JPH07267435A - Printing device - Google Patents

Abstract

PURPOSE:To provide a printing device capable of being miniaturized, increasing the applicability for a large sized paper sheet, preventing the occurrence of a jam, and smoothly feeding the paper sheet. CONSTITUTION:The base end side 30B of a paper mounting plate 30 is rotatably held on the tip side 50T outside a main body case 1 in the opened state of an opening/closing cover 50, and a spring 39 is provided between the tip side 30T of the paper mounting plate 30 and the opening/closing cover 50. The base end side 30B of the paper mounting plate 30 is protruded to the outside of the main body case 1 in the opened state of the opening/closing cover 50, and the whole paper mounting plate 30 can be stored in the main body case 1 in the closed state of the opening/closing cover 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing cover for opening and closing an opening of a main body case, and feeding a sheet on a sheet mounting plate to a printing section in the main body case by rotating a paper feed roller. The present invention relates to a printing apparatus having a feedable full length.

[0002]

2. Description of the Related Art In FIG. 7, a printing apparatus comprises a sheet feeding device 10 arranged in a main body case 1, a sheet conveying mechanism 70 (conveying rollers 71, 72, etc.) and a left side of the sheet conveying mechanism 70 in FIG. It is formed to print an image on a sheet fed in the X direction, including a printing section, a fixing device and the like (not shown) disposed in the, and is used as an electrophotographic apparatus, a facsimile, a copying machine, or the like.

The sheet feeding device 10 comprises a sheet feeding roller 11, a sheet separating mechanism 15 and a sheet placing plate 30. The paper loading plate 30 has a base end 30B rotatably supported by a pin 31 and a front end 30T urged toward the paper feed roller 11 by a spring 39. Further, the paper separating mechanism 15 includes a support shaft 19
A cork paper separation pad 17 attached to the upper surface of a holding member 16 that is rotatably supported by means of a spring 18 is pressed against the paper feed roller 11.

Therefore, when the paper feed roller 11 is rotated once, the paper on the paper placing plate 30 is discharged from the downstream side engagement point Q and is fed to the paper transport mechanism 70. After that,
The conveyance rollers 71 and 72 convey (feed) to the printing unit in the X direction. Paper feed roller 11 and paper separation pad 17
Even if two sheets of paper picked up between
Only one sheet can be separated and fed.

On the other hand, the opening / closing cover 50 for opening / closing the opening 2 of the main body case 1 has its base end side 50B rotatably supported by a support shaft 51, and is in an open state shown by a solid line and a closed state shown by a two-dot chain line. And can be selected. Note that 50T is the tip side, 65T
Is a sheet width regulation plate.

Here, such a printing apparatus is no exception and further reduction in size and weight is desired. Thus, in many cases, in order to reduce the size of the main body case 1 in the X direction, the total length of the sheet placing plate 30 is shortened, and the shortened portion is replaced by the open / close cover 50 in the open state in many cases. . This makes it possible to reduce the overall length of the sheet placing plate 30 to reduce the size thereof and to use the opening / closing cover 50 to apply the sheet of large size (length). It should be noted that, compared with the case where a paper cassette having a paper loading plate corresponding to the paper length is detachably provided in the main body case 1, the one that also serves as the opening / closing cover 2 is intended to be downsized when not in use. be able to.

[0007]

By the way, the following problems have been pointed out with the widespread use. That is, when a large number of sheets are placed on the sheet placing plate 30 (50) or a thick sheet is placed on the sheet placing plate 30 (50) and a printing operation is performed, a jam easily occurs.

More specifically, the sheet advancing angle θi is determined by the relationship between the inclination angle of the sheet mounting plate 30 and the inclination angle of the sheet separating pad 17, as shown in FIG. Therefore, when the approach angle at which the sheet can be smoothly fed is set to “θ1” shown in FIG. 8A, when the thickness h of the placed paper P becomes large as shown in FIG. 30T tip side 30T
Due to its weight, resists the biasing force F of the spring 39.
That is, since the base end side 30B of the sheet placing plate 30 is rotatably supported by the pin 31, the inclination angle of the sheet placing plate 30 becomes large.

Therefore, the approach angle θi defined as a relative angle with respect to the sheet separating pad 17 having a substantially constant inclination angle becomes large as “θ2” shown in FIG.
Then, the paper separation pad 1 with excessive friction resistance at the leading edge of the paper
Because it will hit the 7 at a steep angle in the vertical direction,
It becomes impossible to proceed to the downstream side engagement point Q side between the sheet feeding roller 11 and the sheet separating pad 17. In other words, jamming is likely to occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide a printing apparatus capable of smoothly feeding a sheet while preventing the occurrence of a jam while increasing the applicability of a small-sized sheet and a large-sized sheet.

