Sewing thread tensioning mechanism of quilting machine

Abstract

A sewing thread tensioning mechanism of a quilting machine is arranged on a sewing machine head and comprises a fixing frame, a mounting plate and a pulley block, one end of the fixing frame is fixedly connected with the outer side surface of the sewing machine head, the other end of the fixing frame is fixedly connected with the mounting plate, and the pulley block comprises a first fixed pulley, a movable pulley and a second fixed pulley. The first fixed pulley and the second fixed pulley are rotationally connected to the mounting plate, rotating shafts of the first fixed pulley and the second fixed pulley are arranged in parallel up and down, and the movable pulley is slidably connected between the first fixed pulley and the second fixed pulley; the sliding direction of the movable pulley is perpendicular to the connecting line between the circle center of the first fixed pulley and the circle center of the second fixed pulley, the movable pulley is connected with a tensioning spring, the tensioning spring is arranged in the sliding direction of the movable pulley, and under the elastic action of the tensioning spring, the movable pulley can be pulled to straighten a suture line without additional adjustment; and the operation efficiency is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of textile machinery, in particular to a quilting machine sewing thread tensioning mechanism. Background Art

[0002] A quilting machine is a textile machine used to sew patterns on the surface of fabrics such as bed sheets. The work of sewing patterns on the quilting machine is completed by a sewing machine head that can move in the XY direction and is set on a gantry. The sewing thread used to sew the pattern comes from the thread roller set on the sewing machine head.

[0003] A suture thread tensioning mechanism is usually arranged between the sewing head and the thread roller of the quilting machine. The tensioning mechanism is composed of a number of fixed pulleys. The suture thread between the sewing machine head and the thread roller passes through the several fixed pulleys. The resistance when the fixed pulleys rotate is used to provide tensioning force for the suture thread, so that the suture thread is tensioned and straightened to prevent entanglement. Because the fixed pulleys are all fixed, the operator needs to hold the suture thread by hand and carefully pass it between the fixed pulleys in turn when setting the suture thread. After the winding is completed, it is also necessary to adjust the suture thread according to the excess length of the suture thread to avoid the excess suture thread from being entangled and knotted. There are many steps and the operating efficiency is low. Moreover, because it is manually adjusted and there is no fixed standard, entanglement accidents may still occur if the suture thread is not completely straightened. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a quilting machine sewing thread tensioning mechanism.

[0005] The technical solution of the utility model is as follows:

[0006] A quilting machine suture thread tensioning mechanism is arranged on a sewing machine head, the tensioning mechanism includes a fixed frame, a mounting plate and a pulley block, one end of the fixed frame is fixedly connected to the outer surface of the sewing machine head, and the other end is fixedly connected to the mounting plate, and is used to fix the mounting plate to the outer surface of the sewing machine head, the pulley block includes a first fixed pulley, a movable pulley and a second fixed pulley, the first fixed pulley and the second fixed pulley are both rotatably connected to the mounting plate, and the rotating axes of the first fixed pulley and the second fixed pulley are arranged parallel to each other up and down, so that The movable pulley is slidably connected between the first fixed pulley and the second fixed pulley, and the sliding direction of the movable pulley is perpendicular to the line between the centers of the first fixed pulley and the second fixed pulley. The movable pulley is connected with a tensioning spring, and the tensioning spring is arranged along the sliding direction of the movable pulley. The tensioning spring is used to provide additional tensioning force, and the tensioning stroke is increased. Even if the suture thread passing through the pulley group is too long, the movable pulley can be pulled to straighten the suture thread under the elastic action of the tensioning spring, and no additional adjustment is required, so the operation efficiency is higher.

[0007] In order to enable the movable pulley to be slidably connected to the mounting plate, the mounting plate is provided with a sliding hole between the first fixed pulley and the second fixed pulley. The shape of the sliding hole includes a long strip. The setting direction of the sliding hole is perpendicular to the line between the centers of the first fixed pulley and the second fixed pulley. The width of the sliding hole is not less than the diameter of the rotating shaft of the movable pulley.

