Positioning device for center sewing machine

Abstract

According to the technical scheme, the positioning device for the center sewing machine is characterized in that the positioning device comprises a shell, the shell is fixedly connected with an installation frame, the installation frame is provided with a positioning assembly, the positioning assembly comprises an upper positioning frame, and the shell further abuts against a containing box arranged below the upper positioning frame; the side, facing the upper positioning frame, of the containing box is fixedly connected with a lower positioning frame, the containing box is further provided with a moving assembly arranged in the shell, the side, facing the lower positioning frame, of the upper positioning frame is fixedly connected with a positioning piece, and the side, facing the upper positioning frame, of the lower positioning frame is provided with a positioning groove used for containing the positioning piece. The upper positioning frame and the lower positioning frame abut against each other to position the sewing position of cloth, wrong places are prevented from being sewn during sewing operation, certain protection can be formed for the sewing operation, the mounting frame and the placing box can be used for customizing signals and placing positions of the center sewing machine, and the sewing machine is convenient to use. Therefore, the utility model can be applied to more application scenes.

Description

Technical Field

[0001] This utility model relates to a positioning device for a center seam sewing machine. Background Technology

[0002] A center-seam sewing machine typically refers to a sewing machine specifically designed for joining fabric pieces. Its common use is to join two pieces of fabric together. When using a home center-seam sewing machine, the two pieces of fabric are pushed simultaneously by hand, and the machine is started using the foot. This method is only suitable for joining short pieces of fabric. If the fabric is long, it tends to pile up, resulting in uneven seams and wrinkles, leading to poor stitch quality. In existing industrial center-seam sewing machines, rollers are typically used to pre-flatten the fabric and keep it taut to prevent folding. This results in the fabric spreading out, making the entire machine bulky and requiring significant factory space, increasing production costs. It is also unsuitable for small workshops or home use. Therefore, a positioning device for center-seam sewing machines is needed. This device can keep the fabric taut at the seam, thereby reducing the overall size of the machine.

[0003] For the reasons mentioned above, how to keep the fabric taut at the seams is the problem that this application addresses. Utility Model Content

[0004] To address the shortcomings of existing technologies, a positioning device for a center-seam sewing machine is provided. This device can tighten the fabric at the sewing point, thereby reducing the overall size of the device.

[0005] To achieve the above objectives, the following technical solution is provided: a positioning device for a center seam sewing machine, comprising a housing, a mounting frame fixedly connected to the housing, a positioning component mounted on the mounting frame, the positioning component comprising an upper positioning frame, the housing further abutting against a placement box located below the upper positioning frame, a lower positioning frame fixedly connected to the side of the placement box facing the upper positioning frame, a movable component installed in the placement box within the housing, a positioning piece fixedly connected to the side of the upper positioning frame facing the lower positioning frame, and a positioning groove for accommodating the positioning piece provided on the side of the lower positioning frame facing the upper positioning frame.

[0006] In summary, the above technical solution has the following beneficial effects: Since the models of sewing machines used in homes or small workshops are not fixed, and the types of fabrics and sewing methods will change at any time according to needs, it is not suitable to design the positioning device in a fixed style.

[0007] During sewing, the first problem to solve is that the fabric to be sewn needs to be flat, especially at the sewing area, to prevent wrinkles from forming and causing poor sewing quality. The upper and lower positioning frames can be used to fix the fabric in place. This can prevent the fabric from moving during sewing and prevent surrounding debris from affecting the sewing process. Furthermore, the insertion of the positioning piece and the positioning slot can be used to determine whether the abutment is normal, preventing the upper and lower positioning frames from being misaligned and causing the fabric to fail to be positioned.

[0008] In addition, the fabric can be set parallel to the top of the unraised lower positioning frame. When the moving component raises the lower positioning frame, the sewing part of the fabric will be lifted. Since the length of the fabric is fixed at this time, it will be stretched to a certain length when it is lifted due to tilting, so that the fabric can be taut, further reducing the possibility of wrinkles. The degree of tautness can be adjusted by adjusting the extension position of the fabric.

