FR2510341A1 - DEVICE FOR FASTENING AND LOOSEN PLATEBOARDS OF PRINTED CIRCUITS ON A GALVANOPLASTY MOUNTING - Google Patents

Abstract

THE INVENTION CONCERNS A DEVICE FOR FIXING AND LOOSENING PRINTED CIRCUIT BOARDS ON A GALVANOPLASTY ASSEMBLY, BY TIGHTENING AND UNSCREWING SCREWS ON THESE PLATES IN THE SAME PLANE OF BOTH SIDES OF A CENTRAL BAR. THIS DEVICE IS CHARACTERIZED IN THAT IT INCLUDES ROTATION DRIVES 1 FOR TIGHTENING AND UNSCREWING THE SCREWS IN QUESTION 9. APPLICATION TO SEMI-AUTOMATIC MOUNTING OF PRINTED CIRCUIT BOARDS ON GALVANOPLASTY PLANTS.

Description

The invention relates to a device for securing

  and loosen printed circuit boards on a wire

  electroplating stage, by screwing and unscrewing screws on these pads in the same plane on both sides of a central bar. Devices of this kind are not known until now, such pads have always been fixed or loosened by hand on fixtures

  electroplating by screwing and unscrewing butterfly screws.

  This takes a lot of time, and, furthermore, naturally leads to

  support pressures which are different from a plate

to the other.

  The object of the invention is to create a device

  which allows to fix and loosen mechanically with a

  defined support ratio of printed circuit boards on

electroplating assemblies.

  This object is achieved according to the present invention by a device of the type specified above, characterized in that it comprises rotational drives for screwing

and unscrewing said screws.

  Advantageous embodiments of the invention

  The invention further provides that: a) said rotational drives constitute units operating independently of one another; b) for actuating said rotational drives as

  subassemblies, the device includes racks

  carrying a pinion and an axle; c) pneumatic cylinders cooperate with said racks;

  (d) a regulating device is provided, which is preferably

  a manometric valve, which regulates the rotational cople

  said rotational drives;

  e) these rotational drives comprise a coupling piece

  which is axially movable on a splined shaft

  and which is provided with a spring clamping said hinge piece

on the screws;

  f) these coupling parts are made mobile pneumatic-

  by means of a clutch plate;

  (g) the device includes receiving and fixing blocks

  for mounting; h) this device also includes safety slides for mounting, and

  i) induction switches are arranged next to the

  rotational trainings for control of operations.

  This device is used for semi-automatic screwing and unscrewing of butterfly screws which are arranged in the

  same plan, on an electroplating fixture, on both sides-

a central bar.

  The rotational drives specified above are units working independently of each other, their rotation being produced by a rack which drives

  an axis through a pinion Each of these cracks

  Mesillères is powered by a pneumatic cylinder Thanks to the separation between the various drives, it is possible

  to open and close the various units within a cor-

  respondent independently in time and with the

  same air pressure, and in the best conditions.

  The fact that the same air pressure is used

  The advantage is that the same torque is pro-

  on all butterfly screws of the electroplating assembly.

  This torque can be adjusted advantageously by means of a control valve.

  meter and It provides the necessary holding force for the

  screwing printed circuit boards to be electrolyzed.

  The rotational drives are each provided with a coupling part This is mounted on the spline shaft; it is axially movable and is tightened by a

  spring on the butterfly screws of the electroplating assembly.

  During its rotation, the screw engages in the coupling piece and turns with it until

  the rack has reached the final position corresponding to

  this stops the movement, or until the resistance due to blockage of the wafer is greater than

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to the force of the pneumatic cylinder.

  All coupling parts can be

  pulled down by pneumatic cylinders through

  the rack can be pushed into the left or right basic position, without the throttle

  In order for the mounting to be easy to set up

  in the device, the coupling parts are also retracted downwards as has been described.

  fixed in corresponding receiving blocks and slides

  pneumatic buckets prevent it from escaping.

  The driving of the device according to the invention is as simple as possible Before the introduction of each

  assembly, we go by definition in the basic position, for ame-

  the racks in the zero position.

  This basic position can be either left or right in the machine, depending on whether you start with a

butterfly screw open or closed.

  Opening races and closing operations are controlled by induction switches, which

  are all next to the rotational workouts.

