TW201313367A - Cutting machine - Google Patents

Abstract

When part of a human body enters an entry-prohibited region, a blade is reliably prevented from approaching the part of the human body in the entry-prohibited region. When a hand enters an entry-prohibited region in a state in which electric power of a tabletop cutting machine is turned on, a human-body detecting infrared sensor 7 provided on a front part of a holder 5 detects infrared rays generated by the hand or the like and outputs a restricting signal. As a result, the electric power supply to electromagnets embedded in the holder 5 is cut off, a pin 18 projects in a direction parallel to a shaft 12 by biasing of a spring, abuts a rib provided on a gear case 16, and restricts downward turning of a circular saw retaining part 13.

Description

Cutting Machine

The present invention relates to a cutting machine provided with a blade rotatable relative to a base portion and for cutting a material to be treated supported on the base portion.

Generally, when a material to be processed is cut by a desktop cutter, an operator pushes and fixes the material to be treated to a fence provided on a base portion, or a clamp device. To fix the material to be treated. An inaccessible mark is shown on the base portion to indicate an inaccessible portion. The operator must take care not to place the hand on the forbidden entry based on the forbidden entry mark while performing an operation.

If the width of the material to be treated placed on the base portion is narrow, the material to be treated does not cover the forbidden entry mark, and thus the entrance prohibited mark can be visually inspected. However, if the width of the material to be treated placed on the base portion is wide, the material to be treated covers the forbidden entry mark, so that the entry prohibition mark cannot be visually inspected. Therefore, when cutting the material to be treated, the circular saw that is moving downward sometimes approaches the hand that the operator uses to fix the material to be treated.

Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2008-173761) describes a stationary power tool (for example, a circular saw) provided with a proximity sensor, the proximity sensing The device is configured to detect the presence of an operator in a detection area. The proximity sensor output corresponds to a detection result and an electrical detection signal.

Warnings achieved by light or alarm sounds have a certain effect. However, it is possible that the operator will not notice the warning of light or alarm sound.

It is an object of the present invention to reliably prevent a blade from approaching a moving object, particularly a portion of a human body, that enters the forbidden access area.

One aspect of the invention is a cutting machine. The cutting machine comprises: a base portion for supporting a material to be treated; a support member disposed on the base portion; a blade holding member rotatably supported by the support member; and a blade The blade holding member is fixed, and the cutting machine is characterized in that: a detecting sensor for detecting whether a part of a moving object exists in one of the prohibited entry areas set on the base portion; and a rotation limit And configured to restrict the blade holding member from rotating toward the base portion when the detecting sensor detects that the portion of the moving object exists in the forbidden entry region.

The rotation restricting portion may have a restricting member protruding to the one of the blade holding members toward the base when the detecting sensor detects that the portion of the moving object exists in the forbidden entry region In the path of the rotation.

At least one restriction portion may be disposed on the blade holding member, the at least one restriction portion being latchable with the restriction member.

At least one limiting hole portion may be disposed on the blade holding member, the limiting member may be Inserted into the at least one restriction hole portion.

The rotation restricting portion may include: a biasing portion disposed between the supporting member and the restricting member, and biasing the restricting member in a protruding direction; a attracting portion including an electromagnet and generated by a magnet One of the attractive forces resists the biasing action of the biasing portion to hold the restraining member in a retracted position; and a power distribution control portion for controlling the power distribution of the electromagnet to detect at the detecting sensor The attraction is reduced or eliminated when it is detected that the portion of the moving object is present in the forbidden entry zone.

The rotation restricting portion may include: a biasing portion disposed between the supporting member and the restricting member, and biasing the restricting member in a retracting direction; a protruding portion including an electromagnet and a magnet And generating a repulsive force against the biasing action of the biasing portion to cause the restricting member to protrude from the supporting member side; and a power distribution control portion for controlling the power distribution of the electromagnet to detect the detecting The repulsive force is generated when the device detects that the portion of the moving object exists in the forbidden entry area.

The detection sensor can be an infrared sensor.

The base portion may have a fixed base and a rotating base, the fixed base is provided with a fence, the fence supports one side of the material to be treated, and the rotating base includes a A placement surface for the material to be treated is rotatably held by the fixed base, and the support member may be disposed to stand upright at the spin base.

The blade can be a circular saw blade that is rotatably held by the blade holding member.

The cutting machine can include: a stopping portion for causing one of the blades to drive the motor to stop when the detecting sensor detects that the portion of the moving object exists in the forbidden entry area.

Any combination of the above-described constituent elements and constituent elements obtained by transforming the expression of the method, system and other aspects of the present invention can also be effectively used as the aspect of the present invention.

According to the present invention, when a detecting sensor senses that a portion of a moving object exists in a forbidden entry area, the rotation of a blade holding member is restricted. Therefore, when a moving object, particularly a part of the human body, enters the forbidden entry area, it will reliably prevent the blade from approaching the moving object in the forbidden entry area. The present invention is particularly effective for a tabletop cutter having a blade that is rotatable relative to a base portion.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. The same or equivalent constituent elements, members, and the like shown in the drawings are denoted by the same reference numerals, and will not be repeatedly described below as appropriate. In addition, this embodiment is only an example, and is not intended to limit the invention, and all the features and combinations thereof described in this embodiment are not necessarily required by the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a left side view of a desktop cutter used as a cutting machine in accordance with an embodiment of the present invention. Figure 2 is a front elevational view of a desktop cutter. The desktop cutting machine comprises: a fixed base 1; a turntable 2 serving as a rotating base; a fence 3; a 5 for use as a supporting member; and a human body detecting infrared sensor 7 for use as A detecting sensor; a circular saw holding portion 13 serving as a blade holding member; and a circular saw blade 20 serving as a blade.

The fixed base 1 is a component that serves as a base that is placed on a work table. The turntable 2 is supported (embedded) in a central portion of the fixed base 1 so as to be rotatable in the horizontal direction. One of the upper surfaces of the turntable 2 is on the same plane as the upper surface of one of the fixed bases 1. As shown in FIGS. 9 and 10, a material to be treated 28 (for example, wood) is placed on the upper surfaces of the fixed base 1 and the turntable 2. The rotating shaft of the turntable 2 is perpendicular to its upper surface (placement surface). In this embodiment, the members on which the material 28 to be treated (the fixed base 1 and the turntable 2) are placed are collectively referred to as a "base portion".

The fence 3 is fixed to the upper surface of the fixed base 1 and supports one side of the material to be treated 28. The seat 5 is arranged to stand upright at one of the rear ends of the turntable 2 by a holder shaft 4. The height of the center of the shaft of the seat shaft 4 is configured to correspond, for example, approximately to the upper surface of the turntable 2. The seat 5 is pivotally supported so as to be tiltable leftward relative to the upper surface of the turntable 2 about the seat shaft 4 as a pivot point (which can be inclined toward the left side of FIG. 2).

Fig. 3 is a partially enlarged view as seen in the direction of arrow B shown in Fig. 1. As shown, an elongated hole 5a centered on the seat shaft 4 is formed in one of the backs of the seat 5. A clamping rod 6 is passed through the elongated hole 5a, and a threaded portion is formed at one end of the clamping rod 6 to be screwed into an internally threaded hole formed in the back surface of one of the turntables 2. When the clamping lever 6 is loosened, the seat 5 will surround the pivot hole 5a as a pivot point. The seat shaft 4 is inclined. When the clamping lever 6 is tightened, the seat 5 is clamped between the turntable 2 and the clamping lever 6 and fixed in an arbitrary tilting position. In the present embodiment, the long hole 5a is formed to have a range in which the seat 5 can be inclined to the left by 45 degrees. Alternatively, the elongated holes may be formed such that the seat 5 is tilted 45 degrees to the left and to the right.

As shown in FIGS. 1 and 2, the human body detecting infrared sensor 7 is disposed at a front portion of the seat 5. The human body detecting infrared sensor 7 is widely used in, for example, an automatic faucet that can be discharged without contacting a faucet and is generally used. The detection range 10 (corresponding to the forbidden entry area) of the human body detecting infrared sensor 7 is set to cover one of the forbidden entry portions 9 on the fixed base 1, and the prohibition of the entry portion 9 is prohibited by the prohibition shown in FIG. The entry mark 8 is shaded and shown. Thus, as shown in FIG. 11, the human body detecting infrared sensor 7 detects infrared rays emitted from a human body (for example, the hand 11) that has entered the detecting range 10, and outputs one of the following. Limit the signal.

Above the seat 5, the circular saw holder 13 is supported via a shaft 12 as a coupling shaft so as to be vertically rotatable relative to the upper surface of the base portion. A spring 14 (for example, a torsion coil spring) is disposed between the seat 5 and the circular saw retaining portion 13, and the spring 14 biases the circular saw retaining portion 13 upward.

Figure 5 is an enlarged view of a portion C of Figure 1. Fig. 6 is a cross-sectional view taken along line D-D shown in Fig. 5. The seat 5 holds the electromagnets 15a and 15b serving as the attracting portions, a pin 18 (for example, a metal pin) serving as a restricting member, and a spring 30 serving as a biasing portion in the vicinity of the portion engaged with the shaft 12. (for example, a compression coil spring). These components are one type of electromagnetic plunger and constitute a rotation limit. It should be noted that in the electromagnets 15a and 15b, only the magnetic core is shown and the coil is not shown. The electromagnets 15a and 15b are embedded in one of the housings 50 in the housing 5, so that their magnetic poles are mutually relatively. The spring 30 is housed between the electromagnets 15a and 15b. The accommodating space 50 is located near a rib 17 which is disposed on one of the gearboxes 16 of the seat 5. The pin 18 is attached to the electromagnet 15a. The axial direction of the pin 18 is parallel to, for example, the axial direction of the shaft 12. The pin 18 can protrude from the accommodating space 50 through a through hole. The spring 30 biases the electromagnets 15a and 15b in a separate direction (in other words, the pin 18 is biased in a protruding direction). In the state shown in Fig. 6, electric power is supplied to the electromagnets 15a and 15b, and the two electromagnets are attracted to each other against the biasing action of the spring 30. Therefore, the pin 18 does not protrude from the seat 5. On the contrary, when the power sources of the electromagnets 15a and 15b are turned off, as shown in Fig. 8, the electromagnets 15a and 15b are separated from each other by the biasing action of the spring 30, and the pin 18 protrudes from the accommodating space 50 to the outside and extends thereto. The circular saw holding portion 13 is rotated toward the base portion.

As shown in FIGS. 1 and 2, the circular saw retaining portion 13 includes a saw shaft 19, a gear box 16, a motor 22, a motor housing 23, and an operating grip 24. The gearbox 16 is integrated with a saw cover 21 for covering the upper half of one of the circular saw blades 20. A protective cover 31 for covering the lower half of one of the circular saw blades 20 is provided to be rotatable about the saw shaft 19, and the protective cover 31 is automatically accommodated in the saw cover 21 when the circular saw retaining portion 13 is rotated toward the base portion. In order to expose the circular saw blade 20. The motor 22 drives the circular saw blade 20 to rotate. The motor housing 23 houses and supports the motor 22. As shown in FIG. 2, the saw shaft 19 is disposed in the gear case 16 and extends in the horizontal direction. The circular saw blade 20 is attached to one end of the saw shaft 19 via a bolt 25. Although not shown in the drawings, the motor housing 23 includes a power transmitting mechanism (e.g., a gear) to transfer power from the motor 22 to the circular saw blade 20. Further, although similarly not shown in the drawings, the operation grip 24 includes a control device that controls the motor 22 and the electromagnets 15a and 15b based on signals transmitted from the human body detecting infrared sensor 7. Turn the power on/off (ON/OFF). The control device can be disposed in addition to the operating grip 24 One of the outer positions, in other words, may be disposed in the motor housing 23 or the seat 5.

