JP4522481B2 - Method and apparatus for unpacking plate stack - Google Patents

Description

  The present invention relates to a technique for separating and taking out a slip sheet and a plate-like object from a stack formed by alternately stacking plate-like objects and slip sheets. As a typical example of the plate-like material handled in the present invention, a glass substrate having a functional layer on the surface used for a color filter of a liquid crystal display, a thin film transistor (TFT), or the like can be given.

  It is important to transport and store a glass substrate having a functional layer on its surface, such as a glass substrate used for a color filter, without damaging or contaminating the functional layer on the surface. Therefore, for transporting and storing these glass substrates, a resin case provided with grooves for inserting the glass substrates one by one has been used. However, in this case, there is a problem that the storage efficiency is poor because the glass substrate is stored in a state where a gap is generated between the glass substrates. Therefore, the glass substrate is sealed with a PET film one by one, and the packaging form in which these are stacked (see Patent Document 1), the glass substrate is packaged one by one with a bag-like body made of a laminated film having an unevenly processed inner wall, A packaging form (see Patent Document 2) in which it is packed in a case, a packaging form in which a plurality of glass substrates and slip sheets are alternately stacked, and obliquely stacked on an oblique stacking pallet (see Patent Document 3), and the like have been proposed.

  However, all of these conventional techniques have problems. That is, as shown in Patent Documents 1 and 2, in a packaging form in which each glass substrate is sealed with a PET film or packaged with a bag-like body made of a laminate film, the packaging of the glass substrate takes a great deal of man-hours and packaging costs. There was a problem that became high. In addition, as shown in Patent Document 3, glass substrates and slip sheets are alternately stacked and stacked obliquely, and when the glass substrate becomes a large size, there is a risk of damage due to buckling or vibration due to its own weight. . In view of this, it is conceivable to carry a stack of glass substrates and slip sheets alternately held horizontally, but currently no device has been developed that separates and removes the glass substrates and slip sheets. There was a problem. In addition, the stacked body in which the glass substrates and the interleaving paper are alternately stacked sometimes causes a problem when the interleaving paper is peeled off during unpacking. In other words, the glass substrate is often provided with a water-soluble protective film to protect the functional layer on the surface during transportation, in which case the protective film may absorb moisture during transportation or storage. Not only does the protective film adhere to the protective film due to the moisture absorption of the protective film, it becomes difficult to peel off, but also the part of the glass substrate that adheres to the slip sheet is pulled up together when trying to peel the paper from the glass substrate. The glass substrate may be deformed and peeling may occur suddenly, giving an impact to the glass substrate, or the peeling position may move in an unstable manner, and the glass substrate may still be given an impact. Damage to the layer could occur.

JP 2003-237833 A Japanese Patent Laid-Open No. 11-1205 JP 2000-351449 A

  The present invention has been made in view of such problems, and a stack formed by alternately stacking plate-like objects such as glass substrates used for color filters and thin film transistors (TFTs) of liquid crystal displays and interleaf sheets in a horizontal or inclined manner. In this state, it is possible to alternately take out the interleaf and the plate from the upper surface of the stack, and even if the interleaf is adhered to the plate, It is an object of the present invention to provide a method and an apparatus for unpacking a plate stack that can be peeled off without damaging the plate.

  The invention according to claim 1 of the present invention, which has been made to solve the above problem, separates the slip sheet and the plate-like material from the stack formed by alternately stacking the plate-like material and the folded paper sheets. An unpacking method for taking out, the step of holding the stack in a horizontal or inclined state, and the tip of the upper piece of the folded paper positioned at the top of the stack sandwiched between a pair of nip rollers And with the top end of the upper piece of the interleaving paper held at a fixed position, the pair of nip rollers are rotated along the upper surface of the stack while rotating the interleaving paper piece between them. The sheet is run toward the fold position of the slip sheet, and the upper piece of the slip sheet is peeled off, and the slip sheet fed by the pair of nip rollers after the pair of nip rollers reaches the fold position of the slip sheet. While discharging A nip roller positioned rearward in the direction of travel from the crease position of the interleaving paper toward the front end along the upper surface of the stack while rotating the pair of nip rollers so as to feed out the interleaf sheet sandwiched between them. In a state where the sheet is separated from the upper surface of the stack, the nip roller positioned in front is pressed against the upper surface of the stack, and the lower side piece of the interleaving paper is peeled off and positioned at the top of the stack A method for unpacking a stack of plate-shaped objects having a step of taking out a plate-shaped object.

