JP4509468B2 - Cutting machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manual operation type cutting machine used for cutting, for example, woodworking materials and non-ferrous metal materials, and more particularly to a cutting machine capable of reducing the time required for an operator to perform work cutting work.
[0002]
[Prior art]
A conventional cutting machine of this type is provided with a bearing 12 on the upper surface of a base 11 as shown in FIG. 6, and a cutting machine main body 14 is mounted on the bearing 12 via a support shaft 13 so as to be reciprocally rotatable in the vertical direction. ing. The cutting machine main body 14 includes a blade case 15 and a circular saw blade 17 that is rotatably mounted on the blade case 15 by a motor (not shown). The blade case 15 is always urged to rotate counterclockwise about the support shaft 13 by a torsion spring 18 interposed between the base 11 and a circular saw blade 17 is supported on the upper surface of the base 11. The workpiece W is held above the workpiece W. A handle 20 is provided at the upper end of the blade case 15 to push down the cutting machine main body 14 against the urging force of the torsion spring 18, and the circular saw blade 17 is rotated in the vicinity of the handle 20. An activation switch SW is provided for this purpose. (See Patent Document 1)
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 10-109302
[Problems to be solved by the invention]
In the conventional cutting machine, the workpiece W is placed on the upper surface of the base 11 and the activation switch SW is turned on to hold the handle 20. Then, the cutting machine main body 14 is rotated clockwise against the elastic force of the torsion spring 18 around the support shaft 13 and the work W is cut by pressing the circular saw blade 17 against the work W. After the cutting of the workpiece W, when the worker releases the handle 20 by the stored torsion spring 18, the cutting machine main body 14 is automatically rotated counterclockwise around the support shaft 13. , The upper retracted position is restored.
[0005]
However, since the conventional cutting machine needs to hold the handle 20 during the cutting work of the workpiece W, there is a problem that the time for engaging in the cutting work of the workpiece W cannot be shortened.
[0006]
An object of the present invention is to provide a cutting machine capable of solving the above-described problems in the prior art and shortening the time required for work cutting work.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the invention according to claim 1 is characterized in that a cutting machine main body is mounted on a base so as to be reciprocally rotatable in a vertical direction via a support shaft, and the cutting machine main body is always retracted upward. the carriage return moment application means for returning to the position provided, in the cutting machine so as to cut the workpiece by the circular saw blade mounted on the saw unit, the return by the returning moment application means relative to the cutting machine body moments against the provided disconnect moment applying unit moments to grant to the cutting direction of the workpiece, releases the function of the cutting moment applying means after completion cutting of the workpiece, automatically return moment than disconnected moment the motor Mento reversing mechanism for increasing the provided, the cutting moment application means, the guide rail which is mounted in the inclined state of the forwardly downward at all times with respect to the cutting machine main body A cutting moment applying weight supported so as to be switchable between a cutting moment non-applying position provided at the lower end of the guide rail and a cutting moment applying position provided at the upper end, and the weight on the guide rail. The moment reversing mechanism is configured such that the application weight is moved from the non-application position to the application position by an operator, and the application weight is moved to the application position by the engagement mechanism. When the cutting machine body is rotated from the start position to the end position of the workpiece cutting operation by the applied weight in the locked state, the locked state of the locking mechanism is released and the cutting moment is applied. An unlocking mechanism for moving the weight from the application position to the non-application position along the guide rail by the weight of the weight. Made is the gist that are.
[0011]
According to a second aspect of the present invention, in the first aspect , the locking mechanism is capable of reciprocating in the vertical direction within a predetermined angle range in the vicinity of the guide rail, and always has the cutting moment by the biasing member. A locking lever biased to a locking position for locking the application weight, wherein a pivotal fulcrum of the latching lever is set at an intermediate portion of the lever, and is more than the pivotal fulcrum of the locking lever. upper part is advanced into the movement locus of the cutting moment imparted weights sites below said rotation fulcrum is extended towards lower diagonally forward, the unlocking mechanism is provided on the base side, And an unlocking member that interferes with the lower end of the locking lever and switches the locking lever from the locking position to the non-locking position when the cutting machine body is moved to the end position of the workpiece cutting operation. It is a summary.
