JPH0724165Y2 - Drill equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a drill device, and in particular, a drill for refueling an annular blade or a twist drill attached to an arbor of a drill device (electric drill). It relates to the device.

(Prior Art) A drill device provided with an annular blade, an electromagnet base for adsorbing the drill device onto a workpiece, and a feed having a feed motor for automatically feeding the drill device in the direction of the workpiece. Various types of drilling devices including a mechanism have already been proposed.

In such a drilling device that performs automatic drilling, cutting oil must be supplied (lubrication) to the annular blade. Therefore, the drill device is provided with an oil tank and an oil supply pipe (cutting oil introduction path) for supplying the cutting oil injected into the oil tank to the annular blade mounted on the arbor.

The oil tank is fixed to the frame of the drill device by an appropriate method.

(Problems to be Solved by the Invention) The above-described conventional technique has the following problems.

That is, as described above, in the conventional drill device, the oil tank is fixed to the frame of the drill device. Therefore, it is necessary to apply the cutting oil to the oil tank at the work site where the drill device is placed.For example, when the oil is injected into the oil tank, the cutting oil spills from the oil tank. If this happens, the work site may be polluted.

It is not impossible to move the drill device to a place other than the work site and lubricate it, but since the drill device is relatively heavy, it is necessary to move the drill device to a place other than the work site every time lubrication is performed. Is not desirable because it requires heavy labor on the operator and also reduces the efficiency of the drilling work.

The present invention has been made in order to solve the above-mentioned drawbacks, and the purpose thereof is to make it possible to easily inject cutting oil and to prevent a work site from being contaminated during lubrication. To provide.

(Means and Actions for Solving the Problems) In order to solve the above problems, the present invention provides an electric drill,
An oil tank device, a bracket to which the oil tank device is detachably attached, and cutting oil in the oil tank device, in a drill device having a cutting oil introduction path for supplying the cutting tool of the drill through the bracket, in the oil tank device, It is characterized in that an injection port that is opened when the bracket is attached and that is closed when the bracket is detached is provided, and that a valve is provided to prevent oil inside the tank from entering the vent passage of the injection port.

With this configuration, the present invention makes it possible to easily carry out the oiling work and prevent the work site from being contaminated due to oil leakage during tank mounting and perforation work.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 2 is a front view showing an embodiment of the present invention without an annular blade, FIG. 3 is a right side view of FIG. 2, and FIG. 4 is a left side view of FIG.

In each drawing, an electromagnet base 2 and a drill device 3 are attached to a frame 1. This drill device 3
Is moved up and down by the rotation of the feed motor 101 described later with reference to FIG.

The arbor 5 of the drill device 3 is integrally formed with the rotary shaft (spindle) of the drill device 3, and is rotatably supported by the bush 22 of the arm 21 attached to the electromagnet base 2 and is attached to the lower end thereof. Has an annular blade or a twist drill (not shown).

The bracket 1E is attached to the frame 1 by a male screw 1F. A cartridge type oil tank 4 is fixed to the bracket 1E.

Cutting oil (hereinafter simply referred to as “oil”) injected into the oil tank 4 by a method not shown in the drawings enters an oil sump 31 formed directly in the body of the drill device 3 through an oil cock 41 and a tube 42. It is introduced drop by drop. This oil is further passed through the tube 43 to form an annular groove formed in the case of the drill device 3 supporting the arbor 5.
Introduced in 37.

The oil introduced into the annular groove 37 is the inner wall 51 of the arbor 5.
Oil is supplied to an annular blade (not shown) fixed to the arbor 5 by flowing out to the inner wall 51 through an oil introduction port 52 bored in the.

Note that reference numeral 32 constitutes one wall surface of the oil sump 31, a transparent window made of glass, resin or the like for confirming the drip state of the oil introduced into the oil sump 31, and numeral 33 is an oil seal.

The drill device 3 is configured to be able to move up and down by turning on the manual lifting handle 6 after the clutch (ball clutch 120) described later with reference to FIGS. 5, 6, 12 is closed. Reference numeral 6A is a shaft, and 6C is a grip.

FIG. 5 is a sectional view of FIG. 3 taken along line ZZ, and FIG. 6 is an enlarged view of the vicinity of the harmonic drive (registered trademark) device 110 and the ball clutch 120 shown in FIG. In each drawing, the same reference numerals as those in FIGS. 2 to 4 represent the same or equivalent portions.

5 and 6, the main shaft of the feed motor 101 fixed to the base 1B of the frame 1 is rotated by a pinion gear 102, a spur gear 103, and the spur gear 103 fixed to its output shaft.
Spur gear 105 fixed to the same shaft 104 and spur gear
It is transmitted to a shaft 107 fixed to the spur gear 106 via 106. The reference numerals 141 and 142 denote the shaft 104.
, 143 and 144 are ball bearings for supporting the shaft 107.

Reference numeral 110 denotes a harmonic drive device as described above, which is a speed reducer of Harmonic Drive Systems Co., Ltd. This harmonic drive device 110
It is composed of a wave generator 111, a wave generator bearing 112, a flexspline 113, a circular spline S114 and a circular spline D115.

The wave generator 111 is an elliptical plate-like body (elliptical body) connected to the shaft 107 and having a plurality of wave generator bearings 112 arranged on the outer periphery thereof. The flexspline 113 has a plurality of gears on its outer circumference and is an annular body (elastic annular body) elastically deformed into an elliptical shape so as to be in close contact with the respective wave generator bearings 112. This flexspline 113 is, as will be described later, a circular spline S114 and a circular spline S114.
Since it is engaged with the spline D115, the shape of the flexspline 113 changes as the elliptical wave generator 111 rotates.

The circular spline S114 and the circular spline D115 are ring-shaped members each having at least an inner peripheral portion formed in a circular shape and having a plurality of teeth that engage with the teeth of the flexspline 113. The number of teeth formed on the circular spline S114 is the flex spline.
The number of teeth formed on the circular spline D115 is larger than the number of teeth formed on the 113, and is the same as the number of teeth on the flexspline 113. Further, the circular spline S114 is fixed to the base 1B.

Therefore, if the number of teeth of the circular spline S114 is larger than the number of teeth of the flexspline 113 by, for example, two, the flexspline 113 has a number of teeth relative to the circular spline S114 while the wave generator 111 makes one rotation. Rotate only a few sheets.

Further, since the number of teeth of the circular spline D115 is the same as the number of teeth of the flexspline 113, the circular spline D115 rotates at the same speed as the flexspline 113.

That is, the rotation of the shaft 107 is transmitted to the circular spline D115 with a high reduction ratio.

The engaging member 121 of the ball clutch 120 is the circular
Connected to spline D115. A front view and a vertical sectional view of the engaging member 121 are shown in FIGS. 7 and 8.

