US2682994A

US2682994A - Recording and paper feed control

Info

Publication number: US2682994A
Authority: US
Publication date: 1954-07-06
Anticipated expiration: 1971-07-06

Description

Filed Sept. lO, 1951 '7 Sheets-Sheet l July 6, 1954 R. E. BoYDr-:N ETAL 2,682,994

RECORDING AND PAPER FEED CONTROL MECHANISM l JF Il -Mll INVENTOR. Rober EQo/qden,

BY rgan F. Hahne,

Uiharon H.Paz5on5 ATTORNEY.

July 6, 1954 R. E. BOYDEN ET AL RECORDING AND PAPER FEED CONTROL MECHANISM .'7 Sheets sheeIt 2 Filed sept- M f N R. m e, m m 01a n.nt T l T UMH a TQ N m; [M N o u P. A WON@ lilin n mi frm Bwj u... W a a July 6, 1954 R. E. BoYDl-:N ET AL RECORDING AND PAPER FEED CONTROL. MECHANISM 7 Sheets-Sheet .5

Filed Sept. l0 1951 eq m: [M

July 6, 1954 R. E. BOYDEN ET AL RECORDING AND PAPER FEED CONTROL MECHANISM '7 Sheets-Sheet 4 Filed Sept.

F H Kuden" e, 32% n ZX W INVENTOR. Rober E. Bo

Tyra Ons ATTORNE `July 6, 19,54 R. E. BOYDEN ET AL RECORDING AND PAPER REED CONTROL MEOHANISM 7 Sheets-Sheet 5 Filed Sept. lO 1951 mgm H ,M

I INVENTOR. Rcber Eoyden, BY ,Bryan E Hahne,

wharoryarsos W a ATTORNEY.

July 6, 1954 R. E. BOYDEN ET AL RECORDING ANO PAPER REED CONTROL MECHANISN 7 Sheets-Sheet 6 July 6, 1954 R. E. BOYDEN ET AL RECORDING AND PAPER FEED CONTROL MEOHANISM '7 Sheets-Sheet 7 Filed sept. 1o, 1951 oyden, ,Bryan F. Kahne whazyfarsons l ATTORNEY.

INVENTOR. Robert E.

Patented July 6, 1954 UNITED STATES PATENT OFFICE RECORDINGKAN D PAPER FEED CONTROL llIECHANISM of California Application September 10, 1951, Serial No. 245,794

4 Claims. 1

In instances where a considerable number of multiplication problems as well as additions and subtractions are performed, it is a usual practice to utilize key responsive, non-listing adding or calculating machines wherein the multiplicand factor of a multiplication problem, for example, is successively entered into the machine a number of times equal to the value of each multiplier digit, the product thus appearing on visible accumulator dials. Although such machines are satisfactory, the result must be transcribed onto paper by the operator for record purposes, resulting in a certain loss of time and possible chance of error.

In order to overcome this above-noted defect, conventional -adding-listing machines are often used instead, the latter printing each factor as it is entered into the machine and also the totals or sub-totals. Although this is also satisfactory and often desirable when recording the factors of addition and subtraction problems, it causes considerable annoyance and waste of paper in recording multiplication and division problems in that the multiplicand factor, for example, is

printed as an incident to each successive entry thereof in order to obtain the product.

Although non-print controls have been provided heretofore for selectively rendering the printing mechanism ineffective for certain operations, such controls must be manually reset during totaling in order to record the product of a multiplication operation or, if the controls are automatically retracted upon totaling, they must be again reset in order to continue further and successive multiplication operations.

It therefore becomes the principal object of the present invention to overcome the above noted defects of prior machines.

Another object is to control the printing mechanism of a listing machine of the above type in accordance with the type of operation of the machine.

Another object is to selectively control the printing mechanism of a listing machine to operate invariably or to operate in accordance with the type of operation performed by the machine.

Another object is to selectively set a listing machine of the above type to list all factors and totals or to list totals only.

A still further object is to automatically control the spacing or non-spacing of paper relative to the printing mechanism in accordance with the type of problem and the setting of printing mechanism controls.

