KR102120492B1 - Paper feeder for Middle speed printing - Google Patents

Abstract

The present invention relates to a sheet paper feeder and, more specifically, to a sheet paper feeder, which recognizes sheet paper lifted and lowered using a pressure sensor to stably supply paper. The present invention provides the sheet paper feeder, comprising: a sensing plate (70) connected to a feeding shaft (36) and coming in contact with the lifted and lowered paper; a deformation amplification member (64) attached to a sensor fixation member (42) coupled to a fixation bar (20) of a frame (11) and provided with a hole (65) for deformation amplification; a pressure sensor (60) attached to one side surface of the deformation amplification member (64); a spring (62) positioned between the deformation amplification member (64) and the sensing plate (70); and a guide shaft (61) guiding a position of the spring (62) and moving up and down while coming in contact with the sensing plate (70). The present invention provides the sheet paper feeder using the pressure sensor, which can control a frictional force between a feeding roller and paper within a setting value range such that paper lifting and lowering control and paper feeding control can be continuously performed, and the sheet paper can be stably fed according to what the paper is made of, how big the paper is, whether the paper is coated and whether the paper is printed as compared with a prior method.

Description

Paper feeder for Middle speed printing}

The present invention relates to a sheet paper feeder, and more particularly, to a sheet paper feeder characterized by recognizing the sheet being lifted using a pressure sensor and stably supplying the sheet paper to a high-speed printer or printer.

In general, the method of supplying paper to a printer or digital printing machine is classified into a method of supplying continuous paper or supplying a separate sheet of paper.

The paper feeder for supplying the cut sheet is divided into low speed (30 sheets or less), medium speed (100 sheets or less), and high speed (100 sheets or more) according to the number of sheets supplied per minute.

The low-speed sheet feeder is a technology applied to a printer used in a home or a company, and is a method of supplying paper with a friction force between the sheet paper and a feed roller. In the case of a high-speed printer, a lift member and a vacuum fan (fan that floats the paper) ) Is used a lot.

Since the air feeding method applied to the high-speed printer is equipped with a blower and a vacuum device, the sale price forms a high price range of tens of millions of won, so it is difficult to apply to a low-cost printer and printer.

The medium to high speed paper supply apparatus includes an apparatus for elevating the stacked paper as the sheet paper is supplied at a high speed.

Control of the lifting device is very important in accordance with the speed at which the cut sheet is supplied to the high-speed printer, and the driving time of the lifting device is a key technology whether or not the paper is recognized.

FIG. 2 compares the concept of sensing whether the paper is elevated using a conventional photo sensor and the conceptual diagram of sensing whether the paper is elevated using a pressure sensor of the present invention.

The method of recognizing the position of the paper using the existing photosensor has the advantage of being able to be manufactured inexpensively due to its simple structure, whereas in the case of the printing thickness and the thickness of the paper, a paper feeding error frequently occurs.

In order to smoothly feed various types of paper at high speed, it is possible to control the friction between the paper and the feeding rollers. However, only the on-off signal is transmitted by the photosensor, and a constant frictional force cannot be achieved and the range of the frictional force cannot be set.

In addition, in the method of recognizing the position of the paper using the photosensor, the flatness of the paper is not constant for the paper that has not been printed, so there is no extreme misfeeding except for double feeding, but in the case of printing paper, ink is deposited and dried during the printing process. The wrinkles of the paper inevitably occur through the process. Therefore, in case of elevating the printing paper with fine wrinkles, the conventional photo sensor paper feeder caused a lot of misfeeds.

Accordingly, there is a need for a technology for a paper feeder that can be applied to a medium-speed or higher-speed printer, and recognizes a single sheet of paper while stably supplying a sheet to a printer or printer while responding to changes in printing paper and paper thickness.

1. KR 20-1999-0017996,'Automatic paper feeder for office automation equipment', published date: 1999.06.05. 2. KR 20-2016-0003723,'Paper supply device', published date: 2016.10.28.

The present invention was devised to solve the above problems, in a feeder for supplying a sheet of paper to a high-speed printer with a medium speed or higher, the photo sensor (66) pressure sensor (60) to the distance to grasp the position of the sheet being lifted It is an object of the present invention to disclose a sheet paper feeder characterized by replacing with a measurement sensor.

