JPH08192509A - Cam transmission gear having periodically rotating follower link - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute a cam transmission in a strong (rigid) structure for saving a structural space to accelerate a maximum rotational speed in the transmission having a periodically rotating driven cam in a machine or particularly a printer. SOLUTION: A support point A0 of a drive link 1 and a support point B0 of a driven link 2 are disposed in curve passages X1 to X3 drawn by rotation of the drive link at a contact point of a cam profiles K1 to K3 of the link 1 with cam rollers R1 to R3 of the link 2 in a projection to a flat surface formed of the link 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cam transmission device having a periodically rotating driven link in a processing machine, particularly a printing machine.

[0002]

BACKGROUND OF THE INVENTION In machine tools, it is often necessary to convert rotary drive movements into continuous movements which periodically vary by an average value or into continuous movements with pauses or momentary stoppages. Circular table machines require such movement, for example to drive a table. In a sheet paper (cut sheet) printing machine, in order to accelerate a stationary sheet paper to an impression cylinder speed, periodically at a speed that changes by an average value or at a speed that changes between a pause and a maximum value. A rotating sheet paper acceleration drum is utilized.

Crank gears, Maltese cross gears, differential gears in machine tools for converting rotary drive movements into continuous movements that periodically fluctuate by an average value or into continuous movements with rest or momentary stoppage. Planetary gearing,
Cam or worm gears are used. It has been found to be particularly advantageous to utilize a flat cam drive in a printing press, especially when driving a sheet accelerator. This is because this plane cam transmission can generate a periodic motion of a large mass, and a dynamically advantageous motion law can be realized. The cam transmission is formed as a three-way transmission and comprises a support and drive and driven links. The drive link consists of two planar cams rigidly connected to each other, the driven link, also called a star roller carrier, is formed as a disk around which the cam rollers are arranged. In that case, the cam rollers exist in the corresponding cam body planes (pair shape) and perform mutual force transmission or reliable forced movement (Reference: Volmer, Getriebe).
technik-Kurvengetriebe (transmission technology-cam transmission),
VEB Verlag Technik Publishing, Second Edition, Berlin, 19
1989, see p. 102 et seq.).

In the case of this transmission, its structure is complicated and has a large mass (having two cam plates and two star-shaped roller carriers), requires a large structural space, and has a large mass, which causes a periodicity. There is a drawback that the accelerating force that limits the maximum number of rotations is generated by the dynamic movement.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to make a cam transmission having a rotary driven link which has a strong (rigid) structure that saves structural space and which allows the maximum rotational speed to be increased. is there.

[0006]

According to the invention, this object is achieved by means of the subclaims.

According to the invention, it is possible to make a cam transmission with a driven link that rotates periodically so as to achieve any desired purpose of movement, in which case it saves structural space and reduces the mass. A compact and inexpensive structure can be realized. The drive link and the driven link rotating in the same direction omit the transmission link used for reversing the movement which should be arranged between the driven link and the drive mechanism of the transmission, thereby saving the structural space and the inexpensive structure. Can be realized.
Due to the structure of the small mass transmission according to the invention,
The acceleration force, which is conditioned on the mass, is kept small and thus the maximum speed can be increased.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail with reference to the embodiments shown in the drawings.

FIG. 1 schematically shows a transmission device according to the invention.

A drive link 1 which continuously rotates at a drive angle φ is supported at a support point A0. This drive link 1 comprises a closing cam profile K1, K2, which is rigidly connected to each other.
Have K3. These cam contours K1, K2, K3
Cam rollers R1, R2, and R3 are operatively connected to each other by meshing connection. The cam rollers R1, R2, and R3 are hinged to the driven link 2, and the hinge points are located on the base circle radii r1, r2, and r3. The distance between the support point A0 of the drive link 1 and the support point B0 of the driven link 2 is shown as the support distance G. Support point B0
Are placed on the journal at support point A0 by extending the components.

The driven link 2 is formed as a bending-rigid star roller carrier having a lever length 1 with a roller and rotates at a driven angle ψ in the same direction as the drive link 1. In that case, the cam rollers R1, R2, R3 and the cam contours K1, K2, K3
The respective contact points with and are conditioned by the drive link 1 rotating at the drive angle φ, and the trajectory curves X1, X2, X
Draw three.

The formation of the cam contours K1, K2, K3 results on the one hand from the law of motion to be realized and on the other hand from the selected geometrical dimensions of the transmission as well as the absolute starting position of the driven link 2. By arranging at least two cam rollers K on the driven link 2, a meshing connection is ensured and movement transmission as well as forced movement can be ensured. The transmission of motion can be improved by the driven link 2 having the three cam rollers K.

