Sewing machine cloth folding and cutting device and method and cutting mechanism

Abstract

The present invention belongs to the field of sewing technology, and specifically relates to a sewing machine cloth folding cutting device and method and a cutting mechanism. The cutting device includes a cutting assembly, and the cutting assembly further includes a first cutter and a second cutter that are relatively movable to cut the cloth, and a cutter seat, at least one of the first cutter and the second cutter is movably arranged on the cutter seat, and the first cutter or the second cutter moves along the cutter seat so that the two cooperate to cut the cloth. The cutting device of the present invention can be matched with a sewing machine, so as to automatically cut the edge of the folded part of the cloth during folding sewing. After the cutting assembly is adjusted and fixed, the relative lateral distance D between the cut edge and the sewing needle is fixed, and the edge after folding sewing is neat and beautiful.

Description

Technical Field

[0001] The invention belongs to the technical field of sewing, and in particular relates to a cutting device, method and cutting mechanism which can be applied to the folding of cloth of a sewing machine. Background Art

[0002] In the field of sewing, hem sewing is a common sewing method, which is used on the hem, collar, cuffs of clothing, as well as the edges of other fabrics such as curtains and bed sheets. Hem sewing can prevent the edge of the fabric from unraveling, and it is also more beautiful.

[0003] However, in the prior art, due to errors in the folding operation techniques or tools, or the edges of the fabric themselves are not neat, the finished product after folding sewing cannot achieve a very ideal sewing effect in terms of folding width, edge neatness, etc.

[0004] To solve the above problems, we have conducted in-depth research and developed the cutting device, method and cutting mechanism of the present invention, which can overcome the above shortcomings and ensure that the relative position of the edge of the cut cloth relative to the sewing needle is fixed, thereby making the folded edge of the sewn finished product neat and beautiful. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the folded edges are not neat and beautiful in hem sewing, and to provide a cutting device, method and cutting mechanism which can automatically cut the edges of the folded edges during the sewing process.

[0006] To achieve the above object, the scheme adopted by the present invention is:

[0007] A cloth folding and cutting device for a sewing machine comprises a cutting assembly, wherein the cutting assembly comprises a first cutter and a second cutter, and the first cutter and the second cutter move relative to each other to cut the cloth.

[0008] The cutting assembly also includes a cutter seat, on which at least one of the first cutter and the second cutter is movably arranged, and the first cutter or the second cutter moves along the cutter seat so that the two cooperate to cut the cloth.

[0009] Preferably, the cutting device also includes a driving member, which has a first shaft and a second shaft, the first shaft and the second shaft are not arranged colinearly, and the first shaft is used to connect with the output shaft or the lower looper of the sewing machine; the second cutter is provided with a driving groove, and the second shaft fits in the driving groove.

[0010] The cutter seat is also provided with a guide rail, and the second cutter is provided with a guide groove, and the guide groove cooperates with the guide rail to enable the second cutter to be arranged to move back and forth along the cutter seat.

[0011] Preferably, a cutter fixing seat is provided on the cutter seat, a sliding cavity is formed in the cutter fixing seat, the first cutter is fixed on a sliding shaft, the sliding shaft fits in the sliding cavity of the fixing seat, and an elastic member is provided between the sliding shaft and the sliding cavity.

[0012] Preferably, the cutting device further comprises a housing, which is fixed to the sewing machine; the housing comprises a front cover, and the cutting assembly is arranged on the front cover; the cutting assembly is preferably arranged on the front cover in a translationally movable manner. That is, the cutting device can be a split structure to be assembled on a sewing machine with an existing structure, or the structure of the existing sewing machine can be improved and the housing can be integrated thereon, which are both implementation methods of fixed connection.

[0013] The material cutting device also includes a material suction mechanism, which includes a material suction port and a material suction pipeline. The material suction port is matched with the first cutting knife, and the material suction pipeline is connected to the material suction port.

[0014] Preferably, the incision formed by the cooperation between the first cutter and the second cutter is arranged along the extension direction of the output shaft of the sewing machine;

[0015] The cutting device further comprises a folding adjustment mechanism, which comprises a first adjustment member and a second adjustment member, and at least one of the first adjustment member and the second adjustment member is movably arranged.

