JP2009073630A - Sheet conveying device and printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce noise by restricting vibration in the case of circulating an endless chain. <P>SOLUTION: In a chain gripper 12 provided with a holding mechanism for holding and releasing a sheet, an endless chain 121 supporting the holding mechanism and a chain guide 123 for guiding the endless chain 121 in a predetermined circulation track, the chain guide 123 comprises a groove 124 formed to be recessed in a fixed frame F so as to form a circulation track, an inside guide member 125a fitted to the frame F in a state of housing a part of the endless chain 121 in the groove 124 so as to support the inside of the endless chain 121 in the circulation track, and an outside guide member 125b fitted to the frame F in a state of housing a part of the endless chain in the groove 124 so as to support the outside of the endless chain 121 in the circulation track. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to, for example, a sheet conveying apparatus that conveys a sheet, and a printing machine using the sheet conveying apparatus.

  For example, in a sheet-fed printing machine that prints on sheets such as film, art paper, and coated paper in addition to normal use paper, a paper feeding unit that feeds and feeds printing sheets one by one; A printing unit that performs printing on the conveyed sheet and a paper discharge unit that discharges the printed sheet are provided. In the sheet discharge unit of the sheet-fed printing press, in order to convey the sheet, both ends of the clamping mechanism for clamping the sheet are attached to endless endless chains arranged opposite to the left and right, and the endless chains are circulated in synchronization. In this way, the sheet conveying device is provided that moves the clamping mechanism along the endless track of the endless chain. Such a sheet conveying apparatus is provided with a chain guide for guiding the endless chain along a predetermined circulation path for conveying the sheet.

  A chain guide in a conventional sheet conveying apparatus is configured such that a fixing bracket that forms a recess is fixed to the left and right frames of the paper discharge unit, and a guide member is attached above and below the opening of the recess of the fixing bracket. An endless chain accommodates one side in a recess and is sandwiched and supported by upper and lower guide members (see, for example, Patent Document 1).

JP-A-11-199085

  However, the chain guide in the above-described conventional sheet conveying apparatus is provided with a fixing bracket projecting from the frame so as to form a recess that accommodates one side of the endless chain, and is supported by sandwiching the endless chain between the fixing bracket. A guide member is attached. For this reason, when the endless chain is circulated along the chain guide, noise is generated because the fixing bracket amplifies the vibration generated in the endless chain.

  The present invention has been made in view of the above, and an object of the present invention is to provide a sheet conveying apparatus and a printing press that can suppress vibration and reduce noise when an endless chain is circulated.

  In order to achieve the above object, in the sheet conveying apparatus according to the first aspect of the present invention, a clamping mechanism that clamps or releases a sheet, an endless endless chain that supports the clamping mechanism, and a predetermined circulation of the endless chain. In the sheet conveying apparatus provided with a chain guide guided by a track, the chain guide is recessed in a fixed frame to form the circulation track, and a state in which a part of the endless chain is accommodated in the groove. An inner guide member attached to the frame and supporting the inside of the circulation track in the endless chain, and the circulation track in the endless chain attached to the frame in a state in which a part of the endless chain is accommodated in the groove. And an outer guide member that supports the outer side of the outer side.

  The sheet conveying apparatus according to claim 2 further includes a sprocket that engages with the endless chain and circulates and drives the endless chain, and the sprocket teeth and the inner guide member end overlap each other in a non-contact manner. A thickness for engaging the endless chain of the overlapped portion by overlapping the notches, and providing an end portion of the inner guide member and a tooth portion of the sprocket in the overlapped portion. The inner guide member has the same thickness as that engaged with the endless chain.

  In the sheet conveying apparatus according to a third aspect of the invention, the inner guide member and the outer guide member are provided so as to be movable with respect to the frame so as to expand and contract the circulation track, and a fixed portion fixed to the frame. A moving portion, and an overlapping portion where the end portion of the fixed portion and the end portion of the moving portion overlap is provided, and the end portion of the fixed portion and the end portion of the moving portion are mutually connected in the overlapping portion. A notch is provided, and a thickness of the overlapped portion that engages with the endless chain, a thickness of the moving portion that engages with the endless chain, and a thickness of the fixed portion that engages with the endless chain. It is characterized by aligning.

  In order to achieve the above-described object, in the printing machine according to the fourth aspect of the present invention, a sheet feeding unit that feeds out sheets one by one, and printing that performs printing on the sheet fed from the sheet feeding unit. A sheet conveying device according to any one of claims 1 to 3, wherein the sheet conveying device according to any one of claims 1 to 3 is configured to include the sheet discharging device that discharges the sheet printed by the printing unit. It is characterized by being applied to the part.