The invention according to claim 2 is an unpacking device that separates and removes the slip sheet and the plate-like material from the stack formed by alternately stacking the plate-like material and the slip sheet, and the stack is horizontally or A support table supported in an inclined state; a pair of nip rollers provided so as to be movable along the upper surface of the stack supported by the support table; In at least one of the nip roller moving means for reciprocating along the upper surface of the heavy body and the forward path and the backward path of the pair of nip rollers, the nip roller located behind in the traveling direction of the pair of nip rollers does not contact the upper surface of the stack in a state where the nip roller was away from the upper surface of the stack as a nip roller pressing means pressing the nip roller located in front on the upper surface of the stack, A rotational drive device that rotationally drives the pair of nip rollers at a speed synchronized with the moving speed of the nip roller, and when the pair of nip rollers are open at the leading edge position of the slip sheet, the leading edge of the slip sheet is An interleaving paper passing means for lifting and passing between the pair of nip rollers, an interleaving paper discharging means for discharging the interleaving paper peeled off from the surface of the platy material by the pair of nip rollers, and taking out the platy material after peeling the interleaving paper It is an unpacking device for a plate-like stack having plate-like material taking-out means.

  The invention according to claim 3 is the invention according to claim 2, wherein the nip roller pressing means is arranged such that the nip roller positioned in the forward direction in the forward path and the return path of the pair of nip rollers is the front of the stack. The pair of nip rollers is switched and pressed against the upper surface of the stack so that it can be pressed against the upper surface.

  The invention according to claim 4 is the invention according to claim 2 or 3, wherein the position of the upper surface of the stack holding the support table thereon is the position for separating the interleaf paper and the plate-like object. An elevating mechanism for elevating and lowering the support base is provided so as to be a position for taking out.

  The invention according to claim 5 is the invention according to any one of claims 2 to 4, wherein the slip sheet discharging means is disposed at a position where the slip sheet leading end can be passed by the slip sheet passing means. The configuration includes a pair of nip rollers.

  The invention according to claim 6 is the invention according to any one of claims 2 to 4, wherein the interleaf discharge means is positioned adjacent to a pair of nip rollers that reciprocate along the upper surface of the stack. It is configured to have an interleaf receiver that is provided and reciprocates together with the pair of nip rollers.

  The invention according to claim 7 is the invention according to any one of claims 2 to 6, wherein the plate-like object is a glass substrate provided with a functional layer.

  According to the method of the present invention, the stack formed by alternately stacking the plate-like object and the folded sheet of the folded paper is held in a horizontal or inclined state, and the slip sheet and the plate-like object are alternately placed from the upper surface. In addition, according to the apparatus of the present invention, a stack formed by alternately stacking plate-like objects and folded paper sheets, or a form that is not folded with plate-like objects. The stack formed by alternately stacking the slip sheets is held in a horizontal or inclined state, and the slip sheets and the plate-like objects can be alternately taken out from the upper surface. Furthermore, according to the method and apparatus of the present invention, when peeling the slip sheet from the surface of the plate-like object, the slip sheet is sandwiched by a pair of nip rollers, and the pair of nip rollers are rotated to feed the slip sheet upward. Since the pair of nip rollers are run along the upper surface of the stack while pressing the nip roller positioned in front of the traveling direction against the upper surface of the stack, for example, even if the interleaf is adhered to the surface of the plate-like object, A pair of nip rollers can apply a large tensile force to the interleaving paper to ensure peeling, and the separation point when the interleaving paper is peeled off from the plate is at the position where the nip roller presses the interleaf. For this reason, the peeling position moves stably with the movement of the nip roller, and the plate-like object is pressed by the nip roller at that position to prevent undesired deformation. Without causing, slip sheet is peeled smoothly from plate-like material. Thus, the slip sheet can be reliably peeled off without damaging the plate-like object.

  The plate-like object to be handled in the present invention is arbitrary, but it is preferably a glass substrate provided with a functional layer used for a liquid crystal display or the like, and thereby, a glass substrate provided with a functional layer that is easily damaged and Without causing damage to the glass substrate from the stack with the interleaving paper, the interleaving paper can be peeled off and taken out, and then the glass substrate can be taken out.

