Marking device

Abstract

The invention provides an engraving device which is simple in structure, capable of reliably resetting and capable of enabling an index body to accurately rotate for a cycle, embedded into a concave part of a forming die and comprises a hollow cylinder body, a first hole, a second hole, a first rotating shaft and a second rotating shaft, the driving part is provided with a first base body and a second base body; the first base body is provided with a first sawtooth part on the periphery of the first hole in the hollow cylinder; the second base body is provided with a second sawtooth part embedded into the first base body; the first connecting rod is fixed on the second base body and extends to the lower part of the engraving device through the first hole; a first driving / driven part including a third base body provided with a third serrated part that meshes with the first serrated part and the second serrated part, and provided with a fourth serrated part on a surface opposite to a surface on which the third serrated part is provided; the second driving and driven part comprises a fourth base body and a second connecting rod, the fourth base body is provided with a fifth sawtooth part meshed with the fourth sawtooth part, and the second connecting rod is connected with the fourth base body and is provided with a cylindrical expanded head part; an index body is arranged on the upper side of the head.

Description

Technical Field

[0001] This invention relates to an engraving device. Background Technology

[0002] In an injection molding machine, a movable mold base plate (movable type) moves towards or away from a fixed mold base plate (fixed type), thereby achieving mold closing (mold closure) and mold opening (mold opening) of the mold base plate. Molten synthetic resin is supplied into the cavity inside the closed mold, and after the molten synthetic resin solidifies, a molded product is formed.

[0003] When mass-producing products, it is necessary to engrave manufacturing numbers or manufacturing dates on the product surface, so an engraving device is used. The engraving method for manufacturing numbers or manufacturing dates is as follows: the engraving device, which has an engraving display, is inserted into the cavity side of the molding die, and the die is formed in the inserted state, so that the engraving content is directly engraved onto the surface of the molded product.

[0004] An engraving device has been proposed in the prior art. This device can prevent operators from working in unreasonable postures, prevent body parts from contacting the mold substrate and being burned, and can also change the display of the indicator. It also has excellent heat resistance and durability, simple structure and low cost (for example, see Patent Document 1). The engraving device described in Patent Document 1 includes: an outer shell with text or symbols engraved on the circumference of the upper end face of a hollow cylindrical body; an upper drive / driven mechanism disposed on the upper part of the hollow part of the outer shell; and a lower drive mechanism disposed on the lower part of the hollow part of the outer shell.

[0005] Patent Document 1 discloses an engraving device that uses air pressure generated by a lower drive mechanism to drive a connecting rod, and rotates a display unit through the meshing of serrated portions within an upper drive / driven mechanism and the meshing of the serrated portions with protrusions on a rotor. This engraving device comprises: a hollow cylindrical outer shell with text or symbols engraved on its upper end circumference; an upper drive / driven mechanism disposed on the upper part of the hollow portion of the outer shell; and a lower drive mechanism disposed on the lower part of the hollow portion of the outer shell. The upper drive / driven mechanism includes: an outer cylinder fixed inside the outer shell with a meshing portion at its upper end; an inner cylinder fitted within the outer cylinder with a meshing portion at its upper end; a rotor fitted within the outer shell and composed of a solid or hollow cylinder; and a force-applying means for applying a downward force to the rotor. The inner cylinder is connected to the piston via a connecting rod. In the first state, the rotor engages with the outer cylinder, and in the second state, it disengages. In the first state, the rotor disengages from the inner cylinder, and in the second state, it engages with the inner cylinder. The lower drive mechanism includes: a cylinder that introduces compressed air through a vent connected to a compressed air source; and a piston that is embedded in the cylinder and driven by compressed air, the cylinder being fitted into the outer casing.

[0006] The engraving device utilizes the engagement and disengagement of the rotor with the serrated portion of the outer cylinder, and the engagement and disengagement of the rotor with the serrated portion of the inner cylinder (which is in a different phase from the serrated portion of the outer cylinder), to move the protrusion of the rotor by one tooth pitch, thereby causing the index body to rotate one cycle. The inner surface of the outer cylinder is provided with a longitudinal slit, while the outer surface of the inner cylinder is provided with ribs.

