WO1995026126A1 - Automated gasket applicator and method of using same - Google Patents
Automated gasket applicator and method of using same Download PDFInfo
- Publication number
- WO1995026126A1 WO1995026126A1 PCT/US1994/014645 US9414645W WO9526126A1 WO 1995026126 A1 WO1995026126 A1 WO 1995026126A1 US 9414645 W US9414645 W US 9414645W WO 9526126 A1 WO9526126 A1 WO 9526126A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- strip
- substrate
- gasket
- applying
- application
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/0015—Gaskets or seals
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
- Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
- Y10T156/1062—Prior to assembly
- Y10T156/1075—Prior to assembly of plural laminae from single stock and assembling to each other or to additional lamina
- Y10T156/1077—Applying plural cut laminae to single face of additional lamina
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/12—Surface bonding means and/or assembly means with cutting, punching, piercing, severing or tearing
- Y10T156/1317—Means feeding plural workpieces to be joined
- Y10T156/1322—Severing before bonding or assembling of parts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/17—Surface bonding means and/or assemblymeans with work feeding or handling means
- Y10T156/1702—For plural parts or plural areas of single part
- Y10T156/1705—Lamina transferred to base from adhered flexible web or sheet type carrier
Definitions
- the present invention pert ⁇ . .s to a method anduß apparatus for applying gasket strips to a surface. More particularly, the invention relates to an automated system 5 using a robot guided head to manufacture gasket patterns, and is particularly suitable for applying gasket strips to circuit boards, covers, fixtures, cases components, etc.
- Electronic circuit boards may require some type of
- the shielding can protect the circuits on a circuit board from signals generated from sources outside the circuit board, or protect components and circuits outside the circuit board from signals generated on the
- 25 gasket is typically compressed between the circuit board and a metal cover or case.
- a shielding gasket to a circuit board, cover, or case.
- the first utilizes a molded gasket of the desired shape which " 30 is either glued in place, pressed onto a ridge (like a saddle), pressed onto a groove or channel, or uses the circuit board bolts to keep from shifting during use.
- Another method uses die-cut gasket patterns, but this is very expensive due to the high material waste.
- Another method for shielding circuits is to place beryllium copper clips or pegs onto a cover that makes contact with the circuit board. These, however, are labor intensive, costly to redesign, and difficult to put on.
- An innovative method of applying gasket material that eliminates these shortcomings is desirable.
- Gasket strips are also used in other industries. For example, automotive gaskets are used for sealing various engine parts to maintain gas and liquids, and in areas such as windshields to seal the environment from the car's interior.
- One device as disclosed in U.S. patent 4,759,810 to Jackson et al. applies precut lengths of gasket strips to a windshield. Because the gasket material must be precut, and an operator must load precut rolls of gasket in the device, it is not easily adaptable to different gasket patterns. Moreover, the device lays down a one piece continuous length of gasket to form the entire gasket pattern. This is not suitable for making complicated gasket patterns that may require many individual strips.
- one object of the present invention is to provide a method and apparatus for applying gaskets that is less labor intensive.
- Another object is to provide a method and apparatus for applying gaskets that is less expensive.
- a further object of the invention is to provide a method and apparatus for applying gaskets that minimizes the gasket material required.
- Another object of the invention is to provide an automated method and apparatus for forming complicated patterns of gasket strips.
- Another object is to provide an automated method and apparatus capable of making different patterns of gaskets.
- FIG. 1 is an elevational view of a gasket device for applying gasket strips directly to a circuit board;
- FIG. 2 is an enlarged view of the cutting mechanism shown in FIG. 1;
- FIG. 3 is an enlarged view of the floating head shown in FIG. 1;
- FIG. 4 is an enlarged view of gasket material of FIG. l applied to the circuit board;
- FIG. 5A is an exploded view of a gasket device for applying gasket strips to a transfer substrate
- FIG. 5B is an enlarged view of an application shoe shown in Figure 5A;
- FIG. 6 is a schematic frontal view of the vacuum shoe in FIG. 5;
- FIG. 7 is a schematic view showing the path of the gasket strip through the device shown in FIG. 5;
- FIG. 8 is a perspective view showing how the gasket pattern created by the device of FIG. 5 is applied to a vacuum fixture;
- FIG. 9 is a perspective view showing the decal method of applying the gasket created by the device of FIG. 5 to a circuit board or cover;
- FIG. 10 is an elevational view of another gasket device for applying gasket strips directly to a circuit board.
