Yarn-quantity-variable take-up auxiliary device

Abstract

The utility model provides a variable thread quantity take-up auxiliary device, which relates to the technical field of clothing sewing, and comprises a driver, a transmission connecting rod, a slide block and a guide member, during working, the driver drives the slide block to do reciprocating translational motion along the guide member through the transmission connecting rod, the guide member is provided with a chute, and the slide block does linear displacement along the chute; the sliding block is provided with a movable thread passing hook, the movable thread passing hook can move horizontally along with the sliding block, the movable thread passing hook pulls a thread to move, the position of the thread is changed by changing the position of the movable thread passing hook, the position state of the thread is changed, and the thread supply amount is adjusted.

Description

TECHNICAL FIELD

[0001] The utility model relates to clothing sewing technical field, further relates to a variable thread amount thread picking auxiliary device. BACKGROUND

[0002] The technical problems (pain points) of the sewing machine after more than one hundred years of development and sediment mainly have three aspects: one, the cooperation problem of main mechanism when the sewing machine runs at high speed; two, the bobbin capacity problem of bottom thread; three, the variable thickness sewing problem.

[0003] The difference between the thread supply (collection) amount of the thread picking lever and the thread requirement of the shuttle causes the tightness or relaxation of the surface thread; the tightness of the surface thread causes the thread breakage rate of the sewing machine to increase; the relaxation of the surface thread causes the poor sewing quality. In fact, this situation not only exists in the looping machine, but also exists in other sewing machine equipment, such as the plain sewing machine, the overlock machine and the like.

[0004] The existing looping machine can only adjust the thread amount in the variable thickness sewing, and cannot automatically adjust the required sewing thread and the recovered excess thread amount in the sewing process.

[0005] For those skilled in the art, how to match the thread supply amount with the thread requirement is a technical problem to be solved at present. CONTENT OF THE UTILITY MODEL

[0006] The core of the utility model is to provide a variable thread amount thread picking auxiliary device, the slider is translated relative to the guide member, so that the position of the moving thread hook is adjusted, the adjustment of the thread supply amount is realized, and the specific scheme is as follows:

[0007] A variable thread amount thread picking auxiliary device, comprising a driver, a transmission connecting rod, a slider, and a guide member, the guide member is provided with a sliding groove for guiding the linear motion of the slider; the driver drives the slider to reciprocatingly translate along the guide member through the transmission connecting rod;

[0008] A moving thread hook is arranged on the slider, the moving thread hook can translate with the slider, and the moving thread hook is used for pulling the sewing thread to move and adjusting the thread supply amount.

[0009] Optionally, the driver is a motor, an electric cylinder or a pneumatic cylinder.

[0010] Optionally, the transmission connecting rod comprises a crank and a connecting rod, the output part of the driver is fixed to the first end of the crank, the second end of the crank is hinged to the first end of the connecting rod, and the second end of the connecting rod is hinged to the slider.

[0011] Optionally, a hinge column is arranged on the slider in a convex manner, and the second end of the connecting rod is provided with a hinge hole matched with the hinge column;

[0012] The first end of the connecting rod is hinged to the second end of the crank by a first pin screw.

[0013] Optionally, an assembly hole is arranged on the sliding block, and the moving thread hook is inserted into the assembly hole.

[0014] A threaded hole is arranged on the sliding block, and a screw is installed in the threaded hole to tightly fix the moving thread hook.

[0015] Optionally, the guide member comprises a top surface, a side surface and a bottom surface, and forms a sliding groove which is open in the side direction.

[0016] Optionally, a fixing lug is arranged on the lower part of the bottom surface, the fixing lug is provided with a fixing hole, and the fixing lug is fixedly assembled by a fixing screw.

[0017] Optionally, the included angle between the moving direction of the sliding block and the horizontal plane ranges from 0° to ±15°.

[0018] Optionally, the moving thread hook is a right thread hook.

[0019] Optionally, a sensor and a controller are further arranged on the pressing frame, the sensor is used for detecting the change of the thickness of the sewing material, and the controller is used for receiving the detection signal of the sensor and controlling the output of the driver.

[0020] Compared with the prior art, the variable thread amount thread picking auxiliary device is provided, and when working, the driver drives the sliding block to reciprocatingly and linearly move along the guide member through the transmission connecting rod, the guide member is provided with a sliding groove, and the sliding block linearly moves along the sliding groove; the sliding block is provided with the moving thread hook, the moving thread hook can move along with the sliding block, the moving thread hook pulls the sewing thread to move, the position state of the sewing thread is changed by changing the position of the moving thread hook, and the supply thread amount is adjusted. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0022] Figure 1 A schematic diagram of a lock stitch of a sewing machine is shown;

[0023] Figure 2 A function graph of the required thread amount is shown;

[0024] Figure 3 A schematic diagram of a thread picking mechanism is shown;

[0025] Figure 4 is a function graph of the thread amount;

[0026] Figure 5 is an explosion view of the variable thread amount thread picking auxiliary device;

[0027] Figure 6 is an axonometric view of the variable thread amount thread picking auxiliary device from a first perspective;

[0028] Figure 7 is an axonometric view of the variable thread amount thread picking auxiliary device from a second perspective;

[0029] Figure 8 is a front view of the variable thread amount thread picking auxiliary device;

[0030] Figure 9 is an axonometric view of the guide member;

[0031] Figure 10 is an axonometric view of the sliding block;

[0032] Figure 11 is an axonometric view of the connecting rod.

[0033] The figure includes:

[0034] driver 1, transmission connecting rod 2, crank 21, connecting rod 22, hinged hole 221, first pin shaft screw 23, second pin shaft screw 24, sliding block 3, hinged column 31, assembly hole 32, threaded hole 33, guide member 4, top surface 41, side surface 42, bottom surface 43, fixed lug plate 44, fixed hole 441, fixed screw 442, dynamic thread hook 5, thread hole 51, static thread hook 6. DETAILED DESCRIPTION

[0035] In order to make the technical personnel in the art better understand the technical scheme of the utility model, the variable thread amount thread picking auxiliary device of the utility model will be introduced and explained in detail below in combination with the drawings and specific embodiments.

[0036] In combination with Figure 5 the drawings, the variable thread amount thread picking auxiliary device provided by the utility model includes driver 1, transmission connecting rod 2, sliding block 3, guide member 4 and other structures, the guide member 4 is provided with a sliding groove for guiding the linear motion of the sliding block 3, the sliding groove and the sliding block 3 are matched to realize the guiding, the guide member 4 remains fixed and unmoved, and the sliding block 3 can translate relative to the guide member 4.

[0037] The driver 1 drives the sliding block 3 to reciprocatingly translate along the guide member 4 through the transmission connecting rod 2, the sliding block 3 makes linear motion relative to the guide member 4, the motion path of the sliding block 3 is along a straight line, and the motion direction is opposite in two directions.

[0038] A movable thread hook 5 is mounted on slider 3. The movable thread hook 5 is fixedly assembled to slider 3 and can move synchronously with slider 3. The movable thread hook 5 is used to pull the sewing thread to adjust the thread supply. Figure 5 As shown, the movable thread hook 5 is provided with a thread hole 51 through which the sewing thread can pass. When the movable thread hook 5 moves, it can pull the sewing thread. Combined with... Figure 6 , Figure 7 , Figure 8 As shown, a movable thread passer 5 and a stationary thread passer 6 are provided. The movable thread passer 5 is driven to move horizontally by the slider 3, while the stationary thread passer 6 remains fixed. When using the sewing thread, it needs to pass through the movable thread passer 5 and the stationary thread passer 6 respectively. When the movable thread passer 5 and the stationary thread passer 6 remain relatively stationary, the amount of thread supplied is the same as the amount of thread required. When the movable thread passer 5 moves horizontally relative to the stationary thread passer 6, the distance between the movable thread passer 5 and the stationary thread passer 6 changes, and the amount of thread supplied is different from the amount of thread required.

