JPH05200652A - Planetary roller accelerating mechanism built-in tool adapter - Google Patents

Abstract

PURPOSE:To prevent any machining failure from occurring de to rotational failure in a tool and any in a planetary roller speed-up mechanism from occurring due to overload breakdown by installing a rotational trouble discriminator which emits a trouble signal in the case where the promotion of speed increase to the rotational frequency of a tool setting part and that of a rotating part is less than the specified value. CONSTITUTION:Rotational frequency at unit time in a rotating part is detected by a first rotational frequency detecting means 51A and that at unit time in a tool setting part by a second rotational frequency detecting means 51B, respectively. These detection signals are inputted into a rotational trouble discriminator 50. In cutting and grinding operations, when overload due to cutting, grinding force or the like atributable to an excess of infeed value due to operation of an operator or an abnormal form in a workpiece, by way of example, is added to a planetary roller speed-up mechanism via a tool and a slip is produced in this planetary roller speed-up mechanism a trouble signal is outputted out of this discriminator 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool adapter with a planetary roller speed increasing mechanism.

[0002]

2. Description of the Related Art A tool adapter with a planetary roller speed-up mechanism according to the prior art is capable of engaging and disengaging with a rotating portion inserted into a spindle of a machine tool such as a machining center and a fixed side such as a spindle head. A fixed part to be coupled and a tool mounting part for mounting a tool are assembled and configured via a planetary roller speed increasing mechanism.

The rotating portion is formed by integrally forming a hollow shaft portion at the front end, a flange portion with a groove in the middle, and a taper shank at the rear end in a coaxial relationship. In the middle portion of the hollow shaft portion, three insertion holes for inserting a planetary roller having a rectangular cross section are radially formed so as to penetrate from the outer peripheral surface to the center hole at a center angle of 120 degrees, and the planetary roller is inserted. The hole is rotatably attached to the hollow shaft portion by a drive pin.

The rotating portion is rotatably supported on the fixed portion by a rolling bearing. In the hollow housing of the fixed portion, a ring-shaped fixed raceway surface is formed on the inner peripheral surface thereof, and the ring-shaped fixed raceway surface is formed. The outer peripheral surface of the planetary roller is engaged with.

The tool mounting portion is a rotary shaft that is rotatably inserted in the center hole of the hollow shaft portion through a rolling bearing, and the rear end portion protruding rearward from the bearing area of the rolling bearing is the sun roller portion. It is circumscribed with the planetary roller, and the tip portion projects from the tip of the rotating portion so that a tool can be attached. After all, the planetary roller speed-up mechanism is constituted by the ring-shaped fixed raceway surface, the planetary roller, and the sun roller section, and the rotation of the rotating section is accelerated to turn the tool mounting section.

[0006]

In the conventional tool adapter with a built-in planetary roller speed-increasing mechanism as described above, when performing cutting / grinding, the cutting amount is caused by an erroneous operation of the operator or an abnormal shape of the workpiece. As a result, the small planetary roller speed-up mechanism is overloaded, causing damage.

In order to solve the above problems, the present invention detects an overload on the planetary roller speed increasing mechanism in the tool adapter with a planetary roller speed increasing mechanism to prevent damage.

[0008]

A planetary roller speed-up mechanism built-in tool adapter according to the present invention has a center part in the axial direction formed in the front half and a rotary part mounted in the main shaft of a machine tool in the latter half, and a rotary part. A fixed part, which is a hollow housing that is rotatably fitted and supported on the outer periphery of the front half of the machine part, is engaged with and disengaged from the fixed side of the machine tool, and is inserted into the center hole of the rotary part. It is freely rotatable with respect to the
Further, a tool attachment portion for attaching a tool to the tip end portion is assembled and configured via a planetary roller speed-up mechanism, and is provided in the fixed portion, and first rotation speed detection means for detecting the rotation speed of the rotation portion per unit time, Similarly, the detection signals of the second rotation speed detection means and the first rotation speed detection means and the detection signals of the second rotation speed detection means, which are provided on the fixed portion and detect the rotation speed of the tool attachment portion per unit time, are input. And a rotation abnormality determining device that outputs an abnormality signal when the speed increasing ratio of the rotation speed of the tool mounting portion to the rotation speed of the rotating portion is less than a predetermined value. A rotor may be provided on the outer peripheral portion of the front half of the rotating portion, and a stator may be provided to face the hollow hole of the fixed portion so as to constitute an internal generator as a power source of the rotation abnormality determination device.

[0009]

When the main shaft of the machine tool equipped with the tool adapter with the planetary roller speed increasing mechanism is rotationally driven, the rotating part rotates with respect to the hollow housing connected to the fixed side of the machine tool. Then, the planetary roller rotatably / rotatably supported on the first half of the rotating portion rotates while contacting with the ring-shaped fixed raceway surface of the hollow housing and the outer periphery of the sun portion of the tool mounting portion, and revolves around the spindle axis. Then, the sun part, that is, the tool attached to the tool mounting portion rotates at a speed higher than the rotation of the rotating portion, that is, the main shaft. The output of the built-in generator that is generated by the rotation of the rotor of the rotating part relative to the stator of the fixed part of the tool adapter with built-in planetary roller speed-up mechanism during cutting / grinding or the output of other power supply means is the path of the rotation abnormality determination device. Is entered.

On the other hand, the rotation speed of the rotary unit per unit time is detected by the first rotation speed detecting means, and the rotation speed of the tool mounting portion per unit time is detected by the second rotation speed detecting means. These detection signals are input to the rotation abnormality determination device, and in the rotation speed detection / comparison circuit, the ratio between the rotation speed of the rotating portion and the rotation speed of the tool mounting portion, that is, the detected speed increasing ratio, is obtained, and further, it is set to a predetermined value. The ratio with is required.

When the planetary roller speed increasing mechanism is operating normally, the detected speed increasing ratio reaches a predetermined value, and no abnormal signal is output from the rotation abnormality determining device. If an overload due to cutting / grinding resistance, etc. due to an excessive depth of cut caused by an operator's erroneous operation or an abnormal shape of the workpiece is applied to the planetary roller speed increasing mechanism via a tool, slippage will occur in the planetary roller speed increasing mechanism. Occurs. As a result, when the detected speed increase ratio decreases and becomes less than the predetermined value, an abnormal signal is output from the rotation speed detection comparison calculation circuit, and the operator can know the abnormal state of the overload occurrence.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A tool adapter with a planetary roller speed increasing mechanism according to an embodiment of the present invention will be described with reference to the drawings. In FIG.
A tool adapter with a built-in planetary roller speed-up mechanism is a tool for mounting a rotating part that is inserted into a spindle of a machine tool such as a machining center and a fixed part that is detachably engaged with a fixed side such as a spindle head. It is composed of a mounting part.

The rotary portion is formed by integrally forming a hollow shaft portion 1 at the tip, a flanged portion 2 having a groove in the middle, and a taper shank 3 at the rear end in a coaxial relationship. In the middle part of the hollow shaft part 1,
Insertion holes 5 for radially inserting a planetary roller, which have a rectangular cross section, penetrate through the outer peripheral surface into the center hole 4, and are formed at 3 or 4 locations with a center angle of 120 degrees or 90 degrees, and as shown in FIG. At both ends of the insertion hole 5 in the axial direction of the hollow shaft portion 1, mounting grooves 6a, 6b having a quadrangular cross section for planetary roller drive pins are formed.

