US2116286A - Calculating attachment for print - Google Patents

Description

May 3, 1938. c. H. SAMPSON CALCULATING ATTACHMENT FOR PRINTING MACHINES Filed May 18, 1953 6 Sheets-Sheet 1 E INVENTOR (HARLL-sfllMPw/v May 3, 1938. c SAMPSON 2,116,286

CALCULATING ATTACHMENT FOR PRINTING MACHINES Filed May 18, 1933 6 Sheets sheet 2 INVIENTOR .[IMFLEfl-S/INPJON C. H. SAMPSON CALCULATING ATTACHMENT FOR PRINTiNG MACHINES Filed May 18, 1953 6 Sheets-Sheet 3 Q a q m QQ 3 1) J I' I U) l q i INVENTOR C/i/imssfljlmvow AT'roR Y May 3, 1938. c. H. SAMPSON V CALCULATING ATTACHMENT FOR PRINTING MACHINES Filed May 18, 193-3 6 Sheets-Sheet 4 INVENTOR 0mm. 55/). 5A MPSO/V c @64 M z ATTORNEY May 3, 1 38- c. H. SAMPSON 2,116,286

CALCULATING ATTACHMENT FOR PRINTING MACHINES Filed May 18, 1933 6 Sheets-Sheet 5 May 3, 1938. c. H. SAMPSON v CALCULATING ATTACHMENT FOR PRINTING MACHINES Filed May 18, 19:53

6 Sheets-Sheet 6 ATTORNE Patented May 3, 1938 UNITED srAr CALCULATING ATTACHMENT; A Fon. PRINT- 1 Inc MACHINES Charles H. Sampson; Rochester, N. Y. Application May 18,v 1933,1Serial 10, 671,714 9'Claims. (Cl. 235-60) This invention relates to calculating machines and especially to machines which are adapted to be attached to typewriters or othenkeyb oard op erated printing and recording apparatus having a supporting member for the calculating attachment at the back of the keyboard to make the calculating machine jointly operable .with the apparatus towhich it is attached and the .objfect of the invention is to provide a novel mechanism for the calculating machine in order to make its construction and operation suitable for the practical and efficient operation of the calculating machine in conjunction with the apparatus to which it is' attached.

Another object of this invention is to provide a connection between the calculating .machine and the tabulating mechanism of the typewritingor other keyboard operated-printing apparatus to which it is attached. I

A further object ,of this invention is to provide the calculating machine with connecting means which provide a connection between it and .the operating keys of the keyboard ofthe typewriting or other keyboard operated printingapparatus other than the numeral keys such'as letter keys and the tabulating keys thereof.

Another object of this inventionis to =provicl the calculating machine-with a novel clearing mechanism. v y

Another object of this invention is tqprovide the calculating machine with a mechanism which requires an extremely -short.movement for the operating lever and mechanism 'of the registering mechanism. I i

All these and other objects andadvantages of this invention will become more readily apparent from the detailed description thereof which follows, reference being. had to the accompanying drawings in which w Figure 1 is a front elevation of the'gcalculating machine with the keyboard thereof partlybroken away. 1

Figure 2 is a rear elevation of the calculating machine with the keyboard partly broken away.

Figure 3 is a'front elevation of the keyboardand frame of a typewriter with the keyboard of the calculating machine attached thereto.

Figure 4 is a vertical sectional view of the keyboard and frame of the typewriter illustrated'in Figure 3 and the keyboard of the calculating machine attached thereto.

Figure 5 is a vertical sectional view of the calculating machine, the section being taken onthe line 5:13-53: of Figure 1 and looking in the direction of the arrow..

a Figure 6is an end elevation of the calculating machine. a

- Figure F7 is asimilar elevation with the clearing key operated prior to clearing the registering mechanism of the machine.

Figure8 is a detail rear elevation of part of the mechanism for operating the rack bars of the registering mechanism, the members thereof being shown infthe first stage of their movement in theop'erati n of .the rack bars. i Figure 9 gis a similar view of this mechanism atfthejencl of its movement and just before the mechanismreturns to its normal starting position. f' Fi'gure 10 is a detail rear elevation of the mechanis'moperated by the Add and Repeat" keys by means of,which the calculating mechanism is se't lfor' adding or. multiplying.

