METHOD AND APPARATUS FOR MAINTAINING A POSITION OF A CUTTING SURFACE OF A CUTTING APPARATUS

FIELD OF THE INVENTION

The present disclosure relates to methods and apparatuses for forming lines of weakness in rolled products, and more specifically, relates to apparatuses and methods for adjusting and maintaining a position of a cutting surface used to create lines of weakness for rolled products.

BACKGROUND OF THE INVENTION

Some articles and packages may include a strip of material that has a line of weakness having one or more perforations to aid in tearing the article or package. For example, articles may include wax paper, aluminum foil, disposable bags, and sanitary tissue products, such as toilet tissue, facial tissue, and paper towels manufactured in the form of a web. Sanitary tissue products include lines of weakness to permit tearing off discrete sheets, for example, as is well known in the art. Such products are commonly used in households, businesses, restaurants, shops, and the like.

A line of weakness may include a plurality of perforations extending across the width of the web. In some configurations, lines of weakness may be created in a substrate by advancing the substrate between two cutting surfaces. For example, some perforators may utilize a cutting surface in the form of a rotating blade that flexes against a relatively stationary blade or anvil during operation to cut perforations in the substrate. However, creating perforations in substrates having relatively long widths and advancing at relatively high speeds can present various challenges in cutting operations. For example, maintaining the stationary blade in a desired position relative the rotating blade is an important operational aspect to help ensure that perforations are cut in a desired manner. In some scenarios, the position of the stationary blade may be adjusted to a desired setting before and/or during the start of cutting operations. As cutting operations continue, the stationary blade and associated support components may become heated. In turn, heating of the stationary blade and support components may require additional positional adjustments of the stationary blade until the stationary blade and support components reach steady state operating temperatures. However, when cutting operations are halted for an extended period of time, cooling of the stationary blade and associated support components may cause the stationary blade to move to an undesired position relative the rotating blade. As such, restarting the cutting operations without renewed positional adjustments of the cooled stationary blade may cause the cutting process to operate with improper engagement between cutting surfaces. Improper positioning resulting from unintended movement of the stationary blade during cutting operations can lead to non-perforated areas and/or inconsistent quality in the perforation and/or additional wear on equipment. Thus, it may be important to have the ability to precisely place and hold cutting surfaces in relatively fixed positions, even including fixed bowed positions, in order to maintain a desired engagement between cutting surfaces during extended shutdown periods and during operation.

Consequently, it would be beneficial to provide a method and apparatus for maintaining the stationary cutting surface and/or associated support components at a relatively constant temperature in order to maintain the stationary cutting surface in a desired position during operation and during shutdown periods. It may be further beneficial to provide a method and apparatus for being able to adjust the disposition of a stationary cutting surface(s) and/or associated support component(s) using a plurality of heaters or heating elements to heat one or more cutting components, such as a stationary support member, as will be described in greater detail below.

SUMMARY OF THE INVENTION

In one form, a cutting apparatus comprises: a frame; a support member rotatably supported by the frame; a blade comprising a proximal end region and a distal end region, wherein the proximal end region is releasably connected with the support member and wherein the distal end region comprises a first cutting surface comprising a first distal edge; a roll positioned adjacent the support member, the roll adapted to rotate about an axis, the roll comprising a second cutting surface comprising a second distal edge, wherein the first distal edge overlaps the second distal edge by an overlap distance such that the second cutting surface intermittently contacts the first cutting surface as the roll rotates about the axis; and a heater connected with the support member.

In another form, a method for cutting a substrate comprises steps of: providing a support member connected with a frame; providing a blade comprising a proximal end region and a distal end region, wherein the proximal end region is releasably connected with the support member and wherein the distal end region comprises a first cutting surface comprising a first distal edge; providing a dampener member positioned between the support member and the blade; positioning a roll adjacent the support member, the roll adapted to rotate about an axis, the roll comprising a second cutting surface comprising a second distal edge, wherein the first distal edge overlaps the second distal edge by an overlap distance such that the second cutting surface intermittently contacts the first cutting surface as the roll rotates about the axis; rotating the roll; and heating the dampener member using a heater to change the overlap distance to within a range of values or to maintain the overlap distance within the range of values.

In yet another form, a method for cutting a substrate comprises steps of: providing a support member connected with a frame; providing a blade comprising a proximal end region and a distal end region, wherein the proximal end region is releasably connected with the support member and wherein the distal end region comprises a first cutting surface comprising a first distal edge; providing a dampener member positioned between the support member and the blade; positioning a roll adjacent the support member, the roll adapted to rotate about an axis, the roll comprising a second cutting surface comprising a second distal edge, wherein the first distal edge overlaps the second distal edge by an overlap distance such that the second cutting surface intermittently contacts the first cutting surface as the roll rotates about the axis; rotating the roll to heat the dampener member to a first temperature; stopping rotation of the roll; and applying heat to the dampener member to maintain the dampener member at a second temperature, wherein the second temperature is approximately equal to the first temperature.

In still another form, a method for cutting a substrate comprises steps of: providing a support member connected with a frame; providing a blade comprising a proximal end region and a distal end region, wherein the proximal end region is releasably connected with the support member and wherein the distal end region comprises a first cutting surface comprising a first distal edge; positioning a roll adjacent the support member, the roll adapted to rotate about an axis, the roll comprising a second cutting surface comprising a second distal edge, wherein the first distal edge overlaps the second distal edge by an overlap distance such that the second cutting surface intermittently contacts the first cutting surface as the roll rotates about the axis; rotating the roll; and support member, including a dampener member, using heat from a first and/or a second heater to change the overlap distance or to maintain the overlap distance within the range of values.

In yet another form, a cutting apparatus comprises: a frame; a support member rotatably supported by the frame; a blade comprising a proximal end region and a distal end region, wherein the proximal end region is releasably connected with the support member and wherein the distal end region comprises a first cutting surface comprising a first distal edge; a roll adapted to rotate about an axis, the roll positioned adjacent the support member, the roll comprising a second cutting surface, wherein the second cutting surface intermittently contacts the first cutting surface such that a perforation is formed in the web material as the roll rotates about the axis; and a heater connected with the support member.

In yet another form, a cutting apparatus comprises: a frame; a support member supported by the frame; a blade comprising a first cutting surface; a second cutting surface positioned adjacent the support member, wherein the second cutting surface intermittently contacts the first cutting surface such that a perforation is formed in the web material; and a heater capable of heating the support member.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an isometric view of a perforating apparatus.

FIG. 2 is an exploded assembly view of the perforating apparatus of FIG. 1.

FIG. 3 is a detailed view of a portion of a support member and a first cutting surface.

FIG. 4 is a detailed view of a portion of roll and a second cutting surface.

FIG. 5 is a detailed side view of a first cutting surface and a second surface.

FIG. 5A is a detailed side view of a blade, support member, and attachment assembly.

FIG. 5B is a view of the blade taken along the sectional line 5B-5B of FIG. 5A.

FIG. 5C is a detailed side view of a first cutting surface and a second surface.

FIG. 6 is left side view of a perforating apparatus.

FIG. 7 is a cross sectional side view of the perforating apparatus taken along the sectional line 7-7 of FIG. 6.

FIG. 8A is a schematic illustration of a holding device in a first configuration and a housing actuator moving a first cutting surface in a first direction or a second direction.

FIG. 8B is a schematic illustration of the holding device in a second configuration maintaining the first cutting surface in a fixed position.

FIG. 8C is a schematic illustration of a support member actuator rotating the support member to adjust a circumferential position of the first cutting surface.

FIG. 9A is a plan view illustrating a support member prior to bowing in a direction 406.

FIG. 9B is a plan view of the support member from FIG. 9A after bowing in a direction 406 from an initial position illustrated in FIG. 9A.

DETAILED DESCRIPTION OF THE INVENTION

“Fibrous structure” as used herein means a structure that comprises one or more fibrous elements. In one example, a fibrous structure according to the present disclosure means an association of fibrous elements that together form a structure capable of performing a function. A nonlimiting example of a fibrous structure of the present disclosure is an absorbent paper product, which may be a sanitary tissue product such as a paper towel, bath tissue, or other rolled, absorbent paper product.

Non-limiting examples of processes for making fibrous structures include known wet-laid papermaking processes, air-laid papermaking processes, and wet, solution, and dry filament spinning processes, for example meltblowing and spunbonding spinning processes, that are typically referred to as nonwoven processes. Such processes may comprise the steps of preparing a fiber composition in the form of a suspension in a medium, either wet, more specifically aqueous medium, or dry, more specifically gaseous, i.e. with air as medium. The aqueous medium used for wet-laid processes is oftentimes referred to as fiber slurry. The fibrous suspension is then used to deposit a plurality of fibers onto a forming wire or belt such that an embryonic fibrous structure is formed, after which drying and/or bonding the fibers together results in a fibrous structure. Further processing the fibrous structure may be carried out such that a finished fibrous structure is formed. For example, in typical papermaking processes, the finished fibrous structure is the fibrous structure that is wound on the reel at the end of papermaking and may subsequently be converted into a finished product (e.g., a sanitary tissue product).

“Fibrous element” as used herein means an elongate particulate having a length greatly exceeding its average diameter, i.e. a length to average diameter ratio of at least about 10. A fibrous element may be a filament or a fiber. In one example, the fibrous element is a single fibrous element rather than a yarn comprising a plurality of fibrous elements.

The fibrous elements of the present disclosure may be spun from polymer melt compositions via suitable spinning operations, such as meltblowing and/or spunbonding and/or they may be obtained from natural sources such as vegetative sources, for example trees.

The fibrous elements of the present disclosure may be monocomponent and/or multicomponent. For example, the fibrous elements may comprise bicomponent fibers and/or filaments. The bicomponent fibers and/or filaments may be in any form, such as side-by-side, core and sheath, islands-in-the-sea and the like.

“Filament” as used herein means an elongate particulate as described above that exhibits a length of greater than or equal to 5.08 cm (2 in.) and/or greater than or equal to 7.62 cm (3 in.) and/or greater than or equal to 10.16 cm (4 in.) and/or greater than or equal to 15.24 cm (6 in.).

Filaments are typically considered continuous or substantially continuous in nature. Filaments are relatively longer than fibers. Non-limiting examples of filaments include meltblown and/or spunbond filaments. Non-limiting examples of polymers that may be spun into filaments include natural polymers, such as starch, starch derivatives, cellulose, such as rayon and/or lyocell, and cellulose derivatives, hemicellulose, hemicellulose derivatives, and synthetic polymers including, but not limited to polyvinyl alcohol, thermoplastic polymer, such as polyesters, nylons, polyolefins such as polypropylene filaments, polyethylene filaments, and biodegradable thermoplastic fibers such as polylactic acid filaments, polyhydroxyalkanoate filaments, polyesteramide filaments and polycaprolactone filaments.

“Fiber” as used herein means an elongate particulate as described above that exhibits a length of less than 5.08 cm (2 in.) and/or less than 3.81 cm (1.5 in.) and/or less than 2.54 cm (1 in.). A fiber may be elongate physical structure having an apparent length greatly exceeding its apparent diameter (i.e., a length to diameter ratio of at least about 10.) Fibers having a non-circular cross-section and/or tubular shape are common; the “diameter” in this case may be considered to be the diameter of a circle having a cross-sectional area equal to the cross-sectional area of the fiber.

Fibers are typically considered discontinuous in nature. Non-limiting examples of fibers include pulp fibers, such as wood pulp fibers, and synthetic staple fibers such as polypropylene, polyethylene, polyester, copolymers thereof, rayon, glass fibers and polyvinyl alcohol fibers.

Staple fibers may be produced by spinning a filament tow and then cutting the tow into segments of less than 5.08 cm (2 in.) thus producing fibers.

In one example of the present disclosure, a fiber may be a naturally occurring fiber, which means it is obtained from a naturally occurring source, such as a vegetative source, for example a tree and/or other plant. Such fibers are typically used in papermaking and are oftentimes referred to as papermaking fibers. Papermaking fibers useful in the present disclosure include cellulosic fibers commonly known as wood pulp fibers. Applicable wood pulps include chemical pulps, such as Kraft, sulfite, and sulfate pulps, as well as mechanical pulps including, for example, groundwood, thermomechanical pulp and chemically modified thermomechanical pulp. Chemical pulps, however, may be preferred since they impart a superior tactile sense of softness to fibrous structures made therefrom. Pulps derived from both deciduous trees (hereinafter, also referred to as “hardwood”) and coniferous trees (hereinafter, also referred to as “softwood”) may be utilized. The hardwood and softwood fibers may be blended, or alternatively, may be deposited in layers to provide a stratified web. Also applicable to the present disclosure are fibers derived from recycled paper, which may contain any or all of the above categories of fibers as well as other non-fibrous polymers such as fillers, softening agents, wet and dry strength agents, and adhesives used to facilitate the original papermaking.

In addition to the various wood pulp fibers, other cellulosic fibers such as cotton linters, rayon, lyocell, and bagasse fibers may be used in the fibrous structures of the present disclosure.