- FIG. 11 is an enlarged view of the cutting assembly shown in FIG. 10; and FIG. 12 is an enlarged view of the application shoe shown in FIG. 10.
- the present invention provides a unique automated method and apparatus for applying gasket strips to a substrate, such as a circuit board, to form gasket patterns.
- the present invention directs a robot with a controller to apply the gasket strip to the substrate.
- the robot is then moved to advance a length of strip onto the substrate, the advancing strip being guided onto the substrate in the desired position.
- the controller actuates the cutting of the strip to the desired length.
- the present invention further provides an apparatus having a robot for controlling the position of the gasket strip relative to the substrate.
- a controller directs the robot.
- An application head, attached to the robot, has an application shoe for applying the strip to the substrate.
- a cutting assembly attached to the application head cuts the strip to the desired length.
- the invention disclosed herein is a novel automated method and apparatus for applying strips of material to a substrate, a substrate being any surface for receiving strips of material.
- the embodiments described below are particularly suited for applying strips of EMI gasket material to a substrate to create a gasket pattern.
- the substrate can be the circuit board itself, or a transfer carrier which is then used to transfer the completed gasket pattern onto the circuit board or the shield cover. It is understood, however, that the present invention can be adapted to apply other types of strip material to other types of substrates.
- FIGS. 1, 2, 3, and 4 show the present invention incorporated in a gasket application device 10 for applying a gasket strip 12 directly to a circuit board 14.
- the circuit board 14 is supported securely on a work surface 16.
- the device applies as many lengths of gasket strips, in as many locations as required, to create the final gasket pattern.
- the gasket application device 10 has a controllable gantry 18.
- the robot can be any type of suitable robot arm or gantry capable of movement in multiple dimensions, preferably in the horizontal X and Y axes, and the vertical Z axis, relative to the work surface 16. Movement in the horizontal rotary axis is also desirable.
- a preferred robot for the present embodiment is a gantry style robot, such as those available from several manufacturers, one being Techno-Isel located in New Hyde Park, New York.
- Directing the movement of gantry 18 to create the desired gasket pattern is a programmable controller 19.
- the gasket pattern is programmed into the controller, which then directs the various movements and functions of the device to lay the strips of gasket material onto the substrate.
- Such devices may include various commercially available devices, such as microprocessors, digital computers, and other control apparatus.
- An application head 20 is adapted to removably attach to and be moved by the gantry 18 as directed by the controller 19. Attached to the application head 20 are the necessary items and equipment to support and guide the gasket strip to the substrate for the specific application, i.e., applying gasket strips directly to a circuit board. As is explained below, different type application heads can be attached to the gantry 18 for different type applications.
- the application head 20 has a mounting frame 22 used as a platform for supporting the other items including the gasket strip 12 to be applied. It is preferably made out of metal for strength and rigidity, such as a simple flat piece of aluminum, although any suitable material can be used.
- the head 20 can attach directly to the gantry 18, or by an adapter plate 24 as shown.
- a payoff spool hub 26 is rotatably attached to the mounting frame 22. It is designed for holding a payoff spool 28 of gasket material, and is preferably made of plastic such as Delrin*, a trademark of E. I. duPont de Nemours, Inc. of Wilmington, DE, to minimize weight.
- the hub 26 may have spring-loaded ball plungers allowing the spool 28 to snap on and off. It is preferable that the spool 28 not freely spin as the gasket strip advances, although a free spinning spool may be useful in different applications.
- the hub 26 spins on a mechanical adjustable clutch mechanism that tensions the hub 26 and prevents free spinning. Such clutches are readily available from companies such as Custom Products of North Haven, Connecticut.
- An alternate method of tensioning the hub 26 is to connect the hub to a direct current motor wired to rotate the hub in a direction opposite the direction the hub rotates when letting out gasket material. Keeping the voltage low prevents the hub from actually rotating in reverse, but does apply enough back-tension to prevent free spinning.
- the spool 28 holds a continuous wound length of gasket strip 12.
- the spool can be a single row pancake-style spool, or the type having several level wound rows of gasket strip to achieve longer lengths.
- the spool 28 is also preferably made of plastic or other relatively strong and light material to minimize weight.
- one side 30 of the gasket strip has an adhesive for permanently adhering to the circuit board.
- a release backer strip 32 covers the adhesive side 30 to prevent the gasket strip from sticking to itself in the spool.
