CN112210910A

CN112210910A - Residual bottom thread removing device and sewing machine thereof

Info

Publication number: CN112210910A
Application number: CN201910629980.4A
Authority: CN
Inventors: 陈旭辉
Original assignee: Cheesiang Sewing Machine SH Co ltd; Chee Siang Industrial Co Ltd
Current assignee: Cheesiang Sewing Machine SH Co ltd; Chee Siang Industrial Co Ltd
Priority date: 2019-07-12
Filing date: 2019-07-12
Publication date: 2021-01-12

Abstract

The invention relates to a residual bobbin thread clearing device and a sewing machine thereof, wherein the residual bobbin thread clearing device is applied to the sewing machine and is provided with a movable arm, a cutter and a suction mechanism, the movable arm is connected with the cutter and can be driven to enable the cutter to move into a winding space of a shuttle peg through the movable arm, so that the cutter can cut off the bobbin thread in the winding space, and the suction mechanism clears the bobbin thread cut off by the cutter to enable the shuttle peg to be in an initial state of not winding the bobbin thread.

Description

Residual bottom thread removing device and sewing machine thereof

Technical Field

The invention relates to a clearing device for a bobbin of a sewing machine, in particular to a residual bobbin thread clearing device which can completely separate the bobbin thread residual on the bobbin from the bobbin.

Background

In a sewing machine using the sewing principle, a full-rotation rotary hook or a half-rotation shuttle is used to wind a bobbin around which a bobbin thread is wound, and most sewing machines using the sewing principle have a bobbin case that can accommodate the bobbin.

However, in order to increase the rotation speed of the sewing machine, the bobbin has not enough capacity to accommodate the bobbin thread, and the length of the bobbin thread is relatively limited, so that the bobbin must be frequently replaced to prevent the bobbin thread from being exhausted, and when the bobbin thread is replaced, not only the sewing machine must be stopped, but also the bobbin thread must be manually replaced by an operator, and the productivity cannot be relatively improved.

In order to overcome the above disadvantages, an automatic bobbin exchanging device is currently available in the sewing machine industry, and when detecting that the bobbin thread wound around the bobbin is about to be consumed, the automatic bobbin exchanging device will simultaneously remove the bobbin case and the bobbin from the rotating shuttle, so that the bobbin case and the bobbin are both separated from the rotating shuttle, and then assemble another group of the bobbin case and the bobbin with the fully wound bobbin thread on the rotating shuttle at the same time to achieve the effect of automatically exchanging the bobbin.

In addition, since a part of the bobbin thread remains in the bobbin from which the bobbin thread is to be depleted, even though the automatic bobbin exchanging apparatus can separate the bobbin from which the bobbin thread is to be depleted from the rotary hook, the automatic bobbin exchanging apparatus cannot assist the operator in removing the bobbin thread remaining in the bobbin, so that the operator needs to spend an additional time to remove the bobbin thread remaining in the bobbin before manually rewinding the bobbin thread on the bobbin.

Disclosure of Invention

The invention aims to automatically remove the bottom thread wound on the shuttle peg to shorten the operation time of removing the shuttle peg, and relatively reduce the time for preparing the shuttle peg by an operator.

In order to achieve the above objects, the present invention relates to a remaining bobbin thread removing device, which is mounted on a sewing machine and has a thread cutting mechanism, a moving mechanism and a suction mechanism, wherein the sewing machine has a sewing machine body having a rotary hook and a bobbin replacing device assembled to the sewing machine body and capable of selectively assembling or separating the bobbin to or from the rotary hook.

The bobbin thread cutting mechanism is provided with a cutter, the cutter can cut off a bobbin thread positioned in the winding space, the movable mechanism is provided with a movable arm capable of changing positions, the movable arm can drive the cutter to move to the inside of the winding space, the cutter is positioned at a cutting position to cut off the bobbin thread positioned in the winding space, and the suction mechanism can form suction airflow in the winding space to remove the bobbin thread cut off by the cutter, so that the bobbin core is in an initial state of not winding the bobbin thread.

In this embodiment, the thread cutting mechanism further includes a thread cutting driving source capable of driving the cutter to rotate, the thread cutting driving source is connected to the movable arm and moves synchronously in a process that the movable arm drives the cutter to move to the cutting position, in addition, the thread cutting driving source is assembled with a thread cutting transmission member connected to the cutter, the thread cutting transmission member is provided with an air blowing hole, and the air blowing hole can flow out an air blowing flow.

The shuttle peg is provided with a penetrating space formed by recessing from the surface profile of the shuttle peg, the penetrating space is communicated with the winding space and is used for accommodating a part of the cutter when the cutter is positioned at the cutting position, in a preferred embodiment, the shuttle peg is provided with two spacing plates arranged at intervals and a winding shaft piece positioned between the two spacing plates, the winding space is formed by the two spacing plates and the winding shaft piece together, one of the two spacing plates and the winding shaft piece are respectively recessed to form a spacing groove and a shaft piece groove, and the spacing groove is communicated with the shaft piece groove, so that the spacing groove and the shaft piece groove together form the penetrating space.

In addition, the remaining bobbin thread removing device is further provided with an aligning mechanism, the aligning mechanism is connected between the shuttle peg and a transmission piece, and when the shuttle peg is assembled in the transmission piece, the aligning mechanism can align the penetrating space with the cutter positioned at the cutting position, so that the cutter can penetrate into the penetrating space.

The positioning mechanism is provided with a guiding component and a positioning component, the guiding component can be close to the distance between the shuttle peg and the transmission component, so that the penetrating space can be close to the cutter at the cutting position, and when the penetrating space is close to the cutter at the cutting position through the guiding component, the positioning component can limit the relative angular position between the shuttle peg and the transmission component, so that the shuttle peg cannot rotate relative to the transmission component.

The bobbin is assembled in a bobbin case, the bobbin case has a thread clamping elastic sheet and can be driven to rotate, and the rotating bobbin can wind back the bottom thread between the bobbin case and the thread clamping elastic sheet in the bobbin case.

The invention also provides a sewing machine with the residual bottom thread removing device, which is matched with a shuttle peg provided with a winding space for use, and is characterized in that:

a sewing machine body having a rotating shuttle; and

and the bobbin replacing device is assembled on the sewing machine body and can selectively assemble or separate the bobbin to or from the rotating shuttle.

The bobbin thread removing device has the advantages that the movable arm of the movable mechanism can drive the cutter to move to the inside of the winding space, so that the cutter cuts off the bobbin thread in the winding space, the bobbin thread is cut off by the cutter and separated from the bobbin, and the suction mechanism can form suction airflow in the winding space to remove the bobbin thread cut off by the cutter, so that the residual bobbin thread removing device can completely remove the bobbin thread remained on the bobbin without an operator to confirm whether the bobbin thread remains, and the residual bobbin thread removing device can shorten the operation time of removing the bobbin and reduce the time for the operator to prepare the bobbin.

Drawings

FIG. 1 is a perspective view of a first preferred embodiment of an automatic bobbin thread winding sewing machine;

FIG. 2 is an exploded view of the automatic bobbin thread winding sewing machine in a first preferred embodiment;

FIG. 3A is an exploded view of the bobbin assembly;

FIG. 3B is a schematic view of another embodiment of the bobbin set;

fig. 4 is an exploded view of the bobbin changing device of fig. 2;

FIG. 5 is an exploded view of the suture introduction device of FIG. 2;

FIG. 6 is an exploded view of the bobbin set movement mechanism of FIG. 5;

FIG. 7 is a cross-sectional view of the bobbin set movement mechanism;

FIG. 8 is a schematic view of the bobbin case being mounted to the third transmission member;

figure 9 is an exploded view of the bottom wire clamping mechanism of figure 5;

FIG. 10 is an exploded view of the wire trap release mechanism of FIG. 5;

FIG. 11 is an exploded view of the bobbin control mechanism of FIG. 5;

FIG. 12 is an exploded view of the remaining bobbin thread removing device of FIG. 2;

fig. 13 is a schematic view of the bobbin being mounted to the first transmission member;

FIG. 14A is a schematic view of the respective bobbin sets assembled by the rotating shuttle and the bobbin set moving mechanism;

FIG. 14B is a schematic view of the movable frame moving toward the direction approaching the rotating shuttle;

FIG. 14C is a schematic view of the first gripper assembly being clamped to the first bobbin set;

FIG. 14D is a schematic view of the second gripper assembly being clamped to the second set of mandrels;

FIG. 14E is a schematic view of the movable frame moving away from the rotating shuttle;

FIG. 14F is a schematic view of the movable frame rotating clockwise;

FIG. 14G is a schematic view of the movable frame being again close to the rotating shuttle;

FIG. 14H is a schematic view of the second gripper assembly releasing the second set of mandrels;

fig. 14I is a schematic view of the first gripper assembly positioned directly in front of the movement mechanism of the bobbin set;

FIG. 14J is a schematic view of the positioning post penetrating into the positioning groove;

