CA1055206A - Device and method for operation in an helical pattern inside a cylinder - Google Patents

Abstract

DEVICE AND METHOD FOR OPERATION IN
AN HELICAL PATTERN INSIDE A CYLINDER
ABSTRACT OF THE DISCLOSURE
A DEVICE AND METHOD FOR PERFORMING AN OPERATION ALONG AN
HELICAL PATH ON THE INSIDE SURFACE OF A HOLLOW CYLINDRICAL ROLL
FROM ONE END OF THE ROLL TOWARD THE OTHER END, THE DEVICE COM-PRISING:
a) A CARRIAGE SUPPORTED ON A PLURALITY OF WHEELS HAVING
AXES ORIENTED IN A DIRECTION GENERALLY PARALLEL TO THE AXIS OF A
ROLL UPON WHICH AN OPERATION IS TO BE PERFORMED:
b) THE CARRIAGE HAVING A SUPPORT BRACKET ADJUSTABLY
SECURED THEREON WITH FIRST MEMBERS FOR ADJUSTING THE BRACKET IN A
DIRECTION GENERALLY PARALLEL TO THE AXES OF THE WHEELS;
(c) A TOOL HELD IN A CLAMP SUPPORTED BY THE BRACKET FOR
PERFORMING AN OPERATION ON THE INSIDE SURFACE OF A ROLL; AND
d) FOLLOWER MEMBER EXTENDING GENERALLY IN A PORTION OF AN
HELICAL PATTERN ON THE UNDERSIDE OF THE CARRIAGE FOR COOPERATION
WITH A GUIDE ELEMENT TO MAINTAIN THE TOOL OPERATING ALONG AN
HELICAL PATH OF THE ROLL RECEIVING AN OPERATION FROM THE TOOL.
THE METHOD COMPRISES THE STEPS OF:
a) SUPPORTING A ROLL FOR ROTATION WITH ITS AXIS EXTENDING
IN A GENERALLY HORIZONTAL DIRECTION;
b) SUPPORTING A TOOL ASSEMBLY ON THE INSIDE SURFACE OF THE
ROLL WITH ROTATABLE SUPPORTS IN A MANNER TO PERMIT ROLLING MOVE-MENT OF THE SUPPORTS WHEN THE ROLL IS TURNED BUT ALSO CONSTRAINING
THE SUPPORTS AND THE TOOL ASSEMBLY TO MOVE IN THE PATH OF AN HELI-CAL PATTERN FROM ONE END OF THE ROLL TO THE OTHER AS THE ROLL IS
TURNED;
(c) PROVIDING THE TOOL ASSEMBLY WITH A TOOL EXTENDING IN
POSITION TO PERFORM AN OPERATION ON THE INSIDE SURFACE OF THE

ROLL: AND
d) TURNING THE ROLL AT A SLOW RATE OF ROTATION WHEREBY
THE TOOL ASSEMBLY WILL MOVE ACROSS THE INSIDE SURFACE ALONG AN
HELICAL PATTERN WITH THE TOOL THEREOF PERFORMING AN OPERATION ON
THE INSIDE SURFACE OF THE ROLL ALONG AN HELICAL PATTERN.

Description

lOSS'Z06 BACICGROUND OF THE INVENlION
1. Field of the Invention The field of the invention relates to perforated suction rolls of the type used in machinery for manufacturing paper or ~ related products thereof. Rolls of this type include forming cylinders, couch rolls, and the like. More particularly, this invention relates to an apparatus and method for forming a clean-ing groove on the inside surface of a suction roll against which sealing elements are pressed in operation of the suction roll.

2. Description of the Prior Art Of the prior art known to applicant, U.S. Patents No.
1,512,520 (Burt et al) and No. 2,979,993 (Hedstrom) are noted as being of possible relevance. Burt et al is of interest in that it relates to a machine for forming threads on the inside surface of a sleeve or like member. In Burt et al the bore of the sleeve member on which threads are formed appears to be conical. The Hedstrom patent also relates to an apparatus for forming helical threads or grooves on the inside surface of a sleeve member. The inside of the sleeve member of Hedstrom appears to be cylindrical prior to the formation of the threads.
The cutting tool in Burt et al and Hedstrom are both sup-ported from a machine having a base outside the respective pieces worked on so that travel of the tool within a long work piece would be limited by the shaft length of the machine.
SUMMARY OF THE rNVENTION
The present invention relates to a new and improved appara-tus and method for performing an operation on the inside surface -- 1 -- .~

lOSSZ06 - ,~
of a hollow cylindrical roll.
A principal object of this invention is to provide a tool for machining a continuous groove on the inside of a cylindrical shell.
Another object of this invention is to provide a method for supporting a powered machining cutter or single tool cutter inside a cylindrical shell to effect a groove-cutting operation therein~ -It is another object of this invention to provide an apparatus and method for controlling the pattern of a machinedgroove or grooves with respect to depth, width, contour, spiral pattern, or concentric pattern on the inside of a cylindrical shell.
It is a further object of this invention to provide an apparatus and method for automatically advancing and guiding a machining cutter or tool to suit desired groove spacing or pattern.
Still another object of this invention is to provide an apparatus and method for automatically advancing and guiding a machining cutter or tool to conform to a drilled hole pattern in a cylindrical, drilled shell.
- . Yet another object of this invention is to provide an apparatus and method for manually adjusting a machining cu~ter's position to compensate for variations in the drilled hole pattern in a drilled cylindrical shell.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 shows a view in perspective of the apparatus or device installed inside a cylindrical roll for operation accord-ing to the invention;
Fig. 2 shows in perspective and on an enlarged scale a por-10552~)6 -~-tion of a guide element forming part of this invention;
Fig. 3 shows on an enlarged scale a sectional view taken along the line 3-3 in Fig. l; and Fig. 4 is a sectional view taken along the line 4-4 in Fig. 3.
DETAILED DESCRIPTION OF THE INVENTION
Referring now to the drawings in detail, the reader will readily appreciate that Fig. 1 shows a hollow cylindrical roll 10 of the type suitable for use as a suction roll in the manufacture of paper. The roll 10 may be used as a forming cylinder, a couch roll or like device having perforations in the shell thereof for the passage of and/or holding of water therein in the process of -manufacturing paper. The roll 10, as may be readily seen, is a hollow shell 12 having an outer cylindrical surface 14 and an inner cylindrical surface 16. Shell 12 is formed with a plurality of groups A, B, C, etc. of perforations 18 extending from outer surface 14 to inner surface 16. Each group of perforations 18 is formed on an helical pattern on the shell 12 with the pattern of each group being similar to and spaced apart from each other.
A guide element 20 is seen in Fig. 1 to be secured in place against the inner surface 16 of shell 12. The guide ele-ment 20 is disposed over one group of perforations 18 and extends along the helical pattern thereof. The guide element 20 has on the surface directed toward the inner surface 16 of shell 12 a plurality of plugs 22 which are snapped into the perforations 18 of the one group of plurality of perforations over which the guide element is disposed. To ensure secure attachment of guide element 20, each plug 22 is formed with a bore 23 into which a pin or bolt 24 may be threadedly engaged. The guide element 20 may be made from any suitable material which would facilitate shaping to conform to the helical pattern illustrated, Use of polyamide material to form the guide element 20 has been found to be satisfactory.
To carry out the objective of performing an operation on the inside of the roll 10, a drilling jig 26 has been conceived and put to use. Drilling jig 26 comprises a carriage 28 with a groove or follower means 30 on the underside thereof. Carriage 28 includes a plurality of rollers or wheels 32 mounted on axles -or stub shafts 34. In use of drilling jig 26 for the intended purpose of the invention, carriage 28 is placed inside a shell 12 which is supported in a horizontally extending position. The carriage 28 is placed in shell 12 so that the axes of the wheels 32 and axles or stub shafts 34 extend in a direction generally parallel to the axis of the shell 12 and also with groove 30 extending over and around portions of the exposed surfaces of guide element 20. Groove 30 must extend in the path of an heli-cal pattern conforming to that of the groups A, B, C, etc. of perforations 18 and in particular to that helical pattern of - guide element 20 which is disposed over and secured to one of the groups of perforations 18.
Adjustably secured by bolts 38 on the top side of carriage 28 is a support bracket 36. A key 40 disposed between keyway portions in carriage 28 and bracket 36 ensures aligned adjustment of bracket 36 when bolts 38 are loosened. An index plate 42 is secured to carriage 28 by bolts 44 and has a portion extending upwardly beside bracket 36. A threaded adjustment bolt 46 extends through an oversize bore 48 in index plate 42 and is threaded into a portion of bracket 36. Pairs of lock nuts 50 are provided on bolt 46 on opposite sides of index plate 42 after sup-port bracket 36 is located in a desired position. To adjust the 1055ZC~6 - ~-position of bracket 36, it is necessary to loosen bolts 38, loosen lock nuts 50, move bracket 36 in the desired direction along key 40, tighten lock nuts 50 and bolts 38. Movement of bracket 36 along key 40 will vary the position of bracket 36 and any tool carried or supported thereon with respect to carriage 28, guide element 20 and the groups A, B, C, etc. of perforations in the axial direction of the roll 10, so that operation of a tool will be closer to, farther away from, or even over any particular group of perforations 18.
Adjustably secured on support backet 36 is a tool clamp 52 in which the housing 54 of a power driven tool is secured. At the working end of the power driven tool is a router device 56.
