Abstract 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 lightweight papers. It also, in such cases, can remove some tension from the tractor pins.
A machine for detaching sheets from continuous crossperforated webs, comprising a constant tension constant speed infeed mechanism which comprises pinfeed tractor device for the web, a pair of high speed pull rolls for seizing the successive new ends of thE web and bursting sheets therefrom, means for driving said pull rolls continually at a speed greater than that of the infeed mechanism, and a free-running snubber roll bearing upon the web beyond the tractor device, whereby the resistance of the web to the pulling force of the pull rolls is solely effected by the retarding effect of the constantly applied tension of the normal feed of the infeed mechanism, said snubber roll bearing the brunt of the restraining force on the web.
Claim 2
Dependent Claim
122 words
A machine for detaching sheets from continuous crossperforated webs, comprising a constant tension constant speed infeed mechanism which comprises pinfeed tractor device for the web, a pair of high speed pull rolls for seizing the successive new ends of thE web and bursting sheets therefrom, means for driving said pull rolls continually at a speed greater than that of the infeed mechanism, and a free-running snubber roll bearing upon the web beyond the tractor device, whereby the resistance of the web to the pulling force of the pull rolls is solely effected by the retarding effect of the constantly applied tension of the normal feed of the infeed mechanism, said snubber roll bearing the brunt of the restraining force on the web.
Claim 3
Dependent Claim
39 words
The machine as set forth in claim 1 in which a breaker blade is interposed between the infeed mechanism and the pull rolls, and means are provided for swinging said breaker blade to an inoperative position for certain operations.
Claim 4
Dependent Claim
86 words
The mchine as set forth in claim 1 in which is provided an adjustable breaker device comprising a swingable bracket carrying at one location thereon a free running bearer roll for exerting a constant contact bearing pressure due to its own weight upon the web thereby contributing to the retarding force to facilitate the bursting of a card web, for example, and carrying at another location thereon said free-running snubber roll and a cooperating breaker blade, as for use in the separation of lighter paper webs.
Claim 5
Dependent Claim
20 words
The machine as set forth in claim 1 in which a support means is disposed beneath said free-running snubber roll.