[0011]

According to a first aspect of the present invention, there is provided a printing apparatus, wherein a base end side is rotatably held by a main body case and an opening / closing cover for opening and closing an opening of the main body case, and a base end side is rotatable. And a paper placement plate whose front end is biased toward the paper feed roller by a spring, and feeds the paper on the paper placement plate to the printing unit in the main body case by rotating the paper feed roller. In a printing apparatus including a sheet feeding device formed to be capable of feeding, a base end side of the sheet placement plate is rotatably held to a tip end side that is an outer side of the main body case when the opening / closing cover is open. The spring is interposed between the front end side of the paper stacking plate and the opening / closing cover, and the base end side of the paper stacking plate is projected to the outside of the main body case when the open / close cover is open. And in the closed state, the whole of the paper placement plate is Was capable of accommodating configuration in the case, characterized in that.

According to a second aspect of the present invention, there is provided a printing apparatus in which a pin provided on a base end side of the sheet placing plate is in a sheet feeding direction when the main body case provided on a front end side of the opening / closing cover is open. Slidably inserted into a long groove extending in the direction to hold the sheet placement plate rotatably on the opening / closing cover, and from the upper side to the lower side in the main body case, the rotation center direction of the opening / closing cover. Is provided with an arc-shaped guide groove formed so as to approach the sheet guide plate, and a guide pin slidable in the guide groove is provided on the leading end side of the sheet placing plate.

Further, according to a third aspect of the present invention, the printing apparatus according to the third aspect is provided with an inclined guide surface that is inclined from the upper side to the lower side inside the main body case, and the inclined guide surface is provided on the sheet placing plate. And a driven pin slidable with the opening / closing cover is used to turn the opening / closing cover from the open state to the closed state, and the leading end side of the sheet placing plate approaches the opening / closing cover side against the biasing force of the spring. It is characterized in that it is configured to be capable of generating a forcing force.

[0014]

In the invention of claim 1 having the above-mentioned structure, when the opening / closing cover whose base end side is rotatably held by the main body case is opened in use, the opening / closing cover is rotatably held on the tip end side of the opening / closing cover. The base end side of the sheet loading plate moves to the outside of the main body case. That is, since the base end side of the sheet stacking plate can be projected to the outside of the main body case, even if the front end side inside the main body case is shortened, the base end side protruding outside the main body case can be made long. It is possible to increase the total length of the sheet placing plate. That is, the variation range of the inclination angle of the sheet placement plate can be reduced, so that the approach angle can be kept small.

Therefore, it is possible to prevent paper jam and smoothly feed the paper while achieving downsizing and expansion of the paper size applicability, and it is possible to perform printing operation even when a large amount of paper is placed at once. Becomes

According to the second aspect of the present invention, the pin provided on the base end side of the sheet stacking plate is slidably fitted in the long groove provided on the tip end side of the opening / closing cover, and on the tip end side thereof. The provided guide pin is slidable in the guide groove facing the center of rotation of the open / close cover. Therefore, when the open / close cover is rotated from the open state to the closed state, the base end side of the sheet placing plate rotates about the pin and the front end side moves along the guide groove. That is, the posture of the sheet placement plate changes so as to overlap the open / close cover.

Thus, in addition to the operation of the first aspect of the present invention, a longer paper loading plate can be accommodated in the main body case in parallel with the opening / closing cover, so that the overall length of the paper loading plate is increased. Even so, the storage space inside the main body case can be made very small. In addition, it is possible to further narrow the variation range of the paper entry angle during use.

Further, in the case of the third aspect of the invention, when the opening / closing cover is rotated to change from the open state to the closed state,
By the cooperation of the driven pin on the sheet placing plate side and the inclined guide surface on the main body case side, a compulsory force that causes the sheet placing plate to approach the open / close cover is generated by using the turning force.

Therefore, in addition to the operation of the second aspect of the present invention, the work of accommodating the sheet stacking plate in the main body case due to the closing and pivoting of the opening / closing cover can be performed more lightly and easily.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. In this printing apparatus, as shown in FIG. 1 showing the open state of the open / close cover 50 and FIG. 5 showing the closed state of the open / close cover 50, the base end side 30B of the sheet placing plate 30 is outside the main body case 1 when the open / close cover 50 is open. The opening / closing cover 5 is rotatably held by the leading end side 50T, and a spring 39 is interposed between the leading end side 30T of the sheet placing plate 30 and the opening / closing cover 50.
In the opened state of 0, the base end side 30B of the sheet placing plate 30 is projected to the outside of the main body case 1, and in the closed state, the entire sheet placing plate 30 can be housed in the main body case 1.

Further, the attitude adjusting mechanism at the time of accommodation (31, 53,
6, 35) are provided, and the posture of the sheet placing plate 30 is adjusted so as to be parallel to the opening / closing cover 50 by utilizing the rotational movement of the opening / closing cover 50 from the open state to the closed state, so that a long sheet is placed. The placing plate 30 is configured to be accommodated in the main body case 1 in a small space.

Further, the forced force generating mechanism (7, 36) is provided so that the attitude adjustment by the attitude adjusting mechanism at the time of accommodation of the sheet placing plate 30 can be easily performed with a light force.

Further, the paper supply position lock / release mechanism 4
0 is provided so that the sheet placing plate 30 can be held (locked) at a predetermined position when the sheet is replenished to facilitate the sheet replenishment, and the sheet feeding plate 21 can be rotated by rotating the sheet feeding roller 21. The lock can be automatically released to facilitate paper supply work and handling.

Furthermore, a stopper mechanism 20 is provided,
The lowering position of the sheet placing plate 30 at the time of replenishing the sheet is limited to prevent the occurrence of a situation where an excessive amount of sheet is placed, and the sudden release force when the spring 39 is over-compressed to prevent the sheet from being released. It is formed so as to protect the actuator 60 of the detector.

In FIG. 1, the opening / closing cover 50 is rotatably held by the main body case 1 through the support shaft 51 at the base end side 50B and can open and close the opening 2. Tip side 50T
The standing portion 52 having the long groove 53 is provided in the.
A paper tray 55 is housed in the housing chamber 54 so as to be drawn out in the direction indicated by the chain double-dashed line. This is because it can be applied to even larger sheets. Reference numeral 59 is a knob for opening / closing operation.

A pin 31 slidably and rotatably fitted in the long groove 53 is provided in an upper portion of the base plate side 30B of the sheet stacking plate 30, and the front end side 30T has an opening / closing cover 50.
The feeding roller 1 is urged by the urging force F of the spring 39 interposed between
It is biased in the direction of 1. Although the spring 39 is shown at a convenient position for the sake of simplicity, it is actually provided between the driven pin 36 and the support shaft 42, which will be described later in detail. Further, the paper width regulation plate 65 is provided on the paper placement plate 30.
It is provided in.

Thus, the base end side 30B (pin 31) forming the center of rotation of the sheet placing plate 30 is largely projected to the outside of the main body case 1 and the front end side 50T (5) of the opening / closing cover 50.
Since it can be moved to 2), the sheet placing plate 30 can be significantly lengthened as compared with the case of the conventional example (FIG. 7). That is, the variation range of the inclination angle of the sheet placement plate 30, that is, the approach angle θi, based on the amount of placed sheets (height), can be made extremely small.

However, if the opening / closing cover 50 is rotated to the closed state around the rotation center (the support shaft 51) while being kept urged by the spring 39, the sheet mounting plate in the main body case 1 A large storage space for 30 must be secured. This may impede further miniaturization.

Therefore, the accommodation posture adjusting mechanism (31,
53, 6, 35) are provided. That is, the pin 31 provided on the base end side 30B of the sheet placing plate 30 slides in the long groove 53 extending in the sheet feeding direction (X) in the open state provided on the tip side 50T (52) of the opening / closing cover 50. The guide pin 35 provided on the front end side 30T of the sheet placement plate 30 is gradually inserted toward the support shaft 51 from the upper side to the lower side in the main body case 1 while being inserted as much as possible. It is configured to be slidably mounted in the arc-shaped guide groove 6 formed in the.

Therefore, when the opening / closing cover 50 is rotated in the R1 direction (CCW opposite to the clockwise rotation direction) shown in FIG. 4 with the support shaft 51 as the rotation center, the leading end side 30T of the sheet stacking plate 30 is guided by the guide pin. It moves downward in the guide groove 6 via 35 and rotates in the R11 (CW) direction with the pin 31 on the base end side 30B as the center of rotation. Therefore, when the opening / closing cover 50 is in the closed state as shown in FIG. 5, the sheet placing plate 30 can be housed in a posture parallel to the inside of the opening / closing cover 50, and a large space reduction can be achieved.

