US851057A - Razor-blade-grinding machine. - Google Patents

Description

No. 851,057. PATENTED APR-23,1907.

F.W.BLASBERG. V

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F. w.; BLASB-ERG. RAZOR BLADE GRINDING MACHINE.

.APPIJIOATION FILED APR.2, 1904.

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, FRIEDRICH WILHELM BLASBERG, OF HAAN, GERMANY.

RAzOR-BLADE-GFllNDlNG MACHINE.

No. 851,057. Specification of Letters Patent.

Patented April 23, 1907.

Application filed April 2, 1904. Serial No. 201,291.

To all whom it may concern:

Be it known that I, FRIEDRICH WILHELM BLASBERG, a subject of the Emperor of Germany, and a resident of Haan, Province of the Rhine, in the Empire of Germany, have invented certain new and useful Improvements in or Relating to Razor-Grinding Machines, of which the following is a specification.

The present invention relates to a new compound motion of the blade-support and to spring-controlledlaterally-adjustable bearings for the spindles of grinding-rolls in razorgrinding machines.

A razor-grinding machine according to this invention is illustrated, by way of eX- ample, in the accompanying drawings, of which Figure 1 shows a razor-grinding machine according to this invention in side elevation. Fig. 2 shows a front elevation of the same, partly in section. Fig. 3 is a cross-sectional view on the line A A of Fig. 1; Fig. 4, a section on the line B- B of Fig. 1; Fig. 5, a section on the line C C of Fig. 4, and Fig. 6 a section on the line D D of Fig. 1. Fig. 7 is a plan of the part of the machine shown in Fig. 6; and Figs. 8 and 9 show, respectively, the paths of a point of the blade in hitherto existing grinding-machines and in a grindingmachine according to this invention.

The hollow grinding of razor-blades used to be effected on the machines hitherto used by causing the blade-support to swing to and froin an arc of circle between the grindingrolls and by gradually advancing them in the plane of oscillation either by hand or automatically. The path thus traveled by a point on the blade is illustrated in Fig. 8. This complicated and tedious process has been greatly simplified and shortened by the construction according to this invention by combining the total amount of the gradual advance with the circular movement of the blade support. While the said support swings once to and fro in an arc, the advance simultaneously takes place by an up-anddown movement of the blade-support in vertical direction. Owing to this, each point of the blade will describe a curved path, as shown in Fig. 9.

In order to facilitate the removal and introduction of the blade between the grindingrolls, these rolls are made laterally movable by means of two double levers actuated by rods operated by treadles.

In order to bring about the double movement of the blade-supports, which is one of the features of this invention, a pulley 36 is mounted in proximityto the driving-pulley 26 on the main shaft 25, supported under the machine-bed, the said pulley 36 transmitting motion to a pulley 38, carried by a depending bracket 37. Another pulley 39, mounted on the same spindle as the pulley 38, drives a ulley 40, mounted on the spindle 42 of the ell-crank lever, by means of the belt 43.

The bell-crank lever 29, carrying the bladesupport 30, has its fulcrum in an eccentric 41 and is caused to move by the latter, the free arm of the bell-crank lever being connected to an eccentric 27 of the main shaft 25 by means of an intermediate rod 28. The eccentric 27 causes the blade-support 30, and therefore the blade 31, to move in an arc of a circle. (Shown dotted in Fig. 5.) The pivot-pin 42 of the bell-crank lever 29 under the influence of the two eccentrics 27 and 4]. describes an elliptical path, and thus causes the blade to travel in a path such as that shown in Fig. 9. The number of the up-anddown movements of the blad e-support caused by the eccentric 41 depends on the width of the grinding-stones and is determined by the circumstance that each point of the blade must once come into contact with the grinding-stone when in its highest position. The length of the arc movement can be modified as desired, to which end the eccentric parts are adjustable and movable on the shaft 25, Fig. 4. The whole bearing 45 of the bellcrank lever can be vertically adjusted by means of a screw 44 and hand-wheel 43, so that blades of various width can be ground.

The driving of the grinding-rolls is effected l by. means of belt-pulleys 4, supported in a double head-stock 3.- The bearings 9 of the spindles of the grinding-rolls are arranged in special guide-tubes. On a transverse bed 5 are arranged on the left and right hand side head-stocks 6, each provided with two bearings and supporting which are guided bearings 9 for the spindles of the grinding-rolls. The spindles are acted upon by the inner helical springs 8. These tubes are provided with covers 10, through which project screw-spindles 11, which effect the alteration of the force of the springs. Each screw is provided with a hand-wheel 12.

The following device allows of the accurate setting of the grinding-rolls 18 for various 3 shapes of blades, as well as adjustment to two tubes 7, in

compensate for the wear of the grinding rolls. In two supports 13, arranged on the tubes 9, carrying the spindles of the grinding-rolls, are mounted, by means of sleeves 14, a spindle 15, provided with a left and right hand screw-thread and moved by a hand-wheel 17, supported in the fork 16, Fig. 6. The bearings 9 of the grinding-roll spindles urged toward one another by the springs 8 can be moved. apart by turning the hand-wheel 17, the sleeves 14 causing the supports 13 to move laterally in the direction of the arrows, so that the grinding-rolls 18 can be set in an accurate manner. The bearings 9 of the grinding roll spindles, with the grinding-rolls, can be pulled out b means of two levers 19, pivoted to the said bearings 9 and operated, by means of rods 20, by a treadle-lever 23, pivoted on the pin 21 and sliding in the slot of a guide 22 for the purpose of-enabling the blades to be interchanged, the supports 13 sliding on the sleeves '14, the projections of which form a stop and prevent the springing back of the bearings.

What I claim as my invention, and desire to secure by Letters Patent, is

1. A razor-blade grinding-machine comprising a driving-shaft, an eccentric, means for operating said eccentric from said driving-shaft, a bell-crank lever having its fulcrum on said eccentric, a razor-blade carrier on one arm of said lever, means intermediate the other end of said lever and the drivingshaft for imparting a rocking motion to the razor-blade carrier and means for raising or lowering the position of said eccentric substantially as set forth.

2. In a razor-blade-grinding machine of the kind described a pair of grindingrolls, shafts carrying said rolls, tubular guides for said shafts and pivoted levers connected to 'said shafts and to a treadle device, substantially as set forth.

3. A razor-blade-grinding machine of the kind described comprising a driving-shaft, an eccentric, means fordriving said eccentric from said driving-shaft, a razor-carrier, a bell-crank lever supporting said carrier and fulcrumed in said eccentric, means for raisl ing or lowering the pivot of said bell-crank lever, an eccentric on said driving-shaft operating the free end of the bell-crank lever, and a pivoted lever carrying the supportingshaft of the grinding-roller and means for adjusting the grinding-rollers toward or from each other substantially as set forth.

4. In a razor-blade grinding-machine of the kind described, grinding-rolls mounted on shafts 9, tubular bearings for said shafts and springs and adjustable screws for regulating the position of the grinding-rolls, substantially as described.

| In testimony whereof I have signed my nameto this specification in the presence of two subscribing witnesses.

FRlEDRIOH WILHELM BLASBERG. Vitnesses:

I P. HERRMANN,

, VICTOR W. HELDT.

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