JP2793025B2 - Axial position adjustment device for running web - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an apparatus for laterally adjusting the axis of a running web.

(Prior Art) In order to correct meandering or deviation of a pass line, etc., which occur during transport of a web, generally, Japanese Patent Publication No. 37-10058 and Japanese Patent Publication No. Sho 4
As shown in JP-A-5-37216, two parallel rollers are arranged in a web transport path, and these rollers are deflected in either direction to guide the axis of the web to a guide roller. Means for adjusting the lateral movement between the upper side and the lower side.

By the way, in such a web axis position adjusting mechanism, as shown in FIG. 4, a deflection angle θ is given to two rollers g and t having a radius r and arranged in parallel with a center distance a. In this case, the traverse amount ε of the web w can be given a lateral movement by an amount corresponding to ε = (πr + a) tan θ by the upper guide roller g and the lower tracking roller t.

However, the lateral movement is such that the web w moves on the tracking roller t from when the web w leaves the point A on the peripheral surface of the guide roller g to when it leaves the point B on the peripheral surface of the tracking roller t. Resulting from spirally traversing from one side to the other, the distance l
Is Therefore, the operation performed to adjust the axial position of the web w results in the web w spirally running on the tracking roller t, and as a result, a difference in tension occurs on both sides of the web w. For example, the web w during transportation may be wrinkled.

(Problems to be Solved by the Invention) The present invention has been made in view of such a problem, and an object of the present invention is to accurately and stably adjust the axial position of the web without causing wrinkles or the like. It is to provide a new device capable of performing such operations.

(Means for Solving the Problems) That is, according to the present invention, as a device for adjusting the position of an axis of a running web to achieve the above object, a pair of rollers arranged at intervals in a web transport path and A parallelogram link unit is constituted by a pair of left and right joining pieces that support the shaft end of the roller, and the link unit is supported so as to be rotatable within the transport plane of the web, and is linked to the link unit. Means for rotating the connecting piece so that the roller on the lower side in the web transport direction is displaced in the axial direction by an amount corresponding to the traverse amount of the web.

(Operation) With such a configuration, a means for rotating the connecting piece together with the rotation of the link unit is applied to the parallelogram link unit constituted by the two rollers and the left and right connecting pieces supporting these rollers. In this way, the roller on the lower side in the web transport direction is displaced in the axial direction by an amount corresponding to the traverse amount of the web, and the web is moved laterally without causing relative axial movement between the roller and the roller. Can be moved stably.

(Embodiment) An embodiment illustrating the present invention will be described below.

FIGS. 1 and 2 schematically show an embodiment of the present invention, in which a guide roller 1 on the upper side in the paper feeding direction and a tracking roller 2 on the lower side in the sheet feeding direction are respectively turned on the connecting pieces 3, 3. The rollers 1, 2 are supported by movably mounted bearings 4, 4, 5, 5.
Together form one parallelogram link unit. Reference numeral 6 denotes a support punch for supporting the above-described link unit so as to provide the rollers 1 and 2 with a required deflection angle θ.
Support shafts 7, 7 are erected at both ends thereof, and the support shafts 7, 7 rotatably support the base ends of the coupling pieces 3, 3 on the guide roller 1 side. Is attached to a rotating mechanism (not shown) via a shaft 8 fixed to the shaft.

Reference numeral 10 in the figure denotes a bell-crank type tracking roller moving lever rotatably mounted on a frame (not shown) via a shaft 11. The tip of the shorter arm 12 of the lever 10 is A pin 13 is connected to a long hole 9 provided in the vicinity of the center of the arm through a pin 13, and a continuous punch 16 is swingably mounted at the tip of the longer arm 14 via a pin 15. The support punch 6 is connected to the rollers 1 and 2 by a deflection angle θ
When one of the connecting pieces 3 is turned by the turning angle θ + α in the turning direction of the support punch 6 as shown by the two-dot chain line in FIG. Connecting punches 3, 3
Is configured to apply an axial displacement of an amount corresponding to the traverse amount 1 of the web w to the tracking roller 2 pivotally supported at the tip of the web.

In the device configured as described above, in order to suppress the meandering of the web w now being conveyed, or to align the ears of the web w, the rotating punch (not shown) is operated to move the support punch 6 counterclockwise in the figure. When the lever is rotated by an angle θ in the direction, the tracking roller moving lever 10 engaged with the elongated hole 9 of the support punch 6 via the pin 13 follows this and rotates counterclockwise in the drawing, The connecting punch 3 connected via the connecting punch 16 is similarly rotated counterclockwise in the drawing with the support shaft 7 at the end of the supporting punch 6 as a fulcrum. The tracking roller 2 constituting a parallelogram link unit together with the guide roller 3 rotates the deflection angle θ counterclockwise in the figure while maintaining the parallel relationship with the guide roller 1. Therefore, the web w wound around these rollers 1 and 2 makes a lateral movement of ε = (πr + a) tan θ (see FIG. 1) as described at the beginning, and In this case, the web w moves on the tracking roller 2 to the left in the figure. Traverse.

However, as described above, the tracking roller moving lever 10 engages the short arm 12 side with the support punch 6 and engages the longer arm 14 side near the pivot point side of the connecting piece 3 via the continuous punch 16. Together with the rotation of the support punch 6 by the angle θ,
A larger rotation angle, that is, a rotation angle of θ + α is given to the coupling piece 3.

Therefore, The distance c from the center of the supporting punch 6 to the connecting point of the lever 10 and the pivot point of the connecting piece 3 If the distance d to the joining point is appropriately set, the tracking roller 2 can be axially displaced leftward in the figure by a value close to the traverse amount 1 of the web generated as the rollers 1 and 2 rotate. The relative axial movement between the web w and the tracking roller 2 is suppressed, and the web w is stably moved in the lateral direction.

On the other hand, as the rollers 1 and 2 rotate, the transport path of the web w becomes longer than the initial length L. (Note that the fluctuation of the winding length of the web w around the rollers 1 and 2 used before and after the rotation is neglected.) However, the web w is correspondingly tensioned. , The coupling piece 8 exhibits a larger rotation angle θ + α with respect to the deflection angle θ.
Is shorter than the initial distance a by an amount corresponding to Δa = 1−acos (θ + α), so that the tension acting on the web w can be reduced correspondingly.

FIG. 3 shows another embodiment of the present invention.
A guide plate 20 is fixed on a frame located immediately below one of the connecting pieces 3, a guide groove 21 is provided on the surface thereof, and a pin 22 is provided in this guide groove 21 on the lower surface of the free side of the connecting piece 3. And the connecting piece 3 is swung together with the rotation of the support punch 6, so that the tracking roller 2 supported on its free end is axially displaced by a required distance. is there.

(Effects) As described above, according to the present invention, a parallelogram link unit is formed by two rollers and left and right connecting pieces supporting the rollers, and the connecting piece is rotated with the rotation of the link unit. By moving the link unit, the roller on the lower side in the transport direction is displaced in the axial direction by an amount corresponding to the traverse amount of the web. It is possible to stably move the axis of the web in the lateral direction without causing relative axial movement between the webs, and to reduce wrinkles and the like caused by tension imbalance on both sides of the web that occur during adjustment. Occurrence can be suppressed beforehand.

Moreover, since the rollers on the lower side in the transport direction are displaced in the axial direction using the parallelogram link, the distance between the two rollers can be reduced simultaneously with this displacement, and the web The increase in the tension generated during the lateral movement operation can be reduced correspondingly, and the adjustment of the axial position during the web transfer process can be performed stably.

[Brief description of the drawings]

FIG. 1 is a principle view of an apparatus showing one embodiment of the present invention, FIG. 2 is an explanatory view showing the operation of this apparatus, and FIG. 3 is a principle of the apparatus showing another embodiment of the present invention. FIG. 4 is an explanatory view showing a state at the time of adjusting the axial position of the web by the conventional apparatus. DESCRIPTION OF SYMBOLS 1 ... Guide roller, 2 ... Tracking roller 3 ... Connection piece, 6 ... Support punch 10 ... Lever for tracking roller movement 16 ... Continuous punch, 20 ... Guide plate 21 ... Guide groove

Claims (1)

(57) [Claims] 1. A parallelogram link unit comprising a pair of rollers disposed at intervals in a web transport path and a pair of left and right connecting pieces supporting the shaft ends of the two rollers. The link unit is supported so as to be rotatable within the transport plane of the web, and the roller on the lower side in the transport direction of the web is displaced in the axial direction by an amount corresponding to the traverse amount of the web in conjunction with the link unit. An apparatus for adjusting the position of an axis of a running web provided with means for rotating a connecting piece.