JP4739425B2 - Stamping device - Google Patents

Description

  The present invention relates to a marking device that displays a marking on the surface of a molded product at the time of mold molding, and more particularly to a marking device that can prevent inflow of a molten material in a high temperature molding process while maintaining excellent operability.

  Due to the development of molding technology and resin development technology, various resin materials and metal materials are used for molding today. Some of these materials have a high melting point, and molding using the high melting point material is performed in a high temperature environment. As a molding process performed under such a high temperature environment, aluminum die casting is well known.

In a molding process, a product identification function is given to a product by attaching a production date or a production line number to many molding processing factories. Patent Document 1 discloses various types of marking devices for attaching a product identification function to a product. FIG. 19 shows one of various marking devices disclosed in Patent Document 1. 19A is a plan view of the marking device, FIG. 19B is a longitudinal sectional view of the marking device, and FIG. 19C is a bottom view of the marking device.
The marking device (M) shown in FIG. 19 is inserted into a cylindrical outer shell (O), a cylindrical rotating cylinder (R) accommodated in the outer shell (O), and the rotating cylinder (R). In the index shaft (I) and the outer shell body (O), a pedestal portion (S) that supports the rotating cylinder (R) and the index shaft (I), and a lid for closing the bottom surface of the outer shell body (O) It consists of a body (L).

  The marking device (M) is fixed to the mounting hole of the mold device, and the engraved surface composed of the upper surface of the outer shell (O), the rotating cylinder (R), and the index shaft (I) is in the cavity of the mold device. To face. The upper surface of the outer shell (O), the rotating cylinder (R), and the index shaft (I) are each marked with a marking (C), and the molten material injected into the cavity flows into the marking (C). As a result, after the molten material is solidified, an identification character raised from the surface of the molded product appears. In general, in order to prevent an annular boundary line between the outer shell (O), the rotating cylinder (R) and the index axis (I) from appearing on the surface of the molded product, the outer shell (O), the rotating cylinder (R) and The upper surfaces of the index axes (I) are formed flush with each other.

  The marking device (M) disclosed in Patent Document 1 includes a control mechanism that enables selection of rotation and stationary of the rotating cylinder (R) depending on the rotation direction of the index shaft (I). For example, when the index axis (I) is rotated clockwise, the rotating cylinder (R) remains stationary, while when the index axis is rotated counterclockwise, the rotating cylinder (R) is moved to the index axis (I ) And rotate counterclockwise. As described above, the marking device (M) disclosed in Patent Document 1 is excellent in operability, but when used in a high-temperature molding process typified by aluminum die casting, it impairs the excellent operability. It becomes.

  In general, the kinematic viscosity of a fluid decreases with increasing temperature. A low kinematic viscosity molten material will flow into a small gap. When the stamping device (M) disclosed in Patent Document 1 is used for, for example, aluminum die casting, the low-viscosity molten aluminum forms a boundary between the outer shell (O) and the rotating cylinder (R) and the rotating cylinder (R). It flows into the boundary of the index axis (I). The inflowing molten aluminum is solidified through a cooling process performed after the molten aluminum injection process. The aluminum solidified at the boundary between the outer shell (O) and the rotating cylinder (R) and at the boundary between the rotating cylinder (R) and the index axis (I) causes the rotation of the index axis (I) and the rotation of the rotating cylinder (R). Will interfere.

Patent Document 2 discloses a marking device (M1) having a structure effective for preventing inflow of molten material. FIG. 20 is a schematic perspective view of the marking device (M1) of Patent Document 2.
The marking device (M1) disclosed in Patent Document 2 includes a trapezoidal cone-shaped head (H) and a leg (E) extending downward from the lower surface of the head (H). It is inserted into the tapered hole (T) formed in D). The marking device (M1) is fixed to the mold device (D) by screwing a nut disposed on the lower surface of the mold device (D) and a screw portion of the leg (E).

  The peripheral surface of the head (H) abuts the peripheral surface of the taper hole (T), and a high pressure can be generated between these peripheral surfaces by screwing the nut and the leg (E). Inflow of the molten material to the boundary between the head (H) and the tapered hole (T) can be suppressed.

JP 2008-68506 A Japanese Utility Model Publication No. 61-44810

  The stamping device (M1) disclosed in Patent Literature 1 includes the stamping device (M1) disclosed in Patent Literature 1 for the purpose of preventing the inflow of the molten material in the high temperature molding process while maintaining excellent operability. Consider the case where a taper structure is employed. In this case, the taper structure shown in Patent Document 2 is provided on the inner peripheral surface of the outer shell (O), the inner peripheral surface and the outer peripheral surface of the rotating cylinder (R), and the outer peripheral surface of the index shaft (I). Can be adopted.

As described above, when the taper structure is adopted, high pressure is generated at the boundary between the outer shell (O) and the rotating cylinder (R) and at the boundary between the rotating cylinder (R) and the index shaft (I). This pressure brings about a high frictional force between the tapered surfaces formed on the outer shell (O), the rotating cylinder (R) and the index shaft (I), respectively. As a result, the index shaft (I) and the rotating cylinder (R) ) Will be hindered.
An arrow-shaped mark portion (C) is formed on the upper surface of the index shaft (I) of the marking device (M) shown in FIG. 19, and a minus driver is inserted into the mark portion (C) and rotated to thereby move the index shaft. (I) can be rotated. In order to resist the high frictional force between the outer shell (O), the rotating cylinder (R) and the taper surface of the index shaft (I), the arrow-shaped mark (C) is deeply engraved and driven by a minus driver. Although it is conceivable to transmit a force, the marked portion (C) that is deeply engraved forms an arrow-shaped convex portion that protrudes greatly from the surface of the molded product. Or the problem of the mold release defect in the process of releasing a molded product from a mold apparatus will be caused.

  This invention is made | formed in view of the said situation, and it aims at providing the marking apparatus which can prevent inflow of a low-viscosity molten material, maintaining the outstanding operativity.

The invention according to claim 1 is provided with a first engraved surface facing the cavity of the mold apparatus and one end-bottomed cylindrical outer shell body fixed to the mold apparatus, and the first engraved surface. A rotary cylinder provided with a second engraving surface that is arranged inside the outer shell through an opening formed in the outer surface and is flush with the first engraving surface, and the second engraving surface And a leg portion formed with a screw portion to be screwed into a screw hole in the bottom portion of the outer shell body, and along the axis of the rotating cylinder. An index shaft that is inserted into the rotating cylinder through the formed through-hole and is connected to the bottom of the outer shell body, and gravity that acts on the rotating cylinder while the index shaft and the outer shell body are screwed together given to the rotating cylinder a reaction force upward against consists mechanism to maintain the state where the rotation cylinder is lifted from the outer shell, the head of the indicator shaft The rotary cylinder is formed in a trapezoidal cone shape that narrows toward the inside of the outer shell body, and the rotating cylinder has an inner peripheral surface that comes into contact with an outer peripheral surface of the head portion of the index shaft, and the outer surface from the second engraved surface. includes a peripheral surface forming a trapezoidal cone-shaped head which narrows toward the interior shell, the outer shell may e Bei the inner peripheral surface the outer peripheral surface and abutting the head of the rotary cylinder, the mechanism Is composed of a protrusion fixed to the leg portion of the index shaft and extending in the radial direction of the index shaft, and the third marking surface is flush with the second marking surface. In front, when the projecting portion abuts the bottom surface of the rotating cylinder and supports the rotating cylinder, and the third engraving surface is flush with the second engraving surface, the projecting portion Is a marking device that is spaced apart from the bottom surface of the rotating cylinder .

The invention according to claim 2 is the marking device according to claim 1 , wherein the projecting portion is an annular plate .
According to a third aspect of the present invention, the screw portion of the index shaft includes a terminal portion located in the middle of the leg portion of the index shaft, and the annular plate is a nut that is screwed to the terminal portion. The marking device according to claim 2 .

According to a fourth aspect of the present invention, the annular plate further includes a C-type washer, the screw portion of the index shaft includes an annular groove at a position spaced from the terminal portion, and the washer is formed in the annular groove. 4. The marking device according to claim 3, wherein the marking device is fitted and abuts against one surface of the nut .
The invention according to claim 5 is characterized in that the material constituting the rotating cylinder has a higher coefficient of thermal expansion than the material constituting the outer shell. It is a marking device .
The invention according to claim 6 is characterized in that the coefficient of thermal expansion of the material constituting the index axis is higher than the coefficient of thermal expansion of the material constituting the rotary cylinder. It is a marking device .

The invention according to claim 7 is characterized in that an axial length dimension of the head portion of the rotating cylinder is shorter than an axial length dimension of a head accommodating space of the outer shell body that accommodates the head portion of the rotating cylinder. The marking device according to any one of claims 1 to 4 .
The invention according to claim 8 is characterized in that an axial length dimension of the head portion of the index shaft is shorter than an axial length dimension of a head accommodating space of the rotary cylinder accommodating the head portion of the index shaft. The marking device according to any one of claims 1 to 4 .
According to a ninth aspect of the present invention, the axial length dimension of the head portion of the rotating cylinder is shorter than the axial length dimension of the head accommodating space of the outer shell body that accommodates the head portion of the rotating cylinder, and the rotation 5. The marking device according to claim 1, wherein a coefficient of thermal expansion of a material constituting the cylinder is higher than a coefficient of thermal expansion of a material constituting the outer shell body .

The axial length dimension of the head of the index shaft is shorter than the axial length dimension of the head accommodating space of the rotary cylinder that houses the head of the index shaft, and the index shaft 5. The marking device according to claim 1, wherein a coefficient of thermal expansion of a material constituting the rotating cylinder is higher than a coefficient of thermal expansion of a material constituting the rotating cylinder .
The invention according to claim 11 is characterized in that the inner peripheral surface of the outer shell body that abuts on the outer peripheral surface of the head of the rotary cylinder includes at least one annular groove. It is a marking device according to the above.
A twelfth aspect of the present invention is the marking device according to any one of the first to tenth aspects, wherein the outer peripheral surface of the head portion of the rotary cylinder includes at least one annular groove .
According to a thirteenth aspect of the present invention, the inner peripheral surface of the rotary cylinder that comes into contact with the outer peripheral surface of the head of the index shaft includes at least one annular groove. It is a marking device as described in .
The invention according to claim 14 is the marking device according to any one of claims 1 to 12, wherein the outer peripheral surface of the head portion of the index shaft includes at least one annular groove .

According to the first aspect of the invention, while the index shaft is screwed into the outer shell body, the rotary cylinder attempts to enter the outer shell body by gravity, but the push-up mechanism moves the rotary cylinder to the outside of the outer shell body. In order to apply force in the pushing direction, the rotating cylinder maintains a position where it protrudes from the outer shell. As a result, the frictional force between the head of the rotating cylinder and the outer peripheral surface of the outer shell is minimized. In addition, while the index shaft is screwed into the outer shell, the index tube protrudes from the rotating cylinder as a result of the downward movement of the rotating cylinder relative to the index axis due to the action of gravity on the rotating cylinder. The position will be maintained. As a result, the frictional force between the head of the index shaft and the inner peripheral surface of the rotating cylinder is minimized.
Therefore, until the index shaft is completely screwed to the outer shell body (until the first, second and third engraved surfaces are flush with each other), the index shaft, the rotating cylinder and the outer shell body. The frictional force between them is minimized, and the stamping device can be easily assembled. For this reason, inadequate screwing of the index shaft to the outer shell body is prevented, the tight contact state between the index shaft, the rotating cylinder and the outer shell body is ensured, and the molten molding material flows into the marking device. Is prevented. In addition, since the index shaft can be accurately assembled to the outer shell body, the index shaft can be screwed into the outer shell body due to vibrations caused by the operation of the mold device to which the marking device is attached and temperature changes of the mold device. Therefore, the molten molding material can be prevented from flowing into the stamping apparatus for a long period of time.

According to the first aspect of the present invention, even in a high temperature environment that lowers the performance of the coil spring, it is possible to exert the action of keeping the rotating cylinder floating from the outer shell .
According to the second aspect of the present invention, it is possible to rotate tube without tilting the rotating cylinder exerts an effect of keeping the state of being floated from the outer shell, by screwing the indicator shaft in the shell In the meantime, contact between the index shaft, the rotary cylinder and the outer shell body is prevented, and the marking device can be assembled with high accuracy.
According to the invention described in claim 3 , assembly of the marking device is facilitated.
According to the fourth aspect of the present invention, it is possible to prevent the loosening of the nuts.

