JPS6149063B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conveying device that can be applied to an automatic tool storage magazine exchange device, a pallet changer, etc. in a machine tool.

Conventionally, when transporting a tool storage magazine or a pallet with a workpiece attached for replacement in a machine tool, the engaging part of the cylinder rod is engaged with the engagement recess provided in the transported object, and the cylinder is used to transport the transported object. Pushing or pulling objects. Therefore, it is necessary to have a number of cylinders for push/pull operations equal to the number of magazines, pallets, etc. that can be stored in the storage area for magazines, pallets, etc., and a cylinder for attaching and detaching the engagement between the cylinder rod and the conveyed object. At the same time, it was necessary to control these cylinders over time. In addition, separate control means must be provided to accelerate and decelerate at the beginning and end of the conveyance stroke in order to increase the conveyance speed of the conveyed object by the cylinder.

The present invention has been made in view of the above circumstances, and a first object of the present invention is to provide a conveyance device for a machine tool that can carry in and out two objects to be conveyed using one drive source.

A second object of the present invention is to provide a conveyance device for a machine tool that can accelerate and decelerate a conveyed object based on the structure of the conveyance device.

Hereinafter, an example in which a conveyance device according to an embodiment of the present invention is applied to an automatic exchange device for tool storage magazines will be described in detail. 1 to 8 show an embodiment in which the present invention is applied to a machine tool of the type that is a horizontal machining center and has a tool storage magazine above the spindle. The installation position of the tool storage magazine is described as being on the machine tool main body side in the explanation, but it may be selected depending on conditions such as the type of machine or the number of tools, such as the top of the column, the side of the column, or a separate type. The examples are not limited. The embodiment is an example in which one spare tool storage magazine is provided on the magazine storage stand.

As shown in FIGS. 1 and 2, two table guide surfaces 2A and 2 are formed horizontally on the bed 1.
A table 3 is slidably placed on B, and an index table 4 that can be rotated and indexed about a vertical central axis is placed on the table 3. The table 3 is rotated by a screw 6 rotated by a motor 5 attached to the side of the bed 1.
are made to reciprocate and slide along the table guide surfaces 2A, 2B. The table guide surface 2 is placed on the bed 1.
A column 8 is slidably mounted on two column guide surfaces 7A and 7B that are horizontally formed in a direction perpendicular to A and 2B. Screw 1 rotated by motor 9 attached to the side of bed 1
0, the column 8 is caused to reciprocate and slide along the column guide surfaces 7A, 7B.

Two vertical spindle head guide surfaces 11A and 11B are formed on the side surface of the column 8.
A and 11B support a spindle head 12 so as to be slidable in the vertical direction. A screw 14 rotated by a motor 13 attached to the top surface of the column 8 causes the spindle head 12 to move between the spindle head guide surfaces 11A and 11B.
It is made to slide back and forth vertically along. Spindle head 1
2, a main shaft 15 is rotatably supported around a horizontal rotation center axis parallel to the sliding direction of the table 3. The main shaft 15 is provided with a tool insertion hole for removably mounting a tool shank, and a clamp device for pulling and fixing the tool shank mounted in the tool insertion hole into the tool insertion hole.

A magazine support stand 16 is fixed to the upper surface of the spindle head 12, and a magazine A is placed on the upper surface 16A of the magazine support stand 16. The magazine A can be lightly slid on the upper surface 16A of the magazine support stand 16 in a direction parallel to the spindle axis by means of a linear roller bearing 18 attached to the lower surface of the base 17 of the magazine A, as shown in FIG. And as shown in FIG. 2, after being carried onto the magazine support stand 16, it is fixed to the magazine support stand 16. Tool socket 19A (for large diameter tools) attached to magazine A,
19B (for small diameter tools) is removably attached to a chain 21 that is wound in a closed loop around two sprocket wheels 20A and 20B, as will be described later. A tool socket conveying device 22 is provided in front of the upper surface of the magazine support stand 16 and pivots between a vertical position and a horizontal position (parallel to the spindle axis) about a horizontal axis perpendicular to the spindle axis. The tool socket transfer device 22 is located at the tool socket attachment/detachment position of magazine A (X position in Fig. 2).
The tool socket indexed in is removed from the chain 21, rotated to a slightly forward tilted position as shown in Fig. 1, and waited. When machining with the tool attached to the spindle 15 is completed, the tool is placed parallel to the axis of the spindle. Rotate to the exchange position. On the front surface of the magazine support stand 16, between the tool socket conveyance device 22 and the main shaft 15,
A tool changing arm 23 is provided that rotates around an axis parallel to the spindle axis and can move in and out in the spindle axis direction. The tool exchange arm 23 has tool gripping claws 23A and 23B provided at both ends thereof that can be opened and closed.
grips the tool carried on the tool socket transfer device 22 and the tool mounted on the spindle 15, moves forward parallel to the axis of the spindle to extract both tools, and then
After turning 180 degrees, move back parallel to the spindle axis and exchange both tools.

