JPS6119363B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Objective of the Invention) The present invention is designed to grip a workpiece by a chuck using a rotary gripping tool extended out from the front of the chuck, and to process the base part of the workpiece after the tip part of the workpiece has been machined. This invention relates to a workpiece reversing device used in turning operations, the purpose of which is to reverse the workpiece and have it gripped by a chuck.

(Prior art) Conventionally, after finishing machining the tip of a workpiece, the machine is temporarily stopped and the machine is manually reversed and gripped to process the base. The finished parts were set on a pallet on an automatic feeder and the original part was machined, but this was inefficient as it caused a loss in machining time due to interruptions in the automatic machining operation.

(Structure of the Invention) In view of the above-mentioned problems, the present invention has been developed in which a gripping tool is attached via a rotary plate to the tip of the rod of an automatic workpiece feeding device that retreats to the front of the chuck of a lathe. The following figure will be explained.

In Figures 1 and 2, the work reversing device 1 has a mounting base 3 on a machine base 2 installed on the side of a chuck C of an NC lathe or an automatic lathe (hereinafter referred to as lathe) L. The lateral movement guide shafts 5, 5 are inserted into the sliding bearings 4, 4... provided on the table 3 in a direction parallel to the axis X-X of the main shaft S of the lathe L, and the lateral movement guide shafts 5, 5 are The base end of a lateral movement air cylinder 8, which has the tip of a rod 7 attached to the side surface of a holding stand 6 whose bottom portion is fixed approximately in the center, is pivoted to a part of the mounting stand 3, X
- The front and rear ends of the upper and lower advance/retreat guide shafts 9, 9 inserted in the direction perpendicular to X are connected to the connecting plate 1, respectively.
An air cylinder 1 for advancing and retracting is connected with 0 and 11 and fixed to the upper part of the holding table 6 via a bracket 12.
The tip of the rod 14 of No. 3 is fixed to the upper part of the front connecting plate 10, and a rotating device 15, which will be described later, is attached to this connecting plate 10.

The rotating device 15 will be described in detail in FIGS. 3 and 4.
In the figures and FIG. 5, the rotating device 15 has a support plate 1 on the front side of the connecting plate 10 (see FIGS. 1 and 2).
6 is provided protrudingly, a rotating shaft 17 is mounted near the tip of this supporting plate 16, and a large gear 19 meshed with a small gear 18 fixed to this rotating shaft 17 is rotated by a shaft 20 on this supporting plate 16. The tip of the rod 23 of the rotary air cylinder 22 is freely supported and has its base end 21 pivoted near the base of the support plate 16, and is connected to the large gear 19.
A rotary plate 26 is fixed to the tip of the rotary shaft 17, and a gripping device 27, which will be described later, is attached to the rotary plate 26. To explain the gripping device 27 in detail, as shown in FIGS. 3 to 5, slide bars 28 and 29 each having a rectangular cross section are attached to the front and rear edges of the lower surface (the lower surface in FIG. 4) of the rotary plate 26 on the supporting plate 30. , 31 in parallel,
The bases 34 and 35 of the front gripping tool 32 and the rear gripping tool 33 are attached to the slide bars 28 and 29, respectively.
A pin 42 is loosely fitted into the rotary plate 26 and has elongated holes 40 and 41 at the ends of L-shaped moving arms 38 and 39 having fulcrums 36 and 37 on the upper surfaces of the bases 34 and 35, respectively. . It is pivoted to brackets 52, 53 provided on the support plates 31, 30, and the base 34,
35, each of which has a gripping rod 5 facing downward.
4,555, gripping upper claws 56,5 are provided at the base of each
7 is pivoted, and lower gripping claws 58 and 59 are respectively pivoted to the lower end, and between the upper gripping claw 56 and the lower gripping claw 58 at the front and the upper gripping claw 57 and the lower gripping claw 59 at the rear. Air cylinders 60 and 6 for gripping, respectively.
1 will be constructed. The support 16 is provided with a positioning stopper 62 (FIG. 3,
Fig. 4).

(Object of the Invention) To explain the operation of the present invention with reference to the drawings of the embodiments, in Figs. Holding of the rotation positioning device 15, which is guided by the advance/retreat guide shafts 9, 9 penetrating the horizontally movable holding table 6 by the air cylinder 8, and is attached to the tip of the rod 14 of the advance/retreat air cylinder 13 via the support plate 16. An air cylinder 6 for gripping the large diameter portion W' of the work W is attached to the front gripper 32 of the device 27.
0 to grip it, operate the advancing/retracting air cylinder 13 to push the rotating device 15 at the tip with the workpiece W set to the front of the chuck C of the lathe L, actuating the lateral movement air cylinder 8, When the workpiece is moved horizontally in the direction of arrow A and brought close to chuck C, chuck C engages the small diameter portion W'' of workpiece W.
Lateral movement air cylinder 8 is opposite arrow B
The next advance/retreat air cylinder 13 operates in the direction of arrow Q, which is opposite to the previous one, and retreats. During this time, the lathe L is moved away from the chuck C.
A predetermined turning process is performed on the large diameter part W' of the chuck C, and when the turning process of the large diameter part W' is completed, the rotating device 15 is again fed out to the front of the chuck C.
approach.

