TW202243918A - System and method for replacing and cleaning a stencil in a stencil printer - Google Patents

Abstract

Systems and methods of removing and cleaning a stencil in a stencil printer include removing a used stencil from a stencil printer with the assistance of a movable cart, transporting the used stencil by the movable cart to a cleaning station, removing the used stencil from the movable cart, delivering the used stencil to the cleaning station, cleaning the stencil, removing a cleaned stencil from the cleaning station, and delivering the cleaned stencil to the movable cart for future use.

Description

System and method for changing and cleaning stencils in a stencil printing machine

CROSS-REFERENCE TO RELATED APPLICATIONS: This application asserts under the patent law co-pending U.S. Provisional Patent Application Ser. METHOD FOR REPLACING AND CLEANING A STENCIL IN A STENCIL PRINTER), filed January 12, 2021), which is hereby incorporated by reference in its entirety for all purposes.

This application relates generally to stencil printers and related methods of printing viscous materials (e.g., solder paste) on electronic substrates (e.g., printed circuit boards (PCBs)), and more particularly to applications for replacement and cleaning Systems and methods for a stencil in a stencil printer.

In the manufacture of surface mount printed circuit boards, a stencil printer may be used to print solder paste onto the circuit board. Typically, a circuit board with a pattern of pads or some other conductive surface on which solder paste will be deposited is automatically fed into a stencil printer; Known as "fiducials") are used to properly align the board with the stencil or screen of the stencil printer prior to printing solder paste onto the board. In some systems, an optical alignment system including a vision system is used to align the circuit board to the stencil.

Once the board has been properly aligned with the stencil in the printer, the board is lifted onto the stencil, solder paste is dispensed onto the stencil, and a squeegee (or squeegee) is passed through the stencil to force the solder paste through the stencil. holes and onto the circuit board. As the squeegee moves across the stencil, the solder paste tends to roll in front of the blade, which ideally causes mixing and shearing of the solder paste to achieve the desired viscosity, which facilitates filling the holes in the screen or stencil. Solder paste is usually dispensed onto the stencil from standard cartridges. The stencil is then separated from the board, and adhesion between the board and the solder paste results in most of the material remaining on the board. Residual material on the surface of the stencil is removed during a cleaning process before additional circuit boards are printed.

Another procedure in the printing of circuit boards involves inspecting the circuit board after solder paste has been deposited on the surface of the circuit board. Inspection of circuit boards is important in determining whether clean electrical connections can be made. Too much solder paste can cause a short, while too little solder paste in place can prevent electrical contact. Generally speaking, the visual inspection system is further utilized to perform two-dimensional or three-dimensional inspection of the solder paste on the circuit board.

Current stencil printers require manual intervention to perform routine operations. For example, during changeovers, operators must perform many manual tasks (eg, changing stencils, changing solder paste cartridges, changing squeegee blades, and changing support tools). Each of these tasks requires an operator to manually perform the task. For example, with most stencil printing machines, the operator must unlock the stencil, remove the stencil, properly insert the replacement stencil, and lock the replacement stencil in place. Changeover operations may take up to 30 minutes during which time the stencil printer is not operating, which may result in a non-operational PCB production line.

One aspect of the present disclosure relates to a method of removing and cleaning a stencil in a stencil printing press. In one embodiment, the method comprises the steps of: removing the used stencil from the stencil printing machine with the aid of a movable cart; transporting the used stencil by the movable cart to a cleaning station; Removing used stencils from a moving cart; transporting used stencils to a cleaning station; cleaning the stencils; removing cleaned stencils from the cleaning station; and transporting cleaned stencils to a movable cart for future use .

Embodiments of the method may further comprise: performing the method without human intervention. The method can be performed on at least two stencil printers. The movable cart can be configured to transport other items including: a tray configured to support scraper blades and implements. The movable cart may include an interface configured to interact with a docking station associated with the stencil printer and the cleaning station. The movable cart may comprise at least one pin received in at least one guide associated with the stencil printer and the cleaning station to connect the movable cart with the stencil printer and the cleaning station, respectively aligned to fully interface with at least one delivery device. The method may further comprise the step of: identifying the item by obtaining an image of the item and verifying whether the item is the correct item based on the predetermined identification mark.

Another aspect of the present disclosure relates to a system for removing and cleaning stencils in a stencil printing press. In one embodiment, the system includes: a stencil printer with a removable stencil, a cleaning station, and a cart that is movable and configured to remove the used stencil from the stencil printer, remove the used stencil Cart transport to cleaning station, used stencil removal from movable cart, used stencil transfer to cleaning station, cleaned stencil removal from cleaning station, and cleaned stencil transfer to movable pusher car for future use.

Embodiments of the system may further include: a solder paste pan configured to support excess solder paste. The system may further comprise: at least one additional stencil printer. The movable cart may be configured to transport other items including a tray configured to support scraper blades and implements. The movable cart may include an interface configured to interact with a docking station associated with the stencil printer and a docking station associated with the cleaning station. The movable cart may comprise at least one pin received in at least one guide associated with the stencil printing press and at least one guide associated with the cleaning station to be fully connected to the movable cart Prior to cart docking, align the movable cart with the stencil printer and cleaning station, respectively. The movable cart may include an imager for identifying an item by obtaining an image of the item and verifying that the item is the correct item based on a predetermined identification mark.

Yet another aspect of the present disclosure relates to a method of recovering solder paste from a stencil printer. In one embodiment, the method comprises the steps of: removing excess solder paste from the stencil printer with the aid of a movable cart; transporting the excess solder paste to a solder paste recycling station by the movable cart; Remove excess solder paste from the removable cart; transport excess solder paste to a solder paste recycling station; store excess solder paste for future use.

Embodiments of the method may further comprise the step of: containing excess solder paste within the solder paste tray. The movable cart may include an interface configured to interact with a docking station associated with the stencil printer and the solder paste recycling station. The movable cart may comprise at least one pin received within at least one guide associated with the stencil printer and the solder paste recycling bin to connect the movable cart to the stencil printer, respectively aligned with the cleaning station to fully interface with the at least one conveyor. The method may further comprise the step of: identifying the item by obtaining an image of the item and verifying whether the item is the correct item based on the predetermined identification mark.

Another aspect of the present disclosure relates to a system for recycling solder paste from a stencil printer. In one embodiment, the system includes: a stencil printer, a solder paste recycling station, and a movable cart configured to remove excess solder paste from the stencil printer, transport excess solder paste to a solder paste recycling station, removes excess solder paste from a movable cart; and transports excess solder paste to a solder paste recycling station.