[0007] However, in the marking device of Patent Document 1, the protrusion at the lower part of the rotor engages with the serrations of the second serration of the inner cylinder to drive the rotor to rotate; during resetting, the protrusion engages with the outer cylinder. Therefore, by simply moving the inner cylinder up and down, it is sometimes impossible to reset the serration of the inner cylinder to the correct position, thus causing the index body to not rotate accurately for one cycle.

[0008] [Preliminary Technology Documents] [Patent Documents] [Patent Document 1] Patent No. 7239195. Summary of the Invention

[0009] The inventors have conducted in-depth research to solve the above-mentioned problems, aiming to provide an engraving device with a simple structure, reliable resetting capability, and the ability to accurately rotate the indicator body for one cycle.

[0010] The engraving device according to claim 1 of this invention is an engraving device embedded in the recess of a molding die, characterized in that the engraving device comprises: A hollow cylindrical body with a first hole in the center of its bottom; The driving unit includes: a first base having a first serrated portion around the periphery of the first hole in the hollow cylinder; a second base having a second serrated portion embedded inside the first base; and a first connecting rod fixed to the second base and extending through the first hole to the lower part of the engraving device. The first drive / driven part has a third base, on which a third sawtooth part is provided that meshes with the first sawtooth part and the second sawtooth part, and a fourth sawtooth part is provided on the surface opposite to the surface on which the third sawtooth part is provided. The second drive / driven part has a fourth base and a second connecting rod. The fourth base has a fifth serrated part that meshes with the fourth serrated part. The second connecting rod is connected to the fourth base and has a cylindrical, enlarged head. An index body is provided on the upper side of the head.

[0011] The engraving apparatus according to claim 2 of the present invention is characterized in that the second driving / driven unit further includes: A cover portion is provided on the upper part of the hollow cylinder and has a cylindrical portion that protrudes in a cylindrical shape in the center. The fifth base, located below the cover, is fixed to the hollow cylinder, and has a sixth serrated portion on its upper surface; The second connecting rod passes through the cover and the fifth base. The second connecting rod has a seventh sawtooth portion on the lower side of the head that meshes with the sixth sawtooth portion.

[0012] The engraving device according to claim 3 of the present invention is characterized in that: the first sawtooth portion and the second sawtooth portion have sawtooths with the same period; when the second substrate is embedded in the first substrate, the sawtooths of the first sawtooth portion and the sawtooths of the second sawtooth portion are arranged in a staggered period, and the third sawtooth portion meshes with the first sawtooth portion.

[0013] The engraving device according to claim 4 of the present invention is characterized in that: the periodic offset between the saw teeth of the first saw tooth portion and the saw teeth of the second saw tooth portion is 0.1 to 0.9 cycles.

[0014] The engraving device according to claim 5 of the present invention is characterized in that: the third serrated part is a single tooth or a double tooth.

[0015] The engraving device according to claim 6 of the present invention is characterized in that: a first force-applying means is provided between the third substrate and the fifth substrate, and a second force-applying means is provided between the fourth substrate and the fifth substrate.

[0016] The marking device according to claim 7 of the present invention is characterized in that: the indicator body is mounted on the upper side of the head by a connecting means.

