JP6700600B2 - Marking device - Google Patents

Description

  The present invention relates to a marking device that transfers a predetermined mark onto a target surface, and more particularly to a reversal stamp type marking device that marks on a side surface of an automobile tire.

  Generally, in the process of inspecting manufactured vehicle tires, unbalance measurement and uniformity measurement are performed. As a result of the inspection, for example, a position of a lightest weight (light point) in the circumferential direction of the tire or a portion having the largest outer diameter of the tire is marked with an arbitrary color. In applying such marks to the sidewalls of tires, a method of transferring marks having a predetermined shape by a stamp method has been adopted. For example, Patent Document 1 discloses a marker pen in which the tip of a pen core has the same marking surface shape as a mark.

  However, in the conventional method of penetrating the ink directly into the pen core, the ink on the tip of the pen becomes excessive due to repeated use, and the ink oozes out on the printing surface. May adversely affect quality. Therefore, in order to maintain good mark quality for a long period of time, it has been studied to always keep the amount of ink supplied to the stamp optimal by applying an inversion type structure as described in Patent Document 2, for example.

JP, 2006-150899, A JP, 2013-256031, A

  In a stamp-type marking device that transfers a mark by a pressing operation, in order to make the stamp surface follow the mark target surface, it is necessary to match the pressing direction of the stamp surface with the normal direction of the target surface. In other words, if the stamp is not pressed vertically against the surface to be marked, one of the marking surfaces may rise above the target surface, and a part of the mark may be missing. In particular, when automating marking on a non-flat target surface having a curved surface or a sloped surface such as a sidewall of a tire, it is necessary to measure the inclination of the mark target portion and control the posture of the marking device according to the inclination. However, the system design was complicated.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a marking device suitable for automation without hindering the working efficiency of marking.

  In order to solve the above-mentioned problems, the present invention provides a tank for storing ink, an ink pad for storing ink in the tank, an inner cylinder body for supporting a printing body with a printing surface facing the ink pad, An outer cylinder body that pivotally supports the stamp body and slidably accommodates the inner cylinder body via an elastic body, and presses the outer cylinder body against the repulsive force of the elastic body, A reversing type marking device capable of reversing the marking body in a cylindrical body to perform marking, wherein a lower end edge of the inner cylindrical body that abuts a surface to be marked is formed in an arc shape. Marking device.

Further, it is preferable that the center of curvature of the lower end edge be on a line extending in the sliding direction of the outer cylinder body and the inner cylinder body that passes through the pivot shaft of the stamp body.

  According to the marking device of the present invention, since the inner cylindrical body has the arcuate lower end edge, it is possible to improve the followability of the marking surface that approaches the marking target surface. That is, even when marking on a non-flat target surface having a curved surface or an inclined surface, it is not necessary to consider the posture of the marking device body so much. Further, when automating the marking work, it is not necessary to accurately control the posture of the marking device, so that the work efficiency can be improved.

3 is an external perspective view of the marking device according to the first embodiment. FIG. It is sectional drawing of the marking apparatus of FIG. It is the top view (a) and side view (b) of a printing body and an inversion piece. It is an outer side view (a) and an inner side view (b) of an inner frame member which constitutes an inner cylinder. It is a side view (a) and its sectional view (b) of an outer cylinder. It is a sectional view of an ink cartridge. FIG. 6 is a diagram for explaining a method of attaching and detaching the ink cartridge according to the first embodiment. It is the side view (a) and its bottom view (b) of a partition member. It is sectional drawing of a partition member. It is a figure for demonstrating one Example of the through-hole formed in the partition member. It is the top view (a) and the sectional view (b) of the accommodation member by one example. FIG. 9 is a cross-sectional view of a containing member according to another embodiment. FIG. 3 is a cross-sectional view for explaining the operation of the marking device of FIG. 1. It is a figure for demonstrating the reversal operation of a printing body. It is a figure for explaining further the reversal operation of a printing body. It is a figure for explaining further the reversal operation of a printing body. It is a figure for explaining further the reversal operation of a printing body. It is a figure for comparing and explaining the effect in the case of an arc-shaped inner cylinder by an example, and the case by a comparative example. It is a side view of the marking device by a 2nd embodiment. It is sectional drawing of the marking device of FIG. It is an exploded side view for explaining the separation structure of an outer cylinder. FIG. 3 is an exploded side view for explaining the structure of the ink cartridge.

  Hereinafter, as a preferred embodiment of the present invention, a marking device for transferring a mark to a sidewall of a vehicle tire will be exemplarily described with reference to the drawings.