The engagement member 121 is composed of a tubular portion 121C and a flange 121B. A plurality of recesses 122 are formed on the inner wall of the cylindrical portion 121C as shown in the figure. The code 1
21A refers to the engaging member 121 as the circular spline.
It is a mounting hole for mounting to D115.

Referring back to FIGS. 5 and 6, the tubular portion 121 of the engaging member 121.
The outer wall of C is rotatably supported by the frame main body 1A to which the base 1B is fixed by ball bearings 145 and 146.

One end (a tubular body 124G) of a tubular clutch shaft 124, which is rotatably supported by the bush 128 with respect to the frame body 1A, is inserted into the tubular portion 121C of the engaging member 121.

9 is a vertical sectional view of the clutch shaft 124, FIG. 10 is a sectional view taken along line XX of FIG. 9, and FIG. 11 is a sectional view of FIG.
It is sectional drawing cut | disconnected by the -Y line.

In each figure, the one end 124 of the clutch shaft 124 is
G has a relatively large diameter in its inner peripheral portion 124A and its outer peripheral portion 124B so as to communicate with each other, at equal intervals around the clutch shaft 124 (9 with respect to the center axis of the clutch shaft 124).
Four first holes 124C are formed (every 0 degree), and four second holes 124C are equally spaced apart from the first holes 124C.
124E is formed. The first hole portion 124C and the second hole portion
124E is 45 with respect to the central axis of the clutch shaft 124.
Forming an angle of degrees.

In addition, the second hole portion 124E, in FIG. 5 and FIG.
It is hidden by the clutch ring 125, which will be described later, and is not shown.

An inner peripheral portion 124D having a smaller diameter than the inner peripheral portion 124A is formed from the one end 124G to the other end of the clutch shaft 124.

Returning to FIG. 5 and FIG. 6, an inner shaft 126 having a clutch ring 125 attached to its tip is further inserted into the clutch shaft 124. This insertion is performed so that the clutch ring 125 is arranged inside the inner peripheral portion 124A of the clutch shaft 124.

As shown in the drawing, two annular grooves (a first annular groove 125A and a second annular groove 125A) are provided around the clutch ring 125.
B) has been drilled. The distance between the first annular groove 125A and the second annular groove 125B is the distance W between the first hole portion 124C and the second hole portion 124E (9th hole) formed in the clutch shaft 124.
(See the figure).

A ball 123 is arranged in each of the first hole portion 124C and the second hole portion 124E formed in the clutch shaft 124.

Here, as shown in FIG. 12, when the first hole portion 124C and the second hole portion 124E face the first annular groove 125A and the second annular groove 125B of the clutch ring 124, respectively, Each ball 123 enters into the first annular groove 125A and the second annular groove 125B (hereinafter, this state is referred to as clutch off), but the first annular groove 125A and the second annular groove 125B of the clutch ring 125 are When the first hole 124C and the second hole 124E do not face each other, that is, as shown in FIG. 6, the first hole 124C
And the second hole portion 124E faces a larger diameter portion of the clutch ring 125 than the first annular groove 125A and the second annular groove 125B, the ball 123 is pressed by the large diameter portion and the clutch It protrudes from the outer peripheral portion 124B of the shaft 124 and engages in the recess 122 formed in the tubular portion 121C of the engaging member 121 (hereinafter, this state is referred to as clutch-on). As a result, the rotation of the engagement member 121 is transmitted to the clutch shaft 124.

Here, when the inner shaft 126 is moved from the state shown in FIG. 12 to the state shown in FIG. 6 (moved in the direction opposite to the direction of arrow V in FIG. 12), the ball 123 moves inside the recess 122. If it does not go in correctly, the spring 127 is compressed and only the clutch ring 125 maintains the state shown in FIG.
Then, after that, when the clutch shaft 124 is slightly rotated by the operation of the manual lifting handle 6, the ball 123 enters the recess 122 and the elastic force of the spring 127 causes the clutch ring 125 to move to the position shown in FIG. It becomes the state of. That is, the clutch is turned on.

In this embodiment, as will be described later with reference to FIG. 15, assuming that the feed operation of the drill device 3 at the time of drilling is performed by the forward rotation of the feed motor 101, after the drill device 3 has finished drilling. The return operation is the feed motor
Made by the reverse rotation of 101, this results in a ball clutch 1
The power transmission shaft (circular spline D115 in this example) to which 20 is connected is also reversed.

In such a case, for example, in the clutch disclosed in Japanese Patent Laid-Open No. 63-139605, the claws of the claw member of the example that constitutes the clutch are formed in a sawtooth cross section, so that rotation in only one direction is possible. Transmission is good, but rotation in the opposite direction is undesirable because it puts too much force on the clutch.

On the other hand, if the ball clutch 120 described above is used,
The transmission of both forward and reverse forces is always good.

Now, the other end of the clutch shaft 124 is
It is connected to the handle holding member 131. Here, although the inner shaft 126 is inserted in the clutch shaft 124, the inner shaft 1 is inserted by the pin 132.
An elongated hole 126C is formed in the inner shaft 126 so that the axial movement of the 26 is not hindered.

The clutch shaft 124 and the handle holding member 131 connected by the pin 132 constitute the shaft (rotation shaft) of the manual lifting handle 6.

The handle holding member 131 is rotatably supported by the bush 133 with respect to the frame body 1A.

The inner shaft 126 is formed with a first annular groove 126A and a second annular groove 126B.

A ball 135 is further arranged in the handle holding member 131. This ball 135 is biased toward the inner shaft 126 by a spring 136, and the first annular groove 126
It is engaged with one of A and the second annular groove 126B.

That is, as shown in FIGS. 5 and 6, when the clutch is on, the ball 135 is engaged with the first annular groove 126A and the inner shaft 126 is moved in the direction of arrow V in FIG. The first annular groove 126A and the second annular groove 12 are moved so as to engage the ball 135 with the second annular groove 126B when the clutch is disengaged as shown in FIG.
The formation position of 6B and the arrangement position of the ball 135 are set.

The shaft 6A having the grip 6C is provided on the handle holding member 131 so as to be rotatable around the pin 134. As shown in FIG. 3, in this example,
Three shafts 6A are provided.

A protrusion 6B is formed at the tip of the shaft 6A. The protrusion 6B is engaged with an annular groove 126D formed on the side of the inner shaft 126 opposite to the side on which the clutch ring 125 is attached. Due to this engagement, the grip 6C is 5th
When the shaft 6A is rotated about the pin 134 as a fulcrum so that the state shown by the solid line in the figure changes to the state shown by the chain double-dashed line, the inner shaft 126 moves in the direction of arrow V and the ball 135 Engagement of the first annular groove 126A to the second annular groove 1
Moving to 26B, the clutch is off.

Also, if you return the shaft 6A from this state to the state of the solid line,
The clutch is turned on.

The first annular groove 126A or the second annular groove 126B of the ball 135
The engagement of the clutch securely holds the on / off operation of the clutch.

