Cloth tensioning device of sewing machine

Abstract

The utility model relates to the technical field of sewing machines, and discloses a sewing machine cloth tensioning device which comprises a bottom plate, a sewing machine body fixedly connected to the upper end of the bottom plate, rotating rods arranged at the top and the bottom of the inner wall of a placing box, a first winding ring arranged between the two rotating rods, and a ratchet wheel arranged in the first winding ring. A pawl is hinged to the bottom of the first winding coil through a pin, and a second winding coil is fixedly connected to the upper end of the sliding block. According to the tightening device of the sewing machine, the sewing thread is wound on the outer surface of the first winding ring, then the thread end of the sewing thread penetrates through the thread outlet hole, the pawl can be embedded between the other two ratchets, and therefore the pawl can complete positioning, the situation that feeding of the sewing thread cannot be stopped is avoided, and the sewing thread tightening device is convenient to use. When the sewing machine is used, the sewing thread coming out of the thread outlet hole passes through the second winding ring and then reaches the sewing machine body, so that the sliding block can be positioned, the second winding ring at the upper end is fixed, and the sewing thread can be tightly supported.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a cloth tightening device for sewing machines. Background Art

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so that one or more layers of sewing materials are interwoven or sewn together. Sewing machines can sew cotton, linen, silk, wool, artificial fiber and other fabrics and leather, plastic, paper and other products. The stitches are neat, beautiful, flat and firm, with fast sewing speed and easy use. It has also derived art forms such as hand-push embroidery and computer embroidery.

[0003] When the sewing machine is in sewing operation, the thread feeding and rotating coil of the sewing machine is pulled to rotate. When the sewing machine stops, the coil that is pulled to rotate cannot stop feeding and rotating immediately due to inertia, resulting in loose sewing thread. When the sewing machine is run again, the thread is easily tangled, which is inconvenient to operate and use. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a fabric tensioning device for a sewing machine, which can avoid being unable to stop thread feeding by using a ratchet wheel and improve the tensioning effect by moving a slider, thereby solving the above technical problems.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a fabric tightening device for a sewing machine, comprising a base plate, the upper end of the base plate is fixedly connected to a sewing machine body, the upper end of the sewing machine body is fixedly connected to a placement box, the top and bottom of the inner wall of the placement box are provided with rotating rods, a first winding coil is provided between the two rotating rods, a ratchet is provided inside the first winding coil, and a pawl is hinged at the bottom of the first winding coil through a pin, a first spring is fixedly connected to the outer surface of the pawl, a straight groove is provided on the upper surface of the sewing machine body, a slider is slidably connected inside the straight groove, a spring groove is provided on one side of the slider, and a second winding coil is fixedly connected to the upper end of the slider.

[0006] Preferably, a wire outlet hole is formed through one side of the placement box.

[0007] Through the above technical solution, the sewing thread is wound on the first winding coil, and the thread end of the sewing thread passes through the inside of the thread outlet hole, and then the first winding coil feeds the thread to the sewing machine body, and the sewing thread passes through the thread outlet holes in turn to reach the sewing machine body.

[0008] Preferably, the lower end of the ratchet is fixedly connected to the bottom of the inner wall of the placement box by penetrating the bottom surface of the first winding coil.

[0009] Through the above technical solution, the lower end of the ratchet is fixedly connected to the bottom of the inner wall of the placement box by passing through the lower surface of the first winding coil, that is, the ratchet is fixed, and the first winding coil can rotate inside the placement box, while the ratchet inside the first winding coil is fixed.

[0010] Preferably, the ratchet cooperates with a pawl, and the first spring is located between the inner wall of the first winding coil and the outer surface of the pawl.

[0011] Through the above technical scheme, when the sewing thread is wound on the outer surface of the first winding coil, and the end of the sewing thread is passed through the hole directly to the needle, and then the sewing machine body is working, the sewing machine body can drive the sewing thread, and the sewing thread drives the first winding coil to rotate, and the first winding coil drives the internal pawl to rotate, and the pawl and ratchet cooperate with each other, that is, the pawl disengages from the gap between the ratchet teeth on the ratchet wheel, so that the pawl can be embedded in between the other two ratchet teeth, so that the pawl can complete the positioning, thereby avoiding the situation that when the sewing machine body stops, the first winding coil cannot stop feeding the sewing thread due to the inertia.

[0012] Preferably, the straight groove is provided with a plurality of slots at equal intervals on the inner wall of one side close to the spring groove.

[0013] Through the above technical solution, the slider can slide inside the straight groove, and the inner wall of one side of the straight groove is provided with equidistant slots, and the slider is provided with spring slots of equal diameter on the side close to the slots.

[0014] Preferably, a second spring is arranged inside the spring groove, a locking ball is arranged at the front end of the second spring, and the locking groove cooperates with the locking ball.

