KR101908041B1 - Cutting force controlled clutch and printer with same - Google Patents

Abstract

The present invention relates to a power clutch with an adjustable cutting force and a printer equipped with the power clutch. The power clutch is provided in the printer having a cutting portion cutting a recording sheet on a path along which the recording sheet is discharged and a driving portion providing power with respect to driving of the cutting portion. The present invention includes an accommodating space rotatably disposed between the cutting portion and the driving portion so as to transmit the power provided to the driving portion to the cutting portion, provided so as to vary the power provided to the cutting portion in accordance with the thickness of the recording sheet, and accommodating the recording sheet. Disclosed are the power clutch with an adjustable cutting force and the printer equipped with the power clutch, including a case having a discharge port on one side so that the recording sheet is discharged to the outside, a printing head printing the recording sheet and provided on a transport path of the recording sheet discharged to the outside through the discharge port, the cutting portion provided on the transport path and cutting the recording sheet discharged to the discharge port, the driving portion provided in the case and providing power so that the cutting portion is capable of cutting the recording sheet, and the power clutch rotatably disposed between the cutting portion and the driving portion so as to transmit the power provided to the driving portion to the cutting portion and provided so as to vary the power provided to the cutting portion in accordance with the thickness of the recording sheet.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power clutch,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a printer capable of cutting a recording sheet, and more particularly, to a printer capable of adjusting a cutting force for controlling a cutting force so that jamming does not occur according to a recording sheet.

In everyday life, printing is done in many parts using printer. Generally, a printer is divided into a dot printer, a laser printer, and a thermal printer using thermal paper. The thermal printer is a thermal printer that prints thermal paper by thermal chemical Printer.

In particular, in the case of a printer, the internal configuration is a printer widely used because of its simple and convenient portability.

Since the conventional printer generates heat to print on the recording sheet, the recording sheet is conveyed between the thermal head for generating heat and the conveying roller for conveying the recording sheet, and the thermal head makes contact with the recording sheet to generate heat, .

Here, the printer includes a cutting portion that slides to cut the recording sheet used for printing. The cutting portion is slid while the recording sheet is caught in the cutting portion or overlapped during the conveyance, resulting in a load.

This is particularly the case with various types of recording paper.

The recording paper has a variety of types such as art paper and artificial paper as well as the generally used snow paper, and thus the cutting force required for cutting is different depending on the kind of recording paper.

Therefore, the force applied to the cutting portion must be different depending on the material and the thickness.

If a thick recording paper is inserted into the printer, a large force must be provided to the cutting portion, and a small force should be provided when a thin recording paper is inserted.

This is because the recording sheet is not cut when the thick recording sheet is supplied with a small force, and when the thin sheet is supplied with a large force when cutting the sheet, the cutting portion is slid and the driving to the printer is not smooth and the jam is more likely to occur .

If the cutting force is applied in the same manner according to the recording sheet, even if a jam occurs due to sliding of the cutting portion due to the power provided by the motor, power is supplied so as to continuously slide on the cutting portion, Or a problem that the cutter coupled to the case may be detached to injure the user.

Therefore, a printer in which the cutting force is provided differently according to the recording paper is required.

It is an object of the present invention to provide a power clutch on a path through which a power is transmitted so that a cutting force can be changed according to a recording paper by controlling a speed at which a movable blade slidable in a conventional printer is slid, It is possible to prevent the jam by providing an appropriate cutting force.

And a power clutch capable of additionally controlling the cutting force of the cutting portion is disposed between the power supplier and the cutting portion so that the cutting force is adjusted to prevent the wearer from injuring the user, and a printer having the power clutch.

According to an aspect of the present invention, there is provided a power clutch provided in a printer having a cutting unit for cutting a recording sheet on a path along which a recording sheet is discharged and a driving unit for providing power for driving the cutting unit, The driving unit is rotatably disposed between the cutting unit and the driving unit so as to transmit the power provided to the driving unit to the cutting unit. The power provided to the cutting unit is adjusted differently according to the thickness of the recording sheet.

