This application is filed under 35 U.S.C. § 371 as a National Stage of PCT International Application No. PCT/US2018/032282, filed on May 11, 2018, in the U.S. Patent and Trademark Office, the disclosure of which is incorporated by reference herein in its entirety.
A finisher refers to an apparatus for processing a recording medium, such as paper, supplied from an image forming apparatus. The finisher can be connected to the image forming apparatus to receive the recording medium during a job, and is in communication with the image forming apparatus. For example, the finisher may perform a stapling operation, an alignment operation, and/or a folding operation with respect to the recording medium supplied from the image forming apparatus.
An image forming apparatus refers to an apparatus that forms images on a recording medium according to inputted signals. Examples of an image forming apparatus include a printer, a copy machine, a scanner, a facsimile, and a multi-function peripheral device that combines and implements various functions of the printer, copy machine, scanner, and/or facsimile. Examples of a printer include an inkjet printer or a laser printer.
Before a recording medium is compiled and a finishing operation is performed on the recording medium by a finisher, an image forming apparatus may perform a conditioning process on the recording medium. For example, the conditioning process may remove water, smooth the recording medium, or a combination thereof. The conditioning process may be more difficult when there is a significant amount of ink placed on the recording medium. To remove the water from the recording medium, a temperature of a heated pressure roller within the image forming apparatus may be raised, however the increase temperature can result in a curled or “smiling” recording medium.
When the curled “smiling” recording medium is transported to a compiler area of the finisher, the curled “smiling” recording medium can fill the compiler area. The compiler area may include paddles to pull a recording medium toward an end portion of a registration tray for a finishing operation to be performed on the recording medium. However, because the recording medium is curled, this may prevent the paddles from pulling the recording medium toward the end portion of the registration tray. Thus, a finishing operation may have poor compiling of recording media, the finishing operation may be poorly performed on the recording media, and a size of a stack of recording media for which the finishing operation is to be performed on may be limited.
According to various examples of the disclosure, a finisher includes a knockdown apparatus which knocks down a recording medium during the compiling process of the recording medium so as to flatten the recording medium and eliminate or decrease the curl. Because the curl can be decreased or eliminated, a job quality of compiled media stacks may be improved, increased temperatures may be utilized in the image forming apparatus to remove moisture from a recording medium, and a stack capacity may be increased.
Various examples of the disclosure will now be described with reference to the accompanying drawings, wherein like reference characters denote like elements. Examples to be explained in the following may be modified and implemented in various different forms.
When it is stated in the disclosure that one element is “connected to” or “coupled to” another element, the expression encompasses not only an example of a direct connection or direct coupling, but also a connection with another element interposed therebetween. Further, when it is stated herein that one element “includes” another element, unless otherwise stated explicitly, it means that yet another element may be further included rather than being excluded.
The printer 100 prints an image on a sheet-type medium, which may also be referred to as a recording medium, provided from a paper feeder. The paper feeder may be, for example, a main cassette feeder 210 installed under the printer 100, or secondary cassette feeders 220 and 230 installed under the main cassette feeder 210. Although not illustrated, the paper feeder may further include a multi-purpose tray (MPT), a high capacity feeder installed at a side of the printer 100, or a combination thereof.
The printer 100 may also include a control panel 130 to receive an input from a user to control the image forming apparatus, for example to perform a function of the image forming apparatus. The control panel 130 may include a keyboard, a button, a display, or combinations thereof for the user to operate the image forming apparatus. The display may be a touchscreen to receive the input from the user.
The printer 100 may print an image on a recording medium by using various printing methods such as an electrophotography method, an inkjet method, a thermal transfer method, and a thermal sublimation method. For example, the image forming apparatus may print a color image on the recording medium by using an inkjet method. The printer 100 may be a S path-type of printer or a C path-type of printer, for example.
The scanner 300 reads an image recorded on a document. The scanner 300 may have any of various structures such as a flatbed mechanism where a document is at a fixed position and an image is read while a reading member is moved, a document feeding mechanism where a reading member is at a fixed position and a document is fed, and a combination structure thereof.
