JPH08295431A - Compression foot unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out a motion stroke of a press foot having no fear of collision with the uppermost paper sheet lifted from a paper sheet pile by improving a press foot unit. SOLUTION: A parallelogram link type transmission mechanism has two pivotable oscillation levers 5, 6 making a rotation shaft 4 fixed and arranged on a machine frame as a center. One oscillation lever 5 of both oscillation levers 5, 6 is horizontally extended in the normal direction or the reverse direction from a belonging rotation shaft 4 toward the conveying direction 7 of the paper sheet and the other oscillation lever 6 is extended from the belonging rotation shaft 4 toward the approximately vertical and downward direction. The respective oscillation levers 5, 6 are turnable by rotatable cam discs 8, 9 independently disposed. An approximately vertical press foot lever 11 retaining a press foot 2 is pivotally mounted to a free end of one oscillation lever 5 and an approximately horizontal lever 10 is pivotally mounted to a free end of the other oscillation lever 6. The parallelogram link mechanism is completely formed by pivotally mounting and binding the free end of the horizontal lever and the vertical press foot lever.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressurizing foot which can be mounted on the surface of the rear area of a sheet pile and separated and swiveled in accordance with the work cycle of a sheet processing machine. The present invention also relates to a pressurizing foot unit of the type arranged in a parallelogram link type transmission mechanism that can be moved by a cam disk that can also be rotationally driven.

[0002]

2. Description of the Prior Art A pressure foot unit of the type mentioned at the outset is known from DE-A 29 475 564. In this case, the parallelogram linkage transmission mechanism comprises two swiveling levers, one end of each swiveling lever being pivotally attached to one end of one pulling rod and the other end of both swiveling levers. The department is pivotally attached to a mechanical mount. One turning lever holds the pressure foot, while the other turning lever can be driven to turn by a cam. Due to the fixed bearings of the two swiveling levers, the pressure foot can only have a limited movement stroke. As a result, the pressure foot may collide with the uppermost sheet that has been lifted up immediately before the turning away from the sheet pile and damage the sheet.

[0003]

SUMMARY OF THE INVENTION It is an object of the invention to improve a pressure foot unit of the type mentioned at the outset such that a pressure foot movement stroke is possible without the risk of collision. Is.

[0004]

Means for Solving the Problems The constituent means of the present invention for solving the above-mentioned problems is to provide a parallelogram linkage type transmission mechanism having two swings capable of swinging around a swing axis fixedly arranged on a machine frame. A moving lever, one of the two swinging levers extends substantially horizontally from the associated turning axis in the forward or reverse direction with respect to the sheet conveying direction, and the other swinging lever A lever extends substantially vertically downward from the associated pivot axis, and each rocking lever can be pivoted by its own independently arranged rotationally drivable cam disk, and at the same time one of the rocking levers can be pivoted. A substantially vertical pressing foot lever holding a pressing foot is pivotally attached to the free end portion of the movable lever, and a substantially horizontal lever is pivotally attached to the free end portion of the other swing lever. And the free end of the horizontal lever and the vertical pressure Parallelogram link mechanism by pivotally coupling the lever is in that it is completed form.

[0005]

Since the horizontal movement and the vertical movement are regulated by their own cam discs (may be eccentric discs), a large movement stroke and a vertical movement component course and a horizontal movement component course are generated. Different motion strokes are possible. This results in a swiveling of the pressure foot away from the sheet pile area and a reliable collision of the pressure foot with the lifted sheet. By properly shaping the cam curved surface of the cam disc, the inward pivoting movement of the pressure foot into the sheet pile area can be carried out after a sufficient vertical travel, so that the sheet pile There is no deviation in the uppermost sheet of the sheet, and therefore no illegal gripping of the uppermost sheet by a transfer device such as a sheet separating soccer.

If the substantially horizontal rocking lever extends from its pivot axis in the direction opposite to the sheet transport direction, then the pressure foot unit is almost entirely located above the sheet pile. Therefore, the required space is saved.

When both swing levers can swing about a common swivel axis fixedly arranged on the machine frame,
The number of components required is particularly low.

In order to drive the motion of the rocking levers with low friction, a cam driven roller loaded by a cam disk arranged in each rocking lever is rotatably supported by each rocking lever.

If the cam driven roller of the rocking lever is arranged between the rocking lever pivot points of the adjoining pressure foot levers or horizontal levers of the parallelogram linkage,
The space required is particularly saved.

Also in order to reduce the required space,
Both cam disks can be rotationally driven about a coaxial rotation axis extending in a lateral direction perpendicular to the transport direction,
In this case, it is particularly advantageous for the axis of rotation to extend in the area enclosed by the parallelogram linkage.

