US2692036A - Paper feeding mechanism for adding machines or the like - Google Patents

Description

Get. 19, 1954 A. E. UDDGREN 2,592,036

PAPER FEEDING MECHANISM FOR ADDING MACHINES OR THE LIKE Filed May 21, 1951 5 Sheets-Sheet l //v YEA/TOE ALBERT f/NAF? UDQGREM ATTORNEYS Oct. 19, 1954 A, E. UDDGREN PAPER FEEDING MECHANISM FOR ADDING MACHINES OR THE LIKE 3 Sheets-Sheet 2 Filed May 21, 1951 A r-romvz 7.5

Oct. 19, 1954 A. E. UDDGREN PAPER FEEDING MECHANISM FOR ADDING MACHINES OR THE LIKE 5 Sheets-Sheet 5 Filed May 21, 1951 In VENTOR ALBERT E'iNAI? UDDGREN By M i ATTORNEYS Patented Oct. 19, 1954 UNITED STATES ATENT OFFICE PAPER FEEDING MECHANISM FOR ADDING MACHINES OR THE LIKE Application May 21, 1951, Serial No. 227,291 Claims priority, application Sweden June 1, 1950 3 Claims. -1

This invention refers to a paper feeding mechanism for the record strip of adding machines and the like, and it relates particularly to such paper feeding devices which normally feed a paper roller one or two (or more) steps dependent on the setting of a manually operated line spacing lever and which shift automatically from single line (one step) feeding to two line (double) feeding or multiple line feeding when certain keys are depressed, usually the total-taking keys (the total and subtotal keys). This results in the effect that different groups of figures (items) or sums (totals) are separated by one or more additional spaces between the lines, and this renders the calculation and reading more easy.

However, mechanisms of this kind as hitherto known, work according to the principle that the same feeding hook feeds a feeding wheel secured to the paper roller one, two or more steps respectively at a time. At two line feeding or multiple line feeding, however, that principle has the disadvantage that the feeding speed of the paper roller becomes so high, particularly in the case of rapidly electrically operated machines with large rollers, that there is a risk that owing to its inertia the roller is over-rotated so that the feeding becomes irregular.

The mechanism according to this invention eliminates this risk of irregular feeding at high speed (high numbers of revolutions) and it is substantially characterized in that two different feeding hooks are arranged to cause the roller to be turned forward by two different operations for double line feeding (multiple line feeding), one of these feeding hooks being kept inactive at single line feeding, while the second hook is arranged to feed the roll one step both at single line feeding and at two (double) line feeding.

Thus, by this method the longer feeding is carried out by two different operations, and due to this the maximum rotary speed of the paper roller does not reach such a high value that the feeding becomes irregular. Overthrow or excessive feeding is prevented. The paper is fed more noiselessly by means of the mechanism according to the invention, as compared with the prior feeding by one single operation. Besides, as the movements of the feeding members are short, the mechanism is more compact than the devices heretofore known for single line feeding or two line feeding.

A preferrerd embodiment of the mechanism in accordance with the invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 shows a perspective view with the various members drawn axially apart for the sake of clearness. The members are shown in the position they have when the machine is manually set for double line feeding.

Fig. 2 shows the same view, the members being in the position they have when the machine is set for single line feeding.

Fig. 3 shows the same members set for single line feeding and exactly in the position they have when a total is taken and consequently an additional line feeding is taking place.

Referring now to the drawings the numeral 1 designates the paper roller which is rigidly secured to a shaft 2 rotatably journalled in the end walls (not shown) of the paper carriage. A line feeding wheel 3 is also secured (keyed) to the shaft 2 and is driven by two feeding hooks 4 and 5. The feeding hook feeds the line feeding wheel 3 one single step at each machine cycle independent of the setting of a line spacing 1ever 6. Said feeding hook 4 is driven in the usual manner by a device (transmission) which transfers motion from the main shaft of the machine.

The feeding hook 5 is swingabiy mounted on a rod or shaft rigidly secured to a feeding crank 8, which is rotatably mounted on the shaft 2 of the paper roller. Further, the feeding hook 5 is rigidly secured to a shaft or pin 9 which is acted upon by a spring i5. At its other end said spring is secured to a pin ii on a cam disc l2, and thus the spring it presses the shaft 9 against the edge of the cam disc 2. The latter is rotatably mounted on a pivot 93 in one of the end walls (not shown) of the carriage.

The feeding crank 23 is provided with an aperture 14, so that the shaft 9 has a considerable play therein. To said feeding crank a shaft 55 is also secured on which a roller i9 is rotatably mounted. The outer end of the shaft i5 is acted upon by a spring i'i which at its other end is secured to a pin it on the cam disc l2. The spring 5'! tends to draw the feeding crank 8 into such a position that the edge of the aperture 24 rests against the shaft which is presesd to the right by the edge of the cam disc i2, thus keeping the hook 5 disengaged from the feeding wheel 3.

To the line spacing lever B a pin 99 is secured which runs in a curved slot (cam slot) 28 in the cam disc i2. Said slot has two setting positions 2i and 22 for the pin l9.

The cam disc i2 also carries a rotatably mounted roller 23 which, in total-taking operations, is actuated by an actuating member 24 which is moved when the respective total-taking key is pressed down.

The roller I6 is acted upon by an actuating member 25, which actuates the roller at each machine cycle independently of how the line spacing is set, or which operating key has been depressed.

The device .described above functions in the following manner.

When the machine is set to single line feeding by means of the lever B, the various members assume the position shown in Fig. 2. The pin IS on the line spacing lever 6 is then in the recess 22 of the cam disc 12 and at the machine cycle the actuating member 25 moves upwards and actuates the roller l6 and thus also the shaft and the feeding crank 8 which is swung counterclockwise and moves the shaft ,1 and the feeding hook 5 mounted thereon. During this motion the shaft 9 is held against the cam disk l2 and, in fact, in the notch therein. However, the radial distance from the pivot I3 to the bottom of the notch is greater than the radial distance from the pin to the adjacent portion of the cam disk l2 (against which the shaft 9 rests in the Figure 2 position.) Thus at this time the feeding hook 5 is held away from the teeth of wheel 3. As the movement of actuating member 25 starts, the shaft 9 moves over the upper curved surface of cam disk 12 which curve is, in this, position of the cam, concentric with shaft 2. Consequently, feeding hook 5 retains its position relative to the feeding crank 8 and therefore no feeding action is performed by the hook 5 during the oscillation of the feeding crank 8.

When the lever 6 is set so that pin 19 is in recess 2| of the cam disk l2 a double feeding action occurs. In this case the curved upper cam surface of member l2 has been moved to the left as seen in Figure 1 and spring is now effective to hold shaft 9 against the side of theaperture M in the feeding crank 8.v This prevents the shaft 9 from making contact with the cam l2 and permits the feeding hook 5 to rotate about the pin "I so that the end thereof is in contact with the feeding wheel 3 during the oscillation of the actuating member 25. Consequently the feeding hook 5 causes rotation of the feed wheel 3 through one tooth step.

In this machine cycle, however, the feeding hook 4 effects a single line feeding, and this may be effected either before or after the feeding motion of the hook 5. The feeding by means of the hook 4 must evidently be effected after the printing. It should perhaps be pointed out that in certain cases it is desirable that the feeding by means of the hook 5 takes place before the printing, and in such case there is obtained a printing picture of thesame kind as in machines with obligatory interlinear spacing effected before the total-taking and sub-total taking, that is, on the printing slip first the items entered, then an additional spacing, and finally the sum (total) come. The double-line spacing to be effected, when the machine is set manually to double-line feeding, is then effected in such manner that after the printing of one item the hook 4 feeds,

the paper slip one step and at the next machine 4 cycle the hook 5 feeds the second step before the printing of the next item.

When the machine is set to single line feeding and a total-taking key is depressed, the members assume the position shown in Fig. 3. At the machine cycle the actuating member 24 is then released, which is swung upwards and actuates the roller 23 and thus also the cam disc I2 which is now swung into the same position as when the machine is set to double line feeding. The line feeding in two steps is then effected in the manner described above. When the line feeding has been effected the actuating member 24 returns to its initial position and also the cam disc l2 returns to its normal position in the recess 22, for single-step feeding.

, The elements of the machine can be varied in several ways within the scope of the following claims.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is: v

1. In a device for effecting line spacing operations of a record sheet for calculating machines and the like, in combination, a record sheet roller, a line spacing ratchet wheel fixed to said roller, a pair of feeding hooks adapted to cooperate with said ratchet wheel, a feed crank, means pivotally mounting one of said feeding hooks on said feed crank, cam means pivotally mounted on a fixed portion of the record sheet roller support, means actuated by said cam means to render said one feeding hook effective to operate said ratchet wheel in one position of said cam means, a lever manually settableto position said' 'cam means for effective operation of said feeding hook, a second lever operable by predetermined ones of the machine keys to set said cam means for effective operation of said feeding hook, and means for operating the other of said pair of feeding hooks at each machine cycle whereby said record sheet roller is normally advanced one line space, but when one of said predetermined operating keys or said manually settable lever is operated an additional line spacing operation is performed.

2. A device as claimed in claim 1, characterized in that said manually'settable lever is pivotally mounted on the record sheet roller shaft and said cam means comprises a cam disk provided with a slot having a recess at each end thereof,and a pin is mounted on said lever, said pin enteringsaid slot and cooperating with said recesses to determine the position of said cam disk.

3. A device as claimed in claim 1, characterized in that said cam means comprises a cam disk having a roller thereon and said second lever cooperates with said roller to set said cam disk to effective position.

' References Citedin the file of-this patent A I UNITED STATES PATENTS Number 2,000,218 Carroll May 7, 1935

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