JPH0744480Y2 - Image forming device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial application field" The present invention relates to an image forming apparatus for recording an image by using a roll paper, and particularly, an image forming in which the front end of the roll paper can be easily cut and aligned. Regarding the device.

“Prior Art” Many copiers are equipped with a platen glass on which an original is placed, and the platen glass itself is moved in a predetermined direction, or an optical system arranged under the platen glass is scanned. Thus, the image of the original is slit-exposed on the photoconductor.

In a copying machine of this type, since the original is fixed on the platen glass for exposure, the size of the original needs to be equal to or smaller than the maximum size of the platen glass. If the original is larger than this, it is necessary to divide the original and make copies of the individual parts, and then attach them together. In order to avoid such work, the platen glass needs to be particularly large, and the optical system also becomes large, so that the copying machine itself becomes large and expensive. Even if the platen glass is made large, it is actually impossible to prepare a platen glass of such a size for a document having a side of several meters.

Therefore, for example, for a sheet-shaped document such as a long drawing whose one side is several meters long, the document is not fixed on the platen glass, but is moved on the platen glass at a constant speed. There is used a copying machine of a type in which a slit exposure is performed on a photoconductor.

FIG. 7 shows a conventionally proposed paper feeding mechanism of a copying machine and its periphery. The paper supply mechanism 10 can set _two supply rolls 11 ₁ and 11 ₂ and can supply the paper alternatively from these. Further, it is also possible to manually feed a sheet cut to an arbitrary size from the manual sheet feed table 55. Supply roll
The papers 12 ₁ and 12 ₂ wound around the rolls 11 ₁ and 11 ₂ are fed by the drive-side and driven-side feed rollers 13 ₁ , 13 ₂ , 14 ₁ , and 14 ₂ , respectively, and the respective supply rolls 11 ₁ , 11 ₂ are guided by guides 15 ₁ and 15 ₂ provided in correspondence to the same conveyance path. A pair of takeaway rollers 16 and 17 are arranged in this unified transport path.
One of the selected sheets 12 ₁ or 12 ₂ is conveyed to the cutter mechanism 18. Unless otherwise specified below, one of the paper
₁ will be described. In this case, the supply roll 11 ₁ will be referred to as the supply roll 11 and the paper 12 ₁ will be referred to as the paper 12.

A sensor 87 ₁ for detecting the leading end of the conveyed paper 12 is arranged in front of the cutter mechanism 18. A sensor 87 ₃ for controlling the loop amount of the paper 12 is arranged above the cutter mechanism 18. The sheet 12 that has passed through the cutter mechanism 18 passes through the guide 19, the driving side and driven side registration rollers 21 and 22, and the other guide 23, and then the photosensitive drum.
It is transported to 24 transfer positions. A sensor 87 ₂ is also arranged in front of the registration rollers 21 and 22 to detect the leading edge of the paper 12. At the transfer position of the photosensitive drum 24, a transfer corotron 25 for transferring the toner image to the paper 12
And a detack corotron 26 for improving the peelability of the paper 12 after transfer.

In this paper supply mechanism 10, even precut paper can be manually inserted into the copying machine. When a paper is manually fed from the manual paper feeding table 55, the paper is fed by three pairs of feed rollers 31 ₁ , 32 _{2 to} 31 ₃ , 3.
Transported to the location of the guide 19 through the 2 _3, and is conveyed to the transfer position of the photosensitive drum 24 passes through registration rollers 21 and 22 and the guide 23 from here.

With such a paper feeding mechanism 10, the feed roller on the drive side
13 ₁ and 13 ₂ are adapted to receive the driving force from the paper feed motor 35 via the corresponding electromagnetic clutches 34 ₁ and 34 ₂ .
The registration roller 21 on the driving side receives the driving force from the paper feeding motor 35 via the clutch 37. Feed rollers 13 _1, 13 ₂ and the resist rollers 21 each electromagnetic brake 96 ₁ to 96 _2, 96 ₃ are mounted, the brake is applied to the rotation of these rollers when the transmission of the driving force is turned off It is like this. A spring clutch 38 is attached to the registration roller 21 on the driving side, and the registration roller 22 on the driven side is moved up and down by the action of the solenoid 39.
The nip between and can be released.

The photoconductor drum 24 to which the paper 12 is supplied in this copying machine is rotated by the main motor 41. The drive sources of the paper supply mechanism 10 and the photoconductor drum 24 are different from each other because they are separable from each other along the dashed-dotted line 42 in FIG.

In the copying machine having the paper supply mechanism 10 as described above, the following work is performed when setting the roll paper.

(A) Unpack the supply roll 11 and set it in a predetermined position of the paper supply mechanism 10.

(B) The nip between the feed rollers 13 ₁ and 14 ₁ is released, and the leading end of the paper 12 of the supply roll 11 is re-nipped through the gap between them.

After that, when the copying operation of the copying machine is started, the paper 12 is automatically sent out and used for copying from the leading end thereof.

"Problems to be solved by the invention" However, depending on the supply roll, the leading end of the paper 12 may not be cut at a right angle to the longitudinal direction.
When such a sheet 12 is used, the image may be chipped at the leading end. Even if the tip is cut correctly, it may be damaged by tearing or wrinkling the tip before unpacking and setting the paper feed roll in the paper feeding mechanism 10. It may end up. Even if the paper 12 is conveyed by nipping it between the feed rollers 13 ₁ and 14 ₁ , the paper jam may occur inside the device, the image may not be recorded accurately at the leading edge of the paper, or the image may be missing. Generate.

Therefore, in the conventional case, when the front end of the paper 12 is broken or cut obliquely, the paper supply mechanism 10 is separated by the one-dot chain line 42.
The work was to separate the paper from the main body of the device, manually set the paper, and then connect it again to the main body of the device.
That is, first, the nip between the feed rollers 13 ₁ and 14 ₁ is released, the sheet 12 is passed through, and the sheet 12 is conveyed along the guide 15 ₁ so that the damaged portion of the leading end of the sheet 12 and the like moves the cutting position 101 of the cutter mechanism 18. I tried to pass. Then, after this, the cutter mechanism 18 is manually operated to cut and align the leading ends of the sheets 12.

Since this kind of work is quite difficult, conventionally, for the paper 12 whose tip is damaged or is cut diagonally, cut this tip with a cutter knife or scissors (automatically) and perform the setting automatically on the machine side. It was common to let them. However, with a wide roll paper or a very thin roll paper, accurate cutting is not performed, and on the contrary, there are many cases where "wrinkles" are generated or the leading end portion is obliquely cut again. In addition, when trying to cut accurately, it was necessary to draw a line at the portion to be cut using a ruler or bring a cutter for cutting general paper to cut. In the former case, it takes time to cut, and in the latter case, not only the trouble of carrying the cutter is required, but also a large cutter is needed to cut a large size roll paper. was there.

Therefore, an object of the present invention is to provide an image forming apparatus capable of easily trimming the leading ends of roll paper.

"Means for Solving the Problems" In the present invention, (i) an image recording unit including a photoconductor and the like;
(Ii) a roll paper supply mechanism that supplies roll paper as recording paper to the image recording unit, and (iii) a guide that guides the leading end of the roll paper pulled out from the roll paper supply mechanism in a predetermined direction. The image forming apparatus is equipped with a table having slit-shaped cutter grooves provided in a direction orthogonal to this direction.

That is, in the present invention, the leading end of the roll paper pulled out from the roll paper supply mechanism is directed along the guide on the table in a predetermined direction, and in this state, the roll paper is set in this direction by the cutter groove provided on the table. Cut at right angles.

If the table can be pulled out, it will not get in the way except when it is used. In addition, if the guideline for each size of roll paper is written on this table, or if the guide plate that lays the side of the roll paper along the direction orthogonal to the cutter groove is arranged, when cutting the tip part, It is convenient.

[Examples] Hereinafter, the present invention will be described in detail with reference to Examples.

Outline of Copying Machine FIG. 2 shows the appearance of a copying machine according to an embodiment of the present invention. The internal structure of this copying machine is the same as that shown in FIG. On the front surface of the copying machine 51 in FIG. 2, a document table 52 is horizontally arranged so as to be freely drawn out, and a document is inserted from here along a document insertion guide 53. The inserted original is
The paper is advanced on the conveying path 11 shown in FIG. 7 and is discharged onto a document tray 20 arranged on the upper part of the apparatus main body.

Below the document table 52, the paper feeding mechanism 10 shown in FIG.
An automatic paper feeding device 54 accommodating the above is arranged. The automatic paper feeding device 54 is provided with paper feeding rolls 11 ₁ and 11 _{2 of} two systems as shown in FIG. Of course, depending on the apparatus, the paper feed rolls of more systems may be arranged, or the number of paper feed rolls may be decreased. Two-system paper feed rolls 11 ₁ , 1
Paper 12 fed from either 1 or ₂ (see Fig. 7)
After being cut by the cutter 18 as shown in FIG. 7, the toner image is transferred and fixed, and is discharged onto the discharge tray 48. As shown in FIG. 2, the discharge tray 48 is actually arranged on the original tray 20 so as to partially overlap.

The automatic paper feeder 54 can be pulled out for convenience, such as when removing a jam.
A manual paper feed table 55 is arranged between the automatic paper feeder 54 and the original table 52. This is to allow the user to manually insert a special size sheet or the like that is not set in the copying machine 51.

Behind the document table 52, the main control panel 57
And the sub control panel 58 is arranged. The main control panel 57 is provided with buttons and display lamps necessary for operating various functions. The sub-control panel 58 is provided with knobs for "toner increase", "density adjustment (light amount)", "reduction ratio adjustment", "toner adjustment", and the like. This copier is a remote control
59 can be used, which allows editing (trimming).

Configuration of Manual Paper Sheet Table FIG. 1 shows a manual paper table used in this embodiment. The manual feed paper table 55 is a flat plate having a wider width than the maximum width roll paper used in this copying machine, and the manual feed paper insertion port 111 is laterally arranged at the center thereof. A plurality of guide lines 112 are printed on the upper surface of the manual feed paper table 55 in front of the manual feed paper insertion port 111 in the feeding direction of the paper to be manually fed. These guide lines 112 are for setting the paper at the position corresponding to the size when manually cutting the previously cut paper. At the tip portion 55A of the manual paper table 55, a cutter groove for guiding the cutting edge of a cutter usually used when cutting paper is used.
113 is provided.

FIG. 3 shows the relationship between the manual paper feed table and the automatic paper feeder shown in FIG. The manual paper feed table 55 is attached to the upper panel 121 of the automatic paper feeder 54 so as to be movable in the direction of arrow 122. As shown in FIG. 2, the manual feed paper table 55 normally has a front end portion 55.
A is retracted to a position that coincides with the extension line of the opening / closing door 123 of the automatic paper feeder 54. When manually feeding the paper or cutting the leading end of the roll paper as in this embodiment, the paper is pulled out forward (to the right in the drawing) as shown in FIG.

A method of cutting the leading end of the paper pulled out from the paper feed roll will be described with reference to FIGS. 4 and 5. The operator first attaches the paper feed roll 11 to the paper feed roll mounting shaft 131 in the automatic paper feeder as shown in FIG. Then, the front end of the paper 12 is pulled out, and if the paper 12 is damaged or cut obliquely, the paper front end portion 12A is placed on the manual paper table 55.

The operator then causes the side of the sheet 12 to follow the guideline 112 corresponding to the width of the sheet 12, as shown in FIG. Since the paper feed roll 11 is attached to the paper feed roll mounting shaft 131 at a position corresponding to each size, the longitudinal direction of the paper 12 pulled out from the paper feed roll 11 is perpendicular to the cutter groove 113. Come to do.

In this state, the operator uses one hand 133 to
When the sheet is pressed against the manual feed paper table 55, the cutter 134 is held by the other hand 135 and cutting is performed along the cutter groove 113, the leading end of the paper 12 is cut correctly.

After this, as already explained in FIG. 7, the feed roller
The leading edge of the paper 12 may be passed between 13 ₁ and 14 ₁ .

The procedure up to unpacking and setting the paper feed roll 11 in the automatic paper feeder 4 has been described above. However, even when a paper jam occurs during the copying operation, the leading edge of the paper 12 is shown in FIG. It can be cut by the method as shown and set again in the device.

FIG. 6 shows a table as a modified example of the present invention. The table 141 may be a manual sheet table or a document table for inserting a document. Of course, it may be a dedicated table for cutting the paper. A cutter groove 142 is also provided in the tip portion 141A of the table, and the paper is cut along the cutter groove 142. Further, an E-shaped guide plate 143 which is slidable in the longitudinal direction is arranged on the table 141. This guide plate 143
The convex portion 143A located at the center of is fitted into the cutter groove 142.

In the table of this modified example, cutting may be performed by the cutter 134 shown in FIG. 5 with the side of the paper 12 along the guide plate 143. In this modification, the guide plate 143 is used to determine the direction of the side portion of the paper 12, but the cutting teeth are arranged on the guide plate 143 to cut the paper 12 by moving the guide plate 143. You may

[Advantages of the Invention] As described above, according to the present invention, a guide that guides the leading end of the roll paper drawn from the roll paper supply mechanism in a predetermined direction and a slit provided in a direction orthogonal to this direction. Since a table with a circular cutter groove was prepared, the tip of the roll paper set in the image forming apparatus can be easily cut at right angles to the longitudinal direction, and the tip of the cut paper can be directly used in the apparatus. Since it can be set, there is no fear that the tip portion will be damaged again as compared with the case of using a cutter prepared outside the apparatus.

Further, if the table is arranged so that it can be pulled out from the apparatus, the table can be pulled out and used in a required amount when necessary, and there is no obstruction when not in use. Furthermore, by drawing a guideline on the surface of the table, it is convenient because it can be used for positioning even when manually feeding a sheet that has already been cut. Further, if the direction of the paper is set using the guide plate, there is an advantage that the cutting direction can be easily determined.

[Brief description of drawings]

1 to 5 are for explaining one embodiment of the present invention, in which FIG. 1 is a perspective view showing the external appearance of a manual feed paper table, and FIG. 2 is a copy using the manual feed paper table. Fig. 3 is a perspective view of the machine, Fig. 3 is a side view of the essential parts showing the relationship between the manual paper feed table and the automatic paper feeder, and Fig. 4 is a state in which the leading end of the paper pulled out from the paper feed roll is placed on the manual paper feed table. FIG. 5 is a perspective view of a main part showing a state in which the leading end of the paper is cut, FIG. 6 is a perspective view showing a modified example of the table, and FIG. 7 is a paper supply mechanism of a copying machine. It is a schematic block diagram showing the periphery. 11 …… Supply roll, 12 …… Paper, 12A …… Paper tip, 24 …… Photosensitive drum, 31, 32 …… Feed roller,
35 ... Paper feed motor, 55 ... Manual paper table, 112 ...
… Guideline, 113, 142 …… Cutter groove, 121 …… Upper panel, 143 …… Guide plate.

Claims (1)

[Scope of utility model registration request] 1. An image recording unit for recording an image, a roll paper supply mechanism for supplying roll paper for recording to the image recording unit, and a leading end of the roll paper pulled out from the roll paper supply mechanism. An image forming apparatus comprising: a table having a guide for moving the sheet in a predetermined direction, and a table having a slit-shaped cutter groove provided in a direction orthogonal to this direction.