JPH06278710A - Binding machine - Google Patents

Abstract

PURPOSE:To obtain a stable tightening force while contriving to shorten a tightening time by a secondary tightening roller and, particularly, to shorten the tightening time in the case of binding a small work. CONSTITUTION:In a binding machine 1 for winding a band around a work W by tightening through a secondary tightening roller 5 and for binding the work through a prescribed tightening force, when a sensor 18 for detecting the size of the work W is arranged in an arch guide 17 and the rotational speed of the secondary tightening roller 5 is adjusted according to the size of the work detected by the sensor 18, the time for a secondary tightening operation is made almost constant irrespective of the size of the work W so that it is possible to contrive to shorten a tightening time and to stabilize a tightening force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a binding machine for banding boxes and bundling stacked paper sheets, and more particularly to a high-speed binding machine.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Publication No. 3-9004
As disclosed in Japanese Patent Laid-Open Publication No. JP-A-2004-242242, when a box is packed or stacked papers are bound together, the box and the stacked papers (hereinafter referred to as works) are bound automatically by a band. It has been known. This type of binding machine includes a forward rotation roller for pulling out the band, a primary tightening roller for pulling back the band, and a secondary tightening for giving a large tightening force to the band pulled back by the primary tightening roller. Equipped with rollers,
Each of these rollers is arranged along a band shooter that allows the band to pass freely, and guides the band led out by the forward rotation roller around the work on a table on which the work is arranged. It is equipped with a frame-shaped arch guide.

As a binding operation in this binding machine, first, the band which has been wound around the reel in advance is led out to the arch guide by the forward rotation roller, and the band is placed along the arch guide. At the same time, the work is placed in the internal space of the arch guide. Then, with the front end of the band clamped under the work, the band is pulled back by the primary tightening roller, whereby the band is pulled out from the arch guide toward the outer surface of the work by a predetermined amount. After that, the tightening operation is switched to the secondary tightening roller, the band is pulled back while applying a large tightening force to the band by the secondary tightening roller, and the band is bound with a predetermined tightening force while contacting the periphery of the work. Then, in this state, a part of the band is overlapped with the tip of the clamped band to fuse the overlapped part, and the band is cut at a predetermined position so that the binding operation is completed. It has become. As a result, the works can be bound with a large binding force.

In addition, in the band feeding and pulling-back operations by these rollers, a pressing roller which can be brought into contact with and separated from each roller is arranged, and the roller in contact with the pressing roller is the pressing roller. It is supposed to be held by holding a band between them.

Further, conventionally, there are a timer adjustment type and a torque adjustment type as the drive system of the secondary tightening roller in this type of binding machine. In the former timer adjustment formula, the rotation speed of the secondary tightening roller is fixed and the tightening time by the secondary tightening roller is set according to the size of the work.
A predetermined tightening force is obtained after the set tightening time has elapsed. On the other hand, the latter torque adjustment formula recognizes that a predetermined tightening force is obtained when the band tightens around the workpiece and the secondary tightening roller begins to slip on the band during tightening by the secondary tightening roller. The secondary tightening roller is used to release the tightening.

[0006]

However, the drive system of the secondary tightening roller as described above has the following problems. First, in the timer adjustment method, the tightening time varies depending on the size of the work, and especially for a small work, the tightening time becomes long, which leads to a reduction in work efficiency. Therefore, it can be considered that the secondary tightening roller is always rotated at a high speed to shorten the tightening time. However, in this case, when the pulling operation by the primary tightening roller is changed to the tightening operation by the second tightening roller, the timer is operated during the scan time until the timer receives the signal from the control device and the timer starts to operate. The tightening operation is performed by the secondary tightening roller without being operated, and the band is pulled back. Therefore, the error of the timer occurs correspondingly, and it is impossible to obtain a stable tightening force. I will end up.

On the other hand, in the torque adjustment type, it is difficult to set the timing for releasing the tightening by the secondary tightening roller to the optimum timing, and there is a large variation in the timing for releasing the tightening due to various conditions such as environmental temperature and humidity. , Even with this method, it is not possible to obtain a stable tightening force.

The present invention has been made in view of these points, and is stable while shortening the tightening time by the secondary tightening roller, particularly shortening the tightening time when binding small works. The purpose is to obtain a binding machine that can obtain a tightening force.

[0009]

In order to achieve the above object, the present invention detects the size of an object to be bound in advance, and according to the size of the object to be bound, a secondary tightening roller The rotation speed was changed. Specifically, in the invention according to claim 1, a band passing means for allowing a band for binding the objects to be bound to pass therethrough, and a band-shaped member arranged around the object-to-be-bound object arrangement space to guide the band. Band guide means,
A forward rotation roller that is rotationally driven so as to draw out the band from the band passing unit toward the band guiding unit, and a band introduced into the band guiding unit by a predetermined amount from the band guiding unit toward the object to be bound. A primary tightening roller that is driven to rotate in a direction opposite to that of the forward rotation roller so as to be pulled out, and a band that is pulled out from the band guide means toward the object to be bound by a predetermined amount and is wrapped around the object to be bound. On the premise of a binding machine provided with a secondary tightening roller which is rotationally driven in the same direction as the primary tightening roller and with a rotational torque higher than the rotational torque of the primary tightening roller so as to bind with the tightening force of There is. Then, the bound object detecting means for detecting the size of the bound object and the output signal of the bound object detecting means are received, and the rotation speed of the secondary tightening roller is adjusted according to the size of the bound object. Secondary tightening roller speed adjusting means.

According to a second aspect of the present invention, in the binding machine according to the first aspect, the band guide means includes a pair of vertical plate portions opposed to each other and a horizontal plate portion extending between upper end portions of the vertical plate portions. And is arranged in the shape of a frame around the binding object arrangement space, and the binding object detection means is formed by a sensor provided on the vertical plate portion of the band guiding means, and the binding object is detected by the sensor. It is configured to detect the height dimension of.

According to a third aspect of the present invention, in the binding machine according to the first or second aspect, the band guide means is provided with a pair of vertical plate portions arranged opposite to each other and a horizontal plate extending between upper end portions of the vertical plate portions. And is arranged in a frame shape around the binding object arrangement space, and the binding object detection means is constituted by a sensor arranged on the lateral plate portion of the band guiding means, and the binding object detection means is constituted by the sensor. The width of the bundle is detected.

[0012]

With the above construction, the present invention provides the following actions. In the invention according to claim 1, as a binding operation of the objects to be bound, first, the band is led out from the band passing means toward the band guiding means by rotationally driving the forward rotation roller. After that, the band introduced into the band guiding means is pulled out from the band guiding means toward the object to be bound by a predetermined amount by rotationally driving the primary tightening roller. Furthermore, after that, by the rotational drive of the secondary tightening roller,
The band drawn out from the band guiding means toward the object to be bound by a predetermined amount is wound around the object to be bound and bound with a predetermined tightening force. During such a binding operation, the bound object detecting means detects the size of the bound object in advance, and an output signal of the bound object detecting means is transmitted to the secondary tightening roller speed adjusting means, The secondary tightening roller speed adjusting means adjusts the rotation speed of the secondary tightening roller according to the size of the object to be bound. As a result, the time for the secondary tightening operation can be made substantially constant regardless of the size of the object to be bound.

According to the second aspect of the present invention, the height dimension of the object to be bound is detected by the sensor provided on the vertical plate portion of the band guiding means, and the size of the object to be bound is recognized based on this. By adjusting the rotation speed of the secondary tightening roller, the time of the secondary tightening operation can be made substantially constant.

According to the third aspect of the present invention, the width dimension of the object to be bound is detected by the sensor provided on the lateral plate portion of the band guiding means, and the size of the object to be bound is recognized based on the detected width dimension.
By adjusting the rotation speed of the secondary tightening roller, the time of the secondary tightening operation can be made substantially constant.

[0015]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the internal structure of the binding machine 1. In FIG. 1, 2 is a band shooter as a band passing means in the present invention for guiding the sending and pulling back of the band. Below the band shooter 2, a part of the outer peripheral surface is a band shooter 2. The band shooter 2
The forward rotation roller 3, the primary tightening roller 4, and the secondary tightening roller 5 are provided at a predetermined interval in the extension direction of the. The drive shaft of the motor 6 with a reduction gear (see FIG. 2) is directly connected to the rotary shaft 3a of the normal rotation roller 3, and the gear (not shown) provided on the rotary shaft 3a is the rotary shaft of the primary tightening roller 4. It is meshed with a gear (not shown) provided on 4a. Further, the gear of the primary tightening roller 4 is formed to have a larger diameter than the gear of the forward rotation roller 3. With such a configuration, the driving force of the motor with reduction gear 6 transmitted to the forward rotation roller 3 is also transmitted to the primary tightening roller 4 via each gear, whereby the forward rotation roller 3, The primary tightening rollers 4 always rotate in opposite directions (the forward rotation roller 3 rotates counterclockwise in FIG. 1 and the primary tightening rollers 4 rotate clockwise in FIG. 1), and rotation per unit time. The number is larger in the forward rotation roller 3.

1 and 2, reference numeral 7 is a forward rotation pressing roller, 8 is a primary tightening pressing roller, and these pressing rollers 7 and 8 are above the normal rotation roller 3 and the primary tightening roller 4, respectively. Is disposed at a position facing the rollers 3 and 4 with the band shooter 2 interposed therebetween. The pressing rollers 7 and 8 are pivotally supported by a supporting plate 9, and a swing adjusting mechanism 10 is connected to one end (the left end in FIG. 1) of the supporting plate 9. The swing adjusting mechanism 10 has a cam plate (not shown) connected to the drive shaft 11a of the motor 11 and an elevating rod 12 partly in contact with the outer peripheral edge of the cam plate. The cam plate rotates in accordance with the rotation of the drive shaft 11a, and the lifting rod 1
By setting the ascending / descending position of 2, the swinging position of the support plate 9 is set, whereby the forward rotation pressing roller 7 is in contact with the forward rotation roller 3, and the primary tightening pressing roller 8 is the primary It can be switched to a state of being brought into contact with the tightening roller 4. In other words, the band feeding operation by the forward rotation roller 3 and the band pulling operation by the primary tightening roller 4 can be switched depending on the ascending / descending position of the ascending / descending rod 12 accompanying the driving of the motor 11.

On the other hand, a part of the outer peripheral surface of the secondary tightening roller 5 faces the rear end portion (right side in FIG. 1) in the band shooter 2, and the normal rotation roller 3 and the primary tightening roller 4 are provided.
The rotation shaft 5a of the secondary tightening roller 5 is configured to rotate at a lower speed and higher torque (clockwise direction in FIG. 1) than the tightening motor 13 (which is a geared motor with a brake attached to the back surface of the substrate 1a). 2) (see FIG. 2). The secondary tightening roller 5 is a large diameter roller in which an elastic body such as urethane having a large frictional resistance is attached to the outer circumference of a metal roller.

Further, 14 is a secondary tightening and pressing roller, which is supported by the eccentric shaft 14a and has a timer connected to the solenoid 1
The other end of the crank 15b, one end of which is connected to the rod 15a of No. 5, is connected to the tip of the eccentric shaft 14a, and the solenoid 15
By the expansion and contraction of the rod 15a by the excitation of the secondary tightening roller 14, the secondary tightening pressing roller 14 can be pressed against and separated from the outer peripheral surface of the secondary tightening roller 5.

Reference numeral 16 denotes a guide shooter, which covers a part of the outer periphery of the secondary tightening roller 5 via the band passage interval, one end of which is the rear end of the band shooter 2 and the other end of which is the secondary tightening pressing roller. It is attached so as to face a part of the outer circumference of 14.

A table T for arranging the works W as the objects to be bound is arranged above the band shooter 2, and the forward rotation roller 3 is arranged on the table T.
An arch guide 17 is provided as a band guiding means in the present invention for guiding and holding the band guided by the outer peripheral side of the work W (see FIG. 3). As shown in FIG. 3, the arch guide 17 has a frame-like shape composed of a pair of vertical plate portions 17a, 17a facing each other and a horizontal plate portion 17b provided between upper end portions of the vertical plate portions 17a, 17a. As a member, a groove into which a band can be introduced is formed inside.

