JPH05213308A - Binding head of thermoplastic band - Google Patents

Abstract

PURPOSE:To make the action schedule of entire binding head including a band bonding optionally changeable and selectable, and easily and simply perform maintenance of parts of the binding head by providing a heating plate welding mechanism by which a heating plate is smoothly, certainly inserted in between bands to be bonded and the faces of the bands are adequately pressed on to the heating plate and the molten bands are firmly press-bonded. CONSTITUTION:A heating plate welding mechanism 20 of a welding mechanism 10 has a cylinder capable of alternatively performing weak pressing in which a piston is pushed out by a spring and strong pressing by compressed air, so that bands are brought in close contact with a heating plate 21 to melt them, and certainly press- bonded by strongly pressing them after the heating plate 21 is removed. A band separating guide and a band guide cylinder 24 are provided to insert the heating plate 21, and the band separating guide 23 is retracted as the heating plate 21 moves forward and the heating plate 21 and the band separating guide 23 move between the bands to be bonded so that the heating plate 21 is smoothly, certainly inserted. A sequential circuit and a solenoid valve are employed as a controller and a grip mechanism is composed of the lower face of a fixed cutter of a shear mechanism and an openable gripper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a binding head of an automatic binding machine which wraps an article using a thermoplastic band and tightens it to weld and bind a superposed portion.

[0002]

2. Description of the Related Art Conventionally, it has been often practiced to use a thermoplastic band (hereinafter, simply referred to as a band) for bundling an article and utilizing it as a convenient mode for handling, storing, and transporting the article. A hot plate welding type bundling capable of performing the zone overlap welding has been widely applied. For example,
As can be seen in Japanese Utility Model Publication No. 53-6713, Japanese Patent Publication No. 54-34394, and Japanese Utility Model Publication No. 1-164106, each of them has brought about a certain effect while making improvements. In regard to the band binding machine or the band welding device thereof, there were various problems in terms of hot plate insertion type or maintenance, and operation control.

[0003] That is, the joint fixing integration of the heating plate and the tape guide body in Japanese Utility Model Publication No. 53-6713 seems to facilitate the inter-band insertion of the heating plate, but the heating plate thicker than the band gap. However, the insertion is not always smooth because it is inserted (contact is made close after insertion), and there is a problem that the heat capacity of the hot plate is limited and the moving stroke is lengthened.

Also, as in Japanese Patent Publication No. 54-34394 and Japanese Utility Model Laid-Open No. 1-164106 (the same is true of Japanese Utility Model Publication No. 53-6713), various operation timing control including welding operation is performed by a cam mechanism. However, this requires a change in the cam shape in order to change the band melting time, the pressure bonding time, etc. due to changes in the band thickness, band width, etc., which is a problem that cannot be easily implemented. Furthermore, in the maintenance of shearing devices, hot plates, grip devices, etc. (these devices have a relatively high maintenance frequency), there is the complexity of disassembling and assembling the devices, and at the same time responding to dimensional changes due to repairs, etc. It was difficult to adjust the synchronization with the cam.

[0005]

SUMMARY OF THE INVENTION In view of the above situation, the present invention smoothly and surely inserts a hot plate having a necessary and sufficient amount of heat between the superposition zones, and at the same time, to the hot plate of both sides. It is equipped with a hot plate welding mechanism that achieves the proper adhesion of the melted band and the firm bonding of the melted zone, and the operation schedule of the whole binding head including band welding can be arbitrarily changed and selected. The present invention has been accomplished by earnest research and trials by the present inventors in order to provide a binding head that enables easy and easy maintenance of plates, shears, grippers, and the like.

[0006]

The present invention has dealt with by applying the following means in order to solve the above-mentioned problems.

That is, in the hot plate welding mechanism of the welding device, an air cylinder with a built-in spring, in other words, the first air chamber and the second air chamber are opened, and a weak pressure is applied by the spring provided for urging the piston. Then, the hot plate contact surfaces on the upper and lower sides of the polymerization zone are properly contacted to the hot plate, and then compressed air is introduced into the first air chamber to apply strong pressure and to apply strong pressure to the melting zone. A pressure cylinder was attached to achieve the wear.

Further, regarding the forward / backward movement of the strip separation guide for smoothing the insertion of the hot plate between the overlapping zones, only the forward movement is air-operated, and the backward return is driven (free) by attaching a strip guide cylinder. The separation guide is moved forward, a hot plate insertion cylinder that can move forward and backward is attached to the hot plate, and the shape of the hot plate tip and the band separation guide tip can be contacted and engaged.
When both the cylinders are operated cooperatively and the hot plate is inserted between the upper and lower bands after the band superposition, the hot plate is advanced by the advance of the hot plate insertion cylinder and is brought into contact engagement with the band separation guide. While the band separation guide is being retracted, the hot plate itself achieves smooth and easy insertion between the upper and lower bands and the band separation guide is restored.

Further, a sequencer and an air cylinder for each device which operates based on a solenoid valve are provided as a control device for controlling the operation of each device, and it is extremely easy to change and select the operation timing of each device and mechanism of the binding head. It was configured so that

In addition, a grip mechanism is provided with the lower surface of the fixed cutter of the shear mechanism and an openable / closable gripper, and a two-stage cylinder for operating both the gripper opening / closing and the movable cutter of the shear mechanism in a timely manner is attached.
As a result, the base plate and the grip mechanism are separated from each other to form a grip shear device, which facilitates attachment / detachment and maintenance.

[0011]

The operation of the thermoplastic band binding head of the present invention (hereinafter simply referred to as the present binding head) will be briefly described.

When the hot plate is inserted into the band overlapping portion which is separated by the band separating guide for easily inserting the hot plate, the hot plate having substantially the same thickness as the band separating guide is placed at the same position and at the same height level. Since the hot plate itself enters between the superposition zones while advancing and pressing the strip separation guide to move it backward, the hot plate can be inserted very easily. At this time, no tension is applied to the band overlapping part (the tension of the article orbital band is maintained between the gripper and the clamp), which facilitates the facilitation of hot plate insertion. Therefore, the power for pulling back the band separation guide to restore it is unnecessary, and the return process of the band guide cylinder is free and driven.

When the heating plate is arranged in the band overlapping portion, the pressurizing cylinder opens the first air chamber and the second air chamber, thereby exerting the biasing force of the spring and lightly pressing the piston of the cylinder. As a result, the pressurizer softly presses the polymerization zone in contact with the upper and lower surfaces of the hot plate. At this time, the strip on the lower surface supports the base, so that the hot plate is mounted so as to allow some driven vertical deflection. When the surfaces to be welded to each other in the zone overlap portion are melted by the hot plate, the hot plate moves away (due to the backward return of the hot plate insertion cylinder), and the pressurizing cylinder here passes compressed air into the first air chamber. It is put in and the piston is strongly pressed, and the pressurizer strongly presses the molten zone to weld it. In this way, the pressure system, which uses pressure depending on the strength of the pressure cylinder spring and air pressure, has a great effect.

Since the whole binding head having the air cylinders of the respective devices which individually operate based on the sequencer and the solenoid valve is a so-called individual control sequential operation, it is possible to easily change the operation schedule and the operation timing by changing the sequencer. Has become.

The grip mechanism does not exert a grip effect in correspondence with the base as in the conventional case, and grips and grips the front end of the band between the lower surface of the fixed cutter of the shear mechanism and the movable gripper regardless of the base. The thing
This means checking and maintaining the binding head,
The shear device is easily attached and detached.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a front view of the present binding head 1, FIG. 2 is a side view thereof, FIG. 3 is a front partial sectional view taken along the line BB of FIG. 2, and FIG. 4 is taken along the line AA of FIG. A side cross-sectional view is shown in FIG. 5, and a horizontal cross-sectional view taken along the line CC in FIG. 4 is shown in FIG.
Is a welding tightening device 60, a welding device 10 including a base mechanism 40,
A grip / shear device 50, a face gate 70, etc. are attached to the frame 5 of the head. Further, although not shown here, a control device 80 is provided and mounted on an automatic binding machine (not shown). There is.

