JP2000130538A - Cam mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cam mechanism switchable in a short time at a low cost. SOLUTION: This cam mechanism is provided with a cam holder 3 turnably supported and having projection parts 3a, 3b on its outer peripheral surface; a ring-like cam 4 installed to the cam holder 3 and having the outer peripheral surface of specific geometry; a cam follower 15 rolling on the outer peripheral surface of the cam 4; a link plate, a lever 10, an air cylinder 13, etc., connected to the projection part 3b of the cam holder 3 to turn the cam holder 3 by the expansion and contraction; a first stopper 6 for regulating the turning movement of the cam 4 to one side caused by the expansion of the air cylinder 13; a second stopper 14 for regulating the turning movement of the cam 4 to the other side caused by the contraction of the air cylinder 13; and a third stopper 5 for energizing the projection part 3a of the cam holder 3, whose turning movement to the other side is regulated by the second stopper 14, to the turning direction regulated by the second stopper 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cam mechanism,
In particular, the present invention is effective when applied to a case where the operation timing of various operating tools provided in a cylinder of a folding machine of a printing press can be switched.

[0002]

2. Description of the Related Art In a folding machine attached to a printing press, each cylinder (body) provided with operating tools such as grippers, knives, and needles for transferring, cutting, and bending a printed web is provided. A cam mechanism for periodically operating the actuator is provided. An example of this conventional cam mechanism (for example, Japanese Utility Model Publication No. 7-56283) is shown in FIGS.
Shown in

As shown in FIGS. 5 and 6, a frame 101 for rotatably supporting one end of a cylinder 102 has an annular cam holder 10 having a gear portion 103a formed on an outer peripheral surface.
3 is rotatably provided coaxially with the cylinder 102. An annular cam 104 having an outer peripheral surface of a predetermined shape is attached to the cam holder 103. That is, by rotating the cam holder 103, the cam 104 can be rotated.

A cam holder 10 is mounted on the frame 101.
3, a pinion gear 105 that meshes with the gear portion 103a.
Are rotatably supported. This pinion gear 105
Is connected to a rotary actuator 106 fixedly supported by the frame 101. That is, by driving the rotary actuator 106 to rotate the pinion gear 105, the cam holder 103 can be rotated.

A pair of stopper pins 107a and 107b are provided on the cam holder 103 at predetermined intervals in a circumferential direction of the cam holder 103. The frame 101 is provided with the stopper pins 107a and 107b.
And a stopper plate 108 that can be engaged with the stopper plate 108. That is, when the cam holder 103 is rotated to one side, the one stopper pin 10
7a can be engaged to restrict the rotation of the cam holder 103 to one side, and when the cam holder 103 is rotated to the other side, the other stopper pin 107b engages with the stopper plate 108 and the other side of the cam holder 103 Rotation can be regulated.

A cam holder 10 is mounted on the frame 101.
A plurality (two in this example) of clamp devices 109 for clamping the frame 3 to the frame 101 is provided. On the other hand, the outer peripheral surface (cam surface) of the cam 104 is provided on one end surface of the cylinder 102 so that the roller type cam follower 110 can roll along the outer peripheral surface (cam surface) of the cam 104.
It is rotatably supported while being biased toward.

In such a cam mechanism, the cam holder 103 is unclamped by operating the clamp device 109, and the rotary actuator 106 is operated via the pinion gear 105 until the stopper pin 107a engages with the stopper plate 108. When the cam holder 103 is rotated to one side, the clamp device 109 is operated to clamp the cam holder 103, and then the cylinder 102 is rotated. As the cylinder 102 rotates, the cam follower 110 rolls along the outer peripheral surface of the cam 104. Moving, cam 10
By moving in the radial direction of the cylinder 102 in accordance with the shape of 4, the operating tool can be operated at a predetermined cycle in conjunction with the radial movement of the cam 104.

Here, the cam holder 103 is unclamped by operating the clamp device 109, and the cam holder 103 is moved via the pinion gear 105 to the other side until the stopper pin 107b is engaged with the stopper plate 108 by operating the rotary actuator 106. When the cam holder 103 is clamped by operating the clamp device 109, the circumferential position of the cam 104 is changed, and the moving cycle of the cam follower 110 in the radial direction is shifted. Can be switched.

[0009]

The above-described conventional cam mechanism has the following problems. Rotary actuator 106 and clamp device 109
Since a plurality of operating devices such as the above are used, the cost increases. Since the clamp device 109 is operated to be in the unclamped state, and then the rotary actuator 106 is operated, and then the clamp device 109 is operated again to be in the clamped state, many operations are required for switching, and the switching takes time.

Accordingly, an object of the present invention is to provide a cam mechanism which is inexpensive and requires a short switching time.

[0011]

According to the present invention, there is provided a cam mechanism, comprising: a cam member movably supported; and a driving force transmitting means connected to the cam member for transmitting a driving force. Means, fluid pressure driving means coupled to the driving force transmitting means for moving the cam member to one side or the other side via the driving force transmitting means, and restricting movement of the cam member to the one side. A first regulating member abutting on the cam member, and a second regulating member abutting on the fluid pressure driving means side of the driving force transmitting means to regulate the movement of the cam member to the other side. And a biasing unit that abuts on the cam member whose movement to the other side is regulated by the second regulating member, and biases the cam member toward the one side. I do.

In the above-described cam mechanism, the driving force transmitting means is rotatably supported at one end by a link plate rotatably connected to the cam member, and is rotatably supported at one end by the other end of the link plate. And a lever whose other end is connected to the fluid pressure driving means, and the connection center position of the link plate and the lever is adjusted during rotation of the cam member. It is set so as to pass through a line connecting a connection center between the cam member and the link plate and a rotation center of the lever.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a cam mechanism according to the present invention is applied to a cylinder (barrel) of a folding machine attached to a printing press will be described with reference to FIGS. FIG. 1 is a schematic configuration diagram of a main part thereof, FIG. 2 is a developed sectional view of FIG.
FIG. 4 is an operation explanatory view of the third stopper, and FIG. 4 is an operation explanatory view of a connecting portion between the link plate and the lever.

As shown in FIGS. 1 and 2, a cam holder 3 having protruding portions 3a and 3b on its outer peripheral surface is rotatably coaxially mounted on a frame 1 for rotatably supporting one end of a cylinder 2. It is provided in. A circular (ring) -shaped cam 4 forming an outer peripheral surface (cam surface) of a predetermined shape is attached to the cam holder 3. That is, by rotating the cam holder 3, the cam 4 can be rotated.

A third stopper 5 and a first stopper 6 are mounted on the frame 1 with a projecting portion 3a of the cam holder 3 interposed therebetween. As shown in FIG. 3, the third stopper 5 has a head 5aa at the base end and a bolt 5a having a thread 5ab at the distal end.
And a support 5b for supporting the bolt 5a slidably in the axial direction, a nut 5c to be screwed to the external thread portion 5ab of the bolt 5a, and interposed between the support 5b and the nut 5c. And a compression coil spring 5e which is loosely fitted to the bolt 5a.

That is, when the third stopper 5 is pushed so that the protrusion 3a of the cam holder 3 comes into contact with the tip of the bolt 5a, the bolt 5a is moved so that the head 5aa of the bolt 5a is separated from the support 5b. At the same time as sliding with respect to the support 5b (see FIG. 3B), the compression coil spring 5e pushes the projection 3a via the washer 5d, the nut 5c, and the bolt 5a so as to push back the projection 3a of the cam holder 3. It is urged (see FIG. 3C).

One end of a link plate 8 is rotatably connected to the protruding portion 3 b of the cam holder 3 via a pin 7. One end of an L-shaped lever 10 is rotatably connected to the other end of the link plate 8 via a pin 9. The vicinity of a corner portion of the lever 10 is rotatably supported on the frame 1 by a shaft 11. To the other end of the lever 10, the tip of a rod 13 a of an air cylinder 13 is rotatably connected via a pin 12. The base end of the air cylinder 13 is supported by the frame 1, and the axis of the pin 9 is located within a predetermined range across a line connecting the axis of the pin 7 and the axis of the shaft 11. When, that is,
Before and after the dead point position P _d of the pin 7 shown in FIG. 4 position P _b, P _a
The base end position, the stroke length of the rod 13a, and the like are set so that the protruding portion 3a of the cam holder 3 is brought into contact with the distal end of the bolt 5a of the third stopper 5 when the axis of the pin 9 is positioned between them. ing.

In the vicinity of the lever 10 of the frame 1, a second stopper 14 for regulating the rotation of the lever 10 in the contraction direction of the rod 13a of the air cylinder 13 is provided. State the second stopper 14, the cam holder 3 and the lever 10 in the direction of shifting to the contracted state rod 13a of the air cylinder 13 from the extended state when the rotated, the pin 9 passes through the dead point position P _d And the projection 3a of the cam holder 3 is the compression coil spring 5e of the third stopper 5.
The position is set so as to be in a state of being urged to be pushed back by (see FIG. 3C).

That is, the rod 13a of the air cylinder 13
When the cam holder 3 is extended, the cam holder 3 rotates to one side via the lever 10 and the link plate 8 (clockwise in FIG. 1), and the first stopper 6 projects the protrusion 3a of the cam holder 3.
The rotation of the cam 4 in this direction is restricted by the contact of the cam 4.

On the other hand, when the rod 13a of the air cylinder 13 is contracted, the cam holder 3 rotates to the other side via the lever 10 and the link plate 8 (counterclockwise in FIG. 1), and as shown in FIG. , The pin 9 is at the dead center position P _d
In position P _b before reaching the protrusion 3a of the cam holder 3
Abuts against the tip of the bolt 5a of the third stopper 5 (FIG. 3).
(A) refer), when the pin 9 is further rotated the cam holder 3 has reached the dead center position P _d, shrink press strongest protrusion 3a of the cam holder 3 and compression coil spring 5e of the third stopper 5 (see FIG. 3 (b)), at position P _a after the pin 9 passes through the dead point position P _d, the second stopper 14 restricts the rotation of in the direction of the cam 4 abuts on the lever 10 At the same time, the compression coil spring 5e of the third stopper 5 is pushed back (see FIG. 3C), and the lever 10 is moved through the second stopper 14 via the cam holder 3, the link plate 8, and the like.
The projection 3a of the cam holder 3a is urged toward the one side so as to press the cam holder 3a.

An outer peripheral surface (cam surface) of the cam 4 is provided on one end surface of the cylinder 2 so that a roller type cam follower 15 can roll along the outer peripheral surface (cam surface) of the cam 4.
It is rotatably supported while being biased toward.

In the present embodiment, the cam holder 3,
A cam member is constituted by the cam 4 and the like, a driving force transmitting means is constituted by the pins 7, 9, the link plate 8, the lever 10, the shaft 11, and the like, and a fluid pressure driving means is constituted by the pin 12, the air cylinder 13 and the like. The third stopper 5 and the like constitute urging means, the first stopper 6 and the like constitute a first regulating member, and the second stopper 14 and the like constitute a second regulating member.

In such a cam mechanism, by extending the rod 13a of the air cylinder 13, the cam holder 3 rotates to one side via the lever 10 and the link plate 8 (clockwise in FIG. 1). Direction), the protruding portion 3a of the cam holder 3 comes into contact with the first stopper 6, and the rotation of the cam 4 in that direction is restricted. In this state, cylinder 2
Is rotated, the cam follower 15 rolls along the outer peripheral surface of the cam 4 with the rotation of the cylinder 2, and moves in the radial direction of the cylinder 2 according to the shape of the cam 4. The operating tool operates at a predetermined cycle in conjunction with the movement in the direction.

Here, the force to the one side by the pressing force of the air cylinder 13 and the first stopper 6 are applied to the cam holder 3.
Since the reaction force against this force acts on the link plate 8, it is possible to prevent rattling of the link plate 8 and the connecting portion of the lever 10.

For this reason, when the cam follower 15 climbs the cam ridge of the cam 4, the force in the rotation direction of the cylinder 2 acts on the cam holder 3, but the first stopper 6 rotates the cam holder 3 to the one side. On the other hand, when the cam follower 15 descends the cam ridge of the cam 4, the force in the direction opposite to the rotation of the cylinder 2 acts on the cam holder 3 (the force is much smaller than the force acting when climbing the cam ridge). ) Since the first stopper 6 regulates the rotation of the cam holder 3 to the one side and does not cause backlash at the connecting portion as described above, the cam follower 15 can operate accurately at a predetermined cycle. it can.

On the other hand, when the rod 13a of the air cylinder 13 is contracted, the cam holder 3 rotates to the other side via the lever 10 and the link plate 8 (see FIG. 1).
In the counterclockwise direction), as described above, the lever 10 comes into contact with the second stopper 14 to restrict the rotation of the cam 4 in this direction, and at the same time, the cam holder 3
Of the compression coil spring 5e, and the lever 10 is pressed against the second stopper 14 via the link plate 8 or the like.

