JPH0544030Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is installed in machine tools such as automatic lathes,
This invention relates to improvements to an automatic workpiece insertion device that automatically feeds and inserts workpieces into the chuck of a machine tool.

(Conventional technology) Automatically feeds the workpiece to the chuck of the machine tool,
Automatic workpiece insertion devices have been developed with various structures. As this automatic workpiece inserting device, for example, one disclosed in Japanese Utility Model Publication No. 46-6956 is known.

That is, as shown in FIGS. 4 and 5, the automatic workpiece inserting device includes a slide base 53 and a double rod-shaped cylinder 54 provided on the slide base 53.
, a slide shaft 55 disposed on the slide base 53 so as to be slidable in the vertical direction, and a holding base 56 and a holding tool 57 at the lower end of the slide shaft 55.
A pedestal 59 for a workpiece 58 fixed via a cradle 59 , a horizontal slide shaft 60 horizontally protruding from the holder 56 , a slide guide 61 slidably supported by the horizontal slide shaft 60 , and a holder 56 .
from a compression spring 62 interposed between the slide guide 61 and the slide guide 61, a push plate 64 provided to the slide guide 61 via a push fitting 63, a push arm 65 pivotally attached to the lower end of the slide shaft 55, etc. It is configured.

In FIGS. 4 and 5, 66 is a connecting body that connects the piston rod 67 and the slide shaft 55, 68 is a positioning nut that determines the lower limit position of the slide shaft 55, and 69 is interposed at the upper end of the piston rod 67. pressed spring, 70
71 is a workpiece holding arm that holds the workpiece 58 on the pedestal 59, and 71 is an operating rod of the workpiece holding arm 70.
72 is a chute for transporting the work 58 to the pedestal 59; 73 is a work feed mechanism for sequentially feeding the work 58 to the pedestal 59; and 74 is a chuck of the machine tool.

Therefore, the automatic workpiece insertion device has a pedestal 59.
receives the workpiece 58, the piston rod 67
is lowered, and the slide shaft 55 is also lowered by the same stroke in synchronization with this.

When the piston rod 67 and the slide shaft 55 descend and the axis of the workpiece 58 and the axis of the chuck 74 match, the positioning nut 68 abuts the cylinder case 75, the slide shaft 55 stops descending, and only the piston rod 67 is moved. It further descends by a predetermined stroke.

When only the piston rod 67 descends by a predetermined stroke, its lower end comes into contact with the pushing arm 65, and the pushing arm 65 rotates clockwise as shown in FIG. 60, the pushing plate 64 comes into contact with the workpiece 58 on the pedestal 59 and pushes it into the chuck 74.

When the workpiece 58 is pushed into the chuck 74, the piston rod 67 rises and returns to its initial position, and the other members also return to their initial positions.

In this manner, the workpiece 58 is automatically fed and inserted into the chuck 74.

However, the automatic workpiece inserting device has a pair of horizontal slide shafts 6 in which the slide guides 61 are arranged horizontally and at the left and right positions of the holding table 56.
0, and the slide guide 61 is pushed and moved by a single pushing arm 65, so when the slide guide 61 slides along the horizontal slide shaft 60, it inevitably moves in the front and rear direction. It may move at an angle. As a result, the pushing plate 64 is not parallel to the workpiece 58, but is tilted toward the workpiece 58.
8 and pushes it out, making it impossible to accurately insert the work 58 into the chuck 74.

Further, the slide shaft 55 is held by the slide base 53 so as to be slidable in the vertical direction.
Since its lower end side is held only by the slide base 53, it inevitably wobbles. As a result, when the slide shaft 55 descends to the lower limit position, the workpiece 58 and the chuck 74
It is difficult to match the axes of the workpiece 5 to the chuck 74.
8 becomes even more difficult to insert correctly.

(Problems to be solved by the invention) The present invention was devised to solve the above-mentioned problems, and its purpose is to move the pushing plate parallel to the workpiece, and to move the slide shaft. An object of the present invention is to provide an automatic workpiece inserting device that can prevent sagging.

