US1614479A

US1614479A - Matrix holder

Info

Publication number: US1614479A
Application number: US52925A
Authority: US
Inventors: Leinweber Adolf
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-08-09
Filing date: 1925-08-27
Publication date: 1927-01-18
Anticipated expiration: 1944-01-18

Description

' remedy the defects of existin Patented Jan. 18,1927.

UNITED' STATES 1,614,479 PATENT OFFICE.

ADOLF LEINWEBER, OF MUNICH, GERMANY.

' MATRIX HOLDER.

Original application filed August 9, 1924, Serial No. 731,228, and in Germany April 13, 1923-. Divided and this application filed August 27, 1925. Serial No. 52,925.

My invention relates to a matrix-holder, especially for use in casting'boxes employed in the production of printing plates for rotary presses.

The present application is a division of Letters'Patent No. 1,575,995, issued to me March 9th, 1926.

According to present practice, the positioning and securing of the matrix in the casting box is a somewhat difiicult and timeconsuming operation. After each cast the matrix must be readjusted, or it is so tightly secured initially in the casting bed that the matrix cannot follow the change of shapev (contraction) of the cooled freshly cast printing plate, with the result that the printing plate is unsatisfactory and the matrix cannot be readily removed from the plate. Moreover. Where the matrix is ten sioned' on the side where the molten metal is poured into the box, it is not possible to obtain access to the castingbed, for cleaning purposes, after each casting operation.

The principal object of my invention is to structures, above briefly referred to, and 1n pursuance of this object I position and secure the matrix, outside of the casting box, whereby (a) the matrix ofiers no appreciable resist ance to the change in size (contraction) of the cast plate resulting from the cooling thereof; (b) the matrix may be readily removed from the mold even in the case of very deep impressions; (a) the matrix automatically returns to its proper position in the casting box after each casting operation, and (d) the matrix does not obstruct access to the casting bed, so that the latter maybe inspected and cleaned, if required, after each cast.

. Stated'briefiy, my invention comprisesa matrix-supporting frame which is movable about the pivotal axis of the casting-box core, the frame having at one side a hook or other means to enter a' suitable orifice 1n thematrix, and at the other side an adjustable matrix holder which. when the cast-' ing box is opened,i'e1noves the matrix from the cast plate and permits the matrix to return automatically to its proper position in the casting box.

The preferred-form .of my invention is illustrated in the accompanying drawing in which Fig. 1 is a fragmentary lon itudinal sectional view through the right si e of the casting box, this side being provided with the ingate for the molten metal; Fig. 2 is a similar view through the left end of the casting box; Fig. 3 is a schematic view-of the casting box with the core removed; Fig. 4 is a plan view of the matrix-supporting frame and matrix holder, and Fig. 5 is a detail view of a. fragment of the frame and matrix holder. T

Referring to the drawing, n denotes the casting box and o the core thereforv pivotal about the axis 71.

The matrix-supporting frame, to be fully described hereinafter, is movable about the pivotal axis 2' of the core. The frame comprises a rear member (I, lateral curved membersf and f and a matrix holder Z which is movable on studs 72?. carried by the frame.

As shown in Figures 2 and. 4, the frame member d, which is the rear cover plate for the casting box, is provided with a hook or pin a designed to pass through and engage distance from the type matter on the matrix.

Consequently when the orifice is passed over the pin 6 the matrix, at this sideof the frame, is always in the correct position.-

In order that the matrix may be properly positioned laterally, the curved frame members f and f which constitute the side closures of the casting box, are each provided with an inclined or bevelled flange g which flanges, in addition to laterally positioning the matrix, also give the desired shape to the sides of the cast printing plate.

So that the frame members 7 and f may be simultaneously moved into and out of the casting box, and so thatthey may receive the matrix holder on the-pouring side and may be completely moved out of the box withithe matrix holder, these frame members 7" and f are rigidly interconnected by a bar 71. and by the member (1 totform a frame which is movably supported by the pivotal axis 6 of the core, so that the frame is not only so movable about this axis but may also be completely removed therefrom. As a result ofthis arrangement the members f and f may be replaced by others to provide completed printing plate is moved out of the during its release from the printing plate on the side opposite that provided with the orifice, I provide the matrix holder Z and form a groove A: in the latter. The matrix holder is movable on the frame and is guided in its movement by" the studs m (Fig. 3).

I also provide meansfor actuating the ma trix holder Z and a description of these means .will be given in connection with a descriptiori of the operation of the entire'device.

