JP4177066B2 - Cutting machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cutting machine that cuts a material to be cut such as all screw bolts with a pair of blades.
[0002]
[Prior art]
A cutting machine such as a full-thread cutter includes a pair of blades, a fixed blade and a movable blade that is pivotably mounted opposite to the fixed blade, and one of the blades is above the housing. It is provided sideways so that the tip of both blades is exposed. In addition, a cam-driven rotating cam is provided in the housing, and a roller provided at the base end of the movable blade is slid along the cam, thereby swinging the movable blade and fixing its tip to a fixed blade. The material to be cut such as all screw bolts can be cut by the shearing action of both blades.
On the other hand, such a cutting machine is provided with a hanging hook at the rear end of the housing so as to be convenient for carrying or temporarily placing it when not in use. The hook can be folded along the housing by rotating to the housing side so as not to interfere with the use of the cutting machine (for example, Patent Document 1).
[0003]
[Patent Document 1]
JP-A-8-174329 (FIG. 11)
[0004]
[Problems to be solved by the invention]
However, in the above-mentioned cutting machine, for example, when the work place is dark or narrow and it is difficult to see the tip portions of both blades, it is difficult to position the material to be cut and the workability is not good.
Further, when a cutting operation is performed with the cutting machine placed on the ground or the like, if the material to be cut is all screw bolts, the cutting portion is set between the movable blade at the open position and the fixed blade for cutting. However, when a long material to be cut or the like is cut, the material to be cut is inclined, and it is difficult to fix the material to be cut at a right angle with respect to the operation direction of the movable blade.
[0005]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a cutting machine that is easy to use by improving workability during positioning and cutting.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is fixed to a housing in a use position that is rotatably attached to the housing and protrudes rearward of the housing, and a folding position along the lower surface of the housing. A hook for hanging is provided, and a positioning part for the material to be cut is formed on the hook. When the hook is used, the positioning part comes into contact with the material to be cut behind the cutting position by the fixed blade and the movable blade. Thus, the material to be cut can be supported .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an all-screw cutter as a cutting machine, with the left side being a vertical cross-sectional view and the right side being a cross-sectional explanatory view of a light part described later. In the figure, a full screw cutter 1 is a rechargeable type in which a battery pack 3 containing a plurality of batteries is detachably attached to the rear end (left side of the longitudinal sectional view) of the main body housing 2. The DC motor 4 is accommodated. A trigger switch 6 that is turned on when the trigger 7 is pushed in is accommodated in a handle 5 that extends above the main body housing 2. A control unit 8 is housed above the DC motor 4 in the main body housing 2 and is connected to the battery pack 3, the DC motor 4, the trigger switch 6 and the like, and controls the driving of the DC motor 4 as will be described in detail later. To do.
[0008]
Further, an output shaft 10 is coaxially supported via a planetary gear speed reduction mechanism 9 in front of the DC motor 4 and protrudes forward of the main body housing 2, and at the tip of the output shaft 10 as shown in FIG. The half-moon-shaped cam 11 is fixed orthogonally. Further, a fixed blade 12 is fixed in a lateral direction above the cam 11 at the front end of the main body housing 2, and is movable with the blade edge facing the blade edge of the fixed blade 12 on the front side and the upper position of the fixed blade 12. The blade 13 is pivotally attached by a bolt 14 so as to be swingable. Reference numeral 15 denotes a front cover that is assembled from the front of the main body housing 2 and closes the main body housing 2. The front cover 15 covers the cam 11, the fixed blade 12, the movable blade 13, and the like. On the left side, projecting portions 17 and 16 that respectively cover the lower side of the fixed blade 12 and the upper side of the movable blade 13 are provided so as to project vertically, and between the projecting portions 17 and 16, the fixed blade 12 and the movable blade 12 are movable. An opening 18 that exposes the blade tip portion of the blade 13 is formed in the front-rear direction.
