US1769355A - Drive for paper-making machines - Google Patents

Description

July 1, 1930. B. A. MALKIN DRIVE FOR PAPER MAKING MACHINES Filed Aug; 8, 1928 3 Sheets-Sheet l INVENTOR BERNARDAMALKIN J 1m; ATTORN??? I Jlily 1930- B. A. MALK!N I 1,769,355

DRIVE FOR PAPER MAKING MACHINES Filed Aug. 8, 1928 5 Sheets-Sheet 2 INVENT 0R BERNARDAMALKIN ATTOR'NE Y8 II ll ll llllllill ll Illlllllllllll II II II II I! Illll II II July 1, 1930. B. A. MALK!N DRIVE FOR PAPER MAKING MACHINES Filed. Aug. 8, 1928 3 Sheets-Sheet 5 INVENTOR BERNARDAMALKIN Y [m 3 A'ITORNFZ Patented July 1, 1930 BERNARD A. MALKIN, or LACI-IINE, QUEBEC, CANADA DRIVE FOR PAPER-MAKING MACHINES Application filed August 8, 1928. Serial No. 298,344.

This invention relates to new and useful improvements in drives for paper making machines and particularly to the drives for the drier sections.

invention is to provide a drier section which will be more accessible than has been heretofore attained in any of the drives at present in use.

Another object. is to provide a drier section drive by whichthe felt tension will be controlledand the speed of the motors is synchronized to conform to the natural shrinkage thereof, resulting in a stronger sheet of paper and less breakage.

According tomy invention I provide a drier section consisting of a plurality of rolls divided into small groups each group being driven by a separate motor, or other means. The only synchronizing means is the drier 29 felt, so that the felt tension is controlled and the drier speed conforms to the natural shrinkage of the felt during the drying process and as this shrinkage conforms to the natural shrinkage of the paper',- a stronger sheet results and fewer breakages are encountered than in driers where the speed of the rolls throughout the'machine is uniform.

In the drawings which illustrate my invention:-- I v c Figure 1 is a part side elevation of a drier section of a paper making machine showing my preferred form of improved driving mechanism. f

Figure 2 is a part sectional end elevation taken on the line 2'2 Figure 1. I

v Figure 3 is a part sectional end elevation taken on the line 33 Figure 1.

Figure 4 is a part plan of a drier section of a paper making machine showing one of the modifications which may be made to the driving mechanism shownin Figures 1 to 3, inclusive. I

Figure v5 is a part side elevation of one "of the motors shown in Figure 4 and showing its driving connection to the drier rolls.

Figure 6 is a part plan view on an enlarged scale of the mechanism shown in Figure 5. 50 Figure 7 is a plan view of a drier section be made to the The main object of the showing a further modification which may mechanism shown in Figure 1. p I

F igure' 8 is apart side elevation of the. machanism shown in Figure 7. I Figure 9 is an enlarged view of one of the driving units in proximity to the motors. Referring more particularly to the drawings: 11 designates the upper drier rolls which are spaced from one another and arranged ina horizontalrow. The rolls are mounted on spindles 12 rotatably held in bearings 18 formed in the frame 14. The lower rolls '15 are arranged in spaced relation and in a horizontal row. Said lower rolls are preferably so arranged that they 'lie below and midway between the upper rolls. Spindles 16 frotatably mounted in H bearings 17 formed in the frame 14, support the lower rolls. Guide rolls 18 are placed between each of the upper rolls and similar guide rolls 19 areplaced between the lower-rolls. The upper drier felt 20 passes over the top of the upper-rolls 11 and under the guide rolls-18 while the lower felt passes under the lowerrolls 15 and over the top of the guide rolls 19. The paper sheet designated 22 passes alternately over the top rolls and under the'bottomrolls and between said rolls and the felts. The 1 foregoing is descriptive of one type of drying'machine now commonly in use and to which my improved driving mechanism hereinafter described is applicable. The'jupper' and lower roll spindles extend beyond the frame. Secured to the upper and lower roll extensions are the toothed wheels 23 and 24. The rolls are driven in batches or groups and for illustrative purposes only I have shown three upper and three lower 1 rolls in each group. Between each pair of toothed wheels 24, attached to the lower roll spindles are the idler toothed wheels 26.

-The idler wheels 26 are mounted on spindles is no idler wheel connection between each' batch of rolls so that each batch can be run at a different speed from the batches adjacent thereto, to take up the stretch on the paper felt as it passes through the machine;

The above details are common to all figures in the drawings. In the drive shown in Figure 1, each group is driven by an independent motor having a toothed pinion which meshes with one of the toothed wheels in the group preferably secured to the lower roll spindles. It will be seen that each group is independently driven and that the only connection between the groups is through the drier felts.

