US20050108872A1 - Apparatus and method for assembling electronic circuits - Google Patents

Apparatus and method for assembling electronic circuits Download PDF

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Publication number
US20050108872A1
US20050108872A1 US10/498,836 US49883604A US2005108872A1 US 20050108872 A1 US20050108872 A1 US 20050108872A1 US 49883604 A US49883604 A US 49883604A US 2005108872 A1 US2005108872 A1 US 2005108872A1
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US
United States
Prior art keywords
location
placing
circuit carrier
belt conveyor
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/498,836
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English (en)
Inventor
Willibald Konrath
Helmut Greiner
Klaus Scholl
Werner Horzer
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Ericsson AB
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Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE10162327A external-priority patent/DE10162327A1/de
Application filed by Individual filed Critical Individual
Assigned to MARCONI COMMUNICATIONS GMBH reassignment MARCONI COMMUNICATIONS GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HORZER, WERNER
Assigned to MARCONI COMMUNICATIONS GMBH reassignment MARCONI COMMUNICATIONS GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KONRATH, WILLIBALD
Assigned to MARCONI COMMUNICATIONS GMBH reassignment MARCONI COMMUNICATIONS GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GREINER, HELMUT
Assigned to MARCONI COMMUNICATIONS GMBH reassignment MARCONI COMMUNICATIONS GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCHOLL, KLAUS
Publication of US20050108872A1 publication Critical patent/US20050108872A1/en
Priority to US11/543,170 priority Critical patent/US7552529B2/en
Assigned to ERICSSON AB reassignment ERICSSON AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MARCONI COMMUNICATIONS GMBH (NOW KNOWN AS TELENT GMBH)
Abandoned legal-status Critical Current

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    • 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
    • H05K13/00—Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components
    • H05K13/04—Mounting of components, e.g. of leadless components
    • H05K13/046—Surface mounting
    • H05K13/0465—Surface mounting by soldering
    • 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
    • H05K13/00—Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components
    • H05K13/0061—Tools for holding the circuit boards during processing; handling transport of printed circuit boards
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
    • Y10T29/49128—Assembling formed circuit to base
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
    • Y10T29/4913—Assembling to base an electrical component, e.g., capacitor, etc.
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
    • Y10T29/4913—Assembling to base an electrical component, e.g., capacitor, etc.
    • Y10T29/49131—Assembling to base an electrical component, e.g., capacitor, etc. by utilizing optical sighting device
    • 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
    • Y10T29/00—Metal working
    • Y10T29/51—Plural diverse manufacturing apparatus including means for metal shaping or assembling
    • Y10T29/5196—Multiple station with conveyor
    • 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
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53039—Means to assemble or disassemble with control means energized in response to activator stimulated by condition sensor
    • Y10T29/53048—Multiple station assembly or disassembly apparatus
    • Y10T29/53052—Multiple station assembly or disassembly apparatus including position sensor
    • 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
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/5313—Means to assemble electrical device
    • Y10T29/53174—Means to fasten electrical component to wiring board, base, or substrate
    • Y10T29/53178—Chip component
    • 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
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/5313—Means to assemble electrical device
    • Y10T29/53187—Multiple station assembly apparatus
    • 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
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/5313—Means to assemble electrical device
    • Y10T29/532—Conductor

