CN116837553A

CN116837553A - Automatic bottom thread connecting device of flat-seam type sewing equipment and automatic bottom thread connecting method thereof

Info

Publication number: CN116837553A
Application number: CN202310479326.6A
Authority: CN
Inventors: 章玉泉
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-04-28
Filing date: 2023-04-28
Publication date: 2023-10-03

Abstract

The invention discloses an automatic bottom thread receiving device of a flat-seam type sewing device, which comprises a machine head, a platen, a rotating shuttle, a thread quantity detector, a motor winder, a bottom thread clamp, a bottom thread breaker and a bottom thread pressing device. The invention also discloses an automatic bottom thread receiving method of the automatic bottom thread receiving device of the flat-seam type sewing equipment. Under the condition of the existing sewing machine function, the automatic bottom line connecting, bottom line pressing, bottom line winding and bottom line cutting functions are added, when a worker needs to replace cloth cut pieces or complete specific clothes making actions after finishing automatic bottom line cutting in one clothes making process, the automatic bottom line changing and cutting machine automatically controls all electromagnets, motors and electromagnetic valves under a machine platform by a system host machine to complete automatic wiring, automatic line pressing, automatic line winding and automatic line breaking processes in a very short time, and the defects of low efficiency and high cost of manual bottom line changing are overcome.

Description

Automatic bottom thread connecting device of flat-seam type sewing equipment and automatic bottom thread connecting method thereof

Technical Field

The invention belongs to the field of garment processing and sewing equipment, and particularly relates to an automatic bottom thread connecting device of flat-seam sewing equipment. The invention also relates to an automatic bottom thread receiving method of the automatic bottom thread receiving device of the flat-seam sewing equipment.

Background

People cannot leave the clothes to eat, and the clothes making cannot leave the sewing equipment. Sewing of clothing is mainly divided into two types according to stitch, one is chain stitch and the other is lock stitch, wherein sewing equipment capable of sewing out lock stitch is called a lockstitch sewing machine. The lockstitch sewing machine of the present invention includes various rotary shuttle lockstitch machines such as lockstitch sewing machines and embroidery machines. The inner part of the lockstitch sewing machine is provided with a rotating shuttle, a shuttle shell is arranged in the rotating shuttle, a bobbin wound with a bottom thread is arranged in the shuttle shell, and the lockstitch sewing machine is matched with a needle for sewing. The flat seaming machine has a disadvantage that after the rotating shuttle finishes the bobbin thread of one bobbin thread, another second bobbin thread wound with the bobbin thread is replaced, and because the bobbin thread is positioned in the rotating shuttle below the platen, the quantity of thread used during sewing clothing can not be observed, and the quantity of thread wound on the bobbin thread is very small, when the bobbin thread is used up, an operator can not find the bobbin thread in time, so that most of the cases are that the operator can find the bobbin thread without a long distance, and the operator is required to frequently stop to replace the bobbin thread when the operator is required to newly sew the operating piece without the bobbin thread. Every time the bobbin thread of one bobbin thread is used up, the second bobbin thread wound by the second bobbin thread is replaced in time, so that the labor intensity of workers is increased, the production efficiency is reduced, the production cost of enterprises is increased, and the whole economic benefit of the enterprises is not improved. The prior art basically simulates the operation process of manual bobbin thread replacement, such as an automatic bobbin thread replacement device and method of Chinese patent No. CN201610734226.3, a bobbin thread replacement mechanism and a sewing machine of Chinese patent No. CN201510514290.6, an automatic bobbin thread replacement device of Chinese patent No. CN201510050824.4 and the like, and the domestic or foreign patents are all characterized in that empty bobbin shells are taken out and replaced by full bobbin shells with good bobbin thread, and then the full bobbin shells are installed by machines, so that a mode of manual bobbin thread replacement is simulated, but time is not saved, the structure is complicated, the cost is too high, and the improvement efficiency is extremely limited, so that the automatic bobbin thread replacement device has commercial application only in some special models until now, and a large number of flat sewing machines can only manually replace the bobbin thread. The invention is innovated in that when the machine winds the shuttle peg, the shuttle peg is not required to be taken out, waiting is not required, the gap time of changing one cloth cutting piece every time an operator finishes one operation piece is utilized to detect the bottom line allowance, and when the detected bottom line is partial, the operations of line clamping, wiring, winding and cutting are completed at the gap time of changing the next cloth cutting piece by the operator. The invention has the advantages of full automation, high speed, high efficiency, low cost, and suitability for commercial production, and is beneficial to market popularization.

Disclosure of Invention

The technical problem to be solved by the technology is to overcome the defects of the prior art, and provide the automatic bottom line connecting device for the flat seam type sewing equipment, which automatically completes the operations of line clamping, line connection, line winding and line cutting. The invention also provides an automatic bottom thread receiving method of the automatic bottom thread receiving device of the flat-seam type sewing equipment.

The invention solves the technical requirements through the following technical proposal,

an automatic bottom thread receiving device of a flat seam type sewing machine comprises a machine head (2) of the sewing machine (1), a bedplate (3), a rotating shuttle (4), a thread quantity detector (5), a motor winder (6), a bottom thread clamp (7), a bottom thread breaker (8) and a bottom thread presser (9), and is characterized in that,

the machine head (2) of the sewing machine (1) is fixed on the bedplate (3), and a rotating shuttle (4) is fixed on a shaft of the machine head (2) positioned below the bedplate (3);

the automatic yarn feeding device is characterized in that a yarn quantity detector (5) is arranged on the side of the rotating shuttle (4), a motor winder (6) is arranged in front of the rotating shuttle (4), and a bottom yarn presser (9), a bottom yarn breaker (8) and a bottom yarn clamping device (7) are sequentially arranged on the side front of the rotating shuttle (4).

In order to obtain better technical effects, the rotating shuttle (4) comprises a rotating shuttle core (21), a shuttle shell (25) and a shuttle core (37);

the left and right corresponding inner side core walls of the rotating shuttle core (21) are respectively provided with an L-shaped shuttle shell clamping groove (22), the bottom of the inner side core wall is provided with a shuttle shell bayonet, and a shuttle shell hidden bayonet (23) is arranged at the shuttle shell bayonet; a shuttle stem (24) is also arranged at the center of the rotating shuttle core (21);

the bobbin case (25) is a cylinder with one open end and the other closed end, the end face of the bobbin case is arc-shaped, a bobbin case opening (35) is formed in the end face of the bobbin case, a round hole (31) is formed in the center of the end face of the bobbin case (25), a reverse and forward bobbin case (32) is arranged on the side wall of the bobbin case (25), a thread fixing hole (33) is formed in the front of the reverse and forward bobbin case (32), a threading hole (34) is formed in the obliquely upper side of the thread fixing hole (33), a wire outlet of the threading hole (34) is located in the center of the bobbin case opening (35) of the bobbin case (25), and a probe opening (36) is formed in the right lower side of the side wall of the bobbin case (25); a bobbin case plate machine (26) and a lock head (27) are arranged on the outer side of the closed end surface of the bobbin case (25), the lock head (27) consists of a sliding plate and a spring, one end of the spring is fixed on the bobbin case (25), one end of the sliding plate is connected with the spring, the other end of the sliding plate is clamped into a bobbin case bayonet, and the bobbin case plate machine (26) is movably connected with the sliding plate through the bottom of the sliding plate;

Two clamping blocks (39) are arranged on the shell wall of the shuttle shell (25);

the bobbin case plate machine (26) for pulling up the bobbin case (25) causes the lock head (27) to retract into the bobbin case (25), the rotating bobbin core (21) is fixed in the bobbin case (25) by pushing down a clamping block (39) on the wall of the bobbin case (25) along an L-shaped bobbin case clamping groove (22) and rotating clockwise, then placing down the bobbin case plate machine (26), and the lock head (27) extends forwards under the action of a spring and is clamped into a bobbin case hidden bayonet (23);

the shuttle core (37) consists of two identical disc-shaped end faces and a hollow column (38), wherein two ends of the hollow column (38) respectively penetrate through the circle centers of the two end faces and fix the two end faces at the two ends of the hollow column;

the hollow column (38) of the shuttle core (37) is sleeved on the shuttle core column (24) and is fixed in the rotating shuttle core (21);

the rotating bobbin (21) is fixed in the bobbin case (25).

