JPS62244827A - Feeder for printer - Google Patents

Abstract

PURPOSE:To stabilize the exhibition of a sheet during paper feed, by forming a cam on the base body of a feed roller in a feeder so that the outer peripheral surface of a large diameter section of a feed roller is made into press-contact with the upper surface of sheets at a predetermined position. CONSTITUTION:In a feeder for a printer, there are provided a press plate on which sheets 50 aligned together are loaded, and which is held in a such condition that the sheets are urged toward the front end part of a separating pawl 45, a separating pawl holding member 45 on which the separating pawl 45A is formed at its front end and which is journalled swingably to the support member of the press plate, a feed roller 20 and cam members 211B, 212B, 213B. In association with the swinging operation of the cam members 211B, 212B and 213B, the outer peripheral surface 20b of a large diameter section of a feed roller 20 makes into contact wit the upper surface of the sheets 50 in the tangential direction, that is, the base member 21 of the feed roller for regulating the axial position of the feed roller 20 is formed thereon with the cam members 211B, 212B, 213B, and during paper feed, the cam member 212B rotated together with the feed roller 50 depresses the sheets 50 together with the feed roller 50 depresses the sheets 50 together the member 45, thereby the sheets may be stably fed.

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.

[Conventional technology]

In recent years, as the number of prints using cut sheets has increased, attempts have been made to incorporate cut sheet feeders into printers. However, when trying to incorporate an automatic cut sheet feeding mechanism into a printer, due to space constraints, it is difficult to maintain a wide gap between the feeding roller and the paper feeding roller.
The degree of freedom of the recording sheet is small, and the amount of backward feeding of the sheet is restricted.

Therefore, the feed roller is partially cut out in the circumferential direction so that a large-diameter circumferential surface and a small-diameter circumferential surface are formed. A method has been used that prevents the oxidation from being retained for a long time.

FIG. 9 shows an example of such a feed roller, where:
200 is a feeding roller, 200A is a small diameter portion thereof, 2
00B is its large diameter portion. In this case, by rotating the feeding roller 200 in the direction of arrow A, the sheet, for example, the printing paper 200, held on the substrate (not shown)
1 in the direction of arrow F2.

However, in such a paper feeding operation by the conventional feeding roller 200, the edge of the large diameter portion 200B of the feeding roller 200 may be in contact with the printing paper 201 or backward with respect to the axis 200C of the feeding roller 200. As a result, the operating direction F1 of the feeding roller 200 with respect to the printing paper 201 does not match the feeding direction F2, and furthermore, such a contact position i
ff Printing paper 201 that is sent out because P moves back and forth depending on the cumulative state of the printing paper 201
There was a problem that the behavior became unstable.

[Problem that the invention seeks to solve]

The purpose of the present invention is to focus on such problems, and in order to solve the problem, to always press the feeding section of the feeding rotary body against the surface at a predetermined position and start feeding. Therefore, it is an object of the present invention to provide a highly reliable printer feeding device that can stabilize the behavior during feeding of the paper I.

(Means for Solving the Problems) In order to achieve the above object, the present invention stacks the aligned sheets, biases the sheets toward the separating claw, and maintains the sheet in a ready-to-feed condition. A pressure plate, a separation claw holding member having a separation claw formed at the tip thereof and swingably supported on a supporting body of the pressure plate, and a separation claw holding member that presses against the upper surface of the sheet and immediately releases the sheets one by one from the claw. a cam member fixed coaxially with the feeding rotary body and capable of sliding the separation claw holding member 1 by slidingly contacting the upper surface of the separation claw holding member; This is characterized in that the feeding rotary body is brought into pressure contact with the upper surface of the sheet from the tangential direction through the swinging motion of the cam member.

[For production]

In a printer feeding device configured in this manner, a cam is formed on the base of the feeding rotor, which is provided coaxially with the feed rotor and is integral with the feed rotor, and defines the axial position of the feed rotor. death,
This cam holds the feeding rotating body so that it does not rotate unexpectedly while the feeding rotating body is on standby, and during feeding, the cam that rotates together with the feeding rotating body once loads the separating claw holding member together with the feeding rotating body. After pushing the seat down,
While gradually returning the separation claw holding member and the sheet upward in balance with the support spring of the pressure plate, the feeding rotating body can always be brought into contact with the sheet at a predetermined position, and the sheet can be fed in a stable state. be able to carry out compensation.

(Example) Hereinafter, an example of the wooden invention will be described in detail and concretely based on the drawings.

