DE29719763U1 - Device for separating printed circuit boards - Google Patents

Description

Description

Device for separating printed circuit boards

When manufacturing circuit boards, it is usual to initially manufacture a number of circuit boards in one piece, as a so-called circuit board panel. Before or after the electronic components are fitted, the individual circuit boards are then separated from one another. Various separation methods are known for this. The device according to the invention relates to a technology in which the individual circuit boards are divided by means of continuous grooves and are only held together by short connecting webs. In order to separate the circuit boards, it is necessary to separate the connecting webs between the circuit boards gently and without leaving any residue. Devices are known for this purpose, which preferably have hook-shaped separating blades that are pneumatically driven and can be moved vertically in matrices.

Such a device is described, among other things, in the documents of the utility model DE 297 07 050.9. For separation, a printed circuit board blank is placed on the die from above so that the separating knife protrudes through a groove. The printed circuit board blank with the connecting web to be removed is pushed against the hook-shaped separating knife. The downward movement of the separating knife causes the connecting web to be cleanly cut out by the hook-shaped part of the separating knife. To ensure that as few remnants as possible remain when the connecting webs are separated out, the width of the die gap and the thickness of the separating knife must be adapted to the respective groove width. For separation-related reasons, however, it is necessary that a certain cutting gap is present between the separating knife and the parts of the die that form a die gap. However, since pneumatic cylinders are preferably used to drive the cutting knife, the pistons of which are not secured against rotation, it can happen that the cutting knife gets stuck in the die.

zenspalt is slightly twisted around its longitudinal axis. This can cause the cutting edges of the knife hooks to run into the gap-forming edges of the die. This leads to damage or premature wear on the cutting knife and die. Failure to maintain the respective cutting gap also has a negative effect on the cutting quality.

It is therefore the object of the invention to provide a simple device for the clean separation of Lexter plate blanks of the type described above, which does not cause damage or premature wear to the die and separating knife and with which a constant separation quality can be achieved.

This object is achieved by a device having the features mentioned in the protection claim.

The advantages achieved with the invention are in particular that no complex structural measures are necessary for the anti-twisting guidance of the piston, since the die gap adjusted to the thickness of the knife shaft ensures safe guidance of the separating knife.

An embodiment of the invention is shown in the drawings and is described in more detail below.

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Fig. 1 a side view of a device in partial section 30

Fig. 2 an enlarged detail according to section AA

Fig. 3 a front view from the left in Fig. 1

A device 1 according to the invention consists of a lower part 4 accommodating the pneumatic cylinder 2 with piston 3 and an upper part 5. Inside the upper part 5 is the separating

knife 6 is screwed to the piston 3 of the pneumatic cylinder 2. The cutting knife 6 has a knife shaft 11 and a knife hook 12 formed on the side. The cutting knife 6 protrudes through an opening in the upper part 5 and through the die gap formed by the die halves 7; 8. The die gap formed by the die halves 7; 8 is adjusted to the thickness of the knife shaft 11 in such a way that the cutting knife 6 is guided smoothly but without twisting. The knife hook 12 is less thick than the knife shaft 11 (Fig. 2), so that when the knife hook 12 is inserted into the die gap, the cutting gap required for cutting is created.

In Fig. 1, a printed circuit board panel 9 rests on the die halves 7; 8, with a connecting web 10 resting on the knife shaft 11 of the separating knife 6. When the pneumatic cylinder 2 is switched on, the separating knife 6 moves downwards and cuts off the connecting web 10 with its knife hook 12. In Fig. 3, it is visible how the knife shaft 11 is guided between the die halves 7; 8. The separated connecting webs 10 can then easily fall out of the die due to the die gap widening conically downwards.

Claims (1)

Claim for protection Device for separating printed circuit boards which have printed circuit boards divided by grooves and remaining connecting webs, whereby the connecting webs are separated with a separating knife which is movable in a die and consists of a knife shaft and knife hook, characterized in that the knife hook (12) has a smaller thickness than the knife shaft (11). 10