JPS61176258A - Setting method for sheet material - Google Patents

Abstract

PURPOSE:To set a sheet material easily and also to avoid the oblique printing to the sheet material CONSTITUTION:When a recording material 1 is set, a plate spring 16 fixed to an.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for separating sheet materials when conveying and setting the sheet materials in the recording section of a facsimile, printer, or electrophotographic copying device.

<Conventional Technology> As shown in FIG.
The sheet is conveyed by a recording head 8 pressed against the roller 3 and printed. After printing, the sheet is cut by a cutter 4 and discharged onto a discharge tray 7 by a discharge roller 5.

When setting a new recording material 1 in the recording section, open the recording section cover and insert the roll-shaped recording material 1 into the recording material holder 2.
When the set switch (not shown) is pressed, the leading edge of the recording material is conveyed to the discharge roller 5 according to the program built in the device. Then, by pressing a cut switch (not shown), the recording material 1 is cut from the cutter position, the cut recording material 1 is ejected onto the ejection tray 7, and the recording material 1 in the device is placed at the cutting edge. The recording material is rewound so that it reaches the position of the recording head 8, and the recording material setting operation is completed.

<Problems to be solved by the invention> In the above configuration, the platen roller 3 when setting the recording material
Since the pressure contact force between the recording head 8 and the recording head 8 is the same as the repulsive force during recording, it is difficult to correct the oblique condition if the recording material 1 is set diagonally, and if the recording operation continues as it is, the recording material 1 There were problems such as printing at an angle to the paper or jamming.

The present invention relates to a completely new technique developed to solve the above-mentioned conventional problems.

Means for Solving the Problems> An embodiment for solving the above problems will be described using a facsimile machine as an example.

1 and 2 are a perspective view and a cross-sectional view of a recording section in a facsimile machine, in which a sheet-shaped recording material (paper, plastic sheet, etc.) 1 wound into a roll is attached to both ends of the recording material. The recording material l is held in a pinched manner by a holder 2, and is conveyed by a platen roller 3.
Furthermore, after being cut by a cutter 4 provided at a predetermined position, the sheet is discharged by a discharge roller 5 and its bank up roller 6 onto a discharge tray 7 which also serves as a recording section cover.

A recording head 8 is in pressure contact with the platen roller 3 and prints predetermined information on the recording material 1 being conveyed, and is rotatably mounted around a shaft 9. A Y-shaped press lever 11 is attached to the back of the recording head 8 and is rotatable around an axis lO.A coil spring 12 is stretched between one end of the lever 11 and the main body of the device, and the other end is comes into contact with the back of the recording head 8, thereby causing the recording head 8 to
When printing, it is pressed against the platen roller 3 with an appropriate force.

Reference numeral 13 denotes a pressure release lever, which is attached so as to be rotatable around a shaft 14. Furthermore, an eccentric cam 15 that interlocks with the lever 13 is attached to the end of the lever 13, and a plate is attached to the eccentric cam 15. A spring 16 is attached.

Further, a microswitch 17 is provided near the eccentric cam 15 and is operated by the rotation of the cam 15, and the recording material setting program built into the apparatus is operated by the operation of the switch 17.

<Effect> Next, the case of setting the recording material 1 will be explained.

First, the ejection tray 7, which also serves as a recording section cover, is opened, and the recording material holder 2 holds the roll-shaped recording material 1, and its leading end is sandwiched between the platen roller 3 and the recording head 4. Next, when the pressure release lever 13 is lifted upward as shown by the arrow a, the eccentric cam 15 rotates clockwise as shown by the arrow A, pushing the micro switch 17 and operating the recording material setting program. As a result, the platen roller 3 and the discharge roller 5 rotate counterclockwise as shown by arrows c and d, and the recording material 1 is conveyed to the discharge tray 7. Next, the operator presses a cut switch (not shown) after confirming that the leading edge of the recording material has been discharged from the discharge roller 5, and the cutter 4 operates to cut the sheet-shaped recording material 1.
The canted recording material 1 is discharged and the recording material 1 inside the device is discharged.
Rewind so that the cut end is at the printing position of the recording head 8, and the setting of the edge material 1 is completed.

