Rotary cutting head, particularly for tobacco cutting machines

Details Rotary cutting head, particularly for tobacco cutting machines Rotary cutting head, particularly for tobacco cutting machines

1988-08-15

1991-01-15

Watts, Douglas D.

Cutting

Cutting motion of tool has component in direction of moving...

Orbital motion of cutting blade

83628, 83642, 83674, 83700, A24B 712, B26D 186

Patent

active

049844911

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a rotary cutting head, particularly for tobacco cutting machines.
It is known that, in order to make high quality cigarettes, it is necessary for the tobacco to be cut cleanly into strips of uniform width in an optimum manner, with a minimum percentage of tobacco powder.


SUMMARY OF THE INVENTION

The object of the present invention is to provide a rotary cutting head which is particularly suitable for tobacco cutting machines and enables a block of tobacco leaving a supply device to be cut in an optimum manner, so that the tobacco is effectively cut and not broken into bits, and has very uniform dimensions and a minimum percentage of powder.
This object is acheved according to the invention by means of a cutting head comprising a rotatable shaft supported by a fixed structure at an angle to the direction of advance of a block of tobacco, at least one movable element rotatable by the shaft and carrying at least one cutter blade which is movable axially relative to the shaft for cutting the block of tobacco.


BRIEF DESCRIPTION OF THE DRAWINGS

Further characteristics and advantages of the cutting head according to the invention will become apparent from the detailed description which follows with reference to the appended drawings, provided purely by way of non-limiting example, in which:
FIG. 1 is a partially-sectioned, cut-away front view of part of a tobacco cutting machine incorporating a cutting head according to the present invention,
FIG. 2 is a simplified side elevational view of the machine shown in FIG. 1, with the associated device for supplying a block of tobacco by extrusion,
FIG. 3 is a simplified view of the machine shown in FIG. 1 from above.
FIG. 4 is a front view of a cam included in the machine of FIG. 1,
FIG. 5 is a simplified, partically-sectioned front view similar to the view of FIG. 1,
FIG. 6 is a front view of a tappet-holder disc forming part of the machine according to the invention,
FIGS. 7 and 8 are two cross-sectional views, on an enlarged scale, of a movable blade-holder device forming part of the cutting head according to the invention, in first and second conditions of use respectively,
FIG. 9 shows a detail on the arrow IX FIG. 8, and
FIG. 10 is a sectional view taken on the line X--X of FIG. 9


DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 shows a tobacco cutting machine comprising a fixed support structure including two vertical pillars A and B located side by side. A cutting head according to the present invention, generally indicated H, is rotatably mounted between the pillars. The head includes a shaft 1 rotatably supported at its ends by the pillars A and B by means of rolling bearings 2, and held axially by a double thrust bearing 3. One end of the shaft 1 passes through the pillar B and a pulley 4 is keyed onto it.
A hub 7 disposed around the shaft 1 is clamped axially by means of a sealed keying device 6 of known type and is rendered rigid with the shaft by means of keys 8. A hub 10 is mounted on the shaft between the end of the hub 7 facing the pillar B and the pillar, and has a circumferential disc appendage 11. The hub 10 is slidable axially along the shaft 1 but is rendered torsionally rigid with the latter by means of keys 9.
The end of the shaft 1 which passes through the pillar B is hollow so as to allow the pneumatic supply of a plurality of pusher cylinders 12 arranged parallel to the shaft 1 and each having its respective body fixed to a radial appendage of the hub 7. A rotary pneumatic distributor of known type is mounted on the hollow end of the shaft 1.
In the embodiment shown by way of example in the drawings, the cutting head has six cutting blades 20 each carried by a respective movable element 15. For simplicity, FIG. 2 illustrates only one movable element 15, although all the other blades are indicated.
Each movable element includes a shaped blade-holder body 15 which, as seen particularly from FIGS. 2, 7 and 8, is provided on one side with a pair of parallel guides 14 having respect

REFERENCES:
patent: 2835299 (1958-05-01), Pollmann
patent: 3769867 (1973-11-01), Schilling
patent: 4364402 (1982-12-01), Komossa et al.
patent: 4537104 (1985-08-01), Dealto et al.

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