FIG. 1 shows an embodiment of the wooden invention. Here, 1 is a board, and a guide member 1 that slidably supports the carrier 2 by the bent left side plate lΔ and right side plate IB on both sides thereof. Ib
38 and 3B are pivoted. The carrier 2 is driven along the guide shafts 38 and 3B by a carrier motor and drive means (not shown), or the carrier 2 is equipped with a print head, for example, an inkjet head 4, and the print head 4 is provided with a By supplying No. 8 to the individual nozzles provided in the printer, ink can be ejected from the nozzles 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, 68 is the roller 'P+h, and the roller glaze 6 is
An operating lever 8 which holds the scoop-shaped vapor pan 7 and operates a pinch roller (not shown) from the roller 6, and an operating member 8 having a locking protrusion 8 [1] is rotatably fitted into the operating member 8. ing. Further, 9 is a gear for driving the sheet feed roller 6, and is composed of a large gear 9A and a small gear 9B, of which the small gear 9B meshes with the idle gear 10, and the idle gear 10 is connected to the discharge roller ll1lh118. It meshes with a drive gear 12 provided. 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 118 can be rotated via the gear 9.

Reference numeral 11 denotes a discharge roller that is attached to a predetermined position on the discharge roller @hl, and is made of a material with a large friction coefficient such as rubber, and has an engagement on its outer periphery to hold the trailing edge of the sheet during discharge. A matching groove 118 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 16B in a contactable manner, 17 supporting the spur holder 15 1hbt
A support member supported by sA, 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 811 of the operating member 8 by a spring (not shown), the spur holder 1
□' IJF ill; t. □１
6, yo, jwoo 1eyo□168□,.

The paper roller 11 can be kept in contact.

Reference numeral 20 denotes a feeding roller made of rubber or the like and having a small-diameter circumferential surface portion 20A and a large-diameter circumferential surface portion 20B, and the feeding roller 20 is fixed to a feeding roller base 21. Further, the base body 21 is formed with flanges 218 and 21B, and a slider body 4 (to be described later)
The feeding roller 20 and the base body 21 are kept rotatable by being pivoted by the four pivot parts 44E. In addition,
The flange portion 21B will be explained in more detail later.

Furthermore, although the feeding roller 20 and its base body 21 are slidably fitted to the feeding roller shaft 23 on both the left and right sides, by giving the feeding roller @23 a D-shaped cross section,
The feed roller 20 and the base body 21 can be rotated together with the roller shaft 23.

The feed roller l1iIk23 is pivotally supported by the side plates 18 and 1B, and a timing gear 24 is attached to one end thereof. This timing gear 24 is provided with an external toothed portion 25^ and a toothless portion 25 [along the external gear portion 25 and the outer peripheral portion] at the center thereof, and has an internal toothed portion 26.
A and an internal gear part 26 having a toothless part 21iB, and a space part 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 6A via the timing gear 24 will be explained. The above-mentioned sheet feeding motor 13 is attached to a motor board 1G fixed to the side plate IA at a predetermined distance, and a trigger device 27 is further fixed to this board 1c. However, due to the motor 13, that! pinion gear and swing lever shaft 14^ (not shown) attached to li [1113A
Idle gear 1 provided on swing lever member 14 via
4B can be rotated. Note that here, the swing lever member 14 is rotatably supported on the swing lever shaft 14^.

Reference numerals 31 and 32 denote a swing gear and a sheet feeding gear, respectively, which are pivotally supported by the upper and lower wings of the swing lever member 14, and the gear 31 includes a large gear 318 and a small gear 31.
B, and the gear 32 has a large gear 32A and a small gear 3.
2B, and the respective large gears 31A and 32A 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 35A, 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 ~41 is supported by the side plates IA and IB, and the shaft 41 has a long groove 41^ formed 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 40^ and 4011 will be explained in detail with reference to FIG. In addition, units 408 and 4■
It is configured symmetrically. Here, 44 is the slider body, 448 is its knob, and 44B is the main body 44^! 1I
44C is a guide hole that is slidably supported on I41; 44C is a guide tube that is erected from the bottom and into which guide column 43A of pressure plate 43 is slidably fitted; 44D is an engagement that locks lock claw 43B of pressure plate 43; The square hole 44E is a pivot portion that pivots between the flange portions 21A and 218 of the feeding roller base body 21. Also, 4
Reference numeral 5 denotes a separation claw holding member having a separation claw 458 at its tip, which is rotatably attached to the slider main body 44 via a shaft pin 45B, and its clockwise rotation is controlled by the separation claw holding member 45 at the upper end. The stopper portion 45G contacts the collar portion 21B of the feeding roller base 21 from below.

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 accordance with the rotational movement of the member 460, and for this purpose, the shaft hole of the member 460 is provided with a rotation stop protrusion 4 that engages with the long groove 41A of the guide shaft 41.
68 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, in the printer configured in this way, sheet 1-
The opening operation from setting the sheets to discharging the sheets will be explained with reference to each figure.

First, when setting sheets in the slider bodies 1-40A and 40B, move the feed lever 42 shown in FIG.
When the guide Ili+b 41 is rotated manually, the set arm member 46 shown in FIG. 2 and the pressure F9. 43 can be rotated against the spring force of the spring 47, and the lock claw 43B of the pressure plate 43 can be locked into the engagement square hole 440 provided at the bottom of the slider body 44 as shown in FIG. 3B. .

Therefore, at this point, 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 claw 45Δ, and then the feeding lever 42 is turned in the opposite direction to the direction of the arrow A. When the locking claw 43B is released from the engagement 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. By coming into contact with the portion 21B, sheets can be set on the slider unit while maintaining a predetermined gap 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. In the engaged state, the swing gear pinion 31B of the swing lever member 14 is positioned in the toothless portion 25B 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 feeding roller is moved through the small gear 32B and the large gear 9A. 6 can be rotated clockwise, and in this state, the swing gear pinion 31B is rotated in the external gear section 25.
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 tries to rotate in the counterclockwise direction 51 due to the reverse rotation of the motor 13, but due to the locking of the trigger lever 35, The rotational movement of the swing 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 float 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 gear 26A of the internal gear portion 26, and the small gear 32B 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 as shown in the arrow El as shown in the Mn2 diagram.
l Rotate in the direction of C and feed roller! The feeding roller 20 begins to rotate via Tl1123. Note that in this state, power supply to the solenoid 37 is stopped. FIG. 5Δ shows a state before the feed roller 20 starts rotating, and as the feed roller 20 rotates in the direction of arrow C from this state, its large diameter circumferential surface 20B approaches the upper surface of the sheet 50. Since they are in contact with each other, the sheet 5 located at the top due to frictional force
Only one sheet of 0 is separated by the separating claw 45A and sent to the roller 6 side.

FIG. 5B shows a state in which the leading edge of the sheet 5o is guided between the sheet feed roller 6 and the pinch roller 51 as described above; in this state, the sheet 5o is kept in a loop shape; In the timing gear 24, the small gear 31B is guided to the toothless portion 26B 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 sheet feeding direction, the swing lever member 14 is rotated in the same direction by the rotation of the idle gear 141) in the direction of the arrow B. can be brought into mesh with the external teeth 25A of the external gear portion of the timing gear 24 and the large gear 98 on the side of the sheet feeding roller 6, and by rotating the sheet feeding roller 6, the sheet 50 is moved as shown in FIG. 5C. As shown, it can be wound between the pinch roller 51 and the like. At this time, the feeding roller 2o also rotates, but at this timing, the small-diameter circumferential surface portion 20^ of the feeding roller 2o is in a position facing the sheet 50, so the sheet is not fed by the feeding roller 20. The small float 31 [1 is the tooth-missing portion 25 of the internal gear portion 26
When the feeding roller 2o has rotated to point B, it stops and is maintained in the state shown in FIG. 48.

Next, FIGS. 6 and 7A show the operations performed by the flange portion 21B of the feeding roller base 21 during the period from when the feeding roller 20 starts rotating from the standby state as shown in FIG. 5A until feeding. This will be explained with reference to FIG. 7B.

The feeding roller 20 and the roller base 21 are fixed to the roller shaft 23 so that their circumferential relative positions are as shown in FIG.
B has a stopper cam portion 211B, a push-down cam portion 212B, and a release cam portion 213B formed on its peripheral surface.

Therefore, a standby state in which no feeding operation is performed, that is,
After the feeding operation, when the feeding roller 2o is returned to the starting position as shown in FIG. 5A, the stopper cam portion 211B of the collar portion 21B moves against the stopper portion 4 of the separating claw member 45 as shown in FIG.
5C to prevent the feeding roller 20 from rotating inadvertently due to vibration or other reasons.

