JPS5914125Y2 - Work supply/discharge device - Google Patents

Description

[Detailed description of the invention] The present invention allows for simple and quick feeding of unprocessed workpieces and discharge of processed workpieces to a workpiece mounting/removal device equipped with two gripping mechanisms, one for workpiece mounting and one for workpiece removal. The present invention relates to a work supply/discharge device for obtaining workpieces.

For dedicated machines and single-function machines, the loading and unloading of workpieces is automated,
In order to reduce machining man-hours, automatic workpiece mounting/removal devices are often installed.

In this case, supplying the unprocessed workpiece to the workpiece mounting/removal device and discharging the processed workpiece are performed while the workpiece is being cut. The time required for supplying and discharging can be longer, resulting in idle time.

Such idle time is completely wasted time, and it is necessary to prevent this from occurring in order to reduce machining man-hours. To this end, it is necessary to feed and discharge workpieces to and from the mounting/unmounting device as quickly as possible. We must try to do it.

The present invention was developed in response to such demands, and
The gist of this is the first gripping mechanism (loader) that grips the workpiece before processing in the workpiece mounting/removal device.
and a second gripping mechanism (unloader) that grips the processed workpiece, and first and second pressing members each having an abutment surface are provided on an extension of the center line of the gripping part of the second gripping mechanism (unloader), and both pressing members are gripped by the gripping mechanism. By moving in the direction of , the unprocessed workpiece is supplied to the first gripping mechanism, and the processed workpiece held by the second gripping mechanism is discharged.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In Fig. 1, 1 is a base, and a column 2 is erected on the rear upper surface of the base.A headstock 3 is fixed to one side of the front of the column 2, and a Shinshindai 4 is fixed to the other side. There is.

A bracket 5 is protruded from the front of the column 2 below the headstock 3, and a workpiece mounting/removal device 6 is mounted on the top surface of the bracket 5.
is placed.

A horizontal plate 11 is projected from the vertical center of the column 2, and a lifter 7 and a pusher 8 are attached to the horizontal plate 11.

Reference numeral 9 denotes a supply chute for supplying the unprocessed workpiece to the lifter 7 using an inclination, and is installed between the shinshindai 4 and the pusher 8.

Reference numeral 10 denotes a discharge chute for discharging processed workpieces using an inclination, and is installed between the headstock 3 and the workpiece mounting/removal device 6.

Note that the tool and its operating device are omitted in FIG.

A rotation shaft 21 is supported horizontally through the upper part of the base 12 installed on the bracket 5, and is rotated alternately by a constant angle by a drive mechanism (not shown) installed in the base 12. A head 13 is fixed to one end, a box 14 is attached to the other end for relative freedom of rotation, and a guide bar is supported through the lower part of the base 12 in parallel with the rotation axis 21. A box body 14 is fixed to one end of the box body 15, and a screw rod 16, which is rotatably attached to the box body 14, is screwed to the base 12. By manually rotating the screw rod 16, the head 13 is fixed. The installation position can be moved and adjusted.

The structure of the head 13 is shown in detail in FIGS. 2-5.

In FIGS. 2 and 3, a mounting base 22 is attached to the tip of the rotating shaft 21 so as to be rotatable around the axis A, and a mounting base 22 is attached to the side of the mounting base 22 (to the right in FIG. 3). A torque cylinder 23 that reciprocates within a predetermined angle is attached to the drive member 25, which is fixed to the rotation shaft 24 and rotated around the axis B of this shaft.
A pin 26 is fixed by a bolt 27.

A piece 32 is rotatably fitted into the portion of the pin 26 that protrudes from the drive member 25, and is prevented from being pulled out by an annular member 31a and a nut 31b.

A fixed shaft 28 is also fixed to the mounting base 22 so that its axis C is parallel to the axis B of the rotating shaft 24,
One end of a longitudinal driven member 29 is pivotally connected to the fixed shaft 28 .

