JPS6210010Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a device for reversing objects to be handled.

For example, in the case of a workpiece such as a gear blank that is gripped and machined using a chuck, in order to process the chuck side, the workpiece position must be rotated 180 degrees from the end where the chuck grips the other end. I have to move and grab it again. This 180 degree rotation of the workpiece is called reversal. FIG. 1 is a front view of a two-axis automatic turning machine. head stock 1
The work W gripped by chucks 2 and 3 fixed to the end of the main spindle mounted on the main shaft is turned by the cutting tools of tool stands 5A and 5B that reciprocate in the direction of arrow A in the figure, respectively orthogonal to the two parallel main axes. Processed. There are many ways to process a workpiece mounted on the two axes of such a two-axis turning machine. In other words, those that perform the same processing,
The workpiece W machined by one axis is removed from the chuck 2, reversed, and then mounted on the chuck 3. A machining line is configured using multiple machines, and when the workpiece is transferred between machines, the workpiece W is reversed and the workpiece is transferred to the next chuck. A machine that processes the opposite end of the machine that previously processed the machine,
There are examples.

Conventionally, when transporting and reversing a workpiece as described above, separate drive devices are used for transporting and reversing, or the shaft 6 at the bisecting position of the workpiece W is used as shown in the plan view in FIG. Centered on , as shown by arrow B.
The swing arm 7 is equipped with a swing arm 7 that rotates 180 degrees, and a work grasping device 8 at the end of the swing arm 7 holds the work W on the right (indicated by the chain double-dashed line), and the work W on the left is gripped by the swing arm 7 rotating 180 degrees. The inversion is performed so that

For this reason, in the former case, the workpiece is transferred from the transfer device to the reversing device, the reversing device rotates, and then the workpiece is transferred to the transfer device again, so there are many operations, and at that time, confirmation is performed by a switch, so the sequence takes a long time. Ru. In addition, when using the latter swing arm, the workpiece is rotated and reversed, so the speed cannot be increased and a large amount of space is required due to the swinging action.

This invention provides an inverting device that requires the operations of transporting and reversing the object, which has the functions of reversing and transferring the object with a small space and short operating time. The purpose is to

In this device, a conveying device that moves while being guided by a linear guide has a shaft rotatably supported so as to have an axial direction that intersects the conveying direction, and a grasping device for the object to be handled is attached to one end of the shaft, and a device to grasp the object is attached to the other end of the shaft. The guide arms are arranged so as to interlock with each other, and a cam follower provided at the end of the guide arm engages with a grooved cam provided parallel to the linear guide.

Embodiments of this invention will be described below with reference to the drawings. FIG. 3 is an embodiment of the invention shown in cross section. The work W1 on the right side is reversed and the work W2 shown on the left side is to be transported to the work W2 (the work W1 is reversed and the direction is different). For example, the work W1 is held by the chuck 2 in Fig. 1. The workpiece W2 has been re-grabbed from chuck 2 to chuck 3 of the machine shown in FIG. 1 described above.

A conveying device 12 is fitted into two parallel guide rails 11 fixed to the frame 9 so as to be guided and moved, and the piston rod end of a hydraulically operated cylinder 13 is fixed to the frame 9 in parallel to the guide rails 11. serves as a driving means for the conveying device 12. The driving means of the transport device 12 is not limited as long as the transport device can reciprocate between the works W1 and W2.

Bearings 14 and 15 are mounted on the conveyance device 12,
A shaft 17 for grasping the workpiece is rotatably supported by the bearings 14 and 15, and the shaft 17 is supported so as not to move in the axial direction by a step 17A of the bearing 15 and the shaft 17, and a nut 18 screwed into the shaft 17 and holding down the inner ring of the bearing 14. has been done. The cylindrical sleeve 19 fits into the shaft 17 and the bearings 14, 15
placed in between.

At one end of the shaft 17, a work gripping device, generally designated by the reference numeral 21, is attached. Although the work grasping device 21 is not limited to this, for example, when the workpiece grasping device 21 is attached to the already laid chucks 2 and 3 and the chuck work is being processed, at least the grasping claws 22 move perpendicular to the plane of the paper in FIG. Alternatively, as shown in FIG. 4, a pair of grasping claws 22 may rotate about a shaft 23 to move away from each other and move toward each other to open and close.

A guide arm 24 is fixed to the end of the shaft 17 opposite to the end to which the work gripping device 21 is attached, and a guide roller 25 is rotatably attached to a shaft fixed near the end of the guide arm 24.

