JP3778254B2 - Paper cassette loading device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper cassette mounting device in a recording apparatus such as a printer, and particularly when the paper cassette is mounted on an apparatus main body, the paper cassette is maintained in a stable and stable state at a regular position of the paper cassette mounting portion. The present invention relates to a sheet feeding cassette mounting device having a mechanism for causing the sheet feeding mechanism.
[0002]
[Prior art]
Conventionally, in facsimile machines, copiers, printer apparatuses, etc., a paper feed cassette that stores a plurality of paper sheets in a stacked manner is generally used, and paper is fed from this paper feed cassette for recording. Yes.
In order to make the print start position (zero digit) of the recording head coincide with the paper to be fed, it is necessary to make the relationship between the paper feed cassette and the paper and the paper feed cassette and the paper feed cassette mounting portion highly accurate. As countermeasures, the paper feed cassette is provided with a guide member for aligning the paper side edges and a paper rear edge pushing member for reliably separating and feeding the uppermost paper by pushing the paper rear edge. On the other hand, a stopper member is provided in the paper cassette mounting part of the main body of the device. The paper cassette is inserted, and the front wall and side walls of the paper cassette are brought into contact with the stopper member to bring it to the zero digit side. Alignment is performed.
[0003]
[Problems to be solved by the invention]
Conventionally, positioning of the paper feed cassette with respect to the paper feed cassette mounting portion has been performed in two directions on the front wall portion of the paper feed cassette and the side wall portion of the paper feed cassette, but each is configured using a separate spring mechanism. As a result, the structure was complicated. Some devices do not have a mechanism for biasing in two directions. Therefore, when inserting the paper feed cassette, the abutting operation to the stopper member differs depending on the person, so that the paper feed cassette may not be mounted at the normal position, thereby improving the alignment accuracy and separation performance on the zero digit side. There were problems such as lowering.
[0004]
In order to solve the above-described problem, an object of the present invention is provided with a two-stabilizing mechanism for forcibly moving the paper feed cassette to the normal position of the paper feed cassette mounting portion or to the paper feed cassette insertion slot when the paper feed cassette is attached or detached. Another object of the present invention is to provide a sheet feeding cassette mounting device that maintains the sheet feeding cassette at a normal position by the two-stabilization mechanism and can reliably align the recording head in the main scanning direction.
[0005]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a sheet feeding cassette for storing sheets, and a sheet feeding cassette mounting portion into which the sheet feeding cassette is inserted and mounted, and the sheet feeding of the recording apparatus for feeding sheets from the sheet feeding cassette. A cassette mounting device, which is disposed in the paper feed cassette mounting portion and acts in the insertion direction with respect to the paper feed cassette before the inserted paper feed cassette is mounted at a normal position, When the cassette is forcibly moved to the second stable position, which is the regular position, and maintained in a stable state, and the paper cassette is pulled out from the regular position by a predetermined distance, the paper cassette is fed by the paper cassette mounting portion. A bi-stable mechanism that forcibly moves to a first stable position on the cassette insertion opening direction side, and the bi-stable mechanism locks the bi-stable mechanism in a state in which no paper feed cassette is mounted; Lock the paper cassette Characterized in that it comprises a locking mechanism to release the insertion of the sheet cassette mounting portion.
According to the first aspect of the present invention, since the paper feed cassette is reliably set and maintained at the normal position by the two-stabilization mechanism, the paper separation performance is improved and the main scanning direction position of the recording head and the paper feed cassette are improved. The alignment accuracy is improved.
[0006]
Further, according to the first aspect of the invention, since the two-stabilizing mechanism is locked by the lock mechanism when the paper feed cassette is not attached, the state in which the paper feed cassette can be always attached is ensured, and an operator's erroneous operation, etc. Therefore, the operation of the bi-stable mechanism can be prevented, and the reliability is improved.
