US2317760A - Printing scale - Google Patents

Description

April 27, 1943,

A. HAN

PRINTING SCALE Filed March 6, 1939 2 Sheets-Sheet l FIGJ.

L i* f a f@ 7 @if my April 27, 1943. A. HAHN 2,317,760

PRINTING SCALE Filed March G, 1959 Sheets-Sheet 2 //7 Ven fam @www-i;

Patented Apr. 27, 1943 PRDITING SCALE Arthur Hahn, Balingen, Germany; vested in the Alien Property Custodian Application March 6, 1939, Serial No. 260,243 In Germany March 9, 1938 4 Claims.

The invention relates to a printing device for adjusting weight inclination weighing machines, in which the values of the weights to be placed on by the weigher after the normal weighing range is exceeded are recorded with the weight values of the normal range of the machine, which are determined by exploration of a disc bearing devices to be explored, rotatable about an axis with the tilting weight device.

The known devices of this kind have the disadvantage that if too large or too small an adjusting weight is placed on, i. e. if the feeler or explorer for the disc is within the dead angle between the limits of zero and the maximum load, either the figure 0 or the figure corresponding to the maximum value of the disc is printed. There are no means for ensuring that the adjusting weights are placed on or taken off in the correct amount, and are taken into account in the printing.

The object of the invention is to remove this disadvantage. This is effected according to the invention, in a weighing machine of the kind above referred to, by the provision of a locking device for the driving means of the printing mechanism, which device comes into operation -if the disc is brought outside the exploring position or range as a result of too large or too small an adjusting weight being added. The locking device is preferably under the control of the disc.

On the disc there is preferably provided, in the angle between the devices for zero and maximum value, a raised or projecting part which when the disc is out of exploring position as the result oi' too large or too small an adjusting weight being added, lies in the path of a feeler moved by the driving means of the printing device, complete movement oi'V which ieeler is necessary for releasing the normally locked driving means for the printing device.

According to a further feature of the invention the feeler moved by the driving means of the printing mechanism serves to control a locking pawl, which engages with play in the said driving means, and is lifted out of the driving means if the feeler executes a full operative movement, but remains in engagement with the driving means if the raised or projecting part on the disc prevents the complete movement of the feeler.

The movement of the feeler co-operating with the raised part of the disc is effected by the driving means of the printing mechanism preferably through the medium of a spring, and the locking pawl engaging in the driving means of the printing mechanism is under the control of a spring normally holding 1t in engagement with the driving means, and of a linkage controlled by the feeler, the spring tending at the same time to draw the feeler into its rest position.

An embodiment of the invention is illustrated by Way of example in the accompanying drawings, in which Figure 1 shows the measuring head of an inclination adjusting weight weighing machine in elevation, with part of the scale removed.

Figure 2 is a plan view of the printing device of the weighing machine,

Figure 3 is a section through the printing device on the line III-III of Figure 2,

Figure 4 is a section through the printing device on the line IV-IV oi Figure 3.

On the axle I of the inclination system of the Weighing machine, which system is known in itself, and is consequently not illustrated in detail, are rigidly mounted an indicator 3 movable over a scale 2, and the disc 4 bearing devices to be explored. This disc is provided with devices to be explored in a. manner likewise known per se. In the embodiment illustrated by way of example the disc has devices for hundreds, tens, and units- The devices for the hundreds consists of steps 5 formed at the periphery of the disc. The devices for the tens are formed by the step-wise onset outer edge 6 of a number of recesses 1 corresponding to the hundreds devices, and the units devices are formed by the step-wise offset inner edge 8 of these recesses.

The exploration of the devices 5, S, 8 is eiected in the axial direction of the disc I by three stepwise offset feelers 9, I0 and II (Figure 2). 'I'he feeler 9 serves for exploring the hundreds devices, the feeler I0 for exploring the tens devices, and the feeler II for exploring the units devices. Each feeler carries at its rear end an eye I2 to which is secured the one end of a spring I3, the other end of which engages a transverse rod I4 of the fixed frame I5 of the printing device, the springs tending to draw the feelers towards the disc Each feeler carries on its under side a projection I6. The projections I6 abut against a transverse rod Il of a slide I8 movable in the direction of the feeler movement. The slide is constructed, on its under-side, as a rack I9, which is in engagement with a gear-Wheel 20. See Figures 3 and 4. The gear-wheel 20 is mounted on the axle 2|, which carries a second gear-wheel 22, which is in engagement with a gear-wheel 25 on the shaft 23 of the hand crank If the hand crank is rotated in the direction of the arrow Figure 3) then the gearwheel4 29 moves the slide i8 and therewith the transverse rod |1 in the direction of the disc 4, so that the feelers 9, I0, Il are released and likewise move 'towards the disc under the iniiuence of the springs 3 and can register with the devices 5, 6, 8 located before them at the time.

The feelers |D and |I transmit their exploring movement directly to the type wheels 26, 21. See Figures 2 and 3. For this purpose the feelers IIJ and are constructed at their rear ends as racks 28, 29, which are in engagement with gear- Wheels 30, 3| on the shafts of the type wheels 26, 21. The printing type wheels are displaced in accordance with the magnitude of the exploring movement of the feelers I0, Il which move inthe "direction of the disc 4 until one of their steps strikes a step of the disc.

TheV exploring movement of theqfeeler 9 for the hundredsis transmitted to the printing type wheel-32,which moreover is pre-adjustable to deiinitewvalues `in accordance with the adjusting weights added. The rack 33 serving for adjustment `of the printing type wheel 32, which device is hingedabell crank lever 36 to which the adjusting weights are coupled by means of the rod 31. YAccordingto the value of the adjusting weight, the bell crank lever 36 presses the rack 33 towards 'the right in Figures 2 and 3 through the intermediary of roller 38; and thereby eiects a preadjustment vof the-printing type wheel 32 in accordance with the adjusting weight which has vbeen added.v v v Thefeeler 9 has a lateral projection 3,9, .and

on the upper side of the rack 33 thereare provided in the vicinity of this projection a number of projections 40, 4|, 42 which upon move-l ment of the feeler 9 towards the disc 4 extendy into the path of the projection 39.

It should be understood that when the weighing machine is operating without additional -weights the projection 39 lies between the projections 4| and 42. When only one additional Weight is used the projection lies between the projections 4| and 42, and when two additional weights are used the position of the projections 40, 4| and 42 relative to the projection 39 is that which is illustrated in Figure 2. The particular means for effectingV relative movement between the elements-39, 4U, 4| and 42 so as to place them in the relative positions stated according to the number of weights used is not illustrated in detail or claimed herein, this mechanism per se being covered in detail .in my copending application for U. S. Letters Patent, Serial NumberA 308,277.

When the feelers 9, l0 and are released in the manner hereinbefore described by the hand crank 24, said feelers move toward the disk 4, the feeler 9 being moved by the lateral projection 39 and taking with it the rack 33. Movement of the rack 33 serves to properly place the printing type wheel 32.

After adjustment of the printing type wheels eiected by pressing a piece of paper or the like lying on the printing plate 43 against the printing type wheels. The printing plate 43 is arranged on the one end of a double-armed pressure stirrup 45 rotatably mounted at 44, which stirrup is controlled by a cam 46. This cam is mounted on a shaft 41 which carries a gear wheel 48 which is in engagement with the gear wheel 25 on the shaft 23 of the hand crank. Upon rotation of the hand crank 24 in the direction of the arrow the cam 46 presses on the end of the pressure stirrup 45, which is provided with a roller 49, and presses the printing plate 43 against the printing type Wheels.

