CN212388184U - Chain type lockstitch sewing machine - Google Patents

Abstract

The utility model discloses a chain type lockstitch sewing machine, which comprises an upper thread cutting device, a lower thread cutting device, a thread loosening controller, a thread clamping device for controlling the tightness degree of the upper thread and a bottom thread clamping device for controlling the tightness degree of the bottom thread; when the thread loosening controller receives a thread cutting instruction, the upper thread gripper and the lower thread gripper are controlled to simultaneously loosen threads, the upper thread cutting device is controlled to cut off and grip the upper threads loosened on the fabric, and the lower thread cutting device is controlled to cut off and grip the lower threads loosened on the curved needle. The application provides a chain flush joint machine loosens the back at facial suture and bottom line, and two tangent line devices are cut facial suture, bottom line respectively to with surplus suture centre gripping, the line that takes off when preventing to play the seam next time, the wireless pigtail production behind the tangent line makes the thread end more pleasing to the eye behind the tangent line.

Description

Chain type lockstitch sewing machine

Technical Field

The utility model relates to a sewing machine technical field, more specifically say, relate to a chain flush joint machine.

Background

In order to reduce the labor intensity of clothing workers and improve the work efficiency of clothing production, more and more sewing machines are equipped with the functions of automatic thread trimming, automatic presser foot lifting, automatic backstitch and the like. Based on the automatic requirement of the sewing machine, in the field of chain-type lockstitch sewing machines, an automatic thread trimming function is provided, but most of the automatic thread trimming mechanisms of the existing chain-type lockstitch sewing machines are used for trimming thread braids after sewing is finished, and the thread trimming method has the defects of longer length of residual thread braids, more residual thread ends, unattractive appearance after thread trimming and the like, so that the chain-type lockstitch sewing machine needs a brand-new thread trimming mechanism and method to solve the problems.

In summary, the problem to be solved by those skilled in the art is how to provide a chain type flat sewing machine capable of cutting off a thread in a sewing process.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a chain-type lockstitch sewing machine, which can cut off the upper thread and the bottom thread during sewing, and has no wire braid after cutting off the thread.

In order to achieve the above object, the present invention provides the following technical solutions:

a chain type flat sewing machine comprises an upper thread cutting device, a lower thread cutting device, a thread loosening controller, an upper thread gripper for controlling the tightness degree of an upper thread, and a lower thread gripper for controlling the tightness degree of a lower thread; and when receiving a thread cutting instruction, the thread loosening controller controls the upper thread gripper and the lower thread gripper to simultaneously loosen threads, controls the upper thread cutting device to cut off and grip the upper threads loosened from the fabric, and controls the lower thread cutting device to cut off and grip the lower threads loosened from the looper.

Optionally, the fabric cutting device further comprises a position adjusting mechanism for adjusting the position of the upper thread cutting device so that the upper thread cutting device is tightly attached to the fabric cutting line.

Optionally, the position adjusting mechanism includes three adjusting plates, waist-shaped holes are respectively formed in the three adjusting plates, and the shell, the first adjusting plate, the second adjusting plate, the third adjusting plate, and the upper thread cutting device of the chain type lockstitch sewing machine are sequentially connected through bolts located in the waist-shaped holes.

Optionally, the downcutting apparatus comprises: the lower tangent line movable knife drive plate, the drive of lower tangent line movable knife drive plate follow that the spout removed the lower tangent line drive assembly, be equipped with the coupler body that is used for the hook to get the bottom line and be fixed in of spout cut the lower tangent line movable knife of line movable knife drive plate down, be located cut the first side of line movable knife down and be fixed in lower tangent line fixed knife in the spout, hug closely lower tangent line movable knife second side just is fixed in the lower tangent line trapping mechanism of bottom line trapping mechanism.

Optionally, the upper line severing device comprises: the thread cutting device comprises a thread cutting mounting plate, a thread cutting sliding plate attached to the thread cutting mounting plate, an upper thread cutting driving assembly driving the thread cutting sliding plate to move linearly, an upper thread cutting movable knife provided with a hook body for hooking an upper thread and fixed on the thread cutting sliding plate, an upper thread cutting fixed knife positioned on the first side of the upper thread cutting movable knife and fixedly connected with the thread cutting mounting plate, and an upper thread cutting thread clamping component clinging to the second side of the upper thread cutting movable knife and fixed on the thread cutting mounting plate.

