JPH07266122A - Pipe cutter - Google Patents

Abstract

PURPOSE:To provide a pipe cutter which is optimum for cutting a pipe, especially a pipe for an air conditioner, by which a pipe can be cut finely without generating a burr on its cut end. CONSTITUTION:A head 14 having a U-shaped pipe passing hole 15 is supported on a frame 3 by a shaft, a rotary board 27 having a U-shaped pipe passing hole 30 is provided on a support shaft 18 of the head 14 in such a manner as to freely rotate, and a cutter 19 and a roller 21 are provided opposite to each other in the head 14 in such a manner as to freely slide toward the inside of the pipe passing hole 15. Projections projected from the cutter 19 and the roller 21 are engaged with a cam groove 28 provided on the rotary board 27, an output shaft 10 of a motor 5 is connected to the head 14 through a rotational driving means 8, and a brake part 36 provided on the frame 3 is connected to the rotary board 27 through a rotation control means 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable pipe cutter device for cutting a pipe having a relatively small diameter such as a pipe for an air conditioner.

[0002]

2. Description of the Related Art A conventional portable pipe cutter is of a manual type, and as shown in FIG.
A C-shaped frame 52 is rotatably fitted in an intermediate portion of a handle 51 having 0, a cutter 53 is provided at the tip of the frame 52, and a slider 54 is moved along the frame 52 toward the cutter 53 by rotation of a screw portion of the handle. The slider 54 is provided so as to slide back and forth, and the slider 54 is provided with a pair of rollers 55 that face the cutter 53. When cutting the pipe, the pipe is sandwiched between the cutter and the roller, and the roller is pressed against the pipe while the handle is being pressed. It is cut by rotating.

[0003]

In the above manual method, a delicate technique is required to press the pipe to be cut by the cutter and the roller so as to pinch it. If it is too strong, the cutting surface bends inward. If it is weak, it takes a long time to cut.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a pipe cutter device that can be electrically cut automatically and cleanly without excess or deficiency of pressing force.

[0005]

According to a solution of the present invention, a head is rotatably supported by a frame having an opening, and a U-shaped member is provided between the head and a supporting shaft of the head from the outer circumference toward the center. None Provided with a pipe insertion hole facing the opening of the frame in communication with each other, a cutter and a roller are provided inside the head so as to be slidable toward the inside of the pipe insertion hole so as to be slidable toward the support shaft of the head. , A rotary disk having a U-shaped pipe insertion hole that communicates with the pipe insertion hole of the head is rotatably provided, and a motor for forward / reverse rotation is connected to the head through a rotation drive means to rotate the brake part on the rotary disk. And a pair of cam grooves which are connected to each other via a restraining means and which form an arc toward the inner peripheral portion from the outer peripheral portion of the rotary disk symmetrically,
Corresponding to each attachment site of the cutter and roller of the head, a guide hole from the outer periphery of the head to the center is provided.
Each of the projecting members protruding from the cutter and the roller is engaged with the cam groove through the guide holes facing each other.

The rotation driving means is provided with a rotation main driving gear on an output shaft of a motor for forward and reverse rotation, a rotation driven gear on a support shaft of a head, and a pair of rotation intermediate gears are meshed with both gears. The U-shaped pipe insertion hole, which is connected to the rotary driven gear and communicates with the pipe insertion hole of the head, is provided.

The rotation suppressing means fixes the braking main gear to the rotating disk, provides the braking slave gear on the braking shaft of the brake portion provided on the frame, and provides a pair of braking intermediate gears on both gears for both gears. It is characterized in that the braking main gear is provided with a pipe insertion hole communicating with the pipe insertion hole of the rotating disk, which is interposed in a meshed state.

The detection board having a U-shaped pipe insertion hole formed in the support shaft of the head is placed in such a state that the U-shaped pipe insertion hole is aligned with the pipe insertion hole provided in the head support shaft. It is provided in the vicinity of the opening of the frame, and is incorporated in the reverse rotation circuit of the motor, and a sensor for detecting the corner of the pipe insertion hole of the detection board and issuing a command to stop the reverse rotation drive is characterized. To do.

