JPS62244822A - Feeder for printer - Google Patents

Abstract

PURPOSE:To make it possible to stably supply sheets in a feeder in a cut-sheet feeder type printer, by providing such as arrangement that a feed roller makes always in contact with the sheets on a press plate at a predetermined position irrespective of the amount of sheets loaded thereon. CONSTITUTION:A given umber of sheets 50 are loaded on a press plate 43 and aligned so that the leading end of the sheets 50 abuts against a separating pawl 45A, and then the press plate 43 is inclined and is held in a condition in which the sheets 50 may be fed. A feed roller 20 makes into contact with the upper surface of the sheets 50, and releases the sheets 50 one by one from the the separating pawls 45 so that the sheets are successively fed. Further, the press plate 43 is arranged such that it is movable in the direction orthogonal to the axis of the feed roller 20, and therefore, it may be moved always in a predetermined direction tangential to the feed roller 20. Further, when no sheets are fed, a predetermined gap is held between the feed roller 20 and the upper surface of the sheets 50 on the press plate 43.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a printer feeding device, and more particularly to a cut sheet feeder type printer feeding device that automatically feeds cut sheets and the like.

(Prior art) In most conventional printers, the above-mentioned cut sheet feeder is optionally attached to the top of the printer, or a cassette loaded with sheets, such as parent sheets for printing, is inserted into the printer and fed. A method is adopted in which the information is transmitted.

However, in the conventional printer feeding device using the above-mentioned method, it is troublesome to attach and detach it, and it is not only expensive because it requires a large number of parts for the mechanism and exterior in addition to the printer itself. , the operability is also not good.

An example of a conventional feeding device is shown in FIG. 78 to FIG. 7C.
Here, reference numeral 101 denotes a paper holding pressure plate that is rotatably supported around a rotation shaft 102 and keeps the accumulated printing paper 103 biased toward the paper feed roller 104.

The accumulated printing paper 103 is held in the canopy so that it can be pulled out in the paper feeding direction indicated by the arrow by the leading edge of the paper feed roller 104 by the claw +05. ! ``The printing paper 103 located on the upper support layer can be sent out by rotating it around the edges.

However, in such a feeding device, rotation and I'
The relative position between +l+io2 and the paper feed roller 104 is determined, and when the thickness of the printing paper 103 held as shown in Fig. Since it is set so that the printing paper 103 is kept almost horizontally, immediately after the printing paper 103 is fully loaded as shown in Fig. 78, the pressing point F of the printing paper 103 by the paper feed roller 104 is as shown in Fig. 7B. 7C, the tip of the pressure plate 101 is at the rear of the pressure surface 1048 of the paper feed roller 104 compared to the pressure point F2, and in the state shown in FIG. Since the pressing point F3 is inclined upward, the pressing point F3 is the pressing point F mentioned above.
2, it comes to the front of the pressing surface 1048.

Moreover, since the feeding direction of the printing paper 103 changes, the feeding state of the printing paper 103 immediately after separation from the cutting claw 105 becomes unstable. Also, the pressure plate rotating shaft 102 is connected to the paper feed roller 1.
If the printer is not moved as much as possible relative to the 04 axis, the above-mentioned tendency will become significant, so if the distance between them is maintained, the shape of the pressure plate becomes larger, which has the disadvantage of making the printer as a whole bulkier. .

[Problem that the invention seeks to solve]

An object of the present invention is to focus on the above-mentioned problems, and to solve the problems, the feeding rotary body always contacts the sheets on the pressure plate at a predetermined position regardless of the amount of sheets loaded.
Moreover, it is an object of the present invention to provide a highly reliable printer feeding device that can keep the sheet feeding direction constant and perform stable and accurate feeding.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a pressure plate that loads aligned sheets, biases the sheets toward the splitting claw, and keeps the sheets ready for feeding. In a printer feeding device, which has a feeding rotary body that presses against the upper surface of the sheet and releases the sheets one by one from the gongs and feeds them, the pressure plate is placed against the feeding rotary body with its 1111 center. It is characterized by being able to move freely in the right angle direction.

