JPH0724832U - Automatic paper feeder - Google Patents

Abstract

(57) [Abstract] [Purpose] In an automatic paper feeder of the bottom surface separation type, when the sheets are stacked and stored on the mounting table, the locking state may be released due to vibration or erroneous operation of the sheet urging mechanism. It is an object to provide a non-automatic paper feeder. [Structure] An automatic paper feeder 1 includes a placing table 3 on which stacked sheets are placed, and a sheet urging mechanism for pressing the laminated sheets placed on the placing table 3 toward the placing table 3 at a sheet pressing urging position. 12 and the calling roller 10 that sequentially feeds the lowermost sheet of the stacked sheets placed on the placing table 3, and the surface of the sheet fed by the calling roller 10 is brought into sliding contact with only a predetermined sheet of paper. Paper separation mechanism 40 for separating and feeding the paper to the printer 80 side
And are equipped with. The sheet biasing mechanism 12 is held and released by the operating piece 30 at a position separated from the sheet pressing biasing position.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automatic paper feeder which is attached to a paper processing device such as a printer and supplies paper to a portion (paper processing unit) where paper is processed such as printing.

[0002]

[Prior art]

 Generally, a printer incorporates a paper feed cassette in which various papers are stacked and stored in the printer body. The stacked papers are separated one by one by a separation mechanism provided in the paper supply cassette and printed by a paper conveyance mechanism. Transported to the department. Some of such printers are equipped with an automatic paper feeder so that printing is performed on paper other than the paper stored in the paper feed cassette.

In Japanese Patent Application No. 4-20692, which is a prior art, the uppermost surface of the sheets stacked on the mounting table is pressed by a sheet urging mechanism, and the lowermost sheet is sequentially fed to the printer side by a calling roller. An example of a bottom surface separation type automatic paper feeder is described. The paper urging mechanism of this automatic paper feeder is rotatably attached to the frame of the main body of the apparatus, and has a pair of support arms provided with weight rollers at the tip. The pair of support arms are provided with an actuating rod extending laterally on the base end side thereof, and are urged to rotate toward the mounting table by a tension spring attached to the actuating rod.

When the sheets are stacked on the mounting table, the pair of support arms are rotated against the biasing force of the tension springs. At this time, the actuating rod is adapted to be engaged with the holding portion provided in the main body of the apparatus, and the pair of support arms equipped with the weight rollers are held in an upright state. Then, after stacking the sheets on the stacking table, the pair of support arms are moved toward the stacking table on which the sheets are stacked to release the locking state between the actuation rod and the sandwiching section, and the weight roller is Contact the top surface of the laminated paper.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention As described above, the pair of support arms are held in an upright state by the actuation rod being locked to the holding portion. At this time, since the pair of support arms are in an upright and inclined state and are urged to rotate toward the mounting table by the tension springs, the locked state can be easily caused by vibration or erroneous operation. There are problems such as the risk of being caught when the paper is set, and the paper is damaged due to the weight of the weight roller when the paper is set.

The present invention has been made to solve the above-mentioned problems, and in an automatic paper feeder of the bottom surface separation type, when the sheets are stacked and accommodated on the placing table, the sheet urging mechanism vibrates and is erroneously operated. It is an object of the present invention to provide an automatic paper feeding device in which the locked state is not released by the above.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the automatic paper feeder of the present invention has a mounting table on which a plurality of sheets can be mounted and a plurality of sheets mounted on the mounting table at a sheet pressing bias position. A paper urging mechanism that can be pressed in the direction of the table, a paper feed mechanism that sequentially feeds the lowermost paper of the plurality of sheets placed on the table, and a paper feed mechanism And a paper separating mechanism for slidingly contacting a surface of the fed paper and separating only a predetermined paper and feeding the paper to the paper processing apparatus. The paper urging mechanism is provided from the paper pressing urging position. Holding means for holding apart and an operating piece for releasing the state held by the holding means are provided, and holding and releasing of the paper urging mechanism are performed by swinging the operating piece. Interlocked with the swinging of one side, the paper separating mechanism Is characterized in that al is separable.

[0008]

[Action]

 According to the automatic paper feeder of the present invention, the laminated paper placed on the placing table is pressed by the paper urging mechanism. This paper urging mechanism is configured to be held by a holding means at a position separated from the paper pressing urging position, and the paper urging mechanism in the state of being held by this holding means is an operating piece. It is canceled by operating.

[0009]

【Example】

 Hereinafter, one embodiment of the automatic sheet feeder according to the present invention will be specifically described with reference to the accompanying drawings. The automatic paper feeder 1 is configured to be attached to and detached from the printer 80 shown in FIG. 1, for example. The structure of this printer will be briefly described. A printer 80 is provided with a printer 81 having a developing device 81a and a photosensitive drum 81b for printing on paper. Below the printer 81, a paper cassette 82 is provided. Is incorporated. This paper feed cassette 82 is provided with a mounting plate 83 and a mounting plate 83 for stacking and stacking B5 size papers, for example, and urges the stacking plates 83 upward to bring the stacked papers into contact with the paper feed roller 85. It has a bias spring 86. The paper sheets fed out one by one by the paper feed roller 85 are transferred through the pair of transport rollers 87, the guide 88, the paper guide valve 89, the pair of transport rollers 90, and the guide 91 provided on the downstream side of the paper feed cassette 82. It is conveyed to the printing unit 81. Then, the paper printed by the printing unit 81 is transferred onto the paper output stacker 95 of the printer through the fixing roller pair 92, the discharge guide 93, and the discharge roller pair 94 which are provided on the downstream side of the printing unit 81. Is discharged.

