtered, the part caused by the height variation of the feed dog 17 is filtered, and the actual thickness h0 of the sewing material is identified.
In this embodiment, the seam material may be divided into N stages according to the specific size of h 0: [ h0 (1): h0(2) ], [ h0 (2): h0(3) ] … … [ h0 (n-1): h0(n) ]. When the monitored h0 value falls in different gear intervals, the controller controls the clutch mechanism to operate and drives the sewing machine main shaft 8 to rotate according to the detected thickness interval in which the current thickness value is located by the control method, so as to change the change of the phase difference between the sewing machine main shaft and the feeding eccentric wheel, so as to advance or delay the cloth feeding time, and meanwhile, different thickness intervals correspond to different cloth feeding advancing or delaying angle phase differences.
In order to obtain the current angle value of the sewing machine main shaft conveniently, in the process that the feeding eccentric wheel 5 and the sewing machine main shaft 8 are relatively separated and the sewing machine main shaft 8 is driven to rotate, the current angle value of the sewing machine main shaft 8 is obtained in real time through an angle sensor in the embodiment, the current angle value of the sewing machine main shaft 8 is compared with the nth positioning angle value, and if the current angle value of the sewing machine main shaft 8 is the same as the nth positioning angle value, the sewing machine main shaft 8 stops rotating; if different, the sewing machine main shaft 8 continues to rotate until the same.
As shown in fig. 5 to 8, the present invention provides a control system for automatically switching sewing modes in a sewing machine, the sewing machine of the present embodiment has a specific structural part for realizing functions such as sewing, etc. of the existing sewing machine, and besides, it can also execute the above-mentioned control method; in the embodiment, only structural parts relevant to the implementation of the control method are described, and the structural parts comprise a sewing machine main shaft 8 and a cloth feeding and lifting mechanism, wherein a feeding eccentric wheel 5 in the cloth feeding and lifting mechanism is connected with the sewing machine main shaft 8 through a clutch mechanism, a lifting tooth connecting rod 7 and a feeding connecting rod 6 are both connected with the feeding eccentric wheel 5, and the feeding tooth 17 is driven to move under the rotation of the feeding eccentric wheel 5 to implement cloth feeding; the control system includes: the first driving piece is connected with the clutch mechanism and used for controlling the clutch mechanism to be locked or unlocked with the sewing machine spindle 8;
a height detection mechanism for acquiring a height variation value of the presser bar 27 of the sewing machine in real time;
the second driving mechanism is connected with the sewing machine main shaft 8 and is used for driving the sewing machine main shaft 8 to rotate;
and the first driving part, the height detection mechanism and the second driving mechanism are all connected with the controller, and the controller is used for executing the control method for automatically switching the sewing mode in the sewing machine.
In order to obtain the current angle value of the main shaft of the sewing machine, the second driving mechanism of the embodiment is provided with an angle obtaining module for obtaining the current angle value of the main shaft 8 of the sewing machine, such as an angle sensor, which can be a sensor capable of measuring angles, such as an encoder; or the second driving mechanism is a servo motor which can record and display the current angle value rotated by the main shaft 8 of the sewing machine.
As shown in fig. 7, the height detection mechanism in this embodiment includes a fixedly disposed sensor 24, and a sensed element 23 disposed on the presser bar 27 and ascending and descending with the presser bar 27. The presser foot rod sleeve 26 is fixed on the machine shell, the presser foot rod 27 can slide in the presser foot rod sleeve 26 along the axial direction, the bottom end of the presser foot rod 27 is fixed with the presser foot 28, the connecting seat 25 is fixed on the presser foot rod 27, the sensed element 23 is arranged on the connecting seat 25, the pressure spring 22 and the adjusting nut 21 are arranged at the top of the presser foot rod 27, the compression degree of the pressure spring 22 can be adjusted by rotating the adjusting nut 21, so that the pressure borne by the presser foot rod 27 is adjusted, and the compression degree between the presser foot rod 27 and the sewing material 100 is changed. The sensor 24 is fixed on the housing and close to the sensed element 23, and when the sensed element 23 moves up and down along with the presser bar 27, the sensor 24 can monitor the height change of the sensed element 23 in real time. In operation, as shown in fig. 8, the sewing material 100 is placed between the presser foot 28 and the needle plate 18, and after the feed dog 17 starts feeding, the height of the presser foot 28 changes along with the up-and-down motion of the feed dog 17, that is, the sensor 24 monitors the height h of the presser foot in real time.
As an embodiment of a clutch mechanism and a first driving member, in the present embodiment: as shown in fig. 5 and fig. 6, the first driving member includes an electromagnet 1 and an adjusting rod connected to the electromagnet, the clutch mechanism includes a ratchet 3, a sliding block 2, and a fixed seat 4, the fixed seat 4 is provided with a sliding slot 401, and the sliding block 2 is slidably disposed in the sliding slot 401 and has a tooth clamping portion 201 engaged with the ratchet 3; the ratchet wheel 3 and the fixed seat 4 are respectively and fixedly connected with one of the feeding eccentric wheel 5 and the sewing machine main shaft 8, in the embodiment, the ratchet wheel 3 is fixedly connected with the sewing machine main shaft 8 and rotates along with the sewing machine main shaft, and the fixed seat 4 is fixedly connected with the feeding eccentric wheel 5; when the electromagnet 1 is not operated, the sliding block 2 is kept meshed with the ratchet wheel 3 through the clamping tooth part 201 under the action of a retaining piece (the retaining piece is a torsion spring in the embodiment and is not shown in the figure), so that the feeding eccentric wheel 5 and the sewing machine main shaft 8 are locked; when the electromagnet 1 acts, the adjusting rod drives the sliding block 2 to slide along the sliding groove 401, and the chamber clamping tooth part 201 moves towards the direction far away from the sewing machine main shaft 8 to release the meshing between the clamping tooth part 201 and the ratchet wheel 3, so that the sewing machine main shaft 8 and the feeding eccentric wheel 5 are relatively separated.
As another embodiment of a clutch mechanism and a first driving member, the first driving member comprises an electromagnet and a poke rod connected with the electromagnet, the clutch mechanism comprises a sliding assembly and a distance transmission seat connected with the cloth feeding eccentric wheel in a circumferential positioning manner, the sliding assembly comprises a fixed seat fixedly connected with a main shaft of the sewing machine, a sliding member axially sliding with the fixed seat and connected with the fixed seat in a circumferential positioning manner, and a return spring arranged between the sliding member and the fixed seat, when the electromagnet does not act, the sliding member and the distance transmission seat are locked in a circumferential direction under the action of the return spring, so that the main shaft of the sewing machine is locked with the cloth feeding eccentric wheel; when the electromagnet acts, the sliding piece is poked through the poking rod to slide along the axial direction, so that the sliding piece and the distance transmission seat are unlocked.
The structural form of the clutch mechanism is not limited to the above, and the locking and unlocking of the sewing machine main shaft and the feeding eccentric wheel can be realized.
In conclusion, the current thickness value of the sewing material at the needle position is obtained in real time, and the angle value of the nth main shaft corresponding to the current thickness value is judged and determined according to the current thickness value, namely the angle value corresponding to the main shaft of the current sewing machine is determined; meanwhile, the current angle value of the main shaft of the sewing machine is obtained and compared with the angle value of the nth main shaft, and normal sewing is performed if the current angle value is the same as the angle value of the nth main shaft; if the angle values are different, the clutch mechanism is controlled to act to unlock the feeding eccentric wheel and the sewing machine main shaft, the sewing machine main shaft is rotated until the current angle value is the same as the angle value of the nth main shaft, the feeding eccentric wheel and the sewing machine main shaft are unlocked, and the X-direction displacement function S of the feed dog is completedX- Φ "and Y-direction displacement function" SYThe variation of the rotation time sequence of phi' relative to the main shaft greatly enhances the adaptability of the sewing machine to different cloth materials. 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 (9)
1. A control method for automatically switching sewing modes in a sewing machine, wherein the sewing machine comprises a sewing machine main shaft and a cloth feeding and lifting tooth mechanism, and is characterized in that a feeding eccentric wheel in the cloth feeding and lifting tooth mechanism is connected with the sewing machine main shaft through a clutch mechanism, the clutch mechanism is adjusted to enable the feeding eccentric wheel and the sewing machine main shaft to be relatively separated, and a positioning angle between the feeding eccentric wheel and the sewing machine main shaft is changed by rotating the main shaft during separation, so that a cloth feeding time sequence is changed, and the control method comprises the following steps:
1) presetting N sewing material thickness intervals and N main shaft angle values in a controller of a sewing machine, wherein N is a natural number more than 1; the corresponding relation between the sewing material thickness interval and the main shaft angle value is as follows: each sewing material thickness interval corresponds to a spindle angle value, namely the nth sewing material thickness interval corresponds to the nth spindle angle value, and N is a natural number less than or equal to N;
2) when sewing, acquiring the current thickness value of the sewing material at the needle in real time, and judging that the sewing material is positioned in the nth sewing material thickness interval of the N sewing material thickness intervals according to the current thickness value; meanwhile, the current angle value of the main shaft of the sewing machine is obtained, the current angle value of the main shaft of the sewing machine is compared with the angle value of the nth main shaft, and normal sewing is performed if the current angle value of the main shaft of the sewing machine is the same as the angle value of the nth main shaft; if the current angle value of the sewing machine main shaft is the same as the nth positioning angle value, the clutch mechanism is controlled to act to lock the feeding eccentric wheel and the sewing machine main shaft, and sewing is executed.