(Means for Solving the Problems) The automatic workpiece inserting device of the present invention consists of a slide base, a fluid pressure cylinder fixed vertically to the slide base and having both ends of a piston rod protruding from the cylinder case, and a hydraulic cylinder fixed to the slide base in the vertical direction. The slide shaft is arranged to be slidable in the vertical direction and is in parallel with the fluid pressure cylinder, and the piston rod and the slide shaft are provided at the upper ends of the piston rod and the slide shaft to move them up and down in synchronization with the same stroke, and to adjust the lower limit position of the slide shaft. a connecting operation mechanism that lowers only the piston rod by a predetermined stroke; a holding mechanism that is provided on the slide base to slidably hold the slide shaft and prevent it from rattling; and a holding mechanism that is installed at the lower end of the slide shaft. a pedestal on which a workpiece is placed; a plurality of horizontal slide shafts arranged horizontally and vertically at the lower end of the slide shaft; A slide guide that is always energized in the direction of separation, and a slide guide that is attached to the slide guide,
A pushing plate that horizontally pushes the workpiece on the pedestal into the chuck at the opposite position by moving the slide guide toward the slide shaft, and a push plate that is pivotably attached to the lower end of the slide shaft and is attached to the left and right ends of the slide guide. The push-in arm body is always in contact with the piston rod and is rotated in a predetermined direction only when the piston rod is lowered in this state to move the slide guide toward the slide shaft.

(Function) In the automatic workpiece inserting device, when the pedestal receives a workpiece with the piston rod and slide shaft held at the upper limit position, the piston rod and slide shaft synchronize and descend by the same stroke. In addition, the slide shaft is
The holding mechanism prevents rattling when going up and down.

When the piston rod and the slide shaft descend and the axes of the workpiece and the chuck of the machine tool align, the slide shaft stops descending and only the piston rod further descends by a predetermined stroke.

When only the piston rod descends by a predetermined stroke, its lower end comes into contact with the pusher arm body, causing the pusher arm to rotate in a predetermined direction, and in conjunction with this, the slide guide slides in a predetermined direction along the horizontal slide shaft. At the same time, the pushing plate comes into contact with the workpiece on the pedestal and pushes it into the chuck. Note that the slide guide is slidably supported by horizontal slide shafts disposed at upper and lower positions, and when sliding, its left and right ends are pushed by the pushing arm body, so that it moves parallel to the workpiece. As a result, the pushing plate also moves parallel to the workpiece, allowing the workpiece to be inserted into the chuck accurately.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

1 and 2 show an automatic workpiece insertion device according to an embodiment of the present invention, which includes a slide base 1, a fluid pressure cylinder 2, a slide shaft 3, a connection operation mechanism 4, Holding mechanism 5, pedestal 6, horizontal slide shaft 7, slide guide 8, push plate 9, and push arm body 1
It is composed of 0, etc.

The slide base 1 is disposed above a chuck 11 of a machine tool, such as an automatic lathe (not shown).

The fluid pressure cylinder 2 is fixed in the vertical direction of the slide base 1, and is a double rod type cylinder in which both ends of a piston rod 12, that is, the upper and lower ends protrude from a cylinder case 13. Further, a stepped portion 14 is formed at the upper portion of the piston rod 12, and a narrow diameter portion 15 is formed at the upper end thereof. Furthermore, piston rod 1
A pressing metal fitting 16 is fixed to the lower end of 2.

The slide shaft 3 is disposed at a rear position of the fluid pressure cylinder 2 and slidably in the vertical direction on the slide base 1, and is in parallel with the fluid pressure cylinder 2.

The connection operation mechanism 4 is provided at the upper end of the piston rod 12 and the slide shaft 3, and moves both up and down by the same stroke in synchronization.
At the lower limit position of the slide shaft 3, only the piston rod 12 is further lowered by a predetermined stroke.

