CN204728065U - Balance structure of sewing machine - Google Patents

Abstract

The utility model relates to the technical field of sewing machines, in particular to a balance structure of a sewing machine, which comprises a sewing machine shell and a needle rod, wherein a balance fixing seat is additionally arranged on the sewing machine shell, a balance and a thread clamping device are arranged on the balance fixing seat, the balance is positioned above the needle rod, and the vertical swing center of the balance and the center of the needle rod are positioned on the same central line; the balance is driven by a crank to swing up and down, the crank is installed on a balance fixing seat and is connected with a transmission synchronous belt wheel through a rotating shaft. The utility model adds a group of crank, balance and thread clamping device structure on the basis of the original shell, the upper thread is directly threaded from the added balance, and the up-down swing center of the balance and the center of the needle rod are positioned on the same central line, through the actual test, the thread-threading pressure is smaller than the balance position structure of the transmission sewing machine, the thread-threading is smoother, and the adjustment of the lower thread of the upper thread is simpler and more convenient; the sewing line is beautiful, and the sewing quality is improved.

Description

Balance structure of sewing machine

technical field

The utility model relates to the technical field of sewing machines, in particular to a balance structure of the sewing machine.

Background technique

The traditional sewing mechanism generally includes an upper casing and a lower casing, an upper shaft motor and a needle bar mechanism installed on the upper casing, and an upper shaft motor and a needle bar mechanism that are respectively connected to the upper shaft motor and the needle bar mechanism in the upper casing. Shaft, as well as the lower shaft motor and the shuttle bed mechanism installed on the lower casing, are formed by the lower shaft which is installed in the lower casing and is respectively connected with the lower shaft motor and the shuttle bed transmission. The upper shaft is driven by the upper shaft motor to rotate, and the upper shaft The shaft drives the needle bar mechanism to move up and down to realize the up and down sewing action of the sewing needle, and the lower shaft motor drives the lower shaft to rotate, and the lower shaft drives the shuttle bed mechanism to move to cooperate with the sewing needle for sewing operation. When sewing, the upper thread must pass through the inside of the needle bar. The balance and thread tensioner of the existing sewing machine are installed in the traditional position of the casing. The lowest point of the balance is lower than the upper plane of the needle bar. According to the sewing machine needle bar and the balance must move up and down synchronously. In order to work normally, the upper thread must pass through the balance and the thread clamp, turn 360 degrees and come out from the inside of the needle bar. Therefore, the thread passing pressure is very high, the tension of the upper and lower threads is difficult to adjust, the sewing line is not beautiful, and it is easy to cause a series of problems such as throwing the upper and lower threads, rotten threads, and uneven lines.

Contents of the invention

The purpose of this utility model is to overcome the above-mentioned defects in the prior art, and provide a sewing machine balance whose thread passing pressure is smaller than that of the balance position structure of the transmission sewing machine, the thread passing is smoother, and the adjustment of the upper and lower threads is simpler and more convenient. structure.

In order to achieve the above object, the utility model adopts the following technical solutions:

The balance structure of the sewing machine includes a sewing machine casing and a needle bar. A balance fixing seat is attached to the sewing machine casing. A balance and a thread clamp are arranged on the balance fixing seat. The balance is located above the needle bar, and the balance swings up and down. The centers of the needle bars are on the same center line.

The balance is driven by a crank to swing up and down, the crank is installed on the balance fixed seat, and a transmission synchronous pulley is connected with the rotating shaft.

The crank is eccentrically hinged to an eccentric connecting rod, the other end of the eccentric connecting rod is hinged to the middle section of the balance, and the end of the balance opposite to the thread passing end is hinged to the sewing machine casing.

The utility model adds a set of crank, balance and thread clamp structure on the basis of the original organic shell, the upper thread directly passes through the added balance, and the swing center of the balance is on the same center line as the center of the needle bar. The test shows that the thread passing pressure is smaller than the balance position structure of the transmission sewing machine, the thread passing is smoother, and the adjustment of the upper and lower threads is simpler and more convenient; the sewing line is beautiful and the sewing quality is improved.

Description of drawings:

Accompanying drawing 1 is the structural representation of preferred embodiment of the utility model;

Accompanying drawing 2 is the side view of Fig. 1 embodiment.

Detailed ways:

The conception, specific structure and technical effects of the present utility model will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose, characteristics and effects of the present utility model.

Referring to shown in Fig. 1, 2, it is the schematic diagram of preferred embodiment of the present utility model, the utility model relates to a kind of balance structure of sewing machine, comprises sewing machine casing 1 and needle bar 2, on sewing machine casing 1, attaches a The balance holder 3 is provided with a balance 4 and a thread gripper 5 on the balance holder 3, the balance 4 is located above the needle bar 2, and the swing center of the balance 4 is on the same center line as the needle bar 2 center. When in use, the upper thread directly passes through the added balance 4, and the swing center of the balance 4 is on the same center line as the center of the needle bar 2. After actual testing, the thread passing pressure is smaller than that of the balance position structure of the transmission sewing machine. The thread passing is smoother, and the adjustment of the upper thread and the lower thread is simpler and more convenient; the sewing line is beautiful, and the sewing quality is improved.

As shown in Figures 1 and 2, in this embodiment, the balance 4 is driven to swing up and down by a crank 6, and the crank 6 is installed on the balance holder 3, and is connected with a transmission synchronous pulley 7 through a rotating shaft. The transmission synchronous pulley 7 is connected to the balance transmission mechanism of the original sewing machine by the synchronous belt, thereby obtaining synchronous effect. Among the figure, the crank 6 is eccentrically hinged with an eccentric connecting rod 8, and the other end of the eccentric connecting rod 8 is hinged on the middle section of the balance 4, and the opposite end of the balance 4 is hinged on the sewing machine casing 1 with the wire-passing end. The structure is simple, scientific and reasonable, the movement is stable, the thread passing pressure is smaller, the thread passing is smoother, and the precision is high, which greatly improves the operation rate and operability of the sewing machine, which is in line with industrial application.

Of course, the utility model has been described in detail above in conjunction with the embodiment, only to illustrate the technical concept and characteristics of the utility model, and its purpose is to let people familiar with this technology understand the content of the utility model and implement it. Equivalent changes or modifications made by the spirit of the new invention should all be covered within the protection scope of the present utility model.

Claims (3)

1. the sky flat structure of Sewing machines, include sewing machine case (1) and shank (2), it is characterized in that: in the upper additional balance holder (3) of sewing machine case (1), the upper group of balance holder (3) is provided with balance (4) and tension disk (5), balance (4) is positioned at shank (2) top, and balance (4) swings up and down center and shank (2) center is in the same center line.

2. the sky flat structure of Sewing machines according to claim 1, is characterized in that: described balance (4) is driven by a crank (6) and swings up and down, and crank (6) is arranged on balance holder (3), is connected with drive coordination belt wheel (7) by rotating shaft.

3. the sky flat structure of Sewing machines according to claim 2, it is characterized in that: the eccentric hinged eccentric ratio (8) of described crank (6), eccentric ratio (8) other end is then articulated with on balance (4) stage casing, and one end opposing with crossing line end of balance (4) is hinged on sewing machine case (1).