WO2020125034A1

WO2020125034A1 - Thread conveying device for sewing

Info

Publication number: WO2020125034A1
Application number: PCT/CN2019/100758
Authority: WO
Inventors: 马瑞
Original assignee: 马瑞
Priority date: 2018-12-20
Filing date: 2019-08-15
Publication date: 2020-06-25
Also published as: CN109371584A; CN109371584B

Abstract

Disclosed is a thread conveying device for sewing, comprising an upper thread needle (4), an upper thread positioning mechanism and a bottom thread stirring needle (6), wherein a bottom thread hole for a bottom thread to pass through is formed in the bottom thread stirring needle (6), and the upper thread needle (4) is arranged in an ascending and descending manner; after descending, a lower end of the upper thread needle (4) penetrates through the upper thread positioning mechanism; the bottom thread stirring needle (6) is arranged on an upper side of the upper thread positioning mechanism; and a stirring needle driving mechanism for driving the bottom thread stirring needle (6) to swing around an axis of the upper thread needle (4) is connected to the bottom thread stirring needle. The bottom thread stirring needle (6) is used to drive the bottom thread to swing around the axis of the upper thread needle (4), the upper thread positioning mechanism is used to position the upper thread after the upper thread needle (4) descends, and the bottom thread stirring needle (6) is used to stir the upper thread, such that the bottom thread and the upper thread are wound and looped. A bottom thread bobbin is replaced, and the bottom thread only needs to pass through the bottom thread hole of the bottom thread stirring needle (6), such that the thread feeding time of the bottom thread can be greatly reduced, endless thread feeding of the bottom thread can be theoretically realized, the device is not limited by the size of the bobbin, and the working efficiency is improved.

Description

Sewing thread feeding device

This application requires the priority of the Chinese patent application filed on December 20, 2018 in the Chinese Patent Office with the application number 201811565314.0 and the application name as "a sewing thread feed device", the entire content of which is incorporated by reference in this application .

Technical field

The present application relates to the technical field of fabric processing technology, and in particular to a sewing thread feeding device.

Background technique

Sewing machine and embroidery machine are necessary equipment for processing clothes fabrics, bedding and various curtain fabrics. These equipments require the upper thread and the lower thread to sew together. The upper thread refers to the thread above the fabric. The upper thread is worn at On the hole at the lower end of the needle, the bottom thread refers to the thread placed under the fabric. In the past, the bobbin thread was conveyed through the bobbin bobbin. At the same time, the bobbin is also provided with a hook for hooking the upper thread. The middle shuttle hook hooks the upper thread and winds the upper thread and the lower thread around the fabric to form a chain.

The bobbin is not only responsible for conveying the lower thread, but also for catching the upper thread, so the volume of the bobbin is very limited. A separate bobbin needs to be prepared inside the bobbin, and the bobbin cannot be wound with too much bobbin thread. 100-200 bobbins need to be configured. When the lower thread is used up, a new bobbin needs to be replaced. On average, the bobbin needs to be replaced every 45 minutes, which is time-consuming and labor-intensive, has low working efficiency, and is prone to the phenomenon that the lower thread is stuck. , Causing a lot of waste in the bottom line.

Application content

The purpose of the embodiments of the present application is to provide a sewing thread feeding device to solve the problems of time-consuming and labor-intensive replacement of the existing bobbin, low working efficiency, and wasted bobbin thread, completely replacing the bobbin and improving the production efficiency.

To achieve the above purpose, specifically, the sewing thread feeding device includes an upper thread needle, an upper thread positioning mechanism, and a lower thread dial, the upper portion of the lower thread needle is provided with an upper thread hole for threading the upper thread, and the lower thread dial The needle is provided with a lower thread hole for threading the lower thread. The upper thread needle is set up and down. After the upper thread needle is lowered, the lower end passes through the upper thread positioning mechanism. The lower thread dial is provided on the upper side of the upper thread positioning mechanism. The lower thread setting needle is connected with a setting needle driving mechanism which drives the bottom thread setting needle to swing around the axis where the upper thread needle is located.

