JPH078096Y2 - Pipe cutting groove machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a cutting and grooving machine used for cutting and grooving pipes at a piping site or the like.

(Prior Art) Generally, as a cutting machine used for cutting various pipes such as gas pipes and water pipes at a piping site or a construction site, the pipe is composed of two rollers attached to the tip of the lever and a circular cutter. A type in which pressure is applied and the lever is rotated by hand is often used, and there is also a type in which a ratchet mechanism is provided and the roller and cutter are rotated around the pipe by manual reciprocating operation of the lever. In many cases, cutting of the cutter is performed by rotating the screw handle by hand and pressing the cutter in the radial direction of the pipe.

In addition, recently, various types of pipe joints have been put into practical use. Therefore, at a predetermined position near the end of a cut pipe, a groove for fitting a bite ring or an O-ring, which is a joint component, or a joint for caulking is used. In many cases, a groove for fitting the positioning guide is provided, and this grooving operation is performed by the same operation as the above cutting, by replacing the cutter with a grooved roller in the above cutting machine.

(Problems to be solved by the invention) However, both the pipe cutting and the grooving by the conventional pipe cutting machine described above require manual labor, and the operation of the screw handle is complicated. Also, cutting and grooving are separate processes, and since the cutter and the grooving roller need to be replaced, the work efficiency is extremely poor.Because the groove position was determined by scribing work, this is a time-consuming process. The accuracy of the groove position was inferior, and there was a great risk of causing joint failure.

This invention solves the above-mentioned conventional problems, and can cut and groove a pipe efficiently without requiring a great deal of labor and labor, and can perform a groove at an accurate position. It is intended to provide a pipe cutting groove machine.

(Means for Solving the Problems) In the pipe cutting machine of the present invention, however, the driven gear having the tool case fixed to the side surface is rotatably attached to the housing about the central axis of the driven gear. The tool case and the housing are provided with an opening including the central axis and opening to the side of the central axis, and the tool case has two rotatable support rollers whose peripheral surface faces the central axis. And a circular cutter that faces the support roller and a grooved roller that is axially supported at one end at a predetermined interval in the axial direction, and an eccentricity that engages with the other end of the lever. A cam shaft to which a cam is fixed is attached rotatably around an axis parallel to the central axis, and the base end of a clutch arm that pivotally supports a cam roller at the tip is a one-way clutch. A cam plate for driving the cam roller is attached to the housing, and two drive gears meshing with the driven gear at a distance larger than the width of the opening are pivotally supported on the housing. A gear device for transmitting the rotation of the output shaft of the motor mounted in the housing to the drive gear is built in the housing, and at a position opposite to the tool case of the housing, one end portion of a substantially C-shaped jaw is provided. It is a pipe cutting groove machine with a pipe gripping clamp that has a rock cam supported.

(Operation) In the pipe cutting groove machine of the present invention, the tool case is rotatable with respect to the housing together with the driven gear,
If the tool case is rotated manually or electrically so that the openings provided in the tool case and the driven gear are approximately aligned with the openings provided in the housing, these openings will cause the pipe to move from the side to the center of the tool case. Since the insertion path for insertion is formed, the pipe is inserted into this opening and also inside the jaw of the clamp, and the pipe is locked by the cam. Next, when the motor is operated, the two drive gears meshing with the driven gear are driven by the motor through the gear device, and the driven gear having the opening is continuously rotated to rotate the tool case. The cam roller is pushed by the cam plate by the rotation of the tool case, and the clutch arm is rotated by a predetermined angle for each rotation of the tool case, and the eccentric cam is moved by a predetermined angle via the one-way clutch. The lever is rotationally driven by the movement, and the cutter and the grooved roller pivotally supported by the lever are supported by the support roller on the other side and stopped by the clamp. It is sent little by little and the pipe is cut and grooved.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS.