According to a second aspect of the present invention, there is provided a paper feeding cassette for storing paper, and a paper feeding cassette mounting portion into which the paper feeding cassette is inserted and mounted, and paper feeding of a recording apparatus that feeds paper from the paper feeding cassette. A cassette mounting device, which is disposed in the paper feed cassette mounting portion and acts in the insertion direction with respect to the paper feed cassette before the inserted paper feed cassette is mounted at a normal position, When the cassette is forcibly moved to the second stable position, which is the regular position, and maintained in a stable state, and the paper cassette is pulled out from the regular position by a predetermined distance, the paper cassette is fed by the paper cassette mounting portion. A bi-stable mechanism for forcibly moving to a first stable position on the cassette insertion opening side is provided, the paper feed cassette has a cassette mounting boss, and the 2-stable mechanism is used when the paper feed cassette is inserted. The path of the mounting boss The sheet feeding cassette has an operation member that rotates when the boss connection portion is pushed by a cassette mounting boss, and a rotation that restricts the rotation of the operation member to a predetermined range. A regulating portion, and a rotational force applying member that applies a rotational force to the operating member. The operating member rotates when the operating member rotates beyond an angle within the predetermined range from the first stable position or the second stable position. The action of the force applying member is reversed and forcibly rotated to another stable position, and the paper feed cassette mounting portion includes a cassette front wall stopper that regulates a front wall portion of the paper feed cassette on the paper feed side, and A cassette side wall stopper that regulates the side wall portion is provided, and the rotational force applying member of the bi-stable mechanism uses the force acting on the paper cassette at the second stable position and the component force in the direction perpendicular to the insertion direction of the paper cassette. Each Characterized in that the Tsu path to press the paper feed cassette.
[0007]
According to a third aspect of the present invention, in the first aspect of the present invention, the paper feeding cassette has a cassette mounting boss, and the two-stabilizing mechanism is a bifurcated structure extending across the path of the cassette mounting boss when the paper feeding cassette is inserted. An oscillating member having a boss linking portion having a shape and rotating when the boss linking portion is pushed by the cassette mounting boss, a rotation restricting portion for restricting the rotation of the activating member to a predetermined range, and applying a rotational force to the activating member. A rotation force applying member, and when the actuating member rotates beyond an angle within a predetermined range from the first stable position or the second stable position, the operation of the rotation force applying member is reversed and forced to another stable position. It is characterized in that it can be rotated.
According to the third aspect of the present invention, the operation of the rotational force applying member is reversed to forcibly rotate the operating member to the first stable position and the second stable position, so that the positioning of the paper feed cassette is reliably performed and That state is maintained.
[0008]
According to a fourth aspect of the present invention, in the third aspect of the invention, one end of the rotational force applying member is supported on the operating member opposite to the boss linkage portion of the operating member with the rotational fulcrum of the operating member as a symmetry, and rotates. The other end of the force imparting member is fixed on an extension line on the boss linkage portion side of a line connecting the rotational force imparting member support point and the rotation fulcrum of the actuating member and the boss linkage portion.
According to the invention of claim 4, since the bistable mechanism is operated using a single rotational force applying member, the configuration can be simplified.
[0009]
According to a fifth aspect of the present invention, in the third aspect of the present invention, the lock mechanism includes a lock lever that locks the boss linkage portion of the operation member at the first stable position of the two-stabilization mechanism, and the lock lever in the lock operation direction. An urging member for urging and a boss linkage portion which is provided in the paper feeding cassette, extends in the insertion direction of the paper feeding cassette, and moves between the first stable position and the second stable position of the two-stabilizing mechanism. And a lock lever releasing projection having a length substantially equal to the distance. When the boss linkage is between the first stable position and the second stable position, the lock lever is unlocked by the lock lever releasing projection. It is retained.
According to the invention of claim 5, when the cassette mounting boss of the paper feed cassette is between the first stable position and the second stable position, the lock lever is held in the unlocked state by the lock lever releasing projection. Yes. In other words, the lock mechanism cannot be operated when the paper cassette is mounted, and the lock lever is not released even when an external force such as vibration or impact is applied. Troubles such as being caught can be prevented.
[0010]
According to a sixth aspect of the present invention, in the third or fourth aspect of the present invention, the paper feed cassette mounting portion includes a cassette front wall stopper that regulates a front wall portion on the paper feed side of the paper feed cassette, and a side wall that performs paper side edge alignment. A cassette side wall stopper for regulating the portion, and the rotational force applying member of the two-stabilizing mechanism uses the force acting on the paper feeding cassette at the second stable position and the component force in the direction perpendicular to the insertion direction of the paper feeding cassette. The sheet feeding cassette is pressed against each stopper.
