JPH0112602B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lathe having two spindle chucks and a loader for receiving and delivering a workpiece between the two spindle chucks, and a method for receiving and delivering a workpiece in the lathe. .

The lathe shown in FIG. 1 is a lathe that has two main spindles and can machine the front and back sides of a workpiece in one cycle.

In other words, this lathe has two spindle chucks 1,
2, a loader 5 in which an X-shaped swing arm 4 is supported by a shaft 3 which is rotatable and movable back and forth and which is provided above the main shaft chucks 1 and 2, and a fixed chuck which is provided above the loader 5. 6 and a turning chuck 7 that rotates around a vertical axis; and a turret tool post 9 that is movable in the XX' and YY' axes directions provided in front of each of the spindle chucks 1 and 2. , 10, and loader chucks 11, 12, 13, and 14 are provided at the four ends of the swing arm 4, respectively. The workpiece W is sequentially loaded onto the two main spindles 1 and 2 in the following manner, subjected to turning processing, and sent out to the delivery chute 16.

That is, as shown in FIG. 2, the loader 5 is first moved backward to load the unprocessed material work Wp onto the loader chuck 11 of the swing arm 4 (FIG. 2A).

At this time, spindle chucks 1 and 2 contain a semi-machined workpiece Wq that has already been turned in the previous machining cycle, that is, a workpiece Wq that has only the front surface machined, and a fully machined workpiece Wr, that is, a workpiece Wr whose back surface has also been machined. Being checked.

A semi-finished workpiece Wq whose surface has been machined in the previous machining cycle and which has been turned over by the front-back reversing device 8 is chucked on the stationary chuck 6. Next, the loader 5 is moved forward and rotated 90 degrees in the direction of the arrow to bring the loader 5 into the state shown in FIG. ，
In addition to receiving Wr, the semi-finished work Wq on the reversing device 8 is also received by the loader chuck 12 (FIG. 2B).

In the above condition, loader chuck 11, 12, 1
3, 14 all have workpieces Wp, Wq, Wq, Wr
is checked and main shaft chucks 1 and 2 are empty, so next move the loader 5 in the direction of the arrow.
Rotate it 180 degrees to get the state shown in Figure 2 (c).

In this state, the loader 5 is moved backward and the unprocessed work Wp and semi-processed work Wq on the loader chucks 11 and 12 are transferred to the empty spindle chucks 1 and 2.
At the same time, the unprocessed workpiece Wq on the loader chuck 13 is transferred onto the turning chuck 7 of the reversing device 8 (FIG. 2C).

Therefore, while all the processed workpieces Wr are chucked on the loader chuck 14, the loader 5 is then rotated 90 degrees in the direction of the arrow to achieve the state shown in FIG. At the same time, the empty loader chuck 11 receives the unprocessed workpiece Wp on the carry-in chute 15, and at the same time rotates the spindles 1 and 2 to load the workpiece.
Start turning Wp and Wq (Fig. 2 D).

At this time, the reversing device 8 is operated to transfer the semi-processed workpiece Wq to the fixed chuck 6 side so that the back side of the workpiece Wq faces forward.

The lathe shown in Fig. 1 is constructed as described above, but because the swing arm 4 of the loader 5 is X-shaped, this lathe has the following various drawbacks and inconveniences. .

That is, since the swing arm 4 is spread out in all directions, the occupied space S1 when the loader 5 moves back and forth is
(dashed line in Figure 1) is large, especially the spindle chuck 1,
2 and the turret tool rests 9 and 10 occupy a large proportion of the space below, and the layout of the device in the lower part was severely restricted.

That is, in general, if the turret tool rests 9 and 10 are installed in an inclined position, as shown in Fig. 1, the chips that accumulate on them will naturally collect on one lower side, compared to when they are installed horizontally. However, in the lathe shown in FIG. 1, since the space S1 occupied by the loader 5 during movement is particularly large in the downward direction, the turret tool rests 9 and 10 are not properly arranged. If the turret tool rests 9 and 10 cannot be installed at a large slope and are installed at such an angle that the chips that accumulate on them will naturally slide down, the space occupied during movement of the turret tool rests 9 and 10 will be limited to the movement of the loader 5. In order to partially intersect with the time-occupied space S1,
The movement of the loader 5 and the movement of the turret tool rests 9 and 10 must always be interlocked, which is an inconvenience. In Figure 2), the following time loss occurred.

