JPH0747387Y2 - Printer feeding device - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial field of application] The present invention conveys sheets to a printing machine,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding device for feeding paper, and particularly to a structure for reliably feeding a curled sheet.

[0002]

2. Description of the Related Art An outline of a conventional printing paper feeding device will be described with reference to FIG. 9A. The sheet bundle 2 formed by stacking a large number of sheets 27 is stacked on a stacking base 9. Then, the sheets 27 are conveyed to the printing process one by one from the top of the sheet bundle 2 and subjected to a predetermined printing process.

A plurality of sheets may adhere to the sheet 27 due to static electricity or the like. In such a case, double-sheet feeding or the like occurs, which hinders the subsequent printing process. Therefore, in order to prevent the feeding of two sheets and to reliably convey only one sheet to the printing process, the following method is adopted.

As shown in the figure, a blowing nozzle 6 is provided near the upper end of the sheet bundle 2 and air is ejected toward the sheet bundle 2. By blowing this air, several to several tens of sheets 27 on the upper side of the sheet bundle 2 are floated and separated from the sheet bundle 2 to form a separated sheet 10. By separating the sheet 27 in this way, it is possible to prevent double sheet feeding due to static electricity or the like. The blowing nozzle 6
Sheet separate 12 is attached to the upper part of
This sheet separate 12 separate sheets 10 best sheets
27 touches. As a result, the floating height of the sheet 27 is restricted, and the uppermost sheet 27 is held at a fixed position.

The conveyance of the sheet 27 to the printing process is specifically performed as follows. A suction foot 8 is located near the top of the separation sheet 10 as shown in the figure. This suction foot 8 first descends in the direction of the arrow 92, and separates the sheet.
The uppermost sheet 27 of 10 is adsorbed and held. And arrow
After rising in the 91 direction, it moves in the direction of arrow 93 and conveys the sheet 27 to a predetermined printing process. In addition, sheet bundle 2
If the number decreases, the loading platform 9 rises accordingly.

[0006]

The above-mentioned conventional printing press paper feeding device has the following problems. As shown in FIG. 9B, the sheet 27 to be transported may be curled due to the influence of the ink being dried or the printing process being performed once. In such a case, the sheet 27 and the suction surface 8Q of the suction foot 8 are not positioned in parallel, and the suction foot 8 cannot reliably suck the sheet 27. That is, there is a problem that a suction failure occurs and the paper feeding and printing operations are hindered. Further, if the curl-like curvature is corrected to a flat surface each time, a lot of time is required for the work, and the paper feeding and printing efficiency are deteriorated.

In order to solve such a problem, the actual fairness 3-
The mechanism shown in Japanese Patent No. 6593 has been proposed. In this invention, the suction lever 8 is rotated by operating the operation lever 60, and the angle of the suction surface 8Q is adjusted so as to match the paper surface of the sheet paper 27. The outline will be described with reference to FIG. A connecting arm 62 is fixed to the suction foot 8 and is held so as to be rotatable about the suction foot shaft J3 in the directions of arrows 97 and 98. The other end of the connecting arm 62 is held by the penetrating shaft J2 of the rotating portion 61, and the other end is positioned so as to be penetrable in the direction of arrow 99. A spring 63 is attached to the connecting arm 62 to apply pressure in the directions of arrows 99 and 100.

The rotating portion 61 is rotatably supported by the rotating portion shaft J1. Then, the operation lever 60 is attached to the rotating portion 61.
Is fixed, and the angle of the suction surface 8Q of the suction foot 8 is adjusted by operating the operation lever 60. That is, if the operating lever 60 is raised in the direction of arrow 95, the connecting arm 62 is lowered via the penetrating shaft J2, whereby the suction foot 8 is moved to the arrow direction.
Rotate in the desired direction in the 97 direction.

In this way, the angle of the suction surface 8Q is adjusted to suck and convey the curled sheet 27. However, in this structure, the angle adjustment must be performed by manually operating the operation lever 60. The curl state of the sheet 27 may be different depending on each case, and if manual adjustment is performed each time, there is a problem that it takes time. or,
It is necessary to make an adjustment while visually confirming the angle of the suction surface 8Q, which further lowers the work efficiency.

In view of the above, the present invention is capable of reliably adsorbing and holding a curled curved sheet and transporting it to the printing process, without requiring manual adjustment, and having a simple mechanism.
In addition, it is also possible to sufficiently cope with higher printing speed.
An object of the present invention is to provide a paper feeding device for a printing machine.

