US1115298A - Pencil-sharpening-machine. - Google Patents

Description

S. FORRESTER, DECD.

1:. a. roluzns rmz, ADMINISTRATOR. PENCIL SHAP.PENING MACHINE. APPLICATION FILED JULY 23, 1908.

Patented Oct. 27, 1914.

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s. FORRESTER, DEG D.

E. G. PORRESTER, ADMINISTRATOR.

PENCIL SHAR PENING MACHINE.

APPLICATION TILED JULY 23, 1908 Patented Oct. 27, 1914.

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PENCIL SHARPENING MACHINE.

APPLICATION FILED JULY 23, 190B.

Patented 0013.27, 1914.

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S. FORRBSTER, DEGD.

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PENCIL SHARPENING- MACHINE.

1, 1 1 5,298. APPLICATION FILED JULY 23, 1908. Patented Oct. 27,

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S. FORRBSTER, DEGD.

1;. G. ronns'rsn, ADMINISTRATOR.

PENCIL SHARPENING MACHINE.

APPLICATION FILED JULY 23, 190B.

Patented Oct. 27, 1914.

5 SHEETS-SHEET 5.

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SAMUEL FORRESTER, OF PITTSBURGH, PENNSYLVANIA; ERNEST G. FORRESTER ADMINISTRATOR OF SAID SAMUEL FORRESTER, DECEASED.

PENCIL-SHARPENING- MACHINE.

To all whom it may concern Be it known that I, SAMUEL Fonnesrnn, of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Pencil-Sharpening Machine, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a front elevation of a pencilsharpening machine embodying my invention; Fig. 2 is an end elevation; Fig. 8 1s a plan view; Fig. 4: is a sectional elevation showing the grinding wheel, the pencilholding chuck, the clutch-shifting connection and a portion of the gearing; Fig. 5 is a detail view showing the pencil-holding chuck and pencil stop in elevation; Fig. 6 is a plan view partly in section, showing the manner in which the pencil-holding chuck, the pencil stop and the gage are adjusted; Figs. 7 and 8 are detail views of the pencilholding chuck; and Fig. 9 is a detail view of the clutch-shifting connections.

My invention has relation to pencilsharpening machines and is designed to provide a machine of this character by means of which pencils may be rapidly and accurately sharpened, and which will be simple in its construction and operation.

My invention has more particular relation to novel means or chucks for holding the pencil while it is being sharpened, and for releasing the same after the sharpening operation is completed; to the means for driving and operating the chuck; to the novel means for driving the machine, and to various other novel features of construction and arrangement, hereinafter described.

The precise nature of my invention will be best understood by reference to the drawings, in which I have shown a preferred embodiment of my invention, it being premised, however, that various changes may be made in the details of construction and arrangement, without departing from the spirit and scope of my invention, as defined in the appended claims.

In these drawings. the numeral 2 designates a supporting frame of any suitable character and which carries the horizontal table 3.

4 is the grinding or sharpening wheel which is provided with an abrasive surface 5 of suitable character on its front face, the l Specification of Letters Patent.

Patented ea. at, 1914..

Serial No. 444,919.

plate or disk 4 which carries this abrasive surface being clamped between plates 6, secured to a shaft 7, which is 'journaled in suitable bearings 8 on the upper surface of the table 3. Thewheel 4 turns in a vertical slot or opening 9 in the table, as shown in F gs. 3 and 4, the shaft 7 being preferably capable of an endwise adjustment in its bearings and secured in proper adjustment by means of the adjustable thrust screw 10, seated in a bearing 11.

12 designates a chuck carrier consisting of a slotted two-part frame lying in an oblique plane and held together by a suitable screw or bolt 12*, and having a downwardly eX- tending vertical sleeve portion 18, whichis fixed to a pin or shaft 14, supported to turn in a bearing sleeve 15, and which projects upwardly through said sleeve and through a slot in the table 3 from a plate 14 secured to the table.