If the two cam disks can be rotated independently of each other about their associated axes of rotation, the inequality of the course of the inward turning movement with respect to the course of the outward turning movement of the pressure foot is variable. .

If both cam disks are arranged on a common drive shaft, the number of components and the space required are small.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings.

The illustrated presser foot unit is a sheet pile 1
It is arranged on the upper side of the rear area and is composed of a parallelogram link type transmission mechanism 3. The parallelogram link type transmission mechanism 3 includes a swing lever 5 extending substantially horizontally from the swivel shaft 4 in the direction opposite to the sheet conveying direction, and the swivel shaft 4
And a swing lever 6 that extends downward substantially vertically from. Both rocking levers 5 and 6 are rotatably supported on a swivel shaft 4 that is fixedly arranged on the machine base 13.

At the lower end of the swing lever 6, the swing lever 5
A horizontal lever 10 that extends in a direction opposite to the conveying direction indicated by the arrow 7 is pivoted substantially parallel to the horizontal direction. A pressure foot lever 11 is pivotally attached to the free end of the rocking lever 5 in parallel with the rocking lever 6, and the pressure foot lever is provided in the central region thereof via a joint so as to convey in the conveying direction. 7
To the lever end 16 of the pressure foot lever 11 which is pivotally connected to the end of the horizontal lever 10 facing in the opposite direction and which extends further downwards beyond the joint, The pressure foot 2 is arranged. The pressure foot 2 has a pin 17 protruding substantially vertically upward, and the pin is slidably guided in a hole 18 corresponding to the lever end 16 of the pressure foot lever 11. Has been done. A free end of the set screw 20 is axially slidable but prevented from freely rotating in another hole 19 drilled in the lever end 16 substantially parallel to the hole 18. And the set screw 20 has a male thread shank 2
2 has a screw head 23 at its lower end which projects downward through a corresponding female screw hole 21 in the pressurizing foot 2. The height of the foot tip portion 24 of the pressure foot 2 mounted on the rear area of the sheet pile 1 can be adjusted in the vertical direction by the set screw 20.

A cam driven roller 12 is rotatably arranged in the substantially central region of the rocking lever 5, and a cam driven roller 13 is rotatably arranged in the lower region of the rocking lever 6.

In the area surrounded by the parallelogram link type transmission mechanism 3, a drive shaft 14 extends in a transverse direction at a right angle to the conveying direction 7, and the drive shaft 14 should feed sheets. It can be driven to rotate according to the work cycle of the sheet processing machine.

A cam disk 8 and a cam disk 9 are arranged in parallel with each other on the drive shaft 14, and both cam disks are rotatable relative to each other about the drive shaft 14 and their relative positions can be determined. The cam disk 8 is in contact with the cam driven roller 12 by its outer peripheral surface 25, whereas the cam disk 9 is in contact with the cam driven roller 13 by its outer peripheral surface. Each cam disk 8 and 9 has a smaller radius area and a larger radius area, respectively, all around its circumference.

In FIG. 1, the state of the pressure foot unit in which the smaller radius area of the cam disk 8 is in contact with the cam driven roller 12 and the swing lever 5 is in the lower limit swing position is shown by a solid line. . The upper limit position of the rocking lever 5 is shown by a broken line.

Further, the state in which the larger radius area of the cam disk 9 is in contact with the cam driven roller 13 is shown by a solid line, which is irreversible, and the swing lever 6 is moved to the maximum in the conveying direction 7. It means that it is in a swinging position. On the other hand, the position where the swing lever 6 is swung to the maximum in the direction opposite to the transport direction 7 is shown by a broken line.

Both positions of the pressurizing foot unit shown by a solid line and a broken line are both extreme positions, and the pressurizing foot unit, and by extension, the pressurizing foot 2 moves between these extreme positions.

The mutual position of the two cam disks 8 and 9 makes it possible to define both the movement distance of the pressure foot 2 during the inward stroke movement and during the outward stroke movement.

Thus, due to the cam disk 8 defining the vertical movement, the inward stroke movement has only a weak downward movement component in the first stroke portion, whereas it is strong in the last stroke portion. It can be defined that there is a downward motion component.

At the same time, if the horizontal motion component defined by the cam disk 9 is designed to be strong at the beginning of the inward stroke motion and very weak at the end of the inward stroke motion, the pressurizing force is increased. In the latter part of the inward stroke movement, the foot 2 is satisfactorily vertically mounted on the upper surface of the sheet pile 1 in order to obtain an inward stroke movement without shifting the upper sheet of the sheet pile. To be The history of the inward stroke movement of the pressure foot 2 is shown in FIG.
Is illustrated in.

Since the two cam disks 8 and 9 can independently define the horizontal motion history and the vertical motion history of the pressure foot 2, the outward stroke motion history of the pressure foot 2 as shown in FIG. It is possible to obtain In that case, immediately after the pressure foot 2 is separated from the upper surface of the sheet pile 1, a strong horizontal motion component defined by the cam disk 9 is generated, and the horizontal motion component causes the pressure foot 2 to move into a single sheet. It is quickly moved rearward from the area of the paper pile 1. At the beginning of the outward stroke movement, at the same time, the vertical movement component is kept small by the cam disk 8, so that the uppermost position in the position lifted from the sheet pile 1 by a transfer device, for example a separating football. No collision between the sheet and the pressure foot occurs.

[Brief description of drawings]

FIG. 1 is a side view of a pressure foot unit according to an embodiment of the present invention.

2 is a motion curve diagram of an inward stroke motion of the pressurizing foot unit shown in FIG.

FIG. 3 is a motion curve diagram of outward stroke motion of the pressurizing foot unit shown in FIG.

[Explanation of symbols]

1 sheet pile, 2 pressure foot, 3 parallelogram link type transmission mechanism, 4 swivel axis, 5, 6
Swing lever, 7 Arrows indicating the transport direction, 8, 9
Cam disk, 10 horizontal lever, 11 pressure foot lever, 12, 13 cam driven roller, 14
Drive shaft, 15 mechanical mount, 16 lever end,
17 pins, 18, 19 holes, 20 set screws, 21 female screw holes, 22 male thread shank, 23 screw heads, 24 foot tips, 25, 26 outer peripheral surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Wolfgang Mattois, Germany Offenbach Gustav-Stresemann-Strasse 13 (72) Inventor Uwe Bezel, Germany Offenbach Northring 4

Claims (9)

[Claims] 1. A pressure foot, which can be mounted on the surface of the rear region of the sheet pile and can be swiveled away from one another according to the work cycle of the sheet processing machine, can be rotationally driven according to the work cycle. In a pressurizing foot unit of a type arranged in a parallelogram link type transmission mechanism movable by a cam disc, the parallelogram linkage type transmission mechanism is centered on a pivot shaft (4) fixedly arranged on a machine frame. It has two swing levers (5, 6) that can be swung, and one swing lever (5) of both swing levers is in the sheet conveying direction (7) from the associated swivel axis (4). On the other hand, the swing levers (6) extend substantially horizontally in the forward direction or the reverse direction, and the other swing lever (6) extends substantially vertically downward from the associated swing shaft (4). 5, 6) are cam disks that are independently arranged and can be driven to rotate. A pivoting foot lever (11) for holding the pressurizing foot (2) is pivoted on the free end of the one rocking lever (5) while being pivotable by (8, 9). And the other rocking lever (6)
A parallelogram link by pivotally attaching a substantially horizontal lever (10) to the free end of the lever and pivotally connecting the free end of the horizontal lever and the vertical pressure foot lever. The mechanism is formed completely,
Pressure foot unit. 2. Pressurization foot according to claim 1, characterized in that the substantially horizontal rocking lever (5) extends from its pivot axis (4) in the direction opposite to the sheet conveying direction (7). unit. 3. The pressurizing foot unit according to claim 1, wherein both swing levers (5, 6) are swivelable about a common swivel shaft (4) fixedly arranged on the machine frame. 4. A cam follower roller (12, 13), which is loaded by a cam disk (8, 9) provided on each swing lever (5, 6), is rotatably supported by a shaft. The pressure foot unit according to any one of claims 1 to 3. 5. A cam driven roller (12, 13) of a rocking lever (5, 6) is a rocking lever for an adjoining pressure foot lever (11) or horizontal lever (10) of a parallelogram linkage. The pressure foot unit according to claim 4, wherein the pressure foot unit is disposed between the pivot points. 6. A camshaft according to claim 1, wherein both cam disks (8, 9) are rotationally drivable about a coaxial rotational axis extending transversely to the conveying direction (7). The pressure foot unit according to claim 1. 7. The pressure foot unit according to claim 1, wherein the axis of rotation extends in the region enclosed by the parallelogram linkage. 8. Both cam disks (8, 9) are independently adjustable with respect to each other about their associated axis of rotation.
The pressure foot unit according to any one of claims 1 to 7. 9. Pressure foot unit according to claim 6, characterized in that both cam disks (8, 9) are arranged on a common drive shaft (14).