Belt feeding mechanism of sewing machine

Abstract

The utility model provides a belt feeding mechanism of a sewing machine, and belongs to the technical field of sewing machines. The technical problem that an existing belt conveying mechanism cannot keep a belt pressing roller at the position away from a belt conveying roller is solved. The belt conveying mechanism of the sewing machine comprises a belt conveying frame, a belt conveying roller, a pressing support and a belt pressing roller, the belt conveying roller is rotationally connected to the belt conveying frame, the belt pressing roller is rotationally connected to the pressing support, the pressing support is hinged to the belt conveying frame and presses and fits the belt pressing roller to the belt conveying roller, an elastic piece is arranged on the belt conveying frame, one end of the elastic piece is fixed to the belt conveying frame, and the other end of the elastic piece is fixed to the belt conveying roller. The other end of the elastic piece is provided with a buckling part, the pressing support is provided with a positioning part, and when the pressing support rotates to the position where the positioning part is buckled with the buckling part, the belt pressing roller is located at the position away from the belt conveying roller. The belt pressing device has the advantage that the belt pressing roller can be kept at the position far away from the belt conveying roller.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines and relates to a sewing machine, in particular to a tape feeding mechanism of the sewing machine. Background Art

[0002] When sewing elastic bands, the elastic bands need to be stretched in and then sewn with the fabric, which requires a feeding device. For example, a Chinese patent document discloses a feeding device for elastic bands for sewing machines [Application No. 202222385273.5], which includes a power part, an active pressure pulley rotatably arranged on a mounting frame, the active pressure pulley is driven to rotate by the power part, a roller pressure adjustment shaft is provided on the mounting frame, a handle is provided at one end of the roller pressure adjustment shaft, the driven pressure pulley is connected to the roller pressure adjustment shaft through a clamping shaft frame, an adjustment component is provided on the mounting frame on one side of the handle, the adjustment component abuts on the handle to control the pressure between the active pressure pulley and the driven pressure pulley; a pressure plate and a pressure frame are also provided on the mounting frame, the pressure plate has a strip hole for the elastic band to pass through, and the pressure frame is mounted above the pressure plate. In this patent, the tensioning belt is compressed and then transported by pressing the driven pressure pulley on the active pressure pulley. In actual use, the length of the elastic belt is limited. Therefore, when a roll of elastic belt is used up, another roll of elastic belt needs to be reloaded. During this process, the driven pressure pulley needs to be lifted before operation. Currently, one hand is required to lift the driven pressure pulley all the time and the other hand is required to place the elastic belt, which makes operation inconvenient. Moreover, the position of the elastic belt cannot be accurately placed with one hand, and repeated adjustments are required, which reduces production efficiency. Utility Model Content

[0003] The purpose of the utility model is to solve the above problems in the existing technology and propose a tape feeding mechanism for a sewing machine. The technical problem solved by the utility model is to keep the tape pressing roller at a position away from the tape feeding roller.

[0004] The purpose of this utility model can be achieved through the following technical solutions:

[0005] A tape feeding mechanism of a sewing machine comprises a tape feeding frame, a tape feeding roller, a pressing bracket and a tape pressing roller, wherein the tape feeding roller is rotatably connected to the tape feeding frame, the tape pressing roller is rotatably connected to the pressing bracket, the pressing bracket is hinged on the tape feeding frame and presses the tape pressing roller tightly against the tape feeding roller, and is characterized in that an elastic sheet is provided on the tape feeding frame, one end of the elastic sheet is fixed to the tape feeding frame, and a buckle portion is provided on the other end of the elastic sheet, and a positioning portion is provided on the pressing bracket, and when the pressing bracket rotates until the positioning portion and the buckle portion are buckled, the tape pressing roller is located away from the tape feeding roller.

