US1833830A - Matrix bar for type-line setting and casting machines - Google Patents

Description

J. DORNETH Nov. 24, 1931.

MATRIX BAR FOR TYPE LINE SETTING AND CASTING MACHINES Filed March 9, 1931 fiweziaior: $04M $1 M Patented Nov. 24, 1931 UNITED STATES PATENT OFFI'CHEIV-II JULIUS DORNETH, OF 'KONRALDSHOHE, NEAR TEGEL-BERLIN, TYPOGRAPH G. M. B. IL, OF BERLIN, GERMANY Y, ASSIGNOR 'ro MATRIX BAR FOR TYPE-LINE SETTING AND, CASTING MACHINES Application filed March 9, 1931, Serial No.

This invention relates to a two-part matrix bar for type-line setting and casting machines with matrices suspended and guided on wires, the parts of which bearing the characters and the suspending eye are slidably arranged relatively to one another. A matrix bar the parts of which can be pushed together and which is adapted for practical purposes must fully comply with the hereinafter briefly enumerated conditions: The cross-section of the matrix bar must not be thicker or only very slightly thicker at the point where the means for moving the bar is provided than the crosssection of the steel part used in the hitherto adopted bar matrices, that is to say the cross section must in any event be less than the cross-section of the lower part bearing the characters so that .when justifying the line the matrix bars cannot move apart radially upwards whichmay result in a jamming of the suspending eyes on the guide wires and a bending of the matrixbarsa I v V, A matrix bar, the parts ofwhich are'adapt- 2 'ed to be pushed together, must be very stable so that a bending of the matrices cannot take place when setting and distributing the same and consequently a movement of the matrix bar on to the bar at the setting point is prevented. However, such a stability only exists when the parts of the matrix bar, which are moved relatively to one another, are always guided during their movement with large surfaces longitudinally and transversely on many sides.

Notwithstanding the requisite stability, the guiding must, however, not be effected. through the medium of surfaceswhichhave a too accurate fit and bear directly against 4 one another but there must exist a certain minimum play, in the plane of the matrix bar and also vertically thereto for otherwise the friction'may be so great that it would prevent the raising and lowering of the matrix bars. .Such an accurate fit would also lead to a clamping or jamming owing to the unavoidable bending of the bar during the operation so that a movement of the -parts of the matrix would be impossible. However, it is essential that the parts of 521,287, and in Germany October 9, 1930.

the matrix should be easily movable at any time. I However, in spite of the most accurate manufacture, a matrix'bar whose partsare adapted to be pushed together must not be more expensive than the ordinary-matrix bar, It must also be so designed that a movement of its parts cannot be effected or prevented by any accumulation or depositof dirt; however, it must be possible to effect a quicklamlthorough cleaning of the parts which are hin- Cqered in their free movement by avdeposit of irt. Attempts have frequently been made in thecourse of time to find a practical solution for a matrix bar capable of being lengthened and shortened respectively, It is, however, a fact that none of these matrix bars has hitherto proved satisfactory in practice because none of them has fully complied with the re quirements of 'a matrix bar, the parts of which are adapted to be pushed together." None of the hitherto proposed solutions has fulfilled the above enumerated conditions;

An attempt has hitherto been made to guide both movable parts together by an arrange,-

ment of slots and pins or use has been made of a sleeve closed on all sides for guiding the part of the bar movable therein. It has also been proposed to mill a groove in the lower part of the bar from above and from its one narrow side which encloses the upper movable part on two broad sides and one narrow side; the guiding of the movable part will thus be eflected not only'by the two broad sides of the groove but also by pin and slot inconnection with the closed part of the groove. 7