That is, in the state shown in FIG. 2D as described above, the spindle chucks 1 and 2 start rotating, and the turret tool rests 9 and 10 move backward along the Y and Y' axes directions, so that the spindle chucks 1 and 2 start rotating. Turning is started on the workpieces Wp and Wq checked in step 2. However, if the space occupied by the loader 5 during movement S1 and the space occupied during movement by the turret tool rests 9 and 10 intersect, the turret tool rests 9, 10 indicates two swing arms (second
Until the spindle chucks 12 and 13 (corresponding to the spindle chucks 12 and 13 in the case of Fig. Although the workpieces Wp and Wq are already loaded in the chucks 1 and 2 so that they can be machined at any time, the turret turrets 9 and 10 cannot advance immediately, so the loader 5 cannot be moved backwards. The turning start time was delayed by the required time, and this time became a completely wasted waiting time in the machining cycle.

In addition, when the above-mentioned lathe does not process both the front and back sides of the workpiece, that is, when only the front side of the workpiece is processed, the front and back reversing device 8 is not provided, and the loading chute 15
As shown in Fig. 3 A and B, the workpiece Wp sent in is sequentially loaded onto one set of bifurcated arms (chucks 11 and 12 in Fig. 3) by rotating the loader 5. If the two workpieces Wp and Wp are loaded onto the spindle chucks 1 and 2 in the same manner as shown in FIG.
It is convenient to be able to load WP,
In the state shown in Figure 3B, the arm end of the other set is
In the case shown in the figure, the chuck 13 intersects with the turret tool post 10 or the spindle chuck 2 as described above, so that the workpiece can be transferred to the bifurcated arm of one set.
Turning could not be started while Wp was being loaded.

In order to avoid this inconvenience, two loading chute 15 and two unloading chute 16 are provided as shown in FIG.
The only option was to carry in and out the work W at step 6, but in that case, chute 15,
16 are required, resulting in high cost.

This invention aims to eliminate the above-mentioned drawbacks and inconveniences of lathes, and embodiments thereof will be described below.

FIG. 4 is a perspective view of a lathe according to the present invention, which has two spindle chucks 2 and 3, like the lathe described above.
1 and 22, a loader 25 in which a swing arm 24 is supported by a shaft 23 which is rotatable and movable back and forth, which is provided above the two main shaft chucks 21 and 22, and a fixed chuck which is provided above the loader 25. 26 and a rotating chuck 27 that rotates around the vertical axis.
and a workpiece reversing device 28, which is provided in front of each of the spindle chucks 21 and 22.
Turret turret 2 movable in XX′ axis YY′ axis direction
The details of the loader 25 and the front/back reversing device 28 are as follows.

That is, as shown in FIG. 5, the shaft 23 of the loader 25 has a spline 35 at its rear end.
A rotary cylinder 37 having a worm wheel 36 is engaged with the spline 35, and is supported by a housing 38 via the rotary cylinder 37.The worm wheel 36 is connected to a servo motor 39.
The worm gear 41 connected to the
The rotation of the servo motor 39 causes the shaft 23 to rotate via the rotary cylinder 37.

Further, an arm plate 43 is provided on the boss 42 fixed to the shaft 23 so as to be rotatable with respect to the boss 42, and a ball screw 44 is screwed onto the tip of the arm plate 43. And this shaft 23
is the servo motor 4 connected to the ball screw 44.
By rotating the arm plate 5, the ball screw 44 rotates and the arm plate 43 moves back and forth.

The shaft 23 of the loader 25 is driven back and forth and in the rotational direction as described above, and next, the swing arm 24 fixed to the tip of the shaft 23
Explain.