[0015]
A third aspect of the present invention is summarized in that, in the first or second aspect , the return moment applying means is an urging member provided between the base and the cutting machine body.
[0016]
According to a fourth aspect of the present invention, in the first or second aspect , the return moment applying means is a return weight provided at the front end of the cutting machine main body so as to be positioned forward of the support shaft. The gist.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a cutting machine embodying the present invention will be described with reference to FIGS.
[0018]
FIG. 1 shows the left side of the cutting machine. In FIG. 1, the left side is referred to as the front, and the right side is referred to as the rear.
A bearing 12 is fixed to the upper surface of the front end portion of the base 11, and a cutting machine main body 14 is mounted on the bearing 12 via a support shaft 13 so as to be tiltable in the vertical direction. The cutting machine main body 14 is a circular saw rotated by a blade case 15 tilted about the support shaft 13 and a motor (not shown) housed in the blade case 15 and fixed to the side wall of the blade case 15. The blade 17 is constituted. The torsion spring 18 as a carriage return moment applying means is provided between the front end portion of the blade case 15 and the front end portion upper surface of the base 11 is interposed. Then, the cutting machine main body 14 is always urged to rotate counterclockwise about the support shaft 13 in FIG. 1, and the circular saw blade 17 is held at the retracted position spaced upward from the base 11. Yes.
[0019]
A workpiece position regulating member 19 is provided on the upper surface of the base 11, and the workpiece position regulating member 19 regulates the position of one end of the workpiece W so that the workpiece does not move during cutting work. A die for clamping the workpiece W may be provided on the upper surface of the base 11.
[0020]
Next, in the cutting process of the workpiece W by the circular saw blade 17, the workpiece W is automatically cut by applying a turning moment in the clockwise direction around the support shaft 13 from the retracted position. for cutting moment applying mechanism 21 as disconnected moment applying means which is adapted to be described.
[0021]
A support frame 22 is fixed to the left side surface of the blade case 15 by a bolt, welding, or the like in a forwardly inclined state. A guide rail 23 is always attached to the upper surface of the support frame 22 with bolts or the like in a state of being inclined forward and downward. A cutting moment applying weight 24 (hereinafter simply referred to as a weight) is attached to the guide rail 23 so as to be able to reciprocate along the guide rail 23, and a handle 27 is attached to the weight 24 via auxiliary weights 25 and 26. ing. A lower stopper 28 for restricting the lower limit position of the weight 24 is attached to the lower ends of the support frame 22 and the guide rail 23 by bolts or welding. An upper stopper 29 for restricting the upper limit position of the weight 24 is fixed to the upper end surfaces of the support frame 22 and the guide rail 23 by bolts.
[0022]
As shown in FIG. 2, in the state where the weight 24 is moved to the lower limit position of the guide rail 23, the counterclockwise return moment M1 by the torsion spring 18 acting on the cutting machine body 14 is the clockwise cutting moment. It becomes larger than M2, and the cutting machine main body 14 is held in the retracted position. The lower limit position is set as a non-giving position P1 of the cutting moment M2. On the contrary, when the weight 24 is moved to the upper limit position of the guide rail 23 as shown in FIG. 3, the cutting moment M2 becomes larger than the return moment M1 acting on the cutting machine body 14, and the cutting machine body. 14 is rotated from the retracted position to a position where the workpiece W is cut. The upper limit position is defined as a cutting moment M2 application position P2.
