Patent Publication Number: US-2020290819-A1

Title: Method for unloading an item for transport from a transport bag

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     Swiss Patent Applications 00328/19, filed 15 Mar. 2019, the priority document corresponding to this invention, to which a foreign priority benefit is claimed under Title 35, United States Code, Section 119, and their entire teachings are incorporated, by reference, into this specification. 
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to the field of conveying technology and concerns a method for unloading an item for transport from a laterally open transport bag and a bag unloading device for carrying out such a method. 
     Discussion of Related Art 
     During the conveying of items for transport by means of suitable transport bags, the unloading of the items for transport from the transport bags is an aspect in the case of which a simple and fast method with the highest possible level of automation is desired. 
     The prior art has disclosed multiple approaches for the unloading of items for transport from transport bags. EP2686258, for example, describes a hanging conveyor system with a transport bag for the automatic unloading of a loaded item of piece goods and with an unloading station, wherein the transport bag has a main body and a separate receptacle which closes against said main body. The unloading of the transport bag takes place through one of the face sides, which is of open form, of the main body, wherein an oppositely situated face side is likewise of open form. The bottom side of the main body couples to the top side of the receptacle, in order to define a receptacle space below the main body, wherein the lateral sides of the receptacle are formed such that the base can be raised into an unloading position of the transport bag, in which the base has been raised into the bottom side of the main body. The transport bag has in each case one retention device which, in the region of the face sides, extends at least along a transition between the main body and the receptacle. The unloading station has a raising device and a pushing device, wherein the raising device is configured to, when the transport bag is situated in an unloading position, raise the base of the receptacle of the transport bag laden with at least one item of piece goods vertically such that the at least one item of piece goods can, by means of the pushing device, be pushed out horizontally through one of the face sides of the main body of the transport bag. 
     SUMMARY OF THE INVENTION 
     It is an object of the invention to provide a method for unloading an item for transport from a laterally open transport bag and a bag unloading device for carrying out such a method, which at least partially improve the prior art relating to the unloading of items for transport from laterally open transport bags. 
     Said object is achieved by means of the features of the independent claims. Advantageous refinements of the invention are specified in the dependent claims and in the present description and the figures. 
     The invention relates to a method for unloading an item for transport from a laterally open transport bag which, hanging on a carriage, conveys the item for transport along a running rail in a conveying direction, the item for transport lying on a support surface of the transport bag and the item for transport being unloaded laterally by virtue of a part of the support surface of the transport bag being raised in the direction of the hanging point of the transport bag on the carriage by means of a raising device. 
     In particular, a part of the support surface of the transport bag is raised such that a remaining part of the support surface is lowered relative to the raised part. By means of the raising of a part of the support surface of the laterally open transport bag, the item for transport can be unloaded from the transport bag in automated fashion without the need for complicated ejection devices such as for example pushing means. The unloading process can advantageously be performed substantially by means of a single linear movement of the raising action, such that a coordination of different movement sequences, such as for example a raising action and an ejection action, which is cumbersome from a control aspect, can be avoided. By means of the linear raising of only a part of the support surface of the transport bag, it is furthermore not necessary, during the unloading process, for the entire transport bag to be moved, it rather advantageously sufficing to move substantially only the support surface or the raised part of the support surface. The efficiency and precision of the unloading process can thus be increased. 
     In conjunction with the present invention, it is clear to a person skilled in the art that “laterally open” transport bags refers to transport bags which have a lateral opening such that a lateral removal of the item for transport is possible, wherein this expression may also encompass transport bags with lateral securing elements or wall elements. The “height” of parts of the transport bag is generally to be understood in relation to the hanging point of the transport bag on the carriage. 
     The transport bags are advantageously conveyed in a hanging conveyor device by means of carriages which are movable on a running rail. 
     In one embodiment, a lateral part of the support surface of the transport bag is raised such that the support surface of the transport bag forms a slope transverse to the conveying direction. 
     As a result of the formation of a slope, the item for transport can slide laterally out of the transport bag under the action of gravitational force, without the need for additional removal processes such as for example ejection or picking-out of the item for transport. 
     In one embodiment, an upper edge region, facing toward the carriage, of the transport bag remains at a constant height during the raising of the part of the support surface of the transport bag. 
     In particular, the part of the support surface of the transport bag may be raised such that an upper edge of the transport bag is not moved, that is to say the position of the edge in relation to the hanging point of the transport bag on the carriage remains unchanged. In certain refinements, the transport bag comprises, in the upper edge region, a movably mounted frame. In these refinements, the part of the support surface of the transport bag may be raised such that the position of the frame remains unchanged during the raising of the part of the support surface. 
