US1894569A - Roller mill - Google Patents

Description

J. MEZG ER ROLLER MILL Jan. 17, 1933.

Filed July 15, 1931 2 Sheets-Sheet 1 Jaye/2Z0]? j w/ W? J. MEZGER ROLLER MILL Jan. 17; 1933.

Filed July 15, 1951 2 Sheets-Sheet 2 Patented Jan. 17, 1933 UNITED. STATES PATENT OFFICE JACQUES MEZGER, OF ST. GALIi, SWITZERLAND, ASSIGNOR TO FIRM GEBR'l'j'D-ER B'UHLER,"

7 OF UZWIL, SWITZERLAND ROLLER MILL Application filed July 15, 1931, Serial No.

This inventionrelates to improvements in roller mills particularly for cereals. The great majority of the roller mills for cereals used are included in an automatic sequence of working incidences and therefore require to be provided with a device which permits automatic adaptation of the mill to the changing working conditions;

The most frequent changes arise in the feed of stock and are compensated in the known roller mills by an automatic feeding device, which adapts itself unattended to the variable feeding conditions. Devices of this kind are provided for example with automatically adjusting flaps or feed rollers running at variable speeds respectively, while the grinding rolls rotate at all times at the same speed. In this manner the output of ground goods is necessarily varied inasmuch as with the number of revolutions of the grinding rolls remaining constant, and consequently with the working surface per unit of time being constant the amount of round stock er unit of time produced changes and thus according to the quantity of stock admitted to the rolls on a grinding surface of a certain size, in equal time intervals, difierent quantities of ground goods are obtained. Under these conditions the grinding capacity of the mill can not possibly be uniform. Therefore it is desirable to combine a regulating device with the mill which would regulate the amount of ground goods obtained per unit of grinding surface in a given time. 7

This aim is reached according tothe invention in that in contradistinction to all existing mills the number of revolutions of the grinding rolls is varied in accordance with the feed of stock. I This result can be obtained that in the feed means for the mill a member is inserted which in accordance with the affluent stock actuates a regulating means for adjusting the number of revolutions of the grinding rolls.

In the accompanying drawings several modifications of the regulating device according to the invention are illustrated, by way of example only, in which Fig. l is a sectional side elevation of a 551,033, and in Germany July 23, 1930.

roller mill comprising a mechanically operated regulating means,

Fig. 2 1s a side elevation of a roller mill comprising four rollers,

Fig. 3 is a front elevation of the roller mill shown in Fig. 2, partly in section, and

Fig. 4; illustrates a detail on a larger scale. In the regulating device shown in Fig. 1 a control spring 1 is suspended by a rod 2 from a cross-bar 3 in the feed chute 4 of the roller to the machine through the chute 4, the portion of which surrounding the spring consists of a glass cylinder in order to make the movements of the spring visible from outside the machine andcorrespondingly shifts the linkage comprising the bell crank levers 9 and 10, the connecting rod 11, and the rod 12 on which the transmission roller 13 is mounted. The transmission roller 13 is inserted between a pair of, driving discs 14:, one, of which being secured to the shaft of the roll 6 and the other to the driving pulley 15 of the mill. According to the position to which the roller 18 is moved relatively to the centers of the discs 1% by the expansion or contraction of the spring 1, the speed of the grinding rolls 6, 7 is decreased or increased respectively. It is obvious that instead of the friction disc change speed device 13, 1 1 any other suitable device of this kind may be used.

In the Figs. 2 and 3 a roller mill 5 comprising four grinding rolls 16, 17, 18, 19 is illustrated wherein the control member is in the form of a resilient plate 20 pivoted at 21 which plate corresponding to the quantity of stock admitted through the respective half of the feed chute opens or closes the feed gap between the segment 22 and the roller 28 more or less, the segment 22 being positively connected to the plate 20 by mea-ns'of a knee lever 2%. The rotatable contact arm of a rheostat 25 is also connected to the abutment plate 20 by means. of lever arm 26 and link 27 for regulating the speed of the respective motor 28, through cable 29. The motors 28 are in driving association with the grindingrolls 16, 17 and 18, 19 respectively by suitable driving means, for example abelt drive 30 and a spur gear drive 31 so that the speed of the motor is increased when the feed of stock increases and conversely. Also with this construction the position of the plate 20 is recognizable from the outside of the mill, a pointer 32 being arranged on the pivot of the contact arm of the rheostat 25 indicating said position on the scale 33. By properly gauging the scale 33 it may enable reading off the specific output of the mill directly.

In place of the abutment plate a spring similar to that shown in Fig. 1 may be used as control member also with the arrangement illustrated in Figs. 2 and 3 (see Fig. 4) and vice versa.

Instead of mechanical or electrical auxiliary means operating as a servomotor for actuating the change speed device a hydraulic or pneumatic servomotor may be interposed between the control member and the change speed device.

The regulating device may be set to work in such manner that the specific amount of stock admitted to the working rolls is constant or varied in any suitable relation.

I claim:

1. In a roller mill particularly for cereals, in combination, cooperative grinding rolls, feed means for conveying the stock to said cooperative rolls, a prime mover operatively associated wtih said rolls, speed regulating means for said prime mover, a control means included in said feed means and influenced in dependency on the fiow of stock, and transmission means cooperating with said control means and said speed regulating means for said prime mover, adapting the latter to adjust the speed of the grinding rolls in accordance with the feed of stock for maintaining the specific output of ground goods from the surface of the rolls constant.

2. In a roller mill particularly for cereals, in combination, cooperative grinding rolls, feed means for conveying the stock to said cooperative rolls, a prime mover operatively associated with said rolls, a change speed gear operatively connected with said grinding rolls, a control means included in said feed means and influenced in dependency on the flow of stock, and a servomotor cooperating with said control means and said change speed gear and adapting the latter to continuously adjust the number of revolutions of the grind ing rolls in accordance with the feed.

3. In a roller mill particularly for cereals,

control means, and connecting means between said control link and said speed regulating means for said motor, adapting the latter to continuously adjust the number of revolutions of the grinding rolls in accordance with the feed.

In testimony whereof I have signed my name to this specification.

JACQUES MEZGER.

in combination, cooperative grinding rolls,

feed means for conveying the stock to said cooperative rolls, an electric motor operatively associated with said cooperative rolls, speed regulating means for said motor, a control means included in said feed means and influenced in dependency on the flow of stock, a

control link operatively connected with said

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