Crank arm type sewing machine

Abstract

The utility model relates to a crank arm type sewing machine which comprises a main machine shell on the upper portion and a lower machine shell on the lower portion, the inner side of the rear end of the main machine shell is connected with the inner side of the rear end of the lower machine shell through a first transverse connecting portion extending downwards in an inclined mode, the front portion of the lower machine shell is a sewing area, and a machine head is arranged above the sewing area. The machine head is connected with the inner side of the front portion of the main machine shell through a second transverse connecting part, and the axial direction of the main machine shell is parallel to the axial direction of the lower machine shell. A main shaft is arranged in the main machine shell, a second synchronous belt transmission mechanism rotationally connected with the main shaft is arranged in the second transverse connecting part, the second synchronous belt transmission mechanism is provided with a transmission crankshaft, a wire bonding device is arranged on the outer side of the second transverse connecting part, and the transmission crankshaft drives the wire bonding device to work; the second transverse connecting part is additionally arranged between the machine head and the main machine shell, the thread bonding device is arranged on the side portion of the second transverse connecting part, due to the fact that the thread bonding device abuts against the machine head, the yarn tightness can be the same as the needle speed of the machine head in frequency, and therefore the quality of sewing stitches is guaranteed.

Description

Technical Field

[0001] This utility model relates to sewing machine technology, specifically a curved arm sewing machine. Background Technology

[0002] For example, utility model CN205275921U discloses a curved arm sewing machine structure, which includes at least a main housing and a lower housing located below the main housing; a transverse connecting portion is provided between the main housing and the lower housing, extending obliquely downward from the inner side of one end of the main housing and communicating with the lower housing; a main drive mechanism is provided inside the main housing, and a sewing platform is provided on the lower housing; a synchronous drive mechanism that rotates synchronously with the main drive mechanism is provided in the transverse connecting portion, and a cooperative drive mechanism located directly above the lower housing and driven by the synchronous drive mechanism; The main drive mechanism has a main shaft, and the co-drive mechanism has a co-drive shaft. A sewing head is located above the sewing platform. This utility model provides a modified articulated arm sewing machine structure with a modified outer shell, allowing the user to maintain a good sitting posture and easily look directly at the sewing area, thus protecting the user's health and enabling safer work during sewing. Another objective of this utility model is to provide a thread applicator that allows the user to more easily and quickly remove tangled thread, making it easier and more convenient to re-thread the thread, to meet the user's needs.

[0003] Due to structural limitations, the thread beater of the aforementioned articulated arm sewing machine can only be placed near the transverse connection of the main body housing. This position is far from the machine head at the other end of the main body housing. Because the thread beater is far from the machine head, the tension adjustment of the thread beater lags behind the speed change of the machine head and needle. As a result, the tension of the yarn cannot match the speed of the machine head and needle, thus affecting the sewing quality. Utility Model Content

[0004] The purpose of this utility model is to provide a curved arm sewing machine, which extends the transverse connecting part and adds a second transverse connecting part between the machine head and the main body housing. The thread take-off of the machine head is located on the side of the second transverse connecting part. Since the side of the second transverse connecting part is close to the machine head, the yarn tension can be synchronized with the speed of the machine head needle, thereby ensuring the quality of the sewing stitches.

[0005] To achieve the above objectives, the following technical solution is adopted:

[0006] A curved arm sewing machine includes an upper main housing and a lower lower housing. The inner rear ends of the main housing and the lower housing are connected by a first transverse connecting portion extending downward at an angle. The front part of the lower housing is a sewing area, and a sewing head is arranged above the sewing area. The sewing head is connected to the inner front part of the main housing by a second transverse connecting portion, and the axial direction of the main housing and the lower housing are kept parallel. A main shaft is located inside the main housing. A second synchronous belt drive mechanism, rotatably connected to the main shaft, is located inside the second transverse connecting portion. The second synchronous belt drive mechanism has a drive crankshaft. A thread take-up device is arranged on the outer side of the second transverse connecting portion relative to the first transverse connecting portion. The drive crankshaft drives the thread take-up device, and the drive crankshaft is connected to a transmission mechanism inside the sewing head and drives the sewing head to work.

