JPH04348848A - Positioning device for dividing device - Google Patents

Abstract

PURPOSE:To reduce the size of the whole of a dividing device by converting axial movement of an input shaft into axial movement of a transmission shaft through a pin and a guide groove, converting axial movement of the transmission shaft into axial movement of a positioning shaft through a pin and a guide groove, and engaging and disengaging a positioning pin with and from a positioning locking part. CONSTITUTION:Axial movement of an input shaft 45 is converted into axial movement of a transmission shaft 60 through a guide pin 62 (63) and a guide groove. Further, axial movement of the transmission shaft 60 is converted into axial movement of a positioning shaft 55 through a pin 58 and a guide groove 57. A positioning pin 56 at the tip of the positioning shaft 55 is engaged and disengaged with and from an engaging claw 52. This constitution prevents the occurrence of rocking, resulting in reduction of a surplus space.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indexing device mounted on a processing table of a machine tool such as a machining center, and more particularly to a positioning device for positioning an indexing table by moving an input shaft in the axial direction.

0002

2. Description of the Related Art A positioning device for an indexing device as described above is disclosed, for example, in Japanese Patent Laid-Open No. 39752/1983. For this, the push bar is moved up and down by the vertical movement of the main shaft of the machine tool, and the pin at the tip of the push bar engages with the engagement groove of the swing lever, causing the swing lever to swing around the swing shaft. A positioning pin provided at the center in the longitudinal direction of the indexing table is shown to be engaged with and disengaged from an engaging pawl (positioning locking portion) integrated with the indexing table.

0003

[Problems to be Solved by the Invention] In the above-mentioned conventional technology,
Since the positioning pin is engaged with and disengaged from the engaging pawl by the swinging of the driven lever, a relatively large space is required for the swinging lever to swing, resulting in an increase in the size of the entire indexing device.

0004

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides an indexing device in which a positioning pin is engaged and disengaged from a positioning locking portion integrated with an indexing table by moving an input shaft in the axial direction. In the positioning device, a positioning shaft having a positioning pin at its tip is provided so as to be movable reciprocally in a direction toward the positioning locking part, and a transmission shaft intersecting the positioning shaft and the input shaft is movable reciprocally in the axial direction. The input shaft and the transmission shaft and the transmission shaft and the positioning shaft are connected by pins and guide grooves, respectively, and the axial movement of the former in each combination is converted into the axial movement of the latter. .

[0005]

[Operation] The axial movement of the input shaft is converted into the axial movement of the transmission shaft through the pin and guide groove, and the axial movement of the transmission shaft is converted into the axial movement of the positioning shaft by the pin and the guide groove. The positioning pin is engaged with and disengaged from the positioning locking part. Since there is no rocking, the extra space is reduced.

[0006]

[Example] An example will be described with reference to the drawings. Figure 1
As shown in FIG. 2, the indexing device 1 of the present invention is mounted on a processing table 2 of a machine tool such as a machining center. Above the indexing device 1, a main shaft 3 capable of forward and reverse rotation is provided so as to be movable in the XY directions (horizontal directions) and in the Z-axis direction (vertical direction) with respect to the processing table 2 surface. A drive adapter 10 is detachably attached to the lower end of the main shaft 3. The drive adapter 10 has a clutch 11 at its tip that can be engaged with and disengaged from input shafts 4 and 5 for forward and reverse rotation, which will be described later. This drive adapter 10 is held at a predetermined position in the tool magazine while the machining center performs machining on the machining table 2.

The machining center has a so-called rigid tap function as a control function for the main spindle 3, that is, the rotation speed (rotation angle) of the main spindle 3 and the amount of axial movement are synchronized, which is normally used when machining screw holes. A screw hole is machined by moving the integrated tap downward in the axial direction by the thread pitch of the tap per rotation, and when it has been machined to a predetermined depth, it stops and the tap is synchronized in the opposite direction. It has a function to take out the tap from the screw hole by lifting it while rotating it. Therefore, the rotation of the main shaft 3 is the same as when machining threads: when rotating for a right-handed screw, it rotates right, stops, and rotates to the left; when rotating for a left-handed screw, it rotates counterclockwise, stops, and rotates right.

First, the input rotation transmission mechanism 100 between the input shafts 4 and 5 and the indexing table 47 will be explained. In the drawing, 12 is the main body of the indexing device 1, 4 is an input shaft for right-handed screw rotation, and 5 is an input shaft for left-handed screw rotation, which are vertically arranged in parallel with the main body 12 in the front-rear direction. It is freely rotatably supported via a pair of bearings 15, 15, 16, 16 built in the obstruction members 13, 14 which are inserted into the main body 12 so as to be able to reciprocate in the axial direction, and the upper end protrudes outward from the main body 12. There is. These supporting members 13, 14 are connected to the supporting members 13, 14 and the main body 1.
Spring 25, 2 interposed between the stepped hole portions 12a of 2
The input shafts 4 and 5 are urged toward the clutch (upward) by the compressive force of 6.