Inner rings of two sets of deep groove ball bearings 9 and 9 with seals are sandwiched between sleeves 8 and 8 and are fitted to drive pins 7 having shafts 7a and 7b having a substantially quadrilateral cross section, and outer rings thereof. A planetary roller 10 is fitted in. When attaching the drive pin 7 to which the planetary roller 10 is attached to the hollow shaft portion 1,
The planetary roller 10 and the sleeves 8, 8 are inserted into the insertion hole 5 from the outer diameter side of the hollow shaft portion 1 in the radial direction, and the shaft necks 7a, 7b are inserted in the mounting grooves 6a, 6b, respectively. (See Figure 2)

Thus, the planetary rollers 10, 10, ... Are axially positioned by the sleeves 8, 8 and the deep groove ball bearings 9, 9 in the respective insertion holes 5 and are rotatably mounted on the hollow shaft portion 1, and the planetary rollers 10, 10. The outer peripheral surface of the roller 10 is partially hollow shaft 1
An appropriate amount of protrusion from the outer peripheral surface. Therefore, the hollow shaft portion 1
An appropriate gap can be provided between the outer peripheral surface of the and the ring-shaped fixed raceway surface 22 (described later).

As will be described later, the hollow shaft portion 1 of the rotating portion is rotatably supported by the fixed portion via the planetary roller 10 and the deep groove ball bearing 11 with a seal. The inner ring of the deep groove ball bearing with seal 11 is fitted to the front end of the mounting groove 6a.

Further, a collar portion 12 is attached to the outer peripheral surface of the hollow shaft portion 1 on the rear end side, and a labyrinth seal portion and a seal 14 having a lip are fitted to the collar portion 12, so that the hollow shaft portion 1 A labyrinth seal portion formed in a brim and a seal 17 having a lip are fitted to the cap-shaped member 15 fitted to the tip of the. The sealed deep groove ball bearing 11 is added to the labyrinth seal portion and the seal 17 with respect to the sealing function for the center hole 4 and the insertion hole 5.

Further, the collar portion 12 is provided radially outward of the collar portion 12.
A first rotation speed sensor 51A on the input shaft side is provided with a minute gap with respect to the outer peripheral surface thereof at a position coinciding with the flange portion 12 in the axial direction. When the first rotation speed sensor 51A is a magnetic sensor, the collar portion 12 is made of a magnetic material, and a plurality of concave portions are formed on the outer peripheral surface of the collar portion 12 at equal intervals around the circumference.
When is rotated, the first rotation speed sensor 51 facing the recess is formed.
Since the recesses periodically pass with respect to A, the electric pulse signals are output from the first rotation speed sensor 51A in a number equal to the number of passages of the recesses.

When the first rotation speed sensor 51A is an optical sensor, the outer peripheral surface of the collar portion 12 has a plurality of surface states having a light reflectance different from that of the collar body, and the portions are equidistant from the circumference. When the collar portion 12 is processed into a circular shape and rotates, since the portion periodically passes through the first rotation speed sensor 51A facing the portion that causes optical reflection, the number of passages is equal to the number that the portion passes. An electric pulse signal is output from the first rotation speed sensor 51A. Instead of processing the portion that causes optical reflection, tapes that cause optical reflection may be attached at equal intervals around the circumference.

An annular groove 18 is formed in the grooved collar portion 2 so that a changing hand of the automatic tool changing device can be engaged therewith. The pull rod of the main shaft of the machining center is screwed into the screw hole formed in the rear end surface of the taper shank, and the taper shank is inserted into the taper hole of the main shaft.

A jacket groove 21 is formed on the outer peripheral surface of the fixed portion, a ring-shaped fixed raceway surface 22 for the planetary roller is formed on the inner peripheral surface, and a projecting edge portion which is in close contact with the lip of the seal 17 is formed on the inner peripheral surface of the front end portion. At the same time, the rear end face comes into contact with the lip of the seal 14, and a through hole 25 penetrating from the jacket groove 21 toward the cutting (grinding) coolant discharge port 24 on the front end face is also provided. A cylindrical hollow housing 20 is provided, and a jacket cover 26 covering the jacket groove 21 is sealed on the outer peripheral surface of the housing 20 with an O-ring and is fitted with an adhesive.

A permanent magnet piece 52 is formed on the outer peripheral surface portion of the hollow shaft portion 1 in the front area of the insertion hole 5 where the mounting groove 6a is not formed.
a is fixed, and the ring-shaped fixed raceway surface 22 is provided with a power generation coil 52b wound around a core at a position that coincides with the position of the permanent magnet piece 52a in the axial direction. The passing circumference of the tip of the permanent magnet piece 52 faces the tip of the core with a minute gap, and the both constitute a generator 52 for the rotation abnormality determination device 50 (later described) power supply.

