US 2092568 A
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Description (OCR text may contain errors)
Sept. 7, 1937. F. R. BLELLUCHE SHEET TRANSFER FOR BRONZING MACHINES Filed Dec. 21, 1955 2 Sheets-Sheet l Sept. 7, 1937. F R BELLUCHE I 2,092,568 A SHEET TRANSFER FOR BRONZING MACHINES Filed Dec. 21. 1935' 2 Sheets-Sheet 2 E'iiY/f E BA /bah;
Patented Sept". 7, 1937 UNITED STATES PATENT oFFIcF.
SHEET TRANSFER FOR BRONZING MACHINES This'invention relates to printing machinery and refers particularly to bronzing machines. In
bronzing machines of the type shown in Patent I No. 1,869,403 issued to Frank R. Belluche August 2, 1932, the work is carried through the machine successively on a work cylinder generally referred to as the bronzing cylinder and a delivery cylinder. From the delivery cylinder, the completed sheets are received by a suitable delivery mechanism.
In the past difiiculty has been experienced in transferring the sheet from the bronzing cylinder to the delivery cylinder. The sheet transferring mechanism of the aforementioned patent provided a substantial improvement over past constructions, but even with this improvement the transfer of the sheet from the bronzing cylinder to the delivery cylinder was not completely satisfactory. The objection to the sheet transferring mechanism shown in the aforementioned patent resided in the fact that the bar used to hold the sheet againstthe bronzing cylinder during the interval in the transfer when the grippers of I neither cylinder held the sheet, formed objectionable impressions in the bronzed surface.
. It is therefore an object of this invention to provide improved means for holding the sheet onto the bronzing cylinder during the actual transfer thereof to the delivery cylinder, which means is so constructed as to entirely obviate the objectionable formation of marks on the bronzed surface by the elimination of all pressure applying means acting on the bronzed surface of the sheet. To this end, the bronzing cylinder is providedwith a friction surface to which the sheet will adhere during the actual transfer from one cylinder tothe other. r
It is also. an object of this invention to provide an improved construction for the grippers and an improved manner of mounting the grippers on theirrrespective cylinders so as to facilitate attachment and detachment thereof when necessary.
x .With the above and other" objects in view which will appear as the'des'cription proceeds,
this invention resides in the novel construction, combination and arrangement of parts substantially as hereinafter described and moreparticu- 'larly defined by theappended claims, it being understood that such changes in the precise embodiment of the hereindisclosed invention may be made as come within the scope of the claims.
The accompanying drawings illustrate one complete example of thephysical embodiment of theinvention constructed according to the best mode so far devised for thepractical application of the principles thereof, and in which:
Figure l is a side View of a bronzing machine embodying this invention, parts thereof being broken away and in section;
Figure 2 is an enlarged section view through the two cylinders showing the manner in which the sheet is transferred from one to the other;
Figure 3 is a view taken on the plane of the line 33 of Figure 2, said view showing the bronzing cylinder and having parts broken away to illustrate structural details; and
Figure 4 is a fragmentary perspective view of one end portion of the friction covering for the bronzing cylinder illustrating its manner of attachment.
Referring now particularly to the accompanying drawings in which like numerals indicate like parts throughout the several views, the numeral 5 represents the frame of a conventional bronzing machine having a bronzing cylinder 6 and a delivery cylinder 1.
As is customary in bronzing machines of this type, the work is carried into the machine on a conveyer 8 and clamped to the bronzing cylinder by. grippers, indicated generally by the numeral 9, so as to travel with the bronzing cylinder under a dusting roll II). The dusting roll l5) deposits bronze powder from a fountain or magazine I! onto the surface of the sheet to be rubbed into the surface of the sheet by a rubbing pad l2. Cleaning rolls I3 brush off the excess powder, which is carried away pneumatically.
Both cylinders have longitudinal grooves or channels I4 in which their gripper mechanism is located. The gripper mechanisms, indicated generally by the numeral I5, are alike in both cylinders. They comprise longitudinal bars or rails l6 extending along one side of the groove or channel I4, and mounted therein to rock on their longitudinal axes. The specific manner in which the bars I6 are mounted forms no part of this invention.
Attached to one face of each bar It is a longitudinally extending strip H to which the gripper fingers 9 are directly attached. So that the individual gripper fingers may be readily detached, they are held in place by spring urged cross pieces or arms l8 in a manner such that each arm holds two gripper fingers. The cross pieces I8 are. secured to the strip l I by screws or pins l9 which have springs 20 mounted thereon and interposed between their heads and the arms I8 so as to yieldably urge the arms toward the grippers and thereby hold the same against the strip il Mounted on the bar it between the extreme inner ends of the gripper fingers and the bars is are knife edges 21 which coact with the spring urged arms 98 to properly position the gripper fingers and provide fulcrums about which the fingers may rock.
