JPH1077131A - Sucker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a well-known sucker, constitute the sucker of a small number of constitutive parts, easily assemble it, and thrust away second sheet- fed paper when two-ply sheet-fed paper is gripped. SOLUTION: A suction nozzle 6 is arranged at the bottom formed of an end surface of a sucker main body 4 of an inner chamber 2 of bellows 1, and a suction opening is opened in the inner chamber 2 of the bellows 1 toward the outside, and the uppermost sheet-fed paper can be gripped every time by the free end 9 of the bellows 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a sucker, in particular a separating sucker, for gripping and lifting the uppermost sheet of a sheet pile, in particular having an elastic bellows bellows. By applying a negative pressure to the inner chamber of the bellows, the bellows can be contracted from a relaxed state to a shortened state, and can be fixed to the sucker body at the upper end, and an end face of the sucker body facing the bellows bellows. The side forms the bottom of the inner chamber of the bellows bellows, and further has a suction nozzle that can be loaded with a negative pressure, the suction nozzle communicating with the suction surface of the suction nozzle and opening outward at the suction surface. It relates to a type having an opening.

[0002]

2. Description of the Related Art In this type of sucker, it is known that a suction nozzle is formed as an insert component and is fixed to a lower end of a bellows bellows by a snap connection.

[0003] Such a configuration not only requires a large number of components, but also requires assembly costs. Furthermore, in this case, there is a danger that the sheets will be grasped in a stack.

[0004]

SUMMARY OF THE INVENTION The object of the invention is to improve a sucker of the type mentioned at the outset, consisting of a small number of components, which is easy to assemble, and which can be used for the two-ply gripping of sheets. The purpose is to provide a sucker from which two sheets are pushed apart.

[0005]

According to the present invention, there is provided a bellows bellows, wherein the suction nozzle is disposed at a bottom formed by an end face of the sucker body, and wherein the suction opening is provided. Are open outwardly into the interior of the bellows bellows, each time the topmost sheet can be gripped by the free end of the bellows bellows.

[0006] The curving of the grasped sheet into the interior chamber results in the relative movement of the two grasped sheets when the sheets are grasped in a stack, and consequently, Release the grabbed second sheet.

Furthermore, the free end of the bellows bellows can be oriented in various directions towards the surface of the sheet pile, which allows the sucker to be oriented in a direction different from the direction perpendicular to the sheet surface. To

[0008] Pushing the gripped second sheet away is more effective if the suction surface of the suction nozzle has a shape different from a plane. Because in this case, the suction surface has a shape different from the flat surface, so that when the sheet lifted by the bellows bellows comes into contact with the suction surface, the sheet gripped in two sheets is further increased. This is because they can be relatively moved. The secure release of the second sheet or the lack of receipt of the second sheet enables very high operating speeds of the feeder of which the sucker is a part.

Differentiating the suction surface from the plane can be achieved by various ridges or depressions in the suction surface.

What is particularly simple to produce is that the suction surface is designed in a convex or convex manner. In this case, the sheet that is brought into contact with the suction surface is bent into a curve or a convex, releasing the second sheet gripped together. This is particularly advantageous for thick sheets.

In order to obtain a good suction surface according to the type of sheet, the suction nozzle can be an independent component that can be fixed to the end face of the sucker body. This component is interchangeable, which makes it possible to use an optimal suction nozzle in each case.

For replacement, the suction nozzle advantageously has, on the side opposite to the suction surface, a projecting addition which can be inserted into a corresponding cutout in the end face of the sucker body. It is.

In order to easily and quickly replace the suction nozzle, the suction nozzle can be locked in a notch of the sucker body at an additional portion.

For this purpose, in a simple construction, the additional part is cylindrical and has at its free end one or more locking additional parts projecting in the radial direction. Can be locked in the notch of the sucker body.

In order to ensure that the respective topmost sheet of the sheet pile is gripped, the last section below the bellows bellows forms a flexible ring lip and extends from the inside diameter of the bellows bellows to the outside diameter. It is advantageous if it extends toward it. In this case, the ring lip can snuggle up to the sheet.

[0016] An easy-to-assemble configuration with a small number of components is that the sucker body has a cylindrical fixing portion, and a radial ring groove circulating in the circumferential direction is formed on the cylindrical peripheral surface of the fixing portion. This is achieved by the fact that the upper end of the bellows bellows snaps into the ring groove at the corresponding circulating edge.

If the suction opening is evenly distributed on the suction surface of the suction nozzle and is open to the outside, the gripped sheet is brought into almost complete contact with the suction surface and is deformed corresponding to its surface shape. Let me do. This helps to ensure that the second sheet gripped together is released.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described based on the illustrated embodiment.

The sucker shown in FIG. 1 has a sucker body 4 which can be immovably or movably arranged.
Has a fixing flange 19 and a cylindrical fixing portion 16 extending downward from the fixing flange 19.

The cylindrical fixed part 16 has a lower free end,
It has a ring groove 17 extending in the circumferential direction on the cylindrical peripheral surface.

The fixed part 16 has a coaxial suction hole 20. The suction hole 20 can be connected to a negative pressure source and opens outward at the lower end of the fixed part 16 via the suction nozzle 6.

The bellows bellows 1 is engaged in the ring groove 17 of the fixed portion 16 in the small diameter region of the uppermost bellows portion forming an annular edge 18 at the upper end 3 of the bellows bellows 1. The bellows bellows 1 is made of an elastic plastic and is shown in a relaxed state.

