|Publication number||US3478974 A|
|Publication date||Nov 18, 1969|
|Filing date||Jan 2, 1968|
|Priority date||Jan 2, 1968|
|Also published as||DE1900160A1, DE1900160B2|
|Publication number||US 3478974 A, US 3478974A, US-A-3478974, US3478974 A, US3478974A|
|Inventors||Nelson Edgar L, Roscoe Howard E|
|Original Assignee||Fmc Corp|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (2), Referenced by (15), Classifications (8)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Nov. 18 1969 H. E. ROSCOE ETAL 3,478,974
' ROLL STAND FOR CONVERTING EQUIPMENT Filed Jan. 1968 4 Sheets-Sheet 1 F'I[E'| E INVENTORS HOWARD E. ROSCOE EDGAR L.NELSON JZU W ATTORNEYS Nov. 18, 1969 Filed Jan. 2, 1968 P RUNNING POSITION LOADING POSITION H. E. ROSCOE ETAL 3,478,974
ROLL- STAND FOR CONVERTING EQUIPMENT 4 Sheets-Sheet 2.
INVENTORS HOWARD E. ROSCOE EDGAR L.NELSON ATTORNEYS Nov. 18, 1969 H. E. Ro scoE ETAL 3,478,974
ROLL STAND FOR CONVERTING EQUIPMENT Filed Jan. 2, 1968 4 Sheets-Sheet 4 INVENTORS HOWARD E. ROSCOE EDGAR L.NELSON BYEW ATTORNEYS United States Patent ROLL STAND FOR CONVERTING EQUIPMENT Howard E. Roscoe, Brown County, Wis., and Edgar L.
Nelson, Menominee County, Mich., assignors to FMC Corporation, San Jose, Calif., a corporation of Delaware Filed Jan. 2, 1968, Ser. No. 695,077 Int. Cl. B65h 19/30 US. Cl. 24258 14 Claims ABSTRACT OF THE DISCLOSURE ning position. While one mill roll is being unwound the operator then mounts another mill roll on the other end of the shaft.
BACKGROUND OF THE INVENTION Field of the invention This invention relates to an unwind stand for flexible webs used in various converting operations.
Description of the prior art Converting equipment such as printing presses, bag machines and napkin machines are supplied with one or more mill rolls of flexible web material wound on a paper core. Imprinting presses it is usual to provide an unwind stand for paying out the web to the printing stations and a rewind stand for winding the printed web. To place a new roll on the unwind stand, a heavy core shaft is inserted through the core whereupon the roll is picked up by a crane and positioned on the unwind stand which is supplied with bearings, usually of a split type, for supporting the core shaft. Supplying a new mill roll to converting equipment requires interruption of production and it also requires the operator to handle a heavy core shaft.
By virtue of the present invention, the down time of the converting equipment is reduced and the steps involved in supplying a new mill roll to converting equipment is simplified by eliminating the necessity of handling heavy equipment by the operator.
SUMMARY OF THE INVENTION It is an important feature of the present invention to provide a core shaft arrangement having a running position and a loading position such that when the web of the roll in the running position has been exhausted, the mill roll in the loading position can be quickly located in the running position. To this end, an elongate center supported core shaft is mounted on a pivotal support which permits rotation of the core shaft in a horizontal plane. When one portion of the core shaft is located in the running position, an outboard support engages the end of the shaft and thus renders it rigid as the web is unwound.
It is a further and equally important feature of this invention to simplify the procedure in mounting a mill roll on a converting machine. The method disclosed herein obviates the necessity of inserting a core shaft into the mill roll core tube since the roll supporting core shaft is arranged to provide a loading position and it is permanently carried by the machine frame. All that is required to prepare a mill roll for unwinding operation is to lift,
usually by means of a crane, the mill roll onto the core shaft while the same core shaft carries a mill roll which is being unwound. Not only does this relieve the operator of unnecessary core shaft handling, but a full mill roll is in ready postion while the converting machine is in operation.
Further, in accordance with this invention, a novel mechanism is provided for accurately centering the mill roll at the unwind position. These means preferably comprise a reversibly rotatable shaft geared to rotate the core shaft in opposite directions. The core shaft is connected to left and right hand screws which effect axial movement of the core shaft, to the left or to the right when it is rotated. Centering can be accomplished from a remote position during running of the mill roll.
