US1138192A - Driving-gear for rotary pulp-screens. - Google Patents

Description

R. S. CLARKE.

DRIVING GEAR FOR ROTARY PULP SCREENS.

APPLICATION FILED JULY6, 1914.

1,1 38, 1 92. Patented May 4, 1915.

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RALPH S. CLARKE, OF WALPOLE, MASSACHUSETTS, ASSIGNOR TO WANDEL SCREEN MANUFACTURING COMPANY, A. CORPORATION OF MASSACHUSETTS.

DRIVING-GEAR FOR ROTARY PULP-SCREENS.

Application filed July 6, 1914. Serial No. 849,159.

To all whom it may concern Be it known that I, RALPH S. CLARKE, a citizen of the United States, residing at lValpole, in the county of Norfolk and State of Massachusetts, have invented certain new and useful Improvements in Driving-Gear for Rotary Pulp-Screens, of which the following is a specification, reference being had to the accompanying drawings, forming part thereof.

This invention relates to improvements in mechanism for effecting the intermittent rotation of the pulp gathering cylinders or screens of pulp screening machines to progressively carry the pulp gathered thereby to positions to be acted upon by the water sprays.

One object of this invention is to simplify the construction of driving gear for rotary pulp screens having vibratory movement in order to reduce the number of gears and their shafts and bearings with their attaching devices.

Another object of the invention is to so construct a pulp screen having duplex rotary pulp gathering screens and means for effecting vibratory action of said screens that the reaction of the screens is resisted in a manner to effect the intermittent rotation thereof.

Other objects of the invention will appear from the following description.

The invention consists in such novel features of construction and combination of parts as shall hereinafter be more fully described and pointed out in the claims.

Figure 1, represents an end elevation of a pulp gathering machine or screen of the nature herein referred to and illustrating the new invention, portions of the same being broken away. Fig. 2, represents a plan view of portions of the same.

Similar characters of reference designate corresponding parts throughout.

Pulp gathering machines of the nature herein referred to usually comprise a vibratory pulp gathering member, ordinarily a cylindrical screen, and mechanism for moving said member during its vibration Whereby the pulp gathered by such member is moved to a point at which it is subjected to a shower of water which tends to carry the finer particles of pulp through interstices of the screen or pulp gathering member, such screening operation being assisted by the Specification of Letters Patent.

Patented May 4, 1915.

vibratory movement of the pulp gathering member. In machines of this character in which rotary screens have been employed it has been customary to rotatably mount the screens in knocker arms, so called, pivotally mounted on the frame of the machine and having their ends free, for a limited movement, and provision has been made by means of rotatable knocker ratchets or cams having steps to vibrate said free ends of said knocker arms. The rotation of said screens has been effected through trains of gears mounted on shafts which latter are journaled in bearings many of which are secured to the machine frame or parts of the machine by bolts. Under the continued strokes of the knocker cams against the striker blocks of the knocker arms the vibration of the parts is transmitted throughout the entire machine, the securing means for the various bearings and other parts of the machine become loosened while the shafts, their bearings, and the pitch points of the several gears become unduly worn.

As shown in the drawings but one end portion of the machine is illustrated, it being understood that the other end of the machine is of approximately similar construction. Parts of the machine heretofore well known and which do not necessarily form part of this invention are also omitted.

In carrying this invention into practice, I provide 'a pair of end frames as 5 between which is located the usual pulp pan or basin 6, indicated. The end frames as 5 have the studs 7, 7 on which are pivoted the arms 8, 8 having the laterally extending bearings 9, 9, to receive journaled members of the pulp screens, and the depending member 10, 10

provided withthe slidably adjustable blocks 11, 11 having the contracted followers 12, 12 having curved ends. In suitable bearings is journaled the shaft 13 which may be rotatably driven in any usual or well known manner and is provided with the cams as 14 having the projections on spurs 15, 15 and the recesses or stops 16, 16 the outline of which is a succession of regular curves, outward and inward whereby the end of the followers 12, 12 may follow said outline and may be at all times sustained thereby against the stress of the arms 8, 8.

The cylindrical screens 17, 17 are of any usual constructionand having the cylindrical end members 18, 18 which are rotatably sustained by the bearings 9, 9 of the arms 8, 8. On each of these cylindrical members 18, 18 is clam ed the split collar 19 having the peripheral y grooved member 20 and the perforated lugs 21, 21 which are drawn by the bolts 22, 22 to clamp the collar 19 to Mounted on the cylindrical member 18. frames as 5 are the brackets 23, 23 having pivot pins 24, 24 carrying the eccentrics 25, 25, which are rotatably adjustable on said pins and, on the peripheries of said eccentries 25, 25 are mounted the bearing rings 26, 26 of the arms 27, 27 which arms have at their outer ends the wedges 28, 28 shaped to frictionally engage the side walls of the peripheral groove in member 20 of collar 19. Springs 29, 29 are attached to said arms 27 27 and to the studs 30, 3.0 fixed on the frames as 5 and said springs act constantly to draw the arms 27, 27 in directions to engage their wedges 28, 28 with the grooves of members 20, 20 the points of coiiperation between said wedges and said grooves being determined by the adjustment of the eccentrics 25, 25 whereby the extension of said arms 27, 27

' from the axes of the pins 24, 24 may be varied.

By reference to Fig. 1 of the drawing it will be seen that when shaft 13 and its cams as 14 are rotated the followers 12, 12 of the blocks 11, 11 will rideoutward on the projections 15, 15 of said cams as 14 whereby the free ends of arms 8, 8 will be caused to swing outward, thus swinging upward the I bearings 9, 9 of said arms 8, 8, and'moving the grooved members 20, 20 in releasing directions relative to the wedges 28, 28 until the highest points of said cam projections 15, 15 pass said followers12, 12 after which said followers will follow inward on the pe ripheries of said cams until they reach the lowest points'of the recesses 16, 16. At the time the arms 8, 8 and their bearings 9, 9 begin their reactive movement the tendency of the cylindrical screens 17 17 is to follow the movement of said bearings 9, 9 but such movementof the screens 17, 17 is prevented by the engagement of the wedges 2.8, 28 with Copies of this patent maybe obtained 'for the grooved members 20, 20 of collars 19, 19 and such engagementof the wedges 28,28 is sufficient to sustain said collars 19, 19 and 7 their screens at peripheral points while the overbalanced weight of the screenlaterally parts may depend somewhat upon the size of the cam 14 or upon the speed at which it is desired to rotate said cam, one purpose of this cam being to utilize the recesses or parts 16, 16 of the cams as 14 as stops to limit the inward movement of the followers 12, 12 toward the axis of the cams as 14 without undue jar to the machinery where by the use of the cushioned buffers ordinarily employed is avoided.

Having thus described my invention I claim as new and desire to secure by Letters Patent I I The combination with a pulp screen having a bearing, means for effecting vibratory motion of said bearing, a pulp screen having a cylindrical extension journaled in said bearing, a split collar clamped on said member and having a peripheral groove, a pin fixed on the machine frame, an eccentric sleeve rotatablefor adjustment on said pin, an arm having a bearing sleeve embracing said eccentric and, at its free end a wedge adapted to'engage the groove of said collar, and a spring acting to draw said wedge arm toward said collar.

RALPH S. CLARKE. Witnesses:

WALTER M. LAINE, MILLARD, M. Emits.

five cents each, by addressing the Qommissioner of Patents,

Washington, D G.

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