Quilting presser foot mechanism of sewing machine

Abstract

The invention relates to a quilting presser foot mechanism of a sewing machine, wherein the quilting presser foot mechanism is further arranged above the workbench; the quilting presser foot mechanism comprises a connecting seat and a quilting presser foot, the quilting presser foot is connected to the connecting seat through a presser foot lifting mechanism, the connecting seat is connected to the Y-direction driving mechanism, the quilting presser foot is located directly below the machine head, the quilting presser foot is in a long strip shape along the Y-direction, and a stitch groove along the Y-direction is provided at the bottom of the quilting presser foot; the invention removes the large presser foot below the machine head, and adds a quilting presser foot mechanism linked with the Y-direction driving above the workbench, when the machine head and the bottom line mechanism are sewing on the workpiece, the quilting presser foot mechanism ensures that the thickness of the workpiece on the sewing track remains consistent, so that a conventional template machine can also complete the sewing work of bulky thick material workpieces, and has the characteristics of reasonable structure and convenient operation.

Description

Technical Field

[0001] The invention relates to sewing machine technology, in particular to a quilting presser foot mechanism of a sewing machine. Background Art

[0002] The existing template sewing machine mainly includes a machine head, a bottom line mechanism, an X-direction and a Y-direction driving mechanism, a template, a controller and a workbench. When working, the workpiece is fixed on the template, and the X-direction and the Y-direction driving mechanism drive the template to translate on the workbench according to a preset trajectory. The machine head and the bottom line mechanism cooperate to complete the preset stitches on the workpiece; in order to make the sewing stitches beautiful, a large annular presser foot is usually provided at the lower end of the machine head. When the workpiece on the template moves relative to the machine head, the large presser foot flattens the sewing area in advance, thus ensuring that the stitches are flat and beautiful; at present, when the template machine with this conventional structure is used to sew ultra-thick and soft workpieces such as sofa cushions, the existing conventional template sewing machine cannot sew normally because the thickness of the workpiece after being pressed by the presser foot and the thickness in the natural state vary too much. Summary of the invention

[0003] The purpose of the present invention is to provide a quilting presser foot mechanism for a sewing machine, in which the large presser foot under the machine head is removed, and a quilting presser foot mechanism linked with the Y-axis drive is added above the workbench. When the machine head and the bottom line mechanism are sewing on the workpiece, the thickness of the workpiece on the sewing track is ensured to remain consistent. A conventional template machine can also complete the sewing of bulky thick workpieces, and the machine has the characteristics of reasonable structure and convenient operation.

[0004] To achieve the above purpose, the following technical solutions are adopted:

[0005] A quilting presser foot mechanism of a sewing machine comprises a workbench and a machine head above the workbench, a bottom line mechanism is provided on the workbench directly below the machine head, a Y-direction driving mechanism is also provided on the workbench, and an X-direction driving mechanism is installed on the Y-direction driving mechanism, and the characteristics are: the machine head is connected to a machine body on the workbench through a machine head lifting mechanism; a quilting presser foot mechanism is also provided above the workbench, and the quilting presser foot mechanism is connected to the Y-direction driving mechanism; the quilting presser foot mechanism comprises a connecting seat and a quilting presser foot, the quilting presser foot is connected to the connecting seat through the presser foot lifting mechanism, and the connecting seat is connected to the Y-direction driving mechanism, the quilting presser foot is located directly below the machine head, the quilting presser foot is in a long strip shape along the Y direction, and a stitch groove along the Y direction is provided at the bottom of the quilting presser foot.

[0006] The connecting seat includes an overhanging part and a longitudinal part. The lower end of the longitudinal part is connected to the Y-axis driving mechanism through a fixed seat; one end of the overhanging part is connected to the upper part of the longitudinal part, and the quilting presser foot is connected to the overhanging part through a presser foot lifting mechanism.

[0007] A Y-direction guiding mechanism is arranged between the overhanging part and the fuselage.

[0008] The overhanging part is located at one side of the machine head, an offset connecting part is arranged at one side of the quilting presser foot, and the lower end of the presser foot lifting mechanism is connected to the offset connecting part.

[0009] The top of the quilting presser foot is provided with a stitch avoidance groove along the Y direction, the stitch groove is provided at the bottom of the stitch avoidance groove, a downwardly protruding stitch reinforcement portion is provided at the bottom of the machine head, the width of the quilting presser foot and the stitch avoidance groove in the X direction gradually decreases from top to bottom, and the width of the stitch reinforcement portion in the X direction also gradually decreases from top to bottom.

