A sewing machine needle bar that is easy to adjust the stroke

Abstract

This utility model relates to the field of sewing machine technology, specifically a sewing machine needle bar with adjustable stroke. It includes an outer frame body with a snap-fit ​​assembly on its inner side. A needle bar mechanism is snapped and fixed to the outer frame body via the snap-fit ​​assembly. The needle bar mechanism includes an inner support block, which is vertically slidably connected to the outer frame body. The outer frame body has a needle bar mounting groove, and a reverse threaded rod is rotatably connected to the groove via a bearing. Sewing needle bars are threaded onto the reverse threads of the reverse threaded rod. The end of the reverse threaded rod passes through the inner support block and is welded with a fine-tuning knob. By rotating the fine-tuning knob, two sets of sewing needle bars can be moved synchronously away and towards each other under the action of the reverse threaded rod. The inner support block can be quickly locked via the snap-fit ​​assembly, thus achieving adjustment of the needle bar spacing and stroke.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, specifically a sewing machine needle bar that facilitates stroke adjustment. Background Technology

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on a fabric, allowing one or more layers of fabric to interweave or sew together. Sewing machines can sew fabrics such as cotton, linen, silk, wool, and synthetic fibers, as well as products such as leather, plastic, and paper. The stitches produced are neat, beautiful, flat, and strong. Sewing is fast and easy to use, and it has given rise to art forms such as hand embroidery and computer embroidery.

[0003] Currently, most existing double-needle sewing machines on the market have needle bar mechanisms that are difficult to adjust the distance between the two needles. This results in the need to change the needle bar structure when sewing different widths of thread, leading to reduced efficiency when switching the sewing width of double-needle sewing. Furthermore, the needle stroke of existing double-needle sewing machines can only be changed by adjusting external parameters, and cannot achieve double protection by adjusting the needle bar stroke. Utility Model Content

[0004] To address the shortcomings of existing technologies and the problem of needing to replace the needle bar structure when adjusting sewing threads of different widths, this invention proposes a sewing machine needle bar that facilitates stroke adjustment.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a sewing machine needle bar that is easy to adjust the stroke, including an outer frame body, a snap-fit ​​component is provided on the inner side of the outer frame body, and a needle bar mechanism is snapped and fixed to the outer frame body through the snap-fit ​​component.

[0006] The needle bar mechanism includes an internal support block, which is vertically slidably connected to the outer frame body. The outer frame body has a needle bar mounting groove, in which a reverse threaded rod is rotatably connected via a bearing. A sewing needle bar is threaded onto the reverse thread of the reverse threaded rod. The end of the reverse threaded rod passes through the internal support block and is welded with a fine-tuning knob.

[0007] Preferably, the external frame body includes two sets of symmetrically arranged upright plates, which are fixed by welding five sets of connecting columns, and an organic head connecting column is welded to the center of the upper part of the upright plates.

[0008] Preferably, the snap-fit ​​assembly includes a snap-fit ​​groove formed on the inner side of the upright plate, and the snap-fit ​​groove is provided in several sets at equal intervals.

[0009] Preferably, the snap-fit ​​assembly further includes four sets of side grooves formed in the internal support block, with snap-fit ​​blocks slidably connected inside the side grooves, connecting rods integrally formed between the snap-fit ​​blocks, and pull blocks integrally formed outside the connecting rods.

[0010] Preferably, three sets of tension springs are provided on one side of the connecting rod, and the ends of the tension springs are respectively embedded in the side groove and the connecting rod. A limiting piece is integrally formed on the outside of the side groove, and the limiting piece is located on the outside of the locking block.

[0011] Preferably, the lower part of the sewing needle bar has a thread hole, and the upper part of the sewing needle bar has a through threaded hole.

[0012] Preferably, a lateral limiting component is provided between the middle parts of the two sets of sewing needle bars, and the lateral limiting component is symmetrically arranged on both sides of the reverse threaded rod.

[0013] Preferably, the lateral limiting component includes a limiting guide rod, and the inner side of the sewing needle bar has a slot, with both ends of the limiting guide rod being inserted into the slots of two sets of sewing needle bars respectively.

[0014] The advantages of this utility model are:

[0015] 1. This utility model allows two sets of sewing needle bars to move synchronously away and towards each other under the action of a reverse threaded rod by rotating a fine-tuning knob. A lateral limiting component is provided between the two sewing needle bars to ensure that they remain vertical, thus guaranteeing the strength and aesthetics of the sewing thread. This achieves the effect of quickly adjusting the distance between the two sets of sewing needle bars without replacing the needle bar structure, solving the problem of needing to replace the needle bar structure when adjusting sewing threads of different widths, and improving sewing efficiency.

[0016] 2. This utility model, by sliding the internal support block inside the outer frame body, allows the internal support block to be adjusted to its position inside the outer frame body, thus physically limiting the needle stroke. Combined with the needle stroke parameters of the sewing machine, the change in stroke is guaranteed by two layers. Furthermore, the internal support block can be quickly locked through the snap-fit ​​component, solving the problem that the needle stroke of a double-needle sewing machine can only be changed by adjusting external parameters. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the external frame body of this utility model;

[0020] Figure 3 This is a cross-sectional structural diagram of the external frame body of this utility model;

[0021] Figure 4 This is a schematic diagram of the snap-fit ​​assembly of this utility model;

[0022] Figure 5 This utility model Figure 4 Enlarged view of A in the middle;

[0023] Figure 6 This is a cross-sectional structural diagram of the internal support block of this utility model;

[0024] Figure 7 This is a schematic diagram of the lateral limiting component of this utility model.

[0025] In the diagram: 1. External frame body; 2. Snap-fit ​​assembly; 3. Needle bar mechanism; 30. Lateral limiting assembly; 101. Vertical plate; 102. Head connecting column; 201. Slot; 202. Side slot; 203. Locking block; 204. Connecting rod; 205. Pull block; 206. Tension spring; 207. Limiting plate; 301. Internal support block; 302. Needle bar mounting slot; 303. Reverse threaded rod; 304. Sewing needle bar; 305. Fine adjustment knob; 306. Thread hole; 307. Threaded hole; 308. Limiting guide rod; 309. Slot. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0027] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0028] This application discloses a sewing machine needle bar that facilitates stroke adjustment. (See also...) Figure 1 and Figure 4 A sewing machine needle bar with adjustable stroke includes an outer frame body 1, a snap-fit ​​component 2 is provided on the inner side of the outer frame body 1, and a needle bar mechanism 3 is snapped and fixed to the outer frame body 1 by the snap-fit ​​component 2.

[0029] The needle bar mechanism 3 includes an internal support block 301, which is vertically slidably connected to the outer frame body 1. The outer frame body 1 has a needle bar mounting groove 302. A reverse threaded rod 303 is rotatably connected to the needle bar mounting groove 302 through a bearing. A sewing needle bar 304 is threaded onto the reverse thread of the reverse threaded rod 303. The end of the reverse threaded rod 303 passes through the internal support block 301 and is welded with a fine adjustment knob 305.

[0030] Reference Figure 1 and Figure 2 The outer frame body 1 includes two sets of symmetrically arranged upright plates 101. The upright plates 101 are fixed by welding five sets of connecting columns. The connecting columns are distributed in three sets at the bottom and two sets at the top. The connecting columns can also prevent the internal support block 301 of the needle bar mechanism 3 from falling excessively. The upper center of the upright plate 101 is welded with a machine head connecting column 102. By setting the machine head connecting column 102, the needle bar mechanism 3 can be installed in the lower part of the sewing machine head through the outer frame body 1.

[0031] Reference Figure 1 and Figure 2 The snap-fit ​​component 2 includes a snap-fit ​​groove 201 opened on the inner side of the upright plate 101. Several sets of snap-fit ​​grooves 201 are equally spaced. By setting the snap-fit ​​grooves 201, the vertical position of the internal support block 301 can be locked by cooperating with the snap-fit ​​component 2.

[0032] Reference Figure 4 and Figure 5 The snap-fit ​​assembly 2 also includes four sets of side grooves 202 formed in the inner support block 301. The side grooves 202 are slidably connected with snap-fit ​​blocks 203. The snap-fit ​​blocks 203 are integrally formed with connecting rods 204. The connecting rods 204 are integrally formed with pull blocks 205. The snap-fit ​​blocks 203 can be inserted into the snap-fit ​​slots 201 to fix the position of the inner support block 301. The pull blocks 205 make it easy for workers to pull the snap-fit ​​blocks 203 inward to unlock the lock.

[0033] Reference Figure 3 and Figure 5Three sets of tension springs 206 are arranged at equal intervals on one side of the connecting rod 204, and the ends of the tension springs 206 are respectively embedded in the side groove 202 and the connecting rod 204. A limiting piece 207 is integrally formed on the outside of the side groove 202, and the limiting piece 207 is located on the outside of the locking block 203. The limiting piece 207 can prevent the locking block 203 from disengaging from the side of the side groove 202. Under the elastic force of the tension springs 206, the locking block 203 can automatically engage with the locking groove 201 to achieve locking.

[0034] Reference Figure 6 and Figure 7 The sewing needle bar 304 has a thread hole 306 at the lower part and a through threaded hole 307 at the upper part. The thread hole 306 is used to connect the thread to the sewing needle bar 304. The threaded holes 307 of the two sewing needle bars 304 are reverse threads. When combined with the reverse threads of the reverse threaded rod 303, they can move closer or further away synchronously.

[0035] Reference Figure 6 and Figure 7 A transverse limiting component 30 is provided between the middle of the two sets of sewing needle bars 304, and the transverse limiting component 30 is symmetrically arranged on both sides of the reverse threaded rod 303. The transverse limiting component 30 can guide the two sewing needle bars 304 when the distance between them is adjusted by the fine adjustment knob 305, so that the two sewing needle bars 304 can be kept as vertical as possible.

[0036] Reference Figure 6 and Figure 7 The lateral limiting component 30 includes a limiting guide rod 308. A slot 309 is provided on the inner side of the sewing needle bar 304. The two ends of the limiting guide rod 308 are respectively inserted into the slots 309 of the two sets of sewing needle bars 304. The end of the limiting guide rod 308 is also integrally formed with a limiting seat, which can prevent the limiting guide rod 308 from disengaging from the slot 309.

[0037] Working principle: The needle bar mechanism 3 is installed below the sewing machine head via the head connecting column 102 on the outer frame body 1. Then, by pulling the pull block 205 on the connecting rod 204 inward, the locking block 203 and the locking groove 201 are separated and unlocked. After sliding the internal support block 301 to the predetermined position, the pull block 205 is released, allowing the locking block 203 and the locking groove 201 to re-engage and lock. When it is necessary to adjust the spacing between the sewing needle bars 304, the spacing between the sewing needle bars 304 can be adjusted by rotating the fine adjustment knob 305. There is no need to replace the needle bar structure, which solves the problem of needing to replace the needle bar structure when adjusting sewing threads of different widths, thus improving sewing efficiency.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A sewing machine needle bar facilitating the adjustment of the stroke, comprising an external frame body (1), characterized in that: The outer frame body (1) is provided with a snap-fit ​​component (2) on its inner side, and the outer frame body (1) is snap-fitted and fixed with a needle bar mechanism (3) by the snap-fit ​​component (2). The needle bar mechanism (3) includes an internal support block (301), which is vertically slidably connected to the outer frame body (1). The outer frame body (1) has a needle bar mounting groove (302). A reverse threaded rod (303) is rotatably connected to the needle bar mounting groove (302) through a bearing. A sewing needle bar (304) is threaded onto the reverse thread of the reverse threaded rod (303). The end of the reverse threaded rod (303) passes through the internal support block (301) and is welded with a fine adjustment knob (305).

2. The stitcher needle bar of claim 1 wherein: The external frame body (1) includes two sets of symmetrically arranged upright plates (101). The upright plates (101) are fixed by welding five sets of connecting columns. An organic head connecting column (102) is welded to the center of the upper part of the upright plate (101).

3. The stitcher needle bar of claim 2 wherein: The snap-fit ​​assembly (2) includes a snap-fit ​​slot (201) opened on the inner side of the upright plate (101), and the snap-fit ​​slot (201) is provided in several groups at equal intervals.

4. The stitcher needle bar of claim 2 wherein: The snap-fit ​​assembly (2) further includes four sets of side grooves (202) formed in the inner support block (301). The side grooves (202) are slidably connected to the inside of the side grooves (202), and the snap-fit ​​blocks (203) are integrally formed with connecting rods (204) between the snap-fit ​​blocks (203). The connecting rods (204) are integrally formed with pull blocks (205) on the outside.

5. The stitcher needle bar of claim 4 wherein: Three sets of tension springs (206) are arranged at equal intervals on one side of the connecting rod (204), and the ends of the tension springs (206) are respectively embedded in the side groove (202) and the connecting rod (204). A limiting piece (207) is integrally formed on the outside of the side groove (202), and the limiting piece (207) is located on the outside of the locking block (203).

6. The stitcher needle bar of claim 1 wherein: The sewing needle bar (304) has a thread hole (306) at its lower part and a through thread hole (307) at its upper part.

7. A sewing machine needle bar for facilitating adjustment of the stroke as defined in claim 6, wherein: A transverse limiting component (30) is provided between the middle of the two sets of sewing needle bars (304), and the transverse limiting component (30) is symmetrically arranged on both sides of the reverse threaded rod (303).

8. The stitcher needle bar of claim 7 wherein: The lateral limiting component (30) includes a limiting guide rod (308), and a slot (309) is provided on the inner side of the sewing needle bar (304). The two ends of the limiting guide rod (308) are respectively inserted into the slots (309) of the two sets of sewing needle bars (304).

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