The finisher 400 may include a sheet folding device (not illustrated) for folding, one or more times, the recording medium discharged from the printer 100. The finisher 400 may further include an alignment device (not illustrated) for aligning the recording medium discharged from the printer 100. The alignment device may have a structure for stapling the recording medium at an end portion thereof or punching a hole in an end portion of the recording medium. The finisher 400 may further include a stapler for stapling the paper at a center portion thereof. Other example processes or functions the finisher 400 may perform include hole punching, binding, embossing, gluing, coating, varnishing, foil stamping, texturing, lamination, cutting, creasing, stacking, binding, splicing, rewinding, or combinations thereof.
The finisher 400 may include a controller 410 and machine readable storage 420. The controller 410 may execute instructions stored in the machine readable storage 420. The printer 100 may also include a controller 110 and machine readable storage 120. The finisher 400, the printer 100, and the external device 700 may be connected with one another in a wired and/or wireless manner such that the finisher 400, printer 100, and external device 700 can communicate with one another to exchange information, including job information regarding an image forming job performed or to be performed by the image forming apparatus including the printer 100 and scanner 300, a finishing job performed or to be performed by the finisher 400, or combinations thereof.
The controllers 110, 410, 710 may include, for example, a processor, an arithmetic logic unit, a central processing unit (CPU), a graphics processing unit (GPU), a digital signal processor (DSP), an image processor, a microcomputer, a field programmable array, a programmable logic unit, an application-specific integrated circuit (ASIC), a microprocessor, or combinations thereof.
The machine readable storages 120, 420, 720 may be any electronic, magnetic, optical, or other physical storage device that stores executable instructions. For example, the machine readable storages 120, 420, 720 may include a nonvolatile memory device, such as a Read Only Memory (ROM), Programmable Read Only Memory (PROM), Erasable Programmable Read Only Memory (EPROM), and flash memory, a USB drive, a volatile memory device such as a Random Access Memory (RAM), a hard disk, floppy disks, a blue-ray disk, or optical media such as CD ROM discs and DVDs, or combinations thereof.
The external device 700 may include a personal computer, a laptop, a tablet, a smartphone, a server, or combinations thereof. The external device 700 may be used to control the finisher 400, the printer 100, or combinations thereof. For example, the external device 700 may receive an input from a user regarding a job or function of the finisher 400, the printer 100, or combinations thereof. The external device 700 may include a user interface 730 to receive the input and a display 740 to display information regarding the finisher 400 and the printer 100. The user interface 730 may include, for example, a keyboard, a mouse, a joystick, a button, a switch, an electronic pen or stylus, a gesture recognition sensor, an input sound device or voice recognition sensor such as a microphone, an output sound device such as a speaker, a track ball, a remote control, a touchscreen, or combinations thereof. The external device 700 may also include a display 740.
Example paths traveled on by the recording medium in the finisher 400 will now be described. The recording medium is received by the finisher 400 from the printer 100 at an input port 451. Depending on the design of the finisher 400 and the processes to be performed on the recording medium, there may be numerous paths that the recording medium may be transported on before being output to an output bin. For example, as illustrated in
As illustrated in
When a finishing process is to be performed with respect to a recording medium and the recording medium is transported along the lower path 454, the recording medium may be transported to a section of the finisher 400 referred to as a compiler 500. The compiler 500 may include a stapler 510 to staple the recording medium to another recording medium or to recording media before the stapled media is ejected or discharged from the compiler 500 and output to the lower output bin 456. The compiler 500 may also include a register tray 520, a pusher bar 550 and a tamper 560 (see
As illustrated in
The driving source 430 may include a motor, a solenoid, another electromechanical device, or combinations thereof. For example, as illustrated in
An example path along which the recording medium travels to the compiler 500 will now be described with respect to
As the recording medium drops down from the exit rollers 457 to the register tray 520 the pusher bar 550 may rotate to push downward against a trailing edge of the recording medium to assist the recording medium in dropping down to the register tray 520. When the recording medium is located on the register tray 520 the rotatable shaft 540 and paddles 531 may rotate in the forward direction. For example, during the compiling of the recording medium, the controller 410 may transmit a signal to the driving source 430 to control the driving source 430 to rotate the rotatable shaft 540 in the forward direction. Also, when the recording medium is located on the register tray 520 the tamper 560 may be moved in an inward direction toward opposite sides of the recording media to align the stacked recording media in a widthwise direction of the recording medium. The tamper 560 may be moved in the inward direction toward opposite sides of the recording media a plurality of times to align the stacked recording media in the widthwise direction.
