JPS6312887Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a shank fixing device for attaching a tool holder to a rotating sleeve of a tool presetter. There are many types of shank end shapes of tool holders used in machining centers, such as draw screw type and pull stud type.
There is also a need for tool presetters to accommodate such changes in shape. In response to these demands, a device has been devised in which only the chucking unit provided inside the rotating sleeve can be quickly replaced, as shown in, for example, Japanese Utility Model Application No. 57-122344. This devised device had been in use for a long time. Compared to a device that replaces the rotating sleeve itself, it is more practical in terms of ease of replacement operation, but the quick replacement structure is complicated, and the replacement operation requires first turning the handle to loosen the shank of the tool holder, and then Tighten the nut 3
2 is loosened with a spanner and then turned by hand to pull out the tracking unit downwards, which again has the drawback of being time consuming and troublesome.

This invention aims to overcome these conventional drawbacks and provide a device that is simple in structure and easy to operate. The details will be explained below with reference to the drawings showing the embodiments.

Fig. 1 is an external view of a tool presetter showing an example of this invention, where part A shows the part where the tool holder is attached, and as shown in Figs. A mounting hole 11 that is rotatably attached to the fixed part K and into which the shank part of the tool holder is inserted into the upper end, a cylindrical hole 12 formed at the bottom of this mounting hole 11, and one location on the inner circumference of the open end of this cylindrical hole 12. Rotating sleeve 10 having a keyway 13 in
is fixed to the lower end of this rotary sleeve 10 and rotatably supports this rotary sleeve 10 with respect to the fixed part of the tool presetter, and the inner diameter 21
has an annular groove 22 having an arcuate cross section, and further has an inner diameter 21.
a flange 20 having a key groove 23 similar to the key groove 13 at one location;
0 inner diameter 21 and the cylindrical hole 1 of the rotating sleeve 10
2, has a built-in tool holder shank end gripping mechanism 30, and has a bottomed hole 41 formed at the lower end;
An annular groove 2 formed in the inner diameter 21 of the flange 20
A large number of small holes 42 are bored in the cylindrical part at two positions at appropriate intervals in the radial direction, and an annular groove 43 with an arcuate or V-shaped cross section is formed in the hole 41 located closer to the lower end than the small hole 42 position, and the lower end side Keyway 44 at one location on the outer circumference
It has a fixing unit main body 40 having an outer diameter 51 having a size to be inserted into the hole 41 of the fixing unit main body 40, and the above-mentioned small hole 4 around the outer diameter 51.
The operating ring 50 has hemispherical or conical recesses 52 at the same intervals as the recesses 52, and an annular groove 53 with an arcuate cross section is formed on the outer circumference closer to the lower end than the recess 52 position, and a small hole in the fixing unit main body 40. 42 and movable between the recess 52 of the operating ring 50 and the annular groove 22 of the flange 20 in a direction perpendicular to the axis, that is, in a radial direction, by rotation of the operating ring 50; and the key 70 installed in the space formed by the keyways 44, 13, and 23 formed in the rotating sleeve 10 and the flange 20, and the annular groove 43 of the fixing unit main body 40.
and the annular groove 53 of the operating ring 50. In addition, a small hole is made in the operating ring 50 parallel to the axis, a steel ball and a spring are inserted, and the spring force presses the steel ball toward the bottom side of the hole 41 of the fixing unit main body 40. A recess into which a part of the steel ball fits is formed at two locations, namely, the position where the recess 52 of the operating ring 50 matches the small hole 42 of the fixing unit main body 40, and the intermediate position between the small holes 42. A so-called click stop mechanism 90 is provided for positioning the operating ring 50 using spring force. The shank end gripping mechanism 30 of the embodiment shown in FIG. 2 is for gripping the shank of a draw screw type tool holder, and has a shaft portion 32 having a screw 31 at the tip and having a handle 100 mounted on the opposite side.
, which passes through the interior of the fixing unit main body 40 and is attached to the fixing unit main body 40 so as to be rotatable only.

Next, the exchange operation of this embodiment will be explained.
When replacing the state shown in FIG. 2 with a fixed unit having a different shank end gripping mechanism, first operate the shank end gripping mechanism 30 to disengage it from the tool holder side, and then rotate the operating ring 50. Hollow 52
Align the steel ball with the 60th position. As a result, the steel ball 60 can move radially from the annular groove 22 of the flange 20, that is, toward the recess 52, so that the fixing unit main body 40 can be disengaged from the flange 20 and pulled out downward. For example, when mounting a tool holder having a pull stud, as shown in FIG. Insert into the cylindrical hole 12 of the rotary sleeve 10 in the direction of the arrow with the recess 50' aligned with the steel ball 60' in the fixed unit main body 40'. Then, the operating ring 50' is rotated. The steel ball 60' in the recess is therefore pushed into engagement with the annular groove 22 of the outer flange 20, and the fixing unit is mounted on the rotating sleeve. Thereafter, the tool holder is installed and fixed by rotating the handle 100' and operating the shank end gripping mechanism 30'.

With the above structure, the device of this invention has a simpler quick exchange structure than the conventional one, and the exchange operation can be done by simply rotating the operating ring, which further facilitates quick changes. Furthermore, it has the practical effect of being able to be replaced only manually, without requiring tools such as spanners as in the past.

[Brief explanation of the drawing]

Fig. 1 is an external view of a tool presetter including this invented device, Fig. 2 is a front sectional view showing details of section A in Fig. 1, Fig. 3 is a sectional view taken along line BB in Fig. 2, and Fig. 4. is a sectional view taken along line C-C in Figure 2, and Figure 5 is taken along line D- in Figure 2.
D sectional view and FIG. 6 each show an explanatory sectional view of the exchange operation. Explanation of symbols, 10... Rotating sleeve, 20...
Flange, 30, 30'...shank end gripping device,
40, 40'... Unit body, 50, 50'...
Operation ring, 60, 60', 80... Steel ball, 70
...Key, 90...Click stop mechanism, 10
0,100'...Handle.

Claims (1)

[Scope of utility model registration request] It is rotatably installed in an insertion hole provided in a fixed part of the machine, has a mounting hole in the upper end into which the shank of the tool holder is inserted, and a rotating sleeve with a cylindrical hole in the lower part, and is fixed to the lower end of this rotating sleeve. An annular flange that rotatably supports the rotating sleeve, a shank end gripping mechanism built into the cylindrical unit body that is attached to the rotating sleeve through the flange, and an operating ring that is rotatably attached to the bottom of the unit body. and a quick exchange structure using steel balls is provided between the operating ring and the unit body and the flange, and the unit body is fixed in the rotational direction with respect to the rotating sleeve and the flange. Tool holder shank fixing device.