[0015] Through the above technical solution, the sewing thread coming out of the wire outlet hole passes through the second winding coil and then reaches the sewing machine body. When the slider is pushed to slide inside the straight groove, the card ball inside the spring groove can be separated from the inside of the card slot, so that the slider can move. At this time, when the card ball contacts the inner wall of the straight groove, the card ball can compress the second spring until the slider moves to a suitable position. The card ball will be driven by the second spring to enter the inside of the card slot, so that the slider can be positioned, and then the second winding coil at the upper end can be moved, so that the sewing thread can be tightened.

[0016] Compared with the prior art, the utility model provides a cloth tightening device for a sewing machine, which has the following beneficial effects:

[0017] 1. The utility model provides components such as a pawl and a ratchet. When the sewing thread is wound around the outer surface of the first winding coil and the thread end of the sewing thread is passed through the hole to reach the needle, and then the sewing machine body is working, the sewing thread can be driven by the sewing machine body, and the sewing thread drives the first winding coil to rotate, and the first winding coil drives the internal pawl to rotate, and the pawl and the ratchet cooperate with each other, that is, the pawl is separated from the gap between the ratchet teeth on the ratchet wheel, so that the pawl can be embedded in between the other two ratchet teeth, so that the pawl can complete the positioning, thereby avoiding the situation that the sewing thread cannot stop feeding due to the inertia of the first winding coil when the sewing machine body stops.

[0018] 2. The utility model uses components such as a slider and a card ball to allow the sewing thread coming out of the wire outlet to pass through the second winding coil and then reach the sewing machine body. When the slider is pushed to slide inside the straight groove, the card ball inside the spring groove can be separated from the inside of the card slot, so that the slider can move. At this time, when the card ball contacts the inner wall of the straight groove, the card ball can compress the second spring until the slider moves to a suitable position. The card ball will be driven by the second spring to enter the inside of the card slot, so that the slider can be positioned, and then the second winding coil at the upper end can be fixed, so that the sewing thread can be tightened. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of the structure of the utility model;

[0020] Figure 2 It is a partial cross-sectional schematic diagram of the spring slot and other components of the utility model structure;

[0021] Figure 3 It is a partial cross-sectional schematic diagram of the ratchet and other components of the utility model structure.

[0022] Among them: 1. bottom plate; 2. sewing machine body; 3. placement box; 4. rotating rod; 5. first winding coil; 6. ratchet; 7. pawl; 8. first spring; 9. straight groove; 10. slider; 11. spring groove; 12. second winding coil; 13. slot; 14. second spring; 15. clamping ball; 31. wire outlet hole. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-3A fabric tightening device for a sewing machine comprises a bottom plate 1, a sewing machine body 2 is fixedly connected to the upper end of the bottom plate 1, a placement box 3 is fixedly connected to the upper end of the sewing machine body 2, a rotating rod 4 is arranged at the top and bottom of the inner wall of the placement box 3, a first winding coil 5 is arranged between the two rotating rods 4, a ratchet 6 is arranged inside the first winding coil 5, and a pawl 7 is hinged at the bottom of the first winding coil 5 through a pin, a first spring 8 is fixedly connected to the outer surface of the pawl 7, a straight groove 9 is arranged on the upper surface of the sewing machine body 2, a slider 10 is slidably connected inside the straight groove 9, a spring groove 11 is opened on one side of the slider 10, and a second winding coil 12 is fixedly connected to the upper end of the slider 10.

[0025] Specifically, a thread outlet hole 31 is formed through one side of the placement box 3. The advantage is that the sewing thread is wound on the first winding coil 5, and then the thread end of the sewing thread passes through the inside of the thread outlet hole 31, and then the first winding coil 5 feeds the thread to the sewing machine body 2, and the sewing thread passes through the thread outlet hole 31 in turn to reach the sewing machine body 2.

[0026] Specifically, the lower end of the ratchet 6 is fixedly connected to the bottom of the inner wall of the placement box 3 by passing through the bottom surface of the first winding coil 5. The advantage is that the lower end of the ratchet 6 is fixedly connected to the bottom of the inner wall of the placement box 3 by passing through the lower surface of the first winding coil 5, that is, the ratchet 6 is fixed, the first winding coil 5 can rotate inside the placement box 3, and at the same time, the ratchet 6 inside the first winding coil 5 is fixed.

[0027] Specifically, the ratchet 6 cooperates with the pawl 7, and the first spring 8 is located between the inner wall of the first winding coil 5 and the outer surface of the pawl 7. The advantage is that when the sewing thread is wound on the outer surface of the first winding coil 5, and the thread end of the sewing thread passes through the thread outlet hole 31 directly to the needle, and then the sewing machine body 2 is working, the sewing machine body 2 can drive the sewing thread, and the sewing thread drives the first winding coil 5 to rotate, and the first winding coil 5 drives the internal pawl 7 to rotate, and the pawl 7 cooperates with the ratchet 6, that is, the pawl 7 is separated from the gap between the ratchet teeth on the ratchet 6, so that the pawl 7 can be embedded between the other two ratchet teeth, so that the pawl 7 can complete the positioning, thereby avoiding the situation that when the sewing machine body 2 stops, the first winding coil 5 cannot stop feeding the sewing thread due to the inertia.

