JPH0249855B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a holding device for an NC indexing table.

[Conventional technology]

Conventionally, when placing a workpiece on an NC circular table and cutting the surrounding sides, for example,
Use the presser foot to hold the part other than the cutting surface by tightening the bolts from above, and when the cutting process is finished, use the presser foot to hold this part so that it does not move, and then tighten the presser foot near the next cutting surface. removal,
Cutting was performed while sequentially moving from tightening location to location.

[Problems to be solved by the invention] However, the presser foot is usually tightened with bolts, and tightening and loosening the presser foot requires a lot of effort and time. If the workpiece is small, it takes a lot of time and effort to change the position of the presser foot, even though the cutting time is short.Moreover, if the workpiece is small, it is difficult to hold it with the presser foot, making it even more troublesome. It had some problems.

The present invention solves these problems and eliminates the need to change the position of the presser foot of the workpiece on the indexing machine each time it is cut, which greatly contributes to labor savings and improves the processing speed of the indexing machine. This invention is expected to significantly improve work efficiency.

[Means for solving problems]

In order to achieve the above object, in the indexing table holding device of the present invention, at the lower end of the cylinder telescopic shaft provided downward from the column strung across the NC indexing table,
A pressing cylinder is provided with a built-in rotating pressing spring that is always pressed downward and rotates in the horizontal direction, and is held by an arm rod, and the pressing cylinder is constantly pressed downward by the rotating pressing spring on the underside of the pressing cylinder, and , a cylindrical holding rotation surface that rotates in the horizontal direction is provided, a tapered lifting surface is provided on the upper end side of the holding rotation surface, and the lifting surface is in contact with the lifting surface around the lower surface position of the lifting surface. A lifting ring for lifting is installed around the lower surface of the push-up cylinder.

[Effect]

When the cylinder of the holding device of the NC indexing table configured as described above is energized and the telescopic shaft of the cylinder is lowered downward, the pressing copper and the holding rotation surface also descend together, and the holding rotation surface The lower surface first contacts the upper surface of the presser foot, and then the press cylinder is lowered further, compressing the rotary press spring and lowering the press cylinder.Finally, the press surface provided on the bottom surface of the press cylinder turns the press surface downward. The pressing force of the cylinder strongly presses the presser foot and the object to be cut against the indexing table through the holding rotating surface.In this state, for example, cut one side of the object with a cutting knife. do. Next, after the cutting of this side is completed and before the indexing table is rotated to the desired angle, the telescopic shaft of the cylinder is raised to a certain height and the crotch frame is stopped at a certain height position (in this case (For example, the height position is sensed by a limit switch) The strong pressing force on the pressing surface mentioned above is released as the pressing cylinder rises, but the downward pressing force on the pressing surface by the rotating pressing spring still remains. , has the effect of holding the object to be cut on the indexing table, so when the indexing table is rotated to a desired angle in this state, the object to be cut rotates together while being held down by the indexing table, and the rotational pressure is While the spring remains pressed, it rotates smoothly along with the rotation receiving shaft using a thrust bearing. When the cylinder is biased again at a position rotated through the desired cutting angle, a strong pressing force is obtained in the same manner as described above, and cutting becomes possible. Next, when the telescopic shaft of the cylinder is pulled upward greatly, the lifting surfaces of the pressing cylinder and the holding rotation surface come into contact and rise together, allowing the workpiece to be removed from the indexing table.