Figure 11 3s a detail longitudinal sectional view of; .a;portion" of the. pin carriage, illustrating the i e of springs used for retarding the movement of -the pins on. the operation thereof. EigUie-misa similar view illustrating a modifiedlforin' fdf the springs.

FigurelB is -a detail perspective view of the mechanism which prevents the clearing mechanisrn from operating until the rack bars are placed in theirnormal position for the return of the counter wheels tothe zero position.

- 511112116 severalfigures of the drawings like reference: numerals indicate like parts.

applicationis a continuation in part of my prior. application Serial No. 603,365 filed April 5 1932, and the vsubject matter of the invention disclosedgherein serves to make the calculating machine more efficient in its use with a typewriting or otherakeyboard operated recording apparatusr a As illustratedin the several figures of the drawings the calculating mechanism is attached to the frame 'l of a typewriter or other keyboard 40 operatedrecording apparatus by means of a lateralextension 2 of the casing 3 of the calculating -machine.- In this lateral extension are providedwamslides which transmit the motion of eitherthefinumeral keys- 4, v4 of the calculating machine or. that of the corresponding numeral keys 5,35 of the typewriter to the calculating mechanism asuillustra'ted and described in my prior application above referred to. The same 'camzslides, are connected to the key levers 6, 6 of numeral keysi, 5gof the typewriter by means of the links 3]; 1 which, asillustrated in my prior application, are pivotally-mounted to the vertical. cam slides. and are connected to the shift bar} with which these links are swung laterally to bring the shoulders 9, 9 of the links into and out of line with the lugs 9A carried by the key levers 6.

In the bank of keys 4 of the calculating machine numeral key 1 is located at the right hand end thereof. The connection between the cam slide of the numeral key 1 and the typewriter key for the small alphabetical character L which prints 1 and is used in place of a numeral key 1, is partly provided by the arm l0, which is pivotally mounted to the end of the shift bar 8 and is supported on 1. This link in turn is connected to. the cam slide operated by the numeral key "1 of. thebank of keys 4 of the calculating machine. The remainder of the connection between: the key lever. Ii of the small alphabetical character L and the arm I6 is provided by an arm |2 which is pivotally mounted to one side of thejkeyiever' H at |3. A spring I4 is stretched between this arm and a suitable lug MA in order to yieldingly hold the arm against the face of the casing 2' and have its hook shaped end engageover the top of the arm ill as illustrated in Figure 3; 0n the depression of the key lever II by its key, arm I6 is thus rocked by the arm l2 and the proper cam slide operated thereby.

As in the apparatus illustrated and described in my prior application above referred to, the operation of reach numeral key of the bank of keys ofthe calculating machine or operation of the numeral keys of the typewriter when the same are connected to' the calculating'machine; as above pointed out, depresses a predetermined pin i6 in the carriage l1 and advances the carriage after a pin has been depressed therein. A suitable escapement lever |8' is provided to permit the carriage to advance step by step;

The movement of the carriage l1 shifts the angular lever 19 on the. shaft 20. An arm 2| is keyed to the shaft and is connected to the lever I9 by means of the spring 22 so as to provide a yielding connection between the lever l9 and the shaft 2|]. The shaft is thus intermittently shifted as the carriage advances and this movement of the shaft intermittently rotates the disc 23 which is carried by the shaft at the rear end thereof as illustrated in Figures 2, 8 and 9; The disc 23 has a ratchet tooth 23A which advances step by step from its starting position as the carriage I1 is moved on the operation of the keys in settin up a number to be added or repeated. when the carriage is ready to be returned to its starting position for the next number to be added or repeated, the hand lever 24 is operated in front of the machine so as to rock the shaft 25 to which it is keyed. This shaft carries at the rear the lever 26 which is pivotally connected to the vertical slide 21 by means of the link 28.

