JP2005246768A - Pasting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pasting device which has a constitution which enables the use of the heating efficiency of a long-lived/slender heater with a high rotary drum and prevents a bearing of a drum rotating shaft from soaking in a paste. <P>SOLUTION: In this pasting device, an electrical heater storage part of a heat conductor is formed by opening a heater storage hole 4 in a base 17, as the rotating center part, of the rotary drum 1, and it is so arranged that even a slender heater (a cartridge heater 5) can efficiently heat a drum cylinder 2 (a wheel) by connecting a base 17 and the drum cylinder 2 with a plurality of spokes 3 of the heat conductor, and bearings 9 and 10 of the rotating shafts 8 and 11 of the rotary drum 1 do not soak in the paste of a melt tank 7 by making the rotating shafts 8 and 11 slender. Since the cartridge heater 5 rotates with the rotary drum 1, electricity is supplied through a carbon brush 14 and a slip ring 13. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention belongs to the technical field of a gluing device for gluing, for example, a cover to the main body in the bookbinding process.

  2. Description of the Related Art Conventionally, in the bookbinding process, when a cover is pasted on the main body, as shown in FIG. 2, the rotating drum 22 rotating in a state where it is immersed in the melted paste heated and melted in the melt tank 7 by about one third. On the top of the main body 20, the clamped body 20 is moved with a moving clamper (not shown) with the back 21 to which the cover is glued down, and the glue adhered to the surface of the rotating drum 22 is applied to the back 21 of the main body 20. I try to paint it. After the paste is applied, the paste is further moved to the right, and the paste is made uniform by the scraper 36. Then, the paste is sent to a not-shown cover sticking device (nipping device), where the cover is attached.

The glue used for pasting the cover is hardened at room temperature and melts when heated.
The paste is applied to the body 20 in this molten state. Therefore, the glue 23 in the melt tank 7 must be heated.
As a heating means, conventionally, a bobbin heater 29 is placed in the rotary drum 22.

FIG. 3 is a diagram showing a conventional heating structure, and is a schematic sectional view seen from above.
The inside of the rotating drum 22 is a cavity, and a bobbin heater 29 is inserted into this cavity. For example, a nichrome wire 30 is wound around an unglazed porcelain. The nichrome wire 30 is energized to generate heat, and the heat is transmitted to the surface of the rotating drum 22 mainly by radiation. Therefore, in order to increase the heating efficiency, it is preferable to shorten the distance between the heating element and the surface of the rotating drum, so the diameter of the bobbin heater 29 is set to be thick.

Since the nichrome wire 30 is in direct contact with the air, the bobbin heater 29 is likely to oxidize, and as a result, is easily broken and has a short life. If it is disconnected, it must be replaced and must be pulled out of the rotating drum 22. At this time, the lid 37 is removed and the disconnected bobbin heater 29 is taken out and replaced with a new one.
For this reason, the diameter of the cylindrical portion 31 of the rotary drum 22 is large enough to allow the bobbin heater 29 to be taken in and out.

  On the other hand, the rotation of the rotary drum 22 is made possible by rotating the rotary shaft 28 of the rotary drum 22 with the cylindrical portion 31 being supported by a bearing 25 and a bearing 26 provided on the side wall of the melt tank 7. The cylindrical portion 31 is provided with a drum gear 34, and a drive gear 35 is engaged therewith. Therefore, the rotating drum 22 can be rotated by rotating the drive gear 35 with a motor.

  Since the bobbin heater 29 is connected to the heater wiring 33 and cannot be rotated, the bobbin heater 29 is supported by the bearing 27 provided on the lid 37 (the above description is based on the fact that the applicant actually I did not know any prior art known documents at the time of filing).

However, the conventional gluing device has the following various problems.
First, since the heating from the bobbin heater 29 to the surface of the rotary drum 22 is mainly performed by radiation, there is a problem that the thermal efficiency is still poor even if the diameter of the bobbin is increased.

Second, the life of the bobbin heater 29 is short. And that easily oxidized because nichrome wire 30 is in contact with the air directly, because tends to control to a high temperature to just nichrome wire 30 itself since the thermal efficiency is low as described above.
Moreover, since the nichrome wire 30 is exposed, it is easy to happen that the tube portion 31 is touched and disconnected accidentally during installation and removal.

  Third, although the heating from the bobbin heater 29 to the rotating drum 22 is mainly due to radiation, there is a space between the bobbin heater 29 and the peripheral surface of the rotating drum 22, so that heat convection occurs and the heating degree of the upper part becomes high. When the rotary drum 22 stops, there is a problem that the upper part of the rotary drum 22 becomes high temperature and the heating state is not uniform along the circumference.

