CN114717762A - Facial line centre gripping actuating mechanism and embroidery machine - Google Patents

Abstract

The invention discloses an upper thread clamping driving mechanism, which comprises a driver, a driving rod and a transmission arm, wherein the driving rod is connected with the driver; the driver is arranged on a head shell of the embroidery machine; the driving rod is driven by the driver to move telescopically; the arm body of the transmission arm is provided with a rotary connecting part and is rotatably connected to a machine head shell of the embroidery machine; the first end of the transmission arm is transmitted by the driving rod; the second end part of the transmission arm is used for transmitting a mandril of the upper thread clamping mechanism; the handpiece housing is provided with a vertically extending needle bar drive shaft located between the first and second ends of the drive arm. The invention also discloses an embroidery machine with the upper thread clamping driving mechanism. The invention has the advantages of improving the driving running stability, reducing the abrasion of embroidery threads, simple structure and low cost.

Description

Facial line centre gripping actuating mechanism and embroidery machine

Technical Field

The invention relates to an upper thread clamping driving mechanism and an embroidery machine, which are applied to the technical field of embroidery machines.

Background

In the existing embroidery machine needle bar frame, needle bars are all provided with an upper thread clamping mechanism, when the needle bars perform embroidery, the upper thread clamping mechanism allows embroidery threads to pass through the upper thread clamping mechanism, and when the needle bars stop embroidering, the upper thread clamping mechanism clamps and fixes the embroidery threads, so that the embroidery threads cannot be continuously conveyed downwards.

For example, prior art publication No. CN205907487U discloses an embroidery machine casing with a built-in upper thread clamping driver, a linear driving upper thread clamping driver is arranged in an installation hole of the upper thread clamping driver, the upper thread clamping driver comprises an electromagnet linear driving ejector rod, the electromagnet is installed on an electromagnet seat, a guide groove for guiding the ejector rod is arranged on the electromagnet seat, the ejector rod and the electromagnet are connected through an installation block, a guide pin is arranged on the installation block, and the guide pin is matched with and connected with the guide groove on the electromagnet seat.

For example, the prior art publication No. CN207130460U discloses an upper thread clamping device of an embroidery machine, wherein a driving rod pushing mechanism includes an electromagnet mounting seat arranged on a machine head, an electromagnet is arranged on the electromagnet mounting seat, and an iron core of the electromagnet is connected with a driving rod pushing plate.

Above two prior art all disclose facial line centre gripping actuating mechanism, be used for driving facial line clamping mechanism, be subject to the comparatively narrow and small installation space of embroidery machine aircraft nose, in order to avoid causing mechanical interference, the one end that these two actuating mechanism's transmission arm (ejector pin, actuating lever push pedal) are used for promoting is not on the axis of actuating lever (the iron core of electro-magnet), consequently these two kinds of actuating mechanism are when the operation drive, the transmission arm can receive the reaction force and act on the actuating lever, there is certain contained angle in the direction of this reaction force and the axial of actuating lever, thereby cause to produce along its radial component force to the actuating lever. The radial component force can increase the frictional resistance on the driving rod, thereby affecting the stability of the telescopic motion of the driving rod and even causing the situation that the driving rod is clamped; also, the radial force component may cause the drive rod to gradually wear and become easily broken.

The prior art has technical problems not only in the upper thread clamping driving mechanism, but also in the upper thread clamping mechanism.

For example, prior art publication No. CN209602790U discloses a facial line clamping device for an embroidery machine, which includes a thread clamping seat and a thread pressing strip both having a length structure, the cross section of the thread clamping seat forms a U-shaped structure, the thread pressing strip is disposed in the U-shaped groove of the thread clamping seat and is disposed by abutting against the rear groove wall of the U-shaped groove, the thread clamping seat and the thread pressing strip are movably passed through by a row of movable ejector rods, the row of movable ejector rods are arranged along the length direction of the thread clamping seat, a movable press block is sleeved on one section of movable ejector rod located in the U-shaped groove, a telescopic spring is sleeved on the movable ejector rod exposed outside the thread clamping seat, the front end of the telescopic spring abuts against the thread clamping seat, the rear end of the telescopic spring abuts against an ejector rod boss on the movable ejector rod, a row of thread passing holes are disposed on the top of the thread clamping seat, and a thread passing porcelain sleeve is sleeved in the thread passing holes.

During the use, need to penetrate the embroidery thread in the trapping mechanism from crossing the line porcelain bushing for the embroidery thread is worn out the trapping mechanism from the line ball rectangular and removing between the briquetting, owing to the unable condition in observing the trapping mechanism, and the embroidery thread curls easily if touching the line ball rectangular or remove the briquetting in the trapping mechanism, consequently leads to the operation not too simple and convenient, and this facial line clamping device's overall structure is comparatively complicated in addition, and it is more to constitute spare part, and it is comparatively troublesome during the maintenance to overhaul, and the cost is also comparatively higher.