[0017] In the engraving device according to claim 1 of the present invention, the outermost tooth of the double teeth constituting the third sawtooth portion engages with the first sawtooth portion. Therefore, when the first connecting rod rises, the second sawtooth portion engages with the innermost tooth of the double teeth constituting the third sawtooth portion. This reliably transmits the motion of the drive unit to the first and second drive / driven units, allowing the index body to reliably rotate one scale mark in a single operation. When the series of operations is completed, the second substrate descends to its lowest point within the hollow cylinder. At this time, the third substrate also descends within the hollow cylinder, and the sawtooth of the first sawtooth portion engages with the outermost tooth of the double teeth constituting the third sawtooth portion. Since the second substrate cannot rotate within the hollow cylinder, the first and second sawtooth portions can return to their pre-operational positional relationship at the bottom of the hollow cylinder. The double teeth constituting the third sawtooth portion are fixed within the third substrate. Therefore, the serrations of the first serration engage with the outermost serration of the double teeth constituting the third serration, allowing the first, second, and third serrations to be reset to the correct positions. As a result, an engraving device with a simple structure, reliable reset capability, and the ability to accurately rotate the index body for one cycle is obtained.

[0018] In the engraving apparatus according to claim 2 of the present invention, the second connecting rod penetrates the cover portion and the fifth base. A cylindrically enlarged head provided on the second connecting rod is capable of moving up and down within the cylindrical portion and rotating within the cylindrical portion. Since the second connecting rod is protected inside the cylindrical portion, reliable movement and rotation of the second connecting rod can be ensured. Furthermore, because a seventh serrated portion engaging with the sixth serrated portion is provided on the lower side of the head, and an index body is provided on the upper side of the head, the index body can be reliably rotated one cycle in a single operation.

[0019] In the engraving apparatus according to claim 3 of the present invention, when the first connecting rod is not subjected to a force from below, the first serrated portion and the second serrated portion have serrations with the same period. Before operation begins, the serrations of the first serrated portion and the second serrated portion form a double tooth with an offset period. When the first connecting rod is not subjected to a force from below, the third serrated portion engages with the first serrated portion. Therefore, after one operation is completed, the first serrated portion and the third serrated portion can be returned to the fully engaged position. As a result, reliable operation is possible.

[0020] In the engraving device according to claim 4 of the present invention, as long as the periodic offset between the saw teeth of the first saw tooth portion and the saw teeth of the second saw tooth portion is 0.1 to 0.9 cycles, the first saw tooth portion and the third saw tooth portion can be reset to the fully engaged position.

[0021] In the engraving device according to claim 5 of the present invention, the third serrated portion can be a single tooth or a double tooth. If it is a single tooth, the structure is simple and can be manufactured at low cost; if it is a double tooth, the first serrated portion and the third serrated portion can mesh more reliably, thereby reliably achieving resetting.

[0022] In the engraving apparatus according to claim 6 of the present invention, a first force-applying means is provided between the third substrate and the fifth substrate, and a second force-applying means is provided between the fourth substrate and the fifth substrate. Therefore, when the sixth serrated portion and the seventh serrated portion engage, the third substrate moves downward and the fourth substrate moves upward, thereby resetting the engraving apparatus to the state before the start of operation.

[0023] In the engraving apparatus according to claim 7 of the present invention, the indicator body is mounted on the upper side of the head via a connecting means. Since the indicator body is mounted on the head of the second connecting rod via a connecting means, the indicator body can be replaced according to the intended use. Attached Figure Description

[0024] Figure 1 is a cross-sectional view of the engraving device of the present invention mounted on a mold substrate; Figure 2 is a perspective view of the engraving apparatus of the present invention; Figure 3 is a cross-sectional view of the marking device shown in Figure 2 along the AA' direction; Figure 4 is an exploded perspective view of the engraving device shown in Figure 2; Figure 5 is a schematic diagram illustrating the operation of the engraving device involved in this invention; Figure 6 is a schematic diagram illustrating another operation of the engraving apparatus involved in the present invention; Figure 7 is a schematic diagram illustrating another operation of the engraving apparatus involved in this invention; Figure 8 is a schematic diagram illustrating another operation of the engraving apparatus involved in the present invention; Figure 9 is a schematic diagram illustrating another operation of the engraving apparatus involved in the present invention; Figure 10 is a schematic diagram illustrating another operation of the engraving apparatus of the present invention. Detailed Implementation

[0025] Hereinafter, embodiments of the marking apparatus of the present invention will be described with reference to the accompanying drawings. Figure 1 This is a cross-sectional view of the engraving device of the present invention mounted on a mold substrate. Figure 2 This is a perspective view of the engraving apparatus involved in the present invention. Figure 3 yes Figure 2 The engraving device shown is a cross-sectional view along the A-A' direction. Figure 4 yes Figure 2An exploded perspective view of the engraving device shown.

[0026] The engraving device 2 of this invention is mounted on a mold substrate. For example... Figure 1 As shown, for example, the top surface of the engraving device 2 involved in this invention is flush with the cavity surface and is tightly embedded in the recess of the mold substrate 1. Furthermore, in Figure 2 The engraving device 2 shown is surrounded by a display panel 28 labeled with numbers, text, etc. In Figure 1, the mechanism connected to the lower part of the first connecting rod 9 extending from the bottom surface of the engraving device 2 is not shown. The engraving device 2 is driven by moving the first connecting rod 9 vertically. There are no particular limitations on the driving means that generate the vertical movement; high-pressure air from a compressed air source, an electric motor, or any known driving means can be used.

[0027] Implementation Method 1

[0028] As shown in Figures 3 and 4, the engraving device 2 of the present invention has a driving part A, a first driving and driven part B and a second driving and driven part C inside a hollow cylindrical body 3 with a first hole 4 in the center at the bottom.

[0029] (Drive Department) In this invention, the driving part A includes: a first base 5, which has a first serrated part 6 around the first hole 4 inside the hollow cylinder 3; a second base 7, which has a second serrated part 8 and is embedded inside the first base 5; and a first connecting rod 9, which is fixed to the second base 7 and extends through the first hole 4 to the lower part of the engraving device 2.

[0030] The function of the drive unit A is to use the external force applied to the first connecting rod 9 to drive the first drive / driven unit B to move upward and rotate around the axis.

[0031] The first base 5 is cylindrical and is fixed to the periphery of the first hole 4 inside the hollow cylinder 3. The outer surface of the first base 5 contacts the inner wall of the hollow cylinder 3, and the bottom surface contacts and is fixed to the upper surface of the bottom surface of the hollow cylinder 3. The first serrated part 6 is provided on the upper part of the first base 5.

[0032] The second base 7 is fixed to the first connecting rod 9 and moves up and down as the first connecting rod 9 moves in the vertical direction. The first connecting rod 9 is only allowed to move in the vertical direction. The second serrated portion 8 has serrations with the same period as the first serrated portion 6. With the second base 7 fully inserted into the first base 5, the first and second serrated portions are arranged in a staggered period. The staggered period can be appropriately selected, preferably in the range of 0.1 to 0.9 periods. The structure of the serrations is not particularly limited; it can be a single-edged structure or a double-edged structure. Figure 3In the example, the first serrated part 6 has a single-edged structure, and the second serrated part 8 has a double-edged structure.

[0033] The first connecting rod 9 is configured to be coaxial with the hollow cylinder 3.

[0034] (First drive, driven part) The first driven / driven unit B moves upward under the drive of the driving unit A. The third serrated part 15 provided at the lower part of the third base 10 of the first driven / driven unit B rotates coaxially through the rotation generated by the driving unit A. The first driven / driven unit B transmits its upward movement and rotation to the second driven / driven unit C to drive the second driven / driven unit C.

[0035] The first drive / driven part B includes a third base 10. The third base 10 is a disk shape coaxial with the hollow cylinder 3. The first drive / driven part B can move up and down and rotate within the hollow cylinder 3 while maintaining coaxiality with the hollow cylinder 3. The third base 10 is not connected to a connecting rod.