A base 25 of a magazine storage stand 24 is erected at the rear of the bed 1, and a rectangular table 26 is mounted on the base 25. table 26
A spare magazine B, which has the same structure as the magazine A but has a different arrangement of tool sockets, is placed above. 1 and 2 show a state in which the column 8 and the spindle head 12 are positioned at a position to carry out the magazine A to the magazine storage stand 24. FIG.

Next, magazines A, B and magazine support stand 16
The structure of is explained in detail. Since the magazines A and B have exactly the same structure, only the magazine A placed on the magazine support stand 16 will be described. As shown in FIGS. 3 and 4, three linear roller bearings 18 are attached to the bottom surface of the base 17 of the magazine A on the left and right sides, and the entire magazine A is mounted on the top surface 16A of the magazine support base 16 on the main axis. It can be lightly slid in a direction parallel to the axis. Further, a rectangular guide plate 27 is attached to the center of the upper surface of the magazine support stand 16 in parallel with the main shaft axis by approximately the length of the base 17 in the main shaft axis direction. The guide plate 2 is provided on the lower surface of the base 17.
A guide groove 28 parallel to the main shaft axis is formed which closely fits the base 17, and when the magazine A is carried onto the magazine support stand 16, the guide groove 28 of the base 17 fits into the guide plate 27, and the magazine Position A parallel to the spindle axis.

A support shaft 29 is provided upright on the front upper surface of the base 17, and a sprocket wheel 20A is rotatably supported on the support shaft 29 by bearings 30A and 30B. Further, on the rear side of the base 17, a rotating shaft 32 is rotatably provided by bearings 31A and 31B.
is supported, and a sprocket wheel 20B is keyed to the rotating shaft 32. A chain 21 is wound around the two sprocket wheels 20A, 20B in a closed loop in two stages, upper and lower, and the hook pieces 34 of the tool sockets 19A, 19B engage with each head of a chain pin 33 of the chain 21. As a result, a large number of tool sockets 19A and 19B are removably held around the chain 21, and the tool holding interval can be changed in units of link pitches depending on the type of tool inserted into the tool sockets. be.

Next, the positioning means, which is a magazine rotation preventing means for preventing the magazine from shifting its rotational position when replacing the magazine, and for accurately indexing and positioning the magazine, will be described in detail. A casing 35 is attached to the rear of the sprocket wheel 20A on the base 17, and a positioning pin 36 slides in a small diameter guide hole 35A drilled in the casing 35 parallel to the spindle axis. Possibly inserted. The large diameter portion 36A of the positioning pin 36 is inserted into the large diameter hole 35B that is drilled concentrically with the small diameter guide hole 35A, and the positioning pin 36 is always urged in the projecting direction by the compression spring 37, and the positioning pin 36 is The tip of the pin 36 enters the teeth of the sprocket wheel 20A to prevent the sprocket wheel 20A from rotating.

As shown in FIG. 3-A and FIG. 3-B, a pivot 38 is pivotally supported at the lower part of the casing 35, and a lever 39 facing the large diameter hole 35B is provided at the upper end of the pivot 38. is provided. Lever 39
A pin 39A that protrudes upward is provided at the tip of the positioning pin 36, and the pin 39A is fitted into a groove 36B formed in the large diameter portion 36A of the positioning pin 36. Also,
A lever 40 is provided at the lower end of the pivot 38 and is perpendicular to the lever 39. At the tip of the lever 40,
A pin 40A that protrudes below the base 17 is provided.

Next, the second release means which extracts the above-mentioned positioning pin 36 from the teeth of the sprocket wheel 20A and enables rotational indexing of the magazine will be described in detail. On the front lower surface of the magazine support stand 16,
The cylinder 41 is attached, and an engagement member 4 protruding from the upper surface of the magazine support base 16 is attached to the tip of the piston rod 42A of the piston 42, which is slidably inserted into the cylinder 41 in a direction perpendicular to the main shaft axis.
3, and an engagement groove 43A having the same width as the diameter of the pin 40A is formed on the upper surface of the engagement member 43, parallel to the main shaft axis. When the piston 42 is at the backward end, the magazine A is placed on the magazine support stand 16.
When the pin 40A is carried upward, the pin 40A is inserted into the engagement groove 43.
A, and when the piston 42 is moved forward in this state, the levers 40 and 36 pivot clockwise, retracting the positioning pin 36 against the compression spring 37, and removing the positioning pin from the teeth of the sprocket wheel 20A. The tip of 36 comes out and rotation indexing of the magazine becomes possible. To confirm the forward end and backward end of the piston 42, move the dogs D-1 and D-2 attached to the piston rod 42B that protrudes rearward from the cylinder 41, and press the limit switch LS-2.
1 and LS-2.

