JPS59102501A - Turret lathe provided with measuring device for work - Google Patents

Abstract

PURPOSE:To make the second work correctible, by measuring an inside diameter or the like of a work with a measuring pin to be inserted into the center hole of a half-machined work and a measuring device at the point midway in an outgoing chute, while feedback-controlling the travel of each turret tool rest. CONSTITUTION:A measuring head tip part 36a is inserted into a center hole P of a work W, while a measuring pin 42 for a micrometer is made to project sidewards, then the inside diameter of a half-machined work Wq is measured. On the other hand, such a work Wr as being machined on both sides by two spindles 1 and 2 is measured its side diameter or the like at a measuring device 63 at the point midway in an outgoing chute, and on the basis of the measured value, the travel of each of turret tool rests 9 and 10 is feedback-controlled, thus measuring for each of second works Wp and Wq being loaded on each of these spindles 1 and 2 is properly corrected, so that wastage in these works taken out in a state of being inadequately machined intact can be brought to nothing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a two-spindle lathe equipped with a workpiece measuring device fa.

A lathe shown in Fig. 1.3 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, the lathe shown in Fig. 1 has two spindle chucks (
1) (2) An X-shaped rotating arm (4) is supported by a shaft (3) that is rotatable and movable back and forth and is provided above the main shaft chucks (1) and (2). loader(
5) and a fixed chuck (
6) and a rotating chuck (7) that rotates around a vertical axis.
' It is composed of a turret tool rest (9) (10) that is freely movable in the axial direction, and the four arms (4a) (4b) (4c) (4d) of the above-mentioned rotating arm (4), Tip M (':, loader chuck (11) (1) provided respectively
2) (13) and (14) are the main spindle workpieces (1)
It is open at an angle that can overlap with (2), and this loader (
5), the workpiece (b) sent over the carry-in chute (15) is placed in the two spindle chucks (b) as follows.
1) Load the work into (2) and the workpiece reversing device (8) in order, perform one turn, and unload the chute (16).
It is designed to be sent to

That is, as shown in FIG. 2, the mass loader (5) is fully retreated and the loader chuck (1
1) Load the unfinished material work (Wp) (Figure 2 (a)).

At this time, the spindle chucks (1) and (2) hold a partially machined workpiece (Wq) that has already been machined in the previous machining cycle, that is, a workpiece that has only the surface machined (Wq), and a fully machined workpiece (Wr). That is, the workpiece (Wr) whose back surface has also been processed is chucked.

A semi-QO finished workpiece (wq) whose surface has been machined in the previous machining cycle and has been reversed by the rotating chuck (7) is chucked in the fixed chuck (6) of the front-back reversing device (8J).

Next, the loader (5) is moved forward and sub-rotated by 90 degrees in the direction of the arrow to bring the loader (5) into the state shown in Fig. 2 ((b)), and the main shaft is chucked by the loader chucks (13) and (14). (1) Receive the chucked workpieces (Wq) (Wr)Y in (2), and loader chuck (
12) receives the half-shelf machined workpiece (Wq) on the fixed chuck (6) (Fig. 2P)).

Loader chuck (11) (12) (13) in the above condition
(14) respectively work (wp) (Wq) (Wq)
(Wr) is chucked and the spindle chuck (1
) (2) is empty, so next, rotate the loader (5) 180 degrees in the direction of the arrow to bring it into the state shown in Figure 2 (c).

In this state, move the loader [5] backward and loader chuck (1
1) Place the unprocessed workpiece (Wp) above (12) and the semi-7J processed workpiece (Wq) into the empty spindle chuck (
1) At the same time as transferring to (2), the semi-finished workpiece (Wq) on the loader chuck (13) is transferred to the rotating chuck (
7) Transfer upwards (Fig. 2 e).

Therefore, all machined workpieces (Wr) are moved to the loader chuck (
14), then rotate the loader (5) by 90 degrees in the direction of the arrow until it becomes the shape shown in Fig. 2) (11).
The raw workpiece (Wp) on the carry-in chute (15) is
), and simultaneously rotates the spindles (1) and (2) to start IJD turning of the workpieces (Wp) and (Wq), respectively (see Fig. 2).

(Wq) is transferred to the fixed chuck (6) side, and the workpiece (
Make sure that the back side of Wq) faces forward.

With this, the loader (5) returns to its original position again and one cycle ends.

The lathe shown in Figure 3 has almost the same structure as the lathe shown in Figure 1, and the same structural parts are given the same numbers and explanations are omitted, but this lathe has a main spindle chuck ( 1
) A rotating arm (17) supported by a shaft (3) that is rotatable and movable back and forth provided above (2) is the first
It is not X-shaped like the lathe in the figure, but instead has the following shape.

In other words, the turning arm (17) of this lathe is provided at its tip as shown in Figure 1 (similar to a dual lathe) so that two workpieces (5) can be transferred to the spindle chucks (1) and (2) at the same time. Loader chuck (21) (22) (23) (
24) two sets of bifurcated arms (17a) (1
7b) (17c) (17d), and these bifurcated arms (17a) (17b), (17
c) (17d) is not in a symmetrical position around the shirt hanger (3), i.e. not in an X-shape, but its two sets of arms (17a) (17b), (17c) (17d)
It is arranged so that the included angle (α) in between is opened to an acute angle as shown below, and is fixed to the shaft (3).

That is, the included angle (α) is the angle between one set of arms (17a) and (17b) when the swing arm (17) is directed directly upward.
) loader chuck (22) and the other set of arms (17)
C) The loader chuck (23) (17d) is set at an angle so that it overlaps the fixed chuck (6) and the rotating chuck (7) of the workpiece front-back reversing device (8).

In the lathe shown in Fig. 3, the loading shoe)
(15) The workpiece (b) sent above is loaded in order into the two spindle chucks (1) (2) and the workpiece reversing device (8) as follows, and turned.
(16).

As shown in FIG. 4, the mass loader (25) is retracted and one set of forked arms (1
Loader chucks (21) and (22) of 7a) and 17b are loaded with loose workpieces (Wp) from above the loading chute (15), respectively.
) are simultaneously loaded from above the fixed chuck (6) of the front/back reversing device (8) with the half/JO completed workpiece (WQ)'Y (Fig. 4 (a)).

The semi-rolled workpiece (Wq) on the above fixed chuck (6)
) had already been subjected to surface turning in the previous IJII cycle and had been turned over so that the back side was facing forward.

The rotating chuck (7) has a half υ loe workpiece (Wq
) is checked.

At this time, the main spindle chuck (1) (2) has the previous υ
Semi-machined workpieces (Wq
), that is, the workpiece (Wq) whose surface has been υroed and the entire υ
The Loe completed work (Wr), that is, the work whose back side has also been covered (Wr) is chucked.

Next, the loader (z5) is moved forward and rotated approximately 135 degrees in the direction of the arrow to move the loader (25) to the position shown in Figure 4 (
(b), and the other set of loader chucks (23
) (24) l2 Therefore, the spindle chuck (1) (2)
Receive the workpieces (Wq) (Wr) that have been nipped (see Figure 4).

After this, rotate the rotating chuck (7) and move it to the side of the half-leg chuck (6) with the surface facing forward and invert it.

Loader chuck (21) (22) (23) in the above condition
(24) All the workpieces above (WI)) (Wq) (W
(!) (WJ-) is chucked and the spindle chuck (1
) Since (2) is empty, next turn the loader (25 inches) about 90 degrees in the direction of the arrow to bring it to the state shown in Figure 4C.

In this state, move the loader (25) backward and loader chuck (
21) Place the unprocessed workpiece (wp) and semi-processed workpiece (Wq) on (22) into the empty spindle chuck (1
) Transfer to (2) (Figure 4 ('j-).

Next, rotate the loader (25) by 2ft approximately 135 degrees in the direction of the arrow.
) (22) is loaded with the workpiece, and the other set of loader chucks (23) and (24) are loaded with the semi-processed workpiece (Wq) and the finished workpiece (Wr), so the machining process will start. (16) Transfer the completed workpiece (Wr) to the upper part and transfer it to the semi-processed workpiece (Wq
) is transferred to the rotating chuck (7) of the reversing device (8) (as shown in Figure 4), one cycle is completed.0 The lathe shown in Figure 1.3 is as shown above. However, these lathes also automatically measure the workpiece being carried out on the carry-out chute (16) and control the movement of the turret tool rest (9H10) based on the measured value using i&feedback control to improve the workpiece. Accurate C: υ day work (2).

However, in the above lathes, because they perform front and back υΩ machining in the cycle described above, the unloading shoe ) (16)
Even if the workpiece being carried out from the top of the loader (5) (25) or the main spindle chuck (1 bar is dry) is measured, and based on the measured value, the workpiece is immediately moved to the turret tool rest (9) uo)y even if feedback control is performed. The several workpieces above had already been machined, and the parts that needed correction discovered by measuring the workpieces had not been corrected, resulting in unnecessary workpieces being produced.

That is, in the lathe shown in Fig. 1.3, the transport (1)
(2) Upper, 2 or 3 pieces on the work reversing device (8)
A part of the workpiece (WQ) has been partially processed, and the workpiece (Wq) may be unsuitable, may be carried out in an unprocessed state, or may be further processed and carried out. be.

In order to eliminate waste as described above, for example, the measuring head of the workpiece is attached to the turret tool rest (9) and (10), and after the machining of one leg on one side of the spindle is completed, the turret tool rest (9) is ) (10) is moved for measurement, the number of tools attached to the turret tool rest (9) and (10) decreases accordingly, which reduces the overall υloe cycle time. Another problem arose: lengthening.

Therefore, in the 2@ type lathe as described above, the feed pack control based on the measured value of the workpiece can be applied to the workpiece to be machined next to the measured workpiece without causing any of the other problems mentioned above. The purpose is to provide a hanging lathe that can be immediately applied and minimize the production of incorrect workpieces, and the gist is that a workpiece measuring device is attached to the workpiece reversing device in the lathe as described above. It is in.

Next, an embodiment will be described. In FIGS. 5 to 7, an example will first be shown in which the present invention is applied to a lathe in which the loader (5) shown in FIG. 1 has an X-shape.

In the figure, the parts of the device with the same numbers as the lathe shown in FIG. 1 are the same parts of the device as the lathe shown in FIG.
The structure is the same except for the workpiece reversing device, so the explanation will be omitted, and the workpiece reversing device (2
8) will be explained in detail.

The workpiece reversing device (28) of this example includes a boss (31) having a C-shape in side view provided on the bearing block (29) of the shaft (3) of the loader (5), and the boss (31). 31) Rotary actuator mounted on the top (32
) and a workpiece measuring device (35) fixed to the side of a bearing block (29). The workpiece (b) delivered to (34) is placed on the vertical axis (33) by the rotating chuck (34).
), then rotate the measuring device (35
When the measuring head (36) of the measuring head (36) +5- protrudes forward, the measuring head (36) fits into the center hole of the annular workpiece (5) held by the rotating chuck (34), and the annular It is designed to measure the inner diameter of the workpiece (5).

(37) is a support for the rotating chuck (34), and (38) is a rotating arm.

Next, based on FIG. 6, a workpiece measuring device (35
) to explain in detail, this workpiece measuring device (35)
is the measurement head (36) of the workpiece and the measurement head (3
6) Advance/retreat moving device @ (41)
36) has a tip ('36a) outer diameter corresponding to the center hole (P) of the workpiece (B) to be handled, and grooves (36b) bored on both sides.
), a measuring bottle (42) of a micrometer built in the tip (36a) projects horizontally to both sides and hangs therefrom.

(36C) is a flange portion for holding the workpiece (B), and (36d) is a flange portion on the proximal end side, which is a support provided on the moving plate (43). The measurement head (36) is loosely fitted in the box (44), and the distal end (36a) of the measuring head (36) is slightly swingable relative to the movable plate (43), and is moved forward by the rotating chuck (34). The workpiece (5) moves slightly depending on the position of the workpiece (5) being held, and even if there is a slight positional deviation, the workpiece (5)
The measurement head (36) is fitted into the center hole ψ) of the hole 5) so as to hang therein.

(45) is the support box (44) and the flange part (36d
) is a steel ball inserted between.

And the movement & (43) is the guide tube (46) (47) provided on the upper soil part? , bracket (48) (49)
It was fixed to the fixing plate (39) through the id shaft (5).
1) It is slidably supported by (52) and can be moved in the front and back direction.
l Two fixed (53) (54) I, connected to the end of the cylinder (55) (56)
5) expands and contracts, the measuring head (36) moves to the movable plate (4).
3), it moves back and forth in parallel (6th
Figure solid and dashed lines). (58) is a strut bolt that regulates the protruding position of the tip of the rond (56) of the cylinder (55). This is a proximity switch, and (61) and (62) are a fixing plate (39) and a rib and a connecting block that are fixed to the bearing block (29).

The lathe of the embodiment shown in Fig. 5.6 operates on the υloe cycle shown in Fig. 7, which is similar to that shown in Fig. 2 and explained at the beginning, and turns the workpiece (b). 7), the ball shafts (1) and (2) are rotated, and the main shaft (1
) (2) Workpiece gripped by (W+)) (Wq)
Before υloe, work (Wq) (
Wr) is measured.

That is, the rotating chuck (34) is rotated, the measuring head (36) is held forward on the workpiece (Wq)' whose surface has already been machined (dotted chain line in Fig. 6), and then the tip of the measuring head is placed as described above. The part (36a) is inserted into the center hole (P) of the workpiece (5), and the measuring pin (42) of the micrometer is made to protrude laterally, and the semi-finished workpiece (Wq) is
The inner diameter of the workpiece (Wr), which has already undergone υroe on both the front and back sides using the other two spindles (1) Cd, is measured by a known measuring device (63) installed in the middle of the carry-out chute (16). Measure the inner diameter etc.

Then, based on the measured values, each turret tool rest (9
) (10) is feedback-controlled, and the main axis (
1) '7 of each second examiner roped in (2)
- Properly correct the weight of (Wl) (W(1)) In other words, the half j measured by the measuring head (36)
Based on the measured values of JD Ework (Wq), the main 1t on the left side of Figure 5! l1lI (1), turret tool rest (9),
Based on the measured values of all processed workpieces (Wr) measured by the measuring device (63) on the unloading chute (16), the main shaft (4, turret tool post (10) on the right side of Fig. 5 is feedback-controlled). .

The rotating chuck (34), which has delivered the semi-processed workpiece (Wq) to the measuring head (36) as described above, immediately returns to its original position, and the rotating chuck (34) transfers the semi-processed workpiece (Wq) to the measuring head tip (34a). The semi-finished workpiece delivered to (
Wq), when the process progresses to the state shown in FIG. 7(O), the loader (5) moves backward and the loader chuck (12)
) is removed from above the measuring head (36).

In addition, the rotating chuck (34) which was delivered to the workpiece (Wq)\measuring head (36)-X in the state shown in Fig. 7) turns 180 degrees again as described above and returns to its original position, but the workpiece (W
The inner diameter of the center hole ψ of the measuring head (36
) is moved forward but the measuring head tip (36a) does not fit into the center hole (P) of the workpiece (Wq) held in front of the measuring head (36) [Secondly, when the proximity switch ( 60) is not closed, the operation of this lathe is automatically stopped, and the worker takes out the workpiece (WQ) as an N0 item.

Of course, even if the inner diameter of the workpiece (WQ) is found to be excessive as a result of measurement by the measuring head (36), it is also possible to automatically stop the operation of the entire lathe without performing feedback control.

Next, Figs. 8 to 10 show an embodiment in which the present invention is applied to the loader (25ylX palm-shaped lathe) shown in Fig. 3.

In the figure, the equipment parts with the same numbers as the lathe shown in Fig. 3 are the same equipment parts as the lathe shown in Fig. 3, and they have the same structure except for the device for reversing the workpiece. Therefore, the description will be omitted, and the workpiece reversing device of this embodiment will be described in detail below.

The workpiece reversing device (68) in this example has roughly the same structure as the above-mentioned reversing W (8), and is installed on the bearing block (29) of the shaft (3) of the loader (25). is a C-shaped boss) (69), and a rotating chuck (7
2) and a workpiece measuring device (73) fixed to the side surface of the bearing block (29). 74) is milled, the center hole C of the workpiece (b), which has an annular tip with a built-in micrometer, is removed.
Reference numeral 0 (75) is a rotating arm of a rotating chuck (72) that fits into the annular workpiece (P) and measures the inner diameter of the annular workpiece (B).

Next, based on FIG. 9, bearing block (29) 91t1
To explain in detail the measuring device (73) for the workpiece fixed to the surface via the fixing plate (76), the measuring device (73) includes a measuring head (74) for the workpiece and the measuring head (74).
A measuring head (74)
) is the tip (
74a) A measuring pin (78) of a micrometer built in the tip (74a) projects horizontally to both sides from grooves (74b) that have an outer diameter and is hung on both sides. .

(74C:) is the flange part for holding the workpiece, (79)
is a proximity switch for detecting the presence or absence of a workpiece attached to the flange portion (74c), and (74d) is a flange portion on the proximal end side. The recess (81) is loosely fitted into a link ball (83) screwed onto the upper end of the moving plate (82), and the tip side of the measuring head (74) is attached to the moving plate (82). The flange portion (74
d), move the three poles (84) protruding from the movable plate (8
2) through the through hole (85) drilled in the movable plate (8
A compression spring (87) is interposed between the nut (86) screwed on the measuring head (74) Y and the measuring head (74) always extends horizontally forward as shown in Fig. 9. It is adjusted so that

By doing as described above, the measuring head (74)
The tip of the measuring head (74) moves slightly depending on the position of the workpiece (5) held forward, and even if there is a deviation in the position of the workpiece, the measuring head (74) moves toward the center hole (P) of the workpiece. 74) can be inserted.

Then, the movable plate (82'JI'!) and the guide tubes (88) and (89) provided at the lower and middle parts of the movable plate (82'JI'!) are connected to the bracket (92'JI'!).
0) is slidably supported on guide shafts (92) and (93) fixed to the fixed plate (76) via (91),
The guide tube (88) is movable in the front and back direction.
(89) is similarly fixed to the fixing plate (76) (9).
4) Connect (
97) L (solid line and chain line in Figure 9)
(98) and (99) are proximity switches that detect the forward and backward positions of the movable plate (82), that is, the measurement head (74), respectively (-(00) is a stopper bolt that regulates the forward position of the movable plate (82) .

The lathe of the embodiment shown in FIG. 8.9 operates on the υ Loe cycle shown in FIG. 1, and this IJ Loe cycle is similar to that shown in FIG. ) are reversed on the left and right.

The lathe of this embodiment measures the workpieces (Wq) and (Wr) in the following manner before starting the machining process shown in FIG. 10.

That is, in FIG. 10), the loader (25) is moved backward and is gripped by the loader chuck (z3) (74).
When held forward, the measurement head (74) is advanced as described above, and the tip (74) of the measurement head (74) is moved forward.
a) is inserted into the center hole (P) of the workpiece, and the measuring pin (78) of the micrometer protrudes to create a half-loe workpiece (
The inner diameter of the workpiece (Wq) is measured (dotted chain line in Figure 9). When the measurement is completed, the loader (25) moves forward and the workpiece (Wq))
It remains on the measurement head (74) while being delivered onto the tip (74a) of the measurement head (74).

The workpiece (Wr), which has already been machined on both the front and back surfaces using the two main spindles (1 bar 2), has its inner diameter etc. measured by a known measuring device (63) installed in the middle of the carry-out chute (16).

Then, based on the measured values, each talent tool rest (9
)(10) is feedback-controlled and the main 11i1
11 (1) The machining of the second workpieces (Wp) (Wq) loaded in (2) is appropriately corrected.

In other words, based on the measurement value of the semi-7JO ework (Wq) measured by the measurement head (74), the main shaft (phantom) on the right side of Fig. 8, the turret tool rest (10) is ) The main shaft (1) and the turret tool rest (9) on the left side of FIG. 8 are feedback-controlled based on the measured value of the fully worked workpiece (Wr) measured by the measuring device (63) on the top ( ).

In addition, as described above, the tip part (74) of the measurement head (74) is
4a) Semi-finished workpieces remaining on top (
Wq), when the process proceeds to Fig. 10 (ri), the rotating chuck (72) rotates and
2) and is pulled out from above the measurement head (74), and in the next step shown in FIG.

In addition, in the state shown in FIG. 10 described above, the loader (25) moves backward to hold the workpiece (Wq) in front of the measuring head (74), and moves the measuring head (74) forward to open the center hole of the workpiece (Pi). Even if you try to fit the tip (74a) into the center hole (P) of the workpiece, if the inner diameter of the center hole (P) is too small, the measuring head (74) will not fit into the center hole (P) and will not move forward. Therefore, the proximity swing f (99) does not close,
It is detected that the workpiece (Wq) is an NG product, and in the case of this lathe, as shown in Fig. 10 (7), the loader (25)
turns once in the direction of the arrow and the loader chuck (2
3), the workpiece (Wq) that is not gripped is automatically ejected through the ejecting shoe (16).

After discharging the NG workpieces (Wq), the loader (25) returns to the state shown in FIG. 10), that is, the state shown in FIG. During the machining cycle, the υ loe of other workpieces (Wp) cwq) advances in the missing state.

That is, the proximity switch (79) of the measuring head (74) detects that the workpiece (Wq) of the N() product is missing during the machining cycle, and the proximity switch (79)
A signal is sent to the subsequent process that would be followed if the NG workpiece (Wq) is not removed, that is, to each device part of the swing chuck (72), loader chuck (22), and main shaft (1). , each of those devices (72) (22) (1
) Confirm the presence of the workpiece (B) installed in ) Cancel the workpiece no signal for the N ( Other work (Wp) with missing
(WQ) processing is now underway.

Of course, even if the inner diameter of the workpiece (b) is too large as a result of measurement by the measuring head (74), the workpiece (b) can be automatically removed by the same division method as described above without performing feedback control. is also possible.

When the present invention is applied to a lathe in which the loader (25) is palm-shaped as described above, as a result of measurement by the measuring device (73), the workpiece (b) significantly exceeds the set value.
In other words, the rejected workpiece (B) can be discharged onto the unloading chute (16) by overturning the loader (25) as described above (Fig. 1 (7));
is palm-shaped, and even if the loader chuck (23) gripping the defective workpiece (b) is indexed to the unloading chute (16) position (Fig. 1 (19), other parts of the loader (25) The arms (17a) (17b) (17d) are connected to the main shaft (1
)(2) position, the main axis (υ(2) and the main axis (1)
(2) The work loaded in (Wp) (
This is possible because it does not interfere with the turret tool rest (9) (10).

In addition, in the above two embodiments, the workpiece measuring device (35)
(73) has a measuring head (36) (74) & which fits into the center hole (P) of the workpiece, and the measuring head (3
6) Although the inner diameter of the workpiece (5) was measured using a micrometer built into the (74), the workpiece measuring device is not limited to the above example, and can be used to measure the inner diameter of the workpiece (5). It may have a diameter measuring head to measure the outer diameter of the workpiece, or it may have a clamping means for clamping the workpiece in the thickness direction to measure the thickness of the workpiece.

Further, the workpiece reversing devices (28) and (68) are not limited to the above-mentioned embodiments; for example, as shown schematically in FIG. - A movable frame (101) movably supported
02), a rotary actuator (10) attached to the moving frame (102), a gripper (104) rotatable around a vertical axis, and a cylinder (105) for moving the moving frame (102). The gripper (104) may be reversed while moving back and forth between the solid line in FIG. 11 and the chain line in FIG.
Since the outer diameter is immediately indicated by the opening angle of the gripper (104), if a measuring device is installed inside the gripper (104), measurement can be performed simultaneously with clamping, and the workpiece (b) can be reversed more quickly.

In any case, as described above (2), the present invention is a σ-dock which is made up of two main spindle chucks and a rotatable and longitudinally movable shaft provided above the two main spindle chucks, and a swing arm supported by the shaft. and a workpiece reversing device provided above the loader. In a lathe consisting of a set, a workpiece measuring device is attached to the workpiece reversing device, and the second measurement of the workpiece is performed while the workpiece is being supported by the workpiece reversing device, thereby reducing the machining cycle time. The workpiece can be measured in the middle of the machining cycle without any delay, and the D-loe of the succeeding workpiece can be immediately feedback-controlled based on the measured value.

[Brief explanation of drawings]

Figure 1 is a perspective view of a two-spindle lathe with an X-shaped loader.
Figure 2 is an explanatory diagram of the machining cycle of the lathe shown in Figure 1, Figure 3 is a perspective view of a loader-shaped two-spindle type lathe, and Figure 4
The figure is an explanatory diagram of the machining cycle of the lathe shown in Figure 3, Figure 5 is a partially omitted front view of a lathe with an X-shaped loader implementing this invention, and Figure 6 is a measurement of a workpiece with the fixing plate omitted. A side view of the device (an enlarged view along the ■-■ line in Fig. 5), Fig. 7 shows the
Fig. 8 is a partially omitted front view of a loader-shaped lathe embodying the present invention, and Fig. 9 is a side view of a work measuring device (Fig. 8). IX-IX
FIG. 10 is an explanatory view of the machining cycle of the lathe shown in FIG. 8, and FIG. 11 is a schematic front view showing another embodiment of the device for reversing a workpiece. (1) (2)...Spindle chuck (3)...Shaft (4) (17)...Swivel arm (5) (25)...Loader (28) (68)... Workpiece turning device (11)
(12) (13) (14) Loader chuck (21
)12)(23)(24)...Loader chuck (35
) (73) ...Workpiece measuring device No. 2 (A) Just Q\) Decoy (B) (D) (A) No. 8 I) Decoy (B) (D) (/\) (B) R 11) Figure 13-

Claims (1)

[Claims] A loader comprising two main spindle chucks, a rotating arm supported by a rotatable and freely movable shaft provided above the two main spindle chucks, and a workpiece reversing device provided above the loader. In a lathe consisting of two sets of bifurcated arms in which a loader chuck provided at the tip of the swing arm is opened at an angle spanning the positions of the two main spindle chucks, the workpiece is turned over by the workpiece reversing device. A lathe equipped with a workpiece measuring device, characterized in that it is equipped with a measuring device.