Longitudinal cutting device
A longitudinal cutting device with a cutting mechanism, which is arranged between an infeed and a delivery and has rotary cutters movable transverse to the transport direction, comprises transport devices that are arranged on the knife receptacles of these rotary cutters and bridge the region of the cutting mechanism with a conveying effect.
1. A device for longitudinally cutting webs or sheets of material, such as cardboard or pasteboard, said device comprising
a machine frame ( 200 ) with at least one pair of oppositely arranged sidewalls ( 201 ),
an infeed ( 11 ) comprising cooperating upper and lower transport rollers arranged above and below a transport plane ( 5 ), wherein said infeed is arranged in the machine frame ( 200 ) and feeds the webs or sheets to a cutting mechanism of the device in an essentially linear transport direction ( 6 ) within the transport plane ( 5 ),
a driveshaft ( 211 ) fixed in the frame, wherein said driveshaft is aligned essentially parallel to the transport plane ( 5 ) and transverse to the transport direction ( 6 ) and spans a transport region of the webs or sheets, said transport region extending transverse to the transport direction ( 6 ),
a linear guide ( 203 ) that is spaced apart from the at least one drive shaft ( 211 ) and essentially arranged parallel to the at least one driveshaft ( 211 ) and spans the transport region, and
the cutting mechanism is arranged in the machine frame ( 200 ) and comprises at least one rotary cutter ( 220 ) including at least two circular knives ( 223 , 225 ), wherein each of the at least two circular knives ( 223 , 225 ) of the rotary cutter ( 220 ) is respectively arranged in a knife holder ( 221 , 222 ) and at least one of the knife holders ( 221 , 222 ) is arranged so as to be movable along the at least one linear guide ( 203 ) transverse to the transport direction,
wherein said device includes at least one transport ( 240 ) that is arranged in the cutting mechanism and comprises at least one transport element ( 241 , 246 ), which is arranged on a carrier ( 237 ) with at least one circular knife ( 223 ) so as to be movable transverse to the transport direction ( 6 ) to any position along the at least one linear guide ( 203 ), wherein said at least one transport element takes hold of the webs or sheets with a conveying effect at least in a region between the rotational axes of the circular knives ( 223 , 225 ) of the at least one rotary cutter ( 220 ) and transports the webs or sheets through the cutting mechanism in the transport direction ( 6 ).
2. The device of claim 1 , wherein the region where the at least one transport element ( 241 , 246 ) takes hold of the webs or sheets extends at least over an area of the transport plane ( 5 ) penetrated by the knives ( 223 , 225 ).
3. The device of claim 1 , wherein the at least one transport element ( 241 , 246 ) of the transport device ( 240 ) is formed by an endless revolving transport element ( 241 , 246 ), which forms a support for the webs or sheets at least in the region of the circular knife ( 223 ).
4. The device of claim 1 , wherein the at least one transport element ( 241 , 246 ) is associated with one of the at least two circular knives ( 223 , 225 ) and movable along the at least one linear guide ( 203 ) together with this circular knife.
5. The device of claim 4 , wherein the at least one transport element ( 241 , 246 ) is arranged on the knife holder ( 222 ) of the respectively associated circular knife ( 223 ).
6. The device of claim 4 wherein the carrier ( 237 ) of the at least one transport element ( 241 , 246 ) is connected to a carrier ( 237 ) of the knife holder ( 222 ) of the rotary cutter.
7. The device of claim 1 , comprising a drive connection of the at least one transport element ( 241 , 246 ) to the drive shaft ( 211 ).
8. The device of claim 7 , wherein said drive connection comprises a common drive connection of the at least one transport element ( 241 , 246 ) and the respectively associated circular knife ( 223 ) to the at least one drive shaft ( 211 ).
9. The device of claim 1 , wherein the carrier ( 249 ) of the at least one transport element ( 241 , 246 ) comprises a housing ( 250 ), which has at least one opening toward the transport plane ( 5 ), and a suction line ( 252 ) leading into the housing ( 250 ), wherein a suction mechanism ( 253 ) applies suction to the suction line ( 252 ) to gather and remove dust accumulating during the cutting process.
10. The device of claim 1 , wherein the at least one transport element comprises transport elements ( 241 , 246 ) transversely spaced from each other with the same associated circular knife ( 223 ) positioned between the transport elements ( 241 , 246 ).
11. The device of claim 1 , wherein the at least one transport element ( 241 , 246 ) of the transport ( 240 ) comprises a transport belt ( 241 ) wrapped around a first deflection roller ( 243 ) and a second deflection roller ( 245 ) wherein the first and second deflection rollers ( 243 , 245 ) are respectively arranged upstream and downstream of the circular knives ( 223 , 225 ) in the transport direction ( 6 ).