(A) is a schematic perspective view showing a stacking object to be unpacked on a pallet, and (b) is a schematic side view showing a part of the stacking enlarged. Schematic cross-sectional view showing an enlarged glass substrate and slip sheet Schematic plan view of an unpacking device according to an embodiment of the present invention and devices arranged in the periphery Schematic side view of the device shown in FIG. The schematic side view which shows the part which peels a slip sheet of the unpacking apparatus shown in FIG. 3 in a different operating state. (A), (b), (c), (d) is a schematic side view for explaining the procedure for removing the interleaving paper from the uppermost part of the stack using folded paper. (A), (b), (c) is a schematic side view for explaining the procedure of removing the slip sheet from the uppermost part of the stack and then taking out the glass substrate following the step shown in FIG. (A), (b), (c), (d) is a schematic side view for explaining the procedure for removing the interleaving paper from the top of the stack using interleaving interleaving paper (A), (b), (c) is a schematic side view for explaining the procedure of removing the slip sheet from the uppermost part of the stack and then taking out the glass substrate following the step shown in FIG. (A), (b), (c), (d) are obtained from the uppermost part of the stack using the folding paper folded in half by the unpacking device according to the embodiment different from FIGS. Schematic side view explaining the procedure for peeling paper (A), (b), (c) is a schematic side view for explaining the procedure for removing the slip sheet from the top of the stack following the step shown in FIG. 10 and then removing the glass substrate.

  Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 (a) is a schematic perspective view showing an example of a stack to be unpacked on a pallet, and FIG. 1 (b) shows a part of the stack as a plate-like object or slip sheet. It is a schematic side view exaggerating and showing the thickness. Reference numeral 1 denotes a stack formed by alternately stacking plate-like objects 3 and interleaf sheets 4, and 2 denotes a pallet on which the stack 1 is placed. The plate-like object 3 used for the stack 1 is a glass substrate used for a color filter, a thin film transistor (TFT) or the like of a liquid crystal display, and as shown in FIG. Provided with a functional layer 3b (for example, in the case of a substrate for a color filter, a layer provided with a black matrix, a colored pixel, an ITO electrode, etc.) and further protection for preventing damage during storage and transportation A film 3c is formed. The protective film 3c is made of a material that can be easily formed and easily removed, and a water-soluble resin (for example, polyvinyl alcohol) is often used. The interleaf paper 4 is provided so as to protect the functional layer 3b and the protective film 3c of the plate-like object 3 (hereinafter referred to as a glass substrate) 3. Arranged in a folded form. Here, the reason why the interleaf paper 4 is arranged in a folded form is as follows. That is, when the protective film 3c absorbs moisture and melts during transportation of the stack 1, the protective film 3c may adhere to the interleaf. However, as shown in FIG. In the folded form, even if the lower piece 4a is bonded to the protective film 3c, the upper piece 4b is not bonded. For this reason, the tip of the upper piece 4b is covered with a suction pad or the like. This is because it can be easily lifted. Note that paper, a resin sheet, a foamed resin sheet, or the like is used for the interleaving paper 4.

  FIG. 3 is a schematic plan view of an unpacking device used for separating and taking out the interleaving paper 4 and the glass substrate 3 from the stack 1 shown in FIG. 1, and a device arranged in the vicinity thereof, and FIG. 4 is a schematic side view thereof. It is. 3 and 4, 10 is an unpacking device, 11 is a stack conveying device that feeds the pallet 2 with the stack 1 placed on the unpacking device 10, 12 is a pallet discharging device that sends out the pallet 2 that has been emptied, 13 Is a slip-sheet receiver for accommodating slip-sheets taken out by the unpacking device 10, and 14 is a substrate transport device for transporting the glass substrate 3 taken out by the unpacking device 10 toward a desired place of use.

  The unpacking device 10 includes a support base 21 that horizontally supports the pallet 2 on which the stack 1 is placed, and a top surface position of the stack 1 on which the support base 21 is placed. And an elevating mechanism (not shown) for raising and lowering the glass substrate to a position for taking out the glass substrate, and a first nip roller for discharging the slip sheet peeled off from the surface of the glass substrate at the top of the stack to the slip sheet receiver 13 The pair 24, the second nip roller pair 25 for peeling the slip sheet from the uppermost glass substrate 3, and the tip end portion of the slip sheet 4 on the upper surface of the stack 1 are sucked and held, and the first nip roller pair 24 and the second nip roller pair 24 A suction pad 26 that constitutes a slip-sheet passing means that passes through a pair of nip rollers, a plate-like material take-out means 27 that takes out the glass substrate 3 from the stack 1 and sends it to the substrate transport device 14, and the like.

