Engraving device

Abstract

This invention provides an engraving device that is simple in structure, reliably resets, and accurately rotates an indicator body for one cycle. The engraving device is embedded in a groove of a molding die, characterized in that: the engraving device comprises: a hollow cylindrical body with a first hole at its center; a driving unit comprising a first base, a second base, and a first connecting rod; the first base having a first serrated portion around the periphery of the first hole within the hollow cylindrical body; the second base having a second serrated portion embedded within the first base; and the first connecting rod fixing the second base and extending through the first hole out of the lower part of the engraving device. The first driving and driven part includes a third base, which has a third sawtooth portion that engages with the first sawtooth portion and the second sawtooth portion, and a fourth sawtooth portion is provided on the surface opposite to the surface on which the third sawtooth portion is provided; the second driving and driven part includes a fourth base and a second connecting rod, which has a fifth sawtooth portion that engages with the fourth sawtooth portion, and the second connecting rod has a cylindrical, enlarged head that connects to the fourth base; an index body is provided on the upper side of the head.

Description

[Technical Field]

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

[0002] In an injection molding machine, a movable mold base plate (movable type) is driven towards / away from a fixed mold base plate (fixed type) to close the mold (mold closing) and open the mold (mold opening). Molten synthetic resin is supplied to the cavity inside the closed mold, and the molten synthetic resin hardens to form a molded article.

[0003] In the case of mass production of products, it is necessary to engrave the manufacturing number and / or manufacturing date on the surface of the product, and therefore an engraving device is used. The manufacturing number and / or manufacturing date are obtained by inserting the engraving device equipped with the engraving mark into the cavity side of the molding die, and molding is performed in the inserted state, thereby directly engraving the engraving content onto the surface of the molded product.

[0004] A printing device has been proposed (for example, see Patent Document 1), which allows the operator to work at the injection molding machine without a strained posture, prevents the body from contacting the mold substrate and causing burns, can change the markings of the indicator, and has excellent heat resistance, durability, simple structure and low cost. The printing device described in Patent Document 1 includes: an outer shell with circumferentially shaped text or marks engraved on the upper end face of a hollow cylindrical body, an upper drive and 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.

[0005] Patent Document 1 discloses an engraving device that uses air pressure generated within a lower drive mechanism to drive a connecting rod, and utilizes the engagement of serrated portions within an upper drive and driven mechanism, as well as the engagement of the serrated portions with protrusions on a rotator, to rotate a marking portion. This engraving device comprises an outer shell with circumferentially shaped characters or marks engraved on its upper end face of a hollow cylindrical body, an upper drive and 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 and driven mechanism consists of an outer cylinder fixed inside the outer shell and having an engagement portion at its upper end, an inner cylinder fitted inside the outer cylinder and having an engagement portion formed at its upper end, and a solid or hollow cylinder fitted inside the outer shell. The rotor and the means of attaching the rotor downwards are constituted; the inner cylinder is connected to the piston by a connecting rod; the rotor and the outer cylinder are engaged in a first state and disengaged in a second state; the rotor and the inner cylinder are disengaged in a first state and engaged in a second state; the lower drive mechanism is constituted by a cylinder that introduces compressed air through a ventilation path connected to a compressed air source and a piston that is embedded in the cylinder and driven by the compressed air; the cylinder is constituted by being fitted into the outer shell.

[0006] This marking device utilizes the engagement and disengagement of the rotor and the serrated portion of the outer cylinder, as well as the engagement and disengagement of the rotor and the serrated portion of the inner cylinder (different in phase from the serrated portion of the outer cylinder), to move the protrusion of the rotor by a protruding component and rotate the index body by a component of one cycle. A longitudinal slit is provided on the inner surface of the outer cylinder. On the other hand, ribs are provided on the outer surface of the inner cylinder.

[0007] However, in the engraving apparatus of Patent Document 1, the protrusion located at the lower part of the rotor engages with the serrations of the second serrated portion of the inner cylinder to rotate the rotor. In the reset state, the protrusion engages with the outer cylinder. Therefore, the movement of the inner cylinder only in the vertical direction sometimes prevents the serrated portion of the inner cylinder from resetting to the correct position. Consequently, there is a problem that the index body may not rotate correctly for one cycle. [Prior Art Documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent No. 7239195. [Summary of the Invention]

[0009] [Problem to be solved by the invention] In order to solve the above-mentioned problem, the inventors have actively researched and provided an engraving device with a simple structure, capable of reliably resetting and the index body can correctly rotate one cycle of the component.

