High-speed pattern sewing machine

Abstract

The utility model discloses a high-speed pattern sewing machine which comprises a machine head and a thread trimming mechanism located below the machine head, and a needle bar mechanism, a thread take-up mechanism and a middle presser foot mechanism are arranged in the machine head. The needle bar mechanism comprises a driving block (20) driven by a first stepping motor; the take-up mechanism comprises a take-up lever (50) which is bent into a V shape, and the upper end of the take-up lever (50) transversely extends out of the machine head; the lower end of the take-up lever (50) is rotationally connected with the driving block (20) through a first deep groove ball bearing (51), a second deep groove ball bearing (52) is arranged at the bent position of the take-up lever (50), a sixth connecting rod (53) is arranged on one side of the take-up lever (50), one end of the sixth connecting rod (53) is hinged to a machine shell (90) of the machine head, and the other end of the sixth connecting rod (53) is connected with an inner hole of the second deep groove ball bearing (52). The utility model has the advantages that the running speed is higher, the threading success can be ensured in the needle raising stage, and the sewing quality is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of high-speed pattern machines. BACKGROUND

[0002] Pattern machine, such as 3020 type, 4030 type or 210D type computer pattern machine, needle bar mechanism, thread take-up mechanism and middle presser foot mechanism are arranged at the position of machine head, needle bar mechanism is used to drive needle to reciprocate up and down, so that sewing thread passes through fabric, thread take-up mechanism is used to keep the delivery and recovery of sewing thread, and can tighten sewing stitch, middle presser foot mechanism is used to press fabric during sewing process.Needle bar mechanism, thread take-up mechanism and middle presser foot mechanism are linked, needle bar mechanism is up and down once, thread take-up mechanism swings up and down once, and middle presser foot mechanism moves up and down once.

[0003] The existing needle bar mechanism includes a driving block driven by a first stepper motor, the first stepper motor is fixed to the machine shell of the machine head, the front side of the driving block is provided with a needle bar in sliding connection with the machine shell, the lower end of the needle bar extends out of the bottom of the machine shell and is connected with a needle, a fifth connecting rod is arranged between the needle bar and the driving block, the upper end of the fifth connecting rod is hinged to the driving block, and the lower end of the fifth connecting rod is hinged to the needle bar.When the driving block rotates, the upper end of the fifth connecting rod rotates around the rotation axis of the driving block, and the lower end of the fifth connecting rod drives the needle bar to reciprocate up and down.

[0004] The existing thread take-up mechanism includes a V-shaped thread take-up lever, the upper end of the thread take-up lever extends transversely out of the machine head and is provided with a through hole for sewing thread, the lower end of the thread take-up lever is hinged to the driving block through a first needle bearing, the bent part of the thread take-up lever is provided with a second needle bearing, one side of the thread take-up lever is provided with a sixth connecting rod, one end of the sixth connecting rod is hinged to the machine shell, and the other end of the sixth connecting rod is connected to the inner hole of the second needle bearing.When the driving block rotates, the lower end of the thread take-up lever rotates around the rotation axis of the driving block, and the upper end of the thread take-up lever swings up and down.

[0005] The existing middle presser foot mechanism includes a lifting rod in sliding connection with the machine shell, the lower end of the lifting rod extends out of the mechanism, a linkage mechanism is arranged between the lifting rod and the driving block, the lower end of the lifting rod is provided with an L-shaped middle presser foot, the end of the middle presser foot is provided with a needle hole matched with the needle, and the needle passes through the needle hole.When the driving block rotates, the lifting rod drives the middle presser foot to reciprocate up and down.

[0006] The bottom of the table plate of the pattern machine, i.e. the bottom of the machine head of the pattern machine is provided with a thread cutting mechanism.The existing thread cutting mechanism includes a circular-arc fixed blade and a circular-arc movable blade, the fixed blade is fixed to the machine frame of the pattern machine, the movable blade is rotatably connected with the machine frame of the pattern machine, the machine frame is provided with a second stepper motor, the output end of the second stepper motor is connected with the movable blade, and the sewing thread passes between the fixed blade and the movable blade.When sewing is finished, the second stepper motor drives the movable blade to rotate towards the fixed blade, so that the sewing thread is cut off.

