Browse Prior Art Database

Injection Press Control

IP.com Disclosure Number: IPCOM000083116D
Original Publication Date: 1975-Apr-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 3 page(s) / 48K

Publishing Venue

IBM

Related People

Iwata, PG: AUTHOR [+3]

Abstract

A single plastic injection press may operate in any one of several side core sequences while retaining all the original press controls.

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Injection Press Control

A single plastic injection press may operate in any one of several side core sequences while retaining all the original press controls.

Plastic injection presses may include provisions for inserting cores into mold cavities to form complex plastic parts. Conventional machines normally accommodate side cores (also known as side draws) as part of the sequence prewired for a particular application. Here, an existing prewired sequence control is paralleled with additional circuits, to permit the selection of four or more different side core sequences. This greatly increases the versatility of a machine.

In Fig. 1, the original press controls supply control signals to a press for sequencing its operations in accordance with manual inputs, prewired sequences and press status signals. Examples of these signals appear in the Table. Only one of the prewired sequences is normally available in any given machine. The diode matrix permits selection of additional sequences by gating the press control signals. and providing control outputs to sequence side core driving cylinders. The press control signal gating and side core control signals are determined by the matrix as a function of: the original press control signals, the press status signals, the sequence selection, and side core status signals.

Fig. 2 shows how one press control signal (close clamp) is gated, using AND/OR logic, at the times of different press status and original control signals selected by any one of four sequences. For example, if sequence A is selected, the close clamp signal occurs when a close clamp signal is received, if the ejectors are not reset.

When the ejectors are reset, the close clamp signal is turned off and the insert core sig...