DE8707747U1 - Device for cutting plastic - Google Patents

Description

it-. Device for cutting

of plastics

The innovation relates to a device for cutting plastic of the type mentioned in the preamble of claim 1.

Cutting devices of this type are known in which the bracket is guided by hand. They are only suitable to a limited extent for the production of wings for aircraft models, since this requires precise adherence to a specified wing profile.

The aim of the innovation is to create a device of the type mentioned with which this is possible. This aim is achieved by a device with the features of claim 1.

Any wing profile can be cut through the precise guidance and movement of the wire frame using drives controlled by a computer.

With an embodiment of the device according to claim 2, a particularly simple structure of the drives is achieved. The preferred embodiment according to claim 3 ensures secure guidance of the holder or the slide along the associated spindles.

The innovation will now be explained in more detail using the attached figures. It shows:

Pig.l oine front view of an embodiment of 4-way device _for

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Fig. 3a and 3b Representations of the movement sequence in the two directions (horizontal and vertical)* A plastic sheet KB, which can be cut using a hot wire, is placed on a support board 1 and from which a wing profile TB is to be cut out. The cutting wire XB is fastened to the cutting frame. The cutting frame is held at both ends by a cross support.

Each cross support has a holder 4 that can be moved in a direction perpendicular to the support board 1 (y-direction). The holder is supported on a slide 5 via sliding guides 4a. A vertically extending spindle 6 is mounted on the slide 5 and engages with a driver 4b of the holder 4. An electric motor 8 is assigned to the upper end of the spindle 6 via a gear 7.

The carriage 5 can be moved by means of sliding guides 5a on a support carrier 9 in a horizontal direction perpendicular to the direction of extension of the cutting wire 2. A spindle 10 is arranged on the support carrier 9, which extends in this direction (x-direction) and to one end of which an electric motor 11 is directed. The spindle 10 passes through a driver 5c of the carriage 5. The drives 8 and 11 of the two cross supports are controlled by a computer. This is programmed in such a way that when a plastic strip is placed between the two cross supports,

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block starting from position A of the cutting wire § in Fig. 3a and 3b, this is advanced according to the desired profile curve K through the plastic block ..KB and then returned to the end position B, whereby the drives 11 ensure the forward and backward movement and the drives 8 raise and lower the cutting wire. Depending on the desired profile, the control of both motors 8 or II can be identical or the motors 8 can be controlled differently, just like the motors 11, e.g. a different control of the motors II would lead to an inclination of the cutting wire 2 with respect to the third spatial direction (z-direction).

The holder of the cutting wire 2 is designed in such a way that a heating current can flow through the wire.

Claims (2)

-A-Aaclaims 1. Device for cutting a plastic block by means of a hot cutting wire, which is clamped with its "both ends in a cutting bracket and can be connected to a voltage source, characterized in that that for cutting a predetermined profile from the plastic block, the cutting bracket (3) is connected at its ends to a holder (4) that can be moved perpendicularly (y-clearance) to the support (1) of the plastic block, which is arranged on a carriage (5) together with a drive (8) assigned to it, and that the carriage (5) can be moved parallel to the support (1) of the plastic block by a second drive (11) in a direction perpendicular to the first direction (x-direction), whereby the drives (8, 11) can be controlled by a computer. 2. Device according to claim 1, characterized in that the drives each consist of a spindle (6, 10) extending in the direction of movement, a driver (4a, 5c) arranged on the spindle and connected to the holder (4) or the carriage (5) and an electric motor (8, 11) cooperating with one end of the spindle. 3* Device according to claim 1 or 2, characterized in that the holder (4) or the carriage (5) are guided on sliding guides (4a, 5a, 5b). &bull; * * ti* · * * * IMI &bull; 4 · t It