However, it has been'noticed during operation that a jamming of the parts of the matrix takes place in all cases where slot and pin are conically formed per se or are? made straight and are provided in connection with a sleeve for guiding the relatively movable parts. Moreover, owingto the great wear and tear of the small contact pointso'f 1 these pin and slot guides during operation, the play of the movable parts is increased to an inadmissible extent so that the parts move relatively to one'another in the direction oftheir plane as well as vertically thereto whereby the jamming is again caused. With regard to the arrangement of a guiding sleeve closed on all sides, it has been found that with this type, especially in the case of small characters and the long thin matrix bars, the

cross section at the connecting place of the movable parts is too thick and consequently gives rise to the above-mentioned drawbacks. Regardless of the complicated manufacture, such a sleeve which is closed on :allsides does not ensure an accurate guiding of the parts and the dirt which is deposited at these-con .necting places cannot be readily removed therefrom. The same drawbacks would be not ceable when usinga guiding sleeve which surrounds the movable part of the bar on two The atbroadsidesand one narrow side. tempt to obviate these drawbacks by replacing the special sleeve to be attached to a part of the bar by milling a .groovein the latter from above and from the narrow side has al slo not led to a permanent satisfactory resu t.

method of manufacture which is not suitable for mass production'and the unfavorablecleaning possibility, the cross-section of trixbar pushed together. 7 V I Fig. 3 is a view of the closed broad side the matrix bar at the connecting place isv too weak to comply with the working re quirements.

[Thepresent invention has for its object I of the same .part of the matrix bar when pushed together.

. Fig. l'is a cross-section onthe line Ive-TV through the part ofthe matrix bar shownin Figures 1-3. V

The three-sided guiding sleeve 2 is secured,

for instance, 'by rivets to the, upper end of the steel bar .1 bearing the characters in its extension. The two narrow sides of the sleeve 2 areibent so as toserve as a guide for the dovetailed sides of the lower end of the upper-steel bar 3 bearing the suspending eye ,andadapted to 'move longitudinally in the sleeve; There is secured approximately in the .middleof the guiding sleeve 2 and on its broad side a pin 5t witha straight surface, that is to say a pinof cylindrical for prisaimaticshape. This pin & extendsin the slot 5 Regardless of the more expensive,

most positions of the movable part 3 are limited by the said pin and slot arrangement. There is suflicient play between the pin l and the sides of the slot 5 to prevent contact during the slidingmovem'ent. The length of the guiding sleeve 2 and that of the slot 5 and of the part 3 respectively coincide with each otherso that when the matrix bar is pushed together the gap 6 is left between the two steelparts 1 and 3.. The length of the sleeve 2 is such that even when the bar is drawn apart, there is sufficient guiding for the part 3. The bar 3 is provided with dovetailed narrow sides 7 only over a part of its entire length but the length of the said sides is such thata sufficiently reliable guiding is ensuredin any position of the parts 1 and 3 relatively to one another. A construction of the sides 7 beyond the required extent is prevented by the part 3 above the guides 7 being made narrower at 8 .and without lateral guiding members; however, in any case, the length of the guiding members 7 must be greater than that of the slot 5. i

WVithregardto the matrix bar according to the invention importance is attached to the fact that the guiding of the movable partsis not effected by slot and pin since it has been i found that such guiding does not afford any guarantee for, permanent use. The guiding provided in the upper steel bar 3. The outer- V of .thetwo parts is merely effected by means of the sleeve 2 secured to one part 1 of the bar and surrounding the other part 3 of the bar on three sides, the said part 3 adapted to move in the sleeve. For the purpose of reducing frictionand ensuring the cleaning possibility, the movable bar bears only with-one narrow slde against the sleeve wh1le owing to the dovetailed members 7 it is also guided in the sleeve on both narrow'sides. In this manner, an accurate and uniform guiding over the-entire path is attained and the parts are also easily movable by maintaining the smallest permissible play. The danger of wear and tear which arises with the pin and slot guiding arrangement is .also prevented. by the size of the contact surfaces. While acsleeve2, the slot and pin are merely used for limiting the highest and lowest position of the movable part. For this reason and in order not to unnecessarily increase the friction and to prevent jamming, the pine does not bear against the walls of the slot 5and since it has not to holdthe movable parts 1 [and 3 together, the pin 4 is designed with a straight surface for instance, cylindrical or prismatic. In order to reduce as much as possible the detrimental effects of the dirt deposits, the new matrix bar is designed in such a manner that when the matrix bar is pushed together, a gap 6 remains between both relatively'movable parts 1, 3, and durcording to the new matrix bar, the guiding of r the movable part 3 depends only on the ing the constant reciprocatory movement of one part of the bar, the dirt deposit may be collected in the said gap and easily removed therefrom at any time.

