JPH0539135A - Sheet material take-up device - Google Patents

Abstract

PURPOSE:To easily separate many stacked sheet materials from each other by providing two pressing arms having passing portion on the substantially same plane as an attraction hole surface, and a means for moving a frame vertically. CONSTITUTION:An attraction hole 11 sucks the uppermost work 35, and when it is further lowered, the right end of an attraction head 10 is slid over the work 35 and moved a little while a take-up device 100 is moved from a tilting position to a horizontal position. By the movement, the attracted work 35 is positioned in a position for making contact with a stock member. By the operation, even if a little clearance is provided between the outer periphery of the work 35 and the stock member, the attraction head 10 and the work 35 can be always kept in fixed positional relation without any dispersion. When a holder 1 is moved in the direction of an arrow A and the take-up device 100 is raised, the device 100 is raised while the work is attracted thereto. Thus, the take-up operation for the work 35 can be completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for picking up a sheet-like object which is formed by separating a plurality of vertically stacked sheet-like objects one by one from the top.

[0002]

2. Description of the Related Art In a conventional apparatus for stacking a large number of sheet-like objects such as plastic films or paper in the vertical direction and picking up the uppermost one by one, a pick-up unit having vacuum suction means. There is widely adopted a method of bringing the sheet into contact with the surface of the sheet-like object, adsorbing only the uppermost sheet by the adsorbing means, and separating and picking up from the sheet below.

[0003]

The problem with such a pickup device is to reliably separate and pick up the stacked sheet-like objects one by one. For example, when applying to a sheet-like material that does not breathe, such as a plastic film,
Since the suction force of the suction means acts only on the uppermost sheet, the sheets can be separated relatively easily. However, in the case of picking up a work such as a sheet of air-permeable sheet such as paper or cloth, for example, a ring of a slipping material for a clutch, the suction force is in addition to the uppermost one or two sheets below it. It also makes it difficult to separate and pick up one by one.

It is also possible to weaken the suction force of the suction means so that only the uppermost one sheet is sucked, but in this method, burrs and the like formed at the top and bottom of the stacked sheet-like materials are cut. There is a possibility that even the uppermost one cannot be picked up, for example, when it is attached due to.

It is an object of the present invention to provide a sheet-like object picking-up device for picking up a ring-shaped sheet-like object made of an air-permeable material such as paper.

[0006]

According to the sheet-like material picking-up device of the present invention, a ring-shaped sheet-like work in which a plurality of sheets are stacked in the vertical direction is sucked at the uppermost part thereof on a part thereof. Equipped with a suction head having suction holes,
The suction head is rotatably supported upward on the frame by a rotation shaft having a predetermined distance from the suction hole in the center direction of the work and parallel to the tangential direction of the outer periphery of the work suction portion, and is rotated by the drive means. The frame that provides a dynamic operation is provided with a holding arm that is substantially on the same plane as the suction surface in the vicinity of both sides of the suction hole, and the frame is configured to move in the vertical direction by the moving means.

[0007]

After a part of the ring-shaped and sheet-shaped work is sucked by the suction holes of the suction head, the suction head is turned upward with respect to the ring. It is held by the holding arms provided one by one.

The suction force acting on the uppermost sheet-like material is larger than the bending resistance when the sheet-like material is bent by the rotation of the suction head while being pressed by the holding arm and is the second from the topmost. If the suction force acting on the sheet-shaped material is set to be smaller than the bending resistance of the sheet-shaped material, only the uppermost sheet-shaped material is sucked by the suction head and bent by the rotation of the suction bed. However, the sheet-like material of the second or lower sheet does not bend because the attracting force it receives is significantly smaller than that of the uppermost sheet, and as a result, the two are separated.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view of a sheet material pick-up device 100 according to an embodiment of the present invention. In the figure, the holder 1 is connected to a mechanism portion (not shown) for moving the pick-up device 100 up and down, and a slot 3 is provided in the lower portion thereof. Screw 4 attached to post 2 in slot 3
The end portion of is inserted, and the holder 1 and the post 2 are coupled so as to be movable in the vertical direction by the length of the long hole 3.

