US1170093A - Pencil-sharpening machine. - Google Patents

Description

L. MYERS.

Patented Feb. 1, 1916.

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PENCIL SHARPENING MACHINE.

APPLICATION FILED DEC. 22, 1913'.

Patented Feb. 1, 1916.

2 SHEETS-SHEET 2 wm. e.

' LOUIS'MYERS," OF BROOKLYN, NEW YORK, ASSIGNOR TO THE TRAUT & HINE MANU- FACTURING COMPANY, F NEW BRITAIN, CONNECTICUT, A CORPORATIQN 0F CONNECTICUT.

Specification of Letters Patent.

PENCIL-SHARPENING MACHINE.

Patented Feb. 1, 1916.

To all whom t may concern:

Be it known that I, Louis MYERS, a citizen of the United States, residing at Brooklyn, Kings county, New York, have invented certain new and useful Improvements in Pencil-Sharpening Machines, of which the following is a full, clear, and exact description.

This invention relates to machines for sharpening pencils, and has for its obj ect improvements in the construction of the same for cutting an improved point upon a pencil, and for the promotion of genera] efiiciency in operation.

With this object in view 1 have devised a machine, several practical embodiments of which are disclosed in the accompanying drawings, in which- Figure 1 is a vertical section of the entire machine taken through line 1 1 of Fig. 2;

.-Fig. 2 is a plan of the machine; Fig. 3 is a horizontal cross-section of the machine through line 8 3 ofFig. 1; Fig. 4: is a horizontal cross-section of the pencil-holding means through line 4 4 of Fig. 1; Fig. 5 is a vertical section of the supporting stand ard of the machine through line 5 5 of Fig.

'2; Fig. 6 is a transverse section of the pencil-holding and guiding means through line 6 6 of Fig. 4; Fig. 7 is a horizontal section of the cutters through line 10 1O of Fig. 1.

Referring more particularly to the drawings, the main frame consists of a vertical hollow standard 1, base 2, and upper table 18. Projecting laterally from the frame 1s an arm 8, which, together with the upper table 1.8, forms bearings for a revolving milling device hereinafter more particularly described. v

The pencil indicated at P is guided and preferably held by clamping means firmly against rotation'. Slidably mounted in the hollow standard 1 of the frame is a post 22 (see Fig. 5) supporting at its upper end a horizontal plate 21. This plate has acentral orifice through which the pencil is adapted to extend, and at each side of this orifice is mounted a sliding clamping jaw 31 for gripping the pencil. (SeeFig. 1). These jaws are moved for gripping and releasing the pencil by means of a pin and slot connection with a slidable operating member 27. 1t will be noted that the slots 29 in the operating member 27 are diagonally arranged with respect to the clamping jaws 31 so as to act as a cam upon the pins 80 of said jaws, when the member 27 is moved back and forth. The operating member 27 is provided with a thumb-piece 28 projecting laterally through the side of the plate 21 to be engaged by the linger of the operator. A spring 32 (see Fig. 1) is connected with the plate 27 to normally hold it in position for closing the clamping jaws 31.

Referring more particularly to Figs. 4 and 5, it will be seen that the rear end of the operating member 27 is provided with a slotted orifice with beveled walls 27. EX- tending through this orifice is rod 24: having an upper beveled head 25 for coperative engagement with the beveled walls 275. The rod 24 extends out through the end of post 22 and is provided with a cap nut 26 thereon located within the chamber of the hollow standard 1. The post 22 is provided at one side with a toothed rack 23 (Fig. 1) which is adapted to engage a pinion 19, loosely mounted on the main operating shaft 6 of the machine. The operating shaft 6 as shown has fixed thereto at one end the usual handle 7, and at the other end a bevel gear 5.' A spring-pressed pawl 20 is carried on the bevel gear 5 for engaging the teeth of pinion 19. When the shaft 6 is rotated in its right-hand direction, the pawl 20 rides idly ovei` the pinion 19 without operating the same, but when the handle 7 is reversed pinion 19 is carried therewith and by its engagement with rack 23 elevates the plate 21. When plate 21 has beenelevated far enough to bring nut 26 against shoulder of standard 1 (see Fig. 5), the further elevation of plate 21 causes a coaction between the beveled head 25 and beveled walls 27, so that plate 27 yis moved against its spring to open the jaws 31. A pencil may then be inserted through the opening of the plate and extended through a central opening 18 of table 18 into the milling device as shown in Fig. 1. As soon as handle 7 is slightly released, the jaws 31 `will spring back in position and clamp the pencil tightly. Thepencil is now ready to be sharpened by the operation of the milling device, which will now be described.

Referring first to Fig. 1, the carrier 3' is revolubly mounted between table 18 and arm 8 with its upper hollow hub 9 `in a vided with a bevel gear L meshing with the operating bevel gear 5. Mounted on the carrier for independent rotation thereon are one or more milling cutters 11 with their axes disposed atan Vangle to the axis of rotation of the carrier 3 and of the pencil axis I. These milling cutters have bevel gears 1G meshing with a circular rack 17 fixed upon the upper-table 18, whereby when the milling cutters are carried about the pencil by the revolving movement of carrier 3, they 'are given independent rotation by the engagement of their bevel gears 16 with the stationary rack 17. It will be noted that the pencil is held within the hollow hub 9 of the carrier 3 so that its longitudinal axis is Asubstantially coincident with the axis of said revolving carrier. The milling cutters 11 in the present modification are partly cylindrical and partly tapered like the frustum of a cone and have peripheral cutting teeth spirallyl arranged thereon for acting upon the pencil. Each milling cutter has its milling surface arranged at one portion at a different angle relative to its axis than at another portion. whereby two different angles of cut will be obtained `upon the pencil. F or instance in Fig. 1 the milling surface of cutter l1 is substantially parallel to its axis to the point 1-2, but the lower portion 13 of the milling surface is inclined or tapered. It will be observed that by this construction the pencil is cut toward the point C with a smaller angle relative to the pencil axis than at the body of the pencil C. The advantage of this construction is that the pencil is cut with much more of the lead exposed for giving a longer point. Also by, reason of the closer proximity and slightly slower movement of the milling cutting teeth on the lead of the pencil than on the body of the pencil, the lead'is less Vliable to be broken than formerly.

Inl order. to provide an -adjustable stop which shall engage the pencil point and limit its longitudinal movement toward the remote end of the carrier and the cutting devices at various positions according to the nature of the point desired. I provide a sliding pin 5l passing through the lower bearing 10 and the lower end of the carrier so 'thatits'upper end lies in the path of the pencil point. To the lower end of thepin I afiix a lever 52 which is pivoted at 53 to the arm 8. The free end of the lever 52 is provided with an indicator 54 which moves over a scale on the `standard and having the marks F. M. C. 0. When the indicator is opposite thev letters F, M. C or U the point madev willbe fine, medium, coarse or crayon respectively. In order to hold the lever in adjusted position, I provide a projection 55 therein and correspondtering and discharging them so that they can be easily collected in a proper receptacle, I provide a sheath or shell 57 open at its lower end and secured to the carrier by screws 58 and surrounding the cutters so as to revolve with the carrier and the cutters. I preferably make this sheath or shell transparent so that the action of the cutters can be seen.

Subject matter sho-wn but not claimed herein is claimed in applicants co-pending applications, Serial Nos. 13,161, 13.162 and 13,163, filed on March 9th, 1915, as divisions hereof.

It is understoodthat the present drawings and foregoing description show only specified modifications of the invention and that other forms and modifications are included in the spirit and scope of the invention as defined in the appended claims.

What I claim is 1. In a pencil sharpening machine, a main frame, a pencil guiding means, a milling device comprising a revolving carrier, a milling cutter revolubly mounted in said carrier, said milling cutter having a tapering surface whose smaller end is in proximity to the point of the pencil when sharpened, and having a milling surface at an angle thereto and removed from the point of the pencil, said tapering surface continuously approaching the axis of revolution of said carrier as said smaller end is approached, and means for giving said milling cutter a relative planetary movement about said pencil.

2. In a pencil sharpening machine, a main frame, a pencil. guiding means, a milling device comprising a revolving carrier, a plurality of milling cutters mounted in said carrier, said milling cutters having tapering surfaces whose smaller ends are in proximity to the point of the pencil and other milling surfaces at an angle thereto and removed from the point ,of the pencil, said tapering surfaces continuously approaching the axis of revolution of said carrier as said smaller ends are approached, and means forgiving said milling cutters a relative planetary movement about said pencil, comprising a gear fixed on said frame, ccacting gears fixed to said milling cutters, and means for revolving said carrier relatively to said frame.

3. In a pencil sharpeneing machine, a

main frame, a pencil guiding means, a millcarrier, said milling cutters having tapering surfaces whose smaller ends are in proximity to the point of the pencil, and cylindrical milling surfaces removed from the point of the pencil, and means for giving said milling cutters a Yrelative planetary movement about said pencil, said tapering surfaces continuously approaching the axis of revolution of said carrier as said smaller ends are approached, comprising a gear xed on said frame, coacting gears fixed to said milling cutters, and means for revolving said carrier relatively to said frame.

al. In a pencil Sharpener, the combination of a support, a planetary cutter having a ro tating cutting member and a frame for carrying the same, of a bearing carried by said support for the remote end of the carrier, an adjustable pin having its axis parallel to the axis of rotation. of said frame and passing through said bearing for controlling the longitudinal movement of the pencil, said frame being rotatable relatively to said 1n. p 5. In a pencil Sharpener, the combination of a support, a planetary cutter having a rotating cutting member and a frame for carrying the same, of a bearing carried by vsaid support and engaging said pin.

6. In a pencil Sharpener, the combination of a support, a planetary cutter having a rota-ting cutting member and a frame for carrying the same, of a bearing carried by said support for the remote end of the carrier, an adjustable pin having its axis parallel to the axis of rotation of said frame and passing through said bearing for controlling the longitudinal movement of the pencil, and an adjusting member carried by said support and engaging said pin, said member engagingl said support so as to be held thereby in adjusted position.

LOUIS MYERS. l/Vitnesses:

H. B. BROWNELL, E. E. MORSE.

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