Stepping lockstitch sewing machine with adjustable tug

Abstract

The utility model relates to the technical field of sewing machines, in particular to a tug-adjustable stepping lockstitch sewing machine which comprises a lockstitch sewing machine body, a supporting arm is arranged on the outer wall of the lockstitch sewing machine body, a cloth dragging wheel is arranged at the lower end of the supporting arm, a pressing arm is rotatably connected to the lower end of the supporting arm, a stepping motor is arranged on the top of the supporting arm, and a pull rod is arranged on the top of the stepping motor. The left side of the belt is limited through the auxiliary wheel, contact friction between the belt and the interior of the supporting arm is prevented, the right side of the belt is adjusted and tensioned through the adjusting wheel, the belt is prevented from being damaged, the belt is prevented from being damaged, and the belt is prevented from being damaged. The belt is more stably connected with the driving belt wheel and the driven belt wheel, the cloth dragging wheel rotates more stably, the auxiliary wheel, the adjusting wheel and the driven belt wheel are supported by the shaft rod to rotate, the position of the adjusting wheel can be manually adjusted, and manual adjustment of tensioning of the belt is more practical and convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a step-by-step lockstitch sewing machine with adjustable tug wheels. Background Art

[0002] A flat-seam sewing machine is a machine that uses a sewing thread to form a seam on the sewing material, so that one or more layers of sewing materials are interwoven or sewn together. It is usually divided into two uses: thin materials and thick materials. The flat-seam sewing machine can sew fabrics such as cotton, linen, silk, wool, and synthetic fibers, and products such as leather, plastic, and paper. Thin materials are generally used for knitwear, underwear, shirts, uniforms, etc. Thick materials are generally used for various sportswear, jeans, fashion, coats, shoes and hats, leather goods, bags, etc.

[0003] At present, a mop wheel is installed on the flat-bed sewing machine. The mop wheel can keep the fabric stable and transport it forward so that the fabric will not be twisted or skewed during sewing, thereby ensuring the quality of sewing. The existing mop wheel is driven to rotate by a motor, a belt, and a pulley. When processing materials of different thicknesses, the wheel height needs to be adjusted, resulting in changes in the tension of the originally connected belt. If the belt is too tight, friction increases, affecting the rotation of the wheel. If the belt is too loose, it may cause the belt to fall off, affecting normal operation. Utility Model Content

[0004] The utility model aims to provide a step-by-step sewing machine with an adjustable tug wheel, so as to solve the problem in the above background technology that the existing tug wheel is driven to rotate by a motor, a belt and a pulley. When processing materials of different thicknesses, it is necessary to adjust the height of the wheel, resulting in a change in the tension of the originally connected belt. If the belt is too tight, the friction increases and the rotation of the wheel is affected. If the belt is too loose, it may cause the belt to fall off, affecting normal operation.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: comprising a flat sewing machine body, a support arm is arranged on the outer wall of the flat sewing machine body, a mopping wheel is arranged on the bottom end of the support arm, a pressing arm is rotatably connected to the bottom end of the support arm, a stepping motor is arranged on the top of the support arm, an output end of the stepping motor extends into the support arm and is connected to a driving pulley, a driven pulley connected to the mopping wheel is arranged inside the pressing arm, a belt is sleeved between the driven pulley and the driving pulley, a tensioning assembly is arranged between the support arm and the pressing arm, an auxiliary wheel fitted with the belt is arranged inside the support arm, a mounting frame is arranged inside the support arm, a wheel frame and a movable plate are slidably connected inside the mounting frame, an adjusting wheel fitted with the belt is arranged on one side of the wheel frame, and second springs are respectively arranged at the upper and lower ends between the wheel frame and the movable plate, a screw is threadedly connected to the outer wall of the support arm, one end of the screw extends into the support arm and is rotatably connected to one side of the movable plate.

[0006] Preferably, the tensioning assembly includes a telescopic rod, a rotating shaft, a first spring, and a screw. The upper end of the telescopic rod is rotatably connected to the support arm, the rotating shaft is arranged between the telescopic rod and the support arm, the bottom end of the telescopic rod is detachably connected to the pressing arm, and one end of the screw passes through the bottom end of the telescopic rod and is threadedly connected to the pressing arm.

[0007] Preferably, the outer wall of the support arm is provided with a spiral coil matching the screw rod, and the outer wall of the screw rod is threadedly connected in the spiral coil.

[0008] Preferably, support rods are provided on both sides of the inner wall of the support arm, and one end of the two support rods are respectively inserted into the inside of both sides of the pressing arm.

[0009] Preferably, the wheel frame is respectively provided with a first guide block at the upper and lower ends, and the movable plate is respectively provided with a second guide block at the upper and lower ends. A guide groove matching the first guide block and the second guide block is opened on the inner side of the mounting frame, and the first guide block and the second guide block are respectively inserted into the guide groove, and the first guide block and the second guide block are respectively fixedly connected to the two ends of the second spring.

[0010] Preferably, a rotating head is provided at one end of the screw rod, a rotating groove matching the rotating head is provided at one side of the movable plate, and one end of the rotating head is rotatably connected in the rotating groove.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The left side of the belt is limited by the auxiliary wheel to prevent the belt from contacting and rubbing with the inside of the support arm. The tension of the right side of the belt is adjusted by the adjusting wheel. The adjusting wheel is arranged on the wheel frame, and the wheel frame slides on the mounting frame. The second spring is arranged between the movable plate and the wheel frame. When the belt tension changes, the adjusting wheel stretches the belt through the stretching of the second spring. The tension of the belt after the adjustment change makes the belt more stably connected with the driving pulley and the driven pulley, so that the rotation of the mop wheel is more stable. The auxiliary wheel, the adjusting wheel, and the driven pulley in the utility model are respectively supported and rotated by the shaft rod;

[0013] 2. The screw is rotatably connected to the movable plate, and the rotatable screw drives the movable plate to move in parallel, driving the second spring to pull the wheel frame to move. The position of the adjusting wheel can be manually adjusted, and manually adjusting the tension of the belt is more practical and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a side view of the structure of the utility model;

[0016] Figure 3This is a schematic diagram of the side cross-sectional structure of the support arm of the utility model;

[0017] Figure 4 For this utility model Figure 3 A schematic diagram of the enlarged structure;

[0018] Figure 5 This is a schematic diagram of the front cross-sectional structure of the support arm of the utility model;

[0019] Figure 6 For this utility model Figure 5 Schematic diagram of the enlarged structure of B.

[0020] In the figure: 1. sewing machine body; 2. support arm; 21. auxiliary wheel; 3. stepping motor; 31. driving pulley; 4. tensioning assembly; 41. telescopic rod; 42. rotating shaft; 43. first spring; 44. screw; 5. pressing arm; 6. mopping wheel; 61. driven pulley; 8. belt; 9. spiral ring; 10. screw; 11. mounting frame; 12. wheel frame; 121. first guide block; 13. adjusting wheel; 14. moving plate; 141. second guide block; 15. second spring. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the implementation regulations described are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Example

[0023] See also Figure 1-6, in the figure: This embodiment is a preferred implementation of the technical solution, a tug wheel adjustable stepping sewing machine, including a sewing machine body 1, a support arm 2 is arranged on the outer wall of the sewing machine body 1, a mopping wheel 6 is arranged at the bottom of the support arm 2, a pressing arm 5 is rotatably connected to the bottom of the support arm 2, a stepping motor 3 is arranged on the top of the support arm 2, the output end of the stepping motor 3 extends into the support arm 2 and is connected to a driving pulley 31, a driven pulley 61 connected to the mopping wheel 6 is arranged inside the pressing arm 5, and a sleeve is arranged between the driven pulley 61 and the driving pulley 31 There is a belt 8, a tensioning assembly 4 is arranged between the support arm 2 and the pressing arm 5, an auxiliary wheel 21 which is in contact with the belt 8 is arranged inside the support arm 2, a mounting frame 11 is arranged inside the support arm 2, a wheel frame 12 and a movable plate 14 are slidably connected inside the mounting frame 11, an adjusting wheel 13 which is in contact with the belt 8 is arranged on one side of the wheel frame 12, and second springs 15 are respectively arranged at the upper and lower ends between the wheel frame 12 and the movable plate 14, a screw rod 10 is threadedly connected to the outer wall of the support arm 2, and one end of the screw rod 10 extends to the inside of the support arm 2 and is rotatably connected to one side of the movable plate 14.

[0024] like Figure 1 , 2 As shown, the tensioning assembly 4 includes a telescopic rod 41, a rotating shaft 42, a first spring 43, and a screw 44. The upper end of the telescopic rod 41 is rotatably connected to the support arm 2, and the rotating shaft 42 is arranged between the telescopic rod 41 and the support arm 2. The bottom end of the telescopic rod 41 is detachably connected to the pressing arm 5. One end of the screw 44 passes through the bottom end of the telescopic rod 41 and is threadedly connected to the pressing arm 5. The two ends of the telescopic rod 41 are respectively connected to the support arm 2 and the pressing arm 5. When the mop wheel 6 changes its upward position, the telescopic rod 41 is moved upward. The end is located on the support arm 2 and rotates, and the telescopic rod 41 is shortened at the same time, so that the first springs 43 located on the upper and lower ends of the telescopic rod 41 are squeezed together, and a baffle is set on the outer wall of the telescopic rod 41 to constrain the position of the first spring 43, so that the cloth under the mop wheel 6 is pressed and transported, and one end of the screw 44 is threadedly connected to the threaded hole at the beginning of the pressing arm 5 through the bottom end of the telescopic rod 41. Through the multiple threaded holes opened on the outer wall of the pressing arm 5, the height of the mop wheel 6 can be manually adjusted, which is better suitable for conveying cloths of different specifications.

[0025] like Figure 2 , 4 As shown, the outer wall of the support arm 2 is provided with a spiral coil 9 matching the screw rod 10 , and the outer wall of the screw rod 10 is threadedly connected in the spiral coil 9 . Through the spiral coil 9 provided on the outer wall of the support arm 2 , the screw rod 10 is threadedly connected to one side of the support arm 2 .

[0026] like Figure 6As shown, support rods are provided on both sides of the inner wall of the support arm 2, and one end of the two support rods are respectively inserted into the inside of both sides of the pressing arm 5. The two support rods are provided on the inner wall of the support arm 2, and the two support rods are inserted into the inside of both sides of the pressing arm 5, so as to support the pressing arm 5 to rotate at the bottom end of the support arm.

[0027] like Figure 2 , 3 As shown, the upper and lower ends of the wheel frame 12 are respectively provided with first guide blocks 121, and the upper and lower ends of the movable plate 14 are respectively provided with second guide blocks 141. A guide groove matching the first guide block 121 and the second guide block 141 is opened on the inner side of the mounting frame 11, and the first guide block 121 and the second guide block 141 are respectively inserted into the guide grooves, and the first guide block 121 and the second guide block 141 are respectively fixedly connected to the two ends of the second spring 15. The first guide blocks 121 provided at both ends of the wheel frame 12 and the second guide blocks 141 provided at both ends of the movable plate 14 are respectively inserted into the guide grooves opened in the mounting frame 11, so that the wheel frame 12 and the movable plate 14 are limited to move on the mounting frame 11, and the second spring 15 is connected between the first guide block 121 and the second guide block 141 for stretching the wheel frame 12.

[0028] like Figure 1 , 2 As shown, a rotating head is provided at one end of the screw rod 10, a rotating groove matching the rotating head is opened at one side of the moving plate 14, and one end of the rotating head is rotatably connected in the rotating groove.

[0029] In this embodiment, firstly, the various parts are installed, the pressing arm 5 is rotatably arranged at the bottom end of the supporting arm 2, and the tensioning assembly 4 is arranged between the pressing arm 5 and the supporting arm 2, so that the force of the cloth-pressing mopping wheel 6 at the bottom of the pressing arm 5 can be automatically adjusted, and the driving pulley 31 is driven to rotate by the stepping motor 3, and a driven pulley 61 is rotatably arranged inside the pressing arm 5, and the driven pulley 61 and the driving pulley 31 are driven by the belt 8 arranged between them to rotate the mopping wheel 6, so as to transport the sewing material;

[0030] When the material thickness changes, the pressing arm 5 is located at the bottom of the supporting arm 2 and rotates the tensioning assembly 4 to extend or retract the length, pressing and conveying the cloth. When the height of the mopping wheel 6 changes, the tension between the mopping wheel 6 and the belt 8 will change. The auxiliary wheel 21 is used to limit the left side of the belt 8 to prevent the belt 8 from contacting and rubbing with the inside of the supporting arm 2. The tension on the right side of the belt 8 is adjusted by the adjusting wheel 13. The adjusting wheel 13 is arranged on the wheel frame 12, and the wheel frame 12 is located on the mounting frame 11 and slides. The second spring 15 is provided between the moving plate 14 and the wheel frame 12. When the tension of the belt 8 changes, the adjusting wheel 13 is stretched by the second spring 15 to adjust the tension of the belt 8 after the change to prevent the belt 8 from being loosened or over-tightened. The auxiliary wheel 21, the adjusting wheel 13, and the driven pulley 61 in the utility model are respectively supported and rotated by the shaft rod;

[0031] The screw rod 10 is rotatably connected to the movable plate 14, and the rotatable screw rod 10 drives the movable plate 14 to move in parallel, driving the second spring 15 to pull the wheel frame 12 to move, and the position of the adjusting wheel 13 can be manually adjusted, and manually adjusting the tension of the belt 8 is more practical and convenient.

[0032] The above content is a further detailed description of the utility model in combination with specific implementation methods. It cannot be determined that the specific implementation of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, without departing from the concept of the utility model, they can also make some simple deductions or substitutions, which should be regarded as belonging to the scope of protection determined by the claims submitted for the utility model.

Claims

1. A pull-wheel adjustable stepping lockstitch sewing machine, comprising a lockstitch sewing machine body (1), the outer wall of the lockstitch sewing machine body (1) is provided with a support arm (2), the bottom end of the support arm (2) is provided with a cloth-pulling wheel (6), the bottom end of the support arm (2) is rotatably connected with a pressing arm (5), a stepping motor (3) is provided at the top of the support arm (2), the output end of the stepping motor (3) extends into the support arm (2) and is connected with a driving pulley (31), a driven pulley (61) connected with the cloth-pulling wheel (6) is provided inside the pressing arm (5), a belt (8) is sleeved between the driven pulley (61) and the driving pulley (31), and the characteristics are: A tensioning assembly (4) is arranged between the support arm (2) and the pressing arm (5); an auxiliary wheel (21) which is in contact with the belt (8) is arranged inside the support arm (2); a mounting frame (11) is arranged inside the support arm (2); a wheel frame (12) and a movable plate (14) are slidably connected inside the mounting frame (11); an adjusting wheel (13) which is in contact with the belt (8) is arranged on one side of the wheel frame (12); a second spring (15) is arranged at the upper and lower ends between the wheel frame (12) and the movable plate (14), respectively; a screw rod (10) is threadedly connected to the outer wall of the support arm (2); one end of the screw rod (10) extends into the interior of the support arm (2) and is rotatably connected to one side of the movable plate (14).

2. The step-by-step lockstitch sewing machine with adjustable tug wheel according to claim 1, characterized in that: The tensioning assembly (4) comprises a telescopic rod (41), a rotating shaft (42), a first spring (43), and a screw (44); the upper end of the telescopic rod (41) is rotatably connected to the support arm (2); the rotating shaft (42) is arranged between the telescopic rod (41) and the support arm (2); the lower end of the telescopic rod (41) is detachably connected to the pressing arm (5); one end of the screw (44) passes through the lower end of the telescopic rod (41) and is threadedly connected to the pressing arm (5).

3. The step-by-step lockstitch sewing machine with adjustable tug wheel according to claim 1, characterized in that: The outer wall of the support arm (2) is provided with a spiral coil (9) matching the screw rod (10), and the outer wall of the screw rod (10) is threadedly connected in the spiral coil (9).

4. The step-by-step lockstitch sewing machine with adjustable pulley according to claim 1, characterized in that: Support rods are provided on both sides of the inner wall of the support arm (2), and one end of the two support rods is respectively inserted into the inside of both sides of the pressing arm (5).

5. The step-by-step lockstitch sewing machine with adjustable tug wheel according to claim 1, characterized in that: The wheel frame (12) is provided with first guide blocks (121) at the upper and lower ends respectively, and the movable plate (14) is provided with second guide blocks (141) at the upper and lower ends respectively. A guide groove matching the first guide block (121) and the second guide block (141) is provided on the inner side of the mounting frame (11), and the first guide block (121) and the second guide block (141) are respectively inserted into the guide grooves. The first guide block (121) and the second guide block (141) are respectively fixedly connected to the two ends of the second spring (15).

6. The puller-adjustable step-by-step lockstitch sewing machine according to claim 1, characterized in that: A rotating head is arranged at one end of the screw rod (10), a rotating groove matching the rotating head is opened on one side of the movable plate (14), and one end of the rotating head is rotatably connected in the rotating groove.

Images