The sewing thread feeding device further includes a bobbin thread tensioning mechanism. The bobbin thread passes through the bobbin thread tensioning mechanism and then passes through the bobbin thread hole. The bobbin thread tensioning mechanism keeps the bobbin thread between the bobbin thread tensioning mechanism and the upper thread in Tension.

The bottom thread tensioning mechanism includes a bottom thread traction guide mechanism and a tension cam. The tension cam is rotatably disposed on the side of the bottom thread traction guide mechanism, and the bottom thread passes through the bottom thread hole after passing through the bottom thread traction guide mechanism.

The bottom thread traction guide mechanism includes two guide pieces and a pressing piece. The pressing piece is disposed between the two guide pieces. The guide piece is provided with a threading hole, and the tensioning cam is a grooved wheel. The pressing piece presses the bottom line between the two guide pieces into the wheel groove of the tightening cam.

The side wall of the wheel groove of the tensioning cam is provided with an air flow hole.

One end of the pressing piece is connected with a torsion spring that drives it to rotate, and the other end is fixed by a spring piece.

The dial drive mechanism includes a drive spindle, an intermediate drive sleeve, and an eccentric swing shaft. The eccentric swing shaft is connected to a power mechanism through a rotary shaft. The axis of the eccentric swing shaft crosses the axis of the rotary shaft. The eccentric swing The shaft is rotatably connected to the inner side of the intermediate drive sleeve, the outer side of the intermediate drive sleeve is fixed to a radial shaft along its radial direction, the radial shaft is slidingly connected to one end of the drive spindle, and the axis of the radial shaft is perpendicular to The axis of the drive spindle, the bottom thread dial is fixed at the other end of the drive spindle.

The upper thread positioning mechanism includes a fixed fixing rod and a movable positioning rod. The positioning rod is connected to the driving spindle through a lateral reciprocating mechanism.

The lateral reciprocating mechanism includes a toggle block and a toggle upright, the toggle block is fixed on the drive spindle, the lower end of the toggle upright is set on one side of the toggle block, and the upper end is connected to a laterally positioned positioning Rod, the positioning rod is connected with a return spring.

The sewing thread feeding device further includes a cutting mechanism. The cutting mechanism includes a fixed knife and a movable knife. The fixed knife is fixedly installed, and the movable knife is connected with a swing lever that drives the horizontal swing.

The embodiments of the present application have the following advantages:

The embodiment of the present application uses the lower thread dial to drive the lower thread to swing around the axis where the upper thread needle is located, uses the upper thread positioning mechanism to position the upper thread after the upper thread needle falls, and uses the lower thread dial to move the upper thread, so that the lower thread is wound with the upper thread The loop replaces the bobbin thread of the bobbin thread. The bobbin thread only needs to be threaded on the bobbin thread hole of the bobbin thread setting needle, which can greatly increase the bobbin thread supply time. In theory, the bobbin thread can be supplied indefinitely and is no longer limited to the bobbin thread. Size, improve work efficiency.

BRIEF DESCRIPTION

FIG. 1 is a schematic structural diagram of Example 1 of the present application.

FIG. 2 is a schematic view of Embodiment 1 of the present application after hiding the sewing panel.

FIG. 3 is a schematic diagram of concealing the sewing panel and the box cover of Example 1 of the present application.

FIG. 4 is a schematic diagram of a dial drive mechanism according to Embodiment 1 of the present application.

FIG. 5 is an exploded view of the dial drive mechanism of Embodiment 1 of the present application.

6 is a schematic diagram of the bottom line tightening mechanism of Example 1 of the present application.

7 is a schematic diagram of step 1 of the wire feeding method according to Embodiment 1 of the present application.

FIG. 8 is a schematic diagram of step two of the wire feeding method in Embodiment 1 of the present application.

Fig. 9 is a left side view of the upper thread needle and the lower thread dial in Fig. 8.

