Multi-needle machine for sewing chair cover

Abstract

The utility model relates to the technical field of multi-needle machines, in particular to a multi-needle machine for sewing a chair cover, which aims at solving the technical problems that in the prior art, a machine needle is easy to deviate and break, and feeding is not synchronous, and is mainly realized through the following technical scheme. Comprising a working frame and a sewing structure with a sewing machine head, the sewing structure is provided with a multi-needle thread stand, the sewing machine further comprises a needle seat structure and a traction structure, the needle seat structure comprises a sewing needle, a fixed needle seat, a protection piece and a connecting piece, the protection piece comprises a protection seat, a thread guide seat and a connecting rod, and the connecting piece comprises a connecting seat, an anti-falling clamp and an anti-falling seat. The traction structure comprises an upper unfolding piece and a lower tensioning piece, the fixed needle base and the protection piece are arranged to prevent the sewing needle from being stressed and broken during operation, guide protection can be conducted, sewing displacement is reduced, the traction structure is arranged to adjust the stretching state according to the fabric elasticity condition, the surface pressing force during sewing is improved, and it is ensured that the overall contraction amount is regular after sewing.

Description

Technical Field

[0001] The utility model relates to the technical field of multi-needle machines, in particular to a multi-needle machine for sewing chair covers. Background Art

[0002] There are many types of multi-needle machines, which are widely used in decorative sewing. The number of needles of multi-needle machines ranges from sparse to dense, and there are many choices of needle numbers. Multi-needle machines can achieve functions such as pleating, pleating, and elastic puckering after adding auxiliary devices. It is suitable for pleating, edging and other decorative sewing of most clothing fabrics, and is also suitable for sewing chair covers with bed skirts. It can sew chair covers with pleated bed skirts quickly and well.

[0003] In the prior art, multi-needle machines require frequent replacement of needles to ensure sewing diversity. When replacing the needles, the multi-needle seat is cumbersome to disassemble and inconvenient to replace, and the lack of protection for the needles makes them easily broken by force, resulting in increased replacement costs. The needles are directly raised and lowered to sew with the fabric, and there is a lack of guide protection for the needles, which can easily cause sewing displacement or thread distortion, affecting the sewing effect. In addition, elastic strips such as elastic bands need to be wrapped in the fabric during sewing. However, during the stretching and feeding process, uneven feeding can easily occur, resulting in irregular shrinkage or unqualified quality. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defects of the prior art that the needles are easily offset and broken and the feeding is not synchronized, so as to provide a multi-needle machine for sewing chair covers.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions:

[0006] A multi-needle machine for sewing chair covers, comprising a work frame and a sewing structure, wherein the sewing structure is arranged along the length direction of the work frame and fixed on the work frame, a sewing machine head is downwardly extended on one side of the sewing structure in the length direction, and a multi-needle thread frame is fixed on the side of the sewing structure away from the sewing machine head, and further comprising:

[0007] A needle seat structure, wherein the needle seat structure is movably connected to the bottom of the sewing machine head, the needle seat structure comprises a plurality of sewing needles, a fixed needle seat, a protective member and a connecting member, wherein the connecting member is fixed to the bottom of the sewing machine head and connects the fixed needle seat with the sewing machine head, wherein a plurality of sewing needles are arranged in an array along the length direction of the fixed needle seat and are clamped under the fixed needle seat, wherein a threading hole is provided under the sewing needle, and the protective member is movably connected to the fixed needle seat and is sleeved on the outside of the sewing needle;

[0008] A traction structure, wherein the traction structure is arranged along the width direction of the working frame and is arranged on a side of the working frame close to the sewing machine head, the traction structure includes an upper unfolding member and a lower tensioning member, the upper unfolding member includes a front unfolding wheel and a rear stretching wheel arranged along the feeding direction, the front unfolding wheel and the rear stretching wheel are arranged relatively to each other in the width direction of the working frame, and the lower tensioning member includes two tensioning wheels arranged relatively to each other in the width direction of the working frame.

[0009] By adopting the above technical solution, a fixed needle seat and a protective member are provided to protect the sewing needle, thereby preventing the sewing needle from being broken due to force during operation. The protective member can also guide and protect the sewing needle during operation, thereby reducing the occurrence of sewing displacement and ensuring the sewing effect. The upper expansion member and the lower tensioning member are provided so that their corresponding positions can be adjusted according to the elasticity of the fabric, thereby ensuring that the whole is in a stretched state and increasing the surface pressing force to ensure that the overall shrinkage after sewing is regular.

