TWI795047B - Printing device and printing method - Google Patents

Abstract

The present invention suppresses the positional deviation of the workpiece when printing on the workpiece.

The printing device of the present invention is provided with: a holder, which holds the workpiece; a rubber cylinder, which prints on the workpiece by rotating together with the workpiece; a first driving source, which rotates the workpiece; a second driving source, which drives the rubber cylinder rotation; and a control device that controls the first drive source and the second drive source; and the control device controls the first drive source and the second drive source in such a way that the circumferential speed of the workpiece is faster than the circumferential speed of the rubber roller.

Description

Printing device and printing method

The technology disclosed in the specification of this application relates to a printing technology.

There is an increasing demand for printing workpieces with rotationally symmetrical shapes such as cosmetic bottles. In order to print on the curved surface shape of such a workpiece, a method such as printing via a rubber roller with ink kept on the surface is useful.

[Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open No. 2009-101605

When printing on the workpiece as described above, the workpiece is in contact with the rubber roller on one side and rotates as it rotates on the other side. In this case, the workpiece will be pulled in the direction of rotation due to contact or friction with the rubber roller, and the position of the workpiece may shift. Due to the positional deviation of the workpiece will lead to It will cause the printing position to shift, so the printing quality will be reduced.

The technique disclosed in the specification of this application was completed in view of the above-mentioned problems, and it is a technique for suppressing positional displacement of a workpiece when printing on the workpiece.

The printing device according to the first aspect of the technology disclosed in the specification of this application includes: a holder for holding a rotationally symmetrical workpiece rotatably around an axis of rotational symmetry; The above-mentioned workpiece that the above-mentioned holder rotates contacts and one side rotates with the above-mentioned workpiece to print on the above-mentioned workpiece; the first drive source is used to rotate the above-mentioned workpiece held by the above-mentioned holder; the second drive source is used to rotate the above-mentioned workpiece held by the above-mentioned holder; For rotating the above-mentioned rubber roller; and a control device for controlling the driving of the first driving source and the driving of the second driving source; The driving of the first driving source and the driving of the second driving source are controlled so that the circumferential speed of the workpiece is faster than the circumferential speed of the rubber roller at the contact portion.

The printing device of the second aspect of the technology disclosed in the specification of this application is related to the printing device of the first aspect, wherein the control device uses the peripheral speed of the workpiece at the contact part to control the contact part Control the driving of the above-mentioned first driving source and the driving of the above-mentioned second driving source in such a way that the peripheral speed of the above-mentioned rubber roller is taken as a reference and is faster than that by 1% or more and 5% or less.

The printing device of the third aspect of the technology disclosed in the specification of this application, and the first or second aspect It is associated with such a printing device, which further includes: a backup cylinder, which is located on the upstream side of the contact portion in the rotation direction of the workpiece, and is used to contact the workpiece.

The printing device of the fourth aspect of the technology disclosed in the specification of this application is associated with the printing device of any one of the first to third aspects, and further includes: a hardening unit, which is located at a position opposite to the rotation direction of the above-mentioned workpiece The above-mentioned contact portion is more downstream, and is used to harden the ink printed on the above-mentioned workpiece.

The printing method of the fifth aspect of the technology disclosed in the specification of this application includes: the steps of holding a rotationally symmetrical workpiece rotatably around an axis of rotational symmetry; and contacting one side of the rotating workpiece with a rubber roller. The step of printing on the above-mentioned workpiece by rotating with the above-mentioned workpiece; and, the step of printing on the above-mentioned workpiece is such that the circumferential speed of the above-mentioned workpiece at the contact portion of the above-mentioned workpiece and the above-mentioned rubber roller is faster than that at the contact portion. The speed of the peripheral direction of the above-mentioned rubber roller is faster, while controlling the driving of the first driving source for rotating the above-mentioned workpiece and the driving of the second driving source for rotating the above-mentioned rubber roller, and at the same time, the above-mentioned workpiece is controlled. The steps of printing.

The printing method of the sixth aspect of the technology disclosed in the specification of this application is related to the printing method of the fifth aspect, wherein the step of printing the workpiece is based on the circumferential speed of the workpiece at the contact portion Based on the circumferential speed of the above-mentioned rubber roller at the above-mentioned contact portion, it is faster than that by 1% or more and 5% or less, while controlling the driving of the first driving source and the driving of the second driving source, and The step of printing on the above workpiece.

According to at least the first and fifth aspects of the technology disclosed in the specification of this application, since the peripheral speed of the workpiece is faster than that of the rubber roller, the rotating workpiece will experience frictional resistance on the opposite side of the rotation direction. Therefore, when printing on a workpiece, positional deviation of the workpiece can be suppressed.

Furthermore, the purpose, features, aspects, and advantages related to the technology disclosed in the specification of this application can be further clarified from the detailed description and accompanying drawings shown below.

1: Plate unit

2: Ink filling unit

3: transfer unit

4: hardening unit

4A: Hardened unit

8: bottle

9: Control device

11: Carrier

12: version

21: Nozzle

22: Ink supply part

30: rubber roller

31: Blanket trunk

32: Blanket

33: motor

80: side

81: Mouth

82: buttocks

83: bottom

100: printing device

101: printing unit

300: holder

309: axis of rotation

310: Keep the body

311: rotation holding part

312: shaft part

313: Keep the components

314: Shaft

315: Self-aligning bearing

319: Knob component

320: Keep the body

321: rotation holding part

322: Shaft

323: Contact components

324: spring push component

325: Knob component

330: keep the body part

331: support department

332: support department

333: abutment

370: spare roller

370a: spare roller

370b: spare roller

370c: spare roller

370d: spare roller

380: power transmission mechanism

500: Rotary drive mechanism

501: motor

800: Axis of rotational symmetry

A1: virtual circle

P: contact part

V1: Circumferential speed of the rubber roller 30

V2: Circumferential speed of bottle 8

V3: Circumferential speed of the rubber roller 30

V4: Circumferential speed of bottle 8

FIG. 1 is a diagram schematically showing an example of the configuration of a printing device according to the embodiment.