Next, the drive source for indexing the magazine and the tool calling device will be described in detail. Magazine support stand 1
A motor 44 is attached to the rear lower surface of the motor 44, and a clutch 45 is keyed to the output shaft 44A of the motor 44. The clutch 45 is rotatably supported on the magazine support 16 by a bearing 46. As shown in FIGS. 3-A and 3-C, two parallel clutch pawls 47A and 47B are formed on the upper surface of the clutch 45 and project from the upper surface of the magazine support base 16. Furthermore, clutch pawls 47A, 47B are provided at the lower end of the rotating shaft 32.
A clutch pawl 48 is provided to protrude downward from the base 17 and tightly fits into a clutch groove 47C between the two. When the motor 44 is rotated and the magazine A is called to its original position, the clutch pawls 47A, 4
7B is positioned parallel to the spindle axis as shown in FIG. 3-C, and when the magazine A is carried out from the magazine support stand 16 in this state, the clutch pawl 48 is disengaged from the clutch pawls 47A and 47B. Further, after this, when the spare magazine B is carried onto the magazine support stand 16, the clutch pawl 48 of the magazine B is
It fits smoothly into the clutch grooves 47C of the clutch pawls 47A, 47B, and becomes in a state where the rotation of the motor 44 can be transmitted to the rotating shaft 32 of the magazine B. Further, on the outer periphery of the clutch 45, clutch pawls 47A, 47B are provided.
A positioning groove 49 is formed on the opposite side of the magazine, and when a magazine clamp lever 50, which will be described later, comes to an unclamped state, the tip of the clamp lever 50 fits into the positioning groove 49, and when the magazine is replaced, the clutch is Position it so that 45 does not rotate.

A gear 51 is formed on the outer periphery of the lower end of the clutch 45, and meshes with a gear 53 keyed to an input shaft 52A of a tool calling device (encoder) 52 attached to the rear lower surface of the magazine support 16. The gear 53 of the encoder 52 is set at a gear ratio such that it rotates exactly once for each rotation of the magazine. In the embodiment of the present invention, since the chain 21 has 80 links, the 80 addresses are evolution
It is configured to emit as an electrical signal in decimal code. Therefore, chain pin 3 of chain 21
The tool sockets 19A and 19B installed at appropriate intervals according to the tool 3 are each connected to an encoder 52.
It corresponds to one of the 80 addresses in . Since this correspondence relationship differs depending on the magazine, as will be described later, the correspondence relationship between the address of the encoder 52 and the tool socket number should be stored in a storage means such as PROM, ROM, or RAM, and selected according to the magazine. become.

Next, a clamp device for clamping the magazine onto the magazine support stand 16 will be described in detail. An abutment plate 54 is fixed to the front upper surface of the magazine support stand 16 with bolts, and an inclined surface 54A is formed on the rear surface of the abutment plate 54. The front lower surface of the base 17 has an inclined surface 55 that complements the inclined surface 54A.
A pressing plate 55 with A formed thereon is bolted. Further, a pressing plate 56 that is pressed by a clamp lever 50 is bolted to the rear lower surface of the base 17. The clamp lever 50 is pivotally supported on the magazine support base 16 by a horizontal pivot 57 perpendicular to the main shaft axis. A cylinder 58 is attached to the lower surface of the magazine support stand 16, and a piston 59 is fitted into the cylinder 58 so as to be slidable in parallel with the main shaft axis. piston 59
The piston rod 59A that protrudes rearward has an engagement groove 6 that engages with the lower end of the clamp lever 50.
An engaging member 60 having an 0A is attached, and the reciprocating movement of the piston 59 causes the clamp lever 50 to pivot. In FIG. 3-A, the piston 59 moves back, pivots the clamp lever 50 counterclockwise, presses the pressing plate 56 forward with the tip of the clamp lever 50, and abuts the inclined surface 55A of the pressing plate 55. This figure shows a state in which the base 17 of the magazine A is positioned and clamped with respect to the magazine support stand 16 by pressing strongly against the inclined surface 54A of the plate 54. When the use of the magazine A is completed and the magazine A is to be carried out onto the magazine storage table 24, the piston 59 is advanced and the clamp lever 50 is pivoted clockwise, so that the clamp lever 50 separates from the pressing plate 56 and releases the clamp. At the same time, it fits into the positioning groove 49 of the clutch 45 described above and prevents the clutch 45 from rotating. At this time, the upper end of the clamp lever 50 is
Since it is located at a lower position than the lower surfaces of the pressing plate 56 and the pressing plate 55, there is no problem in carrying in and out the magazine. To check the forward end and backward end of the piston 59,
Dogs D-3 and D-4 attached to piston rod 59B protruding forward from cylinder 58
is performed by detecting the limit switches LS-3 and LS-4 using the limit switches LS-3 and LS-4.

Next, the magazine identification code and magazine detection means will be described in detail. As shown in FIG. 4, a magazine identification dog 61 is attached to the lower surface of the base 17 of the magazine, and when the magazine A is carried onto the magazine support stand 16, the magazine support stand 16
Of the two limit switches LS-5 and LS-6 of the magazine detection means (multi-limit switch) 62 attached to the side of the magazine, one limit switch LS-5 is stepped on to detect that magazine A has been carried in. Then, a magazine detection signal shown in FIGS. 10 and 11, which will be described later, is generated. When the magazine B is carried onto the magazine support stand 16, the dog 61 of the magazine B depresses the limit switch LS-6.

Next, the structure of the magazine storage stand 24 provided with the transport device according to the present invention will be described in detail. As shown in FIGS. 5 to 8, on the upper surface of the table 26 of the magazine storage stand 24, there are two guide plates 63A and 63B on the left and right sides that guide the linear roller bearings 18 on the left and right sides of the lower surface of the magazine when loading and unloading the magazine. One book at a time is attached, and a spare magazine B is placed on the guide plate 63B as shown by a two-dot chain line. The table 26 has four sprocket wheels 64.
A to 64D are rotatably supported, and a chain 65 is wound around the sprocket wheels 64A to 64D in two stages, upper and lower, in a closed loop. The chain 65 is given appropriate tension by a tension pulley 66. The sprocket wheels 64A, 64B are located at both ends of the magazine transport stroke for storing or delivering the magazine, and the sprocket wheels 64C, 64D are located at both ends of the other magazine transport stroke. The chain 65 connects each sprocket wheel 64A to
Since it is engaged with the sprocket wheel 64D at an angle of 90 degrees or more, the sprocket wheel 6
The chain 65, which has reached 4A to 64D, advances while gradually changing its direction.

As shown in FIG. 8, among the four sprocket wheels 64A to 64D, 64A is a driving sprocket wheel. That is, a sprocket wheel 64A is keyed to a rotary shaft 68 which is rotatably supported on the table 26 by bearings 67A, 67B, and an output shaft 69A of a motor 69 attached to the lower surface of the table 26.
It is keyed to the rotating shaft 68 and transmits the rotation of the motor 69 to the sprocket wheel 64A. The chain 65 is integrally connected by a block 71 inserted into a chain pin 70A projecting downward and a block 73 inserted into a chain pin 70B projecting upward. A roller follower 74 is rotatably mounted as an engaging member.

Figure 1, Figure 2, Figure 3, Figure 7-A and Figure 8
As shown in the figure, engagement plates 75A and 75B are attached to the rear end of the base 17 of each magazine so as to extend rearward and engage with the roller followers 74 when the magazine is carried in and out. Engagement plate 75
A, 75B has a roller follower 74 on the bottom surface of the tip.
Engagement grooves 76A, 76B having the same width as the outer diameter dimension of
It is formed in a direction perpendicular to the main shaft axis, that is, in a direction transverse to the direction of the conveyance stroke of the magazine. The roller follower 74 can transmit the movement of the chain 65 on the conveyance stroke to the magazine by engaging with the engagement grooves 76A and 76B, and when the roller follower 74 moves in the lateral direction with respect to the direction of the conveyance stroke, the engagement groove It separates from 76A and 76B. Furthermore, positioning holes 77A and 77B for positioning the magazine on the magazine storage stand 24 are bored in the side surfaces of the engagement plates 75A and 75B.

As shown in FIGS. 1 and 2, when the spindle head 12 and column 8 are positioned at the magazine unloading position by a tape command, the magazine A is unloaded. The height direction of the spindle head 12 is confirmed by the fourth
Dog D-5 attached to the spindle head 12 shown in the figure
This is done by a limit switch LS-7 attached to the side of column 8. Further, confirmation of the left and right direction of the column 8 is performed by a dog D-6 attached to the lower end of the rear surface of the column 8 and limit switches LS-8 and LS-9 attached to the rear surface of the bed 1. The position where the magazine A is carried in and out is the position where the dog D-6 steps on the limit switch LS-8, and the position where the magazine B is carried in and out is the position where the dog D-6 steps on the limit switch LS-9.

At this time, the roller follower 74 is in the position shown in FIG. 5, and the block 72 is the limit switch LS.
It stopped at the position where -10 was pressed. motor 69
When the chain 65 is moved counterclockwise by driving the roller follower 74, the roller follower 74 fits into the engagement groove 76A of the engagement plate 75A of the magazine A. As shown in FIG. 2, the roller follower 74 is connected to the engagement groove 76.
The position where the chain 65 fits into the sprocket wheel 64B is the position where the chain 65 is wrapped around the sprocket wheel 64B, and the roller follower 74 is first inserted into the engagement groove 76A.
Since the roller follower 74 is fitted in parallel to the engagement groove 76A, there is almost no velocity component in the direction of pulling the magazine A onto the table 26 (force in the direction parallel to the spindle axis), and as the roller follower 74 enters the engagement groove 76A,
The speed component in the tensioning direction gradually increases, reaching a maximum speed at a position where the link to which the roller follower 74 is attached becomes parallel to the spindle axis, and thereafter being tensioned at a constant speed.

In this way, the unloading speed of the magazine A gradually increases, so the magazine A is transferred onto the table 26 without impact, and the linear roller bearing 18 on the lower surface of the base 17 guides the table 26 from the upper surface 16A of the magazine support stand 16. It rolls while gradually moving to the plate 63A. Immediately before the magazine A finishes being transferred onto the table 26, the link with the roller follower 74 comes to a position where it engages the sprocket wheel 64A. Therefore, the speed component in the pulling direction of the magazine A onto the table 26 gradually decreases, and when the pulling speed reaches 0, the roller follower 74 moves into the engaging groove 7 of the magazine A.
6A, the magazine A stops on the table 26. The chain 65 continues to move counterclockwise after this, and when the block 72 of the roller follower 74 steps on the limit switch LS-11, the motor 69 stops.

As shown in FIG. 5, FIG. 7-A, and FIG. 7-B, the table 26 is positioned directly above the sprocket wheels 64A, 64D and operates in conjunction with the movement of the roller follower 74. Positioning means 78A, 7 for positioning and fixing the magazine above
8B is provided. Positioning means 78A, 7
8B have exactly the same structure, only one positioning means 78B will be described. Figure 7-A,
As shown in FIG. 7-B, a block 79 is attached to the upper surface of the table 26, and a positioning pin 80 is supported on the block 79 so as to be slidable in a direction orthogonal to the main shaft axis. A pin 81 is driven vertically into the longitudinally intermediate portion of the positioning pin 80, and the lower end of the pin 81 is fitted into a guide groove 82 formed in the block 79 in parallel with the axis of the positioning pin 80. is stopped from rotating.

A pivot pin 83 is also provided on the top surface of the block 79.
is erected, and a lever 84 is pivotally supported on the pivot pin 83. The fork part 85 on the positioning pin 80 side of the lever 84 sandwiches the pin 81, and the width of the fork part 86 on the opposite side of the lever 84 is as follows.
It is formed to have the same outer diameter as the roller follower 74. A steel ball 89 is inserted into a hole 87 vertically bored in the lever 84 and is pressed vertically downward by a spring 88 . Block 7
9 has a notch 90A, into which the steel ball 89 fits.
0B is formed, and the steel balls 89 fit into the notches 90A, 80B at each pivot end of the lever 84, thereby positioning the lever 84 at each pivot end. Figure 7-A shows the positioning hole 77 of magazine B.
The positioning pin 80 is inserted into B, and the table 26
2 shows the position of magazine B. When the chain 65 is moved counterclockwise in order to carry the magazine B from the table 26 onto the magazine support stand 16 of the machine tool, the roller follower 74 moves to the bifurcated portion of the lever 84, as shown in FIG. 7-A. 8
6, pivot the lever 84 counterclockwise, and pull out the positioning pin 80 from the positioning hole 77B. When the lever 84 pivots to the position shown by the two-dot chain line, the positioning pin 80 is inserted into the positioning hole 77.
The magazine A is now movable, and the roller follower 74 is completely removed from the lever 84.
It comes off from the bifurcated part 86 of. At this time, the steel ball 89 fits into the notch 90B and positions the lever 84 on the block 79. When the positioning of the lever 84 is completed, the roller follower 74 fits into the engagement groove 76B of the magazine B, and pushes the magazine B out of the table 26 while gradually accelerating it. vice versa,
When pulling the magazine B onto the table 26, the chain 65 moves clockwise,
The magazine B is pulled onto the table 26, and while the speed is gradually reduced near the end, the roller follower 74 is pulled out from the engagement groove 76B when the speed reaches 0.
Subsequently, the roller follower 74 enters the bifurcated portion 86 of the lever 84 located at the two-dot chain line position, and the lever 84
4 clockwise and insert the positioning pin 80 into the positioning hole 77B. roller follower 7
4 moves until it is removed from the bifurcated portion 86 of the lever 84, the positioning pin 80 is completely fitted into the positioning hole 77B, and the magazine B is positioned on the table 26. At this time, the steel ball 89 of the lever 84 fits into the notch 90A, positioning the lever 84 on the block 79. Therefore, even when the magazine A is pulled onto the table 26 as described above, the roller follower 74 acts on the positioning means 78A at the end position of the pulling to position the magazine A on the table 26. do.

As mentioned above, when the ejection operation of magazine A is completed and the limit switch LS-11 is stepped on,
The column 8 moves to the position where the magazine B is loaded onto the magazine support stand 16 according to the tape command, and the loading operation of the magazine B is started in response to a confirmation signal from the dog D-6 stepping on the limit switch LS-9. That is, the motor 69 is driven to move the chain 65 counterclockwise, and as described above, the roller follower 74 first acts on the positioning means 78B to extract the positioning pin 80 from the positioning hole 77B of the magazine B, and then The roller follower 74 fits into the engagement groove 76B, and the magazine B
is pushed out from the table 26 while gradually accelerating, and carried onto the upper surface 16A of the magazine support stand 16.

Near the end of loading, the link with the roller follower 74 engages with the sprocket wheel 64C, so the loading speed of magazine B is gradually reduced, and at the position where loading of magazine B is completed, the loading speed of magazine B is 0. Became a roller follower 7
4 comes off from the engagement groove 76B of magazine B. Chain 65 continues to move counterclockwise after this,
When block 72 of roller follower 74 steps on limit switch LS-12, motor 69 stops.

The loading/unloading operation of the magazine is now complete, and the clamp lever 50 mentioned above is mounted on the magazine support stand 16.
After clamping magazine B, the machine tool moves to the position where the next machining will be performed, and
Machining is performed using tools stored in the machine.

The conveyance device described above as a mechanism for exchanging magazines between the machine tool body and the magazine storage table is effective not only for exchanging magazines, but also for other exchange mechanisms such as pallet changers. be.

As described above, the magazine is provided with a magazine rotation blocking means to prevent the rotational index position of the magazine from shifting when the magazine is carried in and out. 2
In order to freely index the magazine pulled in above the tool 4 and exchange old and new tools, a first release means is provided for releasing the magazine rotation blocking means.

As shown in FIG. 5, FIG. 6-A, and FIG. 6-B, a first release means 91A for the magazine A is provided on the left and right sides of the table 26 of the magazine storage stand 24.
A first release means 91B for magazine B is provided. Since the first release means 91A and 91B have almost the same structure, FIG.
A, the first release means 91A shown in FIGS. 6-B will be explained in detail. The table 26 has a pivot 9
2 is pivotally supported, and at the lower end of the pivot 92,
A manual lever 93 that protrudes from the side surface of the table 26 is attached. The manual lever 93 is constantly pulled counterclockwise by a tension spring 94, and a lever 95 is attached to the upper end of the pivot shaft 92.

As mentioned above, the positioning pin 36 shown in FIGS. 3-A and 3-B, which is a magazine rotation preventing means and a magazine positioning means, is connected to the compression spring 37.
The sprocket wheel 20A is constantly inserted into the teeth of the sprocket wheel 20A, preventing the magazine from rotating, and the magazine cannot be rotated at all times, not only during loading and unloading operations of the magazine, but also after the magazine is drawn into the table 26. It's structured. As described above, when the use of the machine tool is completed and the magazine A is pulled onto the table 26 and the magazine B is carried into the machine tool body, the worn tools stored in the magazine A are replaced or the tools are replaced. Since it is necessary to change the socket arrangement, use the manual lever 93 described above.
The tool will be replaced while rotating the magazine A by hand. That is, Fig. 6-
As shown in B, when the manual lever 93 is turned clockwise, the lever 95 hits the pin 40A of the lever 40 on the positioning pin 36 side, and the levers 40 and 3
9 pivots clockwise and moves the positioning pin 36 backward against the compression spring 37, so that the tip of the positioning pin 36 comes out of the teeth of the sprocket wheel 20A, allowing the magazine to rotate. After rotating the magazine A by hand and indexing the tool socket that needs to be replaced to a position where it can be easily replaced, if you let go of the manual lever 93, the tension spring 94 will return the manual lever 93 and the lever 95 to their original positions. Then, the positioning pin 36 enters the teeth of the sprocket wheel 20A again by the spring force of the compression spring 37, and prevents the magazine A from rotating. In this state, replace the tool or tool socket that has been indexed to a position where it can be easily replaced, and repeat the above-mentioned replacement operation. When all the tools that require replacement have been replaced, the encoder 52 and the magazine A are replaced as described above. In order to align the magazine A with the ejected position, index the magazine A to its original position, release the manual lever 93, and insert the positioning pin 36 into the teeth of the sprocket wheel 20A to prevent the magazine A from rotating. Prepare for the next magazine A replacement operation. Regarding the magazine, the above-described tool exchange operation can be performed in the same manner as in the case of magazine A. In the embodiments described above, the first release means 91A, 91B are operated manually, but they can also be operated automatically using a power drive source.

FIG. 9 is a hydraulic circuit diagram for operating the tool storage magazine automatic exchange device described above. The motor 69 is rotated in forward and reverse directions by a four-port, three-position solenoid valve 96, and drives the chain 65 when loading and unloading the magazine. The chain 65 is stopped using the solenoid valve 9.
This is done by setting the motor 69 to the all-port block in a neutral state and stopping the motor 69. The reciprocating motion of the piston 59 that operates the clamp lever 50 is
This is done by switching a solenoid valve 97 with 4 ports and 2 positions. Place the magazine on the magazine support stand 16
In order to clean the abutment plates 54 and 55A when the abutment plates 54 and 55A are brought in, an air nozzle 98 is installed on the abutment plate 54 on the inclined surface 5.
By switching a two-port, two-position solenoid valve 99 provided with an opening at 4A, air is blown onto the inclined surfaces 54A and 55A to clean them when the magazine is loaded.

Next, a description will be given of a tool calling device in which tool numbers are arbitrarily set according to the tool arrangement of magazines carried into the magazine support stand 16, and are arbitrarily selected according to the type of magazine. 1st
Figure 0-A and Figure 10-B are used as storage means.
This shows an example using PROM or ROM. The NC tape 100 is read by the NC device 101, and in order to call the tool socket designated by the NC tape 100 to the tool socket attachment/detachment position X, the motor 44 is driven via the magazine rotation control circuit 102 to rotate the magazine. drive When the magazine rotates, the encoder 52 emits the addresses 00 to 79 as electrical signals in binary coded decimal code corresponding to the links in the chain 21 of the magazine.
Compare it with the tool socket number in ROM104.

As mentioned above, the magazine is mounted on the magazine support stand 16.
When the magazine is carried in, the magazine detecting means 62 determines whether the carried magazine is an A magazine or a B magazine. That is, when magazine A is carried in, limit switch LS-5 is stepped on, and a 0 signal is issued to the most significant bit 80 of decoder 103. When magazine B is carried in and limit switch LS-6 is depressed, decoder 103 is output. A signal of 1 is issued to the most significant bit 80 of . Therefore, if magazine A is being carried in,
00 of the storage area of PROM or ROM104
It is compared with the stored contents of the conversion memory for magazine A up to 79. Further, when magazine B has been carried in, the stored contents of magazine B conversion memories 80 to 159 are compared.

00 is stored in the conversion memory for magazine A, corresponding to the arrangement of tool sockets stored in magazine A.
The correspondence between addresses 80 to 79 and tool sockets is stored, and the magazine B conversion memory stores addresses 80 to 159, corresponding to the arrangement of tool sockets stored in magazine B. The correspondence relationship with the tool socket is stored.

Therefore, for example, magazine B is mounted on magazine support stand 1.
6, and when the NC tape 100 issues a command to call the tool socket No. 1,
When magazine B rotates and the encoder 52 outputs a signal of address 01, the decoder 103 outputs 81.
The address signal is output and compared with the contents stored at address 81 in the magazine B conversion memory. Since the number 1 tool socket is stored at address 81 in the conversion memory for magazine B, PROM or ROM104
A signal indicating that tool socket No. 1 is called is outputted to the comparison circuit 105, and the comparison circuit 105 issues a signal that matches the output from the NC device 101, and the motor 44 is activated via the magazine rotation control circuit 102. When stopped, the No. 1 tool socket of magazine B is indexed to tool socket attachment/detachment position X. If the arrangement of the tool sockets in magazine A or magazine B is changed from the tool arrangement shown in FIG. In the case of ROM, the ROM itself can be replaced with one with different memory contents. In the above explanation,
The storage area of one PROM or ROM 104 is divided to correspond to multiple magazines, but one
If the number of tools stored in a magazine is large, install PROM or ROM for the number of magazines,
The PROM or ROM corresponding to the magazine carried into the magazine support stand 16 may be selected.

FIG. 11 shows an example in which RAM is used as the storage means. The computer 106 includes
Corresponding to the tool arrangement of a plurality of magazines A to N, a correspondence relationship between the address of the encoder 52 and the tool socket number is stored, and when a required magazine is carried into the magazine support stand 16, the interface 107 The stored contents of the tool array corresponding to the loaded magazine of the computer 106 are written into the RAM 108 via the computer 106. The tool calling operation is the same as in the case of the PROM or ROM described above, and the address output from the encoder 52 is input to the RAM 108 via the decoder 103.
The RAM 108 compares the address of the encoder 52 with the tool socket number, and the comparison circuit 105 compares it with the commanded tool number from the NC device 101 to control the motor 44 via the magazine rotation control circuit 102.

The two examples above are both cases where the position of the tool in the magazine is fixed using a fixed number system, but in the case of RAM, an address rewriting system is also possible where the position of the tool changes with the tool exchange operation. be. That is, an address rewriting control circuit 109 shown by a broken line in FIG. 11 is installed. The address rewriting control circuit 109 stores the number of the tool in use that is attached to the spindle 15, and when the magazine is indexed and the next tool to be used is called up, the tool changer is used to replace the tool with the spindle 15. When the old and new tools are exchanged with the magazine, the address rewriting control circuit 1
Step 09 rewrites the currently called tool address in the RAM 108 to the tool address installed on the spindle.
In this way, the RAM is
If you rewrite the memory contents of the magazine support stand 16
When the use of the magazine placed in the magazine is completed, the tool arrangement at that time is stored in RAM 108, so when replacing the magazine,
8 is transferred to the computer 106. When the same magazine is carried into the magazine support stand 16 and used again, the computer 10
6 can be written to the RAM 108.

The present invention is not limited to the configurations shown in the embodiments, and modifications are expected without departing from the technical idea of the present invention as described in the claims.

As is clear from the above explanation, the conveyance device of the present invention moves forward and backward along a guide surface between a base provided close to a machine tool and the machine tool main body on the base, and A movable body that moves relative to the guide surface on the machine tool body perpendicular to the plane, and a rotatable closed loop structure consisting of a straight line portion and an arcuate portion parallel to the locus of movement of the movable body on the base. a chain driving body, a driving source provided on a base for rotating the chain driving body, and a drive source connected to the chain of the chain driving body and integrally connected to the chain between the forward position and the retracted position of the movable body. It consists of a moving engaging body and an engaged member that is provided at the rear of the movable body and allows engagement with the engaging body from a direction perpendicular to the guide surface of the movable body. By driving in forward and reverse directions using a drive source, unloading and loading in each transport process can be performed. Therefore, the drive system can be simplified and there is no need for control to operate a plurality of drive sources corresponding to individual objects to be transported over time. In addition, when the chain engages with the sprocket wheel from the conveyance stroke, it progresses while gradually changing its direction, so that acceleration and deceleration can be performed at both ends of the conveyance stroke. does not require Therefore, no impact is applied to the transported object at the beginning and end of transport,
Further, the conveyance speed during the entire conveyance process can be increased. As described above, the present invention provides excellent effects as a conveying device for storage areas such as tool storage magazines and pallets.

[Brief explanation of the drawing]

Fig. 1 is an overall front view of an automatic tool storage magazine changing device to which the conveying device of the present invention is applied, Fig. 2 is an overall plan view, and Fig. 3-A is an overall front view of an automatic tool storage magazine exchange device to which the conveyance device of the present invention is applied. 3-B is a cross-sectional view of the magazine rotation prevention means shown in FIG. 3-A; FIG. 3-C is a plan view of the clutch 45;
Fig. 4 is a side view showing the spindle head, Fig. 5 is a plan view of the magazine storage stand equipped with a conveyance device, and Fig. 6-
A is a longitudinal cross-sectional view showing the magazine pulled in onto the magazine storage table, FIG. 6-B is an explanatory diagram explaining the operation of the first release means, and FIG. 7-A is a view showing the magazine positioning means. A partially sectional plan view,
Fig. 7-B is a view taken along arrow A-A in Fig. 7-A, Fig. 8 is a vertical sectional view of the sprocket wheel on the driving side, and Fig. 9 is a view of the sprocket wheel for driving the automatic tool storage magazine changing device. Hydraulic circuit diagram, Figure 10-A and Figure 10-
B is a block diagram of a tool calling device using PROM or ROM, and FIG. 11 is a block diagram of a tool calling device using RAM. In the figure, 12... spindle head, 15... spindle,
16... Magazine support stand, 17... Base, 24
... Magazine storage stand, 36 ... Positioning pin, 4
DESCRIPTION OF SYMBOLS 1... Cylinder, 42... Piston, 43... Engaging member, 44... Motor, 45... Clutch, 5
0... Clamp lever, 52... Encoder, 6
1... Dog, 62... Magazine detection means, 64
A~64D... Sprocket wheel, 65...
Chain, 69...Motor, 74...Roller follower, 75A, 75B...Engagement plate, 76A, 76
B...Engagement groove, 78A, 78B...Positioning means, 91A, 91B...First release means, 103
...decoder, 104 ...PROM or ROM,
108...RAM, 109...Address rewriting control circuit.

Claims (1)

[Claims] 1. Moves back and forth along a guide surface between a base provided close to the machine tool and the machine tool body on the base, and moves perpendicularly to the guide surface on the machine tool body against the guide surface. a movable body that moves relative to the movable body; a rotatable chain drive body arranged in a closed loop on a base and consisting of a straight line portion and an arcuate portion parallel to the locus of movement of the movable body; and a rotatable chain drive body that rotates the chain drive body. a drive source provided on the base to move the chain; an engaging body coupled to the chain portion of the chain drive body and moving integrally with the chain between forward positions and backward positions of the movable body; and an engagement body provided at the rear of the movable body. and an engaged member that allows engagement with the engaging body from a direction perpendicular to the guide surface of the movable body, which is perpendicular to the guide surface on the base of the movable body carried into the machine tool main body. the engaged member at the rear of the movable body engages with the engaging body in the forward position,
A conveyance device for a machine tool, characterized in that the drive source moves an engaging body provided on a chain drive body to carry the chain drive body to a retracted position.