[0010] Furthermore, a snap-in groove is provided at the bottom of the fixed needle seat corresponding to the sewing needle, and the protective member includes a protective seat, a wire seat and a connecting rod. The connecting rod passes through the fixed needle seat and is fixed to the protective seat below the fixed needle seat. The connecting rod is arranged to slide vertically relative to the fixed needle seat. A movable spring is also sleeved on the connecting rod, one end of the movable spring abuts against the bottom of the fixed needle seat, and the other end abuts against the top of the protective seat. The wire seat is arranged along the length direction of the fixed needle seat and is snap-connected to the fixed needle seat.

[0011] By adopting the above technical solution, the protective seat moves up and down with the sewing needle, protecting the sewing needle that rises and falls during sewing, and can be reset by the movable spring without affecting the sewing process. When pressed down, the protective seat rises to squeeze the movable spring to expose the sewing needle for sewing, and when raised, the movable spring reset sleeve is arranged on the outside of the sewing needle to guide the sewing needle to prevent it from being broken by force.

[0012] Furthermore, a movable hole is provided on the protective seat corresponding to the sewing needle, the movable hole is arranged along the height direction of the protective seat and the diameter decreases successively from top to bottom, and the bottom diameter of the movable hole is larger than the diameter of the sewing needle; a cloth pressing piece is also extended on the protective seat, and the cloth pressing piece is arranged on the side close to the rear stretching wheel; a vertical wire hole is provided on the wire seat, and a through wire groove is extended on one side of the wire hole, and the width of the wire groove is smaller than the diameter of the wire hole.

[0013] By adopting the above technical solution, the minimum diameter of the movable hole is also larger than the diameter of the sewing needle, which reduces the contact between the inner wall of the protective seat and the sewing needle. When pressed down, the cloth pressing piece is driven to press the fabric tightly, which is convenient for pressing and sewing; the wire hole guides the thread passed through the sewing needle to avoid threading disorder affecting the sewing effect.

[0014] Furthermore, a connecting column extends vertically from the center of the top of the fixed needle seat, a reinforcement seat extends from the bottom of the connecting column at the connection with the fixed needle seat, a clamping ring extends toward the periphery near the middle of the connecting column, the connecting column is clamped with the connecting piece, the connecting piece includes a connecting seat, an anti-fall card and an anti-fall seat, the connecting seat is fixed under the sewing machine head, the top of the connecting column is threadedly connected to the top of the connecting seat, the anti-fall seat is relatively arranged on both sides of the connecting seat and along the length direction of the fixed needle seat, the anti-fall card is slidably arranged in the anti-fall seat and the sliding direction is perpendicular to the length direction of the anti-fall seat.

[0015] By adopting the above technical solution, the connecting column is first inserted into the connecting seat, and the anti-fall card is abutted against the bottom of the clamping ring. Then, the connecting column is rotated to screw the connecting column and the connecting seat to adjust the specific position of the fixed needle seat. The connecting column and the connecting seat are plug-in and supported by the anti-fall card under the clamping ring to prevent the fixed needle seat from falling off the sewing machine head, thereby ensuring the safety of the needle when sewing.

[0016] Furthermore, a toggle card is extended upward from the top of the anti-fall card, and a toggle groove for the toggle card to slide is opened on the anti-fall seat along the width direction; a movable column is extended from the anti-fall card to the side away from the connecting column, and a movable groove is opened in the anti-fall seat corresponding to the movable column, and a telescopic spring is also sleeved on the movable column, one end of the telescopic spring abuts against the anti-fall card, and the other end abuts against the outer side of the movable groove; a connecting hole is also penetrated and provided above the middle of the connecting column, and the axis of the connecting hole is parallel to the length direction of the fixed needle seat, and strip adjustment grooves are opened on opposite sides of the connecting seat along the height direction.

[0017] By adopting the above technical solution, when disassembling and installing, the user can press and push the toggle card, and then rotate the connecting column to disengage from the connecting seat, so that the overall operation is convenient and easy to adjust. After determining the specific position of the fixed needle seat, the fixing bolt is passed through the adjustment slot and the connecting hole to limit the circumferential rotation of the connecting column to avoid displacement during use.

