KR19980074439A - Paper feeder of printer - Google Patents

Abstract

The present invention relates to a paper feeder of a printer for picking up and feeding paper to be printed.

The paper feed apparatus according to the present invention includes a tray on which printing paper is loaded, tray driving means for reciprocating the tray for a predetermined period, and picking up paper by contacting the paper at the rear of the paper leading edge according to the reciprocating motion of the tray. It comprises a roller for feeding, and roller driving means for controlling the paper feed while rotating the roller forward and backward. And the front end portion of the tray is disclosed by forming an inclined downward downward to facilitate the roller in contact with the paper in the rear portion rather than the front end portion of the paper.

Description

Paper feeder of printer

1 is a cross-sectional view of a conventional overall paper feeder.

2 is a view showing the operation of picking up and feeding conventional paper,

(A) is sectional view showing the principle of feeding operation.

(B) is sectional drawing which shows the principle of pick-up operation.

3 shows a conventional paper feeding operation in order,

(A) is sectional drawing of initial state.

(B) is sectional drawing at the time of raising a tray for pickup.

(C) is sectional drawing at the time of pickup.

(D) is a sectional view at the time of feeding.

4 is a sectional view of a paper feed apparatus according to the present invention.

5 is a cross-sectional view showing a contact state between a paper feed roller and a sheet according to the present invention.

6 is a view showing the operation during pickup and feeding according to the present invention,

(A) is a cross-sectional view showing the principle of the tray lowering operation after feeding.

(B) is a cross-sectional view showing the principle of the feeding operation.

7 shows the paper feeding operation according to the present invention in order,

(A) is sectional drawing of initial state.

(B) is sectional drawing at the time of raising a tray for pickup.

(C) is sectional drawing at the time of pickup.

(D) is a sectional view at the time of feeding.

8 is a cross-sectional view showing the paper state of the pickup moment.

* Description of the symbols for the main parts of the drawings *

1, 101: Feed roller 3, 103: Tray

4, 104: paper 7, 107: pinion

10, 110: Feed gear 11: One-way clutch

12, 112: arm 15, 115: cam gear

16, 116: Cam

The present invention relates to a paper feeder of a printing press, and more particularly to a paper feeder of a printing press configured to make the contact point between the feed roller and the paper behind the front end of the paper, so that picking up and feeding of the paper is made easier. It is about.

First, the conventional paper feeding apparatus will be described with reference to FIG. The conventional paper feeding apparatus includes a paper feed roller 1 and a tray 3 on which paper 4 to be fed by rotation of the paper feed roller 1 is stacked. The paper feed roller 1 is configured to be rotated in one direction by the paper feed gear 10. In the forward rotation of the feed gear 10, the feed roller 1 rotates together with the feed gear 10, and in the reverse rotation of the feed gear 10, even if the feed gear 10 rotates, the feed roller 1 Is not to rotate. That is, the paper feed roller 1 and the paper feed gear 10 are connected by the one-way clutch 11 so that the paper feed gear 10 can rotate the paper feed roller 1 together only in the forward direction. Consists of.

Next, the power transmission relationship for rotating the feed gear 10 will be described. The pinion 7 which is rotated by a drive motor (not shown) is configured to transmit power to the feed gear 10 via the first idle gear 8 and the second idle gear 9. An arm 13 is rotatably connected to the shaft center of the second idler gear 9, and a toggle gear 13 is connected to the other end of the arm 13. The toggle gear 13 interrupts the transmission of power from the second idle gear 9 to the cam idle gear 14 described later.

The cam idle gear 14 is engaged with the cam gear 15, and the cam gear 15 is attached with a cam 16 which can rotate together. The cam 16 is operated to bring the tray 3, which is loaded with paper, into close contact with the paper feed roller 1 side.

And the tray 3, which is loaded with a plurality of sheets is rotated about one side end (3a), while the front end portion of the paper to be supplied is rotated by the feed roller (1) side by the elastic member (6) The cam 16 supports the tray in a direction in which the tray 3 is spaced apart from the paper feed roller 1.

