JPS6127191B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feed cylinder device in a sheet-fed printing press that grips and transports sheets of paper fed one by one onto an interfering plate, releases them at a predetermined position, and supplies them to a printing cylinder. be.

Conventionally, swing devices have been widely used to perform the function of this type of paper feed cylinder device. This swing device is equipped with a swing shaft that is driven by a drive device consisting of a cam and a link to reciprocate in forward and reverse directions, and a plurality of gripping claw devices (hereinafter referred to as claws) are mounted on this swing shaft. ) are installed in parallel. The paper fed onto the differential plate is gripped by the claws and then conveyed by the forward rotation of the swing shaft, and when the swing shaft rotates by a predetermined angle, it is released from the claws and is gripped by the claws on the impression cylinder side. Can be replaced. The claw of the swing device which released the paper returns to the gripping position near the insert plate by the reverse rotation of the swing shaft at a position past the grip change position, grips the next sheet, and then repeats the above operation.

However, in this type of swing device, the pawl is stopped at the point where it grips the paper on the insert plate, accelerates while conveying the paper in its grip, reaches maximum speed, releases the paper, and then decelerates. The pendulum movement is repeated, in which the pendulum is turned back at a stopping point. Conventionally, this pendulum movement was performed using a cam mechanism, so the pawl, which is stopped at the paper gripping position, is moved at a cam angle of about 50°. When trying to accelerate to the same circumferential speed as the high-speed rotating impression cylinder, the cam surface suddenly became unreasonable, resulting in premature wear of the cam.

In order to solve this problem, the applicant of the present application proposed a paper feed cylinder device in Japanese Patent Application No. 1983-44364 that enables deceleration at the paper holding position and speed increase at the paper release position. In this device, a paper feed gear that rotates at a constant speed and is supported by a frame supports a paper feed cylinder that can be opened and closed and is equipped with a claw, and the rotation of the paper feed gear is transmitted to the paper feed cylinder using a link mechanism. At the same time, an increasing/decelerating device is installed to increase/decelerate the rotation of the paper feed cylinder at predetermined positions during one rotation. The rotation angle of the paper was increased, which reduced the load on each part, and also ensured paper holding and paper transfer operations. Further, in Japanese Patent Application No. 57-51751, the applicant of the present invention proposed a paper feed cylinder device in which the spring means for biasing the paper gripping pawl in the closing direction in the above device was improved.

In this way, by providing a paper feed cylinder device instead of the swing device, the drawbacks of the swing device can be overcome. However, in each of the above devices, the speed increasing cam and the decelerating cam are independent of each other on the left and right frames. Since the printer is provided with a holder, its movement tends to be difficult and the structure is rather complicated, and it is not always possible to expect satisfactory performance in terms of printing accuracy.

The present invention has been made in view of the above points, and includes a main accelerating/decelerating cam mechanism that increases or decelerates the rotation of a paper feed cylinder having gripping claws on its outer periphery at predetermined positions during one rotation, and the cam. An auxiliary speed-up/deceleration cam having an inner cam surface facing the outer cam surface is provided, and an auxiliary roller on the auxiliary cam lever pivotally connected to the cam lever of the main speed-up/deceleration cam mechanism is pressed against the auxiliary speed-up/deceleration cam by a spring member. By configuring the main roller on the cam lever to come into contact with the main accelerating/decelerating cam using the pressure reaction force, it is possible to ensure paper gripping and paper transfer operations, improve paper feeding performance, and increase speed. To provide a paper feed cylinder device for a sheet-fed printing press in which a device and a deceleration device are assembled on one side to simplify the structure and improve printing accuracy by eliminating complicated movements. below,
Embodiments of the present invention will be described in detail with reference to the drawings.