When the cylinder 2 is rotated in this state, the cam follower 15 rolls along the outer peripheral surface of the cam 4 with the rotation of the cylinder 2, and the cylinder follower 15 moves in accordance with the shape of the cam 4.
By moving in the radial direction, the operating tool operates in a predetermined cycle in conjunction with the radial movement of the cam 4.

Here, since a force to the one side by the urging force of the compression coil spring 5e of the third stopper 5 and a reaction force to the force by the second stopper 14 are acting on the cam holder 3, the link is provided. It is possible to prevent rattling of the connecting portion of the plate 8 and the lever 10 and the like.

For this reason, when the cam follower 15 climbs the cam ridge of the cam 4, the force in the rotation direction of the cylinder 2 acts on the cam holder 3, but the second stopper 14 rotates the cam holder 3 to the one side. On the other hand, when the cam follower 15 descends the cam ridge of the cam 4, the force in the direction opposite to the rotation of the cylinder 2 acts on the cam holder 3 (the force is much smaller than the force acting when climbing the cam ridge). ), Since the third stopper 5 regulates the rotation of the cam holder 3 to the one side and does not rattle at the connecting portion as described above, the cam follower 15 can operate accurately at a predetermined cycle. it can.

Therefore, according to such a cam mechanism, the following effects can be obtained. Since only the air cylinder 13 is required for the operating device, the cost can be reduced. Since the switching can be performed only by the expansion and contraction operation of the air cylinder 13, the time required for the switching can be reduced.

In this embodiment, the air cylinder 1
When the air cylinder 13 is contracted, the cam 4 is turned to one side when the air cylinder 13 is contracted, and the cam 4 is turned to the other side when the air cylinder 13 is contracted. So that the cam 4 is rotated to one side.
It is also possible to rotate the cam 4 to the other side when the air cylinder 13 is extended.

In this embodiment, the air cylinder 13 is used as the fluid pressure driving means.
For example, an air motor or the like can be applied.

In this embodiment, the case where the present invention is applied to a cylinder of a folding machine of a printing press has been described. However, the present invention is not limited to this. For example, a reversing switching mechanism of a reversing machine of a printing press,
The present invention can also be applied to the operation switching portion of the suction pad.

[0034]

According to the cam mechanism of the present invention, the operation cycle timing can be switched only by the expansion / contraction drive means, so that the time required for the switching can be reduced at low cost.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a main part of an embodiment in which a cam mechanism according to the present invention is applied to a cylinder (body) of a folding machine attached to a printing press.

FIG. 2 is an expanded sectional view of FIG.

FIG. 3 is an operation explanatory view of a third stopper.

FIG. 4 is an operation explanatory view of a connecting portion between a link plate and a lever.

FIG. 5 is a schematic configuration diagram of a main part of an example of a conventional cam mechanism applied to a cylinder (body) of a folding machine attached to a printing press.

FIG. 6 is a developed sectional view of FIG. 5;

[Explanation of symbols]

 Reference Signs List 1 frame 2 cylinder 3 cam holder 3a, 3b protrusion 4 cam 5 third stopper 5a bolt 5aa head 5ab male thread 5b support 5c nut 5d washer 5e compression coil spring 6 first stopper 7, 9, 12 pin 8 link plate Reference Signs List 10 lever 11 shaft 13 air cylinder 13a rod 14 second stopper 15 cam follower

Claims (2)

[Claims] A cam member movably supported; a driving force transmitting means connected to the cam member for transmitting driving force; a driving force transmitting means connected to the driving force transmitting means, and via the driving force transmitting means. A fluid pressure driving unit that moves the cam member to one side or the other side; a first regulating member that contacts the cam member so as to regulate the movement of the cam member to the one side; A second regulating member abutting on the fluid pressure driving means side of the driving force transmitting means so as to regulate the movement to the other side; and the cam regulated by the second regulating member from movement to the other side. And a biasing means for abutting against the member and biasing the cam member toward the one side. 2. A link plate having one end rotatably connected to the cam member, the driving force transmitting means being rotatably supported, and one end rotating to the other end of the link plate. And a lever whose other end is connected to the fluid pressure driving means, wherein the link center position between the link plate and the lever is set to the cam member during rotation of the cam member. The cam mechanism according to claim 1, wherein the cam mechanism is set so as to pass through a line connecting a connection center of the link plate and a rotation center of the lever.