Definitions

  • the present invention relates to an apparatus and a method for automated assembly of electronic circuits.
  • program controlled placing devices are used which are capable of taking a circuit component from a stack and inserting it at a given position of a circuit board.
  • the circuit board is heated together with the components placed on it in order to melt solder and to bring the circuit components into contact with conductors of the circuit board.
  • the process steps of placing and heating are carried out by different devices which, for a completely automated operation, must comprise internal conveyor means which receive a circuit board to be processed at an input of the device, and convey it to a processing location where the circuit board is packed with the components or the components are soldered, respectively, and further to an output of the device.
  • These internal conveying means are often formed with conveyor belts. At a transition from one device to another, these conveyor belts are generally butt jointed, so that a circuit board which is delivered by a conveyor belt of the placing device may slide across the joint onto the conveyor belt of the soldering device and may be further transported by it. Lateral guide rails ensure that the circuit board arrives on the conveyor belt of the soldering device exactly in a correct orientation.
  • the object of the present invention is to provide an apparatus for assembling electronic circuits which is suitable for manufacturing electronic circuits with well reproducible technical properties, in particular for assembling circuit components on a board with a positioning accuracy in a range of +50 mm, as required for radio frequency circuits.
  • the inventors have found that in current assembling devices an essential reason for the deviations of the soldered circuit components from their intended position is the hand-over of the circuit board from the conveyor means of the placing device to those of the soldering device. If the conveyor means of these two devices are not exactly parallel, there is an abrupt change of direction at the hand-over of the circuit board which may cause the circuit components to slip. The same applies if the planes in which the conveyor means support the circuit boards have slightly different heights or are not exactly parallel. Also, small differences in the conveying speeds may cause abrupt movements of the circuit board during hand-over.
  • a first sensor for detecting a passage of a circuit board is located at the conveyor belt, and a control device connected to this sensor brakes the conveyor belt with a predefined velocity profile after detection of the passage of a circuit board, in order to bring the circuit board to rest at a predefined location.
  • a second sensor is advantageously located at the conveyor belt at the location where the circuit board should come to rest; it allows for a post-correction of the speed profile in order to compensate inaccuracies of speed control.
  • fixing of the circuit components on the circuit board is carried out by soldering.
  • a solder oven employed for this purpose should preferably be evacuable in order to prevent the formation of cavities in the solder layer which might impair the behaviour of radio frequency components.
  • a parking area for a dummy circuit board is preferably provided in the movement range of the manipulator so that the manipulator may fill the solder oven with the dummy if not all places present in it are occupied by circuit boards.
  • Another possibility of fixing circuit components on the board is to use a heat-sealing film placed between the board and the circuit components.
  • a heat-sealing film placed between the board and the circuit components.
  • only a heatable plate is required on which the circuit board having the components placed on it may be put by the manipulator.
  • the placing station is preferably enclosed in a casing having an opening through which the conveyor belt emerges.
  • a continuous conveyor belt extends from a pick-up location at the input of the placing station to its output or, as described above, to a take-over location, where a circuit board may be taken over by the manipulator of the fixing station, there is a problem in that a new circuit board without components may not straightforwardly be loaded onto the conveyor belt at the pick-up location as long as a circuit board with components placed on it is still on the conveyor belt. Any vibration during loading might cause a displacement of components on the circuit board equipped with them. Since the circuit board must be conveyed very slowly and carefully between the placing location and the take-over location or, at least, may only be accelerated and braked very slowly, this transport takes considerable time which increases the cycle time of the apparatus.
  • the conveyor means In order to make this cycle time as short as possible, it is proposed to split the conveyor means into two conveyor belts, a first one extending between the pick-up location for the unequipped circuit board and a hand-over location upstream of the placing location and a second conveyor belt extending from the hand-over location via the placing location to the take-over location. Due to this division, it is possible to convey a new, unequipped circuit-board to the hand-over location—which should appropriately be in close proximity to the placing location—before the completely equipped circuit board has reached the take-over location where it is taken over by the manipulator. As soon as it is taken over, the new circuit board only has to be conveyed over a minimum distance on the second conveyor belt to the placing location.
  • an elevating table is provided at the placing location for lifting the circuit board off the conveyor means.
  • the actuator for raising and lowering the elevating table is preferably driven by a pressurized fluid, i.e. hydraulically or pneumatically.
  • a pressurized fluid i.e. hydraulically or pneumatically.
  • the free cross-section of an exhaust line by which pressure fluid is exhausted from the actuator when lowering the elevating table is smaller than the free cross-section of a feed line by which pressurized fluid is fed into the actutator when raising the elevating table.
