EP1156000A2 - Delivery station of a forming press - Google Patents

Abstract

The receiving station has a transverse roller ahead of the receiving zone and a moving carriage ahead of the roller (18) with multiple bars as a non-stop receiving grille. The carriage is guided longitudinally on a carrier (4,5), and carrier and roller are mounted in a vertically mobile chassis (1) suspended on chains (24) and driven by a motor (19) through a transmission shaft.

Description

The present invention relates to a press reception station for shaping of sheets of paper or cardboard with a transverse roller placed downstream of the reception area and a mobile carriage downstream of said roller, capable of receiving a plurality of bars to constitute a reception grid non-stop poses, said carriage being guided by a carrying device longitudinal direction.

The terms "upstream", "downstream", "longitudinal" and "transverse" are used here by reference to the direction of advancement of the sheets in the press.

In reception stations of the defined type of entry, the separation of poses consists, after shaping and complete ejection of waste, to break the attachment points between the poses of a sheet using a top tool male and a female lower tool mounted vertically one above the other in the sheet reception area. The upper tool consists pushing elements slightly smaller than the perimeter of the poses. The tool lower consists of longitudinal and transverse bars forming a grid corresponding to the perimeter of the poses. The poses fall through the meshes of this grid and stack in vertical stacks in the area of reception.

To form stacks of separate and stable poses under these tools, on reception station pallet, periodic inserting a stabilization sheet is necessary. So that this insert can be performed without requiring a concomitant shutdown of the production unit, we uses a device commonly known as a non-stop reception grid. This device comprises a carriage movable in the longitudinal direction of the press. The carriage has two transverse beams on which can be arranged in the longitudinal direction of the bars intended to constitute a grid non-stop reception of poses. Bars generally have a shape similar to a cane. Rod head can engage in a notch the trolley beam farthest from the receiving station and can be there fixed by screwing. The rod of the rod rests in an area fairly close to the head of the rod, on the second transverse beam of the carriage, and, in an area close to the other end of the rod, on a transverse roller located in the immediate vicinity and downstream of the poses reception area. For carry out an inserting maneuver, the mobile carriage moves to bring the bars under the lower blanking tool and a pair of bars come to support each pose which falls. For large poses surface, the number of bars per installation may be higher. The grid of non-stop reception momentarily receives the poses which pile up during inserting operations. After each inserting operation, the bars forming the grid withdraw from the reception area, by displacement longitudinal of the mobile carriage, crossing with vertical tool storers lower of separation of poses, to deposit the poses on the sheet inserting.

A preselector defines the number of cuts per packet inserted as well than the number of packages and / or the height of the stacks. All the device operates automatically and continuously according to a preprogrammed cycle.

One drawback of this non-stop receiving grid device is in the fact that the temporary storage height on the bars engaged in the reception area is only of the order of 35 mm. Now a cycle inserting takes about 20 to 30 seconds. The storage height is sufficient for thin or thin cardboard sheets grammage and for relatively slow processing speeds. For the fastest current production rates, as well as for sheets of relatively thick cardboard or repressed cardboard, this height of storage becomes insufficient. If the thickness of a new sheet of cardboard thin is around 3 tenths of a millimeter, this thickness increases up to 5 tenths or more, when it is driven back to achieve the folds of the cardboard. With a production rate of 3 sheets per second, the available storage height of 35 mm can be reached in about 20 seconds or less. To increase the time available for inserting, it has already been proposed to increase this storage height by placing the level of the non-stop grid below. But in this case, the precision of the removal of the poses is less good, especially in the case of small poses. With a width of less than 10 cm and with a doubled drop height, the poses fall across and the stacks are poorly formed.

The object of the present invention is to increase the storage capacity of poses on the receiving grid non-stop while maintaining the height of drop exposures to a minimum to ensure proper stack formation.

This goal is achieved in a reception station of the defined input type by the fact that the station includes lifting means producing the same vertical movement of the roller and the moving carriage, downwards, while poses accumulate on the reception grid.

Thanks to the lifting means according to the invention, the reception grid, placed on the mobile carriage and the roller, moves vertically towards the bottom while the poses accumulate on this grid during the operation inserting. The time available for the inserting cycle is found considerably elongated. The height of fall of the poses thus becomes adjustable, and the free fall height can be kept low, which is particularly advantageous for small poses.