In order to obtain a better technical effect, the length of the shuttle peg (24) is 2-10mm, the outer diameter XXmm, and the inner diameter of the hollow post (38) of the shuttle peg (37) is 4-5mm.

In order to obtain a better technical result, the bobbin stem (24) is 2-3mm long.

In order to obtain a better technical effect, the line measuring probe (5) comprises a first fixing frame (41), a guide rail seat (42), a displacement sensor (43) and a line measuring probe (44);

the linear quantity detector (5) is fixed on the lower side surface of the bedplate (3) through a first fixing frame (41), the position of the first fixing frame (41) can be freely adjusted up, down, left and right, a first guide rail seat (42) is fixed on the first fixing frame (41), a displacement sensor (43) is installed at one end of the first guide rail seat (42), a linear quantity probe (44) is installed at the top end of the displacement sensor (43), and a linear quantity electromagnet (45) is connected to the other end of the first guide rail seat (42).

In order to obtain better technical effects, the motor winder (6) comprises a second fixing frame (51), a second guide rail seat (52), a rail shaft (53), a spring clamp (54), a motor (55), a sliding rail (56) and a winding electromagnet (57), wherein the motor winder (6) is fixed on the lower side surface of the bedplate (3) through the second fixing frame (51), two second guide rail seats (52) and sliding rails (56) are arranged at the front end of the second fixing frame (51),

the guide hole is formed in the second guide rail seat (52), one end of the rail shaft (53) penetrates through the guide hole and then is connected with the winding electromagnet (57), the forefront end of the rail shaft (53) is connected with the spring clamp (54), a motor (55) is arranged on the rail shaft (53) and between the second guide rail seat (52) and the spring clamp (54), the motor (55) is connected with the second fixing frame (51) through the sliding rail (56), and the motor (55) can slide back and forth in the second fixing frame (51) along the sliding rail (56) under the action of the winding electromagnet (57).

In order to obtain better technical effects, the bottom line wire clamping device (7) comprises a slide rail seat (61), a slide rail plate (62), a wire clamping shear (63), a closing shear plate (64), tooth grooves (65), a motor seat (66), a servo motor (67), a gear (68) and an opening shear plate (69), the bottom line wire clamping device (7) is fixed on the lower side surface of the bedplate (3) through the slide rail seat (61), the slide rail seat (61) is provided with a sliding guide hole, one end of the slide rail plate (62) penetrates through the sliding guide hole and then is fixedly connected with the wire clamping shear (63), the closing shear plate (64) is arranged between the wire clamping shear (63) and the rotating shuttle (4), the tooth grooves (65) are arranged on the slide rail plate (62) between the sliding guide hole and the wire clamping shear (63), the motor seat (66) is further fixed on the slide rail seat (61), the servo motor (67) is installed on the motor seat (66), the rotating shaft of the servo motor (67) is fixed with the gear (68), and the gear (68) is meshed with the tooth grooves (65). A shearing plate (69) is fixed at one end of the sliding rail seat (61) close to the thread clamp scissors (63);

the thread clamp (63) is composed of a first upper shear blade (71), a first lower shear blade (72), a first thread clamp spring plate (73), a first upper shear handle (74) and a first lower shear handle (75), and the first lower shear handle (75) is fixedly connected with the first lower shear blade (72); the first upper scissor blade (71) and the first upper scissor handle (74) are fixedly connected in an L shape;

The first upper shear blade (71) is arranged between the first wire clamping and pressing plate (73) and the first lower shear handle (75), wherein the first upper shear blade (71) is arranged opposite to and movably connected with the first lower shear handle (75), and the first wire clamping and pressing plate (73) is fixedly connected with the first lower shear handle (75);

the lower scissor handle (75) is fixed at the front end of the sliding rail plate (62), and the tail end of the upper scissor handle (74) is provided with an opening and closing baffle column (76).

In order to obtain better technical effect, the bottom line breaker (8) is arranged below the bedplate (3), the bottom line breaker (8) comprises a breaker base (81), a line breaking electromagnet (82), a movable connecting rod (89) and a line breaking clamp (83),

a wire breaking electromagnet (82) is fixed on the wire breaker base (81), a movable connecting rod (89) is fixedly arranged at the front end of the wire breaking electromagnet (82),

the broken wire clamp wire scissors (83) are composed of a second upper scissors blade (84), a second lower scissors blade (85), a second wire clamp spring pressing plate (86), a second upper scissors handle (87) and a second lower scissors handle (88), the tail end of the second lower scissors handle (88) is fixed on the side wall of a wire breaker base (81), and the front end of the second lower scissors handle (88) is fixedly connected with the second lower scissors blade (85); the second upper scissor handle (87) is fixedly connected with the second upper scissor blade (84) in an L shape;

The second upper shear blade (84) is arranged between the second wire clamping elastic pressing plate (86) and the second lower shear blade (85), wherein the second upper shear blade (84) and the second lower shear blade (85) are oppositely arranged and movably connected, and the second wire clamping elastic pressing plate (86) is fixedly connected with the second lower shear blade (85);

the second upper scissor handle (87) is connected with the top end of the movable connecting rod (89).

In order to obtain better technical effect, a bottom wire pressing device (9) is arranged in front of the bottom wire breaker (8), the bottom wire pressing device (9) comprises a wire pressing device base (91), an air splicer (92), a U-shaped wire pressing rod (93), a movable shaft (94), a bracket (95), a movable rod (96), a wire pressing electromagnet (97), a front wire fixing rod (98) and a rear wire pressing groove fixing coil (99),

an air splicer (92) is fixed on a wire pressing device base (91), the air splicer (92) is positioned below the wire breaking clamp scissors (83), a bracket (95) is arranged on the right side of the air splicer (92), the bracket (95) comprises a bottom plate and two support arms, and the support arms and a wire pressing electromagnet (97) are fixed on the bottom plate;

the wire pressing electromagnet (97) comprises a telescopic shaft, and one end of the telescopic shaft is connected with the movable rod (96); two ends of the movable rod (96) are respectively connected with a U-shaped wire pressing rod (93), one end of the U-shaped wire pressing rod (93) close to the bottom wire breaker (8) is provided with four wire pressing openings, and the other end of the U-shaped wire pressing rod (93) is connected with a support arm of the bracket (95) through a movable shaft (94);

The air splicer (92) is provided with a front wire fixing rod (98) and a rear pressing groove wire fixing coil (99), and the front wire fixing rod (98) and the rear pressing groove wire fixing coil (99) are respectively arranged at two sides of the broken wire clamp scissors (83).