Optionally, the tangent sliding plate is provided with a strip-shaped hole, the tangent sliding plate is connected with the tangent mounting plate through a sliding plate stud penetrating through the strip-shaped hole, the tangent sliding plate is provided with a sliding plate spring stud, one end of the auxiliary return spring is connected with the sliding plate stud, and the other end of the auxiliary return spring is connected with the sliding plate spring stud.

Optionally, each of the upper thread gripper and the lower thread gripper comprises two thread clamping pieces and a rotatable thread releasing shaft, and a thread releasing claw which can rotate along with the thread releasing shaft and extends into a position between the two corresponding thread clamping pieces is arranged on the thread releasing shaft; the upper thread clamping device is characterized in that the thread releasing shaft and the bottom thread clamping device are the same rotating shaft.

Optionally, the thread releasing controller comprises a driver and a thread releasing driving plate, one end of the thread releasing driving plate is fixedly connected with the thread releasing shaft, and the other end of the thread releasing driving plate is connected with the driving end of the driver.

Through above-mentioned scheme, the chain flush joint machine that this application provided's beneficial effect lies in:

the application provides a chain flush joint machine is including going up the traditional thread binding putting, lower thread cutting device, the upper thread gripper, bottom line gripper and loose thread controller, in the course of the work, loose thread controller control upper thread gripper and bottom line gripper pine line simultaneously, after upper thread and bottom line become loose, go up the upper thread that the traditional thread binding putting unclamped on with the surface fabric and cut off and centre gripping upper thread, and the bottom line that loosens on the lower thread cutting device will the looper cuts off and centre gripping bottom line, the remaining upper thread that the tangent line device will cut off is cliied with remaining bottom line and is taken off the line when can preventing next time from starting to sew up, this kind of tangent line mode is wireless pigtail production behind the tangent line, make the thread end more pleasing to the eye behind the tangent line.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a chain type lockstitch sewing machine provided in an embodiment of the present application;

FIG. 2 is a front view of the chain lockstitch machine shown in FIG. 1;

FIG. 3 is a rear view of the chain lockstitch machine shown in FIG. 1;

FIG. 4 is a schematic view of the installation of an under-cut thread device in the chain lockstitch machine shown in FIG. 1; in order to clearly show the installation position of the lower thread cutting device, other parts of the chain type flat sewing machine are hidden in the drawing;

fig. 5 is a schematic view of a thread releasing controller cooperating with a thread clamping device according to an embodiment of the present application;

FIG. 6 is an exploded view of an upper line severing device according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural view of the upper trimming device shown in FIG. 6;

FIG. 8 is a partially enlarged view of the front end of the upper trimming device shown in FIG. 7;

FIG. 9 is a schematic view of a tangent mounting plate in the upper tangent device shown in FIG. 7;

fig. 10 is an exploded view of an under-cutting device according to an embodiment of the present disclosure;

FIG. 11 is a schematic view of the first viewing angle of the lower tangent device shown in FIG. 10;

FIG. 12 is a second perspective view of the lower tangent device shown in FIG. 10;

fig. 13 is a schematic structural view of a bobbin thread holder in the lower thread cutting device shown in fig. 10.

The reference numerals in FIGS. 1-13 are:

the device comprises an upper tangent driving electromagnet 1, a tangent mounting plate 2, a guide groove 2-1, a tangent sliding plate 3, a driving plate stud 4, a first nut 5, a tangent driving plate 6, a second driving plate fastening screw 6-1, a second nut 6-2, a sliding plate stud 7, an auxiliary return spring 8, a sliding plate spring stud 9, a sliding plate screw 10, an upper tangent fixing cutter screw 11, an upper tangent fixing cutter 12, an upper tangent movable cutter 13, an upper tangent clamp plate 14, an upper tangent clamp plate 15, an upper tangent clamp wire seat 16, a first screw 17 and a movable cutter fixing screw 18;

the device comprises a driver 19, a thread-releasing electromagnet iron core 20, a thread-releasing electromagnet pin 21, a thread-releasing driving plate 22, a first nut 22-1, a first driving plate fastening screw 22-2, a thread-releasing shaft 23, a thread-releasing claw 24, a bottom thread gripper 25, a thread-gripping piece 26 and a split retainer 27;

