Sewing machine and needle and thread guiding-out device thereof

Abstract

The utility model provides a sewing machine needle and thread leading-out device which is arranged on a sewing machine, the sewing machine is provided with a thread adjusting device and a material pricking mechanism, and the needle and thread leading-out device comprises a fixed needle and thread channel, a needle and thread leading-out piece, a variable needle and thread channel, a movable needle and thread take-up component and a needle and thread guiding component which are sequentially arranged between the thread adjusting device and the material pricking mechanism. The utility model further provides a sewing machine which comprises the needle and thread guiding-out device. The utility model has the beneficial effects that through the cooperation of the movable needle and thread take-up component, the variable needle and thread channel and the needle and thread guide part, a sewing thread can have a proper tightening degree when a common fabric is sewn; the appropriate thread supply amount can be guaranteed when the fabric with the large elasticity is sewn, the sewing thread has the appropriate tightening degree, and in other words, the device can provide the tight thread supply mode and the soft thread supply mode. The supporting part of the needle and thread adjusting piece is arranged to be the inclined surface, so that the time and the shape of generating a needle and thread ring below the fabric are more reasonable, and the quality problems of needle skipping and the like are effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a sewing machine and a needle and thread guide device thereof. Background Art

[0002] Conventional sewing machines feature a movable thread guide that swings back and forth. This reciprocating motion controls the flow of thread from a thread regulator through a fixed thread path. However, the thread feed required varies depending on the fabric, and the three thread feed holes corresponding to the three threads controlled by the movable thread guide are fixed. This makes it impossible to adjust the lengths of the three threads to suit the sewing conditions of different fabrics, nor is it possible to adjust the thread feed amount.

[0003] To maintain a good thread supply, existing sewing machines are equipped with a variable mechanism for adjusting the reciprocating motion of the movable thread guide member or for adjusting the vertical position of the thread hole in the thread path. Depending on factors such as the thickness of the fabric being sewn, this variable mechanism adjusts the stroke or the vertical position of the thread hole to increase or decrease the length of the thread supply path, thereby controlling the thread supply. This variable mechanism allows for the production of quality sewn products with proper tension and no loosening of the thread, even when sewing standard fabrics with a relatively stiff texture and low elasticity.

[0004] However, when sewing very soft and elastic fabrics that have become more versatile in recent years (such as stretch yarns and fabrics with a relatively high yarn content), if the above-mentioned needle and thread feeding device is used as usual, the fabric part at the sewing location will be tightened, and a half-moon bulge will appear on the fabric part, thereby reducing the sewing quality. Utility Model Content

[0005] The purpose of the utility model is to provide a sewing machine needle and thread guide device to solve the problems existing in the prior art.

[0006] The utility model provides a sewing machine needle and thread guide device, which is arranged on the sewing machine, and the sewing machine is provided with a thread adjuster for adjusting the needle and thread tension and a material-piercing mechanism that can reciprocate in the up and down directions. The needle and thread guide device comprises a fixed needle and thread channel, a needle and thread guide piece, a variable needle and thread channel, a movable needle and thread take-up component and a needle and thread guide component that are sequentially arranged between the thread adjuster and the material-piercing mechanism. The position of the fixed needle and thread channel is fixed for the needle and thread guided from the thread adjuster to pass through; the position of the needle and thread guide piece can be adjusted in the up and down directions, and a guide hole is provided on the needle and thread channel; the position of the variable needle and thread channel can be adjusted in the up and down directions for the needle and thread guided from the fixed needle and thread channel or the needle and thread guide piece to pass through; the movable needle and thread take-up component acts in conjunction with the material-piercing mechanism The structure is structured to perform synchronous up and down reciprocating swinging motion, and is respectively provided with a first needle and thread lead-out hole, a needle and thread guide part and a second needle and thread lead-out hole; the needle and thread guide part is provided with a third needle and thread lead-out hole, and the third needle and thread lead-out hole is located between the first needle and thread lead-out hole and below the first needle and thread lead-out hole and the second needle and thread lead-out hole; the needle and thread guide component is provided with a needle and thread hole, and is connected to a needle and thread adjusting part, and the top of the needle and thread adjusting part is provided with a supporting part for supporting the needle and thread, and the supporting part is a slope, and its upper and lower positions are adjustable; when the movable needle and thread picking component swings downward, the supporting part abuts against the needle and thread part located between the first needle and thread lead-out hole and the third needle and thread lead-out hole and causes the needle and thread part to bend upward.

