JP7744571B2 - Labella - Google Patents

Description

The present invention relates to a labeler, and more specifically to a labeler equipped with a rotary cutter that cuts continuous strip-shaped roll labels to a predetermined length.

BACKGROUND ART Conventionally, a labeler is known that attaches labels to the outer peripheral surface of a container such as a PET bottle by cutting a continuous strip-shaped roll label to a predetermined length using a label cutting means and then attaching the cut label to the container.
Furthermore, a known label cutting means used in the labeler is a rotary cutter that includes a rotatable cutter roller, a cutting blade fixed to protrude from the outer peripheral surface of the cutter roller, and a backup roller arranged on the opposite side of the cutter roller, sandwiching the roll label between them (Patent Document 1).
In the labeler of Patent Document 1, the roll label is passed between the cutter roller and the backup roller, and the cutting blade is pressed against the backup roller to cut the roll label.
On the other hand, when a labeler is operated for a long period of time, the sharpness of the cutting blade deteriorates due to changes over time, making it impossible to perform the cutting operation smoothly.Therefore, a labeler is known that diagnoses the operating condition by diagnosing the sharpness of the cutting blade that cuts the roll label (Patent Document 2).

Japanese Patent Application Laid-Open No. 2004-50372 Patent No. 4583632

The labeler in Patent Document 2 checks the operating status to prevent operational problems from occurring. For example, if it is diagnosed that the cutting blade is not sharp enough, it will notify the user on the display means and, if necessary, will stop the device.
However, in order to improve the sharpness of the cutting blade, the labeler must be stopped and an operator must perform tasks such as adjusting or replacing the cutting blade, which creates the problem of reducing the operating rate of the entire processing system for processing containers.
In view of these problems, the present invention provides a labeler that allows the labeler to continue to be used temporarily even if the sharpness of the cutting blade deteriorates, thereby preventing a decrease in the operating rate of the processing system as much as possible.

In view of these problems, the present invention provides a labeler that includes a roll label supply means for supplying continuous strip-shaped roll labels, a rotatable cutter roller, a cutting blade that protrudes from the outer circumferential surface of the cutter roller and cuts the roll labels supplied by the roll label supply means, and a backup roller that is provided on the opposite side of the cutter roller with the roll labels sandwiched therebetween,
the label conveying device comprises a label conveying means for conveying the label cut by the cutting blade, a label determining means for determining the cutting condition of the cutting blade based on the deviation between a reference position set in the label conveying means and the conveying position of the label conveyed by the label conveying means, a pressing force adjusting means for adjusting the pressing force between the cutter roller and the backup roller , and a notification means for issuing a notification to prompt replacement or adjustment of the cutting blade or the backup roller ,
When the label determination means determines that the sharpness of the cutting blade has deteriorated, the notification means issues the notification, and the pressing force adjustment means brings the central axis of the backup roller closer to the cutter roller, thereby increasing the pressing force of the backup roller against the cutter roller and continuing the cutting operation of the roll label .

According to the above invention, when the label determination means determines that the sharpness of the cutting blade has decreased, the notification means issues a notification urging the user to replace or adjust the cutting blade or backup roller, and the pressing force adjustment means increases the pressing force between the backup roller and the rotary cutter, thereby temporarily restoring the sharpness of the cutting blade and allowing the user to continue cutting the roll label .
This allows the cutting blade to maintain its sharpness and the labeler to continue operating, so that the cutting blade can be adjusted or replaced only after processing of all containers has been completed and the labeler has been stopped, preventing a decrease in the operating rate of the processing system.

FIG. 2 is a plan view of the labeler according to the present embodiment. Enlarged plan view of the rotary cutter Front view of rotary cutter FIG. 10 is a diagram illustrating the operation of the pressure adjusting means. A diagram for explaining a label determination means

The illustrated embodiment will now be described. FIG. 1 shows a labeler 2 that affixes labels made of a resin film to the outer periphery of containers such as PET bottles, and the labeler 2 forms part of a container processing system that fills containers with beverages, etc.
The labeler 2 is provided along the container conveying means 3 that conveys the containers, and is composed of a roll label supplying means 4 that supplies a continuous strip of roll label 1A, a rotary cutter 5 that cuts the roll label 1A to a predetermined length, a label determining means 6 that inspects the conveying position of the cut label, and a label applying means 7 that applies the label to the container conveyed by the container conveying means 3, and these are controlled by a control means not shown.

