US1746593A - Device for pointing bristles of brushes - Google Patents

Description

Feb. 1, 1930. R IZAWA DEVICE FOR `POINlINGr BRISTLES OF BRUSHES Eiled March '7. 1928 NVENTOR; v?il'o/1iru BY:

/zawa Pr T T 0 NY Patented Feb. 11, 1930 PATENT orifice RIICHIRO IZAWA, OF KYOTO, JAPAN DEVICE FOR POINTING BIRIIS'JJLCES` OF BRUSHES Application filed March 7, 1923, Serial No. 259,634, and in Japan Ella-rch 19, 1927.

circumference and an abrading wheel having numerous needles project from the circumference. In this device, bristle holding members are fixed to the said carrying wheel in such a manneras each to rotate on its own j 1f axis. The said holding members are provided with several projections around them, and the frame has also projections at such position that they touch the projections ofthe bristle holding members. `t is also so devised that during the rotation of the bristle carrying wheel, each of the bristle holding members is slightly revolved whenever it passes the said projections of the frame, so that each time the bristles may expose fresh surfaces to the abrading wheel. The object of this invention is to abrade uniformly the thick bristles like those of paint brushes and `obtain uniformly-pointed bristles.`

Referring to the accompanyingl drawing,

Fig. 1 is a front elevation of the device of this invention;

Fig. 2 is a front elevation, partly in section of the bristle holding devices which constitute a part of the device shown in Fig. l;

Fig. 3 is a sectional side elevation of the same devices;

Fig. el is a plan of the same and Fig. 5 is a detail view, on an enlarged scale, of a portion of the abrading wheel, illustrat ing` the abrasive elements.

In the drawing, (1) is a bristle carrying wheel; and (2), an abrading wheel. The abrading wheel (2) may be of the construction shown and described in Letters Patent No. 1,627,704, issued to me under date of May 10, 1927, and which wheel carries a plurality of pins (3), to which abrading material like emery powder is adhered, planted around its rim and is mounted on the frame (4). The bristle carrying wheel (1) has around its rim several bristle holding members as will be eX- plained hereinafter. lt is slidably mounted on the frame (4) and can be brought close to or away from the abrading Wheel by means of a screwed shaft (5). As both the bristle carrying and abrading wheels are rotated by a suitable mechanism, the pins (3) penetrate into the bristles and abrade them when the two wheels approach each other.

rlhe bristle holding member (6) is pro- 55 vided with a hole (9), for inserting Qthe handle (8) of a brush (7) or a holder of the bristles temporarily bundled and with set screws (10) for clamping the said handle or holder. The exterior` of said member (6) is 60 cylindrical and has a continuous groove (11) 'and several projections (12) on the circum- Y ference. The supporting block (13) has a vcylindrical socket (il) at its upper portion to receive the said bristle holding` member (6), 65

and an opening (16) at its lower portion for the handle to be loosely inserted. The set screws in the said supporting block (13) project their heads into the groove (11) A number of recesses (17) are provided on the 70 circumference of the carrying wheel and the said supporting blocks (13) are loosely in serted into the respective recesses, and are pivoted by the pins (18) at the middle portion of both sides respectively to the walls of the 7 said recesses. (19) is a projection on the frame and situated so as to touch the proj ections (12) during the rotation of the carrying wheel (1).

The device of the present invention abrades and points the bristles planted on a brush handle as shown in (7) or temporarily bundled bristles for brushes in order to obtain soft and line bristles. The said bundles of bristles (7) are attached to the holding mem- 85 ber (6) and pointed by the needles (3) when both the carrying wheel (l) and the abrading wheel (2) are rotated. When each of the bundles of bristles (7) passes by the projection (19) on the frame during the rotation of the carrying wheel (1), the projections (12) of the bristle holding member touch the proj ection (19) in consequence of which the holding member (6) is slightly turned in the gr socket (lll). As each of the holding memo bers is somewhat turned every time it passes by the projection (19) during the rotation of the carrying wheel, the bundles of bristles turn fresh surfaces to the abrading wheel every time they come to the working position ,1

of the abrading Wheel, and therefore are point-ed in the dierent sides. As the bristles bend down under the pressure of the pins when worked by the abrading wheel, they are abraded slantwise even if attached in true radial relat-ion to the carrying wheel, I-Iowever, the supporting block (13) and the holding member (6) together with bristles attached thereto are capable oit rocking freely about the pivots (18) in the example shown in the accompanying drawing so that the bristles are inclined towards the direction of' their rotation by the action of the needles (3) of the abrading wheel and are abraded slantwise. If the directions of rotations of the abrading wheel and the carrying wheel are reversed, every bristle is inclined automatically in the opposite direction and will receive the pointing action of the abrading needles. In brushes with slender bristles such as paste-brushes, tooth brushes, etc., the bristles can be uniformly abraded and pointed by the abrading action given slantwise to their ends from one or both sides. However, if the bristles form thick layers such as those of paint brushes, it is very diiiicult to obtain uniformly-pointed bristles by the abrading action given from one or both sides. For instance, if abraded from two opposite directions, they will become irregular in length. Especially, when pressed by the abrading wheel, the bristles offer more resistance to bending at the central dense portion and consequently receive the act-ion of the abrading Wheel more than those at the outer thin layers. Thus, the end of a brush is apt to become concave. However, according to this invention, the bundle of bristles is slightly revolved every time it receives the action of the abrading pins and therefore is abraded from different directions, so that uniformly abraded and pointed bristles can be obtained.

Although Fig, l shows an example which comprises a pair of carrying wheel and an abrading wheel, the arrangement may be changed at will.

Claims V 1. A device for pointing bristles of brushes, consisting of an abrading wheel, a bristle carrying wheel, supporting blocks disposed radially and pivoted to the said carrying wheel so as to make rocking movements to and fro, cylindrical sockets provided in the said supporting blocks, brush holding` members rotatably inserted in the said sockets, radial projections provided on the circumferences of the said holding members, and a projection fixed to the frame in such a position that it touches the said radial projections ol the holding members during the rotation of the carrying wheel.

2. In a device for pointing bristles, the combination of a bristle-carrying wheel, a plurality of bristle-holding members mounted in the periphery of said carrying wheel and each rotatable around its own aXis and capable of rocking movement in the direction of rotation of the carrying wheel, radial projections carried by said bristle-holding members, and a fixed projection disposed in position to engage said radial projections during rotation of said carrying wheel thereby to rotate said bristle-holding members.

3. In a device for pointing bristles, the combination of a wheel having a plurality of radial openings extending inwardly from its periphery, a supporting block, pivoted in each of said openings for rocking movement in the direction of the circumference of the wheel, a brush-holder member mounted for rotation in each of said blocks, and means for automatically rotating said brush-holding members in a step-by-step movement dur ing rotation of said wheel.

RIICHIRO IZAIVA.

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