JP3526952B2 - Pallet unloader sheet holding device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pallet for extruding containers onto a discharge conveyor sequentially from a pallet in which containers such as bottles are stacked in a plurality of stages via intermediate sheets. It relates to an unloading device. More specifically, the present invention relates to a sheet holding device for holding a sheet so that an intermediate sheet between containers or a final sheet between a lowermost container and a pallet does not move together with the pushing operation of the container during the unloading operation. . 2. Description of the Related Art Conventionally, in this type of bulk pallet unloading apparatus, as a means for preventing a problem that the intermediate sheet is moved together with the pushing operation of the load, a rear portion of the intermediate sheet is sandwiched. What is sandwiched between pieces (JP-B-59-30620, JP-B-63-38)
No. 13) and a device that holds a holding piece between a holding piece and a lower container (Japanese Utility Model Publication No. 2-45222) are known.
In this case, in the latter type, since the opposing side of the holding means is the lower container itself, the holding action is more stable in the former type of holding between the holding pieces. Incidentally, the former type is also employed in the present invention. Furthermore, in these intermediate sheet holding devices, various measures have been taken to secure a gripping margin at the time of holding so that the holding piece does not hinder the container from tipping over when holding the intermediate sheet. For example, a predetermined-shaped projection member is pressed against a container to form a predetermined grip margin between the containers, or the holding means side is movably supported, and the holding means is brought into contact with the container by a recoil. The side is moved so that it can be pinched without any trouble. In this type of bulk pallet unloading apparatus, a sheet, that is, a final sheet may be laid between the lowermost container and the pallet. In such a case, in addition to the above-described gripping margin for holding the intermediate sheet, it is necessary to consider the holding of the final sheet between the lowermost container and the pallet. However, the prior art described above has not taken sufficient measures for holding the final sheet, aside from holding the intermediate sheet. The present invention has been made in view of such circumstances, and as described above, a sheet holding device that satisfies the following points in a device that clamps the rear portion of an intermediate sheet between clamping pieces in which the clamping state is more stable. It is intended to provide. (1) A predetermined gripping margin is secured at the rear part of the intermediate sheet between the containers, so that the container can be prevented from tipping over when being clamped. (2) The last sheet can be held between the lowermost container and the pallet without any trouble. [0004] The present invention provides an extruding mechanism for sequentially extruding containers stacked in a plurality of stages on a pallet via an intermediate sheet from an uppermost stage onto a discharge conveyor, and an extruding mechanism using the extruding mechanism. In a sheet holding device of a pallet unloading device provided with a sheet gripper comprising upper and lower holding pieces for holding a rear portion of the intermediate sheet when pushing out a container, the lower holding piece is located at an uppermost stage and an intermediate stage. In the unloading operation, the sheet gripper is configured to advance in a predetermined inclined state when the advancing of the sheet gripper and to push the leading end portion between the containers. Configured as
It is characterized in that the final sheet is held between the upper holding piece and the pallet. According to the present invention, in the unloading work at the uppermost stage and the middle stage, the lower holding piece constituting the sheet gripper is advanced in a predetermined inclined state when the sheet gripper is advanced. Since the leading end is configured to be pushed between the containers, the pushing action of the leading end of the lower holding piece pushes the container away, thereby securing a sheet-holding margin. Therefore, when the rear portion of the intermediate sheet is subsequently sandwiched by the sandwiching pieces, a gripping margin of the upper sandwiching piece is secured between the containers on the intermediate sheet, and it is not necessary to push back the container, It is possible to prevent the container from being overturned, which is likely to be caused by pushing the upper holding piece between the unsupported containers placed on the intermediate sheet. Also,
In the unloading work of the final stage, the lower holding piece is configured to move forward with it suspended or retracted backward,
Since the last sheet is sandwiched between the upper holding piece and the pallet, more accurate holding of the last sheet is possible. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a main part of the present embodiment, and FIG.
3 and 4 are a plan view and an elevation view showing the seat grip mechanism. In the drawing, reference numerals 1 and 2 denote seat grip mechanisms, which are supported on support shafts 3 and 4 arranged in parallel so as to be adjustable in position. Both ends of the support shafts 3 and 4 are supported by left and right support shafts 5 and 6 so as to be slidable back and forth. Further, racks 7 and 8 are provided at both ends of the support shafts 3 and 4, and are linked to each other via pinions 10 and 11 provided on the fixed rotating shaft 9. With this linking mechanism, the support shafts 3 and 4 are interlocked by the rack and pinion mechanism at both ends via the fixed rotation shaft 9, so that even when a driving force is applied to one end by the driving air cylinder 12, both the shafts are rotated. Can realize smooth translation. In the drawing, 13 is a fixed frame of the apparatus, 14 is an intermediate sheet,
Reference numeral 15 denotes a guide member.