- a suitable type of release backer is a polymer strip, such as MYLAR polymer available from E. I. duPont de Nemours and Company, having a silicon release coating to permit easy removal from the adhesive.
- a second side 34 of the gasket strip contains no adhesive.
- a floating head 36 Attached to the bottom of the mounting frame 22 is a floating head 36, which can move up and down relative to the frame 22.
- a compression spring 37 or similar device provides a biasing force downwards to return the floating head 36 to its normal position after the floating head 36 has moved.
- An application shoe 38 applies or lays down the gasket strip 12 onto the circuit board 14 and is positioned on the bottom of the floating head 36.
- the shoe 38 comprises a shouldered application idler roller 39, the shoulders adapted for the size of the particular gasket strip being used.
- the idler roller 39 rotates freely on the gasket strip 12 as the strip is advanced and laid onto the circuit board 14. It is understood that the idler roller can comprise a wheel or similar device capable of guiding or laying down the strip material onto the substrate.
- the gasket strip advancing from the payoff spool 28 to the application idler roller 39 is guided by double idler rollers 42a, 42b, cutting idler roller 44, idler roller 46 on the top of the floating head 36, and take up idler roller 48.
- idler rollers are preferably free spinning and "shouldered" to maintain proper gasket strip alignment.
- the release backing 32 is peeled from the gasket strip 12 as it advances past the take up idler roller 48.
- a take-up spool 50 snapped onto take up hub 52, rotates to collect the release-backer 32.
- Both the take-up spool 50 and hub 52 are preferably made of plastic or similar lightweight material.
- the take-up hub 52 is driven by a motor 54 for rotating the spool 50.
- the motor is a direct current (DC) motor controlled from a variable DC power supply to control the torque, and hence, the peeling strength of the motor for peeling the release backer 32 from the gasket strip 12.
- DC direct current
- the voltage should normally be set so that the peeling strength is high enough to peel the release backing at idler roller 48, but not high enough to overcome the tension in hub 26 preventing the free spinning of payoff spool 28.
- Other type motors can be used, such as a stepper motor controlled by the controller 19 which can be moved the precise amount necessary to take u the release backer 32.
- the cutting assembly 56 is mounted on the application head 20 to cut the gasket strip 28 to the desired length.
- the assembly 56 has a cutting blade 58 attached to a pneumatic cylinder 60 that moves the blade into the gasket strip when actuated by the programmable controller 19.
- the blade 58 cuts the gasket strip 12 against the cutting idler roller 44 which is "shouldered” (i.e., has a channel 62 formed to the thickness of the release strip).
- the blade 58 wider than the shouldered channel, cuts only to the shoulder, cutting the gasket strip 12, but not the release backer 32.
- a sensor 64 is shown positioned along the path of the gasket strip 12 between the take-up idler roller 48 and the application idler roller 39.
- the sensor provides feedback to the controller 19 as to whether or not it detects a gasket strip 12. Any suitable sensor may be used, an optical sensor that registers gasket strip, but not the release backer being preferable.
- the controller Upon detecting the absence of a gasket strip, the controller causes the strip to advance to the application idler roller 39. This function will be further described below. Having described the structural elements of the present embodiment, its operation is now described with reference to FIGS. 1, 2, 3 and 4.
- a continuous length of EMI gasket strip 12 in the payoff spool 28 is advanced through the guide idler rollers to the application idler roller 39 as shown.
- the release backer 32 is peeled off at the take-up idler roller 48 and collected by the take up spool 50.
- a beginning lead end 66 of gasket strip 12 is positioned just below the application idler roller 39.
- the controller 19 positions the gantry 18 in the proper alignment and location for applying the next strip of gasket 12.
- the application head 20 is moved downward until the application idler roller 39 presses a lead end 66 on to the circuit board 14.
- the application head is then moved horizontally in the desired direction to "roll out” or “lay down” an advancing strip of gasket material past the idler roller onto the circuit board. It is understood that the application head 20 must be oriented as shown to lay out a gasket strip in direction 68. Because the gasket strip strongly adheres to the circuit board 14, additional gasket strip is pulled from the payoff spool 28. Controller 19 actuates the cutting mechanism 56 at the appropriate position.
- the controller causes the blade 58 to move into cutting idler roller 44 at the appropriate position to cut the strip.
- the application head continues to move until the complete length of gasket strip is rolled out onto the circuit board, its end 70 applied, with a new lead end 72 in position for the next application.