[0009] Since center-sewing machines typically use downward-facing sewing needles for sewing, a mounting bracket is used on the top of the housing to install positioning components to prevent obstruction of the sewing needles. Because the type of fabric and sewing method can change at any time according to needs, a storage box is provided to install matching sewing bases to meet the needs of different sewing operations.

[0010] This invention positions the fabric for sewing by setting the upper and lower positioning frames to abut each other, preventing sewing in the wrong place during the sewing process and providing some protection for the sewing operation. The mounting frame and placement box can be used to customize the signal and placement position of the sewing machine, making this invention applicable to more usage scenarios. Attached Figure Description

[0011] Figure 1 A three-dimensional structural schematic diagram of a positioning device for a center-sewing machine;

[0012] Figure 2 This is a side sectional view of the motor in this utility model;

[0013] Figure 3 This is a front sectional view of the sector gear in this utility model;

[0014] Figure 4 This is a side cross-sectional view of the synchronous belt in this utility model.

[0015] Reference numerals: 1. Housing; 2. Mounting bracket; 3. Positioning component; 4. Moving component;

[0016] 11. Placement box; 12. Lower positioning frame; 13. Positioning slot; 14. Motor; 15. Electrical control components; 16. Button; 17. Display screen;

[0017] 141. First drive shaft; 142. Sector gear; 143. First bevel gear; 144. Second bevel gear; 145. Third drive shaft; 146. Second synchronous pulley; 147. Synchronous belt;

[0018] 21. Second drive shaft; 22. Retractable wheel; 23. Protective plate; 24. First synchronous pulley;

[0019] 31. Upper positioning frame; 32. Positioning piece; 33. Spring; 34. Protective sleeve;

[0020] 41. First rack; 42. Second rack. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0022] Reference Figure 1-4 As shown, a positioning device for a center seam sewing machine includes a housing 1, a mounting frame 2 fixedly connected to the housing 1, a positioning component 3 mounted on the mounting frame 2, the positioning component 3 including an upper positioning frame 31, the housing 1 also abutting against a placement box 11 located below the upper positioning frame 31, a lower positioning frame 12 fixedly connected to the side of the placement box 11 facing the upper positioning frame 31, a moving component 4 installed in the placement box 11, a positioning piece 32 fixedly connected to the side of the upper positioning frame 31 facing the lower positioning frame 12, and a positioning groove 13 for accommodating the positioning piece 32 provided on the side of the lower positioning frame 12 facing the upper positioning frame 31;

[0023] Since the models of center-seam machines used in homes or small workshops are not fixed, and the types of fabrics and sewing methods change at any time according to needs, it is not suitable to design the positioning device in a fixed style.

[0024] During sewing, the first problem to solve is that the fabric to be sewn needs to be flat, especially at the sewing area, to prevent wrinkles from forming and resulting in poor sewing quality. The abutment of the upper positioning frame 31 and the lower positioning frame 12 can fix the fabric in part. This can prevent the fabric from moving during sewing and prevent surrounding debris from affecting the sewing process. Furthermore, the insertion of the positioning piece 32 and the positioning groove 13 can determine whether the abutment is normal, preventing the upper positioning frame 31 and the lower positioning frame 12 from being misaligned and causing the fabric to fail to be positioned.

[0025] In addition, the fabric can be set parallel to the top of the unraised lower positioning frame 12. When the moving component 4 drives the lower positioning frame 12 to rise, the sewing part of the fabric will be lifted. Since the length of the fabric is fixed at this time, it will be stretched to a certain length when it is lifted due to tilting, so that the fabric can be taut, further reducing the possibility of wrinkles. The degree of tautness can be adjusted by adjusting the extension position of the fabric.

[0026] Since the center-sewing machine usually performs sewing operations by using a sewing needle positioned downwards, a mounting bracket 2 is used on the top of the housing 1 to install the positioning component 3 to prevent obstruction of the sewing needle. Since the type of fabric and sewing method can change at any time according to the needs, a placement box 11 is provided to install the matching sewing base in order to meet the needs of different sewing operations.

[0027] This invention positions the fabric for sewing by abutting the upper positioning frame 31 and the lower positioning frame 12, preventing incorrect sewing during the sewing process and providing some protection for the sewing operation. The mounting frame 2 and the placement box 11 can be used to customize the signal and placement position of the sewing machine, making this invention applicable to more usage scenarios.

[0028] Furthermore, the moving component 4 includes a first rack 41 and a second rack 42 that are slidably connected to the housing 1 and fixedly connected to the bottom of the placement box 11. The first rack 41 and the second rack 42 are symmetrically arranged. A motor 14 is also fixedly connected inside the housing 1. The motor 14 is connected to a first transmission shaft 141 that is rotatably connected to the housing 1. The first transmission shaft 141 is fixedly connected to a sector gear 142 that meshes with both the first rack 41 and the second rack 42. The central angle of the sector gear 142 is 180°.

[0029] Since the size of this utility model needs to be as close as possible to the use scenario of home or small workshop, the size should not be too large. Therefore, the motor 14 adopts a simple unidirectional motor 14, and the sector gear 142 will only mesh with the first rack 41 or the second rack 42 at the same time, and cannot mesh with the first rack 41 and the second rack 42 at the same time. Furthermore, since the central angle of the sector gear 142 is 180°, after the sector gear 142 disengages from the first rack 41 or the second rack 42, it will immediately mesh with the other rack, thereby preventing the sector gear 142 from failing to play a supporting role.

[0030] Depend on Figure 3It can be seen that when the sector gear 142 rotates clockwise continuously, the sector gear 142 drives the first rack 41 to move upward by only meshing with the first rack 41, so that the lower positioning frame 12 can move toward the upper positioning frame 31. After the sector gear 142 continues to rotate clockwise, the sector gear 142 will disengage from the first rack 41 and mesh with the second rack 42. At this time, the sector gear 142 drives the second rack 42 to move downward, so that the lower positioning frame 12 can move away from the upper positioning frame 31. Thus, the movement of the lower positioning frame 12 is cycled.

[0031] Furthermore, the mounting bracket 2 is also rotatably connected to a second drive shaft 21, and the second drive shaft 21 is fixedly connected to a storage wheel 22 for storing fabric;

[0032] The horizontal position of the rotation center of the second drive shaft 21 is lower than the horizontal position of the top of the lower positioning frame 12;

[0033] Both ends of the storage wheel 22 are fixedly connected with protective plates 23 to prevent the fabric from rubbing against the mounting frame 2;

[0034] The second drive shaft 21 is also fixedly connected to a first synchronous pulley 24 located in the mounting bracket 2. The first drive shaft 141 is also fixedly connected to a first bevel gear 143. The first bevel gear 143 is meshed with a second bevel gear 144. The second bevel gear 144 is fixedly connected to a third drive shaft 145 that is rotatably connected to the housing 1. The third drive shaft 145 is fixedly connected to a second synchronous pulley 146. The second synchronous pulley 146 is connected to a synchronous belt 147 that is connected to the first synchronous pulley 24.

[0035] When piecing together long pieces of fabric, if the fabric piles up on the device, it will affect subsequent sewing operations. Therefore, a storage wheel 22 is needed to store the sewn fabric. Similarly, after the fabric is rolled up, a protective plate 23 is provided to protect the sides of the fabric in order to prevent the fabric from being damaged by friction with the mounting frame 2. The horizontal position of the rotation center of the second drive shaft 21 is set lower than the horizontal position of the top of the lower positioning frame 12 so as to facilitate the adjustment of the tilt angle of the fabric and also to adjust the tension by adjusting the initial position of the fabric.