For example, prior art publication No. CN214422885U discloses an upper thread holding structure, which includes a holder, a thread pressing piece, a push rod and a spring, wherein the thread pressing piece is disposed on the holder, the push rod is disposed along the front-back direction, the front end of the push rod is connected to the thread pressing piece, and the spring is sleeved outside the push rod.

Referring to fig. 6 of the patent of the invention, the top end of the thread pressing piece of the upper thread clamping structure is horizontally bent and is provided with a groove allowing embroidery threads to pass through, and the edge of the groove is sharp due to the sheet structure of the thread pressing piece, so that the embroidery threads are easily cut or even cut off, and the embroidery quality is poor and the embroidery is interrupted. In addition, the embroidery machine can vibrate during operation to enable the ejector rod to rotate around the axis of the ejector rod, the thread pressing piece is poor in positioning effect and easy to rotate along with the ejector rod, and therefore the conveying state of embroidery threads is affected.

Disclosure of Invention

The invention aims to provide an upper thread clamping driving mechanism and an embroidery machine, which can improve the driving running stability, reduce the abrasion of embroidery threads, have simple structure and low cost.

The invention is realized by the following technical scheme.

An upper thread clamping and driving mechanism comprises a driver, a driving rod and a transmission arm; the driver is arranged on a head shell of the embroidery machine; the driving rod is driven by the driver to move telescopically; the arm body of the transmission arm is provided with a rotary connecting part and is rotatably connected to a machine head shell of the embroidery machine; the first end of the transmission arm is transmitted by the driving rod; the second end part of the transmission arm is used for transmitting the ejector rod of the upper thread clamping mechanism.

As a further development of the invention, the handpiece housing is provided with a vertically extending needle bar drive shaft which is located between the first end and the second end of the transmission arm.

As a further improvement of the present invention, the rotation connecting portion and the first end portion of the transmission arm are located on the same side of the needle bar drive shaft.

As a further improvement of the present invention, a portion of the transmission arm between the rotation connecting portion and the second end portion is formed with a curved section that avoids the needle bar drive shaft.

As a further improvement of the invention, the transmission arm is provided with a sliding groove extending along the arm body near the first end part, and the driving rod is provided with a shaft piece which passes through the sliding groove and can slide along the sliding groove; the sliding groove is used for being in transmission connection with the driving rod and preventing the driving rod from rotating around the shaft of the driving rod.

As a further improvement of the invention, the sliding groove is opened at a first end, and the shaft member is fixedly connected to the driving rod; or the sliding groove is a closed groove, and the shaft part is detachably connected to the driving rod; alternatively, the sliding groove is opened at the first end, and the shaft member is detachably coupled to the driving lever.

As a further development of the invention, the drive is designed as an electromagnetic drive.

An embroidery machine comprises a machine head shell, a needle bar frame arranged on the front surface of the machine head shell, an upper thread clamping and driving mechanism and an upper thread clamping mechanism; the needle bar frame is provided with a needle bar which extends vertically; the upper thread clamping mechanism comprises an upper thread clamping plate, an ejector rod, a thread passing structure and an upper thread clamping sheet; the upper thread clamping plate is arranged on the front surface of the needle bar frame; the thread passing structure is arranged on the front surface of the upper thread clamping plate and is provided with a thread passing groove for allowing embroidery threads to pass through; the ejector rod penetrates through the needle rod frame and the upper thread clamping plate, the upper thread clamping sheet is arranged at the front end of the ejector rod, and the rear end of the ejector rod is driven by the second end part of the driving arm; the ejector rod can move along the axial direction of the ejector rod, so that the upper thread clamping piece and the upper thread clamping plate clamp or loosen embroidery threads.

As a further improvement of the invention, the upper part of the needle bar frame is provided with a thread take-up lever for guiding embroidery thread; the thread take-up lever and the ejector rod are located on the same side of the needle rod.

As a further improvement of the invention, the second end part of the transmission arm is used for pushing the ejector rod to move forwards along the axial direction so that the upper thread clamping sheet and the upper thread clamping plate loosen embroidery threads; the ejector rod is provided with an elastic reset structure and is used for driving the ejector rod to reset so that the upper thread clamping piece and the upper thread clamping plate clamp the embroidery thread.

As a further improvement of the invention, the upper thread clamping piece is provided with a limiting groove which is penetrated by the thread passing structure and is used for preventing the upper thread clamping piece from rotating around the mandril.

As a further improvement of the present invention, the wire passing structure comprises a first support arm and a second support arm which are spaced from each other, and the wire passing groove is formed between the first support arm and the second support arm; and in the normal working stroke range of the ejector rod moving along the axial direction of the ejector rod, the first supporting arm always keeps a state of penetrating through the limiting groove.

As a further improvement of the invention, the ejector rod moves forwards along the axial direction, the upper thread clamping piece is separated from the second support arm, and a gap is formed between the upper thread clamping piece and the second support arm, so that embroidery threads can fall into the thread passing groove from the outside of the thread passing structure; or the ejector rod moves forwards along the axial direction, the second support arm does not separate from the space defined by the limiting groove, and gaps can be formed between the second support arm and the four groove walls of the limiting groove, so that the embroidery thread can be buckled into the thread passing groove from the outside of the thread passing structure by abutting against the end part of the second support arm.

As a further improvement of the invention, a sliding slope gradually converging towards the end part of the second support arm is formed on one side of the second support arm far away from the wire passing groove.

As a further improvement of the present invention, the wire passing structure is provided as a member made of ceramic or hardened steel.

The invention has the beneficial effects that:

1. the invention can greatly reduce the radial acting force on the driving rod by arranging the driving arm and utilizing the lever principle, thereby improving the running stability of the driving rod and avoiding the situations of overlarge friction resistance, jamming and breaking.

2. The invention can shorten the stroke of the driving rod by arranging the first end part, the second end part and the rotary connecting part, thereby reducing the overall length of the driver and being beneficial to the installation and arrangement in narrow space; the rotation amplitude of the transmission arm can be reduced, so that the direction change amplitude of the acting force applied to the driving rod is small, and the driving operation stability is improved.

3. The driving rod is provided with the shaft piece which penetrates through the sliding groove of the transmission arm, so that the limiting effect can be achieved, the driving rod is prevented from rotating around the axis of the driving rod, friction is reduced, and stability is further improved.

4. The invention can avoid the phenomenon of jumping off due to the mechanical vibration of the embroidery machine when the embroidery thread is clamped by the position layout of the ejector rod, the needle rod and the thread take-up rod.

5. The upper thread clamping sheet and the upper thread clamping plate are driven by the ejector rod to clamp or loosen embroidery threads, and compared with the prior art, the upper thread clamping device is simpler in overall structure and lower in cost.

6. The thread structure of the invention is not easy to damage the embroidery thread, the structure of the first support arm and the second support arm is convenient for the embroidery thread to fall into the thread passing groove, and the operation is more convenient.

Drawings

The preferred embodiments of the present invention will hereinafter be described in detail to facilitate understanding of the objects and advantages of the invention, with reference to the accompanying drawings, in which:

FIG. 1 is a schematic structural view of an embroidering machine;

FIG. 2 is a schematic view of the head housing and needle bar holder in a split configuration;

FIG. 3 is a mechanism diagram of the head case and the upper thread holding drive mechanism;

FIG. 4 is a schematic structural view of the upper thread holding drive mechanism;

FIG. 5 is a schematic view of a first embodiment of a drive connection of a drive arm and a drive rod;

FIG. 6 is a schematic view of a second embodiment of a drive connection of a drive arm and a drive rod;

FIG. 7 is a schematic view of a third embodiment of a drive connection of a drive arm and a drive rod;

FIG. 8 is a schematic front view of the needle bar holder;

FIG. 9 is a schematic structural view of the upper thread holding means;

FIG. 10 is a schematic top view of the upper thread holding means;

fig. 11 is a schematic structural diagram of a wire-passing structure.

Detailed Description

The invention is explained in more detail below with reference to the drawings and exemplary embodiments.

The terms of orientation of up, down, left, right, front, back, top, bottom, and the like as referred to or as may be referred to in this specification are defined with respect to the configuration shown in the drawings, and the terms "inner" and "outer" refer to directions toward and away from the geometric center of a particular component and are relative terms, and thus may be changed accordingly depending on the position and the state of use of the particular component. Therefore, these and other directional terms should not be construed as limiting terms.

Referring to fig. 1 and 2, an embroidery machine includes a head case 3, a needle bar frame 4, an upper thread holding driving mechanism 1, an upper thread holding mechanism 2; the needle bar frame 4 is arranged on the front surface of the machine head shell 3, a vertically extending needle bar 41 is assembled on the needle bar frame 4, and an embroidery needle is assembled at the bottom end of the needle bar 41 for embroidery. In one embodiment, the embroidery machine performs multicolor embroidery, so that the needle bar housing 4 is assembled with a plurality of needle bars 41 arranged side by side in the left and right direction, and a slide rail 31 extending in the left and right direction is provided on the front surface of the head housing 3, and the needle bar housing 4 is slidably assembled on the slide rail 31, so that the needle bars 41 can be replaced by moving laterally in the left and right direction. In another embodiment, the embroidery machine performs single-color embroidery, so that the needle bar holder 4 is provided with a needle bar 41, and the needle bar holder 4 is fixedly or detachably connected with the head housing 3.

The head shell 3 is provided with a vertically extending needle bar driving shaft 32, a needle bar connecting structure 33 is arranged on the needle bar driving shaft 32, and the needle bar connecting structure 33 is connected with a needle bar 41 on a needle bar frame 4, so that the needle bar 41 is driven to move up and down to embroider.

The needle bar frame 4 is provided with the upper thread clamping mechanism 2 corresponding to the middle lower part of the needle bar 41, and the machine head shell 3 is provided with the upper thread clamping driving mechanism 1. The upper thread clamping and driving mechanism 1 is used for driving the upper thread clamping mechanism 2 to move, so that the upper thread clamping mechanism 2 can clamp or release embroidery threads, and when the needle rod 41 performs embroidery, the upper thread clamping mechanism 2 releases the embroidery threads, so that the embroidery threads can be conveyed to an embroidery needle from top to bottom for embroidery; when the needle bar 41 stops, the upper thread holding mechanism 2 holds the embroidery thread, thereby preventing the embroidery thread from being conveyed downwards or jumping.

Referring to fig. 3 and 4, the upper thread holding driving mechanism 1 includes a driver 11, a driving rod 12, and a driving arm 13, wherein the driver 11 is disposed on the handpiece housing 3, the driving rod 12 is assembled on the driver 11 and driven by the driver 11 to be capable of telescopic movement, the arm body of the driving arm 13 is provided with a rotation connecting portion 133, the rotation connecting portion 133 is rotatably connected to the handpiece housing 3, two ends of the rotation arm are respectively marked as a first end portion 131 and a second end portion 132, wherein the first end portion 131 is driven by the driving rod 12, and the second end portion 132 is used for driving the push rod 22 of the upper thread holding mechanism 2, and the push rod is as described below. More specifically, the head housing 3 is a hollow housing having a bottom plate 3-1, left and right side plates 3-2, and a top frame structure, the bottom plate 3-1 and the left and right side plates 3-2 are substantially in a flat plate structure, and the bottom plate 3-2 is inclined upward from the front to the rear. A vertical shaft is fixed to the bottom plate 3-1 near the front end, and the rotation connecting portion 133 of the transmission arm 13 is sleeved on the shaft and can rotate around the shaft in a horizontal plane.

In prior art, the driving arm (electro-magnet ejector pin or actuating lever push pedal) all is direct fixed connection on actuating lever (iron core) of driver (electro-magnet), because the driving arm slope in the actuating lever, consequently make the position of driving arm effect on the ejector pin not on the axis of iron core, when promoting the ejector pin and move forward, reaction force or the radial component force of iron core is followed in the production to the iron core, therefore when the actuating lever was ordered about along axial displacement by the driver, can produce frictional resistance, thereby influence the axial path of motion of actuating lever, can improve the loss degree of actuating lever, also can make it take place bending deformation more easily, thereby the condition that the actuating lever is blocked thereby can't drive the ejector pin appears still can appear even appear.

Therefore, in response to this technical problem, the transmission arm 13 of the present application utilizes the principle of leverage, transmits the reaction force generated by the carrier rod 22 to the first end 131 when driving, and applies a force to the driving lever 12, the direction of the force is perpendicular to the line connecting the first end 131 to the rotation connecting portion 133, and the direction will change with the rotation of the driving arm 13, but the stroke distance required by the push rod 22 is shorter, so that the amplitude of the rotation of the driving arm 13 is smaller, the direction of the force exerted by the first end 131 on the drive rod 12 is therefore very slightly offset from the axial direction of the drive rod 12, i.e. the radial component of the force exerted by the first end 131 of the transmission arm 13 on the driving rod 12 is very small with respect to the prior art, therefore, the axial movement of the driving rod 12 is not influenced, and the problems of damage, clamping and the like caused by overlarge friction can be avoided.

Since the needle bar connecting structure 33 on the needle bar driving shaft 32 needs to be able to connect or disconnect with the needle bar 41, a driving mechanism is also needed to be arranged in the handpiece housing 3 for driving the needle bar connecting structure 33 to connect or disconnect with the needle bar 41, and a main shaft (not shown in the figure) is transversely arranged in the left and right of the middle part of the handpiece housing 3, so that the handpiece housing 3 only has a space for installing the driving mechanism on the left and right sides of the needle bar driving shaft 32, taking fig. 3 as an example, the driving mechanism is arranged on the left side of the needle bar driving shaft 32 and fixed on a side plate on the left side of the handpiece housing 3. Therefore, there is a space for mounting the needle thread holding drive mechanism 1 only on the right side of the needle bar drive shaft 32. Of course, the two mounting positions can be interchanged. The transmission arm 13 needs to have a certain length, and if the length of the transmission arm 13 is too short, the space on the needle bar drive shaft 32 side is also extremely limited, and the space in which all of the first end 131, the second end 132, and the rotation connecting portion 133 of the transmission arm 13 are provided on the needle bar drive shaft 32 side is not only prone to mechanical interference but also troublesome to assemble.

Therefore, the needle bar drive shaft 32 is located between the first end 131 and the second end 132, i.e., the first end 131 and the second end 132 are located on the left and right sides of the needle bar drive shaft 32, respectively.