The vertical slide 21 has pivoted thereon the spring pressed pawl 29 which normally engages over the ratchet tooth 30 provided at the back of the arm 3|. This arm is pivotally mounted at 32 to a lug 33 which overhangs the vertical slide to cause the arm to swing in front of the slide on the movement thereof. Pivotally supported at the back of the arm 3| by means of the pin 34 is the pawl 35, the free end of which is normally drawn against the'perimeter of the disc 23 by means of the spring 36 which is attached thereto at 31 and anchored to the fixed arm 38. As the vertical slide 21 is moved down by the operation of the operating hand lever 24, pawl 29swings the arm 3| by reason of its engagement with the ratchet tooth 30. The arm 3| swings downwardly until the shoulder 9 of the link 1 it reaches the position illustrated in Figure 8 in which the cam lug 39, carried by the arm 3|, engages the side of the upper end of the pawl and forces the pawl out of engagement with the tooth 30 while the toothed outer end of the arm 3| engages under the shoulder 40 of the swinging spring pressed arm 4|. The arm 3| is thus held from swinging back while the pawl 29 is disengaged from it and continues to move down with the vertical slide to the end of the downward movement of the vertical slide illustrated in Figure 9.

The pawl is thus moved down a predetermined distance and is held suspended from the arm 3| ready to engage the tooth 23A on the disc 23 and rotate the disc in a counterclockwise direction on its upward return movement. The most the tooth 23A is moved by the disc 23 on the movement of the carriage i1 is thru an arc of 45 degrees so that the tooth will at no time be out of reach of the pawl 35.

The vertical slide 21 carries at the back a horizontal shaft 43 as illustrated in Figure 5. This shaft is suspended by means of a pair of springs 44, one of which is shown in Figure 5. As the carriage is moved down, it is moved against the resistance of these springs and the spring 45 stretched between the arm 26 and the lug 46 provided on the frame of the'machine. The latter spring is provided so as to supplement the springs 44' and operate to raise the vertical slide especially during the last part of its movement to its starting position after the tension of the springs 44 has practically spent itself. In this way the springs 44 can be made a minimum length for the return movement of the vertical slide.

0n the upward return movement of the vertical slide 21 from the position illustrated in Figure 9, the pawl 35 remains stationary until the slide has again reached the position illustrated in Figure 2. But before this position is reached the pin 41, carried by the slide, engages the inclined side of the lower end of the spring pressed arm 4| and forces this arm to the left to disengage its shoulder from the toothed end of the arm 3| to release this arm and permit it to swing upwardly to its starting position due to the tension of the spring 36. During this latter movement of the arm 3|, the pawl 35 is raised by it and engages under the tooth 23A and rotates the disc 23 back to its starting position. This in turn rotates the shaft 20 and swings the arm l9, thru. the arm 20, to the right in Figure 1 and moves the carriage |1 back to its starting position. In order to cushion the upward movement of the arm 3| and the pawl 35 carried thereby, a leaf spring 48 is attached to the casing of the machine in line with the upper end of the pawl 35. The upper end of the pawl 35 is thus forced against this spring on its return movement and cushions it with a resultant silencing effect on these members of the machine.

The movement of the vertical slide 21 with that of the arm 3| and its pawl 35, as above described, takes place when the calculating machine is operated as an adding machine and the carriage |1 must be returned to its starting position after the original amount and after any subsequent amount to be added thereto has been set up on the keyboard.

When the calculating'machine is used for multiplying, the amount set up by the keys is repeated and. the carriage i1 is therefore not returned each time the vertical slide is moved by the operating handle. For this purpose the pawl 29 must be held out of engagement with the tooth 30 in order that the movement ofthe vertical slide will not swing the arm 3|. This is done by the bell crank 50 (see Figures 2 and 10) which is pivoted to the casing of the machine and engages behind the upper end of the pawl 29 with the pin carried thereby. The bell crank is rocked by means of keys 52 and 53 mounted at the ends of the rocking lever 54 (see Figure 1). This lever is mounted on the rock shaft 55 which carries at the rear end the cam lever 56. The pointed lower end of this lever is engaged by the spring pressed latch 51 in order to temporarily lock the end of the cam to either one side or the other of the angular tooth 58 carried by the latch 51. In this way the cam 56 may be moved and held in two angular positions by the keys 52 and 53. On the depression of the key 52 which ismarked Add, the cam lever is moved into and held in the position illustrated in full lines in Figure 2, in which position the bell crank 50 does not interfere with the position of the pawl 29 and therefore permits it to operate for adding purposes in the manner heretofore pointed out.

