Patent Publication Number: US-6219879-B1

Title: Cylinder cleaning device

Description:
This is a divisional of application Ser. No. 08/883,063 filed Jun. 26, 1997, now U.S. Pat. No. 6,041,711, which is herein incorporated by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to a cylinder cleaning device for cleaning the outer surface of a cylinder in an offset printing press, such as a blanket cylinder, an impression cylinder, a plate cylinder, or an inking cylinder. More particularly, the invention relates to a cylinder cleaning device for use with a cleaning fabric supply roll having a cleaning fabric wound thereon, the cleaning fabric being supplied from the supply roll and pressed against the outer surface of the cylinder to clean the outer surface of the cylinder. 
     2. Description of Related Art 
     In a cylinder cleaning device for cleaning the outer surface of a cylinder in an offset printing press, such as a blanket cylinder, there has been generally used a cleaning fabric supply roll having a core about which a cleaning fabric is wound. The device further includes a rigid metal shaft fitted into the core. The shaft is mounted at opposite ends on a frame in the device to support the supply roll for rotation so that the cleaning fabric can be supplied from the supply roll and pressed against the outer surface of the cylinder to clean the outer surface. However, since the shaft is long and heavy, it is troublesome to insert and fit the shaft into the core and then mount the shaft on the frame. Labour and time are required. In addition, a certain device can use only the supply roll having the core which is adapted to fit the shaft of the device, the supply roll and the core being limited in size. Not every supply roll can be used. 
     There has been also proposed a cylinder cleaning device as disclosed in Japanese Laid-Open Patent Publication No. 234,659 of 1992, in which the the core is directly mounted and held at opposite ends on the frame to support the supply roll for rotation without using the metal shaft. However, in the device, the supply roll has merely a poor rigidness due to lack of the shaft. Accordingly, the center of supply roll may deflect so that the cleaning fabric can not be uniformly supplied. In addition, the core and the supply roll may be disengaged from the frame to fall off. A certain device can use only the supply roll having the core which is adapted to be mounted and held on the frame, the supply roll and the core being limited in size. 
     In order to overcome the above problems, an attempt has been made to provide a cylinder cleaning device in which the outer surface of the supply roll is engaged with and received by a cross beam to support the supply roll for rotation, the cross beam being mounted on the frame in the device. However, the supply roll can not be stabilized on the cross beam by merely engaging the outer surface of the supply roll with the cross beam. The supply roll may vibratingly move along the cross beam and bounce from the cross beam when the the supply roll is rotated on the cross beam to supply the cleaning fabric. The cleaning fabric can not therefore be uniformly supplied. 
     By the way, the cleaning fabric may have one surface made of pulp which is intended to be bought into contact with the outer surface of the cylinder for cleaning, and the other surface made of polyester fibers for reinforcing the cleaning fabric. Under these circumferences, it is required to properly set up the supply roll in the device to conveniently supply the cleaning fabric from the supply roll so that not the other surface but the one surface of the cleaning fabric is bought into contact with the outer surface of the cylinder. If an operator conversely positions the opposite ends of the supply roll by mistake when set up, the cleaning fabric will be directed from the supply roll so that the other surface is bought into contact with the outer surface of the cylinder. This has a problem that the polyester fibers adhere to the outer surface of the cylinder to lower the quality of printed product. 
     It is therefore an object of the invention to provide a new and improved cylinder cleaning device, in which the above problems can be overcome. 
     Another object of the invention is to provide a cylinder cleaning device in which it is easy to set up the supply roll in the device without labor and time. 
     Other object of the invention is to provide a cylinder cleaning device in which any supply roll can be used irrespectively of the size of the supply roll and the core. 
     Other object of the invention is to provide a cylinder cleaning device in which a supply roll can be used even if it has no core. 
     Other object of the invention is to provide a cylinder cleaning device in which the supply roll is stabilized when rotated so that the cleaning fabric can be uniformly supplied from the supply roll. 
     Other object of the invention is to provide a cylinder cleaning device which is intended to properly set up the supply roll to conveniently supply the cleaning fabric from the supply roll. 
     Other object of the invention is to provide a cleaning fabric supply roll for preventing the operator from conversely positioning the opposite ends of the supply roll by mistake when set up. 
     SUMMARY OF THE INVENTION 
     According to the invention, there is provided a cylinder cleaning device for use with a cleaning fabric supply roll having a cleaning fabric wound thereon. The cleaning fabric is supplied from the supply roll and pressed against the outer surface of a cylinder to clean the outer surface of the cylinder. 
     The device comprises frame means and roll receiving means mounted on the frame means. The outer surface of the supply roll is engaged with and received by the receiving means. The device further comprises roll stabilizing means for stabilizing the supply roll on the receiving means when the supply roll is rotated on the receiving means to supply the cleaning fabric and have a diameter correspondingly decreasing. 
     In a preferred embodiment, the supply roll has a core about which the cleaning fabric is wound. The stabilizing means comprises guide means for guiding the core for movement toward the receiving means in accordance with the decrease in diameter of the supply roll to stabilize the supply roll on the receiving means. 
     The receiving means may comprise a cross beam mounted on the frame means. The outer surface of the supply roll is engaged with and received by the cross beam to support the supply roll for rotation. The stabilizing means comprises guide means for guiding the core for movement toward the cross beam in accordance with the decrease in diameter of the supply roll, and movable member means opposed to the cross beam, engaged with the outer surface of the supply roll and moved toward the cross beam in accordance with the decrease in diameter of the supply roll. 
     In another embodiment, the stabilizing means further comprises resiliently urging means for resiliently urging the movable member means toward the receiving means. The supply roll is supported on the movable member means for rotation by the resiliently urging means. 
     In another embodiment, the supply roll is sandwiched between the movable member means and the cross beam. The movable member means, the guide means and the cross beam cooperate with each other to support the supply roll for rotation. 
     According to the invention, there is also provided a cleaning fabric supply roll having a cleaning fabric wound about a core to form an outer surface to be engaged and received. The supply roll comprises projections extending coaxially with the core and projecting from the opposite end surfaces of the supply roll respectively. The supply roll further comprises distinguishing means for distinguishing the projections from each other. The distinguishing means may comprise the projections which are different in length, color, diameter or material from each other. 
     In another embodiment, the outer surface of the supply roll is engaged with and received by the cross beam to support the supply roll for rotation. The stabilizing means is opposed to the cross beam and engaged with the outer surface of the supply roll to sandwich and stabilize the supply roll between the stabilizing means and the cross beam. 
     In another embodiment, the frame means comprises a pair of side frames. The cross beam is disposed between and mounted on the side frames. The outer surface of the supply roll is engaged with and received by the cross beam to support the supply roll for rotation, the stabilizing means being opposed to the cross beam, mounted on arm means and engaged with the outer surface of the supply roll. The arm means is supported at one end for swinging movement to move the stabilizing means toward the cross beam in accordance with the decrease in diameter of the supply roll. The arm means includes bar means mounted thereon and extending parallel to the cross beam. A passage is formed between the cross beam and the bar means so that the cleaning fabric is fed through the passage from the supply roll. 
     The stabilizing means may comprises a first elongated member supported on the arm means and a second elongated member disposed between the first elongated member and the bar means. The second elongated member is mounted on additional arm means supported on the bar means. The additional arm means is swingingly moved about the bar means toward the supply roll so that the second elongated member is engaged with the outer surface of the supply roll. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an explanatory view of a cleaning fabric supply roll according to the invention. 
     FIG. 2 is an elevational view of the supply roll of FIG.  1 . 
     FIG. 3 is an explanatory view of another supply roll according to the invention. 
     FIG. 4 is a sectional view of the supply roll of FIG.  3 . 
     FIG. 5 is an elevetional view of another supply roll according to the invention. 
     FIG. 6 is a side view of a preferred embodiment of the invention. 
     FIG. 7 is a plan view of the guide means of FIG.  6 . 