[0011]

SUMMARY OF THE INVENTION A printer paper feeder according to the present invention comprises a sheet bundle formed by superposing a plurality of sheets, and a sheet above the sheet bundle by air blowing. An air jetting part that floats and separates, a transport part that holds the topmost sheet of the separated sheet at its contact surface and transports it to the printing process, so that it can rotate about a rotation axis. Conveyance unit pivotally supported on two or more fixedly installed separation state detectors
A is, against the two or more thickness side portions of the separate sheet
, The separated light receiving signals are emitted in the range of a predetermined width, the reflected light from the thickness side surface is received, and the separated light receiving signals are output respectively. Capture, recognize the curl-like curvature of the sheet,
An angle adjusting unit that has an adjusting unit that outputs an angle adjusting signal according to the degree of bending and a connecting arm that is connected to and fixed to the conveying unit. It is characterized in that it is provided with an angle adjusting section for moving the carrying section by a fixed amount and turning the carrying section about a turning axis so that the contact surface of the carrying section is positioned substantially parallel to the sheet surface of the curved sheet.

[0012]

In the printer paper feeding device according to the present invention, two or more separation state detectors receive the reflected light from the thickness side surface portions of the separated sheets and output the separation state reception signal. The separated state light receiving signal is taken into the adjusting means, and the angle adjusting signal is output based on this. Then, the angle adjusting unit moves the connecting arm by a predetermined amount to rotate the transport unit about the rotation axis so that the contact surface of the transport unit is positioned substantially parallel to the curved sheet surface. Therefore, the curled sheet can be positioned substantially parallel to the contact surface of the transport section without any manual adjustment. Also books
In the printer feeding device according to the invention, two or more separate
The state detector is fixedly installed and separate sheets
Irradiation light within a predetermined width range on two or more thickness side surfaces
Is irradiating. Therefore, for example, in the curved state of a sheet
Provide a mechanism to follow each other and move each separation state detector
No need.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A printer paper feeder according to an embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 shows an example of the overall structure of the printing press paper feeding device. A sheet bundle 2 composed of a large number of sheets 27 is stacked on a stacking base 9. Then, the sheets 27 are sequentially conveyed to the printing process one by one from the uppermost one and subjected to a predetermined printing process. If the height of the sheet bundle 2 is lowered by feeding the paper, the stack 9 is raised.

The sheet 27 may adhere to the sheet 27 due to static electricity or the like, and two sheets may be fed. In order to prevent the double sheet feeding and the like, a blowout nozzle 6 as an air blowout portion
Air is jetted from. By this air ejection, the upper sheet 27 is lifted and the separated sheet 10 is formed (see FIG. 9A). A sheet separate 12 is provided above the blow-out nozzle 6, and the uppermost sheet 27 is in contact with the sheet separate 12 to regulate the floating height of the sheet 27 (see FIG. 9A). The air ejected from the blowout nozzle 6 is supplied through the air hose 60. The proportional flow rate control valve 61 provided in the air hose 60 receives the ejection control signal from the control device 31 and starts or stops the supply of air.

In the vicinity of the suction foot 8 or the sheet separate 12, as shown in FIG. 1, a photoelectric sensor 2 which is a thickness detector.
1, 22 are fixedly provided. This photoelectric sensor 21, 2
Reference numeral 2 denotes a reflection type sensor, which irradiates the side surface of the separation sheet 10 floated by the blowing nozzle 6 with irradiation light.
This state is shown in FIG. The irradiation light from the photoelectric sensors 21 and 22 forms detection areas M1 and M2 having a predetermined width with respect to the side surface of the separation sheet 10.

The irradiation light applied to the detection areas M1 and M2 is reflected by the thickness side surface of the sheet 27 to generate reflected light. And
The reflected light is received by the photoelectric sensors 21 and 22, respectively, and the output values G1 and G2 are captured by the control device 31 through the lines L1 and L2. When many sheets 27 are located in the detection areas M1 and M2, the amount of reflected light also increases and the amount of received light increases.
On the other hand, if the number of sheets 27 is small, the amount of reflected light will be small and the amount of received light will be low.

To convey the sheet 27, specifically, the suction foot 8 which is a conveying section sucks the sheet 27 by its suction surface 8Q,
Do by moving. The connecting arm 4 is fixed to the suction foot 8 as shown in FIG. The other end of the connecting arm 4 is connected at a connecting arm mounting block 71, and a screw shaft 70 rotated by the drive motor 32 is screwed into and penetrates the connecting arm mounting block 71.

The drive motor 32 rotates forward and backward based on the screw shaft rotation signal from the controller 31 to rotate the screw shaft 70. This screw shaft
As the 70 rotates, the connecting arm mounting block 71 moves back and forth on the screw shaft 70. Further, the potentiometer 75 takes in the rotation amount of the screw shaft 70 through the line L4 and detects the position of the connecting arm attachment block 71 based on this.

The detailed structure of the controller 31 will be described with reference to FIG. The control device 31 includes a ROM 41, a CPU 42, and an RA.
The M42 is provided, and the CPU 42 controls each unit according to the program stored in the ROM 41. Input interface
Lines L1 and L2 provided with amplifiers 48 and 49, A / D converters 46 and 47, lines L5 and L6, and line L4 provided with an A / D converter 52 are connected to 44. on the other hand,
Lines L3 and L7 are connected to the output interface 45. The line L3 sends a forward rotation signal and a reverse rotation signal to the drive motor 32 as a screw shaft rotation signal.

Next, the specific operation of the sheet feeding device in this embodiment will be described with reference to the flowchart of FIG. This program is stored in the ROM 41, and starts processing when a paper feed start signal from the printer body (not shown) is input through the line L5. Further, along with the start of the processing, an ejection control signal is given to the proportional flow rate control valve 61 via the line L7, and air is ejected from the ejection nozzle 6.

First, the CPU 42 determines whether or not the detection start signal is input via the line L6 (step S2).
The detection start signal is a signal output by the proximity switch 72, and is output when the proximity cam 73 attached to a predetermined rotating portion of the printing machine is detected. That is, in this embodiment, since the processing from step S4 is performed for each rotation of the printing machine, the adjustment processing is immediately executed even if the number of rotations of the printing machine changes, and the more reliable sheet 27 Transport becomes possible.

Step when the detection start signal is input
Proceed to S4, where the output value G output by the photoelectric sensors 21, 22
Take in 1, G2. Now, it is assumed that the sheet 27 to be fed is curled upward as shown in FIG. In such a case, the sheet 27 and the suction surface of the suction foot 8
8Q is not located in parallel, so reliable suction and transfer cannot be performed. Therefore, the following processing is executed.

When an upward curl occurs, the number of sheets 27 in the detection area M1 becomes larger than the number of sheets 27 in the detection area M2 as shown in the figure. That is, the CPU 42 recognizes that the sheet 27 is curled upward based on that the fetched output value G1 is larger than the output value G2. The difference between the two output values is proportional to the degree of curl of the sheet 27, that is, the inclination angle.

Therefore, the CPU 42 performs the processing shown in step S6 of FIG. Here, θ represents the inclination angle of the sheet 27, and is obtained by multiplying the difference (G1-G2) of the output values by the proportional constant a. The proportional constant a is a value previously stored in the ROM 41. After calculating the inclination angle of the sheet 27 in this way,
As shown in FIG. 6, the suction foot 8 is rotated in the direction of arrow 97 by an angle θ to position the suction surface 8Q substantially parallel to the sheet 27.

The details of the rotating structure of the suction foot 8 are shown in FIG.
It will be described based on. Adsorption foot 8 is adsorption foot axis J6
It is rotatably supported by the arrows 97 and 98.
The connecting arm 4 is connected and fixed to the suction foot 8. That is, the angle of the suction foot 8 can be changed by adjusting the connecting arm 4. The other end 4H of the connecting arm 4 is supported by the through shaft J5 and penetrates the through hole 7a of the through shaft J5. That is, the other end 4H of the connecting arm is formed by the arrows 99, 10 inside the through hole 7a.
It can move freely in 0 direction. Further, the penetrating shaft J5 is connected to the connecting arm mounting block 71 and is rotatably located on the connecting arm mounting block 71 in the direction of arrow 103. A spring 63 is attached to the connecting arm 4,
Pressure is applied in the directions of arrows 99 and 100.

A screw shaft 70 is screwed into and penetrates the connecting arm mounting block 71. Therefore, the connecting arm attachment block 71 moves in the directions of the arrows 101 and 102 by a predetermined length in accordance with the forward and reverse rotations of the screw shaft 70. When the suction foot 8 is rotated from the state shown in FIG. 5 to the state shown in FIG. 6, first, the CPU 42 outputs the output interface 45,
A normal rotation signal is output as a screw shaft rotation signal through the line L3 (see FIGS. 1 and 3). Then, this positive rotation signal is given to the drive motor 32. Drive motor
32 rotates the screw shaft 70 by the commanded angle in the forward rotation direction based on the forward rotation signal.

In FIG. 2, when the screw shaft 70 rotates forward by a predetermined angle, the connecting arm mounting block 71 accordingly moves by a length corresponding to the arrow 102 direction.
As a result, the connecting arm 4 moves in the direction of arrow 97, and the suction foot 8 can be rotated by a desired angle (θ).
In this case, the other end 4H of the connecting arm 4 projects in the arrow 100 from the through hole 7a. As described above,
The suction surface 8Q comes to be positioned parallel to the sheet 27.

When the sheet 27 is curled downward as shown in FIG. 7, the number of sheets 27 in the detection area M1 is smaller than the number in the detection area M2. That is, the output value G1 becomes smaller than the output value G2, and the difference (G1-G2) between the output values becomes a negative value in step S6 of FIG. Therefore, the suction foot 8 is rotated in the direction of the arrow 98 as shown in FIG. 8, and the suction surface 8Q and the sheet 27 are adjusted to the parallel position.
Specifically, the CPU 42 outputs a reverse rotation signal as a screw shaft rotation signal, reversely rotates the screw shaft 70, moves the connecting arm mounting block 71 in the direction of arrow 101, and rotates the suction foot 8 in the direction of arrow 98. (Fig. 2).

In the above embodiment, the sheet feeding device of the universal type printing machine has been described as an example, but it may be applied to the stream type sheet feeding device. Further, instead of the reflection type photoelectric sensors 21 and 22, a capacitance sensor or the like may be used as long as the number of lifted sheets on the separated sheet 10 can be detected.

Further, in this embodiment, a proximity switch
Although the output values G1 and G2 at the moment when the detection start signal of 72 is input are taken in (see step S2 in FIG. 4), the output value in a predetermined section during one rotation of the printing machine or the total output during one rotation You may perform control based on the average value of a value. Further, in the above embodiment, the entire suction foot 8 is rotated, but it is also possible to adjust only the tip of the suction foot 8 or the angle of the suction pad itself.

[0031]

In the paper feeder of the printing press according to the present invention, the angle adjusting unit moves the connecting arm by a predetermined amount, and the transport unit is rotated about the rotation axis. That is, the curled sheet can be positioned substantially parallel to the contact surface of the transport section without any manual adjustment. Therefore, the curved sheet can be easily and reliably conveyed to the printing process. In addition, the printing machine supply according to the present invention
In paper equipment, two or more separation state detectors are fixed.
Two or more thick side sections of separate sheets provided
The irradiation light is emitted in a predetermined range. You
That is, for example, each separation is made to follow the curved state of the sheet.
It is not necessary to provide a mechanism for moving the state detector. this
As a result, the mechanism is simple and quick detection is possible, and printing is possible.
It is possible to sufficiently cope with the increase in speed.

[Brief description of drawings]

FIG. 1 is a side view showing the overall structure of a printing press feeding device according to an embodiment of the present invention.

FIG. 2 is an enlarged view showing details of a vicinity of a suction foot and a connecting arm of the printing press paper feeding device shown in FIG.

FIG. 3 is a block diagram showing a detailed configuration of a control device of the printing press paper feeding device shown in FIG. 1.

FIG. 4 is a flowchart showing an example of a program stored in a ROM.

FIG. 5 is a side view showing a relationship between a sheet having an upward curl and a suction foot.

6 is a side view showing a state in which a suction foot is rotated from the state shown in FIG.

FIG. 7 is a side view showing a relationship between a sheet having a downward curl and a suction foot.

8 is a side view showing a state in which the suction foot is rotated from the state shown in FIG.

FIG. 9 is a side view for explaining a conventional printing press paper feeding device.

FIG. 10 is a side view for explaining another conventional printing press paper feeding device.

[Explanation of reference signs] 2 ... Sheet bundle 4 ... Connection arm 6 ... Blowing nozzle 8 ... Adsorption foot 21, 22 ... Photoelectric switch 70 ... ... Screw shaft 71 ... Connecting arm mounting block

Claims (1)

[Scope of utility model registration request] 1. A sheet bundle constituted by superposing a plurality of sheets, an air jetting portion for floating and separating the upper sheet of the sheet bundle by air jetting, and an uppermost sheet of the separated sheets. Is a conveyance unit that holds the sheet of paper by its contact surface and conveys it to the printing process. The conveyance unit is rotatably supported about a rotation shaft, and is fixedly provided. The above separation state detector,
Predetermined size for the two or more thickness side portions of the separate sheet
Two or more separation state detectors that irradiate irradiation light in the range of the depth, receive reflected light from the side surface of the thickness, and output separation state reception signals, respectively. An adjusting unit for recognizing curl-like curving of the paper and outputting an angle adjusting signal according to the degree of the curving; an angle adjusting unit having a connecting arm fixed to and connected to the transporting unit. And an angle adjusting unit that positions the contact surface of the transport unit substantially parallel to the curved surface of the sheet by rotating the transport unit about the rotation axis by moving the connecting arm by a predetermined amount based on the A paper feeder for a printing press, comprising: