JPH0431304B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing press, and in particular to a clamp base that is slidable in the direction of the dividing line of a plate cylinder, and a clamp that is coupled to the clamp base so as to be able to rise and fall. The present invention relates to a plate clamping device of a type in which a plate is provided in a plate cylinder groove, the plate edge is clamped by raising and lowering the clamp plate, and the plate is pulled by sliding a clamp base.

[Conventional technology]

In offset printing, a flexible metal plate, such as a plate made of aluminum or the like, which has been chemically treated according to the printing area and non-printing area, is attached to the outer periphery of the plate cylinder, and ink and dampening water are attached to the plate cylinder. is supplied to this plate and transferred to the blanket cylinder, and is further printed by applying pressure to the paper fed between the blanket cylinder and the impression cylinder. Therefore, the plate must be installed in the predetermined position specified by the plate punch system, etc., without causing local distortion, and in a state of appropriate tension, in close contact with the equicircular part of the plate cylinder. Must be. Therefore, a plate clamping device is provided in the plate cylinder groove to attach the plate to the plate cylinder. In order to ensure good printing quality, such a plate clamp device needs to properly hold the edge of the plate and apply appropriate tension to the entire plate. In addition, since plate changing time occupies a considerable proportion of printing preparation time, it is necessary to have excellent operability and operability in order to reduce plate mounting time.

Various techniques have been proposed for plate clamping devices. One example of these is the one disclosed in Japanese Utility Model Application Publication No. 60-32033. The outline of these conventional techniques will be explained with reference to FIGS. 1 to 4 as follows. That is, FIG. 1 is a side sectional explanatory view of a plate cylinder having a plate clamping device, FIG. 2 is a plan view showing a part of the plate clamping device in FIG. 1, and FIG. 3 is a sectional view taken along the line -- in FIG. , FIG. 4 is a sectional view taken along the line -- in FIG. 2.

In FIG. 1, a plate cylinder 1 rotating in the direction of arrow A
A plate cylinder groove 2 is formed in the axial direction (direction perpendicular to the drawing), and a balance weight 3 is located in the center of the plate cylinder groove 2, and a balance weight 3 is located at the center of the plate cylinder groove 2, and the plate 4 is placed on the gripping base side (indicated by reference numeral F). ) and the tail end side (indicated by the symbol R) are provided with a pair of almost similar plate clamping devices. Then, the plate 4 is clamped and pulled by these plate clamping devices, and is attached to the outer periphery of the equicircular portion 5 of the plate cylinder 1 in close contact.

Of these plate clamp devices, the one on the gripping base side F mainly plays the role of fixedly clamping the plate edge, while the one on the biting end side R not only clamps the plate edge but also pulls it. This often serves to bring the plate 4 into close contact with the equicircular portion 5 of the plate cylinder 1. Therefore, since the plate clamping device on the buttock side R is structurally a little more complicated, it is also illustrated in Figures 2 and below.

FIG. 2 shows the plate clamping device on the bottom side R in plan view, and the plate clamping device is arranged in two directions in the axial direction of the plate cylinder 1 (in the vertical direction of the drawing in FIG. 2) depending on the model. ~3 sets are often provided, so one of them is shown. 6 indicates a clamp base, and this clamp base 6 is
For example, the combination of the protrusions on the lower surface and the grooves (not shown) in the plate cylinder groove 2 allows it to slide in the direction of the dividing line of the plate cylinder 1 (the left-right direction in FIG. 2). Further, as best shown in FIG. 3, the clamp base 6 always loosens the plate 4 in the direction of the side wall 8 of the plate cylinder groove 2 by means of a spring 7 loaded between it and the side surface of the balance weight 3. biased in the direction. However, on the other hand, as best shown in FIG. 4, an adjustment bolt 9 is screwed onto the clamp base 6 in the direction of the dividing line, and the tip of the adjustment bolt 9 is in contact with the side wall 8. , by rotating the adjustment bolt 9, the clamp base 6 is rotated against the force of the spring 7.
can be freely slid in the direction of the dividing line. Note that 10 indicates an axial adjustment bolt of the clamp base 6.

The clamp plate 11 is coupled to the clamp base 6 so as to be able to rise and fall. That is, as best shown in FIG. 3, the clamp plate 11 is provided with a concave spherical mounting hole 12, and the hemispherical portion 14 on the lower surface of the head of the mounting bolt 13 is fitted into this mounting hole 12. By doing so, the clamp plate 11 can be raised and lowered relative to the clamp base 6. As best shown in FIG. 4, a plate spring 1 is provided between the upper surface of the clamp base 6 and the lower surface of the clamp plate 11.
5 is interposed, and this plate spring 1
5 constantly biases the clamp plate 11 in the opening direction with reference to the mounting bolt 13.

It is the clamp shaft 16 that opens and closes the clamp plate 11 against the elastic force of the plate spring 15, in other words, engages and releases the edge of the plate. The clamp shaft 16 is rotatably engaged between the clamp base 6 and the clamp plate 11 along the longitudinal direction of the clamp plate 11 and the like on the side opposite to the clamping portion of the plate 4.

As shown in FIG. 2, a clamp ring 17 is fixed to the clamp shaft 16, and a tool insertion hole 18 is provided in the clamp ring 17.
Further, as shown in FIG. 3, a part of the outer periphery of the clamp shaft 16 is cut out over the entire length (a notch 19). is pushing up the bottom surface of the clamp plate 11, so the plate sling 15
Despite this force, the clamp plate 11 closes and clamps the edge of the plate. However, if the clamp shaft 16 is rotated approximately 90 degrees clockwise from the state shown in FIG.
When the lower end of the clamp plate 11 falls into the notch 19, the clamp plate 11 is opened counterclockwise by the elastic force of the plate spring 15.
The edge of the plate will be opened.

In addition, in FIGS. 3 and 4, in order to clearly show the spring 7 and plate spring 15, respectively, these members 7 and 15 are shown so as to be exactly in the cross section.

To summarize the above, in the conventional plate clamping device, in order to clamp the plate, the clamp shaft having a notch is rotated to raise and lower the clamp plate, and in order to pull the plate, it touches the side wall. The clamp base was supposed to slide by threading the adjoining adjustment bolt.

Therefore, in conventional plate clamping devices, the adjustment bolts have to be screwed in a large number of cramped locations, and the clamp base cannot slide smoothly and uniformly, resulting in poor operability. was.

In addition, since the operation for holding the plate and the operation for pulling the plate are completely separated,
These operations were time-consuming and required a long time to change the version.

Furthermore, since the configurations for performing both operations were completely different, the structure was complicated.

[Problem that the invention seeks to solve]

Therefore, the main object of the invention is to obtain an improved plate clamping device.

Another object of the present invention is to provide a plate clamping device that has good operability and can pull the plate smoothly and uniformly over its entire width.

Another object of the present invention is to obtain a plate clamping device that has good operability and can minimize plate change time.

Still another object of the present invention is to obtain a plate clamping device with a simple structure.

In order to achieve these objects, the present invention provides a clamp shaft rotatably engaged between a clamp base and a clamp plate, a first cam portion related to the undulation of the clamp plate, and a sliding movement of the clamp base. and a second cam portion related to the second cam portion.

Further, in the present invention, the second cam portion slides the clamp base via a member that slides with the clamp base, and furthermore, this sliding member is adjustable, so that the clamp base The amount of sliding is adjusted.

Further, the present invention provides an adjustment base that is pressed in the direction of the dividing line by the second cam, an adjustment bolt that is threadedly engaged with the adjustment base and whose screwing amount is variable, and an adjustment base that is rotated in the direction of rotation with the adjustment base. and an adjustment ring that is integral with the body and allows sliding in the direction of the secant line.

Therefore, according to the plate clamping device according to the present invention, since the clamp base is also slid in the axial direction by one clamp shaft, the plate can be pulled smoothly and uniformly over the entire width. .

Further, according to the device of the present invention, the clamping operation and the pulling operation of the plate are performed by continuous rotation of the clamp shaft, so that the operability is extremely good and the time for changing the plate can be minimized.

Further, according to the device of the present invention, the clamping and tensioning of the plate are realized integrally by a mechanism centered around one clamp shaft, so the structure is simple.

Moreover, according to the device of the present invention, the amount of sliding of the clamp base can be adjusted simply by turning the adjustment ring, so that the tensile force of the plate can be optimized.

〔Example〕

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

FIG. 5 is a plan view showing an embodiment of the plate clamping device according to the present invention, FIG. 6 is a cross-sectional view taken along the line -- in FIG. 5, FIG. 7 is a cross-sectional view taken along the line -- in FIG. 5, and FIG. , b, and c are cross-sectional views taken along the line -- in FIG. 5, FIGS. 9a, b, and c are cross-sectional views taken along the line -- in FIG. 5, and FIG. 10 is an exploded perspective view of the members constituting the adjusting means.

In FIG. 5, a clamp base 20 is provided within the plate cylinder groove 2 so as to be slidable in the direction of the dividing line of the plate cylinder 1. As shown in FIG. This clamp base 20 is one in the axial direction of the plate cylinder 1 (vertical direction in FIG. 5),
Therefore, FIG. 5 representatively shows several pieces on the end R side of a long plate clamp device depending on the model. As explained in the prior art section,
The clamp base 20 is slidable in the direction of the dividing line of the plate cylinder 1 by a known combination of a protrusion on its lower surface and a concave groove (not shown) in the plate cylinder groove 2.
In addition, a spring 7 elastically loaded between the side surface of the balance weight 3 at the center of the plate cylinder groove 2 constantly moves the plate 4 in the direction of the side wall 8 of the plate cylinder groove 2 (in the right direction in FIG. 5, (This is the direction of loosening.) Note that 10 indicates an axial adjustment bolt of the clamp base 20, similar to the prior art.

Several clamp plates 21 are placed corresponding to the clamp base 20. These clamp plates 21, like those of the prior art, have concave mounting holes 12, best shown in FIG. 6, and have mounting bolts 13 (as shown in FIG.
Approximately three clamp plates 21 are used for each book. ) is connected to the clamp base 20 by aligning the hemispherical part 14 on the lower surface of the head with this mounting hole 12. Therefore, the clamp plate 21 is
Based on the mounting bolt 13, it can be raised and lowered to engage/release the edge of the plate. As best shown in FIG. 7, a horseshoe-shaped plate spring 15 is interposed between the upper surface of the clamp base 20 and the lower surface of the clamp plate 21, and the elastic force of the plate spring 15 , the clamp plate 21 is constantly biased in the opening direction (counterclockwise in FIG. 7).

It should be noted that the clamp shaft 23 rotatably engaged between the semicircular groove 22 of the clamp plate 20 and the lower surface of the clamp plate 21 is completely different from that of the prior art. In other words, the clamp shaft 23 has the function of not only raising and lowering the clamp plate 21 but also sliding the clamp base 20 by its rotation.

As shown in FIG. 6, a part of the outer periphery of the clamp shaft 23 is cut out in the longitudinal direction to form a notch 24, and the lower rear end of the clamp plate 21 can be received in the notch 24. It's getting old. When the lower rear end of the clamp plate 21 is received in this notch 24 (see FIG. 8a), the clamping end of the clamp plate 21 is opened and the plate end is released. As shown in FIGS. 6 and 8b, the outer peripheral surface of the clamp shaft 23 connects the clamp plate 21 to the plate spring 1.
When pushed up against the elastic force of 5, the clamp plate 21 is closed and the edge of the plate is clamped. In other words, the notch 24 of the clamp shaft 23 and the outer peripheral surface constitute a first cam portion that is related to the ups and downs of the clamp plate 21.

Now, if the clamp shaft 23 is only involved in the ups and downs of the clamp plate 21, its role will be small compared to the space occupied by the clamp shaft 23, and as shown in FIGS. 8a, b, and c, The clamp shaft 23 is rotated simply by inserting a completely simple shaped tool 26 into the tool insertion hole 25.
is much easier to rotate than the adjustment bolt 9 of the prior art, which is screwed in a narrow space, and in addition, the clamp shaft 23 extends in the axial direction of the plate cylinder 1. By clamp base 20
The first feature of the present invention is that the clamp shaft 23 is also involved in the sliding operation of the clamp base 20 since the clamp shaft 23 can apply force evenly over the entire clamp base 20.

That is, several locations in the longitudinal direction of the clamp shaft 23 (only one location is shown in FIG. 5, but there may be several locations depending on the model or plate width).
The partial cams 27 best shown in FIGS. 9a, b, and c are engaged, and these partial cams 27
is the second cam portion that is related to the sliding movement of the clamp base 20, in other words, the tension of the plate 4.

In response to the partial cam 27, members that slide in the direction of the dividing line, namely the adjustment base 28 and the adjustment bolt 29
are provided at numerous locations on the clamp base 20,
The tip of the adjustment bolt 29 is in contact with the side wall 8.
The function of the partial cam 27 is exerted through the adjustment base 28 and adjustment bolt 29 that are integrated with each other. To be more specific, FIG. 9 a, b, and c are as follows.
8a, b, and c, respectively, in which the rear lower end of the clamp plate 21 is received in the notch 24, and therefore the clamp plate 21 is in the open state (FIG. 9 a) and the clamp shaft 23 In the state in which the clamp plate 21 is pushed up by the outer periphery of the (FIG. 9b), the partial cam 27 is pushed up against the adjustment base 28.
Therefore, no force is generated to cause the clamp base 20 to slide. (At this time, the clamp base 20 is pressed in the direction of the side wall 8 by the spring 7, as described above.) However, if the clamp shaft 23 is subsequently rotated from the state shown in FIG. 9b, When proceeding to the state shown in FIG.
is pressed to transmit force to the adjustment bolt 29 that is integrated with this. As a result, the tip of the adjustment bolt 29 presses the side wall 8, and as a reaction to this, the clamp base 20 resists the elastic force of the spring 7 and moves integrally with the clamp shaft 23 itself and the clamp plate 21 in the secant direction (Fig. 9). c) to the left, and plate 4
It pulls.

In this way, the partial cam 27 does not have any effect when the plate 4 is opened and clamped, and only acts after it is further rotated after clamping. The pressing force acts on the side wall 8 via the adjustment base 28 and the adjustment bolt 29 that slide against the clamp base 20, and causes the clamp base 20 to slide as a reaction.

Clamp shaft 23 having first and second cam parts
Only one is required in the axial direction of the plate cylinder 1, and in cooperation with the partial cams 27, adjustment base 28, etc. provided at many locations, the entire plate clamp device can slide smoothly and uniformly. .

In addition, both the gripping and pulling operations of the plate 4 can be performed continuously by a simple operation of inserting a tool 26 of a simple shape into a tool insertion hole 25 preferably provided in the center portion and turning it. It can be carried out quickly.

Furthermore, as shown in FIG. 8, a stopper 30 restricts the rotation range of the clamp shaft 23 (in the case of FIG. In the case of FIG. c, there is a limit (indicating a limit at which the clamp base 20 does not slide any further), so that the above operation can be completed reliably and without error.

By the way, in order to uniformly and properly pull the plate 4 into close contact with the plate 4, which is wide in the axial direction of the plate cylinder 1, without causing local distortion, the clamp plate 21 must hold the edge of the plate. It is known from experience that the amount of sliding of the clamp base 20, in other words, the degree of pulling of the plate 4, must be adjustable at various points in the longitudinal direction of the clamp base 20, as well as ensuring secure grip. This is where I am. Further, such an adjustment function is required due to machine manufacturing considerations.

In order to make such adjustment possible, since the rotation of the clamp shaft 23 is uniform and simultaneous for a large number of adjustment bases 28, etc., the rotation of the clamp shaft 23 is uniform and simultaneous. It is necessary to add some ingenuity to the members that are acted upon by the cam section. A second feature of the present invention is that the member that slides against the clamp base 20 in order to slide the clamp base 20 is adjustable, so that the amount of sliding of the clamp base 20 can be adjusted at various points in the longitudinal direction. In addition, an adjustment means is provided which allows the clamp base 20 to be adjusted by slightly tilting it clockwise or counterclockwise as shown in FIG. 5, for example.

More specifically, as shown in FIGS. 9 and 10, the adjustment base 28, which receives force at one end from the partial cam 27 of the clamp shaft 23, is slidable in the guide hole 31 of the clamp base 20 in the direction of the split line. They are fitted, and a screw hole 32 is provided inside. An adjustment bolt 29 having a thread cut on its outer periphery is screwed into this screw hole 32. Therefore, the adjustment base 28 and adjustment bolt 2 are integrated.
By changing the amount of screwing 9, the total length from the end of the adjustment base 28 on the partial cam 27 side to the end of the adjustment bolt 29 on the side wall 8 side can be changed. As a result, even if the clamp shaft 23 itself acts uniformly in the longitudinal direction (the plate width direction) of the clamp base 20, the partial cam 2 exerts an effect on the adjustment base 28 etc. provided at various locations on the clamp base 20.
You can make the sound of 7 different,
As a result, the amount of sliding of the clamp base 20 can also be finely adjusted.

In order to easily and quickly change the setting of the screwing amount of the adjusting base 28 and the adjusting bolt 29 constituting the adjusting means, it is preferable to keep one of them unrotatable. Therefore, as best shown in Figure 10,
Two flat surfaces 33 are formed on the side surfaces of the adjustment bolt 29 in parallel along the sliding direction. These flat portions 33 are sandwiched between rotation prevention plates 34. This anti-rotation plate 34
is fixed to the side surface of the clamp base 20 by a set screw 35.

Alternatively, the adjustment base 28 may be directly rotated with respect to the adjustment bolt 29, which cannot be rotated, but this is inconvenient for work, and the amount of adjustment cannot be confirmed. It becomes a task that depends on your skill.

Therefore, as shown in FIG.
A hexagonal portion 36 is formed along the sliding direction on the outer periphery of the adjustment ring 37, and this hexagonal portion 36 fits into a hexagonal hole 38 at the center of the adjustment ring 37. Therefore, although the adjustment base 28 and the adjustment ring 37 are allowed to slide relative to each other, they rotate as one. Therefore, when the adjustment base 28 slides relative to the clamp base 20 by the partial cam 27 of the clamp shaft 23, the adjustment ring 37 does not interfere in any way, but when the adjustment ring 37 is rotated, the adjustment The base body 28 also rotates together, and the amount of screw engagement with the adjustment bolt 29 changes.

The third feature of the present invention is the adjustment ring 37 that rotates the adjustment base 28, and as described above, the adjustment ring 37 rotates together with the adjustment base 28 while allowing mutual sliding. As shown in FIG. 5, the outer periphery is exposed to the outside through the square hole 39 of the clamp plate 21. A scale 40 is provided on the outer periphery of the adjustment ring 37, so that the amount of adjustment can be visually recognized immediately and quantitatively. In addition, tool insertion holes 41 are bored at multiple locations on the outer periphery so that the tool can be easily rotated with a completely simple tool similar to the tool 26 shown in FIG.
Therefore, by rotating the tool inserted into the tool insertion hole 41 while visually checking the scale 40 on the adjustment ring 37 peeking through the square hole 39, the adjustment base 2
8 is also rotated together, and at this time, the amount of screw engagement with the adjustment bolt 29, which is held unrotatably, is also changed.
As a result, the amount of sliding at any location of the clamp base 20 can be easily adjusted.

[Brief explanation of drawings]

Figures 1 to 4 show the prior art;
The figure is a side sectional explanatory view of a plate cylinder having a plate clamping device, FIG. 2 is a plan view showing a part of the plate clamping device in FIG. 1, FIG. is a sectional view taken along the line in FIG. Also, the fifth
The figures to FIG. 10 show an embodiment of the present invention,
Fig. 5 is a plan view of the plate clamping device, and Fig. 6 is a plan view of the plate clamping device.
Figure 7 is a sectional view taken along the - line in Figure 5. Figure 8 a, b, and c are sectional views taken along the - line in Figure 5. Figure 9 a, b, and c are sectional views taken in Figure 5. FIG. 10 is an exploded perspective view of the members constituting the adjustment means. 1... Plate cylinder, 2... Plate cylinder groove, 3... Balance weight, 4... Plate, 7... Spring, 8... Side wall, 12... Mounting hole, 13... Mounting bolt, 14
... Hemispherical part, 15 ... Plate spring, 2
0... Clamp base, 21... Clamp plate, 22... Semicircular groove, 23... Clamp shaft, 2
4... Notch, 25... Tool insertion hole, 26...
Tool, 27... Partial cam, 28... Adjustment base, 2
9...adjustment bolt, 30...stopper, 31...
Guide hole, 32... Screw hole, 33... Flat part, 3
4... Anti-rotation plate, 36... Hexagonal part, 3
7... Adjustment ring, 38... Hexagonal hole, 39... Square hole, 40... Scale, 41... Tool insertion hole.