The manner in which the above and other obl jects of the invention are accomplished will be zascoen readily understood on reference to the following specication when read in conjunction with the accompanying drawings, wherein:

Fig. 1 is a plan view of a calculating machine embodying the present invention.

Fig. 2 is a longitudinal sectional elevation taken approximatelyon line 2-2 of Fig. 1 and illustrating the keyboard, rack, accumulator and printing mechanisms.

Fig. 3 is a sectional elevation illustrating the printer control knob and associated parts set in the multiply position and showing the parts prior to beginning of a machine cycle.

Fig. 4 is a sectional elevation of the total and sub-total bars and their connection to the printer control mechanism.

Fig. 5 is a sectional elevation of the non-add bar and its connection to the printer control mechanism.

Fig. 6 is a View similar to Fig. 5 but showing the non-add bar depressed and the printer control mechanisms set thereby.

Fig. '7 is a View similar to Fig. 3 but showing the printer control kob set to add position and showing the machine at the printing phase of its cycle.

Fig. 8 is a view somewhat similar to Fig. 5 but showing the machine partially cycled and with the printer control mechanism set for printing under control of the total bar.

Fig. 9 is a sectional elevation illustrating certain parts of the printing mechanism in normal position as set by the control knob when moved to its add position shown in Fig. 7 and prior to the beginning of a machine cycle.

Fig. 10 is a view similar to Fig. 9 but illustrating the machine near the end of a cycle.

The particular embodiment of the invention disclosed herein is applied to the well-known and commercially available Clary a-dding machine of which various operating instrumentalities are disclosed and claimed in the copending application of R. E. Boyden, S. N. 582,553, filed March 13, 1945 (since matured into Patent 2,583,810 issued on January 29, 1933)` and in the patent to E. P. Drake, 2,472,696, issued June '7, 1949, wherein is disclosed and claimed the accumulator structure partially illustrated herein. Therefore, reference may be had to said application and patent for a Idisclosure of parts and details not specifically disclosed herein.

General arrangement Referring to Fig. 1, the machine comprises in general a computing section enclosed by a cover II provided with suitable openings I2, I3 and I4 for a roll of paper, a printing device and a platen operating knob I5, respectively. Another opening is provided in the cover Il for a keyboard comprising amount keys I6 whereby amounts are set up to be entered into the machine. Additive entry of amounts set up on the keyboard may be eiected by depression of either f two add bars I3'.

Total bars I8 and a sub-total bar I9 are provided to total or sub-total amounts stored in the accumulator which is generally indicated at 2B (Fig. 2)

Depression of a repeat bar will additively and repetitively enter any amount set up by the keys IS into the accumulator without clearing the keyboard so long as the bar 2li is held depressed.

A non-add bar 2I is provided to permit printing of an amount set up by the keys I6 without en tering the said amount into the accumulator. A subtract bar 22 is provided to subtract or divide amounts set in the keyboard from amounts registered in the accumulator.

Also extending through an opening in the cover I I is a control knob 23 peculiar to the present invention whereby the printer is preconditioned to operate in different selected manners.

Drive and racks The machine includes a main shaft 25 which is motor driven through a cyclic clutch (not shown) under control of the various depressible bars il to 22, inclusive. Depression of any such bar engages the clutch and starts a cycle of operation of the machine including one complete rotation of the shaft 25.

The shaft 25 will (through means not shown) effectively mesh the gears of the accumulator 2t with a series of differentially operable dual purpose racks 2l, each having an upper and a lower set of

rack teeth

28 and 29, respectively. The racks 2l are differentially advanced by drive means hereinafter described until arrested by depressed ones of the amount keys I5. The racks are also retracted by the same drive means and are guided for fore and aft movement by a aft of the machine, by the drive shaft 25 (through means not shown) and is yieldably connected to each rack by pairs of opposed drive latches 3ft and 35. Each latch is pivotally mounted on the rod Sii and is provided with a roller 36 normally seated in a lateral depression or notch 5l formed at the closed end of the slot 32 in the respective rack.

The rollers 36 are normally urged apart and held in driving engagement with the notches 3l by a spring 38 extending between the tails of the

latches

34 and 35 luntil the respective rack is arrested by an associated depressed key I6 or a zero block 39 at which instant the rollers 3S ride out of the notches 3l' and along the slot 32, thereby permitting the rod 3c to continue forward to carry along `any other unrestricted rack.

The racks 21 are provided with a. series of shoulders l2 spaced apart distances slightly greater than the spacing between the stems of the amount keys I6 whereby, when a rack is advanced until arrested by `a depressed one of the associated amount keys, it will move a number of increments equal to the value of the depressed key.

Normally, when no key in an order is de- Dressed, its associated rack 2l will be blocked from advancement by the zero block 3s carried by a key controlled latch-bar 43. Said zero lock is normally positioned directly in front of one of the shoulders 42. However, upon the depression or" an associated key I6, the stem thereof will slide vertically along aligned slots in two spaced key plates i4 and 45 and a camming projection or lug (not shown) thereon will become eiective to move the zero block out of cooperative engagement with the shoulder 42, permitting the rack to be advanced forward until arrested by the striking of the proper shoulder l2 against the depressed key stem.

Accumulator As disclosed in the aforementioned Drake Patent 2,472,696, the accumulator includes ordinally arranged gears l0 rotatably journaled upon a shaft lli and positioned to mesh with either the upper set of rack teeth 28 or the lower set of rack teeth 29 on the respective racks, thereby to additively enter into or subtractively remove from the accumulator amounts set up on the keys I6.

The accumulator is normally held in a neutral position (as shown in Fig. 2) wherein the gears :l0 thereof are located out of mesh with both sets or rack teeth 29 and. 29 until moved into mesh by mechanism (not shown) under the control of the various depressible bars I 'I to 22, inclusive.

Amounts set up on the keys IE are added into the accumulator by the depression of the bar I'I whereupon the gears '4U are raised into mesh with the teeth 28 and then the racks 2l are moved forward (to the left in Fis. 2) until stopped by the stems of depressed` keys It. The gears lil are then lowered into their neutral positions prior to the return of the racks 27, leaving the added amount in the accumulator.

Amounts `are similarly subtracted from the accumulator by depression of the subtract bar 22 -whereupon the gears are lowered into mesh with the teeth 29 prior to the forward movement of the racks and are raised into their neutral positions prior to the return of the racks.

Printer The upper edge of each rack 2l is formed with a set of rack teeth 4B arranged in mesh with a pinion 4l positioned to drive a respective one of an ordinally arranged series of idler gears 48 independently journaled on a rod 43a. Pinions 49 are respectively entrained with other racks il? and other idler gears 43.

The printer is provided with a series of print-- ing dials 5l) each having a series of type charac ters formed around 'the periphery thereof. Each dial 5I) is loosely journaled on a stud 5i carried by a respective lever 52 loosely keyed on a printer control rock shaft 5S. A spring 52a urges the lever 52 toward a paper supporting platen |46 but the lever is normally restrained from such movement by the rock shaft 53.

A pinion `54 fixed to each dial 53 is continuously entrained with a pinion 55 loosely journaled on a stud carried by the respective lever the pinion 55 being aligned to mesh with a respective gear 48 thereby completing a train of gears connecting each rack with a respective dial whereby any movement of a rack 2'I to digitize an associated accumulator gear 49 will correspondingly digitize its respective dial 50.

A full explanation of the printing mechanism and its movement during a machine cycle may be had by reference to Patent No. 2,515,692, issued July-18, 1950, to R. E. Boyden et al., said disclosed mechanism including a rock shaft 302 similar to the rock shaft 53 illustrated in the present disclosure.

Printer control Normally, the shaft 53 is rocked clockwise during the printing phase of a cycle t provide leeway for a spring-urged snap printing action of the levers 52 under the urge of their springs'52a.

