CONVERTING MACHINE WITH FOLD SENSING MECHANISM

BACKGROUND
1. Technical Field

Exemplary embodiments of the disclosure relate to systems, methods, and devices for converting sheet materials. More specifically, exemplary embodiments relate to a converting machine for converting paperboard, corrugated board, cardboard, and similar sheet materials into templates for boxes and other packaging.

2. The Relevant Technology

Shipping and packaging industries frequently use paperboard and other sheet material processing equipment that converts sheet materials into box templates. One advantage of such equipment is that a shipper may prepare boxes of required sizes as needed in lieu of keeping on hand a stock of standard, pre-made boxes of various sizes. Consequently, the shipper can eliminate the need to forecast its requirements for particular box sizes as well as to store pre-made boxes of standard sizes. Instead, the shipper may store one or more bales of fanfold material, which can be used to generate a variety of box sizes based on the specific box size requirements at the time of each shipment. This allows the shipper to reduce storage space normally required for periodically used shipping supplies as well as reduce the waste and costs associated with the inherently inaccurate process of forecasting box size requirements, as the items shipped and their respective dimensions vary from time to time.

In addition to reducing the inefficiencies associated with storing pre-made boxes of numerous sizes, creating custom sized boxes also reduces packaging and shipping costs. In the fulfillment industry it is estimated that shipped items are typically packaged in boxes that are about 65% larger than the shipped items. Boxes that are too large for a particular item are more expensive than a box that is custom sized for the item due to the cost of the excess material used to make the larger box. When an item is packaged in an oversized box, filling material (e.g., Styrofoam, foam peanuts, paper, air pillows, etc.) is often placed in the box to prevent the item from moving inside the box and to prevent the box from caving in when pressure is applied (e.g., when boxes are taped closed or stacked). These filling materials further increase the cost associated with packing an item in an oversized box.

Customized sized boxes also reduce the shipping costs associated with shipping items compared to shipping the items in oversized boxes. A shipping vehicle filled with boxes that are 65% larger than the packaged items is much less cost efficient to operate than a shipping vehicle filled with boxes that are custom sized to fit the packaged items. In other words, a shipping vehicle filled with custom sized packages can carry a significantly larger number of packages, which can reduce the number of shipping vehicles required to ship the same number of items. Accordingly, in addition or as an alternative to calculating shipping prices based on the weight of a package, shipping prices are often affected by the size of the shipped package. Thus, reducing the size of an item's package can reduce the price of shipping the item. Even when shipping prices are not calculated based on the size of the packages (e.g., only on the weight of the packages), using custom sized packages can reduce the shipping costs because the smaller, custom sized packages will weigh less than oversized packages due to using less packaging and filling material.

Although sheet material processing machines and related equipment can potentially alleviate the inconveniences associated with stocking standard sized shipping supplies and reduce the amount of space required for storing such shipping supplies, previously available machines and associated equipment have various drawbacks. Some of the drawbacks result from using fanfold sheet material to create box or packaging templates. Fanfold sheet material is sheet material (e.g., paperboard, corrugated board, cardboard) that has been folded back and forth on itself such that the material is stacked into layers. A crease or fold (also referred to herein as a “fanfold crease”) is formed in the material between each layer to allow the material to be stacked in layers. When the material is unfolded so that it can be converted into box templates or other packaging, the fanfold creases may pose some difficulties in forming the box templates or packaging. For instance, the fanfold creases may cause the sheet material to fold or otherwise not lie flat, which can cause the sheet material to jam a converting machine that is being used to convert the sheet material to a box template or other packaging.

The fanfold creases may also pose some challenges to forming the box templates into strong, structurally sound boxes. For instance, if a box template is formed with a fanfold crease extending through a glue tab of the box template (or a portion of the template to which the glue tab is to be glued), the fanfold crease may cause the glue tab to curl or fold, making it difficult to securely attach the glue tab to another portion of the box template. Similarly, fanfold creases in other areas of a box template (e.g., in the flaps, panels, etc.) can also make it more difficult to erect a box from the box template or make the erected box less structurally sound.

Accordingly, there remains room for improvement in the area of sheet material processing machines.