the lower wire cutting driving electromagnet 28, the lower wire cutting electromagnet mounting plate 29, the lower wire cutting movable knife 30, the lower wire cutting movable knife driving plate 31, a bottom wire clamping seat 32, a lower wire cutting fixed knife screw 33, a lower wire cutting knife driving plate 34, a third nut 35, a lower wire cutting fixed knife 36, a third screw 37, a lower wire cutting clamping plate 38, a lower wire cutting wire pressing plate 39, a lower wire cutting clamping seat 40, a fastening screw 41, a fourth screw 42, a third driving plate fastening screw 43, a fourth nut 44 and a second screw 45;

an up-down adjusting plate 46, a left-right adjusting plate 47, an angle adjusting plate 48;

an upper thread cutting device 49, a lower thread cutting device 50, a curved needle 51, a thread loosening controller 52 and a position adjusting mechanism 53.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 3, the present application provides a chain type lockstitch sewing machine including a thread releasing controller 52, a position adjusting mechanism 53, two thread cutting devices, and two thread grippers; wherein the two thread cutting devices are an upper thread cutting device 49 and a lower thread cutting device 50, and the two thread clamping devices are a surface thread clamping device and a bottom thread clamping device 25.

The thread trapper is used for controlling the elasticity degree of suture, namely, the upper thread trapper controls the upper thread elasticity degree, and the bottom thread trapper 25 controls the bottom thread elasticity degree. The yarn trappers can achieve the functions through various structures, in one embodiment, referring to fig. 5, each yarn trapper comprises two yarn clamping sheets 26 and a rotatable yarn loosening shaft 23, and the yarn loosening shaft 23 is provided with a yarn loosening claw 24 which can rotate along with the yarn loosening shaft 23 and extends into the space between the two corresponding yarn clamping sheets 26; in addition, since the two thread grippers need to control the upper thread and the lower thread to be loosened simultaneously, for the convenience of control, the same rotating shaft is adopted as the thread loosening shaft 23 of the upper thread gripper and the thread loosening shaft 23 of the lower thread gripper 25 simultaneously, and at this time, the movement of the two thread loosening claws 24 can be realized by controlling the rotation of one thread loosening shaft 23. In actual installation, referring to fig. 4, the lower thread gripper 25 is installed on a rear window plate of the sewing machine.

The thread releasing controller 52 can control the two thread grippers to release thread simultaneously; meanwhile, the thread slackening controller 52 is electrically connected to the two thread cutting devices and sends thread cutting instructions to the two thread cutting devices, so that the two thread cutting devices perform thread cutting operations after the upper thread and the lower thread are slackened. The thread cutting command received by the thread slackening controller 52 may be specifically triggered by the user operating a key at the user end and sent by the control system of the sewing machine.

In one embodiment, the thread slacking controller 52 comprises a driver 19 and a thread slacking drive plate 22, the thread slacking drive plate 22 being fixedly connected at one end to the thread slacking spool 23 and at the other end to the driving end of the driver 19.

In the actual assembly process, the driver 19 may specifically select a loose-wire electromagnet, a stepping motor, or an air cylinder, and the like, for example, the driver 19 specifically adopts a loose-wire electromagnet. Referring to fig. 5, the thread-releasing electromagnet is mounted on the sewing machine housing; the front end of the loose electromagnet core 20 is provided with a fork-shaped opening; the upper end of the loose wire driving plate 22 is provided with a strip-shaped mounting hole; the thread releasing electromagnet pin 21 penetrates through a fork-shaped opening of the thread releasing electromagnet iron core 20 to connect the thread releasing driving plate 22 with the thread releasing electromagnet iron core 20; a split washer 27 is mounted on the end of the thread releasing electromagnet pin 21 to prevent the thread releasing drive plate 22 from disengaging from the thread releasing electromagnet core 20. The lower end of the thread releasing driving plate 22 is bent into a U shape, a mounting hole and a gap for adjusting the sectional area of the mounting hole are formed, and the thread releasing shaft 23 penetrates through the thread releasing claw 24 and the mounting hole at the lower end of the thread releasing driving plate 22 to realize connection of the thread releasing shaft, the thread releasing claw and the mounting hole; the first nut 22-1 and the first driving plate fastening screw 22-2 adjust the width of the gap to realize the fastening between the thread releasing shaft 23 and the thread releasing driving plate 22. The thread releasing claw 24 is fixed to the thread releasing shaft 23 by a screw.