As shown in FIG. 2, the two protrusions 5b are formed on one of the front faces of the seat 5. Further, the stopper bolts 26 and 27 are screwed in the right-angle direction in the rear portion of the upper surface of the turntable 2 to be positioned on the moving rail of the two projections 5b.

When the clamp lever 6 is loosened to tilt the seat 5, the projection 5b engages with one of the stopper bolt 26 or the stopper bolt 27 at a predetermined inclination angle to set an inclined position of the circular saw retaining portion 13. In the present embodiment, when the seat 5 is tilted to a position 45 degrees to the left, the stopper bolt 26 is engaged with the projection 5b. When the seat 5 is at the right angle position (0 degree), the stopper bolt 27 is engaged with the protruding portion 5b. In Fig. 2, the stopper bolt 27 is engaged with the head of the projection 5b. In other words, the seat 5 is located at a right angle position (0 degrees).

On the upper surface of the turntable 2, as is known, a blade opening plate (not shown) is fixed, which has a groove portion at the center thereof for the circular saw blade 20 to enter. When the lower end of the circular saw blade 20 is moved downward in the cutting to a position lower than the upper surface of the turntable 2, the blade enters the groove portion of the blade opening plate to prevent abrasion of one of the finished surfaces of the material to be treated 28.

Next, the operation of the desktop cutter constructed in the above manner will be explained.

An operator places the material to be treated 28 on the upper surface of the fixed base 1 and the turntable 2, and pulls a switch 29 provided on the operating grip 24 to turn on the power of the desktop cutter. Subsequently, the drive motor 22 rotates and the circular saw blade 20 begins to rotate by the saw shaft 19. The operator holds the operation grip 24 to rotate the circular saw holding portion 13 toward the upper surface of the fixed base 1 and the turntable 2, thereby cutting the material to be processed by the circular saw blade 20. 28.

When a human body (for example, the hand 11) enters the prohibition entry portion 9 as shown in FIG. 11 in the energized state of the desktop cutter (when the hand 11 or the like enters the detection range 10), it is set in the seat 5 The human body detecting infrared sensor 7 on the front side detects the infrared rays emitted from the hand 11 or the like and outputs a limit signal. As a result, the power sources of the electromagnets 15a and 15b embedded in the seat 5 are cut off, and the electromagnets 15a and 15b are separated from each other as shown in FIG. When the electromagnets 15a and 15b are separated from each other, the pin 18 attached to the electromagnet 15a protrudes in a direction parallel to the shaft 12 by the bias of the spring 30, and abuts against the rib 17 provided on the gear case 16. Upper, in turn, restricts the circular saw holding portion 13 from rotating downward. In other words, the rotation of the circular saw holding portion 13 toward the base portion side does not exceed the state shown in FIG. Further, the power of the motor 22 is turned off and its rotation is stopped.

When the hand 11 or the like leaves the detection range 10, the human body detecting infrared sensor 7 stops outputting the limit signal. Subsequently, the power supply of the electromagnets 15a and 15b is also restored, and the electromagnets 15a and 15b are attracted to each other as shown in FIG. When the electromagnets 15a and 15b are attracted to each other, the pin 18 attached to the electromagnet 15a is retracted in a direction parallel to the shaft 12 against the biasing action of the spring 30. In addition, the power supply of the motor 22 is restored and the rotation is started again. Thereby, the rotation restriction on the circular saw holding portion 13 is canceled, the motor 22 is rotated again, and the operation can be resumed.

