AUTOMATIC SCUTCHER in Blowroom | How it works

Construction of the automatic scutcher is clearly shown in the figure. Condenser with fan suck the material from opening line and feed to reserve trunk of the pneuma feeder. An adjustable photo electric cell in the reserve trunk monitor the height of fibre and signals stop or start commands to the preceding machine.

Delivery roller guide the material to a coarse spiked opening rol1er without compressing it too much. This opening roller beat and open the cotton and then flings the tufts into an air current generated by a fan. The air current transports the tufts into the feeding trunk. There they are compressed uniformly across the full width by the pressure of air current.

Feeding trunk width can be adjusted according to the fibre bulkiness. An adjustable, sensitive pressure switch located with in the feeding trunk monitor the height of fibre and switches off or on the material transport from delivery roller.


Much narrower limits of density of stock are obtained in the feeding trunk than unstable condensation of a conventional hopper feeder. So, scutcher receives a very regular feed in its absolute weight in width and length. No nep formation due to absence of spiked lattice.

Uniform feed to the scutcher due to effective control by P.E. Cell in the reserve trunk and pressure switch in the feeding trunk.

Two delivery rollers in the scutcher take over the material from the feed trunk. They pass it on to the feed roller which in turn passes it to the sensing levers and the kirschner beater.

An integration of the sensing lever movements control the position of the cone regulator. The movements of the cone belt from its basic position actuate a differential drive. It regulate the speed of the feed roller in a definite ratio to the constant speed of v-belt drive for the transfer of drive to the feed roller.

Press button switches are provided for the regulations of the lap weight per yard through servo motor on the P.I.V. drive. The current position of the PIV drive and degree of regulations are clearly indicated on a scale. It is possible to determine the setting very quickly in case of blend or count changes overs. In case of fully automated scutcher, only the basic lap wt/yard is set by using corresponding press button switch. All later adjustments are carried out by the lap weigher.

The fine opening & ultimate cleaning is achieved by the mild combing action of kirschner beater on cotton tufts.

The grid under the kirschner beater can be adjusted by manual setting of a hand lever provided with an index plate, and completely closed while processing synthetic fibres. The first four of ten grid bars are separately adjustable.

A compact, one layer lap collects on the dust cage with a large surface area. In this manner with a dia of 55 cm cotton lap of 40 kg and synthetic fibre lap of 24 kg can be prepared which unroll with out any peeling on carding.

A strong fan exhausts the cage diametrically across its whole width. This ensures a uniform distribution of the material across the cage and also a careful extraction of the dust.

The sheet of cotton delivered from the cage deliver roller runs almost horizontally through the calender, as shown in the fig. By this arrangement a wider surface pressure is achieved, enabling higher compression of the sheet of cotton (LAP) without endangering the fibres. And also eliminate cracking of lap surface and false draft which occur when lap would have to run around the calender roller in a vertical position in the conventional scutcher.

The calender rollers are loaded pneumatically. This ensures always even pressure on both sides. The applied pressure can be read on a monometer and steplessly regulated to 6000 KP by a pressure reduction valve.

The machine stops on the entry of thick places of foreign bodies between calender roller. This eliminates break downs.

Rack heads are pneumatically loaded. The applied pressure can be steplessly regulated upto 100 KP and can be read on a manometer.

Latest automatic lap doffing:The required length of lap is pre-set by means of counter with decimeter setting. The impulse for lap change is given by limit switch, as soon as the lap attains a definite diameter. Immediately upon reaching the required lap length, the counter jumps back to preset length.

A 0.75 kw, 105 RPM reduction gear motor accelerate the lap roll in order to cut the lap. Simultaneously the pressure cylinder for the loading of the rack heads is counter ventilated. The rack heads rise and deliver the completed lap into the lap. tray. The lap spindle from the stand-by postion is placed on the forth coming lap. The beginning of the lap is tightly wrapped around the lap spindle. Rack heads are reloaded. The preparation of new lap begins.

By ventilating the pressure cylinder, the lap tray together with finished lap is moved sidewards. The lap together with the lap rod is completely stripped off the lap spindle. The lap Spindle rolls to the stand-by position where it waits ready for next lap doff.

LAP rod inserter: During the sideward movement of lap tray, the lowest lap rod from the rod magazine, that accomodate 20 lap rods, is released and inserted into the lap spindle of the lap under preparation during the return movement of the lap tray.

Lap weighter: The lap rolls into the tray of a lap weigher or a lap reserve tray the lap weigher register the lap weight deviation from the nominal weight on the register tape of the recorder and gives the impulse to the lap colour coder.

Lap colour coder: Every lap receives a washable colour spray marking on its side. This marking may be given a definite meaning eg blend, the number of the scutcher etc., laps out of tolerance receive an additional marking with another colour.

Simultaneously it indicate the deviation on a dial. Should the deviation from the nominal weight be large than the predetermined tolerance, the lap weigher gives an impulse to the servo motor and PIV gear that readjust the lap unit length weight to within acceptable tolerances.

Lap store: Depending on its size, the lap store automatically takes over 6 or more weighed laps. It is also possible to couple 2 or more lap stores in tandem. The lap store can also be connected to automatic lap conveyor system.