Patent EA-003723-B1 (EA)
Title: Device for continuous fabric take-down in a knitting machine
Inventor: BASEGGIO MARCELLO
IPC: D04B15/88
Filed: 2001-12-18
Abstract: 1. A device for continuous fabric take-down in a knitting machine with one or more needle holders (1, 2) consists of two elastic belts (5, 6) rotated in opposite directions by two horizontal shafts (7, 8) and passing over return members (10, 11) located close to the stitchforming zone and arranged on at least two rests (12, 13) supported by respective drive shafts providing pressing the belts (5, 6) to each other under the action of friction forces transferred to the rests by the drive shafts, characterized in that comprises means (14, 15; 21, 22) which allows the shape of the belts enveloping surfaces to be modified varying the pulling effort locally applied to the knitted material or stockinet. 2. The device according to claim 1, characterized in that the belt shape modification mechanism consists of pressure elements (21, 22) arranged on the rests exercising pressure on the belts locally increasing their tension and, consequently, the pressure upon the stockinet that is the pulling force. 3. The device according to claim 1, characterized in that the means of modification of the form of the tension belts enveloping surfaces increase the contact surface of at least one belts with stockinet. 4. The device according to claim 2 or 3, characterized in that at least one rest (12, 13) is segmented into a plurality of autonomous rests (12a-12g). 5. The device according to claims 1, 3 or 4, characterized in that the means of modification of the form of the tension belts enveloping surfaces is formed by at least one elongated body (21, 22) parallel to the drive shaft axis, the body is mounted on a rest (12) between the axis and the belt the length of which is equal to a certain fraction of the needle holder's length and which is adapted to move axially on rests, and means (17, 18, 23, 24) for displacing said bodies axially, wherein said bodies move the belts away from the rests thus changing the shape of the belts enveloping surfaces. 6. The device according to claim 5, characterized in that said bodies (21, 22) are mounted on the internal or external side of the rests. 7. The device according to claim 5 or 6, characterized in that each elongated body (21, 22) is mounted on endless screws (17, 18) between two nuts (19, 20) retained by rotation, the screws (17, 18) are individually driven by motors (23-26) providing an automatic displacement of said elongated bodies (21, 22) depending on definite knitting zone. 8. The device according to claim 7, characterized in that the elongated bodies (21, 22) are rollers freely or not rotating on endless screws. 9. The device according to claims 1 to 8, characterized in that grooves are provided on the external surface of belts. 10. The device according to claim 9, characterized in that the grooves are parallel to the drive shaft's axis 11. The device according to claim 9, characterized in that the grooves are helical. 12. The device according to claim 9, characterized in that the belts have two systems of crossing helical grooves. 13. The device according to one of claims 1 to 12, characterized in that comprises motors (14, 15) with variable speed of rotation which drive the respective drive shafts (7, 8). 14. The device according to claim 13, characterized in that the motors (14, 15) are two-way motors.