US1173363A - Curving-machine. - Google Patents

Description

W. W. MCCARROLL.

CURVING MACHINE.

APPLICATION FILED DEC. I9. I9II.

l, l 73,363. Patented Feb. 29, 1916.

2 SHEETS-SHEET 2.

Wm, g mee/MMM WALKER W. MCGARROLL, OF ARLINGTON, NEW J ERSEY.

CURVING-MACHINE.

Specification of Letters Patent.

Patented Feb. 29, 1916.

Application filed December 19, 1911. Serial No. 666,785.

To all 'whom t may concern Be it known that I, WALKER W. MCCAR- ROLL, a citizen of the United States of America, and a resident of Arlington, I-Iudson county, New Jersey, have invented certain new and useful Improvements in Curving-Machines, of which the following is a specification.

This invention relates to machines for curving electrotypes or stereotype plates for use on printing machines.

More particularly the invention relates to a curving machine of the type shown in my Patent Number 974,288 and the object of the invention is to improve the construction of the machine and to provide means for preventing stretching of the plate and bulging or cracking while thel curving is being done.

To this end the invention comprises such features and elements as are hereinafter set forth while reference is had to the accompanying drawings in which- Figure 1 is a central vertical sectional view of a machine embodying the invention. Fig. 2 is a plan view of the machine. Fig. 3 is partly an end View and partly a` sectional view of the machine, and Figs. 4 and 5 show a modification.

In the drawings the reference numeral 5 represents the base of the machine made in any suitable form, adapted to be fixed to a. table or the like, or it may be made movable if desired. At the front the base is cut out as at 6 and at the rear a depression 7 is provided.

8, 8 are guide rails on each side of the base which extend from the front to near the rear end as shown in Fig. 2. On the said rails on each side of the machine move the cylinder bearing standards 9, 9, each of which is provided with a groove 10 to fit over the rail as shown in Fig. 3. A cylinder 11 is rotatably mounted in the said bearing standards by means of a 'cylinder shaft 12 to which the cylinder is secured. At one end a hand wheel 18 is secured to the shaft 12. Between the cylinder and the bearing standards the shaft 12 carries gears 14, 14 which mesh with racks 16, 16 secured to the base. rThe racks extend so far to the rear that the cylinder may be rotated about one half revolution at the least.

17 represents a iieXible steel sheet. The

rear end of this is secured to the base by means of lug bolts 18 which pass through a wall 19 of the base. Outside the wall the bolts carry springs 20. The front end of the sheet is secured to the cylinder 11 by screws 21. A curved front plate stop 22 is interposed between the sheet and the cylinder and is carried to the rear beyond the vertical aXis of the cylinder. 28 is a narrow plate which overlaps the front plate stop at 24. By these means the curving of the plate 25 commences right at the edge thereof and denting of the sheet is also prevented.

The plate 25 to be curved is laid on the sheet with its front edge against the plate stop 22. Then by operating the handle 18 the cylinder is rolled to the rear or the left in the drawing by the action of the gears and the racks and the plate is curved around the cylinder in an obvious manner. By so curving the plate no provision is made against the stretching thereof. The stretching of the plate is a source of great annoyance and trouble, so much more as all plates do not stretch the same, hence trouble is experienced in locking the plates to the cylinder of the press. To obviate this trouble and to insure that the plate shall not stretch while it is being curved I have provided a back plate stop device and means for operating the same so as to confine the plate between the two plate stops mentioned while the curving ,takes place, and whereby the stretching becomes impossible.

The back plate stop device comprises the back stop 28 itself which is pivoted at 29 to a stopearrier 30. This latter is operable by means of a screw 81 which passes through the base wall 19 and which is in threaded engagement with the carrier 80. Thus when the screw is rotated the carrier and with it the stop 28 are moved back or forth to accommodate the plate 25 between the two stops 22 and 28. The latter is pivoted to adjust itself to the rear edge of the plate as the edges of the plate are not always parallel. The back stop is operated from a hand wheel 34 through the instrumentality of' a shaft 35 carrying a bevel gear 36 which meshes with a bevel gear 87 on the screw 31. A brace 38 may be provided for the carrier to slide on. f

It will be seen that the plate 25 is firmly lodged on the sheet between the two stops.

Hence when the curving takes place the plate cannot stretch as neither of the stops can move with relation to the sheet.

In case the plate is eXtra long or for other reasons it may bulge or crack between the stops as the curving operation commences or during the same. To guard against this I provide a cover plate 40 heavy enough to prevent such bulging or cracking of the plate 25. The plate 40 has ashaved off end 41 so as to be placed as near the cylinder as possible and is further provided with a rack 42 meshing with a gear 43 on a shaft 44. A hand wheel 45 is fast on the latter and by turning the hand wheel the plate 40 is moved forwardly into the position shown to cover the plate 25. On each side near the front the cover plate carries an adjustable stop 46 in stop blocks 47 having an inclined surface 48.

The aforesaid bearing standards 9 carry each a rear arm 49 which supports a buffer member 50, which latter engages the inclined surface 4S and is gently raised until the stops 46 abut the arms 49 when the forward movement of the cover plate ceases without jar. Vhen, however,.the plate 25 is to be curved and the cylinder is rotated leftward or to the rear, the arms 49 push the stops 46 and the cover plate 40 before them whereby the latter is moved out of the Way of the cylinder though all the time covering the uncurved portion of the plate 25, and preventing bulging of the latter. During this movement the shaft 44 is rotated idly to the left. The shaft 44 is supported in floating bearings 52 one on each side carried in the fixed bearings 53. Springs as 54 press the bearings 52 and the shaft 44 downward, thus exercising a pressure on the cover plate 40. The latter is guided in guide blocks 55 as seen in Fig. 8 through which the shaft 44 passes. 56 are adjustable stops to limit the upward movement of the bearings 55. After the plate is curved and the cylinder is again moved forward or to the right, the cover plate remains in its rear position so as to permit the curved plate to be taken away. A cover plate such as shown may be used substantially .in the same manner to great advantage on, for instance` shaving machines for shaving the plates before they are curved.

In cases where only short plates are to be curved or for other reasons the cover plate is not needed, I may construct the back stop device as shown in Figs. 4 and 5 in which the device is placed above the metal sheet 59. In this instance the stop 60 is pivoted at 6l to the carrier 62 which is provided with arms 63 guided in the'base at 64, 64. The carrier is operated by a screw' 65 having a hand wheel 66. The screw passes through a block which in this instance is secured to the sheet 59 by screws 68. The forward end of the sheet is fastened to the cylinder` in a i be rotated by a hand wheel 74. The'plate 7 5V is placedbetween the stops 60 and 69 as before and the cylinder is rotated whereby the sheet is dragged to the right and wrapped around the cylinder carrying the plate and the back stop with it. On the return stroke the sheet is unwrapped and pushes the back stop away from the cylinder, and to insure this IV provide a semi circular guide 76 for the cylinder adjustable by a screw 77 in a block 78 of the base.

In a case as in Fig. l where the rear end of the sheet is secured to the base I may place the back stop device on top of the sheet as shown in Fig. 4 where no cover plate is wanted.

It will be seen that I have provided simple and easily operated means for curving the plates and at the same time prevent them from stretching or bulging, whereby a great saving is effected in time and labor and better plate work is obtained.

Changes may of course be made in the detailed construction shown and described and I claim all such changes as come within the scope of the invention and the appended claims.

I claim z- 1. In a machine of the character described the combination of a cylinder, a sheet, means for positioning a plate to be curved on the said sheet, said means comprising a front stop carried by the cylinder, a rear stop, means for operating the latter, means for operating the said cylinder and sheet to curve the said plate and a cover plate for preventing bending of the uncurved portion of the said plate while the latter is being curved.

2. In a machine of the character described the combination of a cylinder, a sheet attached to the same, means for positioning a plate to be curved on the said sheet, said means comprising a front plate said cylinder, arear preventing bending of the uncurved portion of the plate while the latter is being curved and means for operating the said cover plate away from and toward the cylinder.

3. Plate curving means of the character described comprising in combination a support, a cylinder mounted to rotate upon said support, a sheet secured to the latter and the said cylinder for curving the plate around the latter, a front plate stop secured to said cylinder between the same and the said sheet, a rear plate stop secured to the said support on top of the said sheet and means for operating the said cylinder.

4. Plate curving means of the character described comprising in combination a support, a cylinder mounted to rotate upon said support, a sheet secured to the latter and the said cylinder for curving the plate around the latter, tension members interposed between the said sheet and the said support, a front plate stop secured to said cylinder between the same and the said sheet, a rear plate stop secured to the Said support on top of the said sheet and means for operating the said cylinder.

5. Plate curving means of the character described comprising in combination a sup- Copies of this patent may be obtained for port, a cylinder mounted to rotate thereon, a sheet secured with its one end to the said cylinder and with its other end to the said support and adapted to lie Hat on the latter, tension members interposed between said sheet and the said support, a front plate stop secured to said cylinder and interposed between the latter and the said sheet, a rear plate stop mounted on said support and resting on top of the said sheet, means for adjusting said rear stop and means for operating said cylinder.

Signed at New York, N. Y. this 13th day of December, 1911.

WALKER W. MCCARROLL.

Witnesses:

K. G. Ln ARD, IVAN KONIGSBERG.

five cents each, by addressing the Commissioner of Eatents,

Washington, D. C.

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