The welding apparatus 10 includes a hot plate welding mechanism 20 and a clamping mechanism, as will be better understood by referring to FIGS. 3 and 4 and a partial front sectional view of FIG. 6 shown as a detailed view and a partial side sectional view of FIG. 30 and the base mechanism 40 are included.

The hot plate welding mechanism 20 includes a hot plate 21 having a nichrome wire stored therein, and the hot plate 21 is inserted between the superposed bands and the band separation guide 23 is pushed to return and return the hot plate 21. It has a hot plate insertion cylinder 22 for returning the post-hot plate 21 itself to the backward return, and connects the two at a hot plate mounting portion 29. Fig. 10 shows a partial detailed view of the hot plate mounting part 29. A mica plate 295 is placed on the upper and lower surfaces of the hot plate 21 to insulate the heat, and a spring 292 is fitted to apply pressure to the overlapping zone of the hot plate 21. The mounting bolts 291 are fixed so that they can be displaced at a slight mounting angle while paying attention to the displacement when moving.

On the other hand, a band separation guide 23 is provided in the overlapping portion of the band 90 to form a band gap for inserting the hot plate 21, and a band guide cylinder for advancing the band separation guide 23 to align with the band line. 24 is also provided and is connected to the band separation guide 23. This band guide cylinder 24 is only for forward movement, and for backward return, as described above, it is made by pressing force by the forward movement of the hot plate 21, and the band separation guide 23 and the hot plate 21 are
At this time, as if they were one, they move together with the band overlapping portions, and the heat plate 21 is extremely easily inserted between the band overlapping portions, so that the backward separating power unique to the band separating guide 23 is unnecessary. is there. The tip of the heating plate 21 and the tip of the band separation guide 23 are shaped so as to facilitate contact with each other.

Further, the pressure cylinder 25 is subjected to soft pressure bonding of the superposition zone 90 to the hot plate 21 and fusion zone pressure after leaving the hot plate 21 by means of a pressure element 26 provided at the tip end via a pressure arm 27. For the pressurizing cylinder 25, a detailed sectional view of the pressurizing cylinder 25 is shown in FIG.
The spring 252 is fitted in the first air chamber 253 including the inner cavity of 251 to open the ventilation hole 255 of the first air chamber 253 and the ventilation hole 256 of the second air chamber 254, and the piston 251 is urged by the spring 252. Lightly press down to operate to pressurize the above-mentioned pressurizer 26 slightly, and to let compressed air flow from the vent hole 255 into the first air chamber 253 while keeping the vent hole 256 of the second air chamber 254 open. The piston 251 is configured to output a strong pressing force and act on the pressurizer 26 by acting as an original air cylinder. When the piston 251 is returned, compressed air is introduced into the second air chamber 254 through the ventilation hole 256 and then the first air chamber 254.
Vent hole 255 of 253 is opened and exhausted. The pressure arm 27 has a Duracon 28 made of acrylic resin loaded therein, and serves as a support and guide for the frame 5.

The clamp mechanism 30 is composed of a clamp 31 and a clamp cylinder 35 that can move the clamp 31 up and down. The clamp mechanism 30 is in contact with the hot plate welding mechanism 20 and is attached to the opposite side of the grip shear device 50. .. The tip of the clamp 31 engages with the clamp recess 42 provided on the upper side of the base 41 of the base mechanism 40 to clamp the band 90. This clamp operation tightens the band 90 that circulates the article to apply tension. When
This is carried out at the necessary and possible maximum position of the circumscribing and tightening band 90, and is for ensuring reliable melting and subsequent welding by using the polymerized portion as no tension with respect to the melted portion. It is to be noted that FIG. 9 illustrates a state in which the band 90 cooperates with the base 41 and the clamp 31 clamps.

