Thread channel capable of reducing upper thread tension and sewing machine

Abstract

The utility model discloses a thread channel capable of reducing upper thread tension and a sewing machine in the technical field of sewing machines. The thread channel comprises a machine head and a needle bar, a left thread hook is installed on one side of the machine head, a needle bar thread hook is installed at the bottom end of the needle bar, a lining thread hook is installed below the machine head, and the thread channel of the left thread hook, the thread channel of the lining thread hook and the thread channel of the needle bar thread hook are collinear. According to the utility model, the linear thread channel is adopted, so that the overall frictional resistance of the left thread channel to the upper thread is reduced, and the thread clamping force required by the large thread trapper in the right thread channel is reduced, thereby reducing the risk of thread breakage and improving the sewing effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewing machine technical field, concretely relates to a thread channel and sewing machine that can reduce face line tension. BACKGROUND

[0002] The existing sewing machine is all through the motor driving main shaft rotation, and then drive threader thread cooperation needle, shuttle sewing when sewing. Figures 12-14 As shown, during sewing, the face line passes through the thread rack-three eyelet thread hook-small thread clipper 14-large thread clipper 15-fixed type thread guide 16-right thread hook 17-threader 13-left thread hook 3-electronic thread clipper 12-needle bar lower bushing thread hook-needle bar thread hook 4-needle 2; in the process of taking up the thread, the threader 13 moves from bottom to top, the face line 19 is first straightened, then the stitch at the tensioned cloth is pulled, and the thread is pulled from the large thread clipper 15, therefore, the appropriate face line tension needs to play the role of balancing the friction force generated by the face line passing through the cloth and the thread tension of the thread at the large thread clipper.

[0003] With the threader as the demarcation line, assuming that the left side of the threader (left thread hook-electronic thread clipper-needle bar lower bushing thread hook-needle-right cloth-shuttle) is the tension thread channel required for sewing, and the right side of the threader (thread rack-three eyelet thread hook-small thread clipper-large thread clipper-right thread hook) is the tension thread channel for providing tension. When the threader threads the cloth stitch to tension, at this time, the left tension of the threader = the right tension, then the sewing effect is best in this area; if the left tension of the threader > the right tension at this time, the thread will be pulled from the right to the left, and the sewing thread will be easily over-supplied, then the situation of floating thread or throwing thread will occur; if the left tension of the threader < the right tension at this time, the thread will be pulled from the left to the right, and the sewing stitch will be further tensioned, then the situation of cloth wrinkling will occur. In addition, the face line is affected by the frictional resistance of the thread channel (thread rack-three eyelet thread hook-small thread clipper-large thread clipper-right thread hook-threader-left thread hook-electronic thread clipper-needle bar lower bushing thread hook-needle-needle bar thread hook-needle) when sewing, and when the tension is too large, there is a risk of breaking the face line.

[0004] In the prior art, the existing thread channel is prone to the situation that the left tension of the threader > the right tension, and needs to compensate by increasing the thread clamping force of the large thread clipper, but the large thread clipper will increase the risk of breaking the face line if the thread clamping force is too large.

[0005] Therefore, how to reduce the face line tension on the left side of the threader and avoid the occurrence of the face line breaking phenomenon has become a technical problem to be solved by those skilled in the art. SUMMARY

[0006] Therefore, the line channel capable of reducing the tension of the face thread is provided to solve the technical problem that the existing line channel easily causes the tension of the left side face thread to be greater than that of the right side face thread.

[0007] The technical scheme adopted by the utility model is: a line channel capable of reducing the tension of the face thread, comprising a head and a needle rod, the head is provided with a left thread hook on one side, the bottom end of the needle rod is provided with a needle rod thread hook, a bushing thread hook is arranged below the head, and the thread channels of the left thread hook, the bushing thread hook and the needle rod thread hook are collinear.

[0008] Preferably, the left thread hook comprises an upper guide part, and the thread channels of the upper guide part, the needle rod lower bushing thread hook and the needle rod thread hook are collinear.

[0009] Preferably, the left thread hook further comprises a lower guide part fixedly connected with the upper guide part, the lower guide part is located below the upper guide part, and the thread channel passes through the lower guide part.

[0010] Preferably, the needle rod thread hook comprises a connecting sleeve and a threading hook, the threading hook is located on one side of the connecting sleeve and is fixedly connected with the connecting sleeve, and a threading hole is formed in the threading hook.