According to the sixth aspect of the present invention, the paper feed cassette can be securely attached to the normal position, and the normal position where the paper feed cassette is abutted against the stopper using the rotational force applying member of the two-stabilization mechanism. In addition, the side wall portion that aligns the paper side edges can be aligned with the main scanning direction position of the recording head. With such a simple configuration, it is possible to improve sheet separation performance and sheet feeding accuracy.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described. FIG. 1 is a perspective view of a printer apparatus to which a paper cassette mounting apparatus according to the present invention is applied, with a cover removed, and FIG. 2 is a schematic view of the paper feeder in the printer apparatus.
[0012]
First, an outline of the printer apparatus will be described. The printer apparatus 1 includes a sheet cassette mounting portion 2 provided with a sheet cassette insertion slot 2A on the front side of the apparatus main body, and supplies a plurality of sheets P stacked from the sheet cassette insertion slot 2A. A paper cassette 20 is inserted and mounted. A main frame 110 erected on the bottom frame 40 includes a main shaft 112 that supports a carriage 111 on which the recording head 12 is mounted so as to be movable in the main scanning direction, a carriage 113 that includes a motor 113 and a belt 114 that drive the carriage 111. 115, a paper feeding unit 116, a paper feeding unit 117, and a carriage home station 118 for performing maintenance such as cleaning of the recording head 12 and ink suction are provided at the rear of the apparatus main body.
[0013]
As shown in FIG. 2, a push plate operating lever 3 having a rotation fulcrum 3 a is arranged in the paper feed cassette mounting portion 2 so as to extend to the vicinity of the paper feed roller 6. The push plate operating lever 3 is urged toward the paper feed roller 6 by a spring (not shown). When the cam 5a of the cam body 5 attached to the release shaft 4 acts on the cam follower 3b provided on the push plate operation lever 3, the push plate operation lever 3 moves the push plate 21 upward in the drawing every time the paper P is fed. The actuator is operated to a pushed-up position (paper feeding state) and a position pushed down from the position (non-paper feeding state). That is, when the release shaft 4 is rotated by the start of paper feeding, the pad 6B is pressed against the paper feeding roller 6, and the push plate 21 that rotates about the push plate shaft 24 is pushed up to the paper feeding roller 6 side by the operation lever 3. Then, the leading edge of the upper layer is pressed against the paper feed roller 6.
[0014]
The sheets P on the upper layer side of the sheet feeding cassette 20 are separated one by one by the pad 6B, fed by the sheet feeding roller 6, guided by the sheet guide roller 7 and the sheet guiding unit 8, and detected by the sheet detector 9. Is sent to a conveyance unit 116 composed of the conveyance roller 10 and the driven roller 11. Subsequently, the drive control of the transport roller 10 is performed based on the paper detection to cue the paper P, and the paper P is transported to a recording area composed of the recording head 12 and the platen 13 in accordance with the recording timing. Will be discharged.
[0015]
Next, a paper cassette mounting apparatus according to the present invention applied to the above-described printer apparatus will be described in detail. 3 is a perspective view of the sheet cassette in the sheet cassette mounting apparatus according to the present invention as viewed from the sheet storage unit side, FIG. 4 is a view taken along the line II in FIG. 3, and FIG. 5 is a plan view of the sheet cassette. 6 is a rear view of the paper feed cassette, and FIG. 7 is a rear view of the paper feed cassette with the back cover removed.
[0016]
In FIG. 3, the paper feed cassette 20 forms a box-shaped container by a bottom plate portion 22 and side wall portions 23 provided on the front and rear sides and the left and right sides of the bottom plate portion 22. A push plate 21 that pushes up the stacked paper P toward the paper feed roller 6 is disposed on the front side of the paper feed cassette 20, and the push plate 21 rotates the push plate shaft 24 to the bearing portion 25 of the bottom plate portion 22. It is supported so as to be movable, and the side wall portion in front of the sheet feeding cassette 20 can move upward.
