US1638799A - Cam stop strip for keyboard assemblies of machines for casting lines of type - Google Patents

Description

7 1,638,799 L CURLE YBOARD ASSEMBLIES OF MACHINES FOR CASTING LINES OF TYPE Filed July 6 1926 Aug. 9, 1927.

CAM STOP STRIP FOR KE EM) 6601 6L. Czi e l? %1MZ Patented Aug. 9, 19 27.

UNITED STATES PATENT OFFICE.

GEORGE LOUIS CURLE,'OF MINNEAPOLIS, MINNESOTA.

CAM STOP STRIP FOR KEYBOARD ASSEMBLIES OF MACHINES FOR CASTING LINES OF TYPE.

Application med July 6, 1926. Serial No. 120,576.

My present invention relates to the assembling mechanism of machines for casting lines of type,and has for its object to provide an improved cam stop strip forthe keyboard assembly.

Cam stop strips now used are'in the form of a comb in which the teeth, commonly referred to as pins, are integrally formed with the body thereof. It often happens that during the operation of a machine for casting lines of type, one of the pins ofthe camstop strip breaks, thus ne'cessitating'the stopping of the machine and the removal of the entire cam stop strip, which is of no further use and may be thrown away, and the,

substitution of a new striptherefor. There is not only-considerable expense in making this replacement, but a relatively large amount of a mechanics time is required in doing the work, 'which includes the resetting of the pins of the cam stop strip in their proper relation to the cams, and during this time, the machine and operator are idle.

My invention provides a cam-stop strip having independentlyremovable andreplaceable pins, which, in case one breaks, may be easily removed and a newone substituted therefor without removing said strip from the machine. In making such a replacement, it is only necessary to reset the respective pin, as the other cams and pins have not been disturbed and remain in the same relation as when the machine was stopped.

The said invention'further provides a cam stop strip having pins that are mounted for slight independent angular movement lon-' gitudinally of said strip to compensate for any difference in the spacing of the cams and the co-operating pins or in case they are slightly out of alignment;

In the accompanying drawings, which illustrate the invention, like'characters indicate like parts throughout the several views.

Referring to the drawings:

Fig. 1 is a fragmentary rear elevation of the keyboard assembly having the invention embodied therein, with some partssectioned on the line 11 of Fig. 2; Fig.- 2 is a view partly in side elevation and partly in section of Fig. 1; V

taken onthe line 2+2 5 i the bars 18, and vertically movable rods 20 in diflerent positions by means of broken 1 lines;

Fig. 4 is a fragmentary detail view showing one of the pins removed from the strip, with some parts sectioned; and

F ig.- 5 is a perspective view of the cam stop strip with the pins removed.

The improved cam stop strip comprises a bar7, which is substantially square in cross section, and a plurality of individual removable and replaceable pins 8 having relatively long cylindrical heads 9, that extend entirely from the faces of said pins and transversely thereof. The pin heads 9 are removably mounted in bore-like seats 10 that extend transversely through the bar 7 from f the front to the rear thereof, and the pins 8 eX- tend through contracted passageways-11, the latter extending from said seats through the bottomof said bar 7. The long pin heads 9 hold the pins 8 against angular movement transversely of the barf7. The passageways 11 extend-completely through the bar 7 from 'the front to the rear thereof and are arranged to receive the pins 8 as the heads 9 are inserted into the seats 10 from the front of said bar. Said passageways 11 are slightly wider than the pins 8 to permit a slight angular movement of said pins longitudinally of the bar 7 by a rocking movement of the pin heads 9 in their seats 10 for a purpos that willpresently appear. For the purpose of showing the invention embodied in the keyboard assembly of a machine for casting lines of type, there are fragmentarily illustrated in the drawings the following part s'of a Mergenthaler linotype casting machine, to wit: front and rear frame bars12 and 13, respectively, driven cam-rotating roll 14, horizontal camsupporting yokes 15 having their front ends removably pivoted at 16 to the front frame member 12, which permits vertical swinging movement of said yokes, rotatable cams 1 7 journaled in the yokes 10, key-actuated vertically movable bars 18, bell cranks 1.9 for supporting and operating the yokes 15 from for operating the mechanism for releasing the matrices.