As shown in
When the knockdown device 800 is in the resting position P1 and a recording medium is transported from the exit rollers 457 to the register tray 520 in the compiler 500, the recording medium may be partially ejected in an outward direction toward the lower output bin 456, before being pulled back in toward the end portion 521 of the register tray 520 by the paddles 531 of the compiler 500. When the recording medium is partially ejected in the outward direction toward the lower output bin 456, a leading edge of the recording medium contacts inner sides of the knockdown devices 800 and causes the knockdown devices 800 to rotate upward. An amount of rotation of the knockdown devices 800 in the upward direction may be depend on various factors including the force applied to the knockdown devices 800 by the recording medium according to the speed of travel of the recording medium, a weight of the recording medium, a weight of the knockdown device 800, or combinations thereof, for example. After the knockdown devices 800 swing upward, the knockdown devices 800 then rotate downward by a force of gravity to apply a downward force on an upper surface of the recording medium. The knockdown devices 800 may apply the downward force on the upper surface of the recording medium as the recording medium is being pulled back toward the end portion of the register tray 520. Therefore, the knockdown device 800 can reduce a curl in the recording medium when in the resting position and also by applying a downward force when the knockdown device 800 rotates downward and contacts the upper surface of the recording medium.
The knockdown device can have various shapes. For example, the knockdown device may have a substantially rectangular shape as shown by the knockdown device 800′ illustrated in
A width of the knockdown device in the widthwise direction may also be varied. For example, a wider width of the knockdown device 800′ compared to the knockdown device 800 in the widthwise direction may allow the knockdown device 800 to contact a greater area of the recording medium and to contact different types of recording media with narrower widths.
A weight of the knockdown device along a direction perpendicular to the widthwise direction and an axial direction of the rotatable shaft may also be varied. For example, a first end of the knockdown device, opposite of a second end of the knockdown device coupled to the upper paper guide 570, may have a greater weight compared to the second end of the knockdown device coupled to the upper paper guide. The greater weight of the first end of the knockdown device may allow a greater downward force to be applied to the recording medium.
Accordingly, the rotatable knockdown devices 800 and 800′ shown in
The knockdown device 900 is mounted to the upper paper guide 570. For example, each arm 902a, 902b is coupled to the upper paper guide 570 by a rotatable knockdown shaft 904a, 904b that is formed as a protrusion or pin which protrudes from an outer side of each of the arms 902a, 902b. The rotatable knockdown shafts 904a, 904b are inserted into a groove or pinhole 572 that is formed in a portion of the upper paper guide 570. The knockdown device 900 is rotatable about the rotatable knockdown shafts 904a, 904b, such that a rotation axis of the knockdown device 900 is parallel to and offset from a rotation axis of the rotatable shaft 540.
The upper paper guide 570 may include a cutout or recess 573 formed therein to accommodate the arms 902a, 902b and body 901 of the knockdown device 900 when the knockdown device 900 is in an upper position. The ability to store the knockdown device 900 in the recess 573 while the knockdown device 900 is not being utilized allows the knockdown device 900 to avoid contact with a recording medium being compiled as well as recording media stacked in the register tray 520. Also, a sound-dampening material may be provided in the recess 573 so that when the knockdown device 900 returns to the upper position, a noise may be reduced or minimized. A sound-dampening material can also be provided on an upper side of the knockdown device 900. The sound-dampening material may include an acoustic foam, for example.
To retain the knockdown device 900 in the upper position, an elastic member 907 may be coupled between a hook 574 formed in the upper paper guide 570 and a receptacle 905 provided in an end portion or tab 906a of arm 902a of the knockdown device 900, as shown in
A plurality of ribs 903 may be formed on a lower surface of the knockdown device 900. The ribs 903 protrude from the lower surface of the knockdown device 900 such that when the knockdown device 900 contacts the recording medium a surface area of the knockdown device 900 that contacts the recording medium is less than a surface area of the knockdown device 900 that contacts the recording medium when no ribs are provided. Therefore, a noise level caused by the knockdown device 900 striking the recording medium can be reduced. The knockdown device 900 may be made of plastic, for example.
The knockdown device 900 may include surfaces which are chamfered, curbed, or angled in such a way to reduce a noise associated with rotating the knockdown in an upward and downward motion. For example, the body 901, the arms 902a, 902b, the ribs 903, or a combination thereof, may have curved surfaces.
An operation of the knockdown device 900 will now be described according to an example. When the recording medium drops down from the exit rollers 457 to the register tray 520 the pusher bar 550 may rotate to push downward against a trailing edge of the recording medium to assist the recording medium in dropping down to the register tray 520. When the recording medium is located on the register tray 520 the rotatable shaft 540 and paddles 531 may rotate in the forward direction. The rotatable shaft 540 and paddles 531 may rotate in the forward direction once or a plurality of times. For example, during the compiling of the recording medium, the controller 410 may transmit a signal to the driving source 430 to control the driving source 430 to rotate the rotatable shaft 540 in the forward direction a predetermined number of times. The driving source 430 may be a motor, for example. The signal or command indicates to the driving source 430 the number of times the rotatable shaft 540 is to be rotated by the driving source 430 in the forward direction during a compiling operation with respect to the recording medium. A number of rotations of the rotatable shaft 540 in the forward direction for compiling a recording medium can vary. For example, the controller 410 can determine the number of rotations of the rotatable shaft 540 in the forward direction based on information regarding the recording medium, information regarding the finishing operation, or combinations thereof.
Information regarding the recording medium and finishing operation may be obtained from the printer 100, the finisher 400 itself, from another source, or combinations thereof. As an example, when a job is received at the printer 100, the printer 100 may communicate with the finisher 400 by transmitting a signal including job information to the finisher 400 that identifies, or is indicative of, various characteristics pertaining to the job. For example, the job information may include a number of recording media to be compiled, a type of recording medium, a thickness of the recording medium, an ink content on the recording medium, or combinations thereof. The job information may be in the form of a code. The controller 410 of the finisher 400 can interpret the job information received from the printer 100, for example by interpreting the code, to obtain the job information. The controller 410 can store the job information in the machine readable storage 420.
According to an example, because the one-way clutch 542 prevents rotation of the cams 541a, 541b during forward rotation of the rotatable shaft 540, the cams 541a, 541b do not rotate, and the knockdown device 900 is not rotated, when the rotatable shaft 540 is rotated in the forward direction.
After completion of the forward rotation of the rotatable shaft 540 and paddles 531, the rotatable shaft 540 may be rotated in a reverse direction. For example, the controller 410 may transmit a signal to the driving source 430 to control the driving source 430 to rotate the rotatable shaft 540 in the reverse direction a predetermined number of times. According to an example, because the one-way clutch 542 permits rotation of the cams 541a, 541b during reverse rotation of the rotatable shaft 540, the cams 541a, 541b rotate and the knockdown device 900 is rotated downward to contact the recording medium. For example, the knockdown device 900 may contact the leading edge or front portion of the recording medium. The cams 541a, 541b are rotated a same number of times the rotatable shaft 540 is rotated in the reverse direction. The knockdown device 900 performs the knockdown action a same number of times the rotatable shaft 540 is rotated in the reverse direction. The number of reverse rotations of the rotatable shaft 540 may be once or a plurality of times. The number of reverse rotations of the rotatable shaft 540 may be less than the number of times the rotatable shaft 540 and paddles 531 are rotated in the forward direction for paddling the recording medium. As another example, the controller 410 may determine no reverse rotation of the rotatable shaft 540 is to be performed. For example, the controller 410 may determine, based on a type of recording medium for example, that the recording medium is unlikely to have a curl and therefore the knockdown is not performed by the knockdown device 900.
Actuation of the knockdown device 900 is based on the rotation of the rotatable shaft 540 to drive the motion of the knockdown device 900, for example. The cams 541a, 541b are coupled to the rotatable shaft 540 through a one-way clutch or friction clutch so as to control the timing of the knockdown actuation. The knockdown device 900 can be activated such that rotation of the rotatable shaft 540 in the reverse direction causes the knockdown device 900 to lower once per cycle. According to this operation, actuation of the knockdown device 900 is performed independent of a number of forward paddles performed to compile media. As another example, rotation of the knockdown device 900 may be based on the rotation of the rotatable knockdown shafts 904a, 904b, which may be combined as a single shaft, to drive the motion of the knockdown device 900. That is, a driving source, other than a driving source used to drive rotatable shaft 540, may be provided to drive rotation of the rotatable knockdown shaft and the knockdown device 900.