Embodiments of the system may further comprise the step of: containing excess solder paste within the solder paste tray. The system may further comprise: at least one additional stencil printer. The movable cart may be configured to transport other items including stencils and trays configured to support scraper blades and tools. The movable cart may include an interface configured to interact with a docking station associated with the stencil printer and a docking station associated with the solder paste recycling station. The movable cart may comprise at least one pin received within at least one guide associated with the stencil printer and at least one guide associated with the solder paste recycler to be completely connected to the Prior to docking the movable cart, align the movable cart with the stencil printer and the solder paste recycler, respectively. The movable cart may include an imager for identifying an item by obtaining an image of the item and verifying that the item is the correct item based on a predetermined identification mark.

The present disclosure relates generally to material application machines (referred to herein as "stencil printers," "screen printers," "printing machines," or "printers"). printers)"), and are utilized in surface mount technology (SMT) processing lines and are configured to apply assembly materials (e.g., solder paste, conductive ink, or encapsulation materials) to substrates (e.g., printed circuit boards (in this Known as "electronic substrate", "circuit board", "board", "PCB", "PCB substrate", substrate, or PCB (PCB board))) or other equipment that performs other operations (eg, inspection, rework, or placement of electronic components on a substrate)). In particular, embodiments of the present disclosure are described hereinafter with reference to a stencil printer used to produce printed circuit boards.

For purposes of illustration only, and not limitation of generality, the present disclosure will now be described in detail with reference to the accompanying drawings. The disclosure is not limited in its application to the details of construction and arrangement of elements set forth in the following description or illustrated in the drawings. The principles set forth in this disclosure can be applied to other embodiments and can be practiced or carried out in various ways. Also, the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting. Any reference to an example, embodiment, component, element, or act of systems and methods mentioned herein in the singular may also encompass the plural, and any reference herein to any embodiment in the plural Any reference to a component, element or act may also encompass only a single embodiment. References in singular or plural are not intended to limit the presently disclosed systems or methods, their components, acts, or elements. As used herein, "including," "comprising," "having," "containing," "involving," and variations thereof, are intended to encompass the following listed items and their equivalents, as well as additional items. References to "or" may be construed inclusively such that any term described using "or" may mean any of a single, more than one, and all of the described terms. In addition, in the event of inconsistent term usage between this document and a document incorporated by reference, the term usage in the incorporated reference is in addition to that of this document; for irreconcilable inconsistencies , subject to the usage of the term in this article.

For purposes of illustration, embodiments of the present disclosure will now be described with reference to a stencil printer for printing assembly material (eg, solder paste) onto a circuit board. However, those skilled in the art will appreciate that embodiments of the present disclosure are not limited to stencil printers for printing solder paste onto circuit boards, but may be used in applications where other adhesive assembly materials (e.g., glues and sealants) need to be dispensed. ) for other applications. For example, the device can be used to print: Epoxy resins used as underfills for wafer-level packaging. Furthermore, stencil printers according to embodiments of the present disclosure are not limited to those for printing assembly materials on circuit boards, but include those for printing other materials on various substrates (eg, semiconductor wafers) . Furthermore, the terms screen and stencil are used interchangeably herein to describe the device in a printer that defines a pattern to be printed on a substrate. In certain embodiments, the stencil printer may comprise a Momentum® or Edison™ series of stencil printer platforms offered by ITW Electronic Assembly Equipment, Inc. of Hopkinton, MA. An exemplary stencil printer is indicated generally at 5 in FIG. 1 . In this embodiment, the stencil printer 5 is a Momentum® series of stencil printer platforms offered by ITW Electronic Assembly Equipment, Inc. of Hopkinton, MA.

Referring to FIG. 2 , a stencil printer of an embodiment of the present disclosure is indicated generally at 10 . As shown, the stencil printer 10 includes a frame 12 that supports the elements of the stencil printer. The elements of a stencil printer may include, in part, a controller 14, a display 16, a stencil 18, and a printhead or printhead assembly (generally indicated at 20) configured to utilize Solder paste is applied in the manner described in more detail below.

As shown in FIG. 2 and described hereinafter, the stencil and printhead assemblies may be suitably coupled or otherwise connected to frame 12 . In one embodiment, printhead assembly 20 may be mounted on a printhead assembly stand 22 , which may be mounted on frame 12 . The printhead assembly stage 22 enables the printhead assembly 20 to move in the y-axis direction under the control of the controller 14 and applies pressure to the printhead assembly as it engages the stencil 18 . In a certain embodiment, printhead assembly 20 may be placed on stencil 18 and lowered in the z-axis direction to contact and sealingly engage the stencil.

The stencil printer 10 may also include a conveyor system having tracks (not shown) for placing printed circuit boards (sometimes referred to herein as "printed wiring boards", "substrates") ", or "electronic substrate (electronic substrate)") to the printing position in the stencil printer. The rails, which may sometimes be referred to herein as a "tractor feed mechanism," are configured to feed, load, or otherwise transport circuit boards into the work area of the stencil printer (which is located in the may be referred to herein as a "print nest"), and removing the circuit board from the print nest.

Referring additionally to FIG. 3 , the stencil printer 10 has a support assembly 28 to support a circuit board 29 (shown in phantom), which raises and secures the circuit board so that it is stable during printing operations. In some embodiments, the substrate support assembly 28 may further include: a specific substrate support system (e.g., a solid support, a plurality of pins, or a flexible tool) that rests on the circuit board when it is in the printing position. below. The substrate support system may be used, in part, to support interior regions of the circuit board to prevent the circuit board from bending or warping during printing operations.

In one embodiment, printhead assembly 20 may be configured to receive solder paste from a source, such as a dispenser (eg, a solder paste cartridge), that provides solder paste to the printhead assembly during a printing operation. Other methods of providing solder paste can be utilized instead of the cartridge. For example, solder paste may be manually deposited between the blades (or manually from an external source). Additionally, in certain embodiments, the controller 14 may be configured for use with a personal computer having an appropriate operating system (e.g., Microsoft Windows® operating system provided by Microsoft Corporation) with application-specific software to control the template Operation of the printing press 10 . Controller 14 may be networked with a master controller for controlling a production line for manufacturing circuit boards.

In one configuration, stencil printer 10 operates as follows. The circuit board 29 is loaded into the stencil printer 10 using a transfer track. The support assembly 28 raises and secures the circuit board 29 in the printing position. The printhead assembly 20 is then lowered in the z-axis direction until the blades of the printhead assembly contact the stencil 18 at the desired pressure. Then, the printhead assembly 20 is moved across the stencil 18 in the y-axis direction by the printhead assembly stage 22 . Printhead assembly 20 deposits solder paste onto circuit board 29 through holes in stencil 18 . Once the printhead assembly is fully passed through the stencil 18 across the aperture, the printhead assembly is lifted off the stencil and the circuit board 29 is lowered back onto the transport track. The circuit board 29 is released and transported from the stencil printer 10 so that a second circuit board can be loaded into the stencil printer. To print on the second circuit board 29, the printhead assembly is lowered in the z-axis direction into contact with the stencil and moved across the stencil 18 in the opposite direction to that used for the first circuit board.

