Horizontal rotating shuttle sewing machine

Abstract

The utility model provides a horizontal rotating shuttle sewing machine, and belongs to the technical field of sewing machines. The problem that in the prior art, a computer sewing machine is poor in sewing reliability is solved. The horizontal rotating shuttle sewing machine comprises a machine base, a rotating shuttle and a needle plate with a needle falling hole, the rotating shuttle and the needle plate are installed on the machine base, the axis of the rotating shuttle is vertically arranged, the vertical plane where the axis of the rotating shuttle and the center line of the needle falling hole are located is a first critical plane, and the horizontal rotating shuttle sewing machine further comprises a thread shifting rod installed on the machine base. The end face, close to the needle falling hole, of the thread shifting rod is provided with a concave thread shifting groove, the thread shifting rod is located below the needle plate and located between the needle falling hole and the rotating shuttle, and the thread shifting rod can move back and forth on the two sides of the first critical face relative to the machine base. The computer horizontal rotating shuttle sewing machine has the advantage of being capable of solving the problem that an existing computer horizontal rotating shuttle sewing machine is poor in sewing reliability.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sewing machine technical field relates to a horizontal shuttle sewing machine. BACKGROUND

[0002] The computer sewing machine is a kind of sewing machine controlled by numerical control system and can automatically complete the set sewing work.The computer sewing machine mainly includes base with workbench, machine head, shuttle, etc., needle bar mechanism is arranged on the machine head, and feeding template for fixing and driving the sewing material to move is arranged on the workbench.During sewing, first, the sewing pattern is input into the computer sewing machine, after the input of the sewing pattern, the numerical control system of the computer sewing machine will generate needle point track according to the pattern and the movement instruction of the feeding template.After the start of sewing, the feeding template will move with the sewing material according to the movement instruction, and the needle bar mechanism drives the needle to perform the needle-down action at each needle point of the needle point track, and cooperates with the shuttle to interweave the top thread and the bottom thread, so as to realize the sewing of the sewing material.

[0003] In the conventional computer sewing machine, the orientation of the machine head and the bottom shuttle system is fixed, i.e., the machine head and the bottom shuttle system do not rotate with the change of the cloth feeding direction, when the computer sewing machine of this type is used to sew the pattern, since the sewing material will move horizontally in different directions with the feeding template, thus it will cause that some of the stitches formed on the final sewing material are forward stitches as shown in Figure 6 , and some are reverse stitches as shown in Figure 7 , and since the forward stitch can usually ensure the beauty and consistency of the sewing stitch on the sewing material, in the occasion of sewing some high-end garments, leather products and other occasions with high requirements on sewing quality, only the forward stitch can be used to sew the product, and the reverse stitch needs to be avoided on the product, but the conventional computer sewing machine obviously cannot meet this requirement.

[0004] In order to solve the above problems, a stretch arm rotating type independent drive automatic sewing equipment (application number: 20B10197712.7) is disclosed in Chinese patent document, which includes an upper machine head and a lower machine head independently driven, the upper machine head includes a machine head lifting assembly, a machine head rotating assembly and a machine head assembly, the machine head rotating assembly is fixed on the machine head lifting assembly, and the machine head assembly is fixed on the lower part of the machine head rotating assembly, the upper machine head can be lifted and can also be adaptively rotated with the lower machine head; the lower machine head includes a bottom thread rotating assembly and a bottom shuttle system, the bottom shuttle system is arranged on the upper part of the bottom thread rotating assembly, and the bottom thread rotating assembly drives the bottom shuttle system to rotate in any direction by 360 degrees; the upper machine head and the lower machine head are also respectively provided with a servo control system, and the servo control system controls the rotation direction of the bottom thread rotating shaft and the rotation speed of the machine head rotating shaft to be the same.

[0005] The following problems exist in the use of the arm-rotating independent drive automatic sewing device: the device rotates along with the feeding direction through the head and the bottom shuttle system to ensure that the needle bar and the rotating shuttle in the bottom shuttle system can automatically adjust the direction according to the direction of the sewing pattern, but the corresponding driving structure and transmission structure need to be added, which leads to a complex mechanism and high precision requirement, and the complex mechanical structure is prone to cumulative error, which leads to the phenomenon that the rotating angle of the head and the bottom shuttle system deviates or the rotating synchronization deviates, thereby affecting the sewing precision and leading to problems such as uneven thread stitches and skipping stitches. SUMMARY

[0006] The utility model aims at the above problems existing in prior art, proposes a horizontal rotating shuttle sewing machine.