The operating principle of the thread slacking controller 52 is as follows: after sewing is finished, the driver 19 drives the thread releasing electromagnet core 20 to move rightwards, the thread releasing driving plate 22 is driven to swing clockwise, the thread releasing claw 24 rotates clockwise, the tip end of the thread releasing claw 24 enters between the two thread clamping pieces 26 to pull the two thread clamping pieces 26 apart, and then the thread releasing function is achieved. Accordingly, according to the general thread releasing structure of the chain lockstitch sewing machine, the lower thread gripper 25 and the thread gripper control the thread clamping piece 26 to be opened simultaneously through the same thread releasing shaft 23, the simultaneous thread releasing function of the upper thread and the lower thread is realized, so that the driver 19 can simultaneously realize the thread releasing function of the lower thread gripper 25 and the thread gripper. The thread loosening controller 52 is synchronous with electromagnetic signals of the upper thread cutting device 49 and the lower thread cutting device 50, so that when the upper thread cutting device 49 and the lower thread cutting device 50 hook threads, the thread clamping sheets 26 of the upper threads and the bottom threads are ensured to be opened, the instant thread hooking is free from resistance, and the thread breakage and the thread end are prevented from being too short.

The upper thread cutting device 49 is used to cut the upper thread and clamp the remaining upper thread. There are various options for the structure of the upper cutting device 49, and in one embodiment, referring to fig. 6 to 9, the upper cutting device 49 includes: the thread cutting device comprises a tangent mounting plate 2, a tangent sliding plate 3 attached to the tangent mounting plate 2, an upper tangent line driving assembly driving the tangent sliding plate 3 to move linearly, an upper tangent line movable knife 13 provided with a hook body for hooking an upper thread and fixed on the tangent sliding plate 3, an upper tangent line fixed knife 12 located on the first side of the upper tangent line movable knife 13 and fixedly connected with the tangent mounting plate 2, and an upper tangent line clamping component tightly attached to the second side of the upper tangent line movable knife 13 and fixed on the tangent mounting plate 2.

In the actual assembly process, the upper tangent line driving assembly may specifically adopt an electromagnet, a stepping motor, or a cylinder and other driving elements, and the upper tangent line driving assembly specifically adopts the upper tangent line driving electromagnet 1 as an example. The tangent mounting plate 2 is connected with the upper tangent driving electromagnet 1 through a first nut 5; a first end of the tangent drive plate 6 is provided with a mounting hole and a strip-shaped gap for adjusting the sectional area of the mounting hole, the mounting hole is sleeved on a mounting rod of the upper tangent drive electromagnet 1, and the mounting gap is adjusted through a fastening screw 6-1 of a second drive plate and a second nut 6-2, so that the mounting hole is in interference fit with the mounting rod of the upper tangent drive electromagnet 1; the second end of the tangent drive plate 6 is provided with an oblong mounting hole and is sleeved on the drive plate stud 4; the drive plate stud 4 is fixedly connected with the tangent sliding plate 3; meanwhile, the tangent sliding plate 3 is provided with two long round holes, and the sliding plate stud 7 penetrates through one long round hole in the tangent sliding plate 3 to be fixedly connected with the tangent mounting plate 2; the sliding plate spring stud 9 is arranged on the tangent sliding plate 3; two ends of the auxiliary return spring 8 are respectively hung on the sliding plate spring stud 9 and the sliding plate stud 7; the sliding plate screw 10 passes through the other long round hole on the tangent sliding plate 3 to be connected with the tangent mounting plate 2; the upper tangent line fixed cutter 12 is arranged on the tangent line mounting plate 2 through an upper tangent line fixed cutter screw 11; the upper tangent line movable knife 13 is arranged on the tangent line sliding plate 3 through a movable knife fixing screw 18; the upper thread-cutting means may include an upper thread-cutting plate 14, an upper thread-cutting plate 15 and an upper thread-cutting holder 16, wherein the upper thread-cutting plate 14, the upper thread-cutting plate 15 are installed between the thread-cutting mounting plate 2 and the upper thread-cutting holder 16, and a tight connection therebetween is achieved by a first screw 17, the upper thread-cutting plate 15 corresponds to a spring for pressing the upper thread-cutting plate 14 against the surface of the upper thread-cutting movable blade 13, and the upper thread-cutting plate 14 cooperates with the upper thread-cutting movable blade 13 to clamp the thread. The front end of the tangent mounting plate 2 is provided with a guide groove 2-1, and the movable upper tangent knife 13 can slide in the guide groove 2-1 in a reciprocating way.

