EP0665722B1 - Method and device for conveying sheet-type workpieces - Google Patents

Description

The invention relates to a method for the discontinuous pre-conveying of two-dimensional workpieces, especially those to be glued together Fabric parts, to a follow-up conveyor in a three-step cycle, where in the course of a work cycle during the first step in shutdown state of the pre-conveyor in its placement area at least one workpiece is placed on the conveyor track, in which in the second step the pre-conveyor put into operation and the workpiece placed is moved to the subsequent conveyor and in the third step to complete this work cycle Hand over the workpiece to the subsequent conveyor and the pre-conveyor is stopped again.

The invention further relates to an arrangement for discontinuous pre-conveying of flat workpieces, in particular for feeding stacked parts Fabric parts to a gluing device.

Methods and arrangements for carrying out the described type are for example known from the literature DE 39 15 091 A1 and DE G 92 01 200.0. Straight when feeding material parts to be glued together, for example one Outer fabric cut and an insert cut to be glued to this must be the initially only superimposed parts of fabric, hereinafter referred to as the workpiece their gluing of a continuously operating fixing press on the input side be handed over. The perfect placement of the workpieces on a conveyor belt is however, especially when it comes to large parts, only possible if the conveyor belt is stationary during the laying process. In other words, they can Workpieces to be glued to one another do not directly affect the continuously moving conveyor belt which leads the workpieces through the bonding device be put on. It is therefore used for feeding the workpieces to the gluing device made use of a pre-conveyor and an intermediate conveyor, which are arranged one behind the other in the conveying direction of the bonding device. Here can now, when the pre-conveyor is stopped, the workpiece on its conveyor belt be placed and then over the pre-conveyor and the intermediate conveyor be handed over to the conveyor belt of the bonding device. For better Utilization of the bonding device can be carried out on its input side in parallel to each other Arrangement can also be provided two intermediate conveyors. Furthermore, a Pre-conveyor can be provided for more than one lay-on workplace.

This known solution for feeding workpieces to a gluing device force arrangements that are relatively long in the direction of conveyance of the workpieces exhibit and thus allow little adaptation to predetermined spaces. Furthermore, this solution is also technically complex because it always comes from intermediate conveyors Must make use of.

The invention is based, for a method described in the introduction, the task Type as well as for an arrangement for discontinuous pre-feeding of flat workpieces to provide a further solution in which the mutual spatial arrangement of Pre-conveyor and follow-up conveyor can be freely selected and in addition, when feeding from workpieces to a gluing device also dispensed with intermediate conveyors can be.

This object is achieved according to the invention in terms of the method by the Features specified in claim 1 and with regard to the arrangement by the in the claim 5 specified features solved.

The invention is based on the essential finding that the extension of the conveyor track of the pre-conveyor in the manner according to the invention not just any spatial Allocation of upstream and downstream conveyors allows, but also the possibility there, the pre-conveyor already while placing the on his conveyor belt moved workpiece on the conveyor belt of the subsequent conveyor again for placing to use another workpiece.

Further advantageous embodiments of the method are in claims 2 to 4 and the arrangement specified in claims 6 to 14.

A stacking device already exists through the literature reference DE G 73 17 511 known from a stacking table and a feeder arranged above, in which both the feeder and the stacking table can be moved in parallel guides are supported. This leads to the stacking of fabric parts on the stacking table Stacking table and the feeder at the same time a uniform but opposite movement whose speed is equal to the conveying speed of the feeder. Here too, the feeder extends its length when moving a piece of fabric in the direction of conveyance Conveyor track and shortened it again for the purpose of handing over the process Fabric on the stacking table. However, this known feeder is only for a continuous one Conveyor operation suitable, so it does not allow placing a workpiece on his conveyor belt in its stopped state with simultaneous shortening again its conveyor track length opposite to the conveying direction.