An elongated engagement hole 30 is provided in the intermediate portion of the driven member 29 in the longitudinal direction of this member, and a piece 32 fitted with the pin 26 is engaged with this engagement hole 30. As a result, the rotation of the drive member 25 about the axis B is converted into the rotation of the driven member 29 about the axis C.

The end of the driven member 29 opposite to the one pivoted to the fixed shaft 28 is provided with two gripping mechanisms 35 and 36 at the tip by an elongated hole 33 and a pin 39 loosely fitted therein. It is connected to a moving member 37.

That is, at the end of the driven member 29, a long hole 33 is provided in the longitudinal direction of this member, similar to the engagement hole 30 in the middle part, and a cylindrical frame fixed to the mounting base 22 is provided. A cylindrical moving member 37 movably slidably fitted into the body 38
A pin 39 is fixed to the movable member 37 in a direction perpendicular to the axis thereof.

A piece 40 rotatably fitted to the pin 39 is engaged with the elongated hole 33, thereby connecting the driven member 29 and the moving member 37 to each other.

Two gripping mechanisms 35 provided at the tip of the moving member 37
．． 36 are fixed claws 35a, 36a and a spring 35b.
, 36b, and movable claws 35C and 536C, one of the gripping mechanisms (lower in FIG. 2) is for gripping the workpiece before processing, and the other gripping mechanism 36 is for gripping the workpiece before processing. This is an unloader for gripping a subsequent workpiece, and the workpiece is supplied and discharged by combining the reciprocating movement of the moving member 37 with the rotational movement of the mounting base 22 about the axis A.

That is, by the rotation of the rotation shaft 21, the head 13 can rotate by a predetermined angle (6 degrees in this case) clockwise and counterclockwise around the axis A from the intermediate position shown in FIG. The workpiece before processing is supplied to the first gripping mechanism 35, and the workpiece after processing is discharged from the second gripping mechanism 36 when the head 13 is rotated most clockwise. When the moving member 37 is in the retracted position (second position), this is done by a button 8 which will be described later.

Further, when the moving member 37 is moved forward with the head 13 in the rotational position, the second gripping mechanism 36 is in a position coaxial with the main shaft 3a of the headstock 3, that is, a chuck position (first position), Next, when the head 13 is rotated counterclockwise, the first gripping mechanism 35 is placed in the chuck position.

Further, when the movable member 37 moves forward and backward, the rollers 42, 43 (see FIG. 4) provided on each gripping mechanism 35, 36 are provided on the tailstock shaft 4a (see FIG. 7) of the center stand 4. contact each cam surface.

When the moving member 37 moves forward, the second gripping mechanism 36
The main shaft 3 resists the elastic force of the spring 44 shown in FIG.
a side (in the direction perpendicular to the plane of the paper in FIG. ) by moving the both armrest mechanism 3
Workpieces are transferred between the 5.36 and the machine tool.

Further, when the moving member 37 moves forward or backward, when the first gripping mechanism 35 or the second gripping mechanism 36 is at a predetermined position, the moving shaft 34 (see FIG. ) the dog 46.47 fixed on the top actuates the limit switch 48.49 and
When the drive member 25 stops, each side of the drive member 25 is attached to the mounting base 22.
It abuts against stoppers 52, 53 fixedly mounted above.

As shown in FIG. 6, the head 13 has a rack 37b formed on a movable member 37a to which the first and second gripping mechanisms 35 and 36 are attached, and the rotation of the torque cylinder 23 is attached to the rack 37b. A gear 370 fixed to the moving shaft 24 may be engaged, and the moving member 37a may be reciprocated by the rotation of the rotating shaft 24. Alternatively, the moving member may be connected to a screw I/rod of an air cylinder or a hydraulic cylinder. It is also possible to fix it to and move it back and forth by expanding and contracting it.

The lifter 7 and bushing 8 are shown in detail in FIG.

In the figure, 55 is a horizontal plate 11 projecting from the column 2.
It is an air cylinder fixed vertically to the air cylinder, and has a lifting platform 57 attached to the tip of its piston rod 56, and a vertical plate 58 equipped with a roller-type work support device 59 on its upper surface, and a spring release protrusion 61. and hook part 60
A horizontal rod 60 with a is fixed.