FIG. 10 is a schematic diagram of step three of the wire feeding method according to Embodiment 1 of the present application.

FIG. 11 is a schematic diagram of step 4 of the wire feeding method according to Embodiment 1 of the present application.

FIG. 12 is a schematic diagram of step 5 of the wire feeding method according to Embodiment 1 of the present application.

In the picture: 1-transmission box 2-gear 3-upper thread board 4-upper thread needle 5-bottom thread tension mechanism 6-bottom thread dial 7-fixed knife 8-movable knife 9-fixed rod 10-positioning rod 11-lead 12-drive spindle 13-drive block 14-intermediate drive sleeve 15-swing sleeve 16-swing block 17-swing lever 18-return spring 19-rotation shaft 20-eccentric swing shaft 21-radial shaft 22 -Guide piece 23-Compression piece 24-Threading hole 25-Tightening cam 26-Air flow hole 27-Spring piece 28-Pull ring 29-Spring piece 30-Card slot 31-Angle of the first bottom line V-shaped space 32-surface Line V-shaped space angle 33- The second bottom line V-shaped space angle.

detailed description

The following describes the implementation of the present application by specific specific examples. Those familiar with this technology can easily understand other advantages and effects of the present application by the contents disclosed in this specification.

It should be noted that the structure, ratio, size, etc. shown in the drawings of this specification are only used to match the content disclosed in the specification for those familiar with this technology to understand and read, not to limit the application of this application. Limited conditions, so it has no technical significance. Any structural modifications, changes in proportional relationship, or size adjustments should still fall within this application without affecting the efficacy and purposes that can be achieved by this application. The disclosed technical content can be covered. At the same time, the terms such as "upper", "lower", "left", "right", "inner", "outer", "middle", etc. cited in this manual are only for the convenience of description, not It is used to limit the scope of this application that can be implemented, and changes or adjustments in its relative relationship, without substantial changes in the technical content, should also be regarded as the scope of this application.

Example 1

1 to 3, the sewing thread feeding device includes a transmission box 1, an upper thread plate 3, an upper thread needle 4, an upper thread positioning mechanism, a lower thread setting needle 6 and a lower thread tensioning mechanism 5, the upper thread plate 3 is provided in the transmission On the upper side of the box 1, the upper thread needle 4 is provided with a lower thread hole for threading the upper thread, the lower thread dial 6 is provided with a lower thread hole for threading the lower thread, the upper thread needle 4 is set up and down and passes through the upper thread plate 3, the upper thread needle 4 is lowered and the lower end passes through the upper thread positioning mechanism. The lower thread setting needle 6 is provided on the upper side of the upper thread positioning mechanism. The lower thread setting needle 6 is connected to drive it to swing around the axis of the upper thread needle 4 A dial-setting driving mechanism is provided in the transmission box 1. A gear 2 connected to the dial-setting driving mechanism is provided on one side of the transmission box 1, and the gear 2 is connected to the motor. The lower thread passes through the lower thread tensioning mechanism 5 and then passes through the lower thread hole. The lower thread tensioning mechanism 5 keeps the lower thread between the lower thread tensioning mechanism 5 and the upper thread in a tightened state.

The sewing thread feeding device also includes a cutting mechanism, which is used to cut the thread after sewing or embroidering a flower to further improve the degree of automation. The cutting mechanism of this embodiment includes a fixed knife 7 and a movable knife 8, the fixed knife 7 is fixedly arranged on the lower side of the upper thread plate 3, the movable knife 8 is swingably arranged on the lower side or the upper side of the fixed knife 7, and the movable knife 8 is connected with a drive Its swing lever swings horizontally.

