Woodworking – Process – Mechanical cutting or shaping
Patent
1993-06-04
1994-12-20
Bray, W. Donald
Woodworking
Process
Mechanical cutting or shaping
144 3R, 144134R, 144136R, 144242C, 144247, 144249R, 144368, 144369, 198782, B27C 112, B27C 500
Patent
active
053738802
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a method of continuously processing elongated articles, such as coherent pairs of chopsticks, the outer shape of which is defined by two mutually parallel surfaces and two opposing, plane, oblique surfaces inclining towards one another by the same inclination seen relative to a common plane of symmetry, by which method the articles are advanced in the longitudinal direction while passing pairs of processing implements. The invention also relates to an apparatus for carrying out the method.
BACKGROUND OF THE INVENTION
DK-PS No. 155,697 discloses a method of processing chopsticks produced in coherent pairs, the pairs being coherent only for a short distance along abutting surfaces. When the chopsticks are to be used, the user merely breaks the coherent portion. During processing, the chopsticks are continuously advanced through a processing apparatus along a track, the chopsticks being centrally aligned in the track while they pass one or more processing implements. The centering is ensured by means of identical centering rolls operating from their respective side of the plane of symmetry of the chopsticks. The centering rolls are biased by a spring tension. The processing implements for processing the edges of the articles along the oblique surfaces are associated with centering rolls, and accordingly they follow the movement of these centering rolls along the oblique surfaces of the articles in a direction away from their plane of symmetry during the passage of the articles.
SUMMARY OF THE INVENTION
The method according to the invention is characterized in that, during the advancing movement, one oblique surface of the articles, the common longitudinal plane of symmetry, and the second oblique surface are aligned one by one substantially parallel to a common plane of alignment extending in the direction of advance and are processed by a pair of processing implements associated with each aligning position, the advance being carried out by means of continuously rotating friction rolls engaging the mutually parallel surfaces of the articles.
The resulting method allows quick, uniform, and efficient processing of succeeding articles, which is especially due to the fact that the implements need to operate only on edges parallel to the common plane of alignment during the processing. Accordingly, the axes of the processing implements need not move more than necessary to take into account dimensional differences of the individual articles. Thus, the processing implements can relatively quickly and easily enter a correct starting position for receiving a new article, with the result that the articles can be high-quality processed and be advanced at a relatively high speed, so that approximately 30,000 articles can be processed per hour.
The apparatus for carrying out the method comprises conveyor means advancing the articles in a longitudinal direction, as well as processing implements processing the articles while they pass through the apparatus. The apparatus comprises a number of activatable friction rolls adapted to engage the parallel surfaces of the articles and to advance the articles during passage of the processing implements. The apparatus comprises two guides interspaced when seen relative to the direction of advance, and being associated with their respective set of processing implements and comprising opposing plane guide surfaces which are parallel to a common plane of alignment extending in the direction of advance and substantially perpendicular to the axes of rotation of the friction rolls, where the guide surfaces successively engage the oblique surface of the advanced articles, the articles being pressed against said guide surfaces by means of resilient pressing means. Identical centering rolls are provided between the guides and operate from their respective side towards the common plane of alignment, the centering rolls being biased by uniform spring tension and engaging the respective oblique surfaces of the articles so as to align the plane of
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Bray W. Donald
Stormax International A/S
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