Rotating shuttle with adjustable pressing sheet tip

Abstract

The rotating shuttle comprises a rotating shuttle frame, a rotating shuttle race, a rotating shuttle plate and a thread guide plate, the rotating shuttle plate and the thread guide plate are fixed to the side edge of the rotating shuttle race through fastening screws respectively, the rotating shuttle plate comprises the pressing piece tip and a shuttle plate body which are in a separated state, the pressing piece tip comprises a top plate, a side plate and a tip end, a U-shaped groove is formed in the side plate, and the top plate is connected with the top plate. The U-shaped groove comprises an inclined section, the symmetrical line of the inclined section points to the tip end, an included angle alpha is formed between the symmetrical line of the inclined section and the horizontal line, the two ends of the inclined section are arranged at the outer end point of the middle portion and the tail portion respectively, screw holes are formed in the side edges, and the U-shaped groove is fixedly connected with the screw holes through positioning bolts. The part, making contact with the top plate, of the top face of the side edge is provided with a cut short face, the cut short face makes contact with the bottom face of the top plate to form a receding gap, and when the positioning bolt is arranged at the outer end point, the cut short face is matched with the top plate through the receding gap. The rotating shuttle disclosed by the utility model can adapt to different thread-off duration requirements.

Description

Technical Field

[0001] The utility model belongs to the technical field of rotary shuttles, and particularly relates to a rotary shuttle with an adjustable presser foot tip. Background Art

[0002] A rotary shuttle is used to hook the upper thread on the sewing machine needle and rotate it, then bypass the bottom thread in the bobbin of the inner bobbin holder of the rotary shuttle to form a stitch. The rotary shuttle is composed of a rotary shuttle bed and a rotary shuttle frame. The rotary shuttle bed and the rotary shuttle frame are matched through a guide groove in the rotary shuttle bed and a guide rail on the rotary shuttle frame. During operation, the rotary shuttle bed rotates on the rotary shuttle frame. There is a rotary shuttle plate on the outer circumference of the outer bobbin holder. The rotary shuttle plate just fits the outer surface of the rotary shuttle bed and is then fixedly connected to the rotary shuttle bed by screws. When the rotary shuttle rotates during operation, the wire guide plate and the rotary shuttle plate fixed on the rotary shuttle bed rotate together with the rotary shuttle bed, and the rotary shuttle frame remains stationary. The rotary shuttle plate includes a presser foot tip, and the length of the presser foot tip affects the speed of the hooked loop being released. Lockstitch is applicable to sewing materials such as cotton, wool fabrics or leather with a small shrinkage rate. For sewing materials of different thicknesses, the speed of releasing the thread needs to correspond to the thickness of the sewing material. The thicker the sewing material, the longer the thread release time, and vice versa. In practical applications, rotary shuttles are often divided into multiple models according to the different lengths of the presser foot tips of the rotary shuttle plates to meet the requirements of sewing materials of different thicknesses, making the matching of rotary shuttles complicated. Content of the Utility Model

[0003] The problem to be solved by the utility model is to provide a rotary shuttle with an adjustable presser foot tip that can expand the scope of use and meet the requirements of different thread release time lengths.

[0004] To solve the above problems, the utility model provides a rotary shuttle with an adjustable presser foot tip, including a rotary shuttle body. The rotary shuttle body includes a rotary shuttle frame, a rotary shuttle bed, a rotary shuttle plate and a wire guide plate. The rotary shuttle plate and the wire guide plate are respectively fixed on the side of the rotary shuttle bed by fastening screws. The rotary shuttle plate includes a presser foot tip; the rotary shuttle plate further includes a shuttle plate body, and the presser foot tip is in a separated state from the shuttle plate body. The presser foot tip includes a top plate, side plates and a tip. There is a U-shaped groove in the side plates. The U-shaped groove includes an inclined section. The symmetry line of the inclined section points to the tip and forms an angle α with the horizontal line, 0°≤α≤60°. The two ends of the inclined section are respectively an outer end point and a tail placed in the middle. There is a screw hole on the side. The U-shaped groove is fixedly connected to the screw hole through a positioning bolt. When the presser foot tip is combined with the shuttle plate body to form the shape of the rotary shuttle plate, the positioning bolt is placed at the outer end point. There is a trimmed surface at the part where the top surface of the side contacts the bottom surface of the top plate. The part where the trimmed surface contacts the bottom surface of the top plate forms an avoidance gap. When the positioning bolt is placed at the outer end point, the avoidance gap makes the trimmed surface fit the top plate.