[0007] Preferably, the needle and thread adjusting member is provided with an adjusting slot extending in the up-down direction, and the adjusting slot is connected to the needle and thread guide component by a screw.

[0008] Preferably, the top of the needle and thread adjusting member is provided with a plurality of long grooves extending in the up-down direction, and the supporting member having the supporting portion is connected to the long grooves by screws.

[0009] Preferably, the arrangement position of the needle and thread guide portion on the movable needle and thread take-up member can be adjusted in the up and down directions.

[0010] Preferably, the fixed needle and thread channel, the needle and thread guide member and the variable needle and thread channel are all mounted on the sewing machine via a fixed mounting plate.

[0011] Preferably, when sewing fabrics with less elasticity, the needle and thread are sequentially passed through the fixed needle and thread channel, the needle and thread guide, the variable needle and thread channel, the second needle and thread guide hole, the first needle and thread guide hole and the needle and thread guide component by the thread adjuster; when sewing fabrics with greater elasticity, the needle and thread are sequentially passed through the fixed needle and thread channel, the variable needle and thread channel, the second needle and thread guide hole, the third needle and thread guide hole, the first needle and thread guide hole and the needle and thread guide component by the thread adjuster.

[0012] The utility model also provides a sewing machine, comprising the aforementioned needle and thread guiding device.

[0013] The benefits of this utility model lie in the fact that, through the coordination of the movable thread take-up member, the variable thread channel, and the thread guide, it is possible to achieve an appropriate degree of thread tightening when sewing general fabrics; it is also possible to ensure an appropriate thread supply and achieve an appropriate degree of thread tightening when sewing fabrics with high elasticity, that is, the device can provide both tight and gentle thread supply modes. The inclined support portion of the thread adjusting member can more reasonably generate the needle thread loop at the bottom of the fabric and its shape, effectively reducing quality problems such as skipped stitches. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the front view of the sewing machine of the utility model;

[0015] Figure 2 This is a schematic diagram of the threading of the needle and thread guide device when sewing general fabrics;

[0016] Figure 3 This is a schematic diagram of the threading of the needle and thread guide device when sewing elastic fabrics;

[0017] Figure 4 This is a schematic diagram of the first structure of the needle and thread adjusting piece;

[0018] Figure 5 This is a second structural diagram of the needle and thread adjusting component.

[0019] Component number description:

[0020] 1 Sewing machine arm

[0021] 2 Sewing machine body

[0022] 3 needles

[0023] 4 Needle thread guide

[0024] 4A needle and thread hole

[0025] 5 Needle and thread adjusting parts

[0026] 51 Adjustment slot

[0027] 52 screws

[0028] 53 Long Groove

[0029] 54 screws

[0030] 55 Support

[0031] 5a Supporting part

[0032] 6 Movable needle and thread take-up member

[0033] 61 needle and thread guide

[0034] 6A First needle thread lead-out hole

[0035] 6B Second needle thread lead-out hole

[0036] 6C Third needle thread lead-out hole

[0037] 7 thread take-up shaft

[0038] 8 Fixed mounting plate

[0039] 81 Long hole

[0040] 82 screws

[0041] 9 variable needle and thread channels

[0042] 10 Needle and thread guide

[0043] 11 Needle and thread lubrication mechanism

[0044] 111 Fixed needle and thread channel

[0045] 12 Needlework

[0046] 12a / 12b needle and thread part

[0047] 13. Material piercing mechanism

[0048] 14 Wire Adjuster DETAILED DESCRIPTION

[0049] The following is a further detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, and are not intended to limit the present invention.

