KR101525775B1 - Cassette used in cash transaction machine - Google Patents

Abstract

The present invention discloses a medium storage device for a financial automatic machine. A media storage device of a financial automation apparatus according to the present invention includes a push plate coupled to a belt installed at a bottom portion to press a paper medium and to be moved forward or backward together with a belt, Wherein the push plate includes a retreat limit lock which is engaged with the concave and convex portion to limit the retraction of the push plate and a retreat limit releasing lock that releases the engagement of the concave and convex portion and restrains the retraction of the push plate, .

Body, knob, rear cover

Description

{CASSETTE USED IN CASH TRANSACTION MACHINE}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a financial automatic machine, and more particularly, to a financial automatic machine having a media storage device in which a backward lock releasing means capable of releasing a backward limit lock of a push plate .

Financial automation equipment is an automation device that can provide basic financial services such as deposit or withdrawal without regard to time and place and bank staff without regard to financial services.

Financial automation equipment can be divided into cash dispenser and cash dispenser depending on whether or not to deposit or withdraw money. In recent years, the automated teller machine has been used for various purposes such as check deposit / withdrawal, bankbook payment, have.

Generally, a financial automation device picks up and transports a paper medium from a media storage device by using a pick-up module, and the transferred paper medium is immediately moved to a withdrawal portion or temporarily stored in a temporary stack portion and then moved to a withdrawal portion. When the temporary stack unit is used, the paper medium can be provided to the customer in stack units.

Meanwhile, the media storage device is provided with a push plate for pushing and pressing the paper medium loaded toward the pickup module. In a state where the media storage device is separated from the financial automation device, the push plate is moved in the opposite direction The paper medium loaded in the pressurized state may be disturbed in the media storage device, which may interfere with the operation of the push plate.

Therefore, a device for preventing the push plate from moving in the direction opposite to the direction of pushing the paper medium is used although the push plate can move without restraint in the direction of pressing the paper medium.

However, in order to fill the paper storage medium with the paper storage medium or to remove the paper storage medium from the storage medium, the push plate must be retracted in the direction opposite to the pressing direction. At this time, in order to easily pull out the paper medium which is in a state of being pressurized by the push plate, it is necessary to easily release the backward limit lock of the push plate so as to forcibly retract the push plate.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and it is an object of the present invention to provide a media storage device for a financial automatic machine, which can easily release a restraint state of a retreat limit lock for preventing retraction of a push plate.

The present invention provides a media storage device for a financial automatic machine capable of simultaneously performing release of a restraint state of a retreat limit lock of a push plate and forcible retraction of a push plate.

According to an aspect of the present invention, there is provided a paper cassette comprising: a base having a bottom portion on which a paper medium is loaded; a base cassette accommodating the base therein; and a cassette cover for opening and closing the base cassette, A media storage device for an automation machine, the media storage device comprising: a push plate coupled to a belt installed at the bottom portion to press a paper medium and advance or retract with the circulation of the belt; and a push plate formed on the bottom portion to be parallel to the belt, Wherein the push plate is engaged with the concave / convex portion to release a retreat limit lock that restricts retraction of the push plate, and a retracted state of the retreat limit lock and the concave / convex portion to retract the push plate And a withdrawal lock releasing means It is possible to provide a media storage apparatus.

By constituting as described above, the push plate can be retracted and released to retract the push plate.

Wherein the backward lock releasing means includes a main body to which a pressurizing portion for pressing a paper medium is mounted and which is fastened and fixed to the belt, a knob provided behind the main body and provided with the retreat limit lock, And the restricting state of the recessed restricting portion and the recessed portion can be released as the knob rotates toward the rear cover. That is, by pushing the knob in the retracting direction of the push plate, it is possible to release the push-back of the push plate and retract the push plate at once.

Wherein the knob comprises a lock receiving portion for receiving the retreat limit lock, a pivot portion provided between the main body portion and the rear cover formed behind the lock receiving portion to enable rotation of the knob, And a pressing part formed on both sides of the elastic member mounting part for rotating the knob toward the rear cover. The elastic member mounting part may be provided on the elastic member mounting part.

Wherein the rear cover includes an elastic member support portion that is spaced apart from the elastic member mounting portion and is bent to be positioned on an upper portion of the elastic member mounting portion and a rear cover body that supports the rear portion of the knob, An inclined surface may be formed. Thus, by forming the inclined surface on the rear cover, not only the rotation range of the knob can be limited, but also the push plate can be retracted while the rotation of the knob is maintained.

The elastic member may be disposed between the elastic member mounting portion and the elastic member supporting portion to support the rotational motion of the knob. That is, since the elastic member is deformed by the elastic member mounting portion and the elastic member supporting portion as the knob rotates, when the push plate is retracted to a desired position and then the knob is released, the knob can be easily returned to the original state.

Wherein the retraction limit lock is rotatably mounted on the knob, and one end of the retraction limit lock is provided with a locking portion that is constrained to the concave / convex portion, and as the knob rotates toward the rear cover, Can be released. At this time, since the extent of the rising of the engaging portion is sufficient to prevent the end of the engaging portion from being caught by the uneven portion, it is not necessary to raise the engaging portion much.

The knob may rotate until it contacts the sloped floor surface, and the main body is provided in front of the recessed restricting lock to prevent rotation of the locking part during its lifting. If the locking part is rotated, the locking part and the concave / convex part may not be constrained even if the knob returns to the initial state.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, since the lock that restricts the movement of the push plate can be easily released, the push plate can be retracted without applying a large force.

The present invention can conveniently take out the paper medium from the media storage device or insert the paper medium into the media storage device since the release of the push plate backward lock state and the retraction of the push plate can be performed in a single operation.

 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a configuration and operation according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE INVENTION The following description is one of many aspects of the claimed invention and the following description forms part of a detailed description of the present invention.

In the following description, well-known functions or constructions are not described in detail for the sake of clarity and conciseness.

1 is a side view for explaining a financial automatic machine of the present invention.

1, the automated teller machine 100 according to an embodiment of the present invention includes a media storage 200 mounted in a housing 110 to receive a paper medium, a medium transferring device 130, A carriage 140, a carriage 150, and a carriage transfer unit 170 for transferring the carriage.

The paper medium is picked up and supplied in a unit of a unit in the medium storage device 200 by the pickup module 125 located on the upper side of the medium storage device 200, And is transferred to the stack unit 140. The paper medium supplied in a sheet unit is accumulated in the temporary stack unit 140. When a number of paper mediums to be withdrawn by the customer is stacked, the paper medium bundle or stack of the temporary stack unit 140 is stacked on the carriage 150). The paper media stack transferred to the carriage 150 moves to the media outlet 115 along with the carriage 150 and at the media outlet 115 the customer can receive the paper media in stack units.

At this time, the carriage transfer unit 170 can transfer the carriage 150 while pressing the upper surface of the paper media stack conveyed by the carriage 150.

The pickup module 125 is mounted on the media storage 200 and the pickup module 125 can pick up a predetermined number of paper media from the media storage 200.

The temporary stack section 140 includes a support table 142, a front bulkhead 144, a rear bulkhead 143, and stack up and down sections 146 and 148. Here, the stack lifting portion includes a rotation support 146 and a rotation guide 148 that functions as a cam. The support base 142 can move up and down through the pivotal motion of the rotation support 146. And a stack drive unit (not shown) such as a motor for driving the rotation guide 148. [

A helical guide groove 149 having a different radius according to the rotation angle may be formed in the rotation guide 148. A projection 147 coupled to the guide groove may be formed on the rotation support 146. [ Accordingly, when the rotation guide 148 rotates in the clockwise direction with respect to the drawing, the rotation support 146 is raised. Conversely, when the rotation guide 148 rotates counterclockwise, the rotation support 146 is lowered.

The carriage 150 is provided with a structure that can partially overlap with the support 142 of the temporary stack portion 140 and may be provided in a fork shape having a plurality of supports in general.

When the support 142 rises upward, the carriage 150 moves forward, and the lower portion of the carriage 150 is inserted into the support 142 to be positioned below the paper medium.

In addition, a carriage transfer portion 170 is provided on the upper side or both sides of the carriage 150. The carriage transfer unit 170 is for pressing the top surface of the paper medium or the stack at the same time as the carriage 150 is conveyed, so that the paper medium can be transferred smoothly without disturbance.

