JPH06254717A - Scraper for large-diameter resin tube - Google Patents

Abstract

PURPOSE:To provide a scraper for a large-diameter resin tube not removed even when the end face of the tube is not perpendicular or the tip side of the tube is tapered in the outer diameter direction by forming the outer diameter of a capstan roller located at the tip side of the resin tube larger than the outer diameter of a capstan roller located inside it. CONSTITUTION:The opening tip of a resin tube A is clamped by capstan rollers 3, 3a and a roller 10, the capstan rollers 3, 3a are driven by a motor, and the surface B is peeled by a blade while a main body 1 is revolved. A drive screw 18 is rotated by a handle 29, and a blade holder 22 is moved along a capstan 2 by the action of a feed screw 19. The surface is spirally peeled by the actions of the movement and revolution, the outer diameter of the roller 3 on the end face side of the tube A is set larger than the outer diameter of the inside roller 3a, a scraper is revolved along the outer periphery of the resin tube A by the drive of the motor, and directivity is invariably applied to the scraper into contact with the end face of the tube.

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 end face of the pipe is cut at a right angle, but in many cases, it is not cut at a right angle. Further, as shown in FIG. 7, a taper D in the radial direction may be provided on the tip side of the pipe A. When the scraper is applied to a pipe of such a shape, the capstan roller revolves around the circumference, and the scraper gradually moves away from the pipe during the revolution, and finally comes off the end face side. There's a problem.

The present invention is proposed in view of the above point, and a scraper for a large-diameter resin pipe which does not come off even if the end face of the pipe is not at a right angle or the tip end side of the pipe is tapered in the radial direction. The purpose is to propose.

[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. In the scraper for large-diameter resin pipes, the outer diameter of the capstan roller located on the tip side of the resin pipe is formed to be larger than the outer diameter of the capstan roller located inside the scraper for large-diameter resin pipes. .

[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 driving capstan roller for revolving the main body (scraper) has a larger outer diameter on the tip surface side (groove side) of the tube than the inner outer diameter. Revolves around the outer circumference of the pipe. As a result, it does not come off.

[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. The outer diameter of the capstan roller located on the outer surface side of the end is the inner side of the capstan roller 3a.
Is larger than the outer diameter of. 5 is a drive gear that is fitted onto the drive shaft 4 so as to freely rotate, and 6 is a drive shaft 4.
Is a motor connecting portion formed at the tip of. 7 is the main body 1
On the other hand, the left and right support arms are attached by a ring shaft 8 so that the front end can be moved up and down, and two rollers 10 are provided between the front ends of the support arm 7.
A roller shaft 9 rotatably attached to 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 blade holder 22, and the orientation of this blade 27 is perpendicular to the capstan 2 (pipe axis 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 performed 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 rings. It rotates clockwise about the shaft 8 (FIG. 1), 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 way, the rotary shaft of the hand motor (not shown) is fitted to the motor connecting portion 7 of the capstan 2 and the capstan 2 is driven. 3a runs along the outer peripheral surface B of the resin pipe A, and the outer diameter of the outer capstan roller 3 is larger than that of the inner capstan roller 3a. Revolve around the outer circumference of. By this action, the blade 27 peels the surface B along the periphery. After one rotation,
When the handle 29 is rotated little by little while the capstan 2 is driven and the drive gear 5 is rotated, the feed gear 20 meshed with this is rotated and the drive screw 18 is rotated. As a result, the blade holder 22 moves to the right (FIG. 1) by the action of the feed screw 19 and the screw hole 23 of the blade holder 22, and the blade revolves around the main body 1 and the blade holder 22 (blade 27) moves. 27 peels the surface B spirally. 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 toward the feed screw 23, when the handle 29 is rotated in the reverse direction,
The feed screw 19 and the screw hole 23 are again engaged with each other, and it is possible to return to the original position by reverse feeding again.

[0015]

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. The main body (scraper) revolves in the direction of contact with the end face of the pipe, so it does not come off during revolution.

[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 diagram of an example in which the tip end side of the pipe has a taper in the radial direction.

[Explanation of symbols]

 1 main body 2 capstan 3, 3a capstan roller 4 drive shaft 5 drive gear 6 support arm 9 roller shaft 10 roller 18 drive screw 19 feed screw 20 feed gear 22 blade gear 25 leaf spring 26 support shaft 27 blade 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 large-diameter resin pipe scraper, the outer diameter of the capstan roller located on the tip side of the resin pipe is formed to be larger than the outer diameter of the capstan roller located inside this. scraper.