[0018] Furthermore, the multi-needle thread rack is tilted and fixed on the sewing structure, the distance between the top of the multi-needle thread rack and the sewing machine head is smaller than the distance between the bottom of the multi-needle thread rack and the sewing machine head, the multi-needle thread rack includes a thread rack seat and multiple thread pay-off racks, the thread pay-off racks are staggered on the thread rack seat, a lead piece is also arranged between the multi-needle thread rack and the sewing machine head, the lead piece includes a lead rack and a thread breaking rack, a plurality of parallel lead grooves are provided on the lead rack, the lead grooves are arranged along the length direction of the sewing structure, the thread breaking rack is arranged on one side of the lead rack, a thread breaking sensor and a thread clamping block are provided on the thread breaking rack, and the thread clamping block is vertically slidably arranged in the thread breaking rack.

[0019] By adopting the above technical solution, the staggered arrangement of the pay-off racks is convenient for leading out each wire end without overlapping after leading out, and is also convenient for timely observation after wire breakage. When the wire is broken, it can be sensed in time by the wire break sensor and clamped by the wire clamping block to avoid the wire breaking and falling off, resulting in the need to find the wire end and rethread it later, saving time and improving work efficiency.

[0020] Furthermore, the upper unfolding member also includes an unfolding frame and a stretching frame, the front unfolding wheel is positioned and rotatably installed on the top of the unfolding frame, the rear stretching wheel is positioned and rotatably installed on the top of the stretching frame, the unfolding frame and the stretching frame are both telescopic structures and the bottoms are hinged to the side walls of the working frame, and tightening bolts are also provided at the hinges at the bottoms of the unfolding frame and the stretching frame; the lower tensioning member also includes two inclined telescopic frames, the top of the telescopic frame is fixed to the side wall of the working frame and the bottom has a gap with the side wall of the working frame, and the two tensioning wheels are respectively positioned and rotatably installed at the bottoms of different telescopic frames.

[0021] By adopting the above technical solution, the upper unfolding member is adjusted according to the circumference of the seat cover to be sewed as required, ensuring that the seat cover can be in an unfolded state and be sewed on the upper unfolding member and the lower tensioning member, ensuring a smooth sewing process.

[0022] Furthermore, a flattening piece is provided on the side of the front unfolding wheel close to the sewing machine head, and a flattening frame is extended from the flattening piece and connected to the sewing machine head. The flattening piece includes a flattening wheel, a toggle wheel, a linkage shaft, a linkage belt and a linkage gear set. The linkage shaft is arranged perpendicular to the side of the sewing structure and is positioned and rotatably installed on the side of the sewing structure. The axis of the linkage shaft is arranged along the feeding direction, the axis of the toggle wheel is parallel to the axis of the linkage shaft and is connected through a linkage belt. The linkage gear set includes a driving gear coaxially arranged with the toggle wheel and a driven gear coaxially arranged with the flattening wheel. The driving gear is meshed with the driven gear, and the axes of the driving gear and the driven gear are perpendicular and both are bevel gears.

[0023] By adopting the above technical solution, the toggle wheel is toggled along the folding direction, and the leveling wheel is leveled and transported along the feeding direction, ensuring that both the folding surface and the feeding surface are pressed, ensuring that the feeding contact surface is sufficient and improving the feeding stability.

[0024] In summary, the technical solution of the utility model has the following advantages:

[0025] 1. The multi-needle machine for sewing chair covers provided by the utility model is provided with a fixed needle seat and a protective piece to protect the sewing needle, thereby preventing the sewing needle from being broken by force during operation. The protective piece can also guide and protect the sewing needle during operation, thereby reducing the occurrence of sewing displacement and ensuring the sewing effect.

[0026] 2. The multi-needle machine for sewing chair covers provided by the utility model is provided with an upper unfolding part and a lower tensioning part, and their corresponding positions can be adjusted according to the elasticity of the fabric, ensuring that the whole is in a stretched state, and increasing the surface pressing force to ensure that the overall shrinkage after sewing is regular.

[0027] 3. The multi-needle machine for sewing chair covers provided by the utility model is provided with a flattening piece during sewing to ensure that multiple layers of overlapping fabrics can be spread out flatly, avoiding the occurrence of sewing misalignment, and can provide assistance for material transportation to ensure synchronous transportation during sewing. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of the overall structure of a multi-needle machine for sewing chair covers provided in one embodiment of the utility model;

[0030] Figure 2 A partial cross-sectional view of a needle seat structure provided in one embodiment of the utility model;

[0031] Figure 3 A partial cross-sectional view of a connecting member provided in one embodiment of the utility model;

[0032] Figure 4 A schematic diagram of a partial structure of a flattening member provided in one embodiment of the utility model;

[0033] Figure 5 It is a schematic diagram of the local structure of a traction structure provided in one embodiment of the utility model.

