JPH0335080B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to a perforation machine cylinder used for perforating or cutting in a business form rotary printing machine, etc., which performs perforations or cutting by rotation. Attaching the blade to the rotary processing cylinder,
This invention relates to a blade changing device used for removal.

BACKGROUND TECHNOLOGY Continuous forms such as computer printer forms have perforations for separating and folding each set. This perforation is provided perpendicular to the flow of continuous forms, and the pitch of the perforation (length of the cut and uncut part) is determined by the paper type (paper thickness, paper quality) and the post-processing method (hand-cut, machine-cut). etc. are selected and processed. When perforating a continuous form using a form rotary printing machine, a cylindrical perforation machine body consisting of a thin strip-shaped perforation blade inserted and fixed into a groove formed in the longitudinal direction on the outer circumferential surface and a perforation machine installed opposite to the perforation machine body are used. The paper is passed between the perforation cylinder and the receiving cylinder, and perforations are made at regular intervals by rotating the perforation cylinder and the receiving cylinder.

Conventionally, as shown in FIG.
As a means for fixing the sewing machine blade 3 to the sewing machine, a presser plate 5 having hexagonal bolts 6 screwed together at regular intervals is used. In this structure, in order to assemble the perforation blade 3 to a predetermined depth, first insert the perforation blade 3 into the groove 2, and raise it higher than the height at which the predetermined perforation can be made (increase the amount of protrusion from the groove). setting, turn the bolt 6 and lightly press the presser plate 5 against the sewing machine blade to temporarily fix it. At this time, the holding force of the holding plate 5 is weaker than that at the final setting, so that if the cutting edge is pushed strongly, it will be pulled into the groove (hereinafter referred to as temporary tightening). Next, rotate the sewing machine barrel and receiver barrel, and apply the cutting edge of the sewing machine blade to the receiver barrel, leveling it so that it contacts the receiver barrel evenly in the width direction.
After this, the bolt 6 is turned again to firmly press the presser plate 5 against the blade 3 to fix the blade (hereinafter referred to as final tightening).

Problems to be Solved by the Invention The work of assembling the blade to the sewing machine barrel as described above is done manually, but when assembling the sewing machine blade once, many bolts 6 are temporarily tightened and finally tightened evenly. This requires great skill, and requires a great deal of time. Particularly when temporarily tightening, the sewing machine blade is pressed down with such a slight pressure that it will be pulled into the groove, so it is difficult to adjust all the bolts uniformly to achieve such a delicate pressure. It is extremely difficult, and the more bolts there are, the more difficult it becomes.

Therefore, it is an object of the present invention to provide a blade changing device capable of attaching and removing a sewing machine blade or a cutting blade into a groove of a rotary processing cylinder such as a thin strip-shaped sewing machine cylinder. purpose.

Means for Solving the Problems As a result of various studies on mechanizing the blade assembly work, the inventors of the present invention found that the bolt 6 for tightening and loosening the blade is oriented horizontally in the groove 2, as shown in FIG. Since it is difficult to turn the blade 3 from above the groove if the blade 3 is placed in the groove 2, the blade 3 is fixed in the groove 2 using a bolt 14 placed in the depth direction of the groove, as shown in Fig. 3. We have developed a blade fixing device 11 and a blade changing device that can automatically insert the blade into the groove and tighten and loosen the bolt 14.

The blade changing device of the present invention includes a pedestal 22 and a pedestal 22.
2, and is movable in the direction toward and away from the rotary machining cylinder 1 while maintaining a parallel state to the rotary machining cylinder 1; A blade holder 30 that holds the blade 3 parallel to the barrel and with the side surface of the blade 3 parallel to the moving direction of the support member 26; Each of the power wrenches 40 is a bit that engages with a bolt head to rotate it, and the support member 2
A bit 41 provided parallel to the moving direction of 6;
A motor 4 that rotates the bit 41 in both forward and reverse directions.
2, means for controlling the tightening torque in the positive direction to a predetermined value, and a coupling 43 for allowing the bit 41 to retreat in the axial direction, and the power wrench 40 and the blade holder 30 are , when the support member 26 approaches the rotary processing cylinder 1, the bit 41 at the tip of each wrench engages with the head of the bolt 14,
Moreover, it is characterized in that the blade 3 held by the blade holder 30 is attached at a position where it can be inserted into the groove.

