JPH0433502B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides an adhesive supply device that sequentially heats and melts a hot-melt adhesive that is solid at room temperature and supplies it to an object to be adhered in predetermined amounts. Regarding.

(Prior art and its problems) Conventionally, when applying a hot-melt adhesive to an object to be bonded such as a plate-like object, the adhesive is heated and melted in an external tank and liquefied using a pump or the like. It is configured to be conveyed to a supply nozzle and injected and supplied from the supply nozzle by the conveyance force.

However, the above conventional configuration requires not only mechanical equipment such as an external melting tank and a transfer pump, but also equipment such as heating the tank and maintaining heat throughout the transportation route, making the entire equipment large-scale. There is a drawback.

In addition, when the adhesive is heated and melted in a tank, the top surface of the molten adhesive comes into contact with the air, which causes problems such as dust and air in the air getting mixed into the molten adhesive and reducing adhesive strength. ing.

For this reason, the present applicant installed a heating means for heating and melting the introduced adhesive in a cylindrical body equipped with an injection nozzle at the tip, and also set an operating position for engaging the adhesive and a retracting position for separating from the adhesive. A feeder member supporting a hook member that pivots between positions is installed so as to be slidable in the adhesive feeding direction, and a feeding means for reciprocating in the adhesive feeding direction is provided at one end of the hook member protruding outside the cylindrical body. When the feeding means is driven forward, the cord-shaped hot-melt adhesive is held between the hook members and moved forward together with the feeder member to be introduced, and when the feeding means is driven backward, the hook members are introduced. After swinging to the retracted position, it retreats together with the feeder member, leaving the hot-melt adhesive behind, and the pressure valve provided in the injection nozzle is activated by the introduction pressure of the hot-melt adhesive due to the forward drive of the feeding means. We proposed an adhesive supply device in which molten adhesive is extruded and supplied to the outside.

However, even with the structure described above, if the adhesive injection interval is long, the viscosity of the molten adhesive decreases due to long-term heating, and at the same time expands and increases the pressure, which causes the adhesive to pass through the opened pressure valve. The problem of natural leakage remains.

Furthermore, the heat of the heating means for melting the adhesive is conducted to the feeding mechanism, softening the adhesive within the feeding mechanism, and the hook member cannot hold the adhesive, making it impossible to advance the adhesive. Therefore, it also has the disadvantage that situations often occur in which the molten adhesive is not injected. Further, there is a problem that gas generated from the molten adhesive is ejected from the injection port during operation, and a predetermined amount of the molten adhesive is not injected.

(Objective of the Invention) In view of the above circumstances, an object of the present invention is to provide an adhesive supply device that can inject a predetermined amount of molten adhesive regardless of the length of the operation interval.