At the free end of the fixed part 16, the suction hole 20 ends with a bottom 21 having a notch 11 having a diameter smaller than the diameter of the suction hole 20.

The suction nozzle 6 is inserted into the notch 11 at a corresponding cylindrical additional portion 10. The circumferentially extending ring attachment 10 at the free end of the attachment 10 engages behind the bottom 21. In this case, the suction hole 20 forms a ring groove 13 for engaging the additional portion 12 of the ring.

The suction nozzle 6 has a larger diameter than the notch 11 in a region opposite to the fixed portion 16, and is in contact with the outer end surface 5 of the fixed portion 16.

The suction nozzle 6 has a convex surface at a portion where the bellows bellows 1 of the sucker protrudes into the inner chamber 2. This surface is a suction surface 8 of the suction nozzle 6.
Is formed.

The suction nozzle 6 has three suction openings 7 penetrating in the axial direction. These suction openings 7 lead from the suction holes 20 to the inner chamber 2 of the bellows bellows 1 and open to the inner chamber 2 at the suction surface 8. The three suction openings 7 are uniformly distributed in concentric partial circles and open to the inner chamber 2.

The last section 14 of the free end 9 of the bellows bellows 1 is designed as a flexible ring lip 15. The uppermost sheet of the sheet pile is attracted to the ring lip 15 by the load due to the negative pressure between the suction hole 20 and the inner chamber 2. This gives bellow bellows 1
Is closed, the bellows bellows 1 is contracted by the subsequent exhaust, the gripped sheet is separated from the sheet pile and lifted until it touches the suction surface 8 of the suction nozzle 6.

The sheet thus lifted is separated from the sucker in the horizontal direction via the member to be continuously conveyed, and is conveyed to the front. As soon as the sheet has been separated from the sucker and the negative pressure load has ended, the sucker is returned to the illustrated reference position again by the appropriate elasticity of the bellows bellows 1.

[Brief description of the drawings]

FIG. 1 is a side view partially showing a sucker.

FIG. 2 is a side view in which a suction nozzle of the sucker of FIG. 1 is partially sectioned;

FIG. 3 is a plan view of a suction surface of the suction nozzle of FIG. 2;

[Explanation of symbols]

1 bellow bellows, 2 inner chamber, 3 upper end, 4
Sucker body, 5 end faces, 6 suction nozzles,
7 suction opening, 8 suction surface, 9 free end, 1
0 additional part, 11 notch, 12 ring additional part,
13 ring groove, 14 section, 15 ring lip, 16 fixing part, 17 ring groove, 18 edge, 19 fixing flange, 20 suction hole, 21
bottom

Claims (13)

[Claims] 1. A sucker, in particular a separating sucker, for gripping and lifting the uppermost sheet of a sheet pile, each having an elastic bellows bellows, the bellows bellows defining the inner chamber. By applying a negative pressure, it can be contracted from a relaxed state to a shortened state and can be fixed to the sucker main body at the upper end, and the end face side of the sucker main body facing the bellows bellows is inside the bellows bellows. Forming a bottom of the chamber, further comprising a suction nozzle loadable with a negative pressure, the suction nozzle having a suction opening communicating with a suction surface of the suction nozzle and opening outward at the suction surface. The suction nozzle (6) at the bottom of the inner chamber (2) of the bellows bellows (1) formed by the end face of the sucker body (4).
And the suction opening (7) opens outwardly into the interior chamber (2) of the bellows bellows (1), each time the top sheet is the bellows bellows. A sucker characterized in that it can be gripped by the free end (9) of (1). 2. The sucker according to claim 1, wherein the suction surface of the suction nozzle has a shape different from a plane. 3. The sucker according to claim 2, wherein the suction surface (8) is configured in a concavity. 4. The sucker according to claim 2, wherein the suction surface (8) is constructed in a convex manner. 5. The sucker according to claim 1, wherein the suction nozzle is an independent component that can be fixed to an end face of the sucker body. 6. The suction nozzle (6) has an additional portion (10) protruding on a side opposite to the suction surface (8), and the additional portion (10) is an end surface of the sucker body (4). 6. The sucker according to claim 5, wherein the sucker is insertable into a corresponding notch (11) in (5). 7. The sucker according to claim 6, wherein the suction nozzle (6) is lockable in a notch (11) of the sucker body (4) at its addition part (10). 8. The additional portion (10) is formed in a cylindrical shape and has one or more locking additional portions projecting radially at a free end thereof, and the locking additional portion is connected to the sucker body (4). 8. The sucker according to claim 7, wherein the sucker is lockable in a corresponding locking notch in the notch (11). 9. The sucker according to claim 8, wherein the locking attachment is a circumferentially extending ring attachment. 10. The sucker according to claim 8, wherein the locking notch is a circumferentially extending ring groove (13). 11. The bellows bellows (1) has a lower last section (14) forming a flexible ring lip (15) extending from the inner diameter to the outer diameter of the bellows bellows (1). The sucker according to any one of 1 to 10. 12. The sucker body (4) has a cylindrical fixing portion (16), and a circumferentially extending ring groove (17) is formed on the cylindrical peripheral surface of the fixing portion (16). 12. The sucker according to claim 1, wherein the upper end of the bellows bellows (1) can be snap-fitted in the ring groove (17) with a corresponding annular edge (18). 13. The suction opening (7) according to claim 1, wherein the suction opening (7) is uniformly distributed on the suction surface (8) of the suction nozzle (6) and opens outwardly. Sucker.