JP6465747B2 - Air blow device - Google Patents

Description

  The present invention relates to an air blowing device that blows away residues adhering to a workpiece by injecting air.

  Conventionally, an air blower that blows away residues such as chips and shot blasting balls remaining in the holes machined in a workpiece after machining or surface treatment of a workpiece made of a metal material, etc. An apparatus is known (see, for example, Patent Document 1).

JP 2012-82847 A

  However, the conventional air blow device is a gun type in which an operator pushes a trigger to inject compressed air and changes the direction of the gun body to control the air blowing angle and the blowing position. For this reason, a difference occurs in blow strength for each worker, or a difference occurs in the blowing angle and blowing position of air. Therefore, depending on the worker, it took time to remove the residue, or the residue could not be removed sufficiently.

  The present invention has been made paying attention to the above problems, and an object of the present invention is to provide an air blowing device capable of stably performing a residue removing operation from a workpiece by air blowing and improving the quality of the air blowing process. .

In order to achieve the above object, the present invention provides an air blowing device for air blowing a work having an axial main hole and a cross hole intersecting the main hole, a table on which the work is placed, a protrusion, and a switch And.
The protrusion is provided on a table and is inserted into a main hole of a work placed on the table.
The switch is provided on a table and is pressed by a work placed on the table.
And a projection part has an air blower opening which opens to an outer peripheral surface and opposes the inner surface of a main hole, and blows out air from this air blower outlet, when a switch is pushed.

In the air blow device according to the present invention, when the work is placed on the table, the switch is pushed by the placed work, and air is ejected from the air outlet of the protrusion inserted into the main hole of the work.
For this reason, the air injection amount and the air injection position and direction with respect to the workpiece are constant, and the work variation by the operator can be reduced. As a result, the removal operation of the residue from the work by air blow can be performed stably, and the quality of the air blow process can be improved.

It is a typical sectional view showing a continuously variable transmission which has a movable pulley which is a work in Example 1. 1 is a schematic cross-sectional view showing an air blow device of Example 1. FIG. It is a top view which shows the air blow apparatus of Example 1. FIG. It is sectional drawing which shows the state just before a work set in the air blow apparatus of Example 1. FIG. It is sectional drawing which shows a work set air blow state in the air blow apparatus of Example 1. FIG.

  Hereinafter, the form for carrying out the air blow device of the present invention is explained based on Example 1 shown in a drawing.

Example 1
First, the configuration of the air blow device according to the first embodiment will be described by dividing it into a “work configuration” and a “detailed configuration of the air blow device”.

[Work configuration]
FIG. 1 is a schematic cross-sectional view showing a continuously variable transmission having a movable pulley that is a workpiece in the first embodiment. Hereinafter, the configuration of the workpiece will be described with reference to FIG.

  In the air blowing device according to the first embodiment, the workpiece that is the object of air blowing is a movable pulley that constitutes a belt-type continuously variable transmission. Hereinafter, the belt type continuously variable transmission and the movable pulley will be briefly described.

  The belt type continuously variable transmission CVT includes a primary pulley connected to the input shaft, a secondary pulley connected to the output shaft, and a belt wound between these pulleys. The primary pulley and the secondary pulley each have a fixed pulley fixed to a shaft (input shaft or output shaft) and a movable pulley set to be movable in the axial direction of the shaft. Each of the fixed pulley and the movable pulley has a conical pulley body, and the inclined sheave surface of each pulley body is arranged opposite to form a V-shaped groove around which the belt is wound. To do. Then, by changing the distance between the fixed pulley and the movable pulley by moving the movable pulley in the axial direction, the groove width of the V-shaped groove increases and decreases, and the winding diameter of the belt is adjusted so that the primary pulley changes to the secondary pulley. The power transmission ratio, that is, the gear ratio changes.

As shown in FIG. 1, the movable pulley 1 (hereinafter also referred to as “workpiece”) includes a shaft portion 11 and a disk-shaped pulley body 12 (in a radial direction protruding from one end portion 11 a of the shaft portion 11. A cone portion).
The shaft part 11 is formed with a main hole 13 into which the shaft part 21 of the fixed pulley 2 is inserted and an intersecting hole 14 intersecting the main hole 13 along the axial direction. The cross hole 14 constitutes a hydraulic circuit for controlling the axial position of the movable pulley 1 (that is, the position of the movable pulley 1 with respect to the fixed pulley 2 and the gear ratio).
The pulley body 12 has a conical shape with one end portion 11a of the shaft portion 11 as an apex, a hydraulic pressure receiving surface 12a extending in a direction orthogonal to the axial direction of the shaft portion 11, and a hydraulic pressure receiving surface It has a sheave surface 12b (inclined surface) that extends in a direction inclined with respect to 12a and decreases the thickness of the pulley body 12 toward the outer edge portion. The sheave surface 12b faces the sheave surface 22b formed on the pulley body 22 of the fixed pulley 2, and a sheave surface 12b and a sheave surface 22b form a V-shaped groove around which a belt (not shown) is wound. Is done.

The main hole 13 has a first opening 13a opened at one end 11a of the shaft portion 11 and a second opening 13b opened at the other end 11b opposite to the first opening 13a. And penetrates the shaft portion 11 in the axial direction.
The cross hole 14 extends in a direction orthogonal to the axial direction of the shaft portion 11, and has an inner opening portion 14 a that opens to the inner side surface 13 c of the main hole 13 and an outer opening portion 14 b that opens to the outer peripheral surface of the shaft portion 11. And penetrates the shaft portion 11 in the radial direction. Here, a plurality of intersection holes 14 are formed around the main hole 13 here.

Further, a step portion 13d is formed in the middle of the inner side surface 13c of the main hole 13, and an inner diameter dimension R1 from the step portion 13d to the first opening portion 13a is from the step portion 13d to the second opening portion 13b. It is set to a value larger than the inner diameter dimension R2. That is, the opening area of the first opening 13a is larger than the opening area of the second opening 13b.
And the inner side opening part 14a of the cross hole 14 is open | released by the large diameter part from the level | step-difference part 13d to the 1st opening part 13a. The inner diameter R2 of the small diameter portion from the step portion 13d to the second opening portion 13b is set to be substantially the same as the outer diameter size of the distal end fitting portion 53 of the cylindrical portion 5 described later. Therefore, when the cylindrical portion 5 is inserted into the main hole 13, the tip fitting portion 53 of the cylindrical portion 5 is fitted into this small diameter portion, and between the large diameter portion and the outer peripheral surface 5 a of the cylindrical portion 5. A gap is secured.

  And the manufacturing process of the movable pulley 1 which is this workpiece | work includes a cutting process and the surface treatment process by shot blasting, and an air blow process. That is, in the cutting process, cutting waste may adhere to or remain in the main hole 13 or the cross hole 14. In the surface treatment process, the shot ball collided with the movable pulley 1 at the time of shot blasting becomes the main hole 13. Or may remain in the cross hole 14. For this reason, in the manufacturing process of the movable pulley 1, air is blown as a subsequent process of the cutting process or the surface treatment process (hereinafter referred to as “air blow”), so that residues such as cutting dust and shot balls are removed from the movable pulley 1. An air blowing step is provided for removal from the air.

[Detailed configuration of air blower]
2 and 3 show the air blowing device of the first embodiment. Hereinafter, based on FIG.2 and FIG.3, the detailed structure of the air blow apparatus of Example 1 is demonstrated.

  The air blowing device 3 shown in FIG. 2 is used in an air blowing process of the movable pulley 1 that is a workpiece, and removes residues by blowing air inside the main hole 13 and the cross hole 14. The air blow device 3 includes a table 4, a cylindrical portion 5 (protrusion portion), and a switch 6.

The table 4 is a work table on which the movable pulley 1 that is a work is placed, and includes a work placement surface 41 and a table-side air supply path 42.
The workpiece placement surface 41 is a flat surface formed on the upper side of the table 4 and is placed with the movable pulley 1 facing the sheave surface 12b. A cylindrical portion 5 is integrally formed on the workpiece placement surface 41, and a ring-shaped support member 43 surrounding the cylindrical portion 5 is detachably provided. Further, the work placement surface 41 is formed with a switch recess 44 in which the switch 6 can be placed and retracted.
Further, an internal switch 7a for controlling the valve 7 provided in the middle of the table-side air supply path 42 is exposed on the bottom surface 44a of the switch recess 44, and the switch 6 is moved in the protruding direction from the switch recess 44. A spring (not shown) for biasing is provided. The switch recess 44 is formed at a position covered by the sheave surface 12b when the movable pulley 1 is mounted on the workpiece mounting surface 41. Accordingly, the switch 6 is provided at a position where the switch 6 is pressed by the sheave surface 12 b of the pulley body 12 when the movable pulley 1 is mounted on the workpiece mounting surface 41.
The table-side air supply path 42 is formed inside the table 4, communicates with the air supply source A, and distributes the air supplied from the air supply source A. The valve 7 is an on-off valve that opens and closes the table-side air supply path 42. When the switch 6 is pushed against the biasing force of the spring and presses the internal switch 7a, the valve 7 is opened and the table-side air supply path is opened. Air is circulated in 42. Further, when the switch 6 is supported by a spring and does not press the internal switch 7a, the air flow in the table-side air supply path 42 is blocked due to the closed state.

The cylindrical portion 5 protrudes in a cylindrical shape from the workpiece placement surface 41 of the table 4, and is inserted into the main hole 13 of the movable pulley 1 when the movable pulley 1 is placed on the workpiece placement surface 41. In addition, a cylindrical part side air supply path 51 communicating with the table side air supply path 42 is formed inside the cylindrical part 5.
The cylindrical part side air supply path 51 includes a vertical part 51a extending in the axial direction of the cylindrical part 5 from the connection part of the table side air supply path 42, and a plurality of branch parts 51b bent in the horizontal direction from the tip of the vertical part. And have. Each branch portion 51 b opens to the outer peripheral surface 5 a of the cylindrical portion 5 and communicates with the air outlet 52 facing the inner side surface 13 c of the main hole 13.
Here, the plurality of air outlets 52 are set such that the height dimension from the support member 43 is substantially the same as the distance dimension from the first opening 13 a of the movable pulley 1 to the inner opening 14 a of the cross hole 14. ing. Further, the outer diameter R3 of the cylindrical portion 5 is set to substantially the same value as the inner diameter R1 of the small diameter portion of the main hole 13 of the movable pulley 1, and the vicinity of the tip (the portion indicated by the broken line) is the main portion. It is a tip fitting portion 53 (fitting portion) that fits into the small diameter portion of the hole 13.
The inner diameter dimension of the support member 43 is set to substantially the same value as the outer diameter dimension R3 of the cylindrical portion 5, and the cylindrical portion 5 is fitted inside the support member 43 (see FIG. 3).

  The switch 6 is disposed in the switch recess 44 and can be projected and retracted from the switch recess 44. That is, the switch 6 is supported by a spring disposed in the switch recess 44 in a state in which the tip portion protrudes from the switch recess 44. However, when the switch 6 is pushed against the urging force of the spring, the switch 6 It is immersed in the recess 44. The switch 6 presses the internal switch 7a when immersed in the switch recess 44.

  Next, the operation of the air blowing device of the first embodiment will be described by dividing it into “air blowing operation” and “other characteristic operations”.

[Air blow action]
FIG. 4 is a cross-sectional view showing a state immediately before a work set in the air blow device of the first embodiment, and FIG. 5 is a cross-sectional view showing a work set / air blow state in the air blow device of the first embodiment. Hereinafter, based on FIG.4 and FIG.5, the air blow effect | action of Example 1 is demonstrated.

  In the air blow process of the movable pulley 1 which is a workpiece, as shown in FIG. 4, the cylindrical portion 5 is inserted into the main hole 13 of the movable pulley 1 with the sheave surface 12 b facing the workpiece mounting surface 41. To lower. At this time, since the movable pulley 1 is not set on the workpiece placement surface 41, the switch 6 is supported by a spring, and the internal switch 7a is not yet pressed. Therefore, the valve 7 is in a closed state, and air flow in the table-side air supply path 42 is blocked.

  Thereafter, the sheave surface 12b comes into contact with the switch 6, and the switch 6 is pushed against the urging force of the spring as the movable pulley 1 is lowered. As shown in FIG. 5, when the movable pulley 1 is placed on the workpiece placement surface 41, one end 11 a of the movable pulley 1 is supported by the support member 43, and the cylindrical portion 5 is placed in the main hole 13. Fully plugged in. On the other hand, the switch 6 is immersed in the switch recess 44, and the internal switch 7a is pressed to open the valve 7. Thereby, the air supplied from the air supply source A flows through the table-side air supply path 42.

The air that flows in the table side air supply path 42 flows into the vertical portion 51a of the cylindrical portion side air supply path 51 formed inside the cylindrical portion 5, flows through a plurality of branch portions 51b, and from the air outlet 52. Be injected. Thereby, residues such as shot balls adhering to the inner side surface 13c of the main hole 13 can be blown away.
The blown residue in the main hole 13 passes between the cylindrical portion 5 and the inner side surface 13 c of the main hole 13 and falls onto the support member 43.

Further, a part of the air injected from the air outlet 52 flows into the cross hole 14 from the inner opening 14 a opened to the inner surface 13 c of the main hole 13, and enters the outer peripheral surface of the shaft portion 11 of the movable pulley 1. It blows out from the open outer opening 14b. Thereby, the residue adhering to the inside of the cross hole 14 can be blown off.
Note that the residue in the cross hole 14 that has been blown off falls onto the hydraulic pressure receiving surface 12 a of the pulley body 12.

  Thus, since the cylindrical portion 5 is inserted into the main hole 13 of the movable pulley 1 and the air outlet 52 faces the inner side surface 13c of the main hole 13, air is injected from the air outlet 52. Can be reliably sprayed onto the inner side surface 13 c of the main hole 13. Further, the switch 6 is pushed in by placing the movable pulley 1 on the workpiece placement surface 41, and while the switch 6 is pushed in, the internal switch 7a is pushed and the valve 7 is kept open. That is, while the movable pulley 1 is placed on the table 4, a certain amount of air is continuously ejected from the air outlet 52.

  As a result, the air injection amount and the air injection position and direction with respect to the movable pulley 1 become constant, and work variations by the operator can be reduced. As a result, it is possible to stably remove the residue from the movable pulley 1 by air blowing, and to improve the quality of the air blowing process.

  Further, the air injected from the air outlet 52 flows from the main hole 13 into the cross hole 14 and blows out from the outer opening 14 b of the cross hole 14. Therefore, air can be injected from the inside of the cross hole 14 toward the outside. Thereby, the residue blown off from the cross hole 14 can be prevented from entering the main hole 13.

[Other characteristic effects]
In the first embodiment, the main hole 13 formed in the movable pulley 1 that is a workpiece includes a first opening 13 a that opens to one end portion 11 a of the shaft portion 11 of the movable pulley 1 and the other end of the shaft portion 11. A second opening 13b opened to the portion 11b, and penetrates the shaft portion 11.
Thus, in the case of the main hole 13 penetrating the shaft portion 11, if a gap is generated between the outer peripheral surface 5 a of the cylindrical portion 5 and the inner side surface 13 c of the main hole 13, air leaks from the gap, and the air There is a possibility that the jetting power of the air jetted from the blowout port 52 is reduced.

  On the other hand, in the air blow device 3 of the first embodiment, the inner diameter R2 of the small diameter portion between the step portion 13d formed on the inner side surface 13c of the main hole 13 and the second opening portion 13b is the tip of the cylindrical portion 5. The outer diameter of the fitting portion 53 is set to be approximately the same as the outer diameter, and the tip fitting portion 53 is fitted to this small diameter portion. Moreover, while the inner side opening part 14a of the cross hole 14 opens to the large diameter part from the level | step-difference part 13d to the 1st opening part 13a, the height dimension from the support member 43 of the air blower outlet 52 is 1st. The distance between the opening 13a and the inner opening 14a is set to approximately the same value.

  Therefore, it is possible to prevent the air injected from the air outlet 52 from flowing from the second opening 13 b of the main hole 13 to the atmosphere, and to reliably distribute the air into the cross hole 14. Thereby, even if the position of the air blower outlet 52 and the inner side opening part 14a of the cross hole 14 does not oppose, the residue in the cross hole 14 can be blown away sufficiently. In addition, it is possible to prevent a reduction in the injection force of the air injected into the main hole 13, and it is possible to sufficiently remove the residue in the main hole 13.

Further, in the air blow device 3 according to the first embodiment, the conical pulley body 12 having the first opening 13a of the main hole 13 into which the cylindrical portion 5 is inserted as the apex is formed on the outer periphery of the movable pulley 1 that is a workpiece. ing. And the switch 6 provided in the table 4 is arrange | positioned in the position pressed by the sheave surface 12b which this pulley main body 12 inclined.
Therefore, the switch 6 is pressed by the movable pulley 1 as compared with the configuration in which the switch 6 is pressed by one end portion 11a of the shaft portion 11 of the movable pulley 1 (that is, the configuration in which the switch 6 is pressed by the end surface of the shaft portion 11). The operation can be performed stably.

  That is, when the movable pulley 1 is set on the work placement surface 41 of the table 4, it is expected that the shot ball spills out of the main hole 13 directed in the vertical direction. At this time, the spilled shot ball is likely to scatter around the cylindrical portion 5 and remain between the cylindrical portion 5 and the switch 6. Therefore, in the configuration in which the switch 6 is pressed by the end surface of the shaft of the movable pulley 1, the shot ball remaining between the cylindrical portion 5 and the switch 6 interferes with the end surface of the shaft of the movable pulley 1 and presses the switch 6. There is a possibility that the operation is hindered and the pressing cannot be performed properly.

  On the other hand, by providing the switch 6 at a position pressed by the inclined sheave surface 12b of the pulley body 12, a gap can be secured between the sheave surface 12b and the work placement surface 41 in the switch pressing state. Therefore, even if shot balls that have fallen down during work setting remain between the cylindrical portion 5 and the switch 6, the pressing operation of the switch 6 is not hindered. As a result, the switch 6 can be appropriately pressed, and the pressing operation of the switch 6 by the movable pulley 1 can be performed stably.

  In the case where the switch 6 is pressed by the end surface of the shaft portion of the movable pulley 1, a gap is generated around the switch 6 when the switch is pressed, and air leakage may increase by the amount of the gap. However, since the switch 6 is configured to be pressed by the sheave surface 12b, an extra gap is hardly generated between the end surface of the shaft portion, which is the peripheral edge of the main hole 13, and the workpiece placement surface 41, and air leakage is prevented. It suppresses and the fall of air injection force is prevented, and a residue can be removed more stably.

Furthermore, the air blow device 3 according to the first embodiment includes a support member 43 that is detachably attached to the table 4 and surrounds the cylindrical portion 5 and supports the movable pulley 1 placed thereon.
Here, when the use of the air blowing device 3 is repeated and the placement of the movable pulley 1 as the workpiece is repeated on the workpiece placement surface 41, the portion of the workpiece placement surface 41 that the movable pulley 1 contacts wears. End up.
However, by providing the support member 43 that supports the movable pulley 1 so as to be detachable with respect to the table 4, even if a portion that contacts the movable pulley 1 is worn, the support member 43 may be replaced. Can be easily maintained.

Next, the effect will be described.
In the air blow device of the first embodiment, the effects listed below can be obtained.

(1) In an air blowing device 3 for air blowing a work (movable pulley 1) having a main hole 13 along the axial direction and a cross hole 14 intersecting the main hole 13,
A table 4 on which the workpiece (movable pulley 1) is placed;
A projection (cylindrical portion 5) provided on the table 4 and inserted into the main hole 13 of the workpiece (movable pulley 1) placed on the table 4;
A switch 6 provided on the table 4 and pushed by the work (movable pulley 1) placed on the table 4,
The protrusion (cylindrical portion 5) has an air outlet 52 that opens to the outer peripheral surface 5a and faces the inner side surface 13c of the main hole 13, and the air outlet 52 when the switch 6 is pushed. From the air.
Thereby, the residue removal operation from the work (movable pulley 1) by air blow can be performed stably, and the quality of the air blow process can be improved.

(2) The main hole 13 passes through the work (movable pulley 1), a first opening 13a into which the protrusion (cylindrical part 5) is inserted, and a second facing the first opening 13a. An opening 13b,
The cross hole 14 has an inner opening 14a that opens to the inner side surface 13c of the main hole 13,
The protruding portion (cylindrical portion 5) is a fitting portion (tip fitting portion 53) that fits into a portion of the inner side surface 13c of the main hole 13 from the inner opening portion 14a to the second opening portion 13b. It was set as the structure which has.
Thereby, in addition to the effect of (1), the escape of air from the second opening 13b of the main hole 13 can be prevented, and the residue removal in the cross hole 14 can be sufficiently removed.

(3) On the outer periphery of the workpiece (movable pulley 1), there is a cone portion (pulley body 12) whose apex is the first opening 13a of the main hole 13 into which the projection (cylindrical portion 5) is inserted. Formed,
The switch 6 is arranged at a position pressed by the inclined surface (sheave surface 12b) of the cone portion (pulley body 12).
Thereby, in addition to the effect of (1) or (2), a gap can be secured between the inclined surface (sheave surface 12b) and the work placement surface 41 in the switch pressed state, and the work (movable pulley 1) Even when the residue falls from the main hole 13 and scatters around the cylindrical portion 5 at the time of setting, the residue does not hinder the switch pressing operation, and the quality of the air blowing process can be improved.

(4) The table 4 is provided detachably with respect to the workpiece placement surface 41, and includes a support member 43 that supports the workpiece (movable pulley 1). Thus, any one of (1) to (3) In addition to the effect of the above, the use of the air blow device 3 is repeated, and the work (movable pulley 1) is repeatedly contacted with the table 4, so that the work (movable pulley 1) is supported even if wear occurs on the table 4. Since the supporting member 43 to be replaced may be replaced, maintenance during wear can be facilitated.

  As mentioned above, although the air blow apparatus of this invention has been demonstrated based on Example 1, it is not restricted to this Example about a concrete structure, It deviates from the summary of the invention which concerns on each claim of a claim Unless otherwise, design changes and additions are permitted.

In the first embodiment, the stepped portion 13d of the inner surface 13c of the main hole 13 formed in the movable pulley 1 that is a work is provided, and the inner surface 13c of the main hole 13 is changed by changing the inner diameter dimension of the main hole 13 in the middle. Although the example which fits the front-end | tip part vicinity of the cylindrical part 5 was shown in this, it is not restricted to this. For example, a step portion may be formed on the outer peripheral surface 5 a of the cylindrical portion 5, and the fitting portion may be fitted into the main hole 13 with the tip portion having a large diameter. Further, a step portion is provided on both the inner side surface 13c of the main hole 13 and the outer peripheral surface 5a of the cylindrical portion 5, and the second opening portion 13b side of the main hole 13 and the tip end side of the cylindrical portion 5 are increased in diameter. Thus, a fitting portion that fits the inner side surface 13c of the main hole 13 may be formed between the intersecting position (inner opening portion 14a) of the main hole 13 and the intersecting hole 14 and the second opening portion 13b. .
Furthermore, at least one of the outer diameter dimension of the cylindrical part 5 and the inner diameter dimension of the main hole 13 is gradually increased without forming a stepped part, and the space between the inner opening part 14a and the second opening part 13b of the cross hole 14 is increased. A structure in which the cylindrical portion 5 is fitted to the inner side surface 13c of the main hole 13 may be employed.

In the first embodiment, the work to be air blown is the movable pulley 1 of the belt-type continuously variable transmission CVT shown in FIG. 1. For example, the fixed pulley 2 of the belt-type continuously variable transmission CVT is used as the work. In addition, the air blowing device of the present invention may be applied to the air blowing process of the fixed pulley 2.
Moreover, the workpiece | work should just be provided with the main hole along an axial direction, and the cross hole which cross | intersects a main hole, and is not restricted to the pulley of belt-type continuously variable transmission CVT. Furthermore, the intersecting hole may not extend in a direction orthogonal to the main hole. A hole communicating with the main hole is called a cross hole.

  Moreover, although the cylindrical part 5 which is a projection part showed the example which exhibits a cylindrical shape, it is not restricted to this. It may be a polygonal shape (such as a rectangular parallelepiped). Moreover, the pulley main body 12 which is a cone part provided in the outer periphery of the movable pulley 1 which is a workpiece | work is not restricted to a cone shape, The pyramid shape which makes one edge part 11a a vertex may be sufficient. Further, in this cone portion, the apex position may not coincide with one end portion 11 a of the shaft portion 11, and the apex of the cone portion may be arranged at an intermediate position of the shaft portion 11. That is, the pulley main body 12 may be provided in the middle of the shaft portion 11.

  Furthermore, although the support member 43 showed the example which exhibits the ring shape surrounding the cylindrical part 5 (projection part), it is not restricted to this. In the case where the support member 43 has a ring shape as in the first embodiment, the support member 43 is in contact with the entire circumference of the first opening 13a of the main hole 13 without gaps, and air leakage can be prevented. As long as the movable pulley 1 can be stably supported, it may be divided into a plurality of pieces.

1 Movable pulley (work)
11 Shaft part 12 Pulley body (cone part)
12b Sheave surface (inclined surface)
13 Main hole 13a 1st opening part 13b 2nd opening part 13c Inner side surface 13d Step part 14 Crossing hole 14a Inner opening part 14b Outer opening part 3 Air blow apparatus 4 Table 41 Workpiece mounting surface 42 Table side air supply path 43 Support member 5 Cylindrical part (protrusion)
5a Outer peripheral surface 51 Cylindrical part side air supply path 52 Air blower outlet 53 Tip fitting part (fitting part)
6 Switch 7 Valve

Claims (4)

In an air blowing device for air blowing a work having a main hole along the axial direction and a cross hole intersecting the main hole,
A table on which the workpiece is placed;
A protrusion provided on the table and inserted into the main hole of the workpiece placed on the table;
A switch provided on the table and pressed by the work placed on the table,
The protrusion has an air outlet opening on an outer peripheral surface and facing an inner side surface of the main hole, and blows out air from the air outlet when the switch is pressed. apparatus. In the air blow device according to claim 1,
The main hole has a first opening that penetrates the workpiece and into which the protrusion is inserted, and a second opening that faces the first opening.
The cross hole has an inner opening that opens to the inner surface of the main hole,
The protrusion has a fitting portion that fits into a portion of the inner side surface of the main hole from the inner opening to the second opening. In the air blow device according to claim 1 or 2,
On the outer periphery of the workpiece, a cone portion having the apex at the first opening of the main hole into which the protrusion is inserted is formed,
The air blower, wherein the switch is disposed at a position pressed by the inclined surface of the cone part. In the air blow device according to any one of claims 1 to 3,
The air blower, wherein the table includes a support member that is detachably provided on a work placement surface and supports the work.