The knockdown device 900 is rotated to contact the recording medium and may be immediately rotated back upwards to the upper position to be stored in the recess 573 of the upper paper guide 570. The knockdown device 900 may be lowered for a duration long enough to contact the recording medium and eliminate or reduce the curl in the recording medium, while also not delaying completion of the compiling and finishing operations unnecessarily. Also, because the knockdown actuation occurs during a reverse rotation of the rotatable shaft 540, interference between the knockdown device 900 and operation of the tamper 560 and paddles 531 may be avoided.
The knockdown device 900′ is mounted to the upper paper guide 570′. For example, each arm 902a′, 902b′ is coupled to the upper paper guide 570′ by a rotatable knockdown shaft 904a′, 904b′ that is formed as a protrusion or pin which protrudes from an outer side of each of the arms 902a′, 902b′. The rotatable knockdown shafts 904a′, 904b′ are inserted into a respective groove or pinhole 572′ that is formed in a portion of the upper paper guide 570′. The knockdown device 900′ is rotatable about the rotatable knockdown shafts 904a′, 904b′, such that a rotation axis of the knockdown device 900′ is parallel to and offset from a rotation axis of the rotatable shaft 540. As can be seen from
The upper paper guide 570′ may include a cutout or recess 573′ formed therein to accommodate the arms 902a′, 902b′, and body 901′ of the knockdown device 900′ when the knockdown device 900′ is in an upper position. The ability to store the knockdown device 900′ in the recess 573′ while the knockdown device 900′ is not being utilized allows the knockdown device 900′ to avoid contact with a recording medium being compiled as well as recording media stacked in the register tray 520. Also, a sound-dampening material may be provided in the recess 573′ so that when the knockdown device 900′ returns to the upper position, a noise may be reduced or minimized. A sound-dampening material can also be provided on an upper side of the knockdown device 900′.
A plurality of ribs 903′ may be formed on a lower surface of the knockdown device 900′. The ribs 903′ protrude from the lower surface of the knockdown device 900′ such that when the knockdown device 900′ contacts the recording medium a surface area of the knockdown device 900′ that contacts the recording medium is less than a surface area of the knockdown device 900′ that contacts the recording medium when no ribs are provided. Therefore, a noise level caused by the knockdown device 900′ striking the recording medium can be reduced. The knockdown device 900′ may be made of plastic, for example.
The knockdown device 900′ may include surfaces which are chamfered, curbed, or angled in such a way to reduce a noise associated with rotating the knockdown in an upward and downward motion. For example, the body 901′, arms 902a′, 902b′, ribs 903′, or a combination thereof, may have curved surfaces.
As shown in
An operation of the knockdown device 900′ will now be described according to an example. When the recording medium is located on the register tray 520 the rotatable shaft 540 and paddles 531 may rotate in the forward direction. The rotatable shaft 540 and paddles 531 may rotate in the forward direction once or a plurality of times. The number of forward rotations may depend on a type of recording medium, an amount of ink on the recording medium, or a combination thereof, for example. For example, during the compiling of the recording medium, the controller 410 may transmit a signal to the driving source 430 to control the driving source 430 to rotate the rotatable shaft 540 in the forward direction a predetermined number of times.
The cams 541a′, 541b′ rotate together with rotation of the rotatable shaft 540. Therefore, the cams 541a′, 541b′ rotate a same number of times that the rotatable shaft 540 is rotated and a same number of times that the paddles rotate. Furthermore, because the knockdown device 900′ is actuated when the cams 541a′, 541b′ rotate, the knockdown device 900′ performs the knockdown of the recording medium a same number of times that the rotatable shaft 540 rotates. For example, if the paddles are rotated in the forward direction two times to compile a recording medium, the knockdown device 900′ is actuated two times by the cams 541a′, 541b′ such that the knockdown device 900′ is rotated and two knockdowns of the recording medium are performed. Likewise, if the paddles are rotated in the forward direction four times to compile a recording medium, four knockdowns of the recording medium are performed. For example, the knockdown device 900′ may contact the leading edge or front portion of the recording medium.
