US3566515A - Roll grinding machine - Google Patents

Abstract

D R A W I N G
A GRINDING MACHINE PROVIDED WITH A DETACHABLE ASSEMBLY FOR SUBSTITUTING A GROOVING CUTTER FOR A GRINDING WHEEL AND DRIVING THE CUTTER FROM THE GRINDING WHEEL SPINDLE. DRIVE MEANS ARE ALSO PROVIDED FOR SYNCHRONIZING MOVEMENT OF THE GRINDING WHEEL CARRIAGE WITH ROTATION OF THE ROLL TO BE GROOVED.

Description

March 1971 G; v. HULTGREN E 3,556,515

ROLL GRINDING MACHINE Filed March 8, 1968 4 Sheets-Sheet l INVENTORS GunncxY V. HUN \qwm l5.

qvcn ZlKm as Donodd 3' cosxeMo Dufio M2 Wk ATTOR EYS March 2, 1971 GQv. HULTGIRQIIEN EYT AL I ROLL GRINDING MACHINE 4 Sheets-Sheet 3 Filed March 5, 195a INVENTORS v J 79% A IHIIHH I eunhav vMufl' mn PHvm A. ZxKOuFQS DonoAd 5 'Cos+e\\ o ROLL GRINDING MACHINE 4 Sheets-Sheet 4 Filed March a, 1968 INVENTORS V- uHqren 3- Z\Km*o-s D dd 5; .Cbs-\'c \0 6 unnq mvm 62d BY v Dela" M9 IWMQKORN YS United States Patent Offioe 3,566,515 Patented Mar. 2, 1971 U.S. Cl. 29-560 6 Claims ABSTRACT OF THE DISCLOSURE A grinding machine provided with a detachable assembly for substituting a grooving cutter for a grinding wheel and driving the cutter from the grinding wheel spindle. Drive means are also provided for synchronizing movement of the grinding wheel carriage with rotation of the roll to be grooved.

This invention relates to roll grinding machines and more particularly relates to roll grinding machines having capability for grooving rolls.

In the paper-making industry in many applications rubber covered rolls are used in de-watering of paper products. It has been found that in many cases by grooving these rubber covered rolls they are much more eflicient in removing water than the use of a plain rubber covered roll with a smooth surface.

This invention provides a new and improved mechanism in a. roll grinding machine to synchronize the longitudinal movement of circular cutters for grooving roll with rotation of the roll and further provides a new and improved grooving cutting apparatus which may be substituted on the wheel head for the grinding wheel with great facility. Thus, with apparatus embodying the invention the roll may be finish ground. Then the grinding wheel is removed and a grooving cutter attachment substituted therefor. The wheel head carrying the grooving cutter is then synchronized in longitudinal motion along the length of the roll with rotation of the roll itself.

An object of this invention is to provide new and improved apparatus for grooving the face of a calender roll.

Another object of this invention is to provide a new and improved grooving attachment which may be substituted for a grinding wheel.

A further object of this invention is to provide new and improved means for longitudinally moving a grooving cutter along the face of a calender roll in synchronizing with the rotation of the roll.

The features of the invention which are believed to be novel are set forth with particularity and distinctly claimed in the concluding portion of the specification. However, the invention both as to its operation and organization, together with further objects and advantages thereof, may best be appreciated by reference to the following detailed description taken in conjunction with the drawings, in which:

FIG. 1 is an elevation of a grinding machine embodying the invention;

FIG. 2 is a view seen in the plane of lines 22 of FIG. 1 and partially cut away in section;

FIG. 3 is an enlarged view of the drive mechanism of FIG. 1 and partially cut away to illustrate the drive mechanism;

FIG. 4 is an enlarged view of a portion of the grinding wheel head shown in FIG. 2 with the grinding wheel removed and a grooving attachment mounted to the grinding wheel head;

FIG. 5 is a plan view of the apparatus of FIG. 4;

FIG. 6 is a sectional view seen in the plane of lines 66 of FIG. 4;

FIG. 7 is a view seen in the plane of lines 77 of FIG. 6;

FIG. 8 is a schematic diagram of an electrical control circuit utilized in conjunction with the disclosed apparatus; and

FIG. 9 is a view in enlarged section of a portion of the machine shown in FIGS. 1 and 2.

The invention may be embodied in a grinding machine 10 of the type adapted to have two wheels grind a calender roll. The grinding apparatus generally comprises a bed or base 11 having neck rests 12 and 12a movable along the lengh thereof on ways provided therefor (not shown). The neck rests 12 and 12a are arranged to support a calender roll thereon which may be of the type having a rubber coating or layer 13 thereon. The roll is rotatably driven through a headstock motor 14 and suitable gearing which is mounted upon a base 15. The drive means further includes a drive shaft 16 connected to one end of roll R.