[0011] Preferably, the axis direction of the threading hole is parallel to the axis direction of the needle rod.

[0012] Preferably, the needle rod thread hook comprises a connecting sleeve, an open slot is formed in the bottom end of the connecting sleeve, the open slot comprises a slot body part and an opening part, the slot body part extends along the circumferential direction of the connecting sleeve, the opening part extends along the axial direction of the connecting sleeve, and the top end of the opening part is fixedly connected with one end of the slot body part.

[0013] Preferably, the needle rod thread hook comprises a connecting sleeve, a threading hole is arranged in the bottom end of the connecting sleeve, and the threading hole is arranged along the radial direction of the connecting sleeve.

[0014] Preferably, the bushing thread hook is a needle rod lower bushing thread hook or a pressure rod lower bushing thread hook.

[0015] Preferably, the needle rod lower bushing thread hook comprises a fixed part, a U-shaped threading part and an operating part, one leg of the U-shaped threading part is fixedly connected with the fixed part, and the other leg of the U-shaped threading part is fixedly connected with the operating part.

[0016] Preferably, the U-shaped threading part is arranged along the radial direction of the fixed part.

[0017] Preferably, in the radial direction of the fixed part, the length dimension of the U-shaped threading part is 4.5mm-7mm, and the horizontal distance between the U-shaped threading part and the central axis of the fixed part is 12mm-14.5mm.

[0018] Preferably, the lower bushing wire hook of the pressure rod comprises a fixed part, a U-shaped threading part, an operating part and a connecting part, one end of the connecting part is fixedly connected with the fixed part, the other end of the connecting part is fixedly connected with one leg of the U-shaped threading part, the other leg of the U-shaped threading part is fixedly connected with the operating part, and the fixed part and the U-shaped threading part are located on the same side of the connecting part.

[0019] Preferably, the horizontal distance between the U-shaped threading part and the central axis of the fixed part is 29.3mm-33.8mm.

[0020] Preferably, an electronic thread clipper is mounted on one side of the machine head, the electronic thread clipper is located below the left wire hook, and the vertical distance between the electronic thread clipper and the main shaft is 60-65mm.

[0021] Preferably, a thread lifting lever is mounted on the top of the machine head, the left wire hook, the needle bar wire hook and the bushing wire hook are located on one lateral side of the thread lifting lever, and a small thread clipper, a large thread clipper, a fixed type thread buffer hook and a right wire hook are sequentially mounted on the other lateral side of the thread lifting lever along the conveying direction of the face thread.

[0022] The second purpose of the sewing machine is to provide a thread channel capable of reducing the tension of the face thread.

[0023] The sewing machine has the advantages that:

[0024] The sewing machine adopts the mode of reducing friction, arranges the thread channels of the left wire hook, the bushing wire hook and the needle bar wire hook in the same line, forms a straight line type thread channel between the left wire hook and the needle bar wire hook, reduces the number of contact points between the face thread and the thread channel, further reduces the friction between the thread channel and the face thread, reduces the tension of the face thread, reduces the thread clamping force required by the large thread clipper on the right side of the thread lifting lever, reduces the risk of thread breakage, and improves the sewing effect. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 Fig. 1 is a structural schematic view of the thread channel capable of reducing the tension of the face thread of the sewing machine;

[0026] Figure 2 Fig. 2 is a side view of the thread channel capable of reducing the tension of the face thread of the sewing machine;

[0027] Figure 3 Fig. 3 is a three-dimensional schematic view of the left wire hook;

[0028] Figure 4 Fig. 4 is a structural schematic view of the lower bushing wire hook of the needle bar of the sewing machine;

[0029] Figure 5 Fig. 5 is a structural schematic view of the needle bar wire hook of the sewing machine;

[0030] Figure 6 Figure 2 is a structure schematic view of the needle bar thread hook of the present application;

[0031] Figure 7 Figure 3 is a structure schematic view of the needle bar thread hook of the present application;

[0032] Figure 8 Figure 2 is a structure schematic view of the needle bar thread hook of the present application;

[0033] Figure 9 Figure 3 is a structure schematic view of the needle bar thread hook of the present application;

[0034] Figure 10 Figure 2 is a structure schematic view of the needle bar thread hook of the present application;

[0035] Figure 11 Figure 2 is a structure schematic view of the needle bar thread hook of the present application;

[0036] Figure 12 Figure 2 is a structure schematic view of the needle bar thread hook of the present application;

[0037] Figure 13 Figure 2 is a structure schematic view of the needle bar thread hook of the present application;

[0038] Figure 14 Figure 2 is a structure schematic view of the needle bar thread hook of the present application.