Fig. 2 is a diagram schematically showing an example of the configuration of a printing device according to the embodiment.

Fig. 3 is a side view schematically showing an example of the structure of the holder holding the bottle.

Fig. 4 is a diagram showing an example of a state in which a bottle is held by a plurality of spare rollers.

Fig. 5 is a diagram schematically showing a control system for controlling the printing device.

Fig. 6 is a diagram schematically showing the rotation of the rubber roller and the bottle according to the embodiment.

Fig. 7 is a diagram schematically showing the rotation of the rubber roller and the bottle according to the embodiment.

Hereinafter, embodiments will be described with reference to the attached drawings. In the following embodiments, detailed features and the like are shown for the purpose of explaining the technology, but these are merely examples, and not all of them are necessary for implementing the embodiments.

In addition, the drawings are for schematic display, and for the convenience of explanation, the configurations are appropriately omitted in the drawings. or simplified composition. In addition, since the size and positional relationship of components shown in different drawings are not always accurate, they can be changed appropriately. In addition, even in drawings such as plan views that are not cross-sectional views, hatching may be added to facilitate understanding of the contents of the embodiments.

In addition, in the description shown below, the same symbols are attached to the same constituent elements, and the names and functions thereof are also the same. Therefore, to avoid repetition, such related detailed descriptions are sometimes omitted.

In addition, in the explanations described below, when a certain constituent element is described as "having", "including" or "having" a certain constituent element, etc., unless otherwise specified, it is not an exclusive expression excluding the existence of other constituent elements.

In addition, in the description below, even when ordinal numbers such as "first" or "second" are used, these terms are used expediently for the sake of easy understanding of the content of the embodiment, and are not limited to those that may be generated by these ordinal numbers. order etc.

<implementation form>

The printing apparatus and printing method related to this embodiment will be described below.

<About the configuration of the printing device>

1 and 2 are diagrams schematically showing an example of the configuration of a printing apparatus 100 according to this embodiment. In FIGS. 1 and 2 , a bottle 8 is shown as an example of a rotationally symmetrical workpiece (including a cylindrical shape and a polygonal shape 5 ), and a side surface 80 of the bottle 8 is shown as an example of a side surface of the workpiece.

The bottle 8 conveyed by the conveyance part not shown is desirably held in the holder 300 detachably. Also, the form of the holder 300 is not limited to those shown in FIGS. 1 and 2 , as long as it can hold the bottle 8 .

The printing device 100 includes at least one printing unit 101 and a control device 9 . The printing unit 101 prints, for example, monochrome on the side 80 of the bottle 8 . When a plurality of printing units 101 are installed in the printing device 100, multi-color printing (including two-color printing) is realized by making each printing unit 101 perform single-color printing of mutually different colors.

The printing unit 101 of the printing device 100 is driven by the control device 9 .

Here, the control device 9 may include: including, for example, a hard disk drive (Hard disk drive, namely HDD), a random access memory (random access memory, namely RAM), a read only memory (read only memory, namely ROM) , flash memory, volatile or non-volatile semiconductor memory, magnetic disk, flexible disk, optical disk, compact disk, mini-disc or DVD (Digital versatile disc: digital versatile disc) and other memory (memory media ) memory device; processing such as a central processing unit (CPU) that executes a program stored in the memory device, an external CD-ROM, an external DVD-ROM, or an external flash memory, etc. Circuits; input devices such as a mouse, keyboard, touch panel, or various switches that can input information; and output devices such as monitors, liquid crystal display devices, or lamps that can output information.

The printing unit 101 includes a platen unit 1 , an ink filling unit 2 and a transfer unit 3 . In addition, the printing unit 101 may include a curing unit 4 . These structures are aligned and arranged in the order described above from the Y-axis positive direction side toward the Y-axis negative direction side.

The bottle 8 delivered to each printing unit 101 approaches and leaves the transfer unit 3 and the hardening unit 4 while being held in the holder 300 . FIG. 1 shows a state in which the bottle 8 is separated from the transfer unit 3 and the hardening unit 4 while being held in the holder 300 . On the other hand, FIG. 2 shows a state where the bottle 8 approaches the transfer unit 3 and the hardening unit 4 in a state held by the holder 300 .

In the printing unit 101 , firstly, an ink pattern using photocurable ink is formed by the stage unit 1 and the ink filling unit 2 .

Thereafter, the ink pattern is transferred to the transfer unit 3 . Furthermore, the ink pattern is transferred from the transfer unit 3 to the side surface 80 of the bottle 8 .

Thereafter, the ink transferred to the side surface 80 of the bottle 8 is cured by irradiation with light from the curing unit 4 . In addition, the method of curing the ink on the side surface 80 of the bottle 8 by the curing unit 4 is not limited to light irradiation such as ultraviolet radiation, and may be a method of curing the ink by heat treatment or the like, for example.

The bottle 8 in the holder 300 is held rotatably around the axis of rotational symmetry of the side surface 80 . Any of the above-mentioned steps performed in the printing unit 101 is executed with the bottle 8 held in the holder 300 .

In the above-mentioned steps, the formation of the ink pattern and the transfer of the ink pattern to the transfer unit 3 are, for example, in the state where the bottle 8 is separated from the transfer unit 3 and the hardening unit 4 (that is, the state shown in FIG. 1 ), or the bottle 8 is executed during the movement of the plurality of printing units 101 among each other.

Also, in the above steps, the transfer of the ink pattern to the side 80 of the bottle 8 and the hardening of the ink are carried out in a state where the bottle 8 is close to the transfer unit 3 and the hardening unit 4 (ie the state shown in FIG. 2 ).

In the printing device 100, after the printing unit 101 executes the above steps, the bottle 8 is transported from the printing unit 101 in a state of being held in the holder 300, and the ink transferred to the side surface 80 of the bottle 8 is further hardened (formally hardened). In this case, the curing of the ink by the printing unit 101 is performed as temporary curing for each single-color printing.

The plate stage unit 1 includes a stage 11 and a plate 12 . The plate 12 is disposed on the surface of the stage 11 on the positive side of the Z-axis. The plate 12 is a plate (such as an intaglio plate) for forming ink patterns. The stage 11 can move in any direction of XYZ direction, and can also move in the direction of rotation around the Z axis. Such movement is performed using, for example, a crossed roller bearing mechanism.

The stage 11 can move from the positive side of the Y-axis to the negative direction of the Y-axis when viewed from the ink filling unit 2 and the transfer unit 3 , and can approach the transfer unit 3 through the ink filling unit 2 . The stage 11 can also move in the positive direction of the Y-axis, and can leave the transfer unit 3 .

The ink filling unit 2 includes a nozzle 21 and an ink supply unit 22 . The ink supply unit 22 supplies photocurable ink (hereinafter also simply referred to as “ink”) to the nozzles 21 .

The photocurable ink contains, for example, a pigment as a developer, a polymer material (including at least one of monomers and oligomers) forming a firm polymer layer by polymerization, and a chemical reaction that occurs when light is irradiated. A photopolymerization initiator that changes the generated active species to promote the polymerization reaction of polymer materials.

When the stage 11 moves in the negative direction of the Y-axis so that the nozzle 21 and the plate 12 face each other in the Z-axis direction, the ink supplied to the nozzle 21 is ejected from the outlet provided at the lower end of the nozzle 21 and then coated on the plate 12 The surface on the positive side of the Z-axis (hereinafter also referred to as the "upper surface").

For example, if the plate 12 is a gravure plate, the upper surface of the plate 12 is scraped by a scraper (not shown). In this way, the ink is filled in the recesses of the plate 12 and the ink outside the recesses is removed, thereby forming an ink pattern on the plate 12 .

The plate 12 on which the ink pattern is formed moves further in the negative direction of the Y axis and approaches the transfer unit 3 .

The transfer unit 3 includes a rubber roller 30 and a motor 33 . The motor 33 is driven by the control of the control device 9 to rotate the rubber roller 30 .

The rubber cylinder 30 includes a blanket body 31 and a blanket 32 . The blanket trunk portion 31 is, for example, a metal cylinder. The blanket 32 is wound on the surface of the blanket body 31 . The blanket 32 has a cylindrical shape. As the material of the blanket 32, it is preferable to follow the shape of the substrate and deform somewhat when pressed by the substrate, for example, silicone rubber, PDMS (Polydimethylsiloxane: poly Dimethicone), NBR (nitrole butadiene rubber: nitrile rubber) or EPDM (Ethylene-Propylene-Diene tripolymer: ethylene-propylene-diene rubber), etc.

The rubber roller 30 is rotatably supported around a rotation axis indicated by a chain line in FIGS. 1 and 2 .

The surface of the blanket 32 allows ink to adhere and be fixed. When the stage 11 moves in the Y-axis negative direction so that the rubber cylinder 30 and the plate 12 face each other in the Z-axis direction, the surface of the blanket 32 contacts the upper surface of the plate 12 . And, the ink pattern formed on the plate 12 is transferred to the surface of the blanket 32 (transferred).

The bottle 8 approaches the transfer unit 3, and the side surface 80 of the bottle 8 contacts the blanket 32, and then the blanket 32 and the side surface 80 are in contact with each other while rotating in opposite directions.

Thereby, the ink pattern transferred to the blanket 32 is further transferred to the side surface 80 . From the viewpoint of this transfer, it is desirable that the height of the unevenness that can be produced on the side surface 80 of the bottle 8 be smaller than the thickness of the blanket 32 .

The blanket 32 functions as an intermediate transfer body for temporarily adhering and fixing the ink pattern to be transferred to the side surface 80 of the bottle 8 . The blanket 32 is formed of elastic resin material such as silicone resin.

If the bottle 8 rotates more than one turn during this transfer, it is assumed that the ink pattern on the side surface 80 of the bottle 8 is transferred to the blanket 32 (hereinafter also referred to as "reverse printing"). Reverse printing will disturb the side 80 ink of bottle 8 water pattern. It is desirable to increase the viscosity of the ink transferred to the side 80 to reduce reverse printing, for example, as follows.

The self-curing unit 4 irradiates light (ultraviolet rays) to the side surface 80 of the bottle 8 immediately after the ink pattern has been transferred from the blanket 32 . If a plurality of printing units 101 are installed in the printing device 100, a part of the polymer material contained in the ink is polymerized to increase the viscosity of the ink, but the self-curing unit 4 is irradiated with light under the condition that the entire ink does not harden. (ultraviolet). The condition is set, for example, based on the intensity of the light.

Reverse printing is reduced by increasing the viscosity of the ink to reduce adhesion from the side 80 of the bottle 8 to the blanket 32 . This reduction in adhesion is also desirable from the viewpoint of avoiding contamination of the holder 300 .

FIG. 3 is a side view schematically showing an example of the structure of the holder 300 holding the bottle 8 . As shown in the example of FIG. 3 , the holder 300 holds the bottle 8 rotatably around a rotation axis 309 along the X-axis direction. The bottle 8 is held by the holder 300 with the axis of rotational symmetry 800 transverse to the axis of rotation 309 . Hereinafter, the circumferential direction and the radial direction with respect to the rotation axis 309 are also simply referred to as the circumferential direction and the radial direction, respectively.

As shown in the example of FIG. 3 , the holder 300 includes a holding mechanism 310 and a holding body portion 330 .

The holding mechanism 310 holds one end of the bottle 8 rotatably about the rotation axis 309 . One end of the bottle 8 held by the holding mechanism 310 is an end on one side of the bottle 8 on the axis of rotational symmetry 800 .

The holding mechanism 310 includes a rotation holding portion 311 . The rotation holding portion 311 includes a shaft portion 312 rotatably supported around the rotation axis 309 , and a holding member 313 connected to an end portion of the shaft portion 312 .

The holding member 313 holds one end of the bottle 8 detachably. By rotating the rotation holding part 311 around the rotation axis 309 in a state where the holding member 313 holds one end of the bottle 8 , the bottle 8 held by the rotation holding part 311 is also rotated around the rotation axis 309 .

In the example of FIG. 3 , the holder 300 includes a rotation drive mechanism 500 . The rotation driving mechanism 500 is controlled by the control device 9 to give the rotation holding part 311 a driving force for rotating the rotation holding part 311 around the rotation axis 309 . The rotation drive mechanism 500 includes a motor 501 , and the rotation force of the motor 501 is transmitted to the rotation holding unit 311 , so that the rotation holding unit 311 rotates around the rotation axis 309 .

In the example shown in FIG. 3 , the rotation drive mechanism 500 transmits the rotation force to the rotation holding unit 311 via the power transmission mechanism 380 . The power transmission mechanism 380 includes various mechanical elements such as gears, pulleys, and belts, and transmits the rotational force from the rotational driving mechanism 500 to the rotational holding unit 311 . The power transmission mechanism 380 may include a clutch, for example, and may switch between a connection state that transmits the rotational force from the rotational driving mechanism 500 to the rotational holding portion 311 and a state that does not transmit the rotational force from the rotational driving mechanism 500 to the rotational holding portion 311. off state.

The shaft portion 312 includes a shaft 314 . The shaft 314 is disposed along the axis of rotation 309 and is rotatably supported about the axis of rotation 309 relative to the holding body portion 330 .

The holding body part 330 includes a flat base 333 , a support part 331 , and a support part 332 . The base 333 has a flat plate shape perpendicular to the Z-axis direction. The support portion 331 is provided from the base 333 toward the positive Z-axis direction on the positive X-axis side. The support portion 332 is provided at a position away from the support portion 331 in the negative X-axis direction, and is provided in the positive Z-axis direction from the base 333 .

A holding member 313 is provided at the end of the shaft 314 on the negative side of the X-axis, and a knob member 319 is provided at the end of the shaft 314 on the positive side of the X-axis.

The holding member 313 detachably holds the mouth portion 81 at one end of the bottle 8 . The bottle 8 includes a mouth 81 , a trunk 82 , and a bottom 83 . The trunk portion 82 has a cylindrical shape, and its outer side surface 80 is rotationally symmetrical with respect to the axis of rotational symmetry 800 . The bottom portion 83 closes the opening on the X-axis negative direction side of the trunk portion 82 . The mouth portion 81 is connected to the opening on the positive side of the X-axis of the trunk portion 82 , and has a tapered cylindrical shape whose diameter decreases as the distance from the trunk portion 82 decreases. A male thread portion is formed on the outer side of the front end of the mouth portion 81 . The holding member 313 has the same shape as the bottle cap.

In the state where the mouth 81 and the holding member 313 are not connected, the operator holds the bottle 8 to restrict the rotation of the bottle 8 and rotates the knob member 319 in a direction in which the mouth 81 and the holding member 313 are screwed together. By this rotation, the mouth part 81 and the holding member 313 are screwed together. And, the mouth part 81 and the holding member 313 are connected by this screwing. Through this connection, the shaft 314 and the bottle 8 are connected in the X-axis direction.

In the state where the holding member 313 is connected to the bottle 8, the operator restricts the rotation of the bottle 8 while simultaneously Then, the knob member 319 is rotated in a direction to unscrew the mouth portion 81 and the holding member 313 . By such rotation, the holding member 313 is removed from the mouth portion 81, and the connection between the shaft 314 and the bottle 8 is released.

As shown in FIG. 3 , the shaft portion 312 may include a self-aligning bearing 315 . The self-aligning bearing 315 rotatably supports the shaft 314 on the holding body part 330 . Specifically, the shaft 314 is fixed through the inner ring of the self-aligning bearing 315 , and the outer ring of the self-aligning bearing 315 is fixed to the holding body part 330 (support part 331 ). In addition, the fixing of the outer ring of the self-aligning bearing 315 and the supporting part 331 is omitted in FIG. 3 . The inner ring of the self-aligning bearing 315 can rotate freely and tilt freely relative to the outer ring. Therefore, even if the shaft 314 is bent relative to the rotation axis 309 , the inner ring of the self-aligning bearing 315 will still tilt and displace relative to the outer ring according to the bending of the shaft 314 , so the shaft 314 can keep bending and rotate.

As shown in FIG. 3 , the holder 300 may be provided with a spare roller 370 . The backup roller 370 is disposed radially outward of the bottle 8 and is in contact with the side surface 80 of the bottle 8 . In the example shown in Figure 3, only one spare roller 370 is shown, however, a plurality of spare rollers may be provided. A plurality of backup rollers contact the sides 80 of the bottles 8 at different positions in the circumferential direction.

As shown in FIG. 3 , the holder 300 may be provided with a holding mechanism 320 . The holding mechanism 320 includes a rotation holding portion 321 . The rotation holding part 321 rotatably around the rotation axis 309 pushes the other end of the bottle 8 (here, the bottom 83 ) to the positive side of the X-axis.

The rotation holding part 321 includes a shaft 322 , a contact member 323 , and an urging member 324 .

The shaft 322 is arranged along the rotation axis 309 and arranged in such a manner as to coincide with the axis of the shaft portion 312 (ie, the axis of the shaft 314 ). The shaft 322 is rotatably supported about the rotation axis 309 with respect to the support part 332, and is movably supported with respect to the support part 332 in the X-axis direction.

A contact member 323 that contacts the bottom 83 of the bottle 8 is provided at the end of the shaft 322 on the positive X-axis side. A knob member 325 is provided at the end of the shaft 322 on the negative X-axis side.

The dimension of the contact member 323 when viewed along the axis of rotation 309 is larger than that of the shaft 322 . The spring pushing member 324 is disposed between the contact member 323 and the wall surface of the support portion 332 on the positive side of the X-axis. The push member 324 pushes the contact member 323 toward the bottom 83 of the bottle 8 . For example, the urging member 324 includes a spring inserted into the shaft 322 . The contact member 323 is pushed toward the bottom 83 side by the push member 324 , and its push force is transmitted to the bottom 83 of the bottle 8 through the contact member 323 . That is, the contact member 323 springs and pushes the bottom 83 of the bottle 8 toward the mouth 81 side. Thereby, the bottle 8 is clamped by the holding mechanism 310 and the holding mechanism 320 in the X-axis direction.

The operator can resist the elastic thrust of the elastic pushing member 324 while moving the knob member 325 in the negative direction of the X axis, so that the contact member 323 is separated from the bottom 83 . Disengaging the contact member 323 from the bottom portion 83 facilitates the process of detaching the holding member 313 from the mouth portion 81 .

Fig. 4 is a diagram showing an example of a state in which the bottle 8 is held by a plurality of spare rollers. In the example of FIG. 4, the spare roller 370a and the spare roller 370b are provided in the holder 300 as a plurality of spare rollers.

The backup roller 370 a and the backup roller 370 b have a shape of a rotating body whose axial direction is the X-axis direction parallel to the rotation axis 309 , and are rotatably supported by the support part 331 and the support part 332 . The backup roller 370a and the backup roller 370b are rotatably supported around an axis parallel to the rotation axis 309 .

In the example of FIG. 4 , the spare cylinder 370 a is arranged on the opposite side of the blanket 32 , that is, on the negative side of the Y axis, with the bottle 8 sandwiched therebetween so as to press the side surface 80 of the bottle 8 against the blanket 32 of the printing unit 101 . Displacement of the bottle 8 in the Y-axis negative direction is restricted by making the backup roller 370a contact the side surface 80 of the bottle 8 from the Y-axis negative direction side.

Moreover, the backup roller 370b is arrange|positioned at the position lower than the backup roller 370a in the Z-axis direction. By contacting the side surface 80 of the bottle 8 from the negative direction of the Z-axis with the backup roller 370b, the displacement of the bottle 8 in the negative direction of the Z-axis, that is, the direction of gravity, is restricted.

As above, by making the side surface 80 of the bottle 8 contact the backup roller 370 (or the backup roller 370a and the backup roller 370b) when the bottle 8 rotates, so that the rotational symmetry axis 800 of the trunk portion 82 of the bottle 8 is along the rotation axis 309 , adjust the holding posture of bottle 8. In other words, displacement of the bottle 8 can be suppressed by the spare roller. In addition, more than 3 spare rollers can also be set. Displacement of the bottle 8 can be effectively suppressed by arranging a plurality of spare rollers on the imaginary circle A1 centered on the rotation axis 309 .

FIG. 5 is a diagram schematically showing a control system for controlling the printing device 100 . As shown in the example of FIG. 5 , the control device 9 of the printing device 100 controls the driving of each driving unit of the printing device 100 .

Specifically, the control device 9 controls the movement of the stage 11 of the printing unit 101 , the ink supply operation from the ink supply unit 22 , the driving of the motor 33 for rotating the rubber cylinder 30 , and the like. In addition, the control device 9 controls the driving of the motor 501 for rotating the rotation holding portion 311 of the holder 300 and the like.

<About the operation of the printing device>

Next, the operation of the printing device according to this embodiment will be described with reference to FIG. 6 and FIG. 7 . 6 and 7 are diagrams schematically showing the rotation of the rubber roller 30 and the bottle 8 according to this embodiment.

In FIG. 6 , the squeegee 30 is in contact with the bottle 8 , and corresponds, for example, to the action of transferring the ink pattern of the squeegee 30 to the side 80 of the bottle 8 .

The rubber cylinder 30 is rotated by driving the motor 33 (see FIGS. 1 and 2 ) under the control of the control device 9 . In this case, the peripheral speed V1 of the outer peripheral surface of the rubber roller 30 can be adjusted by the control of the control device 9 . In FIG. 6 , the direction of the velocity V1 is toward the positive direction of the Z-axis at the position where the rubber roller 30 contacts the bottle 8 (the contact portion P).

Also, by driving the motor 501 (see FIG. 3 ) under the control of the control device 9 , the rotation holding portion 311 holding the bottle 8 in the holder 300 rotates. As the rotation holding part 311 rotates, the bottle 8 held by the rotation holding part 311 also rotates. In this case, the peripheral speed V2 of the outer peripheral surface (side surface 80 ) of the bottle 8 can be adjusted by the control of the control device 9 . In Figure 6, the direction of velocity V2 is in the rubber The position where the roller 30 is in contact with the bottle 8 (the contact portion P) faces the positive direction of the Z-axis.

At this time, the control device 9 adjusts the output of the corresponding driving parts (that is, the motor 501 and the motor 33) in such a way that the circumferential speed V2 of the bottle 8 is faster than the circumferential speed V1 of the rubber cylinder 30 if there is no frictional resistance. .

However, the outer peripheral surface of the rubber roller 30 and the outer peripheral surface of the bottle 8 are in contact with each other at the contact portion P, and a static friction force is generated at the contact portion P so as not to slip. In other words, the control device 9 does not deviate between the rubber roller 30 and the bottle 8 in the mutual rotation direction through the static friction force of the contact part P, and then the deformation (such as warping or stretching) of the outer peripheral surface of the rubber roller 30 . Within the range, adjust the output of each drive unit (ie, the motor 501 and the motor 33).

As a range in which the rubber roller 30 and the bottle 8 do not deviate in the mutual rotation direction at the contact portion P, it is assumed that, for example, the peripheral velocity V2 of the bottle 8 is increased by 1% or more based on the peripheral velocity V1 of the rubber roller 30 And the range of 5% or less (that is, the speed V2 is 101% or more and 105% or less with respect to the speed V1).

As mentioned above, since the peripheral speed V2 of the bottle 8 is faster than the peripheral speed V1 of the rubber roller 30, the rotating bottle 8 will be subjected to frictional resistance on the opposite side of the rotation direction. That is, the outer peripheral surface (side surface 80) of the rotating bottle 8 is drawn toward the outer peripheral surface of the rubber roller 30 adjusted to a peripheral speed slightly slower than the peripheral speed V2 of the bottle 8, and is drawn to the opposite side of the rotation direction.

In this way, the bottle 8 that may be generated when the bottle 8 rotates with the rotation of the rubber drum 30 can be suppressed. The position of the rubber roller 30 is drawn and shifted toward the rotation direction of the rubber roller 30 (in the case of FIG. 6, it is shifted toward the positive direction of the Z axis).

Also, as shown in the example of FIG. 6, a spare roller 370b may be provided on the upstream side (in the case of FIG. 6, the Z-axis negative direction side) of the contact portion P in the rotation direction of the bottle 8. By disposing the backup roller 370b at such a position, it is also possible to suppress the deviation of the bottle 8 due to the frictional resistance between the outer peripheral surface of the rubber roller 30 and being drawn to the opposite side of the rotation direction (toward Z in the situation of FIG. 6 ). offset in the negative direction of the axis).

Furthermore, a spare roller 370a may be provided on the side opposite to the side in contact with the rubber roller 30 of the bottle 8 (in the case of FIG. 6 , the Y-axis negative direction side). By arranging the backup roller 370a at such a position, it is also possible to suppress the deviation of the bottle 8 from being pushed out in the negative direction of the Y-axis due to contact with the outer peripheral surface of the rubber roller 30 .

Also, as shown in the example of FIG. 6 , the hardening unit 4 may be provided on the downstream side of the contact portion P in the rotation direction of the bottle 8 (in the positive direction of the Z axis in the case of FIG. 6 ). By arranging the curing unit 4 at such a position, the ink that has just been printed on the bottle 8 at the contact portion P can be cured by ultraviolet irradiation or the like. In this way, reattachment of ink to the outer peripheral surface of the rubber cylinder 30 can be suppressed.

In addition, since the bottle 8 will be drawn to the opposite side of the rotation direction due to the frictional resistance between the outer peripheral surface of the rubber roller 30, the downstream side of the contact part P does not need a position for restraining the bottle 8 like the backup roller. The composition of the offset. Therefore, it is possible to secure a space for disposing the hardening unit 4 on the downstream side of the contact portion P in the rotation direction of the bottle 8 .

Also in FIG. 7 , the rubber roller 30 is in contact with the bottle 8 , and for example corresponds to the action of transferring the ink pattern of the rubber roller 30 to the side surface 80 of the bottle 8 .

The rubber cylinder 30 is rotated by driving the motor 33 (see FIGS. 1 and 2 ) under the control of the control device 9 . In this case, the peripheral speed V3 of the outer peripheral surface of the rubber roller 30 can be adjusted by the control of the control device 9 . The situation in Fig. 7 is different from that in Fig. 6. The direction of the velocity V3 is toward the negative direction of the Z-axis at the position where the rubber roller 30 contacts the bottle 8 (contact portion P).

Also, by driving the motor 501 (see FIG. 3 ) under the control of the control device 9 , the rotation holding portion 311 holding the bottle 8 in the holder 300 rotates. As the rotation holding part 311 rotates, the bottle 8 held by the rotation holding part 311 also rotates. In this case, the peripheral speed V4 of the outer peripheral surface (side surface 80 ) of the bottle 8 can be adjusted by the control of the control device 9 . The situation in Fig. 7 is different from that in Fig. 6. The direction of the velocity V4 is toward the negative direction of the Z-axis at the position where the rubber roller 30 contacts the bottle 8 (contact portion P).

At this time, the control device 9 adjusts the output of the corresponding driving parts (that is, the motor 501 and the motor 33) in such a way that the circumferential speed V4 of the bottle 8 is faster than the circumferential speed V3 of the rubber cylinder 30 if there is no frictional resistance. .

However, the outer peripheral surface of the rubber roller 30 and the outer peripheral surface of the bottle 8 are in contact with each other at the contact portion P, and a static friction force is generated at the contact portion P so as not to slip.

As mentioned above, since the peripheral velocity V4 of the bottle 8 is faster than the peripheral velocity V3 of the rubber roller 30, the rotating bottle 8 will be subjected to frictional resistance on the opposite side of the rotation direction. That is, the outer peripheral surface (side surface 80) of the rotating bottle 8 is drawn toward the outer peripheral surface of the rubber roller 30 adjusted to a peripheral speed slightly slower than the peripheral speed V4 of the bottle 8, and is drawn to the opposite side of the rotation direction.

In this way, the position of the bottle 8 that may occur when the bottle 8 rotates with the rotation of the rubber roller 30 can be suppressed, and the position of the bottle 8 is pulled to the direction of rotation of the rubber roller 30 and shifted (in the case of FIG. 7, it is shifted in the negative direction of the Z axis). phenomenon.

Also, as shown in the example of FIG. 7, a spare roller 370d may be provided on the upstream side (in the case of FIG. 7, the Z-axis positive direction side) of the contact portion P in the rotational direction of the bottle 8. By arranging the backup roller 370d at such a position, it is also possible to suppress the deviation caused by the bottle 8 being drawn to the opposite side of the rotation direction due to the frictional resistance between the outer peripheral surface of the rubber roller 30 (in the case of FIG. 6 to Z). positive axis offset).

Furthermore, a spare roller 370c may be provided on the side opposite to the side of the bottle 8 that is in contact with the rubber roller 30 (in the case of FIG. 6, the side in the negative direction of the Y axis). By arranging the spare roller 370c at such a position, it is also possible to suppress the deviation of the bottle 8 from being pushed out in the negative direction of the Y-axis due to contact with the outer peripheral surface of the rubber roller 30 .

Also, as shown in the example of FIG. 7 , it is also possible to set the contact portion P on the downstream side (in the case of FIG. 6 , the side of the negative direction of the Z-axis) in the rotation direction of the bottle 8 to transfer the ink to the bottle. The hardening unit 4A of ink hardening on the side of 8. By arranging the hardening unit 4A at such a position, it is possible to Shots etc. harden the ink that has just been printed on the bottle 8 at the contact portion P. In this way, reattachment of ink to the outer peripheral surface of the rubber cylinder 30 can be suppressed.

<About the effects of the embodiment described above>

Next, an example of the effect produced by the embodiment described above will be shown. In addition, in the following description, the effects are described based on the specific configurations exemplified in the embodiments described above, but within the scope of producing the same effects, other specific configurations exemplified in the specification of this application can also be substituted. That is, in the following, for the sake of convenience, only one of the corresponding specific configurations may be described as a representative, but other specific configurations corresponding to the typical specific configurations may be substituted.

According to the embodiment described above, the printing apparatus includes the holder 300 , the rubber cylinder 30 , the first drive source, the second drive source, and the control device 9 . Here, the first drive source corresponds to, for example, the motor 501 or the like. Moreover, the 2nd drive source corresponds to the motor 33 etc., for example. The holder 300 holds a workpiece which is a rotationally symmetrical body rotatably around a rotationally symmetrical axis. Here, the workpiece corresponds to, for example, the bottle 8 or the like. The rubber roller 30 is in contact with the bottle 8 rotating in the holder 300 . Moreover, the rubber cylinder 30 prints on the bottle 8 by rotating together with the bottle 8 . The motor 501 rotates the bottle 8 held in the holder 300 . The motor 33 rotates the rubber cylinder 30 . The control device 9 controls the driving of the motor 501 and the driving of the motor 33 . The control device 9 makes the circumferential speed V2 (or speed V4) of the bottle 8 at the contact portion P of the bottle 8 and the rubber roller 30 faster than the circumferential speed V1 (or speed V3) of the rubber roller 30 at the contact portion P. In this way, the driving of the motor 501 and the driving of the motor 33 are controlled.

According to such constitution, because the circumferential speed of bottle 8 is faster than the circumferential speed of rubber roller 30, Fast, so the rotating bottle 8 will be subjected to frictional resistance on the opposite side of the rotation direction. Therefore, when the bottle 8 is printed, the positional displacement of the bottle 8 can be suppressed. That is, since the outer peripheral surface of the rotating bottle 8 will be drawn towards the outer peripheral surface of the rubber roller 30 at a peripheral speed slightly slower than the peripheral speed V2 of the bottle 8, it will be drawn to the opposite side of the rotation direction, so the bottle can be restrained. The phenomenon that the position of 8 is pulled and deviated in the direction of rotation of the rubber roller 30. Also, by making the bottle 8 itself rotate autonomously, the reproducibility of the rotation of the bottle 8 can be further improved compared to the case where the bottle 8 rotates with the rotation of the rubber drum 30 .

In addition, the same effects can also be produced when appropriately adding other configurations exemplified in the specification of this application to the above-mentioned configurations, that is, when appropriately adding other configurations in the specification of this application that are not mentioned above.

Also, according to the embodiment described above, the control device 9 is based on the circumferential speed V2 (or speed V4) of the bottle 8 at the contact part P place, and the circumferential speed V1 (or speed V3) of the rubber roller 30 at the contact part P place. ) as a reference and faster than it by 1% or more and 5% or less, the driving of the motor 501 and the driving of the motor 33 are controlled. According to such a configuration, frictional resistance can be generated on the outer peripheral surface of the bottle 8 within the range where the rubber roller 30 and the bottle 8 do not deviate in the mutual rotation direction.

Also, according to the embodiment described above, the printing device is provided with the backup cylinder 370b (or backup cylinder 370d ) positioned on the upstream side of the contact portion P in the rotation direction of the bottle 8 and used to contact the bottle 8 . According to such a structure, it is also possible to suppress the deviation caused by the bottle 8 being pulled to the opposite side of the rotation direction due to the frictional resistance between the rubber drum 30 and the outer peripheral surface (in the case of FIG. ).

Also, according to the embodiment described above, the printing device includes the hardening unit 4 (or hardening unit 4A) that hardens the ink just printed on the bottle 8 and is located on the downstream side of the contact portion P in the rotation direction of the bottle 8 . According to such a structure, the ink immediately after printing on the bottle 8 in the contact part P can be cured by ultraviolet irradiation etc. FIG. In this way, reattachment of ink to the outer peripheral surface of the rubber cylinder 30 can be suppressed.

According to the embodiment described above, in one printing method, the bottle 8 which is a rotationally symmetrical body is held so as to be rotatable about the axis of rotational symmetry. And, printing is performed on the bottle 8 by bringing the rubber cylinder 30 into contact with the rotating bottle 8 and rotating together with the bottle 8 . Here, the step of printing the bottle 8 is based on the fact that the circumferential speed V2 (or speed V4) of the bottle 8 at the contact portion P of the bottle 8 and the rubber cylinder 30 is faster than the circumferential speed of the rubber cylinder 30 at the contact portion P. The faster mode of speed V1 (or speed V3 ) controls the driving of the motor 501 for rotating the bottle 8 and the driving of the motor 33 for rotating the rubber cylinder 30 , while printing on the bottle 8 .

According to such a structure, since the peripheral speed of the bottle 8 is faster than that of the rubber roller 30, the rotating bottle 8 will receive frictional resistance on the opposite side of the rotation direction. Therefore, when the bottle 8 is printed, the positional displacement of the bottle 8 can be suppressed.

In addition, the order in which each process is performed can be changed unless there is a particular limitation.

In addition, the same effects can be produced when appropriately adding other configurations exemplified in the specification of the application to the above configurations, that is, appropriately adding other configurations in the specification of the application that are not mentioned in the configurations above.

<Modifications of the Embodiments Described above>

In the embodiments described above, the material, material, size, shape, relative arrangement relationship, or implementation conditions of each constituent element may also be described, but these are examples of all aspects and are not limiting.

Therefore, within the technical scope disclosed in the specification of this application, countless modifications and equivalents that are not illustrated are conceived. For example, the case where at least one constituent requirement is changed includes the case of addition or the case of omission.

In addition, in the embodiments described above, when the name of a material and the like are described without specifying in particular, the material contains other additives, such as an alloy, unless there is a contradiction.

In addition, each constituent element described in the above-described embodiment can be considered as software or firmware, or as hardware corresponding to it. In the concepts of the two, each constituent element is referred to as a "part". Or "processing circuit" (circuitry), etc.

4: hardened unit

8: bottle

30: rubber roller

31: Blanket trunk

32: Blanket

80: side

309: axis of rotation

370a: spare roller

370b: spare roller

800: Axis of rotational symmetry

A1: virtual circle

P: contact part

V1: Circumferential speed of the rubber roller 30

V2: Circumferential speed of bottle 8

Claims (6)

A printing device comprising: a holder for holding a workpiece that is a rotationally symmetrical body rotatably around an axis of rotational symmetry; The workpiece is rotated together to print on the workpiece; the first driving source is used to rotate the workpiece held by the holder; the second driving source is used to rotate the rubber cylinder; and the control device, It is used to control the driving of the above-mentioned first driving source and the driving of the above-mentioned second driving source; and the above-mentioned control device uses the peripheral speed of the above-mentioned workpiece at the contact portion of the above-mentioned workpiece and the above-mentioned rubber roller to be higher than that at the contact portion. The speed of the peripheral direction of the above-mentioned rubber roller is faster, and the driving of the above-mentioned first driving source and the driving of the above-mentioned second driving source are controlled. The printing device according to claim 1, wherein the control device is based on the peripheral speed of the workpiece at the contact portion and the peripheral speed of the rubber cylinder at the contact portion by at least 1% and 5 % or less, control the driving of the above-mentioned first driving source and the driving of the above-mentioned second driving source. The printing device according to claim 1 or 2, further comprising: a backup cylinder located on the upstream side of the contact portion in the rotation direction of the workpiece and used to contact the workpiece. The printing device according to claim 1 or 2, further comprising: a hardening unit located on the downstream side of the contact portion in the rotation direction of the workpiece, and configured to harden the ink printed on the workpiece. A printing method comprising: a step of holding a workpiece which is a rotationally symmetrical body rotatably about an axis of rotational symmetry; and printing on the workpiece by bringing one side of the rubber roller into contact with the rotating workpiece and the other side rotating together with the workpiece and, the step of printing the above-mentioned workpiece is in such a way that the circumferential speed of the above-mentioned workpiece at the contact portion between the above-mentioned workpiece and the above-mentioned rubber cylinder is faster than the circumferential speed of the above-mentioned rubber cylinder at the above-mentioned contact portion , a step of printing on the workpiece while controlling the driving of the first driving source for rotating the workpiece and the driving of the second driving source for rotating the rubber cylinder. The printing method according to claim 5, wherein the step of printing the workpiece is based on the peripheral speed of the workpiece at the contact portion and the peripheral speed of the rubber cylinder at the contact portion as a reference. More than 1% faster and less than 5% faster, while controlling the driving of the first driving source and the driving of the second driving source, the step of printing on the workpiece.

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