  The following description, which does not present

  no limitation, will allow to understand how the invention can be put into practice It should be read with reference to the accompanying drawings among which:

  FIG. 1 represents a cross-sectional view of

  versale of the device according to the invention;

  FIG. 2 represents a sectional longitudinal view

  tudinal of this device; FIG. 3 represents a view from above of a detail of this device;

  FIG. 4 represents an assembly of galvano-

  plasty with screws arranged in the same plane,

two sides of a central bar.

  Figure 1 helps to understand how

  The screws 9 serving, on an electroplating assembly 15, to block printed circuit boards 16 engage the coupling piece 7 with a rotational drive 1, when the mounting 15 is turned on.

in place in the device.

  The coupling parts 7 are axially movable

  This is connected by a bush 17 to an axis 4 whose lower end carries a pinion 3, not shown in FIG. 1. This pinion meshes with a rack 2, which is connected by Via a stirrup 18, to the push rod 19 of a pneumatic cylinder 5 The screw tightening torque 9 can be modified by means of compressed air which is fed to a pneumatic cylinder 5, by means of

to a regulating device 6.

  For the printed circuit boards 16

  inserted at the correct height in the openings of

  cage 34 of electroplating fixture, grab bars

  vertically adjustable 21 are placed on the table of

  These bars also receive

  14, whose signals are used for the automatic control of the device So that the mounting can be placed and fixed in the exact position in the device

  the coupling parts 7 must first be

  This is done using a clutch plate

  11, which is also pneumatically actuated.

  When the assembly 15 is introduced, the sheet metal

  It moves up and the coupling parts

  7 attack the butterfly screws 9 of the galvano-

  plasty. Figure 2 shows a spring 10 acting on

  the coupling parts 7 It also shows the posi-

  pinion 3, which meshes with the rack 2 A block of

  receiving 12 serves to fix the mounting 15 in the correct position.

  A pneumatic jack 23 is connected to the clutch plate 11 and

  it pulls it down, so that the coupling pieces

  7, at the time of actuation.

  Figure 3 shows a detail of the device

  according to the invention, seen from above The assembly 15 which is not

  presented that schematically is introduced in the device.

  It is fixed laterally by brackets 24 and is now

  This slider is shown once in the extended position 25 and once in the retracted position. It is also actuated by a pneumatic jack. It can be seen from the figure that at each

  rotational drive 1 corresponds to an inductive switch

  14, which records whether there is a printed circuit board there and whether it is to be fixed or released. This makes it possible to operate only the rotational drives 1 which are necessary in

each case.

  FIG. 4 represents an assembly of electroplating

  complete tie 15, consisting of a mounting head 27, a suspension bar 28, cleats 29 having locking apertures 34, and screws 9 With the aid of a flywheel 31 and a screw pressure 32, the assembly 15 can be blocked on a rod 33 One or more fixtures suspended from this rod

  33 are transported at the same time to

  The view from the side shows that the gripping vanes of the screws 9 are all in the

same plan.

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Claims (10)

  1. Device for securing and loosening   printed circuit boards on an electroplating assembly by screwing and unscrewing screws on these plates in the same plane on both sides of a central bar, characterized in that   it includes rotational drives (1) for the screw wise and unscrewing the screws (9).   2. Device according to claim 1, characterized   characterized in that said rotational drives (1) are units operating independently of one another others.   3. Device according to any one of the   1 and 2, characterized in that for actuation   rotational drives (1) constituting subassemblies   it includes racks (2) with a pinion (3) and an axis (4).   4. Device according to any one of the   1 to 3, characterized in that pneumatic cylinders   (5) cooperate with said racks (2)   Device according to any one of the   1 to 4, characterized in that it comprises a device   regulating device (6), preferably a manometer valve,   which regulates the rotation torque of said drives in rotation tation.   6 Device according to any one of the   1 to 5, characterized in that the rotational drives (1) comprise a coupling part (7), which   is axially movable on a splined shaft (8) and which is   denies a spring (1 o) tightening this coupling part on the screws (9).   7. Device according to any one of the   1 to 6, characterized in that the coupling parts   (7) are made pneumatically movable by means of   of a clutch plate (11).   8 Device according to any one of the   1 to 7, characterized in that it comprises receiving and fixing blocks (12) intended for mounting 7,251,034} electroplating.   9. Device according to any one of the   Claims 1 to 8, characterized in that it includes   safety strips (13) for electroplating assembly.   Device according to any one of Claims 1 to 9, characterized in that inductive switches (14) are arranged next to the drives.   in rotation (1) for the control of the operations.