For the purpose of aligning the stencil 18 with the circuit board 29 prior to printing and inspecting the circuit board after printing, an imaging system 30 may be provided. In one embodiment, imaging system 30 may be disposed between template 18 and support assembly 28 that supports the circuit board thereon. Imaging system 30 is coupled to imaging gantry 32 for moving the imaging system. In one embodiment, imaging gantry 32 may be coupled to frame 12 and include: beams extending between side rails of frame 12 to provide back and forth movement of imaging system 30 over circuit board 29 in the y-axis direction . The imaging gantry 32 may further comprise: a carriage device housing the imaging system 30 and configured to move along the length of the beam in the x-axis direction. The construction of imaging gantry 32 for mobile imaging system 30 is well known in the art of solder paste printing. This arrangement allows the imaging system 30 to be positioned anywhere below the reticle 18 and above the circuit board 29 to acquire images of predetermined areas of the circuit board or reticle, respectively.

After one or more applications of solder paste to the circuit board, excess solder paste may accumulate on the bottom of the stencil 18 and stencil wiper assembly (which is generally indicated at 34 ) and may move under the stencil to remove excess solder paste. In other embodiments, the stencil 18 may move over the stencil wiper assembly.

As mentioned above, stencil printers require manual intervention to perform certain component replacement and/or replenishment operations. For example, a typical template needs to be replaced after a certain period of time (eg, four hours). Furthermore, the templates need to be changed for individual production runs. Furthermore, solder paste cartridges (which supply temperature-controlled solder paste to the stencil printer) need to be replaced over time (eg, in four hours or less). Separate production runs may require different solder paste materials. Another item that needs to be replaced periodically is the scraper blade, which wears out during use. Finally, when changing from one production product to another, the tools used to support the substrate in the printing position need to be replaced.

Referring to FIG. 4 , a method of replacing a template is indicated generally at 40 . A stencil is used to print solder paste onto the printed circuit board. Stencils are usually made of stainless steel or nickel. As shown, when a new template is requested at 41, whether for a new production run or due to wear and tear on an existing template, a clean template is taken from the template library at 42 and shipped at 43 To one of several stencil printers identified by "Printer 1", "Printer 2", and "Printer 3". A stencil printer can be part of a single production line, or part of multiple production lines, for manufacturing printed circuit boards. The number of stencil printers may vary. On the production line, "dirty" or used stencils are removed from the stencil printer and "clean" or new stencils are inserted into the stencil printer and secured for use. Dirty stencils are transported at 44 to a stencil cleaning station 45 where they are cleaned and ready for reuse. Once cleaning is complete, the stencils are shipped at 46 to a clean stencil store 42 where they are ready for reuse during the same or a different production run.

In one embodiment, a method of replacing reticles and/or items placed on a pallet may comprise the step of: When a new reticles and/or items on a pallet are requested, either for a new production run or due to existing reticles provide clean stencils and/or items on a removable cart. On the production line, "dirty" or used stencils and/or items are removed from the stencil printing press and "clean" or new stencils and/or items are inserted into the stencils from a movable cart Press and fixed for use. Dirty stencils and/or items are transported to a stencil cleaning station where the stencils and/or items are cleaned and ready for reuse. Once cleaned, the stencils and/or articles are transported back to the stencil printer or storage where they are ready for reuse during the same or a different production run.

Embodiments of the present disclosure relate to a conveyor system configured to automate a changeover procedure for a stencil printer and implement one or more of the methods described with reference to FIG. 4 . In one embodiment, the delivery system includes a movable cart configured to engage the stencil printer to supply and receive replacement and supplemental parts and materials to and from the stencil printer. For example, a stencil printer may include a docking station configured to receive a movable cart. The docking station may include an interface that enables the movable cart to communicate with the stencil printer. A single movable cart can be configured to contain: a conversion reticle and/or a replacement reticle. For example, during a changeover, the stencil printing press must be reconfigured to produce different items. Therefore, new stencils can be utilized in the stencil printing machine to produce different products.

The conversion procedure described herein can be accomplished with a single movable cart configured to replace and/or replenish each item. In other embodiments, more than one movable cart may be provided. For example, for reticle changing, the movable cart is configured to support a predetermined number of reticles. The movable cart and/or the stencil printer may be configured to identify stencils, store the stencils, transport the stencils to and from the stencil printer, inspect the stencils, and interface with the stencil printer. The movable cart may also be configured to retrieve used parts (eg, stencils) from the stencil printer.

Embodiments of the present disclosure also relate to a conveyor system configured to automate a replenishment procedure for a stencil printer. In one embodiment, the delivery system includes a movable cart configured to engage the stencil printer to supply and receive replacement and supplemental parts and materials to and from the stencil printer. For example, a stencil printer may include a docking station configured to receive a movable cart. The docking station may include an interface that enables the movable cart to communicate with the stencil printer. A single movable cart can be configured to contain: a conversion template and a replacement template.

The replenishment procedures described herein can be accomplished with a single movable cart configured to replenish replenishable items. In other embodiments, more than one movable cart may be provided. For example, for stencil replenishment, a movable cart is configured to support several replacement cartridges of solder paste. The movable cart and/or the stencil printer can be configured to identify replacement cartridges of solder paste, store the cartridges, transport the cartridges to and from the stencil printer, inspect the cartridges, And interface with the stencil printing machine.

Referring to FIG. 5 , in one embodiment, a mobile cart (generally indicated at 80 ) includes a frame or housing 82 configured to support replacement and/or supplementary items. As shown, frame 82 is generally rectangular and is supported on wheels or casters, each of which is indicated at 84 . In one embodiment, the movable cart 80 is configured to be manually moved by an operator by pushing on the housing 82 of the movable cart. In this embodiment, the movable cart 80 may be configured with push rods or handles. In another embodiment, the movable cart 80 is configured to be automatically controlled by remote control or by interacting with the movable cart, the stencil printer 10, the production line, and/or some other dedicated automation move. In this embodiment, the movable cart 80 may comprise: wheels driven by suitable motors and transmissions, and controls associated with the movable cart, the stencil printing machine 10, the production line, and/or some Other dedicated controls are configured to control the movable cart. The moveable cart 80 may further include one or more sensors and/or vision systems (eg, cameras) to guide the moveable cart from storage to, for example, a stencil printer.