  • the cross-section of the exhaust line is reduced only locally by a throttle.
  • the free cross-section of this throttle should be adjustable, so that the speed of the downward movement can be adapted to current requirements by adjusting the cross-section.
  • FIG. 1 is a schematic top view of a device for assembling electronic circuits according to the invention
  • FIG. 2 is a detailed view of the take-over location of the device of FIG. 1 ;
  • FIG. 3 is a perspective view of the take-over location
  • FIG. 4 is a schematic section of the placing location of the device of FIG. 1 ;
  • FIG. 5 is a schematic representation of the pneumatic layout of the placing location.
  • the assembling device of FIG. 1 is transited by the circuit board 1 to be equipped from left to right.
  • the first apparatus of the device is a magazine loader, which, being known as such, is not represented in detail in the drawing.
  • a magazine loader comprises a rack which receives a plurality of circuit carriers and is adjustable in height, so that the circuit carriers 1 may successively be placed in front of a slider 2 which pushes them onto a first belt conveyor 3 .
  • the circuit carriers 1 are here formed of a carrier board 4 of metal having a width selected such that it fits with little clearance onto the belt conveyor 3 and which is slightly tapered at its front end in order to ensure that the carrier board can safely be pushed onto the first belt conveyor 3 without risk of tilting.
  • a metal casing 6 in which circuit components are to placed is fixed to the carrier board 4 by several screwed pads 5 .
  • the circuit carrier might be formed only of such a casing if it has appropriate dimensions for safe transport on the belt conveyor 3 .
  • the first belt conveyor 3 is part of a computer controlled placing apparatus 7 .
  • the placing apparatus 7 comprises a table top 8 on which the first belt conveyor 3 , a subsequent second belt conveyor 9 and magazine containers 10 for the circuit components to be placed in the casing 6 of circuit carrier 1 are located.
  • a gripper arm 13 is mounted to a granite board (not shown) displaceably in vertical and, by means of rails 11 , 12 , in two horizontal directions.
  • the two belt conveyors 3 , 9 are essentially similar in construction. Both comprise a base plate 14 around which two conveyor belts 15 are wound and are driven by a motor. The base plate is delimited at its longitudinal sides by side plates 16 that define a transport path for the circuit carrier 1 and that are slightly divergent at their upstream end in order to provide a safe transition of the circuit carriers 1 .
  • the second belt conveyor 9 differs from the first 3 essentially in that in its upstream portion an elevating table 17 is inserted into the base plate 14 , and that its length is considerably greater than that of the first belt conveyor 3 , so that it extends out of the casing 18 of the placing device and into a subsequent soldering device 19 .
  • the section of the second belt conveyor extending into the soldering device will subsequently be further described with reference to FIGS. 2 and 3 .
  • the soldering device 19 comprises, mounted to a table top 20 , a manipulator formed by a highly precise and vibration-free robot arm 21 , an evacuable solder oven 22 , a support 23 for a circuit carrier dummy and a cooling-off plate 24 formed by a metal plate having cooling water ducts arranged inside it and a slider for pushing a circuit carrier cooled-off on the cooling plate 24 out of the soldering device 19 to a further belt conveyor 26 .
  • the operation of the illustrated device is as follows. At the pickup location 27 , at the beginning of the first belt conveyor 3 , a circuit carrier 1 is pushed onto the first belt conveyor 3 using slider 2 . The first belt conveyor 3 conveys the circuit carrier 1 to a hand-over location 28 for hand-over to the second belt conveyor 9 . At this hand-over location 28 , the two belt conveyors 3 , 9 are butt-jointed, and the occurrence of vibrations during hand-over of the circuit carrier 1 cannot be completely avoided, but is harmless since there are no circuit components placed on it yet.
  • the second belt conveyor 9 has conveyor belts 15 which, at that time, circulate with essentially the same speed as the conveyor belts 15 of the first belt conveyor 3 . They convey the circuit carrier 1 further and come to rest at a placing location 29 , at which the circuit carrier is immediately above the elevating table 17 . By raising the elevating table 17 , the circuit carrier 1 looses contact with the conveyor belts 15 and, instead, has its planar bottom side stably resting on the elevating table 17 . In this way, it is made sure that during the placing procedure, the circuit carrier 1 cannot be displaced by pressure exercised by gripper arm 13 , so that the complete placing procedure can be carried out at a high accuracy.
  • the elevating table 17 is descended again, so that the circuit carrier 1 located on it is again deposited on the conveyor belts 15 of second belt conveyor 9 carefully and without vibrations.
  • the circuit carrier 1 equipped with the circuit components is further conveyed by the second belt conveyor 9 , the acceleration of the circuit carrier being selected low enough to prevent vibrations and slipping of the placed circuit components.
  • a gentle deceleration of the circuit carrier 1 begins.
  • a first sensor 30 e.g. a photo detector, is inserted into the base plate 14 of the second belt conveyor 9 in order to detect the passage of the leading edge of a circuit carrier 1 at a distance from its intended rest position at the take-over location 29 , which is sufficient to bring the circuit carrier to rest without causing vibrations.
  • the first sensor 30 it is e.g.
  • the second belt conveyor 9 is preferably further equipped with a second sensor 31 that extends over approximately 1 to 2 mm in transport direction and provides an output signal proportional to its degree of coverage by the circuit carrier. Based on this output signal, a control (not shown) of the belt conveyor 9 is capable of detecting whether the circuit carrier reaches the second sensor 31 before or after an expected instant, and whether, in consequence, the braking procedure must be shortened or prolonged in order to reach the desired target position 29 .
