135results about "Loop takers" patented technology

The utility model provides a sewing machine, and belongs to the technical field of sewing equipment. The problem that an existing sewing machine is insufficient in sewing quality is solved. The sewing machine comprises a base, a needle plate with a needle falling hole, a rotating shuttle located below the needle plate, a thread shifting rod and a rotating piece capable of horizontally rotating, a guide piece located on the side portion of the rotating shuttle and capable of horizontally swinging is arranged on the base, the thread shifting rod comprises a rod body and an arc-strip-shaped thread shifting head, and the rod body is connected to the guide piece in a sliding mode in the axial direction of the rod body. One end of the thread pulling head is fixedly connected to the end, close to the rotating shuttle, of the rod body and bent upwards relative to the rod body, the other end of the rod body is rotationally connected to the position, deviating from the rotating center of the rotating piece, of the rotating piece, and when the rotating piece drives the rod body to move, the other end of the thread pulling head can be located between the needle falling hole and the rotating shuttle. According to the utility model, the sewing quality is further improved, and the manufacturing cost is obviously reduced on the basis.

The invention relates to the technical field of sewing equipment, in particular to a thread locking device and a sewing machine. The thread locking device comprises a machine body, a thread locking module, a bottom thread clamping module and a bottom thread tightening module, and a curved needle is installed in the machine body and used for driving a bottom thread to move. The thread locking module comprises a first driving part, a connecting rod assembly and a thread locking knife, the first driving part is installed on the machine body, the output end of the first driving part is connected with the connecting rod assembly, and the thread locking knife is installed at the end, away from the first driving part, of the connecting rod assembly; and the thread locking knife is driven to move towards or away from the curved needle. The bottom line clamping module is installed on the machine body and used for clamping a bottom line during line locking so as to prevent the bottom line from moving. The bottom thread tightening module is installed on the machine body and used for pulling the bottom thread during thread locking so as to tighten the bottom thread. According to the thread locking device and the sewing machine, the problem that an existing sewing machine thread locking device is low in thread locking success rate is solved.

The utility model relates to a sewing machine which comprises a rotating shuttle body, a shuttle peg and a detection device. The rotating shuttle body is arranged on the machine body and internally provided with a containing cavity. The shuttle peg is rotatably arranged in the containing cavity in the axial direction of the shuttle peg, the shuttle peg comprises a first panel, a second panel and a shuttle peg shaft, a side face hole is formed in the first panel, and the reflection coefficient of the second panel is larger than that of the first panel; detection signals of the detection device correspond to the side face holes, the detection device collects the detection signals reflected by the first panel or the second panel and generates reflection signals when the shuttle peg rotates, and the rotating speed of the shuttle peg is calculated through the reflection signals. According to the invention, the surface with a high reflection coefficient is arranged on the second panel and is compared with the side surface hole in the first panel, so that the laser sensor can recognize a hole signal more accurately, and the negative influence of high reflectivity of a material on the recognition capability of the sensor is overcome; the technical problem that in the prior art, when a shuttle peg rotates, high reflectivity of the material of the shuttle peg affects the rotating speed detection accuracy is solved.

The present invention addresses the problem of preventing hitch stitches caused by lower thread factors. A needle plate (19) has a needle hole (19a) and a guide hole (31) that communicates with the needle hole. The guide hole is offset toward a front surface of a sewing machine and is also offset in the rotation direction of a bobbin case from the line of vertical movement of a sewing needle. The needle plate also has a groove part (32) that extends from the guide hole (31) in front of the needle hole in the direction opposite the rotation direction of the bobbin case. The top of the groove part and the portion of the groove part that leads to the guide hole are open, and the remainder of the groove part is a bottom surface and a side wall. During a sewing operation, a lower thread that protrudes from the bobbin case extends upward through the needle hole or the guide hole. Depending on the movement direction of a holder (a frame 5) for an article to be sewed, the lower thread passes through the guide hole and is guided to the front side of the needle hole via the groove part. The bottom surface of the groove part is closed, which prevents an upper thread loop that rises along the lower thread from catching on the groove part.

