US2745343A

US2745343A - Automatic vibrator roll

Info

Publication number: US2745343A
Application number: US343313A
Authority: US
Inventors: Davis Noel
Original assignee: Harris Seybold Co
Current assignee: Harris Corp
Priority date: 1953-03-19
Filing date: 1953-03-19
Publication date: 1956-05-15
Anticipated expiration: 1973-05-15

Description

May 15, 1956 N. DAVIS AUTOMATIC VIBRATOR ROLL 2 Sheets-Sheet 1 INVENTOR. N052. DAV/5 4% j WWW 2N ys an R R A rra Filed March 19, 1953 MK vb May 15, 1956 N. DAVIS AUTOMATIC VIBRATOR ROLL 2 Sheets-Sheet 2 Filed March 19, 1953 INVENTOR. NOEL 0/9V/5 BY; 2 I

United States Patent AUTOMATIC VIBRATOR ROLL Noel Davis, Gates Mills, Ohio, assignor to Harris-Seybold Company, Cleveland, Ohio, a corporation of Delaware Application March 19, 1953, Serial No. 343,313

10 Claims. (Cl. 101348) This invention relates to improvements in automatic vibrator rolls for use in the inking mechanisms of printing presses. A vibrator roll is one which is caused to bear upon other ink rollers and in addition to rotation has endwise movement back and forth for distributing and smoothing out the ink to be applied to the form cylinder of the press. The means for inducing reciprocating movement of the roll in the present instance is a two-way screw fixed in the frame of the machine, with the threads of which a driving dog carried by the roll cooperates.

One of the objects of the invention is the provision of a vibrating roll which will function smoothly and with certainty over a long period of use, and the parts of which will not be subject to breakage or undue wear.

Another object of the invention is the provision of a novel mounting for the driving dog which has a pivotal movement for reversing the direction of travel.

A further object is the provision of an oscillator mounted interiorly upon the roll and surrounding the screw, which oscillator may consist of an annulus that carries the driving dog and a pair of diametrically opposed trunnions for insuring accuracy in the pivotal mounting of the driving dog upon the roll.

Another object is the provision of a dog having a crescent contour of such form as to have maximum bearing on the screw threads While avoiding any interference with the threads at the instant of reversal.

Other objects and features of novelty will appear as I proceed with the description of those embodiments of the invention which, for the purposes of the present application, I have illustrated in the accompanying drawings, in which:

Fig. l is an elevational view partly in longitudinal section of a vibrator roll embodying the invention.

Fig. 2 is a transverse sectional view taken substantially on the line 22 of Fig. 1 illustrating my improved means for mounting the traveller which carries the driving dog.

Fig. 3 is a transverse sectional View taken substantially on the line 33 of Fig. 1.

Fig. 4 is a detail elevational view illustrating the annulus which carries the crescent shaped dog and the trunnions by means of which the annulus is pivoted.

Fig. 5 is a detail sectional View taken substantially on the line 5-5 of Fig. 4.

Fig. ,6 is a cross-sectional view similar to Fig. 2, but showing a modification.

Fig. 7 is an elevational view of the driving dog of Fig. 6.

Fig. 8 is a sectional view of the dog taken substantially on the line 88 of Fig. 7.

Fig. 9 is a plan view of the driving dog of Figs. 7 and 8.

Fig. 10 is a cross-sectional view illustrating a further modification.

Fig. 11 is an elevational view of the driving dog of Fig. 10.

Fig. 12 is a sectional view of the dog of Fig. 11 taken substantially on the line 12-12 of Fig. 11, and I Fig. 13 is a plan view of the driving dog of Fig. 11.

Referring first to Figs. 1 to 5 of the drawing, 10 is 2,745,343 Patented May 15, 1956 a shaft which is fixed in the side frame members, not shown, of the inking mechanism of a printing press. Upon this shaft there is a fixed sleeve 11 in which are cut the reverse threads of a two-way screw. At one end of the screw and surrounding sleeve 11 there is a reversing collar 12. Beyond the latter the sleeve is threaded and a nut 13 is screwed onto the sleeve in tight engagement with the collar 12, after which a tapered hole is drilled through the joint between the collar and nut, through the sleeve 11 and into the shaft 19 to take a tapered pin 14 by means of which these parts are held in fixed relation. At the opposite end of the screw there is a reversing block or half-collar 15, corresponding in function to collar 12, which bears against an annular abutment 16 that is integral with sleeve 11 and is secured to the shaft by a pin 9 or other suitable means. One or more pins 17 extend through abutment 16 into half-collar 15 for holding the latter in the desired angular position.

