JP4707886B2 - Processing unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a processing unit for processing non-metal workpieces such as metal and glass and synthetic resin with a tool (drill, tap, grindstone, etc.) rotated by an electric motor.
[0002]
[Prior art]
Conventionally, a machine as shown in FIG. 3 is known as a drilling machine composed of machining units.
As shown in FIG. 3, the drilling machine 20 includes an anchor 19 provided with a fixture 18 for fixing a workpiece 21, and an attachment provided perpendicularly to a cradle 24 so as to face the workpiece 21. A plurality of processing units 23 a, 23 b, 23 c disposed on the plate 22, guide rails 25, 25 for sliding the cradle 24 forward and backward in the front-rear direction (Z-axis), and one end at the bottom of the cradle 24 A ball screw 26 screwed into a nut 28 provided on the other end and connected to the motor shaft, a servo motor 27 for supplying a rotational driving force for rotating the ball screw 26, and coolant water and chips are prevented from scattering. Cover 29 and a coolant supply device (not shown).
[0003]
4 (a) is a cross-sectional view showing the inside of the conventional processing unit 23a shown in FIG. 3, FIG. 4 (b) is a left side view of FIG. 4 (a), and FIG. 4 (c) is a right side view. FIG.
As shown in FIG. 4, the machining unit 23a has a main shaft 31 with a tool attached to the tip (not shown) and a rotor 33 for generating a rotational driving force at the rear end, and the main shaft 31 at the tip. A bearing 35 pivotally supported on the side and the rear end side, a housing 36 pivotally supporting the main shaft 31 via the bearing 35, and a stator 34 fixed to the inner circumferential surface screwed to the outer circumferential surface of the housing 36. A housing (hereinafter referred to as a ram) 32, a holder 38 that holds a bearing 35 on the rear end side of the main shaft 31, and a cap 39 that fixes the holder 38.
[0004]
The rotation of the tool (not shown) provided at the tip of the spindle 31 of the machining unit 23a configured as described above causes a rotational force to be generated in the rotor 33 when a current flows from the motor cable 42 to the stator 34, The main shaft 31 integrated with the rotor 33 rotates freely. Then, the workpiece is machined by rotating a rotary tool provided at the tip of the spindle 31.
[0005]
Here, with reference to FIG. 4, the assembly procedure of the conventional process unit 23a is demonstrated.
The ram 32 is screwed onto a screw portion 36 c provided on the outer peripheral portion of the housing 36 after the stator 34 is fixed and integrated on the inner peripheral surface. Next, the bearing 35 is fitted into the holder 38 at the rear end of the main shaft 31 and the motor cable 42 is passed through, and then the holder 38 is inserted into the rear end portion of the main shaft 31 while being inserted from the rear end opening of the ram 32. To do. Next, the motor cable 42 is passed through the hole 39 b of the cap 39 and screwed into a screw portion 32 a provided on the inner peripheral surface of the rear end opening of the ram 32. Subsequently, the fixing ring 43 is arranged in accordance with the position of the screw hole 38 a of the holder 38, and the holder 38 and the cap 39 are fixed with the bolts 44.
The electric wire of the motor cable 42 is connected to the terminal block 45 provided inside the cap 39, and the electric wire is drawn out from the outlet 40 of the motor cable 42. Further, the end face of the cap 39 is covered with the cover 46 coated with a sealant.
The processing unit 23a is assembled and used by the above assembling procedure.
[0006]
[Problems to be solved by the invention]
However, as shown in FIG. 4A, in the conventional processing unit 23a, the processing variation of the screw portions 36c and 32a, that is, the screw portion 36c of the housing 36, the screw portions 32c and 32a of the ram 32, and the cap 39 4 (b) and 4 (c) due to variations in the positions of the screw cutting start positions, such as the screw portions 39a, and the position of the motor driving cable 42 when the stator 34 is fixed to the inner peripheral surface of the ram 32. There is a problem that the position of the cable outlet 40 of the cap 39 cannot be made uniform with respect to the mounting hole 36b of the square flange 36a of the housing 36 shown in FIG. For this reason, it is necessary to reassemble the tip end portion and the rear end portion of the ram 32 after disassembling and measuring the deviation amount (angle) each time. For example, when the screw pitch of the screw portion 36c of the housing 36 is 1.0 mm, and the amount of deviation of the outlet of the motor cable 42 is 45 ° as shown in FIG. By deleting 0.125 mm corresponding to 1/8 of one pitch (shortening the total length of the housing 36), the position of the motor cable can be changed just on the center line. Thus, by additionally processing the right end portion of the ram 32, the position of the motor cable outlet can be aligned directly below the position where the coolant is most difficult to enter.
In addition, when a plurality of machining units are arranged adjacent to each other by the user, the cable of the machining unit provided in the upper stage interferes with the lower machining unit, so that the outlet may be changed to a position other than directly below. When such an angle designation is received, similarly, additional work of the ram 32, disassembly and reassembly work are required. Such a problem becomes prominent particularly when the flange 36a is square. In addition, a square means polygons, such as a triangle, a quadrangle, a pentagon.
[0007]
Therefore, the present invention was devised to solve the above-mentioned problems, and in the positioning of the motor cable outlet, no additional work is required, and the motor cable outlet that can be fixed at an arbitrary angle is provided. It is an object of the present invention to provide a processing unit having an alignment mechanism.
[0008]
[Means for Solving the Problems]
The invention described in claim 1 was devised to solve the above problems, and is provided at a housing having a flange, a main shaft rotatably supported in the housing, and a rear end portion of the main shaft. A stator which is fixed to the inner peripheral surface of the housing with respect to the rotor and generates a rotational driving force, a cap which is provided with a cable outlet for drawing out the cable of the stator to the outside, and which covers the rear portion of the housing, and the cap A processing unit having an alignment mechanism provided at a rear end of the main shaft to align the cable outlet and the mounting hole of the flange. The alignment mechanism is fitted into the housing and is inserted into the housing. a holder for journalled a rear end of the main shaft, a nut and screwed into the housing for securing the holder with respect to the housing, the key Comprising a fastening member for fixing-up to the holder, and by fixing the cap to the holder with the fastening member fitted rotatably to the rear end opening of said housing, said with respect to the flange portion It is configured so that the position of the cable outlet can be changed.
[0009]
In the first aspect of the invention, the positioning mechanism for the motor cable outlet provided on the rear end side of the main shaft includes a holder for holding the bearing on the rear end side of the main shaft , and a nut that is a fixing means for fixing the holder to the housing. A cap having a cable outlet for motor drive, a cap whose outer peripheral thread portion has been abolished, a fixing ring that enables phasing of a bolt hole provided in an end surface of the holder, and a bolt for fixing these .
In this way, the nut , which is a fixing means that is provided by separating the outer peripheral thread portion from the conventional cap and independently, makes it possible to position the motor cable outlet at a specified angle without additional processing. since it is possible to fit, and down-cutting factory number of additional processing, decomposition, it is man-hour reduction of re-assembling work. In addition, the user can easily change the position of the motor cable outlet in accordance with the modified design .
[0010]
The invention described in claim 2 is the processing unit according to claim 1, wherein a groove is provided in each of the inner peripheral surface of the housing and the outer peripheral surface of the holder, and a ball is provided in the groove. The holder is configured to prevent rotation .
According to the second aspect of the present invention, the groove for disposing the rotation restricting member is provided on the inner peripheral surface of the housing and the outer peripheral surface of the holder, and the rotation restricting member is provided on the groove, thereby rotating the holder. And the disconnection of the cable due to the rotation of the holder can be prevented, so that quality control can be improved. The rotation restricting member is preferably a steel ball, which eliminates the need for a rubbing operation, so that the steel ball can be inserted with a small number of man-hours.
[0012]
A third aspect of the present invention is the processing unit according to the first aspect, wherein a groove formed on the outer peripheral surface of the holder, a ball disposed in the groove, and the ball are disposed in the groove. And ball holding means provided on the housing so as to be held in the housing .
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
1A is a cross-sectional view of the processing unit 1 of the present invention, FIG. 1B is a left side view of FIG. 1A, and FIG. 1C is FIG. 1A. FIG.
As shown in FIG. 1, the machining unit 1 includes a main shaft 2 having a tool mounted on a front end (not shown) and a rotor 3 that generates a rotational driving force at a rear end, and a main shaft 2. The bearing 5 that pivotally supports the front end side and the rear end side thereof, the housing 6 that pivotally supports the main shaft 2 via the bearing 5, and the stator 4 that is screwed to the outer peripheral surface of the housing 6 and is integrated with the inner peripheral surface. A ram 7, a holder 8 that holds the bearing 5 on the rear end side of the main shaft 2 that is an alignment mechanism of the outlet 11 of the motor cable 12, a nut 9 that fixes the holder 8, and a motor cable 12 And a cap 10 having an outlet 11.
[0015]
Hereinafter, the positioning mechanism of the motor cable outlet according to the present invention will be described in detail. As shown in FIG. 1A, the assembly procedure of the holder 8, the nut 9 and the cap 10 will be described. After passing the motor cable 12 through the through hole 8 b of the holder 8, the holder 8 into which the bearing 5 is inserted is inserted into the ram. 7 is fitted to the rear end side of the main shaft 2 while being fitted to the inner peripheral surface of the main shaft 2. Next, after passing the motor cable 12 through the hole of the nut 9 , the nut 9 is screwed to the screw portion 7 a provided on the inner peripheral surface of the ram 7 to fix the holder 8 to the ram 7 .
Next, the motor cable 12 is passed through the hole 10a of the cap 10, and the outlet 11 of the motor cable 12 of the cap 10 is placed on the vertical center line m between the left mounting hole 6b and the right mounting hole 6b of the flange portion 6a. (See FIGS. 1B and 1C). Subsequently, the fixing ring 13 is inserted in accordance with the position of the screw hole 8 c of the holder 8, and the cap 10 is fixed with the bolt 14. The motor cable 12 is connected to a terminal block 16 provided in the cap 10 and drawn out from the outlet 11 of the motor cable 12. The end face of the cap 10 is covered with a cover 17 to which a sealing agent is applied.
Thus, according to the positioning mechanism of the motor cable outlet, the motor cable outlet can be provided at a specified position without any additional processing.
[0016]
(Second Embodiment)
FIG. 2A is a cross-sectional view taken along the line BB of FIG. 1A showing a second embodiment according to the present invention, and FIG. 2B is an enlarged view of a ball portion. A groove 7b is provided on the inner peripheral surface of the ram 7, and a groove 8a is provided on the outer peripheral surface of the holder 8. For example, steel balls 15 are provided in the grooves 7b and 8a. Thereby, it is possible to prevent rotation of the holder 8, and it is possible to prevent disconnection of the motor cable 12 shown in FIG. 1A and to prevent the nut 9 from loosening, thereby improving reliability. It is.
FIG. 2C is an enlarged view of the ball holding member 15a. In order to make it possible to adjust the position of the ball 15, the ball holding member 15 a has a threaded portion on the outer periphery and holds the ball. Thereby, a tapped hole may be formed on the inner peripheral surface of the ram 7 instead of the groove 7b. Further, by rotating the ball holding member 15a, the V groove 8a ′ provided on the outer peripheral surface of the ball 15 and the holder 8 The gap can be eliminated.
[0017]
【The invention's effect】
According to the first and second aspects of the invention having the above-described configuration and action, the motor cable pulling position is provided by providing a motor cable lead-out position alignment mechanism comprising a holder, a nut and a cap. The position of the exit can be set to the specified angle with respect to the hole position of the round flange or square flange, and the position can be adjusted to the specified angle without additional work on the spot, reducing man-hours. Is possible. In addition, the user can easily change the position of the outlet of the motor cable in the machining unit accompanying the modification, so the modification can be easily performed.
[0018]
In addition, according to the first aspect of the present invention, since the screw part is separated from the cap and removed, the position can be adjusted to the designated angle in a freely rotatable manner, so that any angle designation of 360 ° is supported. Since it is possible to meet user needs, delivery time management becomes easy.
[0019]
According to the invention described in claim 2 , since the rotation of the holder can be prevented, the disconnection of the motor cable can be prevented, and the nut serving as the fixing means can be prevented from loosening. Further, since it is easy quality control, that linked to the improvement in reliability.
[Brief description of the drawings]
FIG. 1 shows a processing unit according to a first embodiment of the present invention, FIG. 1 (a) is a sectional view thereof, and FIG. 1 (b) is a left side view of FIG. 1 (c) is a right side view of FIG. 1 (a).
2 shows a rotation preventing portion of a holder of a machining unit according to a second embodiment of the present invention, and FIG. 2 (a) is a cross-sectional view taken along line BB of FIG. 1 showing the second embodiment of the present invention FIG. 2B is an enlarged view of the steel ball portion. FIG. 2C is an enlarged view of the ball holding member.
FIG. 3 is a perspective view showing a machining unit constituting a conventional drilling machine.
4 (a) is a cross-sectional view of a conventional processing unit, FIG. 4 (b) is a left side view of FIG. 4 (a), and FIG. 4 (c) is FIG. 4 (a). FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Processing unit 2 Main axis | shaft 3 Rotor 4 Stator 5 Bearing 6 Housing 6a Flange 6b Mounting hole 6c Screw part 7 Ram 7a Screw part 7b Groove 8 Holder 8a Groove 8a 'V groove 8b Through hole 8c Bolt hole 9 Nut 10 Cap 11 Pull-out port 12 Motor cable 13 Fixing ring 14 Bolt 15 Ball 15a Ball holding member 16 Terminal block 17 Cover

Claims (3)

A housing having a flange, a main shaft rotatably supported in the housing, and a stator for generating a rotational driving force fixed to an inner peripheral surface of the housing with respect to a rotor provided at a rear end portion of the main shaft A cap provided with a cable outlet for pulling out the cable of the stator to the outside, and a rear end of the main shaft to align the cable outlet of the cap and the mounting hole of the flange A processing unit having an alignment mechanism provided in
The alignment mechanism is a holder fitted into the housing and bearings the rear end side of the main shaft;
A nut for fixing the holder relative to the housing screwed into the housing,
A fastening member for fixing the cap to the holder ,
The cap is inserted into the rear end opening of the housing so as to be rotatable, and is fixed to the holder by the fastening member, so that the position of the cable outlet can be changed with respect to the flange. A processing unit characterized by 2. The structure according to claim 1, wherein a groove is provided in each of an inner peripheral surface of the housing and an outer peripheral surface of the holder, and a ball is disposed in the groove to prevent rotation of the holder. Processing unit.   A groove formed on the outer peripheral surface of the holder;
  A ball disposed in the groove;
  The processing unit according to claim 1, further comprising ball holding means provided in the housing so as to hold the ball in the groove.

Images