Device for supplying webs of wrapping material to a cigarette making machine of the two rod type

Abstract

A device for supplying webs of wrapping material to a cigarette making machine of the two rod type is constituted by a device for cutting a web of wrapping material into a first and a second web of identical width, and by deviation devices associated with each of the webs for the displacement thereof in a direction crosswise to that in which the webs move forward. Connected to the first and second web are detector devices provided for operating, through circuit elements, a motor for each of the three deviation devices in such a way as to cancel, moment by moment, any possible differences in width between the first web and the second web and any deflection thereof with respect to a given sliding position.

What is claimed is: 
     
       1. A device for supplying webs of wrapping material to a cigarette making machine of the two rod type, comprising: a cutter means for separating longitudinally a web of wrapping material, defined as the main web, into a first web and a second web;   means for guiding the main web to the cutter means;   means for guiding the first and the second web to a utilization area;   a first deviation device associated with said main web for . .detecting the.!. .Iadd.effecting a .Iaddend.displacement thereof in a direction crosswise to that in which said main web moves forward;   two additional deviation devices, one of which is associated with said first web and the other of which is associated with said second web, for . .detecting the.!. .Iadd.effecting a .Iaddend.respective displacement thereof in a direction crosswise to the directions in which the first and second webs move forward;   motor means for driving the first deviation device and the two additional deviation devices; and   detector means for checking and correcting the width and the position of the first web and the second web;   said detector means being associated with said first web and said second web for checking, upstream of the utilization area, the width of at least one of the first web and the second web and the position of their edges;   said detector means including circuit means interlocked thereto for operating, in response to output signals of the detector means, the motor means with respect to each of said deviation devices until corrections of the widths and the positions of the first web and the second web are effected.   
     
     
       2. The device according to claim 1, wherein the detector means associated with said first web is placed, with respect to . .this.!. .Iadd.said .Iaddend.first web, in such a way as to emit signals indicative of the position of both edges of said first web, in order to operate, through part of the circuit means, the motor means of the deviation devices associated with said main web and said first web, respectively, and wherein the detector means associated with said second web is placed, with respect to . .this.!. .Iadd.said .Iaddend.second web, in such a way as to emit signals indicative of the position of one of the edges thereof, in order to operate, through part of the circuit means, the motor means of the deviation device connected to the second web.   
     
     
       3. The device according to claim 1, wherein the circuit means interlocked to the detector means associated with said first web comprise: a circuit block for emitting a first signal indicative of the width of the first web and a second signal indicative of the crosswise position of the first web;   a circuit block for making a comparison between said first signal and a signal indicative of the correct width of the first web, and also for emitting a signal for operating motor means of . .the.!. .Iadd.said first .Iaddend.deviation device . .connected to the main web.!.; and   a circuit block for making a comparison between said second signal and a signal indicative of the correct crosswise position of the first web, and also for emitting a signal for operating the motor means of the deviation device associated with the first web; and   wherein the circuit means interlocked to the detector . .device.!. .Iadd.means .Iaddend.associated with said second web comprise:   a circuit block for emitting a signal indicative of the crosswise position of the second web; and   a circuit block for making a comparison between . .this.!. .Iadd.the .Iaddend.signal indicative of the crosswise position of the second web, and also for emitting a signal for operating the motor means of the deviation device associated with the second web.   
     
     
       4. The device according to claim 2, wherein said detector means comprise photosensitive means constituted by image scanning sensors belonging to CCD array circuits. 
     
     
       5. The device according to claim 2, wherein said detector means comprise photosensitive means constituted by two sets of phototransistors. 
     
     
       6. The device according to claim 5, wherein said two sets of phototransistors are adjustable crosswise with respect to the . .direction.!. .Iadd.directions .Iaddend.in which said webs move forward. 
     
     
       7. The device according to claim 6, wherein said two sets of phototransistors are arranged in a rectilinear fashion so that each of the two sets is adjustable in a plane parallel to . .the.!. .Iadd.a .Iaddend.plane in which lies the corresponding web, in the region of the detector means.