The container transport means 3 is composed of a supply conveyor 11 for transporting containers, a disk-shaped inlet wheel 12, a loading wheel 13, and an outlet wheel 14, each of which has a container holding means on its outer periphery, and a discharge conveyor 15 for discharging containers to a subsequent process.
The supply conveyor 11 is provided with an infeed screw 11 a, and the containers transported by the supply conveyor 11 are separated at predetermined intervals by the infeed screw 11 a and then delivered to an inlet wheel 12 .
When the wheels are close to each other, the container holding means are adapted to transfer containers between them, and the container holding means of the mounting wheel 13 is adapted to rotate the containers it holds.
With this configuration, at the label application position on the mounting wheel 13, the label application means 7 applies a strip-shaped label to the outer peripheral surface of the container rotated by the container holding means.
The containers with the labels attached thereto are transferred from the attachment wheel 13 to the exit wheel 14 and then discharged from the discharge conveyor 15.

The roll label supply means 4 includes a roll stand (not shown) on which a strip-shaped roll label 1A having a predetermined width is wound, a feed roller 4a that transports the roll label 1A, and a plurality of guide rollers 4b that guide the roll label 1A toward the rotary cutter 5.
Register marks and cut marks are printed on the roll label 1A in accordance with the cutting position, and the roll label supplying means 4 is provided with a detecting means (not shown) for detecting the register marks on the roll label 1A.
The detection means transmits the rotation angle position of the detected register mark to a control means (not shown), and when the control means recognizes the rotation angle position of the detected register mark of the roll label 1A, it adjusts the speed of the feed roller 4a and feeds the roll label 1A to the rotary cutter 5 so that the roll label 1A is cut at a position based on this register mark.

Figures 2 to 4 show the rotary cutter 5, which comprises a rotatably mounted cylindrical cutter roller 21, a cutting blade 22 protruding from the outer circumferential surface of the cutter roller 21, and a rotatably mounted cylindrical backup roller 23 located on the opposite side of the cutter roller 21 across the roll label 1A, with the cutter roller 21 and backup roller 23 being held by a box-shaped base frame 24 shown in Figure 3.
The cutter roller 21 and backup roller 23 are kept pressed against each other with the required pressure by a pressure adjustment means 25, and when the roll label 1A is positioned between the cutter roller 21 and the backup roller 23, the cutting blade 22 protruding from the outer periphery of the rotor 21 is pressed against the backup roller 23, cutting the roll label 1A.

As shown in FIG. 3, the drive shafts 26 provided above and below the cutter roller 21 are rotatably supported on the base frame 24 via bearings, and the lower drive shaft 26 in the figure protrudes below the base frame 24 and is driven by a motor 27 controlled by control means.
The cutter roller 21 is provided with a gear 29, which meshes with a gear 30 provided on the backup roller 23 as will be described later, so that the cutter roller 21 and the backup roller 23 rotate in synchronization.
As shown in FIG. 2, a slit 21a is formed in the cutter roller 21 at a position offset from the center, and the cutting blade 22 is arranged to be movable back and forth from the inside to the outside of the cutter roller 21 along the slit 21a.
The cutting blade 22 in this embodiment is formed in a straight line, so that the edge of the label 1 is cut perpendicular to the conveying direction as shown in FIG.
In addition, the tip of the cutting blade 22 is fixed so as to protrude slightly from the outer peripheral surface of the cutter roller 21, and the amount of protrusion of this cutting blade 22 can be adjusted by a holding means (not shown) provided on the cutter roller 21 depending on the thickness of the label 1, etc.

The backup roller 23 has a cylindrical outer shape, and the cutting blade 22 is pressed against the outer circumferential surface thereof to cut the roll label 1A.
The outer diameter of the backup roller 23 is set larger than that of the cutter roller 21, so that when the cutter roller 21 and the backup roller 23 rotate synchronously, the pressing position of the cutting blade 22 against the backup roller 23 is different each time.
A holding shaft 28 held by the base frame 24 passes through the backup roller 23, and a gear 30 that meshes with a gear 29 provided on the cutter roller 21 is provided at the lower end of the backup roller 23.
The holding shaft 28 is composed of a swing shaft 28a rotatably supported on the base frame 24 via a bearing, and an eccentric shaft 28b that rotatably supports the backup roller 23 and is provided at a position where its center is offset from the swing shaft 28a.
With this configuration, when the oscillating shaft 28a of the holding shaft 28 rotates around its central axis, the eccentric shaft 28b oscillates around the central axis of the oscillating shaft 28a, and the backup roller 23 can revolve around the oscillating shaft 28a.

