| 摘要 |
The detacher disclosed comprises a web infeed including the usual guides and tension brushes and pin-feed tractors. The usual high-speed pull roll sets are employed to effect the severance of the successive forms and the forwarding of them to the delivery conveyor or other depository. However, no low speed gripper or jump rolls are employed, the arrangement being such that sufficient retardation of the web for the bursting of the forms is furnished by the tractor and infeed members. This eliminates the necessity for providing timing means for starting the form web in a specified position, cams, change gear assemblies, vernier's, etc. A simple motor-driven belt guided by idler pulleys is employed for all of the driven parts. The actual burster instrumentality comprises a novel quick switch-over blade and pressure roller unit for alternative use with paper webs and tab cards. An abrasive covered roll may be employed between the infeed assembly and the point of severance to give some slight snubbing action on the web, especially in the case of light-weight papers. It also, in such cases, can remove some tension from the tractor pins.
|