The outer ends of the gripper fingers are curved as shown and have sheet engaging hooks 22 adapted to project through the large part of T-shaped slots 28 formed in a bar 24S secured to each cylinder adjacent one side of the longitudinal groove or channel M. Through the coaction between the outer ends of the grippers 22 and the edges of the smaller parts of the T-shaped slots iii-i, the sheets are held in place, the springs Ell allowing the fingers to act independently and compensating for different paper thicknesses.
The outer surfaces of the bar E i are curved to continue the curvature of the cylinders, and cooperating with the bar 24 in closing the channels i iare curved cover plates 35 which, like the bar 2 form substantially continuations of the cylindrical surfaces of the cylinders. The cover plates 25 are removably secured in position by screws 2 3.
The surfaces of the cylinders are thus substantially unbroken, the only openings visible being a portion of the T-shaped slots 28 through which the outer ends of the gripper fingers project to act on and grip the sheets of paper. It is of course understood that the grippers on one cylindeer are staggered with respect to those of the other, or in other words, are interposed between those of the other.
To open and close the grippers, the longitudinal bars l8 are rocked on their axes by means of cams at the ends of the cylinders, one of which is shown in Figure 3 at 21.
Tracking on these cams are rollers 28 carried by arms attached to the shafts which mount the bars l6, and to hold these rollers 28 onto the earns 27, compression springs 29 are provided. The cams are so timed as to properly open their respective grippers to effect the transfer of the sheet from the bronzing cylinder to the delivery cylinder, and also to open the grippers on the bronzing cylinder in time to receive the sheets being fed into the machine, and to open the grippers on the delivery cylinder in time to discharge the sheets onto the delivery mechanism, not shown.
During the transfer of the sheet from the bronzing cylinder to the delivery cylinder, the grippers on the bronzing cylinder open first and shooflies 30 formed on the grippers 9 and taking up the space provided by the small parts of the T-shaped slots 23 push the adjacent leading edge of the sheet away from the bronzing cylinder toward the delivery cylinder into position to be gripped by the grippers on the delivery cylinder as clearly shown in Figure 2.
As will be readily apparent, for a slight interval during the transfer of the sheets, they are not held by either set of grippers. This condition is illustrated in Figure 2. During this interval, unless some other means is provided to hold the sheets, they may be pulled out of position by the cleaning rolls. Some means must therefore be provided to hold the sheets during this period of transfer, and heretofore, the best means provided for this purpose involved pressure applying mechanism by which the sheet was forcibly held against the bronzing cylinder. The aforesaid Patent No. 1,869,403 is an example of such past constructions. Pressing the sheet against the bronzing cylinder necessitated engaging the bronzed surface of the finished sheets and this resulted in the formation of objectionable marks in the bronzed surface.
The present invention obviates this objectionable feature of past constructions by holding the sheet onto the bronzing cylinder by friction so that only the back of the sheet is engaged. To this end the bronzing cylinder has its surface covered with a suitable friction material 3 I, preferably cork. One edge of the sheet of cork is securely glued or otherwise attached to a strip 32 mounted in a recess in the bar 24 carried by the bronzing cylinder. In this manner, one edge of the cork sheet is securely anchored to the bronzing cylinder adjacent one side of the longitudinal groove or channel Hi.
The other longitudinal edge of the cork covering is clamped between strips 34. These strips 34 together form a rigid bar which is mounted in a narrow groove 35 adjacent the groove or channel l4. Adjusting screws 36 threaded into the bottom of the groove 35 and having octangular enlargements 3'! formed on their headed. ends and bearing on the outer face of the bar 34| provide convenient means for tensioning the cork covering. It will be seen that at all times one of the flat faces of the enlargements 31 will be in engagement with a side of the groove 35 to prevent the screw from turning. However, when adjustment is necessary, the screw is bent away from that side of the groove sufiiciently to turn ,the screw. When the desired adjustment has been achieved, the screw springs back into its original position and again one of the flat faces of the enlargements 3'! will engage the side of the groove to prevent turning of the screw. The groove 35 and the adjusting screws 36 are all covered by the cover plate 25.
In practice, it has been found that a cork facing of the proper thickness securely holds the sheets during their transfer from the bronzing cylinder to the delivery cylinder and thus obviates the necessity for all other holding devices that might have an objectionable marking effect on the bronzed surface.
From the foregoing description taken in connection with the accompanying drawings, it will be readily apparent to those skilled in the art, that this invention provides simple and effective means for insuring proper sheet transfer from one cylinder to the other, and particularly from the bronzing cylinder to the delivery cylinder of a bronzing machine, by which objectionable markings on the bronzed surface are entirely obviated, and that the manner of mounting the grippers provided herein makes their attachment and detachment a simple matter.