BRIEF SUMMARY

Exemplary embodiments of the disclosure relate to systems, methods, and devices for converting sheet materials into boxes. More specifically, exemplary embodiments relate to box forming machines that convert paperboard, corrugated board, cardboard, and similar sheet materials into box templates and fold and glue the box templates to form un-erected boxes.

For instance, one embodiment is directed to a converting machine used to convert sheet material into packaging templates for assembly into boxes or other packaging. The converting machine includes a converting assembly configured to perform one or more transverse conversion functions and one or more longitudinal conversion functions on the sheet material as the sheet material moves through the converting machine in a feed direction. The one or more transverse conversion functions and the one or more longitudinal conversion functions may be selected from the group consisting of creasing, bending, folding, perforating, cutting, and scoring, to create the packaging templates. A fanfold crease sensing mechanism is configured to detect the presence and location of fanfold creases in the sheet material. The fanfold crease sensing mechanism includes a first sensor and a second sensor that are offset from one another in the feed direction. Additionally or alternatively, a first sensor is positioned above the sheet material and a second sensor is positioned below the sheet material.

According to another embodiment, a method of converting sheet material into packaging templates for assembly into boxes or other packaging is provided. The method includes detecting with a plurality of offset sensors the presence and location of a fanfold crease in the sheet material. A determination is made that the fanfold crease is within a predetermined or user configurable distance of a leading edge of the sheet material. A predetermined or user configurable length is cut off from a leading end of the sheet material to remove the fanfold crease and one or more conversion functions are performed on the remaining sheet material to form the packaging template.

In still another embodiment, a method of converting sheet material into packaging templates for assembly into boxes or other packaging includes detecting with a plurality of offset sensors the presence and location of a fanfold crease in the sheet material and predicting the location of a subsequent fanfold crease in the sheet material. The method also includes determining that the subsequent fanfold crease would be within a predetermined distance of a trailing edge of a packaging template formed from the sheet material and cutting off a predetermined length from a leading end of the sheet material to move the subsequent fanfold crease further from the trailing edge than the predetermined distance. One or more conversion functions are also performed on remaining sheet material to form the packaging template.

These and other objects and features of the present disclosure will become more fully apparent from the following description and appended claims, or may be learned by the practice of the disclosure as set forth hereinafter.

BRIEF DESCRIPTION OF THE DRAWINGS

To further clarify the above and other advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It is appreciated that these drawings depict only illustrated embodiments of the invention and are therefore not to be considered limiting of its scope. The invention will be described and explained with additional specificity and detail through the use of the accompanying drawings in which:

FIG. 1 illustrates a perspective view of an exemplary embodiment of a system for creating packaging templates;

FIG. 2 illustrates a rear perspective view of the converting machine from the system illustrated in FIG. 1;

FIG. 3 is a perspective view of a converting cartridge from the converting machine of FIGS. 1 and 2;

FIG. 4 is a cross-section side view of the converting cartridge of FIG. 3;

FIGS. 5 and 6 are side and front perspective views of a fanfold crease sensing mechanism for use with the converting cartridge of FIG. 3; and

FIGS. 7-9 illustrate a schematic of a fanfold sensing mechanism detecting the presence and location of a fanfold crease in sheet material.

DETAILED DESCRIPTION

The embodiments described herein generally relate to systems, methods, and devices for processing sheet materials and converting the same into packaging templates. More specifically, the described embodiments relate to a converting machine for converting sheet materials (e.g., paperboard, corrugated board, cardboard) into templates for boxes and other packaging.

While the present disclosure will describe details of embodiments with reference to specific configurations, the descriptions are illustrative and are not to be construed as limiting the scope of the present invention. Various modifications can be made to the illustrated configurations without departing from the spirit and scope of the invention as defined by the claims. For better understanding, like components have been designated by like reference numbers throughout the various accompanying figures.

As used herein, the term “bale” shall refer to a stock of sheet material that is generally rigid in at least one direction, and may be used to make a box or packaging template. For example, the bale may be formed of a continuous sheet of material or a sheet of material of any specific length, such as corrugated cardboard and paperboard sheet materials.

As used herein, the terms “box template” and “packaging template” shall refer to a substantially flat stock of material that can be folded into a box-like shape. A box or packaging template may have notches, cutouts, divides, and/or creases that allow the box or packaging template to be bent and/or folded into a box. Additionally, a box or packaging template may be made of any suitable material, generally known to those skilled in the art. For example, cardboard or corrugated paperboard may be used as the template material. A suitable material also may have any thickness and weight that would permit it to be bent and/or folded into a box-like shape.