[0017]
On the rear side of the paper feed cassette 20, a pair of paper rear end abutting members 26 having contact portions 26 a that abut against the rear end of the stacked paper P are provided in parallel and spaced apart in the side wall direction. As shown in FIG. 6, the rear surface of the paper feed cassette 20 is located on the push plate 21 side, and is provided with a lock lever operating projection 210 and a cassette mounting boss 220 for a bi-stable mechanism and a lock mechanism which will be described later. . Behind that, the mechanical parts of the paper trailing edge abutting member 26 and the paper side edge aligning member 27 are disposed, and a back cover 38 is attached to cover the mechanical parts.
[0018]
In FIG. 7, the paper trailing edge contact member 26 is connected to a slide plate 261 movably disposed on the back of the cassette, and a spring 262 is stretched between the slide plate 261 and the back of the cassette. The paper cassette 20 is biased toward the front side. The contact portion 26 a of the sheet rear end abutting member 26 has a contact surface inclined toward the rear side of the sheet feeding cassette 20 toward the bottom plate portion 22, and this contact surface is caused by the biasing force of the spring 262. To. As a result, the sheet P is pushed forward from the lower side to the lower layer side on the bottom plate side from the upper layer side, and is pressed against the side wall portion 23 of the front portion of the sheet feeding cassette 20 to feed the sheet feeding roller 6 and the pad 6B. Are fed one by one from the upper layer side.
[0019]
As shown in FIG. 5, a sheet side edge aligning member 27 is arranged on one side wall side of the sheet feeding cassette 20 to push one side edge of the sheet P and align the sheet side edge with the opposite side wall part. Yes. The sheet side edge aligning member 27 includes a first pressing portion 27A and a second pressing portion 27B, and is disposed along the side wall portion. One end of each of the first push portion 27A and the second push portion 27B is linked to a bar 31 provided on the back surface of the paper feed cassette 20 to constitute a substantially intermediate portion of the paper side edge aligning member 27, and The other ends of the push portions 27A and 27B are rotatably supported by the bottom plate portion 22. One end sides of the first push portion 27A and the second push portion 27B are urged toward a side wall portion where the paper side ends are aligned by an urging mechanism 30 disposed on the back side of the paper feed cassette 20. .
[0020]
The urging mechanism 30 includes a bar 31, a movable plate 32, and springs 33, 34, and 35 as shown in FIG. The bar 31 is connected to one end side of the first push portion 27 </ b> A and the second push portion 27 </ b> B, and is attached so as to be rotatable along the side wall portion of the paper feed cassette 20. The movable plate 32 is provided so as to be slidable in a direction perpendicular to the insertion direction of the paper feed cassette 20 and has a paper alignment boss 36 a on the side wall portion opposite to the side wall portion of the paper feed cassette 20. The plate 36 is integrally connected. The widened portion 36b of the boss plate 36 is guided by a plate guide portion 37 formed on the back surface of the paper feed cassette 20, and the movement of the boss plate 36 toward the bar 31 is restricted by hitting the L-shaped portion at the tip.
[0021]
A spring 33 is stretched between the bottom plate portion 22 and the movable plate 32, and a plurality of springs 34 and 35 are stretched between the bar 31 and the movable plate 32, respectively. As illustrated, the spring 33 holds the movable plate 32 by abutting the boss plate 36 against the L-shaped portion of the plate guide portion 37. At this time, the bar 31 is prevented from moving inwardly pushing the paper side edge by the extending portion 32a of the movable plate 32, and the springs 34 and 35 do not act on the bar 31. In the position shown in FIG. 5, it can be moved only outward. Since the interval between the sheet side edge aligning member 27 and the side wall portion on the sheet side end aligned side is set slightly wider than the sheet width, in the state shown in FIG. Never become.
[0022]
When the paper feed cassette 20 is mounted on the paper feed cassette mounting portion 2, the load due to the springs 34 and 35 acts by a combination of 1 or 2 in the process of inserting the paper feed cassette 20. The cam mechanism for this purpose comprises a sheet aligning boss 36a of the boss plate 36 and a rectangular groove cam 41 (see FIG. 8) provided on the bottom frame 40 of the sheet feeding cassette mounting portion 2.
[0023]
When the paper feeding cassette 20 is inserted into the paper feeding cassette mounting portion 2, the paper aligning boss 36a is guided in contact with the cam surface 41a of the groove cam 41 as shown in FIG. The paper side edge is pushed by the aligning member 27. This pushing force acts from (1) to (2) in FIG. When the paper feed cassette 20 is further inserted, the spring 34 is activated, and the paper side end is pushed by the combined load with the spring 33 to align with the side wall portion on the opposite side of the paper feed cassette 20. This pressing force acts between (2) to (4) in FIG. 8 and becomes the largest at the position (3). The spring 35 does not work between (4) and (5), and the paper side edge is pushed only by the spring 34 and the aligned state is maintained.
[0024]
By configuring the urging mechanism with the plurality of springs 34 and 35 in this manner, the force applied in the direction perpendicular to the insertion direction, which becomes a resistance when the paper feed cassette 20 is mounted, is minimized, that is, the paper side edges are aligned. You can use the power you need only when you need it.
[0025]
Since the paper feed cassette of this embodiment is compatible with paper having slightly different vertical and horizontal sizes such as A4 size and letter size, the arrangement of the paper trailing edge contact member 26 and the paper side edge aligning member 27 is changed as shown in FIG. For this purpose, a paper rear end abutting member mounting hole 28 and a paper side edge aligning member mounting hole 29 are formed. For the arrangement of the sheet trailing edge contact member 26 and the sheet side edge aligning member 27 for various sheet sizes, for example, in the case of A4 size sheets, the mounting holes at the positions shown in FIG. The mounting holes 28 and 29 indicated by the reference numerals in the inside are used respectively.
[0026]
Next, a mechanism for mounting the paper feed cassette at the normal position of the printer main body will be described. FIG. 8 is a plan view of the bottom frame 40 of the paper cassette mounting unit, and FIG. 9 is a rear view showing the relationship between the bottom frame 40 of the paper cassette mounting unit and the paper cassette 20.
[0027]
First, the configuration of the paper feed cassette relating to the paper feed cassette mounting apparatus according to the present invention will be described. Note that the overall configuration of the paper feed cassette will be described with reference to FIGS.
[0028]
On the rear surface of the bottom plate portion 22 of the paper feed cassette 20, a rib-shaped lock lever operating projection 210 extending in the direction of insertion into the printer main body and a cassette mounting boss 220 at the approximate center in the width direction of the paper feed cassette 20 are shown. As shown in FIG. 6, the push plate 21 is provided in the same row as the bearing portion 25 and integrally therewith. The front end of the lock lever operating projection 210 is positioned further to the front side of the paper feed cassette 20 than the cassette mounting boss 220 is.
[0029]
On the other hand, a bottom frame 40 for guiding insertion of the paper feed cassette 20 is provided in the paper feed cassette mounting portion 2 of the printer main body 1. In FIG. 9, the bottom frame 40 is provided with a bistable mechanism 50 that operates when the paper feed cassette 20 is inserted. A boss slit 42 related to the cassette mounting boss 220 and a protrusion slit 43 related to the lock lever operation protrusion 210 are formed on the insertion side of the paper feed cassette 20 in the bottom frame 40. 43, the insertion side of the paper feed cassette 20 is open.
[0030]
A bistable operation member 52 having a boss linking portion 51 disposed across the boss slit 42 is rotatably provided on the bottom frame 40 opposite to the projection slit 43 with respect to the boss slit 42. Yes. The boss linkage 51 has a bifurcated structure consisting of a parallel short piece 51a and a long piece 51b extending from the base 53. The short piece 51a is on the front side of the cassette mounting boss 220 and the long side is on the far side. The piece 51b is located.
[0031]
Between the base portion 53 and the bottom frame 40, the boss linkage portion 51 has a first stable position (position shown in FIG. 9) before the paper feed cassette 20 is attached and a second stable position (position shown in FIG. 12) after the attachment. A rotation restricting portion is provided to enable rotation within the range. As shown in FIG. 8, the rotation restricting portion includes an arcuate slit 44 provided in the bottom frame 40 around the rotation fulcrum of the base 53 and a restriction provided in the base 53 that can move in the slit 44. It consists of a piece 54.
[0032]
A toggle mechanism is provided for maintaining the boss linkage 51 in the above-described two positions in a stable state. In the toggle mechanism, one end of the spring 55 is hooked to the base 53 opposite to the boss linkage 51 and away from the rotation center, and the other end is hooked to the bottom frame 40 outside the projection slit 43. When the boss linkage 51 swings in any direction with the rotation center of the base 53 on the line connecting the spring latching position of the base 53 and the spring latching position of the bottom frame 40, A spring force acts on the rotation of the base 53, and the base 53 is rotated at a stroke to the second stable position where the paper feed cassette 20 is abutted against the stopper 58.
[0033]
A lock mechanism is provided that stops the movement of the boss linkage 51 when the boss linkage 51 is in the first stable position. The lock mechanism includes a lock lever 56 rotatably supported on the bottom frame 40 between the boss slit 42 and the projection slit 43, and a long piece 51b of the boss linkage 51 in the first stable position. It consists of a spring 57 that rotates the lock lever 56 to prevent movement towards the position.
[0034]
The lock lever 56 has a lock release piece 56 a that crosses the protrusion slit 43, and the lock release piece 56 a is positioned so as to abut against the lock lever operation protrusion 210 of the sheet cassette 20, and further, the lock lever operation protrusion 210. Release action when entering. That is, when the lock lever operating projection 210 pushes the lock release piece 56a in the cassette insertion direction, the lock lever 56 is rotated against the urging force of the spring 57 to lock the boss linkage 51 with the long piece 51b. Remove and unlock.
[0035]
When the lock is released, the long piece 51b of the boss linkage 51 can be pushed by the entry of the cassette mounting boss 220 of the paper feed cassette 20. Reference numeral 58 denotes a stopper for positioning the corners on both sides in front of the paper feed cassette 20 in order to mount the paper feed cassette 20 at the normal position of the paper feed cassette mounting portion. Reference numeral 59 denotes a lock lever 56 provided on the bottom frame 40. This is a rotation restricting portion.
[0036]
The operation of the paper cassette mounting apparatus of this embodiment will be described with reference to FIGS. When the paper feed cassette 20 is inserted into the paper feed cassette insertion slot 2A, the paper aligning boss 36a, the lock lever operating protrusion 210, and the cassette mounting boss 220 are the groove cam 41, the boss slit 42, and the protrusion for the bottom frame 40. Each enters the slit 43 (FIG. 9). Note that the sheet side edge aligning operation by the sheet aligning boss 36a and the groove cam 41 has been described above, and is therefore omitted here.
[0037]
First, the lock lever operating projection 210 reaches the lock release piece 56a of the lock lever 56, and the lock lever 56 is rotated in the direction of the arrow against the urging force of the spring 57 to release the lock (FIG. 10). At this time, the cassette mounting boss 220 reaches the boss linkage 51 of the bistable operation member 52. When the sheet feeding cassette 20 is further inserted, the unlocking state of the lock lever 56 is maintained by the lock lever operation projection 210, and the cassette mounting boss 220 pushes the long piece 51b of the boss linkage 51, and the two-stable actuating member 52. Is rotated against the action of the spring 55 (FIG. 11). When the rotation of the bistable operation member 52 exceeds the position shown in FIG. 11, the action of the spring 55 on the bistable operation member 52 is reversed, and the short piece 51a of the boss linkage 51 pushes the cassette mounting boss 220, 20 is moved to the normal position at a stretch and abuts against the stopper 58 (FIG. 12).
[0038]
When pulling out the paper feed cassette 20 from the printer main body, the cassette mounting boss 220 moves from the state shown in FIG. 12 to the paper feed cassette insertion slot while pressing the short piece 51a of the boss linkage portion 51. The action of 55 is reversed, and the bistable operation member 52 rotates from the FIG. 11 to the first stable position of FIG. When the sheet feeding cassette 20 is further pulled out, the lock lever operating projection 210 is separated from the unlocking piece 56a of the lock lever 56, and the lock lever 56 is rotated toward the boss linkage 51 by the urging force of the spring 57, so that the boss linkage The long piece 51b of 51 is latched and locked.
Thus, by locking the bistable operation member 52 at the first stable position, the state in which the paper feed cassette 20 can be mounted is always secured when the paper feed cassette 20 is not mounted, and the reliability is improved.
[0039]
The operation of the spring 55 in a state where the paper feed cassette 20 is abutted against the stopper 58 will be described with reference to FIG. The force F acting on the paper feed cassette 20 via the cassette mounting boss 220 at the second stable position shown in the drawing is directed to the paper side edge alignment side, and the force F1 in the insertion direction of the paper feed cassette 20 A component force is generated in the force F2 in the direction of one side wall. The front wall portion of the paper feed cassette 20 is pressed against the stopper 58 disposed on the front wall portion of the paper feed cassette 20 using this component force F1. On the other hand, the side wall portion of the sheet feeding cassette 20 is pressed against the second stopper 58b disposed on the sheet side edge alignment side by the component force F2.
Such a bi-stable mechanism can reliably mount the paper cassette 20 in the normal position, and the spring 55 of the bi-stable mechanism can be used to push the paper cassette 20 into the stopper 58 and the second stopper 58b. The normal position can be stably maintained, and the configuration can be simplified.
[0040]
In the description of the embodiment of the present invention, a description has been given of a configuration in which a single coil spring is used as a rotational force applying member that applies a rotational force to the bistable operation member 52. You can also.
[0041]
【The invention's effect】
According to the present invention, since the paper cassette is reliably set and maintained at the normal position by the two-stabilization mechanism, the paper separation performance is improved and the paper cassette is aligned with the zero digit side of the recording head. Accuracy is improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of a printer apparatus to which a paper feed cassette mounting apparatus according to the present invention is applied.
FIG. 2 is a schematic diagram of a paper feeding device in a printer device.
FIG. 3 is a perspective view of the paper feed cassette in the paper cassette mounting apparatus according to the present invention as viewed from the paper storage unit side.
4 is a view taken in the direction of arrows I-I in FIG. 3;
FIG. 5 is a plan view of a paper feed cassette in the paper feed cassette mounting apparatus according to the present invention. ,
FIG. 6 is a rear view of the paper feed cassette in the paper feed cassette mounting device according to the present invention.
7 is a rear view of the paper feed cassette with the back cover of FIG. 6 removed.
FIG. 8 is a diagram illustrating a relationship between a sheet alignment boss and a groove cam.
FIG. 9 is a diagram illustrating a relationship between a frame of a paper feed cassette mounting unit and a paper feed cassette.
FIG. 10 is an explanatory diagram of a release operation in the lock mechanism.
FIG. 11 is an explanatory diagram of the reversal operation of the spring action in the bi-stable mechanism.
FIG. 12 is an explanatory diagram of a state where a paper feed cassette is completely installed.
FIG. 13 is an explanatory diagram of a positioning operation of a paper feeding cassette using a spring of a bi-stable mechanism.