The pressing force adjusting means 25 has an arm 25a provided at the tip of the holding shaft 28 and an air cylinder 25b fixed to the upper part of the base frame 24, and the air cylinder 25b is controlled by the control means 33 described later.
FIG. 4 is a diagram for explaining the operation of the pressing force adjusting means 25, and the dimensions are exaggerated for the purpose of explanation.
The base of the arm 25a is fixed to the swing shaft 28a of the holding shaft 28, and is adapted to rotate around the rotation axis of the swing shaft 28a. The tip of the arm 25a is connected to the tip of the cylinder rod of the air cylinder 25b.
In the plan view shown in Figure 4, the tip of the arm 25a extends to the opposite side of the eccentric shaft 28b across the swing shaft 28a of the holding shaft 28, and when the air cylinder 25b moves the cylinder rod forward from the state in which it has retracted as shown in Figure 4(a) to the state in which it has moved forward as shown in Figure 4(b), the central axis of the backup roller 23 swings around the swing shaft 28a and approaches the cutter roller 21.
In Figure 4, when the state of Figure 4(a) is changed to the state of Figure 4(b), the swing arm 25a swings by about 45 degrees, but at this time the actual movement amount of the central axis of the backup roller 23 is about 1 to 2 mm, and the meshing state of the gears 30 and 29 provided on the cutter roller 21 and backup roller 23 is maintained.

In this embodiment, the state shown in FIG. 4(a) is the normal operating state, in which the backup roller 23 is pressed against the cutter roller 21 with a standard pressing force.
In contrast, the state shown in Figure 4(b) in which the cylinder rod is advanced is a pressurized state, and the central axis of the backup roller 23 approaches the cutter roller 21, resulting in a high pressing force.
In this way, by increasing the pressure with which the backup roller 23 presses against the cutter roller 21 using the pressure adjustment means 25, the pressure with which the cutting blade 22 protruding from the cutter roller 21 presses against the backup roller 23 increases, and the cutting performance of the cutting blade 22 is improved.

The label determination means 6 is provided downstream of the label cutting means 5 and comprises a rotatable transfer drum 31 as a label conveying means, an imaging means 32 provided adjacent to the transfer drum 31, and a pressure adjustment means control means 33 (hereinafter simply referred to as the control means 33) that controls the pressure adjustment means 25 based on the image captured by the imaging means 32.
The transfer drum 31 is provided at a position adjacent to the backup roller 23, and the label 1 is transferred from the backup roller 23 to the transfer drum 31 at a position close to the backup roller 23.
The transfer drum 31 has a cylindrical outer shape and is rotated by a driving means (not shown), and its outer surface is provided with a suction means (not shown) for adsorbing and holding the labels 1 cut by the rotary cutter 5.
Figure 5 shows a planar development of the outer circumferential surface of the transfer drum 31, showing the state in which the label 1 moves from the right to the left as the transfer drum 31 rotates, with the backup roller 23 of the rotary cutter 5 located on the right side of the figure.
A plurality of cut labels 1 can be adsorbed onto the outer peripheral surface of the transfer drum 31, and the speed at which the transfer drum 31 conveys the labels 1 is slightly faster than the speed at which the feed roller 4a conveys the labels 1 so that a gap is formed between the labels 1 adsorbed and held on the transfer drum 31.

In this embodiment, reference marks 34 are provided on the outer peripheral surface of the transfer drum 31 as reference positions in accordance with the conveying position of the cut label 1, and the reference marks 34 in this embodiment are set above and below the label 1. Note that the reference marks 34 may also be set either above or below the label 1.
The imaging means 32 operates in synchronization with the rotation of the transfer drum 31 to photograph the vicinity of the reference mark 34 on the transfer drum 31 .
The control means 33 constitutes part of the control means for controlling the labeler 2, and performs image processing of the image captured by the imaging means 32, as well as recognizing the position of the rear end of the label 1 adsorbed and held on the transfer drum 31 relative to the line connecting the reference marks 34.
If the reference mark 34 is set either above or below the label 1, the position of the rear end of the label 1 can be recognized from the coordinates of the set reference mark 34.
The label 1 on the right side of FIG. 5 shows a state in which the rotary cutter 5 has properly cut the roll label 1A, and the conveying position of the label 1 coincides with the reference position set on the transfer drum 31.
Specifically, the rear end of the label 1 transferred from the backup roller 23 to the transfer drum 31 is positioned on a straight line connecting the reference marks 34 .

