US3864553A - Resetting device for counter drums - Google Patents

Abstract

A reset device for resetting the digit drums of a counter wherein the digit drums are couplable by transfer pinions mounted on a common pinion shaft movable to and from a position in which the transfer pinions are in engagement with the digit drums, the reset device comprising a reset slide having first and second blades defining a notch open at one end and in which the pinion shaft is engageable, the slide being movable to progressively engage the shaft in the notch, the notch having a first part in which the shaft is engaged during a first phase of actuation of the slide to move the transfer pinions out of engagement with the digit drum, a second part in which the shaft is engaged during a second phase of actuation of the slide to maintain the transfer pinions in the out-of-engagement position, and a third part in which the shaft is engaged during a final phase of actuation of the slide to move the transfer pinions back into engagement with the digit drums, one of the blades having a guide surface engageable by the shaft to move the blade away from the shaft during the return movement of the reset slide while the transfer pinions are maintained in engagement with the digit drums; reset means coupled to the reset slide and engageable with cam means on the digit drums during the second and final phases of actuation of the reset slide to reset the digit drums and maintain the digit drums in reset positions respectively, and spring means biasing the transfer pinions into engagement with the digit drums.

Description

United States Patent 191 Krauss Feb. 4, 1975 RESETTING DEVICE FOR COUNTER DRUMS [75] Inventor: Hans Giinter Krauss, Vohrum,

Germany [73] Assignee: Elmeg Elektro-Mechanik GrnbH,

Peine, Germany [22] Filed: Apr. 1, 1974 [21] Appl. No.: 456,538

Related US. Application Data [63] Continuation of Serv No. 325,428, Jan. 22, 1973,

abandoned.

[30] Foreign Application Priority Data Jan. 24, 1972 Germany 2203250 [52] US. Cl 235/144 HC [51] Int. Cl. G06c 15/42 [58] Field of Search 235/144 HC, 95 R, 133 R,

[56] References Cited UNITED STATES PATENTS 2,980,329 4/1961 Hoffman .1 235/144 HC 3,053,441 /1962 Vroom 235/144 HC 3,178,111 4/1965 Auer 235/144 HC 3,677,468 7/1972 LaPointe 235/144 HC 3,711,684 1/1973 Zielke t 4 235/144 HC 3,777,973 12/1973 Kundisch 235/144 HC Primary ExaminerRichard B. Wilkinson Assistant Examiner-Vit W. Miska Attorney, Agent, or Firm-Ralf H. Sieaemund [57] ABSTRACT A reset device for resetting the digit drums of a counter wherein the digit drums are couplable by transfer pinions mounted on a common pinion shaft movable to and from a position in which the transfer pinions are in engagement with the digit drums, the reset device comprising a reset slide having first and second blades defining a notch open at one end and in which the pinion shaft is engageable, the slide being movable to progressively engage the shaft in the notch, the notch having a first part in which the shaft is engaged during a first phase of actuation of the slide to move the transfer pinions out of engagement with the digit drum, a second part in which the shaft is engaged during a second phase of actuation of the slide to maintain the transfer pinions in the out-ofengagement position, and a third part in which the shaft is engaged during a final phase of actuation of the slide to move the transfer pinions back into engagement with the digit drums, one of the blades having a guide surface engageable by the shaft to move the blade away from the shaft during the return movement of the reset slide while the transfer pinions are maintained in engagement with the digit drums; reset means coupled to the reset slide and engageable with cam means on the digit drums during the second and final phases of actuation of the reset slide to reset the digit drums and maintain the digit drums in reset positions respectively, and spring means biasing the transfer pinions into engagement with the digit drums.

10 Claims, 2 Drawing Figures RESE'ITING DEVICE FOR COUNTER DRUMS This is a continuation of application Ser. No. 325,428 filed .Ian. 22, 1973, now abandoned.

The present invention relates to a reset device for resetting the digit drums of a counter.