The base mechanism 40 includes a base 41 having a clamp recess 42, as best seen in FIGS. 6 and 7 and 9.
And a band guide cylinder 24 attached thereto and a band separation guide advanced by the band guide cylinder 24.
Along with 23, it is configured with a base cylinder 45 as a power for aligning with the strip line and moving out.

The grip shear device 50 is shown in detail in FIG.
11 is a front sectional view, and FIG. 12 is a side sectional view. The grip shear cylinder 55 (see FIG. 2 for the two-stage operation configuration) allows the grip mechanism of the first stage operation via the link 58. Pull up the gripper 51 and fix the cutter
It is configured to grip the tip of the band 90 between the lower surface of 56 and the second stage operation so as to push down the moving cutter 57 and cooperate with the fixed cutter 56 to cut the excess band. There is. This grip / shear device 50 is surrounded by side plates 53, 53 and has a gripper 51 formed in a jaw form via an arm 59 and a link 58 inside, while a movable cutter 57 and a fixed cutter 56 are attached. Then, it is connected to the grip / shear cylinder 55 with a pin 52, and a link 58 enables the operation in the 90 → displaced direction.
By pulling out the pin 52, the grip shear device 50 can be easily removed from the bottom surface as an integral block. (See Figure 12)

The feeding / tightening device 60 is of the same type as that applied to a widely known steel band binding head, and can be said to be publicly known with a slightly reduced output.
The motor 68 as a power source is electric in the embodiment, but an air motor may be applied. The transmission 65 controls the speed and rotation output. Further, the feeding and tightening mechanism 59 is configured to include a reduction gear, a drive roll and the like.

The face gate 70 is almost the same as that applied to a binding head using a steel strip which is already known, and although detailed description will be omitted, it is closed by the high rotor 75 when the strip 90 is fed and when tightened. It opens.

The control device 80 is basically different from the conventional cam control, and as shown in FIG. 13, a solenoid valve 85 for each device mechanism combined with a sequencer (not shown).
A pressure reducing valve 86 provided if necessary is connected to each air cylinder, the high rotor 75, and the transmission 65 to form an air circuit to control each device mechanism. As a result, the operation schedule of each device can be easily changed, and the control operation becomes reliable. This control device is also applicable to a friction welding type binding head.

The operation of the present binding head will be described. First, an automatic binding machine (not shown) equipped with the binding head 1
A band 90 sent out from the feeding and tightening device 60 of the binding head 1 passes through the band guide frame of the binding machine around the to-be-bound object placed on the. By the reverse pull-back operation of the feeding / tightening device 60, the belt 90 is removed from the belt guide frame and the article is brought into a circuit-contact state. Prior to the feeding / pulling back of the band 90, the base 41 is aligned with the band line by the base cylinder 45, and the band separation guide 23 is aligned with the band line by the band guide cylinder 24. Therefore, the band 90 passes through the band separation guide 23 and advances along the band guide frame to form an annular shape, and the tip of the band 90 advances to the band separation guide 23 to form a superposed portion, and the front end of the band (slightly rearward of the band superposed portion) Position) is gripped between the gripper 51 of the grip shear device 50 and the fixed cutter 56 by the first-stage operation of the grip shear cylinder 55, the hot plate 21 of the hot plate 21 to be inserted is eventually inserted in the band overlapping section. The insertion gap for this is formed and secured. Thus, the band 90 is strongly tightened by the feeding and tightening device 60, the clamp 31 is pushed down by the operation of the clamp cylinder 35, and the band 90 cooperates with the clamp recess 42 of the base 41.
Where the moving cutter 57 is pushed down by the second-stage operation of the grip shear cylinder 55 and cooperates with the fixed cutter 56 to cut the excess band, and thus the tightening force of the circumscribing tightening band 90. Is supported by the gripper 51 and the clamp 31, and the band overlapping portion is in a tensionless state.

Thus, the hot plate 21 is moved forward by the operation of the hot plate insertion cylinder 22, contacts the band separation guide 23, and the hot plate 21 itself is superposed while pressing the band separation guide 23 while pressing the band separation guide 23. It is inserted between the bands 90 and inserted.
Thus, with respect to the hot plate 21, the first air chamber 253 of the pressurizing cylinder 25
, The second air chamber 254 has respective vent holes 255 and 256 opened, and the pressurizing element 26 which supports the base 41 by the urging force of the spring 252, presses the superposition zone 90 lightly through the hot plate 21, The hot plate 21 that has been preheated melts the contact surfaces of the upper and lower bands that have come into contact and are appropriately adhered. After proper contact with the hot plate 21,
The hot plate 21 is moved back from the melt polymerization zone by the operation of the hot plate insertion cylinder 22 and returns. Here, the above-mentioned state of no tension in the polymerized portion provides a very preferable state for melting and pressure bonding of the polymerized zone. This is because the technical aspect is based on appropriate consideration so as not to cause extensional deformation of the fusion zone of the strip. Thus, in the pressurizing cylinder 25, compressed air is introduced into the first air chamber 253 from the vent hole 255 to strongly push down the piston 251, and the polymerized zone melted by the pressurizer 26 is strongly pressed and welded. Thereafter, the pressurizing cylinder 25 is actuated to return the pressurizer 26 to the ascending position, the clamp cylinder 35 to ascend and return the clamp 31, and the base cylinder 45 causes the base mechanism 40 to retreat. .. In this way
The binding head 1 is separated from the object to be bound, the object to be bound becomes free, and is sent to the next step as a solid bound body.

The operation of each device and mechanism of the above binding head 1 is based on the control of the sequencer which is the source of the control and the control device 80 including each air cylinder which operates based on the solenoid valve 85 connected thereto. Is done.

[0030]

The following effects are achieved by the practice of the present invention, which greatly contributes to the development of an automatic binding machine using a thermoplastic band. (1) Depending on the strength and weakness of the cylinder, the function of the cylinder is to achieve uniform, reliable and strong welding of the band overlapping portion, and to enhance the quality assurance of band binding. (2) A hot plate having a sufficient heat capacity is inserted into the overlapping portion of the strip in an extremely smooth and fast manner, and welding that does not cause operational troubles is achieved. (3) The operation sequence and operation timing of the binding head are
Since it can be reassembled or selected very easily, it can quickly respond to all welding conditions, and the range of utilization of the band-type automatic binding machine is increased. (4) Inspection and maintenance of the binding head can be carried out very easily, and accuracy of the automatic binding machine can be maintained and improved.

[Brief description of drawings]

[Summary] All the drawings show embodiments of the present invention.

FIG. 1 is a front view of the present binding head.

FIG. 2 is a side view of the present binding head.

3 is a front partial cross-sectional view of the present binding head taken along the line BB of FIG.

4 is a partial side sectional view of the present binding head taken along the line AA of FIG.

5 is a cross-sectional view of the present binding head taken along the line CC of FIG.

FIG. 6 is a front partial cross-sectional view of the welding device.

FIG. 7 is a partial side sectional view of the welding device.

FIG. 8 is a front sectional view of a pressure cylinder.

FIG. 9 is an explanatory view of a belt clamp state of the clamp mechanism.

FIG. 10 is a partial detailed view of a hot plate mounting portion.

FIG. 11 is a front sectional view of a grip shear device.

FIG. 12 is a side sectional view of a grip shear device.

FIG. 13 is a partial circuit diagram of the control device.