FIG. 14K is a view of the latch clip clamped to the annular channel;

fig. 14L is a schematic view of the bobbin of the first bobbin group being connected to the first transmission member by the alignment mechanism;

fig. 15A is a schematic view showing a state where both the bobbin case and the bobbin are separated;

FIG. 15B is a schematic view of the cutter in the cutting position;

FIG. 15C is a schematic view of another embodiment of a pumping mechanism;

FIG. 15D is a schematic view in partial cross-section of FIG. 15C;

FIG. 16A is a schematic view of a bobbin thread being wound around a bobbin;

FIG. 16B is a schematic view of the bobbin thread control mechanism controlling the position of the bobbin thread;

figure 16C is a schematic view of the clamp assembly moved to a clamping position;

FIG. 16D is a schematic view of the clamp assembly clamping to the bobbin thread;

FIG. 16E is a schematic view of the gripper assembly moved to the first ready position;

FIG. 16F is a schematic view of the wire clamp release mechanism clamping to the bobbin thread;

FIG. 16G is a schematic view of the clamp assembly moving to the first guide position;

FIG. 16H is a schematic view of the blade severing the bobbin thread;

fig. 17A is a schematic view of both the bobbin case and the bobbin in an assembled state;

FIG. 17B is a schematic view of the winding of the bobbin thread into the guide groove;

FIG. 17C is a schematic view of the gripper assembly moved to a second ready position;

FIG. 17D is the schematic view showing the first clamp driving medium contacting the roller

FIG. 17E is a schematic view of the clamp assembly moving to the second guide position;

fig. 17F is a schematic view of a wound bobbin thread introducing hole;

FIG. 18 is a schematic view of a bobbin set movement mechanism in a second preferred embodiment;

fig. 19 is a schematic view of a bobbin set moving mechanism in the third preferred embodiment.

Description of reference numerals: 1-automatic winding bottom thread sewing machine; 10-sewing machine body; 11-a base; 12-a rotating shuttle; 13-a worktop board; 14-a fixing frame; 15-a wire clamp; 20-changing the bobbin device; 21-bobbin set moving assembly; 211-a mobile drive source; 212-a transmission rod; 22-a movable frame; 221-a first connection end; 222-a second connection end; 223-a coupling; 23-a first jaw assembly; 231-a first jaw mount; 231 a-first pivot joint; 232-a first fixed jaw; 233-a first movable jaw; 233a — a first clamp; 234 — a first jaw driver; 24-a second jaw assembly; 241-a second jaw base; 242-a second fixed jaw; 243-a second movable jaw; 243 a-second nip; 244-a second jaw driver; 25-a bobbin set rotating assembly; 251-a rotation drive source; 252-a drive train; 252 a-first transfer gear; 252 b-a second transmission gear; 30-a bobbin thread lead-in device; 31-bobbin set movement mechanism; 311-a first motion assembly; 3111-a first drive source; 3112-a first transmission; 3112 a-land; 3112 b-blade; 3112 c-a blade portion; 3112 d-connecting part; 3113-first linkage group; 3113 a-a first drive pulley; 3113 b-a first driven pulley; 3113 c-first belt; 312-a second motion assembly; 3121-a second drive source; 3122-a second transmission; 3123-a second linkage group; 3123 a-a second drive pulley; 3123 b-a second driven pulley; 3123 c-a second belt; 313-a third motion assembly; 3131 — a third drive source; 3132 — a third transmission member; 3132 a-a pressing block; 3133-a third linkage group; 3133 a-a linkage rack; 3133 b-a linkage gear; 3134-a reduction action member; 3134 a-a restoring force; 314-a synchronization component; 3141-synchronization groove; 3142-synchronous convex column; 315-a stop assembly; 3151-anti-migration unit; 3151 a-ring groove; 3151 b-a latch clip; 3151 c-latch; 3152-anti-rotation unit; 3152 a-positioning studs; 3152 b-positioning grooves; 32-a bottom line clamping mechanism; 321-a first moving assembly; 3211-a first moving jig drive source; 3212-a first clamp drive; 322-a second moving assembly; 3221-a second moving clamp drive source; 3222 — a second clamp drive; 323-a clamp assembly; 3231-a movable clamp; 3231 a-grip groove; 3231 b-stop pin; 3232-fixing the clamp; 3232 a-clamp block; 3232 b-Pin hole; 3233-clamp drive source; 324-avoidance unit; 3241-swing plate; 3242-assembling the plates; 3242 a-arc guide; 3243-roller; 3244-guide wheel; 3245-a holder; 3245 a-Retention force; 33-a wire clamping release mechanism; 331-a release lever; 3311-pivot joint; 3312-push portion; 3313-acting part; 3314-clamping space; 332-releasing the drive source; 34-a ground line control mechanism; 341-an adjustment member; 3411-a pivot shaft; 3412-an adjustment plate; 3412 a-through hole; 3413-connecting column; 342-adjusting the drive source; 40-residual bottom line removing device; 41-a movable mechanism; 411 — Movable drive Source; 412-a movable arm; 42-a wire cutting mechanism; 421-tangent drive source; 422-cutting knife; 423-tangent transmission; 423 a-air blowing holes; 43-a suction mechanism; 431-suction port; 44-a registration mechanism; 441-a guide assembly; 4411-a magnet; 442-a positioning assembly; 4421-bumps; 4422-a positioning groove; 50-a shuttle peg group; 501-a first shuttle peg group; 502-a second set of mandrels; 51-a bobbin; 511-a spool member; 511 a-a first spooling section; 511 b-a second crimping section; 511 c-shaft recess; 511 d-stop flange; 512-limiting plate; 512 a-limit groove; 513-a winding space; 514-penetrating the space; 52-bobbin case; 521-a housing; 522-shuttle shaft; 523-closed end; 524-open end; 525-a receiving space; 526-wire guides; 527-wire groove; 528-wire clip spring; 528 a-guide port; 529-hook arm; 529 a-line hole; 530-line blocking sheet; 530 a-spring arm; 60-bottom line; 61- -winding the bobbin thread; 62-supply source ground line; a-drawing the air flow; b-blowing out an air flow; c-cut off position; d1 — first path; d2 — second path; d3 — third path; d4 — fourth path; an L-axis of motion; s1-detached state; s2 — initial state; s3-assembled state; p1-first ready position; p2-clamping position; p3-first guide position; p4-second ready position; p5-second guiding position.

Detailed Description

The invention will be further described with reference to specific embodiments and drawings, the advantages and features of which will become apparent as the description proceeds.

Referring to fig. 1 and 2, in a first preferred embodiment, the automatic bobbin thread winding sewing machine 1 of the present invention is used with a bobbin set 50 (as shown in fig. 3) and has a sewing machine body 10, a replacement bobbin device 20, a bobbin thread introducing device 30 and a remaining bobbin thread removing device 40. referring to fig. 3, the bobbin set 50 has a bobbin 51 capable of winding a bobbin thread 60 (as shown in fig. 14A) and a bobbin case 52 capable of being assembled to the bobbin 51, the bobbin 51 is provided with a bobbin member 511 and two limiting plates 512, a partial section of the bobbin member 511 is provided as a first bobbin part 511a, and a remaining section of the bobbin member 511 is provided as a second bobbin part 511b having an outer diameter larger than that of the first bobbin part 511a, wherein the two limiting plates 512 are arranged at intervals and formed respectively at the first bobbin part 511a and the second bobbin part 511b such that the bobbin member 511 is located between the two limiting plates 512, further, a winding space 513 capable of accommodating the bobbin thread 60 (as shown in fig. 14A) is formed between the bobbin 511 and the two limiting plates 512, as shown in the figure, the bobbin 511 is recessed to form a shaft groove 511c communicated with the winding space 513, and one of the limiting plates 512 is recessed to form a limiting groove 512a communicated with the winding space 513, so that the shaft groove 511c is communicated with the limiting groove 512a, so that the shaft groove 511c and the limiting groove 512a together form a through space 514 recessed from the surface profile of the bobbin 51, however, the bobbin 511 of the bobbin 51 has a first winding portion 511a and a second winding portion 511B for convenience of illustration only, as also shown in fig. 3B, the bobbin 511 extends a limiting flange 511d outwards, and the limiting flange 511d is close to the limiting plate 512 formed with the limiting groove 512 a.

As shown in fig. 3A, the bobbin case 52 has a housing 521 presenting a hollow state, the housing 521 is provided with a shuttle shaft 522 presenting a hollow state inside, and a closed end 523 and an open end 524 are respectively formed at opposite ends, and a receiving space 525 capable of receiving the bobbin 51 is formed between an inner edge of the housing 521 and an outer edge of the shuttle shaft 522, wherein the housing 521 penetrates through a wire guiding hole 526 communicating with the receiving space 525 and is recessed from the open end 524 toward the closed end 523 to form a wire guiding groove 527 communicating with the receiving space 525, in this embodiment, the housing 521 is assembled with a thread clamping spring 528 capable of guiding the bobbin thread 60 (shown in fig. 17B) from the wire guiding groove 527 to the wire guiding hole 526, and the housing 521 extends outward to form a hook arm 529, wherein one side of the thread clamping spring 528 is provided with a guiding opening 528a, and the hook arm 529 is recessed from the outer edge of the hook arm 529 to form a wire hole 529a, and in addition, the closed end 523 of the housing 521 is assembled with a thread guard 530 for restricting the bobbin thread 60 (shown in fig. 17B) to the thread hole 529a, the thread guard 530 having an elastically deformable elastic arm 530a near the thread hole 529a, and the elastic arm 530a being located at a side of the hook arm 529 for preventing the bobbin thread 60 from coming off the thread hole 529 a.