The upper trimming device 49 operates as follows: when the sewing is finished, the needle of the sewing machine is in the upper needle stop position, and the thread releasing electromagnet of the driver 19 acts to open the thread clamping sheets 26 of the upper thread clamp and the bottom thread clamp 25 to realize the thread releasing function. After the thread is loosened, the upper thread cutting driving electromagnet 1 rotates to drive the thread cutting driving plate 6 to swing, so that the upper thread cutting movable knife 13 arranged at the head of the thread cutting sliding plate 3 slides in the guide groove 2-1 at the head of the thread cutting mounting plate 2. The upper tangent line movable knife 13 hooks the suture to move towards the upper tangent line fixed knife 12, and the suture is cut under the action of the upper tangent line fixed knife 12 and the upper tangent line movable knife 13. One section of the cut suture is separated from the upper cut movable knife 13 and the upper cut fixed knife 12, and the other section of the cut suture is clamped under the action of the upper cut clamping plate 14, the upper cut pressing plate 15 and the upper cut clamping plate 14 so as to prevent the suture from being separated in the next sewing process. When the wire is cut, the auxiliary return spring 8 is compressed, and after the wire is cut, the return spring in the upper wire cutting driving electromagnet 1 and the auxiliary return spring 8 act simultaneously to enable the upper wire cutting movable knife 13 to return to the initial position, so that the upper wire cutting action is completely finished. It is understood that the returning mode of the upper tangent movable blade 13 is not limited to the auxiliary return spring 8, and the returning mode may be other modes.

The lower thread cutting device 50 is used to cut the lower thread and clamp the remaining lower thread. There are various options for the structure of the lower slitting device 50, and in one embodiment, referring to fig. 10 to 13, the lower slitting device 50 comprises: the bottom line clamping seat 32 is provided with a sliding groove, the lower cutting line movable knife driving plate 31 is arranged in the sliding groove, the lower cutting line driving assembly drives the lower cutting line movable knife driving plate 31 to move along the sliding groove, the lower cutting line movable knife 30 is provided with a hook body used for hooking the bottom line and fixed on the lower cutting line movable knife driving plate 31, the lower cutting line fixed knife 36 is positioned on the first side of the lower cutting line movable knife 30 and fixed in the sliding groove, and the lower cutting line clamping component is tightly attached to the second side of the lower cutting line movable knife 30 and fixed on the bottom line clamping seat 32.

In the actual assembling process, the lower tangent line driving assembly may specifically adopt an electromagnet, a stepping motor, or an air cylinder, and the like, and the lower tangent line driving assembly specifically adopts the lower tangent line electromagnet 28 as an example. The lower tangent line electromagnet mounting plate 29 is connected with the lower tangent line driving electromagnet 28 through a third nut 35, and the nut 35 is matched with a screw rod on the lower tangent line driving electromagnet 28; a first end of the lower wire cutting cutter driving plate 34 is provided with a mounting hole and a strip-shaped gap for adjusting the sectional area of the mounting hole, the mounting hole is matched with a mounting rod on the lower wire cutting driving electromagnet 28, the width of the strip-shaped gap is adjusted through a third driving plate fastening screw 43 and a fourth nut 44, and then the mounting hole is in interference fit with the electromagnet mounting rod; a second end of the lower tangent line cutter driving plate 34 is provided with a long circular hole which is sleeved on a mounting column of the lower tangent line movable cutter driving plate 31; the bobbin thread clamping seat 32 is connected with the lower thread cutting electromagnet mounting plate 29 through a second screw 45, a mounting groove and a long round hole are formed in the bobbin thread clamping seat 32, the lower thread cutting movable knife driving plate 31 is mounted in the mounting groove of the bobbin thread clamping seat 32, the lower thread cutting movable knife driving plate 31 is provided with a mounting column, and the mounting column penetrates through the long round hole in the bobbin thread clamping seat 32 and the long round hole in the second end of the lower thread cutting knife driving plate 34; the lower tangent line movable knife 30 is connected with the lower tangent line movable knife driving plate 31 through a third screw 37; the lower tangent line fixed knife 36 is arranged in the mounting groove of the bobbin thread clamping seat 32 through a lower tangent line fixed knife screw 33; the lower tangent line clamp part may include a lower tangent line clamp plate 38, a lower tangent line clamp plate 39 and a lower tangent line clamp seat 40, wherein the lower tangent line clamp plate 38, the lower tangent line clamp plate 39 are installed between the lower tangent line electromagnet mounting plate 29 and the lower tangent line clamp seat 40, and the connection is achieved through a fourth screw 42.

