Textiles: spinning – twisting – and twining – Apparatus and processes – Doffing or donning
Patent
1982-07-01
1984-03-27
Petrakes, John
Textiles: spinning, twisting, and twining
Apparatus and processes
Doffing or donning
294 87R, 294 93, 294 99R, D01H 900, B66C 146
Patent
active
044386230
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a new and improved gripper apparatus on a ring spinning or ring twisting machine for gripping empty and/or wound-on bobbin tubes using pegs arranged on a beam extending along the machine, which pegs can be inserted, by suitably moving the beam, into the cylindrical interior spaces of the bobbin tubes, one peg being provided for each bobbin tube, and the pegs being tapered-off at their front end, which is inserted, in which arrangement the gripped bobbins are held by mutually pressing a bobbin tube and a peg inserted into its interior space against each other.
In textile processing, bobbin tubes or bobbin packages in various operations are gripped automatically to be transported from one location to another. As known e.g. from German Pat. No. 1,282,526 and from Swiss Pat. No. 500,303, particularly on ring spinning or ring twisting machines in many cases a plurality of such bobbin tubes or of bobbin packages, respectively, is to be gripped simultaneously. For this purpose gripper devices, arranged on a beam, are inserted into the cylindric interior spaces of the bobbin tubes or of the bobbin packages, respectively, and by pressing these gripper devices and the bobbin tube inside wall against each other, the bobbin tubes are gripped.
In this type of gripping of the bobbin tubes or the bobbin packages cases occur more or less frequently, in which one of the gripper devices is not inserted correctly into the cylindrical interior space of the bobbin tube. This disadvantage is due, if a plurality of bobbin tubes is to be gripped simultaneously, to inaccurate positioning of one of the bobbin tubes, the probability of such inaccurate positioning increasing with the number of bobbin tubes to be gripped simultaneously. For still achieving correct insertion of the gripper device into a bobbin tube even in case the latter is somewhat inaccurately positioned, it is known that the front end of the gripper device, which is to be inserted into the interior space of the bobbin tubes, is tapered-off conically.
This measure improves the conditions. However, the case can still occur, in which the point of the tapered-off front end of the gripper device, to be inserted into the bobbin tube, collides with the upper rim of the bobbin tube head-on. In this case, if pegs of hard material are used, the bobbin tube, the peg or even the beam for the gripper devices, or the elements guiding and moving the beam respectively, can be damaged; on inflatable, bendable gripper devices cracks can develop, in such manner, that these gripper devices have to be replaced. Due to such cracks furthermore the compressed air required for inflating the gripper devices escapes, which can cause prolonged down time. Such damages thus can be of serious nature.
SUMMARY OF THE INVENTION
Therefore, with the foregoing in mind it is a primary object of the present invention to provide an improved construction of gripper apparatus on a ring spinning or on a ring twisting machine which is not associated with the aforementioned limitations and drawbacks of the prior art constructions.
Now in order to implement this and still further objects of the invention, which will become more readily apparent as the description proceeds, the gripper apparatus of the present development is manifested by the features that each peg is provided with a cylindrical extension made from elastically bendable material, which extends from the tapered-off front end of the peg towards the front.
If, due to misaligned, faulty position of a bobbin, a head-on collision of a front end of a peg on the upper bobbin tube rim would occur, in the arrangement according to the invention the front end of the extension collides with this bobbin tube rim. As the insertion movement proceeds, the extension and subsequently the peg slides along the bobbin tube rim, the bobbin tube being pushed to the side in such a manner that damages are avoided. In this process the peg colliding with the bobbin tube rim either is inserted into the bobbin
REFERENCES:
patent: 3327450 (1967-06-01), Carter
patent: 3367098 (1968-02-01), Schulz
patent: 3462934 (1969-08-01), Schulz et al.
patent: 3667204 (1972-06-01), Burgermeister et al.
patent: 3714770 (1973-02-01), Rothke
patent: 3835633 (1974-09-01), Klein
patent: 3945486 (1976-03-01), Cooper
patent: 4173368 (1979-11-01), Haverbusch
Kleeman Werner W.
Petrakes John
Rieter Machine Works Ltd.
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