     In one refinement, a wall surface, adjoining the support surface, of the transport bag is deformed during the raising of the part of the support surface. 
     Preferably, the transport bag comprises a flexible material web which forms a transport strap such that the wall surfaces, adjoining the support surface, of the transport bags are at least partially deformable. As a result of the raising of a part of the support surface, in particular while maintaining the height of the upper edge region of the transport bag, it is thus possible for a wall surface adjoining the support surface, generally the front and/or rear wall in relation to the conveying direction, to be deformed. 
     In particular, the part of the support surface of the transport bag may be raised such that a first and an oppositely situated second lateral opening of the transport bag move relative to one another. 
     In one refinement, the support surface of the transport bag is, during the raising of the part of the support surface, pivoted about a preferably horizontal axis running through the support surface of the transport bag. 
     Preferably, the axis runs perpendicular to a lateral unloading direction of the transport bag. In one refinement, the axis runs substantially parallel to the conveying direction of the transport bag or of the carriage. 
     Alternatively, the support surface of the transport bag may, during the raising of the part of the support surface, be pivoted about a preferably horizontal axis running through the interior space of the transport bag. 
     In particular, it is advantageously the case that, during the raising process, only the support surface and not the entire transport bag is pivoted, which simplifies the unloading process. 
     In one refinement, the support surface of the transport bag is subjected to a linear displacement superposed on the pivoting movement. 
     The linear displacement may take place in a vertical direction or in some other direction. It is clear to a person skilled in the art that an offsetting of the support surface may be performed in a manner superposed on the raising of the part of the support surface or on the pivoting movement. Even in the case of a superposed linear displacement of the support surface itself, however, a part of the support surface is raised relative to a remaining part of the support surface, such that the support surface can form a slope. 
     In one refinement, the spacing between a first and a second wall surface, adjoining the support surface, of the transport bag is increased during the raising of the part of the support surface. 
     In one refinement, the carriage is stopped for the purposes of unloading the item for transport from the transport bag. In particular, the carriage may be stopped, and the part of the support surface of the transport bag may be raised subsequently. This may be particularly advantageous if, for the raising of the part of the support surface of the transport bag, use is made of an active raising device such as for example a height-adjustable plunger or an engagement means such as for example a hook, a loop etc. 
     In further refinements, the item for transport is unloaded from the transport bag during the conveying movement of the carriage. In particular, the part of the support surface of the transport bag may be raised during the conveying movement of the carriage. This may be particularly advantageous if, for the raising of the part of the support surface of the transport bag, use is made of a passive raising device such as for example a motion guide and an engagement means such as for example a roller, a pin etc. 
     The invention furthermore relates to a bag unloading device for carrying out the method according to the present invention, comprising a raising device which is designed to raise a part of a support surface of a transport bag in the direction of the hanging point of the transport bag on the carriage such that the support surface forms a slope transverse to the conveying direction. 
     By means of the slope, an unloading direction transverse with respect to the conveying direction can be defined, such that the item for transport can be unloaded laterally from the transport bag by sliding down the slope. The raising device is preferably configured to interact with a subregion around that part of the support surface of the transport bag which is to be raised, wherein the raising may be performed by means of a pulling movement of the raising device from above the support surface and/or by means of a pushing movement of the raising device from below the support surface. 
     In one refinement, the raising device is configured to raise the part of the support surface with an impulse sufficient to overcome the static friction of the item for transport lying on the support surface. 
     Preferably, the raising device is designed to interact only with the subregion around that part of the support surface of the transport bag which is to be raised in such a way that an upper edge region, facing toward the carriage, of the transport bag remains at a constant height during the raising of the part of the support surface. 
     Since it is generally sufficient for the raising device to be configured to effect a linear raising movement of the part of the support surface, the bag unloading device can be of simpler design in relation to solutions from the prior art. For example, it is possible to avoid complicated bearing arrangements at the hanging point of the transport bag on the carriage, which would be required for example for a pivoting of the transport bag as a whole. 
     In one refinement, the bag unloading device comprises a sensor which is configured to determine the, in particular vertical, position of the support surface. The raising device can adapt the stroke during the raising movement to the determined position of the support surface. The sensor may alternatively or additionally be configured to determine the dimensions of the transport bag and/or of the item for transport. The raising device can adapt the stroke during the raising movement to the determined dimensions of the transport bag and/or of the item for transport. The sensor may be connected to a controller to which the determined position and/or dimensions are transmitted. The controller is advantageously designed to control the raising device, in particular adapt the stroke and/or the impulse of the raising movement, on the basis of the position and/or dimensions determined by the sensor. 
     In one refinement, the raising device is designed to raise the part of the support surface of the transport bag such that a wall surface, adjoining the support surface, of the transport bag is deformed. 
     In one refinement, the raising device comprises a height-adjustable plunger which is configured to, from below the support surface, displace the part of the support surface of the transport bag in the direction of the hanging point of the transport bag on the carriage. 
     The plunger is preferably arranged offset from a central vertical axis of the transport bag, such that the plunger can raise a lateral subregion of the bag. 
     In one refinement, the bag unloading device comprises two plungers which are arranged opposite one another in a manner offset from the central vertical axis of the transport bag. By means of this arrangement, the support surface of the transport bag can be selectively raised in both lateral directions of the transport bag, such that unloading of the item for transport in both lateral directions or out of both lateral openings of the transport bag is made possible. 
     In one refinement, the plunger has a pushing surface which has a gradient transverse to the conveying direction, the pushing surface being designed to slope downward in an unloading direction. 
     By means of the pushing surface, the plunger can assist the formation of a slope. In particular in the case of a flexible support surface of the transport bag, the pushing surface of the plunger can stabilize the slope. 
     In one refinement, the plunger has a pushing surface which is pivotable about a horizontal axis. By means of the pivoting of the pushing surface, the unloading direction can be changed from one side of the transport bag to the opposite side of the transport bag. 
     In one refinement, the raising device has a positionally fixedly arranged motion guide which is designed to, from below the support surface, raise the part of the support surface of the transport bag. The motion guide is preferably arranged offset from a central vertical axis of the transport bag, such that a lateral part of the support surface of the transport bag can travel over the motion guide and be raised by the motion guide. 
     Preferably, the transport bag has, in the region of the support surface, a reinforcement which assists the formation of a slope as the support surface travels over the motion guide. The reinforcement may comprise struts, strips, rods or the like. 
     In one refinement, the raising device comprises a first engagement means which is designed to engage into a second engagement means of the transport bag and raise the part of the support surface of the transport bag in the direction of the hanging point of the transport bag on the carriage. 
     The first and/or the second engagement means may comprise inter alia at least one out of hook, comb, loop, edge, motion guide, roller, pin. 
     For example, the first engagement means may comprise a hook and the second engagement means may comprise a loop arranged laterally on the transport bag, such that the hook can engage into the loop and raise a lateral part of the support surface of the transport bag by means of a pulling movement, wherein the raising device is in this case arranged above the support surface of the transport bag. 
     In one refinement, the second engagement means comprises multiple loops which are arranged laterally on the transport bag and into which a hook or a comb of the first engagement means can engage. This has the advantage that the reliability of the engagement of the first and of the second engagement means into one another can be increased. 
     Alternatively and correspondingly, the first engagement means may comprise a loop, and the second engagement means may comprise a hook. 
     A hook of the first engagement means may also engage into an edge of the second engagement means of the transport bag. Alternatively and correspondingly, an edge of the first engagement means may engage into a hook of the second engagement means of the transport bag. It is also conceivable for the first engagement means and the second engagement means to each comprise edges which are designed such that they can engage into one another. 
     In a further example, the first engagement means may comprise a fixedly arranged motion guide over which a roller arranged laterally on the transport bag or a pin of the transport bag arranged laterally on the transport bag can be guided such that a lateral part of the support surface of the transport bag is raised. In this case, the item for transport can advantageously be unloaded without stopping the transport bag. 
     In a further refinement, the raising device comprises a roller which is designed to, by rotation, raise a part of the support surface such that the support surface forms a slope transverse to the conveying direction. 
     Preferably, the roller has an axis of rotation which is oriented horizontally and perpendicularly to a lateral unloading direction. The roller is preferably arranged offset from a central vertical axis of the transport bag. 
     In one refinement, the roller is designed as a brush roller, the brush roller having a brush trim which is configured to raise a part of the support surface of the transport bag in the direction of the hanging point of the transport bag on the carriage. 
     In one refinement, the roller is designed as a brush roller, the brush roller having a brush trim which, in a resting configuration, lies against the brush roller and, during rotation, is set radially upright and thus increases the effective diameter of the brush roller. Owing to the radial setting-upright of the brush trim, the brush roller can, by rotation, effect a linear raising of a part of the support surface of the transport bag. The brush trim may extend over the entire circumference or over a part of the circumference of the brush roller. 
     In a further refinement, the roller is designed as a brush roller with a brush trim, wherein the brush trim extends over a part of the circumference of the brush roller and has a trim length which varies over the part of the circumference, preferably increases counter to a direction of rotation. 
     In one refinement, the roller has a projection which is configured to, in the case of rotation of the roller, raise a part of the support surface of the transport bag. 
     The projection of the roller may be designed as a cam. The cam may comprise bearing rollers which make it easier for the cam to roll on the support surface that is to be pushed against. The cam may be designed as a curved limb. 
     The invention furthermore relates to a conveying device comprising a bag unloading device according to the present invention, a running rail and a multiplicity of laterally open transport bags which, in each case hanging on a carriage which is movable along the running rail, can be conveyed in a conveying direction. 
     In one refinement, the conveying device comprises a controller which is configured to control the raising device of the bag unloading device such that the raising device raises a part of a support surface of a transport bag for the purposes of unloading an item for transport from the transport bag. The controller may, as described above, be connected to a sensor of the bag unloading device, which sensor is configured to determine, and transmit to the controller, the position of the support surface of a transport bag and/or the dimensions of a transport bag and/or of an item for transport in the transport bag. 
     Preferably, the carriages can be conveyed with variable spacing to one another on the running rail. In certain refinements, the carriages can be conveyed on the running rail by means of a conveying chain. 
     In one refinement, the support surface of the transport bag is inclined in the conveying direction or counter to the conveying direction. The spacing of the front and rear walls, in relation to the conveying direction, of the transport bag to one another may be increased prior to the raising of the part of the support surface. The support surface may in this case be pivoted about an axis oriented transversely with respect to the conveying direction, such that the inclination of the support surface is varied. 
     In one refinement, the transport bag has lateral wall elements which, during transport, prevent the item for transport from sliding out laterally. 
     As a result of the pivoting of the support surface about the axis oriented transversely with respect to the conveying direction, the item for transport can be displaced relative to the lateral wall elements, such that unloading by sliding out laterally is made possible. 
     The transport bags may have, in the upper edge region, a pivot frame which is pivotable such that the spacing between the front and rear walls of the transport bag is variable. 
     The pivot frame may be pivoted counted to the conveying direction or in the conveying direction for example by means of suitable motion guides. 
     In one refinement, the transport bags each comprise a flexible material web which, in each case forming a transport strap, hangs on a hanging point on the carriage, the transport bag having, in the region of the support surface, a reinforcement. Preferably, the reinforcement is configured to interact with the raising device for the raising of a part of the support surface of the transport bag. 
     The flexible material web does not need to hang directly, but rather may hang via a suitable suspension device, on the carriage. For example, the flexible material web may hang on the carriage via a pivot frame and a suspension for the pivot frame. 
     The reinforcement is advantageously designed such that, during the raising of the part of the support surface, the formation of a slope is assisted or permitted. Preferably, the reinforcement is oriented transversely with respect to the conveying direction or along an unloading direction. 
     The reinforcement may comprise struts, strips, rods or the like. Preferably, the struts, strips, rods or the like are incorporated into the transport bag or into the flexible material web. 
     In certain refinements, the transport bag comprises a flexible material web without reinforcement of the transport bag in the region of the support surface. For example, this may be the case in a refinement of the raising device comprising a plunger with an inclined pushing surface, because the pushing surface of the plunger provides the slope. 
     In one refinement, the transport bags have, in the region of at least one wall surface, adjoining the support surface, of the transport bag, a reinforcement structure which is configured to provide predetermined fold points at which the transport bag is deformable during the raising of the part of the support surface of the transport bag. 
     The predetermined fold points may advantageously serve for configuring the deformability of the wall surfaces of the transport bags such that the spacing between the front and rear walls of the transport bag is increased during the raising of the part of the support surface of the transport bag. In this way, a lateral opening of the transport bag can be suitably enlarged in the unloading direction such that the unloading of the item for transport is simplified. 
    
    
     
       BRIEF DESCRIPTION OF SEVERAL VIEWS OF THE DRAWINGS 
       Aspects of the invention will be discussed in more detail on the basis of the exemplary embodiments shown in the following figures and the associated description. In the figures: 
         FIG. 1  shows a perspective view of an embodiment of a bag unloading device in a configuration prior to raising of a part of a support surface of a transport bag; 
         FIG. 2  shows the bag unloading device from  FIG. 1  during the raising of the part of the support surface; 
         FIG. 3 a    shows an embodiment of a transport bag with a pivot frame in a frontal view; 
         FIG. 3 b    shows a side view of two configurations of the transport bag from  FIG. 3   a;    
         FIG. 4 a    shows a frontal view of an embodiment of a bag unloading device with a raising device comprising a brush roller, with the brush roller in a resting configuration; 
         FIG. 4 b    shows the bag unloading device from  FIG. 4 a    with the brush roller during a rotational movement; 
         FIG. 5 a    shows a frontal view of an embodiment of a bag unloading device comprising a motion guide in a configuration prior to the raising of a part of the support surface; 
         FIG. 5 b    shows the bag unloading device from  FIG. 5 a    during the raising of the part of the support surface; 
         FIG. 5 c    shows the motion guide from  FIG. 5 a    and  FIG. 5 b    in a side view; 
         FIG. 6 a    shows a frontal view of one embodiment of a transport bag with reinforcement structures of the wall surfaces; 
         FIG. 6 b    shows a frontal view of one embodiment of a transport bag with reinforcement structures of the wall surfaces; 
         FIG. 6 c    shows a frontal view of one embodiment of a transport bag with reinforcement structures of the wall surfaces; 
         FIG. 7 a    shows a frontal view of an embodiment of a bag unloading device with a raising device comprising a roller with a cam in two different configurations; 
         FIG. 7 b    shows a frontal view of an embodiment of a bag unloading device with a raising device comprising a roller with a cam in two different configurations; 
         FIG. 8 a    shows a frontal view of an embodiment of a bag unloading device with a raising device comprising a brush roller in a first configuration; 
         FIG. 8 b    shows a frontal view of an embodiment of a bag unloading device with a raising device comprising a brush roller in a second configuration; 
         FIG. 9 a    shows a frontal view of an embodiment of a bag unloading device with a raising device comprising a roller, with a cam designed as a curved limb, in a first configuration; 
         FIG. 9 b    shows a frontal view of an embodiment of a bag unloading device with a raising device comprising a roller, with a cam designed as a curved limb, in a second configuration; 
         FIG. 10 a    shows a frontal view of an embodiment of a bag unloading device with a raising device comprising two oppositely arranged plungers; 
         FIG. 10 b    shows a frontal view of an embodiment of a bag unloading device with a raising device comprising two oppositely arranged plungers; 
         FIG. 10 c    shows a frontal view of an embodiment of a bag unloading device with a raising device comprising two oppositely arranged plungers; 
         FIG. 11 a    shows a frontal view of an embodiment of a bag unloading device with a raising device comprising one plunger with a pushing surface; and 
         FIG. 11 b    shows a frontal view of an embodiment of a bag unloading device with a raising device comprising one plunger with a pushing surface. 
     
    
    
     DESCRIPTION OF PREFERRED EMBODIMENTS 
       FIG. 1  shows a perspective view of an embodiment of a bag unloading device  1  in a configuration prior to the raising of a part  211  of a support surface  21  of a laterally open transport bag  2 . The transport bag  2  is attached in a hanging manner to a carriage  3  which is arranged such that it can be conveyed on a running rail  4  of a conveying device  10 . In the upper edge region  22 , the transport bag  2  has a pivot frame  23  which can be pivoted for example by means of a motion guide. 
     The transport bag  2  comprises a flexible material web  24  which, forming a transport strap, is attached at its ends to the pivot frame  23 . Situated in the transport bag  2  is an item for transport T, which lies on the curved support surface  21 . The support surface  21  is adjoined by a front wall surface  241  and a rear wall surface  242 , which form a front wall and rear wall of the transport bag  2 . The material web  24  formed as a transport strap forms two lateral openings  243  and  244  of the transport bag  2 , from which the item for transport T can be unloaded. 
     As a result of the pivoting of the pivot frame  23 , the spacing between the front wall surface  241  and the rear wall surface  242  can be varied. 
       FIG. 1  shows the pivot frame  23  in a horizontal configuration, in which the spacing between the front wall surface  241  and the rear wall surface  242  is at a maximum and therefore an unloading of the item for transport T from the lateral openings  243  and  244  is promoted. 
     Arranged below the support surface  21  is a height-adjustable plunger  11  of a raising device. The height-adjustability of the plunger  11  is indicated by the double arrow. The plunger  11  is arranged offset from a central vertical axis of the transport bag  2 , such that, when it pushes against the support surface  21 , a lateral part  211  of the support surface  21  is raised, as can be seen in  FIG. 2 . 
       FIG. 2  shows the bag unloading device  1  from  FIG. 1  during the raising of the lateral part  211  of the support surface  21  of the transport bag  2 . The carriage  3  has been stopped for the purposes of unloading the item for transport T from the transport bag  2 . In relation to the configuration in  FIG. 1 , the plunger  11  has been deployed upward, such that the plunger  11  raises the part  211  of the support surface  21 . As a result of the raising of the part  211 , the support surface  21  forms a slope in a lateral unloading direction E, such that the item for transport T slides out of the opening  243 . 
     It can also be seen that, as a result of the raising of the part  211  by the plunger  11 , both the front wall surface  241  and the rear wall surface  242  are deformed, and the opening  244  moves relative to the opening  243 . During the raising of the part  211  of the support surface  21 , the upper edge region  22  and the pivot frame  23  remain at a constant height. In particular, the position of the edge region  22  in relation to the hanging point P of the transport bag  2  on the carriage  3  remains unchanged. 
       FIG. 3 a    shows an embodiment of a laterally open transport bag  2   a  with a pivot frame  23   a  in a frontal view. The transport bag  2   a  has, in the region of the support surface  21   a , a reinforcement  25   a  which comprises struts  251   a  oriented transversely with respect to the conveying direction. A corresponding reinforcement of the transport bag in the region of the support surface is also conceivable for the transport bags shown in the other figures. In particular for the transport bags  2  and  2   b - c ,  2   g - j  in  FIGS. 1, 2, 4, 5 and 7-10 , such a reinforcement is particularly advantageous in order to assist the formation of a slope of the support surface. 
       FIG. 3 b    shows a side view of two configurations of the laterally open transport bag  2   a  from  FIG. 3 a   . The configuration of the transport bag  2   a  shown by solid lines corresponds to the configuration shown in  FIG. 3 a   , in which the pivot frame  23   a  hangs substantially vertically downward from the carriage  3  and the front wall surface  241   a  and the rear wall surface  242   a  have a small spacing to one another. The transport bag  2   a  has lateral wall elements  26   a  which prevent an item for transport conveyed in the transport bag  2   a  from being able to fall laterally out of the transport bag  2   a . The support surface  21   a  of the transport bag  2   a  can, by pivoting of the pivot frame  23   a , be pivoted about an axis A 1  which is oriented transversely with respect to the conveying direction and which projects into the plane of the drawing, as shown by way of the configuration illustrated by the dash-dotted lines. 
     As a result of the pivoting of the support surface  21   a  about the axis A 1 , which is oriented transversely with respect to the conveying direction, the item for transport is displaced relative to the lateral wall elements  26   a  in the direction of the arrow P 1 , such that unloading out of a lateral opening  243   a  is made possible. It can furthermore be seen that the lateral opening  243   a  is increased in size as a result of pivoting of the pivot frame  23   a.    
       FIG. 4 a    shows a frontal view of an embodiment of a bag unloading device  1   b  having a raising device comprising a brush roller  11   b , with the brush roller  11   b  in a resting configuration. The brush roller  11   b  has an axis of rotation A 2  which is oriented horizontally and perpendicular to a lateral unloading direction and which is arranged offset from a central vertical axis A 3  of the transport bag  2   b . The brush roller has a brush trim  111   b , which is lying against the brush roller  11   b.    
       FIG. 4 b    shows the bag unloading device  1   b  from  FIG. 4 a    with the brush roller  11   b  during a rotational movement about the axis of rotation A 2 . In relation to the resting configuration in  FIG. 4 a   , the brush trim  111   b  has been set radially upright, such that the effective diameter of the brush roller  11   b  transversely with respect to the axis of rotation A 2  has thus been increased. Owing to the radial setting-upright of the brush trim  111   b , a lateral part  211   b  of the support surface  21   b  of the transport bag  2   b  has been linearly raised. The brush trim  111   b  extends over the entire circumference of the brush roller  11   b.    
     As a result of the linear raising of the lateral part  211   b , the support surface  21   b  forms a slope in an unloading direction, such that the item for transport T can be unloaded laterally from the transport bag  2   b . It can be seen in  FIG. 4 b    that the item for transport T is sliding from the transport bag  2   b  onto a ramp  5  arranged at the bag unloading device  1   b.    
     Both in  FIG. 4 a    and in  FIG. 4 b   , the pivot frame  23   b  is situated on a motion guide  6  by means of which the pivot frame  23   b  is pivoted into a horizontal position and held in said position, such that the spacing between the front and rear wall surfaces of the transport bag  2   b  is enlarged and the item for transport T can be easily unloaded from a lateral opening of the transport bag  2   b.    
     Stopping of the rotation of the brush roller  11   b  causes the brush trim  111   b  to lie against the brush roller  11   b  again, such that the part  211   b  of the support surface  21   b  can, as required, for example after the unloading of the item for transport T, be lowered again (correspondingly to  FIG. 4 a   ). 
     It can be seen in  FIGS. 4 a  and 4 b    that, during the raising of the part  211   b , the support surface  21   b  is pivoted about an axis S running through the support surface  21   b.    
     The curvature of the transport bag  2   b  in the lower region of the transport bag  2   b  corresponding to the curvature of the transport bag  1  shown in  FIG. 1  is indicated by means of horizontal lines in the lower region of the transport bag  2   b . Corresponding lines are shown for the transport bags in  FIGS. 5 a - b , 6 a - c , 7 a - b , 8 a - b , 9 a - b , 10 a   - c  and  11   a - b.    
       FIG. 5 a    shows a frontal view of an embodiment of a bag unloading device  1   c  comprising a raising device designed as a motion guide  11   c  in a configuration prior to raising of a part  211   c  of the support surface  21   c  of the transport bag  2   c . The conveying direction of the transport bag  2   c  points out of the plane of the drawing. The motion guide  11   c  is arranged offset from the central vertical axis of the transport bag  2   c.    
       FIG. 5 b    shows the bag unloading device  1   c  from  FIG. 5 a    during the raising of the part  211   c  of the support surface  21   c  by the motion guide  11   c . In relation to  FIG. 5 a   , the transport bag  2   c  has moved slightly further in the conveying direction and has thus travelled onto an elevated region of the motion guide  11   c , such that the motion guide  11   c , from below the support surface  21   c , raises the lateral part  211   c  of the support surface  21   c  in the direction of the hanging point of the transport bag  2   c  on the carriage. As a result of the raising of the part  211   c  of the support surface  21   c , a slope is formed transversely with respect to the conveying direction, such that the item for transport T slides laterally out of the transport bag  2   c  onto a ramp  5 . 
       FIG. 5 c    shows the motion guide  11   c  from  FIG. 5 a    and  FIG. 5 b    in a side view. 
       FIG. 6 a    shows a frontal view of an embodiment of a transport bag  2   d  with a reinforcement structure  2411   d  of the front wall surface  241   d . The rear wall surface, which is not visible in  FIG. 6 a   , may likewise have a corresponding reinforcement structure. The reinforcement structure  2411   d  comprises for example a hollow chamber plate composed of plastic. By means of the reinforcement structure  2411   d , predetermined fold points are provided along the edges  24111   d  and  24112   d , at which predetermined fold points the transport bag  2   d  is preferentially deformed during the raising of a part of the support surface  21   d . As a result of the deformation of the transport bag  2   d  along the predetermined fold points  24111   d  and  24112   d , a lateral opening of the transport bag  2   d  is increased in size in a manner which is expedient for the lateral unloading of an item for transport. 
       FIG. 6 b    shows a frontal view of a further embodiment of a transport bag  2   e  with a reinforcement structure  2411   e  of the front wall surface  241   e  comprising two sub-plates  24113   e  and  24114   e , which provide a diagonally oriented predetermined fold point  24115   e  of the transport bag  2   e . The rear wall surface of the transport bag  2   e  may likewise have a corresponding reinforcement structure. 
       FIG. 6 c    shows a frontal view of a further embodiment of a transport bag  2   f  with a reinforcement structure  2411   f  of the front wall surface  241   f , which comprises multiple similar sub-plates  24114   f . By means of the sub-plates  24114   f , multiple horizontal predetermined fold points  24115   f  of the transport bag  2   f  are provided. The sub-plates  24114   f  may, in particular embodiments, be designed as strips, struts, rods or the like. 
       FIGS. 7 a - b    show frontal views of an embodiment of a bag unloading device  1   g  having a raising device comprising a roller  11   g  with a cam  111   g  in two different rotational configurations. The roller  11   g  is rotatable about a horizontal axis A 4 . The cam  111   g  is designed as a curved limb. Rotation of the roller  11   g  and corresponding pushing against the support surface  21   g  by the cam  111   g  cause the part  211   g  to be raised in the direction of the hanging point of the transport bag  2   g  on the carriage, such that the support surface  21   g  forms a slope in an unloading direction. The item for transport T slides out of the transport bag  2   g  along the slope onto a ramp  5 . 
       FIGS. 8 a - b    show frontal views of an embodiment of a bag unloading device  1   h  having a raising device comprising a brush roller  11   h  in two different rotational configurations. The brush roller  11   h  has a brush trim  111   h  which extends over a part of the circumference of the brush roller  11   h.    
     The brush trim  111   h  has a radial trim length which varies over the part of the circumference of the brush roller  11   h  and which increases counter to the direction of rotation. The brush roller  11   h  is arranged laterally offset from a central vertical axis of the transport bag  2   h . As a result of the varying trim length and the arrangement of the brush roller  11   h , a lateral part  211   h  of the support surface  21   h  can be raised when the brush roller  11   h  rotates, as shown in  FIG. 8   b.    
     As a result of the raising of the part  211   h , the support surface  21   h  of the transport bag  2   h  forms a slope, such that the item for transport T can slide laterally out of the transport bag  2   h . If the brush roller  11   h  is rotated onward from the configuration in  FIG. 8 b   , the part  211   h  of the support surface  21   h  is lowered again, because a part of the circumference of the brush roller  11   h  without brush trim  111   h  comes into position below the support surface  21   h.    
     It is also conceivable for the radial trim length of the brush trim to decrease again counter to the direction of rotation at a particular point, such that the part  211   h  of the support surface  21   h  can be correspondingly lowered again after being raised. In such a case, it would also be possible for the brush trim to extend over the entire circumference of the roller. 
       FIGS. 9 a - b    show frontal views of an embodiment of a bag unloading device  1   i  having a raising device comprising a roller  11   i  with a cam designed as a curved limb  111   i  in two different rotational configurations. Similarly to the embodiment shown in  FIG. 7 , the radial spacing of the curved limb  111   i  from the axis of rotation A 5  of the roller  11   i  varies along the direction of rotation. In  FIG. 9 a   , it can for example be seen that the radial spacing of the curved limb  111   i  from the axis of rotation A 5  increases counter to the direction of rotation. Rotation of the roller  11   i  causes the roller  11   i  to linearly raise a part  211   i  of the support surface  21   i  of the transport bag  2   i , such that an item for transport T can be removed laterally from the transport bag  2   i . The curved limb  111   i  has bearing rollers  1111   i  which make it easier for the limb  111   i  to roll on the support surface  21   i.    
       FIGS. 10 a - c    show frontal views of an embodiment of a bag unloading device  1   j  having a raising device comprising two oppositely arranged plungers  11 . 1   j  and  11 . 2   j . In  FIG. 10 a   , the two plungers  11 . 1   j  and  11 . 2   j  have not been deployed, such that the support surface  21   j  of the transport bag  2   j  with the item for transport T lies horizontally. In  FIG. 10 b   , the right-hand plunger  11 . 2   j  has been deployed, such that the right-hand lateral part  211 . 2   j  of the support surface  21   j  is raised and the item for transport T slides out of the transport bag  2   j  in a left-hand unloading direction. By contrast, in  FIG. 10 c   , only the left-hand plunger  11 . 1   j  has been deployed, such that the left-hand lateral part  211 . 1   j  of the support surface  21   j  is raised and the item for transport T slides out of the transport bag  2   j  in a right-hand unloading direction. The item for transport T can thus be unloaded selectively in both lateral directions or from both lateral openings of the transport bag  2   j . The axes S which run through the support surface  21   j  and about which the support surface  21   j  is pivoted are shown in  FIGS. 10 b    and  10   c.    
       FIGS. 11 a - b    show frontal views of an embodiment of a bag unloading device  1   k  with a raising device comprising a plunger  11   k  with a pushing surface  111   k . The pushing surface  111   k  has a gradient transverse to the conveying direction, wherein the pushing surface  111   k  is designed to slope downward in an unloading direction. The conveying direction points out of the plane of the drawing. 
     In  FIG. 11 a   , the plunger  11   k  has not been deployed, such that the support surface  21   k  of the transport bag  2   k  with the item for transport T lies horizontally. The plunger  11   k  has a longitudinal axis A 6 , which is arranged offset, transversely with respect to the conveying direction, from a vertical central axis A 7  of the transport bag  2   k.    
     In  FIG. 11 b   , the plunger  11   k  has been deployed, as indicated by the vertical arrow. As a result of the deployment, the pushing surface  111   k  of the plunger  11   k  pushes against the support surface  21   k  from below, such that a part  211   k  of the support surface  21   k  is raised such that the support surface  21   k  forms a slope in an unloading direction. The item for transport T can slide laterally out of the transport bag  2   k  on the slope of the support surface  21   k.    
     Since the slope of the support surface  21   k  is stabilized by the pushing surface  11   k , no reinforcement of the transport bag  2   k  in the region of the support surface  21   k  is required in this embodiment. The gradient of the slope of the support surface  21   k  corresponds to the gradient of the pushing surface  111   k . In certain embodiments, the transport bag  2   k  may nevertheless have a reinforcement in the region of the support surface  21   k.    
     In  FIGS. 11 a - b   , the pushing surface  111   k  is designed to slope downward to the left, in order that the item for transport T can be unloaded to the left. It is clear that the pushing surface may correspondingly also be designed to slope downward to the right. In certain embodiments, the pushing surface may be designed to be pivotable, such that the unloading direction can be selectively changed. 
     By means of the pushing surface  111   k  of the plunger  11   k , it is furthermore possible, as required, for the support surface  21   k  of the transport bag  2   k  to be subjected to a linear displacement superposed on the pivoting movement. This may be advantageous for example if the ramp  5  is situated at a level in the case of which the slope of the support surface  21   k  formed as a result of the raising of the part  211   k  of the support surface  21   k  would end below the ramp  5 .