KR20070021530A - Drying method of washing and drying machine - Google Patents

Abstract

The present invention relates to a drying method of a combined-use washing machine, comprising: a first drying step in which a drum is rotated at a low speed and hot air is supplied to the inside of the drum such that the cloth fed into the drum is tumbled; The drum is rotated at a high speed so as to closely adhere to the drum, and the second drying step in which the hot air is supplied to the drum is alternately performed to uniformly dry the cloth injected into the drum, thereby improving the drying performance and the wrinkle removal performance of the cloth. There is an advantage.

Drying washing machine, tub, drum, drying duct, condensation duct, heater, blower, temperature sensor

Description

Drying method of washing and drying machine

1 is a cross-sectional view showing a combined dry washing machine according to an embodiment of the present invention,

Figure 2 is a flow chart illustrating a drying method of the combined dry washing machine according to an embodiment of the present invention,

Figure 3 is a state showing the drying operation of the combined dry washing machine according to an embodiment of the present invention,

4 is a cross-sectional view taken along the line A-A of FIG.

5 is a graph showing the change in the detection value of the first and second temperature sensors during drying of the combined washing machine according to an embodiment of the present invention,

6 is a flow chart illustrating a drying method of the combined dry washing machine according to another embodiment of the present invention;

7 is an operating state diagram showing a first drying step of the combined dry washing machine according to another embodiment of the present invention,

8 is an operating state diagram showing a second drying step of the combined dry washing machine according to another embodiment of the present invention,

<Explanation of symbols on main parts of the drawings>

1: dry drum washing machine 2: cabinet

8: Tub 10: Drum

10A: through hole 12: motor

14: lifter 18: door

30: water supply 40: drainage

50: drying duct 52: drying heater

54: blower 60: condensation duct

62: cooling water supply mechanism 70: first temperature sensor

72: second temperature sensor 74: third temperature sensor

The present invention relates to a drying method of a combined-use washing machine, and more particularly, to a drying method of a combined-use washing machine in which the drying performance of a cloth is improved and wrinkles of the cloth can be removed.

In general, a washing machine is a device that washes fabrics by washing, rinsing, and dehydrating to remove contamination from clothes, bedding, etc. (hereinafter, referred to as 'foam') by using water, detergent, and mechanical action. to be.

In particular, recently, a combined washing machine capable of performing not only washing and dehydrating functions of fabrics but also drying functions of fabrics has been released.

Such a combined washing machine is to remove the contamination of the fabric through washing, rinsing, dehydration process and then to dry the fabric to an appropriate level through the drying process.

That is, the dry washing machine is dried by hot air while the dry hot air is supplied to the inside of the drum and the drum is rotated at a low speed while the wet cloth inside the drum is tumbling.

At this time, the hot air flows into the inlet formed in the front part of the drum and flows rearward from the inside of the drum, and then flows in the radial direction of the drum, and the cloth injected into the drum by the hot air is dried, and the cloth The humid air used for drying of the air flows out through a plurality of through holes formed in the drum.

However, according to the related art, the drying method of the combined washing machine according to the prior art is not interrupted by the laundry tumbling by the drum, and thus hot air does not flow deeply to the rear of the drum. There is a problem in that the drying degree of appears different.

That is, the fabric placed in the rear of the drum is undried because it is difficult to contact with the hot air, whereas the fabric placed in the front of the drum is in contact with most of the hot air, resulting in over-drying. .

In addition, the fabric is tangled or agglomerated in the process of washing, rinsing, dehydrating the bar, because the drying process is carried out in a tangled or agglomerated state as described above, the wrinkle is a phenomenon that the wrinkles are severely dried There is this.

The present invention was created in order to solve the above problems, an object of the present invention is that the dry hot air is evenly transmitted to the inside of the drum, the cloth injected into the drum is uniformly dried to improve the drying performance of the combined use washing machine It is to provide a drying method of the combined dry washing machine.

In addition, another object of the present invention is to provide a drying method of a combined washing machine in which the wrinkles of the cloth can be removed by repeating the process of dropping the cloth close to the inner surface of the drum during drying.

One embodiment of the present invention for realizing the above object is a drying method of a dry washing machine in which a hot air is supplied into a drum to dry a cloth injected into the drum, wherein the drum is in close contact with an inner surface of the drum. It is characterized by being rotated at a high speed.

