CN207552615U - Flat seam machine anti-crease arrangement - Google Patents

Abstract

The utility model discloses an anti-wrinkle device for a lockstitch sewing machine, which comprises a needle plate (1), a presser foot (2) and a cloth feeding dog (3). The main body can be disassembled and installed. The feed dog (3) obtains the required kinetic energy through the drive of the feed shaft (4) and the tooth lifting shaft (7). There is a window hole (1.2) at the rear end of the groove (1.1), and a swing rod (11) is sleeved on the tooth lifting shaft (7), and the top of the swing rod (11) is provided with a push rod matching the window hole (1.2) (9); also includes the compression spring (1.3), the top of the compression spring (1.3) is provided with an extrusion plate (1.4), the needle plate (1) is provided with a through hole matching the extrusion plate (1.4), and the compression spring (1.3) The bottom is installed under the needle plate (1) through the fixing rod (12). The utility model does not appear wrinkles when fabrics are sewn, achieves anti-wrinkle effects, and reduces the work difficulty of operators.

Description

Anti-wrinkle device for lockstitch sewing machine

technical field

The utility model relates to an anti-wrinkle device for a lockstitch sewing machine.

Background technique

A lockstitch sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material to interweave or sew one or more layers of sewing material. Lockstitch sewing machine can sew cotton, hemp, silk, wool, artificial fiber and other fabrics and leather, plastic and other products. The stitches are neat and beautiful, flat and firm.

Existing lockstitch sewing machines generally include a platen and a foot pedal installed on the frame. The machine head and the needle plate are installed on the platen. The machine head is provided with machine needles, and the sewing material can be sewn on the needle plate. But when sewing, the sewing material cannot be made to be tight, so that the upper thread or the bottom thread that is sewn out is sometimes tight and sometimes loose, causing wrinkles to occur in the sewing material, and increases the follow-up ironing treatment work of sewing, and increases the production cost.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art and provide an anti-wrinkle device for a lockstitch sewing machine.

The purpose of this utility model is achieved through the following technical solutions: lockstitch machine anti-wrinkle device, including needle plate, presser foot and cloth feeding dog, the needle plate, presser foot and locket sewing machine body can be disassembled and installed, and the cloth feeding dog The front end of the shaft is connected with the tooth frame set on the feeding shaft, and the rear end is connected with the tooth lifting slider. There is a tooth hole groove on the plate, a window hole is opened at the rear end of the tooth hole groove, a swing rod is sleeved on the lifting shaft, and a push rod matching the window hole is arranged on the top of the swing rod;

The anti-wrinkle device of the lockstitch sewing machine also includes a compression spring, the top of the compression spring is provided with an extrusion plate, the needle plate is provided with a through hole matching the extrusion plate, and the bottom of the compression spring is installed under the needle plate through a fixing rod.

The feeding tooth is composed of a driving tooth and a pulling tooth, and the height of the tip of the driving tooth is lower than that of the pulling tooth.

The anti-wrinkle device of the locket sewing machine also includes a thread take-up spring, and the thread take-up spring is fixed on the front end of the bottom plate of the presser foot by screws.

The anti-wrinkle device of the lockstitch sewing machine also includes a shearing part arranged on the needle plate, a stepped groove is arranged in the shearing part, and a hard blade is fixedly connected to the stepped groove.

The beneficial effects of the utility model are:

1) The cooperative work of the ejector rod, the compression spring with the extrusion plate and the presser foot makes it possible to avoid wrinkles when sewing the sewing material, which reduces the difficulty of the operator's work and reduces the workload of subsequent ironing, thus reduce manufacturing cost.

2) The position of the hard blade and the position of the pinhole are fixed, so the distance between the suture and the cutting edge remains unchanged. Wait for the situation.

3) Using the elastic effect of the thread take-up spring can effectively avoid the phenomenon of one or two needle skipping and stitch deviation during high and low sewing.