[0028] Specifically, the straight groove 9 is provided with a plurality of slots 13 at equal intervals on the inner wall of one side close to the spring groove 11. The advantage is that the slider 10 can slide inside the straight groove 9, and the slots 13 are provided at equal intervals on the inner wall of one side of the straight groove 9, and the slider 10 is provided with a spring groove 11 of equal diameter on the side close to the slot 13.

[0029] Specifically, a second spring 14 is provided inside the spring slot 11, a catch ball 15 is provided at the front end of the second spring 14, and the catch slot 13 cooperates with the catch ball 15. The advantage is that the sewing thread coming out of the outlet hole 31 passes through the second winding coil 12 and then reaches the sewing machine body 2. When the slider 10 is pushed to slide inside the straight slot 9, the catch ball 15 inside the spring slot 11 can be separated from the inside of the catch slot 13, so that the slider 10 can move. At this time, when the catch ball 15 contacts the inner wall of the straight slot 9, the catch ball 15 can compress the second spring 14 until the slider 10 moves to a suitable position. The catch ball 15 will be driven by the second spring 14 to enter the inside of the catch slot 13, so that the slider 10 can be positioned, and then the second winding coil 12 at the upper end is fixed, so that the sewing thread can be tightened.

[0030] When in use, by winding the sewing thread on the outer surface of the first winding coil 5, and then passing the end of the sewing thread through the thread outlet hole 31, when the sewing machine body 2 is working, the sewing thread can be driven by the sewing machine body 2, and the sewing thread drives the first winding coil 5 to rotate, and the first winding coil 5 drives the internal pawl 7 to rotate, and the pawl 7 and the ratchet 6 cooperate with each other, that is, the pawl 7 is separated from the gap between the ratchet teeth on the ratchet 6, so that the pawl 7 can be embedded in between the other two ratchet teeth, so that the pawl 7 can complete the positioning, thereby avoiding the situation that the sewing thread cannot stop feeding due to the inertia of the first winding coil 5 when the sewing machine body 2 stops, thereby improving the practicality of the sewing machine body 2. The sewing thread coming out of the wire outlet hole 31 passes through the second winding coil 12 and then reaches the sewing machine body 2. When the slider 10 is pushed to slide inside the straight groove 9, the card ball 15 inside the spring groove 11 can be separated from the inside of the card groove 13, so that the slider 10 can move. At this time, when the card ball 15 contacts the inner wall of the straight groove 9, the card ball 15 can compress the second spring 14 until the slider 10 moves to a suitable position. The card ball 15 will be driven by the second spring 14 to enter the inside of the card groove 13, so that the slider 10 can be positioned, and then the second winding coil 12 at the upper end is fixed, so that the sewing thread can be tightened.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cloth tensioning device for a sewing machine, comprising a bottom plate (1), characterized in that: The upper end of the bottom plate (1) is fixedly connected to a sewing machine body (2), the upper end of the sewing machine body (2) is fixedly connected to a placement box (3), the top and bottom of the inner wall of the placement box (3) are both provided with rotating rods (4), a first winding coil (5) is provided between the two rotating rods (4), a ratchet (6) is provided inside the first winding coil (5), and a pawl (7) is hinged at the bottom of the first winding coil (5) through a pin, the outer surface of the pawl (7) is fixedly connected to a first spring (8), a straight groove (9) is provided on the upper surface of the sewing machine body (2), a slider (10) is slidably connected inside the straight groove (9), a spring groove (11) is provided on one side of the slider (10), and the upper end of the slider (10) is fixedly connected to a second winding coil (12).

2. A cloth tensioning device for a sewing machine according to claim 1, characterized in that: A wire outlet hole (31) is formed through one side of the placement box (3).

3. A cloth tensioning device for a sewing machine according to claim 1, characterized in that: The lower end of the ratchet (6) is fixedly connected to the bottom of the inner wall of the placement box (3) by penetrating the bottom surface of the first winding coil (5).

4. A cloth tensioning device for a sewing machine according to claim 1, characterized in that: The ratchet (6) cooperates with the pawl (7), and the first spring (8) is located between the inner wall of the first winding coil (5) and the outer surface of the pawl (7).

5. A cloth tensioning device for a sewing machine according to claim 1, characterized in that: The straight groove (9) is provided with a plurality of slots (13) at equal intervals on the inner wall of one side close to the spring groove (11).

6. A cloth tensioning device for a sewing machine according to claim 5, characterized in that: A second spring (14) is arranged inside the spring slot (11), a locking ball (15) is arranged at the front end of the second spring (14), and the locking slot (13) cooperates with the locking ball (15).

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