As shown in FIG. 1, the forcible force generating mechanism provided for facilitating the posture adjustment of the sheet placing plate 30 with light force, simply and smoothly, is driven by the inclined guide surface 7 and the follower. And a pin 36. The inclined guide surface 7 is provided so as to incline toward the inside of the main body case 1 from the upper side to the lower side in the main body case 1, and the driven pin 36 is provided.
Is provided on the lower surface side of the sheet placing plate 30.

That is, in FIG. 4, the opening / closing cover 50
When is rotated about the support shaft 51 in the R1 direction, the sheet mounting plate 30 is rotated about the pin 31 in the R11 direction.
However, since the guide pin 35 fitted in the guide groove 6 receives not only the urging force F of the spring 39 but also the weight of the sheet placing plate 30, the guide pin 35 depends on the shape of the guide groove 6 and the magnitude of the sliding resistance. It is assumed that the load will be high.

Therefore, when the opening / closing cover 50 is rotated in the R1 direction, the rotation power is utilized to cause the driven pin 36 and the inclined guide surface 7 to cooperate with each other so that the sheet mounting plate 30 is shown in FIG. It is configured to generate a pulling force Fd. Therefore, if the opening / closing cover 50 is rotated in the R1 direction with a light force, the attitude adjustment mechanism for accommodating the housing makes it possible to easily adjust the attitude in which the sheet placing plate 30 approaches and is parallel to the inside of the opening / closing cover 50.

Here, it should be noted that the shape of the guide groove 6 does not have to be a circular arc on a perfect circular locus with respect to the rotation center (pin 31) of the sheet placing plate 30. When the open / close cover 50 is in the closed state shown in FIG. 5, the sheet placing plate 30 can be guided so as to be in the posture, and the leading edge of the sheet placing plate 30 is in the middle of the other components (for example, feeding sheet). If it does not interfere with the paper roller 11), it can be selectively formed as an arbitrary locus.

In order to further expand this degree of freedom, a long groove 53 is provided on the tip side 50T of the opening / closing cover 50,
Moreover, the pin 31 provided on the base end side 30B of the sheet placing plate 30 is slidably mounted in the long groove 53. Therefore, in this embodiment, immediately after the opening / closing cover 50 rotates in the R1 direction shown in FIG. 4, the pin 31 moves in the X10 direction due to the regulation of the guide groove 6, and the rotation angle of the opening / closing cover 50 becomes a certain value or more. After that, it is formed so as to move in the X11 direction.

That is, the processing accuracy of the sheet placing plate 30 and the guide groove 6 does not have to be made excessively high, and the degree of freedom regarding the mechanical alignment during assembly adjustment can be made very large, so that the assembly time can be shortened. And cost can be reduced.

Next, the paper supply position lock / release mechanism 40
Will be described mainly with reference to FIGS. 1 and 2. Paper loading plate 3
The lock member 41 is attached to the cutout opening 32 provided at the tip of the lock member 41.
Is rotatably mounted via a support shaft 42. The lock member 41 is pulled downward in FIG. 2 by the urging force of the spring 44 and is positionally restrained by the stop bar 43. The hook member 46 has a shape that can be locked (locked) with the lock member 41, and is held at a predetermined position (paper supply position) by the hook holding link 45.

Therefore, the hook member 46 and the lock member 41 constitute a sheet replenishment position locking mechanism, and the sheet mounting plate 30 can be locked at the sheet replenishment position.
That is, when the sheet placing plate 30 is rotated by the external force against the biasing force F of the spring 39 from the state shown by the solid line in FIG. The resisting force resists the biasing force of the spring 44, and FIG.
Then, the hook member 46 is rotated clockwise to jump over the hook member 46 downward.

Therefore, when the external force is removed, the sheet placing plate 3
0 tries to return to the direction shown by the solid line in FIG. 1 again, but the upper surface of the lock member 41 is positionally restricted by the lower surface of the hook member 46, and the lower surface is positionally restricted by the stop bar 43. The platen 30 can be locked at the paper supply position shown by the two-dot chain line in FIG.

Therefore, the operator is in charge of the sheet loading plate 3
The inconvenience of supplying paper with one hand while applying an external force against the biasing force F of the spring 39 to 0 is not inevitable. That is, the paper can be quickly and accurately placed with both hands on the paper placement plate 30 locked at the paper supply position.

In the case of this embodiment, the opening / closing cover 50
When the sheet loading plate 30 is opened, the sheet loading plate 30 is pushed up in the direction shown by the chain double-dashed line from the lower side in FIG. 1 by the urging force of the spring 39, so that the sheet loading plate 30 automatically moves to the sheet feeding position. Locked in. Therefore, it is possible to immediately set the paper on the paper placing plate 30.