The rear wire pressing and fixing groove (99) is used for fixing the bottom wire, and when the U-shaped wire pressing rod (93) is pressed down, the bottom wire can be pressed into the air splicer (92) along four wire pressing openings of the U-shaped wire pressing rod (93); after the bottom line is connected, the bottom line reaches the right bottom of the back line pressing and fixing groove (99) under the action of self elasticity when the bottom line is wound, and therefore the scissors mouth of the bottom line breaker (8) can be used for cutting the bottom line.

In order to obtain a better technical effect, a bottom line seat (102) is arranged on the bedplate (3), and a group of line slots (103) are arranged at the front part of the bottom line seat (102); the bottom wire is placed on the bottom wire seat (102) in a cylindrical wire form, and is introduced into the rear pressing groove fixed coil (99) after entering the lower part of the bedplate (3) through the wire groove (103).

In order to obtain better technical effects, the device also comprises a host control system (101), wherein the host control system (101) controls the operation of the displacement sensor (43), the line detecting electromagnet (45), the motor (55), the winding electromagnet (57), the servo motor (68), the line breaking electromagnet (82), the air splicer (92) and the line pressing electromagnet (97).

In order to obtain better technical effects, a starting switch (104) of the air splicer (92) is arranged on the side wall of the air splicer (92) and below the U-shaped wire pressing rod (93).

The invention also provides a method for automatically connecting the bottom thread of the automatic bottom thread connecting device of the flat-seam sewing equipment, which comprises the following steps,

(1) The base line cross-over travel: a bottom thread on a bottom thread seat (102) enters the lower part of a platen (3) of a sewing machine (1) along a thread groove (103), a host control system (101) is started, a thread breaking electromagnet (82) is started, a pull-back movable rod (89) opens a knife edge of a thread breaking thread clamping scissors (83), the bottom thread passes through a front thread fixing rod (98), then passes through a rear thread pressing thread fixing groove (99), and finally the bottom thread is put into the knife edge of the thread breaking electromagnet (82); starting the host control system (101) again, enabling the wire breaking electromagnet (82) to stretch forwards under the action of a spring after being powered off, enabling the wire breaking electromagnet to act on the second upper scissor handle (87) through the movable connecting rod (89), enabling the second upper scissor blade (71) and the second lower scissor blade (72) to start to be closed, enabling the second lower scissor blade (72) to pull the lower bottom wire into the second wire clamping elastic pressing plate (73) and between the second lower scissor blades (72) before the bottom wire is cut, and enabling the wire head of the lower portion of the bottom wire to be clamped between the second wire clamping elastic pressing plate (73) and the second lower scissor blade (72) under the elastic force of the second wire clamping elastic pressing plate (73) when the wire clamping scissors (63) are completely closed and cut the bottom wire; the second thread clamping elastic pressing plate (73) finishes the operation of clamping the bottom thread under the pressure of the self elastic plate;

(2) Line quantity detection travel: after an operator presses a thread cutting pedal each time, a host control system (101) controls a detection electromagnet (45) to extend forwards, so that a displacement sensor (43) and a thread quantity probe (44) move forwards in a first guide rail seat (42), the thread quantity probe (44) passes through the bottom of a rotating shuttle (4) and then passes through a probe opening (36) on a shuttle shell (25) to enter a shuttle core (37), the thread quantity probe (44) cannot extend forwards any more when contacting a bottom thread on the shuttle core (37), a spring is arranged in the displacement sensor (43), the force for detecting the extending of the electromagnet (45) is larger than the force of the spring in the displacement sensor (43), the thread quantity probe (44) retracts into the displacement sensor (43) under the action of the extending force of the detection electromagnet (45), the retraction distance of the thread quantity probe (44) is calculated through potential induction, and the retraction distance of the thread quantity probe (44) is the thickness of the bottom thread on a hollow column of the shuttle core (37), and the preset conversion program in the host control system (101) displays the thickness of the thread quantity probe (44) on the hollow column of the bottom thread as the bottom thread of the hollow column;

when detecting that the bottom line is at a relatively small value, the host control system (101) directly controls the bottom line clamping device (7) to stretch forwards to clamp the bottom line after an operator steps on the bottom line cutting pedal next time, and clamps the bottom line before the bottom line cutting device in the machine head does not cut the bottom line yet;

When a preset full line value is detected or a sewing machine operator finishes changing the operation machine to enter the next sewing operation, the motor (55) stops winding, then the winding electromagnet (57) stops extending forwards, and the rail shaft (53) in the guide rail seat (52) is pulled back under the action of a spring on the electromagnet (57), so that the motor (55) fixed on the rail shaft (53) is pulled back in the sliding rail (56) at the same time; simultaneously, a broken wire electromagnet (82) fixed on a wire breaker base (81) starts to break wires, after a bottom wire is spliced, a bottom wire presser (9) pulls back a U-shaped wire pressing rod (93) under the action of a spring on a wire pressing electromagnet (97), the bottom wire is pulled up by a rear wire pressing groove wire fixer (99) under the action of a tensile force and passes through a gap in the middle to reach the right top end of the wire fixer, the electromagnet (82) is started and pulls away a scissor opening of a broken wire clamping scissor (83) through a movable connecting rod (89), the bottom wire is pulled into the scissor opening of the broken wire clamping scissor (83) under the elastic action of a rear wire pressing groove wire fixing coil (99) and the bottom wire, then the electromagnet (82) stops working, and pulls back the wire clamping scissor (83) under the action of the spring on the shaft of the electromagnet (82) to cut the bottom wire, and the front bottom wire is pulled into a space between an upper scissor edge (84) and a second wire clamping elastic pressing plate (86) while the bottom wire is clamped under the elastic action of the second wire clamping elastic pressing plate (86);

(3) The process of taking, winding and splicing the bottom wire clamp comprises the following steps: when the thread quantity detector detects that the thread quantity on the shuttle core (37) is too small, the servo motor (67) of the thread clamp (7) is started, the tooth groove (65) meshed with the gear (68) enables the sliding rail plate (62) to extend forwards in the sliding rail seat (61) under the rotation of the gear (68), the thread clamp (63) at the front end of the sliding rail plate (62) rapidly extends forwards to the shuttle shell opening (35), when the opening and closing baffle column (76) of the first upper shear handle (74) of the thread clamp (63) passes through the closing shear plate (64), because the closing shear plate (64) is in an arc shape, the opening and closing baffle column (76) is extruded by the closing shear plate (64) in the extending process, the first upper shear edge (71) and the first lower shear edge (72) start to be closed, the first lower shear edge (72) pulls the lower part of the lower thread into the first thread clamp spring plate (73) between the first lower shear edge (72) before the lower thread is cut, and when the thread clamp (63) is completely closed, the first lower thread clamp spring plate (73) is acted on the first lower thread clamp spring plate (73). When the thread clamp (63) is completely closed, the servo motor (67) starts to reversely rotate under the preset program, the front end gear (68) acts on the tooth groove (65) to enable the sliding rail plate (62) to retract in the sliding rail seat (61), and the thread clamp (63) at the front end of the sliding rail plate (62) retracts to the front end of the air splicer 92 by clamping the thread end of the shuttle core (37);

