Rotary type multi-arm shedding mechanism

Abstract

The invention discloses a rotary type multi-arm shedding mechanism, belonging to the technical field of textile machinery. The rotary type multi-arm-shedding mechanism comprises a main shaft, swing arms, eccentric discs, a spline disc, clutch claws arranged on the eccentric discs, a first signal swing arm, a second swing arm and an iron-absorbing swing arm, wherein one end of the first signal swing arm is composed of a first swing arm meshing face, and the other end of the first signal swing arm is composed of a first iron-absorbing swing arm contact pin; one end of the second signal swing arm is composed of a second swing arm meshing face, and the other end of the second signal swing arm is composed of a second iron-absorbing contact pin; and the iron-absorbing swing arm is arranged on an iron-absorbing swing arm shaft. The rotary type multi-arm-shedding mechanism is characterized in that the meshing face of the firs eccentric disc and the second eccentric disc are of the shape of a semi-circular-arc concave face, the meshing face of the first swing arm and the meshing face of the second swing arm are of the shape of a semi-circular-arc concave face, the radius of the semi-circular-arc concave face is identical to that of the semi-circular-arc concave face, in addition, a first distance from the meshing face of the first eccentric disc to the rotation axis of a main shaft is identical to a second distance from the meshing face of the second eccentric disc to the rotation axis of the main shaft. The rotary type multi-arm-shedding mechanism has the advantages of contributing to guaranteeing a shedding action effect and saving energy and ensuring the quality of textiles.

Description

technical field [0001] The invention belongs to the technical field of textile machinery, in particular to a rotary multi-arm opening mechanism . Background technique [0002] The dobby mechanism is one of the opening parts of the loom that converts the pattern signal of the fabric into the opening action and drives the heald frame of the loom to lift the heald up and down. Arm mechanism and active dobby mechanism. [0003] The so-called passive dobby mechanism, its main components such as the broach, push knife and pull hook are shown as reciprocating motion, and the heald is returned in the form of a spring. However, with the widespread use of shuttleless looms, especially the continuous increase in the speed of looms, the negative dobby mechanism not only consumes a lot of kinetic energy due to the impact of motion inertia, but also cannot guarantee the smooth and high-speed movement of the loom, such as reciprocating motion. Inertial impact forces can cause severe...

AI Technical Summary

Problems solved by technology

[0007]However, since the rotary multi-arm shedding mechanism is usually used in harsh occasions with high speed, heavy load and humid environment, and is in the state of continuous work around the clock, that is, 24 hours, Therefore, how to prevent and / or avoid the wear and tear of the moving parts as much as possible is not only a technical issue concerned by the manufacturers of the rotary dobby shedding mechanism, but also a problem for the manufacturers of looms supporting the rotary dobby shedding mechanism and even the use of looms. It is an important factor that users are most concerned about, because the wear and tear of moving parts can lead to fabric weaving flaws, and can shorten the service life of the rotary dobby mechanism, which is one of the opening parts of the loom.

However, the above-mentioned patents have the disadvantage of taking care of one and losing the other. The so-called consideration of this means that it contributes to the reduction of energy consumption and noise, which are easily overlooked by people. The wear of the inner bearing surface of the child is not biased, because, in the actual use process, the aforementioned energy-saving and noise-reducing effect and the latter's troubles caused by wear (the rotary dobby shedding mechanism has a short service life and causes the loom to weave Efficiency loss and fabric defects) outweigh the gains

[0008] According to the technical content disclosed by CN1057352C, it can be seen that when the disc rotates, the rotating arm engaged with the first coupling surface of the eccentric disc passively opens outwards, and when the disc is opened During the process, there is sliding wear between the two. If the machine is turned on continuously at a speed of 1000r / min and has an average action probability of 50%, the eccentric disc moves 72,000 times a day, and a pair of alternately moving arms each performs 36,000 times, so it does not take long , the eccentric disk and the rotating arm are all damaged; in the process of swinging both the eccentric disk and the rotating arm, since the contact surface of the latch of the rotating arm and the eccentric disk is in a point contact form similar to W shape (Figure 4 and Figure 5), so the contact point appears as a jump Type conversion, jumping conversion will make the action lose coherence, which will aggravate the uneven wear of the joint surface; due to the limitation of the compact rotary dobby opening mechanism and the aforementioned W-shaped contact form, the actual effective contact area It is very small, about 2×2㎜ (4㎜ 2 ), and because the tension of the spring connected to the rotating arm is usually above 50N, and a large motion impact is superimposed, it is difficult to rely on The aforementioned point contact bears the tension of the spring and the accompanying movement impact, which makes the wear more serious

Ultimately, the rotary dobby shedding mechanism must be required to have a strict but practically difficult angular positioning accuracy. If the above-mentioned wear and tear accumulates to a certain extent, it will inevitably cause shedding movement errors, and the quality of the fabric cannot be guaranteed.

[0009] Therefore, how to find a reasonable balance between energy saving and noise reduction and avoiding wear and tear has long been a technical problem that the industry pays attention to and expects to solve. However, no corresponding revelation has been given in published patents and non-patent literature

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