[0005] Beneficial effects: Since the pressing tip is in a separated state from the shuttle plate body, the pressing tip is fixed to the side of the rotary shuttle bed through the positioning bolt and the U-shaped groove on the side plate, enabling the pressing tip to adjust the distance from the screw hole on the side of the rotary shuttle bed along the U-shaped groove, thereby adjusting the distance between the pressing tip and the shuttle plate body. As a result, the pressing tip of the adjusted rotary shuttle plate achieves the effect of being long or short. When the pressing tip of the rotary shuttle plate is long, the thread shedding time is long; when the pressing tip of the rotary shuttle plate is short, the thread shedding time is short. Thus, the rotary shuttle expands its scope of use and adapts to different thread shedding duration requirements, simplifying the model specifications of various rotary shuttles. The included angle α of the inclined section causes the tip of the pressing tip to move obliquely upward while being pushed away from the shuttle plate body along the inclined section, ensuring smooth thread shedding.

[0006] As a further improvement of the above technical solution, the U-shaped groove further includes a horizontal section that communicates with the outer end point. When the positioning bolt is placed at the front end of the horizontal section, the distance between the pressing tip and the adjacent side surface of the shuttle plate body is approximately 1.5 - 2 mm. This improvement optimizes the adjustment path when the pressing tip needs to be shortened. The horizontal section is mainly used for the pressing tip to move towards the shuttle plate body. At this time, the pressing tip only needs to translate without moving downward to achieve the effect of shortening the thread shedding time. Since there is no downward movement in the horizontal section, there is no need to further reduce the height of the trimmed surface, which is beneficial for the trimming surface to correct the movement of the pressing tip along the inclined section.

[0007] As a specific solution of the above technical solution, the height of the avoidance gap is 1 - 1.5 mm, the radius of the positioning bolt is r, the length of the horizontal section is r + 1.5 mm, and the length of the inclined section is r + 1.8 mm. This specific solution is sufficient to apply to the thickness range that the sewing material may have. Description of the Drawings

[0008] Figure 1 is a three-dimensional view of a rotary shuttle L with an adjustable pressing tip according to the present utility model;

[0009] Figure 2 is an assembly drawing of a rotary shuttle bed, a rotary shuttle plate, and a wire guide plate;

[0010] Figure 3 is an exploded view of the structures of a rotary shuttle bed, a rotary shuttle plate, and a wire guide plate;

[0011] Figure 4 is a three-dimensional view of the pressing tip;

[0012] Figure 5 is the front view of the pressing tip;

[0013] Figure 6 is Figure 3 a partial enlarged view of B in

[0014] Figure 7 is a partial internal perspective schematic diagram of the assembly of the pressing tip and the rotary shuttle bed;

[0015] Figure 8 is Figure 2 a partial enlarged view of A;

[0016] Figure 9 is Figure 2 a schematic diagram of the state where the tail of the U-shaped groove corresponds to the screw hole in the partial enlarged view of A.

[0017] In the figure: 1. Rotating shuttle frame; 4. Rotating shuttle bed; 2. Rotating shuttle plate; 3. Wire guide plate; 100. Rotating shuttle body; 41. Screw hole; 42. Side; 421. Dwarfed surface; 422. Avoidance gap; 21. Pressing piece tip; 211. Top plate; 22. Rotating shuttle body; 212. Side plate; 213. Tip; 214. U-shaped groove; 2141, 2142. Outer end points; 2143. Tail; 2144. Horizontal section; Inclined section; 2145. Front end; 215. Positioning bolt. Specific embodiments

[0018] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention and the accompanying drawings of the specification.

[0019] Refer to Figure 1 , a rotating shuttle with an adjustable pressing piece tip according to this embodiment includes a rotating shuttle body 100. The rotating shuttle body 100 includes a rotating shuttle frame 1, a rotating shuttle bed 4, a rotating shuttle plate 2, and a wire guide plate 3. The rotating shuttle plate 2 and the wire guide plate 3 are respectively fixed on the side 42 of the rotating shuttle bed 4 by fastening screws. The rotating shuttle plate 2 includes a pressing piece tip 21.

[0020] Refer to Figure 2 and Figure 3 , the rotating shuttle plate 2 further includes a shuttle plate body 22, and the pressing piece tip 21 is in a separated state from the shuttle plate body 22.

[0021] Refer to Figure 4 , the pressing piece tip 21 includes a top plate 211, a side plate 212, and a tip 213.