When the wire clamping scissors (63) pull back the bottom wire, the bottom wire pressing device (91) positioned on the wire pressing device base (91) starts to work under the action of the wire pressing electromagnet (97), the wire pressing electromagnet (97) enables the U-shaped wire pressing rod (93) fixed on the bracket (95) to start to press down under the action of the movable shaft (94), under the action of the wire fixing of the front wire fixing rod (98) and the rear wire fixing coil (99), the four wire pressing openings on the U-shaped wire pressing rod (93) press the two crossed bottom wires down into the splicing groove of the air splicer (92), and when the U-shaped wire pressing rod (97) presses down to the lowest, the air splicer (92) works and splices the bottom wire through the starting switch (104) on the air splicer (92) under the pressure of the connecting rod (105);

(4) Reciprocating cycle travel: in the working process of the sewing machine (1), the steps (2) - (3) are repeatedly executed to prepare for the next stroke, and the bottom thread is automatically supplemented when the bottom thread in the rotating shuttle (4) is insufficient.

The invention increases the functions of automatic bottom line connection, bottom line pressing, bottom line winding and bottom line cutting under the condition of not changing the functions of the existing sewing machine, and when a worker needs to replace cloth cut pieces or complete specific clothing making actions after finishing automatic bottom line cutting in a clothing making stroke, the technology automatically controls all electromagnets, motors and electromagnetic valves under a machine platform by a system host machine to complete the strokes of automatic wiring, automatic line pressing, automatic winding and automatic line breaking in a very short time. When the bobbin base thread is not fully wound, the sewing work can be started only when an operator presses the sewing pedal, because the control host of the sewing machine system can synchronously control the motor to stop winding in a very short time, and the sewing is directly performed after the base thread is rapidly cut off, the operator is not required to stop waiting, the full automation is as follows! Overcomes the defects of low efficiency and high cost of manual bottom line replacement, is suitable for the requirements of making a great part of clothes and provides a basis for the full-automatic production of the clothes in the future.

Drawings

FIG. 1 is a schematic view of a sewing machine according to an embodiment of the present invention;

FIG. 2 is a schematic view of a bottom view of a platen according to an embodiment of the present invention;

FIG. 3 is a diagram showing the effect of the bobbin thread clamp, the bobbin thread clamp and the bobbin thread breaker before the rotating shuttle according to the embodiment of the present invention;

FIG. 4 is a diagram showing the effect of the motor winder before the rotating shuttle according to the embodiment of the invention;

FIG. 5 is a schematic view of a rotating shuttle according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a bobbin case according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a bobbin structure according to an embodiment of the present invention;

FIG. 8 is a front view of a rotating shuttle peg according to an embodiment of the present invention;

FIG. 9 is a right perspective view of a rotating shuttle peg according to an embodiment of the present invention;

FIG. 10 is a schematic illustration of a bobbin installation according to an embodiment of the present invention;

FIG. 11 is a schematic illustration of a bobbin case installation according to an embodiment of the present invention;

FIG. 12 is a schematic diagram illustrating operation of a motor winder according to an embodiment of the present invention;

FIG. 13 is a schematic diagram of a motor winder according to an embodiment of the present invention;

FIG. 14 is a schematic diagram of a bottom line gripper waiting for operation according to an embodiment of the present invention;

FIG. 15 is a schematic diagram of the operation of the bottom wire clamp according to the embodiment of the present invention;

FIG. 16 is a schematic view of a wire clip shear in accordance with an embodiment of the present invention;

FIG. 17 is a schematic view of a wire gripping scissors according to an embodiment of the present invention;

FIG. 18 is a schematic view of a bottom line breaker according to an embodiment of the present invention;

FIG. 19 is a schematic diagram of a line measuring probe according to an embodiment of the present invention;

FIG. 20 is a schematic view of a base thread presser and an air splicer according to an embodiment of the present invention;

FIG. 21 is a schematic diagram illustrating the operation of a base thread presser and an air splicer according to an embodiment of the present invention;

fig. 22 is a schematic diagram of a post-slot die coil structure according to an embodiment of the invention.

Wherein 1-sewing machine, 2-head, 3-platen, 4-rotating shuttle, 5-thread quantity detector, 6-motor winder, 7-bobbin thread clamp, 8-bobbin thread breaker, 9-bobbin thread presser, 101-host control system, 102-bobbin thread seat, 103-thread groove, 104-start switch, 21-rotating shuttle bobbin, 22-L bobbin case neck, 23-bobbin case blind opening, 24-bobbin stem, 25-bobbin case, 26-bobbin case trigger, 27-lock, 31-round hole, 32-inverted bobbin case, 33-thread fixing hole, 34-threading hole, 35-bobbin case opening, 36-probe opening, 37-bobbin core, 38-hollow column, 39-fixture block, 41-fixing frame, 42-guide seat, 43-displacement sensor, 44-line quantity probe, 45-line detecting electromagnet, 51-second fixing frame, 52-second guide rail seat, 53-rail shaft, 54-spring clip, 55-motor, 56-slide rail, 57-winding electromagnet, 61-slide rail seat, 62-slide rail plate, 63-line clamping cutter, 64-closing cutter plate, 65-tooth socket, 66-motor seat, 67-servo motor, 68-gear, 69-opening cutter plate, 71-first upper cutter blade, 72-first lower cutter blade, 73-first line clamping spring plate, 74-first upper cutter handle, 75-first lower cutter handle, 76-opening and closing baffle column, 81-line breaker base, 82-line breaking electromagnet, 83-line breaking clamp cutter, 84-second upper shearing edge, 85-second lower shearing edge, 86-second wire clamping spring pressing plate, 87-second upper shearing handle, 88-second lower shearing handle, 89-movable connecting rod, 91-wire pressing device base, 92-air splicer, 93-U-shaped wire pressing rod, 94-movable shaft, 95-bracket, 96-movable rod, 97-wire pressing electromagnet, 98-front wire fixing rod and 99-rear wire pressing groove coil fixing.

Detailed Description

In the description of the present invention, it should be understood that the terms "front," "rear," "upper," "lower," "front," "rear," "left," "right," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the invention and simplify description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the invention. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. It will be understood by those skilled in the art that the foregoing terms are of specific significance in this application, and thus, although the invention has been described in some detail by way of example only, it is not limited to the above embodiments, but may include many other equivalent embodiments without departing from the spirit of the invention, the scope of which is defined by the scope of the appended claims.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

Example 1

Example 2

In comparison with the conventional general rotary hook 4, bobbin case 25 and bobbin 37, in order to allow the probe 44 of the thread quantity detector 5, the spring clip 54 of the motor winder 6, and the thread-gripping scissors 64 of the under thread gripper 7 to perform the work of detecting, winding, and gripping the thread, improvement is required for the rotary hook 4, bobbin case 25 and bobbin 37.