17, is attached to the support shaft 3 and advances with the seat grip mechanisms 1, 2, as described later.
Is configured to function as a guide that regulates the rear end of the container group below the container group. Next, the seat grip mechanism will be described with reference to FIGS. Here, the seat grip mechanism 1 will be described as an example, but the same applies to the seat grip mechanism 2. As shown in FIG. 3, the sheet gripper for holding the intermediate sheet 14 and a later-described final sheet includes upper and lower holding pieces 18 and 19. These upper and lower holding pieces 1
8 and 19 are made of a material such as a synthetic resin which does not easily damage the container, and are formed in a tapered shape as shown in FIG. With this configuration, the sheet gripper is advanced at a relatively low speed and the front end is pushed between the containers while the holding pieces 18 and 19 are inclined at a predetermined inclination angle, and the container is pushed away by the tapered portion of the front end. It is configured to form a gripping margin. These upper and lower holding pieces 18 and 19 are connected to side plates 20 and 21 supported at regular intervals.
It is supported so as to be openable and closable by a rotating shaft 22 disposed therebetween. That is, the upper holding piece 18 is rotatably fitted to the rotating shaft 22 so as to be rotatable, and is configured to be rotated by an air cylinder (not shown) in two modes of an inclined state and a holding state. In addition, the lower holding piece 19 is fixed to the rotating shaft 22, and the two-stage operation of the air cylinder 25 is performed by the two-stage operation of the air cylinder 25 via the gear 23 and the toothed lever 24 fixed to the rotating shaft 22. In addition, it is configured to be able to rotate in three modes in which a hanging state or a backward retracting state is further added. In the drawing, reference numeral 26 denotes a handle for clamping the support shafts 3 and 4. Next, the operation of the sheet holding apparatus will be described. 4 and 7 show the operation state of the present sheet holding apparatus. FIGS. 4 and 5 show the case where the intermediate sheet is held, and FIGS. 6 and 7 show the case where the last sheet is held. . As is well known, when the actual pallet in which the containers 28 are stacked on the pallet 27 via the intermediate sheet 14 is transferred to the unloading position, the uppermost container 28 is raised to a predetermined extrusion height by a lift mechanism (not shown). Then, the unloading work is sequentially performed. Thus, when the uppermost container 28 is raised to the extrusion height, the support shafts 3 and 4 are pushed forward by the air cylinder 12 of FIG. 1, and the seat grip mechanisms 1 and 2 and the guide member 15 are pushed forward. Let go forward. FIG. 4 shows the state of the sheet gripper in this forward state. As shown in the figure, the upper and lower holding pieces 18 and 19 constituting the sheet gripper are relatively wide open at a predetermined inclination angle. To move forward. And
At least the distal end of the lower holding piece 19 protrudes into the rear part of the container group 28, and the tapered portion gradually pushes back the container to form a grip margin. At that time, as described above, FIG.
Since the guide member 15 is also in the forward state, the rear position of the group of containers 28 is regulated by the front surface of the guide member 15. Thereafter, as shown in FIG. 5, the intermediate sheet 14 is held by closing the gap between the upper and lower holding pieces 18 and 19. In this case, since the gripping margin is formed in the above-described forward movement, it is possible to prevent trouble such as falling down when rotating the holding pieces 18 and 19 in the horizontal direction. When the rear portion of the intermediate sheet 14 is sandwiched by the upper and lower sandwiching pieces 18 and 19, the container 28 is pushed forward by a known pushing mechanism (not shown) and transferred onto the discharge conveyor.
Thereafter, the holding pieces 18 and 19 are returned to the expanded state in which the holding pieces 18 and 19 are inclined at a predetermined angle, the air cylinder 12 in FIG. 1 is driven to return to the standby state, and the intermediate sheet 14 is removed to load the uppermost container 28. Finish the lowering. Next, the next stage container 28 is raised to the extrusion height by a lift mechanism (not shown), and the upper and lower holding pieces 1 are again moved.
The seat grip mechanisms 1 and 2 are advanced by the air cylinder 12 while the airbags 8 and 19 are in the expanded state in which the airbags 8 and 19 are inclined at a predetermined angle, and the above-described unloading work is sequentially performed on each intermediate stage. In the operation of unloading the intermediate container 28, the container 28 on the intermediate sheet 14 is
As a result, the gripping margin has already been formed, so that it is easier to avoid tipping over when the upper holding piece 18 rotates. As described above, when the unloading operation for each intermediate stage is completed and the container 28 at the final stage is raised to the extrusion height, the state is detected by the detecting means (not shown). Then, when the ascent state of the last stage is detected,
The air cylinder 25 is further moved by one based on the detection result.
Driving in the stepping-in direction causes the lower holding piece 19 to retreat to the hanging state or another rearward retreat angle as shown in FIG. Thereafter, the state, that is, the upper holding piece 1
8 is tilted to a predetermined tilt angle, and is advanced by the air cylinder 12 of FIG. 1 in a state in which the lower holding piece 19 is suspended or retracted to another rearward retreat angle. FIG. 6 shows the forward movement state. In this forward movement, since the lower holding piece 19 is in the retracted state, it does not come into contact with the pallet 27 to hinder the movement. Thereafter, only the upper holding piece 18 is rotated in the horizontal direction. FIG. 7 shows the state.
As shown in the figure, the final sheet 29 interposed between the container 28 at the final stage and the pallet 27 is sandwiched between the pallet 27 and the upper clamping piece 18. In this case, since the container 28 on the final sheet 29 has already been formed with a gripping margin by the lower holding piece 19, it is easier to avoid overturning due to the turning operation of the upper holding piece 18. When the final sheet 29 is held by the sandwiching between the upper sandwiching piece 18 and the pallet 27 in this manner, the container 28 is pushed out onto the discharge conveyor by an extrusion mechanism (not shown), and then the sandwiching is performed. By unloading the pieces 18 and 19 and returning to the standby state, the unloading work of all stages is completed. In this final state, the lower holding piece 19 may be returned to the inclined state by the air cylinder 25. As described above, according to the present invention, the state of the lower holding piece in the forward operation is configured to be selectively used in the inclined state or the retracted state according to the state of the unloading stage, and the final sheet is held satisfactorily. In addition, in the unloading work of the uppermost stage and the middle stage, the gripping margin is formed by the forward movement of the lower holding piece in the inclined state, so that overturning at the time of holding the intermediate sheet can be avoided. There is miso. Needless to say, the design of the specific shape of the upper and lower holding pieces, the structure for rotation, and the like can be appropriately changed. According to the present invention, a predetermined gripping margin is secured at the rear portion of the intermediate sheet by advancing the holding piece constituting the sheet gripper in an inclined state. At the same time, it is possible to prevent trouble such as overturning of the container when holding the intermediate sheet in the middle stage, and in the unloading work of the final stage, the lower holding piece is retracted to the hanging state or another backward evacuation angle. Since it is configured to advance in the state, it is possible to hold the final sheet by the upper holding piece and the pallet without hindrance, and it is possible to smoothly hold the sheet during the unloading work from the top stage to the last stage it can.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a main part of an embodiment of the present invention. FIG. 2 is a plan view showing a seat grip mechanism of the embodiment. FIG. 3 is an elevational view showing the seat grip mechanism. FIG. 4 is an operation explanatory view showing a forward movement state in the embodiment. FIG. 5 is an operation explanatory view showing a sandwiching state in the embodiment. FIG. 6 is an operation explanatory view showing a forward movement state in the embodiment. FIG. 7 is an operation explanatory view showing a sandwiching state in the embodiment. [Description of Signs] 1, 2 ... Seat grip mechanism, 3-6 ... Support shaft, 12 ... Air cylinder, 14 ... Intermediate seat, 15 ... Guide member, 1
8, 19: clamping piece, 22: rotating shaft, 25: air cylinder, 27: pallet, 29: final sheet

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-189930 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B65G 59/00-59/12

Claims (1)

(57) [Claims 1] An extruding mechanism for sequentially extruding containers stacked in a plurality of stages on a pallet via an intermediate sheet onto a discharge conveyor from an uppermost stage; In a sheet holding device of a pallet unloading device provided with a sheet gripper comprising upper and lower holding pieces for holding a rear portion of the intermediate sheet when extruding, the lower holding pieces are unloaded at an uppermost stage and a middle stage. In the work, the sheet gripper is configured to advance in a predetermined inclined state when pushed forward and to push the leading end portion between the containers, and in the unloading work of the final stage, to advance forward in a state of being drooped or retracted backward. A sheet holding device for a pallet unloader, wherein the sheet is held between the upper holding piece and the pallet.