2-ply corrugated paperboard production line-single facer
The machine stand of a single facer corrugated cardboard machine is generally designated with 10. Supported on levers one of them being shown at 11 is an upper fluted roller 12. A lower fluted roller 14 is rotatably supported on a bracket 13 and cooperates in a manner known per se with the upper fluted roller 12.Cooperating with the lower fluted roller 14 also is a applicator device 15 to apply glue. The portion of the lever 11 extending beyond the pivot point of the upper fluted roller 12 is connected to a hydraulic cylinder 16.Thereby, the fluted roller 12 may be forced against the fluted roller 14.
With the aid of lever arms one of them being shown at 17, a pressure roller 18 is pivotally supported in the machine stand. The lever 17 is pivotally supported in the machine stand 10, as shown at 19. The pivot point of the lever 11 for the upper roller 12 is designated 20. The portion of the lever 17 extending beyond the pivot point of the pressure roller 18 is articulated to a hydraulic cylinder 21 which at the other end is articulated to the machine stand 10. On the side of the lever 17 which faces away from the lower fluted roller 14 there is provided an abutment surface 22. Said abutment surface cooperates with an abutment 23 supported on the machine stand 10. The adjusting cylinder 21 serves to hold the lever 17 against the abutment 23.
corrugated paperboard production machine-single facer
In the absence of any opposing forces, the lever 17 lies in contact against the abutment 23 by its own weight and that of the pressure roller 18, respectively. With certain vibrations only a certain lifting of the lever 17 from the abutment 23 might occur. This is prevented by the adjustment cylinder 21. As will be recognized from FIG. 2, the abutment 23 is formed by two wedges 24, 25 which are supported at an abutment surface 26 of the machine stand 10. On the opposite side they are formed with an oblique surface cooperating with oblique abutment surfaces 27, 28 of the lever 17.
Th abutment surfaces 27 , 28 on the lever converge towards the center. By moving the wedges 24, 25 towards each other the lever thus is adjusted in a direction towards the lower fluted roller 14. In the opposite direction the lever 17 is adjusted in a sense away from the fluted roller 14. The wedges 24, 25 are seated on left and right hand thread portions of a shaft of adjustment 29 which may be driven from a motor 30 via a transmission 31. Fitted at the transmission shaft 32 is furthermore a measured value indicator 33. It is possible with the aid of an automatic control to adjust the respective position of the wedges 24, 25. The measured value indicator 33 represents the respective position of the shaft 29 and thus that of the wedges 24, 25. The position thereof determines the width of the nip. Thismay be digitally indicated, for example, by deduction from the measured value indicator signal.
It should still be noted that the force of the lever 17 when lying in close contact against the abutment 23 is still increased by the pulling force of the paper. In the case of known machines the pulling force of the papermay under certain circumstances be so strong as to bring about a transitory adjustment of the lever arms away from the abutments resulting in a transitory in crease of the roll nip.