Mechanism for blocking the normal action of the shaft 53 in the present invention includes a pin 56 (Figs. 3 and 7) fixed on an arm of a dust cover lever 51 loosely `iournaled on the shaft 53 and urged clockwise by a spring 58. Another arm of the lever 51 is provided with an arcuate slot 59 embracing a pin 50 carried on a leg of a printer dust cover 6| pivoted on a xed pin 62.

A link B3 connects the lever 51 to a cam follower 64 journaled on a rod B5 fixed in the side frames (not shown) of the machine. The cam follower is provided at its other end with a roller 66 spring urged against a cam 61 keyed on the shaft 25.

A second cam 68, also keyed on the shaft 25. acts upon a roller 69 carried o'n a cam follower 10 journaled on the rod 65. An arm 1| is adjustably secured on the cam follower 10 by a screw and slot connection 12. A roller 13 positioned in the path of the arm 1| is carried on one arm of a three-armed lever 14 suitably fixed on one end of the shaft 53. The latter lever is urged clockwise by a spring 15 having one end attached thereto at 16. An arm of the lever 14 is provided with a cam like face 11 located directly below the pin 60.

When the machine is in its full cycle position illustrated in Fig. 3, the cam 68 is effective to hold the cam follower 10 in a clockwise rocked position and the latter, in turn, maintains the lever 14 and printer shaft 53 rocked counterclockwise against the action of spring 15 to mesh the pinions 55 with the idler gears 48. In machine operations wherein the printer control knob 23 has been set in its add position shown in Fig. 7, the cam 68 will, when the printing phase of the cycle is reached, allow the cam follower 10 and lever 14 to be rocked by spring 15 s0 as to rock the printer control shaft 53 and allow the printer levers 52 to be actuated by their` indiviclual springs 52a, causing a printing operation to occur.

The control knob 23 is integrally mounted on a control knob plate 80 pivotally supported on a frame pin 8|. The knob is yieldably maintained in either its add position shown in Fig. '7 or its "multiply position shown in Fig. 3 by a centralizer pawl 8,2. The latter is pivoted on a frame pin 83 and is urged counter-clockwise byva spring 82a to maintain a roller 18 thereon in engagement with either one of two detenting notches 19 formed on the control knob plate 80.

The plate 80 carries a, pin 84 having a slot connection with one leg of a bail B pivoted on a frame supported rod 53. The other leg of the bail 85 is provided with a pin 81 adapted to thrust against a bail 88 also pivoted on the rod 86 and spring urged clockwise as will be described later.

The bail 88 has one leg adapted to be moved into blocking relationship with the pin 55, as shown in Fig. 3, to prevent clockwise rocking of the lever 51. Thus, when the control knob 2-3 is moved from its add to its multiply position,

it win rock the han 85 clockwise causing pin s1 to recede from the bail 88 whereby the latter may move into blocking relation with the pin 56 as shown in Fig. 3. Assuming the bail to be so located, when the cam 68 reaches the position shown in Fig. 7 wherein the printing operation would normally take place, the lever 51, which is now blocked in a counter-clockwise rocked position, will, through pin 60, likewise retain the lever 14 and shaft 53 from rocking clockwise under the action of spring 15, thereby preventing actuation of the printing mechanism. This control of the printing operation, however, is superseded during totaling and non-add operations as will appear hereinafter.

The leg 88a (Figs. 5, 6, 8, 9 and 10) of the bail 88 has an arm 89 having a pin 90 fixed thereto and pivotally carrying one end of a link 9| pivotally connected by a pin 92 at the other end to a bell-crank 93 pivoted upon a frame pin 84. A spring 95 will, through the link 9|, urge the bail 88 clockwise against the pin 81, thus causing the bail 88 to normally follow the setting of the bail B5.