In resettable counters having transfer pinions coupling the digit-drums, the transfer pinions which serve to notch the digit drum of the next higher order for wards one step each time the preceding digit drum has completed one revolution are during the resetting process, moved out of engagement with the digit drums, since the latter must be able to rotate freely during the engagement of reset fingers with the heart-shaped cams coupled to the digit drums.

ln known counters of this type the action of the reset fingers on the heart-shaped cams and the disconnection of the transfer pinions are coordinated so that the pinions are moved out of engagement with the digit drums before the reset fingers begin to act on the heat-shaped cams, and the transfer pinions are moved back into engagement with the digit drums before the reset fingers are disengaged from the sections of the heart-shaped cams corresponding with the zero position of the digit drums. This time cycle is such that the digit drums do not receive a torque from the resetting fingers before the transfer pinions have been disengaged therefrom; otherwise the drums can be jammed or damaged. Furthermore after the digit drums have been set to zero they are not freely rotatable before their reengagement by the transfer pinions and hence movable under the effects of vibration or the like. This time cycle (disengagement of the transfer pinions, action of the reset fingers on the heabshaped cams to bring the digit drums to zero, securing of the digit drums in their zero position by the reset fingers, re-engagement of the transfer pinions and movement of the reset fingers back to their rest position) is carried out relatively satisfactorily by known reset devices. However, in known reset devices to attain the above cycle a multiplicity of components requiring exact adjustment is however necessary, whereby the material costs and expense of assembly of the reset device are very unfavourably affected. It is consequently the object of the present invention to produce a reset device in which by cutting down the components necessary the material and assembly costs can be considerably lowered.

In a known type of counter a reset slide guided in a sideplate is provided, which can be actuated either by hand or electromagnetically. On this reset slide an arm is rotatably supported, the arm being solidly connected to a reset cam supported pivotally on a spindle and carrying the reset fingers. A pinion bridge carrying the transfer pinions is also supported on this spindle, and a friction coupling is provided between the reset cam and the pinion bridge. When the reset slide is actuated both the pinion bridge and the reset cam swing round simultaneously. The pinion bridge is thereby brought out of engagement with the drums before the reset fingers have contacted the heart-shaped cams on the digit drums. After the pinion bridge has swung out it resets against a stop so that with further movement of the reset slide the reset fingers can act on the heart-shaped earns, as the reset cam pivots relative to the pinion bridge. By virtue of the friction between the pinion bridge and the reset cam, during the return movement of the reset slide effected by a spring, the pinion bridge comes into engagement with the digit drums before the reset fingers are swung away out of the indentations in the heart-shaped cams corresponding with the zero positions. After the reengagement of the transfer pinions with the digit drums, the reset cam again swings round relative to the pinion bridge so that the reset fingers leave the indentations in the heart-shaped cams. This device necessitates a pinion bridge for the transfer pinions, a reset cam, a friction coupling having a spring and an arm for transmitting the movement of the reset slide to the reset cam. All these parts must, during the assembly of the counter in its housing, be inserted in the correct order.

Another known counter is similarly constructed and also has a friction coupling between its reset cam and the pinion bridge carrying the transfer pinions. In this counter, however, the shaft common to all the transfer pinions is supported not only in the pinion bridge but also in slots extending in the direction of movement of the reset slide. These slots serve exclusively to provide additional guidance for the shaft of the transfer pinions. This counter has the same disadvanrage as that described above.

In an improved counter departing from the two counters described above and known from German Pat. No. l,l43,348, the reset cam has a striker lying between two stops on the reset slide, by which the reset cam can be pivoted. The pinion bridge supported on the same shaft as the reset cam is coupled with the reset slide via an operating spring which bears on the shaft of the transfer pinions and the striker. This spring also serves as a toggle spring for the striker. In this counter, upon actuating the reset slide, the pinion bridge is first of all swung over because of the operating spring connection. Next the striker comes into engagement with one stop on the reset slide, so that the reset cam swings over and hence the digit drums are brought into the zero position. In this position the reset cam is held by the spring acting on the striker, so on the return of the reset slide the transfer pinions first of all swing back again and then, by the action of the other stop on the striker, the reset cam is returned to its starting position. This reset device also requires a multiplicity of costincreasing components.

In another known counter a reset cam and a pinion bridge are supported on a common shaft, the pinion bridge and the reset cam being urged together by a spring. On the reset slide of this counter two stops are provided, one of which urges the pinion bridge in the direction of the digit drums when the reset slide is not being actuated, whilst the other, when the reset slide is actuated, acts directly on the reset cam. When the reset slide is actuated both the reset cam and the pinion bridge are swung across because of the spring. In this case the paths of swing are so proportioned that the transfer pinions come out of engagement before the reset fingers can act upon the heart-shaped cams. When the digit drums are brought into the zero position by the action of the reset fingers on the heart-shaped earns, the reset fingers in this position drop into indentations in the heart-shaped cams. In this condition the reset cam is locked by a spring-loaded blocking-lever. This lever is raised by the reset slide as it returns. when the transfer pinions have come into re-engagement with the digit drums. This reset device also suffers from the same disadvantage of a heavy outlay affecting the total price of the counter considerably.