Referring to fig. 2, the sewing machine body 10 has a base 11 (the drawing only shows a partial state of the base 11), and the base 11 has a horizontally disposed lower shaft (not shown) therein, which can drive a rotating shuttle 12 assembled inside the base 11 to rotate, wherein a working table 13 is disposed above the base 11, and is connected to a fixing frame 14 and a thread clamping device 15 connected to the fixing frame 14.

Referring to fig. 2 and 4, the bobbin replacing device 20 is located in front of the rotary shuttle 12, and includes a bobbin set moving assembly 21, a movable frame 22, a first clamping jaw assembly 23, a second clamping jaw assembly 24, and the rotary shuttle 12, the bobbin set moving assembly 21 is used to drive the movable frame 22 to selectively approach or depart from the bobbin set rotating assembly 25, and includes a moving driving source 211 capable of generating moving power and a transmission rod 212 assembled to the moving driving source 211, in this embodiment, the moving driving source 211 is connected to the movable frame 22, and the transmission rod 212 is fixed to the fixed frame 14 of the sewing machine body 10, so that when the moving driving source 211 generates moving power, the moving driving source 211 moves axially along the transmission rod 212, so that the movable frame 22 can move to approach or depart from the rotary shuttle 12.

The movable frame 22 has a first connection end 221 and a second connection end 222 far from the first connection end 221, and an assembly portion 223 connected to the movable driving source 211 is provided between the first connection end 221 and the second connection end 222, wherein the first jaw assembly 23 has a first jaw base 231 formed by two symmetrical plates, the first jaw base 231 is assembled with a fixed first fixed jaw 232, and a first pivot portion 231a is provided at a side far from the first fixed jaw 232, the first fixed jaw 232 is fixedly connected to the first connection end 221, and the first pivot portion 231a is pivotally connected to a first movable jaw 233 capable of swinging, in addition, the first movable jaw 233 has a first clamping portion 233a (as shown in fig. 14C), and a first jaw driver 234 connected to the movable frame 22 is assembled at an end far from the first clamping portion 233a, the first jaw driver 234 can drive the first movable jaw 233 to swing back and forth, so that the first clamping portion 233a can selectively approach or separate from the first fixed jaw 232.

The second jaw assembly 24 is connected to the second connecting end 222 of the movable frame 22, and mainly includes a second jaw base 241 having a structure similar to that of the first jaw base 231, a second fixed jaw 242 having a structure similar to that of the first fixed jaw 232, a second movable jaw 243 (as shown in fig. 14D) having a structure similar to that of the first movable jaw 233, and a second jaw driver 244 having a structure similar to that of the first jaw driver 234, and the second jaw base 241, the second fixed jaw 242, the second movable jaw 243, and the second jaw driver 244 are connected to each other in a manner similar to that of the first jaw assembly 23, so that the description of the structure of the second jaw assembly 24 is omitted.

The bobbin set rotating assembly 25 has a rotating driving source 251 and a transmission set 252, the rotating driving source 251 can generate rotating power and is fixed on the fixed frame 14 of the sewing machine body 10, and the transmission set 252 is located between the rotating driving source 251 and the transmission rod 212 of the bobbin set moving assembly 21 and has a first transmission gear 252a assembled on the rotating driving source 251 and a second transmission gear 252b meshed with the first transmission gear 252a, wherein the second transmission gear 252b is coaxially assembled on the transmission rod 212, so that when the rotating driving source 251 can generate rotating power, the first and second transmission gears 252a and 252b can drive the movable frame 22 to rotate with the transmission rod 212 as the axis, and, since the moving driving source 211 of the bobbin set moving assembly 21 and the first and second

clamping jaw assemblies

23 and 24 are both connected to the movable frame 22, when the movable frame 22 rotates, the first and

second jaw assemblies

23, 24 are rotated in synchronism with each other.

Referring to fig. 2 and 5, the bobbin thread guiding device 30 is assembled to the fixed frame 14 of the sewing machine body 10, and has a bobbin set moving mechanism 31, a bobbin thread clamping mechanism 32, a thread clamping releasing mechanism 33 and a bobbin thread controlling mechanism 34, as shown in fig. 5 to 7, the bobbin set moving mechanism 31 is mainly composed of a first moving assembly 311, a second moving assembly 312, a third moving assembly 313 and a synchronizing assembly 314, as shown in the figure, the first moving assembly 311 has a first driving source 3111 and a first transmission 3112, the first driving source 3111 is assembled to the fixed frame 14 of the sewing machine body 10 and can generate rotation power to drive the first transmission 3112 to rotate, and the first transmission 3112 is coaxially arranged on a motion axis L parallel to the first transmission 3112 and forms a connecting disc 3112a at one end, wherein the first transmission 3112 is provided with a blade 3112b located below the connecting disc 3112a, the blade 3112b is made of an elastic material and has a blade portion 3112c (shown in fig. 10) located below the connection plate 3112a and a connection portion 3112d (shown in fig. 10) located at the rear side of the connection plate 3112a, in this embodiment, the movement axis L overlaps the axis of the first transmission member 3112, and the first driving source 3111 is connected to the first transmission member 3112 through a first linkage 3113, wherein the first linkage 3113 has a first driving pulley 3113a assembled to the first driving source 3111 and a first driven pulley 3113b assembled to the first driven pulley 3112, and the first driving pulley 3113a is assembled to a first belt 3113c of the first driven pulley 3113 b.

The second moving assembly 312 has a second driving source 3121 capable of generating a rotating power and a second transmission member 3122 spaced apart from the first transmission member 3112, the second driving source 3121 is assembled to the fixed frame 14 of the sewing machine body 10 and connected to the second transmission member 3122 through a second linkage group 3123, such that the second driving source 3121 can drive the second transmission member 3122 to rotate through the second linkage group 3123, and the second transmission member 3122 is coaxially disposed on the first transmission member 3112, such that the axis of the second transmission member 3122 overlaps the moving axis L, as shown in the figure, the second linkage group 3123 has a second driving pulley 3123a assembled to the second driving source 3121 and a second driven pulley 3123b assembled to the second transmission member 3122, and the second driving pulley 3123a is connected to the second driven pulley 3123b through a second belt 3123 c.

The third motion assembly 313 has a third driving source 3131 capable of generating a moving power and a third driving element 3132 coaxially disposed on the motion axis L, the third driving source 3131 is installed with a third linkage group 3133 and drives the third linkage group 3133 to move away from or abut against the third driving element 3132, and two ends of the third driving element 3132 respectively penetrate through the first driving element 3112 and the second driving element 3122, and the third driving element 3132 can move relative to the first and second driving elements 3112 and 3122, so that the third driving element 3132 is movably assembled to the first and second driving elements 3112 and 3122, in this embodiment, when the third driving source 3131 releases the third linkage group 3133 to move away from the third driving element 3132, a pressing block 3132a connected to the third driving element 3132 and the second driving element 3122 together press a return acting element 3134 located between the second driving element 3122 and the return acting element 3134 is pressed as a spring to form a return pressing block 3134a acting on the return acting force 3134a, the force of the reset acting force 3134a is smaller than the moving force of the third driving source 3131, so that when the third driving source 3131 generates the moving force to drive the third linkage group 3133 to push against the third driving element 3132, the third driving source 3131 overcomes the reset acting force 3134a of the reset acting element 3134 to push the third driving element 3132 to perform a linear motion along the motion axis L, so that the third driving element 3132 is away from the third driving source 3131.

The synchronizing assembly 314 is located between the second transmission member 3122 and the third transmission member 3132, and can allow the second transmission member 3122 and the third transmission member 3132 to rotate simultaneously, as shown in the figure, the synchronizing assembly 314 has a synchronizing groove 3141 formed in the second transmission member 3122 and a synchronizing protrusion 3142 formed in the third transmission member 3132, the synchronizing groove 3141 is in a long strip shape, and the synchronizing protrusion 3142 penetrates through the synchronizing groove 3141 and can move axially in the synchronizing groove 3141 when the third transmission member 3132 moves.

