JPS5889551A - Web end corrector in web press - Google Patents

Abstract

PURPOSE:To both prevent a film from contacting to a head groove and perform detection with low pressure air, by turning a detecting head interlocking to correcting movement of an end face. CONSTITUTION:A device is constituted such that interlocking to movement (position as shown by broken lines) of corrector guide rolles 4, 4', a detecting head 5 is moved to the position of a head 5', and the head 5 is turned about a film contact position of a fixed guide roller 3' to place a head groove almost in parallel to a running film. In this way, the film can be prevented from rubbing, stain, paper cut, etc. due to the head 5, while a width of the groove can be decreased to reduce pressure of air.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a web end surface correction device for a web (film) printing machine.

More specifically, the present invention relates to a mechanism for correcting the set position of a detection head during web correction in a web end face correction device.

A conventional web end face correction device will be explained with reference to FIGS. 1 to 4.

FIG. 1 is a perspective view showing the appearance of the web correction device;
The transporting film 1 passes through a fixed guide roller 3 and a web correction guide roller 4.4' detection head 51. This is suitable for a structure in which the paper is fed through a fixed guide roller 3'.

6 is a mounting base for film edge correction device, 7 is a correction base,
8 is the bearing for the guide roller 4.4'.
The figure shows a cross-sectional view of the detection head 5, where 9 is an inlet of detection air and 10 is an outlet thereof.The air flows in the direction of the arrow, and the pressure of the air changes depending on the position of the end face of the transport film 1. 11 is a bar connected to the detection head 5, 12 is a position adjustment arm, 13 is a fixing bolt, 14 is a mounting support, and 15 is a frame e-j. The position of the frame 15 is used as a reference to control the feeding film to the end position.

The basic principle of the web correction device is shown in FIG. 3. The feeding film 1 corrects the deviation δ of the feeding film 1 by the correction operation angle θ of the two parallel guide rows 24 and 4' of the correction device. This deviation δ is detected by the detection head 5, and the two parallel guide rollers 4.4' are rotated. At this time, as shown at 16 in FIG. 4 (showing a side view of FIG. 3), the transport film 1 comes into contact with the groove side surface of the detection head 5. Such contact will cause stains, paper cuts, etc. on the transport film 1. Detection head 5 to avoid contact.
When the groove width is widened, the air pressure increases to l - J'1. t
Inevitably, if the air pressure is increased, the edges of the film may be pinched by the air pressure when the film is thin, resulting in poor filter position accuracy. In addition, in order to prevent the detection head groove from coming into contact with the groove, it is possible to install a guide bar or the like at the entrance of the detection head, but in this case, the contact will be uneven and wrinkles will easily occur. [One object is to provide a web end face position correction device that prevents the film from coming into contact with the detection head groove and can detect the position using low pressure air.

The structure of the present invention is that a mechanism is provided for rotating the detection head in conjunction with the film edge correction movement so that the feeding surface for performing edge correction is aligned approximately at the center of the groove of the detection head parallel to the groove wall. It is characterized by:

Hereinafter, the present invention will be specifically explained with reference to embodiments illustrated in the drawings. FIG. 5 shows a principle diagram of the present invention, in which the detection head 5 moves in conjunction with the movement of the correction device guide rollers 4 and 4' (positions indicated by broken lines) [2 and moves to the position 5', and the fixed guide roller The detection head 5 rotates around the entire center of the film contact position #3', and the head groove becomes almost parallel to the feeding film.

FIG. 6 is a plan view of an embodiment of the present invention, FIG. 7 is a right side view, and FIG. 8 is a front view. In the figure, a mounting pin 19 is attached to the correction pace 7 of the correction device, and is connected to a guide bracket 21 by a connecting lever 20. The guide bracket 21 is supported by a guide bar 22 and moves parallel to the frame 15. A detection head mounting shaft 27 is rotatably attached to the guide bracket 21, and a detection head rotational position correction bar 26 is fixed to the frame 15 via a spherical bearing 24 with a spherical bearing frame bolt 25. This fixed position is the film tangent position of the fixed guide roller 3'. As shown in FIG. 8, the detection head 5 is mounted on a detection head mounting shaft 27 with bolts 12 while adjusting the head position. As shown in the figure, the feeding film 1 is always positioned parallel to the substantially center of the detection head 5 in the groove width direction.

As mentioned above, by using the unexploded IJI, it is possible to prevent the transport film from coming into contact with the side surface of the groove of the detection head, thereby preventing scratches, stains, paper cuts, etc. caused by the detection head, and furthermore, it is possible to reduce the groove width. As a result, air pressure can be lowered, and the film, etc., does not bleed, resulting in improved accuracy.

[Brief explanation of drawings]

Fig. 1 is an external perspective view of a conventional web end face correction device, Fig. 2 is a sectional view of the detection head in Fig. 1, Fig. 3 is an illustration of the basic principle of the web correction device, and Fig. 4 is a diagram of the conventional device. 5 is a diagram illustrating the principle of the present invention, FIG. 6 is a plan view showing an embodiment of the present invention, FIG. 7 is a right side view, and FIG. 8 is a front view. 1... Transport film, 3.3'... Fixed guide roller 4.4'... Guide roller for end face correction, 5... Detection head, 7... Correction pace agent Patent attorney Usui 1) Toshiyuki

Claims (1)

[Claims] While the film end face is fed into a groove with parallel groove walls, air is discharged to the end face and the air pressure difference is detected, thereby detecting the position of the film end face. In a device for correcting a film end face by rotating a correction guide roller, the film end face correction movement is interlocked with the film end face correction movement so that the surface of the transported film whose end face is to be corrected is parallel to the groove wall at approximately the center of the groove of the detection head. A web end face correction device characterized by comprising a mechanism for rotating a detection head.