JPH06296931A - Adhesive supplying method - Google Patents

Abstract

PURPOSE:To eliminate such trouble as the hardening of an adhesive when the coating of the adhesive is suspended due to the mechanical trouble, etc., and then the adhesive is resupplied on a material to be coated from an adhesive discharge means. CONSTITUTION:A dispenser 1 is moved to a temporary position deviated from a normal position when mechanical trouble is developed, and an adhesive is intermittently discharged. When the trouble is eliminated, the nozzle 12 at the tip of the dispenser is cleaned by a cleaning means 8, the dispenser is returned to the normal position, and the adhesive is discharged on a material 6 to be coated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive supply method,
More specifically, the present invention relates to an adhesive agent supply method for automatically supplying an adhesive agent onto an object to be coated by means of an adhesive agent ejecting means for ejecting the adhesive agent from a nozzle located above the conveyance path of the object to be coated.

[0002]

2. Description of the Related Art Conventionally, adhesives have been used in various fields to fix or bond parts of various products. When a large amount of this adhesive is used, for example, in various manufacturing plants, from the viewpoint of productivity, a large amount of the adhesive is stored in an appropriate closed adhesive container or the like so as not to cure, and the adhesive container is coated with the adhesive. In some cases, a method is used in which the adhesion device is connected by an appropriate liquid feeding system, and the adhesive in the adhesive container is pressurized to discharge a predetermined amount of the adhesive.

There are various kinds of adhesives that have been used conventionally, but room temperature curing type adhesives (including volatile solvents) are widely used because of their good handleability and low cost. There is. As a means for performing bonding using this room temperature curable adhesive, for example, the applicant of the present invention has disclosed that
There is one which is applied to the magnetic disk cartridge already proposed in Japanese Patent No. In the one disclosed in this publication, a magnetic disk cartridge accommodating a disc-shaped magnetic sheet has a structure in which a flange portion of a center core is attached to a central hole of the magnetic sheet, and the center core and the magnetic sheet are attached to each other. A liquid adhesive obtained by adding an epoxy-based curing agent to a room temperature curing heat-activatable acrylic resin is used for wearing. And by using this adhesive,
Compared with the conventional one, the initial sticking force is stronger and the inconvenience that the center core and the magnetic sheet are displaced in the assembling process is eliminated, and the final strength can be improved, and an inexpensive magnetic disk cartridge is obtained.

On the other hand, an apparatus for discharging a fixed amount of the adhesive as described above to a predetermined position of the magnetic sheet to perform the adhesion, for example, a fluid fixed amount which the applicant of the present invention has already proposed in Japanese Patent Laid-Open No. 3-101862. There is a discharge device. In the fluid constant-volume discharge device disclosed in this publication, the adhesive in a suitable adhesive container is pressurized by a pressurizing means, and is sent to the adhesive ejecting means through a pressure piping system connected to this adhesive container. Further, the adhesive can be supplied to a predetermined position of the object to be coated under the control of the control means as appropriate. That is, by appropriately controlling the adhesive discharge means by the control means, the supply of the adhesive from the pressure piping system is configured to be discharged from the nozzle of the adhesive discharge means in a required amount, and the adhesive discharge position is set. A predetermined amount of adhesive can be supplied from the nozzle to an object to be continuously conveyed and appropriately rotated at the adhesive supply position, and for example, the object to be continuously conveyed can be efficiently conveyed. It enables the application process of applying the adhesive.

[0005]

In the coating step as described above, the conveyance of the object to be coated may be stopped due to a trouble, for example. At this time, in the case of the adhesive ejecting means provided with the nozzle, if the adhesive is a room temperature curing type adhesive that cures relatively quickly such that the adhesive contains a volatile solvent, the adhesive ejecting means If it is stopped for a long time, the adhesive will be solidified at the tip of the nozzle. Therefore, it is necessary to remove the solidified adhesive when the coating process is restarted. However, the removing work and the cleaning work of the tip portion of the nozzle are very troublesome, and there is a problem that the nozzle is damaged in some cases. Further, as a method of solving the above-mentioned solidification problem, for example, there is a method of continuously discharging the adhesive, but in this method, the adhesive is extremely wasteful, When the runoff was stopped, a phenomenon occurred in which the adhesive pulled a thread from the nozzle, and the application process could not be restarted until the thread was eventually removed, and the cleaning operation was still necessary. The present invention has been made in view of the above problems, and after stopping this coating step in the adhesive coating step, the adhesive is normally supplied to the object to be coated even when the adhesive discharging means is restarted. It is an object of the present invention to provide a method for supplying an adhesive which can be applied in a fixed amount and which does not increase the amount of the adhesive used.

