JPS6154521B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tool holder, and more particularly to an improvement in a tool holder that holds a conventional tool having a long shank portion and is suitable for attachment to a tool rest of a machine tool.

BACKGROUND TECHNOLOGY Conventionally, a conventional cutting tool having a long shank portion is directly attached to a tool rest of a machine tool.

Problems to be solved by the invention Conventionally, in order to accurately direction and position the cutting tool, a shim was inserted between the tool post and the cutting tool, and positioning was performed by adjusting the thickness of the shim. . However, this work is extremely labor-intensive and time-consuming, and must be repeated every time the cutting tool is removed and installed, making it extremely time-consuming.

The present invention aims to solve this problem.

Means for Solving the Problems The tool holder according to the present invention is provided with a cutting tool accommodating groove having a substantially rectangular cross section extending in the length direction on one side of a long holder main body having a substantially rectangular cross section over the entire length of the holder main body. , a notched groove is provided continuously on the lower surface of the top wall of the tool housing groove and extends inwardly toward the other side surface of the holder body and in the length direction of the holder body, and the top wall extends in the lateral direction of the holder body. divided by a groove to form a front top wall and a rear top wall, the rear end of the notched groove is positioned forward of the rear end of the holder body, and a screw is provided for tightening the front top wall downward; The rear top wall is configured to be tightened with a screw that fixes the cutting tool holder to a tool rest or the like.

Function: The cutting tool is positioned and held in the holder body by the screw that tightens the front top wall, and is fixed, so it is easy to replace or change the position of the tooling tool while the holder body is fixed to the tool rest. There is no need for readjustment.

Since the rear end of the notched groove is positioned forward of the rear end of the holder body, the holder body can be attached to the tool rest using the screw (usually attached to the tool rest) that attaches the tool holder to the tool rest. When fixing, the screw near the rear end of the holder body is involved only in tightening the holder body, while the front screw is involved in both tightening the holder body and fixing the cutting tool to the holder body, so it is difficult to use during cutting. Both sufficient support for force and ease of changing the tool bit can be achieved.

Embodiments Examples of the invention will now be described with reference to the accompanying drawings.

1 to 4, the holder main body 2 that accommodates and holds the cutting tool 1 has a substantially rectangular cross section as shown in FIGS. A cutting tool accommodating groove 4 having a rectangular cross section is provided over the entire length of the holder body 2. A cutout groove 7 is provided on the lower surface of the top wall 5 of the cutting tool housing groove and extends inwardly toward the other side surface 6 of the holder body and in the length direction of the holder body 2. The top wall 5 is divided by a groove 10 extending in the lateral direction of the holder body 2 to form a front top wall 8 and a rear top wall 9. The front top wall 8 is connected to the bottom wall 1 of the cutting tool storage groove 4.
A screw 12 is provided which is tightened toward the cutting tool 1, and the cutting tool 1 accommodated in the cutting tool accommodating groove 4 is thereby positioned and held. When this cutting tool holder is attached to a tool rest (not shown) of a machine tool, the rear top wall 9 is tightened toward the bottom wall 11 by a tightening screw provided on the tool rest.

As is clear from FIG. 2, the cutout groove 7 does not extend to the rear end of the holder body, and the rear end 13 is separated from the rear end surface 14 of the holder body. This configuration is especially effective when the rear top wall 9 is tightened toward the bottom wall 11 by the tightening screw of the tool rest.
This has the effect of preventing excessive tightening by the tightening screw when the rear end portion is located forward of the rear end surface of the holder main body 2. Furthermore, since the tightening screw only serves to fix the holder body to the tool rest at the rear end where there is no notched groove, it is easy to replace the cutting tool with the holder main body fixed to the tool rest. There is no need for readjustment after replacement.

FIG. 5 shows another embodiment and corresponds to FIG. In this embodiment, the lower surface of the top wall 5' is directed toward one side surface 3' of the holder body 2' with respect to the bottom surface 15' of the holder body 2', that is, toward the side opening end of the cutting tool receiving groove 4'. slopes downward in the direction. By sloping the lower surface of the top wall in this manner, the cutting tool is strongly pressed into the cutting tool accommodating groove during tightening, making the fixation even more reliable. Note that the slope may be provided only on either the front top wall or the rear top wall, or may be provided on both.

Effects of the Invention According to the present invention, the front top wall serves to fix the cutting tool to the holder main body, and the front top wall serves to fix the cutting tool to the holder main body and the holder main body to the tool rest, and also serves to fix the holder main body to the tool rest. Because the rear top wall, which serves only the function of
Positioning and adjustment work when changing the cutting tool can be greatly simplified.

[Brief explanation of the drawing]

FIG. 1 is a side view of a cutting tool holder according to the present invention.
Figure 2 is a top view. FIG. 3 is a sectional view taken along the - line in FIG. 1. FIG. 4 is a sectional view taken along the - line in FIG. 1. FIG. 5 is a sectional view similar to FIG. 4 showing another embodiment of the present invention. 1: Bit, 2: Holder body, 4: Bit accommodating groove, 5: Top wall, 8: Front top wall, 9: Back top wall,
7: Notch groove, 10: Lateral groove, 12: Screw, 1
3: Rear end of the notched groove, 14: Rear end surface of the holder main body, 15: Bottom surface of the holder main body.

Claims (1)

[Scope of Claims] 1. A tool accommodating groove 4 with a substantially rectangular cross section extending in the length direction is provided on one side of a long holder main body 2 having a substantially rectangular cross section over the entire length of the holder main body. A cutout groove 7 is provided continuously on the wall and extends inwardly toward the other side of the holder body and in the length direction of the holder body, and the top wall is divided by the groove extending in the lateral direction of the holder body. to form a front top wall 8 and a rear top wall 9, the rear end portion 13 of the notched groove is positioned forward of the rear end surface of the holder main body, a screw is provided for tightening the front top wall downward, and the rear top wall A tool holder characterized in that the tool holder is tightened by a screw that fixes the tool holder to a tool rest. 2. The tool holder according to claim 1, wherein the lower surface of the top wall is parallel to the bottom surface of the holder body. 3. Claim 1, characterized in that a lower surface of at least one of the front top wall and the rear top wall is inclined downward in a direction toward the one side surface with respect to the bottom surface of the holder main body. bite holder.