JPH08174331A - Continuous thread cutting machine - Google Patents

Abstract

PURPOSE: To provide a continuous thread cutting machine capable of smoothly cutting an object to be sheared without any burrs produced. CONSTITUTION: A continuous thread cutting machine is provided for shearing an object to be sheared such as a continuous thread bolt, by a pair of cutting edges composed of a fixed edge 9 and a movable edge 11. The fixed edge 9 and the movable edge 11 are disposed so that sliding end faces 25 may be brought into close contact with each other. The sliding end surface 25 of the cutting edge of either the fixed blade 9 or the movable blade 11 is roughly aligned with the lead angle of a screw blade.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a full screw cutting machine.

[0002]

2. Description of the Related Art Conventionally, as a bolt cutting machine for cutting a fixed-length all-screw bolt used to suspend a lighting fixture, an air conditioner, etc. from a ceiling in a building or the like to a proper length at a construction site There is one as shown in Japanese Patent Laid-Open No. 63-127810. As shown in FIG. 8, this is a cutting action part 6 consisting of a pair of cutting blades 9 and 11 with one side surface of the main body part 4 arranged on the crocodile side to cut a sheared object a such as a full screw bolt to an appropriate length. It is designed to be cut.

[0003]

By the way, in a full-screw cutting machine, if the thread of the cut object a is crushed, the tightening of the nut or the like will occur, so it is important not to crush the thread. Is. However, the movable blade 11 and the fixed blade 9 used in the full-screw cutting machine in the conventional example as described above are cut off at the sliding end face 25 of each cutting blade as shown in FIGS. 9 and 10. It is in a vertical state orthogonal to the axis of the sheared object a, and the screw blade 2
Since the sliding end surface 25 is inclined with respect to the lead angle θ of 6 when the object to be sheared a formed of a hard material such as a stainless steel bolt is cut, burrs are generated at the cut portion of the object to be sheared a. There was a problem that post-treatment was required after the shearing work.

The present invention is intended to solve the above problems, and an object thereof is to provide a full-screw cutting machine capable of smoothly cutting an object to be sheared without causing burrs.

[0005]

In order to achieve the above object, in the present invention, a full-screw cutting machine for shearing an object to be sheared a such as a full-screw bolt with a pair of cutting blades consisting of a fixed blade 9 and a movable blade 11. In the above, the fixed blade 9 and the movable blade 11 are arranged so that the sliding end surface 25 is in close contact with each other.
The sliding end surface 25 of one of the cutting blades is substantially matched with the lead angle θ of the screw blade 26.

[0006]

According to the present invention, the sliding end surface 25 of the blade is attached to the screw blade 2
By making the lead angle θ of 6 substantially coincide with each other, the chipping of the cutting portion becomes stronger, and the object to be sheared a can be smoothly cut without causing burrs.

[0007]

The present invention will be described below in detail based on the illustrated embodiments. As shown in FIGS. 1 and 2, the full-screw cutting machine according to the present invention is mainly constructed by integrally projecting a handle portion 5 from a main body portion 4 accommodating a motor 1, a speed reducer 2, a cutting blade drive mechanism 3 and the like. The battery power source unit 7 including the battery pack 7a is detachably attached to the other end of the handle portion 5, and the full-screw cutting machine is a cordless portable type. A reinforcing piece 8 is provided between the other end of the handle portion 5 and the end of the main body portion 4. The reinforcing piece 8 is thus provided to reinforce the handle portion 5 to make the handle portion 5 thinner. I made it easy to grip 5. Further, the reinforcing piece 8 reinforces it so that it is not easily damaged even if it is dropped unexpectedly.

A cutting action portion 6 having a cutting blade is provided so as to project from the main body portion 4 in a direction opposite to the protruding direction of the handle portion 5 that is integrally provided so as to project from the main body portion 4. This cutting action portion 6 has a fixed arm 1 having a fixed blade 9 at its tip.
0 and a movable arm 12 having a movable blade 11 at the tip thereof, and the movable arm 1 with respect to the fixed blade 9 of the fixed arm 10.
The movable arm 12 is rotationally moved so that the movable blade 11 of 0 approaches or separates. The fixed blade 9 and the movable blade 11 are fixed to the tip of the fixed arm 10 or the movable arm 12 by a mounting bolt 17, respectively. The motor 1 is housed and arranged at one end in the main body portion 4, and a deceleration block 13 as a speed reducer 2 for increasing the rotational torque of the motor 1 is formed by a planetary gear next to the motor 1. Yes, and finally cam 14 on one side
Is transmitted to the cam shaft 15 as the cutting blade drive mechanism 3 forming the. The rotationally driven cam 14 is in contact with a roller 16 provided at the end of the movable arm 12 as shown in FIG. 4, and the rotational drive of the cam 14 is transmitted to the movable arm 12 via the roller 16. It is like this. According to the shape of the cam 14, the movable arm 12 to which the movable blade 11 is fixed at the upper end follows, so that the object to be sheared a such as all screw bolts can be sheared by the fixed blade 9 and the movable blade 11. ing.

