JPS63222873A - Paper feeding mechanism for cut sheet feeder - Google Patents

Abstract

PURPOSE:To enable printing on both sides of a paper, by discharging the paper printed on the front side thereof from a platen, and then automatically re-supplying the paper to the platen in the state of being inverted front side back. CONSTITUTION:In the case of perfect printing, printing on the front side of a paper is carried out, paper feeding is stopped by stopping a platen 1 when the paper reaches a second ejection roller 27, and a driving means 28 is operated to position a guide member 23 to a first position A. With the platen 1 reversely rotated automatically or manually in this condition, first and second ejection rollers 26, 27 are also reversely rotated, whereby the paper is fed between the platen 1 and a pinch roller 24 while being guided by the guide member 23. When the leading end of the paper reaches the pinch roller 24, the platen 1 is started rotating forward, whereby the paper is taken into be positioned in a state for starting printing. In this condition, the driving means 28 is operated to position the guide member 23 to a second position B, and printing on the back side of the paper is started.

Description

[Detailed Description of the Invention] [Summary] The purpose of the present invention is to enable printing on both sides of paper when printing with a printer device using a cut sheet feeder. This purpose is achieved by automatically supplying printed paper to the platen again in a reversed state after being ejected from the platen.

[Industrial application field]

The present invention relates to a cut sheet feeder used for printing cut sheets (hereinafter referred to as paper) in a printer device, and particularly to a paper feeding mechanism that enables printing on both sides of the paper.

The cut sheet feeder includes a paper feed unit that stores paper and feeds the paper sequentially toward a platen, and an ejection roller that is driven by the same drive source as the platen and ejects the paper fed out from the platen. It is installed and used.

[Conventional technology]

FIG. 4 is a schematic diagram of a printer device using this type of conventional cut sheet feeder, and in the figure, 1 is a platen and 2 is a cut sheet feeder. Cut sheet feeder 2
is the ejection roller 3 and the hopper (paper storage section)
The rotation of the platen 1 is controlled by the pickup roller 5.4, a pickup roller 5, a sub-vic roller 6, and a clutch 7. It is equipped with a transmission system such as a gear group (the gear group is not shown) for transmitting information to the sub-bic roller 6, and is used by being attached to a printer device including the platen 1. Hopper 4
is the pressure plate 8 and the pressure plate 8.
It is provided with a spring 9 that biases upward as indicated by an arrow. The printing procedure using this printer device is as follows.

The sheets 100 are set in a stacked state on the pressure plate 8 and are pressed against the sub-bic roller 6 by the urging force of the spring 9. When starting printing, the clutch 7 is turned on and the platen 1 is rotated clockwise.

As a result, the big up roller 5. which is driven by the platen 1 via the transmission system. The sub-pin roller 6 also rotates in the same direction, and the first sheet of paper 100 is fed out by the pink-up roller 5, but the sub-big roller 6 plays a role of assisting this feeding. Furthermore, a separator 10 provided in the cut sheet feeder opposite to the pickup roller 5 plays a role in preventing double feeding.

The fed paper 100 is sent to the outer periphery of the platen 1 through a conveyance path 11 whose length is set to be equal to or less than the paper length, and is subsequently transported by the platen 1 and positioned in a printing starting state. In this process, the clutch 7 is turned off and the pickup roller stops when the sheet feeding is completed, which is detected by the sensor detecting the leading edge of the sheet, and thereafter the sheet is fed by rotation of the platen 1. The feed roller 14 assists in transporting the paper to the printing start state, and reduces the load on the platen 1 (when the pickup roller 5 stops and the paper is fed by the platen 1, the pickup roller 5 is still in pressure contact with the paper). (In such a case, the load on the platen 1 would be large). Printing on the paper thus positioned in the printing start state is performed by the print head 12 facing the platen 1, and line breaks are performed by rotation of the platen 1. After completing predetermined printing, the paper is ejected into the stacker 13 by the platen 1 and ejection roller 3.

[Problem that the invention seeks to solve]

Conventional printers with this configuration 2 function cannot print on both sides of the paper, so the operator takes out the paper that has been printed on, sets it face down again, and prints on the back side, thereby printing on both sides. It was very troublesome.

[Means for solving problems]

The present invention provides a paper feeding mechanism for a cut sheet feeder that can solve the above-mentioned problems, and the principle thereof is shown in FIG.

In FIG. 1, 1 is a platen, and 22 is an eject member provided on a cut sheet feeder.

The ejection member 22 is composed of a first ejection roller 26 close to the platen 1 and a second ejection roller 27 far from the platen 1, and each of these ejection rollers 26 and 27 is driven by the same drive as the platen 1. powered by a source.

A guide member 2 is provided between the ejection rollers 26 and 27.
3 is provided.

The guide member 23 is positioned at a first position A and a second position B by being driven by a driving means 28 that operates at a predetermined time.

24 and 25 are pinch rollers and sensors that are added for reference.

[Effect]

platen 1 from a paper feed unit (not shown). Printing on the paper fed between the pinch rollers 24 is performed by a print head (not shown) facing the platen 1, and the paper discharged after printing is sent to the eject member 22 by the platen.

In the case of one-sided printing, the guide member 23 is positioned at the second position WH, and the guide member 23 guides the paper sent by the first ejection roller 26 to the second ejection roller 27. Therefore, the paper is continuously fed by the second ejection roller 27 and ejected to a stacker (not shown).

When printing on both sides, first print on the front side in the same manner as described above. Then, the paper is transferred to the second ejection roller 2.
7, the platen 1 is stopped to stop paper feeding, and the driving means 28 is activated to position the guide member 23 at the first position A. If the platen 1 is reversed in this state, the first. The second ejection rollers 26 and 27 also rotate in reverse, and the paper is guided by the guide member 23 and sent between the platen 1 and the pinch roller 24.

In this case, the operation timing of the driving means 28 is set by, for example, detecting the trailing edge of the sheet by the sensor 25.

When feeding the paper to the platen 1 in this way, the first ejection roller 26 is moved to the second ejection roller 2.
Since it is located closer to the platen than 7, it does not interfere with paper feeding. When the paper fed toward the platen 1 in this manner hits the pinch roller 24, the platen 1 begins to rotate normally, sucks in the paper, and positions it in a printing starting state. In this state, the guide member 23 is positioned at the second position B by the driving means 28, and printing on the back side of the paper is started. The paper that has been printed is placed in the first page. Second ejection roller 26
．． 27 to the stacker.

〔Example〕

The present invention will now be described in detail with reference to FIGS. 2 and 3.

FIG. 2 is a schematic diagram showing a paper feeding mechanism of a cut sheet feeder according to the present invention, in which 21 is a cut sheet feeder, 22 and 23 are eject members and guide members provided on the cut sheet feeder 21, and 24 is a pinch plate. The roller 25 is a sensor. Incidentally, members having the same structure and function as those in the prior art are given the same reference numerals as in the prior art.

The eject member 22 includes a first ejection roller 26 close to the platen 1 and a second ejection roller 27 far from the platen 1. Each of these ejection rollers 26 and 27 is driven by the same drive source as the platen 1 and rotates in the same direction as the platen 1.

The guide member 23 is positioned at a first position A and a second position B by being driven by a driving means 28 such as a magnet that operates at a predetermined time.

The present invention is configured as described above, and its operation will be explained next.

In the case of normal front side printing, the guide member 23 is positioned at the second position B. In this state, the paper 100 is set in the hopper 4, the clutch 7 is turned on, and the platen 1
When the paper 100 is rotated clockwise (forward rotation), the paper 100 is fed out by the pick-up roller 5 and caught between the platen 1 and the pinch roller 24. When the leading edge of the paper 100 reaches the pinch roller 24, the presence of the paper is detected by the sensor 25, and the clutch 7 is turned off. In this state,
The paper has come off the pickup roller 5, and then the paper is positioned by the platen 1 to a state where printing starts.

In this state, printing is performed by the print head 12, and necessary line breaks are performed by the platen 1. After printing, the sheet of paper is sent in the direction of the arrow by the platen 1, and is sent to the first . It is subsequently fed by the second ejection rollers 26, 27 and ejected into the stacker 29. During this paper feeding, the guide member 23 moves from the first ejection roller 26 to the second ejection roller 26.
The paper is guided to the ejection roller 27.