(Function) In the printer feeding device configured as described above, the pressure plate is always maintained in a constant tangential direction with respect to the feeding rotating body, and the pressure plate is moved in a direction perpendicular to its surface. The sheet stacking mechanism is configured such that a predetermined distance is maintained between the feeding rotary body and the top surface of the sheets held on the pressure plate when sheets are not being fed. It is possible to carry out stable and reliable sheet feeding regardless of the condition.

[Examples] Examples of the present invention will be described below in detail and specifically based on the drawings.

FIG. 1 shows an embodiment of the invention. Here, 1 is a board, and a guide shaft 3A that slidably supports the carrier 2 by the bent left side plate 18 and right side plate 1B on both sides thereof.
and 3B are pivotally supported. The carrier 2 is driven along the guide shafts 3A and 3B by a carrier motor and driving means (not shown), but the carrier 2 is equipped with a print head, for example, an inkjet head 4, and the print head 4 is provided with a print head such as an ink jet head 4. By supplying a recording signal to each nozzle, ink can be ejected from the nozzle to perform recording. 5 is an ink tank.

6 is rubber etc.ff? A sheet feed roller made of a material with a high coefficient of friction, 6A is its roller shaft, and roller i6
A is an operating member 8 that holds the thorn-shaped paper pants and is equipped with an operating lever 88 and a locking protrusion 8B for releasing a pinch roller (not shown) from the roller 6.
is rotatably fitted. Further, 9 is a gear for driving the sheet feed roller 6, and is composed of a large gear 98 and a small gear 9B, of which the small gear 9B meshes with an idle gear 1O, and the idle gear 1O is connected to the discharge roller shaft 11A. It meshes with a drive gear 12 provided in the. Therefore, as will be described later, the swing lever member is moved by the sheet feed motor 13! When the sheet feed roller 6 is driven through the gear 9, the discharge roller ll1Ih118 is rotated through the gear 9.

Reference numeral 11 denotes a discharge roller installed at a predetermined position on the output roller shaft 11^, which is made of a material with a large friction coefficient such as rubber. An engaging groove n is provided around the periphery. 15 is a gear-shaped discharge spur 1 attached to these discharge rollers 11.
6^ and a spur holder holding the sheet presser spur 1611 in a contactable manner; 17 supports the spur boulder 15;
58, the support member 1
7 is attached to a frame-shaped spur biasing lever 18, and by biasing the spur biasing lever 18 toward the locking protrusion 8B of the operating member 8 by a spring (not shown), the spur holder 15 is attached.
The discharge spur 168 and the sheet presser spur 16B provided in the paper discharge roller 11 can be kept in contact with the paper discharge roller 11.

Reference numeral 20 denotes a feeding roller made of rubber or the like and having a small-diameter circumferential surface portion 20^ and a large-diameter circumferential surface portion 20B.The feeding roller 20 is fixed to a feeding roller base 21.
Furthermore, collar portions 218 and 21B are formed. The feed roller 20 and its base body 21 are slidably fitted to the feed roller @23 on both the left and right sides.
By giving the feed roller shaft 23 a 0-shaped cross section,
The diagnosis is made by rotating the feed roller 20 and the base body 21 together with the roller shaft 23.

The feed roller @23 is supported by the side plates IA and 1B, and the timing gear 2 is attached to one end of the feeding roller @23.
4 is installed. This timing gear 24 includes an external gear part 25 having an external tooth part 258 and a toothless part 25[l at the center thereof, and an internal tooth part 26A provided along the outer circumferential part.
and an internal gear part 26 having a tooth-missing part 26B, and a space part 248 is interposed between the external gear part 25 and the internal gear part 26.

Then, the feeding roller is passed through this timing gear 24!
Shift roller again on Tlh23! Switching to Tjlh6^, the sheet feeding motor 13 is attached to a motor board IC fixed to the side plate l^ so as to maintain a predetermined distance, and a trigger device 27 is further fixed to this board IC. . Therefore, the motor 13 causes the l
The idle gear 1411 provided on the swing lever member 14 can be rotated via the pinion gear (not shown) attached to the swing lever 'I+b I4^. Note that here, the swing lever member 14 is rotatably supported by the swing lever llll1b148.

31 and ko2 are a swing gear and a sheet feed gear supported on the upper and lower wings of the swing lever member 14, respectively. 32 is provided with a large gear 32A and a small gear 32B, and the respective large gears 318 and 328 mesh with the idle mountain @1411. 33 is an engagement member attached to the lever member 14, and 34 is an elastic friction piece.

Furthermore, the trigger device 27 is rotated by 'T+k :l s eight)' r old yTc large h,
P /7'l 4E 5tsu l-(f, 11
-7. /7 1'ill k: IB-formed trigger lever 35, plunger 36 that operates the trigger lever 35, trigger solenoid 37, and return spring 38
It is composed of

408 and 40B are left and right slider units, respectively, which are slidably held on the unit guide shaft 41. Also, information! The TIIk41 is supported by the side plates IA and IB, and a long groove 41A is formed in the ll1Ib41 along the axis. Reference numeral 42 denotes a feeding lever attached to the end of the guide shaft 41. During feeding, the sheet can be fed onto the pressure plate 43 by tilting the lever 42 in the direction of arrow A.

Next, the configuration of the slider units 40A and 401) will be explained in detail with reference to FIG. In addition, units 408 and 40
8 and is configured symmetrically. Here, 44 is the slider body, 44A is its knob, and 44B is the main body 44^.
1I1141 is a guide hole that is slidably supported; 1I4G is a guide tube that is erected from the bottom and into which the guide column 43^ of the pressure plate 43 is slidably fitted; 440 is a lock claw 4 of the pressure plate 43;
3B is the engagement square hole that locks it, 44E is the feed roller base 2
This is a pivot point that pivots between the flange portions 218 and 21B of 1. Reference numeral 45 denotes a separation claw holding member having a separation claw 45A at its tip, which is rotatably attached to the slider body 44 via a shaft pin 45B, and its clockwise rotational movement is caused by the separation claw holding member 45. The stopper portion 45C at the upper end contacts the flange portion 21B of the feeding roller base 21 from below, thereby being regulated.

46 holds the pressure plate 43 and guides the guide shaft 4 by the feeding lever 42.
This is a set arm member that can swing the pressure plate 43 up and down in response to the rotational movement of the member 45. For this purpose, the shaft hole of the member 45 is provided with a rotation stop protrusion 4 that engages with the long groove 418 of the guide shaft 41.
6A is formed. Further, the hook-shaped arm portion 46B of the member 46 is engaged with an engagement hole 43C (see FIG. 3) on the back side of the pressure plate 43 (not shown in this figure) so as to be able to slide up and down.

Furthermore, in FIG. 2, 47 is a pressure plate spring that holds the pressure plate 43 in a lifted state, and 48 is a friction plate attached to the upper surface of the pressure plate 43. The friction plate 48 is made of a material with a relatively low friction coefficient, such as cork or felt. Made of large material.

Next, various operations from setting sheets to discharging sheets in the printer configured as described above will be explained with reference to the respective figures.

First, when setting sheets on the slider units 40^ and 40B, manually turn the feeding lever 42 shown in FIG. set arm member 46 and the third set arm member 46
The pressure plate 4 is engaged through the engagement hole 43C as shown in the figure.
3 against the spring force of the spring 47, the lock claw 4311 of the pressure plate 43 can be locked in the engagement square hole 114tl provided at the bottom of the slider body 44 as shown in FIG. 3D.

Therefore, here, the required number of sheets are cumulatively loaded on the pressure plate 43, aligned so that the leading ends of the sheets abut against the separating claws 45^, and then the feeding lever 42 is moved in the opposite direction to the direction of the arrow A. When the locking claw 43B is rotated to release the engaged state and the pressure plate 43 is biased upward by the spring force of the spring 47, the stopper portion 45G of the separation claw holding member 45 moves against the collar of the feeding roller base 21. Sheets can be set on the slider unit while maintaining a predetermined gap between the sheet and the roller 20.