4-5, the dial drive mechanism includes a drive spindle 12, an intermediate drive sleeve 14, and an eccentric swing shaft 20. The eccentric swing shaft 20 is connected to the gear 2 through a rotating shaft 19. The axis of the eccentric swing shaft 20 and the axis of the rotating shaft 19 Cross-arranged, the eccentric swing shaft 20 is rotatably connected to the inner side of the intermediate drive sleeve 14, the outer side of the intermediate drive sleeve 14 is fixed to the radial shaft 21 along its radial direction, and the radial shaft 21 is slidably connected to one end of the drive spindle 12, and The axis of the radial shaft 21 is perpendicular to the axis of the drive spindle 12, and the lower thread dial 6 is fixed to the other end of the drive spindle 12. A swing shaft sleeve 15 is fixedly connected to the rotating shaft 19 of this embodiment, one end surface of the swing shaft sleeve 15 is a wedge-shaped surface, and the eccentric swing shaft 20 is vertically fixed on the wedge-shaped surface. During the rotation of the rotating shaft 19, the swing bush 15 is rotated, and the eccentric swing shaft 20 generates an eccentric rotation. During the rotation of the eccentric swing shaft 20, the intermediate drive bush 14 is synchronized with the eccentric swing, and the radial direction of the intermediate drive bush 14 is radial. The shaft 21 is slidably connected to the drive block 13 at the end of the drive spindle 12, the intermediate drive sleeve 14 drives the drive spindle 12 to produce axial movement and rotates at the same time, and finally drives the lower thread dial 6 to make irregular movement around the axis of the upper thread needle 4 It circulates and oscillates, so as to realize the dialing of the upper thread, and the components are closely coordinated, without the need for multiple power mechanisms, and the structure is simple.

The upper thread positioning mechanism includes a fixed fixing rod 9 and a movable positioning rod 10, and the positioning rod 10 is connected to the driving spindle 12 through a lateral reciprocating mechanism. The lateral reciprocating mechanism includes a toggle block 16 and a toggle upright 17, the toggle block 16 is fixed on the drive spindle 12, the lower end of the toggle upright 17 is set on one side of the toggle block 16, and the upper end is connected to the laterally positioned positioning The lever 10 and the positioning lever 10 are connected with a return spring 18.

Referring to FIG. 6, the lower thread tensioning mechanism 5 includes a lower thread traction guide mechanism and a tightening cam 25. The tightening cam 25 is rotatably disposed on the side of the lower thread traction guide mechanism. The lower thread passes through the lower thread traction guide mechanism and then passes through the lower thread hole. The bottom thread traction guide mechanism includes two guide pieces 22 and a pressing piece 23. The pressing piece 23 is arranged between the two guide pieces 22, and the guide piece 22 is provided with a threading hole 24, and the tensioning cam 25 is a grooved wheel. The pressing piece 23 presses the bottom thread between the two guide pieces 22 into the wheel groove of the tensioning cam 25, and the reciprocating movement of the bottom thread is realized by the rotation of the tensioning cam 25, so as to cooperate with the action of the bottom thread dial 6 , When the lower thread dial 6 swings away from the tension cam 25, the tension cam 25 rotates away from the pressure piece 23, and the lower thread is appropriately loosened. When the lower thread dial 6 swings toward the tension cam 25 , The tightening cam 25 tightens upwards, so that the bottom line is tightened, keeping the bottom line always with a constant tension.

One end of the pressing piece 23 is connected with a torsion spring that drives it to rotate, and the other end is fixed by a spring piece 27. The spring piece 27 is vertically fixed on the support plate. The support plate is fixedly connected to the transmission box 1, and one side of the support plate is fixedly expanded. The motor is tightened, the pressing piece 23, the guide piece 22 and the tensioning cam 25 are fixed on the other side of the support plate, the output shaft of the tensioning motor is connected to the tensioning cam 25, and the upper end of the spring piece 27 has a downwardly bent The elastic piece 29 is provided with a clamping slot 30 for fixing the pressing piece 23 on the lower side of the elastic piece 29, and a pull ring 28 is provided on the support plate. The pull ring 28 is disposed outside the spring piece 27 and the pull ring 28 Press the spring piece 27 inward, so that the spring piece 27 reliably fixes the pressing piece 23. When the thread needs to be changed, pull the spring piece 27 outward, and the pressing piece 23 swings upward under the drive of the torsion spring to pull the new lower thread It is convenient to change the thread through the threading hole 24 of the guide piece 22.

Further, in this embodiment, an airflow hole 26 is provided on the side wall of the wheel groove of the tensioning cam 25. During the rotation of the tensioning cam 25, the airflow hole 26 forms a certain airflow, which can blow down the hair attached to the bottom line , The processing quality is higher.

The wire delivery method of this application includes the following steps:

Step 1, refer to FIG. 7, the broken line in the figure is the bottom line, the solid line passing through the upper thread needle 4 is the upper thread, the upper thread needle 4 is at the highest point, the lower thread dial 6 is located at the leftmost end and is in front of the lower thread needle 4 The upper thread passes through the upper thread hole of the upper thread needle 4. The upper thread behind the upper thread needle 4 is subjected to the tension of the fabric on the upper thread plate 3. The lower thread passes through the lower thread hole on the lower thread dial 6 from right to left. The lower thread on the left of the lower thread dial 6 is subjected to the tension of the fabric on the upper thread plate 3. At this time, the left lower thread and the lower thread dial 6 form a first lower thread V-shaped space angle 31 located at the lower left of the upper thread needle 4.

Step two, refer to Figures 8-9. When the upper thread needle 4 moves down with the upper thread, the lower thread dial 6 swings to the right with the lower thread, and the upper thread needle 4 pulls the upper thread needle 4 down through the lower thread and The upper thread V-shaped space angle 32 formed by the lower thread dial 6. When the upper thread needle 4 reaches the lower limit position, the lower thread dial 6 simultaneously reaches the right end limit position. At this time, referring to FIG. 9, the upper thread needle 4 forms a V-shaped angle with the upper thread on the left, the needle tip of the lower thread dial 6 is on the right of the upper thread needle 4, and the left lower thread is on the upper thread needle 4 and its front side In front of the line.

Step 3, referring to FIG. 10, when the lower thread dial 6 pulls the lower thread to move behind the upper thread needle 4, the drive shaft simultaneously drives the positioning rod 10 to move, the positioning rod 10 cooperates with the fixed rod 9 to clamp the upper thread or block the upper thread Side. At this time, the tip of the lower thread dial 6 pulls the lower thread from front to back and winds the upper thread needle 4 and the front thread, the lower thread dial 6 passes through the upper thread and the upper thread needle 4 in the figure c behind the upper thread needle 4 The formed upper surface V-shaped space includes an angle 32.

Step 4, referring to FIG. 11, when the tip of the lower thread setting needle 6 enters the angle 32 of the upper thread V-shaped space formed by the upper thread needle and the upper thread needle 4 behind the upper thread needle 4, the upper thread needle 4 moves upward and the upper thread Wrapped under the lower thread dial 6 does not move upward with the upper thread needle 4. When the lower thread dial 6 moves to the left limit position, the left bottom thread and the lower thread dial 6 form a second lower thread V-shaped space angle 33 located at the lower left of the upper thread needle 4, and the upper thread needle 4 reaches the highest point.

Step 5, referring to Fig. 12, the fabric moves a certain distance, the lower thread dial 6 moves to the right, and the upper thread needle 4 moves a certain distance relative to the fabric on the upper side of the fabric and then passes downward through the fabric again, on the lower thread dial 6 The upper thread is detached from the lower thread dial 6 and the front thread needle 4 is inserted into the second lower thread V-shaped space 33. When the lower thread dial 6 swings to the right limit position, the upper thread on the lower thread dial 6 is detached from the lower thread dial 6 However, since the upper thread needle 4 that has landed again at this time drives the upper thread into the second lower thread V-shaped space angle 33, the upper thread dropped on the lower thread dial 6 and the lower thread at the angle 33 of the second lower thread V-shaped space Wrap into a loop, so that the upper thread and the lower thread are wound back and forth to form a chain.

Although the present application has been described in detail with general description and specific embodiments above, on the basis of this application, some modifications or improvements can be made to it, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the present application belong to the scope of protection claimed in the present application.

