CN214193701U - Independent operation bottom line mechanism of separated sewing machine - Google Patents

Abstract

The application provides a disconnect-type flush joint machine's independent operation bobbin thread mechanism, concretely relates to flush joint machine makes technical field. The flat sewing machine is provided with a thread feeding mechanism, a bottom thread mechanism and a bedplate, and is characterized in that the bottom thread mechanism is not in mechanical transmission connection with a spindle motor of the thread feeding mechanism, the bottom thread mechanism is provided with a cloth feeding tooth assembly, a rotating shuttle assembly and a thread cutting assembly which are assembled and installed on a fixed seat, the fixed seat is installed below the bedplate, the thread feeding mechanism is provided with a thread picking assembly, and a thread collecting column is fixedly arranged at the eccentric position of the thread picking assembly provided with a thread collecting disc. The application cancels the traditional vertical linkage mechanical transmission structure, realizes the oilless work of the flat seamer without lubrication, and the bottom thread mechanism can be manufactured into a modularized matching to be used on various flat seamers. The bottom line mechanism has the advantages of high practicability and strong universality, and subversive technical reform is made on the structure and mechanical transmission.

Description

Independent operation bottom line mechanism of separated sewing machine

Technical Field

The application provides a disconnect-type flush joint machine's independent operation bobbin thread mechanism, concretely relates to flush joint machine makes technical field.

Background

A flat sewing machine is a sewing device for sewing clothes, bags, shoes, hats, quilts and the like. A main shaft motor of the traditional flat sewing machine is connected with an upper main shaft, and the main shaft motor drives the upper main shaft to rotate so as to drive an eccentric rotating wheel, a conical gear and a needle rod crankshaft which are fixedly connected with the upper main shaft to rotate simultaneously. In the bottom thread sewing transmission mechanism, the eccentric rotating wheel simultaneously drives the cloth feeding connecting rod and the feed lifting tooth connecting rod to operate, the cloth feeding connecting rod drives the cloth feeding shaft to operate through the swinging seat assembly, and the feed lifting tooth connecting rod drives the feed lifting tooth shaft to swing through the feed lifting tooth crank; the swing of the feed shaft drives the tooth frame fixedly connected to the feed shaft to swing in a direction similar to the horizontal direction, the swing of the feed lifting shaft drives the feed lifting fork fixedly connected to the feed lifting shaft to swing in a direction similar to the vertical direction, and the obtained feed lifting tooth is combined with the swing in the horizontal front-back direction and the swing in the vertical up-down direction to form a feed lifting tooth running track. Meanwhile, the bevel gear is connected with a vertical shaft in the vertical direction, the vertical shaft transmits torque to the lower shaft, and the lower shaft is connected with the rotating shuttle and can improve the rotating speed by 2 times by changing the size of the gear to operate the rotating shuttle.

In conclusion, the sewing process of the flat sewing machine is actually a sewing process in which a spindle motor drives an eccentric rotating wheel, a bevel gear and a needle bar crankshaft on a spindle to realize the cooperative cloth feeding of a cloth feeding tooth, a presser foot and a machine needle, and a rotating shuttle is matched with the sewing process. The traditional vertical linkage transmission mechanism of the flat sewing machine is complex, on one hand, the noise of the flat sewing machine is caused, on the other hand, the requirements on the manufacturing standard of mechanical transmission parts of the flat sewing machine are higher, and particularly, the requirements on a rotating shuttle playing a key role in sewing an off-line outgoing line are higher. Since the existence of the traditional mechanical transmission structure of the lockstitch sewing machine, a feasible scheme is needed to improve the transmission efficiency of the lockstitch sewing machine so as to overcome the technical defects, and simultaneously, the manufacturing difficulty of the lockstitch sewing machine, the manufacturing cost of the lockstitch sewing machine and the intelligent control level of the lockstitch sewing machine can be reduced.

Disclosure of Invention

The split flat sewing machine is high in transmission efficiency and low in manufacturing difficulty, and is provided with a thread feeding mechanism, a bottom thread mechanism and a bedplate.

The presser foot lifting component is provided with a presser foot lifting driving source which drives a presser foot lifting grooved pulley which causes the presser foot lifting ejector rod to move up and down to execute the presser foot lifting action; a take-up column is fixedly arranged at the eccentric position of a take-up reel of the take-up assembly, and the take-up action is executed by the change of the position of the take-up column under the circumferential operation of the take-up reel; the cloth feeding tooth assembly is provided with an up-down lifting motor and a front-back cloth feeding motor which apply a non-lateral swinging source to the cloth feeding tooth, and the up-down lifting motor and the front-back cloth feeding motor indirectly act on the cloth feeding tooth to perform cloth feeding action; the rotating shuttle assembly is provided with a suspended rotating shuttle which is placed in a rotating shuttle fixing seat, and the rotating shuttle fixing seat is connected with an anti-slip cover plate and abuts against the suspended rotating shuttle; the thread cutting push rod of the rotating shuttle component is pushed by the thread cutting driving source and moves, and the thread cutting push rod is pushed by the bottom thread driving source of the rotating shuttle component and rotates to execute thread cutting action. The sewing action of the bottom thread mechanism is realized by arranging the presser foot lifting component and the thread taking-up component of the thread feeding mechanism and the brand new three components of the feed dog component, the rotating shuttle component and the thread cutting component of the bottom thread mechanism, so that the oilless sewing without lubrication of the flat sewing machine is realized.

Preferably, the power output end of the presser foot lifting driving source is connected with a presser foot lifting grooved pulley, a groove of the presser foot lifting grooved pulley rotates back and forth along with the presser foot lifting driving source to replace the abutting position of a presser foot lifting ejector rod, the presser foot lifting driving source is installed on the base, the presser foot lifting ejector rod is arranged in the machine head in a penetrating mode, and the presser foot lifting ejector rod is connected with a presser foot lifting tail end execution end.

Preferably, the thread take-up post is provided with a thread pulling groove, a sewing upper thread is sleeved on the thread pulling groove and is led onto the thread take-up post from a position between a first thread clamping device and a second thread clamping device which are arranged on the thread take-up assembly.

Preferably, the take-up reel and the take-up auxiliary are connected by a take-up rotating shaft, the rotation of the take-up auxiliary is from a main shaft motor of the lockstitch sewing machine to drive a needle rod to push up and down, the needle rod is connected with the take-up auxiliary by a take-up connecting rod, and the take-up connecting rod is connected to an eccentric position of the take-up auxiliary.

Preferably, the output shafts at the two ends of the up-down lifting motor are respectively provided with a first feed lifting cam and a second feed lifting cam, the first feed lifting cam and the second feed lifting cam respectively act on two lugs at the bottom of a support frame of the feed delivery mechanism, and the up-down lifting motor is fixed on a bottom plate of the lockstitch sewing machine.

Preferably, the front and rear cloth feeding motors drive the rotary disc to drive the connecting rod, the connecting rod is movably connected to the eccentric position of the rotary disc, the connecting rod is movably connected with the cloth feeding tooth connecting frame, the copper sleeve swinging rod and the driving end swinging rod which are arranged at two ends of the cloth feeding tooth connecting frame are respectively arranged on the fixed copper sleeves which are arranged at two ends of the supporting frame, the cloth feeding teeth are connected above the cloth feeding tooth connecting frame, the front and rear cloth feeding motors are fixed on the upper portion of the supporting frame which is arranged on the flat sewing machine, and the output shafts of the front and rear cloth feeding motors are provided with the back and forth swinging devices.

Preferably, the front side and the rear side of the support frame are respectively provided with a support rod, the front position and the rear position of the up-down lifting motor fixed on the bottom plate are respectively provided with a support, and a groove arranged at the top of the support is used for supporting the support rods.

Preferably, the rotating shuttle fixing seat is stationary and fixed during sewing, a sliding line gap and a positioning device are arranged between the suspension rotating shuttle and the rotating shuttle fixing seat, and a sliding line gap is arranged between the suspension rotating shuttle and the anti-slip cover plate; the utility model discloses a suspension rotating shuttle, including suspension rotating shuttle, line frame has been placed to suspension rotating shuttle inside, the well idle shaft drive crochet hook that the bottom line driving source had colludes the last line of making up of machine needle and the line frame in the suspension rotating shuttle down make up the line and form the noose, the crochet hook and the cavity pivot fixed connection of bottom line driving source, the cavity pivot cover of bottom line driving source establish with the fixed lever that the rotating shuttle fixed seat has on, crochet hook orbit sets up with the dead lever is concentric to the dead lever sets up with the line frame is concentric.

Preferably, the thread trimming driving source pushes the thread trimming push rod, a push block arranged at the front end of the thread trimming push rod reaches a notch arranged in the hollow rotating shaft, a middle idle shaft arranged on the bobbin thread driving source drives the thread trimming push rod to rotate, and the tail end execution assembly of the thread trimming assembly executes thread trimming actions.