in summary it can be said of the known reset devices that they all exhibit the same disadvantage of requiring many components which are difficult to assemble, and that in all of them the outward swing of the pinion bridge is not positively coupled with the movement of the reset slide. Because of this it cannot be guaranteed that the transfer pinions will be disconnected at the right instant and before the reset fingers act on the heart-shaped cams, so that. in the case ofjerky actuation of the reset slide, as occurs, for example, with electromagnetic actuation, it may be that no reset will occur after all and/or that the transfer pinions and digit drums are damaged.

According to the present invention, there is provided a reset device for resetting the digit drums of a counter wherein the digit drums are couplable by transfer pinions carried on a common shaft which is movable to disconnect the transfer pinions from digit drums during the return reset movement of the digit drums, the device comprising a reset slide defining a notch in which the pinion shaft is engaged for displacement of the pinion shaft, the notch having a first part aligned so that, in a first phase of actuation of the reset slide, the pinion shaft is engaged therein and the transfer pinions are moved out of engagement with the digit drums, a second part so aligned that, in a second phase of actuation of the reset slide, the pinion shaft is engaged therein and the out-of-engagement position of the transfer pinions is maintained so that the digit drums can be reset while disengaged from the transfer pinions, and a third part so aligned that in a final phase of the actuation of the reset slide the pinion shaft is engaged therein and the transfer pinions are moved back into engagement with the digit drums while the reset position of the digit drums is maintained, said reset slide being adapted such that it can be moved back to its starting position without alteration of the reset position of the digit drums.

In an embodiment of the reset device it is of no particular importance of which kind are the reset members effecting the resetting of the digit drums and provided between the reset slide and the digit drums. With any kind of reset member a strict separation of the individual motions of the pinion shaft into motions occurring positively one after the other is attained. Above all with this device a large number of hitherto necessary components disappear, as for example a separate pinion, friction coupling or toggle spring. A particularly simple device in which the need for a reset bridge disappears includes reset fingers which act on heartshaped cams provided on the digit drums and which are mounted on the reset slide. in this device only a single component is required for the resetting of the digit drums and the disconnection of the transfer pinions, namely, the reset slide.

A deflection spring may be provided on the reset slide, extending in the direction of actuation of the latter, which forces the pinion shaft in the direction towards the digit drums. Hereby a separate spring and its manufacture and assembly are saved since the deflection spring simply in the form, for example, ofa spring wire can be moulded into a reset slide of injectionmoulded synthetic and thus made together with the latter.

The notch may be open at one end such that the reset slide can be inserted in the device in a very simple manner even with the pinion shaft already in place.

In a preferred embodiment of the invention in which part of the notch is defined by an upper blade. the blade is provided with an oblique abutment surface and engaged by the pinion shaft on the return movement of the reset slide. to swing the blade resiliently outwardly in the longitudinal direction of the shaft. The reset slide may be mounted for movement in a lengthwise guide provided in the counter housing. The upper blade is then swung out during the return movement of the reset slide, so that the pinion shaft can once again return to the first part of the notch corresponding with the starting position.

The reset slide may be formed with a ridge which in the initial position of the reset slide contacts the pinion shaft on that side away from the digit drums. The transfer pinions are thus prevented during a counting cycle from being able to be swung out of engagement with the digit drums by vibration or the like.

An embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

FIG. 1 is a diagrammatic side elevation of the main components of a preferred embodiment of a device in accordance with the invention, and

FIG. 2 is a diagrammatic plan view of the embodiment of FIG. 1, in which two operative positions of the apparatus are shown.

In FIGS. l and 2 a shaft 3 common to all digit drums 2 is supported in a counter housing I. The digit drums 2 are operatively coupled together by transfer pinions 4; the transfer pinions 4 are supported on a pinion shaft 5 common to all the pinions and mounted in slots 6 provided in the housing 1. The pinion shaft 5 is retained axially by locking pieces 20.

In the housing 1 there is also supported a reset slide 7 which is movable lengthwise. A reset finger 8 for each digit drum 2 is mounted on slide 7. These reset fingers 8 are operative to reset the digit drums 2 by action on heart-shaped cams 9 provided on each digit drum 2.

