JPS58143907A - Perforator - Google Patents

Abstract

PURPOSE:To prevent a drill from breaking and a motor from burning and to save the consumption of electric power by detecting the amount of load of the electric drill motor that varies according to the change of cutting resistance. CONSTITUTION:A detecting section having several variable resistors 19, 19', 26, 26' and change-over switches 32, 32 is provided on the operating circuit of the electrical drill 3 and the feed motor 4 in order to detect the amount of load as change of voltage. When a signal voltage exceeding the control level has been detected, the electrical power circuit of the feed motor 4 only or of the electrical drill 3 also interrupted. When an overload is applied on the running drill 3, the motor stops automatically to prevent its breakage.

Description

DETAILED DESCRIPTION OF THE INVENTION A drilling machine equipped with a means for fixing to a workpiece, for example, an electric trill with an annular cutter on the entire lower part of the electromagnetic base and on the front part, is different from the conventional drilling machine of this type equipped with a twist drill. Since the electric drill generates a large torque compared to the machine, if an abnormally large load is applied to the cutter, it is inevitable that accidents will occur, such as damage to the blade or complete burnout of the electric drill's motor. . Therefore, workers handling such drilling machines had to be careful not to put a large load on the annular cutter, but since it requires skill to visually assess the state of the load, the total number of accidents mentioned above has been reduced. The current situation is such that it is difficult to do so, and improvements have been desired. In addition, it is necessary to stop all operations immediately after drilling is completed in order to completely prevent breakage of the annular cutter and to reduce power consumption, but countermeasures have not been taken. The reality was that there was no such thing.

For example, in view of the fact that a drilling machine equipped with an annular cutter requires some experience in handling, the invention is to make it easy for even beginners to handle it, and to prevent breakage of the drilling tool and the motor of an electric drill. This is related to a drilling machine that was developed with the aim of preventing burnout and reducing power consumption.It detects the total load of the electric drill motor, which fluctuates according to changes in cutting resistance. When the load at the level set in the first stage is detected, the feed of the electric drill is automatically stopped to reduce the load, and then, when the reduction in load is detected, the feed of the drowsy drill is In the second stage, when an excessive load is detected, the feed of the drowsy drill and the electric drill are automatically stopped, and when drilling is completed, the electric drill and the feed are automatically stopped. It is expressed as a percentage.

The following is a description based on embodiments shown in the drawings.

Figure 1 is a right side view of the drilling machine that has implemented the invention, and Figure 2 is a schematic perspective view, where 1 is a frame, 2 is an electromagnetic base attached to the bottom of frame 1, and 3 is the front side of frame 1. 4 is a feed motor of the electric drill 3, 5 is a ring-shaped cutter attached to the arbor of the electric drill 3, and the operating circuit, which is the main part of the invention, is mounted on the frame. Built into 1.

FIG. 3 shows a block diagram of the maintenance circuit, and the operation circuit for the electric drill 3 and the feed motor 4 includes a first circuit that detects the load of the electric drill 3 as a change in the speed. The second detection section and both have 3.4 ON-OFF circuits.

Figure 4 shows an example of the operation circuit, and shows an AC current m, 8
I5C has a start switch 6 that also serves as an operation switch for the electromagnetic base 2 and an operation switch for the electric drill 3 and feed motor 4,
-The OFF circuit includes a start/stop circuit for the electric drill 3, a start/stop circuit for the feed motor 4, and a switching circuit for both operation circuits.
k! are doing.

First, the operating circuit of the electric drill 3 will be explained. The operating circuit includes a full-wave rectifier 7 that full-wave rectifies the AC voltage of the power supply.
and a smoothing circuit connected to the output side of the rectifier 7 and configured with a capacitor 8, resistors 9, 10 and a manufactured capacitor 1], and a first DC relay connected to the output of the smoothing circuit. 12, and when the relay is activated, the relay 1
The AC circuit is closed by the second contact 12', and the drive motor 3' of the electric drill 3 is rotated.

Next, the operation circuit of the feed motor 4 will be explained.
The same operation circuit is the contact 12' of the above-mentioned 1st IfL flow relay]2.
When closed, the first AC relay 13 is driven via the relay contact 2', and the feed motor 4 is connected in series with one contact 13-1 of the AC relay 13. It is made up of.