  Fourthly, since the diameter of the cylindrical portion 31 of the rotary drum 22 is large, there is a problem that heat easily escapes from this portion, which spurs poor thermal efficiency.

Fifthly, as a result of the cylindrical portion 31 becoming thicker for inserting and removing the bobbin heater 29 into and out of the rotating drum 22, the diameter of the bearing 26 that supports the cylindrical portion 31 is also increased. Yes.
When the operation is stopped in such a state, the temperature of the paste 23 is lowered and solidifies at room temperature.

  Next, when the operation is resumed, the paste 23 is heated and melted again. However, heat is mainly transmitted from the inner peripheral surface of the rotary drum 22, and the melting of the paste 23 at the cylindrical portion 31 and the bearing 26 portion is delayed. That is, the portion of the rotating drum 22 in contact with the circumferential surface is sufficiently melted so that the rotating drum 22 can be rotated, but the bearing 26 portion is not yet sufficiently melted, and the seal between the cylindrical portion 31 and the bearing 26 is still halfway. There is a glued state. When the rotating drum 22 is rotated in this state, the seal may be pulled and displaced or peeled off. In such a case, there is a problem that molten glue may leak.

  It is an object of the present invention to provide a gluing device that solves the various problems in the prior art.

In order to solve the above problems, the gluing device of the present invention has the following configuration.
The first configuration is a rotating drum for applying a paste to the main body by rotating and melting the normal temperature solid paste in a melt tank containing the paste in a gluing device for applying the paste to the main body in the bookbinding process. The heating structure is provided with an electric heater housing portion of the heat conductor at the rotation center portion of the rotating drum, and also provided with heat conductor radiation connecting the housing portion and the cylindrical portion of the rotating drum, and the electric heater housed in the housing portion Power is supplied to the rotary drum through the slip ring that rotates together with the rotating brush and a fixed brush in contact with the slip ring, and the heat generated by the electric heater conducts the storage part and radiation to the cylindrical part surface of the rotary drum. It is characterized by being transmitted.

  The second configuration is characterized in that, in the first configuration, the electric heater is a cartridge heater.

  The third configuration is characterized in that a disk is used in place of the slip ring in the first configuration or the second configuration.

  As described above, in the gluing device of the present invention, the electric heater storage portion of the heat conductor is provided at the rotation center portion of the rotary drum, and the heat conductor is provided between the storage portion and the ring (drum cylinder) of the rotary drum. Since the structure is connected by radiation, the heat of the electric heater is transmitted from the housing portion to the ring of the rotating drum by conducting the radiation. In other words, heat is transmitted to the surface of the rotating drum by conduction rather than by radiation as in the prior art, so that the heat efficiency is very good and the electric heater does not need to be as thick as the bobbin heater of the conventional apparatus. That is, a thin heater is sufficient.

As a result, a thick portion such as a cylindrical portion of a conventional rotating drum becomes unnecessary, and there is no heat escaping from this portion, and the diameter of the bearing corresponding to the cylindrical portion can be reduced. It can be prevented from being soaked in the glue, and the seal will not be displaced or peeled off as in the past.
Further, the presence of radiation reduces the convection in the rotating drum and eliminates uneven heating due to convection.

In this way, the heat from the electric heater is transmitted by conduction rather than radiation, so there is no need for the heating element to be exposed unlike a bobbin heater, and it can be covered with a heat-resistant insulator with good thermal conductivity. In addition to preventing deterioration of the heating element due to oxidation, the heat transfer efficiency to the surface of the rotating drum is good, so that it is not necessary to heat the heating element as in the case of a conventional bobbin heater, and the life of the heating element is prolonged.
In addition, there is an advantage that disconnection due to collision with other objects during handling can be prevented by the coating.

  In the best embodiment of the gluing device of the present invention, the electric heater is an elongated cylindrical member whose heating element is coated with a heat-resistant insulator having good thermal conductivity, and the rotating drum is the axis of the rotating shaft of the heat conductor. It has a cylindrical hole in which the electric heater can be inserted in the direction, and the rotating shaft and drum cylinder are connected by radiation of a heat conductor. The rotating shaft and the bearing that supports the rotating shaft are the melt paste in the melt tank. The electric heater is supplied with power by a slip ring or slip disk which is provided on the rotating shaft and rotates together with a fixed shoe.