[0008] Furthermore, in order to ensure the stability of the movable pulley when sliding, a guide module is provided on the surface of the mounting plate on one side away from the pulley group, and the guide module includes an upper slide rail, a lower slide rail and a sliding block. The upper slide rail is arranged above the sliding hole and is arranged along the length direction of the sliding hole. The lower slide rail is arranged below the sliding hole and is also arranged along the length direction of the sliding hole. The sliding block is slidably connected between the upper slide rail and the lower slide rail, and the rotating shaft of the movable pulley is vertically fixedly connected to the sliding block.

[0009] In order to enable the sliding block to slide on the upper sliding rail and the lower sliding rail, the upper sliding rail and the lower sliding rail are both provided with raised guide rails on their surfaces facing the sliding block, and the cross-sectional shape of the guide rails includes a semicircular shape. Guide rail grooves are provided at positions where the upper and lower sides of the sliding block contact the upper sliding rail and the lower sliding rail, and the cross-sectional shape of the guide rail grooves matches the cross-sectional shape of the guide rails.

[0010] In order to reduce the friction force when the sliding block slides and reduce the resistance when the movable pulley straightens the suture line, the guide rail is made of polyoxymethylene material.

[0011] Furthermore, in order to enable the movable pulley to be elastically reset and thus tension the suture, a fixing pin is provided at one end of the sliding hole away from the first fixed pulley and the second fixed pulley, and the fixing pin is vertically fixedly connected to the mounting plate, one end of the tensioning spring is connected to the fixing pin, and the other end is connected to the sliding block.

[0012] In order to facilitate the movement of the movable pulley, an end of the rotating shaft of the movable pulley away from the mounting plate is coaxially connected with an adjustment handle, and the outer surface of the adjustment handle is provided with anti-slip grooves.

[0013] In order to enable the tensioning mechanism to be firmly fixed on the sewing machine head, the fixing frame includes a fixed base and a support rod. The fixed base is connected to the outer surface of the sewing machine head by bolts, one end of the support rod is vertically fixed to the surface of the fixed base, and the other end is connected to the mounting plate by bolts.

[0014] The sewing machine head will generate vibrations during the process of moving and sewing patterns. In order to reduce the influence of the vibrations on the pulley block tensioning the suture line, a buffer pad is provided on the side of the fixed base away from the support rod, and the buffer pad is made of rubber.

[0015] In order to ensure the buffering effect of the buffer pad while preventing the buffer pad from being too thin to affect the stability of the installation of the tensioning mechanism, the thickness of the buffer pad is 3-8 mm.

[0016] The beneficial effects of the utility model are:

[0017] The utility model discloses a suture thread tensioning mechanism for a quilting machine, wherein the pulley block of the tensioning mechanism adopts a movable pulley and a fixed pulley in combination to provide tensioning force for the suture thread, thereby straightening the suture thread to avoid entanglement. Compared with the traditional tensioning mechanism, in addition to utilizing the rotational resistance of the pulley to provide the tensioning force, the elasticity of the tensioning spring is also utilized to provide the tensioning force. After the suture thread passes through the pulley block of the tensioning mechanism, the excess suture thread can be pulled by the movable pulley connected to the tensioning spring, thereby straightening the suture thread, and manual adjustment is no longer needed. While effectively improving the efficiency of the suture threading operation, entanglement of the suture thread due to too small tensioning force is also avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By reading the detailed description of the preferred embodiment below, the scheme and advantages of the present application will become clear to those skilled in the art. The accompanying drawings are only used to illustrate the preferred embodiment and are not considered to be limiting of the present invention.