First, the first end portion 131 and the second end portion 132 of the transmission arm 13 can be prevented from being disposed in the same narrow space, thereby eliminating the risk of mechanical interference.

Next, the acting force applied to the first end portion 131 is denoted as F1, the moment arm between the first end portion 131 and the rotary connecting portion 133 is denoted as L1, the acting force applied to the second end portion 132 is denoted as F2, the moment arm between the second end portion 132 and the rotary connecting portion 133 is denoted as L2, and if the push rod 22 is to clamp or release the embroidery thread, the acting force and the axial moving distance have the minimum threshold value, and correspondingly, the basic length of the transmission arm 13 is satisfied, the sizes of L1 and L2 are also appropriately enlarged, and the rotating amplitude of the transmission arm 13 can be appropriately reduced when the axial moving distance of the push rod is not less than the minimum threshold value, so that the direction of the acting force applied to the driving rod 12 by the first end portion 131 changes less, and the stability of the telescopic movement of the driving rod 12 can be further improved.

Still further, the rotation connecting portion 133 and the first end portion 131 of the transmission arm 13 are located on the same side of the needle bar drive shaft 32, and taking fig. 3 as an example, the rotation connecting portion 133 is located on the right side of the needle bar drive shaft 32. After the length of the actuator arm 13 is determined, the size of L1 can be enlarged as appropriate, and the size of L2 can be enlarged as appropriate. According to F1 × L1= F2 × L2, in the case where F2 needs to satisfy the minimum threshold, increasing L2 by L1 decreases F1, which increases the power strength requirement of the driver 11 correspondingly, which is acceptable for the present application. The size of the arc-shaped path formed by the rotation of the first end portion 131 and the second end portion 132 around the rotation connecting portion 133 is proportional to the size of L1 and L2, so that the extension and retraction stroke of the driving rod 12 is correspondingly shortened, and the overall length of the driver 11 can be shortened, which is very beneficial for optimizing the arrangement of the driver 11 in a narrow space.

The portion of the transmission arm 13 between the rotation connecting portion 133 and the second end portion 132 is formed with a curved section 13A that avoids the needle bar drive shaft 32. On one hand, the bent section 13A is provided to avoid mechanical interference of the driving arm 13 with the needle bar driving shaft 32 during rotation; on the other hand, the entire extension of the driving arm 13 may be made as far as possible in the left-right direction so that the portion between the rotation connecting portion 133 and the first end portion 131 is substantially perpendicular to the driving lever 12.

The actuator 11 is an electromagnetic actuator, and the actuator 11 is powered on to drive the driving rod 12 by magnetic force.

The lower part of the handpiece shell 3 is provided with an installation shell 3-3 for installing the driver 11, and one part of the driver is positioned in the handpiece shell 3 and the other part is positioned outside the handpiece shell 3 in space, so that the space in the handpiece shell 3 can be effectively utilized, and the installation shell 3-3 can be prevented from occupying too much space outside the handpiece shell 3, thereby avoiding the risk of mechanical interference. More specifically, the bottom plate of the handpiece housing 3 is provided with a mounting housing 3-3 recessed inwards, so that one part of the mounting housing 3-3 is arranged in the handpiece housing 3, the other part of the mounting housing 3-3 is arranged outside the handpiece housing 3, the driver 11 is arranged in the mounting housing 3-3, and the front end surface of the mounting housing 3-3 is provided with an opening for allowing the driving rod 12 to extend out of the opening and be in transmission connection with the first end 131 of the transmission arm 13. The provision of the mounting housings 3-3 increases the space available for assembly of some of the drives 11 and only partially outside the handpiece housing 3, avoiding mechanical interference. Of course, the mounting housing 3-3 may be detachable, either wholly or partially, to facilitate installation or repair and replacement of the driver 11.

In view of ensuring the smoothness of the telescopic movement of the driving rod 12 and minimizing the frictional resistance, the driving rod 12 is configured as a round rod-shaped structure, and no guide structure is provided between the driving rod 12 and the driver 11, so that the driving rod 12 can rotate around the axis thereof while telescopic movement occurs. To avoid this, it is necessary to limit the rotation of the driving lever 12 about its axis while the driving lever 12 is drivingly connected to the first end 131 of the driving arm 13. In addition, the removal of the drive lever 12 and the drive arm 13 is also facilitated as much as possible, subject to a small space.