[0016] Preferably, the second cutter comprises a second cutter body, a slider and a cutter head, the guide groove is arranged on the slider, the slider is fixedly connected to the second cutter body, a cutter head fixing seat is formed on the second cutter body, and the cutter head is matched at the cutter head fixing seat.

[0017] Preferably, the cutting device also includes an upper panel, which is fixed on the shell; a pinhole is also provided on the upper panel for the sewing needle to fit therein; the lateral distance D between the cutting line formed by the cooperation of the first cutter and the second cutter and a certain pinhole is adjusted by adjusting the position of the cutting assembly on the front cover; the longitudinal distance H between the cutting station formed by the cooperation of the first cutter and the second cutter and a certain pinhole is adjusted by adjusting the size of the shell or the relative position relationship between the front cover and the shell.

[0018] A method for cutting and folding cloth for a sewing machine, comprising the following steps:

[0019] The cutting assembly is configured so that the first cutting knife and the second cutting knife are relatively movable to cut the cloth;

[0020] Setting the lateral position of the cut formed by the first cutter and the second cutter to be adapted to the sewing position;

[0021] A driving member is provided to be connected between the output shaft of the sewing machine and the first cutter or the second cutter, so that the rotation of the output shaft drives the second cutter to reciprocate relative to the first cutter to cut the cloth.

[0022] Preferably, the first cutter is fixedly arranged on the cutter seat, and the second cutter is arranged to be movable back and forth along the cutter seat through the cooperation of the guide groove and the guide rail; in addition, the cutting process can be placed before the sewing process.

[0023] Preferably, the first cutter is engaged with the cutter seat via a mechanism comprising an elastic element.

[0024] As a preference, the method further includes a material suction step.

[0025] A sewing machine folding and cutting mechanism comprises a first cutter and a second cutter, wherein the first cutter and the second cutter move relative to each other to cut the cloth. The cutting assembly also comprises a cutter seat, wherein at least one of the first cutter and the second cutter is movably arranged on the cutter seat, and the cloth is cut by the relative movement of the two.

[0026] Preferably, the method may further include a driving member, the driving member having a first shaft and a second shaft, the first shaft and the second shaft are arranged non-collinearly, the second cutter is provided with a driving groove, and the second shaft fits in the driving groove.

[0027] The cutter seat may preferably be provided with a cutter fixing seat, a sliding cavity is formed in the cutter fixing seat, the first cutter is fixed on a sliding shaft, the sliding shaft fits in the sliding cavity of the fixing seat, and an elastic member is provided between the sliding shaft and the sliding cavity.

[0028] It may also preferably include a suction mechanism, which includes a suction port and a suction pipeline. The suction port is arranged near the first cutter, and the suction pipeline is connected to the suction port and can generate negative pressure.

[0029] In some other embodiments, a folding adjustment mechanism may also be included, which includes a first adjusting member, a second adjusting member and a folding groove; the first adjusting member and the second adjusting member can be slidably arranged, so that the width of the folding groove can be adjusted by adjusting the relative position between the first adjusting member and the second adjusting member, thereby supporting different folding widths.

[0030] The cutting device of the present invention can be used in conjunction with a sewing machine to automatically cut the edge of the folded portion of the fabric during folding sewing. After the cutting assembly is adjusted and fixed, the relative lateral distance D between the cut edge and the sewing needle can be fixed, thereby avoiding folding operation errors and uneven fabric edges that result in uneven and unsightly folded portions of folded sewing. In addition, the actual cutting position also supports position adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of hem sewing in the prior art;

[0032] Figure 2 It is a sewing diagram after cutting the edge of the fabric during hemming sewing; the dotted line is the edge that is cut off;

[0033] Figure 3 is a schematic diagram of the structure of a sewing machine cloth folding and cutting device according to a certain embodiment of the present invention, and more specifically, a schematic diagram of the structure of the sewing machine cloth folding and cutting device when it is used in a cylinder-type sewing machine;

[0034] Figure 4 yes Figure 3 A schematic diagram of the cooperation between the cutting mechanism and the sewing machine of the embodiment;

[0035] Figure 5 is a schematic structural diagram of a cutting device according to another embodiment of the present invention;

[0036] Figure 6 yes Figure 5 A schematic diagram of the structural decomposition of an embodiment;

[0037] Figure 7 yes Figure 5 A schematic diagram of the structure of the cutting assembly in the embodiment;

[0038] Figure 8 yes Figure 5 A schematic diagram of the structure of the second cutter in the embodiment;

[0039] Fig. 9 yes Figure 5 A schematic diagram of the cooperation between the first cutter and the cutter seat in the embodiment;

[0040] Fig.10 yes Fig. 9 Schematic diagram of structural decomposition;

[0041] Fig.11 is a structural schematic diagram of another embodiment of the present invention having a folding adjustment mechanism;

[0042] Fig.12 yes Fig.11 A schematic diagram of the structural decomposition of the hem adjustment mechanism in the embodiment;

[0043] Fig.13 yes Figure 3 An exploded schematic diagram of the embodiment and the main body of a sewing machine;

[0044] Fig.14 yes Figure 3 A schematic diagram of the structure coordination between the embodiment and the main part of the sewing machine;

[0045] Fig.15 It is a schematic diagram of the horizontal and vertical relationship between the cutting component and the sewing position in a certain embodiment of the present invention;

[0046] Fig.16 It is a structural schematic diagram of another embodiment of the present invention having a material suction mechanism. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the present invention, and thus to more clearly define the scope of the present invention, the present invention is described in detail with respect to some specific embodiments of the present invention. It should be noted that the following are only some specific implementation methods of the present invention, which are only part of the embodiments of the present invention, wherein the specific and direct description of the relevant structure is only for the convenience of understanding the present invention, and each specific feature does not naturally and directly limit the scope of implementation of the present invention. The conventional selection and replacement made by those skilled in the art under the guidance of the present invention should be regarded as within the scope of the present invention.

[0048] A cutting device for hemming fabric of a sewing machine is used to cut the edge of the fabric when the sewing machine is sewing the hem of the fabric. It is preferred to cut the fabric before sewing. Hemming sewing is generally used for the hem, cuffs, collar and other parts of clothing. The main process of hemming sewing is as follows: Figure 1 As shown, after a part of the fabric is folded, sewing is performed near the edge of the folded portion to form a folded edge. Single needle or multiple needles can be used for sewing. When multiple needles are used, the innermost needle is generally located at the inner side of the edge and only sews a single layer, and the remaining needles are located at the double layer after the folded edge. Figure 1 The schematic diagram of double needle sewing is shown, wherein the hemming sewing line is the working position of the two sewing needles. Obviously, due to the error in the hemming operation and the fact that the edge of the fabric itself may not be strictly straight, the hemming edge portion after hemming sewing may not be neat enough.

[0049] To this end, it is necessary to cut the edge of the folded part during the folding sewing so that the new edge after cutting is more neat. When the cutting device of the present invention is used to cut the cloth in advance before sewing, the working process of the folding sewing is as follows: Figure 2 As shown, no matter what the edge of the folded edge part is, the position of the cutting device of the present invention relative to the sewing needle is fixed, so that the new edge after cutting can be relatively fixed, making the folded edge part after sewing neat and beautiful.

[0050] like Figure 3 , 7As shown, the cutting device includes a cutting assembly 300, and the cutting assembly 300 includes a first cutter 320 and a second cutter 330. The first cutter 320 and the second cutter 330 can move relative to each other to cut the cloth through the reciprocating movement of the two. For example, the first cutter 320 is fixed, and the second cutter 330 is arranged to reciprocate along a straight line relative to the first cutter 320, so that the cloth can be cut by the reciprocating action of the second cutter 330; or, the first cutter 320 is fixed, and the second cutter 330 is arranged to be rotatable around its hinge axis, so that the cloth can be cut by the reciprocating rotation of the second cutter 330 within a certain angle range.