Similar to the lathe shown in FIG. 1, the swing arm 24 of this lathe has loader chucks 31, 32, 33, and 34 provided at its tip so that two workpieces W can be delivered to the spindle chucks 21 and 22 at the same time. It consists of two sets of bifurcated arms that are open at an angle that allows them to overlap the main shaft chucks 21 and 22.
It is not in a symmetrical position around 3, that is,
Rather than having a letter-like shape, the two sets of arms are arranged so that the angle α between them is particularly acute as shown below, and is fixed to the shaft 23.

That is, when the swing arm 24 is in the vertical direction, the angle α is the angle between the loader chuck 32 of one set of arms and the loader chuck 33 of the other set of arms.
is the fixing chuck 2 of the workpiece front-back reversing device 28.
6 and the swing chuck 27 (FIG. 4).

The positions of the main shaft chucks 21 and 22 in this example are such that the opening angle β around the shaft 23 is set to 45 degrees, and the fixed chuck 2 of the reversing device 28 is
6. Since the opening angle of the swing chuck 27 around the shaft 33 is similarly set to 45 degrees, the swing arm 24 is ultimately shaped like a palm consisting of four arms that are open at 45 degrees to each other. Therefore,
This loader 25 has a rotating arm 2 shown in FIG.
The space occupied by the loader chuck 31 and the loader chuck 3 is small when the loader chuck 4 moves back and forth with the loader chuck 3 facing upward (dashed line in Fig. 4).
The angles formed by the two sides are approximately 225 degrees and more than 180 degrees, creating a large free space.

As shown in FIG.
6 and the turning chuck 27 are provided so that the angle α formed with the shaft 23 as the center is an angle of 45 degrees, and the turning chuck 27 has its rotation axis 46 in the vertical direction with respect to the frame 50 of the flipping device 28. It is configured to rotate around a vertical axis by a hydraulic motor 47 provided toward the direction. Reference numeral 48 denotes a support arm of the swing chuck 27, and the support arm 48 is provided with a dovetail groove 49 connecting portion so that the swing chuck 27 can be moved back and forth relative to the support arm 48 to adjust its position. be.

Support plate 51 and frame 50 of fixed chuck 26
The frame 50 is also connected by a dovetail groove 52, so that the position of the fixing chuck 26 in the longitudinal direction relative to the frame 50 can be adjusted in the same manner.

Further, the frame 50 also consists of a base part 50a and a slide part 50b connected to the upper part thereof by a dovetail groove 53, so that the position of the swing chuck 27 including the hydraulic motor 47 as a whole can be adjusted back and forth. There is.

Reference numerals 55 and 56 are chutes for loading and unloading the work W, respectively, and 57 and 58 are chutes for transferring and receiving the work W between the chute 55 and 56 and the loader chucks 31, 32, 33, and 34 of the loader 25. This is a device for transferring and receiving work.

Next, a method of machining a workpiece using this lathe will be explained.

The process of machining the front and back sides of the workpiece W in one cycle using the workpiece front-back reversing device 28 is shown in FIG. An unprocessed workpiece Wp is simultaneously loaded onto the loader chucks 31 and 32 from the carrying chute 55, and a partially processed workpiece Wq is simultaneously loaded from the fixed chuck 26 of the front-back reversing device 28 (FIG. 7A).

Semi-processed workpiece Wq on the fixed chuck 26 above
has already had its surface turned in the previous machining cycle and has been turned over by the front-back reversing device 28 so that its back surface faces forward.

The semi-finished workpiece before turning is placed on the turning chuck 27.
Wq is checked.

At this time, the spindle chucks 21 and 22 contain semi-processing material workpieces that have already been turned in the previous machining cycle.
Wq, that is, a workpiece Wq whose surface has been machined only, and a fully machined workpiece Wr, that is, a workpiece Wr whose back surface has also been machined are checked.

Next, the loader 25 is moved forward and rotated approximately 135 degrees in the direction of the arrow to move the loader 25 to the seventh position.
The loader chuck 3 of the other set is not in the state shown in Figure B.
3 and 34, the workpieces Wq and Wr chucked on the spindle chucks 21 and 22 are received (7th
Figure b).

At this time, the turning chuck 27 is turned, and the semi-finished workpiece Wq, whose surface is facing forward, is transferred to the fixed chuck 26 side and turned over.

In the above condition, loader chuck 31, 32, 3
All works Wp, Wq, Wq, Wr are on 3 and 34.
is checked and the main shaft chucks 21 and 22 are empty, so next move the loader 25 in the direction of the arrow about 90 degrees.
Rotate it once until it is in the state shown in Figure 7 (c).

In this state, the loader 25 is moved backward and the unprocessed work Wp and semi-processed work Wq on the loader chucks 31 and 32 are transferred to the empty spindle chuck 2.
2 and 21 (Fig. 7 C).

Next, when the loader 25 is rotated approximately 135 degrees in the direction of the arrow and the loader 25 is directed directly upward again, the loader chucks 31 and 32 of one set of arms are not loaded with the workpiece, and the loader chucks of the other set are not loaded. Since the semi-processed workpiece Wq and the processed workpiece Wr are loaded in 33 and 34, the processed workpiece Wr is transferred onto the carry-out chute 56, and the semi-processed workpiece Wq is transferred onto the turning chuck 27 of the reversing device 28. If you hand it over (Figure 7 D),
One cycle is completed.

In the lathe of the present invention, the swing arm 24 of the loader 25 is not X-shaped as described above.
Workpiece chucked on spindle chucks 21 and 22
Wp and Wq are determined when the arm 24 of the loader 25 rotates and reaches the standby position shown in FIG.
22 is rotated, the turret tool rests 29 and 30 are brought closer to the spindle chucks 21 and 22, and turning can be started.

That is, in the lathe shown in FIG.
After the state changes from C to D in Figure 2, the loader 5
It was not possible to bring the turret tool rests 9, 10 closer to the spindle chucks 1, 2 and start turning until the turret tool rests 9, 10 in front of them retreated to the rear position where they would not interfere. In a lathe, the loader 25 is not X-shaped, so as soon as the loader 25 changes to the state shown in FIG. However, regardless of this, the turret tool rests 29, 30 can be brought closer to the spindle chucks 21, 22 completely freely.

In other words, machining can be started without the above-mentioned waiting time.

In addition, in the lathe shown in Fig. 1, the spindle chucks 1 and 2 and the loader 5 are
Since the transfer of the workpiece between the reversing device 8 and the loader 5 is performed simultaneously, the reversing device 8 and the spindle chucks 1 and 2 are always in the same vertical plane. (Fig. 8 A) However, in this lathe, as shown in Fig. 7 A to C, the loader chuck 3 of one set of arms is
Since the process of loading the workpiece onto the spindle chucks 21, 22 and the process of loading the workpiece onto the spindle chucks 21, 22 are separate processes, the front/back reversing device 28 and the spindle chucks 21, 22 do not necessarily have to be on the same plane ( Figure 8b), front-back reversing device 28
can be provided at the rear of the main shaft chucks 21, 22, so as shown in FIG.
22, fixed chuck 26, and rotating chuck 27
In addition, the fixed chuck 26 and the rotating chuck 27 can be placed on the back side of the spindle chucks 21, 22, thereby allowing the spindle chucks 21, 22 to separate the workpiece from the work being turned. It is possible to reduce the amount of chips generated and scattered mainly in the forward and vertical directions that adhere to the fixed chuck 26 and the rotating chuck 27.

Furthermore, in the lathe of the present invention, if the spacing between the spindle chucks 21 and 22 is wide as shown in FIG. 9 in order to handle a large-diameter workpiece W, if an X-shaped loader 5 is used. , the opening angle of the two prongs of the bifurcated arm becomes too large, for example, the loader becomes a cross-shaped arm, which becomes bulkier and occupies an extremely large space when turning and moving back and forth, which is extremely inconvenient. However, the entire loader 25 can be made compact by arranging the two sets of bifurcated arms so as to overlap each other and cross each other (FIG. 9).

That is, in FIG. 9, the opening angle of the main shaft chucks 21 and 22 about the shaft 23 is 90 degrees, but the opening angle of the fixed chuck 26 and the swivel chuck 27 of the reversing device 28 about the shaft 23 is 90 degrees.
45 degrees, and the swivel arm 24 has an angle δ of 45 degrees formed by the overlapping portions of its forked arms.
It is shaped like a regular palm.

That is, one set of bifurcated arms has loader chucks 31, 32, and the other set of bifurcated arms has loader chucks 33, 34.

Therefore, even though the opening angle of the main shaft chucks 21 and 22 with respect to the shaft 23 is twice as wide as that shown in FIG. 7, the loader 25 is made compact and has almost the same shape. There is.

In the case of the example shown in FIG.
7 is provided in the opposite position, and the following processing steps are performed.

That is, first, two of one set of the swing arms 24 are
Further, the loader chucks 31 and 32 of the arm are loaded with an unprocessed workpiece Wp from the carry-in chute 55 and a semi-processed workpiece Wq from the fixed chuck 26 of the front-back reversing device 28 at the same time (9th
Figure A). Semi-finished workpiece on fixed chuck 26
The surface of Wq has already been turned by turning in the previous machining cycle and has been turned over by the front-back reversing device 28.

The semi-finished workpiece before turning is placed on the turning chuck 27.
Wq is checked.

At this time, the spindle chucks 21 and 22 have semi-machined workpieces that have already been turned in the previous machining cycle.
Wq and fully machined workpiece Wr are checked.

Next, the spindle chucks 21, 2 are rotated in the direction of the arrow to bring them into the state shown in FIG.
Receive the workpieces Wq and Wr checked in step 2 (Figure 9b).

At this time, the turning chuck 27 is turned, and the semi-finished workpiece Wq is transferred to the fixed chuck 26 side and reversed.

In the above condition, loader chuck 31, 32, 3
All works Wp, Wq, Wq, Wr are on 3 and 34.
is checked and the spindle chucks 21 and 22 are empty. Next, the loader 25 is rotated in the direction of the arrow to bring it to the state shown in FIG. Place the completed workpiece Wq into the empty spindle chuck 2.
1 and 22 (Figure 9 C).

Next, when the loader 25 is rotated in the direction of the arrow and the loader 25 is directed directly upward again, one set of loader chucks 31, 32 is not loaded with the workpiece, and the other set of loader chucks 33,
34 shows the semi-machined workpiece Wq and the completed machining workpiece Wr.
is being loaded, so the machining completed workpiece
One cycle is completed when Wr is transferred onto the carry-out chute 56 and the semi-finished workpiece Wq is transferred onto the turning chuck 27 of the reversing device 28 (FIG. 9D).

As described above, the above-mentioned method of machining both the front and back sides of a workpiece in one cycle using the front-back reversing device 28 has the advantage that, in addition to the above-mentioned advantages, the rotating direction of the swing arm 24 of the loader 25 is unidirectional. , a motor 39 that rotationally drives the loader shaft 23 described above.
It has the advantage that it may be a unidirectional motor, and the cost is reduced accordingly.

Next, a case in which only one side of the workpiece is machined using this lathe method will be described.

Since only one side of the workpiece is processed, a front-back reversing device is not used, and the result is as shown in FIG.

Figure 10A shows unprocessed workpieces already placed on the loader chucks 31 and 32 of one set of two-pronged arms.
This shows the state where Wp and Wp are loaded. In this state, the workpieces Wr and Wr machined in the previous cycle are chucked on the spindle chucks 21 and 22.

Next, the loader 25 is rotated in the direction of the arrow, the loader chucks 33 and 34 of the other set of arms are stacked on the main shaft chucks 21 and 22, and the main shaft chucks 2
The machined workpieces Wr and Wr on 1 and 22 are received onto the loader chucks 33 and 34 of the other set, and the spindle chucks 21 and 22 are emptied (FIG. 10B).

Then, the loader 25 is further turned in the direction of the arrow so that one set of loader chucks 31 and 32 overlaps the main spindle chucks 21 and 22, and the unprocessed workpieces Wp and Wp thereon are placed in the empty main spindle chuck. 21 and 22 (Figure 10c).

In this state, the processed workpieces are placed on the loader 25 and the loader chucks 33 and 34 of the other arm, respectively.
Since Wr and Wr have been loaded, the loader 25 is rotated in the direction of the arrow to point directly upward again, and the processed workpiece Wr on the loader chuck 34 is delivered onto the carry-out chute 56 and carried onto the loader chuck 31. The unprocessed workpiece Wp is loaded from above the chute 55 (Fig. 10D).

After this, turning can be performed by rotating the spindle chucks 21 and 22.

Next, the loader 25 is further rotated to transfer the processed workpiece Wr on the loader chuck 33 onto the unloading chute 56 (FIG. 10E).Finally, the loader 25 is rotated in the opposite direction this time to transfer the processed workpiece Wr on the loader chuck 33 onto the unloading chute 56 (FIG. 10E).
In the state shown in Figure 0, the unprocessed workpiece Wp is loaded onto the loader chuck 32 from the loading chute 55 (see Figure 10).

In this state, the unprocessed workpieces Wp and Wp are loaded on one set of arms, respectively, and nothing is loaded on the other set of arms, so the loader 25 is rotated clockwise in the figure again. Then, return to the initial state shown in Figure 10A to complete one cycle.

The workpieces on the spindle chucks 21 and 22 are turned and turned into processed workpieces Wr and Wr.

As is clear from the above description of the machining process, the lathe of the present invention has a workpiece loading and unloading chute 5.
Even if there is only one 5, 56, since the swing arm is not X-shaped, the arm and the turret tool rest 9, 10 or the spindle chuck 1, 2 may interfere with each other as shown in Fig. 3 (b). The condition does not occur.

Therefore, the workpiece loading and unloading chute 5
5 and 56 are required, which reduces the cost accordingly, and also allows the loader 25 to simply rotate by using the equipment used in the method shown in FIGS. By simply changing the angle, rotation order, etc., it can be used for machining only one side of a workpiece.

As is clear from the above description, in the lathe of the present invention, the loader chuck has a swing arm consisting of two sets of bifurcated arms that are opened at an angle that overlaps the positions of the two spindle chucks, and the two sets of bifurcated arms are The shaped arms are not in symmetrical positions with respect to the shaft, that is, they are not in an , the waiting time mentioned at the beginning is omitted and the cycle time is shortened.

Furthermore, since the lathe of the present invention is equipped with a workpiece reversing device above the loader that matches the shape of the loader, the layout of the turret can be freely arranged and waiting time can be eliminated. In addition, once a workpiece has been carried into the lathe using the carry-in chute, it can be machined using the above-mentioned loader by turning the workpiece upside down before being transferred to the carry-out chute, allowing all machining to be carried out within one lathe. can be finished with,
In addition, it becomes possible to receive and deliver workpieces to and from the loader chucks at the ends of the bifurcated arms in each set in separate steps (the method described in claim 2).

In addition, in this method of receiving and delivering workpieces using a lathe, the delivery and receipt of workpieces to the loader are always performed in separate processes for each set of forked arms (Fig. 7 A, B, and C), and as shown in Fig. 1. As shown in the lathe shown in Figure 2, the workpieces are not transferred and received in the same process using two sets of bifurcated arms (Fig. 2C), so the position of the spindle chuck and the position of the flipping device must be aligned within the same plane. There is no need to move the front-side reversing device backwards with respect to the plane of the spindle chuck (No. 8).
Figure B) can reduce the amount of chips generated during cutting that adhere to the reversing device, resulting in defects caused by chips intervening when the workpiece is transferred to each chuck of the reversing device. It is possible to reduce the number of chuck conditions as much as possible.

Furthermore, in this method of receiving and delivering workpieces using a lathe, the workpieces are individually loaded from one chute to one set of bifurcated arms, and the two machined workpieces chucked on the spindle chuck are transferred to the other set of bifurcated arms. Simultaneously loading the sets of bifurcated arms and emptying the spindle chucks simultaneously,
The unprocessed workpieces loaded on one set of forked arms are simultaneously delivered to the empty spindle chuck, and the two processed workpieces loaded on the other set of forked arms are carried out as one. Since the workpieces are carried out to a chute, two workpieces can be handled at the same time even if there is one carry-in chute and one carry-out chute, which is extremely efficient.

[Brief explanation of drawings]

FIG. 1 is an overall perspective view of a lathe having an X-shaped loader arm, FIG. 2 is an explanatory diagram showing a method of machining a workpiece using the lathe, and FIG. 3 is an explanatory diagram showing a method of loading a workpiece using the lathe. , FIG. 4 is an overall perspective view of a lathe according to the present invention,
FIG. 5 is a longitudinal side view showing the structure of the loader, FIG. 6 is a front view showing the relationship between the loader and the workpiece reversing device, FIG. Fig. 8 is a schematic side view showing the positional relationship between the spindle chuck and the workpiece reversing device, Fig. 9 is an explanatory diagram showing a method of machining a workpiece using the lathe of the present invention, and Fig. 10 is a diagram showing the machining method of a workpiece using the lathe of the present invention. It is an explanatory view showing a processing method (single-sided processing). 21, 22...Main shaft chuck, 23...Shaft,
24...Swivel arm, 25...Loader, 28...Workpiece front/back reversing device, 31, 32, 33, 34...Loader chuck, 55...Carry-in chute, 56...Carry-out chute.

Claims (1)

[Scope of Claims] 1. A loader comprising two main shaft chucks, a swing arm supported above the two main shaft chucks by a shaft that is rotatable and movable back and forth, and a fixing member provided above the loader. The lathe is equipped with a workpiece reversing device consisting of a chuck and a swivel chuck that rotates around a vertical axis, and the swivel arm opens at an angle β such that a loader chuck provided at its tip overlaps the position of the two main shaft chucks. The two sets of forked arms are supported by the shaft at positions deviating from each other in symmetrical positions with respect to the shaft, and the two sets of forked arms are Among the total of four loader chucks at the tip of the arm, the opening angle α of the two loader chucks, one in each group, which are close to each other, with respect to the shaft is such that the two loader chucks are fixed to the turning device for the workpiece. A lathe characterized by being set at an angle that overlaps the chuck and the turning chuck. 2. It has two main shaft chucks and a loader above the two main shaft chucks, in which a swing arm is supported by a shaft that can freely rotate and move back and forth,
The above-mentioned swing arm is composed of two sets of forked arms that are opened at an angle such that a loader chuck provided at the tip thereof overlaps with the position of the two main shaft chucks, and the two sets of forked arms are symmetrical with respect to the shaft. A method for receiving and delivering a workpiece in a lathe supported by a shaft at a position other than the position of the spindle chuck, wherein an unprocessed workpiece and a semi-finished workpiece are placed on one set of bifurcated arms at a position above the two spindle chucks. The first step is to load the machining workpiece at the same time.
a second process in which the machined workpiece and the semi-processed workpiece chucked in the spindle chuck are simultaneously loaded onto the other set of bifurcated arms to empty the spindle chuck; and a second process in which the spindle chuck is empty. a third step of simultaneously transferring and loading the unprocessed workpiece and the semi-processed workpiece loaded on the forked arm to an empty spindle chuck; and the processed workpiece loaded on the other set of the bifurcated arm. A method for receiving and delivering a workpiece in a lathe, comprising a fourth step of transporting a semi-processed workpiece to a carry-out path and loading the semi-processed workpiece to a workpiece reversing device. 3. It has two main shaft chucks and a loader above the two main shaft chucks, in which a swing arm is supported by a shaft that is rotatable and can freely move back and forth,
The above-mentioned swing arm is composed of two sets of forked arms that are opened at an angle such that a loader chuck provided at the tip thereof overlaps with the position of the two main shaft chucks, and the two sets of forked arms are symmetrical with respect to the shaft. A method for receiving and delivering a workpiece in a lathe supported by a shaft at a position other than the main shaft chuck, the workpiece being transferred from one workpiece loading chute provided above the spindle chuck to the two orifices of the one set. The first step involves loading the workpieces into the loader chucks at the ends of the bifurcated arms, and simultaneously loading the two machined workpieces chucked onto the spindle chucks into the loader chucks at the ends of the other bifurcated arm. a third step of simultaneously transferring and loading the unprocessed workpieces loaded on the bifurcated arms of one set to the empty spindle chuck; and a fourth step of transporting two processed workpieces loaded on the bifurcated arm to a single workpiece transport chute provided above the spindle chuck. How to receive and deliver work.