[0007] The existing pattern machine has the following defects:

[0008] First, with the development of technology, higher requirements are put forward for the running speed of the pattern machine, the existing pattern machine meets the running speed below 2500r / min, that is, the rotating speed of the driving block is below 2500r / min, and it is difficult to continue to improve the rotating speed, which is mainly caused by the two needle bearings on the thread lifting lever, the maximum rotating speed of the needle bearing is low, and the needle bearing is easy to be hot and worn and seized, and it is difficult to meet the higher requirements of the market.

[0009] Secondly, in addition, according to customer feedback, the middle presser foot is linked with the needle, and the needle lifting stage is easy to appear the phenomenon of not lifting the thread, which is mainly caused by the fact that the middle presser foot rises with the needle when the needle rises, and the fabric is not pressed.

[0010] Third, the sewing thread is dragged by the movable blade and has a large transverse displacement near the cutting position, which can cause the residual thread on the fabric to be relatively long. The needle of the pattern machine can bring the residual thread into the lower part of the fabric and interweave with the bottom thread, so that the fabric forms a thread head at the initial end of the lock stitch. In the case that the residual thread is relatively long, the range of interweaving and winding of the residual thread at the bottom of the fabric is large, and a "bird nest" appears, which affects the appearance effect of sewing and reduces the quality of the product.

[0011] In summary, the existing pattern machine has the defects of low running speed, easy not to lift the thread at the needle lifting stage and low sewing quality. Practical new type content

[0012] The purpose of the present application is to provide a high-speed pattern machine. The present application has the advantages of high running speed, successful thread lifting at the needle lifting stage and good sewing quality.

[0013] The technical scheme of the present application is a high-speed pattern machine, which comprises a machine head and a thread cutting mechanism located below the machine head, the machine head is provided with a needle bar mechanism, a thread lifting mechanism and a middle presser foot mechanism; the needle bar mechanism comprises a driving block driven by a first stepping motor; the thread lifting mechanism comprises a thread lifting lever bent into a V shape, the upper end of the thread lifting lever horizontally extends out of the machine head; the lower end of the thread lifting lever is rotatably connected with the driving block through a first deep groove ball bearing, the bent part of the thread lifting lever is provided with a second deep groove ball bearing, one side of the thread lifting lever is provided with a sixth connecting rod, one end of the sixth connecting rod is hinged to the machine shell of the machine head, and the other end of the sixth connecting rod is connected with the inner hole of the second deep groove ball bearing.

[0014] The high-speed pattern machine has the following improvements.

[0015] The high-speed pattern machine has the following improvements.

[0016] The high-speed pattern machine has the following improvements.

[0017] The high-speed pattern machine has the following improvements.

[0018] The high-speed pattern machine has the following improvements.

[0019] The high-speed pattern machine has the following improvements.

[0020] Compared with the prior art, the high-speed pattern machine is improved on the basis of the existing pattern machine, and the improvements include the following.

[0021] 1) The two original needle roller bearings on the thread lifting rod are replaced by deep groove ball bearings, the maximum rotating speed of the deep groove ball bearings is high, and the deep groove ball bearings will not overheat and seize even if the rotating speed reaches 5000r / min, so that the running speed of the pattern machine can be improved.

[0022] 2), the medium pressure foot mechanism is driven by a single step motor, the height of the medium pressure foot can be automatically adjusted by the output signal of the pattern machine control system, the lifting of the medium pressure foot is not linked with the needle, before the needle rises, the medium pressure foot can press the fabric first, ensuring the success of the pattern machine needle rising.

[0023] 3), the original cutting thread mechanism is improved from one fixed blade and one movable blade to two movable blades, the two movable blades rotate towards each other, when cutting the thread, the two sides of the thread are forced at the same time, the thread cannot be dragged horizontally by the blade, the thread left on the fabric after cutting is short, effectively avoiding the "bird nest" on the fabric, and the sewing quality of the fabric can be improved.

[0024] Therefore, the utility model has the advantages of high running speed, needle rising stage can ensure successful threading and good sewing quality. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a front view schematic diagram of the needle bar mechanism, the thread lifting mechanism and the medium pressure foot mechanism.

[0026] Figure 2 is a front view schematic diagram of the thread cutting mechanism.

[0027] Figure 3 is Figure 2 the sectional view at A-A.

[0028] Figure 4 is a top view schematic diagram of the thread cutting mechanism.

