US2732205A

US2732205A - Delivery frame in sheet printing press

Info

Publication number: US2732205A
Authority: US
Priority date: 1950-05-20
Filing date: 1951-05-12
Publication date: 1956-01-24
Anticipated expiration: 1973-01-24
Also published as: NL84419C; FR1039290A; DE852545C; GB716428A

Description

Jan. 24, 1956 P. DIETRICH .ETAL

DELIVERY FRAME IN SHEET PRINTING PRESS Filed May 12, 1951 )5 INVENTORJ PAUL. Dam-men E,

Hmls BAYER.

BY 'm/zzyw A TTORN E YS United States Patent DELIVERY FRAME IN SHEET PRINTING PRESS Paul Dietrich and Hans Bayer, Augsburg, Germany, as-

signors to Maschinenfahrik.Augsburg-Nurnberg A. G., Augsburg, Germany, a corporatien of Germany Application May 12,1951, Serial No. 225,ss9

Claims priority, application Germany May 19, 1950 Claims. (Cl. 271--7s) This invention relates to certain improvements in the chain delivery of sheet printing presses and has particular reference to a device for holding the upwardly swingable frame for the chain delivery andtcomprising supporting "The two supports have an approximately vertical position and require a corresponding space in the machine frame. In their raised position they tend to obstruct the free space at the side where the sheets are discharged.

It is an object of the present invention to provide a more favorable arrangement of a device'of the kind referred to.

A special object of the invention is to facilitate the assembling and to reduce the space occupied by the spring.

With these and further objects in view, according to the present invention the support for the chain delivery frame in the operative position thereof is disposed approximately in the same horizontal plane as the swingable frame and connected to the frame in the vicinity of the main pivot thereof. The support in this case does not require any space within the machine frame; it even leaves the space at the sheet delivery entirely unobstructed so that the operator is not hindered in any way; the toothed rack and the toothed wheel are dispensed with. The support bears on a stationary abutment so as to be longitudinally slidable thereon, whereby a very simple assemblage is obtained.

The spring may be arranged in various manners; it is preferred to arrange the spring within the frame which is possible by the construction according to the present invention. This offers the further advantage that the spring means can be fitted in the swingable frame and ten- .sioned before being inserted in the printing press, so that the finished frame can be assembled outside the printing press and then fitted into the same. Moreover, it does not require any additional space in the machine frame. Where the space available in the chain delivery frame is not sufficient for accommodating a sufiiciently strong torsion spring, the same may be combined, according to a further feature of the invention, with a tension spring acting on a second lever arm of the support and exerting a torque combining with that of the coiled torsion spring, thus reinforcing the action of the coiled torsion spring. The opposite end of this tension spring may be fixed to the machine frame, but it is preferred to secure it also on the chain delivery frame.

Other and further objects, features and advantages of the invention will be pointed out hereinafter and appear in the appended claims forming part of the application.

In the accompanying drawings a now preferred embodiment of the invention is shown by way of illustration and not by way of limitation.

Fig. l is an elevation of part of a cylinder press having the invention applied thereto, and

2,732,205 Patented Jan. 24, 1956 ,the two figures.

Referring to the drawing it will be seen that the frame 2 for the chain delivery is mounted on the machine frame 1, 1 so as to be swingable about the pivot 3 and bears two pairs of

chain carrying wheels

4 and 5. Two helical torsion springs '7 and 7 are carried on a rotatable shaft 10 within the frame 2. One end 6 of each of these springs bears on the frame 2 while the opposite ends 8 and 8' are connected through a disk 9 fixedly mounted on shaft 10 so that springs 7 and 7' tend to exert a torque on shaft 10 with respect to the chain delivery frame 2. Outwardly of frame 2 and fixedly secured to shaft 10 is a pair of supported members 11. One end 12 of each support member 11 rests upon a supporting abutment including a race 13 mounted on an arm 14 of the main printing press frame 1, 1. Thus, the support members 11 tend to swing with respect to the abutment 13 and frame 2, upon rotation of shaft 10 under the torsion action of springs 7, 7', to impart to the frame 2 a moment of force tending to swing the frame 2 about pivot 3 from the full-line operating position to thedot-dash-line raised position shown in Fig. 1.

This action is increased by a pair of tension springs 15 arranged on both sides and acting upon a second lever arm 16 of the support 11, while being secured to the frame 2 at 17. At this point a set screw 29 is provided for regulating the tension of the spring 15. This screw is adjusted in such a way that it cooperates with the spring 7, 7', which is not adjustable, so as to hold the frame 2 immovable in its operative position shown in full lines in Fig. l, or in any other raised position, e. g. in that indicated by dot and dash lines. In the raised position of the frame the torque exerted by the weight of the frame is reduced by the shortening of its effective lever arm. This reduction is counteracted by a corresponding reduction of the force of the springs, more particularly the tension force of the tension spring 15, whose extension is reduced in this position by the lessened distance between 16 and 17, in such a way that a variable moment connection is provided to stop the frame automatically at any position into which it has been raised by hand. In the operative position of the frame the connecting rod 18 between the two walls of the frame 2 can be locked with respect to the arm 14 of the machine frame. The rod 18 has a tenon 19 milled at each end. The circular boring for receiving the ends of rod 18 in arm 14 includes an upwardly directed slot 20. When rod 18 is rotated, by means of handle 21, to have the tenons 19 in a substantially vertical plane (see dottedposition Fig. 1), the vertical slots 20 will admit tenons 19 into their borings in the arm 14. Rotation of handle 21 to bring the tenons to a horizontal position (see solid line position Fig. 1) prevent the tenons from exiting upwardly through slots 20 and the entire frame is thus firmly latched in operating position.

By' suitable assembling devices the two supports 11 can be locked with the arms of the frame 2 in such a way that all springs can be tensioned also outside the machine frame and the frame of the chain delivery can be readily fitted outside the machine. These locking means may be removed when the frame is assembled and the ends 12 of the support are bearing on the bearing planes 13.

While the invention has been described in detail with respect to a now preferred example and embodiment of the invention it will be understood by those skilled in the art after understanding the invention that various changes and modifications may be made without departing from the spirit and scope of the invention and it is intended, therefore, to cover all such changes and modifi cations in the appended claims.

What is claimed is:

1. In a printing press having a chain delivery mechanism for conveying printed sheets and a frame therefor adapted to be moved from an operating position into a plurality of raised positions about a pivot adjacent one end thereof, the combination which comprises a support member for supporting said frame on said press and disposed substantially in the same horizontal plane as said frame in said operating position thereof, torsion spring means in substantially the same horizontal plane as said frame for counterbalancing said frame, supplementary spring means interconnecting said support member and said frame for compensating for varying turning moments of said frame about said pivot to maintain said frame in any of said positions, and latching means on said frame positively engaging said press in said operating position of said frame.

2. In a printing press having a chain delivery mechanism for conveying printed sheets and a frame therefor adapted to be moved from an operating position into a plurality of raised positions about a pivot adjacent one end thereof, the combination which comprises a pair of support members for supporting said frame on said press disposed at either side thereof and substantially in the same horizontal plane with said frame in said operating position thereof, supporting abutments on said press for slidably receiving and supporting one end of said support members, means for pivotally interconnecting said frame with said support members at the opposite end thereof, torsion spring means engaging said frame and said support member pivot means producing torque thereabout tending to urge said frame upwardly out of said operating position, supplementary adjustable tension spring means, and means for connecting said supplementary tension spring means to said frame and said support members for urging said frame upwardly out of said operating position with varying degrees of force as turning moments of said frame about said pivot vary with the position of said frame, all said spring means being substantially in the same plane with said frame and cooperating with said support members for counterbalancing turning moments of said frame to maintain said frame in any of said positions.

3. A printing press having a chain delivery mechanism for conveying printed sheets and a frame therefor adapted to be moved from operating position into a plurality of raised positions about a pivot adjacent one end thereof, the combination which comprises a pair of support members for supporting said frame on said press disposed at either side thereof and substantially in the same horizontal plane with said frame in said operating position thereof, a shaft for pivotally interconnecting said frame with said support members intermediate the ends thereof, supporting abutments on said press defining a race for receiving one end of said support members longitudinally slidably in said race, main torsion spring means engaging said frame and said shaft for urging said frame upwardly out of said operating position, and supplementary adjustable spring means interconnecting said frame and the other end of said support members urging said frame upwardly out of said operating position with varying degrees of force as turning moments of said frame about said main pivot means vary with the position of said frame for maintaining said frame in any of said positions.

4. In a counterbalancing device for maintaining the chain delivery frame of a printing press in any of an operating position and a plurality of raised positions, the combination which comprises a pair of supporting members for supporting said frame on said press and disposed substantially in the same plane as said frame in said operating position thereof, means for pivotally connecting said supporting members with said frame for swinging movement with respect thereto, counterbalancing spring means substantially entirely within said frame, means for connecting said spring means to said supporting members and said frame for urging said swinging movement of said supporting members in a direction tending to move said frame into said raised positions, and supplementary spring means in substantially the same plane as said frame interconnecting said frame and said supporting members for varying the swinging force exerted on said supporting members as the swinging movement of said frame varies to maintain said frame in any of said positions.

5. In a counterbalancing device of the character described for maintaining pivotally mounted printing press chain delivery frames in any of an operative and plurality of raised positions, the combination which comprises a pair of support members for supporting said frame on said press and disposed in substantially the same plane as said frame in said operative position thereof, a shaft for pivotally mounting said support members on said frame for swinging movement with respect thereto, a pair of abutments for slidably receiving one end of said support members, torsion spring means for counterbalancing said frame, means for interconnecting said torsion spring means with said frame and said shaft for imparting said swinging movement to said support members in a direction tending to urge said frame into said raised positions, supplementary tension spring means, means for interconnecting said tension spring means with said frame and the other ends of said supporting members for supplementing the torque of said torsion spring means to varying degrees as the turning moment of said frame varies in said different positions thereof to maintain said frame stationary in any of said positions.

References Cited in the file of this patent UNITED STATES PATENTS 253,768 Saxton Feb. 14, 1882 1,203,878 Hudson Nov. 7, 1916 1,229,722 Creso June 12, 1917 1,242,736 Sturtevant Oct. 9, 1917 1,295,449 Douglass Feb. 25, 1919 1,306,853 Larsen June 17, 1919 1,477,441 Haase Dec. 11, 1923 1,857,623 Clark May 10, 1932 2,250,657 Seybold July 29, 1941 2,484,674 Berry Oct. 11, 1949