In the figure, 1 is a pipe cutting groove machine, in which a tool case 3 is rotatably attached to the tip of the housing 2, and a clamp 4 for holding a pipe is attached to the side surface of the housing on the opposite side of the tool case 3. A motor 5 for rotating the tool case 3 is attached to the base end of the tool. The motor 5 has a structure similar to that of a power tool such as a portable electric drill, and a handle 6 for gripping is formed at the end of the case, and is rotated by operating a trigger switch 7. Numeral 8 is a rod-shaped bracket for preventing tilting when the pipe cutting grooved machine 1 is placed on a floor or a table and used, and is fixed to the bottom of the housing 2 with bolts. A driven gear 9 is fixedly attached to the tool case 3 as shown in FIG. 2, and the driven gear 9 is slidably and rotatably held in the housing 2, and together with the tool case 3, the center axis of the driven gear.
It can be rotated around 10. As shown in FIGS. 2 and 3, at the mounting surface of the tool case 3 and the driven gear 9, the tool case 3 has a key-shaped protrusion 11 extending toward the central axis 10 of the driven gear. 9 is provided with a key groove-shaped concave groove 12 for guiding the protrusion 11 and an elongated hole 13 extending parallel to the concave groove. The tool case 3 includes a central axis 10 and a support roller 18 (described later). It is fixed to the driven gear 9 by bolts 14 so that the mounting position can be changed so that the distance can be adjusted. Further, the housing 2 and the driven gear 9 are provided with U groove-shaped openings 15 and 16 including the central axis 10 and opening to the side of the central axis, and the tool case 3 also has a larger opening than the U groove. A right-angled groove-shaped opening 17 is provided. As shown in FIG. 3, two support rollers 18 whose peripheral surfaces face the central axis 10 are rotatably mounted in the tool case 3. Reference numeral 20 denotes a lever rotatably attached to the tool case 3 by a shaft 21. A circular cutter 22 and a grooved roller 23 having a semi-circular cross-section ridge on its outer periphery are provided at a predetermined distance in the axial direction. A substantially U-shaped first lever 24 that is rotatably supported in a state of being separated by L, a second lever 25 that is foldably connected to the first lever 24 by a shaft 21, a first lever 24 and a second lever 24. 2 The adjusting screw 26 for adjusting the bending angle of the lever 25. The adjusting screw 26 is composed of a bolt 26a screwed to the second lever 25, a knob 26b and a top 26c which are fitted to the bolt with a clearance,
A diametrically extending blade-shaped ridge 26d is fixedly provided on the knob 26b, and three sets of recessed grooves 26e having different depths for inserting and removing the ridge 26d are provided on the top 26c, and the knob 26d is rotated. Ridge
By changing the groove 26e into which 26d is inserted, the first lever
The distance W between the shoulder portion of the top 26c engaging the convex portion of 24 and the second lever 25 is changed so that the cutter can be adjusted according to the pipe diameter.
The position of the roller 22 and the roller 23 is adjusted. The torsion spring 27 presses the first lever 27 against the top 26c of the adjusting screw 26 to integrate the lever 20 and presses the tip end of the second lever 25 against the eccentric cam 30. Eccentric cam 30
Is fixed to a cam shaft 31 rotatably attached to the tool case 3, and a cam roller 32 is rotatably attached to the tip of the cam shaft 31 by a support shaft 33A as shown in FIGS. 4 and 5. The clutch arm 33 pivotally mounted on the one-way clutch
Mounted via 34. One way clutch 34
Is for transmitting only the rotation of the clutch arm 33 in the arrow X direction in FIG. 3 to the cam shaft 31. 35 is a return spring for urging the clutch arm 33 in the direction opposite to the arrow X,
Reference numeral 36 is a pin-shaped stopper for regulating the return position of the clutch arm 33. A knob 37 is fixed to the protruding end of the cam shaft 31. 38 is a compression spring 38 built into the knob 37.
It is a stopper consisting of a and a ball 38b, and 39a is a hole through which the ball 38b is engaged and disengaged.
It is recessed in 9. Then, as shown in FIG. 3, at the rotational position of the cam shaft 31 where the eccentric amount of the eccentric cam 30 is minimum with respect to the second lever 25 (that is, the second lever 25 is in the most advanced state in the arrow Y direction). The position of the hole 39a is set so that the ball 38b of the stopper 38 provided on the knob 37 integral with the cam groove 31 engages with the hole 39a. Reference numeral 40 denotes a cam plate for driving the cam roller 32, which is fixed to the housing 2 by bolts 41 as shown in FIG. 3, and the cam plate 40 and the cam roller 32 are provided as shown in FIG. The bolt 41 is not shown in the drawing), and the outer circumference of the cam roller 32 that rotates together with the tool case 3 is in a positional relationship of contacting the side portion of the cam plate 40. The cam plate 40 can change the mounting position in the arrow Q direction along the guide 42 projecting from the housing 2, whereby the pushing amount of the cam roller 32 driven in contact with the cam plate 40 in the arrow Q direction can be changed. δ (see Fig. 10) can be finely adjusted.

In FIGS. 2 and 6, reference numeral 4 denotes a self-locking clamp for gripping a pipe, which is a substantially C-shaped joyo 52 having a V-shaped bearing surface 51 for supporting the pipe at two points, and the joyo bearing. The cam 54 is rotatably attached by a shaft 53 to the end portion facing the surface 51. The cam 54 has three types of arc-shaped clamp surfaces 55a to 55c centered on a position eccentric from the center of the groove 53 so as to accommodate pipes of three types of diameters. Reference numeral 56 is a knob for rotating the cam. A bolt 58 inserted into an elongated hole 57 formed in the jaw 52 is screwed and fixed to a seat 59 protruding from the housing 3, and the jaw 52 can move freely within the range of the elongated hole 57 to cut a pipe or cut a groove. It is possible to follow the sideways swing of the pipe center that occurs when attaching.

On the other hand, as shown in FIGS. 7 to 9, in the housing 2, drive gears 61 and 62 having the same number of teeth that mesh with the driven gear 9 at a distance larger than the width of the opening 16 are axially supported. A driving gear 63 fixed to the output shaft 5a of the motor 5, the driving gear 63
The second gear 6 that rotates integrally with the first gear 64 that meshes with the
5, a first bevel gear 67 that rotates integrally with a third gear 66 that meshes with the second gear 65, and a second bevel gear 67 that meshes with the first bevel gear 67
A fourth gear 70 connected to a bevel gear 68 via a one-way clutch 69, and a fifth gear having the same number of teeth which meshes with the fourth gear 70 and rotates integrally with the drive gears 61 and 62, respectively.
The gear device 73, which is composed of 71 and 72, has the output shaft 5a of the motor 5.
Is incorporated in the housing 2 as a power transmission mechanism for transmitting the rotation of the drive gears 61 and 62 to the drive gears 61 and 62. The one-way clutch 69 is in the tool case 3 when the motor 5 is stopped.
It is provided so that can be rotated lightly by hand.

In order to perform cutting and grooving of a pipe using the pipe cutting and grooving machine 1 having the above configuration, first, according to the diameter of the pipe,
The fixing position of the tool case 3 with respect to the driven gear 9 by the bolt 14 is changed so that the center of the pipe contacting the support roller 18 substantially coincides with the center of the driven gear 9. At the same time, rotate the cam shaft 31 to make the stopper 38
39a, the tip of the second lever 25 is advanced most in the direction of the arrow Y in the third figure, and the cam shaft 31 is set to the reference position where cutting and grooving are started. By changing the concave groove 26e into which the protruding strip 26d of the part is fitted, the cutter 22 is set so as to come closest to the outer peripheral surface of the pipe according to the pipe diameter. FIG. 3 shows a state in which each part is set to the pipe P having the largest diameter. Then, the tool case 3 is manually turned in the direction of the arrow Z so that the openings 16 and 17 are substantially aligned with the opening 15 of the housing 2 as shown. Then, as shown by the arrow S, the pipe P is inserted into the openings from the side of the openings, and the cam 54 of the clamp 4 is rotated while the pipe P is in contact with the two support rollers 18 and the clamping surface thereof is rotated. Is pressed against the outer circumference of the pipe P. Next, the motor 5 is rotated by the trigger switch 7. Motor 5
The rotation of the output shaft 5a is transmitted to the drive gears 61 and 62 via the gear device 73, the driven gear 9 is driven, and the tool case 3 rotates in the arrow Z direction. The driven gear 9 has an opening 15, but since it is meshed with the two drive gears 61 and 62, it is continuously and smoothly driven to rotate. As the tool case 3 rotates, the cam roller 32 contacts the side surface of the cam plate 40,
As shown in FIG. 10, the cam roller 32 is pushed in the direction of arrow Q, and the center of the cam roller 32 moves along the locus R. That is, the cam roller 32 that has moved circularly around the central axis 10 together with the tool case 3 comes into contact with the side surface of the cam plate 40 and is driven to be pushed by the pushing amount δ in the direction of arrow Q to the position shown by the chain line 81. After passing, the cam roller returned to the position shown by the chain line 82.
32 further rotates together with the tool case 3 and repeatedly receives the same pushing drive. As a result, the clutch arm 33 rotates in the direction of arrow X by a predetermined swing angle corresponding to the pushing amount δ for each rotation of the tool case 3, and this rotation is performed via the one-way clutch 34. Since the eccentric cam 30 is rotated by a predetermined angle, the lever 20 is rotated by a small angle in the direction opposite to the arrow Y, and the cutter 22 and the roller 23 are moved in the tool case 3 by one. It is sent to the pipe P with each rotation, and the cutter 22 and the roller 23
Cutting and grooving are performed by press-fitting the outer periphery of the pipe. This adjustment of the feeding amount can be performed by changing the set position of the cam plate 40 in the direction of arrow Q. Further, during the cutting and grooving, the clamp 4 holds the pipe P to prevent its rotation. When the pipe P cuts off, the motor 5 is stopped, the clamp 4 is released, and the next pipe is cut and grooved in the same manner. By the above process, the accurate grooves M in a position by connexion determined axial spacing L of the 11 Katsuta 22 and the roller 23 as shown in figure grooving been grooved pipe P _M, obtained in a short period of time less effort You can

The present invention is not limited to the above-described embodiment. For example, in the above-described embodiment, the one-way clutch is provided in the gear device 73.
Since the tool case 3 can be easily rotated manually because the 69 is interposed, the one-way clutch 69 is omitted when the tool case 3 can be moved slightly by the inching of the motor 5 or when the reduction gear ratio of the gear device 73 is small. You can also do it.
Further, in the above embodiment, the lever 20 is provided with the cutter 22 and the roller.
A first lever 24 that supports 23, a second lever 25 that is foldably connected to the first lever 24, and an adjusting screw 26 for adjusting the bending angle of the first lever 24 and the second lever 25. Since it has been configured, it has an advantage that cutting and grooving can be performed without trouble even if the pipe diameter of the cutting target changes greatly, but when the pipe diameter of the cutting target does not change significantly,
The lever 21 may have an integral structure that does not bend.

(Effect of the Invention) As described above, according to the present invention, cutting and grooving of a pipe can be performed in one step by using a motor as a power source, and it is not necessary to grip the pipe by hand, and a cutter and a roller can be fed. The tool labor and time required for cutting and grooving are significantly reduced compared to the conventional method, because the tool is automatically performed every 1 rotation of the tool case. In addition, cutting and grooving are performed at the same time. No work is required, and it is possible to make a groove at an accurate position from the end face of the pipe.

[Brief description of drawings]

FIG. 1 is a front view of a pipe cutting grooved machine showing an embodiment of the present invention, and FIG. 2 is a plane (partially cut) taken along the line AA in FIG.
Fig. 3, Fig. 3 is a sectional view taken along the line BB in Fig. 2, Fig. 4 is a developed sectional view taken along the line C-C of the tool case in Fig. 3, and Fig. 5 is a sectional view taken along the line D-D. FIG. 7 is a sectional view taken along the line EE of FIG. 2, FIG. 7 is a sectional view taken along the line FF of FIG. 7, and FIG. 8 is a sectional view taken along the line GG of FIG.
FIG. 9 is a sectional view taken along the line, FIG. 9 is a side view taken along the line H-H in the same manner, FIG. 10 is an operation explanatory view showing a pushing drive operation of the cam roller 32 by the cam plate 40 in FIG. 3, and FIG. It is a partially cut front view shown. 1 ... Pipe cutting groove machine, 2 ... Housing, 3 ... Tool case, 4 ... Clamp, 5 ... Motor, 9 ... Driven gear, 10 ... Center axis, 15 ... Opening, 16 ... … Aperture, 17 …… Aperture, 18 …… Support roller, 20 …… Lever, 21 …… Shaft, 22 …… Cut, 23 …… Roller, 24 …… First lever, 25 …… Second lever, 26 …… Adjusting screw, 30 ……
Eccentric cam, 31 …… Cam shaft, 32 …… Cam roller, 33 …… Clutch arm, 33A …… Support shaft, 34 …… One-way clutch, 40 …… Cam plate, 61 …… Drive gear, 62 …… Drive gear,
73 ... Gear device.

Claims (1)

[Scope of utility model registration request] 1. A driven gear having a tool case fixed to its side surface is rotatably mounted on a housing about a central axis of the driven gear, and the driven gear, the tool case and the housing include the central axis. An opening opening to the side of the central axis is provided, and two rotatable support rollers whose peripheral surfaces face the central axis are arranged side by side in the tool case, and a circular cutter facing the support roller. A lever for axially supporting a grooved roller at a predetermined interval in the axial direction, and a cam shaft fixed with an eccentric cam for engaging the other end of the lever in parallel with the central axis. The clutch arm is rotatably mounted around the axis, and the base end of a clutch arm that pivotally supports a cam roller is attached to the cam shaft via a one-way clutch. A drive cam plate is attached, and two drive gears that mesh with the driven gear at intervals equal to or greater than the width of the opening are pivotally supported on the housing to rotate the output shaft of the motor mounted on the housing. A gear device for transmitting to the drive gear is built in the housing, and at the position opposite to the tool case of the housing, a lock cam is pivotally supported at one end of a substantially C-shaped jaw to hold a pipe. A pipe cutting groove machine with a clamp attached.