[0010] [Means for Solving the Problem] The engraving device of Solution 1 of the present invention is: an engraving device that is embedded in the groove of a molding die, characterized in that: the engraving device comprises: a hollow cylindrical body having a first hole in the center of its lower part; a driving unit comprising a first base, a second base, and a first connecting rod, wherein the first base is provided with a first serrated portion around the periphery of the first hole in the hollow cylindrical body, the second base is provided with a second serrated portion embedded inside the first base, and the first connecting rod is fixed to the second base and extends out through the first hole. The lower part of the printing device includes: a first driving and driven part comprising a third base, wherein the third base is provided with a third serrated portion that engages with the first serrated portion and the second serrated portion, and a fourth serrated portion is provided on the surface opposite to the surface on which the third serrated portion is provided; and a second driving and driven part comprising a fourth base and a second connecting rod, wherein the fourth base is provided with a fifth serrated portion that engages with the fourth serrated portion, and the second connecting rod is provided with a cylindrical, enlarged head that connects to the fourth base; and an index body is provided on the upper side of the head.

[0011] The marking device of embodiment 2 of the present invention is characterized in that: the aforementioned second driving and driven part further comprises: a cover and a fifth base; the aforementioned cover comprises a cylindrical part disposed on the upper part of the aforementioned hollow cylindrical body and protruding into a cylindrical shape in the center; the aforementioned fifth base is fixed to the aforementioned hollow cylindrical body at the lower part of the aforementioned cover and is provided with a sixth serrated part on the upper part; the aforementioned cover and the aforementioned fifth base are penetrated by the aforementioned second connecting rod; the aforementioned second connecting rod is provided with a seventh serrated part on the lower side of the aforementioned head that engages with the aforementioned sixth serrated part.

[0012] The marking device of embodiment 3 of the present invention is characterized in that: the aforementioned first sawtooth portion and the aforementioned second sawtooth portion have sawtooths of the same period; when the aforementioned second substrate is inserted into the aforementioned first substrate, the sawtooths of the aforementioned first sawtooth portion and the sawtooths of the aforementioned second sawtooth portion are arranged in a staggered period; the aforementioned third sawtooth portion engages with the aforementioned first sawtooth portion.

[0013] The marking device of embodiment 4 of the present invention is characterized in that: the deviation of the aforementioned period of the saw teeth of the first saw tooth portion and the saw teeth of the second saw tooth portion is 0.1 period to 0.9 period.

[0014] The marking device of embodiment 5 of the present invention is characterized in that: the aforementioned third sawtooth portion is a single tooth or a double tooth.

[0015] The imprinting apparatus of embodiment 6 of the present invention is characterized in that: a first potential means is provided between the aforementioned third substrate and the aforementioned fifth substrate; and a second potential means is provided between the aforementioned fourth substrate and the aforementioned fifth substrate.

[0016] The marking device of embodiment 7 of the present invention is characterized in that: the aforementioned index system is installed on the upper side of the aforementioned head using a connecting means.

[0017] [Effects of the Invention] In the engraving device of Embodiment 1 of the present invention, the first sawtooth part engages with the outer sawtooth of the double teeth constituting the third sawtooth part. Therefore, when the first connecting rod is raised, the second sawtooth part engages with the inner sawtooth of the double teeth constituting the third sawtooth part. Therefore, the movement of the first drive part can be reliably transmitted to the first drive and driven part and the second drive and driven part, so that the index body can be reliably rotated by one scale in one operation. At the end of the continuous operation, the second base body descends to the bottom in the hollow cylinder. At this time, the third base body also descends in the hollow cylinder, and the sawtooth of the first sawtooth part engages with the outer sawtooth of the double teeth constituting the third sawtooth part. Since the second base body cannot rotate in the hollow cylinder, the first sawtooth part and the second sawtooth part can be reset to their positional relationship before the start of the operation at the bottom of the hollow cylinder. The double teeth constituting the third serrated portion are fixed within the third base. Therefore, the serrations of the first serrated portion engage with the outermost serration of the double teeth constituting the third serrated portion, allowing the first, second, and third serrated portions to be reset to their correct positions. This results in an engraving device with a simple structure that reliably resets and correctly rotates the index body for one cycle.