[0050] In the description of this utility model, it should be noted that the terms "upper," "lower," "front," "back," "left," "right," "top," and "bottom" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0052] Figure 1 The front view of the sewing machine of the present invention is shown. In the following description, Figure 1 The attached drawings in the figure serve as a reference for the direction. Figure 1 In the figure, the front direction is perpendicular to the viewing paper and facing outward, the back direction is perpendicular to the viewing paper and facing inward, the upward direction is along the viewing paper, the downward direction is along the viewing paper, the right direction is along the viewing paper, and the left direction is along the viewing paper.

[0053] like Figure 1 As shown, the sewing machine includes a sewing machine body 2 and a sewing machine arm 1 mounted on the sewing machine body 2. A well-known crank mechanism and a drive spindle (not shown) are provided at the left end of the sewing machine arm 1. A piercing mechanism 13 that can reciprocate in the up and down directions is provided. A presser foot mechanism (not described in detail because it is well known) is adjacent to the piercing mechanism 13 and acts on the fabric during sewing. Three needles 3 are mounted at the lower end of the piercing mechanism 13. A needle plate and a feed mechanism (not described in detail because it is well known) are provided at the left end of the sewing machine body 2. Three thread adjusters 14 are provided on the right side of the sewing machine arm 1. Each thread adjuster 14 can impart frictional resistance to a needle and thread 12, thereby adjusting the needle and thread tension.

[0054] Combine Figure 1-3 As can be seen, the needle and thread guide device provided by the present invention is installed on the sewing machine arm 1, and includes a fixed needle and thread channel 111, a needle and thread guide member 10, a variable needle and thread channel 9, a movable needle and thread take-up member 6, and a needle and thread guide member 4, which are sequentially arranged between the thread regulator 14 and the material piercing mechanism 13. The fixed needle and thread channel 111, the needle and thread guide member 10, and the variable needle and thread channel 9 are all installed on the sewing machine arm 1 via a fixed mounting plate 8, and the needle and thread oiling mechanism 11 is also fixed to the fixed mounting plate 8.

[0055] The three needle threads 12 guided from the three thread regulators 14 pass through the needle and thread oiling mechanism 11 in a collective state, complete the coating of the lubricating oil on themselves, and then pass through the fixed needle and thread channel 111.

[0056] The thread guide 10 has a vertically extending slot, which is screwed to the fixed mounting plate 8. Its vertical position on the fixed mounting plate 8 is adjustable. The thread guide 10 also has a guide hole for the thread 12. The thread guide 10 is located between and below the fixed thread channel 111 and the variable thread channel 9. Lowering the height of the thread guide 10 increases the amount of thread 12 that can be guided.

[0057] Three long holes 81 extending in the up and down directions are provided on the fixed mounting plate 8. Each long hole 81 is connected to a channel mounting frame of a variable needle and thread channel 9 by a screw 82. Therefore, the upper and lower positions of the variable needle and thread channel 9 on the fixed mounting plate 8 can be adjusted, and it can be used for the needle and thread 12 derived from the fixed needle and thread channel 111 or the needle and thread detent 10 to pass through.

[0058] Driven by the aforementioned drive spindle, the thread take-up shaft 7 rotates clockwise or counterclockwise, and the movable thread take-up member 6, with the thread take-up shaft 7 as its swinging fulcrum, performs an up-and-down reciprocating swinging motion synchronized with the piercing mechanism 13. The movable thread take-up member 6 is provided with a first thread outlet 6A, a thread guide 61, and a second thread outlet 6B. The thread guide 61 is provided with a third thread outlet 6C, which is located between and below the first and second thread outlets 6A and 6B. The third thread outlet 6C allows the thread portion (12a and 12b) between the first and second thread outlets 6A and 6B to bend downward into a V-shape. The first thread outlet 6A is located on the thread take-up member 6, near the left end of the thread guide member 4, and the second thread outlet 6B is located on the right end of the thread take-up member 6, near the variable thread channel 9. The needle thread guide portion 61 is integrally formed or provided on the movable needle thread take-up member 6 in a manner that it can be adjusted up and down.

