CN109629126B - Presser foot pressure adjusting method based on overedger - Google Patents

Abstract

The invention relates to a presser foot pressure adjusting method based on an overedger, which comprises the following steps: presetting an initial pressure; manually adjusting the manual adjusting piece until the pressure between the presser foot and the needle plate accords with the preset value; feeding cloth; detecting the thickness of cloth in real time in the cloth feeding process; working pressure is calculated according to the cloth thickness, and the presser foot pressure is automatically adjusted through the presser foot pressure adjusting mechanism. According to the presser foot pressure adjusting method based on the overedger, the pressure of the presser foot plate and the needle plate is adjusted in real time in the sewing process so as to match fabrics with different thicknesses, so that the sewing machine is smooth and easy when the excessive thickness of the fabric passes through the peduncles, and the phenomena of uneven stitch and fabric wrinkling are improved.

Description

Presser foot pressure adjusting method based on overedger

Technical Field

The invention relates to the technical field of sewing, in particular to a presser foot pressure adjusting method based on an overedger.

Background

The overedger is mainly used for overlock sewing of textiles and has wide application in the sewing field. The pressure regulating mechanism of the presser foot of the existing overedger is generally suitable for lifting and lowering the presser foot through elasticity of a pressure spring, and generates pressure to enable the presser foot to press cloth, so that the sewing is facilitated. Because the elasticity of the pressure spring is different when the pressure spring is extended or shortened, when the sewn fabric is thickened from thin or a stem seam appears, the pressure of the presser foot is increased, so that the sewn fabric can not pass smoothly, and the phenomenon of blocking is caused, so that the sewing machine has the problems of thread blockage, fabric fold, uneven stitch and the like.

Therefore, when a common overedger is used for sewing some uneven fabrics, the quality of the sewn products is often poor or the sewn products are scrapped.

Disclosure of Invention

Based on the above, it is necessary to provide a presser foot pressure adjusting method based on the overedger for solving the technical problem that the overedger is not uniform in sewing some fabrics.

In order to achieve the above purpose, the present invention adopts the following technical scheme: the presser foot pressure adjusting method based on the overedger comprises the following steps:

presetting an initial pressure;

Manually adjusting the manual adjusting piece until the pressure between the presser foot and the needle plate accords with the preset value;

feeding cloth;

Detecting the thickness of cloth in real time in the cloth feeding process;

Working pressure is calculated according to the cloth thickness, and the presser foot pressure is automatically adjusted through the presser foot pressure adjusting mechanism.

In one embodiment, the presser foot pressure adjustment mechanism comprises:

the force application piece is used for automatically adjusting the pressure of the presser foot;

a driving mechanism for driving the force application member to move along the axial direction of the force application member;

the manual adjusting piece is movably connected with the force application piece and is used for manually adjusting the pressure of the presser foot;

a locking member for maintaining the relative position between the manual adjustment member and the urging member;

And the elastic force guide piece is acted between the manual adjusting piece and the presser foot.

In one embodiment, the driving mechanism is a stepper motor, the stepper motor is linked with the force application member through a transmission mechanism, and the transmission mechanism comprises:

a worm connected with the output shaft of the stepping motor,

The transmission arm swings around a fixed axis, one end of the transmission arm is provided with transmission teeth meshed with the worm, and the other end of the transmission arm is connected with the force application piece.

In one embodiment, the force application member is an internal thread sleeve, and the manual adjustment member is inserted into the internal thread sleeve and is in threaded fit with the internal thread sleeve.

In one embodiment, the locking member is a lock nut, and the lock nut is mounted on the manual adjustment member and abuts against the axial end face of the internal thread sleeve.

In one embodiment, a connecting handle is fixed on the outer wall of the internal thread sleeve, and the pin shaft is arranged on the connecting handle in a penetrating mode.

In one embodiment, the outer periphery of the manual adjusting piece is provided with a limiting step, the elastic force guide piece is a spiral spring, one end of the spiral spring abuts against the presser foot, and the other end of the spiral spring is sleeved on the manual adjusting piece and abuts against the limiting step.

In one embodiment, the overedger further includes a thickness detection module for detecting a thickness of the fabric.

In one embodiment, the thickness detection module comprises a hall element and a magnetic piece, the hall element and the magnetic piece are mutually matched, and the thickness detection module detects the thickness of the cloth through a hall principle.

In one embodiment, the thickness detection module includes at least one of an ultrasonic distance sensor, an infrared distance sensor, an optical distance sensor, and a pressure sensor.