The vertical plate portion 1 of the arch guide 17 into which a band is introduced is one of the characteristic structures of this embodiment.
7a and 17a are provided with a plurality of work height detecting sensors 18 (bounded object detecting means in the present invention) arranged at predetermined intervals in the vertical direction (in the present example, 3 in the vertical direction).
It is provided). Specifically, this sensor 18
An infrared sensor, which has a light emitting portion 18a on one side and a light receiving portion 18b on the other side of the pair of vertical plate portions 17a, 17a of the arch guide 17, and blocks light in a state where the work W is arranged in the arch guide 17. The height of the work W is detected by recognizing the formed portion. Then, the detection signal of the sensor 18 is the binding device 1
It is sent to the control unit 19 that controls the whole,
The control unit 19 sends a control signal according to the height dimension of the work W to the motor controller 20 of the tightening motor 13, so that the tightening motor 13 is rotated at a predetermined rotation speed. That is, the control unit 19 constitutes the secondary tightening roller speed adjusting means in the present invention. As the setting of the rotation speed, the smaller the height dimension of the work W, the higher the rotation speed of the tightening motor 13 by the motor controller 20 is controlled. That is, in this example, the height dimension of the workpiece W to be detected has four stages because the sensors 18 are provided at three positions above and below, and the rotation speed of the tightening motor 13 is also switched to four stages according to each stage. It is like this.

Next, the binding machine 1 configured as described above.
The bundling operation operation in FIG. First, the normal rotation pressing roller 7 is brought into contact with the normal rotation roller 3 by the swing adjusting mechanism 10, whereby a band is sandwiched between the both 3 and 7, and the band is unwound from a reel (not shown) to be a band shooter. It is introduced along the arch guide 17 via 2. When the tip of the band introduced along the arch guide 17 reaches below the table T, the tip of the band is clamped by a clamp mechanism (not shown). At approximately the same time as this operation, the work W is moved to the arch guide 1 by the conveyor or the operator.
7 is placed in the work placement space. At this time, the height dimension of the work W is detected by the sensor 18, and the detection signal is transmitted to the control unit 19. After this, the binding operation is started. This binding operation is performed by a primary tightening operation and a secondary tightening operation. First, in the primary tightening operation,
The swing adjustment mechanism 10 releases the contact state between the normal rotation pressing roller 7 and the normal rotation roller 3 that have been in contact with each other at the same time, and at the same time, the primary tightening pressing roller 8 turns into the primary tightening roller 4
The band is clamped between the both 4 and 8 so that the band is pulled back, and the band is released from the arch guide 17 and pulled out toward the outer side surface of the work W by a predetermined amount. . In this way, after the band is pulled out, the secondary tightening operation is switched. In this secondary tightening operation, the motor controller 20 adjusts the rotation speed of the secondary tightening roller 5 according to the height dimension of the workpiece W detected by the sensor 18. Specifically, when the height dimension of the work W is large by detecting the height dimension of the work W by the sensor 18, the rotation speed of the secondary tightening roller 5 is set to a relatively low speed, and The smaller the height dimension,
The rotation speed of the secondary tightening roller 5 is set to a high speed. Then, in the secondary tightening operation, the contact state between the primary tightening press roller 8 and the primary tightening roller 4, which are in contact with each other by the swing adjusting mechanism 10 in the above-described primary tightening operation, is actually used. Is released, and at the same time, solenoid 1
5 is excited, the rod 15a is extended downward, the secondary tightening pressing roller 14 rotates by a predetermined amount as the crank 15b rotates, and the outer peripheral surface thereof abuts on the secondary tightening roller 5. As a result, the band is clamped between the two members 5 and 14 and is pulled back by a high tightening force, and the band is bound with a predetermined tightening force while contacting the outer peripheral portion of the work W. And in this state, part of the band,
The binding operation is completed by superposing the superposed portion on the clamped band to fuse the superposed portion and cutting the band at a predetermined position. As a result, the works W can be bound with a large binding force.

As described above, according to the configuration of this example, the height dimension of the work W is detected before the secondary tightening operation is started, and the secondary fastening roller 5 of the secondary tightening roller 5 is detected according to the height dimension of the work W. The rotation speed can be changed, and the smaller the height of the workpiece W, the more 2
Since the rotation speed of the secondary tightening roller 5 is increased, the time of the secondary tightening operation can be made substantially constant for a work W of any size, and the secondary tightening operation can be performed for a small work W. The tightening time by the roller 5 can be shortened, and the tightening force can be stably obtained along with the stabilization of the tightening time.