[0051] In a preferred embodiment, the cutting assembly 300 further includes a cutter seat 310, a first cutter 320 is fixedly mounted on the cutter seat 310, and a second cutter 330 is movably mounted on the cutter seat 310. The second cutter 330 moves along the cutter seat 310 so as to cooperate with the first cutter 320 to cut the cloth. The second cutter 330 can be reciprocating or rotatable. Meanwhile, the first cutter is fixedly mounted, which means that it is fixed when working, and its structure can also have a certain range of adjustment space; for example, when the second cutter 330 is reciprocatingly mounted, it can also be slidably mounted on the cutter seat 310, and can be fixed in an appropriate position by means of a buckle structure, screws, etc.; when the second cutter 330 is hingedly mounted on the cutter seat 310, the first cutter 320 is also hingedly mounted on the cutter seat 310, and can be fixed in an appropriate position by means of a buckle structure, screws, etc. so that it is relatively fixed when working.

[0052] For example, to achieve the reciprocating motion of the second cutter 330 , a guide rail 3032 may be provided on the cutter seat 310 , and a guide groove 3031 may be provided on the second cutter 330 . The guide groove 3031 cooperates with the guide rail 3032 so that the second cutter 330 is reciprocally displaced along the cutter seat 310 .

[0053] like Figure 5-6 As shown, the cutting device further includes a driving member 302, so that the cutting assembly 300 can be driven by the existing action mechanism of the sewing machine without having to specially set a driving mechanism for it, thereby simplifying the implementation structure of the present invention. For example, the driving member 302 can be directly or indirectly connected to the output shaft 101 of the sewing machine 100 (for example, connected to the output shaft 101 or the lower looper 102 disposed on the output shaft 101), so that it can be actuated together with the output shaft 101 when the sewing machine is working.

[0054] like Figure 5As shown, the driving member 302 has a first shaft 3021 and a second shaft 3022. The first shaft 3021 and the second shaft 3022 are not arranged in a colinear manner. The first shaft 3021 is used to be directly or indirectly connected to the output shaft 101 of the sewing machine, and the second shaft 3022 is used to fit in the driving groove 3023 of the second cutter 330. Therefore, when the first shaft 3021 of the driving member 302 rotates or swings with the output shaft 101 (i.e., reciprocatingly swings within a certain fan-shaped angle range), the second shaft 3022 rotates or swings accordingly, and its effect is similar to that of an eccentric mechanism. By rotating or swinging the second shaft 3022, the second cutter 330 is driven to reciprocate in a straight line or swing along its hinge axis to achieve the purpose of cutting materials. Figure 6 As shown, in the best case, in addition to being connected to the output end 101 through the first shaft 3021, the driving member 302 may also have an additional protruding structure to cooperate with the output end 101 or the lower bending needle 102 to transmit torque; and the above-mentioned first shaft 3021 and second shaft 3022 are not necessarily formed by the relevant parts of the driving member 302, but can also be screwed thereon to serve as the first shaft 3021 or the second shaft 3022; for example, for the first shaft 3021, a corresponding shaft hole can be set on the driving member 302, and the driving member 302 and the output shaft 101 are fixedly connected by a screw, and the screw then acts as the first shaft 3021.

[0055] like Fig. 9 As shown, in a preferred case, the second cutter 330 includes a second cutter body 331, a slider 332 and a cutter head 334, the guide groove 3031 is arranged on the slider 332, the slider 332 is fixedly connected to the second cutter body 331 by means of screws or the like, a cutter head fixing seat 333 is formed on the second cutter body 331, and the cutter head 334 is matched with the cutter head fixing seat 333. Therefore, the material of the slider 332 can be set to be different from that of the second cutter body 331, and it is also convenient to replace the slider 332 separately. Similarly, the cutter head 334 can also be replaced separately after use and wear. Such structural adjustment is conducive to the selection of materials for each component as needed, and is also convenient for subsequent wear and tear replacement.

[0056] like Fig.10 As shown, in some other preferred embodiments, the cutter seat 310 is further provided with a cutter fixing seat 311, a sliding cavity is formed in the cutter fixing seat 311, both ends of the sliding cavity are open, a bottom cover 312 is provided at the rear end, and the open end is empty; the first cutter 320 is fixed to the rear end of the sliding shaft 313 (for example, by screws), the sliding shaft 313 is matched in the sliding cavity of the fixing seat 311, and an elastic member (for example, a spring) is provided between the rear end of the sliding shaft 313 and the bottom cover 312. Thus, when the cutting assembly 300 is in the cutting operation, when the second cutter 330 is in any position, the first cutter 320 can have a stable resistance force relative to the second cutter 330 to form a stable cutting force to facilitate the cutting operation.

