JP2009202210A - Dust-preventive cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust-preventive cap mounted to the upper pestle of a rotary press, in which the elastic deformation of a horizontal annular flange is suppressed, and a risk in which the horizontal annular flange comes off from the fitting groove of the upper pestle is eliminated. <P>SOLUTION: The dust preventive cap 1 is made of a resin in which a bellows part 11 expanding/contracting along the extending direction of the upper pestle 2 and a mounting part 12 engaged with the fitting groove 21 of the upper pestle 2 are integrally molded, wherein the mounting part 12 is composed of a bottom face 121 with the mountain-like bent periphery 113 at the lowest step of the bellows part 11 as the outer circumference, the horizontal annular flange 122 formed so as to be opened at the bottom face 121, and a vertical annular flange 123 formed so as to surround the horizontal annular flange 122, the horizontal annular flange 122 is fitted into the fitting groove 21 of the upper pestle 2, and the vertical annular flange 123 is made to follow the body part 22 of the upper pestle 2 continuous with the fitting groove 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a dustproof cap that is mounted on the upper collar of a rotary press (also called a rotary powder compression molding machine or a tableting machine) that compresses tablets.

  The dust-proof cap of the present invention can also be attached to the lower eyelid. However, since the dust cap is usually attached only to the upper lid and for convenience of description for specifying the vertical positional relationship of each part, only the dust cap attached to the upper lid will be described unless otherwise specified.

  The upper edge of the rotary press that compresses tablets and the like prevents the powder from entering the gap between the upper hole rotor and the guide hole of the upper edge rotor that supports the main body, and the lubricating oil filled in the gap In order to prevent it from dripping down, a dustproof cap having an elastic bellows part is often attached. The dustproof cap generally seen is composed of a bellows portion that expands and contracts along the main body portion of the upper collar, and a mounting portion that engages with a mounting groove provided at the boundary between the main body portion and the punch portion of the upper collar. In the conventional dustproof cap, a configuration in which only the bellows portion is made of resin or rubber and the mounting portion is made of metal has been seen, but the current dustproof cap is as shown in Patent Document 1 or Patent Document 2, as shown in Patent Document 1 or Patent Document 2. A resin-made structure in which the mounting portion and the mounting portion are integrally molded is the mainstream.

  Patent Document 1 discloses a dustproof cap in which one or two or more adsorption preventing convex portions are provided on the bottom surface (lower end surface) constituting the mounting portion of the resin dustproof cap in which the bellows portion and the mounting portion are integrally formed. ing. Accordingly, it is possible to prevent the bottom surface, which is the lowest step surface of the bellows portion, from being adsorbed on the upper surface of the mortar rotor that holds the mortar. The mounting portion includes a bottom surface and an opening that is opened in the bottom surface. The horizontal annular flange is configured as a part of a bottom surface having the opening as an inner periphery. Specifically, the dust-proof cap is formed with a flange-like flange on the outer peripheral side (upper peripheral edge of the upper end opening) of the upper edge of the bellows portion, and is closely attached to the upper flange rotor (upper rod support disk) from below, The upper arm is completely covered except for the punch.

  Patent Document 2 discloses a horizontal dust flange (ring-shaped ring) that engages with a mounting groove provided at a boundary between a main body portion and a punch portion of an upper collar for a resin dustproof cap in which a bellows portion and a mounting portion are integrally formed. A dustproof cap is disclosed in which a mounting portion (engaging portion) is configured by a plywood portion) and a bottom surface (engaging bottom portion) positioned below the horizontal annular flange, and the mounting portion is relatively thicker than the bellows portion. is doing. A preferable bottom surface structure has a substantially V-shaped cross section including a truncated cone tube, an annular plate, and an inverted truncated cone tube. Thereby, the elastic deformation ratio of the horizontal annular flange, which is thick, is reduced, the compressive force applied to the horizontal annular flange is reduced, and the mounting portion can be prevented from falling out of the mounting groove of the upper collar.

Japanese Patent Laid-Open No. 2001-105195 Registered Utility Model No. 3081782

  The installation state of the dust-proof cap with respect to the upper arm is stable if the elastic deformation of the horizontal annular flange of the mounting portion can be prevented. For example, expansion and contraction of the bellows portion without catching contributes to suppression of elastic deformation of the horizontal annular flange in that an unnecessary load is not applied to the horizontal annular flange. Since Patent Document 1 mainly focuses on preventing the bottom surface from adsorbing to the top surface of the mortar rotor, the expansion and contraction of the bellows portion is not particularly mentioned, but the rigidity of the bottom surface is reduced by forming a bowl-shaped flange. Increase and suppress elastic deformation of the horizontal annular flange. However, if only the horizontal annular flange is fitted to the upper groove mounting groove, the horizontal annular flange may be detached from the mounting groove even if the elastic deformation is suppressed.

