JP4451532B2 - Sheet-like material conveyance device for sheet-fed rotary printing press - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet-like material conveyance device that conveys an end portion of a sheet-like material sent from the upstream side in the conveyance direction of a sheet-like material to a printing cylinder with a swinging nail in a sheet-fed rotary printing press.
[0002]
[Prior art]
In general, this type of paper transport device is such that a sheet is sucked from a paper feed device one by one through a suction port of a sucker device and then transported to a feeder board by rotation of a paper feed roller, and a paper feed tape or the like. Then, it is conveyed on the feeder board toward the difference plate. The leading edge of the sheet fed on the difference plate is aligned at the register, is added to the swing claw, is transported to the cylinder of the printing press by the swing of the swing, and is replaced by the cylinder claw here. .
[0003]
By the way, in this kind of paper conveying apparatus, the phenomenon that the bottom side of the paper is stretched (or shrunk) in the left-right direction due to moisture and great pressure when printing is performed on the paper, and this stretch (or shrinkage) occurs. If this occurs, the print registration on the bottom side of the paper at the time of multi-color printing, which is called “coincidence registration”, deviates and a problem of poor printing occurs. As a solution to this problem, there is one disclosed in JP-A-7-52361.
[0004]
What has been disclosed herein includes a rod that is supported so as to be movable in the axial direction within the swing shaft, a slide member that moves integrally with the rod and is provided with a cam follower, and a cam surface that the cam follower contacts. And a cam plate fixed to the claw base. Then, following the swing of the swing shaft, the rod reciprocates in the axial direction, and the slide member also reciprocates in the axial direction, so that when the paper is held by the nail via the cam follower and the cam plate, the nail base is When the paper is bent in the paper transport direction and replaced by the drum, the claw base returns to a flat shape.
[0005]
[Problems to be solved by the invention]
However, in the above-described sheet-like material conveyance device of the conventional sheet-fed rotary printing press, the cam follower pressed against the cam surface of the cam plate rolls on the cam surface when the rod moves in the axial direction. Thus, the sliding contact with the cam surface does not occur, but the left and right moving ends of the rod make sliding contact with the cam surface. That is, at the left and right moving ends of the rod where the moving direction of the cam follower changes, the cam follower stops because the rod temporarily stops, but the cam follower stops due to the rolling inertia acting on the cam follower. Therefore, the surface of the cam follower is in sliding contact with the cam surface. Also, when the movement is started from the state where the rod is stopped, the cam follower cannot follow the movement of the cam follower and the surface of the cam follower is temporarily in sliding contact with the cam surface. In this case, the length with which the cam follower is in sliding contact reaches a unit of mm since the movement length in the left-right direction of the rod is set to several mm in order to cause the claw base to bend. In addition, in the above-described conventional sheet-like material conveyance device for a sheet-fed rotary printing press, the cam follower is pressed against the cam surface of the cam plate with a large pressure by a line contact, so a load is applied to a portion pressed against the cam surface. Concentrate. In this way, since the load is concentrated on the cam surface and a part of the cam follower, the cam surface of the cam plate is brought into sliding contact with each other, so that the cam surface and a part of the cam follower are easily worn and there is a problem in durability.
[0006]
The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a sheet-like material conveyance device for a sheet-fed rotary printing press with improved durability.
[0007]
[Means for Solving the Problems]
To achieve this object, the invention described in claim 1 includes a shaft rotatably supported between frames, a claw and a claw base supported on the shaft side and holding an end of a sheet-like material, and the claw. A plurality of claw shafts provided in the axial direction of the shaft, and the end of the sheet-like material sent from the upstream side in the conveyance direction of the sheet-like material by rotating the shaft and the claw base is added. In a sheet-like material conveyance device for a sheet-fed rotary printing machine that conveys to a drum, a rod having an eccentric portion that extends in parallel with the shaft and is rotatably supported at both ends, and a drive means for rotating the rod A pressing member that is rotatably inserted into the eccentric portion of the rod and has an engaging portion formed on a part of the outer peripheral portion thereof, and is in surface contact with the engaging portion of the pressing member, and the rotation of the rod Is displaced through the pressing member by moving the claw shaft in the paper conveying direction. Is obtained by providing a Maseru displacement means.
Therefore, when the claw shaft is bent in the paper conveyance direction by the displacement means, the load that presses the engagement portion of the pressing member that is in surface contact with the displacement member is dispersed, and the engagement portion of the pressing member is against the displacement member. Therefore, the wear between the engaging portion of the pressing member and the displacement member is relatively reduced.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a part of a sheet-like material conveyance device of a sheet-fed rotary printing press according to the present invention, FIG. 2 is a side view showing the same general configuration, and FIG. 4 is a sectional view taken along line IV-IV in FIG. 1, and FIG. 5 is a sectional view taken along line VV in FIG. 6 is an enlarged front view of the main part, FIG. 7 is a view taken along the arrow VII in FIG. 6 for explaining the structure of the fixed cam, and FIG. 8 is a view taken along the line VII in FIG. 6 for explaining the structure of the movable cam. FIG. 9 is a view showing the position of the nail when the paper is held and when the paper is replaced. FIG. 10 is a schematic diagram for explaining the amount of displacement of the large-diameter portion of the rod when holding the paper and when holding it. In FIG. 7, for the sake of convenience, illustration of the movable cam is omitted, and illustration of the fixed cam is omitted in FIG.
[0009]
In FIG. 1, a reference numeral 1 denotes a swing which is a paper transport device for a sheet-fed printing machine, and can be freely rotated on the left and right frames 2 and 2 via holders 3a and 3a and bearings 3 and 3. A supported hollow feed cylinder shaft 4 is provided. In FIG. 2, the paper 6 conveyed from the register part of the difference plate 6a to the point a which is the paper holding position of the paper feed cylinder 1a by the lower swing 5 is held by the claw 13 of the claw shaft 11 which will be described later. By the rotation of the cylinder shaft 4, it is conveyed to the position of point b, that is, the position where the paper 6 is replaced by the impression cylinder 7. The feed cylinder shaft 4 is configured to rotate via a gear using a prime mover as a drive source, like the impression cylinder 7.
[0010]
The upper ends of a pair of opposing support levers 8, 8 are fixed to both ends of the sheet feeding cylinder shaft 4, and a claw base bar 9 is fixed between the support levers 8, 8. A plurality of claw bases 10 are fixed so as to be arranged in the axial direction of the paper feed cylinder shaft 4. In addition, a claw shaft 11 is rotatably supported on the lower end portions of the opposing support levers 8 and 8 via a bearing 12 so as to be parallel to the claw base bar 9. A plurality of claws 13 in contact with 10 are provided. One end of a lever 14 is fixed to a protruding end portion of the claw shaft 11 protruding from the right support lever 8, and a roller 15 is pivotally supported on the other end of the lever 14.
[0011]
Reference numeral 16 denotes an all-around cam, and this all-around cam 16 is fixed to the frame 2 via a holder 3a so as to be rotatable with respect to the sheet feeding cylinder shaft 4. The roller 15 described above is always pressed against the entire circumferential cam 16 by the torsional moment of the torsion bar 11a in the claw shaft 11, and is urged to rotate in the direction in which the claw 13 is closed. Therefore, when the paper feed drum shaft 4 rotates and the claw 13 of the claw shaft 11 is positioned at the point a in FIG. 2, the claw 13 comes into contact with the claw base 10 by the torsional moment of the torsion bar 11a and the end of the paper 6 is moved. Mouth. Further, when the claw 13 of the claw shaft 11 is positioned at the point b in FIG. 2, the roller 15 comes into contact with the large diameter portion of the all-around cam 16 and resists the torsional moment of the torsion bar 11a via the lever 14. 11 is rotated, the claw 13 is separated from the claw base 10, and the paper 6 is replaced with the cylinder 7.
[0012]
In FIG. 1, 18 is a rod formed in a rod shape, and a large diameter portion 18a is provided from the center of the rod 18 to the right side in the figure. The rod 18 is parallel to the feed cylinder shaft 4 via a bearing 19 of the left support lever 8 and bearings 21 and 21 of a pair of bearing members 20 and 20 fixed to the feed cylinder shaft 4. And is supported rotatably. A pair of cylindrical pressing members 23 and 23 are rotatably inserted into the large-diameter portion 18a of the rod 18 via bearings 22 and 22, as shown in FIG. A part of the outer peripheral portion is provided with a chamfered portion 23a as an engaging portion formed in a flat shape. The rotation center C2 of the bearing 22 that rotatably supports the pressing member 23 on the rod 18 is positioned so as to be eccentric with respect to the rotation center C1 of the bearings 19 and 21 that rotatably support the rod 18. Yes.
[0013]
Corresponding to the pair of pressing members 23, a pair of pressing levers 25 as displacement means are fitted and inserted into the sheet feeding cylinder shaft 4 via bushes 26 so as to be rotatable. Movement in the axial direction is restricted by the fixed holder 27. As shown in FIG. 4, the lower end portion of the pressing lever 25 is provided with an insertion hole 25a into which the claw shaft 11 is inserted, and the side portion is provided with a protruding portion 25b in which a concave portion 25c is formed. . The above-described claw base bar 9 is fixed to the pressing lever 25 by a bolt 24.
[0014]
A rectangular parallelepiped braking member 28 is fixed to the protrusion 25 b of the pressing lever 25. Reference numeral 29 denotes a bracket fixed to the feed cylinder shaft 4. A set screw 30 is screwed into a screw portion 29 a of the bracket 29, and the flange portion 30 a of the set screw 30 and the press lever 25 described above are engaged. A compression coil spring 31 is mounted between the recess 25c. Accordingly, the pressing lever 25 is urged so as to rotate counterclockwise in the drawing with the sheet feeding cylinder shaft 4 as the rotation center, and the braking member 28 is pressed against the chamfered portion 23 a of the pressing member 23.
[0015]
In FIG. 1, one end of a lever 33 is pivotally attached to the projecting end of the rod 18 protruding from the left support lever 8, and a cam follower 34 is pivotally attached to the swinging end of the lever 33. A cam 35 is constituted by a fixed cam 35a and a movable cam 35b, as will be described later, and a cam follower 34 is in contact with the cam 35. One end of the lever 36 is pivotally attached to a portion of the rod 18 located inside the left support lever 8, and a head 37a of the rod 37 is pivotally attached to the swing end as shown in FIG. ing. The rod 37 is slidably supported in an insertion hole of a stud 38 pivotally attached to the support lever 8, and a compression coil spring 39 wound around the rod 37 is elastic between the stud 38 and the head 37a. It is disguised. Therefore, in FIG. 3, the elastic force of the compression coil spring 39 urges the rod 18 to rotate counterclockwise in the drawing via the lever 36, and the cam follower 34 is cam 35 via the lever 33. Is in pressure contact.
[0016]
6 and 7, reference numeral 40 denotes a fixed cam mounting ring formed in a substantially annular shape, which is provided around the sheet feeding cylinder shaft 4 in the vicinity of the frame 2 and fixed to the holder 3a by a bolt 40a. Yes. A fixed cam 35 a formed in a semicircular ring shape is fixed to the fixed cam mounting ring 40 so as to be provided around the sheet feeding cylinder shaft 4.
[0017]
6 and 8, reference numeral 41 denotes an operation shaft provided with a knob 41 a, which is inserted into an insertion hole of a stud 43 pivotally attached to a pedestal 42 fixed to the frame 2, and is freely rotatable on the stud 43. It is supported. The lower end of the operation shaft 41 is connected to the upper end of the connecting member 44 via a universal joint, and a screw rod 45 is screwed into the hollow thread portion of the connecting member 44, and the lower portion of the screw rod 45 protrudes from the connecting member 44. In this manner, the connecting member 44 is fixed by a double nut.
[0018]
By rotating the knob 41a and rotating the screw rod 45 via the operation shaft 41 and the connecting member 44, the movable cam 35b has the pin 49 as the center of rotation, as shown by a two-dot chain line in the figure. It is comprised so that it can contact / separate from the axis | shaft 4. FIG. That is, the screw rod 45 is screwed into the threaded portion of the stud 46, the stud 46 is pivotally supported at one end of the bracket 47, and one end of the movable cam 35b is fixed to the other end of the bracket 47. The movable cam 35b is formed in a semicircular ring shape, is provided around the feed cylinder shaft 4, and a support lever 48 attached to the other end is pivotally attached to the fixed cam attachment ring 40 via a pin 49. The pin 49 is pivotally supported on the frame 2 side with the center of rotation.
[0019]
The fixed cam 35a and the movable cam 35b are provided around the feed cylinder shaft 4 so as to face each other. The open ends of the cams 35a and 35b (for convenience in FIGS. 7 and 8 are hatched in a lattice shape). The applied portions) are formed so as to be thin with each other, and these portions are positioned so as to overlap each other. This prevents the joint between the cams 35a and 35b. That is, in the paper transport operation described later, when the cam follower 34 rotates while being in contact with each other around the cams 35a and 35b, the cam follower 34 is engaged with the cams 35a and 35b, so that printing is in progress. This is to prevent the machine from failing. As shown in FIG. 6, the support portion 40 b formed to protrude from the above-described fixed cam attachment ring 40 is pivotally attached to the connecting member 44 via a pin 52.
[0020]
Next, a paper transport operation in the sheet-like material transport device of the sheet-fed rotary printing press having such a configuration will be described.
When the feed cylinder shaft 4 is rotated by driving from the prime mover and the swing 1 is rotated from the position b to the position a in FIG. 2, the support lever 8 is also rotated and the claw shaft 11 is also rotated. When the claw shaft 11 is rotated, the roller 15 comes into contact with the small diameter portion of the all-around cam 16 and the claw shaft 11 is rotated by the torsional moment of the torsion bar 11a. With this, the end of the paper 6 is added. At the same time, the rotation of the feed cylinder shaft 4 causes the cam follower 34 to rotate around the feed cylinder shaft 4 and ride on the movable cam 35b as shown in FIG. 8, so that the rod 18 in FIG. 3 rotates clockwise in the figure. Move.
[0021]
When the rod 18 rotates, in FIG. 4, the rotation center C <b> 2 of the pressing member 23 is eccentric with respect to the rotation center C <b> 1 of the rod 18, so that the pressing member 23 moves slightly downward in the drawing via the bearing 22. To do. Therefore, the pressing lever 25 is slightly rotated clockwise in the drawing with the sheet feeding cylinder shaft 4 as the rotation center against the elastic force of the compression coil spring 31. For this reason, the claw shaft 11 fitted in the fitting insertion hole 25a of the pressing lever 25 and the claw base bar 9 fixed by the bolt 24 are also pressed leftward in the figure, and the claw shaft 11 and the claw base bar 9 are pressed. Is bent by α as shown by a two-dot chain line in FIG.
[0022]
Due to the bending of the claw shaft 11 and the claw base bar 9, the claw 13 and the claw base 10 of the swing 1 are arranged in parallel with the claw shaft 11 and the claw base bar 9 at the position a, that is, the position where the paper 6 is added. Of the claw 13 and the claw base 10, the claw and claw base at the center portion is positioned at a position retracted by α from the claw and claw base on both sides. From this state, when the feed cylinder shaft 4 is rotated and the swing 1 is rotated from the position a to the position b, the cam follower 34 comes into contact with the fixed cam 35a, so that the rod 18 in FIG. To turn. Accordingly, in FIG. 4, the pressing member 23 moves slightly upward in the drawing via the bearing 22, so that the pressing lever 25 is illustrated with the feeding cylinder shaft 4 as the center of rotation by the elastic force of the compression coil spring 31. Slightly turns counterclockwise.
[0023]
Therefore, the claw shaft 11 and the claw base bar 9 are released to the left in the drawing by the pressing lever 25, and the claw shaft 11 and the claw base bar 9 are positioned on a straight line as shown by a solid line in FIG. The plurality of claws 13 and the claw base 10 on the claw shaft 11 and the claw base bar 9 are also positioned on a straight line shown by a solid line in FIG. Accordingly, the central claw and claw base move, and as a result, the both ends of the paper 6 are pulled by the claw and claw base at both ends, and thereby the paper bottom is stretched, so that the paper bottom side extends in the left-right direction (or Even if the phenomenon (shrinking) occurs, the paper bottom is stretched by the time when the grip is changed, and these phenomena are corrected, so the encounter register is corrected.
[0024]
At this time, as shown in FIG. 4, the pressing member 23 is rotatably supported by the large-diameter portion 18 a of the rod 18 via the bearing 22 and is rotated by the braking member 28 regardless of the rotation of the rod 18. Is regulated. Therefore, as shown in FIG. 10, when the large diameter portion 18a of the rod 18 is rotated by an angle θ, the vertical displacement amount α ′ of the large diameter portion 18a is the claw shaft 11 and the claw base bar described above with reference to FIG. 9 is proportional to the amount α of deflection of the central portion. On the other hand, the amount of displacement δ in the left-right direction of the large diameter portion 18a is extremely small with respect to the amount of displacement α ′ in the up-down direction, and α ′ is in mm, whereas α ′ is in mm. The chamfered portion 23 a of the pressing member 23 hardly comes into sliding contact with the braking member 28. Moreover, since the chamfered portion 23a of the pressing member 23 is in pressure contact with the braking member 28 by surface contact, the pressure contact force is dispersed in the chamfered portion 23a. Therefore, since wear between the chamfered portion 23a of the pressing member 23 and the braking member 28 can be relatively reduced, durability is improved. Further, in order to rotate the rod 18 to bend the claw shaft 11 and the claw base 9, the cam follower 34 of the lever 33 that is pivotally attached to the rod 18 so as to follow the rotation of the feed cylinder shaft 4 is attached to the frame 2. This is done by contacting a cam 35 fixed to the side. Accordingly, since a special drive source for rotating the rod 18 is not required, not only the number of parts is reduced, but also the structure is simplified.
[0025]
Next, in order to adjust the deflection amount α of the claw shaft 11 and the claw base bar 9 corresponding to the change in the amount of extension (or the amount of contraction) on the bottom side of the paper 6, the knob 41a is rotated in FIG. When the screw rod 45 is rotated, the stud 46 moves up and down in the drawing. Accordingly, the bracket 47 also moves up and down, and the movable cam 35b rotates clockwise or counterclockwise around the pin 49 via the bracket 47, and the amount of the cam follower 34 that rides on the movable cam 35b changes. For this reason, the amount of rotation of the rod 18 changes, and the amount of pressing on the pressing lever 25 by the pressing member 23 also changes, so that the amount of deflection of the claw shaft 11 and the claw base bar 9 can be changed. In this way, the amount of deflection of the claw shaft 11 and the claw base bar 9 can be changed by rotating the knob 41a attached to the frame 2. Therefore, since the printing machine can be operated without being stopped, productivity can be improved and registration can be performed while accurate adjustment is possible.
[0026]
In this embodiment, the present invention is applied to the swing 1 of the rotating paper feed cylinder 1a. However, the present invention can also be applied to a swing that reciprocates. Further, the present invention can be applied not only to the sheet feeding cylinder 1a as a rotating body but also to other cylinders such as a paper conveying cylinder and a transfer cylinder. Moreover, although what was conveyed was made into paper, what is necessary is just a sheet-like thing which can be printed on the surface.
[0027]
【The invention's effect】
As described above, according to the present invention, the wear between the pressing member and the displacement member can be relatively reduced in order to bend the claw shaft and the claw base bar, so that the durability is improved.
[Brief description of the drawings]
FIG. 1 is a front view showing a part of a sheet-like material conveying apparatus of a sheet-fed rotary printing press according to the present invention.
FIG. 2 is a side view showing a schematic configuration of a sheet-like material conveyance device of a sheet-fed rotary printing press according to the present invention.
FIG. 3 is a cross-sectional view taken along line III-III in FIG.
4 is a cross-sectional view taken along line IV-IV in FIG.
FIG. 5 is a cross-sectional view taken along the line VV in FIG.
FIG. 6 is an enlarged front view showing a main part of the sheet-like material transport apparatus of the sheet-fed rotary printing press according to the present invention.
7 is a view taken in the direction of arrow VII in FIG. 6 for explaining the structure of the fixed cam in the sheet-like material conveyance device of the sheet-fed rotary printing press according to the present invention.
8 is a view taken in the direction of arrow VII in FIG. 6 for explaining the structure of the movable cam in the sheet-like material conveyance device of the sheet-fed rotary printing press according to the present invention.
FIG. 9 is a diagram illustrating the position of a nail when a paper is held and when the paper is replaced in the sheet-like material conveyance device of the sheet-fed rotary printing press according to the present invention.
FIG. 10 is a schematic diagram for explaining a displacement amount of a large-diameter portion of a rod at the time of paper holding and at the time of holding change in the sheet-like material conveyance device of the sheet-fed rotary printing press according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Swing, 4 ... Feed cylinder axis, 6 ... Paper, 7 ... Impression cylinder, 8 ... Support lever, 9 ... Claw base bar, 10 ... Claw base, 11 ... Claw axis, 13 ... Claw, 18 ... Rod, 19 , 21 ... bearing, 23 ... pressing member, 23a ... chamfered portion, 25 ... pressing lever, 28 ... braking member, 31 ... compression coil spring, 34 ... cam follower, 35a ... fixed cam, 35b ... movable cam, 41a ... knob.

Claims (4)

  A shaft rotatably supported between the frames, a claw and a claw base supported on the shaft side and holding an end of the sheet-like material, and a claw shaft provided with a plurality of the claw in the axial direction of the shaft. The sheet-like material conveyance device of a sheet-fed rotary printing machine that rotates the shaft and conveys the end of the sheet-like material sent from the upstream side in the conveyance direction of the sheet-like material by the claw and the claw base to the cylinder. A rod having an eccentric portion extending in parallel with the shaft and rotatably supported at both ends, a driving means for rotating the rod, and an outer peripheral portion that is rotatably fitted in the eccentric portion of the rod. A pressing member having an engaging portion formed on a part of the pressing member, and being brought into surface contact with the engaging portion of the pressing member, and being displaced through the pressing member by the rotation of the rod, the claw shaft is moved in the paper conveying direction. A single-wafer having a displacement means for bending Sheet convey apparatus for a printing press. 2. The sheet-like material transport device for a sheet-fed rotary printing press according to claim 1, wherein the engaging portion is formed in a flat shape. The single wafer according to claim 2, wherein the flat engaging portion is in surface contact with the displacing means so that the rotation of the engaging portion is restricted regardless of the rotation of the rod. Sheet-like material transport device for rotary printing machines. The displacing means is rotatably supported by the shaft, and the displacing means pivots about the shaft via the pressing member by the rotation of the rod to bend the claw shaft in the paper transport direction. The sheet-like material conveyance device for a sheet-fed rotary printing press according to claim 3.

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