  The first nip roller pair 24 constitutes a slip sheet discharging means for discharging the slip sheet peeled off by the second nip roller pair 25 to the slip sheet receiver 13, and as shown in FIG. In the state where the upper surface of the stack 1 placed on the sheet is positioned at the position for peeling the interleaf, the tip of the interleaf 4 that is slightly folded over the upper surface of the stack 1 and folded in half (the end opposite to the fold) Part) in the vicinity. The first nip roller pair 24 includes a pair of nip rollers 24a and 24b, an opening / closing mechanism (not shown) that opens and closes the nip rollers 24a, 24b, and a rotation driving device (not shown) that rotates to discharge the slip sheet. Yes. An appropriate guide and interleaf transport are provided between the first nip roller pair 24 and the slip sheet receiver 13 so that the slip sheet 4 discharged by the first nip roller pair 24 can be surely discharged to the slip sheet receiver 13. A roll group, an interleaf transport belt, and the like may be provided as necessary.

  The second nip roller pair 25 is provided so as to reciprocate horizontally along the upper surface of the stack 1 between the first nip roller pair 24 and the upper surface of the stack 1, and the pair of nip rollers 25a and 25b are connected to each other. I have. As shown in FIGS. 5A and 5B, the second nip roller pair 25 is held by a moving frame 30, and the moving frame 30 is reciprocated horizontally by a driving device (not shown). It has become. One nip roller 25 b is held by a swing lever 31 that is swingably held by the moving frame 30, and the other nip roller 25 a is held by a swing arm 32 that is swingably held by the swing lever 31. The swing lever 31 and the swing arm 32 are configured to be swung by air cylinders 33 and 34, respectively. With this configuration, the swing arm 32 can be swung by the air cylinder 34 to open and close the nip rollers 25a and 25b, and the swing lever 31 can be swung by the air cylinder 33 so that one of the nip rollers 25a A state in which the other nip roller 25b is separated from the upper surface of the stack 1 (see FIG. 5A) and one nip roller 25a is separated from the upper surface of the stack 1, and the other nip roller 25b is The state can be switched to a state of pressing on the upper surface (see FIG. 5B). Here, when the pair of nip rollers 25a and 25b move along the upper surface of the stack 1, the air cylinder 33 presses the nip roller positioned forward in the traveling direction against the upper surface of the stack 1, and the other nip roller is stacked. Accordingly, the nip roller located at the rear of the pair of nip rollers with respect to the traveling direction is separated from the upper surface of the stack, and the nip roller located at the front is moved away from the top of the stack. A nip roller pressing means for pressing the upper surface is configured. The nip rollers 25a and 25b of the second nip roller pair 25 are connected to a rotation driving device such as a motor that rotates at a speed synchronized with the moving speed when the nip rollers 25a and 25b move along the upper surface of the stack.

  4 and 6, when the first nip roller pair 24 and the second nip roller pair 25 are both open, the suction pad 26 sucks and holds the leading end of the piece 4b of the interleaf paper 4, and then pivots upward to join the suction pad 26. The leading end of the paper 4 can pass through the first nip roller pair 24 and the second nip roller pair 25. It should be noted that the suction pad 26 is not limited to turning, and may simply be moved up and down.

  In FIG. 4, the plate-like material taking-out means 27 includes a take-out head 37 having a large number of suction pads 36 for sucking and holding the glass substrate 3, and the take-out head 37 as shown in FIG. It moves from the side of the heavy body 1 to the upper side of the stacked body 1, then descends to a position for holding the glass substrate by suction, then rises to the original position, moves to the upper side of the substrate transfer device 14, and then moves the glass substrate to the substrate A take-out head moving device (not shown) or the like that moves the take-out head 37 is provided so as to perform a movement of lowering to a position on the transport device 14 and then raising to the original position.