When key 53 which is marked Repeat is de pressed, the rock shaft 55 is rocked to move the lever arm from. the full line position to the dotted line position in Figure 2 or into the full line position illustrated in Figure 10. During this movement of the cam lever 56, the link 59, which connects the cam lever with the bell crank 50, swings the bell crank and with it the pawl 29 to the left in Figure and thus keeps the pawl out of engagement with the ratchet tooth 30 of the arm 3|. The downward movement of the vertical slide then leaves the arm 3| undisturbed which keeps the pawl 35 from engaging the tooth 23A in the disc 23 and returning the carriage to its starting position. As long as the repeat key remains in its operated position the amount set up by the keyboard is thus repeated and automatically added to the: previous total each time the operating lever 24 is operated.

The amount set up on the keyboard is transferred to the number wheels 60 by means of the rack bars 6|. These rack bars are carried each by a supporting-slide 62 (see Figure 5). Nine supporting slides 62 are thus provided and each of them carries a rack bar 6| for engagement with one of the nine number wheels 60. The supporting slides in turn are supported on the horizontal shaft 43 of the vertical slide 21 and are yieldingly held in engagement therewith by means of the springs 63 which are stretched between the upper end of each of the supporting slides and the stationary anchoring ledge 64. As the vertical slide 2'! is moved down, each supporting slide 62 moves with it until the rack bar 6|, carried by it, encounters one of the pins N5 of the carriage which has been moved to project into the path of the particular rack by one of the keys. The movement of each supporting slide is thus arrested by the engagement of its rack bar with a pin l6 which has been operated by a key. While the rack bars 6| are moved downwardly by their supporting slides 62, they are held out of mesh with the teeth in their corresponding number wheels 69 by swinging the number wheels away from the rack bars. For this reason the number wheels are mounted on the counter shaft 65 which is journaled in the arms 66 and 61 which in turn. are mounted to swing on the pivot shaft 68.

Moving the counter wheels 60 into and out of mesh with the rack bars is done by the latch plate 69 which is carried by the outer end of the counter shaft 65. This latch plate cooperates with the rocking lever 10 and in turn with the cam latch H and its backing members 12 and 13 to swing the counter shaft 65 toward and away from the rack bars.

As illustrated in Figures 6 and '7 the latch plate is provided with the slots 14 and 14A which are arranged opposite to each other to have the pins 16 and 11 of the rocking lever 10 engage thereinto. Before the hand lever 24 is operated to totalize an amount, the latch plate 69 is in the position illustrated in Figure 6 in which position the pin 16 of the rocking lever 10 is located in the slot 14 of the latch plate. The cam latch H is carried by the vertical slide 21 and moves therewith and overhangs the pin 16 in this position so that on the downward movement of the vertical slide by the hand lever, the lower angular cam surface I5 of the cam latch forces the pin 16 and with it the cam latch 69 to the right. The counter shaft 65 is thus swung to the right by the cam latch 69 and moves the counter wheels out of mesh with the rack bars. During the downward movement of the vertical slide with the rack bars, the counter wheels are thus kept from being rotated by the rack bars.

The cam latch H is pivoted at 18, but due to the backing member 12, which makes. contact with the back of the latch, it cannot swing back but will remain fixed until the latch has forced the latch plate to the right as above pointed out and has moved below the backing member.

The cam latch 1|, in forcing the pin 16 to the right, rocks the rocking lever and causes the pin 1'! at the lower end thereof to swing to the left. As the latch keeps on moving downward it therefore comes in contact with the pin but, due to the fact that the cam latch is no longer backed up by the backing member 12, the latch will be swung to the left by the pin T! as it moves past it and leaves the latch plate undisturbed in the position into which it was moved at the beginning of the downward movement.