The automatic paper feeder 1 is configured to be mounted on a manual insertion port (not shown) provided on the printer 80, and is fed from the automatic paper feeder mounted on the printer. The sheet is conveyed from the manual feed port toward the printing unit 81 via the sheet guide valve 89.

FIG. 2 is an enlarged partial sectional view of the automatic paper feeder 1 shown in FIG. 1, and FIG. 4 is a view of the automatic paper feeder as seen from above. A frame 20 of the automatic paper feeder 1 is a support table 3 on which an arbitrary sheet is placed, and a paper support that is rotatable with respect to the frame 20 and supports the rear end side of the stacked sheets placed on the platform 3. Even a member 5 is provided. A call roller 10 driven by a drive source (not shown) is rotatably supported on the frame 20, and the sheets stacked on the loading table 3 have a lowermost surface on the front end side of the call roller 10. It comes into contact with the surface. The mounting table 3 is provided with a pair of guide plates 7 slidably in the width direction of the laminated paper so as to define both edges of the laminated paper. The sheets stacked on the loading table 3 are abutted at their front end faces to the stoppers 21 provided on the frame 20 according to the angle of the loading table 3, and the sheet urging mechanism 12 moves the lowermost sheet to the calling roller 10. Pressed. Thus, by driving the ejecting roller 10, the lowermost sheet is fed to the sheet separating mechanism 40 described later via the gap of the stopper 21.

The paper urging mechanism 12 is provided with a pair of arms 25 whose base ends are rotatably supported in a pair of arm shaft support portions 23 provided on the frame 20, It is freely rotatable within the range. Pins 25a are provided in the middle of each arm 25, and these pins 25a slide in a groove 20d formed in the frame 20 in an arc shape, so that the pair of arms 25 can rotate. Are limited within the required range. A weight support member 27 that supports the weight roller 26 is laterally provided on the tip ends of the pair of arms 25. At the center of the weight support member 27, there is provided an L-shaped locking member 28 having a protruding portion 28a bent toward the printer. A pair of arms 25 is shown by a chain double-dashed line in the figure. As described above, when the sheet 28 is lifted away from the sheet pressing bias position, the projecting portion 28a is locked by the operating piece 30 described below.

At the center of the upper surface 20a of the frame 20, there is provided an operating piece 30 which is biased in the A direction about the fulcrum 30a and is swingable in the B direction. A locking portion 30b engageable with the protruding portion 28a and a claw 30c to be fitted into a rectangular hole of a support member described later are integrally formed on the member 30. This operating piece 30 is normally in a state of vertically projecting as shown by the solid line, and when the pair of arms 25 supporting the weight roller 26 is lifted as shown by the chain double-dashed line in the figure. After the projecting portion 28a repels the locking portion 30b to swing the actuating piece 30, the projecting portion 28a is locked by the locking portion 30b. FIG. 3 shows a state in which the paper-pushing mechanism 12 is held apart from the paper-pressing and biasing position by the protrusion 28a being locked by the locking portion 30b.

The above-described sheet separating mechanism 40 has a function of surely separating the plurality of sheets fed out by the calling roller 10 into one sheet when the plurality of sheets are fed out by the calling roller 10. And a separation roller 16 which is arranged so as to be in contact with and separated from the conveyance roller 15 and a conveyance roller 15 which are driven by a drive source (not shown). The separating roller 16 is in a state of being connected to the above-mentioned operating piece 30 so that when a jam or the like occurs, it can be easily treated. The structure of the separation roller 16 will be described below with reference to FIG.

The separation roller 16 is rotatably attached to the roller shaft 43, and a spring 47 is disposed on one end side in the axial direction of the separation roller 16 with a friction member 45 and a washer 46 interposed therebetween. Are fixed by a retaining ring 49 with a washer 48 interposed. Therefore, in the separation roller 16, a predetermined load torque is applied to the roller shaft 43 by the pair of friction members 45 urged by the spring 47. The separation roller 16 is rotated along with the driving of the conveyance roller that is in contact with the separation roller 16, and the spring 47 is a force that prevents the movement of the sheet due to the frictional force between the conveyance roller and the sheet> the load torque. > Friction force between papers is set.

