JPH10272809A - Printer for pipe-shaped article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small sized printer capable of effectively printing on a pipe-shaped article. SOLUTION: This printer comprises a pipe-shaped article supporting mechanism (air chuck 11 and the like) that restricts movement of a pipe-shaped article P in a direction of an axis thereof and a direction perpendicular thereto and rotatably supports the pipe-shaped article P around a shaft, a pipe-shaped article rotating mechanism (rotating shaft 31 and the like) that is connected to one end of the pipe-shaped article P supported by the pipe-shaped article supporting mechanism and drives to rotate the pipe-shaped article P around the shaft, a print head moving mechanism (bracket 65 and the like) that moves a print head 52 in parallel to the axis of the pipe-shaped article P in proximity therewith and a print head positioning mechanism that positions the print head 52 on a predetermined printing position. Printing is performed on a circumference of the pipe-shaped article P by positioning the print head 52 on the printing position by means of the print head positioning mechanism and by rotating it by means of the pipe-shaped article rotating mechanism. The printing is performed at a predetermined interval in the axis direction of the pipe-shaped article.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for printing scales on tubular articles such as sewage main pipes, sewage pipes or risers used for sewage or drainage mass manholes. is there.

[0002]

2. Description of the Related Art Conventionally, in a manhole such as sewage or drainage, a sewage pipe formed of a vinyl chloride resin or the like is connected to a main pipe by a mass, and the sewage pipe is connected to the mass and raised toward the ground. A riser is provided. Here, for example, when a riser having a predetermined length is formed, the approximate length from the mass to the ground is measured, and the tubular object formed to a certain length is cut to that length.

[0003]

However, in the above-mentioned conventional method, in order to cut a fixed-length tubular article into a predetermined length, the length up to the cutting position must be measured each time. There was a problem. In addition, in order to cut in a direction perpendicular to the axis of the tubular object, there is a problem that it is necessary to draw a marking line around the outer periphery of the cutting position of the tubular object with a marker pen or the like. For this reason, there has been a problem that the cutting operation of the tubular article becomes complicated and the work efficiency is reduced.

Here, it is conceivable to print a scale in advance in the axial direction of the tubular object. However, it is necessary to perform printing while transporting a tubular object having a length of several meters, which causes a problem that the printing apparatus becomes extremely large. further,
When printing is performed by a normal printing method, for example, flexographic printing, there is a problem that printed scales are easily erased. That is, for example, several tubular articles are packed together and transported, and the like, so that the tubular articles rub against each other during the transport or the like, and the printed scale becomes dirty or peeled off, or the scale of one tubular article becomes the other tubular article. There is a problem that it may be transferred to an object. Therefore, an object to be solved by the present invention is to provide a small-sized apparatus that can efficiently print on a tubular object.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention according to claim 1 restricts movement of a tubular object in a longitudinal axis direction and a direction perpendicular to the longitudinal axis direction, and at the same time, around the axis. A tubular object support mechanism that rotatably supports the tubular object, and a tubular object rotation mechanism that is connected to one end of the tubular object supported by the tubular object support mechanism and drives the tubular object to rotate around its axis. A print head moving mechanism for moving a print head in a state of being parallel to an axial direction of the tubular object supported by the tubular object support mechanism and in the vicinity of the tubular object, and the print head of the print head moving mechanism A print head positioning mechanism for positioning the print head at a predetermined print position, the print head positioning mechanism positions the print head at the print position, and the tubular object rotation mechanism positions the tubular object. Performs predetermined printing on the outer periphery around the tubular article by rolling, and performing at predetermined intervals and the printing in the axial direction of the tubing.

According to a second aspect of the present invention, in the tubular printing apparatus according to the first aspect, a reference position detection sensor for detecting a reference position in the rotation direction of the tubular object rotation mechanism and a predetermined range in the rotation direction are detected. A rotation position detection mechanism having a rotation range detection sensor, and detecting that the print head of the print head positioning mechanism has been positioned, and further detecting the reference position by the reference position detection sensor of the rotation position detection mechanism. A control unit that performs printing in the predetermined range detected by the rotation range detection sensor.

[0007] The third aspect of the present invention is the first or second aspect.
In the tubular article printing apparatus, the print head positioning mechanism has a plurality of positioning sensors and detectors corresponding thereto, one is connected to the print head and moved, the other is the printing head A different pattern or the same pattern for each of the positioning sensors that is arranged at a predetermined position along a moving direction of the print head of the head moving mechanism and that positions the print head based on the detection of the positioning sensor and detects the detector. Is printed.