BRIEF DESCRIPTION OF THE DRAWING FIGURE 1 is a side elevation of tandem unwind stands for supplying web material to a napkin folding machine.
FIGURE 2 is a plan view of the structure shown on FIGURE 1.
FIGURE 3 is an enlarged off-set section of one unwind stand taken substantially along the line 3-3 of FIG- URE 6.
FIGURE 4 is an enlarged section of the core shaft supporting structure.
FIGURE 4A is a fragmentary section taken on the line 4A4A of FIGURE 4.
FIGURE 5 is a side elevation of the outboard support of the core shaft as viewed in the direction of the arrows 55 of FIGURE 3.
FIGURE 6 is a side elevation of the unwind stand taken substantially along the line 66 of FIGURE 2.
DESCRIPTION OF THE PREFERRED EMBODIMENT An apparatus embodying the subject matter of the present invention is shown in FIGURES 1 and 2 and it is generally designated by the numeral 10. It is preferably illustrated for use with a conventional embosser unit 12 and a napkin folder 14, the constructional details of which are unimportant in understanding the principles of the present invention. The embosser unit 12 and the napkin folder 14 are shown correlated with a plurality of inline tandem unwind stands 16A, 16B and 16C, the first second and third unwind stands respectively as viewed from left to right. Each of these stands are operated concurrently to supply webs WA, WB and WC to the embosser unit where they are laminated to provide a threeply web to the napkin folder. The napkin folder cuts and folds the laminated web and discharges the napkins in a stack on an accumulating platform. In the usual installation, each of the webs is used to supply napkins to its own discharge lane. Accordingly, it is possible, and desired in many installations to set up the napkin folder with three levels of discharge.
Each of these unwind stands includes web tension controlling means 18A, 18B and 18C and surface drive belts 20A, 20B and 20C coordinated with the tension control means to maintain a desired degree of web tension. Each of the roll stands 16A, 16B and 16B are provided with side frame members 22 and 24 for rotatably supporting a plurality of web directing idler rolls, all of which are indicated by the numeral 26.
On each of the side frame members 22 there is rigidly mounted an upwardly extending column or pedestal 28 shown in greater detail in FIGURE 3. The pedestal rotatably supports a tubular spindle 30 having a flanged portion 32 supporting a box-like structure of housing 34. Through this housing a shaft 36 extends and projects outward therefrom defining cantilevered portions 36L, the left being loading position, and 36R, right being the running position. The tubular spindle 30 is rotatably mounted inthe'column 28 by bearings 38 and the shaft 36 is mounted for rotation in the housing 34- by bearings 40. Mounting the tubular spindle for rotation relative to the pedestal 28 enables the operator to rotate shaft 36 in a horizontal plane and thereby position .themill roll carried by the shaft portion 36L to the running position while the shaft portion 36R is positioned in the loading position.
. When the cantilever shaft portions 36L or 36R are located in the running position the outboard support 42 engages the end of the shaft. As shown in FIGURE 3, the support 42 is mounted on and extends upwardly from the side frame member 24 and it includes a clamping structure 44 which is selectively engageable with a bearing 46 mounted on each end of the shaft 36. This bearing has an outer race fitted within a cup 48, as shown in FIGURE 5, that is clamped between a stationary jaw 50 and a movable jaw 52. The function of the hearing is to enable the shaft to turn within the cup when clamped between the jaws and to provide support for the shaft. The movable jaw is attached to an actuator rod 54 slidably fitted through a bracket 56. A lever 58 is pivotably connected by a pin 60 to the upper end of the outboard support 42 and it is connected at 62 to the operating rod 54. The lever 58 is also pinned to a clevis connection 64 that is attached to the rod of an actuator 66. As shown in FIGURE 3, the actuator is attached to a bracket 68 that is mounted to the 'outboard support 42.
A conventional air valve 70, shown in FIGURE 3, mounted on the side frame member 22 is connected to the actuator 66 and supplies air to retract or extend the piston rod carrying the clevis connection 64 which thereby raises or lowers the movable jaw 52. Mere inspection of the arrangement shown in FIGURE 3 makes it apparent that upon retraction of the piston, the movable jaw 52 is raised freeing the shaft 36 for translation in a horizontal plane by the operator when it is desired to locate the other cantilevered end of the shaft to the running position.
