Study on V.D.Q Pulley
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The document discusses the v.d.q pulley, a critical machine component affecting fabric quality by controlling the grams per square meter (g.s.m.) of the fabric through tension adjustments. It outlines the relationships between machine gauge, machine diameter, and needle gauge, emphasizing their importance in determining yarn feeding and stitch length. Additionally, constants for different fabric types are provided to facilitate appropriate machine settings for desired outcomes.
Study on V.D.Q Pulley
- 1. EXPERIMENT 3:STUDY ON V.D.Q PULLEY. MACHINE PARAMETERS 1. V.D.Q Pulley. 2 Machine Gauge 3 Machine Diameters. 4. Needle Gauge. 1. V.D.Q Pulley VDQ pulley (Variable Dia for Quality Pulley): It is a very important part of the machine. It controls the quality of the product. Altering the position of the tension pulley changes the G.S.M. of the fabric. Fig.VDQ Pulley If pulley moves towards the positive directive then the G.S.M. is decrease. And in the reverse direction G.S.M will increase. Pulley Belt: It controls the rotation of the MPF wheel. Brush: Its clean the pulley belt. V.D.Q pulley is a pulley which drives several smaller pulleys by a tooted belt. These smaller pulleys are at the driven position and drive a clutch device which engages
- 2. V.D.Q pulley constant There is a relation of V.D.Q number, stitch length and needle number. It is, Constant, Kv = This constant is dependent mainly on the M/C. Different machine type, brand; diameter can vary the value of the constant. For a given machine the constant is same. For Single jersey fabric the V.D.Q pulley constant is 41.20825 & for Rib fabric the V.D.Q pulley constant is 68.76084. With these values a better selection of VDQ number can be obtained for a particular stitch length. VDQ pulley is control the GSM of stitch. The main function of VDQ pulley is increase and decrease of the GSM. If the single jersey GSM 120-130 it’s for needed 30/32 Ne yarn. 2. Machine Gauge No. of needles per inch present in a needle bed of a knitting machine is called machine gauge for that knitting machine. Selection of machine gauge depends upon the following: Yarn count, Fiber type, Yarn twist, Yarn finished. 3. Machine Diameter Machine diameter is mainly diameter of m/c cylinder. It is important for fabric width. Only diameter does not fetermi-with the yarn wheel. By varying the dia of the V.D.Q pulley, which is at the driver position, the amount of the yarn feeding can be controlled. This variation in the yarn feeding varies the stitch length and the G.S.M. V.D.Q a Stitch length (when needle is same) V.D.Q a No. of Needle (when stitch is same) From the above two expression we get, V.D.Q a Stitch length X Needle Constant, Kv= This constant Kv varies with the diameter of the machine, type of the machine (single or double jersey), different brand of machines. 4. Needle Gauge Thickness of needle express by the needle gauge. It is important for selection of machine gauge