Another solution of the present invention is that the rotation driving side and the rotation suppressing side are provided in reverse, and the feature thereof is that the head is rotatably supported by a frame having an opening, The support shaft of the head is provided with a pipe insertion hole which is U-shaped toward the center from the outer periphery and faces the opening of the frame in a communicating state, and the cutter and the roller are opposed to each other in the head. A motor that is slidably provided in the insertion hole and has a U-shaped pipe insertion hole that is in communication with the head pipe insertion hole on the support shaft of the head, is rotatably provided, and is a motor that rotates forward and backward on the rotation plate. Is connected via a rotation driving means, a brake portion is connected to the head via a rotation suppressing means, and a pair of cam grooves symmetrically forming an arc from the outer peripheral portion to the inner peripheral portion are provided on the rotary disk. , Head cutter and low A guide hole extending from the outer periphery of the head toward the center is provided corresponding to each mounting portion of the head, and each protrusion protruding from the cutter and the roller is engaged with the cam groove through the opposing guide hole, A stopper is provided in the vicinity of the opening so as to be biased by a spring in a direction to be inserted into a bearing hole for receiving the head support shaft of the frame, and the head support shaft is cut out from the pipe insertion hole to engage the toe of the stopper. There is a notch.

The rotary drive means is provided with a rotary driving gear on an output shaft of a forward-reverse rotation motor, a first one-way clutch and a slip ring interposed front and rear, and a rotary driven gear on a rotary disk. In addition, a pair of rotary intermediate gears are interposed so as to mesh with both gears, and the rotary driven gear is also provided with a U-shaped pipe insertion hole that communicates with the pipe insertion hole of the rotary disk. And

The rotation suppressing means includes a braking main gear on the head support shaft, a braking slave gear rotatably on an output shaft from a forward-reverse rotation motor, and a pair of braking intermediate gears are provided between the two gears. The brake main gear is provided with a pipe insertion hole communicating with the pipe insertion hole of the head support shaft, and the braking sub gear is formed of a brake drum and a brake shoe via a second one-way clutch. It is characterized by comprising.

[0012]

[Function] When the motor is driven in the normal direction, the head rotates in the normal direction, and the rollers and the protrusions provided on the cutter are inserted into the guide holes and engage with the cam grooves of the rotary disk. Both are driven to rotate, but since the rotating disc is equipped with a brake unit via the rotation suppressing means, the rotation speed of the rotating disc becomes slower than the rotation of the head due to the suppressing force, and the roller is rotated via each protrusion. Send the cutter toward the center of the head. If the motor is reversed, the roller and cutter will retract into the head. Therefore, if the motor is driven in the normal direction by inserting the pipe to be cut through the pipe insertion hole, the roller and the cutter circulate around the outer periphery of the pipe while being pressed against the pipe, and sequentially cut and cut. By reversing the motor after cutting, the roller and cutter are retracted, and the pipe cutter can be removed from the pipe.

Since the pipe insertion hole is cut out in a U-shape, the pipe to be cut can be easily inserted, and the pipe can be cut by inserting it in the middle portion of the pipe that has already been piped.

U-shaped pipe insertion holes are provided in each of the main and slave gears of the rotation driving means and the rotation suppressing means, but a pair of intermediate gears having different phases are interposed between the master and slave gears.
Even if the gear has a U-shaped pipe insertion hole, the rotational force can be transmitted without interruption.

When the pipe is cut and then reversed, if a sensor is provided, the opening of the frame and the pipe insertion holes can be aligned and stopped.

According to the means in which the rotation driving side and the rotation suppressing side are provided in reverse, the rotating disk is rotated by the forward rotation, and the head is rotated through the protrusions of the cutter and the roller.
Since the restraining force of the brake unit is applied to the head, the cutter and the roller press the pipes to be sequentially cut to cut.

When reversing, the rotational force of the output shaft starts reversing the turntable via the slip ring, and the head of the head reverses at the same time as the protrusion of the cutter and roller reaches the end of the cam groove. Since the second one-way clutch disconnects the brake from the brake part, the pipe insertion hole of the turntable, the pipe insertion hole of the head, and the pipe insertion hole of the head support shaft continue to rotate in reverse with each other. Reverse rotation of the turntable and head is stopped in the state where the stopper is engaged with the notch provided in each and the pipe insertion holes match the opening of the frame, and even if the motor is reversely driven, its output shaft idles. It is a thing.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A portable pipe cutter according to the present invention will be specifically described with reference to first and second embodiments. In the first embodiment, as shown in FIGS. 1 to 14, a rechargeable battery 2 is provided in a handle 1 and a hollow frame 3 for supporting a main body of a cutter device for cutting a pipe is provided on the handle 1. Stuck,
The DC motor 5 with the reducer 4 provided on the frame 3
It is driven by a forward / reverse changeover switch 6 and a start switch 7 provided on the handle 1. The start switch 7 is locked at the neutral position of the forward / reverse changeover switch 6. Further, for assembling, the frame 3 is formed of a main body 3a and a sub body 3b, which are integrated with each other by screws.

As shown in FIGS. 1 to 4, a disk-shaped head 14 is rotatably provided on a frame 3 via a support shaft 18 projecting therefrom, and a rotary disk 27 is attached to the support shaft 18. Is rotatably fitted, the head 14 and the output shaft 10 of the motor 5 are connected via the rotation driving means 8, and the turntable 27 and the brake portion 36 are connected via the rotation suppressing means 9. .

As shown in FIGS. 4 to 6, the rotary driving means 8 projects the output shaft 10 from the motor 5 into the frame 3 and fixes the rotary driving gear 11 to the tip end of the output driving shaft 11. A pair of rotary intermediate gears 12, 12 meshing with different phases, and a rotary driven gear 13 meshing with both rotary intermediate gears 12, 12 for supporting shaft 18 of head 14.
The rotary driven gear 13 is integrally fixed to the front end surface of the support shaft 18 of the head 14 with a bolt in assembling.

As shown in FIGS. 4 and 8, the head 14 and the rotary driven gear 13 fixed to the head 14 are arranged so that the pipe insertion holes 15 and 16 cut out in a U-shape from the outer periphery toward the center are aligned with each other. The head support shaft 18 is also provided with a pipe insertion hole 18a. Also turntable 2
7 also has a pipe insertion hole 30.

Further, the frame 3 is provided with an opening 17 which coincides with the outer peripheral side opening of the pipe insertion hole 15 provided in the rotary driven gear 13, and the pipe to be cut through this opening 17 is attached to the head 14 And the rotary driven gear 13 and the like are inserted into the respective pipe insertion holes 15, 16, 30.

Further, as shown in FIGS. 7 and 8, in the head 14, a cutter block 20 having a circular cutter 19 and a roller block 22 having a pair of rollers 21 and 21 are provided in the head 14. Provided pipe insertion hole 1
It is built in so as to be slidable toward the central portion of 6. On the surface of the head 14 facing the rotary driven gear 13, a cutter 19 and a roller 21 are installed in a portion where the cutter 19 is provided.
And guide holes 23, 24 along the sliding direction of the roller 21
The protrusions 25 and 26 projecting from the blocks 20 and 22 are inserted into the guide holes 23 and 24 facing each other.

Next, as shown in FIGS. 4, 9 and 10, the turntable 27 rotatably fitted to the support shaft 18 of the head 14 has a pair of cam grooves 28 and 29 on its plate surface. It is provided symmetrically around the center point of 27,
It is formed so as to draw an arc from the outer peripheral portion of the rotating disk toward the inner peripheral portion. The guide holes 2 are projected into the cam grooves 28 and 29 from the blocks 20 and 22, respectively.
The protrusions 25 and 26 inserted through the pins 3 and 24 are engaged with each other. Further, each cam groove 28, 29 is provided on
The pipe insertion hole 30 provided in the
0 and the roller block 22 are formed so as to coincide with the pipe insertion hole 15 of the head 14 when retracted into the head 14.

Accordingly, by temporarily fixing the head 14 and rotating the turntable 27 to one side, the cutter 19 and the roller 21 are simultaneously moved into the pipe insertion hole 16 by the cam grooves 28 and 29 and the guide holes 23 and 24. When the sliding table 27 slides and the turntable 27 rotates in the opposite direction to the above, the cutter 19 and the roller 21 simultaneously retract into the head 14.

As described above, the cutter 19 and the roller 21
In order to carry out the operation of appearing and disappearing with the rotation of the head 14, it is possible to perform it by making the rotational speeds of the head 14 and the turntable 27 different.

In order to obtain the above-mentioned action, a braking force is applied to the rotary disc 27 to reduce the rotational speed below that of the head 14. The brake part 36 is connected to the rotary disc 27 via the rotation suppressing means 9. To do.

