JPS591521B2 - A gripping tool that grips workpieces or products that have shaft diameters that differ along the length of the shaft. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gripping tool for gripping workpieces or products having different shaft diameters in the long plane of the shaft, corresponding to the respective shaft diameters.

The present invention particularly relates to a gripping tool used when gripping and processing a workpiece or product having different shaft diameters in the long axis, or when moving a gripped object from a predetermined position to another position. It is related to.

Conventionally, when gripping this type of workpiece, etc., consideration has been given to the gripping margin and the stability of the gripping force, and depending on the shape of the workpiece, etc., the number of setups and processing steps may be increased.

Further, in general, when in a gripping state, only one part of the shaft diameter having a different diameter is gripped, so if stronger and more stable gripping ability is required, a guide may be provided.

Furthermore, when forming a gripping portion corresponding to the shaft diameter, the gripping accuracy has a great influence on the gripping effect.

An object of the present invention is to provide a gripping tool which eliminates these drawbacks, maintains stable and strong gripping ability even when gripping shaft diameters are different, and minimizes setup time.

Hereinafter, the configuration of the present invention will be explained based on practical drawings.

1 is a gripper main body (hereinafter referred to as the main body), which has a wide range of uses as a gripping member for products of chucks and loading devices installed on the main axis of machine tools.

Inside the main body 1, an operating sleeve 2 is provided which has an inner diameter tapered surface 2at and is movable forward and backward in the axial direction of the main body 1.

Reference numeral 3 denotes gripping pieces that hold It between mutually adjacent and opposing positions in the axial direction in the main body 1, are equally divided in the same direction as the radius of the operating sleeve 2, and are movable in the radial direction of the operating sleeve 2. Outer diameter tapered surfaces 3a provided at equal angles in the axial direction of the opposing gripping pieces 3 face the inner diameter tapered surface 2a of the operating sleeve 2.

The gripping pieces 3 are held within the radius of the operating sleeve 2 via springs 4 interposed between the gripping pieces 3 in the radial direction.

Reference numeral 5 denotes a rotating member that is in contact with the inner diameter tapered surface 2a of the operation sleeve 2 and the outer diameter tapered surface 3a of the gripping piece 3, and in the embodiment of the present invention, a ball is used. The tangent on the radial tapered surface 3a changes, and due to the relative axial movement of the operating sleeve 2, the ball 5 moves onto the outer diameter tapered surface 3a of the free gripping piece 3, moving the gripping piece 3 in the radial center direction of the operating sleeve 2. to press.

6 is a workpiece or product.

Next, we will discuss its effects.

FIG. 1 is an implementation diagram showing the gripping of workpieces having the same shaft diameter. First, explanation will be given based on this diagram.

The ball 5 in contact with the inner diameter tapered surface 2a of the operating sleeve 2 is in contact with the inner diameter tapered surface 2a of the mutually opposing gripping pieces 3 in the axial direction with an equal force acting on the tangent line, and as the operating sleeve 2 moves forward, The ball 5 is moved toward the radial center of the operating sleeve 2 while maintaining the previous force relationship under the action of the inner diameter tapered surface 2a of the operating sleeve 2.

At this time, the outer diameter tapered surface 3a of the gripping piece 3 in contact with the ball 5 is pushed by the ball 5, and the ball 5 is held on the tangent line that contacts the outer diameter tapered surface 3a of each gripping piece 3, and the gripping piece 3 moves to the radial center. Grip the workpiece.

Next, the operation when gripping shafts having different diameters as shown in FIG. 2 will be explained.

The initial action is the same as above, but when one of the gripping pieces 3 comes into contact with the shaft having a large diameter, the ball 5 moves onto the outer diameter tapered surface 3a of the gripping piece 3 while the operating sleeve 2 continues to move forward. The grip piece 3 moves away from the tangential line held on the tangential line and moves onto the outer diameter tapered surface 3a of the free gripping piece 3, changing the tangent line between the gripping pieces 3.

Outer diameter tapered surface 3 of grip piece 3 where ball 5 is in a free position
a by moving the operating sleeve 2 forward and pushing the outer diameter tapered surface 3a, the gripping piece 3 is moved to the operating sleeve 2.
It moves toward the center of the radius and grips the shaft portion with a small shaft diameter.

As described above, even if the shafts have different diameters on the same axis, all the shaft parts are gripped by the gripping pieces by mutual movement of the gripping pieces.

Therefore, the gripping force is stable and even stronger gripping is expected.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the gripping tool of the present invention, in which workpieces or products having the same shaft diameter are gripped, and Figs. 2A and 20 are cross-sectional views showing gripping tools having different shaft diameters. A cross-sectional view showing the case where an object is grasped, Figure 3 is along the arrow line A in Figure 1.
-A sectional view.

Claims (1)

[Claims] 1 An operation sleeve having an inner diameter tapered surface that can move forward and backward in the axial direction within the gripper body is provided, and the operation sleeves are arranged adjacent to each other in the axial direction within the gripper body to maintain a relative positional relationship, and in the same direction as the radius of the operation sleeve. The operation sleeve is held movably in the radial direction via a spring interposed between the grip pieces divided into equal parts, and the opposing grip pieces are provided facing each other in the axial direction at equal angles. A rotary member whose outer diameter tapered surface faces the inner diameter taper surface of the operating sleeve, and which contacts the inner diameter tapered surface of the operating sleeve and the outer diameter tapered surface of each grip piece, rotates the outer diameter of each grip piece by relative movement in the axial direction of the operation sleeve. A gripping tool for gripping workpieces or products having different shaft diameters along the length of the shaft, characterized by gripping shafts of different diameters by changing the tangent line in contact with a radially tapered surface.