The power clutch includes a first rotating gear connected to the cutting unit and rotating with a rotating shaft, a second rotating gear disposed parallel to the first rotating gear, rotatably mounted on the same rotating shaft, And a connecting portion disposed between the first rotating gear and the second rotating gear and interconnecting the first rotating gear and the second rotating gear such that the first rotating gear and the second rotating gear can rotate at the same time by the rotating force of the driving portion.

The connecting portion may be made of a material having elasticity and may transmit the power provided through the second rotary gear to the cutting portion through the first rotary gear so as to simultaneously rotate the first rotary gear and the second rotary gear .

The connecting portion is formed in the form of a torsion spring and is disposed around the rotating shaft, and both ends thereof are coupled to the first rotating gear and the second rotating gear, respectively.

A plurality of control grooves may be formed on the circumference so that the end portions of the connection portions are inserted into at least one of the first rotary gear and the second rotary gear.

In addition, the connection portion may change the position of the driving portion inserted into the control groove to adjust the power provided to the cutting portion.

According to another aspect of the present invention, there is provided a printer comprising: a case having a receiving space for receiving a recording sheet therein and having a discharge port for discharging the recording sheet to the outside, A printing unit that is provided on a conveyance path of the recording sheet to print the recording sheet, a cutting unit that is provided on the conveyance path to cut the recording sheet discharged to the discharge port, And a driving unit that is rotatably disposed between the cutting unit and the driving unit to transmit the power provided to the driving unit to the cutting unit, And a power clutch that is provided to adjust the rotation speed of the engine.

The power clutch includes a first rotating gear connected to the cutting unit and rotating with a rotating shaft, a second rotating gear disposed parallel to the first rotating gear, rotatably mounted on the same rotating shaft, and connected to the driving unit, A first rotating gear and a second rotating gear, the first rotating gear and the second rotating gear being connected to each other so that the first rotating gear and the second rotating gear can rotate at the same time by a rotating force of the driving unit, When the gear does not rotate, the second rotating gear may include a connecting portion that rotates relative to the second rotating gear.

The connecting portion may be made of a material having elasticity and can transmit the power provided through the second rotary gear to the cutting portion through the first rotary gear so as to simultaneously rotate the first rotary gear and the second rotary gear have.

The connecting portion may be formed in a torsion spring shape and disposed around the rotating shaft, and both ends may be coupled to the first rotating gear and the second rotating gear, respectively.

And a plurality of control grooves formed on the circumference so that the end portions of the connection portions are inserted into at least one of the first rotary gear and the second rotary gear.

In addition, the connecting portion may be adjusted in a cutting force for changing a position of insertion of the driving portion into the control groove to adjust power provided to the cutting portion.

The cutting portion may include a fixed blade formed adjacent to the discharge port, a movable blade disposed to face the fixed blade around the discharge port, and a movable blade slidable toward the fixed blade with a power provided by the driving portion.

The cutting portion may include a power switching portion coupled to the upper portion of the movable blade and coupled to slide in response to rotation of the power clutch.

Further, the first rotary gear may be provided with a reduction gear having a relatively small diameter on one surface facing the second rotary gear.

The plurality of reducers may be formed to have different diameters along the rotation axis.

In order to solve the above problems, the present invention has the following effects.

First, a plurality of control grooves are formed along the inner circumference of the first gear portion, so that the force applied to the movable blade can be adjusted according to the position where the first projection member of the coupling portion is inserted into the control groove, have.

Secondly, there is a merit that a reduction gear is formed between the driving part and the cutting part so that the movable blade can be slid with a small force and that the slider is precisely slid.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

