Bookbinding: process and apparatus – Apparatus – With control means responsive to sensed condition
Patent
1993-05-13
1995-10-03
Fridie, Willmon
Bookbinding: process and apparatus
Apparatus
With control means responsive to sensed condition
412 37, B42B 900
Patent
active
054546800
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a binding apparatus for binding loose sheets into covers provided inside at their spines with a thermoplastic adhesive to form a volume and comprising a frame with two mutually and adjustably spaced supports acting as an insertion shaft for the covers, said shaft being fitted at its lower side with a heater, and further comprising a cooling system.
Such binding apparatus illustratively is described in the German patent 35 14 222: it comprises a frame with an insertion shaft formed by two mutually parallel, vertical walls acting as supports. One rest wall is stationary relative to the frame, whereas the other rest wall rests in displaceable manner relative to-and-fro the stationary one. In this manner the spacing between the two rest walls can be adjusted while they remain mutually parallel.
Underneath the insertion region of the rest walls, the insertion shaft is bounded by a heater in the form of a heating plate. This heating plate consists of a top-side, horizontal deposition surface and of an electrical heating unit making it possible to raise the deposition surface to temperatures of up to 200.degree. C. for instance.
When binding, first a stack of paper or plastic sheets is formed and then placed into one set of covers. Such covers consist of a spine with the side covers proper joined to it by a fold and further of a strip of hot-melt adhesive deposited on the inside of the spine. When binding, the covers together with the sheets laid into them are placed in the insertion shaft in such a way that the outside of the spine comes to rest on the heating plate. Next the displaceable rest wall is moved toward the stationary rest wall in order that the covers retain their vertical position during binding. Thereupon the heating plate is powered electrically to a temperature higher than the melting point of the hot-melt adhesive strip. This strip then softens and as a result the sheets laid into the covers sink by their lower edges into the hot-melt strip and are wetted by it.
After some time, the displaceable rest wall is moved back to remove the volume consisting of the covers and sheets from the binding apparatus. The volume is then deposited, spine at the bottom, on a deposition surface formed into the apparatus frame and serving as a cooling system to allow the volume to cool. Thereby the hot-melt adhesive strip again solidifies and firm bonding of the sheets into the covers has then been achieved.
The known binding apparatus are designed for office use. Where a substantial number of volumes must be bound, the known office binding apparatus are rejected in large part because they incur the operational drawback that following binding, the volume must be removed from the binding apparatus and be transported by means of a corresponding deposition surface to a cooling system.
Therefore it is the object of the invention to create a binding apparatus designed for making substantial quantities of volumes and in particular not requiring removing the volumes from this apparatus for purposes of cooling.
This problem is solved by the invention in that the insertion shaft is extended at least on one side and in that the cooling system is received in tints extension further in that a conveyor with a revolving drive is provided to carry the covers put into the insertion shaft from the heater to the cooling system.
Accordingly, in the invention, the binding apparatus comprises an enlarged insertion shaft with cascaded heater and cooling system, whereby following being heated in the heating system, the volumes no longer require being removed from the insertion shaft for the subsequent cooling stage. A conveyor with revolving drive is provided for the advance between the heating and the cooling systems, and therefore the volume is moved mechanically. Moreover the feasibility is provided thereby to simultaneously bind two sets of volumes inside the binding apparatus, one set always being in the zone of the heating system and the other set in the zone of the cooling system. The binding apparatus of th
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Berenato, III Joseph W.
Fridie Willmon
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