[0023]
As shown in FIG. 1, a locking lever 30 is attached to the side surface of the support frame 22 so as to be tiltable in the vertical direction by a connecting pin 31 at an intermediate portion thereof. First and second locking pins 32 and 33 project from the side surface of the support frame 22 and the side surface of the locking lever 30, and the locking lever 30 is weighted to the first and second locking pins 32 and 33. A spring 34 as a biasing member for biasing the latching position 24 is latched. Further, on the side surface of the support frame 22, the position where the locking lever 30 rotates counterclockwise about the connecting pin 31 is regulated to hold the locking lever 30 in the locking position. A stopper 35 is provided. With the stopper 35 held in the locking position by the stopper 35, the upper end portion 30 a as a portion positioned above the connecting pin 31 of the locking lever 30 enters the movement locus of the weight 24. Like to do. When the weight 24 is lifted obliquely upward from the non-applying position P1 along the guide rail 23 by the operation of the handle 27, the upper end portion 30a of the locking lever 30 resists the urging force of the spring 34 downward by the weight 24. And pushed down. For this reason, since the weight 24 gets over the upper end portion 30a of the locking lever 30, the weight 24 is held at the application position P2 by the upper end portion 30a of the locking lever 30 returned to the locking position.
[0024]
In this embodiment, the support frame 22, the guide rail 23, the weights 24 to 26, the handle 27, the locking lever 30, the connecting pin 31, the first locking pin 32, the second locking pin 33, the spring 34 and the stopper 35. Thus, a cutting moment applying mechanism 21 for applying a cutting moment M2 to the cutting machine main body 14 is configured. In this embodiment, a locking mechanism 36 for locking the weight 24 to the application position P2 of the cutting moment M2 is configured by the locking lever 30, the spring 34, the stopper 35, and the like.
[0025]
Next, after the workpiece has been cut, the cutting moment M2 about the support shaft 13 acting on the cutting machine main body 14 is made smaller than the return moment M1, and the cutting machine main body 14 is rotated counterclockwise to the retracted position. for model Mento reversing mechanism 37 so as to return to explain.
[0026]
The protrusion 19a formed integrally with the upper part of the workpiece position restricting member 19 corresponds to the operated portion 30b which is a portion of the locking lever 30 in front of the connecting pin 31, and serves as an unlocking mechanism. An unlocking member 38 is arranged. Then, in a state where the cutting machine main body 14 is rotated in the clockwise direction in FIG. 1 around the support shaft 13 and the cutting of the workpiece W by the circular saw blade 17 is finished, the locking release member 38 holds the locking lever. The 30 operated parts 30b are pushed upward relatively. Thereby, the locking lever 30 is switched from the locking position where the weight 24 is locked to the non-locking position. By this switching operation, the weight 24 is moved by its own weight along the guide rail 23 from the applying position P2 to the non-applying position P1, so that the return moment M1 becomes larger than the cutting moment M2 and the cutting machine body 14 is moved to the cutting end position. It is made to return to the upper retreat position from.
[0027]
Next, the operation of the cutting machine configured as described above will be described.
In FIG. 1, the workpiece W is held at a predetermined position on the upper surface of the base 11 by a workpiece position restricting member 19, the weight 24 is held at a non-applying position P <b> 1 of the cutting moment M <b> 2, and the cutting machine body 14 holds the spindle 13 by the torsion spring 18. It shows a state in which it is rotated counterclockwise around the center and held in the retracted position. In this state, the handle 27 is gripped, and the weights 24, 25, and 26 are moved rearward and obliquely upward along the guide rail 23 as shown in FIG. In this movement process, the weight 24 causes the locking lever 30 to rotate clockwise by a small angle around the connecting pin 31 against the urging force of the spring 34, and the weight 24 moves the upper end 30 a of the locking lever 30. get over. Then, as shown in FIG. 3, the locking lever 30 is rotated by a small angle counterclockwise about the connecting pin 31 by the accumulated force of the spring 34, and the lower end edge of the weight 24 is the front end surface of the upper end 30a. The weight 24 is held at the application position P2 of the cutting moment M2.
