JPH0121719Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a loader having a device for confirming whether the workpiece is a predetermined workpiece and whether it is correctly mounted when performing end face grinding of a different type of workpiece.

Prior Art Conventionally, when grinding the end faces of workpieces of different thicknesses, the thickness of the stopper on the end face of the chuck is changed to match the thickness of the workpiece, and the grinding surfaces of the end faces are aligned to be constant. However, if the end face stopper to be replaced is mistaken for one of a different thickness, or if the workpiece to which it is to be attached is mistaken, the grinding surface may not come to the specified position.

Purpose: Therefore, the present invention has been developed in view of the above, and it is an object of the present invention to provide a loader with a workpiece confirmation device that can easily confirm whether a given workpiece has been correctly installed and will not cause any work defects. It is something to do.

Solution: A mounting body with an axis parallel to the rotation axis, which is provided at the tip of a loader arm that attaches a workpiece by turning motion and movement in the direction of the rotation axis, and a mounting body that moves a specified amount in the axial direction. a sleeve that can be fitted into the sleeve; a spring that biases the sleeve in a protruding direction;
a workpiece pressing shaft that is movable in the axial direction on the sleeve; a pressing plate having a workpiece gripping portion at the tip of the pressing shaft; an air cylinder member that biases the pressing shaft in the projecting direction; an air nozzle opened toward the pressing plate; and a pressure detecting means for detecting a pressure drop in the source due to air jetting from the air nozzle when a gap is generated between the end face of the sleeve and the end face of the pressing plate; and means for detecting the end of movement toward the workpiece.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. The loader shaft 2 is placed on the headstock 1 of the grinding machine in the direction of the main shaft.
A mounting body 3 is provided to slidably and pivotally support the. A piston 4 is formed on the loader shaft 2, and this piston 4 is fitted into the cylinder 5 of the mounting body 3, and a pinion having a spline 6 cut therein and supported on the mounting body 3 by a bearing. It meshes with the female spline cut into the boss part of No.7. The loader shaft 2 has a loader arm 8 at its front end in a direction perpendicular to the axis, and a limit switch LS ₁ at its rear end at the left end and right end positions of the loader shaft 2.
Dog 9, which acts on LS ₂ , is fixed. The pinion 7 meshes with a rack 11 cut into the end face of a piston rod 10 fitted in a cylinder (not shown). A cylinder 15 is fixed to the tip of the arm 8 by welding or the like in a position that coincides with the center of the main shaft when the arm 8 rotates toward the front of the main shaft. Determine the axial position and divide bolts 1 into 3 equal positions.
8 to adjust the parallelism of the shaft center to the main axis of the grinding machine with respect to the mounting seat 16a of the mounting cylinder 16, and then the mounting cylinder 16 is fastened to the cylinder 15 by bolts 19. The mounting tube 16 has a through hole with a reduced diameter in the middle, and the large diameter portion on the rear side forms a cylinder 20. This cylinder 20 is closed by a lid 22 in which a piston 21 is fitted and has a flow path 22a. A sleeve 23 having a stepped through hole in the center with a larger diameter at the back is fitted into the large diameter front side of the mounting tube 16 so as to be slidable in the axial direction. A sleeve stopper 2 having an axial groove 23a cut in the outer periphery of the central part of the sleeve 23 and screwed onto the mounting tube 16
4, the amount of protrusion is regulated. A compression spring 25 is interposed between the large diameter part of the center hole and the reduced diameter part of the mounting tube 16 to bias the sleeve in the protruding direction. It is perforated. The workpiece pressing shaft 26 is inserted into the small diameter hole on the front side of the sleeve 23, passes through the reduced diameter part of the mounting tube 16, and the rear end is integrally connected to the piston 21 by a bolt 27, and an O-ring is attached at the reduced diameter part. This provides an oil-tight fit. A sphere 28 is attached to the tip of the workpiece pressing shaft 26 by a bolt 29, and a gripper-equipped pressing plate 30 having an end surface that comes into close contact with the end surface of the sleeve 23 is attached to a spherical seat 31 that receives the sphere 28.
It is supported in a floating structure by spherical bearings. The gripper portion 30a of the pressing plate 30 has a collection type sleeve 33 elastically covered by an O-ring 32 at two positions in the axial direction of the outer circumference of the boss, and grips the inner diameter of the workpiece. A nozzle 33 is opened in the front end surface 23b of the sleeve 23 and communicates with the flow path 23d through a circumferential groove 23c. Both channels 22a and 23d are connected to a pressure air source via a switching valve 34, and a pressure switch 35 is provided to detect the pressure of the source connected to channel 23d. 36 is a workpiece stopper of a diaphragm chuck provided at the tip of the spindle.

The operation of the present invention configured as described above will be explained.