[0009]
On the other hand, in the movable blade 13, a roller 19 is provided at the end opposite to the blade edge. The end is on the side of the block 20 in which the upper end is fixed to the main body housing 2 and the lower end is fixed to the rear surface of the movable blade 13. The roller springs 21 are always brought into contact with the circumferential surface of the cam 11 by being urged in the counterclockwise direction of FIG. Therefore, as the cam 11 rotates to the right, the roller 19 slides along the bulging portion 11a of the cam 11 so that the end of the movable blade 13 is pushed up. The blade 12 is closed. Subsequently, when the roller 19 passes over the bulging portion 11a of the cam 11 and reaches the flat portion 11b, the end of the movable blade 13 is pushed down by the bias of the coil spring 21, and the movable blade 13 rotates counterclockwise to open. This opening / closing operation is continuously possible as the cam 11 rotates.
[0010]
Further, the block 20 of the movable blade 13 is provided with a pair of pins 22 and 22 projecting rearward at a predetermined interval in the vertical direction. The body housing 2 facing the pins 22 has a swing of the movable blade 13. A top dead center detection switch 23 and a bottom dead center detection switch 24, which are respectively located on the movement trajectory of each pin 22 associated with the movement, are provided, respectively, so that the bottom dead center on the blade tip side of the movable blade 13 (see FIG. 2C). In the closed position), the upper pin 22 turns on the bottom dead center detection switch 24, and in the top dead center (the open position in FIG. 2A), the lower pin 22 turns on the top dead center detection switch 23. It has become.
[0011]
A return plate 25 having a cam hole 26 formed below is integrally fixed to the front surface side of the movable blade 13, and a pin 27 protruding from the front surface of the cam 11 toward the bulging portion 11 a is connected to the cam hole 26. It is made to contact | abut to the inner periphery. When the movable blade 13 is opened from the bottom dead center, the return plate 25 forcibly opens the movable blade 13 from the bottom dead center by sliding contact with the cam hole 26 of the pin 27 as the cam 11 rotates. With this return plate 25, the opening of the movable blade 13 can be surely opened even when the cutting edge of the movable blade 13 bites into the material to be cut such as all screw bolts and the coil spring 21 does not rotate only to the left. It becomes.
[0012]
On the other hand, a switching plate 28 having left and right ends protruding outward is provided in front of the trigger switch 6 in the handle 5 in the main body housing 2 so as to be slidable left and right in a direction orthogonal to the main body housing 2. By the sliding operation of the changeover plate 28, the forward / reverse changeover switch 29 can be switched by moving the lever 30 of the forward / reverse changeover switch 29 arranged in front of the trigger switch 6 to the left or right. Specifically, as shown in FIG. 3, when the switching plate 28 is in the left position (FIG. 3A), the lever 30 is also in the left position and the forward / reverse selector switch 29 is rotated forward, and the switching plate 28 is in the right position ( In FIG. 5C, the lever 30 is also in the right position, and the forward / reverse selector switch 29 is switched to reverse rotation. At the neutral position of the switching plate 28 (FIG. 5B), the protrusion 31 provided at the front end of the trigger 7 is engaged with the stopper 32 provided at the center of the rear surface of the switching plate 28, and the trigger 7 is pushed in. I try to prevent it.
[0013]
Further, on the front side of the switching plate 28, a forward / reverse detection switch 33 is arranged in the drive circuit of the DC motor 4 and outputs a switching signal to the control unit 8, and at the center of the front surface of the switching plate 28. A pair of guide projections 35, 35 are projected in a manner sandwiching the lever 34 at the upper end of the forward / reverse detection switch 33. The lever 34 can also be switched. That is, it is a rational structure in which the forward / reverse selector switch 29 and the forward / reverse detection switch 33 can be switched simultaneously with one switching plate 28.
Further, a light 36 using an LED lamp is arranged in front of the forward / reverse detection switch 33 and on the upper side. As shown in FIG. 4A, the light 36 is housed downward in the protruding portion 16 on the main body housing 2 side, and is fixed to the fixed blade 12 through a through hole 37 provided below the protruding portion 16. And the open part 18 which the movable blade 13 exposes can be irradiated from back.