[0006]

That is, the above-mentioned object of the present invention is to provide an adhesive ejecting means for ejecting an adhesive from a nozzle located on the upper side of a conveyance path of the article to be coated onto the article to be coated. In the adhesive supply method for supplying the adhesive, when the adhesive discharge from the nozzle is stopped for a certain period of time or more, at least the nozzle is moved from a working position to a standby position and at the standby position from the nozzle. The nozzle is intermittently ejected to discharge the adhesive, and when returning the nozzle to the working position, the tip of the nozzle is cleaned by a cleaning means provided in the movement path of the nozzle, and then the adhesive is removed. This is achieved by an adhesive supply method characterized by re-discharging onto an object to be coated.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The steps for adhering a magnetic sheet and a center core in the manufacture of a magnetic disk cartridge, which is an embodiment of the adhesive supply method according to the present invention, will be described below with reference to the drawings. FIG. 1 is a perspective view showing a main part of a fluid constant-volume discharge device used for carrying out the present invention, and the configuration of the entire device is shown in FIGS. 2 and 3. An apparatus for carrying out the adhesive supply method of the present invention is, for example, as shown in FIG.
The adhesive inside is pressurized by a pressure means 5 such as an air compressor, sent through a pressure piping system 3 to a dispenser 1 which is an adhesive discharge means, and is an object to be coated under the control of the control means 2. It is configured to be supplied to the flange portion on the outer periphery of the center core 6. That is, as shown in FIG. 3, the dispenser 1 has a swivel shaft 11 having a pressure-feeding conduit 11a which is an adhesive supply path in the dispenser 1 and is swivelably arranged in front of the nozzle 12 by a seal member 11b or the like. With this configuration, the supply of the adhesive from the pressure piping system 3 is controlled by controlling the turning of the turning shaft 11a by the control means 2.

The dispenser 1 having such a structure is
As shown in FIG. 1, it is connected to a dispenser moving means 7 via an arm 13, and the dispenser 1 is, for example, a final striking position E (an adhesive is applied to the center core 6 as a coating work position shown by a solid line in FIG. 1). It is provided so that it can be swung freely by moving between a supply position) and an idle driving position F, which is a standby position shown by a dotted line, which is deviated from the final driving position. Further, cleaning means 8 for cleaning the tip end portion of the nozzle 12 mounted on the dispenser 1 is arranged at a position on the moving path between the main striking position and the blank striking position. The cleaning means 8 is configured as, for example, a pig bristle brush 8a, but it may be configured as a sponge-like device containing a cleaning liquid or a spraying device containing a solvent.

The center core 6 is placed on a pallet 14 or the like on the transfer path 14a, for example, as shown in FIG. 1, and sequentially transferred in a specific direction (direction of arrow A). For example, on the turntable 15 for adhesive application ( 1 and FIG. 4), the required amount of the adhesive S is supplied from the nozzle 12 after being appropriately moved one by one. At that time, the turntable 15 for applying the adhesive is, for example, a motor 15
The center core 6 accurately aligned with the center of rotation of the table by being rotated by a rotating means such as b.
Is rotated, a predetermined amount of adhesive is applied to the flange portion 6a of the center core. The center core 6 coated with the adhesive is the turntable 15 for applying the adhesive.
Then, the magnetic sheet 9 is continuously conveyed in the same direction, and the magnetic sheet 9 is attached to the portion where the adhesive is applied by a device (not shown).

Next, an adhesive supply method using the above apparatus will be described. The center cores 6 placed on the plurality of pallets 14 are continuously conveyed by the above-mentioned device, and are conveyed to the coating work position E (final striking position) on the adhesive coating turntable 15. When it comes, this device
The turntable 15 starts rotating, and in synchronism with this rotating operation, the adhesive is discharged from the nozzle 12 onto the surface of the center core 6. And, for example, the center core 6
The adhesive is continuously applied to the center core 6 only while the
A fixed amount is discharged onto the flange portion of the core core, the discharge is interrupted when the rotation of the center core is completed, and the operation is waited at the work position (E) until the next center core discharge operation. Meanwhile, the center core 6 coated with the adhesive is transported to the next step because the magnetic sheet 9 is attached. Simultaneously with this carrying operation, the center core 6 placed on the next pallet 14 is being carried to the adhesive supply position, and the dispenser 1 is moved from the nozzle 12 to the adhesive in the same manner as the previous time. Is discharged.