In order to achieve the above object, the present invention includes a frame 11 including a cover 10; The frame 11 is provided with a lifting motor 21 attached to one side of the frame, a rotating screw 23 connected to the lifting motor 21, and a lifting plate 24 connected to the rotating screw to move up and down. A lifting assembly 20; A rotating motor 31 attached to one side of the frame 11; A conveying assembly 30 having a conveying roller 35 and a feeding roller 37 connected via the rotary motor 31, the pulley 33, and the shafts 34, 36; A paper width adjusting member 40 connected to the fixing bar 20 of the frame 11 to guide the width of the paper; In the sheet feeder comprising a paper connected to the feeding shaft 36 and lifted A sensing plate 70 in contact with; A deformation amplifying member 64 attached to the sensor fixing member 42 fastened to the fixing bar 20 of the frame 11 and having a hole 65 for deformation amplification; A pressure sensor 60 attached to the deformation amplifying member 64 and one side portion; A spring 62 positioned between the deformation amplifying member 64 and the sensing plate 70; To guide the position of the spring 62, the guide shaft 61, which moves up and down while in contact with the sensing plate 70; is intended to disclose a cut sheet feeder comprising a.

In addition, the present invention in the sheet feeder, connected to the feeding shaft 36, the sensing plate 70 in contact with the lifting paper; A pressure sensor 60 attached to a sensor fixing member 42 engaged with a fixing bar 20 of the frame 11; A spring 62 positioned between the pressure sensor 60 and the sensing plate 70; To guide the position of the spring 62, the guide shaft 61, which moves up and down while in contact with the sensing plate 70; is intended to disclose a cut sheet feeder comprising a.

In addition, the present invention in the sheet feeder, connected to the feeding shaft 36, the sensing plate 70 in contact with the lifting paper; It is intended to disclose a sheet paper feeder comprising a; distance measurement sensor attached to the sensor fixing member 42 fastened to the fixing bar 20 of the frame (11).

Finally, the present invention is a blower for preventing static electricity removal and double feeding between papers, a fan 51 fastened to one side of the paper width adjusting member 40; It is connected to the fan (51) and intends to disclose a sheet paper feeder comprising a duct (52) having a blower port (53) for blowing air to the top of the paper.

Due to the above solution, the present invention has the following effects.

First, since the sheet feeder using a pressure sensor can control the friction force between the feeding roller and the paper within a set value range, it is possible to control the sheet paper up and down and feed at a high speed of 120 sheets per minute as well as medium speed.

Second, compared to the conventional method, it is possible to stably cut sheet paper regardless of the material, size, coating and printing.

1 is a configuration diagram of an embodiment of a digital printing machine.
2 is a sensing perspective view (A) using a pressure sensor and a sensing perspective view (B) using a photosensor.
3 is a perspective view (A), a side view (B) and a front view of a preferred embodiment of the present invention.
4 is a front perspective view (A) and a rear perspective view (B) with the cover 10 removed.
5 is a plan view of the state in which the cover 10 is removed.
6 is a front perspective view (A) and a lower perspective view (B) of the transport assembly 30 and the width adjustment assembly.
7 is a state diagram of paper lifting recognition using a pressure sensor.
8 is a front view of the sensing plate 70 and the pressure sensor 60.
9 is a control flow diagram of one preferred embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily practice. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein.

In order to clearly describe the present invention, parts not related to the description (such as electrical circuits and other required parts) are omitted, and the same reference numerals are assigned to the same or similar elements throughout the specification.

In addition, since the size, color, and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to that shown in the drawings. In the drawings, the thickness is enlarged to clearly express various parts and regions. In addition, in the drawings, thicknesses of some parts and regions are exaggerated for convenience of description.

The present invention relates to a sheet paper feeder, and more particularly, to a sheet paper feeder characterized in that the sheet is lifted by using a pressure sensor to stably supply paper.

1 is a configuration diagram of an embodiment of a digital printing machine, and FIG. 2 is a sensing perspective view (A) using a pressure sensor and a sensing perspective view (B) using a photosensor.

As shown in FIG. 1, the sheet paper feeder of the present invention is an apparatus for supplying sheet paper of 30 to 120 sheets per minute or less to a high-speed printer or a high-speed printer.

