Thread take-up mechanism for sewing machine

Abstract

The invention provides a thread take-up mechanism for barbed cloth of a sewing machine, which comprises: a needle bar and a machine needle placed at the bottom end of the needle bar; a thread take-up assembly connected with the needle bar; The rotation shaft is provided with a revolution drive wheel and a first gear; the rotation sleeve shaft is sleeved on the revolution shaft and rotates freely relative to the revolution shaft, and one end of the rotation sleeve shaft is provided with a rotation drive wheel, and the other end of the rotation sleeve shaft is connected to two a second gear, the two second gears are meshed with the first gear; the coaxially sleeved transmission ring gear, the transmission ring gear is meshed with the two second gears; the third gear and the sixth gear set by rotation gear, and the fifth gear and the fourth gear sleeved on the revolution shaft, the fifth gear and the sixth gear are fixedly connected; the third gear meshes with the transmission ring gear and the fourth gear respectively, and the fifth gear and the sixth gear The gears are meshed, and the sixth gear is connected with the thread take-up shaft transmission. The invention can simultaneously realize the revolution and rotation of the thread take-up assembly by driving the revolution shaft and the rotation sleeve shaft.

Description

technical field [0001] The invention relates to the technical field of sewing machines, in particular to a needle cloth thread take-up mechanism of a sewing machine. Background technique [0002] According to whether the axis position of the upper and lower axes of the sewing machine changes, the sewing machines currently on the market can be divided into two categories. The first category is the rotation of the upper and lower shafts, but the axis that drives the rotation of the thread take-up assembly does not move. At present, most models belong to this category, such as lockstitch sewing machines and template machines. The advantage of this structure is that the structure is simple and the cost is low; the disadvantage is that because the axis that drives the thread take-up assembly to rotate itself is fixed, the stitches in the reverse direction or close to the backward direction are inconsistent with the stitches in the forward direction, resulting in unsightly sewing ...

AI Technical Summary

Problems solved by technology

But this technology also has an obvious shortcoming: the upper section of the sewing machine, that is, the pricking cloth thread take-up mechanism, and the lower section hooking mechanism are separated from each other in mechanical structure, that is, the axis of its revolution shaft is fixed, but the axis of its rotation input shaft The position is changing, so it is impossible to connect the rotation of the upper shaft in the upper section (needling thread take-up mechanism) with the rotation of the lower shaft in the lower section (thread hooking mechanism) mechanically. At high speed, only high-precision The servo motor and its control system are used to realize the synchronization of the needle bar and the thread catcher, so the stability of this technology depends heavily on the stability of the electric control system

At present, in order to ensure stable performance, it is necessary to use high-quality (such as imported) electronic control systems, resulting in high prices for the whole machine; if you want to improve the cost performance, you can only use general-quality electronic control systems, but in this way, the performance of the machine will be reduced. affected

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