[0039] Regarding the amount of thread required Introduction:

[0040] Thread requirement refers to the total amount of thread required by each component of a sewing machine during its operation.

[0041] Combination Figure 1 As shown, the amount of thread required at each instant during stitch formation depends not only on the stitch spacing and fabric thickness, but also on the structure of the stitch-feeding mechanism and the shape of the shuttle in the hook-and-loop mechanism. The amount of thread required at different instants during the rotation of the upper shaft is illustrated. They are different, like this. Then with the upper axis rotation angle Forming functional relationships Considering that the upper axis forms a trace with each revolution, i.e., the function... Therefore It undergoes cyclical changes with a minimum positive period.

[0042] Combination Figure 2 As shown, in order to quantitatively analyze the amount of thread required in a stitching process... The function can be View it as a piecewise function: ;

[0043] in:

[0044] —The amount of thread required during feeding (negligible);

[0045] —The amount of thread required for the needle bar to move varies with the thickness of the fabric (positively correlated);

[0046] —The amount of thread required during the needle loop passing through the shuttle is unrelated to the thickness of the fabric.

[0047] Regarding cable supply Introduction:

[0048] The thread supply refers to the amount of thread provided by the thread take-up mechanism during the operation of the sewing machine (including take-up and let-out).

[0049] Combination Figure 3 The diagram shown illustrates the thread feed mechanism. In traditional sewing machines, the positions of the left and right thread hooks cannot be automatically adjusted, resulting in a relatively constant amount of thread for each stitch, both the feed and take-up. Even minor variations can only be achieved by adjusting the thread feed mechanism before starting the sewing; automatic thread control is not possible. In other words, the thread feed amount of a traditional sewing machine's thread feed mechanism is limited. It will not change with the thickness of the seam material.

[0050] Combination Figure 4 As shown, the number of cables supplied It can also be viewed as the principal axis rotation angle. The function, let .

[0051] Formula for calculating the amount of wire supplied:

[0052]

[0053] In the formula:

[0054] —The maximum amount of thread held in one operating cycle of the thread take-up mechanism; for traditional sewing machines, this value is fixed.

[0055] —The thread-picking mechanism The amount of thread held at an angle (spindle rotation angle); for traditional sewing machines, this value only changes with the spindle rotation angle. It changes with the change, but does not change with the change of the fabric thickness.

[0056] Combining the above "line supply volume" "The calculation formula is explained for traditional sewing machines:" The size will not change with the thickness of the fabric.

[0057] Cable supply and required line quantity Introduction to the relationship between them:

[0058] In one sewing cycle (top spindle corner) There are three requirements for the yarn supply status: maintaining a slack yarn, i.e., sufficient yarn supply; ensuring yarn supply while requiring taut yarn; and requiring "supply shortage," supplementing the yarn supply with spools of yarn. Which state the yarn supply is in at any given moment depends entirely on the amount of yarn supplied. and required line quantity The relationship between them is as follows:

[0059]

[0060] In the formula:

[0061] —— and The composite function formed by them It is the spindle angle function; Indicates in Cable supply status at the specified angle (spindle rotation angle);

[0062] —Maximum wire storage capacity of the take-up spring (which is a constant).

[0063] When the fabric thickness is different, the amount of thread required during the needle loop passing through the shuttle ( The amounts of line supplied by the line-lifting lever are equal. However, the actual amount of thread supplied should be calculated by deducting twice the thickness of the fabric used for sewing. Therefore, measures must be taken to address changes in sewing thickness (both the amount of thread supplied and the timing of thread take-up and take-down need to be adjusted), otherwise sewing problems such as "skipped stitches" and "stitches" are likely to occur.