At each arm of the U-shaped reset slide which cooperates with the pinion shaft 5, a notch 10 is provided between an upper laterally resiliently swingable blade 11 and a lower rigid blade 19. A deflection spring 12 connected with the reset slide extends in each notch. The spring 12 urges the pinion shaft 5 continuously in the direction of the digit drums 2 to urge the pinions into engagement with the drums (FIG. 1). The notches 10 each comprise three parts l3, l4 and 15, which are arranged at angles to one another. The notches l0 serve to engage the pinion shaft 5 of the transfer pinions, when the reset slide is slid forwards (i.e., in the right hand direction of FlGS. l and 2), to move the shaft 5 in the slots 6 in the housing 1 against the springs 12 to a position in which the pinions are out of engagement with the drums.

An abutment surface 16 is formed on each of the upper blades 11 of the reset slide 7 and cooperates with the rounded ends 17 of the pinion shaft 5 in the appropriate position of the reset slide 7 so causing the upper blade 11 to be swung outwards (lower part of FIG. 2).

The operation of the above described apparatus is as follows. When the reset slide 7 is operated, i.e., is moved towards the right, initially the transfer pinions 4 are moved out of engagement with the digit drums 2, because the first part 13 of the notches 10 causes the pinion shaft 5 to move from its end position in the slots 6. During the second phase of the reset movement of the slide the pinion shaft 5 moves into the second part 14 of the notch whereby the shaft is firmly held in its out-of-engagement position and at the same time the reset fingers 8 act upon the heart-shaped cams 9 so that during this phase of the reset movement the digit drums 2 are turned back to their starting positions. in the last phase of the reset movement the pinion shaft 5 is guided into the third part of the notch 10, thereupon the pinion shaft 5, under the urging of the deflection springs 12, moves back along the slots 6, and the pinions 4 come into engagement with the digit drums, which have been reset in the meantime, before the digit drums are released by the reset fingers. During the return movement of the reset slide 7, i.e., its movement to the left of FIG. 1, the rounded ends 17 of the pinion shaft 5 first engage the surfaces 16 on the upper blades 11 of the reset slides 7. With further movement of the reset slide 7, the upper blades II are swung outwards by the rounded ends 17 of the pinion shaft 5 without this leaving its position at the ends of the slots 6 with the pinions in engagement with the drums. When the slide 7 has completely withdrawn, the pinion shaft 5 lies once more in the first part 13 of the notches 10. These parts 13 are open on one side. A ridge i8 is provided on the lower blade 19 which, when the slide is in its inoperative position, engages the pinion shaft 5 from underneath and prevents the transfer pinions from being able to be swung away from engagement with the drums during a counting process on account of vibrations or the like.

It is to be understood that the invention is not limited to the embodiment shown. Thus the reset slide can, for example, instead of being U'shaped consist of only one linear part and therefore have only one notch. Obviously it is possible, instead of the reset fingers 8 provided on the reset slide, to provide other means arranged between the reset slide 7 and the digit drums 2 for resetting the digit drums 2. Such other means are so arranged and aligned that the resetting of the digit drums 2 takes place exclusively during the second phase of the reset actuation of the reset slide 7, that is, during the time when the pinion shaft Sis guided in the second part 14 of the notch 10.

Instead of the deflection spring 12 another kind of spring, urging the pinion shaft 5 in the direction of the digit drums, can also be provided. Finally the upper blade 11 of the reset slide can be rigid. In this case the reset slide can instead be swingable so that in its return movement it swings upwards so that the pinion shaft can again reach the front, first part 13 of the notch 10.

I claim:

1. in a reset device for resetting the digit drums of a counter wherein the digit drums are couplable by transfer pinions carried on a common shaft, which is movable to disconnect the transfer pinions from digit drums during the return movement of the digit drums the device having means for resetting the digit drums upon advance of a reset slide and holding the digit drums in the reset position unitl the reset slide is being retracted, the improvement ofa control member connected to the reset slideand having a particularly contoured cam surface, in which the pinion shaft is engaged for displacement of the pinion shaft, the cam surface of the control member having a first cam surface aligned, so that, in a first phase of actuation and advance of the reset slide, the pinion shaft is engaged therein and the transfer pinions are moved out of engagement with the digit drums;

a second cam surface continuing the first cam surface but in a different direction, so that, in a second phase of continued and advance actuation of the reset slide, the pinion shaft as engaged therewith causing the outof-engagement position of the transfer pinions to be maintained, so that the digit drums can be reset by the means for resetting while remaining disengaged from the transfer pinions; and a third cam surface continuing the second surface, again in a different direction, so that in a final phase of the still continued actuation and advance of the reset slide the pinion shaft as engaged therewith is displaced, so that the transfer pinions are moved back and into engagement with the digit drums. while the reset position of the digit drums is actively maintained by the means for resetting, said member and said shaft constructed for relative displacement transverse to the movement of the shaft by operation of the first and third cam surfaces, so that as said reset slide is being moved back to its starting position. the third and second cam surface bypass said pinion shaft and the reset position of the digit drums is not being altered as the reset slide moves back.

2. A reset device as claimed in claim 1, including reset fingers adapted to act on heart-shaped cams provided on the digit drums and mounted on said reset slide.

3. A reset device as claimed in claim I, including a deflection spring provided on said reset slide, extending in the direction of actuation of said slide and urging the pinion shaft in a direction to urge the transfer pinions into engagement with the digit drums.

4. A reset device as claimed in claim I, said control member having a blade which is formed with an oblique abutment surface engageable by the pinion shaft on the return movement of said reset slide to swing said blade resiliently outwardly away from the shaft.

5. A reset device as claimed in claim 4, said control member having a second blade which is provided with a ridge which, in the starting position of the reset slide. contacts the pinion shaft on that side remote from the digit drums.

6. A reset device for resetting the digit drums of a counter, wherein the digit drums are releasably engaged with transfer pinions carried on a common shaft. which is journalled to shift in-between first and second positions respectively of engagement of the digit drums with the pinions, and of disengagement of the digit drums from the pinions, and wherein the digit drums are operable through particular cam surfaces for returning the digit drums to a zero position, the device further including a reset slide with reset means normally disengaged from said particular cam surfaces but respectively engaging the particular cam surfaces for returning the digit drums to a zero position upon advancing of the reset slide, the improvement comprising:

a multi-surface control member connected to the reset slide and moving therewith and having first, second and third camlike control surfaces for sequential engagement with said pinion shaft upon advancing the reset slide in one particular direction, the first, second and third control surfaces having different directions, so that, upon displacement of the control member, the pinion shaft is guided into different dispositions;

the first control surface oriented for displacing the shaft, upon initially advancing of the reset slide, from the first to the second position, the second control surface engaging the shaft upon continued advancing of the reset slide and retaining the shaft in the second position. the third control surface engaging the shaft and becoming operative during the last phase of continued reset slide advancing, permitting the shaft to return to the first position. wherein the pinions engage the digit drums;

first means for causing the shaft to engage the third control surface for obtaining return of the shaft to the first position in the last phase of advance of the reset slide, the reset means as engaging the cam surfaces for returning the digit drums to zero position during advance of the reset slide, prior to return of the shaft to the first position, additionally holding the digit drums through the cam surfaces until retraction of the reset slide; and

second means for defining a fourth control surface to guide the relative disposition of the member and of the shaft upon the reset slide being returned. so that the second and third control surfaces remain disengaged from the shaft during the return of the reset slide, and the shaft remains in the first positron.

7. A reset device as in claim 6, wherein the portion of the control member having the first, second and third cam surfaces. is resiliently deflectible. and has the fourth cam surface coacting in control with an end of the shaft for being deflected upon retraction of the slide.

8. A reset device as in claim 7, said control member having a guide slot for the shaft, the first. second and third cam surfaces bounding and defining one side of the slot, the first means including spring means on the member for retaining the shaft in engagement with the first second and third cam surfaces.

9. A reset device as in claim 6, the first means being a spring. urging the shaft into engagement with the second and third cam surfaces, the third surface being recessed in relation to the second surface, so that the spring upon urging the shaft into engagement with the third cam surface moves the shaft to the first position.

