Weaving shed opening mechanism for negative dobby

Abstract

The invention discloses a weaving shed opening mechanism for a negative dobby, and belongs to the technical field of textile machinery. The weaving shed opening mechanism comprises a first rotating arm, a first adjusting lever, a first shedding arm, a first pulling rope, a second pulling rope, a first redirecting pulley, a second redirecting pulley, a heald frame, a first heald returning rope, a second heald returning rope, a first heald returning arm, a second heald returning arm, and a first heald returning spring, and a second heald returning spring. The weaving shed opening mechanism is characterized by also comprising a second rotating arm, a second adjusting lever, a second shedding arm, a pulling rope transition device and a third pulling rope. Due to the addition of the second rotating arm, the second adjusting lever, the second shedding arm, the third pulling rope and the pulling rope transition device, the technical scheme of the invention can meet the requirement on two weaving sheds needed by a weaving machine for weaving double woven fabrics, has simple integral structure, and can improve the weaving shed opening mechanism for the negative dobby in the prior art.

Description

technical field [0001] The invention belongs to the technical field of textile machinery, and in particular relates to a weaving shed opening mechanism of a passive dobby. Background technique [0002] The concept about the dobby has long been seen in documents such as Chinese patent documents. As the Chinese invention patent application publication number CN1186879A introduces a rotary electronic dobby, the so-called rotary electronic dobby is driven by the motion of the cam to provide When the heald arm moves, the shed connecting rod is moved by the heald lifting arm, and then the heald frame is moved by the shed connecting rod to form the weaving shed of the loom. The concept of the so-called negative type is also well known in the industry, that is, the reset of the heald frame needs to be reset by means of the return heald spring, so it is called the negative type, otherwise, it is called the positive type. [0003] As is well known in the textile industry, fleece fabr...

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Problems solved by technology

[0008] It can be seen from the above description that the weaving shed opening mechanism of the negative dobby with the above structure can only make the heald frame move from the lowest point to the highest point to form a single opening, but cannot make the heald frame move again in the opening between the highest point and the lowest point. Separate openings to form double openings, the final result is to restrict the weaving of double-layer fabrics such as the aforementioned pile fabrics on the loom

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