[0057] like Figure 11-12 As shown, in some other preferred embodiments, the cutting device further includes a folding adjustment mechanism 400, which includes a first adjustment member 410 and a second adjustment member 420, and a folding groove 403 for setting the folding portion is formed between the first adjustment member 410 and the second adjustment member 420. The first adjustment member 410 and the second adjustment member 420 are respectively provided with a strip-shaped fixing groove, and are fixed by screws, so as to realize the sliding setting of the two adjustment members; when necessary, the relative position between the first adjustment member 410 and the second adjustment member 420 can be adjusted to realize the adjustment of the width of the folding groove 403, so as to support different folding widths. The first adjusting member 410 is provided with an inner stop 411, which is arranged upward and extends inwardly. The second adjusting member 420 is bent upward to form an outer stop 421. When it is working, when folding, the folded part of the fabric is arranged in the folding groove 403. More specifically, the outer bending part of the fold is matched with the outer stop 421, and the inner edge is located in the inner stop 411 (it can be located near it, and a close match is not required).

[0058] like Fig.16 As shown, in some other preferred embodiments, the cutting device further includes a suction mechanism, which includes a suction port 221 and a suction pipeline 222. The suction port 221 is arranged around the first cutter 320 (for example, arranged on the housing 200 below it), and the suction pipeline 222 is connected to the suction port 221, and generates negative pressure to suck away the waste. For example, the two ends of the suction pipeline 222 are respectively connected to the suction port 221 and a waste barrel (not shown in the figure), and an air source pipe 223 is further arranged in the suction pipeline 222, and its air outlet is arranged in the direction of the waste barrel, so that the suction port 221 can generate negative pressure to suck away the waste through the flow of positive pressure gas (for example, compressed air) to the waste barrel, and finally the waste is brought into the waste barrel by the air flow; such a structure is easy to manufacture and very practical, and does not require complex structures such as a vacuum pump and a filter. In addition, in order to further improve the suction effect, it can also include a suction cover plate 224, which forms a suction opening 225 at the joint between the first cutter 320 and the second cutter 330 (such as Figure 13-14 As shown), that is, the suction effect is improved by sucking in an appropriate amount of external air.

[0059] At the same time, the cutting device also includes an upper panel 202, which is fixed to the housing 200 by means of screws or the like; a needle hole 203 is also provided on the upper panel 202 for the sewing needle to fit therein, such as Fig.15As shown, the lateral distance D between the cutting line 301 formed by the cooperation of the first cutter 320 and the second cutter 330 and a certain pinhole 203 can be adjusted by adjusting the position of the cutting component 300 on the front cover 210; the longitudinal distance H between the cutting station formed by the cooperation of the first cutter 320 and the second cutter 330 and a certain pinhole 203 can be adjusted by adjusting the size of the shell 200 or the relative position relationship of the front cover 210 to the shell 200.

[0060] In principle, the cutting device of the present invention can be used in any sewing machine, but it is best used in combination with a cylinder sewing machine. Figure 3-4 , 11-14, in other preferred embodiments, the cutting device further comprises a housing 200, and the housing 200 is fixedly connected to the sewing machine; more specifically, a fixing sleeve 201 of the housing 200 is sleeved on the fixing column 103 of the sewing machine, and the housing 200 and the fixing column 103 are fixedly connected to the sewing machine by screws (such as Fig.13 The housing 200 further includes a front cover 210, which can be connected to the housing 200 by screws, and the cutting assembly 300 is disposed on the front cover 210 (for example, fixed by screws); thus, the cutting assembly 300 is easy to maintain or replace.

[0061] The above is an embodiment of adopting a split structure, which is an embodiment of improving the existing structure of the sewing machine; on this basis, the fixing sleeve 201 of the housing 200 can also be directly integrated with the sewing machine 100 to form an integrated structure. In other words, the cutting device can be assembled on the sewing machine of the existing structure (including the existing sewing machine and the newly manufactured sewing machine with the same structure) using a separate component, or integrated into the sewing machine to form an integrated sewing machine with the cutting device.