In order to supply a single sheet to a medium to high speed printer or printer, a lifting assembly for elevating the stacked sheet paper, a sensing unit for sensing the elevated sheet, and a transport assembly for feeding the elevated sheet to the printer or printer.

It is necessary to sequentially feed the sheet of paper into the printer and lift the stacked sheets of paper at the same time. Position control and speed control of the lifting assembly is very important, and the starting point detection for the lifting assembly to operate controls the operation of the lifting assembly. Therefore, it is the core technology of the sheet feeder.

2B is a conceptual diagram for sensing a lift position of a paper using an existing optical sensor. Connected to the feeding shaft 36 and tilted, the sensing roller 72 is in contact with the cut sheet, and the top plate 70 having a pin 74 across the center of the pair of photo sensors 66, and the pin ( 74) is composed of a pair of photo sensors 66 that are arranged symmetrically with respect to the light emitting portion and the light receiving portion.

When the sheet paper is fed to the high-speed printer and the sensing plate 70 is lowered, the signal of the photosensor is turned on and the lifting assembly operates to elevate the stacked sheet paper. Thereafter, when the sensing plate 70 is tilted at a certain angle due to the lifted sheet paper, the pin 74 is placed between the photosensors 66, and the signal of the photosensor 70 is turned off to stop the lifting assembly. And, while repeating the above process, the stacked sheet paper is continuously elevated.

As described above, the method of sensing the paper using the existing photo sensor has a simple structure, and stable lifting and feeding are performed on the unprinted paper.

However, although the signals of the photo sensor are only on and off, the friction force between the feeding roller 37 and the paper cannot be kept constant, and the photo sensor method does not, even though the friction force must be increased in proportion to the thickness of the paper. can not do it. In addition, even when the width of the paper increases, the weight of the entire paper is changed, so the frictional force between the feeding roller 37 and the paper needs to be changed, but the photosensor has poor response ability.

In addition, the printing of the paper also played an important role in feeding the paper. If the paper is laminated to the sheet feeder in the state of fine wrinkles and bending as it goes through the printing process, the misfeeding increases rapidly.

For example, as an example, bills such as national tax or local tax output personal information on paper printed with various municipal advertisements or local tax forms on continuous paper, and then go through the process of enveloping in the form of an envelope. While passing through the process of depositing and drying the ink, fine paper wrinkles and bending occurs. When the printing paper is fed to a single sheet feeder to output personal information to a high-speed printer, misfeeding frequently occurs.

Accordingly, there has been a tendency to increase the paper feeding failure due to the change in the thickness of the paper, the material of the paper, whether the paper is coated, whether to print, and the width of the paper.

In order to solve the above problems, the present invention intends to disclose three techniques.

First, there is a need for a technique for uniformly controlling the friction between the feeding roller and the paper.

The second is a technology that allows the user to easily set the range of allowable friction according to the paper material, thickness, width, coating or not, and whether to print.

Lastly, the component for sensing is simple, and it is a technology that can maintain reliability that does not cause residual trouble.

In order to achieve the object of the above technology, in the present invention, in order to maintain the frictional force between the feeding roller and the paper in a certain range, it is necessary to control a range in which the control method is controlled in a specific range in the on-off binary concept.

Therefore, in the present invention, in order to grasp the position of the cut sheet being lifted, it is intended to disclose a cut sheet feeder replacing the existing photo sensor 66 with a pressure sensor 60 to a distance measuring sensor.

3 is a perspective view (A), a side view (B) and a front view of a preferred embodiment of the present invention, FIG. 4 is a front perspective view (A) and a rear perspective view (B) with the cover 10 removed, and FIG. 5 is It is a top view of the state in which the cover 10 is removed.

The present invention includes a frame 11 including a cover 10; The frame 11 is provided with a lifting motor 21 attached to one side of the frame, a rotating screw 23 connected to the lifting motor 21, and a lifting plate 24 connected to the rotating screw to move up and down. A lifting assembly 20; A rotating motor 31 attached to one side of the frame 11; A conveying assembly 30 having a conveying roller 35 and a feeding roller 37 connected via the rotary motor 31, the pulley 33, and the shafts 34, 36; A paper width adjusting member 40 connected to the fixing bar 20 of the frame 11 to guide the width of the paper; In the sheet feeder comprising a paper connected to the feeding shaft 36 and lifted A sensing plate 70 in contact with; A deformation amplifying member 64 attached to the sensor fixing member 42 fastened to the fixing bar 20 of the frame 11 and having a hole 65 for deformation amplification; A pressure sensor 60 attached to the deformation amplifying member 64 and one side portion; A spring 62 positioned between the deformation amplifying member 64 and the sensing plate 70; It is characterized in that it comprises; guides the position of the spring 62 and guide shaft 61 that moves up and down while in contact with the sensing plate 70.

The frame 11 is the body of the sheet feeder, and supports the elevating assembly 20 and the conveying assembly 30. In addition, it includes an operation unit 15 that can be controlled by the user on one side portion, and a power control unit 14 that supplies power to the control panel 13, the elevating motor 22, and the rotating motor 31.

The lower end of the frame 11 may be provided with wheels to increase mobility.

The cover 10, as shown in Figure 1, one side portion is provided with a paper feed hole for feeding a high-speed printer or a high-speed printer cut sheet, and the other side portion has an opening to facilitate the continuous stacking of cut sheets on the lifting plate. It is preferably provided.

Referring to FIG. 4, the lifting assembly 20 includes a lifting motor 21 attached to one side of the frame 11, a rotating screw 23 connected to the lifting motor 21, and the rotating screw 23 ) Is connected to the lifting plate 24 to move up and down.

In order to facilitate the movement of the lifting plate 24, it is preferable to provide an LM guide 25 on one side of the frame 11, and the LM guide 25 and the lifting plate 24 are connected to move. Do.

In order to increase the maximum stacking capacity on the lifting plate 24, the lifting motor 21 is not connected in series with the rotating screw 23, it is characterized in that it is located in a spaced apart place through the power transmission member and the reduction gear. With the above configuration, the sheet feeder can stack up to 3,000 to 6,000 sheets.

5 to 6, the transfer assembly 30 includes a rotary motor 31 attached to one side of the frame 11; And a feed roller 35 and a feeding roller 37 connected via the rotary motor 31, the pulley 33, and the shafts 34 and 36.

The conveying roller 35 has a function of feeding a printer or a printer to a printer or a printer while gripping a sheet of paper with a pair of rollers, and therefore is preferably composed of a pair, and prevents double feeding to prevent two or more sheets from being fed. It is preferable to provide the sensor in front or rear.

The feeding roller 37 is a roller for supplying a sheet by the frictional force between the feeding roller 37 and the paper in the stacked sheet paper, and is provided with a rubber pad or a groove having a predetermined pattern to increase friction. Formed in wealth.

The connecting shaft of the feeding shaft 36 and the belt 32 is characterized by having a clutch (39). The feeding shaft 36 may cause safety accidents due to the rotation of the feeding roller 36 when the operator stacks the sheet of paper on the lifting plate 24, and requires control such as pause when resetting the lifting position. do. Therefore, a clutch 39 for controlling the rotation of the feeding roller 37 is needed.

The clutch 39 is preferably an electronic magnetic clutch, and in some cases, a pneumatically operated clutch may also be used.

6 is a front perspective view (A) and a lower perspective view (B) of the transport assembly 30 and the width adjustment assembly.

As shown in Fig. 6, a member capable of supporting the stacked paper according to the width and length of the cut sheet is required, and the paper width connected to the fixing bar 20 of the frame 11 to guide the width of the paper It includes an adjustment member 40.

The width adjustment member 40 is provided with a fixing screw 41 on one side portion can be fixed to the width and length of the cut sheet at a specific position of the fixing bar 20.

FIG. 7 is a state diagram of paper lifting using a pressure sensor, and FIG. 8 is a front view of the sensing plate 70 and the pressure sensor 60.

Referring to Figures 2A, 7 and 8, the sheet feeder of the present invention is connected to the feeding shaft 36, the sensing plate 70 in contact with the lifting paper; A deformation amplifying member 64 attached to the sensor fixing member 42 fastened to the fixing bar 20 of the frame 11 and having a hole 65 for deformation amplification; A pressure sensor 60 attached to the deformation amplifying member 64 and one side portion; A spring 62 positioned between the deformation amplifying member 64 and the sensing plate 70; It is characterized in that it comprises; guides the position of the spring 62 and guide shaft 61 that moves up and down while in contact with the sensing plate 70.

The sensing plate 70 is provided with a tilting hole 73 on one side surface, a sensing roller 71 in contact with a sheet of paper, and a stepped portion having a structure mounted on a fixing bar 12 of the frame 11 ( 72).

The tilting hole 73 of the sensing plate 70 is connected to the feeding shaft 36, and the sensing plate 70 is tilted based on the feeding shaft 36.

The stepped portion 72 of the sensing plate 70 has two functions. The first is for mounting on the fixing bar 12, and the second is for contacting the limit sensor 69. Therefore, it is located at the end of the sensing plate 70, it is preferable to be positioned somewhat high.

As shown in Figure 8, the deformation amplification member 64 is attached to the sensor fixing member 42 fastened to the fixing bar 20 of the frame 11, and has a hole 65 for deformation amplification , It includes a pressure sensor 60 attached to the upper end of the hole (65).

The deformation amplifying member 64 is preferably provided with a certain length in a thin film form. In the present invention, considering the size of the sheet, it is configured in a bar shape, but may be modified in various forms depending on the case.

The deformation amplifying member 64 is for measuring the displacement of the tilting angle of the sensing plate 70 with a pressure sensor, and a method for amplifying the pressure change is required to accurately measure the minute pressure change. It is characterized in that a hole 65 is formed in the deformation amplifying member 64 so that the amount of deformation increases around the hole.

In order to convert the tilted displacement of the sensing plate 70 into a pressure displacement, in the present invention, the guide shaft 61 provided with the round rod 63 at the end portion and the guide shaft 61 penetrate the guide shaft 61 to amplify the deformation It is characterized by including a spring (62) located between the member 64 and the sensing plate (70).

The round bar 63 is located at the end of the guide shaft 61, it is preferable to contact the sensing plate 70.

The round bar 63 has two functions. First, the spring 62 is pressed while moving in accordance with the vertical movement distance of the sensing plate in contact with the sensing plate 70 to form pressure energy in proportion to the displacement of the sensing plate.

The second function is to hold the spring 62. The spring 62 has a round bar on one side and a deformation amplifying member 64 on the opposite side. Therefore, the spring 62 is positioned between the round bar 63 and the strain amplifying member 64.

As shown in FIG. 7, when the tilting angle changes as the sensing plate 70 moves up and down, the pressure sensor value exceeds the set pressure value, and the control panel 13 displays the information. It recognizes and stops the driving of the elevating motor.

8A is an initial stage of tilting of the sensing plate 70, and there is no displacement of the pressure sensor, and FIG. 8B shows that the lifting plate 24 is raised so that the sensing plate 70 is in a normal state and the range of the pressure sensor is set pressure range The supply of paper inside and the driving of the lifting motor 24 are continuously performed, and FIG. 8C is a step in which the rising plate 24 is abnormally raised and the sensing plate 70 is in contact with the limit sensor 69, wherein In the case of abnormal conditions, the paper supply is stopped and an alarm warning is issued to the user.

In some cases, the pressure sensor 60 may further include a sensor voltage amplifier.

According to the present invention, since the frictional force between the feeding roller and the paper can be controlled within a set value range compared to the conventional photo sensor method, the lifting and lowering control of the paper and the feeding control of the paper can be continuously operated.

If the component of the present invention is applied, it can be applied as a pressure sensor 60 in contact with the spring 62.

Therefore, the cut sheet feeder of the present invention is connected to the feeding shaft 36, the sensing plate 70 in contact with the lifted paper; A pressure sensor 60 attached to a sensor fixing member 42 engaged with a fixing bar 20 of the frame 11; A spring 62 positioned between the pressure sensor 60 and the sensing plate 70; It is characterized in that it comprises; guides the position of the spring 62 and guide shaft 61 that moves up and down while in contact with the sensing plate 70.

The application technology is a method in which the pressure sensor 60 contacts the spring 62. That is, since the amount of tilting displacement of the sensing plate 70 and the amount of displacement at which the spring is compressed are proportional, the pressure applied to the spring 62 can be directly measured.

