JPS6210130Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for printing predetermined characters, symbols, figures, etc. on the inner surface of a tube.

Generally, on pipes such as cast iron water pipes, the type code, year of manufacture, manufacturer's name or abbreviation, nominal diameter, etc. are clearly marked on the outside by casting or stamping.

However, even though it is easy to mark the outside of the tube in this way, even if the inside surface of the tube is simply printed with a rubber stamp or the like, the work is extremely difficult. That is, when the tube to be printed has a small diameter, and especially when marking is to be done relatively deep inside the tube, the difficulty of the operator's intervention becomes a decisive obstacle. Also, multiple characters,
When displaying symbols, figures, etc. at uniform intervals, the task was even more difficult, and even if it could be done, it would not only increase the number of man-hours, but also would not give a good finish. be.

However, in recent years, it has become mandatory for cast iron water pipes to display the manufacturer's name or its abbreviation and date of manufacture in a designated position on the inner surface of the pipe. In addition, there was a desire for a device that could display information reliably and efficiently.

The present invention was devised in view of the above circumstances, and is intended to solve all of the above problems. a cylindrical body having a cylindrical body, and a predetermined character housed within the body and supported so as to be able to protrude outward from the outer peripheral surface of the body;
The stamp member includes a stamp member having a symbol, a figure, etc., and an actuation mechanism for causing the stamp member to protrude outward from the outer peripheral surface of the main body by an operation from the outside of the tube, and the stamp member has a stamp member having a symbol, a figure, etc. By inserting the main body and causing the stamp member to protrude from the outer circumferential surface of the main body by operating an operating mechanism operated from outside the tube, the stamp surface of the stamp member provided with predetermined characters, symbols, figures, etc. The reason is that it is pressed into the tube and printed.

Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

In Figures 1 and 2, 1 is a cylindrical main body having an outer diameter smaller than the inner diameter of the tube to be printed, and covers 2 and 3 are screwed to both end surfaces of the main body 1, respectively. has been done. A handle 4 is provided upright in the center of one cover 2, and an actuation rod 7 passes through a through hole 3a provided in the center of the other cover 3 and passes through the handle 4 in the axial direction. is provided.

At approximately the center of the main body 1, cylinder parts 5a, 5b, ..., 5f are provided radially at positions that divide the circumference into six equal parts as shown in FIG. Possible piston members 6a, 6b, . . . 6f are fitted respectively. These piston members 6a, 6b, . . . , 6f are connected to arms 9a, 9b, .
They are each pivoted and connected by a link plate 8.

The piston members 6a to 6d have a large diameter and form a stamp stand, and a stamp holder 10 is fixed to the outer surface thereof, and as shown in FIG. A rubber stamp 12 is provided which is engaged in a mating manner. On the other hand, the piston members 6e and 6f have small diameters, and have cushioning rubber 13 attached to their outer surfaces.

Here, the cover 2 has an outer diameter larger than the inner diameter D of the tube to be printed, and the annular recess formed between the cover 2 and the main body 1 has a trapezoidal cross section with a tapered outer surface. An annular pad 14 is fitted therein. This pad 14 is made of soft rubber or the like, and between its large diameter R ₁ and small diameter R ₂ , R ₁ >D>
It has a relationship of R ₂ .

A grip 15 is attached to the end of the actuating rod 7 on the handle 4 side, and a retaining ring 16 is provided on the end of the actuating rod 7 on the cover 3 side to prevent it from coming off from the cover 3. Further, a coil spring 18 is provided between the cover 3 and a spring stopper 17 fitted into the stepped portion 7a of the actuating rod 7. This coil spring 18 always urges the actuating rod 7 to the right in FIG.

In this configuration, when holding the handle 4 of this device in your hand and inserting the main body 1 into the inner surface of a tube to be printed, first the tapered surface of the pad 14 comes into contact with the end of the tube; Since it is made of soft rubber, it deforms, so this does not prevent insertion, and the main body 1 is stopped when the end of the tube comes into contact with the cover 2. Therefore, the pad 14 positions the main body in the radial direction within the pipe, and the cover 2 positions the main body in the axial direction.

After positioning the main body 1 at a predetermined position within the pipe, grasp the grip 15 and push the actuating rod 7 into the main body 1, so that the coil spring 17
is compressed, and the link plate 8 changes from the inclined state shown in FIG. 1 to the upright state, and at the same time, as shown in FIG. 4, the piston members 6a, 6b, . guided by and pushed outward in a radial manner. Accordingly, the stamps 12 provided on the piston members 6a, 6b, 6c, and 6d print, for example, ABC (manufacturer's abbreviation) and the date of manufacture as shown in FIG. 5 on the inner wall of the tube. At this time, the piston member 6e,
The buffer rubber 13 attached to 6f comes into contact with the inner wall of the tube and serves to absorb the reaction force against the stamping force of the stamp 12 located at an axially symmetrical position.

When printing is completed, the operating rod 7 moves to the right by the elastic force of the coil spring 18, except for the pressing force applied to the grip 15, and the link plate 8 returns from its upright state to its tilted state. The piston members 6a, 6b, . . . , 6f are retracted in the axial direction. In this state, all you have to do is grasp the handle 4 and pull out the main body from inside the tube.

As shown in FIG. 3, the stamp 12 is engaged with the stamp holder 10 in many folds (in a concave and convex manner), so when replacing the stamp 12, the stamp 12 is pushed out in the direction indicated by the arrow E in FIG. It can be removed in this direction, and it can also be easily attached from this direction.

In this way, it has become possible to easily and reliably print on the inner surface of a tube with a diameter of 75 m/m or less, which was conventionally impossible to print on because it was impossible to insert the wrist.

In the above embodiment, the link plate 8 is used as an actuation mechanism for causing the stamp 12 and the member supporting it to protrude outward from the outer peripheral surface of the main body, but two and three actuation mechanisms other than this are used. An example is explained below.

In the embodiment shown in FIG. 6 (second embodiment), a cam 28 having a truncated cone shape is fixed to the actuating rod 7, and piston members 26a, 26b, . . .
..., 26f is configured such that the roller 20 rotatably provided can come into contact with the cam 28. and a stepped portion 25'a inside the cylinder portion 25a.
Three (or more) coil springs 21 are provided in an annular space formed between the outer stepped portion 26'a of the piston member 26a that can be guided by the cylinder portion 25a and moved in a radial direction. are arranged at equal intervals, and the piston member 26a is connected to the main body 1.
It is biased towards the axis of the Note that the same reference numerals as in FIG. 1 represent the same or similar parts.

Now, if this main body 1 is inserted into a predetermined position in the tube to be printed and the actuating rod 7 is pushed to the left in FIG. 6, the cam 28 will also move to the left, so the roller 20
While rotating, the piston member 26a is made to protrude in the radial direction, and the stamp 12 is pressed against the inner surface of the tube.
When the force pushing the actuating rod 7 is released, the coil spring 18
As a result, the actuating rod 7 and the cam 28 are returned to the right, and the piston member 26a is pushed back toward the axis of the main body by the coil spring 21.

The above operation has been described for the piston member 26a, but the other piston members 26b and 26
The same is true for the pistons c, .

In the embodiment shown in FIG. 7 (third embodiment), stamp pads 36a, 36b, .
When the disc-shaped cam 38 fixed to is moved from right to left in FIG.
a, 36b, ...36f are pushed by the cam 38,
The stamp 12 is configured to protrude outward from the outer peripheral surface of the main body. Also, each axis 31
The coil spring 30 provided in has one end facing the main body side,
The other end is engaged with the stamp pads 36a, 36b, . . . , 36f, respectively, and the stamp pads 36a, 36
b etc. are urged in a direction that allows them to be retracted inside the main body.

When the cam 38 is moved to the left in FIG. 7, the stamp pads 36a, 36b, etc. are projected outward, and the stamp 12 is pressed against the inner surface of the tube. Next, when the pressing force of the actuating rod 7 is removed, the actuating rod 7 is returned to the right by the coil spring 18, and the cam 38 is also returned to the right. It is then pulled inwards. This embodiment is characterized in that the movement path of the stamp 12 is not linear or radial, but is an arc centered on the pivot 31.

In the embodiment shown in FIG. 8 (fourth embodiment), a rubber bag 40 that almost fills the internal space of the main body 1 is provided, and an air pipe 40a passing through the cover 2 and the handle 4 is connected to this. ing. Further, each of the piston members 46a, 46b, . . . , 46f is provided with a protrusion 41 directed toward the axis of the main body 1. The annular space formed between the stepped part 45'a on the inside of the cylinder part 45a and the stepped part 46'a on the outside of the piston member 46a guided by this cylinder part 45a has a second embodiment. As in the example, three (or more) coil springs 42 are arranged at equal intervals. The coil spring 42 urges the piston member 46a toward the axis of the main body 1, and the piston member 46a is prevented from moving toward the axis by the inner cylinder 43.

In this configuration, when compressed air is sent into the rubber bag 40 from the air pipe 40a, the rubber bag 40 expands and fills the internal space of the main body 1, and then pushes the protrusion 41 outward, so that the piston member 46a protrudes. The stamp 12 is pressed against the inner surface of the tube. Then, when the air in the rubber bag 40 is released, the piston member 46a is pushed back toward the axis of the main body 1 by the elasticity of the coil spring 42, and the piston member 46a comes into contact with the inner cylinder 43 and is stopped.
The structure and operation of the piston member 46a described above are similar to those of the other piston members 46b, 46c, ..., 46f.
The same is true for the rubber bag 40; when compressed air is supplied to the rubber bag 40, the stamp 12 is simultaneously pushed out to the outside of the main body 1, and when the air is let out, it is immediately retracted into the inside of the main body 1.

In all of the above embodiments, the piston members are arranged in six equal parts in the circumferential direction of the main body 1, but the present invention is not necessarily limited to this, and one or more piston members are arranged. It suffices if there are a plurality of circles, and there is no problem even if they are arranged on a plurality of circumferences. Furthermore, it is not outside the scope of the present invention if the piston members are arranged in one or more rows in the axial direction of the main body 1.

As detailed above, the present invention is capable of printing even in small-diameter pipes where it is difficult to insert the wrist, and relatively deep parts of pipes, which have traditionally been difficult to print.
Moreover, it does not require a skilled person to arrange and display multiple characters, symbols, and figures at even intervals, and there is no disorder of arrangement or misalignment of letters, the finish is good, and type can be replaced. Moreover, since the device is lightweight, it is easy to handle, and the work is reliable, easy, and efficient, resulting in excellent effects such as reduction of work man-hours and improvement of workability.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line shown in FIG. Third
The figure is a perspective view of the piston member, stamp holder, and stamp in FIG. 1. FIG. 4 is an explanatory diagram of the operating mechanism, and FIG. 5 shows an example of printed characters and symbols. FIG. 6 is a cross-sectional view of another embodiment of the invention, FIG. 7 is a cross-section of a further embodiment of the invention, and FIG. 8 is a further embodiment operated by compressed air. FIG. 3 is an example cross-sectional view. 1: Main body, 2, 3: Cover, 4: Handle, {5
a, 5b, ...5f, 25a, 25b, ...25
f, 45a, 45b, ... 45f}: cylinder part, {6a, 6b, ... 6f, 26a, 26b,
...26f, 46a, 46b, ...46f}: Piston member, 7: Actuation rod, 8: Link plate, 9: Link stopper, 9a, 9b, ...9
f: arm, 10: stamp holder, 11: retaining pin, 12: stamp, 13: buffer rubber, 14: pad, 15: grip, 16: retaining ring, 17: spring stopper, 18: coil spring, 20: roller , 21: coil spring, 30: coil spring, 3
1: Pivot, 36a, 36b, ... 36f: Stamp stand, 38: Cam, 40: Rubber bag, 40a: Air piping, 41: Projection, 42: Coil spring, 43: Inner cylinder.

Claims (1)

[Claims for Utility Model Registration] A device for printing predetermined characters, symbols, figures, etc. on the inner surface of a tube, comprising a cylindrical body having an outer diameter smaller than the inner diameter of the tube to be printed, and the body. a stamp member having a predetermined character, symbol, figure, etc. accommodated in the tube and supported so as to be able to protrude outward from the outer circumferential surface of the main body; an actuation mechanism for causing the stamp member to protrude outward from the outer peripheral surface of the main body, the main body is inserted into the tube to be printed, and the stamp member is caused to protrude outward from the outer circumference of the main body by the actuation of the actuation mechanism operated from outside the tube. A tube inner surface printing device characterized in that the stamp surface of the stamp member on which predetermined characters, symbols, figures, etc. are provided is pressed against the inside of the tube and printed by protruding from the surface.