“Sanitary tissue product” as used herein means one or more finished fibrous structures, that is useful as a wiping implement for post-urinary and post-bowel movement cleaning (e.g., toilet tissue, also referred to as bath tissue, and wet wipes), for otorhinolaryngological discharges (e.g., facial tissue), and multi-functional absorbent and cleaning and drying uses (e.g., paper towels, shop towels). The sanitary tissue products may be embossed or not embossed and creped or uncreped. In one example, sanitary tissue products rolled about a fibrous core of the present disclosure may have a basis weight between about 10 g/m2 to about 160 g/m2 or from about 20 g/m2 to about 150 g/m2 or from about 35 g/m2 to about 120 g/m2 or from about 55 to 100 g/m2, specifically reciting all 0.1 g/m2 increments within the recited ranges. In addition, the sanitary tissue products may have a basis weight between about 40 g/m2 to about 140 g/m2 and/or from about 50 g/m2 to about 120 g/m2 and/or from about 55 g/m2 to about 105 g/m2 and/or from about 60 to 100 g/m2, specifically reciting all 0.1 g/m2 increments within the recited ranges. Other basis weights for other materials, such as wrapping paper and aluminum foil, are also within the scope of the present disclosure.

“Basis Weight” as used herein is the weight per unit area of a sample reported in lbs/3000 ft2 or g/m2. Basis weight may be measured by preparing one or more samples to create a total area (i.e., flat, in the material's non-cylindrical form) of at least 100 in2 (accurate to +/−0.1 in2) and weighing the sample(s) on a top loading calibrated balance with a resolution of 0.001 g or smaller. The balance is protected from air drafts and other disturbances using a draft shield. Weights are recorded when the readings on the balance become constant. The total weight (lbs or g) is calculated and the total area of the samples (ft2 or m2) is measured. The basis weight in units of lbs/3,000 ft2 is calculated by dividing the total weight (lbs) by the total area of the samples (ft2) and multiplying by 3000. The basis weight in units of g/m2 is calculated by dividing the total weight (g) by the total area of the samples (m2).

“Density” as used herein is calculated as the quotient of the Basis Weight expressed in grams per square meter divided by the Caliper expressed in microns. The resulting Density is expressed as grams per cubic centimeter (g/cm3 or g/cc). Sanitary tissue products of the present disclosure may have a density of greater than about 0.05 g/cm3 and/or greater than 0.06 g/cm3 and/or greater than 0.07 g/cm3 and/or less than 0.10 g/cm3 and/or less than 0.09 g/cm3 and/or less than 0.08 g/cm3 and/or less than 0.60 g/cm3 and/or less than 0.30 g/cm3 and/or less than 0.20 g/cm3 and/or less than 0.15 g/cm3 and/or less than 0.10 g/cm3 and/or less than 0.07 g/cm3 and/or less than 0.05 g/cm3 and/or from about 0.01 g/cm3 to about 0.20 g/cm3 and/or from about 0.02 g/cm3 to about 0.15 g/cm3 and/or from about 0.02 g/cm3 to about 0.10 g/cm3.

“Ply” as used herein means an individual, integral fibrous structure.

“Plies” as used herein means two or more individual, integral fibrous structures disposed in a substantially contiguous, face-to-face relationship with one another, forming a multi-ply fibrous structure and/or multi-ply sanitary tissue product. It is also contemplated that an individual, integral fibrous structure may effectively form a multi-ply fibrous structure, for example, by being folded on itself.

“Rolled product(s)” as used herein include plastics, fibrous structures, paper, sanitary tissue products, paperboard, polymeric materials, aluminum foils, and/or films that are in the form of a substrate, also referred to herein as a “web,” and may be wound about a core. For example, the sanitary tissue product may be convolutedly wound upon itself about a core or without a core to form a sanitary tissue product roll or may be in the form of discrete sheets, as is commonly known for toilet tissue and paper towels.

“Machine Direction,” MD, as used herein is the direction of manufacture for a perforated substrate. The machine direction may be the direction in which a substrate is advanced through a perforating apparatus that may comprise a rotating roll and support member, as discussed below in one embodiment. The machine direction may be the direction in which a substrate travels while advancing between a blade and an anvil of a perforating apparatus.

“Cross Machine Direction” or “Cross Direction,” CD as used herein is the direction substantially perpendicular to the machine direction. The cross machine direction or cross direction may be substantially perpendicular to the direction in which a substrate is fed through a cylinder and lower support in one embodiment. The cross machine direction or cross direction may be the direction substantially perpendicular to the direction in which a substrate travels while advancing between a blade and an anvil. Aspects of the present disclosure relate to methods and apparatuses for forming lines of weakness in rolled products, and in particular, to apparatuses and methods for adjusting and maintaining a position of a cutting surface used to create lines of weakness for rolled products. As discussed below, a perforating apparatus may include a frame and a support member connected with the frame, and one or more blades may be connected with the support member. Each blade may comprise a proximal end region and a distal end region. The proximal end region may be releasably connected with the support member, and the distal end region comprises a first cutting surface comprising a first distal edge. To provide noise and vibration abatement, a dampener member may be positioned between the support member and the blade. A roll is positioned adjacent the support member and is adapted to rotate about an axis. The roll comprises a second cutting surface comprising a second distal edge, wherein the first distal edge overlaps the second distal edge by an overlap distance such that the second cutting surface intermittently contacts the first cutting surface as the roll rotates about the axis.

During cutting (as used herein, “cutting” includes “perforating”) operations, the intermittent contact between the first and second cutting surfaces causes the blade, the dampener member, and support member to become heated, which in turn, may cause the overlap distance to vary from a desired value and/or outside a desired range of values, necessitating positional adjustments of the first and/or second cutting surfaces. Conversely, when cutting operations are stopped, the blade, the dampener member, and the support member cool, which in turn, may cause the overlap distance to vary from a desired value and/or outside a desired range of values at steady state operating conditions, necessitating additional positional adjustments during restart of cutting operations. To help reduce or eliminate the changes to overlap distances caused by cyclical heating and cooling between times of cutting operations and shutdowns, a heater (which may also be referred to as a “heat source”, which may include heat sources such as heated fluids, electrical resistance, an induction heater, or radiant heat, etc.) may be positioned within the support member and/or adjacent the dampener member. As discussed below, the heater may operate to apply heat to the support member and/or dampener member to maintain the support member and/or dampener member at a relatively constant temperature during periods of cutting operations and/or during periods when cutting operations are stopped. In turn, the heater may operate to maintain the overlap distance at a desired value and/or within a desired range of values and/or change the overlap distance to a desired value and/or to within a desired range of values.