So, when it comes to feeding operation, the feeding roller! When d+23 is rotated, the feeding roller 20 and the roller base 21 (not shown here) are rotated in the direction of the arrow, and the separation claw holding member 45 is pushed downward by the push-down cam portion 212B as shown in FIG. be pushed down. Due to this pushing down operation, the sheet 50 is also pushed down via the separating claw 458, and the upper surface of the sheet 50 and the feeding roller 2
0 and a sufficient gap is maintained.

Then, as the feed roller shaft 23 rotates, the stopper member 45G of the separation claw holding member 45 is released from the push-down cam portion 21211 as shown in FIG. That is, the feeding peripheral surface portion contacts the upper surface of the sheet 50. In this state, the separation claw holding member 45 is released from the flange 21[1, so that the separation claw/15A is only lightly touching the edge of the uppermost sheet 50 due to its own weight. Therefore, the sheet 50 can be smoothly fed out without any resistance.

Thereafter, when feeding is completed by the large-diameter feeding circumferential surface portion 20B, the feeding roller 20 and the collar portion 21B are returned to the state shown in FIG. 6 by the continued rotation of the roller shaft 23.

When the sheet feeding continues, the sheet 50 is moved between the ejection roller 11 and the sheet feeding spur 16B as shown in FIG. 8A.
The IJ1 output roller 50 is held in front of the print head 4 and maintained in a state in which it is guided between the print head 4 and the IJ1 output roller 50, which is properly tensioned by the IJ1 output roller 50. Therefore, in this state, the sheet 50
Printing is performed on the sheet by the print head 4, and then the sheet is continuously fed again.

In this case, the feed spur 168 and the sheet feed spur 16B
Since the spur boulder 15 is supported by the support member 17 of the spur lever 18 at a position closer to the spur 1611, the spurs 18A and 16B are biased toward the discharge roller 11 via the spur lever 15. Most of the force applied is applied to the sheet feed spur 16B. Therefore, in the state shown in FIG. 8A, the sheet 50 is mainly moved only by the spur 16B.
is held between the sheet 50 and the discharge roller 11, and one of the spurs 16^ does not have enough force to push it back due to the elasticity of the sheet 50, and lightly touches it along the tangential direction of the sheet 50. It's just keeping it.

In this way, as a result of the continued sheet feeding after the end of recording, when the rear end 50A of the sheet 50 is fed to the position shown in FIG. Then, the sheet 50 falls into engagement with the engagement groove 11B of the discharge roller 11, and the sheet 50 is stored in the stapler 52 by the discharge roller 11 as it is.

(Effects of the Invention) As described above, according to the present invention, the pressure plate is movable relative to the feeding rotary body in a direction perpendicular to its axis, and is integrated with the feeding rotary body. A cam is formed on the base of the feeding rotary body provided coaxially with the cam, and through the operation of this cam, the feeding peripheral surface of the feeding rotary body is always brought into proper contact with the upper surface of the sheet on the pressure plate in its tangential direction. Since a reliable feeding operation can be obtained, stable feeding operation by the feeding rotating body is guaranteed, and a highly reliable printer feeding device can be provided.

[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 4A, 4B and 4C are explanatory diagrams each showing the operating state of the timing gear according to the present invention; FIG. 58; 513 and 5C are explanatory diagrams showing the process of operation of the feeding roller according to the present invention, FIG. 6 is a side view showing the relative position of the feeding roller and the base cam, and FIG. 78 and FIG. 7B is an explanatory diagram showing the operation of the feeding roller and the base cam, FIGS. 88 and 8B are explanatory diagrams showing the process of operation when the sheet is discharged by the discharge roller, and FIG. FIG. 3 is an explanatory diagram showing an example of the operation of a feeding roller. 6... Sheet feed roller, 13... Sheet feed motor, 14... Swing lever member, 20.2GO... Feeding roller, 43... Pressure plate, 44... Slider body, 45...・Min AT claw holding member, 458... Separation claw, 47... Pressure plate spring, 50... Sea 1~. Figure 3B Figure 9

Claims (1)

[Scope of Claims] 1) A pressure plate that loads aligned sheets, biases the sheets toward a separation claw, and keeps the sheets in a feedable state; the separation claw is formed at the tip of the pressure plate; a separation claw holding member that is pivotally supported on a support body; a feeding rotary member that presses against the upper surface of the sheet and releases the sheets one by one from the separation claw and feeds the sheets; and the feeding member. a cam member fixed coaxially with the rotating body and capable of slidingly contacting the upper surface of the separation claw holding member to swing the separation claw holding member; A feeding device for a printer, characterized in that a body is brought into pressure contact with the upper surface of the sheet from a tangential direction.