On the other hand, the label 1 on the left side of Figure 5 shows a state in which the roll label 1A has not been properly cut by the rotary cutter 5, and the conveying position of the label 1 is shifted from the reference position on the transfer drum 31.
Specifically, the rear end of the label 1 is shifted rearward from the straight line connecting the reference marks 34 .
Here, the cause of the deviation of the conveying position of the label 1 from the reference position is a decrease in the sharpness of the cutting blade 22 of the rotary cutter 5.
For example, if the cutting ability of the cutting blade 22 deteriorates due to aging, part of the roll label 1A will remain uncut by the cutting blade 22, and the label 1 transferred to the transfer drum 31 will be pulled backward.
The deterioration of the cutting edge 22 may be caused not only by the deterioration of the cutting edge 22 itself, but also by the deterioration of the backup roller 23 against which the cutting edge 22 is pressed due to dents or scratches.
As a result, as shown on the left side of Figure 5, the rear end of the label 1 after cutting may shift backward from the straight line connecting the reference marks 34, or the label 1 may tilt from the straight line connecting the reference marks 34.
If the conveying position of the label 1 deviates significantly from the reference position in this way, when glue is applied to the label 1 by the glue application means 42, the glue will adhere to the application drum described below, causing poor application of the label 1.

Therefore, in the labeler 2 of this embodiment, an adjustable range is set up to a predetermined distance from the reference mark 34 as the range of deviation that will cause poor application of the label 1. An adjustable range may also be set for the angle formed by the rear end of the label 1 and a line connecting the reference mark 34 and the reference mark 34.
If the deviation exceeds the adjustable range, the labeler 2 is stopped. However, since the sharpness of the cutting blade 22 generally deteriorates gradually, the deviation will not suddenly exceed the adjustable range due to deterioration of the cutting blade 22 over time.
Therefore, in this embodiment, if the amount of deviation is within the adjustable range, the labeler 2 is allowed to continue operating without being brought to an emergency stop.
The control means 33 measures the amount of misalignment for multiple labels 1, and if the amount of misalignment is within the above-mentioned adjustable range, it calculates the average value of the amount of misalignment, the standard deviation of the amount of misalignment, and the frequency of occurrence of the misalignment, and if one or more of these values exceed a predetermined value, it determines that the sharpness of the cutting blade 22 has deteriorated.

Then, when it is determined that the sharpness of the cutting blade 22 has deteriorated, the control means 33 further controls the pressing force adjustment means 25 of the rotary cutter 5, and operates the air cylinder 25b to change from the state of Figure 4(a) to the state of Figure 4(b).
This brings the central axis of the backup roller 23 closer to the cutter roller 21, increasing the pressing force between the cutter roller 21 and the backup roller 23, and increasing the pressing pressure of the cutting blade 22 against the backup roller 23, temporarily restoring the sharpness of the cutting blade 22.
As a result, there will be no cutting defects in the label 1 that is subsequently cut by the rotary cutter 5, and the position of the rear end of the label 1 transported by the transfer drum 31 will approach the reference mark 34, eliminating any misalignment in the transport position of the label 1.

The label application means 7 is provided downstream of the label determination means 6 and is composed of a rotatable application drum 41 and a glue application means 42 provided adjacent to the application drum 41.
The joining drum 41 has a cylindrical outer shape, is driven to rotate by a driving means (not shown), and is provided with a suction means (not shown) on its outer circumferential surface for suction-holding the label 1 .
The application drum 41 is provided at a position adjacent to the transfer drum 31 of the label determination means 6, and the label 1 is transferred from the transfer drum 31 to the application drum 41 at a position close to the transfer drum 31.
Furthermore, the outer peripheral surface of the attachment drum 41 is positioned to match the position of the outer peripheral surface of the container transported by the attachment wheel 13 of the container transporting means 3, and the label 1 is attached to the outer periphery of the rotating container by the container holding means of the attachment wheel 13.
The glue application means 42 is configured to apply hot melt to the surface of the label 1 transported by the pasting drum 41, and is configured to discharge the hot melt in synchronization with the rotation of the pasting drum 41.