Preferably, the trimming push rod generates thrust for the secondary push rod and the primary push rod, so that the primary push rod and the push rod rest are respectively connected with the primary knife and the secondary knife, the primary push rod and the push rod rest push the primary knife and the secondary knife in opposite directions, the primary knife and the secondary knife are pushed to complete trimming, and an elastic part is further arranged between the trimming driving source support of the trimming assembly and the trimming push rod.

The application provides a disconnect-type flush joint machine's independent operation bobbin thread mechanism has cancelled traditional linkage mechanical transmission structure from top to bottom, has realized the oilless work that the flush joint machine need not lubricate, makes the separation on mechanical transmission with last line mechanism and bobbin thread mechanism ingeniously, and bobbin thread mechanism can make into the modularization supporting and use on various flush joint machines. The split type lockstitch sewing machine improves the transmission efficiency to the maximum extent, further realizes the intelligent control of sewing, has the advantages of high practicability and strong universality of the bottom line mechanism, and makes subversive technical reform on the structure and mechanical transmission, so that the mechanical structure is simplified, the sewing transmission efficiency is higher, and the split type lockstitch sewing machine has epoch-making technical innovation in the lockstitch sewing machine industry.

Drawings

FIG. 1 is a schematic structural view of an independently operating bobbin thread mechanism of a split bed sewing machine of the present application;

FIG. 2 is a bottom thread mechanism configuration view of the independently operating bottom thread mechanism of a split lockstitch sewing machine of the present application;

FIG. 3 is a schematic view of a feed dog assembly of an independently operating feed mechanism of a split lockstitch machine of the present application;

FIG. 4 is a feed dog and presser foot raising configuration view of the independently operating feed foot mechanism of a split lockstitch machine of the present application;

FIG. 5 is a schematic view of a feed dog of an independently operating bobbin thread mechanism of a split butt seam machine of the present application;

FIG. 6 is a schematic view of a rotating shuttle assembly of the independently operating bobbin thread mechanism of a split flat bed sewing machine of the present application;

FIG. 7 is a view of a rotating shuttle assembly configuration of an independently operating bobbin thread mechanism of a split lockstitch sewing machine of the present application;

FIG. 8 is a schematic view of a thread trimming assembly of the independently operating bobbin thread mechanism of a split flat bed sewing machine of the present application;

FIG. 9 is a view showing the internal construction of a thread trimming assembly of the independently operating thread take-up mechanism of a separate type sewing machine according to the present application;

FIG. 10 is a schematic view of a thread trimming push rod of the independently operating bobbin thread mechanism of a split bed sewing machine of the present application;

FIG. 11 is a schematic view of a presser foot lifting assembly of the independently operating bobbin thread mechanism of a split bed sewing machine of the present application;

FIG. 12 is a schematic view of a thread take-up assembly of the independently operating looper of a split lockstitch sewing machine according to the present application.

Reference numerals: a thread feeding mechanism 10, a needle bar 11, a machine needle 12, a bottom thread mechanism 20, a fixed seat 21, a bottom plate 211, a feed dog assembly 25, a feed dog 251, an up-down lifting motor 252, a front-back feed motor 253, a feed dog connecting frame 254, a supporting frame 255, a bottom portion 2551, a feed dog cam I256, a feed dog cam II 257, a needle plate 258, a fixed copper sleeve 259, a driving end swinging rod 25a, a copper sleeve swinging rod 25b, a rotating disc 25e, a connecting rod 25f, a bracket 250, a supporting rod 25c, a groove 25d, a rotating shuttle assembly 26, a suspension rotating shuttle 261, a bottom thread driving motor 262, a notch 262c, a hook needle 263, a fixed rod 264, a rotating shuttle fixed seat 265, an anti-slip cover plate 266, a hollow rotating shaft 267, a thread frame 268, a thread trimming assembly 27, a thread trimming driving source 271, a thread trimming push rod 272, a push block 272a, a connecting rod end 272b, a sliding groove 272c, a thread trimming driving source bracket 27e, an elastic piece 273, a push blade 274, a push plate connecting rod, the secondary push broach 276, the trimming bracket 277, the push broach seat 278, the push broach connecting rod seat 279, the secondary push broach connecting rod seat 270, the bump 28, the table plate 30, the machine head 40, the spindle motor 41, the table plate 30, the controller 60, the operation panel 61, the base 70, the thread take-up assembly 80, the thread take-up auxiliary disc 81, the thread take-up disc 82, the thread take-up column 821, the thread pulling groove 822, the thread take-up connecting rod 83, the first thread clamp 84, the second thread clamp 85 and the thread take-up rotating shaft 86.

Detailed Description

The following detailed description of the preferred embodiments of the present application, taken in conjunction with the accompanying drawings, is provided to enable those skilled in the art to more readily understand the advantages and features of the present application, and is intended to more clearly and distinctly define the scope of the invention, which is set forth by way of illustration only and is not intended to be limiting of the invention.

FIG. 1 is a schematic view of the independent running bobbin thread mechanism of a separate type sewing machine according to the present application. The present flat seamer has a structure having a head 40, a controller 60, a platen 30 and a base 70. The machine head 40 is provided with a thread feeding mechanism 10, a spindle motor 41 and a controller 60, the controller 60 is provided with an operation panel 61 which is arranged on the front surface of the machine head 40, the controller 60 is arranged on the side edge of the machine head 40, and a base 70 is positioned below the bedplate 30; the bottom thread mechanism 20 is installed under the bedplate 30, and the top thread mechanism 10 and the bottom thread mechanism 20 are two sewing mechanisms independently arranged on the flat sewing machine. The thread feeding mechanism 10 drives the needle bar, presser foot and thread take-up assembly 80 by the spindle motor 41. The bottom thread mechanism 20 has a plurality of driving sources which independently operate, the plurality of driving sources respectively complete the feed dog assembly 25, the rotating shuttle assembly 26 and the thread cutting assembly 27, the feed dog assembly 25, the rotating shuttle assembly 26 and the thread cutting assembly 27 are assembled and installed on the fixed seat 21, in other words, the bottom thread mechanism 20 does not receive the power from the spindle motor 41, the bottom thread mechanism is not in mechanical transmission connection with the spindle motor of the top thread mechanism, therefore, the mechanical transmission mode of the flat seamer is separated up and down, and the top thread mechanism 10 and the bottom thread mechanism 20 have respective operation power devices.

The independent operation bottom thread mechanism of the separated sewing machine adopts a mechanical transmission separated structure, the upper thread mechanism 10 basically keeps the structure of the original sewing machine, and only the thread take-up assembly 80 is technically improved. The bobbin thread mechanism 20 is subject to major modifications, particularly subversion of the feed dog assembly 25 and the rotary shuttle assembly 26. The flat bed sewing machine can realize the sewing operation of the bottom thread by adopting a plurality of micro driving sources, realizes the small-sized modular manufacture of the bottom thread mechanism 20, is suitable for the installation and the use of flat bed sewing machines of different styles, ensures that the flat bed sewing machine has a simplified mechanical transmission structure, and does not need to provide a lubricating system during the operation of the mechanical transmission structure.

FIG. 2 and FIG. 3 are schematic views of the separate stitcher bobbin thread assembly 20 of the present application. The bobbin thread mechanism 20 has a feed dog assembly 25, a rotating shuttle assembly 26 and a thread cutting assembly 27. The bottom thread mechanism 20 is arranged in a fixed seat 21, the fixed seat 21 is fixedly arranged below the bedplate 30, and the feed dog assembly 25, the rotating shuttle assembly 26 and the thread trimming assembly 27 are assembled and arranged in the fixed seat 21. The lower thread mechanism 20 is mounted on the side of the platen 30 close to the upper thread mechanism 10, and the presser foot drive source 51 is mounted on the side of the base 70 close to the fixed base 21.

In fig. 2, fig. 3, fig. 4 and fig. 5, the feed dog assembly 25 of the present application has an up-down motor 252 and a front-back feed motor 253, and the feed motion of the feed dog is realized by means of the up-down motor 252 and the front-back feed motor 253 simultaneously and cooperatively outputting a swing source. The two swing driving sources implement non-lateral transmission of the swing source to the feed dog 251 to realize the feeding action of the feed dog, and the feeding action of the feed dog of the existing sewing machine is realized by receiving the swing sources from two sides of the feed dog, which is the remarkable characteristic that the swing sources of the application are different from the prior art.

The two swing driving sources indirectly act on the feed dog 251 to realize the feed action, wherein the lower lifting motor 252 indirectly acts on the feed dog connecting frame 254 and the feed dog 251, and the feed dog assembly 25 specifically implemented comprises the upper lifting motor 252, the lower lifting motor 253, the front and rear feed motors 253, a supporting frame 255, the feed dog connecting frame 254, a bracket 250, a first driving feed lifting cam 256, a second drive lifting cam 257 and the like. And a first drive feed lifting cam 256 and a second feed lifting cam 257 are mounted on output shafts at two ends of the up-down lifting motor 252.

