JPH04361072A - Printing medium oblique motion correcting mechanism - Google Patents

Abstract

PURPOSE:To correct oblique motion of a printing medium on a medium carrying route just before or the like a printing mechanism part by a method wherein for a medium of which a width is larger than the distance between a block hit against with a medium and an oblique motion correcting block, the oblique motion correcting block is carried under a state wherein it is sunk below a paper guide. CONSTITUTION:Where a medium of width 1 is approaching travelling, the width of the medium is detected with photosensors 10, 11, and a stepping motor 4 starts driving. A drive pulley 5, a timing belt 6, a pulley with a gear 7, and a lead screw with a gear 8 are linked therewith to raise an oblique motion correcting block 1 in the gear arrow (a) direction through a hole provided to paper guide 2. When the oblique motion correcting block 1 has been raised in the arrow (a) direction, the medium of the width 1 is guided by both sides of a block 3 hit against with a medium and the oblique motion correcting block 1. When the medium has passed therethrough, oblique motion of the medium is corrected.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for correcting skew feeding of a printing medium, which is provided in an apparatus for conveying a printing medium.

0002

[Prior Art] Conventionally, this type of mechanism for preventing skewing of printing media detects the intake angle of the media using a photo sensor or the like when the media is sucked in, and if the intake angle of the media is not within a specified value, the media is not allowed to enter the device. I was careful not to inhale it. However, it was not possible to correct the skew of the printing medium during transportation or immediately before printing.

0003

[Problem to be Solved by the Invention] This conventional printing medium skew prevention mechanism detects the skew of the medium using a photo sensor near the suction port when it is sucked in, and if the skew of the medium during suction is not within a standard value. Although it is not inhaled, this standard value is strict, so the medium must be set accurately on the contact surface. Furthermore, when the medium is skewed during conveyance, the skew cannot be corrected, resulting in paper jams and printing defects.

0004

[Means for Solving the Problems] The printing medium skew correction mechanism of the present invention comprises: a paper guide on which the medium is conveyed; a skew correction block that moves up and down through a hole provided in the paper guide; a stop block with a medium fixed to one side of the paper guide, and if the width of the medium is larger than the distance between the stop block with the medium and the skew correction block, the skew correction block is fixed to the lower side of the paper guide. The medium is conveyed in a sunken state, and the medium whose width is the same as the distance between the medium attachment block and the skew correction block is conveyed with the skew correction block raised above the paper guide.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a sectional view of an embodiment of the present invention in an operating state, and FIG. 2 is a side view of FIG. 1 viewed from the right.
FIG. 3 is a side view of this embodiment in a non-operating state.

The medium is conveyed on the paper guide 2 in the direction of arrow c. A screw nut 9 fixed to the skew correction block 1 is threaded onto the geared lead screw 8, and as the geared lead screw 8 rotates, the skew correction block 1 moves up and down.

The skew correction block 1 is normally lowered in the direction of the arrow b as shown in FIG. 3, so that a medium exceeding the width l shown in FIG. 1 can run without any trouble. When a medium with a width l is running, the width of the medium is detected by the photosensors 10 and 11, and the stepping motor 4 starts to drive, and the driving pulley 5, timing belt 6, geared pulley 7, and geared lead screw 8 are activated. , and lift the skew correction block 1 through the hole provided in the paper guide 2 in the direction of arrow a. When the skew correction block 1 is lifted in the direction of the arrow a, the medium of width l is guided from both sides by the medium abutment block 3 provided on one side of the paper guide 2 and the skew correction block 1, and when it passes there. The skew of the medium is corrected.

[0009]

As described above, the present invention has the effect of correcting the skew of the printing medium on the medium conveyance path immediately before the printing mechanism section.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention in an operating state.

FIG. 2 is a side view of FIG. 1 viewed from the right.

FIG. 3 is a side view of the embodiment in a non-operating state.

[Explanation of symbols]

1 Skew correction block 2 Paper guide ３　　　　　　　Attaching block with media 4 Stepping motor 5 Drive pulley 6 Timing belt 7 Geared pulley 8 Geared lead screw 9 Screw nut 10, 11 Photo sensor

Claims (1)

[Claims] 1. A paper guide on which a medium is conveyed, a skew correction block that moves up and down through a hole provided in the paper guide, and a medium stopper block fixed to one side of the paper guide. A medium whose width is larger than the distance between the medium abutment block and the skew correction block is conveyed with the skew correction block sunk below the paper guide, and the width is larger than the distance between the medium abutment block and the skew correction block. A printing medium skew correction mechanism characterized in that a medium having the same distance between the skew correction blocks is conveyed with the skew correction blocks raised above the paper guide.