JPH0739531Y2 - Spiral duct cutting device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spiral duct cutting device.

[0002]

2. Description of the Related Art A conventional spiral duct cutting device is
As shown in FIG. 5, a spiral duct mounting table in which a plurality of rolls are arranged in a V-shape in a side view and a column vertically installed on one side of the duct mounting table are vertically movable and rotatable about the column. It had a cutter blade mechanism attached.

[0003]

However, in the cutting device having the above-described structure, the chips and cut ends of the spiral duct often hit the face of the operator during cutting work, which is very dangerous. There is a problem that it is difficult to work in a narrow space because the range in which the cutting edges and the cut edges scatter over a wide range has a similar effect on the surrounding workers. In addition, since the spiral duct cuts while rotating the spiral duct with one hand of the person who does not operate the cutter blade mechanism only by placing it on the mounting table, the cutting position may move during rotation, which makes accurate cutting work difficult. There are challenges.

[0004]

According to the present invention, two front and rear rotating arms extending upward in a bowl shape with a meshing gear at the lower end serving as a fulcrum, and the upper and lower ends of the front and rear rotating arms are stretched. It has two left and right horizontal receiving rolls that operate together with the rotating arm to adjust and open and close, a rotating fulcrum that enables vertical movement and a coil spring for applying elasticity to one outside of the horizontal receiving roll. And two curved front and rear presser arms extending upward, and stretched between the upper ends of the presser arms to rotate on the center between the horizontal receiving rolls and the retracted position together with the presser arms with the elasticity of the coil spring. It is an object of the present invention to solve the above problem by providing a moving one-touch opening / closing type horizontal pressing roll and a rotary cutter blade mechanism in the lower middle part of the rotating arm group so as to move up and down.

[0005]

[Function] In order to match the outer diameter of the spiral duct to be cut, the left and right horizontal receiving rolls are mounted directly or by holding one of the rotating arms to appropriately open and close the space between the horizontal receiving rolls to mount the spiral duct. . Next, rotate the horizontal pressing roll at the retracted position together with the pressing arm to press the center of the spiral duct with elasticity, and finally press the spiral duct at three points from the top and bottom and rotate the cutter blade to raise the rotary cutter blade mechanism. The cutter blade is moved to cause the cutter blade to cut into the portion of the spiral duct to be cut, and the rotary cutter blade mechanism is fixed in this state, and the spiral duct is circulated once for cutting.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described below with reference to the drawings.

Longitudinal support plates 2a and 2b are provided so as to face each other in the front and rear, which is a longitudinal edge of the base 1 having a rectangular shape in a plan view, and have the same diameter at the horizontal position inside the upper ends of both support plates 2a and 2b. Of the rotating arms 4a, 4b and 4c, 4d in the form of left-right symmetry, in which the meshing gears 3a, 3b and 3c, 3d of FIG. The base ends are attached, and left and right horizontal receiving rolls 5a and 5b, which are cylindrical and rotatably parallel to each other, are stretched between the respective upper ends of the rotating arms 4a and 4c, 4b and 4d facing each other.

Reference numeral 6 designates a square bar-shaped distance adjusting bar which is mounted between the rotating arms 4a and 4b. One end of the rotating arm 4a is rotatably fixed to the middle of the rotating arm 4a and the other end is arranged in the middle of the rotating arm 4b. The stopper knob 7a is inserted through the attached rotatable square tube 7 and has a plurality of retaining holes 8 on the side surface near the other end of the stopper knob 7a provided on the outer surface of the square tube 7 by inward biasing. The horizontal receiving roll 5 is formed by inserting the tip into one of the hook holes 8.
Rotating arm 4 with the space between a and 5b adjusted wide and narrow
It fixes between a, 4b, 4c and 4d. Reference numeral 9 is a scale provided on the upper surface of the bar, facing each hooking hole 8,
The scale 8 is used to select the hooking hole 8 into which the stopper knob 7a is fitted according to the outer diameter of the spiral duct S to be cut, and to adjust the distance between the horizontal receiving rolls 5a and 5b.