The backing member 13 is free to yield to the cam latch and swings away from it on its downward movement until the cam latch is past it and is ready to move up again to return to its starting position. As soon as the cam latch has passed the backing plate 13, the backing plate is drawn back against the stop pin 19 by the spring 80 ready to back up the cam latch 7| at 8! on the first part of its upward movement. While the cam latch 1| is thus backed up by the backing member 13, the inclined cam surface 82 of the cam latch forces the pin 11 to the right as it moves past it on its return movement. This in turn rocks the rocking lever 19 so that the upper pin 16 thereof is swung to the left and draws the latch plate 69 with it to swing the counter wheels into mesh with the rack bars. In this way the counter wheels are operated on the upward movement of the rack bars and are rotated according to the length of travel of the rack bars from the position in which they were stopped in their downward movement by the pins l6 operated in the carriage I! by the keys of the calculating machine or the typewriter.

When it is desired to clear the machine; that is reset all of the counter wheels to their zero position, the Clear key 83 is operated. This key is mounted on the end of the cam slide 84 and moves endwise at the end of the casing as illustrated in Figures 1, 6 and 7. On the cam slide is provided the inclined cam surface 85 and the cam lug 86. The inclined cam surface operates to raise the pin 81 carried by the resetting cam 88 (see Figure 1) so that when the Clear key is operated, the inclined cam surface of the resetting cam engages the end of the horizontal carriage extension 89 and moves this extension and with it the carriage H to the right to bring the vertical notches 90 provided in the extension in line with the rack bars BI to permit them to move downwardly for clearing the amount indicated on the counter wheels.

While the extension 89 is moved to the right to permit the simultaneous downward movement of all of the rack bars without being arrested by any of the pins IS in the carriage I1, the latch plate 69 is operated by the cam lug 86 and is. moved to the left and raised into the position illustrated in Figure 7. This takes place when the cam lug 86 engages the pin Si in back of the latch plate and moves it to the left ahead of it. In moving to the left, the latch plate is also rocked upwardly until the pin 9| is located on top of the cam lug 86 and has raised the latch plate so that the pin 76 of the rocking lever I0 is disengaged from the slot 14 of the latch plate while at the same time the pin 11 is moved into the slot 15 of the latch plate. The movement of the latch plate by the Clear key thus draws the counter wheels into mesh with the rack bars so that on the downward movement of the rack bars on the operation of the handle 24 all of the counter wheels are rotated until their zero position has been reached in which they are arrested by the engagement of their lugs 60A with the latch 60B as illustrated in Figure 5. Due to the disengagement of the pin I6 from the slot 14 of the latch plate 69, the cam latch cannot act on the latch plate duringthe downward movement of the cam latch, but on the return upward movement of the cam latch II, its cam surface 82 engages the pin 11 and forces it to the right with the latch plate to again move the counter wheels out of mesh with the rack bars and leave them in their zero position. When the counter wheels are moved out of mesh with the rack bars they are swung against the fixed rack I20 (see Figure 5) tohave the teeth thereof engage between two of the teeth of the counter wheels to prevent their rotation while disengaged from the rack bars. The transfer mechanism for use in this machine is shown in my co-pending application Serial No. 603,365, filed April 5, 1932.

0n the operation of the Clear key, as above described, the bottom of the cam slide 85 is held down onto and slides over the top of the fixed lug 92 and when the cam slide has reached its operated position, the shoulder 93 thereof drops behind the lug 92 and is held anchored thereon. Todisengage the cam slide from the lug 92 after the amounts have been cleared from the counter wheels, the spring pressed latch 94 is carried by the vertical slide 21 below the cam'latch 1 I. This latch slides over the horizontal tooth 95 provided at the inner end of the cam slide 84 on the downward movement thereof, but engages under this tooth on the return upward movement and raises the inner end of the cam slide torelease the shoulder 93 from lug 92 and allow the spring 96 to draw the cam slide with its Clear key forward to its normal inoperative position.