The up-down lifting motor 252 is fixed on a bottom plate 211 of the fixed seat 21, the up-down lifting motor 252 indirectly acts on a bottom portion 2551 of the supporting frame 255, and a first drive feed lifting cam 256 and a second drive feed lifting cam 257 are mounted at two ends of the up-down lifting motor 252 and are arranged on two sides of the fixed seat 21. The first feed lifting cam 256 and the second feed lifting cam 257 respectively act on the two lugs 28 on the two sides of the bottom of the support frame 255. The front and rear sides of the support frame 255 are respectively provided with a support rod 25c, a bracket 250 is fixed on the bottom plate 211, the bracket 250 is positioned at the front and rear parts of the up-down lifting motor 252, a groove 25d is formed at the top of the bracket 250 and used for supporting the support rod 25c, and the whole support frame 255 is supported by the groove 25 d. The up-down lifting motor 252 controlled by the controller 60 rotates to drive the first feed lifting cam 256 and the second feed lifting cam 257 to rotate, and the first feed lifting cam 256 and the second feed lifting cam 257 have the structural characteristics of unequal diameters, so that the support frame 255 can swing up and down to meet the requirement of the feed dog 251 and is limited in the groove 25d, and the feed dog 251 can be driven to swing up and down.

A back and forth swing device is installed on an output shaft of the front and rear cloth feeding motor 253 to realize the back and forth swing motion of the cloth feeding dog 251. The above-mentioned support 255 and the feed dog link 254 are movably fitted, and the back-and-forth swing device of this embodiment is specifically: the fixed copper sleeves 259 are provided at both ends of the upper portion of the support frame 255, and the front and rear cloth feeding motors 253 are provided at the sides of the support frame 255. The feed dog 251 is fixedly connected to the upper side of the feed dog connecting frame 254, and the copper bush swinging rod 25b and the driving end swinging rod 25a which are arranged at the two ends of the feed dog connecting frame 254 are respectively arranged on the fixed copper bushes 259 which are arranged at the two ends of the supporting frame 255, namely the feed dog connecting frame 254 is movably matched with the supporting frame 255. The feed dog connecting frame 254 is movably connected with a connecting rod 25f, the connecting rod 25f is movably connected with a rotary disc 25e, the connecting rod 25f is movably connected with the eccentric position of the rotary disc 25e, and the rotary disc 25e is fixed on the output shaft of the front and rear feed motors 253. The front and rear feed motors 253 controlled by the controller 60 drive the rotary disc 25e to drive the connecting rod 25f, and the movable connecting rod 25f swings to enable the feed dog connecting frame 254 to swing back and forth to meet the feeding requirement of the feed dog 251, so that the feed dog 251 swings back and forth.

Under the control of the controller 60, the forward and backward swinging motion of the forward and backward feed motor 253 and the upward and downward swinging motion of the upward and downward elevating motor 252 are transmitted to the feed dog 251 through the feed dog link 254, and are also restricted in the groove 25d, thereby forming a feed dog 251 in a feed motion state, and realizing the feed motion of the feed dog 251 of the sewing machine.

The fixing seat 21 further has a needle plate 258 connected with the fixing seat 21 as a whole, and the feed dog 251 operates in the needle plate 258.

The vertical movement source transmitted from the vertical movement motor 252 and the front and rear movement sources transmitted from the front and rear cloth feeding motors 253 are indirectly acted on the cloth feeding dog 251 together by the vertical movement motor 252 and the controller 60, thereby realizing the cloth feeding action of the cloth feeding dog 251 of the sewing machine. The up-down lifting motor 252 and the front-back cloth feeding motor 253 are controlled by the controller 60 to realize programmed control on the adjustment of the sewing needle pitch, so that the traditional method for adjusting the needle pitch of the original sewing machine is overcome, meanwhile, the separation of a mechanical transmission mechanism of the sewing machine is realized, the technical defect that the complex mechanical transmission mechanism of the existing sewing machine needs a lubricating system for paving when the mechanism is operated is overcome, the manufacturing difficulty of the sewing machine is greatly reduced, and the sewing machine has epoch-making technical value.