1 to 6 show an embodiment of the paper feed cylinder device according to the present invention, FIG. 1 is a longitudinal cross-sectional view of the paper feed cylinder device partially expanded, and FIG. 2 is the AA of FIG. 1. Cross-sectional view, Figure 3 is the BB cross-sectional view of Figure 1, Figure 4 is the BB cross-sectional view of Figure 1.
Fig. 5 is an enlarged sectional view of DD in Fig. 1 shown without being developed; Fig. 6 is an enlarged longitudinal sectional view of the acceleration/deceleration drive unit in Fig. 1; Fig. 7 is a trajectory diagram of the claws. It is. In these figures, a drive shaft 2 that rotates synchronously with the printing cylinder is supported on the left and right frames 1 of the printing press, and a drive gear 3 on the drive side and a drive gear 3 on the operation side are respectively mounted on the drive side and the operation side. A drive gear 4 is fixed and pivoted with a key and a nut. Similarly, on the left and right frames 1, a drive side paper feed gear 5 and an operation side paper feed gear 6, which mesh with both drive gears 3 and 4 and rotate counterclockwise when viewed from the drive side, are respectively rotatably mounted. Further, a paper feed cylinder shaft 7 is rotatably supported on both paper feed gears 5 and 6. A drive-side disc 8 and an operating-side disc 9 are respectively pivotally attached to the paper feed cylinder shaft 7 in close proximity to the frame 1, and between the two discs 8 and 9 there are a plurality of intermediate discs. A disk 10 is pivotally mounted, and these disks 8, 9, 10 and the feed cylinder shaft 7 constitute a feed cylinder. Further, above the paper feed cylinder, an impression cylinder 11 rotating in the opposite direction is pivotally supported by the frame 1 with its circumferential surface slightly spaced from the circumferential surfaces of the disks 8, 9, and 10.

Reference numeral 12 denotes a pawl shaft rotatably supported on the outer circumference of the discs 8, 9, and 10, and a plurality of pawls 13 are rotatably supported on this shaft in parallel at predetermined intervals. ing. Also, each disk 8, 9, 10
A nail rest bar 14 is supported by connecting the end edge on the nail shaft 12 side to the notch provided in the notch, and nail rests 15 are arranged in parallel on this bar in correspondence with the respective claws 13. It should be noted that the clockwise direction of the claw 13 when viewed from the driving side is the closing direction, that is, the direction in which the pawl 13 grips the paper, and the counterclockwise direction is the opening direction, that is, the direction in which the paper is released.

Therefore, the opening/closing device of this claw 13 will be explained. A cam base 16 is rotatably mounted on the drive shaft 2 in close proximity to the frame 1 on the operation side, and a pawl closing actuation cam 1 having a small diameter on a part of the cam surface is mounted on the drive shaft 2.
7 is attached through a long hole so that the phase can be freely adjusted. Further, a cam lever 19 is rotatably fitted to a pivot shaft 18 implanted in the frame 1, and a roller 20 at the free end of the cam lever 19 is brought into contact with the cam surface of the pawl-closing cam 17. Furthermore, the cam lever 19
The roller 20 is urged by a compression coil spring 22 bonded between the spring support 21 on the frame 1 side in a direction to bring the roller 20 into pressure contact with the cam surface of the pawl closing operation cam 17. On the other hand, a support lever 23 is freely rotatably mounted on the paper feed cylinder shaft 7 in the vicinity of the frame 1, and its free end is connected to the cam lever 19 by a connecting rod 24. . And nail 1
The claw opening/closing cam 25 that opens and closes the support lever 2
3 with a bolt, and is loosely mounted on the paper feed cylinder shaft 7 together with the support lever 23 via a bush. On the other hand, a spring tube 26 is rotatably supported on the outer periphery of both discs 8 and 9 with a collar 27 restricting its movement in the axial direction. A pawl opening/closing lever 28 having the spring tube 26 as a pivot is fixed to the protruding portion by split fastening. The pawl opening/closing lever 28 here is formed into a circular arc shape, and a segment gear 29 integrally formed at its free end is connected to a pinion 30 fixed on the pawl shaft 12.
The cam follower 31 is engaged with the cam follower 31 and pivotally mounted at the center thereof, and is in contact with the cam surface of the pawl opening/closing cam 25. By doing this, the paper feed cylinder shaft 7
When the cam follower 31 rotates and comes into contact with the large diameter part of the pawl opening/closing cam 25, the pawl shaft 12 rotates via the segment gear 29 and pinion 30, opening the pawl 13. When it comes into contact with the small diameter part, the pawl 13 closes. This bias in the closing direction is applied to the spring tube 2.
This is done by the torsion bar 32 in 6.
That is, a bush 33 is fitted into the shaft support of the spring tube 26 on the disk 9 side and is integrated with a knock pin, and the hexagonal head of the torsion bar 32 is inserted into the hexagonal hole of the bush 33 and rotates. is locked. The torsion bar 32, which has one end fixed in this manner, is formed into a rod shape from spring steel, and extends in the axial direction of the paper feed cylinder shaft 7 through the inside of the spring tube 26, and the hexagonal head at the other end is , is inserted into a hexagonal hole of a holder 34 fixed to the other disc 8, and its rotation is restricted. This torsion bar 32 is constructed by slightly accumulating a spring force at the position where the cam follower 31 abuts the small diameter portion of the pawl opening/closing cam 25 and fixing the spring tube 26 and the pawl opening/closing lever 28 by splitting. It is integrated with 26. Therefore, when the cam follower 31 comes into contact with the large diameter portion of the pawl opening/closing cam 25, the spring tube 26 rotates due to the rotation of the pawl opening/closing lever 28, but the torsion bar 32, whose one end is fixed to the holder 34, only has one end. When the lever rotates, it is twisted and a spring force is accumulated, and a rotational force in the closing direction of the pawl 13 is applied to the pawl opening/closing lever 28. Furthermore, a cam follower 36 is pivotally attached to a cam lever 35 that is pivoted to the other end of the pawl shaft 12, and a cam follower 36 is pivotally attached to the frame 1.
A claw opening cam 3 that assists in opening the claw 13 in response to the
7 is provided.

For the paper feed cylinder and pawl opening/closing device configured as described above, the paper feed cylinder shaft 7 and the paper feed gears 5, 6 are connected to each other, and the rotation of the paper feed gears 5, 6 is increased/decelerated. An accelerating/decelerating device for transmitting information to the paper feed cylinder shaft 7 is provided outside the frame 1 on the drive side. That is,
A pinion 3 is provided on the driving side shaft end surface of the paper feed cylinder shaft 7.
8 are concentrically fixed by bolts 40 via a thrust bearing 39, and the paper feed gear 4
A cam lever 43 formed in a fan shape is prevented from coming off by a washer 44 and a bolt 45, and is attached to a lever shaft 42 with a flange fixed to an eccentric part of the lever shaft 42 by a bolt 41. It is pivotally supported. The cam lever 43 has the pinion 3
A segmented gear 47 having a circular arc shape and meshing with 8 is integrally fixed with bolts 48. on the other hand,
A disk-shaped cam mounting portion 4 is provided on the outer surface of the frame 1.
Cam base 4 integrally formed with support part 9a and support part 49b
9 is fixed with bolts 50 and 51, and a disc-shaped cam mounting portion 49a is parallel to the frame 1 and stands upright on the outside of the cam lever 43. code 52
The one shown by is a main increasing/decelerating cam that is fitted into the center of the cam mounting part 49a and fixed with a bolt 52c, and is separated from the large diameter part 52a, the small diameter part 52b, and the upward and downward slopes between them. It has a cam surface on the outer periphery. Moreover, what is indicated by the symbol 53 is
The auxiliary increase/decelerate cam is fixed to the outer periphery of the cam mounting portion 49a with a bolt 54, and is the main increase/decelerate cam 5.
On the outside of the outer circumferential cam surface of No. 2, an inner circumferential cam surface is provided opposite to the outer circumferential cam surface. . The cam lever 43 has a lever shaft 42 which is the center of its swing.
A main roller 55 formed of a ball bearing is pivotally mounted adjacent to the main roller 55, and is pressed against the outer circumferential cam surface of the main accelerating/decelerating cam 52 by the elastic force of a spring member, which will be described later.

In addition, the cam lever 43 has an auxiliary cam lever 56.
is pivotally attached to the lever shaft 42 by a pin 57 at a position approximately 90 degrees out of phase in the circumferential direction, and an auxiliary roller 5 is provided at the free end close to the main roller 55.
8 is an auxiliary acceleration/deceleration cam 53 by a spring member to be described later.
It is pivotally mounted in pressure contact with the inner circumferential cam surface of the cam. Reference numeral 59 denotes a plurality of disc springs as spring members loaded into a spring hole formed in the outer peripheral surface of the boss portion of the cam lever 43, and the auxiliary roller 58 is connected to the inner peripheral cam of the auxiliary acceleration/deceleration cam 53. A rotational force is applied to the auxiliary cam lever 56 in the direction of pressing the main roller 55 against the outer circumferential cam surface of the main increasing/decelerating cam 52, and a rotational force is applied to the cam lever 43 in the direction of pressing the main roller 55 against the outer circumferential cam surface of the main accelerating/decelerating cam 52. ing. The reference numeral 60 is an assembly bolt that passes through the auxiliary cam lever 56 and is screwed into the cam lever 43. When assembling the speed increase/deceleration device, the auxiliary cam lever 56 is held while the leaf spring 59 is compressed. It is provided for ease of use and is removed after assembly.

The operation of the paper feed cylinder device configured as described above will be explained. When the printing operation is started, the impression cylinder 11 rotates clockwise as shown by arrow E in FIG. Rotates counterclockwise when viewed from the side.
Further, one sheet of paper 62 is fed into the differential plate 61 for each rotation of the impression cylinder 11. A cam lever 43 is pivotally connected to the paper feed gear 5 on the driving side by a lever shaft 42, and a segment gear 47 integrated with the cam lever 43 is integrated with the paper feed cylinder shaft 7 and meshes with a pinion 38, so that the segment gear As long as the paper feed cylinder shaft 7 and the paper feed gear 6 do not move while being engaged with each other, the paper feed cylinder shaft 7 and the paper feed gear 6 rotate at the same speed. And the claw shaft 1
When the paper feed cylinder shaft 7 rotates until the paper feed cylinder shaft 7 is positioned in front of the difference plate 61, the main roller 55, which was running in sliding contact with the outer circumferential cam surface of the main accelerating/decelerating cam 52 fixed to the frame 1 side, moves to the cam surface. from the small diameter portion 52b to the large diameter portion 52
Since the cam lever 43 moves clockwise in FIG. Similarly, the fifth
Rotate it clockwise as shown. Since this rotating direction is opposite to the rotation direction inherent to the paper feed cylinder shaft 7 rotating together with the paper feed gear 5, the rotation is canceled out and decelerated, and the claw shaft 12 has a low speed. and reaches the tip of the difference plate 60. At this time, the cam follower 31 of the pawl opening/closing device moves from the large diameter part to the small diameter part of the pawl opening/closing cam 25, which is supported in a stationary state by the support lever 23, so that the elastic force accumulated in the torsion bar 32 causes the cam follower 31 to move from the large diameter part to the small diameter part. 28 rotates, and the claw shaft 12 rotates through the meshing of the segment gear 29 and pinion 30, so that the claw 13 closes and grips the edge of the paper. When the paper is picked up, the deceleration of the paper feed cylinder shaft 7 causes the rotational speed of the cam follower 31 that rotates integrally with the paper feed cylinder shaft 7 to be decelerated, and the claw closing operation tends to be decelerated. However, at this time, the end of the large diameter part of the pawl closing actuating cam 17 that rotates with the drive shaft 2 comes into contact with the roller 20, and the roller 20 moves to the small diameter part of the cam 17, so that the elastic force of the compression coil spring 32 causes the connection to close. The pawl opening/closing cam 25 is rotated via the rod 24 and the support lever 23 in a direction opposite to the circumferential direction of the roller 31. Therefore, the result is the same as if the rotational speed of the rollers 31 were increased, and the claw closing operation becomes faster and the paper 62 is reliably held in the grip.

In this way, the pawl 13 holding the paper 62 in its mouth continues to rotate toward the position facing the pawl 63 of the impression cylinder 11 as the paper feed gears 5 and 6 rotate, but at this time, the main roller 55 moves to the main accelerating/decelerating cam. 52, the cam lever 43 rotates counterclockwise in FIG. 5 about the lever shaft 42, and the segment gear 4
7 and the pinion 48, the paper feed cylinder shaft 7 is similarly rotated counterclockwise in FIG. Since this rotational direction is the same as the rotational direction inherent to the paper feed cylinder shaft 7 rotating together with the paper feed gear 5, the rotation speeds of both are added and increased, and the claw shaft 12 is It faces the pawl 63 of the impression cylinder 11 at a high speed equal to the circumferential speed of the impression cylinder 11. At this time, the roller 31 of the pawl opening/closing device moves from the small diameter part to the large diameter part of the pawl opening/closing cam 25, so the pawl shaft 12 rotates against the elastic force of the torsion bar 32, and the pawl 13 opens. Release the edge of the paper. In this manner, the circumferential speed of the pawl 13 when releasing the paper is the same as the circumferential speed of the impression cylinder 11, so that the paper 62 is reliably transferred to the pawl 63 of the impression cylinder 11.

In the acceleration/deceleration operation of the paper feed cylinder device as described above, since the disc spring 59 is not interposed between the auxiliary cam lever 56 and the cam lever 43, its elastic force causes the auxiliary cam lever 56 to move to the second position. 5
A rotational force is applied to the cam lever 43 in the counterclockwise direction in the figure, and the cam lever 43 is similarly applied with a rotational force in the clockwise direction. Therefore, the auxiliary roller 58 is pressed against the inner cam surface of the auxiliary speed-up/deceleration cam 53, and the main roller 55 is pressed against the outside cam surface of the main speed-up/down cam 52 due to the reaction force of this pressure. So both cams 52,5
If the cam surface of No. 3 is set so that the relative position of both rollers 55, 58 does not always change, the disc spring 59 will not expand or contract and both rollers 55, 58 will always be applied to the cam surface with the same spring pressure. Pressed. Furthermore, even if machining accuracy cannot be obtained for both cams 52 and 53, the main roller 55 is always in pressure contact with the cam surface of 52 of the main accelerating/decelerating cam just by slightly expanding and contracting the disc spring 59. Since it moves accurately along the plane, the rollers do not play in the cam groove or get twisted, unlike in the case of grooved cams.

As is clear from the above description, according to the present invention, in the paper feed cylinder device of a sheet-fed printing press, the rotation of the paper feed cylinder equipped with gripping claws on the outer periphery is increased/decelerated at predetermined positions during one rotation. A main increase/decelerate cam mechanism is provided, and an auxiliary increase/decelerate cam is provided with an inner cam surface opposite to the outer cam surface of the cam. By making the main roller on the cam lever come into pressure contact with the main speed increasing cam by pressing the auxiliary speed increasing/decelerating cam with a spring member and using the reaction force of the pressure contact, deceleration at the paper gripping position and speed increase at the paper release position can be achieved. Not only is the original effect of the paper feed cylinder device, which improves paper feed performance by increasing speed and ensuring reliable paper gripping operation, but also the fact that the speed increaser and deceleration device are located on the same side of the machine base, Since the acceleration/deceleration is performed by a pair of cams that effectively utilize the spring members, the structure is simplified and equipment costs can be significantly reduced. Compared to those with separate cams or grooved cams, there is no twisting or loose movement of pins or gears, and printing accuracy is significantly improved. In addition, by eliminating play between the cam and the roller, the speed of the machine can be significantly increased, and since the elastic force of the spring member remains constant, the durability of the roller and spring member is improved. will improve.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the paper feed cylinder device according to the present invention, FIG. 1 is a longitudinal cross-sectional view of the paper feed cylinder device partially expanded, and FIG. 2 is the AA of FIG. 1. Cross-sectional view, Figure 3 is the BB cross-sectional view of Figure 1, Figure 4 is the BB cross-sectional view of Figure 1.
Fig. 5 is an enlarged sectional view of DD in Fig. 1 shown without being developed; Fig. 6 is an enlarged longitudinal sectional view of the acceleration/deceleration drive unit in Fig. 1; Fig. 7 is a trajectory diagram of the claws. It is. DESCRIPTION OF SYMBOLS 1...Frame, 5, 6...Paper feed gear, 7...Paper feed cylinder shaft, 13...Claw, 38...Pinion, 43...Cam lever, 47...Segment gear, 52...Main acceleration/deceleration cam, 53...Auxiliary acceleration/deceleration cam, 55 ...Makoro, 56
...Auxiliary cam lever, 58...Auxiliary roller, 59...Disc spring.

Claims (1)

[Claims] 1. A paper feed cylinder that is supported in the center shaft hole of a paper feed gear 5 that is rotatably supported on a frame 1 and rotates at a constant speed, and that has a gripping claw 13 that can be opened and closed on its outer circumference, and the shaft end of this paper feed cylinder. A pinion 38 fixed to
A cam lever 43 includes a segmented gear 47 with internal teeth that meshes with the paper feed gear 5, and a main roller 55 pivoted to the cam lever 43 is fixed to the frame 1 side with the main roller 55 facing the outer cam surface. A main accelerating/decelerating cam 52, an auxiliary cam lever 56 which is pivotally connected to the cam lever 43 and has an auxiliary roller 58 at its free end, and the auxiliary roller 58 is brought into contact with the inner circumferential cam surface on the frame 1 side. A fixed auxiliary acceleration/deceleration cam 53 is interposed between the free end portion of the cam lever 43 and the free end portion of the auxiliary cam lever 56, and applies rotational force in the direction of separating these free end portions from each other. A paper feed cylinder device for a sheet-fed printing press, characterized in that a compression spring 59 is provided to a cam lever of the sheet-fed printing press.