JPS603538B2 - Cuttle fastening device - Google Patents

Description

[Detailed description of the invention] TECHNICAL FIELD This invention relates to a fastening device.

As a follower and cutter fastening device, one constructed as shown in FIG. 1, for example, is known.

That is, the adapter main body 4 is attached to the main shaft spindle 2 of the machine main body 1 by a pull bolt 3 and a clamp bolt (not shown), and the main shaft spindle 2 and the adapter main body 4 are configured to rotate integrally. , a key member 5 is provided between the main shaft spindle 2 and the adapter body 4. A cutter body 6 having a cutting blade tip 6a at the tip of the adapter body 4.
is detachably attached by a vertical bolt 7.
To explain this in more detail, the tip surface 4 of the adapter body 4
A protrusion 8 is provided at the center of the cutter body 6, and a through hole 9 is formed in the center of the cutter body 6 in all axial directions, with which the protrusion 8 competes and through which the tightening bolt 7 passes. The cutter body 6 is attached to the adapter body 4 by pressing the cutter body 6 toward the adapter body 4 and tightening the tightening bolt 7 so that the protrusion 8 competes with the through hole 9. Note that a key member 10 is attached to the tip surface 4a of the adapter body 4 with a screw 10a so that the cutter body 6 physically rotates with the adapter body 4 when the cutter body 6 is attached to the adapter body 4. There is. However, this type of cutter fastening device has the following drawbacks.

'1} When removing the cutter body 6 from the adapter body 4, it is necessary to completely remove the tightening bolt 7 from the adapter body 4, so it takes a long time to attach and detach the cutter body 6.

■ When attaching and detaching the cutter body 6 from the adapter body 4,
The tightening bolt 7 must be operated while supporting the cutter body 6 by hand or other means, making the attachment/detachment work cumbersome and incomplete.

This invention has been made to solve the above-mentioned drawbacks, and its purpose is to provide a cutter fastening device that can shorten the time required to attach and detach the cutter body and also make the attachment and detachment operations safe. Embodiments of the present invention will be described in detail below with reference to FIGS. 2 to 12. In the figures, the same parts as in FIG. The cutter fastening device of the invention includes a cutter body 20 that is attached to the tip of a conventional adapter body 4, and a fastener that is screwed into the adapter body 4 through through holes 21 formed in all directions in the center of the cutter body 20. an attached bolt 22, an intermediate member 23 interposed between the through hole 21 and the tightening bolt 22, a spring member 24 that biases the intermediate member 23 in a direction opposite to the adapter main body 4, and the intermediate member 23 at a predetermined position in the radial direction of the adapter body 4.

These will be explained in order below.

The cutter body 201 is the tip surface 4 of the adapter body 4.
A boss surface 20a is provided which is in contact with a.

This boss surface 20a is provided with a key groove 26 into which the key member 10 provided on the distal end surface 4a of the adapter body 4 is engaged. This keyway 26 is formed in an arcuate groove (length of 1/4 of the circumference) that is the same as the center of the cutter body 20. Furthermore, a through hole 2 formed in the center of the cutter body 20
1 is a large diameter hole 2 into which the protrusion 8 of the adapter body 4 is inserted;
7 and a small diameter hole 28 opened in the opposite direction. Furthermore, notches 29, 29 extending toward the sea bream are formed in the inner circumferential wall of the small diameter hole 28 to face each other (see FIGS. 6 and 7). The vertical bolt 2
2 is screwed into the protrusion 8 of the adapter body 4 through the through hole 21 in the ratchet direction, and its configuration is as follows:
It consists of a neck portion 30, a formation portion 31, and a threaded portion 32.

That is, the head 30' is formed to be slightly smaller than the inner diameter of the small diameter hole 28 of the through hole 21. Also,
The iron fitting portion 31 is formed into a round bar shape so as to fit into an intermediate member 23, which will be described later. Further, the threaded portion 32 is screwed into the protruding portion 8 of the adapter body 4. A capital 33 is provided between the consignment joint part 31 and the threaded part 32.
is formed (see Figure 10). The intermediate member 23
is formed into a substantially cylindrical shape, and its outer diameter is adapted to be inserted into the small diameter hole 28 of the through hole 21,
Further, the inner diameter is such that the iron fitting portion 31 of the tightening bolt 22 is aligned, and the inner diameter is smaller than the head portion 30. In particular, a notch 2 is formed in the through hole 21 on the outer peripheral surface of one end of the cylindrical shape (the end on the head side of the tightening bolt 22).
Convex portions 34, 34 are formed to match 9, 29.
The outer ends of the protrusions 34, 34 are smaller than the large opening 27 of the through hole 21, and smaller than the inner walls of the notches 29, 29. Further, the convex portions 34, 34
One end surface (the end surface on the adapter body 4 side) of the cutter body 2
When the boss surface 20a of the cutter body 20 is in contact with the tip end surface 4a of the adapter body 4, the opening green of the small diameter hole portion 28 of the through hole 21 is locked to prevent the cutter body 20 from slipping out. (See Figures 8 and 9). The spring member 24
1 is an annular body which is clamped on the neck portion 33 of the tightening bolt 22, and this annular body is curved in the axial direction as shown in FIG. One end of this spring member 24 comes into contact with the threaded portion 32 side of the vertical bolt 22 and is locked, and the other end comes into contact with a partial end of the intermediate member 23 (the end on the adapter main body 4 side). The intermediate member 23 is always urged toward the head 30 of the tightening bolt 22. The positioning pin 25 is interposed between the intermediate member 23 and the protruding portion 8 of the adapter body 4, and is configured to position the intermediate member 23 on a positioning layer of the adapter body 4 in the radial direction.

In other words, the positioning pin 25
3 rotates integrally with the adapter body 4. A recess 35 is formed in the center of the tip of the cutter body 20 so that the head 30 of the bolt 22 does not protrude further forward (in the axial direction) than the cutting edge tip 6a.

Next, the operation of attaching and detaching the cutter main body 20 in the cutter fastening device configured as described above will be explained.

First, when attaching the cutter body 20 to the adapter body 4, loosen the cotton bolt 22 and insert the notches 29 formed in the through hole 21 of the cutter body 20 into the protrusion 34 of the intermediate member 23. , 34, and press the cutter body 20 toward the adapter body 4 side. Then, the cutter body 20 is guided by the intermediate member 23 and the through hole is formed in the protrusion 8 of the adapter body 4 because the intermediate village 23 is positioned on the positioning layer in the radial direction of the adapter body 4 by the positioning pin 25. As a result, the position of the cutter main body 20 in the radial direction is restricted, and the key member 10 is fitted into the key groove 26 provided on the boss surface 20a. When the boss surface 20a of the cutter body 20 touches the tip surface 4a of the adapter body 4, the green lip of the small diameter hole 28 of the through hole 21 is located closer to the adapter body 4 than the protrusions 34, 34 of the intermediate member 23. Therefore, the cutter main body 20 is in a state where it can be rotated.At this time, the intermediate part village 23 is moved by the spring part village 24 to tighten the tightening bolt 2.
The cutter body 20 is biased toward the head 30 side of the cutter body 20.
They do not move together (see Figures 4 and 5). After this, rotate the cutter body 20 at 90o clockwise (cutting rotation direction).
When the cutter body 20 is rotated, the key member 10 comes into contact with the end of the key groove 26, and the rotation of the cutter body 20 is stopped.

As a result, the notches 29, 29 are moved from the corresponding positions of the convex parts 34, 34, and the mouth edge of the small diameter hole 28 is moved from the corresponding position of the convex parts 34, 34.
It will be in a state where it is locked. After that, when the vertical bolt 22 is screwed into the adapter main body 4 side, the front magazine convex parts 34, 34 come into contact with the rim of the small diameter hole part 28, and the position of the cutter main body 20 is regulated in all directions. , As a result, the cutter body 20 is attached to the adapter body 4.

Further, when removing the cutter body 20 from the adapter body 4, first loosen the cotton bolt 22 a little and then perform the operation opposite to the above.

Note that the cutter main body 20 fastened as described above does not idle during cutting because the key member 10 is in contact with the end of the keyway 26.

As explained in detail above, the present invention has a configuration in which a cutter body is attached to an adapter body of a main spindle with a striped bolt, and the cutter body has a cutting tip at its tip. In the cutter fastening device, the head of the vertical bolt is formed to be smaller than the through hole, and the inner circumferential wall of the through hole has:
A notch running toward the bag is formed, and a cylindrical intermediate member that locks the cutter body is interposed between the tightening bolt and the through hole. A surface portion is provided with a convex portion that fits the notch, and after the cutter body is pushed into the adapter body in such a manner that the cutout portion of the cutter body corresponds to the convex portion of the intermediate member, the cutter body is rotated at a predetermined angle. Since the cutter body is fastened to the adapter body by moving the cutter body and tightening the tightening bolt, the cutter body can be attached and detached by simply loosening the bolt slightly and rotating the cutter body at a predetermined angle. This reduces the amount of time it takes to attach and detach the cutter body, and since it is only necessary to slightly loosen the tightening bolt, the cutter body will not fall off immediately, making it possible to safely attach and detach the cutter body. .

Further, according to the present invention, since the spring member is disposed between the adapter body and the intermediate member, the intermediate portion always touches the head of the tightening bolt, and therefore the cutter body can be installed smoothly. It can be carried out. Furthermore, according to this invention,
Since the positioning pin is provided between the adapter body and the intermediate member, the intermediate member does not rotate unnecessarily and is always in the correct position in the radial direction of the adapter body. It can be attached to.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional front view of a conventional cutter fastening device, Figs. 2 to 12 show an embodiment of the cutter fastening device of the present invention, and Fig. 2 shows a state in which the cutter main body is attached to the adapter main body. 3 is a sectional view taken along the line mm, FIG. 4 is a bottom view showing the state in which the cutter body is attached to the adapter body, and FIG. 5 is a sectional view taken along the line V-V, Fig. 6 is a bottom view of the cutter body, Fig. 7 is a sectional view taken along the line along the side of the cutter, Fig. 8 is a bottom view of the intermediate member, Fig. 9 is a sectional view taken along the line KK, and Fig. 10 is a bottom view of the cutter body. The figure is a front view of the tightening bolt.
FIG. 11 is a front view of the spring member, and FIG. 12 is a cross-sectional view of the spring member taken along the line I-1. 2...Main shaft spindle, 4...Adapter body, 6a
... Cutting blade tip, 8... Protrusion part, 10... Key member,
20... Cutting body, 21... Through hole, 22... Tightening bolt, 23... Intermediate member, 24... Spring member, 2
5...Positioning pin, 26...Key groove, 29...Notch, 30...Head 32...Threaded part, 34...
Convex part. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 8 Figure 9 Figure 6 Figure 7 Figure 10 Figure 11 Figure 12

Claims (1)

[Claims] 1 A cutter fastening device configured to attach a cutter body to an adapter body of a main shaft spindle with a tightening bolt, wherein the cutter body has a cutting tip at its tip and the tightening tip in the axial direction of its center. In the cutter fastening device, each of which is provided with a through hole through which a bolt passes, the head of the tightening bolt is formed to be smaller than the through hole, and a notch extending in the axial direction is formed in the inner circumferential wall of the through hole. Furthermore, a cylindrical intermediate member that locks the cutter body is interposed between the tightening bolt and the through hole, and the intermediate member has a cylindrical member on its outer peripheral surface that fits into the notch. A convex portion is provided, and a spring member is provided between the adapter main body and the intermediate member for urging the intermediate member toward the head side of the tightening bolt, and further, a spring member is provided between the adapter main body and the intermediate member, and a spring member is provided between the adapter main body and the intermediate member. A positioning pin for positioning the intermediate member at a fixed position in the radial direction of the adapter body is provided between the adapter body and the intermediate member, and a positioning pin is provided between the adapter body and the cutter body. is provided with a key member, and the other is provided with an arcuate keyway that fits the key member and is concentric with the through hole, and the notch of the cutter body corresponds to the convex part of the intermediate member. The cutter body is fastened to the adapter body by rotating the cutter body by a predetermined angle and tightening the tightening bolt after the cutter body is pushed into the adapter body side. Device.