US2121879A - Tobacco cutting device - Google Patents

Description

June 28, 1938. v LQRENTZ ToBAQco CUTTING DEVICE Filed on. 11, 19:54

' ference and edges.

' grinding means to sharpen the knives at their superficies.

Patented June 28, 1938 i 2,121,s79I- i 'roBAoco CUTTING DEVICE,

Application October 11, 1934, Serial No. 747,878

7 In Germany October 27, 1933 2 Claims.

This invention relates to a tobacco cutting device with rotating knives.

Cutting devices are known already, in which a number of rotary circular knives are combined to form a 'cutter'block or cylinder disposed on suitable carriers, the knives'of two adjacent cylinders engaging each other for cutting. The tobacco entering between the knives is out up into strips, which involves considerable wear on the part of the knives, particularly at their circum- In the known machines the cutter blocks had therefore'to be exchanged from time to time and reground outside the machine.

The invention eliminates this defect by causing the knives to cooperate during operation with In each tobacco cutting machine grinding devices are preferably disposed which can be arranged at will relative to the knives in such a way that the latter retain during grinding their motion required for cutting, but simultaneously cooperate with the grinding means.

The supply of tobacco is preferably interrupted during grinding to prevent contamination of the tobacco by the grinding dust.

According to the invention, the knives or knife carriers and the grinding means are adjustable relative to one another was to make allowance V for the wear of the knives during cutting or 1 30 V Afurther advantage afforded by the invention is that the grinding means cooperating with the cutter blocks may be disposed within range 01' a piping passing'through the casing to remove emery or metal dust. .For' this purpose the grind- .ing means is surrounded by a suitable covering,

such as a hood or the like, which extends up to the grinding point and at its other end is con nected with a preferably flexible air discharge piping.

One form of the invention is illustrated in the,

accompanying drawing, in which Fig. 1 is a section of a cutting device on the lines Il, of Fig. 2; and Fig. 2, a horizontal section of the device with part of the covering left standing.

Referring to the drawing, the frame I carries the base 2 of the casing receiving the cutting members.

detachable covers 3. Inside the casing on the base 2 pedestal bearings 4 are provided for receiving the cutter shafts on which a plurality of circular knives 6 are disposed one behind the other with suitable interposed shims, and fixed thereto so as to produce a continuous knife carrier. The members 4 are slidably arranged transversely tothe knife axis on the guides I to permit adjustment of the knife cylinders and vary the engagement of the individual cylinders. The cutter cylinders are driven from a pulley 8 acting upon one shaft 5 and, by suitable intermediate gears, upon the adjacent knife shaft.

To the side of the members 4 on the guides 1 pedestal bearings ID are arranged which carry the shafts H for the grinding discs l2. ,Below the shafts ll reversing spindles l3 are provided on which the fork l4 surrounding the grinding means I2 is guided. The drive of the spindles II is effected from the cutter shaft 5 by means of suitable intermediategears l5, l6 which may be interconnected also.

The bearing member M of the grinding discs l2 carries on an arm l1 an adjustable dressing member l8 for the grinding discs. The bearing member l4 further carries a protective hood I9 which surrounds the dressing member I 8 and is connected at the end with a flexible piping 20.

In the construction shown in Figs. 1 and 2 only the left-hand pedestal bearings are provided with such a hood, the hoods of the other bearings having been omitted for the sake of clearness. The

piping 20 leads to a ventilator, not shown, which draws off the air from the grinding point and thus removes the emery and metal dust produced by grinding.

The grinding discs are adjusted relative to the knives by suitable spindles 2| disposed below the knives or grinding means and operated from without. 7

To the casing 2, 3 conduits 22 and 23 are connected' for conveying the tobacco to the rotary knives and away from them, the piping 22 serving as supplying and the piping 23 as discharging conduit, or vice versa, according to the adjustment of the machine. The leaves are thus carried by the conveying air current to the cutting point and then carried away again. The invention can be applied also to devices without pneumatic feeding of the tobacco to be cut. 7

The grinding means are normally adjusted so as to be able tocontact with the knives 6, and in this position the cutting takes place. If the knives are to be ground, the supply of tobacco The base 2 is covered on top by the for the circular knives, means cooperating with the grinding means for drawing ofi grinding dust and a drive for causing to and fro motion of the grinding means along the knives.

2. A device according to claim 1 wherein the means for drawing off grinding dust are formed of a Ventilator, a hood surrounding the grinding means and a suction piping connecting the hood with the ventilator.

VALENTIN LORENTZ.

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