Next, in FIG. 6, the front gripping tool 32 of the gripping device 27 attached to the rotating device 15 that is close to the chuck C is used to hold the large diameter part of the workpiece W that has been turned.
When W' is grasped, chuck C is released.

Next, in FIGS. 3 and 4, when the front moving air cylinder 48 is activated, the front gripping tool 32 moves the workpiece W through the L-shaped moving arm 38.
At the same time, the rear gripping tool 33 slides on the slide bar 28 in the direction of arrow B via the moving arm 39 due to the operation of the moving air cylinder 49, while holding it.
As shown in FIG. 7, the front gripper 32 and the rear gripper 33 are switched, and the rear gripper 33 operates to grip the small diameter portion W'' of the workpiece W being gripped by the front gripper 32. do.

Next, in Fig. 3, the moving air cylinder 4
8 and 49 operate simultaneously in the opposite direction, the rear gripper 33 gripping the workpiece W moves in the direction of arrow B, and the front gripper 32 releases its grip on the workpiece W, as shown in FIG. moves in the direction of arrow A and returns to the switched position.

Next, in FIGS. 3 to 5 and 9,
When the rotating air cylinder 22 provided on the side of the support plate 16 on which the rotating device 15 is placed operates and pushes the rod 23 in the direction of arrow P, the lever 24 whose tip is pivoted to the tip of the rod 23 is moved. The small gear 18 rotates in the direction of the arrow R together with the large gear 19 connected to the lever 24, and the small gear 18 meshed with the large gear 19 rotates in the direction of the arrow R.
Since the rotating shaft 17 is fixed to the small gear 18, the rotating plate 26 to which the gripping device 27 is attached rotates in the direction of the arrow R', and the large gear 19 rotates in the direction of the arrow R'.
When the rotation is stopped by the position stopper 62,
The rotating plate 26 fixed to the small gear 18 also has the rotating shaft 17.
Since it rotates 180 degrees around the rotation plate 26, the rear gripping part 33 of the gripping device 27 provided on the rotary plate 26 grips the small diameter part W'' of the unprocessed workpiece W, and the released front gripping tool 32 The positions are swapped by rotating 180 degrees, and the machined large diameter part W' of the workpiece W, whose small diameter part W" is held by the rear gripping tool 33, faces the chuck C, and by the action of the lateral movement air cylinder 8, the processed large diameter part W' faces the chuck C. It moves in the direction A and approaches the chuck C, and the chuck C engages the large diameter part W', and as before, the rotating device 15 is retracted and the small diameter part W'' of the workpiece W is turned. In other words, the workpiece W has been reversed.

(Effects of the Invention) The present invention provides a workpiece gripping device such as an automatic material feeding device in an NC lathe or an automatic lathe, in which a pair of front and rear gripping tools are slidable on a rotating plate, and the position is moved by sliding. In addition, the rotary plate with the gripping device can be rotated 180 degrees, so when turning the entire surface of a solid material, the material can be turned over and placed into the chuck after the first half of the process is completed and the second half of the process is carried out. Re-gripping can be done automatically and continuously without relying on human hands, and the effect of significantly improving production efficiency is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of a material supply device embodying the present invention, FIG. 2 is a front view of the same, FIG. 3 is an enlarged plan view of the main parts of the present invention, and FIG. 4 is a front view of the same, FIG. 5 is a side view of the same, and FIGS. 6 to 9 are explanatory diagrams of the operation of the present invention. Explanation of symbols of main parts, 1...Work reversing device, 2...Machine base, 6...Holding stand, 8...Air cylinder for lateral movement, 9...Advance/retreat guide shaft, 1
3... Air cylinder for advancing and retreating, 15... Rotating device, 16... Support plate, 17... Rotating shaft, 18...
Small gear, 19... Large gear, 22... Rotating air cylinder, 24... Lever, 26... Rotating plate,
27... Grasping device, 28... Slide bar (front), 29... Slide bar (rear), 32... Front gripping tool, 33... Rear gripping tool, 38... Moving arm (front), 39 ...Movement arm (rear), 48...Movement air cylinder (front), 49...Movement air cylinder (rear), 60...Gripping air cylinder (front), 61...Gripping air cylinder ( rear), 62...positioning stopper, L...lathe, C...chuck, W...work.

Claims (1)

[Claims] 1. A holding stand was mounted on a machine stand provided on the side of the chuck of the lathe so that it could move laterally parallel to the main axis of the lathe, and was provided so as to be able to pass through this holding stand and slide freely in a direction perpendicular to the main axis. An advancing/retracting guide shaft is made to move forward and backward toward the front of the chuck using an advancing/retracting air cylinder, and a rotary plate with a gripping device on the bottom surface is rotated around a rotation axis perpendicular to the main axis via a support plate at the tip of the advancing/retracting guide shaft. The rotary shaft of the rotary plate can be freely rotated 180 degrees in forward and reverse directions through a lever, a gear mechanism, and a positioning stopper by means of a rotating air cylinder provided on the support plate, and the main axis on the lower surface of the rotary plate is A slide bar having a rectangular cross section is provided parallel to each other near each side that is parallel to A workpiece reversing device for lathe work, characterized in that both gripping tools are movable on the slide bar via a moving arm so that the positions of the gripping tools relative to the chuck can be changed.