[0062] Optimally, a plurality of strip-shaped fixing grooves are provided on the front cover 210, and the cutting assembly 300 is fixed in the strip-shaped fixing grooves by means of screws or the like; thus, the cutting assembly 300 can be arranged on the front cover 210 in a translatable manner by adjusting its position in the strip-shaped fixing grooves, and the relative position of the cutting blade and the sewing needle can be adjusted during folding and cutting, so as to adapt to different folding and sewing requirements, realize precise control of the cutting and sewing positions, and achieve more consistent and beautiful folding and sewing effects (i.e., the position of the sewing needle is relatively fixed, and the folding and cutting positions can be controlled and selected by adjusting the lateral position of the cutting assembly 300).

[0063] In a preferred embodiment combined with a cylinder-type sewing machine, the cutting edge formed by the cooperation of the first cutter 320 and the second cutter 330 (i.e., the structure for cutting materials formed by the cooperation of the two cutters) is preferably arranged along the extension direction of the output shaft 101 of the sewing machine, which is conducive to the simplification of structural components and the convenience of operation.

[0064] A method for cutting and folding cloth for a sewing machine, comprising the following steps:

[0065] The cutting assembly 300 is configured so that the first cutter 320 and the second cutter 330 are relatively movable to cut the cloth; the first cutter 320 and the second cutter 330 can cut the cloth by relatively reciprocating along a straight line or by relatively swinging along a hinge axis, and the former is relatively better.

[0066] The lateral distance between the cutting edge formed by the first cutter 320 and the second cutter 330 and the sewing needle is set to adapt to the sewing position and sewing method; firstly, the lateral distance between the two determines the edge position of the fabric after sewing, and secondly, there are many sewing methods such as three-needle five-thread sewing, and different sewing methods will also have an impact on the edge of the fabric. The relative position of the two can be set as needed, which is easy to achieve.

[0067] A driving member 302 is provided to be connected between the output shaft 101 of the sewing machine and the first cutter 320 or the second cutter 330 (directly or indirectly), so that the rotation or swing of the output shaft 101 can drive the second cutter 330 to reciprocate or swing relative to the first cutter 320 to cut the cloth.

[0068] In some preferred embodiments, the first cutter 320 can be fixedly mounted on the cutter seat 310, and the second cutter 330 can be arranged to move back and forth along the cutter seat 310 through the cooperation of the guide groove 3031 and the guide rail 3032. In addition, the cutting process can be placed before the sewing process to achieve cutting first and then sewing.

[0069] In other preferred embodiments, the first cutter 320 can be retractably arranged on the cutter seat 310, and can cooperate with the cutter seat 310 through a spring mechanism so that the two cutters have a stable resistance force in any cutting state to form a stable cutting force.

[0070] In other embodiments, a material suction process is further included, in which the waste material cut by the cutting component 300 is sucked away by a device that can generate negative pressure, so as to facilitate the continuous cutting operation.

[0071] In other embodiments, a folding edge adjustment process is further included, by adjusting the respective positions of the first adjusting member 410 and the second adjusting member 420 and the relative position therebetween, so that the length and position of the folding edge meet the requirements.

[0072] In some other embodiments, the lateral position of the cutting assembly 300 relative to the sewing needle is adjustable, so that the position of the cutting assembly 300 can be adjusted when necessary to make the cutting edge position different.

[0073] The cutting method can be applied to the hemming sewing of various types of sewing machines, and it is more advantageous to apply it to a cylinder sewing machine and arrange it along the extension direction of the output shaft 101. In addition, the method can be implemented in combination with the cutting device of the present invention, which will be described in detail.

[0074] A sewing machine folding and cutting mechanism includes a first cutter 320 and a second cutter 330. The first cutter 320 and the second cutter 330 move relative to each other to cut the cloth. The cutting assembly 330 also includes a cutter seat 310. The first cutter 320 is fixed on the cutter seat 310. The second cutter 330 is movably arranged on the cutter seat 310. The second cutter 330 moves along the cutter seat 310 so that it cooperates with the first cutter 320 to cut the cloth.

[0075] In some embodiments, a driving member 302 may be further included, the driving member 302 has a first shaft 3021 and a second shaft 3022, the first shaft 3021 and the second shaft 3022 are not arranged in a colinear manner, the first shaft 3021 is used to connect with the output shaft 101 or the lower looper 102 of the sewing machine; the second cutter 330 is provided with a driving groove 3023, and the second shaft 3022 is matched in the driving groove 3023. Further, the cutter seat 310 is provided with a guide rail 3032, and the second cutter 330 is provided with a guide groove 3031, and the guide groove 3031 cooperates with the guide rail 3032 to enable the second cutter 330 to be arranged to move back and forth along the cutter seat 310.

[0076] In some other embodiments, a cutter fixing seat 311 may be provided on the cutter seat 310, a sliding cavity is formed in the cutter fixing seat 311, the first cutter 320 is fixed on the sliding shaft 313, the sliding shaft 313 is matched in the sliding cavity of the fixing seat 311, and an elastic member is provided between the sliding shaft 313 and the sliding cavity to stabilize the cutting force of the cutting assembly.

[0077] In some other embodiments, a suction mechanism may be further included, which includes a suction port 221 and a suction pipeline 222. The suction port 221 is arranged near the first cutter 320. The suction pipeline 222 is connected to the suction port 221 and can generate negative pressure, so that the cut waste can be sucked away.

[0078] In some other embodiments, a folding adjustment mechanism 400 may also be included, which includes a first adjustment member 410, a second adjustment member 420 and a folding groove 403; the first adjustment member 410 and the second adjustment member 420 can be slidably arranged, so that the width of the folding groove 403 can be adjusted by adjusting the relative position between the first adjustment member 410 and the second adjustment member 420, thereby supporting different folding widths.

[0079] In some other embodiments, a shell 200 is further included, which is fixed to the sewing machine; the shell 200 includes a front cover 210, and a cutting assembly 300 is arranged on the front cover 210; the cutting assembly 300 is preferably movably arranged on the front cover 210, so as to adjust the relative position of the cutting line and the sewing needle by adjusting the lateral position D of the cutting assembly 300, thereby realizing the control of the folding sewing.

Claims

1. A fabric folding and cutting device for a sewing machine, comprising a cutting assembly (300), wherein the cutting assembly (300) comprises a cutting knife seat (310), a first cutting knife (320) and a second cutting knife (330), wherein the first cutting knife (320) and the second cutting knife (330) move relative to each other to cut fabric; characterized in that: It also comprises a housing (200) and a driving member (302), wherein the housing (200) is used to be fixedly connected to a sewing machine; the housing (200) comprises a front cover (210), and the cutting assembly (300) is arranged on the front cover (210); The first cutter (320) is fixed on the cutter seat (310), and the second cutter (330) moves along the cutter seat (310) relative to the first cutter (320) so that the two cooperate to cut the cloth; the cutter seat (310) is also provided with a guide rail (3032), and the second cutter (330) is provided with a guide groove (3031), and the guide groove (3031) cooperates with the guide rail (3032) so that the second cutter (330) is arranged to move back and forth along the cutter seat (310); The driving member (302) comprises a first shaft (3021) and a second shaft (3022), the first shaft (3021) and the second shaft (3022) being arranged non-collinearly, and the first shaft (3021) being used to be connected to an output shaft (101) or a lower looper (102) of a sewing machine; The second cutter (330) is provided with a driving groove (3023), and the second shaft (3022) is fitted into the driving groove (3023); when the first shaft (3021) of the driving member (302) rotates or swings along with the output shaft (101), the second shaft (3022) rotates or swings accordingly, and the rotation or swing of the second shaft (3022) drives the second cutter (330) to perform linear reciprocating motion to cut materials.

2. The fabric folding and cutting device for a sewing machine according to claim 1, characterized in that: The cutter seat (310) is provided with a cutter fixing seat (311), a sliding cavity is formed in the cutter fixing seat (311), the first cutter (320) is fixed on the sliding shaft (313), the sliding shaft (313) is matched in the sliding cavity of the fixing seat (311), and an elastic member is provided between the sliding shaft (313) and the sliding cavity.