A carriage 17 moves along the length of bed 11 on ways 18 and 19. The machine illustrated is of the swing rest type wherein a swing rest 20 is supported on carriage 17 by means of links 21 connected to the upper part of carriage 17 at 22 and the lower portion of swing rest at 23. This swing rest arrangement reduces to a minimum small inaccuracies which may be imparted to the roll from a variety of causes, such as uneven settling of the machine foundation, warpage of the bed due to seasoning, distortions in the machine caused by changes in temperatures, etc.

Carried on swing rest 21 on opposite sides of a roll mounted to neck rests 12 and 12a are sub-carriages 24 and 25, each movable toward and away from a roll R on ways (not shown). A typical way construction for movement of the sub-carriage toward and away from the axis of rotation of a roll is shown in US. Pat. Re. 25,794. Wheel heads 26 and 27 are mounted to each of sub-bases 24 and and are pivotal thereon as shown at 28 to permit tilting infeed and outfeed of the grinding wheel heads.

The carriage 17 carries thereon a traveling nut 29 which threadably receives traverse screw 30 supported on base 11. Upon rotation of lead or traverse screw 30, nut 29 moves along the length thereof carrying carriage 17 therewith.

Reference is now made to FIG. 3. The roll driving assembly includes a yoke which connects the spindle 36 of the headstock to driving shaft 16. Driving shaft 16 is in turn connected through a yoke 38 to a yoke adaptor 39 which in turn includes a dog 40 adapted to receive the end of a journal of roll R and rotate roll R on journal rests 12 and 12a. Mounted to the headstock structure is a support member in the form of a gear case 41 which rotatably supports an idler spur gear 42 on a shaft 43 by means of bearing assemblies 44. Spur gear 42 is driven by a drive gear 45 mounted to spindle 36. Idler gear 42 further engages a driven gear 47 rotatably mounted to the end portion 48 of a shaft 49 by means of bearing assemblies 50. Shaft 49 is further rotatably supported in case 41 by bearing assemblies 51. Gear 47 carries thereon a clutch adaptor 52 to which is mounted a clutch 53 positioned about shaft 48. Clutch 53 is of the electrically actuated type. When the drive 54 and drive 55 elements are engaged gear 47 is non-rotatable with respect to shaft 49, and will drive shaft 49. If clutch elements 54 and 55 are not engaged gear 47 will merely rotate about shaft 49 on bearing assemblies 50.

The other end of shaft 49 is rotatably mounted in a gear case 56 and carries thereon a gear 57. Gear 57 engages a gear 58 on the end of shaft 59 which includes traverse screw 30. Shaft 59 is supported on bed 11 as shown at 60. Shaft 59 is connected at the end thereof to the driven element 61 of a coupling member 62. The driving element 63 of coupling 62 is rotatably mounted to shaft 64 driven by a motor 65 through a gear box 66. A clutch 67 having a driving member 68 on shaft 64 is electrically actuated to engage a driven member 69- connected to coupling member 63.

At this point it may be noted that if clutch 53 is engaged and clutch 67 disengaged, shaft 49 drives shaft 59 and traverse screw 30 through gears 57 and 58. When clutch 53 is disengaged and clutch 67 engaged, shaft 59 and traverse screw 30 will be driven from motor 65 and gear box 66. In this manner, the movement of the carriage 17 along ways 18 and 19 may be synchronized with the speed of rotation of roll R.

Reference is again made to FIGS. 1 and 2. Each grinding wheel 78 is normally driven by a motor 70. Each motor 70 has a pulley 71 on the shaft thereof and idler pulleys 72, 73 and 74 define a path for a drive belt 75. The belt 75 passes about a pulley 7-6 at one end of the grinding wheel spindle 77 and the grinding wheel 78 is mounted to the other end of the spindle.

Each grinding wheel is received within a housing 79 which is shown in FIG. 2 with its cover removed. The grinding wheel end of spindles 77 are tapered (FIG. to receive the grinding wheel thereon. When it is desired to arrange the grinding machine for grooving the wheel guard cover (not shown) is removed from the grinding wheel housing 79 and then nut 81 is removed from the threaded end of the spindle and the grinding wheel removed.

At this time, a cutter head assembly 82 (FIGS. 4 and 5) is mounted to grinding wheel head 26 and is adapted to be driven through spindle 77. Cutter head assembly 82 comprises a housing member 83 which rotatably mounts therein a shaft 84. Mounted to shaft 84 are pulleys 85 and 86. Assembly 82 is mounted directly to grinding wheel guard or housing 79 as by means of a plurality of bolts 82a which are received through mounting arms or flanges 82b extending from housing in the existing bolt holes for the removed cover plate.