An automatic bottom thread receiving device of a flat-seam type sewing machine comprises a machine head (2) of the sewing machine (1), a bedplate (3), a rotating shuttle (4), a thread quantity detector (5), a motor winder (6), a bottom thread clamp (7), a bottom thread breaker (8) and a bottom thread presser (9),

a base wire seat (102) is arranged on the bedplate (3), and a group of wire slots (103) are arranged at the front part of the base wire seat (102); the bottom wire is placed on the bottom wire seat (102) in a cylindrical wire form, and is introduced into the rear pressing groove fixed coil (99) after entering the lower part of the bedplate (3) through the wire groove (103);

the rotating shuttle (4) comprises a rotating shuttle core (21), a shuttle shell (25) and a shuttle core (37);

the left and right corresponding inner side core walls of the rotating shuttle core (21) are respectively provided with an L-shaped shuttle shell clamping groove (22), the bottom of the inner side core wall is provided with a shuttle shell bayonet, and a shuttle shell hidden bayonet (23) is arranged at the shuttle shell bayonet; a shuttle stem (24) is also arranged at the center of the rotating shuttle core (21); the length of the shuttle stem (24) is 2-10mm;

When the trigger is pulled up, the contact part between the bottom of the trigger and the inside of the slide plate is retracted, so that the slide plate is retracted, and the lock head is retracted; when the rotating shuttle core (21) is put into the shuttle shell (25), the shuttle shell trigger (26) is put down, the sliding plate stretches forwards under the action of the spring, and the lock head (27) is clamped into the hidden bayonet (23) of the shuttle shell;

a bobbin case plate machine (26) for pulling up the bobbin case (25) causes the lock head (27) to retract into the bobbin case (25), and after a clamping block (39) on the outer case wall of the bobbin case (25) is pressed down along an L-shaped bobbin case clamping groove (22) and rotated clockwise in the rotating bobbin core (21), the bobbin case (25) is fixed in the bobbin case (25);

in order to fix the bobbin case (25), in the embodiment, two clamping blocks (39) are designed on the case wall of the bobbin case (25), two L-shaped bobbin case clamping grooves (22) are designed on the left and right core walls of the rotating bobbin (21), and a bobbin case hidden bayonet (23) is designed below the bobbin case bayonet of the rotating bobbin (21). When a bobbin case trigger (26) for pulling up the bobbin case (25) causes a lock head (27) to retract into the bobbin case (25), a clamping block (39) on the case wall is pressed down along an L-shaped bobbin case clamping groove (22) and then rotates clockwise, then the bobbin case trigger (26) is released to cause the lock head (27) to rotate into a bobbin case blind bayonet (23) through a bobbin case bayonet, the L-shaped bobbin case clamping groove (22) can prevent the bobbin case (25) from moving up and down, and the bobbin case blind bayonet (23) can prevent the bobbin case (25) from moving left and right, so that the bobbin case opening (25) is fixed in a rotating shuttle (4).

The shuttle core (37) consists of two identical disc-shaped end faces and a hollow column (38), wherein two ends of the hollow column (38) respectively penetrate through the circle centers of the two end faces and fix the two end faces at the two ends of the hollow column; the inner diameter of the hollow column (38) is 4-5mm, and as optimization, the length of the shuttle stem (24) is 2-3mm;

the rotating shuttle core (21) is fixed in the shuttle shell (25);

a line quantity detector (5) is arranged at the side of the rotating shuttle (4),

the line measuring probe (5) comprises a first fixing frame (41), a guide rail seat (42), a displacement sensor (43) and a line measuring probe (44);

The first guide rail bases (42) are used for enabling the line quantity probe (44) to slide back and forth in the first guide rail bases (42), the line quantity probe (44) stretches forward under the action of the line detection electromagnet (45), and in order to enable the positions of the line quantity probe (44) which can stretch forward to be consistent and not to deviate, two first guide rail bases (42) are selected, and the fact that after the first guide rail bases (42) are used for a long time, the position of the probe possibly deviates in the stretching process is avoided.

The front of the rotating shuttle (4) is provided with a motor winder (6), the motor winder (6) comprises a second fixing frame (51), a second guide rail seat (52), a rail shaft (53), a spring clamp (54), a motor (55), a sliding rail (56) and a winding electromagnet (57), the motor winder (6) is fixed on the lower side surface of the bedplate (3) through the second fixing frame (51), the front end of the second fixing frame (51) is provided with two second guide rail seats (52) and sliding rails (56),

the second guide rail seat (52) is provided with a guide hole, one end of the rail shaft (53) penetrates through the guide hole and then is connected with a winding electromagnet (57), the forefront end of the rail shaft (53) is connected with a spring clamp (54), a motor (55) is arranged on the rail shaft (53) and between the second guide rail seat (52) and the spring clamp (54), the motor (55) is connected with the second fixing frame (51) through the sliding rail (56), and the motor (55) can slide back and forth in the second fixing frame (51) along the sliding rail (56) under the action of the winding electromagnet (57);

A bottom line pressing device (9), a bottom line breaking device (8) and a bottom line clamping device (7) are sequentially arranged in front of the side of the rotating shuttle (4);

the bottom line wire clamping device (7) comprises a slide rail seat (61), a slide rail plate (62), a wire clamping cutter (63), a closing cutter plate (64), tooth grooves (65), a motor seat (66), a servo motor (67), a gear (68) and an opening cutter plate (69), wherein the bottom line wire clamping device (7) is fixed on the lower side surface of the bedplate (3) through the slide rail seat (61), the slide rail seat (61) is provided with a sliding guide hole, one end of the slide rail plate (62) penetrates through the sliding guide hole and then is fixedly connected with the wire clamping cutter (63), the closing cutter plate (64) is arranged between the wire clamping cutter (63) and the rotating shuttle (4), the tooth grooves (65) are arranged on the slide rail plate (62) between the sliding guide hole and the wire clamping cutter (63), the motor seat (66) is also fixed on the slide rail seat (61), the servo motor (67) is installed on the motor seat (66), the gear (68) is fixed on a rotating shaft of the servo motor (67), and the gear (68) is meshed and connected with the tooth grooves (65). A shearing plate (69) is fixed at one end of the sliding rail seat (61) close to the thread clamp scissors (63);

The action and principle of the opening shearing plate (69) and the closing shearing plate (64) are the same, namely, an iron plate with a certain angle is shown in fig. 16 and 17, and the position of the baffle plate is changed through the change of a fixed screw in a screw hole, so that the opening and closing degree of the scissors is adjusted;

the lower scissor handle (75) is fixed at the front end of the sliding rail plate (62), and the tail end of the upper scissor handle (74) is provided with an opening and closing baffle column (76);

the bottom line breaker (8) is arranged below the bedplate (3), the bottom line breaker (8) comprises a breaker base (81), a broken line electromagnet (82), a movable connecting rod (89) and a broken line clamping scissors (83),

the second upper scissor handle (87) is connected with the top end of the movable connecting rod (89);

a bottom line pressing device (9) is arranged in front of the bottom line breaker (8), the bottom line pressing device (9) comprises a pressing device base (91), an air splicer (92), a U-shaped pressing rod (93), a movable shaft (94), a bracket (95), a movable rod (96), a pressing electromagnet (97), a front fixing rod (98) and a rear pressing groove fixing coil (99),

In order to obtain a better technical effect, the device also comprises a host control system (101), wherein the host control system (101) controls the operation of the displacement sensor (43), the line detecting electromagnet (45), the motor (55), the winding electromagnet (57), the servo motor (68), the line breaking electromagnet (82), the air splicer (92) and the line pressing electromagnet (97);

a starting switch (104) of the air splicer (92) is arranged on the side wall of the air splicer (92) and below the U-shaped wire pressing rod (93);

four wire pressing openings on the U-shaped wire pressing rod (93) press two crossed bottom wires down into a splicing groove of the air splicer (92), when the U-shaped wire pressing rod (93) presses the bottom wires to the lowest, the U-shaped wire pressing rod (93) simultaneously presses a starting switch (104) of the air splicer (92) down when pressing down, the starting switch (104) controls and starts the air splicer (92), and then the air splicer (92) works and splices the bottom wires.

