JPS62244823A - Feeder for printer - Google Patents

Abstract

PURPOSE:To make it possible to prevent the insertion of sheet onto a press plate from being hindered, in a feeder in a cut-sheet feeder type printer, by associating a separating pawl member with the depressing motion of the press plate so that a predetermined gap is held between the separating pawl and the pressing plate. CONSTITUTION:There are provided, in a feeder, a means for pulling a press plate 47 in parallel when sheets which are aligned together are loaded on the press plate 43, and a means for rotating a separating pawl member 45 about a shaft pin 45B to pull up the separating pawl 45. Accordingly, when the press plate 43 is depressed to feed sheets, a resilient arm section 61 of the press plate 43 depresses downward an extending arm section 60 of the separating pawl member 45, overcoming the force of a press plate spring 47, and therefore, the lever action of the member 45 causes the front end of the pawl separating member to be raised in the direction Y. In this arrangement, a stopper 45C on the member 45 abuts against the flange section of a feed roller base, and therefore, sufficient gaps are maintained among a separating pawl 45A and a paper sheet roller which is not shown, and the press plate 43, thereby it is possible to set a bundle of sheets without hindrance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printer feeding device, and more particularly to a printer feeding device equipped with a cut sheet feeder, that is, an automatic cut sheet feeding mechanism.

(Prior Art) In recent years, as the number of printers using cut sheets has increased, attempts have been made to attach a cut sheet feeder to the printer as an option. But in this case,
In general, it is necessary to install a powered feeder mechanism as an exterior and separate from the printer main body, which not only increases the number of parts but also increases costs, requires time and effort to install, and is connected There is a lack of reliability in some parts.

Therefore, attempts have been made to develop a printer with a built-in cut sheet feeder in order to eliminate the above-mentioned drawbacks, but this mechanism must be installed within a limited space, resulting in various inconveniences. There are many. In particular, when setting a sheet, it is difficult to visually check the state of the leading edge of the sheet held by the separation claw, and the amount of thrust of the pressure plate for setting the sheet is limited, making the setting work extremely difficult and extremely difficult. It takes time and effort.

(Problems to be Solved by the Invention) In view of the above-mentioned problems, an object of the present invention is to solve the problems and to ensure that there is enough space between the separating claw and the pressure plate when setting the sheet on the pressure plate. To provide a feeding device for a printer in which a space is maintained and sheet insertion is not hindered.

[Means for solving problems]

To achieve this objective, the present invention includes a pressure plate that loads aligned sheets, biases the sheets toward a separation claw, and keeps the sheets ready for feeding, and a separation claw at the tip of the feeding side. a separation claw member formed thereon and pivotably supported on a support of the pressure plate, means for pulling down the pressure plate in parallel when stacking aligned sheets;
It is characterized by comprising a means for pulling up the separating claw by swinging the separating claw member around the pivot 8+S in conjunction with the lowering operation of the pressure plate lowering means.

(Function) In the feeding device of the printer of the present invention, when the pressure plate is pushed down for feeding, the extended arm of the separation claw member is pressed by the elastic piece provided in the pressure plate, and the separation claw holding member The sheet is flipped up until it comes into contact with the flange of the feeding rotor base, so by keeping enough space between the pressure plate and the separating claw, the sheet can be easily inserted and set in that space. I can do it.

〔Example〕

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

FIG. 1 shows an embodiment of the invention. Here, 1 is a board, and a guide ITh that slidably supports the carrier 2 by the bent left side plate IA and right side plate IB on both sides thereof.
b3A and 311 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 a sheet feeding roller made of a material with a high coefficient of friction such as rubber, and 6A is its roller shaft.A scoop-shaped vapor pan 7 is held on the roller shaft 6A, and a pinch roller (not shown) is separated from the roller 6. !1Jffi An operating member 8 having an operating lever 8A and a locking protrusion 8B is rotatably fitted. Further, 9 is a gear for driving the sheet feed roller 6, and is composed of a large gear 9^ 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, when the sheet feed roller 6 is driven by the sheet feed motor 13 via the swing lever member 14 as will be described later, the discharge roller shaft 11A can be rotated via the gear 9.

A discharge roller 11 is attached to a predetermined position on the discharge roller shaft 11A, and is made of a material with a large friction coefficient such as rubber, and has an engagement member on its outer periphery to hold the trailing edge of the sheet during discharge. A groove 11B is provided around the circumference.