In addition, the drying method of the combined-use washing machine according to another embodiment of the present invention includes a first drying step in which the drum is rotated at a low speed and hot air is supplied to the inside of the drum such that the fabric introduced into the drum is tumbled; The drum is rotated at a high speed so that the fabric is in close contact with the side, characterized in that the second drying step is supplied with hot air to the inside of the drum.

The first drying step and the second drying step are carried out alternately.

In the first drying step and the second drying step, the rotation direction of the drum is reversed at a predetermined cycle.

Alternatively, the drum is rotated in the opposite direction in the first drying step and the second drying step.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a cross-sectional view showing a combined dry washing machine according to an embodiment of the present invention.

Drying washing machine according to an embodiment of the present invention, as shown in Figure 1, the cabinet (2) forming the appearance of the dry washing machine (1), and the elastic member (4) inside the cabinet (2) And a tub 8 provided to be dampened by the damper 6, a drum 10 rotatably installed in the tub 8 and having a plurality of through holes 10A, and the drum 10. A drive motor 12 installed at the rear of the tub 8 so as to rotate, and a lifter 14 installed at the inner side of the drum 10 so as to drop the gun at a predetermined height as the drum 10 rotates. It is configured to include).

Here, the cabinet cover 16 is formed on the front surface of the cabinet (2) is formed with a gun opening and exit 16A, the door 18 for opening and closing the gun opening and exit 16A is installed in the cabinet cover 16 to be rotatable. The gasket 20 is installed between the cloth inlet and outlet 16A and the tub 8 to mitigate an impact caused by the rotation of the drum 10 and to prevent the washing water from overflowing to the outside.

On the upper side of the cabinet cover 16, a display unit for displaying the operation state of the combined-use washing machine 1 is formed, and a control panel 22 having an operation portion for operating the operation of the combined-use washing machine 1 is mounted. do.

In addition, a top plate 24 is mounted on an upper surface of the cabinet 2, and a water supply hose 32 and a water supply valve 34 are provided below the top plate 24 to supply water into the tub 8. A water supply device 30 composed of) is installed.

The detergent supply device 36 is installed on the water supply passage of the water supply device 30 so that detergent may be supplied to the inside of the tub 8 together with the water supplied through the water supply device 30.

In addition, a drainage device 40 consisting of a drain hose 42 and a drain pump 44 is installed at the lower side of the tub 8 to drain the wash water used for washing and rinsing to the outside.

On the other hand, the upper and rear sides of the tub (8) is provided with drying means for drying the cloth injected into the drum (10) with dry hot air, the drying means is hot air dried inside the tub (8) And a condensation duct 60 connected to the drying duct 50 and the tub 8 to discharge the condensation air to remove moisture by condensing air circulated from the tub 8 to the drying duct 50. It is composed of

The drying duct 50 is disposed long in the front-rear direction on the upper side of the tub 8, and the front part is connected in communication with the front upper portion of the tub 8 so as to supply hot air into the drum 10. .

In the drying duct 50, a drying heater 52 is installed to heat the low temperature and low humidity air introduced from the condensation duct 60 to the high temperature and low humidity air, and is heated by the drying heater 52. The blower 54 which blows air to the said tub 8 is provided.

The condensation duct 60 is disposed in the vertical direction long in the rear side of the tub 8, the upper portion is connected to the rear portion of the drying duct 50, and the lower portion is in the lower rear of the tub 8 Are connected in communication.

Inside the condensation duct 60, a cooling water supply mechanism 62 for condensing the humid air introduced from the tub 8 is installed.

In particular, a plurality of temperature sensors are installed in the drying duct 50 and the condensation duct 60 to control the drying operation of the combined washing machine 1.

That is, the first temperature sensor 70 for detecting the temperature of the condensed air flowing into the drying duct 50 is installed in the upper portion of the condensation duct 60, the tub (below) in the lower portion of the condensation duct 60 The second temperature sensor 72 for detecting the temperature of the air flowing into the condensation duct 60 from the 8) is installed, the front of the drying duct 60 of the heated air supplied to the tub (8) A third temperature sensor 74 for sensing the temperature is installed.

Looking at the operation of the combined dry washing machine according to an embodiment of the present invention configured as described above are as follows.