The movable cart 80 includes one or more shelves, each indicated at 86 , configured to store items for the stencil printer 10 . For example, shelf 86 may be specifically designed to support new and used stencils, and/or other items (e.g., new and spent/used solder paste cartridges, new and used squeegee blades, and new and used tools). One or more shelves 86 may be configured to move vertically within housing 82 to a height suitable for operation with stencil printer 10 . Some shelves 86 may be designated as “clean shelves” to support clean or new items ready for use within the stencil printer 10 . Some shelves 86 may be designated as “dirty shelves” to support used items removed from the stencil printer 10 . The shelves 86 may be spaced a specific distance from each other to receive various items. For example, shelves 86 may be spaced 3/8" to 1½" apart from each other to accommodate the stencil frame thickness.

It should be understood that although the shelves are illustrated as being oriented horizontally, the shelves are arranged in a vertical orientation, wherein the stencils are inserted into and removed from the shelf slots in the vertical plane.

The movable cart 80 may be configured with one or more devices for transporting items from the movable cart to the stencil printer 10 and vice versa. For example, the device may include grippers or transport arms to facilitate removal and insertion of items (eg, templates) from the movable cart.

The movable cart 80 may be equipped with an interface designed to be docked in a docking station provided on the stencil printing machine 10 . In one embodiment, as illustrated in FIG. 5 , the movable cart 80 includes an interface 110 configured to communicate from both a mechanical interface and an electronic communication interface within a docking station 112 of the stencil printer 10 Make a docking. In certain embodiments, the movable cart 80 may be configured with a unique mechanical interface that matches the unique mechanical interface of the stencil printer 10 . The unique mechanical interface may include: Geometric features. In another embodiment, as illustrated in FIG. guides (each indicated at 116) to align the movable cart with the stencil printer prior to fully docking with the movable cart. Other types of guides may be used (eg, electrical/magnetic guides, visual guides, sensors, latches, etc.). The movable cart 80 may be physically engaged with the stencil printer when docked within the docking station of the stencil printer 10, or disengaged from the stencil printer.

Referring to Figure 6, the movable cart 80 may be particularly suitable for changing stencils (each stencil is indicated at 18) within the stencil printing machine 10. Rack 86 is configured to support stencils 18 that are shuttled into and out of stencil printer 10 . The shelf 86 can be configured to move in a vertical direction to achieve a desired height. Devices associated with the movable cart 80 may be configured to move the stencil 18 from the movable cart into and out of the stencil printing machine 10 once the stencil is at a desired height. Movement of the stencil 18 may be accomplished automatically under the control of a controller associated with the movable cart 80, the stencil printer 10, and/or the production line.

Referring to FIG. 7, in one embodiment, a mobile cart 80 includes wheels 84 driven by suitable motors and transmissions (indicated at 122), and controls (e.g., remote controls 124), It is configured to control the movement of the movable cart. The mobile cart 80 further includes a power source 126 (eg, a battery) to power the movement of the mobile cart via the motor and drive system 122 .

Referring to FIGS. 8 and 9 , the movable cart (indicated generally at 200 ) of an embodiment of the present disclosure is configured to be removed and replaced from a stencil printer ( FIG. 8 ), indicated generally at 205 . The stencil is removed and transported to a cleaning station indicated generally at 210 (FIG. 9). In one embodiment, cleaning station 210 is a stencil cleaning station; however, the cleaning station may be configured to clean any number of items (eg, doctor blades and implements supported in trays). As mentioned above, a stencil is used to print solder paste onto the printed circuit board. Stencils are usually made of stainless steel or nickel. When a request for a new stencil needs to be made, whether for a new production run or due to wear on an existing stencil, the clean stencil is transported by the movable cart 200 to the stencil printer 205 . A "dirty" or used stencil is removed from the stencil printer 205 and a "clean" or new stencil is inserted into the stencil printer and secured for use. Dirty stencils are removed from the stencil printer 205 and replaced with new stencils within the stencil printer. These functions can be performed by the mobile cart 200 . As shown in Figure 9, dirty stencils are transported to cleaning station 210 where they are cleaned and ready for reuse. The movable cart 200 can also perform this function. Once cleaned, the stencils may be transported by the movable cart 200 back to the stencil printer 205 or to a stencil store where the stencils are ready for reuse during the same or a different production run.

As with stencil printer 10 , each of stencil printer 205 and cleaning station 210 may be configured to include a docking station configured to accommodate movable cart 200 . The docking station may include an interface that enables the movable cart 200 to communicate with the stencil printer 205 and the cleaning station 210 . As mentioned above with reference to the movable cart 80, the movable cart 205 may be configured with a docking interface designed to be in a docking station provided on the stencil printing machine 205 and the cleaning station 210 Make a docking. This arrangement enables the movable cart 200 to be configured for docking within the docking station of the stencil printer 205 and cleaning station 210 from both a mechanical interface and an electronic communication interface. The movable cart 200 can be configured with a unique mechanical interface that mates with the unique mechanical interfaces of the stencil printer 205 and cleaning station 210 . Unique mechanical interfaces can include: Geometric features. Like movable cart 80, movable cart 200 can be configured with pins that can be received within guides associated with stencil printer 205 and cleaning station 210 to move the movable cart The cart is aligned with the stencil press and cleaning station while fully docking with the movable cart. Other types of guides may be used (eg, electrical/magnetic guides, visual guides, sensors, latches, etc.). The movable cart 200 can be physically engaged with the stencil printer and/or cleaning station, or with the stencil printer and/or cleaning station while parked within the docking station of the stencil printer 205 and/or the cleaning station 210. Station 210 apart.

After docking in the cleaning station 210, the movable cart 200 is configured to transport the used stencil(s) to the cleaning station for cleaning. Once cleaned, the movable cart 200 receives the cleaned stencil or reticles for future use.

Referring to FIG. 10 , cleaning station 210 may be configured to include a stencil flipper 220 integrated within the cleaning station. In one embodiment, the movable cart 200 is configured to receive, store, and transport stencils in a horizontal configuration or in a vertical configuration. Stencil flipper 220 is configured to orient the stencil within cleaning station 210 in a desired orientation.

In some embodiments, the movable cart 200 is configured to receive a tray configured to store other items (e.g., scrapers, tools, solder paste trays) into the cleaner at a desired location (e.g., ,horizontal position).

In some embodiments, an integrated stencil flipper 210 is provided to clean both sides of the stencil.

In some embodiments, the cleaning station 210 may be configured with special end effectors to manipulate the tray supporting the squeegee blade and tool, as well as the solder paste disc, to ensure thorough cleaning.