Referring to fig. 8, the bobbin case 52 of the bobbin set 50 is mounted to the third transmission member 3132 of the third moving member 313, a limiting member 315 is disposed between the bobbin case 52 and the third transmission member 3132, the limiting member 315 includes an anti-moving unit 3151 capable of limiting the bobbin case 52 from moving axially relative to the third transmission member 3132 and an anti-rotating unit 3152 capable of limiting the bobbin case 52 from rotating relative to the third transmission member 3132, as shown in the figure, the anti-moving unit 3151 includes an annular groove 3151a, a latch clip 3151b and a latch 3151c, the annular groove 3151a is formed in a partial section of the third transmission member 3132 protruding from the first transmission member 3112, the latch clip 3151b and the latch 3151c are pivotally connected to each other, and both the latch clip 3151b and the latch 3151c are mounted to the closed end 523 of the bobbin case 52, in this embodiment, both the latch clip 3151b and the latch 3151c are components belonging to the bobbin case 52, when the bobbin case 52 is installed on the third transmission member 3132, the third transmission member 3132 passes through the bobbin 522 of the bobbin case 52, such that a partial section of the third transmission member 3132 protrudes beyond the closed end 523 of the bobbin case 52, and the latch 3151c can be engaged with the annular groove 3151a to limit the bobbin case 52 from moving axially.

As shown in the drawings, the rotation preventing unit 3152 has a positioning protrusion 3152a and a positioning groove 3152b, the positioning protrusion 3152a is formed on the third transmission member 3132 of the third moving assembly 313 and is arranged at intervals in the annular groove 3151a of the movement preventing unit 3151, and the positioning groove 3152b is formed on the shuttle shaft 522 of the shuttle case 52, wherein when the shuttle case 52 is mounted on the third transmission member 3132, the third transmission member 3132 passes through the shuttle shaft 522 of the shuttle case 52, so that the positioning protrusion 3152a moves into the positioning groove 3152b to restrict the shuttle case 52 from rotating.

As shown in fig. 9, the bobbin thread clamping mechanism 32 includes a first moving component 321, a second moving component 322, and a clamp component 323, the first moving component 321 includes a first moving clamp driving source 3211 capable of performing a single-stage moving stroke, and a first clamp transmission member 3212 connected to the first moving clamp driving source 3211, the first moving clamp driving source 3211 and the first clamp transmission member 3212 are connected to an avoiding unit 324, and the avoiding unit 324 enables both the first moving clamp driving source 3211 and the first clamp transmission member 3212 to be displaced relative to the second moving component 322, so that when the first moving clamp driving source 3211 drives the first clamp transmission member 3212 to move, both the first moving clamp driving source 3211 and the first clamp transmission member 3212 can be displaced relative to the second moving component 322 by the avoiding unit 324.

In this embodiment, the avoiding unit 324 includes a swing plate 3241 assembled to the first moving jig driving source 3211, an assembling plate 3242 assembled to the second moving assembly 322, and a roller 3243 assembled to the fixed frame 14, the swing plate 3241 is pivotally connected to the assembling plate 3242, so that the swing plate 3241 can swing with respect to the assembling plate 3242, the assembling plate 3242 is recessed to form an arc-shaped guide rail 3242a with a lower center, and the arc-shaped guide rail 3242a contacts with a guide wheel 3244 connected to the first jig driving member 3212, wherein a retainer 3245 provided as a spring is provided between the swing plate 3241 and the assembling plate 3242, the retainer 3245 is pressed by the swing plate 3241 and the assembling plate 3242 together to generate a holding force 3245a acting on the swing plate 3241, so that the swing plate 3241 swings with respect to the assembling plate 3242 by the holding force 3245a, and the guide wheel 3244 moves toward the arc-shaped guide rail 3242a, so that the guide wheel 3244 can be continuously contacted to the arc-shaped guide rail 3242a by the holding force 3245a of the holder 3245.

As shown in the figure, the second moving assembly 322 has a second moving clamp driving source 3221 capable of performing two moving strokes and a second clamp driving member 3222 connected to the second moving clamp driving source 3221, the second moving clamp driving source 3221 is assembled to the fixing frame 14 of the sewing machine body 10, and the second clamp driving member 3222 is connected to the assembling plate 3242 of the second moving member 322, so that, when the second moving clamp driving source 3221 drives the second clamp driving member 3222 to move, the first moving component 321 is driven by the second clamp driving member 3222 to move integrally, in addition, the clamp assembly 323 has a movable clamp 3231 pivotally connected to the first clamp actuator 3212 and a fixed clamp 3232 fixed to the first clamp actuator 3212, and the movable clamp 3231 is driven by a clamp driving source 3233 installed on the first clamp actuator 3212 to enable the end of the movable clamp 3231 to selectively approach or separate from the end of the fixed clamp 3232 (as shown in fig. 16A).

As shown in fig. 9, the end of the movable clamp 3231 has a clamping groove 3231a, and the end of the fixed clamp 3232 has a clamping block 3232a with a volume smaller than that of the clamping groove 3231a, as shown in the figure, when the movable clamp 3231 is driven by the clamp driving source 3233 to swing, the movable clamp 3231 is close to the fixed clamp 3232, so that the clamping block 3232a penetrates into the clamping groove 3231a, and the clamping block 3232a and the clamping groove 3231a are in a tight fit state, in this embodiment, the movable clamp 3231 has a blocking pin 3231b in the middle of the clamping groove 3231a, and the fixed clamp 3232 is recessed from the clamping block 3232a to form a pin hole 3232b, and when the clamping block 3232a and the clamping groove 3231a are in a tight fit state, the blocking pin 3231b penetrates into the pin hole 3232 b.

Referring to fig. 5 and 10, the wire clamping releasing mechanism 33 has a releasing lever 331 and a releasing driving source 332, the releasing lever 331 has a pivot portion 3311 pivotally connected to the fixing frame 14, and forms a pushing portion 3312 spaced apart from the connecting pad 3112a and an acting portion 3313 connected to the releasing driving source 332 at two ends of the pivot portion 3311, a clamping space 3314 (as shown in fig. 7) is provided between the blade portion 3112c of the blade 3112b and the connecting pad 3112a, wherein the releasing driving source 332 can generate power to drive the acting portion 3313 to move, so that the releasing lever 331 swings around the pivot portion 3311, the pushing portion 3312 can selectively approach or move away from the rear side of the connecting pad 3112a, the pushing portion 3312 pushes against the lower end of the connecting portion 3112d of the blade 3112b, and the blade portion 3312 c moves away from the connecting pad 3112a to open the clamping space 3314 for the bottom wire 60 to enter, in addition, as shown in fig. 5 and fig. 11, the bobbin thread controlling mechanism 34 is located between the bobbin set moving mechanism 31 and the thread clamping device 15, and has an adjusting member 341 and an adjusting driving source 342, the adjusting member 341 has a pivot axis 3411 pivotally connected to the fixing frame 14, one end of the pivot axis 3411 has an adjusting plate 3412 and a connecting post 3413, wherein a partial region of the adjusting plate 3412 penetrates through a through hole 3412a, and the connecting post 3413 is connected to the adjusting driving source 342, wherein the adjusting driving source 342 can generate power to drive the adjusting member 341 to swing around the axis of the pivot axis 3411.

Referring to fig. 12, the remaining bobbin thread removing device 40 is located at one side of the bobbin set rotating assembly 25, and has a movable mechanism 41, a thread cutting mechanism 42 and a suction mechanism 43, the movable mechanism 41 has a movable driving source 411 assembled to the fixed frame 14 and a movable arm 412 pivotally connected to the fixed frame 14, the movable driving source 411 is connected to the movable arm 412 and can drive the movable arm 412 to move and swing, the thread cutting mechanism 42 has a thread cutting driving source 421 assembled to the movable arm 412 and a cutter 422 driven by the thread cutting driving source 421, the thread cutting driving source 421 is assembled to a thread cutting transmission member 423 connected to the cutter 422, wherein the thread cutting driving source 421 can drive the cutter 422 to rotate via the thread cutting transmission member 423, and the cutter 422 is located above the bobbin set moving mechanism 31, as shown in the figure, the suction mechanism 43 is connected to the movable arm 412 and has a suction opening 431, and the suction mechanism 43 can create a suction air flow a (as shown in fig. 15B).

Referring to fig. 13, the bobbin 51 of the bobbin set 50 is mounted on the first transmission member 3112 of the first motion member 311, and a positioning mechanism 44 is disposed between the bobbin 51 and the first transmission member 3112, the positioning mechanism 44 can limit the penetrating space 514 of the bobbin 51 to be located right above the bobbin 51 when the bobbin 51 is assembled on the first transmission member 3112, so that the penetrating space 514 is close to the cutter 422 of the thread cutting mechanism 42, as shown in the figure, the positioning mechanism 44 has a guiding member 441 and a positioning member 442, the guiding member 441 is provided with two magnets 4411, and the positioning member 442 is provided with a protrusion 4421 and a positioning groove 4422 which can be engaged with each other, as shown in the figure, the two magnets 4411 are respectively assembled on the bobbin 51 and the first transmission member 3112, in addition, the protrusion 4421 is formed on the first transmission member 3112, and the positioning groove 4422 is formed on the bobbin 51, wherein when the bobbin 51 is assembled on the first transmission member 3112, the bobbin 51 may be in a free state, subsequently, the first transmission member 3112 drives the bobbin 51 to rotate, so that the two magnets 4411 are magnetically attracted to each other to draw the relative position between the bobbin 51 and the first transmission member 3112, and the protrusion 4421 is engaged with the positioning groove 4422 to limit the relative angular position between the bobbin 51 and the first transmission member 3112, so that the bobbin 51 cannot rotate relative to the first transmission member 3112, and when the first transmission member 3112 stops rotating and performs angular positioning, the penetration space 514 can be located right above the bobbin 51 to correspond to the cutter 422.

Referring to fig. 14A, in a specific application, the rotating hook 12 of the sewing machine body 10 and the bobbin set moving mechanism 31 of the lower thread guiding device 30 are respectively assembled with a bobbin set 50 wound by a lower thread 60, so that the bobbin set 50 assembled with the rotating hook 12 is set as a first bobbin set 501, the bobbin set 50 assembled to the bobbin set moving mechanism 31 is set as a second bobbin set 502, further, the lower thread 60 provided on the sewing machine body 10 is assembled to the thread tension device 15 of the sewing machine body 10, the bobbin thread 60 provided on the sewing machine body 10 is passed through the through hole 3412a of the bobbin thread controlling mechanism 34, so that a partial section of the bobbin thread 60 provided on the sewing machine body 10 can be positioned inside the clamping space 3314 of the thread clamping and releasing mechanism 33, further, the blade portion 3112c of the blade 3112b and the land 3112a of the first transmission member 3112 are clamped to the bobbin thread 60 provided in the sewing machine body 10.

Referring to fig. 14B, when the sewing machine body 10 performs the sewing operation to make the remaining amount of the bobbin thread 60 of the first bobbin set 501 nearly exhausted, the moving driving source 211 of the bobbin set moving assembly 21 generates moving power to move the entire bobbin set moving assembly 21 along the transmission rod 212 to be close to the rotary hook 12, so that the movable frame 22 drives the first and

second gripper assemblies

23 and 24 to be close to the rotary hook 12 of the sewing machine body 10 and the bobbin set moving mechanism 31 of the bobbin thread introducing device 30, respectively.

Referring to fig. 14C and 14D, when the first and second clamping jaw assemblies 23 and 24 are close to the rotating shuttle 12 of the sewing machine body 10 and the bobbin set moving mechanism 31 of the bobbin thread guiding device 30, respectively, the first fixed clamping jaw 232 of the first clamping jaw assembly 23 contacts the bobbin case 52 of the first bobbin set 501, and the second fixed clamping jaw 242 of the second clamping jaw assembly 24 contacts the bobbin case 52 of the second bobbin set 502, then the first clamping jaw driver 234 drives the first movable clamping jaw 233 to swing, so that the first clamping part 233a of the first movable clamping jaw 233 is close to the second fixed clamping jaw 242, and the first clamping part 233a is fastened to the latch clamping piece 3151b disposed on the first bobbin set 501, thereby the first movable clamping jaw 233 and the first fixed clamping jaw 232 are clamped to the first bobbin set 243 together, and at the same time, the second clamping jaw driver 244 drives the second movable clamping jaw to swing, so that the second clamping part a of the second movable clamping jaw is close to the second fixed clamping jaw 242, the second clamping portion 243a is further fastened to the latch clamping member 3151b of the second bobbin set 502, so that the second movable clamping jaw 243 and the second fixed clamping jaw 242 are clamped to the second bobbin set 502 together.

Referring to fig. 14E and 14F, when the first gripper assembly 23 and the second gripper assembly 24 are clamped to the first bobbin set 501 and the second bobbin set 502 respectively, the moving driving source 211 of the bobbin set moving assembly 21 generates moving power to move the bobbin set moving assembly 21 along the transmission rod 212 to move away from the rotary shuttle 12, so that the first gripper assembly 23 drives the first bobbin set 501 to move away from the rotary shuttle 12 of the sewing machine body 10, and the second gripper assembly 24 drives the second bobbin set 502 to move away from the bobbin set moving mechanism 31 of the bobbin thread introducing device 30, so that the first gripper assembly 23 can separate the first bobbin set 501 from the rotary shuttle 12 through the bobbin set moving assembly 21, and the second gripper assembly 24 can separate the second bobbin set 502 from the bobbin set moving mechanism 31 through the bobbin set moving assembly 21.

Then, the rotation driving source 251 of the bobbin set rotating assembly 25 can generate rotation power, so that the first transmission gear 252a of the transmission set 252 and the second transmission gear 252b of the transmission set 252 drive the transmission rod 212 of the bobbin set moving assembly 21 to rotate, so that the rotating transmission rod 212 drives the movable frame 22 to rotate clockwise along the arrow direction in the drawing, so that the second bobbin set 502 is located right in front of the rotary shuttle 12.

Referring to fig. 14G and 14H, the moving driving source 211 of the bobbin set moving assembly 21 generates moving power again, so that the moving driving source 211 drives the movable frame 22 to be close to the rotary shuttle 12 of the sewing machine body 10 along the transmission rod 212, so that the second bobbin set 502 is mounted on the rotary shuttle 12, and then the second clamping jaw driver 244 of the second clamping jaw assembly 24 drives the second clamping portion 243a of the second movable clamping jaw 243 to be away from the latch clamping member 3151b, so that the second bobbin set 502 is reliably assembled on the rotary shuttle 12, and at this time, the first clamping jaw assembly 23 still clamps the first bobbin set 501.

Referring to fig. 14I, 14J and 14K, when the second bobbin set 502 is assembled to the rotary shuttle 12, the movable frame 22 of the bobbin replacing device 20 is driven by the bobbin set moving assembly 21 and the bobbin set rotating assembly 25 to make the first clamping jaw assembly 23 approach to the bobbin set moving mechanism 31 of the guiding device, so that the first bobbin set 501 can be installed on the bobbin set moving mechanism 31, wherein when the first bobbin set 501 can be installed on the bobbin set moving mechanism 31, the third driving element 3132 of the third moving assembly 313 penetrates through the bobbin 522 of the first bobbin set 501, so that the positioning protrusion 3152a of the position limiting assembly 315 penetrates into the positioning groove 3152b of the position limiting assembly 315 to limit the bobbin case 52 of the first bobbin set 501 from rotating around the moving axis L.

As shown in the figure, when the positioning protrusion 3152a of the limiting assembly 315 penetrates into the positioning groove 3152b of the limiting assembly 315 to be engaged with each other, the first jaw driver 234 of the first jaw assembly 23 drives the first clamp portion 233a of the first movable jaw 233 to be away from the latch clamp 3151b disposed on the first bobbin set 501, and the latch clamp 3151b disposed on the first bobbin set 501 rebounds to make the latch 3151c snap into the annular groove 3151a of the limiting assembly 315 to limit the second bobbin set 502 from moving along the moving axis L.

Then, the moving driving source 211 of the bobbin set moving assembly 21 generates moving power to drive the movable frame 22 to move away from the rotating shuttle 12, and at this time, both the first gripper assembly 23 and the second gripper assembly 24 do not grip the first bobbin set 501 and the second bobbin set 502 respectively, so that both the first gripper assembly 23 and the second gripper assembly 24 wait for the next operation of gripping the bobbin set 50.

Referring to fig. 14L, when the first bobbin set 501 can be mounted on the bobbin set moving mechanism 31, the bobbin 51 of the first bobbin set 501 is close to the connecting plate 3112a of the first transmission member 3112, at this time, the bobbin 51 may be in a free state capable of freely rotating, then, the first transmission member 3112 drives the bobbin 51 to rotate clockwise, so that the guiding members 441 provided with two magnets 4411 are magnetically attracted to each other to allow the bobbin 51 of the first bobbin set 501 to rotate around the movement axis L, and the protrusion 4421 of the aligning mechanism 44 is engaged with the positioning groove 4422 of the aligning mechanism 44 to limit the relative angular position between the bobbin 51 of the first bobbin set 501 and the first transmission member 3112, and when the first transmission member 3112 stops rotating for several turns and is angularly positioned, the penetrating space 514 of the first bobbin set 501 can be located right above the winding shaft member 511, and further, when the first transmission member 3112 rotates, the bobbin 51 of the first bobbin set 50 can rotate by the first transmission member 3112, and the rotating bobbin 51 can wind back a part of the bobbin thread 60 between the housing 521 and the thread clamping elastic sheet 528 and a part of the bobbin thread 60 exposed out of the thread guiding hole 526 inside the bobbin case 52, so as to facilitate the subsequent thread cutting operation.

Referring to fig. 15A, when the bobbin set 50 is not clamped by both the first gripper assembly 23 and the second gripper assembly 24, the bobbin thread 60 remaining on the first bobbin set 501 begins to be removed, first, the third driving source 3131 of the third moving assembly 313 drives the third driving element 3132 of the third moving assembly 313 to move along the moving axis L, so that the synchronizing protrusion 3142 of the synchronizing assembly 314 moves toward the end of the synchronizing groove 3141, and the moving third driving element 3132 can drive the bobbin case 52 of the first bobbin set 501 to axially separate from the bobbin 51 of the first bobbin set 501, so that the bobbin case 52 of the first bobbin set 501 and the bobbin 51 of the first bobbin set 501 are separated from each other S1.

