Sewing machine rubber band holder

Abstract

This utility model belongs to the technical field of sewing machine accessories, specifically referring to a sewing machine elastic band holder; it includes a fixed frame and a front support and a rear support located at both ends of the fixed frame. Rollers are provided on the front and rear supports. Each roller includes a hollow tube, a bearing, and a mounting shaft. Enlarged holes are provided at both ends of the inner hole of the hollow tube, forming a first step surface and a second step surface between the enlarged holes and the two ends of the inner hole, respectively. Several axially arranged protrusions are distributed circumferentially on the wall of each enlarged hole. The bearing is located within the enlarged hole, and its outer ring is tightly fitted to the protrusions. The mounting shaft passes through both bearings. A limiter is provided at one end of the mounting shaft, and the other end is connected to the front or rear support via a connecting assembly. This utility model provides protrusions on the inner wall of the enlarged holes. Through the interference fit between the protrusions and the outer ring of the bearing, even if the connecting assembly becomes loose, it can effectively prevent the bearing from coming out of the enlarged hole of the hollow tube, ensuring the normal delivery of the elastic band.

Description

Technical fields:

[0001] This utility model belongs to the technical field of sewing machine accessories, and specifically refers to a sewing machine elastic band holder. Background technology:

[0002] A sewing machine elastic band holder is an auxiliary device used to evenly stretch and transport elastic bands during the sewing process. It is mainly used in the elastic band sewing process of clothing (such as underwear, sportswear, socks, etc.) or home textiles (such as elastic fitted sheets, drawstring pants, etc.).

[0003] Existing rollers typically consist of a hollow tube, a bearing, and a screw. The specific structure is as follows: enlarged holes are machined at both ends of the hollow tube, the bearing is assembled into the enlarged holes, and the screw passes through mounting holes on the bearing and bracket, then is secured with a nut. However, this design has the following problem: because the bearing and the enlarged hole are connected in a movable manner, when machine vibration causes the nut to loosen, the screw may shift axially, causing the bearing to dislodge from the enlarged hole in the hollow tube. This situation will cause abnormal rotation of the hollow tube, affecting the normal delivery of the elastic band, and ultimately leading to the interruption of sewing operations. Summary of the Invention:

[0004] The purpose of this invention is to provide a sewing machine elastic band holder in which the protrusions at both ends of the hollow tube of the bearing and the roller are tightly fitted together to prevent abnormal rotation of the hollow tube due to the bearing coming off.

[0005] This utility model is implemented as follows:

[0006] A sewing machine elastic band holder includes a fixed frame fixed to the sewing machine table and a front support and a rear support located at both ends of the fixed frame. Rollers for spreading and conveying elastic bands are provided on the front support and the rear support. Each roller includes a hollow tube, a bearing, and a mounting shaft. The inner hole of the hollow tube has enlarged holes at both ends. A first step surface and a second step surface are formed between the enlarged holes and the two ends of the inner hole, respectively. Several axially arranged protrusions are distributed circumferentially on the hole wall of each enlarged hole. The bearing is disposed in the enlarged hole, and the outer ring of the bearing is tightly fitted to the protrusions. The mounting shaft passes through the two bearings. A limit member is provided at one end of the mounting shaft, and the other end is connected to the front support or the rear support through a connecting assembly.

[0007] In the above-mentioned sewing machine elastic band holder, the rear support has two parts, including a first rear support and a second rear support. The lower end of the first rear support is set on the fixed frame, and the upper end is suspended and provided with a first strip hole.

[0008] The second rear support includes a first support rod and a second support rod. The lower end of the first support rod is mounted on the fixed frame, and the upper end is suspended. A second strip-shaped hole is provided at the upper end of the first support rod. One end of the second support rod is connected to the second strip-shaped hole of the first support rod by a fastener, and the other end is suspended. A third strip-shaped hole is provided at the other end.

[0009] In the above-mentioned sewing machine elastic band holder, a front support is provided, the lower end of the front support is set on the fixed frame, and the other end is suspended and provided with a fourth strip hole.

[0010] In the above-mentioned sewing machine elastic band holder, the limiting member is a retaining spring; or the mounting shaft is a screw with a head, the head being a limiting member.

[0011] In the above-mentioned sewing machine elastic band holder, the other end of the mounting shaft is a screw part, and the connecting assembly includes a connector and a nut. The connector has a threaded hole that is screwed into the screw part, and the connector also has a protrusion that can be locked in the corresponding strip hole to limit the rotation of the connector.

[0012] In the above-mentioned sewing machine elastic band holder, the fixing frame includes a strip-shaped base, and the two ends of the base are bent twice to form a first mounting part and a second mounting part. The first mounting part and the second mounting part are spaced apart from the base. The front bracket is mounted on the first mounting part and the rear bracket is mounted on the second mounting part.

[0013] In the above-mentioned sewing machine elastic band holder, a limit retaining ring is fitted on the outer cylindrical surface of the roller, and the limit retaining ring is detachably fixed to the roller by fasteners.