That is, the connection operation mechanism 4 has one end attached to the upper end of the slide shaft 3 with the stud 17 and the nut 1.
A connecting plate 20 is fixed to the lower surface of the connecting plate 20 and is slidably fitted onto the piston rod 12 through a hole 19 formed in the center thereof. cylindrical part 2
1, and a nut 2 at the upper end of the connecting plate 20 and the narrow diameter part 15.
interposed between the connector 23 fixed by the connector 2,
It is composed of a spring 24 that holds the connecting plate 20 in contact with the stepped part 14, a positioning nut 25 that is screwed onto the outer peripheral surface of the cylindrical part 21, and that comes into contact with the cylinder case 13 when the piston rod 12 is lowered. By adjusting the positioning nut 25, the downward stroke of the slide shaft 3 is adjusted.

The holding mechanism 5 is provided on the slide base 1,
It holds the slide shaft 3 slidably and prevents it from rattling.

That is, as shown in FIG. 3, the holding mechanism 5 includes a pair of left and right stud bolts 2 installed horizontally in the slide base 1 at both sides of the slide shaft 3.
6 and slidably supported by the stud bolt 26,
A holding plate 27 that comes into contact with the slide shaft 3 and holds it slidably between it and the slide base 1
, a receiving metal fitting 29 fixed to the end of the stud bolt 26 with a nut 28 , a holding plate 27 and a receiving metal fitting 2
The compression spring 30 is interposed between the presser plate 27 and the slide shaft 3 to bring the presser plate 27 into contact with the slide shaft 3. Therefore, the slide shaft 3 is
The compression spring 30 causes the slide base 1 to be held between the slide base 1 and the presser plate 27, thereby preventing rattling in the front-back and left-right directions. In this embodiment, the holding mechanism 5 is provided only at the lower position of the slide base 1, but since the upper end of the slide shaft 3 enters the slide base 1 when descending and is connected to the piston rod 12, Since rattling is prevented, it is not necessarily necessary to provide the holding mechanism 5 above the slide base 1.

The pedestal 6 includes a V-shaped locking groove 32 on which the workpiece 31 is placed, and a holder 33 and a holder 34.
It is attached to the lower end of the slide shaft 3 via. Further, the pedestal 6 can be adjusted to move vertically with respect to the holder 34 using bolts 35 or the like.

A workpiece holding arm 36 is swingably supported on the holder 34 by a shaft 37, and the workpiece holding arm 36 can be adjusted vertically. At the upper limit position of the slide shaft 3, the workpiece holding arm 36 has its base end in contact with the operating rod 38 fixed to the slide base 1, and the shaft 37
The tip is rotated upward centering on the workpiece 3.
1 Workpiece 31 is transferred from the chute 39 for transport to the pedestal 6.
When the slide shaft 3 descends, its tip presses the upper surface of the work 31 on the pedestal 6 downward by the force of the tension spring 40, stably placing the work 31 on the pedestal 6. It is something to keep.

A plurality of horizontal slide shafts 7 are arranged horizontally at the lower end of the slide shaft 3 and in vertical positions. In this embodiment, the horizontal slide shaft 7 is a holding base fixed to the back surface of the lower end of the slide shaft 3. 33, projecting horizontally toward the front at the upper front position and the lower front position, respectively.

The slide guide 8 is a horizontal slide shaft 7
It is supported through the slide shaft 3 so as to be slidable in the front-rear direction, and is always urged in a direction away from the slide shaft 3, that is, forward, by a compression spring 41 interposed between the holding base 33 and the slide guide 8.

The pushing plate 9 is attached to the slide guide 8 via a pushing tool 42 at a position in front of the pedestal 6, and faces the workpiece 31 on the pedestal 6. Therefore, when the slide guide 8 moves toward the slide shaft 3, that is, toward the rear, the push plate 9 can push the work 31 on the pedestal 6 into the chuck 11 at the opposite position. In this embodiment, the pushing plate 9 is rotatably supported by the pushing tool 42 via a bearing 43 or the like.

