US1247296A

US1247296A - Roller copying-press.

Info

Publication number: US1247296A
Application number: US6946815A
Authority: US
Inventors: Edmund Lichtenstein
Original assignee: Individual
Current assignee: Individual
Priority date: 1915-12-30
Filing date: 1915-12-30
Publication date: 1917-11-20
Anticipated expiration: 1934-11-20

Description

E. LICHTENSTEIN.

ROLLER COPYING PRESS.

APPLICATION FILED nc.30.1915.

Patented Nov. 20, 1917.

3 SHEETS--SHE ET I.

l/mundb/chiavsta /n Eve/7810f g) 7 fiifiom @f E LICHTENSTEIN.

ROLLER COPYING PRESS,

APPLICATION FILED nmso. 1915.

15%4K296 Patented Nov. 20, 1917 3 SHEETS-SHEET 2.

E. LICHTENSTEIN.

ROLLER COPYING PRESS.

APPLICATION FILED nc.30. 1915.

1 ag fiv Patented Nov. 20, 1917.

3 SHEETS-SHEET '3- UNITED %TATF@ nor/rune ticnrnnsrnin, or cnantorrlinnuae, GERMANY,

ROLLER comma-eases.

Application filed December 30, 1915.

To all whom it may concern Be it known that I, EnMUNn LICHTEN- STEIN, a subjee't of the German Emperor, residing at Gharlottenburg, near Berlin, Germany, Dahlmannstrasse 9, hate invented certain new and useful Improvements in Roller Copying-Presses, of which the following is a specification.

In roller presses for copying letters and the like it is absolutely necessary to release the compression of the rollers after the operation of the machine has ceased to avoid adhesion of the copying paper to the rollers and the damaging of the soft rubber mantles of the rollers. I-Ieretofore the release of the compression of the rollers could only be effected by a special operation and was therefore often overlooked, thereby causing injury to the machine and interfering with the operation thereof.

According to the present invention this disadvantage is removed owing to the fact that at the cessation of operation of the machine the release of compression of the rollers is effected automatically.

In a very simple way this can be made by advancing or retarding the driving means, viz: giving thereto a lost motion relative to the working rollers or copying rollers of the machine This part of the driving motion can then be used for the release of the compression of the working rollers.

In copying machines it is already known to connect with the driving means a tension device which as the machine starts automatically presses the working rollers against each other. According to a modification of the invention such a tension device is used for effecting the release of pressure after the operation has ceased. This is effected by making the abutment taking up the re-action of the force compressing the rollers automatically inoperative, after the operation of the machine has ceased.

In a preferred modification of the invention the tension device comprises a system of planetary gear-wheels, the middle wheel of which is retained during the operation of compressing the rollers by the frictional resistance of the machine or by a brake or a locking device, and is automatically released, after the rollers have been compressed by the planetary part of the system and an auxiliary force for the releasing of the rollers has been accumulated.

Specification of Letters Patent.

. 'atented Nov. 2t), 191?.

Serial No. 69,468.

In the drawing three modifications of the object of the invention are shown.

Figure l is a side-view of a machine with a planetary system, some parts being shown in section and some parts being omitted for the sake of clearness,

Fig. 1 is a plan thereof in an enlarged scale,

Fig. 2' is a side-view of a machine in. which the tension device used heretofore in some machines for the compression of the rollers, is used for the release of compression of the rollers,

Fig. 3 is a plan of the machine shown in Fig. 2,

Fig. 1 is a side-view of a machine with a brake which retards the release of compres- S1011, 7

Figs. 5 and 6 are sectional side-views of the main parts of a machine, whereof the rollers are compressed and relieved from compression without the use of any special mechanism.

The working rollers of the machine are termed 1, 2 and 3. The operation of such a machine is known to the man skilled in the art and is therefore not described here. The roller 3 is supported on the shaft or axle a mounted in suitable bearings in the frame of the machine. At each end of the shaft 41 a lever 5 is arranged which can swing about the shaft 4. At the ends of the levers 5 is supported the shaft or axle 6 supporting the roller .2. By the tension of spring 7 the roller 2 is pressed against the roller 1. The axle 8 of the roller 1 is in contact with the rigid abutment 9 but movable with respect thereto, so that the pressure from the roller 1 is transferred to the roller 3.

The lever 10 whose eccentric cam 11 engages with an abutment 12 securely fixed to the frame of the machine, is rotatable about the axle 6. To the lower end of the lever 10 is connected a tension spring 13, whose other end is connected to the frame of the ma chine, so that the spring always tends to draw the lower end of the lever 10 toward the roller 3, that is to the left in Fig. 1. Above the tension spring 13 a link 14 is pivotally connected to the lever 10, the other end of said link being pivotally connected to a lever 15, which is rotatable about the axle 4.

-A driving crank 17 rigidly connected with the gear-wheel 18 is supported in the frame of the machine and is rotatable about the axle or rod 16. Saidgear-wheel 18 meshes in the large gear-wheel 19 which is rotatable about the axle 4. In gear-wheel 19 also meshes a planetary gear-wheel 20 supported by the enlarged end 22 of the lever by meansof pivot 21, lever 15 being rotatable about the axle 4. The gear-wheel is wider than the gear-wheel 19 and the part thereof which projects beyond the gearwheel 19 engages with the gear-wheel 23 which is also supported by the part 22. The wheel 23 meshes in the gear-wheel 2 1 firmly secured to the axle 4. The device operates as follows:

When the crank 17 is rotated in a clockwise direction, the loose intermediate gear 19 is rotated in a counterclock-wise direction by means of the gear wheel 18. The gearwheel 20 is thereby rotated in a clock-wise direction and by means thereof the gearwheel 23 is rotated in a counterclock-wise direction. The gear-wheel 24: being rctained by the resistance of the working rollers against rotation, the gear-wheel 23 has a planetary motion on the gear -wheel 24 which wheel in this motion acts as the stationary middle-wheel of the planetary systern. By this motion the gear-wheel 23 travels in 'a counterclock-wise direction (to the left in Fig. 1) together with the whole arm 22 until the latter abuts against the stationary stop 25. This movement of the arm 22 causes the link 14: and the lower end of the lever 10 to move to the other side (to the right hand), whereby the spring 13 is stretched. At the same time the cam 11 moves on its counterpart or abutment 12 in such a manner that the part of its'circumference nearest to the axle 6 engages the abutment 12. The lever 5 and the roller 2 are in consequence of the above drawn upward by the tension of spring 7 and the

rollers

1, 2 and 3 are pressed against each other as described above.

As soon as the hand of the operator leaves the crank 17, the lever 10 is drawn backward (to the left) by the spring 13, so that the upper part of the cam 11 engages the abutment 12 which releases compression of the

rollers

1, 2 and 3. At the same time the lever 15 is pressed backward (to the left) by the link lt and inFig. 1.

29 (indicated by dotted lines in- Fig. 3). The lever supportingthe segment 27 has a portion 31 rojecting behind the hub 32 of the crank 17. The stationary'axle 16 of the latter is surrounded by a tube 33 which is securely fixed to the gear-wheel 18 and is therefore freely rotatable about the axle 16. The tube 33 is provided with an obliquely inclined slot 34 in which engages, a pin 35 securely fixedto the hub 32 of the crank 17. The crank 17 with its hub 32 is slidable'on the axle 16 and on the tube 33 against the pressure of the spring 36. Q

This modification operates as follows If the crank 17 is rotated in a clock-wise direction the pin 35 moves at first along the slot 34, so that the hub 32 with the crank 17 travels axially away from the gear-wheel 18 which motion compresses spring 36. The toothed locking segment 27 acted upon by 7 spring 29 follows the hub 32 and engages the locking tooth 30. As thepin 35 reaches the outer (right hand) end of the slot 34, the relative rotation of the crank 17 against the gear-wheel 18 ceases. This gear-wheel is then rotated and thereby causes the

workingrollers

1, 2 and 3 to rotate. By means of the lever 26 these rollers are'compressed in a manner which is known and is therefore not described herein. During this compression the locking tooth 30 slides over the inclined back-faces of the teeth of the segment 27, thus compressing the pressurespring 37. After the rollers are sufliciently compressed, the tooth 30 is locked by the steep front face of the locking tooth just above tooth 30 in the corresponding groove between the teeth of the segment 27. There-.

upon the machine operates as an ordinary f copying machine. 7

When released the crank 17 is pressed backward '(to the left) by the spring 36 whereby the segment 27 is moved by means of the projection 31 away from the lever 26 and the locking tooth 30 against the, tension of the spring 29. In consequence of the above the locking tooth .30 is disconnected-- from the segment 27 whereupon lever26 is pressed upward by the spring 37, and the compression of the. working

rollers

1, 2, 3 is released.

In the modification of Fig. 4 the crank 17 is connected in the usual-way with the driving mechanism of the working

rollers

1, 2, 3. The compression of these rollers is effected by means-of the known lever 26' pressing the cam 38 against the abutment or.

the new machine, as thereis inserted between" the lever26 and the frame of thema chine a brake device 39in theform of an air-buffer, oil-buffer or the like. Said brake device -per- 'mits of only a very slow release of compression ofthewor king rollers fora short in terval of time. Consequently during half of a complete revolution of the working roller 3 only a practically imperceptiblerelease of compression of the working'rollers takes place, which limited release is compensated for by the neiitof the two" rotating cams 4.0 striking the lever 26. Therefore during the use of the machine the rollers are under compression; as the operation of the machine ceases, the rotation of the cams 40 also ceases thereby releasing the compression of the

rollers

1, 2 and 3.

Furthermore, the new machine can be so constructed that the rollers can be pressed against each other and the pressure can be released without any auxiliary device.

In the simplest way this is efiected by the modification shown in Figs. 5 and 6. In said modification the soft main roller 1 is movably supported between the driven roller 3 and the other roller 2. The roller 1 is pulled upward by the spring 7 so that the center of the roller is somewhat above the central line of the

rollers

2 and 3 when the pressure acting upon the rollers is released (Fig. 5). The distance between the two rollers and 3 is somewhat shorter than the diameter of the roller 1.

WVhen the roller 3 is rotated in the direction of the arrow, the roller 1 by mutual friction of the rollers is pulled into the space between the

rollers

2 and 3, whereby the rollers are compressed and the spring 7 is stretched (Fig. 6). When the rotation of the rollers ceases, the compression of the rollers is automatically released by the action of the spring 7 and the elasticity of the rollers (Fig. 5).

The spring 7 may if desired be replaced by any other force, for instance a weight. By suitably arranging the rollers, a combination may be obtained wherein no additional force is necessary and the spring 7 is then replaced by the weight of one or more of the rollers.

To attain said automatic release of pressure in machines in which the central line of the rollers forms a broken line, so that the centers of said rollers are in a triangu' lar position, the addition of one or more auxiliary rollers or disks or the like is required.

In the modifications of Figs. 13, the compression of the rollers is immediately released not only when the operator takes his hand ofl the driving crank, but also when this crank is rotated in the reverse direction. This however is not always desirable, because it is sometimes required by a stop when the rollers are again rotated in the normal direction.

Of course, all modifications of the new machine can be driven by a motor instead 01 by hand. In this case the machines are preferably arranged so that the force which causes the release of compression of the rollers does not rotate the gear inserted between the motor and the rollers.

The automatic compression of the rollers can also be effected by a finger or trigger sliding on the letters to be copied, said finger or trigger causing the release of compression, when the feeding of the letters is interrupted for an appreciable interval of time. When the machine is driven by an electric motor, said finger can also be used to cut oflf the current supply for the operation and, if desired, also for the heating of the machine.

What I claim and desire to secure by Letters Patent of the United States is 1. A roller-copying machine comprising in combination a plurality of rollers, means for driving same and means for automatically releasing the compression of the rollers, when the driving force ceases.

2. A roller-copying machine comprising in combination a plurality of rollers, means for driving same, and means for accumulating a part of the driving force, the latter means being so arranged that the accumulated force causes an automatic release of the compression of the rollers when the driving force ceases.

3. A roller-copying machine comprising in combination a plurality of rollers, means for driving same, and a spring tensioned by the driving means, said spring causing an automatic release of the compression of the rollers when the driving force ceases.

4. A roller-copying machine comprising in combination a plurality of rollers, means for driving and pressing same against each other by the movement of said driving means, means for accumulating a part of the driving force, the latter means being so arranged that the accumulated force causes an automatic release of the compression of the rollers when the driving force ceases.

5. A roller-copying machine comprising in combination a plurality of rollers, means for driving and pressing same against each other by the movement of said driving means, a spring tensioned by said driving I in combination a plurality of rollers, a

roller in-contaot with the aforesaid rollers adapted to be bodily displaced thereby so that its-weight will become operative to it release the compression of .the' rollers when 7 the ma'chineis stopped. or r In witness whereof I have hereunto set my hand in the'pre'sence of two witnesses. EDMUND LIGHTENSTEIN, Witnesses;v i HENRY HAsrmg- ARTHUR SoHRoEDER.

Copies of this patent may be obtained for five cents each; by addressingthe Gomxni ssioner of Patents;

Washington, D. 0.?" 7 i