As used herein, the term “crease” shall refer to a line along which the sheet material or box template may fold. For example, a crease may be an indentation in the sheet material. In the case of fanfold creases, the indentation may be made by folding the sheet material into layered stacks in a bale. Other creases may be formed in the sheet material to aid in folding portions of the sheet material separated by the crease, with respect to one another, to form a box.

The terms “notch,” “cutout,” and “cut” are used interchangeably herein and shall refer to a shape created by removing material from the template or by separating portions of the template, such that a divide through the template is created.

FIG. 1 illustrates a perspective view of a system 100 that may be used to create packaging templates. System 100 includes one or more bales 102 of sheet material 104. System 100 also includes a converting machine 106 that performs one or more conversion functions on sheet material 104, as described in further detail below, in order to create packaging templates 108. Excess or waste sheet material 104 produced during the conversion process may be collected in a collection bin 110. After being produced, packaging templates 108 may be formed into packaging containers, such as boxes.

With continued reference to FIG. 1, attention is also directed to FIG. 2, which generally illustrate various aspects of converting machine 106 is greater detail. As illustrated in FIGS. 1 and 2, converting machine 106 includes a support structure 112 and a converting assembly 114 mounted on support structure 112.

As shown in FIG. 1, bales 102 may be disposed proximate to the backside of converting machine 106, and sheet material 104 may be fed into converting assembly 114. Sheet material 104 may be arranged in bales 102 in multiple stacked layers. The layers of sheet material 104 in each bale 102 may have generally equal lengths and widths and may be folded one on top of the other in alternating directions.

As best seen in FIG. 2, converting machine 106 may also have one or more infeed guides 124. Each infeed guide 124 may include a lower infeed wheel 126 and an upper infeed wheel 128. In some embodiments, lower infeed wheels 126 or upper infeed wheels 128 may be omitted. Each set of lower and upper infeed wheels 126, 128 are designed and arranged to guide sheet material 104 into converting assembly 114 while creating few if any bends, folds, or creases in sheet material 104. For instance, lower and upper infeed wheels 126, 128 may rotate to facilitate smooth movement of sheet material 104 into converting assembly 114. Additionally, lower infeed wheels 126 and/or upper infeed wheels 128 may be at least somewhat deformable so as to limit or prevent the formation of bends, folds, or creases in sheet material 104 as it is fed into converting assembly 114.

As sheet material 104 is fed through converting assembly 114, converting assembly 114 may perform one or more conversion functions (e.g., crease, bend, fold, perforate, cut, score) on sheet material 104 in order to create packaging templates 108. Converting assembly 114 may include therein a converting cartridge that feeds sheet material 104 through converting assembly 114 and performs the conversion functions thereon.

FIGS. 3 and 4 illustrate an example converting cartridge 130 separate from the rest of converting assembly 114 and converting machine 106. As can be seen in FIGS. 3 and 4, converting cartridge 130 includes a guide channel 132. Guide channel 132 may be configured to flatten sheet material 104 so as to feed a substantially flat sheet thereof through converting assembly 114. As shown, for instance, guide channel 132 includes opposing upper and lower guide plates 132a, 132b that are spaced apart sufficiently to allow sheet material 104 to pass therebetween, but also sufficiently close enough together to flatten sheet material 104. In some embodiments, as shown in FIG. 4, the upper and lower guide plates 132a, 132b may be flared or spaced further apart at on opening end to facilitate insertion of sheet material 104 therebetween.

In the illustrated embodiment, converting cartridge 130 includes a single guide channel 132 that guides lengths of sheet material 104 through converting assembly 114. It will be understood, however, that converting cartridge 130 may include multiple guide channels for feeding one or multiple lengths of sheet material 104 (e.g., from multiple bales 102) through converting assembly 114. When multiple guide channels are included, the guide channels may be horizontally and/or vertically offset from one another.

As also illustrated in FIGS. 3 and 4, converting cartridge 130 also includes at least one feed roller 134 that pulls sheet material 104 into converting assembly 114 and advances sheet material 104 therethrough. Feed roller(s) 134 may be configured to pull sheet material 104 with limited or no slip and may be smooth, textured, dimpled, and/or teethed. Each feed roller 134 may be actively rolled by an actuator or motor in order to advance sheet material 104 through converting assembly 114.

