US2846005A - Trimmer or paper cutter - Google Patents

Description

United States Patent- O TRIMMER R PAPER CU'ITER Joe Biggs wilson, Texarkana, Ark. Application December 18, 1953, Serial No. 398,921 1 Claim. (Cl. 164-76) This invention relates to paper trimmers of the kind -in which paper is positioned Von the baseboard of the trimmer so that the line along which it is to be severed lies along one edge of the baseboard with which a cutting instrument is adapted to cooperate.

Paper trimmers of the kind to which this invention relates generally consist of a baseboard having inscribed on its upper surface a gridwork which assists in aligning paper which is to be cut in the trimmer with one cutting edge of thebaseboard on which it is customary to providea metal corner. In the past, most trimmers of this kind haveemployed a hand-operated cutting instrument which cooperates with the cutting edge of the baseboard to shear the paper along a line corresponding to the cutting edge of the board. It is known that trimming instruments of this kind are difficult to use eliciently when working with large sheets ofpaper, such as blueprints, large photostats, and other similar engineering prints andrdrawings.` This-is due mainly to the fact that the paper to be cut cannot be accurately maintained in position in the-trimmer while the operator manually actuates the cutting element. Y

The purpose of this invention-is to provide a new and improved paper trimmer of the kind in which the cutting element is moved automatically along the cooperatingcutting edge of the baseboard to cut the paper positioned in the trimmer and `then Yreturn to its starting position. n

Afurther object of thev invention is to provide a power-operated trimmer of this kind which is so constructed `that the cutting implement is maintained lin constant close engagement with the cutting edge of the baseboard and at a normal angle to the plane of the cutting edge on which the paper being cut is supported.

A further object of the invention is to provide a motor driven trimmer of this kind in which there is associated with the drive for the cutting implement a positive drive of the support means for the cutting implement along the cooperating cutting edge of the baseboard.

Another object of the invention is to provide means for supporting the carriage of the power driven cutting element in a simple but steady and reliable manner which after long usage will not become loosened to the extent that the cutting instrument is thrown out of its proper relationship with the cutting edge of the baseboard.

Further objects and the advantages of the invention will be apparent from the form of the invention illustrated in the drawings and the following detailed description thereof. It will be understood, however, that the specific illustration and description of the invention is solely for the purpose of facilitating an understanding, and not to be construed as limiting the invention, except as specified in the appended claim.

In the drawings,

Fig. 1 is a front elevational view of a trimmer in accordance with my invention;

Fig. 2 is a vertical sectional view on the line 2--2 of Fig. 1;

2,846,005 Patented Aug. 5, 1958 Fig. 3 is a rear elevational view of the trimmer shown in Fig. 2; and

. Fig. 4 is a diagram of a suitable motor control circuit for my invention.

Referring to the drawings it may be seen that a trimmer according to my invention comprises a baseboard 10 which is generally rectangular and on one of the lateral edges of which there is provided a metal cutting edge 12 which is L-shaped in cross section, one of its legs 14 being recessed into the baseboard 12 so that the horizontal surface of the leg lies ush with the surface of the baseboard. (See Figure 2.) Along each of the side edges of the baseboard 10, adjacent the end on which the cutting edge 12 is affixed, there are provided upright members 16, 18, on the upper ends of which is fixedly supported a transom in the shape of channel bar 20.

As may be seen from-Figure 1, the channel bar 20 extends transversely of the baseboard 10 parallel to the cutting edge 12. The channel bar 20 serves as a track on which the carriage, generally indicated as 22, is supported for movement transversely of the baseboard 10. The carriage 22 supports the cutting blade 24 which is positioned to cooperate with the cutting edge 12 in shearing paper or other material which is placed in the trimmer. As previously indicated, the carriage 22 is power driven and'when actuated will move from its initial position shown in Figure l transversely across the baseboard 10. The cutting blade 24 is provided with positive drive means so arranged that the passage of the carriage in this manner causes the .cutting blade to spin as it is drawn along the cutting edge 12 to effect the -shearing of the paper or other material inserted in the trimmer.

As may be seen best from Figure 2, the carriage 22 comprises `two spaced-apart, vertical plates 30, 32, which are secured in that relationship by means of four bolts 36 which carry spacing sleeves 40, 41 between the plates 30, 32. The spacing between the plates 30, 32, is such that the channel bar 20 may be received therebetween in a snug, but sliding engagement. The sleeve 40 supports the rollers 42, 44 which rest upon the upper horizontal surface of the channel bar 20. These rollers or bearings 42, 44 support the weight of the carriage 22, on the channel bar 20, so that there is a minimum of frictional resistance to the movement of the carriage 22 along the vchannel bar 20. Also supported on the carriage 22 is the motor 46 which provides the drive to move the carriage and also the drive for turning the cutting element 24 which is maintained in close engagement with the cutting edge 12 as the carriage progresses transversely of the baseboard. A worm gear 48 is supported on the drive shaft of the motor and this engages a pinion 50 which is secured to the shaft 54. The shaft 54 is journalled in the carriage andon the portion of the shaft 54 between the plates 30, 32 there is supported a pinion 62 which is secured to the shaft by a set pin in the integral hub 64. The pinion 62 engages a rack 66 which is provided or formed on the bottom of the lower horizontal leg of the channel bar 20. It will be seen, therefore, that when the worm gear 48 is driven by the motor, the drive will be transmitted through the shaft 54 to the pinion 62. As the channel bar carrying the rack 66 is stationary, and the carriage is freely mounted thereon, rotation of the pinion 62 will result in the drive throughl the pinion 62l which imparts move ment to the carriage along the channel bar 20.

Referring to Figure l it may be seen that the channel bar at each` end is provided with end plates 90, 92, respectively, which are fixed within the channel. pivotboltsk 94, 96fextend through apertures in the plates 90, 92, respectively, and through aligned apertures in the uprights 161, 18, respectively, so thatv the channel bar,

and the carriage 22 supported thereon maybe swung about the bolts 94, 96. In order to maintain the cutting blade 24 snugly against the cutting' edge 12, depending arms 98, 100 are iixed tothe/'channel barat either end, and' the lower portions of these arms are xed' to and drawn rearwardly by springs 1-02, 104, respectively, which are fixed at their other ends tothe bolts 106, 108, carried by the uprights 16, 18, respectively.

Referring to Figures 2' and 3 it may be seen that in this construction the motor 46' is supported on the horizontal llangel of a bracket 110 which is fixed to the outer face of the plate 32, and that the drive shaft of the motor extends through anV aperture in this ange. The end of the drive shaft carriesv the worm 48 which ispositioned to drive the pinion 50.

A motor reversing switch 112, and an off-on switch 114 are supported on the plate 30 in position that they may engage the trip bolts 116, 118, and 120, 122, respectively, xed at either end of the channel bar 20 when the carriage approaches the limit of its travel towards the respective ends ofthe channel bar.

A suitable control circuit for controlling the excursions of the carriage is vshown in Figure 4. The arrangement is such that the carriage traverses the baseboard in one direction and automatically stops. Actuation of remote control switch 124- will thereafter cause the carriage to traverse the baseboard in the opposite direction. The remote control switch may be mounted on the board at a convenient position or may be fixed to the end of an extension cord that may be carried in the hand of the operator,

The ott-on switch 114 is normally biased closed and the switch 112 in position to carry current to the motor in one direction. When the carriage is at its right-hand limit of movement the trip bolt 122 holds the switch 114 open and no current is supplied to the driving motor. Upon closing the remote control switch 124, current is supplied to the motor around switch 1'14 and the carriage is driven away from the trip bolt 122. The switch 114 then closes and the remote control switch may then be released. The carriage then traverses the baseboardl The until towards its left-hand limit of movement the-trip bolt 116 strikes the reversing switch 112 and the trip bolt 120 opens the switch 114. Upon subsequent closure of the remote control switch 124, the carriage traverses the baseboard in the opposite direction due to the current supply to the motor having been reversed by the prior actuation of the switch- 112:* The same sequence of operations is repeated during subsequent operation of the machine. It may beV seen that the carriage `may be made to traverse the baseboard and return toits initial position by eliminating the trip bolt 120.

Having `thus described the invention, what is claimed as new and is desired to be protected by Letters Patent A trimmer comprising a baseboard having a cutting edge, uprights xed to said baseboard on either side thereof, a` single transom supported on said uprights in parallelism with said cutting edge, -a carriage movably supported by said transom and having sides extendingA below said transom, a rack xed to the `bottom of'said transom between said sides, a rst shaft positioned below said rack and journalled insaid sides of the carriage, a first gear mounted on said first shaft in mesh with said' rack, a second shaft positioned below said rack and journalled in said sides of the carriage, a second gear mounted on said second shaft in mesh with said rst gear, a cutting blade mounted on said second shaft in cutting association with said cutting edge, a reversible motor mounted on said carriage, means drivingly connecting said motor and one of said shafts, and cooperating means carried by said carriage and said transom, respectively, in positions for coacting engagement responsive to movement of vthe cari riage along the transom for reversing said motor and theY movement of the carriage.

References Cited in the le of this patent UNITED STATES PATENTS

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