[Explanation of symbols]

1 binding head 5 frames 10
Welding device 20 Hot plate welding mechanism 21 Hot plate 22
Hot plate insertion cylinder 23 Strip separation guide 24 Strip guide cylinder 25
Pressure cylinder 26 Pressure element 27 Pressure arm 28
Duracon 29 Hot plate mount 30 Clamp mechanism 31
Clamp 35 Clamp cylinder 40 Base mechanism 41
Base 42 Clamp recess 45 Base cylinder 50
Grip shear device 51 gripper 52 pin 53
Side plate 54 Sliding body 55 Grip / Chassis Linda 56
Fixed cutter 57 Moving cutter 58 Link 59
Arm 60 Feed tightening device 65 Transmission 68
Motor 69 Feed tightening mechanism 70 Face gate 75
High rotor 80 Control device 85 Solenoid valve 86
Pressure reducing valve 90 band 251 piston 25
2 Spring 253 First air chamber 254 Second air chamber 25
5 Ventilation hole 256 Ventilation hole 291 Mounting bolt 29
2 spring 295 mica plate.

Claims (4)

[Claims] 1. A feeding and tightening device for feeding, pulling back and tightening a thermoplastic band, a grip device for gripping a front end of the band, a welding device for welding a band overlapping portion, and a shear device for cutting an excess band. And a controller for controlling the operation of each of these devices, in a thermoplastic band binding head, the hot plate welding mechanism of the welding device is provided with a spring built-in air cylinder, that is, a first air chamber and a second air chamber of the cylinder. It is opened and weakly pressurized by a spring provided for urging the piston, and then compressed air is introduced into the first air chamber to perform strong pressure.
Attaching pressure cylinders for different strengths, the thermoplastic bands in contact with the upper and lower surfaces of the hot plate are melted by weakly adhering them to the hot plate properly. A thermoplastic band binding head, characterized by being constructed so that the bands are welded together. 2. A feeding and tightening device for feeding, pulling back and tightening a thermoplastic band, a grip device for gripping a leading end of the band, a welding device for welding a band overlapping portion, and a shearing device for cutting an excess band. And a controller for controlling the operation of each of these devices, in a thermoplastic band binding head, the hot plate welding mechanism of the welding device appropriately separates the upper and lower two thermoplastic bands for hot plate insertion. A band guide cylinder for advancing the band separation guide is attached so that only the advancing operation is performed and the retreat is configured in a free state. Operation of both cylinders by moving the hot plate itself forward while retracting it together with the piston so that it can be returned after use, and the tip of the hot plate and the tip of the band separation guide can be contacted and engaged. A collaborative work When the hot plate is inserted between the upper and lower two bands after the band superposition, the hot plate advances by the forward movement of the hot plate insertion cylinder and comes into contact with and engages with the band separation guide while retracting the band separation guide. A thermoplastic band binding head, characterized in that the hot plate itself is configured to smoothly and easily insert between the upper and lower bands and to restore the band separation guide. 3. A feeding and tightening device for feeding, pulling back and tightening a thermoplastic band, a grip device for gripping a leading end of the band, a welding device for welding a band overlapping portion, and a shearing device for cutting an excess band. In the binding head of the thermoplastic band, which is provided with a control device that controls the operation of each of these devices, the control device is provided with each device that operates based on the sequencer and the solenoid valve, and an air cylinder for each mechanism, A thermoplastic band binding head characterized in that the operation timing of each device and mechanism can be changed and selected very easily. 4. A feeding and tightening device for feeding, pulling back and tightening a thermoplastic band, a grip device for gripping a leading end of the band, a welding device for welding a band overlapping part, and a shear device for cutting an excess band. And a thermoplastic band binding head including a control device for controlling the operation of each of these devices, a grip mechanism is formed by the lower surface of the fixed cutter of the shear mechanism and an openable / closable gripper, and the gripper opening / closing and shear mechanism Operate both moving cutters in a timely manner 2
A thermoplastic band binding head characterized in that a grip cylinder device is constructed by separately providing a step plate cylinder and a base plate and a grip mechanism so that they can be easily attached and detached and maintained.