As another example, the controller 410 may determine no forward rotation of the rotatable shaft 540 is to be performed. For example, the controller 410 may determine, based on a type of recording medium for example, that the recording medium is unlikely to have a curl and therefore paddling by the paddles 531 and a knockdown by the knockdown device 900′ is not performed.
Actuation of the knockdown device 900′ is based on the rotation of the rotatable shaft 540 to drive the motion of the knockdown device 900′. The cams 541a′, 541b′ are coupled to the rotatable shaft 540 so as to control the timing of the knockdown actuation. The knockdown device 900′ can be activated such that rotation of the rotatable shaft 540 in the forward direction causes the knockdown device 900′ to rotate downward to apply a force to the recording medium once per cycle or once each rotation of the rotatable shaft 540. According to this operation, actuation of the knockdown device 900′ is dependent upon the number of forward paddles performed to compile media. For example, a number of times the knockdown device 900′ is actuated and the number of forward paddles performed to compile media may be the same such that there is a 1 to 1 relationship between the number of times the knockdown device 900′ is actuated and the number of forward paddles performed to compile media.
As another example, rotation of the knockdown device 900′ in the forward direction may be based on the rotation of the rotatable knockdown shafts 904a′, 904b′, which may be combined as a single shaft, to drive the motion of the knockdown device 900′. That is, a driving source, other than a driving source used to drive rotatable shaft 540, may be provided to drive rotation of the rotatable knockdown shaft and the knockdown device 900′.
The knockdown device 900′ is rotated to contact the recording medium and may be immediately rotated back upwards to the upper position to be stored in the recess 573′ of the upper paper guide 570′. The knockdown device 900′ may be lowered for a duration long enough to contact the recording medium and eliminate or reduce the curl in the recording medium, while also not delaying completion of the compiling and finishing operations unnecessarily. For example, for compiling of a recording medium during a single rotation of the rotatable shaft 540, the knockdown device 900′ may be in contact with the recording medium for a duration less than a duration that the paddles 531 are in contact with the recording medium. Minimizing or reducing a duration that the knockdown device 900′ is lowered also reduces a risk of the knockdown device 900′ interfering with operation of the tamper 560 and paddles 531 during compiling.
The knockdown device 900″ may be mounted to the upper paper guide 570″ in a manner similar to that described above with respect to knockdown device 900′. That is, except for the fact that arms 902a″, 902b″ are not joined together by a common body in contrast to the knockdown device 900′, the knockdown device 900″ may be considered to be similar in construction and operation in all other respects compared to knockdown device 900′ and therefore a detailed description thereof will not be repeated. However, because arms 902a′, 902b′ of knockdown device 900′ are joined together by the common body 903′, the arms 902a′, 902b′ of knockdown device 900′ may experience less torsion or twisting compared to the arms 902a″, 902b″ of knockdown device 900″ during rotation.
After the knockdown device completes the knockdown action on the recording medium, and the recording media have been compiled in the register tray 520, a finishing process can be performed on the recording media and the finished recording media can be discharged or ejected from the compiler 500 to the lower output bin 456 for retrieval by a user. For example, the stapler 510 (see
As discussed above, various knockdown devices for a finisher may be implemented to knock down a recording medium during a compiling process of the recording medium so as to flatten the recording medium and eliminate or decrease a curl in the recording medium. Reduction of the curl can improve a job quality of compiled media stacks, enable increased temperatures to be utilized in the image forming apparatus to remove moisture from a recording medium, and increase a stack capacity of the compiler in the finisher.
Executable instructions to perform processes or operations in accordance with the above-described examples may be recorded in a machine readable storage. A controller may execute the executable instructions to perform the processes or operations. Examples of instructions include both machine code, such as that produced by a compiler, and files containing higher level code that may be executed by the controller using an interpreter. The instructions may be executed by a processor or a plurality of processors included in the controller. The machine readable storage may be distributed among computer systems connected through a network and computer-readable codes or instructions may be stored and executed in a decentralized manner.
The foregoing examples are merely examples and are not to be construed as limiting the disclosure. The disclosure can be readily applied to other types of apparatuses. Also, the description of the examples of the disclosure is intended to be illustrative, and not to limit the scope of the claims.
Filing Document | Filing Date | Country | Kind |
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PCT/US2018/032282 | 5/11/2018 | WO |
Publishing Document | Publishing Date | Country | Kind |
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WO2019/216913 | 11/14/2019 | WO | A |
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