JP4351850B2 - Tab feeder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tab supply device for supplying a tab fixed to a can lid from a stack to a can lid forming press device, and particularly to a tab supply device capable of detecting an abnormal posture tab.
[0002]
[Prior art]
Conventionally, as a lid of a beverage can, an opening piece surrounded by a score line so as to leave between the both ends of the score line as a hinge portion is pushed down by a tab fixed with a rivet in the center of the can lid and opened. A tab-type can lid is used. When manufacturing such a canon tab type can lid, a large number of tabs formed by a dedicated tab forming press device and individually punched are stored and held in a stacked state in which the front and back sides and directions are aligned. Thereafter, the tabs are transferred to a tab supply device, and the tabs are supplied to the can lid forming press device one by one with a tab pusher, and the can lid that has been subjected to rivet molding and score forming with the can lid forming press device. After fitting the rivet with the rivet hole formed in the tab, the top of the rivet is caulked and the tab is fixed to the can lid.
[0003]
As a means for supplying the tab to the tab fixing step, for example, in the tab supply device described in Japanese Patent Publication No. 6-259 (Patent Document 1), the tab formed by the tab forming press device is once continuously supplied. The tab stocker is housed in a tab stocker capable of automating tab removal, and is supplied from the tab stocker to a can lid forming press device by a tab supply device.
[0004]
[Patent Document 1]
Japanese Examined Patent Publication No. 6-259 [0005]
[Problems to be solved by the invention]
In a conventional tab supply device that forms a tab with a tab forming press device and then stores the tab stocker in a tab stocker and supplies the tab to the can lid forming press device, the tab stocker is used when the tab is formed and then stored in the tab stocker. There is a possibility that the tab may be sent to the tab fixing process of the can lid forming press device in the state where the front and back of the tab and the direction are reversed, that is, in the state of the abnormal posture tab when the tab is transferred from the tab to the stack of the tab feeding device. is there.
[0006]
If a tab with a so-called abnormal posture is supplied to the tab fixing process, the tab may become clogged in the middle, and the tab may not be sent to the tab fixing process, or the tab may be fixed to the can lid with the tabs reversed. is there. Or, because the tab is in an abnormal posture, it is sent to the tab fixing process in an unstable state, and the tab falls into the mold and gets mixed in, so that the scrap mark or scrap Failures such as leakage due to biting may occur.
[0007]
The present invention has been made paying attention to the above technical problem, and provides a tab supply device capable of detecting an abnormal posture tab when supplying the tab to the tab fixing process of the can lid forming press device. It is intended to do.
[0008]
[Means for Solving the Problem and Action]
In order to achieve the above object, according to the first aspect of the present invention, tabs that are fixed to the rivet portion of the can lid, have recesses on the back surface, and have different shapes for each of the front and back sides and directions are stored in a stacked state. Provided at the leading end of the stack with a tab placement portion for receiving one of the tabs carried out of the stack, and reciprocating in a direction perpendicular to the arrangement direction of the tabs in the stack In a tab supply device provided with a tab pusher that cuts out tabs one by one from the stack, detection that outputs an abnormal signal when the posture of the tab received by the tab mounting portion is different from the normal posture and a manual stage, the detection means, when the tab is normal posture on said tab mounting portion, said tab is fitted into the recess portion without floating, and said tab mounting on part The tab pusher is formed on the tab placement portion of the tab pusher so that the tab is lifted on the tab placement portion by interfering with the tab when the tab has an abnormal posture including a posture in which the front and back sides and the orientation are reversed. The protrusion is disposed above the tab pusher, and the front edge of the stack is formed on an inclined surface that is inclined upward and retracts to the inside of the stack and advances downward to the outside. The tab pusher is passed when the tab is placed in a normal position on the mounting portion, and the tab is placed in the abnormal posture, and the tab and the protrusion interfere with each other and the tab is lifted A guide member whose tab interferes with the inclined surface, and a displacement mechanism that elastically displaces the tab pusher downward when the tab and the inclined surface of the guide member interfere with each other. Serial tab pusher Ru apparatus der, characterized in that a switch for outputting the abnormal signal closes contacts by displaced downward.
According to a second aspect of the present invention, in the first aspect of the invention, the switch is a ground arranged with a gap below the tab pusher so as to come into contact when the tab pusher is displaced downward. A tab supply device comprising a bracket, wherein the contact is closed and the abnormal signal is output when the tab pusher and the earth bracket come into contact with each other.
[0009]
In this onset bright follow, when an abnormal posture tab from the stack is carried out, said tab pusher receives an abnormal posture tab said tab mounting portion, abnormal posture tab in step cutting the tabs one by one from the stack Detection of the occurrence of is performed. That is, in the stage before proceeding to the tab fixing process of the can lid forming press device from the tab pusher, by detecting the occurrence of an abnormal posture tab, the tab is clogged in the middle, the tab is not sent to the tab fixing process, It is easy to prevent or reduce the occurrence of defects such as being fixed to the can lid in a state where the front and back sides of the tab are inverted, and scrap marks generated on the can lid and leakage due to scrap biting.
[0011]
Further, in this onset bright, utilizing the difference in front and back and the direction of the shape of the tub, for example, such as the front and back and the direction of the shape is different position of the tab on the tab mounting portion provided projections, abnormal posture It is easy to detect the occurrence of an abnormal posture tab by having a mechanism that lifts the tab on the tab placement portion.
[0013]
Furthermore, in this onset bright, an abnormal posture tab is placed on the tab mounting portion, by a mechanism to float the tab on said tab mounting portion was lifted over said tab mounting portion wherein The tab will interfere between the guide member and the tab pusher. As a result, the tab pusher having an elastic displacement mechanism is displaced downward, the contact attached to the tab pusher is closed, and the abnormal signal is output. By detecting this abnormal signal, it becomes easy to detect the occurrence of an abnormal posture tab.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described based on specific examples. First, a tab supply device, a tab forming press device and a can lid forming press device related to the present invention will be described. FIG. 5 shows from a tab forming step to a tab fixing step with a can lid. The example shown here includes a tab forming press device 1, a tab stocker 2, a tab supply device 3, and a can lid forming press device 4.
[0015]
In the tab forming press apparatus 1 described above, the tabs are punched out by a dedicated die and press (not shown) and molded (step 1).
[0016]
A large number of tabs formed in this step are stored in the tab stocker 2 in a stacked state in which the front and back surfaces and directions are aligned by a predetermined means (step 2).
[0017]
The tabs transferred and stored from the tab stocker 2 to the stack of the tab supply device 3 are placed on the tab placement portion of the tab pusher provided in the tab supply device 3 where only one tab is placed and conveyed. Then, it is cut out one by one from the tab supply device 3 and sent to the can lid forming press device 4 by the reciprocating motion of the tab pusher (step 3).
[0018]
On the other hand, in the can lid forming press apparatus 4, the can lid to which the tab is fixed is subjected to forming processing such as punching, rivet forming, score line forming, etc. (steps 4 to 6).
[0019]
The tab fed from the tab supply device 3 to the can lid forming press device 4 is held by means such as vacuum suction on the upper die in the tab fixing process, and the can lid forming press device 4 performs rivet forming and score forming. After fitting the rivet hole formed in the tab to the rivet of the can lid, the top of the rivet is caulked and fixed to the can lid (step 7).
[0020]
Next, the tab supply device according to the present invention used in the above-described series of steps will be described. In the tab supply device according to the present invention, the tab pusher receives the abnormal posture tab at the tab mounting portion, and stacks the tab. It is configured to detect the occurrence of abnormal posture tabs at the stage of cutting out one by one. FIG. 1 is a schematic view showing an example of a tab supply device. The configuration of the tab supply device centered on the tab pusher 5 and the tab pusher 5 in a direction perpendicular to the arrangement direction of the tabs 7 in the stack 6. It is shown that the tab 7 is transported to the can lid forming press device by reciprocating. FIGS. 2 to 4 are schematic views showing the operation state of each part of the tab supply device when the abnormal posture tab is carried out of the stack 6.
[0021]
The above-described tab supply device is provided with a stack 6 for storing a large number of tabs 7 in a state where their postures are aligned. As shown in FIG. 1, the stack 6 opens downward, and a tab pusher 5 that reciprocates in the direction perpendicular to the stack 6 is disposed at the lower end side (tip side). The tab pusher 5 has a tab placement portion 8 formed on the top surface of the tip. The tab placement portion 8 is formed of a recess having a contour shape substantially similar to that of the tab 7, and is configured to place only one tab 7. Specifically, the tab placement portion 8 has an uneven shape in the depth direction aligned with the contour shape of the tab 7.
[0022]
The shape of the tab 7 is as shown in FIG. 4. The curling portion 9 formed by press molding on the outer peripheral portion, the rivet hole 10 fitted to the rivet portion of the can lid when fixed to the can lid, the can It comprises a finger hook portion 11 that becomes a portion to put a finger on when the lid is opened, and a hollow portion 12 formed on the back side of the finger hook portion 11 by the thickness of the curling portion 9. Here, the tab mounting portion 8 has the curling at a position corresponding to the position where the front and back surfaces of the tab 7 and the shapes of the directions are different and facing the recessed portion 12 formed on the back surface side of the tab 7. A protrusion 13 having a height lower than the thickness of the portion 9 is formed. Therefore, when the tab 7 is in a normal posture, the protrusion 13 is fitted into the indented portion 12, so that the tab 7 is placed on the tab placing portion 8 without being lifted.
[0023]
The tab pusher 5 is mounted in a cantilever manner on the guide roller 14 and is configured to reciprocate in the left-right direction in FIG. It is configured to be able to move. This configuration corresponds to a displacement mechanism for displacing the tab pusher 5 in the present invention downward. A ground bracket 15 is disposed below the tab pusher 5 with a slight gap. The ground bracket 15 is formed of a conductive material and forms a contact point with the tab pusher 5. A predetermined voltage is applied to the ground bracket 15 and the tab pusher 5, and a detector (not shown) for detecting current is provided in the circuit.
[0024]
As shown in an enlarged view in FIG. 2, the front edge of the stack 6 (the right end in FIG. 1) is formed in an inclined state in which the stack 6 retreats upward to the inside and advances downward to the outside. This portion is a guide member 16.
[0025]
On the other hand, at the front end portion (right side portion in FIG. 1) of the movable range of the tab pusher 5, the upper part of the tab fixing process of the can lid forming press device 4 that holds the tab 7 from the tab mounting portion 8 by vacuum suction. A mold 17 is provided.
[0026]
Next, the operation of the above-described tab supply device will be described. FIG. 2 shows a state in which the tab 7 is carried out from the stack 6 in a normal posture, in a stacked state in which the front and back sides and directions are aligned. The tab 7 accommodated in the stack 6 is placed so that only one tab 7 of the tab placement portion 8 provided in the tab pusher 5 is placed by the action of an elastic body such as gravity or a spring, for example. It moves to the position set to, and is mounted.
[0027]
At this time, since the tab 7 is in a normal posture, the projection 13 provided on the upper surface of the tab placement portion 8 does not interfere with the tab 7 as shown in FIG. 8, the tab 7 is not lifted upward. That is, the tab pusher 5 is not displaced downward, and the tab 7 is conveyed to the can lid forming press apparatus while the predetermined gap 18 is held on the lower side of the tab pusher 5.
[0028]
On the other hand, FIG. 3 shows a state when the tab 7 is carried out from the stack 6 in an abnormal posture. The abnormal posture tab 19 is a tab placement portion provided in the tab pusher 5 as described above. 8 is moved to a predetermined position and placed.
[0029]
However, since the tab is in an abnormal posture at this time, the protrusion 13 provided on the upper surface of the tab placement portion 8 interferes with the abnormal posture tab 19, and the abnormal posture tab 19 is lifted upward. Placed on the unit 8. When the tab pusher 5 moves forward, the abnormal posture tab 19 that floats upward interferes with the guide member 16 provided at the tip of the stack 6. If the tab pusher 5 further advances from there, the abnormal posture tab 19 is pushed down along the inclined surface of the guide member 16, and accordingly, the tab placement on which the abnormal posture tab 19 is placed. A force also acts on the portion 8 so as to be pushed down. As a result, the tab pusher 5 having a displacement mechanism that elastically displaces downward is displaced downward, and the abnormal posture tab 19 is moved to the lower side of the tab pusher 5 before being conveyed to the can lid forming press. The predetermined gap 18 that has been set disappears, and the lower surface of the tab pusher 5 that is disposed on the lower side of the tab pusher 5 makes contact with the earth bracket 15 that constitutes a contact point.
[0030]
As described above, when the abnormal posture tab 19 is carried out, due to the interference between the abnormal posture tab 19 and the guide member 16, the tab pusher 5 is displaced downward, the gap 18 disappears, and the contact is closed, When the contact is closed, a current flows. When the current is detected, a detector that outputs an abnormal signal is activated to detect an abnormal posture tab generated in the tab supply device.
[0031]
In the above specific example, as an abnormal posture tab detection means, an example is shown in which the contact that closes when the tab pusher is displaced downward is configured as an electrical contact, but this contact is the example described above. It is not limited to what is shown. For example, an optical sensor switch, a magnetic sensor switch, or a vacuum switch may be applied.
[0032]
In addition, the can lid targeted by the present invention is not limited to the steion tab type can lid shown above, and can be applied to a full-open can lid or the like whose opening is a full opening type. it can.
