Patent GB-681605-A (GB)
Title: Improvements in and relating to means for detinning bread and the like
Inventor: WALKER JOHN MCGREGOR
IPC: A21B3/18
Filed: 1949-09-22
Abstract: 681,605. Bread, extracting from baking tins. BAKER PERKINS, Ltd. Dec. 13, 1950 [Sept. 22, 1949], No. 24346/49. Class 28 (i). [Also in Group XXX] A machine for automatically removing baked loaves from their tins comprises tin-receiving platforms 12 arranged like a vertical paddle wheel 10, the tins being clamped mechanically or held by an electromagnet 13 on the platforms 12 which are vibrated or jolted e.g., by an electric vibrator 15 to loosen the loaves which then fall out on being inverted by the intermittent part-rotation of the wheel after which the tins are released. The loosening may also be done by a single hard knock. In Fig. 2 the electric vibrator 15 repeatedly knocks the platform 12 against a stop 18 while the electromagnet 13 holds the tins on the platform. The loaves in falling out are guided by an apron 24 to fall through a chute 26, the pivoted half bottom 37 of which is automatically turned down to tip the loaf from A into position B where another pivoted bottom 41 tips it in correct position on a conveyer 27. The guide apron 24 and shoot 36 are pivotable about 28 by screw 29 to adjust them to suit the shape or size of loaf being dealt with. The empty tins are released from the platform 12 when they have rotated into position over a discharge shoot 30 where they slide down a slope 31 and rollers 32 to a conveyer 33. The electromagnet 13 may be switched on and off by cams or triggers rotating with the wheel 10 or by an automatic switch actuated by pressure contact of a group of tins when pushed by pusher 35 from conveyer 34 on to the platforms 12. The vibrators 15 may be energized at the correct time in a similar way. The wheel is electrically rotated intermittently for 120 degrees at a time by similar automatic means. A hydraulic or mechanical drive may be used instead (not described). Such step by step drive may be actuated through a ratchet and pawl and a brake may be applied and released at the stopping and starting of the wheel 10. To deal with 1 lb. or 2 lb. loaves the vertical division plates of the wheel 10, the guide apron 24 and the loaf delivering devices are removably mounted for replacement by others. Fig. 4 shows a rotary detent 63 to hit the outer edge of the platform 12<SP>1</SP> a number of times to give the loosening vibration. A single mechanical jolt may be given to the platform 12', Fig. 4, by a spring 60 which is first compressed during rotation when the outer edge of 12' is temporarily held back by the rotary detent which soon releases it whereby the platform 12' is pushed by the now released spring 60 to jolt the platform 12<SP>1</SP> against a fixed stop 61. Alternatively a fixed detent may hold up movement of the platform 12' until further movement causes it to slip off the detent with release and-a single jolt against the stop 61. Instead of the electromagnet 13 of Fig. 2 the tins may be mechanically clamped in position, Figs. 4 and 7, where a grooved endless cam 74 rocks a lever 77 whereby interengaging toothed segments 76, 78 press a grooved arm 73 to engage and hold the curled-over edge of the tin or of a strap 9 which holds a group of tins together. The other edge of the tin is then pressed into a holding hook 79 so that the tin is held during shaking or jolting. The cam 74 releases the tin later after discharge of the loaf. In Fig. 7 the hook 79 is yieldingly pressed towards the tin by springs. The position of the' hook 79 in Fig. 7 can be adjusted to suit 1 or 2 lb. tins. The electromagnetic method of holding the tins may be combined with the mechanical shaking or jolting or the electrical shaking may be used with the mechanical holding.