When this change in the mode of operation is to occur, a spindle pulley 87 is placed on the tapered end of spindle 77 and pulleys 85 and 87 are connected by an endless timing belt 88. When motor 70 drives spindle 77, pulley 85 drives shaft 84 and in turn pulley 86. Mounted to housing 83 and included within assembly 82 is a housing 89 for a cutter spindle 90. Spindle 90 receives on the end thereof a timing pulley 91 which is connected to timing pulley 86 by means of an endless timing belt 92. The back side of belt 92 passes beneath a tension-adjusting pulley 93 carried on an adjustable arm 94 extending from a bracket 95 adjustably mounted to housing 83. Spindle housing 89 is secured to housing 83 by a plurality of bolts 96 received in oversized passages 97 in the flanges 98 on housing 89.

The cutter head is mounted to spindle 90 as by means of a collar 99 and nut 100 threadably received on the end of spindle 90. The cutter head may carry a plurality of cutters 101 adapted to groove the surface of roll R.

In operation, when spindle 77 is driven, pulley 85 drives shaft 84 which in turn drives pulley 86, timing belt 88 and timing pulley 91. The cutters are then rotated and will cut into the surface or rubber coating on roll R as carriage 17 moves along the length of bed 11. By virtue of the couplings previously described, the carriage moves at a speed synchronized with rotation of the roll so that the grooves defined in the surface of the roll have a predetermined pitch.

Spindle housing 89 has an annular projection 102 thereon which is received in a mating socket 103 defined in an adjusting block 104 having upper and lower inclined surfaces 105 and 106 defining a longitudinal slot in housing member 83. This longitudinally extending slot provides a mounting means for housing 89. Adjusting block 104 is received in housing 83 as shown more clearly with respect to housing 83 by means of a bolt 109a car-.

ried in bracket 108. Bracket 108 is carried on block 104 by means of bolts 109. Block 104 is so positionable to allow the introduction of the grooving cutters at the proper lead position into a previously grooved roll.

Spindle housing 89 together with spindle therein is adapted to have limited rotational movement about the axis of projection 102 in socket 103. Such rotational motion is provided as a means for inclining the angle of the cutter blades 101 to give a predetermined degree of lead to the spiral grooves defined on a roll R. To provide a predetermined degree of tilt, the bolts 96 are loosened in their oversized apertures. The spindle head may now be tilted to a calibrated position by means of an assembly shown in FIGS. 6 and 7. An adjusting screw or bolt 110 having a cylindrical shank portion 111 is received in flanged bearings 112 disposed within a bushing 113 in a bore in adjusting block 104. The flanged bearings are retained in position between the head of bolt 110 and a nut 110a threadably received on threaded portion 114 of adjusting bolt 110. The threaded portion 114 is further received in an adjusting nut 115 which is connected as by means of a pin 116 to a block 117 secured to the underside of spindle head 89 as by means of bolts 118.

When adjusting bolt 110 rotated, it will produce longitudinal motion in adjusting nut 115 inasmuch as nut 115 cannot rotate because of the pin connection to block 117. Such longitudinal motion of nut 115 produces similar longitudinal motion of block 117 which results in a torque on spindle head 89 about the center of projection 102. The head of nut 110 may-be calibrated as shown in FIG. 6 in degrees or fractions thereof to permit the operator to set the desired pitch of the spindle head 89 and hence the cutter blades 101.

It may thus :be seen that the cutter head assembly may be mounted to the grinding machine in place of a grinding wheel with great facility and driven directly from the grinding wheel spindle. Moreover, the spindle itself may be adjusted longitudinally with respect to the cutter head assembly as by means of bolt 109a, and may be pitched by means of the pitch or helix adjusting mechanism of FIG. 6.

The engagement of clutches 53 and 62 are controlled by their coils 53d and 62d, respectively, which may be selectively energized through lines 120 and 121 (FIG. 8) and commutator and brush assemblies (not shown). The energization of the clutches is controlled by relays 53a and 62a which are also connected across lines 120 and 121. When switch 122 is in a first position indicated at G, relay 53a in line 123 is energized. When relay 53a is energized it drops out its contact 53b in line 124 to prevent energization of clutch 67 and picks up its contact 53c in lines 120 and 121 to energize coil 53d. When this occurs, clutch 53 is engaged and shaft 49 is driven from spindle 36 and, in turn, through gears 57 and 58 drives shaft 59. At this time the traverse of the grinding wheel carriage 17 along bed 11 is synchronized with the rotation of drive shaft 16 and, hence, roll R.