According to one embodiment of the invention, the vertical displacement towards the bottom is pre-programmed according to the work carried out by the press, in particular depending on the thickness of the treated cardboard.

According to another embodiment, the vertical downward movement is subject to the detection of the top sheet of the stack resting on the grid reception.

The carrier of the mobile carriage and the cross roller can be mounted fixed in a vertically mobile chassis. In particular, the vertically movable frame can be a frame running across the entire width of the station, suspended on both sides by chains driven by a motor single via a drive shaft.

Preferably, the lifting means comprise means for correction and maintenance of the horizontality of the upper face of the bars constituting the non-stop reception grid. These means of correction can include side racks and guide rollers and / or torsion bars connecting distant portions of the vertically movable chassis.

The vertical stroke of the non-stop receiving grid can be adjustable between a high position, where preferably the height of fall is minimum, and a low position, this low position being determined by the length of the storers of the lower blanking tool.

This low position can be preprogrammed: the length of the the separators of the lower blanking tool is normally known and can therefore be entered in the programming of the machine. Instead of integrating this parameter in the program, we can also detect the position of the grid in relation to the storers. To do this, the vertically movable chassis can carry, upstream of the transverse roller, a scanning probe horizontally the space immediately below the ends free of the bars constituting the reception grid, to detect the height of the frame where the grid descends below the lower end of the racks.

• la figure 1 est une vue en élévation latérale d'un châssis traversant verticalement mobile;
• la figure 2 est une vue de dessus d'un dispositif détectant la position de la grille de réception par rapport aux rangeurs de la station.

Other features and advantages of the invention will appear to those skilled in the art from the description below of a particular embodiment, with reference to the drawing in which:

• Figure 1 is a side elevational view of a vertically movable through frame;
• FIG. 2 is a top view of a device detecting the position of the reception grid with respect to the station's rangers.

Figure 1 shows, in side elevation, a chassis 1 crossing with the means causing its vertical displacement. The chassis is composed of two horizontal longitudinal beams 3. These two beams are arranged at near the side walls, driver side (DC) and side opposite the conductor (c.o.c.) of the frame of the press reception station. Both horizontal longitudinal beams 3 are connected by at least one beam horizontal transverse 12 which connects the ends of the longitudinal beams horizontal 3 located near the reception area of the poses. To the other end of the horizontal longitudinal beams 3 are fixed two beams vertical 6. The two pairs of beams 3 and 6 have a configuration in L on both sides, c.c. and c.o.c. machine; the set made up of the 6 beams 3, 6, 11, 12 is rigid.

Each of the two longitudinal horizontal beams 3 bears on its vertical side facing the machine axis a set of rules horizontal longitudinal 4, 5 screwed in 2 on beams 3. Rules 4, 5 constitute rails carrying and guiding a mobile carriage. The mobile cart itself is not shown in Figure 1, but its drive system is shown in dashed lines. This training system includes a chain 13, the two ends of which are fixed to the mobile carriage, forming a closed loop. The chain 13 is stretched between a return wheel 14, located near the beam 12 and a return pinion 15 arranged at the upper end of the beam 6. A second chain 16 is arranged on the return pinion 15 and forms a closed loop, stretched at the end lower of the vertical beam 6 around a drive pinion 17, set movement by a motor mounted and fixed at this level on the vertical beam 6 and not shown in the figure. The assembly consisting of the motor, the pinion drive 17, chain 16, idler gear 15, chain 13 and of the idler 14 allows movement of the non-stop receiving grid between a rest position where the carriage is moved back near the vertical beams 6 and an insert position, where the mobile carriage is near the transverse beam 12. The two horizontal beams longitudinal 3 carry between them, at their end close to the beam transverse 12, a roller 18 on which rests and rolls the free end of the bars constituting the non-stop grid.

The vertical movement of the through frame 1 is ensured using a motor 19 secured to the frame of the press receiving station. The rotation of the motor 19 drives, via a chain 20 and a toothed pinion 21, the rotation of a horizontal and transverse transmission shaft 22, located in the lower part of the press frame. The drive shaft 22 carries to each of its ends a toothed pinion 23 setting in motion a chain 24, one end 25 of which is free and the other end 26 of which, after passage on a return pinion 27, is fixed to the lower end of a vertical beam 6. The rotation of the motor 19, in one direction or the other, causes the vertical displacement of the beams 6. The beams 6 are therefore suspended from chains 26. They are also kept suspended from proximity of the side walls of the receiving station frame thanks to two rollers 28 and 29 mounted on these walls by L-shaped fasteners

The use of a single engine and identical drive parts on both sides of the machine maintains the left / right horizontality of the chassis 1 during its vertical displacement.

The front / rear horizontality of beams 3, rails 4, 5 and, starting from mobile cart and receiving grid is provided on each side of the chassis 1, thanks to a horizontal and longitudinal torsion bar 8, which carries at its two ends two pinions 7, 30, identical, coaxial and integral with the torsion bar. The axis of the pinions and the bar, is carried by supports of axis 33, 32 integral with the beam 3. Each of the two pinions 7 and 30 meshes with a respective vertical rack 9, 10, integral with the wall of the press reception station structure. An initial adjustment of the position of the racks 9, 10 correct a defect in the horizontality of the non-stop grid. Torsion bar 8, which rotates while the through frame goes up or descends, maintains the front / rear horizontality of the assembly during this vertical movement of the chassis.

To limit the vertical stroke of the through frame, the walls of the frame of the press each carry a fixed stud 31, placed below the bar torsion 8 and against which this bar 8 would abut in the extreme position low. The two studs 31 constitute only a safety, because in normal operation, the through frame does not reach this position extreme low. The lowest position actually reached during a inserting cycle is determined by the length of the tool's rows lower of separation of poses. Indeed, the top of the reception grid poses must not descend below the height where is located the lower end of the stackers because otherwise, when removing the bars, the stacks would not be placed correctly on the insert sheet.

Figure 2 shows a device for detecting this position. On the right half of the figure is shown schematically the position of the tool lower of separation of poses.

Figure 2 shows the end of the chassis 1 crossing vertically mobile located near the reception area of the poses. We see there, seen from above, the end of the longitudinal horizontal beams 3, the beam transverse 12 and, shown in dashed lines, the roller 18. We also see at the top of FIG. 2 the return wheel 14.

The beam 12 carries on its side located opposite the reception area of put an arm 34 articulated around a vertical axis 36. The rotation is controlled by a pneumatic cylinder 35 articulated at one of its ends at the beam 12 and at its other end to the arm 34, near the axis of rotation 36. Thanks to this arrangement, the arm 34 can describe a rotational movement in a horizontal plane. The arm 34 may or may not describe what movement, according to whether it does not meet a ranger or according to, that on the contrary, the movement is blocked by the meeting of the lower end of a ranger. The movement, or blocking of the movement, is detected by a in a manner known per se, for example by a contact sensor.

Claims (7)

Station for receiving presses for shaping sheets of paper or cardboard with a transverse roller (18) placed downstream of the reception area and a movable carriage downstream of said roller, capable of receiving a plurality of bars to form a reception grid non-stop laying, said carriage being guided by a support device (4, 5) in the longitudinal direction, characterized in that the station comprises lifting means (1, 19 to 27) capable of producing the same vertical displacement of said roller and of said movable carriage, downwards, while poses accumulate on said reception grid. Station according to claim 1, characterized in that the lifting means (1, 19 to 27) are preprogrammed according to the work of shaping said sheets of paper or cardboard. Station according to claim 1, characterized in that the lifting means (1, 19 to 27) are slaved to the detection of the poses accumulated on said reception grid. Station according to any one of claims 1 to 3, characterized in that said carrier device (4, 5) of the mobile carriage and the transverse roller (18) are fixedly mounted in a vertically mobile chassis (1). Station according to claim 4, characterized in that said chassis (1) is a through chassis, comprising means for correcting and maintaining the horizontality (7, 8, 9, 10, 22, 24, 30) of the face upper bars constituting the non-stop grid, whose vertical movement is controlled by a single motor (19). Station according to any one of the preceding claims, characterized in that the vertical stroke of the receiving grid is adjustable between a high position and a low position, said low position being determined by the length of the rows of the lower separation tool of poses. Station according to claim 7, characterized in that the frame (1) carries, upstream of the transverse roller (18), a feeler device (34) horizontally scanning the space located below the free ends of the bars constituting the receiving grid , to detect the height of the chassis where the receiving grid descends below the lower end of the racks.

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