In Figures 4, 5 and 6, the adjacent end roll driving wheels of each group are driven by pinions 30 and 31, secured to the shafts 32 and 33 respectively, each shaft bein rotatably mounted in a gear case 3 1. Secured to and rotating with the shaft 32 is the toothed wheel 35 which meshes with a toothed pinion 36 adapted to rotate with a bevel wheel 37 rotatably mounted on the motor extension spindle 38, mounted in suitable bearings 39, formed in the gear case 3a. A toothed wheel 40 is secured to the shaft 33 and meshes with the toothed pinion ll adapted to rotate with the bevel wheel4l2 rotatably mounted on the spindle 38. Keyed to the spindle 38 and between V the bevel wheels 37 and 4:2 is the sleeve 43. Rotatably mounted on pins 44 extending outwardly from the sleeve are the bevel toothed wheels 45, each of which meshes with the bevelled toothed wheels 37 and 42. The motor extension spindle is coupled with the motor 46 by means of the coupling 47. This arrangement allows two batches of six rolls, each batch comprising three upper and three lower rolls to be driven by a common motor in such a manner that the connection between the batches is only through the felts. The gearing connection between the batches is of the differential type so that the felts can be kept at the proper tension between each batch.

In Figures 7 to 9 inclusive a further modification is shown in which one motor is used to drive four batches of six rolls comprising three upper and three lower rolls. To accomplish this, bevel toothed wheels 48 are secured to the spindles 38 ins ead of coupling them to the motor 46. The wheels 48 mesh with the bevel toothed wheels 49 secured to the shaft 50 and 50 rotatably mounted in bearings 51 and 52, the latter being formed in a casing 53, an enlarged view of which is shown in Figure 9. Secured to aflange 54, formed in the casing v53, is the toothed wheel 55 which meshes with a toothed pinion 56 secured to the spindle 57 of a motor 58. Within the casing and secured to the shafts 50 and 50 are the bevel wheels 59, each of which meshes with bevel wheels 60 and 61 rotatably mounted on pins 62 projecting inwardly from the inner surface of the casing. The shafts 50 and 50 are adapted to be driven independently of one another and their adjacent ends 63 are positioned centrally of the casing.

Holding the pins 62 in place and also the bevels 60 and 61, a collar 64. is provided in the shafts 50 and 50*. In the driving mechanism shown in Figures 7 to 9, three sets of differential gears are employed and one motor to drive twenty-four rolls in batches of six.

It will be readily seen that other modifications may be made to the driving mechanism without departing from the spirit of the invention.

It will be seen in operationthat each group or batch is independently driven and the only synchronizing means between the groups is the drier felts which are held in tension inthe manner well-known in the art but not shown in the accompanying drawing. The felt being kept in tension, it will be seen that the drier speed inthe groups will automatically adjust itself by regulating the motor speeds in the drive shown in Figure 1, or through the differential gears as shown in Figures 4 to 9 inclusive, to, suit the natural shrinkage or expansion of the felts'during the drying of a sheet of paper. As the naturalshrinkage of the felt corresponds as nearly as possible to the natural shrinkage of the paper, fewer breakages occur and a stronger sheet of paper is obtained than when using a; machine with even speeds. throughout. It will also be seen that by arranging the wheels in the manner herein described, easier access to the interior of the machine for inspection and repairs, is obtained than in any of the devices at present in use in paper drying sections.

Having thus described my invention, what I claim is I 1. In a paper making machine, a drier section, comprising a horizontal row of upper rolls, a horizontal row of lower rolls, said rolls being arranged in groups, toothed gear wheels driving each lower roll, toothed gear wheels for driving each upper roll, idler toothed wheels meshing with the driving wheels of the bottom row, of each group, idler toothed wheels between the idler wheels on the bottom row and the driving wheels of the top rolls, differential driving units connected directly with each o-fsaid groups,

means for operating the said driving units and endless drier felts adapted to pass through the machine and regulate the speed of each group to suit the expansion or contraction of the paper during the drying process. 7

2. In a paper making machine, a drier section including spaced groups of rolls, each 'group comprising spaced horizontally disposed upper and lower rolls,'a motor,

differential gearing units connecting the motor with adjacent groups, whereby the latter can be rotated at relatively different 5 speeds, and continuous drier felts between the rolls and forming a balancing medium for the speed of said groups.

3. In 'a paper making machine, a drier section including spaced groups of rolls, each group comprising spaced horizontally disposed upper and lower rolls suit-ably geared together, a gear casing, shafts journaled in-said casing, pinions carried by said shafts for rotating the adjacent rolls of the respective groups, a motor, differential gearing arranged in said casing and connnecting the, motor to the aforementioned shafts, whereby said groups can be rotated at relatively different speeds, and continuous drier felts between the rolls and forming a balancing medium for the speed of said groups.

4. In a paper making machine, a drier section including a plurality of spaced groups of rolls, each group comprising hor- 25 izontally disposed upper and lower rolls,

differential gearing units operatively connecting the adjacent groups, whereby the latter canbe rotated at relatively different speeds, independently rotatable operating 30 shafts for said units, a motor common to said shafts, a differential gearing connnecting the motor with said shafts, and continuous drier felts between the rolls.

In witness whereof, I have hereunto set my hand. BERNARD A. MALKIN.

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