     FIG. 8 is a plan view of the movable member of FIG.  6 . 
     FIG. 9 is an elevational view of the detecting means of FIG.  8 . 
     FIG. 10 is a side view of another embodiment. 
     FIG. 11 is a side view of another embodiment. 
     FIG. 12 is a side view of another embodiment. 
     FIG. 13 is a side view of another embodiment. 
     FIG. 14 is a side view of another embodiment. 
     FIG. 15 is a side view of another embodiment. 
     FIG. 16 is a sectional plan view of the device of FIG.  15 . 
     FIG. 17 is a side view showing a rod retracted from a path along which an arm is swingingly moved in FIG.  15 . 
     FIG. 18 is a side view showing the rod advanced into the path in FIG.  17 . 
     FIG. 19 is a side view showing the rod preventing the arm from reversely moving in FIG.  18 . 
     FIG. 20 is a side view of another embodiment. 
     FIG. 21 is an elevational view of one half of the device of FIG.  20 . 
     FIG. 22 is an elevational view of the other half of the device of FIG.  20 . 
     FIG. 23 is a sectional view taken along line A—A in FIG.  22 . 
     FIG. 24 is a sectional view taken along line B—B in FIG.  22 . 
     FIG. 25 is a side view of a cleaning fabric supply roll of FIG. 20 which is being set up in the device. 
     FIG. 26 is a side view of the supply roll of FIG. 25 which has been set up in the device. 
     FIG. 27 is a side view of the supply roll of FIG. 26 having a diameter decreasing. 
     FIG. 28 is a side view of the supply roll of FIG. 27 having the diameter more decreasing. 
     FIG. 29 is a perspective view of another embodiment. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring to FIG. 1, a cleaning fabric supply roll  2  according to the invention is shown, which is used in a cylinder cleaning device. The device comprises frame means and roll receiving means mounted on the frame means. The outer surface of the supply roll  2  is engaged with and received by the receiving means. 
     The supply roll  2  has a core  4  about which a cleaning fabric  6  is wound. The core  4  may be hollow and tube-shaped. The core  4  may comprise a solid rod. The cleaning fabric  6  may be an ordinary fabric, a non-woven fabric, a paper, a plastic film or the like. In addition, the cleaning fabric  6  may be previously impregnated with a cleaning agent or detergent. The cleaning fabric may then packaged in a vacuum pack. The cleaning fabric may have a detergent in the form of jelly or paste applied onto the cleaning fabric. 
     The cleaning fabric  6  is supplied from the supply roll  2  and pressed against the outer surface of a cylinder to clean the outer surface of the cylinder. The device further comprises roll stabilizing means for stabilizing the supply roll  2  on the receiving means when the supply roll  2  is rotated on the receiving means to supply the cleaning fabric  6  and have a diameter correspondingly decreasing. In the embodiment, the stabilizing means comprises guide means for guiding the core  4  for movement toward the receiving means in accordance with the decrease in diameter of the supply roll  2  to stabilize the supply roll  2  on the receiving means. 
     The guide-means comprises first and second guide portions in the form of side blocks  8 A and  8 B mounted on the frame of the device. The side blocks  8 A and  8 B are L-shaped each including a vertical portion  10  and a horizontal portion  12 . The side blocks  8 A and  8 B further include plates  14  in which slots  16  are formed respectively. The plates  14  are disposed parallel and opposite to each other and attached to the edges of the horizontal portions  12  to cooperate with the vertical portions  10  and the horizontal portions  12  to form channels  18 . The plates  14  are spaced from each other at a distance corresponding to the length of the supply roll  2 . 
