The top roller installed at the both sides of the tin bath can effectively control the width and thickness of the gross glass ribbon. The main technical index: 1. The thickness of glass sheet:1.0-25mm 2. The horizontal oscillative angle of head: ¡À19¡æ 3. The accuracy of head's oscillative angle: ¡À0.1¡æ 4. The speed of rotating coil of head: 10-1500m/h 5. The accuracy of coil-speed of head: ¡À0.01% 6. The radial direction run-out should be no more than 0.2mm 7. The accuracy of head's pressed-depth: ¡À0.1mm 8. The biggest depth for head (inside the bath): 2000mm 9. The longest distance of machine frame for lifting up and down: 100mm 10. The accuracy of machine frame for lifting up and down: ¡À0.1mm 11. All the above index can be customer-designed.