The front lower corner of the rear frame member 13 is longitudinally rabbeted to form a seat 21 for the cam stop strip furnished with the machine, but for which strip my improved cam stop is substituted, as best shown in Fig. 2. The cam stop strip furnished with the machine is relatively thin and secured to the frame member 13 by aplurality of screws, which must be removed when the cam stop strip is detached from the machine in case one of its pins are broken. My improved cam stop strip is of such size as to completely fill the seat 21 and is secured to the frame member 13 by a pair of screws 22. .lVith the bar 7 thus mounted, the pins 8 and their heads 9 engage the rear frame member 13 as an abut mentfor holding said pins against rearward movement from said bar, but which pins are individually free all times for withdrawal from their seats 10 by a forward movement. Each cam 17 comprises two connected laterally spaced members having peripherally serrated portions and an abutment 25 between said members in case the pins 8 and cam 17 are not spaced quite the same or if they are not quite true. In applying the pins 8 to the bar 7 they are inserted between the members of the cams 17 and are of such length as to be engaged by the abutments 25.

Normally, the keyboard bars 18 are clepressed with their bell cranks 19 holding the yokes in intermediate positions in which the cams 17 are stopped by the engagement of their abutments 25 with the pins 8 of the cam stop strip. When the cams 17 are stopped by the pins 8, their serrated portions are directly over the roll 141 and out of engagement therewith.

When an operator wishes to release a certain matrix, he depresses the proper key, not shown, and thereby raises the respective key bar 18, which moves its'bell crank 19 into a position to lower the engaged yoke 15 and bring its serrated portion into contact with the rotating roll 1 1 to be rotated thereby in the direction of the arrow marked thereon in it may be here stated that each time a key is depressed the respective cam 17 is given one complete rotation, partly by the roll 1-1 and partly under the action of gravity. Said cam 17, during its initial rotary movement by the roll 14;, raises the yoke 15 which, in turn, lifts the rod 20 and th reby operates the proper mechanism for releasing the respective matrix. At the timethe cam 17 is lowered onto the roll 14 by the bell crank 19, its abutment is carried below the co-operatin g pin 8 of the cam stop strip so to release said cam and permitthe same to be rotated. The cam 17 is given substantially two-thirds of a rotation Fig. 2.

which operates the bell crank 19 to release the yoke 15 and allow the cam 17 to loosely rest on the roll 19 through substantially two-thirds of its rotation, and at the completion of this portion of the rotation of said cam, the yoke 15 reengages the bell crank 19 and is supported thereby to hold the cam 17 out of engagement with the roll 9. At the completion of the rotation of the cam 17, its abutment 25 engages the respective pin 8 on the cam stop strip and is again properly positioned with its serrated portions overlying the roll 1 1 and out of engagement therewith.

In case one of the pins ,8 is broken, it is only necessary to remove the same by means of a pair of pliers, and insert a new pin into the respective seat 10. When a broken pin 8 is removed from the bar 7, the respective cam 17 is released by the withdrawal of said pin from back of its abutment 25 and drops onto the roll 1%. Upon starting the machine after the broken pin has been replaced by a new one the released cam 17 resting on the roll 14 will be rotated by said roll until it is stopped by the engagement of its abutment with the new pin 8.

As the strain on the pins 8, by the engage ment of theabutments 25 therewith in step pin the rotation of the cam 17and holding the same from droppingonto the roller 14, is in a direction to hold said pins pressed into their seats and against the rear frame member 13 as an abutment there'is no need of securing said pins in their seats.

It will thus be seen that after the bar is once applied to a machine, it need never be removed and it isan extremely simple and easy matter to remove a broken pin and substitute a new one therefor Whatl claim is:

l. A cam stop strip of the kind described having pins yieldingly mounted for self-centering action. 7

2. The structure defined in claim 1 in which said pins are mounted on .the strip for lateral movement longitudinally thereof.

3, The structure defined in claim 1 in which said pins are mounted on the strip for slight angular movement longitudinally thereo p I 1. A cam stop strip of the kind described having a plurality of longitudinally spaced relatively deep transverse seats with contracted passageways extending through the bottom of said strip, and pins having rela- Tl tively long transverse heads removably mounted in said seats with said pins extendin through said contracted passageways.

5. The structure defined in claim 4 in which said passageways are of such width as to permit a slight angular movement of the pins longitudinally of the strip.

6. A cam stop strip of the kind described having a plurality of longitudinally spaced l0 relatively deep transverse bore-like seats said pins extending through said contracted 15 passageways with freedom for slight angular movement longitudinally of the strip.

In testimony whereof I aflix my signature.

GEORGE LOUIS CURLE.

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