Reference numeral 137 is a blind plate, and 138 is a screw for attaching the blind plate 137.

Further, in FIGS. 5 and 9, reference numeral 124F is a pinion formed on the clutch shaft 124. This pinion 124F is, as shown in FIG. 5, a frame main body 1A.
It engages with the clutch 3A of the drill device 3 which is slidably attached to the dovetail groove 1D formed in the. Therefore, if the ball clutch 120 is turned off and the manual lifting handle 6 is rotated, the drill device 3 is lifted and lowered by the rotation, and if the ball clutch 120 is turned on and the feed motor 101 is biased, the drill device 3 is automatically moved. Move up and down.

1C shown in FIG. 5 is a cover of the frame 1.

Further, in FIG. 5, the pin 132 connecting the clutch shaft 124 and the handle holding member 131 is drawn so as to be attached so as to penetrate the shaft 124, the handle holding member 131, and the inner shaft 126. However, the pin 132 is formed short, and the inner shaft 1
It may be attached so as not to penetrate 26. In this case, it is not necessary to form the elongated hole 126C in the inner shaft 126.

Further, although the clutch shaft 124 and the handle holding member 131 are separate components and are connected by the pin 132, the shaft 124 and the handle holding member 131 may be integrally formed.

Also, as shown in FIG. 9, the clutch shaft 124
Although the first hole portion 124C and the second hole portion 124E are formed in the axial direction, the first hole portion 124C and the second hole portion 124E are formed.
One of 124E may be omitted. By this omission, one of the first annular groove 125A and the second annular groove 125B formed in the clutch ring 125 can also be omitted, and the drill device with an electromagnet base can be further downsized.

The configuration of the ball clutch 120 is basically a tube in which a spherical body (ball 123) and a hole (first hole 124C and / or second hole 124E) for accommodating the spherical body are formed. The cylindrical body 124G (the end portion of the clutch shaft 124 on the harmonic drive device 110 side) and the spherical body.
Of the spherical body pressing means for pressing to the outside or inside (in this embodiment, the clutch ring 125 for pressing the ball 123 to the outside of the cylindrical body 124G) and the outside or inside of the cylindrical body 124G. An engaging member having a concave portion 122 that engages with a spherical body (in this embodiment, an engaging member 121 having a concave portion 122 that engages with a ball 123 protruding to the outside of the cylindrical body 124G on its inner peripheral portion). ) And 4 parts.

In such a ball clutch, the cylindrical body 124G
Since it suffices to be arranged between the spherical body pressing means and the engaging member, the engaging member may be arranged outside the cylindrical body 124G as in this embodiment, or It may be arranged inside the tubular body 124G.

Incidentally, as a matter of course, the engaging member is replaced with the cylindrical body 124G.
In the case of arranging on the inner side of, the concave portion 122 that engages with the ball 123 is formed on the outer peripheral portion of the engaging member, and the first annular groove 125A (and / or the second annular groove 125B) is It is formed on the inner peripheral portion of the clutch ring 125.

The driving source and the driven source of the power to be connected to the ball clutch 120 are the engaging member and the tubular body 12.
It should be connected to each of 4G. That is, in the above description, the engagement member 121 of the ball clutch 120 is the circular spline D of the harmonic drive device 110.
First hole 12 connected to 115 and for accommodating ball 123
The cylindrical body 124G in which the 4C and the second hole portion 124E are formed is formed on the clutch shaft 124. However, the cylindrical portion 121C of the engaging member 121 in which the concave portion 122 is formed is the clutch shaft 124. It is needless to say that the cylindrical body having the first hole portion 124C and the second hole portion 124E formed therein may be connected to the circular spline D115. The same applies when the engaging member is arranged inside the tubular body 124G.

Furthermore, the inner shaft 126 to which the clutch ring 125 is connected penetrates through the clutch shaft 124 and the handle holding member 131, and the inner shaft 126 is slid by the operation of the grip 6C to turn on / off the ball clutch 120. Although described as operating, the grip 6C is fixed to the handle holding member 131, and the inner shaft 126
The ball clutch 120 may be operated by directly operating the.

In addition, for example, the shaft 107 has a hollow structure, the inner shaft 126 is penetrated into the shaft 107, and the inner shaft 126 is operated, whereby the ball clutch 1
Of course, it is okay to operate 20.

Furthermore, in the above description, as shown in FIG. 5, the inner shaft 126 is formed with two annular grooves (first annular groove 126A and second annular groove 126B), and the ball clutch 120 is turned on. The ball 135 biased by the spring 136 is engaged with one of the two annular grooves by the ON / OFF operation. However, the present invention is not particularly limited to this, and only one inner shaft 126 is provided. The annular groove may be formed, and two balls may be arranged adjacent to each other and offset.

Now, next, the structure of the oil tank 4 and the oil
The outflow process up to the oil cock 41 will be described.

1 is a sectional view of the oil tank 4 and bracket 1E shown in FIG. 4, FIG. 16 is a sectional view of the oil tank 4, and FIG.
FIG. 18 is a cross-sectional view showing the cap 61 screwed into the oil tank 4 and its accessories, and FIG.
FIG. 19 is a cross-sectional view showing a state where 61 is attached, and FIG. 19 shows the oil tank 4 with the cap 61 attached to the bracket 1E.
It is sectional drawing which shows a mode that it fixes to. In each drawing, the same reference numerals as those in FIG. 4 represent the same or equivalent portions.

First, in FIG. 16, the oil tank 4 is made of resin or the like, and has an oil inlet 4B for injecting oil. A male screw 4A for screwing the cap 61 shown in FIG. 17 is formed on the outer periphery of the oil inlet 4B.

Next, referring to FIG. 17, the cap 61 is provided with an internal thread 61A on its inner peripheral portion and is provided with a bottomed tubular portion 61B at its central portion, as shown in the figure. The tubular portion 61B is provided so that an opening is formed in the cap 61 in a direction opposite to the side where the female screw 61A is formed, and the bottom portion thereof has a large diameter hole 61B.
C is drilled. The diameter of the large diameter hole 61C is set to be larger than the body outer diameter of the cylindrical body 63 described later.

The tubular body 63 has a through hole 63C, and a flange 63A is formed at one end thereof. Of the through hole 63C,
An inclined portion 63B is formed at the end on the side where the flange 63A is formed.

The tubular body 63 is inserted into the tubular portion 61B from the end on the side where the flange 63A is not formed, and is further inserted into the large diameter hole 61C. At the time of this insertion, the coil spring 67 is provided between the flange 63A and the bottom of the tubular portion 61B.
Are placed.

After inserting the tubular body 63 into the large diameter hole 61C, the packing 65 and the packing retainer 66 are fixed to the other end of the tubular body 63. By fixing this packing retainer 66, the coil spring
67 is always in a compressed state. The inner diameter of the packing 65 is set so as to be in close contact with the tubular body 63. As a result, the packing 65 and the bottom portion of the tubular portion 61B come into close contact with each other, and the tubular portion 6
The inner part of 1B and the inner part of cap 61 (the part where female screw 61A is formed) are sealed.

A tube 64 is attached to the other end of the tubular body 63, and a valve 68 made of rubber or a rubber-like material is attached to the tip of the tube 64. This valve 68
Are configured to always close the tube 64.

A gasket 62 is fixed to the cap 61.

Now, the oil inlet of the oil tank 4 shown in FIG.
Inject oil from 4B. The liquid level of this oil is shown by the chain double-dashed line in the figure.

Then, the cap 61 shown in FIG.
(See Fig. 18).

Next, the configuration of the bracket 1E will be described.

The bracket 1E is a first bracket for inserting the cap 61 attached to the oil tank 4, as shown in FIG.
It has a recess 71 and a second recess 72 formed in the center of the bottom of the first recess 71. The diameter of the first recess 71 is set to be substantially the same as the outer diameter of the cap 61, and the diameter of the second recess 72 is set to be substantially the same as the outer diameter of the tubular portion 61B formed in the cap 61. ing.

An annular groove is formed on the outer periphery of the second recess 72, and an O-ring 75 is arranged in the groove. In addition, the second recess 72
A columnar body 74 having a through hole 73A is planted at the bottom of the. An O-ring 74 is provided at the tip of the columnar body 73.

The oil cock 41 is attached to the bracket 1E so as to communicate with the second recess 72.

Now, as shown in FIG. 19, oil is injected into the bracket 1E having such a configuration, and the cap 61
The oil tank 4 to which is attached is fixed. This fixing is performed by turning the oil tank 4 upside down and lowering the oil tank 4 in the arrow P direction so that the cap 61 is inserted and arranged in the first recess 71 formed in the bracket 1E.

Here, even if the oil tank 4 is turned upside down, the packing 65
Also, since the bottom portion of the tubular portion 61B is in close contact, oil does not flow out from the large diameter hole 61C. Further, even if the liquid surface of the oil is located above the end portion of the tube 64, the valve 68 closes the tube 64, so that the oil does not flow out through the tube 64.

By the lowering of the oil tank 4, the tubular portion 61B of the cap 61 is inserted into the second recess 72 of the bracket 1E (see FIG. 1).

Here, as shown in FIG. 1, when the tubular portion 61B is inserted into the second recess 72, the inclined portion 63B of the tubular body 63 causes the O-ring 74 provided at the tip of the columnar body 73. Is pressed by.
As a result, the coil spring 67 contracts, the tubular body 63 moves in the direction of arrow S, and the packing 65 separates from the bottom of the tubular portion 61B.

As a result, the oil in the oil tank 4 becomes larger than the large diameter hole 61C.
Is introduced into the second concave portion 72 via. Therefore, when the oil cock 41 is opened, oil is supplied into the arbor 5 via the tube 42, the oil sump 31 and the tube 43 shown in FIG. The outflow path of oil from the oil tank 4 to the oil cock 41 is shown by an arrow R in FIG.

When the oil tank 4 is attached to the bracket 1E, as shown in FIG.
Since they come into close contact with each other, the through hole 73A, the through hole 63C and the tube
The insides of 64 and their outsides (oil side) are completely sealed. When the oil flows out, air is introduced into the oil tank 4 through the through hole 73A, the through hole 63C, the tube 64, and the valve 68 (direction of arrow Q). At the time of this air introduction, the valve 68 is opened.

The valve 68 is attached to the tip of the tube 64, but as shown in FIG. 20, the air reservoir is attached to the side of the oil tank 81 where the cap 61 is attached, that is, the oil inlet side. By forming 81A, the valve 68 is unnecessary. That is, if the oil tank
Even if the oil is filled into the oil filling port 81, the oil does not enter the air reservoir 81A. Therefore, even if the cap 61 is screwed and the oil tank 81 is turned upside down, A cavity corresponding to at least the volume of the air reservoir 81A is formed in the upper part of the oil tank 4, and the liquid level of the oil is lower than the tip of the tube 64 as shown by the chain double-dashed line in the figure. Will be located in.

Therefore, even if the valve 68 is not provided, oil rarely flows out through the tube 64 and the through hole 73A when the oil tank 81 is inverted.

Further, in the above description, the bracket 1E includes the first
The recess 71 and the second recess 72 are formed in the center of the bottom of the first recess 71, and the O-ring 75 for sealing is arranged in the second recess 72. The recess 71 is formed deep, the formation of the second recess 72 is omitted, and the first recess 72 is formed.
An O-ring for sealing may be arranged on the outer peripheral portion of 71.

Further, although the tube 64 is described as being attached to the tubular body 63, they may be integrally formed.

Furthermore, a coil spring 67 (compression coil spring) is arranged between the bottom portion and the flange 63A of the tubular body 63 in order to bring the packing 65 into close contact with the bottom portion of the tubular portion 61B. Instead of providing the compression coil spring, a tension coil spring may be provided between the tube 64 and the bottom of the tubular portion 61B.

Alternatively, the hole 61C may be set to have substantially the same outer diameter as the body of the tubular body 63, and a small hole for oil passage may be provided outside the hole 61C. This small hole can be closed by a packing 65.

Next, a control device of the drill device with the electromagnet base will be described.

FIG. 15 is a block diagram of an example of a control device to which an embodiment of the present invention is applied. In the figure, the terminals denoted by the reference numerals A and B are commonly connected by the same reference numerals.

In FIG. 15, reference numerals 598 and 599 are input terminals of the control device of the drill device with an electromagnet base.

The main switch 501 has two contacts (first contact 503 and second contact 504), and the first contact 503 is turned on by the first-step operation of the knob 501A (FIG. 4), and the second-step operation is performed. This turns on the second contact 504. As will be described later, when the first contact 503 is turned on, the electromagnet 506 is excited,
When the second contact 504 is turned on, the drill motor 515 and the feed motor 101 further rotate. The feed motor 101
Is a DC motor, and the drill motor 515 is an AC motor.

The pair of input terminals of the bridge rectifier 505 has a first contact 503.
And the input terminal 599. The pair of output terminals of the bridge rectifier 505 are connected to an electromagnet 506 provided in the electromagnet base 2.

The input terminal of the constant voltage circuit 507 is connected between the first contact 503 and the input terminal 599 via the diode and the resistor. The output terminal of the constant voltage circuit 507 is connected to the output terminal of a comparator 511 described later via a resistor 512 and a light emitting diode 513.

The pulsed reference voltage generation circuit 508 receives the output of the constant voltage circuit 507 and outputs a pulsed voltage of a predetermined value to the comparator 51.
Periodically output to the non-inverting input pin of 1.

The resistor 509 and the variable resistor 510 connected in series are the first
It is connected between the contact 503 and the input terminal 599. The resistance
The connection point between the 509 and the variable resistor 510 is connected to the inverting input terminal of the comparator 511.

The potential at the inverting input terminal of the comparator 511 is the resistance 509
And the resistance value of the variable resistor 510, and the output voltage of the AC power supply 500.

Therefore, only when the voltage of the AC power supply 500 is equal to or higher than a predetermined voltage, the potential of the inverting input terminal of the comparator 511 becomes higher than the output voltage of the pulsed reference voltage,
By setting the resistance value of the 509 and the variable resistor 510, and the output voltage of the pulsed reference voltage, when the output voltage of the AC power supply 500 is equal to or higher than the predetermined voltage, a pulse is generated from the pulsed reference voltage. The light emitting diode 513 lights up regardless of whether or not it is output.

Further, when the voltage of the AC power supply 500 is less than the predetermined voltage and the pulse is output from the pulsed reference voltage, the light emitting diode 513 is turned off. That is, the light emitting diode 513 blinks.

The pair of input terminals of the transformer 514 are connected to the second contact 504 and the input terminal 599. Further, the drill motor 515 is connected to the second contact 504 and the input terminal 599 via the contact b 547 of the main relay 546.

The CT transformer 516 generates a voltage according to the current flowing through the drill motor 515.

The output terminal of the transformer 514 is connected to a pair of input terminals of the bridge rectifier 517. The output terminal of the bridge rectifier 517 is connected to the constant voltage circuit 518.

The output of the CT transformer 516 is supplied to a full-wave rectifying / smoothing amplifier circuit 520 and a half-wave rectifying / smoothing amplifier circuit 521 via a low-pass filter 519. Therefore, the voltage output from the full-wave rectifying / smoothing amplifier circuit 520 and the half-wave rectifying / smoothing amplifier circuit 521 has a voltage value corresponding to the current flowing through the drill motor 515.

The output signal line of the half-wave rectifying / smoothing amplifier circuit 521 is a comparator 5
It is connected to the inverting input terminals of 54, 555 and 556, and the non-inverting input terminal of the comparator 557.

Also, a resistor 550 connected to the output line of the constant voltage circuit 518.
The respective parts C, D, E and F of the comparators 554, 555 and 5 are
It is connected to the non-inverting input terminal of 56 and the inverting input terminal of the comparator 557. Here, assuming that the potentials of C, D, E, and F are c, d, e, and f, these potentials have the relationship of the first expression.

c>d>e>f> 0 [V] (1) Further, light emitting diodes 558 to 561 are connected to the output lines of the comparators 554 to 557 through predetermined resistors, respectively.

Therefore, when the current of the drill motor 515 becomes almost 0 and the output voltage of the half-wave rectifying / smoothing amplifier circuit 521 becomes smaller than f, only the light emitting diode 561 is turned on.

Further, when the load applied to the drill motor 515 is light and the current value of the drill motor 515 is small, that is, when the output voltage of the half-wave rectifying / smoothing amplifier circuit 521 exceeds e, the light emitting diode 560 is turned on, and similarly. , The load is rather heavy,
When the current value of the drill motor 515 becomes slightly large and the output voltage of the half-wave rectifying / smoothing amplifier circuit 521 exceeds d,
Further, the light emitting diode 559 is turned on. Then, the load is very heavy, the current value of the drill motor 515 becomes very large, and the output voltage of the half-wave rectifying / smoothing amplifier circuit 521 becomes c.
When it exceeds, the light emitting diode 558 is further turned on. When the light emitting diode 560 is lit,
The light emitting diode 561 is turned off.

That is, the light emitting diode 561 corresponds to the drill motor 515.
Is a stop display LED that lights up when is stopped, and the light emitting diodes 558 to 560 are current level display LEDs that sequentially light up according to the current value flowing in the drill motor 515.

The input terminal of the bridge rectifier 582 is connected to the input terminal 599 and the second contact 504 of the main switch 501 via the b contact 547 of the main relay 546 and the triac 585. The triac 585 is controlled by a control signal output from a firing pulse generation circuit 581 described later.

The output line of the bridge rectifier 582 is a polarity inversion relay 5
It is connected to the feed motor 101 via a pair of contacts 583 of 34. When the bridge rectifier 582 outputs the pair of contacts 583, the drill device 3 is normally lowered, and the polarity reversing relay 534 is urged to raise the drill device 3. The bridge type rectifier 58
The polarity of the output voltage 2 is switched to control the rotation direction of the feed motor 101.

The firing pulse generation circuit 581 is connected to the input terminal 599 and the second contact 504 via the b contact 547. And
The firing pulse generation circuit 581 controls the triac 585 according to the potential applied to its control terminal 581A.

The output signal line of the full-wave rectifying / smoothing amplifier circuit 520 is connected to the inverting input terminal of the differential circuit 523. The output line of the feed speed reference voltage generation circuit 522 is the differential circuit 5
Connected to 23 non-inverting input terminals. The potential output from the feed speed reference voltage generation circuit 522 is set to a value larger than the maximum potential output from the full-wave rectifying / smoothing amplification circuit 520.

Since the output signal of the differential circuit 523 is a difference signal obtained by subtracting the output signal of the full-wave rectifying / smoothing amplifier circuit 520 from the output signal of the feed speed reference voltage generating circuit 522, the output signal of the differential circuit 523 is a drill signal. It is small when the current value of the motor 515 is large (when the load of the drill motor 515 is large), and conversely when the current value of the drill motor 515 is small (the drill motor 515
When the load is small), it becomes large.

The output signal line of the differential circuit 523 is connected to the negative output terminal of the constant voltage circuit 518 via the resistor 571 and the variable resistor 572 connected in series. This resistor 571 and variable resistor 5
The connection point J of 72 is a relay 532 for applying a quick return voltage which will be described later.
Is connected to the control terminal 581A of the ignition pulse generation circuit 581 via the contact 580 of the.

As will be described later, during normal drilling work, the transistor
Since 568 to 570 are off, the firing pulse generating circuit 581
Are controlled according to the potential of the output signal of the differential circuit 523. That is, when the load of the drill motor 515 is relatively large, the rotation speed of the feed motor 101 becomes small,
When the load of the drill motor 515 is small, on the contrary, the descending speed of the drill device 3 decreases, and the rotation speed of the feed motor 101 increases, and the descending speed of the drill device 3 increases.

The output signal line of the half-wave rectifying / smoothing amplifier circuit 521 is further connected to the non-inverting input terminals of the comparators 565 and 566, and the comparator.
It is connected to the inverting input terminal of 567.

Also, a resistor 564 connected to the output line of the constant voltage circuit 518.
Each part G, H and I of is connected to the inverting input terminals of the comparators 565 and 566, and to the non-inverting input terminal of the comparator 567. Here, assuming that the potentials of G, H, and I are g, h, and i, respectively, these potentials have the relation of the second equation.

g>h>i> 0 [V] (2) The output lines of the comparators 565 to 567 are connected to the bases of the transistors 568 to 570, respectively.

The emitters of the transistors 568 to 570 are connected to the negative output terminal of the constant voltage circuit 518.

The collectors of the transistors 570 and 569 are connected to one terminal of a normally closed test switch 575 through a diode 573 and a resistor 574, respectively. The collector of the transistor 568 is directly connected to one terminal of the test switch 575.

The other terminal of the test switch 575 is connected to the connection point J.
It is connected to the.

Here, the drill motor 51, such as before the drill starts drilling.
5 The load on the drill motor is very light and the drill motor 5
If the current value of 15 is small, the half-wave rectification smoothing amplification circuit 52
The output potential of 1 becomes lower than i, and the transistor 570 is turned on. By the ON operation of this transistor 570,
The diode 573 becomes conductive, and the voltage drop of the diode 573 in the forward direction lowers the potential at the connection point J. That is,
After the rotation of the drill is started and before the actual drilling of the workpiece is started, the diode 573 functions as a constant current element, and the control terminal 581
The potential of A decreases, the voltage value of the voltage supplied to the feed motor 101 decreases, and the rotation speed of the feed motor 101 decreases. That is, the feed rate of the drill device 3 becomes small (slow start).

When the drilling is started, the load on the drill motor 515 is increased, and the output potential of the half-wave rectifying / smoothing amplifying circuit 521 is higher than i and lower than h, all the transistors 56.
8 to 570 are turned off. As a result, the potential of the connection point J is divided by the resistance 571 and the variable resistance 572 into a differential circuit.
It becomes the output voltage of 523, and as described above, the drill motor 5
When the load of 15 is relatively large, the rotation speed of the feed motor 101 is small, and the descending speed of the drill device 3 is small. On the contrary, when the load of the drill motor 515 is small, the rotation speed of the feed motor 101 is small. As the size increases, the descending speed of the drill device 3 increases.

Next, the load of the drill motor 515 increases due to some factor, for example, a component edge formed on the edge of the drill, or defective discharge of chips, and the output of the half-wave rectifying / smoothing amplifier circuit 521. When the potential becomes higher than h, the transistor 569 is turned on, so that the potential at the connection point J is reduced by the voltage drop across the variable resistor 572. As a result, the rotation speed of the feed motor 101 decreases, and the descending speed of the drill device 3 decreases.

When the load of the drill motor 515 is further increased and the output potential of the half-wave rectification smoothing amplification circuit 521 becomes higher than g,
The transistor 568 is also turned on, and the potential of the connection point J drops to the level of the negative output terminal of the constant voltage circuit 518. That is, the potential of the connection point J is 0 [V]. Therefore, the potential of the control terminal 581A also becomes 0, and the triac 585 is not energized. That is, the feed motor 101
Rotation is stopped.

The output line of the half-wave rectifying / smoothing amplifier circuit 521 is connected to the non-inverting input terminal of the comparator 525. The output line of the reference voltage generating circuit 524 is connected to the inverting input terminal of the comparator 525. The output voltage of the reference voltage generation circuit 524 is set to a value approximately in the middle of the output voltage of each half-wave rectification smoothing amplification circuit 521 when the drill motor 515 is drilling and when it is not drilling. Has been done.

Therefore, when the drill motor 515 is not used for drilling and the drill motor 515 has no load, the output voltage of the half-wave rectifying / smoothing amplifier circuit 521 is the reference voltage generation circuit 524.
Below the output voltage of the comparator 525 produces no output. On the contrary, when the drill motor 515 is drilling and a load is generated in the drill motor 515, the output voltage of the half-wave rectifying / smoothing amplifier circuit 521 exceeds the output voltage of the reference voltage generating circuit 524. , The comparator 525 produces an output.

The instruction voltage generation delay circuit 526 outputs the output (instruction voltage) only when the time from the output of the comparator 525 to the stop thereof is longer than a predetermined time (for example, 1 to 2 seconds) set in advance. ) Occurs. That is, when the feed of the drill device 3 is manually performed before performing the automatic drilling and the drilling is performed by trial, the output signal of the comparator 525 is momentarily turned on. Therefore, the instruction voltage generation delay circuit 526 does not generate an output.

The output of the comparator 525 is turned on (starts drilling),
When turned off after a lapse of a predetermined time, the instruction voltage generation delay circuit 526 generates an output signal. The generation of this output signal means that the punching by the automatic feeding is completed.

The pulse generation circuit 527 generates a pulse by the generation of the output signal, and the pulse is latched by the latch circuit 528.

By this latch, the delay circuit 529 and the relay drive circuits 531 and 533 are energized.

FIG. 13 is a block diagram showing details of the instruction voltage generation delay circuit 526, the pulse generation circuit 527 and the latch circuit 528. 13, the same reference numerals as those in FIG. 15 indicate the same parts.

The output line of the comparator 525 is NOR (NOR) via the resistor 603.
It is connected to a pair of input terminals of the circuit 605. The output terminal of the NOR circuit 605 is one input terminal 60 of the NOR circuit 606.
Connected to 6B.

The output line of the comparator 525 is connected to the other input terminal 606A of the NOR circuit 606 via the resistor 601.

The input terminal 606A and the pair of input terminals of the NOR circuit 605 are grounded via capacitors 602 and 604, respectively.

The capacitances of the capacitors 602 and 604 and the electrical resistances of the resistors 601 and 603 are such that when the output of the comparator 525 changes from "0" to "1", the "1" is input to the input terminal 606A first. Then, a predetermined time (for example, 1
.About.2 seconds), and is set to be input to the pair of input terminals of the NOR circuit 605 with a delay. In other words,
Charging of the capacitor 602 is completed before the capacitor 604.

The output terminal of the NOR circuit 606 is connected to one input terminal 607B of the NOR circuit 607. The output terminal of the NOR circuit 607 is connected to a pair of input terminals of the NOR circuit 608.

The output terminal of the NOR circuit 608 is the NOR circuit 607.
To the other input terminal 607A, the delay circuit 529, and the relay drive circuits 531 and 533.

Next, the operation of the instruction voltage generation delay circuit 526, the pulse generation circuit 527 and the latch circuit 528 will be described with reference to FIG.

First, as shown in, when the drill motor 515 is not drilling (initial state), the output of the comparative drilling 525 is "0", and the point S (the input terminal 606 of the NOR circuit 606).
The potentials at A) and point T (a pair of input terminals of the NOR circuit 605) are also “0”. Therefore, the outputs of the NOR circuits 605, 606, 607 and 608 are "1", "0", "1" and "0", respectively.

Next, when the drill motor 515 starts drilling, the current value increases, so that the output of the comparator 525 changes from "0" to "1" as indicated by. At this time, the capacitor 602
Since the charging to and 604 has not been completed yet, the potentials at the points S and T remain “0”, and the outputs of the NOR circuits 605 to 608 do not change.