The operation of the labeler 2 having the above-described configuration will be described below. First, the roll label supplying means 4 supplies the continuous, band-like roll label 1A to the rotary cutter 5.
In the rotary cutter 5, a roll label 1A is supplied between the cutter roller 21 and the backup roller 23, and as the cutter roller 21 and the backup roller 23 rotate synchronously, the roll label 1A is cut by the cutting blade 22 provided on the cutter roller 21.
At this time, the pressing force between the cutter roller 21 and the backup roller 23 is maintained in a normal operating state by the pressing force adjustment means 25, and the cutting blade 22 is pressed against the backup roller 23, thereby cutting the roll label 1A.
The cut label 1 is then transferred to the transfer drum 31, where an image taken by the imaging means 32 is used to measure the amount of deviation between the conveying position of the label 1 and a reference position set on the transfer drum 31.
Here, when the rear end of the label 1 coincides with the position of the reference mark 34, as in the case of the label 1 on the left side of FIG. 5, the control means 33 determines that the cutting of this label 1 has been performed satisfactorily.
Thereafter, the label 1 is delivered to the label sticking means 7, and while being conveyed by the sticking drum 41, hot melt is applied to a predetermined position of the label 1 by glue applying means 42.
Next, when the label 1 is attached to the container being transported by the container transport means 3, the container is discharged from the discharge conveyor 15 of the container transport means 3.

Next, an operation will be described when the sharpness of the cutting blade 22 of the rotary cutter 5 deteriorates during operation of the processing system.
When the sharpness of the cutting blade 22 deteriorates, the rear end of the label 1 being transported by the transfer drum 31 will shift backward from the reference position where the reference mark 34 is provided, or will be tilted from the reference position, as shown in the label 1 on the right side of Figure 5.
The imaging means 32 constituting the label determination means 6 photographs the label 1 being transported by the transfer drum 31, and the control means 33 measures the difference between the rear end of the label 1 and the position of the reference mark 34 by image processing, and recognizes this difference as the amount of deviation.
Here, if for some reason the amount of deviation exceeds the adjustable range described above, or if the tilt of the rear end of the label 1 is large, the control means will make an emergency stop of the labeler 2 to prevent poor application of the label 1.
On the other hand, if the amount of deviation is within the adjustable range, the control means 33 measures the amount of deviation for the labels 1 being continuously conveyed, calculates the average amount of deviation within a specified time period or for a specified number of labels, the standard deviation of the amount of deviation, and the frequency of occurrence of deviation, and if one or more of these values exceed a specified value, it determines that the sharpness of the cutting blade 22 has deteriorated.
The control means uses an operation terminal or the like as a notification means to notify the operator that the sharpness of the rotary cutter 5 has deteriorated and that the cutting blade 22 and the backup roller 23 need to be adjusted or replaced. This notifies the operator of wear and deterioration of the cutting blade 22 and the backup roller 23 of the rotary cutter 5, enabling predictive maintenance to be performed.

Next, the control means 33 controls the pressing force adjusting means 25 of the rotary cutter 5 to bring it into the pressurized state shown in FIG. 4(a) to FIG. 4(b), thereby increasing the pressing force of the backup roller 23 on the cutting blade 22.
As a result, the pressing pressure of the cutting blade 22 provided on the cutter roller 21 against the backup roller 23 increases, and the apparent sharpness of the cutting blade 22 is temporarily restored.
As a result, for the labels 1 to be cut thereafter, the positional deviation of the trailing end of the label 1 from the reference mark 34 is eliminated.
The pressure adjusting means 25 maintains the pressurized state until the processing of the containers being processed in the container processing system is completed as scheduled, and the labeler 2 continues to attach labels 1 to the containers being transported by the container transporting means 3.
Furthermore, when the pressure adjusting means 25 performs an adjustment, the control means uses an operation terminal or the like as a notification means to notify the user that the pressure adjusting means 25 has performed an adjustment.
After the container processing system has finished processing a specified number of containers, an operator adjusts the cutting blade 22 or replaces the cutting blade 22 or the backup roller 23 .