[0029] The marks in the drawings are: 1-first movable blade, 2-second movable blade, 3-rotation shaft, 4-second step motor, 5-limiting plate, 6-first rotating plate, 7-second rotating plate, 8-first connecting rod, 9-second connecting rod, 10-driving plate, 11-seventh connecting rod, 12-fourth connecting rod, 13-thread groove; 20-driving block, 21-first step motor, 22-needle bar, 23-needle, 24-fifth connecting rod, 25-guide sleeve; 50-thread lifting rod, 51-first deep groove ball bearing, 52-second deep groove ball bearing, 53-sixth connecting rod; 70-lifting rod, 71-medium pressure foot, 72-horizontal shaft, 73-seventh connecting rod, 74-eighth connecting rod 74; 90-casing. DETAILED DESCRIPTION

[0030] The utility model will be further described below in combination with the drawings and examples, but it is not as the basis for limiting the utility model.

[0031] Example. A high-speed pattern machine is improved on the basis of the existing pattern machine, comprising a machine head and a thread cutting mechanism located below the machine head, as shown in Figure 1 The machine head is provided with a needle bar mechanism, a thread lifting mechanism and a medium pressure foot mechanism.

[0032] The needle bar mechanism comprises a driving block 20 driven by a first stepper motor 21 fixed to the casing 90 of the machine head, the first stepper motor 21 being connected to the control system of the embroidery machine, the front side of the driving block 20 being provided with a needle bar 22 in sliding connection with the casing 90, the upper end of the needle bar 22 being provided with a guide sleeve 25 connected to the casing 90, the lower end of the needle bar 22 extending out of the bottom of the casing 90 and being connected to a needle 23, a fifth connecting rod 24 being provided between the needle bar 22 and the driving block 20, the upper end of the fifth connecting rod 24 being hingedly connected to the driving block 20, the hinging point being offset from the rotation axis of the driving block 20, the lower end of the fifth connecting rod 24 being hingedly connected to the needle bar 22. The working principle of the needle bar mechanism is that the first stepper motor 21 rotates the driving block 20, the upper end of the fifth connecting rod 24 rotates around the rotation axis of the driving block 20, and the lower end of the fifth connecting rod 24 drives the needle bar 22 to reciprocatingly move up and down.

[0033] The thread tensioning mechanism comprises a V-shaped thread tensioning rod 50, the upper end of the thread tensioning rod 50 extending transversely out of the casing 90 and being provided with a through hole for the thread, the lower end of the thread tensioning rod 50 being rotatably connected to the driving block 20 through a first deep groove ball bearing 51, the bent portion of the thread tensioning rod 50 being provided with a second deep groove ball bearing 52, one side of the thread tensioning rod 50 being provided with a sixth connecting rod 53, one end of the sixth connecting rod 53 being hingedly connected to the casing 90, the other end of the sixth connecting rod 53 being connected to the inner hole of the second deep groove ball bearing 52. The working principle of the thread tensioning mechanism is that when the driving block 20 rotates, the lower end of the thread tensioning rod 50 rotates around the rotation axis of the driving block 20, causing the upper end of the thread tensioning rod 50 to swing up and down, so that the thread tensioning mechanism and the needle bar mechanism remain linked.

[0034] The presser foot mechanism comprises a lifting rod 70 in sliding connection with the casing 90, the lower end of the lifting rod 70 extending out of the mechanism, the lower end of the lifting rod 70 being provided with an L-shaped presser foot 71, the end of the presser foot 71 being provided with a needle hole for cooperating with the needle 23, the needle 23 passing through the needle hole. One side of the upper end of the lifting rod 70 is provided with a horizontal shaft 72, the horizontal shaft 72 being connected to a third stepper motor (omitted in the drawing), the third stepper motor being fixed to the casing 90, the input end of the third stepper motor being connected to the control system of the embroidery machine, the horizontal shaft 72 being rotatably connected to the casing 90, the horizontal shaft 72 being provided with a seventh connecting rod 73 and an eighth connecting rod 74 between the horizontal shaft 72 and the lifting rod 70, one end of the seventh connecting rod 73 being rotatably connected to the horizontal shaft 72, the other end of the seventh connecting rod 73 being rotatably connected to the eighth connecting rod 74, the eighth connecting rod 74 being rotatably connected to the upper end of the lifting rod 70. The working principle of the presser foot mechanism is that the third stepper motor rotates the horizontal shaft 72, the horizontal shaft 72 drives the seventh connecting rod 73 to rotate, the seventh connecting rod 73 drives the lifting rod 70 to move vertically through the eighth connecting rod 74, and the lifting rod 70 drives the presser foot 71 to move up and down.