The movable arm 12 is driven to rotate about the stepped shaft 18, but since the movable arm 12 operates along the cam surface, the cam 14 rotates in one direction to cause the fixed blade 9 to move. On the other hand, it is designed to oscillate within a certain range in which it comes close to and away from it. The movable arm 12 is positioned by the head of the stepped shaft 18 so that it cannot move in the axial direction, and the clearance between the movable blade 11 and the fixed blade 9 is kept constant even if a load is applied in the axial direction during cutting. It has become.

As shown in FIG. 7, the fixed blade 9 and the movable blade 11 are disposed so that the sliding end surface 25 is in close contact with each other, and the sliding end surface 2 of one of the fixed blade 9 and the movable blade 11 is a cutting blade.
5 is substantially matched with the lead angle θ of the screw blade 26.
In the illustrated embodiment, the sliding end surface 25 of the movable blade 11 (see FIG. 5), which is to be located on the necessary side total screw bolt X side shown in FIG. 3B when the object to be sheared a is sheared, The lead angle θ of the screw blade 26 is substantially matched. In this way, by making the sliding end surface 25 of the blade substantially coincide with the lead angle θ of the screw blade 26, the breakage of the cut portion becomes strong,
The object to be sheared a can be smoothly cut without causing burring, and burring is prevented from occurring in the shearing portion of the all-screw bolt X on the necessary side. All screw bolts Y on the unnecessary side shown in FIG. 3 (b) that are unnecessary after shearing
As shown in FIGS. 6 and 7, in the fixed blade 9 located on the side, the screw blade 26 facing the sliding end surface 25 is provided with a cutout portion 27, and the cutout portion 27 cuts the object to be sheared. A small burr is generated at the cutting portion of the fixed blade 9 side of a, so that the impact at the time of cutting can be suppressed, the cutting noise at the time of cutting can be prevented, and the life of the main body can be improved. . In addition, by creating a small burr in the cut part, all screw bolts Y on the unnecessary side
It is possible to suppress the scattering of the particles and ensure the safety during work.

Here, in the illustrated embodiment, the blade for making the sliding end surface 25 substantially coincide with the lead angle θ of the screw blade 26 is projected from the ceiling surface, the floor surface, the wall surface or the like. The case where the movable blade 11 is to be positioned on the side of the building when shearing the fixed object to be sheared a is shown, but since the unfixed object to be sheared a may be cut, the fixed blade 9 and It is desirable that the mounting position of the movable blade 11 can be exchanged.

When the object to be sheared a such as all screw bolts protruding from the ceiling, floor or wall is sheared at an arbitrary position, the handle portion 5 should be held by hand as shown in FIG.
(A) While observing the cutting action portion 6 and the object to be sheared a from the direction of the middle arrow a, the object to be sheared a is placed on the cutting action portion 6,
The object to be sheared a is sandwiched between the fixed blade 9 and the movable blade 11 at a position where the object to be sheared a is to be cut, and the switch 21 provided on the handle portion 5 is operated to move the movable arm 12 to move the fixed blade. The object 9 to be sheared is sheared by 9 and the movable blade 11.

[0013]

INDUSTRIAL APPLICABILITY The present invention relates to a full-screw cutting machine for shearing an object to be sheared such as a full-screw bolt with a pair of cutting blades consisting of a fixed blade and a movable blade, and the fixed blade and the movable blade are in close contact with each other so that the sliding end faces are in close contact. Since the sliding end face of one of the fixed blade and the movable blade is substantially aligned with the lead angle of the screw blade,
When shearing an object to be sheared by the movable blade and the fixed blade, the chipping portion of the cutting portion becomes strong, and the object to be sheared can be smoothly cut without causing burrs.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3A is a partially cutaway front view showing a usage state,
(B) is explanatory drawing explaining the cutting part of all the screw bolts.

4 (a) and 4 (b) are explanatory views for explaining the action of the cutting action portion.

FIG. 5 shows a movable blade, (a) is a front view,
(B) is a side view.

FIG. 6 shows a fixed blade, (a) is a front view,
(B) is a side view.

FIG. 7A is an explanatory view for explaining the arrangement state of a fixed blade and a movable blade, and FIG. 7B is a cross-sectional view taken along the line Loro of FIG.

FIG. 8 is a perspective view showing a conventional example.

FIG. 9 shows a movable blade in a conventional example,
(A) is a front view and (b) is a side view.

FIG. 10 shows a fixed blade in a conventional example,
(A) is a front view and (b) is a side view.

[Explanation of symbols]

 a Object to be sheared 9 Fixed blade 11 Movable blade 25 Sliding end surface 26 Screw blade θ Lead angle

Claims (1)

[Claims] 1. A full-screw cutting machine that shears an object to be sheared, such as a full-screw bolt, with a pair of cutting blades consisting of a fixed blade and a movable blade, wherein the fixed blade and the movable blade are arranged so that their sliding end faces are in close contact with each other. A full-screw cutting machine characterized in that the sliding end surface of one of the fixed blade and the movable blade is made to substantially match the lead angle of the screw blade.