Referring to fig. 15B, next, the thread cutting driving source 421 of the thread cutting mechanism 42 drives the cutter 422 of the thread cutting mechanism 42 to rotate, the suction mechanism 43 starts to operate to form the suction air flow a, then the movable driving source 411 of the movable mechanism 41 drives the movable arm 412 of the movable mechanism 41 to swing, so that the thread cutting driving source 421, the cutter 422 and the suction mechanism 43 synchronously swing downwards, and the rotating cutter 422 moves to a cutting position C to cut off the remaining bobbin thread 60 inside the winding space 513, and when the bobbin thread 60 inside the winding space 513 is cut off by the cutter 422, the suction port 431 of the suction mechanism 43 is located at the side of the bobbin 51, so that the suction air flow a of the suction mechanism 43 can remove the bobbin thread 60 cut off by the cutter 422, as shown in the figure, since the aligning mechanism 44 can restrict the threading space 514 of the first bobbin set 501 from being located right above the shaft 511, when the cutting knife 422 is located at the cutting position C, the through space 514 can be aligned with the cutting knife 422 located at the cutting position C through the alignment mechanism 44, so that the cutting knife 422 can not only penetrate into the through space 514 to ensure that the cutting knife 422 can cut off the bobbin thread 60, but also ensure that the bobbin spool 511 cannot be interfered, next, the movable driving source 411 of the movable mechanism 41 drives the movable arm 412 of the movable mechanism 41 to swing upwards, so that the thread cutting driving source 421, the cutting knife 422 and the suction mechanism 43 are far away from the bobbin 51, wherein when the cutting knife 422 is just separated from the through space 514 of the bobbin 51, the first transmission piece 3112 of the first moving assembly 311 can drive the bobbin 51 to rotate to enhance the effect of the suction mechanism 43 to suck the residual bobbin thread 60, so that the bobbin 51 of the first bobbin set 501 is in the initial state S2 in which the bobbin thread 60 is not wound, and the operation of clearing the bobbin thread 60 is completed.

As shown in fig. 15C, the suction mechanism 43 is assembled to the movable arm 412 of the movable mechanism 41 for convenience of description, that is, the suction mechanism 43 may be assembled to the fixed frame 14 of the sewing machine body 10 such that the suction mechanism 43 does not swing along with the movable arm 412 when the movable arm 412 swings, as shown in the figure, the suction port 431 of the suction mechanism 43 is located below the bobbin 51, and the appearance of the suction port 431 is in a funnel shape, so that when the cutter 422 is located at the cutting position C to cut the bobbin thread 60, the suction mechanism 43 can receive the bobbin thread 60 which naturally falls after being cut by the cutter 422, and the bobbin thread 60 is carried away from the bobbin 51 by the suction air flow a.

Referring to fig. 15D, in the preferred embodiment, the thread cutting transmission member 423 of the thread cutting mechanism 42 is connected to an air pressure source (not shown) capable of generating an air flow, wherein the thread cutting transmission member 423 is provided with a plurality of air blowing holes 423a close to the cutter 422, so that when the cutter 422 is located at the cutting position C to cut the bottom thread 60, the air pressure source forms a blowing air flow B flowing out of the air blowing holes 423a to prevent the cut bottom thread 60 from winding around the thread cutting transmission member 423.

Referring to fig. 16A, after the bottom thread 60 is completely removed, the bottom thread 60 starts to be wound, first, the first driving source 3111 of the first moving assembly 311 generates a rotation power to drive the first driving pulley 3113a of the first linkage group 3113 to rotate, so that the first belt 3113c of the first linkage group 3113 drives the first transmission member 3112 to rotate around the movement axis L via the first driven pulley 3113b of the first linkage group 3113, and further the bottom thread 60 in the clamping space 3314 starts to rotate along with the first transmission member 3112, so that the bobbin 51 of the first bobbin group 501 rotates synchronously to bring the bottom thread 60 into the winding space 513 of the bobbin 51.

When the bobbin 51 of the first bobbin set 501 winds the bobbin thread 60 initially, since the outer diameter of the first winding part 511a of the first bobbin set 501 is smaller than the outer diameter of the second winding part 511b of the first bobbin set 501, the bobbin thread 60 is wound around the first winding part 511a of the bobbin 51 first to ensure that the bobbin thread 60 covers the penetration space 514 of the first bobbin set 501 first, and further the bobbin thread 60 remaining after the bobbin 51 of the first bobbin set 501 passes through the sewing operation remains at the first winding part 511a, so that the bobbin thread 60 can be cut off reliably when the cutter 422 of the thread cutting mechanism 42 is located at the cutting position C, in the preferred embodiment, in order to further ensure that the bobbin thread 60 winds around the first winding part 511a first in the initial stage of the winding operation, the adjustment driving source 342 of the bobbin thread control mechanism 34 drives the adjustment member 341 of the bobbin thread control mechanism 34 to swing, so that the through hole 3412a of the adjustment member 341 restricts the bobbin thread 60 from deflecting toward the connecting disc 3112a, when the bobbin thread 60 is wound around the first winding portion 511a for a certain number of turns (for example, 10 turns or 20 turns), the adjustment driving source 342 drives the adjustment member 341, so that the through hole 3412a does not limit the deviation of the bobbin thread 60, and the bobbin thread 60 is uniformly wound around the winding shaft member 511 of the bobbin 51, and when the bobbin thread 60 is wound around the first winding portion 511a for a certain number of turns (for example, 10 turns or 20 turns), the release driving source 332 of the thread clamping and releasing mechanism 33 drives the release lever 331 of the thread clamping and releasing mechanism 33 to swing, so that the pushing portion 3312 of the release lever 331 pushes against the lower end (as shown in fig. 16F) of the connecting portion 3112d of the blade 3112b to release the bobbin thread 60, the head of the bobbin thread 60 located in the clamping and releasing space 3314 is taken in the winding space 513 together, and then the release driving source 332 drives the pushing portion 3312 to be far away from the connecting plate 3112a, and the blade 3112c of the blade 3112b contacts the connecting plate 3112a by the blade 3112b through its own elasticity, next, when the bobbin 51 of the first bobbin set 501 winds the ground thread 60 for a predetermined number of turns, the winding space 513 of the first bobbin set 501 is fully wound with the ground thread 60, and at this time, the first driving source 3111 of the first moving assembly 311 stops rotating.

Referring to fig. 16B, after the bobbin thread 60 is stopped to be wound, since the relative position between the bobbin thread 60 and the clamping assembly 323 cannot be determined, the adjustment driving source 342 of the bobbin thread control mechanism 34 needs to drive the adjustment member 341 of the bobbin thread control mechanism 34 to swing around the pivot shaft 3411, so that the adjustment plate 3412 of the adjustment member 341 abuts against the bobbin thread 60 between the gripper 15 and the bobbin 51, and further the through hole 3412a of the adjustment plate 3412 restricts the bobbin thread 60 between the gripper 15 and the bobbin 51 from approaching the clamping assembly 323, thereby the clamping assembly 323 can secure the bobbin thread 60 clamped between the gripper 15 and the bobbin 51, and in order to achieve the above-mentioned effects, before the bobbin thread 60 is stopped to be wound, the adjustment driving source 342 is adjusted to drive the adjustment member 341 to swing, so that the adjustment plate 3412 abuts against the bobbin thread 60 between the gripper 15 and the bobbin 51, thereby limiting the under thread 60 between the gripper 15 and the bobbin 51 from approaching the gripper assembly 323, and allowing the under thread 60 finally wound on the bobbin 51 to be located on the operation path of the gripper assembly 323.

Referring to fig. 16C, the first moving clamp driving source 3211 of the first moving assembly 321 drives the first clamp driving element 3212 of the first moving assembly 321 to extend outward, and the clamp assembly 323 of the bobbin thread clamping mechanism 32 is driven by the first clamp driving element 3212 to move from a first preparation position P1 (shown in fig. 16A) to a clamping position P2 along a first path D1 (shown in fig. 16D) intersecting the moving axis L, so that the bobbin thread 60 between the bobbin 51 and the thread gripper 15 is located between the movable clamp 3231 and the fixed clamp 3232, in this embodiment, when the clamp assembly 323 moves from the first preparation position P1 to the clamping position P2, the guide wheel 44 of the guide unit 324 continuously contacts the arc-shaped guide rail 3242a of the assembly plate 3242 by the holding force 3245a of the holding element 3245, so that the guide wheel 3244 moves from one end of the arc-shaped guide rail 3242a to the other end of the arc-shaped guide rail 3242a, the swing plate 3241 of the avoiding unit 324 drives the first moving assembly 321 and the clamp assembly 323 to swing along a counterclockwise direction, so as to change the relative positions between the first moving clamp driving source 3211, the first clamp driving member 3212 and the clamp assembly 323 and the first bobbin set 501, so that the clamp assembly 323 can avoid the bobbin 51 of the first bobbin set 501, and thus, when the clamp assembly 323 moves along the first path D1 to the clamping position P2, the clamp assembly can avoid the bobbin 51 of the first bobbin set 501 through the avoiding unit 324, as shown in fig. 16D, when the clamp assembly 323 of the bobbin thread clamping mechanism 32 is located at the clamping position P2, the stop pin 3231b of the movable clamp 3231 abuts against the bobbin thread 60 located between the bobbin 51 and the gripper 15, so that when the bobbin thread 60 is in a loose state, the stop pin 3231b can limit the local length of the bobbin thread 60 to be located between the movable clamp 3231 and the fixed clamp 3232, and further, the relative position relationship between the bobbin thread 60 and the clamp assembly 323 when the clamp assembly 323 is clamped to the bobbin thread 60 can be ensured, and then, the clamp driving source 3233 of the clamp assembly 323 drives the movable clamp 3231 of the clamp assembly 323 to swing, so that the movable clamp 3231 approaches the fixed clamp 3232 of the clamp assembly 323, and further the movable clamp 3231 and the fixed clamp 3232 are clamped to the bobbin thread 60 between the bobbin 51 and the gripper 15 at a position close to the adjusting member 341, at this time, the clamping block 3232a of the fixed clamp 3231 moves into the clamping groove 3231a, and further both the clamping groove 3231a and the clamping block 3232a are in a tight state, so that the clamping groove 3231a and the clamping block 3232a are clamped to the bobbin thread 60 to prevent the bobbin thread 60 from being separated from the clamp assembly 323, and the clamping groove 3231a and the clamping block 3232a clamp a partial section of the bobbin thread 60 together, where the bobbin thread 60 is divided into a wound bobbin thread 61 between the bobbin thread 51 and the clamp assembly 323, while the remainder of the bobbin thread 60 is provided as a supply bobbin thread 62 assembled to the gripper 15.

