DE102015004857A1 - Method and device for loading a three-knife cutting machine with material to be cut - Google Patents

Abstract

Method for loading a three-knife cutting machine with material to be cut or stacks of products from a feed conveyor arranged behind one another transported bound book blocks, brochures or magazines, wherein the thickness of the material to be cut measured in the region of a feed conveyor and the control of the device is transmitted and an apparatus for performing the method with a first Measuring device for detecting the thickness of the material to be cut.

Description

The present invention relates to a method for loading a Dreimesserschneidemaschine with items to be cut or Schneidgutstapeln from bound book blocks, brochures or magazines according to the preamble of claim 1 and an apparatus according to the preamble of claim 9 for performing the method.

A three-knife trimmer is used to trimming the three unbonded edges of book blocks, brochures or magazines. These receive their final format. The three-knife cutting machine works by working in an oblique cut against cutting edges side and front knife on the knife cutting principle, the three-side trimming is realized in a cutting station. For this purpose, the book blocks are fixed on the cutting table by a press ram under pressure and the side and the front trim made by phase-shifted knife movements. The products can be processed individually or in a stack with a maximum stacking height of up to 80 mm.

The three-knife trimmer is often coupled in a flow line with an adhesive line or book production line. The supply and removal of the products takes place automatically via conveyor belts. To compensate for the differences in performance of the coupled machines, the three-knife cutting machine is preceded by a pre-stacking device. From the EP 0 887 157 A2 For example, there is known a pre-stacking device for a three-knife cutting machine provided with a magazine having two divided, horizontally movable magazine trays for opening and closing, the upper tray intermediate tray forming a counted book block stack and the lower magazine tray for ejecting the formed stack onto a feed tray is provided.

Known pre-stacking devices can be operated both in magazine and count-stack operation. In count-stack mode, the book blocks are individually and photoelectrically counted in the upper magazine section. After reaching the preselected number, the stack is deposited by opening the upper magazine subsoil on the underlying magazine base and from there delivered in tact to the tray for pushing out and feeding the stack in the introduction of the three-knife cutting machine. The count-stack operation is particularly suitable for processing thin (up to about 5 mm thick) and sensitive book blocks. Switching off the magazine shelves switches to magazine mode. Inserted book blocks (from approx. 5 mm thick) fall in the magazine directly onto the underlying storage table. A height adjustable stacker determines the stack height and transports the book block stack into the feeder of the three knife cutting machine. The magazine operation is also suitable for supplied in the scale flow book block corresponding book block thickness.

In order to increase the feeding performance, especially for thin products, is in the EP 1 477 445 A1 an acceleration conveyor arranged between a feed conveyor and the pre-stacking device, in front of which an acceleration roller and at least one conveyor belt extending forwardly to the magazine and a pressure roller arranged above the acceleration roller and controlled by a pneumatic cylinder can be moved up and down. For a safe transport of the products, an upper end position of the pressure roller is required, in which the product can be conveyed under the pressure roller, without being burdened by this. In the lower end position, the pressure roller must prevent unwanted slippage of the product relative to the acceleration roller.

More and more small and very small runs are processed to a single copy, so that the thicknesses of the three-knife cutting machine successively supplied products vary greatly. This results in that the pressure roller of the known devices in each up and down movement must provide for processing the expected smallest and largest product thicknesses and the pressure roller springs in accordance with the actual existing product thickness in the pneumatic cylinder. With a large expected thickness range, this leads to correspondingly long-lasting up and down movements of the pressure roller and corresponding power limitation of the device, since the movement speed can not be increased arbitrarily.

The object of the invention is therefore to provide a method of the type mentioned and an apparatus for its implementation, which are exempt from the disadvantages mentioned.

The invention achieves the object by a method having the features of patent claim 1 and by a device having the features of patent claim 9.

Advantageous developments of the invention are characterized by the features specified in the subclaims.

An exemplary embodiment of the method according to the invention and the Device according to the invention will be described in detail with reference to FIGS. Show it:

1 a device for loading a Dreimesserschneidemaschine schematically in plan view;

2 a device for loading a Dreimesserschneidemaschine schematically in a side view;

3 an acceleration conveyor in perspective view.

In the 1 shown inventive device for loading a three-knife cutting machine with material to be cut 49 . 50 . 51 . 52 includes a feed conveyor 6 with a conveyor belt 44 , which with a first speed v (z) continuously operable in any order successively arranged cutting materials 49 . 50 different thicknesses as a product flow an acceleration conveyor 5 the device promotes. The on the conveyor belt 44 lying transported cut goods 49 . 50 can each have different distances d.

Downstream of the feed conveyor 6 is an acceleration conveyor 5 arranged, which in each case a copy Schneidgut 49 . 50 from the feed conveyor 6 takes over and with a variable second speed v (b) in the stacking shaft 9 a downstream stacker 3 promotes. This includes the acceleration conveyor 5 a lower accelerator 11 and an upper accelerator 12 , which together form a conveyor gap 16 form, in which the cutting material 49 . 50 from the lower accelerator 11 and the upper accelerator 12 be collectively recognized.

The stacking shaft 9 the stacking device 3 divided into an upper area, in which on through the stacking shaft 9 protruding and movable out of this by pivoting p finger 10 formed magazine grounds 45 the individually supplied material to be cut 49 . 50 as Schneidgutteilstapel 52 collected and upon reaching the desired height or range of height of the cutting material stack 52 by moving out the fingers 10 from the stacking shaft 9 the complete cutlery stack 51 transferred to the lower area and on the storage table 46 provided. The storage table 46 is so disrupted that it comes from a pusher 47 is traversed in a horizontal insertion direction e, whereby the cut material stack 51 in the importing device 2 the three-knife cutting machine and then in the cutting device 1 with the front knife 7 , the side knives 8th and associated pressing elements such as the ram 58 is transported. The pusher 47 is linearly movable from one below the tray table 46 arranged drive 48 cyclically alternately driven.

The lower accelerator 11 of the acceleration conveyor 5 includes as in 3 shown a transport roller 14 and several in grooves of the transport roller 14 running straps 13 , The transport roller 14 and the pulleys 56 the belt 13 are in a common frame 17 arranged such that the conveying effective area of the lower accelerator 11 and the work of the conveyor belt 44 lie in a common plane. The length of the straps 13 in the feed z is chosen so that the material to be cut 49 . 50 safely held by the accelerator as soon as it reaches the feed conveyor 6 has completely left.

The upper accelerator 12 includes a role 15 , which are parallel to the transport roller 14 and is arranged above this. The role 15 the upper accelerator 12 and the transport roller 14 the lower accelerator 11 together form the conveyor gap 16 , For setting the conveying gap 16 on different product thicknesses, is the role 15 normal to the plane of movement of the material to be cut 49 . 50 movable with the frame 25 the upper accelerator 12 connected. The positioning of the roll 15 in direction a of the conveying gap (cf. 2 ) takes place via a delivery device 23 with a linear guide 26 and a parallel to this spindle drive 27 , The spindle drive 27 is with a stationary adjustment drive 28 drive-connected, which comprises a motor and a rotary encoder system and from the controller 43 the device is controlled, including adjustment 28 and control 43 via a data line 39 connected to each other. The encoder system of the adjustment drive 28 provides the controller 43 Information, which as the opening width of the conveying gap 16 can be interpreted, so that about the adjustment 28 a position control of the role 15 he follows.

The role 15 is via a pivot lever 29 with the spindle drive 27 connected, which pivoting the role 15 around the axis parallel to it 30 allows the adjustment of the conveying gap 16 through the spindle drive 27 superimposed. To swing the pivot lever 29 through a pneumatic cylinder 32 operated, with which he by the lever 31 connected to compensate for the angle error. The pneumatic cylinder 32 is via compressed air lines 37 from a switchable valve 38 supplied with compressed air. The valve 38 is over a line 55 from the controller 43 the device driven. Lowering the roll 15 by Actuation of the pneumatic cylinder 32 and thus by pivoting about the axis 30 is thus force-controlled.

To shifts within the material to be cut 49 . 50 and damage to its surfaces by different conveying speeds of the lower accelerator 11 on the one hand and the upper accelerator 12 On the other hand, to avoid are the lower accelerator 11 and the upper accelerator 12 with a common drive 33 drive connected, so that in a simple manner a synchronous run is ensured. By both the transport roller 14 the lower accelerator 11 as well as the role 15 the upper accelerator 12 are driven, the cutting material can 49 . 50 be accelerated and delayed without risking quality losses. As drive connection, the upper accelerator means 12 a belt 19 on which the transport roller 14 the lower accelerator 11 and one above the roll 15 the upper accelerator 12 arranged pulley 20 wraps around and on the outside of the drive of the role 15 is tapped, so that the drive connection regardless of the by the delivery device 23 predetermined position of the roll 15 he follows. The pulley 20 is at a lever 21 arranged and is by a tension spring 22 curious; excited. The drive 33 is controllable and via a line 42 with the controller 43 connected to the device.

The acceleration conveyor 5 has a photocell 36 on which the presence of cutting material 49 . 50 in the conveyor gap 16 detected. It is immediately downstream of the roll 15 fixed above the product stream. The detuning over a signal line 40 with the controller 43 connected light barrier 36 indicates the leading edge or the trailing edge of the material to be cut 49 . 50 what the controller 43 the position of the detected material to be cut 49 . 50 determined relative to the machine cycle of Dreimesserschneideeinrichtung.

The device according to the invention comprises a first measuring device 34 indicating the thickness of the feed conveyor 6 transported material to be cut 49 . 50 detected. A data line 41 connects the first measuring device 35 with the controller 43 , which on the basis of these measured values a default setting of the conveying gap 16 through the adjustment drive 28 the delivery device 23 controls. In this case, the conveying gap 16 slightly further than the measured product thickness adjusted to a trouble-free conveying the material to be cut 49 . 50 into the conveyor gap 16 sure. This presetting is done after the photocell 36 through the trailing edge of the previous in the conveying gap 16 located cutting material 49 was detuned, indicating that there was no product in the conveyor nip 16 located.

To direct repercussions of the first measuring device 34 on the cutting material 49 . 50 To avoid, the measurement takes place without contact, including the first measuring device 34 has an ultrasonic sensor. By the sensor in the product gap its distance to the conveyor belt 44 the feed conveyor 6 measures, it is before each measurement of the material to be cut 49 . 50 calibrated, whereby the measurement error can be minimized.

After the role 15 the specific position reached and the photocell 36 the leading edge of the respective subsequent product 50 has captured the role 15 by pressing the pneumatic cylinder 32 with a pre-set by the air pressure force in the conveying gap 16 located cutting material 50 lowered and thus the respective cutting material 50 funded by the acceleration conveyor 5 detected.

To damage the cut material 49 . 50 to avoid are the first transport speed v (z) of the feed conveyor 6 and the second transport speed v (b) of the acceleration conveyor 5 the same, as long as the cutting material 49 . 50 simultaneously from both sponsors 5 . 6 is recognized as an aid. Once the cut 49 . 50 only from the acceleration conveyor 5 is conveyed effective, its transport speed v (b) depends on the degree of filling of the stacking shaft, the thickness w of in the acceleration conveyor 5 located leading cutting material 49 and its distance d to that subsequent to the feed conveyor 6 transported trailing crops 50 from the controller 43 adapted to the device. In this case, the acceleration conveyor 5 also temporarily come to a standstill, ie its transport speed v (b) assume the value zero.

The acceleration conveyor 5 includes a second measuring device 24 which is independent of the return of the delivery device 23 the position of the roll 15 and thus the opening width of the conveying gap 16 with a stationary sensor 53 recorded and the measured measure via a data line 54 the controller 43 transmitted to the device. As a sensor 53 a magnetic field sensor is used, which is a magnetic tape 57 detected in the direction a of the conveyor gap 16 movable and with the roller 15 connected is.

Is cutting good 49 . 50 in the conveyor gap 16 and is the role 15 through the pneumatic cylinder 32 on the cutting material 49 . 50 lowered, that is from the second measuring device 24 recorded dimension of conveyor gap 16 identical to the thickness w of the pressed material with defined pressure 49 . 50 , This measured thickness w of the material to be cut 49 . 50 is from the controller 43 the device for determining the height of the stack in the shaft 9 located Schneidgutteilstapels 52 and for adjusting downstream of the upper accelerator 12 arranged facilities on the height of the material to be cut ( 49 . 50 ) or the cutting material stack 51 , in particular the adaptation of the motion profiles of the pressing device 58 and the knife 7 . 8th the cutting device 1 used. The adaptation of the movement profiles is carried out for each cutting cycle of the cutting device 1 based on the available data.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 0887157 A2 [0003]
• EP 1477445 A1 [0005]

Claims (14)

Method for loading a three-knife cutting machine with material to be cut ( 49 . 50 ) or chopped stacks ( 51 ) of bound book blocks, brochures or periodicals, whereby • cuttings arranged one behind the other ( 49 . 50 ) at a first constant speed (v (z)) by a feed conveyor ( 6 ) an acceleration conveyor ( 5 ), which has a variable conveying gap ( 16 ) forming pairwise transport elements ( 13 . 14 . 15 ) of the acceleration conveyor ( 5 ) one each from the feed conveyor ( 6 ) supplied cutting material ( 49 . 50 ) and with a variable second speed (v (b) of a stacking device ( 3 ), • through the stacking device ( 3 ) a cut product stack ( 51 ) predetermined height and via an introduction device ( 2 ) of the cutting device ( 1 ) the three-knife cutting machine is fed cyclically, characterized in that the extension (w) of the material to be cut ( 49 . 50 ) in the direction (a) of the conveying gap ( 16 ) in the area of the feed conveyor ( 6 ) by a first measuring device ( 34 ) and the at least the acceleration conveyor ( 5 ) controlling control ( 43 ) is transmitted. Method according to claim 1, characterized in that the conveying gap ( 16 ) of the acceleration conveyor ( 5 ) corresponding to that of the first measuring device ( 34 ) detected extent (w) of the following of the acceleration conveyor ( 5 ) to be detected 50 ) is set after the leading cutting material ( 49 ) at least the conveying gap ( 16 ) of the acceleration conveyor ( 5 ) and before the trailing food ( 50 ) the conveying gap ( 16 ) has reached. Method according to claim 1 or 2, characterized in that the expansion (w) of the material to be cut ( 49 . 50 ) in the direction (a) of the conveying gap ( 16 ) is detected without contact. Method according to one of claims 1 to 3, characterized in that the setting of the conveying gap ( 16 ) force-controlled, while the sliced ( 49 . 50 ) in the conveying gap ( 16 ) is located. Method according to one of the preceding claims, characterized in that during the force control of the conveying gap ( 16 ) the thickness (w) of the in the conveying gap ( 16 ) cutting material ( 49 . 50 ) and the controller ( 43 ) is transmitted to the three-knife cutting machine. Method according to one of the preceding claims, characterized in that the controller ( 43 ) the height of the stacking device ( 3 ) located Schneidgutteilstapels ( 52 ) from the individually measured thicknesses (w) of the material to be cut ( 49 . 50 ) certainly. Method according to one of the preceding claims, characterized in that format settings and movement profiles of the three-knife cutting machine on the basis of the measured thickness (w) of the material to be cut ( 49 . 50 ) or by the controller ( 43 ) certain height of the cut material stack ( 52 ) are determined per cutting cycle. Method according to one of the preceding claims, characterized in that the controller ( 43 ) based on the thickness (w) of the stacking device ( 3 ) to be fed subsequently ( 49 . 50 ) and the height of the stacking device ( 3 ) located Schneidgutteilstapels ( 52 ) the time of feeding the material to be cut ( 49 . 50 ) from the acceleration conveyor ( 5 ) in the stacking device ( 3 ) certainly. Device for loading a three-knife cutting machine with material to be cut ( 49 . 50 ) or chopped stacks ( 51 ) of bound book blocks, brochures or periodicals with at least one infeed conveyor ( 6 ) from a conveyor belt which can be driven continuously at a first speed (v (z)) ( 44 ), One in the conveying direction (z) to the feed conveyor (z) 6 ) following and with a second, variable speed (v (b)) drivable acceleration conveyor ( 5 ), with two together a conveying gap ( 16 ) forming, circulating transport elements ( 14 . 15 ) and with one with at least one of the conveying gap ( 16 ) forming transport elements ( 14 . 15 ), controlled delivery device ( 23 ) for changing the conveying gap ( 16 ), • one in the stacking device ( 3 ) with a stacking shaft ( 9 ), • a pusher ( 47 ) for isochronous feeding of the stack of products ( 51 ) from the stacking shaft ( 9 ) into the import facility ( 2 ) of the three-knife cutting machine, characterized by an upstream of the acceleration conveyor ( 5 ) arranged first measuring device ( 34 ) for detecting the extent (w) of the material to be cut ( 49 . 50 ) in the direction (a) of the conveying gap ( 16 ). Apparatus according to claim 9, characterized in that the first measuring device ( 34 ) a sensor ( 35 ) for contactless distance measurement. Apparatus according to claim 9 or 10, characterized by a position-controlled as well as force-controlled operable delivery device ( 23 ) for changing the conveying gap ( 16 ). Device according to one of claims 9 to 11, characterized in that the acceleration conveyor ( 5 ) a second measuring device ( 24 ) for detecting the thickness (w) of the material to be cut in the conveying gap ( 16 ) of the acceleration conveyor ( 5 ). Apparatus according to claim 12, characterized in that the second measuring device ( 24 ) a sensor ( 53 ) for detecting the opening width of the conveying gap ( 16 ). Apparatus according to claim 12 or 13, characterized in that the second measuring device ( 24 ) together with the delivery facility ( 23 ) and the conveying gap ( 16 ) forming transport element ( 15 ) Magnetic tape ( 57 ) and as a sensor ( 53 ) a magnetic tape ( 57 ) Magnetic field sensor includes.

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