JPH06271041A - Belt adjusting device - Google Patents

Abstract

PURPOSE:To provide a belt adjusting device in which a tension difference between a right and a left end of width of an endless belt stretched between plural rollers can automatically be corrected. CONSTITUTION:A means 4b as subject to detection comprising a detection member or detection mark is provided to be positioned at each width end of an endless belt 3 stretched between plural sets of rollers 1, 2, and a detector 5a, 5b to detect a position of the means 4b is provided corresponding to the position, so a position deflection condition in an advance direction between both width ends of the belt 3 is detected by the detectors 5a, 5b, and an angle of a rotation shaft of the roller 2 around which the belt 3 is wound is changed by a cylinder 8b through a control device 9 based on a detection signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention automatically corrects the lateral movement or meandering of a belt by correcting the front-back deviation in the traveling direction of both width ends of an endless belt wound between a plurality of sets of rolls. The present invention relates to a belt adjusting device that is configured to be corrected.

[0002]

2. Description of the Related Art Conventionally, in producing an endless belt 3 which is wound around a plurality of sets of rolls in sequence and travels, it is extremely difficult to form the circumferential lengths of both width ends to the same size with high accuracy. It was difficult. Moreover, due to various factors such as variations in the amount of expansion on the left and right width ends due to long-term use, or the parallel running accuracy of the rolls that are wound around each other when incorporated into the device, the relative travel distance of the width ends is increased. Gaps occur,
The roll tends to move to one side in the axial direction or meander. Further, there is a problem that the dimension w in the lateral width direction of the belt shrinks due to the relative difference in travel distance between the both width ends of the belt (deviation between the front and rear). This tendency becomes more remarkable as the slip amount of the belt with respect to the wound roll is smaller, in other words, as the belt tension is higher. As a means for correcting such a tendency in the running state, conventionally, after visually grasping the situation, a method of manually adjusting the tension at both width ends of the belt to change and adjust the angle of the rotation axis of a part of the rolls. Was taken.

[0003]

However, such a conventional method not only requires frequent labor, but also
The correction of the deviation caused by various factors requires a highly advanced skill. Therefore, there has been a demand for an improvement measure that can easily correct the deviation at the left and right width ends of the belt without requiring human labor. As described above, it is extremely difficult to form the endless belt wound around a plurality of sets of rolls with high accuracy in the lateral width direction and the right and left circumferential lengths in the same dimension. Also, the amount of stretch on the left and right may vary depending on the use of the belt, or due to various factors such as the parallel accuracy of the roll when assembled, the relative traveling movement amount in the traveling direction of both width ends may shift, causing the belt to move in the axial direction of the roll. There is a problem that the belt tends to move or meander, and the belt width contracts due to such a situation. In order to cope with the above tendency, the present invention confirms the belt condition by visual observation, which has been performed so far, and then manually adjusts the angle of the rotation axis of the roll to change the relative tension on both width end sides of the belt. Instead, the invention provides a belt adjustment device configured to automatically perform the correction.

[0004]

Therefore, according to the present invention, there is provided a detected means consisting of a detection piece or a detection mark located at both width ends of an endless belt wound between a plurality of sets of rolls. A detector for detecting the position of the detected means corresponding to the position is provided, and the detector detects the positional deviation state in the traveling direction between the both width ends of the belt, and the detection signal causes the belt to move through the control device. It is configured so as to change the angle of the rotating shaft of the wound roll, and this serves as a means for solving the problem.

[0005]

According to the present invention, a relative deviation in the traveling direction of both width ends of the endless belt can be detected by the above construction, and when the deviation is on the front side, the angle in the roll axis direction is changed to change the direction. The belt tension is increased, and conversely, when the deviation occurs on the rear side, the belt tension on the belt end side is decreased. The adjustment is performed by automatically operating the angle changing device of the rotation axis of the roll by feedback of the belt position deviation detection signal, and the belt always runs while maintaining the parallel state,
As a result, the amount of shrinkage in the width direction can be reduced.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments of the drawings. FIG. 1 shows an embodiment of the present invention. The belt adjusting device shown in FIG. 1 is clearly shown in FIG. 2 as a detection means located at both width ends of the endless belt 3 which is wound around a plurality of rolls 1 and 2 and travels. Such a single protruding piece 4a, 4b is provided, and as shown in the enlarged view of FIG. 3, a detector composed of a pair of transmissive photoelectric tubes is provided above and below the belt 3 corresponding to the protruding piece 4a, 4b. 5a, 5b and 6a, 6b are provided. Further, in FIG. 1, 5a and 5b
Photoelectric tubes 5 and 6 composed of 6a and 6a are placed in a direction perpendicular to the belt running direction (the photoelectric tubes 5 and 6 correspond to the mounting positions of the projecting pieces 4 and are located at both width ends of the belt). The relative mounting position may be moved back and forth as long as it is possible to detect a relative front-back deviation.) Next, one of the rolls 1 and 2 has a guide 7 at both ends of the rotary shaft.
a and 7b are slidably supported and are axially supported by the head portions of the pair of cylinders 8a and 8b.
By the expansion and contraction of a and 8b, the angle of the rotation axis of the roll 2, that is, the tension at both width ends of the wound endless belt 3 can be arbitrarily changed. Reference numeral 9 in FIG. 1 denotes a control device which receives a detection signal from the transmission type phototubes 5 and 6 and operates the angle changing device of the rotation axis of the roll 2.

Next, the operation of the embodiment constructed as described above will be described. FIG. 4 shows an example in which the left side of the endless belt 3 is relatively delayed in the traveling direction (left side of the drawing). When a tendency occurs, the pressure on the cylinder 8b side that supports the left end of the rotation shaft of the roll 2 is reduced, or conversely, the pressure on the cylinder 8a side is increased, whereby the direction (angle) of the rotation shaft of the roll 2 is increased. Is rotated to the state shown by the alternate long and short dash line in the figure, and the tension on the left side of the belt 3 is adjusted to be relatively small. Next, FIG. 5 shows an example of the case where the left side of the endless belt 3 relatively advances in the traveling direction, but when the tendency is the same, contrary to the case shown in FIG. To the state of the one-dot chain line in the figure,
The tension on the left side of the belt 3 is adjusted and set relatively larger than the tension on the right side. In such an adjusting operation, the detection signals from the detectors 5 and 6 which detect the front and rear deviations in the traveling direction of the left and right ends of the belt are fed back via the control device 9 to the cylinders 8a and 8b which are roll angle changing devices. And operate it. That is, the cylinder 8a,
It can be automatically performed by changing and adjusting the pressure applied to 8b.

Next, FIG. 6 and FIG. 7 are explanatory views of another embodiment according to the present invention, and the structure and operation thereof will be briefly described below. FIG. 6 shows an example of a method for detecting a front-back deviation in the traveling direction of the left and right width ends of the traveling belt. Figure 6
In the example of (a), the line 10 is printed on both width ends of the belt, or the reflection sheet 10 is attached, and the detection mark 10 is read through the reflection type photoelectric tube 11. Is. In the example of FIG. 6B, the metal wire or the plate 12 is fixed to both width ends of the belt, and the position is detected by the proximity switch 13 or the like. As another example, as shown in FIG. 6 (c), there is one in which a detection object 4 protruding from the belt 3 operates a detector such as a micro switch 18 for detection. The relative front and rear position displacement amounts (distances) S at both width ends of the belt are reflection type photocells 11a and 11b (subscripts a and b indicate left and right. The same applies hereinafter) and proximity switch 13a. , 13b, etc., the difference between the detection times is t, and the traveling speed of the belt is v, and the calculation can be performed by S = v · t. Further, the shift direction can be determined by the operation sequence of the left and right detectors.

Next, FIG. 7 shows an example of a device for changing the angle of the rotating shaft of the roll 2 for winding and running the belt 3. In this embodiment, the roll 2 is replaced with the cylinders 8a and 8b in the above embodiment.
Each end of the rotary shaft of is rotatably supported on the tip ends of the left and right screws 14a and 14b, fixed to the respective shaft ends of the left and right motors 15a and 15b, and screwed to the respective screws 14a and 14b. By rotating each of the screws 16a and 16b, the screws 14a and 14b are expanded and contracted, and the rotation axis angle θ of the roll is increased.
Is configured so that it can be changed arbitrarily. In this embodiment, the moving distance L of the shaft end is controlled as compared with the cylinder type in which the pressure (air pressure, hydraulic pressure) applied to the cylinders 8a and 8b is changed, and the moving distance L is the number of rotations of the motor 15. Is N and the pitch of the screw 14 is p,
It is calculated by L = p · N. The rotation speed of the motor 15 or the screw 16 can be easily measured by providing a rotation detecting means such as the encoder 17. The present invention is configured and functions as described above, and there are various types of means for detecting left and right front and rear deviations of the endless belt 3 and a device for changing the angle of the rotation axis of the roll, other than those exemplified above. The present invention is not limited to these examples, and various modifications can be made without departing from the gist of the present invention.

[0010]

As described above in detail, according to the present invention, the traveling movement amount of both width ends of the endless belt depends on various factors such as the manufacturing accuracy of the endless belt or the assembly accuracy of the roll for winding the belt. Differently, the deviation amount and direction are detected for each cycle with respect to the twisting of the belt (deviation in the widthwise ends of the belt in the front-rear direction) caused by this, and the result is fed back to the roll rotation shaft angle adjusting device or the belt tension adjusting device. To control
The endless belt can be constantly moved and corrected toward the center of the wound guide roll, and related reduction of the lateral width direction of the belt can be prevented. As a result, the belt can be operated accurately, and an operator or the like who has conventionally been in charge of the correction is not required, so that labor can be saved.

[Brief description of drawings]

FIG. 1 is a schematic configuration explanatory diagram of a belt adjusting device according to the present invention.

FIG. 2 is a front view of a belt adjusting device according to the present invention.

FIG. 3 is a view on arrow AA.

FIG. 4 is an explanatory diagram of a control example of the belt adjustment device in FIG.

5 is an explanatory diagram of a control example of the belt adjustment device in FIG.

FIG. 6 is a side view showing various detection methods of relative front-back misalignment in the traveling direction of the left and right width ends of the belt.

FIG. 7 is an explanatory view showing another embodiment of the angle changing device for the rotation axis of the roll around which the belt is wound.

[Explanation of symbols]

 1 Roll 2 Roll 3 Endless Belt 4 Projection Piece (Detected Object) 5 Transmission Photoelectric Tube 6 Transmission Photoelectric Tube 7 Guide 8 Cylinder 9 Control Device 10 Detection Mark (Printing Line, Reflection Sheet, etc.) 11 Reflection Photoelectric Tube 12 Metal Wire (Metal) Plate) 13 Proximity switch 14 Screw 15 Motor 16 Screw 17 Encoder 18 Micro switch w Belt width

Claims (1)

[Claims] 1. A detection means composed of a detection piece or a detection mark is provided at both width ends of an endless belt wound between a plurality of sets of rolls, and the detection means has a position corresponding to the same position. The detector detects the position deviation in the traveling direction between the width ends of the belt by the detector, and the angle of the rotation axis of the roll around which the belt is wound by the control device by the detection signal. A belt adjusting device characterized in that it is configured to change.