  • FIG. 3 shows a perspective view of the second belt conveyor 9 having a circuit carrier 1 placed at the takeover location, and, above, an end effector 32 of robot arm 21 .
  • the end effector 32 comprises two claws 33 that are moveable transversely to the transport direction in the direction of arrow P, each having two downward projecting fingers 34 , that have inwardly directed tips 35 at the ends.
  • two cutouts 36 adapted to the size and distance of the fingers 34 are formed, which allow the tips 35 to engage longitudinal recesses 37 at the bottom of carrier plate 4 of the circuit carrier 1 and thus, to lift it safely.
  • FIG. 1 shows the solder oven 22 with an open lid 38 , a circuit carrier 1 placed inside the oven 22 and a dummy circuit carrier 39 placed next to it. This dummy 39 is placed in the oven 22 if a solder process is to be carried out on a single circuit carrier 1 . Its thermal properties are practically the same as of an equipped circuit carrier, so that the temperature distribution in the solder oven 22 is the same in each solder process, regardless of how many locations of the solder oven are occupied by circuit carriers or by dummies.
  • the lid 38 is closed; the solder process is carried out in a conventional manner under vacuum.
  • the lid 38 is opened, and the robot arm 21 extracts the soldered circuit carrier or carriers and places them on the water cooled cooling plate 24 .
  • the slider 25 is operated, and the soldered and cooled circuit carriers 1 are pushed out onto the belt carrier 26 .
  • FIG. 4 shows a schematic longitudinal section through the placing location and the elevating table 17 .
  • the elevating table 17 is a solid metal plate having two through bores in which cylindrical columns 41 are fixedly inserted. The columns 41 are exactly parallel to each other and extend with minimum clearance through bores 42 of table top 8 .
  • the elevating table 17 is vertically displaceable by means of a pneumatic actuator 43 having a double acting piston and a piston rod 45 .
  • Switching valves 44 that control ingress and egress of air into/from the two chambers of actuator 43 are located on the table top 8 at a minimum distance from actuator 43 , in order to minimize pressure vibrations in the chambers which might provoke an uneven movement of the elevating table 17 .
  • the head of the piston rod 45 is received with a clearance in a recess of plate 17 .
  • this head is shown as a sphere engaging a similarly spherical recess; the required clearance may also simply be achieved by a threaded head of the piston rod 45 engaging a threaded bore of elevating table 17 without being fastened to it.
  • the range of movement of the elevating table 17 is limited in upward direction by projections (here formed by rings 46 ) at the lower ends of columns 41 , which, in a completely raised position of the elevating table 17 abut against the bottom side of table top 8 .
  • This construction allows to fix the elevating table 17 in the raised position shown in the Figure without having to squeeze any parts, by merely providing pressure in one of the chambers of actuator 43 .
  • This pressure is selected such that a pressing force exerted from above by the gripper arm 13 when placing a circuit component is not sufficient to override the supporting force of the piston rod 45 .
  • FIG. 5 schematically shows the pneumatic layout of the placing location according to a preferred embodiment.
  • the switching valves are here combined into a single valve 44 ′ having two inputs, two outputs and three switching positions.
  • the valve 44 ′ connects a pressure fluid source, e.g. a compressor, to a lower chamber 51 of the cylinder of the double-acting actuator 43 by a feed line 49 .
  • a check valve 53 in the feed line 49 ensures that pressurized air can only flow through the feed line 49 in a direction from the valve 44 ′ to the lower chamber 51 .
  • the valve 44 ′ When the elevating table 17 has reached a desired level, the valve 44 ′ is switched over into a second position in which the connections between its inputs and outputs are all interrupted.
  • the air thus enclosed in the chambers 51 , 52 of the actuator 43 opposes any vertical displacement of the elevating table 17 .
  • a circuit carrier on the elevating table 17 may have circuit components placed on it.
  • the valve 44 ′ is switched to a third position in which the inputs and outputs are cross-coupled with respect to the first switching position.
  • the upper chamber 52 is provided with pressurized air from compressor 47 by line 54
  • air from the lower chamber 51 escapes by an exhaust line 50 by-passing feed line 49 .
  • the exhaust line 50 has a check valve 55 arranged opposite to the check valve 53 , and a throttle 48 having a controllable free cross-section. The throttle 48 considerably reduces the free cross-section of the exhaust line 50 in comparison with the feed line 49 and the line 53 .
  • the throttle 48 thus causes the air to escape from the lower chamber 51 during the downward movement of the piston much more slowly than from the upper chamber 52 in case of an upward movement.
  • this arrangement allows a fast upward movement of the circuit carrier 1 which is desirable in view of short cycle times, and a slow downward movement which is required in order to avoid vibrations when the circuit carrier settles on the belt conveyor 9 .
  • the speed of the downward movement can be set by controlling the cross-section of throttle 48 .
  • one-way feed and output lines might also be assigned to the upper chamber 52 . In that case, a throttle for braking the downward movement would have to be placed in the feed line.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Automatic Assembly (AREA)
  • Electric Connection Of Electric Components To Printed Circuits (AREA)
  • Supply And Installment Of Electrical Components (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
US10/498,836 2001-12-18 2002-12-13 Apparatus and method for assembling electronic circuits Abandoned US20050108872A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/543,170 US7552529B2 (en) 2001-12-18 2006-10-04 Method for assembling electronic circuits