FIG. 1 is a perspective view showing an outer appearance of a power clutch and a printer having the power clutch whose cutting force is adjusted according to an embodiment of the present invention; FIG.
FIG. 2 is a perspective view schematically illustrating an internal configuration of a power clutch and a printer having the power clutch of FIG. 1; FIG.
FIG. 3 is a view illustrating a driving state in FIG. 1; FIG.
FIG. 4 is an exploded perspective view of a power clutch in a power clutch and a printer having the same according to an embodiment of the present invention; FIG.
5 is a view illustrating a state in which a plurality of control grooves are formed on an inner circumference of a first rotary gear of a power clutch in which a cutting force is adjusted according to an embodiment of the present invention and a printer having the same,
6 is a view showing a power clutch whose cutting force is adjusted according to an embodiment of the present invention and a power switching unit coupled to the reduction gear and the power clutch in the power clutch.
FIG. 7 is a view illustrating a state in which a power clutch is rotated such that a movable blade is separated from a fixed blade in a power clutch and a printer having the power clutch whose cutting force is adjusted according to an embodiment of the present invention; FIG.
8 is a view showing a state in which the power provided by the driving unit is cut off when a jam occurs in the power clutch whose cutting force is controlled according to an embodiment of the present invention.
FIG. 9 is a view showing a power clutch with a cutting force controlled according to a second embodiment of the present invention and a power converter having the power clutch in a form of a worm gear with the power clutch in the printer. FIG.
10 (a) and 10 (b) are views showing a state in which the movable blade is moved in response to the rotation of the worm gear in the power clutch and the printer having the power clutch whose cutting force is adjusted according to the second embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present embodiment, the same designations and the same reference numerals are used for the same components, and further description thereof will be omitted.

Moreover, in describing the present invention, terms indicating directions such as forward, rearward, or upward and downward are described so that those skilled in the art can clearly understand the present invention, and the directions indicate relative directions, It is not limited.

1 to 3, a power clutch having a cutting force according to an embodiment of the present invention and a printer having the same will be described.

FIG. 1 is a perspective view showing an outer appearance of a power clutch and a printer having the same, the cutting force of which is adjusted according to an embodiment of the present invention. FIG. 2 is a perspective view of a power clutch, And FIG. 3 is a view showing a state in which it is driven in FIG. 1. FIG.

In the following description, the 'power clutch with cutting force is controlled and the printer equipped with the power clutch' is replaced with 'printer 10'.

The basic configuration of the printer 10 includes a case 100, a printing head 120, a cutting unit 200, a driving unit 300, and a power clutch 400. Referring to FIG.

Here, the case 100 has a receiving space (not shown) formed therein to enclose the printing head 120, the cutting unit 200, the driving unit 300, and the power clutch 400.

In addition, a conveyance roller (not shown) for conveying a recording sheet (not shown) may also be provided.

Components not mentioned in the printer 10 according to the present embodiment apply a configuration similar to that of the printer 10 generally used.

Accordingly, the case 100 may be partially detachably attached to the accommodating space so as to replace the recording sheet.

For example, a cover (not shown) that can be selectively opened and closed through rotation can be provided at one side, and the discharge port 110 can communicate with the inside accommodation space.

In the receiving space, the recording sheet is accommodated in a wound state and is discharged to the outside through the discharge port 110.

As described above, the cover is configured to selectively open and close the accommodation space, and when the cover is closed, the case 110 and the outlet 110 are formed. In this embodiment, the cover is configured to be able to be tilted up and down at one side of the case 100 so as to cover the accommodation space.

In addition, the case 100 according to the present invention may further include a separate conveying roller for conveying the recording paper accommodated in the accommodating space to the outside.

The conveying roller has a predetermined width and is rotatably coupled to the inside of the case 100 to convey the recording sheet. Here, the conveying roller is coupled to one side of the conveying guide, and the recording sheet moves along the conveying guide and is discharged to the outside by the rotation of the conveying roller.

Meanwhile, the printing head 120 is provided on the conveyance path of the recording sheet, which is discharged to the outside through the discharge port 110, in the case 100, and one side thereof contacts the recording sheet to generate heat.

Specifically, one side of the path through which the recording sheet is conveyed comes into contact with the recording sheet, generates heat, and is printed on the recording sheet to which heat is transferred. Here, the recording paper is a thermal transfer paper.

In the present embodiment, the printing head 120 is coupled to the lower surface of the cover 110, and is positioned inside the receiving space according to the open / closed state of the cover 110.

The printing head 120 according to the present invention has a shape corresponding to the shape of the conveyance guide described above, and is configured to be spaced apart from the conveyance guide by a predetermined distance when the cover is closed.

Accordingly, when the printing head 120 is positioned in the receiving space with the cover closed, the recording sheet is conveyed between the printing head 120 and the conveyance guide, As shown in FIG.

As such, the printing head 120 according to the present invention can print on the recording paper when the recording paper accommodated in the receiving space is transported to the outside and discharged.