To this end, the carriage transfer unit 170 includes a belt 172 for transferring the carriage 150 between the moving full length of the carriage 150 and for pressing the upper surface of the paper medium, The front fixing roller 173, the rear fixing roller 174, and the front fixing roller 173, and can be pivoted up and down. A support 176 may be interposed between the forward movement roller 175 and the front fixing roller 173. The belt 172 may be provided in two or more rows so as to stably press the paper medium.

1, it is preferable that the belt 172 is inclined downward along the advancing direction of the carriage 150 or with respect to a horizontal line (see the one-dot chain line L-L). The force to transfer the stack of paper media to the media outlet 115 is the driving force of the carriage 150 and the belt 172 and the belt 172 also serves to press the top surface of the paper medium.

When the paper medium that has not been withdrawn or received by the customer remains on the carriage 150, the paper medium must be separated from the carriage 150 and recovered. To this end, the paper medium is pivotally moved in the advancing direction of the carriage 150 A stopper 180 may be formed on the conveyance path of the carriage 150. The paper medium loaded on the carriage 150 is not caught by the stopper 180 when the carriage 150 advances and the paper medium loaded on the carriage 150 is moved to the stopper 180 when the carriage 150 is retracted So that the paper medium is separated from the carriage 150.

Hereinafter, the media storage device 200 of the automated teller machine 100 according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a perspective view illustrating a media storage device of the automated teller machine according to FIG. 1, and FIG. 3 is a perspective view showing the internal structure of the media storage device according to FIG.

Referring to Figure 2, the media storage device 200 includes a base 215 for receiving paper media, a base cassette 210 for receiving the base therein, a cassette cover (not shown) for opening and closing the open top of the base cassette 210 The main body side of the automatic teller machine 100 for opening and closing the cassette shutter 230 and the cassette shutter 230 mounted on the cassette cover 210 for opening and closing an opening (not shown) of the cassette cover 220, And a lock lever 160 mounted on the lock lever 160.

The base 215 and the base 215 may be separately formed or integrally formed.

The internal structure of the media storage device 200 will be described below in the case where the base 215 and the base cassette 210 are separately formed.

3, the media storage device 200 according to the present invention includes a base 215 having a bottom portion F on which a paper medium is loaded, a base cassette 210 for accommodating the base 215 therein, And a cassette cover 220 (see FIG. 2) for opening and closing the base cassette 210.

The base 215 has a substantially opened rectangular parallelepiped shape so that the paper medium can be loaded and the paper medium can be evenly loaded inside the base 215 while the long side of the paper medium contacts the bottom portion F. [

A pressing portion 241 and a pressing portion 241 for pressing the paper medium loaded along the longitudinal direction of the paper medium to the front portion 211 of the base 215 are mounted inside the base 215 A push plate 240 including a body portion 250 is provided. On the other hand, a media side guide 214 for supporting the short side of the paper medium may be provided near the longitudinal side wall of the base 215.

The body portion 250 of the push plate 240 is fixed to the belt 212 and the belt 212 is fixed to the belt 212. [ With the circulation of < / RTI > As the belt 212, a timing belt or the like can be used.

The body portion 250 may include a belt engagement portion 252 for securing the push plate 240 to the belt 212. Here, it is preferable that two belts 212 are formed in parallel, and the belt engaging portion 252 may be formed in two locations in order to evenly pressurize and transport the paper medium loaded on the base 215.

A concave and convex portion 216 formed on the bottom portion F to be parallel to the belt 212 and capable of advancing the push plate 240 but blocking retraction can be formed on the bottom portion F of the base 215 have. The concave and convex portion 216 may be formed over the entire length of the bottom portion F of the base 215 in parallel with the belt 212.

On the other hand, the push plate 240 tends to move forward to always press the paper medium by the push plate spring.

Hereinafter, with reference to the drawings, a recess portion or a lock releasing means (LRM) of the push plate 240 will be described. Fig. 4 is a perspective view showing the recess of the push plate according to Fig. 3, Fig. 5 is a side view of the push plate recess according to Fig. 4, Fig. 6 is an exploded perspective view of the push plate recess according to Fig. And is a perspective view showing the inside of the push plate recess.

4 to 6, the push plate 240 of the media storage device 200 according to the present invention includes a push plate 240 for releasing the retract limit lock to limit the retraction of the push plate 240, (LRM), which can be said to be part of the push plate (240).

The retracting and unlocking means LRM is configured to release the retraction limit lock 271 and the retraction limit lock 271 and the recessed portion 216 that are caught by the recessed portion 216 to limit the retraction movement of the push plate 240 So that the push plate 240 can be retracted.

By constituting as described above, the push plate 240 can be forcedly or artificially released and the push plate 240 can be retracted.

The backlash unlocking means LRM includes a main body portion 250 which is in contact with the paper medium and is fixed to the belt 212 by a pressing portion 241 for pressing the paper medium toward the base front portion 211 A knob 260 provided at the rear of the main body 250 and equipped with a retreat limit lock 271 and a rear cover 280 mounted at the rear of the knob 260 and supporting the rotation of the knob 260 .

Here, the pressing portion 241 is formed separately from the body portion 250, or may be integrally formed. When the pressing portion 241 is formed separately from the main body 250, the pressing portion 241 can adjust the height of the pressing portion 241 mounted on the main body 250 according to the size or type of the paper medium to be loaded. A height adjustment slot 243 (see FIG. 3) formed in a predetermined length in the vertical direction may be formed in the pressing portion 241. A plurality of height adjusting protrusions 254 for selecting a mounting height of the pressing portion 241 are formed in the body portion 250. The height adjusting protrusions 254 are aligned with the height adjusting protrusions 254, The body portion 250 and the pressing portion 241 can be engaged with each other.

A belt engaging projection 253 for engaging and fixing the push plate 240 to the belt 212 is formed at a lower portion of the main body 250. The belt engaging projection 253 is disposed in the belt engaging portion 252 .

The knob 260 provided at the rear of the main body 250 is formed at the rear of the lock receiving portion 266 and the main receiving portion 266 for accommodating the retreat limit lock 271, A pivot portion 268 provided between the rear cover 280 and the knob 260 to allow the knob 260 to rotate, And a pressing portion 262 formed on both sides of the elastic member mounting portion 269 and the elastic member mounting portion 269 to which the knob 260 is provided and for rotating the knob 260 toward the rear cover 280. [

The knob 260 is a portion directly operated by the user to release the lock state of the push plate 240 and to retract or retract the push plate 240. That is, the user can retract the push plate 240 by pushing the push portion 262 of the knob 260 backward.

4, since the knob 260 operates under the condition formed between the body portion 250 and the rear cover 280, the range of movement of the knob 260 is not large.

As the knob 260 rotates toward the rear cover 280 in the direction of the arrow shown in FIG. 5, the restraint state of the retraction limit lock 271 and the concave-convex portion 216 can be released. That is, by pushing the knob 260 in the retracting direction of the push plate 240, the push-back of the push plate can be unlocked and the push plate can be retracted at once.

4, a plurality of protrusions are formed in the pressing part 262 of the knob 260 in the horizontal direction. In order to prevent the user's finger from slipping when the user presses the pressing part 262, A projection 263 is formed.

5, an inclined surface 284 may be formed on the rear cover body 281 facing the pressing portion 262. In this case, By forming the inclined surface 284 on the rear cover 280 facing the rear surface of the knob 260 as described above, not only the rotation range of the knob 230 can be limited but also the pressing portion of the knob 260 262 so that the push plate 240 can be retracted while the rotation of the knob 260 is maintained.

It is sufficient that the rotation angle of the knob 260 is such that the end of the retreat limit lock 271 does not hinder the concave / convex portion 216.

6 and 7, the knob 260 and the body portion 250 to which the knob 260 is mounted are provided with a pivot portion insertion groove 255 in which the pivot portion 268 is located to support the pivot or rotational movement of the knob 260, And the pivot portion inserting groove 255 may be provided at an end of the mounting guide portion 257 protruding from the rear surface of the body portion 250 toward the knob 260. A scale (not shown) is formed on the rear surface of the body portion 250 to determine the mounting height of the pressing portion 241. [

The rear surface of the knob 260 is provided with a pivot portion 268 for supporting the rotation or pivoting movement of the knob 260. The pivot portion 268 is provided between the pivot portion insertion groove 255 and the rear cover 280 It can rotate.

A lock receiving portion 266 extending downward is formed in a lower portion of the middle portion of the knob 260 and a retreat limit lock 271 may be provided in the lock receiving portion 266.

At this time, the lock receiving portion 266 of the knob 260 can restrict or block the rotation of the retreat limit lock 271 in the advancing direction of the push plate 240. That is, the retraction limit lock 271 can be prevented from rotating toward the advancing direction of the push plate 240 by the front wall 267 of the lock accommodating portion 266.

The elastic member supporting portion 282 of the rear cover 280 is formed on the upper side of the lock receiving portion 266 so that the elastic member supporting portion 282 is spaced apart from the elastic member mounting portion 269 of the knob 260 .

The elastic member supporting portion 282 and the elastic member welding portion 269 can support the elastic member 264 provided therebetween. That is, the elastic member 264 is deformed while being supported by the elastic member supporting portion 282, and the knob 260 can be rotated with respect to the rear cover 280 by the elastic force generated in the elastic member 264 by this deformation .

Here, the elastic member 264 may be a torsion spring, and both ends should be supported by the knob 260 and the rear cover 280, respectively.

The elastic member 264 is provided between the elastic member mounting portion 269 of the knob 260 and the elastic member supporting portion 282 of the rear cover 280 so that the rotation of the knob 260, . ≪ / RTI > That is, since the elastic member 264 is deformed by the elastic member mounting portion 269 and the elastic member supporting portion 282 as the knob 260 rotates, the push plate 240 is retracted to a desired position and then the knob 260 The knob 260 can easily and quickly return to the original state.

7, the retraction limit lock 271 provided in the lock receiving portion 266 of the knob 260 is a hinge pin (not shown) rotatably mounted in the lock receiving portion 266 of the knob 260 And an engagement portion 273 formed at one end of the hinge pin opposite to the hinge pin and constrained to the concave / convex portion 216.

As the knob 260 is rotated toward the inclined surface 284 of the rear cover 280 by pressing the pressing portion 262, the locking portion 273 is raised upward and the protrusion portion 216 and the locking portion 273 ) Can be released. At this time, the extent to which the engaging portion 273 is raised is sufficient to the extent that the end of the engaging portion 273 is not caught by the concave / convex portion 216, so that it is not necessary to raise the engaging portion 273 much.

Here, the rear side of the retreat limit lock 271 can be elastically supported by the lock supporting member 277. [ The lock support member 277 can return the retreat limit lock 271 to the initial state when the retreat limit lock 271 rotates in the retracting direction.

6, the body portion 250 is provided in front of the retreat limit lock 271 to prevent rotation of the latch portion 273 during its lifting. If the locking part 273 is rotated, the knob 260 is hard to return to the initial state, and the locking part 273 and the concave and convex part 216 may not be constrained even if the knob 260 returns.

Hereinafter, the operation of the pull-back lock releasing means will be described with reference to the drawings. FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 4, and FIG. 9 is a cross-sectional view taken along line VIII-VII of FIG.

8 and 9, when the user presses the pressing portion 262 until the knob 260 comes into contact with the inclined surface 284 of the rear cover 280, the lock receiving portion (not shown) of the knob 260 The retraction limit lock 271, which is rotatably mounted on the support frame 266, is lifted up. That is, since the retraction limit lock 271 is rotatably mounted on the lock receiving portion 266 and the front face of the retreat limit lock 271 is supported by the body portion 250, when the knob 260 is rotated, The limit lock 271 is lifted up in contact with the rear surface of the main body 250. Therefore, the engaging portion 273 of the retreat limit lock 271 is not caught by the concave / convex portion 216.

In this state, if the pushing portion 262 is continuously urged, the push plate 240 can be retracted backward. When the pushing portion 262 is released from the desired position, the knob 260 is returned to its original state by the elastic member 264 and the latching portion 273 of the retreat limit lock 271 again catches on the recessed portion 216, (240) can not retract.

8, when the knob 260 rotates, it can be seen that the engaging portion 273 of the retreat limit lock 271 slightly rises and does not contact the concave / convex portion 216. That is, since the end of the latching portion 273 is positioned higher than the projection 216a of the concave / convex portion 216, the push plate 240 can be retracted backward in this state.