The lock release mechanism (49, 48F, 4
8, 49S, 47, 45, 46), a cam 49 attached to the cam drive gear 14 shown in FIG. 2, a connecting shaft 47 rotatably held at a predetermined position, and the connecting shaft 47. Formed by the cam follower holding link 48 having the cam follower 48F, the spring 49S, and the hook member 46 attached to the hook holding link 45. By rotating the paper feeding roller 11, a paper replenishment position locking mechanism ( 41, 46) is automatically released from the held (locked) state.

That is, when the operating piece 13A locked to the spring end 13ST (spring 13S) of the spring clutch 13 shown in FIG. 2 is moved in the Z direction, the rotational force of the drive gear 13D is transmitted to the driven gear 13F. It
Then, since the driven gear 13F rotates in the R direction, the paper feed roller 11 rotates in the R direction via the idle gear 12 shown in FIG. The operation piece 13A is returned to the original position after one rotation.

Thus, the cam drive gear 14 meshing with the driven gear 13F causes the cam 49 to move the RV shown in FIGS.
When the cam follower holding link 48 rotates in the direction
It is tilted and rotated in the RV direction shown in FIG. 2 by the pulling force of 9S. Therefore, since the hook holding member 45 cyclically rotates via the connecting shaft 47, the hook member 46 is locked by the lock member 4.
Move away from 1. Therefore, the sheet placing plate 30 moves in the direction in which the sheet is pressed against the sheet feeding roller 11 by the urging force F of the spring 39. That is, the locked state is automatically released. It should be noted that when the cam drive gear 14 makes one rotation, the hook member 46 returns to the fixed position (sheet supply position).

The stopper mechanism 20, as shown in FIG.
Locking member 2 provided on the base end side 50B of the opening / closing cover 50
1 (stopper surface 22) and the leading end side 30 of the sheet placement plate 30
The lower limit position of the sheet placing plate 30 (30T) at the time of replenishing the sheet is limited by the engaging member 25 (contact surface 26) provided at T.

That is, in order to replenish new paper when the paper runs out, the paper loading plate 30 shown by the solid line in FIG.
1 is rotated about the rotation center, and the front end side 30T is pushed further below the sheet replenishment position shown by the chain double-dashed line in FIG. That is, when the front end side 30T of the sheet placing plate 30 is moved in the Y30 direction shown in FIG. 3, the position is restrained when the contact surface 26 contacts the stopper surface 22.

Before the opening / closing cover 50 is closed as shown in FIG. 5, the sheet placing plate 30 (front end side 30T).
Moves in the X30 direction shown in FIG. 6, so stop surface 2
2 and the contact surface 26 are formed so as not to contact each other. At this time, the locking member 21 is housed in the cutout opening 32 of the sheet placing plate 30 (30T).

Next, the operation of this embodiment will be described. In use, the opening / closing cover 50 in the closed state shown in FIG.
The knob 59 is pulled to the right in the figure, and is rotated clockwise in FIG. 1 about the support shaft 51 on the base end side 50B to be opened.

At this time, since the sheet placing plate 30 is pressed upward in FIG. 1 by the urging force F of the spring 39, the sheet placing plate 30 is rotated around the base end side 30B (pin 31) protruding outside the main body case 1. The tip side 30T moves upward along the guide groove 6. However, the lock member 41 that moves from the bottom to the top
Stops when the hook member 46, which is stationary at the paper supply position, is engaged. That is, the sheet stacking plate 30 is shown in FIG.
The paper is automatically set to the paper supply position indicated by the dotted line.

If the size of the sheet to be placed is long, the sheet tray 55 is pulled out in the direction indicated by the chain double-dashed line in FIG.

In this way, the operator is in charge of the sheet loading plate 30.
Further, desired paper can be immediately placed (set) on the paper tray 55. Unlike the case of the conventional example (FIG. 7), it is not necessary to press the sheet mounting plate 30 with one hand against the urging force F of the spring 39, so that the sheet mounting plate 30 can be mounted quickly and accurately. Since the stopper mechanism 20 is provided, it is possible to prevent an excessive amount of sheets from being placed.

When the paper placement is completed, a print command is issued. Then, the operating piece 13A shown in FIG. 2 moves in the Z direction, so that the spring clutch 13 is turned on and the driven gear 1 is turned on.
Rotate 3F in the R direction. Then, the paper feed roller 11 starts to rotate in the R direction shown in FIG.