Figure 12 is a functional block diagram of the desktop cutting machine of the present embodiment. A power supply unit 101 is, for example, a connection portion connected to a commercial power source, and performs an alternating current/direct current (AC/DC) conversion in the case of direct current driving. The switch 29 is an operation switch that is turned on/off by an operator and is connected in series with the motor 22. A switching element 29' is an example A Field Effect Transistor (FET) is constructed and connected in series with the motor 22. When the power supply unit 101 is connected to a commercial power source or the like, a driving voltage is supplied to a limit switch unit 102 (control device) and a human body detecting infrared sensor 7, and a driving voltage is supplied from the limit switch unit 102 to Electromagnets 15a and 15b. Further, the self-limiting switch unit 102 outputs a control signal B to cause the switching element 29' to be in an on state.

In the normal state, the limit switch unit 102 supplies the voltage from the power supply unit 101 to the electromagnets 15a and 15b, and outputs a communication number B to the switching element 29'. When the operator operates (turns on) the switch 29 in this state, power from the power supply unit 101 is supplied to the motor 22 via the switch 29 and the switching element 29', and the motor 22 is driven.

On the contrary, when the limit switch unit 102 receives the limit signal output from the human body detecting infrared sensor 7, it outputs a disconnection signal B to the switch 29' to cut off the voltage supply to the motor 22 and the electromagnet. Voltage supply for 15a and 15b (signal A).

The configuration shown in FIG. 13 can be used instead of the configuration shown in FIG. 12 as a functional block. When the power supply unit 101 is connected to a commercial power source or the like, a driving voltage is supplied to the human body detecting infrared sensor 7 via the switch 29, and a driving voltage is passed through the switch 29 and a limiting switch portion serving as a power distribution control portion. 102 is supplied to the motor 22 and the electromagnets 15a and 15b. In the normal state, the limit switch unit 102 supplies the voltage from the switch 29 to the motor 22 and the electromagnets 15a and 15b. Conversely, when it receives the limit signal from the human body detecting infrared sensor 7, it will cut off the pair. The voltage of the motor 22 and the electromagnets 15a and 15b is supplied.

In the desktop cutting machine of the embodiment, a human body detecting infrared sensor is disposed 7. It is used to detect whether a part of a human body (for example, a hand) exists in a preset detection range 10 (no entry area), and when the human body detecting infrared sensor 7 detects the detection area When the human body portion is present in 10, the rotation of the circular saw holding portion 13 with respect to the base portion is restricted. Therefore, even if a moving object, particularly a part of the human body, enters the forbidden entry area, the blade can be reliably prevented from approaching the moving object in the forbidden entry area. In addition to limiting the rotation, the motor is also stopped in combination (stopping the rotation of the circular saw blade).

The operation of the limit switch portion 102 (control device) will be explained below with reference to the flowchart of Fig. 14. When the power supply unit 101 is connected to the commercial power source and supplies the driving voltage to the limit switch unit 102 (which includes a microcomputer as a control unit), a human body detection process (S1) is started.

The limit switch unit 102 outputs a communication number to the switching element (field effect transistor) 29' to bring the motor 22 into a drivable state (S2), and starts supplying power to the electromagnets 15a and 15b (S3). Subsequently, the limit switch unit 102 (microcomputer) monitors a detection signal from the human body detecting infrared sensor 7 (S4). In the present embodiment, the infrared sensor 7 is described as a thermal sensor. As shown in FIG. 15, it is known that after the infrared sensor 7 detects a human body, the output voltage from the sensor rises immediately. This increase will become larger as the temperature becomes higher. Since the temperature of the human body is higher than the temperature of the material to be treated 28, when the infrared sensor 7 detects a human body, the output voltage of the infrared sensor 7 is significantly increased. Since the output voltage reaches a steady state after a predetermined time elapses after the detection, the limit control is executed immediately after the output voltage exceeds a threshold as described below. In addition, after reaching a steady state, when the human body moves and leaves the detection range, the output voltage also changes. In this case, however, the voltage is changed to decrease with respect to a reference voltage.

