JP2018012140A - Can forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a can forming apparatus which can efficiently supply compressed gas to a rotating turn table without leaking.SOLUTION: A gas supply groove extending in an arc shape is arranged on a contact surface of a fixed ring member. A slide ring member includes a plurality of slide side pipes. Each of the slide side pipes is connected to a gas supply pipe extending from a can body holding part at one end, and is opened in a position overlapping with the gas supply groove of a slide surface at the other end, and a torus-shaped tension ring member arranged at a predetermined interval from the fixed ring member is arranged on a support surface side as a surface opposite to the contact surface of the fixed ring member. Biasing means which uniformly presses the contact surface of the fixed ring member to the slide surface of the slide ring member is arranged between the tension ring member and the fixed ring member.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a compressed gas supply mechanism in a can molding apparatus.

  As a can that is filled and sealed with contents such as beverages, a bottomed cylindrical can having a can body (wall) and a bottom (bottom), and a screw cap is screwed onto the open end of the can Bottled cans are known. The can body of such a bottle can is squeezed obliquely so that the upper part is constricted, and a screw groove for screwing a screw cap is provided on the opening side.

  When manufacturing such a bottle can, for example, a drawing (drawing) of a metal plate made of aluminum or aluminum alloy into a cup shape (can base material) is redrawn and sidewalls using a can molding device. Is stretched by several stages of ironing. After adjusting the height of the can body thus obtained by trimming, printing is performed on the peripheral surface of the can body. Then, a bottle can is manufactured through the necking process which performs the drawing process of the opening end side of a can body.

  In manufacturing such a bottle can, a bottle necker that is a can forming apparatus used in a necking step rotates a turntable in which a large number of can body holding portions that support the bottom side of the can body are arranged in an annular shape. Then, the opening end side of the can body held by the can body holding portion is drawn in stages by a necking mold arranged in a ring shape on the die table so as to face each can body holding portion. (For example, refer to Patent Document 1).

  On the other hand, in the slide air valve mechanism described in Patent Document 2, in order to supply the molding gas to the rotating can body holding portion, a fixing member having a plurality of long grooves through which the gas flows is provided. And, by moving one end of the gas supply pipe extending from each can holding part along this long groove as the can holding part rotates, gas can be supplied even if the can holding part rotates. It has a simple structure.

Japanese Patent No. 5049564 US Pat. No. 8,627,705

  In the slide air valve mechanism disclosed in Patent Document 2, a member (sliding member) holding one end side of a gas supply pipe extending from a can holding unit is slidable with respect to a fixing member having a long groove. Touching. In such a contact surface between the fixed member and the sliding member, the higher the pressure of the supplied gas, the more the gas leaks and the gas pressure tends to decrease. Therefore, there is a problem that it is difficult to efficiently supply the compressed gas.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a can molding apparatus that can efficiently supply compressed gas without leaking toward a rotating turntable. .

  In order to solve the above-described problem, the can molding apparatus according to the embodiment includes a turntable in which a large number of can body holding portions that detachably hold a can body are arranged, and that can rotate around a rotation axis, and the rotation axis. A sliding ring member that rotates together with the turntable, and a fixed ring member provided with a contact surface that is slidably in contact with a sliding surface of the sliding ring member. An air supply groove extending in an arc shape provided on the contact surface of the fixed ring member, and one end connected to an air supply pipe provided on the sliding ring member and extending from the can body holding portion. A plurality of sliding-side pipes opened at positions overlapping the air supply grooves of the sliding surface, a tension ring member provided on the support surface side opposite to the contact surface of the fixing ring member, The tension ring member and the fixed ring member Is provided between the ring member, characterized in that the contact surface of the stationary ring member and a biasing means for pressing toward the sliding surface of the sliding ring member.

  The compressed air introduced into the can holding part is fed from an air supply groove provided in the fixed ring member via a sliding ring member that rotates together with the turntable. For this reason, the contact surface of the fixed ring member that is slidably contacted and the sliding surface of the sliding ring member are in contact with each other with a uniform pressing force so that the contact surface between the fixed ring member and the sliding ring member It is necessary to prevent compressed air from leaking out.

