DE1087111B - Cutting machine for paper, cardboard or the like. - Google Patents

Description

GERMAN

The invention relates to a cutting machine for paper, cardboard or the like. With a dependent from the drive shaft via a drive device up and down moving press beams and with one generating the press beam pressure on the material to be cut as well as the working cylinder filling when the press beam is lowered.

In the known cutting machines, the working cylinder is to lower the press beam with a Connected line for supplying a pressurized gaseous or liquid medium is used to generate the necessary ram pressure before the start of the cutting process. The cutting knife is generally driven mechanically. The working cylinder is above that mentioned Line either to a storage tank for the pressurized medium or to a pressure pump connected. The circuit of the medium is designed so that the entire lowering movement of the Press bar and possibly also the lifting movement by a corresponding application of the in the working cylinder arranged working piston takes place. Accordingly, the storage tanks or the pressure pumps be dimensioned so that they transfer the press beam from the starting position to the pressing position enable and then generate the required contact pressure in the pressing position.

The known drive devices for the press beam thus require a considerable amount of pressure medium and pump power, as they on the one hand to overcome the entire play of movement, but on the other hand also to generate the high ram pressure must be laid out during the cutting movement.

The object underlying the invention con- sists now is to create a press device for a cutting machine with the above described features of the generic term that requires a little effort as possible to print media and also makes do with a minimum pump performance.

The object is achieved according to the invention in that the drive device for pressing in the Material to be cut has an idle travel stopping the press beam drive and the working cylinder in a hydraulic circuit with a pressure pump and a control valve is arranged, which for Generating the press beam pressure with the effective idle travel at least until the end of the cutting process closed is.

By this measure, an economical design and operation of the cutting machine is achieved because the drive device of the press beam for the lifting and lowering movements is not also at the same time to the cutting machine for paper,
Cardboard or the like

Applicant:

Karl Otte machine factory,
Gifhorn (Hann.), Lüneburger Str. 55

Karl Otte, Gifhorn (Hann.),
has been named as the inventor

Pressing in the material to be cut is provided. Because thanks to the innovative design of the cutting machine a pressure oil pump that is small in relation to the known drive devices is made possible because this is only effective while the material to be cut is being pressed in, whereas the lifting and lowering movements of the press beam before and after cutting through the depending on the movement and position the drive shaft effective drive device are generated. If the drive of the press beam at Lifting and lowering caused directly by the drive shaft for the cutting tool, so the drive power needs the cutting machine can only be increased insignificantly over the cutting work to be performed.

The drawing shows an exemplary embodiment of the subject matter of the invention in a schematic front view shown.

In a machine frame 1, a drive shaft 5 is rotatably mounted, which is driven by a motor and, by means of a single-turn clutch, can only perform a single rotation in the direction of the arrow χ shown in the figure. A sprocket 37, a cam 35 and a crank 6 are keyed onto the drive shaft 5. The chain wheel 37 drives a pressure pump 25 for a liquid medium via a chain 36. A control valve 27 is switched over by the cam disk 35 via a one-armed roller lever 34, which is pivotably mounted on a pivot pin 34 ′ arranged on the machine frame 1, and via a connecting rod 33.

With the crank 6 is via a link 7 the overhead end of a pin 8 'in the drawing pivotable angle lever 8 articulated, the lower end of which is provided with a pin 40, which engages in a longitudinal slot 9 'of a connecting rod 9 under the action of a tension spring 10. The longitudinal slot 9 'enables the mechanical

009 587/5

niche press beam drive stopping idle travel. The end of the connecting rod 9 facing away from the drive is pivotably mounted on a pin 11 ' four-armed lever 11 connected to the free end of a piston rod 12 of a working cylinder 13; is also pivotably mounted on the machine frame 1 about a pin 13 '. The four-armed one Lift! 11 is further removed from the drive shaft 5 via its arm 11 ″ 'and a link 14 lying bolt 15 of the press beam 4 and with another arm 11 "via a coupling rod 16, with the one arm of an angle lever 17 mounted on the machine frame, the other arm of which has a Link 18 is hinged to the pin 19 of the press beam 4 adjacent to the drive shaft. While the first half rotation of the drive shaft 5, the press beam 4 is due to the described connection pulled down by the mechanical drive of the cutting machine until it rests on the material to be cut 3. As a result, the angle levers 11 and 17 come to a standstill with their connecting rods, whereas the pin 40 of the angle lever 8 move freely in the longitudinal slot 9 'of the connecting rod 9 can.