Before clearing the machine it is necessary to have all of the rack bars in their normal position illustrated in Figure 5 in order that the clearing operation will move the rack bars to cause all counter wheels to be returned to their zero position and to prevent the operation of the Clear" key while one or more of the rack bars have been raised above the normal starting position in carrying overan amount from the preceding counter wheel, a horizontal locking bar 91 rests on top of the rack bars and is supported by a pair of arms 98 and 99 which are mounted on pivot pins which are journaled in suitable bearings. One of these pivot pins has an extension which carries at the outer end the locking dog I00. This locking dog is adapted to swing into and out of a notch IOI in the upper end of a vertical extension I02 of the clearing cam 88. When one or more of the rack bars are raised, the locking bar 97 is raised with it and swings the locking dog I00 into the notch of the clearing cam extension and thus prevents the clearing cam from being operated by the Clear key as above pointed out. By operating the handle 24 with the carriage in an' inoperative or neutral position, any raised rack bars are lowered to their normal starting position and in lowering the locking bar swings down and moves the locking dog I00 out of the notch in the clearing cam extension and permits the Clear key to operate the clearing mechanism.

As illustrated and described in my prior application, above referred to, the shift bar 8 is moved to swing links I with their shoulders 9 out from under the lugs 9A of the key levers after each operation of the operating lever 24 of the calculating mechanism and the shift bar is moved to swing the links under the lugs of the key levers to be operated thereby by means of a suitable lever at one end of the shift bar. For this lever the handle I03, carried by the shift bar as illustrated in Figure 1, is substituted in my present construction.

Most all typewriters and other key board operated recording machines are provided with one or more tabulating keys which release the carriage of the machine and allow it to move to predetermined positions for the uniform tabulation of figures. When the tabulating keys are used the use of the calculating machine attached to the typewriter is desired as well. In order to link the tabulating mechanism of the typewriter with the calculating mechanism so that on the operation of one of the tabulating keys the calculating mechanism is automatically connected to the numeral keys of the typewriter, I have provided the calculating machine with a series of tabulating keys H0. These keys are mounted on top of the cam slides III which are mounted to slide at the back of the extension 2 of the calculating ma chine casing as illustrated in Figure 2. The cam slides and their tabulating keys are arranged in the position of the tabulating keys of the typewriter to which the calculating machine is attached so as to be in line with the tabulating key levers I I2 from which the original tabulating keys have been removed as illustrated in Figure 4. Each of the cam slides III carries a lug II3 which overhangs the end of the tabulating key lever of the typewriter so that on the depression of the tabulating key, its corresponding key lever is operated thereby to release the carriage of the typewriter and allow it to move to the desired position.

At the lower end of each of the cam slides I II is provided an inclined cam I I4. These cams are adapted to engage the pins H5 which project thru suitable slots in the casing from the shift bar 8 so that on the operation of one of the tabulating keys the shift bar is moved to swing the connecting links I with their shoulders 9 in line with the key levers of the numeral keys of the typewriter. Moving the carriage of the typewriter for tabulating purposes thus automatically connects the numeral keys of the typewriter with the calculating machine.

The Ribbon key H6 and the Back space key I I1 is mounted on a slide H6 which is provided with a lug H3 but no cam. The opera tion of these two keys does therefore not affect the calculating mechanism but simply operates the particular key levers with which the lugs I I3, carried by the slides of these keys, make contact.

As illustrated in Figure 11, the pins IS in the carriage I! are retarded in their movement by means of a series of springs I25 which are shaped so that each partially encircles two of the pins Hi. The springs are held in place to engage the pins by means of the studs [25A,

In Figure 12 I have illustrated a modified form of the springs which is indicated by reference numeral 126. These springs are also shaped to partially encircle two of the pins l6 but do not need an anchoring pin to hold them in place.

I claim:

1. In a calculating attachment for key board operated printing machines having a key controlled carriage carrying a series of settable stops, rack bars cooperating with said stops and counter wheels operated by said rack bars, the combination of a vertical spring suspended slide having said rack bars yieldingly supported thereon, a rocking shaft operated by said carriage on the movement thereof, a disc having a ratchet tooth carried by said rocking shaft, a swinging arm, a latch suspended from said Swinging arm and yieldingly held against said disc, a spring pressed pawl carried by said vertical slide and adapted to engage said swinging arm to swing said arm on the downward movement of said vertical slide, locking means for engaging and locking said swinging arm in a predetermined position and means carried by said vertical slide to release said locking means on the upward movement of said vertical slide to permit the return of said swinging arm and have said latch engage said ratchet tooth and rock said rock shaft to return said carriage to its starting position,

2. In a calculating machine having a movable carriage with a series of settable stops and a key operated mechainsm for controlling the movement of said carriage in one direction, the combination of a rock shaft connected to said carriage, a vertical slide, a spring pressed pawl carried by said slide, a latch moved by said pawl into a predetermined position during part of the downward movement of said vertical slide, said latch cooperating with said rock shaft to turn said rock shaft on the upward movement of said vertical slide and move said carriage back to its starting position.

