Patent Application
20200398551
Example embodiments generally relate to printing technology, and particularly relate to technology for printing measuring tape and other such products that employ a long flexible substrate.
Measuring tapes are typically printed using a conventional flexographic printing process. This type of printing process is also used to print on other flexible substrates like bread bags, product wrappers, and the like. In flexographic printing, the image is created by applying ink directly to a flexible printing plate, which is then brought into contact with stock to transfer the ink. The printing plate is a multi-layered, light sensitive flat (but flexible) sheet that is “exposed” and “developed” to create the printing plate. The printing plate is wrapped around a cylinder (or belt) for printing
When placed on a press, an anilox roller transfers ink from an ink pan to the raised areas of the printing plate. An impression cylinder creates a light pressure between the substrate and the plate to allow the ink to transfer to the stock. The largest commercially available print plate is 50 by 80 inches. Thus, to print a 25 ft tape, four plates are needed, and three joins exist between the four plates. For metric tapes at 8 m, five plates with four joins placed every 2010 mm would be required.
As can be appreciated from the description above, relative to printing on longer flexible substrates such as measuring tapes, the length of the printing plate available has been the limiting factor. Moreover, the joins between the plates create gaps in the print. Traditionally, the joins are hidden in a non-print area between gradation marks. This means that it is impossible to print a solid color on a tape measure. Thus, traditional measuring tapes are surface painted (or powder coated) in a light color (e.g., yellow or white) that covers the entire surface of the measuring tape. Then, dark (typically black) gradations are printed on the measuring tape, and another dark color (typically red) is used to print the numbers.
Accordingly, it may be desirable to continue to develop improved mechanisms by which to implement printing on flexible substrates so that the problem of design and length limitation due to the need to hide joins can be overcome.
Some example embodiments may enable the provision of a device that allows printing without creating the need to hide joins, as described above. In this regard, some example embodiments may provide for the use of a continuous multilayered cylinder without joins in the printing process. Thus, a continuous repeating pattern can be provided to allow, for example, printing light numbers and gradations on a dark base layer.
In an example embodiment, a printing assembly is provided. The printing assembly may include a first continuous cylinder and a first jogging assembly. The first continuous cylinder may be configured to apply print media to a flexible substrate responsive to contact with the flexible substrate. The first continuous cylinder may include a plurality of partitions configured such that only one of the partitions is aligned for contact with the flexible substrate at any given time, and each of the partitions may have a unique print characteristic associated therewith. The first jogging assembly may be operably coupled with the first continuous cylinder to move the first continuous cylinder along an axis thereof to change alignment of the partitions relative to the flexible substrate.
In another example embodiment, a method of printing on a flexible substrate is provided. The method may include moving a flexible substrate proximate to a continuous cylinder and applying print media to the flexible substrate responsive to contact between the continuous cylinder and the flexible substrate. The continuous cylinder may include a plurality of partitions configured such that only one of the partitions is aligned for contact with the flexible substrate at any given time, and each of the partitions has a unique print characteristic associated therewith. The method may further include determining when a first partition of the continuous cylinder has fully applied print media to the flexible substrate, and moving the continuous cylinder along an axis thereof to align a second partition of the continuous cylinder with the flexible substrate.
Having thus described some example embodiments in general terms, reference will now be made to the accompanying drawings, which are not necessarily drawn to scale, and wherein:
Some example embodiments now will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all example embodiments are shown. Indeed, the examples described and pictured herein should not be construed as being limiting as to the scope, applicability or configuration of the present disclosure. Rather, these example embodiments are provided so that this disclosure will satisfy applicable legal requirements. Like reference numerals refer to like elements throughout. Furthermore, as used herein, the term “or” is to be interpreted as a logical operator that results in true whenever one or more of its operands are true. As used herein, operable coupling should be understood to relate to direct or indirect connection that, in either case, enables functional interconnection of components that are operably coupled to each other.