As shown in FIG. 4, the brake portion 36 has a braking shaft 34 rotatably fitted in a bearing hole 33 formed at the tip of the output shaft 10 from the motor 5 and fixed to the end portion of the braking shaft 34. The plate 37 is rotatably fitted, but the fixed plate 37 is fixed to the frame 3 by a support plate 38 so that the plate 37 cannot rotate.
4, the flange 39 is fixedly attached, and the flange 39 and the fixed plate 37 are attached.
Brake shoe 40 made of rubber or soft synthetic resin between
The set collar 41 for holding the state where the brake shoe 40 is pressed against the fixed plate 37 is fitted to the braking shaft 34 with the interposition of. If the set collar 41 is of a screw type, the restraining force can be changed freely.

As shown in FIG. 9, the rotation suppressing means 9 has a braking main gear 31 on the side of the rotating disk 27 facing the frame 3.
Is integrally provided in parallel with the turntable, and a pair of braking intermediate gears 32, 32 meshing with the braking main gear 31 in different phases.
And the rotating intermediate gears 12, 12 provided in the frame 3.
Is provided rotatably coaxially with the support shaft of the above, and a braking slave gear 35 that meshes with both of the braking intermediate gears 32, 32 is provided on the braking shaft 34 of the brake portion 36. The braking main gear 3
1 also has a pipe insertion hole 31a in communication with the pipe insertion hole 30 of the turntable 27.

It should be noted that the above-described example is portable, and a U-shaped notched pipe is inserted so that it is advantageous to cut in the middle of the pipe for repairing the pipe that has already been piped. Although it is provided with holes, it is not necessary to form the pipe in a U shape as long as it is only for cutting a pipe that is not installed and is to be newly installed, and the head and the rotary disk and the gears attached to them are not necessary. It is sufficient to open a circular through hole in. Further, as long as it has a circular through hole, one intermediate gear may be provided, or it is not necessary and the gear may be directly connected to the gear of the output shaft. However, it is the most preferable if it is provided with the U-shaped notched pipe insertion hole as described above, since it can be applied regardless of whether the pipe is already installed or newly installed.

By the way, when a U-shaped notched pipe insertion hole is provided, the cutter 19 is driven by forward rotation.
And the roller 21 sequentially project into the pipe insertion hole to cut the pipe, and the motor 5 is reversed to retract the cutter 19 and the roller 21 into the head 14, and the pipe insertion hole 15 of the head 14 and the turntable 27. Pipe insertion hole 1
6 does match, but the pipe insertion hole 15 of the head 14 and the opening 17 of the frame 3 do not necessarily match, and it is difficult to pull out the main body equipped with this device from the cut pipe, and sometimes it cannot be pulled out. In some cases. In order to eliminate this, when the motor 5 is reversed, the head 1
It is preferable to equip the pipe insertion hole 15 of No. 4 and the opening 17 of the frame 3 with a control means for automatically stopping.

As shown in the flow chart of FIG. 11 and the circuit diagram of the concrete example of FIG. 12, the control means has a changeover switch 6 for instructing forward rotation and reverse rotation to the main body as described above.
Therefore, the motor 5 is normally driven while the switch 5 is manually switched to the normal rotation side and the start switch 7 is manually pushed, but the motor 5 is stopped by releasing the hand from the start switch 7. . On the other hand, when the changeover switch 6 is switched to the reverse rotation side and the start switch 7 is pushed, the motor 5 is driven in reverse rotation.
The position detection sensor detects a state in which the opening 5 of the frame 3 and the opening 17 of the frame 3 match each other, and the motor 5 is stopped by the detection signal.

Various known means may be adopted for the above-mentioned position detection. For example, as shown in FIG.
A sensor 42 is provided in a circuit connecting the motor 5 and the motor 5, a pair of a contacts A1 and A2 of the relay 43 are interposed in the forward rotation circuit 44 below the relay 43, and b contacts B1 and B2 of the relay 43 are provided in the reverse rotation circuit 45. In order to intervene and ensure the position detection, a resistor 46 that reduces the rotation speed of the motor 5 is provided.

As shown in FIGS. 13 and 14, an example of incorporating the sensor 42 by the microswitch into the main body of the device is shown in FIGS. 13 and 14 on the side opposite to the head 14 of the rotary driven gear 13, that is, on the rear side of the rotary driven gear 13. A detection plate 47 made of a disk is fixed, and a pipe insertion hole 48 similar to the pipe insertion hole 16 of the rotary driven gear 13 is provided in the detection plate 47 so as to be aligned with the pipe insertion hole 16 of the rotary driven gear 13. A main body of a sensor 42 by a micro switch is fixed near the opening portion 17 of 14, and its contactor is provided so as to be pressed against the outer circumference of the detection board 47. Therefore, the detection board 47 is shown in FIG.
The reverse rotation is performed while the reverse rotation circuit 45 is ON while the contact is pressed against the outer circumference of the detection board 47 by reversing in the direction of the arrow 3 and the contact falls into the pipe insertion hole 48. At the same time, the reversing circuit 45 is turned off, and the pipe insertion holes 15, 16, 30, 48 are aligned and stopped when they coincide with the opening 17. It should be noted that if the contact of the sensor 42 by the microswitch is projected into the pipe insertion hole 48 of the detection board 47, there is a drawback that it comes into contact with the pipe to be extracted. There is. On the other hand, both corners of the opening of the pipe insertion hole 48 are divided into a leading side and a trailing side by reverse rotation,
Refers to the trailing corner.

The position detecting sensor 42 is not limited to a micro switch, but may be an optical sensor or a reed switch. It is also possible to detect the number of revolutions with a pulse and detect the position with the pulse.

When the pipe is cut using the apparatus body having the above U-shaped pipe insertion holes, the pipes are fitted through the openings 17 of the frame 3 into the pipe insertion holes 15, 16, 30, 48. When the head 14 is rotated in the normal direction at the same time as the head 14 is rotated in the normal direction, the turntable 27 braked by the brake portion 36 is rotated in the normal direction at a slower speed than the head 14 by inserting the switch 14 into the normal rotation side and pressing the start switch 7. Therefore, the protrusion 2 engaged with the cam grooves 28, 29
Since a force that the cutter 19 and the roller 21 project toward the outer peripheral surface of the pipe acts on the pipes 5 and 26, the cutter 19 and the roller 21 are in pressure contact with the outer peripheral surface of the pipe, and a deep cut is made sequentially.

After cutting the pipe as described above, the changeover switch 6 is switched to the reverse rotation side and the start switch 7 is pressed again, whereby the head 14 is reversely rotated. Evacuated,
The reverse rotation is stopped at the same time when the detection sensor 42, specifically, the micro switch, falls into the notch 49 provided in the pipe insertion hole 48 of the detection board 47, and at the same time, the reverse rotation drive is stopped.
5, 16, 30, and 48 match each other and also match the opening 17 of the frame 3, and the device body can be pulled out from the pipe as it is.

Next, a second embodiment will be described with reference to FIGS. 15 to 20. In this example, when the motor 5 is rotated in the forward direction to cut the pipe, and then the changeover switch 6 is switched to perform the reverse rotation drive, Each pipe insertion hole 15, 16, 30, 4
It is configured such that the pipes 8 are kept in a matched state even if the pipes 8 match each other and the motor 5 continues to rotate thereafter.

The second embodiment is almost the same as the construction of the first embodiment, but a means is provided for cutting the pipe and then reversing it so that the pipe insertion holes 15, 16, 30, 48 are aligned with each other. Although the above-mentioned example is configured electrically, this example is configured mechanically, and the rotation driving means 8 and the rotation suppressing means 9 provided on the output shaft 10 of the motor 5 are provided in the first embodiment. It is provided in reverse. That is, as shown in FIG. 15 in comparison with FIG. 4 of the first embodiment,
The gear train on the tip end side of the output shaft 10 serves as the rotation driving means 8, and the gear train near the motor 5 serves as the rotation suppressing means 9. In the second embodiment, the same members as those in the first embodiment will be described with the same reference numerals.

As shown in FIGS. 15 and 16, the rotation driving gear 11 of the rotation driving means 8 is transmitted to the output shaft 10 of the motor 5 at the time of forward rotation, and at the time of reverse rotation, rotation is not transmitted. The one-way clutch 56 and the slip ring 57 are fitted in the front and rear to fit the rotary drive gear 11
Similarly to the first embodiment, the rotary intermediate gears 12, 12 and the rotary driven gear 13 are meshed with each other. The rotary driven gear 13 is loosely fitted to the outer periphery of the support shaft 18 of the head 14 and is integrated with the rotary disk 27 having a pair of cam grooves 28 and 29, as in the first embodiment.

As shown in FIGS. 15 and 17, the rotation suppressing means 9 loosely fits a braking slave gear 35 having a collar 58 on the output shaft 10, and the braking slave gear 35 has a braking intermediate gear 32 ,.
A braking main gear 31 is meshed with the braking main gear 31 via 32, and the braking main gear 31 is integrated with the head 14 as in the first embodiment. The rotation is transmitted to the outer periphery of the collar 58 of the braking follower gear 35 at the time of forward rotation and is not transmitted at the time of reverse rotation.
The brake drum 60 is fitted through the one-way clutch 59, and the brake shoe 40 is pressed against the outer peripheral surface of the brake drum 60 by the spring 62 with the adjusting screw 61.

Incidentally, as shown in FIG. 18, a cover 63 for covering the rotary intermediate gears 12, 12 of the rotary drive means 8,
A bearing 64 for receiving the tip of the output shaft 10 is provided, and a support plate 38 for receiving the adjusting screw 61 is attached to the rear surface of the frame 3. Further, the cutter block 20 and the roller block 22 are provided with knobs 65 and 66, respectively, and a crankshaft (not shown) is provided on the knobs 65 and 66. By rotating the knobs 65 and 66, the cutter 19 and the roller 21 are rotated. Can be adjusted back and forth, depending on the thickness of the pipe to be cut.

Further, FIG. 19 is a view of the motor 5 as seen from the protruding side, in which the pipe insertion hole 18 is formed on the side surface of the support shaft 18.
The cutout portion 67 cut out from a is provided, and the frame 3 is provided with a stopper 68 that engages with the cutout portion 67. The stopper 68 is a claw piece pivotally supported by the frame 3,
The toes are attached to the cutout portion 67 so as to be engaged by the spring force, and when the stopper 68 is engaged with the cutout portion 67, the pipe insertion hole 16 is aligned with the opening 17 of the frame 3.

When the pipe of the second embodiment is normally rotated to cut the pipe and then reversely rotates, the rotational force is not transmitted by the first one-way clutch 56 of the rotary drive means 8, but the rotary drive means 8 is rotated by the slip ring 57. Since the rotation is reversed, as shown in FIG. 20, the rotary driven gear 13 and the rotary disk 2 are rotated.
7 reverses. At that time, since the protrusions 25 and 26 projecting from the head 14 are engaged with the cam grooves 28 and 29 provided on the turntable 27, the cam groove 2 is rotated according to the reverse rotation of the turntable 27.
The protrusions 25 and 26 come into contact with the ends of the blades 8 and 29, and the cutter 19
At the same time as the roller 21 retracts into the head 14,
The pipe insertion hole 30 of the turntable 27 coincides with the pipe insertion hole 15 of the head 14, and the head 14 and the braking slave gear 31 fixed to the head 14 also start reverse rotation, and the pipe insertion hole 31a of the braking main gear 31 becomes the frame. 3 simultaneously with the opening 17 of the support shaft 18, the stopper 68 is provided with the notch 67 of the support shaft 18.
Therefore, even if the motor 5 is continuously driven in the reverse direction thereafter, the output shaft 10 only idles, and the rotation driving means 8
The rotation to is not transmitted.

Incidentally, the pipe insertion hole 31a of the braking main gear 31
Since the pipe insertion hole 15 of the head 14 and the pipe insertion hole 15 of the head 14 are fixed to each other while maintaining the same phase, the pipe insertion hole 31a of the braking main gear 31 coincides with the opening 17 of the frame 3 and at the same time,
Head 1 that matches the pipe insertion hole 30 of the turntable 27
The pipe insertion hole 15 of No. 4 also matches the opening 17 of the frame 3.

[0046]

According to the pipe cutter device of the present invention,
By rotating the head forward, the cutter and roller provided in the head protrude toward the pipe insertion hole provided in the head, so the cutter and roller are pressed against the outer peripheral surface of the pipe passed through the pipe insertion hole, The cutter sequentially cuts the pipe as it cuts.The pressing force of the cutter against the pipe is due to the suppression pressure by the brake part of the rotating disk, that is, the cutting pressure of the cutter into the pipe is due to human power. Instead, because it is automatically rotated mechanical force, an unreasonable pressing force is not applied to the cut surface, and it is possible to cut neatly without any return.

Further, the head and the rotary driven gear, the rotary disk and the braking main gear are respectively provided with U-shaped notched pipe insertion holes, and the rotary main gear is connected to the rotary driven gear and the braking main gear is connected to the main braking gear. Since a pair of intermediate gears are interposed between the gears with different phases, each gear has a U
Even if you open the V-shaped pipe insertion hole and have missing teeth between them, one of the pair of intermediate gears meshes, so there is no intermittent rotation drive and smooth rotation can be transmitted. You can

Further, if the sensor controls the U-shaped pipe insertion hole provided in the head at the time of reverse rotation so as to stop at the opening of the frame, the pipe is cut and the reverse rotation instruction is given. As a result, the pipe insertion hole of the head and the opening of the frame stop automatically, so the main body of the pipe cutter can be pulled out without interfering with the cut end of the pipe. The cut pipe can be easily pulled out without the need to bend it.

Next, if the head side is connected to the rotation suppressing means and the turntable side is connected to the rotation driving means, an unreasonable pressing force is not applied to the cut surface as in the pipe cutter device having the above-mentioned structure. , It can be cut cleanly without any return, and when it is reversed after cutting, even if the motor is further driven after stopping the rotation by the stopper, the braking by the rotation suppressing means is released Since the rotation is not transmitted to the drive means, the pipe insertion holes are held in a state where they are aligned with the opening of the frame, and the pipe can be reliably removed from the pipe after cutting.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a pipe cutter device according to the present invention.

FIG. 2 is a front view of the same main portion.

FIG. 3 is a rear view of the main part of the same.

FIG. 4 is an enlarged cross-sectional view of the same main part.

FIG. 5 is a front view showing a gear portion of the rotation driving means.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is a front view showing an arrangement of cutters and rollers provided in the head.

FIG. 8 is a rear view of the head.

FIG. 9 is a front view showing a gear portion of rotation suppressing means.

FIG. 10 is a front view of a turntable.

FIG. 11 is a flowchart illustrating a motor control operation.

FIG. 12 is a circuit diagram of an example of driving a motor.

FIG. 13 is a front view showing a mounting state of a sensor.

FIG. 14 is a front view showing a time point when a sensor detects a pipe insertion hole.

FIG. 15 is a sectional view of an essential part showing a second embodiment according to the present invention.

FIG. 16 is a rear view showing the structure of the rotation driving means.

FIG. 17 is a rear view showing the structure of rotation suppressing means.

FIG. 18 is a front view of the second embodiment as viewed from the head side.

FIG. 19 is a rear view of the second embodiment viewed from the motor side.

FIG. 20 is an explanatory diagram showing the operation of the rotation driving means and the rotation suppressing means when the rotation is reversed.

FIG. 21 is a front view showing a conventional pipe cutter.

[Explanation of symbols]

3 frame 5 motor 8 rotation driving means 9 rotation suppressing means 10 output shaft 11 rotary main gear 12 rotary intermediate gear 13 rotary driven gear 14 head 15, 16, 18a, 30, 31a, 48 pipe insertion hole 17 frame opening 18 head Support shaft 19 Cutter 21 Roller 23,24 Guide hole 25,26 Projector 27 Rotating disk 28,29 Cam groove 31 Braking main gear 32 Braking intermediate gear 34 Braking shaft 35 Braking slave gear 36 Braking part 40 Brake shoe 42 Sensor 44 Positive Reversing circuit 45 Reversing circuit 47 Detection board 56 1st one-way clutch 57 Slip ring 59 2nd one-way clutch 60 Brake drum 67 Notch portion 68 Stopper

Claims (7)

[Claims] 1. A frame (3) having an opening (17).
A head (14) is rotatably supported on the
4) and the support shaft (18) of the head are provided with a pipe insertion hole (15, 18a) which is U-shaped from the outer periphery toward the center and faces the opening (17) of the frame. , A cutter (19) and a roller (21) are provided in the head (14) so as to be opposed to each other so as to be slidable toward the pipe insertion hole (15), and a support shaft (18) of the head (14) is provided.
A rotary disk (27) having a U-shaped pipe insertion hole (30) communicating with the pipe insertion hole (15) of the head (14) is rotatably provided on the head (14), and the head (14) has a forward and reverse motor ( 5) is connected via a rotary drive means (8), a brake part (36) is connected to a rotary disk (27) via a rotation suppressing means (9), and the rotary disk (27) is connected from its outer peripheral portion. A pair of cam grooves (28, 29) forming an arc toward the inner peripheral portion are symmetrically provided,
Head (14) cutter (19) and roller (21)
Guide holes (23, 24) extending from the outer periphery of the head (14) toward the center of the head (14) are provided corresponding to the respective attachment sites of the head (14), and the protrusions (2) protruding from the cutter (19) and the roller (21).
5, 26) are engaged with the cam grooves (28, 29) through opposed guide holes (23, 24). 2. The rotation driving means (8) is provided with a rotary driving gear (11) on an output shaft (10) from a motor (5) for forward and reverse rotation, and a rotation driven gear (11) on a support shaft (18) of the head. 13), and a pair of rotating intermediate gears (12, 12) are provided between both gears (11, 13).
3) is engaged with the rotary driven gear (1
3. The pipe cutter device according to claim 1, wherein the U-shaped pipe insertion hole (16) communicating with the pipe insertion hole (15) of the head is provided in 3). 3. The rotation suppressing means (9) fixes a braking main gear (31) to the turntable (27) and attaches the braking main gear (31) to a braking shaft (34) of a brake section (36) provided on the frame (3). A braking sub gear (35) is provided, and a pair of braking intermediate gears (32, 32) are interposed between both gears (31, 35) so as to mesh with both gears (31, 35), and a braking main gear ( The pipe cutter device according to claim 1 or 2, characterized in that the pipe insertion hole (31a) communicating with the pipe insertion hole (30) of the turntable is provided in (31). 4. A detection board (4) having a U-shaped notched pipe insertion hole (48) in a support shaft (18) of the head.
7) is provided with its U-shaped pipe insertion hole (48) aligned with the pipe insertion hole (18a) provided in the support shaft (18) of the head, and in the vicinity of the opening (17) of the frame (3). And a sensor (42) which is incorporated in the reversing circuit (45) of the motor (5) and which detects a corner portion of the pipe insertion hole (48) of the detection board (47) and gives a command to stop the reverse driving. The pipe cutter device according to claim 1, 2, or 3. 5. A frame (3) having an opening (17).
The head (14) is rotatably supported on the head (14).
A pipe insertion hole (15, 30) which is U-shaped from the outer periphery toward the center and faces the opening (17) of the frame and is connected to the support shaft (18) of the head,
Inside the head (14), the cutter (19) and roller (2
1) are provided so as to be opposed to each other so as to be slidable into the pipe insertion hole (15), and a U-shaped pipe insertion which communicates with the head support shaft (18) with the pipe insertion hole (15) of the head. A turntable (27) having a hole (30) is rotatably provided, and a forward and reverse motor (5) is connected to the turntable (27) through a rotation drive means (8), and the head (14) is braked. The part (36) is connected via a rotation suppressing means (9), and the turntable (27) is symmetrically provided with a pair of cam grooves (28, 29) forming an arc from the outer peripheral part toward the inner peripheral part. ,
Head (14) cutter (19) and roller (21)
Guide holes (23, 24) extending from the outer periphery of the head (14) toward the center of the head (14) are provided corresponding to the respective attachment sites of the head (14), and the protrusions (2) protruding from the cutter (19) and the roller (21).
5, 26) are engaged with the cam grooves (28, 29) through the guide holes (23, 24) facing each other, and the stopper (6) is provided near the opening (17) of the frame (3).
8), the head support shaft (18) of the frame with a spring
A notch (67) provided by urging in the direction of insertion into the bearing receiving hole and notched from the head support shaft (18) through the pipe insertion hole (18a) to engage the toe of the stopper (68). A pipe cutter device characterized by being provided with. 6. The rotation driving means (8) has a drive shaft (10) from a motor (5) for forward and reverse rotation, a rotary drive gear (11), a first one-way clutch (56) and a slip ring (57). Are installed in front of and behind the turntable (2
7) is provided with a rotation driven gear (13), and both gears (11, 1)
3), a pair of rotary intermediate gears (12, 12) are interposed so as to mesh with both gears (11, 13), and the rotary driven gear (13) is pipe-inserted in the rotary disk (27). The pipe cutter device according to claim 5, further comprising a U-shaped pipe insertion hole (16) communicating with the hole (30). 7. The rotation suppressing means (9) is provided with a braking main gear (31) on a support shaft (18) of the head, and a braking slave gear (10) on an output shaft (10) from a motor (5) for normal and reverse rotation. Three
5) is rotatably provided, and a pair of braking intermediate gears (32, 32) are provided between both gears (31, 35).
1, 35) and the braking main gear (3
1) The pipe insertion hole (18a) of the head support shaft (18)
A pipe insertion hole (31a) communicating with the second one-way clutch (5) is attached to the braking slave gear (35).
Pipe cutter device according to claim 5 or 6, characterized in that it comprises a brake part (36) consisting of a brake drum (60) and a brake shoe (40) via 9).