4) When the presser foot and the ejector rod work together to fix the sewing material, since the tooth tip height line of the transmission tooth is lower than the tooth tip height line of the pulling tooth, when the pulling tooth is pulling the cloth, the driving tooth and the presser foot There is a looser space between them, the sewing material will not be blocked by the presser foot, and the sewing material will not be stretched and deformed.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the ejector rod in the state of extension;

Figure 2 is a schematic diagram of the structure of the ejector rod in a lowered state:

Figure 3 is a schematic diagram of the position and structure of the compression spring:

Figure 4 is a schematic diagram of the installation position of the thread take-up spring;

Fig. 5 is a schematic diagram of the structure of the cutting part of the utility model;

In the figure, 1-needle plate, 1.1-thread hole groove, 1.2-window hole, 1.3-compression spring, 1.4-extrusion plate, 2-presser foot, 2.1-thread take-up spring, 3-feed dog, 3.1-transmission Teeth, 3.2-pulling tooth, 4-feeding shaft, 5-tooth holder, 6-lifting slider, 7-lifting shaft, 8-lifting crank, 9-ejector, 10-cutting part, 11 - swing bar, 12 - fixed bar, 13 - sewing material.

Detailed ways

The technical solutions of the present utility model will be clearly and completely described below in conjunction with the embodiments. Apparently, the described embodiments are only some of the embodiments of the present utility model, but not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present utility model.

Referring to Figures 1-5, the utility model provides a technical solution: as shown in Figures 1 and 2, the anti-wrinkle device of a lockstitch sewing machine includes a needle plate 1, a presser foot 2 and a cloth feeding dog 3, and the needle plate 1, The presser foot 2 is detachably installed with the body of the lockstitch sewing machine. The front end of the cloth feed dog 3 is connected with the tooth frame seat set on the feed shaft 4 with 5 shafts, and the rear end is connected with the tooth lifting slider with 6 shafts, and the tooth lifting slider is 6 cards. Installed in the fork groove of the fork-shaped tooth-lifting crank 8 fixedly connected with the tooth-lifting shaft 7, the needle plate 1 is provided with a tooth hole groove 1.1, and the rear end of the tooth hole groove 1.1 has a window hole 1.2, and the tooth-lifting shaft 7 is put on the Connected with a swing rod 11, the top of the swing rod 11 is provided with a push rod 9 matched with the window hole 1.2. Through the window hole 1.2.

The tooth lifting shaft 7 and the feeding shaft 4 work together to drive the cloth feeding dog 3 to move counterclockwise according to the elliptical trajectory. When the tooth lifting shaft 7 and the feeding shaft 4 swing clockwise, the cloth feeding dog 3 drives the fabric to move forward. The lifting shaft 7 drives the pendulum 11 to rotate clockwise, thereby driving the ejector rod 9 to pass through the window hole 1.2 on the needle plate 1, press the fabric from bottom to top, apply a clamping force to the fabric together with the presser foot 2, and send Cloth tooth 3 makes upward and forward feeding movement, and also acts on the fabric together with presser foot 2, so that when sewing, there is a force to clamp and tighten the fabric at the front and back, so that the fabric collapses and the needle moves toward When the thorn material is lowered, the lower fabric will not be stretched too much, thus effectively avoiding the appearance of waves and wrinkles, and achieving the purpose of anti-wrinkle.

Preferably, as shown in Figure 3, the cloth feeding dog 3 is composed of a driving tooth 3.1 and a cloth pulling tooth 3.2. When the presser foot 2 cooperates with the ejector rod 9 to fix the sewing material, since the tip height of the driving tooth 3.1 is low At the tip height of the pulling teeth 3.2, when the pulling teeth 3.2 are pulling the cloth, there is a relatively loose space between the transmission teeth 3.1 and the presser foot 2, and the sewing material will not be blocked by the presser foot 2, that is, It will not be stretched and deformed.

The anti-wrinkle device of the lockstitch machine also includes a compression spring 1.3, the top of the compression spring 1.3 is provided with an extrusion plate 1.4, the needle plate 1 is provided with a through hole matching the extrusion plate 1.4, and the bottom of the compression spring 1.3 passes through the fixed rod 12 Installed under the needle plate 1, when the presser foot 2 is pressed down, the extruding plate 1.4 presses the sewing material upwards under the elastic force of the compression spring 1.3 (marked 13 in Fig. 3 ), which also has anti-wrinkle effect.

As shown in Figure 4, the anti-wrinkle device of the locket sewing machine also includes a thread take-up spring 2.1, and the thread take-up spring 2.1 is fixed on the front end of the bottom plate of the presser foot 2 by screws, and the thread take-up spring 2.1 itself has elasticity, Utilize this elastic energy to effectively avoid the phenomenon of one or two needle skipping and stitch deviation during high and low sewing.

As shown in Figure 5, the anti-wrinkle device of the lockstitch sewing machine also includes a shearing part 10 arranged on the needle plate 1, a stepped groove is provided in the shearing part 10, and a hard blade 10.1 is fixed in the stepped groove. , fix the hard blade 1.1 directly on the needle plate 1. On the one hand, the sewing material is cut while sewing. Since the position of the hard blade 10.1 and the position of the pinhole are fixed, the suture and the cutting edge The distance remains unchanged, the margins at the seams are uniform, and the appearance is neat, and it is not easy to turn over or fail to wrap when hemming; on the other hand, in the general sewing process, the overlapping sewing materials need to be trimmed first. Edge trimming requires careful sewing in order to make the margins the same, which affects the processing speed and requires high operating skills of the operator. After adding a hard blade 10.1 to the body of the needle plate 1, it is not necessary to accurately align the cloth edge before processing, and it is not necessary to walk during processing. The change of the distance between the line and the edge has little effect on the margin of the seam, so the processing efficiency can be improved during the processing and the skill requirement of the operator can be reduced.

The above descriptions are only preferred implementations of the present utility model, and it should be understood that the present utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments , and can be modified within the scope of the ideas described herein by the teachings above or by skill or knowledge in the relevant art. However, changes and changes made by those skilled in the art do not depart from the spirit and scope of the utility model, and should all be within the protection scope of the appended claims of the utility model.

Claims (4)

1. Anti-wrinkle device of lockstitch sewing machine, including needle plate (1), presser foot (2) and cloth feed dog (3). The needle plate (1), presser foot (2) and locket sewing machine body are detachable and installed. The front end of the cloth feeding dog (3) is axially connected with the tooth frame seat (5) set on the feeding shaft (4), and the rear end is axially connected with the tooth lifting slider (6), and the tooth lifting slider (6) is clamped on the In the fork groove of the fork-shaped tooth-lifting crank (8) fixedly connected with the tooth-lifting shaft (7), it is characterized in that: the needle plate (1) is provided with a tooth hole groove (1.1), and the rear end of the tooth hole groove (1.1) A window hole (1.2) is opened, a swing rod (11) is sleeved on the lifting shaft (7), and the top of the swing rod (11) is provided with a push rod (9) matching with the window hole (1.2); It also includes a compression spring (1.3), the top of the compression spring (1.3) is provided with an extrusion plate (1.4), the needle plate (1) is provided with a through hole matching the extrusion plate (1.4), and the bottom of the compression spring (1.3) is It is installed under the needle plate (1) through the fixed rod (12). 2. The anti-wrinkle device of lockstitch sewing machine according to claim 1, characterized in that: the feeding dog (3) is composed of a driving tooth (3.1) and a cloth pulling tooth (3.2), and the tip of the driving tooth (3.1) The height is lower than the tip height of puller teeth (3.2). 3. The anti-wrinkle device for locket sewing machine according to claim 1, characterized in that it also includes a thread take-up spring (2.1), and the thread take-up spring (2.1) is fixed on the front end of the bottom plate of the presser foot (2) by screws . 4. The anti-wrinkle device for locket sewing machine according to claim 1, characterized in that it further comprises a shearing part (10) arranged on the needle plate (1), and a step groove is provided in the shearing part (10) , a hard blade (10.1) is fixed in the step groove.