15 is a gear-shaped discharge spur 16 attached to these discharge rollers 11.
17 is a support member that supports the spur holder 15 by a support shaft 15^, and the support member 17 is attached to a frame-shaped spur deflection lever 18. The spur biasing lever 18 is attached to the locking protrusion 8B of the operating member 8 by a spring (not shown).
By biasing it toward , the discharge spur 16A and sheet presser spur 16B provided on the spur holder 15 can be kept in contact with the paper discharge roller 11.

A feeding roller 20 is made of rubber or the like and has a small-diameter peripheral surface 20^ and a large-diameter peripheral surface 2■.
0 is fixed to a feed roller base 21, and the base 21 is further formed with collar portions 21^ and 21B. The feed roller 20 and its base body 21 are slidably fitted on the feed roller shaft 23 on both the left and right sides, but by giving the feed roller shaft 23 a 0-shaped cross section, The roller 20 and the base body 21 can be rotated together with the roller shaft 23.

The feed roller shaft 23 is supported by the side plate l^ and IB, and a timing gear 2 is attached to one end of the feed roller shaft 23.
4 is installed. This timing gear 24 includes an external gear part 25 having an external tooth part 25^ and a tooth-missing part 25B at the center thereof, and an internal gear part 25 provided along the outer circumference and having an internal tooth part 26^ and a tooth-missing part 2BB. A space 24^ is interposed between the external gear part 25 and the internal gear part 26.

Next, the means for switching and driving the feed roller shaft 23 and the shift roller shaft 6^ via the timing gear 24 will be explained. The above-mentioned sheet feeding motor 13 is attached to a motor board IC fixed to the side plate l^ with a predetermined distance therebetween, and a trigger device 27 is further fixed to this board IC. Thus, the motor 13 can rotate the idle gear 14B provided on the swing lever member 14 via the pinion gear (not shown) attached to the shaft 138 and the swing lever glaze 14^. In addition, here, the swing lever member
4 is rotatably supported by swing lever 1rll+14^.

Reference numerals 31 and 32 denote a swing gear and a sheet feeding gear, respectively, which are pivotally supported on the upper and lower wings of the swing lever member 14, and the gear 31 includes a large gear 31^ and a small gear 31.
B, and Gyaco 2 has a large gear 32A and a small gear 3.
2B, and the respective large gears 31^ and 32^ mesh with the idle gear 14B. 33 is an engagement member attached to the lever member 14, and 34 is an elastic friction piece.

Furthermore, the trigger device 27 is rotatably supported by a shaft 35^, and includes a trigger lever 35 having a locking hook 35B formed at its tip, a plunger 36 for operating the trigger lever 35, a trigger solenoid 37, and a return spring 38.
It is composed of

40^ and 40B are left and right slider units, respectively, which are slidably held on a unit guide shaft 41. Further, the guide shaft 41 is supported by the side plates 1^ and 1B, and a long groove 41^° is formed in the shaft 41 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 slider units 40A and 40B will be explained in detail with reference to FIG. In addition, units 40^ and 40B
It has a symmetrical structure. Here, 44 is the slider body, 44^ is its knob, 44B is a guide hole for slidably supporting the body 44A on the guide shaft 41, and 44C
440 is a guide cylinder which is erected upward from the bottom of the main body and into which the guide column 43A of the pressure plate 43 is slidably fitted; 440 is an engagement square hole into which the lock pawl 43B of the pressure plate 43 is engaged;
Reference numeral 44E denotes a pivot portion that pivots between the flange portions 21^ and 218 of the feeding roller base body 21.

45 is a separation claw member having a separation claw 45^ at the tip.
It is attached to the I + G Nino I + No ÷ 111 # Muri + Je Ro Nine 1 I Open 1 h White position, and its clockwise rotation movement is caused by the stopper portion 45C at the upper end of the separation claw member 45 being connected to the collar portion of the feeding roller base 21. It is regulated by coming into contact with 21B from below.

Furthermore, the separating claw member 45 has an arm portion 86 extending from the rear side of the shaft bin 45B, and this extending arm portion 60
is bent into a keyed hand shape as shown in this figure. In this manner, when the pressure plate 43 is pressed down, which will be described later, the upper surface of the bent portion is pressed by the elastic arm lil of the pressure plate 43, thereby rotating the separation claw member 45 around the shaft bin 45B, thereby causing the separation claw 45^ to rotate. The stopper portion 45C can be kept in contact with the lower surface of the flange portion 21B of the feeding roller base body 21 by lifting it upward.