The push arm body 10 is connected to the slide shaft 3
It is pivotally attached to the lower end of the piston rod 12 so as to be able to swing forward and backward, and it constantly contacts the left and right ends of the front surface of the slide guide 8, and in this state, it only contacts this and rotates rearward when the piston rod 12 is lowered. This is to move the slide guide 8 toward the slide shaft 3 side.

That is, the push-in arm body 10 is pivotally attached to an arm cradle 44 fixed to the front surface of the lower end of the slide guide 8 so as to be slidable in the front and rear direction by a shaft 45.
A base end 46 which is pivotally connected to the piston rod 12 and comes into contact with the lower end of the piston rod 12, that is, the press fitting 16;
6, and a pair of left and right arm pieces 47 distributed evenly to the left and right around the horizontal slide shaft 7.
The roller 48 is rotatably supported by each arm piece 47, and is always in contact with the front left and right ends of the slide guide 8.

1 and 2, 49 is a working fluid supply port, 50 is a limit switch operating rod attached to the connecting fitting 23, 51 is a stopper of the work holding arm 36, and 52 is attached to the push plate 9. It is a vibration sensor.

Next, the operation of the automatic workpiece feeding device will be described.

Initially, the piston rod 12 and the slide shaft 3 are held at the upper limit position. At this time,
The base end of the workpiece holding arm 36 abuts the operating rod 38, and the distal end thereof is rotated upward. Therefore, the pedestal 6 can receive the workpiece 31 from the chute 39.

When the receiving stand 6 receives one workpiece 31 from the chute 39, the supply port 4 above the cylinder case 13 is opened.
Fluid is supplied to the piston rod 9, and the piston rod 12 is lowered, and in conjunction with this, the slide shaft 3 is also lowered by the same stroke in synchronization with the piston rod 12 by the connecting operation mechanism 4. Furthermore, when the slide shaft 3 is lowered, the work holding arm 36 and the operating rod 3
8 are separated from each other, the work 31 on the pedestal 6 is held under pressure by the work holding arm 36. Further, the slide shaft 3 is prevented from rattling by the holding mechanism 5.

When the piston rod 12 and slide shaft 3 are lowered and the axes of the workpiece 31 and chuck 11 are aligned, the positioning nut 25 is attached to the cylinder case 13.
The slide shaft 3 stops descending upon contact with the upper end surface, and only the piston rod 12 is supported by the spring 2.
4 and further descends by a predetermined stroke.

When only the piston rod 12 is lowered by a predetermined stroke, its lower end is pushed into the arm body 10.
The pushing arm body 10 rotates rearward as it comes into contact with the slide guide 8, and the slide guide 8 slides backward along the horizontal slide shaft 7, and the pushing plate 9 touches the workpiece 31 on the pedestal 6. abut it and push it into the chuck 11. The slide guide 8 is slidably supported by a pair of upper and lower horizontal slide shafts 7, and when moving, its front left and right ends are pushed by the pushing arm body 10, so that it moves parallel to the workpiece 31. As a result, the pushing plate 9 also moves parallel to the workpiece 31, and the workpiece 31 can be inserted into the chuck 11 accurately.

When the piston rod 12 is lowered to a position where the workpiece 31 is fully pushed into the chuck 11,
The limit switch operating rod 50 comes into contact with a limit switch (not shown) for starting the upward movement, and the piston rod 12 stops descending and then begins to rise. Along with this, the slide guide 8 is moved by the compression spring 4.
1, the slide shaft 3 is also moved forward by the connecting operation mechanism 4, and the piston rod 12 is moved forward.
It rises in synchronization with and returns to the initial position.

Note that the structure of the holding mechanism 5 is not limited to that of the above embodiment, and the structure of the holding mechanism 5 is not limited to that of the above embodiment.
Any structure may be used as long as it can prevent rattling when moving up and down.