[0008]

According to the first aspect of the present invention, the tubular object is supported by the tubular object support mechanism so that it can rotate only around its axis.
It is rotated by a tubular object rotation mechanism. Further, the print head is moved by the print head moving mechanism, and is positioned at a predetermined printing position in the axial direction of the tubular object by the print head positioning mechanism. Then, printing is performed by the print head around the outer periphery of the tubular article while the tubular article is rotated. 1
When one print is completed, the print head is moved to the next print position in the axial direction of the tubular object by the print head moving mechanism,
Printing is performed at that position. Therefore, printing is sequentially performed at predetermined intervals in the axial direction of the tubular object.

According to the second aspect of the present invention, when the positioning of the print head is detected and then the reference position of the tubular object is detected, printing is performed in a predetermined range in the rotating direction of the tubular object. Therefore, printing is performed at a fixed position in the rotation direction of the tubular object. According to the third aspect of the present invention, the print head is positioned by the plurality of positioning sensors and the corresponding detectors, and a different pattern or the same pattern is printed on the tubular object for each positioning sensor that has detected the detector.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are a front view and a plan view showing a printing apparatus 1 according to an embodiment of the present invention. The printing device 1 is a tubular material (vinyl chloride pipe)
This is a device for performing predetermined printing on the outer periphery of P and performing the printing at predetermined intervals in the axial direction of the tubular object P.

First, the configuration of the printing apparatus 1 will be described. The printing apparatus 1 includes: (1) air chucks 11 to 11 that restrict the movement of the tubular material P in the longitudinal axis direction and the direction perpendicular thereto and support the tubular material P rotatably around the axis.
A rotating shaft 3 connected to one end of the tubular object P supported by the tubular object supporting mechanism and (2) the tubular object P supported by the tubular object supporting mechanism, and driving the tubular object P to rotate around its axis;
(3) moving the print head 52 in a state parallel to the axial direction of the tubular article P supported by the tubular article support mechanism and in a state close to the tubular article P; A print head moving mechanism including a bracket 53 to a bracket 65; and (4) a print head positioning mechanism including a proximity switch 71 to a detector 74 for positioning the print head 52 of the print head moving mechanism at a predetermined printing position. I have.

The printing apparatus 1 further includes a proximity sensor (reference position detection sensor) 44 for detecting a reference position in the rotation direction of the tubular object rotation mechanism and a proximity sensor 43 (rotation range detection sensor) for detecting a predetermined range in the rotation direction. Having a rotating plate 41
A rotation position detection mechanism including a proximity sensor 44.

In the tubular object support mechanism, a support frame 1 is provided.
5, roller mounting portions 16a are provided at three places in the longitudinal direction.
Are provided, and a pair of support rollers 16b are rotatably mounted on the roller mounting portion 16a. The pair of support rollers 16b are juxtaposed in a direction perpendicular to the longitudinal direction of the support frame 15, and are arranged so as to circumscribe the tubular object P when the tubular object P is placed from above. ing. The tubular object P placed here is rotatable around the axis and is movable in the axial direction. The lower side of the support frame 15 is supported by a lifting cylinder 19 mounted on the base frame 2. A shaft 17 is provided on the lower surface of both ends in the longitudinal direction of the support frame 15, and the shaft 17 is slidably fitted in a guide rod 18 mounted on the base frame 2. As described above, the support frame 15 is configured to be movable in the vertical direction in FIG.

1 and 2, the base frame 2 extends upward and has a cylinder 1 at its upper end.
3 is provided with a tower 12. The cylinder 13 includes a movable shaft 13a that can move in the vertical direction, and a support plate 13b attached to a lower end of the movable shaft 13a. A pair of pressing rollers 14 are rotatably attached to the support plate 13b. The pressing roller 14 is disposed so as to coincide in the height direction with the supporting roller 16b attached to the rightmost side in FIGS.

The air chuck 11 is fixed by a member formed in a cylindrical shape. FIG. 1 of the air chuck 11,
A chuck claw 11a is attached around the outer periphery on the right side of the center 2. Although not shown, four chuck claws 11 a are provided around the outer periphery of the air chuck 11 at intervals of 90 degrees. The outer shape of the chuck claw 11a is formed in the same shape as the shape of the inner peripheral surface of the tubular object P. The tubular object P is
The left end surface is abutted against the chuck pawl 11a, and the inserted chuck pawl 11a is held on the chuck pawl 11a by spreading.

In the tubular object rotating mechanism, the rotating shaft 31 is
The air chuck 11 is connected to the left side in the figure. On the other hand, a support frame 33 is provided on the base frame 2, and two bearings 32 are mounted on the support frame 33.
It is rotatably supported by. FIG. 1 of the rotating shaft 31,
2, a pulley 34 is attached to the left end portion.
This pulley 34 and a pulley 36 attached to the shaft of a drive motor 35 installed on the base frame 2
They are connected by a belt 37. Therefore, when the driving motor 35 is driven, the driving force rotates the rotating shaft 31 and the air chuck 11 is rotated accordingly.

In the print head moving mechanism (see FIG. 2), the feed screw 62 is arranged so as to extend in parallel with the axial direction of the tubular article P supported by the tubular article supporting mechanism. The right end of the feed screw 62 in FIG. 2 is rotatably supported by a support member 63 attached to the base frame 2. The left end of the drive motor 6
It is connected to one rotating shaft. A ball screw (female screw) 64 is screw-connected to the feed screw 62.
An L-shaped bracket 65 is attached to the ball screw 64. The tip of the bracket 65 extends above the air chuck 11.

A print head 52 is fixed to the tip of the bracket 65 by a plate-shaped bracket 53 bent in an L-shape. In the present embodiment, the print head 52 is of an ink jet printer head, that is, a type in which ink is ejected from nozzles using a charge applying element. The reason why the ink jet printer head is employed in the present embodiment is that the ink has good fixability, has a quick drying property, and is difficult to print even when the tubular objects P are rubbed against each other.

In this embodiment, an ink tank and other printer main body 51 are mounted on the upper right side of the printing apparatus 1 in FIG. 2, and the printer main body 51 and the print head 52 are used to supply ink. Pipe (not shown)
Are connected by Therefore, at the time of printing, ink is transferred from the printer body 51 to the print head 5 via the pipe.
2 is supplied.

In the print head positioning mechanism (see FIG. 2), the detectors 73 and 74 are attached to the side surface of the side frame 3 which stands vertically from the base frame 2 along the direction in which the feed screw 62 extends. . The detectors 73 and 74 are alternately arranged, and the detectors 73 and 74
It is attached so that the position in the height direction is different. Proximity switches (positioning sensors) 71 and 72 for detecting the detectors 73 and 74 are mounted on the bracket 65 at positions corresponding to the heights of the detectors 73 and 74, respectively. Accordingly, when the bracket 65 is fed to the right side in FIG. 2 by the feed screw 62, first, the proximity switch 71
, And then the proximity switch 72 detects the detector 74, which is alternately performed. In the present embodiment, the detector 7
3 and 74 are provided at a pitch of 100 mm.

In the rotational position detecting mechanism, a disk-shaped rotary plate 41 is provided at an end of a pulley 34,
Two proximity sensors 43 and 44 are arranged so as to face 1. The proximity sensors 43 and 44 are mounted on a mounting plate 42 provided on the base frame 2.

FIG. 3 shows the rotary plate 41 and the proximity sensor 43.
And FIG. 44 in detail. 1A is a front view, and FIG. 1B is a view in the direction of the arrow X in FIG. Rotating plate 4
On the surface on the side of one proximity switch 43 and 44, protruding detectors 41a and 41b are provided. Detector 41
“a” is formed in an arc shape in a predetermined range (a range of 270 degrees in the present embodiment) of the outer peripheral edge of the rotating plate 41. The detector 41b is formed in a cylindrical shape, and is provided at a position shifted from the center of the rotating plate 41 toward the center of the range where the detector 41a is not formed.

The proximity switch 43 is for detecting the detector 41a, and is turned off without detecting the detector 41a in the range of 90 degrees due to the rotation of the rotating plate 41, and is turned off.
In the range of 70 degrees, the detector 41a is turned on in proximity to the detector 41a.
That is, the proximity switch 43 moves the 27
A range of 0 degrees is detected. The proximity switch 44 includes the detector 4
The detector 41b is turned on when the detector 41b is detected once per rotation by the rotation of the rotary plate 41.
That is, the proximity switch 44 detects the reference position in the rotation direction. At this time, the proximity switch 43 has not detected the detector 41a.

An operation unit 80 is provided on the lower left side of the printing apparatus 1 in FIG. The operation unit 80 is turned on.
/ OFF, opening and closing of chuck jaws 11a, lifting cylinder 19
, And the drive motors 35 and 61 are driven. Further, although not shown, the printing apparatus 1 is provided with a control unit including a CPU for controlling the operation thereof.
It is electrically connected to the proximity switches 43, 44, 71 and 72 and the printer main body 51, and controls the printing operation of the printer main body 51 and the print head 52 according to the output of the proximity switch 43 and the like.

Next, the operation of the printing apparatus 1 will be described. First, a tubular object P (length 2 m in the present embodiment) is placed so as to circumscribe each support roller 16b. According to the above-described configuration, various sizes of tubular objects P having different outer diameters can be placed. Then, the elevating cylinder 19 is driven so that the center of the tubular object P coincides with the center of the air chuck 11, and the position of the tubular object P in the height direction is adjusted. continue,
The tubular object P is moved to the air chuck 11 side, and one end of the tubular object P abuts against the positioning member of the chuck pawl 11a and stops.

Then, the air chuck 11 is driven,
As the chuck pawl 11a expands, the inner peripheral surface of one end of the tubular object P is held by the chuck pawl 11a. Further, the cylinder 13 is driven toward the tubular object P, and the pressing roller 14 is disposed so as to circumscribe the upper portion of the tubular object P. As described above, the tubular object P is supported so as to be able to rotate only around its axis.

When the drive motor 35 is driven in this state, the driving force is transmitted from the rotating shaft 31 to the air chuck 11, and the air chuck 11 is driven to rotate. Thereby, the supported tubular object P is rotated. Here, since the support roller 16b and the pressing roller 14 are provided rotatably, the tubular object P is smoothly rotated without generating a large frictional force. In the present embodiment,
The tubular object P is continuously rotated during the printing process. Subsequently, the drive motor 61 is driven, and the feed screw 62 is rotated by the driving force. As a result, the ball screw 64 screw-coupled to the feed screw 62, and the bracket 65 and the print head 52 connected to the ball screw 64 are moved rightward in FIG.

FIG. 4 is a flowchart for explaining the operation of the printing apparatus 1 when printing on the tubular material P. Also,
FIG. 5 is a timing chart showing the relationship between the output of each of the proximity switches 43, 44, 71 and 72 and the passage of time. Hereinafter, the printing operation will be described with reference to an example in which the scale is printed on the tubular object P. S (step) 100 in FIG.
In step S101, the number of prints N is initialized to 0 in step S101. Then, in S102, the drive motor 61 is driven to position the print head 52 at the first print position. The movement of the print head 52 is performed until the proximity switch 71 or 72 is turned on (in this embodiment, the proximity switch 71 is first turned on). When the proximity switch 71 detects the detector 73 in S103,
At N (time t1 in FIG. 5), the drive of the drive motor 61 is stopped in S104, the movement of the print head 52 is stopped, and the print head 52 is positioned.

Subsequently, in S105, it is determined whether or not the proximity switch 44 has been turned ON. When the proximity switch 44 is turned on by detecting the detector 41b (time t2), in the next S106, it is determined whether or not the proximity switch 43 is turned on. Proximity switch 4 in S106
When the detector 3 is turned ON by detecting the detector 41a (time t3), the print head 52 starts printing scales (lines) on the tubular object P.

Here, the printer main body 51 controls so as to print a thin line when the proximity switch 71 is ON at the time of printing and to print a thick line when the proximity switch 72 is ON at the time of printing. Therefore, in S107, it is determined whether or not the proximity switch 71 is ON. If the proximity switch 71 is ON, the process proceeds to S108 to print a thin line, and if it is OFF (when the proximity switch 72 is ON), the process proceeds to S109 and a thick line is drawn. Print. In this embodiment, a thin line is printed first.
Printing is continuously performed while the proximity switch 43 is ON in S110, and when the proximity switch 43 does not detect the detector 41a and is turned OFF (time t4), S11 is performed.
Go to 1 and end. That is, since the proximity switch 43 is ON while the rotating plate 41 rotates 270 degrees,
A scale is printed around the outer periphery of the tubular object P in a range of 270 degrees.

In the next S112, 1 is added to the number of times of printing N, and the flow advances to the next S113. Then, in S113, it is determined whether or not the number of prints N has become 19 times. That is, in the present embodiment, 10 m for the tubular body P having a length of 2 m.
Since graduations are printed at 0 mm intervals (pitch of the detector 73 or 74), 19 graduations are printed on one tubular body P. After printing 19 graduations, printing is terminated. That's why.

If 19 scales have not been printed yet, the process proceeds to S114, where the proximity switch 44 is turned on.
Is determined. Proximity switch 44 is ON
(Time t5), the process proceeds to S102 and the drive motor 6
1 is driven, and the print head 52 is moved rightward in FIG. Also, with this movement, the proximity switch 71 is turned off.
It becomes F. Then, as described above, when the proximity switch 71 or 72 (in this case, the proximity switch 72) is turned ON (time t6), the process proceeds to S104, and the movement of the print head 52 is stopped.

Subsequent operations are performed in the same manner as in the first printing. That is, the proximity switch 44 is turned on in S105 (time t7), and further in S106, the proximity switch 43 is turned on.
Is turned on (time t8), printing is started. However, in the second printing, since the proximity switch 72 is ON, the process proceeds from S107 to S109 and a thick line is printed. Then, in S110, the proximity switch 43
At the point of time when the time becomes F (time t9), the process proceeds to S111 and printing is stopped. By repeating the above operation, a scale in which thin lines and thick lines are alternately arranged at a pitch of 100 mm is printed on the tubular object P. FIG. 6 is a perspective view showing the tubular object P on which the scale is printed. In the example of FIG. 6, while printing a line indicating perpendicularity in the axial direction of the tubular object P,
The scale is printed so as not to cross the line. The line indicating the perpendicularity may be printed by positioning the tubular object P at the reference position detected by the proximity switch 43 in the rotation direction of the tubular object P, and before printing the scale (for example, manufacturing of the tubular object P). The printing may be performed separately (at the line) or later, or may be performed, for example, after printing a predetermined number of scales, when returning the print head 52 to the desired position.

On the other hand, the above printing is performed 19 times, and S11
If it is determined in step 3 that the number of prints N has reached 19, the process proceeds to the next step S115, in which the drive motor 61 is driven in the direction opposite to the direction at the time of printing to return the print head 52 to the initial position.
At 6, the printing operation is completed. Thereafter, the control unit drives the air chuck 11 to close the chuck claws 11a, retreats the moving shaft 13a of the cylinder 13 upward, and releases the holding of the tubular object P.

In this embodiment, the operation of positioning the print head 52 at the next printing position is performed during one rotation of the tubular material P. That is, after the proximity switch 44 is turned on at time t5, it is turned on again at time t7.
In the meantime, the rotation speed of the tubular object P (the rotation speed of the drive motor 35) and the printing are set so that the proximity switch 72 is turned on (detecting the detector 74) and the print head 52 is positioned. The moving speed of the head 52 (the drive motor 61
Rotation speed). In this way, printing can be performed during one rotation of the tubular material P, and the printing head 52 can be alternately moved and positioned during the next rotation, thereby improving printing efficiency. it can.

The embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and the following modifications are possible. (1) In the embodiment, a linear scale is printed, but this line is not limited to a continuous line, but is a discontinuous line (broken line, chain line).
It may be. The scale is not limited to a line but may be a scale in which characters, symbols, and the like are arranged. Further, the lot number is not limited to the scale. Or a company name may be printed. (2) In the embodiment, the scale of the thick line and the scale of the thin line are alternately printed, but one type of scale or the like may be printed.
In this case, only one proximity switch 71 and 72 is sufficient, and the corresponding detectors 73 and 74 need not be arranged alternately in the vertical direction.

(3) In the embodiment, the ink jet printer head is used as the print head 52, but another print head (for example, a thermal transfer printer head) can be used. (4) In the embodiment, the printing is performed in the range of 270 degrees around the outer circumference of the tubular object P. However, the printing is not limited to this, and the number of the printing range may be arbitrary, and the printing may be performed all around. .
When the scale is to be printed darkly, the tubular object P is
It may be rotated more than one rotation and printed in the same position.

(5) In the embodiment, the print data of the thick line and the thin line are registered (stored) in the printer main body 51, and the thick line or the thin line is selected according to the detection of the proximity switch 71 or 72. However, the present invention is not limited to this. For example, the print head 52 is attached so as to be able to approach / separate from the tubular object P, and the gap between the print head 52 and the tubular object P can be changed, and printing is performed using the gap. The thickness of the line may be changed. (6) In the embodiment, the rotation range detection mechanism and the print head positioning mechanism include the proximity switch 43 and the like and the detector 41b.
Although a photoelectric switch or a limit switch may be used, a step motor or a servo motor is used for the drive motors 35 and 61, and the drive motors 35 and 6 are used.
1, the number of pulses at the time of driving is counted, and based on the number of pulses, a print range is set on the tubular object P and the print head 52
Can be positioned at the printing position.

(7) In the embodiment, the feed screw 62 and the ball screw 64 are used as the print head moving mechanism. However, for example, a mechanism using a chain and a sprocket, or a rack and a pinion may be used. (8) In the embodiment, printing is performed while the tubular material P is continuously rotated for printing efficiency, but printing may be performed by rotating the tubular material P intermittently. (9) In the embodiment, the detectors 73 and 74 are installed at an interval of 100 mm. However, by changing the installation interval of the detectors 73 and 74, the pitch for printing on the tubular object P can be freely changed.

[0040]

According to the first aspect of the present invention, printing can be efficiently performed around the outer periphery of a tubular object. And, for example, when a scale is printed on a tubular object, it is possible to provide a tubular object capable of easily performing a cutting operation to a predetermined length. In addition, since the print head moves in the axial direction of the tubular article and does not move the tubular article itself, the size of the printing apparatus can be reduced.

According to the second aspect of the present invention, printing can be performed at a fixed position in the rotation direction of the tubular object. Therefore, a straight line, trademark, product type, lot N
o. Can be prevented from being overprinted. In addition, the printing time is reduced and the amount of printing ink used is reduced by preventing overprinting at the same position, and at any position in the axial direction of the tubular object, the same position around the outer circumference is used. Printing can be performed. According to the third aspect of the present invention, the contents of a plurality of patterns can be printed on a tubular object.

[Brief description of the drawings]

FIG. 1 is a front view illustrating a printing apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view of the printing apparatus of FIG.

FIG. 3 is a diagram showing a rotary plate and a proximity sensor in detail;
(A) is a front view, (b) is an arrow view in the X direction in FIG. 1.

FIG. 4 is a flowchart illustrating an operation of the printing apparatus when printing on a tubular object.

FIG. 5 is a timing chart showing the relationship between the output of the proximity switch and the like and the passage of time.

FIG. 6 is a perspective view showing a tubular object on which a scale is printed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printing apparatus 2 Base frame 3 Side frame 11 Air chuck 11a Chuck claw 12 Tower 13 Cylinder 13a Moving shaft 13b Support plate 14 Pressing roller 15 Support frame 16a Roller mounting part 16b Support roller 17 shaft 18 Guide rod 19 Lifting cylinder 31 Rotating shaft 32 Bearing 33 Support frame 34 Pulley 35 Drive motor 36 Pulley 37 Belt 41 Rotating plate 41a, 41b Detector 42 Mounting plate 43, 44 Proximity sensor 51 Printer body 52 Print head 53 Bracket 61 Drive motor 62 Feed screw 63 Support member 64 Ball screw 65 Bracket 71, 72 Proximity switch 73, 74 Detector P Tubular object

Claims (3)

[Claims] 1. A tubular object support mechanism for restricting movement of a tubular object in a longitudinal axis direction and a direction perpendicular to the longitudinal axis direction and supporting the tubular object so as to be rotatable around the axis, and a tubular object support mechanism. A tubular object rotation mechanism that is connected to one end of the tubular object supported by the tubular object and that drives the tubular object to rotate around its axis; and in parallel to the axial direction of the tubular object supported by the tubular object support mechanism, A print head moving mechanism for moving a print head in a state close to the tubular object; and a print head positioning mechanism for positioning the print head of the print head moving mechanism at a predetermined print position. Positioning the print head at the printing position by a mechanism, and performing a predetermined printing around the outer circumference of the tubular object by rotating the tubular object by the tubular object rotation mechanism, Printing apparatus to print tubing which is characterized in that at predetermined intervals in the axial direction of the tubing. 2. The printing apparatus for a tubular object according to claim 1, further comprising: a reference position detection sensor that detects a reference position in a rotation direction of the tubular object rotation mechanism and a rotation range detection sensor that detects a predetermined range in the rotation direction. A rotation position detection mechanism having the rotation range when detecting that the print head of the print head positioning mechanism is positioned, and further detecting the reference position by the reference position detection sensor of the rotation position detection mechanism. A printing unit for printing on the predetermined range detected by the detection sensor. 3. The printing apparatus for a tubular article according to claim 1, wherein the print head positioning mechanism includes a plurality of positioning sensors and detectors corresponding thereto, one of which is provided to the print head. While being connected and moved, the other is arranged at a predetermined position along the moving direction of the print head of the print head moving mechanism, and positions the print head based on the detection of the positioning sensor, A printing device for a tubular object, wherein a different pattern or the same pattern content is printed for each of the detected positioning sensors.