Claims

A sewing thread feeding device, characterized in that the sewing thread feeding device includes an upper thread needle (4), an upper thread positioning mechanism and a lower thread setting needle (6), and the lower portion of the upper thread needle (4) is provided with a In the upper thread hole for threading the upper thread, the lower thread dial (6) is provided with a lower thread hole for threading the lower thread, the upper thread needle (4) is set up and down, and the upper thread needle (4) is lowered The lower end passes through the upper thread positioning mechanism, and the lower thread dial (6) is provided on the upper side of the upper thread positioning mechanism, and the lower thread dial (6) is connected with a dial that drives it to swing around the axis where the upper thread needle (4) is located Needle drive mechanism.
The sewing thread feeding device according to claim 1, wherein the sewing thread feeding device further comprises a bobbin thread tensioning mechanism (5), and the bobbin thread passes through the bobbin thread tensioning mechanism (5) and then passes through The bottom thread hole, the bottom thread tensioning mechanism (5) keeps the bottom thread between the bottom thread tensioning mechanism (5) and the upper thread in a tensioned state.
The sewing thread feeding device according to claim 2, wherein the lower thread tensioning mechanism (5) includes a lower thread traction guide mechanism and a tensioning cam (25), and the tensioning cam (25) is rotatably disposed at On the side of the lower thread traction guide mechanism, the lower thread passes through the lower thread hole after passing through the lower thread traction guide mechanism.
The sewing thread feeding device according to claim 3, wherein the bobbin thread traction guide mechanism includes two guide pieces (22) and a pressing piece (23), the pressing piece (23) is provided at Between the two guide pieces (22), the guide piece (22) is provided with a threading hole (24), the tensioning cam (25) is a grooved wheel, and the compression piece (23) The bottom line between the guide pieces (22) is pressed into the wheel groove of the tensioning cam (25).
The sewing thread feeding device according to claim 4, characterized in that an airflow hole (26) is provided on the side wall of the wheel groove of the tensioning cam (25).
The sewing thread feeding device according to claim 4, characterized in that one end of the pressing piece (23) is connected with a torsion spring that drives the rotation, and the other end is fixed by a spring piece (27).
The sewing thread feeding device according to claim 1, characterized in that: the needle driving mechanism includes a driving spindle (12), an intermediate driving sleeve (14), and an eccentric swing axis (20), the eccentric swing axis (20) The power mechanism is connected through a rotating shaft (19), the axis of the eccentric swinging shaft (20) and the axis of the rotating shaft (19) are arranged crosswise, and the eccentric swinging shaft (20) is rotatably connected to the intermediate drive bush ( 14) Inside, the middle drive sleeve (14) is fixed on the outside of the radial shaft (21) along its radial direction, the radial shaft (21) is slidingly connected to one end of the drive spindle (12), and the diameter The axis of the steering shaft (21) is perpendicular to the axis of the driving spindle (12), and the lower thread dial (6) is fixed at the other end of the driving spindle (12).
The sewing thread feeding device according to claim 7, characterized in that the upper thread positioning mechanism includes a fixedly arranged fixed rod (9) and a movably arranged positioning rod (10), the positioning rod (10) passes The lateral reciprocating mechanism is connected to the driving spindle (12).
The sewing thread feeding device according to claim 8, characterized in that the lateral reciprocating movement mechanism includes a toggle block (16) and a toggle upright (17), the toggle block (16) is fixed on the drive On the main shaft (12), the lower end of the toggle upright (17) is set on one side of the toggle block (16), and the upper end is connected to a positioning rod (10) provided laterally, and the positioning rod (10) is connected with a reset Spring (18).
The sewing thread feeding device according to claim 1, wherein the sewing thread feeding device further includes a cutting mechanism, the cutting mechanism includes a fixed knife (7) and a movable knife (8), the fixed knife (7) Fixed installation, the movable knife (8) is connected with a swing lever that drives the horizontal swing.