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New parts-removal robots feature speed, reliability and programmability.

New Parts-Removal Robots Feature Speed, Reliability and Programmability

Programmable versatility, speed, and durability are claimed for a new line of parts removers for injection machines ranging from 50 to 2500 tons. Sterltech Div. of Sterling, Inc., Milwaukee, says one key to its new Sterltech/ Star TW-B Series of robots, manufactured by Star Seiki of Japan, is the patented dual vertical motion. The TW-B Series employs a pneumatic vertical cylinder combined with a belt-drive mechanism. The belt drive is said to multiply the speed of the pneumatic cylinder, as well as provide a cushion to absorb shock at the ascent end. This combination is reported to dramatically improve take-out times without sacrificing reliability. For example, the Model TW-800B, designed for 100-250 ton machines, achieves a dry-cycle take-out time of only 1.8 sec (mold-open time).

Another speed-enhancing feature of the TW-B Series is a new electric traverse motor. The three-phase induction motor, with pulse-modulated drive, is said to deliver fast, smooth, accurate performance. Sterltech says that its newest series offers improved variable acceleration and deceleration, as well as multiple-stop capabilities said to be accurate [plus or minus] 0.039 in. When combined with the speed of the dual vertical motion, the overall cycle time of the TW-B Series is shorter than for previous Sterltech/Star models. For the previously referenced TW-800B, the overall dry-cycle time is said to be 8.0 sec.

Besides speed, these robots are designed for accuracy. Slow-speed descent at the product-drop end is said to give smooth and precise product placement. And linear-motion guide rails ensure smooth, accurate motion on both vertical and traverse stroke.

PROGRAMMABLE VERSATILITY

New microprocessor controls also come with the TW-B Series. The STEC-311 programmable microprocessor controller includes a removable programming pendant with a new ergonomically designed handle. Connected to the main control panel by a fiber-optic cable, the hand-held pendant is said to allow convenient setup and operation of the robot while the control box is kept in an out-of-the-way location.

Up to 10 multiple-stop positions can be programmed along the traverse stroke. Sprue placement can be during either outbound or return traverse motion. A 40-character, two-line LCD message panel on the STEC-311 pendant is standard. The display provides I/O status, mode-selection information, timer and counter display, and alarm messages. In the event of a malfunction, the message display will inform the operator of the cause of the problem, as well as the corrective action required.

Fiber-optic links between the STEC-311 controller and both the pendant and the robot are said to ensure interference-free communications.

Other standard features are said to include: low-profile design, ability to clear higher-than-normal safety gates, venturi vacuum system for more reliable air supply to end-of-arm tools, and synchronized ejection of the press ejector stroke with the crosswise stroke of the robot arm.

Sterltech also offers several optional features, including a second vertical arm for sprue and runner removal from three-plate and stack molds; insert-loading into either mold half; selectable product removal from either mold half; gate cutter; mold-release spray system; product rotation after removal; defective-part rejection circuit; and delayed traverse, moving the "home" position away from the mold area to provide clearance for core-pull cylinders or other vertical obstructions.

The TW-B Series will become available in March at prices starting at under $30,000. A two-year parts warranty is standard. (CIRCLE 22)

PHOTO : New Sterltech/Star TW-B Series robots employ a patented dual vertical motion. A standard pneumatic cylinder combined with a belt mechanism is said to multiply speed of the cylinder while absorbing shock at the ascent end and improving take-out time.

PHOTO : TW-B Series robots come with a removable control pendant connected to the main control panel by fiber-optic cable, which improves communication reliability as it isn't susceptible to EMI interference.
COPYRIGHT 1990 Gardner Publications, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 1990, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

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Publication:Plastics Technology
Date:Feb 1, 1990
Words:627
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