[0022] Refer to Figure 5 , a U-shaped groove 214 is formed in the side plate 212. The U-shaped groove 214 includes an inclined section 2141 and a horizontal section 2144. The symmetry line of the inclined section 2141 points to the tip 213 and forms an angle α with the horizontal line, where 0° ≤ α ≤ 60°. The two ends of the inclined section 2141 are respectively an outer end point 2142 and a tail 2143 placed in the middle. The horizontal section 2144 is connected to the outer end point 2142. Combining Figure 3 , the radius of the positioning bolt 215 is r, the length of the horizontal section 2144 is r + 1.5 mm, and the length of the inclined section 2141 is r + 1.8 mm.

[0023] Combining Figure 3, screw holes 41 are provided on the side 42, and the U-shaped groove 214 is fixedly connected to the screw holes 41 through positioning bolts 215. In combination with Figure 2 , when the pressing piece tip 21 and the shuttle plate body 22 are combined to form the shape of the rotating shuttle plate 2, the positioning bolt 215 is placed at the outer end point 2142.

[0024] See Figure 4 and Figure 6 , the part where the top surface of the side 42 contacts the bottom surface of the top plate 211 has a chamfered surface 421. In combination with Figure 7 , a clearance gap 422 is formed at the part where the chamfered surface 421 contacts the bottom surface of the top plate 211, and the height of the clearance gap 422 is 1 - 1.5 mm.

[0025] In combination with Figure 3 , Figure 5 and Figure 7 , when the positioning bolt 215 is placed at the outer end point 2142, the clearance gap 422 makes the chamfered surface 421 adapt to the top plate 211.

[0026] See Figure 8 , when the positioning bolt 215 and the screw hole 42 are placed at the front end 2145 of the horizontal section 2144, the distance L between the pressing piece tip 21 and the adjacent side surface of the shuttle plate body 22 is about 1.5 - 2 mm. At this time, the distance between the pressing piece tip 21 and the rotating shuttle body 22 is the closest, and during operation, the thread-off time of the rotating shuttle is the shortest.

[0027] See Figure 9 , when the positioning bolt 215 and the screw hole 42 are placed at the tail 2143, the distance between the pressing piece tip 21 and the rotating shuttle body 22 is the farthest, and during operation, the thread-off time of the rotating shuttle is the longest.

Claims

1. A rotating hook with an adjustable presser point tip, comprising a rotating hook body (100), the rotating hook body (100) includes a rotating hook frame (1), a rotating hook bed (4), a rotating hook plate (2) and a wire guide plate (3), the rotating hook plate (2) and the wire guide plate (3) are respectively fixed on the side (42) of the rotating hook bed (4) by fastening screws, and the rotating hook plate (2) includes a presser point tip (21). It is characterized in that: The rotating hook plate (2) further includes a hook plate body (22), the presser point tip (21) is in a separated state from the hook plate body (22), the presser point tip (21) includes a top plate (211), side plates (212) and a tip (213), a U-shaped groove (214) is formed in the side plates (212), the U-shaped groove (214) includes an inclined section (2141), the symmetry line of the inclined section (2141) points to the tip (213) and forms an angle α with the horizontal line, 0° ≤ α ≤ 60°, the two ends of the inclined section (2141) are respectively an outer end point (2142) and a tail (2143) placed in the middle, a screw hole (41) is provided on the side (42), the U-shaped groove (214) is fixedly connected to the screw hole (41) through a positioning bolt (215), when the presser point tip (21) is combined with the hook plate body (22) to form the shape of the rotating hook plate (2), the positioning bolt (215) is placed at the outer end point (2142), and a trimmed surface (421) is formed at the part where the top surface of the side (42) contacts the bottom surface of the top plate (211), and a clearance gap (422) is formed at the part where the trimmed surface (421) contacts the bottom surface of the top plate (211), when the positioning bolt (215) is placed at the outer end point (2142), the clearance gap (422) makes the trimmed surface (421) adapt to the top plate (211).

2. The rotating shuttle with an adjustable presser point according to claim 1, characterized in that: The U-shaped groove (214) further includes a horizontal section (2144), the horizontal section (2144) is connected to the outer end point (2142), when the positioning bolt (215) is placed at the front end (2145) of the horizontal section (2144), the distance between the presser point tip (21) and the adjacent side surface of the hook plate body (22) is about 1.5 - 2 mm.

3. The rotating shuttle with an adjustable presser point according to claim 2, characterized in that: The height of the clearance gap (422) is 1 - 1.5 mm, the radius of the positioning bolt (215) is r, the length of the horizontal section (2144) is r + 1.5 mm, and the length of the inclined section (2141) is r + 1.8 mm.

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