In fig. 6 and 7, the rotating shuttle assembly 26 of the present application has a floating rotating shuttle 261, a rotating shuttle fixing base 265, an anti-slip cover plate 266, a thread stand 268, a lower thread driving motor 262 and a hook 263. The rotating shuttle fixing seat 265 is fixed and static when the lockstitch sewing machine is used for sewing, the suspension rotating shuttle 261 is placed inside the rotating shuttle fixing seat 265, the thread stand 268 is placed inside the suspension rotating shuttle 261, the anti-slip cover plate 266 is arranged on the outer side of the thread stand 268 and is fixedly connected to the rotating shuttle fixing seat 265, the anti-slip cover plate 266 is used for abutting against the suspension rotating shuttle 261 and/or the thread stand 268, and the anti-slip cover plate 266 is used for preventing the suspension rotating shuttle 261 and/or the thread stand from slipping out of the rotating shuttle fixing seat 265.

The hook 263 is fixedly connected to the hollow shaft 267 of the bobbin thread driving motor 262, the hollow shaft 267 of the bobbin thread driving motor 262 is sleeved on the fixing rod 264 provided on the rotating shuttle fixing seat 265, the operation track of the hook 263 is concentric with the fixing rod 264, and the fixing rod 264 is concentric with the thread stand 268. In summary, the lower thread driving motor 262 has a middle idle shaft 267 for driving the hook needle 263 to hook the upper thread of the needle 12 and form a hitch with the lower thread of the thread frame 268 of the floating rotary hook 261. A slide gap and a positioning device are arranged between the suspension rotating shuttle 261 and the rotating shuttle fixing seat 265, and a slide gap is arranged between the suspension rotating shuttle 261 and the anti-slip cover plate 266. The rotating shuttle assembly 26 of the application cancels a mechanical transmission mechanism of the original lockstitch sewing machine, and removes a change gear and a connecting transmission rod thereof, so that the rotating shuttle assembly 26 directly uses the bottom line driving motor 262 to be beneficial to the intelligent control of the controller 60, the manufacturing difficulty and the manufacturing cost of the lockstitch sewing machine are greatly reduced, and the practicability is higher.

Referring to fig. 8, 9 and 10, the thread cutting assembly 27 of the present application has a lower thread driving motor 262, a hollow rotary shaft 267, a thread cutting driving source 271, a push-type cutter holder 270, a thread cutting push rod 272, an elastic member 273, a main cutter 274, a main push-type cutter link 275, a sub-cutter 276, a thread cutting holder 277, a main push-type cutter holder 278, and a sub-push-type cutter link 279. The thread trimming assembly 27 of the present application is generally: the thread cutting push rod 272 of the thread cutting assembly 27 is pushed and displaced by the thread cutting drive source 271, and the displaced thread cutting push rod 272 is rotated and pushed by the lower thread drive motor 262 of the rotary shuttle assembly 26 to perform the thread cutting operation.

When the sewing is finished, that is, when the lower thread driving motor 262 is operated to finish the sewing in the last turn, the controller 60 starts the above-mentioned thread cutting operation. Firstly, the thread trimming driving source 271 is started to push the thread trimming push rod 272, then the push block 272a arranged at the front end of the thread trimming push rod 272 reaches the notch 262c arranged on the hollow rotating shaft 267, so that the rotating hollow rotating shaft 267 drives the thread trimming push rod 272 to rotate, and finally the thread trimming push rod 272 pushes each component of the thread trimming component 27 to execute thread trimming.

The specific implementation modes are as follows: the thread cutting push rod 272 is firstly pushed by the thread cutting drive source 271, the thread cutting drive source 271 is then pushed to rotate by the bobbin thread drive motor 262, the rotating thread cutting push rod 272 generates thrust on the secondary push rod 279 and the primary push rod 275, the secondary push rod 279 and the primary push rod 275 push the primary push rod tool rest 278 and the push rod tool rest 270, the primary push rod tool rest 278 and the push rod tool rest 270 are respectively connected with the primary knife 274 and the push rod tool 276, and the primary push rod tool rest 274 and the push rod tool rest 276 are pushed to be connected downwards to complete thread cutting action when the primary push rod tool rest 278 and the push rod tool rest 270 push the secondary knife 274 and the push rod tool 276 oppositely. The thread trimming push rod 272 has a link end 272b hinged to the main push link 275, and the sub push link 279 is hinged to a middle portion of the thread trimming push rod 272. The thread trimming push rod 272 further has a slide groove 272c at a middle position thereof, and the slide groove 272c is matched with a slide bar 262a provided on the bobbin thread driving motor 262 or the thread trimming driving source bracket 27 e. An elastic piece 273 is further arranged between the trimming driving source bracket 27e and the trimming push rod 272. After finishing the thread cutting action, the thread cutting driving source 271 is immediately reset to the initial position, and then the thread cutting push rod 272, the main knife 274 and the push sub-knife 276 also return to the initial position, thereby finishing one thread cutting action.