Referring to FIG. 11 , the cleaning station 210 may be configured to include: a stencil inverter 210 disposed in front of the cleaning station. In one embodiment, the mobile cart 200 is configured to receive, store, and transport reticles in a horizontal configuration. Stencil flipper 220 is configured to orient the stencils within cleaning station 210 in a desired orientation (eg, a vertical orientation).

In some embodiments, the stencil flipper 220 rotates the stencil from a horizontal position to a vertical position as the movable cart 200 approaches the cleaning station 210 . Cleaning takes place in a cleaning station 210 in a vertical position.

In some embodiments, the cleaning station 210 may be configured with special end effectors to manipulate the squeegee blades and tools, as well as the solder paste disc, to ensure thorough cleaning.

Referring to FIG. 12 , as the movable cart 200 approaches the cleaning station 210 , the robot arm 230 moves the template from the movable cart to the cleaning station in a horizontal or vertical direction for cleaning. In one embodiment, the robotic arm is configured as described in U.S. Patent Application Serial No. 16/897,493, entitled "AUTOMATED PRINTER ROBOTIC ARM," filed June 10, 2020. The disclosed robotic arm is similar, and this patent application is incorporated herein by reference and owned by Illinois Tool Works Inc., the assignee of the present invention.

In some embodiments, items supported by trays are cleaned in the same manner as templates. Robotic arm 230 removes tools and scraper blades from the tray and places them independently in cleaning station 210 .

In some embodiments, cleaning station 210 may be configured to include special end effectors on robotic arm 230 to manipulate squeegee blades, tools, and pads to ensure thorough cleaning.

In some embodiments, the cleaning station is an Aquastorm® series cleaning platform provided by ITW Electronic Assembly Equipment of Camdenton, Missouri.

In some embodiments, stencils and tool trays with scraper blades and/or tools are automatically loaded for blasting in cleaning system 210 .

In some embodiments, the cleaning station 210 is configured to completely clean and dry products loaded into the same or removable cart 200 .

In some embodiments, the movable cart 200 may be configured to retrieve solder paste from the stencil (as described below).

FIG. 13 illustrates exemplary items (eg, stencils, each indicated at 240 ) that may be stored on movable cart 200 and moved between stencil printer 205 and cleaning station 210 .

FIG. 14 illustrates exemplary items (eg, doctor blades, each indicated at 250 ) that may be stored on movable cart 200 and moved between stencil printer 205 and cleaning station 210 .

FIG. 15 illustrates exemplary items (eg, tool 260 ) that may be stored on movable cart 200 and moved between stencil printer 205 and cleaning station 210 .

In some embodiments, the movable cart 200 may be configured as part of a solder paste recovery or recovery system. The solder paste recovery system may include: a solder paste pan, which is sometimes referred to herein as a solder paste container or container. In one embodiment, the solder paste tray includes: a flat bottom wall, a rear wall, and two side walls. The solder paste contained in the solder paste tray is removed from the stencil printer 205 and saved for future use. The solder paste tray with recovered solder paste is configured to be moved from the stencil printer 205 onto a movable cart 200 . Once on the movable cart 200, the solder paste tray with recycled solder paste is transported to a recycling station configured to receive the solder paste tray and remove the solder paste from the solder paste tray for recycling.

Referring to FIG. 16 , in one embodiment, a method of recovering solder paste from a stencil printer is indicated generally at 300 . It is worthwhile to plan to replace excess solder paste (indicated by 302) on the stencil. Currently, excess solder paste is manually removed from the stencil and stored for future use. A system for automatically recovering excess solder paste may be found in U.S. Patent Application Serial No. 16/897,526, entitled "SOLDER PASTE BEAD RECOVERY SYSTEM AND METHOD," filed June 10, 2020 application), which is incorporated herein by reference and owned by Illinois Tool Works Inc., the assignee of the present invention. Solder paste recovered from a stencil printer (eg, stencil printer 205 ) is deposited on a tray. As shown, the movable cart (for example, movable cart 200) is transported at 304 to the printer designated by "Printer 1", "Printer 2" in FIG. ", and one of several stencil printers identified by "Printer 3". The stencil printer may be part of a single production line, or part of multiple production lines, for the manufacture of printed circuit boards. The number of stencil printers may vary. The movable cart is docked to the designated stencil printing press in the manner described above. After docking, the recovered solder paste (on the tray) is removed from the stencil printer and transferred to a movable cart. The recycled solder paste (on trays) is transported at 306 to a solder paste recycling station 308 by a movable cart. Solder paste can be saved for future use. Recovered solder paste may be transported back onto the movable cart at 310 where the process begins anew.

Referring to FIG. 17 , a system for recovering excess solder paste is indicated generally at 400 . As shown, the system 400 includes a solder paste tray 410 that essentially acts as a tray to hold excess solder paste left on the stencil.

In some embodiments, the pad of solder paste 410 is processed (eg, the pad of solder paste is cleaned therein) through an EVT cleaner. Solder paste pad 410 may have an intact bead of solder paste, or residue from a previous transfer, cleaned in a manner similar to the cleaning of the stencil described above.

In some embodiments, the solder paste recovery system and related methods can be performed under the control of a controller. In particular, the controller can be configured to know when to perform a solder reclamation procedure.

In some embodiments, the stencil printer is configured to move trays of solder paste into and out of the stencil printer to a movable cart. In one embodiment, a printhead assembly (eg, printhead assembly 20 of stencil printer 10 ) may be configured to move and shuttle solder paste trays to a solder paste recycling station.

In some embodiments, the movable cart includes a controller adapted to control operation of the movable cart based on operating parameters obtained by the controller. The controller may be configured to communicate with the controller of the stencil printing press and the controller of the cleaning station, and/or a controller associated with the production line. In one embodiment with multiple movable carts, the controller may be embodied as a plurality of controllers provided in each movable cart, the controllers being concatenated via a Controller Area Network (CAN) platoons or other types of networks to communicate with each other. In other embodiments, a master controller may be provided to control the operation of the controller of the movable cart. Each movable cart may be provided with a display operatively coupled to the controller. The display is adapted to display operating parameters of the movable cart (eg, but not limited to: number of clean and used stencils or items provided on the tray). A suitable monitor can be provided to obtain this information. As an alternative or in addition to the embodiments described above, the operating parameters may be displayed on displays provided in the stencil printing press and cleaning station, and/or on displays associated with the production line.

In other embodiments, the movable cart may be controlled by a controller of the stencil printing machine, a cleaning station, and/or a controller associated with the production line. The controller may be: a controller dedicated to one or more movable carts.

In some embodiments, material identification for items on a movable cart may include a device to manipulate the items and a scanner to scan and identify the items. In one embodiment, barcodes for identifying items may be implemented. For example, barcodes may include: 1D scanners for UPC codes, 2D scanners for QRC codes, printed labels applied to items, or laser etched labels etched onto items. In another embodiment, an RFID system to identify items may be implemented. For example, an RFID system may include an RFID tag applied to an item and an RFID reader associated with a movable cart. With an RFID system, no line of site between the reader and the item is required. Furthermore, no scanning is required to identify all items within the movable cart. In another embodiment, an imaging or vision system to identify items may be implemented. The vision system may be an imaging system similar to imaging system 30 associated with stencil printer 10, and may be associated on-board, off-board, or on a movable cart.

In some embodiments, a database is provided to track items stored on the movable cart. In one embodiment, the database may comprise an open application (App) framework and be configured to push data to a stencil printer. The movable cart may be configured to communicate with the stencil printing press to push/pull material to the stencil printing press and/or production line, or may be configured to communicate directly with the production line. The database can contain: job information or material information. The database can further communicate with a Manufacturing Execution System (MES) associated with the production line, the stencil printer, or both. MES systems can be configured to know what materials are required for a production run. The movable cart can be configured to communicate with the MES system to coordinate the delivery of items to the stencil printing press.

The database can further be configured to retrieve information about items based on identification (eg, barcode number). In one embodiment, a central management system may be provided wherein the stencil printers, cleaning stations, and/or movable carts are programmed to accept material from the movable carts. The movable cart is programmed to update the database identifying the material on the movable cart, loading information from the network into the database associated with the movable cart and/or the stencil printer, wherein the The network is connected back to the MES system.

The database can further be configured to store additional information (eg, usage and consumption). A database can be configured to store information locally or remotely, and can be configured to store data associated with one or more production runs. For example, the database may be configured to obtain and store data including, but not limited to, traceability of stencils and/or pallets.

Libraries can be configured to share forecast data when replacement/replenishment is required. For example, the database may be configured to perform one or more operations with respect to storing information related to templates and/or pallets. The library can be configured to share forecast data for other replaceable/consumable items (eg, for templates and/or pallets).

The database can be configured to store data associated with lot traceability. Furthermore, mechanical keying of RFID or boards or a stencil frame of the stencil is provided to ensure: correct alignment/orientation/direction/front to back/top to bottom when inserting such items into the stencil printer. This information can be used to verify proper orientation and/or fit prior to shipping the item from the warehouse and/or prior to installing the item on a stencil printer. Low-cost readers can perform this function.

Referring back to FIG. 7 , in one embodiment, the remote control 124 can be configured to communicate with the database 130 through the cloud 132 or ISP to provide the functions described above. In another embodiment, library 130 may be part of a computerized control system for a stencil printing machine, cleaning station, or mobile cart or production line.

In some embodiments, a movable cart may be configured to store materials. The movable cart can be configured to be flexible to accommodate where the material is coming from and where it is being delivered. Additionally, the movable cart may be configured to identify where a particular material is located on the movable cart. In certain embodiments, the location is remote, local, on a movable cart, and/or on a stencil printing press, whether by automated or manual transport.

In some embodiments, the movable cart may be configured to perform inventory control. In particular, the movable cart can be configured to identify where material is located, how much material is used, how and when material is used, link materials and information related to materials with customer inventory control systems, and track each The type of material consumed by the board or the batch size of the board.

In some embodiments, the removable cart can be configured to organize items stored on the removable cart. As mentioned above, in one embodiment, a movable cart may be provided to store, transport, and transport multiple resources (including but not limited to: stencils and/or trays). In another embodiment, the movable cart may be configured to store, transport, and transport individual resources or items to a stencil printer and/or cleaning station. For example, a movable cart may be configured to store multiple reticles and/or trays. The mobile cart can be configured to serve multiple production lines. In another embodiment, the movable cart may be configured to service a stencil printer.

In some embodiments, the movable cart may be configured to transport items from the movable cart to the stencil printing press and from the stencil printing press to the movable cart, and it is contemplated that the movable cart The height difference from the stencil printing machine. Shipping can be automatic or manual. In one embodiment, the movable cart may be moved by automated guided vehicle (AVG) technology or remote control associated with the movable cart. In another embodiment, the movable cart can be configured to move autonomously. In another embodiment, the movable cart may be configured to be moved manually. In yet another embodiment, the movable cart may be configured to automatically and/or manually move items stored on the movable cart. For example, a movable cart may be configured to automatically move items, and may provide interruptions to pre-planned activities in which items are manually moved.

In some embodiments, the timing associated with performing the transport function of the movable cart can be programmed to account for shift changes (e.g., personnel shifts), scheduled maintenance, on-demand activities (e.g., recipe changes) , and predicted events (instant replacement). Sequences can be programmed to meet multiple production line balance control requirements (with one or more movable carts) and to meet immediate on-demand material supply requirements on the production line.

In some embodiments, the movable cart is configured to perform inspections. For example, a movable cart can inspect items on and off the cart (including stencils and/or trays). In one embodiment, a vision system associated with the movable cart may be configured to obtain an image of the item. A vision system coupled with a controller can be configured to inspect for cleanliness, damage, wear, and identify readability (eg, whether a barcode label is worn, dirty, or torn). Vision systems can embody any type of 2D, 3D, or color camera.

In some embodiments, the movable cart is configured to interface with the stencil printer from a mechanical interface and an electronic communication interface. In one embodiment, the movable cart may be configured with a unique mechanical interface that mates with the unique mechanical interface of the stencil printer and the unique mechanical interface of the cleaning station. Unique mechanical interfaces can be geometric features. In another embodiment, the movable cart may be configured with pins that are received in guides associated with the stencil printing press to decouple the movable cart before fully docking with the movable cart. The cart is aligned with the stencil printing machine. Similarly, the cleaning station may include guides to align the movable cart with the cleaning station. The pins and guides can be reversed where the pins are provided on the stencil printing press and/or cleaning station and the guides are provided on the movable cart. Other types of guides may be used (eg, electrical/magnetic guides, visual guides, sensors, latches, etc.).

In some embodiments, the interface and docking station may be configured with a clamping system to hold the movable cart in place relative to the stencil printer and cleaning station. For example, a magnetic clamping system may be employed.

In some embodiments, the stencil printer and/or cleaning station may be configured with multiple docking stations (eg, five docking stations). The docking station may be located in front of the stencil printing press and/or cleaning station, or behind the stencil printing press and/or cleaning station.

The movable cart and/or the stencil printer, and/or the cleaning station can be configured to verify that the movable cart can dock and interface with the stencil printer and/or the cleaning station. In one embodiment, verification may be provided to confirm that the movable cart is in place and ready to interface with the stencil printer and/or cleaning station. This verification process can further determine whether there is the correct material on the movable cart, and whether the movable cart material information can be received from the MES system or identified locally. If incorrect, the moveable cart may be configured to activate an alarm and/or alert the operator if there is wrong or damaged material on the moveable cart.

In some embodiments, the movable cart may be configured with an actuating device or actuator to move items into and out of the movable cart after it is docked to the stencil printer and/or cleaning station . Embodiments of the actuator may be implemented on a movable cart, a stencil printer, and/or a cleaning station. In another embodiment, items may be manually loaded and unloaded from the movable cart.

In some embodiments, a movable cart may be configured to interface with a production line. Using this embodiment, the operator of the production line can confirm the correct position and confirm receipt of the movable cart on the stencil printing press and/or cleaning station.

In some embodiments, the movable cart can be configured to communicate with stencil printers, cleaning stations, production lines, and/or select machines within a production line via an open platform. Communication systems may include: wired systems, wireless systems (via a common network, mesh, Bluetooth, Wi-Fi, Zigbee, WAN, Nodes, Li-Fi, etc.), a combination of wired and wireless systems, and Infrared (IR) system.

In some embodiments, the mobile cart can be configured with a dedicated power source. In one embodiment, the mobile cart includes a battery configured to be disposed on the mobile cart (e.g., the mechanism used to move stencils and/or trays into and out of the mobile cart) The automation components in the power supply. In other embodiments, the mobile cart can be configured with an uninterruptible power supply. The power supply can be configured to support drive when "docked" (high voltage from the stencil printer when docked, otherwise low voltage when not docked). The power source may be configured to recharge for autonomous operation (eg, recharge the battery from power provided by the stencil printer).

In some embodiments, the movable cart may be configured to operate with a stencil printer. For example, the movable cart may be configured to provide a handshake function with the stencil printer 10 prior to delivering the item (eg, please give me stencil #1234). The movable cart and stencil printer can be configured with communication protocols and/or library references as to which can be consumed. The movable cart can be configured to determine if the movable cart has the correct items. The handshaking function can be configured to ensure correct delivery of items (eg, here's stencil #1234 (here's stencil #1234)), and/or subsequent delivery of items (eg, subsequent delivery of items (eg, "I now Has stencil #1234(I now have stencil #1234)")). In one embodiment, the nomadic device may be configured to scan and identify items in a movable cart and determine, for example, whether the items are ready for use, need cleaning, and the like.

In some embodiments, the movable cart may be configured to account for errors associated with handling and recycling items in the movable cart. For example, a movable cart can be configured to detect incomplete motion by a party, incomplete delivery of items (e.g., jammed or jammed items), stalled delivery (I pass template #1234 to you (I passed stencil #1234 to you, don't you have it?)), and manual intervention or overrides (e.g., here, let me help you ). In one embodiment, a controller associated with a movable cart may be configured to perform electrostatic discharge control, data recovery, and/or security.

In some embodiments, the movable cart may be configured with higher height capabilities. In addition to indexing all equipment to the correct height, the movable cart needs to pull in/out all equipment to attach to the machine table.

In some embodiments, existing machine gantry, rails, and print heads of the stencil printer can be configured to shuttle items in and out.

In some embodiments, the movable cart may be configured to communicate with the stencil printing press, production line, and warehouse associated with the production line.

In some embodiments, the movable cart can be configured with an electrical/pneumatic interface.

In some embodiments, the removable cart can be configured to track consumables—new and used (e.g., stencils and/or trays) on the movable cart (where the tracked data includes location, temperature, and other information)).

In some embodiments, the movable cart may be configured to store and supply reticles and/or items on pallets during a production run.

In some embodiments, the movable cart can be configured to scan all consumables with an appropriate scanning device (eg, barcode reader or RFID reader).

In some embodiments, the movable cart can be configured with an indexing mechanism to properly locate consumables.

In some embodiments, the moveable cart may be configured with a bypass switch to disconnect the moveable cart from the stencil printer 10 in the event of a problem with the moveable cart.

In some embodiments, the movable cart may be configured to be moved manually or by an automated guided vehicle (AGV).

In some embodiments, the movable cart may be configured to dock and interface with a stencil printer.

In some embodiments, the movable cart can be configured to service multiple stencil printers.

In some embodiments, a movable cart may be configured to be dedicated to one consumable (eg, a stencil, or multiple consumable/conversion items).

In some embodiments, the movable cart can be configured to transport and present consumables to be cleaned at a remote station.

In some embodiments, the movable cart may be configured to be refilled at a storage depot associated with the warehouse.

In some embodiments, the movable cart can be configured for active or passive climate control.

In some embodiments, the mobile cart can be configured to be controlled by an application (App) that can be used for smartphone integration.

As used herein, "automated" or "fully automated" transitions describe the replacement or replenishment of items without human intervention.

As used herein, a "partially automated" transformation describes the replacement or replenishment of items with some or limited human intervention.

As used herein, "transport" or "transporting" describes the moving of an item from one location to another, either manually or with a machine.

As used herein, "install" or "installing" describes the process of placing an item in a ready-to-use location.

As mentioned above, the movable cart can be used to change other items within the stencil printing press. For example, a stencil wiper assembly contains consumables (eg, paper and solvents) that can be automatically replaced by a movable cart.

The concepts disclosed herein can be applied to other types of equipment used to manufacture electronic substrates, including dispensers, pick and place machines, reflow ovens, wave soldering machines, selective soldering machines, inspection stations, and cleaning stations. For example, the concept for replacing cartridges of solder paste can be employed in dispensers for dispensing viscous materials. In another example, concepts involving changing tools can be used in dispensers and pick-and-place machines for mounting electronic components onto electronic substrates. In another example, concepts involving replacement items can be used to replace solder in wave soldering and optional soldering machines, and cleaning products in cleaning stations.

Having thus described several aspects of at least one embodiment, it is to be appreciated various alterations, modifications, and improvements will readily occur to those skilled in the art. Such alterations, modifications, and improvements are intended to be part of this disclosure, and are intended to be within the scope of this disclosure. Accordingly, the foregoing description and drawings are by way of example only.

