JPH0872840A - Heating controller of heat-sensitive label - Google Patents

Abstract

PURPOSE: To increase the control accuracy by reducing the mass of movable parts executing a heating control and improve the control accuracy so as to always obtain the good heated condition of the heat-sensitive label. CONSTITUTION: A heating device of heat-sensitive labels supplying hot air from a blowing outlet 7 to the heat-sensitive labels 6 on an adhesion drum 2, us provided with a revolutional detector 12 counting the revolution number of the adhesion drum, a temperature detector 13 measuring the surface temperature of the adhesion drum and a controller controlling the hot air condition from the blowing outlet, in order to control the hot air condition from the blowing outlet through the controller on the basis of the detected signals from the revolution number detector and the temperature detector. As a concrete example of the control means, the delivery volume of blower 10, the calorific value of heat source 9, or an opening/closing valve installed in the downstream of the heat source, etc., are controlled. A bypass way of the heat source may be formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat control device for a heat sensitive label used in a labeler for sticking a label on the surface of an article such as a container. More specifically, the present invention relates to a heat-sensitive label heating control device in which a heat source is provided on the downstream side of a blower and the heat-sensitive label adsorbed on a sticking drum is heated by hot air blown out from the air outlet.

[0002]

2. Description of the Related Art Conventionally, as heating control means for heating a heat-sensitive label with this type of hot air, the heating state is controlled by moving the hot-air generating means itself back and forth to adjust the distance from the heat-sensitive label. Is known (Patent Fairness 5
No. 24021).

[0003]

By the way, the above-mentioned conventional heating control means performs heating control by moving back and forth the heavy hot air generating means itself composed of a blower, a heater, etc. Had a fairly large-scale movement method in which hot air generating means was mounted on a trolley and moved by a jack or the like. Therefore,
Not only is the cost of the device high, but the mass of the movable part is large, so the control accuracy is reduced due to the moving weight and inertia. Further, since the movement control of the hot air generating means was executed using only the supply amount of the container as a control signal, the influence on the heating state of the sticking drum based on the change in the ambient temperature in the sticking work area and the error in the movement control. Could not be fixed. Therefore, there is no guarantee that the heat-sensitive label sticking operation is always performed in a good heating state, and sticking failure may occur due to the generation of an undissolved portion of the adhesive-encapsulated capsule. The present invention has been made in view of such circumstances of the related art, and aims to improve the control accuracy by reducing the mass of the movable portion for executing the heating control, and the sticking of the thermal label is always good. The aim is to improve the control arrangement so that it can be performed in the heated state.

[0004]

In order to achieve the above object, the present invention provides a heat source in the blower air passage of a blower, and supplies hot air from a blower outlet downstream thereof toward a heat-sensitive label on a sticking drum. In the heating device for the heat-sensitive label, a rotation speed detecting means for detecting the rotation speed of the sticking drum, a temperature detecting means for detecting the surface temperature of the sticking drum, and a control means for controlling the hot air condition from the outlet are provided. It is characterized in that the hot air state from the outlet is controlled via the control means based on the detection signals from the rotation speed detection means and the temperature detection means. Specific examples of the control means include one that controls the amount of air blown by the blower itself, one that controls the heat generation amount of the heat source, or one that controls the opening / closing of an on-off valve installed downstream of the heat source. . Further, a bypass passage that bypasses the heat source can be formed downstream of the blower.

[0005]