[0064] To address the aforementioned technical pain points (variable thickness sewing), this utility model provides a device that assists the thread take-up mechanism in automatically adjusting the required amount of thread and recovering excess thread, "thread supply..." "It can change according to the thickness of the sewing material. By using the translation of the slider 3, the moving thread hook 5 can make a linear translation movement. The relative distance between the moving thread hook 5 and the stationary thread hook 6 can be adjusted according to the thickness of the sewing material to match the amount of thread supplied with the amount of thread required. This can effectively avoid sewing defects such as "skipped stitches" and "stitching".

[0065] Based on the above solution, the driver 1 of this utility model is a motor, an electric cylinder, or a pneumatic cylinder. Figure 5 , Figure 6 , Figure 7 In the structure shown, the driver 1 is a motor. The output shaft of the motor drives the transmission link 2 to rotate, and through the transmission link 2, the rotation output by the motor is converted into the translation of the slider 3. The slider 3 then drives the moving hook 6 to translate. It should be noted that the moving distance of the slider 3 is related to the rotation angle of the motor output shaft; the larger the rotation angle, the greater the range of motion of the slider 3.

[0066] It should be noted that the driver 1 can also directly output a translational motion and drive the slider 3 to translate through the transmission connecting rod 2, and these specific embodiments shall also be included in the protection scope of the utility model.

[0067] In combination with Figure 5 , Figure 6 shown in the drawings, the transmission connecting rod 2 of the utility model comprises a crank 21 and a connecting rod 22, and the crank 21 and the connecting rod 22 are two rigid rod structures; the output part of the driver 1 is fixed to the first end of the crank 21, and the output part of the driver 1 can drive the crank 21 to rotate. The second end of the crank 21 is hinged to the first end of the connecting rod 22, a hinged cooperation is formed between the crank 21 and the connecting rod 22, and the two can rotate relative to each other; the second end of the connecting rod 22 is hinged to the slider 3, and the connecting rod 22 and the slider 3 can realize relative rotation. When the output of the driver 1 rotates, the crank 21 is driven to rotate forward or reversely synchronously, and the crank 21 performs a circular motion; the first end of the connecting rod 22 performs a circular motion along with the crank 21, the second end of the connecting rod 22 performs a translational motion along with the slider 3, and the connecting rod 22 performs a spatial plane motion. Through the transmission cooperation of the crank 21 and the connecting rod 22, the slider 3 realizes a linear translational motion.

[0068] In combination with Figure 10 shown in the drawings, the slider 3 of the utility model is provided with a hinged column 31 outward protruding, the hinged column 31 is a cylinder protruding from the outer surface of the slider 3; the second end of the connecting rod 22 is provided with a hinged hole 221 matched with the hinged column 31, and the second end of the connecting rod 22 is connected with the hinged column 31 through a second pin screw 24. A threaded hole for screwing in the second pin screw 24 is arranged on the end face of the hinged column 31, and the second pin screw 24 presses the connecting rod 22 on the slider 3, so that the connecting rod 22 and the hinged column 31 form a hinged cooperation, and the hinged column 31 serves as a hinge shaft between the connecting rod 22 and the slider 3.

[0069] The first end of the connecting rod 22 is hinged with the second end of the crank 21 through a first pin screw 23, the cylindrical part of the first pin screw 23 passes through the connecting rod 22 and the crank 21, and the first pin screw 23 serves as a hinge shaft of the connecting rod 22 and the crank 21. The first pin screw 23 can adopt a riveting assembly form or can be matched with a nut, and these shall be included in the protection scope of the utility model.

[0070] In combination with Figure 10 shown in the drawings, an assembly hole 32 is arranged on the slider 3, the assembly hole 32 can be a through hole or a blind hole, the inner cavity section shape of the assembly hole 32 is matched with the shape of the wire hook 5, and the wire hook 5 is inserted and assembled in the assembly hole 32.