[0019] In the attached picture:

[0020] Figure 1 This is a structural schematic diagram of a quilting machine suture thread tensioning mechanism described herein;

[0021] Figure 2 is a schematic diagram of the back structure of the mounting plate;

[0022] Figure 3 is a structural schematic diagram of the pulley block;

[0023] 1. Fixed frame; 11. Fixed base; 12. Support rod; 13. Buffer pad; 2. Mounting plate; 21. Sliding hole; 22. Guide module; 23. Upper slide rail; 24. Lower slide rail; 25. Sliding block; 26. Guide rail strip; 27. Guide rail groove; 3. Pulley block; 31. First fixed pulley; 32. Movable pulley; 33. Second fixed pulley; 34. Tensioning spring; 35. Fixing pin; 36. Adjustment handle. DETAILED DESCRIPTION

[0024] See also Figure 1-Figure 3, a quilting machine suture thread tensioning mechanism is arranged on a sewing machine head and is used to straighten the suture thread. The tensioning mechanism includes a fixed frame 1, a mounting plate 2 and a pulley group 3. One end of the fixed frame 1 is fixedly connected to the outer surface of the sewing machine head, and the other end is fixedly connected to the mounting plate 2, and is used to fix the mounting plate 2 to the outer surface of the sewing machine head. The pulley group 3 includes a first fixed pulley 31, a movable pulley 32 and a second fixed pulley 33. The first fixed pulley 31 and the second fixed pulley 33 are both rotatably connected to the mounting plate 2. The rotating axes of the first fixed pulley 31 and the second fixed pulley 33 are arranged parallel to each other up and down. The movable pulley 32 is slidably connected between the first fixed pulley 31 and the second fixed pulley 33, and the sliding direction of the movable pulley 32 is perpendicular to the line between the centers of the first fixed pulley 31 and the second fixed pulley 33. A tensioning spring 34 is connected to the movable pulley 32, and the tensioning spring 34 is arranged along the sliding direction of the movable pulley 32. When the suture is set to pass through the tensioning mechanism, the movable pulley 32 can be moved close to the first fixed pulley 31 and the second fixed pulley 33 to slide, and then the suture is passed from the left side of the upper first fixed pulley 31, then from the right side of the movable pulley 32, and then from the left side of the lower second fixed pulley 33, and finally the fixation of the movable pulley 32 is released. Under the elastic action of the tensioning spring 34, the movable pulley 32 can drive the suture to slide in the direction away from the first fixed pulley 31 and the second fixed pulley 33, so as to straighten the suture passed through the tensioning mechanism. Moreover, because the tensioning spring 34 is used to provide additional tensioning force, the tensioning stroke is increased. Even if the suture passing through the pulley block 3 is too long, under the elastic action of the tensioning spring 34, the movable pulley 32 can be pulled to straighten the suture, and no additional adjustment is required, which has higher operation efficiency.

[0025] In order to enable the movable pulley 32 to be slidably connected to the mounting plate 2, see Figure 1 and Figure 2 The mounting plate 2 is provided with a sliding hole 21 between the first fixed pulley 31 and the second fixed pulley 33. The shape of the sliding hole 21 includes a long strip. The setting direction of the sliding hole 21 is perpendicular to the line between the centers of the first fixed pulley 31 and the second fixed pulley 33. The width of the sliding hole 21 is not less than the diameter of the rotating shaft of the movable pulley 32, so that the movable pulley 32 can slide along the setting direction of the sliding hole 21.

[0026] Furthermore, in order to ensure the stability of the movable pulley 32 when sliding, a guide module 22 is provided on the surface of the mounting plate 2 on one side away from the pulley block 3, and the guide module 22 includes an upper slide rail 23, a lower slide rail 24 and a sliding block 25. The upper slide rail 23 is arranged above the sliding hole 21 and arranged along the length direction of the sliding hole 21, and the lower slide rail 24 is arranged below the sliding hole 21 and also arranged along the length direction of the sliding hole 21. The sliding block 25 is slidably connected between the upper slide rail 23 and the lower slide rail 24, and the rotating shaft of the movable pulley 32 is vertically fixedly connected to the sliding block 25. The arrangement of the guide module 22 can make the sliding of the sliding block 25 more stable and smooth.

[0027] In order to enable the sliding block 25 to slide on the upper slide rail 23 and the lower slide rail 24, the upper slide rail 23 and the lower slide rail 24 are both provided with raised guide rails 26 on the surface facing the sliding block 25, and the cross-sectional shape of the guide rail 26 includes a semicircular shape. The upper and lower sides of the sliding block 25 are provided with guide rail grooves 27 at the positions where the upper slide rail 23 and the lower slide rail 24 contact each other, and the cross-sectional shape of the guide rail groove 27 matches the cross-sectional shape of the guide rail 26. After the guide rails 26 of the upper slide rail 23 and the lower slide rail 24 are embedded in the guide rail grooves 27 of the sliding block 25, the sliding direction of the sliding block 25 can be limited, so that the sliding block 25 can only slide along the length direction of the upper slide rail 23 and the lower slide rail 24.

[0028] In order to reduce the friction force when the sliding block 25 slides and reduce the resistance of the movable pulley 32 when straightening the suture line, the guide bar 26 is made of polyformaldehyde material. Polyformaldehyde material has good self-lubricating properties and can reduce the friction force between the guide bar 26 and the inner wall of the guide groove 27, so that the sliding block 25 can slide between the upper slide rail 23 and the lower slide rail 24 more smoothly.

[0029] Furthermore, in order to enable the movable pulley 32 to be elastically reset and thus tension the suture, a fixing pin 35 is provided at one end of the sliding hole 21 away from the first fixed pulley 31 and the second fixed pulley 33, and the fixing pin 35 is vertically fixedly connected to the mounting plate 2, one end of the tensioning spring 34 is connected to the fixing pin 35, and the other end is connected to the sliding block 25, so that the movable pulley 32 tensions the suture under the elastic force of the tensioning spring 34.

[0030] In order to facilitate the movement of the movable pulley 32, see Figure 3 An adjustment handle 36 is coaxially connected to one end of the rotating shaft of the movable pulley 32 away from the mounting plate 2, and an anti-slip pattern is provided on the outer surface of the adjustment handle 36. The setting of the adjustment handle 36 can facilitate the operator to slide and adjust the movable pulley 32, and the setting of the anti-slip pattern can facilitate the operator to grasp the adjustment handle 36.

[0031] In order to enable the tensioning mechanism to be firmly fixed on the sewing machine head, the fixing frame 1 includes a fixing base 11 and a support rod 12. The fixing base 11 is connected to the outer surface of the sewing machine head by bolts. One end of the support rod 12 is vertically fixedly connected to the surface of the fixing base 11, and the other end is connected to the mounting plate 2 by bolts. The structural setting of the fixing frame 1 can stably fix the tensioning mechanism on the outer surface of the sewing machine head.

[0032] The sewing machine head will vibrate during the process of moving the sewing pattern. In order to reduce the influence of the vibration on the tensioning of the suture thread by the pulley block 3, see Figure 1 A buffer pad 13 is provided on the side of the fixed base 11 away from the support rod 12. The buffer pad 13 is made of rubber. The setting of the buffer pad 13 can reduce the influence of the vibration of the sewing machine head on the pulley block 3, and ensure the effect of the pulley block 3 in tensioning the suture line.

[0033] In order to ensure the buffering effect of the impact pad while preventing the buffer pad 13 from being too thin and affecting the stability of the installation of the tensioning mechanism, the thickness of the buffer pad 13 is 3-8 mm. The thickness setting of the buffer pad 13 can prevent the buffer pad 13 from being too thin and affecting the buffering performance of the buffer pad 13, and also prevent the buffer pad 13 from being too thick and affecting the stability of the installation of the tensioning mechanism on the sewing machine head, and prevent the tensioning mechanism from tilting due to the elasticity of the buffer pad 13 and affecting its tensioning effect on the suture line.

Claims

1. A quilting machine sewing thread tensioning mechanism, arranged on a sewing machine head, characterized in that: The tensioning mechanism comprises a fixed frame (1), a mounting plate (2) and a pulley block (3), wherein one end of the fixed frame (1) is fixedly connected to the outer surface of the sewing machine head, and the other end is fixedly connected to the mounting plate (2); the pulley block (3) comprises a first fixed pulley (31), a movable pulley (32) and a second fixed pulley (33); the first fixed pulley (31) and the second fixed pulley (33) are both rotatably connected to the mounting plate (2); the rotation axes of the first fixed pulley (31) and the second fixed pulley (33) are arranged vertically parallel; the movable pulley (32) is slidably connected between the first fixed pulley (31) and the second fixed pulley (33); and the sliding direction of the movable pulley (32) is perpendicular to a line connecting the centers of the first fixed pulley (31) and the second fixed pulley (33); and a tensioning spring (34) is connected to the movable pulley (32); and the tensioning spring (34) is arranged along the sliding direction of the movable pulley (32).

2. A quilting machine suture thread tensioning mechanism according to claim 1, characterized in that: The mounting plate (2) is provided with a sliding hole (21) between the first fixed pulley (31) and the second fixed pulley (33); the shape of the sliding hole (21) comprises a long strip; the setting direction of the sliding hole (21) is perpendicular to the line between the centers of the first fixed pulley (31) and the second fixed pulley (33); and the width of the sliding hole (21) is not less than the diameter of the rotating shaft of the movable pulley (32).

3. A quilting machine suture thread tensioning mechanism according to claim 2, characterized in that: A guide module (22) is provided on a surface of one side of the mounting plate (2) away from the pulley block (3), and the guide module (22) comprises an upper slide rail (23), a lower slide rail (24) and a sliding block (25), wherein the upper slide rail (23) is arranged above the sliding hole (21) and along the length direction of the sliding hole (21), and the lower slide rail (24) is arranged below the sliding hole (21) and also along the length direction of the sliding hole (21), and the sliding block (25) is slidably connected between the upper slide rail (23) and the lower slide rail (24), and the rotating shaft of the movable pulley (32) is vertically fixedly connected to the sliding block (25).

4. A quilting machine sewing thread tensioning mechanism according to claim 3, characterized in that: The upper slide rail (23) and the lower slide rail (24) are both provided with a raised guide rail strip (26) on the surface facing the sliding block (25), and the cross-sectional shape of the guide rail strip (26) includes a semicircular shape. The upper and lower sides of the sliding block (25) are provided with guide rail grooves (27) at positions where the upper slide rail (23) and the lower slide rail (24) are in contact, and the cross-sectional shape of the guide rail groove (27) matches the cross-sectional shape of the guide rail strip (26).

5. A quilting machine suture thread tensioning mechanism according to claim 4, characterized in that: The guide rail (26) is made of polyoxymethylene material.

6. A quilting machine sewing thread tensioning mechanism according to claim 5, characterized in that: A fixing pin (35) is provided at one end of the sliding hole (21) away from the first fixed pulley (31) and the second fixed pulley (33); the fixing pin (35) is vertically fixedly connected to the mounting plate (2); one end of the tensioning spring (34) is connected to the fixing pin (35) and the other end is connected to the sliding block (25).

7. The quilting machine sewing thread tensioning mechanism according to claim 1, characterized in that: An end of the rotating shaft of the movable pulley (32) away from the mounting plate (2) is coaxially connected to an adjustment handle (36), and an outer surface of the adjustment handle (36) is provided with anti-slip grooves.

8. The quilting machine sewing thread tensioning mechanism according to claim 1, characterized in that: The fixing frame (1) comprises a fixing base (11) and a support rod (12); the fixing base (11) is connected to the outer surface of the sewing machine head via bolts; one end of the support rod (12) is vertically fixedly connected to the surface of the fixing base (11), and the other end is connected to the mounting plate (2) via bolts.

9. A quilting machine sewing thread tensioning mechanism according to claim 8, characterized in that: A buffer pad (13) is provided on the side of the fixed base (11) away from the support rod (12), and the buffer pad (13) is made of rubber.

10. A quilting machine sewing thread tensioning mechanism according to claim 9, characterized in that: The thickness of the buffer pad (13) is 3-8 mm.

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