- the application head 20 is then lifted away from the circuit board and realigned and repositioned to apply the next strip of material. This process is repeated until the desired gasket pattern is applied.
- a beginning lead end 66 curved under the application idler roller 39 is necessary to begin each gasket strip application. It has been found that the clockwise bending of the gasket strip 12 around the idler roller 46 biases the strip to curve in the clockwise direction. Thus, once released from the release backing 32, the cut lead end 66 curves under the idler roller 39 as shown. If necessary, a small air nozzle 74 can direct air to push the lead end 66 under the application idler roller 39.
- the controller 19 causes the take up motor to rotate the take- up spool 50, pulling the release backer 32, and thereby advancing the gasket material. If the take-up motor is a DC motor, this is done by increasing the voltage to overcome the tension on the application hub 26 until the sensor 64 detects the gasket strip. It then switches back to lower voltage to maintain tension in the system.
- the gasket is advanced, however, only to the point where the sensor detects it.
- the strip must be further advanced the small distance between the point of detection by the sensor and the point below the application idler roller 39 necessary for starting a new application of gasket strip.
- One method of doing so is to decrease the distance between the frame 22 and the floating head 36 a predetermined amount, and then returning both to their normal position.
- the controller can move the application head 20 downward onto the substrate 14 to compress spring 37 a predetermined amount. It is seen that as the distance between the frame 22 and the floating head 36 decreases, slack is created in the entire length of gasket strip 12 and release backer 32 between the payoff spool 28 and the take-up spool 50. This slack is immediately taken up by the DC motor driven take up spool 50, thereby advancing the lead end 66 downward.
- the controller simply advances the motor the predetermined amount to position the lead end 66 below the application idler roller 39.
- the invention is thus capable of forming extremely complicated gasket patterns in a very short period of time. Different patterns can be created with a simple software program. The entire process leaves straight lengths of gasket to form a gasket pattern on a workpiece. Curves, including complete circles, may be made as well by simply rotating the gantry about its ⁇ axis in conjunction with movement in the X and Y axes while laying down the gasket strip. This process may be facilitated by modifying the application idler roller 39 by splitting it down its center to allow for independent movement of each of its edges.
- FIGS. 5, 6 and 7. A second embodiment incorporating the present invention is now described with reference to FIGS. 5, 6 and 7. Unlike the first embodiment, which applies the gasket strips directly to a circuit board, this embodiment applies the gasket strip first to an intermediate transfer substrate or carrier. Once the completed gasket pattern is formed on the carrier, the carrier is used to transfer the gasket to a circuit board, cover, or other substrate.
- This embodiment incorporates similar parts and elements as described in the other embodiment, and is readily understood when read in conjunction with them.
- FIGS. 5A, 5B, and 7 Shown in FIGS. 5A, 5B, and 7 is an application head 100 which is movable in the X, Y, Z, and ⁇ directions by gantry 102, as directed by controller 104.
- the application head 100 has a frame 106, and an adapter plate 107 for removably attaching to the gantry 102.
- a payoff spool hub 108 is rotatably attached to the frame 106 by frame arm 110, and is adapted to hold a payoff spool 112 of wound gasket strip 114.
- a tensioning clutch mechanism prevents the hub 108 from free spinning.
- gasket strip 114 is a gasket material having an adhesive side 116 covered by a release backing 118, and a non adhesive side 120.
- Attached to the bottom of the frame 106 is the floating head 122.
- the slide assembly 124 shown comprises a linear bearing, although any suitable slide assembly may be used.
- the application shoe 126 is fixed to the bottom of the floating head 122.
- the application shoe may be held in place through use of any suitable mechanism, such as a spring- loaded ball plunger 127a that mounts into an inside detent hole or groove 127b on vacuum post 127c.
- An O-ring I27d is provided on the post 127c to prevent vacuum loss.
- the shoe 126 comprises a vacuum shoe 128 having a channel 130 cut wide and deep enough to accommodate the gasket strip 114. Located in the top of the channel 130 are small openings 132 connected to a vacuum system 134 through a vacuum air hose 136.
- a vacuum is applied to keep the gasket strip 114 secured within the shoe 126 when the strip is not being applied, and released to allow the gasket strip to travel through the channel 130 when the gasket strip 114 is being applied to the substrate 152.
- Air may be blown through the vacuum holes 132 when the vacuum is off to help the gasket strip slide through the channel on a layer of air.