The lifting table 57 is also fixed to the upper ends of guide bars 64 and 65 that are slidably fitted into guides 62 and 63 that are vertically fixed to the horizontal plate 11 on both sides of the air cylinder 55, and By extension, it rises from the lowest position shown by the solid line in FIG. 7 to the uppermost position shown by the two-dot chain line in FIG. 7, and then lowers by the contraction of the piston rod 56.

The lowermost position of the lifting table 57 corresponds to the end of the supply chute 9 where the workpiece support device 59 is supported by the support rod 69, and the uppermost position corresponds to the end of the feed chute 9 supported by the workpiece support device 59. The previous workpiece W is at a position corresponding to the gripping portion of the first gripping mechanism 35 when the head 13 is rotated clockwise in FIG. 2 and the moving member 37 is retracted.

Two proximity switches 67 and 68 are fixed downwardly on the upper part of the vertical plate 58 by a bracket 66 so as to detect the unprocessed workpiece W supplied from the supply chute 9 onto the workpiece support device 59. It has become.

) A stopper 70 is fixed to a support rod 71 erected on the horizontal plate 11 on the side of the lid 7, and stops the tip of the workpiece W to be processed, which is supplied from the supply chute 9 to the workpiece support device 59. The work W is positioned by abutting against this, and the work W can be detected by a proximity switch 72 mounted horizontally on the stopper 70.

The bushing 8 has the following configuration.

An air cylinder 74 is horizontally attached to the upper part of a bracket 73 erected on the horizontal plate 11, and a first pressing member 77 is attached to the lower part of the mounting plate 76 fixed to the tip of the piston rod 75. A second pressing member 78 is horizontally screwed onto each of the two and fixed by nuts 79 and 80, respectively.

The mounting plate 76 also has a guide bar 81 protruding from its lower part parallel to the piston rod 75, which is slidably fitted into a guide 84 horizontally fixed to the bracket 73.
The piston rod 75 moves only in the horizontal direction by expanding and contracting.

The abutting surface 77a at the tip of the first pressing member 77 corresponds to the rear end of the unprocessed workpiece W supported on the workpiece support device 59 at the uppermost position, and the abutting surface 77a at the tip of the second pressing member 78 The abutment surface 78a is formed by the head 13 of the workpiece mounting/removal device 6 rotating clockwise in FIG.
7 corresponds to the center of the gripping part of the second gripping mechanism 36 in the retracted state.

With the extension of the screw 1 rod 75, the pusher 8 brings the abutment surface 77a of the first pressing member 77 into contact with the rear end of the unprocessed workpiece W lifted by the lifter 7, and holds it against the first gripping mechanism. 35, the abutment surface 78a of the second pressing member 78 is applied to the rear end of the processed workpiece W' held by the second gripping mechanism 36, and the workpiece is discharged. Therefore, in this example,
Although a short bar is used as the first pressing member 77 and a long bar is used as the second pressing member 78, the short bar that is the first pressing member 77 is removed, and the mounting plate 76 is The lower part may be the first pressing member and the front surface may be the abutment surface.

Next, the operation will be explained.

After the second gripping mechanism 36 of the workpiece attachment/removal device 6 takes out the processed workpiece W' from the spindle 3a, the first gripping mechanism 35 attaches the unprocessed workpiece W to the spindle 3a, and cutting is started. Then, as shown in FIG. 8, the head 13 rotates most clockwise and the moving member 37 retreats.

At the same time, the piston rod 56 of the air cylinder 55 of the nofter 7 extends and lifts the lifting table 57, and the unprocessed workpiece W supplied from the supply chute 9 to the workpiece support table 59 is shown in FIG. It is lifted to the position shown by the dotted chain line.

At this time, the spring release protrusion 61 attached to the lifting table 57 comes into contact with the rear part of the movable claw 35C of the first gripping mechanism 35 from below, and as shown in FIG.
This movable claw 35C is pushed open against the elasticity of b.