[0028]
In this state, the starter switch SW of the cutting machine is turned on, and the circular saw blade 17 is rotated by a motor (not shown). When the operator releases his / her hand from the cutting machine main body 14, the cutting moment M 2 is larger than the return moment M 1, so that the cutting machine main body 14 is rotated clockwise around the support shaft 13. The For this reason, the workpiece W is automatically cut by the circular saw blade 17.
[0029]
Then, as shown in FIG. 4, when the cutting machine main body 14 is rotated in the clockwise direction and moved to a position where the cutting of the workpiece W is finished, the operated portion 30b of the locking lever 30 is moved to the workpiece position regulating member. It is pushed upward relatively by an unlocking member 38 provided on the 19 side. For this reason, the locking lever 30 is rotated by a small angle clockwise around the connecting pin 31 against the stored force of the spring 34, and the upper end 30 a is separated from the lower end edge of the weight 24. Accordingly, the weights 24 to 26 are moved diagonally forward and downward along the guide rail 23 from the application position P2 by their own weight, and stopped at the non-application position P1 that contacts the lower stopper 28. Then, the counterclockwise return moment M1 is larger than the clockwise cutting moment M2 acting on the cutting machine body 14, and the cutting machine body 14 rotates counterclockwise around the support shaft 13 as shown in FIG. It is rotated in the direction and returned to the retracted position.
[0030]
According to the cutting machine of the said embodiment, the following characteristics can be acquired.
(1) In the above embodiment, the cutting moment applying mechanism 21 is mounted on the cutting machine body 14, and the weight 24 is cut by the upper end portion 30a of the locking lever 30 by pulling up the weight 24 by operating the handle 27. Is held at the application position P2. When the operator releases his hand from the handle 27, the cutting machine main body 14 automatically rotates clockwise about the support shaft 13 to cut the workpiece W with the circular saw blade 17. Further, after the workpiece W is cut, the locking lever 30 is switched from the locking position to the non-locking position, and the cutting machine body 14 is rotated counterclockwise about the support shaft 13 to return to the retracted position. It was made to be. For this reason, it is not necessary for the operator to perform the work of cutting the workpiece W by operating the handle, and it is possible to reduce the time for the operator to engage in the work of cutting and reduce the cost of the work of cutting the work.
[0031]
(2) In the above embodiment, the cutting moment applying mechanism 21 is constituted by the guide rail 23, the weight 24, the locking lever 30, the stopper 35, and the like. For this reason, the structure of the cutting moment provision mechanism 21 can be simplified and manufacture and assembly | attachment work can be performed easily.
[0032]
(3) In the above embodiment, since the moment reversing mechanism 37 is configured by the locking release member 38 provided on the workpiece position regulating member 19, the structure can be simplified and the manufacturing and assembling operations can be easily performed.
[0033]
(4) In the above embodiment, the operated portion 30b of the locking lever 30 is disposed close to the workpiece position regulating member 19 side, so that the locking lever 30 interferes with the workpiece W during the work of cutting the workpiece W. Can be prevented.
[0034]
In addition, you may change this embodiment as follows .
[0039]
Although not shown, a return moment applying weight may be provided at the front end of the blade case 15 instead of the torsion spring 18 .
[0040]
Although not shown, a locking portion such as a locking hole or a locking step portion is provided at the upper end portion of the guide rail 23, and a locking protrusion or a locking lock that is locked to the locking portion on the lower surface of the weight 24 is provided. A locked part such as a stop part is provided. An unlocking protrusion as an unlocking member is provided on the upper surface of the rear end portion of the base 11 so as to correspond to the rotation trajectory of the locking portion.