When printing on both sides, first print on the front side in the same manner as described above. Then, the paper is transferred to the second ejection roller 2.
7, the platen 1 is stopped to stop paper feeding, and the driving means 28 is activated to position the guide member 23 at the first position A. In this case, the timing of stopping the platen 1 and operating the driving means 28 is set by detecting the trailing edge of the paper by the sensor 25. Specifically, for example, the platen 1 is stopped after a predetermined period of time has elapsed since the trailing edge of the paper was detected by the sensor 25. Then, the guide member 23 is moved. If the platen 1 is reversed automatically or manually in this state, the first. Second ejection roller 26.2
7 is also reversed, and the paper is guided by the guide member 23 and sent between the platen 1 and the pinch roller 24. When feeding the paper to the platen 1 in this way, the first ejection roller 26 is located closer to the platen 1 than the second ejection roller 27, so it does not interfere with paper feeding.

When the leading edge of the paper being sent toward the platen 1 in this manner reaches the pinch roller 24, the platen 1 starts normal rotation, sucks in the paper, and positions the paper in a printing starting state. In this state, the guide member 23 is positioned at the second position B by the driving means 28, and printing on the back side of the paper is started. The paper that has been printed is placed in the first page. Second ejection roller 26
．． 27 and is discharged to the stuff force 29.

Note that in the case of this back side printing, the front and back of the paper and the left and right sides are reversed, so data conversion is required on the host side.

There is a limit to the length of paper on which such double-sided printing can be performed. That is, when the leading edge of the paper reaches the pinch roller 24 to reverse the platen 1, etc., the trailing edge of the paper must pass the second ejection roller 27. The length is subject to limitations.

FIG. 3 shows the operation timing of each member (the motor serving as a driving source for the platen 1, etc., the clutch 7, and the magnet serving as a driving means) in the above-described printing process. FIG. 3(a) shows the case of printing only on the front side, and FIG. 3(b) shows the case of printing on both sides.

In the case of FIG. 3(a), the magnet remains off, the guide member 23 is positioned at the second position, and the motor rotates forward until the leading edge of the paper reaches the stop position and the paper is positioned to start printing. do. The clutch 7 is turned on when the motor starts normal rotation (when the paper feed starts), and is turned off when the leading edge of the paper is detected by the sensor 25. After that, printing proceeds with line feeds.

In the case of FIG. 3(b), the clutch 7 remains off, and the paper on which printing has been completed is ejected toward the eject member by normal rotation of the motor. Then, when a predetermined period of time has elapsed since the trailing edge of the paper was detected by the sensor 25, the magnet is turned on and the guide member 23 is positioned at the first position A.
The motor begins to reverse. Then, when the leading edge of the paper sent toward the platen 1 by the second ejection roller reaches the pinch roller 24, the motor starts normal rotation and the paper is sucked in. Then, after a predetermined time has elapsed, the magnet is turned off and the guide member 23 is positioned at position B. In this state, printing on the back side starts, and the paper after printing is placed in the first page. Second ejection roller 2
6.27, it is discharged to the stacker.

〔Effect of the invention〕

As described above, according to the present invention, there is no need to take out the paper and re-centre it when printing on the back side, and the operation can be facilitated.

[Brief explanation of the drawing]

Fig. 1 is a diagram of the principle of the present invention, Fig. 2 is a schematic diagram showing the paper feeding mechanism of a cut sheet feeder according to an embodiment of the invention, Fig. 3 is a time chart showing the operation timing of each member, and Fig. 4 is This is a schematic diagram of a printer device using a conventional cut sheet feeder, in which 1 is a platen, 21 is a cut sheet feeder, 22 is an eject member, 23 is a guide member, 24 is a pinch roller, 25 is a sensor, and 26 is a third 1 is an ejection roller, 27 is a second ejection roller, 28 is a driving means, 100 is paper (cut sheet), A is a first position, and B is a second position. 21 cut sheet feeder complete diagram Figure 1

Claims (1)

[Scope of Claims] A cut sheet feeder comprising an eject member (22) driven by the same drive source as the platen (1) and ejecting the paper sent out by the platen (1) after printing, the eject member (22), a first ejection roller (26) near the platen (1), and a second ejection roller (27) far from the platen (1).
), and is driven by a driving means (28) that operates at a predetermined time between the first and second ejection rollers (26) and (27), so that the first ejection roller ( 26), a first position (A) for guiding the paper passed through the platen (1), and a second position (B) for guiding the paper towards the second ejection roller (27). A paper feeding mechanism for a cut sheet feeder, characterized in that a guide member (23) is provided which is positioned at each of the sides.