The roller shaft 43 to which the separation roller 16 is attached is supported by the support member 50. The support member 50 is integrally formed by a U-shaped member 51 and a protruding member 56 protruding from the upper surface 52 of the U-shaped member 51. Fitting grooves 53, into which the roller shafts 43 are fitted and supported, are formed at the tips of both extending portions of the U-shaped member 51, and on the upper surface 52, as shown in FIG. A hole 55 is formed in which the sliding rod 20b extending downward from the upper surface 20a of the frame 20 is inserted. Further, as shown in FIG. 2, the projecting member 56 is formed with a rectangular hole 57 projecting from the upper surface 20a of the frame 20 and into which the claw 30c of the operating piece 30 is fitted.

The support member 50 supporting the roller shaft 43 is arranged between a pair of sliding contact plates 20 c extending downward from the upper surface 20 a of the frame, and the sliding rod 20 b is inserted into the hole 55. And is supported by the claw 30c of the operating piece 30. Further, a biasing spring 60 is arranged between the upper surface 20a of the frame and the upper surface 52 of the U-shaped member so as to wind the sliding rod 20b, and the supporting member 50, that is, the separation roller 16 is conveyed. It is biased toward the roller 15. With this configuration, the support member 50 is lifted against the biasing force of the biasing spring 60 when the operating piece 30 is swung in the B direction, and the separation roller 16 is separated from the transport roller 15 ( (See FIG. 3).

Next, the operation of this automatic paper feeder will be described. As shown in FIG. 2, after all the sheets stacked on the mounting table 3 have been fed out, the pair of arms 25 is lifted up to the upper surface 20a of the frame as shown by the chain double-dashed line in the figure. Then, the protruding portion 28a of the locking member 28 provided in the central portion of the weight supporting member 27 repels the locking portion 30b of the operating piece 30 to swing the operating piece 30 in the B direction, and then the protruding portion 28a is in a state of being locked by the locking portion 30b. FIG. 3 shows a state in which the sheet urging mechanism 12 is held apart from the sheet pressing urging position by the protrusion 28a being locked by the locking portion 30b. In this case, since the operating piece 30 is swung, the separation roller 16 is separated from the transport roller 15. In the state shown in FIG. 3, new sheets are stacked on the mounting table 3.

As described above, by providing the operating piece 30 urged toward the sheet urging mechanism side about the fulcrum 30a and locking the sheet urging mechanism 12 to the operating piece 30, the vibration of the sheet urging mechanism is caused. It is possible to prevent unlocking due to erroneous operation. Further, as in the above-mentioned prior art, the structure is not such that the pair of arms 25 is erected and held, but the position where the pair of arms is lifted to the minimum required by the operating piece 30 (in this embodiment, Since it can be held at the position corresponding to the upper surface of the automatic paper feeder), it is possible to eliminate the moving space of the paper urging mechanism. Then, by swinging the operating piece 30 to release the locked state between the projecting portion 28a and the locking portion 30b, the sheet urging mechanism 12 returns to the stacking sheet pressing urging position.

Further, when a jam occurs in the state shown in FIG. 2, the separation roller 16 can be separated from the conveyance roller 15 by swinging the operating piece 30 in the B direction. For this reason, it is possible to perform the jam processing with a simple operation without lifting the paper urging mechanism 12.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments and can be variously modified. For example, the sheet urging mechanism that applies a pressing load to the sheet can be variously modified, and the position where the operating piece is provided can be changed as appropriate.

[0022]

[Effect of device]

 As described above, according to the automatic paper feeder of the present invention, it is possible to reliably release and hold the paper urging mechanism when exchanging paper or replenishing paper. For example, the held paper urging mechanism is not released by the above.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall outline of a case where an automatic paper feeder according to the present invention is attached to a printer body.

FIG. 2 is a partial cross-sectional view showing an enlarged view of the automatic paper feeder shown in FIG.

FIG. 3 is a view showing a state in which a paper urging mechanism of the automatic paper feeding device shown in FIG. 2 is lifted.

FIG. 4 is a view of the automatic paper feeding device as viewed from above.

FIG. 5 is a diagram showing a configuration of a separation roller.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Automatic paper feeding device, 3 ... Loading table, 12 ... Paper urging mechanism,
10 ... calling roller, 20 ... frame, 25 ... arm,
26 ... Weight roller, 30 ... Operating piece, 40 ... Paper separating mechanism, 80 ... Printer (paper processing device).

Claims (1)

[Scope of utility model registration request] 1. An automatic paper feeding device for separating and feeding laminated paper sheets to a paper processing device, comprising: a placing table on which a plurality of sheets can be placed; and a plurality of sheets placed on the placing table. A paper urging mechanism capable of pressing in the paper urging position toward the mounting table, and a paper feeding mechanism for sequentially feeding the lowermost sheet of the plurality of sheets mounted on the mounting table. A sheet separating mechanism that slides on a surface of the sheet fed by the sheet feeding mechanism, separates only a predetermined sheet and feeds the sheet to the sheet processing apparatus, and the sheet urging mechanism includes: A holding means for holding the sheet urging position apart from the sheet urging position and an operating piece for releasing the state held by the holding means are provided, and the sheet urging mechanism is held.
The release is performed by swinging the operating piece, and in association with the swinging of the operating piece, the paper separating mechanism can be separated from the surface of the fed paper. Paper feeder.