Next, the process of picking up and feeding the paper will be described with reference to FIG. FIG. 2B shows the operational relationship at the moment of picking up the paper by the above-described mechanism. When the pinion 7 driven by the drive motor rotates in the forward direction, that is, in the clockwise direction, the first idler gear 8 engaged thereto rotates counterclockwise, and the second idler gear 9 rotates clockwise. do. As the second idler gear 9 rotates clockwise, the arm 12 also rotates clockwise about the axis of the second idler gear 9. When the arm 12 rotates clockwise, the toggle gear 13 at its end also engages with the cam idle gear 14 while rotating clockwise as well. At this time, the toggle gear 13 transmits the power of the second idle gear 9 to the cam idle gear 14, and thus the cam idle gear 14 also rotates clockwise.

The clockwise rotation of the cam idle gear 14 causes the cam gear 15 engaged therewith to rotate counterclockwise, so that the cam 16 also rotates counterclockwise. Counterclockwise rotation of the cam 16 pushes the paper tray 3 toward the paper feed roller 1, and the paper 4 comes into contact with the paper feed roller.

The feed gear 10 engaged with the second idler gear 9 rotates counterclockwise, but the feed gear 10 and the feed roller 1 are mutually rotated by the one-way clutch 11. Since it is in a disassembled state, the paper feed roller 1 is in a non-rotating state.

As shown in FIG. 2A, which shows the feeding state of the paper 4, the pinion 7 is rotated counterclockwise when feeding the paper. Then, the second idler gear 9 also rotates counterclockwise through the first idler gear 8, and the feed gear 10 meshed with the second idler gear 9 rotates clockwise. By the clockwise rotation of the feed gear 10, the one-way clutch 11 brings the feed gear 10 and the feed roller 1 into a fastened state so that they can rotate together. The counterclockwise rotation of the second idler gear 9 causes the arm 12 to rotate counterclockwise, so that the toggle gear 13 and the cam idle gear 14 are spaced apart, so that the paper tray 3 ) Is spaced apart from the paper feed roller 1, and only one sheet of paper picked up by the pick-up process is transferred to the inside of the printing machine to be printed.

Next, the process from the initial state to the feeding state will be described sequentially based on FIG. 3.

3A is an initial state in which no printing is performed. In this state, the sheet of the paper feed tray 3 is in a state spaced apart from the paper feed roller 1. In this state, one sheet of paper must be picked up in order to supply the sheet of paper 4 to the inside of the printing machine.

See FIG. 3 (b). A preparation process for pickup, that is, a process in which the paper tray 3 is in close contact with the paper feed roller 1, is performed as shown in Fig. 2B. That is, the cam 16 rotates by the clockwise rotation of the pinion 7, and the elastic member 6 is pushed upward from the lower surface of the paper tray 3, so that the first sheet inside the paper tray 3 is rotated. The leading edge of the paper is brought into contact with the paper feed roller 1. At this time, the paper feed gear 10 is rotated in the counterclockwise direction by the clockwise rotation of the pinion (7), but because the engagement state with the paper feed roller 1 by the one-way clutch 11 is released The roller 1 does not rotate. If the paper feed roller 1 is rotated in this state, since the paper feed roller 1 is rotated counterclockwise, the paper feed roller 1 is rotated in the opposite direction to the paper feeding direction, and the paper will be pushed backward.

And (c) shows the pickup state of the paper, the pinion (7) is rotated in the counterclockwise direction to pick up the first sheet of paper (4), to be conveyed by the paper feed roller 1 to some extent. Then, as shown in (d) again, the pinion 7 rotates clockwise to separate the paper tray 3 from the paper feed roller 1 by the cam 16. After the paper tray 3 is separated from the paper feed roller 1, the pinion 7 again rotates counterclockwise so that the picked-up paper is fed by the paper feed roller 1.

As described above, when contacting the tray feed roller 1 side in order to pick up the first sheet of paper in the initial state, the leading end of the paper comes into contact with the feed roller 1, and the paper having the front end contacted with the paper feed roller One way clutch must be used to control the rotational direction of the feed roller until it is picked up by (1) and fed. If the one-way clutch is not used, the paper feed roller 1 rotates counterclockwise when the paper tray is lifted for pickup, and the paper to be picked up is fed backward and the first sheet cannot be picked up. The disadvantage is that multiple sheets are fed simultaneously because the second or third sheet is picked up. And it can be seen that the direction control of the paper feed roller by the use of such a clutch increases the number of components, thereby complicating the assembly process, thereby increasing the productivity.

The present invention has been made to solve such a problem, and an object thereof is to provide a paper pick-up and feeding device of a simpler configuration.