[0036] The third substrate 10 has a third serrated portion 15 on the side facing the second substrate 7, which engages with the first serrated portion 6 and the second serrated portion 8. The third serrated portion 15 is composed of two teeth, which engage with the serrations of the first serrated portion 6 and the second serrated portion 8, respectively. The teeth of the third serrated portion 15 that engage with the serrations of the first serrated portion 6 and the serrations that engage with the serrations of the second serrated portion 8 are configured such that the third serrated portion 15 does not simultaneously engage with both the first serrated portion 6 and the second serrated portion 8. By making the third serrated portion 15 a double tooth of this shape, it can reliably engage with the serrations of the first serrated portion 6 and the second serrated portion 8. Alternatively, the third serrated portion 15 can also be a single tooth.

[0037] The third substrate 10 has a fourth serrated portion 17 on the surface opposite to the surface where the third serrated portion 15 is provided.

[0038] (Second drive, driven part) The second drive / driven part C moves upward under the drive of the first drive / driven part B, and rotates coaxially through the rotation generated by the first drive / driven part B, causing the index body 14 to rotate.

[0039] The second drive / driven part C includes a fourth base 11, a fifth base 19, a cover 12, and a second connecting rod 13. The second connecting rod 13 is integrated with the fourth base 11. The fifth base 19 and the cover 12 have holes in the center for the second connecting rod 13 to pass through, but since they are fixed to the hollow cylinder 3, they will not move.

[0040] The fourth base 11 has a fifth serrated portion 20 on the side facing the third base 10, which can engage with the fourth serrated portion 17. A fifth base 19 is provided on the opposite side of the fourth base 11. The fifth base 19 has a sixth serrated portion 22 on the side opposite to the fourth base 11. When the first connecting rod 9 is not subjected to a force from below, the serrations of the fourth serrated portion 17 and the fifth serrated portion 20 are positioned in a non-interlocking position.

[0041] The cover 12 covers the entire upper part of the hollow cylindrical body 3. A cylindrical portion 18 protrudes from the center of the cover 12. The cover 12 supports the vertical movement of the second connecting rod 13 within the cylindrical portion 18. Furthermore, a sixth serrated portion 22 is located within the cylindrical portion 18.

[0042] The second connecting rod 13 coaxially fixes the fourth base 11 to the hollow cylinder 3. The second connecting rod 13 has a cylindrically enlarged head 21 inside the cylindrical portion 18. A seventh serrated portion 23, which meshes with the sixth serrated portion 22, is provided on the lower side of the head 21. The second connecting rod 13 can move vertically. Furthermore, the second connecting rod 13 and the fourth base 11 can rotate coaxially. The cylindrically enlarged head 21 of the second connecting rod 13 can move vertically within the cylindrical portion 18 of the cover portion 12.

[0043] The top of the head 21 is provided with an indicator body 14. The indicator body 14 is used to indicate specific text or numbers on the dial, specifically, it is marked with arrows or other symbols. Figure 3 As shown, the indicator body 14 can be integrated with the head 21 of the second connecting rod 13, or it can be as follows: Figure 4 As shown, it is mounted on the upper side of the head via a connecting means. The connecting means employs known methods such as screws.

[0044] In the engraving apparatus 2 of the present invention, a first force-applying means 24 is provided between the upper side of the third substrate 10 and the lower side of the fifth substrate 19, and a second force-applying means 25 is provided between the upper side of the fourth substrate 11 and the lower side of the fifth substrate 19. The force-applying means can be a known means, such as a spring.

[0045] action Hereinafter, the operation of the marking apparatus of the present invention will be described with reference to FIG5 to 10. In this series of operations, the case where the third serration is double-toothed will be used as an example, but the basic operation is the same even if it is a single tooth.

[0046] (Step 1) Figure 5 is a schematic diagram illustrating the state of the marking apparatus before use (step 1) of the present invention. In Figure 5, the serrations of the first serration section 6 are engaged with the serrations of the third serration section 15. The serrations of the second serration section 8 and the serrations 15' of the third serration section are not engaged, and are respectively arranged in a manner that is periodically staggered from the serrations of the first serration section 6. The fourth serration section 17 and the fifth serration section 20 are arranged in a manner that is periodically staggered from each other. The amount of staggering of these periods can be appropriately selected, preferably in the range of 0.1 to 0.9 periods. The sixth serration section 22 and the seventh serration section 23 are in an engaged state.

[0047] (Step 2) Figure 6 is a schematic diagram illustrating the state in which the drive unit A begins to drive and applies an upward force to the first connecting rod 9. In Figure 6, as the drive unit A moves upward, the serrations of the first serration 6 disengage from the serrations of the third serration 15. As the drive unit A moves upward, the serrations of the second serration 8 contact the serrations 15' of the third serration. When the drive unit A moves further upward, the serrations of the second serration 8 engage with the serrations 15' of the third serration, and through this engagement, the first drive / driven unit B rotates. Through this rotation, the third base 10 and the fourth serration 17 also rotate. Through this rotation, as shown in Figure 6, the fourth serration 17 moves to a position where its inclined portion 17' is opposite to the inclined portion 20' of the fifth serration 20.

[0048] When the third sawtooth portion 15 is a single tooth, the sawtooth of the third sawtooth portion 15 engages with the sawtooth of the first sawtooth portion 6 when the first connecting rod 9 is not subjected to a force from below. When a force from below is applied to the first connecting rod 9, the first sawtooth portion 6 and the second sawtooth portion 8 come into contact with the third sawtooth portion 15. When a further force from below is applied to the first connecting rod 9 to move it upward, the third sawtooth portion 15 rotates and engages with the second sawtooth portion 8. Through this engagement, the first drive / driven portion B rotates. Afterward, the operation of the first drive / driven portion B is the same as in the case of a double tooth.

[0049] (Step 3) Figure 7 is a schematic diagram illustrating the state in which a further upward force is applied to the drive unit A. As shown in Figure 7, when the second connecting rod 13 moves further upward, the inclined portion of the serration of the fourth serration 17 contacts the inclined portion of the serration of the fifth serration 20. At this time, the second connecting rod 13 begins to rise, and the tip of the serration of the sixth serration 22 contacts the tip of the serration of the seventh serration.

[0050] (Step 4) In the state shown in Figure 7, when the first connecting rod 9 of the drive unit A moves further upward, the first drive / driven unit B and the second drive / driven unit C continue to rise. At this time, the inclined portion of the saw teeth of the fourth saw tooth portion 17 rises in contact with the inclined portion of the saw teeth of the fifth saw tooth portion 20. When the first drive / driven unit B rises further, as shown in Figure 8, the saw teeth of the fifth saw tooth portion 20 slide off the inclined portion of the saw teeth of the fourth saw tooth portion 17. The fourth saw tooth portion 17 and the fifth saw tooth portion 20 have grooves 26 and 27 between their respective saw teeth. The saw teeth of the fourth saw tooth portion 17 and the saw teeth of the fifth saw tooth portion 20 mesh within the grooves 26 and 27. The number of saw teeth in the fourth saw tooth portion 17 and the fifth saw tooth portion 20 is half the number of saw teeth in the third saw tooth portion. On the other hand, the grooves 26 and 27 provided between the serrations of the fourth serration portion 17 and the fifth serration portion 20 are distributed on the surfaces of the third base 10 and the fifth base 11 in the same number and at equal intervals as the serrations of the fourth serration portion 17 and the fifth serration portion 20. Therefore, the second connecting rod 13 will rotate by engaging with the grooves 26 and 27, and the rotation angle is equivalent to half the cycle corresponding to the serration of the fifth serration portion 20 (that is, equivalent to the cycle corresponding to the serration of the third serration portion). Through these actions, the second connecting rod 13 rotates one cycle.