[0071] A threaded hole 33 is arranged on the slider 3, the threaded hole 33 is perpendicular to the assembly hole 32, and the end of the threaded hole 33 extends to the assembly hole 32. The threaded hole 33 is used for mounting a screw, when the screw is tightened, the end of the screw can be tightly pressed to the outer surface of the thread hook 5, so as to fix the movable thread hook 5. When it is necessary to remove and replace the thread hook 5, the screw is loosened first. The thread hook 5 is detachably mounted, and the thread hook 5 can be replaced according to different sewing equipment, and has better universality.

[0072] In combination Figure 9 As shown in the figure, the guide member 4 of the utility model includes a top surface 41, a side surface 42 and a bottom surface 43, the top surface 41, the side surface 42 and the bottom surface 43 form a chute with a cross section in the shape of a "concave" character, the side of the chute is open, only one side surface, and three surfaces are solid structures, and the slider 3 is arranged through the side without a side surface. In this structure, the connecting rod 22 and the crank 21 move in the vertical plane, if the connecting rod 22 and the crank 21 move in the horizontal plane, the guide member 4 of the utility model can be turned over by 90°, so that there is no solid surface above, and the same transmission effect can be achieved. Figure 9 As shown in the figure, the guide member 4 of the utility model includes a top surface 41, a side surface 42 and a bottom surface 43, the top surface 41, the side surface 42 and the bottom surface 43 form a chute with a cross section in the shape of a "concave" character, the side of the chute is open, only one side surface, and three surfaces are solid structures, and the slider 3 is arranged through the side without a side surface. In this structure, the connecting rod 22 and the crank 21 move in the vertical plane, if the connecting rod 22 and the crank 21 move in the horizontal plane, the guide member 4 of the utility model can be turned over by 90°, so that there is no solid surface above, and the same transmission effect can be achieved.

[0073] The lower part of the bottom surface 43 is provided with a fixed lug plate 44 protruding downward, and the thickness of the fixed lug plate 44 is less than the width of the bottom surface 43. The fixed lug plate 44 is provided with a fixed hole 441, and is fixedly assembled through a fixed screw 442, in combination Figure 6 、 Figure 9 As shown in the figure, the fixed lug plate 44 is provided with two fixed holes 441, and one fixed screw 442 is assembled in each fixed hole 441, the guide member 4 is fixedly assembled through the fixed screw 442, and the guide member 4 remains fixed during use.

[0074] Specifically, in a specific embodiment of the utility model, the included angle between the moving direction of the slider 3 and the horizontal plane is in the range of 0°±15°, in combination Figure 7 As shown in the figure, in this embodiment, the moving direction of the slider 3 is arranged along the horizontal plane, and the included angle between the moving direction of the slider 3 and the horizontal plane is 0°.

[0075] In combination Figure 7 As shown in the figure, the movable thread hook 5 in the utility model is a right thread hook, and the left thread hook remains fixed. If necessary, the left thread hook can also be driven to move horizontally, and the right thread hook remains fixed.

[0076] The variable thread amount thread guiding auxiliary device further includes a sensor and a controller mounted on the pressing frame. The material to be sewn is pressed by the pressing frame before being sewn by the thread. The sensor mounted on the pressing frame is used to detect the thickness change of the material to be sewn. The controller is used to receive the detection signal of the sensor and control the output of the driver 1, so as to change the rotation angle of the motor according to the thickness of the material to be sewn, thereby changing the thread supply amount.

[0077] The logic principle of the utility model is as follows:

[0078] a, install the sensor on the pressing frame, which is used for detecting the change of the seam thickness (the sensor is not shown in the figure). Replace the change amount with . When the seam thickness (i.e. changes), the sensor will transmit the signal to the motor after a series of processing by the controller, and then the motor will respond to the signal: rotate a certain angle . From the mathematical point of view, and exist the following functional relationship:

[0079] Combined with Figure 7 , the right thread hook (moving thread hook 5) is fixed on the sliding block 3, and when the motor rotates, the sliding block drives the right thread hook to move left and right.