[0007] The utility model discloses the technical scheme can be achieved through the following.

[0008] A horizontal rotating shuttle sewing machine, including the base and the rotating shuttle and the needle plate with the needle drop hole that are installed on the base respectively, the axis of the rotating shuttle is vertical arrangement, the axis of the rotating shuttle and the center line of the needle drop hole both are in the vertical plane of the first critical surface, characterized by, this horizontal rotating shuttle sewing machine still includes the thread shifting lever that installs on the base, the end face of the thread shifting lever has the concave thread shifting groove on the close to the needle drop hole, the thread shifting lever is located below the needle plate and is located between the needle drop hole and the rotating shuttle, and the thread shifting lever can move back and forth relative to the base on the two sides of the first critical surface.

[0009] The horizontal rotating shuttle sewing machine adds the thread shifting lever with the "stitch conversion" function, when the last needle point is located in the reverse stitch area range, the thread shifting lever moves back and forth relative to the base on the two sides of the first critical surface, the groove wall of the thread shifting groove on the thread shifting lever can drive the bottom thread between the rotating shuttle and the needle plate, so that part of the bottom thread crosses the axis of the needle, and the bottom thread is loosened when the needle brings the face thread below the needle plate, at this time, the bottom thread cannot be reset to the initial position due to the blockage of the needle, so that the face thread and the bottom thread can always form a forward stitch during the sewing process, and the appearance of the reverse stitch is avoided, by setting the structure of the thread shifting lever, the head and the rotating shuttle do not need to rotate along with the sewing direction, thereby eliminating the problems such as uneven thread stitches and skipping stitches caused by the rotating angle deviation or synchronization deviation of the head and the rotating shuttle, and further solving the problem of poor sewing reliability of the existing computer horizontal rotating shuttle sewing machine.

[0010] Need to explain, the upper spin shuttle has a line outlet for the bottom line to go out, the spin shuttle's axis and the center line of the drop needle hole are in the vertical plane, which is the first critical surface, the spin shuttle's line outlet and the drop needle hole are in the inclined plane, which is the second critical surface, the side of the first critical surface away from the thread shifter and the side of the second critical surface facing the thread shifter are between the reverse stitch area and the remaining area, which is the forward stitch area. For a computer horizontal spin shuttle sewing machine or the same type, because the structure (including the type of spin shuttle, installation position, hooking direction, line outlet position, and needle position) is determined, its first critical surface and second critical surface are also determined, and the reverse stitch area and forward stitch area are also determined. The needle point track refers to the track of the continuous puncture needle points formed on the sewing material by the needle during sewing. In short, it is the route of the needle on the sewing material. The distance between adjacent two needle points is the needle distance. After the needle point track and the movement instruction of the feeding template are determined, the moving path of the sewing material is determined.

[0011] In the above-mentioned horizontal spin shuttle sewing machine, one end of the thread shifter is connected with a positioning column, the other end of the thread shifter is curved upward in an arc shape, the positioning column is movably installed on the machine base, and the size of the positioning column is larger than the size of the thread shifter. The structure is reasonable, the size of the positioning column is larger, which is convenient for the movable installation of the positioning column on the machine base, and the size of the thread shifter is smaller, which can avoid the movement interference between the thread shifter and the needle plate and other structures, and can make the thread shifter better capture the bottom thread between the spin shuttle and the needle plate.

[0012] In the above-mentioned horizontal spin shuttle sewing machine, the mounting end is also connected with a positioning column, the machine base is also provided with a positioning plate, a driving motor and a guide block driven to rotate by the driving motor, the positioning plate is parallel to and vertically arranged with the positioning column, the positioning plate is provided with a positioning groove, the side wall of the guide block is provided with a protruding guide part, the guide block is sleeved on the positioning column, and the guide part of the guide block is clamped in the positioning groove of the positioning plate. The back and forth movement position of the thread shifter relative to the machine base on both sides of the first critical surface is more accurate.

