JPH0341299B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a machine with an intermittent rotary table for processing and assembling high precision parts.

For example, machines equipped with intermittent rotary tables are known for processing or assembling high precision parts such as electrical contacts, small metal parts, and ballpoint pen nibs. However, in known machines, mechanisms for moving work units in and out of work positions for performing predetermined work on a workpiece are generally provided on the outside of these work units, so they are bulky. Not only does this result in a taut structure, but it also becomes an obstacle when accessing the work unit or workpiece for repair or inspection.

An object of the present invention is to solve the above problems.

In order to achieve the above object, the present invention provides a rotary table 8 that is intermittently rotated while holding a workpiece, a main shaft 4 disposed coaxially with the rotary table, and a working position of the rotary table. and work units 20, 21, and 25 provided corresponding to The machine is configured to retract and rotate the rotary table intermittently, the main shaft is configured to reciprocate in the axial direction in synchronization with the intermittent rotation and stoppage of the rotary table, and the work unit is configured to reciprocate in the axial direction. The work unit is configured to be biased in the retracting movement direction and advance in conjunction with unidirectional axial movement of the main shaft by cams 16 and 17 provided on the main shaft, and The other direction movement is performed by rotating the cams 16 and 17 around the axis of the main shaft, thereby canceling the interlocking relationship with the working unit. and provides a machine with an intermittent table for assembly.

The functions and effects obtained by the above configuration will become clear from the embodiments described below based on the accompanying drawings.

Of the accompanying drawings, FIGS. 1 to 3 show an embodiment of the present invention, and FIGS. 4 and 5 show a modification in which a Maltese cross correction mechanism is added to the above embodiment. Although FIGS. 6 and 7 merely show other configuration examples of the interlocking relationship between the spindle and the work unit for reference, they show the configuration of the Maltese cross mechanism in more detail, so they are similar to those of the above embodiment. During the description, FIG. 7 will be referred to in the description of the Maltese cross mechanism.

The machine according to the embodiment of the present invention shown in FIGS. 1 to 3 mainly includes a main motor 1, two subshafts 2,
3, a central main shaft 4, a rotary table 8, an upper vertical working unit 20, a lower vertical working unit 21, and a horizontal working unit 25 (FIG. 2). The main motor 1 is installed at the bottom of the machine frame MF, and the subshafts 2, 3 and main shaft 4 are mounted on the machine frame MF.
They are rotatably supported in parallel to each other on the MF. The lower vertical working unit 21 is mounted on the machine frame MF immediately below the rotary table 8, while the upper vertical working unit 20 and the horizontal working unit 25 are mounted fixedly on the machine frame MF above the rotary table 8. It is supported by the body MB.

The rotational power of the main motor 1 is transmitted to both subshafts 2 and 3 via a speed reduction means including a toothed belt 5, and the rotation of these subshafts 2 and 3 causes the main shaft 4 to reciprocate up and down, and the rotary table 8 It is used for intermittent rotation. The main feature of the present invention is to use the axial movement of the main shaft 4 to move the working units 20, 21, 25 comprehensively into the working position in synchronization with the axial movement, and to retreat to the non-working position. The purpose of this movement is to take place quickly and independently of the movement of the spindle, thereby significantly increasing the space efficiency and operating speed of the machine as a whole.

A cylindrical cam 9 is fixed to a subshaft 2 that rotates continuously in conjunction with the rotation of the main motor 1.
A cam flange 9a is provided which is sandwiched between a pair of rollers 10 attached to a. This cam flange 9a is formed so that the main shaft 4 makes one reciprocating vertical movement while the sub shaft 2 rotates once. moreover,
Another cylindrical cam 11 is fixed to the subshaft 2,
A cam groove 11a is provided on its outer circumferential surface, with which a roller 12 supported at the lower end of the positioning rod 13 engages. This cam groove 11a is also formed so that the positioning rod 13 moves up and down one reciprocation while the subshaft 2 rotates once. Positioning rod 13
is raised during the stop time after the intermittent rotation of the rotary table 8 (during the time when the work units 20, 21, and 25 perform machining work), and its upper end corresponds to each work position on the outer periphery of the rotary table 8. By sequentially engaging the positioning holes 8a (after each intermittent rotation), the rotary table 13
is held in a predetermined position, while being lowered when the rotary table 8 rotates intermittently to permit such rotation. Note that the intermittent rotation of the rotary table 8 is
This is carried out via a Maltese cross mechanism 6 provided between the upper end of the subshaft 2 and the rotary table 8, and the configuration of this Maltese cross mechanism 6 will be described later.

Mounting bosses 1 are provided at the upper end and lower proper portion of the main shaft 4.
4, 15 are fixed, and these mounting bosses 14,
a plurality of cams 1 each protruding in the radial direction at 15;
6 and 17 are installed. The upper cam 16 acts on an L-shaped lever 19' swingably supported by a mounting ring MR fixed to the fixed mounting body MB, thereby moving the upper vertical working unit 20 in the vertical direction. That is, a cam follower roller 18' that can come into contact with the cam 16 is attached to one leg of the L-shaped lever 19', and the other leg is engaged with a pin to the upper end of the vertical work unit 20. There is. Therefore, when the cam 16 descends from the upper position shown by the solid line in FIG. 1 to the lower position shown by the phantom line in FIG. At this time, the rotary table 8 is in a stopped state after intermittent rotation. Note that the L-shaped lever 19' is always urged in the return direction by a spring (not shown), and in the return position, the mounting ring
It comes into contact with a stopper 24' provided on the MR. As a result, the work unit 20 is always urged in the retracting direction. Therefore, when the cam 16 rises or the main shaft 4 rotates slightly and the contact state between the cam 16 and the roller 18' is released (the third
As shown in the figure, the working unit 20 is retracted and raised to the non-working position by the spring biasing force (this point will be described later).

Some of the plurality of lower cams 17 are used to move the lower vertical working unit 21 in and out (FIG. 1), and the remaining ones are used to move the horizontal working unit 25.
It is used to let people enter and exit (Figure 2). As shown in FIG. 1, the mechanism for moving the lower vertical working unit 21 in and out includes an L-shaped lever 19 swingably attached to the machine frame MF. supports the roller 18 and the other leg engages the vertical working unit 21. The mechanism for moving the horizontal work unit 25 in and out, as shown in FIG. 2, includes a pair of levers 28a and 28c swingably attached to the machine frame MF, and a link 28b connecting both levers. A roller 27 is provided at a position where a lever 28a on the cam 17 side and a link 28b are connected. As described in connection with the upper vertical working unit 20, the lower vertical working unit 21 and horizontal working unit 25 are constantly urged in the retracting direction by a spring (acting on an appropriate lever) not shown. There is.

Depending on the type of work performed by each work unit 20, 21, 25, it is necessary to rotate the work unit brought to the work position about its own axis. In the embodiments shown in FIGS. 1 to 3, the following measures are taken to satisfy this requirement. That is, for the upper vertical work unit 20,
Rotatably attach the interlocking gear 22 to the mounting body MB,
This interlocking gear 22 is coupled to a driven gear 22b provided in each work unit 20 via a relay gear 22a, and the interlocking gear 22 is connected to a drive gear 43 attached to a drive shaft 42 connected to a motor (not shown) or the like. Match. Therefore, by rotating the single drive gear 43, all the upper vertical working units 20 coupled to the interlocking gear 22 are rotated synchronously about their own axes. On the other hand, the lower vertical work unit 21
are independently rotated about their own axes by individual motors 21'. Note that, if necessary, the horizontal work units 25 can also be rotated individually, and the work units to be rotated can also be selected.

As can be inferred from the above description, the rotary table 8 performs one operation by each of the work units 20, 21, and 25 (during that period, the rotary table 8 is stopped and the work units approach the workpiece). It is intermittently rotated each time the position is completed. In this case, from the viewpoint of improving work efficiency, it is desirable to be able to shift to intermittent rotation of the rotary table 8 immediately after the work by the work unit is completed. However, in a configuration in which the main shaft 4 only moves up and down, the rollers 18, 18', 27 are in constant contact with the cams 16, 17, so the working units 20, 2
1 and 25 can return only by following the rise of the main shaft 4. This means that it takes some time for the work unit to be separated from the workpiece to a certain extent and to be able to shift to intermittent rotation of the rotary table 8, especially when drilling work is involved.
This becomes a problem because a tool such as a drill enters the workpiece, and it takes a long time for the tool to be completely pulled out of the workpiece and to move beyond a certain distance. In the present invention, this problem is solved by the following means.

That is, as shown in FIGS. 1 and 3, the continuously rotating subshaft 3 has a small diameter portion 23a and a large diameter portion 23b.
A lever 24a having a roller 24b at its tip that contacts the cam plate 23 is fixed to a sleeve 24c fitted around the outer circumference of the lower end of the main shaft 4. This sleeve 2
4c rotates integrally with the main shaft 4 while allowing vertical movement thereof. Note that the support rod 4a provided inside the lower end of the main shaft 4 allows the main shaft 4 to rotate.
It moves up and down integrally with this. In this configuration, while the roller 24b is in contact with the small diameter portion 23a of the cam plate 23, the main shaft 4 is in the initial position (with respect to rotation), and the cam 16 for the work unit (only the upper vertical work unit 20 is shown) is in the initial position (with respect to rotation). (but the same applies to other working units) is in contact with the roller 18'. During this time, the rotary table 8 is stopped, and the main shaft 4 is lowered to advance and move the work unit as described above, so that the work unit performs a predetermined work. At the end of the work, the roller 24b is at a position where it is about to move from the small diameter portion 23a to the large diameter portion 23b, and the transfer to the large diameter portion 23b is completed in a short time. As a result, the main shaft 4, which is still in the lowered position, rotates forward to the position shown by the imaginary line in FIG. The urging force immediately returns the work unit 20 to the position where it contacts the stopper 24', and the work unit 20 is retracted and returned to the non-work position. Therefore, it is possible to shift to intermittent rotation of the rotary table 8 almost at the same time (or with only a very short delay) when one work is completed. It should be noted that while the roller 24b is in contact with the large diameter portion 23b, the main shaft 4 completes lifting and until the intermittent rotation of the rotary table 8 ends, that is, the main shaft 4
It is necessary that the main shaft 4 has returned to its initial position and rotated before it is lowered again.

The operation of the entire machine with the above configuration is as follows:
Although this should already be obvious, I will only outline the main points here. During the intermittent rotational stop of the rotary table 8, the position of the positioning rod 13 is raised.
In this state, the main spindle 4, which is at the upper limit position, is lowered to advance each work unit 20, 21, 25, and perform a predetermined work on the workpiece held on the rotary table 8. After completing one work, spindle 4
rotates forward to immediately evacuate each work unit,
With the positioning rod 13 lowered, the rotary table 8 is intermittently rotated by a predetermined angle, and the main shaft 4 is raised and returned to prepare for the next operation. Next, the positioning rod 13 is raised again to fix the rotary table 8 after the intermittent rotation, and the same operation as above is repeated. It goes without saying that the workpieces that have gone through all the work steps are discharged and the new workpieces are supplied at a predetermined station in a known manner.

Next, the structure of the Maltese cross mechanism 6 for intermittent rotation of the rotary table 8 is shown in FIGS. 1 and 7.
This will be explained based on the drawings, and a Maltese cross correction mechanism that can be added to this Maltese cross mechanism will be explained based on FIGS. 4 and 5.

As the Maltese Cross mechanism is well known,
This is an extremely simple mechanism that converts continuous rotational motion into intermittent rotational motion, and FIG. 7 shows an example of its configuration. In the figure, reference numeral 6a denotes a rotary disk that is attached to the upper end of the subshaft 2 (FIG. 1) and rotates integrally therewith. On the upper surface of this rotary disk 6a,
An arc-shaped stop engagement part 6 centered on the rotation axis
b, and a feed engagement portion 6c located eccentrically by a predetermined distance from this stop engagement portion. Further, the Maltese cross mechanism 6 is connected to the rotary table 8 (first
An index plate 7 is provided on the lower surface side of the figure (FIG.) and is integrally formed therewith. This index plate 7 has an engagement recess 7b that engages with the stop engagement section 6b of the rotary disk 6a, and an engagement groove 7a that engages with the feed engagement section 6c of the rotary disk. Therefore, even if the rotary disk 6a continuously rotates, the index plate 7 (i.e., the rotary table 8) does not rotate at a certain angle at which the stop engaging portion 6b engages with the engaging recess 7b, and the feed engagement does not occur. The index plate is rotated only within the angular range until the portion 6c engages with the engagement groove 7a and the stop engagement portion 6b enters the adjacent engagement recess 7b.

In the Maltese cross mechanism 6 shown in FIG. 7, the stop engaging portion 6b on the rotary disk 6a side engages with the engaging recess 7b on the index plate 7 side, thereby simultaneously positioning the rotary table 8 during the stop period. .
However, in the embodiment shown in FIGS. 1 to 3, since the rotary table 8 is positioned by raising the positioning rod 13, the stop engaging portion 6b of the rotary disk 6a and the engagement of the index plate 7 The recess 7b is omitted (although it is not necessarily necessary to do so).

The Maltese cross mechanism 6 configured as described above enables intermittent rotation of the rotary table 8, but generally in the Maltese cross mechanism, its mechanical configuration, such as the eccentricity of the feed engagement portion 6c, etc., is once fixed. For example, the characteristics of intermittent rotation (the speed is slow at the start and end of feed, and fast in the middle), the timing between the stop time and the feed time, etc. are fixed and cannot be changed any longer. However, by adding the Maltese cross compensation mechanism shown in FIGS. 4 and 5, various intermittent rotations can be achieved using the same Maltese cross mechanism.

In FIGS. 4 and 5, the subshaft 2 has a hollow structure, and the transmission shaft 35 extends through the interior thereof. The transmission shaft 35 can rotate independently of the subshaft 2, and a Maltese cross mechanism 6 similar to that shown in FIGS. 1 and 7 is provided at its upper end position. A rotary plate 37 is fixed to the lower end of the countershaft 2, and a driven gear 41 is fixed to the lower end of the transmission shaft 35 protruding from the countershaft 2. A sector gear 40 that meshes with the driven gear 41 is swingably attached to the rotary plate 37, and hangs down from the engaging pin 38 from an extension 40a (FIG. 5) of the sector gear 40. . A cam plate 39 fixed to the machine frame MF is provided further below the sector gear 40 and the driven gear 41, and the engagement pin 38 is engaged with a non-circular cam groove 39a formed in the cam plate 39. It's in.

In the above configuration, when the rotary plate 37 rotates together with the subshaft 2 at a constant speed, the engagement pin 38
The swing axis 40b of the sector gear 40 moves along a circular orbit while being slidably guided by the cam groove 39a. Now, assuming that the cam groove 39a is circular, the engagement pin 38 will also move along a circular orbit, so the sector gear 40 will take a certain rocking position (orientation), and the driven gear 41 in a fixed manner. Therefore, in this case, the driven gear 41 and the transmission shaft 35 fixed thereto rotate together with the subshaft 2 and the rotating plate 37 at a constant speed. However, in reality, since the cam groove 39a is non-circular, the engagement pin 38 guided by it also moves along a non-circular trajectory, and the sector gear 40 swings about the axis 40b. As a result, the driven gear 41 becomes the sector gear 4.
Due to the rotation caused by the zero swing, deviation from the normal constant speed rotation occurs. However, when the rotary plate 37 rotates once, the engagement pin 38 returns to its original position, so the driven gear 41 (transmission shaft 35) also rotates once. That is, the transmission shaft 35 similarly rotates once while the subshaft 2 rotates once, but is subjected to deceleration and acceleration during that one rotation.

If such a Maltese cross correction mechanism is used, it becomes possible to provide various intermittent motion generating functions to the same Maltese cross mechanism 6 by appropriately changing the shape of the cam groove 39a. for example,
It is also possible to lengthen the rotation stop period and shorten the intermittent feed period, or to keep the intermittent feed speed approximately constant.

Next, other configurations for linking the spindle and the work unit will be described as a reference example with reference to FIGS. 6 and 7. However, to avoid duplication of explanation,
The same reference numbers (symbols) are given to substantially the same members as in the first embodiment already described, and the explanation thereof will be omitted. Also, since the structure of the Maltese cross mechanism of FIG. 7 has already been fully explained, it will not be described here.

In FIG. 6, the main shaft 4 only moves up and down and does not rotate back and forth. Therefore, a mechanism for reciprocating the main shaft 4 is no longer necessary, and only a single sub-shaft 2 is provided, and the rotation of the sub-shaft 2 is converted into reciprocating up and down movement of the main shaft 4 and intermittent rotation of the rotary table 8. ing.

As described above, the reciprocating rotation of the main shaft 4 is necessary to quickly retreat the working unit 20 to the retreat position after completing a predetermined work and to shorten the time required for transition of the rotary table 8 to intermittent feeding. Therefore, if sufficient transition time is not a big problem, reciprocating rotation of the spindle 4 is not only unnecessary, but also advantageous in certain application fields because it simplifies the configuration. Sometimes.

In the configuration shown in FIG. 6, the vertical work unit 20 is disposed only above the rotary table 8, and this is attached to the machine frame.
It is supported via a bearing member 32 having a ball cage on a boss portion 33 of a mounting body MB fixed to the MF. This is similar to the embodiment shown in FIGS. 1 to 3 in that the movement of the work unit 20 into and out is performed using the up and down movement of the mounting boss 14 fixed to the main shaft 4. The following method is adopted. That is, some vertical working units 20
For the L that is swingably attached to the mounting body MB,
The lever 19' is used to engage the working unit through the pin 30 (this point is similar to the first embodiment), while the remaining working unit 20 is directly controlled by the vertical movement of the mounting boss 14. The fixed connecting member 34 is connected to the working unit 2 in order to
It is engaged with the annular engagement groove 30 on the 0 side. In addition,
The annular engagement groove 30 is an adjustment member 29 for position adjustment.
The same applies to the working unit operated by the L-shaped lever 19'.

In the case of the above configuration, the Maltese cross mechanism 6 for intermittently rotating the rotary table 8 is stopped at the engaging portion 6b.
Since the positioning of the rotary table 8 is also performed at the same time, the positioning rod 13 having the configuration shown in FIG. 1 becomes unnecessary.

As explained above, according to the machine of the present invention, the main shaft coaxial with the rotary table is used to advance and move each work unit and perform the subsequent work, thereby significantly improving the space efficiency of the entire machine. Not only can the retracting movement of the working unit be improved, but the retracting movement of the working unit is configured to be performed quickly by cutting off the interlocking relationship with the main shaft using the biasing force applied to the work unit itself. Following the evacuation of the work unit, the positioning of the rotary table for the next process is carried out quickly, and as a result,
This has the effect of significantly increasing the operating speed of the entire machine and increasing the efficiency of manufacturing the target product.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing the overall configuration of a machine according to an embodiment of the present invention, Fig. 2 is an enlarged longitudinal sectional view showing a horizontal working unit in the same machine, and Fig. 3 is a reciprocating main shaft in the same machine. FIG. 4 is a vertical sectional view of a main part showing a modified example in which a Maltese cross correction mechanism is added, FIG. 5 is a view taken along the - line in FIG. 4, and FIG. The figure is a longitudinal sectional view showing a reference example, and FIG. 7 is a view along the - line in FIG. 6. 1...Main motor, 2, 3...Subshaft, 4...Main shaft, 6...Malta cross mechanism, 8...Rotary table, 9, 11, 16, 17, 23...Cam, 13
...Positioning rod, 14,15...Mounting boss,
20, 21, 25... work unit, 21'...
Independent motor, 22... Interlocking gear, 24, 24'...
... Stopper, 35 ... Transmission shaft, 37 ... Rotating plate,
38... Engaging pin, 39... Fixed cam plate, 39
a... Cam groove, 40... Sector gear, 41... Driven gear.

Claims (1)

[Scope of Claims] 1. A rotary table 8 which is intermittently rotated while holding a workpiece, a main shaft 4 disposed coaxially with the rotary table, and a rotary table 8 disposed in correspondence with the working position of the rotary table. The working units 20, 21,
25, and configured to move the work unit forward and perform a predetermined work on the workpiece during the stop period of the rotary table, and then retreat the work unit and rotate the rotary table intermittently. The machine is configured such that the main shaft reciprocates in the axial direction in synchronization with the intermittent rotation and stoppage of the rotary table, while urging the work unit in the retracting direction and providing a mechanism on the main shaft. The cams 16 and 17 are configured to advance the work unit in conjunction with the movement of the main shaft in one direction in the axial direction, and the movement of the main shaft in the other direction causes the cams 16 and 17 to move in the axial direction of the main shaft. 1. A machine having an intermittent table for machining and assembling high-precision parts, characterized in that the interlocking relationship with the working unit is released by rotating the table around an axis. 2. A lever mechanism 19, 19', 28a that links the movement of the cams 16, 17 to the working unit.
Claim 1, characterized in that the working unit is linked to the advancing movement of the working unit via the working unit 28c.
Machines mentioned in Section. 3. The working unit is substantially urged in the retracting direction by urging the lever mechanism, and the lever mechanism is in such a way that it abuts the fixed stoppers 24, 24' in the retracted position. 3. Machine according to claim 2, characterized in that it comprises: 4. Rotating cam mechanisms 23, 24a for reciprocating the main shaft are provided, and the main shaft or the cams 16, 17 are rotated after the work of each work unit is completed, thereby interlocking the main shaft and the work unit. The machine according to claim 3, characterized in that the relationship is released. 5. The rotary cam mechanism includes a cam plate 23 attached to the subshaft 3 that is parallel to the main shaft and continuously rotates.
5. The machine according to claim 4, further comprising: a lever 24a for reciprocating the main shaft under the action of the cam plate. 6 A sub-shaft 2 that is parallel to the main shaft and rotates continuously.
By attaching a cylindrical cam 9 to the cylindrical cam and connecting one end of the main shaft to the cylindrical cam via a cam follower 10, the main shaft is configured to reciprocate in the axial direction, and the rotation of the sub-shaft 2 is The machine according to any one of claims 1 to 5, characterized in that the rotary table is configured to be rotated intermittently via a cross mechanism. 7 Further, a second
A second cylindrical cam 11 is attached, and this second cylindrical cam is connected to a positioning rod 13 via a cam follower 12.
into an axial reciprocating motion, thereby permitting intermittent rotation of the rotary table and causing the positioning rod to engage with and position the rotary table during a stop period after the intermittent rotation. Machine according to claim 6, characterized in that: 8. The machine according to claim 6, wherein the subshaft 2 to which the cylindrical cam 9 is attached is connected to the Maltese cross mechanism via a Maltese cross compensation mechanism and a transmission shaft 35. . 9 The Maltese cross correction mechanism includes a rotating plate 37 fixed to the subshaft 2, a sector gear 40 swingably attached to the rotating plate, and a non-circular cam provided opposite to the sector gear. Groove 39
a fixed cam plate 39 having a fixed cam plate 39, an engaging pin 38 that is fixed to the sector gear and engages in the cam groove, and a driven gear 41 that is fixed to the transmission shaft 35 and meshes with the sector gear; Claim 8, characterized in that
Machines mentioned in Section. 10. The machine according to any one of claims 1 to 9, characterized in that all or a selected group of the working units are configured to rotate automatically. 11 Rotation of the working unit around its own axis,
It is characterized in that it is performed by an interlocking gear 22 that is rotated around the main shaft by a single driving source,
A machine according to claim 10. 12 Rotation of the working unit around its own axis,
11. Machine according to claim 10, characterized in that it is operated by a separate motor. 13 The work units include a vertical work unit 20 located above the rotary table and a vertical work unit 2 located below the rotary table.
13. A machine according to any one of claims 1 to 12, characterized in that it comprises: 1 and a horizontal working unit 25 located on the side of the rotary table. 14. Machine according to any one of claims 1 to 12, characterized in that the working units include at least a vertical working unit 20. 15 At least a portion of the vertical work unit 20 is connected to the main shaft via a connecting member 34, so that the vertical work unit directly axially interlocks with the main shaft to perform reciprocating motion. 15. A machine according to claim 14, characterized in that it is constructed as follows. 16. Machine according to any one of claims 1 to 15, characterized in that the working unit is equipped with an adjustment member 29 for position adjustment.