According to the presser foot pressure adjusting method based on the overedger, the pressure of the presser foot plate and the needle plate is adjusted in real time in the sewing process so as to match fabrics with different thicknesses, so that the sewing machine is smooth and easy when the excessive thickness of the fabric passes through the peduncles, and the phenomena of uneven stitch and fabric wrinkling are improved.

Drawings

FIG. 1 is a schematic perspective view of an overedger according to one embodiment of the present invention;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a schematic perspective view of the adjusting mechanism of FIG. 1 with a press bar sleeve;

FIG. 4 is a schematic view of the adjusting mechanism of FIG. 3 without a press rod sleeve;

FIG. 5 is a schematic view of a portion of the pressure adjustment mechanism of FIG. 3;

FIG. 6 is a schematic diagram of the explosive structure of FIG. 5;

FIG. 7 is a schematic view of the structure of the actuator arm of FIG. 5;

FIG. 8 is a schematic view of the presser foot mechanism of FIG. 3;

fig. 9 is a schematic flow chart of a presser foot pressure adjustment method based on an overedger according to one embodiment of the present invention.

Description of the main reference signs

The following detailed description further illustrates the invention with reference to the accompanying drawings.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It will be understood that when an element is referred to as being "mounted" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1-8, an embodiment of the present invention provides an overedger, which includes a housing 10, and further includes a presser foot mechanism 30 mounted on the housing 10, wherein the presser foot mechanism 30 is used for pressing conveyed cloth.

As shown in the schematic structural view of the presser foot mechanism 30 in fig. 8, the presser foot mechanism 30 is installed in the housing 10, and the presser foot mechanism 30 is used for pressing the conveyed cloth, so that the cloth is in a moderately tensioned state, and the quality of the machine head sewing process is improved. The presser foot mechanism 30 includes a presser foot shaft 31, a presser foot arm 32, a presser foot support 33, and a presser foot plate 34, the presser foot shaft 31 is mounted on the housing 10 so as to be rotatable with respect to the housing 10, one end of the presser foot shaft 31 is connected to the presser foot arm 32, the presser foot support 33 is provided on the other end of the presser foot arm 32 with respect to the presser foot shaft 31, and the presser foot plate 34 is provided on the presser foot support 33 so as to be rotatable with respect to the presser foot support 33. The presser foot shaft 31 is used for driving the presser foot arm 32 to rotate, so as to adjust the installation angle of the whole presser foot mechanism 30; the presser foot arm 32 is used for supporting the presser foot bracket 33; the presser foot support 33 is for supporting the presser foot plate 34. The presser foot shaft 31 rotates, and the presser foot plate 34 rotates relative to the presser foot bracket 33, so that the presser foot plate 34 is adjusted in two axes.

Since the pressure between the presser foot 34 and the cloth is kept unchanged during sewing, when the sewn fabric is thickened from thin or a stem seam appears, the pressure of the presser foot increases to cause the sewn fabric to pass through unsmoothly, and a clamping phenomenon is caused, in order to improve the phenomenon, the invention provides a presser foot pressure adjusting mechanism 70 for changing the pressure between the presser foot 34 and the needle plate 13, as shown in fig. 3 and 4, which is a schematic structural diagram of the presser foot pressure adjusting mechanism 70, the presser foot pressure adjusting mechanism 70 comprises:

The force application member 73 is provided with a force application member,

A driving mechanism 74 for driving the force application member 73 to move in the pressing direction of the presser foot 34 to the needle plate 13;

a manual adjustment member 76 movably connected to the urging member 73;

A locking member 77 for maintaining the relative position between the manual adjustment member 76 and the urging member 73;

a resilient force guide 78 acting between the manual adjustment 76 and the footpad 34.

In this embodiment, the presser foot pressure adjusting mechanism 70 for changing the pressure between the presser foot 34 and the needle plate 13 is applied to an overedger, in which the needle plate 13 is horizontally disposed and the height remains unchanged, and the pressing direction has at least a component perpendicular to the direction of the needle plate 13.

The amount of pressure between the presser foot 34 and the needle plate 13 is affected by the elastic force guide 78, and the elastic force guide 78 transmits the pressure to the presser foot 34 in a compressed or stretched state. The compression state of the elastic force guide 78 is adjusted by the manual adjustment member 76. When the manual adjustment member 76 is depressed, the resilient force-guiding member 78 is compressed, and the pressure between the footpad 34 and the needle plate 13 increases; when the manual adjustment 76 is adjusted upward, the resilient force-guiding member 78 is stretched and the pressure between the footpad 34 and the needle plate 13 is reduced.

The manual adjustment 76 is depressed or up-regulated in both automatic and manual modes. Wherein the manual mode is primarily by an operator manually controlling the relative position of the manual adjustment 76. The automatic mode controls the relative position of the manual adjustment member 76 by adding a force application member 73 driven by a drive mechanism 74.

In the automatic mode, the force application member 73 and the manual adjustment member 76 are integrated, and when the driving mechanism 74 drives the force application member 73 to move, the driving mechanism drives the manual adjustment member 76 to change the height position, so as to compress or stretch the elastic force guide member 78 connected with the manual adjustment member 76 to change the pressure between the footplate 34 and the needle plate 13.

In the manual mode, the height position of the urging member 73 is kept unchanged, and the relative position of the manual adjustment member 76 with respect to the urging member 73 is changed in the pressing direction of the presser foot board 34 against the needle plate 13. The force applying member 73 is movable relative to the manual adjustment member 76 to compress or stretch a resilient force guide member 78 coupled to the manual adjustment member 76 to vary the pressure between the footpad 34 and the needle plate 13.

Further, after the position of the manual adjusting member 76 is changed relative to the urging member 73, the manual adjusting member 76 is locked by the locking member 77 to maintain the relative position of the manual adjusting member 76 and the urging member 73, so as to maintain the pressure between the presser plate 34 and the needle plate 13 unchanged.

Before sewing, the overedger manually adjusts and controls the pressure between the presser foot 34 and the needle plate 13 through a manual mode to generate pretightening force; when the overedger is used for sewing fabrics, the thickness of the fabrics is increased, or the seams are formed, or the thickness of the fabrics is reduced, the pressure of the presser foot 34 and the needle plate 13 is adjusted in real time through an automatic mode, so that the presser foot 34 is matched with fabrics with different thicknesses in real time, the overedger can smoothly sew when the fabrics are excessively thick, and the phenomena of uneven stitch and fabric wrinkles are improved.

To achieve real-time matching of the presser foot 34 to different thickness fabrics, in one embodiment, the presser foot pressure adjustment mechanism 70 further comprises a hall sensing device 742 fixedly mounted with respect to the needle plate 13 for sensing the thickness of the fabric on the needle plate 13, and the hall sensing device 742 is in communication with the driving mechanism 74 for transmitting sensing data.

It will be appreciated that, in order to realize an automatic mode of adjusting the pressure of the presser foot 34 and the needle plate 13 in real time, the presser foot pressure adjusting mechanism 70 is additionally provided with a hall detector 742 for detecting the thickness of the cloth on the needle plate 13 in real time, and sending detection data including the thickness of the cloth to the control circuit board, and then the control circuit board sends an electrical signal to the driving mechanism 74, so as to drive the force applying member 73 to move to adjust the pressure of the presser foot 34 and the needle plate 13 in real time.

In one embodiment, the driving mechanism 74 is a stepper motor 741, the stepper motor 741 and the force applying member 73 are linked by a transmission mechanism 75, and the transmission mechanism 75 includes:

a worm 751 connected to an output shaft 7411 of the stepper motor 741,

The actuator arm 752 swings about a fixed axis, one end of the actuator arm 752 has a gear 7521 engaged with the worm 751, and the other end of the actuator arm 752 is connected to the urging member 73.

It will be appreciated that the output shaft 7411 of the stepping motor 741 is provided with a worm 751, and the stepping motor 741 drives the worm 751 to rotate about the axis by the rotation of the output shaft 7411, the worm 751 is engaged with the gear 7521 at one end of the transmission arm 752, and the other end of the transmission arm 752 is connected to the urging member 73.

The rotating worm 751 drives the engagement end of the actuator arm 752 up or down. The transmission arm 752 is fixed to the housing 10 by a fixed pin 753, and the transmission arm 752 swings around a fixed axis where the fixed pin 753 is located, wherein the fixed pin 753 is equivalent to a pivot, and has a fixed axis. When the rotating worm 751 drives the engagement end of the actuator arm 752 to rise, the other end of the actuator arm 752 is lowered, and the force application member 73 is driven to fall; when the rotating worm 751 drives the engaging end of the transmission arm 752 to descend, the other end of the transmission arm 752 ascends, and the urging member 73 is thereby driven to ascend.

In one embodiment, actuator arm 752 is shown in FIG. 7 in a schematic configuration. The other end of the transmission arm 752 is provided with a bar-shaped hole 7522, and the force application member 73 is rotatably connected with the transmission arm 752 through a pin shaft 754 penetrating through the bar-shaped hole 7522.

It will be appreciated that, to achieve that the other end of the actuator arm 752 is linked with the force application member 73, the other end of the actuator arm 752 is connected to the force application member 73 through the pin 754, and when the actuator arm 752 swings around the fixed axis, the movement track of the other end of the actuator arm 752 is circular, the movement track of the force application member 73 is linear, and the pin 754 is relatively displaced in the bar hole 7522 by opening the bar hole 7522 at the other end of the actuator arm 752, so as to keep the force application member 73 to move in the linear direction all the time. More specifically, the other end of the transmission arm 752 is provided with a receiving groove 7523 for connecting the urging member 73 for facilitating connection of the urging member 73.

In one embodiment, the force application member 73 is an internal threaded sleeve, and the manual adjustment member 76 is threaded through the internal threaded sleeve and is in threaded engagement with the internal threaded sleeve.

It will be appreciated that the manual adjustment member 76 is threaded into an internally threaded sleeve, and that the manual adjustment member 76 is externally threaded at the periphery. Before sewing, the internal thread sleeve is fixedly installed relative to the shell 10, and the manual adjusting piece 76 and the internal thread sleeve rotate by rotating the manual adjusting piece 76 so as to adjust the pressure of the presser foot plate 34 on the needle plate 13. In the sewing process of the overedger, the internal thread sleeve is in threaded fit and fixed with the manual adjusting piece 76 relatively, and the internal thread sleeve is driven by the driving mechanism 74 to drive the manual adjusting piece 76 to change the relative position.

In one embodiment, a connection handle 731 is fixed on the outer wall of the internal thread sleeve, and the pin 754 is inserted through the connection handle 731. By adding the connecting handle 731, the internal thread sleeve is convenient to be connected with the other end of the transmission arm 752, and the pin shaft 754 penetrates through the connecting handle 731 and is arranged in the strip-shaped hole 7522 at the other end of the transmission arm 752.

Specifically, the other end of the transmission arm 752 is provided with a containing groove 7523 for containing the connecting handle 731, so that better connection and linkage between the transmission arm 752 and the internal thread sleeve are realized.

In one embodiment, the locking member 77 is a lock nut that is mounted on the manual adjustment member 76 and abuts an axial end face of the internally threaded sleeve.

It will be appreciated that the lock nut mates with the external threads of the manual adjustment 76. Before the pressure of the footplate 34 is manually adjusted, the elastic guide is compressed or stretched by unscrewing the lock nut and the manual adjustment member 76, and by rotating the manual adjustment member 76 to adjust the pressure of the footplate 34.

Specifically, the manual adjustment member 76 is rod-shaped to facilitate engagement with the lock nut.

In one embodiment, the outer circumference of the manual adjustment member 76 has a limit step 761, one end of the elastic force guide member 78 abuts against the footpad 34, and the other end of the elastic force guide member 78 is sleeved on the manual adjustment member 76 and abuts against the limit step 761. The limit step 761 is arranged on the periphery of the manual adjusting piece 76, so that the elastic force guide piece 78 is conveniently positioned, and the force applied to the elastic force guide piece 78 by the manual adjusting piece 76 is facilitated.

In one embodiment, the resilient force-guiding member 78 is a coil spring. One end of the spiral spring is propped against the presser foot plate 34, and the other end of the spiral spring is sleeved on the manual adjusting piece 76 and propped against the limit step 761. In other embodiments, the resilient force-guiding member 78 may be a deformable resilient member such as rubber, air springs, or other types of springs.

In one embodiment, the presser foot pressure adjusting mechanism 70 further includes a pressing bar sleeve 79 obliquely arranged with respect to the needle plate 13 to guide the pressing direction, the internal thread sleeve and the elastic force guide 78 are disposed in the pressing bar sleeve 79, the top of the manual adjusting member 76 extends out of the pressing bar sleeve 79, and the lock nut is mounted at a portion of the manual adjusting member 76 extending out of the pressing bar sleeve 79. The press bar sleeve 79 protects the female screw sleeve and the elastic force guide 78, and ensures the pressing direction.

Correspondingly, the casing 10 is provided with a pressing rod hole for accommodating the pressing rod sleeve 79, and the pressing rod sleeve 79 penetrates through the pressing rod hole to be fixedly arranged on the casing, for example, the pressing rod sleeve 79 can be fixed in a glue bonding mode. The axial direction of the presser bar sleeve 79 is inclined at a certain angle to the needle plate 13.

Specifically, the compression bar sleeve 79 includes an upper compression bar sleeve 791 and an intermediate sleeve 792, the upper compression bar sleeve 791 is sleeved on the outer periphery of the internal thread sleeve, the outer periphery of the upper compression bar sleeve 791 is provided with a first opening 7911 for the connection handle 731 to penetrate from the inside of the upper compression bar sleeve 791 to the outside, and the first opening 7911 has a width for the connection handle 731 to move in the axial direction of the upper compression bar sleeve 791.

In one embodiment, a connecting piece 71 for transmitting the pressure of the elastic force guide 78 to the footplate 34 is disposed between the elastic force guide 78 and the footplate 34, the connecting piece 71 has a positioning step towards the end of the elastic force guide 78, and the elastic force guide 78 is sleeved on the periphery of the connecting piece 71 and abuts against the positioning step. Specifically, a push-down rod sleeve 793 is provided on the outer periphery of the connection member 71 to facilitate positioning of the connection member 71.

In one embodiment, the presser foot pressure adjustment mechanism 70 further includes a presser foot lifting lever 72 that controls movement of the presser foot 34, such that the presser foot 34 is moved away from the needle plate 13 by application of force to the presser foot lifting lever 72, facilitating removal of cloth from the needle plate 13 from under the presser foot 34.

Specifically, a stress protrusion 711 is provided on the outer periphery of the connecting member 71, and the presser foot lifting lever 72 abuts against the stress protrusion 711. The presser foot lifting lever 72 swings about a fixed fulcrum, and the presser foot lifting lever 72, under a biasing force, acts with the force-receiving projection 711 to lift the presser foot plate 34. The end of the presser foot lifting rod 72 far away from the stress protrusion 711 is provided with a handle, the handle is pressed, the end of the presser foot lifting rod 72 close to the stress protrusion 711 is tilted upwards, the stress protrusion 711 is driven to move upwards, and then the presser foot board 34 connected with the connecting piece 71 is driven to ascend. The presser foot lifting bar 72 and the force-bearing protrusion 711 may be hinged or abutted against each other.

Correspondingly, a second opening 7931 for the force-bearing protrusion 711 to penetrate is formed in the pressing rod sleeve 793 sleeved on the outer periphery of the connecting piece 71, and the second opening 7931 has a width for the force-bearing protrusion 711 to move in the axial direction of the pressing rod sleeve 793.

In one embodiment, a thickness detection module (not shown) may be further disposed on the overedger 100 to detect the thickness of the fabric in real time, and the electronic control unit 6211 may adjust the presser foot 34 to a corresponding inclination and height according to the thickness detected by the thickness detection module.

In one embodiment, the thickness detection module may detect the thickness of the fabric by using a hall element, infrared detection, or the like.

The pressure adjusting mechanism 70 of the presser foot provided by the invention is characterized in that the relative position of the manual adjusting piece 76 is manually controlled before the overedger is sewn so as to adjust the pressure between the presser foot 34 and the needle plate 13, and the height position of the manual adjusting piece 76 is automatically controlled in real time according to the thickness of sewn fabric in the sewing process of the overedger so as to adjust the pressure between the presser foot 34 and the needle plate 13. The overedger using the presser foot pressure adjusting mechanism 70 can be matched with fabrics with different thicknesses, so that the overedger can smoothly sew when the fabrics are too thick and pass the peduncles, and the phenomena of uneven stitch and fabric wrinkling are improved.

Referring to fig. 9, fig. 9 is a flow chart illustrating a presser foot pressure adjusting method based on an overedger according to an embodiment of the invention.

The presser foot pressure adjusting method based on the overedger is applied to the overedger, and is used for changing the pressure between the presser foot and the needle plate, and comprises the following steps:

the initial pressure is preset, and specifically, the pressure of the initial presser foot cloth is set by an operator.

The height of the manual adjustment member 76 is manually adjusted until the pressure between the presser foot and the needle plate meets a preset, specifically, the force application member maintains the height position unchanged, changing the position of the manual adjustment member in its axial direction. The force application member and the manual adjustment member can move relatively, so that the elastic force guide member connected with the manual adjustment member is compressed or stretched to change the pressure between the presser foot board and the needle board, and the locking member is used for locking to keep the relative positions of the manual adjustment member and the force application member.

The cloth is fed, in particular, the presser foot board is far away from the needle board, so that the cloth is conveniently placed between the presser foot and the needle board, and then the presser foot presses the cloth on the needle board, preferably, the thickness of the cloth can be detected and the pressure of the presser foot can be regulated when the presser foot presses the cloth on the needle board.

Starting a motor to start feeding cloth, detecting the thickness of the cloth in real time in the feeding process, and specifically, detecting the thickness of the cloth in real time by a thickness detection module

Calculating working pressure according to the cloth thickness, automatically adjusting the pressure of a presser foot through a presser foot pressure adjusting mechanism, specifically, calculating the optimal pressure between the presser foot and a needle plate by using the thickness of the cloth detected by a thickness detecting module, controlling a driving mechanism and driving a force application member to move axially along the presser foot, adjusting the pressure of the presser foot to press the cloth by the working pressure, specifically, driving the meshing end of a driving arm to ascend or descend by a rotating worm, swinging the driving arm around a fixed axis where a fixed pin shaft is located, and driving the other end of the driving arm to descend when the rotating worm drives the meshing end of the driving arm to ascend, so as to drive the force application member to descend; when the meshing end of the transmission arm is driven to descend by the rotating worm, the other end of the transmission arm ascends to drive the force application part to ascend, so that the elastic force guide part connected with the manual adjusting part is controlled to compress or stretch to change the pressure born by the presser foot.

According to the invention, the adjusting mechanism is arranged to change the extension or compression distance of the elastic force guide piece, so that the pressure between the presser foot and the needle plate is adjusted.

Specifically, the overedger further comprises a thickness detection module, wherein the thickness detection module can detect the thickness of the cloth, and the adjusting mechanism adjusts the height of the overedger according to the detected thickness of the cloth, so that the adjusting process is realized in real time and automatically.

In this embodiment, thickness detection module includes hall element and magnetic part, thickness detection module detects the thickness of cloth through hall principle indirection, detects the thickness of cloth through hall effect, has great advantage not only in the cost, still has higher interference killing feature, can adapt to complicated production environment.

Of course, in other embodiments, the thickness detection module may also implement direct measurement or indirect measurement of the thickness of the cloth by means of an ultrasonic distance sensor, an infrared distance sensor, an optical distance sensor, a pressure sensor, and the like.

In the first embodiment, the thickness detection module detects the thickness and thickness change of cloth, the electric control system controls the stepping motor to rotate to drive the worm to swing the transmission arm, the force application part is shifted to slide up and down, the force application part slides up and down to change the compression amount of the elastic force guide part, the pressure on the presser foot is changed, and when the stem seam and the thick material fabric are sewn, the pressure of the presser foot is controlled by the stepping motor, so that the fabric can smoothly pass through, and the condition that the dense stitch feeding is unsmooth is avoided. The automatic detection, the automatic control and the automatic adjustment are realized by combining the thickness detection and the adjustment mechanism.

(1) When the sewing machine is used for sewing thinner cloth, the thickness detection module detects that the thickness of the cloth is thinner, signals are transmitted to the electric control system, and the electric control system regulates and controls the stepping motor to enable the compression amount of the elastic force guide piece to be in a thinner material compression area, so that a thinner material trace is smoother;

(2) When the sewing machine is used for sewing medium-thickness cloth, the thickness detection module detects that the thickness of the cloth is medium-thickness cloth, and the electric control system regulates and controls the stepping motor to enable the compression amount of the elastic force guide piece to be in a medium-thickness cloth compression area, so that the sewing of medium-thickness cloth stitches is more attractive;

(3) When the sewing machine is used for sewing thicker cloth, the thickness detection module is used for detecting that the thickness of the cloth is thicker, and the electric control system regulates and controls the stepping motor to ensure that the compression amount of the elastic force guide piece is in a thicker cloth compression area, so that the thicker cloth can be sewn more smoothly, and the stitch is more uniform;

(4) When the sewing machine is used for sewing cloth and converting the cloth into thick material from thin material, the thickness detection module transmits a thick material signal, the electric control system recognizes the signal change, the stepping motor is regulated, the compression amount of the elastic force guide piece is reduced, the pressure reduction counteracts the extra pressure generated by lifting the presser foot, the cloth smoothly passes through the presser foot, and the sewing stitch attractiveness is improved.

When the sewing machine is used for sewing cloth and converting the cloth into thin materials from thick materials, the thickness detection module transmits a thin and thick signal, the electric control system recognizes the signal change, the stepping motor is regulated, the compression amount of the elastic force guide piece is increased, the elastic force guide piece pressure reduced by the reduction of the pressing foot is counteracted, and the cloth sewing stitch is kept optimal.

The automatic detection, the automatic control and the automatic adjustment are realized by combining the thickness detection and the adjustment mechanism. The thickness detection module can rapidly detect the thickness and thickness change of cloth, the electric control system recognizes the signal change, the stepping motor is controlled by the electric control system to rotate to drive the worm to swing the transmission arm, the force application part is shifted to slide up and down, the compression amount of the elastic force guide part is changed by sliding the force application part up and down, and the pressure on the presser foot is changed. When the stem seams and the thick fabric are sewn, the pressure of the presser foot can be controlled by the stepping motor, so that the fabric can smoothly pass through, the conditions of dense stitch, unsmooth cloth feeding and cloth wrinkling are avoided, and the stitch attractiveness is improved.

In the second embodiment, the linear Hall thickness detection module is used for detecting the thickness and thickness change of cloth and outputting voltage signals of different thicknesses of the cloth, the electric control system is used for identifying the voltage signals, the stepping motor is controlled to rotate to drive the worm to swing the transmission arm, the force application part is shifted to slide up and down to enable the compression amount of the elastic force guide part to change, the pressure of the presser foot is changed, and when the stem seam and the thick material fabric are sewn, the pressure of the presser foot is controlled by the stepping motor, so that the fabric can smoothly pass through, and the condition that the dense cloth feeding of the stitch is not smooth is avoided. The thickness detection module is combined with the adjusting mechanism to realize automatic detection, automatic control and automatic real-time adjustment.

The electric control system performs initial and end voltage value identification on the linear Hall thickness detection module, matches the identified voltage value range with the rotation range of the stepping motor through test, calculates a coefficient k between the stepping motor and the Hall voltage value, wherein the k value comprises a transmission ratio z1/z2 between a worm and a transmission tooth and a length ratio l1/l2 between two ends of the transmission tooth, and calculates the rotation angle of the stepping motor according to the formula omega=kV.

When the sewing machine is used for sewing cloth with certain thickness, the thickness detection module outputs a voltage value, and the electric control system calculates the rotation angle of the stepping motor through the voltage value so as to adjust the pressure of the elastic force guide piece, so that the sewing machine can analyze and process different thickness characteristics of the cloth in real time, and the sewing stitch reaches the optimal state.

The invention realizes automatic detection, automatic control and automatic real-time adjustment by combining the thickness detection and the adjustment mechanism. The thickness detection module can rapidly detect the thickness and thickness change of cloth, the electric control system recognizes the signal change, rapidly and accurately controls the stepping motor to rotate and toggle the force application piece to slide up and down, and changes the position of the force application piece, so that the pressure of the adjusting mechanism always maintains the optimal sewing mode. The fabric can smoothly pass through, the conditions of dense stitch, unsmooth cloth feeding and cloth wrinkling are avoided, and the stitch attractiveness is improved.

In the third embodiment, the stepping motor is controlled by the electric control system to rotate to drive the worm to swing the transmission arm, the force application piece is shifted to slide up and down, the compression amount of the elastic force guide piece is changed by sliding the force application piece up and down, the pressure on the presser foot is changed, and when a stem seam and thick fabric are sewn, the pressure of the presser foot can be controlled by the stepping motor, so that the fabric can smoothly pass through, and the condition that the dense stitch feeding is unsmooth is avoided. The automatic detection, the automatic control and the automatic adjustment are realized by combining the thickness detection and the adjustment mechanism.

(1) When the sewing machine is used for sewing thinner cloth, an operator can set a thin material mode, and the electric control system controls the stepping motor to set the pressure of the thin material adjusting mechanism, so that the stepping motor is suitable for thin material sewing, and the thin material stitch is smoother;

(2) When the sewing machine is used for sewing medium-thickness cloth, an operator can set a medium-thickness cloth mode, and the electric control system regulates and controls the stepping motor to enable the compression amount of the regulating mechanism to be in a medium-thickness compression area, so that the sewing of medium-thickness cloth stitches is more attractive;

(3) When the sewing machine is used for sewing thicker cloth, an operator can set a thick cloth mode, and the electric control system regulates and controls the stepping motor to enable the compression amount of the compression rod to be in a thicker cloth compression area, so that the thicker cloth can be sewn more smoothly, and the stitch is more uniform;

According to the invention, manual three-gear adjustment is realized by controlling the operation panel, and the electric control system controls the stepping motor to automatically adjust the compression amount of the adjusting mechanism. The operator can set up by three grades of thin material, medium thick material and thick material rapidly, accurately controls the stepping motor to rotate and toggle the force application piece to slide up and down, and changes the pressure on the elastic force guide piece. When the fabric with different thickness is sewn, the presser foot pressure can be set through one key, so that the fabric can smoothly pass through, the conditions of dense stitch, unsmooth cloth feeding and cloth wrinkling are avoided, and the stitch attractiveness is improved.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (7)

1. The presser foot pressure adjusting method based on the overedger is characterized by comprising the following steps of:

presetting an initial pressure;

Manually adjusting the manual adjusting piece until the pressure between the presser foot and the needle plate accords with the preset value;

feeding cloth;

Detecting the thickness of cloth in real time in the cloth feeding process;

working pressure is calculated according to the cloth thickness, and the presser foot pressure is automatically adjusted through a presser foot pressure adjusting mechanism;

The presser foot pressure adjusting mechanism includes: the force application piece is used for automatically adjusting the pressure of the presser foot; a driving mechanism for driving the force application member to move along the axial direction; the manual adjusting piece is movably connected with the force application piece and used for manually adjusting the height of the presser foot, and the locking piece is used for keeping the relative position between the manual adjusting piece and the force application piece; an elastic force guide member acting between the manual adjustment member and the presser foot;

When the driving mechanism drives the force application part to move, the height position of the manual adjustment part is driven to change, so that the elastic force guide part connected with the manual adjustment part is compressed or stretched to change the pressure between the foot pressing plate and the needle plate;

The driving mechanism is a stepping motor, the stepping motor is linked with the force application piece through a transmission mechanism, and the transmission mechanism comprises: the worm is connected with the output shaft of the stepping motor; the transmission arm swings around a fixed axis, one end of the transmission arm is provided with transmission teeth meshed with the worm, and the other end of the transmission arm is connected with the force application piece;

The force application part is an internal thread sleeve, and the manual adjusting part is arranged in the internal thread sleeve in a penetrating manner and is in threaded fit with the internal thread sleeve; the locking piece is a locking nut which is arranged on the manual adjusting piece and abuts against the axial end face of the internal thread sleeve; the locking nut is matched with the external thread of the manual adjusting piece;

In the sewing process of the overedger, the internal thread sleeve is in threaded fit and fixed with the manual adjusting piece relatively, and the internal thread sleeve is driven by the driving mechanism to drive the manual adjusting piece to change the relative position.

2. The method according to claim 1, wherein the presser foot pressure adjusting mechanism further comprises a presser bar sleeve which is obliquely arranged with the needle plate to guide the pressing direction, the internal thread sleeve and the elastic force guide member are arranged in the presser bar sleeve, the top of the manual adjusting member extends out of the presser bar sleeve, and the lock nut is arranged at the position of the manual adjusting member extending out of the presser bar sleeve.

3. The method for adjusting the pressure of the presser foot based on the overedger according to claim 1, characterized in that the outer wall of the internal thread bush is fixed with a connecting handle on which the pin shaft is inserted.

4. The method for adjusting the pressure of the presser foot based on the overedger according to claim 3, characterized in that the periphery of the manual adjusting member is provided with a limiting step, the elastic force guiding member is a spiral spring, one end of the spiral spring is abutted against the presser foot, and the other end of the spiral spring is sleeved on the manual adjusting member and abutted against the limiting step.

5. The hemming machine-based presser foot pressure adjustment method of claim 1 wherein the hemming machine further includes a thickness detection module for detecting the thickness of the cloth.

6. The method for adjusting the pressure of a presser foot based on an overedger according to claim 5, characterized in that the thickness detection module comprises a hall element and a magnetic member, the hall element and the magnetic member are mutually adapted, and the thickness detection module detects the thickness of the cloth by the hall principle.

7. The hemming machine-based presser foot pressure adjustment method of claim 6 wherein the thickness detection module includes at least one of an ultrasonic distance sensor, an infrared distance sensor, an optical distance sensor, a pressure sensor.