DE1249294B - Ribbon arrangement for sheet writers - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

B 41 j

German class: 15 g - 37/01

Number: 1 249 294

File number: S 79431VII b / 15 g

Filing date: May 14, 1962

Date of opening: September 7, 1967

The invention relates to a ribbon device for sheet typewriters with along the Row of movable type carrier trolleys in which an endless ribbon of ink guided over pulleys is in Depending on the movement of the type carrier carriage, the ink ribbon is switched on or off at the same time. re-inking drive roller can only be driven in one direction, with the movement of the type carrier carriage can be transferred to a roller, which is connected to the shaft of the drive roller via a wrap spring clutch can be coupled.

Compared to the conventional ribbon arrangements require ribbon arrangements with endless Ribbons less space and simpler means of propulsion: Because of their small footprint it and because of the associated low weight, ribbon assemblies with endless Ribbons in known typewriters with type carriers moving along the line arranged on the type carrier trolley. A special embodiment has already been proposed in which the ribbon transport device sits on the type carrier carriage and the drive via a form-fitting or force-fitting rolling on one of the stationary guide rails for the carriage Drive wheel takes place and when between the drive wheel and one driving the ribbon Feed roller a wrap spring clutch is provided (German Patent 1 203 290). A Such a drive for an endless ribbon is very simple in structure and very effective Reliable. Since the ribbon arrangement and its bearing elements are arranged on the type carrier carriage is and a drive of the endless ribbon only during the continuous writing operation and not during the return transport of the type carrier car to the starting position of a new line occurs, occur in this arrangement between the actual ribbon fork and the endless ribbon during the high-speed return movement of the Type carrier car in the starting position does not have any relative movements that accelerate destruction of the ribbon.

The increase in writing speed means that as many people move as possible To relieve parts in a typewriter from unnecessary ballast. This allows the driving forces for the moving parts and the working noise of these parts can be reduced.

For this reason, it is desirable to use sheet-fed typewriters with along the line wan ribbon arrangement for page typewriters

Applicant:

Siemens Aktiengesellschaft, Berlin and Munich, Munich 2, Witteisbacherplatz 2

Named as inventor:
Dipl.-Ing. Hans Kern, Munich

derndem type carrier trolley remove the type carrier trolley from the bearing elements of the ribbon arrangement if possible as well as relieve of the ribbon itself. However, the ribbon fork must be functional continue to be arranged on the type carrier trolley.

For typewriters where the type basket is fixed in the housing and where the Paper cart wanders along the print location is a ribbon arrangement for endless ribbons became known (German patent specification 147 678). A solution will be found on the basis of this ribbon order for tensioning the endless ribbon. The ribbon is intended during this arrangement the writing operation by a not disclosed gear in synchronism with the paper carriage are transported further and during the return transport of the paper carriage to the starting position remain calm. It is simple in structure, more reliable in function and as maintenance-free as possible Drive for such conditions is to be demonstrated by the present invention.

According to another known arrangement (U.S. Patent 2,714,850) it is in use Known from endless ribbons, the drive roller for the ribbon is used as the inking roller use.

The object of the present invention is to provide an ink ribbon arrangement with an endless ink ribbon explain which type carrier trolleys that can be transported along the line are not unnecessarily burdened and Nevertheless, it is simple in construction, works reliably and does not unnecessarily burden the ribbon and thereby damaged.

According to the invention is such a ribbon arrangement for sheet typewriters with along the Row of wandering type carrier wagons

. ■ 709 640/75

indicates that the pulleys and the drive roller are fixedly mounted on the housing and that the shaft of the drive roller during the advance transport of the type carrier over a fixed on the housing Oscillating spring can be locked and when the type carrier is transported back at one of the feed speeds of the type carrier car can be coupled to the same peripheral speed driven roller is, the diameters of the drive roller and the roller are the same, so that when the type carrier carriage returns the peripheral speed of the drive roller thus the speed of the ribbon in the area of the ribbon fork equal to the speed of the type carrier carriage and thus is also the same as that of the ribbon fork.

A ribbon arrangement constructed according to these features corresponds to that of the invention lying requirements for simplicity of the structure and for the greatest possible relief of the type carrier car.

Details of the invention emerge with reference to the one shown in the drawing and below described embodiment.

An endless ribbon 1 is guided by rollers 2 fixedly mounted on the housing and by a Drive roller 3 driven and colored. The drive roller 3 is held firmly on a shaft 4. One Deflection pulley 5, which redirects the rope for the type carrier carriage transport and the same diameter has like the drive roller 3, is rotatably mounted on the shaft 4. One designed as a loop clutch Spring 6 wraps around shaft 4 and one end engages in deflection roller S. Another Feather? wraps around the shaft 4 in the same direction of rotation, but one end is fixed to the housing tied together. The direction of rotation of the wrap springs 6, 7 working in a known manner is such that at Rotation of the pulley 5 counterclockwise ;, So when the type carrier carriage 8 is advanced with the ribbon fork 9 mounted on it, the wrap spring 6 opens, whereas when the shaft 4 attempts to rotate, the wrap spring 7 closes and the shaft 4 and thus also the drive roller 3 and the ink ribbon 1 are locked. When turning the pulley S clockwise, i.e. That is, during the carriage return transport, the wrap spring 6 wraps around the shaft 4, the wrap spring 7 opens and the shaft 4, and thus the drive roller 3 and the ribbon 1 taken from the pulley 3.

As a result of the same diameter and the same direction of rotation of the drive roller 3 and the deflection roller 5, the ribbon 1 and the ribbon fork 9 arranged on the type carrier carriage move with it same speed and in the same direction. In the context of the invention it is possible to have the endless To guide ribbon 1 according to the figure around the platen. On the other hand, the ribbon 1 in the opposite direction also around the

ίο type carrier trolleys are diverted.

Claims (1)

Claim: Ribbon device for page typewriters with type carrier carriage that can be moved along the line, in which an endless ribbon of ink guided over pulleys depending on the movement of the type carrier carriage over a the ribbon simultaneously inking or re-inking drive roller can only be driven in one direction is, wherein the movement of the type carrier carriage can be transferred to a role that is connected to the shaft the drive roller can be coupled via a wrap spring clutch, characterized in that that the pulleys (2) and the drive roller (3) are fixedly mounted on the housing and that the Shaft (4) of the drive roller (3) when the type carrier is transported over one on the housing Fixed loop spring (7) can be locked and when the type carrier (8) is transported back with the one of the feed speed of the type carrier carriage (8) equal peripheral speed driven roller (5) can be coupled, the diameter of the drive roller (3) and the Roll (5) are the same, so that when the type carrier carriage returns, the peripheral speed the drive roller (3) and thus the speed of the ribbon (1) in the area of the ribbon fork (9) equal to the speed of the type carrier carriage (8) and thus also equal to that of the Ribbon fork (9) is. Considered publications:
German Patent No. 147,678;
German utility model No. 1 801 234; U.S. Patent Nos. 2 103 734, 2 714 850. Legacy Patents Considered:
German Patent No. 1 203 290. 1 sheet of drawings 709 640/75 8.67 © Bundesdruckerei Berlin