[0059] The thread guide member 4 is provided with a thread hole 4A and is connected to a thread adjusting member 5. The thread adjusting member 5 is located midway along the thread supply path between the first thread outlet hole 6A and the thread hole 4A. Three inclined support portions 5a are located on the top of the thread adjusting member 5, supporting the thread 12. These support portions 5a are adjustable in their vertical position. Only when the movable thread take-up member 6 swings downward do the support portions 5a contact the three thread portions 12a located between the first and third thread outlet holes 6A and 6C, causing them to bend upward.

[0060] The needle and thread adjusting member 5 has a variety of structural forms. The first structural form is as follows Figure 4As shown, of the three top supports 5a, the right support 5a is the tallest, as it is the first to enter the thread loop during looping. The middle support 5a is the next tallest, and the left support 5a, which enters the thread loop last during looping, is the smallest. This arrangement ensures that the three threads 12 have approximately equal slack when the movable thread take-up member 6 swings downward, preventing the formation of a semi-conical bulge at the sewing area of ​​the fabric. The inclined support 5a facilitates automatic adjustment of the thread portion 12a when the thread tension is high, thereby adjusting the timing of the thread loop formation beneath the fabric. The thread adjustment member 5 also includes an adjustment slot 51 extending vertically. The adjustment slot 51 is connected to the thread guide member 4 via a screw 52. By changing the position of the screw 52 within the adjustment slot 51, the height of the three supports 5a relative to the thread guide member 4 or the first thread outlet 6A can be simultaneously adjusted.

[0061] The second structural form of the needle and thread adjusting member 5 is as follows Figure 5 As shown, three vertically extending, parallel slots 53 are provided on the top. A support member 55 having support portions 5a is connected to the slots 53 via screws 54. Those skilled in the art can modify the height of each support portion 5a as needed. Compared to the first structural form, the second structural form offers greater flexibility.

[0062] Combine Figure 2 As can be seen, when sewing general fabrics, which generally have low elasticity, the vertical positions of the thread guide 10 and the variable thread channel 9 can be pre-adjusted based on factors such as the thickness of the fabric being sewn and the thickness and elasticity of the needle and thread 12. The length of the thread supply path can be adjusted according to the appropriate supply of the three needle threads 12, and the frictional resistance generated by the thread adjuster 14 can be adjusted to ensure that the thread 12 maintains appropriate thread tension. The adjusted thread threading sequence of the three needle threads 12 is: fixed thread channel 111 - thread guide 10 - variable thread channel 9 - second thread outlet 6B - first thread outlet 6A - thread guide member 4, and then lowered to guide the three needles 3.

[0063] like Figure 3As shown, when sewing very soft and elastic fabrics (such as those with a high content of stretch yarn or yarn), the adjusted threading sequence of the three threads 12 is: fixed thread channel 111 - variable thread channel 9 - second thread lead-out hole 6B - third thread lead-out hole 6C - first thread lead-out hole 6A - thread guide member 4, and then descending to guide the three needles 3. Because the third thread lead-out hole 6C creates a V-shaped portion of the thread passing through the movable thread lead-out member 6, the overall length of the thread portion is increased. This ensures that the frictional resistance imparted by the thread adjuster 14 to the thread 12 is maintained at an appropriate value to prevent uneven sewing. At the same time, as the movable needle and thread picking member 6 swings downward, (1) the distance L from the variable needle and thread channel 9 to the first needle and thread outlet hole 6A gradually increases, and the needle and thread outlet amount gradually increases; (2) the needle and thread portion 12b located between the second needle and thread outlet hole 6B and the third needle and thread outlet hole 6C swings downward, so that the needle and thread outlet force f used to resist the outlet friction resistance given by the thread adjuster 14 gradually becomes stronger; (3) the needle and thread portion 12a between the third needle and thread outlet hole 6C and the first needle and thread outlet hole 6A is supported by the supporting portion 5a of the needle and thread adjusting member 5 and bent upward, so that the needle and thread outlet force f used to resist the outlet friction resistance generated by the thread adjuster 14 is further enhanced, thereby achieving the purpose of not being restricted by the thickness of the sewing fabric and being able to sew according to regulations.

[0064] Therefore, when sewing fabrics with very soft texture and high elasticity, the needle and thread part when the needle 3 penetrates the fabric and reaches the lower dead point and the needle and thread part when the needle 3 rises from the lower dead point to the upper dead point can maintain a small amount of slack without being strongly tightened, so that the stitches wrapped on the hooks of the needle plate when returning the cloth can be smoothly pulled out from the hooks, and can maintain a small amount of slack without being strongly tightened. When the needle and thread penetrate the fabric from above, the needle and thread press downward into the fabric part at the penetration point, and the looped thread wrapped around the needle and thread pulls down the needle-penetrated part of the fabric, so it will not be overly tightened, thereby avoiding quality problems such as half-moon-shaped drop (arching) at the sewing point of the fabric.

[0065] The utility model also provides a sewing machine, which includes the aforementioned needle and thread leading-out device.

[0066] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A sewing machine thread guide device, provided on the sewing machine, wherein the sewing machine is provided with a thread regulator for adjusting the needle and thread tension and a material-piercing mechanism capable of reciprocating in the vertical direction, characterized in that: The needle and thread guide device includes a fixed needle and thread channel, a needle and thread guide member, a variable needle and thread channel, a movable needle and thread take-up member and a needle and thread guide member, which are sequentially arranged between the thread adjuster and the material piercing mechanism. The position of the fixed needle and thread channel is fixed, and the needle and thread guided from the thread adjuster passes through; The position of the needle and thread guide member can be adjusted in the up and down directions, and a guide hole is provided on the needle and thread guide member; The position of the variable needle and thread channel can be adjusted in the up and down directions to allow the needle and thread guided from the fixed needle and thread channel or the needle and thread guiding member to pass through; The movable thread take-up member performs an up and down reciprocating swinging motion synchronously with the material-piercing mechanism, and is respectively provided with a first thread outlet hole, a thread guide portion, and a second thread outlet hole; the thread guide portion is provided with a third thread outlet hole, and the third thread outlet hole is located between the first thread outlet hole and the second thread outlet hole, and is located below the first thread outlet hole and the second thread outlet hole; The needle and thread guide member is provided with a needle and thread hole and is connected to a needle and thread adjusting member. The top of the needle and thread adjusting member is provided with a supporting portion for supporting the needle and thread. The supporting portion is an inclined surface and its vertical position is adjustable. When the movable needle and thread take-up member swings downward, the supporting portion abuts against the needle and thread portion located between the first needle and thread lead-out hole and causes the needle and thread portion to bend upward. The top of the needle and thread adjusting member is provided with a plurality of long grooves extending in the up-down direction, and the supporting member having the supporting portion is connected to the long grooves by screws.

2. The needle thread guide device according to claim 1, characterized in that: The setting position of the needle thread guide portion on the movable needle thread take-up member can be adjusted along the up and down direction.

3. The needle thread guide device according to claim 1, characterized in that: The fixed needle and thread channel, the needle and thread guide element and the variable needle and thread channel are all mounted on the sewing machine via a fixed mounting plate.

4. The needle thread guide device according to claim 1, characterized in that: When sewing fabrics with low elasticity, the needle and thread are sequentially passed through the fixed needle and thread channel, the needle and thread guide member, the variable needle and thread channel, the second needle and thread guide hole, the first needle and thread guide hole and the needle and thread guide member by the thread adjuster; When sewing fabrics with greater elasticity, the needle and thread are sequentially passed through the fixed needle and thread channel, the variable needle and thread channel, the second needle and thread lead-out hole, the third needle and thread lead-out hole, the first needle and thread lead-out hole and the needle and thread guide component by the thread adjuster.

5. A sewing machine, characterized in that: It comprises the needle and thread guide device according to any one of claims 1 to 4.

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