[0039] Explanation of reference numerals in the drawings:

[0040] 1, machine head; 2, needle bar; 3, left thread hook; 4, needle bar thread hook; 5, bushing thread hook; 6, connecting sleeve; 7, threading hook; 8, threading hole; 9, fixed part; 10, U-shaped threading part; 11, operating part; 12, electronic thread clipper; 13, thread lifting lever; 14, small thread clipper; 15, large thread clipper; 16, fixed thread tensioner; 17, right thread hook; 18, machine needle; 19, face thread; 20, connecting plate; 21, upper bottom plate; 22, lower bottom plate; 23, upper guide part; 24, lower guide part; 25, pressing rod; 26, connecting part; 27, open slot. DETAILED DESCRIPTION

[0041] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate the present application, and are not intended to limit the present application.

[0042] In the description of the utility model, it is necessary to explain that, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0043] In the description of the utility model, it is necessary to explain that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0044] In addition, in the description of the utility model, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0045] Embodiment, as shown in Figures 1-11 A thread channel capable of reducing the tension of the surface thread, comprising a head 1 and a needle rod 2, a left thread hook 3 is installed on one side of the head 1, a needle rod thread hook 4 is installed at the bottom end of the needle rod 2, a bushing thread hook 5 is installed below the head 1, and the thread channels of the left thread hook 3, the bushing thread hook 5 and the needle rod thread hook 4 are collinear.

[0046] The utility model adopts the mode of reducing friction force, and the thread channels of the left thread hook 3, the bushing thread hook 5 and the needle rod thread hook 4 are arranged in a straight line, thereby forming a straight line type thread channel between the left thread hook 3 and the needle rod thread hook 4, the number of contact points between the surface thread 19 and the thread channel can be reduced, thereby reducing the friction force between the thread channel and the surface thread 19, the tension of the surface thread is reduced, the clamping force required by the large thread clamp 15 on the right side of the thread lifting rod 13 is reduced, thereby reducing the risk of thread breakage and improving the sewing effect.

[0047] Specific embodiment 1, as shown in Figures 1-8 A thread channel capable of reducing the tension of the surface thread, comprising a head 1 and a needle rod 2.

[0048] A left thread hook 3 is installed on the front side of the head 1.

[0049] The bottom end of the needle rod 2 is provided with a needle rod thread hook 4, and a threading hole 8 is formed in the needle rod thread hook 4.

[0050] Specifically, as shown in Figure 5 The needle bar thread hook 4 includes a connecting sleeve 6 and a thread hook 7. The connecting sleeve 6 is capable of being sleeved on the bottom end of the needle bar 2 and is fixedly connected with the needle bar 2. The thread hook 7 is located at the right side of the connecting sleeve 6, and the left end of the thread hook 7 is fixedly connected with or integrally formed with the connecting sleeve 6. The thread hole 8 is formed on the thread hook 7, or the thread hook 7 and the connecting sleeve 6 enclose the thread hole 8, so as to increase the horizontal distance between the face thread 19 and the needle bar 2.

[0051] Preferably, the axis direction of the thread hole 8 is parallel to the axis direction of the needle bar 2, that is, the thread hook 7 is horizontally arranged, and the thread hole 8 penetrates the thread hook 7 in the vertical direction.

[0052] The sleeve thread hook 5 is arranged below the machine head 1, which is a needle bar lower sleeve thread hook. The needle bar lower sleeve thread hook is connected with the needle bar 2 (in the prior art: the needle bar 2 is sleeved with a needle bar lower sleeve, the needle bar lower sleeve is fixedly connected with the machine head 1, and one end of the needle bar lower sleeve thread hook is clamped on the needle bar lower sleeve). The thread channels of the left thread hook 3, the sleeve thread hook 5 and the needle bar thread hook 4 are collinear, that is, the thread path between the left thread hook 3, the sleeve thread hook 5 and the needle bar thread hook 4 is a straight line or approximately a straight line, so as to reduce the friction between the face thread 19 and the sleeve thread hook 5, and further reduce the tension of the face thread 19.