(First embodiment)
FIG. 1 is an external perspective view of a marking device 10 according to the first embodiment. FIG. 2 is a vertical sectional view of the marking device 10. The marking device 10 includes a marking body 20 having a predetermined marking shape such as a light dot, for example, a circular marking surface, an inner cylindrical body 30 that rotatably supports the marking body 20 inside, and an inner cylindrical body 30 that slides vertically. And an outer cylindrical body 40 that is movably accommodated.

FIG. 3 shows a plan view and a side view of the stamp body 20 and the reversing piece 21 that reverses the stamp body 20. First, the stamp body 20 is formed of a columnar elastic body having a stamp surface that abuts on the marking object, and a non-porous body having no bubbles or a sponge body (porous body) having closed cells can be used. In order to prevent the ink from sticking (excessive coating), it is preferable to use a non-absorbent material instead of an open-cell sponge body. In addition, a sponge body having closed cells is preferable in order to improve the followability of the mark target surface due to the deformation at the time of imprinting and to obtain an appropriate repulsive force.
The stamp 20 can be obtained by kneading rubber, a vulcanizing agent, a filler, a softening agent, a coloring agent, an antiaging agent, other additives and the like, and then vulcanizing the mixture. As a material, any ordinary rubber can be used without any problem. Natural rubber, NBR, SBR, BR, IR, EPDM, ACM, IIR, silicone rubber, polyurethane rubber, etc. may be used alone or in combination. You can As the vulcanizing agent, any vulcanizing agent can be used without any problem as long as it is usually used for vulcanizing the rubber, and sulfur, sulfur compounds, peroxides and the like can be used. In addition, it is preferable to add additives such as a filler, a softening agent, a coloring agent, and an anti-aging agent, as in a general rubber molded product. Examples of the filler include barium sulfate, calcium carbonate, silicic acid, magnesium silicate, calcium silicate, etc., examples of the softening agent include paraffinic process oil, naphthenic process oil, etc. , Carbon black, titanium white, ultramarine blue, phthalocyanine, red iron oxide, lead chromate and the like, and examples of the antiaging agent include phenol and wax. In addition, vulcanization aids such as zinc stearate, stearic acid, zinc white, zinc oxide, and magnesium oxide, and vulcanization accelerators such as thiazoles, tyriums, sulfenamides, and dithiocarbamates. You may mix an additive. In the case of a closed-cell sponge body, it can be obtained by kneading with a foaming agent, a foaming auxiliary agent, etc. and vulcanizing this.
As a method of forming the stamp surface, engraving, laser processing, pressing, etc. are performed to process the stamp surface on one side.
In the case of a solid mark having the marking surface entirely filled, a closed-cell sponge body is preferable, and in this case, clear marking can be performed even if the marking target surface is a flat flat surface or a deformed surface having irregularities.
Further, since the sponge body of closed cells is soft and the seal imprint is easily crushed, when the seal face is characters (numbers, alphabets, etc.) or a pattern, a non-porous body is preferable because the seal imprint is not easily crushed.

  The stamp body 20 has a side surface opposite to the stamp surface fixed to the upper surface of the reversing piece 21 via a screw portion. The reversal piece 21 for reversing the stamp 20 can be formed by die casting of an aluminum alloy, for example. Shaft portions 22 pivotally supported by bearing portions 46 of an outer cylindrical body 40, which will be described later, are formed on both left and right sides of the reversing piece 21, respectively. Further, semicircular grooves 23a and 23b are formed on both left and right sides of the shaft portion 22 as a center, and a circular head projection 24 is formed immediately below the shaft portion 22. These semi-circular grooves 23a and 23b and the circular head projection 24 form a reversing mechanism that engages a reversing guide 36 of an inner cylinder body 30 described later to reverse the stamp 20 together with the reversing piece 21. Further, an O-ring 25 is provided around the reversing piece 21 to secure a sealing property with an ink pad 55 described later (see FIG. 2).

  Next, as shown in FIG. 4, the inner cylindrical body 30 is assembled by arranging two inner frame members 34F and 34R which are in a symmetrical relationship with each other, and which are screwed together. Note that FIG. 2 illustrates a state in which the inner frame member 34F on the front side of the drawing is removed in order to help understanding of the structure of the marking device 10.