Example 3

An automatic bottom thread receiving method of an automatic bottom thread receiving device of a flat seam type sewing machine, which comprises the steps of,

The existing flat sewing machine is mainly a computer flat sewing machine, the power of the computer flat sewing machine is generally a servo motor, the servo motor has the advantages that a needle and a rotating shuttle can be stopped at a fixed position after a thread cutting pedal is stepped on, so that an automatic thread cutting device can cut out upper threads and bottom threads with proper lengths, and the needle can be stopped at the highest point, so that an operator can take out a sewing workpiece after lifting a presser foot, the rotating shuttle 4 can be stopped at a fixed position after the computer flat sewing machine finishes sewing an operating piece, the stop position of the rotating shuttle 4 is the stop position after the thread cutting pedal is stepped on as shown in the attached drawing 1 of the specification, a space gap is formed at the right lower part of the rotating shuttle 4, and a probe opening 36 is formed below the shuttle shell 25 in order to enable a thread detector 5 to enter the shuttle shell to detect the quantity of threads, and the probe opening 36 is formed in the lower part of the shuttle shell as shown in the attached drawing 3 of the specification. The conventional general bobbin case 25 is fixed in the rotary hook 4 by the bobbin case trigger being caught on the bayonet of the rotary hook stem 24 of the rotary hook 4 to prevent up and down movement, and by the locking head on the bobbin case trigger being caught on the bayonet of the rotary hook 21 to prevent left and right movement, so that the bobbin case 25 is fixed to the rotary hook 4 without moving. In order to allow the spring clip 54 of the motor winder 6 to extend into the bobbin 37 for winding under the action of the winding electromagnet 57, the length of the rotating shuttle stem 24 is cut to be only about several millimeters long, and a circular hole 31 is formed in the center of the bobbin case 25, so that the spring clip 54 can enter the bobbin 37 through the circular hole 31 and be elastically clamped in the stem tube in the center of the bobbin 37 by the spring of the spring clip 54, as shown in fig. 4 of the specification. After cutting the length of the rotary hook stem 24, the hook 25 cannot be fixed in the rotary hook 4, and in order to fix the hook 25, two clamping blocks 39 are designed on the shell wall of the hook 25, two L-shaped hook clamping grooves 22 are designed on the left and right core walls of the rotary hook 21, and a hook hidden bayonet 23 is designed below the hook bayonet of the rotary hook 21. When the bobbin case trigger for pulling up the bobbin case 25 retracts the lock head into the bobbin case, then the lock head is pressed down along the L-shaped bobbin case clamping groove 22 by the clamping block 39 on the case wall and then rotated clockwise, then the bobbin case trigger is released to rotate the lock head into the bobbin case blind bayonet 23 by the bobbin case bayonet, the L-shaped bobbin case clamping groove 22 can prevent the bobbin case 25 from moving up and down, and the bobbin case blind bayonet 23 can prevent the bobbin case 25 from moving left and right, so that the bobbin case 25 is fixed in the rotary hook 4, the rotary hook core column 24 which is cut to be about one centimeter long and the hollow column 38 which is four to five millimeters at the center of one end face of the bobbin core 37 play a role of fixing the bobbin core 37, and the bobbin core 37 can smoothly run during high-speed rotation. In order to allow the thread clamp 63 of the thread clamp 7 to clamp and cut the bobbin thread in position, as shown in fig. 2 of the specification, the invention designs a thread fixing hole 33 in front of the inverted bobbin case 32 of the bobbin case 25, the thread fixing hole 33 prevents the bobbin thread from sliding out of the inverted bobbin case 32 when sliding, a threading hole 34 is designed in the middle and upper position of the thread fixing hole 33, the outlet of the threading hole 34 is positioned at the center line position of the bobbin case 35 of the bobbin case 25, because the bobbin thread must pass through the needle eye when being pulled into the fabric of the operation member by the upper thread, and the bobbin thread must pass through the outlet of the threading hole 33 and be positioned under the needle eye, so that the thread clamp 63 can cut and clamp the bobbin thread when being advanced into the bobbin case 35 under the action of the servo motor 67, the sewing machine operator works without continuous and without stopping the sewing machine, after stepping on the thread cutting pedal when finishing a work member, the other workpiece to be sewn is replaced, and the thread quantity detector 5 detects the quantity of the residual bobbin thread in the bobbin 37 every time the thread cutting pedal is pressed, after the thread cutting pedal is pressed to start the sewing machine thread cutting device to cut the upper thread and then the bobbin thread is cut, as shown in fig. 8 of the specification, the host control system 101 controls the thread quantity detector 5 to work, the thread detecting electromagnet 45 works and pushes the displacement sensor 43 forwards, the displacement sensor 43 is positioned on the two guide rail seats 42 of the fixing frame 41, the thread quantity probe 44 on the displacement sensor 43 enters the bobbin 37 through the probe opening 36 below the bobbin case 25 when pushed forwards, the displacement distance of the thread quantity probe 44 is calculated through the displacement sensor 43 under the extrusion of the residual thread quantity of the bobbin 37, so that the host control system 101 knows the quantity of the residual thread quantity of the bobbin 37 through an electric signal and displays the information on the display screen of the machine head 2, when the amount of thread on the bobbin 37 is detected to be below a certain preset value. When the operator of the sewing machine steps on the thread cutting pedal again to sew the next operation piece, the thread clamping device 7 of the sewing machine is started at the same time, as shown in fig. 6 of the accompanying drawings, the thread clamping device 7 of the sewing machine is fixed under the platen 3 by the slide rail seat 61, the servo motor 67 is started, the slide rail plate 62 stretches forward in the slide rail seat 61 through the front end gear 68 acting on the tooth groove 65, the thread clamping scissors 63 at the front end of the slide rail plate 62 rapidly stretches forward to the bobbin case opening 35, as shown in fig. 7 of the accompanying drawings, when the opening and closing baffle column 76 of the upper scissors handle 74 of the thread clamping scissors 63 passes through the closing scissors plate 64, because the closing scissors plate 64 is in the arc shape, the opening and closing baffle column 76 is extruded by the closing scissors plate 64 in the process of the advancing, the upper scissors edge 71 and the lower scissors edge 72 start to pull the lower part of the lower thread between the first thread clamping scissors 73 and the lower scissors 72 before the lower thread is cut, and when the thread clamping scissors 63 is completely closed and cuts the lower part of the lower thread is clamped between the first thread clamping scissors 73 and the lower scissors 72 under the action of the first scissors 72. When the thread clamp 63 is completely closed, the servo motor 67 starts to reversely rotate under the preset program, the front end gear 68 acts on the tooth groove 65 to retract the sliding rail plate 62 in the sliding rail seat 61, and the thread clamp 63 at the front end of the sliding rail plate 62 retracts to the front end of the air splicer 92 by clamping the thread end of the shuttle 37. As shown in fig. 9 of the specification, when the wire scissors 63 pull back the bottom wire, the bottom wire presser 9 on the presser base 91 starts to work under the action of the presser electromagnet 97, the presser electromagnet 97 starts to press down the U-shaped presser bar 93 fixed on the bracket 95 under the action of the movable shaft 94, under the action of the front wire fixing bar 98 and the rear wire fixing coil 99, the four wire openings on the U-shaped presser bar 93 press down two crossed bottom wires into the splicing groove of the air splicer 92, and when the U-shaped presser bar 97 presses down to the lowest, the air splicer 92 works and splices the bottom wire through the start switch 104 on the air splicer 92 under the pressure of the connecting rod 105. At the same time as the bobbin thread clamp 7 and the bobbin thread presser 9 are operated, the motor winder 6 is started to operate, as shown in fig. 5 of the specification, the winding electromagnet 57 is started and pushed forward, the motor winder 6 is fixed under the platen 3 by the fixing frame 51, the rail shaft 53 in the rail seat 52 is deduced by the winding electromagnet 57 forward, the motor 55 fixed on the rail shaft 53 is pushed forward in the sliding rail 56 at the same time, the spring clip 54 at the forefront end of the rail shaft is pushed into the round hole 31 in the center of the shuttle 37, and the column tube in the center of the shuttle 37 is blocked by the spring of the spring clip 54. When the air splicer 92 splices the bobbin thread, the motor 55 starts and starts winding, the bobbin thread on the bobbin thread seat 102 is wound into the bobbin 37 through the thread groove 103, the thread amount detector 5 detects the thread amount in the bobbin 37 every several seconds while the motor 55 is wound, when a preset full thread amount is detected, or when the sewing machine operator finishes replacing the operator to enter the next sewing operation, the motor 55 stops winding, then the winding electromagnet 57 stops extending forwards, the rail shaft 53 in the rail seat 52 is pulled back under the action of the spring on the electromagnet 57 shaft, and the motor 55 fixed on the rail shaft 53 is pulled back in the sliding rail 56 at the same time. Simultaneously, the wire breaking electromagnet 82 fixed on the wire breaker base 81 starts to break wires, as shown in the attached drawing 9 of the specification, after the bottom wires are spliced, the bottom wire presser 9 pulls back the U-shaped wire pressing rod 93 under the action of the spring on the shaft of the wire pressing electromagnet 97, the bottom wires are pulled up by the rear wire pressing groove wire fixer 99 under the action of tensile force and pass through a gap in the middle to the right top end of the wire fixer, the electromagnet 82 is started and pulls up the scissors mouth of the wire breaking wire clamping scissors 83 through the movable connecting rod 89, the bottom wires are pulled into the scissors mouth of the wire breaking wire clamping scissors 83 under the elastic action of the rear wire pressing groove wire fixer 99 and the bottom wires, then the electromagnet 82 stops working, the wire clamping scissors 83 are pulled back under the action of the spring on the shaft of the electromagnet 82 to cut the bottom wires, the front bottom wires are pulled between the upper scissors edge 84 and the second wire clamping pressing plate 86 while the bottom wires are cut, finally the servo motor 67 continues to rotate reversely under the action of the elastic force of the second wire clamping plate 86, the preset servo motor 68 acts on the program, the front end gear 68 acts on the tooth socket plate 62 to enable the scissors mouth to be clamped by the sliding rail seat 62, and the front end toothed plate 62 is retracted to be clamped by the scissors mouth of the scissors mouth, and the front end 63 is retracted by the arc-shaped wire clamping scissors mouth is retracted by the scissors mouth of the scissors mouth, and the front end is retracted by the front end of the scissors back is retracted by the front end of the cutter 63, and the front end toothed plate is retracted by the front end of the cutter spring, and the front end of the cutter is held by the cutter, and the front end of the cutter is held.

The fixed position in this embodiment means that the rotating shuttle gap will stop at a relatively fixed angle, and the gap means that the rotating shuttle has no half-edge gap of the shuttle wall. The rotating shuttle rotates when running, before the servo motor does not reduce price, the stepping motor needs a very complex system to stop at a fixed position, and stopping at a fixed position has two benefits, namely, the needle punctures up and down on the cloth when sewing, if the stopping position is random, the needle is mostly just stopped in the cloth, and a bit on the cloth, at the moment, you can not take out the sewn cloth, a person needs to hand a hand to shake the machine head to rotate the needle to stop the needle at the highest position, and the second is that the length of the cutting line cannot be determined, and if the upper line is too short, the needle flies out when sewing next time.

With the popularization of the servo motor, the machine head can stop at a fixed position when stopping the needle, namely the needle is positioned at the highest position, the positions of the rotating shuttle and the needle are identical-! So that the space gap can be stopped at a fixed position after the rotating shuttle is stopped in a rotating way.

The rotary shuttle consists of a main body and a rotary shuttle core, the rotary shuttle core can rotate in the rotary shuttle, the shuttle shell can not rotate, and the rotary shuttle is required to rotate, so that in order to prevent the rotary shuttle core from rotating, the top of the rotary shuttle core is provided with a bayonet, here a positioning hook, a bottom hook is fixed on a machine table, and the bottom hook cannot move, so that the bottom hook clamps the rotary shuttle core to ensure that the position of the rotary shuttle core is not moved relative to the machine table when the rotary shuttle rotates at a high speed.

The bobbin case has a bobbin case on the side wall, the bobbin case is on the side wall because the bobbin is flat and can only be taken out from the side surface, so the bobbin case is on the side wall, the bobbin case is put into the rotating bobbin case, and the bobbin case is provided with a plurality of bottom threads, and the number of the bottom threads are required to be replaced is smaller as the number of the bottom threads is larger, so the rotating bobbin case is not a complete cylinder, but a larger gap is formed at the bottom of the rotating bobbin case.

The positions of the rotating shuttle core and the shuttle shell are fixed by the positioning hooks without great change, and the line quantity detector is also fixed, so that the quantity of the bottom line in the shuttle core can be detected from the notch.

However, the position of the rotating shuttle is not fixed, the rotating shuttle is not rotated only when the rotating shuttle is stopped, one side of the rotating shuttle is free of space, the other side of the rotating shuttle is provided with a rotating shuttle wall, the wall is not movable and cannot be modified, the size and the position of the rotating shuttle cannot be easily changed after the design of the rotating shuttle is developed for hundreds of years, and the probe cannot enter the shuttle shell if the position of the rotating shuttle cannot be stopped at a fixed position; and the second is that the rotating shuttle needs to rotate to adjust the position, and the range is not large.

The probe mouth is selected through multiple observation, and although the shuttle shell and the rotating shuttle core can be opened at any position, the upper half part is provided with a thread cutting device which is not movable, the position of the shuttle skin is also not movable, only the lower right corner can be opened, the rotating shuttle can only be opened at the notch part without the rotating shuttle wall, and the notch is positioned at the lower right corner when the needle is stopped.

