摘要:
A control system for a blank presser used to touch down blanks fed from a conveyor controls the blank presser so as to hold down each of the blanks at the proper time, so as to thereby prevent them from scattering or jamming up. The control system can control the blank presser automatically even if the speed or length of the blanks changes.
摘要:
A paperboard web is severed transversely between the double facer machine and the slitter-scorer after the completion of a production order. The speed of the double facer machine is maintained constant while the severed web section is accelerated to a speed substantially above the speed of the double facer machine to create a gap. Adjustments to one or more of the slitter-scorer and cut-off for the next production order are made while the same are in the gap. Sheets cut from the web section are shingled on a shingling conveyor. The speed of the shingling conveyor is accelerated prior to the arrival of the last sheet of the web section and decelerated while the gap is on the shingling conveyor.
摘要:
A sheeter for feeding sheets in shingled relation to a point of collection including a source of sheets, a first conveyor belt and a second conveyor belt operating at substantially reduced speed so that the sheets are collected thereon in shingled relation. For snubbing the successive sheets so that they are decelerated and uniformly spaced on the second conveyor belt, a snubber is provided in the form of a knock-down roller arm rotating in a vertical plane at the upstream end of the second conveyor belt and so spaced therefrom as to press a sheet into engagement with the second conveyor belt, the arm being driven at a rotary speed which is synchronized with the source, with means being provided for adjusting the phase of the arm with respect to the source so that the arm engages the tail of each successive sheet. In the preferred form of the invention the conveyor belts are separated to form a gap occupied by a diverter, and a high speed nip is provided at the downstream end of the gap so that a sheet traverses the gap and is fed into the nip without changing its speed. For squaring up each sheet passing through the high-speed nip, a pair of squaring and press down rollers are provided at the downstream end of the second conveyor belt with means for adjusting the longitudinal position of the rollers so that they are engaged by the leading edge of the sheet just prior to engagement of the tail of the sheet by the knock-down arm thus insuring precise shingling and freedom from buckling of individual sheets. Infinetely variable cutoff is provided.
摘要:
Collision between the tail and head ends of successive singly fed sheets to be overlapped is avoided by ejecting air along a frame sloped downwardly away from the line of feed of the sheets. The tail end of a preceding sheet is thus drawn down out of the path of the head end of a succeeding sheet which is to overlap the preceding sheet.
摘要:
This apparatus for receiving sheets cut from a web comprises only mechanical means for retarding and braking the successive cut sheets so that they overlap one another before being delivered. This apparatus comprises downstream of the rotary cutter at least one upper cylinder and a lower cylinder, said upper cylinder having on one portion of its outer peryphery at least one peripheral boss having a cylindrical contour, engageable in at least one recess of same radius formed in the lower cylinder.
摘要:
Apparatus for successively cutting a plurality of similar sheets from the leading end of a web which is being fed forwardly, the apparatus including means for pulling the sheets forwardly from the cutting station, means for forming the travelling sheets into a shingled stream of sheets with the leading end of each sheet overlying the trailing end of the previously fed sheet, means for turning the thus shingled sheets over while they continue their travel, and means for forwarding the turned over shingled sheets to a stacker which is fed from the bottom of the stack. The apparatus of the invention is so constructed that it can be readily adapted to the handling of sheets of different lengths.