What I claim as my invention is:
1. In combination with a pair of cylinders having grippers adapted to clamp a sheet thereto whereby the sheet is movable therewith, means for actuating said grippers to transfer the sheet from one cylinder to the other, and means on one of the cylinders for holding the sheet thereto by frictional engagement with the sheet during the actual transfer of the sheet from said cylinder to the other cylinder.
2. In a printing machine having a pair of cylinders arranged to successively carry a sheet through the machine, grippers on the cylinders to clamp the sheet thereto, means for actuating the grippers so as to effect a transfer of the sheet from one cylinder to the other, and means on the first designated cylinder to cause the sheet to frictionally adhere thereto during the actual transfer from said cylinder to the other cylinder at which time the grippers of neither cylinder hold the sheet.
3. In a bronzing machine having a bronzing cylinder and a delivery cylinder adapted to successively carry sheets through the machine and having means to apply bronze to the sheets while carried by the bronzing cylinder, grippers on the cylinders adapted to hold the sheets thereto, means for opening the grippers and for effecting a transfer of the sheets from the bronzing cylinder to the delivery cylinder, and means carried by the bronzing cylinder to engage only the back of the sheet for frictionally holding the sheet to the bronzing cylinder during its transfer to the delivery cylinder at which time the grippers of neither cylinder hold the sheet.
4. In a bronzing machine having a bronzing cylinder and a delivery cylinder adapted to successively carry a sheet through the machine and having means for depositing bronze onto the sheet while on the bronzing cylinder, grippers carried by the cylinders adapted to clamp the sheet thereto, means to actuate the grippers so as to effect a transfer of the sheet from the bronzing cylinder to the delivery cylinder, and replaceable friction means on the bronzing cylinder engaging only the back of the sheet to cause the sheet to adhere to the bronzing cylinder during the transferring interval at which time the grippers of neither cylinder hold the sheet.
5. In combination with a pair of cylinders in rolling engagement and adapted to successively carry a sheet, grippers on the cylinders to clamp the sheet thereto, means for actuating the grippers toefifect a transfer of the sheet from one cylinder to the other, a surface covering of material having a high coefficient of friction on the cylinder which first carries the sheet whereby the sheet is held frictionally on said cylinder during the transferring interval when the grippers of neither cylinder hold the sheet.
6. In combination with a pair of cylinders in rolling engagement and adapted to successively carry a sheet, grippers on the cylinders to clamp the sheet thereto, means for actuating the grippers to effect a transfer of the sheet from one cylinder to the other, and a covering of sheet cork having a high coefficient of friction on the cylinder which first carries the sheet whereby the sheet is held frictionally on said cylinder during the transferring interval when the grippers of neither cylinder hold the sheet.
7. A bronzing cylinder for bronzing machines and the like adapted to carry sheets to be bronzed, said cylinder having a longitudinal groove in its surface, grippers mounted within said groove with the outer ends thereof projecting therefrom to grip and clamp a sheet to the cylinder, a surface covering for the cylinder of material having a high coefficient of friction, means disposed in said longitudinal groove for holding said covering snugly about the cylinder, and means to close the groove and form substantially'a continuation of the cylindrical surface of said covered cylinder.
8. In a bronzing machine, a bronzing cylinder adapted to carry sheets to be bronzed, said cylinder having a longitudinal groove opening to its cylindrical surface, grippers disposed within the groove and having outer end portions projectible from the groove to clamp a sheet to the cylinder, a sheet of cork encircling the cylinder with its longitudinal edges adjacent the sides of the groove, means on said longitudinal edges of the cork sheet and disposed within said longitudinal groove for holding the cork sheet on the cylinder, and cover means for the longitudinal groove enclosing the grippers and forming substantially a continuation of the cylindrical surface of the covered cylinder.
9. In a bronzing machine, a bronzing cylinder adapted to carry sheets to be bronzed, said cylinder having a longitudinal groove opening to its cylindrical surface, grippers disposed within the groove and adapted to clampa sheet to the cylinder, a sheet of flexible material having a high coefficient of friction wrapped about the cylinder with its longitudinal edges adjacent the sides of the groove, means at one side edge of the groove to which the adjacent longitudinal edge of said friction sheet is permanently secured to be fixedly secured to the cylinder, means attached to the other longitudinal edge of the friction sheet and recessed into the cylinder adjacent the other side of its longitudinal groove, adjustable tensioning means engaging said last named means whereby the sheet may be drawn taut about the cylinder, and a cover closing the longitudinal groove and covering the grippers and said adjustting means, said cover having its outer surface shaped to form substantially a continuation of the cylindrical outer surface of the covered cylinder.
FRANK R. BELLUCHE.