JP2020037224A - Workpiece cutting device and safety device for workpiece cutting device - Google Patents

Abstract

To provide a workpiece cutting device in which, when a body part is caught with a workpiece pressing member, a cutting blade is automatically stopped being driven without requiring operation of an operator, and furthermore the part for detecting catching of the body part such as a finger, etc. has excellent durability, and stability of detecting the body part such as a finger, etc. is excellent, too.SOLUTION: A workpiece cutting device 10 comprises a workpiece support member 11, a workpiece pressing member 12, a cutting blade 14a and cutting blade driving means 14b, and further is provided with: electrostatic capacitance detection means 16a for detecting a value (electrostatic capacitance related value) related to electrostatic capacitance between a workpiece support surface of the workpiece support member 11 and a workpiece pressing surface of the workpiece pressing member 12; and safety control means 16b which, when the electrostatic capacitance related value detected by the electrostatic capacitance detection means 16a is out of a prescribed range, outputs a cutting blade undrivable signal, which makes the cutting blade driving means 14b undrivable, to the cutting blade driving means 14b.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a work cutting device such as a panel saw, and a safety device for a work cutting device that can be attached to a work cutting device and used to ensure the safety of the work cutting device.

  2. Description of the Related Art As a work cutting device for cutting a work, various devices are known according to the type of the work and the like.

  For example, FIGS. 4 to 7 and the like of Patent Document 1 disclose a panel saw including a receiving plate 2, a circular saw cover 13, and a circular saw 11 as a work cutting device for cutting a panel-shaped work. . In the panel saw of Patent Document 1, a plate 23 (work) to be cut is arranged in a gap between the front surface of the receiving plate 2 and the rear surface of the circular saw cover 13, and the plate material 23 is pressed against the receiving plate 2 by the circular saw cover 13. Then, by moving the circular saw 11 in the vertical direction while rotating, the plate material 23 is cut in the vertical direction. In this manner, by cutting the plate 23 while pressing it against the receiving plate 2 with the circular saw cover 13, the plate 23 at the time of cutting is less likely to rattle, and the plate 23 can be cut neatly. I have.

  In this type of panel saw, as shown in FIG. 1 and the like of Patent Document 1, the circular saw 11 is disposed on the rear side of the receiving plate 2. A slit 3 for projecting to the front side of 2 is provided in a vertical direction. The receiving plate 2 may be called by a name such as “platen”, and the circular saw cover 13 may be called by a name such as “clamp”. In the present specification, the “surface plate” may be conceptualized as a higher-level concept and referred to as a “work support member”, and the “clamp” may be conceptualized as a higher-level concept and referred to as a “work pressing member”. "Circular saw" is sometimes referred to as a "cutting blade" with a higher concept.

  However, in a work cutting apparatus of a type in which a plate material 23 (work) is cut while being pressed against a receiving plate 2 (work supporting member) by a circular saw cover 13 (work pressing member), like a panel saw of Patent Document 1. When the work is pressed by the work pressing member, the worker's body (fingers, etc.) may be caught in the gap between the work pressing member and the work or in the gap between the work pressing member and the work supporting member. If the cutting blade is driven in a state where a finger or the like is sandwiched in the gap, a serious accident such as cutting of the finger or the like may be caused. For this reason, a work cutting device such as a panel saw generally adopts a measure to provide an emergency stop button for emergency stop of the driving of the cutting blade.

  However, an operator who has fingers or the like sandwiched between the work pressing members is not always calm and can always press the emergency stop button because he / she is in a hurry. In the first place, the emergency stop button may not be accessible depending on the posture of the worker or the body part sandwiched between the work pressing members. Further, even if a worker whose finger or the like is pinched by the work pressing member can operate the emergency stop button, a time lag will inevitably occur after the finger or the like is pinched until the operator operates the emergency stop button. For this reason, when a finger or the like is caught in a state where the cutting blade is nearby, there is a high risk that the emergency stop of the cutting blade cannot be made in time by the time lag that occurs until the emergency stop button is operated.