During the above setting operation, the plate spring 16 fixed to the eccentric cam 15 presses the recording head 8 in the direction of the arrow e as the pressure release lever 13 rotates and moves. Therefore, during the setting operation, the contact force between the recording head 8 and the platen roller 3 is weakened, and the force with which the recording head 8 presses the recording material 1 is reduced. Although the pressure contact force between the recording head 8 and the platen roller 3 in this case is smaller than the pressure contact force between the two during printing, the plate spring 16 is such that the pressure contact force is sufficient for the platen roller 3 to convey the recording material l. are using.

Now, to explain the tension that acts on the recording material 1 set by the above-mentioned setting operation, as shown by the two-dot chain line in FIG. 3, when the recording material 1 is conveyed in a normal state,
Due to the force in the direction of arrow f due to friction between the recording material holder 2 and the roll-shaped recording material 1 held therein, and the force in the direction of arrow g when fed out by the platen roller 3, the recording material 1 is moved in the conveying direction. A tension force parallel to (perpendicular to the longitudinal direction of the platen roller 3) is generated. In this state, the recording material 1 is transported with tension applied to it without being skewed because no force is generated in a direction different from the transport direction.

Next, when the recording material 1 is fed obliquely to the conveyance direction, as shown by the solid line in FIG. A force is applied in the direction of the arrow, and as a reaction, a force is applied to the roll end i of the recording material 1 in the direction of the arrow j, which is parallel to the other end 1a of the recording material. At this time, the direction in which each force is applied and j
are not parallel, a torque is generated on the recording material 1 in one direction as indicated by the arrow, and since the roll end i is held by the recording material holder 2, as a result, the recording material 1 Center it and move diagonally in the direction of the arrow.

In the above case, if the pressure contact force between the platen roller 3 and the recording head 8 is large, the recording material 1 will be difficult to travel skewed, but in the present invention, the pressure contact force between the two is reduced during setting, so that recording is possible. Even if the material 1 is fed diagonally, the skew is corrected during the setting operation.

<Example> In the above-described example, the pressing force at the time of setting is reduced by operating the pressing release lever 13, but in addition, as shown in FIG. A dog-shaped hook that is rotatable about the shaft 18 is engaged with a portion 19, and if the hook is constructed so that the portion 19 is linked to the opening and closing of the cover 21 via a link 20, the cover 2
When the coil spring 1 is opened, the length of the coil spring 12 is automatically shortened as shown in FIG. 5, and the pressing force between the platen roller 3 and the recording head 8 can be reduced.

Furthermore, in the above embodiment, the recording material 1 is wound into a roll, but even in the case of a sheet-shaped recording material that is cut one by one, the A similar effect can be obtained by configuring the device to perform positioning.

<Effects of the Invention> As described above, in setting the sheet material, the present invention reduces the pressing force applied to the sheet material than when recording, so even if the sheet material is fed diagonally during setting, it will be normal when setting is completed. It will be automatically corrected to the position. Therefore, when the present invention is used in a facsimile machine, a printer, etc., the operator can easily set the sheet material, and the sheet material will not be printed diagonally during recording, making jams less likely to occur. It has the following characteristics.

[Brief explanation of drawings]

1 to 5 are explanatory diagrams of one embodiment of the present invention, and FIG. 6 is an explanatory diagram of a conventional technique. 1 is a recording material, 2 is a recording material holder, 3 is a platen roller, 5 is an ejection roller, 7 is an ejection tray, 8 is a recording head,
11 is a pressing lever, 12 is a coil spring, 13 is a pressing release lever, 15 is an eccentric cam, 17 is a micro-sinch, 19 is a hook portion, and 20 is a link.

Claims (1)

[Claims] When setting a sheet material in a recording device that conveys the sheet material and presses it with a predetermined force to record, the pressing force applied to the sheet material when conveying and setting the sheet material to the recording position is greater than the predetermined pressing force applied during recording. A method of setting sheet materials characterized by a smaller size.