As best seen in FIG. 4, converting cartridge 130 includes one or more converting tools, such as a crosshead 150 and longheads 152, that perform the conversion functions (e.g., crease, bend, fold, perforate, cut, score) on sheet material 104 in order to create packaging templates 108. Some of the conversion functions may be made on sheet material 104 in a direction substantially perpendicular to the direction of movement and/or the length of sheet material 104. In other words, some conversion functions may be made across (e.g., between the sides of) sheet material 104. Such conversions may be considered “transverse conversions.”

To perform the transverse conversions, crosshead 150 may move along at least a portion of the width of converting cartridge 130 in a direction generally perpendicular to the direction in which sheet material 104 is fed through converting assembly 114 and/or the length of sheet material 104. In other words, crosshead 150 may move across sheet material 104 in order to perform transverse conversions on sheet material 104. Crosshead 150 may be movably mounted on a track to allow crosshead 150 to move along at least a portion of the width of converting cartridge 130.

Crosshead 150 may include one or more converting instruments, such as a cutting wheel and/or a creasing wheel, which may perform one or more transverse conversions on sheet material 104. More specifically, as crosshead 150 moves back and forth over sheet material 104, a cutting wheel and/or a creasing wheel may create creases, bends, folds, perforations, cuts, and/or scores in sheet material 104.

In addition to being able to create transverse conversions with crosshead 150, conversion functions may also be made on sheet material 104 in a direction substantially parallel to the direction of movement and/or the length of sheet material 104. Conversions made along the length of and/or generally parallel to the direction of movement of sheet material 104 may be considered “longitudinal conversions.”

Longheads 152 may be used to create the longitudinal conversions on sheet material 104. More specifically, longheads 152 may be selectively repositioned along the width of converting cartridge 130 (e.g., back and forth in a direction that is perpendicular to the length of sheet material 104) in order to properly position longheads 152 relative to the sides of sheet material 104. By way of example, if a longitudinal crease or cut needs to be made two inches from one edge of sheet material 104 (e.g., to trim excess material off of the edge of sheet material 104), one of longheads 152 may be moved perpendicularly across sheet material 104 to properly position longhead 152 so as to be able to make the cut or crease at the desired location. In other words, longheads 152 may be moved transversely across sheet material 104 to position longheads 152 at the proper locations to make the longitudinal conversions on sheet material 104.

Longheads 152 may include one or more converting instruments, such as a cutting wheel and/or a creasing wheel, which may perform the longitudinal conversions on sheet material 104. More specifically, as sheet material 104 moves underneath longhead 152, the cutting wheel and/or creasing wheel may create creases, bends, folds, perforations, cuts, and/or scores in sheet material 104.

A control system can control the operation of the converting machine 106. More specifically, the control system can control the movement and/or placement of the various components of the converting machine 106. For instance, the control system can control the rotational speed and/or direction of the feed rollers 134 in order to govern the direction (i.e., forward or backward) the sheet material 104 is fed and/or the speed at which the sheet material 104 is fed through the converting machine 106. The control system can also govern the positioning and/or movement of the converting tools 150, 152 so that the converting tools 150, 152 perform the conversion functions on the desired locations of the sheet material 104.

The control system may be incorporated into converting machine 106. In other embodiments, converting machine 106 may be connected to and in communication with a separate control system, such as a computer, that controls the operation of converting machine 106. In still other embodiments, portions of the control system may be incorporated into converting machine 106 while other portions of the control system are separate from converting machine 106. Regardless of the specific configuration of the control system, the control system can control the operations of converting machine 106 that form box templates 108 out of sheet material 104.

As illustrated in FIGS. 3 and 4 and discussed in greater detail below, converting machine 106 can include a fanfold crease sensing mechanism 200 (also referred to as sensing mechanism 200) that is configured to detect fanfold creases in sheet material 104 as sheet material 104 is fed into converting machine 106. After the sensing mechanism 200 detects the fanfold creases in sheet material 104, the control system can cause converting machine 106 to alter the portion of sheet material 104 used to create box template 108. For instance, in some embodiments, the control system can cause converting machine 106 to cut off the portions of sheet material 104 that include the fanfold creases so the fanfold creases do not end up in specific portions of the box template 108. In other embodiments, the control system can cause the converting machine 106 to cut off a leading edge of sheet material 104 so as to shift the location of the fanfold creases within the box template 108.