3. The fabric folding and cutting device for a sewing machine according to claim 1, characterized in that: The cutting assembly (300) is arranged on the front cover (210) in a translationally movable manner; The sewing machine cloth folding and cutting device further comprises a material suction mechanism, the material suction mechanism comprising a material suction port (221) and a material suction pipeline (222), the material suction port (221) being matched to the first cutting knife (320), and the material suction pipeline (222) being connected to the material suction port (221).

4. The fabric folding and cutting device for a sewing machine according to claim 1, characterized in that: The incision formed by the cooperation between the first cutter (320) and the second cutter (330) is arranged along the extension direction of the output shaft (101) of the sewing machine; It also includes a folding adjustment mechanism (400), the folding adjustment mechanism (400) including a first adjustment member (410) and a second adjustment member (420), at least one of the first adjustment member (410) and the second adjustment member (420) being movably arranged.

5. A method for fabric folding and cutting for a sewing machine based on the fabric folding and cutting device for a sewing machine according to any one of claims 1 to 4, characterized in that: The following steps are involved: The cutting assembly (300) is configured such that the first cutting knife (320) and the second cutting knife (330) are relatively movable to cut the cloth; Setting the lateral position of the incision formed by the first cutter (320) and the second cutter (330) to be compatible with the sewing position; A driving member (302) is provided to be connected between an output shaft (101) of a sewing machine and a first cutter (320) or a second cutter (330), so that the rotation of the output shaft (101) drives the second cutter (330) to reciprocate relative to the first cutter (320) to cut the cloth.

6. The method for cutting and folding fabric for a sewing machine according to claim 5, characterized in that: The first cutter (320) is fixedly mounted on the cutter seat (310), and the second cutter (330) is arranged to be movable back and forth along the cutter seat (310) through the cooperation of the guide groove (3031) and the guide rail (3032); in addition, the cutting process is placed before the sewing process.

7. The method for cutting and folding fabric for a sewing machine according to claim 5, characterized in that: The first cutter (320) is fitted onto the cutter seat (310) via a mechanism comprising an elastic element.

8. The method for cutting and folding fabric for a sewing machine according to claim 5, characterized in that: It also includes the process of sucking materials.

9. A sewing machine folding and cutting mechanism, comprising a cutter seat (310), a first cutter (320) and a second cutter (330), wherein the first cutter (320) and the second cutter (330) move relative to each other to cut fabric; characterized in that: The first cutter (320) is fixedly mounted on the cutter seat (310), and the second cutter (330) moves relative to the first cutter (320) to cut the cloth; The cutter seat (310) is also provided with a guide rail (3032), and the second cutter (330) is provided with a guide groove (3031), and the guide groove (3031) cooperates with the guide rail (3032) to enable the second cutter (330) to be displaceably arranged along the cutter seat (310); It also includes a driving member (302), the driving member (302) having a first shaft (3021) and a second shaft (3022), the first shaft (3021) and the second shaft (3022) being arranged non-collinearly, and the first shaft (3021) being used to connect to an output shaft (101) or a lower looper (102) of a sewing machine; The second cutter (330) is provided with a driving groove (3023), and the second shaft (3022) is fitted in the driving groove (3023): when the first shaft (3021) of the driving member (302) rotates or swings along with the output shaft (101), the second shaft (3022) rotates or swings accordingly, and the second cutter (330) is driven to perform linear reciprocating motion to cut materials through the rotation or swing of the second shaft (3022).

10. The hemming and cutting mechanism for a sewing machine according to claim 9, characterized in that: The cutter seat (310) is also provided with a cutter fixing seat (311), a sliding cavity is formed in the cutter fixing seat (311), the first cutter (320) is fixed on the sliding shaft (313), the sliding shaft (313) is matched in the sliding cavity of the fixing seat (311), and an elastic member is provided between the sliding shaft (313) and the sliding cavity.

11. The hemming and cutting mechanism for a sewing machine according to claim 9 or 10, characterized in that: It also includes a material suction mechanism, the material suction mechanism including a material suction port (221) and a material suction pipeline (222), the material suction port (221) is arranged near the first cutting knife (320), and the material suction pipeline (222) is connected to the material suction port (221); It also includes a hem-folding adjustment mechanism (400) for supporting different hem-folding widths, wherein the hem-folding adjustment mechanism (400) includes a first adjustment member (410) and a second adjustment member (420), at least one of which is movably arranged.

Images