[0036] In addition, to prevent the fabric from being stored in a timely manner, a transmission system is set up so that when the motor 14 drives the first transmission shaft 141 to rotate, it sequentially drives the storage wheel 22 to rotate through the first bevel gear 143, the second bevel gear 144, the third transmission shaft 145, the second synchronous pulley 146, the synchronous belt 147, the first synchronous pulley 24, and the second transmission shaft 21, thereby synchronizing the rotation of the storage wheel 22 with the movement of the lower positioning frame 12.

[0037] Furthermore, an electronic control component 15 for controlling the motor 14 is also installed inside the housing 1. The electronic control component 15 is electrically connected to a button 16 and a display screen 17 located on the surface of the housing 1.

[0038] Furthermore, the upper positioning frame 31 is also fixedly connected to a spring 33 that is fixedly connected to the mounting bracket 2 and a protective sleeve 34 that is sleeved on the spring 33. Since the upper positioning frame 31 and the lower positioning frame 12 will generate a certain degree of vibration when they come into contact, the spring 33 is set as a buffer to prevent the vibration from damaging the mounting bracket 2.

[0039] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A positioning device for a center seam sewing machine, characterized in that, The device includes a housing (1), a mounting bracket (2) fixedly connected to the housing (1), a positioning component (3) mounted on the mounting bracket (2), the positioning component (3) including an upper positioning frame (31), the housing (1) also abutting against a placement box (11) located below the upper positioning frame (31), a lower positioning frame (12) fixedly connected to the side of the placement box (11) facing the upper positioning frame (31), a moving component (4) installed in the housing (1), a positioning piece (32) fixedly connected to the side of the upper positioning frame (31) facing the lower positioning frame (12), and a positioning groove (13) for accommodating the positioning piece (32) provided on the side of the lower positioning frame (12) facing the upper positioning frame (31).

2. The positioning device for a center seam sewing machine according to claim 1, characterized in that, The moving component (4) includes a first rack (41) and a second rack (42) that are slidably connected to the housing (1) and fixedly connected to the bottom of the placement box (11). The first rack (41) and the second rack (42) are symmetrically arranged. A motor (14) is also fixedly connected inside the housing (1). The motor (14) is connected to a first transmission shaft (141) that is rotatably connected to the housing (1). The first transmission shaft (141) is fixedly connected to a sector gear (142) that meshes with both the first rack (41) and the second rack (42). The central angle of the sector gear (142) is 180°.

3. The positioning device for a center seam sewing machine according to claim 2, characterized in that, The mounting bracket (2) is also rotatably connected to a second drive shaft (21), and the second drive shaft (21) is fixedly connected to a storage wheel (22) for storing fabric.

4. A positioning device for a center seam sewing machine according to claim 3, characterized in that, The horizontal position of the rotation center of the second drive shaft (21) is lower than the horizontal position of the top of the lower positioning frame (12).

5. A positioning device for a center seam sewing machine according to claim 3, characterized in that, Both ends of the storage wheel (22) are fixedly connected with protective plates (23) to prevent the fabric from rubbing against the mounting frame (2).

6. A positioning device for a center seam sewing machine according to claim 3, characterized in that, The second drive shaft (21) is also fixedly connected to a first synchronous pulley (24) located in the mounting bracket (2). The first drive shaft (141) is also fixedly connected to a first bevel gear (143). The first bevel gear (143) is meshed with a second bevel gear (144). The second bevel gear (144) is fixedly connected to a third drive shaft (145) rotatably connected to the housing (1). The third drive shaft (145) is fixedly connected to a second synchronous pulley (146). The second synchronous pulley (146) is connected to a synchronous belt (147) connected to the first synchronous pulley (24).

7. A positioning device for a center seam sewing machine according to claim 1, characterized in that, The housing (1) is also equipped with an electronic control component (15) for controlling the motor (14), and the electronic control component (15) is electrically connected to a button (16) and a display screen (17) on the surface of the housing (1).

8. A positioning device for a center seam sewing machine according to claim 1, characterized in that, The upper positioning frame (31) is also fixedly connected to a spring (33) that is fixedly connected to the mounting bracket (2) and a protective sleeve (34) fitted onto the spring (33).

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