[0013] In the above-mentioned horizontal spin shuttle sewing machine, a crank is arranged on the driving motor, a connecting rod is arranged between the crank and the guide block, one end of the crank is sleeved on the output shaft of the driving motor, the other end of the crank is inserted on one end of the connecting rod through a first bearing, and the bottom of the guide block is inserted on the other end of the connecting rod through a second bearing. The driving motor can better control the back and forth movement of the thread shifter relative to the machine base on both sides of the first critical surface, and the first bearing and the second bearing can improve the durability and use reliability of the transmission structure.

[0014] In the horizontal rotating hook sewing machine, the positioning plate is in U shape with the opening facing the rotating hook, so that the guide part of the guide block can be better clamped in the positioning groove, and the guide block can better move back and forth along the positioning groove under the action of the driving motor.

[0015] In the horizontal rotating hook sewing machine, the thread guide slot is in V shape or U shape, so that the thread guide rod can smoothly capture the bottom thread, and the thread guide rod can better guide or loosen the bottom thread between the rotating hook and the needle plate, thereby improving the reliability of the thread guide rod "stitch conversion".

[0016] Compared with the prior art, the horizontal rotating hook sewing machine has the advantages that: by increasing the thread guide rod with the "stitch conversion" function, the horizontal rotating hook sewing machine can avoid the appearance of reverse stitches during sewing without rotating the head and the rotating hook with the sewing direction, thereby eliminating the problems of uneven stitches and skipping caused by the deviation of the rotating angle or the deviation of the synchronization of the head and the rotating hook, and further solving the problem of poor sewing reliability of the existing computer horizontal rotating hook sewing machine. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is one of the schematic diagrams of the horizontal rotating hook sewing machine.

[0018] Figure 2 is the second schematic diagram of the horizontal rotating hook sewing machine.

[0019] Figure 3 is the exploded view of the driving motor, the guide block, the crank, the connecting rod and the thread guide rod of the horizontal rotating hook sewing machine.

[0020] Figure 4 is the schematic diagram of the horizontal rotating hook sewing machine from the top.

[0021] Figure 5 is the schematic diagram of the thread guide rod moving the bottom thread.

[0022] Figure 6 is the schematic diagram of the forward stitch.

[0023] Figure 7 is the schematic diagram of the reverse stitch.

[0024] In the figure, 1 is the machine base, 2 is the needle plate, 2a is the needle drop hole, 3 is the rotating hook, 3a is the thread outlet, 4 is the thread guide rod, 4a is the thread guide slot, 5 is the positioning column, 6 is the positioning plate, 6a is the positioning groove, 7 is the driving motor, 8 is the guide block, 8a is the guide part, 9 is the crank, 10 is the connecting rod, 11 is the first bearing, 12 is the second bearing, A is the first critical surface, B is the second critical surface, a is the reverse stitch area, and b is the forward stitch area. DETAILED DESCRIPTION

[0025] The utility model discloses a specific embodiment as follows and further describes the technical scheme of the utility model with reference to the drawings, but the utility model is not limited to these embodiments.

[0026] Embodiment one

[0027] A horizontal rotating hook sewing machine, referring to Figures 1-7 , including base 1 and rotating hook 3 and needle plate 2 with needle drop hole 2a respectively installed on base 1, the axis of rotating hook 3 is vertically arranged, the axis of rotating hook 3 and the center line of needle drop hole 2a are both in the vertical plane of first critical surface A, and the horizontal rotating hook sewing machine further includes thread shifting lever 4 installed on base 1, the end face of thread shifting lever 4 is provided with concave thread shifting groove 4a, thread shifting lever 4 is located below needle plate 2 and between needle drop hole 2a and rotating hook 3, and thread shifting lever 4 can move back and forth on both sides of first critical surface A relative to base 1.

[0028] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 4 , in particular, one end of thread shifting lever 4 is connected with positioning column 5, the other end of thread shifting lever 4 is curved upwards in arc shape, positioning column 5 is movably installed on base 1, and the size of positioning column 5 is greater than the size of thread shifting lever 4.

[0029] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 4 , more specifically, positioning plate 6, driving motor 7 and guide block 8 driven and moved by driving motor 7 are further installed on base 1, positioning plate 6 is parallel to positioning column 5 and vertically arranged, positioning plate 6 is provided with positioning groove 6a, the side wall of guide block 8 is provided with protruding guide part 8a, guide block 8 is sleeved on positioning column 5, and guide part 8a of guide block 8 is clamped in positioning groove 6a of positioning plate 6.