  In view of such a situation, as shown in FIG. 4 of Patent Document 2, a body part such as a finger is provided on a work pressing surface side of a work pressing member (a pressing member 23 in FIG. 4). A workpiece cutting device provided with a pinch detecting means (detection switch 31 in FIG. 1) for detecting that the sheet has been pinched has also been proposed. Thus, when a finger or the like is caught in the work pressing member, the cutting blade can be set in a state in which the cutting blade is not driven without requiring an operation of an operator. In addition, the above-described time lag can be reduced.

  However, contact-type entrapment detection means such as the detection switch 3 in the work cutting device of Patent Document 2 often has a problem in durability. In addition, in the case where there is unevenness in a part of the work pressed by the work pressing member, the detection switch reacts and the cutting blade does not operate even though a body part such as a finger is not pinched. Depending on the form of the work, the possibility that the cutting blade may be driven without responding to the detection switch even though the body part such as the finger is pinched, It is difficult to ensure the stability of the detection of the body part.

JP-A-09-314501 JP-A-03-128204

  The present invention has been made to solve the above-described problem, and when a body part is sandwiched by a work pressing member, a state is set in which a cutting blade is not automatically driven without requiring an operation of an operator. It is another object of the present invention to provide a workpiece cutting device which is excellent not only in durability of a portion for detecting a pinching of a body part such as a finger, but also in stability of detection of a body part such as a finger. It is another object of the present invention to provide a safety device for a work cutting device that can be used by attaching to the work cutting device in order to secure the safety of the work cutting device.

The above issues are
A work supporting member for supporting the work from one side,
A work pressing member for pressing the work supported by the work support member from the other side,
A cutting blade for cutting the vicinity of a portion of the work pressed by the work pressing member,
A workpiece cutting device including a cutting blade driving unit for driving the cutting blade,
Capacitance detecting means for detecting a value related to the capacitance between the work supporting surface of the work supporting member and the work pressing surface of the work pressing member (hereinafter referred to as “capacitance related value”); ,
When the capacitance-related value detected by the capacitance detecting unit is out of a predetermined range, a safety control unit that outputs to the cutting blade driving unit a cutting blade driving disable signal that disables driving of the cutting blade driving unit. The problem is solved by providing a workpiece cutting device further provided.

  In the work cutting device of the present invention, based on the capacitance-related value between the work supporting surface of the work supporting member and the work pressing surface of the work pressing member, a body part such as a finger is pinched by the work pressing member. When it is determined that a body part such as a finger is pinched by the work pressing member, the cutting blade is not automatically driven, and as a trigger for the cutting blade not to be driven, No operator operation is required. For this reason, even when the worker whose body part such as a finger is sandwiched by the work pressing member is in a hurry, the cutting blade is not driven. Therefore, the workpiece cutting device of the present invention is more excellent in safety.

  Further, the work cutting device of the present invention detects the pinching of the body part by the work pressing member not by a contact type mechanism but by a non-contact type mechanism (capacitance detecting means). For this reason, the workpiece cutting device of the present invention is excellent in the durability of the portion for detecting the pinching of the body part by the workpiece pressing member. In addition, the work cutting device of the present invention can stably detect the pinching of a body part by the work pressing member, even when the part of the work pressed by the work pressing member has irregularities. It has become.

  In the workpiece cutting device of the present invention, the detecting unit of the capacitance detecting unit is capable of detecting a capacitance-related value between the work supporting surface of the work supporting member and the work pressing surface of the work pressing member, There is no particular limitation. However, it is preferable that the detecting section of the capacitance detecting means be a conductive hard rubber or a hard elastomer provided on the work pressing surface side of the work pressing member. As a result, vibrations that may occur in the work when the work is cut by the cutting blade are absorbed by the detection unit of the capacitance detection unit, and not only are the rattles of the work suppressed, but also the electrostatic force generated when the work is pressed by the work pressing member. It is also possible to prevent the work from biting into the detecting section of the capacity detecting means.

  In the work cutting device of the present invention, after the work pressing member starts the operation of pressing the work against the work supporting member, the capacitance detection is performed before the cutting blade driving unit drives the cutting blade. Means for detecting the capacitance-related value by means and output of the cutting blade drive disable signal by the safety control means (only when the capacitance-related value detected by the capacitance detection means is out of the predetermined range). Is also preferably performed. As described above, by detecting the pinching of the body part at a timing before the cutting blade is driven, it is possible to further enhance the safety of the work cutting device.

In addition, the above problems
A work supporting member for supporting the work from one side,
A work pressing member for pressing the work supported by the work support member from the other side,
A cutting blade for cutting the vicinity of a portion of the work pressed by the work pressing member,
Attached to a work cutting device having a cutting blade driving means for driving the cutting blade,
A safety device for a work cutting device that prevents a cutting blade from being driven when a body part is sandwiched in a work pressing member,
Capacitance detecting means for detecting a value related to the capacitance between the work supporting surface of the work supporting member and the work pressing surface of the work pressing member (hereinafter referred to as “capacitance related value”); ,
When the capacitance-related value detected by the capacitance detecting unit is out of a predetermined range, a safety control unit that outputs to the cutting blade driving unit a cutting blade driving disable signal that disables driving of the cutting blade driving unit. The problem is also solved by providing a safety device for a work cutting device, which is provided with the safety device.

  This safety device for a work cutting device can be suitably used in the above-described work cutting device of the present invention.

  As described above, according to the present invention, when the body part is sandwiched between the work pressing members, not only the cutting blade is not automatically driven without the need of an operator's operation but also the body part such as a finger. It is possible to provide a workpiece cutting device that is excellent in the durability of a part for detecting the entrapment of a workpiece and is also excellent in the stability of detecting a body part such as a finger. Further, it is possible to provide a safety device for a work cutting device that can be used by attaching to the work cutting device in order to secure the safety of the work cutting device.

FIG. 4 is a perspective view showing a panel saw (work cutting device) employing the configuration according to the present invention, showing a state before a work is pressed against a work supporting member by a work pressing member. FIG. 3 is a diagram showing a panel saw (work cutting device) employing the configuration according to the present invention, in which a work is pressed against a work supporting member by a work pressing member, and a cutting blade is driven to cut the work. It is the perspective view shown. It is sectional drawing which cut | disconnected the panel saw (work cutting apparatus) which employ | adopted the structure which concerns on this invention on the horizontal surface, (a) The state before arrange | positioning a work in the clearance gap between a work support member and a work pressing member, (b) FIGS. 4A and 4B are diagrams respectively illustrating a state in which the work is arranged in a gap between the work supporting member and the work pressing member, and a state in which the work pressed against the work supporting member by the work pressing member is cut by the cutting blade. It is. It is sectional drawing which cut | disconnected the panel saw (work cutting apparatus) which employ | adopted the structure which concerns on this invention on the horizontal surface, and was the figure which showed the state with fingers pinched between the workpiece | work and the workpiece pressing member. FIG. 2 is a circuit diagram showing an outline of an electric circuit of a safety device in a panel saw (work cutting device) employing a configuration according to the present invention. FIG. 4 is a flowchart illustrating an example of a process executed by a safety control unit in a panel saw (work cutting device) employing a configuration according to the present invention.

  Preferred embodiments of the workpiece cutting device of the present invention will be described more specifically with reference to the drawings. Hereinafter, the work cutting device of the present invention will be described by taking a panel saw as an example. However, this is only for the convenience of description, and the technical scope of the work cutting device of the present invention includes a work cutting device other than the panel saw.

  FIG. 1 is a diagram showing a panel saw 10 employing a configuration according to the present invention, and is a perspective view showing a state before a work 20 is pressed against a surface plate 11 by a clamp 12. FIG. 2 is a diagram showing the panel saw 10 employing the configuration according to the present invention, in which the work 20 is pressed against the platen 11 by the clamp 12 and the circular saw 14a is driven to cut the work 20. It is the perspective view which showed the state. FIG. 3 is a cross-sectional view of the panel saw 10 employing the configuration according to the present invention, cut along a horizontal plane, and (a) a state before the work 20 is arranged in a gap between the surface plate 11 and the clamp 12; 2) a state in which the work 20 is arranged in a gap between the surface plate 11 and the clamp 12; and (c) a state in which the work 20 pressed against the surface plate 11 by the clamp 12 is cut by the circular saw 14a. FIG.

  As shown in FIGS. 1 and 2, the panel saw 10 of the present embodiment includes a surface plate 11, a clamp 12, a clamp support member 13, a work cutting unit 14, an operation box 15, and a safety device 16. It has become.

  As shown in FIG. 1, the surface plate 11 is a plate-shaped member for supporting the panel-shaped work 20 from the rear side (the positive side in the y-axis direction). The surface plate 11 is provided as the “work support member”. The platen 11 usually has a plate shape. The platen 11 may be arranged to be perpendicular to the horizontal plane, but in the panel saw 10 of the present embodiment, the upper edge (edge on the positive side in the z-axis direction) of the platen 11 is the lower edge. The platen 11 is arranged in an inclined state so as to be located behind (a positive edge in the y-axis direction) a portion (an edge portion on the negative side in the z-axis direction). Thereby, the work 20 can be supported in a state of being placed on the front surface of the surface plate 11, instead of leaning the work 20 on the front surface side of the surface plate 11. In a work cutting device other than the panel saw 10 (for example, a running saw), the surface plate 11 may be provided in a state of being laid horizontally.

  The clamp 12 is a member that presses the vicinity of a cutting target portion of the work 20 supported on the surface plate 11 from the front side. The clamp 12 is provided as the above-mentioned "work pressing member". The clamp 12 makes it possible to prevent the work 20 from rattling during cutting. In the panel saw 10 of the present embodiment, the clamp 12 can be moved in the front-rear direction (y-axis direction) with respect to the clamp support member 13 disposed on the front side of the clamp 12 via a parallel link mechanism or the like (not shown). It is in a state of being supported in a proper state. Similarly to the clamp 12, the clamp support member 13 is also a long member extending from near the lower edge of the surface plate 11 to near the upper edge. When the clamp 12 is moved rearward toward the surface plate 11 in a state where the work 20 is arranged in the gap between the clamp 12 and the surface plate 11, the work 20 is pressed against the surface plate 11 by the clamp 12. Becomes

  The arrangement and form of the clamp 12 are not particularly limited as long as the clamp 12 can press the vicinity of the cut target portion on the work 20 toward the surface plate 11. In the panel saw 10 of the present embodiment, the clamp 12 is disposed near a middle portion of the surface plate 11 in the left-right direction (x-axis direction), and extends from near the lower edge portion of the surface plate 11 to near the upper edge portion. It is a member of the shape. In the panel saw 10 of the present embodiment, as shown in FIG. 3, the clamp 12 has a concave groove on the rear surface side (the positive side in the y-axis direction). The concave groove is provided continuously along the longitudinal direction of the clamp 12. The concave groove of the clamp 12 is a part for accommodating a circular saw 14a (cutting blade) for cutting the work 20, as shown in FIG. Further, by cutting the work 20 with the circular saw 14a housed inside the concave groove, not only is it possible to prevent chips from scattering on the front side of the panel saw 10, but also to suppress noise during cutting. It is possible.

  The work cutting means 14 is for cutting the work 20, and includes a circular saw 14a (tip saw) and a circular saw drive motor 14b. As shown in FIG. 1, the rotating shaft 14c of the circular saw 14a is supported by a bearing 14d, and one end thereof is connected to a first pulley 14e. On the other hand, one end of the output shaft 14f of the circular saw drive motor 14b is connected to the second pulley 14g. A common V-belt 14h is wound around the first pulley 14e and the second pulley 14g. Thus, the rotational force of the circular saw drive motor 14b is transmitted to the circular saw 14a.

  The circular saw 14 a is provided as the above-mentioned “cutting blade”, and is for cutting the vicinity of a portion of the work 20 pressed by the work pressing member 12. On the other hand, the circular saw drive motor 14b is provided as the above-mentioned "cutting blade driving means", and serves to rotationally drive (drive) the circular saw 14a (cutting blade). The work cutting means 14 is arranged on the rear side of the surface plate 11, and can be moved in the front-back direction (y-axis direction) and the up-down direction (z-axis direction) by a moving mechanism (not shown). ing.

  That is, when the work 20 is not to be cut, the circular saw 14a moves the circular saw 14a to the rear side (the positive side in the y-axis direction) of the surface plate 11 as shown in FIGS. However, when the work 20 is to be cut, a part of the circular saw 14a is fixed through a slit 11a provided on the platen 11, as shown in FIG. The board 11 is moved forward to a position protruding toward the front side (negative side in the y-axis direction) of the board 11. In the state shown in FIG. 3 (c), when the work cutting means 14 is moved vertically (normally, descending from the upper side to the lower side) while the circular saw 14a is rotationally driven, the work 20 is cut in the vertical direction. You.

  The operation box 15 is provided with various operation units (push buttons, switches, dials, levers, and the like) for starting and stopping the panel saw 10. The operation of moving the clamp 12, the operation of driving the cutting blade 14a described later, the emergency stop operation of the panel saw 10, and the like are also performed by operating the operation unit provided in the operation box 15. However, the operation of moving the clamp 12 and the like may be performed by a portion other than the operation box 15 such as a foot pedal (not shown) installed on the floor. The operation box 15 may be provided with not only an operation unit but also a display unit (a light-emitting lamp, a liquid crystal panel, a meter, and the like) for displaying a state of the panel saw 10. The place where the operation box 15 is provided is not particularly limited, but is usually near the clamp support member 13 in consideration of the convenience of operation. In the panel saw 10 of the present embodiment, the operation box 15 is attached to a lower portion on the front surface of the clamp support member 13.

  The safety device 16 is for preventing the circular saw 14a from being driven when a body part such as a finger is pinched by the clamp 12. The safety device 16 is provided as the “safety device for a work cutting device”. That is, since the panel saw 10 according to the present embodiment cuts the work 20 while sandwiching the work 20 between the surface plate 11 and the clamp 12 as described above, when the clamp 12 is moved to the surface plate 11 side, As shown in FIG. 4, a body part such as a finger 30 may be pinched by the clamp 12. FIG. 4 is a cross-sectional view of the panel saw 10 adopting the configuration according to the present invention, cut along a horizontal plane, showing a state in which a finger 30 is sandwiched between the work 20 and the clamp 12.

  In the state shown in FIG. 4, if the circular saw 14a moves forward (to the negative side in the y-axis direction) and descends along the slit 11a while being driven to rotate, a serious accident such as cutting of the finger 30 may occur. In the panel saw 10 of this embodiment, as described above, the emergency stop button is provided on the operation box 15 (FIG. 1), but an operator who has pinched a body part such as the finger 30 with the clamp 12 is not required. In such a case, there is a possibility that the emergency stop button of the operation box 15 cannot be calmly operated by being panicked. Further, depending on the posture at that time, the emergency stop button may not be reachable. In this regard, the safety device 16 ensures the safety of the worker by automatically disabling the circular saw 14a when the body part such as the finger 30 is pinched by the clamp 12. ing. As shown in FIGS. 1 and 2, the safety device 16 includes a capacitance detection unit 16a and a safety control unit 16b.

  The capacitance detecting means 16 a is for detecting a capacitance-related value between a front surface (work supporting surface) of the surface plate 11 and a rear surface (work pressing surface) of the clamp 12. The capacitance-related value detected by the capacitance detecting means 16a is the capacitance between the work supporting surface of the surface plate 11 and the work pressing surface of the clamp 12 (if the surface plate 11 and the clamp 12 are regarded as electrodes, , The platen 11 and the clamp 12 can be handled as pseudo capacitors, and a pseudo capacitor in which the platen 11 and the clamp 12 are regarded as electrodes may be referred to as a “pseudo capacitor” below. ) Does not need to be the same, but may be another type of measured value corresponding to the capacitance.

  FIG. 5 is a circuit diagram showing an outline of an electric circuit of the safety device 16 in the panel saw 10 employing the configuration according to the present invention. In the panel saw 10 of the present embodiment, as shown in FIG. 5, the safety device 16 includes a microcomputer MC, a capacitor C, resistance elements R2, R3, R4, R5, R6, R9, R10, R11, a transistor Q1, Q2 and Q3, and a relay U1 and the like.

  The microcomputer MC has "Arduino® Uno (Rev3)" designed and manufactured by Arduino LLC (USA) and Arduino® SRL (Italy) and "ATmega328P" manufactured by Atmel (USA) as a microcomputer chip. You are using The resistance value of the resistance element R2 is 100Ω, the resistance value of the resistance element R3 is 1 kΩ, the resistance value of the resistance element R4 is 1 MΩ, the resistance value of the resistance element R5 is 220Ω, and the resistance value of the resistance element R6 is 1 kΩ. The resistance value of the resistance element R9 is 10 kΩ, the resistance value of the resistance element R10 is 1 kΩ, and the resistance value of the resistance element R11 is 100Ω. Further, a general electromagnetic relay is used as the relay U1. The emergency stop button described above is connected to the input side (contact point side) of the relay U1.

  The capacitor C is not provided in the circuit as an electric element, and corresponds to the above-described pseudo capacitor (a pseudo capacitor in which the platen 11 and the clamp 12 are regarded as electrodes). For this reason, when the presence or absence or the material of the object disposed between the work supporting surface of the surface plate 11 and the work pressing surface of the clamp 12 changes, the capacitance of the capacitor C changes.

  That is, the capacitance of the pseudo capacitor C varies between the case where the work 20 is sandwiched between the surface plate 11 and the clamp 12 and the case where the body part such as the finger 30 is sandwiched. I do. When the capacitance of the pseudo capacitor C changes, the charging time of the pseudo capacitor C also changes according to the change of the capacitance. Therefore, by monitoring the charging time of the simulated capacitor C, it is possible to grasp whether or not a body part such as the finger 30 is sandwiched between the surface plate 11 and the clamp 12. Also in the panel saw 10 of the present embodiment, the capacitance detecting means 16a detects whether or not a body part is sandwiched between the surface plate 11 and the clamp 12 based on the charging time of the pseudo capacitor C. It has become something.

  The detecting portion (the portion to be an electrode) of the capacitance detecting means 16a is usually a conductive member provided on the work pressing surface side of the clamp 12. However, if the detecting unit of the capacitance detecting unit 16a is made of metal or the like, there is a possibility that the work 20 pressed by the clamp 12 is loose or the work 20 is damaged. Conversely, if the detecting portion of the capacitance detecting means 16a is formed of a soft material, it is possible to prevent the work 20 from rattling or scratching, but the friction of the clamp 12 against the work 20 increases, and the capacitance detecting means The work 20 tends to bite into the detection unit 16a. For this reason, in the panel saw 10 of the present embodiment, the detecting portion of the capacitance detecting means 16a is made of conductive hard rubber or hard elastomer.

  The detecting portion of the capacitance detecting means 16a may be provided only in a part of the section in the longitudinal direction of the clamp 12, but in this case, depending on a position of the clamp 12 where a body part such as the finger 30 is sandwiched. May not be able to detect that a body part is pinched by the clamp 12. For this reason, in the panel saw 10 of the present embodiment, the detection unit of the capacitance detection unit 16 a is provided over the entire section in the longitudinal direction of the clamp 12. This makes it possible to detect which part of the body of the clamp 12 is pinched.

  The safety control unit 16b determines that the capacitance-related value (the charging time of the pseudo capacitor C in the panel saw 10 of the present embodiment) detected by the capacitance detection unit 16a is out of the predetermined range (step S2 in FIG. 6). ), And outputs a circular saw drive disable signal (cutting blade drive disable signal) to the circular saw drive motor 14b (step S3 in FIG. 6). FIG. 6 is a flowchart showing an example of a process executed by the safety control means 16b in the panel saw 10 employing the configuration according to the present invention.

  The circular saw drive motor 14b stops when it receives the above-mentioned circular saw drive disable signal when it is driven, and starts its driving when it receives the above circular saw drive disable signal when it is not driven. It is in a state where it is not performed. Thus, when the body part such as the finger 30 is pinched by the clamp 12, a state in which the circular saw 14a is not driven is automatically generated without requiring an operation of an operator.

  In the panel saw 10 of the present embodiment, the series of processes shown in FIG. 6 is executed not only after the driving of the circular saw 14a is started but also before the circular saw driving motor 14b drives the circular saw 14a. It is supposed to be. As a result, it is possible to ensure the safety of the worker more reliably. In the panel saw 10 of the present embodiment, the safety control means 16b is the microcomputer MC in FIG. 5, and is attached to an upper part on the front surface of the clamp support member 13, as shown in FIGS.

  As described above, the panel saw 10 of the present embodiment detects the pinching of the body part by the clamp 12 by the change in the capacitance-related value of the pseudo capacitor C formed by the surface plate 11 and the clamp 12. It has become. For this reason, even when the portion of the work 20 pressed by the clamp 12 has irregularities, it is possible to stably detect the clamping of the body part by the clamp 12. Further, the portion (detection portion) for detecting the pinching of the finger 30 or the like has excellent durability.

10 Panel saw (work cutting device)
11 Surface plate (work support member)
11a Slit 12 Clamp (Work pressing member)
13 Clamp support member 14 Work cutting means 14a Circular saw (cutting blade)
14b Circular saw drive motor (cutting blade drive means)
14c Rotary shaft 14d Bearing 14e First pulley 14f Output shaft 14g Second pulley 14h V-belt 15 Operation box 16 Safety device (safety device for work cutting device)
20 Work 30 Finger

Claims (4)

A work supporting member for supporting the work from one side,
A work pressing member for pressing the work supported by the work support member from the other side,
A cutting blade for cutting the vicinity of a portion of the work pressed by the work pressing member,
A workpiece cutting device including a cutting blade driving unit for driving the cutting blade,
Capacitance detecting means for detecting a value related to the capacitance between the work supporting surface of the work supporting member and the work pressing surface of the work pressing member (hereinafter referred to as “capacitance related value”); ,
When the capacitance-related value detected by the capacitance detecting unit is out of a predetermined range, a safety control unit that outputs to the cutting blade driving unit a cutting blade driving disable signal that disables driving of the cutting blade driving unit. A workpiece cutting device further provided.
2. The workpiece cutting device according to claim 1, wherein the detection unit of the capacitance detection unit is a conductive hard rubber or a hard elastomer provided on the work pressing surface of the work pressing member.
After the work pressing member starts the operation of pressing the work against the work supporting member, before the cutting blade driving means drives the cutting blade, the detection of the capacitance related value by the capacitance detecting means And outputting a cutting blade drive disable signal by the safety control means (only when the capacitance-related value detected by the capacitance detection means is out of the predetermined range). 3. The work cutting device according to 1 or 2.
A work supporting member for supporting the work from one side,
A work pressing member for pressing the work supported by the work support member from the other side,
A cutting blade for cutting the vicinity of a portion of the work pressed by the work pressing member,
Attached to a work cutting device having a cutting blade driving means for driving the cutting blade,
A safety device for a work cutting device that prevents a cutting blade from being driven when a body part is sandwiched in a work pressing member,
Capacitance detecting means for detecting a value related to the capacitance between the work supporting surface of the work supporting member and the work pressing surface of the work pressing member (hereinafter referred to as “capacitance related value”); ,
When the capacitance-related value detected by the capacitance detecting unit is out of a predetermined range, a safety control unit that outputs to the cutting blade driving unit a cutting blade driving disable signal that disables driving of the cutting blade driving unit. A safety device for a work cutting device, comprising:

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