JP2005089142A - Paper feeding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper feeding device which can automatically adjust the angle of a separating plate in a simple mechanism in response to an adjusting state of paper feeding pressure, and prevents enlargement of the device. <P>SOLUTION: The paper feeding device comprises a separating member 55 disposed to tilt a sliding surface slidably contacting with a paper feed roller 7 to a predetermined separating angle with respect to the paper surface of paper 25, a movable bar 53 which has a separating member energizing means for energizing the separating member 55 toward the paper feed roller 7 at a predetermined separating pressure and supports the separating member 55 rockably in a predetermined range with the separating member energizing means, a first spring 60 for energizing the separating member 55 in the increase direction of the separating angle, and a second spring 61 for energizing the separating member 55 and the movable bar 53 toward the paper feed roller 7. In this paper feeding device, by sliding of the paper feed roller 7 and the paper 25 caused by the rotation of the paper feed roller 7, the separating member 55 rocks back and forth in the conveying direction of the paper 25 to vary the separating angle of the separating member. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a paper feeding device and relates to a technique for supplying paper in a stencil printing device or the like.

  An example of a paper feed mechanism unit in a conventional stencil printing apparatus is shown in FIGS. In FIG. 8, the sheet feeding plate 2 and the sheet feeding tray 3 that are disposed on the main body casing 1 so as to be movable up and down are moved up and down by an elevator motor 4 and a drive mechanism 5. Three paper feed rollers 7 mounted on the drive shaft 6 are arranged above the rear end of the paper feed plate 2, and a paper feed stepping motor 9 is connected to one end of the drive shaft 6 via a timing belt 8. Yes.

  A paper feed pressure adjusting device 10 is provided on the other end side of the drive shaft 6, and the paper feed pressure adjusting device 10 holds the other end of the drive shaft 6 rotatably by a shaft support arm 11. One end of the shaft support arm 11 is pivotally attached to the main body casing 1, and the other end is connected to one end of a paper feed pressure adjustment lever 13 via a paper feed pressure adjustment spring 12.

  The paper feed pressure adjusting lever 13 is swingable about a support shaft. The shaft support arm 11 swings upward by depressing the operation portion 13a at the other end, and the shaft support arm 11 is moved by pushing up the operation portion 13a. Swings downward. When the shaft support arm 11 swings upward, the paper feed pressure applied to the paper by the paper feed roller 7 decreases, and when the shaft support arm 11 swings downward, the paper feed pressure applied by the paper feed roller 7 to the paper. Becomes larger.

  As shown in FIGS. 5 to 6, the paper separator 14 provided opposite to the paper feed roller 7 located in the center has a stud 15 fixedly attached to the main casing 1 and feeds a movable bar 16 to the stud 15. A pressing spring 17 and an adjuster 18 are provided between the stud 15 and the movable bar 16 to urge the movable bar 16 toward the paper feed roller 7. Sabaki member 19 is provided.

The crumbling member 19 includes a base portion 20 that fits into the movable bar 16 and a crust plate 22 made of resin attached to the top portion 21 of the base portion 20, and the crust plate 22 is in sliding contact with the paper feed roller 7.
The paper feed plate 2 is provided with a paper presence / absence sensor 23 and an actuator 24 for detecting the presence / absence of paper. As shown in FIG. 6, when the paper 25 is placed on the paper feed plate 2, the actuator 24 passes through. The state where the sheet is present is detected by swinging to the light position and passing through the sheet presence / absence sensor 23, and when the sheet 25 is not on the sheet feeding plate 2, the actuator 24 is swung to the light shielding position to detect the sheet presence / absence sensor. The state where there is no paper is detected by shielding the light 23.

  The paper 25 is set according to the procedure shown in FIG. The paper feed tray 3 is opened, the paper feed guide lock lever 26 is released, the left and right paper feed guides 27 are moved according to the size of the paper 25, and then the paper feed guide lock lever 26 is placed in the locked state. The paper 25 is placed between the paper feed guides 27.

  At the time of paper feeding, a control device (not shown) drives the elevator motor 4 to raise the paper feeding plate 2 and the paper feeding tray 3 and bring the paper 25 into contact with the paper feeding roller 7. As shown in FIG. 6, the paper 25 in contact with the paper feed roller 7 is sent out between the paper feed roller 7 and the suction plate 22 by the rotation of the paper feed roller 7. At this time, if the sheets 25 are overlapped, the sheet 25 that is in contact with the sheet plate 22 stays at the frictional force of the sheet plate 22, and only the sheet 25 that is in contact with the sheet supply roller 7 is sent out by the frictional force of the sheet supply roller 7. .