,Howeven the bell-crank 93 4may be moved clockwise against the urging of the spring 95 by a pin 96 carried on a plural armed bell-crank 81 pivoted up-on a frame pin `98. Another pin 99 carried by the bell-crank 31 is adapted to engage a platen ladvancing pawl |00 having one end Ipivoted at 10| (Figs. 5 and 8) to a cam follower |02 actuated by a cam |02a on the shaft 25. The pawl |063 is provided with a' bent over hook |03 adapted to engage the teeth of a printing-platen ratchet wheel E04 integral with the platen hit. A spring |05 attached at one-end to an arm of the bellcrank 91 and at the other end to a lug on the pawl |03 provides a clockwise urge to the crank 91 and a counter-clockwise urge to the pawl |08 whereby to normally maintain the pawl |051.

against the pin 89. A frame pin |01 limits clockwise movement of the bell-crank 91.

The bell-crank Si is settable from the position shown in Figs. 9 and 10 wherein it enables the pawl |08 to engage and drive the ratchet It@ a single tooth space to that shown in Fig. 8 wherein the bell-crank enables the pawl |00 to drive the ratchet |04 three tooth spaces. This setting oi the bell-crank 9i is effected under control of the total and sub-total keys I8 and I9. Thus, the paper is advanced a greater distance as an incident to a totaling or sub-totaling operation. For this purpose, the bell-crank 91 has a pin |83 connecting with a slot in one leg of a bail |09 pivoted upon the rod and having a pin i i8 in the other leg adapted to be engaged by a hook H! of a iioating lever ||2 hereinafter described.

In the conventional adding machine, a pawl H3 (Figs. `5, 6, 8, 9 and l0) pivoted at Il@ to the bell-crank |02 normally engages and advances a ribbon feeding ratchet wheel l5 but is prevented from such engagement at certain times in accordance with the present invention as will be described presently. A spring ||1 normally urges the pawl i I3 into engagement with the wheel i i5,

The ratchet wheel H5 is integral with a gear 200 which meshes with a second gear 23| integrally connected to a printing ribbon spool EQ2 on which is wound a printing ribbon 203. The latter is passed around ribbon guides 284, 265 and 238 to a point where it extends across the platen E46 directly behind the printing dial 50. A similar spool arrangement (not shown) is provided on the opposite side of the machine, on which is mounted the opposite end of the ribbon.

A pin ||6 is mounted on the arm 89 of bail 88 and underlies the feed pawl I I3. Thus, when the bail 88 is rocked clockwise, to effect blocking of the printer shaft 53, the pin IIS will raise the pawl ||3, as illustrated in Fig. 5, out of engagement with the ratchet II to disable the ribbon feed.

The aforementioned pin 9U on the arm 8G of bail 88 also engages a slot I I8 in `one leg of a bail I I9 pivoted upon a frame supported rod |28 and having another leg carrying a pin I2| adapted to be engaged by one end of a lever |22 (Figs. 5 and 6) pivoted on a frame pin |23. The pin i2 has no engagement with any other member. The lever |22 is engaged at its other end by a slot connection |24 with a pin |25 carried conventionally by a non-add bell-crank |26 whereby the nonadd bar 2|, when depressed, moves the crank Id and lever |22, thereby through the pin i2 l, rocking the bail `I I9 clockwise. The latter, through the pin 98, rocks the bail 88 counter-clockwise against the action of spring 95 even though the control knob 23 may be set in its multiply position whereby to lower the pin IIB away from the pawl H3 so that the latter may effectively enm gage the ratchet I I5. Obviously, the blocking leg of bail 88 is also moved out of engagement with the pin 56 of lever 5I so that the printer mechanism may function. Said counter-clockwise movement of the arm 89 also moves a pin l23 carried by the bail leg 88a away from the pawl |80 which is thus moved by the spring It?, into driving relation with the platen ratchet lil-4i.

A similar restoration of the printing and ribbon I feeding mechanisms is effected by depression of either the total bar I8 or the subtotal bar I9. The latter engage pins |29 carried by respective pivoted arms |80. and |9a which are spring urged upward in a manner not shown in order to normally hold the bars I8 and I9 in raised position. The pins |29 are connected to and support opposite ends 0f a link |30 having a pin I3I intermediate its ends and engaging a slot |32 in one end of a link |33. This link is pivoted on a pin |34 carried at the left end of the floating lever I|2.