[0053] Specifically, as shown in Figure 4 The needle bar lower sleeve thread hook includes a fixed part 9, a U-shaped thread passing part 10 and an operating part 11. The fixed part 9 is capable of being clamped on the needle bar lower sleeve. The operating part 11 is used for clamping the sleeve thread hook 5 by the worker. One leg of the U-shaped thread passing part 10 is fixedly connected with the fixed part 9, and the other leg of the U-shaped thread passing part 10 is fixedly connected with the operating part 11. The U-shaped thread passing part 10 is arranged in the radial direction of the fixed part 9 as a whole, so as to increase the horizontal distance between the face thread 19 and the needle bar 2 when the face thread 19 is in the sleeve thread hook 5.

[0054] The reason for such arrangement is that, for the existing needle bar lower sleeve thread hook, the U-shaped thread passing part 10 is arranged in the tangential direction of the fixed part 9, so that the horizontal distance between the face thread 19 in the U-shaped thread passing part 10 and the needle bar 2 is fixedly unchanged. The thread path between the left thread hook 3 and the needle bar thread hook 4 is a broken line type, which will cause the friction between the face thread 19 and the needle bar lower sleeve thread hook to increase, that is, the tension of the face thread 19 will increase.

[0055] In the utility model, the U-shaped threading part 10 of the needle bar lower bushing thread hook is arranged along the radial direction of the needle bar 2, so that the face thread 19 threaded in the U-shaped threading part 10 can move in the radial direction of the needle bar 2, thereby increasing the horizontal distance between the face thread 19 and the needle bar 2, and further reducing the bending angle of the face thread 19 when passing through the needle bar lower bushing thread hook, so that the thread channel between the left thread hook 3 and the needle bar thread hook 4 is changed from a bending type to a linear type (approximately linear type), and further the friction between the face thread 19 and the needle bar lower bushing thread hook is reduced, that is, the tension of the face thread 19 is reduced.

[0056] Preferably, in the radial direction of the fixing part 9, the length dimension of the U-shaped threading part 10 is A, 4.5mm≤A≤7mm, that is, the groove length dimension of the U-shaped threading part 10 is 4.5mm-7mm, so that after the face thread passes through the U-shaped threading part 10, the horizontal distance between the face thread 19 and the axis of the needle bar 2 is B, 12mm≤B≤14.5mm.

[0057] A thread lifting rod 13 is installed on the top of the machine head 1, the left thread hook 3, the needle bar thread hook 4 and the bushing thread hook 5 are located on the transverse left side of the thread lifting rod 13, and the left thread hook 3, the needle bar thread hook 4 and the bushing thread hook 5 form the left thread channel of the face thread 19; a small thread clamp 14, a large thread clamp 15, a fixed type thread tensioner 16 and a right thread hook 17 are sequentially installed on the transverse right side of the thread lifting rod 13 along the conveying direction of the face thread 19, and the small thread clamp 14, the large thread clamp 15, the fixed type thread tensioner 16 and the right thread hook 17 form the right thread channel of the face thread 19.

[0058] Specific embodiment 2, as shown in Figures 1-8 A thread channel capable of reducing the tension of the face thread, comprising a machine head 1 and a needle bar 2.

[0059] A left thread hook 3 is installed on the front side of the machine head 1.

[0060] The bottom end of the needle bar 2 is fixedly connected with a needle bar thread hook 4.

[0061] Specifically, as shown in Figure 7 The needle bar thread hook 4 comprises a connecting sleeve 6, the connecting sleeve 6 can be sleeved on the bottom end of the needle bar 2 and is fixedly connected with the needle bar 2; an open slot 27 is formed at the bottom end of the connecting sleeve 6, the open slot 27 is located on the right side of the connecting sleeve 6, and the open slot 27 comprises a slot body part and an opening part, the slot body part extends along the circumferential direction of the connecting sleeve 6, the opening part extends along the axial direction of the connecting sleeve 6, and the top end of the opening part communicates with one end of the slot body part.

[0062] The reason for this arrangement is that the open slot 27 is arranged on the connecting sleeve 6 of the needle bar thread hook 4, which is more convenient for the threading operation of the face thread than arranging a threading hole 8 on the connecting sleeve 6.

[0063] A sleeve thread hook 5 is installed below the machine head 1, which is a needle bar lower sleeve thread hook and is connected with the needle bar 2.

