Working principle of mechanical jacquard machine

Jacquard machine

The highest achievement of ancient weaving technology - Jacquard machine

The jacquard craft method originated from the original waist loom, which was used in the Han Dynasty Already used on bias looms and horizontal looms. Usually, one heddle (foot pedal) is used to control one heddle (a device for lifting warp threads) to weave patterns. In order to weave patterns, the number of heald frames must be increased. Two heald frames can only weave plain weave. 3- -Twill weave can be woven with 4 heald frames, and satin weave can be woven with more than 5 heald frames. Therefore, in order to weave complex flowers with large flower-shaped loops, the warp yarns must be divided into more groups, and a flower machine with multiple heddles and multiple crotches is gradually formed. According to "Miscellaneous Notes of Xijing", there is a loose flower damask woven by the wife of Chen Baoguang, a Julu man, with "one hundred and twenty machines." It is very cumbersome to weave so many damasks. By the time of the Three Kingdoms, Ma Jun "lost the old damask machine" In the "Japanese Silk Machine Change", the sixty-heddle quilting was changed to the twelve-heddle quilting, and the jacquard method of bunching the heddles was adopted, which not only facilitated the operation but also improved the efficiency. The flower-style jacquard machine appeared in the Eastern Han Dynasty, also known as the flower tower. It is the representative of the highest achievement of ancient Chinese weaving technology. It uses a thread pattern book to store the jacquard program, and then uses a straight line to pull the warp opening. The pattern book is a set of programs for storing pattern information on the jacquard machine. It is woven from the leg threads representing the warp threads and the ear threads representing the weft threads according to the pattern requirements. When getting on the machine, the foot line is connected to the fiber thread that lifts the warp. At this time, pulling the foot line on one side of the ear line can lift the relevant warp. When weaving, two people work together, one is the flower puller, sitting on the three-foot-high flower tower to pull the flowers and lift the heddle, and the other is stepping on the pole to insert the weft and weave. In "Ode to a Machine Woman" written by Wang Yi of the Eastern Han Dynasty, "a slender and quiet woman, with meridians and meridians, undulating and multifaceted, with a pitched posture" is used to describe the scene where the weaver and the jacquard worker cooperate to operate the jacquard machine. Jacquard looms were later introduced to the West via the Silk Road, which inspired the invention of program control and storage technology in the development of modern electronic computers.

Jacquard machine operating procedures

1. During maintenance, you must first press the two red stop buttons on the left and right, indicating that the machine is in the process of maintenance.

2. It is strictly prohibited to cross the guardrail, go up and down the stairs slowly and carefully, and be careful of slipping.

3. It is strictly prohibited to detach the horizontal bars of the bridge with pattern plates, hang them on the gantry ground at will and cause them to roll down, which may injure the equipment and workers.

4. Tools must not be placed randomly to prevent them from falling during operation and causing accidents.

5. When the safety baffle is moved due to maintenance needs, it should be restored to its original position in time after the maintenance is completed.

6. When starting up the machine after maintenance, you should first perform slow operation for more than 2 wefts, confirm that it is normal before proceeding with express operation, confirm that the cloth quality is normal, and the equipment can run normally before leaving the maintenance machine.