JPH0565124A - Detecting device for primary tightening of band - Google Patents

Abstract

PURPOSE:To detect accurately the completion of a primary tightening for which one end of a band, which is guided into a band guide of an automatic packing machine, is held, and the band is tightened and wound around an article-to-be- packed. CONSTITUTION:An actuator 21 is attached in such a manner that a pressing unit 25 protrudes to a band guide 1 side at the forth corner. A slip preventive member 13, which prevents a band 7 from slipping when the band 7 presses the pressing unit 25, is attached at the forth corner of the band guide 1. The approach of a detecting member 31, which is attached to the actuator 21, is detected by a lead switch 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band primary tightening detection device for detecting the completion of primary tightening for winding a band guided in a band guide around a package.

[0002]

2. Description of the Related Art In an automatic packing machine that guides a band in a band guide and hangs this band on a package, the guided band is tightened and wrapped around the package to perform primary tightening, and after completion of the primary tightening. Secondary tightening is performed in which the tightening amount (tightening force) of the band wrapped around the package is set and tightening is performed.

The primary tightening is performed by pulling the band and pulling it out from the band guide. First, the band guide is moved while leaving the band as it is. Then, the applied tensile force causes the band to sequentially deform and move the band guide from the first corner portion, and the band guide is pulled out from the band guide to complete the primary tightening.

Completion of the primary tightening is detected by a detecting member fixed to the fourth corner portion of the band guide and a proximity sensor for detecting the approach of the detecting member, and then the secondary tightening is immediately performed. ..

[0005]

By the way, although the problem is less likely to occur when the width of the band is wide, when the width of the band is as narrow as 5 mm to 6 mm, the primary tightening is performed in the detection device having such a configuration. It is difficult to detect all completions of. Because the band guide is pressed against the arch so as to guide the band stably, the band tilts or bends when pulled out from the band guide. Therefore, the moving distance of the band guide becomes smaller than the width of the band. Therefore, the proximity of the band guide that moves only a distance smaller than the width of the narrow band, and thus the detection member fixed to the band guide, cannot be accurately detected by the proximity sensor. Furthermore, if the width of the band is narrow, the tensile force applied to the band is set to be weak due to the strength problem, so that the inclination or bending of the band becomes large, and the moving distance of the band guide and thus the detecting member becomes smaller.

Therefore, it is an object of the present invention to provide a band primary tightening detection device capable of reliably detecting the completion of the primary tightening even when the band width is narrow.

[0007]

In order to achieve this object, the present invention aims to suppress one end of a band guided in a band guide of an automatic packing machine, tighten the band, and perform a primary tightening for winding the band around a package. Regarding a band primary tightening detection device for detecting completion, an actuator that is provided so as to be positioned at a fourth corner portion of the band guide and that is actuated by being pushed by the band that has passed through the band guide, and an actuator.
A sensor for detecting the operation of the actuator and a shift preventing member for preventing the band from shifting in the direction away from the actuator are employed as means.

[0008]

The band is prevented from being displaced by the displacement preventing member and the actuator is pushed and operated. Since the actuating resistance of the actuator can be set small, the band does not tilt or bend when the actuator is pushed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing a primary band tightening detection device according to the present invention.

The band guide 1 is a spring (not shown).
It is pressed against the arch 3 by. A band passage 5 that opens in the direction of the arch 3 is formed in the band guide 1, and the band 7 is guided in the band passage 5 (see FIG. 2) so as to surround a package (not shown). ..

A side guide 9 is provided to the fourth corner portion of the band guide 1 so as to close the band passage 5 of the band guide 1. Further, the horizontal portion 15 of the deviation preventing member 13 is fixed to the mounting member 11 fixed to the fourth corner portion of the band guide 1, and the vertical portion 17 of the deviation preventing member 13 normally contacts the side guide 9. ing.

A mounting plate 19 is fixed to the back side of the side guide 9, and a lower part of an actuator 21 is rotatably mounted to the lower end of the mounting plate 19. Lower end of actuator 21 and mounting plate 1
A tension coil spring 23 is hung between 9 and
The pressing portion 25 formed at the upper end of the actuator 21 projects toward the band guide 1 from the projecting holes 27 and 29 provided in the vertical portion 17 of the side guide 9 and the deviation preventing member 13 (see also FIG. 2). ..

A metal detection member 31 is attached to the upper end of the actuator 21, and a lead switch 33 for detecting the approach of the detection member 31 is attached to the attachment plate 19.
(Sensor) is attached.

Reference numeral 35 in the drawing denotes a hinge device for supporting the band guide 1.

FIG. 2 is a side view of the primary band tightening detection device.

Deformation of the fourth corner of the band guide 1
The band 7 that has been moved and pulled out of the band guide 1 pushes the pressing portion 25 of the actuator 21, and resists the weak spring force of the tension coil spring 23 to cause the actuator 21 to move.
Operate. At this time, the vertical portion 17 of the deviation prevention member 13 is pushed by the band 7 and moves to the position indicated by the phantom line, but the band 7 is moved in the direction away from the actuator 21 by the action of the restoring force of the band guide 1. Prevent it from slipping.

FIG. 3 is a plan view of the band primary tightening detection device.

The pushing portion 25 of the actuator 21 pushed by the band 7 moves sufficiently in the direction away from the band guide 1, and the lead switch 33 surely detects the approach of the detecting member 31.

[0020]

As described above, in the primary tightening detection device according to the present invention, when the band comes into contact with and pushes the components of the device, the band does not tilt, bend, or shift. The completion of the primary tightening will be accurately detected.

[Brief description of drawings]

FIG. 1 is a front view showing a band primary fastening detection device according to the present invention.

FIG. 2 is a side view of the band primary tightening detection device.

FIG. 3 is a plan view of a band primary tightening detection device.

[Explanation of sign]

 1 band guide 7 band 13 slip prevention member 21 actuator 33 read switch (sensor)

Claims (1)

[Claims] 1. A band primary tightening detection device for detecting the completion of first tightening of a band guided by a band guide of an automatic packing machine, tightening the band, and winding the band around a package. An actuator that is provided so as to be located at the fourth corner portion of the band guide and that is operated by being pushed by the band that has passed through the band guide; and a sensor that detects the operation of this actuator. A band primary tightening detection device, comprising: a shift prevention member that prevents the band from shifting in a direction away from the actuator.