It is to be appreciated that various process and equipment configurations may be used to perforate a substrate 100. For example, FIG. 1 illustrates one example of an apparatus 200 for perforating substrates according to the present disclosure. In operation, the substrate 100 advances in a machine direction MD between a stationary first cutting surface 202 and a rotating second cutting surface 204 that creates a plurality of perforations 102 in the substrate 100. As such, the perforations 102 imparted to the substrate 100 forms a line of weakness 104. It is to be appreciated that the line of weakness 104 may be formed to extend in a straight line along the cross direction CD and/or may be formed to define an arcuate or non-linear line along the cross direction CD.

With reference to FIGS. 1 and 2, the perforating apparatus 200 may include a frame 206 that rotatably supports a housing 208, wherein the housing 208 is adapted to rotate about a first axis 210. The housing as shown in FIG. 2 may be configured as an assembly including a first part 208′ connected with a second part 208″, the first part 208′ including a tang 256 discussed in more detail below. The perforating apparatus 200 may also include a support member 212 having a first end portion 214 and an opposing second end portion 216, wherein the housing 208 rotatably supports the first end portion 214. The support member 212 may be adapted to rotate about a second axis 218. The support member 212 includes the first cutting surface 202. As shown in FIGS. 1 and 3, the support member 212 may include more than one first cutting surfaces 202 circumferentially spaced from each other about the second axis 218. As such, the support member 212 may be rotated about the second axis 218 to remove one first cutting surface 202 from service and place another first cutting surface 202 into service. In some configurations, the perforating apparatus 200 may include a support member actuator 220 having a first end portion 222 connected with the frame 206 and an opposing second end portion 224 connected with the support member 212. The support member actuator 220 may be adapted to selectively increase and decrease in length between the first end portion 222 and the second end portion 224, and thus, rotate the support member 212 about the second axis 218 to selectively adjust circumferential positions of the first cutting surfaces 202. Thus, the support member actuator 220 may be configured to hold the first cutting surface 202 in a stationary position about the second axis 218 during the perforating operation, and may be configured to rotate the support member 212 about the second axis 218 to adjust the circumferential position of the first cutting surface 202 when perforating operations have ceased. The support member 212 may further comprise one or more heaters 314 and/or 314′.

It is to be appreciated that the support member actuator 220 may be configured in various ways. For example, the support member actuator 220 may include a linear actuator comprising a rotary motor and a screw mechanism. The support member actuator 220 may also include a feedback device such as a rotary or linear encoder to transmit position data to a controller. It is to be appreciated that the support member actuator 220 may comprise various combinations of pneumatic, hydraulic, and/or electromechanical actuation means. In some arrangements, the support member actuator 220 may be configured to be manually operated, such as for example, a manually rotated jacking screw. In addition, as shown in FIG. 2, the apparatus 200 may include bearings 226 that rollingly connect the support member 212 with the housing 208, which may reduce the force required to rotate the support member 212 when adjusting the circumferential position of the first cutting surface 202.

With continued reference to FIGS. 1 and 2, the perforating apparatus 200 may also include a roll 228 rotatably supported by the frame 206. In addition, the apparatus 200 may include bearings 230 that rollingly connect the roll 228 with the frame 206. The roll 228 may be positioned adjacent the support member 212 and may be adapted to rotate about a third axis 232. A shown in FIG. 4, the roll 228 may include one or more second cutting surfaces 204 circumferentially spaced apart from each other around the third axis 232. As such, the second cutting surfaces 204 may be adapted to intermittently contact the first cutting surface 202 as the roll 228 rotates about the third axis 232 to create perforations 102 in advancing the substrates 100 to form lines of weakness 104. The perforating apparatuses 200 herein may be configured to produce rolled products having various qualities and characteristics, such as described for example, in U.S. Patent Publication Nos. 2019/0078265A1; 2019/0078263A1; 2019/0078266A1; 2019/0078267A1; and 2019/0078264A1, which are all incorporated by reference herein.

As discussed above with reference to FIG. 1, the substrate 100 advances between the first cutting surface 202 and the second cutting surface 204. The first cutting surface 202 and the second cutting surface 204 operate in contacting relationship to perforate the advancing substrate 100. It is to be appreciated that the first cutting surface 202 and the second cutting surface 204 may be configured in various ways. For example, as shown in FIGS. 3-5, the first cutting surface 202 may be configured as a blade 234 and the second cutting surface 206 may be configured as an anvil 236. During the perforating operation, the blade 234 may be held in a fixed position and the anvil 236 may rotate about the third axis 232. A nip 238 is defined where the anvil 236 contacts the blade 234. In some configurations, the second cutting surface 204 may be helically arranged on the roll 228.

With continued reference to FIG. 5C, the blade 234 may be positioned such that a distal edge 240 of the blade 234 overlaps a distal edge 242 of the anvil 236 by an overlap distance 244. The overlap distance 244 is measured from the distal edge 240 of the blade 234 to the distal edge 242 of the anvil 236 in a direction substantially parallel to the cross direction. By decreasing the overlap distance 244, the perforations 102 may generally become relatively less pronounced, less visible, shorter, and/or the unperforated regions may generally become wider and thus stronger. If the overlap distance 244 is too small, the blade 234 and anvil 236 may fail to operatively engage during operation, and the substrate 100 may not be adequately perforated. In turn, the resulting characteristics of the line of weakness 104 may be unacceptable from a manufacturing standpoint and/or from a consumer acceptance/use standpoint. By increasing the overlap distance 244, the perforations 102 may generally become relatively more pronounced, more visible, and longer. If the overlap distance 244 becomes too large, the substrate 100 may be unable to advance through the nip 238 and/or the substrate 100 may be separated such that the line of weakness 104 fails during processing. In turn, the substrate 100 may be split along the line of weakness 104 or adjacent to the line of weakness 104. In some configurations, the overlap distance 244 may be from about 0.001 inches to about 0.1 inches, specifically reciting all 0.001 inch increments within the above-recited range and all ranges formed therein or thereby. As discussed in more detail below, the overlap distance 244 may be adjusted by moving the blade 234 and support member 212.

It is to be appreciated that the support member 212 may be configured in various ways. For example, the support member 212 may be formed from metal, such as steel or a steel alloy, or from some other material as would be known to those skilled in the art to be suitable as a structural support of perforating equipment. The support member 212 may be formed in a block shape, a cylindrical shape, or another shape to support a blade. The support member 212 and blade 234 may be placed in a fixed, non-moveable, non-rotatable position during contacting relationship with the anvil 236. As previously described, the support member 212 may be rotated about the second axis 218 to remove a particular blade 234 from service and fixed in a position so that a replacement blade 234 may be placed in contacting relationship with the anvil 236. As discussed above, a support member actuator 220 may be used to selectively rotate the support member 212 and fix the rotational position of the support member 212 about the second axis 218.

As shown in FIG. 5A, the blade 234 may be connected with the support member 212 with an attachment assembly 300. The attachment assembly 300 and the support member 212 may hold the blade 234 in position such that a portion of the blade 234 extends outward from the support member 212 and is exposed for contact with the anvil 236. As such, the distal edge 240 of the blade 234 may be exposed such that the anvil 236 operatively engages the distal edge 240 of the blade 234. The blade 234 held on the support member 212 such that the blade 234 may deflect during operative engagement with the anvil 236, which may be referred to as a flex-rigid configuration. In some examples, the blade 234 interacts with the anvil 236 in a shearing action. The deflection and the inherent flexibility of the blade 234 may allow for relatively improved perforation reliability by being relatively more forgiving to slight differences in machine tolerances.

In other nonlimiting inventive examples, said components (e.g., the blade 234 and anvil 236) may be positioned in close proximity such that the web may be perforated or cut without actual contact between the components (e.g., the web may be pinched between said components such that one or more openings, or partial openings, are formed in the web). In such embodiments where there is not contact between the blade 234 and anvil 236, one or more heaters may be used to keep the desired proximity between the blade 234 and anvil 236 constant. Such embodiments described in this paragraph may be useful for further decreasing wear of the equipment.

It is to be appreciated that the blade 234 may be connected with the support member 212 in various ways. For example, FIG. 5A illustrates an attachment assembly 300 that may be configured to releasably connect with the blade 234 with the support member 212. The attachment assembly 300 may include a cartridge 302 and an insert member 304, wherein the cartridge 302 is positioned between the support member 212 and the insert member 304. In turn, the blade 234 may be positioned between the insert member 304 and a clamp member 306. A bolt 308 may extend through the clamp member 306 and the cartridge 302 and into the support member 212. In some configurations, the bolt 308 may be threadedly connected with the support member 212 to releasably connect the clamp member 306 and the cartridge 302 with the support member 212.

With continued reference to FIG. 5A, the attachment assembly 300 may include a shim member 310 positioned between a proximal end region 246 of the blade 234 and the insert member 304. Thus, as the bolt 308 is threaded into the support member 212, the clamp member 306 is pressed against the proximal end region 246 of the blade 234. As such, the proximal end region 246 is captured between the shim member 310 and the insert member 304 and cartridge 302 to connect the blade 234 with the support member 212. Thus, the blade 234 may be removed from the support member 212 by untightening the bolt 308 to release the proximal end region 246 from between the clamp member 306 and the insert member 304. From the proximal end region 246, the blade 234 extends to a distal end region 248 that comprises the first cutting surface 202 and the first distal edge 240 discussed above. The attachment assembly 300 may also include a dampener member 312 positioned between the insert member 304 and the blade 234. The dampener member 312 may be configured to help abate noise and vibration caused by the intermittent contact between the first and second cutting surfaces 202, 204 during cutting operations. It is to be appreciated that the dampener member 312 may be configured in various ways and may be made from various types of materials. For example, in some configurations, the dampener member 312 may comprise homogenous elastomeric materials and/or composite material that may, in some configurations, comprise polymer or natural fibers and a layer of elastomeric material.

As previously mentioned, intermittent contact between the first and second cutting surfaces 202, 204 resulting from rotation of the roll 228 during cutting operations causes the blade 234, components of the attachment assembly 300, and the support member 212 to be become heated. Such heating, in turn, may cause the blade 234, components of the attachment assembly 300, and/or the support member 212 to expand and/or deform from differential heating. Such expansion and/or deformation may cause the overlap distance 244 to vary from a desired value and/or vary outside a desired range of values. In contrast, when cutting operations are stopped, the blade 234, components of the attachment assembly 300, and the support member 212 cool, shrink, and/or otherwise change shape. Such cooling, in turn, may cause the overlap distance 244 deviate again from a desired value and/or vary outside a desired range of values set at steady state operating conditions. As previously mentioned, the apparatus 200 may include a heater 314 that may operate to maintain the blade 234, components of the attachment assembly 300, and/or the support member 212 at a relatively constant temperature during periods of cutting operations and/or during periods when cutting operations are stopped. As such, the heater 314 may operate to maintain the overlap distance 244 at a desired value or within a desired range of values during cutting operations and/or when cutting operations have stopped. The heater 314 may also operate to change the overlap distance 244 to a desired value and/or to within a desired range of values.

It is to be appreciated that heating and cooling of some components may result in relatively larger changes to the overlap distance 244 than changes caused by heating and cooling of other components. For example, in some configurations, heating and cooling of the dampener member 312 may contribute to relatively small changes to the overlap distances 244 as compared with corresponding heating and cooling of the support member 212, and other components of the attachment assembly 300. Heating and cooling the dampening member 312 may alter at least one physical property of the dampener member 312 to change the overlap distance or to maintain the overlap distance 244 within the range of values. Such physical properties may include any one of a modulus of elasticity, coefficient of thermal expansion, glass transition temperature, volume, and shape of the dampener member 312. Thus, the heater 314 may be positioned adjacent the dampener member 312. For example, as shown in FIG. 5A, the heater 314 may be positioned between the cartridge 302 and the insert member 304. Insulation 316 may also be provided between the heater 314 and the cartridge 302. As such, the heater 314 may operate to apply heat to the dampener member 312 conducted through the insert member 304.

It is also to be appreciated that the blade 234, support member 212, and attachment assembly 300 may be configured in various ways and may include various types of heater and dampener member configurations. For example, as mentioned above, the heater 314 may be positioned adjacent the dampener member 312. In some configurations, the heater 314 may be positioned in proximity to the dampener member 312 without directly contacting the dampener member 312. In some configurations, the heater 314 may be positioned in direct contact with the dampener member 312. In some configurations, the heater 314 may be positioned within or embedded within the dampener member 312. In some configurations, the heater 314 may also be configured as the dampener member 312. In some configurations, such as shown in FIGS. 5A and 5B, the heater 314 may be configured as a cable heater, such as for example, Model 125H126A4A-969, commercially available from Watlow Electric Manufacturing Co. The heater 316 may also be configured as a plurality of heating elements arranged along the cross directional length of the support member 212. In some configurations, the apparatus 200 may be configured to include heat transfer devices, such as heat pipes to help evenly distribute heat within various components of the apparatus. For example, one or more heat pipes may be connected with the support member 212 and/or the attachment assembly 300. Some examples of heat pipes are disclosed in U.S. Pat. No. 2,350,348, which is incorporated by reference.

