JP2009051044A - Paste fusing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paste fusing device having a paste fusing container in which fused paste convects at all times with no stagnation. <P>SOLUTION: An agitating member for convection to agitate the paste fused with a heating means is provided on the bottom of the paste fusing container on the downstream side in the rotational direction of a coating roller. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a glue melting device that applies glue to the back of a sheet bundle.

A glue melting apparatus used in a bookbinding apparatus that binds glue on the back side of a sheet bundle melts solid glue such as a thermoplastic adhesive called a hot melt adhesive by a heating means to become a liquid. The glue is attached to a rotating application roller, and the application roller tries to glue and bind while contacting the back surface of the sheet bundle.
At this time, the melted glue flows along the rotation direction of the roller through the glue melting container, which is a container for storing the glue, by the rotation of the application roller. However, when the glue that has flowed hits the inner wall surface of the glue melting container, a liquid stagnation part is formed at the corner between the wall surface and the bottom plate, where the glue does not flow and does not move. The paste remaining in the liquid starch portion is always heated and the deterioration of the paste partially proceeds, resulting in a problem that the adhesive strength of the paste changes.

In order to solve such a problem, for example, Patent Document 1 discloses a gluing device that adopts a circulation method, and returns surplus glue to the intermediate tank without being transferred to the application roller, and puts glue in the intermediate tank. A gluing device is described in which a propeller for stirring is provided and glue is returned to a coating roller from a passage such as a pipe.
JP-A-8-276147

  However, in the technique described in Patent Document 1, an application part that is applied by an application roller and an intermediate tank part that collects excess glue that is not applied are provided separately, and a propeller for stirring the glue is provided in the middle. It has a structure in the tank. Therefore, the new problem that the whole gluing apparatus will become large generate | occur | produces.

  An object of the present invention is to provide a glue melting apparatus having a glue melting container in which melted glue always convects without stagnation.

The above object can be achieved by the following configuration.
1. A glue melting device that applies glue to the back of a sheet bundle formed by stacking printed sheets,
A paste melting container for containing the paste;
Heating means for melting the paste;
An application roller for applying glue to the back of the sheet bundle;
Drive means for rotationally driving the application roller;
A convection stirring member that stirs the glue melted by the heating means at the bottom in the glue melting container on the downstream side in the rotation direction of the application roller;
A paste melting apparatus comprising:
2. 2. The glue melting apparatus according to 1, wherein the convection stirring member is a metal roller and rotates in a direction to return the melted glue to the application roller.

  According to the present invention, since the convection stirrer for stirring the paste is provided, it is possible to provide a paste melting apparatus in which the melted paste always convects without stagnation and no deterioration of the paste occurs.

  An embodiment of the present invention will be described. In addition, although this invention is demonstrated based on embodiment of illustration, this invention is not restricted to this embodiment. In addition, the following assertive description in the embodiment of the present invention shows the best mode, and does not limit the meaning or technical scope of the terms of the present invention.

  Fig.1 (a) is a top view which shows the structure of the glue melting apparatus based on this invention, FIG.1 (b) is the AA sectional drawing. FIG. 2 is a schematic perspective view of the glue melting apparatus. Further, FIG. 3A is a view of a conventional glue melting apparatus, and FIG.

In FIG. 1, a glue melting apparatus 1 includes a glue storage unit 2 that stores a solid paste G such as a thermoplastic adhesive called a hot melt adhesive, and is supplied from the glue storage unit 2 and melted by a heating unit 3. The paste melting container 4 which is a container for storing the glue G and moving means (not shown) for moving the glue melting container 4 in the arrow X direction are mainly configured.
(Glue melting container)
Next, the glue melting container 4 used in the glue melting apparatus 1 according to the present invention will be described in detail with reference to FIGS. The glue melting container 4 has a box shape, and heating means 3 for melting the glue G is incorporated in a coating roller 5 that rotates while adhering the melted glue G and contacting the back surface of the sheet bundle. . Further, there is provided a forming roller 6 that can rotate in the same direction as the rotation direction of the application roller 5 and evenly arranges the glue adhered to the back surface of the sheet bundle.