10. A reset device as in claim 6, the spring retaining the shaft in the first position upon retraction of the slide.

Claims (10)

1. In a reset device for resetting the digit drums of a counter wherein the digit drums are couplable by transfer pinions carried on a common shaft, which is movable to disconnect the transfer pinions from digit drums during the return movement of the digit drums the device having means for resetting the digit drums upon advance of a reset slide and holding the digit drums in the reset position unitl the reset slide is being retracted, the improvement of a control member connected to the reset slide and having a particularly contoured cam surface, in which the pinion shaft is engaged for displacement of the pinion shaft, the cam surface of the control member having a first cam surface aligned, so that, in a first phase of actuation and advance of the reset slide, the pinion shaft is engaged therein and the transfer pinions are moved out of engagement with the digit drums; a second cam surface continuing the first cam surface but in a different direction, so that, in a second phase of continued and advance actuation of the reset slide, the pinion shaft as engaged thErewith causing the out-of-engagement position of the transfer pinions to be maintained, so that the digit drums can be reset by the means for resetting while remaining disengaged from the transfer pinions; and a third cam surface continuing the second surface, again in a different direction, so that in a final phase of the still continued actuation and advance of the reset slide the pinion shaft as engaged therewith is displaced, so that the transfer pinions are moved back and into engagement with the digit drums, while the reset position of the digit drums is actively maintained by the means for resetting, said member and said shaft constructed for relative displacement transverse to the movement of the shaft by operation of the first and third cam surfaces, so that as said reset slide is being moved back to its starting position, the third and second cam surface bypass said pinion shaft and the reset position of the digit drums is not being altered as the reset slide moves back.

2. A reset device as claimed in claim 1, including reset fingers adapted to act on heart-shaped cams provided on the digit drums and mounted on said reset slide.

3. A reset device as claimed in claim 1, including a deflection spring provided on said reset slide, extending in the direction of actuation of said slide and urging the pinion shaft in a direction to urge the transfer pinions into engagement with the digit drums.

4. A reset device as claimed in claim 1, said control member having a blade which is formed with an oblique abutment surface engageable by the pinion shaft on the return movement of said reset slide to swing said blade resiliently outwardly away from the shaft.

5. A reset device as claimed in claim 4, said control member having a second blade which is provided with a ridge which, in the starting position of the reset slide, contacts the pinion shaft on that side remote from the digit drums.

6. A reset device for resetting the digit drums of a counter, wherein the digit drums are releasably engaged with transfer pinions carried on a common shaft, which is journalled to shift in-between first and second positions respectively of engagement of the digit drums with the pinions, and of disengagement of the digit drums from the pinions, and wherein the digit drums are operable through particular cam surfaces for returning the digit drums to a zero position, the device further including a reset slide with reset means normally disengaged from said particular cam surfaces but respectively engaging the particular cam surfaces for returning the digit drums to a zero position upon advancing of the reset slide, the improvement comprising: a multi-surface control member connected to the reset slide and moving therewith and having first, second and third camlike control surfaces for sequential engagement with said pinion shaft upon advancing the reset slide in one particular direction, the first, second and third control surfaces having different directions, so that, upon displacement of the control member, the pinion shaft is guided into different dispositions; the first control surface oriented for displacing the shaft, upon initially advancing of the reset slide, from the first to the second position, the second control surface engaging the shaft upon continued advancing of the reset slide and retaining the shaft in the second position, the third control surface engaging the shaft and becoming operative during the last phase of continued reset slide advancing, permitting the shaft to return to the first position, wherein the pinions engage the digit drums; first means for causing the shaft to engage the third control surface for obtaining return of the shaft to the first position in the last phase of advance of the reset slide, the reset means as engaging the cam surfaces for returning the digit drums to zero position during advance of the reset slide, prior to return of the shaft to the first position, additionally holding the digit drums through the cam surfaCes until retraction of the reset slide; and second means for defining a fourth control surface to guide the relative disposition of the member and of the shaft upon the reset slide being returned, so that the second and third control surfaces remain disengaged from the shaft during the return of the reset slide, and the shaft remains in the first position.

7. A reset device as in claim 6, wherein the portion of the control member having the first, second and third cam surfaces, is resiliently deflectible, and has the fourth cam surface coacting in control with an end of the shaft for being deflected upon retraction of the slide.

8. A reset device as in claim 7, said control member having a guide slot for the shaft, the first, second and third cam surfaces bounding and defining one side of the slot, the first means including spring means on the member for retaining the shaft in engagement with the first second and third cam surfaces.

9. A reset device as in claim 6, the first means being a spring, urging the shaft into engagement with the second and third cam surfaces, the third surface being recessed in relation to the second surface, so that the spring upon urging the shaft into engagement with the third cam surface moves the shaft to the first position.

10. A reset device as in claim 6, the spring retaining the shaft in the first position upon retraction of the slide.

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