It is also important that the pin 4 is provided approximately inthe middle of the guiding sleeve 2 so as to ensure in the lowest position of the matrix an adequate and good guiding of the movable part 3 of the bar above the pin 4 and the stability of the matrix bar is also ensured in this position. Notwithstanding the necessary great length of the dovetailed guide according to the new matrix bar, the smallest possible friction is obtained since the movable part 3 is provided with only the shortest possible dovetailed guide 7 requisite for'maintaining the stability. The length of this dovetailed guide 7 also depends on the size of the slot 5 and slightly exceeds the length of the slot so that the reduction of the cross-section of the movable part 3 which is effected by the slot 5 has no detrimental results. The upper portion of the movable part 3 of the bar is thiner than the breadth of the dovetailed side guides 7 as is shown at 8.

Owing to this construction, the new matrix bar completely fulfills all the above-mentioned conditions. Its cross-section is hardlygreater than the cross-section of the steel bar even where the means for sliding the bar is provided and in any case the said crosssection is less than that of the lower part l' earing the characters. Owing to the sleeve 2, which is provided with a dovetailed guide, being arranged in the abovedescribed manner, the stability of the matrix bar is ensured without the free movement of the parts being prevented by the frictional conditions and without there being any danger of wear and tear. The two relatively movable parts 1, 3 are guided with only slight play in a constantly uniform and satisfactory manner when the matrix bar is pushed together or in the extended position and there is no danger of any amming resulting therefrom. The extent of any friction is reduced to a minimum notwithstanding the very long guiding sleeve 2. The possibility of a deposit of dirt is diminished by the arrangement of the open broad side but the cleaning possibility is increased especially by providing the gap 6 so that jamming and working interruptions are avoided. The arrangement of the dovetailed guide effectively obviates the detrimental effects of the crosssectional reduction of the bars owing to the slots formed therein.

Having thus fully describedthe invention what is claimedas new and desired to be secured by Letters Patent is:

1. A two-part matrix bar for type line setting and casting machines of the type having one part suspended from and guided on a ment includes a pin slidably connected to the inner part comprising a three-sided and open-faced sleeve-like element secured to one'part and arranged I in contacting and sliding engagement with one broad side and the two opposite and narrow side edges with only very slight play so as to form a guide for the movable part and a pin and slot arrangement between the guide sleeve and the movable part and serving merely for limiting the movement of the matrix bar into its highest and lowest positions.

2. A two-part matrix bar according to claim 1, wherein the cross-section of the bar and sleeve at the point of these connecting parts is only slightly thicker than the crosssec-tion of the upper movable part of the matrix bar and less than the cross-section ofthe character bearing lower part.

3. A two-part matrix bar according to claim 1 wherein the sleeve is open on one broad side while the two narrow sides are dovetailed.

4. A two-part matrix bar accordingto 5. A two-part matrix bar according tof claim 1, wherein the pin and slot arrangein the middle of the guiding sleeve so that even in the lowest position of the matrix, that is to say when the matrix bar is extended, an

adequate guiding which is absolutely reliable on all sides is ensured for the part of the bar adapted to move in the sleeve.

6. A two-part matrix bar according to claim 1, wherein the ment includes a slot of such length that a gap remains between both relatively movable pin and slot arrangeprovided approximately parts of the bar even when the matrix bar 7 is pushed together, the said gap being adapted to receive any deposits of dirt which might otherwise hinder the free movement of the parts of the bar.

7. A two-part matrix bar according to claim 1, wherein the part of the bar which is movable in the sleeve is provided with a dovetailed guide only over a part of its total length and extending slightly beyond the outer end of the slot while the remaining portion of thebar is reduced so that any unnecessary increase of friction is prevented even in the highest position of the matrix that is to say when the matrix bar is pushed together.

In testimony whereof I aflix my signature.

- JULIUS DORNETH.

wire, and the other character bearing part if

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