[0033]
【The invention's effect】
As described above, according to this onset bright, if the incorrectly-oriented tab is unloaded from the stack, the tab pusher receives the abnormal posture tab tab mounting portion, abnormal posture in step cutting the tabs one by one from the stack Detection of the occurrence of a tab is performed. That is, by detecting the occurrence of an abnormal posture tab before proceeding to the tab fixing process of the can lid forming press device from the tab pusher, the tab is clogged in the middle and the tab is not sent to the tab fixing process. It is possible to prevent or reduce the occurrence of defects such as being fixed to the can lid in a state where the front and back sides are reversed, scrap marks generated on the can lid, and leakage due to scrap biting.
[0034]
Further, according to this onset bright, such as by utilizing a difference in front and back and the direction of the shape of the tab, for example, the front and back and the direction of the shape is different position of the tab on the tab mounting portion provided projections, tabs By having a mechanism that floats on the tab placement portion, it is possible to detect the occurrence of abnormal posture tabs and prevent or reduce the occurrence of abnormalities in the tab fixing process and defective can lids.
[0035]
Further, according to this onset bright, the tab mounting abnormal posture tab portion is placed, by a mechanism to float on the tab mounting portion of the tab, a tab that has been lifted over the tab mounting portion Interference occurs between the guide member provided at the tip of the stack of the tab supply device and the tab pusher. As a result, the tab pusher having an elastic displacement mechanism is displaced downward, and the contact attached to the tab pusher is closed. An abnormal signal is output. By detecting this abnormal signal, it is possible to detect the occurrence of an abnormal posture tab and prevent or reduce the occurrence of an abnormality in the tab fixing process and a defect in the can lid.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of a tab supply device targeted by the present invention.
FIG. 2 is a diagram showing a state when a tab is carried out in a normal posture from a stack of a tab supply device as a target in the present invention.
FIG. 3 is a diagram showing a state when a tab is unloaded from the stack of the tab supply device targeted by the present invention.
FIG. 4 is a diagram showing protrusions provided on a tab placement portion of a tab supply device targeted by the present invention and the shape of the front and back of the tab.
FIG. 5 is a process diagram showing an example from a tab forming process to a tab fixing process with a can lid as a target in the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Tab molding press apparatus, 2 ... Tab stocker, 3 ... Tab supply apparatus, 4 ... Can lid molding press apparatus, 5 ... Tab pusher, 6 ... Stack, 7 ... Tab, 8 ... Tab mounting part, 9 ... Curling part , 10 ... Rivet hole, 11 ... Finger hooking part, 12 ... Recessed part, 13 ... Projection, 14 ... Guide roller, 15 ... Ground bracket, 16 ... Guide member, 17 ... Upper mold, 18 ... Crevice, 19 ... Abnormal posture tab.

Claims (2)

One of the above-mentioned items carried out of the stack is fixed to the rivet portion of the can lid, has a recessed portion on the back surface, and has a tab having different shapes for each of the front and back sides and directions. A tab provided with a tab placement portion for receiving a tab and provided with a tab pusher that reciprocates in the direction perpendicular to the arrangement direction of the tabs in the stack to cut out the tabs one by one from the stack. In the supply device,
It said tab mounting posture of the received tab portion is provided with a detection means to output an abnormality signal in case of different abnormal posture from the normal posture,
When the tab on the tab placement portion is in a normal posture, the detection means fits into the indented portion without lifting, and the tab on the tab placement portion is front and back and direction A projection formed on the tab placement portion of the tab pusher so as to interfere with the tab and cause the tab to float on the tab placement portion.
The stack is disposed above the tab pusher, and the front edge of the stack is formed on an inclined surface that is inclined upward and retracts to the inside of the stack and advances downward to the outside. When the tab is placed in a posture, the tab pusher is allowed to pass therethrough, and when the tab is placed in the abnormal posture and the tab and the protrusion interfere with each other, the tab is lifted up. A guide member that interferes with the inclined surface;
A displacement mechanism that elastically displaces the tab pusher downward when the tab and the inclined surface of the guide member interfere with each other;
A switch that closes the contact and outputs the abnormal signal when the tab pusher is displaced downward;
A tab feeding device characterized by comprising: The switch includes a ground bracket arranged with a gap below the tab pusher so as to come into contact when the tab pusher is displaced downward, and when the tab pusher contacts the ground bracket The tab supply device according to claim 1, wherein the contact is closed and the abnormality signal is output .

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