US2594646A - Polishing machine - Google Patents

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Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
  • B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
  • B24B21/12—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving a contact wheel or roller pressing the belt against the work
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
  • B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
  • B24B21/12—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving a contact wheel or roller pressing the belt against the work
  • B24B21/14—Contact wheels; Contact rollers; Belt supporting rolls

Definitions

• My invention relates to buning and polishing machines and particularly to automatic polishing machines.
• An object of my invention is to provide a polishing machine having a work wheel which is pressed against the inside surface of a polishing belt by a spring biased slide.
• Another object of my invention is to provide a polishing machine comprising a work wheel which is pressed against the inside surface of a polishing belt with a constant working pressure.
• Another object of my invention is to provide a polishing machine embodying a plurality of work wheels of different hardness and of different pressures against the belt.
• Figure 1 is a top plan view of a manual polishing machine comprising a single work wheel
• Fig. 2 is a front elevation of the parts shown in Fig. 1,
• Fig. 3 is a fragmentary vertical sectional view taken on the line 33 of Fig. 1,
• Fig. 4 is a view in side elevation of a polishing machine comprising three work wheels and an endless motor-driven belt for moving the work,
• Fig. 5 is a bottom plan view of the parts shown in Fig. l, and,
• Fig. 6 is a fragmentary sectional view through the three work wheels.
• a polishing machine I l which comprises a base plate
• Atathe other end of the supporting plate l3 I provide an idling pulley I! which is mounted on a vertical rotatable shaft 2
• a polishing or abrasive belt 21 is adapted to operate over the motor pulley 29 and over pulley l9.
• Thedegree of coarseness of the belt 21 may be any desired value or it may be of a kind adapted to the work to be done and to the material which is to be polished.
• which may be of the kindhereinbefore disclosed and claimed in my co-pending application #657,804 filed March 28, 1946, now abandoned, is mounted on a rotatable shaft 33, this rotatable shaft extended substantially parallel to the motor shaft and to shaft 2
• Bearing member 35 is supported on base plate l3 as by a pair of bolts 31.
• the bearing member 35 is moved as by a manually actuable screw-threaded shaft 39 which extends through a member 4
• Shaft 39 has its inner end abutting against a plate 45 which plate 45 is provided with two openings so that it may move on two guide shafts 41 and 49, these shafts being rigidly supported by a bracket member 5
• Springs 53 and 55 surround the guide shafts 4i and 49 respectively and extend from member 45 to bearing member 35 so as to permit of varying the pressure exerted by work wheel 3
• Fig. 1 of the drawings the position of work wheel 3 I, when the tension of the springs 53 and 55 has been reduced, thereby permitting the work wheel 3
• and belt 21 is relatively small when located as indicated by the broken line position and it is of course obvious that the turning movement of shaft 33 in a direction to compress springs 53 and 55 will move wheel 3
• comprising a motor 33 having a pulley 35, a pulley El mounted on a rotatable shaft 69, which rotatable shaft is supported in a bearing H, which bearing is supported on a plate I3 by a, plurality of bolts 15.
• the motor 63 may be secured in proper operative position on plate 13 by a plurality of bolts 11.
• I show three Work wheels 19, 8
• Each of these plates is adapted to slide on two guide shafts 89 and 9i which extend from a member 93 to a member 95 and are rigidly held in their proper operative positions.
• Springs 91 and 99 encircle the guide shafts 89 and 9
• and 83, in relation to the polishing belt, is similar to that for work wheel 3! of Fig. 1.
• An endless polishing or abrasive belt it! is adapted to run over pulleys 61 and 65 and the three work wheels 19, 8
• the left hand work wheel 79 is subjected to greater spring pressure than work wheel SI
• work wheel 8! is subjected to greater spring pressure than work wheel 83.
• the direction of movement of a piece of work N33 is from left to right as seen in Fig. l so that the degree of polishing will be such as to tend to remove the deeper scratches or marks first, as explained below.
• the work wheel 8! with its reduced pressure against the belt Hll, will then remove the relatively coarse surface finish produced by work wheel '59, and work wheel 83 will produce a, still finer finish on the surface of a piece of work.
• the type or kind of finish obtained depends on the depth of scratches produced by the abrasive belt and that the depth of the scratches depends not only on the grade or fineness of the grit employed, but also upon the amount of mechanical pressure with which such grits are forced into contact with the piece of work being polished.
• the degree of polishing finish can thus be regulated.
• FIG. 4 I have shown in Fig. 4 an endless work conveyor belt I95, the upper reach or span of which travels from left to right over two pulleys l0! and I09. Platforms Ill and H3 are provided, one at the left hand end of base T3 and the other at the right hand end of base 73, for reception and discharge respectively of the individual pieces of work to be polished.
• work wheel 79 may be so designed and constructed that it will be relatively hard.
• may be so constructed that it will be of medium hardness, and work wheel 83 may be so constructed that it will be of minimum hardness, or soft.
• a spring-biased floating mounting for a work wheel insures that the mechanical pressure between the part or work to be polished and an abrasive or polishing belt is approximately constant and when employed in a non-automatic machine is independent of manipulation of a piece of work by the operator.
• work wheels having relatively soft and resilient composition permits of yielding of the work wheel to the pressure of the work, permitting curved or irregular shaped surfaces of the work piece to sink into the body of the work wheel causing a pliable abrasive belt to envelope the surface of the work and closely hug the contour of the piece being polished.
• the operator need only start in with light tension or pressure of the abrasive belt and tryout the pressure, increasing it in case it is not enough. He can do no damage to the work with too little pressure but will only have to repeat, with slightly increased pressure, his polishing of the work. After he has once determined the proper amount of pressure to be exerted by the kind of work wheel he has in his machine he can then continue and will obtain substantially the same results until wearing out of the abrasive belt occurs.
• the work wheel thus floats under substantially constant pressure against the abrasive belt and to obtain the same kind of finish during successive operations it is necessary only for the operator to exert suflicient pressure on the work piece to make the work wheel float. Slight inadvertent movements of the polishers arms and hands during the actual polishing operation are thus unimportant as the chances of exerting too much pressure with the resulting deep scratches are entirely eliminated.
• the piece of work I03 is first brought into pressure contact with the abrading surface of the belt just ahead of and below work wheel 79 and since work wheel 79 engages belt iill with the greatest mechanical pressure the deeper die marks or surface scratches are removed first. After that it again makes contact with the abrasive belt at the second work wheel 81 where a slightly finer polishing finish is obtained because of the smaller pressure exerted by the work wheel on the part being polished. A still finer and final polishing is imparted to the work by work wheel 83 because of the fact that the spring tension on work wheel 83 is much less than that on the preceding work wheels.
• the individual work wheels may also be made of diiferent degrees of hardness, the first one being hard, the second being medium hard, and the third may be extremely soft.
• a combination of wheels of various hardnesses and different spring pressures also results in difierent types of finishes.
• abrasive belts may be used.
• a first abrasive may be very coarse, or a belt having a finer grade of abrasive may be used, or a still finer grade of abrasive may be used.
• An automatic polishing machine comprising in combination, an endless polishing belt, a plurality of belt-backing work wheels supported in contact with the inside surface of said belt, each said wheel being separately movable toward and away from the belt, means for moving a piece of work along said belt past each of said work wheels in succession, and biasing means for pressing said work wheels against said inside surface of said belt, said means being adjusted to urge each said work wheel against said belt with a greater force than the work wheel succeeding it in the direction of travel of a work piece.
• each said work wheel is harder than the one succeeding it in said direction of travel of a work piece.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Description

Priority Applications (1)

Applications Claiming Priority (1)

Publications (1)

Family

ID=24865510

Family Applications (1)

Country Status (1)

Cited By (4)

Citations (18)

• 1946
  • 1946-11-30 US US713277A patent/US2594646A/en not_active Expired - Lifetime

Patent Citations (18)

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