Device for adjusting the work gap between the points of flat clothings and the points of the cylinder clothing of a card

Abstract

The invention relates to a device for adjusting the work gap between the points of flat clothings and the points of the cylinder clothing of a card, whereby the flat bars provided with clothings are led across a partial area of the drum circumference on both sides of the card on respective, convex bent sliding guides, and whereby their sliding surfaces with regard to the drum axis of rotation are being radially adjustable. Each sliding guide has the form of a sandwich type design with a radially inner support which can also be divided into individual supporting sections, and into a radially outer, continuous flex bend, whereby between the flex bend and the radially inner support a centre core is provided which is provided with one or several adjusting elements.

1 . Device for adjusting the work gap between the points of flat clothings ( 44 ) and the points of the cylinder clothing ( 68 ) of a card ( 10 , whereby the flat bars ( 40 ) provided with clothings are led across a partial area of the drum circumference on both sides of the card on respective, convex bent sliding guides ( 100 ), and whereby their sliding surfaces ( 112 ) with regard to the drum axis ( 62 ) of rotation are being radially adjustable, characterized in that each sliding guide ( 100 ) is of a sandwich type design, with a radially inner support ( 102 ) which can also be divided into individual supporting sections ( 102 A), and with a radially outer, continuous flex bend ( 104 ), whereby a centre core ( 106 ) is being furnished between the flex bend ( 104 ) and the radial inner support, and whereby said centre core is being provided with one or more adjusting elements ( 108 ;  116 ;  124 ;  146 ;  160 ;  160 A;  180 ;  190 ;  200 ;  218 ,  220 ,  222 ;  240 ,  242 ).  
     
     
         2 . Device according to  claim 1 , characterized in that on each side of the card the radially inner support ( 102 ) or the discrete supporting sections ( 102 A) respectively, is/are rigidly designed and rigidly connected with the respective side part of the card.  
     
     
         3 . Device according to one of the preceding claims, characterized in that the adjusting element is designed as piezoelement ( 108 ;  116 ).  
     
     
         4 . Device according to  claim 3 , characterized in that the piezoelement ( 108 ) extends at least basically over the entire length of the flex bends ( 104 ) and if necessary it is designed in multiple layers.  
     
     
         5 . Device according to one of the  claims 1  to  4 , characterized in that on each side of the card several adjusting elements ( 116 ) are furnished which have the form of separately or commonly controllable piezoelements being arranged next to each other.  
     
     
         6 . Device according to one of the claims  1  or  2 , characterized in that the adjusting element or each of the adjusting elements is realized as pneumatically operating element ( 124 ;  146 ).  
     
     
         7 . Device according to  claim 6 , characterized in that the pneumatically operating element ( 124 ) has the form of a cushion element which is expandable with air pressure and which expands elastically depending on the applied air pressure and shrinks again through reduction of the applied air pressure.  
     
     
         8 . Device according to  claim 6 , characterized in that the pneumatically operating element ( 146 ) is formed at least partly by the radially inner support ( 102 ) and by the flex bend ( 104 ).  
     
     
         9 . Device according to  claim 8 , characterized in that an oblong groove ( 136 ) is provided in one of the radially inner supports ( 102 ) and the sliding guide ( 104 ) into which projects a tongue ( 138 ) of the respective other part and thus forms a chamber ( 144 ) which is locked at the ends.  
     
     
         10 . Device according to  claim 8  or  9 , characterized in that the pneumatically operating element has the form of a flexible hose ( 146 ) which lies within an oblong cavity ( 144 ) which is formed between the radially inner support ( 102 ) and the sliding guide ( 104 ) and which extends itself along the sliding guide ( 104 ).  
     
     
         11 . Device according to  claim 10 , characterized in that the side cheeks of the oblong groove ( 136 ) serve as radial guidance for the sliding guide ( 104 ).  
     
     
         12 . Device according to one of the claims  1  and  2 , characterized in that on each side of the card the adjusting element consists of a thermal expansion element ( 160 ;  160 A).  
     
     
         13 . Device according to  claim 12 , characterized in that the thermal expansion element ( 160 ) has the form of a corrugated heatable sheet metal strip, whose ends are fastened (at  168 , 170 ).  
     
     
         14 . Device according to  claim 12 , characterized in that the thermal expansion element ( 160 ;  160 A) is designed as bimetallic strip.  
     
     
         15 . Device according to claim x, characterized in that on both sides of the card several heat expanding elements ( 160 A) are provided each of which consists of one bimetallic strip.  
     