As indicated above, some example embodiments may relate to the provision of a device that allows printing without creating the need to hide joins so that, for example, printing light numbers and gradations on a dark base layer becomes possible. This is accomplished by employing a continuous multilayered cylinder without joins.
As shown in
Laser ablation is a process of removing material from a solid (or occasionally liquid) surface by irradiating the material with a laser beam. At low laser flux, the material is heated by the absorbed energy from the laser, and the material evaporates or sublimates. Of note, in some cases, other processes could be employed instead of laser ablation. For example, laser engraving or chemical etching may be employed to replace the laser ablation layer with a corresponding layer dependent upon the removal process employed. However, laser ablation may be preferred for some applications. When laser ablation is employed, an image can be lasered onto the surface of the cylinder 100. The cylinder 100 is created as a continuous cylinder sleeve with no joins. Thus, the cylinder 100 is essentially a solid print cylinder (i.e., having no joins). When printing with such a cylinder, the limitation on printing becomes the capability of the laser ablation process to image the cylinder and the length of the “repeat” on, for example, a tape measure.
On an 8 m measuring tape, the repeat may occur, for example, in increments of 10 cm. On a 25 ft measuring tape, the repeat occurs in 12 inch increments. To overcome the repeat length issue, the cylinder 100 may be partitioned. Thus, for example, the cylinder 100 may be a continuous cylinder with repeat lengths broken down into multiple partitions of a given length (e.g., 1 m, 1 ft, etc.). The cylinder 100 could then be axially moved (e.g., jogged) to use corresponding different partitions at appropriate times to access each respective section (e.g., meter) of print so that a full and unique (e.g., 8 m) length of measuring tape can be created. This concept can be applied to any desirable length of tape, and can be used for metric or imperial tapes.
By using this process, or combination of processes, a unique capability is provided relative to enabling the creation of a continuous solid print design with changing features over the length of the design. Moreover, the partitioning and jogging of the continuous cylinders allows repeat lengths to be printed that are greater than the circumference of the largest available cylinder. As such, there is no theoretical limit to the length that can be printed.
As shown in
After the print medium has been transferred to the flexible substrate 300, one or more UV dryers 330 may be provided to dry the print medium on the flexible substrate 300. Thus, for example, the ink applied at the first set of continuous cylinders 322 may be dried on the flexible substrate 300 by the UV dryers 330. In some cases, the first set of continuous cylinders 322 may apply print medium to define print applied directly to the flexible substrate 300. However, in other cases, the first print assembly 320 may actually apply the print over the top of a base print layer applied by a base roller 340 and corresponding UV dryer 342. The base print layer could be a continuous base color or an initial pattern. In some cases, the base roller 340 may provide gradations and the other continuous cylinders may apply number sequences that need to change (e.g., via jogging to different partitions) based on location.
In cases where it is desirable to print on both sides of the flexible substrate 300, a second print assembly 350 may be provided. The second print assembly 350 may operate similarly to the first print assembly 320, except that the second print assembly 350 places continuous cylinders of a second set of continuous cylinders 352 into contact with the opposite side of the flexible substrate 300 to that which was printed on by the first set of continuous cylinders 322.
Thus, for example, the second set of continuous cylinders 352 may be configured to contact (and print on) a second side of the flexible substrate 300 (opposite the first side), while an impression cylinder 354 contacts the opposite side of the flexible substrate 300 (i.e., the first side). Each of the continuous cylinders may have print medium (e.g., ink) transferred thereon by a media applicator 356 immediately before the continuous cylinders roll to the point where the flexible substrate 300 is pressed between each continuous cylinder of the second set of continuous cylinders 352 and the impression cylinder 354. Thus, at the point where the flexible substrate 300 is pressed between each continuous cylinder of the second set of continuous cylinders 352 and the impression cylinder 354, the print medium is transferred to the second side of the flexible substrate 300.