It is necessary during totaling and sub-totaling operations to return the accumulator to its zero position and the lever ||2 is part of the conventional mechanism for rocking a zero stop shaft Y |35 carrying various zero stops into cooperative relation to the accumulator. For this purpose, the lever I2 is connected, through a pin and slot connection I3'I to an arm |38 fastened to the shaft |35. The lever ||2 is slidably fuln crumed over a frame pin |38 and, a shouider |39 near its right hand end is raised, upon depression of either the total or sub-total bar, int-o the path of a pin |48 carried by a cam follower Ifll pivoted on the rod 65. The latter cam follower also has a pin connection |42 with a hook M3 provided to raise or lowerthe accumulator in a manner not shown.

The follower |4| is rocked clockwise against the action of a spring |45 by a cam |44 keyed on the shaft 25, thereby causing the pin Iii@ to move the lever I I2 to the left. During such movement, the hook III onu the lever II2 engages the pin II to rock the bail |89 clockwise which, through the pins |88 and 98 on the crank 3l, rocks the bell-crank 93 clockwise, the link 9| and the pin 8c thereby rocking the bail 88 counter-clockwise against the action of the spring 95 to the position seen in Fig. 7 wherein it is ineffective to block the printer from operation.

During a "total operation, and after the bai" I8 has been depressed, there is a point in the machine cycle where the roller on the cam follower I4| is urged by the spring |45 into the low part of the cam |44 thereby retracting the hook III away from the pin I I0. This is prior to the spacing of the paper by the platen |46 due to the irnpulse imparted by the pawl |80. Therefore, provision is made by means of a hook |111 (Figs. 4 and 8) for retaining the pin I Il) in the position shown in Fig. 8. Otherwise, the combined action of the spring 85, the spring |05 and the pin |28 would be to push the pawl I into either the extreme position seen in Fig. 5 Where it would be ineffective to actuate the platen or into the single space position seen in Figs. 9 and 10 depending, respectively, on whether the knob 23 was in its multiply position shown in Fig. 3 or in its add position shown in Fig. '7.

Therefore, as the short cam IM and its iolu lower |4| allows the hook I I I to move away from` the pin I Il the follower ISI will continue to ride the high portion of the cam |52 causing the pin |49 to bear against the bottom of the slot IS thereby maintaining the hook |47 in lool-:ing contact with the pin I I0 until after the pawl I im has rotated the platen |46.

Further description of the conventional function of the cams |45 and |52 and other associated parts is not deemed necessary for an understanding of the present invention, as reference may be had to the same in the aforesaid Boyden Patent 2,583,810.

Fig. 9 and Fig. l0 of the present drawings show the position of the parts in difierent cyclic positions when the knob 23 has been set to its add position shown in Fig. '7 wherein the parts are set for printing as an incident to each type or operation, i. e., add, subtract, non-add, totaling and sub-totaling.

Having thus described the invention, what we desire to secureby United States Letters Fatent. is:

l. In a calculating machine, the combination of registering mechanism, paper feeding mechanism including a paper feeding element, print-- ing mechanism for printing amounts on paper fed by said element, differential actuators for actuating said registering mechanism and for setting said printing mechanism, means for actuating said printing mechanism to print amounts set thereon, a ratchet operatively connected to said paper feeding element, a pawl for advancingsaid ratchet, means responsive to operation of said machine for operating said pawl. through a uniform stroke, amount entry control means for causing said actuators amounts into said registering mechanism, means responsive to said last-mentioned means for causing .said pawl to engage said ratchet at a predetermined tooth position whereby to pawl to advance said paper feeding element predetermined amount, totalling controi means for causing said actuators to take totals from said registering mechanism, means responsive to said last-mentioned means for causing said pawl to engage said ratchet at a dierent tooth posi tion whereby to enable said pawl to advance said to enter4 paper feeding element a different amount` and printing control means selectively settable in one condition for rendering said actuating means invariably operable, said printing control means being settable in a second condition for rendering said printing mechanism actuating means operable during cperation of said totalling control means and for rendering said printing mechanism actuating means inoperable during operation of said amount entry control means, said printing control means being effective when set in said second condition to prevent said pawl from engaging said ratchet during operation of said amount entry control means and to enable said pawl to engage said ratchet during operation of said totalling control means.

2. In a calculating machine, the combination of registering mechanism, paper feeding mechanism including a paper feeding element, a printing mechanism for printing amounts onpaper fed by said element, differential actuators for actuating said registering mechanism and for setting said printing mechanism, means for actuating said printing mechanism to print amounts set thereon, a ratchet operatively connected to said paper feeding element, a pawl for advancing said ratchet, means responsive to operation of said machine for operating said pawl through a uniform stroke, amount entry control means for causing said actuators to enter amounts into said registering mechanism, means responsive to said amount entry control means for causing said pawl to engage said ratchet at a predetermined tooth position whereby to enable said pawl to advance said paper feeding element a predetermined aincnrit, totalling control means, means responsive to said totalling control means for causing said actuators to take totals from said registering mechanism, means responsive to said totalling control means for causing said pawl to engage said ratchet at a different tooth position whereby tc enable said pawl to advance said paper feeding element a different amount, disabling for preventing operation of said printing mechanism actuating means and for preventing said pawl from engaging said ratchet, spring means for rendering said disabling means effective, printing control means selectively settable in one condition to render said disabling means ineffective, said printing control means being settable in a second condition enabling said spring means to render said disabling means effective, and means controlled by said totalling control means for invariably rendering ysaid disabling means ineffective regardless of the setting of said printing control means.,

3. In a calculating machine, the combination of a registering mechanism, Y paper feeding mechanism including a paper feeding element, a printing mechanism for printing amounts on paper fed by said element, differential actuators for actuating said registering mechanism and for setting said printing mechanism, yieldable means for actuating said printing mechanism to print amounts set thereon, a ratchet operatively connected to said paper feeding element, a pawl for advancing said ratchet, means responsive to operation of said machine for operating said pawl through a uniform stroke, amount entry control means for causing said actuators to enter amounts into said registering mechanism, means responsive to said last-mentioned means for causing said pawl to engage said ratchet at a pre- 10 determined tooth position whereby to enable said pawl to advance said paper feeding element a predetermined amount, totalling control means for causing said actuators to take totals from said registering mechanism, means responsive to said totalling control means for causing said pawl to engage said ratchet at a different tooth position whereby to enable said pawl to advance said paper feeding element a diiferent amount, printing control means selectively settable in a first condition for blocking said actuating means from operation and for preventing said pawl from engaging said ratchet, said printing control means being settable in a second condition for unblocking said actuating means and for enabling said pawl to engage said ratchet, and means controlled by said totalling control means for invariably causing said printing control means to unblock said actuating means and to enable said pawl to engage said ratchet.

4. In a calculating machine, the combination of a registering mechanism, paper feeding mechanism including a paper feeding element, a printing mechanism for printing amounts on paper fed by said element, diierential actuators for actuating said registering mechanism and for setting said printing mechanism, yieldable means for actuating said printing mechanism to print amounts set thereon, a ratchet operatively connected to said paper feeding element, a pawl for advancing said ratchet, means responsive to operation of said machine for operating said pawl through a uniform stroke, amount entry control means for causing said actuators to enter amounts into said registering mechanism, means responsive to said last-mentioned means for causing said pawl to engage said ratchet at a predetermined tooth position Whereby to enable said pawl to advance said paper feeding element a predetermined amount, totalling control means for causing said actuators to take totals from said registering mechanism, means responsive to said totalling control means for causing said pawl to engage said ratchet at a different tooth position whereby to enable said pawl to advance said paper feeding element a different amount, printing control means including a manually settable member selectively settable in a first condition for blocking said actuating means from operation and for preventing said pawl from engaging said ratchet, said control means being settable in a second condition for unblocking said actuating means and for enabling said pawl to engage said ratchet, and means controlled by said totalling controlmeans for setting said printing control means in said second condition, and a latch controlled by said totalling control means for latching said printing control means in said second condition.

References Cited in the le of this patent UNITED STATES PATIENTS