(Structure of the Invention) The adhesive supply device according to the present invention has a cord-shaped body inside a cylindrical body in which an inner cylindrical member for guiding a hot-melt adhesive is inserted into the outer cylindrical member, and an injection nozzle is provided at the tip. A predetermined amount of hot-melt adhesive is introduced by an introducing means, and the introduced adhesive is heated and melted by a heating means in a melting chamber provided in front of the injection nozzle to form a hot-melt adhesive. The supply device extrudes and supplies molten adhesive to the outside from an injection nozzle according to the amount of adhesive introduced, and the introducing means is slid in the hot-melt adhesive feeding direction between an outer cylinder member and an inner cylinder member. A movably interposed feeder member, an engaging claw protruding from the side of the tip, an operating position where the engaging claw engages the hot melt adhesive, and a retreat position where the engaging claw is released from the hot melt adhesive. A hook member is pivotally connected to the feeder member so as to be able to swing between the hook member and the inner cylinder member. an engaging member, a feeding means capable of reciprocating in the direction of feeding the hot-melt adhesive and connected to the hook member, and a reverse-feed prevention means provided on the inner cylindrical member to prevent the hot-melt adhesive from being fed backwards. The rear end is disposed between the outer cylinder and the inner cylinder, and the inner cylinder member leading to the feeder member and the melting chamber is slidably inserted through the melting chamber, and the front end is inserted into the melting chamber. A plunger that can open and close the injection port by fitting into the injection port of the nozzle and slidingly moving therein, and a reciprocating drive means that is connected to the rear end of the plunger and drives the plunger to slide. The introducing means swings the hook member to the operating position by forward driving of the feeding means, engages the hot-melt adhesive between the engaging member, and causes the hook member to swing. By forward driving of the feeding means after the rotation is regulated, the hot melt adhesive held in engagement with the hook member and the feeder member are integrally driven to move in the hot melt adhesive feeding direction, By the backward drive of the feeding means, the feeder member swings to the retracted position and the heat-melt adhesive is disengaged, and then the heat-melt adhesive is prevented from being reversely fed by the reverse-feed prevention means. The hook member and the feeder member retreat to a predetermined initial position, leaving the adhesive behind, and the feeding means is driven forward and backward to introduce a predetermined amount of hot-melt adhesive, and the reciprocating drive means drives the plunger to move. The structure is such that the molten adhesive is extruded and supplied to the outside from the injection nozzle by opening and closing the injection port.

Furthermore, in addition to the above configuration, a space is formed between the inner cylinder member and the outer cylinder member between the introduction means and the heating means, and air is forced to flow into the space to prevent air from the heating means. It is constructed to prevent the heat-melting adhesive on the introduction means side from softening due to heat.

(Example) The first and third illustrated adhesive supply devices each have a cylindrical shape that introduces and melts a predetermined amount of hot-melt solid adhesive x formed into a cord shape and wound around an external reel (not shown). It is composed of a main body part 10 and a nozzle part 20 that injects the adhesive introduced and melted into the cylindrical main body 10 to the outside of the apparatus. and a heat-melting section 200 for introducing adhesive.

The introduction mechanism section 100 includes an inner cylinder 102 serving as an introduction path for the solid adhesive x into the introduction outer cylinder 101 and a guide inner cylinder 103 connected thereto.
1 and concentrically with this guide inner cylinder 1.
A slide piece 120 and a slide sleeve 104 are interposed between 03 and the introduction section outer cylinder 101 so as to be slidable in the axial direction.

The slide piece 120 has a lever protrusion 120a protruding outside the outer cylinder connected to an air cylinder 121 fixed to the introduction outer cylinder 101, and a plunger 1 whose front end fits into the injection port 21a of the nozzle 21.
The rear end of 22 is connected and fixed to the front end surface,
Plunger 12 is driven by air cylinder 121.
2 moves in the axial direction to open and close the injection port 21a.

The plunger 122 has a linear diameter that is slidably fitted to the injection port 21a at the tip of the nozzle 21 with a predetermined tolerance, and passes vertically through the slide sleeve 104 and then vertically through the joint inner cylinder 302 to enter the heater. It enters into the melting chamber 202d of the cylinder 202 and is slidably fitted into the injection port 21a of the nozzle section 20.

A lever 105 is pivotably supported on the slide sleeve 104, and the lever 105
Air cylinder 10 fixed to introduction part outer cylinder 101
8 via a link 107, the lever 105 swings when driven by an air cylinder 108, and holds the adhesive x between it and the lever receiver 106 fixed to the opposite position of the slide sleeve 104. The slide sleeve 104 is moved forward, and the adhesive x is introduced and moved forward accordingly.

An annular boss portion 11 is provided at the upper end of the introduction portion outer cylinder 101.
0a to fix the guide cap 110, and insert the upper end of the inner cylinder 102 into the annular boss portion 110a, thereby inserting the inner cylinder 1 into the introduction section outer cylinder 101.
02 is installed. And guide cap 1
A guide hole 110b having a diameter larger than the diameter of the adhesive by a predetermined amount is opened in the center of the guide hole 102 to communicate with the inside of the inner cylinder 102.

The slide sleeve 104 has a cylindrical shape whose outer diameter is slidably fitted to the inner diameter of the introduction section outer cylinder 101 and the inner diameter is slidably fitted to the outer diameter of the guide inner cylinder 103, and the plunger through hole 104c is vertically fitted in a predetermined position. A slit 1 that penetrates and is diametrically opposed on the lower end side.
04a, 104b, and the slit 104
A lever 105 is rotatably supported on one side 104a of 104a and 104b, and a lever receiver 10 is supported on the other side 104b.
It is formed to fix 6.

The lever 105 has a plurality of triangular engagement protrusions 105a formed on one end of the plate, and the other end thereof is cut out in a stepped manner to form the end surface as an abutting surface 105b with the slide sleeve 104. 105a are fitted into the slits 104a of the slide sleeve 104 with the ends facing inward (adhesive side) and are rotatably supported. When rotated inward, the engaging protrusions 105a project into the guide inner cylinder 103 through the slits 103a formed in the inner cylinder guide 103, and the abutting parts 105b abut against the outer surface of the slide sleeve 104 in the outward direction. The engaging protrusions 105a are configured to rotate until they come into contact with each other, and at this time the engaging protrusions 105a are retracted to the outside of the guided inner cylinder 103. Further, a lever 105 protrudes from a notch 101a provided in the introduction section outer cylinder 101.
A drive shaft 108a of an air cylinder 108 fixed parallel to the introduction section outer cylinder 101 is connected to the tip via a link 107, and the lever 105 is configured to be swingable when the air cylinder 108 is driven.

The lever receiver 106 has a plurality of convex portions 106a formed on one of the long sides of a rectangular plate.
The slide sleeve 104 is formed by directing the convex portions 106a toward the inside (adhesive side) through the slit 103b of the guide inner tube 103, and by causing the upper surface of the convex portions 106a to protrude inward by a predetermined amount from the inner surface of the guide inner tube 103.
is inserted and fixed into a slit 104b facing the lever 105.

With this configuration, when the air cylinder 108 is driven forward, the lever 105 first swings around the pivot point with the slide sleeve 104, and the engaging protrusions 105a protrude into the guide inner cylinder 103 to release the adhesive. x to the convex portion 10 of the lever receiver 106
When pressed against 6a, they engage and become unrotatable. In this state, the adhesive x and the lever 105 slide forward together with the slide sleeve 104. That is, the adhesive x is engaged with the air cylinder 108 at the initial stage of its forward stroke, and the adhesive x is advanced together with the slide sleeve 104 during the subsequent stroke.

Sensor 10 provided on air cylinder 108
8c... is detected and the forward stroke ends, and the lever 105 swings in the opposite direction to the forward stroke and the adhesive x
are released from the pressing and engagement with the lever receiver 106, and the engagement protrusions 105a... are retracted to the outside of the guide inner cylinder 103. Then, the abutment surface 105b of the lever 105 abuts against the outer surface of the slide sleeve 104 and becomes unrotatable, causing the slide sleeve 104 to retreat. That is, in the initial part of the backward stroke, the engaging protrusion 105
a retreats to the outside of the guide inner cylinder 103 to release the engagement of the adhesive x, and the slide sleeve 104 retreats to the drive start position, leaving the adhesive x behind.

Note that when the slide sleeve 104 is retreated, the engagement with the convex portions 106a of the lever receiver 106 is not completely released, and the adhesive x is applied to the slide sleeve 104.
In order to prevent the tape from moving backward at the same time, a reverse feed stopper 113 is installed, the base end of which is fixed to the inner tube 102, and the tip of which contacts the adhesive through the slit 102a.

Furthermore, when the operating resistance of the slide sleeve 104 is too light, the slide sleeve 104 slides in a natural fall manner as the air cylinder 108 is driven forward, and the adhesive x cannot be engaged with the adhesive x. A situation occurs where forward drive is not possible. For this reason, the brake shoe 111 is configured to be pressed against the outer surface of the slide sleeve 104 from the outside by a wire spring 112 through the brake hole 101a opened in the sliding portion of the slide sleeve 104 of the outer cylinder 101, and the appropriate A reliable engagement with the adhesive X is achieved by adding operational resistance.

The heating and melting section 200 has an introduction mechanism section 100 at the upper end.
Heating part outer cylinder 2 to which the lower end of the introduction part outer cylinder 101 is screwed together.
01, a heater inner cylinder 202 connected to the guide inner cylinder 103 of the introduction mechanism section 100 via a joint inner cylinder 302, and a heater 203 installed between the heating section outer cylinder 201 and the heater inner cylinder 202. ,
Introduced by the introduction mechanism section 100, the inner cylinder 102.
The solid adhesive x moving forward within the guide inner cylinder 103 is heated and melted within the heater inner cylinder 202.

The heating part outer cylinder 201 has an introduction part outer cylinder 1 on the inner periphery of the upper end.
01 is formed, and two cooling air inflow holes 201b, 201 are provided at predetermined positions on the side.
b, an introduction hole 201c for a power cord, a temperature sensor lead wire, a ground wire, etc., and a fixing flange portion 201a is formed with a part of the outer periphery having a large diameter.

The joint inner cylinder 302 has a substantially cylindrical shape with an inner diameter larger than the diameter of the adhesive X by a predetermined amount, and an outer diameter of the joint inner cylinder 302 from the upper end to the inner diameter of the introduction part outer cylinder.
a. Large diameter portion 302 that fits into the inner diameter of the heating unit outer cylinder
b. A small diameter portion 3 having a predetermined distance from the inner diameter of the heating section outer cylinder.
02c, and a fitting part 302d that fits into the fitting part 202a at the upper end of the heater inner cylinder 202 at the lower end, and a cooling air circulation groove 302e with a partially small diameter is formed in the center of the large diameter part 302b. has been done.
Further, a plunger through hole 302f is vertically penetrated from the upper end surface toward the center of the lower end surface. It is made of a soft resin that has high heat resistance and heat insulation properties.

The heater inner cylinder 202 is made of a copper alloy with good thermal conductivity, has an inner diameter part as a melting chamber 202d for the adhesive x, a fitting part 202a into which the joint inner cylinder 302 fits at the upper end, and a nozzle 22 at the lower end. In addition to forming engaging portions 202b to be screwed together, a heater installation portion 202c is formed by making the outer diameter of the intermediate portion smaller. Then, the heater 203 is attached to the heater installation part 202c through upper and lower washers 204 and 205 made of a soft resin with high heat resistance and heat insulation properties, and the lower washer 205 has a small diameter at the lower end of the heating section outer cylinder 201. It is installed in the heating section outer cylinder 201 so that the engaging section 202b protrudes downward by engaging with the stepped section.

Therefore, the fitting part 202 at the upper end of the heater inner cylinder 202
Insert the joint inner cylinder 302 into a, screw the introduction part outer cylinder 101 into the heating part outer cylinder 201, and then remove the inner cylinder 10.
2. The guide inner cylinder 103, the joint inner cylinder 302, and the heater inner cylinder 202 communicate in series in the axial direction and are tightened and fixed as one body, so that the cylindrical main body portion 10 is integrally constructed. Also, plunger 12
2 protrudes to the lower side of the introduction mechanism section 100 through the through hole of the slide sleeve and connects to the joint inner cylinder 302.
is inserted into the plunger through hole 302f, enters the melting chamber 202d of the heater inner cylinder 202, and reaches below the engaging portion 202b of the heater inner cylinder 202.

The nozzle part 20 is attached to the engaging part 202b of the heater inner cylinder 202 that protrudes from the lower end of the heating and melting part 200.

The nozzle section 20 connects the nozzle 21 to the heater inner cylinder 202 via the large diameter section 22a of the plunger guide 22.
It is configured to be fastened to the engaging portion 202b of.

The nozzle 21 has an engaging part 21b screwed into the engaging part 202b of the heater inner cylinder 202 at the upper end, and the tip of the plunger guide 22 fits into the inner diameter of the small diameter part at the lower end. Exit 21a
It is composed of

The plunger guide 22 includes a thin large diameter part 22a at the upper end and a small diameter part 22b that fits into the small diameter part at the lower end of the nozzle 21, and the large diameter part 22a has a plurality of molten adhesive passage holes 22e... Holes are drilled through the top and bottom. Also, there is a plunger 1 in the center.
22 guide holes 22c are opened, and cross-shaped slits 22d, 22d are formed at the tip of the small diameter portion 22b, and serve as flow paths for the molten adhesive.

Thus, the plunger 122 is inserted into the guide hole 22c at the center of the plunger guide 22, and the plunger guide 22 is inserted into the small diameter portion of the lower end of the nozzle 21.
The tip of the small diameter portion 22b of the plunger 122 is fitted, and the plunger guide is fixed inside the nozzle 21.
The tip of the nozzle 21 is configured to fit into the injection port 21a of the nozzle 21 and protrude outward by a predetermined amount to close the injection port 21a.

The entire nozzle portion 20 is covered with a heat insulating material 25 to prevent heat from dissipating.

In the adhesive supply device configured integrally as described above, the air cylinder 108 is driven after the cord-shaped adhesive When the introduction stroke is repeated, the adhesive x advances as described above and reaches the inside of the heating melting section 200. The adhesive x is melted by the heat applied in the heating and melting section 200, and as the introduction stroke is repeated, the nozzle section 20 is filled with it.

When an introduction stroke is performed in this state, pressure is applied to the molten adhesive in the melting chamber 202d and the nozzle portion 20 due to the introduction of the adhesive X. When the pressure reaches a predetermined pressure, it balances with the introduction stroke pressure of the air cylinder, making the introduction stroke impossible and stopping.

When the air cylinder 121 is operated at a predetermined timing and the plunger 122 is driven to open the injection port 21a, the molten adhesive is injected from the injection port 21a due to the applied pressure. By controlling this opening time, the injection amount of the molten adhesive can be controlled.

When molten adhesive is injected, the introduction stroke is activated by the pressure drop due to injection, and the melting chamber 2
02d and the pressure of the molten adhesive in the nozzle section 20 are always kept constant. That is, the injection pressure is always constant, and the amount of adhesive X corresponding to the amount of the injected molten adhesive is introduced by the introduction mechanism section 100 along with the injection.

Also, the cooling air inflow hole 201 of the heating section outer cylinder 201
b, 201b, compressed air from a compression mechanism such as a compressor (not shown) is passed through a cooling air circulation structure 302e between the heating section outer cylinder 201 and the joint inner cylinder 203.
The heat melting section 200 is forcibly cooled so that the heat of the heating melting section 200 is not conducted to the introducing mechanism section 100.

In addition, to attach to the equipment to be installed, insert the heating melting part 200 at the tip into the mounting hole 1a made in the machine frame 1 of the equipment to be installed, and then insert the heating part 200 through the fixing flange 201a formed on the heating part outer cylinder 201. The fixing plate 2 is installed by being tightened and fixed to the machine frame 1 from above.

(Effects of the Invention) The adhesive supply device according to the present invention is configured to constantly press the adhesive forward to apply pressure to the molten adhesive, and is configured to mechanically open and close the injection nozzle. Therefore, even if the injection interval is long, gas generation from the molten adhesive can be prevented, and the molten adhesive will not leak out.

Furthermore, the joint between the heating means and the introduction means is forcibly cooled to prevent heat from being transferred from the heating means to the introduction means, and the adhesive is prevented from softening within the introduction means, thereby ensuring reliable adhesive bonding. This allows for clamping and introduction.

[Brief explanation of drawings]

FIG. 1 is a longitudinal view showing an embodiment of an adhesive supply device according to the present invention, and FIG. 2 is an enlarged sectional view of a nozzle portion. 10... Cylindrical main body, 21... Nozzle (injection nozzle),
21a...Injection port, 100...Introduction mechanism part (introduction means), 101...Introduction part outer cylinder (outer cylinder member), 102...
Inner cylinder (inner cylinder member on the side where the hot-melt adhesive is introduced from the feeder member), 103... Guide inner cylinder (inner cylinder member), 1
04...Slide sleeve (feeder member), 10
5... Lever (hook member), 106... Lever receiver (engaging member), 108... Air cylinder (feeding means),
113... Reverse feed stopper (reverse feed prevention means), 1
21...Air cylinder (reciprocating drive means), 122...
Plunger, 200... heating melting part (heating means),
201... Heating part outer cylinder (outer cylinder member), 202d... Melting chamber, 302... Joint inner cylinder (inner cylinder member leading to the melting chamber), 302e... Cooling air circulation groove (space part).

Claims (1)

[Scope of Claims] 1. A hot-melt adhesive formed into a cord shape in a cylindrical body having an inner cylinder member for guiding the hot-melt adhesive inserted into the outer cylinder member and an injection nozzle at the tip. is introduced every predetermined amount by an introduction means, and the introduced adhesive is heated and melted by a heating means in a melting chamber provided in front of the injection nozzle, and the amount of the hot-melt adhesive introduced is The supply device extrudes and supplies molten adhesive from the injection nozzle to the outside, wherein the introduction means is interposed between the outer cylindrical member and the inner cylindrical member so as to be slidable in the hot-melt adhesive feeding direction. an engaging claw is provided on the side of the distal end thereof, and an operating position where the engaging claw engages with the hot melt adhesive and a retracted position where the engaging claw is released from the hot melt adhesive. a hook member pivotably attached to the feeder member so as to be able to swing between the two; and a position of the feeder member facing each other across the hot-melt adhesive guided by the hook member and the inner cylinder member. an engaging member provided on the inner cylindrical member; a feeding means capable of reciprocating in the hot-melt adhesive feeding direction and connected to the hook member; and a reverse feed prevention means for preventing reverse feed, the rear end of which is disposed between the outer cylindrical member and the inner cylindrical member, and is configured to slide the inner cylindrical member leading to the feeder member and the melting chamber. a plunger which is movably inserted into the melting chamber and whose front end fits into the injection port of the injection nozzle and which can open and close the injection port by sliding movement; and a reciprocating drive means connected to each other to drive the plunger in a sliding motion, and the introduction means is configured to swing the hook member to the operating position by the forward drive of the feeding means, and to move the hook member into the engagement position. After the hot-melt adhesive is engaged with the member and the swinging movement of the hook member is regulated by the engagement, the hook member and the engagement are maintained by forward driving of the feeding means. The hot-melt adhesive and the feeder member are integrally driven to move in the hot-melt adhesive feeding direction, and the hook member is swung to the retracted position by the backward drive of the feeding means. The hook member and the feeder member are moved to a predetermined initial stage, leaving the heat melt adhesive which is prevented from being reversely fed by the reverse feed prevention means. The reciprocating driving means moves the plunger to open and close the injection port to melt the adhesive. An adhesive supply device characterized in that the adhesive is configured to be extruded and supplied to the outside from the injection nozzle. 2 forming a space between the inner cylinder member and the outer cylinder member between the introduction means and the heating means;
Claim 1, characterized in that the adhesive is configured to forcefully flow air into the space to prevent the heat-melting adhesive on the introduction means side from softening due to heat from the heating means. Adhesive supply device as described in Section 1.