JPH0343138B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a label take-out device, and more particularly to a label take-out device that takes out labels one by one from a label magazine in which a large number of labels are stacked and stored.

``Prior Art'' Conventionally, label take-out devices generally include a rotary body that is rotatably provided, and a label magazine that is rotatably installed around the rotary body to pick up labels one by one from a label magazine that stores a large number of labels in a stack. It also includes a pick-up member for taking out.

The pick-up member is designed to hold the label in the label magazine using negative pressure or glue and pull out the label from the label magazine, but the label magazine holds the label on the front side in the direction of rotation of the rotating body. If the pick-up member has a claw or is provided on a rotary body and the label is brought into contact with the label instantaneously, the label retention by the pick-up member will be incomplete, so the label magazine At the same time, the pick-up member is rotated in the opposite direction to the rotation direction of the rotor to ensure a long contact time between the pick-up member and the label, or the label is further rotated in the direction of rotation of the rotor. The label is moved in the opposite direction to the rotational direction to disengage the label from the claw of the label magazine.

``Problems to be Solved by the Invention'' However, if the label magazine is made to be able to swing freely in synchronization with the rotation of the rotating body, the rotation angle of the pick-up member can be made smaller, so that the pick-up member Although it is relatively easy to control the rotation of the label magazine, it becomes difficult to replenish labels to the oscillating label magazine, and it becomes impossible to replenish labels especially in high-speed operation, so the labeler operation must be switched to low-speed operation each time. I had to.

On the other hand, it is known that the label magazine is fixed and the labels are taken out from the magazine only by rotating the pick-up member relative to the rotary body, but in this case, the label magazine must be oscillated. Since it is necessary to rotationally displace the pick-up member to a greater degree than in the case where the pick-up member is rotated, highly accurate rotational control of the pick-up member is required.

Conventionally, a cam mechanism has been used as a means for rotationally driving the pick-up member (Japanese Patent Publication No. 51-45960), but in order to control the rotation of the pick-up member with high precision using the cam mechanism, it is especially It is necessary to manufacture the device with high precision, and when actually assembling the device, the assembly position of each part and the cam curve itself must be corrected, which requires a lot of labor and time. This problem has become particularly noticeable when it is necessary to rotate the pick-up member to a large extent as described above, and as the speed of the label take-out device increases.

"Means for Solving the Problems" In view of such drawbacks, the present invention provides the above-mentioned label take-out device in which a first servo motor is linked to the rotating body, and a second servo motor is linked to the pick-up member. Further, an angle detector for detecting the rotation angle of the rotating body and a control device for inputting a signal from the angle detector are provided, and the control device controls the first servo motor to pick up the pickup member. When the pick-up member approaches the label of the label magazine, the rotational speed of the rotating body is reduced relative to the conveyance speed of the container, and when the pick-up member holds the label, the rotational speed of the rotary body is increased to synchronize with the conveyance speed of the container, Further, the second servo motor is controlled by the control device to rotationally displace the pick-up member in a direction opposite to the rotational direction of the rotating body when the pick-up member substantially contacts the label of the label magazine, and the pick-up member is rotated in a direction opposite to the rotational direction of the rotating body. After holding the label, the pick-up member is rotated in the opposite direction to return.

"Operation" According to the above configuration, the first servo motor that controls the rotation of the rotary body reduces the rotational speed of the rotary body relative to the conveyance speed of the container when the pick-up member approaches the label of the label magazine. The label can be held relatively easily by the member, and the label can be held smoothly and reliably during high-speed operation. In addition, the first servo motor increases the rotational speed of the rotating body once the pick-up member holds the label and synchronizes it with the conveyance speed of the container, so that the label held by the pick-up member can be smoothly fed to the container as in the conventional device. Can be pasted.

On the other hand, the second servo motor that controls the rotation of the pick-up member rotates and displaces the pick-up member in a direction opposite to the rotational direction of the rotating body when the pick-up member almost contacts the label of the label magazine. Since the contact time between the pick-up member and the label can be increased, the label can be held securely by the pick-up member.

The rotation speed and amount of rotation of the pick-up member can be adjusted extremely easily by the control device, so conventionally the rotation speed and amount of rotation of the pick-up member were adjusted by modifying the cam mechanism. The assembly work and adjustment work can be made significantly easier compared to the above.

In particular, for example, two label magazines may be prepared around the rotating body, each label magazine may contain different types of labels, and the pick-up member may selectively take out labels from one of the label magazines. In this case, when changing the label extraction from one label magazine to the other, it is only necessary to change the rotation control of the first and second servo motors by the control device. Compared to the case where the curve is changed, the changing work can be significantly simplified, and there is also the advantage that the configuration around the rotary table can be simplified since a cam mechanism is not required.