Next, the piston rod 75 of the air cylinder 74 of the pusher 8 extends, and the first and second pressing members 77, 78
7, the abutment surface 77a of the first pressing member 77 pushes the rear end of the unprocessed workpiece W lifted by the lifter 7, and pushes this into the first position. At the same time as pushing into the gripping mechanism 35, the second suppressing member 7
The abutment surface 78 a of the second gripping mechanism 36 presses the rear end of the processed workpiece W' held by the second gripping mechanism 36 and pushes it onto the discharge chute 10 .

At this time, the gripping mechanisms 35 and 36 receive a pressing force to the left in FIG. 7 due to the frictional force with the workpieces w and w', and the spring 4 that constantly biases the gripping mechanisms 35 and 36 to the right
4. Trying to move to the left against 45, but lifter 7
A hook portion 60a formed at the tip of the horizontal rod 60 engages with the left side surface of the movable claw 35C of the gripping mechanism 35, thereby preventing this leftward movement.

When the operation is completed, the first and second pressing members 77 and 78 return to their original positions due to the contraction of the piston rod 75, and the elevating table 57 of the lifter 7 is also lowered due to the contraction of the piston rod 56.

Therefore, the pressure of the movable claw 35C of the first gripping mechanism 35 by the spring release protrusion 61 is released, the movable claw 35C closes due to the elasticity of the spring 35b, and the unprocessed workpiece W is separated from the fixed claw 35a. grasp between.

When the machining of the workpiece supplied to the chuck position in the previous process is completed, the torque cylinder 23 is activated to rotate the drive member 25 counterclockwise in FIG. 8 around the axis B, and move the moving member 37 forward. (move rightward in Fig. 8).

At this time, the pin 26 of the drive member 25 and the axis B of the rotation shaft 24
When this member is in contact with the stopper 52, the straight line connecting the two lines is almost perpendicular to the longitudinal direction of the engagement hole 30 of the driven member 29. Although it can hardly be rotated in the initial stage, pin 2
As the piece 32 fitted into the fixing shaft 6 engages with a portion of the engagement hole 30 closer to the fixed shaft 28, it is rotated clockwise around the axis C of this shaft.

In this case, the rotational speed of the drive member 29 increases with acceleration,
As shown by the two-dot chain line in FIG. As the angle between the longitudinal direction of the engagement hole 30 and the straight line approaches a right angle again, the angle gradually approaches zero.

After this, the dog 47 on the moving shaft 34 operates the limit switch 49 and the driven member 29 moves to the 1-lux cylinder 23.
At the same time, the side surface of the drive member 25 is brought into contact with the stopper 53 and the rotation of the second drive member 25 is stopped, thereby being stopped in the state shown in FIG.

At this time, the second gripping mechanism 36 assumes a chuck position coaxial with the main shaft 3a of the machine tool, and uses the wedge angle of the claws to push the gripping mechanism apart with the workpiece itself.
Grip the processed workpiece W'.

When the movable member 37 moves forward, the roller 43 simultaneously comes into contact with a cam (not shown) of the tailstock shaft 4a, so the second gripping mechanism 36 resists the elastic force of the spring 44 and moves toward the main shaft 3a side (in the paper of FIG. 9). vertically approaching direction)) is moved (
(Illustrated by the two-dot chain line in Fig. 4).

Subsequently, when the Shinshin shaft 4a is moved backward, the second gripping mechanism 36, which grips the processed workpiece W' by the action of the spring 44, moves toward the Shinshin stand 4 side (in a direction perpendicularly away from the plane of the paper in FIG. 9). The workpiece is removed from the spindle 3a.

Once the processed workpiece W' is removed from the main shaft 3a, the head 13 is rotated upward (counterclockwise in FIG. 9) by 12 degrees around the axis A.

Then, as shown in FIG. 10, the unprocessed workpiece W gripped by the first gripping mechanism 35 is positioned coaxially with the main shaft 3a and the center shaft 4a.

At this point, the heart axis 4 resists the elastic force of the spring 45.
A is moved forward to chuck the workpiece W onto the t-axis 3a.

After chucking the work W to be processed, when the drive member 25 is rotated clockwise in FIG. 10 and the driven member 29 is rotated counterclockwise, the moving member 37 moves forward. is set back in exactly the opposite direction.

Although it is avoided to repeat this process again, the movable member 3
7 is moved quickly on the way, but as it approaches the initial position, the moving speed is gradually reduced, and then the dowel 46 contacts the limit switch 48, and the drive member 25 abuts against the stopper 52, resulting in the movement shown in FIG. It will be stopped at the indicated position.

When the movable member 37 retreats, the first gripping mechanism 35 is removed from the work fixed by the main shaft 3a and the center shaft 4a due to its retreating force, and the roller 42 is moved from the workpiece fixed by the main shaft 3a and the center shaft 4a.
By contacting the cam a, this gripping mechanism is prevented from suddenly moving toward the Shinshindai 4 side by the action of the spring 45.

Thereafter, the head 13 rotates clockwise, and the moving member 37
Each member is returned to its original state as shown in FIG.

During this time, the gate of the supply chute 9 is opened, and the unprocessed workpiece W is carried into the support device 59 of the lifter 7 located at the lower position.

Thus - the cycle is completed.

As clarified by the above explanation, the present invention has a first gripping mechanism that grips the workpiece before processing and a second gripping mechanism that grips the workpiece after processing. First and second pressing members having contact surfaces are provided, and the workpiece to be processed is pushed into the first gripping mechanism by advancing both pressing members, and at the same time, the workpiece after processing is discharged from the second gripping mechanism. As a result, the workpiece before processing can be supplied to the workpiece mounting/removal device and the workpiece after processing can be discharged extremely quickly using the smallest actuator, shortening cycle time and reducing the number of processing steps. be effective.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the present invention, with FIG. 1 being a perspective view showing an overview, FIG. 2 being a partially cutaway front view of the head of the workpiece mounting/removal device, and FIG. 3 being a partially cutaway side view of the main part. Fourth
The figures are a view taken in the direction of arrow III in FIG. 2, FIG. 5 is a sectional view taken along the line IV-IV in FIG. 2, FIG. 6 is a partially cutaway front view of a modified example of the head, and FIG. 8 to 11 are front views of essential parts for explaining the operation of the workpiece mounting/removal device shown in FIG. 2. 6: Workpiece mounting/removal device, 7: Lifter, 8: Pusher, 9: Supply chute, 10: Discharge chute, 1
3: head, 35: first gripping mechanism, 36: second gripping mechanism, 59: workpiece support device, 74: air cylinder,
76: Mounting plate, 77: First pressing member, 78: Second pressing member, 77a, 78a: Abutment surface.

Claims (1)

[Claims for Utility Model Registration] A first gripping mechanism and a second gripping mechanism are arranged in parallel on a movable member to move between a first position and a second position, and in the first position, after processing After the workpiece is removed from the main shaft of the machine tool by the seventh [-4 gripping mechanism, the unprocessed workpiece is attached to the main shaft by the first gripping mechanism, and in the second position, the workpiece after processing is removed from the main shaft of the machine tool by the second gripping mechanism. In the workpiece mounting/removal device, the workpiece is discharged from the workpiece and the unprocessed workpiece is supplied to the first gripping mechanism, wherein the workpiece is abutted on an extension of the center line of the gripping part of the first gripping mechanism in the second position. a second pressing member having an abutting surface on an extension of the center line of the gripping portion of the second gripping mechanism at the same position;
A drive device that integrally advances the second pressing members in the direction of their corresponding gripping mechanisms and then retreats to the original position; a support device for supporting the workpiece;
The workpiece to be processed is pushed into the first gripping mechanism by advancing the pressing member, and at the same time, the workpiece after processing is pushed out from the second gripping mechanism by advancing the second pressing member. A workpiece supply/discharge device to a workpiece mounting/removal device characterized by: