Textiles: manufacturing – Warp preparing or handling – Reeling or beaming
Patent
1991-04-17
1993-05-04
Crowder, Clifford D.
Textiles: manufacturing
Warp preparing or handling
Reeling or beaming
28191, D02H 900, D02M 1334
Patent
active
052069761
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an automatic shedding mechanism in which the shedding operation in a warping machine is automated, and an electronically controlled sectional warping machine employing the automatic shedding mechanism.
2. Description of the Related Art
With a conventional warping machine, the shedding operation has been carried out by manually moving a closed reed up and down, keeping warp yarns apart with lease rods to form lease, and passing lease cords through the lease. Since the shedding operation is very complicated and requires the operators' dexterity, it has been very difficult to automate the shedding operation. An example of an automatic warping machine is exemplified in the Japanese Patent Laid-Open Publication No. 118640/1989.
With the cited warping machine, the lease rods for passing lease cords into the lease are held by a gripper and are moved to a certain extent by the gripper. Therefore the warping machine should include the gripper and means for driving the gripper, which makes the machine complicated in a controlling mechanism and in the overall structure. In addition, the operation speed of the machine is slow, and the machine becomes very expensive.
Therefore it is an object of this invention to completely automate the shedding operation under the electronic control by a computer. A second object of the invention is to provide an automatic shedding mechanism and an electronically controlled sectional warping machine, which are simple in the overall structure, are inexpensive, and have a fast operation speed.
SUMMARY OF THE INVENTION
According to the first aspect of this invention, there is provided an automatic shedding mechanism, which comprises a warping drum which is rotatably disposed on a bearing via a drum shaft and is rotated by driving means including an electronically controlled motor, a plurality of lease tapes which are conducted onto the surface of said warping drum via a lease tape guide and are moved between lease formed by warping yarns, a reel which is disposed on a side of said warping drum and includes means for reeling said lease tapes, and a movable unit which is moved back and forth by said electronically controlled driving means so as to come into contact with and out of contact from said lease tapes and said means.
Six lease tapes are used for the cut shedding down, first and second front shedding, cut shedding up, and first and second back shedding. The number of lease tapes depends upon the number of lease to be formed, and may be equal to, less or more than six.
The lease tapes are preferably flexible in the lengthwise direction, are difficult to bend in the widthwise direction, and are steel tapes having a thickness of 0.3 mm or less and a width of 50 mm or less. The lease tapes may be thin synthetic resin tapes. Since the lease tapes are flexible, they pass through the lease tape guide according to the shape of the lease tape guide. Further the lease tapes are difficult to bend in the widthwise direction, and do not bend laterally after passing through the lease tape guide. The lease tapes are so light in weight that they are not affected by their own centrifugal force when they are rotated together with the warping drum. Therefore the warping drum can be rotated at a high speed.
The lease tapes are let off by means of the frictional forces generated by the rotation of the lease tape feeding motor between the lease tapes and the rubber roll. The lease tapes may be let off by a rubber belt in place of the rubber roll.
The amount of the lease tapes to be let off is determined by the number of pulses applied to the electronically controlled motor, and can be also determined by detecting the position of the leading ends of the lease tapes by means of a sensor or the like.
The lease tapes have at their ends hooks with holes for hooking the lease cords. When the lease tapes having the lease cords hooked on their holes are moved backward, the lease cords are easily inserted into the lease.
Accordin
REFERENCES:
patent: 4683625 (1987-08-01), Baltzer
patent: 4765041 (1988-08-01), Baltzer
patent: 4831695 (1989-05-01), Baltzer
patent: 5027485 (1991-07-01), Hager et al.
Aihara Takatsugu
Hisano Soichiro
Crowder Clifford D.
Mohanty Bibhu
Suzuki Warper Ltd.
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