As shown in FIG. 16, the limit switch unit 102 is provided with an amplifying portion 102a (for example, an operational amplifier) for amplifying the detected voltage signal, and a comparator portion 102b for comparing the amplified signal and threshold. And a storage unit 102c for storing a preset threshold. The comparator portion 102b and the storage portion 102c may be configured to be included in a microcomputer or may be constituted by analog components (resistors or the like).

The detection signal outputted from the human body detecting infrared sensor 7 is amplified by the amplifying portion 102a in the limiting switch portion 102, and converted into a digital signal, which is then input to the microcomputer (comparator portion 102b) and is coupled thereto. The threshold values previously stored in the storage unit 102c are compared (S5). As a threshold, for example, a relationship between a plurality of external air temperatures, a temperature of the material to be treated 28 according to the outside air temperature, and a human body temperature may be stored in a matrix form.

If the detection signal is less than the threshold (the answer is "NO" in S5), the power sources of the electromagnets 15a and 15b are maintained (S6). When the switch 29 is turned on, the motor 22 can be driven, and the circular saw holding portion 13 can be rotated to the side of the base portion.

On the contrary, if the detection signal is greater than the threshold (YES in S5), the limit switch unit 102 outputs a cut signal to the electromagnets 15a and 15b (S7) to cut off the power of the electromagnets 15a and 15b. And a cut signal (disconnect signal) is output to the switching element 29' (S8). As a result, since the pin 18 protrudes from the accommodating space 50 and abuts against the rib 17, the circular saw retaining portion 13 can be restricted from rotating downward. Further, since the switching element 29' is turned off, the power of the motor 22 is cut off and the motor 22 is stopped. Braking can be applied to the motor 22 by controlling the switching element 29' instead of opening the switching element 29'.

Subsequently, it is judged whether or not the hand 11 leaves the detection area 10 (S9). If the hand 11 enters the detection area 10, the output of the infrared sensor 7 changes substantially in a positive direction with respect to a reference voltage. Conversely, if the hand 11 leaves the detection area 10, the output voltage in a stable state is greatly increased in a negative direction. change. If the detected voltage at this point becomes less than the threshold of the negative side (the answer is "YES" in S9), it is determined that the hand 11 is outside the detection area 10, and the process returns to S2. However, if the switch 29 is in the ON state, the circular saw blade 20 may suddenly rotate and damage the material 28 to be processed. Therefore, it is preferable to check "Yes" in S9 and return to S2 to check whether the state of the switch 29 is It is disconnected, and if switch 29 is on, it waits until it is turned off.

On the contrary, if the answer is "NO" in S9, it is judged whether or not the switch 29 has been turned off (S10). If it has been disconnected (the answer is "Yes" in S10), the process returns to S2. If it is still turned on (the answer is "NO" in S10), the judgment of S9 is repeated.

The present invention has been described above by way of examples. It will be understood by those skilled in the art that various modifications may be made to the various components and processes of the embodiments within the scope of the claims. In the following, examples of each retouching will be presented.

The cutting machine is not limited to being placed on a workbench.

Instead of any of the electromagnets 15a and 15b, a permanent magnet or a soft magnet (for example, iron) may be used.

When the limit signal is output, instead of turning off the power sources of the electromagnets 15a and 15b, the voltage supplied to the electromagnets 15a and 15b can be reduced, and the mutual attraction force becomes weaker than the biasing force of the spring 30.

The spring 30 can be, for example, an extension coil spring, the stretching The coil spring biases the electromagnets 15a and 15b in the suction direction (the pin 18 is biased in the retracting direction). In this case, when the limit signal is output, the electromagnets 15a and 15b function as a projection instead of a suction portion. In other words, for example, in the normal state, the electromagnets 15a and 15b are not distributed, and the two electromagnets are attracted to each other by the biasing action of the spring 30 (the pin 18 is in a retracted position). On the contrary, when the human body detecting infrared sensor 7 outputs the limit signal, the electromagnets 15a and 15b are distributed, and the repulsive force (repulsion force) interacts therebetween, and the two electromagnets are separated from each other against the biasing action of the spring 30. (Pin 18 is prominent).