The printing head 120 according to the present invention is coupled to the lower surface of the cover to selectively adjust the position of the printing head 120 according to the opening and closing states of the cover, The printing head 120 may be directly coupled to the printing head 120.

In addition, a controller (not shown) may be provided on the case 100 to allow the user to make various settings.

Subsequently, the cutting unit 200 is provided on the conveyance path of the recording sheet to cut the recording sheet discharged to the discharge port 110.

The cutting unit 200 is disposed opposite to the fixed blade 210 around the fixed blade 210 and the discharge port 110 formed adjacent to the discharge port 110 through which the recording paper is discharged, And a movable blade 220 that slides toward the fixed blade 210 with a predetermined force.

Specifically, the cutting unit 200 is formed to be cut around the discharge port 110 through which the recording sheet printed to cut the recording sheet is discharged, and is formed to have a length corresponding to at least the width of the recording sheet.

The movable blade 220 is slidable toward the cutting unit 200 and is slidably mounted on the case 100 by the power provided by the driving unit 300.

Here, the movable blade 220 is formed with the power switching unit 240 at both ends thereof to receive the power provided by the driving unit 300.

The power switching unit 240 transmits the power of the wing gear 242 and the driving unit 300 protruding downward at both ends to the wing gear 242 so as to be slidable by the rotating gear, And a rotary gear 244 rotated so that the blade 220 slides.

Here, the driving unit 300 is formed of a motor, and is configured to be rotated in both directions so that the movable blade 220 can slide in the forward and backward directions toward the discharge port 110.

The power clutch 400 is rotatably disposed between the cutting unit 200 and the driving unit 300 to transmit the power provided from the driving unit 300 to the cutting unit 200, And is provided to adjust the power to be supplied differently.

Specifically, the power clutch 400 includes a first rotating gear 420 connected to the movable blade 220 and rotating with a rotating shaft, a second rotating gear 420 disposed parallel to the first rotating gear 420 and rotatable with the same rotating shaft, A second rotary gear 440 connected to the first rotary gear 420 and a second rotary gear 440 connected between the first rotary gear 420 and the second rotary gear 440, And a connecting portion 460 interconnecting the two rotary gears 440 so as to be rotatable at the same time.

As shown in the figure, a part of the power clutch 400 is connected to the driving part 300 and another part of the power clutch 400 is connected to the rotating gear 244 to transmit the power generated by the driving part 300 to the cutting part 200 .

More specifically, teeth are formed around the first rotating gear 420 and connected to the driving unit 300.

The second rotating gear 440 rotating together with the first rotating gear 420 by the connecting portion 460 transmits the power provided from the driving portion 300 to the rotating gear 244 and rotates the rotating gear 244 The movable blade 220 is slid while the wing gear 242 slides.

The power switching unit 240 includes the rotating gear 244 and the wing gear 242 to rotate the rotating gear 244 and rotate the wing gear 242 coupled to the movable blade 220 And a rack-and-pinion structure that slides the rack.

However, the power switching unit 240 may be provided in the form of a worm gear.

The power switching unit 240 is provided with the power clutch 400 on the inner side of the movable blade 220, that is, on the side of the movable blade 220 in the direction of the body, and the drive unit 300 is mounted on the same side And a cam gear 246 rotated by a rotating shaft in the driving unit is disposed, and the cam gear 246 and the second rotating gear 440 are connected to each other.

With this structure, the driving unit 300 is directly connected to the movable blade 200 to slide the movable blade 220.

More details will be described later.

The power clutch 400 will be described in detail with reference to the drawings.

FIG. 4 is an exploded perspective view of the power clutch 400 in which the cutting force is adjusted and the power clutch 400 in the printer. FIG. 5 is a perspective view of the power clutch and the printer, And a plurality of control grooves 422 are formed on the main body to insert the connecting portion 460 therein.

The connecting portion 460 is provided between the second rotating gear 440 rotated by the driving portion 300 and the first rotating gear 420 connected to the movable blade 220 to rotate the second rotating gear 440. [ 440 to the first rotary gear 420. The first and second rotary gears 420,

The connecting portion 460 is made of a material having elasticity.

Specifically, it is formed in the form of a torsion spring and is disposed around the rotating shaft, and both ends thereof are coupled to the first rotating gear 420 and the second rotating gear 440, respectively.

It can be confirmed that both ends of the connection portion 460 protrude upward toward the upper side with respect to the wound central portion.

The protruded both ends are referred to as a second protruding member 464 inserted into the second rotary gear 440 and a first protruding member 462 inserted into the first rotating gear 420.

At least one groove is formed on the inner circumference of the second rotary gear 440 so that the second rotary gear 440 is rotated so that the inserted second protruding member 464 is not released. In both directions.

The first projecting member 462 is inserted into the control groove 422 formed on the inner circumference of the first rotary gear 420.

As described above, a plurality of control grooves 422 are formed along the inner circumference of the first rotary gear 420 to have a hole shape so that the first protruding member 462 is inserted.

It may also be formed at least partially along the perimeter to allow the first protruding member 462 to be inserted and secured.

It can be seen that a plurality of control grooves 422 are formed on at least a part of the inner circumference of the first rotary gear 420 as shown in FIG.

Accordingly, the larger the distance that the first protruding member 462 and the second protruding member 464 are spaced apart from each other along the elastic force of the wound center portion, the greater the elastic force. 440) is reduced, which increases the power provided to the movable blade 220. [0051] As shown in FIG.

Will be described in detail with reference to the drawings.

As shown in the drawing, the connecting portion 460 is disposed between the first rotating gear 420 and the second rotating gear 440, and is formed of an elastic material wound in plural turns.

The connecting portion 460 includes a first protruding member 462 fixedly coupled to the first rotary gear 420 and a second protruding member 464 fixedly coupled to the second rotating gear 440, The member 462 and the second projection member 464 protrude upward as shown.

A control groove 422 is formed in a part of the inner periphery of the first rotary gear 420 to engage with the first projecting member 462 and a second projecting member 422 is formed in a part of the inner periphery of the second rotary gear 440. [ And a second groove 442 to which the second groove 464 is coupled.

When the power is transmitted to the second rotary gear 440 in accordance with this arrangement, the connecting portion 460 transmits the power to the first rotating gear 420, and the rotational elastic force of the connecting portion 460 is greater than the power, Power transmission.

This can prevent the user from being injured by the damage of the printer 10, including the occurrence of a load on the driving unit 300 by continuously sliding the movable blade 220 when the jam occurs.

Therefore, when the jam occurs, the connecting portion 460 should be wound in consideration of a force to the extent that the movable blade 220 is not slid.

The power clutch 400 is rotatably formed in a circular shape so as to transmit the power provided by the driving unit 300.

The first rotating gear 420 and the second rotating gear 440 may have different diameters and the second rotating gear 440 is connected to the driving unit 300.

The first rotary gear 420 is formed to have a relatively smaller diameter than the second rotary gear 440 and a reduction gear 426 is formed on one surface of the first rotary gear 420 facing the second rotary gear 440.

Accordingly, according to the user's selection, the reduction gear 426 is connected to the power switching unit 240 so that the sliding of the cutting unit 200 can be precisely controlled.

Here, the degree of winding of the coupling portion 460 is represented by the rotational elasticity of the coupling portion 460, so that the coupling portion 460 should be wound in consideration of the force that the power switching portion 240 slides through the reduction gear 426.

The difference in force transmitted to the movable blade 220 according to the position where the first projection member is inserted on the first rotary gear will be described with reference to the drawings.

5, it can be seen that a plurality of control grooves 422 are formed on the inner circumference of the first rotary gear 420.

For explanation, the control groove 422 will be described as an A groove 422A, a B groove 422B, and a C groove 422C.

When the first protrusion member 462 is inserted into the A groove 422A, the distance between the second protrusion member 464 and the second protrusion member 464 is shortened so that the power supplied to the first rotation gear 420 from the second rotation gear 440 is maintained .

For example, when the power is transmitted to the first rotary gear 420 by the power of 100 in the second rotary gear 440, when the connection portion 460 is inserted into the A groove 422A, And is transmitted to the rotary gear 420.

When the first protruding member 462 is inserted into the B groove 422B, the elastic force of the connecting portion 460 is applied to the power of 100, so that the distance between the A groove 422A and the B groove 422B So that it is transmitted to the first rotary gear 420.

When the first protruding member 462 is inserted into the C groove, a force equivalent to the distance between the A groove 422A and the C groove 422C is added to the power of 100 and transmitted to the first rotary gear 420. [

This is because the connecting portion 460 is made of an elastic material and the center portion is wound so that the torque according to the distance of the A groove 422A to the C groove 422C is applied to the elastic force.

The power transmitted to the movable blade 220 is different according to the position where the first projecting member 462 is inserted into the control groove 422 in this manner.

Here, a reduction gear is formed on one surface of the first rotary gear 420 so that power can be efficiently transmitted to the movable blade 220.

The reduction gear 426 will be described with reference to the following drawings.

FIG. 6 is a view showing a power clutch whose cutting force is adjusted according to an embodiment of the present invention, and a power switching unit coupled to the reduction gear and the power clutch in the power clutch. FIG.

As shown, the reduction gear 426 has a radius of R1, and the first rotary gear 420 has a radius of R2.

Further, it can be seen that the reduction gear 426 is connected to the power switching unit 240.

Accordingly, it is possible to control the power switching unit 240 with a smaller force than that applied to the first rotary gear 420.

For example, suppose that R1 has a radius of half of R2.

If the first rotary gear 420 is applied with 1 kgf, the power switching unit 240 can be controlled by a force of 0.5 kgf in the reduction gear 426.

Accordingly, the reduction gear 426 can slide the cutting portion 200 with a force smaller than that provided by the second rotary gear 440, thereby allowing the cutting portion 200 to be slid accurately.

Here, the reduction gear 426 may be detachably coupled to the first rotation gear 420, and various reduction gears 426 may be coupled to the first rotation gear 420 to adjust the sliding of the cutting unit 200. [ . ≪ / RTI >

At this time, the reduction gear 426 may be screwed to the first rotation gear 420, or may be fitted.

A connecting portion 460 is disposed between the first rotating gear 420 and the second rotating gear 440.

The connecting portion 460 is connected to the first rotating gear 420 and the second rotating gear 440 so that the first rotating gear 420 and the second rotating gear 440 can rotate at the same time and the second rotating gear 440 is rotated in accordance with an event occurring in the cutting portion 200 Relative rotation.

The event referred to herein may be a jam (JAM) generated by the recording sheet and the cutting unit 200.

The jam is cut by the cutting unit 200 while the printed paper is discharged to the discharge port 110. In this process, depending on the thickness and material of the recording paper, It means a situation that is not discharged.

When the jam occurs in this manner, the power clutch 400 is applied to stop the operation of the cutting unit 200. [

The connecting portion 460 is made of a material having elasticity so that the power provided through the second rotary gear 440 to rotate the first rotating gear 420 and the second rotating gear 440 simultaneously is transmitted to the first rotating gear 420 to the cutting unit 200.

The connection portion 460 is formed in the form of a torsion spring and is disposed around the rotation axis, and both ends thereof are fixedly coupled to the first rotation gear 420 and the second rotation gear 440, respectively.

The rotating shaft is formed in the case 100 so as to insert the power clutch 400 and is formed with a rotating shaft 460 for guiding the power clutch 400 to rotate.

On the other hand, the movable blade 220 is separated from the fixed blade 210 while the direction in which the driving unit is rotated is changed.

Next, the structure in which the movable blade 220 is spaced apart will be described with reference to FIG.

7 is a view showing a state in which the power clutch 400 is rotated such that the movable blade is separated from the fixed blade 210 in the power clutch and the printer having the power clutch whose cutting force is controlled according to the embodiment of the present invention.

Here, the first rotary gear 420 and the second rotary gear 440 are moved in opposite directions due to the physical coupling.

As shown in the figure, the first rotation gear 420 and the second rotation gear 440 have a first engagement portion 444 and a second engagement portion 424, respectively.

Specifically, a part of the periphery of the second rotary gear 440 protrudes toward the periphery of the first rotary gear 420, and the first rotary gear 420 has a groove formed in a part of its periphery, 440 rotate in the opposite direction by the fit-together portion.

The first engaging portion 444 protrudes from a part of the periphery of the first rotating gear 420 and the remaining portion is formed with a groove along the circumference.

The second engaging portion 424 is formed to engage with the groove and is arranged to be engaged when the second rotating gear 440 is rotated in the opposite direction.

In this way, when the movable blade 220 returns to the initial position, the second engaging portion 424 comes into contact with the first engaging portion 444 to rotate the first rotating gear 420, When the blade 220 is slid, the power is transmitted to the first rotating gear 420 through the connecting portion 460 while being rotated along the groove.

As shown in the drawing, the power clutch 400 is rotated as power is supplied from the driving unit 300, and the power is connected so that the cutting unit 200 is slid back and forth.

In Fig. 8A, the power clutch 400 is simultaneously rotated by the driving unit 300

At this time, the second rotary gear 440 is connected to the driving unit 300 and transmits the power to the first rotary gear 420 through the connecting unit 460.

The connecting portion 460 is fixedly coupled to the first rotating gear 420 and the second rotating gear 440 so that the first rotating gear 420 and the second rotating gear 440 rotate simultaneously .

The rotational elasticity means that the first protrusion member 462 and the second protrusion member 464 are elastically deformed in different directions along the direction in which the connection portion 460 made of an elastic material is wound.

The greater the rotational elastic force is the resting force that prevents the connecting portion 460 from moving in different directions.

Specifically, since the first and second projecting members 462 and 464 have less power than the forces that are elastically deformed in different directions, the first and second rotating gears 420 and 440 rotate together do.

At this time, the driving unit 300 provides power to rotate the power clutch 400 and the power switching unit 240 corresponding to the range in which the movable blade 220 is slid.

In this case, when the jam occurs, the load due to the jamming becomes larger than the power, so that the first rotating gear 420 and the second rotating gear 440 may be elastically deformed.

Therefore, only the second rotary gear 440 rotates as shown in FIG. 8 (b).

As shown, the second rotary member 440 is rotated but the first rotary gear 420 is not rotated.

This is because the connection portion provided inside the power clutch 400 does not provide the power provided by the second rotary gear 440 to the first rotary gear 420.

More specifically, it is assumed that a jam occurs in the printer 10.

In order to prevent the printer 10 from being damaged when jamming occurs in the printer 10 so that the cutting portion 200 is no longer moved and an additional force is applied,

The driving unit 300 continues to apply the force to the second rotary gear 440, but the coupling unit 460 buffers the force transmitted from the second rotary gear.

This is because the connecting portion 460 does not transmit the force while being wound inside the first rotating gear 420 without transmitting the force provided from the second rotating gear 440 to the first rotating gear 420 with the rotational elastic force.

With such a principle, the connecting portion 460 must have a rotational elastic force capable of sustaining the maximum output provided by the motor.

9 and 10, the power switching unit 240 according to the second embodiment of the present invention will be described.

9 (a) and 10 (b) are views showing a state in which the power switching unit is connected to the power clutch in the form of a worm gear in the power clutch and the printer having the power clutch with the cutting force according to the second embodiment of the present invention, Is a view showing a state in which the movable blade is moved in response to the rotation of the worm gear in the power clutch and the printer having the power clutch whose cutting force is adjusted according to the second embodiment of the present invention.

As shown in the figure, the power switching portion 240 includes a cam gear 246.

The cam gear 246 is directly connected to the driving portion and protrudes toward the lateral direction of the movable blade 220.

Here, the power clutch 400 is connected to the cam gear 246 in a direction in which the movable blade 220 protrudes from one side, and the power clutch 400 is rotated in accordance with the rotation of the cam gear 246.

Specifically, in the power clutch 400, the second rotary gear 440 contacts the cam gear 246 to receive the power of the driving unit 300, and the engaging part 428 formed on one surface of the first rotating gear 420, The movable blade 220 is connected to a part of the movable blade 220 to rotate the movable blade 220.

The locking part 428 protrudes toward the movable blade 220 and is inserted into the slot 222 formed in a part of the movable blade 220 to move the movable blade 220.

The elongated hole 222 is formed in a predetermined length in the width direction of the movable blade 220 so that the movable blade 220 is not moved in the lateral direction while the engaging portion 428 is rotated, And the movable blade 220 is reciprocated linearly.

Therefore, it is preferable that the length of the elongated hole 222 corresponds to the diameter of the engaging portion 428.

The power clutch 400 is connected to the driving unit 300. When a load is generated in the movable blade 220, the load is not transmitted to the driving unit 300 and the printer 10 by the power clutch 400 .

In addition, although not shown in the drawing, various connecting means for converting rotational motion into linear motion can be used. Specifically, the present invention can be applied to a structure in which gears are provided and can be connected to the power clutch 400, It is of course not limited.

It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. It is obvious to them. Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

10: Printer
100: Case
110:
120: Printing head
200:
210: fixed blade
220: movable blade
240: Power switching section
300:
400: Power clutch
420: first rotation gear
422: Control Home
424: second engaging portion
440: Second rotary gear
442: 2nd home
444:
460:
462: first projecting member
464: second projecting member
480: rotating shaft

Claims (12)

1. A power clutch provided in a printer having a cutting portion for cutting a recording sheet on a path along which a recording sheet is discharged and a driving portion for providing power for driving the cutting portion,
And a driving unit that is disposed to be rotatable between the cutting unit and the driving unit to transmit the power provided to the driving unit to the cutting unit and adjusts the power provided to the cutting unit according to the type of the recording sheet,
A first rotary gear connected to the cutting unit and rotating with a rotary shaft, a second rotary gear disposed in parallel with the first rotary gear and rotatable with the same rotary shaft, the second rotary gear being connected to the driving unit, And a connecting portion that is disposed between the gear and the second rotating gear and that interconnects the first rotating gear and the second rotating gear so that the first rotating gear and the second rotating gear can rotate at the same time,
Wherein the connecting portion is composed of a resilient torsion spring, both ends of the rotating shaft are coupled to the first rotating gear and the second rotating gear,
Wherein a plurality of control grooves are circumferentially formed on at least one of the first rotary gear and the second rotary gear so that an end portion of the connection portion is inserted. delete delete delete delete The method according to claim 1,
The connecting portion
And a position to be inserted into the control groove is changed in order to adjust the power provided from the driving portion to the cutting portion. A case including a receiving space in which a recording sheet is received, and a discharge port through which the recording sheet is discharged to the outside;
A printing head provided on a conveyance path of the recording sheet discharged through the discharge port to print the recording sheet;
A cutting unit provided on the conveyance path to cut the recording sheet discharged to the discharge port;
A driving unit provided in the case to provide power for cutting the recording sheet by the cutting unit; And
A power clutch that is rotatably disposed between the cutting unit and the driving unit to transmit the power provided to the driving unit to the cutting unit and adjusts the power provided to the cutting unit according to the type of the recording paper;
/ RTI >
The power clutch includes a first rotating gear connected to the cutting unit and rotating with a rotating shaft, a second rotating gear disposed parallel to the first rotating gear, rotatably connected to the same rotating shaft, And a connection portion that is disposed between the first rotary gear and the second rotary gear and that interconnects the first rotary gear and the second rotary gear so that the first rotary gear and the second rotary gear can rotate at the same time,
Wherein the connecting portion is composed of a resilient torsion spring, both ends of the rotating shaft are coupled to the first rotating gear and the second rotating gear,
Wherein a cutting force is controlled so that a plurality of control grooves are circumferentially formed on at least one of the first rotary gear and the second rotary gear so that an end of the connection portion is inserted. 8. The method of claim 7,
The cutting portion
A fixed blade formed adjacent to the discharge port;
A movable blade disposed to face the fixed blade about the discharge port and slidable toward the fixed blade by the power provided by the driving unit;
And the power of the power clutch is adjusted. 9. The method of claim 8,
The cutting portion
And a power switching unit coupled to the movable blade and slidably coupled with the rotation of the power clutch. 10. The method of claim 9,
The power switching unit may include:
A wing gear projecting toward both lower ends of the movable blade; And
A rotary gear transmitting the power of the driving unit to the wing gear to slide the movable blade;
And the power of the power clutch is adjusted. 10. The method of claim 9,
Wherein the power switching unit includes a cam gear connected to the driving unit and rotated, and the power clutch is connected to the cam gear to slide the movable blade. 8. The method of claim 7,
And a power clutch having a reduction gear between the power clutch and the drive unit.

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