Patent GB-191512485-A (GB)
Title: Improvements in Devices for Sharpening the Rotary Circular Knives of Slicing Machines.
Inventor: BERKEL WILHELMUS ADRIANUS VAN
IPC: B24B3/46
Filed: 1915-08-31
Abstract: 12,485. Berkel, W. A. Van. Aug. 31. Machine cutters, sharpening in situ.-A device for sharpening the rotary knives of slicing-machines, of the kind having two grinding-elements adapted to operate on the opposite sides of the blade and to be moved into and out of contact with the blade, is provided with means whereby the elements are locked when out of the working position, so that unauthorized persons playing with the adjusting- handle cannot move the elements against each other and damage them, and also with means whereby the elements are positively held, when in the sharpening position, to prevent lifting. The grinding-elements b, c are mounted on spindles rotatable in slidable sleeves f, g, and have springs for pressing them against the knife ; the elements are adapted to be moved into and out of engagement with the knife a by means of a lever 1 fulcrumed on a vertical support e carried by the machine. The lever has a slot 2 in one arm thereof and an opening 3 and a jaw 4 in the other arm ; the slot engages a pin 13 on the sleeve f, and the jaw is adapted to act on a pin 14 on the sleeve g. A gravity catch 15 is pivoted below the lever and is adapted to catch on a tongue portion 18 bent down from the lever to form the aperture 3, and may be disengaged therefrom by pressure on the bar 16 of the catch. The lever has also a projection 5 thereon adapted to bear against a plate spring 6 secured to the casting 8 carrying the slidable sleeves, and a pin 9 is secured to the spring and passes through a hole in the casting 8 and, on movement of the projection 5, into a hole in the support l. At the upper end of the support is pivoted a spring-pressed catch 10 with a handle 12; this catch normally engages the cover k<1> of the casing k of the device. A curved rack-bar 19 is carried by the casing and has teeth 20, 21 thereon adapted to be engaged by a spring catch 22 on the lever 1. The casting 8 has a pin 27 secured thereto adapted to engage with either an opening 28 or a depression 29 in a plate 30 secured to the support, and the device may slide and turn on the support. When in the lowered position for sharpening, the casting 8 rests on the plate with the pin engaging in the opening, thereby preventing turning of the device, and the catch 10, engaging the cover, prevents lifting. With the catch 22 on the lever engaging the tooth 21 of the rack-bar, both elements are out of contact with the knife, and the pin 9 is out of engagement with the hole in the support ; by movement of the lever so that the catch engages the tooth 20, the element c is allowed to come, with spring pressure, into contact with the back of the knife, and by movement of the lever to the extreme right-hand position, both elements are allowed to come into contact with the knife under spring pressure. In these positions, with the elements in contact with the knife, the pin 9 engages in the hole in the support and positively holds the device in the lowered position, even if the catch 10 is moved ; when, however, the elements are out of contact with the blade, the pin 9 is free of the hole and the device may be raised, and when it has been raised so that the pin 27 clears the opening, it may be turned so that the pin engages the depression 29 in the plate 30. In this position, the catch 15 engages the tongue 18 on the lever and prevents movement of this ; the tongue is freed by contact of the plate with the bar 16 when the device is lowered after being turned. Screws 31, 32 in the plate enable the angle of the elements to the knife to be varied to a slight extent, limited, however, by the play of the pin 9 in the hole in the support.