US1945671A

US1945671A - Plate-locking mechanism

Info

Publication number: US1945671A
Application number: US600444A
Authority: US
Inventors: Wood Henry A Wise
Original assignee: Wood Newspaper Machinery Corp
Current assignee: Wood Newspaper Machinery Corp
Priority date: 1932-03-22
Filing date: 1932-03-22
Publication date: 1934-02-06
Anticipated expiration: 1951-02-06

Description

H. A. W. WOOD PLATE LOCKING MECHANISM Feb. 6, :1934.V

Filed Maron :22, 1932 vn@ .N NI Q. 2

,EEE u Patented Feb. 6, 193,4

UNITED .STATES 1,945,611 PLATE-LoCKING MECHANISM Henry AA. Wise Wood, New York, N. Y., assigner to Wood Newspaper Machinery Corporation, New York, N. Y., a corporation of Virginia Application March V22, 1932. Serial No. 600,444 7 claims. (cl. 1014-378)` The principal object of this invention is to provide means whereby a printing plate by its longitudinal motion on the plate cylinder will itself produce a clamping action, preferably-both at the head and foot of the plate. Another object of the invention is to provide a very simple and convenient device in which the plate cooperates with the margin bar for producing the above mentioned result.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawing, in which Fig. 1 is an outside elevation of one side of a printing plate constructed to operate in accordance with this invention;

Fig. 2 is an end view of the same as indicated by the arrow 2 in Fig. 1;

Fig. 3 is an edge view of the same, looking in the direction of the arrow 3 in Fig. 1;

Fig. 4 is a plan of a part of the margin bar showing two plates in unclamped position;

Fig. 5 is asimilar view showing the plates in clamped position;

Fig. 6 is an end view of the same parts;

Fig. 7 is a sectional view taken radially with respect to the cylinder, showing two plates arranged longitudinally in unclamped position, and

Fig. 8 is a similar view showing these plates after they are clamped.

1929, Serial No. 353,201, in which the plate is held down on what is called the head and foot thereof by ledges carried by the margin bar. In that case the movement of the plate into clamping position did not affect the holding down of the plate along its head and foot.

This invention relates to that general type of plate-locking mechanism but including the added feature of a construction whereby when the plate is moved longitudinally on the cylinder by the clamping means into its final position, this longitudinal motion of the plate by itself causes the plate to be held securely against the cylinder by the margin bar at the head and foot of the late. p Each plate P' and P2 carries a projection l0 along each opposite straight surface, that is, the

head and foot. This projection, of course, is ar- I have previously filed an application April 6,

the inner end of the plate, that is, the end of the plate that extends toward the center ring 11.

The cylinder is provided with the usual stationary center ring l1, movable center clip 12 and end clamp 13. They can be operated in any desired way, but the invention is shown as applied to the type of clamp in which the plates are put on loosely as shown in Fig. 7 and the end clamp is screwed vup to force the plate P2 up against the center clip and'then force that by the plate P2 up against the plate P' until finallyv 55 the latter is locked at the other end under the center ring.

It will be seen that this slant on the wedge l0 is in the direction of motion of these plates. Now the longitudinal margin bar 14 is provided on op-l 70 posite sides with longitudinal projections 15 having under slanting surfaces complementary to the slanting surfaces of the projections 10 on the plates and adapted to overlap the same. It is not necessary that the projections on the plates be entirely out of line with the margin bar when the plate is placed on the cylinder, because the plates are placed on the cylinder in a direction parallel with the underside of the margin bar.

It will be obvious therefore that when the plates are moved up, as just described, into clamping position, the projections 10 will Wedge the plate under the edges or projections on the margin bar by the motion of the plate in a longitudinal direction. If these elements are provided on both sides, that is, the head and foot, the plates are held down against the cylinder at one or more points between their ends merely by the usual locking motion. No additional mechanism is required to secure'this result and the locking is accomplished in the most rm and rigid manner. The position of the clamped plates is shown in Fig. 8 and the detail of this new locking means in Fig.'5. 95

The form shown herein is extremely simple for securing the desired result and I am aware of the fact that other equivalent constructions can be employed for the same purpose without departing from the scope of the invention as expressed in the claims. Therefore I do not wish to limit myself to the exact form shown, but what I claim 1. In a plate clamping device, the combination with means for moving a plate longitudinally on 105 a plate cylinder up to clamping position at its circular ends, of means whereb v the motion of the plate into clamping position will clamp down its straight edge against the cylinder.

2. The combination with a plate clamping deno vice by which a stereotype plate is clamped at its circular ends by a longitudinal motion along the cylinder on which it is located, of' means whereby the operation of the clamping of the plates at its ends will also clamp the plates down at its head and foot on the cylinder.

3. In a plate clamping device, the combination with a plate cylinder, its stationary center ring, its longitudinal movable center clip and its end clamp, of means whereby when the end clamp is moved to force two plates on the cylinder into clamping positions on the cylinder, the head and foot of each plate will be clamped down thereby against the cylinder.

4. The combination with a plate cylinder and its margin bar, of a plate having a wedge-shaped projection extending under the margin bar, the margin bar also having a complementary wedgeshaped surface engaging said projection, whereby the motion of the plate longitudinally will force the plate firmly into contact with the cylinder by the co-action of said Wedge-shaped surfaces.

5. The combination with a printing plate cylinder and a margin bar having' two opposite projections along its sides provided with surfaces underneath which are slanting with respect to the axis of the cylinder, of printing plates on opposite sides of the margin bar having Wedgeshaped projections adapted to be forced down by the projections on the margin bar when the plate is moved longitudinally on the cylinder to clamping position.

6. As an article df manufacture, a printing plate having a longitudinal projection on its straight edge of tapering shape at its outer surface.

.7. The method of clamping down the head and foot of a printing plate on a printing cylinder, which consists in moving the plate longitudinally on the cylinder to clamping position and causing the longitudinal motion of the plate to force its head and foot rmly against the cylinder at points part way between the curved ends of the plate.

HENRY A. WISE WOOD.