JPS6310907Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a tool breakage detection device in a tool changer in which a tool magazine and a spindle head are brought close to each other so that tools can be directly exchanged between them.

Conventional technology and its problems Conventionally, in machine tools such as machining centers equipped with the above-mentioned tool change device, for example, a breakage detection device is installed in parallel with the jig on which the workpiece is placed, and the Before replacement, the tool attached to the spindle head is checked by the breakage detection device to detect tool breakage. However, according to this method, tool breakage is detected completely separately from tool replacement, which takes time.

Purpose and Overview In view of the problems of the prior art, the present invention attempts to shorten the time required for tool exchange and tool breakage detection by detecting tool breakage at the same time as tool exchange. When the tool is directly exchanged at the tool loading/unloading position, the magazine body, which rotates and indexes the tool, and the spindle head are moved in close proximity to each other. move the parts,
This movement causes the detection lever to swing, thereby moving the detector at its tip from a non-contact position where it does not come into contact with the tool to a contact position where it makes contact with the tool.

Embodiment In FIGS. 1 to 3, 1 is a magazine body, a face plate 3 is fixed to the front side (left side in FIG. 2) of the intermediate cylinder member 2, and a split plate 3 is fixed to the rear side (right side in FIG. 2). A Geneva wheel 4 for taking out is attached.
The magazine body 1 is rotatably supported via bearings 7, 7 on a pivot support shaft 6 fixed to a support 5 that moves forward and backward. The face plate 3 has a plurality of (six in this embodiment) arc-shaped notches 8 on its outer periphery.
...is formed. These arcuate notches 8...
Tool holders A... are arranged corresponding to the tool holders A. In this tool holder A, reference numerals 9, 9 denote a pair of gripping claws, and the gripping claws 9, 9 are disposed on the back surface of the face plate 3 with an arc-shaped notch 8 in between.
The intermediate portion is supported by pins 0 and 10 and is designed to swing. Presser rollers 11, 11 are rotatably supported at the tips of the gripping claws 9, 9, and
A compression spring 12 is interposed between the opposing rear end portions and biases the tips of the gripping claws 9 in a direction to close them. Furthermore, a positioning member 14 having a positioning key 13 for positioning the tool T is fixed between the gripping claws 9, 9. 15, 15 are stoppers that prevent the tips of the gripping claws 9, 9 from being closed too much by the compression spring 12 when the tool T is not gripped between the gripping claws 9, 9; The opening is maintained at a level that allows for smooth installation when the device is installed between the 9 spaces.

Next, reference numeral 16 is a hollow guide body attached to the surface of the face plate 3 corresponding to the arcuate notch 8. Inside this guide body 16, a sliding shaft 17, which is illustrated as a moving member, is mounted in the axial direction. It is fitted so as to slide a predetermined amount, is prevented from rotating by a rotation stopper pin 18, and is normally positioned at the rearward end position by a spring 19. This sliding shaft 17 has protruding portions 9a, 9 of the gripping claws 9, 9 when in the rearward end position.
a, and prevents the tips of the gripping claws 9, 9 from opening, thereby ensuring that the gripping state of the tool T installed between the gripping claws 9, 9 is locked at any position other than the tool attachment/detachment position. A portion 17a is formed, and the sliding portion 17
When the gripper is at the forward end position, the large diameter portion 17a and the protruding portions 9a, 9a are out of correspondence, and the tips of the gripping claws 9, 9 are opened. A guide ring 2 is provided at the rear end of the sliding shaft 17 so as to be rotatable in the radial direction of the face plate 3.
0 is pivoted. An L-shaped bracket 21 is fixed to the front end of the sliding shaft 17, and one end of a link member 22 is rotatably supported at the tip of the bracket 21 by a pin 23. The tip of the pin 25 is attached to one end of the detection lever 24.
connected by. The detection lever 24 includes a singing member 26 and a swinging arm 2 formed of an insulator.
7, a support member 28 that swingably supports the swing arm 27, a spring 29 that always biases the swing arm 27 in the direction of contact with the tip of the tool T, and the swing arm 2.
7 and a stopper rod 30 for positioning. A detector 31 is installed at the tip of the swinging arm 27.
is fixed, and the middle portion of the swinging member 26 is attached to an annular bracket 1 fixed to the front side of the magazine body 1.
It is supported by a pin on a support bracket 32 fixed to a. Further, 33 is a spindle head that rotatably supports the spindle 34, and 35 is a cam attached to the front surface of the spindle head 33. This cam 35 is arranged so that the spindle head 35 and the magazine body 1 are close to the tool attachment/detachment position shown in FIG. When the sliding shaft 1 is engaged with the guide ring 20 of the sliding shaft 17,
7 is moved from the backward end position to the forward end position, and by this movement to the forward end position, the detector 31 at the tip of the detection lever 24 detects the tip of the tool T held in the tool holder A shown in FIG. It moves from a non-contact position N1 where it does not touch to a contact position N2 where it contacts.