The object of the invention is to prevent printing if the dead angle a: of the disc 4, which corresponds to the dead angle y of the scale 2, is located opposite the feelers 9, l0, Il. In order to achieve this the printing device is held locked when the disc is in this position. The locking is effected by a locking pawl 50 which is mounted on the hand crank shaft 23 and is freely rotatable thereon, the pawl being normally held in engagement with a double cam 52 on the shaft 41, by a spring 5|. The double cam is provided with two recesses 53 and 54. The free end of the locking pawl 50 lies in the recess 53 extending over a certain part of the periphery of the cam. In the recess 54 lies a spring 55 which extends through an opening of the frame of the printing device, and is secured to an angle feeler 51 pivoted at 55. The feeler is connected at its upper end by a rod 58 with one end of the spring 5|, the other end of which is anchored to the frame of the printing device. The rear end of the locking pawl 50 is pivoted to the rod 58 at 59.

If the hand crank 24 is rotated in the direction of the arrow, the free end of the locking pawl 50 slides along in the recess 53 of the double cam 52. At the same time the double cam presses the'spring 55 out of the recess 54 and therewith swings the angle feeler 51 in the direction of the disc 4. By this displacement of the feeler 51 the locking pawl 5U is moved out of the recess 53 of the double cam 52 by the rod 58, so that In order'to prevent printing if the dead angle-1 :c of the disc is Aloca-ted opposite the feel'ers 9, IIJ,

|I a raised part 60 is provided on the disc 4 over this angle, which part lies in front ofthe angle feeler 51 with the disc in the said position. If, with the disc in this position, the hand crank 24 is rotated, the free end of the angle feele'r 51 abuts against the raised part 60. The raised part therefore prevents the full deflection of the angle feeler, the result of which is that the locking pawl 5|) 'is not lifted out of the recess 53 of the double cam 52 by the rod 5B, but remains in engagement with the recess and prevents a further rotation of the hand crank 24.

The raised part 60, the extent of which corresponds to the dead angle of the disc, thus prevents the accomplishment of a printing operation so long as the dead angle of the disc lies opposite the feelers 9, i0 and as the result of excessive or insuicient load. In order to permit of printing, the weigher is obliged to add or remove an adjusting weight according to the circumstances; since it is only by the removal or addition of an adjusting weight that the dead angle of the disc is moved into a position in which the raised part 60 does not lie in frontv of the feelers 9, I0, 'I'he printing of false weighing results by means of the printing mechanism is thereby prevented.

I claim:

l. In a printing scale of the type wherein the value of the weight which is added after the normal weighing range is exceeded, is printed together with the other weight values which are determined by the feeler exploration of a rotatable member formed with weight value indicia corresponding to the normal weight values up to a dead angle between the zero point and the maximum load point; the provision of a printing mechanism for printing the weight of the mass being weighed, driving means for the printing mechanism, a feeler device associated with said driving means, and means providing a control area associated with the rotatable member of the weighing system and extending over the dead angle range and with which the feeler device cooperates for locking the driving means of the printing mechanism, and said feeler device being operable to release the driving means of the printing mechanism when the area on the movable part of the weighing system is out of the range of the said feeler device.

2. In a printing scale of the type wherein the value of the Weight which is added after the normal weighing range is exceeded is printed, together with the other weight values which are determined by the feeler exploration of a rotatable disc formed with weight value indicia. corresponding to the normal weight values up to dead angle between the Zero point and the ma;- imum load point; the provision of a printing mechanism for printing the weight of the macs being weighed, driving means for the printing mechanism, a ieeler device associated with said driving means, and means providing a raised portion on the surface of said disc over the dead angle range and against which the feeler de e is adapted to abut for locking the driving me(- s of the printing mechanism, and said feeler device being operable to release the driving means of the printing mechanism when the said 'i portion is out of the range of said feeler d 3. In a printing' scale, as claimed in claim l,

eviee.

wherein a control lever for the driving means o the printing mechanism simultaneously sei-v .rs the control lever for the feeler device which eifects locking of the printing mechanism.

4. In a printing scale, as claimed in claim i, wherein a locking pawl engages the d means of the printing mechanism to lock the same and wherein spring means are provided for normally forcing said pawl into engagement with the driving means but releasable there ern by operation of the feeler device when the con-- trol area on the movable part of the weighing system is out of range of the feeler device.

ARTHUR HAHN.

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