Abrading – Precision device or process - or with condition responsive... – Computer controlled
Reexamination Certificate
2000-01-07
2001-08-21
Banks, Derris H. (Department: 3723)
Abrading
Precision device or process - or with condition responsive...
Computer controlled
C451S124000, C451S150000
Reexamination Certificate
active
06276988
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of Invention
The present invention relates an improved fully automatic scraper grinder and, in particular, to a grinder that comprises an emery wheel base, a set of upper and lower fine tuning devices driven by a motor provided thereon, and a set of front and back two-step displacement device driven by a cylinder. By incorporating a specially designed emery wheel with two different sizes of emery on the front and back, the emery wheel can provide a set of fully automatic grinding procedure that can first roughly grind then finely grind according to different scrapers using a digital control system. Furthermore, a worm type angle adjuster is provided on a scraper holder for adjusting the angle of the scraper holder, an automatic switching aspirator is provided on the emery wheel base for automatic switches to single sided air intake in the reciprocating motion of the emery wheel to remove the dusts produced by the scraper grinding.
2. Related Art
Since currently all scraper (i.e., the ink scraper used in the halftone printing) grinders in the world are of the semi-automatic type; namely, an operator has to operate and monitor while grinding so as to control the scraper in an automatic cycle of the emery wheel. Furthermore, currently used grinding wheels are emery wheels or emery stripes. It is very lately that a U.S. made diamond emery wheel is available. However, since scrapers need to be finely ground, small diamond particles have to be employed. Each time the scraper is inserted into the emery wheel with diamond granules by 0.1 to 0.2 mm. If the scraper is inserted too much, then the grinding surface would be overheated so that the scraper or dusts become sticky and affect the quality of the scraper and the grinding surface of the emery wheel. Nevertheless, each scraper has 0.2 to 10 mm to be ground, so the scraper has to be inserted several times to complete the whole grinding process. This is a very time-wasting and tiring job, which is one defect of the conventional scraper grinder.
Moreover, dusts will be produced while grinding the scraper. Therefore, the scraper grinder is always provided with a dust remover. Since the scraper is ground by moving the emery wheel sideways reciprocally, the emery wheel motor also switches its rotational directions in this reciprocal process. When the emery wheel grinds in one direction, the dusts are exhausted to the other. So the air intake pipe of the conventional dust aspirator has a main sucking pipe that is divided into two side pipes on both sides of the emery wheel and sucking at the same time. The suction is thus divided in halves and appears to be insufficient. It can roughly obtain 60% of the dust removing effect, which is another defect of the conventional scraper grinder.
The scraper grinder is equipped with a scraper holder, which can be turned and adjusted to a proper grinding angle. Yet, conventionally the angle adjustment of the scraper holder is done manually. When the holder is too long or the operator is female, it is hard to hold and operate, which in turn affect the precision of the scraper grinding angle. This is the other defect of the conventional scraper grinder.
SUMMARY OF THE INVENTION
In view of the foregoing disadvantages, the instant invention provides an improved fully automatic scrape grinder, which comprises an emery wheel base, a set of upper and lower fine tuning devices driven by a motor provided thereon, and a set of front and back two-step displacement device driven by a cylinder. By incorporating a specially designed emery wheel with two different sizes of emery on the front and back, the emery wheel can provide a set of fully automatic grinding procedure that can first roughly grind then finely grind according to different scrapers using a digital control system.
Another object of the present invention is to provide an improved fully automatic scraper grinder, which comprises a worm type angle adjuster on a scraper holder for adjusting the angle of the scraper holder by rotating a wheel. The worm of the same axis then drives a corresponding worm wheel so that the angle of the scraper holder connected thereon can be adjusted. An angle gauge is also provided for visual adjustment.
Furthermore, the instant invention provides an improved fully automatic scraper grinder, which further comprises an automatic switching aspirator on the emery wheel base for automatic switches to single sided air intake in the reciprocating motion of the emery wheel to remove the dusts produced by the scraper grinding.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
REFERENCES:
patent: 3872627 (1975-03-01), Schuster
patent: 4055918 (1977-11-01), Bralander et al.
patent: 4694613 (1987-09-01), Bernhard
Banks Derris H.
Dougherty & Troxell
Ojini Anthony
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