  As shown in FIG. 7, the paper 25 that has passed through the paper feed roller 7 and the suction plate 22 is sent out between the timing roller 28 and the guide roller 29, and is driven between the press roller 30 and the drum 31 by the rotational drive of the timing roller 28. It is sent out, printed by the rotation of the drum 31, and sent out.

  A mechanism for rotating the timing roller 28 includes a paper feed cam 32 that rotates integrally with the drum 31, a pair of links 34 and 35 that have a cam follower 33 that is slidably in contact with the paper feed cam 32 at one end, A timing segment 36 connected to the other end of the link 34, a rack 37 formed on the timing segment 36, a pinion gear 38 that meshes with the rack 37 and rotates integrally with the timing roller 28, and a link fulcrum of the other link 35 And a fulcrum adjustment plate 40 that holds 39.

  In this configuration, when the thick paper 25 is used, when the paper 25 is idle, the paper feed pressure adjusting lever 13 is operated to largely adjust the paper feed pressure. When the thin paper 25 is used, the paper When 25 sheets are fed, the sheet feeding pressure adjustment lever 13 is operated to adjust the sheet feeding pressure to a small value.

  On the other hand, the paper separator 14 adjusts the urging force of the pressing spring 17 by operating the adjuster 18 at the time of initial adjustment at the factory, and adjusts the friction pressure of the separator plate 22 against the paper 25 to set the frictional force to an appropriate value. It is moderate. However, even if the paper feed pressure is adjusted, depending on the thickness and quality of the paper 25, double feeding or idling may occur during printing. In this case, the paper pressure device 14 needs to adjust the paper pressure. However, the delicate adjustment is not easy for the user.

Prior art documents relating to this paper mackerel technique include those disclosed in the following Patent Documents 1 to 3.
JP 2000-247467 A Japanese Patent Laid-Open No. 2001-19186 JP 2000-72266 A

  The invention of Patent Document 1 discloses means for automatically switching a plurality of separation pads having different friction coefficients against a sheet with a control device, and means for automatically switching the angle of the separation member, each means being a gear mechanism, It consists of a drive motor, sensor, and the like. Further, the invention of Patent Document 2 discloses means for detecting the paper conveyance state to determine the paper quality of the paper, and changing the angle of the paper plate according to the paper quality. The paper of the paper detected by the leading edge position detection sensor is disclosed. Based on the standby position, the servo motor of the servo angle adjusting means is controlled. Further, the invention of Patent Document 3 discloses means for manually adjusting the angle of the friction pad via a link mechanism, and the fulcrum position of the guide holder that holds the friction pad is changed by moving the link with an adjusting screw. It is something to be made.

  However, the techniques of Patent Documents 1 and 2 require a sensor for detecting the quality and type of paper, a power source and a drive mechanism for changing the angle of the separation pad and the plate, and the number of parts is large. There is a problem that the apparatus configuration is complicated and the apparatus becomes large. Further, although the technique of Patent Document 3 does not require a sensor or a drive source, it is necessary for the user to operate it, and the delicate adjustment is not easy for the user, and trial and error is required.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and provides a paper feeding device that can automatically adjust the angle of the baffle plate with a simple mechanism in accordance with the adjustment state of the paper feeding pressure, and does not increase the size of the device. The purpose is to provide.

  In order to solve the above-described problem, a paper feeding device according to a first aspect of the present invention includes a paper feeding roller that is in contact with the uppermost paper surface of a paper bundle, and a paper feeding pressure adjustment that sets a paper feeding pressure of the paper feeding roller for the paper. Means, a surface member that is slidably contacted with the paper feed roller and inclined at a predetermined surface angle with respect to the paper surface of the paper, and the surface member is biased toward the paper supply roller with a predetermined surface pressure. In the sheet feeding device, which includes a sheet member urging unit and feeds a sheet from between the sheet feeding roller and the sheet member by rotation of the sheet feeding roller, the sheet member is moved in the sheet conveyance direction by a force derived from the rotation of the sheet feeding roller. By swinging back and forth, the surface angle of the surface member is variable.

  With the above-described configuration, the paper feed roller feeds the paper from between the paper feed roller and the suction member by rotation in a state where the paper feed roller contacts the uppermost paper surface of the paper bundle with the paper feed pressure set by the paper feed pressure adjusting means. At this time, if the sheets are overlapped, the lower sheet that is in sliding contact with the lower sheet at a predetermined pressing pressure causes the lower sheet to stay with the frictional force on the sliding surface, so that only the upper sheet that contacts the sheet feeding roller is retained. Is fed by the frictional force of the paper feed roller.

  The causes of the idle feed and double feed of the paper include the paper feed pressure at which the paper feed roller presses the paper, the paper pressure at which the paper member presses the paper between the paper feed rollers, and the sliding between the paper surface of the paper and the paper member. There is a misalignment adjustment of the contact angle with the contact surface, idle feeding mainly occurs on thick paper, and double feeding mainly occurs on thin paper.

  Therefore, the set value of the paper feed pressure is adjusted according to the paper quality and type of the paper. When the paper is idled using a thick paper, the paper feed pressure is adjusted by the paper feed pressure adjusting means to increase the friction force between the paper feed roller and the paper.

  As the sheet feeding pressure increases, the sheet passes between the sheet feeding roller and the separating member in a state where the frictional force between the sliding contact surfaces of the sheet feeding roller and the separating member increases. The force that pushes the paper member in the paper transport direction, that is, the force that acts on the paper member due to the rotation of the paper feed roller becomes stronger, and the paper member moves in the paper transport direction against the biasing force of the paper member biasing means. Oscillates forward to reduce the angle.

  By reducing the sheet angle by the increase in the sheet feeding pressure for the sheet and the increase in the force acting on the sheet member due to the rotation of the sheet feeding roller, the sheet fed by the sheet feeding roller is prevented from being idly fed.

  When double feeding of paper occurs using thin paper, the paper feed pressure is adjusted to be small by the paper feed pressure adjusting means to reduce the frictional force between the paper feed roller and the paper. As the sheet feeding pressure decreases, the sheet passes between the sheet feeding roller and the buckling member in a state where the frictional force between the sliding contact surfaces of the sheet feeding roller and the sheeting member is reduced. The force that pushes the sheet member in the sheet conveyance direction, that is, the force that acts on the sheet member due to the rotation of the paper feed roller is weakened, and the sheet member that receives the urging force of the sheet member urging means moves backward in the sheet conveyance direction. Oscillates to increase the Sabaki angle.

  The sheet angle is increased by the decrease in the sheet feeding pressure with respect to the sheet and the decrease in the force acting on the sheet member due to the rotation of the sheet feeding roller, thereby preventing the sheets fed by the sheet feeding roller from being double fed.

  In the paper feeding device according to the second aspect of the present invention, the buckling member biasing means biases the buckling member in a predetermined range so as to be swingable, and biases the buckling member in a direction in which the buckling angle increases. It has a 1st elastic member and a 2nd elastic member which urges | biases a buckling member and a supporting member toward a paper feed roller.

  With the above-described configuration, the paper feed roller is slidably contacted with the power supply member by the paper feed pressure set by the paper feed pressure adjusting means, and the paper member is slidably contacted with the paper feed roller by the pressure generated by the biasing force of the second elastic member. 1 The elastic member becomes a biasing force that swings the Sabaki member backward in the sheet conveyance direction, and the sheet feeding roller that slides against the sliding surface of the Sabaki member and the sheet pushes the Sabaki member in the sheet conveyance direction. Cause it to occur.

  Therefore, when the force that pushes the sheet member in the sheet conveyance direction by sliding of the sheet feeding roller and the sheet is larger than the urging force by the first elastic member, the sheet member swings backward in the sheet conveyance direction and the sheet angle decreases. Become.

  In addition, when the force that pushes the sheet member in the sheet conveyance direction due to the sliding of the sheet feeding roller and the sheet is smaller than the urging force by the first elastic member, the sheet member swings forward in the sheet conveyance direction to increase the sheet angle. Become.

According to a third aspect of the present invention, a plurality of paper feed rollers are arranged on the same axis, and a sucker member is in sliding contact with at least one paper feed roller.
According to a fourth aspect of the present invention, there is provided a paper feeding device according to the present invention in which a plurality of paper feeding rollers arranged at the front and rear positions in the paper transport direction are arranged separately on a pair of shafts, and the at least one paper feeding roller is provided with a buckling member. It is in sliding contact.

  As described above, according to the present invention, when the set value of the paper feed pressure is increased, the frictional force between the paper feed roller and the paper is increased, and the suction member is moved in the paper transport direction by sliding of the paper feed roller and the paper. The pushing force becomes stronger and the Sabaki member swings in the direction where the Sabaki angle becomes smaller, so that it is possible to prevent pre-feeding.If the setting value of the feeding pressure is reduced, the frictional force between the feeding roller and the paper decreases, The feed roller and the paper slide to weaken the force that pushes the paper member in the paper transport direction, and the paper member swings in the direction in which the paper angle increases, preventing double feed and adjusting the paper feed pressure. The angle of the Sabaki member can be automatically adjusted by a simple mechanism, and the paper can be separated one by one according to the quality and thickness of the paper. Improved and Location is the sheet feeding device without increasing the size of.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, the basic configuration of the sheet feeding device is the same as that described above with reference to FIGS.