     The stabilizing means further comprises projections extending coaxially with the core  4  and projecting from the opposite end surfaces of the supply roll  2  respectively. The projections comprise the extensions  20 A and  20 B of the core  4 , as shown in FIG.  2 . The projections  20 A and  20 B are inserted in the slots  16  and received in the channels  18  in the side blocks  8 A and  8 B for movement along the slots  16 . The slots  16  extend toward the receiving means for guiding the core  4  for movement toward the receiving means. In addition, the supply roll  2  includes distinguishing means for distinguishing the projections  20 A and  20 B from each other. In the embodiment, the distinguishing means comprises the projections  20 A and  20 B which are different in length from each other. In this connection, the channels  18  are different in width from each other so that the operator has to set up the long projection  20 A on the side block  8 A and set up the short projection  20 B on the side block  8 B. The side block  8 B is not capable of setting up the long projection  20 A. This prevents the operator from conversely positioning the opposite ends of the supply roll  2  by mistake when set up the supply roll  2  in the device. The operator is obliged to properly set up the supply roll  2  in the device to conveniently supply the cleaning fabric  6  from the supply roll  2 . 
     The stabilizing means further comprise a pair of movable members  22 A and  22 B which are inserted into the channels  18  and engaged with the projections  20 A and  20 B. The movable members  22 A and  22 B can be moved toward the receiving means in accordance with the decrease in diameter of the supply roll  2 . Resiliently urging means such as a spring is provided for resiliently urging the movable members  22 A and  22 B toward the receiving means. 
     Accordingly, the projections  20 A and  20 B cooperate with the slots  16  to prevent the supply roll  2  from vibratingly moving along the receiving means. The projections  20 A and  20 B cooperate with the movable members  22 A and  22 B and the resiliently urging means to prevent the supply roll  2  from bouncing from the receiving means. The cleaning fabric  6  can therefore be uniformly supplied. 
     One of the side blocks  8 B includes detecting means such as a switch  24 . The movable member  22 B extends to a position in which the switch  24  is disposed, to contact and activate the switch  24 . Accordingly, the switch  24  is activated by the movement of the core  4  and the movable member  22 B to detect the residual of the cleaning fabric  6  of the supply roll  2 . The switch  24  generates a signal for electrical indication if the residual of the cleaning fabric  6  decreases to a small amount. In this connection, the projections  20 A and  20 B prevent the supply roll  2  from vibratingly moving along the receiving means and bouncing from the receiving means as described above, to precisely detect the residual of the cleaning fabric  6  of the supply roll  2  with no error signal from the switch  24 . 
     The projections may comprise projecting members  26 A and  26 B fixed to the movable members  22 A and  22 B, as shown in FIG.  3 . The supply roll  2  includes holes  28 A and  28 B formed in the opposite ends thereof, as shown in FIG. 4, the projections  26 A and  26 B being press fitted into the holes  28 A and  28 B and connected to the core  30 . The projections  26 A and  26 B are different in length from each other, the holes  28 A and  28 B being different in length from each other so that the operator has to set up the long projection  26 A in the long hole  28 A and set up the short projection  26 B in the short hole  28 B. The short hole  28 B is not capable of setting the long projection  26 A. In other embodiments, the distinguishing means may comprise the projections which are different in color from each other. The projections may be partially or totally colored to be partially or totally different in color from each other. The distinguishing means may comprise the projections  26 A and  26 B which are different in diameter from each other as shown in FIG. 5, the holes being different in diameter from each other so that the operator has to set up the large projection  26 A in the large hole and set up the small projection  26 B in the small hole. The distinguishing means may comprise the projections which are different in material from each other. The projections may be connected to the core by screwing or glueing. The projections may comprise a member extending through the core. 
     In a preferred embodiment of the invention shown in FIG. 6, the cleaning fabric  6  is directed from the supply roll  2  to a take up shaft  32  through a pressure pad  34 . The take up shaft  32  is rotationally driven by drive means such as a motor or cylinder to take up the cleaning fabric  6  about the take up shaft  32  so that the cleaning fabric  6  is intermittently supplied from the supply roll  2  to the pressure pad  34 . The cleaning fabric  6  is then pressed against the outer surface of the cylinder by the pressure pad  34  to clean the outer surface of the cylinder. 
     In the device in FIG. 6, the frame means comprises a pair of side frames  36 . The outer surface of the supply roll  2  is engaged with and received by the receiving means which comprises a cross beam  38  disposed between and mounted on the side frames  36 . The guide means comprises a pair of side blocks  40 A and  40 B mounted on the side frames  36 , as shown in FIG.  7 . The side blocks  40 A and  40 B each includes a slot  42 A and  42 B formed therein. The supply roll  2  includes the projections  20 A and  20 B comprising the extensions of the core  4  and inserted in the slots  42 A and  42 B. The slots  42 A and  42 B are different in depth from each other which correspond to the lengths of the projections  20 A and  20 B. The slots  42 A and  42 B extend toward the cross beam  38  for guiding the core  4  for movement toward the cross beam  38  in accordance with the decrease in diameter of the supply roll  2  to stabilize the supply roll  2  on the cross beam  38 . 
     As to the cleaning fabric  6  wound on the supply roll  2  in the device in FIG. 6, the cleaning fabric  2  has an inner surface or one surface which is made of pulp and intended to be bought into contact with the outer surface of the cylinder for cleaning, and an outer surface or the other surface which is made of polyester for reinforcing the cleaning fabric  6 . The operator is obliged to properly set up the supply roll  2  in the device to conveniently supply the cleaning fabric  6  from the supply roll  2  so that not the other surface but the one surface of the cleaning fabric  6  is bought into contact with the outer surface of the cylinder. 
     The device further includes movable member means which comprises a rotatable roller  44  opposed to the cross beam  38 , mounted on a pair of arms  46  and engaged with the outer surface of the supply roll  2 . The arms  46  are fixed to and supported on shafts  48  which are mounted on the side frames  36  for rotation, as shown in FIG. 8, so that the roller  44  and the arms  46  can be swingingly moved about the shafts  48  toward the cross beam  38  in accordance with the decrease in diameter of the supply roll  2 . The shafts  48  each includes resiliently urging means comprising a spring  50  provided thereabout. The springs  50  are engaged at one end with the arms  46  and engaged at the other end with stops  52  to resiliently urge the arms  46  and the roller  44  toward the cross beam  38  so that the roller  44  prevents the supply roll  2  from bouncing from the cross beam  38 . The stops  52  are mounted on the side frames  36 . Spacers  54  are disposed around the shafts  48  between the springs  50  and the side frames  36 . 
     The shafts  48  are disposed in a position through which the cleaning fabric  6  is fed from the supply roll  2 . The device further includes preventing member means comprising a bar  56  which is disposed parallel and adjacent to the shafts  48  between the arms  46  and mounted on the arms  46 . Accordingly, the bar  56  narrows the passage of the cleaning fabric  6  when the supply roll  2  decreases in diameter, as shown in FIG.  6 (B), for preventing the supply roll  2  from disengaging from the cross beam  38 . 
     One of the shafts  48  includes a cam  58  which is opposed to and engaged with detecting means comprising a switch  60 . The cam  58  rotates integrally with the shaft  48  and has a cut off surface  62  by which the switch  60  is activated, as shown in FIG.  9 . Accordingly, the switch  60  is activated by the rotation of the shaft  48  to detect the residual of the cleaning fabric  6  of the supply roll  2 . The switch  60  generates a signal for electrical indication if the residual of the cleaning fabric  6  decreases to a small amount. 
     In other embodiment shown in FIG. 10, the projections  20 A and  20 B are moved along the slots  42 A and  42 B in the side blocks  40 A and  40 B which extend downwardly. Movable member means comprises rockers  64  which are fixed to and mounted on shafts  66 . Springs are engaged with the shafts  66  to resiliently urge the shaft  66  and the rockers  64  for rotation so that the rockers  64  are engaged with the projections  20 A and  20 B, as shown in FIG.  10 (B). 
     In other embodiment shown in FIG. 11, the stabilizing means comprises movable member means including a pair of rollers  68  and  70  which are opposed to the cross beam  38  and engaged with the outer surface of the supply roll  2 . The movable member means further includes a pair of arms  72  which are fixed at one end to shafts  74  extending longitudinally of the supply roll  2 . The shafts  74  are mounted on the side frames  36  for rotation so that the arms  72  are supported at one end by the side frames  36  for swingingly movement. The rollers  68  and  70  are disposed between the arms  72 , spaced from each other longitudinally of the arms  72  and mounted on the arms  72 . Accordingly, the arms  72  and the rollers  68  and  70  can be moved toward the cross beam  38  in accordance with the decrease in diameter of the supply roll  2 . In addition, resiliently urging means such as springs are engaged with the shafts  74  for resiliently urging the arms  72  and the rollers  68  and  70  toward the cross beam  38  so that the supply roll  2  is supported on the rollers  68  and  70  for rotation by the resiliently urging means. The rollers  68  and  70  are spaced from each other at a distance slightly larger than the diameter of the core  4 . Accordingly, the supply roll  2  is held between the rollers  68  and  70  and the cross beam  38  when the supply roll  2  decreases in diameter, as shown in FIG.  11 (B), to prevent the supply roll  2  from vibratingly moving along the cross beam  38  and bouncing from the cross beam  38 . 
     In the device in FIG. 11, the side blocks  40 A and  40 B each includes the slot  42 A and  42 B extending horizontally toward the cross beam  38 . The slot  42 A and  42 B includes a resilient preventing member  76  disposed in the opening of the slot  42 A and  42 B. The preventing member  76  is pushed and deformed by the projection  20 A and  20 B when the projection  20 A and  20 B is inserted into the slot  42 A and  42 B. The preventing member  76  is then restored to the original state to prevent the core  4  from being detached. In addition, a bar  78  is disposed parallel and adjacent to the shaft  74  to form a passage between the shaft  74  and the bar  78  so that the cleaning fabric  6  is fed through the passage from the supply roll  2 . The passage has a width less than the diameter of the core  4  to prevent the supply roll  2  from disengaging from the cross beam  38 . 
     In other embodiment shown in FIG. 12, the stabilizing means comprises movable member means including a roller  80  which are opposed to the cross beam  38  and engaged with the outer surface of the supply roll  2 . The movable member means further includes a pair of arms  82  which are fixed at one end to shafts  84  extending longitudinally of the supply roll  2 . The shafts  84  are mounted on the side frames  36  for rotation so that the arms  82  are supported at one end by the side frames  36  for swingingly movement. The roller  80  is disposed between and mounted on the arms  82 . Accordingly, the arms  82  and the roller  80  can be moved toward the cross beam  38  in accordance with the decrease in diameter of the supply roll  2 . In addition, resiliently urging means such as springs are engaged with the shafts  84  for resiliently urging the arms  82  and the roller  80  toward the cross beam  38 . The side blocks  40 A and  40 B each includes the slot  42 A and  42 B in which the projection  20 A and  20 B is inserted. The slot  42 A and  42 B extends along a circular arc centered at the shaft  84  so that the roller  80 , the side blocks  40 A and  40 B and the cross beam  38  cooperate with each other to support the supply roll  2  for rotation. The shaft  84  is disposed parallel and adjacent to the cross beam  38  to form a passage between the cross beam  38  and the shaft  84  so that the cleaning fabric  6  is fed through the passage from the supply roll  2 . The passage has a width less than the diameter of the core  4  to prevent the supply roll  2  from disengaging from the cross beam  38  when the supply roll  2  decreases in diameter, as shown in FIG.  12 (B). 
     In other embodiment shown in FIG. 13, a pair of rollers  80  and  86  are spaced from each other longitudinally of the arms  82 , mounted on the arms  82  and engaged with the outer surface of the supply roll  2 . The rollers  80  and  86  are spaced from each other at a distance slightly larger than the diameter of the core  4 . 
     In other embodiment shown in FIG. 14, the slot  42 A and  42 B extends vertically toward the cross beam  38 . The rollers  80  and  86  are engaged with the outer surface of the supply roll  2  to support the supply roll  2  for rotation. A preventing block  88  is disposed adjacent to the cross beam  38  and mounted on a bracket  90  to form a passage through which the cleaning fabric  6  is fed from the supply roll  2 . The preventing block  88  prevents the supply roll  2  from disengaging from the cross beam  38 . 
     In other embodiment shown in FIG. 15, the take up shaft  32  is rotationally driven by a cylinder which is connected to the take up shaft  32  through a lever  92  and a one-way clutch  94 , as shown in FIG. 16, to take up the cleaning fabric  6  about the take up shaft  32 . Accordingly, the cleaning fabric  6  is intermittently supplied from the supply roll  2  to the pressure pad  34 . The cleaning fabric  6  is then pressed against the outer surface of the cylinder by the pressure pad  34  to clean the outer surface of the cylinder. 
     As to the cleaning fabric  6  wound on the supply roll  2  in the device in FIG. 15, the cleaning fabric  6  has an outer surface or one surface which is made of pulp and intended to be bought into contact with the outer surface of the cylinder for cleaning, and an inner surface or the other surface which is made of polyester for reinforcing the cleaning fabric  6 . The operator properly sets up the supply roll  2  in the device to conveniently supply the cleaning fabric  6  from the supply roll  2  so that the one surface of the cleaning fabric  6  is bought into contact with the outer surface of the cylinder. 
     In the device in FIG. 15, the stabilizing means is opposed to the cross beam  38  and engaged with the outer surface of the supply roll  2  to sandwich and stabilize the supply roll  2  between the stabilizing means and the cross beam  38 . The stabilizing means includes a pair of engaged members  96 , and  98  spaced from each other circumferentially of the supply roll  2  and engaged with the outer surface of the supply roll  2 . A pair of arms  100  are supported at ends on a shaft  102 , the engaged members  96  and  98  being each disposed between and mounted on a pair of plates  104  which are mounted on the other ends of the arms  100  for swinging movement. The stabilizing means further includes resiliently urging means such as springs  106  for resiliently urging the arms  100  to press the engaged members  96  and  98  against the outer surface of the supply roll  2 . The engaged members  96  and  98  each comprises a rotatable roller. The engaged members  96  and  98  may each comprise a non-rotatable roller. 
     In the device in FIG. 15, the cross beam  38  has a horizontal surface  108  and a vertical surface  110 . The vertical surface  110  extends upwardly of the horizontal surface  108 . The shaft  102  extends parallel to the vertical surface  110  and includes a sleeve  112  fitted onto the outer surface thereof. The sleeve  112  has a portion disposed slightly upwardly of the horizontal surface  108 . Accordingly, the outer surface of the supply roll  2  can be engaged with and supported on the vertical surface  110 , the horizontal surface  108  and the portion of the sleeve  112  when the arms  100  are manipulated by an operator and swingingly moved about the shaft  102  in a counterclockwise direction in FIG. 15, in the first place. 
     The shaft  102  includes a lever  114  fixed to and rotated integrally with the one end thereof for activating a switch  116 . The lever  114  cooperates with the switch  116  to detect the residual of the cleaning fabric  6  of the supply roll  2 . 
     In addition, the device further includes preventing means for preventing the arms  100  from reversingly moving to prevent the supply roll  2  from disengaging from the cross beam  38 . The preventing means comprises a rod  118  axially movable to be advanced into and retracted from a path along which one of the arms  100  is swingingly moved. The arm  100  is bought into contact with the rod  118  to retract the rod  118  from the path when the arm  100  is swingingly moved toward the cross beam  38  in accordance with the decrease in diameter of the supply roll  2 , as shown in FIG.  17 . The preventing means further includes resiliently urging means such as a spring for resiliently urging the rod  118  to advance the rod  118  into the path after the arm  100  passes through the rod  118 , as shown in FIG.  18 . The rod  118  then prevents the arm  110  from reversingly moving, as shown in FIG. 19, so that the roller  96  prevents the supply roll  2  from disengaging from the cross beam  38 . 
     The rod  118  can be retracted by knob  122  to reversely move the arm  100 . 
     In other embodiment shown in FIG. 20, the outer surface of the supply roll  2  is engaged with and received by the cross beam  38  mounted on the side frames  36 . The stabilizing means includes a first elongated member  124  opposed to the cross beam  38 , mounted and supported on arms  126  and engaged with the outer surface of the supply roll  2 . The arms  126  include a bar  128  disposed between and mounted on the arms  126 . The bar  128  extends parallel to the cross beam  38 , a passage  130  being formed between the cross beam  38  and the bar  128  so that the cleaning fabric  6  is fed through the passage  130  from the supply roll  2 . The stabilizing means further includes a second elongated member  132  disposed between the first elongated member  124  and the bar  128 . The second elongated member  132  is disposed between and mounted on additional arms  134  which are supported on the bar  128 . The first and second elongated members  124  and  132  comprise rotatable or non-rotatable rollers. 
     The arms  126  are supported at one ends for swingingly movement to move the first elongated member  124  toward the cross beam  38  in accordance with the decrease in diameter of the supply roll  2 . In the embodiment, the arms  126  are supported by and swingingly moved about a support pin  135  and a shaft  136  which are mounted on the side frames  36 , as shown in FIG.  21  and FIG.  22 . The additional arms  134  can be swingingly moved about the bar  128  toward the supply roll  2  so that the second elongated member  132  is engaged with the outer surface of the supply roll  2 . A spring  138  is disposed about the support pin  135  and engaged at opposite ends with the arm  126  and an additional pin  140  which is mounted on the side frame  36 , for resiliently urging the first elongated member  124  toward the cross beam  38 . In addition, springs  142  are disposed about the bar  128  and engaged at one ends with the additional arms  134  for resiliently urging the second elongated member  132  toward the supply roll  2 . 
     The support pin  135  is disposed adjacent to one edge  144  of the cross beam  38 . The bar  128  is positioned on the cross beam side of a plane extending through the first elongated member  124  and the support pin  135  so that the passage  130  decreases in width between the cross beam  38  and the bar  128  in accordance with the decrease in diameter of the supply roll  2 . The passage  130  decreases in width between the cross beam  38  and the bar  128  to be maintained less than the decreasing diameter of the supply roll  2  so that the bar  128  prevents the supply roll  2  from disengaging from the cross beam  38 . 
     The supply roll  2  includes a core  4  about which the cleaning fabric  6  is wound. The core  6  is positioned between a circular arc path along which the first elongated member  124  is moved and a circular arc path along which the second elongated member  132  is moved so that the supply roll  2  is held between the first elongated member  124  and the second elongated member  132 , as shown in FIG.  20 (B). The second elongated member  132  is interposed between the passage  130  and the supply roll  2 . 
     The device further includes detecting means comprising a detecting plate  145  which is fixed to the shaft  136 . A spring  146  resiliently urges the detecting plate  145  toward the supply roll  2  so that the detecting plate  145  is engaged with the outer surface of the supply roll  2 . The shaft  136  is rotated integrally with the detecting plate  145  in accordance with the decrease in diameter of the supply roll  2  so that a switch  148  is activated by the rotation of the shaft  136  for detecting the end of the cleaning fabric  6  from the supply roll  2 . 
     In the device in FIG. 20, the arms  126  are manipulated by an operator so that the outer surface of the supply roll  2  can be engaged with the cross beam  38 , as shown in FIG.  25 . The arms  126  are then swingingly moved about the support pin  135  by the spring  138  so that the first and second elongated members  124  and  132  are engaged with the outer surface of the supply roll  2 , as shown in FIG.  26 . The first and second elongated members  124  and  132  are then moved toward the cross beam  38  in accordance with the decrease in diameter of the supply roll  2 , as shown in FIG.  27  and FIG.  28 . 
     The first elongated member  124  may be shorten than the supply roll  2  and supported at only one end by the arm  126 , as shown in FIG.  29 . The bar  128  may be divided into two parts which are shorten than the supply roll  2  and supported at only one ends by the arms  126  respectively.