Referring to fig. 5, in the first embodiment, the driving arm 13 is provided with a sliding groove 13-j extending along the arm body near the first end 131, and the sliding groove 13-j is formed with an opening at the first end 131, so that the first end 131 of the driving arm 13 has a double-fork structure. The driving rod 12 is formed with a slotted structure 12-k along its extending direction by its end, and the driving arm 13 is inserted into the slotted structure 12-k of the driving rod 12. The driving rod 12 is provided with a shaft member 121, the shaft member 121 can use a pin shaft and pass through the sliding groove 13-j on the driving arm 13, so as to realize a driving connection, and since the shaft member 121 is inserted in the sliding groove 13-j, the driving rod 12 is also limited to prevent the shaft member from rotating around the shaft. The shaft member 121 may be fixed to the driving rod 12, and the driving rod 12 may be inserted or pulled out of the double fork structure of the first end 131 of the driving arm 13 during assembly or disassembly.

Referring to fig. 6, in the second embodiment, the driving arm 13 is provided with a sliding groove 13-j extending along the arm body near the first end 131, and the sliding groove 13-j is a closed groove. The driving rod 12 is formed with a slotted structure 12-k along its extending direction by its end, the driving arm 13 is inserted into the slotted structure 12-k of the driving rod 12, the driving rod 12 is provided with a shaft member 121, and the shaft member 121 can use a pin shaft and passes through a sliding groove 13-j on the driving arm 13, thereby realizing the driving connection. The shaft member 121 is detachably connected to the driving rod 12, and the driving arm 13 and the driving rod 12 can be separated by detaching the shaft member 121 during assembling and disassembling.

Referring to fig. 7, in the third embodiment, the driving arm 13 is provided with a sliding groove 13-j extending along the arm body near the first end 131, and the sliding groove 13-j is a closed groove. The transmission arm 13 and the driving rod 12 are arranged crosswise, the driving rod 12 is provided with a shaft member 121, and the shaft member 121 can use a pin shaft and pass through a sliding groove 13-j on the transmission arm 13, so that transmission connection is realized. The shaft member 121 is detachably connected to the driving rod 12, and the driving arm 13 and the driving rod 12 can be separated by detaching the shaft member 121 during assembling and disassembling.

The three embodiments are the same in that the shaft 121 passes through the sliding groove 13-j to limit the driving rod 12, but the driving rod 12 and the driving arm 13 are detached from each other, and the sliding groove 13-j may be opened at the first end 131 to allow the driving arm 13 to be inserted into or removed from the driving rod 12, or the sliding groove 13-j may be configured as a closed groove to allow the shaft 121 to be detachably connected to the driving rod 12. Of course, both of these two detachable structures may be used together.

Referring to fig. 9 to 11, the upper thread holding means 2 comprises an upper thread holding plate 21, a jack 22, an upper thread holding piece 23, and a thread passing structure 24. Facial line grip block 21 sets up the front of needle bar frame 4, ejector pin 22 level sets up and passes needle bar frame 4 and facial line grip block 21, ejector pin 22's front end fixed connection facial line holding piece 23, its axial reciprocating motion can be followed to ejector pin 22 to make facial line holding piece 23 laminate in facial line grip block 21 the front, perhaps leave facial line grip block 21 the front. The thread passing structure 24 is disposed on the front surface of the upper thread holding plate 21, and has a thread passing groove 24a for allowing the embroidery thread to vertically pass therethrough, so as to limit the position of the embroidery thread and prevent the embroidery thread from shaking during the embroidery process. When the embroidery machine performs embroidery, the ejector rod 22 moves forwards, and the upper thread clamping sheet 23 and the upper thread clamping plate 21 are separated to loosen embroidery thread so that the embroidery thread can be conveyed downwards; when the embroidery machine stops embroidering or the current needle bar stops sewing, the ejector rod 22 moves backwards, and the upper thread clamping piece 23 is attached to the upper thread clamping plate 21 for clamping embroidery thread.

The upper thread clamping mechanism also comprises an elastic reset structure 25 which is used for driving the ejector rod 22 to reset so that the upper thread clamping sheet 23 and the upper thread clamping plate 21 clamp the embroidery thread. More specifically, elasticity canceling release mechanical system adopts reset spring set up on the ejector pin 22 and end structure 21, with the reset spring cover in ejector pin 22 be located the part between ending structure 21 and the upper thread grip block 21 for reset spring's both ends support respectively on ending structure 21 and upper thread grip block 21.

When embroidering, the push rod 22 is pushed by the second end 132 to move forward for releasing the embroidery thread, the return spring is in a compressed state, and when stopping the embroidery thread, the push rod 22 is not acted by the second end 132, and is reset under the elastic force of the return spring for clamping the embroidery thread.

Referring to fig. 8 in combination with fig. 10, a thread take-up lever 42 for guiding embroidery thread is provided at an upper portion of the needle bar frame 4; the thread take-up lever 42 and the ejector pin 22 are located on the same side of the needle bar 41. Since the thread take-up lever 42 can be provided only on one side of the needle bar 41, the portion of the embroidery thread from the thread take-up lever 41 to the upper thread holding mechanism 2 is not erected and is slightly inclined. When the embroidery thread is held, the embroidery thread may be easily jumped off in an inclined direction due to mechanical vibration of the embroidery machine. The push rod 22 and the thread take-up rod 42 are arranged on the same side of the needle rod, so that the connecting part of the push rod 22 and the upper thread clamping sheet 23 is in the embroidery thread jumping direction, and the connecting part of the upper thread clamping sheet 23 and the push rod 22 is the tightest clamping part of the upper thread clamping sheet 23 and the upper thread clamping plate 21, thereby avoiding the embroidery thread jumping.

