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
  • 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
  • H05K13/0069—Holders for printed circuit boards
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K1/00—Soldering, e.g. brazing, or unsoldering
  • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
  • B23K1/0016—Brazing of electronic components
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K1/00—Soldering, e.g. brazing, or unsoldering
  • B23K1/008—Soldering within a furnace
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
  • B23K3/08—Auxiliary devices therefor
  • B23K3/087—Soldering or brazing jigs, fixtures or clamping means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
  • B65G17/00—Conveyors having an endless traction element, e.g. a chain, transmitting movement to a continuous or substantially-continuous load-carrying surface or to a series of individual load-carriers; Endless-chain conveyors in which the chains form the load-carrying surface
  • B65G17/30—Details; Auxiliary devices
  • B65G17/32—Individual load-carriers
  • B65G17/323—Grippers, e.g. suction or magnetic
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K2101/00—Articles made by soldering, welding or cutting
  • B23K2101/36—Electric or electronic devices
  • B23K2101/42—Printed circuits

Definitions

• the invention relates to a transport device for printed circuit boards according to the preamble of patent claim 1.
• the term "printed circuit board” used in the following for the sake of clarity and brevity is intended, in the present invention, to generally stand for a thin plate-shaped element.
• the thin plate-shaped element may, in particular, be a printed circuit board in the conventional sense, but also, for example, a film element, for example a flexible printed circuit board made of polyester film or the like.
• circuit board in the context of the present invention, endless plate-shaped elements, such as long or endless rigid or flexible circuit boards, be included.
• printed circuit boards are regularly conveyed through process lines.
• printed circuit boards the width-to-thickness ratio of which is unfavorable, as well as flexible or film-based printed circuit boards, may bend in the middle with increasing heating in the soldering furnace. This creates the risk that the printed circuit boards can slide off with their laid on the transport device side edges of the transport device. Furthermore, there is the possibility that sheets which have been bent through in any way remain distorted even after cooling, which can lead to undesirable rejects during production.
• center support devices support the circuit boards at at least one position between the opposite side edges of the boards.
• Known systems make use, for example, of a circulating cable or of a circulating chain, which makes the circuit boards e.g. centrally supported. Also selectively supporting, follower support bolts are known.
• the invention is therefore an object of the invention to provide a transport device for printed circuit boards, with which the aforementioned disadvantages or limitations are overcome.
• a trouble-free and low-distortion passage of the boards is to be ensured by the solder oven even if in the transport device no center support for the board available, or should not be used in the given case.
• This object is achieved by a transport device according to the teaching of patent claim 1.
• Advantageous embodiments of the invention are the subject of the dependent claims.
• the transport device comprises, in an initially known manner, at least one carrying means endlessly circulating between transport wheels and at least partially linearly guided, for example a link chain.
• the transport device is characterized in that the at least one clamping element is movable back and forth between an open position and a closed position by means of a switching device.
• the circuit board in the open position of the clamping element is loosely placed on the at least one support element of the support means, and is pressed in the closed position of the clamping element by the clamping element on the support member.
• the at least one clamping element can be selectively opened or closed by means of the switching device. In this way, the insertion or removal of the printed circuit board in or from the transport device is facilitated.
• the location and time of insertion and / or removal of the printed circuit board in or out of the transport device can be adapted to the boundary conditions of the furnace throughput or the soldering process, thanks to the actively movable clamping element.
• the board is pressed onto the support element or the support elements of the circulating support means.
• the effective surfaces of the support elements and / or the clamping elements can be formed so that due to the clamping effect a bending-resistant clamping of the respective edges of the Pl atinen takes place such that an undesirable deflection of the boards during the passage through the soldering oven is counteracted.
• the switching device comprises an opening device for moving the
• the opening device is preferably arranged directly in the region of one of the transport wheels, which comprises the at least one carrier, For example, the peripheral link chains of the transport device, deflect or drive.
• the opening device is designed as an opening wheel and connected directly to a transport wheel, or formed integrally with the transport wheel.
• the opening device is configured as an opening wheel with at least one actuating finger. The Betuschistsfin- ger is to move the clamping member from the closed position into the open position, formed by contact of the actuating finger on the clamping element during rotation of the opening wheel.
• the invention is first realized independently of how the clamping element is designed and arranged relative to the support member of the rotating support means or the link chain or fixed, as long as the intended clamping effect with respect to the board can be achieved relative to the support element.
• the clamping element is designed as a spring-loaded flap, and connected by means of a hinge nierachse with the support element. This embodiment brings in particular a structurally simple and inexpensive realizable design of the clamping element with it.
• Another particularly preferred embodiment of the invention provides that the closed position and the open position of the clamping element are in each case stable positions of the clamping element.
• the movable between its closed position and its open position clamping element is designed to be bistable, and thus in each case remains stable in its spring-loaded closure position and in its open position, ie in particular without further continued engagement of switching device, Opening device or opening wheel.
• the switching device for the at least one clamping element comprises a closure device separate from the opening device, with which the (bistable) clamping element from its stable open position can be brought back into the spring-loaded closure position.
• the process of clamping the circuit board in the transport device, as well as the process of releasing the circuit board from the transport device, for example, after passing through the soldering oven, carried out by appropriate actuators, which in each case separately at any point in the course of Board transport route can be arranged.
• the closure device for moving the clamping elements from the open position into the spring-loaded closing position are positioned completely independently of the opening device arranged on the transport wheel, for example as an opening wheel, in particular at any point along the linear course of the carrier means.
• another preferred embodiment of the invention provides that at least one tension spring is arranged between the clamping element and the support element in such a way that the clamping element is held stable by means of the tension spring both in the open position and in the closed position.
• the course of the tension spring is chosen so that the longitudinal axis of the tension spring moves back and forth over the hinge axis of the clamping element in the movement of the clamping element between its open position and its closed position.
• a further preferred embodiment of the invention provides that the clamping element and / or the support element are in each case formed as one-piece bent sheet metal parts.
• the hinge axis by means of which the clamping element and the support element are preferably connected to one another, is formed integrally with the clamping element or with the support element, in particular in the form of a stamped part. In this way results in a structurally particularly simple manufacture and assembly of the transport device, in particular with an advantageous in terms of cost minimum number of parts.
• FIG. 1 in a schematic representation of a partial section through
• FIG. 2 in a Fig. 1 corresponding representation and view of the transport device of Figure 1 in the open position.
• 3 is a schematic representation of the transport wheel and the opening wheel of a transport device according to the present invention in a side view;
• FIG. 4 in a schematic representation transport wheel and opening wheel of FIG. 3 in a plan view.
• FIG. 1 and FIG. 2 each show, in a highly schematic representation, a partial section through a transport device according to an embodiment of the present invention.
• FIGS. 1 and 2 two link chains 1 running along the transport device (here perpendicular to the plane of the drawing) can be seen.
• a plurality of support elements 2 are arranged on the link chains 1 (of which only one support element 2 per link chain 1 is visible or shown in FIG. 1 or FIG. 2).
• the support elements 2 have bearing areas 3, on which in Fig. 1, a schematically indicated board 4 is arranged.
• the transport device further comprises the support elements 2 respectively associated clamping elements 5, which are each pivotable about a hinge axis 6 relative to the support elements 2.
• the clamping elements 5 are each pressed by means of a coil spring 7 in the direction of the bearing areas 3 of the support elements 2, that the board 4 between the clamping elements 5 and the support areas 3 of the support elements 2 is clamped.
• the clamping action of the spring-loaded clamping elements 5, together with the support width 8 of the board 4 on the support areas 3, leads to a so-called "fixed beam clamping" of the board at its two longitudinal sides, wherein the fixed clamping by the
• Clamping elements 5 record in the board about bending moments arising, or can initiate corresponding counter moments in the board. As a result, the board is stabilized, and a bending or sagging conditions of the board in its central region when passing through the soldering oven is significantly reduced.
• the opening actuators 9 control the position of the clamping elements 5 between the closed position according to FIG. 1 and the open position according to FIG. 2 by means of vertical deflections.
• the opening actuators 9 do not necessarily have to be pin-shaped be vertically actuatable movable. Rather, the opening actuators 9 may be formed for example by rigid, rail-shaped scenes 9, along the direction of movement of the link chains 1 (perpendicular to the plane) have a varying height profile, so that the clamping elements 5 as a result of the link chains 1 following movement corresponding to the height profile of the rail-shaped Scenes 9 are opened or closed.
• FIG. 3 and 4 Another variant of the operation for the clamping elements 5 between the closed position shown in FIG. 1 and the open position shown in FIG. 2 is shown in Figs. 3 and 4 outlined.
• FIGS. 3 and 4 show, first of all, a gear or transport wheel 10 for driving or for guiding and deflecting one of the link chains 1 of the transport device according to FIGS. 1 and 2.
• the transport wheel 10 is directly connected, or integrally formed, is also a (here shown in a star-shaped) opening wheel 1 1, 12.
• the opening wheel 1 1, 12 has a number of actuating fingers 12, which are used to move the clamping element between the Shut-off position according to FIG. 1 and the open position according to FIG. 2 are used.
• Opening actuators 9 are identified or equated, if it is assumed that the transport device of FIG. 1 and 2 with transport wheels 10 and opening wheels 1 1, 12 as shown in FIG. 3 and 4 is equipped. This means in other words that the transport device is equipped in this case with the illustrated combination of transport wheel 10 for driving the link chain 1 and opening wheel 1 1, 12 for actuating the clamping elements 5.
• Circuit board circuit board

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Electric Connection Of Electric Components To Printed Circuits (AREA)
• Chain Conveyers (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=49080610

Family Applications (1)

Country Status (4)

Families Citing this family (12)

Citations (5)

Family Cites Families (13)

• 2013
  • 2013-07-17 WO PCT/DE2013/000384 patent/WO2015007255A1/de active Application Filing
  • 2013-07-17 CN CN201380049438.2A patent/CN104661936B/zh not_active Expired - Fee Related
  • 2013-07-17 EP EP13753537.3A patent/EP2870085A1/de not_active Withdrawn
  • 2013-07-17 US US14/421,075 patent/US9609794B2/en active Active

Patent Citations (5)

Non-Patent Citations (1)

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