An embodiment of the invention is described below with reference to the drawing, in which:
As may be understood from the figures, the strip-like spine insert 1 is unwound from a not-shown supply reel and drawn forward into a transport channel 2 by first and second pairs of cut length transport rollers 3.1 and 3.2 that are spaced apart from one another and respectively composed of a driven roller and a spring-loaded roller 3a and 3b, wherein the spine insert is also positioned in a cutting device 9 for cutting off a spine insert 1 of the desired format length L.
Subsequently, pairs of feed rollers 4.1, 4.2 and 4.3 transport the cut-to-length spine insert 1 to a roller applicator that is composed of a cloth cylinder 5 and an upper roller 6, in synchronism with cyclically infed cover boards 8. In this case, a blank to be covered 7, which is provided with an adhesive, is applied on the cover boards 8 and the spine insert 1, whereby the protruding sides of the blank to be covered 7 are folded and pressed against the upper sides of the cover boards 8 and the spine insert 1 in ensuing turn-in stations that are not illustrated in greater detail.
The pairs of feed rollers 4.1, 4.2 and 4.3 are collectively driven by a separate servomotor 13. In order to synchronously bring together the book case components, its drive controller 13a is permanently synchronized with a shaft encoder 15 that detects the rotational movement of the cloth cylinder 5. The infeed of the cover boards 8 is scanned with the aid of a light barrier 16 in order to trigger a cyclic transport stroke HZ for the spine insert 1.
The pairs of feed rollers 4.1, 4.2 and the 4.3 have a constant transport stroke HZ. The path curve 19 of the transport stroke HZ is illustrated in the motion diagram according to
The transport roller arrangement illustrated laterally adjacent to the motion diagram makes it clear that the spine insert 1 is only transported by the roller applicator itself after it emerges from the last pair of feed rollers 4.3 that is positioned at a distance B behind the roller applicator. The deceleration 19b at the end of the path curve 19 therefore no longer has any influence on the transport movement of the spine insert 1. Referred to the cycle time T, the transport stroke HZ takes place within a fixed infeed transport time tZ.
An ensuing spine insert 1 is drawn forward while the cut-to-length spine insert 1 is fed to the roller applicator. The transport stroke HS that is variable in accordance with the format length L ends at the same time as the transport stroke HZ of the infeed transport. The pairs of cut length transport rollers 3.1 and 3.2 that are collectively driven by a separate servomotor 12 with assigned drive controller 12a carry out the transport in synchronism with the pairs of feed rollers 4.1, 4.2 and 4.3.
In the motion diagram according to
A glance at the laterally illustrated transport roller arrangement makes it clear that the transport movement HS is synchronized with the transport movement HZ of the pairs of feed rollers 4.1, 4.2 and 4.3 in a first motion segment of the acceleration 20a, and that the material strip is subsequently introduced into the first pair of feed rollers 4.1 that is arranged upstream of the cutting device 9 by the distance A. The spine insert 1 is then collectively transported by the pairs of cut length transport rollers 3.1 and 3.2 and the pairs of feed rollers 4.1, 4.2 and 4.3, wherein the deceleration 20b in the path curve 20 of the cut length transport is also in synchronism with the deceleration 19b of the infeed transport after a motion segment of constant speed 20c.
In order to elucidate the variable transport stroke HS of the pairs of cut length transport rollers 3.1 and 3.2, another path curve 21 for the smallest format length LK and a path curve 22 for the greatest format are also in the motion diagram.
A cutting process is triggered as soon as the common transport movement of the pairs of cut length transport rollers 3.1 and 3.2 and of the pairs of feed rollers 4.1, 4.2 and 4.3 comes to standstill. In this respect, the motion diagram shows the valve control 17 of a pneumatic valve 11 that controls a pneumatic cylinder 10 for carrying out the cutting process back and forward between a cutting on 1 and a cutting off 0 position.
The infeed of a spine insert 1 to the roller applicator can be realized as soon as the spine insert was cut off the material strip. Since the spine insert is transported away from the cutting device 9 in this case, the cutting knife can still be situated in the cutting on 1 position. It does not have to be switched into the cutting off position until an ensuing spine insert 1 is drawn forward by the pairs of cut length transport rollers 3.1 and 3.2. According to the motion diagram shown in
The disclosed apparatus for the first time makes it possible to realize the above-described optimized motion sequence with a very short standstill time for cutting into lengths a spine insert 1 that was drawn forward. Due to the cutting process that takes place at a standstill, the cut-to-length spine inserts 1 have a very high cut length accuracy and can be fed to the roller applicator in rapid succession in order to realize a high output of book cases per cycle. The apparatus is characterized by a particularly clear and simple design. The servo motors 12 and 13 also make it possible to easily change the length and/or position of the spine insert 1 during the operation of a casemaker.
Number | Date | Country | Kind |
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DE 102006027903.4 | Jun 2006 | DE | national |