The upper thread clamping piece 23 is provided with a through limiting groove 23-1, and the thread passing structure 24 passes through the limiting groove 23-1. When the ejector rod 22 moves along the axial direction, the thread passing structure 24 and the limiting groove 23-1 slide relatively, so that the upper thread clamping piece 23 is always in a limited state, the upper thread clamping piece 23 is prevented from rotating around the ejector rod 22, and embroidery threads cannot be interfered in the embroidery process.

The wire passing structure 24 comprises a first support arm 241 and a second support arm 242 which are spaced apart from each other, the wire passing groove 24a is formed between the first support arm 241 and the second support arm 242, and both the first support arm 241 and the second support arm 242 pass through the limiting groove 23-1. The length of the first arm 241 is longer than that of the second arm 242, and within the normal working stroke range of the top rod 22 moving along the axial direction thereof, the first arm 241 always keeps the state of passing through the limiting groove 23-1, and the first arm 241 is used for keeping the wire passing structure 24 always within the limiting range of the limiting groove 23-1, so as to avoid the wire passing structure 24 and the wire holding piece 23 from being separated.

In the prior art, the embroidery thread passes through the upper thread clamping structure from top to bottom, for example, CN209602790U passes through the thread passing porcelain bushing into the thread clamping seat, the threading mode is relatively troublesome in operation, when the used embroidery thread material is softer, the operation difficulty is increased, and in order to solve the technical problem, in the present application, the second arm 242 is shorter in length than the first arm 241, and when the jack 22 is moved forward in the axial direction, the upper thread holding piece 23 is separated from the end of the second arm 242 with a gap formed therebetween, so that the embroidery thread falls into the thread passing groove 24a from the outside of the thread passing structure 24, that is, in this embodiment, the operation difficulty can be reduced, and thereafter, when the jack 22 is in its operating state, by the blocking action of the upper thread holding piece 23, the thread passing grooves 24a are all in a closed state, and embroidery threads are limited in the thread passing grooves 24 a.

Alternatively, the push rod 22 is moved forward in the axial direction, and the second arm 4 is not separated from the space defined by the limiting groove 23-1, that is, the second arm 4 is not separated from the plane clamping piece 23 in the top view, and the second arm 242 and the four groove walls of the limiting groove 23-1 may form a gap. There are several cases, the first: the second arm 242 is not in contact with the wall of the limiting groove 23-1, and since the embroidery thread is made of flexible material, the embroidery thread is attached to the second arm 242, and since there is a gap, the embroidery thread can be fastened into the thread passing groove 24a from the outside of the thread passing structure 24 along the end of the second arm 242. In the second case: one of the upper and lower groove walls of the second arm 242 and the limiting groove 23-1 has a gap, and the upper thread holding piece 23 and the push rod 22 are not completely fixed, and can move relatively to each other to a certain extent, so that when the embroidery thread is buckled, a gap is formed between the second arm 242 and the other groove wall, and the embroidery thread can be buckled into the thread passing groove 24 a.

In order to facilitate the operation of dropping the embroidery thread from the thread passing structure 24 to the thread passing groove 24a, a slope surface 2421 gradually converging towards the end of the second arm 242 is formed on the side of the second arm 242 away from the thread passing groove 24a, and the end of the second arm 242 is in a hook shape bending towards the thread passing groove 24 a.

The front surface of the facial line holding plate 21 is provided with an inward sunken positioning groove 21-1, the positioning groove 21-1 extends along the direction of the facial line holding plate 21 and is in a straight groove structure because the plurality of push rods 22 and the facial line holding pieces 23 share one facial line holding plate 21, the positioning groove 21-1 is used for positioning the thread passing structure 24, and the roots of the first support arm 241 and the second support arm 242 are embedded into the positioning groove 21-1 and fixed on the facial line holding plate 21.

The thread passing structure 24 further comprises a handle portion 243, the handle portion 243 connects the root portions of the first arm 241 and the second arm 242, so that the thread passing structure 24 is a U-shaped structure, and the handle portion 243 is embedded in the positioning groove 21-1 and fixed on the front surface of the upper thread holding plate 21. More specifically, the shank 243 has a bayonet structure which passes through the upper thread holding plate 21 to fix the thread passing structure 24 to the upper thread holding plate 21. The thread passing structure 24 can be fixed to the upper thread holding plate 21 in many ways, and the handle 243 and the roots of the first arm 241 and the second arm 242 can be adhered to the positioning groove 21-1 by using an adhesive.

