Door lock device for laundry dryer

Abstract

The present invention relates to a door lock device for a laundry dryer in which a locking device mounted on the main body of the laundry dryer automatically locks a latch mounted on the door before the drying operation and automatically unlocks it when the drying operation is completed. The door lock device for a laundry dryer comprises a locking device (100) mounted on the laundry dryer and a latch (200) mounted on the door that engages with the locking device (100) to lock it. In the locking device (100), power from a motor (110) is transmitted to a lever tube (130) through a gear reduction device (120), a cylindrical latch holder (140) is fitted into the lever tube (130), and a projection (141) protruding from the rear end of the latch holder (140) engages with a ring portion (132) formed on the outer surface of the lever tube (130), thereby causing the latch holder (140) to rotate in the direction of rotation of the lever tube (130) by the lever tube (130), and the latch A sector gear section (142) is positioned at the outer end of the holder (140), a manually operated sub-gear (150) is positioned on the side of the sector gear section (142), and the sector gear section (142) is linked to the sub-gear (150).

Description

Technology Field

[0001] The present invention relates to a door lock device for a laundry dryer in which a locking device mounted on the main body of the laundry dryer automatically locks a latch mounted on the door before the drying operation and automatically unlocks it when the drying operation is completed. More specifically, the invention relates to a door lock device for a laundry dryer in which a projection protruding from the rear end of a latch holder formed in a cylindrical shape engages with a ring formed on the outer circumference of a lever tube, causing the latch holder to rotate in the direction of rotation of the lever tube by the lever tube, and a sector gear formed on the front end of the outer circumference of the latch holder is linked with a sub-gear, thereby allowing the latch to be manually unlocked from the latch holder of the locking device, and causing the sub-gear to spin freely when the user accidentally turns the sub-gear in the opposite direction. Background Technology

[0003] Korean Patent No. 10-2437482 (registered on August 24, 2022) describes a “locking device and a clothing processing device including the same.”

[0004] The above clothing processing device comprises: a cabinet having an opening; a door for opening and closing the opening; and

[0005] A locking device for locking the door; wherein the locking device comprises: a lever provided on the door; a case provided on the cabinet and including an insertion hole so that the lever can be inserted in the front-rear direction; a locking part provided in the case to interfere with the lever and configured to reciprocate in the front-rear direction together with the lever; and a damper located at the rear of the locking part that reduces the movement speed according to the front-rear direction of the locking part; wherein the case includes a first guide hole extended in the front-rear direction and a second guide hole bent from the first guide hole and extended in the up-down direction to guide the movement of the locking part, and the locking part includes a shaft that moves in the up-down direction along the second guide hole when the locking part rotates and moves in the front-rear direction along the first guide hole when the locking part moves linearly in the front-rear direction.

[0006] However, since the garment processing device has a structure in which the lever engages with the catcher to lock, there is no consideration given to preventing damage to the catcher when manually separating the lever from the catcher or forcibly releasing the lever's lock in the event of a power outage. The problem to be solved

[0008] Accordingly, the objective of the present invention is to provide a door lock device for a laundry dryer in which a projection protruding from the rear end of a cylindrical latch holder engages with a ring formed on the outer surface of a lever container, thereby causing the latch holder to rotate in the direction of rotation of the lever container, so that a latch inserted into the latch holder can be locked or unlocked by the catch portion of the latch holder, and a sector gear portion formed on the front end of the outer surface of the latch holder is linked with a sub-gear, so that when the latch locking of the latch in the latch holder of the locking device must be manually unlocked due to causes such as a power outage, if the user manually rotates the sub-gear clockwise, the cylindrical latch holder rotates by a predetermined angle counterclockwise relative to the stationary lever container, thereby unlocking the latch in the latch holder, and when the user accidentally turns the sub-gear in the opposite direction, the sub-gear spins freely, thereby preventing the user's manual operating force from being transmitted to the gear reduction device and preventing damage to the gear of the gear reduction device. means of solving the problem

[0010] An example of a door lock device for a laundry dryer according to the present invention for achieving the above-mentioned purpose is,

[0011] A door lock device for a laundry dryer comprising a locking device mounted on the laundry dryer and a latch mounted on the door that engages with the locking device to lock,

[0012] The above locking device is characterized in that the power of a motor is transmitted to a lever tube through a gear reduction device, a cylindrical latch holder is fitted into the lever tube, a projection protruding from the rear end of the latch holder is caught on a ring formed on the outer surface of the lever tube, causing the latch holder to rotate in the direction of rotation of the lever tube by the lever tube, a sector gear part is disposed at the front end of the outer surface of the latch holder, a manually operated sub-gear is disposed on the side of the sector gear part, and the sector gear part is linked to the sub-gear.

