Thread stand structure for bag sewing machine with backstitching and back stitching functions

Abstract

The utility model discloses a thread stand structure for a bag sewing machine with backstitching and back stitching functions, and belongs to the technical field of bag sewing machines. Comprising a fixing table and a supporting rod, and the supporting rod is fixedly connected to the rear end of the upper side of the fixing table. The device has the advantages that the abutting plate is rotated to be vertically upward, the outer end of the sleeve rod is sleeved with the bobbin, then the sleeve rod is rotated to enable the outer side, located on the first threaded rod, of the sleeve rod to move downwards, meanwhile, the fixing ring moves downwards to push the abutting plate outwards, and after the abutting plate is rotated to the position where the upper end of the abutting plate abuts against the inner side of the bobbin, the pressing ring on the outer side of the sleeve rod is rotated; the thread guiding ring is arranged on the tray, so that the thread guiding ring is moved to the upper end of the bobbin, the bobbin on the tray is fixed between the tray and the pressing ring, then a part of the thread at the outer end of the bobbin is pulled out to penetrate through the thread guiding ring and then is connected into the bag sewing machine for use, and after the bobbin is fixed in the installation mode, the thread at the outer end of the bobbin can be pulled upwards; when the bobbin is subjected to upward dragging force, the bobbin is blocked by the pressing ring and cannot be separated from the upper end of the tray.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, specifically to a thread frame structure for a sewing machine with a backstitch function. Background Technology

[0002] A bag sewing machine is a device designed for sewing the openings of plastic woven bags, paper bags, paper-plastic composite bags, aluminum-coated paper bags, etc. It primarily performs tasks such as splicing and sewing the openings of bags or woven materials. The advantages of this process include good sealing after sewing (e.g., flour bags), high strength (e.g., cement bags), and easy unraveling of the stitches (simply pull the end of the thread). The bags can be reused. Based on the stitch type, there are single-thread chain stitch and double-thread chain stitch; based on the number of needles, there are single-needle and double-needle stitches; and based on usage, there are tabletop bag sewing machines, handheld bag sewing machines, and vertical bag sewing machines.

[0003] However, the existing sewing machine's spool and thread guide are not well-matched, resulting in an unsmooth thread pulling process.

[0004] As disclosed in Chinese Patent CN208501241U, a thread holder for a sewing machine allows for adjustment of the height and angle of the thread guide by rotating the adjusting sleeve, making it easier to pull the thread. The rotating base allows the thread guide to be freely adjusted to match the pulling of the thread. Combined with the position of the thread spool, it can be adjusted to a more suitable angle, resulting in a closer fit between the thread spool and the thread guide, which facilitates the operation of the sewing machine.

[0005] However, when the wire frame is installed on the wire drum, it is only directly fitted onto the outer end of the limiting tube without limiting the upper end of the wire drum. As a result, the wire at the outer end of the wire drum is pulled upward. When the wire drum is subjected to the upward pulling force, it may gradually move upward and eventually detach from the outer end of the limiting tube, affecting the operation of the sealing machine.

[0006] Therefore, we urgently need to provide a thread holder structure for sewing machines with backstitching function that can fix the thread spool. Utility Model Content

[0007] The purpose of this invention is to provide a thread rack structure for a sewing machine with a backstitch function that can securely install the thread spool, which helps to ensure that the thread spool will not come off when the thread at the outer end of the spool is pulled upward.

[0008] The purpose of this utility model is achieved as follows: a thread frame structure for a sewing machine with backstitch function, comprising: a fixed platform and a support rod installed on the sewing machine with backstitch function, wherein the support rod is fixedly connected to the upper rear end of the fixed platform, and a thread frame mechanism is connected to the upper side of the fixed platform.

[0009] The wire frame mechanism includes a bearing fixedly connected to the upper side of a fixed platform, a first threaded rod fixedly connected to the inner side of the bearing, a tray fixedly connected to the outer side of the bearing, a sleeve rod connected to the outer side of the first threaded rod, a pressure ring connected to the upper end of the outer side of the sleeve rod, a fixing ring fixedly connected to the lower end of the outer side of the sleeve rod, abutment plates hinged at equal intervals on the upper side of the tray, and a lead wire unit connected to the upper end of the support rod.