At the same time, the lock release mechanism (49,
48F, 48, 49S, 47, 45, 46) act to separate the hook member 46 in the locked state shown in FIG. 2 from the lock member 41. Therefore, since the locked state is automatically released, the sheet placing plate 30 is pushed up by the urging force F of the spring 39 to the state shown by the solid line in FIG. That is, the paper on the paper placement plate 30 is pressed and engaged with the paper feed roller 11.

At this time, the base end side 30B of the sheet placing plate 30
As shown in FIG. 1, since the pin 31 is rotatably held by the pin 31 inserted into the tip side 50T (long groove 53) of the opening / closing cover 50 protruding to the outside of the main body case 1, it is placed. Even if there is a large amount of paper, the approach angle θi shown in FIG. 8 is accumulated within the approach angle θ1 that allows smooth feeding. Therefore, the uppermost one sheet can be smoothly advanced in the direction of the downstream side engagement point Q. No jam occurs.

Thereafter, the paper is carried by the paper carrying mechanism 70 in the X direction toward the printing section and subjected to a printing process. Then, when there is no more paper on the paper placement plate 30, new paper is replenished by the following procedure.

That is, the sheet stacking plate 3 shown by the solid line in FIG.
0 is pushed down against the urging force F of the spring 39 by hand. The lock member 41 shown in FIG. 2 pushes down the hook member 46 until it jumps, and then releases the hand. Then, the paper sheet loading plate 30 causes the spring 39 to move.
It is returned upward by the urging force F of. Here, the paper supply position locking mechanism (41, 46) is activated, and the paper placement plate 30 is moved to the position shown in FIG.
Lock at the paper supply position indicated by the two-dot chain line. Therefore, the operator can quickly replenish the paper with both hands as in the case of the initial setting.

When the sheet placing plate 30 is pushed down, if a force is applied to the sheet placing plate 30, the stopper mechanism (22, 25) works as shown in FIG. 3, and the lower limit of the sheet placing plate 30 is actuated. Limit the position. Therefore, it is possible to prevent an excessive amount of paper from being replenished, and it is possible to prevent the spring 39 from being over-compressed more than necessary. Therefore, even if the hand is released, the paper placing plate 30 rapidly moves to the paper replenishment position side. It will not be pushed back. That is, since the actuator 60 or the like is not given an excessive shock, it is not damaged.

After the printing process is completed, the opening / closing cover 50 is shown in FIG.
In the case of the closed state shown in FIG. 1, the knob 59 of the open / close cover 50 in the open state shown in FIG. 1 is held and pushed upward. That is, as shown in FIG. 4, the support shaft 5 on the base end side 50B.
The opening / closing cover 50 is rotated around R1 in the R1 direction.

Then, the posture adjusting mechanism (31, 53, 6, 6)
35) works. That is, as shown in FIG.
The 0B pin 31 first moves in the long groove 53 in the X10 direction, and the guide pin 35 provided on the tip side 30T moves downward in the guide groove 6. Therefore, the sheet placing plate 30 gradually approaches the opening / closing cover 50 side in parallel.

At this time, a force in the X35 direction, which is the sum of the component force of the upward urging force F of the spring 39 and its own weight, is applied to the guide pin 35, but the forced force generating mechanism (7, 36) is applied to Fd.
Since a compulsory force for pushing in the direction is generated, the opening / closing cover 50 can be pushed down in the R1 direction with a light force. In the meantime, the pin 31 moves in the long groove 53 in the X11 direction.

Thus, when the open / close cover 50 is in the closed state shown in FIG. 5, the sheet placing plate 30 is accommodated in parallel with the upright open / close cover 50. Therefore, it is understood that the apparatus can be downsized because even the long sheet placing plate 30 can be accommodated in a small space.

Therefore, according to this embodiment, the base end side 30B of the sheet placing plate 30 is rotatably held on the tip end side 50T which is the outside of the main body case 1 in the opened state of the opening / closing cover 50, and A spring 39 is provided between the front end side 30T of the sheet placing plate 30 and the open / close cover 50, and the open / close cover 50 is provided.
In the open state, the base end side 30B of the sheet placing plate 30 is projected to the outside of the main body case 1, and in the closed state, the entire sheet placing plate 30 can be housed in the main body case 1. Even if the front end side 30T in the case 1 is shortened, if the base end side 30B protruding to the outside of the main body case 1 is made long, the total length of the sheet placing plate 30 can be increased. That is, since the variation range of the inclination angle of the sheet placement plate 30 can be reduced, the variation range of the entry angle can be kept small even when a large amount of sheets are placed. Therefore, it is possible to prevent jams and smoothly feed the sheets while achieving downsizing and expansion of the sheet size applicability, and it is possible to perform printing operation even when a large number of sheets are placed at once.

Further, the pin 31 provided on the base end side 30B of the paper placing plate 30 is slid into the long groove 53 extending in the paper feeding direction when the main body case 1 provided on the front end side 50T of the opening / closing cover 50 is opened. The paper placing plate 3 is movably fitted and inserted.
0 is rotatably held by the open / close cover 50, and
Opening / closing cover 50 from the upper side to the lower side in the body case
An arc-shaped guide groove 6 is formed so as to approach in the direction of the center of rotation, and a guide pin 35 slidable in the guide groove 6 is provided on the leading end side 30T of the sheet placing plate 30.
An attitude adjustment mechanism during storage (31, 5) capable of adjusting the attitude of the sheet placing plate 30 so as to be parallel to the open / close cover 50 by utilizing the rotational movement of the open / close cover 50 from the open state to the closed state.
3, 6, 35), so that
Body case 1 even if the total length of the sheet stacking plate 30 is increased
The storage space inside can be made very small, the interference between the sheet placing plate 30 and the sheet feeding roller 11 and the like can be completely avoided, and the variation range of the approach angle can be narrowed.

Further, an inclined guide surface 7 inclined from the upper side to the lower side in the main body case 1 toward the inner side of the main body case 1 is provided, and the paper guide plate 30 is provided with the inclined guide surface 7.
A driven pin 36 slidable with the opening / closing cover 50 is provided against the biasing force F of the spring 39 against the tip side 30T of the sheet placing plate 30 by utilizing the turning force of the opening / closing cover 50 from the open state to the closed state. Since the compulsory force generating mechanism (7, 36) configured to generate the compulsive force Fd for parallelizing and approaching to the 50 side is provided, the closing and rotating operation of the opening / closing cover 50 can be performed while smoothing the posture adjustment. It can be done lightly and easily,
The sheet placing plate 30 can be automatically and smoothly accommodated in the main body case 1.

Further, since the base end side 30B (pin 31) of the sheet placing plate 30 is slidably fitted in the long groove 53 on the base end side 50T of the opening / closing cover 50, the guide groove 6 and the inclined guide are provided. You can freely select the shape of the surface 7,
Since it is not necessary to increase the mechanical integrity of each component excessively, the assembly is easy and the cost can be reduced.

Further, since the opening / closing cover 50 is provided with the paper tray 55 which can freely move in and out, it is possible to stably load even larger paper.

Further, the paper supply position lock release mechanism 40
Is provided so that the sheet placing plate 30 can be locked at the sheet replenishing position when replenishing the sheet, and the lock can be automatically released by rotating the sheet feeding roller 11. Can be done quickly and easily.

Furthermore, a stopper mechanism 20 is provided,
Since it is formed so as to limit the lowering position of the sheet placing plate 30 at the time of replenishing the sheet, it is possible to prevent a situation in which an excessive amount of sheet is placed on the sheet placing plate 30 and to prevent the spring 39 from moving. When the over-compression is performed, the sudden release force does not have to be generated, so that the actuator 60 and the like of the paper detector can be safely protected.

[0069]

As is apparent from the above description, claim 1
According to the invention, the base end side of the sheet stacking plate is rotatably held on the front end side which is the outside of the main body case in the open state of the open / close cover, and the front end side of the sheet stacking plate and the open / close cover are A spring is interposed therebetween, and when the open / close cover is open, the base end side of the sheet stacking plate is projected to the outside of the main body case, and when closed, the entire sheet stacking plate can be housed in the main body case. Therefore, even if the front end side in the main body case is shortened, if the base end side protruding to the outside of the main body case is made long, the total length of the sheet placing plate can be increased. That is, since the variation range of the inclination angle of the sheet placement plate can be reduced, the variation range of the entry angle can be kept small even when a large amount of sheets are placed. Therefore, it is possible to prevent jams and smoothly feed the sheets while achieving downsizing and expansion of the sheet size applicability, and it is possible to perform printing operation even when a large number of sheets are placed at once.

According to the second aspect of the present invention, the pin provided on the base end side of the sheet placing plate is provided with the long groove extending in the sheet feeding direction when the main body case provided on the front end side of the opening / closing cover is opened. It is slidably inserted into the opening / closing cover so as to be rotatably supported by the opening / closing cover, and is formed so as to approach the opening / closing cover rotation center direction from the upper side to the lower side in the main body case. A circular arc-shaped guide groove, and a guide pin that can slide in the guide groove on the leading edge of the paper stacking plate, and uses the pivoting movement of the open / close cover from the open state to the closed state. Since the posture of the stacking plate can be adjusted so as to be parallel to the opening / closing cover, in addition to the effect of the invention of claim 1, even when the total length of the stacking plate is made larger, the stacking plate is accommodated in the main body case. Space can be made very small and Completely avoid possible and the range of variation of entry angle interference with the mounting plate sheet feeding roller or the like can be more narrow angle of the.

Further, according to the invention of claim 3, an inclined guide surface is provided which is inclined from the upper side to the lower side in the main body case toward the inside of the main body case, and the paper placing plate is slidable with the inclined guide surface. A movable driven pin is provided to force the leading edge of the sheet stacking plate to approach the opening / closing cover in parallel against the urging force of the spring by using the turning force from the open state of the opening / closing cover to the closed state. In addition to the effect of the invention of claim 2, the closing and rotating operation of the open / close cover can be performed easily and lightly, and the sheet loading plate Can be automatically and smoothly accommodated in the main body case.

[Brief description of drawings]

FIG. 1 is a side view showing an opened state of an opening / closing cover, which is a view for explaining an embodiment of the present invention.

FIG. 2 is likewise an external perspective view of a paper supply position lock / release mechanism.

FIG. 3 is likewise an external perspective view showing a position restraint state of the stopper mechanism.

FIG. 4 is a side view showing a posture adjustment state and a forced force generation state.

FIG. 5 is likewise a side view showing a closed state of the open / close cover.

FIG. 6 is likewise an external perspective view showing a stored state of the stopper mechanism.

FIG. 7 is a side view for explaining a conventional example.

FIG. 8 is a diagram for explaining the problems of the conventional example.

[Explanation of symbols]

 1 Main Body Case 2 Opening 6 Guide Groove 7 Inclined Guide Surface 10 Paper Feeding Device 11 Paper Feeding Roller 12 Idle Gear 13 Spring Clutch 13D Drive Gear 13F Driven Gear 13S Spring 13ST Spring End 13A Working Piece 14 Cam Drive Gear 15 Paper Separation Mechanism 16 Holding member 17 Paper separation pad 18 Spring 19 Spindle 20 Stopper mechanism (stopper) 21 Locking member 22 Stop surface 25 Engagement member 26 Abutment surface 30 Paper loading plate 30B Base end side 30T Tip side 31 Pin 32 Notch open part 35 Guide Pin 36 Driven Pin 39 Spring 40 Paper Replenishment Position Lock / Release Mechanism 41 Lock Member 42 Support Shaft 43 Stop Bar 44 Spring 45 Hook Holding Link 46 Hook Member 47 Connecting Shaft 48 Cam Follower Holding Link 48F Cam Follower 49 Cam 4 S-springs 50 cover 50B proximal side 50T distal end 51 shaft 52 upstanding section 53 longitudinal groove 54 housing chamber 55 the paper tray 59 pinch 60 an actuator 65 width regulating plate 70 paper transport mechanism 71 and 72 transport rollers

Claims (3)

[Claims] 1. An opening / closing cover having a base end side rotatably held by a main body case for opening and closing an opening of the main body case,
A main body case that includes a paper loading plate whose base end is rotatably held and whose front end is biased by a spring in the direction of the paper feed roller; And a paper feeding device formed so as to be capable of feeding to a printing section inside, a base end side of the paper placing plate is a front end side which is an outside of the main body case when the open / close cover is open. The paper holding plate is rotatably held, and the spring is interposed between the front end side of the paper loading plate and the open / close cover, and the base end side of the paper loading plate is the main body when the open / close cover is open. A printing apparatus, characterized in that it is configured such that the entire sheet placing plate can be housed in the main body case in a closed state by projecting to the outside of the case. 2. A pin provided on the base end side of the paper stacking plate is slidably fitted in a long groove extending in the paper feeding direction when the main body case provided on the front end side of the opening / closing cover is open. A circle formed so as to be inserted into the opening / closing cover so as to be rotatably held by the opening / closing cover, and to approach the opening center of the opening / closing cover from the upper side to the lower side in the main body case. 2. The printing apparatus according to claim 1, wherein an arc-shaped guide groove is provided, and a guide pin that is slidable in the guide groove is provided on the leading end side of the sheet placing plate. 3. An inclined guide surface that is inclined from the upper side to the lower side in the main body case toward the inside of the main body case is provided, and a driven pin that is slidable on the inclined guide surface is provided on the paper sheet mounting plate. It is possible to generate a forcing force that causes the leading end side of the sheet placing plate to approach the opening / closing cover side against the urging force of the spring by using the turning force of the opening / closing cover from the open state to the closed state. The printing apparatus according to claim 2, wherein