Abstract:
A method for locating and conveying a veneer sheet includes: causing a downstream end of a veneer sheet conveyed by a travelling conveying member to abut against a blocking member to correct the attitude of the veneer sheet in such a state that a downstream end of the veneer sheet is perpendicular to the conveying direction of the veneer sheet; and after moving the conveying member in a direction perpendicular to the conveying direction until one side end of the veneer sheet perpendicular to the conveying direction reaches a predetermined position and stopping the conveying member, moving the blocking member to a position where the blocking member does not abut against the veneer sheet. Accordingly, attitude correction of a veneer sheet and locating thereof in the direction perpendicular to the conveying direction can be performed effectively.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a method and apparatus for locating and conveying a sheet-like body where, when a sheet-like body such as a veneer sheet (hereinafter, referred to as a veneer sheet) or the like is conveyed to a downstream or next step, the attitude of the sheet-like body is corrected to a state where a downstream or leading end portion of the sheet-like body in a conveying direction thereof is generally perpendicular to the conveying direction, and one end portion of the sheet-like body in a direction perpendicular to the conveying direction thereof is aligned at a predetermined position and located. 
     2. Description of the Related Art 
     Conventionally, an apparatus which, when a veneer sheet is conveyed to the next step, positions a downward side ed or leading end of the veneer sheet in a conveying direction thereof in a state where it is generally perpendicular to the conveying direction and aligns one side end portion of the veneer sheet at a predetermined position, thereby locating the veneer sheet has been proposed in, for example, Japanese Patent Publication 01-14138. 
     As shown with a schematic plan view in FIG. 19, this apparatus is provided on a conveying-out side, or on a right side in the drawing, of a known adhesive applying machine  1  with a pair of upper and lower rolls for applying adhesive to a surface and a back surface of a veneer sheet  2  with conveyors  3  comprising a plurality of disc-like rolls which have axial center lines in a direction perpendicular to a conveying direction for conveying a veneer sheet in left and right directions and which are driven in forward and reverse directions, a stopper  4  which is movable between a position where it abuts against the veneer sheet conveyed by the conveyors  3  to block movement thereof and a position where it does not abut against the veneer sheet positioned below, a detector  5  which detects that the upstream side end of the veneer sheet  2  in the conveying direction has passed a position of the stopper  4 , a stinging and holding member  9  which has many needle-like members to sting the veneer sheet  2  from a surface side thereof and which are continuously arranged in a direction perpendicular to the conveying direction of the veneer sheet  2 , the stinging and holding member  9  being movable in upward and downward directions and left and right directions shown with arrows in FIG.  19  and being capable of being ascended and descended between a position where the needle-like members sting a veneer sheet and a position where the stinging and holding member  9  does not abut against a veneer sheet, and a detector  30  which detects one side end portion of a veneer sheet in a direction perpendicular to the conveying direction of the veneer sheet. 
     In the apparatus, the pair of rolls of the adhesive applying machine  1  and the conveyors  3  are respectively driven so as to convey a veneer sheet  2  in the right direction, the stopper  4  is caused to stand by at the position where it does not abut against a veneer sheet and the stinging and holding member  9  is further caused to stand by at an illustrated position where it does not abut against a veneer sheet. In this state, the veneer sheet  2  positioned on the left side of the adhesive applying machine  1  is fed into the adhesive applying machine  1  such that a conveying direction of the veneer sheet  2  corresponds to a grain or fiber direction of the veneer sheet. The veneer sheet  2  is applied with an adhesive on its both sides and it is fed out to the conveyors  3  and is thereafter conveyed by the conveyors  3 . When it is detected by the detector  5  that the upstream side end or a trailing end of the veneer sheet  2  has passed the position of the stopper  4 , the conveyors  3  are stopped and the stopper  4  is ascended up to a position where it abuts against the veneer sheet. Next, when the conveyors  3  are reversely rotated to convey the veneer sheet in the reverse direction, the entire upstream side end or trailing end of the veneer sheet  2  is caused to abut against the stopper  4  such that the attitude of the veneer sheet  2  is corrected. Next, after the stinging and holding member  9  is descended to sting and hold the veneer sheet  2 , the stinging and holding member  9  is ascended, and it is moved in the right direction on FIG.  19  and is also moved upward. When the detector  30  detects the one side end portion of the veneer sheet  2  by the movements, the upward movement of the stinging and holding member  9  is stopped and the member  9  is moved only in the right direction. When the veneer sheet  2  reaches a predetermined position, the veneer sheet  2  is separated from the stinging and holding member  9  by a separating member (not shown). The veneer sheets  2  thus conveyed are stacked one on another in a state that the ends of the sheets  2  are generally aligned in an imaginary line L. 
     In the conventional apparatus, however, since such a constitution has been employed that the veneer sheet which is being conveying is re-held by the stinging and holding member  9  and located, it takes an extra time for re-holding the veneer sheet, which is made it difficult to increase efficiency or productivity or efficiency. 
     SUMMARY OF THE INVENTION 
     In order to solve the above-described problem, according to one aspect of the present invention, there is provided a method for locating and conveying a sheet-like body, comprising the steps of causing a downstream side end portion of a sheet-like body conveyed by a travelling conveying member to abut against a blocking member to correct the attitude of the sheet-like body in such a state that the downstream side end of the sheet-like body is perpendicular to the conveying direction of the sheet-like body; moving the conveying member in a direction perpendicular to the conveying direction until one side end of the sheet-like body in the direction perpendicular to the conveying direction reaches a predetermined position and stopping movement of the conveying member in the direction perpendicular to the conveying direction; and moving the blocking member to a position where the blocking member does not abut against the sheet-like body. 
     According to another aspect of the invention, there is provided an apparatus for locating and conveying a sheet-like body, comprising: a conveying member which conveys a sheet-like body in a conveying direction by travelling thereof and which can reciprocate in an X direction perpendicular to the conveying direction; a moving mechanism which reciprocates the conveying member in the X direction; a blocking member which can reciprocate between a position where the blocking member abuts against the sheet-like body conveyed in the conveying direction by the conveying member to block conveyance of the sheet-like body and a position where the blocking member allows passing of the sheet-like body; a first detector which detects whether or not the downstream side end of the sheet-like body is positioned to abut against the blocking member which stands by at a position where the blocking member prevents the conveyance; a second detector which detects that one side end of the sheet-like body in the direction perpendicular to the conveying direction of the sheet-like body has reached the predetermined position by movement of the conveying member in the X direction effected by actuation of the moving mechanism; a controller which performs such control that both of moving the blocking member at the position where the blocking member allows passing of the sheet-like body and actuating the moving mechanism to move the conveying member in the X direction are simultaneously performed or either one thereof is first performed on the basis of a signal form the first detector which has detected the downward side end of the sheet-like body conveyed by the conveying member in the state where the blocking member stands by at the position where the blocking member prevents the conveyance, and the moving mechanism is then stopped on the basis of a signal from the second detector which has detected the sheet-like body. 
     Since the present invention has been constituted in the above manner, correction of the attitude of a sheet-like body and locating thereof in the direction perpendicular to the conveying direction of the sheet-like body can be performed effectively. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a plan view of an apparatus of an embodiment according to the present invention; 
     FIG. 2 shows a portion of the apparatus of FIG. 1 as view in an A—A direction of FIG. 1; 
     FIG. 3 shows a portion of the apparatus of FIG. 1 as view in a B—B direction of FIG. 1; 
     FIG. 4 is a view for explaining an operation of the apparatus of the embodiment; 
     FIG. 5 is a view for explaining an operation of the apparatus of the embodiment; 
     FIG. 6 is a view for explaining an operation of the apparatus of the embodiment; 
     FIG. 7 is a view for explaining an operation of the apparatus of the embodiment; 
     FIG. 8 is a view for explaining an operation of the apparatus of the embodiment; 
     FIG. 9 is a view for explaining an operation of the apparatus of the embodiment; 
     FIG. 10 is a view for explaining an apparatus of a partially modified embodiment; 
     FIG. 11 is a plan view of the apparatus of the partially modified embodiment; 
     FIG. 12 shows a portion of the apparatus of FIG. 11 as viewed in a D—D direction of FIG.  11 . 
     FIG. 13 shows a portion of the apparatus of FIG. 11 as viewed in an E—E direction of FIG. 11; 
     FIG. 14 is a view for explaining an operation of the apparatus of the partially modified embodiment; 
     FIG. 15 is a view for explaining an operation of the apparatus of the partially modified embodiment; 
     FIG. 16 is a view for explaining an apparatus of a partially modified embodiment; 
     FIG. 17 is a view for explaining the apparatus of a partially modified embodiment; 
     FIG. 18 is a portion of the apparatus of FIG. 17 as viewed in an F—F direction of FIG. 17; and 
     FIG. 19 is a plan view for explaining a prior art. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     An embodiment of the present invention will be explained with reference to FIGS. 1 to  3 . 
     FIG. 1 is a plan view of an apparatus of the embodiment, FIG. 2 shows a portion of the apparatus of FIG. 1 as viewed in an A—A direction of FIG. 1, and FIG. 3 is a partial sectional and partial omitted view as viewed in a B—B direction of FIG.  1 . 
     Reference numerals  31 ,  33  shown in FIG. 1 denote conveyors serving as conveying members to convey a substantially rectangular veneer sheet applied with an adhesive during the previous step (not shown) in an arrow direction. There are provided therein many discs  31   b ,  33   b  arranged on two shafts  31   a , and one shaft  33   a  at proper intervals along center lines of the shafts  31   a ,  33   a.    
     Also, as shown in FIG. 3, the shafts  31   a ,  33   a  are supported at their lower potions by outer peripheries of a pair of rotatable rolls  35  in order to reduce their flexures. 
     Furthermore, the right side end portions of the shafts  31   a ,  33   a  are cut into plate-like projecting portions  31   c ,  33   c  projecting in their axial directions. 
     Also, the shaft  33   a  is provided at its one portion with positioning collars  36  so as to sandwich the roll  35  at one position, such that the shaft  33   a  is restricted so as not to move in the axial center line direction. 
     Reference numeral  37  denotes a driving shaft formed with a recessed portion  37   a  which is engaged with one of the projecting portions  31   c ,  33   c  to transmit rotation to the one of the projecting portions  31   c ,  33   c , and the driving shaft  37  is rotatably supported by bearings  39  and it is transmitted with rotation of a motor  45  via a sprocket  41  and a chain  43 . 
     A shaft driving mechanism  46  is constituted by the above-described driving shaft  37 , bearings  39 , sprocket  41 , chain  43 , motor  45  and the like, and the conveyors  31 ,  33  are always rotated by the shaft driving mechanism  46  at a time of operation. 
     Provided on the left side end portion of each shaft  31   a  in FIG. 1 is an engagement body  51  which rotatably supports the shaft  31   a  which has an angular ball bearing (not shown) so as to move integrally in the axial center line direction according to rotation of a rotational shaft  59   a  of a motor  59  described later. As shown in FIG. 2, the engagement body  51  is provided with a flange portion  51   a  engaged with a joint  53  described later. 
     As shown in FIG. 2, reference numeral  53  is a joint having a flange portion  53   a  engaged with the flange portion  51   a  of the engagement body  51 . The left side end portion of the joint  53  and the right side end portion of each arm  55  are pin-connected to each other such that the arm  55  is mounted to be pivotable about the left side end portion of the joint  53  according to rotation of a rotational shaft  59   a  described later. Also, as shown in FIG. 1, the left side end portion of each arm  55  is rotatably mounted via a bearing (not shown) to a connection rod  57  provided eccentrically to the rotational shaft  59   a  of the motor  59 . 
     Reference numeral  61  denotes a detector such as a proximity sensor or the like, which is provided so as to correspond to one rotational shaft  31   a  and which outputs a detection signal when the rotational shaft  59   a  has rotated and the arm has moved to a position shown in FIG. 2, i.e., the arm  55  has moved to the leftmost position such that it is determined that the shaft  31   a  is positioned at an initial state where it has moved to the leftmost position. 
     The moving mechanism is constituted by the above-described engagement body  51 , joint  53 , arm  55 , connection rod  57 , motor  59 , detector  61  and the like. 
     Reference numeral  63  denotes a detector such as a proximity sensor or the like, which is arranged on an upstream side, taken in a conveying direction of a veneer sheet, of a position where blocking members  67  described later are located on a conveying path constituted by the conveyors  31 ,  33  and upward of the conveyors  31 ,  33 , and the detector  53  detects a downstream side end or a leading end of the veneer sheet being conveyed. 
     Reference numeral  65  denotes a detector such as a proximity sensor or the like which is arranged between the two shafts  31   a  above them, and it detects one side end of the veneer sheet taken in a direction perpendicular to the conveying direction of the veneer sheet, namely, a right side end of the veneer sheet in FIG.  1 . 
     Reference numeral  67  denotes a blocking member which can be reciprocated between a raised position where it abuts against the veneer sheet being conveyed to block its conveyance and a lowered position where the blocking member allows passing of the veneer sheet. In this embodiment, two blocking members  67  are provided so as to be spaced from each other properly in a direction perpendicular to the conveying direction. As shown in FIG. 3, each blocking member is mounted to an upper and distal end of an arm  68  which is rotatably supported about a shaft  69 . Then, two blocking members  67  are integrally moved to the both positions by the actuation of a cylinder  71 . 
     Also, a controller (not shown) is provided so as to actuate the cylinder  71  and the motor  59  on the basis of respective signals from the detectors  65 ,  67  to control the blocking member  67  and the shafts  31   a , respectively, as described later. Incidentally, a time T required for correcting the attitude of the veneer sheet described later is input and set in the controller in advance. 
     Since the embodiment of the present invention has been constituted in the above manner, its operation will be explained below. 
     In an initial state of an operation shown in FIG. 1, the both conveyors  31  stand by in a state where both the shafts  31   a  have been moved to the leftmost sides by rotating the rotational shaft  59   a  by the motor  59  and stopping the motor  59  when the arm  55  has been detected by the detector  61 , and the conveyors together with the conveyor  33  are always being rotated by the shaft driving mechanism  46 . Furthermore, the blocking members  67  stand by at the position where they block the conveyance of the veneer sheet by retracting operation of a rod of the cylinder  71 , as shown in FIG.  3 . 
     In this state, as shown in FIG. 4, when the veneer sheet  30  is conveyed by the conveyors  31 ,  33  and, for example, a right side end portion  30   a  of the veneer sheet  30  which is positioned on the downward side in the conveying direction abuts against the blocking member  67  positioned on the right side, the veneer sheet  30  is rotated in an arrow direction about the left side end portion  30   a  by a conveying force of the conveyors  31 , as shown in FIG.  5 . When the left side end portion  30   b  of the veneer sheet  30  on the downstream side approaches to the blocking member  67  positioned on the left side, the detector  63  detects the veneer sheet  30  and its detection signal is input into the controller. 
     When the veneer sheet  30  is further rotated, as shown in FIG. 6, the left side end portion  30   b  abuts on the left side control member  67  such that the rotation of the veneer sheet  30  is stopped and the attitude of the veneer sheet  30  is corrected. 
     After the time T required for correcting the attitude elapses from inputting of the detection signal to the controller, the rod of the cylinder  71  is extended according to a signal from the controller, as shown in FIG. 7 such that the blocking member  67  is rotated out of the conveying path downward, as shown with an arrow. There, the conveyance of the veneer sheet  30  is restarted by a conveying force from the conveyors  31 , namely, the veneer sheet  30  is conveyed in a direction of arrow Y shown in FIG.  7 . 
     Similarly, the motor  59  is rotationally driven according to a signal from the controller simultaneously with the conveyance in the direction Y. As shown in FIG. 8, the rotational shafts  31   a  which are rotated via the connection rod  57 , the arms  55 , the joints  53  and the engagement bodies  51  is moved to the left side, namely, the conveyors  31  are moved in a direction of arrow X. 
     As a result, the veneer sheet  30  is moved not only in the direction of arrow Y but also in the direction of arrow X in FIG.  8 . 
     When the detector  65  detects the right side end of the veneer sheet  30  according to these movements, a detection signal is output and input into the controller. 
     Then, a signal for stopping the motor  59  is output from the controller such that the movement of the conveyors  31  in the direction X is stopped and locating of the left side end portion of the veneer sheet  30 , i.e., the end portion thereof in the direction perpendicular to the conveying direction of the veneer sheet, is performed. 
     A shown in FIG. 9, when the veneer sheet  30  is further conveyed in the direction of arrow Y and the upstream side end of the veneer sheet in the conveying direction passes a position where the detector  63  is disposed, a detection signal outputted from the detector  63  to the controller is stopped. 
     At this time, when a signal for rotationally driving the motor  59  is outputted to the controller and the rotational shaft  59   a  is rotated, the connection rod  57 , the arms  55 , the joints  53 , the engagement bodies  51  and the conveyors  31  are moved to the left side in FIG. 9 to be returned back to their initial states such that the detector  61  detects the arm  55  at a position shown in FIG.  2 . When a detection signal which has detected the arm  55  is inputted into the controller, a signal for stopping the motor  59  is outputted from the controller, the connection rod  57 , the arms  55 , the joints  53 , the engagement bodied  51  and the conveyors  31  stop moving to the left side and they stand by in their initial positions. On the other hand, when a detection signal being outputted from the detector  63  is stopped, the controller outputs a signal for retracting the rod of the cylinder  71  to return the blocking member  67  to a position where it blocks the conveyance of a veneer sheet, as shown in FIG.  3 . 
     The same operation as the above is repeated for each veneer sheet, whereby the attitude of each veneer sheet to be conveyed is corrected and the veneer sheet is located such that the veneer sheet is conveyed to the next step. 
     In the above embodiment, since the attitude correction of the veneer sheet and the locating thereof in the direction perpendicular to the conveying direction are performed by the above-described operation of the conveyors  31  supporting the veneer sheet, they can be performed in a short time with a simple constitution to improve productivity. 
     Also, even when the veneer sheet has been applied with adhesive, it is conveyed by the discs  31   b ,  33   b  such that loss of the adhesive applied to the veneer sheet can be reduced. 
     Furthermore, since the conveyors  31 ,  33  are constituted such that they can be detached without using any tool, even when the discs  31   b ,  33   b  has been applied with the adhesive, they can be detached and cleaned. 
     Incidentally, the embodiment described above may be modified in the following manner. 
     1. In the above embodiment, the portions of the conveyors  31 ,  33  which support a veneer sheet are arranged so as to be positioned on substantially the same horizontal face, but such an arrangement can be employed that the portions of the conveyor  31  positioned on the upstream side in the conveying direction, which support a veneer sheet are higher than those of the conveyor  31  positioned on the downstream side in the conveying direction in order that a portion of a veneer sheet  30  which is positioned on the side of the blocking members  67  is inclined obliquely downward as shown in FIG.  10 . By employing such an arrangement, a time elapsed from abutting of a veneer sheet  30  on the conveyors  31 ,  31  to one blocking member  67  to abutting thereof against the other blocking member  67  is shortened to further improve productivity. 
     2. In the embodiment, locating of a veneer sheet in the direction perpendicular to the conveying direction thereof is performed by moving two conveyors  31  in their axial central line directions by means of the moving mechanism constituted by the engagement bodies  51 , the joints  53 , the arms  55 , the connection rod  57 , the motor  59 , the detector  61  and the like, but the following constitution can be employed. 
     As shown with a plan view in FIG. 11, only one conveyor  31  movable in left and right directions by a moving mechanism constituted by an engagement body  51 , a joint  53 , an arm  55 , a connection rod  57 , a motor  59 , a detector  61  or the like in the same manner as the embodiment is provided and a conveyor  33  similar to that of the embodiment is provided. 
     On the other hand, two pressing rolls  81 , each of which holds a veneer sheet in cooperation with one disc  31   b  of the conveyor  31  and can be opened, are provided above the conveyor  31  although not shown so as to be spaced from each other in left and right directions. 
     That is, as shown in FIG. 12 corresponding to a view as viewed in a D—D direction in FIG. 11, the pressing rolls  81  which are rotatable relative to the shaft  84  provided in a manner described later and are movable in their central line directions are arranged so as to be positioned just above two discs  31   b  selected from the discs of each conveyor  31  when the pressing rolls  81  are positioned to the left ends of the shafts  84  by compression springs  87  described later. 
     As shown in FIG. 13 corresponding to a view as viewed in an E—E direction in FIG. 11, each shaft  84  is fixed to a distal end of one of the two arms  83  rotatable about the rotational shaft  83   a , and the arm  83  is rotated together with the shaft  84  by actuation of the cylinder  85 . 
     Also, a resilient member whose strength has been considered, for example, a coil-like compression spring  87 , is provided in a state where it has been slightly deformed in a compressed manner so as to cover the shaft  84  such that, when each pressing roll  81  is not subjected to an external force acting in a horizontal direction, the pressing roll  81  is put at an initial state shown in FIG. 12, or it is positioned to the left end of the shaft  84 , and, when the conveyor  31  moves in the axial central line direction in a state where a veneer sheet has been held between the pressing roll  81  and the disc  31   b , as described later, the pressing roll  81  can be moved together by a frictional force received from the conveyor  31  via the veneer sheet. 
     Portions of this modified embodiment other than the above portions are constituted in the same manner as those in the embodiment, and locating in the direction perpendicular to the conveying direction are performed according to the following operations of respective members. 
     Both the pressing rolls  81  are ascended by retracting operations of the cylinders  85  and they are caused to stand by, as shown in FIG. 13, the conveyors are caused to stand by in the initial state shown in FIG. 12, and a veneer sheet  30  is conveyed by the conveyors  31 ,  33  like the above embodiment. Then, after the downstream side end of the veneer sheet  30  in the conveying direction abuts against the two blocking members  67  and the attitude of the veneer sheet is corrected, the blocking members  67  are rotated in a direction of arrow to the outside of the conveying path by extending operations of the cylinders  71 , as shown in FIG.  14 . 
     Also, simultaneously with the extending operations of the cylinders  71 , the rods of the respective cylinders  85  are extended to lower the pressing rolls  81  so that the veneer sheet  80  is held between the discs  31   b  and the pressing rolls  81 . 
     Next, the motor  59  is rotationally driven in an arrow direction like the embodiment such that one conveyor  31  is moved in the direction of arrow X, as shown in FIG.  15 . The veneer sheet  30  is conveyed in the direction Y shown in FIG. 8 according to rotation of the discs  31   b  and it is also moved in the direction X according to movement of the discs  31   b  to the direction X. For this reason, the pressing rolls  81  which have been brought into pressure-contact with the veneer sheet  30  are rotated by frictional force from the veneer sheet  30  and they are moved in the direction X along the shafts  84  together with the veneer sheet  30  while deforming the compression springs  87  in a compressing manner. 
     Next, when the detector  65  detects the right side end portion of the veneer sheet  30  moving in the direction Y shown in FIG.  7  and in the direction X, a detection signal is input to the controller and the motor  59  is stopped according to a signal from the controller. As a result, the locating of the veneer sheet  30  in the direction perpendicular to the conveying direction is performed. 
     Next, when the upstream side end of the veneer sheet  30  in the conveying direction passes the detector  63  according respective operations similar to those in the embodiment, any detection signal is not outputted from the detector  63  to the controller such that the motor  59  is rotationally driven according to a signal outputted from the controller and the rods of the cylinders are retracted to ascend the pressing rolls  81  from the state shown in FIG.  14 . Like the embodiment, the conveyor  31  is moved to the initial state and is caused to stand by, and the pressing rolls  81  are returned back to one end of the initial state along the shafts  84  by forces of the compression springs  87  because external forces acting in a horizontal direction is cancelled. 
     In the above modified embodiments, since the veneer sheet  30  is moved in the conveying direction and in the direction perpendicular thereto in the state where it has been held between the discs  31   b  and the pressing rolls  81 , the magnitude or valve of the frictional force acting from the discs  31   b  to the veneer sheet  30  can be increased such that accelerations to both the directions can be increased and productivity can further be improved by moving the veneer sheet in a shorter time. 
     3. In the modified embodiment where the pressing rolls  81  are provided, respective cylinders may be used as the returning members instead of the resilient members such as compression springs  87  or the like. 
     That is, as shown in FIG. 16, a cylinder  82  provided at its rod  82   b  extendable/retractable in directions of arrows with a plate  82   a  in a state where the plate can abut against the pressing roll  81 , and the cylinder  82  is rotated together with the arm  83  according to actuation of the cylinder  85 . 
     In this case, in a state that the cylinder  82  has been retracted to retreat the rod  82   b  each time when the conveyor  31  returns back to the left side initial state shown in FIG. 16, when the conveyor  31  which has held the veneer sheet in cooperation with the pressing rolls  81  moves in the direction perpendicular to the conveying direction, namely, it moves in the right direction on FIG. 16 such that the pressing rolls  81  are moved in the right direction in the above-described manner, the pressing rolls  81  do not come in contact with the plates  82   a  and they are not subjected to any resistance from the plates  82   a.    
     On the other hand, after the veneer sheet  30  held between the conveyor  31  and the pressing rolls  81  moves in the right direction and the detector  65  detects the right side end portion of the veneer sheet  30 , when the upstream side end or the trailing end of the veneer sheet  30  in the conveying direction passes below the detector  63  according to respective operations similar to those in the above-described embodiment, the cylinder  85  effects its retracting operation according to a signal from the controller and the cylinder  82  effects its extending operation slightly thereafter. Thereby, the pressing rolls  81  ascend and then the plates  82   a  move to the right side in FIG. 16 such that the plates  82   a  abuts against the pressing rolls  81  to move the pressing rolls  81  along the axes  84  to their original positions on the left side. 
     Also, in order to prevent the pressing rolls  81  with a veneer sheet held in cooperation with the conveyor  31 , which are moving in the direction perpendicular to the conveying direction from coming in contact with the plates  82   a , such a timing can be employed as a timing for retracting the cylinders  82  that the pressing rolls  81  are descended for holding a veneer sheet in cooperation with the conveyor  31  and simultaneously the rod  82   b  are retracted. 
     4. In the above modified embodiment, the pressing rolls  81  holding a veneer sheet in cooperation with the conveyor  31  are provided as separate members, but the following constitution can be employed. 
     That is, as shown in FIG. 17 which is a partial front view corresponding to FIG.  12  and in FIG. 18 as viewed in an F—F direction of FIG. 17, a left side lower end of a gate-like auxiliary stand  91  is coupled to the engagement body  51  described in FIGS. 11 and 12, a right side lower end thereof is coupled to a shaft  31   a  of the conveyor  31  via a bearing (not shown), and a guide member (not shown) is provided such that the auxiliary stand  91  is always positioned at an illustrated position above the conveyor  31  and it is movable in left and right directions in FIG.  17 . 
     A mounting stand  91   a  for arranging the pressing roll  81  just above one disc  31   b  is provided so as to extend in a vertically at a proper position in left and right directions in FIG.  17 . An arm  93  rotatable about a shaft  93   a  is generally horizontally mounted to the mounting stand  91   a , the arm  93  is provided at its right end with a pressing roll  81  similar to the above and is connected at an upper end of its left end to a distal end of a rod of a cylinder  95  coupled to the mounting stand  91   a . As a result, the pressing roll  81  is reciprocated between a position where it holds a single in cooperation with the disc  31   b  and a position where it is separated from the veneer sheet according to retracting and extending operations. 
     In such a constitution, when a veneer sheet is conveyed in the direction perpendicular to the conveying direction, since the disc  31   b , or the conveyor  31  and the pressing roll  81  are moved together with the conveyor  31 , the movement of the veneer sheet is conducted almost without any resistance, and returning members such as the compression spring  87 , the cylinder  82  and the like can be omitted. 
     5. In the above-described embodiment and modified embodiments, after the attitude of a veneer sheet has been corrected, for example, as shown in FIG. 7, a veneer sheet  30  is conveyed in the direction of arrow Y by extending the rods of the cylinders  71  to rotate the blocking members  67  in the direction of arrow to the outside of the conveying path and simultaneously it is conveyed in the direction of arrow X by rotationally driving the motor  59  shown in FIG. 8 to move the conveyors  31 , which are rotating via the connection rod  57 , the arms  55 , the joints  53  and the engagement bodies  51 , in the direction of arrow X. 
     Meanwhile, such a constitution can be employed that, after the attitude of a veneer sheet has been corrected, the blocking members  67  are first rotated in the direction of arrow to the outside of the conveying path to start conveyance of the veneer sheet  30  in the direction of arrow Y, and the motor  59  is then rotationally driven to move the conveyors  31  in the direction of arrow Y. 
     Also, such a constitution can be employed that, after the attitude of a veneer sheet  30  has been corrected, the motor  59  is first rotationally driven to start movement of the conveyors  31  in the direction of arrow X and the blocking members  67  are then rotated to the outside of the conveying path to convey the veneer sheet  30  in the direction of arrow Y. 
     6. In the above-described embodiment and modified embodiments, the conveyor  31  serving as the conveying member is always put in a rotating state, but it may be constituted such that it can be rotationally driven and stopped. 
     That is, in the modified embodiments explained with reference to FIGS. 15,  16 , for example, the conveyor  31  is constituted so as to be capable of being rotationally driven and stopped, in which respective members are operated in the following manner. 
     After the veneer sheet conveyed by the conveyor  31  abuts against two blocking members  67  and the attitude thereof is corrected like the above-described embodiment, the conveyor  31  is first stopped so that conveyance of the veneer sheet is suspended. Next, after the pressing rolls  81  are descended to hold the veneer sheet in cooperation with the conveyor  31 , the blocking members  67  are moved out of the conveying path. Then, rotational driving of the conveyor  31  is restarted and the conveyor  31  is moved in a direction perpendicular to the conveying direction of the veneer sheet so that locating of the veneer sheet in the direction X is completed. Thereafter, movement of the conveyor  31  in the direction perpendicular to the conveying direction is suspended. 
     Next, when the detector  63  detects that the veneer sheet held has passed through a predetermined position, the pressing rolls  81  are ascended according to a signal from the detector  63 , and the conveyor  31  is then moved to its original or home position in a direction inverse to the direction perpendicular to the conveying direction. With such a configuration, the correction of the attitude of the veneer sheet can be performed excellently and effectively. 
     7. When the pressing roll  81  and the disc  31   d  of the conveyor  31  holding a veneer sheet therebetween are constituted to be wider in the axial central line direction than those in the embodiment and projecting portions are formed on peripheral faces of the pressing roll  81  and the disc  31   b , locating of a veneer sheet can further securely be performed. 
     8. In the above embodiments, the conveyor  31  has been shown as one example of the conveying member, but such a constitution can be employed in this invention that a running or travelling body or member such as a belt, a chain or the like, which travels in the conveying direction of the veneer sheet is entrained between sprockets and the running body is movable in the direction perpendicular to the conveying direction like the above embodiments.