[0035] The cutting mechanism comprises a first movable blade 1, a second movable blade 2, a rotating shaft 3 and a second stepping motor 4, the first movable blade 1 and the second movable blade 2 are located on the upper two sides of the rotating shaft 3, the first movable blade 1 and the second movable blade 2 are both arc-shaped, the first movable blade 1 and the second movable blade 2 are coaxial with the rotating shaft 3, and the second stepping motor 4 drives the first movable blade 1 and the second movable blade 2 to rotate towards each other. The rotating shaft 3 and the second stepping motor 4 are fixed with the rack of the pattern machine, and the input end of the second stepping motor 4 is connected with the control system of the pattern machine.

[0036] Two limiting plates 5 are arranged on the rotating shaft 3, a first rotating plate 6 and a second rotating plate 7 are arranged between the two limiting plates 5, the first rotating plate 6 and the second rotating plate 7 are coaxially penetrated by the rotating shaft 3, the first rotating plate 6 is connected with the first movable blade 1, and the second rotating plate 7 is connected with the second movable blade 2. The two limiting plates 5 are used to limit the axial positions of the first movable blade 1 and the second movable blade 2.

[0037] A first connecting rod 8 and a second connecting rod 9 are arranged below the rotating shaft 3, a driving plate 10 is arranged at the output end of the second stepping motor 4, the middle part of the driving plate 10 is fixed with the output end of the second stepping motor 4, one end of the first connecting rod 8 is hingedly connected with one end of the driving plate 10, the other end of the first connecting rod 8 is hingedly connected with a third connecting rod 11, the third connecting rod 11 is fixed with the lower part of the first rotating plate 6, one end of the second connecting rod 9 is hingedly connected with the other end of the driving plate 10, the other end of the second connecting rod 9 is hingedly connected with a fourth connecting rod 12, and the fourth connecting rod 12 is fixed with the lower part of the second rotating plate 7.

[0038] A V-shaped wire groove 13 is arranged on the first movable blade 1, the wire groove 13 faces the second movable blade 2, and the outer diameter of the first movable blade 1 matches the outer diameter of the second movable blade 2.

[0039] The first movable blade 1 is screw-connected with the first rotating plate 6, and the second movable blade 2 is screw-connected with the second rotating plate 7.

[0040] The working principle of the cutting mechanism is as follows: Figure 2 and Figure 4As shown, in the initial state, a large gap is reserved between the first movable blade 1 and the second movable blade 2, the thread passes between the first movable blade 1 and the second movable blade 2, and the thread position corresponds to the position of the thread groove 13. When the sewing is completed and the thread needs to be cut, the second stepper motor 4 is started to rotate the driving plate 10 clockwise. The upper end of the driving plate 10 drives the second rotating plate 7 counterclockwise through the second connecting rod 9 and the fourth connecting rod 12, and the second rotating plate 7 drives the second movable blade 2 counterclockwise; the lower end of the driving plate 10 drives the first rotating plate 6 clockwise through the first connecting rod 8 and the third connecting rod 11, and the first rotating plate 6 drives the first movable blade 1 clockwise. The first movable blade 1 and the second movable blade 2 approach each other and simultaneously release the thread, and after the second movable blade 2 passes from the outside of the first movable blade 1, the thread is cut at the thread groove 13.

[0041] In the thread cutting mechanism, the two movable blades are linked in structure and driven by the same motor, so that the number of motors does not increase, thereby the cost increase of the cutting mechanism is small, and the original control system of the pattern machine does not need to be changed in structure, and the adaptive adjustment of the rotation angle of the motor when cutting the thread can be performed on the program, which is convenient for modification and use on the existing pattern machine.

[0042] Compared with the existing pattern machine, the improvements made in the embodiment include only the following:

[0043] Needle bar mechanism: no change, only written in the embodiment for the convenience of describing the thread skipping mechanism.

[0044] Thread lifting mechanism: the original two needle bearings are replaced by deep groove ball bearings, and the rest remains unchanged.

