Automatic differential adjusting mechanism

Abstract

The utility model discloses an automatic differential adjusting mechanism which comprises a stepping motor installed on the rear portion of a machine head of a sewing machine, a power output shaft of the stepping motor is connected with a swing rod, a U-shaped groove is formed in the lower end of the swing rod, and the U-shaped groove is movably matched with a driving bearing on a differential connecting rod. According to the automatic differential adjusting mechanism, the working position of the differential connecting rod can be controlled in real time through the stepping motor, the differential value of the feed dog can be automatically adjusted in the sewing process, and cloth has the most appropriate tension degree in the sewing process.

Description

Technical Field

[0001] The utility model relates to the field of industrial sewing machines, in particular to an automatic differential adjustment mechanism for overlock sewing machines. Background Art

[0002] Patent No. 202221989553.0 discloses a feed dog spacing adjustment mechanism for an overlock sewing machine, comprising an adjustment shaft mounted within an overlock sewing machine base, one end of the adjustment shaft being connected to a fork-shaped member, and the other end being connected to an adjustment rod via a connecting plate; the adjustment rod extending from the top surface of the overlock sewing machine base and connected to a handle; the handle being slidably mounted within a handle slot of a handle locking plate. This patent disclosure has certain drawbacks: the feed dog differential value must be adjusted manually and cannot be automatically adjusted during operation, resulting in low efficiency and quality. Summary of the Invention

[0003] In view of the above technical problems, the present invention provides an automatic differential adjustment mechanism, which can automatically and in real time adjust the differential value of the feed dog according to sewing requirements during the sewing process, thereby improving the sewing quality.

[0004] The present invention solves the above-mentioned technical problems by adopting a technical solution: an automatic differential adjustment mechanism comprising a stepper motor mounted at the rear of a sewing machine head, the power output shaft of the stepper motor being connected to a rocker arm, the lower end of which is formed with a U-shaped groove that flexibly engages with a drive bearing on a differential link. A connecting rod is mounted at the upper end of the differential link, the inner race of the drive bearing being fixedly connected to the differential link via the connecting rod, and the outer race of the drive bearing engaging with the U-shaped groove.

[0005] In order to optimize the above technical solution, the present invention also includes the following improved technical solution.

[0006] A support base is mounted on the upper rear end of the sewing machine head, and the stepper motor is fixedly mounted on the support base via a stepper motor mounting plate.

[0007] The stepper motor mounting plate is equipped with a position sensor for detecting the zero point position of the rocker arm.

[0008] Compared with the existing technology, the automatic differential adjustment mechanism of the utility model can control the working position of the differential link in real time through the stepping motor, and can automatically adjust the differential value of the feed dog during the sewing process, so that the fabric has the most appropriate tension during sewing. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model.

[0010] Figure 2 It is a three-dimensional structural diagram of the utility model.

[0011] Figure 3 yes Figure 2 Explosion diagram. DETAILED DESCRIPTION

[0012] The embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

[0013] Figures 1 to 3 Shown is a schematic structural diagram of the present utility model.

[0014] The reference numerals are: stepper motor 2 , stepper motor mounting plate 3 , connecting rod 12 , driving bearing 13 , limit plate 14 , differential link 15 , position sensor 19 , support base 20 , and rocker arm 21 .

[0015] The automatic differential adjustment mechanism of the present invention includes a stepper motor 2, a rocker arm 21, a limit plate 14, and a differential link 15. During sewing, the stepper motor 2 drives the differential link 15 to rotate via the rocker arm 21, controlling the working position of the differential link 15 and adjusting the differential value of the feed dog in real time.

[0016] like Figure 1 As shown, a support base 20 is mounted on the upper rear end of the sewing machine head. A stepper motor 2 is mounted on the support base 20 via a stepper motor mounting plate 3. The drive shaft of the stepper motor 2 is connected to the upper end of a rocker arm 21, the lower end of which is formed with a U-shaped groove. A swingable differential link 15 is mounted on the rear of the sewing machine head. The lower end of the differential link 15 is rotatably connected to a rotating shaft inside the sewing machine head. The upper end of the differential link 15 is mounted on a connecting rod 12. A drive bearing 13 is mounted on the connecting rod 12. The inner ring of the drive bearing 13 is fixedly connected to the differential link 15 via the connecting rod 12, and the outer ring of the drive bearing 13 engages with the U-shaped groove.

[0017] The driving shaft of the stepping motor 2 can drive the swing rod 21 to swing around the center of the driving shaft of the stepping motor 2. The swing rod 21 drives the connecting rod 12 to swing through the driving bearing 13, and the connecting rod 12 drives the differential link 15 to rotate along the arc groove of the limit plate 14.

[0018] When the overlock sewing machine is working, at different positions of the fabric, according to the requirements of fabric tensioning, by controlling the rotation angle of the stepper motor 2, the working position of the differential link 15 is adjusted, and the differential value can be adjusted in real time, so that the fabric has different sewing effects at different positions, thereby improving the sewing quality.

[0019] A position sensor 19 is mounted on the stepper motor mounting plate 3. When the rocker arm 21 rotates, the position sensor 19 detects the rotation and records the position, which facilitates the stepper motor 2 to find the zero.

[0020] The best embodiment of the present invention has been described, and various changes or modifications made by ordinary technicians in this field will not depart from the scope of the present invention.

Claims

1. An automatic differential adjustment mechanism, characterized by: The invention comprises a stepper motor (2) installed at the rear of a sewing machine head, a power output shaft of the stepper motor (2) connected to a rocker (21), a U-shaped groove formed at the lower end of the rocker (21), and the U-shaped groove movably matched with a driving bearing (13) on a differential link (15); a connecting rod (12) is installed at the upper end of the differential link (15), the inner ring of the driving bearing (13) is fixedly connected to the differential link (15) through the connecting rod (12), and the outer ring of the driving bearing (13) matches with the U-shaped groove.

2. The automatic differential adjustment mechanism according to claim 1, characterized in that: A support base (20) is mounted on the upper rear end of the sewing machine head, and the stepping motor (2) is fixedly mounted on the support base (20) via a stepping motor mounting plate (3).

3. The automatic differential adjustment mechanism according to claim 2, characterized in that: The stepping motor mounting plate (3) is equipped with a position sensor (19) for detecting the zero point position of the rocker (21).

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