The operation of my improved device is as follows: The matrix 2 is not at first placed into the casting box, as heretofore, but is first positioned on the frame. To this end the matrix is hung on the hook e and then shaped about the lateral curved frame members f and The lateral flanges g impart the correct lateral position to the matrix. Thereupon the head of the matrix is inserted into the groove is of the holder Z. The matrix is now correctly positioned on the frame and when the latter is swung into the casting box n it is obvious that the matrix will also be properly positioned in the box. The casting box is then closed by the'core 0 and the molten metal poured into the box. After the printing plate has set the core 0 with the casting box 02. Inasmuch as the deep depressions of the matrix are filled with. the

i set metal of the printing plate, the matrix as well as the frame and movable matrix holder Z and the printing plate held to the core 0 by the projections s will all be moved out of the casting box with the core 0.

The matrix continues to adhere to the effective face of the printing plate until the matrix holder Z is caused to separate the two by means of a stop parranged at both sides of the matrix frame on the casting box n.

I When the matrix has been released from the printing plate, the frame (owing to its wei ht) returns automatically into the casting ox carrying the matrix with it; the matrix being in proper position for another casting operation. If it.be desired to inspect or clean the casting bed prior to another casting operation, the frameand its appurtenant parts may be simply raised and again droppedinto position after completion of inspection or cleaning,

The stop 12 is pivotal about arid when the frame is inserted in the casting box the stop may move about its pivot andthus present 110' obstruction to theinsertion of the frame. After such movement the stop [9 is returned to its effective position by any suitable means such as a spring or counterweight 32 During removal of the frame from the casting box the stop 7 is held in position by the nose p and the matrix holder l engages a roller q carried at one end of thestop p and'is'moved to release the matrix from the printing plate.

Inasmuch as the matrix holder be movedsuiliciently far out until the matrix is entirely free, and furthermore as the matrix is held only by the hook a at such position at which the cast first sets, but is otl-ierwisc entirely free, it will be obvious that thematrix offers no resistance to the change in volume of the contracting printing plate, and hence the matrix will not be torn or otherwise injured. This is-true even if some of the molten metal has penetrated the matrix, because in this case the matrix (with its frame) is completely removed from the casting box, carefully freed from the metal and mended, if necessary, and then replacedfor further use.

I claim 1. Means for supporting a matrix in a casting box, comprising a frame having at one side thereof a projection for entering an orifice in the matrix, and at the other side a movable matrix holder.

2. Means for supporting a matrix in a casting box having a pivotal core, comprising a frame one side of which forms a closure for the box at the side of the pivotal axis of the core, said side of the frame having a projection for entering an orifice in the matrix, and a movable matrix holder at the side of the frame opposite that having said projection. I

3. Means for supporting a matrix in a casting box, comprising a frame having two opposed substantially straight sides, and two opposed curved sides, and a matrix holder movably mounted on one of the straight sides.

4. Means for supporting a matrix in a casting box, com rising a frame having two opposed substantially straight sides and two opposed curved sides, a projection on one of said straight sides to engage an orifice in the matrix, and a matrix holder associated with the other straight side of the frame.

"5. The combination with a casting box, of a matrix supporting frame movable into and out of the box, a matrix holder movably mounted on said frame, and means carried by the casting box, to effect movement of said holder and separate the matrix from a printing plate when the frame is moved out of the box.

6. The combination with a casting box having a core pivoted'thereto, of a matrix supporting frame pivoted to said box in the pivotal axis of the core, a matrix holder movable 011 the frame, and means at the opposite end of the casting box from the pivotal axis of the core and frame for moving the matrix holder to cause the matrix to release a printing plate.

,7. In an apparatus of the character de scribed, a casting box and a matrix-support: ing' frame pivotally associated therewith for bodily movement into and out of the box.

dli

llll' scribed, a casting box,

means carried by a matrix-supporting frame associated therewith for pivotal movement of the frame into and out of the box, and means carried by the frame for engaging both ends of a flexible matrix, whereby the latter may be applied and removed from said frame prior to the movement of the frame into the box.

9. I11 an apparatus of the character described, a casting box, a core pivotally associated therewith for movement into and out of the box, and a matrix-supporting frame mounted for similar pivotal movement about the same axis.

10. In an apparatus of the character described, a casting box, a matrix-supporting frame associated therewith for bodily movement thereof into and out the frame for engaging a flexible matrix, said means comprising a projection adapted to be inserted into an opening in the matrix, and a holder adapted to engage an edge of the matrix.

11. In an apparatus of the character demovement into and out'of the of the box, and.

scribed, a casting box, a matrix-supporting frame associated therewith for bodi 'ment thereof into and out of the means carried by y movebox, and the frame for, engaging a flexible matrix, said means comprising a holder adapted to engage an edge of the matrix, said holder being movablymounted with respect to the frame to permitrelative movement of the matrix and frame when the holder is moved. r

12. In an apparatus of the character described, a casting box,'a matrix-supporting frame associated with the box for pivotal able matrix holder on the frame, and means carried by the casting box for engaging the holder to move the latter when the frame is moved out of the box, said means comprising a relatively fixed element positioned to encounter the holder.

In testimony whereof I have aflixed my signature.

ADOLF- LEINWEBER.

box, a mov-