Instead of the configuration in which the pin 18 can abut against one of the edges of the rib 17 provided on the gearbox 16 when the limit signal is output, or in addition to the configuration, the pin 18 can be configured to enter the gearbox when the limit signal is output One of the upper 16 limits the hole. Figure 17 is an enlarged view of an embodiment of the retouching of Figure 5, wherein the two limiting holes 161 and 162 are disposed on the gear case 16. In the example shown in this figure, when the circular saw retaining portion 13 is not rotated, the restricting hole portion 161 is located at the same position as the pin 18 in a side view. When the circular saw retaining portion 13 is rotated by a predetermined angle toward the base portion side, the restricting hole portion 162 is located at the same position as the pin 18 in a side view. When the two restriction holes are provided in this manner, the rotation restriction can be performed even when the human body detecting infrared sensor 7 outputs the limit signal during the rotation of the circular saw holding portion 13. The two restricting holes may be through holes or bottomed holes, and the number thereof is not particularly limited.

A plurality of rotation restricting members (electromagnets 15a and 15b, spring 30, and pin 18) may be disposed to be positioned at different rotation restricting positions. Also in this case, as in the case where two or more restriction holes are provided, even when the human body detecting infrared sensor 7 emits a limit signal during the rotation of the circular saw holding portion 13, it can be performed. Rotation limit.

The pin 18 can be configured to abut one side of the rib 17 to reduce the rotational speed of the circular saw retaining portion 13 (interfering with downward rotation) by the friction of the pin 18. In this case, one end portion of the pin 18 is preferably made of an elastic material (for example, rubber). Reducing the speed of the circular saw holding portion 13 is also included in the concept of rotation limitation.

The detection sensor is not limited to only one infrared sensor, but may be constituted by, for example, an imaging device (for example, a camera) and an image processing device.

1‧‧‧Fixed base

2‧‧‧ Turntable

3‧‧‧ fence

4‧‧‧ seat shaft

5‧‧‧

5a‧‧‧ long hole

5b‧‧‧Protruding

6‧‧‧Clamping rod

7‧‧‧Human detection infrared sensor

8‧‧‧No entry mark

9‧‧‧No entry section

10‧‧‧Detection range

11‧‧‧Hand

12‧‧‧Axis

13‧‧‧Circular saw retaining unit

14‧‧‧ Spring

15a‧‧‧Electromagnet

15b‧‧‧electromagnet

16‧‧‧ Gearbox

17‧‧‧ rib

18‧‧ ‧ sales

19‧‧‧ saw shaft

20‧‧‧Circular saw blade

21‧‧‧ saw cover

22‧‧‧Electric motor

23‧‧‧ motor housing

24‧‧‧Operation grip

25‧‧‧ bolt

26‧‧‧stop bolt

27‧‧‧stop bolt

28‧‧‧Materials to be processed

29‧‧‧Switch

29'‧‧‧Switching elements

30‧‧‧ Spring

31‧‧‧ protective cover

50‧‧‧ accommodation space

101‧‧‧Power Department

102‧‧‧Restriction switch

102a‧‧Amplification

102b‧‧‧ Comparator

102c‧‧‧Storage Department

161‧‧‧Restricted Holes

162‧‧‧Restricted Holes

1 is a left side view of a desktop cutter according to an embodiment of the present invention; FIG. 2 is a front view of the desktop cutter; FIG. 3 is viewed in the direction of arrow B shown in FIG. Figure 4 is a partial enlarged view of the direction of arrow A shown in Figure 1; Figure 5 is an enlarged view of a portion C of Figure 1 in a normal state; Figure 6 is along Figure 5 A partial cross-sectional view taken along the line DD shown; FIG. 7 is an enlarged view of the portion C shown in FIG. 1 in a rotationally restricted state; and FIG. 8 is a partial cross-sectional view taken along line EE shown in FIG. Figure 9 is a left side view showing a state in which a material to be processed is placed on a base shown in Figure 1; Figure 10 is a front view of the state shown in Figure 9; Figure 11 is an arrow shown in Figure 9. a partially enlarged view of the direction of F; Figure 12 is a functional block diagram of the desktop cutting machine of the embodiment; Figure 13 is a functional block diagram of the desktop cutting machine of this embodiment (another example); Figure 14 is a limiting switch portion (control device) FIG. 15 is an output characteristic diagram of an infrared sensor; FIG. 16 is a functional block diagram exemplarily showing a limit switch portion; and FIG. 17 is an enlarged view of a retouching example of FIG. Two of the limiting holes are disposed on a gear box.