  Patent document 2 is not particularly touched on the expansion and contraction of the bellows part as in patent document 1, but the mounting part is the bellows mainly focusing on the point of suppressing the elastic deformation of the horizontal annular flange fitted into the mounting groove of the upper collar. By making the thickness relatively with respect to the part, and in particular specifying the bottom surface in a substantially V-shaped cross section, the elastic deformation of the mounting part is suppressed, and the possibility that the horizontal annular flange comes off from the mounting groove is eliminated. However, as described above, if only the horizontal annular flange is fitted in the upper groove mounting groove, the horizontal annular flange may be detached from the mounting groove even if the elastic deformation is suppressed.

  In order to stabilize the mounting state of the dust cap on the upper rod, it is important to suppress the elastic deformation of the horizontal annular flange so that the horizontal annular flange is not dropped from the mounting groove of the upper rod. However, it is different if it is a metal mounting part that is a separate body from the bellows part, but in the case of a resin-integrated dust cap that is currently mainstream, the bottom surface of the mounting part also works as the bottom part of the bellows part, It is difficult to completely prevent elastic deformation of the horizontal annular flange continuous with the bottom surface. Therefore, the structure of the dustproof cap was studied so as to eliminate the possibility that the horizontal annular flange, which is elastically deformed to some extent, falls off the mounting groove of the upper collar while suppressing the elastic deformation of the horizontal annular flange.

  What has been developed as a result of the study is a dust-proof cap that is attached to the upper collar of the rotary press, and includes a bellows portion that expands and contracts along the extending direction of the upper collar, and a mounting portion that engages with the mounting groove of the upper collar. In the integrally formed resin dust cap, the mounting portion surrounds the bottom surface of the bellows portion with the bent peripheral edge at the bottom, the horizontal annular flange formed by opening the bottom surface, and the horizontal annular flange. A dust-proof cap that is formed of a vertical annular flange that is formed, the horizontal annular flange is fitted into the upper groove mounting groove, and the vertical annular flange is attached to the upper flange main body continuous with the mounting groove.

  The dustproof cap of the present invention is characterized in that a vertical annular flange is formed surrounding a horizontal annular flange. The vertical annular flange, together with the horizontal annular flange, constitutes a circular portion having an L-shaped cross section to increase the rigidity of the horizontal annular flange and suppress elastic deformation of the horizontal annular flange. In addition, when the horizontal annular flange is elastically deformed, the vertical annular flange engages with the main body of the upper collar before the horizontal annular flange is detached from the upper groove mounting groove, and the horizontal annular flange is not dropped from the mounting groove. Thus, the dust cap of the present invention can stabilize the mounting state on the upper eyelid.

  In order to reduce the load applied to the mounting portion, the bellows portion is a boundary with the inner annular rib on the inner peripheral side of the bent peripheral edge (hereinafter referred to as the valley peripheral edge) that becomes a valley when viewed from the outside, and the bottom surface of the mounting portion. A configuration in which outer annular ribs are respectively formed on the outer peripheral side of a bent peripheral edge (hereinafter referred to as a “folded peripheral edge”) that becomes a mountain when viewed from the outside is preferable. The folds of each step constituting the bellows part are folded independently within the range in which the inner annular ribs approach or separate from each other, and the folding of each fold affects each other to inhibit expansion and contraction of the bellows part. Eliminates the risk of Thereby, the load added to a mounting part by expansion / contraction of a bellows part can be made small. Furthermore, the outer annular rib applies a load caused by the expansion and contraction of the bellows part evenly in the circumferential direction, and suppresses the elastic deformation of the bottom surface constituting the attachment part, thereby preventing the elastic deformation of the horizontal annular flange. Suppress.

  In addition, the bottom surface of the mounting portion may be formed with a fitting recess on the side opposite to the vertical annular flange, and the end surface of the upper punch portion sandwiching the attachment groove may be fitted into the fitting recess. The fitting recess has a function of specifying the mounting position of the dust-proof cap with respect to the upper collar, forms a boundary that defines the bottom surface of the mounting portion and the horizontal annular flange, and the bottom surface on the outer peripheral side of the boundary has a bellows portion. While allowing the necessary elastic deformation accompanying expansion and contraction, the horizontal annular flange on the inner peripheral side of the boundary is not affected by the elastic deformation of the bottom surface to prevent the horizontal annular flange from falling out of the mounting groove. It also has a function. Further, if the vertical annular flange is chamfered with the upper end edge inclined inward, it becomes easy to fit along the main body of the upper collar. In the dustproof cap of the present invention, the horizontal annular flange and the vertical annular flange approach each other, and elastic deformation is suppressed respectively. For this reason, by chamfering the upper edge of the vertical annular flange, the dust cap is easily attached to the upper eyelid.

  The dustproof cap of the present invention suppresses the elastic deformation of the bottom surface of the bellows part, particularly the horizontal annular flange, which is caused by the expansion and contraction of the bellows part, and eliminates the possibility that the horizontal annular flange of the mounting part comes off from the mounting groove of the upper collar. Stabilizes the wearing state of the upper arm. This is because the vertical annular flange is formed to improve the rigidity of the horizontal annular flange and prevent it from falling off the mounting groove, and the load applied from the bellows portion to the mounting portion is reduced by forming the inner annular rib and the outer annular rib. This is a synergistic effect by suppressing the elastic deformation of the bottom surface and the horizontal annular flange constituting the mounting portion. In addition, the fitting recess provided on the bottom surface of the mounting portion has the effect of enhancing the stability of the mounting state, and the chamfering of the upper or lower edge of the vertical annular flange exceeds the mounting groove of the upper collar. This has the effect of facilitating external fitting of the vertical annular flange to the main body. As described above, the present invention makes it easy to attach the upper eyelid to the dustproof cap while improving the state of attaching the upper eyelid to the dustproof cap, and provides a practical dustproof cap.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing an example of a dustproof cap 1 according to the present invention, FIG. 2 is a cross-sectional view of the dustproof cap 1 of this example, FIG. 3 is a plan view of the dustproof cap 1 of this example, and FIG. FIG. 5 is a bottom view of the dust cap 1, FIG. 5 is a cross-sectional view showing a state in which the upper collar 2 fitted with the dustproof cap 1 of this example is lowered, and FIG. 6 is an upper collar 2 fitted with the dustproof cap 1 of this example. It is sectional drawing showing the state which rose. For convenience of explanation, the cross-sectional view shown in FIG. 2 is a cross-sectional view of the front portion where the supply / discharge hole 116 can be seen from the front side as seen from the back side while the dust cap 1 of the present example is divided forward and backward. 5 and 6 are sectional views of the dustproof cap 1 of this example divided into right and left, and a left side portion where the cross section of the supply / discharge hole 116 can be seen on the left side as seen from the right direction.

  As shown in FIG. 1, the dustproof cap 1 of the present example is similar in appearance to a dustproof cap of the same type in the past, and has a bellows portion 11 that expands and contracts along the extending direction of the upper collar 2, and a mounting groove for the upper collar 2. This is a resin molded product (made of silicon rubber) in which a mounting portion 12 that engages with 21 (see FIG. 5) is integrally molded. The type of the resin material is not limited as long as it has oil resistance, chemical resistance, and dust resistance. As shown in FIGS. 2 to 4, the bellows portion 11 and the mounting portion 12 each have a feature based on the present invention. The feature is that the dustproof cap 1 of the present invention is similar to the conventional dustproof cap. It will not prevent you from using it. That is, the dust-proof cap 1 of the present invention has an advantage in that it has compatibility with conventional products of the same type, and has an advantage in that the bellows portion 11 can be securely expanded and contracted, and the practicality of removing the mounting portion 12 can be eliminated.

  The bellows portion 11 is formed with an inner annular rib 112 on the inner peripheral side of the valley-folded peripheral edge 111 and an outer annular rib 114 on the outer peripheral side of the lowermost mountain-folded peripheral edge 113 that is a boundary with the bottom surface 121 of the mounting portion 12. ing. The size or cross-sectional shape of the inner annular rib 112 and the outer annular rib 114 is free. However, the inner annular rib 112 is preferably a small one that does not hinder folding of the pleats 115, and the outer annular rib 114 is preferably large from the viewpoint of increasing the rigidity of the bottom surface 121. Further, the inner annular rib 112 and the outer annular rib 114 are preferably both circular in cross section in order to avoid uneven distribution of stress when a load is applied.

