JPS6410353B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a paper feeding device that feeds continuous paper using a tractor, and when loading new paper into the tractor unit,
The present invention relates to a paper loading device that reliably engages a paper leading end transport hole with a transport protrusion of a tractor.

Conventionally, the method of engaging the transporting hole of a new sheet with the transporting protrusion of the tractor was to engage the paper in advance with an auxiliary tractor that is linked with the tractor, and then drive the auxiliary tractor to transfer the next paper using its transporting force. There is a method in which paper is fed to a tractor and a paper transport hole engages a transport protrusion of the tractor. In this method, the auxiliary tractor is driven even after the paper has been loaded into the tractor, which increases the load on the drive motor accordingly, making it particularly difficult to print pages of paper by rapidly accelerating the tractor. Furthermore, since the method involves pushing the paper into engagement with the tractor from the auxiliary tractor, it may be difficult to engage the paper depending on the quality of the paper, which poses a problem in terms of reliability.

An object of the present invention is to provide a paper feeding device that feeds continuous paper using a tractor, and to provide a paper loading system in which the leading end conveyance hole of the paper is surely engaged with the conveyance protrusion of the tractor when loading new paper into the tractor unit. The purpose is to provide equipment.

In order to achieve the above object, the paper loading device of the present invention is a paper feeding device that continuously feeds paper by engaging the transport holes at both ends of the paper with the transport protrusions of a tractor. A paper presser is provided which is rotatable so as to set one position and another position for loading paper, and the tip of the paper presser is provided with a conveyance protrusion of a tractor when the presser is set on a conveyance path. A plate having a plurality of protrusions arranged at corresponding positions is provided so as to be elastically retractable slightly in the direction of rotation, and when the paper presser is rotated from the paper loading position, A stopper is provided for retracting the provided protrusion in the rotational direction immediately before it reaches the conveying protrusion of the tractor, and for removing the sheet loaded on the protrusion of the plate from the protrusion of the plate and engaging it with the conveying protrusion of the tractor. It is characterized by:

FIG. 1 is an overall explanatory diagram of a paper feeding device of an electronic printing press as an embodiment of the present invention.

In the figure, a photosensitive drum 1 is uniformly charged by a charger 2, and then image information is exposed by an optical system 3. Since the surface potential of the photosensitive drum 1 decreases in the exposed portion, image information based on light is converted into an electrostatic pattern. Next, it is developed by a developing machine 4 to become a visible image.

On the other hand, the paper 5 is conveyed to the transfer section 6 while the surface speed of the photosensitive drum 1 is controlled simultaneously. The visible image is transferred onto the paper 5 in the transfer section 6 .

The visible image remaining on the photosensitive drum 1 is completely removed by the cleaning brush 21. tractor 7,
8 is used to convey the paper 5 with precision;
In particular, in order to prevent the paper 5 from moving in the axial direction of the photosensitive drum 1 in the transfer section 6, tractors 7 and 8 are arranged to narrow the transfer section 6. The transferred visible image is heat-fixed in the fixing section in the next step and finished as a printed matter.

Paper 5 rises from hopper 9 and moves to paper guide 1.
0, the paper passes over the paper presser 11 and is guided to the tractor 7 and the transfer section 6.

The paper presser stand 11, which is the main part of the present invention, can be rotated around a shaft 23, and the restoring force of the spring 20 allows the tractor 7 to rotate.
is pressed against the conveying surface. In order to maintain an appropriate gap between the transport surface of the tractor 7 and the surface of the paper presser stand 11, a stopper 1 is installed at a position away from the paper transport path.
9 is provided.

FIG. 2 is a detailed explanatory diagram of the paper presser which is the main part of the present invention.

This figure shows a state in which the sheet presser 11 is horizontal and the conveying hole for the sheet 5 is engaged with the protrusion 13. The stopper 39 is for keeping the paper presser 11 horizontal, and the restoring force of the spring 20 keeps the paper presser 11 horizontal.
1 is pressed against the stopper 39. The protrusions 12 are disposed on blocks 14 built into a fixing mechanism separate from the paper presser 11, and two blocks 14 are used, one on the front side and the other on the back side, corresponding to the conveyance holes at both ends of the paper 5. .

When the paper presser 11 is rotated in the direction of arrow A, the protrusion 12 comes off from the paper presser 11. The protrusion 13 is arranged on a plate 15, and the plate 15 has a spring-loaded hinge 1.
6, it is fixed to the paper presser stand 11. Due to the restoring force of the spring, the plate 15 presses the paper presser stand 11 with a certain constant pressure. The transport hole at the leading edge of the paper is a protrusion 13
If the paper 5 is engaged in this order, the paper 5 will not be able to return to the hopper 9 due to its own weight.

From the state where the paper 5 shown in FIG. 2 is loaded, the third
As shown in the figure, when the paper presser 11 is rotated in the direction A, the transport hole for the paper 5 first comes out of the protrusion 12 fixed to the block 14. However, since the paper 5 is supported by the protrusion 13, the hopper 9
Paper 5 does not move backwards.

When the paper presser 11 is further rotated, the stopper 17 collides with a part of the plate 15 and cannot rotate together with the paper presser 11, as shown in FIG. I started to get out of the
Finally, only the protrusion 13' is in a state where it is in contact with the conveyance hole for the paper 5. Naturally, the stopper 17 is configured so as not to hit the paper presser stand 11.