Journaled in the chuck carrier 12 to rotate in the slot thereof is a groove belt wheel or pulley 16, said wheel having laterally 6X- tending hub portions which form bearings in the carrier.

17 is a chuck sleeve having one end portion thereof slitted to form a series of spring jaws 18, the pencil to be sharpened being inserted endwise through the sleeve 17 and being clamped by these jaws 18 in the manner best shown in Fig. 4. For the purpose of opening and closing the jaws 18 to grip and release the pencil, a sliding sleeve 19 is provided, whose inner end portion has a bearing against the inclined or cam surfaces 20 on the jaws 18, so that as the sleeve 19 is moved endwise in one direction, it will compress the jaws against the pencil and when moved endwise in the other direction, will release said jaws. This sleeve 19 is formed with longitudinal slots 21, through which extend pins or screws 22, seated in one of the hubs of the wheel 16, and which extend into the clutch sleeve 17. These screws cause the clutch sleeve and the clutch-actuating sleeve to rotate with the wheel 16, while the slots 21 permit of the longitudinal opening and closing movements of the sleeve 19. The sleeve 19 is actuated by the pivoted lever 28, having a forked end portion 24, which embraces the outer end portion of the sleeve 19 and works against the head or collar 19 thereof.

25 is a cooperating fixed lever arm between which and the movable lever 23 is therefore, necessary to first actuate the lever 23, forcing back the sleeve 19, to open the jaws 18. The pencil can then be inserted into the chuck and as soon as the lever 23 is released, the jaws 18 immediately grip and hold the pencil by the action of the coiled spring 27 on the sleeve 19.

In order to stop the pencil and hold it in proper position, I provide a stop 30, which is adjustably secured to the table by a screw 31, best shown in Fig. 6, and which has an inclined and concave stop face32. The concave face 32 is struck from a radius drawn from a point in the vertical axis of the pin or shaft 14, so that notwithstanding variations in the position of the clutch carrier, the penoil by the engagement of its point with any portion of this curved surface will be stopped in the same position. The clutch sleeve 17 has no endwise movement, so that in closing it does not move the pencil from its stopped position. For the purpose of determining approximately the proper position of the chuck carrier to receive a pencil, the table 3 may be provided with an indi cating mark 33 (see Fig. 3). When the chuck carrier is in such position that the lever 25 is approximately over this mark 33, a pencil, if inserted into the chuck, will come in contact with the stop face 32.

The swinging movement of the chuck carrier on the shaft of post 14, is limited in its forward direction by the adjustable stop 34, and in its opposite direction by the stop 35. 36 is a gage for limiting the action of the grinding wheel upon the pencil, to prevent the cutting of shoulders in the pencil by too deep grinding. This gage consists of a pin which is adjustably secured at 37 in a bracket 38, secured to the table 3, the pin being so adjusted relatively to the abrasive surface 5, as to be engaged by the shank of the pencil after it has been sufficiently ground and thus prevent the pencil from being pressed further against the abrasive surface.

ing the lower portion of the grinding wheel and having an additional dust catcher 42, above the table 3, to catch and guide the dust and chips from the pencils being ground downwardly into the catcher 41.

The wheel 16 is rotated to rotate the pencil by means of a cord belt 43, passing around it and around the idler and guide pulleys 44 and 45, and also around a driving 1 ulley 46, the pulley 46 being driven in the manner hereinafter described.

The machine is constantly driven and inasmuch as the wheel 16 should be rotated only during the grinding operation, a clutch mechanism controlled by the movement of the chuck carrier 12 is provided. To this end, the driving pulley 46 is loosely mounted on the shaft 47 and is designed to be moved endwise thereon. Secured to said wheel 46 is a clutch arm 48, which is designed to be engaged by the pin or stop 49 of a gear wheel 50, which is fixed to the shaft 47. The wheel 46 has a flanged hub 51, which is en-- gaged by the forked arm of a shifting lever 52, p'voted to the frame at 53, and having its other arm connected by a connecting rod 54 with a crank arm 55 on the lower end of the post 14, to which the sleeve 13 of the chuck carrier is secured, as above described. By means of these connections, when the chuck carrier is moved to bring a pencil into position to be sharpened, the wheel 46 is slid endwise on the shaft 47 in a position to cause the engagement of the pin or stud 49 with the arm 48; and when the huck carrier is swung in the opposite direction after the sharpening operation has been completed, the wheel 46 is moved back on the shaft 47 to disengage its arm 48 from the pin 49. In order to prevent the shock of a sudden driving engagement with the constantly driven gear wheel 50, the arm 48 is preferably a flexible or spring arm. The pin 49 is also carried by a spring 49 so that if it should happen in shifting the clutch that the arm 48 should strike the end of the pin 49, the latter would yield by reason of this spring.

The gear wheel 50 drives the shaft 7, which carries the grinding or sharpening wheel by its engagement with the teeth of a pinion 56 on said shaft. The shaft 47 may be driven in any suitable manner in the case of a power-operated machine. machine shown in the drawing is designed to be operated by a pedal movement and in order to secure greater power and a steadier driving action, I have devised a double-acting pedal movement, now to be described.

57 designates apedal plate which is fulcrumed'on a rod 58, at the base of-the frame 2. This plate has an arm 59, connected by a connecting rod 60 with the crank pin 61 of a crank wheel 62, mounted on a shaft 63,

.and secured to this crank wheel is a gear- The wheel 64: whose teeth mesh with the teeth of a pinion 65 on the shaft 47, before described. 66 is a second pedal plate, also fulcrumed on the rod 58, and having an arm 67 which is connected by a connecting rod 68 with a rocker shaft 69, journaled in the table 3. (See Figs. 1 and 2). Connecting this rocker shaft with a laterally extending arm 70 of the pedal plate 57 is a second connecting rod 71. By reason of these two pedal plates and the connections described, it will be seen that the operator may emplov both feet in running the machine, the movement of the pedal plate '66 being transmitted to the pedal plate 57, through the connecting rods 68 and 71, and the rocker shaft 69. This arrangement gives greater power and also enables the machine to be run more speedily and uniformly, since one or the other of the two pedals is at all times in action. Both pedals being at the front of the machine, are in a position to receive the full power of the operator.

The machine above described is, as will be seen, extremely simple in its construction and mode of operation and enables pencils to be rapidly and accuratelylsharpened, the provision of the pencil stop and gage insuring the uniform grinding of each pen cil. By adjusting the plate 14 which carries the front and back stops 34: and 35, which limit the movement of the chuck carrier and which also carries the stem 15, the length of the point to be given a pencil can be regulated as desired. When said plate 14 is moved backwardly or to the right, looking at Fig. 6, the length of the point will be increased, while the reverse adjustment will cause a shorter point to be given the pencil. I

The arrangement of the wheel or pulley 16 is such that as the chuck carrier is swung forward and backward, the length of the driving belt or cord 13 is not substantially changed. The provision of the clutch mechanism whereby the wheel 16 is thrown out of operation as soon as the sharpening is completed, by the swinging movement of the chuck carrier, and is again put into opera tion as soon as a new pencil has been inserted and the chuck carrier moved back against the wheel, enables the rotation to be limited to the period during which the pencil is being sharpened, the chuck being stationary when the pencil is inserted and removed, although the machine is run constantly to keep up the speed of the grinding wheel.

The operator by movement of the lever 25 regulates the rapidity of the grinding action, but by the provision of the gage 36, he is forced to stop the grinding operation at the proper time. As soon as the grinding operation is completed, the lever 25 is turned until the lug 13 strikes against stop 35, the lever 23 is then pressed and releases the chuck, and the pencil slides by its own gravity down the inclined slideway 39, and into the pocket or receptacle 10. The lever 25 is then drawn around until it comes in line with the guide line 33 on the top of the table, the lever 23 being still pressed down and the chuck being open. Another pencil is placed in the end of the chuck and slides down by its own gravity until the point comes against the concave stop face The lever 23 is then released and the chuck grasps the pencil. The lever 25 is then drawn around until the pencil comes in contact with the grinding wheel, which is kept in motion constantly, the pencil begins to turn as the point leaves the concave face 32 of the stop 30, and stops turning at the same place on the reverse action.

It will be obvious that many changes may be made in the details of construction and arrangement of the parts without departing from my invention. Thus, any suitable driving mechanism may be employed for rotating the grinding wheel and for rotating the pencil chuck; any suitable grinding wheel may be employed; the pencil stop and gage may be differently constructed, and the frame and table construction can be changed as desired.

I claim:

1. In a pencil sharpener,.a rotary cutter, a chuck carrier, a rotary chuck comprising a pulley having a hollow shaft mounted in the chuck carrier, means for preventing endwise movement of said pulley, a hollow gripping device for the pencil rotatably secured to the hollow shaft, wedge members on said gripping device, a reciprocating spring pressed sleeve within the hollow shaft of the pulley and surrounding the gripping device and arranged to engage the wedge members on the gripping device to close said device on the pencil, and mechanism for moving the sleeve against the action of the spring, substantially as described.

2. In a pencil sharpening machine, the combination of a rotary grinding or sharpening wheel, of a pivoted swinging chuck carrier, a chuck journaled obliquely in said carrier, the chuck carrier being arranged to be swung on its pivotal connection, means for actuating the chuck to grip and release the pencil, driving means for rotating the sharpening wheel, means for rotating the chuck, and means for throwing the chuck driving means into and out of operation by the movement of the carrier; substantially as described.

3. In a pencil-sharpening machine, the combination with a pivoted swinging chuck carrier having a pencil-holding chuck therein, of a driving shaft, driving connections between said shaft and the chuck, said connections including a clutch, and means controlled by the movement of said carrier for throwing said clutch into and out of operation, substantially as described.

4. In .a pencil-sharpening machine, the combination with a pivoted swinging chuck carrier and a pencihholding chuck carried thereby, of driving means for rotating the chuck, said means including a clutch having a yielding element, and means controlled by the movement of the carrier for shifting the clutch, substantially as described.

5. In a pencil sharpening machine, a grinding wheel, a pencil-receiving receptacle adjacent to the grinding wheel, a pivoted chuck carrier mounted between the wheel and the receptacle, a pencil-retaining chuck mounted in said carrier, means for swinging the chuck into alinement with the receptacle, and means for opening the chuck to permit the pencil to fall into the receptacle; substantially as described. 6. In a pencil-sharpening machine, a cutter, the combination with a pivoted chuck carrier having a pencil-holding chuck therein, of a pencil stop, and a pencil slideway adjacent to said stop to receive the pencil from the chuck when said chuck swings away from the cutter, substantially as described.

7. In a pencil-sharpening machine, the combination with a constantly rotating grinding or sharpening wheel, of a pivoted swinging chuck carrier, a pencil-holding Copies of this patent may be obtained for five cents each, by addressing Washington, I). G.

tween the hollow shaft and the gripping device to close said gripping device, and screws securing the gripping device to the hollow shaft, said screws passing through slots in the sleeve; substantially as described.

9. In a pencil sharpener, a rotary cutter, pivot-ed chuck carrier, a rotary chuck comprising a pulley having a hollow shaft mounted in the chuck carrier, a hollow spring gripping device for the pencil secured to the shaft, a reciprocating spring pressed sleeve between the hollow shaft and the gripping device to close said gripping device and a positive drivingconnection between the hollow shaft and the gripping device; substantially as described.

In testimony whereof, I have hereunto set my hand.

SAMUEL FORRESTER.

Witnesses:

GEO. I-I. PARMELEE, II. M. GoRwIN.

the Commissioner of Patents,

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