JPH0624612A - Paper sheet carrying mechanism for laser printer - Google Patents

Abstract

PURPOSE:To provide an allowance in engagement between a pin and a paper feed hole to prevent a paper sheet from coming off the pin so. as to prevent breakage by making an interval between mutually opposing pins adjustable in tractors on a carry-in side and a carry-out side, and determining the interval between the mutually opposing pins on the carry-in side relatively large. CONSTITUTION:A paper carrying mechanism is provided with tractors 4 which insert pins 3 in feed holes 2 of a paper sheet 1 for carrying the sheet 1. The tractors 4 are opposingly arranged at a predetermined interval in the width direction of the sheet 1 respectively on a carry-in side and a carry-out side with respect to a photosensitive drum. A belt 6 is arranged on a periphery of the tractor 4 and equipped with pins 3. An interval in the width direction between the mutually opposing pins 3 on the tractors 4 on the carry-in side and carry-out side is constituted adjustable. The interval between the mutually opposing pins 3 on the tractor 4 on the carry-in side is determined larger than that on the carry-out side. Accordingly, the paper sheet 1 passing the tractor 4 on the carry-out side is provided with the appropriate slack, thereby achieving an expected object.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper transport mechanism for a laser printer.

[0002]

2. Description of the Related Art A paper transport mechanism of a laser printer which uses continuous paper, which has feed holes at equal intervals along the transport direction near both ends in the paper transport direction, as printing paper, is arranged at equal intervals with the feed holes. Arranged tractors having a belt provided with the pin on the outer periphery so as to face each other in the paper width direction,
The pins are inserted into the feed holes and the propelling force of the pins conveys the printing paper.

The tractor is constructed to face the photosensitive drum in the vicinity of the photosensitive drum so as to prevent sagging of the printing paper on the photosensitive drum surface and perform optimum transfer.

In this tractor, the operator side is fixed to the frame on both sides of the tractor, and the other side is set so that a desired width setting can be remotely controlled according to the width of the printing paper used.
It is fixedly attached to the wire of a book. The facing intervals of the pins of both tractors are equal and can be set equally by abutting and positioning the tractor on the side fixed to the wire against the frame reference surface.

[0005]

In the above prior art, the printing paper is loaded by the operator's work. Generally, the printing paper is tightly tightened by slightly widening the facing distance of the pins of the tractor from the facing distance of the printing paper feed holes. Set to. By doing this, when the printing paper is conveyed, if there are variations in the accuracy of the feed hole processing of the printing paper, there will be no margin in the printing paper tension direction. It causes problems such as breakage.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a paper transport mechanism of a laser printer which is hard to come off from a pin and can prevent paper breakage.

[0007]

Means for Solving the Problems The above-mentioned object is to make it possible to adjust the width-direction facing distance between the pins of the tractors on the insertion side and the unloading side,
And it is achieved by forming the facing interval of the pin of the tractor on the loading side to be larger than that on the unloading side.

[0008]

Since the above-mentioned means is provided, an appropriate slack is generated in the width direction of the sheet passing through the unloader side tractor side.

[0009]

EXAMPLES Next, the present invention will be specifically described by way of examples.

[Embodiment 1] FIGS. 1 to 3 show an embodiment of the present invention. A continuous paper (printing paper) 1 is provided with a tractor 4 for inserting the pins 3 into feed holes 2 provided at equal intervals along the paper conveyance direction in the vicinity of an end portion in the width direction, and the tractor 4 is exposed to light. The drum 5 is configured to be opposed to each other on the carry-in side and the carry-out side in the width direction of the sheet 1 with a predetermined interval therebetween, and on the circumference thereof, in the same manner as the feed hole 2 of the sheet 1, in the sheet conveying direction. In the present embodiment, a paper conveyance mechanism of a laser printer provided with a belt 6 having pins 3 provided at equal intervals is such that, in the present embodiment, the distance between the pins 3 of the tractors 4 on the insertion side and the unloading side in the width direction is adjustable, and The facing distance between the pins 3 of the tractor 4 on the carry-in side is made larger than that on the carry-out side. By doing so, an appropriate amount of slack is generated in the width direction of the sheet 1 passing through the tractor 4 side on the carry-out side, and the pin of the tractor 4 is pinned even if the feeding hole machining accuracy of the printing sheet 1 varies. 3 and printing paper 1
A margin is given to the engagement of the feed hole 2, and a paper feed mechanism of the laser printer can be obtained in which the paper is not easily disengaged from the pin 3 and paper breakage can be prevented.

That is, the printing paper 1 is a continuous paper having feed holes 2 in the vicinity of both ends along the carrying direction of arrow B in FIG. 1, and pins arranged at equal intervals along the carrying direction. It is conveyed by a tractor 4 having a belt 6 provided with 3 on the outer circumference. The tractor 4 is arranged at a position where the print sheet 1 is carried in and out of the photosensitive drum 5 so as to face the width direction of the print sheet 1.

A tractor 4 on the operator side indicated by an arrow C in FIG.
The (two places) are fixed to the frame 7, and the tractor (two places) on the opposite side is fixed to the wire 8. The wire 8 is wound around the knob 9 several times at an arbitrary position, and by rotating the knob 9 to the left or right, the wire 8 is moved and the tractor 4 is interlocked.

The distance between the pins 3 of the tractor 4 in the width direction is set to D> E, where D is the side on which the printing paper 1 is carried into the photosensitive drum 5 and E is the unloading side. Thus, if the difference F is provided as D> E, the difference F is constant even when the knob 9 is rotated and D and E are changed (see FIGS. 1 and 2 above).

At both ends of the pin facing setting jig 10 (see FIG. 3), set holes 11 are formed at the same intervals as the intervals of the feed holes of the printing paper in the transport direction. The set holes 11 have one end arranged in a straight line, and the other end arranged at opposing intervals G and H,
The set hole 11 is arranged in every jump with a difference I between the facing intervals G and H. Set holes 1 arranged on this straight line
1 is inserted into the pin 3 of the tractor 4 on the operator side that carries the printing paper 1 shown in FIG.
By setting the setting hole 11 provided at the other end into the pin 3 of the tractor 4 on the opposite side and fixing the tractor 4 to the wire 8, the facing distance G = the facing distance D is set. Similarly, the facing distance between the pins 3 on the tractor 4 side that carries the printing paper 1 out of the photosensitive drum 5 is also set to the facing distance H = the facing distance E.

By using the pin facing setting jig of the tractor described above, confirmation and setting can be performed easily and easily.

In FIG. 3, U is provided at both ends of the pin facing setting jig 10.
The groove 12 is attached. The pin facing setting jig 10 has a combined function as a part of the main body cover of the laser printer, and is fixed to the main body by a U groove 12 with a screw.

Reference numeral 13 in FIG. 1 is a wire pulley, and reference numeral 1 in FIG.
Reference numeral 4 is a paper guide, and 15 is a transfer guide.

As described above, according to this embodiment, the following effects can be obtained.

(1) Since it is a paper transport mechanism of a laser printer with an increased margin in the print paper transport direction, it is possible to greatly improve problems in running the paper, such as the feed hole of the print paper coming off the pin of the tractor. You can Further, it is possible to expand applicable paper such as recycled paper having relatively low rigidity.

(2) The sheet conveying mechanism of the present embodiment can be achieved in a simple and easy manner by using a plate-shaped pin facing setting jig.

(3) Since the pin facing setting jig is combined with a part of the cover of the laser printer, the pin facing setting jig can be used as needed, and the sheet conveying mechanism of this embodiment can be provided promptly.

[0022]

As described above, according to the present invention, the widthwise facing distance of the pins of the tractor on the insertion side and the unloading side is adjustable, and the facing distance of the pins of the tractor on the loading side is larger than that on the unloading side. Since it is formed, moderate slack is generated in the width direction of the paper passing through the tractor side on the carry-out side,
Even if there are variations in the accuracy of the printing paper feed holes, the tolerance of engagement between the tractor and the printing paper feed holes will be given a margin so that it will not easily come off the pins and prevent paper breakage. The mechanism can be obtained.

[Brief description of drawings]

FIG. 1 is a development view taken along arrow A in FIG.

FIG. 2 is a front view of an embodiment of the paper transport mechanism of the laser printer of the present invention.

FIG. 3 is a front view of the pin facing setting jig of the embodiment.

[Explanation of symbols]

1 ... Printing paper (continuous paper), 2 ... Feed hole, 3 ... Pin, 4
... tractor, 5 ... photosensitive drum, 6 ... belt, 10 ... pin facing setting jig, 11 ... set hole.

Claims (3)

[Claims] 1. A tractor for inserting a pin into feed holes provided at equal intervals along a sheet conveying direction near an end of a continuous sheet in the width direction to convey the sheet, and the tractor with respect to a photosensitive drum. On the carrying-in side and the carrying-out side, respectively, are arranged so as to face each other in the width direction of the paper at a predetermined interval, and are provided on the circumference of the paper at equal intervals in the paper carrying direction like the paper feeding holes. In a paper transport mechanism of a laser printer including a belt having the pin, the width-direction facing distance between the insertion side and unloading side tractor pins is adjustable, and the facing distance between the loading side tractor pins is A sheet transport mechanism for a laser printer, which is formed to be larger than that on the carry-out side. 2. The width-direction facing distance of the pins of the tractor is adjusted by providing a plate-shaped pin facing setting jig with a set hole corresponding to the feed hole. Paper transport mechanism for laser printer. 3. The sheet conveying mechanism for a laser printer according to claim 2, wherein the plate-shaped pin facing setting jig also has a cover function of the laser printer main body and is always attached to the main body.