[Explanation of symbols]
1 Printer device
2 Paper cassette mounting part
20 Paper cassette
40 Bottom frame of paper cassette mounting part
50 2 Stabilization mechanism
51 Boss Link
52 Two stable operation members
55 Spring (Rotating force applying member)
56 Lock lever
56a Unlocking piece
58 Stopper (Cassette front wall stopper)
58b Second stopper (cassette side wall stopper)
210 Lock lever operation protrusion
220 Boss for cassette mounting
P paper

Claims (6)

A paper feed cassette mounting device of a recording apparatus that has a paper feed cassette for storing paper and a paper feed cassette mounting portion into which the paper feed cassette is inserted and mounted;
The sheet feeding cassette is disposed in the sheet feeding cassette mounting portion and acts in the inserting direction with respect to the sheet feeding cassette before the inserted sheet feeding cassette is mounted at the regular position. Forcefully move to the second stable position and maintain in a stable state,
A bi-stable mechanism for forcibly moving the paper cassette to a first stable position on the side of the paper cassette loading portion of the paper cassette mounting portion when the paper cassette is pulled out from the normal position by a predetermined distance; ,
A lock mechanism is provided for locking the bistable mechanism in a state where the bistable mechanism is not mounted with a paper cassette, and for releasing the locked state by inserting the paper cassette into the paper cassette mounting portion. A sheet feeding cassette mounting device characterized by comprising: A paper feed cassette mounting device of a recording apparatus that has a paper feed cassette for storing paper and a paper feed cassette mounting portion into which the paper feed cassette is inserted and mounted;
The sheet feeding cassette is disposed in the sheet feeding cassette mounting portion and acts in the inserting direction with respect to the sheet feeding cassette before the inserted sheet feeding cassette is mounted at the regular position. Forcefully move to the second stable position and maintain in a stable state,
A bi-stable mechanism for forcibly moving the paper cassette to a first stable position on the side of the paper cassette loading portion of the paper cassette mounting portion when the paper cassette is pulled out from the normal position by a predetermined distance; ,
The paper feed cassette has a cassette mounting boss, and the bi-stable mechanism has a bifurcated boss linkage extending across the path of the cassette mounting boss when the paper feed cassette is inserted, The cassette has an operating member that rotates when the boss linkage is pushed by the cassette mounting boss, a rotation restricting portion that restricts the rotation of the operating member to a predetermined range, and a rotational force applying member that applies a rotational force to the operating member, With
When the operating member rotates beyond a certain angle within the predetermined range from the first stable position or the second stable position, the action of the rotational force applying member is reversed and forcedly rotated to another stable position,
The paper feed cassette mounting portion includes a cassette front wall stopper that regulates a front wall portion of the paper feed cassette on a paper feeding side and a cassette side wall stopper that regulates a side wall portion. 2. A sheet feeding cassette mounting device that presses the sheet feeding cassette against each of the stoppers using a force that acts on the sheet feeding cassette at a stable position in a direction perpendicular to the insertion direction of the sheet feeding cassette. . 2. The paper feed cassette according to claim 1, wherein the paper feed cassette has a cassette mounting boss, and the two-stabilizing mechanism has a bifurcated boss linkage extending across the path of the cassette mounting boss when the paper feed cassette is inserted. The sheet feeding cassette has an operating member that rotates when a boss linkage is pushed by a cassette mounting boss, a rotation restricting portion that restricts rotation of the operating member within a predetermined range, and a rotational force that applies a rotational force to the operating member. An imparting member,
When the operating member rotates beyond a certain angle within the predetermined range from the first stable position or the second stable position, the action of the rotational force applying member is reversed and is forcedly rotated to another stable position. A paper cassette mounting device characterized by this.   4. The rotating force applying member according to claim 3, wherein one end of the rotational force applying member is supported on the operating member opposite to the boss linkage portion of the operating member with the rotational fulcrum of the operating member being symmetrical, A sheet feeding cassette mounting device, characterized in that it is fixed on an extension line on the boss linkage portion side of a line connecting a rotation force applying member support point of the actuating member, a rotation fulcrum and a boss linkage portion. 4. The lock mechanism according to claim 3, wherein the lock mechanism includes a lock lever that locks the boss linkage portion of the operating member at the first stable position of the two-stabilizing mechanism, and a biasing member that biases the lock lever in the lock operating direction. A length that is provided in the paper feed cassette, extends in the insertion direction of the paper feed cassette, and is substantially equal to the distance that the boss linkage moves between the first stable position and the second stable position of the second stabilizing mechanism. A lock lever release projection having a thickness,
The paper feed cassette mounting device, wherein the lock lever is held in an unlocked state by the lock lever releasing projection when the boss linkage is between the first stable position and the second stable position. .   5. The paper feed cassette mounting portion according to claim 3, further comprising a cassette front wall stopper for regulating a front wall portion of the paper feed cassette on a paper feeding side and a cassette side wall stopper for regulating the side wall portion. The rotational force applying member of the mechanism presses the paper feed cassette against each of the stoppers by using the force acting on the paper feed cassette in the second stable position and the component force in the direction perpendicular to the insertion direction of the paper feed cassette. Characteristic paper cassette loading device.

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