Referring to fig. 16E and 16F, the first moving clamp driving source 3211 of the first moving assembly 321 drives the first clamp driving member 3212 of the first moving assembly 321 to contract inward, and the clamp assembly 323 of the bobbin thread clamping mechanism 32 is driven by the first clamp driving member 3212 to move from the clamping position P2 back to the first preparation position P1 along the first path D1, so that the bobbin thread 62 of the supply source passes under the bobbin 51 of the first bobbin set 501, at this time, the release driving source 332 of the thread clamping and releasing mechanism 33 drives the release lever 331 of the thread clamping and releasing mechanism 33 to swing, the pushing portion 2 of the release lever 331 pushes against the lower end of the connecting portion 3112D of the blade 3112b, the blade portion 3112 of the blade 3112b is far away from the connecting plate 3112a to drive the clamping space 3314 to assume the open state for the bobbin thread 60 to enter, and then the first driving source 3111 of the first moving assembly 311 drives the first driving member 3112 to rotate clockwise through the first group 3113, the source bobbin thread 62 is passed through the clamping space 3314, then the releasing drive source 332 drives the releasing lever 331 to swing, so that the pushing portion 3312 of the releasing lever 331 is far away from the lower end of the connecting portion 3112D of the blade 3112b, and the blade 3112b makes the blade portion 3112c of the blade 3112b and the connecting disc 3112a clamp the source bobbin thread 62 together by its own elastic force (as shown in fig. 16F) to wait for the next winding action of the bobbin thread 60, and then the second moving clamp drive source 3221 of the second moving assembly 322 drives the second clamp transmission member 3222 of the clamp assembly 323 to perform the first moving stroke, so that the first clamp assembly 323 and the clamp assembly 323 are both driven by the second clamp transmission member 3222 to move, so that the clamp assembly 323 is moved from the first preparation position P1 to a first guiding position P3 along a second path D2 intersecting the first path D1, when the clamp assembly 323 is located at the first guiding position P3, the supply bobbin thread 62 contacts the blade portion 3112c of the blade 3112b, and then as shown in fig. 16G and fig. 16H, the first driving source 3111 of the first moving assembly 311 drives the first transmission 3112 to rotate counterclockwise around the movement axis L through the first linkage group 3113, so that the blade 3112b is driven by the first transmission 3112 to cut off the supply bobbin thread 62, at this time, the thread end of the supply bobbin thread 62 is clamped by the blade 3112b, and the thread end of the winding bobbin thread 61 is clamped by the clamp assembly 323, in the above fig. 16A to fig. 16H, for convenience of description, the bobbin case 52 is axially moved away from the bobbin 51, actually, the relative distance between the bobbin case 52 and the bobbin 51 should be as shown in the separation state S1 of fig. 15A, and in fig. 16G, the bobbin 51 is moved out of the connection disc 3112a for the purpose of clearly showing the angle state of the blade 3112 b.

In the aforementioned steps of fig. 16A to 16E, in order to prevent the clamp assembly 323 from interfering with the connecting disc 3112a and the blade 3112b when the clamp assembly 323 moves along the first path D1, the first moving assembly 311 can drive the connecting disc 3112a and the blade 3112b to rotate, so that the blade 3112b can rotate to an angle avoiding the clamp assembly 323, but is not limited to the angle shown in the figure.

Referring to fig. 17A, after the bobbin thread 60 is cut, the bobbin thread 61 is mounted on the bobbin case 52 of the first bobbin set 501, first, the third driving source 3131 of the third motion assembly 313 drives the third linkage group 3133 to be away from the third driving element 3132, the restoring force 3134a of the restoring acting element 3134 acts on the pressing block 3132a, so that the third driving element 3132 moves toward the third driving source 3131, and the moving third driving element 3132 can drive the bobbin case 52 of the first bobbin set 501 to be assembled with the bobbin 51 of the first bobbin set 501, so that the bobbin case 52 of the first bobbin set 501 and the bobbin 51 of the first bobbin set 501 are changed from the separated state S1 to an assembled state S3, and at this time, the bobbin thread 61 contacts with the opening end 524 of the bobbin case 52, so that the bobbin thread 60 is tensioned.

Referring to fig. 17B, when the winding bobbin thread 60 contacts the open end 524 of the bobbin case 52, the second driving source 3121 of the second motion assembly 312 generates a rotation power to drive the second driving pulley 3123a of the second linkage group 3123 to rotate, so that the second belt 3123c of the second linkage group 3123 drives the second transmission member 3122 to rotate around the motion axis L via the second driven pulley 3123B of the second linkage group 3123, and when the second transmission member 3122 rotates, the synchronizing protrusion 3142 of the synchronizing assembly 314 is restricted by the synchronizing groove 3141 to be unable to move, so that the second transmission member 3122 drives the third transmission member 3132 of the third motion assembly 313 to rotate through the synchronizing assembly 314, and further the bobbin case 52 of the first bobbin set 501 rotates synchronously, as shown in the figure, the second driving source 3121 first drives the bobbin case 52 of the first bobbin set 501 to rotate clockwise through the second transmission member 3122, then, the second driving source 3121 drives the bobbin case 52 of the first bobbin set 501 to rotate counterclockwise, so that the rotating bobbin case 52 can guide the winding bottom thread 60 into the thread guiding groove 527 of the bobbin case 52, and the partial thread segment of the winding bottom thread 61 is located between the housing 521 of the bobbin case 52 and the thread clamping elastic piece 528 of the bobbin case 52.

Referring to fig. 17C, next, the second moving clamp driving source 3221 of the second moving assembly 322 drives the second clamp driving element 3222 of the clamp assembly 323 to perform a second moving stroke, so that the first clamp assembly 323 and the clamp assembly 323 are driven by the second clamp driving element 3222 to move in a direction away from the connecting plate 3112a, and the clamp assembly 323 is moved from the first guiding position P3 to a second preparation position P4 along a third path D3 parallel to the second path D2, as shown in fig. 17D, during the process that the clamp assembly 323 moves to the second preparation position P4, the first clamp driving element 3212 of the first moving assembly 321 contacts the roller 3243 of the avoiding unit 324, so that the swinging plate 3241 of the avoiding unit 324 swings, and the guiding wheel 3244 of the avoiding unit 324 is separated from the arc-shaped guide rail 3242a, whereby the clamp assembly 323 of the bottom wire clamping mechanism 32 pulls the winding bottom wire 61, the winding bobbin thread 61 is guided into the guiding opening 528a of the thread clamping spring 528, and the thread clamping spring 528 can guide the winding bobbin thread 61 from the thread guiding groove 527 to the thread guiding hole 526.

Referring to fig. 17E, when the clamp assembly 323 is located at the second preparation position P4, the first moving clamp driving source 3211 of the first moving assembly 321 drives the first clamp driving member 3212 of the first moving assembly 321 to extend outward again, so that the first clamp driving member 3212 drives the clamp assembly 323 to move from the second preparation position P4 to a second guiding position P5 along a fourth path D4 parallel to the first path D1, wherein during the movement of the clamp assembly 323 to the second guiding position P5, the winding bobbin thread 61 first contacts the hook arm 529 of the shuttle case 52, and then the winding bobbin thread 61 pushes the spring arm 530a of the thread piece 530 to deform the spring arm 530a, so that the winding bobbin thread 61 is guided into the thread hole 529a of the hook arm 529, thereby completing the operation of installing the winding bobbin thread 61 in the shuttle case 52, wherein when the winding bobbin thread 61 is located in the thread hole 529a, the spring arm 530a is not pushed into the thread hole 529a, so that the winding bobbin thread 61 is stopped by the elastic arm 530a to be prevented from coming out of the thread hole 519 a.