Next, as shown in FIG. 5, as soon as the protrusion 13' comes out, the transport hole for the sheet 5 enters the tractor protrusion 18' facing the protrusion 13', and each hole sequentially moves to each protrusion 18'. is set to

Since this series of operations is completed in a short period of time, the wind pressure applied to the paper 5 on the paper presser stand 11 during rotation is large, and the moment the paper 5 completely comes out of the protrusion as shown in FIG. Do not go back to Hotsupa 9.

According to this embodiment, if the conveyance hole is engaged with the projection of the plate 15 of the paper holding table 11 in advance, then the paper 5 can be automatically engaged with the conveyance projection of the tractor. As a result, paper 5
can be loaded onto the tractor 7.

The following FIGS. 6 to 8 show other embodiments of the present invention, and the difference from FIG. 1 is that the paper presser is applicable even when the width of the paper 5 is different. FIG. 6 is a plan view of the main part, FIG. 7 is a side view of the main part, and FIG. 8 is a detailed sectional view taken at - in FIG. 6.

In line printers and electronic printing machines, paper widths often vary depending on the form, and it is often not possible to standardize paper to the same width due to past practice. In such a case, conventionally, the tractor was moved in the width direction in accordance with the width of the paper, and after the paper was loaded, fine adjustment in the width direction was finally performed.

As shown in FIG. 1, the tractors 7 and 8 are arranged so that the transfer unit 6 is narrowly spaced, and in order to visually adjust the paper width direction, the upper tractor 8
The position was too high, making it difficult to adjust due to the large parallax, and the disadvantage was that it was easy to neglect the fine adjustment work that had to be done after loading.

In FIG. 6, the lead screw 2 is
When turning 5, the block 27 that engages with the lead screw 25 moves. Lead screw 2 of block 26
The portion through which the lead screw 5 passes is a hole so that it does not engage with the lead screw 25. The block 26 is fixed in advance with fixing screws 38 in alignment with the printing position. The oblong hole 28 is for allowing a protrusion 29 protruding from the surface of the paper presser stand 30 to move.

The groove 31 is provided to prevent the protrusion of the tractor from colliding with the paper presser 30 when the paper presser 30 approaches the tractor.

The movable table 32 is a table that moves according to the width of the paper, and is a table that moves according to the width of the paper.
The protrusions of both tractors enter 3. The hole 40 is for allowing the movable base 32 to move. When the lead screw 25 is turned, the block 27 moves, and as shown in FIG. 8, the movable base 32 is structured to sandwich the block 27, so when the block 27 moves, the movable base 32 moves at the same time. Slide part 34, presser foot 3
5, the movable base 32 can be moved without any play, and when the paper presser base 30 is rotated, the movable base 32 can be moved at the same time.
2 can be rotated.

The paper 5 is placed on the paper presser 30 and the paper transport hole and the protrusion of the block 27 are visually aligned, so that fine adjustments can be made at the same time.

Naturally, since the lead screw 25 is connected to a width direction adjustment lead screw (not shown) of the tractor section, the tractor section can also be automatically adjusted in the paper width direction.

The reason why the plate 36 is attached only on the front side and only the groove 33 is provided on the back side is because it is mechanically difficult to attach a stopper to remove the paper from the plate 36, and because there is a tractor above the groove 33, it is difficult to remove the paper by hand. This is because it is difficult to insert a hole for conveyance.

In this way, even if the paper width is changed, the paper can be easily set on the tractor.

As explained above, according to the present invention, the conveyance hole at the leading end of the paper is engaged with the protrusion of the plate of the paper presser, which is provided as a cover for the conveyor protrusion of the tractor, and the paper presser is Just by rotating, the paper conveyance hole can be easily engaged with the conveyance protrusion of the tractor. This reduces the amount of time it takes to engage the paper with the tractor, and has the advantage of being easy to operate.

[Brief explanation of the drawing]

FIG. 1 is an overall explanatory diagram of the embodiment of the present invention, FIGS. 2 to 5 are explanatory diagrams of the operation of the embodiment of the present invention, and FIG.
The figure is a schematic explanatory diagram of another embodiment of the present invention, FIG. 7 is a side view thereof, and FIG. 8 is a sectional view of FIG. 6. In the figure, 1 is a photosensitive drum, 2 is a charger, 3 is an optical system, 4 is a developing machine, 5 is paper, 6 is a transfer unit, 7,
8 is a tractor, 9 is a hopper, 11, 30 are paper pressers, 12, 13, 18, 29 are protrusions, 14 is a block, 15 is a plate, 16 is a spring hinge, 17, 19
25 is a lead screw, and 32 is a movable base.

Claims (1)

[Scope of Claims] 1. In a paper feeder that continuously feeds paper by engaging transport holes at both ends of paper with transport projections of a tractor, the position of the paper feeder on the transport path and the position for loading paper A paper presser is provided which is rotatable so as to be set at another position, and a plurality of protrusions are provided at the tip of the paper presser at a position that coincides with the transport protrusion of the tractor when the presser is set on the conveyance path. The board on which the paper is placed is provided so that it can be elastically moved back slightly in the direction of rotation, and furthermore, when the paper presser is rotated from the paper loading position, the protrusion on the board is moved against the tractor. The paper is characterized by being provided with a stopper that causes the paper loaded on the protrusion of the plate to be removed from the protrusion of the plate and engaged with the protrusion for conveyance of a tractor. Loading device.