  In the can molding apparatus of the present embodiment, an urging means is provided between the tension ring member and the fixed ring member. By such an urging means, the fixing ring member is strongly pressed against the sliding ring member. As a result, local leakage of compressed air due to uneven pressing force can be reliably prevented.

The urging means includes a coiled push spring and a tension ring member that is pivotally locked, extends toward the fixed ring member, and at least a tip portion of a receiving portion provided on the fixed ring member. A screw member engaged with the screw spring, wherein the screw member is inserted along an extension / contraction direction of the push spring.
By adjusting the amount of protrusion (protrusion length) from the air chamber ring by rotating the screw member, the distance between the fixing ring member and the sliding ring member changes. The pressing force on the ring member can be easily changed.
As a result, the contact surface of the fixed ring member is slid by selectively rotating the screw member where the pressing force of the fixing ring member against the sliding ring member is locally high or low to adjust the pressing force. It can be easily adjusted to press against the sliding surface of the moving ring member with a uniform pressing force as a whole.
In addition, the rotation operation of the screw member for adjusting the pressing force of the fixing ring member can be easily approached from the surface side of the air chamber ring, and the maintainability can be improved.

A plurality of the screw members are provided along the circumference of the tension ring member while maintaining the same circumferential angle.
Thereby, the contact surface of the fixed ring member can be pressed against the sliding surface of the sliding ring member with a uniform pressing force as a whole.

The receiving portion is provided on both sides of the air supply groove.
Thereby, the contact surface of the fixed ring member can be pressed against the sliding surface of the sliding ring member with a uniform pressing force as a whole.

The screw member is screwed into a screw hole provided in the tension ring member, and the biasing force of the fixed ring member against the sliding ring member can be adjusted by rotating the screw member. To do.
As a result, the distance between the tension ring member and the fixed ring member can be changed simply by rotating the screw member, and the urging force of the fixed ring member against the sliding ring member can be easily adjusted.

Between the tension ring member and the fixed ring member, there is further provided a position restricting means for restricting relative position fluctuations, and the position restricting means is fixed to the fixed ring member and attached to the tension ring member. And a guide pin extending toward the tension ring member, and an engagement hole into which the distal end side of the guide pin is inserted.
The air chamber ring is pressed straight toward the fixing ring member by the engagement between the distal end portion of the guide pin constituting the position restricting means and the engagement hole. Accordingly, the air chamber ring can be easily attached to the fixed ring member at the correct position during maintenance of the air chamber ring. Further, it is possible to reliably prevent the positional deviation between the fixing ring member and the air chamber ring due to vibration or the like during molding.

  The air supply grooves are provided in one row along the circumferential direction at a center portion in the width direction of the contact surface of the fixing ring member.

  ADVANTAGE OF THE INVENTION According to this invention, the can shaping | molding apparatus which can supply efficiently, without leaking compressed gas toward the rotating turntable can be provided.

It is the flowchart which showed the manufacturing process of the can in steps. It is a schematic diagram which shows the change of the can body shape in each process. It is an external appearance perspective view which shows a can shaping | molding apparatus (necking processing apparatus). It is an external appearance perspective view which shows a can body holding | maintenance part and its peripheral part. It is a principal part expansion perspective view which shows a part of turntable. It is a principal part expansion perspective view which shows the attachment part of a turntable and a main-body part. It is a principal part expansion perspective view which shows a part of turntable. It is a principal part expansion perspective view which shows the principal part of a turntable. It is a principal part expanded sectional view which shows the contact part of a sliding ring member and a fixed ring member. It is a partially broken perspective view which shows a sliding ring member. It is a partially broken perspective view which shows a fixing ring member and a supporting member. It is a schematic plan view when a fixing ring member is looked down on. It is a top view which shows arrangement | positioning of the screw member when an air chamber ring is seen from the outer side. FIG. 10 is a schematic cross-sectional view including a contact portion of a sliding ring member and a fixing ring member at a position different from that in FIG. 9.

  Hereinafter, a can forming apparatus according to an embodiment of the present invention will be described with reference to the drawings. Each embodiment described below is specifically described for better understanding of the gist of the invention, and does not limit the present invention unless otherwise specified. In addition, in the drawings used in the following description, in order to make the features of the present invention easier to understand, there is a case where a main part is shown in an enlarged manner for convenience, and the dimensional ratio of each component is the same as the actual one. Not necessarily.

First, a series of steps for manufacturing a bottle can which is an example of a can body will be described.
FIG. 1 is a flowchart showing an example of a bottle can manufacturing process step by step. FIG. 2 is a schematic diagram showing changes in the can shape in each step.
For the bottle can, the plate blanking process S1, the cupping process (drawing process) S2, the DI process (drawing and ironing process) S3, the trimming process S4, the printing / painting (can outer surface) process S5, the painting (can inner surface) process S6, the necking process The can is manufactured through S7 and the screw forming step S8 in this order.

  In the plate material punching step S1, for example, a rolled material made of an aluminum alloy material is punched, and a disk-shaped plate material (blank) W as shown in FIG. 2A is formed (punched). In the cupping step (drawing step) S2, as shown in FIG. 2B, the plate material W is drawn (capping) by a cupping press to form a cup-shaped body (can base material) W1. In the DI step (drawing and squeezing step) S3, as shown in FIG. 2 (c), DI processing (re-drawing and squeezing processing) is performed on the cup-shaped body W1 by a DI processing device, and the can body 11 and the bottom 14 Is formed into a bottomed cylindrical can body W2.

  In the trimming step S4, since the height of the opening end 11a of the can body W2 is not uniform, the trimming of the opening end 11a is performed using a trimming device, and the can body as shown in FIG. The can body W3 after the trimming process in which the heights of the 11 open end portions 11a are evenly aligned over the entire circumference is formed.

  Thereafter, the can body W3 is washed to remove the lubricating oil and the like, and then subjected to a surface treatment and dried. Then, as shown in FIG. 2 (e), printing and coating of the outer surface side 11b of the can body W3 are performed. (Printing / painting (can outer surface) step S5), and then the inner surface 11c of the can body W3 is coated (painting (can inner surface) step S6).

  Next, using a necking die (molding tool), a neck portion 12 (see FIG. 2 (f)) having a constricted shape so as to incline smoothly on the opening end 11 a side of the can body 11. Molding (necking step S7). Furthermore, a screw groove (see FIG. 2 (g)) that matches the shape of the cap is provided in the neck portion 12 at the opening end portion of the neck portion 12 using a screw tool (forming tool) (screw forming step S8). ). The can forming apparatus according to the present embodiment is a necking processing apparatus used in such a necking step S7 and a screw forming step S8. In this manner, a can body (bottle can) 10 having a constricted neck portion 12 on the open end 11a side of the can body 11 is manufactured.

  The can body (bottle can) 10 obtained through each of the above steps is then filled with contents such as beverages inside, and further fitted with the screw groove 13 to cover the opening of the neck portion 12. Is attached, and the inside of the can 10 is sealed.

FIG. 3 is an external perspective view showing a can forming apparatus (necking apparatus) according to an embodiment of the present invention. FIG. 4 is an external perspective view showing the can body holding portion and the peripheral portion thereof. FIG. 5 is an enlarged perspective view of a main part showing a part of the turntable. FIG. 6 is an enlarged perspective view of a main part showing a mounting portion between the turntable and the main body. FIG. 7 is an enlarged perspective view of a main part showing a part of the turntable.
The can forming device (necking processing device) 20 is a can forming device used in the above-described necking step S7 and screw forming step S8, for example, and a main body provided with a rotation mechanism (not shown) and a reciprocating mechanism (not shown). A turntable 23 that rotates about a rotation axis C of the main shaft 28 of the main body portion 21, and a die table 24 that is arranged to face the turntable 23. In the vicinity of the center direction of the turntable 23, a sliding ring member 25 and a fixed ring member 26 (see FIG. 5) are provided.

  The turntable 23 is formed by, for example, a large number of can holders 31 arranged in an annular shape on one side 23a (see FIG. 5) facing the die table 24 in a ring-shaped table main body 23A. The turntable 23 is supported by an index 27 provided on the frame constituting the main body 21 (see FIG. 6), and rotates about the rotation axis C of the main shaft 28 intermittently. The main shaft 28 is rotated by a rotation mechanism (not shown) constituted by a motor or the like provided in the main body 21.