[0006] When in use, the belt holding roller is pressed against the belt feeding roller, and the belt feeding roller rotates to convey the elastic belt; when the elastic belt needs to be removed or installed, the holding bracket is rotated and lifted, and when the holding bracket is rotated until the positioning part and the buckle part are engaged, the holding bracket is positioned, and the belt holding roller is located at a position away from the belt feeding roller and maintained, that is, there is no need to lift the holding bracket with hands all the time, and both hands can be freed to remove or install the elastic belt, which is more convenient and improves efficiency. After completing the operation, only the positioning part and the buckle part need to be unlocked by turning the elastic sheet; the elastic deformation of the elastic sheet can automatically buckle the positioning part and the buckle part when the holding bracket rotates.

[0007] In the aforementioned tape feed mechanism of the sewing machine, the snap-on portion is a bent section of the elastic sheet that bends toward the side of the pressing bracket, and the positioning portion is a protrusion on the pressing bracket that protrudes toward the side of the elastic sheet. The end of the snap-on portion is located on the rotational trajectory of the positioning portion, and the positioning portion can abut and engage with the snap-on portion. When engaged, the pressing bracket rotates, and the positioning portion rotates to a position abutting against the snap-on portion. Continued rotation pushes the elastic sheet outward, causing it to tilt and deform until the positioning portion and the snap-on portion engage, causing the elastic sheet to rebound and return to its original position.

[0008] In the above-mentioned tape feeding mechanism of the sewing machine, the positioning portion is "V"-shaped, including a push-away surface and a rest surface, the rest surface is parallel to the swing arm, and the angle between the push-away surface and the rest surface is an acute angle. When the tape pressing roller is pressed tightly against the tape feeding roller, the push-away surface faces the buckle portion, and when the positioning portion and the buckle portion are buckled, the rest surface rests against the buckle portion.

[0009] In the aforementioned tape feed mechanism of the sewing machine, the elastic sheet is further provided with a limiting portion opposite the snap portion. The limiting portion is a bent section of the elastic sheet that bends toward the side of the pressing bracket. A snap notch is formed between the limiting portion and the positioning portion, and the positioning portion is positioned within the snap notch when engaged with the snap portion. The limiting portion is capable of limiting the rotation angle of the pressing bracket after the pressing bracket rotates to the engaged position between the positioning portion and the snap portion.

[0010] As another example, in the aforementioned tape feed mechanism of the sewing machine, the snap-fit ​​portion is a snap-fit ​​hole formed in the elastic sheet, the positioning portion is a protrusion on the clamping bracket that protrudes toward one side of the elastic sheet, the snap-fit ​​portion is located on a rotational trajectory of the positioning portion, and the positioning portion can be snapped into the snap-fit ​​portion. The snap-fitting of the positioning portion and the snap-fit ​​portion is achieved by the structure of the snap-fit ​​hole and the protrusion.

[0011] As another example, in the aforementioned tape feed mechanism of the sewing machine, the positioning portion is a slot formed on the pressing bracket, the snap portion is a bent section of the elastic sheet bent toward one side of the pressing bracket, the end of the snap portion is disposed upward, the snap portion always abuts against the pressing bracket, and when the pressing bracket is rotated until the snap portion and the positioning portion are aligned, the snap portion snaps into the positioning portion and snaps in. The snapping of the positioning portion and the snap portion is achieved by the structure of the slot and the bent section.

[0012] In the above-mentioned tape feeding mechanism of the sewing machine, the clamping bracket includes a rotating shaft rotatably connected to the tape feeding frame and swing arms located at both ends of the rotating shaft, one end of the two swing arms is fixed to the rotating shaft, the tape holding roller is rotatably connected between the other ends of the two swing arms, the elastic sheet is located in front of the other end of one of the swing arms, and the positioning portion is located at the end of the other end of the above-mentioned swing arm.

[0013] As another case, in the tape feeding mechanism of the above-mentioned sewing machine, the clamping bracket includes a rotating shaft rotatably connected to the tape feeding frame and swing arms located at both ends of the rotating shaft, one end of the two swing arms is fixed to the rotating shaft, the tape pressing roller is rotatably connected between the other ends of the two swing arms, the elastic sheet is located on the outside of one of the swing arms, and the positioning portion is located on the outer side wall of the above-mentioned swing arm.

[0014] In the above-mentioned tape feeding mechanism of the sewing machine, a pressing section is provided at the end of the elastic sheet, and the pressing section is bent toward the side away from the tape holding roller. When in use, the pressing section is pressed by a finger to bend the elastic sheet to disengage the positioning portion and the buckle portion.

[0015] In the above-mentioned tape feeding mechanism of the sewing machine, the elastic sheet is a metal spring sheet.

[0016] Compared with the prior art, the tape feeding mechanism of the sewing machine can keep the tape pressing roller away from the tape feeding roller, freeing both hands when changing the elastic band, thereby having the advantages of convenient operation and improved efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural diagram of the tape feeding mechanism of the sewing machine.

[0018] Figure 2 It is a schematic diagram of the three-dimensional structure when the belt pressing roller of the belt feeding mechanism is located away from the belt feeding roller.

[0019] Figure 3 It is a side structural schematic diagram of the belt feeding mechanism when the belt pressing roller is pressed against the belt feeding roller.

[0020] Figure 4 It is a side structural schematic diagram when the belt pressing roller of the belt feeding mechanism is located away from the belt feeding roller.

[0021] Figure 5 It is a schematic diagram of the three-dimensional structure of the elastic sheet.

[0022] In the figure, 1. tape feed frame; 11. driving motor; 12. tape feed roller; 2. clamping bracket; 21. rotating shaft; 22. swing arm; 23. positioning part; 231. pushing surface; 232. abutting surface; 24. handle; 25. tape pressing roller; 3. elastic sheet; 31. buckle part; 32. limiting part; 33. bayonet; 34. pressing section. DETAILED DESCRIPTION

[0023] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0024] Example 1

[0025] like Figures 1 to 5 As shown, the tape feeding mechanism of the sewing machine includes a tape feeding frame 1, a tape feeding roller 12, a clamping bracket 2 and a tape holding roller 25. The tape feeding roller 12 is rotatably connected to the tape feeding frame 1, and a driving motor 11 for driving the tape feeding roller 12 to rotate is installed on the tape feeding frame 1; the clamping bracket 2 includes a rotating shaft 21 rotatably connected to the tape feeding frame 1 and swing arms 22 located at both ends of the rotating shaft 21, one end of the two swing arms 22 is fixed to the rotating shaft 21, and the tape holding roller 25 is rotatably connected between the other ends of the two swing arms 22, and a torsion spring is provided between the rotating shaft 21 and the tape feeding frame 1, and the torsion spring can enable the clamping bracket 2 to press the tape holding roller 25 onto the tape feeding roller 12, and a handle 24 is fixed to one end of the rotating shaft 21 for convenient operation when the clamping bracket 2 is lifted.

[0026] The tape feed frame 1 is provided with an elastic sheet 3, which is a metal spring sheet in the shape of a long strip. The elastic sheet 3 is located in front of the other end of one of the swing arms 22. One end of the elastic sheet 3 is fixed to the tape feed frame 1, and the other end of the elastic sheet 3 is provided with a snapping portion 31. The snapping portion 31 is a bent section on the elastic sheet 3 bent toward the side of the clamping bracket 2. The end of the other end of the swing arm 22 is provided with a positioning portion 23. The positioning portion 23 is a convex portion on the clamping bracket 2 that protrudes toward the side of the elastic sheet 3. The end of the snapping portion 31 is located on the rotation trajectory of the positioning portion 23. The positioning portion 23 is "V"-shaped, including a push-off surface 231 and a rest surface 232. The rest surface 232 is coplanar with the side surface of the swing arm 22. The angle between the push-off surface 231 and the rest surface 232 is an acute angle. Preferably, in this embodiment, the push-off surface 231 and the rest surface 232 The included angle is 30°, 42° or 60°. When the belt hold roller 25 is pressed tightly against the belt feed roller 12, the push-away surface 231 is pushed toward the buckle portion 31. When the swing arm 22 rotates, the push-away surface 231 abuts against the buckle portion 31 and pushes the elastic sheet 3 to deform outward until the positioning portion 23 passes over the buckle portion 31. After the elastic sheet 3 is deformed and rebounds, the abutting surface 232 abuts against the buckle portion 31 when the positioning portion 23 is buckled with the buckle portion 31; the elastic sheet 3 is also provided with a limiting portion 32 opposite to the buckle portion 31, the limiting portion 32 is a bent section on the elastic sheet 3 bent toward one side of the clamping bracket 2, and a bayonet 33 is formed between the limiting portion 32 and the positioning portion 23. When the positioning portion 23 is buckled with the buckle portion 31, it is located in the bayonet 33, and the end of the elastic sheet 3 is provided with a pressing section 34, which is bent toward the side away from the belt hold roller 25. When the pressing bracket 2 rotates until the positioning portion 23 is engaged with the buckle portion 31 , the belt holding roller 25 is located away from the belt feeding roller 12 .

[0027] When in use, the tape feed roller 12 is driven to rotate by the driving motor 11, and the belt holding roller 25 is pressed against the tape feed roller 12 under the action of the torsion spring to realize the conveyance of the elastic band; when it is necessary to remove or install the elastic band, the pressing bracket 2 is rotated and lifted, and when the pressing bracket 2 is rotated to the positioning portion 23 and the buckle portion 31 are buckled, the pressing bracket 2 is positioned. At this time, the belt holding roller 25 is located at a position away from the tape feed roller 12 and maintained, that is, there is no need to lift the pressing bracket 2 with hands all the time, and both hands can be freed to remove or install the elastic band, which is more convenient and improves efficiency. After completing the operation, you only need to move the elastic sheet 3 to unfasten the positioning portion 23 and the buckle portion 31; the elastic deformation of the elastic sheet 3 can automatically buckle the positioning portion 23 and the buckle portion 31 when the pressing bracket 2 rotates.

[0028] Example 2

[0029] This embodiment has essentially the same structure and principle as the first embodiment, differing in that the hold-down bracket includes a shaft rotatably connected to the tape feed frame and swing arms located at either end of the shaft. One end of each swing arm is fixed to the shaft, and the tape hold roller is rotatably connected between the other ends of the two swing arms. The elastic sheet is located on the outside of one of the swing arms, and the positioning portion is located on the outer wall of the swing arm. This structure provides an alternative mounting position for the elastic sheet relative to the swing arm.

[0030] Example 3

[0031] This embodiment has essentially the same structure and principle as the first embodiment, differing in that the snap-fit ​​portion is a snap-fit ​​hole formed in the elastic sheet, the positioning portion is a protrusion on the clamping bracket that protrudes toward the elastic sheet, the snap-fit ​​portion is located along the rotational trajectory of the positioning portion, and the positioning portion can snap into the snap-fit ​​portion for engagement. The snap-fitting of the positioning portion and the snap-fit ​​portion is achieved through the structure of the snap-fit ​​hole and the protrusion.

[0032] Example 4

[0033] This embodiment has essentially the same structure and principle as the first embodiment, differing in that the positioning portion is a slot formed on the clamping bracket, the snap-fit ​​portion is a bent section of an elastic sheet bent toward the side of the clamping bracket, the end of the snap-fit ​​portion is positioned upward, and the snap-fit ​​portion always rests against the clamping bracket. When the clamping bracket rotates until the snap-fit ​​portion and the positioning portion are aligned, the snap-fit ​​portion snaps into the positioning portion and engages. The snap-fitting of the positioning portion and the snap-fit ​​portion is achieved through the structure of the slot and the bent section.

[0034] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A tape feeding mechanism of a sewing machine, comprising a tape feeding frame (1), a tape feeding roller (12), a pressing bracket (2) and a tape holding roller (25), wherein the tape feeding roller (12) is rotatably connected to the tape feeding frame (1), the tape holding roller (25) is rotatably connected to the pressing bracket (2), the pressing bracket (2) is hinged to the tape feeding frame (1) and presses the tape holding roller (25) tightly against the tape feeding roller (12), characterized in that: The tape feed frame (1) is provided with an elastic sheet (3), one end of the elastic sheet (3) is fixed on the tape feed frame (1), and the other end of the elastic sheet (3) is provided with a buckle portion (31). The pressing bracket (2) is provided with a positioning portion (23), and when the pressing bracket (2) rotates until the positioning portion (23) is buckled with the buckle portion (31), the tape pressing roller (25) is located away from the tape feed roller (12).