Referring to fig. 17F, the bobbin thread 61 is guided into the thread hole 529a of the hook arm 529, the clamp driving source 3233 of the clamp assembly 323 swings the movable clamp 3231 of the clamping assembly to move the movable clamp 3231 away from the fixed clamp 3232 of the clamp assembly 323, so that the clamp assembly 323 releases the thread end of the bobbin thread 61, and finally, the clamp assembly 323 moves back from the second guiding position P5 to the first standby position P1 by the first moving assembly 321 and the second moving assembly 322, so that the clamp assembly 323 waits for the bobbin thread 60 to be mounted on the bobbin case 52.

Referring to fig. 18, in the second preferred embodiment, the difference from the first preferred embodiment lies in the assembly manner among the first moving component 311, the second moving component 312, the third moving component 313 and the synchronizing component 314, as shown in the figure, the second transmission member 3122 of the second moving component 312 movably penetrates through the first transmission member 3112 of the first moving component 311, the second linkage group 3123 of the second moving component 312 is a single hollow shaft, the third transmission member 3132 is movably assembled on the outer circumference of the second linkage group 3123 and assembled on the second transmission member 3122 through the synchronizing protrusion 3142 of the synchronizing component 314, wherein the first transmission member 3133112 and the third transmission member 3132 are respectively located on two opposite sides of the second transmission member 3122, in addition, the third linkage group 3133 of the third moving component 313 is provided with a linkage rack 3133a capable of driving the third transmission member 3132 to axially displace and a set of gears 3133b mounted on the third driving source 3131, the linkage rack 3133a is meshed with the linkage gear 3133b, wherein the synchronization groove 3141 of the synchronization module 314 is formed in the second linkage group 3123, such that the synchronization groove 3141 is in a long strip shape, and the synchronization protrusion 3142 is simultaneously inserted into the third transmission member 3132, the second linkage group 3123, and the second transmission member 3122.

In this embodiment, when the second driving source 3121 of the second motion assembly 312 generates a rotation power, the second driving source 3121 drives the second transmission member 3122 to rotate relative to the first transmission member 3112, at this time, the synchronizing protrusion 3142 of the synchronizing assembly 314 is not affected by the first transmission member 3112 to rotate, the synchronous groove 3141 of the synchronous component 314 synchronously rotates with the second transmission member 3122, and in addition, the third driving source 3131 of the third moving component 313 generates a rotating power, the interlocking gear 3133b of the third interlocking group 3133 drives the interlocking rack 3133a of the third interlocking group 3133 to move, so that the third transmission member 3132 moves along the moving axis L, when the third driving element 3132 moves, the synchronization protrusion 3142 of the synchronization element 314 moves along the synchronization groove 3141 of the synchronization element 314, so that the third transmission element 3132 drives the second transmission element 3122 to perform axial movement integrally through the synchronization assembly 314.

Referring to fig. 19, in the third preferred embodiment, the difference from the second preferred embodiment is that the bobbin set moving mechanism 31 has no synchronizing member 314 and the third driving element 3132 of the third moving member 313 is configured as a plate member and assembled to the second driving source 3121 of the second moving member 312, so that the third driving element 3132 is not coaxially disposed on the moving axis L, wherein, when the third driving source 3131 of the third motion assembly 313 drives the third transmission piece 3132 to move along the axial direction of the motion axis L, the whole second motion assembly 312 (including the second driving source 3121, the second transmission piece 3122 and the second linkage 3123) moves along simultaneously, so that the bobbin case 52 moves to be separated from the bobbin 51, in this embodiment, the third actuator 3132 can be directly connected to the third driving source 3131, however, the third actuator 3132 may be connected to the third driving source 3131 via the third linkage group 3133.

However, the third actuator 3132 is assembled to the second driving source 3121 for convenience, that is, the third actuator 3132 can be assembled to the first driving source 3111 of the first moving component 311, and when the third actuator 3132 moves along the axial direction of the moving axis L by the third driving source 3131, the whole first moving component 311 (including the first driving source 3111, the first actuator 3112 and the first linkage 3113) can move along the moving axis L at the same time, so that the bobbin 51 moves to be separated from the bobbin case 52.

In addition, in this embodiment, before the bobbin thread 60 is wound around the bobbin 51, the clamp component 323 of the bobbin thread clamping mechanism 32 can temporarily clamp the supply source bobbin thread 62, and then the release driving source 332 of the thread clamping release mechanism 33 drives the release lever 331 of the thread clamping release mechanism 33 to swing, so that the pushing portion 3312 of the release lever 331 pushes against the lower end of the connecting portion 3112d of the blade 3112b, and the blade portion 3112 of the blade 3112b is away from the connecting plate 3112a to open the clamping space 3114, and then the clamp component 323 is driven by the first moving component 321 and the second moving component 322 to temporarily separate the supply source bobbin thread 62 from the clamping space 3314, whereby, during the process of removing the bobbin thread 60, since the supply source bobbin thread 62 is temporarily separated from the clamping space 3314, the excessive bobbin thread 60 can be prevented from being pulled out from the thread clamping device 33115 during the rotation of the first moving component 3112, and then, after the removal of the bobbin thread 60 is completed, the first and second moving components 321 and 322 drive the clamp component 323 to move, so that the source bobbin thread 62 returns to the inside of the clamping space 3314, and then the release driving source 332 drives the release lever 331 to swing, so that the pushing portion 3312 of the release lever 331 is far away from the lower end of the connecting portion 3112d of the blade 3112b, and the blade 3112b makes the blade portion 3112c of the blade 3112b and the connecting disc 3112a clamp the source bobbin thread 62 together by its own elastic force.

The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A residual bobbin thread removing device used in cooperation with a bobbin provided with a winding space, comprising:

the thread cutting mechanism is provided with a cutter which can cut off a bottom thread positioned in the winding space; and

and the movable mechanism is provided with a movable arm capable of changing the position, and the movable arm can drive the cutter to move to the inside of the winding space, so that the cutter is positioned at a cutting position to cut off the bottom line positioned in the winding space.

2. The residual bobbin thread removing device according to claim 1, wherein: the bobbin thread cutting mechanism also has a suction mechanism which can form a suction air flow in the winding space to remove the bobbin thread cut by the cutter, so that the bobbin core is in an initial state of not winding the bobbin thread.

3. The residual bobbin thread removing device according to claim 1, wherein: the thread cutting mechanism is also provided with a thread cutting driving source which can drive the cutter to rotate, the thread cutting driving source is connected with the movable arm, and the movable arm drives the cutter to move to the cutting position in the process of synchronous movement.

4. The residual bobbin thread removing device according to claim 3, wherein: the tangent driving source is assembled with a tangent transmission part connected with the cutter, the tangent transmission part is provided with an air blowing hole, and the air blowing hole can flow out a blown air flow.

5. The residual bobbin thread removing device according to claim 1, wherein: the shuttle peg is provided with a penetrating space formed by recessing from the surface profile of the shuttle peg, the penetrating space is communicated with the winding space and is used for accommodating a part of the cutter when the cutter is positioned at the cutting position.

6. The residual bobbin thread removing device according to claim 5, wherein: the bobbin is provided with two limiting plates which are arranged at intervals and a winding shaft piece which is positioned between the two limiting plates, the winding space is formed between the two limiting plates and the winding shaft piece, one of the two limiting plates and the winding shaft piece are respectively concavely arranged to form a limiting groove and a shaft piece groove, and the limiting groove is communicated with the shaft piece groove, so that the limiting groove and the shaft piece groove form the penetrating space together.

7. The residual bobbin thread removing device according to claim 5, wherein: the residual bottom thread removing device is also provided with an alignment mechanism, the alignment mechanism is connected between the shuttle peg and a transmission piece, and when the shuttle peg is assembled in the transmission piece, the alignment mechanism can align the penetrating space with the cutter positioned at the cutting position, so that the cutter can penetrate into the penetrating space.

8. The residual bobbin thread removing device according to claim 7, wherein: the alignment mechanism is provided with a guide assembly, and the guide assembly can change the relative position between the shuttle peg and the transmission member, so that the penetrating space can be close to the cutter positioned at the cutting-off position.

9. The residual bobbin thread removing device according to claim 8, wherein: the alignment mechanism is also provided with a positioning component, and when the penetrating space is close to the cutter positioned at the cutting position through the guide component, the positioning component can limit the relative position between the shuttle peg and the transmission component, so that the shuttle peg cannot move relative to the transmission component.

10. The residual bobbin thread removing device according to claim 1, wherein: the bobbin is assembled in a bobbin case, the bobbin case is provided with a thread clamping elastic sheet and can be driven to rotate, and the rotating bobbin can wind back the bottom thread between the bobbin case and the thread clamping elastic sheet in the bobbin case.

11. A sewing machine having a residual bobbin thread removing device according to any one of claims 1 to 10, used in cooperation with a bobbin provided with a winding space, characterized in that:

a sewing machine body having a rotating shuttle; and