JPH07110722B2 - Sheet separation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention enables even a metal sheet having no magnetism such as an aluminum sheet to be sucked up one by one from a laminate, that is, a stack. Sheet separation method for performing.

(Prior Art) Conventionally, a vehicle body of an automobile is made of steel sheet, and a sheet material conveying system to a press forming machine for making a vehicle body is known, for example, as shown in FIG. In that system, a conveyor device (1) equipped with a pickup device as a stacker for sucking and lifting sheet materials one by one from a stack is installed, and a crane saver (2) and a crane saver (2) are installed so as to pass under the conveyor device (1). It is equipped with a so-called conveyor and a crane saver (2) as a pre-stage of destacking.
There is a stack loading stage (3). At this position, the stack on the dedicated skit is placed on the crane saver (2) together with the skit by the forklift and moved to the position of the transport device (1). There is also a washer (4), an intermediate conveyor (5) and a centering device (6) in this system. (7) is an auto fork,
(8) is a skit take-out stage.

A stack lifter is provided below the transfer device (1), and when the stack placed on the skit (9) reaches below the transfer device (1), the stack lifter rises, and the upper surface of the stack is always at the suction level. Is gradually rising. Since the steel sheet can be separated by magnetism, magnetic floaters are installed on both sides of the stack.When the stack arrives, the magnetic floater advances and stops close to the side surface at the top of the stack, floating the sheet material. And separate from each other. The uppermost sheet material thus separated is sucked up by the suction cup of the pickup device and delivered to the lower surface of the belt conveyor with a built-in magnet for the next step, for example, the washing machine (4).
Move to. After passing through the washing machine, the sheet material is sent to the intermediate conveyor (5), and then the centering device (6) performs front-rear, left-right positioning, and is supplied to the molding machine by an appropriate loader.

(Problems to be Solved by the Invention) As described above, in the prior art, the sheet members on the upper part of the stack are separated from each other by the magnetic floater, so that the steel sheet can be separated appropriately. However, it cannot be used to separate non-magnetic aluminum sheets. On the other hand, in recent years, there has been a great demand for improvement in motor performance and fuel efficiency, and therefore, aluminum sheets, which are lightweight materials, are about to be used for body panels of automobiles. However, the conventional magnetic floaters cannot separate the aluminum sheets from each other, and the separation method is a bottleneck in forming the aluminum sheets. It goes without saying that the separation method must be completely separable and highly reliable, but the structure can be simplified and shared with the steel sheet, and sheets of various shapes other than rectangular can be used. It is necessary to meet requirements such as being able to respond.

An object of the present invention is to solve the above problems, and therefore, it is possible to separate aluminum sheets with a high reliability and a relatively simple structure, and it is possible to cope with sheets of various shapes. It is to provide a sheet separating method.

(Means for Solving the Problems) A feature of the sheet separating method according to the present invention is that when cutting a continuous sheet material into predetermined dimensions, unevenness is provided at appropriate intervals along one or both cutting edges of the sheet material, Therefore, the stack is constituted by the sheet material provided with such unevenness, and air is blown to the upper part of the stack where the unevenness exists.

(Operation) On the uneven side of the sheet material in the stack, the unevenness causes a slight gap between the adjacent sheet materials. By blowing air into the gap, an air film is formed between the sheet materials, so that the sheet materials are prevented from adhering to each other, and the suction cups can suck and raise the sheet materials one by one from the stack.

(Example) Next, an example of the present invention will be described with reference to the drawings. This sheet separating method is, as shown in FIGS. 2 and 3, a pickup device (11) as a discutter.
A plurality of rows of suction cups (12) provided in the stack for separating the sheet material (A) from the stack (S) one by one, and separating the sheet material at the top of the stack.
As shown in FIG. 1, the step of providing the unevenness (10) on at least one edge of each sheet material (A) constituting the stack and the uneven side of each sheet material are arranged on the same side, The air nozzle (13) blows air over the upper side of the uneven side of the staff to separate it.

2 and 3 illustrate a device that can convey both non-magnetic sheet materials such as a steel sheet and an aluminum sheet, and a pickup device (11).
Is supported by a traveling device (15), and in the case of an aluminum sheet, a magnetic floater (20) and a belt conveyor (14) with a built-in magnet.
The sheet plate (A) adsorbed by the suction cup (12) is stopped at a position lower than the lower surface of the belt conveyor (14), and in that state by the traveling device (15) as shown in FIG. It is moved to the next process such as the washing machine (4), then is moved by being sandwiched between the roller (17) and the vertically movable pinch roller (16), at which time the sheet material (A) is at the middle or rear position. Is supported by a receiving device (18). In the case of a steel sheet, the magnetic floater (20) floats the sheet material as in the conventional case, and the attracted and raised sheet material is attracted and conveyed by the lower surface of the magnet built-in belt conveyor (14).

The step of forming irregularities on one edge of the sheet material is performed simultaneously with the cutting of the sheet material. FIG. 4 shows a blanking line including a press for forming a stack of sheet materials having a predetermined size from a coiled sheet, in which the coil material (C) is fed from the uncoiler (21) and the cleaning roll (22). , A feed roll (23), a photoelectric tube device (24), a leveling roll (25), and a blanking press (26) consisting of a blanking die and a shearing blade. Material (A)
Are stacked on a piler (27).