[0080] b, the calculation formula of the thread supply amount of the utility model becomes the following form:

[0081]

[0082] In the formula:

[0083] The maximum thread storage amount in one operating cycle of the thread tensioning mechanism; for the device of the utility model, since can change with the change of the seam thickness, the maximum thread storage amount will also change with the change of the seam thickness;

[0084] The thread storage amount of the thread tensioning mechanism at angle (main shaft rotation angle); for the device of the utility model, since can change with the change of the seam thickness, the thread storage amount of the thread tensioning mechanism at angle (main shaft rotation angle) will also change with the change of the seam thickness.

[0085] Since the right thread hook changes in real time, and do not exist a functional relationship. In other words, and are independent relationships.

[0086] When the seam thickness changes, the required sewing thread and the recovered excess thread amount can be automatically adjusted; combined with "thread supply amount The calculation formula of the transmission device is simplified greatly by changing the horizontal position of the overline hook according to the local conditions; the transmission device is simple in structure, reliable, and convenient to replace the functional components to adapt to different working conditions.

[0087] The most important support of the present application is to accurately calculate the thread consumption (machine needle mechanism + shuttle mechanism) and thread supply (thread picking mechanism) of the knot tying machine. The logic of the algorithm is entirely supported by the mathematical model provided by Comrade Zhu Qianhui.

[0088] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A variable thread tensioner comprising: It comprises a driver (1), a transmission connecting rod (2), a slider (3), and a guide member (4) provided for guiding the slider (3) to move linearly; the driver (1) drives the slider (3) to move reciprocatingly along the guide member (4) through the transmission connecting rod (2). A moving thread hook (5) is mounted on the slider (3) and can move with the slider (3); the moving thread hook (5) is used for pulling the suture to move and adjusting the amount of thread.

2. The variable thread take-up assist device of claim 1 wherein, The driver (1) is an electric motor, an electric cylinder or a pneumatic cylinder.

3. The variable thread take-up assist device of claim 1 wherein, The transmission connecting rod (2) comprises a crank (21) and a connecting rod (22); the output of the driver (1) is fixed to the first end of the crank (21); the second end of the crank (21) is hinged to the first end of the connecting rod (22); and the second end of the connecting rod (22) is hinged to the slider (3).

4. The variable thread take-up assist device of claim 3 wherein, An articulated column (31) is provided on the slider (3) and protrudes outward; the second end of the connecting rod (22) is provided with an articulated hole (221) matched with the articulated column (31). The first end of the connecting rod (22) and the second end of the crank (21) are hinged through a first pin screw (23).

5. The variable thread take-up assist device of claim 1 wherein, An assembly hole (32) is provided on the slider (3); the moving thread hook (5) is inserted and assembled in the assembly hole (32). A threaded hole (33) is provided on the slider (3); the threaded hole (33) is used for mounting a screw and tightly fixing the moving thread hook (5).

6. The variable thread take-up assist device of claim 1 wherein, The guide member (4) comprises a top surface (41), a side surface (42) and a bottom surface (43), forming a slide groove open in the side direction.

7. The variable thread take-up assist device of claim 6 wherein, A fixed lug plate (44) is provided on the lower part of the bottom surface (43); the fixed lug plate (44) is provided with a fixed hole (441) and is fixed and assembled through a fixed screw (442).

8. The variable thread take-up assist device of claim 1 wherein, The included angle between the moving direction of the slider (3) and the horizontal plane is in the range of 0°±15°.

9. The variable thread take-up assist device of any one of claims 1 to 8, wherein, The moving thread hook (5) is a right thread hook.

10. The variable thread take-up assist device of any one of claims 1 to 8, wherein, A sensor and a controller mounted on the pressing frame are further included; the sensor is used for detecting the change of the thickness of the sewing material; the controller is used for receiving the detection signal of the sensor and controlling the output of the driver (1).

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