2 and 3 schematically show the construction of the cam transmission according to the invention. The journal 3 at the support point A0 is arranged immovably and receives the drive link 1 which is driven by means not shown and which continuously rotates at a drive angle φ and is formed as a disc. The journal 3 is simultaneously formed as a bearing journal 4 and is used to receive a support point B0 which rotatably receives the driven link 2. The driven link 2 is simultaneously formed as an equilateral triangle, and has a roller shaft 5 for receiving the roller R at its corner point. The rollers R1, R2, R3 operatively contact the cam profile of the drive link 1 and thus follow the characteristic law of motion and thus drive the driven link 2 at the driven angle ψ. An operating link 6 is also rotatably supported on the bearing journal 4 located at the support point B0 and is connected to the driven link 2 by an interlocking body 7.
It is conceivable to provide the drive link 1 with an outer cam surface in order to change it for other movement purposes independent of the driven angle, thereby realizing a very compact transmission arrangement.

Of course, the transmission according to the invention can also be used in which the drive link 1 is used as a driven link and the driven link 2 is used as a drive link, in which case the cam profile K is used.
The drive link 1 rotates in the same way according to the law of motion realized by

However, the transmission according to the invention can also be realized by kinematic reversal. For this purpose, the drive link 1 is fixedly arranged on the support, and the support G or the journal 3 is driven to rotate continuously at the drive angle φ, in which case the driven link 2 makes a rotational oscillating motion.

The support points A0, B0 can also be arranged three-dimensionally axially offset from one another by structural measures known per se, in which case the support points A0, B0 are arranged.
Is projected onto the plane formed by the drive link 1, the support distance G is always smaller than or equal to the lever length with roller 1, or the cam contour K of the drive link 1 and the cam roller R of the driven link 2. It is always located inside the trajectory curve X formed by the rotation of the drive link 1 by the contact point.

[Brief description of drawings]

FIG. 1 is a motion diagram of a transmission device.

FIG. 2 is a schematic plan view of the structure of a transmission device.

3 is a cross-sectional view of the transmission device shown in FIG.

[Explanation of symbols]

 A0 Support point of drive link B0 Support point of driven link G Support interval K1 Cam contour K2 Cam contour K3 Cam contour R1 Cam roller R2 Cam roller R3 Cam roller X1 Trajectory curve X2 Trajectory curve X3 Trajectory curve r1 Basic circle radius r3 Basic circle radius Radius l Lever length with roller φ Drive angle ψ Driven angle 1 Drive link 2 Driven link 3 Journal 4 Bearing journal 5 Roller shaft 6 Working link 7 Interlocking body

Front Page Continuation (71) Applicant 390014188 Koenig Und Bauer-Albert Actiengezer Schaft KOENIG & BAUER AKTI ENGESELLSCHAFT Germany Würzburg Friedrichitz-Koenitz-Sichtraßer 4 (72) Inventor Birk, Wich-Kosicht -Strasse, 1 Be (72) Inventor Hans, Eiter Chungen, Am, Bendersberg, Germany, 35 (72) Inventor Erich, Biland Wurzburg, Mittlerer, Derenberg Wake, 52

Claims (12)

[Claims] 1. A processing machine, in particular printing, in which the cam transmission has a support, a drive link and a driven link, the drive link comprising a flat cam body, the driven link having a cam roller in contact with the cam body. In a cam transmission having a driven link that rotates periodically in a machine, the support point (A0) of the drive link (1) and the support point (B0) of the driven link (2) are formed by the drive link (1). Of the trajectory curve (X) drawn by the rotation of the drive link (1) by the contact point between the cam contour (K) of the drive link (1) and the cam roller (R) of the driven link (2) in the projection onto the plane. A cam transmission with a periodically rotating driven link in a processing machine, in particular a printing press, which is located inside. 2. A lever with a roller, wherein a support interval (G) resulting from an interval between the support points (A0, B0) results from an interval between the support point (B0) of the driven link (2) and the center point of the cam roller (R). Cam transmission according to claim 1, characterized in that it is less than or equal to the length (l). 3. The support point (B0) of the driven link (2) and the support point (A0) of the drive link (1) are arranged on a common journal (3). 2. The cam transmission device described in 2. 4. Cam transmission according to claim 1, characterized in that the drive link (1) comprises a cam profile (K) formed as an inner surface profile. 5. A cam transmission according to claim 1, 2 or 4, characterized in that the drive link (1) is provided with at least two cam profiles (K). 6. The drive link (1) is provided in particular with three cam profiles (K).
5. The cam transmission device according to any one of items 1 to 4. 7. A cam transmission according to claim 1, 2 or 4, characterized in that the drive link (1) is formed as a disc. 8. Cam transmission according to claim 1, 2 or 4, characterized in that the drive link (1) is provided with an outer cam surface for the purpose of carrying out another movement purpose. . 9. Cam transmission according to claim 1, wherein the driven link (2) is formed as a star roller carrier. 10. The cam transmission device according to claim 1, wherein the driven link (2) is formed as an equilateral triangle. 11. The cam transmission device according to claim 1, wherein the drive link (1) is arranged in a stationary manner, and the support points (A0, B0) rotate continuously at a drive angle (φ). 12. The drive link (1) and the driven link (2) rotate in the same direction.
Alternatively, the cam transmission device described in 2.