The outwardly extending ends of the shaft 36 are slidably received in elongate tubular sleeves 72, having inner ends provided with radially extending brackets 74. Extending inward from the brackets are guiding rods 76 being slidably received in bores formed in the housing 34. The guide rods 76 are for the purpose of preventing rotation of the tubular sleeves 72 while allowing axial movement relative to the shaft portions 36L and 36R. To mount a mill roll for rotation with respect to the sleeves 72, core plug structures 78 are provided and they are slidably fitted on the sleeves 72. Since each of the core plugs 78 are identical in construction, the inboard one shown in FIGURE 4 will be described in detaiL'The inner race of a bearing 80 is fixed to a step collar 82 which is slidably fitted on the tubular sleeve 72. A setscrew 84 fixes the collar to the sleeve 72. The outer race of the bearing 80 is fixed in a bellfihousing 86 having a reduced diameter extension 88 that is tapered at 90. The core, indicated by the letter C, of the mill roll is fitted over the extension 88 and the tapered portion 90 facilitates location of the core thereon. Due to the fact that the bell housing 86 rotates during unwinding of a mill roll and the fact that the tubular sleeves 72 are restrained against rotation by the guide rods 76, a bored portion 92 of the bell housing is of sufiicient diameter to be spaced from the outer surface of the tubular sleeve 72.
Since it is necessary to remove the core of an expired roll before a new mill roll can be mounted on the shaft, the outboard core plug structures 78 are removed by merely loosening the respective setscrews 84. After a new mill roll is located on the shaft portion that is inthe loading position, the core plug structure is slipped on the shaft, seated within the core and held in position by tightening its associated setscrew. It should be noted that the outside diameter of the bearing cups 48 are smaller than the inside diameter of the core plug bored portion 92 to permit removal of the core plug.
In view of the above construction, it should be readily apparent that the structure thus far described provides a core shaft having a loading and running position. While one portion of the core shaft is in the running positon, the outboard end thereof is rigidly supported to hold that portion of the core shaft steady while the mill roll is being unwound.
As mentioned in the introduction of this specification, one of the novel features of the present invention is the provision of means for accurately centering the longitudinal medium of the mill roll with respect to the desired web path of the converting machine. The particular mechanisms for accomplishing this result are shown and will be explained in connection with FIGURES 3 and 4. On the side frame member 22, a reversible motor 94 is connected to a gear reduction 96 suitably attached to the frame member 22. An upwardly extending shaft 98, mounted for rotation centrally of the tubular spindle 30, is connected to the gear reduction unit 96 by conventional sprocket chain drive 100. Geared to the upper end of the shaft 98 is a bevel pinion gear 102 (FIG. 4) in mesh with a bevel gear 104 that is keyed to the shaft 36. Also secured to the shaft 36 is a thrust disc 106 which serves to prevent axial movement of the shaft 36 relative to the housing 34. FIGURE 4A shows a bracket 108 rigidly attached to the housing 34. The bracket securely mounts stub shafts 110 which rotatably support rollers 112 to engage the opposite faces of the thrust disc 106. This arrangement accordingly prevents axial shifting of the shaft 36.
Referring to FIGURE 3 it will be observed that the ends of the shaft 36 are provided with reduced diameter threaded portions 114, one portion being threaded in a right hand manner and the other portion being threaded in a left hand manner. Each threaded portion of the shaft is engaged in tapped ends 116 of the tubular sleeves 72. Since the sleeves 72 are slidable with respect to the shaft 36 and rotation of the sleeves is prevented by virtue of the guide rods 76, rotation of the shaft 36 causes the sleeves 72 to be displaced axially by virtue of the left and right hand threaded portions 114 threadedly engaged in the tapped ends 116. Such lateral shifting is, as mentioned above, for the purpose of centering the mill roll With the converting machine.
The degree of such lateral adjustment is determined by a limit switch 118 carried by a bracket 120 which is welded or fixed, as desired, to the pedestal or column 28. As shown in greater detail in FIGURE 4, the operating rod of the limit switch 118 is mounted to a lug 122, which in turn carries a plate 124 having upwardly extending laterally spaced abutment members 126 mounted thereon. Located between the members 126 is a rod 128, attached by a nut and thread arrangement to the bracket 74. The amount of lateral translation of the sleeves 72 relative to the shaft 36 is determined by the limit switch 118. In FIGURE 4 the full line representation of a rod 128 illustrates the limit of inward translation of the sleeve 72, whereas the phantom outline representation of a portion of the shaft 128 illustrates the limit of outward adjustment of the sleeve 72.
When the reversible motor 94 is energized to move the mill roll that is in running position to the left or right, as viewed in FIGURE 3, the motor is electrically deenergized in the event the rod 128 strikes the abutment member 126-I or 126-O thus actuating the limit switch 118. When running mill rolls of a lesser width than that shown in the accompanying drawings, the centering function of the invention is not affected since the inboard core plug structure 78 are moved outwardly from the illustrated position a sufficient extent to locate the nominal center of the mill roll in substantial alignment with the converting machine. Minor adjustments can be made once unwinding is commenced by actuating the reversible motor 94. Should it be found that the limit switch 118 is actuated, electrically de-energizing the motor 94, manual resetting of the core plug structures 78 would be required.
In view of the above explanation, it is readily apparent that the invention provides the operator with controls and mechanisms to very accurately adjust the position of the mill roll so that it is centered with that of the converting machine.
At each unwind stand, the mill roll is driven by a surface drive belt similar to belt 20B, shown in FIGURE 6. This endless type belt is trained about a drive pulley 132 and a driven pulley 134, and has an upper run 136 which contacts the peripheral surface of the mill roll. The drive pulley is mounted on a drive shaft 138 that is journalled within side frame members 22 and 24, while a driven pulley 140 is mounted on the drive shaft. A variable diameter pulley 142 is mounted on an output shaft 144 (FIG. 3) of a main drive 146 and a drive belt 148 is trained about the drive pulley and variable diameter pulley. Positioned about the surface drive belt is a belt frame 150 having one end pivotally mounted upon drive shaft 138 and an opposite end in which a shaft 152 is adjustably positioned to support the driven pulley 134. The belt frame is connected to the rod of an actuator 154 which has a cylinder portion connected to a brace 156 extending transversely between the side frame members. When the actuator contracts drawing the rod into the cylinder portion, the belt frame pivots upwardly forcing the upper run 136 of the surface drive belt into driving contact with the mill roll. A constant air-pressure is maintained within the actuator as the mill roll unwinds so that the belt frame is continuously urged upward and driving contact is maintained between the surface drive belt and mill roll.
Constant web tension is maintained on a mill roll web, such as web WB, by controlling the speed at which the surface drive belt 20B is driven. The web is trained about a dancer roll 158 that is eccentrically supported from a pivotal shaft 160 and balanced by a pair of counterweights 162 to maintain a normal position. A cam 164 is fixed to the pivotal shaft in a position to contact an air regulator 166 as the dancer roll is lowered from the normal position. The air regulator is in flow communication with an actuator 168 that drives a sprocket wheel 170. An adjusting sprocket 172 is coupled with the variable diameter pulley 142 and a drive chain 174 is trained about the sprocket wheel and adjusting sprocket. Rotation of the adjusting sprocket changes the diameter of the variable diameter pulley and thereby varies the speed at which the surface drive belt is driven, An idler roll 176 is resiliently urged against the drive belt to eliminate slack and maintain proper tension on the drive belt throughout the range of diameters for the variable diameter pulley.
Operation of the roll stand begins with loading of mill rolls. The outboard core plug 78 at the loading position is removed after loosening setscrew 84. If a core C of an expired roll remains on the sleeve 72, it is removed and a new mill roll is fitted about the sleeve and seated upon the inboard core plug 78. The outboard core plug is seated within the core and locked in position on the sleeve by the setscrew. Clamping structure 44 is actuated to release the shaft 36, which is then rotated in a horizontal plane to position the new mill roll in a running position. The clamping structure is then locked about the cup 48 to hold the shaft in position and support the cantilevered end. In order to align the web of the mill roll with other Webs and processing stations, the roll can be shifted laterally by operating the reversible motor 94 to turn the shaft 36. Rotation of the shaft causes the sleeves 72 to move thereon and thus position both sleeves in the same relative position on opposite sides of the tubular spindle 30. Since bearing 46 is free to turn within the cup 48, the shaft can be rotated while the cup is locked in place by the clamping structure. Thus, the mill roll is properly aligned in a running position and the sleeve in the loading position is also aligned for running when needed. While the mill roll is running, a standby roll is loaded on the sleeve in the loading position for use when needed.
Although the best mode contemlated for carrying out the present invention has been herein shown and described, it will be apparent that modification and variation may be made without departing from what is regarded to be the subject matter of the invention as set forth in the appended claims.