[0014]
On the other hand, a hanging hook 38 is provided near the rear end of the lower part of the main body housing 2. As shown in FIG. 4, the hook 38 is made of a metal rod-like body bent in a U-shape, and has a mounting end 39 projecting from the left side surface of the main body housing 2 to the inner surface of the main body housing 2. The mounting end 39 is slidably mounted to the main body housing 2 so as to be slidable to the left and right, and is rotatably mounted by inserting the stopper 43 at an outlet on the inside of the boss 42. However, since the coil spring 44 is externally mounted on the mounting end 39 between the boss 42 and the stopper 43, the hook 38 is urged to the right so that the mounting end 39 enters the body housing 2 side. The Reference numeral 45 denotes a groove-like fitting portion that is recessed in the left-right direction at the front side of the lower surface of the main body housing 2 so that the hooking end portion 40 of the hook 38 that has been turned around the lower side of the main body housing 2 can be fitted. When the hook 38 is not used, the hook 38 can be folded and fixed without interfering with the use of the entire screw cutter 1 by fitting the latching end 40 into the fitting portion 45 as shown in FIG.
[0015]
Further, a support protrusion 46 having an inclined groove 47 that can be fitted and fixed to the intermediate portion 41 of the hook 38 in a backward inclined posture is protruded from a rear side portion of the hook side of the main body housing 2 on the attachment side. The hook 38 can be fixed in an inclined posture by fitting the intermediate portion 41 of the hook 38 pulled out to the side against the bias of the coil spring 44 into the inclined groove 47 as shown in FIG. Yes. By fixing the hook 38 in this way, the entire screw bolt 48 that allows the open portion 18 to pass between the fixed blade 12 and the movable blade 13 can be passed below the latching end portion 40. Here, an arcuate positioning portion 49 that bulges upward is formed at the middle portion 41 of the latching end portion 40, and all screw bolts 48 are in a straight line connecting the opening portion 18 and the positioning portion 49. It can be penetrated back and forth along.
[0016]
When the screw cutter 1 configured as described above is used in a state where it is placed on the ground or the like, it is fixed in an inclined posture in which the hook 38 is fitted in the inclined groove 47 as shown in FIG. A material to be cut (full screw bolt 48) is passed back and forth between the positioning portion 49 of the hook 38 and the movable blade 13 and the fixed blade 12 in the open position, and the cutting position is fixed to the fixed blade 12 and the movable blade 13. Position between. In this state, when the switching plate 28 is operated to switch to the forward rotation side and the trigger 7 is pushed in, the trigger switch 6 is turned ON and the control unit 8 causes the DC motor 4 to rotate forward. Therefore, both the output shaft 10 and the cam 11 rotate forward via the planetary gear speed reduction mechanism 9. Specifically, when the cam 11 starts rotating clockwise from the open position of the movable blade 13 shown in FIG. 2A and the roller 19 reaches the bulging portion 11a of the cam 11, the movable blade 13 is moved to the same figure (B). ) To the right to perform the closing operation, and the roller 19 reaches the end of the bulging portion 11a of the cam 11 and reaches the closed position in FIG. Thereafter, when the roller 19 reaches the flat portion 11b of the cam 11, the movable blade 13 rotates left by the bias of the coil spring 21 and the guide of the return plate 25 as shown in FIG. A series of cutting operations for returning to the open position in FIG. All screw bolts 48 can be cut by the shearing action of the two blades by this cutting operation.
[0017]
In particular, the shape of the cam 11 here is a half-moon-shaped bulged portion 11a with which the roller 19 slides when the movable blade 13 is closed. The part where the cutting force is applied to the blade 13, that is, the cutting state becomes long. Therefore, the average load applied to the cam 11 at the time of cutting is reduced, and there is an advantage that the movable blade 13 can perform a cutting operation without difficulty.
When the movable blade 13 returns to the state shown in FIG. 2A after the end of cutting, the top dead center switch 23 is turned on, so that the control unit 8 immediately stops the rotation of the DC motor 4, the output shaft 10, and the cam 11. . That is, here, the cutting operation shown in FIGS. 1A to 1D is performed only once, the movable blade 13 automatically stops at the open position, and thereafter, the trigger 7 is once released from the trigger switch. Unless 6 is turned off, the next cutting operation cannot be performed.