  According to the sheet conveying apparatus of the first aspect of the invention, the endless chain is supported by the frame by the inner guide member and the outer guide member that are directly attached to the frame side, so that the vibration when the endless chain is circulated is rigid. Noise can be reduced by being suppressed by the structure.

  According to the sheet conveying apparatus of the second aspect of the present invention, the contact between the inner guide member and the sprocket is prevented, and the thickness of engaging the endless chain of the overlapped portion by overlapping the notches, and the inner guide member By arranging the thickness to engage with the endless chain, the endless chain can be smoothly transferred between the inner guide member and the sprocket.

  According to the sheet conveying apparatus of the third aspect of the invention, the total length of the circulation track of the endless chain is changed by moving the moving unit, so that the tension of the endless chain supported by the inner guide member and the outer guide member is adjusted. it can. Moreover, due to the overlapping of the notches of the fixed part and the moving part, the thickness of the overlapping part engaged with the endless chain, the thickness of the moving part engaged with the endless chain, and the fixed part engaged with the endless chain. By aligning the thickness, the endless chain can be circulated smoothly at the portion where the tension of the endless chain is adjusted.

  According to the printing machine of the fourth aspect of the present invention, the endless chain is supported by the frame by the inner guide member and the outer guide member that are directly attached to the frame side. Therefore, the vibration when the endless chain is circulated is a rigid structure. Therefore, noise in the paper discharge unit can be reduced. In addition, according to this printing machine, the contact between the inner guide member and the sprocket is prevented, and the thickness of engaging the endless chain of the overlapped portion by overlapping the notches and the endless chain of the inner guide member are related. By aligning the matching thickness, the endless chain can be smoothly transferred between the inner guide member and the sprocket, and the paper discharge operation at the paper discharge unit can be performed smoothly. Further, according to this printing machine, the tension of the endless chain supported by the inner guide member and the outer guide member can be adjusted by moving the moving unit. Moreover, due to the overlapping of the notches of the fixed part and the moving part, the thickness of the overlapping part engaged with the endless chain, the thickness of the moving part engaged with the endless chain, and the fixed part engaged with the endless chain. By aligning the thickness, the endless chain can be circulated and moved smoothly at the portion where the tension of the endless chain is adjusted, and the paper discharge operation at the paper discharge unit can be performed more smoothly.

  Hereinafter, embodiments of a sheet conveying apparatus and a printing press according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  1 is a schematic schematic configuration diagram of a printing press according to an embodiment of the present invention, FIG. 2 is a schematic perspective view of a sheet conveying apparatus according to an embodiment of the present invention, and FIG. 3 is a sheet conveying shown in FIG. FIG. 4 is a sectional view taken along line AA in FIG. 3, FIG. 5 is a sectional view taken along line BB in FIG. 3, FIG. 6 is a sectional view taken along line CC in FIG. These are DD sectional drawings in FIG.

[Printer]
As shown in FIG. 1, a printing machine according to an embodiment of the present invention is a sheet-fed printing machine 1 that performs printing on a sheet P such as a film, art paper, and coated paper in addition to paper for normal use. 8 is a so-called offset sheet-fed printing press including a blanket cylinder 9 and an impression cylinder 10.

  The sheet-fed printing machine 1 includes a paper feeding unit 2 that feeds out and feeds printing sheets P one by one, a printing unit 3 that performs printing on the sheet P conveyed along the traveling direction R, and printing. The paper discharge unit 4 for discharging the sheet P is provided.

  The paper feed unit 2 includes a paper feed tray 5 and a paper feed mechanism 6. The sheet feed table 5 is a table on which the sheets P are stacked. The paper feed mechanism 6 picks up and supplies the sheets P stacked on the paper feed tray 5 one by one in order from the top, and is provided with a separator (paper suction), a cam, a swing gripper, etc. that are not explicitly shown in the figure. It is configured. The sheet feeding stand 5 is controlled so as to move upward in the vertical direction corresponding to the supply of the sheet P so that the sheet feeding mechanism 6 maintains a substantially constant positional relationship with the sheet P.

  The printing unit 3 includes a plurality of printing units 7 that print different colors to realize color printing. A plurality of printing units 7 are provided along the traveling direction R of the sheet P for each color to be printed. In the sheet-fed printing press 1, for example, four printing units 7 corresponding to four different colors such as C (cyan), M (magenta), Y (yellow), and BL (black) are provided side by side. Yes.

  Each printing unit 7 includes a plate cylinder 8, a blanket cylinder 9, and an impression cylinder 10. The plate cylinder 8, the blanket cylinder 9 and the impression cylinder 10 are formed in a cylindrical shape, and each center axis is horizontal and provided so as to intersect the traveling direction R. The plate cylinder 8, the blanket cylinder 9 and the impression cylinder 10 are arranged in this order from the upper side to the lower side in the vertical direction, and the outer peripheral surfaces of the plate cylinder 8 and the blanket cylinder 9 are in contact with each other. The outer peripheral surface of the body 10 is provided so as to be in contact with each other. The plate cylinder 8, the blanket cylinder 9, and the impression cylinder 10 are provided so as to be rotatable about their respective central axes.

  The plate cylinder 8 is provided with a printing plate for forming a printed image on its peripheral surface. In each printing unit 7, an ink supply device (not shown) composed of a roller group for supplying ink to the image line portion of the printing plate, and water for supplying dampening water to the non-image line portion of the printing plate. A dampening device (not shown) comprising a group of rollers is provided around the plate cylinder 8. A blanket made of an elastic material is attached to the peripheral surface of the blanket cylinder 9. The ink supplied to the image line portion of the plate cylinder 8 is transferred to the blanket. The blanket cylinder 9 transfers ink to the sheet P using the printing image of the printing plate as a pattern. The impression cylinder 10 applies a predetermined printing pressure to the sheet P in cooperation with the blanket cylinder 9. The impression cylinder 10 is a so-called double cylinder having a diameter twice that of the plate cylinder 8 and the blanket cylinder 9, and a clamping mechanism (not shown) that holds the leading end of the sheet P around the pressure cylinder 10 is a pressure cylinder. It is provided at two locations on the circumferential surface at substantially symmetrical positions with respect to the central axis of the barrel 10.

  Each printing unit 7 further includes an intermediate cylinder 11. The intermediate cylinder 11 is formed in a cylindrical shape like the plate cylinder 8, the blanket cylinder 9 and the impression cylinder 10, and its central axis is horizontal and intersects with the traveling direction R, and its central axis is It is rotatably provided as a center. The intermediate cylinder 11 is arranged on the upstream side of the impression cylinder 10 with respect to the traveling direction R of the sheet P, and is provided so as to be in contact with the outer peripheral surface of the impression cylinder 10. Similarly to the impression cylinder 10, the intermediate cylinder 11 is a double cylinder having a diameter twice that of the plate cylinder 8 and the blanket cylinder 9, and a clamping mechanism (not shown) that holds the front end of the sheet P around it. Are provided at two locations on the circumferential surface at substantially symmetrical positions with respect to the central axis of the intermediate cylinder 11.

  In each printing unit 7, the intermediate cylinder 11 is arranged so as to be in contact with the impression cylinder 10 of the printing unit 7 adjacent to the upstream side in the traveling direction R of the sheet P. In this embodiment, as shown in FIG. 1, only the printing unit 7 located on the most upstream side in the traveling direction R does not have the double cylinder size intermediate cylinder 11 on the upstream side of paper conveyance. The structure in which the impression cylinder 10 conveys the paper from the paper feeding unit 2 through a single cylinder type intermediate cylinder is adopted. The sheet P supplied from the paper supply unit 2 is first supplied between the blanket cylinder 9 and the impression cylinder 10 of the printing unit 7 located on the most upstream side, and then the downstream printing unit 7. By being replaced by the respective clamping mechanisms from the intermediate cylinder 11 to the impression cylinder 10, it is conveyed through each printing unit 7, and ink is transferred one after another on the way. The type and arrangement of the impression cylinder 10 and the intermediate cylinder 11 are not limited to this, and can be appropriately changed according to the required transport path design.

  The paper discharge unit 4 conveys and stacks the sheets P printed by the printing unit 3 in an aligned state. The paper discharge unit 4 includes a chain gripper 12 that conveys the sheet P, a paper discharge tray 13 on which the printed sheets P are stacked, a fan device 14 that forms a downward airflow in the vicinity of the paper discharge tray 13, and a paper pad 16 And a vacuum suction wheel device 17, a rear paper aligning device 18, and a width direction paper aligning device 19.