At the upper end of the protruding portion, as shown in FIG.
8 and 19 are formed. Drive gears 22, 23 are attached to the lower ends of the input shafts 4, 5 via one-way clutches 20, 21. These one-way clutches 20 and 21 rotate a drive gear 22 integrally with the input shaft 4 when the input shaft 4 is rotated to the left, and a drive gear 22 rotates integrally with the input shaft 5 when the input shaft 5 is rotated to the right. 23 rotates, and the respective input shafts 4, 5 rotate idly relative to the drive gears 22, 23 when the respective input shafts 4, 5 rotate in the opposite direction.

Next, each drive gear 22, 2 of the input shaft 4, 5
3 is an orthogonal gear transmission device 30 housed inside the main body 12;
The driven gears 24 below the worm shaft 31 mesh with each other. The worm shaft 31 is rotatably supported within a worm bearing box 36 integrated with the main body 12 via a pair of upper and lower bearings 37 . The driven gear 24 is fitted onto the lower end of the worm shaft 31 via a key 35 so as to be able to reciprocate in the axial direction, and a spring interposed between the driven gear 24 and a stopper 33 attached to the lower end of the worm shaft 31. It is urged upward by 34.

A plate 32 is integrally attached to the lower end of the driven gear 24. Therefore, when one of the input shafts 4, 5 is lowered by the reciprocating motion of the main shaft 3 in the Z-axis direction, the lower ends of the drive gears 22, 23 are engaged with the plate 32, and the driven gear 24 is moved by the spring force of the spring 34. Drive gears 22, 23
It is designed so that it can be pressed down while still being engaged.

[0012] A worm 4 provided in the middle of the worm shaft 31
As shown in FIG.
It is rotatably supported via a bearing 49 built into the main body 12 and a bearing 51 fitted into a bearing box 50 of the main body 12. An indexing table 47 is integrally fixed to the front end of the worm wheel shaft 48, and a clamp plate 53 having a large number of engaging pawls (positioning locking portions) 52 on the outer periphery is integrally fixed to the rear end. In this embodiment, the worm 45 and the worm wheel 46 have a gear ratio such that the worm wheel 46 indexes and rotates 5 degrees with one revolution of the worm 45, and each is positioned at a position where the index table 47 is divided into 72 equal parts. 72 engaging pawls 52 are provided on the clamp plate 53 so that the clamp plate 53 has 72 engaging pawls 52.

Next, the positioning device will be explained. Figure 5
As shown in FIG.
A positioning shaft 55 is inserted into an L-shaped holder 54 fixed to the holder 54 so as to be slidable back and forth in the direction toward the engaging claw 52, and the engaging claw 5 of the clamp plate 53 is attached to the tip of the positioning shaft 55.
A positioning pin 56 that is engaged with and disengaged from the holder 2 is integrally formed with the locating pin 56. Further, a guide groove 57 is cut in the lower surface of the notch at the other end of the positioning shaft 55 in an oblique direction with respect to the sliding direction.

A transmission shaft 60 is further inserted into the holder 54 so as to be reciprocally movable in a direction perpendicular to the positioning shaft 55 and intersecting the input shafts 4 and 5. Transmission is transmitted in the direction of the positioning shaft 55 by a built-in spring 61. The shaft 60 is biased. A pin 58 is attached to one end of the pin 58 with its tip protruding.
The protruding portion 8 is fitted into the guide groove 57 described above. When the transmission shaft 60 is reciprocated, the pin 58 engages with the guide groove 57 of the positioning shaft 55 to move the positioning shaft 55 in the axial direction, and the positioning pin 56 and the engaging pawl 52 of the clamp plate 53 engage and disengage. It's like this.

Further, in FIG. 6, guide pins 62 and 63 are attached to the transmission shaft 60 at positions opposite to both the input shafts 4 and 5, respectively, and the guide pins 62 and 63 are provided at the tips thereof between the support members 13 and 14. It is adapted to engage with grooves 64 and 65. The guide pins 6 of the transmission shaft 60 are provided in the guide grooves 64 and 65.
2 and 63 are supporting members 13 and 14 when the transmission shaft 60 reciprocates.
The guide grooves 64, 65 are continuous with the horizontal groove 66 so as not to come into contact with the guide grooves 64, 65.
, 67 are provided. These guide grooves 64 and 65 guide the guide pins 62 and 63 when either one of the support members 13 and 14 is slid in the axial direction, so that the transmission shaft 60 reciprocates in the axial direction by P. There is.

Next, the correction mechanism of the indexing device 1 will be explained. As shown in FIG. 4, the circumference 2 of the upper end surface of this reciprocating gear 24 is
A pair of protrusions (movement correction members) 40 are protruded toward the worm bearing box 36 side at equally divided positions, and indexing standards are set at the lower end of the worm bearing box 36 built in the main body 12 in correspondence with the protrusions 40. A notch (fixed correction member) 41 that serves as a position is provided, and the protruding piece 40 moves into the notch 4 by the reciprocating movement of the driven gear 24.
1, so that it can be freely connected and detached.

These protrusions 40 and notches 41 are arranged so that when the worm shaft 31 makes exactly one rotation (or an integral multiple thereof), the protrusions 40 and the notches 41 exactly face each other vertically. When the worm shaft 31 is slightly delayed in rotation due to the engagement and delay caused by the internal structure of the one-way clutches 20 and 21, the vertically opposed positions are not accurate. At this time, the protruding piece 40 is moved in the axial direction and engages with the slope 42 of the notch 40 that serves as an index reference, thereby converting the axial movement of the protruding piece 40 into a circumferential movement, thereby delaying the rotation of the worm shaft 31. is corrected to position the worm shaft 31 at an accurate index position.

Next, the operation of the above embodiment will be explained based on explanatory drawings. In the above configuration, the indexing angle θ of the indexing table 47 is
is proportional to the rotation angle of the input shafts 4 and 5. In the machining center's rigid tap function, the rotation angle of the main shaft 3 and its axial movement amount are synchronized, so the input shaft 4,
The input shafts 4 and 5 are rotated by the axial movement amount Z of the main shaft 3 that rotates the input shaft 5.
The rotation angle of the indexing table 47 is determined, and the indexing angle θ of the indexing table 47 is determined.
is decided. That is, the total reduction ratio from the input shafts 4 and 5 of the indexing device 1 to the indexing table 47 is 1/r, the tap pitch P,
When the indexing angle of the indexing table is θ, Z=P×θ×r
/360.

In this embodiment, Z calculated with θ=5 degrees (minimum indexing angle) is the minimum axial movement amount for indexing, and a value that is an integral multiple of this movement amount is used as the indexing angle. The corresponding movement amount Zn is stored in advance in the control device of the machining center. Further, the stroke L1 of the input shafts 4 and 5 required to remove the clamp plate 53 and the positioning pin 56 and then to remove the protruding piece 40 and the notch 41 is also stored in the control device. Therefore, when changing the index angle θ, it is only necessary to change the above-mentioned value Zn, and the setting becomes easy. Furthermore, since the rotation angle of the spindle 3 is controlled extremely accurately by the rigid tap function, there is no need for wiring to detect the index rotation on the indexing device main body side and send the signal to the machine tool side for control.

When performing indexing in such a state, the main shaft 3 rotates the input shaft 4 according to the program input to the control device.
. By the time both clutches 11 and 18 are engaged with each other and the main shaft 3 is lowered to reach the rotation start position R1 shown in FIG.
4 guides the pin 62 of the transmission shaft 60 to move the transmission shaft 60 backward by P in the axial direction. At this time, the pin 63 moves along the lateral groove 67 on the outer periphery of the support member 14 of the other input shaft 5.

The pin 58 at the tip of the transmission shaft 60 guides the guide groove 57 to move the positioning shaft 55 to the left, thereby releasing the lock between the positioning pin 56 and the clamp plate 53. Further, as the input shaft 4 descends, the lower end driving gear 22 comes into contact with the plate 32 and pushes down the driven gear 24.
After the clamp plate 53 and pin 56 are released, the projecting piece 4
0 and the notch 41 are also disengaged, and the driven gear 24 becomes rotatable. When the main shaft 3 reaches the rotation start position R1, the rotation angle and the amount of movement are synchronized and rotated clockwise by the rigid tap function. This rotation also causes the input shaft 4 to rotate clockwise, but due to the action of the one-way clutch 20, the drive gear 22 does not rotate and the indexing table 47 is not indexed.

[0022] If the clutch 11 does not engage,
The input shaft 4 is pushed in by an amount corresponding to the height of the teeth of the clutch 11, but when the main shaft 3 is rotated clockwise, both clutches 11 and 18 are immediately engaged in opposing positions due to this rotation. When the input shaft 4 descends by L1+Zn and reaches R2, the main shaft 3 is stopped by the rigid tap function, and as described above, the rotation angle and the amount of movement are synchronized and the input shaft 4 is rotated to the left and raised. During the axial movement amount Zn until returning to the rotation start position R1, the input shaft 4 is rotated to the left by an amount corresponding to the index angle θ,
This rotation is transmitted to the driving gear 22 via the one-way clutch 20, and the rotation of the driving gear 22 is further transmitted to the worm wheel 46 of the orthogonal transmission device 30 via the driven gear 24, causing the indexing table 47 to index and rotate. let At this time, the other input shaft 5 is rotated at the same time as its drive gear 23 is rotated by the driven gear 24, but there is no support for indexing.

Since the one-way clutch 20 generally has play in its structure, the drive gear 22 has a slight rotation delay with respect to the rotation of the input shaft 4, and naturally the worm shaft 31 also has a rotation delay. As a result, when returning to the rotation start position R1, the protruding piece 40 and the notch 41 do not vertically face each other correctly, but are slightly shifted in the circumferential direction. When the main shaft 3, which has stopped rotating at the rotation start position R1, is further raised, the driven gear 24 is pushed up by the spring 34 biased by compressive force in the axial direction, and the protrusion 40
is rotated in the circumferential direction by the slope of the notch 41 of the worm bearing box 36 and is fitted into the notch 41 which becomes the index reference position, thereby correcting the rotation delay of the worm shaft 31.

After the index table 47 is accurately positioned at the desired index position by this correction, the main shaft 3 further rises and the support member 13, which had been pushed down, is pushed back upward by the compressive force of the spring 25. The positioning pin 56 of the positioning shaft 55 is moved to the right via the transmission shaft 60, the engaging pawl 52 of the clamp plate 53 and the positioning pin 56 are engaged, and the clamp plate 53 is clamped at the index position. In this way, the indexing device 1 is positioned by moving the input shaft 4, the transmission shaft 60, and the positioning shaft 55 in the axial direction, resulting in a compact configuration and less unnecessary space. After the main shaft 3 is further raised and both clutches 11 and 18 are disengaged, the drive adapter 10 of the main shaft 3 is replaced with a tool to be used for the next machining at a predetermined tool exchange position.

When performing index rotation using the input shaft 5, the index table 47 is indexed and rotated in the opposite direction to the direction of rotation by the input shaft 4 by controlling counterclockwise rotation, stop, clockwise rotation, and main shaft rotation. It turns out. By providing the two input shafts 4 and 5 that rotate in opposite directions in this manner, the index rotation angle of the index table 47 can be made 180 degrees or less for each of the input shafts 4 and 5, which has the advantage of allowing shortcut indexing. However, these input shafts 4 and 5 are 1
A book is fine too.

[0026]

[Effects of the Invention] As described above, according to the device of this invention,
The axial movement of the input shaft is converted into the axial movement of the transmission shaft through the pin and guide groove, and the axial movement of the transmission shaft is converted into the axial movement of the positioning shaft through the pin and the guide groove, and the positioning pin is positioned and locked. Since the indexing device is configured to engage and disengage from the indexing device, the extra space can be reduced compared to the case where a swing lever is used, which greatly contributes to miniaturization of the entire indexing device. Furthermore, since the movement of the input shaft is transmitted to the positioning shaft via the transmission shaft, by setting the length of the transmission shaft appropriately, the input shaft can be placed at a position away from the positioning shaft. The shaft can be provided regardless of the position of the positioning shaft.

[Brief explanation of the drawing]

1 shows a detailed view in section along the drive path of the device; FIG.

FIG. 2 is a sectional view taken along line II-II in FIG. 1;

FIG. 3 is a plan view of the clutch.

FIG. 4 is a detailed diagram of the correction mechanism.

FIG. 5 is a detailed sectional view of the positioning shaft.

FIG. 6 is a front view of the device with a portion of the front surface and the cover cut away.

FIG. 7 is an explanatory diagram of the operation of the main shaft.

[Explanation of symbols]

Claims (1)

[Claims] Claim 1: A positioning device for an indexing device in which a positioning pin is engaged with and disengaged from a positioning locking portion integrated with an index table by axial movement of an input shaft, the positioning shaft having a positioning pin at its tip. A transmission shaft intersecting the positioning shaft and the input shaft is provided so as to be reciprocated in the direction toward the positioning locking portion, and the input shaft and the transmission shaft, and the transmission shaft and the positioning shaft. 1. A positioning device for an indexing device, characterized in that the two are connected by a pin and a guide groove, respectively, and the axial movement of the former of each combination is converted into the axial movement of the latter.