  As shown in FIG. 2 and FIG. 4, a stamper movable portion 31 which is a space that allows the stamper 20 and the reversing piece 21 to move and rotate is formed by vertically penetrating the inside of the inner cylinder 30. Has been done. A cartridge fitting portion 32 for detachably fitting a niple 52 of an ink cartridge 50, which will be described later, is formed on an upper portion of the inner cylinder body 30 that communicates with the printing body movable portion 31. The niple 52 accommodating the ink pad 55 is fitted into the cartridge fitting portion 32, so that the marking body 20 in the inner cylindrical body 30 is supported so that the marking surface and the ink pad 55 face each other.

  On the other hand, in the lower part of the inner cylindrical body 30, a stamp face opening 33 is formed which communicates with the stamp movable portion 31 and exposes the stamp 20 downward during marking. The periphery of the stamp face opening 33, which is the lower end edge 33a of the inner tubular body 30, is a portion that comes into contact with the sidewall of the tire that is the marking target surface. Although the details will be described later, one of the features of the marking device 10 is that the lower end edge 33a of the inner cylindrical body 30 is curved.

  The inner frame members 34F and 34R have long holes 35 extending vertically in the sliding direction within the outer tubular body 40. The shaft portion 22 of the reversing piece 21 is inserted into the elongated hole 35. That is, in the inner tubular body 30, the shaft portion 22 of the reversing piece 21 is guided by the elongated hole 35 in conjunction with the pressing operation of the outer tubular body 40, whereby the reversing piece 21 moves up and down. Further, the reversing piece 21 is also allowed to rotate around the shaft portion 22 in the print movable portion 31 of the inner cylinder body 30. Naturally, the stroke range in which the reversing piece 21 can move up and down is limited by the length of the long hole 35.

  A reversing guide 36 is formed along the elongated hole 35 on the inner wall portions of the inner frame members 34F and 34R. The reversing guide 36 of the present embodiment is formed by having a substantially semicircular middle groove 36c between two columnar upper and lower small projections 36a and 36b. However, as long as the reversing piece 21 having the stamp body 20 moves up and down, the reversing guide is limited to the mode described here as long as it is a gear body or a cam mechanism that meshes so as to reverse the reversing piece 21. is not.

  The inner tubular body 30 is slidably inserted into the lower open portion of the outer tubular body 40 in a state in which the reversing piece 21 having the stamp body 20 is housed inside.

  Next, the structure of the outer cylinder body 40 will be described in detail. 5A is a side view of the outer tubular body 40, and FIG. 5B is a vertical cross-sectional view of the outer tubular body 40. The outer cylinder body 40 is a container that accommodates the ink cartridge 50 that stores ink, and is a member that also functions as a handle portion when manually marking. When the marking device 10 is incorporated in an automated line, for example, the outer cylinder 40 is fixed to the tip of an articulated robot arm, or attached to a manipulator in such a manner as to grip the outer cylinder 40.

  The outer tubular body 40 is assembled in a substantially square tubular shape by two outer frame members 41 facing each other being opposed to each other, and these outer frame members 41 being screwed. Inside the outer tubular body 40, a tank housing portion 42 which is a space for housing a part of the tank 51 of the ink cartridge 50, a spring housing portion 43 which is a space for housing the coil spring 60 which is an elastic body, An inner cylinder sliding portion 44 that slidably accommodates the cylinder 30 is formed in communication with each other. The inner cylinder sliding portion 44 is provided with a bearing portion 46 that rotatably supports the shaft portion 22 of the reversing piece 21.

  Next, FIG. 6 shows a cross-sectional view of the ink cartridge 50 mounted in the outer cylinder body 40. The ink cartridge 50 includes a tank 51 that stores ink and a niple 52 that holds an ink pad 55 and the like. The tank 51 according to the present embodiment has a substantially V shape or a substantially U shape in a front view. A niple 52 is attached to the bottom of the tank 51. In the ink cartridge 50, the niple 52 is inserted into the cartridge fitting portion 32 of the inner tubular body 30 and the right side portion of the tank 51, for example, is accommodated in the tank accommodating portion 42. An opening 45 is formed on one side (for example, the left side in FIG. 2) of the outer cylinder 40, and a part of the left side of the tank 51 of the ink cartridge 50 is exposed to the outside from the opening 45.

  Then, the ink cartridge 50 is sandwiched in the outer cylinder 40 between the coil spring 60 and the inner cylinder 30 which are in a compressed state. The elastic repulsive force of the coil spring 60 acts in the direction of pressing the ink cartridge 50 downward, with the concave portion at the center of the tank 51 as the point of action. Therefore, the inner tubular body 30 is held by being pressed by the niples 52 of the ink cartridge 50 and urged in the direction in which the inner tubular body 30 always projects from the outer tubular body 40.