After the print medium has been transferred to the second side of the flexible substrate 300 by the second print assembly 350, one or more UV dryers 360 may be provided to dry the print medium on the flexible substrate 300. Thus, for example, the ink applied at the second set of continuous cylinders 352 may be dried on the flexible substrate 300 by the UV dryers 360. The flexible substrate 300 may then be provided to finish rolls 370 on which the finished product is collected.
As can be appreciated from
Some or all of the continuous cylinders may include partitions that have unique patterns (e.g., gradations and/or number sequences) provided thereon. Thus, the cylinders may be jogged at corresponding appropriate times to cycle to a next partition at the appropriate time. In some cases, one or more cylinders may be used for printing gradations, and another one or more different cylinders can be used to print number sequences in a same or different color. However, in other cases, the same cylinders could be used to print both gradations and number sequences (e.g., in the same color). The jogging may occur along the axial direction of each of the continuous cylinders (i.e., into or out of the page for
Example embodiments may enable continuous printing to be achieved with multiple colors on single or double sided tapes. Thus, for example, three color printing can be performed even in situations where the base color is a darker color than the colors printed thereon via inline printing. Inline powder coating and/or inline clear coating may be expansion possibilities by employing the technology described herein. Example embodiments may also enable single minute exchange of dies (SMED) to be achieved, which would eliminate significant press downtime. Costly photopolymer belt replacement may also be eliminated by employing example embodiments.
While any given one of the partitions is aligned with the flexible substrate 410, the corresponding unique print characteristic associated therewith can be applied to the flexible substrate 410 by contact between the flexible substrate 410 and the first continuous cylinder 420. Of note, the first continuous cylinder 420 may be one of a plurality of such cylinders that may print respective different colors or designs on the same side of the flexible substrate 410. Color print applied to the flexible substrate 410 may be dried by a first dryer 422.
When the entire perimeter or circumference of a particular one of the partitions of the first continuous cylinder 420 has been used for printing, a jogging assembly 424 may be used to shift the position (and therefore alignment) of the first continuous cylinder 420 axially so that a next partition is aligned with the flexible substrate 410. The next partition may then print its own unique print characteristic upon the flexible substrate 410. When the next partition has been completely traversed, then still another partition may be aligned and used for printing.
Transitioning between each partition is mechanically conducted by the jogging assembly 424. The jogging assembly 424 may be embodied as a gear set, servo, electric motor, or any other such suitable device for translating the position of the first continuous cylinder 420 axially. In an example embodiment, each partition of the first continuous cylinder 420 may be similar in size and therefore have the same perimeter or circumference. Moreover, the width of the flexible substrate 410 may substantially match the width of each partition. Thus, the jogging assembly 424 may apply an axial movement to the first continuous cylinder 420 that is the same (e.g., substantially equal to the width of the partitions) for each partition transition. The first continuous cylinder 420 may therefore have the ability to repeat printing with each new partition by sequentially moving to adjacent partitions in a single direction until the full complement of partitions has been cycled through completely. At that point, the full length of the flexible substrate 410 should have been printed.
If both sides of the flexible substrate 410 are to be printed on, the printing assembly 400 may include a second continuous cylinder 430 (or multiple instances thereof), a second dryer 432, and a second jogging assembly 434, which may operate similar to the corresponding components described above, but do so relative to the opposite side of the flexible substrate 410. In some cases, the diameter of the second continuous cylinder 430 (and therefore also the perimeter or circumference thereof) may be different from the diameter of the first continuous cylinder 420. Accordingly, different jogging times may be needed for respective ones of the first continuous cylinder 420 and the second continuous cylinder 430. Furthermore, the number of partitions of the second continuous cylinder 430 may be different from the number of partitions of the first continuous cylinder 420. Accordingly, a different number of jogging operations may be performed for respective ones of the first continuous cylinder 420 and the second continuous cylinder 430 to cycle through all partitions.