〔Example〕

Examples will be explained with reference to the drawings. 1
is a pillar formed in a substantially inverted U-shape so as to straddle the upper side of the indexing table 2. Reference numeral 3 denotes a telescopic shaft of a cylinder provided vertically downward at approximately the center of the horizontal frame 4 of the support 1. 5 is a pressing cylinder fixed to the lower end of the telescopic shaft 3. Reference numeral 6 denotes a reinforcing arm that holds the periphery of the press cylinder 5 in the center and has an arm rod 7 extending in the left and right directions, and grooves 8 are carved at both ends of the arm rods 7, 7. The groove 8 is fitted into the sliding strip 10 vertically protruding from the inner surface of the left and right vertical columns 9, 9 of the support 1 so as to slide automatically in the vertical direction. Reference numeral 11 denotes a rotation connecting hole bored upward from the lower surface side of the press cylinder 5. Reference numeral 12 denotes a thrust bearing provided at a position on the inner side of the rotation connecting hole 11. Reference numeral 13 denotes a rotation receiving shaft fitted to the inner diameter surface of the thrust bearing 12, and a collar 14 is provided in a circular shape with a flange 14 projecting around the circumference. Reference numeral 15 denotes a rotational pressure spring whose upper end is attached to the collar 14, and which is fitted into the lower half of the rotation receiving shaft 13 and loosely fitted into the rotation connection hole 11. 1
Reference numeral 6 denotes a cylindrical pressing and rotating surface provided below the lower surface 17 of the pressing cylinder 5. Reference numeral 18 denotes a lifting surface formed on the outer peripheral portion of the upper end of the holding rotation surface 16 in a tapered shape that becomes larger in diameter toward the upper side. Reference numeral 19 denotes a circular pressing surface with the lifting surface 18 provided obliquely in its lower half. Reference numeral 20 denotes a core holding protrusion that protrudes upward at the center of the upper surface of the pressing surface 19, and
5, to prevent center runout of the holding rotation surface. Reference numeral 21 denotes a lifting ring having a lifting surface 22 formed on the inner surface around the lower position of the lifting surface 18 and formed by a tapered surface on the female side having approximately the same slope as the lifting surface 18. The screw 23 is screwed onto the lower surface 17 of the press cylinder 5. Reference numeral 24 denotes a pressing surface provided on the lower surface 17 with a slight downward bulge. The other reference numeral 25 denotes an object to be cut, which is placed on the upper surface of the indexing table 2 via a receiving metal 26, and is pressed from above with a presser metal 27. 28 is a cutting tool (for example, a cutter). Furthermore, if the pressing surface 24 and the cylinder's telescopic shaft 3 are provided at a slightly more central position than the center of the pressing cylinder 5, but at a position opposite to the cutting position by the cutting blade 28, a stronger pressing holding force can be expected.

〔Effect of the invention〕

By carrying out the present invention, the trouble of sequentially moving the position of the presser foot that is bolted every time it is cut is completely eliminated, and rotational machining using the indexing table is possible simply by operating the cylinder that operates instantly. This invention greatly contributes to improving work efficiency and labor saving, especially for small items.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the present invention. FIG. 2 is a longitudinal sectional view of the main part. FIG. 3 is a plan view of the main part. 1... Support column, 2... NC indexing table, 3... Cylinder extension shaft, 4... Horizontal frame, 5... Press cylinder, 6...
... Reinforcement arm, 7 ... Arm rod, 8 ... Groove, 9 ... Vertical column, 10 ... Sliding strip, 11 ... Rotating connection hole, 12
... Thrust bearing, 13 ... Rotation receiving shaft,
14... Tsuba, 15... Rotating pressure spring, 16... Holding rotation surface, 17... Bottom surface, 18... Lifting surface,
19... Pressing surface, 20... Core holding protrusion, 21...
Lifting ring, 22... Lifting surface, 23... Screw, 24... Pressing surface, 25... Work to be cut, 26...
...receiver, 27...presser metal, 28...cutting knife, 29...limit switch.

Claims (1)

[Claims] 1 A rotary pressing spring that constantly presses downward and rotates laterally is built into the lower end of the cylinder telescopic shaft, which is installed downward from the column strung on the NC indexing table, and is held by an arm rod. A pressing cylinder is provided, and a cylindrical holding rotating surface that is constantly pressed downward by the rotating pressing spring and rotating laterally is provided on the lower side of the pressing cylinder, and the upper end side of the holding rotating surface is provided. A tapered lifting surface is provided at the lower side of the lifting surface, and a lifting ring that touches and lifts the lifting surface is provided around the lower surface of the push-up cylinder, so that the material to be cut can be rotated and pressed even when the workpiece is rotated. A holding device for an indexing table, characterized in that a workpiece to be cut is fixed to the indexing table via a holding rotation surface using a spring.