- the guide for the gasket strip 114 between the payoff spool 112 and the vacuum shoe 128 comprises upper idler roller 138, a lower idler roller 139, and a take-up idler roller 142. These idler rollers are preferably free spinning and shouldered.
- the take-up spool 144 removably mounted on the take- up hub 140, collects the release backer 118 peeled at take- up idler roller 142.
- the hub 140 preferably has a motor, such as a DC or stepper type, to drive the take-up spool 144.
- the cutting assembly 146 preferably consists of a replaceable cutting blade 148 mounted to the frame 106 with a small compression spring that allows the blade to shift to adjust for out of flatness tolerances in the substrate. It is seen that as the application head 100 is moved downward onto the work table 150, the floating head 122, already in contact with the substrate at the vacuum shoe 128, slides on the linear bearing of slide assembly 124. This allows the frame 106 to continue moving downward, thereby moving the cutting blade 148 downward until it cuts through the gasket strip on the substrate.
- An optical sensor 154 is illustrated in FIG. 5 for signaling the controller when the gasket strip in the payoff spool 112 is depleted.
- the sensor 154 "looks" through the slotted opening 156 in the side of c e spool.
- a continuous length of gasket strip 114 on the payoff spool 112 is advanced past the guide idler rollers 138, 139, and take-up idler roller 142, to the vacuum shoe 128 as shown.
- the release backer 118 is peeled off the gasket strip 114 around the take-up roller 142 and re-wound onto the take-up spool 144.
- the gasket strips are applied by the application head 100 onto a carrier 152, a suitable carrier being a piece of release-coated sheet material (e.g., siliconized polyester film) large enough to hold the particular gasket pattern being made.
- a vacuum work table 150 applies a vacuum through the table to hold the carrier firmly in place. Dowel pins or other alignment mechanism can be used to assure registry of the carrier.
- the application process begins by orienting the application head 100 over a substrate in the desired position for a gasket strip to be applied.
- the lead end 158 of the strip is securely held by the vacuum applied in vacuum shoe 128.
- the lead end 158 is then applied to the carrier by simply moving the application head 100 downward until the gasket contacts the carrier 152, the gasket's adhesive side adhering to the carrier.
- the vacuum in the vacuum shoe 128 is then released, and replaced with pressurized air to assist in sliding the gasket strip over the shoe 128.
- the entire application head 100 is then moved in the desired horizontal direction to lay down the strip of gasket, it being understood that the application head 100 must be oriented properly as shown to lay down a gasket strip in a particular direction 159.
- the gasket strip already laid onto the carrier pulls additional gasket strip from the payoff spool 112, through the guide idler rollers, and onto the carrier 152.
- the take-up spool 144 collects the release backer 118 peeled away from the gasket materia l at take-up idler roller 142.
- the entire head 100 descends further to allow the blade 148 to cut the gasket strip.
- the air pressure applied to the vacuum shoe 128 is shut off, and a vacuum is again drawn to secure the next lead end in the shoe.
- the application head 100 is next lifted from the carrier until the shoe 126 and gasket strip 114 clear the carrier 152 and the gasket strip is applied to the carrier.
- the head 100 is then repositioned at the next starting point to lay down another strip of gasket. This process is repeated until the gasket pattern is completed. Once the gasket is laid down on the carrier, it must be transferred onto the circuit board or shield cover.
- One method is shown in FIG. 8 utilizing a vacuum fixture 160.
- the vacuum fixture 160 can be a flat aluminum or plastic plate which has a channel configuration 162 to mate with gasket pattern 164 on carrier 152.
- the bottom of the channel 162 contains multiple small holes 165 connected via a plenum to a vacuum hose 166 through which a vacuum is drawn to hold the gasket securely in the channel.
- the gasket is transferred by laying the carrier 152 onto the fixture 160 so that the gasket 164 lays in the channel 162.
- the vacuum in the channel 162 is applied, and the carrier 152 is peeled away from the gasket 164, exposing the gasket's adhesive.
- the circuit board, cover, or other substrate is then laid on top of the fixture 160, the vacuum to the channel 162 is removed, and the tenacious adhesive on the gasket strip 164 sticks to the substrate.
- the adhesive does not stick as aggressively to the carrier since the carrier 152 has a silicon release coating, permitting easy removal.
- This method is used primarily when there are components on the circuit board or cover where the surface area on the fixture 160 may be relieved or channelled to accommodate them as shown (e.g., recessed area 163). Registration holes can be used to align the gasket with the circuit board, cover, fixture, or other substrate.
- another method of transfer is preferred for its simplicity and cost-effectiveness.
- a tacky-backer transfer sheet 170 is laid on top of gasket pattern 172, sandwiching the gasket 172 between the transfer sheet 170 and the carrier 152. Because the transfer sheet 170 contains a tacky adhesive, the carrier 152 (with its silicon release coating) can be easily peeled away from the gasket 172 to expose the gasket adhesive. A cover or circuit board 176 is then pressed against the adhesive side of the gasket 152.
- punch-cut holes 178 in the transfer sheet 170 may be added to act as a reference guide for aligning with the cover or circuit board dowel pins 180 or other alignment device.
- the punch cut holes can be formed with a pneumatic punch cylinder mounted to the frame 106 or similar device.
- Another possible mounting method may comprise a decal method, such as that described in co- pending U. S. patent application Serial Number 07/870,747 filed April 10, 1992, incorporated by reference.
- FIGS. 10, 11 and 12 A third embodiment, also for applying a gasket strip directly to a circuit board, is shown in FIGS. 10, 11 and 12. Similar in design and function to the first and second embodiments, it is readily understood when read in conjunction with the previously described embodiments.
- An application head 200 has a frame 202, an adapter plate 204 to connect to a gantry 205, and a payoff spool 206 mounted on the hub 208.
- An application shoe 220 has a shouldered free-spinning idler roller 222 mounted with the compression spring 224 so that it may freely float up and down to absorb any out-of- flatness tolerances in the substrate, the substrate being a circuit board in this particular example.
- the gasket strip 216 is pulled from the payoff spool 206 to the application idler roller 222 by a tacky backer strip 226.
- the tacky backer 226 is a strip of tape, such as conventional plastic adhesive tape, having a sticky side for adhering to the gasket strip 216. It is slit to a similar width as the gasket strip.
- a spool 228 of the tacky backer 226 is mounted on a tensioned hub 230. The sticky side of the tacky backer 226 is lightly pressed against the non-adhesive side of the gasket strip 216 through a combining mechanism, such as shouldered idler roller 218 and shouldered idler roller 232.
- idler roller 218 also acts as the take-up idler roller for the release backer 214 covering the adhesive side of the gasket strip.
- the release backer is removed after the tacky backer 226 is combined so that the adhesive side of the gasket strip does not stick to idler roller 218.
- a tacky backer take-up spool 234, mounted on the hub 236, is driven by a motor, preferably a DC motor controlled by a variable voltage power supply, for applying enough torque to collect the tacky backer.
- the shouldered idler roller 242 having a shoulder depth equal to the thickness of the tacky backer 226, allows the gasket strip to be cut while leaving the tacky backer uncut. This cutting action may be performed several times, leaving different pre-cut length sections of gasket attached to the tacky backer as needed.
- the application head 200 is brought down until the application idler roller 222 presses the leading end 243 of the gasket strip onto the circuit board 244.
- the entire application head is then moved in the appropriate direction 246 to lay down the gasket strip.
- the advancing gasket strip creates slack in the tacky backer tape which is taken up by the motor driven take-up spool 234 as it peels away from the strip at the idler roller 222.
- the applied strip is ended by actuating the cutting mechanism 238 at the appropriate point of travel, and advancing the application head until the end of the strip 248 attaches to the substrate.
- the application head 200 is then lifted and repositioned to start its next run before new lead end 243 for the next strip application has made contact.
- the present invention may be used to apply a wide variety of gasket materials.
- electrically conductive gaskets e.g., EMI gaskets
- thermally conductive gaskets e.g., thermally conductive gaskets
- environmental gaskets e.g., environmental gaskets
- chemically resistant gaskets e.g., chemically resistant gaskets
- the gaskets may be held in place with a wide variety of adhesive materials, such as electrically and/or thermally conductive adhesives, thermo-set adhesives, pressure sensitive adhesives, etc.
- the application head for the three embodiments described can be stationary, while the gantry controls the movement of the substrate relative to the application head to form the gasket pattern.