According to the present invention, the hot air condition from the air outlet is controlled on the basis of the number of rotations of the sticking drum, that is, the supply amount of the heat-sensitive label and the surface temperature of the sticking drum. Improved and always good heating conditions are obtained. That is, when the rotation speed of the sticking drum changes due to a change in the supply amount of the heat-sensitive label, the control means is immediately operated and the heating state corresponding to the rotation speed is entered, so that the response speed is fast. However,
As described above, the responsiveness of the hot air control focusing on the number of rotations of the sticking drum is fast, but since it does not respond to changes in the ambient temperature of the sticking work area, a steady state is reached after a predetermined time. When it reaches, the optimum heating state is not always obtained. In the present invention, since hot air control focusing on the surface temperature of the sticking drum is added, the control result focusing on the rotation speed can be corrected to the optimum heating state. In other words, aiming at the synergistic effect of both controls, hot air control that focuses on the rotation speed of the sticking drum achieves a fast response speed, and hot air control that focuses on the surface temperature of the sticking drum corrects the optimum heating state. This control configuration is characterized. Further, since the blower air volume control, the heat generation amount control of the heat source or the open / close control of the open / close valve is adopted as the specific control means, the mass of the movable part is significantly reduced as compared with the conventional example. Obstacles due to weight and deterioration of control accuracy due to inertial force can be greatly reduced. Furthermore, if a bypass path for bypassing the heat source is formed downstream of the blower, cold air can be efficiently switched through the bypass path when the sticking drum is stopped, etc. It is possible to correspond.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a main part of an embodiment of the present invention. As shown in the figure, the conveying path 1 is in contact with a part of the outer circumference of the sticking drum 2 in an arc shape, and the sticking work area 3
Is formed. An article 4 such as a container transported on the transport path 1 is supplied to the sticking work area 3 with a timing by the star wheel 5, and when passing through the work area 3, the sticking work of the heat sensitive label 6 is performed. The transport path 1 may be a rotary type. On the back surface of the heat-sensitive label 6, a large number of adhesive-encapsulating capsule groups in which an adhesive is encapsulated in minute capsules that melt at a predetermined temperature are applied. Further, a hot air outlet 7 is provided on the outer periphery of the sticking drum 2 adjacent to the sticking work area 3, and this portion is adsorbed on the sticking drum 2 with the adhesive surface side of the back surface facing up. When the heat-sensitive label 6 is passed, it is heated by the hot air from the air outlet 7.
By this heating, the capsules on the back surface of the heat-sensitive label 6 are melted and the adhesive is exposed. In this way, the heat-sensitive label 6 with the adhesive exposed is supplied to the sticking work area 3 and sequentially delivered to the side of the article 4 for sticking. In addition,
In the figure, 8 is a delivery drum for supplying the heat-sensitive label 6 to the sticking drum 2.

An outline of the heating control device will be described. As shown in FIG. 1, on the upstream side of the hot air outlet 7 described above,
An appropriate heat source 9 such as an electric heater and a blower 10 are connected, and the air blown by the blower 10 is heated when passing through the heat source 9 portion, and is blown out as hot air from the outlet 7. The state of the hot air blown from the air outlet 7 is controlled by the control unit 11 including a microcomputer or the like. There are various types of specific control means as described later. Detection signals from a rotation speed detection means 12 for detecting the rotation speed of the sticking drum 2 and a temperature detection means 13 for detecting the surface temperature of the sticking drum 2 are input to the control section 11, and the detection signals are outputted based on both detection signals. A control command signal related to the hot air condition from the outlet 7 is output. A rotary encoder or the like is used as the rotation speed detecting means 12, and a non-contact type or an appropriate contact type such as a radiation thermometer is used as the temperature detector 13.

Next, a specific example of the control means for controlling the hot air condition will be described with reference to FIGS.
FIG. 2 shows a first embodiment in which the state of hot air from the air outlet 7 is controlled by controlling the air flow rate of the blower 10. As illustrated, in this embodiment, the control unit 11
In, the current pasting environment is determined based on the detection signals from the rotation speed detection means 12 and the temperature detection means 13, and a command signal relating to the air flow rate is output to the blower 10. For example, when the supply amount of the article 4 is changed and the rotation speed of the sticking drum 2 is increased, it is necessary to increase the temperature of the hot air from the outlet 7. In this case, when the blown air amount of the blower 10 is reduced, the blowout temperature rises and its quantitative relationship, and the mutual relationship between the rotation speed of the sticking drum 2 and the optimum blowout temperature is empirically obtained in advance by experiments or the like. Check with. Then, the result is stored in the memory of the control unit 11 as a control map or the like. When the rotation speed detecting means 12 detects an increase in the rotation speed of the sticking drum 2, the optimum air flow rate to be reduced is obtained with reference to a control map or the like stored in the memory of the control unit 11. It is output as a command signal to the blower 10. In the blower 10, a blower amount that matches a command value is obtained through known control means relating to the blown air amount, for example, rotation speed control of the rotary blades, suction valve or discharge valve control for adjusting the flow passage area on the suction side or the discharge side, and the like. To realize. Similarly, when a decrease in the number of revolutions of the sticking drum 2 is detected, an appropriate amount of air is blown from the blower 10 via the controller 11.
Be raised. As described above, since the air volume control for the blower 10 based on the change in the rotation speed of the sticking drum 2 is immediately executed, the hot air state corresponding to the changed rotation speed, that is, the condition of the optimum blowout temperature is promptly adjusted. become.

