DE1953900A1 - Device for temporarily holding items of different sizes to be processed - Google Patents

Description

Licentia

Patent-Verwaltungs-GmbH 6000 Frankfurt, Theodor-Stern-Kai 1

Ulm, October 17th, 1969

PT-UL / Am / go

U 236/68

"Device for temporarily holding objects of different sizes to be processed ¹¹

The invention relates to a "device for zwischenseitlichen holder of to boarbeitenden objects under" difference dear friend size with at least one intended for receiving the articles Aufnähmefläche _t the plurality of apertures comprises the generating via channels having a negative pressure arrangement are connected such that the receiving surface objects placed and covering at least one of the openings are sucked onto the receiving surface and thus held «

When it comes to machining small components, it is already there known to suck them into a carrier by means of negative pressure and thereby hold them.

BA0 ORIG | _NAL

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The type of maintenance is that it can be removed at any time and that mechanical damage to the component to be held is largely avoided. Up to now it has been common practice to adapt such an underpressure holding device in terms of its mount specifically to the component to be held.

fe The present invention is based on the object of specifying a new device of the type mentioned above, with their help, components of different sizes and shapes can also be held in the meantime in a simple manner can be

According to the invention it is proposed that in the channels to at least some openings by the negative pressure actuated valves are provided which partially seal the channels to prevent unnecessary suction flow when the associated opening in the receiving surface is not adequately covered by an object.

Biii essential advantage of the device according to the invention is seen in the fact that a pump with a lower output is used for the holding device can and that annoying suction noises to you when holding open stands of different sizes and shapes

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largely avoided

Based on the preferred shown in Figures 1 and 2 Exemplary embodiment, the invention is explained in more detail below. Fig. 1 shows a cross section duroh one Detail of a preferred mounting device, such as that used in particular for mounting small electrical components Semiconductor components, is particularly useful «Fig. 2 shows a plan view of the support surface of the entire device according to the invention.

In Fig.l only part of a mounting device according to the invention is shown, only a single suction opening 2 in the receiving surface 1 is shown. The suction opening 2 is connected to the housing via a channel arrangement which, in the exemplary embodiment shown, includes, for example, the channel parts 7, 8, 9, 5, 3 and k. channel k connected to a vacuum pump «The main channel 4 opens, for example, initially into a larger distribution channel 3ι from which a large number of further channels can lead to further suction openings.

According to the invention is now in the channel to the suction opening 2 in the chamber 5 of the channel 9 a partially sealing

BATH ORIGINAL

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tend «· valve arranged, which consists essentially of a light, porous ball 6, which rests against the upper annular mating surface 10 of the chamber 5, separate to the Main channel 4 is connected to a suction pump. By the suction flow that flows through the opening 2 in the receiving area 1 arises, the porous valve ball 6 is torn up and rests against the mating surface 10 of the chamber 5 of the «channel 9». This significantly reduces the suction flow through the opening 2 ·

If an object to be held is now placed on the recording » surface 1 is placed, which closes the opening 2, this object is sucked in by the reduced suction flow and thus held, whereby the effect of the valve ball 6 is largely switched off and this falls down.

It is of crucial importance for the inventive effect of the device that the valve is in the channel to the suction opening 2 in the absence of a cover the same is not absolutely tight, but also allows a small amount of air to flow in when it is blocked. That The valve is only intended to prevent that when the suction opening 2 in the receiving surface 1 is not through a Ge «

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object is covered, excessive intake air flow occurs.

Looking at the device according to the invention in FIG. 2, it can be seen that the distribution channel 3, to which the main channel k is connected for connection to the air pump, is connected to a large number of suction openings 2 via channels 8 four such channels are shown in dashed lines "Of course, all suction openings 2 are connected to the main channel 3." A very large air flow would be sucked in, which means that a very powerful pump would have to be connected to the main channel k.As a result of the valves according to the invention, which cause a significant reduction in these intake air flows, an air pump with a relatively low power is also able to maintain a sufficient negative pressure . If an object to be held, eg. B. a Si plate, placed for an integrated circuit, this covers part of the openings and closes

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this whole. As a result, the plate is sucked onto the receiving surface 1 and held so that it can be processed. The valves that are assigned to the ducts assigned to the suction openings covered by the Si platelet are put out of operation insofar as there is almost no air flow in these ducts, so that the valves open fully, for example in such a way that the Bullet 6 falls down in Pig · 1. The suction openings not covered by the Si platelet have a low air flow which is limited by the valves according to the invention, which are not completely sealed.

A preferred embodiment of such the intake air flow reducing valve is that, as shown in Fig. 1, a ball made of a porous and partially air-permeable material is arranged in a corresponding chamber of the channel. Such a bullet lets a certain flow of air through even when it is sucked onto the mating surface. Such a valve ball consisted in a preferred embodiment a foam, as it is known under the trade name "Styrofoam". By choosing the porosity of the foam, the degree of reduction of the air flow can be adjusted »

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Another preferred embodiment of the invention Device consists in that a ball or the like. Made of air-impermeable material is used and that on the mating surface to which the ball is sucked, an unevenness or a groove is provided that prevents an absolutely tight fit of these valve cones *.

BATHROOM LOCAL GINAL - β -

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Claims (3)

- 8 - U 236/68 Pat θ η t a η 3 ρ r ü c h e 1,1 device for intermediate bracket are of different size objects to be processed with at least one intended for receiving the articles ^ Receiving surface which has several openings which are connected via channels with a vacuum generating arrangement in such a way that the objects placed on the receiving surface and covering at least one of the openings are sucked to the receiving surface and thus held, characterized in that in the Channels to at least a few openings through the vacuum-actuated valves are provided, which partially seal the channels to prevent unnecessary suction flow when the associated opening is in the receiving surface Ψ is not adequately covered by an object. 2. Device according to claim 1, characterized in that that the valves are made of porous movable sealing parts, e.g. B, foam balls, and associated mating surfaces exist. 3. Device according to claim 1 or claim 2, marked 109822/0656 bathroom - 9 - U 236/68 is characterized by its use in the production of small electrical components, in particular for holding semiconductor components such as integrated circuits and Like., During a machining process. BAD ORlQiMAL 109822/065 6 Lee r side