  The application roller 5 and the forming roller 6 can be rotated in the direction of the arrow Y by a driving means 7 composed of a motor and a driving train, and the rotation speed is controlled by the speed control means 8 to be a predetermined speed. ing. Further, the heating means 3 is controlled by the heating control means 9 so as to reach a predetermined temperature based on the measurement result of the temperature sensor TS that measures the temperature provided in the paste melting container 4. The amount of glue G supplied from the glue storage unit 2 detects a reference amount set by the liquid level sensor 10 provided in the glue melting container 4, and controls the movement of the glue melting device using the detection signal. Is sent to the central control means MC, and the open / close door 11 of the glue storage section 2 is opened and closed based on an instruction from the central control means MC so that an appropriate amount of solid glue is supplied.

  Further, a convection stirring member 13 for stirring the flow of glue melted by the heating means is provided on the downstream side in the rotation direction of the application roller 5 and in the vicinity of the bottom in the glue storage container 4. The convection stirring member 13 is a roller made of a metal such as iron, and is rotated by the driving means 7 in a direction to return the melted glue to the application roller.

By using the convection stirrer 13 in this way, the flow of the glue G circulates as shown by the arrow Z shown by the thick line in FIG. 1, and the glue stagnates so that no liquid stagnation portion is generated.
(Conventional glue melting device)
As shown in FIG. 3, the glue melting container 4 ′ used in the conventional glue melting apparatus having no glue circulation mechanism is formed with a liquid stagnation part 20 in which the glue stagnates at the ridge with the bottom plate and does not move. .
(flowchart)
Hereafter, the operation | movement which the control part of the paste melting apparatus 1 which concerns on this Embodiment performs is demonstrated using the flowchart of FIG.

  Application of glue on the back side of the sheet bundle is started (S1), and whether or not there is glue in the glue melting container 4 is determined by a detection signal of the liquid level sensor 10 (S2). When there is no paste in the paste melting container 4 (S2: No), the paste is supplied from the paste storage unit 2 (S3), and the process returns to S2. When there is paste in the paste melting container 4 (S2: Yes), the power supply of the heating means 3 is turned on (S4). It is determined whether or not a predetermined temperature is reached (S5). When the predetermined temperature is reached (S5: Yes), the application roller 5 and the forming roller 6 are rotated (S6).

  The glue melting container 4 is moved in the back direction of the sheet bundle to the position where the gluing is completed (S7), and moved to the original position (referred to as the home position) (S8), and excess glue attached to the back surface by the forming roller 6 is removed. Wipe off. The glue melting container 4 stops at the home position (S9). Thereafter, the power supply of the heating means 3 is turned off (S10), and the rotation of the application roller 5 and the forming roller 6 is stopped (S11).

Fig.1 (a) is a top view which shows the structure of the paste melting apparatus which concerns on this invention. FIG.1 (b) is the AA sectional drawing. It is a schematic perspective view of a paste melting apparatus. FIG. 3A is a diagram of a conventional glue melting apparatus. FIG. 3B is a sectional view taken along the line BB. It is a flowchart which the control part of the paste melting apparatus 1 which concerns on this Embodiment performs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paste melting apparatus 2 Paste storage part 3 Heating means 4 Paste melting container 5 Application roller 6 Forming roller 7 Driving means 8 Speed control means 9 Heating control means 10 Liquid level sensor 11 Opening / closing door 13 Convection stirring member G Paste Z Paste flow direction

Claims (2)

A glue melting device that applies glue to the back of a sheet bundle formed by stacking printed sheets,
A paste melting container for containing the paste;
Heating means for melting the paste;
An application roller for applying glue to the back of the sheet bundle;
Drive means for rotationally driving the application roller;
A convection stirring member that stirs the glue melted by the heating means at the bottom in the glue melting container on the downstream side in the rotation direction of the application roller;
A paste melting apparatus comprising: 2. The glue melting apparatus according to claim 1, wherein the convection stirring member is a roller made of metal, and rotates in a direction in which the melted glue is returned to the application roller.

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