JPS63109913A - Orbital mechanism of pipe saw - Google Patents

Abstract

PURPOSE:To improve driving efficiency by attaching a first eccentric pin to a gear surface perpendicular to the side face of a saw blade, providing a second eccentric pin eccentrically on the first eccentric pin, fixing a cam plate to a saw blade support rod, and inserting the first and second eccentric pins respectively in first and second slide grooves defined in the cam plate. CONSTITUTION:A first eccentric pin 12 is attached to a face of a driven gear 10, and a second eccentric pin 13 is eccentrically carried by the first eccentric pin 13. The first pin 12 and the second pin 13 are respectively engaged in a first slide groove 21 and a second slide groove 21a both defined in a cam plate 20 mounted to a saw blade support rod 18. When the gear 10 is rotated clockwise from an angular position where the second pin 13 is at the lowermost position, the cam plate 21 is forced transversely. As the second groove 21a is pushed upward by the second pin 13, the saw blade support rod 18 is lifted in vibrating condition around a contact portion with respect to support rollers 23, so that a saw blade 22 is displaced to the right to cut into a pipe P. This mechanism permits improvement of driving efficiency.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an orbital mechanism of a pipe saw, in which the blade edge is pressed against the cutting surface along with the pipe cutting movement in one direction of the saw blade.
This relates to an orbital mechanism that acts to separate the blade edge from the cutting surface along with a retraction movement in the other direction.

(Prior Art) Conventionally, an orbital mechanism for reciprocating the saw blade of a pipe saw by orbital motion is disclosed in, for example, Japanese Patent Laid-Open No. 61-44525.
It is well known as disclosed in the official gazette. However, the conventional orbital mechanism follows the tradition of drive mechanisms for pipe saws that do not have such a mechanism, and is equipped with a driven gear whose central axis is parallel to the side surface of the saw blade, as shown in the above-mentioned publication and Fig. 7. The eccentric pin C provided on the face of the driven gear is naturally parallel to the side surface of the saw blade, or the cam plate e fixed to the reciprocating saw blade mounting rod d is perpendicular to the side surface of the saw blade. In addition, the cam groove f provided on the cam plate e needs to be slanted with a different depth from one end to the other, or the upper and lower edges of the cam groove are slanted. Since the pin C is brought into contact with the bottom or upper and lower edges of the cam groove and moved to generate orbital movement in the saw blade mounting rod d and the saw blade, the saw blade mounting rod d is attached to the drive case a and moved by the spring. The blade mounting rod must be pressed in the direction of the eccentric cam by the pressing member.

There are various other orbital mechanisms, but the basic arrangement of the transmission mechanism, in which the center line of the driven gear is parallel to the side of the saw blade, has not changed, and as long as this transmission mechanism is used, the orbital mechanism must be complicated. .

(Problems to be Solved by the Invention) In view of the above-mentioned prior art, the present invention changes the attachment of the driven gear to the drive case by 90 degrees without following the conventional arrangement, and sets the center line of the driven gear to a saw blade. The purpose of this invention is to develop the orbital mechanism into a concrete invention, starting from the idea that the orbital mechanism can be simplified by making the orbital mechanism substantially perpendicular to the side surface.

(Means for solving the problems) The present invention meets the objectives stated in the previous section, and includes:
A driven gear whose center line is substantially perpendicular to the side surface of the saw blade is provided, a first eccentric pin slightly eccentric from the center of the driven gear is attached to the face of the driven gear, and the eccentric position of the first eccentric pin is fixed. A second sliding groove is provided on the reciprocating saw blade mounting rod that attaches the side surface of the saw blade to the tip thereof, and a second sliding groove that is orthogonal to the first sliding groove that is parallel to the length direction of the saw blade mounting rod. An orbital mechanism for a vibrating saw, characterized in that a cam plate provided with a groove is fixed, a first eccentric pin is fitted in a first sliding groove of the cam plate, and a second eccentric pin is engaged in a second sliding groove. This is related to.

A preferred embodiment of the invention is described in the following section.

(Embodiment) Figures 1 to 6 of the accompanying drawings show an embodiment of the present invention, in which Figure 1 is a partially cutaway side view, Figure 2 is a vertical front view, and Figure 3 is a perspective view of the cam plate. Figures 4 and 5 are front views of essential parts explaining the action, and Figure 6 is a diagram of an orbital curve.

In the figure, reference numeral 1 denotes a drive case, most of the front of which is opened for assembly of internal mechanisms, and a cover 2 is attached and fixed to the opening of the drive case. The drive case 1 is provided with a bearing support recess 4 and a through hole 5 in the upper part of FIG. and fit the bearing on the outer periphery of the motor main shaft into the bearing support recess 4.

The drive case 1 has a shaft support hole 7 formed with a cap 8 on its back surface, and a large diameter bevel gear (driven gear) 10 is supported by a bearing 9 on the inner surface of the shaft support hole 7 and an internal bearing 9a. Supports the shaft portion 11. The driven gear 10 is uniquely arranged so that its center line is substantially perpendicular to the side surface of the saw blade 22 as shown in FIG. 1, and is meshed with the small diameter bevel gear 6 to transmit rotation. A first eccentric pin 12 is attached to the face facing the release opening slightly eccentrically from the center line, and a second eccentric pin 13 is attached to the eccentric position of the first eccentric pin 12. The outer periphery of the first eccentric pin 12 is surrounded by an annular needle bearing 14, and a cover ring 15 is fitted around the outer periphery of the needle bearing 14. A support plate 16 supports the needle bearing retainer and the cover ring 15, and is attached to the first eccentric pin 12. A rotatable roller ring 17 is fitted into the second eccentric pin 13.

The eccentricity ε of the first eccentric pin 12 is made proportional to the width ε' of the center of the orbital curve shown in FIG.

Reference numeral 18 denotes a saw blade mounting rod whose upper end partially protrudes into the drive case 1, and a protective cover 25 provided on the lower side of the drive case 1.
A mounting portion 19 for attaching the side surface of the saw blade 22 is provided on the lower side passing through the sliding portion 26 of the drive case l, and as shown in FIG. A first sliding groove 21 parallel to the reciprocating direction of the saw blade mounting rod 18
A cam plate 20 provided with a second sliding groove 21a forming a right angle is fixed, and a first sliding groove 21 including a roller ring 17 is fixed.
Fit the eccentric pin 12 so that it can freely slide in the vertical direction in FIG.
The second eccentric pin 13 is fitted into the sliding groove 21a so as to be slidable in the lateral direction in FIG.

The saw blade mounting rod 18 is inserted between a pair of support rollers 23 which are sandwiched between the front surface near the lower surface of the drive case 1 and the cover 2 and supported by a shaft 24 so as to be freely rotatable.
Pass it to 6.

The protective cover 25 has a shaft 27 that is perpendicular to the side surface of the saw blade 22.
Install a clamp for pipe P! The shaft 27 is on the side of 2B.
, and the handle 29 allows the motor case 3, drive case l, protective cover 25, and saw blade 22 to rotate freely as shown by the first chain line.

(Function) The present invention provides a driven gear lO whose center axis is substantially perpendicular to the side surface of the saw blade 22, and has an eccentricity ε on the face surface of the driven gear 10 that determines the center ε′ of the orbital curve. A first eccentric pin 12 is attached, a second eccentric pin 13 is provided at the eccentric position of the eccentric pin 12, and the first eccentric pin 12 is attached to the first sliding groove 21 of the cam plate 20 provided on the saw blade mounting rod 18. Since the second eccentric pin 13 is fitted into the second sliding groove and the second eccentric pin 13 is inserted into the second sliding groove, when the second eccentric pin 12 is lowered the most by the driven gear 10 as shown in FIG. Since the pin 13 is located at the center in the longitudinal direction of the sliding groove 21, the saw blade mounting rod 18 and the saw blade 22 are at the lower limit position A of the orbital curve in FIG. 6, and the driven gear 10 then rotates clockwise. Until the first eccentric pin 12 rotates to the same level as the eccentric position with respect to the gear as shown in FIG.
a cam plate 20 having a first sliding groove that freely slides and engages the cam plate 20;
are sequentially pushed in the lateral direction, and the second sliding groove 21a is pushed up by the second eccentric pin 13 that engages therein, so that the saw blade mounting rod 18 vibrates around the contact portion with the support roller 23. The saw blade 22 is moved to the intermediate cloth direction WB of the obicle curve to maximize the cutting depth of the pipe P by the blade edge.

When the second eccentric pin 13 is at the highest angle as shown in Fig. 5, the saw blade mounting rod 18 returns the vibration by the first eccentric pin, and the cutting edge of the saw blade 22 reaches the upper limit position C of the orbital curve, which is slightly removed from the cutting depth. It changes and reduces the cut of the vibrator P.

Then, when the first eccentric pin 12 and the second eccentric pin 13 are rotated clockwise by the gear 10, the saw blade mounting rod 18 vibrates in the opposite direction due to the eccentricity of the first eccentric pin 12, and the second eccentric pin 12 vibrates in the opposite direction.
It is pushed down by the eccentric pin 13, passes through the middle left position of the orbital curve, reaches the lower limit position A, and removes the edge of the saw blade 22 from the cut.

(Effects) The present invention has the above-described configuration and operation, and the configuration in which the first eccentric pin 12 is eccentrically fixed to the face surface of the driven gear 10 by an eccentric amount proportional to the maximum amplitude of the orbital curve is different from the conventional one. The arrangement is different, and the saw blade mounting rod 18 is elastically pushed in the direction of the second eccentric pin 13 by a pressing member and pressed against the sliding groove 21a of the cam plate 20, and the saw blade mounting rod 18 is vibrated by the pressure and the orbital The driven gear 10 is provided with an eccentric pin 12 and a second eccentric pin 13.
The cam plate 20 fixed to the saw blade mounting rod 18 is provided with a first sliding groove 21 and a second sliding groove 21a.
The groove bottom of 1a or the upper and lower hole edges and 7 of the second eccentric pin 13
Since orbital motion is generated without forcing contact, there is no need to make the second sliding groove or the upper and lower groove edges of the groove sloped to match the orbital curve of the saw blade mounting rod 18 and the saw blade. Therefore, the cam plate 20 can be manufactured easily.

Also, the first eccentric pin 12 with respect to the rotation center of the driven gear 10
By simply selecting the amount of eccentricity of
The orbital motion of approximately 1,500 rotations is repeated, and the cutting load of the vibrator P is made proportional to the number of motions of the orbital curve, which has the effect of generating a minimum of 7 tangents and improving the driving efficiency of the motor.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention, in which FIG. 1 is a partially cutaway side view, FIG. 2 is a vertical front view, FIG. 3 is a perspective view of the cam plate 20, and FIG. 4.5 is an operational view. A front view of the main parts explaining the 6th
The figure is an explanatory diagram of an orbital curve. FIG. 7 is a partially cutaway side view of a conventional vibrating saw that does not have an orbital mechanism. 1 → Drive case 2 → Cover 6 → Small diameter bevel gear 10 → Bevel gear (driven gear) L → Center line 12 → First
Eccentric pin ° 13 → 2nd eccentric pin 14 → Needle bearing 15 → Cover ring 16 → Support plate ε → Eccentricity 18 → Saw blade mounting rod 20 → Cam plate 21 → 1st sliding groove 21 a- + 2nd F7J moving groove 22 → Saw blade Figure 7 Procedural amendment November 27, 1988 Director General of the Patent Office Mr. Jin 1, Indication of case Patent application 1987-2571962, Title of invention Orbital mechanism for pipe saw 3, Amendment with the case of the person making the amendment Related Applicant Name 7 Sada Co., Ltd. 4, Agent 6, Number of inventions increased by amendment 7, Subject of amendment Description 8, Contents of amendment As attached, Japanese Patent Application 1986-257196 Contents of amendment (1) On page 6, line 4 of the specification, the phrase ``upper part of Figure 1'' is corrected to ``upper part of Figure 2''. (2) On page 6, line 13 of the specification, the phrase "in Figure 1" is corrected to "in Figure 2."that's all

Claims (1)

[Claims] A driven gear whose center line is substantially perpendicular to the side surface of the saw blade is provided, a first eccentric pin slightly eccentric from the center of the driven gear is attached to the face of the driven gear, and the eccentric position of the first eccentric pin is fixed. A second sliding groove is provided on the reciprocating saw blade mounting rod that attaches the side surface of the saw blade to the tip thereof, and a second sliding groove that is orthogonal to the first sliding groove that is parallel to the length direction of the saw blade mounting rod. An orbital mechanism for a pipe saw, characterized in that a cam plate provided with a groove is fixed, a first eccentric pin is fitted in a first sliding groove of the cam plate, and a second eccentric pin is engaged in a second sliding groove. .