Effect According to the blade changing device having the above configuration, the rotary machining cylinder 1
The groove 2 of the blade holder 3 is directed upward, and the blade holder 30 and the power wrench 40 are positioned above the groove 2.
When the support member 26 is lowered from above the rotary machining cylinder 1 while holding the blade 3 in the groove 2, the blade 3 held by the blade holder 30 is inserted into the groove 2 at a predetermined position.
At the same time, the bit 41 of each power wrench 40 engages with the head of the corresponding bolt 14 (specifically, with the hexagonal hole 14A in the head), and each bolt 14 is tightened to a predetermined tightening torque. At this time, bit 4
If the phase of bit 1 and the phase of the corresponding hexagonal hole do not match, the bit 41 will not be inserted into the hexagonal hole of the bolt 14, and therefore the bit 41 will hit the head of the bolt 14 and be prevented from descending. However, since the bits 41 can be retracted by the coupling 43, there is no problem, and as each bit 41 rotates,
The bits 41 that match the phase are inserted into the hexagonal holes of the corresponding bolts one after another, and finally engage with all the bolts. In this way, all the bolts are tightened to a predetermined torque (for example, temporary tightening torque or final tightening torque). Conversely, the support member 26 is lowered into the groove 2 where the blade is fixed, each bit 41 is engaged with the head of the bolt 14, and the bit is reversed to loosen the bolt and fix the blade 3. The blade 3 can also be removed by releasing and holding the blade 3 in the blade holder 30 and then raising the support member 26.

Embodiments Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Although the following explanation applies the present invention to blade replacement of a sewing machine barrel, the present invention is not limited thereto, and can be applied to any rotary processing cylinder in which a thin strip-shaped blade is attached to a groove formed on the outer peripheral surface. This can be applied to blade replacement.

FIG. 6 is a perspective view showing a sewing machine barrel 1 suitable for using the blade changing device of the present invention and a receiver barrel 4 disposed opposite to the sewing machine barrel 1. The sewing machine barrel 1 has a plurality of grooves 2 on its outer peripheral surface, and the sewing machine blade 3 is inserted into the groove 2 by the blade fixing device 1.
It is fixed by 1.

As shown in FIGS. 3, 7, and 8, the blade fixing device 11 has a blade holding block 1 disposed in the groove 2.
2 and a wedge block 13. The blade holding block 12 is arranged so as to be in contact with the sewing machine blade 3 and the bottom surface of the groove, and the surface opposite to the surface that contacts the sewing machine blade is inclined so as to become narrower toward the bottom of the groove. There is. On the other hand, the wedge block 13 has a side surface that contacts the blade holding block 12 and the groove side surface, and when it moves toward the groove bottom, the wedge effect pushes the blade holding block 12 in the direction of the sewing machine blade 3, causing the sewing machine blade 3 to If you fix it and move it upwards,
This allows the blade holder block to be loosened and the sewing machine blade 3 to be removed. As a means for moving the wedge blocks 13 in the direction toward the groove bottom and vice versa, a hexagon socket head bolt 14 is arranged at the center of each wedge block 13, and a hexagon socket head bolt 14 is provided on the upper surface of the wedge block 13 to prevent the head of the bolt 14 from coming off. A receiving plate 17 is attached. A hole is formed in the receiving plate 17 for inserting a bit, which will be described later, into a hexagonal hole 14A in the head of the bolt 14. Thus, by turning the bolt in the forward and reverse directions, the wedge block 13 can be moved up and down (in the direction toward the groove bottom and in the opposite direction). A pair of coil springs 18 are provided between the wedge block 13 and the bottom surface of the groove 2 so that the wedge block 13 can move up and down without tilting. Further, a leaf spring 19 is arranged between the blade holding block 12 and the side surface of the groove 2 at a position that does not interfere with mounting the sewing machine blade. When the wedge block 13 is moved upward, this leaf spring 19 pushes out the blade holding block 12 toward the wedge block 13 and creates a space between it and the side surface of the groove 2.
It acts to form a gap for inserting the sewing machine blade 3. As can be clearly seen from FIG.
There are multiple sets of suitable lengths (in the example, 5 sets).
Therefore, a plurality of bolts 14 are used for one groove 2.

1 and 2 are a side sectional view and a front view showing a blade changing device 20 which is a preferred embodiment of the present invention. The blade changing device 20 has a mount 22 movably held on a frame 21 of a rotary printing press to which the sewing machine cylinder 1 is attached. The pedestal 22 has a linear bearing 23 that engages a rail on the frame 21, a horizontal beam 2
4, a support member 26 is supported by a linear bearing 27 so as to be movable up and down. When the support member 26 is in the illustrated operating position, the support member 26 is movable toward and away from the sewing machine barrel 1 while remaining parallel to the sewing machine barrel 1. Further, a horizontal beam 28 is connected to the upper end of the support column 25, and a pneumatic cylinder 29 is held on the beam 28. The pneumatic cylinder 29 moves the support member 26 up and down.

Two blade holders 30 are held on the support member 26 . The blade holder 30 holds the long sewing machine blade 3 parallel to the sewing machine barrel 1, and the side surface of the sewing machine blade is attached to the support member 2.
The blade holder 30 is held parallel to the moving direction of the blade holder 30. In the illustrated embodiment, the support member 26 moves up and down, so the blade holder 30 holds the sewing machine blade 3 so that its side surface is vertical. To specifically explain the blade holder 30 of this embodiment, in FIGS. 3 and 5, the blade holder 30 includes an outer case 31 held on the support member 26 via a suitable rod, Inner case 32 held movably up and down, Inner case 32
a spring 33 that acts in a direction to push out the inner case 32 from the outer case 31, a pin 34 for preventing the inner case 32 from falling off, a blade suction member 36 that is held in the inner case 32 so as to be movable up and down and has a magnet 35 at the lower end, and a blade suction member 3
6 in a direction in which its lower end protrudes from the inner case 32. The lower end of the inner case 32 has a first reference surface 32A that regulates the position of the cutting edge of the sewing machine blade 3 and a second reference surface 32B that abuts against the outer peripheral surface of the sewing machine barrel 1. Blade holder 3 with the above structure
0, as shown in FIG. 3, the magnet 35 at the lower end of the blade suction member 36 normally protrudes from the lower end of the inner case 32, and the sewing machine blade 3 can be held vertically on the side surface of this magnet 35. When the blade holder 30 holding the sewing machine blade 3 is lowered from above the groove 2 of the sewing machine barrel, the sewing machine blade 3 is inserted into the groove as shown in FIG. As the blade holder 30 continues to descend,
First, the magnet 35 comes into contact with the outer peripheral surface of the sewing machine barrel 1, but since the magnet 35 can be retreated into the inner case 32, the inner case 32 continues to descend without any problem.
The sewing machine blade 3 is also inserted into the groove 2. When the second reference surface 32B of the inner case 32 abuts against the outer peripheral surface of the sewing machine barrel 1, further descent of the inner case 32 and the sewing machine blade 3 is prevented, and the cutting edge of the sewing machine blade 3 is brought into contact with the first reference surface 32A and the second reference surface 32A. It is positioned at a predetermined position that protrudes from the outer peripheral surface of the sewing machine barrel by an amount determined by the reference surface 32B. Note that even if the blade holder 30 is further lowered, only the outer case 31 is lowered, so the position of the sewing machine blade 3 will not be disturbed.

The support member 26 is further provided with a power wrench 40 corresponding to the bolt 14 of the sewing machine barrel 1. Each of the power wrenches 40 includes a bit 41 that can engage and turn the hexagonal hole 14A of the head of the bolt 14, a motor 42 that rotates the bit 41 in both forward and reverse directions, and a motor 42 that applies tightening torque in the forward direction. It has means (not shown) for controlling it to a predetermined value and a coupling 43 for connecting the bit 41 to a motor 42, the bit 41 being arranged parallel to the direction of movement of the support member 26. The coupling 43 is of a type that at least allows the bit 41 to retreat in the axial direction, and is preferably flexible so that the bit 41 can be tilted. The bit 41 has a hexagonal cross section so that its lower end engages with the hexagonal hole of the bolt 14, but the insertion part into the hexagonal hole is rounded in the axial direction so that it can be inserted into the hexagonal hole of the bolt even in an oblique state. It is preferable to have the following. Such couplings and bits are
Even if the center of the bit 41 and the center of the hexagonal hole of the bolt 14 are slightly misaligned, there is an advantage that the bit 41 can be tilted and inserted well into the hexagonal hole 14A.

As means for controlling the tightening torque of the motor 42 to a predetermined value, known means can be used, such as means for controlling the output torque of the motor 42 to be constant, and means for controlling the output torque of the motor 42 to a predetermined value. A torque sensor is placed between the bit and the motor to detect the tightening torque of the bit, and the motor is stopped when a predetermined value is reached, or a connection between the motor and the bit is used. You can use something to remove it. In this embodiment, a DC motor is used as the motor 42, and when the current applied to the DC motor reaches a set value, it is determined that the bolt has been tightened with a predetermined torque, and the current to the DC motor is cut off. A control circuit is provided to This control circuit allows setting of two types of current setting values, one for temporary tightening and one for final tightening, and therefore it is possible to tighten the bolt to either the temporary tightening torque or the final tightening torque.

The blade holder 30 and the power wrench 40 operate when the support member 26 is lowered and approached the sewing machine barrel 1.
The bit 41 at the tip of each wrench engages with the hexagonal hole 14A of the head of the bolt 14, and the sewing machine blade 3 held in the blade holder 30 is installed in a position to be inserted into the groove 2.

Next, how to use the blade changing device 20 will be explained.

Normally, the blade changing device 20 is moved to a position to the right of the position shown in FIG. 1, where it does not interfere with perforation processing. When replacing the sewing machine blade, the sewing machine barrel 1 is first positioned at a predetermined rotational position for replacing the blade, and the groove 2 is located directly above the center of the sewing machine barrel 1. Next, the blade changing device 20 is positioned at the position shown in FIG.

Next, the pneumatic cylinder 29 is actuated to
is lowered, and at the same time, the motor 42 rotates in the forward direction (in the direction of tightening the bolt 14) to slowly rotate the bit 41. The lowering of the support member 26 causes the bits 41 to lower and come into contact with the heads of the respective bolts 14. At this time, the bit 41 and the hexagonal hole 14A of the bolt head are not necessarily in phase, so the bit 41 immediately aligns with the hexagonal hole 14A of the bolt.
Although not inserted into A, since the bit 41 can be retracted in the axial direction, there is no problem in lowering the support member 26. Since each bit 41 is rotating, the bolt 41 is inserted one after another into the hexagonal hole 14A starting from the bit 41 that matches the phase of the hexagonal hole 14A. The inserted bit 41 acts to further tighten the bolt 14, but since the bolt 14 is already sufficiently tightened, the bit 41 does not rotate and simply remains inserted into the hexagonal hole. After all the bits 41 are inserted into the hexagonal holes 14A of the bolts, the motor 42 rotates in the opposite direction for a predetermined period of time to simultaneously loosen all the bolts 14 and move the wedge block 13 above the groove 2. Wedge block 13
As the blade rises, the blade holding block 12 releases the leaf spring 19.
to release the fixation of the sewing machine blade 3. Therefore, the sewing machine blade 3 is attracted and held by the magnet 35 of the blade holder 30. Thereafter, the support member 26 is raised by the operation of the pneumatic cylinder 29. As the support member 26 rises, the blade holder 30 pulls out the sewing machine blade 3 from the groove 2, and each bit 41 separates upward from the bolt 14. This completes the sewing machine blade removal operation.

Next, remove the old sewing machine blade 3 held by the blade holder 30 and put it in the state shown in FIGS. 1 and 2.
Hold the new sewing machine blade 3. After that, the support member 26 is lowered again by the pneumatic cylinder 29,
Moreover, each motor 42 is rotated in the forward direction. Then, the blade holder 30 descends as shown in FIG. 4, inserts the sewing machine blade 3 into the groove 2 at a predetermined position, and holds it at that position. Meanwhile, the bit 41 is also lowered and inserted into the hexagonal hole 14A of the bolt 14, and the bolt is tightened to move the wedge block 13 toward the bottom of the groove 2, and the sewing machine blade 3 is inserted through the blade holding block 12.
to be fixed. Even at this time, all the bits may not be inserted into the hexagonal holes of each bolt at the same time, but as the bits rotate, they will be inserted one after another into the hexagonal holes of the bolts without any problem. The motor 42 rotates the bit 41 in the forward direction and tightens the bolt 14, but when the bolt 14 is tightened to a predetermined torque required for temporary tightening, the motor 42 stops rotating.
After all the motors 42 have stopped rotating, the motor 4
2 rotates slightly in the opposite direction, releasing the large contact pressure between the bit 41 and the inner wall of the hexagonal hole 14A of the bolt 14, and making it easier for the bit 41 to come out from the hexagonal hole 14A. Thereafter, the support member 26 is raised by the pneumatic cylinder 29 to separate the bit 41 from the bolt and at the same time separate the blade holder 30 from the sewing machine blade 3. With this, the temporary tightening operation of the sewing machine blade 3 is completed.

Next, the sewing machine barrel 1 is rotated, the temporarily tightened sewing machine blade 3 is brought into contact with the receiving barrel 4, and the sewing machine blade 3 is pushed to a predetermined depth. Thereafter, a final tightening operation is performed in the same manner as the temporary tightening operation described above, except that only the tightening torque of the motor is increased. With the above steps, removal of the sewing machine blade, installation of the sewing machine blade, temporary tightening, and final tightening are completed.

In addition, although the above-mentioned embodiment can perform both temporary tightening and final tightening of the bolt 14, the present invention is not limited to this example, and only one of them may be performed. For example, the tightening torque of the bolt 14 using the power wrench 40 may be set to the torque required for temporary tightening, and only the temporary tightening may be performed using the device of the present invention, and the final tightening may be performed using another device, or the blade holder may be used for the final tightening. If the insertion position of the sewing machine blade 3 by the sewing machine blade 30 can be accurately controlled, only the final tightening may be performed without performing the temporary tightening. Also,
Although a pneumatic cylinder is used as a means for moving the support member 26 up and down, any other means may be used instead, and furthermore, the support member 26 may be moved up and down manually. The blade holder 30 is also not limited to the structure shown in the drawings, and can be modified as appropriate. For example, one that uses vacuum suction instead of a magnet, or one that holds the sewing machine blade between suitable claws may be used.
However, when using claws that hold the sewing machine blade, it is necessary to provide a notch in the sewing machine barrel and sewing machine blade fixing device through which the claws can pass, so that the claws do not interfere with the sewing machine barrel and sewing machine blade fixing device. . The engagement between the bit 41 and the bolt 14 is not limited to the hexagonal section bit and hexagonal hole, and can be changed as appropriate, and a hole into which the bolt head fits may be formed on the bit side. Further, in the illustrated embodiment, the blade changing device 20 is incorporated into a rotary printing press, but the blade changing device 2
0 may be installed in a separate location from the rotary printing press, the sewing machine barrel whose sewing machine blade is to be replaced may be brought in, and the sewing machine blade may be replaced in the manner described above.

Effects of the Invention As explained above, the blade changing device of the present invention has the following features:
It is possible to remove the blade installed in the groove of the rotary processing cylinder, install a new blade, and tighten the bolt for fixing the blade to the specified torque, which previously required skill and took a long time. This has the advantage that blade replacement work can be performed extremely easily and in a short time.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of one embodiment of the present invention, FIG. 2 is a front view of the same, FIGS. 3 and 4 are sectional views of the main parts of the blade holder 30 and the sewing machine barrel 1, is blade holder 3
4 shows a state in which the blade holder 30 is brought closer to the sewing machine barrel 1. FIG.
FIG. 5 is a front sectional view of the blade holder 30, FIG. 6 is a perspective view of the sewing machine barrel 1 and receiver barrel 4, and FIGS. A top view and a cross-sectional view, and FIG. 9 are cross-sectional views showing a structure for fixing the sewing machine blade 3 to the groove 2 in a conventional sewing machine barrel. DESCRIPTION OF SYMBOLS 1... Sewing machine barrel, 2... Groove, 3... Sewing machine blade, 4... Receiving barrel, 11... Blade fixing device, 12... Blade holding block,
DESCRIPTION OF SYMBOLS 13... Wedge block, 14... Bolt, 20... Blade exchange device, 22... Frame, 26... Support member, 30... Blade holder, 40... Power wrench, 41... Bit, 42
...Motor, 43...Coupling.

Claims (1)

[Scope of Claims] 1. A groove extending in the longitudinal direction on the outer circumferential surface, a thin band-shaped blade mounted in the groove by being pressed against the side surface of the groove, and a blade extending in the depth direction of the groove for tightening or loosening the blade. A blade changing device used for exchanging the blade in a rotary machining cylinder having a plurality of bolts arranged therein, the blade changing device comprising: a pedestal; and a pedestal that is held by the pedestal and maintains a parallel state to the rotary machining cylinder; a support member movable toward and away from the cylinder; and a blade held by the support member so as to hold the blade parallel to the rotary processing cylinder and with the side surface of the blade parallel to the direction of movement of the support member. a holder; and a plurality of power wrenches held in the support member in correspondence with the plurality of bolts, each of the power wrenches engaging with and rotating a bolt head. A bit provided parallel to the moving direction of the support member, a motor for rotating the bit in both forward and reverse directions, means for controlling the tightening torque in the forward direction to a predetermined value, and The power wrench and the blade holder have a coupling ring that allows the power wrench to move backward in the direction, and the power wrench and the blade holder are such that when the support member approaches the rotary processing cylinder, the bit at the tip of each wrench engages with the bolt head. A blade changing device for a rotary machining cylinder, characterized in that the blade held by the blade holder is installed at a position where the blade is inserted into the groove.