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10162327.5 2001-12-18
DE10162327A DE10162327A1 (de) 2001-11-09 2001-12-18 Vorrichtung und Verfahren zum Montieren von elektronischen Schaltungen
PCT/IB2002/005753 WO2003053122A1 (en) 2001-12-18 2002-12-13 Apparatus and method for assembling electronic circuits

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/543,170 Division US7552529B2 (en) 2001-12-18 2006-10-04 Method for assembling electronic circuits

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Publication Number Publication Date
US20050108872A1 true US20050108872A1 (en) 2005-05-26

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US10/498,836 Abandoned US20050108872A1 (en) 2001-12-18 2002-12-13 Apparatus and method for assembling electronic circuits
US11/543,170 Expired - Fee Related US7552529B2 (en) 2001-12-18 2006-10-04 Method for assembling electronic circuits

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US11/543,170 Expired - Fee Related US7552529B2 (en) 2001-12-18 2006-10-04 Method for assembling electronic circuits

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US (2) US20050108872A1 (de)
EP (1) EP1466514B1 (de)
CN (1) CN100446650C (de)
AT (1) ATE291830T1 (de)
AU (1) AU2002366508A1 (de)
WO (1) WO2003053122A1 (de)

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US9352430B2 (en) 2010-06-16 2016-05-31 Schleuniger Holding Ag Cable grommet fitting apparatus for cable
US9653865B2 (en) 2011-09-29 2017-05-16 Schleuniger Holding Ag Method for fitting cables with cable sleeves
US9649737B2 (en) 2012-09-12 2017-05-16 Schleuniger Holding Ag Machines and processes for fitting cable bushings
CN107161682A (zh) * 2017-05-25 2017-09-15 常州市范群干燥设备有限公司 压药生产设备及其工作方法
CN109454420A (zh) * 2018-09-26 2019-03-12 芜湖优能自动化设备有限公司 一种出油座全自动装配设备
US11116119B2 (en) * 2017-03-08 2021-09-07 Fuji Corporation Conveyance device and mounting-related device
US11432449B2 (en) * 2012-11-30 2022-08-30 Fuji Corporation Board working system

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JP2009141106A (ja) * 2007-12-06 2009-06-25 Mitsubishi Electric Corp プリント配線基板、空気調和機、プリント配線基板の半田付け方法
US20100047053A1 (en) * 2008-08-19 2010-02-25 Silverbrook Research Pty Ltd Die picker for picking printhead die from a wafer
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ATE291830T1 (de) 2005-04-15
US20070124927A1 (en) 2007-06-07
EP1466514A1 (de) 2004-10-13
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WO2003053122A1 (en) 2003-06-26
CN100446650C (zh) 2008-12-24

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