When the push plate 240 is retracted to a desired position and the knob 260 is then released, the knob 260 returns to its initial state by the elastic force of the elastic member 264, And is positioned in the groove 216b. In this state, retraction of the push plate 240 is restrained.

The push plate 240 may include a knob 260 for releasing the restraint of the retraction of the push plate 240 by the concave and convex portion 216, And the push plate 240 can be released from the restraint state as the knob 260 rotates.

The retraction limit lock 271 rotatably mounted on the knob 260 to prevent the push plate 240 from being retracted by being caught by the protrusion 216 is configured such that the knob 260 rotates in the retracting direction of the push plate 240 RD, the restraint state with the concave and convex portions 216 can be released.

Although the media storage device of the financial automation device described so far has been described from the viewpoint of the financial automation device for withdrawal, it can be applied not only to the financial automation device for depositing money and the cash deposit / withdrawal machine, but also to the present invention Or as a minimum description of the present invention, and should not be understood as limiting the scope of the present invention.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

1 is a side view schematically illustrating a financial automatic machine according to an embodiment of the present invention;

FIG. 2 is a perspective view showing a media storage device of the financial automatic machine according to FIG. 1,

FIG. 3 is a perspective view showing the internal structure of the media storage device according to FIG. 2,

FIG. 4 is a perspective view showing a substantial part of the push plate according to FIG. 3,

Figure 5 is a side view of the push plate recess according to Figure 4,

Fig. 6 is an exploded perspective view of the push plate recess according to Fig. 4,

FIG. 7 is a perspective view showing the inside of the push plate recess according to FIG. 4,

FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 4,

Fig. 9 is a cross-sectional view taken along the section line IX-IX of Fig. 3;

Description of the Related Art

100: Automatic teller machine 200: Media storage device

210: base cassette 216: concave / convex portion

240: push plate 250:

260: Knob 271: Retraction limit lock

280: Rear cover

Claims (8)

1. A media storage device for a financial automation apparatus having a base provided with a bottom portion on which a paper medium is loaded, a base cassette in which the base is housed, and a cassette cover for opening and closing the base cassette, A push plate coupled to the belt provided at the bottom portion to press the paper medium and to advance or retract with the circulation of the belt; And And an uneven portion formed on the bottom portion to be parallel to the belt and restricting retraction of the push plate, Wherein the push plate includes a retreat limit lock engaged with the concave / convex portion to limit retraction of the push plate, and a retreat / release releasing means releasing the retraction limit lock and the engagement state of the concave / , Wherein the retract / A main body portion to which a pressurizing portion for pressurizing the paper medium is mounted, the main body portion being fastened to the belt; A knob provided at the rear of the main body and having the retreat limit lock; And And a rear cover mounted to the rear of the knob for supporting the rotation of the knob, And the restricting state of the recess restricting portion is released as the knob rotates toward the rear cover. delete The method according to claim 1, The knob A lock receiving portion for receiving the retreat limit lock; A pivot portion provided at the rear of the lock receiving portion and provided between the main body portion and the rear cover to enable rotation of the knob; An elastic member mounting portion formed on the lock receiving portion and provided with an elastic member for supporting rotational movement of the knob; And And a pressing part formed on both sides of the elastic member mounting part for rotating the knob toward the rear cover. The method of claim 3, The rear cover includes an elastic member support portion that is spaced apart from the elastic member mounting portion and is bent to be positioned on the upper portion of the elastic member mounting portion, and a rear cover body that supports the rear portion of the knob, Wherein a slant surface is formed on the rear cover body facing the pressing portion. 5. The method of claim 4, Wherein the elastic member is provided between the elastic member mounting portion and the elastic member supporting portion to support the rotational movement of the knob. The method according to claim 4 or 5, Wherein the retraction limit lock is rotatably mounted to the knob, and one end of the retraction limit lock is formed with a locking portion that is constrained to the recessed portion, And the locking portion is lifted as the knob rotates toward the rear cover to release the restraint from the concave / convex portion. The method according to claim 6, Wherein the knob is rotatable until it comes into contact with the inclined paper surface. The method according to claim 6, Wherein the main body portion is provided in front of the retreat limit lock to prevent rotation of the locking portion during the lifting of the retention limit lock.

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