The invention controls all electromagnetic valves, motors and sensors by a host control system, so that a working stroke can be completed in a very short time, even if an operator wants to start sewing operation at any time when winding, he only needs to press a starting pedal, in the time period that the sewing machine rotates to hook the first needle bottom thread and does not hook the second needle yet, the host system firstly stops the winding motor and then retracts the winding motor through the winding electromagnet, the winding motor is retracted and simultaneously starts the thread breaking electromagnet to cut the bottom thread, so that the bottom thread does not wind the whole bobbin case, the operator wants to start sewing at any time, the winding process does not need to stop at all, and the quantity and the time interval of the required winding quantity of the bobbin core can be set through the host. Therefore, no matter how long the sewing machine operator changes one sewing piece, the host control system can finish the automatic wiring, automatic line pressing, automatic winding and automatic line breaking processes of the base line when the operator steps on the next piece to be sewn through program setting, if the time for changing some special operating pieces is very short, a manual line changing key on a display screen can be pressed down to wait for a while, and the invention keeps the conventional manual line winding device on the sewing machine table, so that the base line can be directly and manually changed. The invention is not limited to single lockstitch sewing machines, but is applicable to sewing equipment of all lockstitch sewing principles, including combination type multi-body machines, and special machines modified by lockstitch sewing machine principles, such as embroidery machines, double needle lockstitch sewing machines, high-foot lockstitch sewing machines, etc. The air splicer and the thread-clamping scissors are all common sewing machine equipment, and the electromagnetic valve and the electromagnet are more common industrial equipment, so the equipment is very stable and durable.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An automatic bottom thread receiving device of a flat seam type sewing machine comprises a machine head (2) of the sewing machine (1), a bedplate (3), a rotating shuttle (4), a thread quantity detector (5), a motor winder (6), a bottom thread clamp (7), a bottom thread breaker (8) and a bottom thread presser (9), and is characterized in that,

2. The automatic bottom thread take-up device for flat seam sewing apparatus as claimed in claim 1, wherein the rotating shuttle (4) comprises a rotating shuttle core (21), a bobbin case (25) and a shuttle core (37);

the rotating bobbin (21) is fixed in the bobbin case (25).

3. The automatic bottom line connecting device of flat seam sewing equipment according to claim 1 or 2, characterized in that the line measuring probe (5) comprises a first fixing frame (41), a guide rail seat (42), a displacement sensor (43) and a line measuring probe (44);

4. The automatic bottom line connecting device of the flat seam type sewing equipment according to claim 1 or 2, wherein the motor winder (6) comprises a second fixing frame (51), a second guide rail seat (52), a rail shaft (53), a spring clamp (54), a motor (55), a sliding rail (56) and a winding electromagnet (57), the motor winder (6) is fixed on the lower side surface of the bedplate (3) through the second fixing frame (51), the front end of the second fixing frame (51) is provided with two second guide rail seats (52) and sliding rails (56),

5. The automatic bottom thread receiving device of the flush joint type sewing equipment according to claim 1 or 2, wherein the bottom thread clamp (7) comprises a slide rail seat (61), a slide rail plate (62), thread clamp scissors (63), a closing scissors plate (64), a tooth socket (65), a motor seat (66), a servo motor (67), a gear (68) and an opening scissors plate (69), the bottom thread clamp (7) is fixed on the lower side surface of the platen (3) through the slide rail seat (61), the slide rail seat (61) is provided with a sliding guide hole, one end of the slide rail plate (62) penetrates through the sliding guide hole and then is fixedly connected with the thread clamp scissors (63), a closing scissors plate (64) is arranged between the thread clamp scissors (63) and the rotating shuttle (4), the slide rail plate (62) between the sliding guide hole and the thread clamp scissors (63) is provided with the tooth socket (65), the slide rail seat (61) is also fixedly provided with the seat (66), the servo motor seat (67) is arranged on the motor seat (66), one end of the servo motor seat (67) is fixedly provided with the gear (68), and the tooth socket (68) is meshed with the rotating shaft (65). A shearing plate (69) is fixed at one end of the sliding rail seat (61) close to the thread clamp scissors (63);

6. The automatic bottom thread receiving device of the flat seam sewing equipment according to claim 1 or 2, wherein the bottom thread cutter (8) is arranged below the platen (3), the bottom thread cutter (8) comprises a thread cutter base (81), a thread cutter electromagnet (82), a movable connecting rod (89) and a thread cutter clip (83),

7. The automatic bottom thread connecting device of the flush joint type sewing equipment according to claim 1 or 2, wherein a bottom thread pressing device (9) is arranged in front of the bottom thread cutting device (8), the bottom thread pressing device (9) comprises a thread pressing device base (91), an air splicer (92), a U-shaped thread pressing rod (93), a movable shaft (94), a bracket (95), a movable rod (96), a thread pressing electromagnet (97), a front thread fixing rod (98) and a rear thread pressing fixing coil (99),

8. The automatic bottom thread receiving device of the flat seam sewing equipment according to claim 1, characterized in that a bottom thread seat (102) is arranged on the bedplate (3), and a group of thread grooves (103) are arranged at the front part of the bottom thread seat (102); the bottom wire is placed on the bottom wire seat (102) in a cylindrical wire form, and is introduced into the rear pressing groove fixed coil (99) after entering the lower part of the bedplate (3) through the wire groove (103).

9. The automatic bottom line connecting device of the flush joint type sewing apparatus according to claim 1, further comprising a host control system (101), wherein the host control system (101) controls the operation of the displacement sensor (43), the line detecting electromagnet (45), the motor (55), the winding electromagnet (57), the servo motor (68), the line breaking electromagnet (82), the air splicer (92) and the line pressing electromagnet (97).

10. The method for automatically splicing the bottom thread of the automatic bottom thread splicing device of the flat bed sewing machine according to any one of the claims 1 to 9, comprising the steps of,

(3) The process of taking, winding and splicing the bottom wire clamp comprises the following steps: when the thread quantity detector detects that the thread quantity on the shuttle core (37) is too small, a servo motor (67) of the thread clamp (7) is started, a tooth slot (65) meshed with the gear (68) enables a sliding rail plate (62) to extend forwards in a sliding rail seat (61) under the rotation of the gear (68), a thread clamp (63) at the front end of the sliding rail plate (62) rapidly extends forwards to a bobbin case opening (35), when an opening and closing baffle column (76) of a first upper shear handle (74) of the thread clamp (63) passes through a closing shear plate (64), because the closing shear plate (64) is in an arc shape, the opening and closing baffle column (76) is extruded by the closing shear plate (64) in the extending process, the first upper shear edge (71) and the first lower shear edge (72) start to be closed, the lower part of the lower thread is pulled into a first thread clamp spring plate (73) between the first lower shear edge (72) before the lower thread is cut, and when the thread clamp (63) is completely closed, the lower thread clamp is acted on the first lower thread clamp spring plate (73) by the first lower thread clamp spring plate (73);

when the thread clamp (63) is completely closed, the servo motor (67) starts to reversely rotate under the preset program, the front end gear (68) acts on the tooth groove (65) to enable the sliding rail plate (62) to retract in the sliding rail seat (61), and the thread clamp (63) at the front end of the sliding rail plate (62) retracts to the front end of the air splicer 92 by clamping the thread end of the shuttle core (37);