[0018] In the engraving apparatus of embodiment 2 of the present invention, the aforementioned second connecting rod penetrates the aforementioned cover portion and the aforementioned fifth base. The cylindrical, enlarged head disposed on the aforementioned second connecting rod is capable of moving vertically within the aforementioned cylindrical portion and can rotate within the aforementioned cylindrical portion. Since the aforementioned second connecting rod is protected inside the aforementioned cylindrical portion, the movement or rotation of the aforementioned second connecting rod can be reliably performed. Furthermore, since a seventh serrated portion that engages with the aforementioned sixth serrated portion is provided on the lower side of the aforementioned head and an index body is provided on the upper side of the aforementioned head, the index body can be reliably rotated by one cycle in a single operation.

[0019] In the engraving apparatus of embodiment 3 of the present invention, when no force is applied from below to the first connecting rod, both 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 are configured as double teeth with staggered periods. The third serrated portion engages with the first serrated portion when no force is applied from below to the first connecting rod. Therefore, when an operation ends, the first serrated portion and the third serrated portion can be reset to the fully engaged position. As a result, operation can be reliably performed.

[0020] In the engraving device of embodiment 4 of the present invention, as long as the deviation of the aforementioned period of the saw teeth of the first saw tooth portion and the saw teeth of the second saw tooth portion is 0.1 period to 0.9 period, the first saw tooth portion and the third saw tooth portion can be reset to the fully engaged position.

[0021] In the engraving apparatus of embodiment 5 of the present invention, the aforementioned third serrated portion may be a single tooth or a double tooth. If it is a single tooth, the structure is simple and can be manufactured inexpensively. If it is a double tooth, since the aforementioned first serrated portion and the aforementioned third serrated portion can be engaged more reliably, resetting can be reliably performed.

[0022] In the engraving apparatus of embodiment 6 of the present invention, a first engagement means is provided between the aforementioned third substrate and the aforementioned fifth substrate, and a second engagement means is provided between the aforementioned fourth substrate and the aforementioned fifth substrate. Therefore, when the aforementioned sixth serrated portion and the aforementioned seventh serrated portion are engaged, the third substrate moves downward and the fourth substrate moves upward, which can return the engraving apparatus to the state before the start of operation.

[0023] In the marking apparatus of embodiment 7 of the present invention, the aforementioned indicator system is mounted on the upper side of the aforementioned head using a connecting means. Since the indicator body is mounted on the head of the second connecting rod using a connecting means, the indicator body can be replaced according to the purpose of use.

Implementation Method

[0025] Hereinafter, embodiments of the engraving apparatus of the present invention will be described with reference to the figures. FIG1 is a cross-sectional view of the engraving apparatus of the present invention mounted on a mold substrate. FIG2 is a perspective view of the engraving apparatus of the present invention; FIG3 is a cross-sectional view of the engraving apparatus of FIG2 along the A-A' direction. FIG4 is an exploded perspective view of the engraving apparatus of FIG2.

[0026] The engraving device 2 of the present invention is used after being installed on a mold substrate. As shown in FIG1, for example, the top of the engraving device 2 of the present invention is close to the groove of the mold substrate 1 so as to be flush with the surface of the cavity. In addition, an indication board 28 is installed around the top of the engraving device 2 in FIG2, which is attached with numbers, text, etc. In FIG1, the mechanism connecting 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) in the vertical direction. There are no particular limitations on the driving means for causing the vertical movement. High-pressure air from a compressed air source or the like can be used to move it vertically, an electric motor or the like can be used to move it vertically, or a known driving means can be used.

[0027] [First Embodiment] [Composition] 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 in a hollow cylindrical body 3. The hollow cylindrical body 3 has a first hole 4 in the center at the bottom.

[0028] [Drive Unit] In this invention, the drive unit A has the following components around the first hole 4 inside the hollow cylindrical body 3: a first base 5, which is provided with a first serrated portion 6; a second base 7, which is provided with a second serrated portion 8 and is embedded in the inner side of the first base 5; and a first connecting rod 9, which fixes the second base 7 and extends out from the lower part of the engraving device 2 through the first hole 4.