When the charging of the capacitor 602 is completed with a slight delay from the start of the punching, the potential at the point S becomes "1" as indicated by. However, at this point of time, since the capacitor 604 has not been charged yet, the potential at the point T remains “0”, and the outputs of the NOR circuits 605 to 608 do not change.

When the charging of the capacitor 604 is completed with a further delay from the start of punching, the potential at the point T also becomes "1" as indicated by. Therefore, the output of the NOR circuit 605 changes from "1" to "0".

However, since the potential at the point S is "1", the output of the NOR circuit 606 remains "0", and therefore the outputs of the NOR circuits 607 and 608 do not change.

When the drilling is completed, the current flowing to the drill motor 515 decreases, so that the output of the comparator 525 becomes "0" again as indicated by. At this time, the discharge of the capacitors 602 and 604 is not completed, so that the points S and T and the NOR circuit 60 are
The output of 5 to 608 remains unchanged (ie, similar to).

When the discharge of the capacitor 602 is completed with a slight delay after the completion of punching, the potential at the point S becomes "0" as indicated by. At this point, the discharge of the capacitor 604 is not completed, so the potential at the point T is "1" (that is, the output of the NOR circuit 605 is "0").

Therefore, the output of the NOR circuit 606 is "1", and the outputs of the NOR circuits 607 and 608 are "0" and "1", respectively.
That is, the delay circuit 529 and the relay drive circuits 531 and 53
A control signal indicating completion of punching is output to 3.

After that, as indicated by, the discharge of the capacitor 604 is completed, the potential at the point T becomes "0", and the outputs of the NOR circuits 605 and 606 are inverted. However, since the output of the NOR circuit 607 does not change, the output of the NOR circuit 608 does not change. That is, the output of the control signal indicating the completion of punching is latched.

By the way, after the state shown by, that is, when the charging of the capacitor 604 is not completed, when the drilling is finished (for example, when the manual trial digging is finished).
Immediately after that, since the discharge of the capacitor 602 is not completed, the potentials of the points S and T do not change as shown in, and after that, when the discharge of the capacitor 602 is completed, As described above, the potential at the point S is only inverted, and the outputs of the NOR circuits 605 to 609 do not change. That is, the control signal indicating the completion of punching is not output.

The capacitor 602 need not be provided in particular, but by providing the capacitor 602, the control signal indicating completion of drilling is output with a slight time delay after the current value flowing in the drill motor 515 becomes small. Become so. Immediately after the completion of drilling, chips may remain on the lower surface side of the work piece. However, the control device outputs the control signal with a time delay, so that the drill device 3
The rise of the chips is delayed, and as a result, the remains of the chips can be prevented as much as possible.

Returning to FIG. 15, the delay circuit 529 activates the fast return voltage generating circuit 530 after a predetermined time has elapsed from the activation. Due to this bias, the quick return voltage generation circuit 530 causes the drill device 3 to move.
A relatively high voltage signal is output so that the drill device 3 moves up at a speed faster than the feed speed when the drill moves.

The relay drive circuits 531 and 533 energize the quick return voltage application relay 532 and the polarity reversal relay 534, respectively, whereby the contact 580 is switched and the output signal line of the fast return voltage generation circuit 530 is connected to the control terminal 581A. Contact point 583
The polarity of the output of the bridge rectifier 582 supplied to the feed motor 101 is switched.

As a result, the feed motor 101 starts reverse rotation at high speed after the scheduled time has elapsed after the output of the instruction voltage generation delay circuit 526. As a result, the drill device 3 moves up at high speed.

Now, the output signal line of the half-wave rectifying / smoothing amplifier circuit 521 is
Further, it is connected to the non-inverting input terminal of the comparator 542.

Further, the output signal line of the constant voltage circuit 518 is a differentiation circuit 540.
It is connected to the. The differentiating circuit 540 differentiates the output signal of the constant voltage circuit 518, and when the differentiated signal is a predetermined value or more, the reference voltage output from the all-stop reference voltage generating circuit 541 (all-stop reference voltage). Voltage).
Then, when the differential signal becomes less than the predetermined value, the all-stop reference voltage is returned to the normal state. The all stop reference voltage is supplied to the inverting input terminal of the comparator 542.

The output signal of the half-wave rectification smoothing amplification circuit 521 is the drill motor 5
A large current (starting current) at the start of rotation of 15 causes a large instantaneous increase at the start of rotation. In this case, the output operation of the differentiating circuit 540 causes the output voltage of the all-stop reference voltage generating circuit 541 to be: It becomes higher than the output voltage of the half-wave rectifying / smoothing amplifier circuit 521. Therefore, the comparator 542 produces no output.

Even if the operation of the differentiation circuit 540 is stopped, the drill motor 5
Since the current value of 15 also decreases, the total stop reference voltage generation circuit 54
The output voltage of 1 remains higher than the output voltage of the half-wave rectifying / smoothing amplifier circuit 521.

However, when a large load is applied to the drill motor 515 in a steady operation state due to an unexpected factor, the output voltage value of the half-wave rectifying / smoothing amplifier circuit 521 exceeds the output voltage value of the all-stop reference voltage generating circuit 541. , Which causes the comparator 542 to generate an output.

Due to the output of the comparator 542, the main relay drive holding circuit 543 is energized, the main relay 546 is operated, and the b contact 547 is opened. Therefore, the rotations of the drill motor 515 and the feed motor 101 are stopped.

The operation of the main relay 546 is maintained until the power supply to the main relay drive holding circuit 543 is stopped. Power is supplied to the main relay drive holding circuit 543 until at least the second contact 504 of the contacts of the main switch 501 is opened.

The all-stop reference voltage generating circuit 541 includes a relay 589 described later.
The a-contact 590, the upper end detection switch 544, and the deviation detection switch 545 are connected in parallel to the negative output terminal of the constant voltage circuit 518. The upper end detection switch 544 is
It is configured to be turned on when the drill device 3 is raised to the uppermost position, and turned off otherwise. Further, the shift detection switch 545 is configured to be turned on at least instantaneously when the electromagnet of the drill apparatus with the electromagnet base shifts from the work piece.

When the a-contact 590, the upper end detection switch 544, or the shift detection switch 545 is turned on, the reference voltage generated by the all-stop reference voltage generation circuit 541 decreases to 0 [V], and the output of the half-wave rectification smoothing amplification circuit 521 is output. The main relay 546 operates regardless of the voltage value.

As described above, the upper end detection switch 544 is turned on when the drill device 3 is moved to the uppermost end position after the completion of drilling, but at the time of the next drilling, the operator of the drill device with the electromagnet base. Performs the descending operation of the drill device 3 in order to position the drill, which turns off the upper end detection switch 544, and the comparator 542
A predetermined potential is applied to the inverting input terminal of.
Therefore, the next punching is possible.

Further, the shift detection switch 545 can be composed of a tubular body, mercury enclosed in the tubular body, and a pair of contacts configured to project into the tubular body. When the switch configured as described above is attached to the electromagnet-based drilling device with the tubular body tilted so that the pair of contacts are located slightly above, the contacts are always off, and the electromagnet is When strong vibration is applied to the drill device with a base, mercury moves in the cylindrical body and the contact is momentarily turned on.

Further, the shift detection switch 545 can also be composed of a fixed contact and a movable contact arranged in proximity to the fixed contact by a spring-like means. Also in the switch having this structure, the fixed contact and the movable contact are momentarily turned on when strong vibration is applied to the electromagnet-based drilling device.

Now, the safety circuit 586 is configured by connecting a diode 587, a resistor 588 and a relay 589 in series, which are connected in parallel with the feed motor 101. The diode 587 is connected so as to be conductive when the feed motor 101 is rotating in the direction in which the drill device 3 descends.

The resistance value of the resistor 588 is such that when the feed motor 101 is rotating in the direction in which the drill device 3 descends,
The relay 589 is set to operate when a voltage substantially equal to or higher than the voltage value of the output voltage of the fast return voltage generating circuit 530 is applied between the two terminals.

That is, when the control device of the drill device with an electromagnet base is normal, the high voltage output from the quick return voltage generation circuit 530 is applied to the feed motor 101 only when the drill device 3 is raised. Due to controller failure,
If a voltage higher than the above voltage is applied to the feed motor 101 when the drill device 3 is lowered, the relay 5
89 operates, and thereby the a contact 590 is closed. As a result, the reference voltage generated by the all-stop reference voltage generation circuit 541 decreases to 0 [V], the main relay 546 operates, and the drill motor 515 and the feed motor 101 stop.

Now, in order to confirm whether or not the safety circuit 586 functions normally, the second contact 504 of the main switch 501 is closed, the test switch 575 is opened, and the variable resistor 572 is opened.
Is adjusted to increase the resistance value thereof, and the potential at the connection point J is increased so as to be substantially the same as the output voltage of the fast return voltage generating circuit 530. As a result, the voltage to be applied to the feed motor 101 after the completion of drilling is applied when the drill device 3 descends. That is, the test voltage for confirming whether or not the safety circuit 586 functions normally is applied to the feed motor 101.

Here, the test switch 575 is opened because the output voltage value of the half-wave rectifying / smoothing amplifying circuit 521 is low when the drill motor 515 is not drilling, the output voltage value is lower than the I potential, and the diode is Since the 573 becomes conductive, in this case, even if the resistance value of the variable resistor 572 is changed, the connection point J
This is because it is not possible to raise the potential of.

After confirming the operation of the safety circuit 586, after opening the second contact 504, the test switch 575 is closed again, and the variable resistor 572
Restore the resistance value of.

When the control device does not include the comparator 567, the transistor 570, and the diode 573, the test switch 575 is not particularly provided, but only by changing the resistance value of the variable resistor 572, The potential of the connection point J can be increased.

(Effects of the Invention) As is clear from the above description, according to the present invention, the following effects are achieved.

(1) The drilling device of the present invention can easily perform the oiling work by removing the oil tank, and can prevent the work site from being contaminated by oil leakage during the oil tank mounting and the drilling work. .

(2) The oil tank of the drill device of the present invention has a simple structure and can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a sectional view of the oil tank and the bracket shown in FIG. FIG. 2 is a front view showing an embodiment of the present invention with an annular blade omitted. FIG. 3 is a right side view of FIG. FIG. 4 is a left side view of FIG. FIG. 5 is a sectional view taken along line ZZ in FIG. FIG. 6 is an enlarged view of the vicinity of the harmonic drive device and the ball clutch of FIG. 5, and is a view showing a state where the ball clutch is on. FIG. 7 is a front view of the engagement member 121 of the ball clutch. FIG. 8 is a vertical sectional view of the engaging member 121 of the ball clutch. FIG. 9 is a vertical sectional view of the clutch shaft 124. FIG. 10 is a sectional view taken along line XX of FIG. FIG. 11 is a sectional view taken along the line YY of FIG. FIG. 12 is an enlarged view of the vicinity of the harmonic drive device and the ball clutch of FIG. 5, and is a view showing a state where the ball clutch is off. FIG. 13 is a block diagram showing details of the instruction voltage generation delay circuit, the pulse generation circuit and the latch circuit of FIG. FIG. 14 is a truth table of each logic circuit shown in FIG. FIG. 15 is a block diagram of an example of a control device to which an embodiment of the present invention is applied. FIG. 16 is a sectional view of the oil tank. FIG. 17 is a sectional view showing a cap screwed into the oil tank and its accessories. FIG. 18 is a sectional view showing a state in which a cap is attached to the oil tank. FIG. 19 is a cross-sectional view showing how an oil tank having a cap attached thereto is fixed to a bracket. FIG. 20 is a view showing another example of the oil tank. 1 ... frame, 1E ... bracket, 2 ... electromagnetic base, 3 ... drilling device, 4,81 ... oil tank, 4A ...
Male screw, 4B …… Oil inlet, 5 …… Arbor, 31 …… Oil sump, 32 …… Window, 37 …… Annular groove, 41 …… Oil cock, 42,43 …… Tube, 51 …… Inner wall, 52 ... Oil inlet, 61 ... Cap, 61B ... Cylindrical part, 61C ... Large diameter hole, 63 ... Cylindrical body, 63A ... Flange, 63B ... Inclined part,
63C ... through hole, 64 ... tube, 65 ... packing, 66
...... Packing retainer, 67 …… Coil spring, 68 …… Valve, 71…
… First recess, 72 …… Second recess, 73 …… Columnar, 73A ……
Through hole, 74, 75 ... O-ring, 81A ... Air reservoir, 101 ...
… Feed motor, 506… Electromagnet, 515… Drill motor

Claims (1)

[Scope of utility model registration request] 1. An electric drill having a drill motor, an oil tank device, a bracket to which the oil tank device is detachably attached, and a cutting oil introduction path for supplying cutting oil in the oil tank device to the blade of the drill through the bracket. The oil tank device includes an oil tank having an oil inlet, and an opening portion attached to the oil inlet and having a gap for passing cutting oil between the tubular member and the tubular member. A formed cap and a tubular body slidably attached through the opening of the cap and extending to the vicinity of the oil tank wall on the side opposite to the oil inlet, and the tubular body inside the oil tank. A valve provided at the end to prevent oil inside the tank from entering the tubular body, and a valve attached to the outer periphery of the tubular body so as to close the gap. And Kin, when leaving the oil tank device from the drill device, so that the packing closes the gap of the opening of the cap,
The bracket comprises a spring means for biasing the tubular body, the bracket includes a recess that fits into the cap, an oil outflow hole that communicates with the recess, and a through hole that is provided in the recess and communicates with the outside in the axial direction. And a columnar body that is fitted into the tubular body when the oil tank device is mounted and that pushes the tubular body into the tank against the force of the spring means. .