The wire passing structure 24 is made of ceramic or hardened steel, so that the wire passing structure has the characteristics of smoothness and wear resistance, and the service life can be prolonged to reduce the replacement cost.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments can be modified, or some technical features can be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (15)

1. The facial line clamping and driving mechanism is characterized by comprising a driver, a driving rod and a transmission arm; the driver is arranged on a head shell of the embroidery machine; the driving rod is driven by the driver to move telescopically; the arm body of the transmission arm is provided with a rotary connecting part and is rotatably connected to a machine head shell of the embroidery machine; the first end of the transmission arm is transmitted by the driving rod; the second end part of the transmission arm is used for transmitting the ejector rod of the upper thread clamping mechanism.

2. The needle thread gripping drive mechanism according to claim 1, wherein the head housing is provided with a vertically extending needle bar drive shaft which is located between the first end portion and the second end portion of the transmission arm.

3. The needle thread gripping drive mechanism according to claim 2, wherein the rotation connecting portion and the first end portion of the drive arm are located on the same side of the needle bar drive shaft.

4. The needle thread holding drive mechanism according to claim 3, wherein a portion of the transmission arm between the rotation connecting portion and the second end portion is formed with a curved section which avoids the needle bar drive shaft.

5. The needle thread gripping and driving mechanism according to claim 1, wherein the driving arm is provided with a sliding groove or a through hole extending along the arm body near the first end portion, and the driving rod is provided with a through sliding groove or a through hole; the sliding groove is used for being in transmission connection with the driving rod.

6. The needle thread gripping drive mechanism according to claim 5, wherein the sliding groove or the through hole is opened at a first end portion, and the shaft member is fixedly attached to the drive lever; or the sliding groove or the through hole is of a closed structure, and the shaft part is detachably connected to the driving rod; alternatively, the sliding groove or the through hole is opened at the first end, and the shaft member is detachably coupled to the driving rod.

7. The needle thread gripping drive mechanism according to claim 1, wherein the actuator is an electromagnetic actuator.

8. An embroidery machine comprising a head case, a needle bar holder provided on the front surface of the head case, an upper thread holding drive mechanism as defined in any one of claims 1 to 7, an upper thread holding mechanism; the needle bar frame is provided with a needle bar which extends vertically; the upper thread clamping mechanism comprises an upper thread clamping plate, an ejector rod, a thread passing structure and an upper thread clamping sheet; the upper thread clamping plate is arranged on the front surface of the needle bar frame; the thread passing structure is arranged on the front surface of the upper thread clamping plate and is provided with a thread passing groove for allowing embroidery threads to pass through; the ejector rod penetrates through the needle rod frame and the upper thread clamping plate, the upper thread clamping sheet is arranged at the front end of the ejector rod, and the rear end of the ejector rod is driven by the second end part of the driving arm; the ejector rod can move along the axial direction of the ejector rod, so that the upper thread clamping piece and the upper thread clamping plate clamp or loosen embroidery threads.

9. The embroidery machine as claimed in claim 8, wherein a thread take-up lever for guiding an embroidery thread is provided at an upper portion of the needle bar frame; the thread take-up lever and the ejector rod are located on the same side of the needle rod.

10. The embroidery machine as claimed in claim 8, wherein the second end of the transmission arm is configured to push the push rod to move forward in the axial direction so that the upper thread holding piece and the upper thread holding plate release the embroidery thread; the ejector rod is provided with an elastic reset structure and is used for driving the ejector rod to reset so that the upper thread clamping piece and the thread clamping plate clamp the embroidery thread.

11. The embroidery machine as claimed in claim 8, wherein the upper thread holding piece is provided with a restriction groove through which the thread passing structure passes for preventing the upper thread holding piece from rotating around the push rod.

12. The embroidery machine as claimed in claim 11, wherein said thread passing structure comprises a first arm and a second arm spaced apart from each other to form said thread passing groove therebetween; and in the normal working stroke range of the ejector rod moving along the axial direction of the ejector rod, the first supporting arm always keeps a state of penetrating through the limiting groove.

13. The embroidery machine as claimed in claim 12, wherein the push rod moves forward in an axial direction, and the upper thread holding piece and the second arm are separated from each other with a gap formed therebetween, so that the embroidery thread can fall from outside the thread passing structure into the thread passing groove; or the ejector rod moves forwards along the axial direction, the second support arm does not separate from the space defined by the limiting groove, and gaps can be formed between the second support arm and the four groove walls of the limiting groove, so that the embroidery thread can be buckled into the thread passing groove from the outside of the thread passing structure by abutting against the end part of the second support arm.

14. The embroidery machine as claimed in claim 13, wherein a side of the second arm remote from the thread passing groove is formed with a slope gradually converging toward an end of the second arm.

15. The embroidery machine as claimed in claim 8, wherein the thread passing structure is provided as a member made of ceramic or hardened steel.

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