According to the fifth aspect of the present invention, the pressure between the outer shell and the rotating cylinder increases in a high temperature environment, and the molten material can be reliably prevented from flowing into the marking device.
According to the sixth aspect of the present invention, the pressure between the rotating cylinder and the outer shell increases under a high temperature environment, and the molten material can be reliably prevented from flowing into the marking device.
According to the seventh aspect of the present invention, the contact area between the rotating cylinder head and the outer peripheral surface of the outer shell can be reduced, and the pressure between the rotating cylinder and the outer peripheral surface of the outer shell can be increased. It is possible to reliably prevent the molten material from flowing into the marking device.
According to the eighth aspect of the present invention, the contact area between the index shaft head and the inner peripheral surface of the rotating cylinder can be reduced, and the pressure between the index shaft and the inner peripheral surface of the rotating cylinder can be increased. It is possible to reliably prevent the molten material from flowing into the marking device.
According to the ninth aspect of the present invention, the space formed between the rotating cylinder head and the outer peripheral surface of the outer shell is expanded and deformed at a high temperature due to the difference in thermal expansion coefficient between the rotating cylinder and the outer shell. Therefore, the second engraved surface can be prevented from protruding relative to the first engraved surface.
According to the invention described in claim 10, the space formed between the index shaft head and the inner peripheral surface of the rotating cylinder is subjected to expansion deformation under high temperature due to the difference in the thermal expansion coefficient between the index shaft and the rotating cylinder. In order to reduce the difference, it is possible to prevent the third engraving surface from protruding relative to the second engraving surface.

According to invention of Claim 11 and 12 , the contact area of a rotary cylinder head and an outer shell internal peripheral surface can be reduced, and the increase of the pressure between a rotary cylinder and an outer shell internal peripheral surface is aimed at. It is possible to reliably prevent the molten material from flowing into the stamping device.
According to the invention described in claims 13 and 14 , the contact area between the index shaft head and the inner peripheral surface of the rotating cylinder can be reduced, and the pressure between the index shaft and the inner peripheral surface of the rotating cylinder can be increased. It is possible to reliably prevent the molten material from flowing into the stamping device.

It is a figure which shows the state which attached the marking apparatus which concerns on this invention to the metal mold | die apparatus. It is the schematic of the marking apparatus which concerns on this invention. It is a figure which shows the outer shell of the marking apparatus shown in FIG. It is a figure which shows the rotating cylinder of the marking apparatus shown in FIG. It is a figure which shows the parameter | index axis | shaft of the marking apparatus shown in FIG. It is a figure which shows the ratchet ring of the marking apparatus shown in FIG. It is a figure which shows the washer of the marking apparatus shown in FIG. It is a figure which shows the assembly process of the marking apparatus shown in FIG. It is a figure explaining the prevention effect | action of the inflow of the molten material in the marking apparatus shown in FIG. It is a figure which shows the change form of the parameter | index axis | shaft shown in FIG. It is a figure which shows the change form of the rotating cylinder shown in FIG. It is a figure which shows the change form of the outer shell shown in FIG. It is a figure which shows the rotary cylinder and outer shell used for other embodiment of the marking apparatus which concerns on this invention. It is a figure explaining operation | movement of the positioning mechanism of the marking apparatus shown in FIG. It is a figure which shows the change form of the outer shell of the marking apparatus which concerns on this invention. It is a figure which shows the reference form of the marking apparatus which concerns on this invention. It is a figure which shows the assembly process of the marking apparatus shown in FIG. It is a figure which shows the reference form of the marking apparatus which concerns on this invention. It is a figure which shows an example of the conventional marking apparatus. It is a figure which shows an example of the conventional marking apparatus.

Hereinafter, embodiments of a marking device according to the present invention will be described with reference to the drawings.
FIG. 1 shows an example in which a marking device according to the present invention is attached to a mold. The example shown in FIG. 1 is merely for the purpose of explaining the marking device of the present invention, and the technical scope of the present invention is not limited by the example shown in FIG.
The mold apparatus (2) includes a fixed mold (21), a movable mold (22) contacting and separating from the fixed mold (21), a movable mold (22), and a movable platen connected to an actuator (not shown). (23). The power from the actuator is transmitted to the movable mold (22) via the movable plate (23), and the movable mold (22) is brought into and out of contact with the fixed mold (21).

The fixed mold (21) includes an injection port (211) through which a molten material such as molten metal or molten resin is injected.
The fixed mold (21) includes a projecting portion (212) projecting downward around the injection port (211). The movable mold (22) includes a recess (221), and the protrusion (212) of the fixed mold (212) enters the recess (221). The volume of the protrusion (212) is smaller than the volume of the recess (221), and a cavity (200) having a predetermined shape is formed between the protrusion (212) and the recess (221). In FIG. 1, a bowl-shaped molded product having an inclined peripheral wall is formed in the cavity (200).
The movable mold (22) is formed with a through hole (222) that penetrates the movable mold (22) vertically and communicates with the cavity (200). The marking device (1) according to the present invention is formed in the through hole (222). Is inserted and fixed to the mold apparatus (2). The engraving surface (10) of the marking device (1) is flush with the surface of the recess (221) and faces the cavity (200).

FIG. 2 is a diagram schematically showing the marking device (1). 2A is a plan view of the marking device (1), FIG. 2B is a longitudinal sectional view of the marking device (1), and FIG. 2C is a diagram of the marking device (1). It is a bottom view.
The marking device (1) includes a cylindrical shell (3) having a bottom end and a substantially cylindrical shape inserted into the shell (3) from an opening formed on the top surface of the shell (3). A rotating cylinder (4) and a substantially cylindrical index shaft (5) inserted into a through hole extending along the axis of the rotating cylinder (4) are provided. The marking surface (10) of the marking device (1) is composed of the upper surface of the outer shell (3), the rotating cylinder (4) and the index shaft (5).

On the upper surface of the outer shell (3), mark portions (31) composed of numbers from “1” to “12” are engraved at equal intervals. In the example shown in FIG. 2, the marking (31) on the upper surface of the outer shell (3) means “moon”.
On the upper surface of the rotating cylinder (4), a mark portion (41) made of a number “09” and a triangular symbol is engraved on the diameter line of the upper surface of the rotating cylinder (4). In the example shown in FIG. 2, the mark portion (41) composed of the number “09” means the year “2009”. One of the vertices of the triangular mark (41) points to one of the marks (31) consisting of numbers from "1" to "12" on the outer shell (3). Thus, the marking device (1) can mark the date on the molded product. In the example shown in FIG. 2, it is possible to write a letter meaning “December 2009” on the molded product.
On the upper surface of the index shaft (5), a linear mark portion (51) extending along the diameter of the index shaft (5) is engraved. A tip of a tool such as a flat-blade screwdriver can be inserted into the mark portion (51). The index axis (5) is rotated by rotating the tool.

The index shaft (5) has a trapezoidal cone-shaped head (52) that narrows downward, and a leg (53) that extends from the head (52) toward the bottom (32) of the outer shell (3). ). The lower end of the leg portion (53) is screwed into a screw hole formed at the center of the bottom portion (32) of the outer shell body (3), and the index shaft (5) is connected to the outer shell body (3).
The rotating cylinder (4) has a shorter axial length than the outer shell (3), and a space is formed between the lower surface of the rotating cylinder (4) and the upper surface of the bottom (32) of the outer shell (3). The In this space, a washer (6) and a nut (7) are arranged. The washer (6) and the nut (7) are connected and fixed to the index shaft (5).

  The rotating cylinder (4) includes a trapezoidal cone-shaped head (42) that narrows downward, a cylindrical trunk (43) that extends downward from the head (42), and a trunk (43). It consists of a leg part (44) that extends downward and has a diameter smaller than that of the body part (43). A concave portion is formed on the lower surface of the leg portion (44) of the rotating cylinder (4), and the ratchet ring (8) is fitted into the concave portion and fixed.

FIG. 3 is a diagram showing the structure of the outer shell (3). FIG. 3A is a plan view of the outer shell body (3), and FIG. 3B is a longitudinal sectional view of the outer shell body (3).
As described above, the outer shell (3) has a substantially one-end-bottomed cylindrical shape. At the center of the bottom (32) of the outer shell (3), a screw hole (321) that is screwed with the lower end of the leg (53) of the index body (5) is formed.
The inner space of the outer shell (3) is a trapezoidal conical head receiving space (331) surrounded by the inner wall (33) of the outer shell (3) inclined with respect to the axis of the outer shell (3). And a trunk housing space (341) surrounded by the inner wall (34) of the outer shell (3) parallel to the axis of the outer shell (3).
The head receiving space (331) has a shape complementary to the head (42) of the rotating cylinder (4), but has a slightly longer axial length than the head (42) of the rotating cylinder (4). . In addition, in FIG.3 (b), the lower end position of the head (42) of a rotation cylinder (4) is shown with a dashed-two dotted line. When the head accommodating space (341) completely accommodates the head (42) of the rotating cylinder (4), the upper surface of the outer shell (3) and the upper surface of the rotating cylinder (4) are flush with each other. The inner wall (33) of the outer shell (3) forming the space (341) and the outer peripheral surface of the head (42) of the rotating cylinder (4) are in contact.
The trunk housing space (341) is formed to be slightly smaller in diameter than the lower end of the head housing space (331), and a step portion is provided at the boundary between the trunk housing space (341) and the head housing space (331). (335) is formed. Twelve concave grooves (342) are formed at equal intervals on the inner wall (34) of the outer shell (3) forming the trunk portion accommodating space (341). The cross section of the groove (342) is substantially U-shaped, and the depth of the groove (342) is substantially equal to the thickness of the step (335). The concave grooves (342) correspond to the positions of the mark portions (31) formed on the upper surface of the outer shell body (3), and on the line connecting the mark portions (31) from the center point of the outer shell body (3). A concave groove (342) is formed. The concave groove (342) extends downward from the boundary between the trunk portion accommodating space (341) and the head accommodating space (331). When the head (42) of the rotating cylinder (4) is completely accommodated in the head accommodating space (331) of the outer shell (3), the outer peripheral surface of the trunk (43) of the rotating cylinder (4) is The inner wall (34) forming the trunk portion accommodating space (341) of the outer shell (3) is brought into contact.

FIG. 4 is a view showing the structure of the rotating cylinder (4). 4 (a) is a plan view of the rotating cylinder (4), FIG. 4 (b) is a side view of the rotating cylinder (4), and FIG. 4 (c) is a bottom view of the rotating cylinder (4). FIG. 4 (d) is a longitudinal sectional view of the rotating cylinder (4).
As described above, the rotating cylinder (4) has a substantially cylindrical shape, a trapezoidal cylindrical head (42), and a cylindrical trunk (43) extending downward from the lower surface of the head (42), It consists of a leg part (44) extended below from a lower surface of a trunk | drum (43). The diameter of the trunk portion (43) is smaller than the lower surface of the head portion (42), and a step portion (425) is formed at the outer peripheral boundary between the trunk portion (43) and the head portion (42). Moreover, the diameter of the leg part (44) is formed smaller than the trunk | drum (43), and the step part (435) is formed in the outer periphery boundary of a leg part (44) and a trunk | drum (43).
The rotating cylinder (4) includes a through hole (45), and the through hole (45) extends along the axis of the rotating cylinder (4). The through hole (45) includes a head housing space (451) for housing the head (52) of the index shaft (5) and a leg housing space (452) for housing the leg (53) of the index shaft (5). ) And a ratchet ring accommodating space (453) for accommodating the ratchet ring (8).
In the illustrated example, the head receiving space (451) has a shape that is completely complementary to the head (52) of the index shaft (5), but the axial length of the head receiving space (451) is the index axis. It may be formed longer than the axial length of the head (52) of (5). When the head accommodating space (451) completely accommodates the head (52) of the index shaft (5), the upper surface of the rotary cylinder (4) and the upper surface of the index shaft (5) are flush with each other, and the head accommodating space (451 ) Forming the inner wall (454) of the rotating cylinder (4) and the outer peripheral surface of the head (52) of the index shaft (5). The leg storage space (452) extends straight downward from the lower end of the head storage space (451). It is preferable that a slight gap is formed between the inner wall (455) of the rotating cylinder (4) forming the leg portion accommodating space (452) and the peripheral surface of the indicator shaft (5). A circular ratchet ring accommodating space (453) is formed on the lower surface of the leg portion (44) of the rotating cylinder (4), and the ratchet ring accommodating space (453) is connected to the leg portion accommodating space (452). The ratchet ring (8) is fitted into the ratchet ring accommodating space (453).

The trunk (43) of the rotating cylinder (4) includes a receiving hole (431), and the receiving hole (431) extends in the axial direction of the rotating cylinder (4). A coil spring (432) is disposed in the accommodation hole (431). The proximal end portion of the coil spring (432) is connected to the accommodation hole (431). A spherical engagement ball (433) is attached to the tip of the coil spring (432). A part of the engaging ball (433) protrudes from the outer peripheral surface of the body (43) of the rotating cylinder (4).
The structure of the receiving hole (431), the coil spring (432) and the engaging ball (433) of the rotating cylinder (4), and the concave groove (342) formed on the inner peripheral surface of the outer shell (3) is the rotating cylinder (4). ). When the rotating cylinder (4) rotates around the axis of the rotating cylinder (4), the engaging ball (433) meshes with the concave groove (342), and the rotating cylinder (4) can be stopped at a predetermined position. As a result, the triangular mark (41) engraved on the upper surface of the rotating cylinder (4) can be easily aligned with the mark (31) engraved on the upper surface of the outer shell (3).

FIG. 5 is a side view of the index axis (5), and a part of the index axis (5) shown in FIG. 5 is shown as a cross section.
As described above, the index axis (5) has a substantially cylindrical shape, and includes a trapezoidal columnar head (52) and a columnar leg (53) extending downward from the lower surface of the head (52). .
The leg portion (53) includes a screw portion (531) formed below the index shaft (5) and a non-screw portion (532) connecting the screw portion (531) and the head portion (52). A neck portion (533) formed narrower than the other portions of the leg portion (5) is formed in the middle portion of the screw portion (531). A washer (6) is fitted into the neck (533). The nut (7) is screwed in the section from the neck (533) to the terminal end (534) of the screw (531). When the head (52) of the index shaft (5) is completely accommodated in the head accommodating space (451) of the rotary cylinder (4), the terminal end (534) of the screw part (531) It is located slightly below the lower surface of 4). As a result, a slight gap is formed between the upper surface of the nut (7) screwed into the screw portion (531) and the lower surface of the rotating cylinder (4).
The non-screw portion (532) includes a receiving hole (534). The accommodation hole (534) extends in the axial direction of the index axis (5). A coil spring (535) is disposed in the accommodation hole (534). The proximal end of the coil spring (535) is fixed to the bottom of the accommodation hole (534). A spherical control sphere (536) is attached to the tip of the coil spring (535). A part of the control ball (536) protrudes from the outer peripheral surface of the non-screw part (532).

FIG. 6 is a plan view of the ratchet ring (8).
The ratchet ring (8) consists of a substantially annular thin plate. In FIG. 8, a circle indicated by a dotted line indicates the position of the outer peripheral surface of the non-screw portion (532) of the index shaft (5). A control space (81) extending in the radial direction is formed inside the ratchet ring (8). FIG. 8 shows seven control spaces (81). The control space (81) can accommodate a control ball (536) that appears outward from the outer peripheral surface of the non-screw portion (532) of the index shaft (5) and protrudes from the outer peripheral surface of the non-screw portion (532).
The control space (81) includes a first edge (821) and a second edge (822) extending from the inner edge (82) of the ratchet ring (8) contacting the non-threaded portion (532) of the index shaft (5). The first edge (821) and the second edge (822) are formed from a third edge (823) connecting the tips, and have a substantially trapezoidal shape. The first edge (821) has a steep slope with respect to the tangent to the outer peripheral surface of the non-screw part (532) of the index shaft (5) at the base end point (824) of the first edge (821), and the second edge (822) forms a gentle gradient with respect to the tangent to the outer peripheral surface of the non-threaded portion (532) of the index shaft (5) at the base end point (825) of the second edge (822).
The ratchet ring (8) is fixedly fitted in the ratchet ring accommodating space (453) of the rotating cylinder (4) and operates following the rotating cylinder (4). After the control sphere (536) of the index axis (5) is disposed in the control space (81), when the index axis (5) is rotated counterclockwise, the control sphere (536) has the first edge (821). The rotating cylinder (4) rotates counterclockwise together with the index shaft (5). On the other hand, when the index shaft (5) is rotated clockwise, the control ball (536) is guided by the second edge (822) and enters the accommodation hole (534) formed in the non-screw portion (532). The driving force applied to the index shaft (5) is not transmitted to the rotating cylinder (4), and the rotating cylinder (4) remains stationary.

FIG. 7 is a plan view of the washer (6).
The washer (6) is formed from a substantially C-shaped thin plate. The washer (6) shown in FIG. 7 includes three tongue pieces (61) protruding toward the washer (6) axis. The tongue piece (61) meshes with a neck portion (533) formed on a screw portion (531) of the index shaft (5). The upper surface of the washer (6) contacts the lower surface of the nut (7) to prevent the nut (7) from loosening.

FIG. 8 shows an assembling procedure of the marking device (1).
First, the ratchet ring (8) is fitted into the ratchet ring accommodating space (453) on the lower surface of the rotating cylinder (4), and the index shaft (5) is inserted into the through hole (45) of the rotating cylinder (4). Thereafter, the nut (7) is screwed into the screw portion (531) of the index shaft (5) projecting downward from the lower surface of the rotating cylinder (4), and the nut (7) is extended to the end portion (534) of the screw portion (531). ). Thereafter, the washer (6) is fitted into the neck portion (533) of the screw portion (531) to construct the internal structure (9) composed of the rotating cylinder (4) and the index shaft (5).

Fig.8 (a) is sectional drawing which shows the state which inserted the internal structure (9) in the outer shell (3). In the state shown in FIG. 8A, the screw part (531) of the index shaft (5) and the screw hole (321) of the bottom part (32) of the outer shell (3) are not screwed together.
In the state shown in FIG. 8A, the rotating cylinder (4) moves downward with respect to the index axis (5) by the action of gravity, and the lower surface of the rotating cylinder (4) is the upper surface of the nut (7). Abut. The upper surface of the nut (7) gives an upward reaction force against the gravity acting on the rotating cylinder (4) to the rotating cylinder (4), and keeps the rotating cylinder (4) floating from the outer shell ( 3 ). Therefore, the outer peripheral surface of the head portion (42) of the rotating cylinder (4) is separated from the inner wall (33) forming the head housing space (331) of the outer shell body (3), and the outer shell body (331). No frictional force is generated between the inner wall (33) and the outer peripheral surface of the head (42) of the rotating cylinder (4). Further, since the rotary cylinder (4) is moved downward with respect to the index axis (5), the outer surface of the head (52) of the index axis (5) and the head accommodating space of the rotary cylinder (4). A gap is formed between the inner wall (454) forming (451) and the frictional force between the outer peripheral surface of the head (52) of the index shaft (5) and the inner wall (454) of the rotating cylinder (4) is also generated. Does not occur. As a result, it is possible to reduce the driving force required to rotate the index shaft (5).

In FIG. 8B, the screw portion (531) of the index shaft (5) and the screw hole (321) of the outer shell body (3) are advanced, and the upper surface of the rotating cylinder (4) and the outer shell body (3) are moved. ) Shows the state at the moment when the top surface is flush.
As shown in FIG. 8 (a), before the screwing of the screw portion (531) of the index shaft (5) and the screw hole (321) of the outer shell (3) starts, the upper surface of the rotating cylinder (4) Is located above the upper surface of the outer shell (3). When the index shaft (5) is rotated and the screw portion (531) and the screw hole (321) are screwed together, the rotating cylinder (4) is supported by the nut (7), and together with the index shaft (5), The outer shell (3) enters the internal space.
In the structure of the ratchet ring (8) shown in FIG. 6, in order to advance the screwing between the screw portion (531) of the index shaft (5) and the screw hole (321) of the outer shell (3), the index shaft (5 ) Is rotated clockwise, the driving force from the tool that rotates the index shaft (5) is hardly transmitted to the rotating cylinder (4). Accordingly, the upper surface of the nut (7) and the lower surface of the rotating cylinder (4) are rubbed, but the nut (7) is prevented from loosening by the washer (6).

FIG. 8C shows a state in which the screwing of the screw portion (531) of the index shaft (5) and the screw hole (321) of the outer shell (3) is further advanced.
When the upper surface of the rotating cylinder (4) is flush with the upper surface of the outer shell (3), the head (42) of the rotating cylinder (4) is placed in the head housing space ( 331) is supported by the inner wall (33). As a result, even if the screw portion (531) of the index shaft (5) and the screw hole (321) of the outer shell (3) are further advanced and the index shaft (5) is further moved downward, the rotating cylinder (4) does not move downward. For this reason, when the index shaft (5) is further moved downward, the upper surface of the nut (7) and the lower surface of the rotating cylinder (4) are separated from each other. Due to the separation between the upper surface of the nut (7) and the lower surface of the rotating cylinder (4), the rotation of the index shaft (5) is hardly affected by the rotating cylinder (4). As a result, the index shaft (5) can be rotated with a very small force until the upper surface of the index shaft (5) is flush with the upper surface of the rotating cylinder (4).
After the upper surface of the index shaft (5) and the upper surface of the rotary cylinder (4) are flush with each other, the index shaft (5) is further tightened to complete the marking device (1).

FIG. 9 is a diagram for explaining the action of preventing the molten material from flowing in.
As described above, when the index shaft (5) is tightened, the index shaft (5) slightly expands, and an elastic force (F) is generated inside the index shaft (5). Generation of the elastic force (F) generates a component force (f) in a direction perpendicular to the tapered outer peripheral surface of the head (52) of the index shaft (5), and this component force (f) is the index shaft. (5) The head is pressed against the inner wall (454) of the rotating cylinder (4), and the molten material flows into the marking device (1) from the boundary between the index shaft (5) and the rotating cylinder (4). Can be prevented. Further, the component force (f) has an effect of pressing the head (42) of the rotating cylinder (4) against the inner wall (33) of the outer shell (3), and the rotating cylinder (4) and the outer shell (3). It is possible to prevent the molten resin from flowing into the marking device (1) from the boundary between the two.

  The outer shell (3), the rotating cylinder (4) and the index shaft (5) may be formed from different materials. For example, by forming the index shaft (5) from a material having a higher coefficient of thermal expansion than that of the rotating cylinder (4), the head (52) of the index shaft (5) and the rotating cylinder (4) are placed in a high heat environment. It is possible to further increase the pressure. Further, by forming the rotating cylinder (4) from a material having a higher coefficient of thermal expansion than that of the outer shell (3), the head (42) and outer shell (3) of the rotating cylinder (4) under a high heat environment. ) Can be further increased.

FIG. 10 shows a modification of the index axis (5).
As shown in FIG. 10, one or more annular grooves (521) may be formed along the outer peripheral surface of the head (52) of the index shaft (5). This reduces the contact area between the head (52) of the index shaft (5) and the inner wall (454) of the rotating cylinder (4), and the head (52) of the index shaft (5) and the rotating cylinder (4). ) At the contact portion with the inner wall (454).

FIG. 11 shows a modified form of the rotating cylinder (4). Fig.11 (a) is a longitudinal cross-sectional view of the rotation cylinder (4) which concerns on a modification, and FIG.11 (b) is a side view of the rotation cylinder (4) which concerns on another modification.
As shown in FIG. 11 (a), one or more annular grooves (459) may be formed along the inner wall (454) forming the head housing space (451) of the rotating cylinder (4). . This reduces the contact area between the head (52) of the index shaft (5) and the inner wall (454) of the rotating cylinder (4), and the head (52) of the index shaft (5) and the rotating cylinder (4). ) At the contact portion with the inner wall (454).
As shown in FIG. 11 (b), one or more annular grooves (421) may be formed along the outer peripheral surface of the head (42) of the rotating cylinder (4). This reduces the contact area between the head (42) of the rotating cylinder (4) and the inner wall (33) of the outer shell (3), and the head (42) and outer shell of the rotating cylinder (4). It becomes possible to raise the pressure in a contact part with the inner wall (33) of (3).

FIG. 12 shows a modified form of the outer shell (3).
As shown in FIG. 12, one or more annular grooves (332) may be formed along the inner wall (33) forming the head housing space (331) of the outer shell (3). This reduces the contact area between the head (42) of the rotating cylinder (4) and the inner wall (33) of the outer shell (3), and the head (42) and outer shell of the rotating cylinder (4). It becomes possible to raise the pressure in a contact part with the inner wall (33) of (3).

FIG. 13 shows another modification of the rotating cylinder (4) and the outer shell (3). 13 (a) is a longitudinal sectional view of the rotating cylinder (4), FIG. 13 (b) is a side view of the rotating cylinder (4), and FIG. 13 (c) is an outer shell (3). FIG.
When the diameter of the marking device (1) is reduced, the width dimension and the depth dimension of the engagement groove (342) for determining the rotational position of the rotary cylinder (4) are reduced. As a result, the amount of engagement between the engagement groove (342) and the engagement ball (433) becomes small, and a sufficient positioning function cannot be exhibited.
In the example shown in FIG. 13, the rotating cylinder (4) includes a pair of receiving holes (431), a coil spring (432) disposed in each receiving hole (431), and an engagement ball ( 433). The axes of the pair of receiving holes (431) are perpendicular to the center line of the rotating cylinder (4). Moreover, a pair of accommodation hole (431) is distribute | arranged on the same horizontal surface.
In the example shown in FIG. 3, the engaging groove (342) is arranged so as to correspond to each of the mark portions (51) engraved on the upper surface of the outer shell (3), but the outer shell shown in FIG. The engagement grooves (342) of the body (3) are arranged so as to correspond to even numbers among the numbers from “1” to “12” carved on the upper surface of the outer shell body (3). 3 is half of the engaging groove (342) of the outer shell (3) shown in FIG.

FIG. 14 is a view showing the relationship between the engaging ball (433) and the engaging groove (342) when the rotating cylinder (4) and the outer shell (3) shown in FIG. 13 are used. In FIG. 14, one engagement sphere is indicated by reference numeral (433a), and the other engagement sphere is indicated by reference numeral (433b).
In the state shown in FIG. 14 (a), the engagement ball (433a) has an engagement groove (342) corresponding to the mark portion (31) represented by the numeral “6” on the upper surface of the outer shell (3). Is engaged. The engaging ball (433b) has an engagement groove (342) corresponding to the mark portion (31) represented by the numeral “8” and a mark corresponding to the mark portion (31) represented by the numeral “10”. It contacts the inner wall (34) of the outer shell (3) between the mating grooves (342).
FIG. 14B shows a state in which the index axis (5) is rotated 30 ° clockwise. In the state shown in FIG. 14B, the engagement ball (433a) is represented by the engagement groove (342) corresponding to the mark portion (31) represented by the numeral “6” and the numeral “8”. It contacts the inner wall (34) of the outer shell (3) between the engagement grooves (342) corresponding to the mark portions (31). The engagement ball (433b) engages with an engagement groove (342) corresponding to a mark portion (31) indicated by a numeral “10” on the upper surface of the outer shell (3).
FIG. 14C shows a state in which the index axis (5) is further rotated clockwise by 30 °. In the state shown in FIG. 14 (c), the engagement ball (433 a) has an engagement groove (342) corresponding to the mark portion (31) represented by the numeral “8” on the upper surface of the outer shell (3) Engage. The engagement ball (433b) is an engagement groove (342) corresponding to the mark part (31) represented by the numeral “10” and the mark corresponding to the mark part (31) represented by the numeral “12”. It contacts the inner wall (34) of the outer shell (3) between the mating grooves (342).
In this way, the number of the engagement grooves (342) formed in the inner wall (34) of the outer shell (3) is halved and the width dimension of the engagement groove (342) is increased, whereby the engagement grooves A sufficient amount of engagement between (342) and the engagement ball (433) can be ensured.

FIG. 15 is a longitudinal sectional view showing another modification of the outer shell (3).
In the example shown in FIGS. 2 to 14, the engagement groove (342) is formed in the outer shell body (3). Instead of the engagement groove (342), the peripheral wall of the outer shell body (3) is formed in the radial direction. A penetrating engagement hole (343) may be formed. The engagement holes (343) are arranged at equal intervals along the peripheral wall of the outer shell (3), and are each engraved on the upper surface of the outer shell (3), like the above-mentioned engagement grooves (342). This corresponds to the mark (31). When the upper surface of the rotating cylinder (4) is flush with the upper surface of the outer shell (3), the exposed portion of the engaging ball (433) enters the inner end of the engaging hole (343). Then, positioning with respect to the rotating cylinder (4) is performed.

FIG. 16 is a longitudinal sectional view showing a reference form of the marking device (1).
The marking device (1) shown in FIG. 16 has substantially the same structure as the marking device (1) shown in FIG. 2, but the nut (7) and washer (6) used to push up the rotating cylinder (4). Instead, a difference is that a coil spring (76) is used. Further, the difference is that the neck portion (533) is not formed on the screw portion (531) of the index shaft (5). Furthermore, a lid portion (81) for preventing the ratchet ring (8) from being detached together with the ratchet ring (8) is fitted in the ratchet ring accommodating space (453) of the rotating cylinder (4). Note that the structure in which the lid portion (81) is arranged together with the ratchet ring (8) can be applied to the marking device (1) shown in FIGS.
The coil spring (76) is disposed in a space formed between the lower surface of the rotating cylinder (4) and the upper surface of the bottom (32) of the outer shell (3). The lower end of the coil spring (76) contacts the upper surface of the bottom (32) of the outer shell (3), and the upper end of the coil spring (76) contacts the lower surface of the rotating cylinder (4). When the upper surface of the rotating cylinder (4) is flush with the outer shell (3), the coil spring (76) is compressed and pushes the rotating cylinder (4) out of the opening on the upper surface of the outer shell (3). Apply power.

FIG. 17 is a diagram showing a procedure for assembling the marking device (1) shown in FIG.
First, the ratchet ring (8) and the lid (81) are fitted into the ratchet ring accommodating space (453) on the lower surface of the rotating cylinder (4), and the index shaft (5) is inserted into the through hole (45) of the rotating cylinder (4). Thus, an internal structure (9) composed of the rotating cylinder (4) and the index axis (5) is constructed. A coil spring (76) is disposed in the outer shell (3).

FIG. 17A is a cross-sectional view showing a state in which the internal structure (9) is inserted into the outer shell (3). In the state shown in FIG. 17A, the screw portion (531) of the index shaft (5) and the screw hole (321) of the bottom portion (32) of the outer shell (3) are not screwed together.
In the state shown in FIG. 17 (a), the rotating cylinder (4) is forced upward by the coil spring (76), and the upper surface of the rotating cylinder (4) and the upper surface of the index shaft (5) are flush with each other. It has become. At this time, the outer peripheral surface of the head (42) of the rotating cylinder (4) is separated from the inner wall (33) forming the head housing space (331) of the outer shell (3), and the outer shell (331). No frictional force is generated between the inner wall (33) of the cylinder and the outer peripheral surface of the head (42) of the rotating cylinder (4). As a result, it is possible to reduce the driving force required to rotate the index shaft (5).

FIG. 17B is a cross-sectional view showing a state at the moment when the upper surfaces of the index shaft (5), the rotating cylinder (4), and the outer shell (3) are flush with each other.
When the screw portion (531) of the index shaft (5) and the screw hole (321) of the outer shell (3) are advanced, the rotary cylinder (4) is moved to the head (52) of the index shaft (5). Moves downward while being pressed. Therefore, the outer surface of the head (42) of the rotating cylinder (4) and the head of the outer shell (3) until the upper surface of the rotating cylinder (4) is flush with the upper surface of the outer shell (3). A frictional force is not generated between the inner wall (33) forming the accommodation space (331), and the index shaft (5) can be rotated with a small force.

  In the marking device (1) described with reference to FIGS. 16 and 17, the surface of the ratchet ring (8) shown in FIG. 6 is used as the bottom surface, and the index shaft (5) is rotated clockwise to form the outer shell body. While the screwing with the screw hole (321) of the bottom (32) of (3) is proceeding, the control ball (536) attached to the index shaft (5) is moved to the first edge of the ratchet ring (8) ( 821). As a result, the index shaft (5) and the rotating cylinder (4) rotate integrally, and the relative rotational movement between the index shaft (5) and the rotating cylinder (4) can be prevented, and the index shaft (5) and the outer shell can be prevented. Connection with a body (3) can be performed suitably.

FIG. 18 shows a further simplified form of the structure of the marking device (1) described in relation to FIGS. FIG. 18A is a plan view of the marking device (1), and FIG. 18B is a longitudinal sectional view of the marking device (1).
The marking device (1) shown in FIG. 18 does not include a ratchet ring (8), a lid portion (81), and a ratchet ring housing space (453) for housing the ratchet ring (8) and the lid portion (81). This is different from the marking device (1) shown in FIGS. The coil spring (76) is wound around the leg (44) of the rotating cylinder (4) and attached to the rotating cylinder (4). A structure in which the coil spring (76) is wound around the leg portion (44) of the rotating cylinder (4) can be employed in the marking device (1) shown in FIGS.
Further, the linear mark portion (51) formed on the upper surface of the index axis (5) crosses the upper surface of the index axis (5) along the diameter of the upper surface of the index axis (5). Further, a triangular marking portion (41) is engraved on the upper surface of the rotary cylinder (4) of the marking device (1) described with reference to FIGS. 2 to 17, but the marking device shown in FIG. In (1), instead of the triangular mark portion (41), an arrow-shaped mark portion (41) is engraved. Moreover, the linear part of the arrow-shaped mark part (41) extends to the inner edge of the rotary cylinder (4) and is formed so as to be able to communicate with the mark part (51) of the index shaft (5).
When the marking device (1) shown in FIG. 18 rotates the index shaft (5) alone, a tool having a linear tip portion shorter than the diameter of the index shaft (5) is prepared, and the tool tip is moved to the index shaft ( 5) Insert into the mark (51). When both the index shaft (5) and the rotating cylinder (4) are rotated, the index shaft (5) is rotated, and the mark portion (51) of the index shaft (5) is moved to the arrow-shaped mark portion ( 41). In this state, the tool tip is inserted into the marking portions (51, 41) so as to cross the boundary between the index shaft (5) and the rotating cylinder (4), and the index shaft (5) and the rotating cylinder (4) are rotated.

  The present invention can be suitably used for a molding process using a molten material having a low kinematic viscosity.

DESCRIPTION OF SYMBOLS 1 ... Marking device 2 ... Mold apparatus 3 ... Outer shell body 32 ... Bottom part 321 ... Screw hole 33 ... Inner wall 332 ... Annular groove 342 ... engaging groove 343 ... engaging hole 4 ... rotating cylinder 42 ... head 421 ... annular groove 431 ... receiving hole 432 ... coil spring 433 ... Engagement sphere 45... Through hole 454 ... inner wall 459 ... annular groove 5 ... index shaft 52 ... head 521 ... annular groove 53 ... leg 531 ... Screw part 533 ... Neck part 534 ... Housing hole 535 ... Coil spring 536 ... Control ball 534 ... End part 6 ... Washer 7 ... Nut 76 ... ..Coil spring 8 ... Ratchet ring 821 ... first edge 822 ... second edge

Claims (14)

A cylindrical outer shell having a first end and a first engraving surface facing the cavity of the mold apparatus and fixed to the mold apparatus;
A rotating cylinder that is arranged inside the outer shell through an opening formed in the first engraving surface and has a second engraving surface that is flush with the first engraving surface;
A head portion having a third engraving surface that is flush with the second engraving surface, and a leg portion formed with a screw portion that engages with a screw hole in the bottom portion of the outer shell body, and the rotation An index shaft that is inserted into the rotary cylinder through a through-hole formed along the axis of the cylinder and connected to the bottom of the outer shell;
While the index shaft and the outer shell body are screwed together, an upward reaction force against the gravity acting on the rotating cylinder is applied to the rotating cylinder, and the rotating cylinder is kept floating from the outer shell body. ,
The head portion of the index shaft is formed in a trapezoidal cone shape that narrows toward the inside of the outer shell body,
The rotating cylinder has an outer periphery that forms an inner peripheral surface that contacts the outer peripheral surface of the head portion of the index shaft, and a trapezoidal conical head portion that narrows from the second engraved surface toward the inside of the outer shell body. With a surface,
The outer shell may e Bei the inner peripheral surface the outer peripheral surface and abutting the head of the rotary cylinder,
The mechanism comprises a protrusion that is fixed to the leg portion of the indicator shaft and extends in a radial direction of the indicator shaft,
Before the third engraved surface is flush with the second engraved surface, the protrusion comes into contact with the bottom surface of the rotating cylinder, and supports the rotating cylinder.
The marking device , wherein when the third engraving surface is flush with the second engraving surface, the projecting portion is separated from the bottom surface of the rotating cylinder . The protrusion is marking apparatus according to claim 1, characterized in that the annular plate. The screw portion of the index shaft includes a terminal portion located in the middle of the leg portion of the index shaft,
The marking device according to claim 2 , wherein the annular plate is a nut that is screwed to the end portion . The annular plate further comprises a C-shaped washer;
The screw portion of the index shaft includes an annular groove at a position spaced from the end portion ,
4. The marking device according to claim 3 , wherein the washer is fitted into the annular groove and abuts against one surface of the nut. The thermal expansion coefficient of the material constituting the rotary cylinder is marking apparatus according to any one of claims 1 to 4, wherein the higher than the thermal expansion coefficient of the material constituting the outer shell. The marking device according to any one of claims 1 to 5 , wherein a thermal expansion coefficient of a material constituting the index axis is higher than a thermal expansion coefficient of a material constituting the rotary cylinder. Axial length dimension of said head portion of said rotary cylinder is one of claims 1 to 4, characterized in that shorter than the axial length dimension of the head accommodating space of the outer shell for housing the head of said rotary cylinder The marking device according to the above. Axial length dimension of said head of the indicator shaft, according to claim 1 to 4 or to being shorter than the axial length dimension of the rotary cylinder head accommodating space for accommodating the head of the indicator shaft The marking device described in. The axial length dimension of the head portion of the rotating cylinder is shorter than the axial length dimension of the head accommodating space of the outer shell body that accommodates the head portion of the rotating cylinder,
The thermal expansion coefficient of the material constituting the rotary cylinder is marking apparatus according to any one of claims 1 to 4, wherein the higher than the thermal expansion coefficient of the material constituting the outer shell. The axial length dimension of the head portion of the index shaft is shorter than the axial length dimension of the head housing space of the rotary cylinder that houses the head portion of the index shaft,
The thermal expansion coefficient of the material constituting the index axis, marking apparatus according to any one of claims 1 to 4, wherein the higher than the thermal expansion coefficient of the material of the rotary cylinder. The marking device according to any one of claims 1 to 10 , wherein the inner peripheral surface of the outer shell body that abuts on the outer peripheral surface of the head of the rotating cylinder includes at least one annular groove. The marking device according to any one of claims 1 to 10 , wherein the outer peripheral surface of the head of the rotating cylinder includes at least one annular groove. The marking device according to any one of claims 1 to 12 , wherein the inner peripheral surface of the rotary cylinder that contacts the outer peripheral surface of the head of the index shaft includes at least one annular groove. The marking device according to any one of claims 1 to 12 , wherein the outer peripheral surface of the head of the index shaft includes at least one annular groove.

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