The unevenness (10) provided on one edge of the sheet material is formed with an appropriate height and interval, and in one example, the thickness of the sheet material is 1 mm.
In the case of, the height of the convex part is 0.2 mm, and the pitch (spacing) is 150 to 200 m
m, and the irregularities are preferably spherical. Also,
The unevenness (10) is provided near the cutting edge, for example, along a position 5 mm from the edge.

FIG. 5 and FIG. 6 show an example of a blanking die (30) which forms such unevenness at the same time as cutting, and as shown in the drawing, the upper shoe (31) and the lower shoe (3) are shown.
2), to which the shearing blades (33) or (34) are fixed, between which the cutting of the sheet takes place. A stripper (36) is fixed to the upper shoe (31) via a cushion rubber (35) to hold down one side of the cut edge of the seat. (37) is a sheet feeding roller. And, as clearly shown in FIG.
Concavo-convex punches (38) are fixed to the stripper (36) near the shearing blade (33) at appropriate intervals, and the punching blades (34) corresponding to the punches (38) receive the punches. A concave groove (39) is formed.

Therefore, in this blanking die, the press descends, and when the sheet material is cut between the pair of shear blades (33) and (34) at the descending end, at the same time, the stripper (36)
And the lower shoe shearing blade (34) sandwiches the edge of the sheet material and each punch (38) descends into the corresponding concave groove (39) to form an unevenness (10) in the sheet material portion therebetween. . Pile (27) for the cut sheet material by roller (37)
The sheet material having a series of concavities and convexities (10) inserted at the end is sent out by a predetermined size and similarly cut. Therefore, in this case, the sheet is inserted into the pillar (27) from the edge with the unevenness (10) and stacked so that the uneven sides of the sheet materials are located on the same side.

The nozzle (13) for blowing air to the side of the stack having the irregularities (10) is composed of a series of nozzles provided at appropriate intervals as shown in FIG. 8 and forms an air film between the sheet materials. If desired, as shown in FIG. 9, unevenness (10) may be provided on both sides of the sheet material, in which case the punch (38) and the groove (39) are provided on both sides of the blanking die (30). It goes without saying that it will be done.

When a sheet material having unevenness (10) on at least one side is overlapped, a slight misalignment occurs between the upper and lower sheet materials, and a slight burr is generated by cutting, so that the unevenness (10) of the adjacent sheet material is They are never placed in exactly the same position. Therefore, as shown in FIG. 1, due to the unevenness, a slight gap is created between the sheet materials, and air is blown to the side where the unevenness exists, so that the air is inserted between the sheet materials through the gap, An air film is created, which separates the sheet materials from each other.

Since the peripheral edge portion of the sheet material is cut and removed at the time of molding, there is no problem even if unevenness exists along one or both edges of the sheet material.

(Effects of the Invention) Therefore, according to the present invention, air is blown into the gap created by the unevenness provided at the edge portion of the sheet material to form an air film between the sheet materials, so that the sheet materials of the stack are non-magnetic. Even if it is a material, the sheet material can be reliably separated from the stack one by one. Moreover, since it can be carried out with an extremely simple structure, it can be suitably used for a common type conveyance system of steel sheet and aluminum sheet. Further, even if the sheet material has an irregular shape other than the rectangular shape, for example, the sheet material has a triangular shape or a trapezoidal shape as shown by an imaginary line in FIG. 8, the sheet materials can be appropriately separated. In contrast,
As a common type, as shown in Fig. 10, the magnetic floaters (20) on both sides bend the upper sheet material, or
As shown in Fig. 11, a magnetic floater (20) may be used to incline the upper part of the stack, a rotating brush (30) may be provided on the opposite side of the stack, and air may be blown. The wood has drawbacks that cannot be used. However, in order to reduce scrap, an amorphous sheet material is often used, and it is a fatal drawback that it cannot correspond to an amorphous shape, but the separation method according to the present invention is suitable for such an amorphous shape. There are corresponding advantages.

[Brief description of drawings]

FIG. 1 is a side view showing a state where sheets are separated by a sheet separating method according to the present invention, FIG. 2 is an elevation view of an example of a sheet conveying apparatus, FIG. 3 is a plan view of the sheet conveying apparatus, and FIG. FIG. 5 is a schematic view showing a blanking line for forming a stack of sheet materials, FIG. 5 is a sectional view of a main part of a blanking die used in the line, and FIG. 6 is an enlarged view of part B of FIG.
FIG. 8 is a schematic view of a transport system including a sheet transport device.
FIG. 9 is a plan view showing an embodiment of the separation method of the present invention, FIG. 9 is a plan view showing another embodiment of the present invention, and FIGS. 10 and 11 are vertical views showing other possible separation methods. It is a side view. In the figure, 10: unevenness of the sheet material, 11: pickup device, 12:
Sucker, 13: Air nozzle

Claims (1)

[Claims] 1. A method for separating sheet materials from a stack of stacked sheet materials so that the sheet materials can be sucked and raised one by one, and at least the sheet material is cut when cutting continuous sheet materials to a predetermined size. Unevenness is provided at appropriate intervals along one cutting edge, so that the stack is made of sheet material provided with such unevenness, and air is blown to the side of the stack where the unevenness exists. Sheet separation method.