Fig. 1 bis 4

eine Erläuterung des Verfahrens anhand schematischer Darstellungen von Vor- und Folgeförderer,

Fig. 5

ein nähere Einzelheiten aufweisender Vorförderer einschließlich Folgeförderer nach den Fig. 1 bis 4,

Fig. 6

die Aufsicht auf Vorförderer und Folgeförderer nach Fig. 5,

Fig. 7

der Vorförderer nach den Fig. 5 und 6 in perspektivischer Ansicht ohne Förderband,

Fig. 8 und 9

den Seilantrieb des Schlittens des Vorförderers nach den Fig. 5 bis 7 erläuternde schematische Darstellungen,

Fig. 10

eine Anordnung für die Zuführung von Werkstücken an eine Verklebevorrichtung mit zwei Auflegearbeitsplätzen unter Verzicht auf Zwischenförderer,

Fig 11

eine Anordnung für die Zuführung von Werkstücken an eine Verklebevorrichtung mit vier Auflegearbeitsplätzen unter Verwendung von Zwischenförderern.

The invention will now be explained in more detail below with the aid of schematic representations and with the aid of the exemplary embodiments shown. Mean in the drawing

1 to 4

an explanation of the method based on schematic representations of feeders and followers,

Fig. 5

a more detailed pre-conveyor including subsequent conveyor according to FIGS. 1 to 4,

Fig. 6

the supervision of pre-conveyor and subsequent conveyor according to FIG. 5,

Fig. 7

5 and 6 in a perspective view without a conveyor belt,

8 and 9

the cable drive of the carriage of the pre-conveyor according to FIGS. 5 to 7 explanatory diagrams,

Fig. 10

an arrangement for feeding workpieces to a gluing device with two lay-on workplaces without intermediate conveyors,

Fig. 11

an arrangement for feeding workpieces to a bonding device with four lay-on workstations using intermediate conveyors.

1 to 4, 1 is a pre-conveyor and 2 is a follow-up conveyor. The pre-conveyor 1 and the subsequent conveyor 2 are arranged so that they with their conveying directions are aligned perpendicular to each other. In the case of the following conveyor 2, the stand is 21 and the endless conveyor belt designated 4. The pre-conveyor 1 has a table-like Stand 11 with two mutually parallel side walls 111 and an over Rolled endless conveyor belt 3 on. The roller 5 designed as a drive roller performs the belt deflection by 180 degrees at the rear end of the conveyor track. The The belt is also deflected by 180 degrees at the front end of the conveyor track a slidable in the conveying direction 6 with a ramp-like profile having carriage head 60. The endless conveyor belt 3 is in its running area against the conveying direction of the pre-conveyor 1 via belt deflection rollers 8 and 9 into one the slider movement enables variable size loop memory 7 designed. To this end, between the same amount in a predetermined mutual Distance arranged belt deflection rollers 8 and 9, a dancer roll 10 is provided the conveyor belt 3 over the belt deflection rollers 8 and 9 down to one always taut ribbon loop forms.

The lay-on workplace, not specified, is through the rear end of the conveyor track of the pre-conveyor 1 determined. On the conveyor belt 3 on the side of the roller 5 can in each case in its inoperative state, a workpiece 12 which, for example, consists of two one above the other stored pieces of fabric is to be put on. This is the first work step of the three work steps to be carried out in one work cycle Pre-conveyor 1. This first step is shown in Fig. 1. The sled 6, the with its carriage head 60 determines the front edge of the conveyor track immediately before the start of the conveyor belt 3 on the right belt above the conveyor belt 4 of the subsequent conveyor 2.

If the workpiece 12 is placed on the conveyor belt 3, it does not set in FIGS. 1 to 4 shown operator the pre-conveyor 1 for performing the second step in motion, in which the workpiece 12 moved to the follow-up conveyor 2 becomes. This step is recorded in Fig. 2. Extended during the funding process the conveyor track of the pre-conveyor 1 in the direction of arrow P1 to over Track center of the subsequent conveyor 2 by corresponding movement of the carriage 6. The The belt requirement of the conveyor belt 3 required for this is the belt loop memory 7 removed, the dancer roll 10 in the direction of arrow P2 upwards emotional. In the travel position shown in FIG. 2, the workpiece 12 has a position reached, in which it is located completely above the conveyor track 4 of the subsequent conveyor 2.

Now, in the third step, which is shown in Fig. 3, the conveyor belt 3 of the Pre-conveyor 1 stopped and immediately thereafter via a return movement of the carriage 6 in the direction of arrow P3 the length of its conveyor track again shortened its original length. The workpiece moves through this return movement 12 deposited on the conveyor belt 4 of the follow-up conveyor 2. The piece of tape that is released is in turn transferred to the tape loop memory 7, which is a movement of the Dancer roll 10 in the direction of arrow P4 downward.

As soon as the carriage 6 returns to its original right starting position during the return movement has reached again, the working cycle described has ended. That state is shown in Fig. 4.

To prevent the conveyor belt 3 when the carriage 6 moves backward runs in reverse, the roller 5 and the belt deflection rollers 8 and 9 with reverse locks provided, in FIGS. 1 to 4, but also in FIG. 5 in each case by one denoted by S. Arrow on the roller symbols are indicated.

Since the conveyor belt 3 during the renewed shortening of its conveyor track in the loading area stands still can already be carried out during the third step start placing a new workpiece 12. The one cycle the final third step therefore overlaps in an extraordinarily advantageous manner with the first step of a new cycle. In Figure 3 this is already done by a again indicated on the conveyor belt 3 placed part 121, which is still by the the piece of fabric 122 to be deposited above must be added to the workpiece 12.

When pre-conveyor 1 and follow-up conveyor 2 are arranged with conveying directions perpendicular to each other it is generally useful to keep the conveyor belt 4 of the subsequent conveyor 2 during to stop the transfer of a workpiece 12 from the pre-conveyor 1 to the subsequent conveyor 2. With a sufficiently high reversing speed of the carriage 6, it is also basically possible to provide continuous operation for the subsequent conveyor 2. In other words, only the return speed of the carriage 6 has to be so great be chosen that the movement of the conveyor belt 4 of the follow-up conveyor 2 for the Transfer process of a workpiece 12 can no longer represent a malfunction.

5, which in turn the pre-conveyor 1 with the subsequent conveyor 2 corresponding to FIGS. 1 to 4 shows still further details of the pre-conveyor 1. The stand 11 of the The forward conveyor 1 has a chassis 112 provided with wheels 113 on the foot side that the pre-conveyor 1 can be moved as required. The carriage 6 has one Carriage plate 61, the front of which has a ramp-like profile Sled head is 60. The upper and front lower band edges of the sled head 60 are realized by tubes or rod rollers 61 and 62, which allow easy sliding or Ensure that the conveyor belt 3 rolls over the carriage head 60. At the Carriage plate 61 are fixed on both sides of guide bushes 64, via which the Carriage 6 is guided in guide rods 65. The guide rods 65 are in guide rod holders 66 held on the side walls 111 of the stand 11.

For the displacement of the carriage 6 in the conveying direction, this is shown in FIG to 9 shown cable drive 30 connected.

The perspective view of the pre-conveyor 1 according to FIGS. 5 and 6 in FIG. 7 enables supervision of the slide 6 with its cable drive 30. The cable drive 30 has a lifting cylinder 14 which is attached to the central cross strut 116 of the stand 11 is attached and the lifting rod 15 carries a roller head 31 at the free end. over its roles, not shown in Fig. 7, the roller head 31 is in interrupted Line ropes 34 and 35 shown in engagement. Each on the sled plate 61 attached pull cables 34 and 35 continue to run in unspecified Rolling of roller guides 32 and 33 on the stator side Realization of a pulley function via the four middle rollers of the roller guide 32 on the upper cross strut 114 and the rollers of the roller head 31 assigned to it an upper double loop. In the same way, the pull rope 35 forms for implementation a pulley function via the four middle rollers of the roller guide 33 at the bottom Cross strut 115 and the rollers of the roller head 31 assigned to it a lower one Double loop.

Further details of the cable drive 30 show the schematic representations of FIG. 8 and 9, on the basis of which the operation of the cable drive 30 is also explained in more detail shall be. For reasons of clarity, the carriage 6 itself is shown in these figures not shown. However, it is broken by the two with a larger line Connecting lines 67 and 68 shown in line width are indicated. The endpoints of the Connecting line 67 represent the attachment points BH of the pull cable 34 in the rear The area of the slide plate 61 and the end points of the connecting line 68 are the fastening points BV on the slide plate 61 in the front area. For the better Differentiation are in FIGS. 8 and 9, the pull rope 34 by an extended and Traction rope 35 shown by a broken line.

