JP2004034225A - Removing mechanism of cutting strip in engraving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a removing mechanism for cutting strips which prevents oil lacking/oil scattering of/from a bearing by air blow for removing the cutting strip. <P>SOLUTION: The mechanism comprises: a spindle shaft 50 having a concave portion in which one end portion of a cutting tool is located inside; a second flow passage 40g extended in the direction which approximately crosses at right angles with an axial direction of the spindle shaft; an air supplying means of generating an air current flowing toward a lower aperture in the inside of the concave portion; and a reed valve 48 arranged at the upper side of a second bearing 44 which prevents the air supplied by the air supplying means from flowing inside the second bearing. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cutting piece removing mechanism in an engraving apparatus, and more particularly, to an engraving apparatus suitable for removing a cutting piece of an object to be engraved in a two-dimensional or three-dimensional engraving apparatus by numerical control. The present invention relates to a mechanism for removing a cutting piece in an apparatus.
[0002]
[Prior art]
Conventionally, a microcomputer, a cutting tool such as a cutter for cutting an object to be engraved such as a thermoplastic resin material or a light metal material, and the cutting tool described above under the control of the microcomputer relative to the object to be engraved. A driving device such as a motor capable of moving in a three-dimensional direction, and by controlling the microcomputer according to a predetermined program, by moving the cutting tool using the driving device, an arbitrary 2. Description of the Related Art An engraving device capable of engraving characters, figures, and the like is known.
[0003]
In a two-dimensional or three-dimensional engraving apparatus as described above, air blow is performed to remove cutting pieces such as cutting chips generated when a cutter as a cutting tool cuts an object to be engraved. Has been done.
[0004]
More specifically, in such an engraving apparatus, a cutting tool is supported by a rotating shaft rotatably supported via bearings on a main shaft of a tool head movably disposed. Then, a cutting piece attached to a rotating shaft or the like that supports the cutting tool is removed by air blow generated by air supplied at a predetermined pressure.
[0005]
However, in the above-described conventional engraving apparatus, air blow for removing cutting pieces may flow into the bearing that supports the rotating shaft, causing the bearing to run out of oil. However, there is a problem that the oil of the bearing may be scattered.
[0006]
In order to avoid running out of oil in the bearing in such a conventional engraving apparatus, it is conceivable to supply oil to the bearing together with air blow. However, in such a case, it is necessary to provide a circulating oil lubrication mechanism in the bearing part, which leads to new problems such as a complicated structure and an increase in cost, and the scattering of oil. It could not be solved.
[0007]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described various problems of the related art, and has as its object the purpose of removing the oil of the bearing or removing the oil from the bearing by air blowing to remove cutting pieces. An object of the present invention is to provide a cutting piece removing mechanism in an engraving device capable of preventing scattering.
[0008]
[Means for Solving the Problems]
Means for Solving the Problems To achieve the above object, an invention according to claim 1 of the present invention is formed in a substantially cylindrical body in a cutting piece removing mechanism in an engraving apparatus that cuts an object to be engraved by a cutting portion of a cutting tool. A spindle case, an inner peripheral opening extending in a direction substantially perpendicular to the axial direction of the spindle case and located on the inner peripheral side of the spindle case, and an outer peripheral opening located on the outer peripheral side of the spindle case. A first flow path that is open at the upper end of the spindle case; a first bearing disposed on an inner peripheral side of an upper end of the spindle case; a lower end of the spindle case; A second bearing disposed on an inner peripheral side between the inner peripheral side opening of the flow path and a substantially cylindrical body, and the first bearing and the second bearing form the second bearing; Spindle case One end of the cutting tool is rotatably supported on the inner peripheral side of the spindle case with a predetermined gap from the peripheral side, opened at the lower opening located at the lower end, and located inside. A spindle shaft having a concave portion, an opening in the concave portion extending in a direction substantially perpendicular to the axial direction of the spindle shaft and located in the concave portion of the spindle shaft, and an outer peripheral side on an upper side of the second bearing A second flow path that opens at a concave outer opening located at the outer peripheral side opening of the first flow path of the spindle case; and a second flow path of the first flow path of the spindle case. Air is supplied at a predetermined pressure into the concave portion of the spindle shaft through the second flow path of the spindle shaft to generate an airflow toward the lower opening inside the concave portion. And a reed valve disposed above the second bearing and configured to prevent air supplied by the air supply means from flowing into the second bearing. It is.