[0010] In a specific embodiment of this utility model, the lead wire unit includes a limiting ring fixedly connected to the upper outer side of the support rod, a rotating ring connected to the upper outer side of the support rod, a connecting rod fixedly connected to the right outer side of the rotating ring, a lead wire ring fixedly connected to the right side of the connecting rod, a fixing plate fixedly connected to the outer side of the support rod at the position to the right of the upper end of the rotating ring, a second threaded rod connected inside the fixing plate, and a rotating handle fixedly connected to the upper end of the second threaded rod.

[0011] In another specific embodiment of this utility model, the inner side of the sleeve rod is provided with an internal thread, and the outer side of the first threaded rod is threadedly connected to the inner side of the sleeve rod.

[0012] In another specific embodiment of this utility model, the upper outer side of the sleeve rod is provided with an external thread, the inner side of the pressure ring is provided with an internal thread, the lower side of the pressure ring abuts against the upper end of the spool to be installed, and the upper side of the tray abuts against the lower end of the spool.

[0013] In another specific embodiment of this utility model, the outer end of the fixing ring away from the sleeve rod abuts against the side of the abutment plate close to the sleeve rod, and the outer upper end of the abutment plate abuts against the inner side of the bobbin.

[0014] In a further specific embodiment of this utility model, there are two limiting rings, both of which are fixed to the upper outer side of the support rod. The inner side of the rotating ring is rotatably connected to the outer side of the support rod, and the upper and lower sides of the rotating ring are rotatably connected to the side adjacent to the two limiting rings.

[0015] In a further specific embodiment of this utility model, a threaded hole is provided at the inner front end of the fixing plate, the outer side of the second threaded rod is threadedly connected to the inner side of the threaded hole, the lower end of the second threaded rod abuts against the upper right end of the rotating ring, and a sewing thread passes through the inner side of the lead ring.

[0016] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: First, after placing the spool on the tray and at the outer end of the sleeve rod, the pressure ring on the outer side of the sleeve rod is rotated to move it to the upper end of the spool, thus fixing the spool on the tray between the tray and the pressure ring. As a result, the line at the outer end of the spool is pulled upward. When the spool is subjected to an upward pulling force, the spool will not detach from the upper end of the tray due to the obstruction of the pressure ring. Second, after rotating the connecting rod to rotate the lead ring to a suitable lead direction, the second threaded rod is rotated and moved downward in the threaded hole by rotating the rotating handle until the lower end of the second threaded rod contacts the upper right end of the rotating ring, which can re-fix the rotating ring. Thus, through this adjustment method, the lead ring can be rotated to different lead directions and then re-fixed, thereby better matching the line output of the spool. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present utility model;

[0018] Figure 2 This is a top view of a wireframe mechanism according to an embodiment of the present invention;

[0019] Figure 3 This is a bottom view of a wireframe mechanism according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the lead wire unit structure according to an embodiment of the present invention;

[0021] Figure 5 This is a cross-sectional view of the rotating ring structure according to an embodiment of the present invention.

[0022] In the diagram: 1. Fixed platform; 2. Support rod; 301. Bearing; 302. First threaded rod; 303. Tray; 304. Sleeve rod; 305. Pressure ring; 306. Fixed ring; 307. Support plate; 401. Limiting ring; 402. Rotating ring; 403. Connecting rod; 404. Lead wire ring; 405. Fixed plate; 406. Second threaded rod; 407. Rotating handle. Detailed Implementation

[0023] The following detailed description is provided by way of embodiments. However, the description of the embodiments is not intended to limit the present utility model. Any formal but not substantive equivalent transformations made based on the present utility model concept should be considered within the scope of the present utility model's technical solution.

[0024] In the following description, all directional or orientational concepts such as up, down, left, right, front, and back are based on the positions shown in the accompanying drawings, and therefore should not be construed as a special limitation on the technical solution provided by this utility model.