[0018]
At the time of this disconnection, the light 36 is turned on when the trigger switch 6 is turned on and turned off when the trigger switch 6 is turned off. Since the opening portion 18 is illuminated from behind the fixed blade 12 and the movable blade 13 by the lighting of the light 36, the operator can surely cut the cutting position by the fixed blade 12 and the movable blade 13 and all the screw bolts 48 even in a dark place. Visible and accurate cutting is possible.
On the other hand, since the rear end of all the screw bolts 48 penetrates the positioning portion 49 of the hook 38 from below at the time of cutting, the operator grasps the rear end of all the screw bolts 48 and attaches the entire screw bolt 48 to the positioning portion of the hook 38. All screw bolts 48 can be fixed at a right angle to the direction of movement of the movable blade 13 by simply pressing it to 49. Therefore, accurate cutting can be easily performed even with the long full screw bolt 48. Of course, when the full screw cutter 1 is not used, the hook 38 can be used to hang the channel screw or the like assembled horizontally in the construction work site, and can be used to suspend the full screw cutter 1.
[0019]
Thus, according to the all-screw cutter 1 of the said form, the positioning with all the screw bolts 48 and fixation at the time of a cutting | disconnection can be performed easily by the illumination by the light 36 and the support using the hook 38, and exact cutting | disconnection is possible. It becomes. Therefore, workability related to cutting is improved, and usability is improved.
In particular, here, since the hook 38 is used as a support for all the screw bolts 48, a rational structure using both the support and the hook is obtained, and the support can be obtained easily.
[0020]
In the above embodiment, the number of lights is one. However, a plurality of lights may be provided, or the same number may be arranged separately above and below the open portion, and the cutting position may be illuminated from different directions.
The hook is also shaped so that all screw bolts pass through the upper side, not the lower side of the hooking end, so that the positioning part bulges downward, or through the left and right sides of the intermediate part. It is possible to change the design such as forming a part.
[0021]
【The invention's effect】
According to the first aspect of the present invention, the workpiece can be easily positioned and fixed at the time of cutting using the support tool, and accurate cutting can be performed. Therefore, workability related to cutting is improved, and usability is improved.
In particular, the support of the material to be cut, since shared with hook for hanging to have a positioning portion of the workpiece, support can be easily obtained at a reasonable configuration.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a full screw cutter.
FIG. 2A is an explanatory view showing an operating state of the movable blade (the movable blade is in a fully open position).
(B) It is explanatory drawing which shows the operating state of a movable blade.
(C) It is explanatory drawing which shows the operating state of a movable blade (a movable blade is a fully closed position).
(D) It is explanatory drawing which shows the operating state of a movable blade.
FIG. 3A is an explanatory diagram showing a switching operation of a switching plate (forward rotation position).
(B) It is explanatory drawing which shows switching operation | movement of a switching plate (neutral position).
(C) It is explanatory drawing which shows switching operation | movement of a switching plate (reverse rotation position).
FIG. 4A is a left side view and a rear view of an all screw cutter (when a hook is used).
(B) It is the left view and back view of all the screw cutters (when not using a hook).
[Explanation of symbols]
1 .... All screw cutters 2 .... Main body housing 3 .... Battery pack 4 .... DC motor 6 ... Trigger switch 7 ... Trigger 8 ... Control unit 11 ... Cam 12 ... Blades, 13 ... movable blades, 19 ... rollers, 21 ... coil springs, 23 ... top dead center detection switches, 24 ... bottom dead center detection switches, 36 ... lights, 38 ... hooks, 48 ... all Screw bolt, 49 .... positioning part.

Claims (1)

A housing is provided with a fixed blade and a movable blade that is pivotally mounted opposite to the fixed blade so that either one of the blades faces upward to expose the tips of both blades, The housing includes a cam that is in sliding contact with the base end of the movable blade and rotated by a motor, and a switch. When the switch is turned on, the cam is rotated to turn the movable blade into the fixed blade. A cutting machine that can be opened and closed with respect to the material to be cut with both blades,
The housing is provided with a hanging hook that is rotatably attached to the housing and can be fixed to a use position protruding rearward of the housing and a folding position along the lower surface of the housing. The positioning part of the material to be cut is formed, and at the use position of the hook, the positioning part can contact the material to be cut and support the material to be cut behind the cutting position by the fixed blade and the movable blade. Cutting machine characterized by that.

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