[0030] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 4 , more specifically, crank 9 is arranged on driving motor 7, connecting rod 10 is arranged between crank 9 and guide block 8, one end of crank 9 is sleeved on the output shaft of driving motor 7, the other end of crank 9 is inserted on one end of connecting rod 10 through first bearing 11, crank 9 is connected to the outer ring of first bearing 11, the bottom of guide block 8 is inserted on the other end of connecting rod 10 through second bearing 12, and guide block 8 is connected to the inner ring of second bearing 12.

[0031] Preferably, the positioning plate 6 is in the shape of a U with the opening facing the rotating hook 3; and the wire slot 4a is in the shape of a V or a U.

[0032] The working principle of the horizontal rotating hook sewing machine is described as follows:

[0033] The rotating hook 3 has a thread outlet 3a for the bottom thread to pass through, and the vertical plane in which the axis of the rotating hook 3 and the center line of the drop needle hole 2a are located is the first critical plane A, and the inclined plane in which the thread outlet 3a of the rotating hook 3 and the drop needle hole 2a are connected is the second critical plane B. When the hook tip of the rotating hook moves to the needle, the area between the side of the first critical plane A facing away from the thread outlet and the side of the second critical plane B facing away from the hook tip is the reverse stitch area a, and the remaining area is the forward stitch area b. For a certain computerized horizontal rotating hook sewing machine or the same type of computerized horizontal rotating hook sewing machine, since the structure (including the type, installation position, thread hooking direction of the rotating hook 3, position of the thread outlet 3a, and position of the needle) is determined, the first critical plane A and the second critical plane B are also determined, and the reverse stitch area a and the forward stitch area b are also determined. The needle point track refers to the track of the continuous puncture needle points formed by the needle on the sewing material during the sewing process. In simple terms, it is the route that the needle "walks" on the sewing material, and the distance between two adjacent needle points is the needle pitch. After the needle point track and the movement instructions of the feeding template are determined, the moving path of the sewing material is determined.

[0034] During operation, the fabric is fixed on the feed template of the horizontal rotary hook sewing machine and moved by the feed template. The needle point trajectory is obtained according to the sewing pattern, and the movement command of the feed template is determined based on the needle point trajectory. The feed template moves the fabric to one of the needle points on the needle point trajectory according to the movement command to sew the first stitch. Then, the feed template continues to move the fabric to the next stitch position according to the movement command and performs the following steps: If the previous stitch point is outside the reverse stitch area a, the needle moves downwards to bring the top thread to the bottom of the needle plate, and the rotary hook interweaves the top thread and bottom thread to form a stitch; if the previous stitch point is inside the reverse stitch area a, the drive motor 7 controls the movement of the thread guide lever 4 (specifically, the drive motor 7 drives the crank 9 connected to its output shaft to rotate synchronously, and the crank 9 drives the connecting rod 10 connected to it to rotate, but because the other end of the connecting rod 10 is connected to a guide block 8 locked in the positioning groove 6a of the positioning plate 6, the connecting rod 10 can only drive...). The guide block 8 moves along the positioning groove 6a. Simultaneously, the guide block 8 drives the positioning post 5 connected to it to move synchronously. The forward and reverse rotation of the drive motor 7 enables the thread-picking lever 4 connected to the positioning post 5 to move back and forth relative to the machine base 1 on both sides of the first critical surface A. This causes the groove wall of the thread-picking groove 4a on the thread-picking lever 4 to act on the bottom thread between the rotary hook 3 and the needle plate 2 (the portion of the bottom thread below the needle plate 2 is slightly inclined from the thread outlet 3a towards the needle drop hole 2a; during movement, the V-shaped or U-shaped thread-picking groove 4a on the thread-picking lever 4, located between the needle drop hole 2a and the rotary hook 3, can smoothly capture this portion of the bottom thread located below the needle plate 2 and close to the needle drop hole 2a). This causes a portion of the bottom thread to cross the axis of the needle. Then, the needle moves downwards, bringing the top thread below the needle plate 2. The thread-picking lever 4 releases the bottom thread, and the rotary hook 3 interweaves the top thread and bottom thread to form a stitch. The above steps are repeated continuously, and subsequent sewing is performed according to the needle point trajectory obtained from the sewing pattern. (Refer to...) Figure 5 The diagram clearly shows the state of the bobbin thread before and after the thread lever 4 moves. In the diagram, the thick solid line T represents the position of the bobbin thread between the rotary hook 3 and the needle plate 2 when the thread lever 4 is not performing the thread-pulling action. The thin solid line t represents the position of the bobbin thread between the rotary hook 3 and the needle plate 2 after the thread lever 4 performs the thread-pulling action. As can be seen from the thin solid line t, a portion of the bobbin thread crosses the axis of the needle. When the needle moves downwards and brings the top thread below the needle plate 2, the thread lever 4 releases the bobbin thread. At this point, due to the obstruction of the needle, the bobbin thread cannot return to its initial position. Thus, during the tightening process as the needle moves upwards, both the bobbin thread and the top thread on the fabric are on the same side of the top thread on the needle. This prevents the top thread on the needle from being... Figure 7 Similarly, the fabric is tightened by passing the thread between the bottom thread and the top thread, thus preventing the top thread from tangling with the bottom thread, ultimately forming a shape like... Figure 6 The positive line trace shown.