Further, a detent device 40 is provided on the outer peripheral surface of the hollow housing 20. The rotation stopping device 40 is slidably fitted in the guide sleeve 41 and a guide sleeve 41 fixed to the outer peripheral surface of the hollow housing 20 in the spindle axis direction, and is biased rearward in the spindle axis direction by a compression spring 42. The detent pin 43, and the flange 12 attached to the hollow shaft 1 are engaged with and disengageable from the engaging claw arm 44, which projects in the radial direction and is slidable on the guide sleeve 41 and the detent pin 43. And an adjusting sleeve 46 which is externally fitted to the adjusting sleeve 46 and is biased rearward in the axial direction of the main shaft by a compression spring 45. Then, the tip of the detent pin 43 is adapted to be engaged with the fixed portion of the machining center, for example, the engaging recess of the detent member on the tip surface of the spindle head when the spindle of the taper shank 3 is inserted. ..

In the hollow housing 20 mounted on the outer periphery of the hollow shaft portion 1, the inner peripheral surface thereof has a ring-shaped fixed raceway surface.
The outer ring of the deep groove ball bearing with seal 11 is positioned and fixed at the step on the front side of 22, and the outer peripheral surface of the planetary roller 10 is engaged with the ring-shaped fixed raceway surface 22, and the lip of the seal 14 comes into close contact with the rear end surface. The lip of the seal 17 is in close contact with the projecting edge portion, and the inner peripheral surface of the distal end portion of the hollow housing 20 faces the labyrinth seal portion.

The tool mounting portion comprises three rolling bearings (for example, angular ball bearings having ceramic balls) 31, 31,
The rotary shaft 30 is rotatably inserted into the central hole 4 of the hollow shaft portion 1 via 31. That is, with the step portion formed in the central hole 4 of the hollow shaft portion 1 as the axial bearing surface, the outer rings of the rolling bearings 31, 31, 31 are fitted in the central hole 4 in order in close contact with each other in the axial direction. The positioning is performed, and the outer peripheral surface of the rotating shaft 30 is fitted to these inner rings. That is, rotating shaft 30 (tool mounting part)
The rigidity of the hollow shaft portion 1 (rotating portion) is maintained by the rolling bearings 31, 31, 31.

A sun roller portion 32 is formed on the rotary shaft 30 projecting to the inner side of the inner ring of the rolling bearings 31, 31, 31, and the sun roller portion 32 projects from the inner opening of the insertion hole 5. It is circumscribed with the planetary roller 10. After all, the ring-shaped fixed raceway surface 22, the planetary rollers 10, ... And the sun roller portion 32 constitute a planetary roller speed-up mechanism.

The tip portion of the rotary shaft 30 projects from the tip hole of the cap-shaped member 15 of the rotary portion through the seal 33 and the labyrinth seal portion so that a tool can be properly mounted. An appropriate marker is provided on the outer peripheral surface of the tip of the rotary shaft 30 as in the case of the collar portion 12, and the second rotational speed on the output shaft side that can face the marker with a minute gap like the first rotational speed sensor 51A. The sensor 51B is provided at a position that coincides with the marking position in the axial direction.

A rotation abnormality determining device 50 having a circuit as shown in FIG. 3 is mounted on the outer peripheral surface of the jacket cover 26. The rotation abnormality determining device 50 has a power supply circuit 53 connected to a generator 52 and an input. Circuit 54A, 54B, rotation speed detection comparison operation circuit
55, a light emitting diode drive circuit 56, a light emitting diode 57, and a signal output circuit 58 (one of the light emitting diode drive circuit 56 and the light emitting diode 57 or the signal output circuit 58 may be omitted), and the power supply circuit 53 includes a generator 52. Input from the input circuit 54A, 54B, the rotation speed detection comparison operation circuit 55,
The light emitting diode drive circuit 56 and the signal output circuit 58 are connected so as to be supplied.

The power supply for the rotation abnormality determination device 50 may be an appropriate external power supply or a built-in battery. However, in the case of an external power source, it is structurally complicated to feed power to a detachable tool adapter, and in the case of a built-in battery, it becomes necessary to replace it by exhaustion. Therefore, the generator 52 in the above embodiment
A built-in power supply like the one is convenient.

The first rotation speed sensor 51A and the second rotation speed sensor 51B are connected so as to input the detection signals to the input circuits 54A and 54B, and the input circuits 54A and 54B output the sine wave detection signals to the rectangular wave. For example, a filter that shapes the waveform of the detection signal, is connected so that the detection signal of the rectangular wave whose waveform has been shaped is input to the rotation speed detection comparison calculation circuit 55, and the rotation speed detection comparison calculation circuit 55 is the input shaft side detection signal. And the output shaft side detection signal, the ratio between the input shaft side rotation speed and the output shaft rotation speed, that is, the speed increasing ratio is calculated and compared with the designed speed increasing ratio of the planetary roller speed increasing mechanism, and the ratio is allowed. If it is less than the value, the light emitting diode drive circuit 56 and the signal output circuit 58 are connected to input an alarm signal.

The rotation speed detection / comparison circuit 55 illustrated in FIG.
In the case of the F-V conversion circuits 55A and 55B, the input circuit 54
The detection signal in the form of the pulse frequency input from A and 54B is converted into a voltage signal, and the FV conversion circuit 55A transforms the output appropriately so as to set the abnormal level via the abnormal level setting potentiometer 55C. The F-V conversion circuit 55B is connected so that its output is directly input to the comparison element 55D so that it is input to the comparison element 55D. The differential voltage signal is connected to the light emitting diode drive circuit 56 and the signal output circuit 58 so as to input an alarm signal.

The operation of the tool adapter with the planetary roller speed increasing mechanism will be described. By inserting a shank of a predetermined tool into the taper hole at the tip of the rotary shaft 30, the tool is gripped by the tool adapter with a built-in planetary roller speed-up mechanism. At that time, the engaging claw arm 44 is engaged with the positioning hole formed in the front end surface of the collar portion 12 by the spring force of the compression spring 45, and the rotating portion and the fixed portion are in a fixed relationship.

The tool adapter with the planetary roller speed-up mechanism mounted with the tool is stored in, for example, a tool magazine of a machining center, and an annular groove of the grooved collar portion 2 is gripped by a replacement hand, so that the spindle of the machining center is predetermined. It is installed in an angular positional relationship. That is, the taper shank 3 is inserted into the taper hole of the main shaft, the pull rod of the main shaft is screwed into the screw hole of the taper shank 3, and the taper shank 3 is pulled in, whereby the tool adapter with the planetary roller speed increasing mechanism is fixed to the main shaft. It

At this time, the tip of the detent pin 43 engages with the engaging recess of the detent member on the tip surface of the spindle head, and the detent pin 43 is engaged.
Is retracted against the spring force of the compression spring 42, and the adjustment sleeve 46 abuts against the tip end surface of the rotation stopping member,
Retracting against the spring force of 45, the engaging claw arm 44 separates from the positioning hole of the flange 12. As a result, the fixed portion, that is, the hollow housing 20 is fixed, and the rotating portion is rotatable with respect to the fixed portion together with the main shaft.

Thus, when the spindle equipped with the tool adapter with the planetary roller speed-up mechanism is rotationally driven, the hollow shaft portion 1 supported by the deep groove ball bearings 9 and 9 with rotation rotates with respect to the hollow housing 20. .. Therefore, the ring-shaped fixed raceway surface 22
The planetary rollers 10 contacting with each other rotate about the drive pin 7 and revolve around the main axis. Then, the sun roller portion 32 contacting the planetary roller 10, that is, the rolling bearings 31, 3
The tool mounted on the rotary shaft 30 supported by the rotary shafts 1, 31 is accelerated by the rotation of the rotary part, that is, the main shaft to rotate. The thrust load on the tool is the rotary shaft 30, the rolling bearings 31, 31,
It is supported by the spindle through 31 and the rotating part.

Cutting (grinding) is performed by a tool that rotates at a high speed. At this time, the cutting (grinding) coolant is sent from the jacket groove 21 through the through hole 25 toward the jet outlet 24, and the cutting is performed from there. It is sprayed on the spot. Then, the infiltration of cutting (grinding) coolant during machining into the inside of the tool adapter with built-in planetary roller speed-increasing mechanism causes a seal during low-speed rotation.
Blocked by 14, 17, 33, while rotating at high speed, the lip of each seal 14, 17, 33 is deflected by centrifugal force to separate from the close contact point to prevent frictional heat, but it is blocked by each adjacent labyrinth seal part. To be done.

A generator for generating electric power by rotating the permanent magnet 52a of the rotating portion with respect to the power generating coil 52b of the fixed portion of the tool adapter with the planetary roller speed increasing mechanism during cutting / grinding processing.
The output of 52 is input to the power supply circuit 53 of the rotation abnormality determination device 50, and the power supply circuit 53 appropriately receives the input from the generator 52 as input circuits 54A and 54B, a rotation speed detection comparison calculation circuit 55, and a light emitting diode drive circuit 56. And the signal output circuit 58, and the rotation abnormality determination device 50 operates.

On the other hand, the rotation speed N of the rotating portion, that is, the hollow shaft portion 1.
1 is detected by the first rotation speed sensor 51A, and the rotation speed N2 of the tool mounting portion, that is, the rotary shaft 30 is detected by the second rotation speed sensor 51B. Those detection signals are input as sine waves to the input circuits 54A and 54B of the rotation abnormality determination device 50, waveform-shaped into a rectangular wave, and further input to the rotation speed detection / comparison circuit 55.

In the rotational speed detection / comparison circuit 55, the ratio between the rotational speed N1 of the hollow shaft portion 1 and the rotational speed N2 of the rotary shaft 30, that is, the detected speed increasing ratio K (= N2 / N1) is determined, and further detected. The ratio between the speed increasing ratio K and the designed speed increasing ratio K0 of the planetary roller speed increasing mechanism is required. When the planetary roller speed-up mechanism is operating normally, K / K0 ≥ M (allowable value, for example 0.9
8) and no alarm signal is output from the rotation speed detection / comparison circuit 55.

The rotation speed detection / comparison circuit 55 illustrated in FIG.
The pulse frequency of the detection signal input to the F-V conversion circuits 55A and 55B is converted into a voltage signal and the F-V conversion circuit
The voltage signal from the conversion circuit 55A is adjusted to a voltage arbitrarily adjusted by the abnormal level setting potentiometer 55C,
The voltage is compared with the voltage from the FV conversion circuit 55B by the comparison element 55D. If there is no difference between the two, no alarm signal is output from the comparison element 55D.

During cutting / grinding, an overload due to cutting / grinding resistance or the like due to an excessive amount of cutting due to an erroneous operation of an operator or an abnormal shape of a workpiece, for example, causes a rotating shaft via a tool.
30, i.e., the sun roller part
A slip occurs between the outer peripheral surface of the planetary roller 32 and the outer surface 32.

As a result, the detected speed increasing ratio K (=
When N2 / N1) decreases and K / K0 <M, the rotation speed detection / comparison operation circuit 55 outputs an alarm signal to the light emitting diode drive circuit 56 and / or the signal output circuit 58. In the circuit of FIG. 4, the abnormal level voltage and F-V set by the abnormal level setting potentiometer 55C are set.
If there is a difference from the voltage from the conversion circuit 55B, the comparison element 55
A differential voltage signal, that is, an alarm signal is output from D to the light emitting diode drive circuit 56 and / or the signal output circuit 58.

The light emitting diode drive circuit 56 causes the light emitting diode 57 to emit light when an alarm signal is input, and the signal output circuit 58 sends an electric wave or infrared ray to an appropriate external alarm device when the alarm signal is input. The abnormal signal is output in the form. Therefore, the operator can visually and visually know the abnormal state of the overload occurrence by the light emission of the light emitting diode 57 and the alarm of the external alarm device. Also, when operating unmanned, an appropriate external stop mechanism may be provided to stop the drive in response to a signal such as a radio wave or infrared rays.

[0044]

In the tool adapter with the planetary roller speed-up mechanism of the present invention, when cutting / grinding is performed, the cutting amount becomes excessive due to an erroneous operation of the operator or an abnormal shape of the workpiece, resulting in an increase in the planetary roller increase. It is possible to detect slippage due to overload on the speed mechanism and prevent machining failure due to poor rotation of the tool and damage to the planetary roller speed increasing mechanism due to overload.

[Brief description of drawings]

FIG. 1 is a sectional front view of a tool adapter with a planetary roller speed increasing mechanism according to an embodiment of the present invention.

FIG. 2 is a perspective view of a planetary roller insertion hole and a drive pin of a tool adapter with a planetary roller speed increasing mechanism according to an embodiment of the present invention.

FIG. 3 is a block diagram of a rotation abnormality determination device for a tool adapter with a built-in planetary roller speed-up mechanism according to an embodiment of the present invention.

FIG. 4 is a circuit diagram of a rotation abnormality determination device for a tool adapter with a built-in planetary roller speed-up mechanism according to an embodiment of the present invention.

[Explanation of symbols]

1 Hollow shaft part 2 Groove part with groove 3 Tapered shank 4 Center hole 5 Insertion hole 6a, 6b Mounting groove 7a, 7b Shaft neck 7 Drive pin 9, 11 Deep groove ball bearing with seal 10 Planetary roller 15 Cap member 18 Annular groove 20 Hollow housing 21 Jacket groove 22 Ring-shaped fixed raceway surface 24 Coolant ejection port 25 Through hole 26 Jacket cover 31 Rolling bearing 30 Rotating shaft 32 Sun roller part 40 Anti-rotation device 50 Rotation abnormality determination device 51A First rotation speed sensor 51B No. 2 Rotation speed sensor 52 Generator 52a Permanent magnet piece 52b Generator coil 53 Power supply circuit 54A, 54B input circuit 55 Rotation speed detection comparison calculation circuit 55A, 55B FV conversion circuit 55C Abnormal level setting potentiometer 55D Comparison element 56 Light emitting diode Drive circuit 57 Light emitting diode 58 Signal output circuit

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hitoshi Iwamoto 3-5-8 Minamisenba, Chuo-ku, Osaka City Koyo Seiko Co., Ltd.

Claims (2)

[Claims] 1. A rotating part having an axial center hole formed in the first half part and the latter half part mounted on a spindle of a machine tool,
A fixed part, which is a hollow housing that is rotatably fitted and supported on the outer periphery of the front half of the rotary part and is engaged with and disengaged from the fixed side of the machine tool, and a fixed part that is inserted into the central hole of the rotary part. It is rotatable with respect to the rotating part, and the tool mounting part for attaching the tool to the tip part is assembled and configured via the planetary roller speed-up mechanism. First rotation speed detecting means for detecting, second rotation speed detecting means which is also provided on the fixed portion and detects the rotation speed of the tool mounting portion per unit time, and detection signals of the first rotation speed detecting means and second rotation speed detection A planetary roller provided with a rotation abnormality determination device that is connected so that the detection signal of the means is input and that outputs an abnormality signal when the speed increasing ratio of the rotation speed of the tool mounting portion to the rotation speed of the rotation portion is less than a predetermined value. Tool adapter with built-in speed increasing mechanism. 2. A rotor is provided on an outer peripheral portion of a front half portion of the rotating portion,
The tool adapter with a built-in planetary roller speed-up mechanism according to claim 1, wherein a stator is provided so as to face the hollow hole of the fixed portion, and a generator is configured as a power source of the rotation abnormality determination device.