2. The tape feeding mechanism of a sewing machine according to claim 1, characterized in that: The buckle portion (31) is a bent section on the elastic sheet (3) that is bent toward the side of the pressing bracket (2); the positioning portion (23) is a convex portion on the pressing bracket (2) that protrudes toward the side of the elastic sheet (3); the end of the buckle portion (31) is located on the rotation track of the positioning portion (23); and the positioning portion (23) can be abutted and engaged with the buckle portion (31).

3. The tape feeding mechanism of a sewing machine according to claim 2, characterized in that: The positioning portion (23) is V-shaped and includes a push-off surface (231) and a supporting surface (232). The supporting surface (232) is parallel to the swing arm (22). The angle between the push-off surface (231) and the supporting surface (232) is an acute angle. When the belt pressing roller (25) is pressed tightly against the belt feeding roller (12), the push-off surface (231) faces the buckle portion (31). When the positioning portion (23) and the buckle portion (31) are buckled, the supporting surface (232) and the buckle portion (31) are in contact.

4. The tape feeding mechanism of a sewing machine according to claim 2, characterized in that: The elastic sheet (3) is further provided with a limiting portion (32) opposite to the buckle portion (31); the limiting portion (32) is a bent section on the elastic sheet (3) bent toward the side of the pressing bracket (2); a bayonet (33) is formed between the limiting portion (32) and the positioning portion (23); and the positioning portion (23) is located in the bayonet (33) when buckled with the buckle portion (31).

5. The tape feeding mechanism of a sewing machine according to claim 1, characterized in that: The snap-fit ​​portion (31) is a snap-fit ​​hole formed on the elastic sheet (3); the positioning portion (23) is a convex portion on the pressing bracket (2) that protrudes toward one side of the elastic sheet (3); the snap-fit ​​portion (31) is located on a rotation track of the positioning portion (23); and the positioning portion (23) can be snapped into the snap-fit ​​portion (31) for fastening.

6. The tape feeding mechanism of a sewing machine according to claim 1, characterized in that: The positioning portion (23) is a slot provided on the pressing bracket (2); the snap portion (31) is a bent section of the elastic sheet (3) bent toward one side of the pressing bracket (2); the end of the snap portion (31) is arranged upward; the snap portion (31) always abuts against the pressing bracket (2); and when the pressing bracket (2) rotates until the snap portion (31) is aligned with the positioning portion (23), the snap portion (31) snaps into the positioning portion (23) and snaps in.

7. The tape feeding mechanism of a sewing machine according to any one of claims 1 to 6, characterized in that: The pressing bracket (2) comprises a rotating shaft (21) rotatably connected to the tape feeding frame (1) and swing arms (22) located at both ends of the rotating shaft (21), one end of the two swing arms (22) is fixed to the rotating shaft (21), the tape holding roller (25) is rotatably connected between the other ends of the two swing arms (22), the elastic sheet (3) is located in front of the other end of one of the swing arms (22), and the positioning portion (23) is located at the end of the other end of the above-mentioned swing arm (22).

8. The tape feeding mechanism of a sewing machine according to any one of claims 1 to 6, characterized in that: The pressing bracket (2) comprises a rotating shaft (21) rotatably connected to the tape feeding frame (1) and swing arms (22) located at both ends of the rotating shaft (21), one end of the two swing arms (22) is fixed to the rotating shaft (21), the tape holding roller (25) is rotatably connected between the other ends of the two swing arms (22), the elastic sheet (3) is located on the outside of one of the swing arms (22), and the positioning portion (23) is located on the outer side wall of the above-mentioned swing arm (22).

9. The tape feeding mechanism of a sewing machine according to any one of claims 1 to 6, characterized in that: A pressing section (34) is provided at the end of the elastic sheet (3), and the pressing section (34) is bent toward a side away from the belt holding roller (25).

10. The tape feeding mechanism of a sewing machine according to any one of claims 1 to 6, characterized in that: The elastic sheet (3) is a metal spring sheet.

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