5: Stencil printing machine 10: Stencil printing machine 12: frame 14: Controller 16: Display 18: template 20:Print head assembly 22:Print head assembly stand 28: Support components 29: circuit board 30: Imaging system 32: Imaging gantry 34: bottom 40: method 41: Step 42: step 43: step 44: step 45: step 46: step 80: Movable cart 82: frame 84: wheels 86: shelf 114: pin 116: guide 122: Motors and transmission systems 124: remote control 126: power supply 130: database 132: cloud 200: Movable cart 205: Stencil printing machine 210: cleaning station 220: Template flipper 230: Mechanical arm 240: template 250: scraper blade 260: Tools 300: method 302: Step 304: step 306: Step 308: Step 310: step 400: system 410: solder paste tray

The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical element that is illustrated in various figures is represented by a like numeral. For purposes of clarity, not every element may be labeled in every drawing. In the schema:

Fig. 1 is a front view of a stencil printing machine.

Figure 2 is a front perspective view of the stencil printing machine.

Figure 3 is a top plan view of the stencil printer illustrated in Figure 2 with several parts removed.

FIG. 4 is a diagram showing a method of exchanging a stencil in a stencil printing machine.

FIG. 5 is a schematic illustration of a movable cart in proximity to a stencil printer, according to an embodiment of the present disclosure.

6 is a schematic illustration of a movable cart configured to deliver stencils to and receive stencils from a stencil printer.

7 is a schematic illustration of a movable cart configured to deliver items to and receive items from a stencil printer.

Figure 8 is a perspective view of a movable cart positioned adjacent to a stencil printing press in accordance with one embodiment of the present disclosure.

Figure 9 is a perspective view of a movable cart positioned adjacent to the stencil cleaner.

Figure 10 is a perspective view of the mobile cart and stencil cleaner with a stencil inverter shown schematically integrated in the stencil cleaner.

Figure 11 is a perspective view of the mobile cart and stencil cleaner with the stencil inverter shown disposed in front of the stencil cleaner.

Figure 12 is a perspective view of the movable cart and stencil cleaner with the robotic arm shown disposed adjacent to the stencil cleaner.

Figure 13 is a perspective view of stencils stacked on top of each other.

Figure 14 is a perspective view of a doctor blade.

Figure 15 is a perspective view of the tool.

FIG. 16 is a diagram showing a method of recovering solder paste from a stencil printer.

Figure 17 is a perspective view of a solder paste recovery system including a solder paste tray.

Domestic deposit information (please note in order of depositor, date, and number) none Overseas storage information (please note in order of storage country, institution, date, and number) none

200: Movable cart

205: Stencil printing machine

Claims (26)

A method of removing and cleaning a stencil in a stencil printing press, the method comprising the steps of: removing a used stencil from a stencil printing machine with the aid of a movable cart; transporting the used stencil to a cleaning station by the movable cart; remove the used stencil from the movable cart; transporting the used stencil to the cleaning station; clean the template; removing a cleaned stencil from the cleaning station; The cleaned stencil is transported to the mobile cart for future use. The method of claim 1, wherein the method is performed without human intervention. The method as claimed in claim 1, wherein the method is executed on at least two stencil printing machines. The method of claim 1, wherein the movable cart is configured to carry other items including: a tray configured to support scraper blades and implements. The method of claim 4, wherein the movable cart includes an interface configured to interact with a docking station associated with the stencil printer and the cleaning station. The method of claim 4, wherein the movable cart comprises at least one pin received within at least one guide associated with the stencil printing press and the cleaning station to respectively The movable cart is aligned with the stencil printer and the cleaning station to fully interface with the at least one conveyor. The method as claimed in claim 1, further comprising the step of: identifying the item by obtaining an image of the item and verifying whether the item is the correct item based on a predetermined identification mark. A system for removing and cleaning a stencil in a stencil printing press, the system comprising: a stencil printing machine having a removable stencil; a cleaning station; and A mobile cart configured to: taking out a used stencil from a stencil printing machine, transport the used stencil to the cleaning station, remove the used stencil from the movable cart, conveying the used stencil to the cleaning station, remove a cleaned stencil from the cleaning station, and The cleaned stencil is transported to the mobile cart for future use. The system of claim 8, wherein the system further comprises: a solder paste tray configured to support excess solder paste. The system as claimed in claim 8, further comprising: at least one additional stencil printer. The system of claim 8, wherein the movable cart is configured to carry other items including: a tray configured to support scraper blades and implements. The system of claim 8, wherein the movable cart comprises: an interface configured to interact with a docking station associated with the stencil printer and a docking station associated with the cleaning station. The system of claim 8, wherein the movable cart comprises: at least one pin received in at least one guide associated with the stencil printing press and at least one guide associated with the cleaning station A guide to align the movable cart with the stencil printer and cleaning station, respectively, before fully docking with the movable cart. The system of claim 8, wherein the movable cart includes: an imager for verifying that the item is correct by obtaining an image of the item and based on a predetermined identification mark item to identify the item. A method of recovering solder paste from a stencil printer, the method comprising the steps of: removing excess solder paste from a stencil printer with the help of a movable cart; transporting the excess solder paste to a solder paste recycling station by the movable trolley; removing the excess solder paste from the movable cart; convey the excess solder paste to the solder paste recycling station; and Store this excess solder paste for future use. The method of claim 15, wherein the excess solder paste is contained in a solder paste tray. The method of claim 15, wherein the movable cart comprises: an interface configured to interact with a docking station associated with the stencil printer and the solder paste recycling station. The method of claim 15, wherein the movable cart comprises: at least one pin received within at least one guide associated with the stencil printer and the solder paste recycling bin to The movable cart is aligned with the stencil printer and the solder paste recycling station, respectively, to fully interface with the at least one conveyor. The method as recited in claim 15, further comprising the step of: identifying the item by obtaining an image of the item and verifying whether the item is the correct item based on a predetermined identification mark. A system for recovering solder paste from a stencil printer, the system comprising: a stencil printing machine; a solder paste recycling station; and A mobile cart configured to: removing excess solder paste from the stencil printer; Ship the excess solder paste to the solder paste recycle bin; remove the excess solder paste from the movable cart; and Send this excess solder paste to the solder paste recycle bin. The system of claim 20, wherein the excess solder paste is contained in a solder paste tray. The system of claim 20, further comprising: at least one additional stencil printer. The system of claim 20, wherein the movable cart is configured to transport other items including: stencils and a tray configured to support scraper blades and implements. The system of claim 20, wherein the movable cart comprises: an interface configured to interact with a docking station associated with the stencil printer and a docking station associated with the solder paste recycling station effect. The system of claim 20, wherein the movable cart comprises: at least one pin received in at least one guide associated with the stencil printer and associated with the solder paste recycling bin to align the movable cart with the stencil printer and the solder paste recycling station, respectively, prior to fully docking with the movable cart. The system of claim 20, wherein the movable cart includes: an imager for verifying that the item is correct by obtaining an image of the item and based on a predetermined identification mark item to identify the item.

Images