Next, the operation of feeding the sheet held by the sheet feeding roller 6 will be described. In a normal state, as shown in FIG. 48, the engaging portion 33 of the swing lever member 14 is engaged by the trigger lever 35. This engaged state allows the swing gear small gear 31B of the swing lever member 14 to be positioned at the missing part 251 of the external gear portion 25 of the timing gear 24. On the other hand, the small gear 32B of the sheet feeding gear 32, which is pivotally supported on the other end side of the swing lever member 14, meshes with the large gear 98 on the sheet feeding roller shaft 68 side.

Therefore, when feeding the sheet upward, that is, to the recording position, by driving the idle gear 14B of the swing lever member 14 in the direction of arrow B by the motor 13, the sheet is fed through the small gear 32 [1 and the large gear 9^]. The sheet feed roller 6 can be rotated clockwise, and in this state, the swing gear pinion 31B is rotated in the external gear section 2.
5, the timing gear 24 is not rotated.

Further, when attempting to return the seat in the opposite direction to the above, the swing lever member 14 also attempts to rotate counterclockwise due to the reverse rotation of the motor 13, but the swing lever member 14 also attempts to rotate in the counterclockwise direction due to the locking of the trigger lever 35. The rotational movement of the lever member 14 is blocked, and the sheet feed roller 6 can be reversed as it is.

Next, the operation when automatically feeding a sheet to the rollers 6 will be described with reference to FIG. In this case, first, the trigger solenoid 37 is energized to attract the plunger 36, and the trigger lever 35 is rotated clockwise to release the swing lever member 14 from the locked state.

In this state, when the motor 13 is rotated in the direction opposite to the seat, that is, the idle gear 111B is rotated counterclockwise, the swing lever member 14 is also rotated, and the timing gear 24 is rotated. As shown in FIG. 4B, the small gear 31B of the swing lever member 14 meshes with the internal tooth portion 268 of the internal gear portion 26, and also meshes with the large (Kt tun 98) on the sheet feed roller shaft 6^ side. small gear 3
2B is dissociated from the big float 98.

Therefore, the timing gear 24 rotates in the direction of arrow C as shown in FIG. 4II, and the feeding roller 20 begins to rotate via the feeding roller ll1ll123. Note that in this state, power supply to the solenoid 37 is stopped. FIG. 58 shows a state in which the feeding roller 20 begins to rotate in this manner, and as the feeding roller 20 rotates in the direction of arrow C, its large diameter circumferential surface 20B approaches the upper surface of the sheet 50. Since the sheets 50 are in contact with each other, the sheet 50 located at the top due to rI friction force
Only one card is drawn by the separation claw 45^! 11 and sent to the roller 6 side.

FIG. 5B shows a state in which the leading edge of the sheet 50 is guided between the sheet feed roller 6 and the pinch roller 51 as described above. In this state, the sheet 50 is kept in a loop shape, while the timing In the gear 24, the small gear 31B is guided to the toothless part 2B+1 of the external gear part 26 as shown in FIG. 4C, and as the timing gear 24 stops rotating, the feeding roller 6 also stops. When the feed motor 13 is rotated in the positive sheet feeding direction, the swing lever member 1 is rotated by the rotation of the idle gear 14B in the direction of arrow B.
4 in the same direction, the small gears 301 and 32
B can be brought into mesh with the external tooth 25^ of the external gear part of the timing gear 24 and the large gear 9^ on the side of the sheet feeding roller 6, and by rotating the sheet feeding roller 6, the sheet 50 can be moved to the 5th C. As shown in the figure, it can be wound between a pinch roller 51 and the like. At this time, the feeding roller 20 also rotates, but at this timing, the small diameter circumferential surface portion 20A of the feeding roller 20
Therefore, the sheet is not fed by the feeding roller 20, and the small gear 31B is in the opposite position to the internal gear part 2.
When the feeding roller 20 rotates to the toothless portion 25B of No. 6, the feeding roller 20 stops and is maintained in the state shown in FIG. 4A.

At this point, sheet feeding is even more important! If continued, sheet 5
0 is guided between the discharge roller 11 and the sheet feed spur 16B as shown in FIG.
Keep the tension on the front side of A. Therefore, in this state, printing is performed on the sheet 50 by the print head 4, and then the sheet is continuously fed again.

In this case, the feed spur 16^ and the sheet feed spur 161
1, since the spur holder 15 is supported by the support member 17 of the spur lever 18 at a position closer to the spur 16B, the spurs 168 and 1611 are biased toward the discharge roller 11 via the spur lever 15. Most of the force is applied to the sheet feed spur 16B. Therefore, in the state shown in FIG. 68, the sheet 5 is mainly moved only by the spur 16B.
0 is the discharge roller! The sheet 50 is held between the spurs 16 and 16, and there is no force strong enough to push it back due to the elasticity of the sheet 50, and the sheet 50 remains in light contact with the spur 16 along the tangential direction of the sheet 50. It's nothing more than that.

Thus, as a result of continued sheet feeding after the end of recording, when the trailing edge 50^ of the sheet 50 is fed to the position shown in FIG. 60, the trailing edge 508 is guided by the discharge spur 168. The sheet 50 falls into and is engaged with the engagement groove 11B of the discharge roller 11, and the sheet 50 is stored in the stocker 52 by the discharge roller 11 as it is.

[Effect of the invention] As explained above, according to the present invention, sheets can be stacked
Since the pressure plate to be pressed can be moved in a direction perpendicular to the axis of the feeding rotary body, the pressure position in the circumferential direction of the feeding rotary body that presses against the sheet on the pressure plate during feeding can be accumulated. Not only can the thickness of the sheet be kept constant regardless of the thickness of the sheet, but also the sheet feeding direction can be kept constant. This makes it possible to provide a highly reliable printer feeding device.

[Brief explanation of drawings]

FIG. 1 is a partially exploded perspective view showing an example of the configuration of a feeding device of a printer of the present invention, and FIG. 2 is an exploded perspective view showing a slider, which is the feeding mechanism. 38 and 3B are cross-sectional views showing the operating mode when setting the sheet of the slider, and FIG. 48, 41'1, and 4C are the operating modes of the timing gear according to the present invention. , FIG. 58, FIG. 5B, and FIG. 5C are explanatory diagrams showing the process of operation of the feeding roller. FIGS. 68 and 6B are explanatory diagrams showing the operation process of the feeding roller. FIGS. 78 to 7C are explanatory diagrams showing the feeding process in a conventional printer feeding device. 6...Sheet feed roller, 20.104...Feed roller, 20A, 20B...Surrounding surface portion, 21...Feed roller base, 42...Paper feed lever, 43.101... Pressure plate, 44...Slider body, 46...Set arm member, 50...Seat. Figure 3B Figure 4C Figure 5C

Claims (1)

[Scope of Claims] 1) A pressure plate that loads aligned sheets, biases the sheets toward a separating claw, and maintains a feedable state; In the feeding device for a printer, the pressure plate is movable relative to the feeding rotary body in a direction perpendicular to its axis, in a feeding device for a printer having a feeding rotary body that is released from the separating claw to feed the feed rotary body. Features of printer feeding device. 2) In the printer feeding device according to claim 1, the pressure plate and the feeding rotating body are arranged symmetrically with respect to the sheet feeding direction. sending device. 3) In the printer feeding device according to claim 1 or 2, the pressure plate is slidably supported on an axis of the feeding rotary body and a guide shaft parallel to the axis. a pressure plate support slidably supported on the guide shaft;
A feeding device for a printer, wherein the feeding device is movably engaged with an arm member that rotatably holds the pressure plate.