The first detection unit for the cutting resistance of the annular cutter 5 includes a resistor]5 provided in series with the drive motor 3' of the electric drill 3, and a transformer]6.
The manufactured full-wave rectifier consists of the resistor 15 and the detected voltage is the resistor 8, the resistor 19, and the resistor 15.
The voltage is divided by 0 and applied to the second DC relay 23 from both ends of the capacitor 21 via the first diode 22, and the resistance]
When the value of the terminal voltage of the electric drill 3 reaches the '1 voltage corresponding to the smaller first stage of the preset loads on the electric drill 3, the diode 22 is turned on, and the second diode 22 is turned on. The DC relay 23 is driven, the contact 23' of the relay 23 is closed, the second AC relay 24 is driven, and the power supply circuit of the feed motor 4 is cut off by the contact 24' of the relay 24, so that the full rotation of the feed motor 4 is stopped. By stopping the feed motor 4, the load on the drive motor 3' of the electric drill 3 can be completely reduced.

The second detection unit for the cutting resistance of the annular cutter 5 is the full-wave rectifier 1.
A silicon control element 3 is connected to one terminal of a voltage dividing resistor 25.26° 27, a capacitor 28, a second diode 29, and a capacitor 30 provided at the output end of the open side J element group. ], the cathode of the silicon control element 31 is connected to the other terminal of the capacitor 30, and the anode is connected to the smoothing circuit resistor 9 of the full-wave rectifier 7. ]0, and when the terminal voltage of resistor ]5 reaches the voltage corresponding to the second stage, which is set larger than the first stage J:1.
．． The front diode 29 and the silicon control element 3 are turned ON, and R1 [the input of the first DC relay 12 is short-circuited, and the contact point of the DC relay 12] 2' is surrounded, and the drive motor 3' of the electric drill 3 is closed. It is configured to stop the operation.

32 is a changeover switch that selects all load control levels that differ depending on whether a relatively small-diameter annular cutter is used or a large-diameter annular cutter, and one variable resistor] 9
, ] 9' increases due to an increase in load, and when the voltage across the capacitor 2 becomes higher than the voltage across the constant voltage diode 220, the constant voltage tlH diode 22 is turned ON and the second DC current is increased. A current flows through the coil of the relay 23 to activate it, and the contact 23' of the relay 23 closes.Subsequently, the A2 father-flow relay 24 operates, and the contact 2 of the relay 24, which was in the ON state, closes.
4' is turned OFF, the electrolytic corrosion circuit is cut off, and the feed motor 4
The rotation of the load is completely stopped, but the open side j level of the load is variable resistance 19°] By fine adjustment VC of 9', it is possible to adjust the diameter of the 4+! ! It can be applied to many annular cutlery 5 of various types.

Furthermore, is the F-syndrome changeover switch 32 an annular blade? This is a two-way switch that switches the entire second detection circuit that performs the second-stage determination of the cutting resistance of 15.

33 is an emergency warning rung, and 34 is a rotation speed regulator of the feed motor 4.

35 is a limit switch connected in parallel to the silicon control element 31, and the limit switch 35 is connected in parallel to the silicon control element 31.
It is fixed in the frame 1 so as to face the slide plate 36 that can be moved freely, and the mounting position 37 can be adjusted on the inner surface of the slide plate 36 in the direction of movement of the plate (up and down) using thumbscrews 38. The switch operation plate 37 is fixed at a fixed position between the upper and lower sides according to the thickness of the workpiece, and when the tip of the annular cutter 5 penetrates the workpiece, the switch operation plate 37 activates the limit switch 35. Operate and control system XI
The circuit of element 31 can be short-circuited.

39Vi electric drill's manual lifting/lowering operating handle, 4° is the operating handle for switch 6, and 41 is a switch that can be switched between automatic operation and full manual operation.

Next, the effect of non-invention will be explained using the above-mentioned fact #iψ1].

When the power switch 6 is turned on, the alternating current voltage of the alternating current electrolytic erosion is applied to the full-wave rectifier 7, and the full-wave rectified direct current voltage is formed by the capacitor 8, the resistor 9, 10, and the capacitor 11 connected in series. The voltage is applied to the coil of the first DC relay 12 through a smoothing circuit, and the relay 12 is activated and the contact 12' of the relay is turned ON. The above AC voltage is
In Tsukudaman, the electric power is applied to the drive motor 3' of the electric drill 3 to rotate the electric drill 3, and at the same time, the electric power is applied to the first AC relay 3, so that the contact 13-1 of the relay is turned ON.

J3-2 is turned OFF.

When the operation switch 14 of the feed motor 4 is turned on, the feed motor 4 rotates and, under the control of the speed regulator 34, rotates at a predetermined number of rotations, so that the electric drill 3 is prepared for planting grapes and begins cutting.