[0034] Description of reference numerals:

[0035] 1. Work stand; 2. Sewing structure; 21. Sewing machine head; 3. Multi-needle thread stand; 31. Thread stand seat; 32. Pay-off stand; 33. Lead-in piece; 331. Lead-in frame; 3311. Lead-in groove; 332. Thread-breaking frame; 3321. Thread-breaking sensor; 3322. Thread clamping block; 4. Needle seat structure; 41. Sewing needle; 42. Fixed needle seat; 421. Snap-in groove; 422. Connecting column; 4221. Reinforcement seat; 4222. Snap-in ring; 4223. Connecting hole; 43. Protective piece; 431. Protective seat; 4311. Movable hole; 4312. Cloth pressing piece; 432. Wire seat; 4321. Wire hole; 4322. Wire groove; 433. Connecting rod; 4331. Movable Spring; 44, connecting piece; 441, connecting seat; 4411, adjusting slot; 442, anti-fall card; 4421, toggle card; 4422, movable column; 443, anti-fall seat; 4431, toggle slot; 4432, movable slot; 4433, telescopic spring; 5, traction structure; 51, upper unfolding piece; 511, front unfolding wheel; 512, rear stretching wheel; 513, unfolding frame; 514, stretching frame; 515, tightening bolt; 52, lower tensioning piece; 521, tensioning wheel; 522, telescopic frame; 6, flattening piece; 61, leveling wheel; 62, toggle wheel; 63, linkage shaft; 64, linkage belt; 65, linkage gear set; 651, driving gear; 652, driven gear. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] A multi-needle machine for sewing chair covers, such as Figure 1 and Figure 5As shown, it includes a working frame 1 and a sewing structure 2, the sewing structure 2 is arranged along the length direction of the working frame 1 and fixed on the working frame 1, a sewing head 21 is extended downward on one side of the length direction of the sewing structure 2, a multi-needle thread frame 3 is fixed on the side of the sewing structure 2 away from the sewing head 21, and also includes a needle seat structure 4 and a traction structure 5, the needle seat structure 4 is movably connected below the sewing head 21, and the needle seat structure 4 includes a plurality of sewing needles 41, a fixed needle seat 42, a protective member 43 and a connecting member 44. The connecting member 44 is fixed to the bottom of the sewing head 21 and connects the fixed needle seat 42 with the sewing head 21, a plurality of sewing needles 41 are arranged in an array along the length direction of the fixed needle seat 42 and are clamped below the fixed needle seat 42, a threading hole is opened below the sewing needle 41, and the protective member 43 is movably connected to the fixed needle seat 42 and is sleeved on the outside of the sewing needle 41. The traction structure 5 is arranged along the width direction of the working frame 1 and is arranged on one side of the working frame 1 close to the sewing machine head 21. The traction structure 5 includes an upper unfolding member 51 and a lower tensioning member 52. The upper unfolding member 51 includes a front unfolding wheel 511 and a rear stretching wheel 512 arranged along the feeding direction. The front unfolding wheel 511 and the rear stretching wheel 512 are relatively arranged with respect to the width direction of the working frame 1. The lower tensioning member 52 includes two tensioning wheels 521 relatively arranged with respect to the width direction of the working frame 1.

[0038] The fixed needle seat 42 and the protective member 43 are provided to protect the sewing needle 41, so as to avoid the sewing needle 41 being broken by force during operation. The protective member 43 can also guide and protect the sewing needle 41 during operation, reduce the occurrence of sewing displacement, and ensure the sewing effect. The upper expansion member 51 and the lower tensioning member 52 are provided to adjust their corresponding positions according to the elasticity of the fabric, ensure that the whole is in a stretched state, and increase the surface pressing force to ensure that the overall shrinkage after sewing is regular.

[0039] like Figure 1 and Figure 2 As shown, a snap-in groove 421 is provided at the bottom of the fixed needle seat 42 corresponding to the sewing needle 41, and the protective member 43 includes a protective seat 431, a wire seat 432 and a connecting rod 433. The connecting rod 433 passes through the fixed needle seat 42 and is fixed to the protective seat 431 below the fixed needle seat 42. The connecting rod 433 is vertically slidably arranged relative to the fixed needle seat 42. A movable spring 4331 is also sleeved on the connecting rod 433. One end of the movable spring 4331 abuts against the bottom of the fixed needle seat 42, and the other end abuts against the top of the protective seat 431. The wire seat 432 is arranged along the length direction of the fixed needle seat 42 and is snap-fitted to the fixed needle seat 42. The protective seat 431 moves up and down with the sewing needle 41. The sewing needle 41 that rises and falls during sewing is protected and can be reset by the movable spring 4331 without affecting the sewing process. When pressed down, the protective seat 431 rises to squeeze the movable spring 4331 to expose the sewing needle 41 for sewing. When raised, the movable spring 4331 resets and sleeves on the outside of the sewing needle 41 to guide and protect the sewing needle 41 to avoid being broken by force.