Surrounding the shaft and the screw mounted thereon there is a roll the active part of which is a cylindrical shell 18 of metal or other hard material adapted to bear upon other rollers of an inking mechanism and to be rotated by friction from such other roller or rollers. One end of the shell is closed by a plug 19 which carries a bushing 20 that is slidable and rotatable upon shaft 19. intermediate the ends of the roll there is a reinforcement 21 with a bore of sufiicient size to clear the threads of the screw and the parts 15 and i6.

Abutting against the reinforcement 21 there is a housing which at its leftend comprises a relatively wide head 22. Preferably head 22 is provided with a dowel 22 which enters a recess in reinforcement 21 for preventing relative rotation between these two parts. From this head 22 there extend two longitudinal bars 23, see Fig. 3, which tie head 22 to head 24, the latter carrying a bushing 25 that is slidable and rotatable upon the shaft. At its right hand end shell 18 is internally threaded to take an externally threaded nut 26. By means of this nut the housing is held up against the reinforcement 21 and is locked to shell 18. The upper portion of the head 22 of the housing, as viewed in Figs. 1 and 2, is cut out to receive a cap 27 which in the assembled condition is secured to the head 22 by means of screws 28. In the head 22 and cap 27 there are diametrically opposed

bores

29 and 36 which receive bushings 31 and 32.. In these bushings there are oscillatably mounted aligned

trunnions

33 and 34 which project outwardly from an oscillator which in this instance comprises an annulus 35.

The inner surface of annulus 35 is beveled outwardly in both directions from its median plane 36, as indicated at 37 and 38, Fig. 5. A dog 44) of crescent shape is formed integral with the annulus. At its central point opposite the trunnion 34 the crescent has its maximum cross-sectional dimension which fits slidably but rather closely into the groove of one of the threads of the screw. From this point the cross-sectional dimensions of the crescent decrease toward its ends. The width where the crescent joins the

surfaces

37 and 38 of the annulus, referred to as the outer-surface of the crescent, decreases as the crescent proceeds towards its ends, while its width along its inner surface which just clears the root of tr e screw thread decreases at a greater rate to compensate for the combination of face and helix angles on the surface of the screw threads. The inner surface of the crescent has a slight ridge 41 in the plane 36, the inner surface of the crescent being beveled away from this ridge at the same angles as the surfaces 37 and of the annulus. The sides 42 of the crescent are concave, and the contours are such that a maximum bearing of the crescent in the threads is attained consistent with sure and accurate reversing movement of the dog at the ends of the stroke. The head '22, the annulus 35 or other oscillator,v the crescent 40 and the trunnions. 33.and 34 are hereinafter referred to as a traveller. V

Themechanism is so designed that assembly of the parts is simple and easy. The screw sleeve 11 with collar 15 is 33 extended into bushing 31 after which cap 27 is put in place with bushing 32 receiving trunnion 34 and the screws 28 are threaded home. Next the housing assembly, including the

oscillator

33, 34, 35, is slid over the shaft from right to left, the collar 12 and the nut 13 being not yet in place, and the crescentis caused to enter the then open end of the screw. Now the collar 12 and nut 13 with locking pin 14 are put in position. The screw and housing being thus assembled, they are inserted into the shell from the right end thereof as viewed in the drawing, the shaft being caused to extend through bushing 20. The bushing 25 is then mounted on the right hand end of the V shaft and'the nut 26 is threaded home, whereby the housing is gripped tightly between the annular reinforcement 21 and the nut 26 and thus secured to shell 18.

Suitable lubricating means is provided. 45 is a grease connection at the end of the passage 46 leading into the interior of the housing for the lubrication of the screw. An annular groove 47 in the outer face of head 24 conducts grease over to a second passage 48 leading to the interior of the housing. A grease connection 49 in communication with an annular passage 50 is adapted to supply grease to two metal tubes 51 and 52 which project into head 22 and are connected by passages 53 and 54 with holes through bushings 32 and 31 respectively by means of which the trunnion bearings are lubricated. A separate grease connection 55 is provided for lubricating the internal surface of bushing 20.

