EP0631957B1 - Apparatus for cutting lengths of a backlining and assembling it with top layer for the mechanical production of book backs - Google Patents

Description

The invention relates to a device for cutting sections of a from a stock roll that runs off the back insert and for precise positioning with supplied cardboard in a rolling device for the mechanical production of book covers with a pair of cut length transport rollers for pulling the back insert in and positioning it in a cutting device and with a series of pairs of feed rollers to feed the cut to length Back insert through a transport channel into the rolling device.

Book cover machines are used in the industrial production of book covers for use with discontinuous or continuous devices to cut the back insert, also called Schrenz.

In known trigger devices running in step mode, one finds the respective section length adjustable link drive system for control the means of transport with the interposition of a freewheel. The tensile force for cutting to length acts directly on the supply roll, with the consequence that their moment of inertia must always be overcome in order to to stop the roller from rotating again. Because of the changing diameter results in different tensile forces, which leads to slippage and thus to inaccuracies in the section length. To overcome the moment of inertia with supply rolls with a large diameter there is also the risk of tearing off with narrow, thin Schrenzmaterial.

The trigger devices that operate with a link drive system and free-running mechanism are with regard to an increase in the number of cycles due to the constantly changing direction of movement Set limits.

There are also deduction devices in book cover machines with a continuous ongoing roll unrolling with a barrier material from a supply roll pre-transporting suction wheel known. To cut the Schrenzmaterial is a cross cutting device with a pair all around driven inclined cross cutting knives.

The rotating cross-cutting knives always require an exact match of yours Drive depending on the respective take-off speed and take-off length, which can only be achieved with a great deal of construction. Basically, there remains the danger of the string length inaccuracy and one not right-angled cutting of the barrier material. Not least length inaccuracy due to the non-slip-free transport of the Suction wheel occur.

The continuously operating extraction devices with rotating cutting devices also require a not inconsiderable conversion effort, what only to be carried out by trained personnel.

From DE-OS 36 14 167 a device is known in which for the machine Manufacture of book covers, the back insert is pulled off a supply roll, cut to length by a cross cutter and a blanket cylinder of the book cover machine is fed. To achieve higher Cutting length accuracy, the cutting process takes place between two transport steps, why a cutting length gear to drive one in front of Cutting device installed transport roller system is provided, the Range of constant rotary movement by rotatably arranged relative to each other Cam discs adjustable according to the section length of the material is.

As is known, the cut length is fed to the blank cylinder in a conveyor channel by means of a transport roller system consisting of spaced mutually arranged pairs of rollers by a Schrenztransportträger to be put into circulation.

Cut length gearboxes and crossfeed gearboxes are characterized by a multitude of drive elements interconnected. Such a forced coupling Two motion sequences with mechanical components can cause tolerance errors be afflicted, which result from manufacturing inaccuracies, what in particular the cutting length accuracy and the accuracy when merging of the barrier with the cardboard at high cycle rates.

U.S. Patent 4,149,484 discloses a section cutting device a web with a pair of transport rollers, a pair of feed rollers a cutting device and a pair of transfer rollers. The bottom one Rollers are constant from one motor via a gear arrangement with the same Angular speed driven while the top rollers are free rotate. The driven transport roller and feed roller have a protruding one Cam on which to convey the web with the upper freely rotatable total cylindrical roller is brought into operative connection, the conveyor line each exactly corresponds to the developed length of the cam. The Knife of the cutting device can be moved up and down vertically and serves at the same time as an import ban for the web advanced by the pair of transport rollers. The Feed roller pair takes the web to it over one of the unwound To convey the length of the cam corresponding distance. The one from the cutter severed section of the web passes into the takeover roller pair for forwarding to a vacuum cylinder that guides the section past on a glue application roller on a supplied carrier material.

For setting a shorter section length and for readjustment in case of deviation of the set section length is the driven feed roller coupled with an actuating mechanism to be actuated by a handwheel. Here there is an angular adjustment of the feed roller with respect to the takeover roller so that the contact line between the takeover roller pair and the Front edge of the web moves. The manual readjustment can be made during of the work process.

The object of the invention is a device of the generic type Art to create high performance ceiling machines with the highest Cutting length accuracy and a precise positioning of the back insert and ceiling cardboard with high functional reliability.

To achieve this object, the device according to the invention is characterized in that that the cut length feed roller pair and the feed roller pairs cyclically driven by a common controlled servo motor and the cut length transport rollers after reaching a defined take-off length the back insert can be brought into an ineffective state that the cutting device is assigned a clamping device holding the back insert and that control means for positioning the cut back insert in a waiting position in the transport channel and to release the cut to length Back insert in timed coordination with the periodically added Blankets of cardboard and a control device for permanent adjustment of the drive of the servo motor with the movement of the cardboard are provided as a master drive.

An embodiment of the invention is based on schematic representations the construction of the device in different phases explained in Figures 1 to 3.

A conveyor system for the back insert 1, also referred to as a Schrenz of a transport channel 2 and a series of spaced apart Transport roller pairs 3-6 formed, with the task of the back insert 1 in a rolling device, consisting of a so-called blank cylinder 7 and with an upper roller 8, to promote, in which the back insert 1 is precisely positioned is brought together with supplied cardboard sheets 1a.

A cutting device 9 is arranged downstream of the first pair of transport rollers 3 and one installed between this and the pair of rollers 3, the one to be cut to length Back insert 1 holding clamping device 10. Cutting and clamping device 9 and 10 are coupled together and are known by pneumatic drive means 11 actuated.

According to the invention, the cutting device 9 and the clamping device 10 upstream first pair of transport rollers 3 for cutting the back insert 1 from a supply roll, not shown, hereinafter as cut length transport rollers designated, and the downstream pairs of transport rollers 4-6, hereinafter referred to as feed transport rollers, cyclically from a common one regulated servo motor 12 driven by a chain 13, one each Roller directly coupled to the servo motor 12 via the chain 13 and the opposite roller is carried by friction.

While the opposite rollers of the feed transport rollers 4-6 are permanent are driven with the pair of cut length transport rollers 3 an interruption of the conveying movement of the back insert 1 instead, what by Distance change takes place by the opposite roller 3b from the directly driven continuous roller 3a, operated by the pneumatic Drive means 11 is separated. Driving the roller 3b for interruption the back insert is fed after reaching a defined one Trigger length in coordination with the feeding of the back insert 1 and the supplied cardboard sheets 1a into the curling device 7, 8.

A synchronous running of the back insert 1 with respect to the blankets 1a a precise merging is carried out via a control device permanent adjustment achieved by the movement of the cardboard sheets as Master drive via a measuring device consisting of a driver 15 and an incremental encoder 16, and the result is recorded by an electronic drive controller 17 for controlling the servo motor 12 is supplied.

The sequence of movements of the device according to the invention for cutting sections a back insert and for precise positioning with The blankets of cardboard result as follows:

Cut the back insert 1 from a supply roll and position it to the cut length through cut length transport roller pair 3 and import transport roller pair 4 in position "Z". Clamp the back insert 1, open the Cutting length transport roller pair 3 and separating the back insert 1 (Fig. 1). Position the cut back insert 1 by pairs of feed rollers 4-6 on waiting position "W" (Fig. 2). Querying the leading edge of the supplied cardboard sheets 1a via light barrier 14 and synchronous promotion of Back insert 1 and cover cardboard 1a in rolling device 7, 8 via position control of back insert front edge and cardboard front edge and simultaneous Feed a following back insert 1 to position "Z" after closing the Cut length transport rollers 3a, 3b, opening the cutting device 9 and Clamping device 10 (Fig. 3).

Claims (2)

1. Apparatus for cutting to length portions of a spine insert (1) running off a supply reel, and for bringing them together, in a positionally accurate manner, with cover boards (1a) which are fed in, in a roller applicator (7, 8) for the mechanised manufacture of book covers, the said apparatus having a pair (3) of cut length transport rollers for drawing the said spine insert forward and positioning it in a cutting device (9), and a series of pairs (4-6) of lead-in rollers for conveying the cut-to-length spine insert through a transport channel (2) and into the roller applicator, characterised in that the pair (3) of cut length transport rollers and the pairs (4-6) of lead-in rollers can be driven cyclically by a jointly regulated servomotor (12) and the cut length transport rollers (3a, 3b) can be brought, after a defined drawing-off length of the spine insert (1) has been reached, into an ineffective condition, that a clamping device (10) which holds the spine insert (1) is assigned to the cutting device (9) and that there are provided control means (14, 17) for positioning the cut-to-length spine insert (1) in a waiting position in the transport channel (2) and for releasing the said cut-to-length spine insert (1) in synchronism with the cover boards (1a) which are fed in cyclically, and a regulating device (15-17) for continuously balancing the drive of the servomotor (12) with the movement of the cover boards (1a) as a master drive.
2. Apparatus according to claim 1, characterised in that the pair (3) of cut length transport rollers is formed by a roller (3a), which is directly driven by the servo motor (12), and by a roller (3b) which is driven, together with the said roller (3a), by frictional contact and the distance of which from the opposing roller (3a) can be varied via actuating means (11) for the purpose of transferring it into the ineffective condition.

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