An apparatus and method for applying stitches to a decorative component having a three dimensional configuration is provided. A head for applying stitches to a decorative component having a three dimensional configuration, including: a needle bar assembly operatively coupled to the head; a looper configured to cooperate with the needle bar assembly in order to provide a plurality of stitches in the decorative component, the looper rotating in a plane parallel to the decorative component; a post assembly configured to drive the looper in a reciprocating fashion in the plane, wherein the post assembly is operatively coupled to a motor configured to drive the needle bar assembly in a reciprocating fashion, the post assembly being operatively coupled to the head via a cylinder arm assembly and a downshaft assembly; and wherein the cylinder arm assembly is rotated in a synchronized manner with a rock frame through mechanical linkage connecting a rock frame drive shaft to the cylinder arm assembly.

The present application belongs to the technical field of sewing machines, and relates to a thread catching and air suction device of a sewing machine, which comprises: a rotating hook arranged below a bottom plate of the sewing machine and driven by a lower shaft to rotate along a first circumferential direction about an axis thereof; a thread cutting assembly comprising a fixed blade and a movable blade, the fixed blade being fixed below the bottom plate, the movable blade being in an arc-shaped plate structure, the arc shape of the movable blade being arranged at a distance from and surrounding an outer periphery of the rotating hook, the movable blade being rotatable from a sewing position to a thread cutting position along a second circumferential direction; a thread catching assembly comprising an arc-shaped thread catching plate, the arc shape of the thread catching plate being arranged at a distance from and surrounding the outer periphery of the rotating hook, an end of the thread catching plate being provided with a thread catching hole, the thread catching plate being rotatable from the sewing position to a thread catching position along the second circumferential direction; and an air suction assembly comprising an air suction pipe connected with a negative pressure device. The thread catching and air suction device of the sewing machine provided by the present application can solve the bird nest problem of the sewing machine, and has excellent high-speed adaptability and high motion precision.

The invention discloses a crescent rotating shuttle peg shell. The crescent rotating shuttle peg housing according to an embodiment of the present invention is characterized by integrally comprising: an upper thread guide part (10); a lower wire guide ring (20); a fixing aid (35); a center fixing part (30); and a discharge guide spring member (50).

To bring an interval of two sewing needles closer in a two needle sewing machine using a half-rotary shuttle.SOLUTION: A sewing machine includes: a needle bar reciprocating in the vertical direction while holding a sewing needle on which a needle thread is laid; a needle plate arranged below the needle bar, and having a needle hole in which the sewing needle is inserted; a shuttle arranged below the needle plate, and supplying a bobbin thread; and a thread cutter for cutting the needle thread and the bobbin thread in a state where the sewing needle is arranged above the needle plate. The thread cutter includes: a fixed knife fixed on a lower surface of the needle plate; and a movable knife rotatable between a stand-by position and an advance position around a pivot provided on the lower surface of the needle plate. The movable knife includes a handling part which enters a needle thread loop formed below the needle hole by rotating toward the advance position, and which divides the needle thread loop into a needle side portion and a seam side portion. The handling part enters the needle thread loop in such a manner that the needle side portion is arranged further outside in the radial direction of the pivot than the seam side portion and the bobbin thread.SELECTED DRAWING: Figure 10

A sewing machine that suppresses sewing defects is provided. The sewing machine includes: a sewing needle, held by a needle bar and moving back and forth while holding an upper thread; a shuttle, configured to hold a bobbin around which a lower thread is wound and which is housed in a bobbin case, and cooperating with the sewing needle to form a seam; a presser foot member, configured to press a to-be-sewn article at a sewing position directly below the sewing needle; a feeding mechanism, feeding the to-be-sewn article from the sewing position to a first direction; a needle drive portion, provided separately from a belt drive portion to synchronously move the sewing needle and the presser foot component in the first direction; and a control portion, which controls so that the needle drive portion and the belt drive portion operate independently.

The present invention addresses the problem of avoiding formation of a hitch stitch caused by a bobbin thread. A shuttle (3) includes: a bobbin case (40) for storing a bobbin-thread bobbin; an inner shuttle (50); and an outer shuttle (60). A needle location hole (51) is provided in the front surface of the upper part of the inner shuttle. A recess (52) is formed at a position (e.g., position to the left of the vertical motion line of a sewing needle) offset in the rotation direction of the outer shuttle from the needle location hole in the front surface of the upper part of the inner shuttle. The recess (52) is open at the front side and above and below, and the back side thereof forms a wall surface. The bobbin case is provided with a thread take-up member (41) for directing the bobbin thread delivered from the bobbin-thread bobbin toward the recess. The bobbin thread delivered from the bobbin-thread bobbin passes through the recess via the thread take-up member, and is directed toward a needle hole in a needle plate above the recess. Since the recess is at a position to the left of the vertical motion line of the sewing needle, the path of the bobbin thread from the shuttle to the needle hole is to the left of the vertical motion line of the sewing needle, and hitch stitch formation caused by the bobbin thread can be structurally avoided.

A winding device for feeding sewing thread from at least two bobbins to a sewing machine, in particular an overlock or coverlock machine, characterized in that it comprises: (a) a base plate with a receiving opening for detachable attachment to a bobbin holder or thread disc of the sewing machine, (b) at least two winding units in the form of trays, each forming a receiving space adapted to the outer contour of the bobbin, wherein the bobbin is mounted in the respective tray to be rotatably axially free with radial and axial play, and (c) at least one thread guide element, which is positioned in such a way as to ensure that the thread is taken off the bobbins in a substantially vertical manner.

The utility model discloses a damping structure of a rotating shuttle frame, which comprises a shuttle frame main body, the shuttle frame main body is rotatably arranged on the inner side of a shuttle race in a limited manner, a shuttle frame shaft core used for mounting a shuttle core is arranged at the center of the inner side of the shuttle frame main body, and a rubber damping component used for damping is sleeved on the shuttle frame shaft core; according to the rotating shuttle, the O-shaped groove is designed in the shuttle frame shaft core of the shuttle frame, and the O-shaped rubber ring with the damping effect is arranged in the O-shaped groove in a clamped mode, so that it can be guaranteed that the shuttle core can be stably installed on the shuttle frame shaft core without shaking, and the damping and noise reducing effects can be achieved when the whole rotating shuttle runs.

The utility model provides a shuttle shifter reset structure, which relates to the technical field of shuttle shifters and comprises a sewing machine table and a rotating shuttle seat arranged inside the sewing machine table. The rotating shuttle seat is used for supporting the whole structure and is internally provided with a reset mounting cavity; one end of the rotating shuttle driving shaft is rotationally connected into the rotating shuttle seat; the top of the rotary reset column is fixedly connected with the poke rod, and the bottom is rotatably mounted in the rotating shuttle seat; the rotating cam is connected to the rotating shuttle driving shaft, and the protruding end is in dynamic contact with the swing mechanism. One end of the swing mechanism abuts against the rotating cam, and the other end of the swing mechanism is matched with the reset mechanism. The reset mechanism is mounted in the reset mounting cavity, and a reset force is applied to the swing mechanism through a magnetic structure, so that the problems that a spring reset mechanism adopted for resetting of an existing shuttle shifting device is prone to fatigue, the reset force is attenuated after long-term use, and a gravity reset mechanism is only suitable for a low-speed loom; and the requirement for machining and assembling precision is high, and the cost is high.

The utility model discloses a sewing machine rotating shuttle frame structure which comprises a shuttle frame body, a shuttle frame door locking hole is formed in the edge of the top of the shuttle frame body, a pair of anti-collision embedded parts is arranged on the inner side of the shuttle frame door locking hole in an embedded mode, and the surfaces of the anti-collision embedded parts are flush with the surface of the shuttle frame door locking hole and the surface of the shuttle frame body. By embedding the anti-collision embedded part, noise generated by collision and displacement between the annular shuttle peg sleeve and the shuttle frame door locking hole is effectively reduced, a quieter working environment is created for sewing machine operators, and occupational health risks are reduced; the unstable condition of the annular shuttle peg sleeve is reduced, so that the rotating shuttle is more stable during high-speed operation, the stitch uniformity and stability of a sewing machine in the sewing process are guaranteed, and the sewing quality is improved; due to the stable rotating shuttle working state, the shutdown adjustment frequency caused by noise and unstable factors is reduced, the actual working time of the sewing machine is shortened, and therefore the production efficiency is improved; the structure is simple and implementation is easy.

The utility model discloses a sealed full lubrication swing shuttle transmission structure, it includes: the lower shaft driven gear of installation in the lower main shaft, the lower shaft bevel gear of setting in the lower shaft driven gear side and mutually meshed, the lower swing axle of parallel setting in the lower main shaft side and be used for supporting the lower shaft bevel gear, the eccentric device of setting in the lower shaft bevel gear side and through transmission belt pulley subassembly with main shaft module connection and the connecting rod of connecting eccentric device and the lower shaft bevel gear, wherein, the lower shaft driven gear, the lower shaft bevel gear, eccentric device and connecting rod all are located in the oil tank of frame lower. Adopt eccentric device through connecting rod and promote the lower shaft bevel gear swing, then through the lower shaft driven gear and drive the lower main shaft reciprocating rotation, thereby reduce the motion stroke, thereby can set up the lower shaft driven gear, the lower shaft bevel gear, eccentric device and connecting rod in the oil tank of frame lower, make transmission structure can be soaked in lubricating oil and realize full lubrication, greatly reduce transmission wear, promote transmission structure service life, can reduce the noise.

The invention discloses a rotating shuttle gap and thread hooking adjusting device and method for a two-needle sewing machine in the technical field of sewing machines, the adjusting device comprises a gap detection assembly and a gap adjusting assembly, and the gap detection assembly comprises a laser sensor transmitting module and a laser sensor receiving module; the gap adjusting assembly comprises a mounting frame, and a moving frame, a lifting driving mechanism, a transverse moving driving mechanism and a rotating shuttle driving mechanism which are fixed on the mounting frame; the moving frame is positioned below the shuttle frame and is in sliding connection with the mounting frame; the lifting driving mechanism is connected with the moving frame and can drive the moving frame to lift; the transverse moving driving mechanism is connected with the moving frame and can enable the moving frame to drive the shuttle frame to move; the rotating shuttle driving mechanism comprises a rotating shuttle driving shaft which is installed on the moving frame and can be connected with the rotating shuttle. According to the automatic thread hooking device, automatic adjustment of the rotating shuttle gap and thread hooking can be achieved, the adjustment precision and consistency are improved, the adjustment time is shortened, the labor intensity is reduced, and the production efficiency and the product quality are improved.

The invention discloses a robot dynamic adjusting method and system for a lock stitch sewing machine, and relates to the technical field of robotics.The system comprises a shuttle peg mechanical arm which is arranged at a shuttle peg body on the lock stitch sewing machine and used for automatically assembling and disassembling the shuttle peg body, and a coil mechanical arm is arranged on the side face of the shuttle peg mechanical arm and used for automatically assembling and disassembling the shuttle peg body; the coil mechanical arm is used for automatically selecting the specification of a coil body and automatically loading and unloading the coil body, a control module is loaded on the shuttle peg mechanical arm, and the control module collects position data and wire storage amount data of the coil body on the coil mechanical arm; the control module acquires required thread quantity data required by the shuttle peg body through the lock stitch sewing machine, and controls the coil mechanical arm to select the coil body with the corresponding thread storage quantity data to be loaded into the shuttle peg body according to the required thread quantity data; the automatic loading and unloading of the shuttle peg body and the automatic replacement of the coil body are realized, and the efficiency and the adaptability of the lock stitch sewing machine are improved.

The utility model belongs to the technical field of package sewing machines, and relates to a double-needle package sewing machine which comprises a machine head and a machine base, a straight needle movement mechanism is arranged in the machine head, a curved needle movement mechanism and a feeding mechanism are arranged in the machine base, a front straight needle and a rear straight needle are inserted into a needle chuck of the straight needle movement mechanism, and the front straight needle and the rear straight needle are arranged in the machine base. A front curved needle and a rear curved needle are inserted into a curved needle deflection crank of the curved needle movement mechanism, the front straight needle and the rear straight needle are distributed front and back and staggered left and right, the front curved needle and the rear curved needle are distributed front and back and staggered left and right, the front straight needle and the front curved needle are matched to sew a front chain stitch, and the rear straight needle and the rear curved needle are matched to sew a rear chain stitch. And the rear straight needle and the rear curved needle are matched to sew a rear chain stitch. The double-needle packet sewing machine has the advantages of being smooth and firm in sewing and good in sealing performance.

The invention belongs to the technical field of sewing machines, and relates to a thread hooking air suction device of a sewing machine, which comprises a rotating shuttle arranged below a bottom plate of the sewing machine, driven by a lower shaft and rotating around the axis of the lower shaft along a first circumferential direction; the thread trimming assembly comprises a fixed cutter and a movable cutter, the fixed cutter is fixed below the bottom plate, the movable cutter is of an arc-shaped piece structure, the arc shape of the movable cutter keeps a distance with the periphery of the rotating shuttle and is arranged around the periphery of the rotating shuttle, and the movable cutter can rotate from the sewing position to the thread trimming position in the second circumferential direction; the thread hooking assembly comprises an arc-shaped thread hooking plate, the arc shape of the thread hooking plate keeps a distance with the periphery of the rotating shuttle and is arranged around the periphery of the rotating shuttle, a thread hooking hole is formed in the end of the thread hooking plate, and the thread hooking plate can rotate from the sewing position to the thread hooking position in the second circumferential direction; the air suction assembly comprises an air suction pipe, and the air suction pipe is connected with the negative pressure device. The thread hooking and air suction device of the sewing machine can solve the bird nest problem of the sewing machine, and meanwhile has excellent high-speed adaptability and high movement precision.

The invention relates to the technical field of textile equipment, in particular to an anti-winding type residual thread active extracting and shearing device for thread ball bobbin case treatment, which comprises a suction pretreatment pipe, a negative pressure generation box, a thread drafting mechanism and a fusing separation module. The full-closed-loop pretreatment of catching, straightening, shearing and removing is achieved on a bobbin case transfer path, and the problems that due to the fact that follow-up blowing cleaning is relied on traditionally, remaining threads wind mechanical parts, an airflow channel is blocked, and equipment shutdown faults are caused due to incomplete treatment are effectively solved.

The utility model provides a can eliminate the shuttle core pipe of inertia relates to the textile tool technical field, include: the shuttle core pipe main part, the outer surface left edge of shuttle core pipe main part is established with the outer ring groove, the outer ring groove is closely sleeved and has the magnetism pipe sleeve, the magnetism pipe sleeve is made of the plastic injection of mixed ferrite magnetic powder, the outer ring groove groove surface in the convex has two place strip structure's ring groove directional relief, two place ring groove directional relief take the axis of the shuttle core pipe main part as the axle, the axle symmetry distribution is in the outer ring groove groove surface, compared with the way of embedding ferrite magnet in the prior art, the amount of ferrite magnet is reduced, the effect of saving cost is played, the assembly mode is more fast, and the assembly is more firm, solve the problem that the existing way of embedding ferrite magnet carries out the brake to the shuttle core pipe, the production cost is higher, the embedding process of ferrite magnet is complicated, because the size of shuttle core pipe and ferrite magnet is small, will further increase the assembly and manufacturing difficulty of shuttle core pipe.

The utility model relates to an installation structure of a curved needle frame fixing seat and sewing equipment, and the installation structure of the curved needle frame fixing seat comprises a supporting assembly which comprises a curved needle shaft and a blocking piece fixed to the curved needle shaft; the curved needle frame fixing base is rotationally arranged on the curved needle shaft in a sleeving mode, the axial position of the curved needle frame fixing base is limited by the blocking piece, and the curved needle frame fixing base has a first rotating direction around the curved needle shaft and a second rotating direction in the resetting process; the clutch shaft is movably arranged between the curved needle frame fixing seat and the blocking piece in a penetrating mode so as to limit or allow the curved needle frame fixing seat to rotate; and the limiting piece is mounted on the blocking piece and used for limiting the limiting position of the curved needle frame fixing seat moving in the second rotating direction. According to the mounting structure of the curved needle frame fixing seat, the limiting position of resetting of the curved needle frame fixing seat can be limited, it is ensured that the clutch shaft is combined with the blocking piece, and the curved needle frame fixing seat is kept at the correct position.

The invention belongs to the technical field of sewing machines, and particularly discloses a double-needle lifting rotating shuttle seat which comprises a sliding block mounting plate, a plurality of guide grooves are formed in the sliding block mounting plate, a rotating shuttle sliding block transition plate is arranged at the top of the sliding block mounting plate, and guide pins with the same number as the guide grooves are fixedly mounted on the outer wall of the rotating shuttle sliding block transition plate. The top of the rotating shuttle sliding block transition plate is fixedly connected with a needle plate installation plate, and the two sides of the needle plate installation plate are provided with a front rotating shuttle seat installation plate and a rear rotating shuttle seat installation plate respectively. In the sewing process, the sewing machine can be matched with double needles to conduct sewing work on cloth, after sewing is completed, thread residues are automatically cut off, the situation that the sewing quality is affected due to the fact that the thread residues are left is avoided, and after the thread residues are cut off, the sewing machine automatically descends to avoid the movement track of the large tray, so that the working continuity and stability of the sewing machine are guaranteed, and the working efficiency is improved; meanwhile, the distance between the front rotating shuttle seat component and the rear rotating shuttle seat component can be adjusted to adapt to the distance between two needles.

The invention relates to a double needle sewing machine, comprising a first needle bar, a second needle bar, a support shaft, a first rotating shuttle platform, a second rotating shuttle platform and a sliding driving mechanism; the first needle bar and the second needle bar are both installed on the support shaft, and the support shaft can simultaneously drive the first needle bar to make reciprocating movement relative to the first rotating shuttle platform and the second needle bar to make reciprocating movement relative to the second rotating shuttle platform along the radial direction of the support shaft; the first needle bar and the first rotating shuttle platform are respectively connected to the sliding driving mechanism, and the sliding driving mechanism can drive the first needle bar and the first rotating shuttle platform to synchronously move along the axial direction of the support shaft, and the distance between the first needle bar and the second needle bar is equal to the distance between the first rotating shuttle platform and the second rotating shuttle platform. The invention can realize synchronous adjustment of the distance between the two needle bars and the two rotating shuttle platforms, so that the double needle sewing machine can be suitable for the requirements of different garment process needle positions, thereby avoiding related problems caused by replacement of machine needles and having the function of facilitating needle position adjustment.

The invention relates to the technical field of sewing embroidery machine equipment, and discloses a wear-resistant self-lubricating thread hooking assembly for a sewing machine and a preparation method of the wear-resistant self-lubricating thread hooking assembly. The wear-resistant lubricating component is obtained by filling a pore channel in the base body with a wear-resistant lubricating material and curing and forming the wear-resistant lubricating material, and a reversely-buckled interlocking structure is formed between the wear-resistant lubricating component and the base body. The wear-resistant lubricating material comprises the following raw material components: a solid lubricant and a binder. The wear-resistant lubricating part is embedded in the base body of the thread hooking assembly, the wear-resistant and lubricating characteristics of the solid wear-resistant lubricating material are utilized, the service life of the rotating shuttle or the shuttle hook is prolonged, even if the material is abraded and falls off, the lubricating effect can be achieved, the smoothness of the rotating shuttle or the shuttle hook during operation is improved, and the service life of the rotating shuttle or the shuttle hook is prolonged. The obtained rotating shuttle or swinging shuttle is stable in size and structure, good in consistency and capable of being produced in batches.

The utility model discloses a shuttle peg for light reflection bottom line detection and a sewing machine bottom line detection device, relates to the technical field of sewing machines, and aims to solve the problem that reflection paper on an existing shuttle peg is short in service life. The shuttle peg comprises a shuttle peg body, and the shuttle peg body comprises a winding shaft and baffles arranged at the two ends of the winding shaft; a wire winding groove is formed between the two baffles, the baffles are provided with light passing holes used for signal light to penetrate through, the wire winding shaft is provided with a reflecting layer used for reflecting the signal light, and the reflecting layer is provided with a transparent protection layer, so that the reflecting layer can be prevented from being in contact with the external environment, and the reflecting layer is prevented from being polluted by sundries such as oil and wire wool. Therefore, the service life of the shuttle peg is prolonged.

Apparatuses, methods, and computer program products for quilting webs without compressing the webs. A quilting machine (10, 10a) includes a needle bar (160) to which needles (120) are attached, needle thread (284) passing through each needle (120), a looper shaft (188) to which loopers (282) are attached, a looper (282) corresponding to each needle (120) and from which looper thread (288) is provided to form stitches (530,532), and a retainer bar (190) to which spreaders (191) are attached to facilitate stitching. A drive pulley (132) powered by a first servo motor (130) rotates cranks (156) to move the needles (120) through a cycle and rotates a belt (166) which rotates an indexer pulley (168). Rotation of the indexer pulley (168) oscillates the looper shaft (188) and reciprocates the retainer bar (190). Another drive pulley (48) powered by a second servo motor (40) operates to move an input web (22) through the machine (10,10a) between chain stiches.

The sewing machine includes: a presser foot 1 which holds down a fabric on a throat plate 18; a presser holder 8 which supports the presser foot 1; a rotatable spreader 3 having a thread hole 14 through which sewing thread vertically passes; a spreader drive mechanism 4 which drives the rotation of the spreader 3; a reciprocating motion conversion mechanism 5 which converts the rotation of an upper shaft 7 into a linear reciprocating motion; and a link mechanism 6 which transmits the reciprocating motion produced by the reciprocating motion conversion mechanism 5 to the spreader drive mechanism 4. The spreader 3 and the spreader drive mechanism are both provided on the presser foot. The link 6 mechanism is provided on the presser holder 8.

Ensure proper winding of the lower thread onto the bobbin. [Solution] A bobbin winding device 60 comprises a bobbin 20 having a shaft portion 23 and disc portions 21 and 22 provided at both ends of the shaft portion, a rotating mechanism 61 that imparts rotational motion to the bobbin, and a bobbin supply mechanism 63 having a nozzle 64 that feeds out bobbin thread D from a bobbin thread supply source together with air, wherein the bobbin winding device 60 winds the bobbin thread onto the shaft portion of the bobbin by rotating the bobbin while the bobbin supply mechanism feeds the bobbin thread toward the bobbin, the bobbin shaft portion is provided with a thread-through hole 231 that penetrates in a direction perpendicular to the shaft portion, and the bobbin supply mechanism inserts the bobbin thread through the thread-through hole before winding the bobbin thread.

A sewing transmission system of a horizontal box covering machine comprises a crank connecting rod transmission mechanism which comprises a driving connecting rod linked with a machine head, a driving gear and a driven gear piece; the transmission base is in transmission connection with the driving gear; the driving shaft assembly comprises a front driving shaft and a rear driving shaft, and the rear driving shaft is in transmission connection with the driven gear piece; the swinging transmission shaft assembly comprises a front swinging transmission shaft and a rear swinging transmission shaft; the power transmission assembly comprises an input gear, a synchronous belt and an output gear, and the synchronous belt and the front driving shaft are in a vertical state; the shuttle hooking unit comprises a shuttle supporting shaft which is in transmission connection with the output gear; the swing feeding assembly comprises a swing connecting rod, a feeding swing shaft, a swing seat and a feeding tooth, wherein the swing seat and the feeding tooth are in linkage with the shuttle support shaft. The device has the advantages that by optimizing the structure, stable power distribution transmission is achieved through gear-connecting rod composite transmission and power shaft segmented connection, L-shaped power transmission is achieved through the vertically-arranged synchronous belt, and the sewing efficiency and reliability of the bag thick material are improved.