  In FIG. 1, a paper dust device 51 is provided to face the paper feed roller 7 located at the center of the three paper feed rollers 7 arranged coaxially with the drive shaft 6, and a stud 52 is provided in the main casing 1. It is fixedly attached to. The stud 52 is provided with a narrow plate-like movable bar 53 that forms a part of the buckling member urging means so as to be movable in and out in the radial direction of the paper feed roller 7, and a buckling pressure adjusting bar 54 is disposed. A buckling member 55 is attached to the tip of the movable bar 53.

  As shown in FIG. 3, the surface member 55 includes a base portion 56 that fits a movable bar 53 that forms a support member, and a resin-made surface plate 58 that is attached to the top portion 57 of the base portion 56. 7 has a sliding surface that is in sliding contact with the sheet 7, and is inclined with respect to the sheet surface of the sheet 25 at a predetermined angle. The movable bar 53 has a tip formed in a circular arc shape in a cross section and is fitted in a concave groove 59 in a circular arc cross section formed in the back surface of the top portion 57 to hold the buckling member 55 swingably forward and backward in the conveyance direction of the paper 25. Thus, the separator member 55 swings within a predetermined range of the separator angle.

  Between the top portion 57 of the saw blade member 55 and the movable bar 53, a first spring 60 is provided as a first elastic member that biases the saw blade member 55 in a direction in which the saw blade angle increases. Between the movable bar 53 and the movable bar 53, an adjustment for finely adjusting the urging force of the second spring 61 and the second spring 61 that constitute the second elastic member that urges the sucker member 55 and the movable bar 53 toward the paper feed roller 7. A vessel 62 is provided. The buckling pressure adjusting bar 54 is moved out and withdrawn by a cam mechanism (not shown) incorporated in the stud 52, and the fulcrum supporting the second spring 61 is moved so that the urging force of the second spring 61 is “weak”, “standard”. ”,“ Strong ”, etc.

  Hereinafter, the operation of the above-described configuration will be described. Adjustment of the urging force of the second spring 61 by the adjuster 62 is performed in the factory, and fine adjustment is performed on site as necessary. The biasing force of the second spring 61 by the buckle pressure adjusting bar 54 is set to an appropriate value.

  At the time of use, the paper feed pressure adjusting device 10 adjusts the paper feed pressure according to the thickness, paper quality, type, etc. of the paper 25. In this state, the paper feed roller 7 that is rotationally driven by the paper feed stepping motor 9 abuts on the uppermost surface of the paper stack placed on the paper feed plate 2 under the paper feed pressure set by the paper feed pressure adjusting device 10. By the rotation, the sheet 25 is sent out from between the sheet feeding roller 7 and the sheet plate 58 of the sheet member 55.

  At this time, if the sheets 25 are overlapped, the sheet plate 58 that is in sliding contact with the lower sheet 25 with a predetermined sheet pressure causes the lower sheet 25 to be held by the frictional force on the sliding contact surface, so that it contacts the sheet feeding roller 7. Only the upper sheet 25 in contact is sent out by the frictional force of the sheet feeding roller.

If the paper 25 is idled when the thick paper 25 is used, the paper feed pressure is greatly adjusted by the paper feed pressure adjusting device 10 to increase the frictional force between the paper feed roller 7 and the paper 25.
As the sheet feeding pressure increases, the frictional force between the sliding contact surfaces of the sheet feeding roller 7 and the suction plate 58 increases, and the force resulting from the rotation of the sheet feeding roller 7, that is, the sliding of the sheet feeding roller 7 and the sheet 25. As a result, the force that pushes the sheet member 55 in the conveyance direction of the sheet 25 becomes stronger. Swing forward in the direction to reduce the Sabaki angle.

  As the sheet pressure is decreased in accordance with the increase in the sheet feeding pressure with respect to the sheet 25 and the increase in the force derived from the rotation of the sheet feeding roller 7, the sheet 25 fed out by the sheet feeding roller 7 is prevented from being fed in the idle state.

  When double feeding of the paper 25 occurs using the thin paper 25, the paper feed pressure is adjusted to be small by the paper feed pressure adjusting device 10 to reduce the frictional force between the paper feed roller 7 and the paper 25. By reducing the sheet feeding pressure, the frictional force between the sliding contact surfaces of the sheet feeding roller 7 and the suction plate 58 is reduced, and the force derived from the rotation of the sheet feeding roller 7, that is, the sliding of the sheet feeding roller 7 and the sheet 25. As a result, the force that pushes the separating member 55 in the conveying direction of the sheet 25 becomes weak, and when this force becomes smaller than the urging force by the first spring 60, the urging member 55 that receives the urging force of the first spring 60 moves in the conveying direction of the sheet 25. Swinging backward increases the Sabaki angle.

  The sheet angle is increased in accordance with the decrease in the sheet feeding pressure with respect to the sheet 25 and the decrease in the force resulting from the rotation of the sheet feeding roller 7, thereby preventing the sheet 25 fed by the sheet feeding roller 7 from being double fed.

  The surface angle of the surface member 55 is determined within a predetermined range by a position where the force that pushes the surface member 55 in the conveying direction of the paper 25 by the sliding of the paper feed roller 7 and the paper 25 and the urging force of the first spring 60 are balanced. . If idle feed or double feed occurs even if the above operation is performed, the spring pressure adjusting bar 54 is operated to adjust the urging force of the second spring 61 to change the setting of the spring pressure.

  FIG. 4 shows another embodiment of the present invention, and a plurality of paper feed rollers 7 can be arranged at front and rear positions in the conveyance direction of the paper 25, and a plurality of paper feed rollers 7 are paired. Are arranged separately on the axis of the drive shaft 6. In this configuration, the surface plate 58 of the surface member 55 is slidably in contact with at least one paper feed roller 7 positioned in the front of the paper 25 in the conveyance direction. The effect is the same as that of the previous embodiment, and the description thereof is omitted.

The side view which shows the paper dust device in embodiment of this invention Side view showing the operation of the paper sheet machine Sectional view showing the rust member of the paper rust device The side view which shows the paper dust device in other embodiment of this invention Side view of a conventional paper dust device Side view of a conventional paper dust device Enlarged view showing the main parts of the paper feeder Perspective view of the paper feeder Explanatory drawing showing the procedure for setting paper in the paper feeder

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body casing 2 Paper feed plate 3 Paper feed tray 4 Elevator motor 5 Drive mechanism 6 Drive shaft 7 Paper feed roller 8 Timing belt 9 Paper feed stepping motor 10 Paper feed pressure adjustment device 11 Shaft support arm 12 Paper feed pressure adjustment spring 13 Paper feed Pressure adjusting lever 13 Operation unit 23 Paper presence sensor 24 Actuator 25 Paper 26 Paper feed guide lock lever 27 Paper feed guide 28 Timing roller 29 Guide roller 30 Press roller 31 Drum 32 Paper feed cam 33 Cam follow 34, 35 Link 36 Timing segment 37 rack 38 pinion gear 39 link fulcrum 40 fulcrum adjusting plate 51 paper punching device 52 stud 53 movable bar 54 sucking pressure adjusting bar 55 sucking member 56 base 57 top 58 sucking plate 59 recessed groove 60 first slot Ring 61 second spring 62 regulator

Claims (4)

A sheet feed roller that contacts the uppermost sheet surface of the sheet bundle, a sheet feed pressure adjusting unit that sets a sheet feed pressure of the sheet feed roller with respect to the sheet, and a sliding contact surface that slides on the sheet feed roller with respect to the sheet surface of the sheet. A sheet member arranged to be inclined at a sheet angle, and a sheet member urging unit that urges the sheet member toward the sheet feeding roller with a predetermined sheet pressure, and rotates the sheet feeding roller to feed the sheet to the sheet feeding roller. In the paper feeding device that feeds through between the paper member, the paper member is oscillated back and forth in the paper transport direction by a force derived from the rotation of the paper feed roller, and the paper member angle changes. apparatus. The buckling member urging means feeds the supporting member that swings the sawing member within a predetermined range, the first elastic member that biases the sawing member in the direction in which the sawing angle increases, the feeding member and the supporting member. The sheet feeding device according to claim 1, further comprising a second elastic member biased toward the paper roller. The sheet feeding device according to claim 1, wherein a plurality of sheet feeding rollers are arranged on the same axis, and a sucker member is in sliding contact with at least one sheet feeding roller. The plurality of paper feed rollers arranged at the front and rear positions in the paper transport direction are arranged separately on a pair of shafts, and the sucker member is in sliding contact with at least one paper feed roller. The paper feeder described.

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