Having completed a detailed description of the invention so that those skilled in the art could practice the same, we claim:
1. A web roll supporting apparatus comprising a horizontal shaft having its mid portion mounted in a housing and having cantilevered end portions extending outwardly from opposite sides of the housing, means on each shaft end portion for supporting web rolls to rotate relative to said shaft, means mounting said housing for rotation about a vertical axis whereby the shaft end portions can be alternately positioned in running and loading positions, and means for supporting the outermost end of one of said shaft end portions when it is located in run ning position.
2. A web roll supporting apparatus as described in claim 1, including means for locking the outermost end of one of said shaft end portions to the supporting means when in running position.
3. A web roll supporting apparatus as described in claim 1, including means for spacing simultaneously the roll supporting means on each shaft end portion is positions equal distance from the vertical axis about which the housing rotates.
4. A web roll supporting apparatus as described in claim 1, wherein said means for supporting web rolls for rotation include a pair of core plugs removably mounted about one shaft end portion, each core plug having a stationary mounting portion and a rotatable portion for supporting the web roll.
5. A web roll supporting apparatus comprising a housing mounted for rotation about a vertical axis, a shatt extending from said housing along a horizontal axis, means on said shaft for supporting a web roll for rotation relative to the shaft, and means for spacing the web roll supporting means at a desired distance from the vertical axis.
6. A stand for supporting a roll of flexible web material from which the web is unwound for processing operations comprising a housing mounted for rotation about a vertical axis, a shaft extending through said housing with opposite ends extending outwardly from opposite sides of the housing and having end portions threaded in opposite directions, a pair of sleeves fitted about the outwardly extending shaft ends and each sleeve being threadably connected to an end portion of the shaft for movement longitudinally of the shaft, a pair of core plugs for plugs removably attached to each sleeve with portions for supporting said roll for rotational movement about said sleeve, each of said sleeves being slidably connected to the housing in a manner as to prevent rotation relative thereto, and means for rotating said shaft within said housing causing the threadably connected sleeves to travel along said shaft.
7. A stand as described in claim 6, wherein each sleeve has a bracket on opposite sides of said housing, a rod projecting towards said housing from each bracket and said housing having holes drilled therein to slidably receive said projecting rods and lock said sleeves against rotation relative to the housing.
8. A stand as described in claim 6, including a support having a stationary jaw positioned to receive an outermost end of said shaft and a movable jaw adapted to clamp the outermost end of said shaft to the stationary jaw for holding the shaft in a roll unwinding position.
9. A stand as described in claim 6, wherein said means for rotating said shaft within said housing include a bevel gear keyed to said shaft, a bevel pinion gear in mesh with the bevel gear and fixed to an end of a vertical shaft, and means for turning said vertical shaft.
10. A plurality of stands as described in claim 6, each stand being aligned to discharge a web towards a common processing station and each stand being adjustable to position the web discharged therefrom in alignment with the web discharged from an other stand.
11. A method of mounting a mill roll on a converting machine comprising the steps of lifting the mill roll to a position where the mill roll core is in alignment with a projecting shaft, fitting the mill roll upon the projecting shaft in a loading position spaced from alignment with a line of web processing, and rotating said shaft in a horizontal plane to a running position where the mill roll is in alignment with the line of Web processing.
12. The method or" mounting a mill roll on a converting machine as described in claim 11, including supporting the projecting shaft at the distal end when the mill roll is in a running position.
13. The method of mounting a mill roll on a converting machine as described in claim 11, including spacing the mill roll on the shaft in the loading position with relationship to the running position so that upon rotation of the shaft in a horizontal plane to the running position, the mill roll will be properly aligned.
14. The method of supplying mill rolls to a converting machine which includes the steps of lifting a first mill roll to a position where the core is aligned with the distal end of a first projecting shaft, fitting the first mill roll upon the first projecting shaft in a loading position spaced from the running line of the converting machine, rotating the first small roll andshaft in a horizontal plane to a running position where the first mill roll is in alignment with the running line of the converting machine, and loading a second mill roll on a second projecting shaft in the loading position while the first mill roll is being unwound in the running position.
References Cited UNITED STATES PATENTS 8/1943 Kiefer 24279 5/ 1962 Fredericksson et a1. 24279 US. 01. XtR.
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|U.S. Classification||242/560, 242/564.5, 242/594.5, 242/598.3, 414/684|