[0013] The above latch holder is characterized by having an arc-shaped catch portion formed to protrude inward at the tip of the inner circumferential surface of the cylindrical portion, an entry / exit cut portion formed in part of the catch portion, a sector gear portion and a locking portion formed at the tip of the outer circumferential surface of the cylindrical portion, a sector gear portion disposed in part of the tip of the outer circumferential surface of the cylindrical portion, and a locking portion disposed in the remaining part.

[0014] The above catch portion is formed in an arc shape and is characterized by having a thickness that increases from one end to the other.

[0015] In addition, the above latch holder is characterized in that the cylindrical part is fitted into the lever tube, so that the front end of the lever tube catches on the inner surface of the catch part, and the front cover is pressed against the front end of the cylindrical part, thereby preventing the cylindrical part from moving between the front cover and the lever tube.

[0016] In addition, the door lock device for a laundry dryer according to the present invention is characterized in that an intermediate partition is disposed between a front cover and a case, a lever tube, a latch holder, and a sub-gear disposed on the front of the intermediate partition are covered by the front cover, and a motor and a gear reduction device disposed on the back of the intermediate partition are covered by the case.

[0017] The above sub-gear is characterized by having a wrench hole for manual operation formed on the upper surface of the clutch pinion, the second ratchet gear of the clutch gear meshing with the first ratchet gear of the clutch pinion so as to be coupled in only one direction, the clutch gear being elastically supported by a spring, the clutch pinion being rotatably positioned in the auxiliary cylindrical part of the front cover, a cylindrical housing being positioned in the intermediate bulkhead to match the auxiliary cylindrical part of the front cover, a spring and a clutch gear being positioned in the cylindrical housing, and a spur gear being formed on the upper part of the outer circumference of the clutch gear so as to be coupled with the sector gear of the latch holder.

[0018] The above clutch pinion is characterized by having a wrench hole formed from the upper surface of the cylindrical part downward, a rim formed at the lower end of the outer circumference of the cylindrical part, a shaft projection protruding downward from the lower surface of the cylindrical part, a first ratchet gear formed on the lower surface of the cylindrical part, the first ratchet gear arranged around the shaft projection, and the first ratchet gear including a vertical part and an inclined part.

[0019] The above clutch gear is characterized by having a plurality of ribs formed in a straight line vertically around the circumference of a cylindrical body arranged at regular intervals, a spur gear formed at the upper end of the cylindrical body so that the spur gear is coupled with the sector gear of a latch holder, a hollow portion formed vertically in the cylindrical body so that the shaft projection of a clutch pinion is fitted into the hollow portion, a second ratchet gear formed on the upper surface of the cylindrical body portion so that the vertical portion of the second ratchet gear meshes with the vertical portion of the first ratchet gear, and the lower surface of the cylindrical body is elastically supported by a spring.

[0020] The above gear reduction device is characterized in that the lower worm gear of the first gear is coupled to a worm mounted on the drive shaft of the motor, the upper gear of the second gear is coupled to the upper gear of the first gear, the upper gear of the third gear is coupled to the lower gear of the second gear, the upper gear of the fourth gear is coupled to the lower gear of the third gear, the upper gear of the fifth gear is coupled to the lower gear of the fourth gear, the lower spline shaft of the sixth gear is coupled to the slotting hole of the lever tube on the lower gear of the fifth gear, and the second gear, the fourth gear, and the sixth gear are fitted in a stacked manner on the first gear shaft so that the fourth gear can rotate relative to the second gear and the sixth gear can rotate relative to the fourth gear, and the third gear and the fifth gear are fitted in a stacked manner on the second gear shaft so that the fifth gear can rotate relative to the third gear.

[0021] The above latch is characterized by comprising a base plate mounted on the door of a laundry dryer, a column portion erected from the base plate, a hook portion vertically connected to the front end of the column portion, a roller fitted into the hook portion, and an E-ring fastened to the hook portion so as not to detach the roller from the hook portion.

