JPH06254718A - Scraper for large-diameter resin tube - Google Patents

Abstract

PURPOSE:To provide a scraper with a blade for a large-diameter resin tube surely biting the tube and generating no scraping irregularities and no residual cuts even when the tube is not a complete round or the thickness is not uniform by forming a clearance section on the lower face of the blade and in front of the tip not to be kept in contact the outer periphery of the tube. CONSTITUTION:The thickness of the opening tip of a resin tube A is clamped by capstan rollers 3, 31 and a roller 10, the capstan rollers 3, 3a are driven by a motor, and the surface B is peeled by a blade 27 while a main body 1 is revolved. A drive screw 18 is rotated by a handle, and a blade holder is moved along a capstan 2 by the action of a feed screw 19. The surface B is spirally peeled by the actions of the movement and revolution, a clearance section 30 is formed in front of the tip 27' of the blade 27, and the blade 27 surely bites into the tube A even when the thickness is not uniform.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scraper for peeling the surface of a large diameter resin pipe.

[0002]

2. Description of the Related Art It is necessary to thinly peel off the surface of a resin pipe when piping the resin pipe or attaching valves or instruments to the resin pipe. As this scraper (cutter) for peeling, the one disclosed in Japanese Utility Model Publication No. 2-10590 is known.

[0003]

However, the above-mentioned known scraper is effective for a small-diameter pipe, but for example, when the pipe has a large-diameter pipe having a diameter of 30 cm or more, the pipe makes one round and the cut line is clean. It is inconvenient to remove it.

Therefore, the inventor of the present application sandwiches the tip of the pipe with a capstan roller and a free-rolling roller, and uses the capstan roller having a groove on the outer periphery as a driving wheel to revolve a scraper along the outer periphery of the pipe and revolve it. A scraper has been proposed in which the blade is fed while the pipe is being scraped to remove the surface of the pipe on a spiral (Japanese Patent Application No. 4-13823).
No. 8).

However, in the case of this scraper, there is no problem when the pipe is a perfect circle and the wall thickness is uniform, but in many cases it is not a perfect circle or the wall thickness is not constant. . Therefore, when the scraper is revolved, a force that tends to tilt in the rotation direction acts on the scraper, and the blade tip portion exceeds the limit of the amount of deflection of the leaf spring for pressing against the outer peripheral surface of the pipe, There is a problem that it slightly rises from the outer surface of the. As a result, the cutting edge of the blade deviates from the center axis of the pipe, and uneven cutting occurs, and an uncut portion is generated.

The present invention has been proposed in view of the above point, and is provided with a blade having a shape that surely bites even when it is not a perfect circle or has a non-uniform wall thickness, and does not cause uneven cutting or uncut residue. The purpose is to propose a scraper for large diameter resin pipes.

[0007]

The structure of the scraper for a large diameter resin pipe according to the present invention is as follows.

A capstan with a capstan roller is mounted horizontally with respect to the scraper body, and below the capstan, parallel to the capstan, and so that the distance between the capstan and the capstan can be adjusted. A roller shaft with an idler roller is arranged, a drive shaft is attached to the capstan, a drive gear is attached to the drive shaft so that the drive shaft can rotate freely, and the drive shaft is parallel to the capstan and from the tip side to the middle. A drive screw provided with a feed screw is attached to the main body, and a feed gear is attached to the drive screw so as to mesh with the drive gear. The feed screw of the drive screw is screwed into a screw hole, and a blade is attached. Together with the capstan from above with a step , A leaf spring is attached to the upper surface, a blade holder is provided at a right angle to the capstan, and a support shaft that is parallel to the capstan and presses the leaf spring of the blade holder from above is attached to the main body. A scraper for large-diameter resin pipes, characterized in that a relief portion is formed on the lower surface of the blade and in front of the blade edge so as not to contact the outer peripheral surface of the pipe.

[0009]

[Function] At the groove of the tip of the target resin pipe, insert the wall thickness between the capstan and the roller shaft, and push up the roller shaft to prevent the capstan roller from slipping against the surface of the resin pipe. Pressure contact. Next, when the drive shaft is driven by connecting the rotary shaft of the hand motor to the drive shaft, the capstan is driven together with this, and the capstan roller rotates. When the capstan roller rotates, the main body revolves around the outer circumference of the pipe, and the blade that cuts into the surface makes a cut in the surface. Then, when the drive gear is manually rotated after the pipe has rotated once, this rotation is transmitted to the drive screw via the feed gear, and the feed screw rotates. When the feed screw rotates, the blade holder meshing with the screw hole is fed, and the blade holder moves in the pipe axis direction (the groove direction) along the drive screw and the capstan. This action causes the blade to make a spiral cut in the surface. When the blade holder comes off the feed screw, the movement stops and the surface peeling ends. The cut amount of the blade is determined by the pressing amount of the leaf spring by the support shaft. In this action, the blade has the relief portion formed in front of the cutting edge thereof, so that the blade escapes from the outer peripheral surface of the tube and secures a sufficient bite. As a result, uneven cutting and uncut residue do not occur.

[0010]

EXAMPLE 1 1 is a scraper body, and the body 1 has capstan rollers 3 and 3a having protrusions on the surface.
Is mounted horizontally, and a drive shaft 4 is coaxially connected to the capstan 2. Reference numeral 5 is a drive gear that is fitted onto the drive shaft 4 so as to freely rotate, and 6 is a motor connecting portion formed at the tip of the drive shaft 4. Reference numeral 7 denotes a left and right support arm attached to the main body 1 by a ring shaft 8 so that the front end side is vertically movable, and two rollers 10 are freely rotatable between the front ends of the support arm 7. The attached roller shaft 9 is rotatably attached by a holder 11. 11 'is a holder shaft.
It should be noted that the roller shaft 9 is parallel to the capstan 2 in the upper and lower directions, and is provided with an interval that allows the wall thickness of the tube to freely enter, and has a generally U-shaped appearance when viewed from the side.

Reference numeral 12 denotes a screw hole 1 of the main body 1 in which the screw portion 1
4 is a knob for adjusting the distance between the capstan 2 and the roller shaft 9 by screwing the tip 4 into contact with the contact portion 16 of the support arm 7. 17 is a roller holder, 1
8 is a drive screw with a feed screw 19 rotatably attached to the main body 1 so as to be parallel to the capstan 2, and a feed gear 20 fixed to the drive screw 18 is attached to the drive gear 5. It is in mesh. The feed screw 19 is cut off in the middle, and a coil spring 21 is externally mounted on the tip of the feed screw 19.

A blade holder 22 is engaged with the capstan 2 from above via a step portion 24, with a screw hole 23 screwed into the feed screw 19 of the drive screw 18 as a fulcrum. A leaf spring attached to the upper surface of the blade holder 22 is used.
Are pressed from above by a support shaft 26 mounted on the capstan 2 so as to be parallel to the main body 1.

Reference numeral 27 is a blade attached to the lower surface of the blade holder 22, and the orientation of the blade 27 is perpendicular to the capstan 2 (pipe axis direction). or,
An escape portion 30 is formed in front of the cutting edge 27 'of the blade 27 (on the side in the rotational direction). 28 is a blade pressing screw, and 29 is a handle attached to the drive gear 5. FIG. 5 shows an example of work using the scraper described above. When the groove thickness of the resin pipe A is inserted between the capstan 2 and the roller shaft 9 and the knob 12 is tightened, the support arm 8 causes the ring shaft 8 to move. It rotates clockwise (FIG. 1) as a center, and as a result, the roller shaft 9 is horizontally pressed against the inner surface of the resin pipe A by the rotating action about the holder shaft 11 '. By this action, the capstan rollers 3, 3a of the capstan 2 bite into the surface B and the frictional force is increased. At the same time, the blade 27 bites into the surface B. After the scraper is set on the resin pipe A in this manner, the rotary shaft of the hand motor (not shown) is fitted into the motor connecting portion 7 of the capstan 2 to drive the capstan 2, and the capstan roller 3 3a runs along the outer peripheral surface B of the resin pipe A, and the main body 1 revolves around the outer periphery of the resin pipe A. Due to this action, the blade 27 separates the surface B of the pipe A along the circle, and even if the pipe A is not a perfect circle or has an uneven thickness, there is a relief portion 30, so that the biting is surely performed. It does not cause uneven cutting or uncut residue. After one rotation, while still driving the capstan 2, rotate the handle 29 little by little to drive the drive gear 5
When the gear is rotated, the feed gear 20 meshed with it
Rotates, and the drive screw 18 rotates. As a result, the feed screw 19 and the screw hole 23 of the blade holder 22.
By this action, the blade holder 22 moves to the right (FIG. 1), and the blade 27 spirally separates the surface B by the revolution of the main body 1 and the moving action of the blade holder 22 (blade 27). FIG. 6 shows the state of peeling in a spiral shape, and C is a capstan impression. After being peeled off in a spiral shape, the blade holder 22 is disengaged from the feed screw 23 and further movement is stopped. Since the coil spring 21 pushes the blade holder 22 back to the feed screw 23 side, when the handle 29 is rotated in the reverse direction, the feed screw 19 and the screw hole 23 are engaged again, and it can be returned to the original position by the reverse feed again.

[0014]

The effects of the present invention are as follows.

A. By sandwiching the groove thickness of the resin pipe between the capstan roller and the roller, and rotating the capstan roller with a hand motor, the resin pipe can be made to go around while peeling the surface with a blade. Therefore, in a large-diameter pipe, the peeling work can be performed easily and quickly.

B. By rotating the drive gear with the handle and transmitting this rotation with the feed gear → drive screw (feed screw), the blade holder (blade) is moved along the tube axis, and the surface is rotated by the revolution of the body. Can be peeled in a spiral shape.

C. By attaching a leaf spring to the blade holder and pressing the leaf spring with the support shaft, it is possible to surely separate the blade while adjusting the biting amount of the blade.

D. Since the relief portion is formed in front of the blade tip of the blade, even if the pipe is not a perfect circle or has an uneven wall thickness, it certainly bites into the pipe, and no uneven cutting or uncut residue occurs.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a scraper according to the present invention.

FIG. 2 is a plan view showing a capstan and a drive screw portion.

FIG. 3 is a front view of the scraper seen from the tip side.

FIG. 4 is a front view of the scraper as seen from the front side.

FIG. 5 is a perspective view showing a state in which a scraper is attached to a resin pipe.

FIG. 6 is a perspective view of a state where the surface is spirally peeled off.

FIG. 7 is an explanatory view of the structure and operation of a blade holder portion.

FIG. 8 is an explanatory diagram of a blade.

[Explanation of symbols]

 1 Main Body 2 Capstan 3, 3a Capstan Roller 4 Drive Axis 5 Drive Gear 6 Support Arm 9 Roller Axis 10 Roller 18 Drive Screw 19 Feed Screw 20 Feed Gear 22 Blade Gear 25 Plate Spring 26 Support Axis 27 Blade 27 'Blade Edge 30' Escape part A Resin tube B Surface

Claims (1)

[Claims] 1. A capstan to which a capstan roller is mounted is mounted horizontally with respect to the scraper body, and below the capstan, parallel to the capstan, and a gap between the capstan and the capstan can be adjusted. Thus, the roller shaft with the idler roller is arranged, the drive shaft is attached to the capstan, the drive gear is attached to the drive shaft so as to freely rotate, and the drive shaft is parallel to the capstan and from the tip side. A drive screw provided with a feed screw up to the middle is attached to the main body, and a feed gear is attached to this drive screw to mesh with the drive gear, and the feed screw of the drive screw is screwed with a screw hole, and a blade Attaching and engaging from above with a step on the capstan Then, a leaf spring is attached to the upper surface, a blade holder arranged at right angles to the capstan is provided, and a support shaft that is parallel to the capstan and presses the leaf spring of the blade holder from above is attached to the main body. In the scraper for a large diameter resin pipe, the scraper for a large diameter resin pipe is characterized in that a relief portion is formed on the lower surface of the blade and in front of the blade edge so as not to contact the outer peripheral surface of the pipe.