Patent GB-644775-A (GB)
Abstract: 644,775. Band saws. HOBART MANUFACTURING CO. Jan. 31, 1947, No. 3016. Convention date, Feb. 20, 1946. [Class 145(ii)] A band saw for food products comprises a base including a housing 11 forming an enclosed space 24, a closure 25 (27) in at least one side of the housing leading to the enclosed space, walls forming a closed compartment 22, (see Fig. 3), separate from the enclosed space and in which compartment is housed the lower band-saw wheel 52 the driving mechanism for which is in the said enclosed space but outside the said compartment 22 ; and a drawer 60 receivable in the closed compartment and withdrawable from outside of the base for collecting and removing material thrown off by the saw and band-  wheel. The drawer 60, slotted at 65 and slideable fitting with the compartment 22 is preferably withdrawable through an opening in the front of the base; and a protective stop 69 may be provided which contacts the end of the drawer when in the dotted line position shown in Fig. 2 to prevent the'latter contacting the wheel, but which slides in the slot 65 on tilting the drawer into the position shown in full lines and co-operates with the slot-end 66 to serve as a latch for the fully closed drawer. In the arrangement shown for sawing meat, an upper head 93 housing the upper band-saw wheel resiliently supported therein and the bearing for which is located in a separate compartment in the head (see Fig. 11, not shown), is carried by a pedestal 70 sliding in guides of a rigid frame 30. The pedestal height and the tension of the sawblade are together adjustable by means of the hand wheel 86 and associated gears housed in the enclosure 24, an indicator, Fig. 12 (not shown), being provided to show the degree of blade tension. The band-saw wheels are readily interchangeable, latch members 55 pivotally mounted on each limb being provided to engage beneath stud heads 56 under the action of spring detents 57 whilst the wheels are in use. The drive is effected by a motor 45 (actuated by a switch control 290) housed in the enclosure 24 and having adjusting means 46 for tensioning the driving belt. The saw-blade is guided and cleaned by the lower device 155, Fig. 14, and is also guided by the upper device 210; the former comprising guide members 185 (fixed) and 186 (pivotally mounted), spring-urged blade wipers 163, roller bearing 174, and rotatable wheel scraper 148 ; the device 210 being adjustable longitudinally of the blade and carrying a pivoted bar 220 (not shown) serving as a saw-guard. The recess 91 in the pedestal 70 may have a three-sided trough member 200 serving to facilitate the delivery of scrapers &c. from the upward moving flight 142 of the blade into the compartment 22. The work table 250, Fig. 27, can be locked in position by a member 258 and carries a gauge plate 300 with fence 301, adjustable along a toothed rack bar 310 and having a lug 330, not shown, cooperating with the said bar to prevent tilting of the gauge plate while this latter is moved across the table until the position of an arcuate slot 333, Fig. 34 (not shown), in the bar bracket is reached, when the gauge plate may be tilted upwardly and moved to the end of the table and if desired,. be removed. The work carriage 252 has rollers 273 moving on flanges 270 and is moved by hand pressure of the operator to carry the work forward and backward, lateral pressure being exerted manually on the work also to urge it against the fence 301. The extent of movement of the carriage is limited by contact of brackets 284,. 285 on its underside with respective abutments 280, 281 on a stop plunger 276 mounted on the knob 279 and projecting through the plate 269, such that pulling downwardly on the said knob withdraws the plunger 276 and allows the carriage to be removed beyond the end of its tracks. In a modification, Fig. 39, in order to withdraw the uncut work laterally from the blade after cutting to prevent their contact on the return motion of the work, the carriage 360 may be mounted on further rollers 358 carried by the frame 355 which in turn moves on rollers 356, not shown. Lateral pressure is exerted on the carriage 360 to maintain the work in contact with the saw blade 361, the amount of lateral movement being limited by the bar 363 secured to the underside of the carriage and having a T-shaped head 364 which may abut against the outer edge of the plate 355. After the carriage has been pushed forwardly to cut the work, the lateral pressure is released thus allowing the spring 378 through the medium of the lever 376 to push the pin 375 (thence the carriage to which the pin is attached, and the work thereon) laterally away from the blade. The carriage is then manually returned longitudinally, the work is pushed against the gauge plate, and the operation repeated. A notched cam member 390 pivoted to the plate 355 and co-operating with a rectangular bar 394 attached to the underside of the carriage, allows the carriage to be set for either the above described motion and in this case also determines the amount of lateral shift away from the blade ; or for ordinary to-and-fro motion without lateral shift ; or for removal; according to the position of the rotatable cam member. The base of the machine may be supported in adjustable feet 13 covered with flexible sleeves 18 of neoprene &c., whilst the leading edges of the saw teeth are preferably rearwardly inclined at an angle of approximately 5 degrees.