In the above description, the notch 262c of the hollow rotating shaft 267 is used to drive the pushing block 272a of the thread trimming pushing rod 272 to perform a rotary thread trimming operation, and the thread trimming assembly with different structures can be implemented to perform the thread trimming operation by using this method.

In fig. 11 and 12, a thread take-up assembly 80 of an independently operated bottom thread mechanism of a split flatbed sewing machine of the present application has a take-up sub-disc 81, a take-up disc 82, a rotating shaft 86, a first thread gripper 84, a second thread gripper 85 and a thread take-up link 83. A take-up column 821 is fixedly arranged at the eccentric position of the take-up reel 82, the take-up column 821 is provided with a pull groove 822, the sewing upper thread is led to the take-up column 821 from the position between the first thread clamping device 84 and the second thread clamping device 85 and is sleeved on the pull groove 822, the take-up reel 82 and the take-up column perform circular operation, and the take-up column 821 carries out take-up or pay-off of the sewing upper thread under the change of the position under the circular operation. The take-up reel 82 is connected with a power input end thread picking rotating shaft, the circumferential operation of the take-up reel 82 can be realized by the action of the thread picking rotating shaft 86 connected with the take-up auxiliary reel 81 to transmit power, the rotation of the take-up auxiliary reel 81 comes from the main shaft motor 41 of the lockstitch sewing machine to drive the needle rod 11 to push up and down, namely, the needle rod 11 is connected with the take-up auxiliary reel 81 through the thread picking connecting rod 83, the thread picking connecting rod 83 is connected on the eccentric position of the take-up auxiliary reel 81, and the up-and-down pushing force of the needle rod 11 drives the take-up auxiliary reel.

In short, when the spindle motor 41 drives the needle bar 11 to move up and down, the thread take-up link 83 drives the thread take-up sub-disc 81 to perform a circular operation, the thread take-up sub-disc 81 transmits power to the thread take-up disc 82, and the thread take-up disc 82 finally drives the thread take-up post 821 to perform a thread take-up operation. The thread take-up assembly 80 is simple in structure, the thread take-up speed is consistent with the operation of the needle bar 11, the thread take-up and thread release of the sewing upper thread are more accurate, and the intelligent control level of the lockstitch sewing machine is improved.

The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application, or which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims (10)

1. The independent operation bottom thread mechanism of the split type lockstitch sewing machine is provided with a thread feeding mechanism (10), a bottom thread mechanism (20) and a bedplate (30), and is characterized in that the bottom thread mechanism (20) is connected with a spindle motor (41) of the thread feeding mechanism (10) in a non-mechanical transmission mode, the bottom thread mechanism (20) is provided with a feed dog assembly (25), a rotating shuttle assembly (26) and a thread cutting assembly (27) which are installed on a fixing seat (21) in a combined mode, the fixing seat (21) is installed below the bedplate (30), the thread feeding mechanism (10) is provided with a thread taking-up assembly (80), and a thread taking-up column (821) is fixedly arranged on an eccentric position of the thread taking-up assembly (80) provided with a take-up reel (82).

2. The independent running bottom thread mechanism of the split flat sewing machine according to claim 1, wherein the feed dog assembly (25) has an up-down lift motor (252) and a front-back feed motor (253), the up-down lift motor (252) indirectly acts on the feed dog link (254) and the feed dog (251) of the feed dog assembly (25), the up-down lift motor (252) indirectly acts on the bottom (2551) of the support frame (255) of the feed dog assembly (25), the support frame (255) is movably matched with the feed dog link (254), the suspension rotating shuttle (261) of the rotating shuttle assembly (26) is placed inside the rotating shuttle fixing seat (265), and the rotating shuttle fixing seat (265) is connected with an anti-slip cover plate (266) and abuts against the suspension rotating shuttle (261); the thread cutting push rod (272) of the rotating shuttle assembly (26) is pushed by the thread cutting drive source (271) and moves, and the thread cutting push rod (272) is pushed by the bottom thread drive source (262) of the rotating shuttle assembly (26) and rotates to execute thread cutting action.