In this embodiment, the size of the work W is recognized based on the height of the work W. However, the present invention is not limited to this, and the width and depth of the work W are detected. 2 based on this sensed size
The configuration may be such that the rotation speed of the next tightening roller 5 is changed. That is, as the embodiment according to the invention described in claim 3, if the light emitting portion and the light receiving portion of the sensor are arranged on the lateral plate portion 17b of the arch guide 17 and the table T, the width dimension of the work W is detected. Therefore, the size of the work W can be recognized. Further, by combining this configuration with the configuration in which the sensor 18 is provided on the vertical plate portion 17a of the arch guide 17 as in the above-described embodiment, the size of the work W can be recognized more accurately.

[0025]

As described above, according to the present invention,
The effects are exhibited as described below. According to the first aspect of the present invention, the bound object detecting means for detecting the size of the bound object and the output signal of the bound object detecting means are received, and the secondary tightening is performed according to the size of the bound object. Since the secondary tightening roller speed adjusting means for adjusting the rotation speed of the roller is provided, the secondary tightening operation time can be made substantially constant regardless of the size of the material to be bound. With respect to the small work W, the tightening time by the secondary tightening roller can be shortened, and the tightening force can be stably obtained along with the stabilization of the tightening time.

According to the second aspect of the present invention, the object to be bound detecting means is constituted by a sensor arranged on the vertical plate portion of the band guiding means, and the sensor detects the height of the object to be bound. With such a configuration, the size of the bound object can be recognized based on this height dimension, and the size of the bound object can be recognized with a simple configuration.

According to the third aspect of the present invention, the object to be bound detecting means is constituted by a sensor arranged on the lateral plate portion of the band guiding means, and the sensor detects the width dimension of the object to be bound. With this configuration, the size of the bound object can be recognized based on this width dimension, and in this case also, the size of the bound object can be recognized with a simple configuration.

[Brief description of drawings]

FIG. 1 is a side view showing an internal structure of a binding machine.

FIG. 2 is a plan view of the binding machine.

FIG. 3 is a diagram showing a rotation speed control system of a secondary tightening roller.

[Explanation of symbols]

 1 Bundling machine 2 Band shooter (band passing means) 3 Forward rotation roller 4 Primary tightening roller 5 Secondary tightening roller 17 Arch guide (band guiding means) 17a Vertical plate part 17b Horizontal plate part 18 Sensor (bound object detecting means) 19 Control unit (Secondary tightening roller speed adjusting means) W Work (Binding object)

Claims (3)

[Claims] 1. A band passing means for allowing a band for binding an object to be bound to pass therethrough, a band guiding means arranged in a frame shape around the object to be bound and guiding the band, and the band. A forward rotation roller that is rotationally driven so as to draw out the band from the passing means toward the band guiding means, and draws out the band introduced into the band guiding means from the band guiding means toward the object to be bound by a predetermined amount. First, a primary tightening roller that is driven to rotate in a direction opposite to that of the normal rotation roller, and a band that is pulled out from the band guiding means toward the object to be bound by a predetermined amount are wound around the object to be bound and predetermined tightening is performed. A binding machine provided with a secondary fastening roller that is driven to rotate in the same direction as the primary fastening roller and with a rotational torque higher than the rotational torque of the primary fastening roller so as to bind with force. 2 to adjust the material to be bound detection means for detecting the size of the material to be bound, it receives the output signal of 該被 binding object detection unit, the rotational speed of the secondary fastening roller in accordance with the size of the material to be bound
A binding machine comprising a second tightening roller speed adjusting means. 2. The band guide means includes a pair of vertical plate portions that are arranged to face each other and a horizontal plate portion that extends between upper end portions of the vertical plate portions, and is arranged in a frame shape around the bundled object arrangement space. The binding object detection means is composed of a sensor arranged on the vertical plate portion of the band guiding means, and the sensor is configured to detect the height dimension of the binding object. The binding machine according to claim 1. 3. The band guide means includes a pair of vertical plate portions arranged opposite to each other and a horizontal plate portion extending between upper end portions of the vertical plate portions, and is arranged in a frame shape around a binding object arrangement space. The bound object detection means is composed of a sensor arranged on the lateral plate portion of the band guiding means, and the sensor is configured to detect the width dimension of the bound object. The binding machine according to claim 1 or 2.