[0029] The drive unit A performs the following functions: using a force applied from the outside to the first connecting rod 9 in the upward direction of the device, it drives the first drive and driven unit B to move upward and rotate in the axial direction.

[0030] The first base 5 is cylindrical and is fixed to the periphery of the first hole 4 inside the hollow cylindrical body 3. The outer side surface of the first base 5 is in contact with the inner surface of the hollow cylindrical body 3, and the bottom surface is in contact with and fixed to the top of the bottom surface of the hollow cylindrical body 3. The first serrated part 6 is provided on the upper part of the first base 5.

[0031] The second base 7 is fixed to the first connecting rod 9 and moves vertically as the first connecting rod 9 moves vertically. The first connecting rod 9 is only allowed to move vertically. The second serrated portion 8 has serrations arranged in the same period as the first serrated portion 6. When the second base 7 is fully inserted into the first base 5, the first and second serrations are arranged at different periods. The period deviation is appropriately selected, preferably in the range of 0.1 to 0.9 periods. There are no particular limitations on the construction of the serrations; they can be single-edged or double-edged. In the example of FIG3, the serrations of the first serrated portion 6 are single-edged; the serrations of the second serrated portion 8 are double-edged.

[0032] The first connecting rod 9 is arranged to be coaxial with the hollow cylindrical body 3.

[0033] [First Drive and Driven Unit]

[0034] The first driving and driven unit B moves upward passively due to the drive of the driving unit A. The third serrated part 15, which is provided at the lower part of the third base 10 of the first driving and driven unit B, rotates coaxially due to the rotation generated by the drive of the driving unit A. The first driving and driven unit B transmits the upward movement or rotation of the first driving and driven unit B to the second driving and driven unit C, thereby driving the second driving and driven unit C.

[0035] The first drive and driven part B includes a third base 10. The third base 10 is formed into a disk shape that is coaxial with the hollow cylindrical body 3. The first drive and driven part B can move up and down and rotate directly within the hollow cylindrical body 3, coaxial with it. The third base 10 is not connected to the connecting rod.

[0036] The third substrate 10 is provided on the side of the second substrate 7 with a third serrated portion 15 that engages with the first serrated portion 6 and the second serrated portion 8. The third serrated portion 15 is composed of two teeth: a serrated tooth that engages with the serrated tooth of the first serrated portion 6 and a serrated tooth that engages with the serrated tooth of the second serrated portion 8. Among the serrated teeth of the third serrated portion 15, the serrated tooth that engages with the serrated tooth of the first serrated portion 6 and the serrated tooth that engages with the serrated tooth of the second serrated portion 8 are arranged such that the third serrated portion 15 does not engage with the first serrated portion 6 and the second serrated portion 8 simultaneously. By making the third serrated portion 15 into a double tooth with such a shape, the serrated tooth of the first serrated portion 6 and the serrated tooth of the second serrated portion 8 can be reliably engaged. Alternatively, the third serrated portion 15 may be a single tooth.

[0037] A fourth serrated portion 17 is provided on the surface of the third substrate 10 opposite to the surface on which the third serrated portion 15 is provided.

[0038] [Second Drive and Driven Part] The second drive and driven part C moves upward passively by the drive of the first drive and driven part B; it rotates coaxially by the rotation generated by the drive of the first drive and driven part B, thereby causing the index body 14 to rotate.

[0039] The second drive and 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 integrally formed with the fourth base 11. Although the fifth base 19 and the cover 12 have holes in the center and are penetrated by the second connecting rod 13, they do not move because they are fixed to the hollow cylindrical body 3.

[0040] On the fourth base 11, a fifth serrated portion 20 is provided on the side facing the third base 10, which engages with the fourth serrated portion 17. A fifth base 19 is provided on the surface opposite to the fourth base 11. A sixth serrated portion 22 is provided on the surface of the fifth base 19 opposite to the fourth base 11. When no force is applied to the first connecting rod 9 from below, the serrations of the fourth serrated portion 17 and the serrations of the fifth serrated portion 20 are arranged in a position where their opposing surfaces do not engage.

[0041] The cover portion 12 is configured to cover the entire upper part of the hollow cylindrical body 3. A cylindrical protruding cylindrical portion 18 is provided in the center of the cover portion 12. The cover portion 12 supports the vertical movement of the second connecting rod 13 within the cylindrical portion 18. Furthermore, a sixth serrated portion 22 is present within the cylindrical portion 18.