[0010] The bottom of the quilting presser foot is provided with a flat pressing portion protruding downward, and a stitch groove penetrates the flat pressing portion from top to bottom.

[0011] The machine head is provided with a thread taking-up mechanism, which includes a thread taking-up rod and a driving cam. A wire hole is provided at one end of the thread taking-up rod, and the other end is pivotally connected to the machine head housing through a pivot part. A strip-shaped driving guide groove is provided between the two ends of the thread taking-up rod; the driving cam is connected to the driving device of the needle through a transmission mechanism, and the output roller of the driving cam is accommodated in the driving guide groove, and the output roller can move in the driving guide groove.

[0012] One end of the driving guide groove is close to the pivotal part of the thread take-up lever, and the other end of the driving guide groove is close to the middle part of the thread take-up lever.

[0013] The thread take-up lever is an arc-shaped structure or an L-shaped structure, and the driving guide groove is close to one side of the pivoting part.

[0014] The invention aims at the excessive compression deformation of ultra-thick and soft workpieces such as sofa cushions, and specially designs a quilting foot presser mechanism for this purpose. The quilting foot of the quilting foot presser mechanism is a long strip structure, and the quilting foot presser mechanism is connected to the Y-direction driving mechanism of the template machine. When working, the quilting foot presses down to press the sewing track of the workpiece to keep the sewing smooth. When sewing, the workpiece and the quilting foot are driven by the Y-direction driving mechanism to move along the Y-direction, ensuring that the machine head can smoothly complete the straight line sewing in the Y-direction. The invention realizes that a conventional template machine can also sew bulky and thick workpieces, and has the characteristics of reasonable structure and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention (I);

[0016] Figure 2 It is a structural schematic diagram of the present invention (II);

[0017] Figure 3 It is a structural schematic diagram of a part of the structure of the present invention;

[0018] Figure 4 It is a structural schematic diagram of the machine head and quilting presser foot mechanism of the present invention;

[0019] Figure 5 It is a schematic diagram of the structure of the machine head and the quilting presser foot mechanism of the present invention after being pressed down;

[0020] Figure 6 It is a structural schematic diagram of the quilting presser foot mechanism of the present invention;

[0021] Figure 7 It is a structural schematic diagram of the thread taking-up mechanism inside the machine head of the present invention. DETAILED DESCRIPTION

[0022] like Figure 1-7 As shown, a quilting presser foot mechanism of a sewing machine comprises a workbench 1 and a machine head 2 above the workbench, a bottom line mechanism 3 is provided at a position of the workbench 1 directly below the machine head 2, a Y-direction driving mechanism 4 is also provided on the workbench 1, and an X-direction driving mechanism 5 is installed on the Y-direction driving mechanism 4, the machine head 2 is connected to a machine body 6 on the workbench through a machine head lifting mechanism 21; a quilting presser foot mechanism 7 is also provided above the workbench 1, and the quilting presser foot mechanism 7 is connected to the Y-direction driving mechanism 4; the quilting presser foot mechanism 7 comprises a connecting seat 71 and a quilting presser foot mechanism 7. The quilting presser foot 72 is connected to the connecting seat 71 through a presser foot lifting mechanism 73. The connecting seat 71 includes an overhanging portion 711 and a longitudinal portion 712. The lower end of the longitudinal portion 712 is connected to the Y-direction driving mechanism 4 through a fixed seat 713; one end of the overhanging portion 711 is connected to the upper part of the longitudinal portion 712, and the quilting presser foot 72 is connected to the overhanging portion 711 through a presser foot lifting mechanism 73. The overhanging portion 711 is located on one side of the machine head 2. An offset connecting portion 75 is provided on one side of the quilting presser foot 72, and the lower end of the presser foot lifting mechanism 73 is connected to the offset connecting portion 75; a Y-direction guiding mechanism 61 is provided between the overhanging portion 711 and the machine body.

[0023] The quilting presser foot 72 is located directly below the machine head 2, and is strip-shaped along the Y direction. A stitch groove 74 along the Y direction is provided at the bottom of the quilting presser foot 72; a stitch avoidance groove 76 is provided at the top of the quilting presser foot 72 along the Y direction, and the stitch groove 74 is provided at the bottom of the stitch avoidance groove 76. A downwardly protruding stitch reinforcement portion 20 is provided at the bottom of the machine head 2. The widths of the quilting presser foot 72 and the stitch avoidance groove 76 in the X direction gradually decrease from top to bottom, and the width of the stitch reinforcement portion 20 in the X direction also gradually decreases from top to bottom; a downwardly protruding plane holding portion 77 is provided at the bottom of the quilting presser foot 72, and the stitch groove 74 penetrates the plane holding portion 77 from top to bottom.

[0024] Aiming at the characteristic that the compression deformation of ultra-thick and soft workpieces such as sofa cushions is too large, the present invention specially designs a quilting presser foot mechanism. The quilting presser foot of the quilting presser foot mechanism is a long strip structure. The quilting presser foot mechanism is connected to the Y-direction driving mechanism of the template machine. When working, the quilting presser foot presses down to press the subsequent sewing trajectory of the workpiece once to keep the sewing smooth. When sewing, the workpiece and the quilting presser foot are driven by the Y-direction driving mechanism to move along the Y-direction, ensuring that the machine head can smoothly complete the straight line sewing in the Y-direction.

[0025] In order to save more effort when pressing down, the width of the quilting presser foot 72 in the X direction of the present invention gradually decreases from top to bottom, and a flat pressing portion 77 is provided at the bottom, so that when the quilting presser foot 72 compresses the workpiece, it only needs to compress the deformation amount of the workpiece on both sides at the position of half of the sewing trajectory, and no large-area compression is required, which can ensure the compression effect and reduce the resistance of the quilting presser foot 72 to press down; at the same time, since the deformation amount of the workpiece is very large, the shape of the lower part of the ordinary machine head cannot cooperate with the stitch avoidance groove 76, and the present invention also provides a downwardly protruding stitch reinforcement portion 20 at the bottom of the machine head 2. The purpose of this design is to increase the stability of the needle bar and the small presser foot when they are working.

[0026] Although the quilting presser foot presses the sewing track part of the workpiece to the lowest level during sewing, the thickness of the sewing part of the workpiece after compression is still much greater than that of a conventional workpiece. In this way, higher requirements are placed on the amplitude and speed of thread release and thread retraction when the needle is working. For this reason, the present invention improves the structure of the thread taking-up mechanism of the machine head. The thread taking-up mechanism includes a thread taking-up rod 81 and a driving cam 82. One end of the thread taking-up rod 81 is pivotally connected to the housing of the machine head 2 through a pivoting portion 84, and the other end is a free end. A wire hole 83 is provided on the free end. A strip-shaped driving guide groove 85 is provided between the two ends of the thread taking-up rod 81. The driving cam 82 is connected to the driving device 22 of the needle through a transmission mechanism, and the output roller 86 of the driving cam 82 is accommodated in the driving guide groove 85, and the output roller 86 can move in the driving guide groove 85. One end of the driving guide groove 85 is close to the pivoting portion 84 of the thread taking-up rod, and the other end of the driving guide groove 85 is close to the middle of the thread taking-up rod 81. The thread taking-up rod 81 is an arc-shaped structure or an L-shaped structure.

[0027] The present invention arranges the driving end of the thread take-up lever connected to the driving cam on the driving guide groove in the middle of the thread take-up lever, and the two ends of the thread take-up lever are respectively a pivoting portion and a guide hole. The position of the driving end on the thread take-up lever changes with the change of the height of the wire hole. In this way, on the one hand, the up and down swing amplitude of the thread take-up lever can be increased to increase the length of the thread release and take-up. On the other hand, the speed of the thread release and take-up is also variable. For example, when the free end of the thread take-up lever just starts to move downward, the output roller 86 is at the position closest to the pivoting portion in the driving guide groove 85. At this time, the free end moves at the fastest speed, and the thread release speed of the thread take-up lever is also the fastest. During the downward movement of the free end of the thread take-up lever, the output roller 86 is 6 gradually moves toward the middle of the thread take-up rod in the driving guide groove 85, the movement speed of the thread take-up rod also gradually slows down, and the thread releasing speed of the thread take-up rod also slows down synchronously; when the free end of the thread take-up rod moves to the lowermost end, it starts to reset upward, and the speed of the thread take-up rod resetting upward is exactly the opposite of the downward speed, that is, first slow and then fast, so the thread taking-up speed is a process of first slow and then fast. This setting is because it is necessary to release the thread quickly when sewing thick workpieces, which can prevent the surface thread from not keeping up with the speed of the needle, and the thread taking-up is first slow and then fast, and the final fast thread taking-up mainly tightens the surface thread. The stitches of this kind of sewing will not be loose but will be relatively tight, and the stitches will be more beautiful.

[0028] The invention realizes the stitching work of the conventional template machine on the bulky thick material workpiece, and has the characteristics of reasonable structure and convenient operation.

Claims

1. A quilting presser foot mechanism of a sewing machine, comprising a workbench (1) and a machine head (2) above the workbench, wherein the workbench (1) is provided with a bottom thread mechanism (3) located directly below the machine head (2), and the workbench (1) is also provided with a Y-direction drive mechanism (4), and an X-direction drive mechanism (5) is installed on the Y-direction drive mechanism (4), characterized in that: The machine head (2) is connected to the machine body (6) on the workbench through a machine head lifting mechanism (21); a quilting foot presser mechanism (7) is also arranged above the workbench (1); the quilting foot presser mechanism (7) comprises a connecting seat (71) and a quilting foot presser (72); the quilting foot presser (72) is connected to the connecting seat (71) through a foot presser lifting mechanism (73); the connecting seat (71) is connected to the Y-direction driving mechanism (4); the quilting foot presser (72) is located directly below the machine head (2); the quilting foot presser (72) is in the shape of a long strip along the Y-direction; the quilting foot presser presses down to press the next sewing track of the workpiece once and keeps the sewing smooth; the quilting foot presser (72) is located directly below the machine head (2); the quilting foot presser (72) is in the shape of a long strip along the Y-direction; the quilting foot ... 2) A stitch groove (74) is provided at the bottom along the Y direction; a stitch avoidance groove (76) is provided at the top of the quilting presser foot (72) along the Y direction, the stitch groove (74) is provided at the bottom of the stitch avoidance groove (76), a stitch reinforcement portion (20) protruding downward is provided at the bottom of the machine head (2), the width of the quilting presser foot (72) and the stitch avoidance groove (76) in the X direction gradually decreases from top to bottom, and the width of the stitch reinforcement portion (20) in the X direction also gradually decreases from top to bottom; the bottom of the quilting presser foot (72) has a plane holding portion (77) protruding downward, and the stitch groove (74) penetrates the plane holding portion (77) from top to bottom.

2. A quilting presser foot mechanism for a sewing machine as claimed in claim 1, characterized in that: The connecting seat (71) comprises an overhanging portion (711) and a longitudinal portion (712); the lower end of the longitudinal portion (712) is connected to the Y-axis driving mechanism (4) via a fixed seat (713); one end of the overhanging portion (711) is connected to the upper portion of the longitudinal portion (712); and the quilting presser foot (72) is connected to the overhanging portion (711) via a presser foot lifting mechanism (73).

3. A quilting presser foot mechanism for a sewing machine as claimed in claim 2, characterized in that: A Y-direction guide mechanism (61) is provided between the overhanging portion (711) and the fuselage.

4. A quilting presser foot mechanism for a sewing machine as claimed in claim 2 or 3, characterized in that: The overhanging portion (711) is located on one side of the machine head (2), an offset connecting portion (75) is provided on one side of the quilting presser foot (72), and the lower end of the presser foot lifting mechanism (73) is connected to the offset connecting portion (75).

5. A quilting presser foot mechanism for a sewing machine as claimed in claim 1, characterized in that: The machine head (2) is provided with a thread taking-up mechanism, which comprises a thread taking-up lever (81) and a driving cam (82). The thread taking-up lever (81) has a thread hole (83) at one end, and the other end is pivotally connected to the machine head (2) housing via a pivoting portion (84). The thread taking-up lever (81) has a strip-shaped driving guide groove (85) between the two ends. The driving cam (82) is connected to the driving device (22) of the machine needle via a transmission mechanism. The output roller (86) of the driving cam (82) is accommodated in the driving guide groove (85), and the output roller (86) can move in the driving guide groove (85).

6. A quilting presser foot mechanism for a sewing machine as claimed in claim 5, characterized in that: One end of the driving guide groove (85) is close to the pivoting portion (84) of the thread take-up lever, and the other end of the driving guide groove (85) is close to the middle portion of the thread take-up lever (81).

7. A quilting presser foot mechanism for a sewing machine as claimed in claim 5 or 6, characterized in that: The thread take-up lever (81) is an arc-shaped structure or an L-shaped structure, and the driving guide groove (85) is close to one side of the pivoting portion (84).

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