A cam plate 26 is fixed to the frame 9 in parallel with the guide rail 11, and a cam groove 27 is provided in the cam plate 26.

FIG. 5 is a view taken along arrow A in FIG. Cam groove 27
There are straight portions 27A and 27B at both ends on a straight line L that is parallel to the guide rail 11 and passes through the intersection of the center extension of the shaft 17 and the cam plate 26. Their lengths l1 and l2 do not need to be the same length,
Further, if the distance for only transporting the workpiece without reversing it is unnecessary, the lengths l1 and l2 may not be necessary. Point 27 following straight line portions 27A and 27B
Shaded portions 27C and 27D are cut diagonally from a and 27b, and are connected at a top portion 27d. Top 27
Although d is rounded with an arc, it may also have a corner.
That is, the cam groove 27 has a chevron shape. The distance H between the straight line L and the top 27d is set equal to the radius from the center of the shaft 17 to the center of the guide roller 25, that is, the radius of the swinging cam follower.

A reversal prevention roller 29 is rotatably attached to a shaft 28 fixed to the cam plate 26, which is disposed with a line (not shown) passing through the top 27d of the cam groove 27 and perpendicular to the straight line L as an axis of symmetry. The end of the guide arm 24 can fit between the reverse rotation prevention rollers 29.

30 is a dog provided on the conveying device 12,
At the end of the stroke of the conveying device 12, it engages with a micro switch 31 fixed to the frame 9 to generate a signal to stop the cylinder 13.

The reversing device is separated from the workpieces W1 and W2 on the machine in the axial direction, and when the two-axis automatic turning machine stops, the workpiece W2 that has been processed is carried out by an unloader (not shown). Next, the frame 9 is moved in the direction of arrow D shown in FIG. 5 by a sliding device (not shown),
The open grasping claw 22 enters the position of the workpiece W1. The grasping claws 22 are closed to grasp the workpiece W1 which has been machined on only one side in the axial direction, and the chuck 2 is loosened. Subsequently, the frame 9 moves in the direction opposite to arrow d and extracts the workpiece W1 from the chuck 2.

At the position where the chuck 2 is pulled out, the cylinder 13 is energized to the left in FIGS. 3 and 5, the conveying device 12 is guided by the guide rail 11 and moves to the left, and the workpiece W1 is transferred to the left. . Guide roller 2
5 moves along the straight line portion 27A of the cam groove 27, during which time the shaft 17 does not rotate and the work W1 does not reverse. The guide roller 25 is connected to the diagonal line part 2 of the cam groove 27.
7C, the guide arm 24 rotates clockwise around the shaft 17 in FIG. 5, and the shaft 17 rotates in the same direction. The work grasping device 21 and the work W1 also rotate in the same direction. Near where the guide roller 25 reaches the top 27d of the cam groove 27, the tip of the guide arm 24 touches the anti-reverse roller 29.
The guide roller 25 begins to move between the top portions 27 and 27.
d, the tip of the guide arm 24 is clamped by the anti-reverse roller 29. When the guide roller 25 coincides with the top portion 27d, the workpiece W1 has rotated 90 degrees.

As the conveying device 12 continues to move, the end of the guide arm 24 cannot be moved by the reverse rotation prevention roller 29, so the guide arm 24 has no choice but to rotate in the same direction around the shaft 17, and the guide roller 25 moves along the diagonal line of the cam groove 27. Enter section 27D. Conveying device 12
As the movement progresses, the guide roller 25 moves toward the shaded area 27.
Proceeding through D, the guide arm 24 rotates, and as a result, the work gripping device 21 rotates through the rotation of the shaft 17, and the work W1 continues its reversing operation. When the guide roller 25 reaches the point 27b, the guide arm 24 has rotated 180 degrees from the beginning, and the workpiece W1 has rotated 180 degrees to become the workpiece W2.

Further, the conveying device 12 advances by a distance l2 due to the energization of the cylinder 13, and the guide roller 25 moves into the cam groove 27 without rotating the guide arm 24.
The workpiece W2 moves along the straight line portion 27B of the chuck 3 and comes to a position that coincides with the center of the chuck 3 while maintaining its posture.

At this point, the frame 9 moves in the direction of arrow D, the work gripping device 21 supports the work W2, inserts the work W2 into the chuck 3, and the chuck 3 is tightened.

When the chuck 3 is tightened, the grasping claws 22 are opened, the frame 9 moves in the opposite direction of arrow D, and the grasping claws 22 move away from the workpiece W2. And cylinder 13 is the third
In FIG. 5, the conveying device 12 is urged rightward and guided by the guide rail 11 to move to the right. When the conveyance device 12 moves to the right, the guide roller 2
5. The guide arm 24, the shaft 17, and the work grasping device 21 operate in the opposite manner to those described above, and the work grasping device 21 rotates by 90 degrees due to the rotation of the shaft 17 and stands by. Meanwhile, a material workpiece is attached to chuck 2 on the right side, and the machine is started.

Even if there is no reverse rotation prevention roller 29, the guide arm 24 will move toward the top 27d of the cam groove 27 in the above-described operation.
When passing through, the guide arm 24 rotates due to the movement of the conveyance device 12, so normally the guide arm 24 passes through the top 27d and moves to the next shaded area 27D (outward stroke) and the shaded area 27.
It continues to rotate in the same direction as C (homeward stroke). However, at the top 27d, the guide arm 24
can also be reversed, so when reversal is started, the workpiece will not be reversed and will return to its original position, with only the position changing. The anti-reverse roller 29 has the effect of ensuring that the guide arm 24 rotates in the same direction when it passes the cam groove top 27d.

In the above explanation, the rotation angle of the guide arm 24 is
In order to obtain 180 degrees, the radius R from the shaft 17 to the guide roller 25 and the distance H between the cam groove top 27d and the straight line L are made equal, but if R≧H, the operation is performed. If R>H, guide arm 24 is 180
As shown in FIG. 6, a shaft 32 for rotationally supporting the guide arm 24 is provided on the conveying device 12 in parallel with the shaft 17, and a pair of shafts 32 that engage between the rotationally supporting shaft 32 of the guide arm 24 and the shaft 17 are provided. The speed may be increased and transmitted by the gears 33, 34 or a timing belt, and the shaft 17 may be rotated 180 degrees.

Figures 7A, B, and C are front views of a two-axis turning machine equipped with a loader using this invention. This figure shows the machine shown in FIG. 1 equipped with an autoloader (hereinafter referred to as loader) 35 and a work reversing device 36 of this invention. The loader 35 is attached to a support member (not shown) mounted on the headstock 1, and moves in the direction of the arrow H shown in FIG. 8 of the plan view of FIG. is attached to the machine, and the chute conveyor 37 and the reversing device 36 are in one position for attaching and detaching the workpieces, and the other is the position shown by the two-dot chain line in the figure. It is now possible to take a position where it can rotate without interference in the center. The frame 9 of the reversing device is fixed. In the figure, the circle showing only the outer periphery is the material workpiece W0, and the right half of the circle shown in black is the semi-finished workpiece W1, which has only been machined on one side in the axial direction. The part shown filled in black is a half-processed workpiece W2 obtained by inverting the workpiece W1, and is sequentially transferred to and removed from the fully processed workpiece W2', whose circles are all filled in black.

Although not shown, the surfaces 39 and 41 of the loader 35 are provided with grasping devices for simultaneously grasping two workpieces.

In FIG. 7A, cutting has been completed and the loader 35 is in its original position, and the chuck 3 on the left has a fully machined workpiece W2',
There is a semi-processed workpiece W1 in chuck 2 on the right, and the 8th
The loader 35 is located at the position indicated by the two-dot chain line in the figure. The conveying device 12 of the reversing device 36 is reversed and located at the left end, the work grasping device 21 grasps the work W2, and one work W0 that can be engaged with the loader 35 is waiting at the end of the chute conveyor 37. ing.

When the machine starts, the loader 35 rotates 120 degrees clockwise about the shaft 38, and then returns to the headstock 1.
It moves to the side and becomes as shown in Fig. 7B. The grasping device of the loader 35 (not shown) on the surface 39 side is chuck 2,
3, the grasping device of the loader 35 (not shown) on the surface 41 side grasps the workpiece W0 at the end of the chute conveyor 37, and the workpiece W2 grasped by the workpiece grasping device 21 of the reversing device 36. The grip, work gripping device 21, and chucks 2 and 3 become loose. Then, the loader 35 moves axially away from the headstock 1 in the direction of the arrow H to load the works W1 and W2' into the chucks 2 and 3.
Pull it out further and rotate it 120 degrees clockwise until it becomes as shown in Figure 7C. At the same time, the empty work grasping device 21 moves to the right.

Subsequently, the loader 35 moves toward the head stock 1 side until the workpieces W0 and W2 enter the chucks 2 and 3, and the workpiece W2' is carried out by, for example, a chute (not shown) in the direction of the arrow shown, and the semi-processed workpiece W1 is the work grasping device 21 of the reversing device 36
It can be added to the mouth. And chucks 2 and 3 are tightened.

The loader 35 moves in the direction of the arrow H away from the head stock 1, the machine starts, and machining begins.The loader turns counterclockwise, and at the same time the machine starts, and the semi-processed workpiece W2 held by the chuck 3 is fully machined, and the workpiece W0 held by chuck 2 is partially machined. During this time, the work grasping device 21 moves to the left, and the work W1 is reversed to become the work W2, resulting in the state shown in FIG. 7A.

In such an example of use, a loader, conveyor, tool stand, etc. are arranged around the main shaft that performs machining, and the above-mentioned loader, which operates at an extremely high speed, rotates, so the range of motion of the reversing device is minimized. Small things are required. Therefore, the reversing device of this invention is suitable because the workpiece is slightly rotated and reversed under the hanging shaft during reciprocating movement.

As described above, this invention has a conveying device that rotatably supports a shaft, a device for grasping the object to be handled at one end of the shaft, and a guide arm that rotates in conjunction with the shaft at the other end of the shaft. Since the rollers are engaged with the cam grooves and the cam grooves are chevron-shaped, the objects to be handled can be transported and reversed simply by moving the transport device. Therefore, there is no need for switches or wiring when moving the object to be reversed or from reversing to transport. A device that drives the reversing device, such as a hydraulic rotary cylinder and its piping, is not required, so complicated support is required to prevent the piping of the reversing device from interfering with the machine when installed on a machine such as a two-axis automatic turning machine. Doesn't require any means. Since there is no need to confirm both the reversing and conveying movements using switches, the conveying device can move between two positions without stopping, so the operation is extremely fast.

If a reverse rotation prevention roller is disposed above the top of the chevron-shaped cam groove and the guide arm is allowed to enter between the rollers, reverse rotation of the guide arm can be reliably prevented.

[Brief explanation of the drawing]

Figure 1 is a front view of a two-axis automatic turning machine, Figure 2 is a plan view of a swing arm reversing device, Figure 3 is a sectional view of an embodiment of this invention, and Figure 4 is another example of a work gripping device. 5 is a view taken in the direction of arrow A in FIG. 3, FIG. 6 is a plan view showing another embodiment of this invention, and FIGS. 7A, 7B, and 7C are views of this invention. FIG. 8 is a plan view of FIG. 7A. 1...Headstock, 2,3...Chick,
5... Tool stand, 6... Axis, 7... Swing arm, 8... Work gripping device, 9... Frame, 1
1... Guide rail, 12... Transfer device, 13...
... Cylinder, 14, 15 ... Bearing, 17 ... Shaft, 18 ... Nut, 19 ... Sleeve, 21
...Work grasping device, 22...Grasping claw, 23...
Shaft, 24... Guide arm, 25... Guide roller, 26... Cam plate, 27... Cam groove, 27A,
27B... Straight line part, 27a, 27b... Point, 2
7C, 27D...Shaded area, 27d...Top, 28
...shaft, 29 ... reverse rotation prevention roller, 30 ... dog, 31 ... micro switch, 32 ... shaft, 3
3, 34...Gear, 35...Loader, 36...Reversing device, 37...Chute conveyor, 38...
Axis, 39, 41...plane, W0, W1, W2, W
2'...Work.

Claims (1)

[Utility Model Claims] 1. A reversing device which supports a shaft perpendicular to the axial direction of a workpiece on a conveying device which is guided by a guiding means and can move linearly, and is provided with a workpiece gripping device at one end of the shaft, a guide arm fixed to the other end of the shaft so as to rotate in conjunction with the shaft and protruding in the radial direction, a cam follower at the tip of the guide arm which engages with a cam groove and is movable and allowed to rotate within the cam groove, and a cam member having a cam groove with a central portion formed in a mountain shape is provided along a surface parallel to the moving direction of the conveying device. 2. A reversing device as described in Utility Model Claim 1, in which a pair of anti-reverse rollers which the tip of the guide arm can enter are pivotally attached above the top of the mountain-shaped cam groove.