A stud bolt 3 is attached to the annular bracket 1a.
6 is fixed via a bracket 37, and arms 39, 39 each having a carbon brush 38 at its tip are rotatably supported by the stud bolt 36 via an insulator 40. Reference numeral 41 denotes a conduction pin fixed to the tip of a bracket 42 fixed to the tip of the swing support shaft 6 through an insulator 43 so as not to rotate.The carbon brushes 38, 38 at the tips of the arms 39, 39 The arms 39, 39 are urged by a spring 44 to close their tips so as to come into sliding contact with the outer periphery of the conduction pin 41. The terminal 45 of the arm 39 and the detector 31 are electrically connected by a cord 46, and the terminal 47 at the lower end of the conductive pin 41
is connected to a tool breakage detection circuit (not shown), and tool breakage is detected when the detector 31 does not touch the tip of the tool T.

After completing the predetermined machining, the spindle head 33 moves close to the magazine body 1 in order to attach the tool T to the empty tool holder A. First, the cam 35 fixed to the spindle head 33 engages with the guide ring 20 at the rear end of the sliding shaft 17 to move the sliding shaft 17 to the forward end position. The tool T mounted on the main shaft 34 engages with the presser rollers 11, 11, pushes the gripping claws 9, 9 apart, and is attached to the gripping claws 9, 9. be done. At this time, as the sliding shaft 17 moves to the forward end position, the detection lever 24 swings via the bracket 21 and the link member 22, and the detector 31 at the tip of the detection lever 24 moves from the non-contact position N1 to the contact position. N
2, if the tip of the tool T mounted on the tool holder A is not broken, it is detected by contacting it, and if it is broken, the breakage of the tool T is detected without contacting it.
When the tool T is attached to the tool holder A from the main shaft 34 in this way, the magazine main body 1 moves forward and extracts the tool T from the main shaft 34.The tool T to be used next is indexed by the known Geneva mechanism 50, and the magazine main body 1 is Move the tool T back to the spindle 34 at the tool removal position.
Attach to. At this time, the sliding shaft 17 reaches the forward end position from the state in which the new tool T is locked at the backward end position, and the detector 31 reaches the contact position where it contacts the tip of the tool T as described above, thereby preventing the new tool T from breaking. To detect. Then, the spindle head 33 separates from the magazine body 1 and moves on to the next processing.

In the present invention, since the sliding shaft 17 that locks the gripping state of the tool holder A is also used as a moving member, there is no need to provide a separate moving member, but it is not necessary to provide a separate moving member. Also,
Although the cam 35 is attached to the tip of the spindle head 33 and engaged with the sliding shaft 17, the sliding shaft 17 may be directly moved by the tip of the spindle head 33. Furthermore, instead of swinging the detection lever 24 by the sliding shaft 17, a lever such as a lever is used, and the detection lever 24 is caused to swing by the movement of the spindle head 33 and the magazine body 1 toward each other. Good too. Furthermore, one end of the detection lever is extended backwards,
This extended portion may be used as a moving member.

Effects As described above, the present invention allows the movable members of the magazine body to be moved closely between the magazine body and the spindle head when the tools are directly exchanged at the tool loading/unloading position by moving the magazine body and the spindle head close together. This movement causes the detection lever to swing and move the detector at its tip from a non-contact position to a contact position where it can contact the tip of the tool gripped by the tool holder. Tool breakage can be detected at the same time as the tool is exchanged with the spindle, and tool breakage detection takes less time compared to conventional methods in which tool change, tool exchange, and tool breakage detection are separate processes. Not only can the length be shortened, but also the spindle head movement control for detecting tool breakage can be omitted.

[Brief explanation of drawings]

FIG. 1 is a front view of the tool magazine with some parts omitted, FIG. 2 is a side view showing a partial cross section of FIG. 1, and FIG. 3 is a view taken along the line II in FIG. 2. A...Tool holder, T...Tool, 1...Magazine body, 17...Sliding shaft, 24...Detection lever,
31...Detector, 33...Spindle head, 34...Spindle, N1...Non-contact position, N2...Contact position.

Claims (1)

[Scope of utility model registration request] The magazine body, which is equipped with multiple tool holders and holds tools so that they can be rotated and indexed, and the spindle head, which rotatably supports the spindle, are placed relatively close to each other during tool exchange, and tools can be directly exchanged between them. In the tool changer, the magazine body has a contact position where the detector at the tip can come into contact with the tip of the tool held by the tool holder, and a contact position corresponding to at least one tool holder. A detection lever supported to swing between non-contact positions and a moving member that engages and moves with the spindle head when the magazine body and spindle head approach the tool attachment/detachment position is provided. A tool breakage detection device characterized in that the moving member and the detection lever are linked so that the detector moves to a contact position as the spindle head approaches.