US2097875A - Slicing machine construction - Google Patents

Description

Nov. 2, 1937. L, FEREQC. 2,097,875

SLICING MACHINE CONSTRUCTION Original Filed April 29, 1931 INVENTOR PM A TORNEY Patented Nov. 2, 1937 PATENT OFFECE SLICING MACHINE CONSTRUCTION Lester Ferenci, Brooklyn,

N. Y., assignor to American Machine & Foundry Company, a corporation of New Jersey Original application April 29, 1931, Serial No. 533,829. Divided and this application July 3,

1935, Serial No. 29,688

3 Claims.

This invention relates to a slicing machine construction, particularly one for cutting loaves of bread into individual slices, as per example in connection with a bread wrapping machine. This application constitutes a division of my copending application Serial No. 533,829, filed April 29, 1931, entitled Slicing attachment for bread wrapping machines.

The principal object of the invention is to provide an improved mounting for the slicer blades, and in particular to provide for quick and convenient removal of the slicer blades in slicing machines of this type.

Another object is to provide an improved slicer blade for bread slicers and the like which will more rigidly and securely hold the blade and will lend itself to the ready detachment above referred to.

To these ends, it is a feature of the invention to provide a slicer blade having a rigid pin or lug projecting from the blade and adapted to be received in grooved lugs in the slicer frame, and also to provide said blade with an aperture furnishing a transverse surface for engagement with a special tool which may be hooked into engagement with said surface to detach and replace blades. To facilitate this operation and also to keep the blades at the proper tension, the blades at their lower ends are resiliently mounted.

With these and other objects not specifically mentioned in View, the invention consists in certain constructions and combinations which will be hereinafter fully described and then specifically set forth in the claims hereunto appended.

In the accompanying drawing in which like characters of reference indicate the same or like parts,

Fig. 1 is a side elevation, partly in section, illustrating the improved slicing machine construction;

Figs. 2 and 3 are detail views in side elevation showing the improved blade mount and method of removing blades; and

Fig. 4 is a detail view in front elevation of the parts shown in Figs. 2 and 3.

Referring to Fig. 1 of the drawing, the frame I0 supports a motor l I having shaft extensions I3 on which are mounted eccentrics having an eccentric rod 52 driving the slicer frame l8 and an eccentric rod 53 driving the slicer frame 25. In the arrangement shown in Fig. 1, the slicer frames l8 and 25 are driven by an eccentric on one side of each slicer frame. The eccentric rod 52 is pivotally connected with the slicer frame l8 by means of a bar It having a nut threaded thereon which also holds eccentric rod 53 and frame I8 to a guide lever 20 mounted on a shaftZl supported in bearings of frame In. The upper end of frame i8 is pivoted to a pair of spaced swing levers 23 which are loosely mounted on a shaft 24 carried in bearing brackets of supporting frame ID.

The eccentric rod 53 is pivoted tov the lower end of a second slicer frame 25 by means of a bolt 26 which also holds eccentric rod 53 and frame 25 to a guide lever 21 mounted on a shaft 28 supported in bearings of supporting frame In. Similarly, the upper end of frame 25 is supported by a pair of spaced levers 29 at either side of said frame pivoted on the shaft 24,

Both slicer frames l8 and 25 are equipped at their upper ends with blade supporting lugs 30 and carry at their lower ends tension levers 3| with each of which engages a tension spring 32 fastened to the respective frame. Knife or saw blades 33 having pins 34 and 35 are placed into the frames l8 and 25, the upper pins 34 resting in grooves of the supporting lugs 30 while the lower pins 35 engage with grooves in the tension levers 3| so that each blade has the proper permanent longitudinal tension.

Above their upper pins, the saw blades 33 are provided with a hole 36 by which it is possible to insert or remove the blades in an easy and convenient manner by means of a special tool, as shown in Figs. 2, 3, and 4, consisting of a sickleshaped lever having a sidewardly projecting pin at its working end. For the removal of a blade from either frame, the end of tool 31 is placed with its convex side on top of the slicer frame and with its pin 38 in engagement with the hole 36 of blade 33, as shown in Fig. 2, when movement of lever 31 in the direction of the arrow lifts pin 34 out of lug 30 and pushes blade 33 outward at the same time, thus unlocking it from its slicer frame.

To insert a new blade, the curved end of the tool 31, with the new blade 33 suspended from the pin 38 thereof, upon hooking the lower pin of the blade into the groove of its tension lever, is placed with the concave side upon the slicer frame, as shown in Fig. 3, when movement of lever 37 in the direction of the arrow lifts the blade and draws it inward so that its upper pin 34 engages with the groove of lug 30 upon releasing the tool.

The construction of the slicer frames [8 and 25 permits the close approach of two sets of blades which avoids the tendency to rotate the loaf about its longitudinal axis when the oppositely moving sets of blades are spaced sufficiently to engage Cir the loaf behind and in front of its longitudinal axis during its passage through the blades. The blades on one frame are staggered the thickness of one slice with respect to blades on the other frame and the blades on each frame are spaced the thickness of two slices. With this arrangement, the advantage is gained that the side pressure of the blades in each set caused by compression of the slices due to the thickness of the blades, is sustained by the thickness of two slices of bread, thus eliminating crooked or uneven cuts. Another advantage of this arrangement is that the friction of the knives in the loaf and, therefore, the power consumption is greatly decreased. This may be explained as due to the diminished compression of the slices.

With respect to the formshown in Figs. 1-4 it should be noted that in order to reduce Vibration and thus make possible greater speed and output, the two frames !8 and 25 are oppositely reciprocated so that they counterbalance each other. For the same reason oppositely disposed eccentrics lita and i321 are connected to each of the side frames as shown. jWhile the eccentrics are substantially opposite, their centers 13c and l3d vary from diametric opposition by an angle approximately equal to the angle between the diverging eccentric rods 52 and 53 equal, in the embodiment illustrated, to- 19 degrees. This is done in order that the one frame shall start down at the exact moment that the other frame starts up as instead of 19 degrees after as would be the case if the diverging direction of thrust of the eccentric rods were not ta en into account. Thus, the reciprocating movements of the frames and connecting rods to each frame are equal and opposite and coincident as tov time, producing the conditions most favorable to eliminating vibration.

As shown inFigs. 2, 3, and 4, the pins 3:3 are cross pins projecting to either side of the plane of the fiat slicer blade 33 and the pins 3t engage in spaced lugs 30 to either side of the plane of the slicer blade.

What is claimed is:

1. A knife blade for bread slicing machines comprising a thin fiat elongated body with a sharpened edge, having cross pins rigidly fixed in the blade near each end thereof and extending substantially at right angles to the plane of the blade to either side thereof for securing the same to a knife support having spaced lugs for supporting the pins at either side of the blade so as to prevent pivoting of the blade transversely of its plane adjacent the pins, said blade having an aperture adjacent one end of the blade in the portion of the blade between the end of the blade and the pin nearest said end, for engagement with a blade removing or replacing tool.

2. A knife blade for bread slicing machines comprising a thin fiat elongated body with a sharpened edge intermediate the ends thereof, and having unsharpened end portions, cross pins rigidly fixed in said blade at the unsharpened end portions thereof, one of said pins being spaced a I greater distance from the end of the blade than the other, said pins extending substantially at right angles to the plane of the blade on either side thereof for securing the same to spaced lugs at either side of the blade so as to prevent lateral pivoting thereof, said blade having a hole through the portion of the blade between the blade end and the pin which is at a greater distance from said blade-end for facilitating blade removal.

3. A knife blade for bread slicing machines comprising, a thin, fiat, elongated body with a sharpened edge, having cross pins rigidly fixed in the blade in each end portion thereof, and extending substantially at right angles to the plane of the blade to either side thereof for securing the blade in operative position in a knife support having spaced lugs for supporting the pins at either side of the blade so as to prevent pivoting of the blade transversely of its plane adjacent the pins, said blade having an aperture'in an end portion near the end of the blade and adjacent the pin in said portion, said aperture providing means for engagement by a tool for replacement or removal of said blade.

LESTER. FERENCI.

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