     
         16 . Device according to  claim 15 , characterized in that the bimetallic elements ( 160 A) are leaf-spring-type and are being inserted between the radially inner support ( 102 ) and the respective flex bend ( 104 ).  
     
     
         17 . Device according to one of the  claims 1  to  2 , characterized in that on each side of the card several adjusting elements are provided which are designed as respective spring elements ( 180 ;  190 ).  
     
     
         18 . Device according to  claim 17 , characterized in that the spring elements ( 180 ;  190 ) are designed as compression spring elements.  
     
     
         19 . Device according to claims  17  or  18 , characterized in that the spring elements consist of individual leaf springs ( 180 ).  
     
     
         20 . Device according to one of the claims  1  or  2 , characterized in that on each side of the card an adjusting element is provided in the form of a spring element made of polyurethane ( 200 ) which extends as strip element along the radially internal side of the flex bend ( 104 ) and which is located between said flex bend and the radially inner support ( 102 ).  
     
     
         21 . Device according to one of the preceding claims, characterized, by a device for adjustment of the pre-tension of the driving belt ( 48 ) or the driving chain respectively, for the revolving flat ( 18 ), in order to change this tension based on the radial position of the spring-loaded flex bends.  
     
     
         22 . Device according to one of the preceding claims, characterized by one or several devices for applying radially inward directed forces on each of the flex bends.  
     
     
         23 . Device according to one of the preceding claims, characterized in that between each flex bend ( 104 ) and the thereto assigned radially inner support ( 102 ) friction absorber ( 148 ,  150 ) are provided.  
     
     
         24 . Device according to one of the preceding claims, characterized in that on each side of the card a groove ( 136 ) is provided, extending in the direction of the sliding guide, either within the radially inner support ( 102 ) or within the flex bend ( 104 ) into which projects a tongue section ( 138 ) of the respective other element, i.e. said tongue section of the flex bend ( 104 ) or said tongue section of the radially inner support ( 102 ) respectively, whereby the friction absorbers ( 148 ,  150 ) come into effect between the cheeks of the groove ( 136 ) and the opposing tongue section ( 138 ).  
     
     
         25 . Device according to  claim 24 , characterized in that the friction absorbers ( 148 ,  150 ) have the form of a friction lining on the cheeks or on the tongue section respectively.  
     
     
         26 . Device according to one of the  claims 1  to  2 , characterized in that on each side of the card the adjusting element is designed as electromagnetically operating element ( 220 ).  
     
     
         27 . Device according to  claim 26 , characterized in that each electromagnetically operating element consists of an element ( 220 ) being shiftable into a wedge gap in magnetic or electromagnetic manner.  
     
     
         28 . Device according to one of the claims  1  or  2 , characterized in that each flex bend ( 104 ) and the radially inner support ( 102 ) assigned to them are equipped with magnetic devices ( 240 ,  242 ) which together form an adjustment device, whereby the flex bend floats magnetically in pre-determinable spaces above the radially inner support ( 102 ).  
     
     
         29 . Device according to  claim 28 , characterized in that spring elements are being provided between each flex bend ( 104 ) and the respective radially inner support ( 102 ) assigned to said flex bends.  
     
     
         30 . Device according to  claim 28  or  29 , characterized in that the magnetic devices on the flex bend ( 104 ) are permanent magnets ( 240 ) while the magnetic devices being assigned to the radially inner support ( 102 ) are electromagnets ( 242 ).  
     
     
         31 . Device according to  claim 28  or  29 , characterized in that the magnetic devices on the flex bend ( 104 ) are electromagnets ( 242 ) while the magnetic devices on the radially inner support ( 102 ) assigned to said flex bend are permanent magnets ( 240 ).  
     
     
         32 . Device according to  claim 28  or  29 , characterized in that the magnetic devices on the flex bend ( 104 ) and the radially inner support ( 102 ) assigned to said flex bend each consist of electromagnets ( 242 ).  
     
     
         33 . Device according to one of the  claims 28  to  32 , characterized in that the magnetic devices on each flex bend ( 104 ) and on the radially inner support ( 102 ) assigned to said flex bend are polarized repulsing or attracting, whereby in case of the application of the attracting type of layout, spring elements according to  claim 29  are to be provided.  
     
     
         34 . Device according to one of the preceding  claims 28  to  33 , characterized in that a device ( 114 ) is provided for controlling of the amperage through the electromagnets ( 242 ).  
     
     
         35 . Device according to one of the preceding claims where several adjusting elements on each side of the card are provided and distributed over the length of the flex bend, characterized in that the adjusting elements are controllable together or individually.