The attachment assembly 300 and/or support member 212 may include a temperature detector 318, such as a thermocouple or RTD. For example, as shown in FIG. 5A, a temperature detector 318 may be embedded in the insert member 312. It is to be appreciated that temperature detectors 318 may be positioned within and/or adjacent to various other components of the attachment assembly 300 and/or the support member 212. In some configurations, the temperature detector 318 may be configured to provide a temperature feedback indication, such as to an operator display. And in some configurations, the temperature detector 318 may provide temperature feedback to a controller, which may in turn, automatically operate the heater 314 to maintain the temperature feedback at a desired setpoint.

One or more heaters 314, 314′ may be added to the support member 212 for the purpose of controlling the disposition of the cutting surface 204, such as the blade 234, such that the cutting surface 204 may be bowed or flexed as illustrated by FIGS. 9A and 9B. When a first heater 314 and a second heater 314′ are used together in the support member 212, the first heater 314 may have a first temperature (“T-1”) and the second heater 314′ may have a second temperature (“T-2”). T-1 may be from about 80° F. to about 120° F., from about from about 90° F. to about 110° F., or from about 95° F. to about 105° F., specifically reciting all 1 degree increments within the above-recited range and all ranges formed therein or thereby, such as 105° F. T-2 may be from about 80° F. to about 120° F., from about from about 90° F. to about 110° F., or from about 95° F. to about 105° F., specifically reciting all 1 degree increments within the above-recited range and all ranges formed therein or thereby, specifically reciting all 1 degree increments within the above-recited range and all ranges formed therein or thereby. T-1 may be about 1° F., about 2° F., about 5° F., about 10° F., about 15° F., about 20° F., or about 25° F. greater than T-2, specifically reciting all 1° F. increments within the above-recited range and all ranges formed therein or thereby, such as 100° F. As illustrated in FIGS. 9A and 9B, the two heaters 314 and 314′ may be placed oppositely (about 180 degrees) from each other, or about 90, about 45 degrees, or about 22.5 degrees from each other, specifically reciting all 1 degree increments within the above-recited range and all ranges formed therein or thereby. It is foreseen that there may also be an advantage to placing four heaters (not shown), each spaced about 90 degrees from each other in order to control bowing or flexing in both the horizontal and vertical directions and to compensate for any sagging that occurs due to the support member's (i.e., roll's) own weight. Further, depending on the size of the roll, as well as the size of the heaters and the number of cutting positions around the support member, it may be desirable to place 6, 8, 10, or 12 heaters around the support member (not shown). When multiple heaters are disposed in a unit, certain heaters may be active, while certain other heaters are kept inactive.

As illustrated in FIG. 9B, as heat 404 comes from the friction of the process and/or as the heater(s) 314, 314′ is utilized, initial surface position 400′ may be bowed or flexed 406 to become 400 and initial surface position 402′ may become 402. The heater(s) 314, 314′ may be utilized to precisely control the amount of bowing or flexing 406. In some instances, heater 314 may not be utilized during a process runtime if the process results in the support member 212 reaching a certain temperature; in such a case, the heater 314 may not be utilized until the process slows down or is paused. In some cases, heater 314 and heater 314′ may be “on” at the same time, but may intermittently be “on” such that their “on” time overlaps only in-part, or such that their “on” time is completely staggered. “On” time of the heater(s) may be determined by temperature (via a temperature control system) of certain areas of the support member and/or may be determined by deformation (bowing or flexing, measured, for example, by laser(s)) of a portion of a surface of the support member. “On” time of a heater may most simply be controlled by the status of the process; if the cutting or perforating process is running, the heater(s) may be “off” and if the cutting or perforating process is not running (instantly or after a period of time) the heater(s) may turn “on.”

Further, the heater 314 may be disposed to operate such that it applies heat to the dampener member 312 to maintain the dampener member 312 at a relatively constant temperature during periods of cutting operations and/or during periods when cutting operations are stopped.

Ultimately, the one or more heaters 314, 314′ may operate to maintain the overlap distance 244 at a desired value or within a desired range of values and/or change the overlap distance to a desired value or to within a desired range of values. In some configurations, a desired range of values of the overlap distance 244 may be from about 0.001 inches to about 0.009 inches, specifically reciting all 0.001 inch increments within the above-recited range and all ranges formed therein or thereby. It is to be appreciated that a support member 212 may include more than one blade configurations. In some configurations, such as shown in FIG. 5B, the distal edge 240 of the blade 234 may be defined by a plurality of blades 234, also referred to herein as teeth 250, separated from each other by notches 252 to define a discontinuous distal edge 240. For example, each notch 252 may separate a first tooth 250 from a second tooth 250. The blade 234 may be made from metal such as steel, tungsten carbide, ceramic or any other hardened material that may withstand engagement with the anvil 236. The blade 234 may include a number of teeth 250 extending along a total blade length. The spacing and number of teeth 250 may be determined based on the desired number of perforations 102 and characteristics of the line of weakness 104 in the substrate 100, such as disclosed in U.S. Patent Publication Nos. 2014/0366695A1; 2014/0366702A1; and 2014/0370224A1. The teeth 250 may be equally spaced along the total blade length or the teeth 250 may be spaced at various increments along the total blade length. In some configurations, the distal edge 240 of the blade 234 may not include notches 252 and teeth 250 and may be configured as a blade 234 with a single distal edge 240 extending contiguously in the cross direction CD.

It is to be appreciated that the roll 228 and anvil 236 may be configured in various ways. For example, the anvil 236 may be made from the same material or different material as the roll 228. The anvil 236 may be made from a material that provides sufficient rigidity and life, strength and wear resistance, such that the anvil 236 does not deflect or deflects minimally when engaging the blade 234 and can sustain relatively prolonged manufacturing run time. The anvil 236 may be made from metal such as steel, aluminum, or tungsten carbide. The anvil 236 may also be made from non-metal such as ceramic, carbon fiber, or hard plastic. It is also to be appreciated that the anvil 236 may be made from two or more different materials. In some configurations, the anvil 236 may extend in the cross direction CD along a straight line in the cross direction CD. In some configurations, the anvil 236 may include curved portions extending along the cross direction CD.

Although the first cutting surface 202 is described above in the form of a blade 234 and the second cutting surface 204 is described above in the form of an anvil 236, it is to be appreciated that the perforating apparatus may be configured various ways, such as disclosed for example, in U.S. Patent Publication Nos. 2014/0366695A1; 2014/0366702A1; 2014/0370224A1; 2016/0271820A1; 2016/0271823A1; 2016/0271824A1; 2019/0077038A1; 2019/0077039A1; 2019/0078265A1; 2019/0078263A1; 2019/0078266A1; 2019/0078267A1; and 2019/0078264A1, all of which are incorporated by reference herein. In some configurations, the first cutting surface 202 may be configured as an anvil 236 and the second cutting surface 204 may be configured as a blade 234. In some configurations, the first cutting surface 202 and the second cutting surface 204 may both be configured as blades 234. In some configurations, the blade 234 may be configured with a continuous distal surface and the anvil may configured with a plurality of anvil surfaces, also referred to herein as teeth, separated from each other by notches to define a discontinuous distal edge. The perforating apparatus may also be configured such that the blade 234 may oscillate in the cross direction CD during the perforation process. For example, the blade 234 may oscillate by moving a first direction, substantially parallel to the cross direction CD, by a predetermined amount and, subsequently, moving in a second direction, opposite the first direction by another predetermined amount. The blade 234 may oscillate by the same distance in both the first direction and the second direction, or the blade may oscillate by a different distance in the first direction and the second direction. The oscillation of the blade 234 may aid in reducing wear on the blade during processing and may allow for the blade to wear more uniformly than if the blade remained stationary. Examples of oscillating blades are disclosed in U.S. Patent Publication Nos. 2016/0271820A1; 2016/0271823A1; and 2016/0271824A1.

It is also to be appreciated that the apparatus 200 may be configured with various types of adjustment apparatuses that may allow a user to adjust the position of a stationary blade relative to a rotating cutting surface. In some configurations, an adjustment apparatus may include an eccentric housing that supports a stationary blade. With such a configuration, the cutting surface of the stationary blade may be moved toward and away from an opposing cutting surface by rotating the eccentric housing. For example, the apparatus 200 may include various types of adjustment mechanisms such as discussed in more detail below and such as disclosed in U.S. patent application Ser. No. 16/156,023, which is incorporated by reference herein.

As previously mentioned, the perforating apparatus 200 may be adapted to allow a user to selectively move the first cutting surface 202 to adjust engagement between the first cutting surface 202 and the second cutting surface 204. As shown in FIGS. 6 and 7, the second axis 218 about which the support member 212 may rotate is offset from the first axis 210 about which the housing 208 may rotate. As such, when the housing 208 is rotated in a first direction, the first cutting surface 202 may move away from the first axis 210 and/or toward the third axis 232. In addition, when the housing 208 rotates in a second direction opposite the first direction, the first cutting surface 202 may move toward the first axis 210 and/or away from the third axis 232. As shown in FIGS. 2 and 7, the apparatus 200 may also include bearings 254 that rollingly connect the housing 208 with the frame 206, which may reduce the force needed to rotate the housing 208 when adjusting the positions of the first cutting surface 202 and may provide for a precise center of rotation of the housing 208 about the first axis 210. It is also to be appreciated that the first axis 210 and the second axis 218 may or may not be parallel.

It is to be appreciated that the perforating apparatus 200 may be configured in various ways to allow the housing 208 to be rotated about the first axis 210. For example, as shown in FIGS. 2 and 6, the housing 208 may include a tang 256 connected with a housing actuator 258. The housing actuator 258 may include a first end portion 260 connected with the frame 206 and an opposing second end portion 262 connected with the tang 256 and may be adapted to selectively increase and decrease in length between the first end portion 260 and the second end portion 262. As such, the housing actuator 258 may be adapted to push against or pull on the tang 256 to rotate the housing 208 about the first axis 210, which in turn, causes the first cutting surface 202 to move toward or away from the roll 228. The housing actuator 258 may be configured in various ways, such as for example, a linear actuator, a hydraulic actuator, a pneumatic actuator, or a threaded rod. In some configurations, the housing actuator 258 may comprise a gear tooth surface, wherein gear teeth may interact with a pinion gear. As such, the pinion gear may be actuated to rotate the housing 208. In some configurations, the gear teeth may interact with a gear tooth rack which may be actuated in a linear motion to rotate the housing 208. In still another configuration the housing 208 may be directly connected with a motor or connected with a motor through a transmission, such as gears and/or belts.

As previously mentioned, the perforating apparatus 200 may be configured to separate the function of adjusting the position of the first cutting surface 202 from the function of holding the first cutting surface 202 in a fixed position. Thus, the perforating apparatus 200 may also be adapted to selectively hold the first cutting surface 202 in a fixed position after the first cutting surface 202 has been adjusted to a particular position. For example, as shown in FIGS. 2 and 7, the perforating apparatus 200 may include a holding device 264 connected with the frame 206. The holding device 264 may be selectively operable in a first configuration and a second configuration. For example, when the holding device 264 is placed in the first configuration, the holding device 264 may permit the housing 208 to rotate about the first axis 210 to selectively move the first cutting surface 202 toward and away from and the first axis 210 and/or the third axis 232, which in turn, adjusts the engagement between the first cutting surface 202 and the second cutting surface 204. When the holding device 264 is placed in the second configuration, the holding device 264 fixedly connects the housing 208 with the frame 206, and thus, prevents the housing 208 from being rotated about the first axis 210. With the housing 208 held in a fixed rotational position about the first axis 210, the first cutting surface 202 is maintained at a fixed distance between and the first axis 210 and/or the third axis 232, which in turn, maintains the engagement between the first cutting surface 202 and the second cutting surface 204 during operation.

It is to be appreciated that the holding device 264 may be configured in various ways. For example, as shown in FIGS. 2 and 7, the holding device 264 may be configured as a clamp 266. The clamp 266 may include a shell 268 fixedly connected with the frame 206 and may include a clamping surface 270 movably connected with the shell 268. The clamping surface 270 may be adapted to selectively engage and disengage from a corresponding surface 272 of the housing. For example, the clamping surface 270 may be selectively movable radially inward toward the first axis 210 and radially outward from the first axis 210. As such, when in the first configuration, the clamping surface 270 may be moved radially outward from the first axis 210 to disengage from the housing 208. With the clamping surface 270 disengaged from housing 208, the housing 208 may be rotated about the first axis 210 with the housing actuator 258 to adjust the position of the first cutting surface 202. When in the second configurations, the clamping surface 270 may be moved radially inward toward the first axis 210 and engage the surface 272 of the housing 208. With the clamping surface 270 engaged with housing 208, the clamp 266 fixedly connects the housing 208 with the frame 206. Thus, the housing 208 may be prevented from being rotated about the first axis 210, and in turn, the first cutting surface 202 is held in a fixed position.

In some configurations, the clamp 266 may be configured as a circular clamp adapted to prevent rotational movement, such as for example, a Rotoclamp available from HEMA Maschinen-und Apparateschutz GmbH. In some configurations, the housing 208 may comprise a series of surfaces substantially perpendicular to the first axis, such as a disk surface. The clamping surface may actuate and move substantially perpendicular to the disk surface, similar to a disk brake. It is to be appreciated that various forms of clamping technology may be applied to clamp the housing. In some configurations, the clamping forces may be applied by pneumatic, hydraulic, and/or mechanical means, such as springs. The clamping forces may utilize friction forces between the housing and clamping surface to hold the housing in a fixed position. In some configurations, the housing and clamping surfaces may be adapted for mechanical engagement, such as ridges or gear teeth. In some configurations, the clamp may be connected with the housing and may be operated between a first and second configuration to selectively move the clamping surface to engage and disengage with a surface of the frame.

It should be appreciated that the apparatus may be configured such that the clamp may not directly interact with the housing. For example, as previously described, the housing may comprise a gear tooth surface wherein a pinon gear or gear tooth rack may interface with the gear tooth surface. In such a configuration, the clamping mechanism may be adapted to interact with the pinion gear or gear tooth rack instead of directly interacting with the housing. In yet another example, the clamp may interact with a portion of the actuator such as with a rod lock mechanism.

As discussed above and as illustrated in FIGS. 8A-8C, the perforating apparatus 200 may be configured such that the function of adjusting the position of the first cutting surface 202 is separate from the function of holding the first cutting surface 202 in a fixed position. For example, as shown in FIG. 8A, the holding device 264 may be placed the first configuration, wherein the holding device 264 disengages from the housing 208. For example, as discussed above, the clamping surface 270 discussed above may be moved radially outward from the first axis 210 to disengage from the housing 208. As such, the housing 208 is permitted to be rotated about the first axis 210 to adjust the position of the first cutting surface 202. For example, the housing actuator 258 may be operated to move the tang 256 in a first direction 274, which in turn rotates the housing in a first rotational direction 276. Because the first axis 210 is offset from the second axis 218, rotation of the housing 208 in the first rotational direction 276 causes the support member 212 and first cutting surface 202 to move in direction A. As shown in FIG. 8A, the first cutting surface 202 may move away from the first axis 210 and toward the third axis 232 when the housing 208 is rotated in the first rotational direction 276. In some configurations, moving the first cutting surface 202 in direction A away from the first axis 210 and/or toward the third axis 232 may increase the overlap distance 244 discussed above with reference to FIG. 5.

With continued reference to FIG. 8A, the housing actuator 258 may be operated to move the tang 256 in a second direction 278, which in turn rotates the housing 208 in a second rotational direction 280. Because the first axis 210 is offset from the second axis 218, rotation of the housing 208 in the second rotational direction 280 causes the support member 212 and first cutting surface 202 to move in direction B. As shown in FIG. 8A, the first cutting surface 202 may move toward the first axis 210 and away from the third axis 232 when the housing 208 is rotated in the second rotational direction 280. In some configurations, moving the first cutting surface 202 in direction B toward the first axis 210 and/or away from the third axis 232 may decrease the overlap distance 244 discussed above with reference to FIG. 5.

Referring now to FIG. 8B, once the first cutting surface 202 is placed in a particular position relative the first axis 210 and/or third axis 232, and/or the overlap distance 244 is set to a particular length, the holding device 264 may be placed in the second configuration, wherein the holding device 264 engages from the housing 208. For example, as discussed above, the clamping surface 270 may be moved radially inward toward the first axis 210 and engage the surface 272 of the housing 208 with forces F (schematically represented in FIG. 8B with dashed arrows), thus fixedly connecting the housing 208 with the frame 206. As such, the housing 208 is prevented from being rotated about the first axis 210. In turn, the first cutting surface 202 may be held in a fixed position relative to the first axis 210 and the third axis 232. And in some configurations, the overlap distance 244 discussed above with reference to FIG. 5 may be held at a fixed length.

As discussed above and as schematically represented in FIG. 8C, the perforating apparatus 200 may also include a support member actuator 220 adapted to rotate the support member 212 about the second axis 218 to selectively adjust circumferential positions of the first cutting surfaces 202. The support member actuator 220 may be configured to hold the first cutting surface 202 in a stationary circumferential position relative the second axis 218, and may be configured to rotate the support member 212 about the second axis 218 to adjust the circumferential position of the first cutting surface 202 relative the second axis 218. For example, the support member actuator 220 may be operated to move the second end portion 224 connected with the support member 212 in a first direction 284, which in turn rotates the support member 212 and causes the first cutting surface 202 to move in direction C. In another example, the support member actuator 220 may be operated to move the second end portion 224 connected with the support member 212 in a second direction 286, which in turn rotates the support member 212 and causes the first cutting surface 202 to move in direction D.

It is to be also be appreciated that the perforating apparatus 200 may be configured in various ways to adjust and maintain the position of the first cutting surface. For example, as shown in FIGS. 1 and 7, the perforating apparatus may include a second housing 208′, a second housing actuator 258′ adapted to rotate about a fourth axis 282 offset from the second axis 218, and/or a second holding device 264′ operatively associated with the second end portion 216 of the support member 212. Such second housing 208′, second housing actuator 258′, and/or second holding device 264′ may also be arranged and/or operate in a relationship that mirrors the housing 208, housing actuator 258, and holding mechanism 264 described above with reference to the first end portion 214 of support member 212. In some configurations, housings and holding mechanisms arranged at opposing end portions of the support member 212 may be operated simultaneously with each other or independent of each other when adjusting the position the first cutting surface 202 to help ensure uniform engagement across the width of the perforating apparatus 200.

It is also to be appreciated that the perforating apparatus 200 may be configured with housings, actuators, and holding devices as described herein that may be operatively connected with the roll 236 and frame 206 and adapted to selectively adjust the positions of second cutting surface 204 of the roll 236.

The dimensions and values disclosed herein are not to be understood as being strictly limited to the exact numerical values recited. Instead, unless otherwise specified, each such dimension is intended to mean both the recited value and a functionally equivalent range surrounding that value. For example, a dimension disclosed as “40 mm” is intended to mean “about 40 mm.”

Every document cited herein, including any cross referenced or related patent or application and any patent application or patent to which this application claims priority or benefit thereof, is hereby incorporated herein by reference in its entirety unless expressly excluded or otherwise limited. The citation of any document is not an admission that it is prior art with respect to any invention disclosed or claimed herein or that it alone, or in any combination with any other reference or references, teaches, suggests or discloses any such invention. Further, to the extent that any meaning or definition of a term in this document conflicts with any meaning or definition of the same term in a document incorporated by reference, the meaning or definition assigned to that term in this document shall govern.

While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.

METHOD AND APPARATUS FOR MAINTAINING A POSITION OF A CUTTING SURFACE OF A CUTTING APPARATUS

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