[0040] like Figure 1 and Figure 2 As shown, a movable hole 4311 is provided on the protective seat 431 corresponding to the sewing needle 41. The movable hole 4311 is arranged along the height direction of the protective seat 431 and its diameter decreases from top to bottom. The bottom diameter of the movable hole 4311 is larger than the diameter of the sewing needle 41. The minimum diameter of the movable hole 4311 is also larger than the diameter of the sewing needle 41, so as to reduce the contact between the inner wall of the protective seat 431 and the sewing needle 41.

[0041] A cloth pressing piece 4312 is also extended on the protection seat 431, and the cloth pressing piece 4312 is arranged on a side close to the rear stretching wheel 512. When the protection seat 431 is pressed down, the cloth pressing piece 4312 is driven to press the fabric, which is convenient for pressing and sewing.

[0042] A vertical wire hole 4321 is provided on the wire seat 432, and a through wire groove 4322 is extended on one side of the wire hole 4321, and the width of the wire groove 4322 is smaller than the diameter of the wire hole 4321. The wire hole 4321 guides the wire threaded on the sewing needle 41 to avoid threading disorder affecting the sewing effect.

[0043] like Figure 1 and Figure 2 As shown, a connecting column 422 extends vertically from the center of the top of the fixed needle seat 42, a reinforcement seat 4221 extends from the bottom of the connecting column 422 and the connection with the fixed needle seat 42, a snap ring 4222 extends toward the periphery near the middle of the connecting column 422, and the connecting column 422 is snap-connected with the connecting piece 44.

[0044] like Figure 2 and Figure 3 As shown, the connector 44 includes a connecting seat 441, an anti-drop card 442 and an anti-drop seat 443. The connecting seat 441 is fixed below the sewing machine head 21. The top of the connecting column 422 is threadedly connected to the top of the connecting seat 441. The anti-drop seat 443 is relatively arranged on both sides of the connecting seat 441 and arranged along the length direction of the fixed needle seat 42. The anti-drop card 442 is slidably arranged in the anti-drop seat 443 and the sliding direction is perpendicular to the length direction of the anti-drop seat 443. First, the connecting column 422 is inserted into the connecting seat 441, and the anti-drop card 442 abuts against the bottom of the clamping ring 4222. Then, the connecting column 422 is rotated to screw the connecting column 422 and the connecting seat 441 to adjust the specific position of the fixed needle seat 42. The connecting column 422 is plugged into the connecting seat 441 and supported below the clamping ring 4222 through the anti-drop card 442 to prevent the fixed needle seat 42 from falling off from the sewing machine head 21, thereby ensuring the safety of the needle when sewing.

[0045] A toggle card 4421 extends upward from the top of the anti-fall card 442, and a toggle slot 4431 for the toggle card 4421 to slide is provided on the anti-fall seat 443 along the width direction. A movable column 4422 extends from the side of the anti-fall card 442 away from the connecting column 422, and a movable slot 4432 is provided in the anti-fall seat 443 for corresponding movement. A telescopic spring 4433 is also sleeved on the movable column 4422, and one end of the telescopic spring 4433 abuts against the anti-fall card 442, and the other end abuts against the outer side of the movable slot 4432. When disassembling and installing, the toggle card 4421 can be pressed and opened, and then the connecting column 422 is rotated to disengage from the connecting seat 441, so that the disassembly can be carried out, and the overall operation is convenient and easy to adjust.

[0046] A connecting hole 4223 is also provided in the middle of the connecting column 422, and the axis of the connecting hole 4223 is parallel to the length direction of the fixed needle seat 42. The connecting seat 441 is provided with strip-shaped adjustment grooves 4411 on opposite sides along the height direction. After the specific position of the fixed needle seat 42 is determined, a fixing bolt is passed through the adjustment groove 4411 and the connecting hole 4223 to limit the circumferential rotation of the connecting column 422 to avoid displacement during use.