The degree of tightness is adjusted using bolts 17 and 18 so that the test piece or regular workpiece is brought into contact with the stopper 36 using the gripper 30a and the pressure switch is not activated. In addition, when the sleeve 23 is pushed in at the mounting position of the regular workpiece, the gap m between the groove 23a and the sleeve stopper 24 is very small, 1 mm in this example.
At this time, the left end of the loader shaft 2 is determined so that the amount of forward clearance n of the piston 21, which is 1.5 mm in this example, satisfies the relationship n>m. When the loader shaft 2 is at the left end and the arm 8 is in the upper position, when the gripper portion 30a grips, for example, a gear material to be end-face grounded, the loader shaft 2 and the arm 8 move to the right and the piston rod 10 is moved by the action of a cylinder (not shown). is moved, the pinion 7 is rotated, the loader shaft 2 and the arm 8 are rotated, and the workpiece is positioned at a lower position on the line between the main axes.

Next, hydraulic pressure is sent to the right chamber of the cylinder 5, and the loader shaft 2 is moved to the left together with the piston 4, and the arm 8 is moved to the left.
The workpiece of the gripper 30a at the end is brought into contact with the stopper 36 of the chuck by the pressing plate 30 by the sum of the pressure of the spring 25 and the pressing force acting on the piston 21.

In this case, when the workpiece is in proper contact with the stopper, the end face of the pressing plate 30 and the end face 23b of the sleeve 23 are in close contact with each other, and the source is not depressurized and the pressure switch 35 does not output a signal. . In addition, the sleeve stopper 24 and the sleeve 23
The gap m between the grooves 23a is 1 mm. If the workpiece is not gripped correctly by the gripper 3a and comes into contact with the workpiece stopper 36 in an inclined manner, a gap will be created between the end face of the mounting plate 30 and the sleeve end face 23a, and the nozzle 3
Since air is ejected from 3, the pressure of the source is reduced, and the pressure switch 35 issues a signal indicating that the installation is defective. In addition, if the workpiece stopper 36 is installed that does not fit the workpiece, or if the gripper grips a workpiece that is not compatible with the stopper 36, if the workpiece width is narrow or the stopper 36 is short, the sleeve 23 will not fit properly. The force of the spring 25 pushes out m amount, that is, 1 mm, until it is regulated by the sleeve stopper 24, and the air pressure acting on the piston 21 pushes out the pressing shaft 26, n amount, that is, 1.5 mm, and the mounting plate 30
Since n>m between the end face and the sleeve end face 23b, there is a gap of n-m, that is, 0.5 mm, in the nozzle 33.
Air is ejected from the source, the source pressure decreases, and the pressure switch 35 issues a signal. Also, if the workpiece width is thick or the workpiece stopper 36 is long, the loader shaft will not move the specified amount in the leftward direction, so the leftward end limit switch LS ₁ will not work, indicating an abnormality. be done.

Effects As detailed above, the present invention double-fits a sleeve and a pressing shaft into the loader mounting cylinder, and provides a pressing plate with a gripper supported in a floating structure at the tip of the pressing shaft, so that the end surface of the pressing plate and A circuit is provided to determine whether the sleeve ends are in close contact or there is a gap. Furthermore, the pushing shaft is configured to move forward more than the sleeve moves forward, and the normal movement position of the loader is detected. It is possible to check the inclination of the plate, the inclination of the workpiece that causes a gap between the pressing plate and the sleeve, and the mismatch between the workpiece stopper and the workpiece width, which can lead to defective workpiece processing or damage to the grinding wheel. This has the effect of being able to prevent this in advance.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view of the mechanism of the loader, FIG. 2 is a cross-sectional view of a gripper-related portion at the tip of the loader, and FIG. 3 is a view taken along line AA in FIG. 2. 2...Loader shaft, 8...Arm, 16...Mounting tube, 21...Piston, 23...Sleeve, 25
... Spring, 26 ... Pressing shaft, 28 ... Sphere, 30
...Press plate, 30a...Gripper part, 33...Nozzle, 35...Pressure switch.

Claims (1)

[Scope of utility model registration request] A mounting body having an axis in a direction parallel to the rotation axis, which is provided at the tip of a loader arm that attaches a workpiece by rotational movement and movement in the direction of the rotation axis, and a mounting body that is capable of moving a specified amount in the axial direction. a fitted sleeve; a pressing means for urging the sleeve in the projecting direction; a workpiece pressing shaft that is loosely fitted into the sleeve and movable in the axial direction by a slightly larger amount than a specified movement amount of the sleeve; a pressing plate having a workpiece gripping portion at the tip of the shaft; a fluid pressure means for urging the pressing shaft in a protruding direction; an air nozzle opening toward the pressing plate at the end face of the sleeve; and an end face of the sleeve and the pressing plate. and means for detecting the end of movement of the loader arm toward the workpiece. A loader with a workpiece confirmation device featuring: