DE262503C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 262503 CLASS 11 b. GROUP

Addition to patent 220655.

Patented in the German Empire on August 10, 1912. Longest duration: January 28, 1924.

In the paper cutting machine according to patent 220655, the two cutting knives with which the front edges of the paper stacks clamped on the turntable are trimmed are attached to a common knife bar, which is mounted parallel to the other knife bar, which is used to trim the longitudinal edge of the stack. Since the cutter bar has to be guided at an angle in order to make a pull cut by means of inclined slots, links or the like, when two stacks are trimmed at the same time by the two knives attached to a common bar, the direction of the cut will be opposite to the clamped stacks of paper. If, for example, books are trimmed, the cutting direction will go from the book spine to the longitudinal edge of the book in the case of one stack and from the longitudinal edge of the book to the spine of the book in the case of the other stack. The latter cutting direction is disadvantageous because it can easily lead to the leaves tearing at the back. To eliminate this deficiency, the machine is designed according to the present invention so that the two in the same plane knives are carried by separate cutter bars, which are connected to the same upward and downward movement and are longitudinally displaced in opposite directions during these movements.
In the drawing, FIG. 1 illustrates 35

the top of the paper trimmer in elevation; Fig. 2 is a cross section through • the guide for the double cutter bar.

The knives i, k are carried by knife bars g, g 'which are separated from one another, but are guided between the walls e in the same plane. A crossbar m is placed through both cutter bars g, g ' , which is connected to the drive device by the tie rods η and sets the cutter bars g, g' in motion at the same time. On bolts 0, which pass through archers ^) the cutter bars g, g ' and are attached to the walls β , handlebars r, r' are rotatably mounted, which are connected to the cutter bars g, g ' by bolts s.

If the crossbar m is moved downwards by the tie rods η , during this downward movement the two cutterbars g, g ' are shifted in the opposite direction through the intermediary of the links r, r' , and the cutterbar g is shifted to the right, whereas the cutterbar g 'is shifted to the left. The clamped stacks of paper or books with their backs facing the axis of rotation of the table are consequently trimmed in the right way by each of the two knives, in that the draw cut runs from the book spine towards the longitudinal edge of the book, which prevents tearing and becomes one in all Parts smoother cut is achieved.

In the drawing it is assumed only as an example that the two cutter bars g, g ' receive their longitudinal movement through'handlebars; nothing stands in the way, for example, of using the oblique slots that are often customary.

Claims (2)

Patent-to sayings: i. Paper trimmer with three in ίο. Knives that work with pulling cut, which simultaneously trim three sides of a stack of paper clamped on a turntable, according to Patent 220655, characterized in that the two knives (i, k) arranged in the same plane are held by separate cutter bars (g, g ') , which during the Make an opposite longitudinal movement up and down. 2. Paper cutting machine according to claim i, characterized in that the cutter bars (g, g ') are moved by a common transverse bar (m) on which they move longitudinally during the upward and downward movement. 1 sheet of drawings.