[0045] Middle presser foot mechanism: the linkage mechanism between the original lifting rod 70 and the driving block 20 is cancelled, the lifting of the middle presser foot 71 is controlled by a newly added stepper motor, the distance between the middle presser foot 71 and the needle eye at the lower end of the needle 23 can be adjusted arbitrarily, which facilitates the threading during the needle lifting stage, improves the needle lifting speed, and makes the needle lifting more stable.

[0046] Thread cutting mechanism: the original single moving knife structure is changed to a double moving knife structure, which can avoid forming a "bird nest" on the fabric.

Claims

1. A high-speed pattern machine comprising a machine head and a thread cutting mechanism located below the machine head, the machine head being provided with a needle bar mechanism, a thread lifting mechanism and a presser foot mechanism; the needle bar mechanism comprising a driving block (20) driven by a first stepping motor; the thread lifting mechanism comprising a thread lifting lever (50) bent into a V shape, the upper end of the thread lifting lever (50) extending transversely out of the machine head; characterized in that: The lower end of the thread tension lever (50) is rotatably connected with the driving block (20) through a first deep groove ball bearing (51), and the thread tension lever (50) is provided with a second deep groove ball bearing (52) at the bent portion, and one side of the thread tension lever (50) is provided with a sixth connecting rod (53), one end of the sixth connecting rod (53) is hingedly connected with the machine shell (90) of the machine head, and the other end of the sixth connecting rod (53) is connected with the inner hole of the second deep groove ball bearing (52).

2. The high speed pattern machine according to claim 1, characterized in that: The medium pressure foot mechanism comprises a lifting rod (70) slidably connected with the machine shell (90) of the machine head, the lower end of the lifting rod (70) extends out of the machine shell (90), and the lower end of the lifting rod (70) is provided with a medium pressure foot (71); one side of the upper end of the lifting rod (70) is provided with a horizontal shaft (72), the horizontal shaft (72) is connected with a third stepping motor, and the horizontal shaft (72) and the lifting rod (70) are provided with a seventh connecting rod (73) and an eighth connecting rod (74), one end of the seventh connecting rod (73) is rotatably connected with the horizontal shaft (72), the other end of the seventh connecting rod (73) is rotatably connected with the eighth connecting rod (74), and the eighth connecting rod (74) is rotatably connected with the upper end of the lifting rod (70).

3. The high speed pattern machine of claim 1, wherein: The thread cutting mechanism comprises a first movable blade (1), a second movable blade (2), a rotating shaft (3) and a motor (4), the first movable blade (1) and the second movable blade (2) are located on the two sides above the rotating shaft (3), the first movable blade (1) and the second movable blade (2) are arc-shaped, the first movable blade (1) and the second movable blade (2) are coaxial with the rotating shaft (3), and the motor (4) drives the first movable blade (1) and the second movable blade (2) to rotate towards each other.

4. The high speed pattern machine of claim 3, wherein: The rotating shaft (3) is provided with two limiting plates (5), the first rotating plate (6) and the second rotating plate (7) are arranged between the two limiting plates (5), the first rotating plate (6) and the second rotating plate (7) are coaxially penetrated by the rotating shaft (3), the first rotating plate (6) is connected with the first movable blade (1), and the second rotating plate (7) is connected with the second movable blade (2).

5. The high speed pattern machine of claim 4, wherein: The lower portion of the rotating shaft (3) is provided with a first connecting rod (8) and a second connecting rod (9), the output end of the motor (4) is provided with a driving plate (10), the middle portion of the driving plate (10) is fixed with the output end of the motor (4), one end of the first connecting rod (8) is hingedly connected with one end of the driving plate (10), the other end of the first connecting rod (8) is hingedly connected with a third connecting rod (11), the third connecting rod (11) is fixed with the lower portion of the first rotating plate (6), one end of the second connecting rod (9) is hingedly connected with the other end of the driving plate (10), the other end of the second connecting rod (9) is hingedly connected with a fourth connecting rod (12), and the fourth connecting rod (12) is fixed with the lower portion of the second rotating plate (7).

6. The high speed pattern machine of claim 3, wherein: The first movable blade (1) is provided with a V-shaped wire groove (13), the wire groove (13) faces the second movable blade (2), and the outer diameter of the first movable blade (1) matches the outer diameter of the second movable blade (2).

7. The high speed pattern machine of claim 4, wherein: The first movable blade (1) is screw-connected with the first rotating plate (6), and the second movable blade (2) is screw-connected with the second rotating plate (7).

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