US2610800A - Multiroll chocolate refiner and like machines - Google Patents

Description

Sept. 1 ,1952

I A. A. TUNLEY 3 610300 MULTIROLL CHOCOLATE 'REFINER AND LIKE MACHINE Filed May 26, 1950 I NVENTOR Y a m D m. M H N H L A n ATTORNEY Patented Sept. 16, 1952 MULTIROLL CHOCOLATE REFINER AND LIKE MACHINES Allan Ashmead'Tunley, Peterborough, England,

assignor to Baker Perkins Limited, Peter- ,borough, England Application May 26, 1950, Serial No. 164,419

In Great Britain May 30, 1949 3 Claims.

This invention relates to multi-roll chocolate refining machines, such as five-roll refiners, or similar machines in which a feed roll is provided for supplying the material to be treated to the lowest or first of the refining rolls.

In such machines there is a danger of some hard or resistant foreign body being accidentally fed, together with the supply of the material to be ground or treated, into the nip/between the feed roll and the first refiner roll. Should this occur damage to the machine is liable to arise if separation at the nip to allow the obstruction to pass does not take place.

In order to permit this separation, shear pins have been employed in mechanism which holds the feed roll up to its work, for example, a shear pin has been introduced in the hand wheel mechanism provided at each end of the feed roll for adjusting the nip thereof in relation to the first refiner roll. By this arrangement any obstruction liable to produce undue strain in its passage through the hip is intended to cause shear pin rupture to take place and-the feed nip to be relieved. I

This arrangement is not altogether satisfactory as the complete relief of the hip is dependent upon both pins being sheared, which is likely only to occur if the obstruction resides precisely in the middle of the length of the roll. The fracture of a single pin in the arrangement exemplified above is also unsatisfactory as it affords relief at one end only of the feed :roll, causing such to tilt, and this tilting may not be sufiicient to clear the obstruction and it may also damage the roll gears.

Accordingly the aim of the present invention is to overcome the objections of, the nature above indicated and provide improvements whereby the .feed roll will give way as a whole to an obstruetion entering the nip, in any position longitudinally of the roll, and further, whereby the resistance to displacement of the feed roll is a predetermined uniform factor.

The invention consists in supporting the feed roll in the adjustable nip position upon a relievable predetermined resistance means common to both ends of the roll (such as a single shear pin or member) to which the force, set up by an obstruction, acting either upon both or mainly upon one end bearing of the roll, is transmitted to cause its relief. I

The invention also comprises, in a multi-roll refiner or like machine having nip adjustment means for the feed roll at each end thereof, providing a displaceable abutment for each adjustment means and connecting said abutment to a common member dependent upon a single v In the accompanying-drawings which illustrate only those parts of a refiner necessary: I

Figure 1 is an end view partly in section of the feed roll and the abutment means.

Figure 2 is a view on the line 2-2 of Figure 1, the roll being removed. 7

Figure 3 is a view showing the'coupling of the abutment and the single shear pin.

Figure 4 is a partial plan of Figure 3.

In carrying the invention into effect according to one mode as described by way of example, the feed roll I for supplying materal to the first of the refiner rolls 2 is mounted in bearings which are carried in lever members 3 pivoted in the frame 4 of the machine such that the displacement of said levers 3 by hand wheel gear may be utilised for adjusting the dimensions of the nip between the feed roll I and the first refiner roll 2. The lever mounting 3 and hand wheel gear is ofknown kind and as each is the same for both ends of the roll, it will be sufiicient to describe one only. Thepivot 5 of the lever 3 is located below the roll I and the outer end of the lever has a stirrup 6 in which is mounted the hand wheel adjustment means for causing the displacement of the roll I about the pivot 5 towards or away from the first refiner roll 2. This hand wheel adjustment means comprises a hand wheel spindle 1 on which a worm is formed and this worm engages a worm wheel.

The worm'wheel isinternally screw threaded and acts as a" bushing for a correspondingly screw-threaded thrust rod 8 which, in the case of the known arrangement,'operates against a fixed abutment table or face upon rotation of the hand wheel to effect adjustment of the feed roll. According to the present improvement, however, instead of this thrust rod 8 bearing upon a fixed abutment its end is supported upon a displaceable abutment constituted by one arm 9 of the bell crank lever pivoted on a short shaft In which lies substantially parallel with the hand wheel worm axis.

Referring now to both bell crank leversQthe arms thereof H which do not contact with the thrust rods are connected to a bar or member [2 common to both levers. This common bar ex-' In the region of this shear pin orifice lithe"- side frame I6 is provided with a seating for a ring or cage H in which the removable shear .pin I3:

is located in such a position that it may traverse the said orifice I4 on the common bar or its extension. The shear pin location may be iexternally covered by a suitable cap I8 secured in anyconvenient manner to the side frames of the machine. In one convenient-form the common bar member I 2 may comprise 'a pair of parallel rods I211, I211 of elongated rectangular cross-section bolted together in spaced relation and having at the end towards the shear pin location acon necting rod or extension I 5 pivoted at 22'between the ends of said rods I211, I212.

In operation, when either hand wheel spindle 1 is turned, the associated worm-bushing is rotated and causes the thrust 'rod- 8 to react against the abutment arm 9 of 'thebell crank levers 9, I I anchored through the common bar 'I2' on-the shear pin I3, and displace the corresponding end of the feed roll I towards the first refiner roll 2. By manipulation of both hand wheel spindles! the parallelism of the -nip-may be adjusted'to'the desired clearance. 'I'hroughthe connection of the bell crank levers 9, I I tothe'commonmember or rod I2'the positionof the abutment arms 91s maintained entirely by the'single shear pin I3; and should the shear pin fracture then both the abutments 9 will drop and consequentlythe feed roll nip will be relieved 'atboth ends equally.

Thus when an obstruction enters the nip tending to cause the nip clearance-to increase, the-pressure caused thereby will be transmitted to one or both of said'abutments 9 and from thence to the shear pin I3 causing its fracture, with theresult that the feed roll willretract from the refiner roll 2 and relieve the nip so that the obstruction canpass. roll I is dependent for its position upon the shear pin I3 it will be appreciated that wherever .an

obstruction enters a nip anywhere along 'the' length thereofcne or other'ofthe ends of the feed roll I will be displaced and the shear pin I3 will be ruptured, thereby'removing the operative support from both ends ofthe feed roll.

At the end'of the bar I 2 remote from the shear pin location or at any other suitable position an adjustable cam may be mounted adapted to engage the roll 23 on the arm'24 of a limit switch;

The switch is in- El mounted ontheframe 4. cludedin the circuit of the driving motor for the refiner rolls so that in the event of the pin 13 being broken the motor will cut out.

I claim:

1. In a multi-roll refining machine the combination' comprising: a' frame; a refinerroll and means rotatably supporting said roll in fixedrelaticnship to said frame; a feed-'rollybearings rotatably supporting each end of said feed. roll; means mounting thereof onto the frame about-a mount- As each end of the feed,

supporting said bearings for pivotal,

ing axis spaced from and parallel to the axis of said roll; an abutment pivotally ailixed to said frame, means including a frangible member holding said abutment against pivotal movement with respect to said frame; means carri d by the housing of one of said bearings and bearing againstsaidabutment for moving said feed roll about said mounting axis and adjusting its spacing thereof with respect to said refining roll.

2.. In a multi-roll refining machine the com bination comprising: a frame; a refiner roll and means rotatably supporting said roll in fixed relationshipto saidframe; a feed roll; bearings rotatably supporting-each end of said feed roll; means supporting said bearings for pivotal mountingthereof onto the frame about a mounting-axis spaced from and parallel to the axis of saidroll; an abutment adjacent each end of said roll and each of said abutments being pivotally 20 mounted onto said frame; means connectingsaid abutments to effect-simultaneous movement of each-thereof; means including a frangiblemember. .holding' said connecting means for the prevention of movement of said abutments; means 25 supported upon" the housing of each of said bearings and b'earingagainst said abutments for moving-'said-feed roll about said mounting axis towardsaid refining 'roll; whereby upon fracture of said frangible member, said abutments will fall simultaneouslyand said last named means mu be .rendered ineffective;

'3. In a multi-roll refining; machine, the combination comprising: a frame; a-refiner roll and means rotatably supporting said 'roll' in fixed relationship to said-frame; a feed roll; bearings r0- tatably supporting eachend'of said feed roll; means supporting said bearings for pivotal mounting thereof onto theframe about an axis spaced from and parallel to the axis of said roll; an abutment adjacent each end of said roll and eachof said abutments being pivotally mounted onto said frame; a rod-connecting said-abutments to effect simultaneous movement of each thereof; means including a shear pin extending between said rod and said frame-for preventing movement of said abutments; means supported upon each bearing housing-and bearing against said abutmentsfor moving said feed roll about said mounting axis toward said refining roll;

whereby upon fracture of said shear pin, said abutments will fall simultaneously and said last named means will be rendered ineffective;

ALLAN ASHMEAD 'I'UNLEY.

'3 REFERENCES CITED The following references are ofirecord' in the file of this patent:

UNITED STATES PATENTS Number Name Date 158,257 Dobler Dec. 29', 1874 266,152 Holt Oct. 17, 1882 315,583 Wild Apr. 14, 1885 323,432 Erenberg July 2, 1885 1,535,392 Ashton Apr. 28,1925 1,645,672 Van Suan Oct. 13, 1927 1,901,159 Guest Mar. 14, 1933' 2,114,660 Thalman -1 Apr.- 19, 1938 2,182,900 McIlvreid et al Dec. 12, 1939 2,205,370 Brice June 18, 1940 2,273,772 Pollitz Feb. 17,- 1942

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