A paper feed apparatus according to the present invention for achieving the above object includes a tray on which printing paper is loaded, a tray driving means for reciprocating the tray for a predetermined period, and a sheet of paper at the rear of the paper tip according to the reciprocating motion of the tray. And a roller for picking up and feeding the paper in contact with the roller, and roller driving means for controlling the paper feed while forward and reversely rotating the roller.

The tip of the tray is inclined downward to make it easier for the paper feed roller 10 to come in contact with the rear portion of the tip of the paper.

Next, the present invention will be described in more detail with reference to the illustrated embodiments.

As shown in FIG. 4, according to the present invention, the configuration of the conventional one-way clutch is omitted, the feed gear 110 and the feed roller 101 are configured to interlock in the same direction, and the feed roller 101 It is characterized in that the contact with the paper from the rear end of the paper 104.

The paper feed gear 110 is directly connected to the paper feed roller 101 so that the paper feed roller 101 also rotates forward and backward in the same direction by the rotation of the paper feed gear 110. In addition, when looking at the power transmission relationship to the feed gear 110, the pinion 107 capable of forward and reverse rotation by a drive motor (not shown) is powered through the first idler gear 108 and the second idler gear 109. Will be delivered. The second idler gear 109 is engaged with the feed gear 110, so that the rotation of the second idler gear 109 rotates the feed gear 110.

The arm 112 is connected to the rotation shaft of the second idler gear 109 so that the arm 112 rotates together, and the toggle gear 113 is rotatably supported at the other end of the arm 112. The toggle gear 113 is engaged with the second idle gear 109 so that the rotational force of the second idle gear 109 can be transmitted to the cam idle gear 114.

In the initial state, the cam idle gear 114, which is separated from the toggle gear 113, is engaged with the cam gear 115, and the cam gear 115 is rotatable like the cam 116. The cam 116 supports the paper tray 103 downward in the initial state shown, and when the cam 116 rotates, the paper tray 103 is pushed upward by the elastic member 106. .

The paper tray 103 according to the present invention has a plurality of sheets of paper 104 loaded thereon, and as described above, the paper feed roller 101 is in contact with the paper 104 at a position slightly rearward rather than the leading end of the paper. I can do it. 5 clearly shows the contact point P between the paper feed roller 101 and the paper 104. As shown in FIG. In addition, the front end of the paper tray 103 is provided with a downwardly inclined portion 103a formed to be inclined downward, so that the paper 104 is disposed at a contact point P positioned substantially rearward from the front end of the paper 104. The paper feed roller 101 is in contact with the feed roller. Of course, the position of the contact point P is not determined by the downwardly inclined portion 103a. However, by forming the downwardly inclined portion 103a, the paper feed roller 101 does not come into contact with the leading edge of the paper. The contact with the first sheet of paper 104 in the rear position can be made easier.

An elastic member 106 elastically supports the tray 103 upwardly under the paper tray 103.

Next, referring to Fig. 6, the pick-up and feeding operation of the paper of the apparatus according to the present invention will be described.

6A illustrates a power transmission process for bringing the paper tray 103 into contact with the paper feed roller 101 to pick up the paper. As shown, when the pinion 107 rotates in the clockwise direction, the rotational force passes through the first idler gear 108 and the second idler gear 109, and the arm cooperates with the rotation axis of the second idler gear 109. Rotate (112) clockwise. Then, the toggle gear 113 supported at the other end of the arm 112 is engaged with the cam idle gear 114, thereby transmitting the rotational force of the second idle gear 109 to the cam idle gear 114. The cam idle gear 114 rotates the cam gear 115 and the cam 116 linked with the cam gear 115 also rotates counterclockwise.

The elastic force of the spring 106 causes the paper tray 103 to move upward by the rotation of the cam 116, and the paper 104 comes into contact with the paper feed roller 101. At this time, as shown in FIG. 5, the contact point P is not located at the front end of the paper 104 but at the rear part of the front end.

In addition, the clockwise rotation of the pinion 107 is transmitted to the feed gear 110 via the first idle gear 108 and the second idle gear 109, and the feed gear 110 is shown in FIG. As shown in a), it rotates counterclockwise. At this time, since the contact point between the paper feed roller 101 and the paper 104 is located at the rear end of the paper, the paper feed roller 101 is always in contact with the first sheet even by the counterclockwise rotation of the paper feed roller 101. It is in a state of being. When the paper tray 103 comes into contact with the paper feed roller 101 by the clockwise rotation of the pinion 107, the rotation of the pinion 107 is stopped.

6A shows the tray lowering operation after the paper 104 is picked up, and the counterclockwise rotation of the pinion 107 causes the first idler gear 108 and the second idler gear 109 to rotate. After passing through the clockwise rotation of the feed gear 110, the feed gear 110 is rotated in the clockwise direction to feed the paper. At this time, the arm 112 that interlocks with the second idler gear 109 rotates counterclockwise like the second idler gear 109 to space the toggle gear 114 and the cam idle gear 114. At this time, the counterclockwise rotation of the arm 112 is caught by the stopper 105 so that it cannot proceed any further, thereby preventing contact with the paper feed roller 101.

Next, the paper feeding operation of the paper feeding device according to the present invention will be described sequentially with reference to FIG. 7.

(A) shows an initial state in which paper is not fed. In such a state, the clockwise rotational force of the pinion 107 is transmitted through the first idler gear 108 and the second idler gear 109 to rotate the arm 112 clockwise, so that the toggle gear 113 is rotated. And cam idle gear 114 are engaged. Accordingly, the cam idle gear 114 rotates the cam gear 115 and the cam 16 rotates accordingly, so that the tray 103 moves upward by the elastic member 106 so that the paper 104 is fed. It comes in contact with the roller 101, and it will be in the state as shown to (b). The position of the contact point between the paper feed roller 101 and the paper 104 is as described above.

In this case, the clockwise rotation of the pinion 107 rotates the feed gear 110 counterclockwise, so that the paper 104 is pushed back slightly by the counterclockwise rotation of the feed gear 110. Since the contact point between the paper feed roller 101 and the paper 104 is located at a position away from the front end, the first sheet of paper and the paper feed roller 101 are still engaged.

As such, when the tray 103 is raised and engaged with the paper feed roller 101, the clockwise rotation of the pinion 107 is stopped, and the counterclockwise rotation starts. As shown in (c), the paper feed roller 101 rotates clockwise by the counterclockwise rotation of the pinion 107, and the paper feed roller 101 rotates clockwise to form the interlocking paper ( The first chapter of 104) is picked up. At this time, the arm 112 is rotated in the counterclockwise direction as the counterclockwise rotation of the second idler gear, the toggle gear 113 and the cam idle gear 114 is spaced apart. When the first sheet is conveyed to some extent, the pinion 107 again rotates clockwise to move the paper tray 103 downward.

When the pinion 107 rotates clockwise again, as shown in (d), the rotational force is transmitted to the first idler gear 108 and the second idler gear 109, and the second idler gear 109 The toggle gear 113 and the cam idle gear 114 come into contact again while the interlocking arm 112 also rotates clockwise. Accordingly, the cam is rotated through the cam gear 115 to move the tray 103 downward, so as to be spaced apart from the paper feed roller 101.

After the tray 103 is spaced apart from the paper feed roller 101, the pinion 107 again rotates counterclockwise to feed the first sheet of paper bited by the paper feed roller 101. In this way, the feeding of the first sheet is continued, and when the predetermined printing operation is completed, the above-described operations (b) to (d) are repeated, and continuous paper feeding is performed.

According to the present invention configured as described above, the following advantages are expected. First, since the paper feeder driven by one drive source and the paper feed roller are configured to directly interlock, a power transmission / blocking device as in the prior art is not required. Therefore, there is an advantage that the number of components becomes small and the assembly process is simplified. This advantage will be able to lower the production cost, resulting in improved productivity due to improved assembly.

Since the paper feed roller can be directly rotated forward and reverse by the driving source, and a paper jam occurs on the paper feed path, a mechanism can be automatically removed by rotating the paper feed roller in reverse. The effect that can provide is expected.

Claims (3)

A tray on which printing paper is loaded; Tray driving means for reciprocating the tray for a predetermined period; A roller which picks up and feeds the paper by contacting the paper at the rear of the paper tip according to the reciprocating motion of the tray; And And roller driving means for controlling the paper feed while rotating the roller forward and backward. The paper feed apparatus according to claim 1, wherein the leading end of the tray is formed to be inclined downward. The paper feed apparatus according to claim 1 or 2, wherein the tray driving means and the roller driving means operate with the same driving source.