It is to be understood that while the driven tool is illustrated with a router device 56 on the working end thereof, any suitable tool may be provided thereat to perform a desired operation. For example, instead of router device 56, a reciprocating tool, a paint brush, or whatever desired tool may be incorporated thereat to perform an operation along an helical path inside a drilled `` roll.
To vary and/or control the effective working depth of the tool in a radial direction with respect to roll 10, an adjust-ment screw 58, which is similar in operation to adjustment screw 46, is provided. Adjustment screw 58 extends in a direction parallel to or in a radial direction and is threaded to tool clamp 52 so that adjustment will effect the working depth of tool 56. Adjustment screw 58 extends through an oversized bore 60 in an index plate portion 62 of bracket 36 by pairs of lock nuts 64 on opposite sides of index plate portion 62 of bracket 36. Tool clamp 52 is secured to bracket 36 by a plurality of bolts 66, which when loosened along with lock nuts 64 will facilitate 10552~)6 - C -adjustment of tool 56 toward or away from the inner surface 16 of shell 12 by turning adjustment screw 58. To ensure straight line adjustment of tool 56 a key 68 is provided between tool clamp 52 and the cooperating portion of support bracket 36. After the desired working depth of tool 56 has been obtained by adjusting screw 58, lock nuts 64 and bolts 66 are tightened to secure tool 56 in the desired working position.
Fig. 4 shows three portions of guide element 20 all of which lie on the path of an helical pattern. According to the operation of the instant invention, carriage 28 and the tool 56 are moving from left to right so that an helical groove 70 has been cut by tool 56 and appears to the right of guide element 20 at the left side of Fig. 4. At the center of Fig. 4 tool 56 is in the process of continuing the cutting on the right of guide element 20 of groove 70, which does not appear to be cut behind tool 56. At the right side of Fig. 4 the portion of the inner surface 16 to the right of guide element 20 stands waiting for arrival of tool 56 and continuation of formation of helical groove 70.
Drive means are broadly represented in Figs. 1 and 3 at D
for slowly turning roll 10 at a very slow rate of speed in carry-ing out the operation with the present invention. Roll 10 must be understood to be supported in a generally horizontal po~ition for rotation about its horizontal axis. In carrying out the method of performing an operation along a path conforming to an helical pattern on the inside surface 16 of a hollow cylindrical shell 12 of a roll 10 rotatably supported about its axis, a drill-ing jig 26 is disposed on the inner surface 16 of shell 12, with power tool 56 turned on and the roll rotated at a low rate of speed. With groove 30 of carriage 28 disposed in straddle rela-11~3552~6 - 7-tionship over guide element 20 and cutting being effected by routing tool 56, carriage 28 will move from left to right in Fig. 1 if roll 10 is rotated in the counterclockwise direction as driven, for example, by a friction wheel D which must be turn-ing in the clockwise direction. Considering Fig. 3 along with Fig. 1, as the roll 10 is turned in the counterclockwise direc-tion indicated by the arrow in Fig. 3, carriage 28 by reason of gravity will seek its lowest level with wheels 32 turning and rolling on inner surface 16 of shell 12. As carriage 28 seeks its lowest level when roll 10 is turned in the counterclockwise direction, carriage 28 will move both in the clockwise direction and also be constrained to move and trace the path of the helical pattern of guide element 20 disposed over and secured along the pattern of a group of perforations formed in the surface of shell 12. In thus tracing the path of an helical pattern, carriage 28 and tool 56 carried thereby will also move and operate from one end of shell 12 to the other end thereof.
With suitable adjustment of either or both adjustment screws 46 and 58, desired adjustments may be made to position tool 56 with respect to its distance to and/or from the helical path of a group of perforations 18 and guide element 20 and also with respect to its depth of cut with respect to the inner sur-face 16 of shell 12. Rotation of roll 10 at a low relative speed is necessary to ensure optimum operation according to the present invention.
EXAMPIE OF THE INVENTION
Applicant has reduced the invention disclosed herein to practice, and by way of example notes that suction rolls 10 having shells 12 with diameters of the order or forty to forty-eight inches have had helical grooves 70 successfully produced on 1~55;~the inner surface 16 with the device and by the method disclosed and claimed herein. The device that has been reduced to prac-tice used a router tool 56 having a rated speed of 23,000 rpm with the speed of rotation of suction roll 10 being between two to fifteen linear inches per minute in the formation of groove 70. In actual practice rotation of suction roll 10 may be effected by hand as well as by the illustrated friction wheel D.
The speeds of rotation of the router tool 56 and of suction roll 10 and the diameter sizes of suction roll 10 noted above are men-tioned by way of example only and are not to be considered in alimitative sense, as numerous variations thereof are within the contemplation and scope of the inventive concept disclosed herein.
Use of the invention as described and illustrated herein provides the following advantages:
1. Compactness in a portable fixture for mounting and guiding a powered machining cutter or single tool cutter.
2 Adaptability to machining a groove on the inside of any cylindrical drilled shell regardless of drill pattern.