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

[0043] An indicator body 14 is provided at the front end of the head 21. The indicator body 14 indicates specific text and / or numbers on a textpad that displays text and / or numbers. Specifically, it may include arrows, etc. The indicator body 14 may be integrally formed with the head 21 of the second connecting rod 13 as shown in FIG3, or it may be mounted on the upper side of the head 21 using a connecting means as shown in FIG4. The connecting means may be a known connecting means such as screws.

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

[0045] [Operation] Hereinafter, the operation of the engraving apparatus of the present invention will be described using Figures 5 to 10. Although this series of operations is described using the third serrated section composed of double teeth as an example, the basic operation of a single tooth remains unchanged. [Step 1] Figure 5 is a conceptual diagram illustrating the state of the engraving apparatus of the present invention before use (Step 1). In Figure 5, the serrations of the first serrated section 6 engage with the serrations of the third serrated section 15. The serrations of the second serrated section 8 do not engage with the serrations of the third serrated section 15'. The serrations of the second serrated section 8 and the third serrated section 15' are respectively staggered from the serrations of the first serrated section 6 without engaging. The fourth serrated section 17 and the fifth serrated section 20 are staggered from each other in periodic arrangement. The deviation of these periods can be appropriately selected, preferably in the range of 0.1 to 0.9 periods. The sixth serrated section 22 and the seventh serrated section 23 are engaged.

[0046] [Step 2] Figure 6 is a conceptual diagram illustrating the state in which the drive unit A begins to drive and begins to apply a force to move the first connecting rod 9 upward. In Figure 6, by moving the drive unit A upward, the engagement between the serrations of the first serration 6 and the serrations of the third serration 15 is released. As the drive unit A moves upward, the serrations of the second serration 8 and the third serration 15' come into contact. When the drive unit A moves further upward, the serrations of the second serration 8 and the third serration 15' engage. By this engagement, the first drive and driven unit B rotates. By this rotation, the third base 10 and the fourth serration 17 also rotate. By this rotation, as shown in Figure 6, the fourth serration 17 moves to a position opposite to the inclined portion 17' of the fourth serration 17 and the inclined portion 20' of the fifth serration 20.

[0047] When the third serrated portion 15 is a single tooth, and no force is applied to the first connecting rod 9 from below, the serrations of the third serrated portion 15 engage with the serrations of the first serrated portion 6. When force is initially applied to the first connecting rod 9 from below, the first serrated portion 6 and the second serrated portion 8 come into contact with the third serrated portion 15. When force is further applied to the first connecting rod 9 from below and it moves upward, the third serrated portion 15 rotates and engages with the second serrated portion 8. This engagement causes the first driving and driven portion B to rotate. The subsequent motion of the first driving and driven portion B is the same as in the case of a double tooth.

[0048] [Step 3] Figure 7 is a conceptual diagram illustrating the state in which a force is applied to move the drive unit A further upward. As shown in Figure 7, when the second connecting rod 13 is moved further upward, the oblique portion of the serration of the fourth serration 17 contacts the oblique portion of the serration of the fifth serration 20. At this time, the second connecting rod 13 begins to rise, and the front end of the serration of the sixth serration 22 contacts the front end of the serration of the seventh serration.

[0049] [Step 4] In the state shown in FIG. 7, when the first connecting rod 9 of the drive unit A is moved further upward, the first drive and driven unit B and the second drive and driven unit C also continue to rise. At this time, the rise occurs with the inclined portion of the serration of the fourth serration 17 in contact with the inclined portion of the serration of the fifth serration 20. When the first drive and driven unit B is raised further, as shown in FIG. 8, the serration of the fifth serration 20 slides off the inclined portion of the serration of the fourth serration 17. The fourth serration 17 and the fifth serration 20 are respectively provided with grooves 26 and 27 between the serrations. The serrations of the fourth serration 17 and the serrations of the fifth serration 20 engage in the grooves 26 and 27. The number of serrations in the fourth serration 17 and the number of serrations in the fifth serration 20 is half the number of serrations in the third serration. On the other hand, the grooves 26 and 27 provided between the serrations of the fourth serration 17 and the fifth serration 20 are the same number of serrations in the fourth serration 17 as the number of serrations in the fifth serration 20, and exist at equal intervals on the surfaces of the third base 10 and the fifth base 11. Therefore, through the meshing action of the grooves 26 and 27, the second connecting rod 13 rotates by half the number of serrations in the fifth serration 20 (that is, a component of the number of serrations in the third serration). Through these actions, the second connecting rod 13 rotates by one cycle.

[0050] Through the operations of steps 3 and 4 above, the seventh serration 23 rotates by one cycle. This rotation allows the indicator body 14 to rotate by one cycle. Thus, to make the indicator body 14 rotate by one cycle, the number of serrations in the first serration 6, second serration 8, third serration 15, sixth serration 22, and seventh serration 23 only needs to be twice the number of serrations in the fourth serration 17 and fifth serration 20. For example, as shown in Figure 2, when the number 0 to 9 is marked on the dial, since a 36° rotation is required in one operation, the number of serrations in the first serration 6, second serration 8, third serration 15, sixth serration 22, and seventh serration 23 only needs to be 10, and the number of serrations in the fourth serration 17 and fifth serration 20 only needs to be 5.

[0051] [Step 5] Figure 9 is a conceptual 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 upward movement is released, the first drive and driven unit B also moves downward. Therefore, the engagement between the fourth serrated part 17 and the fifth serrated part 20 is released.

[0052] [Step 6] Figure 10 is a conceptual diagram illustrating the state at the end of the operation. The first connecting rod 9 and the second base 7 have completely descended 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. Therefore, the first drive and driven part B has reliably rotated and reset, thus ending the operation.

[0053] In order to place the index body 14 in the desired position, repeat steps 1 to 6 above.

[0054] Furthermore, in this specification, the deviation of the saw teeth with the same period between the saw teeth only needs to be a component of 0.1 period to 0.9 period. It is sufficient to select an appropriate period deviation within this range.

[0055] In the engraving apparatus of the present invention, a first engagement means 24 and a second engagement means 25 are provided. The first engagement means 24 is disposed between the third substrate 10 and the fifth substrate 19. The second engagement means 25 is disposed between the fourth substrate 11 and the fifth substrate 19. During the operation of Figures 6 to 8, the first engagement means 24 is in an extended state, and the second engagement means 25 is in a compressed state. When the force applied above the first connecting rod is released, since the first engagement means 24 and the second engagement means 25 return to their original states, the fifth serrated portion 20 and the fourth serrated portion 17 are rapidly separated.

[0056] [Second Embodiment] In the second embodiment, although the driving part and the first driving and driven part are the same as in the first embodiment, the second driving and driven part is different. Hereinafter, only the differences will be explained.

[0057] The second driving and driven part C in the second embodiment includes: a fourth base 11, which is provided with a fifth serrated part 20 that engages with the fourth serrated part 17; and a second connecting rod 13, which is provided with a cylindrical enlarged head 21 that is connected to the base 11; and an index body 14 is provided on the upper side of the head 21.

[0058] The second embodiment is a simplified version of the first embodiment. In this embodiment, the fifth base 19, the cover 12, the sixth serrated part 22, and the seventh serrated part 23 are not present. An index body 14 is provided at the front end of the head 21 of the second connecting rod 13.

[0059] As shown in Figure 4, the fourth sawtooth portion 17 and the fifth sawtooth portion 20 are respectively provided with grooves 26 and 27 between the sawtooths. Therefore, the index body 14 can rotate by one cycle.

[0060] [Step 1] and [Step 2] are as described above.

[0061] [Step 3'] As the first connecting rod 9 moves further upward, the driving part A also moves upward. Since the serrations of the second serration part 8 engage with the serrations of the third serration part 15, the first driving and driven part B also moves upward. When the first driving and driven part B moves further upward, the oblique portion of the serration of the fourth serration part 17 contacts the oblique portion of the serration of the fifth serration part 20. Therefore, the second connecting rod 13 moves upward.

[0062] [Step 4'] When the first connecting rod 9 of the drive unit A moves further upward, the first drive and driven unit B and the second drive and driven unit C also 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. When the first drive and 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 other grooves and engage. Through these actions, the second connecting rod 13 rotates by one cycle. As a result, the index body also rotates by one cycle.

[0063] [Step 5'] When the force that moves the first connecting rod 9 upward is released, the drive unit A moves downward. Since the force that moves the first drive and driven unit B upward is also released, it moves downward. Therefore, the engagement between the fourth serrated part 17 and the fifth serrated part 20 is released.

[0064] [Step 6'] The first connecting rod 9 and the second base 7 are completely lowered to the bottom. The second base 7 is inserted into the inside of the first base 5. The serrations of the third serration part engage with the serrations of the first serration part. Therefore, the drive unit A is reliably reset and the operation ends.

[0065] [Industrial Applicability] The present invention relates to an engraving device used in an injection molding machine to engrave a manufacturing number and / or manufacturing date on the surface of a molded article, which can reliably change the markings of the index body. [Simplified Explanation of the Diagram]

[0024] [Fig. 1] is a cross-sectional view showing the engraving apparatus of the present invention mounted on a mold substrate. [Fig. 2] is a perspective view of the engraving apparatus of the present invention. [Fig. 3] is a cross-sectional view of the engraving apparatus of Fig. 2 along the A-A' direction. [Fig. 4] is an exploded perspective view of the engraving apparatus of Fig. 2. [Fig. 5] is a conceptual diagram illustrating the operation of the engraving apparatus of the present invention. [Fig. 6] is a conceptual diagram illustrating another operation of the engraving apparatus of the present invention. [Fig. 7] is a conceptual diagram illustrating another operation of the engraving apparatus of the present invention. [Fig. 8] is a conceptual diagram illustrating another operation of the engraving apparatus of the present invention. [Fig. 9] is a conceptual diagram illustrating another operation of the engraving apparatus of the present invention. [Fig. 10] is a conceptual diagram illustrating another operation of the engraving apparatus of the present invention.

Claims

1. An engraving device, which is embedded in a groove of a molding die, characterized in that: the engraving device comprises: a hollow cylindrical body having a first hole at its center; a driving unit comprising a first base, a second base, and a first connecting rod, wherein the first base is provided with a first serrated portion around the periphery of the first hole in the hollow cylindrical body, the second base is provided with a second serrated portion embedded inside the first base, and the first connecting rod is fixed to the second base and extends out of the lower part of the engraving device through the first hole; The first drive and driven part includes a third base, which has a third sawtooth portion that engages with the first sawtooth portion and the second sawtooth portion, and a fourth sawtooth portion is provided on the surface opposite to the surface on which the third sawtooth portion is provided; and the second drive and driven part includes a fourth base and a second connecting rod, which has a fifth sawtooth portion that engages with the fourth sawtooth portion, and the second connecting rod has a cylindrical, enlarged head that connects to the fourth base; and an index body is provided on the upper side of the head.

2. The engraving apparatus as described in claim 1, wherein the aforementioned second drive and driven part further comprises a cover and a fifth base; the aforementioned cover comprises a cylindrical portion disposed on the upper part of the aforementioned hollow cylindrical body and protruding into a cylindrical shape at the center, the aforementioned fifth base is fixed to the aforementioned hollow cylindrical body at the lower part of the aforementioned cover and is provided with a sixth serrated portion on the upper part; the aforementioned cover and the aforementioned fifth base are penetrated by the aforementioned second connecting rod; the aforementioned second connecting rod is provided with a seventh serrated portion on the lower side of the aforementioned head that engages with the aforementioned sixth serrated portion.

3. The engraving apparatus as described in claim 1, wherein the first serrated portion and the second serrated portion have serrations of the same period; when the second substrate is inserted into the first substrate, the serrations of the first serrated portion and the serrations of the second serrated portion are arranged with a staggered period; and the third serrated portion engages with the first serrated portion.

4. The engraving apparatus as described in claim 3, wherein the deviation of the aforementioned period between the saw teeth of the first saw tooth portion and the saw teeth of the second saw tooth portion is 0.1 period to 0.9 period.

5. The engraving device as described in claim 1, wherein the aforementioned third serration is a single tooth or a double tooth.

6. The engraving apparatus as described in claim 1, wherein a first potential means is provided between the aforementioned third substrate and the fifth substrate; and a second potential means is provided between the aforementioned fourth substrate and the aforementioned fifth substrate.

7. The engraving device as described in claim 1, wherein the aforementioned indicator system is mounted on the upper side of the aforementioned head using a connecting means.

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