Clamping unit with double crank drive

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/66 (2006.01)

Patent

CA 2568688

The invention relates to a locking unit for an injection moulding machine, comprising a fixed tensioning plate (1), a support plate (3) and a moving tensioning plate (2), arranged such as to be displaced between the fixed tensioning plate (1) and the support plate (3), whereby the moving tensioning plate (2) is supported against the support plate (3) by interposing an opening and locking mechanism (4), for back and forth movement and at least one tensioning means (6) is provided between the support plate (3) and the fixed tensioning plate (1), to permit the build up of a locking force between the fixed (1) and the moving (2) plates. According to the invention, the opening and locking mechanism is embodied as a crank drive (4), with at least one crank disc (9), driven in rotation by means of a drive (32) and connected to the support plate (3) by means of at least one crank arm (11') of a first type and to the moving plate (2), by means of at least one crank arm (11") of a second type, whereby at least said second type or the first type of crank arm (11', 11") has an eccentric connection to the crank disc (9) with a rotary drive.

La présente invention concerne une unité de fermeture destinée à une machine de moulage par injection, comprenant une plaque d'application de tension fixe (1), une plaque d'appui (3) et une plaque d'application de tension mobile (2) qui est disposée pour pouvoir effectuer un mouvement alternatif entre la plaque d'application de tension fixe (1) et la plaque d'appui (3), la plaque d'application de tension mobile (2) prenant appui contre la plaque d'appui (3) avec intercalage d'un mécanisme d'ouverture et fermeture (4), pour effectuer un mouvement vers l'avant et vers l'arrière, et au moins un élément de traction (6) étant disposé entre la plaque d'appui (3) et la plaque d'application de tension fixe (1), pour permettre la constitution d'une force de fermeture entre la plaque fixe (1) et la plaque mobile (2). Selon l'invention, le mécanisme d'ouverture et fermeture se présente sous la forme d'un entraînement à manivelle (4) comprenant au moins un disque de manivelle (9) qui est entraîné en rotation par un entraînement (32), et est relié à la plaque d'appui (3) par une bielle (11') d'un premier type, et à la plaque mobile (2) par une bielle (11'') d'un second type, la bielle du premier type (11') et/ou la bielle du second type (11'') étant articulée(s) de façon excentrique au niveau du disque de manivelle (9) entraîné en rotation.

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