46 holds the pressure plate 43 and guides the guide shaft 4 by the feeding lever 4z.
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 46. For this purpose, the shaft hole of the member 46 is provided with a rotation preventing protrusion 4 that engages with the long groove 41^ of the guide shaft 41.
6^ 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. Here, the pressure plate 43 is entirely or at least its elastic arm 61 is made of Delrin. The friction plate 48 attached to the upper surface of the friction plate 48 is made of a material having a relatively large coefficient of friction such as cork or felt.

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 40A and 40B, when the feeding lever 42 shown in FIG. 1 is manually rotated in the direction of arrow A, the second
The set arm member 46 shown in the figure and the pressure plate 43 that is engaged with the set arm member 46 through the engagement hole 430 as shown in FIG. 3A.
is rotated against the spring force of the spring 47, and the lock pawl 43B of the pressure plate 43 can be locked in the engagement square hole 44D provided at the bottom of the slider body 44 as shown in FIG. 3B.

The related operations of the pressure plate 43 and separation claw member 45 at this time will be explained with reference to FIGS. 78 to 7C. Assuming that no sheet is loaded on the pressure plate 43, the pressure plate 43 is biased toward the collar 21B of the feed roller base 21 by the spring 47 as described above, and is kept in the state shown in Figure M78. It will be done.

Here, when the pressure plate 43 starts to be pressed down by manual operation of the paper feed lever 42 (see FIG. 1), the pressure plate 43 is moved through the shaft pin 45B so that it is allowed to swing according to the movement of the sheet during paper feeding. The tip of the separation claw member 45, which is pivotably supported, is lowered by its own weight, and the separation claw 45A comes into contact with the upper surface of the pressure plate 43, as shown in FIG. 7B.

However, if there is no means to raise the separation claw member 45 and the pressure plate 43 continues to be pressed down, the separation claw member 45
5 comes into contact with the slider base 44 at its tip, and in this state, the space between the separating claw 45A and the top surface of the pressure plate 43 is extremely narrow, and as mentioned earlier, it is difficult to insert the sheet between them. Sometimes, a part of the sheet is separated by the separation claw 45.
It protrudes above A and becomes the original jam.

However, in this example, when the pressure plate 43 continues to be pressed down as described above, the elastic arm portion 61 of the pressure plate 43 presses down the extending arm portion 60 of the separation claw member 45 from above due to its spring force, as shown in FIG. 7C. , Due to the action of the lever, the tip of the separating claw member 45h! Lifted in the Y direction. In this case, the stopper 45C of the member 45 comes into contact with the flange, while the pressure plate 43 rises somewhat by the engagement play after its lock claw 43B is locked in the square hole 44D. Separation claw 4
A sufficient distance can be maintained between the pressure plate 43 and the paper feeding roller 5A (not shown), so that the sheet bundle can be inserted and set without any trouble.

In the above explanation, the pressure plate 43 itself or its arm portion 61 is made of an elastic body, but instead of this, the separation claw member 45
The extended arm portion 60 provided on the side of
The rigid arm part 6 on the pressure plate side is used to absorb the stress generated due to bumps, etc.
1 may be used to lift the separation claw 45A.

In this way, 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 45A, and then the feeding lever 42 is rotated in the opposite direction to the direction of arrow A. When the lock claw 43B is disengaged and the pressure plate 43 is biased upward by the spring force of the spring 47, the stopper portion 45C of the separation claw holding member 45 touches the collar portion 21B of the feed roller base 21. Due to this contact, sheets can be set on the slider unit with a predetermined gap maintained between the upper surface of the sheet and the feeding 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. 4A, the engaging portion 33 of the swing lever member 14 is engaged by the trigger lever 35. Depending on the engaged state, the swing gear pinion 31B of the swing lever member 14 is positioned at the tooth-missing portion 25B of the external repelling tooth portion 25 of the timing gear 24.
That's what I do. On the other hand, the small gear 32B of the sheet feed gear 32, which is pivotally supported on the other end side of the swing lever member 14, meshes with the large gear 9A on the sheet feed roller shaft 6A 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 feeding roller is moved through the small gear 32B1 and the large gear 9^. In this state, the swing gear pinion 31B is rotated clockwise to remove the paddy.
Since the timing gear 2 is in contact with the missing tooth portion 25B of
There is no need to rotate 4.

In addition, 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 14B 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 26^ of the internal gear portion 26, and the small gear 32B that meshes with the large gear 9A on the sheet feeding roller shaft 6A side. is dissociated from the large gear 9A.