On the other hand, in the present invention, in addition to the number of rotations of the sticking drum 2, the surface temperature is also used as a control signal, which is simultaneously input to the control section 11 via the temperature detecting means 13 and is applied to the sticking drum 2. Optimum surface temperature control for sticking work is performed by controlling the air flow rate of the blower 10 so that the surface temperature falls within a predetermined allowable range. Therefore, even if the optimum surface temperature is not achieved as a result of the influence of the change in the ambient temperature that has not been incorporated in the control based on the rotation speed, it is finally corrected by this surface temperature control. It will be. Furthermore, it is possible to effectively cope with the case where an abnormal temperature occurs due to some cause. In the case of only this surface temperature control, since the command signal is output only after the surface temperature of the sticking drum 2 has decreased by a predetermined amount, a delay in rising in the air flow control of the blower 10 is taken into consideration and a high response is obtained. Sex is difficult. As described above, the combination of the rapid start of the air volume control based on the rotation speed of the sticking drum and the optimum surface temperature control of the sticking drum is technically very effective.

FIG. 3 shows a second embodiment in which the state of hot air from the air outlet 7 is controlled by controlling the heat generation amount of the heat source 9 arranged on the downstream side of the blower 10.
Compared to the first embodiment, the present embodiment has a control target changed from the blown air amount control of the blower 10 to the heat generation amount control of the heat source 9, and the rest of the configuration is the same. In the control unit 11, the current pasting environment is judged based on the detection signals from the rotation speed detection unit 12 and the temperature detection unit 13, and a command signal regarding the heat generation amount is output to the control unit for the heat source 9 (not shown). It As a result, the heat generation control focusing on the rotation speed of the sticking drum 2 and the heat generation control focusing on the surface temperature are performed in parallel, and the same operation as in the case of the first embodiment described above can be obtained. is there. In this embodiment, since there is no movable part to be controlled, there is no problem with weight and inertia during movement as in the conventional example.

FIG. 4 shows a third embodiment in which the state of hot air from the air outlet 7 is controlled by controlling the on-off valve 14 for blowing air provided on the downstream side of the heat source 9. The present embodiment is characterized in that the opening / closing valve 14 is controlled to be opened / closed as a control target, and the rest of the configuration is the same as that of the embodiment. When the opening / closing valve 14 is controlled to open / close, the amount of air blown to the other changes depending on the size of the opening, and the amount of hot air blown from the outlet 7 toward the sticking drum 2 is controlled.
In the control unit 11, the current pasting environment is judged based on the detection signals from the rotation speed detecting unit 12 and the temperature detecting unit 13, and the driving unit 15 including an electric motor with an encoder for driving the opening / closing valve 14 is used. In response, a command signal is output. As a result, the heat generation control focusing on the rotation speed of the sticking drum 2 and the heat generation control focusing on the surface temperature are performed in parallel, and the same operation as that of the first and second embodiments described above can be obtained. is there.