2. The control method for automatically switching the sewing mode in the sewing machine according to claim 1, characterized in that: n sewing modes are further arranged in the controller, and the N sewing modes correspond to the N sewing material thickness intervals one by one; when the current thickness value is judged to be in the nth sewing material thickness interval during sewing, a command of displaying the nth sewing mode corresponding to the nth sewing material thickness interval is output.
3. The control method for automatically switching the sewing mode in the sewing machine according to claim 1, characterized in that: in the step 2), the specific process of acquiring the current thickness value of the sewing material at the needle in real time is as follows: and acquiring the height change value of a presser bar in the sewing machine in real time, and taking the height change value of the presser bar as the current thickness value of the sewing material.
4. The control method for automatically switching the sewing mode in the sewing machine according to claim 3, characterized in that: the height change value of the presser foot bar is obtained after filtering the lifting height value of the presser foot bar, and the filtering is specifically to filter out the part caused by the height change of the feed dog of the sewing machine.
5. The control method for automatically switching the sewing mode in the sewing machine according to claim 1, characterized in that: when the feeding eccentric wheel and the sewing machine spindle are relatively separated and the sewing machine spindle is driven to rotate, acquiring a current angle value of the sewing machine spindle in real time through an angle sensor, comparing the current angle value of the sewing machine spindle with an nth positioning angle value, and stopping the rotation of the sewing machine spindle if the current angle value of the sewing machine spindle is the nth positioning angle value; if the two are different, the main shaft of the sewing machine continues to rotate until the two are the same.
6. A control system for automatically switching sewing modes in a sewing machine, the sewing machine comprises a sewing machine main shaft and a cloth feeding and lifting tooth mechanism, and is characterized in that a feeding eccentric wheel in the cloth feeding and lifting tooth mechanism is connected with the sewing machine main shaft through a clutch mechanism, and the control system comprises: the first driving piece is connected with the clutch mechanism and used for controlling the clutch mechanism to be locked or unlocked with the sewing machine spindle;
the height detection mechanism is used for acquiring the height change value of the presser foot bar of the sewing machine in real time;
the second driving mechanism is connected with the sewing machine main shaft and is used for driving the sewing machine main shaft to rotate;
a controller, wherein the first driving member, the height detecting mechanism and the second driving mechanism are all connected with the controller, and the controller is used for executing a control method for automatically switching the sewing mode in the sewing machine as claimed in claim 1.
7. The control system for automatically switching the sewing mode in the sewing machine according to claim 6, wherein: the second driving mechanism is provided with an angle acquisition module for directly acquiring the current angle value of the main shaft of the sewing machine.
8. The control system for automatically switching the sewing mode in the sewing machine according to claim 6, wherein: the height detection mechanism comprises a fixedly arranged sensor and a sensed element which is arranged on the presser bar and ascends and descends along with the presser bar.
9. The control system for automatically switching the sewing mode in the sewing machine according to claim 6, wherein: the first driving piece comprises an electromagnet and an adjusting rod connected with the electromagnet; the clutch mechanism comprises a ratchet wheel, a sliding block and a fixed seat, wherein the fixed seat is provided with a sliding chute, and the sliding block is arranged in the sliding chute in a sliding manner and is provided with a clamping tooth part meshed with the ratchet wheel; the ratchet wheel and the fixed seat are respectively and fixedly connected with one of the feeding eccentric wheel and the sewing machine main shaft; when the electromagnet does not act, the sliding block is kept meshed with the ratchet wheel through the clamping tooth part under the action of the retaining piece, so that the feeding eccentric wheel and the sewing machine spindle are locked; when the electromagnet acts, the adjusting rod drives the sliding block to slide, and the meshing between the tooth clamping part and the ratchet wheel is removed, so that the sewing machine main shaft and the feeding eccentric wheel are relatively separated.
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| CN110616510B (en) * | 2019-10-09 | 2021-06-25 | 浙江众邦机电科技有限公司 | Cloth sewing method, device, equipment and medium |
| CN111020890B (en) * | 2019-11-25 | 2021-07-30 | 杰克缝纫机股份有限公司 | Feeding switching device and sewing machine with same |
| CN113445215B (en) * | 2020-03-27 | 2023-01-20 | 杰克科技股份有限公司 | Cloth feeding mechanism with adjustable cloth feeding time sequence and sewing machine |
| CN114086329A (en) * | 2020-08-24 | 2022-02-25 | 杰克科技股份有限公司 | Sewing machine with adjustable thread hooking time of rotating shuttle |
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Address after: 318010 No. 1008, east section of Donghai Avenue, Sanjia, Jiaojiang District, Taizhou City, Zhejiang Province Patentee after: Jack Technology Co.,Ltd. Address before: 318010 No. 15 Airport South Road, Jiaojiang District, Zhejiang, Taizhou Patentee before: JACK SEWING MACHINE Co.,Ltd. |