[0022] In addition, the door lock device for a laundry dryer according to the present invention is characterized by being applied to a washing machine door such that the locking device and the latch can automatically lock or unlock the washing machine door. Effects of the invention

[0024] By this, the door lock device for a laundry dryer according to the present invention has the effect of preventing damage to the gear of the gear reduction device by preventing manual operation force from being transmitted to the gear reduction device when the user manually rotates the sub-gear clockwise in the event that a power outage or the like occurs and the latch locking of the latch holder of the locking device must be manually released. When the user manually rotates the sub-gear clockwise while the lever container is in a stationary state, the cylindrical latch holder rotates counterclockwise by a predetermined angle relative to the stationary lever container, thereby releasing the latch locking of the latch in the latch holder. Brief explanation of the drawing

[0026] FIG. 1 is a perspective view illustrating the main components of a door lock device for a laundry dryer according to the present invention. Figures 2 and 3 are intended to explain how a cylindrical latch holder rotates relatively without affecting the lever housing by means of a manually operated sub-gear. FIG. 4 is a perspective view illustrating a latch holder to explain the catch portion. FIG. 5 is a perspective view illustrating a door lock device for a laundry dryer according to the present invention, in which a latch is locked to the locking device. FIG. 6 is a cross-sectional view along line AA of FIG. 5 illustrating a door lock device for a laundry dryer according to the present invention. FIGS. 7 and FIGS. 8 are exploded perspective views illustrating a door lock device for a laundry dryer according to the present invention. FIG. 9 is an exploded perspective view illustrating a sub-gear being mounted on a locking device. FIG. 10 is an exploded perspective view illustrating the coupling structure of the clutch pinion and clutch gear of the sub-gear. FIG. 11 is a cross-sectional view along the BB line of FIG. 5 illustrating the mounting structure of the sub-gear. FIG. 12 is an exploded perspective view illustrating how the power of the motor is transmitted to the lever container through a gear reduction device. Fig. 13 is an exploded perspective view illustrating a latch. Specific details for implementing the invention

[0027] Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. This description is not intended to limit the present invention to specific embodiments and should be understood to include all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. Similar reference numerals have been used for similar components in describing each drawing, and unless otherwise defined, all terms used in this specification, including technical or scientific terms, have the same meaning as generally understood by a person skilled in the art to which the present invention pertains.

[0028] In this document, when a part is described as "including" a certain component, it means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0030] Referring to FIGS. 1 to 3, the door lock device for a laundry dryer according to the present invention comprises a locking device (100) mounted on a laundry dryer (not shown) and a latch (200) mounted on a door (not shown) and locked by engaging with the locking device (100).

[0031] The above locking device (100) transmits power from the motor (110) to the lever tube (130) through the gear reduction device (120), and a cylindrical latch holder (140) is fitted into the lever tube (130). A protrusion (141) protruding from the rear end of the latch holder (140) is caught on a ring (132) formed on the outer surface of the lever tube (130), causing the latch holder (140) to rotate in the direction of rotation of the lever tube (130) by the lever tube (130). A sector gear part (142) is positioned at the front end of the outer surface of the latch holder (140), and a manually operated sub-gear (150) is positioned on the side of the sector gear part (142), and the sector gear part (142) is linked to the sub-gear (150).

[0032] The above latch holder (140) has an arc-shaped catch portion (145) formed to protrude inward at the inner end of the cylindrical portion (147), an entry / exit cut portion (146) formed in part of the catch portion (145), a sector gear portion (142) and a locking portion (143) formed at the outer end of the cylindrical portion (147), the sector gear portion (142) is positioned in part of the outer end of the cylindrical portion (147), and the locking portion (143) is positioned in the remaining part.

[0033] By this, when the latch holder (140) is rotated after the hook portion (205) of the latch (200) is inserted into the interior of the latch holder (140) formed as a cylinder through the entry / exit cut portion (146), the hook portion (250) of the latch (200) is caught on the catch portion (145), thereby locking the latch (200) to the latch holder (140) of the locking device (100).

[0034] Referring to FIG. 4, the catch portion (145) is formed in an arc shape, and the thickness (t) is formed to become thicker from one end (145a) to the other end (145b).

[0035] As a result, as shown in FIGS. 5 and 6, after the hook portion (250) of the latch (200) is inserted through the entry / exit cut portion (146), the latch holder (140) rotates so that the inner surface of the catch portion (145) is caught on the hook portion (250) of the latch (200). At this time, the thickness (t) of the catch portion (145) is formed to become thicker from one end (145a) to the other end (145b), so that as the latch holder (140) rotates, the hook portion (250) of the latch (200) is pressed against the inner surface of the catch portion (145), thereby preventing movement from occurring while the door of the laundry dryer is closed.

[0036] Referring to FIG. 6, the latch holder (140) has a cylindrical part (147) fitted into a lever tube (130), so that the front end of the lever tube (130) catches on the inner surface of the catch part (145), and the front cover (160) is pressed against the front end of the cylindrical part (147), thereby preventing the cylindrical part (147) from moving in the direction of the arrow (149) in FIG. 6.

[0037] Referring to FIGS. 7 through 11, the sub-gear (150) has a wrench hole (151b) for manual operation formed on the upper surface of the clutch pinion (151), and the second ratchet gear (153c) of the clutch gear (153) is engaged with the first ratchet gear (151c) of the clutch pinion (151) so as to be coupled in only one direction, the clutch gear (153) is elastically supported by a spring (155), the clutch pinion (151) is rotatably positioned on the auxiliary cylindrical part (161) of the front cover (160), a cylindrical housing (182) is positioned on the intermediate partition (180) in alignment with the auxiliary cylindrical part (161) of the front cover (160), the spring (155) and the clutch gear (153) are positioned in the cylindrical housing (182), and on the upper part of the outer surface of the clutch gear (153) A spur gear (153d) is formed, and the spur gear (153d) is coupled with the sector gear (142) of the latch holder (140).

[0038] The above clutch pinion (151) has a wrench hole (151b) formed downward from the upper surface of the cylindrical part (151a), a rim (151d) formed at the lower end of the outer circumference of the cylindrical part (151a), an axle projection (151e) protruding downward from the lower surface of the cylindrical part (151a), and a first ratchet gear (151c) formed on the lower surface of the cylindrical part (151a), the first ratchet gear (151c) is arranged around the axle projection (151d), and the first ratchet gear (151c) includes a vertical part (152a) and an inclined part (152b).

[0039] The above clutch gear (153) has a plurality of ribs (153b) formed in a straight line vertically around the circumference of a cylindrical body (153a) arranged at regular intervals, a spur gear (153d) is formed at the upper end of the cylindrical body (153a) so that the spur gear (153d) is engaged with the sector gear (142) of the latch holder (140), a hollow portion (153e) is formed vertically in the cylindrical body (153a) so that the shaft projection (151d) of the clutch pinion (151) is fitted into the hollow portion (153e), a second ratchet gear (153c) is formed on the upper surface of the cylindrical body portion (153a), and the vertical portion (154a) of the second ratchet gear (153c) engages with the vertical portion (152a) of the first ratchet gear (151c). The lower surface of the cylindrical body (153a) is elastically supported by a spring (155).

[0040] By this, when the clutch pinion (151) is rotated clockwise as in the direction of the arrow (157) in FIG. 2, the vertical portion (152a; see FIG. 10) of the first ratchet gear (151c) engages with the vertical portion (154a) of the second ratchet gear (153c) formed on the clutch gear (153), and the clockwise rotational force of the clutch pinion (151) is transmitted to the clutch gear (153), thereby causing the spur gear (153d) of the clutch gear (153) to be coupled with the sector gear (142) of the latch holder (140).

[0041] And, as indicated by the arrow (158) in Fig. 3, when the clutch pinion (151) is rotated clockwise, the inclined portion (152b; see Fig. 10) of the first ratchet gear (151c) pushes the inclined portion (154b; see Fig. 10) of the second ratchet gear (153c) downward, thereby causing the clutch gear (155), which is elastically supported by the spring (155), to move downward and the clutch pinion (151) to spin freely, thus preventing the sector gear (142) of the latch holder (140) from rotating clockwise by the clutch gear (155).

[0043] In the door lock device for a laundry dryer according to the present invention configured as described above, the power of the motor (110) is transmitted to the lever tube (130) through the gear reduction device (120), causing the lever tube (130) to rotate counterclockwise. During the process of the lever tube (130) rotating counterclockwise, the hook portion (132) of the lever tube (130) pushes the projection portion (141) of the latch holder (140) counterclockwise, causing the cylindrical latch holder (140) to rotate counterclockwise. At this time, as shown in FIG. 2, the hook portion (250) of the latch (200) is caught on the catch portion (145) of the latch holder (140), and the latch (200) is locked to the latch holder (140). Here, when the cylindrical latch holder (140) is rotated 90 degrees counterclockwise by the lever (130), as shown in FIG. 3, the entry / exit cut-out portion (146) of the latch holder (140) is positioned at the bottom, so that the hook portion (205) of the latch (200) can be removed through the entry / exit cut-out portion (146) of the latch holder (140).

[0044] In addition, in the state of FIG. 3, when the cylindrical latch holder (140) is rotated 270 degrees counterclockwise by the lever (130), as shown in FIG. 2, the entry / exit cut-out portion (146) of the latch holder (140) is positioned on the left side, and the hook portion (205) of the latch (200) is caught on the catch portion (145) of the latch holder (140) and locked.

[0045] In the door lock device for a laundry dryer according to the present invention, which operates as described above, when a latch (200) mounted on the door is locked to the latch holder (140) of the locking device (100) mounted on the laundry dryer, if a power outage or the like occurs and the locking of the latch (200) from the latch holder (140) of the locking device (100) needs to be manually released, if the user manually rotates the sub-gear (150) clockwise, the state in Fig. 2 changes to the state in Fig. 3, and the locking of the latch (200) from the latch holder (140) is released. That is, when the user manually rotates the sub-gear (150) 90 degrees clockwise, the sector gear portion (142) of the latch holder (140) is connected to the sub-gear (150), causing the cylindrical latch holder (140) to rotate 90 degrees counterclockwise, and as shown in FIG. 3, the entry / exit cut portion (146) of the latch holder (140) is positioned at the bottom, so that the hook portion (205) of the latch (200) can be removed through the entry / exit cut portion (146) of the latch holder (140).

[0046] At this time, the latch holder (140) rotates relative to the lever tube (130) in a stationary state, thereby preventing the gear reduction device (120) connected to the lever tube (130) from being damaged by force when the user manually operates the sub-gear (150).

[0047] In addition, in the state of Fig. 3, when the user accidentally turns the sub-gear (150) counterclockwise, as described above, the clutch pinion (151) of the sub-gear (150) rotates relative to the clutch gear (155) that is elastically supported by the spring (155), causing the clutch pinion (151) to slip, thereby preventing the user's manual operation force from being transmitted to the gear reduction device (120).

[0049] The components of the door lock device for a laundry dryer according to the present invention as described above will be explained in detail.

[0050] Referring to FIGS. 5 to 8, the door lock device for a laundry dryer according to the present invention has an intermediate partition (180) disposed between a front cover (160) and a case (170), a lever tube (130), a latch holder (140), and a sub-gear (150) disposed on the front side of the intermediate partition (180) are covered by the front cover (160), and a motor (110) and a gear reduction device (120) disposed on the back side of the intermediate partition (180) are covered by the case (170).

[0051] Referring to FIG. 12, the gear reduction device (120) has a lower worm gear of the first gear (G1) coupled to a worm (111) mounted on the drive shaft of the motor (110), an upper gear of the second gear (G2) coupled to the upper gear of the first gear (G1), an upper gear of the third gear (G3) coupled to the lower gear of the second gear (G2), an upper gear of the fourth gear (G4) coupled to the lower gear of the third gear (G3), an upper gear of the fifth gear (G5) coupled to the lower gear of the fourth gear (G4), and a lower spline shaft (121) of the sixth gear (G6) coupled to the lower gear of the fifth gear (G5) in the slotting hole (135) of the lever tube (130), and the second gear (G2), the fourth gear (G4), and the sixth gear are coupled to the first gear shaft (122). Gears (G6) are fitted in a stacked order so that the fourth gear (G4) can rotate relative to the second gear (G2) and the sixth gear (G6) can rotate relative to the fourth gear (G4), and the third gear (G3) and the fifth gear (G5) are fitted in a stacked order on the second gear shaft (123) so that the fifth gear (G5) can rotate relative to the third gear (G3).

[0052] The above first to sixth gears (G1, G2, G3, G4, G5, G6) are double gears in which the upper gear and the lower gear are formed integrally.

[0053] As described above, the second gear (G2), the fourth gear (G4), and the sixth gear (G6) are fitted onto the first gear shaft (122), so that the fourth gear (G4) is positioned so as to be rotatable relative to the second gear (G2) at the lower part of the second gear (G2), and the sixth gear (G6) is positioned so as to be rotatable relative to the fourth gear (G4) at the lower part of the fourth gear (G4). Additionally, the third gear (G3) and the fifth gear (G5) are fitted onto the second gear shaft (123), so that the fifth gear (G5) is positioned so as to be rotatable relative to the third gear (G3) at the lower part of the third gear (G3), thereby reducing the space required for gear placement. This enables the stacked structure of gears as described above because the gear reduction device (120) does not rotate continuously but rotates intermittently at a low speed as needed.

[0054] Referring to FIG. 13, the latch (200) includes a base plate (210) mounted on the door of a laundry dryer, a column portion (220) erected from the base plate (210), a hook portion (250) vertically connected to the front end of the column portion (220), a roller (230) fitted into the hook portion (250), and an E-ring (240) fastened to the hook portion (250) so that the roller (230) does not detach from the hook portion (250).

[0055] The latch (200) configured as described above can reduce the friction load with the catch portion (145) of the latch holder (140) by means of a roller (230) mounted on the hook portion (250), thereby preventing the catch portion (145) of the latch holder (140) from wearing out quickly.

[0057] The door lock device for a laundry dryer according to the present invention as described above can be applied to a washing machine door so that the locking device (100) and the latch (200) can automatically lock or unlock the washing machine door.

[0059] As described above, the present invention has been explained by specific details such as specific components, limited embodiments, and drawings; however, this is provided merely to aid in a more comprehensive understanding of the invention, and the invention is not limited to the above embodiments. A person skilled in the art can make various modifications and variations from this description.

[0060] Accordingly, the scope of the present invention is not limited to the described embodiments, and all things equivalent to or having equivalent variations to the claims set forth below, as well as the claims set forth below, shall be considered to fall within the scope of the concept of the present invention. Explanation of the symbols

[0062] 100 : Locking device 110 : Motor 120: Gear reduction device 130: Lever housing 140: Latch holder 150: Sub-gear 200 : Latch

Claims

Claim 1 A door lock device for a laundry dryer, comprising a locking device (100) mounted on the laundry dryer and a latch (200) mounted on the door and engaged with the locking device (100) to lock, wherein the power of the motor (110) of the locking device (100) is transmitted to the lever tube (130) through the gear reduction device (120), a cylindrical latch holder (140) is fitted into the lever tube (130), and a projection (141) protruding from the rear end of the latch holder (140) engages with a ring portion (132) formed on the outer surface of the lever tube (130), so that the latch holder (140) rotates in the rotational direction of the lever tube (130) by the lever tube (130), a sector gear portion (142) is disposed at the front end of the outer surface of the latch holder (140), and a manually operated sub-gear (150) is on the side of the sector gear portion (142). A door lock device for a laundry dryer characterized by being positioned and having a sector gear section (142) linked to a sub-gear (150). Claim 2 A door lock device for a laundry dryer according to claim 1, wherein the latch holder (140) is formed such that an arc-shaped catch portion (145) protrudes inwardly at the inner circumferential end of the cylindrical portion (147), an access cut-out portion (146) is formed in part of the catch portion (145), a sector gear portion (142) and a locking portion (143) are formed at the outer circumferential end of the cylindrical portion (147), and the sector gear portion (142) is disposed in part of the outer circumferential end of the cylindrical portion (147), and the locking portion (143) is disposed in the remaining part. Claim 3 A door lock device for a laundry dryer according to claim 2, wherein the catch portion (145) is formed in an arc shape and the thickness (t) becomes thicker as it goes from one end (145a) to the other end (145b). Claim 4 A door lock device for a laundry dryer according to claim 2, wherein the latch holder (140) is characterized in that the cylindrical part (147) is fitted into the lever tube (130), so that the front end of the lever tube (130) is caught on the inner surface of the catch part (145), and the front cover (160) is pressed against the front end of the cylindrical part (147), thereby preventing the cylindrical part (147) from moving between the front cover (160) and the lever tube (130). Claim 5 A door lock device for a laundry dryer according to claim 1, wherein an intermediate partition (180) is disposed between a front cover (160) and a case (170), a lever tube (130), a latch holder (140), and a sub-gear (150) disposed on the front of the intermediate partition (180) are covered by the front cover (160), and a motor (110) and a gear reduction device (120) disposed on the back of the intermediate partition (180) are covered by the case (170). Claim 6 In claim 1, the sub-gear (150) has a wrench hole (151b) for manual operation formed on the upper surface of the clutch pinion (151), and the second ratchet gear (153c) of the clutch gear (153) is engaged with the first ratchet gear (151c) of the clutch pinion (151) so as to be coupled in only one direction, the clutch gear (153) is elastically supported by a spring (155), the clutch pinion (151) is rotatably positioned in the auxiliary cylindrical part (161) of the front cover (160), a cylindrical housing (182) is positioned in the intermediate partition (180) in alignment with the auxiliary cylindrical part (161) of the front cover (160), the spring (155) and the clutch gear (153) are positioned in the cylindrical housing (182), and a spur gear (153d) is formed on the upper outer surface of the clutch gear (153). A door lock device for a laundry dryer characterized by being formed such that a spur gear (153d) is coupled with a sector gear (142) of a latch holder (140). Claim 7 A door lock device for a laundry dryer according to claim 6, wherein the clutch pinion (151) has a wrench hole (151b) formed downward from the upper surface of the cylindrical part (151a), a rim (151d) formed at the lower end of the outer circumference of the cylindrical part (151a), an axle projection (151e) protruding downward from the lower surface of the cylindrical part (151a), a first ratchet gear (151c) formed on the lower surface of the cylindrical part (151a), the first ratchet gear (151c) is arranged around the circumference of the axle projection (151d), and the first ratchet gear (151c) includes a vertical part (152a) and an inclined part (152b). Claim 8 In claim 6, the clutch gear (153) has a plurality of ribs (153b) formed in a straight line vertically around the circumference of a cylindrical body (153a) arranged at regular intervals, a spur gear (153d) is formed at the upper end of the cylindrical body (153a) and the spur gear (153d) is coupled with the sector gear (142) of the latch holder (140), a hollow portion (153e) is formed vertically in the cylindrical body (153a) and the shaft projection (151d) of the clutch pinion (151) is fitted into the hollow portion (153e), a second ratchet gear (153c) is formed on the upper surface of the cylindrical body portion (153a), and the vertical portion (154a) of the second ratchet gear (153c) is the first ratchet gear (151c). A door lock device for a laundry dryer characterized by being engaged with a vertical part (152a) and having the lower surface of a cylindrical body (153a) elastically supported by a spring (155). Claim 9 In claim 1, the gear reduction device (120) has a lower worm gear of the first gear (G1) coupled to a worm (111) mounted on the drive shaft of the motor (110), an upper gear of the second gear (G2) coupled to the upper gear of the first gear (G1), an upper gear of the third gear (G3) coupled to the lower gear of the second gear (G2), an upper gear of the fourth gear (G4) coupled to the lower gear of the third gear (G3), an upper gear of the fifth gear (G5) coupled to the lower gear of the fourth gear (G4), and a lower spline shaft (121) of the sixth gear (G6) coupled to the slotting hole (135) of the lever tube (130) on the lower gear of the fifth gear (G5), and the second gear (G2), the fourth gear (G4), and the sixth gear on the first gear shaft (122). A door lock device for a laundry dryer characterized in that gears (G6) are fitted in a stacked order so that the fourth gear (G4) can rotate relative to the second gear (G2) and the sixth gear (G6) can rotate relative to the fourth gear (G4), and the third gear (G3) and the fifth gear (G5) are fitted in a stacked order on the second gear shaft (123) so that the fifth gear (G5) can rotate relative to the third gear (G3). Claim 10 A door lock device for a laundry dryer according to claim 1, wherein the latch (200) comprises a base plate (210) mounted on the door of the laundry dryer, a column portion (220) erected from the base plate (210), a hook portion (250) vertically connected to the front end of the column portion (220), a roller (230) fitted into the hook portion (250), and an E-ring (240) fastened to the hook portion (250) so as not to detach the roller (230) from the hook portion (250). Claim 11 A door lock device for a laundry dryer according to claim 1, characterized in that the locking device (100) and the latch (200) are applied to the washing machine door so as to automatically lock or unlock the washing machine door.

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