[0035] Example 2

[0036] The structure and principle of this embodiment are basically the same as those of Embodiment One, with the difference that the thread shifting lever 4 is in the shape of a "Z" (not shown in the figures).

[0037] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the specific embodiments described or use similar ways to replace them, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

[0038] Although the terms such as the machine base 1, the needle plate 2, the needle drop hole 2a, the rotating shuttle 3, the thread shifting lever 4, the thread shifting groove 4a, the positioning column 5, the positioning plate 6, etc. are used more frequently herein, the possibility of using other terms is not excluded. These terms are used only for the convenience of describing and explaining the essence of the present application; any interpretation of them as an additional limitation is contrary to the spirit of the present application.

Claims

1. A horizontal rotary shuttle sewing machine, comprising a machine base (1) and a rotary shuttle (3) and a needle plate (2) having a needle drop hole (2a) respectively mounted on the machine base (1), wherein the axis of the rotary shuttle (3) is vertically arranged, and the vertical plane containing the axis of the rotary shuttle (3) and the center line of the needle drop hole (2a) is a first critical plane (A), characterized in that, This horizontal rotary hook sewing machine also includes a thread guide lever (4) mounted on the machine base (1). The thread guide lever (4) has a concave thread guide groove (4a) on the end face near the needle drop hole (2a). The thread guide lever (4) is located below the needle plate (2) and between the needle drop hole (2a) and the rotary hook (3). The thread guide lever (4) can move back and forth relative to the machine base (1) on both sides of the first critical surface (A).

2. A horizontal rotary hook sewing machine according to claim 1, characterized in that, One end of the dial rod (4) is connected to a positioning post (5), and the other end of the dial rod (4) is bent upward in an arc shape. The positioning post (5) is movably installed on the base (1), and the size of the positioning post (5) is larger than the size of the dial rod (4).

3. A horizontal rotary hook sewing machine according to claim 2, characterized in that, The base (1) is also equipped with a positioning plate (6), a drive motor (7), and a guide block (8) driven by the drive motor (7). The positioning plate (6) is parallel to the positioning post (5) and is arranged vertically. The positioning plate (6) has a positioning groove (6a). The guide block (8) has a protruding guide part (8a) on its side wall. The guide block (8) is sleeved on the positioning post (5), and the guide part (8a) of the guide block (8) is engaged in the positioning groove (6a) of the positioning plate (6).

4. A horizontal rotary hook sewing machine according to claim 3, characterized in that, A crank (9) is provided on the drive motor (7), and a connecting rod (10) is provided between the crank (9) and the guide block (8). One end of the crank (9) is sleeved on the output shaft of the drive motor (7), and the other end of the crank (9) is inserted into one end of the connecting rod (10) through a first bearing (11). The bottom of the guide block (8) is inserted into the other end of the connecting rod (10) through a second bearing (12).

5. A horizontal rotary hook sewing machine according to claim 3, characterized in that, The positioning plate (6) is U-shaped with its opening facing the rotary shuttle (3).

6. A horizontal rotary hook sewing machine according to any one of claims 1-5, characterized in that, The wire groove (4a) is V-shaped or U-shaped.

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