[0041]
In this alternative example, when the locked portion of the weight 24 is locked to the locking portion, the cutting machine main body 14 automatically starts cutting the workpiece W. When the work cutting operation is finished, the locked portion of the weight 24 is pushed upward by the locking release projection, the locked portion is released from the locking portion, and the weight 24 is moved along the guide rail 23 by its own weight. Moved down. For this reason, since the weight 24 is moved to the non-applying position where the cutting moment is not applied, the cutting machine main body 14 is returned to the retracted position.
[0042]
【The invention's effect】
As described above in detail, the present invention can shorten the time for engaging in the work cutting work, greatly reduce the labor cost required for cutting the work, and reduce the work cutting work cost. Can do.
[Brief description of the drawings]
FIG. 1 is a left side view showing an embodiment of a cutting machine according to the present invention.
FIG. 2 is a left side view for explaining operations of a cutting moment applying mechanism and a moment reversing mechanism.
FIG. 3 is a left side view for explaining operations of a cutting moment applying mechanism and a moment reversing mechanism.
FIG. 4 is a left side view for explaining operations of a cutting moment applying mechanism and a moment reversing mechanism.
FIG. 5 is a left side view illustrating operations of a cutting moment applying mechanism and a moment reversing mechanism.
FIG. 6 is a left side view of a conventional cutting machine .
[Explanation of symbols]
W: Workpiece, M1: Restoring moment, M2: Cutting moment, P1: Non-applied position, P2: Applied position, 11: Base, 13: Support shaft, 14: Cutting machine body, 17: Circular saw blade, 23: Guide rail , 24 ... cutting moment applying weight, 30 ... locking lever, 36 ... locking mechanism, 37 ... moment reversing mechanism, 38 ... locking release member , 6 3 ... spring.

Claims (4)

Base via a support shaft is mounted a vertically reciprocating pivotally cutting unit of, always the cutting machine body provided with a carriage return moment application means for returning to the upper retreat position, the cutting machine body In a cutting machine that cuts the workpiece with a circular saw blade attached to
Against the return moment by the return moment application means relative to the cutting machine body provided with a disconnect moment application means to grant moment in the cutting direction of the workpiece, the functionality of the cutting moment applying means after completion cutting of the workpiece to release, the motor Mento reversing mechanism for automatically increasing the return moment than disconnecting moment provided,
The cutting moment applying means includes a guide rail that is always attached to the cutting machine main body in an inclined state, and a cutting moment provided at the lower end of the guide rail and a cutting moment provided at the upper end. A cutting moment applying weight supported so as to be switchable between positions, and a locking mechanism for locking the weight to the applying position on the guide rail,
The moment reversing mechanism is configured such that the application weight is moved from the non-application position to the application position by an operator, and the application weight is locked to the application position by the locking mechanism, and the cutting machine body is moved by the application weight. When the workpiece is turned from the start position to the end position of the workpiece cutting operation, the locking mechanism is released, and the cutting moment applying weight is moved along the guide rail by the weight of the weight. The cutting machine comprised by the latch release mechanism for moving to the said non-applying position from an application position . 2. The locking position according to claim 1 , wherein the locking mechanism is capable of reciprocating in the vertical direction within a predetermined angle range in the vicinity of the guide rail, and always locks the cutting moment applying weight by a biasing member. A locking lever biased by the rotation lever, wherein a pivotal fulcrum of the locking lever is set at an intermediate portion of the lever, and a portion above the pivotal fulcrum of the locking lever is the cutting moment applying weight. are entered into the movement in the trajectory of the site of lower than the pivot point is extended towards lower diagonally forward, the unlocking mechanism is provided on the base side, and cutting the cutting machine body work A cutting machine that is an unlocking member that, when moved to the end position of the work, interferes with the lower end of the locking lever and switches the locking lever from the locking position to the non-locking position. 3. The cutting machine according to claim 1, wherein the return moment applying means is an urging member provided between the base and the cutting machine body. According to claim 1 or 2, the return moment application means, the cutting machine is returning weight provided so as to be positioned further forward than the support shaft to the distal end of the cutting unit.

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