The working principle of the lower slitting device 50 is as follows: after sewing, the needle is at the upper needle stop position, the curved needle 51 is at the leftmost end, a thread loop is arranged at the curved needle hole, the bottom thread is in a tension loop state, and the driver 19 acts to open the thread clamping sheets 26 of the upper thread clamp and the bottom thread clamp 25 to realize the thread loosening function. After the thread is loosened, the lower thread cutting driving electromagnet 28 rotates to drive the lower thread cutting knife driving plate 34 to swing so that the lower thread cutting movable knife driving plate 31 slides in the mounting groove and the long round hole of the bottom thread clamping seat 32, and further indirectly drives the lower thread cutting movable knife 30 to slide in the mounting groove of the bottom thread clamping seat 32; the lower tangent line movable knife 30 hooks the suture to move towards the lower tangent line fixed knife 36, the suture can be cut off under the action of the lower tangent line movable knife 30 and the lower tangent line fixed knife 36, one section of the cut suture can be separated from the lower tangent line movable knife 30 and the lower tangent line fixed knife 36, and the other section of the cut suture can be clamped under the action of the lower tangent line movable knife 30, the lower tangent line clamp plate 38 and the lower tangent line clamp plate 39 so as to prevent the suture from being separated when the suture is sewn next time. After the suture is cut, the lower tangent movable knife 30 returns to the initial position along the opposite direction of the original movement under the action of the reset spring arranged in the lower tangent driving electromagnet 28. At this point, the wire cutting operation is completed.

The position adjusting mechanism 53 is used to adjust the position of the upper thread severing device 49 so that the upper thread severing device 49 can cut a thread closely to the fabric. In one embodiment, referring to fig. 3, the position adjustment mechanism 53 includes three adjustment plates, i.e., an up-down adjustment plate 46, a left-right adjustment plate 47, and an angle adjustment plate 48, which are respectively provided with vertically, horizontally, and obliquely distributed kidney-shaped holes; wherein, the included angle between the oblique direction and the horizontal direction is 45 degrees. During actual assembly, the shell of the chain type lockstitch sewing machine, the three adjusting plates and the upper thread cutting device 49 are connected through bolts in the kidney-shaped holes in sequence. The position of the upper thread cutting device 49 relative to the machine shell can be adjusted through the three adjusting plates, so that the thread cutting position and the time of the upper thread can be accurately adjusted, and the thread hooking accuracy and the thread cutting stability of the upper thread cutting device 49 are guaranteed.

In the present embodiment, the position adjusting mechanism 53 is provided in consideration of the fact that the position of the upper thread cutting device 49 needs to be adjusted when the model number of the sewing machine changes. In other embodiments, the position adjustment mechanism 53 may be omitted, for example, if the upper trimming device 49 position does not need to be changed.

