JPH0224596Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a device for positioning and holding flanged shaft parts.

(Prior art) Automatic double centering machines, in which the left and right center arms can be expanded and contracted freely so that a shaft workpiece can be held from both ends between these center pins, are usually manufactured by " As shown on pages 110 and 111 of "Automation Books (6) Automation Diagram Collection of Jig Fixtures", a configuration is adopted in which the expansion and contraction of both center arms are driven by a common cylinder. For this reason, with this type of device, it is difficult to extend and retract the left and right center arms equally, and if there is variation in the extension and retraction movements, it is impossible to accurately position and hold the shaft workpiece in the axial direction. In addition to the complicated operation of having to move the holder body back and forth and attach the shafted workpiece to a processing machine, etc., if a stopper member is provided to restrict the movement of the center arm, the type of workpiece It is necessary to replace the center pin and stopper each time, and in a transfer machine or the like, this requires a large number of man-hours for setup changes, which causes inconveniences such as a significant reduction in the operating rate of the device.

(Purpose) The present invention was developed in view of the above problem, and its purpose is to use the flange portion of shaft parts to accurately position and hold the parts in the axial direction, regardless of the type of the parts. The objective is to provide an improved device.

(Means for Achieving the Object) In other words, the present invention serves as a holding device for flanged shaft parts to achieve the above object. a pair of arm members that axially clamp the body, and a pair of arm members that are pivoted on the main body in response to a rotation urging force toward the retracted position, and that rotate to the reference position in conjunction with the movement of the arm members in the clamping direction. The present invention further includes a positioning member that comes into contact with the flange portion of the shaft component to position the shaft component in the axial direction.

(Example) The details of the present invention will be explained below based on the illustrated example.

The drawing shows one embodiment of the present invention, and reference numeral 1 in the drawing represents a holder body that is integrally attached to a mounting member 2 of a transport mechanism (not shown), and a cylinder 3 is installed horizontally in this holder body 1. Further, sliding guide holes 4, 4' for guide rods 8, 8' are bored parallel to this cylinder 3.

5 and 5' are left and right pistons disposed oppositely in the cylinder 3, and piston rods 6 and 6' integral with these piston rods protrude outward from both ends of the cylinder 3, and have center arms 7 and 7 at their tips. ′ is fixed.

These center arms 7, 7' are also connected to guide rods 8, 8' which slide in the sliding guide hole 4 at the same time, ensuring parallel expansion and contraction movements of both, and also from the holder body 1. Center pins 9, 9' are attached to opposing ends of these downwardly protruding tips.

Reference numeral 11 denotes an axial positioning block for the workpiece W, which is a characteristic feature of the present invention. It is rotatably supported, and when the left and right center arms 7, 7' move in the direction of pinching and retracting to clamp the workpiece w, they rotate counterclockwise in the figure and the flange of the workpiece w. It is configured to abut portion wf and position it in the axial direction.

To explain this in more detail, this positioning block 11 is integrally formed with an arm 14 that projects and comes into contact with the flange portion wf of the workpiece w, and the base portion thereof has an arm 14 that extends inwardly from one center arm 7. A recess 15 with a protrusion 16 is formed to receive the protruding operating rod 10, and when the center arm 7 is in the expanded position, the operating rod 1
The protrusion 16 is brought into contact with the stepped guide surface 10a formed with a notch at the tip of the shaft, and the positioning block 11 is rotated in the direction (clockwise in the figure) to retreat from the flange portion wf of the shaft workpiece w (see FIG. 2). a), also
When the center arm 7 moves in the direction of holding the work w, the protrusion 16 rides on the lower peripheral surface of the operating rod 10, and the positioning block 11
The arm 14 is rotated counterclockwise in the figure to position the tip of the arm 14 at the positioning reference position (FIG. 2b).

In the device configured as described above, when the left and right center arms 7, 7' are open, the operating rod 10 attached to one of the center arms 7 is at its tip, as shown in FIG. 2a. A stepped guide surface 10a formed with a notch is retracted to a position where it comes into contact with a protrusion 16 of the positioning block 11. Therefore, the positioning block 11 imparted with dextrorotation by the spring 12 is in the retracted position, that is, rotated clockwise in the figure, with the protrusion 16 depressed into the stepped guide surface 10a.

Next, from this state, move the holder main body 1 to the base of the shaft work w, and then move the left and right pistons 5,
Pressure oil flows into the back of the center arm 7,
7' inward. As a result, the center arms 7 and 7', which have moved inwardly,
The shaft work w is held in the axial direction by the center pins 9, 9' at the tips (FIG. 2b).

On the other hand, as a result of this movement, the operating rod 10 fixed to one side of the center arm 7 penetrates into the recess 15 of the positioning block 11, pushes up the protrusion 16 from the stepped guide surface 10a onto the lower peripheral surface, and moves the positioning block 11. is rotated counterclockwise in the figure against the spring 12 to position the tip of the arm 14 to the reference position. Since the positioning block 11 once mounted on the peripheral surface of the operating rod 10 is held in that position, the center arm 7 then moves further inward and presses the end of the shaft work w with the center pin 9. For example, the flange part wf of the shaft workpiece w
is positioned in the axial direction with the tip of the arm 14 as a reference.

(Effects) As explained above, according to the present invention, a positioning member that rotates from the retracted position to the reference position in conjunction with the pair of arm members for holding the shaft component is provided, so that a common cylinder can be used. Even in automatic double-center types that drive a pair of arm members, the shaft parts can always be accurately positioned and held in the axial direction using the positioning member as a reference, and the shaft parts can also be positioned using the flange as a reference. This eliminates the need for center arm positioning stoppers and different center pins for each type and size of shaft parts, and eliminates the hassle of setup changes, improving equipment operating efficiency, etc. can be significantly improved.

Moreover, since the positioning member is configured to be able to be displaced to the retracted position, the dimensional margin when accessing the shaft component can be increased, and the movement control of the main body can be made easier accordingly.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a device constituting an embodiment of the present invention, and FIGS. 2a and 2b are diagrams showing its operating state. 1... Holder body, 3... Cylinder, 7, 7
... Center arm, 10 ... Operation rod, 10
a...Stepped guide surface, 11...Positioning block, w...Shaft workpiece, wf...Flange portion.

Claims (1)

[Scope of utility model registration request] A pair of arm members are driven by a common cylinder provided on the main body to expand and contract, and a center pin at the tip holds the shaft part in the axial direction. and a positioning member that is pivoted to and rotates to a reference position in conjunction with the movement of the arm member in the clamping direction and abuts against the flange portion of the shaft component to position the shaft component in the axial direction. Holding device for shafted parts.