Textiles: fiber preparation – Working – Combing
Patent
1993-06-18
1994-11-29
Crowder, Clifford D.
Textiles: fiber preparation
Working
Combing
242563, 2425645, 2425951, D01G 1908
Patent
active
053677463
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for feeding a lap which can be wound off from a lap roll to a combing unit of a comber.
With known combers, as can be seen in CH-PS 625 564 e.g., the lap to be combed out is fed to the comber in the form of a lap roll. During the winding off of the lap, the lap roll is placed on two lap rollers, of which at least one is driven. The winding off of the lap from the lap roll takes place before the front lap roller. The lap wound off in such a manner reaches via a feed roller into the nip of a nipper jaw and is combed out at its front end, which extends past the nipper jaw, with the nipper jaw closed by way of a comb cylinder arranged below the nipper jaw. Following the combing out process, the nipper jaw is opened again and the combed out fiber tuft is transferred to a subsequent detaching roller pair. During this detaching process, a top comb inserted into the fiber tuft to be detached can effect an additional combing effect. During the combing process, the nipper jaw effects a to and fro movement. In order to enable a simpler joining of a new lap, the driven lap roller is disconnected from the drive by a coupling so that both lap arbours are freely turnable.
European Patent Application 03 60 064 describes a comber in which a front lap roller is driven by a separate driving motor which is triggered by a control unit. This control unit has the task to chronologically harmonize the controls of the separate driving motor for the feed rollers, the drive for the lap arbour as well as the drive for the nipper jaw, the comb cylinder and the detaching roller.
The lap roll rests freely on the two lap rollers with its entire weight (20-25 kg). As a result, an indentation is created in the roll in relation to its circumferential diameter based on the elasticity of the lap. After passing the resting place, the lap expands to its original diameter minus the thickness of a lap layer. With a decreasing lap diameter and hence decreasing weight, this indentation depth decreases. In order to ensure a better carrying, the lap rollers are toothed.
The circumferential speed of the lap is greater on its circumferential diameter than the circumferential speed in the area of the least distance between the center axis of the lap and the resting surface i.e. a contact surface roller. This results in that the more the diameter and hence the weight of the lap decreases, the smaller the indentation depth, and hence also the penetration of the lap into the toothing, and the difference between the circumferential speed in the area of its external diameter and the circumferential speed in the area of the least distance between center axis of the lap and the contact surface of the lap roller. Based on these different speed relationships, a different feeding speed of the lap can result depending on the diameter or weight of the lap roll. In addition to the described influence of the changed indentation depth on the supplying speeds of the lap, with decreasing lap weight the changed dynamic interaction between the intermitting drive of the feed roller and the constant drive of the lap roller also influences the changing of the supplying speed during the winding-off process of a lap roller. By way of the mentioned influences, the tension draft of the lap changes between the lap roller and the feed roller during the winding-off process.
From this results, as investigations have shown, that at the beginning of the winding off process, the combing aggregate is fed a thicker lap for combing out than toward the finish of the lap roll.
This deviation is generally termed as drift and may be of up to 5%, depending on the structure of the lap roll, material and other parameters.
A separate drive for the lap rollers, which is controlled by a control device, is also shown in Swiss Application No. 140/90, filed Jan. 17, 1990. The control of the separate drive for the lap rollers is here necessary for the joining process of a new lap in the nipper jaw of the comber. A continuous adjustment of the lap roller drive during th
REFERENCES:
patent: 4496112 (1985-01-01), Olsson et al.
patent: 4535949 (1985-08-01), Olsson
patent: 4817883 (1989-04-01), Hoffmann et al.
patent: 5027475 (1991-07-01), Mondini et al.
patent: 5077865 (1992-01-01), Mondini et al.
patent: 5095586 (1992-03-01), Wust et al.
patent: 5230125 (1993-07-01), Clement et al.
Clement Heinz
Eichengerger Hansulrich
Wuest Oliver
Calvert John J.
Crowder Clifford D.
Hand Francis C.
Rieter Machine Works Ltd.
LandOfFree
Drive for a comber does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Drive for a comber, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drive for a comber will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-66690