8, the lifting cylinder 14 moves its lifting rod 15 with the roller head 31 in Direction of arrow P6 down. Here the pull rope 34 is stressed on train and causes the carriage 6 in the sense of an extension of the conveyor track of the conveyor belt 3 in a forward movement according to arrow P1. The dancer roll 10 moves at the same time according to arrow P2 upwards. The tape loop of the tape loop memory 7 is getting smaller.

In Fig. 9, the lifting cylinder 14 moves its lifting rod 15 with the roller head 31 accordingly the arrow P5 upwards. Here the pull rope 35 is stressed on train and causes the carriage 6 in the sense of shortening the conveyor path of the conveyor belt 3rd for a backward movement according to arrow P3. The dancer roll 10 moves at the same time according to the arrow P4 down. The tape loop of the tape loop memory 7 gets bigger.

The respective commissioning of the pre-conveyor 1 for moving a workpiece 12 for Follow-on conveyor 2 determines the operator at the lay-on workplace, who is in the Figures not shown hand or foot switch is available. If one Coordination of the movement sequences between the pre-conveyor 1 and the subsequent conveyor 2 is necessary, this coordination takes place via a control device common to them.

10 shows a preferred arrangement for feeding workpieces to a bonding device 70 by means of two pre-conveyors 101 and 102. Each of the two pre-conveyors 101 and 102 forms a lay-on workplace for one Operator A or B. In Fig. 10 is only the input side of the gluing device 70 with the conveyor belt 71 moving continuously and uniformly in the direction of the arrow shown. The width of the conveyor belt 71 is larger than the total conveyor belt width of the two pre-conveyors 101 and 102. The feeding of the operator A and B workpieces 12 placed on the pre-conveyors 101 and 102 via their conveyor belts 3 to the conveyor belt 71 of the gluing device 70 comes without an intermediate conveyor out. This becomes, as already in connection with the explanation of FIGS. 1 to 4 has been mentioned, in that the deposition of the on the pre-conveyor 101 and 102 moved workpieces 12 with a relative to the conveying speed of the Conveyor belt 71 made sufficiently high return speed of the carriage 6 becomes.

11 shows an exemplary embodiment of an arrangement for feeding workpieces to an adhesive device 70 with the aid of four pre-conveyors 101, 102, 103 and 104 for four operators A, B, C and D who performed the laying-on work shown. In this embodiment, it becomes clear how precisely that Pre-conveyor and follow-up conveyor also perpendicular to each other with regard to their conveying direction can be arranged spatially extremely compact overall arrangements possible are. 11 shows, the conveyor belt 71 of the bonding device 70 four intermediate conveyors 72, 73, 74 on the input side in a parallel arrangement and 75 upstream in the direction of conveyance indicated by arrows. The total conveyor width the parallel arrangement of the intermediate conveyors 72, 73, 74 and 75 is again smaller than the width of the conveyor belt 71 of the bonding device 70. Due to the different Length of intermediate conveyors 72 and 73 with respect to intermediate conveyors 74 and 75 it is possible on the opposite sides of the intermediate conveyor parallel arrangement each closely adjacent to two pre-conveyors 101 and 103 or 102 and 104 to provide. To control the movement sequences, each intermediate conveyor 72, 73, 74 and 75 and the respective pre-conveyor 101, 102, 103 and 104 assigned to it, one in FIG 9 associated control device, not shown. As soon as an operator A or B or C or D on their pre-conveyor 101 or 102 or 103 or 104 Has placed workpiece 12, it causes the start of its pre-conveyor. The workpiece 12 is then moved via intermediate conveyor 72 or 73 or 74 or 75 and on the associated intermediate conveyor stored in its shutdown state. Now promotes the intermediate conveyor places the transferred workpiece on the conveyor belt 71 of the adhesive device 70 and then return to the shutdown state.

In principle, it is of course also possible to use intermediate conveyors 72, 73, 74 and 75 continuously, i.e. regardless of the discontinuous operation of the one assigned to them Pre-conveyor 101, 102, 103 and 104 to operate. Here, when funding Workpieces 12 with small dimensions, for example with reinforcing inserts providing shirt collar cuts, the return speed of the sled 6 one Pre-conveyor 101, 102, 103 and 104 during the transfer of a workpiece 12 to the assigned intermediate conveyor 72, 73, 74 and 75 can be selected only slightly higher as their conveying speed to ensure trouble-free operation.

Claims (14)

1. A process for discontinuous pre-conveying of flat workpieces (12), in particular fabric pieces in superposed relationship which are to be glued together, to a subsequent conveyor (2), in a working cycle comprising three working steps,

   wherein in the course of a working cycle during the first working step when the pre-conveyor (1; 101, 102, 103, 104) is in the stationary condition at least one workpiece is laid on the conveyor path (3) thereof in the receiving region thereof,

   wherein in the second working step the pre-conveyor is set in operation and the workpiece laid thereon is moved to the subsequent conveyor, and

   wherein to complete said working cycle in the third working step the moved workpiece is transferred to the subsequent conveyor and the pre-conveyor is stopped again, characterised in that

   in the second working step the conveyor path (3) of the pre-conveyor (1; 101, 102, 103, 104) is extended in the direction of conveying movement thereof beyond the near edge (4) of the conveyor path of the subsequent conveyor (2) to such an extent that a workpiece (12) laid on the pre-conveyor can be moved in the conveying direction of the pre-conveyor (1; 101, 102, 103, 104) completely to a reference position above the conveyor path of the subsequent conveyor (2),

   the pre-conveyor (1; 101, 102, 103, 104) is stopped as soon as a workpiece (12) which has been moved over the conveyor path of the subsequent conveyor (2) has reached its reference position, and

   transfer of the moved workpiece (12) to the subsequent conveyor (2), which is to be effected in the third working step at the same time as the beginning of the first working step of a following working cycle is effected by again shortening the conveyor path of the pre-conveyor (1; 101, 102, 103, 104) into the near edge region of the conveyor path of the subsequent conveyor (2).
2. A process according to claim 1 characterised in that

   the movement of a workpiece (12) on the pre-conveyor (1; 101, 102, 103, 104) and the extension of its conveyor path, which is to be effected at the same time as same, is effected at the highest possible speed.
3. A process according to claim 1 or claim 2 characterised in that

   the subsequent conveyor (2) is stopped at least during the transfer of a workpiece (12) which is moved on the pre-conveyor (1), which transfer is to be effected in the third working step of a working cycle.
4. A process according to claim 1 or claim 2 characterised in that

   the subsequent conveyor (2) is operated in the continuously switched-on mode and

   that the operation of again shortening the conveyor path of the pre-conveyor (1; 101, 102, 103, 104), which is to be effected in the third working step for transfer of a workpiece (12) moved on the pre-conveyor (1; 101, 102, 103, 104) to the subsequent conveyor (2), is performed at such a high speed that the transfer operation is not adversely affected by the conveyor path movement of the subsequent conveyor (2).
5. An arrangement for discontinuous pre-conveying of flat workpieces (12), in particular fabric pieces in superposed relationship which are to be glued together, to a subsequent conveyor (2), in a working cycle comprising three working steps,

   wherein in the course of a working cycle during the first working step when the pre-conveyor (1; 101, 102, 103, 104) is in the stationary condition at lease one workpiece is laid on the conveyor path (3) thereof in the receiving region thereof,

   wherein in the second working step the pre-conveyor is set in operation and the workpiece laid thereon is moved to the subsequent conveyor, and

   wherein to complete said working cycle in the third working step the moved workpiece is transferred to the subsequent conveyor and the pre-conveyor is stopped again, characterised in that

   the pre-conveyor (1; 101, 102, 103, 104) has an endless conveyor belt (3) which is guided over rollers, with a roller (5) which provides for belt reversal through 180° at the rear end and a carriage (6) which is displaceable in the direction of conveying movement and which provides for belt reversal through 180° at the front end, as well as a belt drive,

   in the travel region in opposite relationship to the direction of conveying movement the conveyor belt (3) is passed over further belt direction-changing rollers (8, 9) to constitute a belt loop storage device (7) which is variable in its size and which permits the carriage movement, and

   there are provided locking means which permit the circulating movement of the conveyor belt (3) only in one direction in all three working steps of a working cycle.
6. An arrangement according to claim 5, characterised in that

   the carriage (6) comprises a carriage plate (61) with a carriage head (60) which delimits the carriage plate (61) at its front side,

   the carriage head (60) has a ramp-like run-off profile configuration, and

   in this case the upper and the front lower belt edge of the carriage head (60) are in the form of a tube or bar roller (61, 62).
7. An arrangement according to claim 5 or claim 6 characterised in that

   the belt loop storage device (7) between the belt direction-changing rollers (8, 9) which are arranged at a predetermined spacing has a dancer roller (10) which forms the conveyor belt (3) over the belt direction-changing rollers (8, 9) downwardly to form a belt loop which is always tensioned.
8. An arrangement according to one of claims 5 to 7 characterised in that

   the locking means are return-motion blocking means (S) which in that respect are provided at the rear roller (5) which provides for belt reversal and the belt direction-changing rollers (8, 9) of the belt loop storage device (7).
9. An arrangement according to one of claims 5 to 8 characterised in that

   the carriage (6) is guided with guide sleeves (64) which are fixed to its carriage plate (61) on both sides in guide rods (65) which are mounted to the side walls (111) of the support stand structure (11).
10. An arrangement according to one of claims 5 to 9 characterised in that

    the carriage drive is a cable drive (30) having a stroke cylinder (14) with a roller head (31) fixed to the free end of its stroke rod (15),

    the rollers of the roller head (31) are in engagement on the one hand with a first tension cable (34) fixed to the rear end of the carriage plate (61) for movement of the carriage (6) in the one direction and on the other hand with a second tension cable (35) which is fixed to the front end of the carriage plate (61) for movement of the carriage (6) in the other direction,

    a roller guide means (32, 33) on the support stand structure, comprising a plurality of rollers, is provided for each of the two tension cables (34, 35), and

    the guidance of the tension cables (34, 35) in the roller guides (32, 33) respectively associated therewith and in the rollers of the roller head (31) is such that upon a stroke movement of the roller head (31) in one direction the carriage ( 6) performs a forward movement and in the opposite direction it performs a rearward movement.
11. An arrangement according to one of claims 5 to 10 characterised in that

    the subsequent conveyor (2) is an intermediate conveyor which is arranged upstream of a glueing apparatus (70) in the direction of conveying movement and which feeds a workpiece (12) which has been transferred from the pre-conveyor (1) to the continuously circulating transport belt (71) of a glueing apparatus (70).
12. An arrangement according to one of claims 5 to 10 characterised in that

    the subsequent conveyor comprises two and more intermediate conveyors (72, 73, 74, 75) which operate independently of each other, disposed in mutually parallel arrangement, which are arranged upstream of a glueing apparatus (70) in the direction of conveying movement,

    a pre-conveyor (101, 102, 103, 104) is associated with each of the intermediate conveyors (72, 73, 74, 75),

    the intermediate conveyors (72, 73, 74, 75) feed a workpiece (12) transferred to them from the respectively associated pre-conveyor (101, 102, 103, 104) to the continuously circulating transport belt (71) of a glueing apparatus (70) which is arranged downstream of them, and

    in that arrangement the overall belt width of the parallel arrangement of the intermediate conveyors (72, 73, 74, 75) is smaller than or equal to the path width of the transport belt (71) of the glueing apparatus (70), said transport belt (71) receiving the workpieces (12) which are delivered by the intermediate conveyors (72, 73, 74, 75).
13. An arrangement according to one of claims 5 to 10 characterised in that

    the subsequent conveyor (2) is the continuously circulating transport belt (71) of a glueing apparatus, and

    arranged upstream of the glueing apparatus (70) in the direction of conveying movement is a pre-conveyor (101, 102) which transfers a workpiece (12) moved thereon to the transport belt (71) of the glueing apparatus (70) on the entry side thereof.
14. An arrangement according to one of claims 5 to 10 characterised in that

    two and more pre-conveyors (101, 102) which operate independently of each other, disposed in mutually parallel arrangement, are disposed upstream of a glueing apparatus (70) in the direction of conveying movement, and

    in that arrangement the overall belt width of the parallel arrangement of the pre-conveyors (101, 102) is smaller than or equal to the belt width of the transport belt (71) of the glueing arrangement (70), which transport belt (71) receives the workpieces (12) supplied by the pre-conveyors (101, 102).

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