[0009]
Therefore, according to the first aspect of the present invention, when air is supplied at a predetermined pressure into the recess of the spindle shaft by the air supply means, an airflow toward the lower opening is formed inside the recess. However, since the reed valve is disposed above the second bearing, the air supplied by the air supply means is prevented from flowing into the second bearing, and the cut pieces are removed. It is possible to prevent the bearing from running out of oil and oil splatter due to air blow for removal.
[0010]
According to a second aspect of the present invention, in the first aspect, the reed valve is formed on an inner peripheral side of the spindle case above the second bearing. The second bearing is movably disposed in the concave portion, and is urged to the upper side of the second bearing by the pressure of the air supplied by the air supply means.
[0011]
Therefore, according to the invention described in claim 2 of the present invention, when air is supplied at a predetermined pressure into the recess of the spindle shaft by the air supply means, the reed valve is moved to the second position by the pressure of the supplied air. 2 is urged to the upper side of the bearing, so that the air supplied by the air supply means is prevented from flowing into the interior of the second bearing, and the bearing is run out of oil by air blow for removing cutting chips. And splashing of oil can be prevented.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an example of an embodiment of a cutting piece removing mechanism in an engraving device according to the present invention will be described in detail with reference to the accompanying drawings.
[0013]
FIG. 1 is a schematic structural explanatory view of an engraving apparatus provided with an example of an embodiment of a cutting piece removing mechanism in an engraving apparatus according to the present invention, and FIG. 2 shows the engraving apparatus shown in FIG. FIG. 3 is an explanatory cross-sectional configuration diagram of the spindle head, FIG. 3 is an enlarged cross-sectional configuration diagram showing the lower end side of the spindle head shown in FIG. 2, and FIG. 2 is an explanatory cross-sectional configuration diagram showing an enlarged part of the lower end side of the spindle head shown in FIG.
[0014]
The engraving device 10 illustrated in FIG. 1 includes a pair of substantially square pillar-shaped support portions 12L and 12R extending in a vertical direction and a bottom portion 12B that connects the support portions 12L and 12R, and the upper side is opened. U-shaped portal arm section 12, a substantially triangular prism-shaped rail section 14 having both ends 14L, 14R supported by a pair of support sections 12L, 12R of the portal arm section 12, and a rail section 14. A substantially rectangular parallelepiped head unit 16 attached to the head unit 16, a substantially rectangular spindle head 18 attached so as to be superimposed on the front side of the head unit 16, and projecting from the bottom surface side of the spindle head 18. A substantially rod-shaped cutting tool 20, a substantially rectangular plate-shaped frame portion 22 extending from the center of the bottom 12B of the portal arm portion 12 to the front side and the rear side, and a front side of the frame portion 22. Located each A switch panel portion 24 on which operation knobs and switches are disposed, and a width substantially equal to a width between a pair of support portions 12L and 12R of the gate-shaped arm portion 12 disposed on the upper surface of the frame portion 22 and in the width direction. And a tool case 28 which is placed on the upper surface 26a of the processing table 26 and accommodates the plurality of cutting tools 20. .
[0015]
In addition, substantially columnar support legs 30 are disposed at both end portions on the bottom surface side of the bottom portion 12B of the portal arm portion 12 and on the bottom surface side of the frame portion 12.
[0016]
Then, on the upper surface 26a of the processing table 26, the three-dimensional object to be engraved 100 formed of a thermoplastic resin material, a light metal material, or the like is fixedly placed.
[0017]
Here, the entire operation of the engraving device 10 is controlled by a microcomputer. The microcomputer controls the driving of a motor (not shown) according to a predetermined resolution, and the spindle head 18 supporting the cutting tool 20 is moved in the Z-axis direction (coordinates shown in FIG. The head 16 is moved along the rail 14 in the X-axis direction (see the reference diagram showing the coordinate system shown in FIG. 1), and the engraving object 100 is moved. The processing table 26 provided is moved in the Y-axis direction (see the reference diagram showing the coordinate system shown in FIG. 1).
[0018]
Therefore, the relative positional relationship between the cutting tool 20 supported by the spindle head 18 and the engraving object 100 is such that the cutting tool 20 can move in the X-axis direction and the Z-axis direction, and the engraving object 100 Since the cutting tool 20 can be moved in the Y-axis direction, the cutting tool 20 can be moved in three-dimensional directions with respect to the engraving object 100 in the X-axis direction, the Y-axis direction, and the Z-axis direction.
[0019]
Here, the cutting tool 20 is for cutting the object to be engraved 100, and has a substantially cylindrical body portion 20a, a blade portion 20b formed at a lower end portion as a cutting portion, and a body portion 20a. The tapered shank portion 20c has a substantially conical shape and a pull bottle portion 20d extending from the tapered shank portion 20c and having a projection 20e formed at an end thereof.
[0020]
In this embodiment, four types of cutting tools 20 differing only in the configuration of the blade portion 20b are housed in the tool case 28. Then, in the engraving device 10, the cutting tool 20 is automatically replaced such that one of the four cutting tools 20 is supported by the spindle head 18 under the control of the microcomputer. It is.
[0021]
The spindle head 18 supporting the cutting tool 20 includes a spindle case 40 formed in a substantially cylindrical body, and a bearing 42 disposed on an inner peripheral side 40b of an upper end 40a of the spindle case 40. The bearing 44 and the bearing 46 disposed on the inner peripheral side 40b of the lower end 40c of the spindle case 40, the reed valve 48 disposed on the upper side 44e of the bear link 44, and a substantially cylindrical body. And a spindle shaft 50 rotatably supported on the inner peripheral side 40b of the spindle case 40 via the bearings 42, 44 and 46, and fixed to the spindle shaft 50 using screws (not shown). Draw bolt 52 is provided.
[0022]
Here, the inner peripheral side 40b of the spindle case 40 has an inner diameter R2 near the upper end 40a (see FIG. 2) as compared with the inner diameter R1 (see FIG. 2) at a substantially central portion of the spindle case 40. And the inner diameter R3 (see FIG. 2) in the vicinity of the lower end portion 40c is larger.
[0023]
Note that the inner diameter R2 and the inner diameter R3 are substantially the same, and in the following description, “the inner side 40b in the range of the inner diameter R2” is referred to as “inner side 40b-R2” and “the inner side 40b-R2” in the following description. The “inner side 40b” is appropriately referred to as “inner side 40b-R3”.
[0024]
On the inner peripheral side 40b-R2 of the spindle case 40, a spring 54 is disposed for supporting the bearing 42, and the bearing 42 is disposed on the upper end 40a side.
[0025]
On the other hand, on the inner peripheral side 40b-R3 of the spindle case 40, the bearing 46 is disposed on the lower end 40c side, and the bearing 44 is disposed on the upper side 46e of the bearing 46.
[0026]
Here, the bearing 42, the bearing 44, and the bearing 46 have the same configuration, respectively, and have outer rings 42a, 44a, 46a, inner rings 42b, 44b, 46b, and rolling elements 42c, 44c, 46c. The gaps 42d, 44d, 46d between the outer rings 42a, 44a, 46a and the inner rings 42b, 44b, 46b are lubricated with grease for rotation of the rolling elements 42c, 44c, 46c.
[0027]
Then, the bearings 42, the bearings 44, and the bearings 46 are respectively provided on the inner peripheral side of the spindle case 40 such that the axial directions of the outer rings 42a, 44a, 46a and the inner rings 42b, 44b, 46b coincide with the axial direction of the spindle case 40. 40b. At this time, the gap 44d of the bearing 44 and the gap 46d of the bearing 46 provided on the inner peripheral side 40b-R3 of the spindle case 40 communicate with each other.
[0028]
Further, on the lower side of the spindle case 40, an inner peripheral side opening 40 d extending on the inner peripheral side 40 b and an outer peripheral side opening located on the outer peripheral side 40 e are extended in a direction substantially orthogonal to the axial direction of the spindle case 40. A channel 40g that opens at the portion 40f is formed.
[0029]
More specifically, the inner peripheral opening 40d of the flow path 40g is open on the inner peripheral side 40b above the inner peripheral side 40b-R3 of the spindle case 40. That is, the bearing 44 and the bearing 46 located on the inner peripheral side 40b-R3 are connected to the inner peripheral side 40b between the lower end 40c of the spindle case 40 and the inner peripheral opening 40d of the flow path 40g. It is arranged in.
[0030]
The spindle shaft 50 has a predetermined gap H (see FIGS. 2 and 3) with the inner peripheral side 40b of the spindle case 40, and the bearing 42, the bearing 44, and the bearing 46 move the inner peripheral side 40b of the spindle case 40. Is rotatably supported.
[0031]
At this time, the bearing 44 and the bearing 46 are positioned by a bearing nut 58 fixed to the outer peripheral side 50a of the spindle shaft 50 using a screw 56. A hole 60a is formed between the bearing nut 58 and the bearing 44 at a position corresponding to an opening 50g-1 outside the recess of the flow path 50h-1 to be described later. A spacer 60 having a hole 60b is provided at a position corresponding to the opening 50g-2.
[0032]
A draw bolt 52 is supported on the inner peripheral side 50 b of the spindle shaft 50 via a spring 62, and a concave portion 50 c is formed below the lower end 52 a of the draw bolt 52.
[0033]
The recess 50c is open at a lower opening 50e located at a lower end 50d of the spindle shaft 50. Further, the inside of the concave portion 50c is formed in a substantially conical shape according to the shape of the tapered shank portion 20c of the cutting tool 20 inserted from the lower opening 50e side.
[0034]
On the other hand, the lower end 52a of the draw bolt 52 located on the bottom 50f side of the concave portion 50c has a concave groove 52b for engaging with the projection 20e of the pull bottle portion 20d of the cutting tool 20 inserted from the lower opening 50e side, and a concave groove 52b. The steel ball 64 is provided in the groove 52b.
[0035]
The draw bolt 52 is movable in the Z-axis direction (see the reference diagram showing the coordinate system shown in FIG. 1) along the vertical direction of the head section 16 by adjusting the pressure of an air cylinder (not shown) and the spring force of a spring 62. It has been done. Further, a protrusion 50ff is formed on the bottom 50f side of the concave portion 50c of the spindle shaft 50 according to the position of the steel ball 64 disposed in the concave groove portion 52b of the draw bolt 52.
[0036]
Further, on the lower side of the spindle shaft 50, the opening 50 f extends in a direction substantially perpendicular to the axial direction of the spindle shaft 50, and is located inside the concave portion 50 c of the spindle shaft 50 and on the outer peripheral side 50 a. A flow path 50h (50h-1, 50h-2) that opens with the opening 50g outside the recess is formed.
[0037]
More specifically, the flow path 50h includes a flow path 50h-1 that is open at an opening 50f-1 in the recess near the bottom 50f of the recess 50c and an opening 50g-1 outside the recess on the outer peripheral side 50a. An opening 50f-2 in the recess near the bottom 50f of 50c and a flow path 50h-2 opening in the opening 50g-2 outside the recess on the outer peripheral side 50a. The opening 50g-1 outside the concave portion of the flow path 50h-1 is located on the outer peripheral side 50a of the upper side 44e of the bearing 44.
[0038]
Here, depending on the clearance H between the spindle shaft 50 and the spindle case 40 and the arrangement position of the bearings 46 and 44 on the inner peripheral side 40b-R3 of the spindle case 40, the outer opening 50g-1 of the recess 50g-1 of the flow path 50h-1. A hollow area A is formed on the side, and a hollow area B is formed on the side of the opening 50g-2 outside the concave portion of the flow path 50h-2.
[0039]
Therefore, the opening 50g-1 outside the recess of the flow path 50h-1, the hole 60a of the spacer 60 located at the opening 50g-1 outside the recess, and the flow path 40g of the spindle case 40 close to the opening 50g-1 outside the recess. Are located in the hollow area A. The outer opening 50g-2 of the recess of the flow path 50h-2 and the hole 60b of the spacer 60 located at the outer opening 50g-2 of the recess are located in the hollow area B.
[0040]
The reed valve 48 is disposed on the upper side 44e of the bear link 44, and is located in the area A and the area B.
[0041]
More specifically, the reed valve 48 is formed in a substantially ring-like body, and is sized to close the opening 44dd on the upper side of the gap 44d of the bearing 44. The reed valve 48 can be formed of, for example, a resin such as polyamide or a thin metal plate.
[0042]
The outer peripheral edge 48a of the reed valve 48 is located in a side recess 40bb formed on the inner peripheral side 40b-R3 of the upper side 44e of the bare link 44 of the spindle case 40, and the inner peripheral edge 48b is Is located in the locking concave portion 60c formed in the groove. Accordingly, the reed valve 48 is provided so as to be movable within the vertical recesses 40bb and the locking recesses 58c in the side recesses 40bb and the locking recesses 60c.
[0043]
Reference numeral 66 denotes an air pipe disposed in the outer peripheral side opening 40f of the flow path 40g of the spindle case 40, and is connected to an air supply means (not shown). Therefore, the air supplied at a predetermined pressure from the air supply means is configured to reach the flow path 40g from the outer peripheral opening 40f through the air pipe 66.
[0044]
A front lid 70 is disposed on the lower end 40 c side of the spindle case 40 via an intervening member 68. Reference numeral 72 denotes a flinger provided on the outer peripheral side 50a of the lower end 50d of the spindle shaft 50, and reference numerals 74 and 76 denote spacers. Reference numeral 78 denotes a pulley located at the upper end 40 a of the spindle case 40 and fixed to the spindle shaft 50 using screws 80.
[0045]
In the above configuration, when cutting the object to be engraved 100 in the engraving apparatus 10 described above, first, any of the cutting tools 20 housed in the tool case 28 is automatically controlled by the microcomputer. It is supported by the head 18.
[0046]
More specifically, the head section 16 moves in a predetermined direction, and the tool case 28 is located on the bottom side of the spindle head 18. Then, the spindle head 18 moves downward in the Z-axis direction, and the tapered shank portion 20c of the cutting tool 20 housed in the tool case 28 moves from the lower opening 50e side of the spindle shaft 50 into the recess 50c. Interpolated.
[0047]
Further, by adjusting the pressure of an air cylinder (not shown), the draw bolt 52 moves downward, and the projection 20e of the pull bottle portion 20d of the cutting tool 20 releases the steel ball 64 to the outside, and the concave groove portion 52b of the draw bolt 52 Fit inside. Then, when the pressure of the air cylinder is stopped, the draw bolt 52 moves upward by the spring force of the spring 62. At this time, the steel ball 62 moves inward in the concave groove portion 52b along the protrusion 50ff of the concave portion 50c, and the cutting tool 20 is fixedly supported by the spindle head 18.
[0048]
When the pulley 78 rotates by transmitting the torque of a motor (not shown) to the pulley 78 via a belt (not shown), the spindle shaft 50 rotates around the axis along with the rotation of the pulley 78, With the rotation of the shaft 50, the cutting tool 20 rotates around the axis.
[0049]
By moving the cutting tool 20 in a predetermined direction while rotating the cutting tool 20 in this manner, the object to be engraved 100 is cut by the blade 20 b of the cutting tool 20.
[0050]
Then, when the cutting of the object to be engraved 100 by the cutting tool 20 is completed, the cutting tool 20 supported by the spindle head 18 is housed in the tool case 28, and the spindle head 18 does not support the cutting tool 20. .
[0051]
At this time, cutting pieces such as chips generated when the cutting tool 20 cuts the object to be engraved 100 are attached to the spindle head 18, and air blowing is performed to remove these cutting pieces. . In FIG. 4, the airflow generated during air blowing is indicated by arrows.
[0052]
Air supplied from air supply means (not shown) flows into the flow path 40g from the outer peripheral opening 40f of the spindle case 40 via the air pipe 66. The air that has flowed into the flow path 40g reaches the inside of the concave portion 50c of the spindle shaft 50, the area A, and the area B via the flow path 50h of the spindle shaft 50.
[0053]
More specifically, the air that has flowed into the flow path 40g of the spindle case 40 reaches the area A from the inner peripheral opening 40d, passes through the hole 60a of the spacer 60, and passes through the concave outer opening 50g of the spindle shaft 50. 1 flows into the flow path 50h-1. The air that has flowed into the flow path 50h-1 reaches the inside of the recess 50c from the opening 50f-1 in the recess.
[0054]
Therefore, air is supplied at a predetermined pressure into the concave portion 50c of the spindle shaft 50, and an airflow toward the lower opening 50e is generated inside the concave portion 50c. By this airflow, the cutting pieces attached to the concave portion 50c of the spindle shaft 50 are removed to the outside from the lower opening 50e.
[0055]
Here, the air that has reached the area A from the flow path 40g of the spindle case 40 flows into the recess 50c through the flow path 50h-1, but does not flow into the bearings 44 and 46. Absent.
[0056]
More specifically, when the air supplied from the air supply means flows into the area A from the inner peripheral side opening 40d of the flow path 40g, the pressure of the flowed air causes the inside of the side recess 40bb and the inside of the locking recess 60c. The reed valve 48, which is movably disposed on the bearing 44, moves toward the bare link 44 and is urged toward the upper side 44e of the bearing 44.
[0057]
As a result, the reed valve 48 closes the opening 44dd on the upper side of the gap 44d of the bearing 44, and the air supplied from the air supply means flows into the bearings 44 and the bearings 46 such as the gaps 44d and 46d. It does not flow.
[0058]
In addition, the air that has reached the area A from the flow path 40g of the spindle case 40 flows into the recess 50c via the flow path 50h-1, and from the opening 50f-2 near the bottom 50f of the recess 50c. It flows into the flow path 50h-2. Then, the air that has flowed into the flow path 50h-2 passes through the hole 60b of the spacer 60 from the opening 50g-2 outside the recess, and reaches the area B from the opening 50f-2 outside the recess.
[0059]
At this time, in the area B, similarly to the area A, the pressure of the air flowing into the area B causes the reed valve 48 to move and urge the upper side 44e of the bearing 44 to close the opening 44dd of the bearing 44. The air supplied from the air supply means does not flow into the bearings 44 and the bearings 46 such as the gaps 44d and 46d.
[0060]
As described above, in the engraving apparatus 10 having an example of the embodiment of the cutting piece removing mechanism in the engraving apparatus according to the present invention, the reed valve 48 is arranged on the upper side 44e of the bear link 44 of the spindle head 18. Since air is not blown into the bearings 44 and 46 during the air blow for removing the cutting pieces, the grease of the bearings 44 and 46 is not blown off. It is possible to prevent the bearing from running out of oil and to prevent scattering to the outside.
[0061]
Further, according to the cutting piece removing mechanism in the engraving device according to the present invention, it is sufficient to simply dispose the reed valve 48 on the upper side 44e of the bare link 44, and the configuration is simple and inexpensive. Further, since it is not necessary to provide a mechanism for circulating oil lubrication in the bearing portion, problems such as a complicated structure and an increase in cost are not caused.
[0062]
Here, unlike a mechanism for removing a cutting piece in the engraving device according to the present invention, unlike the case where a reed valve 48 is disposed on the upper side 44e of the bare link 44, shielded bearings are used as the bearings 44 and 46. Use is also conceivable. However, even with such a shielded bearing, air may flow into the inside through a minute gap, and according to the cutting piece removing mechanism in the engraving device according to the present invention, the bearings 44 and 46 can be more reliably. The inflow of air into the inside can be prevented, and the grease of the bearings 44 and 46 is not blown off.
[0063]
In the engraving apparatus 10 provided with an example of the embodiment of the cutting piece removing mechanism in the engraving apparatus according to the present invention, the grease of the bearings 44 and 46 is not blown off by air blow. The operating state is kept good and high quality cutting can be performed.
[0064]
Further, in the engraving apparatus 10, since grease lubricated bearings such as the bearings 44 and 46 are used, the characteristics of the dry processing are utilized, and the engraving apparatus 10 can be used in an office environment or the like.
[0065]
Furthermore, in the engraving device 10, after the cutting tool 20 is replaced, the air blown, and the cut pieces attached in the concave portion 50c of the spindle shaft 50 are newly removed after being removed from the lower opening 50e to the outside. The cutting tool 20 is supported by the spindle head 18. For this reason, even during such an automatic tool change, the cutting tool 20 is accurately supported by the spindle head 18 without rattling of the cutting piece, and cutting with higher quality can be performed.
[0066]
The above embodiment can be modified as described in the following (1) to (4).
[0067]
(1) In the above embodiment, for example, when various dimensions are set as shown in FIG. 5 and air is supplied from an air supply unit (not shown) at about 0.7 l / sec, the reed valve 48 prevents the air from flowing into the bearings 44 and 46. Note that the supply amount of air from the air supply means may be changed according to the change in various dimensions.
[0068]
(2) In the above-described embodiment, the flow path 40g is provided, and the flow path 50h includes the flow path 50h-1 and the flow path 50h-2. However, the present invention is not limited to this. However, the position, size, number, and the like of the flow paths may be appropriately changed so as to generate an airflow capable of removing cutting pieces from the inside of the concave portion 50c of the spindle shaft 50. For example, the flow path 50h-2 may not be formed, or a shielding member that blocks an upward airflow in a predetermined gap H between the spindle shaft 50 and the spindle case 40 (see FIGS. 2 and 3). May be provided.
[0069]
(3) In the above-described embodiment, the reed valve 48 is provided so as to be movable in the side recess 40bb and the locking recess 60c. However, the present invention is not limited to this. And may be fixedly disposed on the upper side 44e of the bearing 44. It goes without saying that various bearings may be used as the bearings 44 and 46.
[0070]
(4) The above-described embodiment and the modifications described in (1) to (3) above may be appropriately combined.
[0071]
【The invention's effect】
Since the present invention is configured as described above, it is possible to prevent running out of oil in the bearing due to air blow for removing cutting pieces, and it is possible to prevent oil from scattering to the outside. To play.
[Brief description of the drawings]
FIG. 1 is a schematic configuration explanatory view showing an engraving apparatus provided with an example of an embodiment of a cutting piece removing mechanism in an engraving apparatus according to the present invention.
FIG. 2 is a sectional configuration explanatory view showing a spindle head of the engraving apparatus shown in FIG. 1;
FIG. 3 is an explanatory cross-sectional configuration diagram showing an enlarged lower end portion side of the spindle head shown in FIG. 2;
FIG. 4 is an explanatory cross-sectional configuration diagram showing an enlarged part of a lower end portion side of the spindle head shown in FIG. 2;
FIG. 5 is a diagram corresponding to FIG. 3, and is an explanatory diagram showing an example of dimension setting.
[Explanation of symbols]
10 Engraving equipment
18 spindle head
20 Cutting tools
40 spindle case
40g channel
42,44,46 Bearing
48 Reed valve
50 spindle shaft
50c recess
50e Lower opening
50h (50h-1, 50h-2) channel
52 draw bolt
100 sculpture

Claims (2)

In the removal mechanism of the cutting piece in the engraving device that cuts the object to be engraved by the cutting part of the cutting tool,
A spindle case formed in a substantially cylindrical body,
The spindle case is extended in a direction substantially perpendicular to the axial direction and opens at an inner peripheral opening located at an inner peripheral side of the spindle case and an outer peripheral opening located at an outer peripheral side of the spindle case. A first flow path;
A first bearing disposed on an inner peripheral side of an upper end of the spindle case;
A second bearing disposed on the inner peripheral side between the lower end of the spindle case and the inner peripheral opening of the first flow path;
The first bearing and the second bearing are formed in a substantially cylindrical body, and are rotatable toward the inner peripheral side of the spindle case with a predetermined gap from the inner peripheral side of the spindle case. A spindle shaft which is supported and has a recess in which an opening is formed at a lower opening located at a lower end and one end of the cutting tool is located therein;
An opening in the recess extending in the direction substantially perpendicular to the axial direction of the spindle shaft and located in the recess of the spindle shaft, and an opening outside the recess located on the outer periphery of the upper side of the second bearing A second flow path opening at and
The spindle shaft is disposed in the outer peripheral opening of the first flow passage of the spindle case, and is provided through the first flow passage of the spindle case and the second flow passage of the spindle shaft. Air supply means for supplying air at a predetermined pressure into the concave portion, and generating an airflow toward the lower opening inside the concave portion,
Removal of a cutting piece in an engraving device having a reed valve disposed above the second bearing and configured to prevent air supplied by the air supply means from flowing into the interior of the second bearing. mechanism. A removing mechanism of a cutting piece in the engraving device according to claim 1,
The reed valve is movably disposed in a lateral recess formed on an inner peripheral side of the spindle case above the second bearing, and is controlled by pressure of air supplied by the air supply unit. A cutting piece removing mechanism in an engraving device that is urged upward from the second bearing.

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