As can be seen from the above embodiment, the chain type lockstitch sewing machine provided by the application has the beneficial effects that: after sewing is finished, the upper thread cutting movable knife 13 is used for hooking the upper thread and the lower thread cutting movable knife 30 is used for hooking the bottom thread in cooperation with the thread loosening effect of the driver 19, the thread is cut under the action of the upper thread cutting fixed knife 12 and the lower thread cutting fixed knife 36, meanwhile, the residual cut thread is clamped, the next seam starting and thread falling are prevented, the upper thread and the bottom thread can be cut off in the sewing process in the thread cutting mode, and thread ends after thread cutting are more attractive and are free of braid generation.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The chain type flat sewing machine provided by the utility model is described in detail. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (8)

1. A chain type flat sewing machine is characterized by comprising an upper thread cutting device (49), a lower thread cutting device (50), a thread loosening controller (52), an upper thread gripper for controlling the tightness degree of an upper thread, and a bottom thread gripper (25) for controlling the tightness degree of a bottom thread; when receiving a thread cutting instruction, the thread loosening controller (52) controls the upper thread gripper and the lower thread gripper (25) to simultaneously loosen threads, controls the upper thread cutting device (49) to cut off and clamp the upper threads loosened from the fabric, and controls the lower thread cutting device (50) to cut off and clamp the lower threads loosened from the looper (51).

2. The chain type flat sewing machine according to claim 1, further comprising a position adjusting mechanism (53) for adjusting the position of the upper thread cutting device (49) so that the upper thread cutting device (49) is closely attached to the fabric thread cutting.

3. The chain type lockstitch sewing machine according to claim 2, wherein the position adjusting mechanism (53) comprises three adjusting plates, the three adjusting plates are respectively provided with waist-shaped holes which are distributed horizontally, vertically and obliquely, and the machine shell of the chain type lockstitch sewing machine, the first adjusting plate, the second adjusting plate, the third adjusting plate and the upper thread cutting device (49) are connected in sequence through bolts in the waist-shaped holes.

4. Chain lockstitch machine according to claim 1, characterized in that the lower thread cutting device (50) comprises: bobbin thread clamping seat (32) with spout, locate lower tangent line movable knife drive plate (31), the drive in the spout lower tangent line movable knife drive plate (31) are followed the lower tangent line drive assembly that the spout removed, be equipped with the coupler body that is used for the hook to get the bobbin thread and be fixed in lower tangent line movable knife (30) of lower tangent line movable knife drive plate (31), be located lower tangent line movable knife (30) first side just is fixed in lower tangent line fixed knife (36), hug closely in the spout lower tangent line movable knife (30) second side just is fixed in the lower tangent line fastener spare of bobbin thread clamping seat (32).

5. Chain lockstitch machine according to claim 4, characterized in that the upper thread severing device (49) comprises: the thread cutting device comprises a tangent mounting plate (2), a tangent sliding plate (3) attached to the tangent mounting plate (2), an upper thread cutting driving assembly driving the tangent sliding plate (3) to move linearly, an upper thread cutting movable knife (13) provided with a hook body for hooking a thread taking surface and fixed on the tangent sliding plate (3), an upper thread cutting fixed knife (12) located on the first side of the upper thread cutting movable knife (13) and fixedly connected with the tangent mounting plate (2), and an upper thread cutting assembly tightly attached to the second side of the upper thread cutting movable knife (13) and fixed on the tangent mounting plate (2).

6. The chain type flat bed sewing machine according to claim 5, characterized in that the tangent slide plate (3) is provided with a strip-shaped hole, the tangent slide plate (3) is connected with the tangent mounting plate (2) through a slide plate stud (7) passing through the strip-shaped hole, a slide plate spring stud (9) is provided on the tangent slide plate (3), and an auxiliary return spring (8) is connected with the slide plate stud (7) at one end and with the slide plate spring stud (9) at the other end.

7. The chain type lockstitch sewing machine according to any one of claims 1 to 6, wherein the upper thread gripper and the lower thread gripper (25) each comprise two thread gripping pieces (26) and a rotatable thread releasing shaft (23), and the thread releasing shaft (23) is provided with a thread releasing claw (24) which can rotate with the thread releasing shaft (23) and extends between the corresponding two thread gripping pieces (26); the upper thread gripper the thread releasing shaft (23) and the bottom thread gripper (25) are the same rotating shaft.

8. The chain lock flat sewing machine of claim 7, wherein the thread slacking controller (52) comprises a driver (19) and a thread slacking driving plate (22), the thread slacking driving plate (22) being fixedly connected at one end to the thread slacking spool (23) and at the other end to a driving end of the driver (19).

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