JPH07227706A - Tool unclamping device - Google Patents

Abstract

PURPOSE:To prevent a main spindle from being rotated at the time of a pin being push-pressed by means of a two-way lever, even when the main spindle is not stopped accurately at fixed position stop. CONSTITUTION:A main spindle motor M is connected to the end of a main spindle 3, and a pin 13 is made to penetrate in right-angle crossing from a 3A, 3A hole opened at the middle portion of the main spindle 3, and the form of the pin 13 which is fixed at a clamp bar 8 in right angle crossing is made to be a push-pressing form to the main spindle tip side by means of a two-way lever 15 driven by means of a cylinder 14 or the like, and a ring body 20 is fixed at both ends of the pin 13 in the state of being idly put on the middle portion of the main spindle 3, and the clamp bar 8 is pushingly moved by push- pressing the ring body 20 by means of a pushing portion 15B provided at the two-way lever 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an unclamping device for a tool (tool) mounted on a spindle of a machine tool, which prevents the spindle from accidentally rotating when the tool is unclamped.

[0002]

2. Description of the Related Art Conventionally, in an unclamping device for a tool mounted on a spindle of a machine tool, when a spindle motor is connected to a gear fitted in an intermediate portion of the spindle length by a gear train of several stages, It is a method of pressing the tail end of the clamp bar protruding from the end of the spindle. When the spindle motor is connected to the end of the spindle, the pin is orthogonally penetrated through a hole made in the middle of the spindle, and the pin, which is fixed orthogonally to the clamp bar, is attached to the spindle by a bifurcated lever that acts on a cylinder or the like. It is a pressing method to the tip side.

[0003]

In the unclamping device of the above tool, when the spindle motor is connected to the spindle end, the pin is orthogonally penetrated through the hole formed in the intermediate portion of the spindle and orthogonally fixed to the clamp bar. However, there are the following problems in the method of pressing the pin toward the tip side of the main shaft with a bifurcated lever that acts on a cylinder or the like. That is, usually, the main spindle performs the old and new tool exchange operation while stopped at a fixed position, but when removing the tool of the main spindle by manual operation, if the main spindle does not stop accurately at the fixed position, the bifurcated lever is used. When the pin is pressed, the main shaft is rotated, and due to the hand supporting the tool, careless rotation may cause serious injury.

According to the present invention, a spindle motor is connected to a spindle end,
In the method of pressing the pin to the tip side of the spindle with a bifurcated lever that drives the pin orthogonally through a hole drilled in the middle of the spindle and is fixed to the clamp bar orthogonally,
An object of the present invention is to provide a tool unclamping device which prevents the main shaft from being rotated when the pin is pressed by the bifurcated lever even when the main shaft is not exactly stopped at the fixed position.

[0005]

According to the present invention, in order to achieve the above object, a spindle motor is connected to a spindle end, a pin is orthogonally penetrated through a hole formed in an intermediate portion of the spindle, and is orthogonally fixed to a clamp bar. In a method of pressing this pin to the tip side of the main shaft by a bifurcated lever driven by a cylinder or the like, ring bodies are attached and fixed to both ends of the pin in a state of being loosely engaged with the intermediate portion of the main shaft, and attached to the bifurcated lever. The tool unclamping device is characterized in that the pressing body presses the ring body to move the clamp bar.

Further, the present invention is to achieve the above object.
A spindle motor is connected to the spindle end, a pin is orthogonally penetrated through a hole opened in the middle of the spindle, and the pin is orthogonally fixed to the clamp bar.The pin is pushed to the spindle tip side by a bifurcated lever driven by a cylinder, etc. A ring body is pivotally attached to a predetermined position of the bifurcated lever facing the pin so that the ring body can be swung freely.
This ring body is a tool unclamp device characterized in that the clamp bar is pushed in a state of pressing both ends of the pin in a state of being loosely fitted to the intermediate portion of the main shaft.

[0007]

According to the present invention, the operation of exchanging the old and new tools mounted on the main shaft is performed through the ring body fixed to the pin or the ring body pivotally attached to the bifurcated lever while the main shaft is stopped at a fixed position. By pressing the pin to move the clamp bar, the rotation of the main shaft is eliminated and the operation is performed securely and reliably. Then, when removing the tool of the spindle by manual operation, even if the spindle is not exactly stopped at the fixed position, it is performed via the ring body when pressing the pin with the bifurcated lever, so the spindle is rotated. The clamp bar can be pushed without using the tool, and the tool supported by the hand can be safely removed from the spindle while the tool is completely stopped.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments shown in the drawings will be described below. Figure 1
4 to 4 show the tool unclamping device 10 of the present invention. First, in FIG. 1, the spindle head 1 of the machine tool is
A spindle 3 is provided at the tip following the lower end small diameter portion 2, and various tools 4 are exchangeably mounted in a tapered hole 3A of the spindle by a tool exchanging device (not shown). The main shaft 3 is rotatably supported by a plurality of bearings 5 ... In the vicinity of the tip side and the middle thereof, and the tail end of the main shaft 3 is connected to a rotary shaft 7 of a main shaft motor M via a universal joint 6. There is.