With continued attention to FIGS. 3 and 4, attention is also now directed to FIGS. 5 and 6, which illustrate an example embodiment of fanfold crease sensing mechanism 200. In the illustrated embodiment, sensing mechanism 200 is mounted adjacent to guide channel 132 and is configured to monitor sheet material 104 as sheet material 104 is fed into converting machine 106 through guide channel 132. To enable sensing mechanism 200 to monitor sheet material 104 as sheet material passes through guide channel 132, guide plate 132a and/or 132b may include one or more openings 202 therethrough. Sensing mechanism 200 may interact with sheet material 104 through openings 202 to detect fanfold creases in sheet material 104.

In the illustrated embodiment, sensing mechanism 200 includes a first sensor 204 and a second sensor 206. As best seen in FIG. 5, sensors 204, 206 are mounted within converting machine 106 so that first sensor 204 and second sensor 206 are offset from one another in the direction that sheet material 104 is feed through converting machine 106 (indicated by arrow A in FIG. 5). This offset of the sensors 204, 206 may be referred to as a longitudinal offset or feed direction offset. The sensors 204, 206 may be longitudinally offset from one another such that only one of the sensors 204, 206 is disposed above a fanfold crease at a given time. In some embodiments, it can be desirable to position the sensors 204, 206 as close together as possible while only one of the sensors 204, 206 is disposed above the fanfold crease at a time. In some embodiments, the closer the sensors 204, 206 are to each other (e.g., the shorter the longitudinal offset), the more tolerant the sensors 204, 206 become. In other words, by positioning the sensors 204, 206 closer together (while still being spaced apart far enough that only one of the sensors 204, 206 is above a fanfold crease at a time), there is less of a chance that movement of the sheet material 104 (e.g., up and down, closer to or further from the sensors 204, 206) will prevent accurate detection of the fanfold creases. In some embodiments, the sensors 204, 206 have a longitudinal offset of about 5 mm, about 7 mm, about 10 mm, or more, or any value therebetween.

The sensors 204, 206 may communicate with the control system. For instance, each of the sensors 204, 206 may communicate signals to the control system that indicate whether the sensors 204, 206 detect the potential presence of a fanfold crease. The control system may include a filter or algorithm that compares the signals from the sensors 204, 206, and optionally other system data (e.g., the rotational speed and/or direction of the feed rollers 134, the speed the sheet material 104 is being fed through the converting machine 106, etc.) to determine whether a fanfold crease is present or has been detected.

By way of example, the filter or algorithm of the control system may determine whether both sensors 204, 206 have detected the potential presence of a fanfold crease. If both sensors 204, 206 have detected the potential presence of a fanfold crease, the filter or algorithm may determine whether each sensor 204, 206 has detected the presence of the same potential fanfold crease. For instance, the filter or algorithm of may determine a temporal displacement (e.g., a time differential) between the signals from each of the sensors 204, 206 that indicated the potential presence of a fanfold crease.

The filter or algorithm may use the temporal displacement and other system data to determine whether the sensors 204, 206 have detected the same potential fanfold crease. For instance, the filter or algorithm may use the temporal displacement and the speed at which the sheet material 104 is being fed through the converting machine 106 to determine whether the sensors 204, 206 have detected the same potential fanfold crease. If filter or algorithm determines that the sensors 204, 206 have detected the same potential fanfold crease within a predetermined distance, the filter or algorithm will determine that the sensors 204, 206 have detected an actual fanfold crease. The predetermined distance can vary between embodiments. For instance, the predetermined distance may be about 5 mm, about 7 mm, about 10 mm, about 12 mm, about 15 mm, or more, or any value therebetween. In some embodiments, the predetermined distance may be adjustable (e.g., by a user, based on the thickness of the sheet material, etc.).

As illustrated in FIGS. 5 and 6, sensors 204, 206 may optionally be offset from one another in a direction generally perpendicular or transverse to the feed direction. In other embodiments, sensors 204, 206 may not be offset from one another in a direction perpendicular or transverse to the feed direction. For example, sensor 206 may be positioned directly behind sensor 204 (in the feed direction).