[0047] like Figure 1 and Figure 4 As shown, the multi-needle thread stand 3 is tilted and fixed on the sewing structure 2, and the distance between the top of the multi-needle thread stand 3 and the sewing machine head 21 is smaller than the distance between the bottom of the multi-needle thread stand 3 and the sewing machine head 21. The multi-needle thread stand 3 includes a thread stand seat 31 and a plurality of pay-off stands 32, and the pay-off stands 32 are staggered on the thread stand seat 31. A lead-in component 33 is also provided between the multi-needle thread stand 3 and the sewing machine head 21, and the lead-in component 33 includes a lead-in frame 331 and a thread-breaking frame 332. A plurality of parallel lead-in grooves 3311 are provided on the lead-in frame 331, and the lead-in grooves 3311 are provided along the length direction of the sewing structure 2. The thread-breaking frame 332 is provided on one side of the lead-in frame 331, and a thread-breaking sensor 3321 and a thread-clamping block 3322 are provided on the thread-breaking frame 332, and the thread-clamping block 3322 is vertically slidably provided in the thread-breaking frame 332. The staggered arrangement of the pay-off rack 32 facilitates the lead-out of each thread end without overlapping after the thread ends are led out, and is also convenient for timely observation after the thread breaks. When the thread breaks, it can be sensed in time by the thread break sensor 3321 and the thread can be clamped by the thread clamping block 3322 to prevent the thread from falling off, resulting in the need to find the thread end and rethread it later, saving time and improving work efficiency.

[0048] like Figure 5 As shown, the upper unfolding member 51 also includes an unfolding frame 513 and a stretching frame 514. The front unfolding wheel 511 is positioned and rotatably installed on the top of the unfolding frame 513, and the rear stretching wheel 512 is positioned and rotatably installed on the top of the stretching frame 514. Both the unfolding frame 513 and the stretching frame 514 are telescopic structures and their bottoms are hinged to the side wall of the working frame 1. Tightening bolts 515 are also provided at the hinged bottom of the unfolding frame 513 and the stretching frame 514.

[0049] The lower tensioning member 52 also includes two tilted telescopic frames 522, the top of which is fixed to the side wall of the working frame 1 and the bottom of which is spaced apart from the side wall of the working frame 1, and two tensioning wheels 521 are respectively positioned and rotatably mounted at the bottom of different telescopic frames 522. The upper unfolding member 51 is adjusted according to the circumference of the chair cover to be sewed, ensuring that the chair cover can be in an unfolded state and sewed on the upper unfolding member 51 and the lower tensioning member 52, ensuring a smooth sewing process.

[0050] like Figure 4 and Figure 5 As shown, a flattening piece 6 is provided on one side of the front unfolding wheel 511 near the sewing machine head 21, and a flattening frame is extended from the flattening piece 6 and connected to the sewing machine head 21. The flattening piece 6 includes a flattening wheel 61, a toggle wheel 62, a linkage shaft 63, a linkage belt 64 and a linkage gear set 65. The linkage shaft 63 is arranged perpendicular to the side of the sewing structure 2 and is positioned and rotatably installed on the side of the sewing structure 2. The axis of the linkage shaft 63 is arranged along the feeding direction. The axis of the toggle wheel 62 is parallel to the axis of the linkage shaft 63 and is connected through the linkage belt 64. The linkage gear set 65 includes a driving gear 651 coaxially arranged with the toggle wheel 62 and a driven gear 652 coaxially arranged with the flattening wheel 61. The driving gear 651 is meshed with the driven gear 652, and the axes of the driving gear 651 and the driven gear 652 are perpendicular and both are bevel gears. The toggle wheel 62 is toggled along the folding direction, and the leveling wheel 61 is leveled and transported along the feeding direction, ensuring that both the folding surface and the feeding surface are pressed, ensuring that the feeding contact surface is sufficient and improving the feeding stability.

[0051] The working principle and use method of the multi-needle machine for sewing chair covers are as follows: the chair cover to be sewn is rolled and placed on the traction structure 5, the positions of the upper unfolding member 51 and the lower tensioning member 52 are adjusted, the unfolding frame 513 and the stretching frame 514 are adjusted to the length and the opening angle, and after confirmation, they are tightened and fixed by tightening the bolts 515 to ensure that the chair cover is stretched and tensioned as a whole; then the corresponding needle seat structure 4 is selected, the connecting column 422 is inserted into the connecting seat 441, and the connecting column 422 is tightened to adjust the distance between the fixed needle seat 42 and the sewing surface, and the fixed needle seat 42 is determined. The height of the needle seat 42 is determined by a fixing bolt passing through the connecting hole 4223 and the adjusting slot 4411 to fix the position of the needle seat 42 to prevent it from shifting and rotating during sewing; then the thread head is introduced from the multi-needle thread rack 3 through the sewing needle 41, and the lead-in thread passes through the thread clamping block 3322 to ensure that the thread breakage can be discovered and handled in time, and then the sewing structure 2 is started for sewing; during sewing, the flattening part 6 can be started as needed. When started, the flattening wheel 61 cooperates with the transportation along the feeding direction, and the toggle wheel 62 is folded and flattened along the folding direction to ensure the overall flattening.

[0052] The above description shows and describes the preferred embodiments of the utility model. As mentioned above, it should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A multi-needle machine for sewing chair covers, comprising a working frame (1) and a sewing structure (2), wherein the sewing structure (2) is arranged along the length direction of the working frame (1) and is fixed on the working frame (1), a sewing machine head (21) is extended downwardly from one side of the sewing structure (2) in the length direction, and a multi-needle thread frame (3) is fixed to the side of the sewing structure (2) away from the sewing machine head (21), characterized in that: Also includes: A needle seat structure (4), wherein the needle seat structure (4) is movably connected to the bottom of a sewing machine head (21), the needle seat structure (4) comprises a plurality of sewing needles (41), a fixed needle seat (42), a protective member (43) and a connecting member (44), wherein the connecting member (44) is fixed to the bottom of the sewing machine head (21) and connects the fixed needle seat (42) and the sewing machine head (21), wherein a plurality of sewing needles (41) are arranged in an array along the length direction of the fixed needle seat (42) and are clamped to the bottom of the fixed needle seat (42), wherein a threading hole is provided below the sewing needle (41), and the protective member (43) is movably connected to the fixed needle seat (42) and is sleeved on the outside of the sewing needle (41); A traction structure (5), the traction structure (5) is arranged along the width direction of the working frame (1) and is arranged on a side of the working frame (1) close to the sewing machine head (21), the traction structure (5) comprises an upper unfolding member (51) and a lower tensioning member (52), the upper unfolding member (51) comprises a front unfolding wheel (511) and a rear stretching wheel (512) arranged along the feeding direction, the front unfolding wheel (511) and the rear stretching wheel (512) are arranged relative to each other in the width direction of the working frame (1), and the lower tensioning member (52) comprises two tensioning wheels (521) arranged relative to each other in the width direction of the working frame (1).

2. A multi-needle machine for sewing chair covers according to claim 1, characterized in that: The bottom of the fixed needle seat (42) is provided with a snap-in groove (421) corresponding to the sewing needle (41); the protective member (43) comprises a protective seat (431), a wire seat (432) and a connecting rod (433); the connecting rod (433) passes through the fixed needle seat (42) and is fixed to the protective seat (431) below the fixed needle seat (42); the connecting rod (433) is arranged to slide vertically relative to the fixed needle seat (42); a movable spring (4331) is also sleeved on the connecting rod (433); one end of the movable spring (4331) abuts against the bottom of the fixed needle seat (42), and the other end abuts against the top of the protective seat (431); the wire seat (432) is arranged along the length direction of the fixed needle seat (42) and is snap-connected to the fixed needle seat (42).

3. A multi-needle machine for sewing chair covers according to claim 2, characterized in that: The protective seat (431) is provided with a movable hole (4311) corresponding to the sewing needle (41), the movable hole (4311) is arranged along the height direction of the protective seat (431) and the diameter decreases from top to bottom, and the bottom diameter of the movable hole (4311) is larger than the diameter of the sewing needle (41); the protective seat (431) is also provided with a cloth pressing piece (4312) extending therefrom, and the cloth pressing piece (4312) is arranged on a side close to the rear stretching wheel (512); the wire seat (432) is provided with a vertical wire hole (4321), and a through wire groove (4322) extending therefrom is provided on one side of the wire hole (4321), and the width of the wire groove (4322) is smaller than the diameter of the wire hole (4321).

4. The multi-needle machine for sewing chair covers according to claim 2, characterized in that: A connecting column (422) is vertically extended from the center of the top of the fixed needle seat (42); a reinforcing seat (4221) is extended from the bottom of the connecting column (422) where it is connected to the fixed needle seat (42); a clamping ring (4222) is extended from the middle of the connecting column (422) toward the periphery; the connecting column (422) is clamped with a connecting piece (44); the connecting piece (44) comprises a connecting seat (441), an anti-falling clamp (442) and an anti-falling seat (443); the connecting seat (441) is fixed below the sewing machine head (21); the top of the connecting column (422) is threadedly connected to the top of the connecting seat (441); the anti-falling seat (443) is relatively arranged on both sides of the connecting seat (441) and arranged along the length direction of the fixed needle seat (42); the anti-falling clamp (442) is slidably arranged in the anti-falling seat (443) and the sliding direction is perpendicular to the length direction of the anti-falling seat (443).

5. The multi-needle machine for sewing chair covers according to claim 4, characterized in that: A toggle card (4421) extends upward from the top of the anti-falling card (442); a toggle groove (4431) for sliding the toggle card (4421) is provided on the anti-falling seat (443) along the width direction; a movable column (4422) extends from the side of the anti-falling card (442) away from the connecting column (422); a movable groove (4432) is provided in the anti-falling seat (443) corresponding to the movable column (4422); A telescopic spring (4433) is also sleeved, one end of the telescopic spring (4433) is in contact with the anti-falling card (442), and the other end is in contact with the outer side of the movable groove (4432); a connecting hole (4223) is also provided through the upper middle part of the connecting column (422), the axis of the connecting hole (4223) is parallel to the length direction of the fixed needle seat (42), and strip adjustment grooves (4411) are provided on opposite sides of the connecting seat (441) along the height direction.

6. The multi-needle machine for sewing chair covers according to claim 1, characterized in that: The multi-needle thread frame (3) is tilted and fixed on the sewing structure (2); the distance between the top of the multi-needle thread frame (3) and the sewing machine head (21) is smaller than the distance between the bottom of the multi-needle thread frame (3) and the sewing machine head (21); the multi-needle thread frame (3) comprises a thread frame seat (31) and a plurality of thread pay-off frames (32); the thread pay-off frames (32) are staggeredly arranged on the thread frame seat (31); a thread guide (33) is further arranged between the multi-needle thread frame (3) and the sewing machine head (21); the thread guide (33) ) comprises a lead frame (331) and a wire breaking frame (332), the lead frame (331) being provided with a plurality of parallel lead grooves (3311), the lead grooves (3311) being arranged along the length direction of the sewing structure (2), the wire breaking frame (332) being arranged on one side of the lead frame (331), the wire breaking frame (332) being provided with a wire breaking sensor (3321) and a wire clamping block (3322), the wire clamping block (3322) being arranged in a vertical sliding manner in the wire breaking frame (332).

7. The multi-needle machine for sewing chair covers according to claim 1, characterized in that: The upper unfolding member (51) further comprises an unfolding frame (513) and a stretching frame (514); the front unfolding wheel (511) is mounted on the top of the unfolding frame (513) for positioning and rotation; the rear stretching wheel (512) is mounted on the top of the stretching frame (514) for positioning and rotation; the bottoms of the unfolding frame (513) and the stretching frame (514) are both hingedly connected to the side wall of the working frame (1); the unfolding frame (513) and the stretching frame (514) are both telescopic structures and a tightening bolt (515) is further arranged at the bottom hinge; the lower tensioning member (52) further comprises two obliquely arranged telescopic frames (522); the top of the telescopic frame (522) is fixed to the side wall of the working frame (1) and the bottom is spaced apart from the side wall of the working frame (1); the two tensioning wheels (521) are respectively mounted on the bottoms of different telescopic frames (522) for positioning and rotation.

8. The multi-needle machine for sewing chair covers according to claim 7, characterized in that: A flattening member (6) is arranged on one side of the front unfolding wheel (511) close to the sewing machine head (21); a flattening frame is extended from the flattening member (6) and connected to the sewing machine head (21); the flattening member (6) comprises a flattening wheel (61), a toggle wheel (62), a linkage shaft (63), a linkage belt (64) and a linkage gear set (65); the linkage shaft (63) is arranged perpendicular to the side of the sewing structure (2) and is fixedly rotatably mounted on the side of the sewing structure (2); the linkage shaft (63) is arranged perpendicularly ...) and is fixedly rotatably mounted on the side of the sewing structure (2) and The driving wheel (62) is arranged along the feeding direction, the axis of the driving wheel (62) is parallel to the axis of the linkage shaft (63) and is connected through a linkage belt (64), the linkage gear set (65) comprises a driving gear (651) coaxially arranged with the driving wheel (62) and a driven gear (652) coaxially arranged with the leveling wheel (61), the driving gear (651) and the driven gear (652) are meshed, the axes of the driving gear (651) and the driven gear (652) are perpendicular and both are bevel gears.

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