In this way, according to the labeler 2 of this embodiment, when the label determination means 6 determines that the cutting performance of the cutting blade 22 provided on the rotary cutter 5 has decreased, the pressing force adjustment means 25 increases the pressing force of the backup roller 23 on the rotary cutter 21, thereby maintaining the cutting performance of the cutting blade 22.
This allows, for example, a container processing system to continue cutting the roll labels 1A without stopping the labeler 2 until the specified number of containers have been processed, and only after all containers have been processed can the cutting blade 22 be replaced or adjusted. This prevents a drop in the operating rate of the labeler 2, and ultimately the operating rate of the entire container processing system.

In the above embodiment, the pressing force adjusting means 25 for increasing the pressing pressure of the cutting blade 22 against the backup roller 23 is configured to increase the pressing force between the cutter roller 21 and the backup roller 23, but other methods may also be used to increase the pressing force of the backup roller 23 against the cutting blade 22.
For example, an actuator for moving the cutting blade 22 may be provided inside the cutter roller 21, and when the label determination means 6 determines that the cutting ability of the cutting blade 22 has decreased, the control means may control the actuator to move the cutting blade 22 forward, thereby increasing the amount of protrusion from the rotor 21.
In the above embodiment, the backup roller 23 is oscillated to approach the cutter roller 21, and the air cylinder 25b is used as the driving source, but it may also be driven by an actuator or a servo motor.
Furthermore, in order to increase the pressing force between the cutter roller 21 and the backup roller 23, it is possible to use a configuration other than the configuration in which the backup roller 23 is swung to approach the cutter roller 21.
In the above embodiment, as shown in FIGS. 4(a) and 4(b), the pressing force between the cutter roller 21 and the backup roller 23 is adjusted in two stages: a normal operating state and a pressurized state. However, by setting the operation of the air cylinder 25b to multiple stages, it is also possible to finely control the adjustment of the pressing force.
In the above embodiment, a reference mark 34 is provided on the outer peripheral surface of the transfer drum 31, and the position of the reference mark 34 is set as the reference position, but the reference position on the transfer drum 31 may also be set by a rotary encoder.
Furthermore, in the above embodiment, the difference between the rear end of the label 1 and the position of the reference mark 34 is measured and this difference is recognized as the amount of deviation, but it is also possible to measure the difference between the front end of the label 1 and the position of the reference mark 34 and recognize this difference as the amount of deviation.

REFERENCE SIGNS LIST 1 Label 1A Roll label 2 Labeller 5 Rotary cutter 6 Label determination means 7 Label application means 21 Cutter roller 22 Cutting blade 23 Backup roller 25 Pressing force adjustment means 31 Transfer drum (label conveying means) 32 Imaging means 33 Pressing force adjustment means control means 34 Reference mark

Claims (3)

A labeler comprising: a roll label supply means for supplying a continuous strip-shaped roll label; a rotatably mounted cutter roller; a cutting blade provided to protrude from the outer peripheral surface of the cutter roller and for cutting the roll label supplied by the roll label supply means; and a backup roller provided on the opposite side of the cutter roller with the roll label sandwiched therebetween,
the label conveying device comprises a label conveying means for conveying the label cut by the cutting blade, a label determining means for determining the cutting condition of the cutting blade based on the deviation between a reference position set in the label conveying means and the conveying position of the label conveyed by the label conveying means, a pressing force adjusting means for adjusting the pressing force between the cutter roller and the backup roller , and a notification means for issuing a notification to prompt replacement or adjustment of the cutting blade or the backup roller ,
When the label determination means determines that the sharpness of the cutting blade has decreased, the notification means issues the notification, and the pressing force adjustment means moves the center axis of the backup roller closer to the cutter roller, thereby increasing the pressing force of the backup roller against the cutter roller and continuing the cutting operation of the roll label . The label determination means includes a label detection means for detecting a conveying position of the label conveyed by the label conveying means,
The labeler according to claim 1, characterized in that the label determination means determines that the sharpness of the cutting blade has deteriorated when one or more of the average amount of deviation and the standard deviation of the amount of deviation for multiple labels measured by the label detection means exceed a predetermined value. The label conveying means has a transfer drum that adsorbs and holds the label on its outer peripheral surface and conveys it, and a reference mark is provided on the outer peripheral surface of the transfer drum as the reference position,
3. The labeler according to claim 2, wherein the label determination means recognizes the difference between the trailing edge of the label detected by the label detection means and the position of the reference mark as the amount of deviation.