[0025] Please see Figure 1 and combined Figure 2 , Figure 3 and Figure 4 This paper illustrates a thread frame structure for a sewing machine with a backstitch function, comprising: a fixed platform 1 and a support rod 2. The support rod 2 is fixedly connected to the upper rear end of the fixed platform 1. A thread frame mechanism is connected to the upper side of the fixed platform 1. The thread frame mechanism includes a bearing 301 fixedly connected to the upper side of the fixed platform 1. A first threaded rod 302 is fixedly connected to the inner side of the bearing 301. A tray 303 is fixedly connected to the outer side of the bearing 301. A sleeve rod 304 is connected to the outer side of the first threaded rod 302. A pressure ring 305 is connected to the upper outer end of the sleeve rod 304, and a fixing ring 306 is fixedly connected to the lower outer end of the sleeve rod 304. Abutment plates 307 are hinged at equal intervals on the upper side of the tray 303. An internal thread is provided on the inner side of the sleeve rod 304. The outer side of the first threaded rod 302 is threadedly connected to the inner side of the sleeve rod 304. An external thread is provided on the outer side of the upper end of the sleeve rod 304. An internal thread is provided on the inner side of the pressure ring 305. The lower side of the pressure ring 305 abuts against the upper end of the spool to be installed. The upper side of the tray 303 abuts against the lower end of the spool.

[0026] In use, by placing the spool on the tray 303 and positioning it at the outer end of the sleeve 304, and then rotating the pressure ring 305 on the outer side of the sleeve 304 to move it to the upper end of the spool, the spool on the tray 303 can be fixed between the tray 303 and the pressure ring 305. As a result, the line at the outer end of the spool is pulled upward. When the spool is subjected to an upward pulling force, the spool will not detach from the upper end of the tray 303 due to the obstruction of the pressure ring 305.

[0027] Please continue reading Figure 1 and Figure 2 The outer end of the fixing ring 306 away from the sleeve rod 304 abuts against the side of the abutment plate 307 near the sleeve rod 304, and the outer upper end of the abutment plate 307 abuts against the inner side of the spool.

[0028] In this embodiment, by first rotating the abutment plate 307 to vertically upward, then putting the spool onto the outer end of the sleeve rod 304, and then rotating the sleeve rod 304 so that it moves downward outside the first threaded rod 302, while the fixing ring 306 moves downward together to push the abutment plate 307 outward until the abutment plate 307 rotates to the point where its upper end abuts the inner side of the spool, the spool can be kept fixed in the horizontal direction.

[0029] Please see Figure 1 And please combine Figure 5The upper end of the support rod 2 is connected to a lead wire unit, which includes a limiting ring 401 fixedly connected to the upper outer side of the support rod 2. A rotating ring 402 is connected to the outer side of the upper end of the support rod 2. A connecting rod 403 is fixedly connected to the right outer side of the rotating ring 402. A lead wire ring 404 is fixedly connected to the right side of the connecting rod 403. A fixing plate 405 is fixedly connected to the outer side of the support rod 2 at the upper right side of the rotating ring 402. A second threaded rod 406 is connected inside the fixing plate 405. The upper end of the second threaded rod 406 is fixed... A rotating handle 407 is connected. There are two limiting rings 401, both of which are fixed to the upper outer side of the support rod 2. The inner side of the rotating ring 402 is rotatably connected to the outer side of the support rod 2. The upper and lower sides of the rotating ring 402 are rotatably connected to the adjacent side of the two limiting rings 401. A threaded hole is opened at the front end of the inner side of the fixing plate 405. The outer side of the second threaded rod 406 is threadedly connected to the inner side of the threaded hole. The lower end of the second threaded rod 406 abuts against the upper right end of the rotating ring 402. A sewing thread passes through the inner side of the lead ring 404.

[0030] In this embodiment, after rotating the connecting rod 403 to rotate the lead ring 404 to a suitable lead direction, rotating the rotating handle 407 causes the second threaded rod 406 to rotate in the threaded hole and move downwards until the lower end of the second threaded rod 406 contacts the upper right end of the rotating ring 402, which can fix the rotating ring 402 again. Thus, by adjusting the lead ring 404, it can be rotated to different lead directions and then fixed again, thereby better matching the wire exit of the spool.

[0031] Please see Figure 1 , Figure 2 and Figure 3 And can be combined Figure 4 The applicant briefly describes the working principle of this utility model: When installing the spool, first rotate the abutment plate 307 to vertically upward, then put the spool on the outer end of the sleeve rod 304, then rotate the sleeve rod 304 so that it moves downward outside the first threaded rod 302, and at the same time, the fixing ring 306 moves downward together to push the abutment plate 307 outward until the abutment plate 307 rotates to the inner side of the spool at its upper end, then rotate the pressure ring 305 on the outer side of the sleeve rod 304 so that it moves to the upper end of the spool, fixing the spool on the tray 303 between the tray 303 and the pressure ring 305. Then, pull out a part of the thread from the outer end of the spool and pass it through the inside of the lead ring 404 before connecting it to the sewing machine. After fixing the spool by this installation method, the thread at the outer end of the spool can be pulled upward. When the spool is subjected to an upward pulling force, the spool is blocked by the pressure ring 305 and will not detach from the upper end of the tray 303.

[0032] In summary, the technical solution provided by this utility model makes up for the shortcomings of the prior art, successfully completes the invention task, and faithfully realizes the technical effects described by the applicant in the above technical effect column.

Claims

1. A thread frame structure for a sewing machine with a backstitch function, characterized in that, include: A fixed platform (1) and a support rod (2) are installed on a bag sewing machine with backstitch function. The support rod (2) is fixedly connected to the upper rear end of the fixed platform (1). The fixed platform (1) is characterized by having a thread frame mechanism connected to its upper side. The wire frame mechanism includes a bearing (301) fixedly connected to the upper side of the fixed platform (1), a first threaded rod (302) fixedly connected to the inner side of the bearing (301), a tray (303) fixedly connected to the outer side of the bearing (301), a sleeve rod (304) connected to the outer side of the first threaded rod (302), a pressure ring (305) connected to the upper outer side of the sleeve rod (304), a fixing ring (306) fixedly connected to the lower outer side of the sleeve rod (304), abutment plates (307) hinged at equal intervals on the upper side of the tray (303), and a lead wire unit connected to the upper end of the support rod (2).

2. The thread frame structure for a sewing machine with backstitch function according to claim 1, characterized in that: The lead wire unit includes a limiting ring (401) fixedly connected to the upper outer side of the support rod (2). A rotating ring (402) is connected to the upper outer side of the support rod (2). A connecting rod (403) is fixedly connected to the right outer side of the rotating ring (402). A lead wire ring (404) is fixedly connected to the right side of the connecting rod (403). A fixing plate (405) is fixedly connected to the outer side of the support rod (2) at the position to the right of the upper end of the rotating ring (402). A second threaded rod (406) is connected inside the fixing plate (405). A rotating handle (407) is fixedly connected to the upper end of the second threaded rod (406).

3. The thread frame structure for a sewing machine with backstitch function according to claim 1, characterized in that: The sleeve (304) has an internal thread on its inner side, and the outer side of the first threaded rod (302) is threadedly connected to the inner side of the sleeve (304).

4. The thread frame structure for a sewing machine with backstitch function according to claim 1, characterized in that: The upper outer side of the sleeve (304) is provided with an external thread, the inner side of the pressure ring (305) is provided with an internal thread, the lower side of the pressure ring (305) abuts against the upper end of the spool to be installed, and the upper side of the tray (303) abuts against the lower end of the spool.

5. A thread frame structure for a sewing machine with backstitch function as described in claim 1, characterized in that: The outer end of the fixing ring (306) away from the sleeve rod (304) abuts against the side of the abutment plate (307) near the sleeve rod (304), and the outer upper end of the abutment plate (307) abuts against the inner side of the bobbin.

6. A thread frame structure for a sewing machine with backstitch function according to claim 2, characterized in that: There are two limiting rings (401), both of which are fixed to the upper outer side of the support rod (2). The inner side of the rotating ring (402) is rotatably connected to the outer side of the support rod (2). The upper and lower sides of the rotating ring (402) are rotatably connected to the side adjacent to the two limiting rings (401).

7. A thread frame structure for a sewing machine with backstitch function according to claim 2, characterized in that: The fixed plate (405) has a threaded hole at its front end. The outer side of the second threaded rod (406) is threaded to the inner side of the threaded hole. The lower end of the second threaded rod (406) abuts against the upper right end of the rotating ring (402). A sewing thread passes through the inner side of the lead ring (404).

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