Embodiments of the gluing device of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing the structure of an embodiment of the inventive part of the gluing device. (A) is the top view which looked at the rotating drum part in a melt tank from the top. FIG. 2B is a cross-sectional view of the rotary drum 1 taken along the line AA. (C) is a cartridge heater.
The AA cross section of the rotating drum 1 has a structure as shown in FIG. A heater housing hole 4 is provided at the rotation center portion of the base portion 17, and both form an electric heater housing portion. A cartridge type heater as shown in (c) is inserted into the heater housing hole 4 and rotates together with the rotating drum. The relationship between the inner diameter of the heater housing hole 4 and the outer diameter of the cartridge heater 5 is preferably as close as possible as long as there is no hindrance to loading and unloading.

  The drum cylinder (also referred to as a ring) 2 and the base 17 are connected by a plurality of radiations 3. Heat generated by the cartridge heater 5 in the heater housing hole 4 is transmitted to the base portion 17 by contact between the two, and is transmitted from the base portion 17 to the drum cylinder 2 by conduction in the radiation 3.

Whereas the conventional device transmits heat from the heater heating element to the drum cylinder by radiation, the present invention is characterized in that it transmits heat by conduction of radiation.
The material is cast and has good thermal conductivity. Therefore, the cartridge heater may be thin.

In FIG. 2A, the rotary drum 1 is provided with a rotary shaft 8 and a rotary shaft 11 on both sides, and each is rotatably supported by a bearing 9 and a bearing 10 provided on the side wall of the melt tank 7. .
A drum rotating gear 12 is fixed to the rotating shaft 11, and a driving gear (not shown) is engaged therewith. The rotating drum 1 is rotated by the rotation of the drive gear. The rotating shaft 11 is hollow so that the cartridge heater 5 can be inserted and removed and also serves as a wiring path for the heater power supply line 6. Since a thin heater such as the cartridge heater 5 can be used as the electric heater, the rotating shaft 11 can be made thinner accordingly.

The rotating shaft 8 is not particularly limited in size because it does not take in and out the object.
Therefore, the bearing 9 and the bearing 10 can be prevented from being immersed in the molten paste in the melt tank. The two heater power supply lines 6 of the cartridge heater 5 pass through the hollow portion of the rotating shaft 11 and are connected to slip rings 13 provided on the rotating shaft 11, respectively.

  Each slip ring 13 is in contact with a carbon brush 14 held by an arm 16, and a wire 15 is connected to the carbon brush 14, whereby power is supplied to the cartridge heater 5.

With the structure as described above, various advantages described in the effect of the invention can be obtained.
In the present embodiment, the radiation 3 of the rotary drum 1 has a symmetrical radial structure, but is not limited to such a structure, and connects the base portion 17 and the drum cylinder to conduct heat. Any structure capable of satisfying the above is included in the radiation referred to in the present invention.

It is a figure which shows the structure of the Example of this invention gluing apparatus. It is a figure which shows schematic structure of the conventional gluing apparatus. FIG. 3 is a plan sectional view showing details of a rotating drum portion in FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotating drum 2 Drum cylinder 3 Radiation 4 Heater accommodation hole 5 Cartridge heater 6 Heater feeder 7 Melt tank 8 Rotating shaft 9, 10 Bearing 11 Rotating shaft 12 Drum rotating gear 13 Slip ring 14 Carbon brush 15 Wiring 16 Arm 17 Base 20 Body 21 Back 22 Rotating drum 23 Glue 24 Melt glue surface 25, 26, 27 Bearing 28 Rotating shaft 29 Bobbin heater 30 Nichrome wire 31 Tube part 32 Bobbin neck 33 Heater wiring 34 Drum gear 35 Drive gear 36 Scraper 37 Lid

Claims (3)

  In the gluing device that applies glue to the body in the bookbinding process, the heating structure of the rotating drum that rotates and melts the solid paste at room temperature in the melt tank that contains the glue, and then applies the glue to the body rotates. A heat conductor electric heater storage part is provided at the center of rotation of the drum, and a heat conductor radiating between the storage part and the cylindrical part of the rotary drum is provided so that the electric power supplied to the electric heater stored in the storage part is rotated. It is carried out through a slip ring which is provided on the rotating shaft of the drum and rotates together with a fixed brush in contact with the rotating ring, and heat generated by the electric heater is conducted to the housing portion and the radiation to be transmitted to the cylindrical portion surface of the rotating drum. A characteristic glueing device.   The gluing device according to claim 1, wherein the electric heater is a cartridge heater. A gluing device using a disk instead of the slip ring in the configuration of claim 1 or 2.

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