  The dust cap 1 of this example is provided with a supply / discharge hole 116 in the second pleat 115 from above, and for convenience of explanation, the side provided with the supply / discharge hole 116 is the front (the supply / discharge hole 116 is provided). The side is not necessarily in front.) However, if the supply / discharge hole 116 is not provided, the front, left side, right side, and back side all appear in the same appearance. For this reason, the left side surface, the right side surface, and the back surface are not shown. The air supply / discharge hole 116 exhausts air from the inside of the bellows portion 11 when the upper rod 2 is raised, so that the bellows portion 11 can be shortened smoothly. On the contrary, when the upper collar 2 is lowered, air is sucked into the bellows part 11 and the bellows part 11 is smoothly extended.

  The mounting portion 12 surrounds the bottom surface 121 having a mountain-folded peripheral edge 113 that is the lowest step of the bellows portion 11, the horizontal annular flange 122 formed by opening the bottom surface 121, and the horizontal annular flange 122. And a vertical annular flange 123 formed. The dust cap 1 is mounted on the upper collar 2 with the horizontal annular flange 122 of the mounting portion 12 fitted in the mounting groove 21 and the vertical annular flange 123 attached to the main body portion 22. The horizontal annular flange 122, together with the vertical annular flange 123, constitutes a circular portion having an L-shaped cross section, increases rigidity, and suppresses elastic deformation. Further, the vertical annular flange 123 engages with the main body portion 22 of the upper collar 2. The main body portion 22 of this example has a multi-stage structure from the mounting groove 21, and a vertical annular flange 123 is engaged with an intermediate diameter portion following the mounting groove 21. Thus, the combination of the horizontal annular flange 122 and the vertical annular flange 123 brings about an effect of stabilizing the mounting state of the dust-proof cap 1 on the upper collar 2.

  The dustproof cap 1 of this example has a fitting recess 124 formed on the side of the mounting portion 12 opposite to the vertical annular flange 123 on the bottom surface 121, and the end surface 231 of the punch portion 23 of the upper punch 2 sandwiching the mounting groove 21 is fitted into the fitting recess 12. 124 (see FIG. 5). The fitting recess 124 specifies the mounting position of the dust cap 1 with respect to the upper collar 2 and forms a boundary between the bottom surface 121 of the mounting portion 12 and the horizontal annular flange 122. That is, the bottom surface 121 is allowed the minimum necessary elastic deformation along with the expansion and contraction of the bellows portion 11, and the influence of the elastic deformation of the bottom surface 121 is not exerted on the horizontal annular flange 122 by the boundary.

  The horizontal annular flange 122 and the vertical annular flange 123 that constitute the L-shaped section of the cross section increase the rigidity of each other, and each suppresses the elastic deformation of the counterpart. From this, the dust cap 1 of this example is chamfered with the upper edge 125 inclined inward in order to make it easy to fit the vertical annular flange 123 in which elastic deformation is suppressed to the main body 22 of the upper collar 2. The chamfering of the top edge 125 is performed by sliding the top edge 125 of the vertical annular flange 123 against the body 22 of the vertical annular flange 123 by sliding the top edge 125 against the edge of the body 22 without being caught by the edge of the body 22. Smooth fitting is achieved.

  As shown in FIG. 5, the upper rod 2 to which the dust cap 1 is attached is held by inserting the main body portion 22 through the upper rod holding hole 31 of the upper rod rotor 3. The upper rod 2 moves up and down according to the cam track by engaging an engaging projection (not illustrated) at the upper end with a cam track of an upper rod cam guide (not shown) disposed on the upper surface side of the upper rod rotor 3. . The dust cap 1 has the upper edge of the bellows portion 11 in contact with the lower surface of the upper rod rotor 3, the horizontal annular flange 122 of the mounting portion 12 is fitted into the mounting groove 21 of the upper rod 2, and the fitting recess 124 is raised. It is placed on and fitted to the end surface 231 of the punch portion 23 of the heel 2, and the vertical annular flange 123 is attached to the main body portion 22 of the upper heel 2 and attached to the upper heel 2. In the state where the upper collar 2 is lowered, the bellows portion 11 is extended and no load is particularly applied to the bottom surface 121 of the mounting portion 12, and the mounting state is stabilized only by fitting the horizontal annular flange 122 into the mounting groove 21. .

  When the upper collar 2 rises, the position of the upper end edge of the bellows portion 11 abutted against the lower surface of the upper collar rotor 3 does not change, and the mounting portion 12 rises according to the upper collar 2, so that it can be seen in FIG. The bellows portion 11 is compressed and shortened. The compression of the bellows portion 11 is due to the folds 115 constituting the bellows portion 11 being folded. Specifically, the inner annular rib 112 formed on the inner peripheral side of each valley folding peripheral edge 111 has a relatively higher rigidity than the pleats 115 and is not twisted or deformed by the folding of the pleats 115. The close proximity of the annular ribs 112 folds each pleat 115 individually and reliably. This means that the bellows portion 11 can be folded without the upper and lower valley folds 111 being folded over. Thereby, the bellows part 11 can be expanded and contracted smoothly.

  The compressed bellows portion 11 tends to push down the mounting portion 12 by the restoring force of each elastically deformed pleat 115. However, the outer annular rib 114 provided on the outer peripheral side of the lowermost mountain-folding peripheral edge 113 applies the load from the bellows part 11 evenly in the circumferential direction to the mounting part 12, for example, the elasticity of the bottom face 121 The deformation is suppressed to the extent that the outer peripheral side is equal to the circumferential direction and is slightly pushed down. Then, the step formed by the fitting recess 124 prevents the influence of elastic deformation from being transmitted from the bottom surface 121 to the horizontal annular flange 122, thereby fitting the horizontal annular flange 122 to the mounting groove 21 of the upper collar 2. Is maintained, and the mounting state of the dust cap 1 with respect to the upper collar 2 is stabilized.

  If the horizontal annular flange 122 is to be greatly elastically deformed, although not shown in the figure, the vertical annular flange 123 engages with the main body 22 of the upper collar 2 and the horizontal annular flange 122 is crushed. The situation is prevented from being detached from the mounting groove 21 due to deformation. In this way, the bottom surface 121 is formed with the outer annular rib 114 as the outer periphery, a fitting recess that defines the annular horizontal flange 122 and the bottom surface 121 is formed, and the section is formed by the annular horizontal flange 122 and the vertical annular flange 123. The present invention provides a dust-proof cap 1 with a stable mounting state by the mounting portion 12 constituting an L-shaped circumferential portion.

It is a front view showing an example of a dustproof cap based on the present invention. It is sectional drawing of the dustproof cap of this example. It is a top view of the dustproof cap of this example. It is a bottom view of the dust cap of this example. It is sectional drawing showing the state to which the upper eyelid which attached the dustproof cap of this example fell. It is sectional drawing showing the state in which the upper eyelid which attached the dustproof cap of this example rose.

Explanation of symbols

1 Dust-proof cap
11 Bellows
111 Valley rim
112 Inner ring rib
113 Edge of mountain break
114 Outer annular rib
12 Mounting part
121 Bottom
122 Horizontal annular flange
123 Vertical annular flange 2 Upper collar
21 Mounting groove
22 Main unit
23 Punch part

Claims (4)

A dust-proof cap that is attached to the upper collar of the rotary press, and that engages with a bellows portion that expands and contracts along the main body portion of the upper collar, and a mounting groove provided at the boundary between the main body portion and the punch portion of the upper collar. In the resin dust-proof cap integrally formed with the mounting portion, the mounting portion includes a bottom surface having an outer periphery of the bent peripheral edge of the bellows portion, a horizontal annular flange formed by opening a hole in the bottom surface, and the horizontal annular flange. A vertical annular flange formed to surround the horizontal annular flange, and the horizontal annular flange is fitted into the mounting groove of the upper collar, and the vertical annular flange is attached to the main body of the upper collar continuous with the mounting groove. Dust-proof cap. The bellows part has an inner annular rib on the inner peripheral side of the bent peripheral edge that becomes a valley when viewed from the outside, and an outer annular rib on the outer peripheral side of the bent peripheral part that becomes a mountain when viewed from the outer side. The dust cap according to claim 1, which is formed respectively. The dust-proof cap according to claim 2, wherein the bottom surface is formed with a fitting recess on the side opposite to the vertical annular flange, and the end surface of the punch portion of the upper collar sandwiching the mounting groove is fitted into the fitting recess. The dust cap according to claim 1 or 3, wherein the vertical annular flange is chamfered with the upper end edge inclined inward.

Images