FIG. 5 shows a fourth embodiment in which a bypass 16 for bypassing the heat source 9 is formed.
This is applicable to each of the above-mentioned embodiments. In this example,
The bypass passage 16 is formed in the structural example in which the mounting position of the opening / closing valve 17 having the same function as the opening / closing valve 14 of the third embodiment is shifted. In the figure, 18 is a control valve of the bypass passage 16, 19 is a drive means of the control valve 18 including an electric motor with an encoder, etc., and 20 is a drive means of the opening / closing valve 17. In the present embodiment, when the pasting drum 2 is stopped or the like, the drive means 19 is controlled to switch the control valve 18 to the bypass passage 16 side, whereby the supply of cold air can be efficiently switched. A quick response to prevent overheating is possible. In this case, it is more effective if the control unit 11 fully opens the on-off valve 17 via the drive means 20 to blow hot air. At that time, it is also effective to turn off the heat source 9 and increase the amount of air blown from the blower 10.

In the description of the embodiment shown in FIGS. 2 to 4, the case where each type of control configuration is used independently has been described, but it is also possible to combine them. Further, the formation of the bypass passage shown in FIG. 5 and the combination of the respective embodiments can be freely combined. In addition, the hot air control performed by paying attention to the number of revolutions of the pasting drum is limited to a rough stepwise control form, and it is also possible to combine the control focusing on the surface temperature with a finer control form to supplement it. is there.

[0014]

According to the present invention, the following effects can be obtained based on the above configuration. (1) Since the hot air control focusing on the number of rotations of the sticking drum, that is, the supply amount of the heat-sensitive label and the hot air control focusing on the surface temperature of the sticking drum are combined, the responsiveness is fast and the hot air state from the outlet can be controlled. It can always be kept in good condition. (2) As the specific control means for controlling hot air, the blower air volume control, the heat generation amount control of the heat source, the opening / closing control of the on-off valve, etc. are adopted. Since it is significantly reduced in comparison, it is possible to significantly reduce obstacles due to the weight and deterioration of control accuracy due to inertial force. (3) By forming a bypass path that bypasses the heat source, it is possible to efficiently switch to the supply of cold air through the bypass path when the sticking drum is stopped.
A quick response to prevent overheating is possible.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a main part of an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a main part of a first embodiment of the present invention.

FIG. 3 is a schematic configuration diagram showing a main part of a second embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing a main part of a third embodiment of the present invention.

FIG. 5 is a schematic configuration diagram showing a main part of a fourth embodiment of the present invention.

[Explanation of symbols]

1 ... Transport path, 2 ... Sticking drum, 3 ... Sticking work area, 4 ...
Articles, 5 ... Star wheel, 6 ... Thermal label, 7 ... Air outlet, 8 ... Delivery drum, 9 ... Heat source, 10 ... Blower, 11
... Control unit, 12 ... Rotation speed detecting means, 13 ... Temperature detecting means, 14 ... On-off valve, 15 ... Driving means, 16 ... Bypass passage, 17, 18 ... On-off valve, 19, 20 ... Driving means

Claims (5)

[Claims] 1. A heating device for a heat-sensitive label, wherein a heat source is provided in a blower blowing path, and hot air is supplied from a blowout port downstream of the heat source toward a heat-sensitive label on the sticking drum. Rotation speed detection means for detecting, temperature detection means for detecting the surface temperature of the sticking drum, and control means for controlling the hot air state from the outlet, detection signals from the rotation speed detection means and temperature detection means A heating control device for a heat-sensitive label, characterized in that the state of hot air from the air outlet is controlled based on the control means. 2. The heating control device for a heat-sensitive label according to claim 1, wherein the control means controls the hot air state from the air outlet by controlling the amount of air blown by the blower itself. 3. The heating control device for a heat-sensitive label according to claim 1, wherein the control means controls the state of hot air from the air outlet by controlling the amount of heat generated by the heat source. 4. The heating control of the heat-sensitive label according to claim 1, wherein the control means controls the state of hot air from the air outlet by opening and closing an on-off valve installed downstream from the heat source. apparatus. 5. A bypass passage for bypassing the heat source is formed downstream of the blower, and a control valve is provided in the bypass passage, according to any one of claims 1 to 4. Heating control device for thermal labels.