  The chain gripper 12 constitutes a sheet conveying apparatus of the present invention that receives the sheet P from the impression cylinder 10 of the most downstream printing unit 7 and conveys the sheet P to a predetermined position above the sheet discharge table 13. The chain gripper 12 has an endless chain 121 facing the endless chain 121 that moves in a circulation path between a position adjacent to the impression cylinder 10 of the most downstream printing unit 7 and an upper position of the paper discharge tray 13. A gripper (clamping mechanism) 122 having a claw portion 122b (see FIG. 2) for clamping and releasing the sheet P is supported between the holding rod 122a (see FIG. 2) and the gripping bar 122a.

  The paper discharge table 13 is suspended from a chain and configured to be movable in the vertical direction. The sheet discharge tray 13 stacks and places the sheets P discharged from the chain gripper 12. When the top surface height of the uppermost stage rises as the sheets P are stacked, the discharge table 13 is continuously or stepwise vertically so that the falling distance of the sheets P becomes substantially constant. It is controlled to move downward in the direction.

  The fan device 14 has a plurality of fans arranged in a substantially rectangular shape, and moves the sheet P discharged from the chain gripper 12 above the discharge table 13 downward in the vertical direction by airflow control. The vacuum suction wheel device 17 decreases the traveling speed when the sheet P is dropped and controls the dropping posture. The vacuum suction wheel device 17 brakes the sheet P by applying a suction force to the upstream (rear) end in the traveling direction R of the sheet P.

  The paper pad 16, the rear paper aligning device 18, and the width direction paper aligning device 19 are provided below the chain gripper 12 and above the paper discharge table 13, that is, between the chain gripper 12 and the paper discharge table 13. . The paper pad 16 regulates the downstream (front) position in the traveling direction R of the sheet P, and a plurality of the paper pads 16 are provided along the width direction of the sheet P. The rear paper aligning device 18 regulates the upstream (rear) position in the traveling direction R of the sheet P, and is composed of a plurality of plate-like members extending in the vertical direction, and is attached to the vacuum suction wheel device 17 respectively. It is done. The width direction paper aligning device 19 aligns the position of the sheet P in the width direction.

  In the sheet-fed printing press 1 having the above-described configuration, the sheets P stacked on the paper feed tray 5 of the paper feed unit 2 are picked up one by one from the uppermost portion by the paper feed mechanism 6 and are transferred to the printing unit 7 of the print unit 3. Supplied. The sheet P supplied to the printing unit 7 is sequentially transferred by the clamping mechanism of the impression cylinder 10 and the intermediate cylinder 11 of each printing unit 7, and is conveyed through each printing unit 7. Transcribed. In each printing unit 7, water is supplied from a dampening device to a non-image area of the printing plate attached to the peripheral surface of the plate cylinder 8, and then ink is supplied from an ink supply device to the image area of the printing plate. . The printed image on the printing plate thus obtained is transferred to the blanket cylinder 9. The printed image transferred to the blanket cylinder 9 is transferred to the sheet P conveyed by the impression cylinder 10 and printing of one color is performed. This is repeated in each printing unit 7 for color printing. The color-printed sheet P is replaced by the gripper 122 of the chain gripper 12 from the impression cylinder 10 of the last (most downstream side) printing unit 7. The sheet P conveyed by the chain gripper 12 is removed from the upper side of the paper discharge tray 13 and dropped, and is stacked on the paper discharge tray 13. At this time, in order to prevent undried ink from appearing on the back of the upper sheet P, powder is sprayed on the sheet P in advance when it is conveyed by the chain gripper 12. Further, the sheets P stacked on the paper discharge tray 13 are aligned by the fan device 14, the vacuum suction wheel device 17, the paper pad 16, the rear paper alignment device 18, and the width direction paper alignment device 19 on the paper discharge tray 13. Laminated.

[Sheet Conveying Device]
The sheet conveying apparatus is configured as the chain gripper 12 of the paper discharge unit 4 described above. The sheet conveying apparatus includes a chain guide 123 as shown in FIGS. The chain guide 123 forms a circulation track of the endless chain 121 shown in FIG. 1 and is arranged to face each other so as to guide the opposed endless chains 121. The chain guide 123, the inner guide member 125a, And an outer guide member 125b.

  The groove part 124 is recessed with respect to the opposing surface of the fixed flame | frame F (refer FIG. 4) opposingly arranged so that the circulation track | orbit of the endless chain 121 may be followed, as shown in FIG. The groove portion 124 has an opening and a groove depth that can accommodate one side portion of the endless chain 121.

  The inner guide member 125a is formed in a plate shape as shown in FIG. 3, and extends along the inside of the circulation track in the endless chain 121 and partially covers the inside of the circulation track of the opening in the groove portion 124 as shown in FIG. It is attached to the frame F with bolts or the like. The outer guide member 125b is formed in a plate shape as shown in FIG. 3, and extends along the outside of the circulation track in the endless chain 121, and partially covers the inside of the circulation track of the opening in the groove portion 124 as shown in FIG. It is attached to the frame F with bolts or the like. The inner guide member 125 a and the outer guide member 125 b are provided with a gap at the opening portion of the groove portion 124. The roller 121c of the endless chain 121 is fitted into the gap between the inner guide member 125a and the outer guide member 125b. The endless chain 121 fitted in the gap between the inner guide member 125a and the outer guide member 125b is guided along a predetermined circulation track while one side thereof is accommodated in the groove 124 and disposed in the frame F. Is done.

  The inner guide member 125a and the outer guide member 125b are made of SS400 steel, and the surface of the inner guide member 125a and the outer guide member 125b is subjected to tuftride treatment to increase the hardness. In addition, a steel material of S45C may be used for the inner guide member 125a and the outer guide member 125b.

  Further, the roller 121c of the endless chain 121 is provided with a pin 121b for connecting the link 121a of the endless chain 121 and is provided so as to be rotatable about the axis of the pin 121b. Tooth portion 126a of a sprocket 126 (see FIGS. 2 and 3) that circulates and drives the endless chain 121 in the first turn-up portion W1 (portion replaced by the gripper 122 from the impression cylinder 10 of the most downstream printing unit 7). To be fitted.

  In addition, the inner guide member 125a receives the endless chain 121 from the tooth portion 126a of the sprocket 126 while delivering the endless chain 121 to the tooth portion 126a of the sprocket 126 in the first turning portion W1 of the circulation track. The inner guide member 125a is cut at the position of the sprocket 126, and is provided continuously along the circulation track in other portions. As shown in FIGS. 3 and 5, one end portion and the other end portion obtained by cutting the inner guide member 125 a and the tooth portion 126 a of the sprocket 126 are provided with overlapping portions. In this overlapping portion, both ends of the inner guide member 125a and the tooth portion 126a of the sprocket 126 are provided with a notch 125c and a notch 126b as shown in FIG. 5, and these notches 125c and 126b are not in contact with each other. The thickness T1 that engages the endless chain 121 of the inner guide member 125a and the thickness T2 that engages the endless chain 121 of the overlapped portion are aligned so as to be continuous.

  The outer guide member 125b is continuously provided endlessly along the circulation track regardless of the position of the sprocket 126. In other words, the outer guide member 125b is arranged in an arc shape along the outer periphery of the tooth portion 126a of the sprocket 126 in the first turning portion W1 of the circulation track.

  Further, the inner guide member 125a and the outer guide member 125b are arranged in a substantially U shape at the second turn-up portion W2 of the circulation track shown in FIG. 3 (the portion where the gripper 122 is removed above the discharge table 13). The U-shaped portion is divided into an inner guide member 125a and an outer guide member 125b of another circulation track. The inner guide member 125a and the outer guide member 125b in the second folded portion W2 of the circulation track have a U-shaped closed portion formed in an arc shape, and the U-shaped open end portion is linear and parallel to each other. Is formed. An elongated hole 125e is provided in the U-shaped open end as shown in FIGS. The elongated hole 125e is provided in parallel with the guide members 125a and 125b along the parallel extending direction of the inner guide member 125a and the outer guide member 125b. The U-shaped open end portion is provided with the linear end portions of the guide members 125a and 125b of the other circulation tracks facing each other, and these end portions are connected to each other.

  Specifically, the end portions of the guide members 125a and 125b of the other circulation tracks form a fixed portion attached to the frame F with pins 127 fixed to the frame F as shown in FIG. On the other hand, the U-shaped open end guide members 125a and 125b are provided with the pin 127 inserted through the elongated hole 125e, and a movable portion supported so as to be movable in the extending direction of the elongated hole 125e. It is made. In addition, the U-shaped open end guide members 125a and 125b and the end portions of the other circulation track guide members 125a and 125b are provided with overlapping portions. In this overlapped portion, a notch 125c is provided at the end of each other, and by overlapping these notches 125c, 125c, the thickness of the overlapped portion engaged with the endless chain 121 and the mutual guide members 125a, 125b The thickness T1 engaging with the endless chain 121 is continuously arranged.

  Furthermore, the U-shaped guide members 125a and 125b in the second folded portion W2 of the circulation track are attached to the slide member 128 as shown in FIGS. The slide member 128 has a groove 124 that constitutes the chain guide 123 together with the U-shaped guide members 125a and 125b in the second folded portion W2 of the circulation track, and extends along the extending direction of the elongated hole 125e. A long hole 128a is provided. The slide member 128 is housed in a recess F1 formed in the frame F, and is attached to the frame F by screws 128b inserted into the elongated holes 128a. The frame F is provided so as to be slidable in the extending direction of the long hole 128a (the direction of arrow S in FIGS. 3 and 6) by loosening the screw 128b. That is, the U-shaped guide members 125a and 125b in the second folded portion W2 of the circulation track are supported by the pins 127 with respect to the guide members 125a and 125b of the other circulation tracks as the slide member 128 slides. However, it slides in the extending direction of the long hole 125e (the direction of the arrow S in FIGS. 3 and 6) so as to expand and contract a part of the circulation track.

  Further, the inner guide member 125a and the outer guide member 125b are formed of a plurality of parts via a seam 125d as shown in FIG. Further, as shown in FIG. 7, the seam 125 d portion is provided with an overlapping portion where the end portions of the inner guide member 125 a and the end portions of the outer guide member 125 b overlap each other. In this overlapped portion, a notch 125c is provided at the end of each other, and by overlapping these notches 125c, 125c, the thickness that engages the endless chain 121 of the overlapped portion and the endlessness of the guide members 125a, 125b. The thickness T1 engaged with the chain 121 is aligned so as to be continuous. The inner guide member 125a and the outer guide member 125b are attached to the frame F by bolts or the like where the notches 125c and 125c overlap each other. With this configuration, the circulation track can be easily manufactured and assembled, the inner guide member 125a and the outer guide member 125b can be securely attached to the frame F, and the endless chain 121 can be overlapped with the joint 125d. Can be guided smoothly.

  In the sheet conveying apparatus (chain gripper 12) applied to the sheet-fed printing press 1 described above, in conveying the sheet P, the sprocket 126 is rotationally driven clockwise in FIG. 3 (in the direction of arrow K in FIG. 3). The endless chain 121 is circulated and moved in the direction of arrow J in FIG. 3 along the circulation path formed by the inner guide member 125a and the outer guide member 125b. The gripper 122 that moves in the circulation track along with the circulation movement of the endless chain 121 passes the lower region of the circulation track by adding the leading end of the sheet P at the first folding portion W1, and the sheet at the second folding portion W2. Remove P's mouth. The gripper 122 with the grip removed passes through the upper region of the circulation track and returns from the second folded portion W2 to the first folded portion W1.

  According to the sheet conveying apparatus configured as described above, the chain guide 123 that supports the endless chain 121 on the circulation track includes the groove portion 124 that is formed on the fixed frame F side along the circulation track, and the groove portion 124 is endless. It is composed of guide members 125 a and 125 b that are attached to the frame F side in a state in which a part of the chain 121 is accommodated and support the inside and outside of the circulation track in the endless chain 121. For this reason, since the endless chain 121 is supported by the frame F by the guide members 125a and 125b directly attached to the frame F side, vibration when the endless chain 121 is circulated is suppressed by the rigid structure to reduce noise. it can. Further, according to the sheet-fed printing press 1 in which this sheet conveying apparatus is applied to the paper discharge unit 4, noise in the paper discharge unit 4 can be reduced.

  Some conventional chain guides for sheet conveying apparatuses employ a guide rail having a substantially C-shaped cross section made of a casting. Since the guide rail made of this casting requires time to accurately process the C-shaped open portion that supports the endless chain, the manufacturing cost of the guide rail is increased, and the centrifugal motion associated with the circulating endless chain is high. There is a possibility that the C-shaped opening end may be fatigued due to a load such as force or vibration. In this respect, the chain guide 123 according to the present embodiment has a configuration in which the guide members 125a and 125b formed in a plate shape are attached to the opening portion of the groove portion 124, so that the manufacturing cost of the guide member is lower than that of the casting. Moreover, since vibration can be suppressed as described above, a situation in which fatigue failure occurs can be reduced. Further, as the material of the guide members 125a and 125b, the strength can be further improved by using a steel material of SS400 that has been subjected to tuftride treatment or a steel material of S45C.

  The inner guide member 125 a that supports the inside of the circulation track of the endless chain 121 is cut at the position of the sprocket 126, and notches 125 c and 126 b are provided in the overlapping portion between the end portion and the tooth portion 126 a of the sprocket 126. Yes, by overlapping these notches 125c and 126b in a non-contact state, a thickness T1 that engages the endless chain 121 of the inner guide member 125a and a thickness T2 that engages the endless chain 121 at the overlapping portion are continuous. Are aligned. For this reason, the contact between the inner guide member 125a and the sprocket 126 can be prevented, and the endless chain 121 can be smoothly transferred between the inner guide member 125a and the sprocket 126. Further, since the outer guide member 125b is disposed in an arc shape along the outer periphery of the tooth portion 126a of the sprocket 126, the engagement between the sprocket 126 and the endless chain 121 at the outer peripheral portion of the sprocket 126 can be maintained. . Further, according to the sheet-fed printing press 1 in which the sheet conveying device is applied to the paper discharge unit 4, the paper discharge operation in the paper discharge unit 4 can be performed smoothly.

  In addition, the guide members 125a and 125b of the chain guide 123 are fixed to the frame F so as to expand and contract a fixed portion fixed to the frame F and a part of the circulation track of the endless chain 121 in the second folded portion W2 of the circulation track. And a moving unit provided so as to be movable. For this reason, since the total length of the circulation track changes by moving the moving part along the extending direction of the long hole 125e, the tension of the endless chain 121 supported by the guide members 125a and 125b can be adjusted. In addition, the fixed portion and the moving portion are provided with notches 125c and 125c in the overlapping portion where the end portions overlap each other, and the notches 125c and 125c are overlapped to engage with the endless chain 121 in the overlapping portion. Since the thickness of the endless chain 121 and the thickness T1 of the guide members 125a and 125b that engage with the endless chain 121 are continuously arranged, the endless chain 121 is circulated and moved at the portion where the tension of the endless chain 121 is adjusted. Can be done smoothly. Further, according to the sheet-fed printing press 1 in which the sheet conveying device is applied to the paper discharge unit 4, the paper discharge operation in the paper discharge unit 4 can be performed more smoothly.

  In the above-described embodiment, the slide member 128 to which the groove portion 124 is recessed and the U-shaped guide members 125a and 125b are attached is applied as a configuration for sliding the moving portion. In addition, although not explicitly shown in the drawing as a configuration for sliding the moving portion, guide members 125a and 125b having a U-shape with respect to the frame F are provided so as to be slidable without using the slide member 128. A groove portion 124 that accommodates one side portion of the endless chain 121 may be provided corresponding to the position where the guide members 125a and 125b slide.

  Incidentally, in the sheet conveying apparatus (chain gripper 12) applied to the above-described sheet-fed printing press 1, the circulation trajectory of the endless chain 121 is the first of the circulation trajectories provided with the sprocket 126 as shown in FIGS. The gripper 122 is removed from the second folding part W2 of the circulation track (the part above the paper discharge tray 13) rather than the folding part W1 (the part where the impression cylinder 10 of the most downstream printing unit 7 is replaced with the gripper 122). Part) is located above.

  Then, in the lower region of the circulation track, the sheet P with the leading end held by the gripper 122 is conveyed toward the upper left in FIG. 3 while being accelerated by the rotational drive of the sprocket 126. In the chain gripper 12 according to the present embodiment, the impression cylinder 10 and the paper discharge tray 13 of the most downstream printing unit 7 are smoothly connected to the second folded portion W2 from the first folded portion W1 in the lower region of the circulation track. In addition, the chain guide 123 (the groove portion 124, the inner guide member 125a, and the outer guide member 125b) is arranged to form an arc portion W3 having the maximum curvature according to the arrangement of the configuration relating to the conveyance of the sheet P.

  For this reason, even if the gripper 122 holding the leading end of the sheet P changes its direction from the first folding part W1 to the second folding part W2 in the upper left direction, the gripper 122 is guided by the circular arc part W3 along a smooth trajectory. Therefore, the free rear end side where the sheet P is not held does not flutter, and the conveying posture of the sheet P can be stabilized. In addition, since the gripper 122 is guided by the arc portion W3 along a smooth trajectory, the centrifugal force applied to the endless chain 121 can be reduced, and the wear resistance between the endless chain 121 and the guide members 125a, 125b can be improved.

  In the upper region of the circulation track, the gripper 122 moves toward the lower right in FIG. 3 while being accelerated by the rotational drive of the sprocket 126. In the chain gripper 12 in the present embodiment, an arc portion W4 is formed in the upper region of the circulation track so as to be smoothly connected from the second folded portion W2 to the first folded portion W1. A guide member 125a and an outer guide member 125b) are arranged. In the circular orbit in the present embodiment, the arc portion W3 is formed with the largest curvature, and then the arc portion W4, the first folded portion W1, and the second folded portion W2 (U-shaped closed portion) in this order. Curvature is set.

  In addition, in the U-shaped lower region of the second folded portion W2, the guide members 125a and 125b are formed so that the open end connected to the arc portion W3 is substantially horizontal. Then, an arcuate portion of the U-shaped closed portion is formed from the open end toward the left in FIG. 3 to form an inclined portion W5 that is inclined to the lower left to form a chain guide 123 (groove 124, inner guide member 125a and An outer guide member 125b) is arranged. The inclination angle θ of the inclined portion W5 is set to be 2 ° or more and 5 ° or less, and preferably 3.5 °.

  For this reason, the gripper 122 holding the leading edge of the sheet P moves in the inclined portion W5 inclined downward to the left, so that the sheet P is in a posture with the leading edge slightly directed to the lower left. As a result, the posture of dropping the sheet P onto the paper discharge tray 13 can be stabilized.

  As described above, the sheet conveying apparatus and the printing press according to the present invention include, for example, an endless endless chain that supports a nipping mechanism for nipping a sheet in order to convey a sheet, and the endless chain in a predetermined circulation path. The present invention is useful for a configuration including a chain guide for guiding, and is particularly suitable for reducing noise by suppressing vibration when the endless chain is circulated.

1 is a schematic schematic configuration diagram of a printing press according to an embodiment of the present invention. 1 is a schematic perspective view of a sheet conveying apparatus according to an embodiment of the present invention. It is the schematic which shows the chain guide of the sheet conveying apparatus shown in FIG. It is AA sectional drawing in FIG. It is BB sectional drawing in FIG. It is CC sectional drawing in FIG. It is DD sectional drawing in FIG.

Explanation of symbols

1 sheet-fed printing machine (printing machine)
2 Feeding unit 3 Printing unit 4 Discharging unit 12 Chain gripper 13 Discharging stand 121 Endless chain 121a Link 121b Pin 121c Roller 122 Gripper 122a Holding rod 122b Claw portion 123 Chain guide 124 Groove portion 125a Inner guide member 125b Outer guide member 125c Notch 125d joint 125e elongated hole 126 sprocket 126a toothed portion 126b notched 127 pin 128 slide member 128a elongated hole 128b screw F frame F1 recessed portion P sheet W1 first folded portion W2 second folded portion W3 arc portion W4 arc portion W5 inclined portion θ inclination angle

Claims (4)

In a sheet conveying apparatus comprising a clamping mechanism for clamping or releasing a sheet, an endless endless chain that supports the clamping mechanism, and a chain guide that guides the endless chain in a predetermined circulation path,
The chain guide is
A groove part recessed in a fixed frame to form the circulation track,
An inner guide member that is attached to the frame in a state in which a part of the endless chain is accommodated in the groove and supports the inside of the circulation track in the endless chain;
An outer guide member attached to the frame in a state where a part of the endless chain is accommodated in the groove portion, and supporting an outside of the circulation track in the endless chain.   A sprocket that engages with the endless chain and circulates and drives the endless chain is provided, and an overlapping portion is provided in which the sprocket teeth and the end of the inner guide member overlap each other in a non-contact manner, The end of the guide member and the tooth portion of the sprocket are provided with a notch, the thickness of the notch overlapping the endless chain and the endless chain of the inner guide member engaging with the endless chain. The sheet conveying apparatus according to claim 1, wherein the thickness is uniform. The inner guide member and the outer guide member constitute a fixed portion fixed to the frame and a moving portion provided to be movable with respect to the frame so as to expand and contract the circulation track,
An overlapping portion where the end portion of the fixed portion and the end portion of the moving portion overlap is provided, and a notch is provided between the end portion of the fixing portion and the end portion of the moving portion in the overlapping portion, and the overlap of the notches The thickness of the overlapping portion engaged with the endless chain, the thickness of the moving portion engaged with the endless chain, and the thickness of the fixed portion engaged with the endless chain are aligned. The sheet conveying apparatus according to claim 1. A sheet feeding unit that feeds out the sheets one by one, a printing unit that prints the sheet fed from the sheet feeding unit, and a discharge unit that discharges the sheet printed by the printing unit. In a printing machine equipped with a paper section,
A printing machine, wherein the sheet conveying device according to any one of claims 1 to 3 is applied to the paper discharge unit.

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