A pull bar 9 of a tip end of a clamp bar (drawing bar) 8 for inserting a collet 11 of a tool 4 mounted in the tapered hole 3A of the spindle 3 into the hollow portion of the spindle.
However, the disc spring 12 laminated on the tail end side pulls in and strongly clamps. Tool unclamping device 1 of the present invention
0 connects the pin 13 to the tail end 8A of the clamp bar 8
It is orthogonally fixed via B. Both ends of this pin 13
A ring body 20 that is orthogonally penetrated through holes 3B, 3B formed in the middle portion of the main shaft 3 and is fitted to both ends of the pin 13.
Is pushed toward the main shaft tip side by a bifurcated lever 15 driven by a piston rod 16 such as a cylinder 14 via a connecting tool 17.

That is, as shown in FIGS.
The ring bodies 20 are attached and fixed to both ends of the pin 13 in a state of being loosely engaged with the middle portion of the pin 13, and the two left and right pushing portions 15A and 15B attached to the middle lower surface of the bifurcated lever 15 form a predetermined gap X. Remaining facing the left and right upper surfaces of the ring body. Then, as shown in FIG. 4, the ring body 20 is pressed by the forked lever 15 connected to the piston rod 16 such as the cylinder 14 to move the clamp bar 8 toward the tool 4 side to unclamp the tool 4. Has become.

The structure of the tool unclamping device 10 of the present invention is as described above, and operates as follows. First,
The old and new tool exchange operations of the main shaft 3 are performed by pressing the ring body 20 toward the tool 4 with the pressing portions 15A and 15B attached to the forked lever 15 while the main shaft 3 is stopped at a fixed position. By pushing the bar 8, the pull stud disconnects from the collet, and the tool 4 projects from the tapered hole 3A.

Then, when the tool 4 of the spindle 3 is manually removed, the ring body 20 connected to the pin 13 is pushed by the bifurcated lever 15 even if the spindle 3 is not accurately stopped at the fixed position. When the main shaft is not rotated,
The clamp bar 8 can be pushed toward the tool 4 side to unclamp the tool 4, and the tool 4 supported by the hand can be safely withdrawn from the spindle 3.

The above-described operation is performed by inserting the tool 4 into the taper hole 3A and inserting and mounting the new tool into the taper hole. Done.

It is needless to say that the present invention is not limited to the above-mentioned respective embodiments, and that design changes can be further made within the scope of the invention. For example, as shown in FIG.
The mounting position of the two forked levers 15 of the bifurcated lever 15
It is also possible to pivotally change the A and 15B so that they can be swung so that both ends of the pin 13 are pushed toward the tool 4 on the lower surface of the ring body 20.

According to this embodiment, even if both ends of the pin 13 are pushed toward the tool 4 by the lower surface of the ring body 20 in a state where the main shaft 3 is not stopped at a fixed position, the ring body 20 can be pushed. Always balances in a horizontal posture (perpendicular to the tool direction), and no action force for rotating the spindle 3 is generated.

[0016]

[Effects] According to the present invention, as described above, even if the main shaft does not stop accurately at the fixed position, the main shaft rotates by pressing the pin through the ring body when pressing the pin with the forked lever. The clamp bar can be pushed without being pushed, and there is an effect that the tool supported by the hand can be safely pulled out from the spindle while the tool is completely stopped.

[Brief description of drawings]

FIG. 1 is a front sectional view of a main shaft portion showing a tool unclamping device of the present invention.

FIG. 2 is a vertical cross-sectional view of a main shaft portion showing a tool unclamping device of the present invention.

FIG. 3 is an enlarged cross-sectional view of essential parts showing a tool unclamping device of the present invention.

FIG. 4 is an enlarged cross-sectional view showing an operation of a main part of the tool unclamping device of the present invention.

FIG. 5 is a perspective view showing a second embodiment of the essential parts of the tool unclamping device of the present invention.

[Explanation of symbols]

 1 Spindle Head 3 Spindle 4 Tool 13 Pin 14 Cylinder 15 Bifurcated Lever 15 20 Ring Body 10 Tool Changer

Front page continuation (72) Inventor Kazuo Kubono 4888 Takatsuka-cho, Hamamatsu-shi, Shizuoka Enshu Co., Ltd. Enshu Co., Ltd. 4888 Takatsuka-cho, Hamamatsu-shi, Japan (72) Inventor Tatsuharu Sawaki 4888 Takatsuka-cho, Hamamatsu-shi, Shizuoka Enshu Co., Ltd.

Claims (2)

[Claims] 1. A spindle motor is connected to a spindle end, a pin is orthogonally penetrated through a hole formed in an intermediate portion of the spindle, and the pin fixed orthogonally to a clamp bar is orthogonally fixed to a spindle tip side by a bifurcated lever driven by a cylinder or the like. In the pressing method, the ring body is mounted and fixed to both ends of the pin while being loosely fitted to the intermediate portion of the main shaft, and the clamp body is pushed by pushing the ring body by the pushing portion attached to the bifurcated lever. Tool unclamp device characterized in that 2. A spindle motor is connected to a spindle end, a pin is orthogonally penetrated through a hole formed in an intermediate portion of the spindle, and the pin is fixed orthogonally to a clamp bar by a bifurcated lever driven by a cylinder or the like to the spindle tip side. In the pressing method, the ring body is pivotally mounted at a predetermined position of the bifurcated lever facing the pin so that the ring body presses both ends of the pin while being loosely engaged with the intermediate portion of the main shaft. A tool unclamp device characterized by pushing a clamp bar.