3. In a calculating machine having a movable carriage with a series of settable stop pins and a key operated mechanism for controlling the movement of said carriage in one direction, the combination of a rock shaft connected to said carriage, a vertical slide, a spring suspension for said vertical slide, an operating lever for moving said vertical slide, a spring connected to said operating lever and cooperating with said spring suspension to return said vertical slide to its starting position on the return movement of said operating lever, and means operated by said slide for turning said rock shaft and returning said carriage to its starting position on the upward movement of said vertical slide.

. 4. In a calculating machine having a movable carriage with a series of settable stops and. a key operated mechanism for controlling the movement of said carriage in one direction, the combination of a rock shaft connected to said carriage, a vertical slide, an operating lever for moving said vertical slide, a pawl carried by said vertical slide, latch means operated by said pawl on the downward movement of said vertical slide, said latch means being held operatively connected to said rock shaft to cause the carriage to be returned to its starting position on the release of said latch means, lever means engaging said pawl and means for swinging said lever means to move said pawl out of engagement with said latch means to keep said latch means inactive during the entire movement of said vertical slide.

5. In a calculating machine having a pin carriage and selective means for resetting the pin carriage, the combination of a vertical slide, a latch carried by said slide, an arm mounted to swing in front of said slide on one side there of, a locking latch mounted to swing on the other side thereof, said latch carried by said slide being adapted to engage and move said arm into lock ng engagement with said locking latch.

6. In a calculating machine having a pin carriage and selective means for resetting the pin carriage, the combination of a vertical slide, a latch carried by said slide, an arm mounted to swing in front of said slide on one side thereof, a locking latch mounted to swing on the other side thereof, said latch carried by said slide being adapted to engage and move said arm into looking engagement with said locking latch, cam means carried by said arm and adapted to engage said latch carried by said slide and move said latch out of engagement with said arm on the engagement of said arm with said locking latch.

7. In a calculating machine having a pin carriage and selective means for resetting the pin carriage, the combination of a vertical slide, a latch carried by said slide, an arm mounted to swing in front of said slide on one side thereof, a locking latch mounted to swing on the other side thereof, said latch carried by said slide being adapted to engage and move said arm into locking engagement with said locking latch, a lever adapted to engage said latch carried by said slide at the starting position thereof, and means for operating said lever to keep said latch out of engagement with said arm.

8. In a calculating machine having counter wheels mounted to rotate on a counter shaft with the counter shaft being shiftable to move the counter wheels into and out of mesh with rack bars, the combination, of a latch plate mounted to swing on said counter shaft having a pair of spaced slots facing each other on one side thereof, a rocking lever, a pair of pins carried by said lever, said rocking lever and its pins being arranged to have one of said pins engage into one of the slots in said latch plate while the other pin is held out of engagement with the other of said slots, a movable cam latch adapted to operatively engage the pin engaged into the slot of said latch plate on its movement in one direction and rock said rocking lever and move said latch plate to swing said counter wheels out of mesh with said rack bars, said movable cam latch being adapted to engage the other pin on its return movement in the opposite direction and rock said rocking lever to move said latch plate to swing said counter wheels into mesh with said rack bars.

9. In a calculating machine having counter wheels mounted to rotate on a counter shaft with the counter shaft being shiftable to move the counter wheels into and out of mesh with rack bars, the combination of a latch plate mounted to swing on said counter shaft having a pair of spaced slots facing each other on one side thereof; a rocking lever, a pair of pins carried by said lever, said rocking lever and its pins being arranged to have one of said pins engage into one of the slots in said latch plate while the other pin is held out of engagement with the other of said slots, a movable cam latch adapted to operatively engage the pin engaged into the slot of said latch plate on its movement in one direction and rock said rocking lever and move said latch plate to swing said counter wheels out of mesh with said rack bars, said movable cam 5

Images