USHA 8801 Industrial Sewing Machine - VS SewingMachine
The Usha 8801E (Single Needle Lockstitch Medium Duty Direct Drive
Machine) is a hot favourite among users of high speed industrial
machines. The 550 watts motor powers the machine enabling it to stitch
at speeds as high as 5500 spm (stitches per minute) while also making it
durable. While its Up/down needle position feature facilitates corner
stitching, pocket attaching, as well as collar stitching, the soft start
speed feature avoids thread breakage while starting the stitching
The developed measurement system is based on a Singer 882 overedge machine configured to produce the three-thread stitch type 504. Several sensors measuring the relevant process parameters have been applied to the machine. The sensors’ signals are conditioned by custom-developed hardware and are then connected to a data acquisition board plugged to the PC. A software package developed in LabView acquires, stores, displays and analyses the signals . The test rig measures sewing process variables related to three different sub-functions of the machine: Needle penetration, fabric feeding and thread interlacing or stitch formation. The pick-up of needle penetration forces is achieved by a commercial piezoelectric sensor
To assess the fabric feeding behavior, a piezoelectric sensor was applied to the presser-foot bar. This sensor measures the dynamic forces on the presser-foot bar and the spring. Additionally, an LVDT has been incorporated to indicate vertical displacement of the presser-foot
Stitch formation is described by the thread pulling forces and thread consumptions. Fig. 3 shows the set-up of the sensors. Thread forces are sensed by semiconductor strain gages applied to the base of a metallic beam. To measure thread consumption, digital encoders have been equipped with wheels where the sewing threads are wound. The pulses produced by the passing thread are then counted during seam formation
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