The outer dimension of the holder 1 is made considerably smaller than the inner dimension of the post 2 so that a clearance is produced. In addition, in the side view of FIG.
The weight of 100 on the right side of the figure is heavier than the weight of the left side of the figure centering on the post 2. Therefore holder 1
When the pick-up device 100 is lifted by moving the above (vertical direction indicated by the arrow) in the figure, the right part of the pick-up device 100 is lowered by the clearance between the holder 1 and the post 2 and is inclined by an angle θ.

A long hole is formed in the frame 5 fixed to the post 2.
5A is provided, and two slide frames 6 are held by two screws 8 so as to be movable in the direction of arrow B in FIG. By this movement, the length between the post 2 and the suction head 10 is adjusted in accordance with the diameter of a ring-shaped sheet-like object (hereinafter simply referred to as a work and indicated by reference numeral 35 in FIG. 4).

A suction head 10 is rotatably supported by a shaft 13 between the two slide frames 6. Suction head
10 has a rectangular suction hole 11 on its lower surface, and a tube 12A attached to a tube connector 12 communicating with the suction hole 11
Through a vacuum generator (not shown).

The suction head 10 has a bracket 14, and is connected to a rod 16 of an air cylinder 17 via a joint 15 that is rotatably connected to the bracket 14.

It is desirable that the suction holes 11 are, for example, elongated holes having an aspect ratio of 10: 1 and the longitudinal direction thereof is aligned with the circumferential direction of the work.

The other end 17A of the air cylinder 17 is rotatably connected to an air ring bracket 24, and the air cylinder bracket 24 is fixed to a slide frame end 21 for connecting the slide frames 6 on both sides.

In FIG. 1, a pressing arm 7 is provided on each of the slide frames 6. Presser arm 7
Are arranged on both sides of the suction head 10, and the lower surface 7A thereof is substantially the same as the opening surface of the suction hole 11 when the suction head 10 is not rotated.

The distance between the suction hole 11 and the pressing arm 7 is the work piece.
A width of 35 (made of air-permeable paper and having a thickness of about 0.6 mm in this embodiment) of 2 to 3 times is suitable.

A stopper 23 is supported on the frame 5 so as to be movable in the direction of arrow D, and can be fixed at a desired position by a screw 22. The stopper 23 is for adjusting the stroke of the air cylinder 17, and thereby the rotation angle of the suction head 10 can be set to an arbitrary angle as shown in FIG.

Next, the operation will be described. FIG. 2 shows a state in which the holder 1 is lifted and the pick-up device 100 is lifted. This state is the state before the pickup device 100 starts the pickup operation.

When the operation starts, the holder 1 moves downward, and the pick-up device 100 descends onto the stacked works 35. The holder 1 has the work piece 3 whose weight is
It is configured to stop at a position applied to the upper part 5, that is, a position where the holder 1 and the post 2 do not exert a mutual force by the long hole 3. At this time, the slide frame 6 and the suction suction head 10 can be moved with a slight degree of freedom by the engagement of the screw 4 and the long hole 3, so that some variation in the stop position of the pick-up device 100 is compensated.
As shown in FIG. 4, the work 35 is horizontally stacked with its outer periphery held by three stock members 30, 31, 32 having a U-shaped plane, for example.

In FIG. 2, since the pick-up device 100 is inclined by the angle θ with the right side thereof facing down, the suction head 10 first comes into contact with the upper surface of the work 35 in the descending process of the holder 1. Then, it is controlled by a detection signal of a position detector (not shown) so that the suction hole 11 has a negative pressure (for example, -0.3 to -0.5 kg / cm ² ) immediately before the suction head contacts the upper surface of the work 35. There is.

When the suction hole 11 sucks the uppermost work 35 and further lowers as described above, the pick-up device
Between the inclined position shown in FIG. 2 and the horizontal position shown in FIG. 3, the right end of the suction head 10 moves slightly (for example, 2 to 3 mm) over the work in the direction shown by arrow B. .. By this movement, the adsorbed work 35 is indicated by the arrow B.
And is positioned at a position in contact with the stock member 31, as shown in FIG. By this operation, the work
Even if some clearance is provided between the outer periphery of 35 and the stock members 30, 31, 32 (If no clearance is provided, the stock member
(Smooth movement of the work 35 within 30.31.32 is obstructed) The suction head 10 and the work 35 can always maintain a constant positional relationship without variation.