The sensors 204, 206 may detect the presence or absence of sheet material 104 within the converting machine 106, and more particularly within guide channel 132. The sensors 204, 206 may communicate to the control system the presence or absence of sheet material 104. If the sensors 204, 206 do not detect the presence of sheet material 104, the control system can provide an alert that sheet material 104 needs to be loaded into converting machine 106. In some embodiments, the system may include a feed changer that selectively feeds different sheet materials into the converting machine 106. The sensors 204, 206 may also detect whether the sheet material from the feed changer is loaded or unloaded correctly and the control system may provide alerts regarding the same.

The sensors 204, 206 can also detect the presence and/or location of fanfold creases in sheet material 104. When sheet material 104 is unfolded from a bale 102, the unfolded fanfold creases may take the form of depressions or projections on or in the surface of the sheet material 104. As sheet material 104 is fed into converting machine 106, and particularly through guide channel 132, sensor 204, 206 may detect the depressions or projections on or in the surface of the sheet material 104. Detection of such depressions or projections provides an indication of the presence and location of fanfold creases in sheet material 104.

The control system can use the detected locations of the fanfold creases to predict the locations of upcoming fanfold creases. Typical sheet material bales 102 have relatively consistent layer dimensions (e.g., distances between fanfold creases on opposing ends of a layer). As a result, the fanfold creases are relatively evenly spaced apart. For instance, some bales 102 have fanfold creases that are spaced apart by about 47 inches.

Using the detected and/or predicted locations of the fanfold creases, the control system can cause the converting machine 106 to cut off portions of sheet material 104 and/or adjust which portions of sheet material 104 are used to form box templates 108. For instance, if the sensors 204, 206 detect a fanfold crease close to the leading end of sheet material 104, the control system can cause the converting machine 106 to cut off the leading portion of sheet material 104 that includes the fanfold crease. By cutting off the leading portion of sheet material 104 that includes the fanfold crease, the risk of the leading edge of the sheet material 104 curling or folding and jamming the converting machine 106 are greatly reduced.

In some cases, the leading end of the sheet material 104 is used to form a glue tab portion of a box template 108. If a fanfold crease extends through the glue tab, the glue tab may curl or fold or have reduced strength, making it difficult to securely attach the glue tab to a panel of the box template 108. For instance, a glue tab with a fanfold crease may not lie flat, which can make it difficult to securely attach the glue tab to another portion of the box template 108 because the glue tab will try to curl or fold away from the other portion of the box template. As a result, a glue joint formed with a glue tab having a fanfold crease may prematurely fail. Similarly, the leading end of the sheet material 104 may be used to form a panel of the box template to which a glue tab is to be attached. If a fanfold crease is located near an edge of the panel to which the glue tab is to be secured, the edge of the panel may curl or fold or have reduced strength, making it difficult to securely attach the glue tab to the panel. To avoid such issues, the control system can cause the converting machine 106 to cut off the leading portion of the sheet material 104 in which the sensors 204, 206 detected the fanfold crease.

In some embodiments, if the sensors 204, 206 detect the presence of a fanfold crease within a predetermined or user configurable range of the leading edge of sheet material 104, the control system can cause the converting machine 106 to cut off the predetermined or user configurable amount of the leading edge of the sheet material 104, including the fanfold crease therein. For instance, in some embodiments, the predetermined range may be the first 25 mm, 50 mm, 75 mm, 100 mm, or 150 mm of the sheet material 104. In such cases, the control system can cause the converting machine 106 to cut off the first 25 mm, 50 mm, 75 mm, 100 mm, or 150 mm of the leading edge of the sheet material 104, including the fanfold crease therein. The box template 108 may then be formed with the following sheet material 104 that does not include a fanfold crease within the predetermined or user configurable range of the leading edge of sheet material 104.

As noted above, fanfold creases are typically relatively evenly spaced apart from one another. As a result, once sensors 204, 206 detect the location of a fanfold crease in sheet material 104, the control system can predict the locations of upcoming fanfold creases. Continually detecting the location of fanfold creases (via sensors 204, 206) and predicting the locations of upcoming fanfold creases can allow for the avoidance of fanfold creases in areas of box template 108 other than just near the leading end thereof.

For instance, detection of fanfold creases (via sensors 204, 206) and prediction of future fanfold crease locations can allow the control system to determine if a fanfold crease would be located within a predetermined range (e.g., 25 mm, 50 mm, 75 mm, 100 mm, or 150 mm) or user configurable range of the end of a box template 108. Having a fanfold crease near the trailing edge (e.g., within the last 25 mm, 50 mm, 75 mm, 100 mm, or 150 mm) of a box template 108 may pose similar problems to those discussed above when a fanfold crease is near a leading end of the box template 108. If the control system determines that a fanfold crease would be located within a predetermined range (25 mm, 50 mm, 75 mm, 100 mm, or 150 mm) or user configurable range of the last or trailing edge of a box template 108, the control system can cause the converting machine 106 to cut the predetermined range (e.g., 25 mm, 50 mm, 75 mm, 100 mm, or 150 mm) or user configurable range off of the leading end of the sheet material 108 and use the following sheet material 104 to make the box template 108. Cutting the predetermined range (e.g., first 25 mm, 50 mm, 75 mm, 100 mm, or 150 mm) or user configuration range off of the leading end of the sheet material 108 will shift where in the box template 108 the fanfold crease is located.

By way of example, if the control system determines that an upcoming fanfold crease would be located within 50 mm of the trailing end of a box template 108, the control system can cause the converting machine 106 to cut 50 mm off of the leading end of the sheet material 104. By cutting 50 mm off of the leading end of the sheet material 104 and using the subsequent sheet material 104 to form the box template 108, the location of the upcoming fanfold crease is shifted further into the box template (e.g., more than 50 mm away from the trailing end thereof). When the fanfold crease is shifted away from the trailing end, the likelihood that the fanfold crease will pose a problem decreases. This can be due to the fanfold crease not being located where a glue joint is to be made or attached. Furthermore, when a fanfold crease is located further away from an edge, the sheet material 104 is less likely to curl or fold in an undesirable manner.

Detecting and predicting the locations of fanfold creases can also enable the system 100 to avoid fanfold creases being located in box templates at other potentially problematic areas. For instance, the control system may cause the converting assembly 106 to cut a length of sheet material 104 off of the leading end thereof so as to shift the location of an upcoming fanfold crease away from a crease between box template panels, flaps, or the like.

Detecting and predicting the locations of fanfold creases can also enable the system 100 to create box templates 108 is different orders to avoid fanfold creases being located in undesirable locations in the box templates 108. For instance, if the control system determines that an upcoming fanfold crease would be located in an undesirable location in a first box template but not would not be in an undesirable location in a second box template (e.g., due to the second box template having different dimensions), the control system can have the converting machine 106 make the second box template before the first box template.

As noted above, the sensing mechanism 200 includes two sensors (i.e., first and second sensors 204, 206) that are offset from one another in the feeding or longitudinal direction. The longitudinal offset between the sensors 204, 206 allows for the readings of the sensors 204, 206 to be compared to one another to determine the presence and location of a fanfold crease.

More specifically, as the sheet material 104 advances past the sensing mechanism 200, each of the sensors 204, 206 will obtain a reading regarding the surface of the sheet material 104. For instance, the readings may indicate the distance between the sensors 204, 206 and the surface of the sheet material 104. When substantially flat portions of the sheet material 104 (e.g., portions without fanfold creases) advance past the sensors 204, 206, as illustrated in FIG. 7, the sensors 204, 206 provide readings that are the same or within a predetermined tolerance.

In contrast, when a fanfold crease advances past the sensors 204, 206, the sensors 204, 206 will detect a change in the surface of the sheet material 104. For instance, as illustrated in FIG. 8, as the fanfold crease advances under sensor 204, sensor 204 will provide a first reading and sensor 206 will provide a second reading that is different than the first reading. The different readings indicate the presence of the fanfold crease.

As the sheet material 104 continues to advance, as illustrated in FIG. 9, the sensor 206 will provide a reading that is different than the reading of the first sensor. In some embodiments, this can provide a verification of the location of the fanfold crease. In other embodiments, the readings from the two sensors can allow for vertical movement of the sheet material 104. As the sheet material 104 advances through the guide channel 132, the sheet material 104 may move up and down slightly because the upper and lower guide plates 132a, 132b are spaced apart by a distance greater than the thickness of the sheet material 104. Using two offset sensors 204, 206 allows for fanfold creases to be detected even if the sheet material 104 moves vertically.

More specifically, rather than maintaining the sheet material 104 in a vertical position and using that position as a baseline for taking readings, one of the sensors 204, 206 will provide a baseline reading that reflects the flat surface of the sheet material 104 while the other sensor 204, 206 will provide a reading related to the fanfold crease. For instance, as shown in FIG. 8, the sensor 206 provides a reading for the flat surface of sheet material 104 regardless of the vertical position of the sheet material 104. The sensor 204, as shown in FIG. 8, provides a reading for the fanfold crease. The difference in the two readings indicates the presence of the fanfold crease.

Additionally, the location of the fanfold crease may be determined using an encoder or similar device to track the feed position of the sheet material 108. When the sensors 204, 206 detect the presence of a fanfold crease, the control system may use the current feed position (determined with the encoder) to determine the location of the fanfold crease.

As the sheet material 104 continues to advance to the position shown in FIG. 9, the sensor 204 will provide the baseline reading based on the flat surface of the sheet material (again regardless of the vertical position of the sheet material 104). The sensor 206 will now provide a reading for the fanfold crease. Again, the difference in the two readings indicates the presence and location of the fanfold crease.

The sensors 204, 206 may take various forms. For instance, in some embodiments the sensors 204, 206 take the form of lasers that are able to detect the distance to the surface of the sheet material 104. In other embodiments, the sensors 204, 206 may take the form of mechanical devices that can detect changes in the surface of the sheet material 104. For instance, a mechanical sensor may contact the surface of the sheet material 104 and detect changes in the surface of the sheet material 104 (e.g., depressions/projections of a fanfold crease) by increases or decreases in the position of the mechanical sensor, etc. In still other embodiments, the sensors 204, 206 may take the form of optical sensors or vision (camera) systems.

Although the illustrated embodiment has shown both of sensors 204, 206 being positioned above the sheet material 104, this is merely exemplary. In other embodiments, a sensing mechanism may include two sensors positioned below the sheet material 104. In still other embodiments, a sensing mechanism may include one sensor positioned above the sheet material 104 and a second sensor positioned below the sheet material 104.

Regardless of the specific type of sensors used or the location of the sensors, the sensors may be able to provide readings with a predetermined accuracy. For example, fanfold creases typically have depths of between about 0.5 mm and about 4 mm. In order to accurately detect the fanfold creases, the sensors may have an accuracy level of about two or three times less than the depth of the fanfold creases. Thus, for instance, the sensors may provide readings with an accuracy of about 0.2 mm, 0.5 mm, 1 mm, 1.25 mm, 1.5 mm, or 2 mm. In other words, the sensors may be able to detect depressions or projections on the surface of the sheet material 104 that are 0.5 mm, 1 mm, 1.25 mm, 1.5 mm, 2 mm, or 4 mm deep or tall.

Additionally, the sensors may be able to detect the fanfold creases even when the sheet material 104 is being advanced into the converting machine 106 and past the sensors at a relatively fast rate. For instance, the sensors may be able to detect the fanfold creases when the sheet material 104 is being advanced at a rate of 0.25 m/s, 0.5 m/s, 0.75 m/s, 1 m/s. 1.25 m/s, or 1.5 m/s.

While the sensing mechanism 200 has been shown and described in connection with a particular converting machine (i.e., converting machine 106), it will be appreciated that sensing mechanism 200 may be incorporated into a variety of different converting machines or other sheet material processing equipment.

It will be appreciated that relative terms such as “horizontal,” “vertical,” “upper,” “lower,” “raised,” “lowered,” “above,” “below” and the like, are used herein simply by way of convenience. Such relative terms are not intended to limit the scope of the present invention. Rather, it will be appreciated that converting assembly 114 may be configured and arranged such that these relative terms require adjustment.

The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. Thus, the described embodiments are to be considered in all respects only as illustrative and not restrictive. The scope of the invention is, therefore, indicated by the appended claims rather than by the foregoing description. All changes that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

CONVERTING MACHINE WITH FOLD SENSING MECHANISM

Information

Publication Number

Date Filed

Date Published

Inventors

Original Assignees

CPC

International Classifications

Abstract

Description

Claims

Parent Case Info

Provisional Applications (1)