In an example embodiment, a control unit 450 may be operably coupled to each of the first jogging assembly 424 and the second jogging assembly 434 in order to control the timing and implementation of the jogging activities. Thus, for example, the control unit 450 may be aware of the number of partitions, width of partitions, speed of motion of the flexible substrate 410, perimeter or circumference of the partitions, etc., in order to enable the control unit 450 to manage jogging activities. In an example embodiment, the printing assembly 400 may include one or more instances of a sensor 460 to facilitate the operation of the control unit 450.
The sensor 460 (or sensors) may detect the speed of motion of the flexible substrate 410. In this regard, the sensor 460 may read the speed at which partitions pass the sensor 460 to determine such speed, or may determine the speed of one or more rollers or cylinders to determine such speed. In some cases, the sensor 460 may also detect location information and be able to determine or infer location proximate to other components of the printing assembly 400. Thus, based on the location information and/or speed information provided by the sensor 460, the control unit 450 may intelligently direct the initiation of jogging activity. The sensor 460 may be an optical sensor in some cases.
In an example embodiment, the control unit 450 may be a programmable logic controller (PLC), field programmable gate array (FPGA), or other processing circuitry capable of intelligently controlling the jogging activity. As such, in some cases, the control unit 450 may include processing circuitry such as a processor and memory. The memory may store instructions and/or data (e.g., information descriptive of the circumference of each partition and number of partitions of each cylinder) along with instructions for triggering the jogging activity.
In some cases, the method (or portions or operations thereof) may be augmented or modified, or additional optional operations may be included. For example, in some cases, the first continuous cylinder may include a circumference having a laser ablated surface that defines the unique print characteristic of each of the partitions. In an example embodiment, the unique print characteristic may define a unique number set or sequence for each of the partitions. In some cases, the unique number set of each partition sequentially follows a number set of a preceding adjacent partition. In an example embodiment, moving the continuous cylinder may be performed via a control unit operably coupled to a jogging assembly. In some cases, the control unit stores information indicative of a circumference of the continuous cylinder, and the control unit determines location information regarding the flexible substrate to determine when to trigger the jogging assembly to adjust alignment of the continuous cylinder relative to the flexible substrate. In an example embodiment, the method may further include employing a sensor to determine a speed of the flexible substrate. In some cases, applying the print media to the flexible substrate may include printing a base layer on the flexible substrate. The base layer may be a dark color, and printing gradations or numbers over the base layer may include printing the gradations or numbers in a color that is lighter than the dark color of the base layer.
By using the continuous cylinders of an example embodiment, continuous unique or non-repeating patterns can be printed with virtually any combination of colors and in any desirable length. Thus, for example, example embodiments may allow a solid black area to be printed with the base layer showing through as the gradations. Of note, the base layer could be any color.
Many modifications and other embodiments of the inventions set forth herein will come to mind to one skilled in the art to which these inventions pertain having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the inventions are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Moreover, although the foregoing descriptions and the associated drawings describe exemplary embodiments in the context of certain exemplary combinations of elements and/or functions, it should be appreciated that different combinations of elements and/or functions may be provided by alternative embodiments without departing from the scope of the appended claims. In this regard, for example, different combinations of elements and/or functions than those explicitly described above are also contemplated as may be set forth in some of the appended claims. In cases where advantages, benefits or solutions to problems are described herein, it should be appreciated that such advantages, benefits and/or solutions may be applicable to some example embodiments, but not necessarily all example embodiments. Thus, any advantages, benefits or solutions described herein should not be thought of as being critical, required or essential to all embodiments or to that which is claimed herein. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
This application is a continuation of U.S. application Ser. No. 16/088,751 filed on Sep. 26, 2018, which is the U.S. national stage entry of international application number PCT/US2017/024425 filed on Mar. 28, 2017, which claims priority to U.S. application No. 62/315,171 filed Mar. 30, 2016, the entire contents of which are incorporated by reference it its entirety.
| Number | Date | Country | |
|---|---|---|---|
| 62315171 | Mar 2016 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 16088751 | Sep 2018 | US |
| Child | 17014338 | US |