Further, the structure of the pushing arm body 10 is not limited to that of the above embodiment; it is pivotally attached to the slide shaft 3 so as to be able to swing freely, and is always in contact with the left and right ends of the slide guide 8. Any configuration and shape may be used as long as the slide guide 8 can be moved by rotating in a predetermined direction when the slide guide 12 is lowered.

(Effects of the invention) As mentioned above, the automatic workpiece insertion device of the invention has the following advantages:
A horizontal slide shaft is arranged at the lower end of the slide shaft in a horizontal state and in vertical positions, and a slide guide provided with a push plate is slidably supported on the horizontal slide shaft, and the left and right ends of the slide guide are arranged at the lower end of the slide shaft. A push-in arm body that is always in contact with the workpiece is swingably provided, and the push-in arm body pushes several parts of the slide guide to move it, so the slide shaft and push-in plate are always attached to the workpiece without tilting. Move horizontally parallel to the other side. As a result, the workpiece can be accurately inserted into the chuck in a constant posture at all times, and the accuracy of machining such as cutting can be improved.

Furthermore, since a holding mechanism is provided to slidably hold the slide shaft, the slide shaft moves up and down smoothly without rattling. As a result, when the slide shaft descends to the lower limit position, the workpiece on the pedestal installed at the lower end of the slideshaft and the axis of the chuck of the machine tool are accurately aligned, making it easy to insert the workpiece into the chuck. Can be done accurately.

[Brief explanation of the drawing]

FIG. 1 is a front view of an automatic workpiece insertion device according to an embodiment of the present invention, FIG. 2 is a partially cutaway side view,
3 is a sectional view taken along the line -- in FIG. 2, FIG. 4 is a front view of the conventional automatic workpiece inserting device, and FIG. 5 is a side view of the same. 1 is a slide base, 2 is a fluid pressure cylinder, 3
is a slide shaft, 4 is a connection operation mechanism, 5 is a holding mechanism, 6 is a pedestal, 7 is a horizontal slide shaft,
8 is a slide guide, 9 is a pushing plate, 10 is a pushing arm body, 11 is a chuck, 12 is a piston rod, 13 is a cylinder case, and 31 is a workpiece.

Claims (1)

[Scope of utility model registration request] a slide base 1; and a fluid pressure cylinder 12 that is vertically fixed to the slide base 1 and has both ends of a piston rod 12 protruding from a cylinder case 13.
A slide shaft 3 is disposed on the slide base 1 so as to be slidable in the vertical direction and is in parallel with the fluid pressure cylinder 2, and a piston rod 12 and a slide shaft 3 are disposed at the upper ends of the slide shaft 3 and synchronized by the same stroke. At the same time, the piston rod 12 is raised and lowered at the lower limit position of the slide shaft 3.
A connecting operation mechanism 4 that further lowers the shaft by a predetermined stroke, and a metal holding plate 27 that is provided at the lower end of the slide base 1 and biases the slide shaft 3 by the slide base 1 and the spring 30.
a holding mechanism 5 that slidably holds the workpiece 31 and prevents it from wobbling; a pedestal 6 that is attached to the lower end of the slide shaft 3 and on which the workpiece 31 is placed;
A plurality of horizontal slide shafts 7 are disposed horizontally at the lower end of the slide shaft 3 in vertical positions, and the slide shaft 7 is slidably supported by the horizontal slide shaft 7 and is always biased in a direction away from the slide shaft 3. a push plate 9 which is attached to the slide guide 8 and which pushes the workpiece 31 on the pedestal 6 horizontally into the chuck 11 at the opposite position by moving the slide guide 8 toward the slide shaft 3; Rollers 48, 48 are pivotably mounted on the lower end of the shaft 3 and are pivotally supported at their tips at the left and right ends of the slide guide 8.
The pushing arm body 10 is always in contact with the slide guide 8, and in this state, only when the piston rod 12 is lowered, the push arm body 10 comes into contact with the center part of the slide guide 8 and is rotated in a predetermined direction to move it toward the slide shaft 3 side. Automatic workpiece inserting device featuring: