JP5116019B2 - Plate changer for sheet-fed printing press - Google Patents

Description

  The present invention relates to a plate changing apparatus for rotating a cam shaft related to plate preparation in a multi-color sheet-fed printing press, and more particularly to a plate changing apparatus related to a configuration of a drive source.

  In the sheet-fed printing press, it is necessary to replace the printing plate mounted on the plate cylinder when printing the next printed matter. By the way, in the recess provided in the plate cylinder, the tail-side cam shaft is rotated, and the plate side is clamped or released by the tail-side upper teeth and the tail-side lower teeth. Rotate the butt side camshaft and hold or release the plate with the butt side upper teeth and butt side lower teeth, and rotate the plate tightening cam shaft to turn the butt side plate. Since the plate tightening portion that moves the tightening portion to the tension side or the loose side is mounted, in conventional replacement of the printing plate, the gripper camshaft and the tail camshaft and the plate tightening cam shaft The releasing operation was performed manually using jig tools. Therefore, it takes a long time to replace the plate and the operating rate cannot be improved. Moreover, since it performed in a narrow place using a tool, there was a danger.

In order to solve this problem, as disclosed in Patent Document 1, the printing plate is automatically pushed into the plate-side plate vise and fastened to the plate cylinder of the plate-side plate clamping unit, The printing body is rotated between the blanket cylinder, the machine body is further rotated, the printing plate is brought into close contact with the plate cylinder and stopped at the lower position of the plate edge, and the printing plate edge is naturally moved to the bottom side by the printing pressure. The plate vise is automatically inserted and stretched, while the plate tension is loosened at a fixed position for removal, and the plate vise on the butt side and the tail side is automatically loosened by the reaction force of the printing plate. Is automatically removed from the plate vise on the butt side, and then the machine body is reversed and stopped at a fixed position for removing the plate so that the plate is removed, the plate is automatically tightened, and the tool is used. A technique for preventing this from happening is disclosed.
JP 2000-272096 A

  In the technology of Patent Document 1, plate clamping can be automated and work efficiency can be improved. However, a motor with a brake for plate clamping and an encoder for detecting a rotational position and a rotational direction are not suitable for pipes and complicated wiring around the plate cylinder. Because it is installed at different positions due to mounting restrictions due to the large number of gears, many gears are required to connect each device and the plate cylinder gear provided on the shaft part of the plate cylinder. Due to the delayed response and the use of a large number of gears, the manufacturing cost increases.

  The present invention has been made in view of these problems, and an object of the present invention is to reduce the number of gears by reducing the number of gears by reducing the number of gears by arranging an encoder and a motor with a brake integrally with a reduction gear. The drive cylinder that transmits the rotation of the motor with brake to the reducer and a clutch on the operation shaft that penetrates the drive cylinder enables contact with and separation from the drive cylinder, and the reference zero point of the plate cylinder In addition to making the encoder unit that always detects the operation possible, the adjustment of the reference zero point also makes it possible to manually rotate the encoder.

  According to the present invention, the prepared camshaft (55) to which the cam follower (41) protruding outside the plate cylinder (50) is attached is rotated by the cam portion (30) provided along with the plate cylinder gear (52). The upper side teeth (56) and the lower side teeth (57) are used to move the plate, and the plate side is clamped or released from the plate side (54), and the plate cylinder (50) protrudes outside. The buttocks camshaft (60) to which the buttocks cam follower (41) is attached is rotated by the cam portion (30) attached to the plate cylinder gear (52) so that the buttocks upper teeth (61) and the buttocks The plate clamping cam shaft (64) is rotated by the bottom plate clamping portion (59) for holding or releasing the printing plate by the lower teeth (62) and the cam portion (30) provided in the plate cylinder gear (52). A plate fastening portion (65) for moving the bottom side plate fastening portion (59) to the tension side or the loose side is attached to the plate cylinder (52). Sheets that are respectively mounted in the recessed portions (53) that are cut and the plate cylinder gear (52) is rotated through the gears by a drive system that includes the motor (4) with brake and the speed reducer (2). In the plate changer for a printing press, a cylindrical drive cylinder (10) that is rotated by rotation of a motor (4) with a brake is disposed in the speed reducer (2), and the plate cylinder gear (52 ) And an operating shaft (12) provided at one end with a gear interlocking with the driving cylinder (10) through the cylinder to form a double structure, and the clutch (14) is connected to one of the operating shaft (12). A clutch contact plate (11) provided on the drive cylinder is fixed so as to face, and an encoder part (18) for detecting a rotational position and a rotational direction is connected to the other part of the operation shaft (12) to provide a brake. The attached motor (4) and the encoder (3) are provided integrally with the speed reducer (2).

  According to the present invention, the encoder unit and the brake motor are integrally installed in the speed reducer, the encoder unit is connected to the operation shaft that always rotates as the plate cylinder rotates, and the brake motor includes the operation shaft. Since the operating shaft and the drive shaft are connected to and separated from each other by a clutch by connecting to the cylindrical drive shaft that penetrates, the operating shaft and the drive shaft can be made into a double structure to make a compact speed reducer. Except at the time of plate change that requires rotation, only the operating shaft rotates in the same manner as the plate cylinder, and this rotation can always be detected by the encoder unit.

  In addition, a plurality of gears in the drive system can be omitted, so that the installation restriction can be solved, and the operation time for adjustment can be shortened to reduce the manufacturing cost. In addition, the reference zero point can be easily adjusted by rotating the encoder manually, and fine adjustment is possible.

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

FIG. 1 is a sectional view of a structure in which a reduction gear according to the present invention, a motor with a brake and an encoder are integrated, FIG. 2 is a sectional view of the reduction gear and a motor with a brake, and FIG. FIG. 4 is a view showing the relationship between the plate changer and the drive system, FIG. 5 is a perspective view of a cam portion attached to the plate cylinder gear, and FIG. 6 is a cross-sectional view of a plate clamping structure provided on the plate cylinder.

  A known camshaft 55 with a part 55a cut out as shown in FIG. 6 is rotated in a recess 53 provided in the axial direction on a part of the outer periphery of the plate cylinder 50 on which the printing plate is mounted. Then, the tail-side plate fastening portion 54 for gripping or releasing the printing plate by the tail-side upper teeth 56 and the tail-side lower teeth 57 and the buttocks-side camshaft 60 with a part 60a cut away are rotated. Then, the bottom side plate fastening portion 59 for holding or releasing the printing plate with the bottom side upper teeth 61 and the bottom side lower teeth 62 and the plate fastening cam shaft 64 with a part 64a cut off are rotated to turn the bottom side plate. A plate fastening portion 65 that moves the fastening portion 59 to the tension side or the loose side is mounted.

  The gripping-side plate fastening portion 54 that holds one end of the printing plate is provided with a gripping-side upper tooth 56 and a gripping-side lower tooth 57, and a spring 58 is contracted between them, A side cam shaft 55 is inserted.

  Further, the bottom side plate fastening portion 59 for holding the other end of the printing plate is provided with a bottom side upper tooth 61 and a bottom side lower tooth 62, and a spring 63 is contracted therebetween, and the bottom side A cam shaft 60 is inserted.

  A plate-clamping cam shaft 64 partially cut out in the flange-shaped groove 50a cut in the axial direction on the side wall in the recess 53 of the plate cylinder 50 is provided between the side surfaces of the bottom side lower teeth 62, and A spring 66 is contracted between the lower teeth 57 on the tail side and the lower teeth 62 on the buttocks side.

  As shown in FIG. 4, at the leading ends of the tail-side cam shaft 55 and the tail-side cam shaft 60, the plate cylinder is located inside the plate cylinder gear 52 rotatably attached to the shaft portion 51 of the plate cylinder 50. A tail-side cam follower 40 and a butt-side cam follower 41 protruding from the side surface of 50 are attached.

  Furthermore, a switching mechanism CH having one end fixed to the side surface of the plate cylinder 50 and the other end having stopper teeth that can be freely engaged with and disengaged from the teeth of the plate cylinder gear 52 is provided on the side surface of the plate cylinder 50. By engaging or disengaging the stopper teeth by the switching mechanism CH, the plate cylinder gear 52 and the plate cylinder 50 can be rotated with respect to each other or can be rotated together as necessary.

  5 is fixed to a part of the plate cylinder gear 52 on the plate cylinder 50 side. On the surface of the cam portion 30, a loosely corrugated or substantially S-shaped groove 31 having both ends opened is defined and divided into a right island 32 and a left island 33 in the drawing.

  The width of the groove 31 is such that the tail-side cam follower 40 and the tail-side cam follower 41 can pass through. The cam followers 40 and 41 are rotated by friction between the wall surface of the groove 31 and the cam followers 40 and 41. 34, the notch of the tail cam cam follower 40, the tail cam shaft 55 connected to the tail cam follower 41, and the tail cam shaft 60 become horizontal, and the upper teeth 56, 61 and the lower teeth 57, respectively, 62 is opened to put the printing plate, and the notch is rotated by the corrugated valley 35 to close the upper teeth 56 and 61 and the lower teeth 57 and 62 so that the printing plate can be received. .

  The drive transmission gear 37 meshed with the plate cylinder gear 51 is connected to a connection gear 39 supported by a bearing 38 installed on the frame 36 shown in FIG. 4, and this connection gear 39 is connected to a drive system described later. The operating shaft 12 is engaged with the gear 13.

  The drive source 1 includes a speed reducer 2 including an operation shaft 12 with a fixed gear 13, an encoder 3 connected to a casing of the speed reducer 2, and a motor 4 with a brake. The drive source 1 is integrated around the speed reducer 2. It is composed by combining.

  The casing 2a of the speed reducer 2 shown in FIG. 1 includes a gear group composed of a plurality of gears and two shafts. That is, a drive gear 6 is attached to the tip of the motor shaft 5 of the motor 4 with brake, an intermediate gear 8 that is pivotally supported by the flat gear 7 via a flat gear 7 that meshes with the drive gear 6, and this intermediate gear. A drive cylinder 10 having a worm gear 9 that meshes perpendicularly to the gear 8 is provided on the circumference.

  The drive cylinder 10 has a cylindrical shape having an opening in the axial direction, and a gear-like clutch contact plate 11 having a hole in the center is fixed to one end portion of the output side of the drive cylinder 10 with a bolt or the like. .

A cylindrical operation shaft 12 is provided in the central opening of the drive shaft 10 so as to pass through the drive shaft 10 with a space. A gear 13 meshing with the communication gear is fixed on one output side of the operation shaft 12, and the surface of the reduction shaft 2 in the vicinity of the gear 13 faces the clutch contact plate 11 of the drive cylinder 10. A gear-like clutch 14 is fixed.

  A gear 15 is provided on the other side of the operation shaft 12, and this gear 15 meshes with a gear 17 provided on the encoder shaft 16.

  That is, the operation shaft 12 and the drive cylinder 10 are arranged in a double state in the speed reducer 2, and only the operation shaft 12 always rotates to transmit the rotation of the plate cylinder 50 to the encoder unit 18, and the phase Is detected.

  With this configuration, when the clutch 14 of the operating shaft 12 is turned on, the rotational force of the motor 4 with brake rotates the drive cylinder 10 via the plurality of gears 6 to 9 and contacts the clutch contact plate 11 of the drive cylinder 10. Is transmitted to the operation shaft 12 through the clutch 14. Further, when the clutch 14 is turned off, even if the operation shaft 12 continues to rotate, the operating force of the motor 4 with brake 4 is cut off by making it non-contact with the clutch contact plate 11 of the drive cylinder 10.

  The encoder unit 18 that is rotatably connected to the speed reducer 2 is fixed to an encoder mounting plate 19 and is protected by a cylindrical case 20 having a bottomed cylindrical shape. The inside of the open end of the cylindrical case 20 and the outer peripheral surface of the encoder mounting plate 19 are in close contact via a seal packing. Therefore, when the cylindrical case 20 is rotated, the encoder mounting plate 19 and the encoder shaft 16 can be rotated together.

  Further, as shown in FIG. 3, the encoder 3 is fastened to the speed reducer 2 by an arc-shaped fixing bracket 22 having a flange portion 21 having the same circumference as the cylindrical case 20 formed inside.

  That is, the flange portion 21 of the fixing bracket 22 is inserted into a groove 20 a cut on the outer periphery of the cylindrical case 20, and is fastened with screws 223 to holes (two places in the figure) drilled in the fixing plate 22. A signal cord for sending a signal from the encoder unit 18 to a display unit (not shown) is attached to the cylindrical case 20.

  The operation of the plate changing apparatus for a sheet-fed printing press having the above configuration will be described.

  In order to attach the front end of the printing plate of the plate cylinder 50 to the plate changer, the tail-side upper teeth 56 and the butt-side upper teeth 61 are opened, and the butt-side plate clamping portion 59 is the plate tension cam of the recess 53 of the plate cylinder 50. Move toward the shaft 64 side. At this time, the teeth of the switching mechanism CH are engaged with the plate cylinder gear 52 of the shaft portion 51 of the plate cylinder 50.

  One end of the printing plate is inserted between the leading side upper teeth 56 and the leading side lower teeth 57, and the meshing between the teeth of the switching mechanism CH and the plate cylinder gear 52 of the plate cylinder 50 is released. By this release, the plate cylinder 50 and the plate cylinder gear 52 are not integrated, and the plate cylinder gear 52 can freely rotate.

  When the clutch 14 of the speed reducer 2 is turned on and the motor 4 with brake is turned on, the rotation of the motor 4 with brake is caused by the drive gear 6 and the flat gear 7 at the tip of the motor shaft 5 in the speed reducer 2 and this. The drive cylinder 10 is rotated via a worm gear 9 that meshes perpendicularly with the intermediate gear 8 that is pivotally supported by the flat gear 7, the operation shaft 12 is rotated by the contact of the clutch contact plate 11 and the clutch 14, and the connecting gear 39. Then, the plate cylinder gear 52 is rotated counterclockwise via the drive transmission gear 37.

  Then, the cam portion 30 fixed to the plate cylinder gear 52 also rotates counterclockwise (when the cam portion is viewed from the right side in FIG. 4), and the tail-side cam follower 40 of the wave groove 31 of the cam portion 30 is rotated. It enters into the groove 31 from the position of the crest 34, opens the tail-side upper teeth 56 and inserts the printing plate.

  Further, the cam portion 30 continues to rotate, and the tail cam follower 40 moves through the corrugated groove 31 of the cam portion 30 and comes out of the groove valley portion 35 position. When the leading-side cam follower 40 passes through the valley portion 35 of the groove 31, the leading-side upper teeth 56 are closed and one end of the printing plate is tightened, and the mounting of the printing plate to the leading-side plate clamping portion 54 is completed.

  The encoder unit 18 connected to the operation shaft 12 is activated to stop the motor 4 with brake to turn off the clutch 14, the contact between the clutch contact plate 11 and the clutch 14 is released, and the rotation of the drive shaft 10 is stopped. The teeth of the switching mechanism CH are meshed with the plate cylinder gear 52 so that the shaft 51 of the plate cylinder 50 and the plate cylinder gear 52 are integrated, and the plate is rotated counterclockwise while being in close contact with the surface of the plate cylinder 50, The plate clamping portion 59 is stopped at a position where it is easy to attach the printing plate, and the end of the printing plate is inserted between the butt side upper teeth 61 and the butt side lower teeth 62.

  Next, the meshing state of the teeth of the switching mechanism CH and the plate cylinder gear 52 is released, so that the plate cylinder gear 52 can freely rotate. The clutch 14 and the motor 4 with brake are turned on, and the rotation of the motor 4 is transmitted to the coupling gear 39 and the drive transmission gear 37 via the drive cylinder 10 and the operation shaft 12, and the plate cylinder gear 52 is rotated counterclockwise. Move.

  When the bottom cam follower 41 enters from the position of the peak portion 34 of the corrugated groove 31 from the inlet of the corrugated groove 31 of the cam portion 30 and reaches the position of the valley portion 35 in the groove 31, the bottom cam shaft 60 is rotated to The side upper teeth 61 are closed and the other end of the printing plate is tightened, and the printing plate is attached to the butt side plate tightening portion 59.

  Thereafter, the plate clamping cam shaft 64 is rotated by appropriate means (not shown), the bottom lower teeth 62 are moved in the recesses 53 of the plate cylinder 50, the plate is stretched, and the printing plate is strongly wound around the plate cylinder 50.

  When the deviation of the rotational position detection by the encoder unit 18 is displayed with respect to the set value by the digital counter meter of the display unit (not shown), as shown in the adjustment procedure shown in FIGS. The screw 23 of the fixing bracket 22 that has been in pressure contact is loosened, and the flange portion 21 of the fixing bracket 22 is separated from the cylindrical case 20.

  Then, since the cylindrical case 20 that has been fixed to the speed reducer 2 until now can be manually rotated, while looking at the display unit, either the left or right side is set so that the reference counter zero point at which the value of the digital counter meter becomes zero. Slightly turn to a new reference zero point. Then, the fixing bracket 22 is tightened with the screw 23 to be integrated with the speed reducer 2.

  To remove the printing plate after starting printing, the reverse operation is performed.

1 is a structural cross-sectional view showing an embodiment of a plate changing apparatus for a sheet-fed printing press according to the present invention, in which a speed reducer, a motor with a brake, and an encoder are integrated. Sectional drawing of a reduction gear and a motor with a brake. External view of the encoder cylindrical case and brake motor. FIG. 5 is a diagram illustrating the relationship between a plate changer and a drive system. The perspective view of the cam part attached to the plate cylinder gear. Sectional drawing of the plate clamping structure provided in the plate cylinder. The state figure which loosens the screw of the fixing bracket. The state figure which is rotating the cylindrical case. The state figure which fixed the fixture.

Explanation of symbols

2 ... Reducer 3 ... Encoder 4 ... Motor with brake 10 ... Drive cylinder 11 ... Clutch contact plate 12 ... Operating shaft 14 ... Clutch 18 ... Encoder unit 20 ··· Cylinder case 22 ··· Fixing bracket 30 ··· Cam portion 31 ··· Groove 40 ··· Edge side cam follower 41 ··· Side cam follower 50 ··· Plate cylinder 52 ··· Plate cylinder gear 54 ... Wear side tightening portion 55 ... Wear side cam shaft 59 ... Bottom side tightening portion 60 ... Bottom side cam shaft

Claims (1)

The tail-side cam shaft (55) to which the cam follower (41) protruding outside the plate cylinder (50) is attached is rotated by the cam portion (30) provided along with the plate cylinder gear (52), so that A tail-side plate fastening portion (54) for gripping or releasing the printing plate by the side upper teeth (56) and the tail-side lower teeth (57), and a butt side cam follower (41) protruding outside the plate cylinder (50) Is rotated by a cam portion (30) provided alongside the plate cylinder gear (52), and is rotated by the upper upper teeth (61) and the lower lower teeth (62). The bottom side plate tightening portion (59) for holding or releasing the printing plate and the cam portion (30) provided alongside the plate cylinder gear (52) rotate the plate tightening cam shaft (64) to tighten the bottom side plate tightening. A plate fastening portion (65) for moving the portion (59) to the tension side or the loose side, and a concave portion ( 3) Renewal of a sheet-fed printing press that is mounted in each of the plates and rotates the plate cylinder gear (52) via a gear by a drive system composed of a motor (4) with brake and a speed reducer (2). In the apparatus, a cylindrical drive cylinder (10) that is rotated by rotation of a motor (4) with a brake is disposed in the speed reducer (2), and a gear that interlocks with the plate cylinder gear (52). An operating shaft (12) provided at one end is passed through the cylinder of the driving cylinder (10) to form a double structure, and a clutch (14) is provided on the driving cylinder on one of the operating shaft (12). A motor with brake (4) is fixed by facing the clutch contact plate (11), and an encoder part (18) for detecting the rotational position and the rotational direction is connected to the other part of the operating shaft (12). And encoder (3) are integrally provided in the speed reducer (2). Of the plate changing apparatus.

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