At the beginning of the half revolution of the drive shaft 5 is by running up the role of the one-armed Roller lever 34 on the raised part of a cam 35 seated on the drive shaft 5 via a Connecting rod 33, the control valve 27, which is connected to an oil reservoir 21, is closed.

The pressure pump 25 is in one of the oil reservoir 21 outgoing and returning to this container pipeline 32, 24, 28, 30 switched on, from a pipe section 23 leading to the working cylinder 13 and a bypass pipeline containing the control valve 27 26,31 are branched. A pressure gauge 39 is connected to the pipeline 24, and an adjustable overflow valve 29 is located between the pipes 28, 30 the oil reservoir 21 and the space behind the working piston 38 in the working cylinder 13 is a pipeline 20 with a check valve 2 is provided.

The space 13 ″ in front of the working caliper 38 of the working cylinder 13 is on the one hand through an air suction valve 42 with a check valve ball and on the other hand by an air discharge valve 41 with a through an adjustable spring controllable check valve ball with the outside air in connection.

By advancing the piston rod 12 with its working piston 38 in the working cylinder 13 at the beginning of the Starting the drive shaft 5 is via the pipeline 20 containing the check valve 22 from the Oil reservoir 21 immediately oil into the working cylinder 13 sucked in until it is filled. Since at the beginning of the rotation of the drive shaft 5 through the cam 35, the one-armed roller lever 34 and the connecting rod 33, the control valve 27 has been closed, so presses the pressure pump 25, which is activated immediately with the rotation of the drive shaft 5, via the Pipeline 32 further oil on the underside or small Surface of the working piston 38, moves it in the working cylinder 13 and exercises via the connections 12, .11,11 '", 14 and 15 as well as over 11", 16, 17, 18 and 19 the required contact pressure on the press beam 4, whereby by adjusting the overflow valve 29 the level of the pressing pressure can be regulated by hand.

After the first half revolution of the drive shaft 5 has been exceeded, it continues to rotate the cam 35 opens the control valve 27, whereby the action of the pressure pump 25 on the small Surface of the piston 38 is lifted and the pumped pressure oil via the bypass pipe 31 into the oil reservoir 21 is discharged. Then, as a result of the reversal of movement, the crank 6 also causes the Linkage 7,8,9,11,11 '", 14,11" and 16,17,18 with the Press bar 4 returned to the starting position, since the pin 40 of the angle lever 8 at the right end of the Longitudinal slot 9 'comes to rest. Finally, upon completion of one revolution, the drive shaft 5 also the pressure pump 25 stopped. A work process is thus ended.

When the working piston 38 is pushed into the working cylinder 13, the air escapes through the from Hand adjustable air discharge valve 41, whereby a controllable braking effect on the press beam 4 when Decline is exerted on the stack of the material to be cut 3. As the working piston 38 goes back in the initial position shown, however, the air is sucked in again through the air intake valve 42, see above that the high gear of the plunger 4 is not made difficult.

Claims (2)

PATENT CLAIMS; 1. Cutting machine for paper, cardboard or the like. With a press bar up and down depending on the drive shaft via a drive device and with a working cylinder which generates the press bar pressure on the material to be cut and which fills when the press bar is lowered, characterized in that the drive device (6; 7, 8; 9, 11; 11 ';14; 18) for the press bar (4) for pressing in the material to be cut (3) has an idling path that shuts down the press bar drive and the working cylinder (13) enters a hydraulic circuit "with a pressure pump (25) and a control valve (27) is arranged, which is closed to generate the ram pressure with the effective idling path at least until the end of the cutting process. 2. Cutting machine according to claim 1, characterized in that the unloaded The cylinder space (13 ″) of the working cylinder (13) assigned to the piston surface has a dead space which Via a manually adjustable air exhaust valve (41) and an air intake valve (42) with the outside air connected is. Considered publications:
German Patent Nos. 571 315, 221 516;
U.S. Patent Nos. 2,638,166, 2,599,591. 1 sheet of drawings © 009 587/5 8.60