1‧‧‧Fixed base

2‧‧‧ Turntable

3‧‧‧ fence

4‧‧‧ seat shaft

5‧‧‧

6‧‧‧Clamping rod

7‧‧‧Human detection infrared sensor

10‧‧‧Detection range

12‧‧‧Axis

13‧‧‧Circular saw retaining unit

14‧‧‧ Spring

16‧‧‧ Gearbox

18‧‧ ‧ sales

20‧‧‧Circular saw blade

21‧‧‧ saw cover

22‧‧‧Electric motor

23‧‧‧ motor housing

24‧‧‧Operation grip

25‧‧‧ bolt

29‧‧‧Switch

31‧‧‧ protective cover

Claims (10)

A cutting machine comprising: a support member disposed on a base portion for supporting a material to be treated; a blade holding member rotatably supported by the support member; and a blade Holding the blade holding member, the cutting machine further comprises: a detecting sensor for detecting whether a part of a moving object exists in one of the prohibited entry areas set on the base portion; and a rotation restricting portion, And limiting the rotation of the blade holding member toward the base portion when the detecting sensor detects the presence of the portion of the moving object in the forbidden entry area. The cutting machine of claim 1, wherein the rotation restricting portion has a restricting member, and when the detecting sensor detects that the portion of the moving object exists in the forbidden entry region, the restricting member protrudes to A path in which the blade holding member is rotated toward the base portion. A cutting machine according to claim 2, wherein at least one restriction portion is provided on the blade holding member, and the at least one restriction portion is latchable with the restriction member. A cutting machine according to claim 2, wherein at least one restriction hole portion is provided on the blade holding member, and the restriction member is insertable into the at least one restriction hole portion. The cutting machine of any of claims 2 to 4, wherein the rotation limiting portion comprises: An offset portion is disposed between the support member and the restricting member, and biases the restricting member along a protruding direction; a attracting portion includes an electromagnet and resists the bias by an attractive force generated by a magnet a biasing mechanism for holding the limiting member in a retracted position; and a power distribution control portion for controlling power distribution of the electromagnet to detect the prohibited entry area in the detecting sensor When the portion of the moving object is present, the attraction is reduced or eliminated. The cutting machine according to any one of claims 2 to 4, wherein the rotation restricting portion includes: a biasing portion disposed between the supporting member and the restricting member, and biasing the limit in a retracting direction a protruding portion comprising an electromagnet and projecting the restricting member from the supporting member side by a repulsive force generated by a magnet against a biasing action of the biasing portion; and a power distribution control portion The power distribution of the electromagnet is controlled to generate the repulsive force when the detecting sensor detects that the portion of the moving object exists in the forbidden entry area. The cutting machine of any one of claims 1 to 6, wherein the detecting sensor is an infrared sensor. The cutting machine according to any one of claims 1 to 7, wherein the base portion has a fixed base and a rotating base, the fixed base is provided with a fence supporting one side of the material to be treated The spin base includes a placement surface for the material to be treated and is rotatably held by the fixed base, and The support member is disposed to stand upright at the spin base. A cutting machine according to any one of claims 1 to 8, wherein the blade is a circular saw blade rotatably held by the blade holding member. The cutting machine of claim 9, further comprising: a stopping portion, configured to drive one of the blades when the detecting sensor detects that the portion of the moving object exists in the forbidden entry area The motor stops.