  The main body 21 is provided with a bumper 29 that receives the outer peripheral portion of the turntable 23 on the main body 21 side. The bumper 29 receives an impact applied to the turntable 23 by the reciprocating motion of the die table 24.

  The can body holding part 31 can move linearly within the recess 32 into which the lower part (bottom part) of the can body 10 is inserted, the holding mechanism 33 provided on the inner peripheral surface of the recess 32, and the cylinder 39. And an extrusion piston 34 provided. When a gas pressure is applied to the holding mechanism 33 by, for example, sending compressed air (compressed gas) from the air supply pipe 35, the elastic member 36 such as rubber bulges from the inner peripheral surface of the recess 32, and the inner diameter of the recess 32 is increased. Narrow.

  Thereby, the lower peripheral surface of the can body 10 inserted into the recess 32 is sandwiched by the elastic members 36, and the can body 10 is stably held by the can body holding portion 31. In order for the can body holding part 31 to hold the can body 10 stably, it is preferable to apply a predetermined gas pressure from the air supply pipe 35 to the expansion member 36.

  The push-out piston 34 is provided so as to be movable along the X axis, which is the insertion / removal direction of the can body 10, and after reducing the gas pressure applied to the expansion / contraction member 36, compressed air is supplied from the opening 39 a on the rear end side of the cylinder 39. The can body 10 is discharged from the can body holding portion 31 by projecting the extrusion piston 34 into the recess 32. The cylinder 39 is provided with a pressure adjusting hole (gas vent hole) 58 in order to release the air compressed in the cylinder 39 by the movement of the pushing piston 34. For example, the pressure adjusting hole 58 may be a through hole that allows the inside and the outside of the cylinder 39 to communicate with each other.

  Referring to FIG. 3 again, the die table 24 includes, for example, a large number of molding tools such as molding dies (on the one side 24a facing the turntable 23 of the table body 24A provided with a ring-shaped flat plate. .. Are arranged in an annular shape. Further, as a forming tool, a screw tool 42 for forming a screw groove 13 (see FIG. 2G) in the neck portion 12 of the can body 10 is also arranged.

  The die table 24 is attached to one end of a crankshaft (not shown) that reciprocates along the extending direction of the rotary shaft C. The crankshaft is connected to a reciprocating mechanism (not shown). The reciprocating mechanism reciprocates the die table 24 along the extending direction of the rotating shaft C via the crankshaft. Thereby, the die table 24 reciprocates so that the space | interval between the turntables 23 may be narrowed or expanded. The die table 24 performs only reciprocation along the extending direction of the rotation axis C without rotating.

  The molding die (molding tool) 41 is positioned from the position corresponding to the can body insertion position where the neck portion pushes the unmolded can body W3 (see FIG. 2 (e)) into the can body holding portion 31 in the turntable 23. It is composed of a large number of molding dies 41, 41... Whose shape is changed step by step so that the neck portion 12 is formed gradually (stepwise) along the turning direction of the turntable 23. Yes.

  As shown in FIG. 6, a slide ring member 25, a fixed ring member 26, and an air chamber ring (tension ring member) 53 are provided near the main shaft 28 of the turntable 23. The main body 21 is provided with an index 27, an air chamber ring bracket 54, and an index mounting flange 55. The turntable 23 is supported by the index 27 and is rotated intermittently.

  A pressure pipe 52 is provided inside the air chamber ring bracket 54 and the index mounting flange 55 and is connected to a fixed side pipe 48 described later. The end of the pressure pipe 52 on the index mounting flange 55 side is connected to a compressed air supply source, for example, a compressor (not shown). With such a configuration, the compressed air flows from the main body 21 through the air chamber ring bracket 54 to the front side (die table 24 side) of the turntable 23, and from the air chamber ring (tension ring member) 53 side to the fixed ring member 26. Supplied.

FIG. 8 is an enlarged perspective view of a main part in which a part of FIG. 5 is enlarged. FIG. 9 is a schematic cross-sectional view including contact portions of the sliding ring member and the fixed ring member.
The sliding ring member 25 is formed of an annular member having a rectangular cross section, and rotates with the turntable 23 coaxially with the turntable 23. The sliding ring member 25 is slidably in close contact with the contact surface 26a of the fixed ring member 26 at the sliding surface 25a (see FIG. 9).

  The compressed air supplied from the gas supply means is supplied from the pressure pipe 52 to the air supply groove 45 through the fixed side pipe 48 of the fixed ring member 26. And the elastic member 36 which comprises the holding mechanism 33 of the can holding | maintenance part 31 via the air supply pipe 35 from the sliding side piping 43 of the sliding ring member 25 in which one end faces this air supply groove 45 (refer FIG. 4). To be supplied.

  As shown in FIG. 10, a large number of sliding side pipes 43 are provided inside the sliding ring member 25. In the present embodiment, the number of sliding side pipes 43 corresponding to the number of arranged can body holding portions 31, 31... Is provided at equal intervals along the circumferential direction of the sliding ring member 25. Each sliding side pipe 43 has a shape refracted into an L shape inside the sliding ring member 25. Each sliding side pipe 43 is connected to an air supply pipe 35 extending at one end side from each of the can body holding portions 31, 31. Further, the other end side of the sliding side pipe 43 is opened at a position overlapping the air supply groove 45 provided in the fixed ring member 26 on the sliding surface 25a.

  The air supply pipe 35 connecting the can body holding part 31 and one end side of the sliding side pipe 43 is bundled so that the air supply pipes 35 of the adjacent can body holding parts 31 form a pair. The members 49 may be bundled.

  The fixed ring member 26 is fixed at a fixed position without rotating, and allows the sliding ring member 25 to slide on the contact surface 26a with respect to the sliding ring member 25 that rotates together with the turntable 23. And it touches so that airtightness is maintained.

  The fixing ring member 26 is an annular member having a rectangular cross section as a whole, and is composed of a plurality of divided bodies 46, 46... Each having an arc shape. In the present embodiment, the annular fixing ring member 26 is formed by combining eight divided bodies 46A, 46B, 46C, 46D, 46E, 46F, 46G, and 46H (see FIG. 12). Since the fixing ring member 26 is in contact with the sliding ring member 25 at all times when the turntable 23 is rotated, the fixing ring member 26 is divided into a plurality of divided bodies in order to improve maintenance such as replacement due to wear. 46, 46...

  As shown in FIG. 11, the fixing ring member 26 composed of the plurality of divided bodies 46, 46... Is supported by a support member (air chamber base metal) 47 on the back surface opposite to the contact surface 26a. That is, the divided bodies 46 </ b> A to 46 </ b> H (see FIG. 12) are each fixed to an annular shape by being screwed to the support member 47, thereby forming the fixed ring member 26. The support member (air chamber base metal) 47 is formed by combining two semicircular members, for example, and is supported by the air chamber ring 53 (see FIG. 7) at a predetermined interval. ing. The fixing ring member 26 is made of an engineering plastic having excellent wear resistance and durability, such as polyacetal, polyamide, polycarbonate, polybutylene terephthalate, and fluororesin.

  The fixing ring member 26 is provided with an air supply groove 45 formed of a long groove having a concave cross section that is dug down in the thickness direction from the contact surface 26a (see FIG. 9). That is, an air supply groove 45 extending in an arc shape is provided on each contact surface 26a of the divided bodies 46A to 46H (see FIG. 12).

  As shown in FIG. 12, the air supply groove 45 is a row of grooves extending along a virtual circle R set in the vicinity of the center of the contact surface 26a in the width direction. The length along the longitudinal direction (the virtual circle R direction) of the first air supply groove 45A is shortened between the air supply groove 45A and one end side and the other end side of the first air supply groove 45A. The second air supply groove 45 </ b> B is provided independently of the one air supply groove A and extends along the virtual circle R. That is, the air supply groove 45 includes a first air supply groove A and a second air supply groove 45B that do not communicate with each other on the contact surface 26a.

  As shown in FIG. 7, an annular air chamber ring (tension ring member) 53 is fixed to an air chamber ring bracket 54. The fixing ring member 26 is pressed against the sliding ring member 25 with a predetermined distance from the air chamber ring 53.

  Between the air chamber ring 53 and the fixed ring member 26, an urging means 61 that presses the contact surface 26a of the fixed ring member 26 evenly against the slide surface 25a of the sliding ring member 25 is provided.

  As shown in FIG. 9, the urging means 61 extends toward the fixed ring member 26 by being rotatably locked to a coil-shaped push spring (coil spring) 62 and an air chamber ring (tension ring member) 53. And a screw member (center pin) 63.

  The screw member 63 is rotatably engaged with a screw hole 64 provided in the air chamber ring 53. Thereby, by rotating the screw member 63, the protrusion amount (protrusion length) from the air chamber ring 53 on the tip end side of the screw member 63 can be arbitrarily adjusted.

The push spring 62 has a screw member 63 inserted inside the coil along the direction of expansion and contraction.
Further, on the support surface 26 b side of the support member (air chamber base metal) 47 constituting the fixing ring member 26, the tip end portion of the screw member 63 and a part of the push spring 62 are located at a position overlapping the formation position of the screw member 63. A receiving portion (spring recess) 65 into which is inserted and engaged is provided.

FIG. 13 is a plan view showing the arrangement of screw members (center pins) when the air chamber ring is viewed from the outside.
In the present embodiment, the screw member (center pin) 63 is located at a position corresponding to the inside and the outside of one row of the air supply grooves 45 provided on the contact surface 26a of the fixing ring member 26. A plurality are provided along the circumference while maintaining the same circumferential angle. The receiving portions (spring recesses) 65 into which the screw members 63 are fitted are provided on both sides of the air supply groove 45 of the fixing ring member 26.

  In the example shown in FIG. 13, the screw member (center pin) 63 corresponds to the inside and the outside of the air supply groove 45 along the circumference of the air chamber ring 53 with a circumferential angle of 22.5 °. A total of 32 are provided at the positions.

  The urging means 61 composed of such a coil-shaped pressing spring (coil spring) 62 and a screw member (center pin) 63 causes the fixed ring member 26 to move to the sliding ring member 25 by the urging force of the pressing spring (coil spring) 62. Press.

  That is, the urging means 61 provided on the air chamber ring 53 fixed to the air chamber ring bracket 54 is a support member (air) that constitutes the fixed ring member 26 by the urging force of the pushing spring (coil spring) 62 in the extending direction. The contact surface 26 a of the divided body 46 is pressed against the sliding surface 25 a of the sliding ring member 25 from the support surface 26 b side of the chamber base metal 47.

  The pressing pressure (pressing force) of the fixed ring member 26 against the sliding ring member 25 by the urging means 61 is the amount of protrusion from the air chamber ring 53 on the tip side of the screw member 63 by rotating the screw member 63 ( It can be arbitrarily adjusted by adjusting the protrusion length. That is, as the protrusion amount (protrusion length) from the air chamber ring 53 on the distal end side of the screw member 63 is increased, the interval between the air chamber ring 53 and the fixing ring member 26 is widened, and the sliding of the fixing ring member 26 is performed. The pressing force against the ring member 25 is increased.

FIG. 14 is a schematic cross-sectional view including contact portions of the sliding ring member and the fixing ring member at positions different from those in FIG. 9.
Between the air chamber ring (tension ring member) 53 and the fixed ring member 26, there is further provided a position restricting means 67 for restricting the relative position fluctuation. The position restricting means 67 is fixed to the fixed ring member 26 and extends toward the air chamber ring (tension ring member) 53. The position restricting means 67 is provided on the air chamber ring 53, and the distal end side of the guide pin 68 is inserted. A joint hole 69 is provided. Examples of a method for fixing the guide pin 68 to the fixing ring member 26 include a method of engaging the guide pin 68 with a screw.

  More specifically, the guide pin 68 is provided so as to protrude from the support member (air chamber base metal) 47 constituting the fixing ring member 26 toward the surface of the air chamber ring 53 on the fixing ring member 26 side, Further, the engagement hole 69 is provided at a position corresponding to the formation position of the guide pin 68 on the surface of the air chamber ring 53 on the fixed ring member 26 side. A male screw is formed on the fixed ring member 26 side of the guide pin 68, and a female screw is formed on the fixed ring member 26. By screwing these screws, the guide pin 68 is fixed to the fixed ring member 26. Yes. In the present embodiment, the guide pin 68 is provided at an intermediate point between the screw members (center pins) 63 outside the air supply groove 45 (see FIG. 13).

