Winding – tensioning – or guiding – Convolute winding of material – Of discrete sheets or articles
Reexamination Certificate
2002-09-23
2003-09-16
Jillions, John M. (Department: 3654)
Winding, tensioning, or guiding
Convolute winding of material
Of discrete sheets or articles
C242S541300, C242S541100, C242S535400
Reexamination Certificate
active
06619580
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a take-up reel on which a veneer sheet in a damp state as cut by a veneer lathe, or a veneer sheet that has been dried from the damp state thereof by a dryer is wound, a veneer reeling apparatus that reels the veneer sheet, a tape feeding unit that feeds a tape into between veneer sheets which is reeled into a veneer roll and a veneer roll unwinding apparatus that automatically unwinds a veneer sheet from a veneer roll wound on the take-up reel to send the veneer sheet to a next step and a production method for laminated wood.
DISCLOSURE OF THE INVENTION
It is an object to provide a take-up reel on which a veneer sheet in a damp state as cut by a veneer lathe, or a veneer sheet that has been dried from the damp state thereof by a dryer is wound and a veneer reeling apparatus that winds a veneer sheet on a take-up reel in a smooth manner while preventing cracks, rifts or the like in directions of fibers of the veneer sheet from occurring. It is another object to provide a tape feeding unit that feeds a tape into between veneer sheets from a tape roll and can cut the tape at an arbitrary timing. It is still another object to provide a veneer roll unwinding apparatus that automatically unwinds a veneer sheet from a veneer roll wound on the take-up reel to send the veneer sheet to a next step.
According to findings from experiments conducted by the present inventors, when a take-up reel (a diameter of 165 mm) that has been used for reeling a veneer sheet before drying, that is a veneer sheet as cut from a log, is used for reeling a veneer sheet after drying with no special consideration, there have been many of cases where the veneer sheet after drying does not adapt itself to a small diameter of the take-up reel and as a curvature of a winding circumferential surface of a take-up reel is smaller as compared with a thickness of the veneer sheet to be wound, cracks are easier to occur in parallel to fiber directions, thereby making it impossible for the veneer sheet to be wound on the take-up reel. Especially, when there are cracks, rifts or the like generated in a veneer sheet after drying, tearing and breaking occur from such defects. The inventors have acquired a way to determine a diameter of a take-up reel on which a veneer sheet after drying is wound in connection with a thickness T of the veneer sheet based on the findings from experiments: A diameter of a take-up reel as a curvature corresponding to a thickness T of a veneer sheet is given based on a ratio of a diameter D of a take-up reel/ a thickness T of a veneer sheet wound thereon and the minimum diameter of a take-up reel is set to 300 mm. According to the way to determine a diameter of a take-up reel, a veneer sheet after drying can preferably be wound on a take-up reel having a diameter equal to or more than 85 times a thickness of a veneer sheet and equal to or more than 300 mm.
According to a take-up reel of the invention, a weight of the take-up reel can be reduced and a burden of driving power can be decreased in transportation of a take-up reel, reeling a veneer sheet, storage of a veneer roll in a veneer roll stock area of a reeling deck and so on. Further, a veneer sheet on a winding circumferential surface of the take-up reel has ventilation passages, in radial direction, in communication with spaces formed in the interior of the take-up reel and openings are formed in winding supports for a veneer sheet fixed on a reel shaft to produce communication between the spaces along the reel shaft direction. With such a structure, since the winding circumferential surface of a veneer sheet of the take-up reel and the spaces formed in the interior of the take-up reel communicate with the air outside the take-up reel, ventilation is ensured. Therefore, hot air, moisture and so on included in the veneer sheet after drying is released through many of openings into the outside air and thereby, an equilibrium moisture content of each wound veneer sheet can be accelerated to reach in the storage.
In the take-up reel, flanges disposed at a spatial interval of a length corresponding to a winding width of a veneer sheet are used as winding supports for the veneer sheet and the veneer sheet is wound on the take-up reel to form a veneer roll. In such a situation, air in spaces between the flanges are released into the outside air through openings formed in the flanges and finally openings of the flanges at both outermost sides of the take-up reel. Therefore, hot air, moisture and so on, included in a veneer sheet after drying, wound on the take-up reel are released from spaces between the flanges into the outside air through openings formed in the flanges and finally openings of the flanges at both outermost sides of the take-up reel, while fresh air in the outside air flows into the interior of the take-up reel through the openings of the flanges at both outermost sides of the take-up reel.
A veneer sheet after drying is wound on the take-up reel as a pair of two overlapping veneer sheets with threads as guide to form a composite veneer roll. The composite veneer roll is prepared for combination of a face veneer sheet and a substrate veneer sheet for use in a multi-ply laminated wood and two veneer sheets are superimposed on each other while fiber orientations of the respective sheets are aligned to be the same as each other. The two overlapping veneer sheets are composed of those of different kinds or preferably composed of a face sheet and a substrate sheet, wherein the face and substrate sheets are each selected from various kinds thereof. Further, since face and substrate sheets are almost of the same in grade, two face sheets of the same kind or two substrate sheets of the same kind are sometimes combined to form two overlapping veneer sheets.
Further, pairs of two overlapping veneer sheets and single veneer sheets, both after drying, with a pair of overlapping veneer sheets and a single veneer sheet as a set, are alternately wound on the take-up reel with threads as guide to form a composite veneer roll. The composite veneer roll is prepared for use in five-ply laminated wood, and a pair of two overlapping veneer sheets and a single veneer sheet, both of the same fiber orientation, are combined as a set. The three veneer sheets composing the set can be constituted of those of different kinds from one another or preferably constituted of a face sheet, a substrate sheet and a central core sheet, wherein the face, substrate and central core sheets are each selected from various kinds thereof. Face and substrate sheets in an overlapping state as pairs and single central core sheets are alternately wound on a take-up reel. Further, since face and substrate sheets are almost the same in grade, two face sheets of the same kind or two substrate sheets of the same kind are sometimes combined to form two overlapping veneer sheets.
A veneer reeling apparatus of the invention comprises: a take-up reel installed in a veneer reeling position in a rotatable manner; a drive roller that is disposed below the take-up reel and which transmits a driving force at a variable speed; a veneer dryer installed upstream from the veneer reeling position; a connection conveyor installed between the terminal end of the veneer dryer and the drive roller in the veneer reeling position; and a plurality of thread feeding mechanisms arranged at arbitrary spatial intervals in the length direction of the take-up reel, wherein a continuous veneer sheet that has been dried in a veneer dryer can be wound on the take-up reel with threads in plural rows arranged in the length direction of the take-up reel as guide.
Further, a veneer reeling apparatus of the invention comprises: a take-up reel installed at a veneer reeling position in a rotatable manner; a drive roller that is disposed below the take-up reel and which transmits a driving force at a variable speed; a veneer dryer installed upstream from the veneer reeling position; a direction change-over conveyor installed between the terminal end
Kawamori Hideki
Kohara Yasuyuki
Mizuno Akihiro
Murakami Masanori
Nakagawa Shin-ichi
Jillions John M.
Kabushikikaisha Taiheiseisakusho
Snider Ronald R.
Snider & Associates
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