[0014] In the above-mentioned sewing machine elastic band holder, the hollow tube is a plastic tube.

[0015] The outstanding advantages of this utility model compared to the prior art are:

[0016] This invention features a raised strip on the inner wall of the enlarged hole, forming a multi-directional contact point between the bearing outer ring and the enlarged hole. Through the interference fit between the raised strip and the bearing outer ring, even if the connecting components become loose, the bearing can be effectively prevented from coming out of the enlarged hole of the hollow tube, ensuring the normal delivery of the elastic band and the orderly progress of the sewing operation. Attached image description:

[0017] Figure 1 This is a schematic diagram of the utility model after installation;

[0018] Figure 2 This is a schematic diagram of the hollow tube of this utility model;

[0019] Figure 3 This is a schematic diagram of a hollow tube of this utility model with a bearing installed at one end;

[0020] Figure 4 This is a schematic diagram of the mounting shaft of this utility model with a locking component.

[0021] Figure 5 This is a schematic diagram of the locking component of this utility model.

[0022] In the diagram: 1. Sewing machine table; 2. Fixing frame; 3. Front support; 4. Elastic band; 5. Roller; 6. Hollow tube; 7. Bearing; 8. Mounting shaft; 9. Inner hole; 10. Enlarged hole; 11. First stepped surface; 12. Raised bar; 13. Limiting component; 14. Connecting component; 15. First rear support; 16. First strip hole; 17. First support rod; 18. Second support rod; 19. Second strip hole; 20. Fourth strip hole; 21. Threaded hole; 22. Protrusion; 23. Limiting retaining ring. Detailed implementation method:

[0023] The present invention will be further described below with reference to specific embodiments. See also: Figure 1-5 :

[0024] This utility model provides a sewing machine elastic band holder, which includes a fixed frame 2 fixed on the sewing machine table 1 and a front support 3 and a rear support located at both ends of the fixed frame 2. Rollers 5 are provided on the front support 3 and the rear support to spread and convey the elastic bands 4. The roller 5 includes a hollow tube 6, bearings 7, and a mounting shaft 8. Enlarged holes 10 are provided at both ends of the inner hole 9 of the hollow tube 6. A first stepped surface 11 and a second stepped surface are formed between the enlarged holes 10 and the two ends of the inner hole 9, respectively. Several axially arranged protrusions 12 are distributed circumferentially on the wall of each enlarged hole 10. Generally, the protrusions 12 are evenly distributed circumferentially. The bearings 7 are disposed within the enlarged holes 10, and the outer ring of the bearings 7 is tightly fitted to the protrusions 12. The mounting shaft 8 passes through the two bearings 7. A limiting member 13 is provided at one end of the mounting shaft 8, and the other end is connected to the front support 3 or the rear support via a connecting assembly.

[0025] This invention provides a protrusion 12 on the inner wall of the enlarged hole 10, and the outer ring of the bearing 7 forms a multi-directional contact point with the enlarged hole 10. Through the interference fit between the protrusion 12 and the outer ring of the bearing 7, even if the connecting components become loose, the bearing can be effectively prevented from coming out of the enlarged hole of the hollow tube, ensuring the normal delivery of the elastic band and the orderly progress of the sewing operation.

[0026] It should be noted that the rear bracket of this utility model has two parts, including a first rear bracket 15 and a second rear bracket. The lower end of the first rear bracket 15 is set on the fixed frame 2, and the upper end is suspended and provided with a first strip hole 16.

[0027] The second rear support includes a first support rod 17 and a second support rod 18. The lower end of the first support rod 17 is mounted on the fixed frame 2 and the upper end is suspended. A second strip hole 19 is provided at the upper end of the first support rod 17. One end of the second support rod 18 is connected to the second strip hole 19 of the first support rod 17 by a fastener, and the other end is suspended. A third strip hole is provided at the other end.

[0028] By adjusting the angle between the second support rod 18 and the first support rod 17, as well as the vertical position of the second support rod 18 on the first support rod 17, the position of the roller 5 connected to the second support rod 18 can be adjusted, ultimately achieving the purpose of tensioning the elastic band 4. A gear structure can be installed between the second support rod 18 and the first support rod 17 to make the connection between the second support rod 18 and the first support rod 17 more stable.

[0029] The lower ends of the first rear bracket 15 and the first support rod 17 can be set in an L-shape to facilitate fixing them to the fixed frame 2 with fasteners; or an L-shaped bracket can be set on the fixed frame 2 to fix the lower ends of the first rear bracket 15 and the first support rod 17 to the L-shaped bracket with fasteners.

[0030] In addition, the present invention has a front bracket 3, the lower end of which is mounted on the fixed frame 2, and the other end is suspended and has a fourth strip hole 20.

[0031] The first strip hole 16, the third strip hole, and the fourth strip hole 20 of this utility model are used to connect with the roller 5 and to adjust the position of the corresponding roller 5 on the front bracket 3, the first rear bracket 15, and the second support rod 18.