  The engagement hole 69 is, for example, a through hole that penetrates the tip portion of the guide pin 68. A buffer member (bush) 71 is formed in the gap between the guide pin 68 and the engagement hole 69. Note that the engagement hole 69 may be a recess into which the distal end portion of the guide pin 68 is inserted.

  The guide pin 68 may be formed integrally with the air chamber ring (tension ring member) 53, but may be configured such that another pin-like member is provided on the air chamber ring 53 by screwing or joining. Also good.

  Such a position restricting means 67 engages with the front end portion of the guide pin 68 and the engagement hole 69 to press (push) the air chamber ring 53 straight toward the fixed ring member 26. Regulate the direction of movement.

  The operation of the can molding apparatus 20 of the present embodiment having the above configuration will be described. For example, when producing a bottle can having a neck portion 12 by drawing the can body W3 (see FIG. 2E) formed in the previous process by the can molding apparatus 20, the can body A bottom portion of the can body W3 is inserted into the concave portion 32 (see FIG. 4) of the holding portion 31, and compressed air is introduced into the holding mechanism 33 to hold the can body W3. The neck portion 12 and the screw groove 13 are formed on the can body W3 by a molding tool such as.

  The compressed air introduced into the holding mechanism 33 is fed from an air supply groove 45 provided in the fixed ring member 26 through a sliding ring member 25 that rotates together with the turntable 23. For this reason, the contact surface 26a of the fixed ring member 26 and the slide surface 25a of the slide ring member 25 that are slidably in contact with each other are in contact with each other with a uniform pressing force so that the fixed ring member 26 and the slide ring are in contact with each other. It is necessary to prevent compressed air from leaking from between the members 25.

  In the can molding apparatus 20 of the present embodiment, as an urging means 61 of the fixing ring member 26, a coil-shaped pressing spring (coil spring) 62 and an air chamber ring (coil spring) 62 are provided between the air chamber ring 53 and the fixing ring member 26. A screw member (center pin) 63 that is pivotably locked to the tension ring member 53 and extends toward the fixed ring member 26 is provided.

  The fixing ring member 26 is strongly pressed against the sliding ring member 25 by the extension force of the pressing spring 62. Then, a screw member (center pin) 63 into which the push spring 62 is inserted is placed at a position corresponding to the inside and the outside of one row of the air supply grooves 45 provided on the contact surface 26a of the fixing ring member 26, respectively. By arranging the same circumferential angle along the circumference of 53, the contact surface 26a of the fixed ring member 26 is applied to the sliding surface 25a of the sliding ring member 25 with a uniform pressing force as a whole. It becomes possible to press. As a result, local leakage of compressed air due to uneven pressing force can be reliably prevented.

  In addition, by rotating the screw member (center pin) 63 and adjusting the amount of protrusion (projection length) from the air chamber ring 53, the distance between the fixed ring member 26 and the sliding ring member 25 changes. The pressing force of the fixed ring member 26 against the sliding ring member 25 by the urging means 61 can be easily changed.

  The fixing ring member 26 is adjusted by selectively rotating the screw member (center pin) 63 where the pressing force of the fixing ring member 26 on the sliding ring member 25 is locally high or low to adjust the pressing force. The contact surface 26a can be easily adjusted so as to be pressed against the sliding surface 25a of the sliding ring member 25 with a uniform pressing force as a whole.

In addition, the rotation operation of the screw member (center pin) 63 for adjusting the pressing force of the fixing ring member 26 can be easily approached from the surface side of the air chamber ring 53, and the maintainability can be improved. .
Further, by adopting a configuration in which the push spring 62 is inserted into the screw member (center pin) 63, the push spring 62 is detached from between the air chamber ring 53 and the fixed ring member 26 during maintenance of the biasing means 61. It can be prevented from being lost.

  In the can molding apparatus 20 of the present embodiment, the air ring is fixed to the fixing ring member 26 between the air chamber ring (tension ring member) 53 and the fixing ring member 26 and directed toward the air chamber ring (tension ring member) 53. A position restricting means 67 having a guide pin 68 extending in the direction and an engagement hole 69 provided in the air chamber ring 53 and into which the tip end side of the guide pin 68 is inserted is provided.

  The air chamber ring 53 is pressed straight toward the fixed ring member 26 by the engagement between the distal end portion of the guide pin 68 constituting the position restricting means 67 and the engagement hole 69. Thereby, the air chamber ring 53 can be easily attached to the correct position with respect to the fixed ring member 26 at the time of maintenance of the air chamber ring 53 or the like. Further, it is possible to prevent the positional deviation between the fixing ring member 26 and the air chamber ring 53 due to vibration or the like during molding.

  Moreover, in the can molding apparatus 20 of this embodiment, the maintenance of the split bodies 46, 46... Of the fixed ring member 26 that is easily worn by sliding with the sliding ring member 25 can be easily performed. That is, the compressed gas for holding the can body is introduced from the front side of the turntable 23 (the die table 24 side) to the turntable 23 through the pressure pipe 52 and the fixed side pipe 48. Therefore, the divided bodies 46, 46... Can be easily replaced from the front side of the turntable 23, and maintenance can be performed.

  As mentioned above, although embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  For example, in the above-described embodiment, the molding die 41 and the screw tool 42 are given as a large number of molding tools arranged on the die table 24. However, the molding tools attached to the die table are not limited to these, and cans The shaping | molding tool which provides arbitrary shapes to a body can be used, and the kind of shaping | molding tool is not limited.

10 ... can body (bottle can)
20 ... Can molding equipment (necking equipment)
DESCRIPTION OF SYMBOLS 21 ... Main body part 23 ... Turntable 24 ... Die table 25 ... Sliding ring member 26 ... Fixed ring member 31 ... Can body holding part 45 ... Air supply groove 46 ... Divided body 47 ... Support member 53 ... Air chamber ring (tension ring) Element)
61 ... Biasing means 62 ... Push spring (coil spring)
63 ... Screw member (center pin)
65 ... receiving portion 67 ... position restricting means 68 ... guide pin 69 ... engagement hole

Claims (7)

A large number of can body holding portions for detachably holding the can body are arranged, a turntable that can rotate around a rotation axis, a sliding ring member that rotates together with the turntable around the rotation axis, and the slide A fixed ring member provided with a contact surface slidably contacting the sliding surface of the moving ring member,
An air supply groove extending in an arc shape provided on the contact surface of the fixing ring member;
A plurality of sliding sides provided on the sliding ring member, one end of which is connected to an air supply pipe extending from the can holding portion and the other end is opened at a position overlapping the air supply groove of the sliding surface. Piping,
A tension ring member provided on a support surface side opposite to the contact surface of the fixing ring member;
Biasing means provided between the tension ring member and the fixing ring member, and pressing the contact surface of the fixing ring member toward the sliding surface of the sliding ring member. Can forming equipment.   The urging means includes a coiled push spring and a tension ring member that is pivotally locked, extends toward the fixed ring member, and at least a tip portion of a receiving portion provided on the fixed ring member. The can forming apparatus according to claim 1, further comprising: a screw member that engages the screw member, wherein the screw member is inserted along an expansion / contraction direction of the push spring.   The can forming apparatus according to claim 2, wherein a plurality of the screw members are provided while maintaining an equal circumferential angle along the circumference of the tension ring member.   The can forming apparatus according to claim 2 or 3, wherein the receiving portion is provided on both sides of the air supply groove.   The screw member is screwed into a screw hole provided in the tension ring member, and the biasing force of the fixed ring member against the sliding ring member can be adjusted by rotating the screw member. The can molding apparatus according to any one of claims 2 to 4.   Between the tension ring member and the fixed ring member, there is further provided a position restricting means for restricting relative position fluctuations, and the position restricting means is fixed to the fixed ring member and attached to the tension ring member. The can forming apparatus according to any one of claims 1 to 5, further comprising: a guide pin extending toward the end; and an engagement hole provided in the tension ring member and into which a distal end side of the guide pin is inserted.   The said air supply groove | channel is provided in 1 row along the circumferential direction in the center part of the width direction in the said contact surface of the said fixing ring member, The Claim 1 thru | or 6 characterized by the above-mentioned. Can molding equipment.

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