Claims (1)

[Scope of Claims] 1. A clamp base slidable in the direction of the dividing line of the plate cylinder, and a clamp plate connected to the clamp base so as to be able to rise and fall, are provided in the plate cylinder groove, and the clamp plate is raised and lowered. In a plate clamping device for a printing press in which the edge of the plate is clamped by the plate and the plate is pulled by sliding the clamp base, there is provided a rotatable member between the clamp base and the clamp plate. The suspended clamp shaft has a first cam part that is related to the undulation of the clamp plate and a second cam part that is related to the sliding movement of the clamp base. 2. The plate clamping device according to claim 1, wherein the first cam portion of the clamp shaft is constituted by a notch portion of the clamp shaft and an outer circumferential surface. 3. The plate clamping device according to claim 1, wherein the second cam portion of the clamp shaft is formed partially in the longitudinal direction of the clamp shaft. 4. In the plate clamping device according to claim 1, the clamp shaft is 1 with respect to the axial direction of the plate cylinder.
Something characterized by being a book. 5. The plate clamp device according to claim 1, characterized in that a stopper is provided for regulating the rotation range of the clamp shaft. 6. The plate clamp device according to claim 1, characterized in that the clamp shaft has a hole for inserting a tool. 7. The plate clamping device according to claim 1, wherein the second cam portion of the clamp shaft slides the clamp base via a member that slides against the clamp base. 8 A clamp base that can slide in the direction of the dividing line of the plate cylinder, and a clamp plate that is coupled to the clamp base so that it can be raised and lowered are provided in the plate cylinder groove, and by raising and lowering the clamp plate, the edge of the plate can be adjusted. In a printing press plate clamping device of the type that clamps the plate and pulls the plate by sliding the clamp base, a clamp shaft is rotatably suspended between the clamp base and the clamp plate. , has a first cam part that is related to the ups and downs of the clamp plate, and a second cam part that is related to the sliding of the clamp base, and the second cam part is connected to the clamp base through a member that slides with respect to the clamp base. The clamp base is slidable by the clamp base, and this sliding member is adjustable, thereby adjusting the amount of sliding of the clamp base. 9. The plate clamp device according to claim 8, characterized in that the length of the sliding member is adjustable. 10 In the plate clamping device according to claim 9, the sliding member is composed of a plurality of mutually screwed members, and one of these members is rotatable while the other is rotated. The length is adjusted by rotating the member. 11. In the plate clamping device according to claim 10, the plate clamping device includes a member that is integral with the member that is rotated for length adjustment only in the rotational direction, and that allows mutual sliding in the direction of the dividing line. The length is adjusted by engaging the two members and rotating the other member. 12. A clamp base that is slidable in the direction of the dividing line of the plate cylinder, and a clamp plate that is engaged with the clamp base so as to be able to rise and fall, are provided in the plate cylinder groove,
In a plate clamping device for a printing press, the plate edge is clamped by undulating the clamp plate, and the plate is pulled by sliding the clamp base, wherein the clamp base and the clamp plate are A clamp shaft rotatably engaged between the clamp shaft has a first cam part that is related to the undulation of the clamp plate, and a second cam part that is related to the sliding movement of the clamp base; The cam part slides the clamp base via a member that slides with the clamp base, and the sliding member is adjustable, and an adjustment base that is pressed in the secant direction by the second cam. an adjustment bolt that is screwed into the adjustment base and whose screwing amount is variable; and an adjustment ring that is integral with the adjustment base only in the rotational direction and allows sliding in the secant direction. Something. 13. The plate clamp device according to claim 12, characterized in that the adjustment ring is provided with a scale. 14. The plate clamping device according to claim 12, characterized in that the adjustment ring has a hole for inserting a tool.