Next, as shown in FIG. 5, when the air cylinder 17 is operated to contract to move the joint 15 in the direction of arrow C, the suction head 10 rotates so as to lift the right end. The angle of rotation is selected in the range of 15 to 25 ° according to the elasticity of the work 35. The rotation angle is adjusted by loosening the screw 22 and moving the stopper 23 in the direction of arrow D.

At this time, since the two holding arms 7 hold the work 35 in the vicinity of the suction hole 11, the work 35 is bent at the holding arm 7. In this case, only the uppermost one workpiece that receives the strongest suction force is sucked and bent. Even if the suction force acts on the second and subsequent workpieces 35, the atmospheric pressure of the vacuum generating device is set so that the suction force is sufficiently smaller than the drag force of the workpiece 35. As a result, only the uppermost one work 35 is bent and separated from the lower work 35.

Next, when the holder 1 is moved in the direction of arrow A to raise the pick-up device 100, the pick-up device 100 ascends while holding the work 35, as shown in FIG. 6, and completes picking up the work. Next, the pick-up device 100 is moved in the direction of arrow E, for example, by a moving mechanism (not shown) to position the work 35 at a predetermined position (for example, on a belt conveyor) and set the pressure of the suction holes 11 to normal pressure. Release the work 35.

The above-mentioned operation is repeated in a predetermined cycle, but it is controlled by a known lifting device (not shown) so that the position of the uppermost work 35 in the height direction is always constant. Work pieces from the first sheet onward are also picked up sequentially.

[0027]

According to the apparatus of the present invention, a part of the circumference of the air-permeable ring-shaped sheet (workpiece 35) is sucked by the suction head 10, and the vicinity of the suction portion is pressed by the pressing arm 7. The suction head 10 is rotated to lift the suction portion. At this time, by setting the suction force and the angle to a predetermined value, only the uppermost work 35 is sucked and bent, and for the lower work 35 in the uppermost work 35, the bending resistance is larger than the suction force. Therefore, adsorption does not occur, so that the uppermost work 35 is reliably separated and picked up.

[Brief description of drawings]

FIG. 1 is a perspective view of a sheet material pickup device according to an embodiment of the present invention.

FIG. 2 is a side view of the sheet material pickup device according to the present embodiment.

FIG. 3 is a diagram showing a state in which the sheet material pick-up device of the present embodiment is lowered onto a work.

FIG. 4 is a bottom view of the sheet material pickup device according to the present embodiment.

FIG. 5 is a side view showing the operation of the sheet material pick-up device of the present embodiment.

FIG. 6 is a side view showing a picked-up state of the sheet-shaped material pick-up device of the present embodiment.

[Explanation of symbols]

 1 Holder 6 Slide frame 7 Holding arm 7A Holding surface 10 Suction head 11 Suction hole 13 Axis 17 Air cylinder 35 Work W Work width

Claims (3)

[Claims] 1. A suction head having suction holes for sucking a ring-shaped sheet-like uppermost one of a plurality of vertically stacked sheets on a part of its surface, and a suction hole extending from the suction hole toward the center of the workpiece. A frame that has a predetermined distance and that supports the suction head rotatably upward by a rotation shaft that is parallel to the tangential direction of the outer circumference of the suction portion of the work. A drive means provided on the frame for giving a rotation operation to the suction head around the rotation axis; a suction hole surface near the both sides of the suction hole when the suction head is fixed to the frame and in a rest position. A sheet-like material pick-up device including: two holding arms having a holding portion that is substantially on the same plane as that of, and a moving unit that moves the frame in the vertical direction. 2. The distance between the holding portion of the holding arm and the suction hole is selected to be 2 to 3 times the ring width of the work.
The device for picking up sheets. 3. The device for picking up a sheet-like object according to claim 1, wherein the suction holes of the suction head are rectangular, and the long sides thereof are parallel to the tangential direction.