A base 1 on one side of the horizontal receiving rolls 5a and 5b
The slide shaft yagura 10 is installed vertically, and the yagura 1
The movable body 11 for vertical movement is fitted to 0, and the front and rear side plates 11a and 11b of the movable body 11 are rotatable about the base ends of the pressing arms 12a and 12b whose front portions are curved inward. A column-shaped horizontal pressing roll 13 that is rotatable and is parallel to the horizontal receiving rolls 5a and 5b is stretched between the upper ends of the pressing arms 12a and 12b. 14 is a moving body 1
1 is a knob for fixing the vertical movement position, 15a and 15b are coil springs stretched between the holding arms 12a and 12b and the side plates 11a and 11b, and 16a and 16b are stop shafts.

Front and rear turning arms 4a, 4b, 4c, 4d
A rotary cutter blade mechanism 1 with a cutter blade 17a that vertically rotates in a direction orthogonal to the horizontal receiving rolls 5a and 5b below
Place 7. The rotary cutter blade mechanism 17 is supported by a parallel crank mechanism 18 of four levers having a fulcrum on the other side of the base 1, and one outer lever 18a is a fulcrum.
When the operating lever 20 attached to the end extended outward is tilted, the cutter blade 17a of the rotary cutter blade mechanism 17 is moved upward between the horizontal receiving rolls 5a and 5b. The rotary cutter blade mechanism 17 is attached to the fulcrum 19.
The ratchet mechanism 21 that allows only the rotation in the upward movement direction is provided, and is automatically fixed at an arbitrary upward movement position. Reference numeral 21a is an operation pin for releasing the fixation of the ratchet mechanism 21. In addition, an alignment line 22 indicating the cutting position by the cutter blade 17a is provided around the center of the horizontal receiving roll 5b for display.

The cutting device of the present invention has the above-mentioned structure,
When cutting the spiral duct S, first, a mark M indicating the cutting position is attached to the spiral duct S, and then the mark M is placed on the horizontal receiving rolls 5a and 5b in alignment with the alignment line 22 of the horizontal receiving roll 5b. After that, the presser arms 12a and 12b in the retracted position are rotated to bring the horizontal presser roll 13 into contact with the center of the upper surface of the spiral duct S.
The movable body 11 that is vertically movable is slightly moved downward and the knob 14 is tightened to fix the movable body 11, and the coil spring 1
The horizontal pressing roll 13 is pressed against the upper surface of the spiral duct S by the elastic action of 5a and 15b, and the horizontal receiving roll 5
The spiral duct S is held at three points between a and 5b. Next, the rotary cutter blade mechanism 17 is activated, the operation lever 20 is tilted, and the rotary cutter blade mechanism 17 is moved upward until the cutter blade 17a cuts into a part of the lower side of the spiral duct S and is moved by the ratchet mechanism 21. When the spiral duct S is fixed at the upper moving point and the spiral duct S is rotated to make one round, the cutting is completed.

During this time, the cutting powder resulting from the cutting of the spiral duct S mainly stays in the spiral duct S and downward. Further, as shown in FIG. 4, the cutter blade 1
The hose 2 is attached to the cylindrical portion 17c provided on the covering cover 17b of 7a.
When 3 is connected and a vacuum dust collecting device (not shown) is connected to the other end of the hose 23, the cutting dust is sucked into the vacuum dust collecting device, and the accumulation of the cutting dust is reduced as much as possible.
It is easy to clean up.

Further, the cut end generated by cutting the end portion of the spiral duct S also remains at the three-point presser and is prevented from jumping due to the rotational force of the cutter blade 17a, and falls off from the three-point presser. However, since it stays in the rotating arm, it is prevented from scattering around.

In a normal operation, since the spiral duct having the same diameter is continuously cut, in that case, the vertical movement position of the moving body 11 may be fixed, and thereafter, the horizontal pressing roll 13 or the pressing arm 12a. , 12b, the spiral duct can be held at three points only by one-touch opening / closing operation.

Further, in the embodiment of FIG. 1, since the relatively long spiral duct S is shown in a cut state, the lower end of the spiral duct on the non-cut side is supported by the auxiliary roll 24, but the spiral duct is short. In the case of, the horizontal pressing roll 13 similar to the wide horizontal receiving rolls 5a and 5b
Auxiliary roll 24 for the purpose of holding it by three-point support with
It is possible to perform stable cutting work without using.

[0016]

As described above, according to the present invention, the rotary cutter blade mechanism is provided below the horizontal receiving roll and the horizontal pressing roll in each of the two front and rear rotary arms, so that the spiral duct is cut. Even if the cutting edge receives the rotation of the cutter blade and a rebounding force is applied, it is pressed by the subsequent three-point support, and when it deviates from the three-point support, it remains in the rotating arm group and jumps out to the surrounding area. Since it is not present, there is an effect that it is possible to prevent injuries to surrounding workers and damage to surrounding devices.

Further, since the two left and right horizontal receiving rolls are stretched between the rotating arms that open and close in conjunction with each other with the meshing gear as a fulcrum, they rotate by touching one of the rotating arm group or the horizontal receiving rolls. As a result, there is an effect that the opening and closing can be easily adjusted in conjunction with each other.

The horizontal pressing roll is stretched between the upper ends of two front and rear pressing arms whose upper ends are pivotally positioned on the center between the horizontal receiving rolls by means of a pivot for allowing vertical movement. Even if the distance between the receiving rolls is adjusted to be wide or narrow, the horizontal pressing roll is always positioned on the center between the horizontal receiving rolls and can reliably press the upper surface of the spiral duct.

Further, since the horizontal pressing roll has a coil spring for imparting elasticity, the horizontal pressing roll can be rotated to the pressing position and the retracted position by one-touch opening and closing by simply rotating by holding the horizontal pressing roll or the pressing arm. It is possible to produce the effect that it does not return to the spot and does not rotate.

Since the horizontal pressing roll elastically presses the central portion of the upper surface of the spiral duct, the spiral duct can be stably and smoothly rotated and cut.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a spiral duct is being cut by a cutting device of the present invention.

FIG. 2 is a perspective view of a cutting device.

FIG. 3 is a front view showing a space adjusting operation of a horizontal mounting roll and a rotating operation of a horizontal pressing roll.

FIG. 4 is a partially enlarged sectional view showing a cut state.

FIG. 5 is a diagram illustrating a conventional example.

[Explanation of symbols]

 1 is a base 2a, 2b is a support plate 3a, 3b, 3c, 3d is a meshing gear 4a, 4b, 4c, 4d is a rotating arm 5a, 5b is a horizontal receiving roll 6 is a gap adjusting bar 7 is a square cylinder 7a is a stopper Knob 8 is hook hole 9 is scale 10 Hayagura 11 is moving body 11a, 11b is side plate 12a, 12b is presser arm 13 is presser roll 14 is fixing knob 15a, 15b is coil spring 16a, 16b is stop shaft 17 is a rotary cutter blade mechanism 17a is a cutter blade 17b is a covering cover 17c is a cylindrical portion 18 is a parallel crank mechanism 18a is a parallel crank mechanism lever with an extension 19 is a fulcrum 20 is an operating lever 21 is a ratchet mechanism 21a is an operating pin 22 is an alignment line 23 is a hose 24 is an auxiliary roll S is a spiral duct M is a mark indicating a cutting position

Claims (1)

[Scope of utility model registration request] 1. A pair of front and rear rotating arms extending upward in a bowl shape with a meshing gear at the lower end as a fulcrum, and tensions provided between the upper ends of the front and rear rotating arms and interlocking adjustment with the rotating arms. A left and right horizontal receiving rolls which are opened and closed, a fulcrum for rotation capable of moving up and down on one outer side of the horizontal receiving rolls, and a coil spring for imparting elasticity, and have a curved shape extending upward. The two front and rear presser arms and a one-touch opening / closing type which is stretched between the upper ends of the presser arms and rotates with the presser arms with the elastic force of the coil spring at the center and the retracted position between the horizontal receiving rolls. A presser roll,
A spiral duct cutting device, characterized in that a rotary cutter blade mechanism is provided so as to move up and down in the lower middle of the rotating arm group.