3. The independent operating bottom thread mechanism of the split sewing machine according to claim 1, wherein the thread take-up column (821) has a thread take-up groove (822), the thread take-up groove (822) is sleeved with a sewing upper thread, and the sewing upper thread is led to the thread take-up column (821) from a position between a first thread gripper (84) and a second thread gripper (85) of the thread take-up assembly (80).

4. The independently operated bobbin thread mechanism of a divided lockstitch sewing machine according to claim 1, wherein the take-up reel (82) is connected to a power input take-up spindle (86).

5. The independent running bobbin thread mechanism of a separate type lockstitch sewing machine according to claim 2, wherein the output shafts at both ends of the up-down lift motor (252) are respectively provided with a first feed lifting cam (256) and a second feed lifting cam (257), the first feed lifting cam (256) and the second feed lifting cam (257) respectively act on two convex blocks (28) at the bottom of the support frame (255) of the feed dog assembly (25), and the up-down lift motor (252) is fixed on the bottom plate (211) of the lockstitch sewing machine.

6. The independent operation bobbin thread mechanism of the separate flat sewing machine according to claim 2, wherein the front and rear cloth feeding motors (253) drive the rotary disc (25e) to drive the connecting rod (25f), the connecting rod (25f) is movably connected to the eccentric position of the rotary disc (25e), the connecting rod (25f) is movably connected with the cloth feeding teeth connecting frame (254), the copper sleeve swinging rod (25b) and the driving end swinging rod (25a) which are arranged at the two ends of the cloth feeding teeth connecting frame (254) are respectively arranged on the fixed copper sleeves (259) which are arranged at the two ends of the supporting frame (255), the cloth feeding teeth (251) are connected above the cloth feeding teeth connecting frame (254), the front and rear cloth feeding motors (253) are fixed at the upper part of the supporting frame (255) of the flat sewing machine, and the output shafts of the front and rear cloth feeding motors (253) are provided with the reciprocating swingers.

7. The independent operation bobbin thread mechanism of the separate type lockstitch sewing machine according to claim 5 or 6, wherein the front and rear sides of the supporting frame (255) are respectively provided with a supporting rod (25c), the front and rear positions of the up-down lifting motor (252) fixed on the bottom plate (211) are respectively provided with a bracket (250), and the top of the bracket (250) is provided with a groove (25d) for supporting the supporting rod (25 c).

8. The independent operating bottom thread mechanism of the split flat sewing machine according to claim 2, wherein the rotating shuttle fixing seat (265) is stationary during sewing, a sliding thread gap and a positioning arrangement are arranged between the suspension rotating shuttle (261) and the rotating shuttle fixing seat (265), and the suspension rotating shuttle (261) and the anti-slipping cover plate (266) have a sliding thread gap; line frame (268) have been placed to suspension rotating shuttle (261) inside, well idle shaft (267) drive crochet hook (263) that bottom line driving source (262) had collude and get the sewing of the last line of eedle (152) and suspension rotating shuttle (261) interior line frame (268) and form the noose, crochet hook (263) and the hollow rotating shaft (267) fixed connection of bottom line driving source (262), the hollow rotating shaft (267) cover of bottom line driving source (262) are established on dead lever (264) that have with rotating shuttle fixing base (265), crochet hook (263) orbit and dead lever (264) concentric setting, and dead lever (264) and line frame (268) concentric setting.

9. The independent running bottom thread mechanism of the split type flush joint machine according to claim 2, wherein the thread cutting driving source (271) pushes the thread cutting push rod (272), a push block (272a) arranged at the front end of the thread cutting push rod (272) reaches a notch (26c) arranged on the hollow rotating shaft (267), a middle idle shaft (267) arranged on the bottom thread driving source (262) drives the thread cutting push rod (272) to rotate, and the tail end of the thread cutting assembly (27) performs thread cutting actions performed by the assembly.

10. The independent operating bobbin thread mechanism of a split type lockstitch sewing machine according to claim 9, wherein the thread cutting push rod (272) pushes the secondary push-knife link (279) and the primary push-knife link (275), the secondary push-knife link (279) and the primary push-knife link (275) push the primary push-knife holder (278) and the push-knife holder (270), the primary push-knife holder (278) and the push-knife holder (270) are respectively connected with the primary knife (274) and the secondary push-knife (276), and an elastic member (273) is further provided between the thread cutting drive source bracket (27e) of the thread cutting assembly (27) and the thread cutting push rod (272).

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