[0051] Through the operations described in steps 3 and 4 above, the seventh serrated section 23 rotates one cycle. This rotation enables the indicator body 14 to rotate one cycle. To enable the indicator body 14 to rotate one cycle, the number of serrations in the first serrated section 6, the second serrated section 8, the third serrated section 15, the sixth serrated section 22, and the seventh serrated section 23 should be twice the number of serrations in the fourth serrated section 17 and the fifth serrated section 20. For example, as shown in Figure 2, when the dial displays numbers 0 to 9, since only a 36° rotation is required per operation, the number of serrations in the first serrated section 6, the second serrated section 8, the third serrated section 15, the sixth serrated section 22, and the seventh serrated section 23 should be 10, and the number of serrations in the fourth serrated section 17 and the fifth serrated section 20 should be 5.

[0052] (Step 5) Figure 9 is a schematic diagram illustrating the state in which the force causing the drive unit A to move upward is released. When the force causing the first connecting rod 9 to move upward is released, the drive unit A moves downward. Since the force causing the first drive / driven unit B to move upward is also released, the first drive / driven unit B also moves downward. As a result, the fourth serrated part 17 and the fifth serrated part 20 disengage.

[0053] (Step 6) Figure 10 is a schematic diagram illustrating the state at the end of the operation. The first connecting rod 9 and the second base 7 are fully lowered to the bottom. The second base 7 is inserted into the inside of the first base 5. The serrations of the third serrated part 15 engage with the serrations of the first serrated part 6. As a result, the first drive / driven part B is reliably rotated and reset, and the operation ends.

[0054] To adjust the index body 14 to the desired position, repeat steps 1 to 6 above.

[0055] In this specification, the offset between saw teeth with the same period is 0.1 to 0.9 periods. An appropriate offset within this range can be selected.

[0056] In the engraving apparatus of the present invention, a first force-applying means 24 and a second force-applying means 25 are provided. The first force-applying means 24 is disposed between the third substrate 10 and the fifth substrate 19. The second force-applying means 25 is disposed between the fourth substrate 11 and the fifth substrate 19. During the operation shown in Figures 6 to 8, the first force-applying means 24 is in an extended state and the second force-applying means 25 is in a compressed state. When the upward force applied to the first connecting rod is released, the first force-applying means 24 and the second force-applying means 25 return to their original states, thereby rapidly separating the fifth serrated portion 20 from the fourth serrated portion 17.

[0057] Implementation Method 2 In the second embodiment, the driving unit and the first driving / driven unit are the same as in the first embodiment, but the second driving / driven unit is different. The differences will be explained below.

[0058] The second drive / driven part C in the second embodiment includes: a fourth base 11, which has a fifth serrated part 20 that engages with the fourth serrated part 17; and a second connecting rod 13, which is connected to the base 11 and has a cylindrically enlarged head 21. An index body 14 is provided on the upper side of the head 21.

[0059] The second embodiment is a simplified version of the first embodiment. In this embodiment, the fifth base 19, the cover 12, the sixth serrated portion 22, and the seventh serrated portion 23 are not present. An index body 14 is provided at the top of the head 21 of the second connecting rod 13.

[0060] As shown in Figure 4, the fourth sawtooth section 17 and the fifth sawtooth section 20 have grooves 26 and 27 between their respective sawtooths. This allows the index body 14 to rotate one cycle.

[0061] Steps 1 and 2 are the same as above.

[0062] (Step 3) As the first connecting rod 9 moves further upward, the drive unit A also moves upward. Since the serrations of the second serration unit 8 engage with the serrations of the third serration unit 15, the first drive / driven unit B also moves upward. When the first drive / driven unit B moves further upward, the inclined portion of the serrations of the fourth serration unit 17 contacts the inclined portion of the serrations of the fifth serration unit 20, thereby causing the second connecting rod 13 to move upward.

[0063] (Step 4) As the first connecting rod 9 of the drive unit A moves further upward, the first drive / driven unit B and the second drive / driven unit C continue to rise. At this time, the inclined portion of the serration of the fourth serration 17 and the inclined portion of the serration of the fifth serration 20 rise in contact. As the first drive / driven unit B rises further, the serration of the fifth serration 20 slides off the inclined portion of the serration of the fourth serration 17, and the serrations of the fourth serration 17 and the fifth serration 20 respectively fall into each other's grooves and engage. Through these actions, the second connecting rod 13 rotates one cycle, thereby causing the index body to rotate one cycle as well.