In the marking device 10, the ink cartridge 50 is detachable via the one opening 45 of the outer cylinder 40. That is, as shown in FIG. 7, with the left part of the tank 51 exposed from the opening 45 as a starting point, the ink cartridge 50 is slightly moved in a direction against the elastic repulsive force of the coil spring 60, whereby the niple 52 is moved to the cartridge. It can be detached from the fitting portion 32. Then, at the moved position, the left part of the tank 51 is pulled out to the upper left, so that the ink cartridge 50 can be easily taken out from the opening 45 of the outer tubular body 40.
On the contrary, the coil spring 60 is installed in the concave portion at the center of the tank 51 while the right portion of the tank 51 is put into the tank housing portion 42 first, so that the elastic force of the coil spring 60 causes the niple 52 to move into the cartridge fitting portion 32. To automatically move to fit. As a result, the ink cartridge 50 can be easily installed in the marking device 10.

  As described above, according to the marking device 10 of the present embodiment, the ink cartridge 50 can be easily attached to and detached from the outer cylinder 40 only by performing a series of movement operations on the ink cartridge 50. In the step of marking each of the mass-produced tires, the marking device 10 consumes a large amount of ink, and it is necessary to frequently check and replenish the amount of ink. However, according to the marking device 10, the ink cartridge 50 that has been consumed and emptied of ink can be easily replaced with the ink cartridge 50 that has been refilled with ink, so that the marking work efficiency is not reduced. Further, since the ink cartridge 50 can be attached to and detached from the marking device 10 only by a series of moving operations, it is easy to automate the exchange of the ink cartridge 50, and the efficiency of the marking operation can be further improved.

The ink used in the marking device 10 can be appropriately used regardless of whether it is a pigment type, a dye type, an oil type, or an aqueous type. For example, as an ink for marking an automobile tire, an oil-based ink obtained by dissolving and mixing a colorant, a resin and the like in a quick-drying solvent can be used.
In this case, an existing volatile organic solvent can be used as the quick-drying solvent, and for example, an alcohol solvent, an alicyclic hydrocarbon, an aliphatic hydrocarbon, an aromatic hydrocarbon, a ketone, a glycol ether or the like is used. be able to.
As the colorant, the dye may be any oil-soluble dye, such as nigrosine-based, azine-based, monoazo-based, disazo-based, metal complex salt-type monoazo-based, anthraquinone-based, phthalocyanine-based, triallylmethane-based oil-soluble dyes, oil-soluble dyes. Salt forming dyes, oil-soluble metal-containing dyes can be used, and the pigments are condensed azo, isoindolinone, quinacridone, diketopyrrolopyrrole, anthraquinone, dioxazine, phthalocyanine, organic pigments such as thioindico, carbon black, titanium oxide, An inorganic pigment such as iron oxide, a bright pigment obtained by coating mica or glass with titanium oxide or iron oxide, a metallic pigment such as aluminum powder or brass powder, and the like can be used. Further, existing UV curable ink or the like can also be used.

The niple 52 provided at the bottom of the ink cartridge 50 will be described in more detail.
As shown in FIG. 6, the niple 52 is composed of two parts: a bottomed hollow cylindrical partition member 53 and a bottomless hollow cylindrical housing member 54 for housing the ink pad 55. The outer diameters of the partition member 53 and the containing member 54 are substantially the same. In the niple 52, the fitting portion 541 (see FIG. 11B) of the housing member 54 is fitted with the fitting portion 533 (see FIG. 8A) of the partition member 53, and the both members are joined together. It is a member.

  As described above, the niple 52 is formed by integrating the containing member 54 for containing the ink pad 55 and the partition member 53. However, when the ink pad 55 deteriorates in ink storage performance due to deterioration over time, etc. By separating the containing member 54 from the partition member 53, the ink pad 55 inside can be easily replaced.

As shown in FIG. 6, a partition member 53 is interposed between the ink discharge port 511 of the tank 51 and the ink pad 55 housed in the housing member 54. Here, FIG. 8A is a side view of the partition member 53, and FIG. 8B is a bottom view of the partition member 53. Further, FIG. 9 is a vertical cross-sectional view of the partition member 53.
A female screw portion 534 is formed on the inner wall of the partition member 53. The niple 52 is detachably attached to the tank 51 by screwing the female screw portion 534 of the partition member 53 into the male screw portion 512 formed in the ink discharge port 511 at the bottom of the tank 51.

  8 and 9, the partition member 53 has a plurality of through holes (ink supply holes 531 and air vent holes 532) that penetrate a bottom plate portion (hereinafter, simply referred to as a “partition plate portion”) 530. There is. These through holes (531, 532) can facilitate replacement of the air remaining in the ink pad 55 in the form of bubbles with the ink supplied from the tank 51.

  An example of the through holes 531 and 532 formed in the partition plate portion 530 is shown in FIG. According to this embodiment, the partition plate portion 530 has a disc shape. The through hole is composed of at least one ink supply hole 531 and a plurality of air vent holes 532, and the partition plate portion 530 has a plurality of air vent holes 532 arranged radially around the ink supply hole 531. Has been formed.

  Here, the opening diameter on the ink pad side (lower side) of the ink supply hole 531 is defined as a, and the opening diameter on the tank side (upper side) is defined as a1. Further, the opening diameter on the tank side (upper side) of the air vent hole 532 is defined as b, and the opening diameter on the ink pad side (lower side) is defined as b1. It should be noted that the plurality of air vent holes 532 have the same radial shape, but have the same shape. Further, the "opening diameter" refers to the maximum opening diameter of the through hole. That is, the opening diameter of the circular ink supply hole 531 corresponds to the diameter of the hole, and the opening diameter of the air vent hole 532 corresponds to the opening length of the partition plate portion 530 in the radial direction.

In this case, the opening diameter a of the ink supply hole 531 is preferably larger than the opening diameter b of the air vent hole 532 (conditional expression (1)).
a>b... (1)

In addition to the conditional expression (1), it is preferable that the opening diameter a1 of the ink supply hole 531 on the tank side is larger than the opening diameter a of the ink pad side (conditional expression (2)).
a1>a (2)

In addition to the conditional expression (1), it is preferable that the opening diameter b1 of the air vent hole 532 on the ink pad side is larger than the opening diameter b of the tank side (conditional expression (3)).
b1>b... (3)

  The partition member 53 in which the ink supply hole 531 and the air vent hole 532 are formed as described above makes it possible to smoothly replace the air with the ink in the ink pad 55. Therefore, not only the initial ink is supplied to the ink pad 55, but also the ink from the tank 51 can be occluded in the ink pad 55 without excess or deficiency within a short period of one stamping process.

  The ink pad 55 is housed and held in the housing member 54. The ink pad 55 may be, for example, a non-woven fabric made of synthetic resin fiber or a felt processed body as long as it has a capillary gap capable of absorbing ink of a non-viscous liquid. As the material, for example, a polyolefin fiber made of polyethylene (PE) and polypropylene (PP) can be adopted. Further, the ink pad 55 can be formed of a porous material such as sponge made of polyvinyl alcohol (PVA) or the like.

  Further, in order to improve the continuous imprintability, the ink pad 55 may have a multi-layer structure having different basis weights (fiber density). For example, when the ink pad has a two-layer structure, the basis weight of the side layer contacting the printing surface can be made larger than the basis weight of the ink supply side layer. These layers can be adhered to each other by, for example, a heat fusion process. With such a multi-layer structure, a difference in capillary force is generated, and the ink flow can be adjusted without impairing the initial ink supply to the ink pad 55. It is particularly preferable when the printing body 20 is a non-porous body.

  Here, FIG. 11A is a plan view of the housing member 54, and FIG. 11B is a vertical cross-sectional view of the housing member 54. In the containing member 54, a lower portion of the fitted portion 541 formed on the upper portion of the inner wall of the cylindrical body serves as a containing space 542 for containing the ink pad 55.

  Further, below the accommodating space 542, an ink reservoir 544 that absorbs ink leakage from the ink pad 55 is formed. In the embodiment of FIG. 11, the ink reservoir 544 is formed by grooves 543a, 543a,... Which adsorb liquid ink using a slit-shaped gap. That is, in the accommodation member 54, a plurality of fold-shaped bodies 543, 543,... Radially extending from the inner wall thereof toward the central axis are formed. The pleats 543, 543,... Are arranged at the same interval in the circumferential direction of the housing member 54 and are formed to have the same length in the radial direction. Such a fold-like body 543 preferably has an affinity with the ink used in order to hold liquid ink to some extent.

  In the present embodiment, the ink reservoir 544 is in contact with the ink reservoir 544 composed of the slit-shaped grooves 543a, 543a,... On the surface area of the lower surface of the ink pad 55 except the surface contacting the printing body 20. There is. The folds 543, 543,... Are adjacent to each other at a short distance, and the slit-shaped grooves 543a, 543a,. Have Further, the capillary force of the ink reservoir 544 increases as the radial grooves 543a, 543a,... Are closer to the center side, that is, to the side where the print body 20 is present.

If the internal pressure of the tank 51 increases due to a rapid temperature change or the like, the ink stored in the ink pad 55 may leak to the outside. However, according to this embodiment, the ink leaking from the ink pad 55 can be absorbed by the ink reservoir 544, and a certain amount of ink can be retained. Therefore, even when the internal pressure of the tank 51 is high, it is possible to avoid the situation where ink is ejected when the stamp 20 is separated from the ink pad 55 during stamping.
Particularly, in the radial ink reservoir 544, the gap between the grooves 543a, 543a,... becomes narrower toward the center, and the capillary force becomes larger. Therefore, the ink leaking to the printing body 20 side at the center of the ink pad 55 is preferentially absorbed so that excess ink does not adhere to the printing surface.

  Further, since the capillary force of the ink pad 55 is stronger than that of the ink reservoir 544, when the internal pressure of the tank 51 returns to the normal level, the leaked ink accumulated in the ink reservoir 544 is quickly absorbed by the peripheral edge of the ink pad 55. Can be returned.

  As another embodiment, as shown in FIG. 12, an ink reservoir 545 that contacts the outer peripheral side surface of the ink pad 55 may be formed in the containing member 54. Also in this embodiment, slit-shaped grooves 546a, 546a,... Are formed by the plurality of pleats 546, 546,... Radially extending toward the central axis. The ink reservoir 545 having such a configuration can also efficiently collect ink leakage from the ink pad 55. Further, in order to secure the capacity of the leak ink, as shown in FIG. 12, the folds 546, 546,... May be extended to the periphery of the stamp 20 to be formed.

  In any of the embodiments shown in FIGS. 11 and 12, the marking body 20 enters the internal space of the containing member 54 defined by the ink reservoirs 544 and 545, and the marking surface faces the ink pad 55 and abuts against it. It has a structure. Then, the reversing piece 21 urged by the coil spring 60 presses the lower end of the housing member 54 via the O-ring 25 around the stamp body 20. With such a closed structure of the containing member 54, it is possible to effectively prevent volatilization and drying of ink in the ink pad 55. Further, since the O-ring 25 relieves the contact pressure between the ink pad 55 and the printing body 20, it is possible to prevent the ink pad 55 from being deformed with time or from being settled.

  Next, a marking operation by the marking device 10 having the above-described configuration will be described. Here, as shown in FIG. 13, an example in which the light spot mark is transferred to the sidewall of the tire T will be described.

  When not in use, the marking device 10 is in a state in which the inner cylindrical body 30 projects from the outer cylindrical body 40 by the action of the elastic repulsive force of the coil spring 60, and the entire marking device 10 is extended. In this initial state, the printing body 20 is inside the housing member 54 as described above, and the printing body 20 is in contact with the ink pad 55 in order to attach the ink for transfer to the printing surface.

  Next, when marking is started, the unbalance peak position (light point) of the tire T measured in advance is set as a target, and the lowest point of the lower edge 33a of the inner tubular body 30 is aligned with that position. Contact. Then, when the outer tubular body 40 is pushed down against the repulsive force of the coil spring 60, the entire inner tubular body 30 contracts so that the inner tubular body 30 enters the outer tubular body 40. At this time, the reversing piece 21 pivotally supported by the outer tubular body 40 is guided by the vertically long slot 35 of the inner tubular body 30 and moves downward in the inner tubular body 30.

  When the reversing piece 21 on which the stamp body 20 is installed descends in conjunction with the pressing operation of the outer cylinder 40, first, the first semicircular groove 23a on the right side of the reversing piece 21 causes the reversal guide 36 of the inner cylinder 30 to move. It contacts the upper small protrusion 36a (FIG. 14A). At this time, the right side of the reversing piece 21 is pushed up by the small protrusion 36a, and the reversing piece 21 starts rotating around the shaft portion 22 (FIG. 14B).

  When the rotation angle of the reversing piece 21 becomes 90°, the central circular protrusion 24 engages with the reversing guide 36 so as to enter the inside groove 36c (FIG. 14C). When the reversing piece 21 further rotates, the lower small protrusion 36b pushes up the round head protrusion 24 this time. As a result, finally, the reversing piece 21 is reversed by 180° at the lower end position of the inner cylindrical body 30, and the stamp surface of the stamp body 20 faces the mark target surface side (FIG. 14D). When the outer cylinder body 40 is further pushed down, the pressing force is applied to the stamp body 20. As a result, the stamp surface of the stamp body 20 is pressed against the tire T, and the ink is transferred thereto.

  When the pressing of the outer cylinder 40 is released after the marking is completed, the inner cylinder 30 returns to the initial position by the repulsive force of the compressed coil spring 60. In conjunction with this, the reversing piece 21 also moves upward in the inner cylindrical body 30 and returns to the initial position. At this time, the seal face is inverted upwards by an operation opposite to the above-described engagement operation with the inversion guide 36.

  In the marking device 10 of the present embodiment, the lower end edge 33a of the inner cylindrical body 30 that comes into contact with the tire surface that is the marking target surface is formed in an arc shape. Furthermore, the center of curvature of the lower end edge 33a that bends in an arc shape is on the extension line in the sliding direction of the outer cylinder body 40 and the inner cylinder body 30 that passes through the shaft portion 22 (the pivot shaft of the stamp) of the reversing piece 21. Preferably.

In this way, since the inner cylindrical body 30 has the arcuate lower end edge 33a, it is possible to improve the followability of the stamp surface that faces the mark target surface and approaches.
FIG. 15 shows a diagram comparing the effects of the inner cylindrical body having the arcuate lower edge 33a according to the example and the case of having the linear lower edge (shown by the broken line) according to the comparative example. According to FIG. 15, in the case of the embodiment, if the inclination of the marking device 10 with respect to the mark target surface is equal to or smaller than the maximum allowable angle Ra on one side, the marking surface of the stamp 20 has good followability capable of being transferred to the target surface. is doing. On the other hand, in the case of the comparative example, since the corner of the inner cylinder interferes with the mark target surface, the maximum allowable angle Ro on one side of the marking device that allows the transfer of the entire printing surface is smaller than the maximum allowable angle Ra of the present embodiment. Is understood (Ra>Ro).

  Even if the marking device 10 is slightly tilted with respect to the normal direction of the mark target surface and is pressed, if the tilt is equal to or less than the maximum allowable angle Ra, a clear mark can be formed without causing a drop in a part of the mark. It can be transferred to the tire surface. This means that even when marking on a non-flat target surface having a curved surface or an inclined surface such as a sidewall of a tire, the posture of the marking device main body need not be considered so much. In other words, when automating the marking work, it is not necessary to accurately control the posture of the marking device 10, so that the work efficiency can be improved.

  Further, by providing the center of curvature of the lower end edge 33a of the inner cylindrical body on the extension line in the sliding direction of the inner cylindrical body 30 passing through the shaft portion 22 of the reversing piece 21, the pressing operation force applied to the outer cylindrical body 40 is dispersed. It is possible to concentrate on the marking body 20 without doing so. Accordingly, if the lowest point of the lower edge 33a of the inner cylinder is aligned with the light point position of the tire, a clear mark can be reliably transferred to the light point position.

(Second embodiment)
Next, the marking device 70 according to the second embodiment will be described. In addition, in the drawings referred to below, constituent elements common to or corresponding to those of the first embodiment are denoted by the same reference numerals, and the detailed description thereof is the same as that of the above-described first embodiment. To be done.

  FIG. 16 shows a side view of the marking device 70 according to the second embodiment. FIG. 17 shows a vertical sectional view of the marking device 70. The marking device 70 according to the present embodiment is similar to the first embodiment in that a tank 91 that stores ink, an ink pad 55 that stores ink from the tank 91, and a printing surface that faces the ink pad 55 An inner cylinder body 30 that supports 20 and an outer cylinder body 80 that pivotally supports the stamp body 20 and slidably accommodates the inner cylinder body 30 via a coil spring 60 are provided. By pressing the outer cylinder body 80 against the repulsive force of the coil spring 60, the marking body 20 can be reversed in the inner cylinder body 30 to perform marking.

  The outer cylindrical body 80 is a hollow cylindrical portion 81 that is an "upper frame portion" and a "lower frame portion", as shown in FIG. 18, in order to facilitate replacement of the ink cartridge 90. Similarly, it has a structure in which the hollow rectangular tubular portion 82 is coupled and separated. For example, a male screw portion 82a is formed on the upper portion of the rectangular tubular portion 82, and the cylindrical portion 81 and the rectangular tubular portion 82 can be attached and detached by being screwed into the female screw portion 81a on the lower portion of the cylindrical portion 81. Are connected.

  The inner cylindrical body 30 has an arcuate lower end edge 33a as in the first embodiment. As a result, even when marking on a non-flat target surface having a curved surface or an inclined surface such as a sidewall of a tire, accurate posture control is not required.

  Further, the upper portion of the inner tubular body 30 is slidably inserted into the rectangular tubular portion 82 that constitutes the lower frame portion of the outer tubular body 80. A bearing portion 46 is formed in the rectangular tubular portion 82, and the shaft portion 22 of the reversing piece 21 (print body 20) that is reversed in the inner tubular body 30 is rotatably supported by the bearing portion 46. .. Further, in the inner cylindrical body 30, as in the above-described first embodiment, a long hole 35 for guiding the shaft portion 22 of the reversing piece 21 in the vertical direction, a reversing guide 36 for reversing the reversing piece 21, and the like are formed. ing.

  As shown in FIG. 19, the ink cartridge 90 includes a cylindrical tank 91 that stores ink, and a niple 52 that is attached to the lower portion of the tank 91 as in the first embodiment. The tank 91 is housed in the cylindrical portion 81 that constitutes the upper frame portion of the outer tubular body 80. Similar to the first embodiment, the niple 52 can be composed of a partition member 53 that facilitates the replacement of ink and air, and a storage member 54 that stores the ink pad 55. The ink reservoir 544 (or 545) similar to that of the first embodiment can be formed in the containing member 54.

  In the outer tubular body 80, the niple 52 of the ink cartridge 90 penetrates the rectangular tubular portion 82, and the tip of the containing member 54 contacts the upper portion of the inner tubular body 30. A coil spring 60 in a compressed state is inserted into the cylindrical portion 81 and constantly presses the niple 52 of the ink cartridge 90. That is, the ink cartridge 90 is elastically sandwiched between the coil spring 60 and the inner cylinder body 30 in the outer cylinder body 80.

  When not in use (initial state), the elastic repulsive force of the coil spring 60 acts on the ink cartridge 90, whereby the inner cylindrical body 30 is pushed out from the outer cylindrical body 80, and the whole is in a stretched state. In this initial state, the printing body 20 in the inner cylinder 30 contacts the ink pad 55 inside the housing member 54, and ink is supplied to the printing surface.

  The outer tubular body 80 can separate the cylindrical portion 81 (upper frame) from the rectangular tubular portion 82 (lower frame) as described above, and the ink cartridge 90 can be easily taken out in that state. Is. In this way, according to the marking device 70, the ink cartridge 90 that has been consumed and emptied of ink can be easily replaced with the ink cartridge 90 that has been replenished with ink, so that the marking work efficiency is not reduced. Further, it is easy to automate the replacement of the ink cartridge 90, and it is possible to further improve the efficiency of the marking work.

10 Marking device (first embodiment)
20 Stamp 21 Reversing Piece 22 Shafts 23a, 23b Semicircular Groove 24 Circular Head Projection 25 O-ring 30 Inner Cylinder 32 Cartridge Fitting 33a Lower End Edges 34F, 34R Inner Frame Member 35 Long Hole 36 Inversion Guide 40 Outer Cylinder 45 Opening 46 Bearing 50 Ink cartridge 51 Tank 52 Niple 53 Partition member 531 Ink supply hole 532 Air vent hole 54 Ink pad housing member 543 Folded body 543a Slit-like groove 544 Ink reservoir 55 Ink pad 60 Coil spring 70 Marking device (Second embodiment)
80 Outer cylinder 81 Cylindrical part 82 Square tubular part 90 Ink cartridge 91 Tank

Claims (2)

A tank for storing ink, an ink pad for storing ink in the tank, an inner cylinder body for supporting a printing body by facing the printing surface to the ink pad, and an inner cylinder for pivotally supporting the printing body via an elastic body. An outer cylinder body slidably accommodating the inner cylinder body, and by pressing the outer cylinder body against the repulsive force of the elastic body, the marking body is reversed in the inner cylinder body for marking. It is a reversible marking device that can be performed,
A marking device, wherein a lower end edge of the inner cylindrical body which is in contact with a mark target surface is formed in an arc shape.   The marking device according to claim 1, wherein a center of curvature of the lower end edge is on a line extending in a sliding direction of the outer cylinder body and the inner cylinder body that passes through a pivot shaft of the stamp body.

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