[0064] Specifically, as shown in the drawings, the needle bar lower sleeve thread hook comprises a fixed part 9, a U-shaped threading part 10 and an operating part 11. Figure 4 The fixed part 9 can be clamped on the needle bar lower sleeve, and the operating part 11 is used for the staff to clamp the needle bar lower sleeve thread hook.The other leg of the U-shaped threading part 10 is fixedly connected with the operating part 11, and the U-shaped threading part 10 is arranged along the radial direction of the fixed part 9 as a whole, so as to increase the horizontal distance between the face thread 19 in the needle bar lower sleeve thread hook and the needle bar 2.

[0065] Therefore, the horizontal distance between the face thread 19 in the U-shaped threading part 10 and the needle bar 2 is fixedly unchanged, and the line path between the left thread hook 3 and the needle bar thread hook 4 becomes a broken line type, which will cause the friction between the face thread 19 and the needle bar lower sleeve thread hook to increase, that is, the tension of the face thread 19 will increase.

[0066] In the utility model, the U-shaped threading part 10 of the needle bar lower sleeve thread hook is arranged along the radial direction of the needle bar 2, so that the face thread 19 threaded in the U-shaped threading part 10 can move in the radial direction of the needle bar 2, thereby increasing the horizontal distance between the face thread 19 and the needle bar 2, and further reducing the bending angle of the face thread 19 when passing through the needle bar lower sleeve thread hook, so that the line path between the left thread hook 3 and the needle bar thread hook 4 changes from a bending type to a straight line type (approximately straight line type), thereby reducing the increase of the friction between the face thread 19 and the needle bar lower sleeve thread hook, that is, reducing the tension of the face thread 19.

[0067] Preferably, in the radial direction of the fixed part 9, the length dimension of the U-shaped threading part 10 is A, and 4.5mm≤A≤7mm, that is, the slot length dimension of the U-shaped threading part 10 is 4.5mm-7mm, so that after the face thread passes through the U-shaped threading part 10, the horizontal distance between the face thread 19 and the axis of the needle bar 2 is B, and 12mm≤B≤14.5mm.

[0068] Specific embodiment 3, as shown in the drawings, a line path capable of reducing the tension of the face thread, comprising a machine head 1 and a needle bar 2. Figure 6 , Figures 9-11

[0069] A left hook 3 is installed on the front side of the machine head 1. The left hook 3 is a single hook type, that is, only one guide part is provided on the left hook 3.

[0070] The bottom end of the needle bar 2 is fixedly connected to a needle bar hook 4, which has a thread hole 8.

[0071] Specifically, such as Figure 6 As shown, the needle bar hook 4 includes a connecting sleeve 6, which can be fitted onto the bottom end of the needle bar 2 and fixedly connected to the needle bar 2; a thread hole 8 is provided at the bottom end of the connecting sleeve 6, which is arranged along the radial direction of the connecting sleeve 6.

[0072] A bushing hook 5 is installed below the machine head 1. The bushing hook 5 is a lower bushing hook of the pressure bar, and one end of the lower bushing hook of the pressure bar is connected to the pressure bar 25 (in the prior art: a lower bushing of the pressure bar is fitted on the pressure bar 25, and the lower bushing of the pressure bar is fixedly connected to the machine head 1). The threads of the left hook 3, the bushing hook 5 and the needle bar hook 4 are collinear. That is, after the top thread 19 passes through the left hook 3, the bushing hook 5 and the thread hole 8 in sequence, the stitch of the top thread 19 between the left hook 3 and the bushing hook 5 is a straight line, thereby reducing the friction between the top thread 19 and the bushing hook 5, and thus reducing the tension of the top thread 19.

[0073] Specifically, such as Figure 11 As shown, the lower bushing hook of the pressure rod includes a fixing part 9, a U-shaped threading part 10, an operating part 11, and a connecting part 26. The fixing part is C-shaped and can be clamped onto the lower bushing of the pressure rod at the bottom of the machine head 1. The connecting part 26 is rod-shaped, with one end fixedly connected to one end of the fixing part 9 and the other end fixedly connected to one leg of the U-shaped threading part 10. The fixing part 9 and the U-shaped threading part 10 are located on the same side of the connecting part 26, and the angle between the extension direction of the connecting part 26 and the extension direction of the leg of the U-shaped threading part 10 is an obtuse angle, that is, the horizontal distance between the center lines of the U-shaped threading part 10 and the fixing part 9 increases from the leg of the U-shaped threading part 10 to the sealing end. The other leg of the U-shaped threading part 10 is fixedly connected to the operating part 11, and the operating part 11 is located on the side of the U-shaped threading part 10 away from the fixing part 9 and the connecting part 26.