  Next, the unpacking operation by the unpacking apparatus 10 having the above configuration will be described. In FIG. 3, the pallet 2 on which the stack 1 is placed is supplied from the stack transport device 11 onto the support 21 of the unpacking device 10. Next, as shown in FIG. 6A, the uppermost interleaf paper 4 of the stack 1 is lifted to a predetermined height position, and the first nip roller pair 24 and the second nip roller pair 25 are both open. Then, the suction pad 26 descends and holds the tip of the upper piece 4b of the interleaf paper 4 by suction, then lifts it and passes it between the first nip roller pair 24 and the second nip roller pair 25 in the opened state. At this time, as described above, the upper piece 4b of the interleaving paper 4 is not bonded to the lower piece 4a and can be easily lifted. Next, as shown in FIG. 6B, the first nip roller pair 24 and the second nip roller pair 25 are closed, and the interleaf sheet 4 is added. At the same time, in FIG. 5, the air cylinder 33 is operated to swing the swing lever 31 to the position shown in FIG. 5A, and the nip roller 25 a located on the right side in the drawing is pressed against the upper surface of the stack 1. State. Next, as shown in FIGS. 5 (a) and 6 (c), the second nip roller pair 25 starts moving in the right direction, and each nip roller 25a, 25b has a rotational speed (circumferential speed) synchronized with the moving speed. The upper piece 4b of the interleaf paper 4 is peeled off. At this time, the nip rollers 24a and 24b of the first nip roller pair 24 are held in a stopped state, and only the leading edge of the interleaf paper 4 is grasped.

  As shown in FIG. 6 (d), when the second nip roller pair 25 reaches the crease position of the interleaf paper 4, the movement is stopped and the air cylinder 33 (see FIG. 5) is actuated to operate the swing lever 31 in FIG. The nip roller 25b located on the left side in the drawing is pressed against the upper surface of the stack 1 by swinging to the position shown in FIG. Next, as shown in FIGS. 5B and 7A, the second nip roller pair 25 starts moving leftward, and each nip roller 25a, 25b rotates at a rotational speed synchronized with the moving speed. Then, the lower piece 4a of the interleaving paper 4 is peeled off. At this time, the nip rollers 24a and 24b of the first nip roller pair 24 are rotated at a rotational speed (circumferential speed) twice that of the nip rollers 25a and 25b of the second nip roller pair 25 and are peeled off. The slip sheet 4 is fed onto the slip sheet receiver 13. By the way, as described above, the lower piece 4a of the interleaf paper 4 may be adhered to the protective film 3c (see FIG. 2) of the glass substrate 3, but in this unpacking apparatus, as shown in FIG. As shown, since the piece 4a of the interleaf paper 4 is peeled off by the pair of nip rollers 25a and 25b, the interleaf paper 4 can be reliably peeled off by applying a large tensile force. In addition, when the interleaf sheet 4 is peeled off, the nip roller 25b located on the front side in the moving direction moves while pressing the interleaf sheet 4 against the glass substrate 3. The position at which the interleaf paper 4 is pressed against the glass substrate 3 is regulated. For this reason, the peeling position moves stably with the movement of the nip roller 25b, and at that position, the glass substrate 3 is pressed by the nip roller 25b to prevent undesired deformation. Therefore, the interleaving paper 4 is smoothly peeled off from the glass substrate 3 without causing impact or vibration on the glass substrate 3. Thus, the interleaving paper 4 can be reliably peeled without damaging the functional layer of the glass substrate 3.

  After the second nip roller pair 25 has moved to the leading end position of the interleaf paper 4 as shown in FIG. 7B and the interleaf paper 4 has been removed, the stack 1 is lowered as shown in FIG. Then, the take-out head 37 positioned at the take-out position for taking out the uppermost substrate 3 and then waiting on the side of the stack 1 moves down above the stack 1 and then moves down to the glass. The substrate 3 is sucked and held, then lifted, moved to above the substrate transfer device 14 (see FIG. 4), and then lowered again to place the glass substrate on the substrate transfer device 14. Thereafter, the take-out head 37 returns to the standby position for the next take-out, and the stack 1 again moves up to the slip-sheet take-out position shown in FIG. 6A, and the above operation is repeated to take out the slip sheet 4. By repeating the above operation, the interleaving paper 4 and the glass substrate 3 are alternately taken out from the pallet 2, and the taken-out glass substrate 3 is sent to a predetermined place of use by the substrate carrying device 14 shown in FIG. . After all the interleaving paper and the glass substrate of the stack 1 are taken out, the empty pallet 2 is sent out to the pallet discharging device 12.

  In the operation described above, as shown in FIG. 5A, when the pair of nip rollers 25a and 25b move rightward in the drawing in order to peel off the upper piece 4b of the interleaving paper 4, The nip roller 25a located on the front side is pressed against the upper surface of the stack 1 to regulate the peeling position of the piece 4b of the interleaf paper 4, but the piece 4b is not necessarily bonded to the lower piece 4a. It is not necessary to hold the piece 4b with the nip roller 25a and stabilize the peeling position. Therefore, when the piece 4b is peeled off, the nip rollers 25a and 25b may be positioned away from the upper surface of the stack 1. Accordingly, the nip rollers 25a and 25b do not necessarily have to be alternately pressed against the upper surface of the stack. When only the nip rollers 25b are necessary (when the piece 4a that may adhere to the glass substrate 3 is peeled off). ) To the upper surface of the stack, and the other nip roller 25a may be always changed to a position away from the upper surface of the stack. However, as shown in the illustrated embodiment, if the nip rollers 25a and 25b are configured to be switched so that they are alternately pressed against the top surface of the stack, the interleaf paper 4 is not only folded in two but also folded. It can also be used in the case of a state one. Hereinafter, the unpacking operation in that case will be described.

  8 and 9, the stack 1 </ b> A is formed by alternately stacking glass substrates 3 and unfolded slip sheets 4 </ b> A. First, as shown in FIG. 8A, the uppermost interleaf paper 4A of the stack 1A is lifted to a predetermined height position and the first nip roller pair 24 and the second nip roller pair 25 are both open. The suction pad 26 is lowered to suck and hold the leading edge of the interleaf 4A, and then lifted and passed between the first nip roller pair 24 and the second nip roller pair 25 in the opened state. Next, as shown in FIG. 8B, the first nip roller pair 24 and the second nip roller pair 25 are closed, and the slip sheet 4A is added. At the same time, the air cylinder 33 (see FIG. 5) is actuated so that the right nip roller 25a of the second nip roller pair 25 is pressed against the upper surface of the stack 1A. Next, as shown in FIG. 8C, the second nip roller pair 25 starts to move in the right direction, and the nip rollers 25a and 25b rotate at a rotational speed synchronized with the moving speed, so that the interleaf paper 4A is rotated. The glass substrate 3 is peeled off. At this time, even if the interleaving paper 4A is adhered to the glass substrate 3, since the nip roller 25a regulates the peeling position, the peeling occurs stably and the glass substrate 3 is not damaged. It should be noted that while the second nip roller pair 25 is moving in the right direction, the first nip roller pair 24 is held in a non-rotating state, and merely holds the leading edge of the interleaf sheet 4A.

  As shown in FIG. 8D, when the second nip roller pair 25 reaches the other end position of the interleaf paper 4A and the interleaf paper 4A has been peeled off, as shown in FIG. The nip rollers 24a and 24b start to rotate, and the peeled slip sheet 4A is fed onto the slip sheet receiver 13. At the same time, the second nip roller pair 25 moves leftward and returns to the original position. Then, as shown in FIG. 9B, after the discharge of the interleaf paper 4A is finished and the second nip roller pair 25 returns to the original position, the stack 1 is lowered as shown in FIG. 9C. Then, it is positioned at a take-out position for taking out the uppermost glass substrate 3, and then the take-out head 37 waiting on the side of the stack 1A is operated to take out the glass substrate 3 from the stack 1A. It supplies to the board | substrate conveyance apparatus 14 (refer FIG. 4). By repeating the above operation, the interleaving paper 4A and the glass substrate 3 can be separated and taken out from the stack 1A using the interleaving interleaf paper 4A.

  As described above, the unpacking device 10 according to this embodiment can be used both when the folded paper 4 is used and when the unfolded paper 4A is used. However, the unpacking apparatus of the present invention is not necessarily limited to such a combination, and can be configured to be used only for unpacking the stack 1A using the unfolded interleaving paper 4A. It is. In that case, a structure in which only one nip roller 25a of the second nip roller pair 25 can be pressed against the upper surface of the stack is sufficient.

  Further, in the above-described embodiment, the interleaf discharge means for discharging the peeled interleaf paper 4 is provided with the nip roller pair 24, but the interleaf discharge means is not limited to this, and other It is good also as a structure. 10 and 11 show an embodiment using a slip sheet discharging means having another structure. In the embodiment shown in FIGS. 10 and 11, the interleaf discharge means is provided at a position adjacent to the pair of nip rollers 25a and 25b provided to move along the upper surface of the stack, and the pair of nip rollers The interleaf receiver 40 that moves together with the interleaf 25 a and 25 b is used, and the suction pad 26 that adsorbs and holds the tip of the interleaf paper 4 and passes between the pair of nip rollers 25 a and 25 b is also horizontally disposed along the interleaf receiver 40. It has a movable configuration.

  The operation of taking out the interleaving paper 4 and the glass substrate 3 from the stack 1 using the folding paper 4 folded by the unpacking apparatus shown in FIGS. 10 and 11 is performed as follows. That is, as shown in FIG. 10A, the suction pad 26 is lowered in a state where the uppermost interleaf paper 4 of the stack 1 is lifted to a predetermined height position and the nip roller pair 25 is open, The tip of the upper piece 4b of the interleaving paper 4 is sucked and held, and then lifted and passed between the pair of nip rollers 25 in an open state. Next, as shown in FIG. 10B, the nip roller pair 25 is closed and the interleaf 4 is added, and at the same time, the nip roller 25 a located on the right side in the drawing moves to a position where the upper surface of the stack 1 is pressed. Next, as shown in FIG. 10C, the nip roller pair 25 and the slip sheet receiver 40 start moving in the right direction, and the nip rollers 25a and 25b are rotated at a rotation speed synchronized with the movement speed. The strip 4b on the upper side of 4 is peeled off, and the slip sheet receiver 40 enters underneath. At this time, the suction pad 26 is stopped in a state where the tip of the piece 4b of the interleaf paper 4 is held.

  As shown in FIG. 10D, when the pair of nip rollers 25 reaches the crease position of the interleaf paper 4, the movement is stopped and the nip roller 25a located on the right side in the drawing is separated upward from the upper surface of the stack 1. The nip roller 25b located on the left side is pressed against the upper surface of the stack 1. Next, as shown in FIG. 11A, the pair of nip rollers 25 starts to move leftward, and the nip rollers 25a and 25b rotate at a rotational speed synchronized with the moving speed. The piece 4a is peeled off. At the same time, the suction pad 26 holding the leading edge of the slip sheet 4 moves to the left at a speed twice as fast as the moving speed of the nip roller pair 25, and puts the slip sheet 4 on the slip sheet receiver 40. Then, as shown in FIG. 11B, after the pair of nip rollers 25 has moved to the leading end position of the interleaf sheet 4 and the interleaf sheet 4 has been peeled off, the interleaving interleaf sheet 4 is sent out to the interleaf sheet receiver 40. 11 (c), the stack 1 descends and is positioned at the take-out position for taking out the uppermost glass substrate 3, and then the take-out waiting on the side of the stack 1 is taken out. The head 37 operates to take out the uppermost glass substrate 3 of the stack 1. In parallel with this operation, the suction pad 13 that previously sent the interleaving paper 4 to the interleaving paper receiver 40 returns to above the nip roller pair 25. Thereafter, the stack 1 again rises to the slip sheet take-out position shown in FIG. 10A, and the slip sheet 4 is taken out by repeating the above-described operation. As described above, the interleaving paper 4 and the glass substrate 3 can be alternately taken out from the stack 1 on the pallet 2.

  FIGS. 10 and 11 explain the operation when taking out the folded sheet 4 in a folded manner, but the same operation is performed on the stack using the unfolded forms. Interleaving paper and glass substrate can be taken out alternately.

  In the above-described embodiment, the support base 21 that supports the stacks 1 and 1A is moved up and down, and the upper surface of the stacks 1 and 1A is positioned for taking out the slip sheets and the position for taking out the glass substrate. However, the support base 21 may be fixed at a fixed position and the first nip roller pair 24, the second nip roller pair 25, the suction pad 26, and the like may be moved up and down.

  In the above description, the slip sheets and the glass substrate are taken out while the stacks 1 and 1A are held horizontally. However, the stacks 1 and 1A are not necessarily horizontal and the stack 1 You may change so that 1A may be kept in the state which inclined. That is, the present invention can be applied even when the stacks are stacked obliquely. In addition, although a preferred embodiment of the present invention has been described by taking the case of unpacking a stack of glass substrates as an example, the plate-like object to be unpacked in the present invention is not limited to a glass substrate, Any layer may be used as long as it is alternately stacked to form a stack. Furthermore, it goes without saying that the present invention is not limited to the embodiment described above, and can be appropriately changed within the scope of the claims.

DESCRIPTION OF SYMBOLS 1, 1A Stack 2 Pallet 3 Glass substrate 3a Substrate body 3b Functional layer 3c Protective film 4, 4A Interleaf 4a, 4b Folded piece 10 Unpacking device 11 Stack transport device 12 Pallet ejecting device 13 Interleaf receiving 14 Substrate Conveying device 21 Support base 24 First nip roller pair 24a, 24b Nip roller 25 Second nip roller pair 25a, 25b Nip roller 26 Adsorption pad 27 Plate-shaped object takeout means 30 Moving frame 31 Oscillating lever 32 Oscillating arm 33, 34 Air cylinder 37 Ejecting Head 40 slip paper receiver

Claims (7)

  It is an unpacking method for separating and taking out a slip sheet and a plate-like material from a stack formed by alternately stacking plate-like objects and two-folded slip sheets, wherein the stack is horizontally or inclined. Holding the tip of the upper half of the folded sheet located between the uppermost parts of the stack, and holding the tip of the upper piece of the slip sheet in a fixed position. In this state, the pair of nip rollers are rotated toward the crease position of the slip sheet along the upper surface of the stack while rotating the pair of nip rollers so as to feed the slip sheet sandwiched between them. And the pair of nip rollers sandwiched between the pair of nip rollers while discharging the slip sheet fed by the pair of nip rollers after the pair of nip rollers reach the crease position of the slip sheet. Send a piece of A nip roller located rearward with respect to the traveling direction from the crease position of the interleaving paper toward the leading edge along the upper surface of the stack, while being rotated so that the nip roller is separated from the upper surface of the stack. A nip roller that presses against the upper surface of the stack and strips the lower piece of the interleaving paper; and a step of taking out the plate located at the top of the stack. Unpacking method. An unpacking device for separating and taking out a slip sheet and a plate-like object from a stack formed by alternately stacking a plate-like object and a slip sheet, and supporting the stack in a horizontal or inclined state And a pair of nip rollers that are movably provided along the upper surface of the stack supported by the support, and reciprocate the pair of nip rollers along the upper surface of the stack. The nip roller moving means and at least one of the forward path and the return path of the pair of nip rollers, the nip rollers are placed on the stack so that the nip rollers positioned behind in the traveling direction of the pair of nip rollers do not contact the upper surface of the stack. A nip roller pressing means for pressing a front nip roller against the upper surface of the stack in a state separated from the upper surface of the stack, and the pair of nip rollers A rotation drive device that rotates at a speed synchronized with the moving speed of the nip roller, and when the pair of nip rollers are open at the leading edge position of the slip sheet, the leading edge of the slip sheet is lifted, Interleaving paper passing means for passing between the nip rollers, interleaving paper discharging means for discharging the interleaving paper peeled off from the surface of the platy material by the pair of nip rollers, and platy material taking out means for taking out the platy material after peeling the interleaving paper A device for unpacking plate-like objects having a stack.   The nip roller pressing means switches the pair of nip rollers to the upper surface of the stack so that the nip roller positioned in the forward direction can be pressed against the upper surface of the stack in both the forward path and the return path of the pair of nip rollers. The unpacking device for a plate-like stack according to claim 2, wherein the unpacking device is configured to be pressed.   Furthermore, an elevating mechanism for raising and lowering the support base is provided so that the upper surface position of the stack holding the support base is a position for peeling the interleaf and a position for taking out the plate-like object. The unpacking device for a plate-like stack according to claim 2 or 3.   The said slip sheet discharge | emission means is provided with a pair of nip roller arrange | positioned in the position which can let the front-end | tip of a slip sheet pass by the said slip sheet passing means. Unpacking device for stacks of plates.   3. The interleaf sheet discharge means is provided at a position adjacent to a pair of nip rollers that reciprocate along the upper surface of the stack, and has an interleaf receiver that reciprocates with the pair of nip rollers. The unpacking device for the stack of plate-like objects according to any one of 4.   The unpacking device for a plate-shaped stack according to any one of claims 2 to 6, wherein the plate-shaped material is a glass substrate provided with a functional layer.

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