[0007] The main unit housing is provided with a base connection part on the outside.

[0008] The front end of the main housing is equipped with a drive motor that is coaxially connected to the main shaft.

[0009] This invention adds a second transverse connecting part between the machine head and the inner front part of the main body housing. This provides a position for installing the stitching device on the outer side of the second transverse connecting part. The outer side of the second transverse connecting part is close to the machine head, so that the yarn tension is synchronized with the speed of the machine head needle, thereby ensuring the quality of the sewing stitches. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model;

[0011] Figure 2 This is a schematic diagram of the internal drive and transmission structure of this utility model;

[0012] Figure 3 This is a schematic diagram of the structure of the outer side of the main housing of this utility model. Detailed Implementation

[0013] like Figure 1-3As shown, a curved arm sewing machine includes an upper main body housing 1 and a lower lower housing 2. The inner rear ends of the main body housing 1 and the lower housing 2 are connected by a first transverse connecting part 3 extending downward at an angle. The front part of the lower housing 2 is a sewing area 21. A sewing head 4 is arranged above the sewing area 21. The sewing head 4 is connected to the inner front part of the main body housing 1 by a second transverse connecting part 5. Because a second transverse connecting part 5 is added between the sewing head 4 and the inner front part of the main body housing 1, the first transverse connecting part needs to be lengthened compared to the existing design to ensure that the axial direction of the main body housing 1 and the axial direction of the lower housing 2 remain parallel. The main body housing 1 contains... There is a main shaft 11, and a drive motor 8 coaxially connected to the main shaft 1 is provided at the front end of the main housing 1; a first synchronous drive mechanism is rotatably connected to the main shaft 11 in the first transverse connecting part 3, and a second synchronous belt drive mechanism 6 is rotatably connected to the main shaft 11 in the second transverse connecting part 5. The second synchronous belt drive mechanism 6 has a drive crankshaft 61, and a wire punch 7 is provided on the outer side of the second transverse connecting part relative to the first transverse connecting part. The drive crankshaft 61 drives the wire punch 7 to work. The drive crankshaft 61 is connected to the transmission mechanism 9 inside the machine head and drives the machine head 4 to work; a base connecting part 12 is provided on the outer side of the main housing 1.

[0014] This invention extends the length of the first transverse connecting part and adds a second transverse connecting part between the inner front part of the machine head and the main body housing. The second transverse connecting part has a position for installing a thread beater on the outer side of the first transverse connecting part. Since the thread beater is close to the machine head, the yarn immediately enters the machine head after passing through the thread beater. This ensures that the tension of the yarn is synchronized with the speed of the machine head needle, thereby ensuring the quality of the sewing stitches.

Claims

1. A curved arm sewing machine, comprising an upper main body housing (1) and a lower lower housing (2), wherein the inner rear ends of the main body housing (1) and the lower housing (2) are connected by a first transverse connecting portion (3) extending downward at an incline, the front of the lower housing (2) is a sewing area (21), and a sewing head (4) is disposed above the sewing area (21), characterized in that: The machine head (4) is connected to the inner front part of the main housing (1) by a second transverse connecting part (5). The main housing (1) has a main shaft (11). The second transverse connecting part (5) has a second synchronous belt drive mechanism (6) that is rotatably connected to the main shaft (11). The second synchronous belt drive mechanism (6) has a drive crankshaft (61). A wire punch is provided on the outer side of the second transverse connecting part (5) relative to the first transverse connecting part (3). The wire punch (7) is driven by the drive crankshaft (61). The drive crankshaft (61) is also connected to the transmission mechanism (9) inside the machine head and drives the machine head (4) to work.

2. The articulated arm sewing machine as described in claim 1, characterized in that: The main unit housing (1) is provided with a base connection part (12) on the outside.

3. The articulated arm sewing machine as described in claim 1, characterized in that: The front end of the main housing (1) is provided with a drive motor (8) that is coaxially connected to the main shaft (11).

4. The articulated arm sewing machine as described in claim 1, characterized in that: The axial direction of the main housing (1) and the axial direction of the lower housing (2) remain parallel.

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