[0074] Preferably, the horizontal distance between the central axis of the U-shaped threading part 10 and the fixing part 9 is 29.3 mm to 33.8 mm.

[0075] More preferably, an electronic wire clamp 12 is installed on the front side of the machine head 1. The electronic wire clamp 12 is located below the left wire hook 3, and the wire tracks of the left wire hook 3, the electronic wire clamp 12 and the bushing wire hook 5 are collinear, that is, the stitch of the face line 19 between the left wire hook 3 and the bushing wire hook 5 is a straight line or an approximately straight line.

[0076] Specifically, the vertical distance between the electronic thread clipper 12 and the main shaft (not shown in the figure) is 60mm-65mm, preferably 63.60mm, that is, the installation position of the electronic thread clipper 12 is 9.5mm higher than the existing installation position.

[0077] A thread guide rod 13 is installed on the top of the machine head 1, the left thread hook 3, the needle bar thread hook 4 and the bushing thread hook 5 are located on the transverse left side of the thread guide rod 13, and the left thread hook 3, the needle bar thread hook 4 and the bushing thread hook 5 form the left thread path of the face thread 19; a small thread clipper 14, a large thread clipper 15, a fixed thread tensioner 16 and a right thread hook 17 are sequentially installed on the transverse right side of the thread guide rod 13 along the conveying direction of the face thread 19, and the small thread clipper 14, the large thread clipper 15, the fixed thread tensioner 16 and the right thread hook 17 form the right thread path of the face thread 19.

[0078] Specifically, as shown in Figures 1-9 A thread path capable of reducing the tension of the face thread, comprising a machine head 1 and a needle bar 2.

[0079] A left thread hook 3 is installed on the front side of the machine head 1, and the left thread hook 3 is a double-hook left thread hook, that is, an upper guide part 23 and a lower guide part 24 are arranged on the left thread hook 3.

[0080] The bottom end of the needle bar 2 is fixedly connected with a needle bar thread hook 4, and a threading hole 8 is arranged on the needle bar thread hook 4.

[0081] A bushing thread hook 5 is installed below the machine head 1, and the bushing thread hook 5 is a pressure rod lower bushing thread hook, one end of the pressure rod lower bushing thread hook is connected with a pressure rod 25, and the thread paths of the left thread hook 3, the bushing thread hook 5 and the needle bar thread hook 4 are collinear, that is, after the face thread 19 passes through the upper guide part 23, the bushing thread hook 5 and the threading hole 8 in sequence, the thread path between the left thread hook 3 and the bushing thread hook 5 is a straight line, thereby reducing the friction between the face thread 19 and the bushing thread hook 5, and further reducing the tension of the face thread 19.

[0082] Specifically, as shown in Figure 3 The left thread hook 3 is a double-hook left thread hook, and the left thread hook comprises a connecting plate 20, an upper bottom plate 21, a lower bottom plate 22, an upper guide part 23 and a lower guide part 24, one end of the connecting plate 20 is fixedly connected with the left end of the upper bottom plate 21, and the upper guide part 23 is fixedly arranged on the front side of the upper bottom plate 21; the top end of the lower bottom plate 22 is fixedly connected with the bottom end of the upper bottom plate 21, and the included angle between the upper bottom plate 21 and the lower bottom plate 22 is an obtuse angle, and the lower guide part 24 is fixedly arranged on the lower bottom plate 22.

[0083] The lower guide part 24 is located between the upper guide part 23 and the bushing thread hook 5, and the thread path passes through the lower guide part 24, that is, the lower guide part 24 is sleeved on the face thread between the upper guide part 23 and the bushing thread hook 5, and the lower guide part 24 does not contact the face thread.

[0084] The reason is that when the left thread hook is a single thread hook structure, the left thread hook cannot effectively prevent the shaking of the bobbin thread due to the excessively long thread path between the thread lifting lever 13 and the electronic thread clamp 12. In the embodiment, the left thread hook adopts a double thread hook structure, and the spacing between the upper guide part 23 and the machine head 1, the vertical spacing between the upper guide part 23 and the lower guide part 24, and the included angle between the upper bottom plate 21 and the lower bottom plate 22 are adjusted, so that the lower guide part 24 is sleeved outside the bobbin thread and does not contact the bobbin thread. Not only a straight thread path is realized, but also the friction between the bobbin thread 19 and the thread path is reduced, and the shaking of the bobbin thread 19 is effectively prevented through the horizontal limiting of the bobbin thread 19 by the upper guide part 23 and the lower guide part 24.

[0085] Embodiment, a sewing machine comprising the thread path capable of reducing the tension of the bobbin thread.

[0086] The working principle of the thread path of the utility model is as follows:

[0087] As shown in Figure 7 , the existing thread path is a bent thread path, and the thread path of the bobbin thread is relatively tortuous when threading. The bobbin thread has multiple contact points with the sewing machine when passing through the thread path, and the more the contact points, the greater the friction force received by the bobbin thread, and the greater the tension of the bobbin thread. As shown in Figure 2 , the thread path of the utility model is a straight thread path or a straight line type thread path. The contact points of the bobbin thread with the sewing machine are only the upper guide part of the left thread hook and the needle bar thread hook when the bobbin thread passes through the thread path, and the fewer the contact points, the smaller the friction force received by the bobbin thread, and the smaller the tension of the bobbin thread.

[0088] When sewing, it is assumed that the ideal thread tension range provided by the large thread clamp is 95gf-105gf, at which the sewing effect is best. It is assumed that the tension of the large thread clamp at this time is 100gf, but when the large thread clamp clamps the bobbin thread, the gap of the thread clamp plate changes due to the uneven thickness of the bobbin thread, and the clamping force also changes at this time. It is assumed that the change range of the large thread clamp at this time is ±15%, so that the tension provided by the large thread clamp will fluctuate between 85gf-115gf during sewing, and the amplitude is 30gf. The sewing effect is best within the tension range of 95gf-105gf, and there are sewing defects within the tension range of 85gf-95gf and 105gf-115gf, that is, there are 2 / 3≈0.666 of the tension range with sewing defects.

[0089] When the tension of the thread in the left thread channel is reduced by 10 gf, the ideal thread tension range provided by the large thread clamp changes from 95 gf-105 gf to 85 gf-95 gf, at this time, the large thread clamp is adjusted to 90 gf, the change range of the large thread clamp is ± 15%, the tension provided by the large thread clamp will fluctuate between 76.5 gf-103.5 gf, at this time, the tension range 76.5 gf-85 gf and 95 gf-103.5 gf has sewing defects, that is, there are 17 / 27 ≈ 0.629 of the tension range with sewing defects, and the farther away from the ideal range, the more obvious the sewing defects, when the large thread clamp is 100 gf, the maximum and minimum tension fluctuation is 10 gf away from the ideal point, and when the thread tension is reduced by 10 gf, the maximum and minimum tension fluctuation of the large thread clamp is 8.5 gf away from the ideal point, at this time, it can be determined that the probability of serious sewing defects of the original tension is greater than that after the thread tension is reduced.

[0090] When the thread tension in the left thread channel is reduced, the thread tension in the right thread channel can also be correspondingly reduced, at this time, the overall tension of the thread can also be correspondingly reduced, after reducing the tension of the thread in the thread channel, the sewing defects such as wrinkling, thread breakage and point throwing can be reduced.

[0091] The utility model reduces the frictional resistance of the left thread channel to the overall thread, reduces the clamping force required by the large thread clamp in the right thread channel, thereby reducing the risk of thread breakage and improving the sewing effect.

[0092] The above is only the preferred embodiment of the utility model, it should be pointed out that, for ordinary skilled person in the art, without departing from the technical principle of the utility model, a number of improvements and substitutions can be made, these improvements and substitutions should also be regarded as the protection scope of the utility model.

Claims

1. A thread path capable of reducing tension of a face thread, characterized by, The utility model provides a left line hook (3) is installed to one side of the head (1), and the bottom end of needle bar (2) is installed needle bar line hook (4), the lower side of head (1) is installed bushing line hook (5), and the wire channel of left line hook (3), bushing line hook (5) and needle bar line hook (4) is collinear.

2. The thread path capable of reducing tension of a face thread according to claim 1, wherein, The left line hook (3) includes an upper guide portion (23), and the wire channel of the upper guide portion (23), the bushing line hook (5), and the needle bar line hook (4) is collinear.

3. The thread path capable of reducing tension of a face thread according to claim 2, wherein, The left line hook (3) further includes a lower guide portion (24) fixedly connected with the upper guide portion (23), the lower guide portion (24) is located below the upper guide portion (23), and the wire channel passes through the lower guide portion (24).

4. The thread path capable of reducing tension of a face thread according to claim 1, wherein, The needle bar line hook (4) includes a connecting sleeve (6) and a threading hook (7), the threading hook (7) is located on one side of the connecting sleeve (6) and is fixedly connected with the connecting sleeve (6), and a threading hole (8) is formed on the threading hook (7).

5. The thread path capable of reducing the tension of the surface thread according to claim 4, wherein, The axis direction of the threading hole (8) is parallel to the axis direction of the needle bar (2).

6. The thread path capable of reducing tension of a face thread according to claim 1, wherein, The needle bar line hook (4) includes a connecting sleeve (6), an open slot (27) is formed at the bottom end of the connecting sleeve (6), the open slot (27) includes a slot body portion and an opening portion, the slot body portion extends along the circumferential direction of the connecting sleeve (6), the opening portion extends along the axial direction of the connecting sleeve (6), and the top end of the opening portion is fixedly connected with one end of the slot body portion.

7. The thread path capable of reducing tension of a face thread according to claim 1, wherein, The needle bar line hook (4) includes a connecting sleeve (6), a threading hole (8) is arranged at the bottom end of the connecting sleeve (6), and the threading hole (8) is arranged along the radial direction of the connecting sleeve (6).

8. The thread path capable of reducing tension of a face thread according to claim 1, wherein, The bushing line hook (5) is a needle bar lower bushing line hook or a pressure rod lower bushing line hook.

9. The thread path capable of reducing the tension of the surface thread according to claim 8, wherein, The needle bar lower bushing line hook includes a fixed portion (9), a U-shaped threading portion (10), and an operating portion (11), one leg of the U-shaped threading portion (10) is fixedly connected with the fixed portion (9), and the other leg of the U-shaped threading portion (10) is fixedly connected with the operating portion (11).

10. The thread path capable of reducing tension of a face thread according to claim 9, wherein, The U-shaped threading portion (10) is arranged along the radial direction of the fixed portion (9).

11. The thread path capable of reducing tension in a face thread according to claim 10, wherein, In the radial direction of the fixed portion (9), the length of the U-shaped threading portion (10) is 4.5mm-7mm, and the horizontal distance between the U-shaped threading portion (10) and the central axis of the fixed portion (9) is 12mm-14.5mm.

12. The thread path capable of reducing tension on the face thread of claim 8, wherein, The pressure rod lower bushing line hook includes a fixed portion (9), a U-shaped threading portion (10), an operating portion (11), and a connecting portion (26), one end of the connecting portion (26) is fixedly connected with the fixed portion (9), the other end of the connecting portion (26) is fixedly connected with one leg of the U-shaped threading portion (10), the other leg of the U-shaped threading portion (10) is fixedly connected with the operating portion (11), and the fixed portion (9) and the U-shaped threading portion (10) are located on the same side of the connecting portion (26).

13. The thread path capable of reducing tension in a face thread according to claim 12, wherein, The horizontal distance between the U-shaped threading portion (10) and the central axis of the fixed portion (9) is 29.3mm-33.8mm.

14. The thread path capable of reducing tension in a face thread according to claim 1, wherein, The electronic thread clipper (12) is installed on one side of the machine head (1), and is located below the left thread hook (3) with a vertical distance of 60-65mm from the main shaft.

15. The thread path capable of reducing tension in a face thread according to claim 1, wherein, The thread lifting rod (13) is installed on the top of the machine head (1), and the left thread hook (3), the needle rod thread hook (4) and the bushing thread hook (5) are located on one lateral side of the thread lifting rod (13), and the small thread clipper (14), the large thread clipper (15), the fixed thread buffer hook (16) and the right thread hook (17) are installed on the other lateral side of the thread lifting rod (13) in the conveying direction of the thread (19).

16. A sewing machine characterized by comprising: The sewing machine comprises the thread channel capable of reducing the thread tension according to any one of claims 1-15.

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