It will be obvious from the foregoing that as the shell 18 is rotated, due to frictional contact with another rotating roller, the crescent shaped dog 40 will travel from the position of Fig. 1 to the right through the proper thread of the screw, thereby sliding the shell and the parts attached thereto to the right until the crescent engages the reversing collar 12, whereupon the annulus 35 will be turned on its

trunnions

33, 34 through a small angle to direct the crescent shaped dog into the reverse thread, which will cause the shell and other parts of the roll to travel to the left until the crescent encounters the deflecting half-collar 15 when another shift of the crescent is made and a second cycle begins.

The

bevels

37 and 38 are desirable in order that clear- I ances may be small and yet so that interference will not with reference to the first described form. In this case,

the traveller consists of the

head

62, 63 and an oscillator 65, The

head elements

62, 63 have registering cylindrical cavities or wells which constitute bearing means for the oscillator'65, which has a cylindrical outer surface. This oscillator along one of its'median planes is provided with 4 or beveling being for the same purpose as the

bevels

37 and 38 of the first described-form of the invention.

In Figs. 10 to 13 inclusive'there is shown a second modification in which the head 72 and the cap 73, fastened together by screws 74, are hollowed out to provide registering semi-oval cavities forming bearing means for an egg-shaped oscillator 75, the long axis of which is perpendicular to the shaft 10. Here the'parts 72, 73 and 75 constitute the traveller. Symmetrical with a, plane at right angles to the shaft, indicated by the line7 6 of Fig.-l2, is a crescent 77 identical in form and contour with the, cres cents previously .described. The oscillator has an opening therethrough defined by conical surfaces 78 and 79 meet- 7 ing at the plane 76 and having the same function as the double

conical opening

68, 69 of Fig. 8.

It will be apparent that the operation of the two modifications illustrated in Figs. 6 to 13 inclusive is thesame as that of the first described form of the invention illustrated in Figs. 1 to 5 inclusive' In all cases the oscillator turns upon an axis at right angles to the shaft axis, with hearings on opposite sides of the shaft. This construction provides a stable pivotal mounting which overcomes the difficulties encountered in previous constructions that may one end thereof, means for fixing said housing in said roll,

be said to be of cantilever nature, these djificulties comprising excessive wear of the parts, producing loose joints which result in inaccurate action, especially at the moment of reversal, andeventually in the points of the crescent a traveller carried by said housing and cooperatingwith said screw, said traveller surrounding the screwjand comprising an oscillator surrounding the screw with an opening therethrough of greater diameter than the external diameter of said screw, a crescent carried by and fixed with respect to said oscillator and projecting into said opening, said crescent running in said screw and constituting a driving dog, bearing means for said oscillator car- 7 ried by said traveller on opposite sides of said screw, said an integral crescent 66 having the same form and contours in each direction from the aforesaid plane to provide conical surfaces 68 and 69' as shown in Fig. 8, the flaring bearing means being in alignment upon an axis at'right angles to said screw and cutting said crescent at its midpoint, and deflecting means at the ends of said screw, for engagement with said crescent to turn said oscillator on its said bearing means and'cause said crescent to enter the reverse thread. v

2. In mechanism of the character stated, a shaft member with a two-way screw thereon, an encircling member surrounding said screw, one of said members being held against rotation while the other is adapted to be rotated and one of saidmembers being adapted to slide relatively to the other, a traveller carried internally bysaid encircling member, said traveller surrounding the screwand.

comprising an oscillator surrounding the scew with an internal surface of greater diameter than the external diand cutting said crescent at its mid-point, and deflecting 7 means at the ends of said screw for engagement with said crescent to turn said oscillator on its said bearing means and cause said crescent to enter the reverse thread.

3. In an automatic vibrator roll, a fixed shaft, a twoway screw thereon, .a hollow roll enclosing said screw, -a traveller carried by said roll and cooperating with said screw, said traveller comprising an annular oscillator with an internal surface of revolution of greater diameter, than the external diameter of said screw, an internal crescent on said oscillator running in said screw and constituting a driving dog, bearing means for said-oscillatorcarried by said roll on opposite sides of said screw, the axis of said bearing means cutting said crescent at its mid-point, and deflecting means at the ends of said screw for engagement with said crescent to turn said oscillator on its said bearing means and cause said crescent to enter the reverse thread.

4. A vibrator roll construction as defined in claim 3, wherein the internal surface of said oscillator is relieved in both directions from its median plane.

5. A vibrator roll construction as defined in claim 3, wherein the width of said crescent where it merges with the internal surface of the oscillator is at a rnaxirnu: throughout its extent, the radial dimension of the crescent at its mid-plane remaining the same from end to end and the thickness dimension decreasing gradually in two Ways, first from its mid-point to its ends and second from its outer surface to its inner surface.

6. A vibrator roll construction as defined in claim 3, wherein the width of said crescent where it merges with the internal surface of the oscillator is at a maximum throughout its extent, the radial dimension of the crescent at its mid-plane being substantially the same as the depth of the threads of said screw and the width of the internal surface of the crescent decreasing from the mid-point to the ends thereof, the side surfaces of the crescent joining its internal surface and the surface of the annulus being concave.

7. In an automatic vibrator roll, a fixed shaft, a twoway screw thereon, a hollow roll enclosing said screw, a housing in said roll through which said screw extends, said housing comprising a separable cap, trunnion bearings in said housing and cap disposed diametrically opposite each other, an oscillator carried by said housing cooperating with said screw, said oscillator comprising an annulus with an internal surface of revolution of greater diameter than the external diameter of said screw, an internal crescent on said annulus running in said screw and constituting a driving dog, a pair of opposed outwardly extending trunnions on said annulus mounted in the hearings in said housing and cap, the axis of said trunnions cutting said crescent at its mid-point, and deflecting means at the ends of said screw for engaging said crescent to turn said annulus on its trunnions and cause said crescent to enter the reverse thread of the screw.

8. In an automatic vibrator roll, a fixed shaft, a twoway screw thereon, a cylindrical shell enclosing said screw and having end closures rotatably and slidably mounted on said shaft, a two-part head carried internally by said shell intermediate its ends, an oscillator mounted in bearing means carried by the two parts of said head on opposite sides of said screw, an internal crescent on said oscillator running in said screw and constituting a driving dog, the axis of said opposed bearing means cutting said crescent at its mid-point, and tubular connectors between one of said end closures and said intermediate head in communication with said opposed bearing means, whereby lubricant may be transmitted to said bearing means from one end of the roll.

9. In mechanism of the character stated, a shaft member with a two-way screw thereon, an encircling member surrounding said screw, one of said members being held against rotation while the other is adapted to be rotated and one of said members being adapted to slide relatively to the other, an oscillator carried internally by said en circling member, said oscillator comprising an annulus with an internal surface of slightly greater diameter than the external diameter of said screw, an internal crescent on said annulus running in said screw and constituting a driving dog, a pair of opposed outwardly extending trunnions on said annulus, hearings in said encircling member receiving said trunnions, the axis of said bearings and trunnions cutting said crescent at its mid-point, and deflecting means at the ends of said screw for engagement with said crescent to turn said annulus on its trunnions and cause said crescent to enter the reverse thread.

10. In an automatic vibrator roll, a fixed shaft, a twoway screw thereon, a hollow roll enclosing said screw, an oscillator carried by said roll and cooperating with said screw, said oscillator comprising an annulus with an internal surface of revolution of slightly greater diameter than the external diameter of said screw, an internal crescent on said annulus running in said screw and constituting a driving dog, a pair of opposed outwardly extending trunnions on said annulus, bearings in said roll receiving said trunnions, the axis of said bearings and trunnions cutting said crescent at its mid-point, and deflecting means at the ends of said screw for engagement with said crescent to turn said annulus on its trunnions and cause said crescent to enter the reverse thread.

References Cited in the file of this patent UNITED STATES PATENTS 717,138 Thomson Dec. 30, 1902. 809,521 McKinley Jan. 9, 1906 1,491,491 Ny Apr. 22, 1924 1,642,068 Hart Sept. 13, 1927