[0064] (Step 5) When the force causing the first connecting rod 9 to move upward is released, the drive unit A moves downward. Since the force causing the first drive / driven unit B to move upward is also released, the first drive / driven unit B also moves downward. As a result, the fourth serrated part 17 and the fifth serrated part 20 disengage.

[0065] (Step 6) The first connecting rod 9 and the second base 7 are fully lowered to the bottom. The second base 7 is inserted into the inside of the first base 5. The teeth of the third serrated part engage with the teeth of the first serrated part. As a result, the drive unit A is reliably reset, and the operation ends.

[0066] Industrial utilization potential The present invention relates to an engraving device used in injection molding machines to engrave manufacturing numbers or manufacturing dates on the surface of molded articles, which can reliably change the display of the indicator.

[0067] Symbol Explanation 1. Mold substrate 2 marking device 3 Hollow cylinder 4. First hole 5 First matrix 6 First serrated section 7 Second matrix 8 Second serrated section 9 First connecting rod 10 Third matrix 11. Fourth matrix 12 cover 13 Second connecting rod 14 Indicator Components 15 Third serration 17. Fourth serrated section 18. Cylindrical section 19 Fifth matrix 20 Fifth serrated section 21 Head 22 Sixth serration 23. Seventh serrated section 24 First means of applying force 25 Second means of applying force Grooves 26 and 27 28 Display Panel A Drive Unit B. First Drive - Driven Part C Second Drive - Driven Part

Claims

1. An engraving device, embedded in a recess of a molding die, characterized in that, The engraving device includes: A hollow cylindrical body with a first hole in the center of its bottom; The driving unit includes: a first base having a first serrated portion around the periphery of the first hole in the hollow cylinder; a second base having a second serrated portion embedded inside the first base; and a first connecting rod fixed to the second base and extending through the first hole to the lower part of the engraving device. The first driving / driven part includes a third base, on which a third sawtooth part is provided that meshes with the first sawtooth part and the second sawtooth part, and a fourth sawtooth part is provided on a surface opposite to the surface on which the third sawtooth part is provided. The second drive / driven part includes a fourth base and a second connecting rod. The fourth base is provided with a fifth serrated part that meshes with the fourth serrated part. The second connecting rod is connected to the fourth base and is provided with a cylindrical enlarged head. An indicator is provided on the upper side of the head.

2. The engraving apparatus according to claim 1, characterized in that, The second drive / driven part also includes: A cover portion, which is disposed on the upper part of the hollow cylinder and has a cylindrical portion that protrudes in a cylindrical shape in the center; The fifth base is located below the cover and is fixed to the hollow cylinder. A sixth serrated part is provided on its upper surface. The second connecting rod passes through the cover and the fifth base; The second connecting rod has a seventh sawtooth portion on the lower side of the head that meshes with the sixth sawtooth portion.

3. The engraving apparatus according to claim 1, characterized in that: The first serrated portion and the second serrated portion have serrations with the same period. When the second substrate is embedded in the first substrate, the serrations of the first serrated portion and the serrations of the second serrated portion are arranged in a staggered period, and the third serrated portion meshes with the first serrated portion.

4. The engraving apparatus according to claim 3, characterized in that: The periodic offset between the serrations of the first serration portion and the serrations of the second serration portion is 0.1 to 0.9 cycles.

5. The engraving apparatus according to claim 1, characterized in that: The third serrated section is a single tooth or a double tooth.

6. The engraving apparatus according to claim 1, characterized in that: A first force-applying means is provided between the third substrate and the fifth substrate, and a second force-applying means is provided between the fourth substrate and the fifth substrate.

7. The engraving apparatus according to claim 1, characterized in that: The indicator body is mounted on the upper side of the head via a connection means.

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