- capstan drives may be incorporated to more accurately feed gasket material or drive the release or tacky backer materials.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU15531/95A AU673119B2 (en) | 1994-03-18 | 1994-12-13 | Automated gasket applicator and method of using same |
EP95907231A EP0699376A1 (en) | 1994-03-18 | 1994-12-13 | Automated gasket applicator and method of using same |
JP7524624A JPH08510711A (en) | 1994-03-18 | 1994-12-13 | Automated gasket applicator and method of use |
KR1019950705141A KR960702729A (en) | 1994-03-18 | 1994-12-13 | AUTOMATTED GASKET APPLICATOR AND METHOD OF USING SAME |
FI955477A FI955477A (en) | 1994-03-18 | 1995-11-14 | Automated seal attachment device and method of using it |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/215,124 US5536342A (en) | 1994-03-18 | 1994-03-18 | Automated gasket applicator and method of using same |
US08/215,124 | 1994-03-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995026126A1 true WO1995026126A1 (en) | 1995-09-28 |
Family
ID=22801762
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1994/014645 WO1995026126A1 (en) | 1994-03-18 | 1994-12-13 | Automated gasket applicator and method of using same |
Country Status (8)
Country | Link |
---|---|
US (1) | US5536342A (en) |
EP (1) | EP0699376A1 (en) |
JP (1) | JPH08510711A (en) |
KR (1) | KR960702729A (en) |
AU (1) | AU673119B2 (en) |
CA (1) | CA2159502A1 (en) |
FI (1) | FI955477A (en) |
WO (1) | WO1995026126A1 (en) |
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US6966879B2 (en) | 1998-04-20 | 2005-11-22 | Matsushita Electric Industrial Co., Ltd. | Noninvasive continuous blood pressure measuring apparatus and a method of noninvasively measuring continuous blood pressure |
EP2548828A1 (en) * | 2011-07-20 | 2013-01-23 | Mikron Berlin GmbH | Device and method for precise laying of a flat element with a double-sided adhesive tape comprising a masking tape |
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US5660380A (en) * | 1995-08-15 | 1997-08-26 | W. L. Gore & Associates, Inc. | Vacuum fixture and method for dimensioning and manipulating materials |
US5779830A (en) * | 1995-10-24 | 1998-07-14 | Truseal Technologies, Inc. | Flexible tape applicator and method of operation |
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US6615890B1 (en) * | 2000-06-09 | 2003-09-09 | Venture Tape Corp. | Tape applicator for glazing applications |
US6773537B2 (en) * | 2001-01-12 | 2004-08-10 | 3M Innovative Properties Company | Method for applying designs to a substrate |
US7093641B2 (en) * | 2001-03-05 | 2006-08-22 | Henkel Corporation | Robotic tape applicator and method |
US20050016671A1 (en) * | 2001-03-05 | 2005-01-27 | Sharp Terrance M. | Robotic tape applicator and method |
US6634401B2 (en) * | 2001-09-27 | 2003-10-21 | 3M Innovative Properties Company | Tape applicator and methods of applying tape to a surface |
US20030109946A1 (en) * | 2001-12-10 | 2003-06-12 | Erickson Leif O. | Computer-aided layout and application of tape |
US7093642B2 (en) * | 2002-03-05 | 2006-08-22 | Henkel Corporation | Systems and methods for a robotic tape applicator |
US20040042789A1 (en) * | 2002-08-30 | 2004-03-04 | Celanese Ventures Gmbh | Method and apparatus for transferring thin films from a source position to a target position |
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US7016262B2 (en) * | 2003-09-11 | 2006-03-21 | General Phosphorix, Llc | Seismic sensor |
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US20060022081A1 (en) * | 2004-07-30 | 2006-02-02 | Pemeas Gmbh | Cartridge and method for handling thin film membranes |
US7374625B2 (en) * | 2004-08-13 | 2008-05-20 | Henkel Corporation | Systems and methods for a robotic tape applicator |
JP4491823B2 (en) * | 2006-03-17 | 2010-06-30 | 日本ジッパーチュービング株式会社 | Method for manufacturing electromagnetic shielding gasket |
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Citations (1)
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DE9404291U1 (en) * | 1993-06-14 | 1994-06-16 | Emi Tec Elektronische Material | Housing that shields its interior from electromagnetic radiation |