In the above cutting work, the load condition on the electric drill is η・＼.
If the control level is below a predetermined level, the work can be carried out without any problem, but for example, if the cutting edge of the annular knife 5 gets clogged with chips,
If a situation arises in which the material is not discharged, or if the machined hole becomes slightly deeper and a large load is applied to the cover machining, the load will exceed the predetermined secondary level.

In such a case, the cutting resistance of the 3° annular cutter 5 that detects the load state and controls the cutting operation as described below increases, and the load on the drive motor 3' of the electric drill 3 increases. As the current increases, the current flowing through the drive motor 3' rises, so if this impoverishment, that is, the rise in DC, is detected as a change in voltage by the resistor 15 connected in series with the drive motor 3', the corresponding Resistance] 50 The potential difference between the two terminals increases. 3 This acid level difference is boosted by a transformer 6 and converted into a full-wave rectified DC voltage by a full-wave rectifier 17.

Now, assuming that the selector switch 32 is switched to the state shown in FIG. Konotensor 21 is being charged.

When this signal voltage rises and reaches a photovoltaic voltage higher than the Zener voltage, a direct current flows through the constant voltage diode 22.
Applying the full signal current to the relay 23, the relay contact 23' (
5 is in the ON state, so father bft to relay 24
As the current increases, the relay contact 24' turns OFF.
The power supply circuit of the feed motor 4 is opened, and the feed voltage of the annular cutter 5 is
stops +)-.

Due to the above two operations, the load on the electric drill 3 gradually decreases, and eventually the constant voltage diode 22 becomes
When the voltage becomes equal to or less than the Zener voltage, the voltage applied to the relay 23 becomes 0, the relay contact 23' returns to its original state, and the contact 24' of the relay 24 closes the power supply circuit of the second feed motor 4. Then, start the feed motor 4 and rotate the annular cutter 5.
The cutting work will be resumed.

In the above process, if the effect of stopping the feed of the electric drill 3 and reducing the total load on the t' turtle drill 3 does not occur,
The signal current is boosted by the transformer 6 and full-wave rectified by the full-wave rectifier 17.
The voltage, r, 9 large signal voltage taken out by the TiJ variable resistor is proportionally distributed and photoelectrically applied to the capacitor 28.

In this case, when the voltage rises as the load rises and becomes higher than the Zener voltage of the constant voltage diode 29, 1 tonne pressure passes through the diode 29 and the alicon flil
The gate of the I#I flow element 3] is stamped, and as a result, the non-contact suppressing rectifier element 31 becomes conductive.

The silicon control element 3]: the anode is the full-wave rectifier]7
Since the cathode is connected to the point where the resistors 9 and 10 are connected to form a smoothing circuit, and the cathode is connected between one side of the capacitor 30, a voltage is applied to the gate of the capacitor 31.
When the contact #11 element 31 becomes conductive, the human power side 1 of the first DC relay 12 is short-circuited, and the relay 12
The contact 12' is turned OFF, the power supply circuit is cut off, and the drive motor 3' of the electric drill 3 is stopped. At this time, the drive current of the AC relay 13 is also cut off, and the relay
The contact 13-1 of No. 3 is turned OFF, the contact 13-2 is turned ON, and the emergency alarm lamp 33 is turned on.

In this way, when both the sending motor 4 and the electric trill drive motor 3' stop rotating and the emergency alarm lamp 33 lights up, the power is turned on to cut off the conduction state of the control element 31. Operate the circuit switch 6 to turn off the power circuit of the electric drill 3, return the electric drill 3 to the state before work, and remove the load <1° Drilling work is performed with the annular object 5 under a torque below a predetermined level. After completing the entire process, the tip of the annular blade ``!/J5 comes out on the F side of the -L crop and the drilling operation is completed. The switch operation plate 37 screwed onto the inner surface of the switch operation plate 37 is used to operate the limit switch 35, and all contacts of the switch are closed.As a result, the circuit of the silicon control element 31 is short-circuited, and the terminals of the first DC relay 2 are short-circuited. 2' becomes OFF, the power supply circuit is cut off, and the drive motor 3' of the electric drill 3 and the electric drill 3' All feed motors 4 are automatically stopped, and the drilling work is completely completed.

When moving the drilling machine to the pond F9T after the drilling work is completed, manually operate the drill bit 39 by rotating the handle 39 in the opposite direction.
Raise it twice and bring it out of all the holes of the annular knife.

Next, operate the switch 40 pieces and switch 6.
All fitting points k are turned OFF, and the electromagnetic base 2 attached to a part of the frame 10T is demagnetized. In this state, the drilling machine of the present invention can freely move to the next drilling position.

one! In addition, in the above-mentioned drilling work, if you want to switch from fully automatic load detection and electric drill feeding to manual operation, you only need to turn off the switch 41, and by this operation of switch 41, load detection and electric drill feeding will be automatic. Everything is done manually, and everything is done manually.