"Example" The present invention will be described below with reference to the illustrated example.
In FIG. 3, a label take-out device 1 according to the present invention takes out labels L one by one from a label magazine 2 that stores a large number of labels L in a stack, and delivers the taken-out labels L to a vacuum drum 3.
The label L delivered to the vacuum drum 3 is coated with glue on the outer peripheral surface side, that is, the back surface side, by the gumming unit 4 while being conveyed by the vacuum drum 3, and then conveyed by the conveyor 5. It is attached to the container 6 that has been prepared by the adhesive force of the glue.

The container 6 is held and rotated between the vacuum drum 3 and the pressure pad 7, and is subsequently held and rotated between the after roll pad 8 and the wiping belt 9. The label L attached to the outer peripheral surface of the container 6 from the vacuum drum 3 is rotated while the container 6 is held between the after roll pad 8 and the wiping belt 9. , completely adhered to the outer peripheral surface of the container 6.

As shown in FIG. 1, the label take-out device 1 includes a drive shaft 16 that is driven to rotate in synchronization with the vacuum drum 3 by a first servo motor 15, and a drive shaft 16 that is disposed parallel to the top and bottom of the drive shaft 16. The rotating body 19 is provided with rotary disks 17 and 18 which are installed and fixed, and in this embodiment, the rotating body 19 is
Pick-up members 20, which are disposed parallel to the drive shaft 16, are rotatably supported at three equally spaced positions on the outer periphery of the drive shaft.

The first servo motor 15 is electrically connected to a control device 21 shown in FIG. 2, and this control device 21 receives a signal from an angle detector 22 that detects the rotation angle of the vacuum drum 3. The rotation of the first servo motor 15 is controlled to rotate the rotating body 19 in synchronization with the vacuum drum 3.

Further, below each pick-up member 20, there is a bracket 23 provided on the lower surface of the lower rotary disk 18.
A second servo motor 24 is attached to each of the pick-up rollers 20 through the second servo motor 24, and each second servo motor 24 is linked to each of the pick-up rollers 20. The second servo motors 24 are electrically connected to the above-mentioned control device 21 via rotary joints (not shown).
each second servo motor 2 receives a signal from an angle detector 25 that detects the rotation angle of the rotating body 19.
It is possible to control the rotation of each of the four.

Next, each of the pick-up members 20 has a plurality of vacuum passages 30 formed in the radial direction in order to suck and hold the labels L, and one end of each vacuum passage 30 is connected to the arcuate suction surface of the pick-up member 20. It is opened at 20a. The other end of each vacuum passage 30 includes an axial passage 31 formed in the shaft portion of the pick-up member 20 and a radial passage 3 formed in the upper part of the pick-up member 20.
2, the outer peripheral surface of the pick-up member 20,
An upper rotating disk 17 that rotatably penetrates this
It communicates with the inner peripheral surface of the hole formed in the hole and the gap 33 formed therebetween. This gap 33 is kept airtight by a pair of upper and lower seal members 34, and furthermore, the gap 33 is communicated with a radial passage 35 and an axial passage 36 formed in the rotating disk 17, and this axial passage 36 is The upper surface of the rotating disk 17 is opened.

As shown in FIGS. 1 and 2, the upper surface of the rotating disk 17 is provided with a support plate 38 having an arcuate groove 37 formed on the lower surface thereof, which overlaps a part of the rotation locus of the axial passage 36. The drive shaft 16 is placed in sliding contact with the upper surface of the rotating disk 17 by a spring 39 loaded between the support plate 38 and the head of the drive shaft 16 while the support plate 38 is prevented from rotating. . By communicating the arcuate groove 37 with a negative pressure source via a conduit (not shown), the negative pressure of the negative pressure source is transferred to the vacuum passage 30 only when the axial passage 36 communicates with the arcuate groove 37. We are making it possible to introduce it. In addition, an air hole 40 is formed in the support plate 38 at a position slightly forward of the arcuate groove 37 in the rotational direction of the rotating body 19 so as to overlap and communicate with the axial passage 36 to introduce air into the vacuum passage 30. are doing.

In the label take-out device 1 having the above configuration, the control device 21 receives signals from the angle detectors 22 and 25, and controls the vacuum drum 3 and the rotating body 1.
The rotation angle positions of 9 are monitored respectively, and the 4th rotation angle position is monitored.
As shown in the figure, when the pick-up member 20 approaches the label magazine 2 due to the clockwise rotation of the rotating body 19, its suction surface 20a is directed outward in the radial direction of the rotating disk 17. In this state, when the axial passage 36 overlaps the arcuate groove 37, negative pressure is introduced into the vacuum passage 30.

The pick-up member 20 is the label magazine 2
When approaching, at least during high-speed operation, the control device 21 controls the first servo motor 15 to temporarily de-synchronize the rotating body 19 and the vacuum drum 3 to reduce the rotational speed of the rotating body 19. . When the suction surface 20a of the pick-up member 20, which has become relatively slow due to this, comes into contact with the front end of the label L in the label magazine 2 in the rotational direction, the label L is moved to the suction surface 20a by negative pressure.
It is adsorbed and held at 0a (Fig. 4a).

When the suction surface 20a comes into contact with the label L, at the same time, the second servo motor 24 of the control device 21 causes the pickup member 20 to rotate counterclockwise in FIG. 4 at a faster rotational speed of the rotary disk 17. As a result, the contact time between the adsorption surface 20a and the label L becomes relatively long, and reliable adsorption is performed, and the tip of the label L adsorbed on the pick-up member 20 is moved back, so that the leading edge of the tip is It is removed from the claw 2a of the label magazine 2, and the rear end of the tip is pulled out from the label magazine 2 (FIGS. 4b and 4c).

When the leading end of the label L is pulled out from the label magazine 2 in this manner, the pick-up member 20 is rotated clockwise in FIG. The label L is directed outward in the radial direction, and the entire tip of the label L is pulled out from the label magazine 2 (FIGS. 4 d to 4 f).

When the entire leading end of the label L is pulled out from the label magazine 2, the control device 21 increases the rotational speed of the rotating body 19 and synchronizes the rotating body 19 with the vacuum drum 3 again. When the tip of the label L approaches the vacuum drum 3, the axial passage 36 disengages from the arcuate groove 37, cutting off communication between the vacuum passage 30 and the negative pressure source, and then the axial passage 36 When communicating with the atmospheric hole 40, the vacuum passage 30 is communicated with the atmosphere, so that the adsorption and holding of the label L is released. At the same time, the tip of the label L is attracted and held by the negative pressure of the vacuum drum 3, and as the vacuum drum 3 rotates, the label L is completely transferred from the pick-up member 20 to the vacuum drum 3. It is delivered.

As mentioned above, the two label magazines are arranged at different positions in the circumferential direction of the rotating body 19, so that each label magazine can store different types of labels, so that either one of the label magazines can be stored. If selective use is possible, it is only necessary to change the control program of the control device 21 to suit each case, and the modification work becomes much easier than in the past.

Further, in the above embodiment, negative pressure is used to take out the label L from the label magazine 2, but it is also possible to apply glue to the pick-up member and use the adhesive force to take out the label L. As is conventionally known, the pick-up member is composed of an arc-shaped member, and when one end of the pick-up member comes into contact with one end of the label of the label magazine, the pick-up member is rotated in the rotational direction of the rotating body while keeping the pick-up member in contact with the label. rotational displacement in the opposite direction to apply the label to the pick-up member and thereby apply glue to the label. Then, the pick-up member holds and takes out the label from the label magazine, and then, when the other end of the label of the pick-up member is brought into contact with the vacuum drum that rotates in a predetermined direction, the pick-up member is rotated in the opposite direction. The label held on the pick-up member may be transferred to the vacuum drum while returning the label.

Furthermore, it goes without saying that a stepping motor may be used as the servo motor of the present invention.

"Effects of the Invention" As described above, according to the present invention, labels can be reliably taken out from the label magazine even during high-speed operation, and the assembly and adjustment work of the label take-out device can be performed using a conventional cam mechanism. The servo control system can be significantly simplified compared to the one that uses Since all you have to do is change the rotation control of the motor, the change work can be significantly simplified, and since a cam mechanism is no longer required, the configuration around the rotary table can be simplified, among other effects. .

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of essential parts showing one embodiment of the present invention, FIG. 2 is a plan view, FIG. 3 is a plan view of the entire labeler, and FIGS. It is a process diagram showing the state in which the label L is taken out. 1... Label take-out device, 2... Label magazine, 3... Vacuum drum, 2a... Claw, 4...
... Gumming unit, 6... Container, 15, 24...
... Servo motor, 19 ... Rotating body, 20 ... Pickup member, 21 ... Control device, 22, 25 ...
...Angle detector, L...Label.

Claims (1)

[Scope of Claims] 1. A rotating body that is driven to rotate in synchronization with a conveying means for conveying containers to which labels are attached, and a rotating body that is rotatably provided around this rotating body and that stores a large number of labels in a stacked manner. A label pick-up device is provided with a pick-up member for picking up labels one by one from a label magazine that has been loaded. an angle detector for detecting the rotation angle of the camera, and a control device for inputting a signal from the angle detector, and the control device controls the first servo motor so that the pick-up member is attached to the label of the label magazine. When they approach, the rotational speed of the rotary body is reduced relative to the conveyance speed of the container, and when the pick-up member holds the label, the rotational speed of the rotary body is increased to synchronize with the conveyance speed of the container; The second servo motor is controlled to rotationally displace the pick-up member in a direction opposite to the rotating direction of the rotating body when the pick-up member almost contacts the label of the label magazine, and when the pick-up member holds the label, the pick-up member is A label take-out device characterized by rotating and returning in the opposite direction.