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US4255218A (en) * | 1979-02-28 | 1981-03-10 | Minnesota Mining And Manufacturing Company | Method and apparatus for applying adhesive strip |
US4448626A (en) * | 1980-07-21 | 1984-05-15 | Haggar Company | Method and apparatus for applying a welt to a garment panel |
US4591402A (en) * | 1981-06-22 | 1986-05-27 | Ltv Aerospace And Defense Company | Apparatus and method for manufacturing composite structures |
US4588466A (en) * | 1983-04-08 | 1986-05-13 | Vektronics Manufacturing, Inc. | Tape laying method and apparatus |
JPS602570A (en) * | 1983-06-20 | 1985-01-08 | Dainippon Printing Co Ltd | Automatic sticking device for double-sided adhesive tape |
US4548493A (en) * | 1984-04-10 | 1985-10-22 | Mayfield William C | Mask transference and alignment apparatus |
US4557790A (en) * | 1984-07-12 | 1985-12-10 | Cincinnati Milacron Inc. | Tape laminator |
DE3500924A1 (en) * | 1985-01-12 | 1986-07-17 | Henkel KGaA, 4000 Düsseldorf | PLASTIC SEAL AND METHOD FOR PRODUCING THE SEAL |
US4759810A (en) * | 1987-05-01 | 1988-07-26 | Libbey-Owens-Ford Co. | Method and apparatus for applying a gasket to an object |
FR2623745B1 (en) * | 1987-11-26 | 1990-05-11 | Valois | PROCESS FOR THE MANUFACTURE OF FLEXIBLE JOINTS RESISTANT TO CHEMICAL AGENTS AND JOINTS THUS OBTAINED |
JPH01281247A (en) * | 1988-05-07 | 1989-11-13 | Shin Nippon Koki Kk | Controller for tape tension in automatic tape attaching device |
JPH0776068B2 (en) * | 1988-05-18 | 1995-08-16 | 新日本工機株式会社 | Automatic tape sticking device |
CA2016769A1 (en) * | 1989-05-24 | 1990-11-24 | Charles F. Lang | Composite emi shield having clean, highly conductive surfaces for conductive bonding |
US4978417A (en) * | 1989-07-17 | 1990-12-18 | Cincinnati Milacron Inc. | Composite tape laying machine having scrap removal and method |
US5106450A (en) * | 1990-12-20 | 1992-04-21 | International Business Machines Corporation | Dry film resist transport and lamination system for semiconductor wafers |
US5261996A (en) * | 1991-01-25 | 1993-11-16 | Minnesota Mining And Manufacturing Company | Guiding system for a vacuum wheel applicator |
AU672499B2 (en) * | 1993-06-14 | 1996-10-03 | Emi-Tec Elektronische Materialien Gmbh | A process for producing a casing providing a screen against electromagnetic radiation |
-
1994
- 1994-03-18 US US08/215,124 patent/US5536342A/en not_active Expired - Lifetime
- 1994-12-13 KR KR1019950705141A patent/KR960702729A/en not_active Application Discontinuation
- 1994-12-13 WO PCT/US1994/014645 patent/WO1995026126A1/en not_active Application Discontinuation
- 1994-12-13 CA CA002159502A patent/CA2159502A1/en not_active Abandoned
- 1994-12-13 JP JP7524624A patent/JPH08510711A/en active Pending
- 1994-12-13 AU AU15531/95A patent/AU673119B2/en not_active Ceased
- 1994-12-13 EP EP95907231A patent/EP0699376A1/en not_active Ceased
-
1995
- 1995-11-14 FI FI955477A patent/FI955477A/en unknown
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9404291U1 (en) * | 1993-06-14 | 1994-06-16 | Emi Tec Elektronische Material | Housing that shields its interior from electromagnetic radiation |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6966879B2 (en) | 1998-04-20 | 2005-11-22 | Matsushita Electric Industrial Co., Ltd. | Noninvasive continuous blood pressure measuring apparatus and a method of noninvasively measuring continuous blood pressure |
EP2548828A1 (en) * | 2011-07-20 | 2013-01-23 | Mikron Berlin GmbH | Device and method for precise laying of a flat element with a double-sided adhesive tape comprising a masking tape |
Also Published As
Publication number | Publication date |
---|---|
CA2159502A1 (en) | 1995-09-28 |
EP0699376A1 (en) | 1996-03-06 |
JPH08510711A (en) | 1996-11-12 |
US5536342A (en) | 1996-07-16 |
KR960702729A (en) | 1996-04-27 |
AU1553195A (en) | 1995-10-09 |
FI955477A0 (en) | 1995-11-14 |
AU673119B2 (en) | 1996-10-24 |
FI955477A (en) | 1995-11-14 |
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