The above has been explained based on all the examples of non-invention, but non-invention:
Equipped with 3 electric drills that can be fixed vertically to the workpiece,
and a feed motor 4 for advancing the electric drill 3 toward the workpiece, and a number a for detecting the load of the electric drill as a large or small voltage change in the operating circuit of the electric drill and the feed motor. variable resistors 19 (1'), 26 (26') and changeover switches 32 and 32
i, and when a signal higher than the control level is brought by the detector, the power supply circuit of the remoter 4 only sends the signal k,'! Alternatively, if the power supply circuit of the electric drill 3 is also cut off along with the power supply circuit, and only the power supply circuit of the feed motor 4 is cut off, the signal voltage will not be generated.
A relay circuit is provided that automatically restarts full re-feeding when the drilling is completed, and furthermore, when the drilling of the workpiece is completed, the operation of the electric drill 3 and the feed motor 4 is omitted. Since it is equipped with a cut-off switch 35, if an excessive load is applied while using the electric drill 3, the overloaded operation will be automatically stopped to prevent damage to the cutting tool or twist drill. , completely prevents burnout of the drill motor, automatically starts drilling work when the load is removed, and automatically switches off the electric drill and feed motor after drilling is completed.
Since the 51st rotation is stopped, it also eliminates the cause of low operating efficiency that occurs with manual operation, consumes less power, and has the effect of allowing safe and smooth work to be carried out.

In addition, the detection of the signal voltage can be carried out steplessly using variable resistors 19 (19'), 26 (26') and changeover switches 32 and 32 attached to resistors 19 and 25, so that it can be carried out steplessly with different diameters. It can be widely applied as a maintenance measure for many types of annular cutting tools 5 and many types of twist drills with different diameters.

Patent number of the original patent application related to the 1980 patent application number] 86473
issue

[Brief explanation of drawings]