When the machine is to be operated solely in the grind ing mode the switch 122 is thrown to the terminal or position marked C. This will open line 123 and close line 124. At this time relay 62a is energized, it drops out its con tact 62b in line 123 and picks up its contact 626 to energize coil 62d. Clutch 62 is engaged and shaft 59 with traverse screw 30 thereon is driven directly from motor 65 and gear box 66. During this operation, clutch 53 is not engaged and shaft 49, which is back driven through gear 57 merely rotates with respect to gear 47 in bearing assembly 51.

The apparatus may also include mechanism for imparting curvilinear motion to the grinding wheel heads 26 and 27 as they travel along the length of a roll. As previously pointed out, each grinding wheel head is pivotally mounted to its carriage at 28. The rear end of wheel heads '26 and 27 are supported through a cam follower 120 on an eccentrically adjustable crowning cam 121. Cam 121 has rotatably secured therein substantially diametrically thereacross a lead screw 122. Screw 122 carries a cOllar 123 having dimensional graduations thereon, and is threadably received through shaft 124. One end 125 of screw 122 is hexagonally formed to allow it to be rotated by a wrench or similar device. Cam 121 is retained in place by a clamping disc 126 and nut 127. Upon rotation of screw 122 the center of cam 121 is displaced with respect to the axis of shaft 124. Accordingly, cam 121 is made eccentric with respect to shaft 124 Reference is now made to FIGS. 1 and 2. Shaft 124 is rotated with movement of carriage 17 along the bed of the machine by reason of the connection of a pinion 128 to a rack 129 on bed 11. The pinion 128 is affixed to a shaft 130 which carries thereon a worm (not shown) in engagement with a worm gear 131 on shaft 124. With this arrangement, when shaft 124 is coaxial with cam 121 rotation of shaft 124 will impart no vertical movement to cam follower 120. However, when cam 121 is positioned to be eccentric with respect to shaft 124 movement of the carriage along the bed will impart vertical movement to cam follower 120 and, hence, provide provision for grinding a crown on the roll.

It will be apparent that this control will be utilized with the grooving assembly when a roll to be grooved has previously been provided with a crown.

-It may thus be seen that the objects of the invention set forth above as well as those made apparent from the foregoing description are efficiently attained. Other embodiments of the invention and modifications to the disclosed embodiment thereof which do not depart from the spirit and scope of the invention may occur to those skilled in the art. Accordingly, the appended claims are intended to cover all modifications and embodiments of the invention which do not depart from the spirit and scope thereof.

What is claimed is:

1. For use in combination with a roll grinding machine having means for rotatably supporting a roll, first drive means for rotating the roll, a base, a carriage including a grinding wheel head movable along said base, second drive means for moving said carriage, said wheel head having a power operated spindle normally adapted to receive a grinding wheel thereon: a groove cutting assembly comprising a first housing member rotatably mounting a shaft therein, at least one grooving cutter thereon, a

second housing member mountable to said wheel head, said second housing having power transmission means for connecting said shaft to the spindle, said second housing member having mounting means adapated to movably mount said first housing member so as to allow selection of the longitudinal position of said at least one grooving cutter along a roll on the grinding machine.

2. The assembly of claim 1 wherein a slot is defined in said second housing member longitudinally with respect to a roll on said machine and slidably receives therein a block carried by said first housing member.

3. The assembly of claim 1 wherein said first housing and second housing are constructed and arranged to permit limited pivotal movement of said first housing with respect to said second housing.

4. The assembly of claim 1 further defined in that said first housing includes a mounting member received in said mounting means of said second housing, said mounting member having a cylindrical socket defined therein, said first housing having a cylindrical projection received in said socket, a plurality of clamping bolts passing through enlarged bores in said first housing member and received in said mounting member, and cooperating means on said mounting member and said first housing member for imparting pivotal motion to said first housing member with respect to said mounting member.

5. The assembly of claim 3 wherein said cooperating means comprises a screw on said mounting member and a nonrotatable nut on said first housing member receiving said screw.

6. The combination of claim 1 further including means for disabling said carriage drive means and connecting said roll drive means to move said carriage in timed relation to rotation of the roll.

References Cited UNITED STATES PATENTS 780,972 1/ 1905 Bowen 51-49X 1,227,304 5/ 1917 Pedrick 8283X 2,359,255 9/ 1944 Smith 8221.2X 3,088,250 5/1963 Holt et a1 5149 2,641,970 6/1953 Plummer.

2,994,995 8/1961 Grifiith 51-134.5

OTHER REFERENCES 319,685 2/1957 Switzerland 160,959 2/ 1964 U.S.S.R.

ANDREW R. JUHAS, Primary Examiner Z. R. BILINSKY, Assistant Examiner

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