First, after the cloth is introduced into the drum 10 through the cloth inlet 16A of the combined-use washing machine 1, the door 18 is closed to seal the cloth inlet 16A, and the drum 10 is closed. A proper amount of detergent is introduced into the detergent supply device 36 according to the injected cloth.

When the combined-use washing machine 1 is operated and operated, the amount of cloth charged into the drum 10 is sensed, and a cleaning method such as a washing course, a washing time, a water supply level, a rinsing frequency, etc. is set according to the amount of the cloth. .

The water supply valve 34 of the water supply device 30 is opened to supply water to the inside of the tub 8, and the detergent introduced into the detergent supply device 28 is water supplied by the water supply device 30. It is supplied to the tub 8 in a mixed state with.

When the wash water is stored up to the water level set in the tub 8, the drum 10 is inverted left and right by the motor 12 after the water supply valve 34 is sealed to wash the cloth.

At this time, the fabric is raised by a predetermined height by the drum 10 and the lifter 14 and then dropped by gravity, the contamination is removed by the free fall force of the fabric and the cleaning power of the detergent.

When the fabric is washed for a predetermined washing time, the drain pump 44 of the drainage device 40 is driven so that the wash water in the tub 8 is drained out of the drum washing machine 1 through the drain hose 42.

When the washing stroke is completed as described above, the drum 10 is rotated at a high speed by the motor 12 so that the washing water contained in the cloth is centrifugally dewatered.

Then, the water supply valve 34 is opened so that clean water is supplied to the inside of the tub 8 again until the set water supply level, and the drum 10 is inverted left and right by the motor 12 for a set rinsing time. Will be rinsed.

Thereafter, the drain pump 44 of the drainage device 40 is driven so that the water used for rinsing is drained out of the drum washing machine 1 through the drain hose 30.

The rinsing stroke is repeatedly performed several times up to the set rinsing frequency.

When the rinsing stroke as described above is finished, the drum 10 is rotated at a high speed by the motor 14 to completely centrifuge the water of the fabric.

At this time, as the cloth is centrifugally dewatered, water is discharged to the tub 8 through the through hole 10A of the drum 10, and the water discharged to the tub 8 is dried by the drainage device 40. Drained to the outside of the combined-use washing machine (1).

When the dehydration stroke is completed, dry hot air is supplied to the inside of the tub 8 by a drying means and the drum 10 is rotated, thereby drying the dehydrated fabric to a level desired by the user.

2 is a flow chart illustrating a drying method of a combined-use washing machine according to an embodiment of the present invention, Figure 3 is a state diagram showing the drying operation of the combined-use washing machine according to an embodiment of the present invention, Figure 4 3 is a cross-sectional view taken along the line AA, Figure 5 is a graph showing a change in the detection value of the first and second temperature sensors during drying of the combined-use washing machine according to an embodiment of the present invention.

The drying method of the combined-use washing machine according to an embodiment of the present invention will be described in detail with reference to FIGS. 2 to 4 as follows.

First, the detection of the amount of dewatered fabric is carried out in the dehydration stroke, and a drying method such as a drying time, a drying course, etc. is set according to the amount of foam. (See S1)

Then, the blower 54 and the drying heater 52 of the drying duct 50 are driven so that the hot air a generated by the drying heater 52 is inside the tub 8 through the drying duct 50. Is supplied. (See S2)

As described above, the hot air (a) supplied into the tub (8) is introduced into the drum (10) through the inlet formed on the front surface of the drum (10), and introduced into the drum (10). Hot air (a) is to dry the wet cloth.

The humid air (b), which dried the cloth, flows out through the tub (10A) of the drum (10) to the tub (10) and flows into the condensation duct (60), and the moisture introduced into the condensation duct (60). Air (b) is in contact with the cooling water flowing from the cooling water supply mechanism 62 to condense and remove moisture.

The air c from which the moisture is removed from the condensation duct 60 is flowed into the drying duct 50 and then heated again by the drying heater 52.

As described above, a cycle in which air circulates through the drying duct 50, the tub 8, the drum 10, and the condensation duct 60 is repeatedly performed, thereby drying the wet cloth inside the drum 10.

In particular, the third temperature sensor 74 installed in the front portion of the drying duct 50 to detect the temperature of the hot air supplied to the tub 8 during the drying of the hot air of the fabric, the third temperature sensor 74 If the detected value of) is greater than or equal to the set temperature, the operation of the drying heater 52 is stopped.

Accordingly, overheating of the drying heater 52 and thermal damage of the fabric are prevented by the third temperature sensor 74.

On the other hand, when hot air is supplied into the tub 8 to dry the fabric, the drum 10 is rotated at a high speed by the motor 12 so that the fabric adheres to the inner surface of the drum 10. . (See S3)

The rotating ALPM of the drum 10 is an ALPM that does not fall after being in close contact with the inner surface of the carriage drum 10, and corresponds to the dewatering ALPM of the drum 10 during the dehydration stroke.

When the drum 10 is rotated at a high speed as described above, since the fabric is in close contact with the inner surface of the drum 10, a flow passage through which hot air passes at a predetermined size is formed in the middle of the drum 10 in the axial direction.

Therefore, since the hot air (a) flowing into the inlet of the drum 10 smoothly flows to the rear of the drum 10 without being disturbed by the cloth, the air inside the drum 10 is hot air (a). Dry uniformly).

In addition, the hot air (a) introduced into the drum 10 is forcibly exhausted to the through hole (10A) of the drum 10 by the centrifugal force of the drum 10, and through the through hole (10a) hot air ( Drying performance of the fabric is also improved because the fabric adhered to the inner surface of the drum 10 is dried during the forced aeration.

As the fabric inside the drum 10 is dried by hot air as described above, the first temperature sensor 70 and the second temperature sensor 72 installed in the condensation duct 60 have an upper temperature T1 of the condensation duct 60. ) And the lower temperature (T2) are respectively sensed to determine the end point of the hot air drying. (See S4, S5)

That is, as shown in FIG. 5, in the initial stage of drying, the temperature sensing values T1 and T2 of the first temperature sensor 70 and the second temperature sensor 72 converge and rise to almost similar values, and are dried. In the mid-term, the temperature sensing values T1 and T2 of the first temperature sensor 70 and the second temperature sensor 72 are substantially similar, and are maintained at a constant temperature band. At the end of drying, the first temperature sensor 70 ) Is lowered while the temperature detection value T2 of the second temperature sensor 72 becomes high, so that the temperature difference between the first temperature sensor 70 and the second temperature sensor 72 is increased. (ΔT) is greatly increased.

If the temperature difference ΔT between the first temperature sensor 70 and the second temperature sensor 72 is greater than or equal to a set value, it is determined that the fabric is dried to a desired level and the hot air drying is automatically terminated.

Of course, the combined-use washing machine 1 can also be manually controlled after the hot air drying is completed by a time set by the user through the control panel 22. However, the manual control is relatively over-drying than the automatic control. Risk of becoming undried or undried.

In the present embodiment, the drying stroke is automatically controlled by the first temperature sensor 70 and the second temperature sensor 72.

As described above, when the hot air drying is terminated at the correct time by the detection values T1 and T2 of the first temperature sensor 70 and the second temperature sensor 72, the drum 10 is rotated at a low speed while the cold air is rotated. Drying is carried out for a predetermined time. (See S6, S7)

That is, the cold air drying is carried out for the purpose of preventing the risk of burns due to the high temperature of the cloth when taking out the dried cloth from the combined-use washing machine 1, the operation of the drying heater 52 In the stopped state, only the blower 54 is driven for a predetermined time so that the temperature of the fabric dried by the cold air supplied from the drying duct 50 is lowered.

In addition, the rotating ALPM of the drum 10 is an AlMP not generated in close contact with the inner surface of the carriage drum 10, and as the drum 10 rotates at a low speed, the inside of the drum 10 is reduced. After the cloth close to the side falls, the cloth is released as it is tumbling.

6 is a flowchart illustrating a drying method of a combined-use washing machine according to another embodiment of the present invention, and FIG. 7 is an operating state diagram illustrating a first drying step of the combined-use washing machine according to another embodiment of the present invention. 8 is an operational state diagram illustrating a second drying step of the combined washing machine according to another embodiment of the present invention.

For reference, the same reference numerals are given to the same or similar constituent elements, and a detailed description thereof will be omitted.

6 to 8, the drying method according to another embodiment of the present invention, as shown in Figures 6 to 8, the detection of the amount of dehydrated fabric in the dehydration stroke is carried out according to the amount of drying time, drying course, etc. A drying method is set, and the blower 54 and the drying heater 52 of the drying duct 50 are driven so that the hot air a generated by the drying heater 52 is passed through the drying duct 50 through the tub ( 8) is supplied into the interior. (See S11, S12)

As described above, the hot air (a) supplied into the tub (8) is introduced into the drum (10) through the inlet formed on the front surface of the drum (10), and introduced into the drum (10). Hot air (a) is to dry the wet cloth.

In addition, the damp air (b), which dried the cloth, flows out of the tub 10 through the through hole 10A of the drum 10 and flows into the condensation duct 60, and flows into the condensation duct 60. The moist air b thus comes into contact with the cooling water flowing from the cooling water supply mechanism 62 to condense and remove moisture.

The air c from which the moisture is removed from the condensation duct 60 is flowed into the drying duct 50 and then heated again by the drying heater 52.

As described above, a cycle in which air circulates through the drying duct 50, the tub 8, the drum 10, and the condensation duct 60 is repeatedly performed, thereby drying the wet fabric inside the drum 10.

In particular, the third temperature sensor 74 installed in the front portion of the drying duct 50 to detect the temperature of the hot air supplied to the tub 8 during the drying of the hot air of the fabric, the third temperature sensor 74 If the detected value of) is greater than or equal to the set temperature, the operation of the drying heater 52 is stopped.

Accordingly, overheating of the drying heater 52 and thermal damage of the fabric are prevented by the third temperature sensor 74.

On the other hand, when hot air is supplied into the tub 8 to dry the fabric, the drum 10 is alternately rotated at a low speed and a high speed by the motor 12. (See S13,14)

That is, the hot air drying is a first drying step in which hot air is supplied into the drum 10 while the drum 10 is rotated at a low speed, and the drum 10 is rotated at a high speed. It consists of a second drying step of supplying hot air therein.

In the first drying step, as shown in FIG. 7, the drum 10 is rotated at a low speed with a rotary AlMP in which a bubble flow is generated without contacting an inner surface of the drum 10, whereby the drum 10 is rotated. The fabric is dried by the hot air (a) flowing into the inlet of the drum 10 while the fabric injected into the interior of the tumbled.

As described above, when the drum 10 is rotated at a low speed and the fabric is tumbled, not only the cloth is unfolded and released, but also the area in which the hot air a and the cloth contact each other is greatly increased.

On the other hand, since the hot air (a) introduced into the inlet of the drum 10 is difficult to flow due to the tumbling cloth, the hot air (a) is not sufficiently flowed to the rear of the drum 10, the drum 10 The cloth disposed on the rear side of the fabric has poor drying performance.

In the second drying step, as shown in FIG. 8, the drum 10 is rotated at a high speed with a rotary AlMP in which the cloth is in close contact with the inner surface of the drum 10, whereby the bag is closely adhered to the inner surface of the drum 10. The cloth is dried by the hot air (a) flowing into the inlet of the drum 10 in a closed state.

When the drum 10 is rotated at a high speed as described above, since the fabric is in close contact with the inner surface of the drum 10, a flow passage through which hot air passes through a predetermined size is formed in the middle of the drum 10 in the axial direction. .

Therefore, unlike the first drying step, the second drying step smoothly flows to the rear of the drum 10 without being disturbed by the cloth because the hot air a introduced into the inlet of the drum 10 is not disturbed. The inside of the drum 10 is uniformly dried by the hot air a so that the drying performance of the combined washing machine 1 is improved.

In addition, the hot air (a) introduced into the drum 10 is forcibly exhausted to the through hole (10A) of the drum 10 by the centrifugal force of the drum 10, and through the through hole (10a) hot air ( Drying performance of the fabric is improved because the fabric adhered to the inner surface of the drum 10 is dried during the forced aeration.

On the other hand, the first drying step and the second drying step are carried out alternately.

That is, since the fabric released in the first drying step is in close contact with the inner surface of the drum 10 in the second drying step, and the fabric adhered in the second drying step is loosened while being tumbling in the first drying step, the fabrics are bundled Repeating and loosening is repeated to effectively remove the wrinkles of the fabric.

When the first drying step and the second drying step are repeatedly performed as described above, the drum 10 may be further improved in the first drying step and the second drying step to further improve the drying performance and the wrinkle removal performance of the fabric. ) Are rotated in opposite directions or the rotation direction of the drum 10 is reversed at regular intervals.

That is, as shown in FIG. 7 and FIG. 8, the drum 10 is rotated counterclockwise in the first drying step, and the drum 10 is rotated clockwise in the second drying step. Of course, the drum 10 may be rotated clockwise in the first drying step, and the drum 10 may be rotated counterclockwise in the second drying step.

In addition, unlike the above, the first drying step and the second drying step may be performed alternately up to a set number of times while the drum 10 is rotated in one direction, the rotation direction of the drum 10 may be reversed.

As described above, the first drying step and the second drying step are alternately performed, and the first temperature sensor 70 and the second temperature installed in the condensation duct 60 are dried as the fabric inside the drum 10 is dried by hot air. The sensor 72 detects an upper temperature T1 and a lower temperature T2 of the condensation duct 60 to determine an end point of the hot air drying. (See S15, S16)

That is, if the temperature difference ΔT between the first temperature sensor 70 and the second temperature sensor 72 is greater than or equal to a set value, the fabric is determined to be dried to a desired level and the hot air drying is automatically terminated.

As described above, when the hot air drying is terminated at the correct time by the detection values T1 and T2 of the first temperature sensor 70 and the second temperature sensor 72, the drum 10 is rotated at a low speed while the cold air is rotated. Drying is carried out for a predetermined time. (See S17, S18)

That is, the cold air drying is carried out for the purpose of preventing the risk of burns due to the high temperature of the cloth when taking out the dried cloth from the combined-use washing machine 1, the operation of the drying heater 52 In the stopped state, only the blower 54 is driven for a predetermined time so that the temperature of the fabric dried by the cold air supplied from the drying duct 50 is lowered.

In addition, the rotating ALPM of the drum 10 is an AlMP not generated in close contact with the inner surface of the carriage drum 10, and as the drum 10 rotates at a low speed, the inside of the drum 10 is reduced. After the cloth close to the side falls, the cloth is released as it is tumbling.

As described above, the drying method of the combined-use washing machine according to the present invention has been described with reference to the illustrated drawings. However, the present invention is not limited to the above-described embodiments and drawings, and various modifications may be made by those skilled in the art within the technical scope of the present invention. Of course, variations are possible.

In the drying method of the combined-use washing machine according to the present invention configured as described above, since the drum is rotated at high speed so that the cloth is in close contact with the inner surface of the drum during drying, a flow passage through which hot air passes is formed in the middle of the drum, There is an advantage that the hot air is evenly transmitted inside.

In addition, since the hot air is evenly transmitted to the inside of the drum, the cloth in the drum is uniformly dried, there is an advantage that the drying performance of the combined-use washing machine is improved.

In addition, as the drum is rotated at a high speed, hot air is forcedly exhausted into the through hole of the drum by the centrifugal force of the drum, so that the cloth closely adhered to the inner surface of the drum is effectively dried by the hot air.

In addition, the first drying step in which the hot air is supplied to the inside of the drum while the drum rotates at a low speed during drying, and the second drying step in which the hot air is supplied to the inside of the drum while the drum is rotated at a high speed are alternately performed. In the first drying step and the second drying step, the fabric is released and then closely adhered to the process, so that the wrinkles of the fabric are effectively removed.

Claims (5)

In the drying method of a dry washing machine, in which hot air is supplied into a drum to dry a cloth fed into the drum, Drying method of a combined washing machine, characterized in that the drum is rotated at high speed so that the cloth is in close contact with the inner surface of the drum. A first drying step in which the drum is rotated at a low speed so that the cloth introduced into the drum is tumbled and hot air is supplied to the inside of the drum; And a second drying step of rotating the drum at a high speed so that the cloth is in close contact with the inner surface of the drum and supplying hot air to the inside of the drum. The method according to claim 2, The first drying step and the second drying step drying method of a combined washing machine characterized in that it is carried out alternately. The method according to claim 3, The first drying step and the second drying step drying method of the combined washing machine, characterized in that the rotation direction of the drum is reversed at a predetermined cycle. The method according to claim 2 or 3, In the first drying step and the second drying step, the drum drying method characterized in that the drum is rotated in the opposite direction.

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