3. Automatic advancement and guided positioning of cutter head or tool.

4. Manual adjustment of cutter head or tool, if necessary, to compensate for drilled hole pattern variations in a drilled shell.
The invention disclosed and claimed herein as expressed in ordinary descriptive terms relates to a device for performing an operation along an helical path on the inside surface of a helical path on the inside surface of a hollow cylindrical roll from one end of the roll toward the other end, which device com-prises:
a) a carriage supported on a plurality of wheels having l~S5Z~36 axes oriented in a direction generally parallel to the axis of a roll upon which an operation is to be performed;
b) the carriage having a support bracket adjustably se-cured thereon with a member for adjusting the bracket in a direc-tion generally parallel to the axes of the wheels;
c) a tool held in a clamp supported by the bracket for performing an operation on the inside surface of a roll; and d) follower element extending generally in a portion of an helical pattern on the underside of the carriage for coopera-tion with a guide element to maintain the tool operating along anhelical path of the roll receiving an operation from the tool.

Claims (5)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. Device for performing an operation along an helical path on the inside surface of a hollow cylindrical roll from one end of the roll toward the other end, said device comprising:
a) a carriage supported on a plurality of wheels having axes oriented in a direction generally parallel to the axis of a roll upon which an operation is to be performed;
b) the carriage having a support bracket adjustably secured thereon with first means for adjusting said bracket in a direction generally parallel to the axes of said wheels;
c) a tool held in a clamp supported by said bracket for performing an operation on the inside surface of a roll; and d) follower means extending generally in a portion of an helical pattern on the underside of said carriage for cooperation with a guide element to maintain said tool operating along an helical path of the roll receiving an operation from said tool.

2. The device as defined in claim 1 wherein said bracket also includes means for adjustably locating said tool to control the depth of its operation on the inside surface of a roll.

3. The device as defined in claim 2 wherein said carriage in operation of said device is placed inside a horizontally oriented roll with the wheels of said carriage freely supported on the inside surface of the roll and the axes of said wheels being generally parallel to the axis of the roll, and with the follower means in cooperating engagement with a guide element pro-vided on the inside surface of the roll.

4. The device as defined in claim 3 wherein the guide ele-ment extends on an helical path on the inside surface of the roll from one end of the roll to the other end thereof and the tool is supported to perform an operation on the inside surface of the roll along the path of an helix similar to but spaced apart from the helix of the guide element.

5. The device as defined in claim 4 wherein the roll which is operated on by said tool comprises a plurality of spaced-apart groups of perforations in the surface thereof with each of said groups of perforations being located in an helical pattern from one end of the roll to the other.