JPH0138737B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a roll paper feeding device used in equipment such as electrophotographic copying machines and facsimiles that use roll paper.

Prior Art Conventionally, this type of roll paper feeding device has been constructed as shown in FIGS. 1 and 2.

That is, roll papers 1 and 2 of different widths are rotatably supported, feed rolls 3 and 4 are disposed above each roll paper 1 and 2, and pinch rolls 5 are in contact with the feed rolls 3 and 4, respectively. ,6
are pivotally supported, and an upper buffle 7 and a lower buffle 10 are arranged adjacent to the upper and lower pairs of feed roll 3 and pinch roll 5, and the feed roll 4 and pinch roll 6, and the roll papers 1 and 2 are arbitrarily sorted. feed rolls 3 and 4 respectively
It is sandwiched between pinch rolls 5 and 6, and is sent to an upper buffle 7 and a lower buffle 10, respectively, by rotation of the pinch rolls 5 and 6.

The upper buttful 7 is composed of an upper buttful piece 8 and a lower buttfull piece 9.
is composed of an upper buttful piece 11 and a lower buttful piece 12, and the tip of the lower buttfull piece 9 of the upper buttfull 7 and the tip of the upper buttfull piece 11 of the lower buttfull 10 are located at locations apart from each other. There is. Note that 15 is a top cover of the paper feeding device.

In addition to the above-mentioned conventional example, there is also one in which the lower end of the upper buffle and the upper end of the lower buffle are joined. (Special Publication No. 12210, Publication No. 12210, Special Publication No. 12210, Publication No. 12210)
(See Publication No. 12988) Problems to be Solved by the Invention However, in the conventional roll paper feeding device shown in FIGS. 1 and 2, the roll papers 1 and 2 have downwardly curved curls. Since the lower buttful piece 12 of the lower buttful 10 extends forward from the confluence point 13 without any break, the roll paper 2 passing through the lower buttfull 10 is rotated by the pinch roll 6 without forming a loop. The roll paper 1 is sent to the cutter 14, but since the lower buttfull piece 9 of the upper butthole 7 is inclined and ends at a point away from the lower buttful piece 12 in front of the confluence point 13, the roll paper 1 is guided at the confluence point 13. As the roll paper 1 becomes wider and passes through the upper baffle 7, a loop 1a is formed by the rotation of the pinch roll 4 as shown in FIG. The cut length of the roll paper 1 cut by the cutter 14 is not constant due to the frictional force acting on the roll paper 1, the strength of the curl of the roll paper 1, etc., and the length of the roll paper 1 is not constant. The cutting was not perpendicular to the direction, causing skew. Furthermore, there was a fear that the leading edge of the roll paper 1 fed through the upper buffle 7 at the confluence point 13 would move backward in the lower buffle 10 due to curling.

In addition, even in the case where the lower end of the upper buttful and the upper end of the lower buttful are joined, the width is wider at the end of the joint, so the roll paper conveyed inside the upper buttful has some curling tendency. The formation of a loop similar to that shown in Figure 2 was unavoidable. Also, as above, there was a fear that the vehicle would head backwards inside the rear baffle.

Means and Effects for Solving the Problems The present invention relates to an improvement of a roll paper feeding device that overcomes the above-mentioned difficulties, and its purpose is to:
The object of the present invention is to provide a roll paper feeding device with a simple structure capable of accurately feeding roll paper regardless of the curl of the roll paper, and which consists of a pair of buttful pieces that sandwich and guide the upper and lower surfaces of the roll paper. One of the buttfuls is formed in a substantially straight line, and has a buttful that joins the buttful at an angle, and one of the roll papers conveyed within the plurality of buttfuls is selectively conveyed. In the sheet feeding device, by making the linear buttful side of the merging buttfuls protrude more forward than the other buttfuls adjacent to the buttfuls, at the meeting point of the buttfuls, any of the roll paper Also, the loop is not formed and the material passes through the baffle and is conveyed to the cutting position.

Embodiment An embodiment of the present invention illustrated in FIG. 3 will be described below.

In the paper feeding device shown in FIGS. 1 and 2, the lower buff-full piece 9 is arranged so that the tip 9a of the lower buff-full piece 9 of the upper buff-full 7 is spaced approximately 6 mm from the bottom buff-full piece 12 of the lower buff-full piece 10. 9 is extended by l ₁ , and bent parallel to the bent portion 8b of the upper buttful piece 8, and the upper buttful is bent so that the tip 11a of the upper buttful piece 11 of the lower buttful piece 10 approaches the lower buttful piece 9. The piece 11 is extended by l ₂ , and the tip 8a of the upper buttful piece 8 of the upper buttful 7 and the tip 12a of the lower buttfull piece 12 of the lower buttfull 10 are approximately 30 mm relative to the lower buttful tip 9a of the upper buttfull 7.
The upper buttful piece 8 and the lower buttful piece 12 are formed so as to protrude.

Since the embodiment shown in FIG. 3 is constructed as described above, the roll paper 2 is fed accurately without forming loops, similar to the embodiment shown in FIGS. 1 and 2. Of course, even if the roll paper 1 reaches the confluence point 13, the upper baffle 7
The end 9b of the lower buttful piece 9 is the lower buttful 1
Since the upper buttful piece 11 of 0 does not protrude forward and the guide width is not particularly wide, and is bent approximately parallel to the bending part 8b of the upper buttful piece 8, the curling tendency of the roll paper 1 is corrected. Same double bent part 9b
The roll paper 1 that is fed along is accurately fed without forming a loop.

In this way, incorrect feeding of the roll paper 1 due to loop formation is prevented, so there is no error in the cut length of the roll paper 1, and the roll paper 1 is cut at right angles to its longitudinal direction, preventing skew from occurring. is prevented.

In the embodiment shown in FIG. 3, there were two sheets of roll paper, but in the example shown in FIG. 4, there were three sheets.
It is made to protrude longer than the baffle piece of the buffle 17 with a smaller curling tendency adjacent to the lower part thereof, and the same is true for the buffles 17 and 18, and the same effect as that of the embodiment shown in FIG. 3 can be achieved.

Effects of the Invention In the present invention, as described above, one of the buttfuls made of a pair of buttful pieces that sandwich and guide the upper and lower surfaces of the roll paper is formed in a substantially straight shape, and
It has a buttful that slopes and merges with the buttful,
In a paper feeding device that selectively transports one of the roll papers conveyed through the plurality of buttfuls, at the merging point of the buttfuls, the buttful pieces on the linear buttfull side of the merging buttfuls are By making each buttful piece protrude more forward than the other buttful pieces adjacent to it, each roll of paper can pass through each buttfull and be fed to the cutting position without forming a loop. As a result, it is possible to prevent unevenness in the feeding length of the entire roll paper due to curvature of the roll paper, and unevenness in the feeding length distribution of the roll paper in the width direction of the roll paper. Roll paper can be fed accurately regardless of its curl.

Even if there is a tendency to curl, there is no risk that the roll paper will move backward inside the other buttful at the merging point.

Further, in the present invention, since it is only necessary to appropriately set the lengths of the upper and lower buff-full portions of the buff-full, the structure is simple and the cost is low.

[Brief explanation of drawings]

FIG. 1 is a schematic longitudinal sectional side view of a conventional roll paper feeding device, FIG. 2 is an enlarged vertical sectional side view of its main parts, and FIG. 3 is a schematic diagram illustrating an embodiment of the roll paper feeding device according to the present invention. Fig. 4 is an enlarged longitudinal sectional side view of a main part of another embodiment. 1, 2... Roll paper, 3, 4... Feed roll, 5, 6... Pinch roll, 7... Upper buttful, 8... Upper buttful piece, 9... Lower buttfull piece, 10... Lower buttfull, 11 ...Upper butt full piece, 12...Lower butt full piece, 13...Confluence point, 14...Cutter, 15...Top cover,
16, 17, 18... Batsuful.

Claims (1)

[Claims] 1 One of the buttfuls made of a pair of buttful pieces that sandwich and guide the upper and lower surfaces of the roll paper is formed in a substantially straight line, and has a buttful that joins the buttful at an angle, and the paper is transported within the plurality of buttfuls. In a paper feeding device that selectively transports one of the roll papers, at the meeting point of the buttfuls, the straight piece on the linear buttful side of the merging buttfull is transferred to the other adjacent buttful piece. A paper feed device for roll paper, characterized in that it protrudes forward from a buttful piece of a buttful.