Patent GB-1372202-A (GB)
Title: Monitoring method and apparatus for the reeling and rewind operation  of a sheet-making process
IPC: G06F19/00
Filed: 1971-08-26
Abstract: 1372202 Monitoring web production INDUSTRIAL NUCLEONICS CORP 26 Aug 1971 [26 Aug 1970] 12716/74 Divided out of 1372201 Heading G4A In a machine for making a web of material and forming a reel therefrom and on which defective web portions may be formed, which defective portions are to be cut out leaving predetermined lengths of good material when the reels are rewound, a monitoring apparatus receives roll specification signals, production progress signals and material quality signals and automatically calculates sheet material lengths corresponding to predetermined reel radii after rereeling, compares the actual length with the calculated lengths and produces completion signals on equality and produces a material quality signal indicative of an overall characteristic of the material at each equality signal. A defective material signal is also provided and when it terminates, the unfinished lengths are recalculated so that the desired amount of good material can be obtained on rereeling. As described, the reel is to be rewound to form 3 "shipping rolls" of predetermined radius and the material is paper. The paper making apparatus comprises a sheet break detector 44, a detector 46a for out of gauge paper, a manually actuated status indicator 110, and a paper speed tachometer 48. The initially entered data is the reel inner radius, the number of shipping rolls to be wound from it, the paper thickness (caliper) and the core and roll diameter for each shipping roll. Programmer 118 moves switches 120 to the second position and length computer 122 calculates the length of paper for the first roll and feeds this to the first store of register 126. This value is also fed from the register via adders 128 and 129 to update yards register 126a and is fed to reel radius computer 132 which calculates and prints out (68) the corresponding radius. The process is repeated for the second and third lengths, the adders 140 and 128 adding the relevant lengths before the radii calculations and the resulting radii again being printed out. Yardage computer 98 calculates the length of paper passed from the readings of clock 100 and tachometer 48 and passes the value to total yards accumulator 92 and via gate 102 to good yards accumulator 96. If the paper breaks, detector 44 opens gate 90 and prevents change of the accumulator value. When the value in good yards accumulator 96 reaches the first yardage value in register 126, comparator 150 generates an output which after a delay at 154 steps stepper switch 152 and resets the good and bad yards accumulators. The second yardage value in register 126 is now the comparator reference. If during the winding of the second portion of paper a bad section occurs, product quality indicator will generate a signal which switches gate'102 so that the input changes from the good to the bad yards accumulator. Change direction indicator 112 is also actuated to insert a tab into the paper reel. At the end of the bad signal, a differently marked tab is inserted in the reel, gate 102 switches back to its original position and a signal is sent to programmer 118 on line 112b. The programmer operates switch 130 connecting the total yards accumulator 92 to the reel radius computer 132 which calculates and types out the present radius. Switch 124b is then made and switches 120 are stepped and the bad yards figure is used to recalculate the radii for sets 2 and 3. The value for set 1 is not affected since switch 152b is in its middle position and diode 162 gives protection. When the amount of good paper for set 2 is completed, comparator 150 output actuates stepper 152 and resets the accumulators as before after delay 154. During the delay, the undelayed output from comparator 150 enables gate 166 and adds the bad yards accumulator value to the value 2 in register 126 and after a delay 170 updates the yardage value 2. After all the desired paper has been wound on to the reel, the accumulators are all reset by reel turn up signal generator 50. Various gauges 46 scanning paper data such as basis weight and per cent moisture may feed results continuously to data storage 180. These results maybe processed at 182 or statistically treated at 184 and are printed out at each reset signal giving a material quality value for each shipping roll.