Therefore, the timing gear 24 moves in the direction of arrow C as shown in FIG. 4B.
The feed roller 20 begins to rotate via the feed roller shaft 23. In this state, solenoid 37
Power has been stopped. FIG. 5A shows a state in which the feed roller 20 begins to rotate in this manner, and as the rotation of the feed roller 20 in the direction of arrow C progresses, the large diameter circumferential surface 20 [I becomes larger than the sheet 5G. Since it is in contact with the upper surface, only one sheet 50 located at the uppermost position is separated by the separation claw 45A due to frictional force 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 portion 2BB of the external gear portion 26, as shown in FIG. 4C, and as the timing gear 24 stops rotating, the feeding roller 6 also stops.

Therefore, when the sheet feed motor 13 is next rotated in the positive direction of sheet feeding, the swing lever member 14 is rotated in the same direction by the rotation of the idle gear 14B in the direction of arrow B, and the pinion gears 31B and 32B are rotated at the timing. gear 24
The external teeth 25^ of the external gear portion of the roller 6 can be meshed with the large gear 9^ on the side of the sheet feed roller 6, and when the sheet feed roller 6 is rotated, the sheet 50 is moved as shown in FIG. 5C. 1-)”-vqaCl to 1-d
A big bag r stomach true mo resistance [4 boos 7 blame η talk 1 toru. 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 is in a position facing the sheet 50, so that the feeding roller 20
When the small gear 31B rotates to the toothless portion 25B of the internal gear portion 26, the feeding roller 2 (l) stops, and the state as shown in FIG. 4A is maintained.

Here, when the sheet feeding is further continued, the sheet 50 is moved between the ejection roller 11 and the sheet feeding spur 16 as shown in FIG.
The sheet 50, which is guided between the print head 4 and the print head 4 and is appropriately tensioned by the feeding roller 11, is maintained in a tensioned state in front of the print head 4. 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 16A and the sheet feed spur 16B
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,
Most of the force biasing spurs 16^ and 16B toward discharge roller 11 via spur lever 15 is applied to sheet feed spur 16[1. Therefore, in the state shown in FIG. 6A, the sheet 50 is mainly moved only by the spur 16B.
The sheet 50 is held between the spur 11 and the ejection roller 11, and there is no force to push it back due to the elasticity of the sheet 50, and the spur 16 is lightly touched along the tangential direction of the sheet 50. It's just keeping it.

In this way, as a result of the continuous sheet feeding after the end of recording, when the trailing edge 50A of the sheet 50 is fed to the position shown in FIG. 6B, the trailing edge 50^ is guided by the discharge spur 16^ and the discharge roller The sheet 50 falls into and is engaged with the engagement groove 11B of No. 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, when pressing down the pressure plate in order to set the sheet bundle on the pressure plate,
The pressing down action of the pressure plate engages the separation claw member and pulls the separation claw upward, so that a sufficient space can be maintained between the separation claw and the pressure plate, allowing the sheet to be set on the pressure plate accurately and quickly. It has become easier to do so.

[Brief explanation of drawings]

FIG. 1 is a partially exploded perspective view showing an example of the configuration of the feeding device of the printer of the present invention; FIG. 2 is an exploded perspective view of a slider that is the feeding mechanism; FIGS. 3A and 3B 48, 4B, and 4C are explanatory diagrams showing the operating states of the timing gear according to the present invention, and FIG. 5A, FIGS. 5B and 5C are explanatory views showing the process of operation of the feeding roller; FIGS. 6A and 6B are explanatory views showing the process of operation when a sheet is discharged by the discharge roller; FIGS. 7A- FIG. 7C is an explanatory diagram of the operation of the pressure plate and separation claw member according to the present invention during paper feeding. 6... Sheet feed roller, 13... Sheet feed motor, 20... Feed roller, 43... Pressure plate, 44... Slider body, 45... Separation claw member, 45^... Separation claw, 46... Set arm member, 47... Pressure plate spring, 50... Sheet, 60... Separation claw member extension arm, 61... Pressure plate elastic arm. 9 mouths Figure 38 Figure 4C Figure 5c''X44

Claims (1)

[Claims] 1) A pressure plate that loads aligned sheets, biases the sheets toward a separation claw, and keeps the sheets in a feedable state; and a support for the pressure plate, the separation claw being formed at the tip on the feeding side; A feeding device for a printer having a separation claw member pivotably supported on a printer, comprising means for pulling down the pressure plate in parallel when stacking the aligned sheets, and a lowering operation of the pressure plate lowering means. A feeding device for a printer, characterized in that the device further comprises means for lifting the separation claw by pivoting the separation claw member around a pivot portion.