During a repeating step of the above operation, when a mechanical failure occurs in the transport system of the center core 6 and the work is stopped for a predetermined time or longer, the dispenser 1 is moved by the moving means 7 to the final striking position (coating position). The intermittent ejection operation is performed such that the adhesive is ejected from the working position E) to a blanking position (standby position F), and the blanking operation of the adhesive is repeated, for example, 2 seconds of ejection and 30 seconds of ejection stop. . By performing this blanking operation, when the discharge of the adhesive from the nozzle 12 of the dispenser 1 is stopped, the curing of the adhesive at the tip of the nozzle 12 due to the evaporation of the solvent of the adhesive is prevented. It should be noted that the interval of this blank ejection is not limited to the above time, and can be set as appropriate depending on the type of adhesive, the structure of the nozzle, etc. In short, the interval is such that the adhesive does not solidify at the tip of the nozzle. I wish I could
If it can be set to be longer than the intermittent period at the time of final striking, waste of the adhesive can be avoided accordingly.

As described above, during the suspension of the bonding process, the adhesive ejection means is moved to the standby position and the blank ejection is performed to eject the adhesive from the nozzle of the adhesive ejection means. The hardening phenomenon of the adhesive can be prevented, and unnecessary blanking of the adhesive can avoid unnecessary consumption of the adhesive. Then, for example, when the mechanical failure of the transport system is recovered, the dispenser 1 returns to the main-positioning position and starts the main-bonding of the adhesive, but the tip of the nozzle 12 is disposed in the return path for cleaning. Since the means 8 moves while in contact with the means 8, it is possible to remove the deposits of the filamentous material formed by the adhesive pulling the thread from the tip of the nozzle by the above-mentioned blanking. In this way, when the main shot is restarted, the tip of the nozzle is cleaned by the cleaning means, so that the thread-like formation of the adhesive formed on the tip of the nozzle during the idle shot is removed. A normal adhesive can be supplied from the shot. Although the method of the present invention has been described by taking the method of manufacturing a magnetic disk cartridge as an example, the present invention is not limited to the above-described embodiment, and in the apparatus, for example, an adhesive supply system or an object to be coated. The transport system and the like can be changed as needed.

[0013]

As described above, according to the method of the present invention, since the adhesive supply means moves to the idle driving position to intermittently perform the idle driving during the stoppage of the machine, the tip of the nozzle. No teardrop-shaped cured product is produced. Further, since the tip of the nozzle is cleaned by the cleaning means when moving to the final striking position when the final striking is restarted, the string-like formation formed on the tip of the nozzle during the blank striking period is also removed. The normal adhesive supply can be performed from the first shot of the final hit. As a result, it is possible to avoid wasteful consumption of the adhesive and improve workability of the bonding process.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of an apparatus according to an embodiment of the present invention.

2 is an overall schematic diagram of the apparatus of FIG. 1. FIG.

FIG. 3 is a schematic view of a main part of the dispenser shown in FIG.

FIG. 4 is a schematic diagram showing adhesive supply to a magnetic sheet in the apparatus shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dispenser 2 Control means 3 Pressurizing piping system 4 Adhesive container 5 Pressurizing means 6 Center core 7 Dispenser moving means 8 Cleaning means 9 Magnetic sheet 11 Swivel axis 11a Pressure feed pipe line provided on the swivel axis 12 Nozzles

Claims (1)

[Claims] 1. An adhesive supply method for supplying the adhesive onto the object to be coated by an adhesive discharging means located above the transport path of the object to be coated and discharging the adhesive from a nozzle. When the adhesive discharge from the nozzle is stopped for a certain period of time or more, at least the nozzle is moved from the coating work position to the standby position and at the standby position, blank ejection is performed to discharge the adhesive from the nozzle, When returning the nozzle to the working position, the tip of the nozzle is cleaned by a cleaning means provided in the movement path of the nozzle, and then the adhesive is re-discharged to the object to be coated. Supply method.