Textiles: weaving – Pattern mechanism – Cylinder motions
Patent
1982-11-12
1984-12-25
Kee Chi, James
Textiles: weaving
Pattern mechanism
Cylinder motions
139 68, 139331, D03D 4900, D03C 114, D03C 1300
Patent
active
044897634
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a leveling device which is used to equalize level of all warps moved in shedding motion by a dobby machine installed on a loom.
2. Background Art
In general, when a heald frame is installed to a dobby machine in a weaving preparation step or warp is passed through a heald in the installed heald frame or warp being cut during the weaving work is connected, operation to equalize level of all heald frames, that is, leveling operation is performed so as to facilitate the work.
A leveling device in dobby machines is usually constituted so that a card cylinder is moved away from or close to a fish-lever. In a dobby machine, an endless card wrapped around the rotating card cylinder is provided with pegs planted thereon corresponding to fabric pattern, and when the card cylinder is in normal working attitude the heald frame connected to the fish-lever instructed by the peg solely rises and other heald frames remain in falling position. Thereby if the card cylinder is moved away from the fish-lever, i.e. in the leveling attitude, command from the peg is not delivered to the fish-lever irrespective of existence of the peg. Accordingly, all heald frames remain in the falling position and level of all warps is equalized thus the leveling is effected.
Mechanism to transfer position of a card cylinder is usually constituted in that base portion of a card cylinder bracket is fixed to a rocking shaft supported by a machine frame, a shaft of a card cylinder is supported by a bearing formed on the top end of the card cylinder bracket, and the card cylinder bracket is rocked and transferred between the working attitude and the leveling attitude.
In such device of prior art, following mechanism is used in order to transfer the card cylinder bracket between the working attitude and the leveling attitude and to hold it in the corresponding position. In this mechanism, a lever is fixed to the rocking shaft, the cylinder bracket is rocked by operating the lever, and the lever is provided with notch means thereby the lever is held in a prescribed position by the notch means. In the above mentioned device, however, since urging force supplied at the fish-lever is delivered through the peg to the card cylinder, it has disadvantages in that large force is required for rocking operation of the lever and operation for engaging or detaching the notch is complicated and troublesome.
DISCLOSURE OF INVENTION
This invention relates to a leveling device which is constituted in that a card cylinder is supported to a bearing formed at the top end of a card cylinder bracket, base portion of the card cylinder bracket is pivotally attached to a machine frame, and the card cylinder bracket can be rocked between working attitude in which the fish-lever is acted by a peg planted on a card wrapped around the card cylinder and leveling attitude in which the fish-lever is not acted by the peg being away from the position, wherein the card cylinder bracket is urged into the leveling attitude by urging means such as a spring, a cam or a crank arm which is pivotally attached to the heald frame near the card cylinder acts on the bearing of the card cylinder bracket to move it and co-operates with the urging means so as to hold the card cylinder bracket in the working attitude and the leveling attitude.
An object of this invention is to provide a leveling device which can be operated by small force. Another object of this invention is to provide a leveling device in which notch means is not required.
Above-mentioned and other objects and features of this invention will be apparent from the following description referring to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front view illustrating a first embodiment of this invention; and
FIG. 2 is a front view illustrating a second embodiment of this invention.
BEST MODE FOR CARRYING OUT THE INVENTION
First Embodiment (FIG. 1)
A rocking shaft 1 is rotatably supported to a machine frame (not shown). A base portion 3 for
REFERENCES:
patent: 3951176 (1976-04-01), Koyama
Chi James Kee
Yamada Dobby Co., Ltd.
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