The drawings show one embodiment of the invention; Fig. 1 is a right side view, Fig. 2 is a perspective view showing an overview of the overall configuration, Fig. 3 is a block diagram of a maintenance circuit, and Fig. 4 is a detailed diagram. It is a circuit diagram. In the drawings, symbols]...Frame, 2...Electromagnetic base,
3...Electric drill, 3'...Drill motor, 4.
...Feed motor, 5...Drilling tool, 6...Start switch, 7゜17...Full wave rectifier, 8,11.2],
28.30... Capacitor, 9,15,18.20.
20'. 25.27.27'... Fixed resistance, 10, 12, 23
゜24...Relay,] 9, 19', 26. 26'
...Variable resistor, 22,29... Constant voltage diode, 3
]・Silicon @j element, 32...Selector switch, 3
3...Emergency warning lamp, 35...Limit switch,
36...Slide plate, 37...Switch operation board, 4
1... Selector switch. Figure 1 Snow Figure 2 Figure 3 Figure 4 Procedural amendment (spontaneous) May 7, 1981 1. Display of the case 1987 Patent Application No. 23741 2. Name of the invention Drilling machine a Case of a person making an amendment Relationship with Patent applicant 4, subject of amendment (IJ “Claims” column (1) of the specification
/+41 Scope of Claims Complete appendix (/1 correction and 7 o's. (2) σA [same operating circuit...contact 13-] Jffi listed on page 5, lines 5 to 8 in both specifications) Correct 9. ``The same operation circuit consists of contact 24B of second AC relay 24 connected in series with contact 23' of second DC relay 23,
Relay contact 24B" (3) Correct "24'" written in page 6, line 3, page 7, line 13, page 7, line 7 of the specification to read "r24 Bj" and omit it. 4) After "33" in the second line of page 8 of the specification, add "connected in series to contact 24AK of second AC relay 24". (5) Ming MfI, No. 9, No. 10~] - Correct the "○ that becomes 3-1..." in line 1 as follows. "13B turns OFF, and the emergency alarm lamp 330 circuit opens <0" (6) Specification page 10, line 20 to page 1] Page 1
Correct the statement in line ``24' is OFF,'' as shown below. ``24A is ON, 24B is OF, F', so when the emergency warning lamp 33 lights up, the i/CJ (7)
tJ[H! 'm12jli 313th line cr rl
3-1" to "1.3 B j," and "contact 13-2J to "1.3 B j."
Correct contacts 24A and 7'L of the second AC relay 24. (8) Delete everything "vertically" written on page 14, line 10 of the statement. 2 (9) All “advance movement” listed in the first line of the same page “advance”
I will correct it. [If the power supply circuit of the electric drill is shut off together with the same electric circuit, and at least the power supply circuit of the feed motor is shut off, when the signal voltage falls below the control level, Close the power supply circuit of the motor and ``restart the advance of the electric drill.'' A feed motor fitting for advancing the electric drill to the workpiece, a plurality of variable resistors and a changeover switch for detecting changes in the voltage of the total load of the electric drill in the operating circuit of the electric drill and the feed motor. When a signal voltage higher than the control level is brought by the detection section, only the power supply circuit of the feed motor is cut off, or the power supply circuit of the electric drill is also cut off along with the same electric N path. And, at least, a relay circuit is provided to generate a signal voltage when only the power supply circuit of the feed motor is cut off, and a switch is further provided to turn off the operating circuits of the electric drill and the feed motor when drilling into the workpiece is completed. Procedural amendment 1 (method) June 4, 1980 Patent Application No. 23741 of 1988 2, Name of the invention Drilling machine a Person making the amendment Assignment=Kaku's---=゛-=- [Additional related original patent application number 1982 Patent Application No. 1.8647
The invention of the original patent application No. 3 includes an electric drill that can be fixed vertically to a workpiece, and a feed motor for moving the electric drill forward and backward with respect to the workpiece. When the operating circuit of the feed motor includes a detection section that has multiple variable resistors and changeover switches that detect the load of the electric drill as large and small changes in voltage, and when a signal voltage higher than the control level is provided by the detection section. Then, cut off only the power supply circuit of the feed motor, or the power supply circuit of the electric drill together with the same electric circuit, and at least when only the power supply circuit of the feed motor is cut off, the signal voltage will automatically drop below the control level. A drilling machine equipped with a relay circuit that automatically starts retransmission. However, the invention of this application is an invention in which all of the matters essential to the structure of the invention of the original patent application are the main parts of the matters essential to the structure, and is different from the invention of the patent application. They achieve the same purpose. ” Procedural amendment (spontaneous) 1. Indication of the case Patent Application No. 23741 of 1982 2. Name of the invention Drilling machine a Relationship to the person making the amendment Patent applicant A Corrected Figure 4 as shown in the attached sheet 1 vinegar. "Voltage" stated in page 4, line 16 of the specification is replaced by "current"
I will correct it. 3. Specification page 4, line 20, page 6, line 19, 9
The text is corrected to "1st Jk "2nd" written on the 5th line of the page, the 9th line of the same page, the 8th line of the 12th page, and the 11th to 12th lines of the cylinder of the same page. ≠ Statement on page 5, lines 5 to 8 of the specification (May 7, 1982)
(Refer to the amended statement in paragraph (2) of the amendment to the date procedure amendment)
[Same operation circuit] Correct as described in contact 24Bjk-F. ``The same operation circuit includes a contact 24B of the first AC relay 24 connected in series to the contact 23' of the first DC relay 23, and a second Contact point 13AJ j of AC relay 13: "
"No. 2" is corrected to "No. 1" O 4 Mei a Letter written on page 8, line 2 (refer to the amended statement in paragraph (4) of the amendment in the procedural amendment dated May 7, 1980) "
Correct “No. 2” to “No. 1” C7 Specification No. 9 Part 1O
～・The statement on line 11 (refer to the amended text in paragraph (5) of the amendment in the procedural amendment dated May 7, 1980) “13B is...
····open. J'zCorrect and cut as above. "13A is turned on, and the relay contact 13B, which is connected in parallel to the contact 24A of the first AC relay 24 in the circuit of the emergency alarm lamp 33, is turned off." ~
14 Do The statement "13..." written on page 12, line 13 of the specification is corrected as follows. "Contact 13AU is OFF, contact 13B is ON, feed motor 4 is stopped,"

Claims (1)

[Claims] The electric drill is equipped with an electric drill that can be fixed vertically to the workpiece, and a feed motor for advancing the electric drill to the workpiece. A detection part waits for multiple variable resistors and a changeover switch to detect the load of the electric drill as large and small voltage changes, and when a signal voltage higher than the control level is brought to the detection part, the feed motor is activated. If only the power supply circuit or the power supply circuit of the electric drill is cut off along with the same electric circuit, and at least only the power supply circuit of the feed motor is cut off, the full feed will be automatically restarted when the signal voltage falls below the control level. This drilling machine is equipped with relay circuits in all stages and is further equipped with a switch that turns off the operating circuits of the electric drill and feed motor when the drilling of the workpiece is completed.