[0032] Specifically, the other end of the mounting shaft 8 is a screw section. The connecting assembly includes a connector 14 and a nut. The connector 14 has a threaded hole 21 that screws into the screw section. The connector 14 also has a protrusion 22 that can be engaged in the corresponding slotted hole to restrict the rotation of the connector 14. After the screw section passes through the corresponding bracket, a nut is screwed onto its outer end to install the roller 5. The protrusion 22 of the connector 14 engages in the slotted hole of the bracket, directly preventing the connector 14 (along with the screw section) from rotating, thereby preventing the nut from loosening due to the rotation of the roller and improving the reliability of long-term use.

[0033] In this embodiment, the limiting member 13 is a snap ring; alternatively, the mounting shaft 8 can be a screw with a head, in which case the head is the limiting member 13. In use, one end face of the locking member 14 abuts against the corresponding bearing. Axial positioning of the two bearings 7 is achieved through the limiting member 13, the connecting member 14, the nut, and the first and second stepped surfaces 11 and 12.

[0034] The fixing frame 2 of this utility model includes a strip-shaped base, with a first mounting part and a second mounting part formed by bending the base twice at both ends. The first mounting part and the second mounting part are spaced apart from the base. The front support 3 is mounted on the first mounting part, and the rear support is mounted on the second mounting part. This arrangement of the fixing frame 2 avoids the sewing machine while still allowing connection to the sewing machine table 1 without elevating the sewing machine.

[0035] To prevent the elastic band 4 from shifting along the axis of the roller 5 during transmission, a limiting retaining ring 23 is fitted onto the outer cylindrical surface of the roller 5. The limiting retaining ring 23 is detachably fixed to the roller 5 by fasteners. In this embodiment, the hollow tube 6 of the roller 5 is made of plastic injection molding, and the raised strip 12 is also formed together.

[0036] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A sewing machine elastic band holder, comprising a fixed frame (2) fixed on a sewing machine table (1) and a front support (3) and a rear support located at both ends of the fixed frame (2), wherein rollers (5) for spreading and conveying elastic bands (4) are provided on the front support (3) and the rear support, characterized in that: The roller (5) includes a hollow tube (6), a bearing (7) and a mounting shaft (8). The inner hole (9) of the hollow tube (6) is provided with enlarged holes (10) at both ends. The enlarged holes (10) and the inner hole (9) form a first step surface (11) and a second step surface, respectively. Several axially arranged protrusions (12) are distributed circumferentially on the hole wall of each enlarged hole (10). The bearing (7) is set in the enlarged hole (10). The outer ring of the bearing (7) is tightly connected to the protrusions (12). The mounting shaft (8) passes through the two bearings (7). A limit piece (13) is provided at one end of the mounting shaft (8), and the other end is connected to the front bracket (3) or the rear bracket through a connecting assembly.

2. The sewing machine elastic band holder according to claim 1, characterized in that: The rear support has two parts, including a first rear support (15) and a second rear support. The lower end of the first rear support (15) is set on the fixed frame (2), and the upper end is suspended and provided with a first strip hole (16). The second rear support includes a first support rod (17) and a second support rod (18). The lower end of the first support rod (17) is mounted on the fixed frame (2), and the upper end is suspended. A second strip hole (19) is provided at the upper end of the first support rod (17). One end of the second support rod (18) is connected to the second strip hole of the first support rod (17) by a fastener, and the other end is suspended. A third strip hole is provided at the other end.

3. A sewing machine elastic band holder according to claim 2, characterized in that: The front bracket (3) is provided, with the lower end of the front bracket (3) set on the fixed frame (2), and the other end suspended and provided with a fourth strip hole (20).

4. A sewing machine elastic band holder according to claim 1, 2, or 3, characterized in that: The limiting member (13) is a snap ring; or the mounting shaft (8) is a screw with a head, the head being the limiting member (13).

5. A sewing machine elastic band holder according to claim 2, characterized in that: The other end of the mounting shaft (8) is a screw part. The connecting assembly includes a connector (14) and a nut. The connector (14) has a threaded hole that is screwed into the screw part. The connector (14) also has a protrusion (22) that can be locked in the corresponding slot to limit the rotation of the connector (14).

6. A sewing machine elastic band holder according to claim 1, characterized in that: The fixing frame (2) includes a strip-shaped base, and the two ends of the base are bent twice to form a first mounting part and a second mounting part. The first mounting part and the second mounting part are spaced apart from the base. The front bracket (3) is set on the first mounting part and the rear bracket is set on the second mounting part.

7. A sewing machine elastic band holder according to claim 1, characterized in that: A limiting ring (23) is fitted on the outer cylindrical surface of the roller (5), and the limiting ring (23) is detachably fixed on the roller (5) by fasteners.

8. A sewing machine elastic band holder according to claim 1, 2, 3, 6, or 7, characterized in that: The hollow tube (6) is a plastic tube.

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