The pressure sensor 60 may be attached to the sensor fixing member 42 fastened to the fixing bar 20 of the frame 11, and in some cases, a connecting member attached to the sensor fixing member 42 is further added. Including, a pressure sensor 60 may be attached to the connecting member.

Another application is to use a distance measuring sensor.

The distance measurement sensor is a distance measurement method using a laser, which is inversely proportional to the distance measurement sensor according to the tilting displacement of the sensing plate 70.

Therefore, in the sheet paper feeder of the present invention, it is connected to the feeding shaft 36, the sensing plate 70 in contact with the lifting paper; It characterized in that it comprises; a distance measuring sensor attached to the sensor fixing member 42 fastened to the fixing bar 20 of the frame (11).

9 is a control flow diagram of one preferred embodiment of the present invention.

9, the preferred operating principle of the sheet feeder of the present invention is as follows.

When the elevating motor 21 rotates and the elevating plate 24 rises, the sheet paper is in close contact with the feeding roller 37 and detects pressure on the pressure sensor 60 to reach the preset value. The paper is fed while being stopped and the feeding roller 37 rotates.

At this time, if the pressure change is continuously measured during the paper feeding process, and the pressure is lower than the set reference value, the elevating motor 21 is always operated to constantly control the pressure between the feeding roller 37 and the paper, so that smooth feeding is possible at high speed.

When the user inputs the feeding condition and the pressure set value through the control unit 15, the control panel 13 compares the preset pressure value with the measured value of the pressure sensor 60 through the drive of the elevating motor 24 that is not reached. By rotating the elevating motor 21 to raise the elevating plate 24, the paper and the feeding roller 37 are in close contact, and when the measured value of the pressure sensor 60 is equal to the set pressure value of the control panel 13, the elevating motor ( 21) Stop.

The sheet paper feeder continuously controls the lifting motor by comparing the measured value and the set pressure value through the pressure sensor 60 even during operation, so that the pressure between the feeding roller and the paper can be constantly controlled.

When the elevating motor operates abnormally and the sensing plate 70 contacts the limit sensor 69, the operation of the sheet feeder is stopped, and an alarm is alerted to the administrator.

10: cover, 11: frame, 12: fixed bar,
13: control panel, 14: power supply, 15: control panel,
16: vent opening,
20: elevating assembly, 21: elevating motor, 22: reducer,
23: rotating screw, 24: lifting plate, 25: LM guide,
26: lifting groove,
30: transfer assembly, 31: rotary motor, 32: belt,
33: pulley, 34: transfer roller, 35: transfer shaft,
36: feeding shaft, 37: feeding roller, 39: clutch,
40: paper width adjustment member, 41: fixing screw, 42: sensor fixing member,
50: blower, 51: fan, 52: duct,
53: blower,
60: pressure sensor, 61: guide shaft, 62: spring,
63: round bar, 64: deformation amplification member, 65: hole,
66: photosensor, 69: limit sensor,
70: sensing plate, 71: sensing roller, 72: stepped,
73: Tilting hole, 74: Pin
100: paper supply unit

Claims (4)

A frame 11 including a cover 10; It has a lifting motor 21 attached to one side of the frame 11, a rotating screw 23 connected to the lifting motor 21, and a lifting plate 24 connected to the rotating screw to move up and down. One lifting assembly 20; A rotating motor 31 attached to one side of the frame 11; A transfer assembly 30 having a feed roller 35 and a feed roller 37 connected via the rotary motor 31, the pulley 33, and the feed and feed shafts 34, 36; In connection with the fixing bar 20 of the frame 11, a sheet width adjusting member 40 for guiding the width of the paper;
A sensing plate 70 connected to the feeding shaft 36 and in contact with the elevating paper;
A deformation amplifying member 64 attached to the sensor fixing member 42 fastened to the fixing bar 20 of the frame 11 and having a hole 65 for deformation amplifying;
A pressure sensor 60 attached to the deformation amplifying member 64 and one side portion;
A spring 62 positioned between the deformation amplifying member 64 and the sensing plate 70;
A guide sheet 61 for guiding the position of the spring 62 and moving up and down while coming into contact with the sensing plate 70.
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